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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e114e473 CS |
2 | /* |
3 | * Simplified MAC Kernel (smack) security module | |
4 | * | |
5 | * This file contains the smack hook function implementations. | |
6 | * | |
5c6d1125 | 7 | * Authors: |
e114e473 | 8 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 9 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
10 | * |
11 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 12 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 13 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 14 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 15 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
16 | */ |
17 | ||
18 | #include <linux/xattr.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/stat.h> | |
e114e473 CS |
22 | #include <linux/kd.h> |
23 | #include <asm/ioctls.h> | |
07feee8f | 24 | #include <linux/ip.h> |
e114e473 CS |
25 | #include <linux/tcp.h> |
26 | #include <linux/udp.h> | |
c6739443 | 27 | #include <linux/dccp.h> |
d66a8acb | 28 | #include <linux/icmpv6.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
e114e473 | 30 | #include <linux/mutex.h> |
e114e473 | 31 | #include <net/cipso_ipv4.h> |
c6739443 CS |
32 | #include <net/ip.h> |
33 | #include <net/ipv6.h> | |
d20bdda6 | 34 | #include <linux/audit.h> |
1fd7317d | 35 | #include <linux/magic.h> |
2a7dba39 | 36 | #include <linux/dcache.h> |
16014d87 | 37 | #include <linux/personality.h> |
40401530 AV |
38 | #include <linux/msg.h> |
39 | #include <linux/shm.h> | |
bc46ef3c | 40 | #include <uapi/linux/shm.h> |
40401530 | 41 | #include <linux/binfmts.h> |
3bf2789c | 42 | #include <linux/parser.h> |
2febd254 DH |
43 | #include <linux/fs_context.h> |
44 | #include <linux/fs_parser.h> | |
a8478a60 | 45 | #include <linux/watch_queue.h> |
b66509b8 | 46 | #include <linux/io_uring/cmd.h> |
f3b8788c | 47 | #include <uapi/linux/lsm.h> |
e114e473 CS |
48 | #include "smack.h" |
49 | ||
5c6d1125 JS |
50 | #define TRANS_TRUE "TRUE" |
51 | #define TRANS_TRUE_SIZE 4 | |
52 | ||
c6739443 CS |
53 | #define SMK_CONNECTING 0 |
54 | #define SMK_RECEIVING 1 | |
55 | #define SMK_SENDING 2 | |
56 | ||
baed456a RS |
57 | /* |
58 | * Smack uses multiple xattrs. | |
59 | * SMACK64 - for access control, | |
60 | * SMACK64TRANSMUTE - label initialization, | |
61 | * Not saved on files - SMACK64IPIN and SMACK64IPOUT, | |
62 | * Must be set explicitly - SMACK64EXEC and SMACK64MMAP | |
63 | */ | |
64 | #define SMACK_INODE_INIT_XATTRS 2 | |
6bcdfd2c | 65 | |
222a96b3 | 66 | #ifdef SMACK_IPV6_PORT_LABELING |
00720f0e | 67 | static DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 68 | static LIST_HEAD(smk_ipv6_port_list); |
222a96b3 | 69 | #endif |
4e328b08 | 70 | struct kmem_cache *smack_rule_cache; |
bfc3cac0 | 71 | int smack_enabled __initdata; |
c6739443 | 72 | |
c3300aaf AV |
73 | #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s} |
74 | static struct { | |
75 | const char *name; | |
76 | int len; | |
77 | int opt; | |
78 | } smk_mount_opts[] = { | |
6e7739fc | 79 | {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault}, |
c3300aaf | 80 | A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute) |
3bf2789c | 81 | }; |
c3300aaf AV |
82 | #undef A |
83 | ||
84 | static int match_opt_prefix(char *s, int l, char **arg) | |
85 | { | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) { | |
89 | size_t len = smk_mount_opts[i].len; | |
90 | if (len > l || memcmp(s, smk_mount_opts[i].name, len)) | |
91 | continue; | |
92 | if (len == l || s[len] != '=') | |
93 | continue; | |
94 | *arg = s + len + 1; | |
95 | return smk_mount_opts[i].opt; | |
96 | } | |
97 | return Opt_error; | |
98 | } | |
3bf2789c | 99 | |
3d04c924 CS |
100 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
101 | static char *smk_bu_mess[] = { | |
102 | "Bringup Error", /* Unused */ | |
103 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
104 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
105 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
106 | }; | |
107 | ||
d166c802 CS |
108 | static void smk_bu_mode(int mode, char *s) |
109 | { | |
110 | int i = 0; | |
111 | ||
112 | if (mode & MAY_READ) | |
113 | s[i++] = 'r'; | |
114 | if (mode & MAY_WRITE) | |
115 | s[i++] = 'w'; | |
116 | if (mode & MAY_EXEC) | |
117 | s[i++] = 'x'; | |
118 | if (mode & MAY_APPEND) | |
119 | s[i++] = 'a'; | |
120 | if (mode & MAY_TRANSMUTE) | |
121 | s[i++] = 't'; | |
122 | if (mode & MAY_LOCK) | |
123 | s[i++] = 'l'; | |
124 | if (i == 0) | |
125 | s[i++] = '-'; | |
126 | s[i] = '\0'; | |
127 | } | |
128 | #endif | |
129 | ||
130 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
131 | static int smk_bu_note(char *note, struct smack_known *sskp, |
132 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
133 | { |
134 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
135 | ||
136 | if (rc <= 0) | |
137 | return rc; | |
bf4b2fee CS |
138 | if (rc > SMACK_UNCONFINED_OBJECT) |
139 | rc = 0; | |
d166c802 CS |
140 | |
141 | smk_bu_mode(mode, acc); | |
bf4b2fee | 142 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 143 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
144 | return 0; |
145 | } | |
146 | #else | |
21c7eae2 | 147 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
148 | #endif |
149 | ||
150 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
151 | static int smk_bu_current(char *note, struct smack_known *oskp, |
152 | int mode, int rc) | |
d166c802 | 153 | { |
b17103a8 | 154 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 CS |
155 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
156 | ||
157 | if (rc <= 0) | |
158 | return rc; | |
bf4b2fee CS |
159 | if (rc > SMACK_UNCONFINED_OBJECT) |
160 | rc = 0; | |
d166c802 CS |
161 | |
162 | smk_bu_mode(mode, acc); | |
bf4b2fee | 163 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
164 | tsp->smk_task->smk_known, oskp->smk_known, |
165 | acc, current->comm, note); | |
d166c802 CS |
166 | return 0; |
167 | } | |
168 | #else | |
21c7eae2 | 169 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
170 | #endif |
171 | ||
172 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
173 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
174 | { | |
b17103a8 | 175 | struct task_smack *tsp = smack_cred(current_cred()); |
1fb057dc | 176 | struct smack_known *smk_task = smk_of_task_struct_obj(otp); |
d166c802 CS |
177 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
178 | ||
179 | if (rc <= 0) | |
180 | return rc; | |
bf4b2fee CS |
181 | if (rc > SMACK_UNCONFINED_OBJECT) |
182 | rc = 0; | |
d166c802 CS |
183 | |
184 | smk_bu_mode(mode, acc); | |
bf4b2fee | 185 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 186 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
187 | current->comm, otp->comm); |
188 | return 0; | |
189 | } | |
190 | #else | |
191 | #define smk_bu_task(otp, mode, RC) (RC) | |
192 | #endif | |
193 | ||
194 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
195 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
196 | { | |
b17103a8 | 197 | struct task_smack *tsp = smack_cred(current_cred()); |
fb4021b6 | 198 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
199 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
200 | ||
bf4b2fee CS |
201 | if (isp->smk_flags & SMK_INODE_IMPURE) |
202 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
203 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
204 | ||
d166c802 CS |
205 | if (rc <= 0) |
206 | return rc; | |
bf4b2fee CS |
207 | if (rc > SMACK_UNCONFINED_OBJECT) |
208 | rc = 0; | |
209 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
210 | (mode & (MAY_WRITE | MAY_APPEND))) | |
211 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
212 | |
213 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
214 | |
215 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
216 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
217 | inode->i_sb->s_id, inode->i_ino, current->comm); |
218 | return 0; | |
219 | } | |
220 | #else | |
221 | #define smk_bu_inode(inode, mode, RC) (RC) | |
222 | #endif | |
223 | ||
224 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
225 | static int smk_bu_file(struct file *file, int mode, int rc) | |
226 | { | |
b17103a8 | 227 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 | 228 | struct smack_known *sskp = tsp->smk_task; |
5e7270a6 | 229 | struct inode *inode = file_inode(file); |
fb4021b6 | 230 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
231 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
232 | ||
bf4b2fee CS |
233 | if (isp->smk_flags & SMK_INODE_IMPURE) |
234 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
235 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
236 | ||
d166c802 CS |
237 | if (rc <= 0) |
238 | return rc; | |
bf4b2fee CS |
239 | if (rc > SMACK_UNCONFINED_OBJECT) |
240 | rc = 0; | |
d166c802 CS |
241 | |
242 | smk_bu_mode(mode, acc); | |
bf4b2fee | 243 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 244 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 245 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
246 | current->comm); |
247 | return 0; | |
248 | } | |
249 | #else | |
250 | #define smk_bu_file(file, mode, RC) (RC) | |
251 | #endif | |
252 | ||
253 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
254 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
255 | int mode, int rc) | |
256 | { | |
b17103a8 | 257 | struct task_smack *tsp = smack_cred(cred); |
d166c802 | 258 | struct smack_known *sskp = tsp->smk_task; |
45063097 | 259 | struct inode *inode = file_inode(file); |
fb4021b6 | 260 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
261 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
262 | ||
bf4b2fee CS |
263 | if (isp->smk_flags & SMK_INODE_IMPURE) |
264 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
265 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
266 | ||
d166c802 CS |
267 | if (rc <= 0) |
268 | return rc; | |
bf4b2fee CS |
269 | if (rc > SMACK_UNCONFINED_OBJECT) |
270 | rc = 0; | |
d166c802 CS |
271 | |
272 | smk_bu_mode(mode, acc); | |
bf4b2fee | 273 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 274 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 275 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
276 | current->comm); |
277 | return 0; | |
278 | } | |
279 | #else | |
280 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
281 | #endif | |
282 | ||
e114e473 CS |
283 | /** |
284 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 285 | * @name: type of the label (attribute) |
e114e473 CS |
286 | * @ip: a pointer to the inode |
287 | * @dp: a pointer to the dentry | |
288 | * | |
e774ad68 LP |
289 | * Returns a pointer to the master list entry for the Smack label, |
290 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 291 | */ |
2f823ff8 CS |
292 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
293 | struct dentry *dp) | |
e114e473 CS |
294 | { |
295 | int rc; | |
f7112e6c | 296 | char *buffer; |
2f823ff8 | 297 | struct smack_known *skp = NULL; |
e114e473 | 298 | |
5d6c3191 | 299 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 300 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 301 | |
e5bfad3d | 302 | buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS); |
f7112e6c | 303 | if (buffer == NULL) |
e774ad68 | 304 | return ERR_PTR(-ENOMEM); |
e114e473 | 305 | |
5d6c3191 | 306 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
307 | if (rc < 0) |
308 | skp = ERR_PTR(rc); | |
309 | else if (rc == 0) | |
310 | skp = NULL; | |
311 | else | |
2f823ff8 | 312 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
313 | |
314 | kfree(buffer); | |
315 | ||
2f823ff8 | 316 | return skp; |
e114e473 CS |
317 | } |
318 | ||
319 | /** | |
afb1cbe3 | 320 | * init_inode_smack - initialize an inode security blob |
a1a07f22 | 321 | * @inode: inode to extract the info from |
21c7eae2 | 322 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 | 323 | * |
e114e473 | 324 | */ |
afb1cbe3 | 325 | static void init_inode_smack(struct inode *inode, struct smack_known *skp) |
e114e473 | 326 | { |
afb1cbe3 | 327 | struct inode_smack *isp = smack_inode(inode); |
e114e473 | 328 | |
21c7eae2 | 329 | isp->smk_inode = skp; |
e114e473 | 330 | isp->smk_flags = 0; |
e114e473 CS |
331 | } |
332 | ||
7898e1f8 | 333 | /** |
bbd3662a CS |
334 | * init_task_smack - initialize a task security blob |
335 | * @tsp: blob to initialize | |
1a28979b LP |
336 | * @task: a pointer to the Smack label for the running task |
337 | * @forked: a pointer to the Smack label for the forked task | |
7898e1f8 | 338 | * |
7898e1f8 | 339 | */ |
bbd3662a CS |
340 | static void init_task_smack(struct task_smack *tsp, struct smack_known *task, |
341 | struct smack_known *forked) | |
7898e1f8 | 342 | { |
7898e1f8 CS |
343 | tsp->smk_task = task; |
344 | tsp->smk_forked = forked; | |
345 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 346 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 | 347 | mutex_init(&tsp->smk_rules_lock); |
7898e1f8 CS |
348 | } |
349 | ||
350 | /** | |
351 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
352 | * @nhead: new rules header pointer |
353 | * @ohead: old rules header pointer | |
354 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
355 | * |
356 | * Returns 0 on success, -ENOMEM on error | |
357 | */ | |
358 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
359 | gfp_t gfp) | |
360 | { | |
361 | struct smack_rule *nrp; | |
362 | struct smack_rule *orp; | |
363 | int rc = 0; | |
364 | ||
7898e1f8 | 365 | list_for_each_entry_rcu(orp, ohead, list) { |
4e328b08 | 366 | nrp = kmem_cache_zalloc(smack_rule_cache, gfp); |
7898e1f8 CS |
367 | if (nrp == NULL) { |
368 | rc = -ENOMEM; | |
369 | break; | |
370 | } | |
371 | *nrp = *orp; | |
372 | list_add_rcu(&nrp->list, nhead); | |
373 | } | |
374 | return rc; | |
375 | } | |
376 | ||
38416e53 ZJ |
377 | /** |
378 | * smk_copy_relabel - copy smk_relabel labels list | |
379 | * @nhead: new rules header pointer | |
380 | * @ohead: old rules header pointer | |
381 | * @gfp: type of the memory for the allocation | |
382 | * | |
383 | * Returns 0 on success, -ENOMEM on error | |
384 | */ | |
385 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
386 | gfp_t gfp) | |
387 | { | |
388 | struct smack_known_list_elem *nklep; | |
389 | struct smack_known_list_elem *oklep; | |
390 | ||
38416e53 ZJ |
391 | list_for_each_entry(oklep, ohead, list) { |
392 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
393 | if (nklep == NULL) { | |
394 | smk_destroy_label_list(nhead); | |
395 | return -ENOMEM; | |
396 | } | |
397 | nklep->smk_label = oklep->smk_label; | |
398 | list_add(&nklep->list, nhead); | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
5663884c LP |
404 | /** |
405 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
b57d0209 | 406 | * @mode: input mode in form of PTRACE_MODE_* |
5663884c LP |
407 | * |
408 | * Returns a converted MAY_* mode usable by smack rules | |
409 | */ | |
410 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
411 | { | |
3dfb7d8c | 412 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 413 | return MAY_READWRITE; |
3dfb7d8c JH |
414 | if (mode & PTRACE_MODE_READ) |
415 | return MAY_READ; | |
5663884c LP |
416 | |
417 | return 0; | |
418 | } | |
419 | ||
420 | /** | |
421 | * smk_ptrace_rule_check - helper for ptrace access | |
422 | * @tracer: tracer process | |
21c7eae2 | 423 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
424 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
425 | * @func: name of the function that called us, used for audit | |
426 | * | |
427 | * Returns 0 on access granted, -error on error | |
428 | */ | |
21c7eae2 LP |
429 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
430 | struct smack_known *tracee_known, | |
5663884c LP |
431 | unsigned int mode, const char *func) |
432 | { | |
433 | int rc; | |
434 | struct smk_audit_info ad, *saip = NULL; | |
435 | struct task_smack *tsp; | |
21c7eae2 | 436 | struct smack_known *tracer_known; |
dcb569cf | 437 | const struct cred *tracercred; |
5663884c LP |
438 | |
439 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
440 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
441 | smk_ad_setfield_u_tsk(&ad, tracer); | |
442 | saip = &ad; | |
443 | } | |
444 | ||
6d1cff2a | 445 | rcu_read_lock(); |
dcb569cf | 446 | tracercred = __task_cred(tracer); |
b17103a8 | 447 | tsp = smack_cred(tracercred); |
21c7eae2 | 448 | tracer_known = smk_of_task(tsp); |
5663884c | 449 | |
66867818 LP |
450 | if ((mode & PTRACE_MODE_ATTACH) && |
451 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
452 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 453 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
454 | rc = 0; |
455 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
456 | rc = -EACCES; | |
dcb569cf | 457 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
458 | rc = 0; |
459 | else | |
460 | rc = -EACCES; | |
461 | ||
462 | if (saip) | |
21c7eae2 LP |
463 | smack_log(tracer_known->smk_known, |
464 | tracee_known->smk_known, | |
465 | 0, rc, saip); | |
66867818 | 466 | |
6d1cff2a | 467 | rcu_read_unlock(); |
66867818 LP |
468 | return rc; |
469 | } | |
470 | ||
471 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 472 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
473 | |
474 | rcu_read_unlock(); | |
5663884c LP |
475 | return rc; |
476 | } | |
477 | ||
e114e473 CS |
478 | /* |
479 | * LSM hooks. | |
480 | * We he, that is fun! | |
481 | */ | |
482 | ||
483 | /** | |
9e48858f | 484 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 485 | * @ctp: child task pointer |
5663884c | 486 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
487 | * |
488 | * Returns 0 if access is OK, an error code otherwise | |
489 | * | |
5663884c | 490 | * Do the capability checks. |
e114e473 | 491 | */ |
9e48858f | 492 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 493 | { |
2f823ff8 | 494 | struct smack_known *skp; |
e114e473 | 495 | |
1fb057dc | 496 | skp = smk_of_task_struct_obj(ctp); |
ecfcc53f | 497 | |
b1d9e6b0 | 498 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
499 | } |
500 | ||
501 | /** | |
502 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
503 | * @ptp: parent task pointer | |
504 | * | |
505 | * Returns 0 if access is OK, an error code otherwise | |
506 | * | |
5663884c | 507 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
508 | */ |
509 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
510 | { | |
2f823ff8 | 511 | struct smack_known *skp; |
5cd9c58f | 512 | |
b17103a8 | 513 | skp = smk_of_task(smack_cred(current_cred())); |
ecfcc53f | 514 | |
d3f84f5c | 515 | return smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
516 | } |
517 | ||
518 | /** | |
519 | * smack_syslog - Smack approval on syslog | |
a1a07f22 | 520 | * @typefrom_file: unused |
e114e473 | 521 | * |
e114e473 CS |
522 | * Returns 0 on success, error code otherwise. |
523 | */ | |
12b3052c | 524 | static int smack_syslog(int typefrom_file) |
e114e473 | 525 | { |
12b3052c | 526 | int rc = 0; |
2f823ff8 | 527 | struct smack_known *skp = smk_of_current(); |
e114e473 | 528 | |
1880eff7 | 529 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
530 | return 0; |
531 | ||
24ea1b6e | 532 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
533 | rc = -EACCES; |
534 | ||
535 | return rc; | |
536 | } | |
537 | ||
e114e473 CS |
538 | /* |
539 | * Superblock Hooks. | |
540 | */ | |
541 | ||
542 | /** | |
543 | * smack_sb_alloc_security - allocate a superblock blob | |
544 | * @sb: the superblock getting the blob | |
545 | * | |
546 | * Returns 0 on success or -ENOMEM on error. | |
547 | */ | |
548 | static int smack_sb_alloc_security(struct super_block *sb) | |
549 | { | |
1aea7808 | 550 | struct superblock_smack *sbsp = smack_superblock(sb); |
e114e473 | 551 | |
21c7eae2 LP |
552 | sbsp->smk_root = &smack_known_floor; |
553 | sbsp->smk_default = &smack_known_floor; | |
554 | sbsp->smk_floor = &smack_known_floor; | |
555 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 556 | /* |
9f50eda2 | 557 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 558 | */ |
e114e473 CS |
559 | |
560 | return 0; | |
561 | } | |
562 | ||
12085b14 | 563 | struct smack_mnt_opts { |
de93e515 CS |
564 | const char *fsdefault; |
565 | const char *fsfloor; | |
566 | const char *fshat; | |
567 | const char *fsroot; | |
568 | const char *fstransmute; | |
12085b14 | 569 | }; |
e114e473 | 570 | |
204cc0cc AV |
571 | static void smack_free_mnt_opts(void *mnt_opts) |
572 | { | |
de93e515 | 573 | kfree(mnt_opts); |
204cc0cc | 574 | } |
e114e473 | 575 | |
55c0e5bd AV |
576 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
577 | { | |
578 | struct smack_mnt_opts *opts = *mnt_opts; | |
de93e515 | 579 | struct smack_known *skp; |
e114e473 | 580 | |
55c0e5bd AV |
581 | if (!opts) { |
582 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
583 | if (!opts) | |
584 | return -ENOMEM; | |
585 | *mnt_opts = opts; | |
e114e473 | 586 | } |
55c0e5bd AV |
587 | if (!s) |
588 | return -ENOMEM; | |
e114e473 | 589 | |
de93e515 CS |
590 | skp = smk_import_entry(s, 0); |
591 | if (IS_ERR(skp)) | |
592 | return PTR_ERR(skp); | |
593 | ||
55c0e5bd AV |
594 | switch (token) { |
595 | case Opt_fsdefault: | |
596 | if (opts->fsdefault) | |
597 | goto out_opt_err; | |
de93e515 | 598 | opts->fsdefault = skp->smk_known; |
55c0e5bd AV |
599 | break; |
600 | case Opt_fsfloor: | |
601 | if (opts->fsfloor) | |
602 | goto out_opt_err; | |
de93e515 | 603 | opts->fsfloor = skp->smk_known; |
55c0e5bd AV |
604 | break; |
605 | case Opt_fshat: | |
606 | if (opts->fshat) | |
607 | goto out_opt_err; | |
de93e515 | 608 | opts->fshat = skp->smk_known; |
55c0e5bd AV |
609 | break; |
610 | case Opt_fsroot: | |
611 | if (opts->fsroot) | |
612 | goto out_opt_err; | |
de93e515 | 613 | opts->fsroot = skp->smk_known; |
55c0e5bd AV |
614 | break; |
615 | case Opt_fstransmute: | |
616 | if (opts->fstransmute) | |
617 | goto out_opt_err; | |
de93e515 | 618 | opts->fstransmute = skp->smk_known; |
55c0e5bd AV |
619 | break; |
620 | } | |
e114e473 | 621 | return 0; |
55c0e5bd AV |
622 | |
623 | out_opt_err: | |
624 | pr_warn("Smack: duplicate mount options\n"); | |
625 | return -EINVAL; | |
e114e473 CS |
626 | } |
627 | ||
d80a8f1b DH |
628 | /** |
629 | * smack_fs_context_submount - Initialise security data for a filesystem context | |
630 | * @fc: The filesystem context. | |
631 | * @reference: reference superblock | |
632 | * | |
633 | * Returns 0 on success or -ENOMEM on error. | |
634 | */ | |
635 | static int smack_fs_context_submount(struct fs_context *fc, | |
636 | struct super_block *reference) | |
637 | { | |
638 | struct superblock_smack *sbsp; | |
639 | struct smack_mnt_opts *ctx; | |
640 | struct inode_smack *isp; | |
641 | ||
642 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
643 | if (!ctx) | |
644 | return -ENOMEM; | |
645 | fc->security = ctx; | |
646 | ||
647 | sbsp = smack_superblock(reference); | |
648 | isp = smack_inode(reference->s_root->d_inode); | |
649 | ||
650 | if (sbsp->smk_default) { | |
651 | ctx->fsdefault = kstrdup(sbsp->smk_default->smk_known, GFP_KERNEL); | |
652 | if (!ctx->fsdefault) | |
653 | return -ENOMEM; | |
654 | } | |
655 | ||
656 | if (sbsp->smk_floor) { | |
657 | ctx->fsfloor = kstrdup(sbsp->smk_floor->smk_known, GFP_KERNEL); | |
658 | if (!ctx->fsfloor) | |
659 | return -ENOMEM; | |
660 | } | |
661 | ||
662 | if (sbsp->smk_hat) { | |
663 | ctx->fshat = kstrdup(sbsp->smk_hat->smk_known, GFP_KERNEL); | |
664 | if (!ctx->fshat) | |
665 | return -ENOMEM; | |
666 | } | |
667 | ||
668 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
669 | if (sbsp->smk_root) { | |
670 | ctx->fstransmute = kstrdup(sbsp->smk_root->smk_known, GFP_KERNEL); | |
671 | if (!ctx->fstransmute) | |
672 | return -ENOMEM; | |
673 | } | |
674 | } | |
675 | return 0; | |
676 | } | |
677 | ||
0b52075e AV |
678 | /** |
679 | * smack_fs_context_dup - Duplicate the security data on fs_context duplication | |
680 | * @fc: The new filesystem context. | |
681 | * @src_fc: The source filesystem context being duplicated. | |
682 | * | |
683 | * Returns 0 on success or -ENOMEM on error. | |
684 | */ | |
685 | static int smack_fs_context_dup(struct fs_context *fc, | |
686 | struct fs_context *src_fc) | |
687 | { | |
688 | struct smack_mnt_opts *dst, *src = src_fc->security; | |
689 | ||
690 | if (!src) | |
691 | return 0; | |
692 | ||
693 | fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
694 | if (!fc->security) | |
695 | return -ENOMEM; | |
de93e515 | 696 | |
0b52075e | 697 | dst = fc->security; |
de93e515 CS |
698 | dst->fsdefault = src->fsdefault; |
699 | dst->fsfloor = src->fsfloor; | |
700 | dst->fshat = src->fshat; | |
701 | dst->fsroot = src->fsroot; | |
702 | dst->fstransmute = src->fstransmute; | |
0b52075e | 703 | |
0b52075e AV |
704 | return 0; |
705 | } | |
706 | ||
d7167b14 | 707 | static const struct fs_parameter_spec smack_fs_parameters[] = { |
6e7739fc CS |
708 | fsparam_string("smackfsdef", Opt_fsdefault), |
709 | fsparam_string("smackfsdefault", Opt_fsdefault), | |
710 | fsparam_string("smackfsfloor", Opt_fsfloor), | |
711 | fsparam_string("smackfshat", Opt_fshat), | |
712 | fsparam_string("smackfsroot", Opt_fsroot), | |
713 | fsparam_string("smackfstransmute", Opt_fstransmute), | |
2febd254 DH |
714 | {} |
715 | }; | |
716 | ||
2febd254 DH |
717 | /** |
718 | * smack_fs_context_parse_param - Parse a single mount parameter | |
719 | * @fc: The new filesystem context being constructed. | |
720 | * @param: The parameter. | |
721 | * | |
722 | * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on | |
723 | * error. | |
724 | */ | |
725 | static int smack_fs_context_parse_param(struct fs_context *fc, | |
726 | struct fs_parameter *param) | |
727 | { | |
728 | struct fs_parse_result result; | |
729 | int opt, rc; | |
730 | ||
d7167b14 | 731 | opt = fs_parse(fc, smack_fs_parameters, param, &result); |
2febd254 DH |
732 | if (opt < 0) |
733 | return opt; | |
734 | ||
735 | rc = smack_add_opt(opt, param->string, &fc->security); | |
736 | if (!rc) | |
737 | param->string = NULL; | |
738 | return rc; | |
739 | } | |
740 | ||
d2497e12 | 741 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
3bf2789c | 742 | { |
d2497e12 AV |
743 | char *from = options, *to = options; |
744 | bool first = true; | |
3bf2789c | 745 | |
c3300aaf AV |
746 | while (1) { |
747 | char *next = strchr(from, ','); | |
748 | int token, len, rc; | |
749 | char *arg = NULL; | |
3bf2789c | 750 | |
c3300aaf AV |
751 | if (next) |
752 | len = next - from; | |
753 | else | |
754 | len = strlen(from); | |
3bf2789c | 755 | |
c3300aaf | 756 | token = match_opt_prefix(from, len, &arg); |
d2497e12 AV |
757 | if (token != Opt_error) { |
758 | arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL); | |
759 | rc = smack_add_opt(token, arg, mnt_opts); | |
de93e515 | 760 | kfree(arg); |
d2497e12 | 761 | if (unlikely(rc)) { |
d2497e12 AV |
762 | if (*mnt_opts) |
763 | smack_free_mnt_opts(*mnt_opts); | |
764 | *mnt_opts = NULL; | |
765 | return rc; | |
766 | } | |
767 | } else { | |
768 | if (!first) { // copy with preceding comma | |
769 | from--; | |
770 | len++; | |
771 | } | |
772 | if (to != from) | |
773 | memmove(to, from, len); | |
774 | to += len; | |
775 | first = false; | |
3bf2789c | 776 | } |
c3300aaf AV |
777 | if (!from[len]) |
778 | break; | |
779 | from += len + 1; | |
3bf2789c | 780 | } |
d2497e12 | 781 | *to = '\0'; |
3bf2789c | 782 | return 0; |
3bf2789c VT |
783 | } |
784 | ||
785 | /** | |
786 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 787 | * @sb: the file system superblock |
a1a07f22 | 788 | * @mnt_opts: Smack mount options |
3bf2789c VT |
789 | * @kern_flags: mount option from kernel space or user space |
790 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
791 | * |
792 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
793 | * |
794 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
795 | * labels. | |
e114e473 | 796 | */ |
3bf2789c | 797 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 798 | void *mnt_opts, |
3bf2789c VT |
799 | unsigned long kern_flags, |
800 | unsigned long *set_kern_flags) | |
e114e473 CS |
801 | { |
802 | struct dentry *root = sb->s_root; | |
c6f493d6 | 803 | struct inode *inode = d_backing_inode(root); |
1aea7808 | 804 | struct superblock_smack *sp = smack_superblock(sb); |
e114e473 | 805 | struct inode_smack *isp; |
24ea1b6e | 806 | struct smack_known *skp; |
12085b14 AV |
807 | struct smack_mnt_opts *opts = mnt_opts; |
808 | bool transmute = false; | |
e114e473 | 809 | |
9f50eda2 | 810 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 811 | return 0; |
eb982cb4 | 812 | |
2097f599 HS |
813 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
814 | /* | |
815 | * Unprivileged mounts don't get to specify Smack values. | |
816 | */ | |
12085b14 | 817 | if (opts) |
2097f599 HS |
818 | return -EPERM; |
819 | /* | |
820 | * Unprivileged mounts get root and default from the caller. | |
821 | */ | |
822 | skp = smk_of_current(); | |
823 | sp->smk_root = skp; | |
824 | sp->smk_default = skp; | |
825 | /* | |
826 | * For a handful of fs types with no user-controlled | |
827 | * backing store it's okay to trust security labels | |
828 | * in the filesystem. The rest are untrusted. | |
829 | */ | |
830 | if (sb->s_user_ns != &init_user_ns && | |
831 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
832 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 833 | transmute = true; |
2097f599 HS |
834 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
835 | } | |
836 | } | |
837 | ||
9f50eda2 | 838 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 839 | |
12085b14 AV |
840 | if (opts) { |
841 | if (opts->fsdefault) { | |
842 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
843 | if (IS_ERR(skp)) |
844 | return PTR_ERR(skp); | |
3bf2789c | 845 | sp->smk_default = skp; |
12085b14 AV |
846 | } |
847 | if (opts->fsfloor) { | |
848 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
849 | if (IS_ERR(skp)) |
850 | return PTR_ERR(skp); | |
851 | sp->smk_floor = skp; | |
12085b14 AV |
852 | } |
853 | if (opts->fshat) { | |
854 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
855 | if (IS_ERR(skp)) |
856 | return PTR_ERR(skp); | |
3bf2789c | 857 | sp->smk_hat = skp; |
12085b14 AV |
858 | } |
859 | if (opts->fsroot) { | |
860 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
861 | if (IS_ERR(skp)) |
862 | return PTR_ERR(skp); | |
863 | sp->smk_root = skp; | |
12085b14 AV |
864 | } |
865 | if (opts->fstransmute) { | |
866 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
867 | if (IS_ERR(skp)) |
868 | return PTR_ERR(skp); | |
869 | sp->smk_root = skp; | |
12085b14 | 870 | transmute = true; |
e114e473 CS |
871 | } |
872 | } | |
873 | ||
874 | /* | |
875 | * Initialize the root inode. | |
876 | */ | |
afb1cbe3 | 877 | init_inode_smack(inode, sp->smk_root); |
e114e473 | 878 | |
afb1cbe3 CS |
879 | if (transmute) { |
880 | isp = smack_inode(inode); | |
e830b394 | 881 | isp->smk_flags |= SMK_INODE_TRANSMUTE; |
afb1cbe3 | 882 | } |
e830b394 | 883 | |
e114e473 CS |
884 | return 0; |
885 | } | |
886 | ||
887 | /** | |
888 | * smack_sb_statfs - Smack check on statfs | |
889 | * @dentry: identifies the file system in question | |
890 | * | |
891 | * Returns 0 if current can read the floor of the filesystem, | |
892 | * and error code otherwise | |
893 | */ | |
894 | static int smack_sb_statfs(struct dentry *dentry) | |
895 | { | |
1aea7808 | 896 | struct superblock_smack *sbp = smack_superblock(dentry->d_sb); |
ecfcc53f EB |
897 | int rc; |
898 | struct smk_audit_info ad; | |
899 | ||
a269434d | 900 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 901 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 902 | |
ecfcc53f | 903 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 904 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 905 | return rc; |
e114e473 CS |
906 | } |
907 | ||
676dac4b CS |
908 | /* |
909 | * BPRM hooks | |
910 | */ | |
911 | ||
ce8a4321 | 912 | /** |
b8bff599 | 913 | * smack_bprm_creds_for_exec - Update bprm->cred if needed for exec |
ce8a4321 CS |
914 | * @bprm: the exec information |
915 | * | |
5663884c | 916 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 917 | */ |
b8bff599 | 918 | static int smack_bprm_creds_for_exec(struct linux_binprm *bprm) |
676dac4b | 919 | { |
496ad9aa | 920 | struct inode *inode = file_inode(bprm->file); |
b17103a8 | 921 | struct task_smack *bsp = smack_cred(bprm->cred); |
676dac4b | 922 | struct inode_smack *isp; |
809c02e0 | 923 | struct superblock_smack *sbsp; |
676dac4b CS |
924 | int rc; |
925 | ||
fb4021b6 | 926 | isp = smack_inode(inode); |
84088ba2 | 927 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) |
676dac4b CS |
928 | return 0; |
929 | ||
1aea7808 | 930 | sbsp = smack_superblock(inode->i_sb); |
809c02e0 SF |
931 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && |
932 | isp->smk_task != sbsp->smk_root) | |
933 | return 0; | |
934 | ||
9227dd2a | 935 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
936 | struct task_struct *tracer; |
937 | rc = 0; | |
938 | ||
939 | rcu_read_lock(); | |
940 | tracer = ptrace_parent(current); | |
941 | if (likely(tracer != NULL)) | |
942 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 943 | isp->smk_task, |
5663884c LP |
944 | PTRACE_MODE_ATTACH, |
945 | __func__); | |
946 | rcu_read_unlock(); | |
947 | ||
948 | if (rc != 0) | |
949 | return rc; | |
3675f052 JH |
950 | } |
951 | if (bprm->unsafe & ~LSM_UNSAFE_PTRACE) | |
84088ba2 | 952 | return -EPERM; |
676dac4b | 953 | |
84088ba2 JS |
954 | bsp->smk_task = isp->smk_task; |
955 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 956 | |
ccbb6e10 KC |
957 | /* Decide if this is a secure exec. */ |
958 | if (bsp->smk_task != bsp->smk_forked) | |
959 | bprm->secureexec = 1; | |
960 | ||
84088ba2 JS |
961 | return 0; |
962 | } | |
676dac4b | 963 | |
e114e473 CS |
964 | /* |
965 | * Inode hooks | |
966 | */ | |
967 | ||
968 | /** | |
969 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 970 | * @inode: the inode in need of a blob |
e114e473 | 971 | * |
a1a07f22 | 972 | * Returns 0 |
e114e473 CS |
973 | */ |
974 | static int smack_inode_alloc_security(struct inode *inode) | |
975 | { | |
2f823ff8 CS |
976 | struct smack_known *skp = smk_of_current(); |
977 | ||
afb1cbe3 | 978 | init_inode_smack(inode, skp); |
e114e473 CS |
979 | return 0; |
980 | } | |
981 | ||
e114e473 CS |
982 | /** |
983 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
984 | * @inode: the newly created inode |
985 | * @dir: containing directory object | |
2a7dba39 | 986 | * @qstr: unused |
6bcdfd2c RS |
987 | * @xattrs: where to put the attributes |
988 | * @xattr_count: current number of LSM-provided xattrs (updated) | |
e114e473 CS |
989 | * |
990 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
991 | */ | |
992 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
6bcdfd2c RS |
993 | const struct qstr *qstr, |
994 | struct xattr *xattrs, int *xattr_count) | |
e114e473 | 995 | { |
2c085f3a | 996 | struct task_smack *tsp = smack_cred(current_cred()); |
e63d86b8 | 997 | struct inode_smack *issp = smack_inode(inode); |
2c085f3a | 998 | struct smack_known *skp = smk_of_task(tsp); |
21c7eae2 LP |
999 | struct smack_known *isp = smk_of_inode(inode); |
1000 | struct smack_known *dsp = smk_of_inode(dir); | |
6bcdfd2c | 1001 | struct xattr *xattr = lsm_get_xattr_slot(xattrs, xattr_count); |
7898e1f8 | 1002 | int may; |
e114e473 | 1003 | |
51b15e79 RS |
1004 | /* |
1005 | * If equal, transmuting already occurred in | |
1006 | * smack_dentry_create_files_as(). No need to check again. | |
1007 | */ | |
1008 | if (tsp->smk_task != tsp->smk_transmuted) { | |
1009 | rcu_read_lock(); | |
1010 | may = smk_access_entry(skp->smk_known, dsp->smk_known, | |
1011 | &skp->smk_rules); | |
1012 | rcu_read_unlock(); | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * In addition to having smk_task equal to smk_transmuted, | |
1017 | * if the access rule allows transmutation and the directory | |
1018 | * requests transmutation then by all means transmute. | |
1019 | * Mark the inode as changed. | |
1020 | */ | |
1021 | if ((tsp->smk_task == tsp->smk_transmuted) || | |
1022 | (may > 0 && ((may & MAY_TRANSMUTE) != 0) && | |
1023 | smk_inode_transmutable(dir))) { | |
1024 | struct xattr *xattr_transmute; | |
5c6d1125 JS |
1025 | |
1026 | /* | |
51b15e79 RS |
1027 | * The caller of smack_dentry_create_files_as() |
1028 | * should have overridden the current cred, so the | |
1029 | * inode label was already set correctly in | |
1030 | * smack_inode_alloc_security(). | |
5c6d1125 | 1031 | */ |
51b15e79 | 1032 | if (tsp->smk_task != tsp->smk_transmuted) |
e63d86b8 RS |
1033 | isp = issp->smk_inode = dsp; |
1034 | ||
1035 | issp->smk_flags |= SMK_INODE_TRANSMUTE; | |
51b15e79 RS |
1036 | xattr_transmute = lsm_get_xattr_slot(xattrs, |
1037 | xattr_count); | |
1038 | if (xattr_transmute) { | |
1039 | xattr_transmute->value = kmemdup(TRANS_TRUE, | |
1040 | TRANS_TRUE_SIZE, | |
1041 | GFP_NOFS); | |
1042 | if (!xattr_transmute->value) | |
1043 | return -ENOMEM; | |
1044 | ||
1045 | xattr_transmute->value_len = TRANS_TRUE_SIZE; | |
1046 | xattr_transmute->name = XATTR_SMACK_TRANSMUTE; | |
2267b13a | 1047 | } |
51b15e79 | 1048 | } |
5c6d1125 | 1049 | |
e63d86b8 RS |
1050 | issp->smk_flags |= SMK_INODE_INSTANT; |
1051 | ||
51b15e79 | 1052 | if (xattr) { |
6bcdfd2c RS |
1053 | xattr->value = kstrdup(isp->smk_known, GFP_NOFS); |
1054 | if (!xattr->value) | |
e114e473 | 1055 | return -ENOMEM; |
e114e473 | 1056 | |
6bcdfd2c RS |
1057 | xattr->value_len = strlen(isp->smk_known); |
1058 | xattr->name = XATTR_SMACK_SUFFIX; | |
68390ccf | 1059 | } |
e114e473 CS |
1060 | |
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * smack_inode_link - Smack check on link | |
1066 | * @old_dentry: the existing object | |
1067 | * @dir: unused | |
1068 | * @new_dentry: the new object | |
1069 | * | |
1070 | * Returns 0 if access is permitted, an error code otherwise | |
1071 | */ | |
1072 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1073 | struct dentry *new_dentry) | |
1074 | { | |
21c7eae2 | 1075 | struct smack_known *isp; |
ecfcc53f EB |
1076 | struct smk_audit_info ad; |
1077 | int rc; | |
1078 | ||
a269434d | 1079 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1080 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1081 | |
c6f493d6 | 1082 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1083 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1084 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1085 | |
8802565b | 1086 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1087 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1088 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1089 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1090 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1091 | } |
1092 | ||
1093 | return rc; | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * smack_inode_unlink - Smack check on inode deletion | |
1098 | * @dir: containing directory object | |
1099 | * @dentry: file to unlink | |
1100 | * | |
1101 | * Returns 0 if current can write the containing directory | |
1102 | * and the object, error code otherwise | |
1103 | */ | |
1104 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1105 | { | |
c6f493d6 | 1106 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1107 | struct smk_audit_info ad; |
e114e473 CS |
1108 | int rc; |
1109 | ||
a269434d | 1110 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1111 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1112 | ||
e114e473 CS |
1113 | /* |
1114 | * You need write access to the thing you're unlinking | |
1115 | */ | |
ecfcc53f | 1116 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1117 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1118 | if (rc == 0) { |
e114e473 CS |
1119 | /* |
1120 | * You also need write access to the containing directory | |
1121 | */ | |
cdb56b60 | 1122 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1123 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1124 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1125 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1126 | } |
e114e473 CS |
1127 | return rc; |
1128 | } | |
1129 | ||
1130 | /** | |
1131 | * smack_inode_rmdir - Smack check on directory deletion | |
1132 | * @dir: containing directory object | |
1133 | * @dentry: directory to unlink | |
1134 | * | |
1135 | * Returns 0 if current can write the containing directory | |
1136 | * and the directory, error code otherwise | |
1137 | */ | |
1138 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1139 | { | |
ecfcc53f | 1140 | struct smk_audit_info ad; |
e114e473 CS |
1141 | int rc; |
1142 | ||
a269434d | 1143 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1144 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1145 | ||
e114e473 CS |
1146 | /* |
1147 | * You need write access to the thing you're removing | |
1148 | */ | |
c6f493d6 DH |
1149 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1150 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1151 | if (rc == 0) { |
e114e473 CS |
1152 | /* |
1153 | * You also need write access to the containing directory | |
1154 | */ | |
cdb56b60 | 1155 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1156 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1157 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1158 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1159 | } |
e114e473 CS |
1160 | |
1161 | return rc; | |
1162 | } | |
1163 | ||
1164 | /** | |
1165 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1166 | * @old_inode: unused |
1167 | * @old_dentry: the old object | |
1168 | * @new_inode: unused | |
1169 | * @new_dentry: the new object | |
e114e473 CS |
1170 | * |
1171 | * Read and write access is required on both the old and | |
1172 | * new directories. | |
1173 | * | |
1174 | * Returns 0 if access is permitted, an error code otherwise | |
1175 | */ | |
1176 | static int smack_inode_rename(struct inode *old_inode, | |
1177 | struct dentry *old_dentry, | |
1178 | struct inode *new_inode, | |
1179 | struct dentry *new_dentry) | |
1180 | { | |
1181 | int rc; | |
21c7eae2 | 1182 | struct smack_known *isp; |
ecfcc53f EB |
1183 | struct smk_audit_info ad; |
1184 | ||
a269434d | 1185 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1186 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1187 | |
c6f493d6 | 1188 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1189 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1190 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1191 | |
8802565b | 1192 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1193 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1194 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1195 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1196 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1197 | } |
e114e473 CS |
1198 | return rc; |
1199 | } | |
1200 | ||
1201 | /** | |
1202 | * smack_inode_permission - Smack version of permission() | |
1203 | * @inode: the inode in question | |
1204 | * @mask: the access requested | |
e114e473 CS |
1205 | * |
1206 | * This is the important Smack hook. | |
1207 | * | |
a1a07f22 | 1208 | * Returns 0 if access is permitted, an error code otherwise |
e114e473 | 1209 | */ |
e74f71eb | 1210 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1211 | { |
1aea7808 | 1212 | struct superblock_smack *sbsp = smack_superblock(inode->i_sb); |
ecfcc53f | 1213 | struct smk_audit_info ad; |
e74f71eb | 1214 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1215 | int rc; |
d09ca739 EP |
1216 | |
1217 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1218 | /* |
1219 | * No permission to check. Existence test. Yup, it's there. | |
1220 | */ | |
1221 | if (mask == 0) | |
1222 | return 0; | |
8c9e80ed | 1223 | |
9f50eda2 SF |
1224 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1225 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1226 | return -EACCES; | |
1227 | } | |
1228 | ||
8c9e80ed | 1229 | /* May be droppable after audit */ |
e74f71eb | 1230 | if (no_block) |
8c9e80ed | 1231 | return -ECHILD; |
f48b7399 | 1232 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1233 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1234 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1235 | rc = smk_bu_inode(inode, mask, rc); | |
1236 | return rc; | |
e114e473 CS |
1237 | } |
1238 | ||
1239 | /** | |
1240 | * smack_inode_setattr - Smack check for setting attributes | |
314a8dc7 | 1241 | * @idmap: idmap of the mount |
e114e473 CS |
1242 | * @dentry: the object |
1243 | * @iattr: for the force flag | |
1244 | * | |
1245 | * Returns 0 if access is permitted, an error code otherwise | |
1246 | */ | |
314a8dc7 RS |
1247 | static int smack_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
1248 | struct iattr *iattr) | |
e114e473 | 1249 | { |
ecfcc53f | 1250 | struct smk_audit_info ad; |
d166c802 CS |
1251 | int rc; |
1252 | ||
e114e473 CS |
1253 | /* |
1254 | * Need to allow for clearing the setuid bit. | |
1255 | */ | |
1256 | if (iattr->ia_valid & ATTR_FORCE) | |
1257 | return 0; | |
a269434d | 1258 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1259 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1260 | |
c6f493d6 DH |
1261 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1262 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1263 | return rc; |
e114e473 CS |
1264 | } |
1265 | ||
1266 | /** | |
1267 | * smack_inode_getattr - Smack check for getting attributes | |
a1a07f22 | 1268 | * @path: path to extract the info from |
e114e473 CS |
1269 | * |
1270 | * Returns 0 if access is permitted, an error code otherwise | |
1271 | */ | |
3f7036a0 | 1272 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1273 | { |
ecfcc53f | 1274 | struct smk_audit_info ad; |
c6f493d6 | 1275 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1276 | int rc; |
ecfcc53f | 1277 | |
f48b7399 | 1278 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1279 | smk_ad_setfield_u_fs_path(&ad, *path); |
1280 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1281 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1282 | return rc; |
e114e473 CS |
1283 | } |
1284 | ||
1285 | /** | |
1286 | * smack_inode_setxattr - Smack check for setting xattrs | |
39f60c1c | 1287 | * @idmap: idmap of the mount |
e114e473 CS |
1288 | * @dentry: the object |
1289 | * @name: name of the attribute | |
e95ef49b LP |
1290 | * @value: value of the attribute |
1291 | * @size: size of the value | |
e114e473 CS |
1292 | * @flags: unused |
1293 | * | |
1294 | * This protects the Smack attribute explicitly. | |
1295 | * | |
1296 | * Returns 0 if access is permitted, an error code otherwise | |
1297 | */ | |
39f60c1c | 1298 | static int smack_inode_setxattr(struct mnt_idmap *idmap, |
71bc356f | 1299 | struct dentry *dentry, const char *name, |
8f0cfa52 | 1300 | const void *value, size_t size, int flags) |
e114e473 | 1301 | { |
ecfcc53f | 1302 | struct smk_audit_info ad; |
19760ad0 CS |
1303 | struct smack_known *skp; |
1304 | int check_priv = 0; | |
1305 | int check_import = 0; | |
1306 | int check_star = 0; | |
bcdca225 | 1307 | int rc = 0; |
e114e473 | 1308 | |
19760ad0 CS |
1309 | /* |
1310 | * Check label validity here so import won't fail in post_setxattr | |
1311 | */ | |
bcdca225 CS |
1312 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1313 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1314 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1315 | check_priv = 1; | |
1316 | check_import = 1; | |
1317 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1318 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1319 | check_priv = 1; | |
1320 | check_import = 1; | |
1321 | check_star = 1; | |
5c6d1125 | 1322 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1323 | check_priv = 1; |
9c821692 RS |
1324 | if (!S_ISDIR(d_backing_inode(dentry)->i_mode) || |
1325 | size != TRANS_TRUE_SIZE || | |
5c6d1125 JS |
1326 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) |
1327 | rc = -EINVAL; | |
bcdca225 CS |
1328 | } else |
1329 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1330 | ||
19760ad0 CS |
1331 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1332 | rc = -EPERM; | |
1333 | ||
1334 | if (rc == 0 && check_import) { | |
b862e561 | 1335 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1336 | if (IS_ERR(skp)) |
1337 | rc = PTR_ERR(skp); | |
1338 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1339 | (skp == &smack_known_star || skp == &smack_known_web))) |
1340 | rc = -EINVAL; | |
1341 | } | |
1342 | ||
a269434d | 1343 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1344 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1345 | ||
d166c802 | 1346 | if (rc == 0) { |
c6f493d6 DH |
1347 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1348 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1349 | } |
bcdca225 CS |
1350 | |
1351 | return rc; | |
e114e473 CS |
1352 | } |
1353 | ||
1354 | /** | |
1355 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1356 | * @dentry: object | |
1357 | * @name: attribute name | |
1358 | * @value: attribute value | |
1359 | * @size: attribute size | |
1360 | * @flags: unused | |
1361 | * | |
1362 | * Set the pointer in the inode blob to the entry found | |
1363 | * in the master label list. | |
1364 | */ | |
8f0cfa52 DH |
1365 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1366 | const void *value, size_t size, int flags) | |
e114e473 | 1367 | { |
2f823ff8 | 1368 | struct smack_known *skp; |
fb4021b6 | 1369 | struct inode_smack *isp = smack_inode(d_backing_inode(dentry)); |
676dac4b | 1370 | |
2f823ff8 CS |
1371 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1372 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1373 | return; | |
1374 | } | |
1375 | ||
676dac4b | 1376 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1377 | skp = smk_import_entry(value, size); |
e774ad68 | 1378 | if (!IS_ERR(skp)) |
21c7eae2 | 1379 | isp->smk_inode = skp; |
5c6d1125 | 1380 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1381 | skp = smk_import_entry(value, size); |
e774ad68 | 1382 | if (!IS_ERR(skp)) |
2f823ff8 | 1383 | isp->smk_task = skp; |
7898e1f8 | 1384 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1385 | skp = smk_import_entry(value, size); |
e774ad68 | 1386 | if (!IS_ERR(skp)) |
2f823ff8 | 1387 | isp->smk_mmap = skp; |
2f823ff8 | 1388 | } |
e114e473 CS |
1389 | |
1390 | return; | |
1391 | } | |
1392 | ||
ce8a4321 | 1393 | /** |
e114e473 CS |
1394 | * smack_inode_getxattr - Smack check on getxattr |
1395 | * @dentry: the object | |
1396 | * @name: unused | |
1397 | * | |
1398 | * Returns 0 if access is permitted, an error code otherwise | |
1399 | */ | |
8f0cfa52 | 1400 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1401 | { |
ecfcc53f | 1402 | struct smk_audit_info ad; |
d166c802 | 1403 | int rc; |
ecfcc53f | 1404 | |
a269434d | 1405 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1406 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1407 | ||
c6f493d6 DH |
1408 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1409 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1410 | return rc; |
e114e473 CS |
1411 | } |
1412 | ||
ce8a4321 | 1413 | /** |
e114e473 | 1414 | * smack_inode_removexattr - Smack check on removexattr |
39f60c1c | 1415 | * @idmap: idmap of the mount |
e114e473 CS |
1416 | * @dentry: the object |
1417 | * @name: name of the attribute | |
1418 | * | |
1419 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1420 | * | |
1421 | * Returns 0 if access is permitted, an error code otherwise | |
1422 | */ | |
39f60c1c | 1423 | static int smack_inode_removexattr(struct mnt_idmap *idmap, |
71bc356f | 1424 | struct dentry *dentry, const char *name) |
e114e473 | 1425 | { |
676dac4b | 1426 | struct inode_smack *isp; |
ecfcc53f | 1427 | struct smk_audit_info ad; |
bcdca225 | 1428 | int rc = 0; |
e114e473 | 1429 | |
bcdca225 CS |
1430 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1431 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1432 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1433 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1434 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1435 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1436 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1437 | rc = -EPERM; |
1438 | } else | |
39f60c1c | 1439 | rc = cap_inode_removexattr(idmap, dentry, name); |
bcdca225 | 1440 | |
f59bdfba CS |
1441 | if (rc != 0) |
1442 | return rc; | |
1443 | ||
a269434d | 1444 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1445 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1446 | |
c6f493d6 DH |
1447 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1448 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1449 | if (rc != 0) |
1450 | return rc; | |
1451 | ||
fb4021b6 | 1452 | isp = smack_inode(d_backing_inode(dentry)); |
f59bdfba CS |
1453 | /* |
1454 | * Don't do anything special for these. | |
1455 | * XATTR_NAME_SMACKIPIN | |
1456 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1457 | */ |
8012495e | 1458 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1459 | struct super_block *sbp = dentry->d_sb; |
1aea7808 | 1460 | struct superblock_smack *sbsp = smack_superblock(sbp); |
8012495e JB |
1461 | |
1462 | isp->smk_inode = sbsp->smk_default; | |
1463 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1464 | isp->smk_task = NULL; |
f59bdfba | 1465 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1466 | isp->smk_mmap = NULL; |
f59bdfba CS |
1467 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1468 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1469 | |
f59bdfba | 1470 | return 0; |
e114e473 CS |
1471 | } |
1472 | ||
44faac01 CB |
1473 | /** |
1474 | * smack_inode_set_acl - Smack check for setting posix acls | |
700b7940 | 1475 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1476 | * @dentry: the object |
1477 | * @acl_name: name of the posix acl | |
1478 | * @kacl: the posix acls | |
1479 | * | |
1480 | * Returns 0 if access is permitted, an error code otherwise | |
1481 | */ | |
700b7940 | 1482 | static int smack_inode_set_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1483 | struct dentry *dentry, const char *acl_name, |
1484 | struct posix_acl *kacl) | |
1485 | { | |
1486 | struct smk_audit_info ad; | |
1487 | int rc; | |
1488 | ||
1489 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1490 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1491 | ||
1492 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); | |
1493 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
1494 | return rc; | |
1495 | } | |
1496 | ||
1497 | /** | |
1498 | * smack_inode_get_acl - Smack check for getting posix acls | |
700b7940 | 1499 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1500 | * @dentry: the object |
1501 | * @acl_name: name of the posix acl | |
1502 | * | |
1503 | * Returns 0 if access is permitted, an error code otherwise | |
1504 | */ | |
700b7940 | 1505 | static int smack_inode_get_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1506 | struct dentry *dentry, const char *acl_name) |
1507 | { | |
1508 | struct smk_audit_info ad; | |
1509 | int rc; | |
1510 | ||
1511 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1512 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1513 | ||
1514 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); | |
1515 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
1516 | return rc; | |
1517 | } | |
1518 | ||
1519 | /** | |
1520 | * smack_inode_remove_acl - Smack check for getting posix acls | |
700b7940 | 1521 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1522 | * @dentry: the object |
1523 | * @acl_name: name of the posix acl | |
1524 | * | |
1525 | * Returns 0 if access is permitted, an error code otherwise | |
1526 | */ | |
700b7940 | 1527 | static int smack_inode_remove_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1528 | struct dentry *dentry, const char *acl_name) |
1529 | { | |
1530 | struct smk_audit_info ad; | |
1531 | int rc; | |
1532 | ||
1533 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1534 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1535 | ||
1536 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); | |
1537 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
1538 | return rc; | |
1539 | } | |
1540 | ||
e114e473 CS |
1541 | /** |
1542 | * smack_inode_getsecurity - get smack xattrs | |
4609e1f1 | 1543 | * @idmap: idmap of the mount |
e114e473 CS |
1544 | * @inode: the object |
1545 | * @name: attribute name | |
1546 | * @buffer: where to put the result | |
57e7ba04 | 1547 | * @alloc: duplicate memory |
e114e473 CS |
1548 | * |
1549 | * Returns the size of the attribute or an error code | |
1550 | */ | |
4609e1f1 | 1551 | static int smack_inode_getsecurity(struct mnt_idmap *idmap, |
71bc356f CB |
1552 | struct inode *inode, const char *name, |
1553 | void **buffer, bool alloc) | |
e114e473 CS |
1554 | { |
1555 | struct socket_smack *ssp; | |
1556 | struct socket *sock; | |
1557 | struct super_block *sbp; | |
502a29b0 | 1558 | struct inode *ip = inode; |
21c7eae2 | 1559 | struct smack_known *isp; |
3a3d8fce RS |
1560 | struct inode_smack *ispp; |
1561 | size_t label_len; | |
1562 | char *label = NULL; | |
e114e473 | 1563 | |
3a3d8fce | 1564 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
e114e473 | 1565 | isp = smk_of_inode(inode); |
3a3d8fce RS |
1566 | } else if (strcmp(name, XATTR_SMACK_TRANSMUTE) == 0) { |
1567 | ispp = smack_inode(inode); | |
1568 | if (ispp->smk_flags & SMK_INODE_TRANSMUTE) | |
1569 | label = TRANS_TRUE; | |
1570 | else | |
1571 | label = ""; | |
1572 | } else { | |
57e7ba04 CS |
1573 | /* |
1574 | * The rest of the Smack xattrs are only on sockets. | |
1575 | */ | |
1576 | sbp = ip->i_sb; | |
1577 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1578 | return -EOPNOTSUPP; | |
e114e473 | 1579 | |
57e7ba04 CS |
1580 | sock = SOCKET_I(ip); |
1581 | if (sock == NULL || sock->sk == NULL) | |
1582 | return -EOPNOTSUPP; | |
e114e473 | 1583 | |
57e7ba04 | 1584 | ssp = sock->sk->sk_security; |
e114e473 | 1585 | |
57e7ba04 CS |
1586 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1587 | isp = ssp->smk_in; | |
1588 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1589 | isp = ssp->smk_out; | |
1590 | else | |
1591 | return -EOPNOTSUPP; | |
1592 | } | |
e114e473 | 1593 | |
3a3d8fce RS |
1594 | if (!label) |
1595 | label = isp->smk_known; | |
1596 | ||
1597 | label_len = strlen(label); | |
1598 | ||
57e7ba04 | 1599 | if (alloc) { |
3a3d8fce | 1600 | *buffer = kstrdup(label, GFP_KERNEL); |
57e7ba04 CS |
1601 | if (*buffer == NULL) |
1602 | return -ENOMEM; | |
e114e473 CS |
1603 | } |
1604 | ||
3a3d8fce | 1605 | return label_len; |
e114e473 CS |
1606 | } |
1607 | ||
1608 | ||
1609 | /** | |
1610 | * smack_inode_listsecurity - list the Smack attributes | |
1611 | * @inode: the object | |
1612 | * @buffer: where they go | |
1613 | * @buffer_size: size of buffer | |
e114e473 CS |
1614 | */ |
1615 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1616 | size_t buffer_size) | |
1617 | { | |
fd5c9d23 | 1618 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1619 | |
fd5c9d23 | 1620 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1621 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1622 | |
1623 | return len; | |
e114e473 CS |
1624 | } |
1625 | ||
d20bdda6 AD |
1626 | /** |
1627 | * smack_inode_getsecid - Extract inode's security id | |
1628 | * @inode: inode to extract the info from | |
1629 | * @secid: where result will be saved | |
1630 | */ | |
d6335d77 | 1631 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1632 | { |
0f8983cf | 1633 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1634 | |
0f8983cf | 1635 | *secid = skp->smk_secid; |
d20bdda6 AD |
1636 | } |
1637 | ||
e114e473 CS |
1638 | /* |
1639 | * File Hooks | |
1640 | */ | |
1641 | ||
491a0b08 CS |
1642 | /* |
1643 | * There is no smack_file_permission hook | |
e114e473 CS |
1644 | * |
1645 | * Should access checks be done on each read or write? | |
1646 | * UNICOS and SELinux say yes. | |
1647 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1648 | * | |
1649 | * I'll say no for now. Smack does not do the frequent | |
1650 | * label changing that SELinux does. | |
1651 | */ | |
e114e473 CS |
1652 | |
1653 | /** | |
1654 | * smack_file_alloc_security - assign a file security blob | |
1655 | * @file: the object | |
1656 | * | |
1657 | * The security blob for a file is a pointer to the master | |
1658 | * label list, so no allocation is done. | |
1659 | * | |
5e7270a6 CS |
1660 | * f_security is the owner security information. It |
1661 | * isn't used on file access checks, it's for send_sigio. | |
1662 | * | |
e114e473 CS |
1663 | * Returns 0 |
1664 | */ | |
1665 | static int smack_file_alloc_security(struct file *file) | |
1666 | { | |
f28952ac | 1667 | struct smack_known **blob = smack_file(file); |
2f823ff8 | 1668 | |
f28952ac | 1669 | *blob = smk_of_current(); |
e114e473 CS |
1670 | return 0; |
1671 | } | |
1672 | ||
e114e473 CS |
1673 | /** |
1674 | * smack_file_ioctl - Smack check on ioctls | |
1675 | * @file: the object | |
1676 | * @cmd: what to do | |
1677 | * @arg: unused | |
1678 | * | |
1679 | * Relies heavily on the correct use of the ioctl command conventions. | |
1680 | * | |
1681 | * Returns 0 if allowed, error code otherwise | |
1682 | */ | |
1683 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1684 | unsigned long arg) | |
1685 | { | |
1686 | int rc = 0; | |
ecfcc53f | 1687 | struct smk_audit_info ad; |
5e7270a6 | 1688 | struct inode *inode = file_inode(file); |
ecfcc53f | 1689 | |
83a1e53f SWK |
1690 | if (unlikely(IS_PRIVATE(inode))) |
1691 | return 0; | |
1692 | ||
f48b7399 | 1693 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1694 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1695 | |
d166c802 | 1696 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1697 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1698 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1699 | } | |
e114e473 | 1700 | |
d166c802 | 1701 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1702 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1703 | rc = smk_bu_file(file, MAY_READ, rc); |
1704 | } | |
e114e473 CS |
1705 | |
1706 | return rc; | |
1707 | } | |
1708 | ||
1709 | /** | |
1710 | * smack_file_lock - Smack check on file locking | |
1711 | * @file: the object | |
251a2a95 | 1712 | * @cmd: unused |
e114e473 | 1713 | * |
c0ab6e56 | 1714 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1715 | */ |
1716 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1717 | { | |
ecfcc53f | 1718 | struct smk_audit_info ad; |
d166c802 | 1719 | int rc; |
5e7270a6 | 1720 | struct inode *inode = file_inode(file); |
ecfcc53f | 1721 | |
83a1e53f SWK |
1722 | if (unlikely(IS_PRIVATE(inode))) |
1723 | return 0; | |
1724 | ||
92f42509 EP |
1725 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1726 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1727 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1728 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1729 | return rc; | |
e114e473 CS |
1730 | } |
1731 | ||
1732 | /** | |
1733 | * smack_file_fcntl - Smack check on fcntl | |
1734 | * @file: the object | |
1735 | * @cmd: what action to check | |
1736 | * @arg: unused | |
1737 | * | |
531f1d45 CS |
1738 | * Generally these operations are harmless. |
1739 | * File locking operations present an obvious mechanism | |
1740 | * for passing information, so they require write access. | |
1741 | * | |
e114e473 CS |
1742 | * Returns 0 if current has access, error code otherwise |
1743 | */ | |
1744 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1745 | unsigned long arg) | |
1746 | { | |
ecfcc53f | 1747 | struct smk_audit_info ad; |
531f1d45 | 1748 | int rc = 0; |
5e7270a6 | 1749 | struct inode *inode = file_inode(file); |
ecfcc53f | 1750 | |
83a1e53f SWK |
1751 | if (unlikely(IS_PRIVATE(inode))) |
1752 | return 0; | |
1753 | ||
e114e473 | 1754 | switch (cmd) { |
e114e473 | 1755 | case F_GETLK: |
c0ab6e56 | 1756 | break; |
e114e473 CS |
1757 | case F_SETLK: |
1758 | case F_SETLKW: | |
c0ab6e56 CS |
1759 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1760 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1761 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1762 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1763 | break; |
e114e473 CS |
1764 | case F_SETOWN: |
1765 | case F_SETSIG: | |
531f1d45 CS |
1766 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1767 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1768 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1769 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1770 | break; |
1771 | default: | |
531f1d45 | 1772 | break; |
e114e473 CS |
1773 | } |
1774 | ||
1775 | return rc; | |
1776 | } | |
1777 | ||
7898e1f8 | 1778 | /** |
b57d0209 CS |
1779 | * smack_mmap_file - Check permissions for a mmap operation. |
1780 | * @file: contains the file structure for file to map (may be NULL). | |
1781 | * @reqprot: contains the protection requested by the application. | |
1782 | * @prot: contains the protection that will be applied by the kernel. | |
1783 | * @flags: contains the operational flags. | |
1784 | * | |
1785 | * The @file may be NULL, e.g. if mapping anonymous memory. | |
1786 | * | |
7898e1f8 CS |
1787 | * Return 0 if permission is granted. |
1788 | */ | |
e5467859 | 1789 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1790 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1791 | unsigned long flags) |
7898e1f8 | 1792 | { |
272cd7a8 | 1793 | struct smack_known *skp; |
2f823ff8 | 1794 | struct smack_known *mkp; |
7898e1f8 CS |
1795 | struct smack_rule *srp; |
1796 | struct task_smack *tsp; | |
21c7eae2 | 1797 | struct smack_known *okp; |
7898e1f8 | 1798 | struct inode_smack *isp; |
809c02e0 | 1799 | struct superblock_smack *sbsp; |
0e0a070d CS |
1800 | int may; |
1801 | int mmay; | |
1802 | int tmay; | |
7898e1f8 CS |
1803 | int rc; |
1804 | ||
496ad9aa | 1805 | if (file == NULL) |
7898e1f8 CS |
1806 | return 0; |
1807 | ||
83a1e53f SWK |
1808 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1809 | return 0; | |
1810 | ||
fb4021b6 | 1811 | isp = smack_inode(file_inode(file)); |
7898e1f8 CS |
1812 | if (isp->smk_mmap == NULL) |
1813 | return 0; | |
1aea7808 | 1814 | sbsp = smack_superblock(file_inode(file)->i_sb); |
809c02e0 SF |
1815 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && |
1816 | isp->smk_mmap != sbsp->smk_root) | |
1817 | return -EACCES; | |
2f823ff8 | 1818 | mkp = isp->smk_mmap; |
7898e1f8 | 1819 | |
b17103a8 | 1820 | tsp = smack_cred(current_cred()); |
2f823ff8 | 1821 | skp = smk_of_current(); |
7898e1f8 CS |
1822 | rc = 0; |
1823 | ||
1824 | rcu_read_lock(); | |
1825 | /* | |
1826 | * For each Smack rule associated with the subject | |
1827 | * label verify that the SMACK64MMAP also has access | |
1828 | * to that rule's object label. | |
7898e1f8 | 1829 | */ |
272cd7a8 | 1830 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1831 | okp = srp->smk_object; |
7898e1f8 CS |
1832 | /* |
1833 | * Matching labels always allows access. | |
1834 | */ | |
21c7eae2 | 1835 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1836 | continue; |
0e0a070d CS |
1837 | /* |
1838 | * If there is a matching local rule take | |
1839 | * that into account as well. | |
1840 | */ | |
21c7eae2 LP |
1841 | may = smk_access_entry(srp->smk_subject->smk_known, |
1842 | okp->smk_known, | |
1843 | &tsp->smk_rules); | |
0e0a070d CS |
1844 | if (may == -ENOENT) |
1845 | may = srp->smk_access; | |
1846 | else | |
1847 | may &= srp->smk_access; | |
1848 | /* | |
1849 | * If may is zero the SMACK64MMAP subject can't | |
1850 | * possibly have less access. | |
1851 | */ | |
1852 | if (may == 0) | |
1853 | continue; | |
1854 | ||
1855 | /* | |
1856 | * Fetch the global list entry. | |
1857 | * If there isn't one a SMACK64MMAP subject | |
1858 | * can't have as much access as current. | |
1859 | */ | |
21c7eae2 LP |
1860 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1861 | &mkp->smk_rules); | |
0e0a070d CS |
1862 | if (mmay == -ENOENT) { |
1863 | rc = -EACCES; | |
1864 | break; | |
1865 | } | |
1866 | /* | |
1867 | * If there is a local entry it modifies the | |
1868 | * potential access, too. | |
1869 | */ | |
21c7eae2 LP |
1870 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1871 | &tsp->smk_rules); | |
0e0a070d CS |
1872 | if (tmay != -ENOENT) |
1873 | mmay &= tmay; | |
7898e1f8 | 1874 | |
0e0a070d CS |
1875 | /* |
1876 | * If there is any access available to current that is | |
1877 | * not available to a SMACK64MMAP subject | |
1878 | * deny access. | |
1879 | */ | |
75a25637 | 1880 | if ((may | mmay) != mmay) { |
0e0a070d | 1881 | rc = -EACCES; |
7898e1f8 | 1882 | break; |
0e0a070d | 1883 | } |
7898e1f8 CS |
1884 | } |
1885 | ||
1886 | rcu_read_unlock(); | |
1887 | ||
1888 | return rc; | |
1889 | } | |
1890 | ||
e114e473 CS |
1891 | /** |
1892 | * smack_file_set_fowner - set the file security blob value | |
1893 | * @file: object in question | |
1894 | * | |
e114e473 | 1895 | */ |
e0b93edd | 1896 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1897 | { |
f28952ac CS |
1898 | struct smack_known **blob = smack_file(file); |
1899 | ||
1900 | *blob = smk_of_current(); | |
e114e473 CS |
1901 | } |
1902 | ||
1903 | /** | |
1904 | * smack_file_send_sigiotask - Smack on sigio | |
1905 | * @tsk: The target task | |
1906 | * @fown: the object the signal come from | |
1907 | * @signum: unused | |
1908 | * | |
1909 | * Allow a privileged task to get signals even if it shouldn't | |
1910 | * | |
1911 | * Returns 0 if a subject with the object's smack could | |
1912 | * write to the task, an error code otherwise. | |
1913 | */ | |
1914 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1915 | struct fown_struct *fown, int signum) | |
1916 | { | |
f28952ac | 1917 | struct smack_known **blob; |
2f823ff8 | 1918 | struct smack_known *skp; |
b17103a8 | 1919 | struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred)); |
dcb569cf | 1920 | const struct cred *tcred; |
e114e473 CS |
1921 | struct file *file; |
1922 | int rc; | |
ecfcc53f | 1923 | struct smk_audit_info ad; |
e114e473 CS |
1924 | |
1925 | /* | |
1926 | * struct fown_struct is never outside the context of a struct file | |
1927 | */ | |
1928 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1929 | |
ecfcc53f | 1930 | /* we don't log here as rc can be overriden */ |
f28952ac CS |
1931 | blob = smack_file(file); |
1932 | skp = *blob; | |
c60b9066 CS |
1933 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1934 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1935 | |
1936 | rcu_read_lock(); | |
1937 | tcred = __task_cred(tsk); | |
1938 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1939 | rc = 0; |
dcb569cf | 1940 | rcu_read_unlock(); |
ecfcc53f EB |
1941 | |
1942 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1943 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1944 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1945 | return rc; |
1946 | } | |
1947 | ||
1948 | /** | |
1949 | * smack_file_receive - Smack file receive check | |
1950 | * @file: the object | |
1951 | * | |
1952 | * Returns 0 if current has access, error code otherwise | |
1953 | */ | |
1954 | static int smack_file_receive(struct file *file) | |
1955 | { | |
d166c802 | 1956 | int rc; |
e114e473 | 1957 | int may = 0; |
ecfcc53f | 1958 | struct smk_audit_info ad; |
5e7270a6 | 1959 | struct inode *inode = file_inode(file); |
79be0935 CS |
1960 | struct socket *sock; |
1961 | struct task_smack *tsp; | |
1962 | struct socket_smack *ssp; | |
e114e473 | 1963 | |
9777582e SWK |
1964 | if (unlikely(IS_PRIVATE(inode))) |
1965 | return 0; | |
1966 | ||
4482a44f | 1967 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1968 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1969 | |
51d59af2 | 1970 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1971 | sock = SOCKET_I(inode); |
1972 | ssp = sock->sk->sk_security; | |
b17103a8 | 1973 | tsp = smack_cred(current_cred()); |
79be0935 CS |
1974 | /* |
1975 | * If the receiving process can't write to the | |
1976 | * passed socket or if the passed socket can't | |
1977 | * write to the receiving process don't accept | |
1978 | * the passed socket. | |
1979 | */ | |
1980 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1981 | rc = smk_bu_file(file, may, rc); | |
1982 | if (rc < 0) | |
1983 | return rc; | |
1984 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1985 | rc = smk_bu_file(file, may, rc); | |
1986 | return rc; | |
1987 | } | |
e114e473 CS |
1988 | /* |
1989 | * This code relies on bitmasks. | |
1990 | */ | |
1991 | if (file->f_mode & FMODE_READ) | |
1992 | may = MAY_READ; | |
1993 | if (file->f_mode & FMODE_WRITE) | |
1994 | may |= MAY_WRITE; | |
1995 | ||
5e7270a6 | 1996 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1997 | rc = smk_bu_file(file, may, rc); |
1998 | return rc; | |
e114e473 CS |
1999 | } |
2000 | ||
531f1d45 | 2001 | /** |
83d49856 | 2002 | * smack_file_open - Smack dentry open processing |
531f1d45 | 2003 | * @file: the object |
531f1d45 CS |
2004 | * |
2005 | * Set the security blob in the file structure. | |
a6834c0b CS |
2006 | * Allow the open only if the task has read access. There are |
2007 | * many read operations (e.g. fstat) that you can do with an | |
2008 | * fd even if you have the file open write-only. | |
531f1d45 | 2009 | * |
a1a07f22 | 2010 | * Returns 0 if current has access, error code otherwise |
531f1d45 | 2011 | */ |
94817692 | 2012 | static int smack_file_open(struct file *file) |
531f1d45 | 2013 | { |
b17103a8 | 2014 | struct task_smack *tsp = smack_cred(file->f_cred); |
5e7270a6 | 2015 | struct inode *inode = file_inode(file); |
a6834c0b CS |
2016 | struct smk_audit_info ad; |
2017 | int rc; | |
531f1d45 | 2018 | |
a6834c0b CS |
2019 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
2020 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 2021 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 2022 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
2023 | |
2024 | return rc; | |
531f1d45 CS |
2025 | } |
2026 | ||
e114e473 CS |
2027 | /* |
2028 | * Task hooks | |
2029 | */ | |
2030 | ||
ee18d64c DH |
2031 | /** |
2032 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
a1a07f22 | 2033 | * @cred: the new credentials |
ee18d64c DH |
2034 | * @gfp: the atomicity of any memory allocations |
2035 | * | |
2036 | * Prepare a blank set of credentials for modification. This must allocate all | |
2037 | * the memory the LSM module might require such that cred_transfer() can | |
2038 | * complete without error. | |
2039 | */ | |
2040 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
2041 | { | |
bbd3662a | 2042 | init_task_smack(smack_cred(cred), NULL, NULL); |
ee18d64c DH |
2043 | return 0; |
2044 | } | |
2045 | ||
2046 | ||
e114e473 | 2047 | /** |
f1752eec DH |
2048 | * smack_cred_free - "free" task-level security credentials |
2049 | * @cred: the credentials in question | |
e114e473 | 2050 | * |
e114e473 | 2051 | */ |
f1752eec | 2052 | static void smack_cred_free(struct cred *cred) |
e114e473 | 2053 | { |
b17103a8 | 2054 | struct task_smack *tsp = smack_cred(cred); |
7898e1f8 CS |
2055 | struct smack_rule *rp; |
2056 | struct list_head *l; | |
2057 | struct list_head *n; | |
2058 | ||
38416e53 ZJ |
2059 | smk_destroy_label_list(&tsp->smk_relabel); |
2060 | ||
7898e1f8 CS |
2061 | list_for_each_safe(l, n, &tsp->smk_rules) { |
2062 | rp = list_entry(l, struct smack_rule, list); | |
2063 | list_del(&rp->list); | |
4e328b08 | 2064 | kmem_cache_free(smack_rule_cache, rp); |
7898e1f8 | 2065 | } |
e114e473 CS |
2066 | } |
2067 | ||
d84f4f99 DH |
2068 | /** |
2069 | * smack_cred_prepare - prepare new set of credentials for modification | |
2070 | * @new: the new credentials | |
2071 | * @old: the original credentials | |
2072 | * @gfp: the atomicity of any memory allocations | |
2073 | * | |
2074 | * Prepare a new set of credentials for modification. | |
2075 | */ | |
2076 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2077 | gfp_t gfp) | |
2078 | { | |
b17103a8 | 2079 | struct task_smack *old_tsp = smack_cred(old); |
bbd3662a | 2080 | struct task_smack *new_tsp = smack_cred(new); |
7898e1f8 | 2081 | int rc; |
676dac4b | 2082 | |
bbd3662a | 2083 | init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task); |
b437aba8 | 2084 | |
7898e1f8 CS |
2085 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2086 | if (rc != 0) | |
2087 | return rc; | |
2088 | ||
38416e53 ZJ |
2089 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2090 | gfp); | |
bbd3662a | 2091 | return rc; |
d84f4f99 DH |
2092 | } |
2093 | ||
ee18d64c DH |
2094 | /** |
2095 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2096 | * @new: the new credentials | |
2097 | * @old: the original credentials | |
2098 | * | |
2099 | * Fill in a set of blank credentials from another set of credentials. | |
2100 | */ | |
2101 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2102 | { | |
b17103a8 CS |
2103 | struct task_smack *old_tsp = smack_cred(old); |
2104 | struct task_smack *new_tsp = smack_cred(new); | |
676dac4b | 2105 | |
69b6d710 | 2106 | init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task); |
ee18d64c DH |
2107 | } |
2108 | ||
3ec30113 MG |
2109 | /** |
2110 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
a1a07f22 | 2111 | * @cred: the object creds |
3ec30113 MG |
2112 | * @secid: where to put the result |
2113 | * | |
2114 | * Sets the secid to contain a u32 version of the smack label. | |
2115 | */ | |
b17103a8 | 2116 | static void smack_cred_getsecid(const struct cred *cred, u32 *secid) |
3ec30113 MG |
2117 | { |
2118 | struct smack_known *skp; | |
2119 | ||
2120 | rcu_read_lock(); | |
b17103a8 | 2121 | skp = smk_of_task(smack_cred(cred)); |
3ec30113 MG |
2122 | *secid = skp->smk_secid; |
2123 | rcu_read_unlock(); | |
2124 | } | |
2125 | ||
3a3b7ce9 DH |
2126 | /** |
2127 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2128 | * @new: points to the set of credentials to be modified. |
2129 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2130 | * |
2131 | * Set the security data for a kernel service. | |
2132 | */ | |
2133 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2134 | { | |
b17103a8 | 2135 | struct task_smack *new_tsp = smack_cred(new); |
3a3b7ce9 | 2136 | |
152f91d4 | 2137 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2138 | return 0; |
2139 | } | |
2140 | ||
2141 | /** | |
2142 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2143 | * @new: points to the set of credentials to be modified |
2144 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2145 | * |
2146 | * Set the file creation context in a set of credentials to the same | |
2147 | * as the objective context of the specified inode | |
2148 | */ | |
2149 | static int smack_kernel_create_files_as(struct cred *new, | |
2150 | struct inode *inode) | |
2151 | { | |
fb4021b6 | 2152 | struct inode_smack *isp = smack_inode(inode); |
b17103a8 | 2153 | struct task_smack *tsp = smack_cred(new); |
3a3b7ce9 | 2154 | |
21c7eae2 | 2155 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2156 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2157 | return 0; |
2158 | } | |
2159 | ||
ecfcc53f EB |
2160 | /** |
2161 | * smk_curacc_on_task - helper to log task related access | |
2162 | * @p: the task object | |
531f1d45 CS |
2163 | * @access: the access requested |
2164 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2165 | * |
2166 | * Return 0 if access is permitted | |
2167 | */ | |
531f1d45 CS |
2168 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2169 | const char *caller) | |
ecfcc53f EB |
2170 | { |
2171 | struct smk_audit_info ad; | |
a3727a8b | 2172 | struct smack_known *skp = smk_of_task_struct_obj(p); |
d166c802 | 2173 | int rc; |
ecfcc53f | 2174 | |
531f1d45 | 2175 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2176 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2177 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2178 | rc = smk_bu_task(p, access, rc); |
2179 | return rc; | |
ecfcc53f EB |
2180 | } |
2181 | ||
e114e473 CS |
2182 | /** |
2183 | * smack_task_setpgid - Smack check on setting pgid | |
2184 | * @p: the task object | |
2185 | * @pgid: unused | |
2186 | * | |
2187 | * Return 0 if write access is permitted | |
2188 | */ | |
2189 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2190 | { | |
531f1d45 | 2191 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2192 | } |
2193 | ||
2194 | /** | |
2195 | * smack_task_getpgid - Smack access check for getpgid | |
2196 | * @p: the object task | |
2197 | * | |
2198 | * Returns 0 if current can read the object task, error code otherwise | |
2199 | */ | |
2200 | static int smack_task_getpgid(struct task_struct *p) | |
2201 | { | |
531f1d45 | 2202 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2203 | } |
2204 | ||
2205 | /** | |
2206 | * smack_task_getsid - Smack access check for getsid | |
2207 | * @p: the object task | |
2208 | * | |
2209 | * Returns 0 if current can read the object task, error code otherwise | |
2210 | */ | |
2211 | static int smack_task_getsid(struct task_struct *p) | |
2212 | { | |
531f1d45 | 2213 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2214 | } |
2215 | ||
2216 | /** | |
6326948f | 2217 | * smack_current_getsecid_subj - get the subjective secid of the current task |
e114e473 CS |
2218 | * @secid: where to put the result |
2219 | * | |
1fb057dc PM |
2220 | * Sets the secid to contain a u32 version of the task's subjective smack label. |
2221 | */ | |
6326948f | 2222 | static void smack_current_getsecid_subj(u32 *secid) |
1fb057dc | 2223 | { |
6326948f | 2224 | struct smack_known *skp = smk_of_current(); |
1fb057dc PM |
2225 | |
2226 | *secid = skp->smk_secid; | |
2227 | } | |
2228 | ||
2229 | /** | |
2230 | * smack_task_getsecid_obj - get the objective secid of the task | |
2231 | * @p: the task | |
2232 | * @secid: where to put the result | |
2233 | * | |
2234 | * Sets the secid to contain a u32 version of the task's objective smack label. | |
e114e473 | 2235 | */ |
1fb057dc | 2236 | static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid) |
e114e473 | 2237 | { |
1fb057dc | 2238 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 CS |
2239 | |
2240 | *secid = skp->smk_secid; | |
e114e473 CS |
2241 | } |
2242 | ||
2243 | /** | |
2244 | * smack_task_setnice - Smack check on setting nice | |
2245 | * @p: the task object | |
2246 | * @nice: unused | |
2247 | * | |
2248 | * Return 0 if write access is permitted | |
2249 | */ | |
2250 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2251 | { | |
b1d9e6b0 | 2252 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2253 | } |
2254 | ||
2255 | /** | |
2256 | * smack_task_setioprio - Smack check on setting ioprio | |
2257 | * @p: the task object | |
2258 | * @ioprio: unused | |
2259 | * | |
2260 | * Return 0 if write access is permitted | |
2261 | */ | |
2262 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2263 | { | |
b1d9e6b0 | 2264 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2265 | } |
2266 | ||
2267 | /** | |
2268 | * smack_task_getioprio - Smack check on reading ioprio | |
2269 | * @p: the task object | |
2270 | * | |
2271 | * Return 0 if read access is permitted | |
2272 | */ | |
2273 | static int smack_task_getioprio(struct task_struct *p) | |
2274 | { | |
531f1d45 | 2275 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2276 | } |
2277 | ||
2278 | /** | |
2279 | * smack_task_setscheduler - Smack check on setting scheduler | |
2280 | * @p: the task object | |
e114e473 CS |
2281 | * |
2282 | * Return 0 if read access is permitted | |
2283 | */ | |
b0ae1981 | 2284 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2285 | { |
b1d9e6b0 | 2286 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2287 | } |
2288 | ||
2289 | /** | |
2290 | * smack_task_getscheduler - Smack check on reading scheduler | |
2291 | * @p: the task object | |
2292 | * | |
2293 | * Return 0 if read access is permitted | |
2294 | */ | |
2295 | static int smack_task_getscheduler(struct task_struct *p) | |
2296 | { | |
531f1d45 | 2297 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2298 | } |
2299 | ||
2300 | /** | |
2301 | * smack_task_movememory - Smack check on moving memory | |
2302 | * @p: the task object | |
2303 | * | |
2304 | * Return 0 if write access is permitted | |
2305 | */ | |
2306 | static int smack_task_movememory(struct task_struct *p) | |
2307 | { | |
531f1d45 | 2308 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2309 | } |
2310 | ||
2311 | /** | |
2312 | * smack_task_kill - Smack check on signal delivery | |
2313 | * @p: the task object | |
2314 | * @info: unused | |
2315 | * @sig: unused | |
6b4f3d01 | 2316 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2317 | * |
2318 | * Return 0 if write access is permitted | |
2319 | * | |
e114e473 | 2320 | */ |
ae7795bc | 2321 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2322 | int sig, const struct cred *cred) |
e114e473 | 2323 | { |
ecfcc53f | 2324 | struct smk_audit_info ad; |
2f823ff8 | 2325 | struct smack_known *skp; |
1fb057dc | 2326 | struct smack_known *tkp = smk_of_task_struct_obj(p); |
d166c802 | 2327 | int rc; |
ecfcc53f | 2328 | |
18d872f7 RK |
2329 | if (!sig) |
2330 | return 0; /* null signal; existence test */ | |
2331 | ||
ecfcc53f EB |
2332 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2333 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2334 | /* |
2335 | * Sending a signal requires that the sender | |
2336 | * can write the receiver. | |
2337 | */ | |
6b4f3d01 | 2338 | if (cred == NULL) { |
c60b9066 CS |
2339 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2340 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2341 | return rc; |
2342 | } | |
e114e473 | 2343 | /* |
6b4f3d01 | 2344 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2345 | * specific behavior. This is not clean. For one thing |
2346 | * we can't take privilege into account. | |
2347 | */ | |
b17103a8 | 2348 | skp = smk_of_task(smack_cred(cred)); |
c60b9066 CS |
2349 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2350 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2351 | return rc; |
e114e473 CS |
2352 | } |
2353 | ||
e114e473 CS |
2354 | /** |
2355 | * smack_task_to_inode - copy task smack into the inode blob | |
2356 | * @p: task to copy from | |
251a2a95 | 2357 | * @inode: inode to copy to |
e114e473 CS |
2358 | * |
2359 | * Sets the smack pointer in the inode security blob | |
2360 | */ | |
2361 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2362 | { | |
fb4021b6 | 2363 | struct inode_smack *isp = smack_inode(inode); |
1fb057dc | 2364 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 | 2365 | |
21c7eae2 | 2366 | isp->smk_inode = skp; |
7b4e8843 | 2367 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2368 | } |
2369 | ||
2370 | /* | |
2371 | * Socket hooks. | |
2372 | */ | |
2373 | ||
2374 | /** | |
2375 | * smack_sk_alloc_security - Allocate a socket blob | |
2376 | * @sk: the socket | |
2377 | * @family: unused | |
251a2a95 | 2378 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2379 | * |
2380 | * Assign Smack pointers to current | |
2381 | * | |
2382 | * Returns 0 on success, -ENOMEM is there's no memory | |
2383 | */ | |
2384 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2385 | { | |
2f823ff8 | 2386 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2387 | struct socket_smack *ssp; |
2388 | ||
2389 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2390 | if (ssp == NULL) | |
2391 | return -ENOMEM; | |
2392 | ||
08382c9f | 2393 | /* |
2394 | * Sockets created by kernel threads receive web label. | |
2395 | */ | |
2396 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2397 | ssp->smk_in = &smack_known_web; | |
2398 | ssp->smk_out = &smack_known_web; | |
2399 | } else { | |
2400 | ssp->smk_in = skp; | |
2401 | ssp->smk_out = skp; | |
2402 | } | |
272cd7a8 | 2403 | ssp->smk_packet = NULL; |
e114e473 CS |
2404 | |
2405 | sk->sk_security = ssp; | |
2406 | ||
2407 | return 0; | |
2408 | } | |
2409 | ||
2410 | /** | |
2411 | * smack_sk_free_security - Free a socket blob | |
2412 | * @sk: the socket | |
2413 | * | |
2414 | * Clears the blob pointer | |
2415 | */ | |
2416 | static void smack_sk_free_security(struct sock *sk) | |
2417 | { | |
0c96d1f5 VG |
2418 | #ifdef SMACK_IPV6_PORT_LABELING |
2419 | struct smk_port_label *spp; | |
2420 | ||
2421 | if (sk->sk_family == PF_INET6) { | |
2422 | rcu_read_lock(); | |
2423 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2424 | if (spp->smk_sock != sk) | |
2425 | continue; | |
2426 | spp->smk_can_reuse = 1; | |
2427 | break; | |
2428 | } | |
2429 | rcu_read_unlock(); | |
2430 | } | |
2431 | #endif | |
e114e473 CS |
2432 | kfree(sk->sk_security); |
2433 | } | |
2434 | ||
4ca165fc LM |
2435 | /** |
2436 | * smack_sk_clone_security - Copy security context | |
2437 | * @sk: the old socket | |
2438 | * @newsk: the new socket | |
2439 | * | |
2440 | * Copy the security context of the old socket pointer to the cloned | |
2441 | */ | |
2442 | static void smack_sk_clone_security(const struct sock *sk, struct sock *newsk) | |
2443 | { | |
2444 | struct socket_smack *ssp_old = sk->sk_security; | |
2445 | struct socket_smack *ssp_new = newsk->sk_security; | |
2446 | ||
2447 | *ssp_new = *ssp_old; | |
2448 | } | |
2449 | ||
07feee8f | 2450 | /** |
21abb1ec | 2451 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2452 | * @sip: the object end |
2453 | * | |
2454 | * looks for host based access restrictions | |
2455 | * | |
2456 | * This version will only be appropriate for really small sets of single label | |
2457 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2458 | * taken before calling this function. | |
2459 | * | |
2460 | * Returns the label of the far end or NULL if it's not special. | |
2461 | */ | |
21abb1ec | 2462 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2463 | { |
21abb1ec | 2464 | struct smk_net4addr *snp; |
07feee8f PM |
2465 | struct in_addr *siap = &sip->sin_addr; |
2466 | ||
2467 | if (siap->s_addr == 0) | |
2468 | return NULL; | |
2469 | ||
21abb1ec CS |
2470 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2471 | /* | |
2472 | * we break after finding the first match because | |
2473 | * the list is sorted from longest to shortest mask | |
2474 | * so we have found the most specific match | |
2475 | */ | |
2476 | if (snp->smk_host.s_addr == | |
2477 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2478 | return snp->smk_label; | |
2479 | ||
2480 | return NULL; | |
2481 | } | |
2482 | ||
21abb1ec CS |
2483 | /* |
2484 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2485 | * @sip: the address | |
2486 | * | |
2487 | * Returns boolean true if this is the localhost address | |
2488 | */ | |
2489 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2490 | { | |
2491 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2492 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2493 | ||
2494 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2495 | ntohs(be16p[7]) == 1) | |
2496 | return true; | |
2497 | return false; | |
2498 | } | |
2499 | ||
2500 | /** | |
2501 | * smack_ipv6host_label - check host based restrictions | |
2502 | * @sip: the object end | |
2503 | * | |
2504 | * looks for host based access restrictions | |
2505 | * | |
2506 | * This version will only be appropriate for really small sets of single label | |
2507 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2508 | * taken before calling this function. | |
2509 | * | |
2510 | * Returns the label of the far end or NULL if it's not special. | |
2511 | */ | |
2512 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2513 | { | |
2514 | struct smk_net6addr *snp; | |
2515 | struct in6_addr *sap = &sip->sin6_addr; | |
2516 | int i; | |
2517 | int found = 0; | |
2518 | ||
2519 | /* | |
2520 | * It's local. Don't look for a host label. | |
2521 | */ | |
2522 | if (smk_ipv6_localhost(sip)) | |
2523 | return NULL; | |
2524 | ||
2525 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2526 | /* |
2527 | * If the label is NULL the entry has | |
2528 | * been renounced. Ignore it. | |
2529 | */ | |
2530 | if (snp->smk_label == NULL) | |
2531 | continue; | |
07feee8f PM |
2532 | /* |
2533 | * we break after finding the first match because | |
2534 | * the list is sorted from longest to shortest mask | |
2535 | * so we have found the most specific match | |
2536 | */ | |
21abb1ec | 2537 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2538 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2539 | snp->smk_host.s6_addr16[i]) { | |
2540 | found = 0; | |
2541 | break; | |
2542 | } | |
4303154e | 2543 | } |
21abb1ec CS |
2544 | if (found) |
2545 | return snp->smk_label; | |
2546 | } | |
07feee8f PM |
2547 | |
2548 | return NULL; | |
2549 | } | |
2550 | ||
e114e473 | 2551 | /** |
a2af0318 | 2552 | * smack_netlbl_add - Set the secattr on a socket |
e114e473 CS |
2553 | * @sk: the socket |
2554 | * | |
a2af0318 | 2555 | * Attach the outbound smack value (smk_out) to the socket. |
e114e473 CS |
2556 | * |
2557 | * Returns 0 on success or an error code | |
2558 | */ | |
a2af0318 | 2559 | static int smack_netlbl_add(struct sock *sk) |
e114e473 | 2560 | { |
07feee8f | 2561 | struct socket_smack *ssp = sk->sk_security; |
a2af0318 CS |
2562 | struct smack_known *skp = ssp->smk_out; |
2563 | int rc; | |
e114e473 | 2564 | |
6d3dc07c CS |
2565 | local_bh_disable(); |
2566 | bh_lock_sock_nested(sk); | |
2567 | ||
8ec9897e DC |
2568 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel, |
2569 | netlbl_sk_lock_check(sk)); | |
a2af0318 CS |
2570 | switch (rc) { |
2571 | case 0: | |
2572 | ssp->smk_state = SMK_NETLBL_LABELED; | |
2573 | break; | |
2574 | case -EDESTADDRREQ: | |
2575 | ssp->smk_state = SMK_NETLBL_REQSKB; | |
2576 | rc = 0; | |
2577 | break; | |
6d3dc07c CS |
2578 | } |
2579 | ||
2580 | bh_unlock_sock(sk); | |
2581 | local_bh_enable(); | |
4bc87e62 | 2582 | |
e114e473 CS |
2583 | return rc; |
2584 | } | |
2585 | ||
07feee8f | 2586 | /** |
a2af0318 CS |
2587 | * smack_netlbl_delete - Remove the secattr from a socket |
2588 | * @sk: the socket | |
2589 | * | |
2590 | * Remove the outbound smack value from a socket | |
2591 | */ | |
2592 | static void smack_netlbl_delete(struct sock *sk) | |
2593 | { | |
2594 | struct socket_smack *ssp = sk->sk_security; | |
2595 | ||
2596 | /* | |
2597 | * Take the label off the socket if one is set. | |
2598 | */ | |
2599 | if (ssp->smk_state != SMK_NETLBL_LABELED) | |
2600 | return; | |
2601 | ||
2602 | local_bh_disable(); | |
2603 | bh_lock_sock_nested(sk); | |
2604 | netlbl_sock_delattr(sk); | |
2605 | bh_unlock_sock(sk); | |
2606 | local_bh_enable(); | |
2607 | ssp->smk_state = SMK_NETLBL_UNLABELED; | |
2608 | } | |
2609 | ||
2610 | /** | |
2611 | * smk_ipv4_check - Perform IPv4 host access checks | |
07feee8f PM |
2612 | * @sk: the socket |
2613 | * @sap: the destination address | |
2614 | * | |
2615 | * Set the correct secattr for the given socket based on the destination | |
2616 | * address and perform any outbound access checks needed. | |
2617 | * | |
2618 | * Returns 0 on success or an error code. | |
2619 | * | |
2620 | */ | |
a2af0318 | 2621 | static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap) |
07feee8f | 2622 | { |
2f823ff8 | 2623 | struct smack_known *skp; |
a2af0318 | 2624 | int rc = 0; |
21c7eae2 | 2625 | struct smack_known *hkp; |
07feee8f | 2626 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2627 | struct smk_audit_info ad; |
07feee8f PM |
2628 | |
2629 | rcu_read_lock(); | |
21abb1ec | 2630 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2631 | if (hkp != NULL) { |
ecfcc53f | 2632 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2633 | struct lsm_network_audit net; |
2634 | ||
48c62af6 EP |
2635 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2636 | ad.a.u.net->family = sap->sin_family; | |
2637 | ad.a.u.net->dport = sap->sin_port; | |
2638 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2639 | #endif |
2f823ff8 | 2640 | skp = ssp->smk_out; |
21c7eae2 LP |
2641 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2642 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
a2af0318 CS |
2643 | /* |
2644 | * Clear the socket netlabel if it's set. | |
2645 | */ | |
2646 | if (!rc) | |
2647 | smack_netlbl_delete(sk); | |
07feee8f PM |
2648 | } |
2649 | rcu_read_unlock(); | |
07feee8f | 2650 | |
a2af0318 | 2651 | return rc; |
07feee8f PM |
2652 | } |
2653 | ||
21abb1ec CS |
2654 | /** |
2655 | * smk_ipv6_check - check Smack access | |
2656 | * @subject: subject Smack label | |
2657 | * @object: object Smack label | |
2658 | * @address: address | |
2659 | * @act: the action being taken | |
2660 | * | |
2661 | * Check an IPv6 access | |
2662 | */ | |
2663 | static int smk_ipv6_check(struct smack_known *subject, | |
2664 | struct smack_known *object, | |
2665 | struct sockaddr_in6 *address, int act) | |
2666 | { | |
2667 | #ifdef CONFIG_AUDIT | |
2668 | struct lsm_network_audit net; | |
2669 | #endif | |
2670 | struct smk_audit_info ad; | |
2671 | int rc; | |
2672 | ||
2673 | #ifdef CONFIG_AUDIT | |
2674 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2675 | ad.a.u.net->family = PF_INET6; | |
a5cd1ab7 | 2676 | ad.a.u.net->dport = address->sin6_port; |
21abb1ec CS |
2677 | if (act == SMK_RECEIVING) |
2678 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2679 | else | |
2680 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2681 | #endif | |
2682 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2683 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2684 | return rc; | |
2685 | } | |
21abb1ec CS |
2686 | |
2687 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2688 | /** |
2689 | * smk_ipv6_port_label - Smack port access table management | |
2690 | * @sock: socket | |
2691 | * @address: address | |
2692 | * | |
2693 | * Create or update the port list entry | |
2694 | */ | |
2695 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2696 | { | |
2697 | struct sock *sk = sock->sk; | |
2698 | struct sockaddr_in6 *addr6; | |
2699 | struct socket_smack *ssp = sock->sk->sk_security; | |
2700 | struct smk_port_label *spp; | |
2701 | unsigned short port = 0; | |
2702 | ||
2703 | if (address == NULL) { | |
2704 | /* | |
2705 | * This operation is changing the Smack information | |
2706 | * on the bound socket. Take the changes to the port | |
2707 | * as well. | |
2708 | */ | |
3c7ce342 VG |
2709 | rcu_read_lock(); |
2710 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2711 | if (sk != spp->smk_sock) |
2712 | continue; | |
2713 | spp->smk_in = ssp->smk_in; | |
2714 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2715 | rcu_read_unlock(); |
c6739443 CS |
2716 | return; |
2717 | } | |
2718 | /* | |
2719 | * A NULL address is only used for updating existing | |
2720 | * bound entries. If there isn't one, it's OK. | |
2721 | */ | |
3c7ce342 | 2722 | rcu_read_unlock(); |
c6739443 CS |
2723 | return; |
2724 | } | |
2725 | ||
2726 | addr6 = (struct sockaddr_in6 *)address; | |
2727 | port = ntohs(addr6->sin6_port); | |
2728 | /* | |
2729 | * This is a special case that is safely ignored. | |
2730 | */ | |
2731 | if (port == 0) | |
2732 | return; | |
2733 | ||
2734 | /* | |
2735 | * Look for an existing port list entry. | |
2736 | * This is an indication that a port is getting reused. | |
2737 | */ | |
3c7ce342 VG |
2738 | rcu_read_lock(); |
2739 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2740 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2741 | continue; |
0c96d1f5 VG |
2742 | if (spp->smk_can_reuse != 1) { |
2743 | rcu_read_unlock(); | |
2744 | return; | |
2745 | } | |
c6739443 CS |
2746 | spp->smk_port = port; |
2747 | spp->smk_sock = sk; | |
2748 | spp->smk_in = ssp->smk_in; | |
2749 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2750 | spp->smk_can_reuse = 0; |
3c7ce342 | 2751 | rcu_read_unlock(); |
c6739443 CS |
2752 | return; |
2753 | } | |
3c7ce342 | 2754 | rcu_read_unlock(); |
c6739443 CS |
2755 | /* |
2756 | * A new port entry is required. | |
2757 | */ | |
2758 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2759 | if (spp == NULL) | |
2760 | return; | |
2761 | ||
2762 | spp->smk_port = port; | |
2763 | spp->smk_sock = sk; | |
2764 | spp->smk_in = ssp->smk_in; | |
2765 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2766 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2767 | spp->smk_can_reuse = 0; |
c6739443 | 2768 | |
3c7ce342 VG |
2769 | mutex_lock(&smack_ipv6_lock); |
2770 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2771 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2772 | return; |
2773 | } | |
2774 | ||
2775 | /** | |
2776 | * smk_ipv6_port_check - check Smack port access | |
a1a07f22 | 2777 | * @sk: socket |
c6739443 | 2778 | * @address: address |
a1a07f22 | 2779 | * @act: the action being taken |
c6739443 CS |
2780 | * |
2781 | * Create or update the port list entry | |
2782 | */ | |
6ea06247 | 2783 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2784 | int act) |
2785 | { | |
c6739443 CS |
2786 | struct smk_port_label *spp; |
2787 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2788 | struct smack_known *skp = NULL; |
2789 | unsigned short port; | |
21c7eae2 | 2790 | struct smack_known *object; |
c6739443 CS |
2791 | |
2792 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2793 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2794 | object = ssp->smk_in; |
c6739443 | 2795 | } else { |
2f823ff8 | 2796 | skp = ssp->smk_out; |
21abb1ec | 2797 | object = smack_ipv6host_label(address); |
c6739443 CS |
2798 | } |
2799 | ||
2800 | /* | |
21abb1ec | 2801 | * The other end is a single label host. |
c6739443 | 2802 | */ |
21abb1ec CS |
2803 | if (skp != NULL && object != NULL) |
2804 | return smk_ipv6_check(skp, object, address, act); | |
2805 | if (skp == NULL) | |
2806 | skp = smack_net_ambient; | |
2807 | if (object == NULL) | |
2808 | object = smack_net_ambient; | |
c6739443 CS |
2809 | |
2810 | /* | |
2811 | * It's remote, so port lookup does no good. | |
2812 | */ | |
21abb1ec CS |
2813 | if (!smk_ipv6_localhost(address)) |
2814 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2815 | |
2816 | /* | |
2817 | * It's local so the send check has to have passed. | |
2818 | */ | |
21abb1ec CS |
2819 | if (act == SMK_RECEIVING) |
2820 | return 0; | |
c6739443 | 2821 | |
21abb1ec | 2822 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2823 | rcu_read_lock(); |
2824 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2825 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2826 | continue; |
21c7eae2 | 2827 | object = spp->smk_in; |
c6739443 | 2828 | if (act == SMK_CONNECTING) |
54e70ec5 | 2829 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2830 | break; |
2831 | } | |
3c7ce342 | 2832 | rcu_read_unlock(); |
c6739443 | 2833 | |
21abb1ec | 2834 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2835 | } |
222a96b3 | 2836 | #endif |
c6739443 | 2837 | |
e114e473 CS |
2838 | /** |
2839 | * smack_inode_setsecurity - set smack xattrs | |
2840 | * @inode: the object | |
2841 | * @name: attribute name | |
2842 | * @value: attribute value | |
2843 | * @size: size of the attribute | |
2844 | * @flags: unused | |
2845 | * | |
2846 | * Sets the named attribute in the appropriate blob | |
2847 | * | |
2848 | * Returns 0 on success, or an error code | |
2849 | */ | |
2850 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2851 | const void *value, size_t size, int flags) | |
2852 | { | |
2f823ff8 | 2853 | struct smack_known *skp; |
fb4021b6 | 2854 | struct inode_smack *nsp = smack_inode(inode); |
e114e473 CS |
2855 | struct socket_smack *ssp; |
2856 | struct socket *sock; | |
4bc87e62 | 2857 | int rc = 0; |
e114e473 | 2858 | |
f7112e6c | 2859 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2860 | return -EINVAL; |
e114e473 | 2861 | |
ac02f007 RS |
2862 | if (strcmp(name, XATTR_SMACK_TRANSMUTE) == 0) { |
2863 | if (!S_ISDIR(inode->i_mode) || size != TRANS_TRUE_SIZE || | |
2864 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
2865 | return -EINVAL; | |
2866 | ||
2867 | nsp->smk_flags |= SMK_INODE_TRANSMUTE; | |
2868 | return 0; | |
2869 | } | |
2870 | ||
2f823ff8 | 2871 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2872 | if (IS_ERR(skp)) |
2873 | return PTR_ERR(skp); | |
e114e473 CS |
2874 | |
2875 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2876 | nsp->smk_inode = skp; |
ddd29ec6 | 2877 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2878 | return 0; |
2879 | } | |
2880 | /* | |
2881 | * The rest of the Smack xattrs are only on sockets. | |
2882 | */ | |
2883 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2884 | return -EOPNOTSUPP; | |
2885 | ||
2886 | sock = SOCKET_I(inode); | |
2e1d146a | 2887 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2888 | return -EOPNOTSUPP; |
2889 | ||
2890 | ssp = sock->sk->sk_security; | |
2891 | ||
2892 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2893 | ssp->smk_in = skp; |
e114e473 | 2894 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2895 | ssp->smk_out = skp; |
c6739443 | 2896 | if (sock->sk->sk_family == PF_INET) { |
a2af0318 | 2897 | rc = smack_netlbl_add(sock->sk); |
b4e0d5f0 CS |
2898 | if (rc != 0) |
2899 | printk(KERN_WARNING | |
2900 | "Smack: \"%s\" netlbl error %d.\n", | |
2901 | __func__, -rc); | |
2902 | } | |
e114e473 CS |
2903 | } else |
2904 | return -EOPNOTSUPP; | |
2905 | ||
21abb1ec | 2906 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2907 | if (sock->sk->sk_family == PF_INET6) |
2908 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2909 | #endif |
c6739443 | 2910 | |
e114e473 CS |
2911 | return 0; |
2912 | } | |
2913 | ||
2914 | /** | |
2915 | * smack_socket_post_create - finish socket setup | |
2916 | * @sock: the socket | |
2917 | * @family: protocol family | |
2918 | * @type: unused | |
2919 | * @protocol: unused | |
2920 | * @kern: unused | |
2921 | * | |
2922 | * Sets the netlabel information on the socket | |
2923 | * | |
2924 | * Returns 0 on success, and error code otherwise | |
2925 | */ | |
2926 | static int smack_socket_post_create(struct socket *sock, int family, | |
2927 | int type, int protocol, int kern) | |
2928 | { | |
7412301b ML |
2929 | struct socket_smack *ssp; |
2930 | ||
2931 | if (sock->sk == NULL) | |
2932 | return 0; | |
2933 | ||
2934 | /* | |
2935 | * Sockets created by kernel threads receive web label. | |
2936 | */ | |
2937 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2938 | ssp = sock->sk->sk_security; | |
2939 | ssp->smk_in = &smack_known_web; | |
2940 | ssp->smk_out = &smack_known_web; | |
2941 | } | |
2942 | ||
2943 | if (family != PF_INET) | |
e114e473 CS |
2944 | return 0; |
2945 | /* | |
2946 | * Set the outbound netlbl. | |
2947 | */ | |
a2af0318 | 2948 | return smack_netlbl_add(sock->sk); |
6d3dc07c CS |
2949 | } |
2950 | ||
5859cdf5 TG |
2951 | /** |
2952 | * smack_socket_socketpair - create socket pair | |
2953 | * @socka: one socket | |
2954 | * @sockb: another socket | |
2955 | * | |
2956 | * Cross reference the peer labels for SO_PEERSEC | |
2957 | * | |
a1a07f22 | 2958 | * Returns 0 |
5859cdf5 TG |
2959 | */ |
2960 | static int smack_socket_socketpair(struct socket *socka, | |
2961 | struct socket *sockb) | |
2962 | { | |
2963 | struct socket_smack *asp = socka->sk->sk_security; | |
2964 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2965 | ||
2966 | asp->smk_packet = bsp->smk_out; | |
2967 | bsp->smk_packet = asp->smk_out; | |
2968 | ||
2969 | return 0; | |
2970 | } | |
2971 | ||
21abb1ec | 2972 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2973 | /** |
2974 | * smack_socket_bind - record port binding information. | |
2975 | * @sock: the socket | |
2976 | * @address: the port address | |
2977 | * @addrlen: size of the address | |
2978 | * | |
2979 | * Records the label bound to a port. | |
2980 | * | |
b9ef5513 | 2981 | * Returns 0 on success, and error code otherwise |
c6739443 CS |
2982 | */ |
2983 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2984 | int addrlen) | |
2985 | { | |
b9ef5513 TH |
2986 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) { |
2987 | if (addrlen < SIN6_LEN_RFC2133 || | |
2988 | address->sa_family != AF_INET6) | |
2989 | return -EINVAL; | |
c6739443 | 2990 | smk_ipv6_port_label(sock, address); |
b9ef5513 | 2991 | } |
c6739443 CS |
2992 | return 0; |
2993 | } | |
21abb1ec | 2994 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2995 | |
6d3dc07c CS |
2996 | /** |
2997 | * smack_socket_connect - connect access check | |
2998 | * @sock: the socket | |
2999 | * @sap: the other end | |
3000 | * @addrlen: size of sap | |
3001 | * | |
3002 | * Verifies that a connection may be possible | |
3003 | * | |
3004 | * Returns 0 on success, and error code otherwise | |
3005 | */ | |
3006 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
3007 | int addrlen) | |
3008 | { | |
c6739443 CS |
3009 | int rc = 0; |
3010 | ||
3011 | if (sock->sk == NULL) | |
6d3dc07c | 3012 | return 0; |
87fbfffc CS |
3013 | if (sock->sk->sk_family != PF_INET && |
3014 | (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6)) | |
3015 | return 0; | |
3016 | if (addrlen < offsetofend(struct sockaddr, sa_family)) | |
3017 | return 0; | |
3018 | if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) { | |
3019 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
00720f0e | 3020 | struct smack_known *rsp = NULL; |
da49b5da | 3021 | |
87fbfffc CS |
3022 | if (addrlen < SIN6_LEN_RFC2133) |
3023 | return 0; | |
00720f0e AB |
3024 | if (__is_defined(SMACK_IPV6_SECMARK_LABELING)) |
3025 | rsp = smack_ipv6host_label(sip); | |
87fbfffc CS |
3026 | if (rsp != NULL) { |
3027 | struct socket_smack *ssp = sock->sk->sk_security; | |
3028 | ||
21abb1ec | 3029 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, |
87fbfffc CS |
3030 | SMK_CONNECTING); |
3031 | } | |
222a96b3 SAS |
3032 | #ifdef SMACK_IPV6_PORT_LABELING |
3033 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
3034 | #endif | |
00720f0e | 3035 | |
87fbfffc | 3036 | return rc; |
c6739443 | 3037 | } |
87fbfffc CS |
3038 | if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in)) |
3039 | return 0; | |
a2af0318 | 3040 | rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap); |
c6739443 | 3041 | return rc; |
e114e473 CS |
3042 | } |
3043 | ||
3044 | /** | |
3045 | * smack_flags_to_may - convert S_ to MAY_ values | |
3046 | * @flags: the S_ value | |
3047 | * | |
3048 | * Returns the equivalent MAY_ value | |
3049 | */ | |
3050 | static int smack_flags_to_may(int flags) | |
3051 | { | |
3052 | int may = 0; | |
3053 | ||
3054 | if (flags & S_IRUGO) | |
3055 | may |= MAY_READ; | |
3056 | if (flags & S_IWUGO) | |
3057 | may |= MAY_WRITE; | |
3058 | if (flags & S_IXUGO) | |
3059 | may |= MAY_EXEC; | |
3060 | ||
3061 | return may; | |
3062 | } | |
3063 | ||
3064 | /** | |
3065 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
3066 | * @msg: the object | |
3067 | * | |
3068 | * Returns 0 | |
3069 | */ | |
3070 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
3071 | { | |
ecd5f82e | 3072 | struct smack_known **blob = smack_msg_msg(msg); |
2f823ff8 | 3073 | |
ecd5f82e | 3074 | *blob = smk_of_current(); |
e114e473 CS |
3075 | return 0; |
3076 | } | |
3077 | ||
e114e473 | 3078 | /** |
0d79cbf8 EB |
3079 | * smack_of_ipc - the smack pointer for the ipc |
3080 | * @isp: the object | |
e114e473 CS |
3081 | * |
3082 | * Returns a pointer to the smack value | |
3083 | */ | |
0d79cbf8 | 3084 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 3085 | { |
019bcca4 CS |
3086 | struct smack_known **blob = smack_ipc(isp); |
3087 | ||
3088 | return *blob; | |
e114e473 CS |
3089 | } |
3090 | ||
3091 | /** | |
0d79cbf8 EB |
3092 | * smack_ipc_alloc_security - Set the security blob for ipc |
3093 | * @isp: the object | |
e114e473 CS |
3094 | * |
3095 | * Returns 0 | |
3096 | */ | |
0d79cbf8 | 3097 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 3098 | { |
019bcca4 | 3099 | struct smack_known **blob = smack_ipc(isp); |
e114e473 | 3100 | |
019bcca4 | 3101 | *blob = smk_of_current(); |
e114e473 CS |
3102 | return 0; |
3103 | } | |
3104 | ||
ecfcc53f EB |
3105 | /** |
3106 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 3107 | * @isp : the object |
ecfcc53f EB |
3108 | * @access : access requested |
3109 | * | |
3110 | * Returns 0 if current has the requested access, error code otherwise | |
3111 | */ | |
0d79cbf8 | 3112 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3113 | { |
0d79cbf8 | 3114 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3115 | struct smk_audit_info ad; |
d166c802 | 3116 | int rc; |
ecfcc53f EB |
3117 | |
3118 | #ifdef CONFIG_AUDIT | |
3119 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3120 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3121 | #endif |
d166c802 CS |
3122 | rc = smk_curacc(ssp, access, &ad); |
3123 | rc = smk_bu_current("shm", ssp, access, rc); | |
3124 | return rc; | |
ecfcc53f EB |
3125 | } |
3126 | ||
e114e473 CS |
3127 | /** |
3128 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 3129 | * @isp: the object |
e114e473 CS |
3130 | * @shmflg: access requested |
3131 | * | |
3132 | * Returns 0 if current has the requested access, error code otherwise | |
3133 | */ | |
0d79cbf8 | 3134 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3135 | { |
e114e473 CS |
3136 | int may; |
3137 | ||
3138 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3139 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3140 | } |
3141 | ||
3142 | /** | |
3143 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3144 | * @isp: the object |
e114e473 CS |
3145 | * @cmd: what it wants to do |
3146 | * | |
3147 | * Returns 0 if current has the requested access, error code otherwise | |
3148 | */ | |
0d79cbf8 | 3149 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3150 | { |
e114e473 CS |
3151 | int may; |
3152 | ||
3153 | switch (cmd) { | |
3154 | case IPC_STAT: | |
3155 | case SHM_STAT: | |
c21a6970 | 3156 | case SHM_STAT_ANY: |
e114e473 CS |
3157 | may = MAY_READ; |
3158 | break; | |
3159 | case IPC_SET: | |
3160 | case SHM_LOCK: | |
3161 | case SHM_UNLOCK: | |
3162 | case IPC_RMID: | |
3163 | may = MAY_READWRITE; | |
3164 | break; | |
3165 | case IPC_INFO: | |
3166 | case SHM_INFO: | |
3167 | /* | |
3168 | * System level information. | |
3169 | */ | |
3170 | return 0; | |
3171 | default: | |
3172 | return -EINVAL; | |
3173 | } | |
0d79cbf8 | 3174 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3175 | } |
3176 | ||
3177 | /** | |
3178 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3179 | * @isp: the object |
e114e473 CS |
3180 | * @shmaddr: unused |
3181 | * @shmflg: access requested | |
3182 | * | |
3183 | * Returns 0 if current has the requested access, error code otherwise | |
3184 | */ | |
a1a07f22 | 3185 | static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr, |
e114e473 CS |
3186 | int shmflg) |
3187 | { | |
e114e473 CS |
3188 | int may; |
3189 | ||
3190 | may = smack_flags_to_may(shmflg); | |
a1a07f22 | 3191 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3192 | } |
3193 | ||
ecfcc53f EB |
3194 | /** |
3195 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3196 | * @isp : the object |
ecfcc53f EB |
3197 | * @access : access requested |
3198 | * | |
3199 | * Returns 0 if current has the requested access, error code otherwise | |
3200 | */ | |
0d79cbf8 | 3201 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3202 | { |
0d79cbf8 | 3203 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3204 | struct smk_audit_info ad; |
d166c802 | 3205 | int rc; |
ecfcc53f EB |
3206 | |
3207 | #ifdef CONFIG_AUDIT | |
3208 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3209 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3210 | #endif |
d166c802 CS |
3211 | rc = smk_curacc(ssp, access, &ad); |
3212 | rc = smk_bu_current("sem", ssp, access, rc); | |
3213 | return rc; | |
ecfcc53f EB |
3214 | } |
3215 | ||
e114e473 CS |
3216 | /** |
3217 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3218 | * @isp: the object |
e114e473 CS |
3219 | * @semflg: access requested |
3220 | * | |
3221 | * Returns 0 if current has the requested access, error code otherwise | |
3222 | */ | |
0d79cbf8 | 3223 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3224 | { |
e114e473 CS |
3225 | int may; |
3226 | ||
3227 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3228 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3229 | } |
3230 | ||
3231 | /** | |
b57d0209 | 3232 | * smack_sem_semctl - Smack access check for sem |
0d79cbf8 | 3233 | * @isp: the object |
e114e473 CS |
3234 | * @cmd: what it wants to do |
3235 | * | |
3236 | * Returns 0 if current has the requested access, error code otherwise | |
3237 | */ | |
0d79cbf8 | 3238 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3239 | { |
e114e473 CS |
3240 | int may; |
3241 | ||
3242 | switch (cmd) { | |
3243 | case GETPID: | |
3244 | case GETNCNT: | |
3245 | case GETZCNT: | |
3246 | case GETVAL: | |
3247 | case GETALL: | |
3248 | case IPC_STAT: | |
3249 | case SEM_STAT: | |
a280d6dc | 3250 | case SEM_STAT_ANY: |
e114e473 CS |
3251 | may = MAY_READ; |
3252 | break; | |
3253 | case SETVAL: | |
3254 | case SETALL: | |
3255 | case IPC_RMID: | |
3256 | case IPC_SET: | |
3257 | may = MAY_READWRITE; | |
3258 | break; | |
3259 | case IPC_INFO: | |
3260 | case SEM_INFO: | |
3261 | /* | |
3262 | * System level information | |
3263 | */ | |
3264 | return 0; | |
3265 | default: | |
3266 | return -EINVAL; | |
3267 | } | |
3268 | ||
0d79cbf8 | 3269 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3270 | } |
3271 | ||
3272 | /** | |
3273 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3274 | * @isp: the object |
e114e473 CS |
3275 | * @sops: unused |
3276 | * @nsops: unused | |
3277 | * @alter: unused | |
3278 | * | |
3279 | * Treated as read and write in all cases. | |
3280 | * | |
3281 | * Returns 0 if access is allowed, error code otherwise | |
3282 | */ | |
0d79cbf8 | 3283 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3284 | unsigned nsops, int alter) |
3285 | { | |
0d79cbf8 | 3286 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3287 | } |
3288 | ||
ecfcc53f EB |
3289 | /** |
3290 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3291 | * @isp : the msq |
ecfcc53f EB |
3292 | * @access : access requested |
3293 | * | |
3294 | * return 0 if current has access, error otherwise | |
3295 | */ | |
0d79cbf8 | 3296 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3297 | { |
0d79cbf8 | 3298 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3299 | struct smk_audit_info ad; |
d166c802 | 3300 | int rc; |
ecfcc53f EB |
3301 | |
3302 | #ifdef CONFIG_AUDIT | |
3303 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3304 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3305 | #endif |
d166c802 CS |
3306 | rc = smk_curacc(msp, access, &ad); |
3307 | rc = smk_bu_current("msq", msp, access, rc); | |
3308 | return rc; | |
ecfcc53f EB |
3309 | } |
3310 | ||
e114e473 CS |
3311 | /** |
3312 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3313 | * @isp: the object |
e114e473 CS |
3314 | * @msqflg: access requested |
3315 | * | |
3316 | * Returns 0 if current has the requested access, error code otherwise | |
3317 | */ | |
0d79cbf8 | 3318 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3319 | { |
e114e473 CS |
3320 | int may; |
3321 | ||
3322 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3323 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3324 | } |
3325 | ||
3326 | /** | |
3327 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3328 | * @isp: the object |
e114e473 CS |
3329 | * @cmd: what it wants to do |
3330 | * | |
3331 | * Returns 0 if current has the requested access, error code otherwise | |
3332 | */ | |
0d79cbf8 | 3333 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3334 | { |
e114e473 CS |
3335 | int may; |
3336 | ||
3337 | switch (cmd) { | |
3338 | case IPC_STAT: | |
3339 | case MSG_STAT: | |
23c8cec8 | 3340 | case MSG_STAT_ANY: |
e114e473 CS |
3341 | may = MAY_READ; |
3342 | break; | |
3343 | case IPC_SET: | |
3344 | case IPC_RMID: | |
3345 | may = MAY_READWRITE; | |
3346 | break; | |
3347 | case IPC_INFO: | |
3348 | case MSG_INFO: | |
3349 | /* | |
3350 | * System level information | |
3351 | */ | |
3352 | return 0; | |
3353 | default: | |
3354 | return -EINVAL; | |
3355 | } | |
3356 | ||
0d79cbf8 | 3357 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3358 | } |
3359 | ||
3360 | /** | |
3361 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3362 | * @isp: the object |
e114e473 CS |
3363 | * @msg: unused |
3364 | * @msqflg: access requested | |
3365 | * | |
3366 | * Returns 0 if current has the requested access, error code otherwise | |
3367 | */ | |
0d79cbf8 | 3368 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3369 | int msqflg) |
3370 | { | |
ecfcc53f | 3371 | int may; |
e114e473 | 3372 | |
ecfcc53f | 3373 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3374 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3375 | } |
3376 | ||
3377 | /** | |
b57d0209 | 3378 | * smack_msg_queue_msgrcv - Smack access check for msg_queue |
0d79cbf8 | 3379 | * @isp: the object |
e114e473 CS |
3380 | * @msg: unused |
3381 | * @target: unused | |
3382 | * @type: unused | |
3383 | * @mode: unused | |
3384 | * | |
3385 | * Returns 0 if current has read and write access, error code otherwise | |
3386 | */ | |
b57d0209 CS |
3387 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, |
3388 | struct msg_msg *msg, | |
3389 | struct task_struct *target, long type, | |
3390 | int mode) | |
e114e473 | 3391 | { |
0d79cbf8 | 3392 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3393 | } |
3394 | ||
3395 | /** | |
3396 | * smack_ipc_permission - Smack access for ipc_permission() | |
3397 | * @ipp: the object permissions | |
3398 | * @flag: access requested | |
3399 | * | |
3400 | * Returns 0 if current has read and write access, error code otherwise | |
3401 | */ | |
3402 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3403 | { | |
019bcca4 CS |
3404 | struct smack_known **blob = smack_ipc(ipp); |
3405 | struct smack_known *iskp = *blob; | |
ecfcc53f EB |
3406 | int may = smack_flags_to_may(flag); |
3407 | struct smk_audit_info ad; | |
d166c802 | 3408 | int rc; |
e114e473 | 3409 | |
ecfcc53f EB |
3410 | #ifdef CONFIG_AUDIT |
3411 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3412 | ad.a.u.ipc_id = ipp->id; | |
3413 | #endif | |
21c7eae2 LP |
3414 | rc = smk_curacc(iskp, may, &ad); |
3415 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3416 | return rc; |
e114e473 CS |
3417 | } |
3418 | ||
d20bdda6 AD |
3419 | /** |
3420 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3421 | * @ipp: the object permissions |
d20bdda6 AD |
3422 | * @secid: where result will be saved |
3423 | */ | |
3424 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3425 | { | |
019bcca4 CS |
3426 | struct smack_known **blob = smack_ipc(ipp); |
3427 | struct smack_known *iskp = *blob; | |
d20bdda6 | 3428 | |
21c7eae2 | 3429 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3430 | } |
3431 | ||
e114e473 CS |
3432 | /** |
3433 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3434 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3435 | * @inode: the object |
3436 | * | |
3437 | * Set the inode's security blob if it hasn't been done already. | |
3438 | */ | |
3439 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3440 | { | |
3441 | struct super_block *sbp; | |
3442 | struct superblock_smack *sbsp; | |
3443 | struct inode_smack *isp; | |
2f823ff8 CS |
3444 | struct smack_known *skp; |
3445 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3446 | struct smack_known *final; |
5c6d1125 JS |
3447 | char trattr[TRANS_TRUE_SIZE]; |
3448 | int transflag = 0; | |
2267b13a | 3449 | int rc; |
e114e473 CS |
3450 | struct dentry *dp; |
3451 | ||
3452 | if (inode == NULL) | |
3453 | return; | |
3454 | ||
fb4021b6 | 3455 | isp = smack_inode(inode); |
e114e473 | 3456 | |
e114e473 CS |
3457 | /* |
3458 | * If the inode is already instantiated | |
3459 | * take the quick way out | |
3460 | */ | |
3461 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
921bb1cb | 3462 | return; |
e114e473 CS |
3463 | |
3464 | sbp = inode->i_sb; | |
1aea7808 | 3465 | sbsp = smack_superblock(sbp); |
e114e473 CS |
3466 | /* |
3467 | * We're going to use the superblock default label | |
3468 | * if there's no label on the file. | |
3469 | */ | |
3470 | final = sbsp->smk_default; | |
3471 | ||
e97dcb0e CS |
3472 | /* |
3473 | * If this is the root inode the superblock | |
3474 | * may be in the process of initialization. | |
3475 | * If that is the case use the root value out | |
3476 | * of the superblock. | |
3477 | */ | |
3478 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3479 | switch (sbp->s_magic) { |
3480 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3481 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3482 | /* |
3483 | * The cgroup filesystem is never mounted, | |
3484 | * so there's no opportunity to set the mount | |
3485 | * options. | |
3486 | */ | |
21c7eae2 LP |
3487 | sbsp->smk_root = &smack_known_star; |
3488 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3489 | isp->smk_inode = sbsp->smk_root; |
3490 | break; | |
3491 | case TMPFS_MAGIC: | |
3492 | /* | |
3493 | * What about shmem/tmpfs anonymous files with dentry | |
3494 | * obtained from d_alloc_pseudo()? | |
3495 | */ | |
3496 | isp->smk_inode = smk_of_current(); | |
3497 | break; | |
8da4aba5 RK |
3498 | case PIPEFS_MAGIC: |
3499 | isp->smk_inode = smk_of_current(); | |
3500 | break; | |
805b65a8 RK |
3501 | case SOCKFS_MAGIC: |
3502 | /* | |
3503 | * Socket access is controlled by the socket | |
3504 | * structures associated with the task involved. | |
3505 | */ | |
3506 | isp->smk_inode = &smack_known_star; | |
3507 | break; | |
1d8c2326 ŁS |
3508 | default: |
3509 | isp->smk_inode = sbsp->smk_root; | |
3510 | break; | |
36ea735b | 3511 | } |
e97dcb0e | 3512 | isp->smk_flags |= SMK_INODE_INSTANT; |
921bb1cb | 3513 | return; |
e97dcb0e CS |
3514 | } |
3515 | ||
e114e473 CS |
3516 | /* |
3517 | * This is pretty hackish. | |
3518 | * Casey says that we shouldn't have to do | |
3519 | * file system specific code, but it does help | |
3520 | * with keeping it simple. | |
3521 | */ | |
3522 | switch (sbp->s_magic) { | |
3523 | case SMACK_MAGIC: | |
36ea735b | 3524 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3525 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3526 | /* |
25985edc | 3527 | * Casey says that it's a little embarrassing |
e114e473 CS |
3528 | * that the smack file system doesn't do |
3529 | * extended attributes. | |
36ea735b | 3530 | * |
36ea735b | 3531 | * Cgroupfs is special |
e114e473 | 3532 | */ |
21c7eae2 | 3533 | final = &smack_known_star; |
e114e473 CS |
3534 | break; |
3535 | case DEVPTS_SUPER_MAGIC: | |
3536 | /* | |
3537 | * devpts seems content with the label of the task. | |
3538 | * Programs that change smack have to treat the | |
3539 | * pty with respect. | |
3540 | */ | |
21c7eae2 | 3541 | final = ckp; |
e114e473 | 3542 | break; |
e114e473 CS |
3543 | case PROC_SUPER_MAGIC: |
3544 | /* | |
3545 | * Casey says procfs appears not to care. | |
3546 | * The superblock default suffices. | |
3547 | */ | |
3548 | break; | |
3549 | case TMPFS_MAGIC: | |
3550 | /* | |
3551 | * Device labels should come from the filesystem, | |
3552 | * but watch out, because they're volitile, | |
3553 | * getting recreated on every reboot. | |
3554 | */ | |
21c7eae2 | 3555 | final = &smack_known_star; |
e114e473 | 3556 | /* |
e114e473 CS |
3557 | * If a smack value has been set we want to use it, |
3558 | * but since tmpfs isn't giving us the opportunity | |
3559 | * to set mount options simulate setting the | |
3560 | * superblock default. | |
3561 | */ | |
df561f66 | 3562 | fallthrough; |
e114e473 CS |
3563 | default: |
3564 | /* | |
3565 | * This isn't an understood special case. | |
3566 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3567 | */ |
3568 | ||
3569 | /* | |
3570 | * UNIX domain sockets use lower level socket data. | |
3571 | */ | |
3572 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3573 | final = &smack_known_star; |
b4e0d5f0 CS |
3574 | break; |
3575 | } | |
3576 | /* | |
e114e473 CS |
3577 | * No xattr support means, alas, no SMACK label. |
3578 | * Use the aforeapplied default. | |
3579 | * It would be curious if the label of the task | |
3580 | * does not match that assigned. | |
3581 | */ | |
5d6c3191 AG |
3582 | if (!(inode->i_opflags & IOP_XATTR)) |
3583 | break; | |
e114e473 CS |
3584 | /* |
3585 | * Get the dentry for xattr. | |
3586 | */ | |
3e62cbb8 | 3587 | dp = dget(opt_dentry); |
2f823ff8 | 3588 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3589 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3590 | final = skp; |
2267b13a CS |
3591 | |
3592 | /* | |
3593 | * Transmuting directory | |
3594 | */ | |
3595 | if (S_ISDIR(inode->i_mode)) { | |
3596 | /* | |
3597 | * If this is a new directory and the label was | |
3598 | * transmuted when the inode was initialized | |
3599 | * set the transmute attribute on the directory | |
3600 | * and mark the inode. | |
3601 | * | |
3602 | * If there is a transmute attribute on the | |
3603 | * directory mark the inode. | |
3604 | */ | |
baed456a RS |
3605 | rc = __vfs_getxattr(dp, inode, |
3606 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3607 | TRANS_TRUE_SIZE); | |
3608 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3609 | TRANS_TRUE_SIZE) != 0) | |
3610 | rc = -EINVAL; | |
2267b13a CS |
3611 | if (rc >= 0) |
3612 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3613 | } |
809c02e0 SF |
3614 | /* |
3615 | * Don't let the exec or mmap label be "*" or "@". | |
3616 | */ | |
3617 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3618 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3619 | skp == &smack_known_web) | |
3620 | skp = NULL; | |
3621 | isp->smk_task = skp; | |
e774ad68 | 3622 | |
19760ad0 | 3623 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3624 | if (IS_ERR(skp) || skp == &smack_known_star || |
3625 | skp == &smack_known_web) | |
19760ad0 CS |
3626 | skp = NULL; |
3627 | isp->smk_mmap = skp; | |
676dac4b | 3628 | |
e114e473 CS |
3629 | dput(dp); |
3630 | break; | |
3631 | } | |
3632 | ||
3633 | if (final == NULL) | |
21c7eae2 | 3634 | isp->smk_inode = ckp; |
e114e473 CS |
3635 | else |
3636 | isp->smk_inode = final; | |
3637 | ||
5c6d1125 | 3638 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 | 3639 | |
e114e473 CS |
3640 | return; |
3641 | } | |
3642 | ||
38b323e5 CS |
3643 | /** |
3644 | * smack_getselfattr - Smack current process attribute | |
3645 | * @attr: which attribute to fetch | |
3646 | * @ctx: buffer to receive the result | |
3647 | * @size: available size in, actual size out | |
3648 | * @flags: unused | |
3649 | * | |
3650 | * Fill the passed user space @ctx with the details of the requested | |
3651 | * attribute. | |
3652 | * | |
3653 | * Returns the number of attributes on success, an error code otherwise. | |
3654 | * There will only ever be one attribute. | |
3655 | */ | |
3656 | static int smack_getselfattr(unsigned int attr, struct lsm_ctx __user *ctx, | |
a5a858f6 | 3657 | u32 *size, u32 flags) |
38b323e5 | 3658 | { |
38b323e5 | 3659 | int rc; |
d7cf3412 | 3660 | struct smack_known *skp; |
38b323e5 CS |
3661 | |
3662 | if (attr != LSM_ATTR_CURRENT) | |
3663 | return -EOPNOTSUPP; | |
3664 | ||
d7cf3412 PM |
3665 | skp = smk_of_current(); |
3666 | rc = lsm_fill_user_ctx(ctx, size, | |
3667 | skp->smk_known, strlen(skp->smk_known) + 1, | |
3668 | LSM_ID_SMACK, 0); | |
3669 | return (!rc ? 1 : rc); | |
38b323e5 CS |
3670 | } |
3671 | ||
e114e473 CS |
3672 | /** |
3673 | * smack_getprocattr - Smack process attribute access | |
3674 | * @p: the object task | |
3675 | * @name: the name of the attribute in /proc/.../attr | |
3676 | * @value: where to put the result | |
3677 | * | |
3678 | * Places a copy of the task Smack into value | |
3679 | * | |
3680 | * Returns the length of the smack label or an error code | |
3681 | */ | |
c8e477c6 | 3682 | static int smack_getprocattr(struct task_struct *p, const char *name, char **value) |
e114e473 | 3683 | { |
a3727a8b | 3684 | struct smack_known *skp = smk_of_task_struct_obj(p); |
e114e473 CS |
3685 | char *cp; |
3686 | int slen; | |
3687 | ||
3688 | if (strcmp(name, "current") != 0) | |
3689 | return -EINVAL; | |
3690 | ||
2f823ff8 | 3691 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3692 | if (cp == NULL) |
3693 | return -ENOMEM; | |
3694 | ||
3695 | slen = strlen(cp); | |
3696 | *value = cp; | |
3697 | return slen; | |
3698 | } | |
3699 | ||
3700 | /** | |
38b323e5 CS |
3701 | * do_setattr - Smack process attribute setting |
3702 | * @attr: the ID of the attribute | |
e114e473 CS |
3703 | * @value: the value to set |
3704 | * @size: the size of the value | |
3705 | * | |
3706 | * Sets the Smack value of the task. Only setting self | |
3707 | * is permitted and only with privilege | |
3708 | * | |
3709 | * Returns the length of the smack label or an error code | |
3710 | */ | |
38b323e5 | 3711 | static int do_setattr(u64 attr, void *value, size_t size) |
e114e473 | 3712 | { |
b17103a8 | 3713 | struct task_smack *tsp = smack_cred(current_cred()); |
d84f4f99 | 3714 | struct cred *new; |
2f823ff8 | 3715 | struct smack_known *skp; |
38416e53 ZJ |
3716 | struct smack_known_list_elem *sklep; |
3717 | int rc; | |
e114e473 | 3718 | |
38416e53 | 3719 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3720 | return -EPERM; |
3721 | ||
f7112e6c | 3722 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3723 | return -EINVAL; |
3724 | ||
38b323e5 CS |
3725 | if (attr != LSM_ATTR_CURRENT) |
3726 | return -EOPNOTSUPP; | |
e114e473 | 3727 | |
2f823ff8 | 3728 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3729 | if (IS_ERR(skp)) |
3730 | return PTR_ERR(skp); | |
e114e473 | 3731 | |
6d3dc07c | 3732 | /* |
7128ea15 HS |
3733 | * No process is ever allowed the web ("@") label |
3734 | * and the star ("*") label. | |
6d3dc07c | 3735 | */ |
7128ea15 HS |
3736 | if (skp == &smack_known_web || skp == &smack_known_star) |
3737 | return -EINVAL; | |
6d3dc07c | 3738 | |
38416e53 ZJ |
3739 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3740 | rc = -EPERM; | |
3741 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3742 | if (sklep->smk_label == skp) { | |
3743 | rc = 0; | |
3744 | break; | |
3745 | } | |
3746 | if (rc) | |
3747 | return rc; | |
3748 | } | |
3749 | ||
d84f4f99 | 3750 | new = prepare_creds(); |
6d3dc07c | 3751 | if (new == NULL) |
d84f4f99 | 3752 | return -ENOMEM; |
7898e1f8 | 3753 | |
b17103a8 | 3754 | tsp = smack_cred(new); |
2f823ff8 | 3755 | tsp->smk_task = skp; |
38416e53 ZJ |
3756 | /* |
3757 | * process can change its label only once | |
3758 | */ | |
3759 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3760 | |
d84f4f99 | 3761 | commit_creds(new); |
e114e473 CS |
3762 | return size; |
3763 | } | |
3764 | ||
38b323e5 CS |
3765 | /** |
3766 | * smack_setselfattr - Set a Smack process attribute | |
3767 | * @attr: which attribute to set | |
3768 | * @ctx: buffer containing the data | |
3769 | * @size: size of @ctx | |
3770 | * @flags: unused | |
3771 | * | |
3772 | * Fill the passed user space @ctx with the details of the requested | |
3773 | * attribute. | |
3774 | * | |
3775 | * Returns 0 on success, an error code otherwise. | |
3776 | */ | |
3777 | static int smack_setselfattr(unsigned int attr, struct lsm_ctx *ctx, | |
a5a858f6 | 3778 | u32 size, u32 flags) |
38b323e5 CS |
3779 | { |
3780 | int rc; | |
3781 | ||
3782 | rc = do_setattr(attr, ctx->ctx, ctx->ctx_len); | |
3783 | if (rc > 0) | |
3784 | return 0; | |
3785 | return rc; | |
3786 | } | |
3787 | ||
3788 | /** | |
3789 | * smack_setprocattr - Smack process attribute setting | |
3790 | * @name: the name of the attribute in /proc/.../attr | |
3791 | * @value: the value to set | |
3792 | * @size: the size of the value | |
3793 | * | |
3794 | * Sets the Smack value of the task. Only setting self | |
3795 | * is permitted and only with privilege | |
3796 | * | |
3797 | * Returns the length of the smack label or an error code | |
3798 | */ | |
3799 | static int smack_setprocattr(const char *name, void *value, size_t size) | |
3800 | { | |
3801 | int attr = lsm_name_to_attr(name); | |
3802 | ||
3803 | if (attr != LSM_ATTR_UNDEF) | |
3804 | return do_setattr(attr, value, size); | |
3805 | return -EINVAL; | |
3806 | } | |
3807 | ||
e114e473 CS |
3808 | /** |
3809 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3810 | * @sock: one sock |
3811 | * @other: the other sock | |
e114e473 CS |
3812 | * @newsk: unused |
3813 | * | |
3814 | * Return 0 if a subject with the smack of sock could access | |
3815 | * an object with the smack of other, otherwise an error code | |
3816 | */ | |
3610cda5 DM |
3817 | static int smack_unix_stream_connect(struct sock *sock, |
3818 | struct sock *other, struct sock *newsk) | |
e114e473 | 3819 | { |
2f823ff8 | 3820 | struct smack_known *skp; |
54e70ec5 | 3821 | struct smack_known *okp; |
d2e7ad19 JM |
3822 | struct socket_smack *ssp = sock->sk_security; |
3823 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3824 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3825 | struct smk_audit_info ad; |
b4e0d5f0 | 3826 | int rc = 0; |
923e9a13 KC |
3827 | #ifdef CONFIG_AUDIT |
3828 | struct lsm_network_audit net; | |
923e9a13 | 3829 | #endif |
b4e0d5f0 | 3830 | |
2f823ff8 CS |
3831 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3832 | skp = ssp->smk_out; | |
96be7b54 | 3833 | okp = osp->smk_in; |
54e70ec5 CS |
3834 | #ifdef CONFIG_AUDIT |
3835 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3836 | smk_ad_setfield_u_net_sk(&ad, other); | |
3837 | #endif | |
21c7eae2 LP |
3838 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3839 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3840 | if (rc == 0) { |
96be7b54 ZJ |
3841 | okp = osp->smk_out; |
3842 | skp = ssp->smk_in; | |
138a868f | 3843 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3844 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3845 | MAY_WRITE, rc); |
3846 | } | |
2f823ff8 | 3847 | } |
b4e0d5f0 | 3848 | |
975d5e55 CS |
3849 | /* |
3850 | * Cross reference the peer labels for SO_PEERSEC. | |
3851 | */ | |
3852 | if (rc == 0) { | |
54e70ec5 CS |
3853 | nsp->smk_packet = ssp->smk_out; |
3854 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3855 | } |
3856 | ||
b4e0d5f0 | 3857 | return rc; |
e114e473 CS |
3858 | } |
3859 | ||
3860 | /** | |
3861 | * smack_unix_may_send - Smack access on UDS | |
3862 | * @sock: one socket | |
3863 | * @other: the other socket | |
3864 | * | |
3865 | * Return 0 if a subject with the smack of sock could access | |
3866 | * an object with the smack of other, otherwise an error code | |
3867 | */ | |
3868 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3869 | { | |
b4e0d5f0 CS |
3870 | struct socket_smack *ssp = sock->sk->sk_security; |
3871 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3872 | struct smk_audit_info ad; |
d166c802 | 3873 | int rc; |
e114e473 | 3874 | |
923e9a13 KC |
3875 | #ifdef CONFIG_AUDIT |
3876 | struct lsm_network_audit net; | |
3877 | ||
48c62af6 | 3878 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3879 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3880 | #endif |
b4e0d5f0 | 3881 | |
2f823ff8 CS |
3882 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3883 | return 0; | |
b4e0d5f0 | 3884 | |
21c7eae2 LP |
3885 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3886 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3887 | return rc; |
e114e473 CS |
3888 | } |
3889 | ||
6d3dc07c CS |
3890 | /** |
3891 | * smack_socket_sendmsg - Smack check based on destination host | |
3892 | * @sock: the socket | |
251a2a95 | 3893 | * @msg: the message |
6d3dc07c CS |
3894 | * @size: the size of the message |
3895 | * | |
c6739443 CS |
3896 | * Return 0 if the current subject can write to the destination host. |
3897 | * For IPv4 this is only a question if the destination is a single label host. | |
3898 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3899 | */ |
3900 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3901 | int size) | |
3902 | { | |
3903 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3904 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3905 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3906 | #endif |
3907 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3908 | struct socket_smack *ssp = sock->sk->sk_security; | |
3909 | struct smack_known *rsp; | |
3910 | #endif | |
c6739443 | 3911 | int rc = 0; |
6d3dc07c CS |
3912 | |
3913 | /* | |
3914 | * Perfectly reasonable for this to be NULL | |
3915 | */ | |
c6739443 | 3916 | if (sip == NULL) |
6d3dc07c CS |
3917 | return 0; |
3918 | ||
81bd0d56 | 3919 | switch (sock->sk->sk_family) { |
c6739443 | 3920 | case AF_INET: |
b9ef5513 TH |
3921 | if (msg->msg_namelen < sizeof(struct sockaddr_in) || |
3922 | sip->sin_family != AF_INET) | |
3923 | return -EINVAL; | |
a2af0318 | 3924 | rc = smk_ipv4_check(sock->sk, sip); |
c6739443 | 3925 | break; |
619ae03e | 3926 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3927 | case AF_INET6: |
b9ef5513 TH |
3928 | if (msg->msg_namelen < SIN6_LEN_RFC2133 || |
3929 | sap->sin6_family != AF_INET6) | |
3930 | return -EINVAL; | |
21abb1ec CS |
3931 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3932 | rsp = smack_ipv6host_label(sap); | |
3933 | if (rsp != NULL) | |
3934 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3935 | SMK_CONNECTING); | |
3936 | #endif | |
3937 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3938 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3939 | #endif |
619ae03e | 3940 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
c6739443 CS |
3941 | break; |
3942 | } | |
3943 | return rc; | |
6d3dc07c CS |
3944 | } |
3945 | ||
e114e473 | 3946 | /** |
251a2a95 | 3947 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3948 | * @sap: netlabel secattr |
272cd7a8 | 3949 | * @ssp: socket security information |
e114e473 | 3950 | * |
2f823ff8 | 3951 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3952 | */ |
2f823ff8 CS |
3953 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3954 | struct socket_smack *ssp) | |
e114e473 | 3955 | { |
2f823ff8 | 3956 | struct smack_known *skp; |
f7112e6c | 3957 | int found = 0; |
677264e8 CS |
3958 | int acat; |
3959 | int kcat; | |
e114e473 | 3960 | |
322dd63c CS |
3961 | /* |
3962 | * Netlabel found it in the cache. | |
3963 | */ | |
3964 | if ((sap->flags & NETLBL_SECATTR_CACHE) != 0) | |
3965 | return (struct smack_known *)sap->cache->data; | |
3966 | ||
3967 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) | |
3968 | /* | |
3969 | * Looks like a fallback, which gives us a secid. | |
3970 | */ | |
3971 | return smack_from_secid(sap->attr.secid); | |
3972 | ||
6d3dc07c | 3973 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3974 | /* |
6d3dc07c | 3975 | * Looks like a CIPSO packet. |
e114e473 CS |
3976 | * If there are flags but no level netlabel isn't |
3977 | * behaving the way we expect it to. | |
3978 | * | |
f7112e6c | 3979 | * Look it up in the label table |
e114e473 CS |
3980 | * Without guidance regarding the smack value |
3981 | * for the packet fall back on the network | |
3982 | * ambient value. | |
3983 | */ | |
f7112e6c | 3984 | rcu_read_lock(); |
348dc288 | 3985 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3986 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3987 | continue; |
677264e8 CS |
3988 | /* |
3989 | * Compare the catsets. Use the netlbl APIs. | |
3990 | */ | |
3991 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3992 | if ((skp->smk_netlabel.flags & | |
3993 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3994 | found = 1; | |
3995 | break; | |
3996 | } | |
3997 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3998 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3999 | acat + 1); | |
4000 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
4001 | skp->smk_netlabel.attr.mls.cat, |
4002 | kcat + 1); | |
4003 | if (acat < 0 || kcat < 0) | |
4004 | break; | |
4005 | } | |
4006 | if (acat == kcat) { | |
4007 | found = 1; | |
4008 | break; | |
4009 | } | |
6d3dc07c | 4010 | } |
f7112e6c CS |
4011 | rcu_read_unlock(); |
4012 | ||
4013 | if (found) | |
2f823ff8 | 4014 | return skp; |
f7112e6c | 4015 | |
54e70ec5 | 4016 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
4017 | return &smack_known_web; |
4018 | return &smack_known_star; | |
e114e473 | 4019 | } |
e114e473 | 4020 | /* |
6d3dc07c CS |
4021 | * Without guidance regarding the smack value |
4022 | * for the packet fall back on the network | |
4023 | * ambient value. | |
e114e473 | 4024 | */ |
272cd7a8 | 4025 | return smack_net_ambient; |
e114e473 CS |
4026 | } |
4027 | ||
69f287ae | 4028 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 4029 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 4030 | { |
c6739443 CS |
4031 | u8 nexthdr; |
4032 | int offset; | |
4033 | int proto = -EINVAL; | |
4034 | struct ipv6hdr _ipv6h; | |
4035 | struct ipv6hdr *ip6; | |
4036 | __be16 frag_off; | |
4037 | struct tcphdr _tcph, *th; | |
4038 | struct udphdr _udph, *uh; | |
4039 | struct dccp_hdr _dccph, *dh; | |
4040 | ||
4041 | sip->sin6_port = 0; | |
4042 | ||
4043 | offset = skb_network_offset(skb); | |
4044 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
4045 | if (ip6 == NULL) | |
4046 | return -EINVAL; | |
4047 | sip->sin6_addr = ip6->saddr; | |
4048 | ||
4049 | nexthdr = ip6->nexthdr; | |
4050 | offset += sizeof(_ipv6h); | |
4051 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
4052 | if (offset < 0) | |
4053 | return -EINVAL; | |
4054 | ||
4055 | proto = nexthdr; | |
4056 | switch (proto) { | |
4057 | case IPPROTO_TCP: | |
4058 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
4059 | if (th != NULL) | |
4060 | sip->sin6_port = th->source; | |
4061 | break; | |
4062 | case IPPROTO_UDP: | |
a07ef951 | 4063 | case IPPROTO_UDPLITE: |
c6739443 CS |
4064 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
4065 | if (uh != NULL) | |
4066 | sip->sin6_port = uh->source; | |
4067 | break; | |
4068 | case IPPROTO_DCCP: | |
4069 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
4070 | if (dh != NULL) | |
4071 | sip->sin6_port = dh->dccph_sport; | |
4072 | break; | |
4073 | } | |
4074 | return proto; | |
4075 | } | |
69f287ae | 4076 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4077 | |
36be8129 CS |
4078 | /** |
4079 | * smack_from_skb - Smack data from the secmark in an skb | |
4080 | * @skb: packet | |
4081 | * | |
4082 | * Returns smack_known of the secmark or NULL if that won't work. | |
4083 | */ | |
bf0afe67 | 4084 | #ifdef CONFIG_NETWORK_SECMARK |
36be8129 CS |
4085 | static struct smack_known *smack_from_skb(struct sk_buff *skb) |
4086 | { | |
4087 | if (skb == NULL || skb->secmark == 0) | |
4088 | return NULL; | |
4089 | ||
4090 | return smack_from_secid(skb->secmark); | |
4091 | } | |
bf0afe67 CS |
4092 | #else |
4093 | static inline struct smack_known *smack_from_skb(struct sk_buff *skb) | |
4094 | { | |
4095 | return NULL; | |
4096 | } | |
4097 | #endif | |
36be8129 | 4098 | |
a2af0318 CS |
4099 | /** |
4100 | * smack_from_netlbl - Smack data from the IP options in an skb | |
4101 | * @sk: socket data came in on | |
4102 | * @family: address family | |
4103 | * @skb: packet | |
4104 | * | |
322dd63c CS |
4105 | * Find the Smack label in the IP options. If it hasn't been |
4106 | * added to the netlabel cache, add it here. | |
4107 | * | |
a2af0318 CS |
4108 | * Returns smack_known of the IP options or NULL if that won't work. |
4109 | */ | |
41dd9596 | 4110 | static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family, |
a2af0318 CS |
4111 | struct sk_buff *skb) |
4112 | { | |
4113 | struct netlbl_lsm_secattr secattr; | |
4114 | struct socket_smack *ssp = NULL; | |
4115 | struct smack_known *skp = NULL; | |
4116 | ||
4117 | netlbl_secattr_init(&secattr); | |
4118 | ||
4119 | if (sk) | |
4120 | ssp = sk->sk_security; | |
322dd63c CS |
4121 | |
4122 | if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) { | |
a2af0318 | 4123 | skp = smack_from_secattr(&secattr, ssp); |
322dd63c | 4124 | if (secattr.flags & NETLBL_SECATTR_CACHEABLE) |
9b0072e2 | 4125 | netlbl_cache_add(skb, family, &skp->smk_netlabel); |
322dd63c | 4126 | } |
a2af0318 CS |
4127 | |
4128 | netlbl_secattr_destroy(&secattr); | |
4129 | ||
4130 | return skp; | |
4131 | } | |
4132 | ||
e114e473 CS |
4133 | /** |
4134 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
4135 | * @sk: socket | |
4136 | * @skb: packet | |
4137 | * | |
4138 | * Returns 0 if the packet should be delivered, an error code otherwise | |
4139 | */ | |
4140 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
4141 | { | |
e114e473 | 4142 | struct socket_smack *ssp = sk->sk_security; |
69f287ae | 4143 | struct smack_known *skp = NULL; |
c6739443 | 4144 | int rc = 0; |
ecfcc53f | 4145 | struct smk_audit_info ad; |
129a9989 | 4146 | u16 family = sk->sk_family; |
923e9a13 | 4147 | #ifdef CONFIG_AUDIT |
48c62af6 | 4148 | struct lsm_network_audit net; |
923e9a13 | 4149 | #endif |
69f287ae CS |
4150 | #if IS_ENABLED(CONFIG_IPV6) |
4151 | struct sockaddr_in6 sadd; | |
4152 | int proto; | |
129a9989 PS |
4153 | |
4154 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
4155 | family = PF_INET; | |
69f287ae CS |
4156 | #endif /* CONFIG_IPV6 */ |
4157 | ||
129a9989 | 4158 | switch (family) { |
c6739443 | 4159 | case PF_INET: |
69f287ae CS |
4160 | /* |
4161 | * If there is a secmark use it rather than the CIPSO label. | |
4162 | * If there is no secmark fall back to CIPSO. | |
4163 | * The secmark is assumed to reflect policy better. | |
4164 | */ | |
36be8129 | 4165 | skp = smack_from_skb(skb); |
a2af0318 CS |
4166 | if (skp == NULL) { |
4167 | skp = smack_from_netlbl(sk, family, skb); | |
4168 | if (skp == NULL) | |
4169 | skp = smack_net_ambient; | |
69f287ae | 4170 | } |
6d3dc07c | 4171 | |
ecfcc53f | 4172 | #ifdef CONFIG_AUDIT |
c6739443 | 4173 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 4174 | ad.a.u.net->family = family; |
c6739443 CS |
4175 | ad.a.u.net->netif = skb->skb_iif; |
4176 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 4177 | #endif |
c6739443 CS |
4178 | /* |
4179 | * Receiving a packet requires that the other end | |
4180 | * be able to write here. Read access is not required. | |
4181 | * This is the simplist possible security model | |
4182 | * for networking. | |
4183 | */ | |
21c7eae2 LP |
4184 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4185 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 4186 | MAY_WRITE, rc); |
c6739443 | 4187 | if (rc != 0) |
129a9989 | 4188 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 4189 | break; |
69f287ae | 4190 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 4191 | case PF_INET6: |
69f287ae | 4192 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
4193 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
4194 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 4195 | break; |
21abb1ec | 4196 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
4197 | skp = smack_from_skb(skb); |
4198 | if (skp == NULL) { | |
4199 | if (smk_ipv6_localhost(&sadd)) | |
4200 | break; | |
21abb1ec | 4201 | skp = smack_ipv6host_label(&sadd); |
36be8129 CS |
4202 | if (skp == NULL) |
4203 | skp = smack_net_ambient; | |
4204 | } | |
69f287ae CS |
4205 | #ifdef CONFIG_AUDIT |
4206 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 4207 | ad.a.u.net->family = family; |
69f287ae CS |
4208 | ad.a.u.net->netif = skb->skb_iif; |
4209 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4210 | #endif /* CONFIG_AUDIT */ | |
4211 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4212 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4213 | MAY_WRITE, rc); | |
21abb1ec CS |
4214 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4215 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4216 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4217 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
4218 | if (rc != 0) |
4219 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
4220 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 4221 | break; |
69f287ae | 4222 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4223 | } |
69f287ae | 4224 | |
a8134296 | 4225 | return rc; |
e114e473 CS |
4226 | } |
4227 | ||
4228 | /** | |
4229 | * smack_socket_getpeersec_stream - pull in packet label | |
4230 | * @sock: the socket | |
4231 | * @optval: user's destination | |
4232 | * @optlen: size thereof | |
251a2a95 | 4233 | * @len: max thereof |
e114e473 CS |
4234 | * |
4235 | * returns zero on success, an error code otherwise | |
4236 | */ | |
4237 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
b10b9c34 PM |
4238 | sockptr_t optval, sockptr_t optlen, |
4239 | unsigned int len) | |
e114e473 CS |
4240 | { |
4241 | struct socket_smack *ssp; | |
272cd7a8 | 4242 | char *rcp = ""; |
b10b9c34 | 4243 | u32 slen = 1; |
e114e473 CS |
4244 | int rc = 0; |
4245 | ||
4246 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4247 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4248 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4249 | slen = strlen(rcp) + 1; |
4250 | } | |
b10b9c34 | 4251 | if (slen > len) { |
e114e473 | 4252 | rc = -ERANGE; |
b10b9c34 PM |
4253 | goto out_len; |
4254 | } | |
e114e473 | 4255 | |
b10b9c34 PM |
4256 | if (copy_to_sockptr(optval, rcp, slen)) |
4257 | rc = -EFAULT; | |
4258 | out_len: | |
4259 | if (copy_to_sockptr(optlen, &slen, sizeof(slen))) | |
e114e473 | 4260 | rc = -EFAULT; |
e114e473 CS |
4261 | return rc; |
4262 | } | |
4263 | ||
4264 | ||
4265 | /** | |
4266 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4267 | * @sock: the peer socket |
e114e473 CS |
4268 | * @skb: packet data |
4269 | * @secid: pointer to where to put the secid of the packet | |
4270 | * | |
4271 | * Sets the netlabel socket state on sk from parent | |
4272 | */ | |
4273 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4274 | struct sk_buff *skb, u32 *secid) | |
4275 | ||
4276 | { | |
272cd7a8 | 4277 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4278 | struct smack_known *skp; |
a2af0318 | 4279 | struct sock *sk = NULL; |
b4e0d5f0 CS |
4280 | int family = PF_UNSPEC; |
4281 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 | 4282 | |
b4e0d5f0 CS |
4283 | if (skb != NULL) { |
4284 | if (skb->protocol == htons(ETH_P_IP)) | |
4285 | family = PF_INET; | |
69f287ae | 4286 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4287 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4288 | family = PF_INET6; | |
69f287ae | 4289 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4290 | } |
b4e0d5f0 CS |
4291 | if (family == PF_UNSPEC && sock != NULL) |
4292 | family = sock->sk->sk_family; | |
e114e473 | 4293 | |
69f287ae CS |
4294 | switch (family) { |
4295 | case PF_UNIX: | |
272cd7a8 | 4296 | ssp = sock->sk->sk_security; |
2f823ff8 | 4297 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4298 | break; |
4299 | case PF_INET: | |
36be8129 CS |
4300 | skp = smack_from_skb(skb); |
4301 | if (skp) { | |
4302 | s = skp->smk_secid; | |
69f287ae | 4303 | break; |
36be8129 | 4304 | } |
b4e0d5f0 CS |
4305 | /* |
4306 | * Translate what netlabel gave us. | |
4307 | */ | |
a2af0318 CS |
4308 | if (sock != NULL) |
4309 | sk = sock->sk; | |
4310 | skp = smack_from_netlbl(sk, family, skb); | |
4311 | if (skp != NULL) | |
2f823ff8 | 4312 | s = skp->smk_secid; |
69f287ae | 4313 | break; |
69f287ae | 4314 | case PF_INET6: |
21abb1ec | 4315 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
4316 | skp = smack_from_skb(skb); |
4317 | if (skp) | |
4318 | s = skp->smk_secid; | |
21abb1ec | 4319 | #endif |
69f287ae | 4320 | break; |
b4e0d5f0 CS |
4321 | } |
4322 | *secid = s; | |
e114e473 CS |
4323 | if (s == 0) |
4324 | return -EINVAL; | |
e114e473 CS |
4325 | return 0; |
4326 | } | |
4327 | ||
4328 | /** | |
07feee8f PM |
4329 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4330 | * @sk: child sock | |
4331 | * @parent: parent socket | |
e114e473 | 4332 | * |
07feee8f PM |
4333 | * Set the smk_{in,out} state of an existing sock based on the process that |
4334 | * is creating the new socket. | |
e114e473 CS |
4335 | */ |
4336 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4337 | { | |
4338 | struct socket_smack *ssp; | |
2f823ff8 | 4339 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4340 | |
07feee8f PM |
4341 | if (sk == NULL || |
4342 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4343 | return; |
4344 | ||
4345 | ssp = sk->sk_security; | |
54e70ec5 | 4346 | ssp->smk_in = skp; |
2f823ff8 | 4347 | ssp->smk_out = skp; |
07feee8f | 4348 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4349 | } |
4350 | ||
4351 | /** | |
4352 | * smack_inet_conn_request - Smack access check on connect | |
4353 | * @sk: socket involved | |
4354 | * @skb: packet | |
4355 | * @req: unused | |
4356 | * | |
4357 | * Returns 0 if a task with the packet label could write to | |
4358 | * the socket, otherwise an error code | |
4359 | */ | |
41dd9596 | 4360 | static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb, |
e114e473 CS |
4361 | struct request_sock *req) |
4362 | { | |
07feee8f | 4363 | u16 family = sk->sk_family; |
f7112e6c | 4364 | struct smack_known *skp; |
e114e473 | 4365 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4366 | struct sockaddr_in addr; |
4367 | struct iphdr *hdr; | |
21c7eae2 | 4368 | struct smack_known *hskp; |
e114e473 | 4369 | int rc; |
ecfcc53f | 4370 | struct smk_audit_info ad; |
923e9a13 | 4371 | #ifdef CONFIG_AUDIT |
48c62af6 | 4372 | struct lsm_network_audit net; |
923e9a13 | 4373 | #endif |
e114e473 | 4374 | |
69f287ae | 4375 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4376 | if (family == PF_INET6) { |
4377 | /* | |
4378 | * Handle mapped IPv4 packets arriving | |
4379 | * via IPv6 sockets. Don't set up netlabel | |
4380 | * processing on IPv6. | |
4381 | */ | |
4382 | if (skb->protocol == htons(ETH_P_IP)) | |
4383 | family = PF_INET; | |
4384 | else | |
4385 | return 0; | |
4386 | } | |
69f287ae | 4387 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4388 | |
7f368ad3 CS |
4389 | /* |
4390 | * If there is a secmark use it rather than the CIPSO label. | |
4391 | * If there is no secmark fall back to CIPSO. | |
4392 | * The secmark is assumed to reflect policy better. | |
4393 | */ | |
36be8129 | 4394 | skp = smack_from_skb(skb); |
a2af0318 CS |
4395 | if (skp == NULL) { |
4396 | skp = smack_from_netlbl(sk, family, skb); | |
4397 | if (skp == NULL) | |
4398 | skp = &smack_known_huh; | |
7f368ad3 | 4399 | } |
7f368ad3 | 4400 | |
ecfcc53f | 4401 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4402 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4403 | ad.a.u.net->family = family; | |
4404 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4405 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4406 | #endif | |
e114e473 | 4407 | /* |
07feee8f PM |
4408 | * Receiving a packet requires that the other end be able to write |
4409 | * here. Read access is not required. | |
e114e473 | 4410 | */ |
21c7eae2 LP |
4411 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4412 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4413 | if (rc != 0) |
4414 | return rc; | |
4415 | ||
4416 | /* | |
4417 | * Save the peer's label in the request_sock so we can later setup | |
4418 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4419 | */ | |
2f823ff8 | 4420 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4421 | |
4422 | /* | |
4423 | * We need to decide if we want to label the incoming connection here | |
4424 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4425 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4426 | */ |
4427 | hdr = ip_hdr(skb); | |
4428 | addr.sin_addr.s_addr = hdr->saddr; | |
4429 | rcu_read_lock(); | |
21abb1ec | 4430 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4431 | rcu_read_unlock(); |
4432 | ||
21c7eae2 | 4433 | if (hskp == NULL) |
f7112e6c | 4434 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4435 | else |
07feee8f | 4436 | netlbl_req_delattr(req); |
e114e473 CS |
4437 | |
4438 | return rc; | |
4439 | } | |
4440 | ||
07feee8f PM |
4441 | /** |
4442 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4443 | * @sk: the new socket | |
4444 | * @req: the connection's request_sock | |
4445 | * | |
4446 | * Transfer the connection's peer label to the newly created socket. | |
4447 | */ | |
4448 | static void smack_inet_csk_clone(struct sock *sk, | |
4449 | const struct request_sock *req) | |
4450 | { | |
4451 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4452 | struct smack_known *skp; |
07feee8f | 4453 | |
2f823ff8 CS |
4454 | if (req->peer_secid != 0) { |
4455 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4456 | ssp->smk_packet = skp; |
2f823ff8 | 4457 | } else |
272cd7a8 | 4458 | ssp->smk_packet = NULL; |
07feee8f PM |
4459 | } |
4460 | ||
e114e473 CS |
4461 | /* |
4462 | * Key management security hooks | |
4463 | * | |
4464 | * Casey has not tested key support very heavily. | |
4465 | * The permission check is most likely too restrictive. | |
4466 | * If you care about keys please have a look. | |
4467 | */ | |
4468 | #ifdef CONFIG_KEYS | |
4469 | ||
4470 | /** | |
4471 | * smack_key_alloc - Set the key security blob | |
4472 | * @key: object | |
d84f4f99 | 4473 | * @cred: the credentials to use |
e114e473 CS |
4474 | * @flags: unused |
4475 | * | |
4476 | * No allocation required | |
4477 | * | |
4478 | * Returns 0 | |
4479 | */ | |
d84f4f99 | 4480 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4481 | unsigned long flags) |
4482 | { | |
b17103a8 | 4483 | struct smack_known *skp = smk_of_task(smack_cred(cred)); |
2f823ff8 | 4484 | |
21c7eae2 | 4485 | key->security = skp; |
e114e473 CS |
4486 | return 0; |
4487 | } | |
4488 | ||
4489 | /** | |
4490 | * smack_key_free - Clear the key security blob | |
4491 | * @key: the object | |
4492 | * | |
4493 | * Clear the blob pointer | |
4494 | */ | |
4495 | static void smack_key_free(struct key *key) | |
4496 | { | |
4497 | key->security = NULL; | |
4498 | } | |
4499 | ||
1a28979b | 4500 | /** |
e114e473 CS |
4501 | * smack_key_permission - Smack access on a key |
4502 | * @key_ref: gets to the object | |
d84f4f99 | 4503 | * @cred: the credentials to use |
8c0637e9 | 4504 | * @need_perm: requested key permission |
e114e473 CS |
4505 | * |
4506 | * Return 0 if the task has read and write to the object, | |
4507 | * an error code otherwise | |
4508 | */ | |
4509 | static int smack_key_permission(key_ref_t key_ref, | |
8c0637e9 DH |
4510 | const struct cred *cred, |
4511 | enum key_need_perm need_perm) | |
e114e473 CS |
4512 | { |
4513 | struct key *keyp; | |
ecfcc53f | 4514 | struct smk_audit_info ad; |
b17103a8 | 4515 | struct smack_known *tkp = smk_of_task(smack_cred(cred)); |
fffea214 | 4516 | int request = 0; |
d166c802 | 4517 | int rc; |
e114e473 | 4518 | |
5b841bfa ZM |
4519 | /* |
4520 | * Validate requested permissions | |
4521 | */ | |
8c0637e9 DH |
4522 | switch (need_perm) { |
4523 | case KEY_NEED_READ: | |
4524 | case KEY_NEED_SEARCH: | |
4525 | case KEY_NEED_VIEW: | |
4526 | request |= MAY_READ; | |
4527 | break; | |
4528 | case KEY_NEED_WRITE: | |
4529 | case KEY_NEED_LINK: | |
4530 | case KEY_NEED_SETATTR: | |
4531 | request |= MAY_WRITE; | |
4532 | break; | |
4533 | case KEY_NEED_UNSPECIFIED: | |
4534 | case KEY_NEED_UNLINK: | |
4535 | case KEY_SYSADMIN_OVERRIDE: | |
4536 | case KEY_AUTHTOKEN_OVERRIDE: | |
4537 | case KEY_DEFER_PERM_CHECK: | |
4538 | return 0; | |
4539 | default: | |
5b841bfa | 4540 | return -EINVAL; |
8c0637e9 | 4541 | } |
5b841bfa | 4542 | |
e114e473 CS |
4543 | keyp = key_ref_to_ptr(key_ref); |
4544 | if (keyp == NULL) | |
4545 | return -EINVAL; | |
4546 | /* | |
4547 | * If the key hasn't been initialized give it access so that | |
4548 | * it may do so. | |
4549 | */ | |
4550 | if (keyp->security == NULL) | |
4551 | return 0; | |
4552 | /* | |
4553 | * This should not occur | |
4554 | */ | |
2f823ff8 | 4555 | if (tkp == NULL) |
e114e473 | 4556 | return -EACCES; |
d19dfe58 | 4557 | |
a8478a60 | 4558 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
d19dfe58 CS |
4559 | return 0; |
4560 | ||
ecfcc53f EB |
4561 | #ifdef CONFIG_AUDIT |
4562 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4563 | ad.a.u.key_struct.key = keyp->serial; | |
4564 | ad.a.u.key_struct.key_desc = keyp->description; | |
4565 | #endif | |
d166c802 CS |
4566 | rc = smk_access(tkp, keyp->security, request, &ad); |
4567 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4568 | return rc; | |
e114e473 | 4569 | } |
7fc5f36e JB |
4570 | |
4571 | /* | |
4572 | * smack_key_getsecurity - Smack label tagging the key | |
4573 | * @key points to the key to be queried | |
4574 | * @_buffer points to a pointer that should be set to point to the | |
4575 | * resulting string (if no label or an error occurs). | |
4576 | * Return the length of the string (including terminating NUL) or -ve if | |
4577 | * an error. | |
4578 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4579 | */ | |
4580 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4581 | { | |
4582 | struct smack_known *skp = key->security; | |
4583 | size_t length; | |
4584 | char *copy; | |
4585 | ||
4586 | if (key->security == NULL) { | |
4587 | *_buffer = NULL; | |
4588 | return 0; | |
4589 | } | |
4590 | ||
4591 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4592 | if (copy == NULL) | |
4593 | return -ENOMEM; | |
4594 | length = strlen(copy) + 1; | |
4595 | ||
4596 | *_buffer = copy; | |
4597 | return length; | |
4598 | } | |
4599 | ||
a8478a60 DH |
4600 | |
4601 | #ifdef CONFIG_KEY_NOTIFICATIONS | |
4602 | /** | |
4603 | * smack_watch_key - Smack access to watch a key for notifications. | |
4604 | * @key: The key to be watched | |
4605 | * | |
4606 | * Return 0 if the @watch->cred has permission to read from the key object and | |
4607 | * an error otherwise. | |
4608 | */ | |
4609 | static int smack_watch_key(struct key *key) | |
4610 | { | |
4611 | struct smk_audit_info ad; | |
4612 | struct smack_known *tkp = smk_of_current(); | |
4613 | int rc; | |
4614 | ||
4615 | if (key == NULL) | |
4616 | return -EINVAL; | |
4617 | /* | |
4618 | * If the key hasn't been initialized give it access so that | |
4619 | * it may do so. | |
4620 | */ | |
4621 | if (key->security == NULL) | |
4622 | return 0; | |
4623 | /* | |
4624 | * This should not occur | |
4625 | */ | |
4626 | if (tkp == NULL) | |
4627 | return -EACCES; | |
4628 | ||
4629 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) | |
4630 | return 0; | |
4631 | ||
4632 | #ifdef CONFIG_AUDIT | |
4633 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4634 | ad.a.u.key_struct.key = key->serial; | |
4635 | ad.a.u.key_struct.key_desc = key->description; | |
4636 | #endif | |
4637 | rc = smk_access(tkp, key->security, MAY_READ, &ad); | |
4638 | rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc); | |
4639 | return rc; | |
4640 | } | |
4641 | #endif /* CONFIG_KEY_NOTIFICATIONS */ | |
e114e473 CS |
4642 | #endif /* CONFIG_KEYS */ |
4643 | ||
a8478a60 DH |
4644 | #ifdef CONFIG_WATCH_QUEUE |
4645 | /** | |
4646 | * smack_post_notification - Smack access to post a notification to a queue | |
4647 | * @w_cred: The credentials of the watcher. | |
4648 | * @cred: The credentials of the event source (may be NULL). | |
4649 | * @n: The notification message to be posted. | |
4650 | */ | |
4651 | static int smack_post_notification(const struct cred *w_cred, | |
4652 | const struct cred *cred, | |
4653 | struct watch_notification *n) | |
4654 | { | |
4655 | struct smk_audit_info ad; | |
4656 | struct smack_known *subj, *obj; | |
4657 | int rc; | |
4658 | ||
4659 | /* Always let maintenance notifications through. */ | |
4660 | if (n->type == WATCH_TYPE_META) | |
4661 | return 0; | |
4662 | ||
4663 | if (!cred) | |
4664 | return 0; | |
4665 | subj = smk_of_task(smack_cred(cred)); | |
4666 | obj = smk_of_task(smack_cred(w_cred)); | |
4667 | ||
4668 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION); | |
4669 | rc = smk_access(subj, obj, MAY_WRITE, &ad); | |
4670 | rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc); | |
4671 | return rc; | |
4672 | } | |
4673 | #endif /* CONFIG_WATCH_QUEUE */ | |
4674 | ||
d20bdda6 AD |
4675 | /* |
4676 | * Smack Audit hooks | |
4677 | * | |
4678 | * Audit requires a unique representation of each Smack specific | |
4679 | * rule. This unique representation is used to distinguish the | |
4680 | * object to be audited from remaining kernel objects and also | |
4681 | * works as a glue between the audit hooks. | |
4682 | * | |
4683 | * Since repository entries are added but never deleted, we'll use | |
4684 | * the smack_known label address related to the given audit rule as | |
4685 | * the needed unique representation. This also better fits the smack | |
4686 | * model where nearly everything is a label. | |
4687 | */ | |
4688 | #ifdef CONFIG_AUDIT | |
4689 | ||
4690 | /** | |
4691 | * smack_audit_rule_init - Initialize a smack audit rule | |
4692 | * @field: audit rule fields given from user-space (audit.h) | |
4693 | * @op: required testing operator (=, !=, >, <, ...) | |
4694 | * @rulestr: smack label to be audited | |
4695 | * @vrule: pointer to save our own audit rule representation | |
4696 | * | |
4697 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4698 | * The label to be audited is created if necessay. | |
4699 | */ | |
4700 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4701 | { | |
21c7eae2 | 4702 | struct smack_known *skp; |
d20bdda6 AD |
4703 | char **rule = (char **)vrule; |
4704 | *rule = NULL; | |
4705 | ||
4706 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4707 | return -EINVAL; | |
4708 | ||
5af75d8d | 4709 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4710 | return -EINVAL; |
4711 | ||
21c7eae2 | 4712 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4713 | if (IS_ERR(skp)) |
4714 | return PTR_ERR(skp); | |
4715 | ||
4716 | *rule = skp->smk_known; | |
d20bdda6 AD |
4717 | |
4718 | return 0; | |
4719 | } | |
4720 | ||
4721 | /** | |
4722 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4723 | * @krule: rule of interest, in Audit kernel representation format | |
4724 | * | |
4725 | * This is used to filter Smack rules from remaining Audit ones. | |
4726 | * If it's proved that this rule belongs to us, the | |
4727 | * audit_rule_match hook will be called to do the final judgement. | |
4728 | */ | |
4729 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4730 | { | |
4731 | struct audit_field *f; | |
4732 | int i; | |
4733 | ||
4734 | for (i = 0; i < krule->field_count; i++) { | |
4735 | f = &krule->fields[i]; | |
4736 | ||
4737 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4738 | return 1; | |
4739 | } | |
4740 | ||
4741 | return 0; | |
4742 | } | |
4743 | ||
4744 | /** | |
4745 | * smack_audit_rule_match - Audit given object ? | |
4746 | * @secid: security id for identifying the object to test | |
4747 | * @field: audit rule flags given from user-space | |
4748 | * @op: required testing operator | |
4749 | * @vrule: smack internal rule presentation | |
d20bdda6 AD |
4750 | * |
4751 | * The core Audit hook. It's used to take the decision of | |
4752 | * whether to audit or not to audit a given object. | |
4753 | */ | |
90462a5b | 4754 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule) |
d20bdda6 | 4755 | { |
2f823ff8 | 4756 | struct smack_known *skp; |
d20bdda6 AD |
4757 | char *rule = vrule; |
4758 | ||
4eb0f4ab RGB |
4759 | if (unlikely(!rule)) { |
4760 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4761 | return -ENOENT; |
4762 | } | |
4763 | ||
4764 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4765 | return 0; | |
4766 | ||
2f823ff8 | 4767 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4768 | |
4769 | /* | |
4770 | * No need to do string comparisons. If a match occurs, | |
4771 | * both pointers will point to the same smack_known | |
4772 | * label. | |
4773 | */ | |
5af75d8d | 4774 | if (op == Audit_equal) |
2f823ff8 | 4775 | return (rule == skp->smk_known); |
5af75d8d | 4776 | if (op == Audit_not_equal) |
2f823ff8 | 4777 | return (rule != skp->smk_known); |
d20bdda6 AD |
4778 | |
4779 | return 0; | |
4780 | } | |
4781 | ||
491a0b08 CS |
4782 | /* |
4783 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4784 | * No memory was allocated. |
4785 | */ | |
d20bdda6 AD |
4786 | |
4787 | #endif /* CONFIG_AUDIT */ | |
4788 | ||
746df9b5 DQ |
4789 | /** |
4790 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4791 | * @name: Full xattr name to check. | |
4792 | */ | |
4793 | static int smack_ismaclabel(const char *name) | |
4794 | { | |
4795 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4796 | } | |
4797 | ||
4798 | ||
251a2a95 | 4799 | /** |
e114e473 CS |
4800 | * smack_secid_to_secctx - return the smack label for a secid |
4801 | * @secid: incoming integer | |
4802 | * @secdata: destination | |
4803 | * @seclen: how long it is | |
4804 | * | |
4805 | * Exists for networking code. | |
4806 | */ | |
4807 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4808 | { | |
2f823ff8 | 4809 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4810 | |
d5630b9d | 4811 | if (secdata) |
2f823ff8 CS |
4812 | *secdata = skp->smk_known; |
4813 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4814 | return 0; |
4815 | } | |
4816 | ||
251a2a95 | 4817 | /** |
4bc87e62 CS |
4818 | * smack_secctx_to_secid - return the secid for a smack label |
4819 | * @secdata: smack label | |
4820 | * @seclen: how long result is | |
4821 | * @secid: outgoing integer | |
4822 | * | |
4823 | * Exists for audit and networking code. | |
4824 | */ | |
e52c1764 | 4825 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4826 | { |
21c7eae2 LP |
4827 | struct smack_known *skp = smk_find_entry(secdata); |
4828 | ||
4829 | if (skp) | |
4830 | *secid = skp->smk_secid; | |
4831 | else | |
4832 | *secid = 0; | |
4bc87e62 CS |
4833 | return 0; |
4834 | } | |
4835 | ||
491a0b08 CS |
4836 | /* |
4837 | * There used to be a smack_release_secctx hook | |
4838 | * that did nothing back when hooks were in a vector. | |
4839 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4840 | */ |
e114e473 | 4841 | |
1ee65e37 DQ |
4842 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4843 | { | |
c7c7a1a1 TA |
4844 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, |
4845 | ctxlen, 0); | |
1ee65e37 DQ |
4846 | } |
4847 | ||
4848 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4849 | { | |
39f60c1c | 4850 | return __vfs_setxattr_noperm(&nop_mnt_idmap, dentry, XATTR_NAME_SMACK, |
c7c7a1a1 | 4851 | ctx, ctxlen, 0); |
1ee65e37 DQ |
4852 | } |
4853 | ||
4854 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4855 | { | |
0f8983cf | 4856 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4857 | |
0f8983cf CS |
4858 | *ctx = skp->smk_known; |
4859 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4860 | return 0; |
4861 | } | |
4862 | ||
d6d80cb5 CS |
4863 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4864 | { | |
4865 | ||
4866 | struct task_smack *tsp; | |
4867 | struct smack_known *skp; | |
4868 | struct inode_smack *isp; | |
4869 | struct cred *new_creds = *new; | |
4870 | ||
4871 | if (new_creds == NULL) { | |
4872 | new_creds = prepare_creds(); | |
4873 | if (new_creds == NULL) | |
4874 | return -ENOMEM; | |
4875 | } | |
4876 | ||
b17103a8 | 4877 | tsp = smack_cred(new_creds); |
d6d80cb5 CS |
4878 | |
4879 | /* | |
4880 | * Get label from overlay inode and set it in create_sid | |
4881 | */ | |
387ef964 | 4882 | isp = smack_inode(d_inode(dentry)); |
d6d80cb5 CS |
4883 | skp = isp->smk_inode; |
4884 | tsp->smk_task = skp; | |
4885 | *new = new_creds; | |
4886 | return 0; | |
4887 | } | |
4888 | ||
4889 | static int smack_inode_copy_up_xattr(const char *name) | |
4890 | { | |
4891 | /* | |
4892 | * Return 1 if this is the smack access Smack attribute. | |
4893 | */ | |
4894 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4895 | return 1; | |
4896 | ||
4897 | return -EOPNOTSUPP; | |
4898 | } | |
4899 | ||
4900 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4901 | struct qstr *name, | |
4902 | const struct cred *old, | |
4903 | struct cred *new) | |
4904 | { | |
b17103a8 CS |
4905 | struct task_smack *otsp = smack_cred(old); |
4906 | struct task_smack *ntsp = smack_cred(new); | |
d6d80cb5 CS |
4907 | struct inode_smack *isp; |
4908 | int may; | |
4909 | ||
4910 | /* | |
4911 | * Use the process credential unless all of | |
4912 | * the transmuting criteria are met | |
4913 | */ | |
4914 | ntsp->smk_task = otsp->smk_task; | |
4915 | ||
4916 | /* | |
4917 | * the attribute of the containing directory | |
4918 | */ | |
fb4021b6 | 4919 | isp = smack_inode(d_inode(dentry->d_parent)); |
d6d80cb5 CS |
4920 | |
4921 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4922 | rcu_read_lock(); | |
4923 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4924 | isp->smk_inode->smk_known, | |
4925 | &otsp->smk_task->smk_rules); | |
4926 | rcu_read_unlock(); | |
4927 | ||
4928 | /* | |
4929 | * If the directory is transmuting and the rule | |
4930 | * providing access is transmuting use the containing | |
4931 | * directory label instead of the process label. | |
4932 | */ | |
2c085f3a | 4933 | if (may > 0 && (may & MAY_TRANSMUTE)) { |
d6d80cb5 | 4934 | ntsp->smk_task = isp->smk_inode; |
2c085f3a RS |
4935 | ntsp->smk_transmuted = ntsp->smk_task; |
4936 | } | |
d6d80cb5 CS |
4937 | } |
4938 | return 0; | |
4939 | } | |
4940 | ||
d9d8c939 CS |
4941 | #ifdef CONFIG_IO_URING |
4942 | /** | |
4943 | * smack_uring_override_creds - Is io_uring cred override allowed? | |
4944 | * @new: the target creds | |
4945 | * | |
4946 | * Check to see if the current task is allowed to override it's credentials | |
4947 | * to service an io_uring operation. | |
4948 | */ | |
4949 | static int smack_uring_override_creds(const struct cred *new) | |
4950 | { | |
4951 | struct task_smack *tsp = smack_cred(current_cred()); | |
4952 | struct task_smack *nsp = smack_cred(new); | |
4953 | ||
4954 | /* | |
4955 | * Allow the degenerate case where the new Smack value is | |
4956 | * the same as the current Smack value. | |
4957 | */ | |
4958 | if (tsp->smk_task == nsp->smk_task) | |
4959 | return 0; | |
4960 | ||
4961 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) | |
4962 | return 0; | |
4963 | ||
4964 | return -EPERM; | |
4965 | } | |
4966 | ||
4967 | /** | |
4968 | * smack_uring_sqpoll - check if a io_uring polling thread can be created | |
4969 | * | |
4970 | * Check to see if the current task is allowed to create a new io_uring | |
4971 | * kernel polling thread. | |
4972 | */ | |
4973 | static int smack_uring_sqpoll(void) | |
4974 | { | |
4975 | if (smack_privileged_cred(CAP_MAC_ADMIN, current_cred())) | |
4976 | return 0; | |
4977 | ||
4978 | return -EPERM; | |
4979 | } | |
4980 | ||
dd937340 CS |
4981 | /** |
4982 | * smack_uring_cmd - check on file operations for io_uring | |
4983 | * @ioucmd: the command in question | |
4984 | * | |
4985 | * Make a best guess about whether a io_uring "command" should | |
4986 | * be allowed. Use the same logic used for determining if the | |
4987 | * file could be opened for read in the absence of better criteria. | |
4988 | */ | |
4989 | static int smack_uring_cmd(struct io_uring_cmd *ioucmd) | |
4990 | { | |
4991 | struct file *file = ioucmd->file; | |
4992 | struct smk_audit_info ad; | |
4993 | struct task_smack *tsp; | |
4994 | struct inode *inode; | |
4995 | int rc; | |
4996 | ||
4997 | if (!file) | |
4998 | return -EINVAL; | |
4999 | ||
5000 | tsp = smack_cred(file->f_cred); | |
5001 | inode = file_inode(file); | |
5002 | ||
5003 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); | |
5004 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5005 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); | |
5006 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); | |
5007 | ||
5008 | return rc; | |
5009 | } | |
5010 | ||
d9d8c939 CS |
5011 | #endif /* CONFIG_IO_URING */ |
5012 | ||
f22f9aaf | 5013 | struct lsm_blob_sizes smack_blob_sizes __ro_after_init = { |
bbd3662a | 5014 | .lbs_cred = sizeof(struct task_smack), |
33bf60ca | 5015 | .lbs_file = sizeof(struct smack_known *), |
afb1cbe3 | 5016 | .lbs_inode = sizeof(struct inode_smack), |
ecd5f82e CS |
5017 | .lbs_ipc = sizeof(struct smack_known *), |
5018 | .lbs_msg_msg = sizeof(struct smack_known *), | |
1aea7808 | 5019 | .lbs_superblock = sizeof(struct superblock_smack), |
6bcdfd2c | 5020 | .lbs_xattr_count = SMACK_INODE_INIT_XATTRS, |
bbd3662a CS |
5021 | }; |
5022 | ||
b1a867ee | 5023 | static const struct lsm_id smack_lsmid = { |
f3b8788c CS |
5024 | .name = "smack", |
5025 | .id = LSM_ID_SMACK, | |
5026 | }; | |
5027 | ||
f22f9aaf | 5028 | static struct security_hook_list smack_hooks[] __ro_after_init = { |
e20b043a CS |
5029 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
5030 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
5031 | LSM_HOOK_INIT(syslog, smack_syslog), | |
5032 | ||
d80a8f1b | 5033 | LSM_HOOK_INIT(fs_context_submount, smack_fs_context_submount), |
0b52075e | 5034 | LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup), |
2febd254 DH |
5035 | LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param), |
5036 | ||
e20b043a | 5037 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), |
204cc0cc | 5038 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 5039 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 5040 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 5041 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a | 5042 | |
b8bff599 | 5043 | LSM_HOOK_INIT(bprm_creds_for_exec, smack_bprm_creds_for_exec), |
e20b043a CS |
5044 | |
5045 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
e20b043a CS |
5046 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), |
5047 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
5048 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
5049 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
5050 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
5051 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
5052 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
5053 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
5054 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
5055 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
5056 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
5057 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
44faac01 CB |
5058 | LSM_HOOK_INIT(inode_set_acl, smack_inode_set_acl), |
5059 | LSM_HOOK_INIT(inode_get_acl, smack_inode_get_acl), | |
5060 | LSM_HOOK_INIT(inode_remove_acl, smack_inode_remove_acl), | |
e20b043a CS |
5061 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), |
5062 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
5063 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
5064 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
5065 | ||
e20b043a | 5066 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
e20b043a | 5067 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), |
f1bb47a3 | 5068 | LSM_HOOK_INIT(file_ioctl_compat, smack_file_ioctl), |
e20b043a CS |
5069 | LSM_HOOK_INIT(file_lock, smack_file_lock), |
5070 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
5071 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
5072 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
5073 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
5074 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
5075 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
5076 | ||
5077 | LSM_HOOK_INIT(file_open, smack_file_open), | |
5078 | ||
5079 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
5080 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
5081 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
5082 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 5083 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
5084 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
5085 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
5086 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
5087 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
5088 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
6326948f | 5089 | LSM_HOOK_INIT(current_getsecid_subj, smack_current_getsecid_subj), |
1fb057dc | 5090 | LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj), |
e20b043a CS |
5091 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), |
5092 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
5093 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
5094 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
5095 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
5096 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
5097 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
5098 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
5099 | ||
5100 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
5101 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
5102 | ||
5103 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
e20b043a | 5104 | |
0d79cbf8 | 5105 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
5106 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
5107 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
5108 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
5109 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
5110 | ||
0d79cbf8 | 5111 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
5112 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
5113 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
5114 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
5115 | ||
0d79cbf8 | 5116 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
5117 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
5118 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
5119 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
5120 | ||
5121 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
5122 | ||
38b323e5 CS |
5123 | LSM_HOOK_INIT(getselfattr, smack_getselfattr), |
5124 | LSM_HOOK_INIT(setselfattr, smack_setselfattr), | |
e20b043a CS |
5125 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), |
5126 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
5127 | ||
5128 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
5129 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
5130 | ||
5131 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 5132 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 5133 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 5134 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 5135 | #endif |
e20b043a CS |
5136 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
5137 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
5138 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
5139 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
5140 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
5141 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
5142 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4ca165fc | 5143 | LSM_HOOK_INIT(sk_clone_security, smack_sk_clone_security), |
e20b043a CS |
5144 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), |
5145 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
5146 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 5147 | |
e114e473 CS |
5148 | /* key management security hooks */ |
5149 | #ifdef CONFIG_KEYS | |
e20b043a CS |
5150 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
5151 | LSM_HOOK_INIT(key_free, smack_key_free), | |
5152 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
5153 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
a8478a60 DH |
5154 | #ifdef CONFIG_KEY_NOTIFICATIONS |
5155 | LSM_HOOK_INIT(watch_key, smack_watch_key), | |
5156 | #endif | |
e114e473 | 5157 | #endif /* CONFIG_KEYS */ |
d20bdda6 | 5158 | |
a8478a60 DH |
5159 | #ifdef CONFIG_WATCH_QUEUE |
5160 | LSM_HOOK_INIT(post_notification, smack_post_notification), | |
5161 | #endif | |
5162 | ||
d20bdda6 AD |
5163 | /* Audit hooks */ |
5164 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
5165 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
5166 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
5167 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
5168 | #endif /* CONFIG_AUDIT */ |
5169 | ||
e20b043a CS |
5170 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
5171 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
5172 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
5173 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
5174 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
5175 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
5176 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
5177 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
5178 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
d9d8c939 CS |
5179 | #ifdef CONFIG_IO_URING |
5180 | LSM_HOOK_INIT(uring_override_creds, smack_uring_override_creds), | |
5181 | LSM_HOOK_INIT(uring_sqpoll, smack_uring_sqpoll), | |
dd937340 | 5182 | LSM_HOOK_INIT(uring_cmd, smack_uring_cmd), |
d9d8c939 | 5183 | #endif |
e114e473 CS |
5184 | }; |
5185 | ||
7198e2ee | 5186 | |
86812bb0 | 5187 | static __init void init_smack_known_list(void) |
7198e2ee | 5188 | { |
86812bb0 CS |
5189 | /* |
5190 | * Initialize rule list locks | |
5191 | */ | |
5192 | mutex_init(&smack_known_huh.smk_rules_lock); | |
5193 | mutex_init(&smack_known_hat.smk_rules_lock); | |
5194 | mutex_init(&smack_known_floor.smk_rules_lock); | |
5195 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
5196 | mutex_init(&smack_known_web.smk_rules_lock); |
5197 | /* | |
5198 | * Initialize rule lists | |
5199 | */ | |
5200 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
5201 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
5202 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
5203 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
5204 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
5205 | /* | |
5206 | * Create the known labels list | |
5207 | */ | |
4d7cf4a1 TS |
5208 | smk_insert_entry(&smack_known_huh); |
5209 | smk_insert_entry(&smack_known_hat); | |
5210 | smk_insert_entry(&smack_known_star); | |
5211 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 5212 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
5213 | } |
5214 | ||
e114e473 CS |
5215 | /** |
5216 | * smack_init - initialize the smack system | |
5217 | * | |
a1a07f22 | 5218 | * Returns 0 on success, -ENOMEM is there's no memory |
e114e473 CS |
5219 | */ |
5220 | static __init int smack_init(void) | |
5221 | { | |
bbd3662a | 5222 | struct cred *cred = (struct cred *) current->cred; |
676dac4b | 5223 | struct task_smack *tsp; |
d84f4f99 | 5224 | |
4e328b08 | 5225 | smack_rule_cache = KMEM_CACHE(smack_rule, 0); |
4ca75287 | 5226 | if (!smack_rule_cache) |
4e328b08 | 5227 | return -ENOMEM; |
4e328b08 | 5228 | |
bbd3662a CS |
5229 | /* |
5230 | * Set the security state for the initial task. | |
5231 | */ | |
5232 | tsp = smack_cred(cred); | |
5233 | init_task_smack(tsp, &smack_known_floor, &smack_known_floor); | |
5234 | ||
5235 | /* | |
5236 | * Register with LSM | |
5237 | */ | |
f3b8788c | 5238 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), &smack_lsmid); |
d21b7b04 JB |
5239 | smack_enabled = 1; |
5240 | ||
21abb1ec CS |
5241 | pr_info("Smack: Initializing.\n"); |
5242 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
5243 | pr_info("Smack: Netfilter enabled.\n"); | |
5244 | #endif | |
5245 | #ifdef SMACK_IPV6_PORT_LABELING | |
5246 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
5247 | #endif | |
5248 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
5249 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
5250 | #endif | |
e114e473 | 5251 | |
86812bb0 CS |
5252 | /* initialize the smack_known_list */ |
5253 | init_smack_known_list(); | |
e114e473 | 5254 | |
e114e473 CS |
5255 | return 0; |
5256 | } | |
5257 | ||
5258 | /* | |
5259 | * Smack requires early initialization in order to label | |
5260 | * all processes and objects when they are created. | |
5261 | */ | |
3d6e5f6d | 5262 | DEFINE_LSM(smack) = { |
07aed2f2 | 5263 | .name = "smack", |
14bd99c8 | 5264 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
bbd3662a | 5265 | .blobs = &smack_blob_sizes, |
3d6e5f6d KC |
5266 | .init = smack_init, |
5267 | }; |