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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> | |
40 | #include <linux/binfmts.h> | |
3bf2789c | 41 | #include <linux/parser.h> |
2febd254 DH |
42 | #include <linux/fs_context.h> |
43 | #include <linux/fs_parser.h> | |
a8478a60 | 44 | #include <linux/watch_queue.h> |
dd937340 | 45 | #include <linux/io_uring.h> |
e114e473 CS |
46 | #include "smack.h" |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
baed456a RS |
55 | /* |
56 | * Smack uses multiple xattrs. | |
57 | * SMACK64 - for access control, | |
58 | * SMACK64TRANSMUTE - label initialization, | |
59 | * Not saved on files - SMACK64IPIN and SMACK64IPOUT, | |
60 | * Must be set explicitly - SMACK64EXEC and SMACK64MMAP | |
61 | */ | |
62 | #define SMACK_INODE_INIT_XATTRS 2 | |
6bcdfd2c | 63 | |
222a96b3 | 64 | #ifdef SMACK_IPV6_PORT_LABELING |
00720f0e | 65 | static DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 66 | static LIST_HEAD(smk_ipv6_port_list); |
222a96b3 | 67 | #endif |
4e328b08 | 68 | struct kmem_cache *smack_rule_cache; |
bfc3cac0 | 69 | int smack_enabled __initdata; |
c6739443 | 70 | |
c3300aaf AV |
71 | #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s} |
72 | static struct { | |
73 | const char *name; | |
74 | int len; | |
75 | int opt; | |
76 | } smk_mount_opts[] = { | |
6e7739fc | 77 | {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault}, |
c3300aaf | 78 | A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute) |
3bf2789c | 79 | }; |
c3300aaf AV |
80 | #undef A |
81 | ||
82 | static int match_opt_prefix(char *s, int l, char **arg) | |
83 | { | |
84 | int i; | |
85 | ||
86 | for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) { | |
87 | size_t len = smk_mount_opts[i].len; | |
88 | if (len > l || memcmp(s, smk_mount_opts[i].name, len)) | |
89 | continue; | |
90 | if (len == l || s[len] != '=') | |
91 | continue; | |
92 | *arg = s + len + 1; | |
93 | return smk_mount_opts[i].opt; | |
94 | } | |
95 | return Opt_error; | |
96 | } | |
3bf2789c | 97 | |
3d04c924 CS |
98 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
99 | static char *smk_bu_mess[] = { | |
100 | "Bringup Error", /* Unused */ | |
101 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
102 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
103 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
104 | }; | |
105 | ||
d166c802 CS |
106 | static void smk_bu_mode(int mode, char *s) |
107 | { | |
108 | int i = 0; | |
109 | ||
110 | if (mode & MAY_READ) | |
111 | s[i++] = 'r'; | |
112 | if (mode & MAY_WRITE) | |
113 | s[i++] = 'w'; | |
114 | if (mode & MAY_EXEC) | |
115 | s[i++] = 'x'; | |
116 | if (mode & MAY_APPEND) | |
117 | s[i++] = 'a'; | |
118 | if (mode & MAY_TRANSMUTE) | |
119 | s[i++] = 't'; | |
120 | if (mode & MAY_LOCK) | |
121 | s[i++] = 'l'; | |
122 | if (i == 0) | |
123 | s[i++] = '-'; | |
124 | s[i] = '\0'; | |
125 | } | |
126 | #endif | |
127 | ||
128 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
129 | static int smk_bu_note(char *note, struct smack_known *sskp, |
130 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
131 | { |
132 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
133 | ||
134 | if (rc <= 0) | |
135 | return rc; | |
bf4b2fee CS |
136 | if (rc > SMACK_UNCONFINED_OBJECT) |
137 | rc = 0; | |
d166c802 CS |
138 | |
139 | smk_bu_mode(mode, acc); | |
bf4b2fee | 140 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 141 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
142 | return 0; |
143 | } | |
144 | #else | |
21c7eae2 | 145 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
146 | #endif |
147 | ||
148 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
149 | static int smk_bu_current(char *note, struct smack_known *oskp, |
150 | int mode, int rc) | |
d166c802 | 151 | { |
b17103a8 | 152 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 CS |
153 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
154 | ||
155 | if (rc <= 0) | |
156 | return rc; | |
bf4b2fee CS |
157 | if (rc > SMACK_UNCONFINED_OBJECT) |
158 | rc = 0; | |
d166c802 CS |
159 | |
160 | smk_bu_mode(mode, acc); | |
bf4b2fee | 161 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
162 | tsp->smk_task->smk_known, oskp->smk_known, |
163 | acc, current->comm, note); | |
d166c802 CS |
164 | return 0; |
165 | } | |
166 | #else | |
21c7eae2 | 167 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
168 | #endif |
169 | ||
170 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
171 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
172 | { | |
b17103a8 | 173 | struct task_smack *tsp = smack_cred(current_cred()); |
1fb057dc | 174 | struct smack_known *smk_task = smk_of_task_struct_obj(otp); |
d166c802 CS |
175 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
176 | ||
177 | if (rc <= 0) | |
178 | return rc; | |
bf4b2fee CS |
179 | if (rc > SMACK_UNCONFINED_OBJECT) |
180 | rc = 0; | |
d166c802 CS |
181 | |
182 | smk_bu_mode(mode, acc); | |
bf4b2fee | 183 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 184 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
185 | current->comm, otp->comm); |
186 | return 0; | |
187 | } | |
188 | #else | |
189 | #define smk_bu_task(otp, mode, RC) (RC) | |
190 | #endif | |
191 | ||
192 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
193 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
194 | { | |
b17103a8 | 195 | struct task_smack *tsp = smack_cred(current_cred()); |
fb4021b6 | 196 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
197 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
198 | ||
bf4b2fee CS |
199 | if (isp->smk_flags & SMK_INODE_IMPURE) |
200 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
201 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
202 | ||
d166c802 CS |
203 | if (rc <= 0) |
204 | return rc; | |
bf4b2fee CS |
205 | if (rc > SMACK_UNCONFINED_OBJECT) |
206 | rc = 0; | |
207 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
208 | (mode & (MAY_WRITE | MAY_APPEND))) | |
209 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
210 | |
211 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
212 | |
213 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
214 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
215 | inode->i_sb->s_id, inode->i_ino, current->comm); |
216 | return 0; | |
217 | } | |
218 | #else | |
219 | #define smk_bu_inode(inode, mode, RC) (RC) | |
220 | #endif | |
221 | ||
222 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
223 | static int smk_bu_file(struct file *file, int mode, int rc) | |
224 | { | |
b17103a8 | 225 | struct task_smack *tsp = smack_cred(current_cred()); |
d166c802 | 226 | struct smack_known *sskp = tsp->smk_task; |
5e7270a6 | 227 | struct inode *inode = file_inode(file); |
fb4021b6 | 228 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
229 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
230 | ||
bf4b2fee CS |
231 | if (isp->smk_flags & SMK_INODE_IMPURE) |
232 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
233 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
234 | ||
d166c802 CS |
235 | if (rc <= 0) |
236 | return rc; | |
bf4b2fee CS |
237 | if (rc > SMACK_UNCONFINED_OBJECT) |
238 | rc = 0; | |
d166c802 CS |
239 | |
240 | smk_bu_mode(mode, acc); | |
bf4b2fee | 241 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 242 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 243 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
244 | current->comm); |
245 | return 0; | |
246 | } | |
247 | #else | |
248 | #define smk_bu_file(file, mode, RC) (RC) | |
249 | #endif | |
250 | ||
251 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
252 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
253 | int mode, int rc) | |
254 | { | |
b17103a8 | 255 | struct task_smack *tsp = smack_cred(cred); |
d166c802 | 256 | struct smack_known *sskp = tsp->smk_task; |
45063097 | 257 | struct inode *inode = file_inode(file); |
fb4021b6 | 258 | struct inode_smack *isp = smack_inode(inode); |
d166c802 CS |
259 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
260 | ||
bf4b2fee CS |
261 | if (isp->smk_flags & SMK_INODE_IMPURE) |
262 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
263 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
264 | ||
d166c802 CS |
265 | if (rc <= 0) |
266 | return rc; | |
bf4b2fee CS |
267 | if (rc > SMACK_UNCONFINED_OBJECT) |
268 | rc = 0; | |
d166c802 CS |
269 | |
270 | smk_bu_mode(mode, acc); | |
bf4b2fee | 271 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 272 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 273 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
274 | current->comm); |
275 | return 0; | |
276 | } | |
277 | #else | |
278 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
279 | #endif | |
280 | ||
e114e473 CS |
281 | /** |
282 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 283 | * @name: type of the label (attribute) |
e114e473 CS |
284 | * @ip: a pointer to the inode |
285 | * @dp: a pointer to the dentry | |
286 | * | |
e774ad68 LP |
287 | * Returns a pointer to the master list entry for the Smack label, |
288 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 289 | */ |
2f823ff8 CS |
290 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
291 | struct dentry *dp) | |
e114e473 CS |
292 | { |
293 | int rc; | |
f7112e6c | 294 | char *buffer; |
2f823ff8 | 295 | struct smack_known *skp = NULL; |
e114e473 | 296 | |
5d6c3191 | 297 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 298 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 299 | |
e5bfad3d | 300 | buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS); |
f7112e6c | 301 | if (buffer == NULL) |
e774ad68 | 302 | return ERR_PTR(-ENOMEM); |
e114e473 | 303 | |
5d6c3191 | 304 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
305 | if (rc < 0) |
306 | skp = ERR_PTR(rc); | |
307 | else if (rc == 0) | |
308 | skp = NULL; | |
309 | else | |
2f823ff8 | 310 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
311 | |
312 | kfree(buffer); | |
313 | ||
2f823ff8 | 314 | return skp; |
e114e473 CS |
315 | } |
316 | ||
317 | /** | |
afb1cbe3 | 318 | * init_inode_smack - initialize an inode security blob |
a1a07f22 | 319 | * @inode: inode to extract the info from |
21c7eae2 | 320 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 | 321 | * |
e114e473 | 322 | */ |
afb1cbe3 | 323 | static void init_inode_smack(struct inode *inode, struct smack_known *skp) |
e114e473 | 324 | { |
afb1cbe3 | 325 | struct inode_smack *isp = smack_inode(inode); |
e114e473 | 326 | |
21c7eae2 | 327 | isp->smk_inode = skp; |
e114e473 | 328 | isp->smk_flags = 0; |
e114e473 CS |
329 | } |
330 | ||
7898e1f8 | 331 | /** |
bbd3662a CS |
332 | * init_task_smack - initialize a task security blob |
333 | * @tsp: blob to initialize | |
1a28979b LP |
334 | * @task: a pointer to the Smack label for the running task |
335 | * @forked: a pointer to the Smack label for the forked task | |
7898e1f8 | 336 | * |
7898e1f8 | 337 | */ |
bbd3662a CS |
338 | static void init_task_smack(struct task_smack *tsp, struct smack_known *task, |
339 | struct smack_known *forked) | |
7898e1f8 | 340 | { |
7898e1f8 CS |
341 | tsp->smk_task = task; |
342 | tsp->smk_forked = forked; | |
343 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 344 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 | 345 | mutex_init(&tsp->smk_rules_lock); |
7898e1f8 CS |
346 | } |
347 | ||
348 | /** | |
349 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
350 | * @nhead: new rules header pointer |
351 | * @ohead: old rules header pointer | |
352 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
353 | * |
354 | * Returns 0 on success, -ENOMEM on error | |
355 | */ | |
356 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
357 | gfp_t gfp) | |
358 | { | |
359 | struct smack_rule *nrp; | |
360 | struct smack_rule *orp; | |
361 | int rc = 0; | |
362 | ||
7898e1f8 | 363 | list_for_each_entry_rcu(orp, ohead, list) { |
4e328b08 | 364 | nrp = kmem_cache_zalloc(smack_rule_cache, gfp); |
7898e1f8 CS |
365 | if (nrp == NULL) { |
366 | rc = -ENOMEM; | |
367 | break; | |
368 | } | |
369 | *nrp = *orp; | |
370 | list_add_rcu(&nrp->list, nhead); | |
371 | } | |
372 | return rc; | |
373 | } | |
374 | ||
38416e53 ZJ |
375 | /** |
376 | * smk_copy_relabel - copy smk_relabel labels list | |
377 | * @nhead: new rules header pointer | |
378 | * @ohead: old rules header pointer | |
379 | * @gfp: type of the memory for the allocation | |
380 | * | |
381 | * Returns 0 on success, -ENOMEM on error | |
382 | */ | |
383 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
384 | gfp_t gfp) | |
385 | { | |
386 | struct smack_known_list_elem *nklep; | |
387 | struct smack_known_list_elem *oklep; | |
388 | ||
38416e53 ZJ |
389 | list_for_each_entry(oklep, ohead, list) { |
390 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
391 | if (nklep == NULL) { | |
392 | smk_destroy_label_list(nhead); | |
393 | return -ENOMEM; | |
394 | } | |
395 | nklep->smk_label = oklep->smk_label; | |
396 | list_add(&nklep->list, nhead); | |
397 | } | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
5663884c LP |
402 | /** |
403 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
b57d0209 | 404 | * @mode: input mode in form of PTRACE_MODE_* |
5663884c LP |
405 | * |
406 | * Returns a converted MAY_* mode usable by smack rules | |
407 | */ | |
408 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
409 | { | |
3dfb7d8c | 410 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 411 | return MAY_READWRITE; |
3dfb7d8c JH |
412 | if (mode & PTRACE_MODE_READ) |
413 | return MAY_READ; | |
5663884c LP |
414 | |
415 | return 0; | |
416 | } | |
417 | ||
418 | /** | |
419 | * smk_ptrace_rule_check - helper for ptrace access | |
420 | * @tracer: tracer process | |
21c7eae2 | 421 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
422 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
423 | * @func: name of the function that called us, used for audit | |
424 | * | |
425 | * Returns 0 on access granted, -error on error | |
426 | */ | |
21c7eae2 LP |
427 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
428 | struct smack_known *tracee_known, | |
5663884c LP |
429 | unsigned int mode, const char *func) |
430 | { | |
431 | int rc; | |
432 | struct smk_audit_info ad, *saip = NULL; | |
433 | struct task_smack *tsp; | |
21c7eae2 | 434 | struct smack_known *tracer_known; |
dcb569cf | 435 | const struct cred *tracercred; |
5663884c LP |
436 | |
437 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
438 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
439 | smk_ad_setfield_u_tsk(&ad, tracer); | |
440 | saip = &ad; | |
441 | } | |
442 | ||
6d1cff2a | 443 | rcu_read_lock(); |
dcb569cf | 444 | tracercred = __task_cred(tracer); |
b17103a8 | 445 | tsp = smack_cred(tracercred); |
21c7eae2 | 446 | tracer_known = smk_of_task(tsp); |
5663884c | 447 | |
66867818 LP |
448 | if ((mode & PTRACE_MODE_ATTACH) && |
449 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
450 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 451 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
452 | rc = 0; |
453 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
454 | rc = -EACCES; | |
dcb569cf | 455 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
456 | rc = 0; |
457 | else | |
458 | rc = -EACCES; | |
459 | ||
460 | if (saip) | |
21c7eae2 LP |
461 | smack_log(tracer_known->smk_known, |
462 | tracee_known->smk_known, | |
463 | 0, rc, saip); | |
66867818 | 464 | |
6d1cff2a | 465 | rcu_read_unlock(); |
66867818 LP |
466 | return rc; |
467 | } | |
468 | ||
469 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 470 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
471 | |
472 | rcu_read_unlock(); | |
5663884c LP |
473 | return rc; |
474 | } | |
475 | ||
e114e473 CS |
476 | /* |
477 | * LSM hooks. | |
478 | * We he, that is fun! | |
479 | */ | |
480 | ||
481 | /** | |
9e48858f | 482 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 483 | * @ctp: child task pointer |
5663884c | 484 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
485 | * |
486 | * Returns 0 if access is OK, an error code otherwise | |
487 | * | |
5663884c | 488 | * Do the capability checks. |
e114e473 | 489 | */ |
9e48858f | 490 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 491 | { |
2f823ff8 | 492 | struct smack_known *skp; |
e114e473 | 493 | |
1fb057dc | 494 | skp = smk_of_task_struct_obj(ctp); |
ecfcc53f | 495 | |
b1d9e6b0 | 496 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
497 | } |
498 | ||
499 | /** | |
500 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
501 | * @ptp: parent task pointer | |
502 | * | |
503 | * Returns 0 if access is OK, an error code otherwise | |
504 | * | |
5663884c | 505 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
506 | */ |
507 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
508 | { | |
2f823ff8 | 509 | struct smack_known *skp; |
5cd9c58f | 510 | |
b17103a8 | 511 | skp = smk_of_task(smack_cred(current_cred())); |
ecfcc53f | 512 | |
d3f84f5c | 513 | return smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
514 | } |
515 | ||
516 | /** | |
517 | * smack_syslog - Smack approval on syslog | |
a1a07f22 | 518 | * @typefrom_file: unused |
e114e473 | 519 | * |
e114e473 CS |
520 | * Returns 0 on success, error code otherwise. |
521 | */ | |
12b3052c | 522 | static int smack_syslog(int typefrom_file) |
e114e473 | 523 | { |
12b3052c | 524 | int rc = 0; |
2f823ff8 | 525 | struct smack_known *skp = smk_of_current(); |
e114e473 | 526 | |
1880eff7 | 527 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
528 | return 0; |
529 | ||
24ea1b6e | 530 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
531 | rc = -EACCES; |
532 | ||
533 | return rc; | |
534 | } | |
535 | ||
e114e473 CS |
536 | /* |
537 | * Superblock Hooks. | |
538 | */ | |
539 | ||
540 | /** | |
541 | * smack_sb_alloc_security - allocate a superblock blob | |
542 | * @sb: the superblock getting the blob | |
543 | * | |
544 | * Returns 0 on success or -ENOMEM on error. | |
545 | */ | |
546 | static int smack_sb_alloc_security(struct super_block *sb) | |
547 | { | |
1aea7808 | 548 | struct superblock_smack *sbsp = smack_superblock(sb); |
e114e473 | 549 | |
21c7eae2 LP |
550 | sbsp->smk_root = &smack_known_floor; |
551 | sbsp->smk_default = &smack_known_floor; | |
552 | sbsp->smk_floor = &smack_known_floor; | |
553 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 554 | /* |
9f50eda2 | 555 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 556 | */ |
e114e473 CS |
557 | |
558 | return 0; | |
559 | } | |
560 | ||
12085b14 | 561 | struct smack_mnt_opts { |
de93e515 CS |
562 | const char *fsdefault; |
563 | const char *fsfloor; | |
564 | const char *fshat; | |
565 | const char *fsroot; | |
566 | const char *fstransmute; | |
12085b14 | 567 | }; |
e114e473 | 568 | |
204cc0cc AV |
569 | static void smack_free_mnt_opts(void *mnt_opts) |
570 | { | |
de93e515 | 571 | kfree(mnt_opts); |
204cc0cc | 572 | } |
e114e473 | 573 | |
55c0e5bd AV |
574 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
575 | { | |
576 | struct smack_mnt_opts *opts = *mnt_opts; | |
de93e515 | 577 | struct smack_known *skp; |
e114e473 | 578 | |
55c0e5bd AV |
579 | if (!opts) { |
580 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
581 | if (!opts) | |
582 | return -ENOMEM; | |
583 | *mnt_opts = opts; | |
e114e473 | 584 | } |
55c0e5bd AV |
585 | if (!s) |
586 | return -ENOMEM; | |
e114e473 | 587 | |
de93e515 CS |
588 | skp = smk_import_entry(s, 0); |
589 | if (IS_ERR(skp)) | |
590 | return PTR_ERR(skp); | |
591 | ||
55c0e5bd AV |
592 | switch (token) { |
593 | case Opt_fsdefault: | |
594 | if (opts->fsdefault) | |
595 | goto out_opt_err; | |
de93e515 | 596 | opts->fsdefault = skp->smk_known; |
55c0e5bd AV |
597 | break; |
598 | case Opt_fsfloor: | |
599 | if (opts->fsfloor) | |
600 | goto out_opt_err; | |
de93e515 | 601 | opts->fsfloor = skp->smk_known; |
55c0e5bd AV |
602 | break; |
603 | case Opt_fshat: | |
604 | if (opts->fshat) | |
605 | goto out_opt_err; | |
de93e515 | 606 | opts->fshat = skp->smk_known; |
55c0e5bd AV |
607 | break; |
608 | case Opt_fsroot: | |
609 | if (opts->fsroot) | |
610 | goto out_opt_err; | |
de93e515 | 611 | opts->fsroot = skp->smk_known; |
55c0e5bd AV |
612 | break; |
613 | case Opt_fstransmute: | |
614 | if (opts->fstransmute) | |
615 | goto out_opt_err; | |
de93e515 | 616 | opts->fstransmute = skp->smk_known; |
55c0e5bd AV |
617 | break; |
618 | } | |
e114e473 | 619 | return 0; |
55c0e5bd AV |
620 | |
621 | out_opt_err: | |
622 | pr_warn("Smack: duplicate mount options\n"); | |
623 | return -EINVAL; | |
e114e473 CS |
624 | } |
625 | ||
0b52075e AV |
626 | /** |
627 | * smack_fs_context_dup - Duplicate the security data on fs_context duplication | |
628 | * @fc: The new filesystem context. | |
629 | * @src_fc: The source filesystem context being duplicated. | |
630 | * | |
631 | * Returns 0 on success or -ENOMEM on error. | |
632 | */ | |
633 | static int smack_fs_context_dup(struct fs_context *fc, | |
634 | struct fs_context *src_fc) | |
635 | { | |
636 | struct smack_mnt_opts *dst, *src = src_fc->security; | |
637 | ||
638 | if (!src) | |
639 | return 0; | |
640 | ||
641 | fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
642 | if (!fc->security) | |
643 | return -ENOMEM; | |
de93e515 | 644 | |
0b52075e | 645 | dst = fc->security; |
de93e515 CS |
646 | dst->fsdefault = src->fsdefault; |
647 | dst->fsfloor = src->fsfloor; | |
648 | dst->fshat = src->fshat; | |
649 | dst->fsroot = src->fsroot; | |
650 | dst->fstransmute = src->fstransmute; | |
0b52075e | 651 | |
0b52075e AV |
652 | return 0; |
653 | } | |
654 | ||
d7167b14 | 655 | static const struct fs_parameter_spec smack_fs_parameters[] = { |
6e7739fc CS |
656 | fsparam_string("smackfsdef", Opt_fsdefault), |
657 | fsparam_string("smackfsdefault", Opt_fsdefault), | |
658 | fsparam_string("smackfsfloor", Opt_fsfloor), | |
659 | fsparam_string("smackfshat", Opt_fshat), | |
660 | fsparam_string("smackfsroot", Opt_fsroot), | |
661 | fsparam_string("smackfstransmute", Opt_fstransmute), | |
2febd254 DH |
662 | {} |
663 | }; | |
664 | ||
2febd254 DH |
665 | /** |
666 | * smack_fs_context_parse_param - Parse a single mount parameter | |
667 | * @fc: The new filesystem context being constructed. | |
668 | * @param: The parameter. | |
669 | * | |
670 | * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on | |
671 | * error. | |
672 | */ | |
673 | static int smack_fs_context_parse_param(struct fs_context *fc, | |
674 | struct fs_parameter *param) | |
675 | { | |
676 | struct fs_parse_result result; | |
677 | int opt, rc; | |
678 | ||
d7167b14 | 679 | opt = fs_parse(fc, smack_fs_parameters, param, &result); |
2febd254 DH |
680 | if (opt < 0) |
681 | return opt; | |
682 | ||
683 | rc = smack_add_opt(opt, param->string, &fc->security); | |
684 | if (!rc) | |
685 | param->string = NULL; | |
686 | return rc; | |
687 | } | |
688 | ||
d2497e12 | 689 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
3bf2789c | 690 | { |
d2497e12 AV |
691 | char *from = options, *to = options; |
692 | bool first = true; | |
3bf2789c | 693 | |
c3300aaf AV |
694 | while (1) { |
695 | char *next = strchr(from, ','); | |
696 | int token, len, rc; | |
697 | char *arg = NULL; | |
3bf2789c | 698 | |
c3300aaf AV |
699 | if (next) |
700 | len = next - from; | |
701 | else | |
702 | len = strlen(from); | |
3bf2789c | 703 | |
c3300aaf | 704 | token = match_opt_prefix(from, len, &arg); |
d2497e12 AV |
705 | if (token != Opt_error) { |
706 | arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL); | |
707 | rc = smack_add_opt(token, arg, mnt_opts); | |
de93e515 | 708 | kfree(arg); |
d2497e12 | 709 | if (unlikely(rc)) { |
d2497e12 AV |
710 | if (*mnt_opts) |
711 | smack_free_mnt_opts(*mnt_opts); | |
712 | *mnt_opts = NULL; | |
713 | return rc; | |
714 | } | |
715 | } else { | |
716 | if (!first) { // copy with preceding comma | |
717 | from--; | |
718 | len++; | |
719 | } | |
720 | if (to != from) | |
721 | memmove(to, from, len); | |
722 | to += len; | |
723 | first = false; | |
3bf2789c | 724 | } |
c3300aaf AV |
725 | if (!from[len]) |
726 | break; | |
727 | from += len + 1; | |
3bf2789c | 728 | } |
d2497e12 | 729 | *to = '\0'; |
3bf2789c | 730 | return 0; |
3bf2789c VT |
731 | } |
732 | ||
733 | /** | |
734 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 735 | * @sb: the file system superblock |
a1a07f22 | 736 | * @mnt_opts: Smack mount options |
3bf2789c VT |
737 | * @kern_flags: mount option from kernel space or user space |
738 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
739 | * |
740 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
741 | * |
742 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
743 | * labels. | |
e114e473 | 744 | */ |
3bf2789c | 745 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 746 | void *mnt_opts, |
3bf2789c VT |
747 | unsigned long kern_flags, |
748 | unsigned long *set_kern_flags) | |
e114e473 CS |
749 | { |
750 | struct dentry *root = sb->s_root; | |
c6f493d6 | 751 | struct inode *inode = d_backing_inode(root); |
1aea7808 | 752 | struct superblock_smack *sp = smack_superblock(sb); |
e114e473 | 753 | struct inode_smack *isp; |
24ea1b6e | 754 | struct smack_known *skp; |
12085b14 AV |
755 | struct smack_mnt_opts *opts = mnt_opts; |
756 | bool transmute = false; | |
e114e473 | 757 | |
9f50eda2 | 758 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 759 | return 0; |
eb982cb4 | 760 | |
2097f599 HS |
761 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
762 | /* | |
763 | * Unprivileged mounts don't get to specify Smack values. | |
764 | */ | |
12085b14 | 765 | if (opts) |
2097f599 HS |
766 | return -EPERM; |
767 | /* | |
768 | * Unprivileged mounts get root and default from the caller. | |
769 | */ | |
770 | skp = smk_of_current(); | |
771 | sp->smk_root = skp; | |
772 | sp->smk_default = skp; | |
773 | /* | |
774 | * For a handful of fs types with no user-controlled | |
775 | * backing store it's okay to trust security labels | |
776 | * in the filesystem. The rest are untrusted. | |
777 | */ | |
778 | if (sb->s_user_ns != &init_user_ns && | |
779 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
780 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 781 | transmute = true; |
2097f599 HS |
782 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
783 | } | |
784 | } | |
785 | ||
9f50eda2 | 786 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 787 | |
12085b14 AV |
788 | if (opts) { |
789 | if (opts->fsdefault) { | |
790 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
791 | if (IS_ERR(skp)) |
792 | return PTR_ERR(skp); | |
3bf2789c | 793 | sp->smk_default = skp; |
12085b14 AV |
794 | } |
795 | if (opts->fsfloor) { | |
796 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
797 | if (IS_ERR(skp)) |
798 | return PTR_ERR(skp); | |
799 | sp->smk_floor = skp; | |
12085b14 AV |
800 | } |
801 | if (opts->fshat) { | |
802 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
803 | if (IS_ERR(skp)) |
804 | return PTR_ERR(skp); | |
3bf2789c | 805 | sp->smk_hat = skp; |
12085b14 AV |
806 | } |
807 | if (opts->fsroot) { | |
808 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
809 | if (IS_ERR(skp)) |
810 | return PTR_ERR(skp); | |
811 | sp->smk_root = skp; | |
12085b14 AV |
812 | } |
813 | if (opts->fstransmute) { | |
814 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
815 | if (IS_ERR(skp)) |
816 | return PTR_ERR(skp); | |
817 | sp->smk_root = skp; | |
12085b14 | 818 | transmute = true; |
e114e473 CS |
819 | } |
820 | } | |
821 | ||
822 | /* | |
823 | * Initialize the root inode. | |
824 | */ | |
afb1cbe3 | 825 | init_inode_smack(inode, sp->smk_root); |
e114e473 | 826 | |
afb1cbe3 CS |
827 | if (transmute) { |
828 | isp = smack_inode(inode); | |
e830b394 | 829 | isp->smk_flags |= SMK_INODE_TRANSMUTE; |
afb1cbe3 | 830 | } |
e830b394 | 831 | |
e114e473 CS |
832 | return 0; |
833 | } | |
834 | ||
835 | /** | |
836 | * smack_sb_statfs - Smack check on statfs | |
837 | * @dentry: identifies the file system in question | |
838 | * | |
839 | * Returns 0 if current can read the floor of the filesystem, | |
840 | * and error code otherwise | |
841 | */ | |
842 | static int smack_sb_statfs(struct dentry *dentry) | |
843 | { | |
1aea7808 | 844 | struct superblock_smack *sbp = smack_superblock(dentry->d_sb); |
ecfcc53f EB |
845 | int rc; |
846 | struct smk_audit_info ad; | |
847 | ||
a269434d | 848 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 849 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 850 | |
ecfcc53f | 851 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 852 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 853 | return rc; |
e114e473 CS |
854 | } |
855 | ||
676dac4b CS |
856 | /* |
857 | * BPRM hooks | |
858 | */ | |
859 | ||
ce8a4321 | 860 | /** |
b8bff599 | 861 | * smack_bprm_creds_for_exec - Update bprm->cred if needed for exec |
ce8a4321 CS |
862 | * @bprm: the exec information |
863 | * | |
5663884c | 864 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 865 | */ |
b8bff599 | 866 | static int smack_bprm_creds_for_exec(struct linux_binprm *bprm) |
676dac4b | 867 | { |
496ad9aa | 868 | struct inode *inode = file_inode(bprm->file); |
b17103a8 | 869 | struct task_smack *bsp = smack_cred(bprm->cred); |
676dac4b | 870 | struct inode_smack *isp; |
809c02e0 | 871 | struct superblock_smack *sbsp; |
676dac4b CS |
872 | int rc; |
873 | ||
fb4021b6 | 874 | isp = smack_inode(inode); |
84088ba2 | 875 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) |
676dac4b CS |
876 | return 0; |
877 | ||
1aea7808 | 878 | sbsp = smack_superblock(inode->i_sb); |
809c02e0 SF |
879 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && |
880 | isp->smk_task != sbsp->smk_root) | |
881 | return 0; | |
882 | ||
9227dd2a | 883 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
884 | struct task_struct *tracer; |
885 | rc = 0; | |
886 | ||
887 | rcu_read_lock(); | |
888 | tracer = ptrace_parent(current); | |
889 | if (likely(tracer != NULL)) | |
890 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 891 | isp->smk_task, |
5663884c LP |
892 | PTRACE_MODE_ATTACH, |
893 | __func__); | |
894 | rcu_read_unlock(); | |
895 | ||
896 | if (rc != 0) | |
897 | return rc; | |
3675f052 JH |
898 | } |
899 | if (bprm->unsafe & ~LSM_UNSAFE_PTRACE) | |
84088ba2 | 900 | return -EPERM; |
676dac4b | 901 | |
84088ba2 JS |
902 | bsp->smk_task = isp->smk_task; |
903 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 904 | |
ccbb6e10 KC |
905 | /* Decide if this is a secure exec. */ |
906 | if (bsp->smk_task != bsp->smk_forked) | |
907 | bprm->secureexec = 1; | |
908 | ||
84088ba2 JS |
909 | return 0; |
910 | } | |
676dac4b | 911 | |
e114e473 CS |
912 | /* |
913 | * Inode hooks | |
914 | */ | |
915 | ||
916 | /** | |
917 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 918 | * @inode: the inode in need of a blob |
e114e473 | 919 | * |
a1a07f22 | 920 | * Returns 0 |
e114e473 CS |
921 | */ |
922 | static int smack_inode_alloc_security(struct inode *inode) | |
923 | { | |
2f823ff8 CS |
924 | struct smack_known *skp = smk_of_current(); |
925 | ||
afb1cbe3 | 926 | init_inode_smack(inode, skp); |
e114e473 CS |
927 | return 0; |
928 | } | |
929 | ||
e114e473 CS |
930 | /** |
931 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
932 | * @inode: the newly created inode |
933 | * @dir: containing directory object | |
2a7dba39 | 934 | * @qstr: unused |
6bcdfd2c RS |
935 | * @xattrs: where to put the attributes |
936 | * @xattr_count: current number of LSM-provided xattrs (updated) | |
e114e473 CS |
937 | * |
938 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
939 | */ | |
940 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
6bcdfd2c RS |
941 | const struct qstr *qstr, |
942 | struct xattr *xattrs, int *xattr_count) | |
e114e473 | 943 | { |
2c085f3a | 944 | struct task_smack *tsp = smack_cred(current_cred()); |
2c085f3a | 945 | struct smack_known *skp = smk_of_task(tsp); |
21c7eae2 LP |
946 | struct smack_known *isp = smk_of_inode(inode); |
947 | struct smack_known *dsp = smk_of_inode(dir); | |
6bcdfd2c | 948 | struct xattr *xattr = lsm_get_xattr_slot(xattrs, xattr_count); |
7898e1f8 | 949 | int may; |
e114e473 | 950 | |
6bcdfd2c | 951 | if (xattr) { |
2c085f3a RS |
952 | /* |
953 | * If equal, transmuting already occurred in | |
954 | * smack_dentry_create_files_as(). No need to check again. | |
955 | */ | |
956 | if (tsp->smk_task != tsp->smk_transmuted) { | |
957 | rcu_read_lock(); | |
958 | may = smk_access_entry(skp->smk_known, dsp->smk_known, | |
959 | &skp->smk_rules); | |
960 | rcu_read_unlock(); | |
961 | } | |
5c6d1125 JS |
962 | |
963 | /* | |
2c085f3a RS |
964 | * In addition to having smk_task equal to smk_transmuted, |
965 | * if the access rule allows transmutation and the directory | |
966 | * requests transmutation then by all means transmute. | |
2267b13a | 967 | * Mark the inode as changed. |
5c6d1125 | 968 | */ |
2c085f3a RS |
969 | if ((tsp->smk_task == tsp->smk_transmuted) || |
970 | (may > 0 && ((may & MAY_TRANSMUTE) != 0) && | |
971 | smk_inode_transmutable(dir))) { | |
baed456a RS |
972 | struct xattr *xattr_transmute; |
973 | ||
2c085f3a RS |
974 | /* |
975 | * The caller of smack_dentry_create_files_as() | |
976 | * should have overridden the current cred, so the | |
977 | * inode label was already set correctly in | |
978 | * smack_inode_alloc_security(). | |
979 | */ | |
980 | if (tsp->smk_task != tsp->smk_transmuted) | |
981 | isp = dsp; | |
baed456a RS |
982 | xattr_transmute = lsm_get_xattr_slot(xattrs, |
983 | xattr_count); | |
984 | if (xattr_transmute) { | |
985 | xattr_transmute->value = kmemdup(TRANS_TRUE, | |
986 | TRANS_TRUE_SIZE, | |
987 | GFP_NOFS); | |
988 | if (!xattr_transmute->value) | |
989 | return -ENOMEM; | |
990 | ||
991 | xattr_transmute->value_len = TRANS_TRUE_SIZE; | |
992 | xattr_transmute->name = XATTR_SMACK_TRANSMUTE; | |
993 | } | |
2267b13a | 994 | } |
5c6d1125 | 995 | |
6bcdfd2c RS |
996 | xattr->value = kstrdup(isp->smk_known, GFP_NOFS); |
997 | if (!xattr->value) | |
e114e473 | 998 | return -ENOMEM; |
e114e473 | 999 | |
6bcdfd2c RS |
1000 | xattr->value_len = strlen(isp->smk_known); |
1001 | xattr->name = XATTR_SMACK_SUFFIX; | |
68390ccf | 1002 | } |
e114e473 CS |
1003 | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * smack_inode_link - Smack check on link | |
1009 | * @old_dentry: the existing object | |
1010 | * @dir: unused | |
1011 | * @new_dentry: the new object | |
1012 | * | |
1013 | * Returns 0 if access is permitted, an error code otherwise | |
1014 | */ | |
1015 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1016 | struct dentry *new_dentry) | |
1017 | { | |
21c7eae2 | 1018 | struct smack_known *isp; |
ecfcc53f EB |
1019 | struct smk_audit_info ad; |
1020 | int rc; | |
1021 | ||
a269434d | 1022 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1023 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1024 | |
c6f493d6 | 1025 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1026 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1027 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1028 | |
8802565b | 1029 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1030 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1031 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1032 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1033 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1034 | } |
1035 | ||
1036 | return rc; | |
1037 | } | |
1038 | ||
1039 | /** | |
1040 | * smack_inode_unlink - Smack check on inode deletion | |
1041 | * @dir: containing directory object | |
1042 | * @dentry: file to unlink | |
1043 | * | |
1044 | * Returns 0 if current can write the containing directory | |
1045 | * and the object, error code otherwise | |
1046 | */ | |
1047 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1048 | { | |
c6f493d6 | 1049 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1050 | struct smk_audit_info ad; |
e114e473 CS |
1051 | int rc; |
1052 | ||
a269434d | 1053 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1054 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1055 | ||
e114e473 CS |
1056 | /* |
1057 | * You need write access to the thing you're unlinking | |
1058 | */ | |
ecfcc53f | 1059 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1060 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1061 | if (rc == 0) { |
e114e473 CS |
1062 | /* |
1063 | * You also need write access to the containing directory | |
1064 | */ | |
cdb56b60 | 1065 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1066 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1067 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1068 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1069 | } |
e114e473 CS |
1070 | return rc; |
1071 | } | |
1072 | ||
1073 | /** | |
1074 | * smack_inode_rmdir - Smack check on directory deletion | |
1075 | * @dir: containing directory object | |
1076 | * @dentry: directory to unlink | |
1077 | * | |
1078 | * Returns 0 if current can write the containing directory | |
1079 | * and the directory, error code otherwise | |
1080 | */ | |
1081 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1082 | { | |
ecfcc53f | 1083 | struct smk_audit_info ad; |
e114e473 CS |
1084 | int rc; |
1085 | ||
a269434d | 1086 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1087 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1088 | ||
e114e473 CS |
1089 | /* |
1090 | * You need write access to the thing you're removing | |
1091 | */ | |
c6f493d6 DH |
1092 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1093 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1094 | if (rc == 0) { |
e114e473 CS |
1095 | /* |
1096 | * You also need write access to the containing directory | |
1097 | */ | |
cdb56b60 | 1098 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1099 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1100 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1101 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1102 | } |
e114e473 CS |
1103 | |
1104 | return rc; | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1109 | * @old_inode: unused |
1110 | * @old_dentry: the old object | |
1111 | * @new_inode: unused | |
1112 | * @new_dentry: the new object | |
e114e473 CS |
1113 | * |
1114 | * Read and write access is required on both the old and | |
1115 | * new directories. | |
1116 | * | |
1117 | * Returns 0 if access is permitted, an error code otherwise | |
1118 | */ | |
1119 | static int smack_inode_rename(struct inode *old_inode, | |
1120 | struct dentry *old_dentry, | |
1121 | struct inode *new_inode, | |
1122 | struct dentry *new_dentry) | |
1123 | { | |
1124 | int rc; | |
21c7eae2 | 1125 | struct smack_known *isp; |
ecfcc53f EB |
1126 | struct smk_audit_info ad; |
1127 | ||
a269434d | 1128 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1129 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1130 | |
c6f493d6 | 1131 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1132 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1133 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1134 | |
8802565b | 1135 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1136 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1137 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1138 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1139 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1140 | } |
e114e473 CS |
1141 | return rc; |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * smack_inode_permission - Smack version of permission() | |
1146 | * @inode: the inode in question | |
1147 | * @mask: the access requested | |
e114e473 CS |
1148 | * |
1149 | * This is the important Smack hook. | |
1150 | * | |
a1a07f22 | 1151 | * Returns 0 if access is permitted, an error code otherwise |
e114e473 | 1152 | */ |
e74f71eb | 1153 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1154 | { |
1aea7808 | 1155 | struct superblock_smack *sbsp = smack_superblock(inode->i_sb); |
ecfcc53f | 1156 | struct smk_audit_info ad; |
e74f71eb | 1157 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1158 | int rc; |
d09ca739 EP |
1159 | |
1160 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1161 | /* |
1162 | * No permission to check. Existence test. Yup, it's there. | |
1163 | */ | |
1164 | if (mask == 0) | |
1165 | return 0; | |
8c9e80ed | 1166 | |
9f50eda2 SF |
1167 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1168 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1169 | return -EACCES; | |
1170 | } | |
1171 | ||
8c9e80ed | 1172 | /* May be droppable after audit */ |
e74f71eb | 1173 | if (no_block) |
8c9e80ed | 1174 | return -ECHILD; |
f48b7399 | 1175 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1176 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1177 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1178 | rc = smk_bu_inode(inode, mask, rc); | |
1179 | return rc; | |
e114e473 CS |
1180 | } |
1181 | ||
1182 | /** | |
1183 | * smack_inode_setattr - Smack check for setting attributes | |
1184 | * @dentry: the object | |
1185 | * @iattr: for the force flag | |
1186 | * | |
1187 | * Returns 0 if access is permitted, an error code otherwise | |
1188 | */ | |
1189 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1190 | { | |
ecfcc53f | 1191 | struct smk_audit_info ad; |
d166c802 CS |
1192 | int rc; |
1193 | ||
e114e473 CS |
1194 | /* |
1195 | * Need to allow for clearing the setuid bit. | |
1196 | */ | |
1197 | if (iattr->ia_valid & ATTR_FORCE) | |
1198 | return 0; | |
a269434d | 1199 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1200 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1201 | |
c6f493d6 DH |
1202 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1203 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1204 | return rc; |
e114e473 CS |
1205 | } |
1206 | ||
1207 | /** | |
1208 | * smack_inode_getattr - Smack check for getting attributes | |
a1a07f22 | 1209 | * @path: path to extract the info from |
e114e473 CS |
1210 | * |
1211 | * Returns 0 if access is permitted, an error code otherwise | |
1212 | */ | |
3f7036a0 | 1213 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1214 | { |
ecfcc53f | 1215 | struct smk_audit_info ad; |
c6f493d6 | 1216 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1217 | int rc; |
ecfcc53f | 1218 | |
f48b7399 | 1219 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1220 | smk_ad_setfield_u_fs_path(&ad, *path); |
1221 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1222 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1223 | return rc; |
e114e473 CS |
1224 | } |
1225 | ||
1226 | /** | |
1227 | * smack_inode_setxattr - Smack check for setting xattrs | |
39f60c1c | 1228 | * @idmap: idmap of the mount |
e114e473 CS |
1229 | * @dentry: the object |
1230 | * @name: name of the attribute | |
e95ef49b LP |
1231 | * @value: value of the attribute |
1232 | * @size: size of the value | |
e114e473 CS |
1233 | * @flags: unused |
1234 | * | |
1235 | * This protects the Smack attribute explicitly. | |
1236 | * | |
1237 | * Returns 0 if access is permitted, an error code otherwise | |
1238 | */ | |
39f60c1c | 1239 | static int smack_inode_setxattr(struct mnt_idmap *idmap, |
71bc356f | 1240 | struct dentry *dentry, const char *name, |
8f0cfa52 | 1241 | const void *value, size_t size, int flags) |
e114e473 | 1242 | { |
ecfcc53f | 1243 | struct smk_audit_info ad; |
19760ad0 CS |
1244 | struct smack_known *skp; |
1245 | int check_priv = 0; | |
1246 | int check_import = 0; | |
1247 | int check_star = 0; | |
bcdca225 | 1248 | int rc = 0; |
e114e473 | 1249 | |
19760ad0 CS |
1250 | /* |
1251 | * Check label validity here so import won't fail in post_setxattr | |
1252 | */ | |
bcdca225 CS |
1253 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1254 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1255 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1256 | check_priv = 1; | |
1257 | check_import = 1; | |
1258 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1259 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1260 | check_priv = 1; | |
1261 | check_import = 1; | |
1262 | check_star = 1; | |
5c6d1125 | 1263 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1264 | check_priv = 1; |
5c6d1125 JS |
1265 | if (size != TRANS_TRUE_SIZE || |
1266 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1267 | rc = -EINVAL; | |
bcdca225 CS |
1268 | } else |
1269 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1270 | ||
19760ad0 CS |
1271 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1272 | rc = -EPERM; | |
1273 | ||
1274 | if (rc == 0 && check_import) { | |
b862e561 | 1275 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1276 | if (IS_ERR(skp)) |
1277 | rc = PTR_ERR(skp); | |
1278 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1279 | (skp == &smack_known_star || skp == &smack_known_web))) |
1280 | rc = -EINVAL; | |
1281 | } | |
1282 | ||
a269434d | 1283 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1284 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1285 | ||
d166c802 | 1286 | if (rc == 0) { |
c6f493d6 DH |
1287 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1288 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1289 | } |
bcdca225 CS |
1290 | |
1291 | return rc; | |
e114e473 CS |
1292 | } |
1293 | ||
1294 | /** | |
1295 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1296 | * @dentry: object | |
1297 | * @name: attribute name | |
1298 | * @value: attribute value | |
1299 | * @size: attribute size | |
1300 | * @flags: unused | |
1301 | * | |
1302 | * Set the pointer in the inode blob to the entry found | |
1303 | * in the master label list. | |
1304 | */ | |
8f0cfa52 DH |
1305 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1306 | const void *value, size_t size, int flags) | |
e114e473 | 1307 | { |
2f823ff8 | 1308 | struct smack_known *skp; |
fb4021b6 | 1309 | struct inode_smack *isp = smack_inode(d_backing_inode(dentry)); |
676dac4b | 1310 | |
2f823ff8 CS |
1311 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1312 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1313 | return; | |
1314 | } | |
1315 | ||
676dac4b | 1316 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1317 | skp = smk_import_entry(value, size); |
e774ad68 | 1318 | if (!IS_ERR(skp)) |
21c7eae2 | 1319 | isp->smk_inode = skp; |
5c6d1125 | 1320 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1321 | skp = smk_import_entry(value, size); |
e774ad68 | 1322 | if (!IS_ERR(skp)) |
2f823ff8 | 1323 | isp->smk_task = skp; |
7898e1f8 | 1324 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1325 | skp = smk_import_entry(value, size); |
e774ad68 | 1326 | if (!IS_ERR(skp)) |
2f823ff8 | 1327 | isp->smk_mmap = skp; |
2f823ff8 | 1328 | } |
e114e473 CS |
1329 | |
1330 | return; | |
1331 | } | |
1332 | ||
ce8a4321 | 1333 | /** |
e114e473 CS |
1334 | * smack_inode_getxattr - Smack check on getxattr |
1335 | * @dentry: the object | |
1336 | * @name: unused | |
1337 | * | |
1338 | * Returns 0 if access is permitted, an error code otherwise | |
1339 | */ | |
8f0cfa52 | 1340 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1341 | { |
ecfcc53f | 1342 | struct smk_audit_info ad; |
d166c802 | 1343 | int rc; |
ecfcc53f | 1344 | |
a269434d | 1345 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1346 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1347 | ||
c6f493d6 DH |
1348 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1349 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1350 | return rc; |
e114e473 CS |
1351 | } |
1352 | ||
ce8a4321 | 1353 | /** |
e114e473 | 1354 | * smack_inode_removexattr - Smack check on removexattr |
39f60c1c | 1355 | * @idmap: idmap of the mount |
e114e473 CS |
1356 | * @dentry: the object |
1357 | * @name: name of the attribute | |
1358 | * | |
1359 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1360 | * | |
1361 | * Returns 0 if access is permitted, an error code otherwise | |
1362 | */ | |
39f60c1c | 1363 | static int smack_inode_removexattr(struct mnt_idmap *idmap, |
71bc356f | 1364 | struct dentry *dentry, const char *name) |
e114e473 | 1365 | { |
676dac4b | 1366 | struct inode_smack *isp; |
ecfcc53f | 1367 | struct smk_audit_info ad; |
bcdca225 | 1368 | int rc = 0; |
e114e473 | 1369 | |
bcdca225 CS |
1370 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1371 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1372 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1373 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1374 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1375 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1376 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1377 | rc = -EPERM; |
1378 | } else | |
39f60c1c | 1379 | rc = cap_inode_removexattr(idmap, dentry, name); |
bcdca225 | 1380 | |
f59bdfba CS |
1381 | if (rc != 0) |
1382 | return rc; | |
1383 | ||
a269434d | 1384 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1385 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1386 | |
c6f493d6 DH |
1387 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1388 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1389 | if (rc != 0) |
1390 | return rc; | |
1391 | ||
fb4021b6 | 1392 | isp = smack_inode(d_backing_inode(dentry)); |
f59bdfba CS |
1393 | /* |
1394 | * Don't do anything special for these. | |
1395 | * XATTR_NAME_SMACKIPIN | |
1396 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1397 | */ |
8012495e | 1398 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1399 | struct super_block *sbp = dentry->d_sb; |
1aea7808 | 1400 | struct superblock_smack *sbsp = smack_superblock(sbp); |
8012495e JB |
1401 | |
1402 | isp->smk_inode = sbsp->smk_default; | |
1403 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1404 | isp->smk_task = NULL; |
f59bdfba | 1405 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1406 | isp->smk_mmap = NULL; |
f59bdfba CS |
1407 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1408 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1409 | |
f59bdfba | 1410 | return 0; |
e114e473 CS |
1411 | } |
1412 | ||
44faac01 CB |
1413 | /** |
1414 | * smack_inode_set_acl - Smack check for setting posix acls | |
700b7940 | 1415 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1416 | * @dentry: the object |
1417 | * @acl_name: name of the posix acl | |
1418 | * @kacl: the posix acls | |
1419 | * | |
1420 | * Returns 0 if access is permitted, an error code otherwise | |
1421 | */ | |
700b7940 | 1422 | static int smack_inode_set_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1423 | struct dentry *dentry, const char *acl_name, |
1424 | struct posix_acl *kacl) | |
1425 | { | |
1426 | struct smk_audit_info ad; | |
1427 | int rc; | |
1428 | ||
1429 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1430 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1431 | ||
1432 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); | |
1433 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
1434 | return rc; | |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * smack_inode_get_acl - Smack check for getting posix acls | |
700b7940 | 1439 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1440 | * @dentry: the object |
1441 | * @acl_name: name of the posix acl | |
1442 | * | |
1443 | * Returns 0 if access is permitted, an error code otherwise | |
1444 | */ | |
700b7940 | 1445 | static int smack_inode_get_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1446 | struct dentry *dentry, const char *acl_name) |
1447 | { | |
1448 | struct smk_audit_info ad; | |
1449 | int rc; | |
1450 | ||
1451 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1452 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1453 | ||
1454 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); | |
1455 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
1456 | return rc; | |
1457 | } | |
1458 | ||
1459 | /** | |
1460 | * smack_inode_remove_acl - Smack check for getting posix acls | |
700b7940 | 1461 | * @idmap: idmap of the mnt this request came from |
44faac01 CB |
1462 | * @dentry: the object |
1463 | * @acl_name: name of the posix acl | |
1464 | * | |
1465 | * Returns 0 if access is permitted, an error code otherwise | |
1466 | */ | |
700b7940 | 1467 | static int smack_inode_remove_acl(struct mnt_idmap *idmap, |
44faac01 CB |
1468 | struct dentry *dentry, const char *acl_name) |
1469 | { | |
1470 | struct smk_audit_info ad; | |
1471 | int rc; | |
1472 | ||
1473 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); | |
1474 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
1475 | ||
1476 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); | |
1477 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
1478 | return rc; | |
1479 | } | |
1480 | ||
e114e473 CS |
1481 | /** |
1482 | * smack_inode_getsecurity - get smack xattrs | |
4609e1f1 | 1483 | * @idmap: idmap of the mount |
e114e473 CS |
1484 | * @inode: the object |
1485 | * @name: attribute name | |
1486 | * @buffer: where to put the result | |
57e7ba04 | 1487 | * @alloc: duplicate memory |
e114e473 CS |
1488 | * |
1489 | * Returns the size of the attribute or an error code | |
1490 | */ | |
4609e1f1 | 1491 | static int smack_inode_getsecurity(struct mnt_idmap *idmap, |
71bc356f CB |
1492 | struct inode *inode, const char *name, |
1493 | void **buffer, bool alloc) | |
e114e473 CS |
1494 | { |
1495 | struct socket_smack *ssp; | |
1496 | struct socket *sock; | |
1497 | struct super_block *sbp; | |
502a29b0 | 1498 | struct inode *ip = inode; |
21c7eae2 | 1499 | struct smack_known *isp; |
3a3d8fce RS |
1500 | struct inode_smack *ispp; |
1501 | size_t label_len; | |
1502 | char *label = NULL; | |
e114e473 | 1503 | |
3a3d8fce | 1504 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { |
e114e473 | 1505 | isp = smk_of_inode(inode); |
3a3d8fce RS |
1506 | } else if (strcmp(name, XATTR_SMACK_TRANSMUTE) == 0) { |
1507 | ispp = smack_inode(inode); | |
1508 | if (ispp->smk_flags & SMK_INODE_TRANSMUTE) | |
1509 | label = TRANS_TRUE; | |
1510 | else | |
1511 | label = ""; | |
1512 | } else { | |
57e7ba04 CS |
1513 | /* |
1514 | * The rest of the Smack xattrs are only on sockets. | |
1515 | */ | |
1516 | sbp = ip->i_sb; | |
1517 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1518 | return -EOPNOTSUPP; | |
e114e473 | 1519 | |
57e7ba04 CS |
1520 | sock = SOCKET_I(ip); |
1521 | if (sock == NULL || sock->sk == NULL) | |
1522 | return -EOPNOTSUPP; | |
e114e473 | 1523 | |
57e7ba04 | 1524 | ssp = sock->sk->sk_security; |
e114e473 | 1525 | |
57e7ba04 CS |
1526 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1527 | isp = ssp->smk_in; | |
1528 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1529 | isp = ssp->smk_out; | |
1530 | else | |
1531 | return -EOPNOTSUPP; | |
1532 | } | |
e114e473 | 1533 | |
3a3d8fce RS |
1534 | if (!label) |
1535 | label = isp->smk_known; | |
1536 | ||
1537 | label_len = strlen(label); | |
1538 | ||
57e7ba04 | 1539 | if (alloc) { |
3a3d8fce | 1540 | *buffer = kstrdup(label, GFP_KERNEL); |
57e7ba04 CS |
1541 | if (*buffer == NULL) |
1542 | return -ENOMEM; | |
e114e473 CS |
1543 | } |
1544 | ||
3a3d8fce | 1545 | return label_len; |
e114e473 CS |
1546 | } |
1547 | ||
1548 | ||
1549 | /** | |
1550 | * smack_inode_listsecurity - list the Smack attributes | |
1551 | * @inode: the object | |
1552 | * @buffer: where they go | |
1553 | * @buffer_size: size of buffer | |
e114e473 CS |
1554 | */ |
1555 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1556 | size_t buffer_size) | |
1557 | { | |
fd5c9d23 | 1558 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1559 | |
fd5c9d23 | 1560 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1561 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1562 | |
1563 | return len; | |
e114e473 CS |
1564 | } |
1565 | ||
d20bdda6 AD |
1566 | /** |
1567 | * smack_inode_getsecid - Extract inode's security id | |
1568 | * @inode: inode to extract the info from | |
1569 | * @secid: where result will be saved | |
1570 | */ | |
d6335d77 | 1571 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1572 | { |
0f8983cf | 1573 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1574 | |
0f8983cf | 1575 | *secid = skp->smk_secid; |
d20bdda6 AD |
1576 | } |
1577 | ||
e114e473 CS |
1578 | /* |
1579 | * File Hooks | |
1580 | */ | |
1581 | ||
491a0b08 CS |
1582 | /* |
1583 | * There is no smack_file_permission hook | |
e114e473 CS |
1584 | * |
1585 | * Should access checks be done on each read or write? | |
1586 | * UNICOS and SELinux say yes. | |
1587 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1588 | * | |
1589 | * I'll say no for now. Smack does not do the frequent | |
1590 | * label changing that SELinux does. | |
1591 | */ | |
e114e473 CS |
1592 | |
1593 | /** | |
1594 | * smack_file_alloc_security - assign a file security blob | |
1595 | * @file: the object | |
1596 | * | |
1597 | * The security blob for a file is a pointer to the master | |
1598 | * label list, so no allocation is done. | |
1599 | * | |
5e7270a6 CS |
1600 | * f_security is the owner security information. It |
1601 | * isn't used on file access checks, it's for send_sigio. | |
1602 | * | |
e114e473 CS |
1603 | * Returns 0 |
1604 | */ | |
1605 | static int smack_file_alloc_security(struct file *file) | |
1606 | { | |
f28952ac | 1607 | struct smack_known **blob = smack_file(file); |
2f823ff8 | 1608 | |
f28952ac | 1609 | *blob = smk_of_current(); |
e114e473 CS |
1610 | return 0; |
1611 | } | |
1612 | ||
e114e473 CS |
1613 | /** |
1614 | * smack_file_ioctl - Smack check on ioctls | |
1615 | * @file: the object | |
1616 | * @cmd: what to do | |
1617 | * @arg: unused | |
1618 | * | |
1619 | * Relies heavily on the correct use of the ioctl command conventions. | |
1620 | * | |
1621 | * Returns 0 if allowed, error code otherwise | |
1622 | */ | |
1623 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1624 | unsigned long arg) | |
1625 | { | |
1626 | int rc = 0; | |
ecfcc53f | 1627 | struct smk_audit_info ad; |
5e7270a6 | 1628 | struct inode *inode = file_inode(file); |
ecfcc53f | 1629 | |
83a1e53f SWK |
1630 | if (unlikely(IS_PRIVATE(inode))) |
1631 | return 0; | |
1632 | ||
f48b7399 | 1633 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1634 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1635 | |
d166c802 | 1636 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1637 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1638 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1639 | } | |
e114e473 | 1640 | |
d166c802 | 1641 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1642 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1643 | rc = smk_bu_file(file, MAY_READ, rc); |
1644 | } | |
e114e473 CS |
1645 | |
1646 | return rc; | |
1647 | } | |
1648 | ||
1649 | /** | |
1650 | * smack_file_lock - Smack check on file locking | |
1651 | * @file: the object | |
251a2a95 | 1652 | * @cmd: unused |
e114e473 | 1653 | * |
c0ab6e56 | 1654 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1655 | */ |
1656 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1657 | { | |
ecfcc53f | 1658 | struct smk_audit_info ad; |
d166c802 | 1659 | int rc; |
5e7270a6 | 1660 | struct inode *inode = file_inode(file); |
ecfcc53f | 1661 | |
83a1e53f SWK |
1662 | if (unlikely(IS_PRIVATE(inode))) |
1663 | return 0; | |
1664 | ||
92f42509 EP |
1665 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1666 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1667 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1668 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1669 | return rc; | |
e114e473 CS |
1670 | } |
1671 | ||
1672 | /** | |
1673 | * smack_file_fcntl - Smack check on fcntl | |
1674 | * @file: the object | |
1675 | * @cmd: what action to check | |
1676 | * @arg: unused | |
1677 | * | |
531f1d45 CS |
1678 | * Generally these operations are harmless. |
1679 | * File locking operations present an obvious mechanism | |
1680 | * for passing information, so they require write access. | |
1681 | * | |
e114e473 CS |
1682 | * Returns 0 if current has access, error code otherwise |
1683 | */ | |
1684 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1685 | unsigned long arg) | |
1686 | { | |
ecfcc53f | 1687 | struct smk_audit_info ad; |
531f1d45 | 1688 | int rc = 0; |
5e7270a6 | 1689 | struct inode *inode = file_inode(file); |
ecfcc53f | 1690 | |
83a1e53f SWK |
1691 | if (unlikely(IS_PRIVATE(inode))) |
1692 | return 0; | |
1693 | ||
e114e473 | 1694 | switch (cmd) { |
e114e473 | 1695 | case F_GETLK: |
c0ab6e56 | 1696 | break; |
e114e473 CS |
1697 | case F_SETLK: |
1698 | case F_SETLKW: | |
c0ab6e56 CS |
1699 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1700 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1701 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1702 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1703 | break; |
e114e473 CS |
1704 | case F_SETOWN: |
1705 | case F_SETSIG: | |
531f1d45 CS |
1706 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1707 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1708 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1709 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1710 | break; |
1711 | default: | |
531f1d45 | 1712 | break; |
e114e473 CS |
1713 | } |
1714 | ||
1715 | return rc; | |
1716 | } | |
1717 | ||
7898e1f8 | 1718 | /** |
b57d0209 CS |
1719 | * smack_mmap_file - Check permissions for a mmap operation. |
1720 | * @file: contains the file structure for file to map (may be NULL). | |
1721 | * @reqprot: contains the protection requested by the application. | |
1722 | * @prot: contains the protection that will be applied by the kernel. | |
1723 | * @flags: contains the operational flags. | |
1724 | * | |
1725 | * The @file may be NULL, e.g. if mapping anonymous memory. | |
1726 | * | |
7898e1f8 CS |
1727 | * Return 0 if permission is granted. |
1728 | */ | |
e5467859 | 1729 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1730 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1731 | unsigned long flags) |
7898e1f8 | 1732 | { |
272cd7a8 | 1733 | struct smack_known *skp; |
2f823ff8 | 1734 | struct smack_known *mkp; |
7898e1f8 CS |
1735 | struct smack_rule *srp; |
1736 | struct task_smack *tsp; | |
21c7eae2 | 1737 | struct smack_known *okp; |
7898e1f8 | 1738 | struct inode_smack *isp; |
809c02e0 | 1739 | struct superblock_smack *sbsp; |
0e0a070d CS |
1740 | int may; |
1741 | int mmay; | |
1742 | int tmay; | |
7898e1f8 CS |
1743 | int rc; |
1744 | ||
496ad9aa | 1745 | if (file == NULL) |
7898e1f8 CS |
1746 | return 0; |
1747 | ||
83a1e53f SWK |
1748 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1749 | return 0; | |
1750 | ||
fb4021b6 | 1751 | isp = smack_inode(file_inode(file)); |
7898e1f8 CS |
1752 | if (isp->smk_mmap == NULL) |
1753 | return 0; | |
1aea7808 | 1754 | sbsp = smack_superblock(file_inode(file)->i_sb); |
809c02e0 SF |
1755 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && |
1756 | isp->smk_mmap != sbsp->smk_root) | |
1757 | return -EACCES; | |
2f823ff8 | 1758 | mkp = isp->smk_mmap; |
7898e1f8 | 1759 | |
b17103a8 | 1760 | tsp = smack_cred(current_cred()); |
2f823ff8 | 1761 | skp = smk_of_current(); |
7898e1f8 CS |
1762 | rc = 0; |
1763 | ||
1764 | rcu_read_lock(); | |
1765 | /* | |
1766 | * For each Smack rule associated with the subject | |
1767 | * label verify that the SMACK64MMAP also has access | |
1768 | * to that rule's object label. | |
7898e1f8 | 1769 | */ |
272cd7a8 | 1770 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1771 | okp = srp->smk_object; |
7898e1f8 CS |
1772 | /* |
1773 | * Matching labels always allows access. | |
1774 | */ | |
21c7eae2 | 1775 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1776 | continue; |
0e0a070d CS |
1777 | /* |
1778 | * If there is a matching local rule take | |
1779 | * that into account as well. | |
1780 | */ | |
21c7eae2 LP |
1781 | may = smk_access_entry(srp->smk_subject->smk_known, |
1782 | okp->smk_known, | |
1783 | &tsp->smk_rules); | |
0e0a070d CS |
1784 | if (may == -ENOENT) |
1785 | may = srp->smk_access; | |
1786 | else | |
1787 | may &= srp->smk_access; | |
1788 | /* | |
1789 | * If may is zero the SMACK64MMAP subject can't | |
1790 | * possibly have less access. | |
1791 | */ | |
1792 | if (may == 0) | |
1793 | continue; | |
1794 | ||
1795 | /* | |
1796 | * Fetch the global list entry. | |
1797 | * If there isn't one a SMACK64MMAP subject | |
1798 | * can't have as much access as current. | |
1799 | */ | |
21c7eae2 LP |
1800 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1801 | &mkp->smk_rules); | |
0e0a070d CS |
1802 | if (mmay == -ENOENT) { |
1803 | rc = -EACCES; | |
1804 | break; | |
1805 | } | |
1806 | /* | |
1807 | * If there is a local entry it modifies the | |
1808 | * potential access, too. | |
1809 | */ | |
21c7eae2 LP |
1810 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1811 | &tsp->smk_rules); | |
0e0a070d CS |
1812 | if (tmay != -ENOENT) |
1813 | mmay &= tmay; | |
7898e1f8 | 1814 | |
0e0a070d CS |
1815 | /* |
1816 | * If there is any access available to current that is | |
1817 | * not available to a SMACK64MMAP subject | |
1818 | * deny access. | |
1819 | */ | |
75a25637 | 1820 | if ((may | mmay) != mmay) { |
0e0a070d | 1821 | rc = -EACCES; |
7898e1f8 | 1822 | break; |
0e0a070d | 1823 | } |
7898e1f8 CS |
1824 | } |
1825 | ||
1826 | rcu_read_unlock(); | |
1827 | ||
1828 | return rc; | |
1829 | } | |
1830 | ||
e114e473 CS |
1831 | /** |
1832 | * smack_file_set_fowner - set the file security blob value | |
1833 | * @file: object in question | |
1834 | * | |
e114e473 | 1835 | */ |
e0b93edd | 1836 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1837 | { |
f28952ac CS |
1838 | struct smack_known **blob = smack_file(file); |
1839 | ||
1840 | *blob = smk_of_current(); | |
e114e473 CS |
1841 | } |
1842 | ||
1843 | /** | |
1844 | * smack_file_send_sigiotask - Smack on sigio | |
1845 | * @tsk: The target task | |
1846 | * @fown: the object the signal come from | |
1847 | * @signum: unused | |
1848 | * | |
1849 | * Allow a privileged task to get signals even if it shouldn't | |
1850 | * | |
1851 | * Returns 0 if a subject with the object's smack could | |
1852 | * write to the task, an error code otherwise. | |
1853 | */ | |
1854 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1855 | struct fown_struct *fown, int signum) | |
1856 | { | |
f28952ac | 1857 | struct smack_known **blob; |
2f823ff8 | 1858 | struct smack_known *skp; |
b17103a8 | 1859 | struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred)); |
dcb569cf | 1860 | const struct cred *tcred; |
e114e473 CS |
1861 | struct file *file; |
1862 | int rc; | |
ecfcc53f | 1863 | struct smk_audit_info ad; |
e114e473 CS |
1864 | |
1865 | /* | |
1866 | * struct fown_struct is never outside the context of a struct file | |
1867 | */ | |
1868 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1869 | |
ecfcc53f | 1870 | /* we don't log here as rc can be overriden */ |
f28952ac CS |
1871 | blob = smack_file(file); |
1872 | skp = *blob; | |
c60b9066 CS |
1873 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1874 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1875 | |
1876 | rcu_read_lock(); | |
1877 | tcred = __task_cred(tsk); | |
1878 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1879 | rc = 0; |
dcb569cf | 1880 | rcu_read_unlock(); |
ecfcc53f EB |
1881 | |
1882 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1883 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1884 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1885 | return rc; |
1886 | } | |
1887 | ||
1888 | /** | |
1889 | * smack_file_receive - Smack file receive check | |
1890 | * @file: the object | |
1891 | * | |
1892 | * Returns 0 if current has access, error code otherwise | |
1893 | */ | |
1894 | static int smack_file_receive(struct file *file) | |
1895 | { | |
d166c802 | 1896 | int rc; |
e114e473 | 1897 | int may = 0; |
ecfcc53f | 1898 | struct smk_audit_info ad; |
5e7270a6 | 1899 | struct inode *inode = file_inode(file); |
79be0935 CS |
1900 | struct socket *sock; |
1901 | struct task_smack *tsp; | |
1902 | struct socket_smack *ssp; | |
e114e473 | 1903 | |
9777582e SWK |
1904 | if (unlikely(IS_PRIVATE(inode))) |
1905 | return 0; | |
1906 | ||
4482a44f | 1907 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1908 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1909 | |
51d59af2 | 1910 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1911 | sock = SOCKET_I(inode); |
1912 | ssp = sock->sk->sk_security; | |
b17103a8 | 1913 | tsp = smack_cred(current_cred()); |
79be0935 CS |
1914 | /* |
1915 | * If the receiving process can't write to the | |
1916 | * passed socket or if the passed socket can't | |
1917 | * write to the receiving process don't accept | |
1918 | * the passed socket. | |
1919 | */ | |
1920 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1921 | rc = smk_bu_file(file, may, rc); | |
1922 | if (rc < 0) | |
1923 | return rc; | |
1924 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1925 | rc = smk_bu_file(file, may, rc); | |
1926 | return rc; | |
1927 | } | |
e114e473 CS |
1928 | /* |
1929 | * This code relies on bitmasks. | |
1930 | */ | |
1931 | if (file->f_mode & FMODE_READ) | |
1932 | may = MAY_READ; | |
1933 | if (file->f_mode & FMODE_WRITE) | |
1934 | may |= MAY_WRITE; | |
1935 | ||
5e7270a6 | 1936 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1937 | rc = smk_bu_file(file, may, rc); |
1938 | return rc; | |
e114e473 CS |
1939 | } |
1940 | ||
531f1d45 | 1941 | /** |
83d49856 | 1942 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1943 | * @file: the object |
531f1d45 CS |
1944 | * |
1945 | * Set the security blob in the file structure. | |
a6834c0b CS |
1946 | * Allow the open only if the task has read access. There are |
1947 | * many read operations (e.g. fstat) that you can do with an | |
1948 | * fd even if you have the file open write-only. | |
531f1d45 | 1949 | * |
a1a07f22 | 1950 | * Returns 0 if current has access, error code otherwise |
531f1d45 | 1951 | */ |
94817692 | 1952 | static int smack_file_open(struct file *file) |
531f1d45 | 1953 | { |
b17103a8 | 1954 | struct task_smack *tsp = smack_cred(file->f_cred); |
5e7270a6 | 1955 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1956 | struct smk_audit_info ad; |
1957 | int rc; | |
531f1d45 | 1958 | |
a6834c0b CS |
1959 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1960 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1961 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1962 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1963 | |
1964 | return rc; | |
531f1d45 CS |
1965 | } |
1966 | ||
e114e473 CS |
1967 | /* |
1968 | * Task hooks | |
1969 | */ | |
1970 | ||
ee18d64c DH |
1971 | /** |
1972 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
a1a07f22 | 1973 | * @cred: the new credentials |
ee18d64c DH |
1974 | * @gfp: the atomicity of any memory allocations |
1975 | * | |
1976 | * Prepare a blank set of credentials for modification. This must allocate all | |
1977 | * the memory the LSM module might require such that cred_transfer() can | |
1978 | * complete without error. | |
1979 | */ | |
1980 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1981 | { | |
bbd3662a | 1982 | init_task_smack(smack_cred(cred), NULL, NULL); |
ee18d64c DH |
1983 | return 0; |
1984 | } | |
1985 | ||
1986 | ||
e114e473 | 1987 | /** |
f1752eec DH |
1988 | * smack_cred_free - "free" task-level security credentials |
1989 | * @cred: the credentials in question | |
e114e473 | 1990 | * |
e114e473 | 1991 | */ |
f1752eec | 1992 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1993 | { |
b17103a8 | 1994 | struct task_smack *tsp = smack_cred(cred); |
7898e1f8 CS |
1995 | struct smack_rule *rp; |
1996 | struct list_head *l; | |
1997 | struct list_head *n; | |
1998 | ||
38416e53 ZJ |
1999 | smk_destroy_label_list(&tsp->smk_relabel); |
2000 | ||
7898e1f8 CS |
2001 | list_for_each_safe(l, n, &tsp->smk_rules) { |
2002 | rp = list_entry(l, struct smack_rule, list); | |
2003 | list_del(&rp->list); | |
4e328b08 | 2004 | kmem_cache_free(smack_rule_cache, rp); |
7898e1f8 | 2005 | } |
e114e473 CS |
2006 | } |
2007 | ||
d84f4f99 DH |
2008 | /** |
2009 | * smack_cred_prepare - prepare new set of credentials for modification | |
2010 | * @new: the new credentials | |
2011 | * @old: the original credentials | |
2012 | * @gfp: the atomicity of any memory allocations | |
2013 | * | |
2014 | * Prepare a new set of credentials for modification. | |
2015 | */ | |
2016 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2017 | gfp_t gfp) | |
2018 | { | |
b17103a8 | 2019 | struct task_smack *old_tsp = smack_cred(old); |
bbd3662a | 2020 | struct task_smack *new_tsp = smack_cred(new); |
7898e1f8 | 2021 | int rc; |
676dac4b | 2022 | |
bbd3662a | 2023 | init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task); |
b437aba8 | 2024 | |
7898e1f8 CS |
2025 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2026 | if (rc != 0) | |
2027 | return rc; | |
2028 | ||
38416e53 ZJ |
2029 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2030 | gfp); | |
bbd3662a | 2031 | return rc; |
d84f4f99 DH |
2032 | } |
2033 | ||
ee18d64c DH |
2034 | /** |
2035 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2036 | * @new: the new credentials | |
2037 | * @old: the original credentials | |
2038 | * | |
2039 | * Fill in a set of blank credentials from another set of credentials. | |
2040 | */ | |
2041 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2042 | { | |
b17103a8 CS |
2043 | struct task_smack *old_tsp = smack_cred(old); |
2044 | struct task_smack *new_tsp = smack_cred(new); | |
676dac4b CS |
2045 | |
2046 | new_tsp->smk_task = old_tsp->smk_task; | |
2047 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2048 | mutex_init(&new_tsp->smk_rules_lock); |
2049 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2050 | ||
7898e1f8 | 2051 | /* cbs copy rule list */ |
ee18d64c DH |
2052 | } |
2053 | ||
3ec30113 MG |
2054 | /** |
2055 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
a1a07f22 | 2056 | * @cred: the object creds |
3ec30113 MG |
2057 | * @secid: where to put the result |
2058 | * | |
2059 | * Sets the secid to contain a u32 version of the smack label. | |
2060 | */ | |
b17103a8 | 2061 | static void smack_cred_getsecid(const struct cred *cred, u32 *secid) |
3ec30113 MG |
2062 | { |
2063 | struct smack_known *skp; | |
2064 | ||
2065 | rcu_read_lock(); | |
b17103a8 | 2066 | skp = smk_of_task(smack_cred(cred)); |
3ec30113 MG |
2067 | *secid = skp->smk_secid; |
2068 | rcu_read_unlock(); | |
2069 | } | |
2070 | ||
3a3b7ce9 DH |
2071 | /** |
2072 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2073 | * @new: points to the set of credentials to be modified. |
2074 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2075 | * |
2076 | * Set the security data for a kernel service. | |
2077 | */ | |
2078 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2079 | { | |
b17103a8 | 2080 | struct task_smack *new_tsp = smack_cred(new); |
3a3b7ce9 | 2081 | |
152f91d4 | 2082 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2083 | return 0; |
2084 | } | |
2085 | ||
2086 | /** | |
2087 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2088 | * @new: points to the set of credentials to be modified |
2089 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2090 | * |
2091 | * Set the file creation context in a set of credentials to the same | |
2092 | * as the objective context of the specified inode | |
2093 | */ | |
2094 | static int smack_kernel_create_files_as(struct cred *new, | |
2095 | struct inode *inode) | |
2096 | { | |
fb4021b6 | 2097 | struct inode_smack *isp = smack_inode(inode); |
b17103a8 | 2098 | struct task_smack *tsp = smack_cred(new); |
3a3b7ce9 | 2099 | |
21c7eae2 | 2100 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2101 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2102 | return 0; |
2103 | } | |
2104 | ||
ecfcc53f EB |
2105 | /** |
2106 | * smk_curacc_on_task - helper to log task related access | |
2107 | * @p: the task object | |
531f1d45 CS |
2108 | * @access: the access requested |
2109 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2110 | * |
2111 | * Return 0 if access is permitted | |
2112 | */ | |
531f1d45 CS |
2113 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2114 | const char *caller) | |
ecfcc53f EB |
2115 | { |
2116 | struct smk_audit_info ad; | |
a3727a8b | 2117 | struct smack_known *skp = smk_of_task_struct_obj(p); |
d166c802 | 2118 | int rc; |
ecfcc53f | 2119 | |
531f1d45 | 2120 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2121 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2122 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2123 | rc = smk_bu_task(p, access, rc); |
2124 | return rc; | |
ecfcc53f EB |
2125 | } |
2126 | ||
e114e473 CS |
2127 | /** |
2128 | * smack_task_setpgid - Smack check on setting pgid | |
2129 | * @p: the task object | |
2130 | * @pgid: unused | |
2131 | * | |
2132 | * Return 0 if write access is permitted | |
2133 | */ | |
2134 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2135 | { | |
531f1d45 | 2136 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2137 | } |
2138 | ||
2139 | /** | |
2140 | * smack_task_getpgid - Smack access check for getpgid | |
2141 | * @p: the object task | |
2142 | * | |
2143 | * Returns 0 if current can read the object task, error code otherwise | |
2144 | */ | |
2145 | static int smack_task_getpgid(struct task_struct *p) | |
2146 | { | |
531f1d45 | 2147 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2148 | } |
2149 | ||
2150 | /** | |
2151 | * smack_task_getsid - Smack access check for getsid | |
2152 | * @p: the object task | |
2153 | * | |
2154 | * Returns 0 if current can read the object task, error code otherwise | |
2155 | */ | |
2156 | static int smack_task_getsid(struct task_struct *p) | |
2157 | { | |
531f1d45 | 2158 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2159 | } |
2160 | ||
2161 | /** | |
6326948f | 2162 | * smack_current_getsecid_subj - get the subjective secid of the current task |
e114e473 CS |
2163 | * @secid: where to put the result |
2164 | * | |
1fb057dc PM |
2165 | * Sets the secid to contain a u32 version of the task's subjective smack label. |
2166 | */ | |
6326948f | 2167 | static void smack_current_getsecid_subj(u32 *secid) |
1fb057dc | 2168 | { |
6326948f | 2169 | struct smack_known *skp = smk_of_current(); |
1fb057dc PM |
2170 | |
2171 | *secid = skp->smk_secid; | |
2172 | } | |
2173 | ||
2174 | /** | |
2175 | * smack_task_getsecid_obj - get the objective secid of the task | |
2176 | * @p: the task | |
2177 | * @secid: where to put the result | |
2178 | * | |
2179 | * Sets the secid to contain a u32 version of the task's objective smack label. | |
e114e473 | 2180 | */ |
1fb057dc | 2181 | static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid) |
e114e473 | 2182 | { |
1fb057dc | 2183 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 CS |
2184 | |
2185 | *secid = skp->smk_secid; | |
e114e473 CS |
2186 | } |
2187 | ||
2188 | /** | |
2189 | * smack_task_setnice - Smack check on setting nice | |
2190 | * @p: the task object | |
2191 | * @nice: unused | |
2192 | * | |
2193 | * Return 0 if write access is permitted | |
2194 | */ | |
2195 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2196 | { | |
b1d9e6b0 | 2197 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2198 | } |
2199 | ||
2200 | /** | |
2201 | * smack_task_setioprio - Smack check on setting ioprio | |
2202 | * @p: the task object | |
2203 | * @ioprio: unused | |
2204 | * | |
2205 | * Return 0 if write access is permitted | |
2206 | */ | |
2207 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2208 | { | |
b1d9e6b0 | 2209 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2210 | } |
2211 | ||
2212 | /** | |
2213 | * smack_task_getioprio - Smack check on reading ioprio | |
2214 | * @p: the task object | |
2215 | * | |
2216 | * Return 0 if read access is permitted | |
2217 | */ | |
2218 | static int smack_task_getioprio(struct task_struct *p) | |
2219 | { | |
531f1d45 | 2220 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2221 | } |
2222 | ||
2223 | /** | |
2224 | * smack_task_setscheduler - Smack check on setting scheduler | |
2225 | * @p: the task object | |
e114e473 CS |
2226 | * |
2227 | * Return 0 if read access is permitted | |
2228 | */ | |
b0ae1981 | 2229 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2230 | { |
b1d9e6b0 | 2231 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2232 | } |
2233 | ||
2234 | /** | |
2235 | * smack_task_getscheduler - Smack check on reading scheduler | |
2236 | * @p: the task object | |
2237 | * | |
2238 | * Return 0 if read access is permitted | |
2239 | */ | |
2240 | static int smack_task_getscheduler(struct task_struct *p) | |
2241 | { | |
531f1d45 | 2242 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2243 | } |
2244 | ||
2245 | /** | |
2246 | * smack_task_movememory - Smack check on moving memory | |
2247 | * @p: the task object | |
2248 | * | |
2249 | * Return 0 if write access is permitted | |
2250 | */ | |
2251 | static int smack_task_movememory(struct task_struct *p) | |
2252 | { | |
531f1d45 | 2253 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2254 | } |
2255 | ||
2256 | /** | |
2257 | * smack_task_kill - Smack check on signal delivery | |
2258 | * @p: the task object | |
2259 | * @info: unused | |
2260 | * @sig: unused | |
6b4f3d01 | 2261 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2262 | * |
2263 | * Return 0 if write access is permitted | |
2264 | * | |
e114e473 | 2265 | */ |
ae7795bc | 2266 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2267 | int sig, const struct cred *cred) |
e114e473 | 2268 | { |
ecfcc53f | 2269 | struct smk_audit_info ad; |
2f823ff8 | 2270 | struct smack_known *skp; |
1fb057dc | 2271 | struct smack_known *tkp = smk_of_task_struct_obj(p); |
d166c802 | 2272 | int rc; |
ecfcc53f | 2273 | |
18d872f7 RK |
2274 | if (!sig) |
2275 | return 0; /* null signal; existence test */ | |
2276 | ||
ecfcc53f EB |
2277 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2278 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2279 | /* |
2280 | * Sending a signal requires that the sender | |
2281 | * can write the receiver. | |
2282 | */ | |
6b4f3d01 | 2283 | if (cred == NULL) { |
c60b9066 CS |
2284 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2285 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2286 | return rc; |
2287 | } | |
e114e473 | 2288 | /* |
6b4f3d01 | 2289 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2290 | * specific behavior. This is not clean. For one thing |
2291 | * we can't take privilege into account. | |
2292 | */ | |
b17103a8 | 2293 | skp = smk_of_task(smack_cred(cred)); |
c60b9066 CS |
2294 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2295 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2296 | return rc; |
e114e473 CS |
2297 | } |
2298 | ||
e114e473 CS |
2299 | /** |
2300 | * smack_task_to_inode - copy task smack into the inode blob | |
2301 | * @p: task to copy from | |
251a2a95 | 2302 | * @inode: inode to copy to |
e114e473 CS |
2303 | * |
2304 | * Sets the smack pointer in the inode security blob | |
2305 | */ | |
2306 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2307 | { | |
fb4021b6 | 2308 | struct inode_smack *isp = smack_inode(inode); |
1fb057dc | 2309 | struct smack_known *skp = smk_of_task_struct_obj(p); |
2f823ff8 | 2310 | |
21c7eae2 | 2311 | isp->smk_inode = skp; |
7b4e8843 | 2312 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2313 | } |
2314 | ||
2315 | /* | |
2316 | * Socket hooks. | |
2317 | */ | |
2318 | ||
2319 | /** | |
2320 | * smack_sk_alloc_security - Allocate a socket blob | |
2321 | * @sk: the socket | |
2322 | * @family: unused | |
251a2a95 | 2323 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2324 | * |
2325 | * Assign Smack pointers to current | |
2326 | * | |
2327 | * Returns 0 on success, -ENOMEM is there's no memory | |
2328 | */ | |
2329 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2330 | { | |
2f823ff8 | 2331 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2332 | struct socket_smack *ssp; |
2333 | ||
2334 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2335 | if (ssp == NULL) | |
2336 | return -ENOMEM; | |
2337 | ||
08382c9f | 2338 | /* |
2339 | * Sockets created by kernel threads receive web label. | |
2340 | */ | |
2341 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2342 | ssp->smk_in = &smack_known_web; | |
2343 | ssp->smk_out = &smack_known_web; | |
2344 | } else { | |
2345 | ssp->smk_in = skp; | |
2346 | ssp->smk_out = skp; | |
2347 | } | |
272cd7a8 | 2348 | ssp->smk_packet = NULL; |
e114e473 CS |
2349 | |
2350 | sk->sk_security = ssp; | |
2351 | ||
2352 | return 0; | |
2353 | } | |
2354 | ||
2355 | /** | |
2356 | * smack_sk_free_security - Free a socket blob | |
2357 | * @sk: the socket | |
2358 | * | |
2359 | * Clears the blob pointer | |
2360 | */ | |
2361 | static void smack_sk_free_security(struct sock *sk) | |
2362 | { | |
0c96d1f5 VG |
2363 | #ifdef SMACK_IPV6_PORT_LABELING |
2364 | struct smk_port_label *spp; | |
2365 | ||
2366 | if (sk->sk_family == PF_INET6) { | |
2367 | rcu_read_lock(); | |
2368 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2369 | if (spp->smk_sock != sk) | |
2370 | continue; | |
2371 | spp->smk_can_reuse = 1; | |
2372 | break; | |
2373 | } | |
2374 | rcu_read_unlock(); | |
2375 | } | |
2376 | #endif | |
e114e473 CS |
2377 | kfree(sk->sk_security); |
2378 | } | |
2379 | ||
4ca165fc LM |
2380 | /** |
2381 | * smack_sk_clone_security - Copy security context | |
2382 | * @sk: the old socket | |
2383 | * @newsk: the new socket | |
2384 | * | |
2385 | * Copy the security context of the old socket pointer to the cloned | |
2386 | */ | |
2387 | static void smack_sk_clone_security(const struct sock *sk, struct sock *newsk) | |
2388 | { | |
2389 | struct socket_smack *ssp_old = sk->sk_security; | |
2390 | struct socket_smack *ssp_new = newsk->sk_security; | |
2391 | ||
2392 | *ssp_new = *ssp_old; | |
2393 | } | |
2394 | ||
07feee8f | 2395 | /** |
21abb1ec | 2396 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2397 | * @sip: the object end |
2398 | * | |
2399 | * looks for host based access restrictions | |
2400 | * | |
2401 | * This version will only be appropriate for really small sets of single label | |
2402 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2403 | * taken before calling this function. | |
2404 | * | |
2405 | * Returns the label of the far end or NULL if it's not special. | |
2406 | */ | |
21abb1ec | 2407 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2408 | { |
21abb1ec | 2409 | struct smk_net4addr *snp; |
07feee8f PM |
2410 | struct in_addr *siap = &sip->sin_addr; |
2411 | ||
2412 | if (siap->s_addr == 0) | |
2413 | return NULL; | |
2414 | ||
21abb1ec CS |
2415 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2416 | /* | |
2417 | * we break after finding the first match because | |
2418 | * the list is sorted from longest to shortest mask | |
2419 | * so we have found the most specific match | |
2420 | */ | |
2421 | if (snp->smk_host.s_addr == | |
2422 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2423 | return snp->smk_label; | |
2424 | ||
2425 | return NULL; | |
2426 | } | |
2427 | ||
21abb1ec CS |
2428 | /* |
2429 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2430 | * @sip: the address | |
2431 | * | |
2432 | * Returns boolean true if this is the localhost address | |
2433 | */ | |
2434 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2435 | { | |
2436 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2437 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2438 | ||
2439 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2440 | ntohs(be16p[7]) == 1) | |
2441 | return true; | |
2442 | return false; | |
2443 | } | |
2444 | ||
2445 | /** | |
2446 | * smack_ipv6host_label - check host based restrictions | |
2447 | * @sip: the object end | |
2448 | * | |
2449 | * looks for host based access restrictions | |
2450 | * | |
2451 | * This version will only be appropriate for really small sets of single label | |
2452 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2453 | * taken before calling this function. | |
2454 | * | |
2455 | * Returns the label of the far end or NULL if it's not special. | |
2456 | */ | |
2457 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2458 | { | |
2459 | struct smk_net6addr *snp; | |
2460 | struct in6_addr *sap = &sip->sin6_addr; | |
2461 | int i; | |
2462 | int found = 0; | |
2463 | ||
2464 | /* | |
2465 | * It's local. Don't look for a host label. | |
2466 | */ | |
2467 | if (smk_ipv6_localhost(sip)) | |
2468 | return NULL; | |
2469 | ||
2470 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2471 | /* |
2472 | * If the label is NULL the entry has | |
2473 | * been renounced. Ignore it. | |
2474 | */ | |
2475 | if (snp->smk_label == NULL) | |
2476 | continue; | |
07feee8f PM |
2477 | /* |
2478 | * we break after finding the first match because | |
2479 | * the list is sorted from longest to shortest mask | |
2480 | * so we have found the most specific match | |
2481 | */ | |
21abb1ec | 2482 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2483 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2484 | snp->smk_host.s6_addr16[i]) { | |
2485 | found = 0; | |
2486 | break; | |
2487 | } | |
4303154e | 2488 | } |
21abb1ec CS |
2489 | if (found) |
2490 | return snp->smk_label; | |
2491 | } | |
07feee8f PM |
2492 | |
2493 | return NULL; | |
2494 | } | |
2495 | ||
e114e473 | 2496 | /** |
a2af0318 | 2497 | * smack_netlbl_add - Set the secattr on a socket |
e114e473 CS |
2498 | * @sk: the socket |
2499 | * | |
a2af0318 | 2500 | * Attach the outbound smack value (smk_out) to the socket. |
e114e473 CS |
2501 | * |
2502 | * Returns 0 on success or an error code | |
2503 | */ | |
a2af0318 | 2504 | static int smack_netlbl_add(struct sock *sk) |
e114e473 | 2505 | { |
07feee8f | 2506 | struct socket_smack *ssp = sk->sk_security; |
a2af0318 CS |
2507 | struct smack_known *skp = ssp->smk_out; |
2508 | int rc; | |
e114e473 | 2509 | |
6d3dc07c CS |
2510 | local_bh_disable(); |
2511 | bh_lock_sock_nested(sk); | |
2512 | ||
a2af0318 CS |
2513 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
2514 | switch (rc) { | |
2515 | case 0: | |
2516 | ssp->smk_state = SMK_NETLBL_LABELED; | |
2517 | break; | |
2518 | case -EDESTADDRREQ: | |
2519 | ssp->smk_state = SMK_NETLBL_REQSKB; | |
2520 | rc = 0; | |
2521 | break; | |
6d3dc07c CS |
2522 | } |
2523 | ||
2524 | bh_unlock_sock(sk); | |
2525 | local_bh_enable(); | |
4bc87e62 | 2526 | |
e114e473 CS |
2527 | return rc; |
2528 | } | |
2529 | ||
07feee8f | 2530 | /** |
a2af0318 CS |
2531 | * smack_netlbl_delete - Remove the secattr from a socket |
2532 | * @sk: the socket | |
2533 | * | |
2534 | * Remove the outbound smack value from a socket | |
2535 | */ | |
2536 | static void smack_netlbl_delete(struct sock *sk) | |
2537 | { | |
2538 | struct socket_smack *ssp = sk->sk_security; | |
2539 | ||
2540 | /* | |
2541 | * Take the label off the socket if one is set. | |
2542 | */ | |
2543 | if (ssp->smk_state != SMK_NETLBL_LABELED) | |
2544 | return; | |
2545 | ||
2546 | local_bh_disable(); | |
2547 | bh_lock_sock_nested(sk); | |
2548 | netlbl_sock_delattr(sk); | |
2549 | bh_unlock_sock(sk); | |
2550 | local_bh_enable(); | |
2551 | ssp->smk_state = SMK_NETLBL_UNLABELED; | |
2552 | } | |
2553 | ||
2554 | /** | |
2555 | * smk_ipv4_check - Perform IPv4 host access checks | |
07feee8f PM |
2556 | * @sk: the socket |
2557 | * @sap: the destination address | |
2558 | * | |
2559 | * Set the correct secattr for the given socket based on the destination | |
2560 | * address and perform any outbound access checks needed. | |
2561 | * | |
2562 | * Returns 0 on success or an error code. | |
2563 | * | |
2564 | */ | |
a2af0318 | 2565 | static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap) |
07feee8f | 2566 | { |
2f823ff8 | 2567 | struct smack_known *skp; |
a2af0318 | 2568 | int rc = 0; |
21c7eae2 | 2569 | struct smack_known *hkp; |
07feee8f | 2570 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2571 | struct smk_audit_info ad; |
07feee8f PM |
2572 | |
2573 | rcu_read_lock(); | |
21abb1ec | 2574 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2575 | if (hkp != NULL) { |
ecfcc53f | 2576 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2577 | struct lsm_network_audit net; |
2578 | ||
48c62af6 EP |
2579 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2580 | ad.a.u.net->family = sap->sin_family; | |
2581 | ad.a.u.net->dport = sap->sin_port; | |
2582 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2583 | #endif |
2f823ff8 | 2584 | skp = ssp->smk_out; |
21c7eae2 LP |
2585 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2586 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
a2af0318 CS |
2587 | /* |
2588 | * Clear the socket netlabel if it's set. | |
2589 | */ | |
2590 | if (!rc) | |
2591 | smack_netlbl_delete(sk); | |
07feee8f PM |
2592 | } |
2593 | rcu_read_unlock(); | |
07feee8f | 2594 | |
a2af0318 | 2595 | return rc; |
07feee8f PM |
2596 | } |
2597 | ||
21abb1ec CS |
2598 | /** |
2599 | * smk_ipv6_check - check Smack access | |
2600 | * @subject: subject Smack label | |
2601 | * @object: object Smack label | |
2602 | * @address: address | |
2603 | * @act: the action being taken | |
2604 | * | |
2605 | * Check an IPv6 access | |
2606 | */ | |
2607 | static int smk_ipv6_check(struct smack_known *subject, | |
2608 | struct smack_known *object, | |
2609 | struct sockaddr_in6 *address, int act) | |
2610 | { | |
2611 | #ifdef CONFIG_AUDIT | |
2612 | struct lsm_network_audit net; | |
2613 | #endif | |
2614 | struct smk_audit_info ad; | |
2615 | int rc; | |
2616 | ||
2617 | #ifdef CONFIG_AUDIT | |
2618 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2619 | ad.a.u.net->family = PF_INET6; | |
a5cd1ab7 | 2620 | ad.a.u.net->dport = address->sin6_port; |
21abb1ec CS |
2621 | if (act == SMK_RECEIVING) |
2622 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2623 | else | |
2624 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2625 | #endif | |
2626 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2627 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2628 | return rc; | |
2629 | } | |
21abb1ec CS |
2630 | |
2631 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2632 | /** |
2633 | * smk_ipv6_port_label - Smack port access table management | |
2634 | * @sock: socket | |
2635 | * @address: address | |
2636 | * | |
2637 | * Create or update the port list entry | |
2638 | */ | |
2639 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2640 | { | |
2641 | struct sock *sk = sock->sk; | |
2642 | struct sockaddr_in6 *addr6; | |
2643 | struct socket_smack *ssp = sock->sk->sk_security; | |
2644 | struct smk_port_label *spp; | |
2645 | unsigned short port = 0; | |
2646 | ||
2647 | if (address == NULL) { | |
2648 | /* | |
2649 | * This operation is changing the Smack information | |
2650 | * on the bound socket. Take the changes to the port | |
2651 | * as well. | |
2652 | */ | |
3c7ce342 VG |
2653 | rcu_read_lock(); |
2654 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2655 | if (sk != spp->smk_sock) |
2656 | continue; | |
2657 | spp->smk_in = ssp->smk_in; | |
2658 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2659 | rcu_read_unlock(); |
c6739443 CS |
2660 | return; |
2661 | } | |
2662 | /* | |
2663 | * A NULL address is only used for updating existing | |
2664 | * bound entries. If there isn't one, it's OK. | |
2665 | */ | |
3c7ce342 | 2666 | rcu_read_unlock(); |
c6739443 CS |
2667 | return; |
2668 | } | |
2669 | ||
2670 | addr6 = (struct sockaddr_in6 *)address; | |
2671 | port = ntohs(addr6->sin6_port); | |
2672 | /* | |
2673 | * This is a special case that is safely ignored. | |
2674 | */ | |
2675 | if (port == 0) | |
2676 | return; | |
2677 | ||
2678 | /* | |
2679 | * Look for an existing port list entry. | |
2680 | * This is an indication that a port is getting reused. | |
2681 | */ | |
3c7ce342 VG |
2682 | rcu_read_lock(); |
2683 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2684 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2685 | continue; |
0c96d1f5 VG |
2686 | if (spp->smk_can_reuse != 1) { |
2687 | rcu_read_unlock(); | |
2688 | return; | |
2689 | } | |
c6739443 CS |
2690 | spp->smk_port = port; |
2691 | spp->smk_sock = sk; | |
2692 | spp->smk_in = ssp->smk_in; | |
2693 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2694 | spp->smk_can_reuse = 0; |
3c7ce342 | 2695 | rcu_read_unlock(); |
c6739443 CS |
2696 | return; |
2697 | } | |
3c7ce342 | 2698 | rcu_read_unlock(); |
c6739443 CS |
2699 | /* |
2700 | * A new port entry is required. | |
2701 | */ | |
2702 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2703 | if (spp == NULL) | |
2704 | return; | |
2705 | ||
2706 | spp->smk_port = port; | |
2707 | spp->smk_sock = sk; | |
2708 | spp->smk_in = ssp->smk_in; | |
2709 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2710 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2711 | spp->smk_can_reuse = 0; |
c6739443 | 2712 | |
3c7ce342 VG |
2713 | mutex_lock(&smack_ipv6_lock); |
2714 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2715 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2716 | return; |
2717 | } | |
2718 | ||
2719 | /** | |
2720 | * smk_ipv6_port_check - check Smack port access | |
a1a07f22 | 2721 | * @sk: socket |
c6739443 | 2722 | * @address: address |
a1a07f22 | 2723 | * @act: the action being taken |
c6739443 CS |
2724 | * |
2725 | * Create or update the port list entry | |
2726 | */ | |
6ea06247 | 2727 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2728 | int act) |
2729 | { | |
c6739443 CS |
2730 | struct smk_port_label *spp; |
2731 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2732 | struct smack_known *skp = NULL; |
2733 | unsigned short port; | |
21c7eae2 | 2734 | struct smack_known *object; |
c6739443 CS |
2735 | |
2736 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2737 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2738 | object = ssp->smk_in; |
c6739443 | 2739 | } else { |
2f823ff8 | 2740 | skp = ssp->smk_out; |
21abb1ec | 2741 | object = smack_ipv6host_label(address); |
c6739443 CS |
2742 | } |
2743 | ||
2744 | /* | |
21abb1ec | 2745 | * The other end is a single label host. |
c6739443 | 2746 | */ |
21abb1ec CS |
2747 | if (skp != NULL && object != NULL) |
2748 | return smk_ipv6_check(skp, object, address, act); | |
2749 | if (skp == NULL) | |
2750 | skp = smack_net_ambient; | |
2751 | if (object == NULL) | |
2752 | object = smack_net_ambient; | |
c6739443 CS |
2753 | |
2754 | /* | |
2755 | * It's remote, so port lookup does no good. | |
2756 | */ | |
21abb1ec CS |
2757 | if (!smk_ipv6_localhost(address)) |
2758 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2759 | |
2760 | /* | |
2761 | * It's local so the send check has to have passed. | |
2762 | */ | |
21abb1ec CS |
2763 | if (act == SMK_RECEIVING) |
2764 | return 0; | |
c6739443 | 2765 | |
21abb1ec | 2766 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2767 | rcu_read_lock(); |
2768 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2769 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2770 | continue; |
21c7eae2 | 2771 | object = spp->smk_in; |
c6739443 | 2772 | if (act == SMK_CONNECTING) |
54e70ec5 | 2773 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2774 | break; |
2775 | } | |
3c7ce342 | 2776 | rcu_read_unlock(); |
c6739443 | 2777 | |
21abb1ec | 2778 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2779 | } |
222a96b3 | 2780 | #endif |
c6739443 | 2781 | |
e114e473 CS |
2782 | /** |
2783 | * smack_inode_setsecurity - set smack xattrs | |
2784 | * @inode: the object | |
2785 | * @name: attribute name | |
2786 | * @value: attribute value | |
2787 | * @size: size of the attribute | |
2788 | * @flags: unused | |
2789 | * | |
2790 | * Sets the named attribute in the appropriate blob | |
2791 | * | |
2792 | * Returns 0 on success, or an error code | |
2793 | */ | |
2794 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2795 | const void *value, size_t size, int flags) | |
2796 | { | |
2f823ff8 | 2797 | struct smack_known *skp; |
fb4021b6 | 2798 | struct inode_smack *nsp = smack_inode(inode); |
e114e473 CS |
2799 | struct socket_smack *ssp; |
2800 | struct socket *sock; | |
4bc87e62 | 2801 | int rc = 0; |
e114e473 | 2802 | |
f7112e6c | 2803 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2804 | return -EINVAL; |
e114e473 | 2805 | |
2f823ff8 | 2806 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2807 | if (IS_ERR(skp)) |
2808 | return PTR_ERR(skp); | |
e114e473 CS |
2809 | |
2810 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2811 | nsp->smk_inode = skp; |
ddd29ec6 | 2812 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2813 | return 0; |
2814 | } | |
2815 | /* | |
2816 | * The rest of the Smack xattrs are only on sockets. | |
2817 | */ | |
2818 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2819 | return -EOPNOTSUPP; | |
2820 | ||
2821 | sock = SOCKET_I(inode); | |
2e1d146a | 2822 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2823 | return -EOPNOTSUPP; |
2824 | ||
2825 | ssp = sock->sk->sk_security; | |
2826 | ||
2827 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2828 | ssp->smk_in = skp; |
e114e473 | 2829 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2830 | ssp->smk_out = skp; |
c6739443 | 2831 | if (sock->sk->sk_family == PF_INET) { |
a2af0318 | 2832 | rc = smack_netlbl_add(sock->sk); |
b4e0d5f0 CS |
2833 | if (rc != 0) |
2834 | printk(KERN_WARNING | |
2835 | "Smack: \"%s\" netlbl error %d.\n", | |
2836 | __func__, -rc); | |
2837 | } | |
e114e473 CS |
2838 | } else |
2839 | return -EOPNOTSUPP; | |
2840 | ||
21abb1ec | 2841 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2842 | if (sock->sk->sk_family == PF_INET6) |
2843 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2844 | #endif |
c6739443 | 2845 | |
e114e473 CS |
2846 | return 0; |
2847 | } | |
2848 | ||
2849 | /** | |
2850 | * smack_socket_post_create - finish socket setup | |
2851 | * @sock: the socket | |
2852 | * @family: protocol family | |
2853 | * @type: unused | |
2854 | * @protocol: unused | |
2855 | * @kern: unused | |
2856 | * | |
2857 | * Sets the netlabel information on the socket | |
2858 | * | |
2859 | * Returns 0 on success, and error code otherwise | |
2860 | */ | |
2861 | static int smack_socket_post_create(struct socket *sock, int family, | |
2862 | int type, int protocol, int kern) | |
2863 | { | |
7412301b ML |
2864 | struct socket_smack *ssp; |
2865 | ||
2866 | if (sock->sk == NULL) | |
2867 | return 0; | |
2868 | ||
2869 | /* | |
2870 | * Sockets created by kernel threads receive web label. | |
2871 | */ | |
2872 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2873 | ssp = sock->sk->sk_security; | |
2874 | ssp->smk_in = &smack_known_web; | |
2875 | ssp->smk_out = &smack_known_web; | |
2876 | } | |
2877 | ||
2878 | if (family != PF_INET) | |
e114e473 CS |
2879 | return 0; |
2880 | /* | |
2881 | * Set the outbound netlbl. | |
2882 | */ | |
a2af0318 | 2883 | return smack_netlbl_add(sock->sk); |
6d3dc07c CS |
2884 | } |
2885 | ||
5859cdf5 TG |
2886 | /** |
2887 | * smack_socket_socketpair - create socket pair | |
2888 | * @socka: one socket | |
2889 | * @sockb: another socket | |
2890 | * | |
2891 | * Cross reference the peer labels for SO_PEERSEC | |
2892 | * | |
a1a07f22 | 2893 | * Returns 0 |
5859cdf5 TG |
2894 | */ |
2895 | static int smack_socket_socketpair(struct socket *socka, | |
2896 | struct socket *sockb) | |
2897 | { | |
2898 | struct socket_smack *asp = socka->sk->sk_security; | |
2899 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2900 | ||
2901 | asp->smk_packet = bsp->smk_out; | |
2902 | bsp->smk_packet = asp->smk_out; | |
2903 | ||
2904 | return 0; | |
2905 | } | |
2906 | ||
21abb1ec | 2907 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2908 | /** |
2909 | * smack_socket_bind - record port binding information. | |
2910 | * @sock: the socket | |
2911 | * @address: the port address | |
2912 | * @addrlen: size of the address | |
2913 | * | |
2914 | * Records the label bound to a port. | |
2915 | * | |
b9ef5513 | 2916 | * Returns 0 on success, and error code otherwise |
c6739443 CS |
2917 | */ |
2918 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2919 | int addrlen) | |
2920 | { | |
b9ef5513 TH |
2921 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) { |
2922 | if (addrlen < SIN6_LEN_RFC2133 || | |
2923 | address->sa_family != AF_INET6) | |
2924 | return -EINVAL; | |
c6739443 | 2925 | smk_ipv6_port_label(sock, address); |
b9ef5513 | 2926 | } |
c6739443 CS |
2927 | return 0; |
2928 | } | |
21abb1ec | 2929 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2930 | |
6d3dc07c CS |
2931 | /** |
2932 | * smack_socket_connect - connect access check | |
2933 | * @sock: the socket | |
2934 | * @sap: the other end | |
2935 | * @addrlen: size of sap | |
2936 | * | |
2937 | * Verifies that a connection may be possible | |
2938 | * | |
2939 | * Returns 0 on success, and error code otherwise | |
2940 | */ | |
2941 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2942 | int addrlen) | |
2943 | { | |
c6739443 CS |
2944 | int rc = 0; |
2945 | ||
2946 | if (sock->sk == NULL) | |
6d3dc07c | 2947 | return 0; |
87fbfffc CS |
2948 | if (sock->sk->sk_family != PF_INET && |
2949 | (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6)) | |
2950 | return 0; | |
2951 | if (addrlen < offsetofend(struct sockaddr, sa_family)) | |
2952 | return 0; | |
2953 | if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) { | |
2954 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
00720f0e | 2955 | struct smack_known *rsp = NULL; |
da49b5da | 2956 | |
87fbfffc CS |
2957 | if (addrlen < SIN6_LEN_RFC2133) |
2958 | return 0; | |
00720f0e AB |
2959 | if (__is_defined(SMACK_IPV6_SECMARK_LABELING)) |
2960 | rsp = smack_ipv6host_label(sip); | |
87fbfffc CS |
2961 | if (rsp != NULL) { |
2962 | struct socket_smack *ssp = sock->sk->sk_security; | |
2963 | ||
21abb1ec | 2964 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, |
87fbfffc CS |
2965 | SMK_CONNECTING); |
2966 | } | |
222a96b3 SAS |
2967 | #ifdef SMACK_IPV6_PORT_LABELING |
2968 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2969 | #endif | |
00720f0e | 2970 | |
87fbfffc | 2971 | return rc; |
c6739443 | 2972 | } |
87fbfffc CS |
2973 | if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in)) |
2974 | return 0; | |
a2af0318 | 2975 | rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap); |
c6739443 | 2976 | return rc; |
e114e473 CS |
2977 | } |
2978 | ||
2979 | /** | |
2980 | * smack_flags_to_may - convert S_ to MAY_ values | |
2981 | * @flags: the S_ value | |
2982 | * | |
2983 | * Returns the equivalent MAY_ value | |
2984 | */ | |
2985 | static int smack_flags_to_may(int flags) | |
2986 | { | |
2987 | int may = 0; | |
2988 | ||
2989 | if (flags & S_IRUGO) | |
2990 | may |= MAY_READ; | |
2991 | if (flags & S_IWUGO) | |
2992 | may |= MAY_WRITE; | |
2993 | if (flags & S_IXUGO) | |
2994 | may |= MAY_EXEC; | |
2995 | ||
2996 | return may; | |
2997 | } | |
2998 | ||
2999 | /** | |
3000 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
3001 | * @msg: the object | |
3002 | * | |
3003 | * Returns 0 | |
3004 | */ | |
3005 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
3006 | { | |
ecd5f82e | 3007 | struct smack_known **blob = smack_msg_msg(msg); |
2f823ff8 | 3008 | |
ecd5f82e | 3009 | *blob = smk_of_current(); |
e114e473 CS |
3010 | return 0; |
3011 | } | |
3012 | ||
e114e473 | 3013 | /** |
0d79cbf8 EB |
3014 | * smack_of_ipc - the smack pointer for the ipc |
3015 | * @isp: the object | |
e114e473 CS |
3016 | * |
3017 | * Returns a pointer to the smack value | |
3018 | */ | |
0d79cbf8 | 3019 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 3020 | { |
019bcca4 CS |
3021 | struct smack_known **blob = smack_ipc(isp); |
3022 | ||
3023 | return *blob; | |
e114e473 CS |
3024 | } |
3025 | ||
3026 | /** | |
0d79cbf8 EB |
3027 | * smack_ipc_alloc_security - Set the security blob for ipc |
3028 | * @isp: the object | |
e114e473 CS |
3029 | * |
3030 | * Returns 0 | |
3031 | */ | |
0d79cbf8 | 3032 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 3033 | { |
019bcca4 | 3034 | struct smack_known **blob = smack_ipc(isp); |
e114e473 | 3035 | |
019bcca4 | 3036 | *blob = smk_of_current(); |
e114e473 CS |
3037 | return 0; |
3038 | } | |
3039 | ||
ecfcc53f EB |
3040 | /** |
3041 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 3042 | * @isp : the object |
ecfcc53f EB |
3043 | * @access : access requested |
3044 | * | |
3045 | * Returns 0 if current has the requested access, error code otherwise | |
3046 | */ | |
0d79cbf8 | 3047 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3048 | { |
0d79cbf8 | 3049 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3050 | struct smk_audit_info ad; |
d166c802 | 3051 | int rc; |
ecfcc53f EB |
3052 | |
3053 | #ifdef CONFIG_AUDIT | |
3054 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3055 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3056 | #endif |
d166c802 CS |
3057 | rc = smk_curacc(ssp, access, &ad); |
3058 | rc = smk_bu_current("shm", ssp, access, rc); | |
3059 | return rc; | |
ecfcc53f EB |
3060 | } |
3061 | ||
e114e473 CS |
3062 | /** |
3063 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 3064 | * @isp: the object |
e114e473 CS |
3065 | * @shmflg: access requested |
3066 | * | |
3067 | * Returns 0 if current has the requested access, error code otherwise | |
3068 | */ | |
0d79cbf8 | 3069 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3070 | { |
e114e473 CS |
3071 | int may; |
3072 | ||
3073 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3074 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3075 | } |
3076 | ||
3077 | /** | |
3078 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3079 | * @isp: the object |
e114e473 CS |
3080 | * @cmd: what it wants to do |
3081 | * | |
3082 | * Returns 0 if current has the requested access, error code otherwise | |
3083 | */ | |
0d79cbf8 | 3084 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3085 | { |
e114e473 CS |
3086 | int may; |
3087 | ||
3088 | switch (cmd) { | |
3089 | case IPC_STAT: | |
3090 | case SHM_STAT: | |
c21a6970 | 3091 | case SHM_STAT_ANY: |
e114e473 CS |
3092 | may = MAY_READ; |
3093 | break; | |
3094 | case IPC_SET: | |
3095 | case SHM_LOCK: | |
3096 | case SHM_UNLOCK: | |
3097 | case IPC_RMID: | |
3098 | may = MAY_READWRITE; | |
3099 | break; | |
3100 | case IPC_INFO: | |
3101 | case SHM_INFO: | |
3102 | /* | |
3103 | * System level information. | |
3104 | */ | |
3105 | return 0; | |
3106 | default: | |
3107 | return -EINVAL; | |
3108 | } | |
0d79cbf8 | 3109 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3110 | } |
3111 | ||
3112 | /** | |
3113 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3114 | * @isp: the object |
e114e473 CS |
3115 | * @shmaddr: unused |
3116 | * @shmflg: access requested | |
3117 | * | |
3118 | * Returns 0 if current has the requested access, error code otherwise | |
3119 | */ | |
a1a07f22 | 3120 | static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr, |
e114e473 CS |
3121 | int shmflg) |
3122 | { | |
e114e473 CS |
3123 | int may; |
3124 | ||
3125 | may = smack_flags_to_may(shmflg); | |
a1a07f22 | 3126 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3127 | } |
3128 | ||
ecfcc53f EB |
3129 | /** |
3130 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3131 | * @isp : the object |
ecfcc53f EB |
3132 | * @access : access requested |
3133 | * | |
3134 | * Returns 0 if current has the requested access, error code otherwise | |
3135 | */ | |
0d79cbf8 | 3136 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3137 | { |
0d79cbf8 | 3138 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3139 | struct smk_audit_info ad; |
d166c802 | 3140 | int rc; |
ecfcc53f EB |
3141 | |
3142 | #ifdef CONFIG_AUDIT | |
3143 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3144 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3145 | #endif |
d166c802 CS |
3146 | rc = smk_curacc(ssp, access, &ad); |
3147 | rc = smk_bu_current("sem", ssp, access, rc); | |
3148 | return rc; | |
ecfcc53f EB |
3149 | } |
3150 | ||
e114e473 CS |
3151 | /** |
3152 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3153 | * @isp: the object |
e114e473 CS |
3154 | * @semflg: access requested |
3155 | * | |
3156 | * Returns 0 if current has the requested access, error code otherwise | |
3157 | */ | |
0d79cbf8 | 3158 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3159 | { |
e114e473 CS |
3160 | int may; |
3161 | ||
3162 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3163 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3164 | } |
3165 | ||
3166 | /** | |
b57d0209 | 3167 | * smack_sem_semctl - Smack access check for sem |
0d79cbf8 | 3168 | * @isp: the object |
e114e473 CS |
3169 | * @cmd: what it wants to do |
3170 | * | |
3171 | * Returns 0 if current has the requested access, error code otherwise | |
3172 | */ | |
0d79cbf8 | 3173 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3174 | { |
e114e473 CS |
3175 | int may; |
3176 | ||
3177 | switch (cmd) { | |
3178 | case GETPID: | |
3179 | case GETNCNT: | |
3180 | case GETZCNT: | |
3181 | case GETVAL: | |
3182 | case GETALL: | |
3183 | case IPC_STAT: | |
3184 | case SEM_STAT: | |
a280d6dc | 3185 | case SEM_STAT_ANY: |
e114e473 CS |
3186 | may = MAY_READ; |
3187 | break; | |
3188 | case SETVAL: | |
3189 | case SETALL: | |
3190 | case IPC_RMID: | |
3191 | case IPC_SET: | |
3192 | may = MAY_READWRITE; | |
3193 | break; | |
3194 | case IPC_INFO: | |
3195 | case SEM_INFO: | |
3196 | /* | |
3197 | * System level information | |
3198 | */ | |
3199 | return 0; | |
3200 | default: | |
3201 | return -EINVAL; | |
3202 | } | |
3203 | ||
0d79cbf8 | 3204 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3205 | } |
3206 | ||
3207 | /** | |
3208 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3209 | * @isp: the object |
e114e473 CS |
3210 | * @sops: unused |
3211 | * @nsops: unused | |
3212 | * @alter: unused | |
3213 | * | |
3214 | * Treated as read and write in all cases. | |
3215 | * | |
3216 | * Returns 0 if access is allowed, error code otherwise | |
3217 | */ | |
0d79cbf8 | 3218 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3219 | unsigned nsops, int alter) |
3220 | { | |
0d79cbf8 | 3221 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3222 | } |
3223 | ||
ecfcc53f EB |
3224 | /** |
3225 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3226 | * @isp : the msq |
ecfcc53f EB |
3227 | * @access : access requested |
3228 | * | |
3229 | * return 0 if current has access, error otherwise | |
3230 | */ | |
0d79cbf8 | 3231 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3232 | { |
0d79cbf8 | 3233 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3234 | struct smk_audit_info ad; |
d166c802 | 3235 | int rc; |
ecfcc53f EB |
3236 | |
3237 | #ifdef CONFIG_AUDIT | |
3238 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3239 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3240 | #endif |
d166c802 CS |
3241 | rc = smk_curacc(msp, access, &ad); |
3242 | rc = smk_bu_current("msq", msp, access, rc); | |
3243 | return rc; | |
ecfcc53f EB |
3244 | } |
3245 | ||
e114e473 CS |
3246 | /** |
3247 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3248 | * @isp: the object |
e114e473 CS |
3249 | * @msqflg: access requested |
3250 | * | |
3251 | * Returns 0 if current has the requested access, error code otherwise | |
3252 | */ | |
0d79cbf8 | 3253 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3254 | { |
e114e473 CS |
3255 | int may; |
3256 | ||
3257 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3258 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3259 | } |
3260 | ||
3261 | /** | |
3262 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3263 | * @isp: the object |
e114e473 CS |
3264 | * @cmd: what it wants to do |
3265 | * | |
3266 | * Returns 0 if current has the requested access, error code otherwise | |
3267 | */ | |
0d79cbf8 | 3268 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3269 | { |
e114e473 CS |
3270 | int may; |
3271 | ||
3272 | switch (cmd) { | |
3273 | case IPC_STAT: | |
3274 | case MSG_STAT: | |
23c8cec8 | 3275 | case MSG_STAT_ANY: |
e114e473 CS |
3276 | may = MAY_READ; |
3277 | break; | |
3278 | case IPC_SET: | |
3279 | case IPC_RMID: | |
3280 | may = MAY_READWRITE; | |
3281 | break; | |
3282 | case IPC_INFO: | |
3283 | case MSG_INFO: | |
3284 | /* | |
3285 | * System level information | |
3286 | */ | |
3287 | return 0; | |
3288 | default: | |
3289 | return -EINVAL; | |
3290 | } | |
3291 | ||
0d79cbf8 | 3292 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3293 | } |
3294 | ||
3295 | /** | |
3296 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3297 | * @isp: the object |
e114e473 CS |
3298 | * @msg: unused |
3299 | * @msqflg: access requested | |
3300 | * | |
3301 | * Returns 0 if current has the requested access, error code otherwise | |
3302 | */ | |
0d79cbf8 | 3303 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3304 | int msqflg) |
3305 | { | |
ecfcc53f | 3306 | int may; |
e114e473 | 3307 | |
ecfcc53f | 3308 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3309 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3310 | } |
3311 | ||
3312 | /** | |
b57d0209 | 3313 | * smack_msg_queue_msgrcv - Smack access check for msg_queue |
0d79cbf8 | 3314 | * @isp: the object |
e114e473 CS |
3315 | * @msg: unused |
3316 | * @target: unused | |
3317 | * @type: unused | |
3318 | * @mode: unused | |
3319 | * | |
3320 | * Returns 0 if current has read and write access, error code otherwise | |
3321 | */ | |
b57d0209 CS |
3322 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, |
3323 | struct msg_msg *msg, | |
3324 | struct task_struct *target, long type, | |
3325 | int mode) | |
e114e473 | 3326 | { |
0d79cbf8 | 3327 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3328 | } |
3329 | ||
3330 | /** | |
3331 | * smack_ipc_permission - Smack access for ipc_permission() | |
3332 | * @ipp: the object permissions | |
3333 | * @flag: access requested | |
3334 | * | |
3335 | * Returns 0 if current has read and write access, error code otherwise | |
3336 | */ | |
3337 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3338 | { | |
019bcca4 CS |
3339 | struct smack_known **blob = smack_ipc(ipp); |
3340 | struct smack_known *iskp = *blob; | |
ecfcc53f EB |
3341 | int may = smack_flags_to_may(flag); |
3342 | struct smk_audit_info ad; | |
d166c802 | 3343 | int rc; |
e114e473 | 3344 | |
ecfcc53f EB |
3345 | #ifdef CONFIG_AUDIT |
3346 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3347 | ad.a.u.ipc_id = ipp->id; | |
3348 | #endif | |
21c7eae2 LP |
3349 | rc = smk_curacc(iskp, may, &ad); |
3350 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3351 | return rc; |
e114e473 CS |
3352 | } |
3353 | ||
d20bdda6 AD |
3354 | /** |
3355 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3356 | * @ipp: the object permissions |
d20bdda6 AD |
3357 | * @secid: where result will be saved |
3358 | */ | |
3359 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3360 | { | |
019bcca4 CS |
3361 | struct smack_known **blob = smack_ipc(ipp); |
3362 | struct smack_known *iskp = *blob; | |
d20bdda6 | 3363 | |
21c7eae2 | 3364 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3365 | } |
3366 | ||
e114e473 CS |
3367 | /** |
3368 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3369 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3370 | * @inode: the object |
3371 | * | |
3372 | * Set the inode's security blob if it hasn't been done already. | |
3373 | */ | |
3374 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3375 | { | |
3376 | struct super_block *sbp; | |
3377 | struct superblock_smack *sbsp; | |
3378 | struct inode_smack *isp; | |
2f823ff8 CS |
3379 | struct smack_known *skp; |
3380 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3381 | struct smack_known *final; |
5c6d1125 JS |
3382 | char trattr[TRANS_TRUE_SIZE]; |
3383 | int transflag = 0; | |
2267b13a | 3384 | int rc; |
e114e473 CS |
3385 | struct dentry *dp; |
3386 | ||
3387 | if (inode == NULL) | |
3388 | return; | |
3389 | ||
fb4021b6 | 3390 | isp = smack_inode(inode); |
e114e473 | 3391 | |
e114e473 CS |
3392 | /* |
3393 | * If the inode is already instantiated | |
3394 | * take the quick way out | |
3395 | */ | |
3396 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
921bb1cb | 3397 | return; |
e114e473 CS |
3398 | |
3399 | sbp = inode->i_sb; | |
1aea7808 | 3400 | sbsp = smack_superblock(sbp); |
e114e473 CS |
3401 | /* |
3402 | * We're going to use the superblock default label | |
3403 | * if there's no label on the file. | |
3404 | */ | |
3405 | final = sbsp->smk_default; | |
3406 | ||
e97dcb0e CS |
3407 | /* |
3408 | * If this is the root inode the superblock | |
3409 | * may be in the process of initialization. | |
3410 | * If that is the case use the root value out | |
3411 | * of the superblock. | |
3412 | */ | |
3413 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3414 | switch (sbp->s_magic) { |
3415 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3416 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3417 | /* |
3418 | * The cgroup filesystem is never mounted, | |
3419 | * so there's no opportunity to set the mount | |
3420 | * options. | |
3421 | */ | |
21c7eae2 LP |
3422 | sbsp->smk_root = &smack_known_star; |
3423 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3424 | isp->smk_inode = sbsp->smk_root; |
3425 | break; | |
3426 | case TMPFS_MAGIC: | |
3427 | /* | |
3428 | * What about shmem/tmpfs anonymous files with dentry | |
3429 | * obtained from d_alloc_pseudo()? | |
3430 | */ | |
3431 | isp->smk_inode = smk_of_current(); | |
3432 | break; | |
8da4aba5 RK |
3433 | case PIPEFS_MAGIC: |
3434 | isp->smk_inode = smk_of_current(); | |
3435 | break; | |
805b65a8 RK |
3436 | case SOCKFS_MAGIC: |
3437 | /* | |
3438 | * Socket access is controlled by the socket | |
3439 | * structures associated with the task involved. | |
3440 | */ | |
3441 | isp->smk_inode = &smack_known_star; | |
3442 | break; | |
1d8c2326 ŁS |
3443 | default: |
3444 | isp->smk_inode = sbsp->smk_root; | |
3445 | break; | |
36ea735b | 3446 | } |
e97dcb0e | 3447 | isp->smk_flags |= SMK_INODE_INSTANT; |
921bb1cb | 3448 | return; |
e97dcb0e CS |
3449 | } |
3450 | ||
e114e473 CS |
3451 | /* |
3452 | * This is pretty hackish. | |
3453 | * Casey says that we shouldn't have to do | |
3454 | * file system specific code, but it does help | |
3455 | * with keeping it simple. | |
3456 | */ | |
3457 | switch (sbp->s_magic) { | |
3458 | case SMACK_MAGIC: | |
36ea735b | 3459 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3460 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3461 | /* |
25985edc | 3462 | * Casey says that it's a little embarrassing |
e114e473 CS |
3463 | * that the smack file system doesn't do |
3464 | * extended attributes. | |
36ea735b | 3465 | * |
36ea735b | 3466 | * Cgroupfs is special |
e114e473 | 3467 | */ |
21c7eae2 | 3468 | final = &smack_known_star; |
e114e473 CS |
3469 | break; |
3470 | case DEVPTS_SUPER_MAGIC: | |
3471 | /* | |
3472 | * devpts seems content with the label of the task. | |
3473 | * Programs that change smack have to treat the | |
3474 | * pty with respect. | |
3475 | */ | |
21c7eae2 | 3476 | final = ckp; |
e114e473 | 3477 | break; |
e114e473 CS |
3478 | case PROC_SUPER_MAGIC: |
3479 | /* | |
3480 | * Casey says procfs appears not to care. | |
3481 | * The superblock default suffices. | |
3482 | */ | |
3483 | break; | |
3484 | case TMPFS_MAGIC: | |
3485 | /* | |
3486 | * Device labels should come from the filesystem, | |
3487 | * but watch out, because they're volitile, | |
3488 | * getting recreated on every reboot. | |
3489 | */ | |
21c7eae2 | 3490 | final = &smack_known_star; |
e114e473 | 3491 | /* |
e114e473 CS |
3492 | * If a smack value has been set we want to use it, |
3493 | * but since tmpfs isn't giving us the opportunity | |
3494 | * to set mount options simulate setting the | |
3495 | * superblock default. | |
3496 | */ | |
df561f66 | 3497 | fallthrough; |
e114e473 CS |
3498 | default: |
3499 | /* | |
3500 | * This isn't an understood special case. | |
3501 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3502 | */ |
3503 | ||
3504 | /* | |
3505 | * UNIX domain sockets use lower level socket data. | |
3506 | */ | |
3507 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3508 | final = &smack_known_star; |
b4e0d5f0 CS |
3509 | break; |
3510 | } | |
3511 | /* | |
e114e473 CS |
3512 | * No xattr support means, alas, no SMACK label. |
3513 | * Use the aforeapplied default. | |
3514 | * It would be curious if the label of the task | |
3515 | * does not match that assigned. | |
3516 | */ | |
5d6c3191 AG |
3517 | if (!(inode->i_opflags & IOP_XATTR)) |
3518 | break; | |
e114e473 CS |
3519 | /* |
3520 | * Get the dentry for xattr. | |
3521 | */ | |
3e62cbb8 | 3522 | dp = dget(opt_dentry); |
2f823ff8 | 3523 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3524 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3525 | final = skp; |
2267b13a CS |
3526 | |
3527 | /* | |
3528 | * Transmuting directory | |
3529 | */ | |
3530 | if (S_ISDIR(inode->i_mode)) { | |
3531 | /* | |
3532 | * If this is a new directory and the label was | |
3533 | * transmuted when the inode was initialized | |
3534 | * set the transmute attribute on the directory | |
3535 | * and mark the inode. | |
3536 | * | |
3537 | * If there is a transmute attribute on the | |
3538 | * directory mark the inode. | |
3539 | */ | |
baed456a RS |
3540 | rc = __vfs_getxattr(dp, inode, |
3541 | XATTR_NAME_SMACKTRANSMUTE, trattr, | |
3542 | TRANS_TRUE_SIZE); | |
3543 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3544 | TRANS_TRUE_SIZE) != 0) | |
3545 | rc = -EINVAL; | |
2267b13a CS |
3546 | if (rc >= 0) |
3547 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3548 | } |
809c02e0 SF |
3549 | /* |
3550 | * Don't let the exec or mmap label be "*" or "@". | |
3551 | */ | |
3552 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3553 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3554 | skp == &smack_known_web) | |
3555 | skp = NULL; | |
3556 | isp->smk_task = skp; | |
e774ad68 | 3557 | |
19760ad0 | 3558 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3559 | if (IS_ERR(skp) || skp == &smack_known_star || |
3560 | skp == &smack_known_web) | |
19760ad0 CS |
3561 | skp = NULL; |
3562 | isp->smk_mmap = skp; | |
676dac4b | 3563 | |
e114e473 CS |
3564 | dput(dp); |
3565 | break; | |
3566 | } | |
3567 | ||
3568 | if (final == NULL) | |
21c7eae2 | 3569 | isp->smk_inode = ckp; |
e114e473 CS |
3570 | else |
3571 | isp->smk_inode = final; | |
3572 | ||
5c6d1125 | 3573 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 | 3574 | |
e114e473 CS |
3575 | return; |
3576 | } | |
3577 | ||
3578 | /** | |
3579 | * smack_getprocattr - Smack process attribute access | |
3580 | * @p: the object task | |
3581 | * @name: the name of the attribute in /proc/.../attr | |
3582 | * @value: where to put the result | |
3583 | * | |
3584 | * Places a copy of the task Smack into value | |
3585 | * | |
3586 | * Returns the length of the smack label or an error code | |
3587 | */ | |
c8e477c6 | 3588 | static int smack_getprocattr(struct task_struct *p, const char *name, char **value) |
e114e473 | 3589 | { |
a3727a8b | 3590 | struct smack_known *skp = smk_of_task_struct_obj(p); |
e114e473 CS |
3591 | char *cp; |
3592 | int slen; | |
3593 | ||
3594 | if (strcmp(name, "current") != 0) | |
3595 | return -EINVAL; | |
3596 | ||
2f823ff8 | 3597 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3598 | if (cp == NULL) |
3599 | return -ENOMEM; | |
3600 | ||
3601 | slen = strlen(cp); | |
3602 | *value = cp; | |
3603 | return slen; | |
3604 | } | |
3605 | ||
3606 | /** | |
3607 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3608 | * @name: the name of the attribute in /proc/.../attr |
3609 | * @value: the value to set | |
3610 | * @size: the size of the value | |
3611 | * | |
3612 | * Sets the Smack value of the task. Only setting self | |
3613 | * is permitted and only with privilege | |
3614 | * | |
3615 | * Returns the length of the smack label or an error code | |
3616 | */ | |
b21507e2 | 3617 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3618 | { |
b17103a8 | 3619 | struct task_smack *tsp = smack_cred(current_cred()); |
d84f4f99 | 3620 | struct cred *new; |
2f823ff8 | 3621 | struct smack_known *skp; |
38416e53 ZJ |
3622 | struct smack_known_list_elem *sklep; |
3623 | int rc; | |
e114e473 | 3624 | |
38416e53 | 3625 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3626 | return -EPERM; |
3627 | ||
f7112e6c | 3628 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3629 | return -EINVAL; |
3630 | ||
3631 | if (strcmp(name, "current") != 0) | |
3632 | return -EINVAL; | |
3633 | ||
2f823ff8 | 3634 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3635 | if (IS_ERR(skp)) |
3636 | return PTR_ERR(skp); | |
e114e473 | 3637 | |
6d3dc07c | 3638 | /* |
7128ea15 HS |
3639 | * No process is ever allowed the web ("@") label |
3640 | * and the star ("*") label. | |
6d3dc07c | 3641 | */ |
7128ea15 HS |
3642 | if (skp == &smack_known_web || skp == &smack_known_star) |
3643 | return -EINVAL; | |
6d3dc07c | 3644 | |
38416e53 ZJ |
3645 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3646 | rc = -EPERM; | |
3647 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3648 | if (sklep->smk_label == skp) { | |
3649 | rc = 0; | |
3650 | break; | |
3651 | } | |
3652 | if (rc) | |
3653 | return rc; | |
3654 | } | |
3655 | ||
d84f4f99 | 3656 | new = prepare_creds(); |
6d3dc07c | 3657 | if (new == NULL) |
d84f4f99 | 3658 | return -ENOMEM; |
7898e1f8 | 3659 | |
b17103a8 | 3660 | tsp = smack_cred(new); |
2f823ff8 | 3661 | tsp->smk_task = skp; |
38416e53 ZJ |
3662 | /* |
3663 | * process can change its label only once | |
3664 | */ | |
3665 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3666 | |
d84f4f99 | 3667 | commit_creds(new); |
e114e473 CS |
3668 | return size; |
3669 | } | |
3670 | ||
3671 | /** | |
3672 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3673 | * @sock: one sock |
3674 | * @other: the other sock | |
e114e473 CS |
3675 | * @newsk: unused |
3676 | * | |
3677 | * Return 0 if a subject with the smack of sock could access | |
3678 | * an object with the smack of other, otherwise an error code | |
3679 | */ | |
3610cda5 DM |
3680 | static int smack_unix_stream_connect(struct sock *sock, |
3681 | struct sock *other, struct sock *newsk) | |
e114e473 | 3682 | { |
2f823ff8 | 3683 | struct smack_known *skp; |
54e70ec5 | 3684 | struct smack_known *okp; |
d2e7ad19 JM |
3685 | struct socket_smack *ssp = sock->sk_security; |
3686 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3687 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3688 | struct smk_audit_info ad; |
b4e0d5f0 | 3689 | int rc = 0; |
923e9a13 KC |
3690 | #ifdef CONFIG_AUDIT |
3691 | struct lsm_network_audit net; | |
923e9a13 | 3692 | #endif |
b4e0d5f0 | 3693 | |
2f823ff8 CS |
3694 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3695 | skp = ssp->smk_out; | |
96be7b54 | 3696 | okp = osp->smk_in; |
54e70ec5 CS |
3697 | #ifdef CONFIG_AUDIT |
3698 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3699 | smk_ad_setfield_u_net_sk(&ad, other); | |
3700 | #endif | |
21c7eae2 LP |
3701 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3702 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3703 | if (rc == 0) { |
96be7b54 ZJ |
3704 | okp = osp->smk_out; |
3705 | skp = ssp->smk_in; | |
138a868f | 3706 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3707 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3708 | MAY_WRITE, rc); |
3709 | } | |
2f823ff8 | 3710 | } |
b4e0d5f0 | 3711 | |
975d5e55 CS |
3712 | /* |
3713 | * Cross reference the peer labels for SO_PEERSEC. | |
3714 | */ | |
3715 | if (rc == 0) { | |
54e70ec5 CS |
3716 | nsp->smk_packet = ssp->smk_out; |
3717 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3718 | } |
3719 | ||
b4e0d5f0 | 3720 | return rc; |
e114e473 CS |
3721 | } |
3722 | ||
3723 | /** | |
3724 | * smack_unix_may_send - Smack access on UDS | |
3725 | * @sock: one socket | |
3726 | * @other: the other socket | |
3727 | * | |
3728 | * Return 0 if a subject with the smack of sock could access | |
3729 | * an object with the smack of other, otherwise an error code | |
3730 | */ | |
3731 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3732 | { | |
b4e0d5f0 CS |
3733 | struct socket_smack *ssp = sock->sk->sk_security; |
3734 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3735 | struct smk_audit_info ad; |
d166c802 | 3736 | int rc; |
e114e473 | 3737 | |
923e9a13 KC |
3738 | #ifdef CONFIG_AUDIT |
3739 | struct lsm_network_audit net; | |
3740 | ||
48c62af6 | 3741 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3742 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3743 | #endif |
b4e0d5f0 | 3744 | |
2f823ff8 CS |
3745 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3746 | return 0; | |
b4e0d5f0 | 3747 | |
21c7eae2 LP |
3748 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3749 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3750 | return rc; |
e114e473 CS |
3751 | } |
3752 | ||
6d3dc07c CS |
3753 | /** |
3754 | * smack_socket_sendmsg - Smack check based on destination host | |
3755 | * @sock: the socket | |
251a2a95 | 3756 | * @msg: the message |
6d3dc07c CS |
3757 | * @size: the size of the message |
3758 | * | |
c6739443 CS |
3759 | * Return 0 if the current subject can write to the destination host. |
3760 | * For IPv4 this is only a question if the destination is a single label host. | |
3761 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3762 | */ |
3763 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3764 | int size) | |
3765 | { | |
3766 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3767 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3768 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3769 | #endif |
3770 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3771 | struct socket_smack *ssp = sock->sk->sk_security; | |
3772 | struct smack_known *rsp; | |
3773 | #endif | |
c6739443 | 3774 | int rc = 0; |
6d3dc07c CS |
3775 | |
3776 | /* | |
3777 | * Perfectly reasonable for this to be NULL | |
3778 | */ | |
c6739443 | 3779 | if (sip == NULL) |
6d3dc07c CS |
3780 | return 0; |
3781 | ||
81bd0d56 | 3782 | switch (sock->sk->sk_family) { |
c6739443 | 3783 | case AF_INET: |
b9ef5513 TH |
3784 | if (msg->msg_namelen < sizeof(struct sockaddr_in) || |
3785 | sip->sin_family != AF_INET) | |
3786 | return -EINVAL; | |
a2af0318 | 3787 | rc = smk_ipv4_check(sock->sk, sip); |
c6739443 | 3788 | break; |
619ae03e | 3789 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3790 | case AF_INET6: |
b9ef5513 TH |
3791 | if (msg->msg_namelen < SIN6_LEN_RFC2133 || |
3792 | sap->sin6_family != AF_INET6) | |
3793 | return -EINVAL; | |
21abb1ec CS |
3794 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3795 | rsp = smack_ipv6host_label(sap); | |
3796 | if (rsp != NULL) | |
3797 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3798 | SMK_CONNECTING); | |
3799 | #endif | |
3800 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3801 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3802 | #endif |
619ae03e | 3803 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
c6739443 CS |
3804 | break; |
3805 | } | |
3806 | return rc; | |
6d3dc07c CS |
3807 | } |
3808 | ||
e114e473 | 3809 | /** |
251a2a95 | 3810 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3811 | * @sap: netlabel secattr |
272cd7a8 | 3812 | * @ssp: socket security information |
e114e473 | 3813 | * |
2f823ff8 | 3814 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3815 | */ |
2f823ff8 CS |
3816 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3817 | struct socket_smack *ssp) | |
e114e473 | 3818 | { |
2f823ff8 | 3819 | struct smack_known *skp; |
f7112e6c | 3820 | int found = 0; |
677264e8 CS |
3821 | int acat; |
3822 | int kcat; | |
e114e473 | 3823 | |
322dd63c CS |
3824 | /* |
3825 | * Netlabel found it in the cache. | |
3826 | */ | |
3827 | if ((sap->flags & NETLBL_SECATTR_CACHE) != 0) | |
3828 | return (struct smack_known *)sap->cache->data; | |
3829 | ||
3830 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) | |
3831 | /* | |
3832 | * Looks like a fallback, which gives us a secid. | |
3833 | */ | |
3834 | return smack_from_secid(sap->attr.secid); | |
3835 | ||
6d3dc07c | 3836 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3837 | /* |
6d3dc07c | 3838 | * Looks like a CIPSO packet. |
e114e473 CS |
3839 | * If there are flags but no level netlabel isn't |
3840 | * behaving the way we expect it to. | |
3841 | * | |
f7112e6c | 3842 | * Look it up in the label table |
e114e473 CS |
3843 | * Without guidance regarding the smack value |
3844 | * for the packet fall back on the network | |
3845 | * ambient value. | |
3846 | */ | |
f7112e6c | 3847 | rcu_read_lock(); |
348dc288 | 3848 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3849 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3850 | continue; |
677264e8 CS |
3851 | /* |
3852 | * Compare the catsets. Use the netlbl APIs. | |
3853 | */ | |
3854 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3855 | if ((skp->smk_netlabel.flags & | |
3856 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3857 | found = 1; | |
3858 | break; | |
3859 | } | |
3860 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3861 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3862 | acat + 1); | |
3863 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3864 | skp->smk_netlabel.attr.mls.cat, |
3865 | kcat + 1); | |
3866 | if (acat < 0 || kcat < 0) | |
3867 | break; | |
3868 | } | |
3869 | if (acat == kcat) { | |
3870 | found = 1; | |
3871 | break; | |
3872 | } | |
6d3dc07c | 3873 | } |
f7112e6c CS |
3874 | rcu_read_unlock(); |
3875 | ||
3876 | if (found) | |
2f823ff8 | 3877 | return skp; |
f7112e6c | 3878 | |
54e70ec5 | 3879 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3880 | return &smack_known_web; |
3881 | return &smack_known_star; | |
e114e473 | 3882 | } |
e114e473 | 3883 | /* |
6d3dc07c CS |
3884 | * Without guidance regarding the smack value |
3885 | * for the packet fall back on the network | |
3886 | * ambient value. | |
e114e473 | 3887 | */ |
272cd7a8 | 3888 | return smack_net_ambient; |
e114e473 CS |
3889 | } |
3890 | ||
69f287ae | 3891 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3892 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3893 | { |
c6739443 CS |
3894 | u8 nexthdr; |
3895 | int offset; | |
3896 | int proto = -EINVAL; | |
3897 | struct ipv6hdr _ipv6h; | |
3898 | struct ipv6hdr *ip6; | |
3899 | __be16 frag_off; | |
3900 | struct tcphdr _tcph, *th; | |
3901 | struct udphdr _udph, *uh; | |
3902 | struct dccp_hdr _dccph, *dh; | |
3903 | ||
3904 | sip->sin6_port = 0; | |
3905 | ||
3906 | offset = skb_network_offset(skb); | |
3907 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3908 | if (ip6 == NULL) | |
3909 | return -EINVAL; | |
3910 | sip->sin6_addr = ip6->saddr; | |
3911 | ||
3912 | nexthdr = ip6->nexthdr; | |
3913 | offset += sizeof(_ipv6h); | |
3914 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3915 | if (offset < 0) | |
3916 | return -EINVAL; | |
3917 | ||
3918 | proto = nexthdr; | |
3919 | switch (proto) { | |
3920 | case IPPROTO_TCP: | |
3921 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3922 | if (th != NULL) | |
3923 | sip->sin6_port = th->source; | |
3924 | break; | |
3925 | case IPPROTO_UDP: | |
a07ef951 | 3926 | case IPPROTO_UDPLITE: |
c6739443 CS |
3927 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3928 | if (uh != NULL) | |
3929 | sip->sin6_port = uh->source; | |
3930 | break; | |
3931 | case IPPROTO_DCCP: | |
3932 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3933 | if (dh != NULL) | |
3934 | sip->sin6_port = dh->dccph_sport; | |
3935 | break; | |
3936 | } | |
3937 | return proto; | |
3938 | } | |
69f287ae | 3939 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3940 | |
36be8129 CS |
3941 | /** |
3942 | * smack_from_skb - Smack data from the secmark in an skb | |
3943 | * @skb: packet | |
3944 | * | |
3945 | * Returns smack_known of the secmark or NULL if that won't work. | |
3946 | */ | |
bf0afe67 | 3947 | #ifdef CONFIG_NETWORK_SECMARK |
36be8129 CS |
3948 | static struct smack_known *smack_from_skb(struct sk_buff *skb) |
3949 | { | |
3950 | if (skb == NULL || skb->secmark == 0) | |
3951 | return NULL; | |
3952 | ||
3953 | return smack_from_secid(skb->secmark); | |
3954 | } | |
bf0afe67 CS |
3955 | #else |
3956 | static inline struct smack_known *smack_from_skb(struct sk_buff *skb) | |
3957 | { | |
3958 | return NULL; | |
3959 | } | |
3960 | #endif | |
36be8129 | 3961 | |
a2af0318 CS |
3962 | /** |
3963 | * smack_from_netlbl - Smack data from the IP options in an skb | |
3964 | * @sk: socket data came in on | |
3965 | * @family: address family | |
3966 | * @skb: packet | |
3967 | * | |
322dd63c CS |
3968 | * Find the Smack label in the IP options. If it hasn't been |
3969 | * added to the netlabel cache, add it here. | |
3970 | * | |
a2af0318 CS |
3971 | * Returns smack_known of the IP options or NULL if that won't work. |
3972 | */ | |
41dd9596 | 3973 | static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family, |
a2af0318 CS |
3974 | struct sk_buff *skb) |
3975 | { | |
3976 | struct netlbl_lsm_secattr secattr; | |
3977 | struct socket_smack *ssp = NULL; | |
3978 | struct smack_known *skp = NULL; | |
3979 | ||
3980 | netlbl_secattr_init(&secattr); | |
3981 | ||
3982 | if (sk) | |
3983 | ssp = sk->sk_security; | |
322dd63c CS |
3984 | |
3985 | if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) { | |
a2af0318 | 3986 | skp = smack_from_secattr(&secattr, ssp); |
322dd63c | 3987 | if (secattr.flags & NETLBL_SECATTR_CACHEABLE) |
9b0072e2 | 3988 | netlbl_cache_add(skb, family, &skp->smk_netlabel); |
322dd63c | 3989 | } |
a2af0318 CS |
3990 | |
3991 | netlbl_secattr_destroy(&secattr); | |
3992 | ||
3993 | return skp; | |
3994 | } | |
3995 | ||
e114e473 CS |
3996 | /** |
3997 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3998 | * @sk: socket | |
3999 | * @skb: packet | |
4000 | * | |
4001 | * Returns 0 if the packet should be delivered, an error code otherwise | |
4002 | */ | |
4003 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
4004 | { | |
e114e473 | 4005 | struct socket_smack *ssp = sk->sk_security; |
69f287ae | 4006 | struct smack_known *skp = NULL; |
c6739443 | 4007 | int rc = 0; |
ecfcc53f | 4008 | struct smk_audit_info ad; |
129a9989 | 4009 | u16 family = sk->sk_family; |
923e9a13 | 4010 | #ifdef CONFIG_AUDIT |
48c62af6 | 4011 | struct lsm_network_audit net; |
923e9a13 | 4012 | #endif |
69f287ae CS |
4013 | #if IS_ENABLED(CONFIG_IPV6) |
4014 | struct sockaddr_in6 sadd; | |
4015 | int proto; | |
129a9989 PS |
4016 | |
4017 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
4018 | family = PF_INET; | |
69f287ae CS |
4019 | #endif /* CONFIG_IPV6 */ |
4020 | ||
129a9989 | 4021 | switch (family) { |
c6739443 | 4022 | case PF_INET: |
69f287ae CS |
4023 | /* |
4024 | * If there is a secmark use it rather than the CIPSO label. | |
4025 | * If there is no secmark fall back to CIPSO. | |
4026 | * The secmark is assumed to reflect policy better. | |
4027 | */ | |
36be8129 | 4028 | skp = smack_from_skb(skb); |
a2af0318 CS |
4029 | if (skp == NULL) { |
4030 | skp = smack_from_netlbl(sk, family, skb); | |
4031 | if (skp == NULL) | |
4032 | skp = smack_net_ambient; | |
69f287ae | 4033 | } |
6d3dc07c | 4034 | |
ecfcc53f | 4035 | #ifdef CONFIG_AUDIT |
c6739443 | 4036 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 4037 | ad.a.u.net->family = family; |
c6739443 CS |
4038 | ad.a.u.net->netif = skb->skb_iif; |
4039 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 4040 | #endif |
c6739443 CS |
4041 | /* |
4042 | * Receiving a packet requires that the other end | |
4043 | * be able to write here. Read access is not required. | |
4044 | * This is the simplist possible security model | |
4045 | * for networking. | |
4046 | */ | |
21c7eae2 LP |
4047 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4048 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 4049 | MAY_WRITE, rc); |
c6739443 | 4050 | if (rc != 0) |
129a9989 | 4051 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 4052 | break; |
69f287ae | 4053 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 4054 | case PF_INET6: |
69f287ae | 4055 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
4056 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
4057 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 4058 | break; |
21abb1ec | 4059 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
4060 | skp = smack_from_skb(skb); |
4061 | if (skp == NULL) { | |
4062 | if (smk_ipv6_localhost(&sadd)) | |
4063 | break; | |
21abb1ec | 4064 | skp = smack_ipv6host_label(&sadd); |
36be8129 CS |
4065 | if (skp == NULL) |
4066 | skp = smack_net_ambient; | |
4067 | } | |
69f287ae CS |
4068 | #ifdef CONFIG_AUDIT |
4069 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 4070 | ad.a.u.net->family = family; |
69f287ae CS |
4071 | ad.a.u.net->netif = skb->skb_iif; |
4072 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4073 | #endif /* CONFIG_AUDIT */ | |
4074 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4075 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4076 | MAY_WRITE, rc); | |
21abb1ec CS |
4077 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4078 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4079 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4080 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
4081 | if (rc != 0) |
4082 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
4083 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 4084 | break; |
69f287ae | 4085 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4086 | } |
69f287ae | 4087 | |
a8134296 | 4088 | return rc; |
e114e473 CS |
4089 | } |
4090 | ||
4091 | /** | |
4092 | * smack_socket_getpeersec_stream - pull in packet label | |
4093 | * @sock: the socket | |
4094 | * @optval: user's destination | |
4095 | * @optlen: size thereof | |
251a2a95 | 4096 | * @len: max thereof |
e114e473 CS |
4097 | * |
4098 | * returns zero on success, an error code otherwise | |
4099 | */ | |
4100 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
b10b9c34 PM |
4101 | sockptr_t optval, sockptr_t optlen, |
4102 | unsigned int len) | |
e114e473 CS |
4103 | { |
4104 | struct socket_smack *ssp; | |
272cd7a8 | 4105 | char *rcp = ""; |
b10b9c34 | 4106 | u32 slen = 1; |
e114e473 CS |
4107 | int rc = 0; |
4108 | ||
4109 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4110 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4111 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4112 | slen = strlen(rcp) + 1; |
4113 | } | |
b10b9c34 | 4114 | if (slen > len) { |
e114e473 | 4115 | rc = -ERANGE; |
b10b9c34 PM |
4116 | goto out_len; |
4117 | } | |
e114e473 | 4118 | |
b10b9c34 PM |
4119 | if (copy_to_sockptr(optval, rcp, slen)) |
4120 | rc = -EFAULT; | |
4121 | out_len: | |
4122 | if (copy_to_sockptr(optlen, &slen, sizeof(slen))) | |
e114e473 | 4123 | rc = -EFAULT; |
e114e473 CS |
4124 | return rc; |
4125 | } | |
4126 | ||
4127 | ||
4128 | /** | |
4129 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4130 | * @sock: the peer socket |
e114e473 CS |
4131 | * @skb: packet data |
4132 | * @secid: pointer to where to put the secid of the packet | |
4133 | * | |
4134 | * Sets the netlabel socket state on sk from parent | |
4135 | */ | |
4136 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4137 | struct sk_buff *skb, u32 *secid) | |
4138 | ||
4139 | { | |
272cd7a8 | 4140 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4141 | struct smack_known *skp; |
a2af0318 | 4142 | struct sock *sk = NULL; |
b4e0d5f0 CS |
4143 | int family = PF_UNSPEC; |
4144 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 | 4145 | |
b4e0d5f0 CS |
4146 | if (skb != NULL) { |
4147 | if (skb->protocol == htons(ETH_P_IP)) | |
4148 | family = PF_INET; | |
69f287ae | 4149 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4150 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4151 | family = PF_INET6; | |
69f287ae | 4152 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4153 | } |
b4e0d5f0 CS |
4154 | if (family == PF_UNSPEC && sock != NULL) |
4155 | family = sock->sk->sk_family; | |
e114e473 | 4156 | |
69f287ae CS |
4157 | switch (family) { |
4158 | case PF_UNIX: | |
272cd7a8 | 4159 | ssp = sock->sk->sk_security; |
2f823ff8 | 4160 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4161 | break; |
4162 | case PF_INET: | |
36be8129 CS |
4163 | skp = smack_from_skb(skb); |
4164 | if (skp) { | |
4165 | s = skp->smk_secid; | |
69f287ae | 4166 | break; |
36be8129 | 4167 | } |
b4e0d5f0 CS |
4168 | /* |
4169 | * Translate what netlabel gave us. | |
4170 | */ | |
a2af0318 CS |
4171 | if (sock != NULL) |
4172 | sk = sock->sk; | |
4173 | skp = smack_from_netlbl(sk, family, skb); | |
4174 | if (skp != NULL) | |
2f823ff8 | 4175 | s = skp->smk_secid; |
69f287ae | 4176 | break; |
69f287ae | 4177 | case PF_INET6: |
21abb1ec | 4178 | #ifdef SMACK_IPV6_SECMARK_LABELING |
36be8129 CS |
4179 | skp = smack_from_skb(skb); |
4180 | if (skp) | |
4181 | s = skp->smk_secid; | |
21abb1ec | 4182 | #endif |
69f287ae | 4183 | break; |
b4e0d5f0 CS |
4184 | } |
4185 | *secid = s; | |
e114e473 CS |
4186 | if (s == 0) |
4187 | return -EINVAL; | |
e114e473 CS |
4188 | return 0; |
4189 | } | |
4190 | ||
4191 | /** | |
07feee8f PM |
4192 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4193 | * @sk: child sock | |
4194 | * @parent: parent socket | |
e114e473 | 4195 | * |
07feee8f PM |
4196 | * Set the smk_{in,out} state of an existing sock based on the process that |
4197 | * is creating the new socket. | |
e114e473 CS |
4198 | */ |
4199 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4200 | { | |
4201 | struct socket_smack *ssp; | |
2f823ff8 | 4202 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4203 | |
07feee8f PM |
4204 | if (sk == NULL || |
4205 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4206 | return; |
4207 | ||
4208 | ssp = sk->sk_security; | |
54e70ec5 | 4209 | ssp->smk_in = skp; |
2f823ff8 | 4210 | ssp->smk_out = skp; |
07feee8f | 4211 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4212 | } |
4213 | ||
4214 | /** | |
4215 | * smack_inet_conn_request - Smack access check on connect | |
4216 | * @sk: socket involved | |
4217 | * @skb: packet | |
4218 | * @req: unused | |
4219 | * | |
4220 | * Returns 0 if a task with the packet label could write to | |
4221 | * the socket, otherwise an error code | |
4222 | */ | |
41dd9596 | 4223 | static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb, |
e114e473 CS |
4224 | struct request_sock *req) |
4225 | { | |
07feee8f | 4226 | u16 family = sk->sk_family; |
f7112e6c | 4227 | struct smack_known *skp; |
e114e473 | 4228 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4229 | struct sockaddr_in addr; |
4230 | struct iphdr *hdr; | |
21c7eae2 | 4231 | struct smack_known *hskp; |
e114e473 | 4232 | int rc; |
ecfcc53f | 4233 | struct smk_audit_info ad; |
923e9a13 | 4234 | #ifdef CONFIG_AUDIT |
48c62af6 | 4235 | struct lsm_network_audit net; |
923e9a13 | 4236 | #endif |
e114e473 | 4237 | |
69f287ae | 4238 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4239 | if (family == PF_INET6) { |
4240 | /* | |
4241 | * Handle mapped IPv4 packets arriving | |
4242 | * via IPv6 sockets. Don't set up netlabel | |
4243 | * processing on IPv6. | |
4244 | */ | |
4245 | if (skb->protocol == htons(ETH_P_IP)) | |
4246 | family = PF_INET; | |
4247 | else | |
4248 | return 0; | |
4249 | } | |
69f287ae | 4250 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4251 | |
7f368ad3 CS |
4252 | /* |
4253 | * If there is a secmark use it rather than the CIPSO label. | |
4254 | * If there is no secmark fall back to CIPSO. | |
4255 | * The secmark is assumed to reflect policy better. | |
4256 | */ | |
36be8129 | 4257 | skp = smack_from_skb(skb); |
a2af0318 CS |
4258 | if (skp == NULL) { |
4259 | skp = smack_from_netlbl(sk, family, skb); | |
4260 | if (skp == NULL) | |
4261 | skp = &smack_known_huh; | |
7f368ad3 | 4262 | } |
7f368ad3 | 4263 | |
ecfcc53f | 4264 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4265 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4266 | ad.a.u.net->family = family; | |
4267 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4268 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4269 | #endif | |
e114e473 | 4270 | /* |
07feee8f PM |
4271 | * Receiving a packet requires that the other end be able to write |
4272 | * here. Read access is not required. | |
e114e473 | 4273 | */ |
21c7eae2 LP |
4274 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4275 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4276 | if (rc != 0) |
4277 | return rc; | |
4278 | ||
4279 | /* | |
4280 | * Save the peer's label in the request_sock so we can later setup | |
4281 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4282 | */ | |
2f823ff8 | 4283 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4284 | |
4285 | /* | |
4286 | * We need to decide if we want to label the incoming connection here | |
4287 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4288 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4289 | */ |
4290 | hdr = ip_hdr(skb); | |
4291 | addr.sin_addr.s_addr = hdr->saddr; | |
4292 | rcu_read_lock(); | |
21abb1ec | 4293 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4294 | rcu_read_unlock(); |
4295 | ||
21c7eae2 | 4296 | if (hskp == NULL) |
f7112e6c | 4297 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4298 | else |
07feee8f | 4299 | netlbl_req_delattr(req); |
e114e473 CS |
4300 | |
4301 | return rc; | |
4302 | } | |
4303 | ||
07feee8f PM |
4304 | /** |
4305 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4306 | * @sk: the new socket | |
4307 | * @req: the connection's request_sock | |
4308 | * | |
4309 | * Transfer the connection's peer label to the newly created socket. | |
4310 | */ | |
4311 | static void smack_inet_csk_clone(struct sock *sk, | |
4312 | const struct request_sock *req) | |
4313 | { | |
4314 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4315 | struct smack_known *skp; |
07feee8f | 4316 | |
2f823ff8 CS |
4317 | if (req->peer_secid != 0) { |
4318 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4319 | ssp->smk_packet = skp; |
2f823ff8 | 4320 | } else |
272cd7a8 | 4321 | ssp->smk_packet = NULL; |
07feee8f PM |
4322 | } |
4323 | ||
e114e473 CS |
4324 | /* |
4325 | * Key management security hooks | |
4326 | * | |
4327 | * Casey has not tested key support very heavily. | |
4328 | * The permission check is most likely too restrictive. | |
4329 | * If you care about keys please have a look. | |
4330 | */ | |
4331 | #ifdef CONFIG_KEYS | |
4332 | ||
4333 | /** | |
4334 | * smack_key_alloc - Set the key security blob | |
4335 | * @key: object | |
d84f4f99 | 4336 | * @cred: the credentials to use |
e114e473 CS |
4337 | * @flags: unused |
4338 | * | |
4339 | * No allocation required | |
4340 | * | |
4341 | * Returns 0 | |
4342 | */ | |
d84f4f99 | 4343 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4344 | unsigned long flags) |
4345 | { | |
b17103a8 | 4346 | struct smack_known *skp = smk_of_task(smack_cred(cred)); |
2f823ff8 | 4347 | |
21c7eae2 | 4348 | key->security = skp; |
e114e473 CS |
4349 | return 0; |
4350 | } | |
4351 | ||
4352 | /** | |
4353 | * smack_key_free - Clear the key security blob | |
4354 | * @key: the object | |
4355 | * | |
4356 | * Clear the blob pointer | |
4357 | */ | |
4358 | static void smack_key_free(struct key *key) | |
4359 | { | |
4360 | key->security = NULL; | |
4361 | } | |
4362 | ||
1a28979b | 4363 | /** |
e114e473 CS |
4364 | * smack_key_permission - Smack access on a key |
4365 | * @key_ref: gets to the object | |
d84f4f99 | 4366 | * @cred: the credentials to use |
8c0637e9 | 4367 | * @need_perm: requested key permission |
e114e473 CS |
4368 | * |
4369 | * Return 0 if the task has read and write to the object, | |
4370 | * an error code otherwise | |
4371 | */ | |
4372 | static int smack_key_permission(key_ref_t key_ref, | |
8c0637e9 DH |
4373 | const struct cred *cred, |
4374 | enum key_need_perm need_perm) | |
e114e473 CS |
4375 | { |
4376 | struct key *keyp; | |
ecfcc53f | 4377 | struct smk_audit_info ad; |
b17103a8 | 4378 | struct smack_known *tkp = smk_of_task(smack_cred(cred)); |
fffea214 | 4379 | int request = 0; |
d166c802 | 4380 | int rc; |
e114e473 | 4381 | |
5b841bfa ZM |
4382 | /* |
4383 | * Validate requested permissions | |
4384 | */ | |
8c0637e9 DH |
4385 | switch (need_perm) { |
4386 | case KEY_NEED_READ: | |
4387 | case KEY_NEED_SEARCH: | |
4388 | case KEY_NEED_VIEW: | |
4389 | request |= MAY_READ; | |
4390 | break; | |
4391 | case KEY_NEED_WRITE: | |
4392 | case KEY_NEED_LINK: | |
4393 | case KEY_NEED_SETATTR: | |
4394 | request |= MAY_WRITE; | |
4395 | break; | |
4396 | case KEY_NEED_UNSPECIFIED: | |
4397 | case KEY_NEED_UNLINK: | |
4398 | case KEY_SYSADMIN_OVERRIDE: | |
4399 | case KEY_AUTHTOKEN_OVERRIDE: | |
4400 | case KEY_DEFER_PERM_CHECK: | |
4401 | return 0; | |
4402 | default: | |
5b841bfa | 4403 | return -EINVAL; |
8c0637e9 | 4404 | } |
5b841bfa | 4405 | |
e114e473 CS |
4406 | keyp = key_ref_to_ptr(key_ref); |
4407 | if (keyp == NULL) | |
4408 | return -EINVAL; | |
4409 | /* | |
4410 | * If the key hasn't been initialized give it access so that | |
4411 | * it may do so. | |
4412 | */ | |
4413 | if (keyp->security == NULL) | |
4414 | return 0; | |
4415 | /* | |
4416 | * This should not occur | |
4417 | */ | |
2f823ff8 | 4418 | if (tkp == NULL) |
e114e473 | 4419 | return -EACCES; |
d19dfe58 | 4420 | |
a8478a60 | 4421 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
d19dfe58 CS |
4422 | return 0; |
4423 | ||
ecfcc53f EB |
4424 | #ifdef CONFIG_AUDIT |
4425 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4426 | ad.a.u.key_struct.key = keyp->serial; | |
4427 | ad.a.u.key_struct.key_desc = keyp->description; | |
4428 | #endif | |
d166c802 CS |
4429 | rc = smk_access(tkp, keyp->security, request, &ad); |
4430 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4431 | return rc; | |
e114e473 | 4432 | } |
7fc5f36e JB |
4433 | |
4434 | /* | |
4435 | * smack_key_getsecurity - Smack label tagging the key | |
4436 | * @key points to the key to be queried | |
4437 | * @_buffer points to a pointer that should be set to point to the | |
4438 | * resulting string (if no label or an error occurs). | |
4439 | * Return the length of the string (including terminating NUL) or -ve if | |
4440 | * an error. | |
4441 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4442 | */ | |
4443 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4444 | { | |
4445 | struct smack_known *skp = key->security; | |
4446 | size_t length; | |
4447 | char *copy; | |
4448 | ||
4449 | if (key->security == NULL) { | |
4450 | *_buffer = NULL; | |
4451 | return 0; | |
4452 | } | |
4453 | ||
4454 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4455 | if (copy == NULL) | |
4456 | return -ENOMEM; | |
4457 | length = strlen(copy) + 1; | |
4458 | ||
4459 | *_buffer = copy; | |
4460 | return length; | |
4461 | } | |
4462 | ||
a8478a60 DH |
4463 | |
4464 | #ifdef CONFIG_KEY_NOTIFICATIONS | |
4465 | /** | |
4466 | * smack_watch_key - Smack access to watch a key for notifications. | |
4467 | * @key: The key to be watched | |
4468 | * | |
4469 | * Return 0 if the @watch->cred has permission to read from the key object and | |
4470 | * an error otherwise. | |
4471 | */ | |
4472 | static int smack_watch_key(struct key *key) | |
4473 | { | |
4474 | struct smk_audit_info ad; | |
4475 | struct smack_known *tkp = smk_of_current(); | |
4476 | int rc; | |
4477 | ||
4478 | if (key == NULL) | |
4479 | return -EINVAL; | |
4480 | /* | |
4481 | * If the key hasn't been initialized give it access so that | |
4482 | * it may do so. | |
4483 | */ | |
4484 | if (key->security == NULL) | |
4485 | return 0; | |
4486 | /* | |
4487 | * This should not occur | |
4488 | */ | |
4489 | if (tkp == NULL) | |
4490 | return -EACCES; | |
4491 | ||
4492 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) | |
4493 | return 0; | |
4494 | ||
4495 | #ifdef CONFIG_AUDIT | |
4496 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4497 | ad.a.u.key_struct.key = key->serial; | |
4498 | ad.a.u.key_struct.key_desc = key->description; | |
4499 | #endif | |
4500 | rc = smk_access(tkp, key->security, MAY_READ, &ad); | |
4501 | rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc); | |
4502 | return rc; | |
4503 | } | |
4504 | #endif /* CONFIG_KEY_NOTIFICATIONS */ | |
e114e473 CS |
4505 | #endif /* CONFIG_KEYS */ |
4506 | ||
a8478a60 DH |
4507 | #ifdef CONFIG_WATCH_QUEUE |
4508 | /** | |
4509 | * smack_post_notification - Smack access to post a notification to a queue | |
4510 | * @w_cred: The credentials of the watcher. | |
4511 | * @cred: The credentials of the event source (may be NULL). | |
4512 | * @n: The notification message to be posted. | |
4513 | */ | |
4514 | static int smack_post_notification(const struct cred *w_cred, | |
4515 | const struct cred *cred, | |
4516 | struct watch_notification *n) | |
4517 | { | |
4518 | struct smk_audit_info ad; | |
4519 | struct smack_known *subj, *obj; | |
4520 | int rc; | |
4521 | ||
4522 | /* Always let maintenance notifications through. */ | |
4523 | if (n->type == WATCH_TYPE_META) | |
4524 | return 0; | |
4525 | ||
4526 | if (!cred) | |
4527 | return 0; | |
4528 | subj = smk_of_task(smack_cred(cred)); | |
4529 | obj = smk_of_task(smack_cred(w_cred)); | |
4530 | ||
4531 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION); | |
4532 | rc = smk_access(subj, obj, MAY_WRITE, &ad); | |
4533 | rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc); | |
4534 | return rc; | |
4535 | } | |
4536 | #endif /* CONFIG_WATCH_QUEUE */ | |
4537 | ||
d20bdda6 AD |
4538 | /* |
4539 | * Smack Audit hooks | |
4540 | * | |
4541 | * Audit requires a unique representation of each Smack specific | |
4542 | * rule. This unique representation is used to distinguish the | |
4543 | * object to be audited from remaining kernel objects and also | |
4544 | * works as a glue between the audit hooks. | |
4545 | * | |
4546 | * Since repository entries are added but never deleted, we'll use | |
4547 | * the smack_known label address related to the given audit rule as | |
4548 | * the needed unique representation. This also better fits the smack | |
4549 | * model where nearly everything is a label. | |
4550 | */ | |
4551 | #ifdef CONFIG_AUDIT | |
4552 | ||
4553 | /** | |
4554 | * smack_audit_rule_init - Initialize a smack audit rule | |
4555 | * @field: audit rule fields given from user-space (audit.h) | |
4556 | * @op: required testing operator (=, !=, >, <, ...) | |
4557 | * @rulestr: smack label to be audited | |
4558 | * @vrule: pointer to save our own audit rule representation | |
4559 | * | |
4560 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4561 | * The label to be audited is created if necessay. | |
4562 | */ | |
4563 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4564 | { | |
21c7eae2 | 4565 | struct smack_known *skp; |
d20bdda6 AD |
4566 | char **rule = (char **)vrule; |
4567 | *rule = NULL; | |
4568 | ||
4569 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4570 | return -EINVAL; | |
4571 | ||
5af75d8d | 4572 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4573 | return -EINVAL; |
4574 | ||
21c7eae2 | 4575 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4576 | if (IS_ERR(skp)) |
4577 | return PTR_ERR(skp); | |
4578 | ||
4579 | *rule = skp->smk_known; | |
d20bdda6 AD |
4580 | |
4581 | return 0; | |
4582 | } | |
4583 | ||
4584 | /** | |
4585 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4586 | * @krule: rule of interest, in Audit kernel representation format | |
4587 | * | |
4588 | * This is used to filter Smack rules from remaining Audit ones. | |
4589 | * If it's proved that this rule belongs to us, the | |
4590 | * audit_rule_match hook will be called to do the final judgement. | |
4591 | */ | |
4592 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4593 | { | |
4594 | struct audit_field *f; | |
4595 | int i; | |
4596 | ||
4597 | for (i = 0; i < krule->field_count; i++) { | |
4598 | f = &krule->fields[i]; | |
4599 | ||
4600 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4601 | return 1; | |
4602 | } | |
4603 | ||
4604 | return 0; | |
4605 | } | |
4606 | ||
4607 | /** | |
4608 | * smack_audit_rule_match - Audit given object ? | |
4609 | * @secid: security id for identifying the object to test | |
4610 | * @field: audit rule flags given from user-space | |
4611 | * @op: required testing operator | |
4612 | * @vrule: smack internal rule presentation | |
d20bdda6 AD |
4613 | * |
4614 | * The core Audit hook. It's used to take the decision of | |
4615 | * whether to audit or not to audit a given object. | |
4616 | */ | |
90462a5b | 4617 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule) |
d20bdda6 | 4618 | { |
2f823ff8 | 4619 | struct smack_known *skp; |
d20bdda6 AD |
4620 | char *rule = vrule; |
4621 | ||
4eb0f4ab RGB |
4622 | if (unlikely(!rule)) { |
4623 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4624 | return -ENOENT; |
4625 | } | |
4626 | ||
4627 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4628 | return 0; | |
4629 | ||
2f823ff8 | 4630 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4631 | |
4632 | /* | |
4633 | * No need to do string comparisons. If a match occurs, | |
4634 | * both pointers will point to the same smack_known | |
4635 | * label. | |
4636 | */ | |
5af75d8d | 4637 | if (op == Audit_equal) |
2f823ff8 | 4638 | return (rule == skp->smk_known); |
5af75d8d | 4639 | if (op == Audit_not_equal) |
2f823ff8 | 4640 | return (rule != skp->smk_known); |
d20bdda6 AD |
4641 | |
4642 | return 0; | |
4643 | } | |
4644 | ||
491a0b08 CS |
4645 | /* |
4646 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4647 | * No memory was allocated. |
4648 | */ | |
d20bdda6 AD |
4649 | |
4650 | #endif /* CONFIG_AUDIT */ | |
4651 | ||
746df9b5 DQ |
4652 | /** |
4653 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4654 | * @name: Full xattr name to check. | |
4655 | */ | |
4656 | static int smack_ismaclabel(const char *name) | |
4657 | { | |
4658 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4659 | } | |
4660 | ||
4661 | ||
251a2a95 | 4662 | /** |
e114e473 CS |
4663 | * smack_secid_to_secctx - return the smack label for a secid |
4664 | * @secid: incoming integer | |
4665 | * @secdata: destination | |
4666 | * @seclen: how long it is | |
4667 | * | |
4668 | * Exists for networking code. | |
4669 | */ | |
4670 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4671 | { | |
2f823ff8 | 4672 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4673 | |
d5630b9d | 4674 | if (secdata) |
2f823ff8 CS |
4675 | *secdata = skp->smk_known; |
4676 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4677 | return 0; |
4678 | } | |
4679 | ||
251a2a95 | 4680 | /** |
4bc87e62 CS |
4681 | * smack_secctx_to_secid - return the secid for a smack label |
4682 | * @secdata: smack label | |
4683 | * @seclen: how long result is | |
4684 | * @secid: outgoing integer | |
4685 | * | |
4686 | * Exists for audit and networking code. | |
4687 | */ | |
e52c1764 | 4688 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4689 | { |
21c7eae2 LP |
4690 | struct smack_known *skp = smk_find_entry(secdata); |
4691 | ||
4692 | if (skp) | |
4693 | *secid = skp->smk_secid; | |
4694 | else | |
4695 | *secid = 0; | |
4bc87e62 CS |
4696 | return 0; |
4697 | } | |
4698 | ||
491a0b08 CS |
4699 | /* |
4700 | * There used to be a smack_release_secctx hook | |
4701 | * that did nothing back when hooks were in a vector. | |
4702 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4703 | */ |
e114e473 | 4704 | |
1ee65e37 DQ |
4705 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4706 | { | |
c7c7a1a1 TA |
4707 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, |
4708 | ctxlen, 0); | |
1ee65e37 DQ |
4709 | } |
4710 | ||
4711 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4712 | { | |
39f60c1c | 4713 | return __vfs_setxattr_noperm(&nop_mnt_idmap, dentry, XATTR_NAME_SMACK, |
c7c7a1a1 | 4714 | ctx, ctxlen, 0); |
1ee65e37 DQ |
4715 | } |
4716 | ||
4717 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4718 | { | |
0f8983cf | 4719 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4720 | |
0f8983cf CS |
4721 | *ctx = skp->smk_known; |
4722 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4723 | return 0; |
4724 | } | |
4725 | ||
d6d80cb5 CS |
4726 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4727 | { | |
4728 | ||
4729 | struct task_smack *tsp; | |
4730 | struct smack_known *skp; | |
4731 | struct inode_smack *isp; | |
4732 | struct cred *new_creds = *new; | |
4733 | ||
4734 | if (new_creds == NULL) { | |
4735 | new_creds = prepare_creds(); | |
4736 | if (new_creds == NULL) | |
4737 | return -ENOMEM; | |
4738 | } | |
4739 | ||
b17103a8 | 4740 | tsp = smack_cred(new_creds); |
d6d80cb5 CS |
4741 | |
4742 | /* | |
4743 | * Get label from overlay inode and set it in create_sid | |
4744 | */ | |
387ef964 | 4745 | isp = smack_inode(d_inode(dentry)); |
d6d80cb5 CS |
4746 | skp = isp->smk_inode; |
4747 | tsp->smk_task = skp; | |
4748 | *new = new_creds; | |
4749 | return 0; | |
4750 | } | |
4751 | ||
4752 | static int smack_inode_copy_up_xattr(const char *name) | |
4753 | { | |
4754 | /* | |
4755 | * Return 1 if this is the smack access Smack attribute. | |
4756 | */ | |
4757 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4758 | return 1; | |
4759 | ||
4760 | return -EOPNOTSUPP; | |
4761 | } | |
4762 | ||
4763 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4764 | struct qstr *name, | |
4765 | const struct cred *old, | |
4766 | struct cred *new) | |
4767 | { | |
b17103a8 CS |
4768 | struct task_smack *otsp = smack_cred(old); |
4769 | struct task_smack *ntsp = smack_cred(new); | |
d6d80cb5 CS |
4770 | struct inode_smack *isp; |
4771 | int may; | |
4772 | ||
4773 | /* | |
4774 | * Use the process credential unless all of | |
4775 | * the transmuting criteria are met | |
4776 | */ | |
4777 | ntsp->smk_task = otsp->smk_task; | |
4778 | ||
4779 | /* | |
4780 | * the attribute of the containing directory | |
4781 | */ | |
fb4021b6 | 4782 | isp = smack_inode(d_inode(dentry->d_parent)); |
d6d80cb5 CS |
4783 | |
4784 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4785 | rcu_read_lock(); | |
4786 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4787 | isp->smk_inode->smk_known, | |
4788 | &otsp->smk_task->smk_rules); | |
4789 | rcu_read_unlock(); | |
4790 | ||
4791 | /* | |
4792 | * If the directory is transmuting and the rule | |
4793 | * providing access is transmuting use the containing | |
4794 | * directory label instead of the process label. | |
4795 | */ | |
2c085f3a | 4796 | if (may > 0 && (may & MAY_TRANSMUTE)) { |
d6d80cb5 | 4797 | ntsp->smk_task = isp->smk_inode; |
2c085f3a RS |
4798 | ntsp->smk_transmuted = ntsp->smk_task; |
4799 | } | |
d6d80cb5 CS |
4800 | } |
4801 | return 0; | |
4802 | } | |
4803 | ||
d9d8c939 CS |
4804 | #ifdef CONFIG_IO_URING |
4805 | /** | |
4806 | * smack_uring_override_creds - Is io_uring cred override allowed? | |
4807 | * @new: the target creds | |
4808 | * | |
4809 | * Check to see if the current task is allowed to override it's credentials | |
4810 | * to service an io_uring operation. | |
4811 | */ | |
4812 | static int smack_uring_override_creds(const struct cred *new) | |
4813 | { | |
4814 | struct task_smack *tsp = smack_cred(current_cred()); | |
4815 | struct task_smack *nsp = smack_cred(new); | |
4816 | ||
4817 | /* | |
4818 | * Allow the degenerate case where the new Smack value is | |
4819 | * the same as the current Smack value. | |
4820 | */ | |
4821 | if (tsp->smk_task == nsp->smk_task) | |
4822 | return 0; | |
4823 | ||
4824 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) | |
4825 | return 0; | |
4826 | ||
4827 | return -EPERM; | |
4828 | } | |
4829 | ||
4830 | /** | |
4831 | * smack_uring_sqpoll - check if a io_uring polling thread can be created | |
4832 | * | |
4833 | * Check to see if the current task is allowed to create a new io_uring | |
4834 | * kernel polling thread. | |
4835 | */ | |
4836 | static int smack_uring_sqpoll(void) | |
4837 | { | |
4838 | if (smack_privileged_cred(CAP_MAC_ADMIN, current_cred())) | |
4839 | return 0; | |
4840 | ||
4841 | return -EPERM; | |
4842 | } | |
4843 | ||
dd937340 CS |
4844 | /** |
4845 | * smack_uring_cmd - check on file operations for io_uring | |
4846 | * @ioucmd: the command in question | |
4847 | * | |
4848 | * Make a best guess about whether a io_uring "command" should | |
4849 | * be allowed. Use the same logic used for determining if the | |
4850 | * file could be opened for read in the absence of better criteria. | |
4851 | */ | |
4852 | static int smack_uring_cmd(struct io_uring_cmd *ioucmd) | |
4853 | { | |
4854 | struct file *file = ioucmd->file; | |
4855 | struct smk_audit_info ad; | |
4856 | struct task_smack *tsp; | |
4857 | struct inode *inode; | |
4858 | int rc; | |
4859 | ||
4860 | if (!file) | |
4861 | return -EINVAL; | |
4862 | ||
4863 | tsp = smack_cred(file->f_cred); | |
4864 | inode = file_inode(file); | |
4865 | ||
4866 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); | |
4867 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
4868 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); | |
4869 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); | |
4870 | ||
4871 | return rc; | |
4872 | } | |
4873 | ||
d9d8c939 CS |
4874 | #endif /* CONFIG_IO_URING */ |
4875 | ||
f22f9aaf | 4876 | struct lsm_blob_sizes smack_blob_sizes __ro_after_init = { |
bbd3662a | 4877 | .lbs_cred = sizeof(struct task_smack), |
33bf60ca | 4878 | .lbs_file = sizeof(struct smack_known *), |
afb1cbe3 | 4879 | .lbs_inode = sizeof(struct inode_smack), |
ecd5f82e CS |
4880 | .lbs_ipc = sizeof(struct smack_known *), |
4881 | .lbs_msg_msg = sizeof(struct smack_known *), | |
1aea7808 | 4882 | .lbs_superblock = sizeof(struct superblock_smack), |
6bcdfd2c | 4883 | .lbs_xattr_count = SMACK_INODE_INIT_XATTRS, |
bbd3662a CS |
4884 | }; |
4885 | ||
f22f9aaf | 4886 | static struct security_hook_list smack_hooks[] __ro_after_init = { |
e20b043a CS |
4887 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4888 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4889 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4890 | ||
0b52075e | 4891 | LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup), |
2febd254 DH |
4892 | LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param), |
4893 | ||
e20b043a | 4894 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), |
204cc0cc | 4895 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 4896 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 4897 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 4898 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a | 4899 | |
b8bff599 | 4900 | LSM_HOOK_INIT(bprm_creds_for_exec, smack_bprm_creds_for_exec), |
e20b043a CS |
4901 | |
4902 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
e20b043a CS |
4903 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), |
4904 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4905 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4906 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4907 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4908 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4909 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4910 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4911 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4912 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4913 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4914 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
44faac01 CB |
4915 | LSM_HOOK_INIT(inode_set_acl, smack_inode_set_acl), |
4916 | LSM_HOOK_INIT(inode_get_acl, smack_inode_get_acl), | |
4917 | LSM_HOOK_INIT(inode_remove_acl, smack_inode_remove_acl), | |
e20b043a CS |
4918 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), |
4919 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4920 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4921 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4922 | ||
e20b043a | 4923 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
e20b043a CS |
4924 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), |
4925 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4926 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4927 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4928 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4929 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4930 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4931 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4932 | ||
4933 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4934 | ||
4935 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4936 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4937 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4938 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4939 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4940 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4941 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4942 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4943 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4944 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
6326948f | 4945 | LSM_HOOK_INIT(current_getsecid_subj, smack_current_getsecid_subj), |
1fb057dc | 4946 | LSM_HOOK_INIT(task_getsecid_obj, smack_task_getsecid_obj), |
e20b043a CS |
4947 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), |
4948 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4949 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4950 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4951 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4952 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4953 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4954 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4955 | ||
4956 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4957 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4958 | ||
4959 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
e20b043a | 4960 | |
0d79cbf8 | 4961 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4962 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4963 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4964 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4965 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4966 | ||
0d79cbf8 | 4967 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4968 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4969 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4970 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4971 | ||
0d79cbf8 | 4972 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
e20b043a CS |
4973 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4974 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4975 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4976 | ||
4977 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4978 | ||
4979 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4980 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4981 | ||
4982 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4983 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4984 | ||
4985 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4986 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4987 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4988 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4989 | #endif |
e20b043a CS |
4990 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4991 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4992 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4993 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4994 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4995 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4996 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4ca165fc | 4997 | LSM_HOOK_INIT(sk_clone_security, smack_sk_clone_security), |
e20b043a CS |
4998 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), |
4999 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
5000 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 5001 | |
e114e473 CS |
5002 | /* key management security hooks */ |
5003 | #ifdef CONFIG_KEYS | |
e20b043a CS |
5004 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
5005 | LSM_HOOK_INIT(key_free, smack_key_free), | |
5006 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
5007 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
a8478a60 DH |
5008 | #ifdef CONFIG_KEY_NOTIFICATIONS |
5009 | LSM_HOOK_INIT(watch_key, smack_watch_key), | |
5010 | #endif | |
e114e473 | 5011 | #endif /* CONFIG_KEYS */ |
d20bdda6 | 5012 | |
a8478a60 DH |
5013 | #ifdef CONFIG_WATCH_QUEUE |
5014 | LSM_HOOK_INIT(post_notification, smack_post_notification), | |
5015 | #endif | |
5016 | ||
d20bdda6 AD |
5017 | /* Audit hooks */ |
5018 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
5019 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
5020 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
5021 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
5022 | #endif /* CONFIG_AUDIT */ |
5023 | ||
e20b043a CS |
5024 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
5025 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
5026 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
5027 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
5028 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
5029 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
5030 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
5031 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
5032 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
d9d8c939 CS |
5033 | #ifdef CONFIG_IO_URING |
5034 | LSM_HOOK_INIT(uring_override_creds, smack_uring_override_creds), | |
5035 | LSM_HOOK_INIT(uring_sqpoll, smack_uring_sqpoll), | |
dd937340 | 5036 | LSM_HOOK_INIT(uring_cmd, smack_uring_cmd), |
d9d8c939 | 5037 | #endif |
e114e473 CS |
5038 | }; |
5039 | ||
7198e2ee | 5040 | |
86812bb0 | 5041 | static __init void init_smack_known_list(void) |
7198e2ee | 5042 | { |
86812bb0 CS |
5043 | /* |
5044 | * Initialize rule list locks | |
5045 | */ | |
5046 | mutex_init(&smack_known_huh.smk_rules_lock); | |
5047 | mutex_init(&smack_known_hat.smk_rules_lock); | |
5048 | mutex_init(&smack_known_floor.smk_rules_lock); | |
5049 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
5050 | mutex_init(&smack_known_web.smk_rules_lock); |
5051 | /* | |
5052 | * Initialize rule lists | |
5053 | */ | |
5054 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
5055 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
5056 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
5057 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
5058 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
5059 | /* | |
5060 | * Create the known labels list | |
5061 | */ | |
4d7cf4a1 TS |
5062 | smk_insert_entry(&smack_known_huh); |
5063 | smk_insert_entry(&smack_known_hat); | |
5064 | smk_insert_entry(&smack_known_star); | |
5065 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 5066 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
5067 | } |
5068 | ||
e114e473 CS |
5069 | /** |
5070 | * smack_init - initialize the smack system | |
5071 | * | |
a1a07f22 | 5072 | * Returns 0 on success, -ENOMEM is there's no memory |
e114e473 CS |
5073 | */ |
5074 | static __init int smack_init(void) | |
5075 | { | |
bbd3662a | 5076 | struct cred *cred = (struct cred *) current->cred; |
676dac4b | 5077 | struct task_smack *tsp; |
d84f4f99 | 5078 | |
4e328b08 | 5079 | smack_rule_cache = KMEM_CACHE(smack_rule, 0); |
4ca75287 | 5080 | if (!smack_rule_cache) |
4e328b08 | 5081 | return -ENOMEM; |
4e328b08 | 5082 | |
bbd3662a CS |
5083 | /* |
5084 | * Set the security state for the initial task. | |
5085 | */ | |
5086 | tsp = smack_cred(cred); | |
5087 | init_task_smack(tsp, &smack_known_floor, &smack_known_floor); | |
5088 | ||
5089 | /* | |
5090 | * Register with LSM | |
5091 | */ | |
5092 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); | |
d21b7b04 JB |
5093 | smack_enabled = 1; |
5094 | ||
21abb1ec CS |
5095 | pr_info("Smack: Initializing.\n"); |
5096 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
5097 | pr_info("Smack: Netfilter enabled.\n"); | |
5098 | #endif | |
5099 | #ifdef SMACK_IPV6_PORT_LABELING | |
5100 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
5101 | #endif | |
5102 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
5103 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
5104 | #endif | |
e114e473 | 5105 | |
86812bb0 CS |
5106 | /* initialize the smack_known_list */ |
5107 | init_smack_known_list(); | |
e114e473 | 5108 | |
e114e473 CS |
5109 | return 0; |
5110 | } | |
5111 | ||
5112 | /* | |
5113 | * Smack requires early initialization in order to label | |
5114 | * all processes and objects when they are created. | |
5115 | */ | |
3d6e5f6d | 5116 | DEFINE_LSM(smack) = { |
07aed2f2 | 5117 | .name = "smack", |
14bd99c8 | 5118 | .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, |
bbd3662a | 5119 | .blobs = &smack_blob_sizes, |
3d6e5f6d KC |
5120 | .init = smack_init, |
5121 | }; |