Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
d66a8acb | 31 | #include <linux/icmpv6.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e114e473 CS |
33 | #include <linux/mutex.h> |
34 | #include <linux/pipe_fs_i.h> | |
e114e473 | 35 | #include <net/cipso_ipv4.h> |
c6739443 CS |
36 | #include <net/ip.h> |
37 | #include <net/ipv6.h> | |
d20bdda6 | 38 | #include <linux/audit.h> |
1fd7317d | 39 | #include <linux/magic.h> |
2a7dba39 | 40 | #include <linux/dcache.h> |
16014d87 | 41 | #include <linux/personality.h> |
40401530 AV |
42 | #include <linux/msg.h> |
43 | #include <linux/shm.h> | |
44 | #include <linux/binfmts.h> | |
3bf2789c | 45 | #include <linux/parser.h> |
2febd254 DH |
46 | #include <linux/fs_context.h> |
47 | #include <linux/fs_parser.h> | |
e114e473 CS |
48 | #include "smack.h" |
49 | ||
5c6d1125 JS |
50 | #define TRANS_TRUE "TRUE" |
51 | #define TRANS_TRUE_SIZE 4 | |
52 | ||
c6739443 CS |
53 | #define SMK_CONNECTING 0 |
54 | #define SMK_RECEIVING 1 | |
55 | #define SMK_SENDING 2 | |
56 | ||
21abb1ec | 57 | #ifdef SMACK_IPV6_PORT_LABELING |
3c7ce342 | 58 | DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 59 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 60 | #endif |
1a5b472b | 61 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 62 | int smack_enabled; |
c6739443 | 63 | |
c3300aaf AV |
64 | #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s} |
65 | static struct { | |
66 | const char *name; | |
67 | int len; | |
68 | int opt; | |
69 | } smk_mount_opts[] = { | |
70 | A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute) | |
3bf2789c | 71 | }; |
c3300aaf AV |
72 | #undef A |
73 | ||
74 | static int match_opt_prefix(char *s, int l, char **arg) | |
75 | { | |
76 | int i; | |
77 | ||
78 | for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) { | |
79 | size_t len = smk_mount_opts[i].len; | |
80 | if (len > l || memcmp(s, smk_mount_opts[i].name, len)) | |
81 | continue; | |
82 | if (len == l || s[len] != '=') | |
83 | continue; | |
84 | *arg = s + len + 1; | |
85 | return smk_mount_opts[i].opt; | |
86 | } | |
87 | return Opt_error; | |
88 | } | |
3bf2789c | 89 | |
3d04c924 CS |
90 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
91 | static char *smk_bu_mess[] = { | |
92 | "Bringup Error", /* Unused */ | |
93 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
94 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
95 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
96 | }; | |
97 | ||
d166c802 CS |
98 | static void smk_bu_mode(int mode, char *s) |
99 | { | |
100 | int i = 0; | |
101 | ||
102 | if (mode & MAY_READ) | |
103 | s[i++] = 'r'; | |
104 | if (mode & MAY_WRITE) | |
105 | s[i++] = 'w'; | |
106 | if (mode & MAY_EXEC) | |
107 | s[i++] = 'x'; | |
108 | if (mode & MAY_APPEND) | |
109 | s[i++] = 'a'; | |
110 | if (mode & MAY_TRANSMUTE) | |
111 | s[i++] = 't'; | |
112 | if (mode & MAY_LOCK) | |
113 | s[i++] = 'l'; | |
114 | if (i == 0) | |
115 | s[i++] = '-'; | |
116 | s[i] = '\0'; | |
117 | } | |
118 | #endif | |
119 | ||
120 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
121 | static int smk_bu_note(char *note, struct smack_known *sskp, |
122 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
123 | { |
124 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
125 | ||
126 | if (rc <= 0) | |
127 | return rc; | |
bf4b2fee CS |
128 | if (rc > SMACK_UNCONFINED_OBJECT) |
129 | rc = 0; | |
d166c802 CS |
130 | |
131 | smk_bu_mode(mode, acc); | |
bf4b2fee | 132 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 133 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
134 | return 0; |
135 | } | |
136 | #else | |
21c7eae2 | 137 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
138 | #endif |
139 | ||
140 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
141 | static int smk_bu_current(char *note, struct smack_known *oskp, |
142 | int mode, int rc) | |
d166c802 CS |
143 | { |
144 | struct task_smack *tsp = current_security(); | |
145 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
146 | ||
147 | if (rc <= 0) | |
148 | return rc; | |
bf4b2fee CS |
149 | if (rc > SMACK_UNCONFINED_OBJECT) |
150 | rc = 0; | |
d166c802 CS |
151 | |
152 | smk_bu_mode(mode, acc); | |
bf4b2fee | 153 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
154 | tsp->smk_task->smk_known, oskp->smk_known, |
155 | acc, current->comm, note); | |
d166c802 CS |
156 | return 0; |
157 | } | |
158 | #else | |
21c7eae2 | 159 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
160 | #endif |
161 | ||
162 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
163 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
164 | { | |
165 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 166 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
167 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
168 | ||
169 | if (rc <= 0) | |
170 | return rc; | |
bf4b2fee CS |
171 | if (rc > SMACK_UNCONFINED_OBJECT) |
172 | rc = 0; | |
d166c802 CS |
173 | |
174 | smk_bu_mode(mode, acc); | |
bf4b2fee | 175 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 176 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
177 | current->comm, otp->comm); |
178 | return 0; | |
179 | } | |
180 | #else | |
181 | #define smk_bu_task(otp, mode, RC) (RC) | |
182 | #endif | |
183 | ||
184 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
185 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
186 | { | |
187 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 188 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
189 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
190 | ||
bf4b2fee CS |
191 | if (isp->smk_flags & SMK_INODE_IMPURE) |
192 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
193 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
194 | ||
d166c802 CS |
195 | if (rc <= 0) |
196 | return rc; | |
bf4b2fee CS |
197 | if (rc > SMACK_UNCONFINED_OBJECT) |
198 | rc = 0; | |
199 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
200 | (mode & (MAY_WRITE | MAY_APPEND))) | |
201 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
202 | |
203 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
204 | |
205 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
206 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
207 | inode->i_sb->s_id, inode->i_ino, current->comm); |
208 | return 0; | |
209 | } | |
210 | #else | |
211 | #define smk_bu_inode(inode, mode, RC) (RC) | |
212 | #endif | |
213 | ||
214 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
215 | static int smk_bu_file(struct file *file, int mode, int rc) | |
216 | { | |
217 | struct task_smack *tsp = current_security(); | |
218 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 219 | struct inode *inode = file_inode(file); |
bf4b2fee | 220 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
221 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
222 | ||
bf4b2fee CS |
223 | if (isp->smk_flags & SMK_INODE_IMPURE) |
224 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
225 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
226 | ||
d166c802 CS |
227 | if (rc <= 0) |
228 | return rc; | |
bf4b2fee CS |
229 | if (rc > SMACK_UNCONFINED_OBJECT) |
230 | rc = 0; | |
d166c802 CS |
231 | |
232 | smk_bu_mode(mode, acc); | |
bf4b2fee | 233 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 234 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 235 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
236 | current->comm); |
237 | return 0; | |
238 | } | |
239 | #else | |
240 | #define smk_bu_file(file, mode, RC) (RC) | |
241 | #endif | |
242 | ||
243 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
244 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
245 | int mode, int rc) | |
246 | { | |
247 | struct task_smack *tsp = cred->security; | |
248 | struct smack_known *sskp = tsp->smk_task; | |
45063097 | 249 | struct inode *inode = file_inode(file); |
bf4b2fee | 250 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
251 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
252 | ||
bf4b2fee CS |
253 | if (isp->smk_flags & SMK_INODE_IMPURE) |
254 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
255 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
256 | ||
d166c802 CS |
257 | if (rc <= 0) |
258 | return rc; | |
bf4b2fee CS |
259 | if (rc > SMACK_UNCONFINED_OBJECT) |
260 | rc = 0; | |
d166c802 CS |
261 | |
262 | smk_bu_mode(mode, acc); | |
bf4b2fee | 263 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 264 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 265 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
266 | current->comm); |
267 | return 0; | |
268 | } | |
269 | #else | |
270 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
271 | #endif | |
272 | ||
e114e473 CS |
273 | /** |
274 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 275 | * @name: type of the label (attribute) |
e114e473 CS |
276 | * @ip: a pointer to the inode |
277 | * @dp: a pointer to the dentry | |
278 | * | |
e774ad68 LP |
279 | * Returns a pointer to the master list entry for the Smack label, |
280 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 281 | */ |
2f823ff8 CS |
282 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
283 | struct dentry *dp) | |
e114e473 CS |
284 | { |
285 | int rc; | |
f7112e6c | 286 | char *buffer; |
2f823ff8 | 287 | struct smack_known *skp = NULL; |
e114e473 | 288 | |
5d6c3191 | 289 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 290 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 291 | |
f7112e6c CS |
292 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
293 | if (buffer == NULL) | |
e774ad68 | 294 | return ERR_PTR(-ENOMEM); |
e114e473 | 295 | |
5d6c3191 | 296 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
297 | if (rc < 0) |
298 | skp = ERR_PTR(rc); | |
299 | else if (rc == 0) | |
300 | skp = NULL; | |
301 | else | |
2f823ff8 | 302 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
303 | |
304 | kfree(buffer); | |
305 | ||
2f823ff8 | 306 | return skp; |
e114e473 CS |
307 | } |
308 | ||
309 | /** | |
310 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 311 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
312 | * |
313 | * Returns the new blob or NULL if there's no memory available | |
314 | */ | |
1eddfe8e | 315 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
316 | { |
317 | struct inode_smack *isp; | |
318 | ||
1a5b472b | 319 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
320 | if (isp == NULL) |
321 | return NULL; | |
322 | ||
21c7eae2 | 323 | isp->smk_inode = skp; |
e114e473 CS |
324 | isp->smk_flags = 0; |
325 | mutex_init(&isp->smk_lock); | |
326 | ||
327 | return isp; | |
328 | } | |
329 | ||
7898e1f8 CS |
330 | /** |
331 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
332 | * @task: a pointer to the Smack label for the running task |
333 | * @forked: a pointer to the Smack label for the forked task | |
334 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
335 | * |
336 | * Returns the new blob or NULL if there's no memory available | |
337 | */ | |
2f823ff8 CS |
338 | static struct task_smack *new_task_smack(struct smack_known *task, |
339 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
340 | { |
341 | struct task_smack *tsp; | |
342 | ||
343 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
344 | if (tsp == NULL) | |
345 | return NULL; | |
346 | ||
347 | tsp->smk_task = task; | |
348 | tsp->smk_forked = forked; | |
349 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 350 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
351 | mutex_init(&tsp->smk_rules_lock); |
352 | ||
353 | return tsp; | |
354 | } | |
355 | ||
356 | /** | |
357 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
358 | * @nhead: new rules header pointer |
359 | * @ohead: old rules header pointer | |
360 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
361 | * |
362 | * Returns 0 on success, -ENOMEM on error | |
363 | */ | |
364 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
365 | gfp_t gfp) | |
366 | { | |
367 | struct smack_rule *nrp; | |
368 | struct smack_rule *orp; | |
369 | int rc = 0; | |
370 | ||
7898e1f8 CS |
371 | list_for_each_entry_rcu(orp, ohead, list) { |
372 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
373 | if (nrp == NULL) { | |
374 | rc = -ENOMEM; | |
375 | break; | |
376 | } | |
377 | *nrp = *orp; | |
378 | list_add_rcu(&nrp->list, nhead); | |
379 | } | |
380 | return rc; | |
381 | } | |
382 | ||
38416e53 ZJ |
383 | /** |
384 | * smk_copy_relabel - copy smk_relabel labels list | |
385 | * @nhead: new rules header pointer | |
386 | * @ohead: old rules header pointer | |
387 | * @gfp: type of the memory for the allocation | |
388 | * | |
389 | * Returns 0 on success, -ENOMEM on error | |
390 | */ | |
391 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
392 | gfp_t gfp) | |
393 | { | |
394 | struct smack_known_list_elem *nklep; | |
395 | struct smack_known_list_elem *oklep; | |
396 | ||
38416e53 ZJ |
397 | list_for_each_entry(oklep, ohead, list) { |
398 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
399 | if (nklep == NULL) { | |
400 | smk_destroy_label_list(nhead); | |
401 | return -ENOMEM; | |
402 | } | |
403 | nklep->smk_label = oklep->smk_label; | |
404 | list_add(&nklep->list, nhead); | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
5663884c LP |
410 | /** |
411 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
412 | * @mode - input mode in form of PTRACE_MODE_* | |
413 | * | |
414 | * Returns a converted MAY_* mode usable by smack rules | |
415 | */ | |
416 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
417 | { | |
3dfb7d8c | 418 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 419 | return MAY_READWRITE; |
3dfb7d8c JH |
420 | if (mode & PTRACE_MODE_READ) |
421 | return MAY_READ; | |
5663884c LP |
422 | |
423 | return 0; | |
424 | } | |
425 | ||
426 | /** | |
427 | * smk_ptrace_rule_check - helper for ptrace access | |
428 | * @tracer: tracer process | |
21c7eae2 | 429 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
430 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
431 | * @func: name of the function that called us, used for audit | |
432 | * | |
433 | * Returns 0 on access granted, -error on error | |
434 | */ | |
21c7eae2 LP |
435 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
436 | struct smack_known *tracee_known, | |
5663884c LP |
437 | unsigned int mode, const char *func) |
438 | { | |
439 | int rc; | |
440 | struct smk_audit_info ad, *saip = NULL; | |
441 | struct task_smack *tsp; | |
21c7eae2 | 442 | struct smack_known *tracer_known; |
dcb569cf | 443 | const struct cred *tracercred; |
5663884c LP |
444 | |
445 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
446 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
447 | smk_ad_setfield_u_tsk(&ad, tracer); | |
448 | saip = &ad; | |
449 | } | |
450 | ||
6d1cff2a | 451 | rcu_read_lock(); |
dcb569cf CS |
452 | tracercred = __task_cred(tracer); |
453 | tsp = tracercred->security; | |
21c7eae2 | 454 | tracer_known = smk_of_task(tsp); |
5663884c | 455 | |
66867818 LP |
456 | if ((mode & PTRACE_MODE_ATTACH) && |
457 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
458 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 459 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
460 | rc = 0; |
461 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
462 | rc = -EACCES; | |
dcb569cf | 463 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
464 | rc = 0; |
465 | else | |
466 | rc = -EACCES; | |
467 | ||
468 | if (saip) | |
21c7eae2 LP |
469 | smack_log(tracer_known->smk_known, |
470 | tracee_known->smk_known, | |
471 | 0, rc, saip); | |
66867818 | 472 | |
6d1cff2a | 473 | rcu_read_unlock(); |
66867818 LP |
474 | return rc; |
475 | } | |
476 | ||
477 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 478 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
479 | |
480 | rcu_read_unlock(); | |
5663884c LP |
481 | return rc; |
482 | } | |
483 | ||
e114e473 CS |
484 | /* |
485 | * LSM hooks. | |
486 | * We he, that is fun! | |
487 | */ | |
488 | ||
489 | /** | |
9e48858f | 490 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 491 | * @ctp: child task pointer |
5663884c | 492 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
493 | * |
494 | * Returns 0 if access is OK, an error code otherwise | |
495 | * | |
5663884c | 496 | * Do the capability checks. |
e114e473 | 497 | */ |
9e48858f | 498 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 499 | { |
2f823ff8 | 500 | struct smack_known *skp; |
e114e473 | 501 | |
6d1cff2a | 502 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 503 | |
b1d9e6b0 | 504 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
505 | } |
506 | ||
507 | /** | |
508 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
509 | * @ptp: parent task pointer | |
510 | * | |
511 | * Returns 0 if access is OK, an error code otherwise | |
512 | * | |
5663884c | 513 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
514 | */ |
515 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
516 | { | |
517 | int rc; | |
2f823ff8 | 518 | struct smack_known *skp; |
5cd9c58f | 519 | |
959e6c7f | 520 | skp = smk_of_task(current_security()); |
ecfcc53f | 521 | |
21c7eae2 | 522 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
523 | return rc; |
524 | } | |
525 | ||
526 | /** | |
527 | * smack_syslog - Smack approval on syslog | |
528 | * @type: message type | |
529 | * | |
e114e473 CS |
530 | * Returns 0 on success, error code otherwise. |
531 | */ | |
12b3052c | 532 | static int smack_syslog(int typefrom_file) |
e114e473 | 533 | { |
12b3052c | 534 | int rc = 0; |
2f823ff8 | 535 | struct smack_known *skp = smk_of_current(); |
e114e473 | 536 | |
1880eff7 | 537 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
538 | return 0; |
539 | ||
24ea1b6e | 540 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
541 | rc = -EACCES; |
542 | ||
543 | return rc; | |
544 | } | |
545 | ||
e114e473 CS |
546 | /* |
547 | * Superblock Hooks. | |
548 | */ | |
549 | ||
550 | /** | |
551 | * smack_sb_alloc_security - allocate a superblock blob | |
552 | * @sb: the superblock getting the blob | |
553 | * | |
554 | * Returns 0 on success or -ENOMEM on error. | |
555 | */ | |
556 | static int smack_sb_alloc_security(struct super_block *sb) | |
557 | { | |
558 | struct superblock_smack *sbsp; | |
559 | ||
560 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
561 | ||
562 | if (sbsp == NULL) | |
563 | return -ENOMEM; | |
564 | ||
21c7eae2 LP |
565 | sbsp->smk_root = &smack_known_floor; |
566 | sbsp->smk_default = &smack_known_floor; | |
567 | sbsp->smk_floor = &smack_known_floor; | |
568 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 569 | /* |
9f50eda2 | 570 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 571 | */ |
e114e473 CS |
572 | sb->s_security = sbsp; |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | /** | |
578 | * smack_sb_free_security - free a superblock blob | |
579 | * @sb: the superblock getting the blob | |
580 | * | |
581 | */ | |
582 | static void smack_sb_free_security(struct super_block *sb) | |
583 | { | |
584 | kfree(sb->s_security); | |
585 | sb->s_security = NULL; | |
586 | } | |
587 | ||
12085b14 AV |
588 | struct smack_mnt_opts { |
589 | const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute; | |
590 | }; | |
e114e473 | 591 | |
204cc0cc AV |
592 | static void smack_free_mnt_opts(void *mnt_opts) |
593 | { | |
12085b14 AV |
594 | struct smack_mnt_opts *opts = mnt_opts; |
595 | kfree(opts->fsdefault); | |
596 | kfree(opts->fsfloor); | |
597 | kfree(opts->fshat); | |
598 | kfree(opts->fsroot); | |
599 | kfree(opts->fstransmute); | |
204cc0cc AV |
600 | kfree(opts); |
601 | } | |
e114e473 | 602 | |
55c0e5bd AV |
603 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
604 | { | |
605 | struct smack_mnt_opts *opts = *mnt_opts; | |
e114e473 | 606 | |
55c0e5bd AV |
607 | if (!opts) { |
608 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
609 | if (!opts) | |
610 | return -ENOMEM; | |
611 | *mnt_opts = opts; | |
e114e473 | 612 | } |
55c0e5bd AV |
613 | if (!s) |
614 | return -ENOMEM; | |
e114e473 | 615 | |
55c0e5bd AV |
616 | switch (token) { |
617 | case Opt_fsdefault: | |
618 | if (opts->fsdefault) | |
619 | goto out_opt_err; | |
620 | opts->fsdefault = s; | |
621 | break; | |
622 | case Opt_fsfloor: | |
623 | if (opts->fsfloor) | |
624 | goto out_opt_err; | |
625 | opts->fsfloor = s; | |
626 | break; | |
627 | case Opt_fshat: | |
628 | if (opts->fshat) | |
629 | goto out_opt_err; | |
630 | opts->fshat = s; | |
631 | break; | |
632 | case Opt_fsroot: | |
633 | if (opts->fsroot) | |
634 | goto out_opt_err; | |
635 | opts->fsroot = s; | |
636 | break; | |
637 | case Opt_fstransmute: | |
638 | if (opts->fstransmute) | |
639 | goto out_opt_err; | |
640 | opts->fstransmute = s; | |
641 | break; | |
642 | } | |
e114e473 | 643 | return 0; |
55c0e5bd AV |
644 | |
645 | out_opt_err: | |
646 | pr_warn("Smack: duplicate mount options\n"); | |
647 | return -EINVAL; | |
e114e473 CS |
648 | } |
649 | ||
0b52075e AV |
650 | /** |
651 | * smack_fs_context_dup - Duplicate the security data on fs_context duplication | |
652 | * @fc: The new filesystem context. | |
653 | * @src_fc: The source filesystem context being duplicated. | |
654 | * | |
655 | * Returns 0 on success or -ENOMEM on error. | |
656 | */ | |
657 | static int smack_fs_context_dup(struct fs_context *fc, | |
658 | struct fs_context *src_fc) | |
659 | { | |
660 | struct smack_mnt_opts *dst, *src = src_fc->security; | |
661 | ||
662 | if (!src) | |
663 | return 0; | |
664 | ||
665 | fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
666 | if (!fc->security) | |
667 | return -ENOMEM; | |
668 | dst = fc->security; | |
669 | ||
670 | if (src->fsdefault) { | |
671 | dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL); | |
672 | if (!dst->fsdefault) | |
673 | return -ENOMEM; | |
674 | } | |
675 | if (src->fsfloor) { | |
676 | dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL); | |
677 | if (!dst->fsfloor) | |
678 | return -ENOMEM; | |
679 | } | |
680 | if (src->fshat) { | |
681 | dst->fshat = kstrdup(src->fshat, GFP_KERNEL); | |
682 | if (!dst->fshat) | |
683 | return -ENOMEM; | |
684 | } | |
685 | if (src->fsroot) { | |
686 | dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL); | |
687 | if (!dst->fsroot) | |
688 | return -ENOMEM; | |
689 | } | |
690 | if (src->fstransmute) { | |
691 | dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL); | |
692 | if (!dst->fstransmute) | |
693 | return -ENOMEM; | |
694 | } | |
695 | return 0; | |
696 | } | |
697 | ||
2febd254 DH |
698 | static const struct fs_parameter_spec smack_param_specs[] = { |
699 | fsparam_string("fsdefault", Opt_fsdefault), | |
700 | fsparam_string("fsfloor", Opt_fsfloor), | |
701 | fsparam_string("fshat", Opt_fshat), | |
702 | fsparam_string("fsroot", Opt_fsroot), | |
703 | fsparam_string("fstransmute", Opt_fstransmute), | |
704 | {} | |
705 | }; | |
706 | ||
707 | static const struct fs_parameter_description smack_fs_parameters = { | |
708 | .name = "smack", | |
709 | .specs = smack_param_specs, | |
710 | }; | |
711 | ||
712 | /** | |
713 | * smack_fs_context_parse_param - Parse a single mount parameter | |
714 | * @fc: The new filesystem context being constructed. | |
715 | * @param: The parameter. | |
716 | * | |
717 | * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on | |
718 | * error. | |
719 | */ | |
720 | static int smack_fs_context_parse_param(struct fs_context *fc, | |
721 | struct fs_parameter *param) | |
722 | { | |
723 | struct fs_parse_result result; | |
724 | int opt, rc; | |
725 | ||
726 | opt = fs_parse(fc, &smack_fs_parameters, param, &result); | |
727 | if (opt < 0) | |
728 | return opt; | |
729 | ||
730 | rc = smack_add_opt(opt, param->string, &fc->security); | |
731 | if (!rc) | |
732 | param->string = NULL; | |
733 | return rc; | |
734 | } | |
735 | ||
d2497e12 | 736 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
3bf2789c | 737 | { |
d2497e12 AV |
738 | char *from = options, *to = options; |
739 | bool first = true; | |
3bf2789c | 740 | |
c3300aaf AV |
741 | while (1) { |
742 | char *next = strchr(from, ','); | |
743 | int token, len, rc; | |
744 | char *arg = NULL; | |
3bf2789c | 745 | |
c3300aaf AV |
746 | if (next) |
747 | len = next - from; | |
748 | else | |
749 | len = strlen(from); | |
3bf2789c | 750 | |
c3300aaf | 751 | token = match_opt_prefix(from, len, &arg); |
d2497e12 AV |
752 | if (token != Opt_error) { |
753 | arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL); | |
754 | rc = smack_add_opt(token, arg, mnt_opts); | |
755 | if (unlikely(rc)) { | |
756 | kfree(arg); | |
757 | if (*mnt_opts) | |
758 | smack_free_mnt_opts(*mnt_opts); | |
759 | *mnt_opts = NULL; | |
760 | return rc; | |
761 | } | |
762 | } else { | |
763 | if (!first) { // copy with preceding comma | |
764 | from--; | |
765 | len++; | |
766 | } | |
767 | if (to != from) | |
768 | memmove(to, from, len); | |
769 | to += len; | |
770 | first = false; | |
3bf2789c | 771 | } |
c3300aaf AV |
772 | if (!from[len]) |
773 | break; | |
774 | from += len + 1; | |
3bf2789c | 775 | } |
d2497e12 | 776 | *to = '\0'; |
3bf2789c | 777 | return 0; |
3bf2789c VT |
778 | } |
779 | ||
780 | /** | |
781 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 782 | * @sb: the file system superblock |
3bf2789c VT |
783 | * @opts: Smack mount options |
784 | * @kern_flags: mount option from kernel space or user space | |
785 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
786 | * |
787 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
788 | * |
789 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
790 | * labels. | |
e114e473 | 791 | */ |
3bf2789c | 792 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 793 | void *mnt_opts, |
3bf2789c VT |
794 | unsigned long kern_flags, |
795 | unsigned long *set_kern_flags) | |
e114e473 CS |
796 | { |
797 | struct dentry *root = sb->s_root; | |
c6f493d6 | 798 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
799 | struct superblock_smack *sp = sb->s_security; |
800 | struct inode_smack *isp; | |
24ea1b6e | 801 | struct smack_known *skp; |
12085b14 AV |
802 | struct smack_mnt_opts *opts = mnt_opts; |
803 | bool transmute = false; | |
e114e473 | 804 | |
9f50eda2 | 805 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 806 | return 0; |
eb982cb4 | 807 | |
2097f599 HS |
808 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
809 | /* | |
810 | * Unprivileged mounts don't get to specify Smack values. | |
811 | */ | |
12085b14 | 812 | if (opts) |
2097f599 HS |
813 | return -EPERM; |
814 | /* | |
815 | * Unprivileged mounts get root and default from the caller. | |
816 | */ | |
817 | skp = smk_of_current(); | |
818 | sp->smk_root = skp; | |
819 | sp->smk_default = skp; | |
820 | /* | |
821 | * For a handful of fs types with no user-controlled | |
822 | * backing store it's okay to trust security labels | |
823 | * in the filesystem. The rest are untrusted. | |
824 | */ | |
825 | if (sb->s_user_ns != &init_user_ns && | |
826 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
827 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 828 | transmute = true; |
2097f599 HS |
829 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
830 | } | |
831 | } | |
832 | ||
9f50eda2 | 833 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 834 | |
12085b14 AV |
835 | if (opts) { |
836 | if (opts->fsdefault) { | |
837 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
838 | if (IS_ERR(skp)) |
839 | return PTR_ERR(skp); | |
3bf2789c | 840 | sp->smk_default = skp; |
12085b14 AV |
841 | } |
842 | if (opts->fsfloor) { | |
843 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
844 | if (IS_ERR(skp)) |
845 | return PTR_ERR(skp); | |
846 | sp->smk_floor = skp; | |
12085b14 AV |
847 | } |
848 | if (opts->fshat) { | |
849 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
850 | if (IS_ERR(skp)) |
851 | return PTR_ERR(skp); | |
3bf2789c | 852 | sp->smk_hat = skp; |
12085b14 AV |
853 | } |
854 | if (opts->fsroot) { | |
855 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
856 | if (IS_ERR(skp)) |
857 | return PTR_ERR(skp); | |
858 | sp->smk_root = skp; | |
12085b14 AV |
859 | } |
860 | if (opts->fstransmute) { | |
861 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
862 | if (IS_ERR(skp)) |
863 | return PTR_ERR(skp); | |
864 | sp->smk_root = skp; | |
12085b14 | 865 | transmute = true; |
e114e473 CS |
866 | } |
867 | } | |
868 | ||
869 | /* | |
870 | * Initialize the root inode. | |
871 | */ | |
872 | isp = inode->i_security; | |
55dfc5da JB |
873 | if (isp == NULL) { |
874 | isp = new_inode_smack(sp->smk_root); | |
875 | if (isp == NULL) | |
876 | return -ENOMEM; | |
877 | inode->i_security = isp; | |
e830b394 | 878 | } else |
e114e473 CS |
879 | isp->smk_inode = sp->smk_root; |
880 | ||
e830b394 CS |
881 | if (transmute) |
882 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
883 | ||
e114e473 CS |
884 | return 0; |
885 | } | |
886 | ||
887 | /** | |
888 | * smack_sb_statfs - Smack check on statfs | |
889 | * @dentry: identifies the file system in question | |
890 | * | |
891 | * Returns 0 if current can read the floor of the filesystem, | |
892 | * and error code otherwise | |
893 | */ | |
894 | static int smack_sb_statfs(struct dentry *dentry) | |
895 | { | |
896 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
897 | int rc; |
898 | struct smk_audit_info ad; | |
899 | ||
a269434d | 900 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 901 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 902 | |
ecfcc53f | 903 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 904 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 905 | return rc; |
e114e473 CS |
906 | } |
907 | ||
676dac4b CS |
908 | /* |
909 | * BPRM hooks | |
910 | */ | |
911 | ||
ce8a4321 CS |
912 | /** |
913 | * smack_bprm_set_creds - set creds for exec | |
914 | * @bprm: the exec information | |
915 | * | |
5663884c | 916 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 917 | */ |
676dac4b CS |
918 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
919 | { | |
496ad9aa | 920 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 921 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 922 | struct inode_smack *isp; |
809c02e0 | 923 | struct superblock_smack *sbsp; |
676dac4b CS |
924 | int rc; |
925 | ||
ddb4a144 | 926 | if (bprm->called_set_creds) |
676dac4b CS |
927 | return 0; |
928 | ||
84088ba2 JS |
929 | isp = inode->i_security; |
930 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
931 | return 0; |
932 | ||
809c02e0 SF |
933 | sbsp = inode->i_sb->s_security; |
934 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && | |
935 | isp->smk_task != sbsp->smk_root) | |
936 | return 0; | |
937 | ||
9227dd2a | 938 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
939 | struct task_struct *tracer; |
940 | rc = 0; | |
941 | ||
942 | rcu_read_lock(); | |
943 | tracer = ptrace_parent(current); | |
944 | if (likely(tracer != NULL)) | |
945 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 946 | isp->smk_task, |
5663884c LP |
947 | PTRACE_MODE_ATTACH, |
948 | __func__); | |
949 | rcu_read_unlock(); | |
950 | ||
951 | if (rc != 0) | |
952 | return rc; | |
953 | } else if (bprm->unsafe) | |
84088ba2 | 954 | return -EPERM; |
676dac4b | 955 | |
84088ba2 JS |
956 | bsp->smk_task = isp->smk_task; |
957 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 958 | |
ccbb6e10 KC |
959 | /* Decide if this is a secure exec. */ |
960 | if (bsp->smk_task != bsp->smk_forked) | |
961 | bprm->secureexec = 1; | |
962 | ||
84088ba2 JS |
963 | return 0; |
964 | } | |
676dac4b | 965 | |
e114e473 CS |
966 | /* |
967 | * Inode hooks | |
968 | */ | |
969 | ||
970 | /** | |
971 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 972 | * @inode: the inode in need of a blob |
e114e473 CS |
973 | * |
974 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
975 | */ | |
976 | static int smack_inode_alloc_security(struct inode *inode) | |
977 | { | |
2f823ff8 CS |
978 | struct smack_known *skp = smk_of_current(); |
979 | ||
21c7eae2 | 980 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
981 | if (inode->i_security == NULL) |
982 | return -ENOMEM; | |
983 | return 0; | |
984 | } | |
985 | ||
986 | /** | |
3d4f673a HS |
987 | * smack_inode_free_rcu - Free inode_smack blob from cache |
988 | * @head: the rcu_head for getting inode_smack pointer | |
989 | * | |
990 | * Call back function called from call_rcu() to free | |
991 | * the i_security blob pointer in inode | |
992 | */ | |
993 | static void smack_inode_free_rcu(struct rcu_head *head) | |
994 | { | |
995 | struct inode_smack *issp; | |
996 | ||
997 | issp = container_of(head, struct inode_smack, smk_rcu); | |
998 | kmem_cache_free(smack_inode_cache, issp); | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * smack_inode_free_security - free an inode blob using call_rcu() | |
251a2a95 | 1003 | * @inode: the inode with a blob |
e114e473 | 1004 | * |
3d4f673a | 1005 | * Clears the blob pointer in inode using RCU |
e114e473 CS |
1006 | */ |
1007 | static void smack_inode_free_security(struct inode *inode) | |
1008 | { | |
3d4f673a HS |
1009 | struct inode_smack *issp = inode->i_security; |
1010 | ||
1011 | /* | |
1012 | * The inode may still be referenced in a path walk and | |
1013 | * a call to smack_inode_permission() can be made | |
1014 | * after smack_inode_free_security() is called. | |
1015 | * To avoid race condition free the i_security via RCU | |
1016 | * and leave the current inode->i_security pointer intact. | |
1017 | * The inode will be freed after the RCU grace period too. | |
1018 | */ | |
1019 | call_rcu(&issp->smk_rcu, smack_inode_free_rcu); | |
e114e473 CS |
1020 | } |
1021 | ||
1022 | /** | |
1023 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
1024 | * @inode: the newly created inode |
1025 | * @dir: containing directory object | |
2a7dba39 | 1026 | * @qstr: unused |
e114e473 CS |
1027 | * @name: where to put the attribute name |
1028 | * @value: where to put the attribute value | |
1029 | * @len: where to put the length of the attribute | |
1030 | * | |
1031 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
1032 | */ | |
1033 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 1034 | const struct qstr *qstr, const char **name, |
2a7dba39 | 1035 | void **value, size_t *len) |
e114e473 | 1036 | { |
2267b13a | 1037 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 1038 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
1039 | struct smack_known *isp = smk_of_inode(inode); |
1040 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 1041 | int may; |
e114e473 | 1042 | |
9548906b TH |
1043 | if (name) |
1044 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1045 | |
68390ccf | 1046 | if (value && len) { |
7898e1f8 | 1047 | rcu_read_lock(); |
21c7eae2 LP |
1048 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1049 | &skp->smk_rules); | |
7898e1f8 | 1050 | rcu_read_unlock(); |
5c6d1125 JS |
1051 | |
1052 | /* | |
1053 | * If the access rule allows transmutation and | |
1054 | * the directory requests transmutation then | |
1055 | * by all means transmute. | |
2267b13a | 1056 | * Mark the inode as changed. |
5c6d1125 | 1057 | */ |
7898e1f8 | 1058 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1059 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1060 | isp = dsp; |
2267b13a CS |
1061 | issp->smk_flags |= SMK_INODE_CHANGED; |
1062 | } | |
5c6d1125 | 1063 | |
21c7eae2 | 1064 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1065 | if (*value == NULL) |
1066 | return -ENOMEM; | |
e114e473 | 1067 | |
21c7eae2 | 1068 | *len = strlen(isp->smk_known); |
68390ccf | 1069 | } |
e114e473 CS |
1070 | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * smack_inode_link - Smack check on link | |
1076 | * @old_dentry: the existing object | |
1077 | * @dir: unused | |
1078 | * @new_dentry: the new object | |
1079 | * | |
1080 | * Returns 0 if access is permitted, an error code otherwise | |
1081 | */ | |
1082 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1083 | struct dentry *new_dentry) | |
1084 | { | |
21c7eae2 | 1085 | struct smack_known *isp; |
ecfcc53f EB |
1086 | struct smk_audit_info ad; |
1087 | int rc; | |
1088 | ||
a269434d | 1089 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1090 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1091 | |
c6f493d6 | 1092 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1093 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1094 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1095 | |
8802565b | 1096 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1097 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1098 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1099 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1100 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1101 | } |
1102 | ||
1103 | return rc; | |
1104 | } | |
1105 | ||
1106 | /** | |
1107 | * smack_inode_unlink - Smack check on inode deletion | |
1108 | * @dir: containing directory object | |
1109 | * @dentry: file to unlink | |
1110 | * | |
1111 | * Returns 0 if current can write the containing directory | |
1112 | * and the object, error code otherwise | |
1113 | */ | |
1114 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1115 | { | |
c6f493d6 | 1116 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1117 | struct smk_audit_info ad; |
e114e473 CS |
1118 | int rc; |
1119 | ||
a269434d | 1120 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1121 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1122 | ||
e114e473 CS |
1123 | /* |
1124 | * You need write access to the thing you're unlinking | |
1125 | */ | |
ecfcc53f | 1126 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1127 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1128 | if (rc == 0) { |
e114e473 CS |
1129 | /* |
1130 | * You also need write access to the containing directory | |
1131 | */ | |
cdb56b60 | 1132 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1133 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1134 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1135 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1136 | } |
e114e473 CS |
1137 | return rc; |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * smack_inode_rmdir - Smack check on directory deletion | |
1142 | * @dir: containing directory object | |
1143 | * @dentry: directory to unlink | |
1144 | * | |
1145 | * Returns 0 if current can write the containing directory | |
1146 | * and the directory, error code otherwise | |
1147 | */ | |
1148 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1149 | { | |
ecfcc53f | 1150 | struct smk_audit_info ad; |
e114e473 CS |
1151 | int rc; |
1152 | ||
a269434d | 1153 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1154 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1155 | ||
e114e473 CS |
1156 | /* |
1157 | * You need write access to the thing you're removing | |
1158 | */ | |
c6f493d6 DH |
1159 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1160 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1161 | if (rc == 0) { |
e114e473 CS |
1162 | /* |
1163 | * You also need write access to the containing directory | |
1164 | */ | |
cdb56b60 | 1165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1166 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1167 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1168 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1169 | } |
e114e473 CS |
1170 | |
1171 | return rc; | |
1172 | } | |
1173 | ||
1174 | /** | |
1175 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1176 | * @old_inode: unused |
1177 | * @old_dentry: the old object | |
1178 | * @new_inode: unused | |
1179 | * @new_dentry: the new object | |
e114e473 CS |
1180 | * |
1181 | * Read and write access is required on both the old and | |
1182 | * new directories. | |
1183 | * | |
1184 | * Returns 0 if access is permitted, an error code otherwise | |
1185 | */ | |
1186 | static int smack_inode_rename(struct inode *old_inode, | |
1187 | struct dentry *old_dentry, | |
1188 | struct inode *new_inode, | |
1189 | struct dentry *new_dentry) | |
1190 | { | |
1191 | int rc; | |
21c7eae2 | 1192 | struct smack_known *isp; |
ecfcc53f EB |
1193 | struct smk_audit_info ad; |
1194 | ||
a269434d | 1195 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1196 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1197 | |
c6f493d6 | 1198 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1199 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1200 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1201 | |
8802565b | 1202 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1203 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1204 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1205 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1206 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1207 | } |
e114e473 CS |
1208 | return rc; |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * smack_inode_permission - Smack version of permission() | |
1213 | * @inode: the inode in question | |
1214 | * @mask: the access requested | |
e114e473 CS |
1215 | * |
1216 | * This is the important Smack hook. | |
1217 | * | |
1218 | * Returns 0 if access is permitted, -EACCES otherwise | |
1219 | */ | |
e74f71eb | 1220 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1221 | { |
9f50eda2 | 1222 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1223 | struct smk_audit_info ad; |
e74f71eb | 1224 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1225 | int rc; |
d09ca739 EP |
1226 | |
1227 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1228 | /* |
1229 | * No permission to check. Existence test. Yup, it's there. | |
1230 | */ | |
1231 | if (mask == 0) | |
1232 | return 0; | |
8c9e80ed | 1233 | |
9f50eda2 SF |
1234 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1235 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1236 | return -EACCES; | |
1237 | } | |
1238 | ||
8c9e80ed | 1239 | /* May be droppable after audit */ |
e74f71eb | 1240 | if (no_block) |
8c9e80ed | 1241 | return -ECHILD; |
f48b7399 | 1242 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1243 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1244 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1245 | rc = smk_bu_inode(inode, mask, rc); | |
1246 | return rc; | |
e114e473 CS |
1247 | } |
1248 | ||
1249 | /** | |
1250 | * smack_inode_setattr - Smack check for setting attributes | |
1251 | * @dentry: the object | |
1252 | * @iattr: for the force flag | |
1253 | * | |
1254 | * Returns 0 if access is permitted, an error code otherwise | |
1255 | */ | |
1256 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1257 | { | |
ecfcc53f | 1258 | struct smk_audit_info ad; |
d166c802 CS |
1259 | int rc; |
1260 | ||
e114e473 CS |
1261 | /* |
1262 | * Need to allow for clearing the setuid bit. | |
1263 | */ | |
1264 | if (iattr->ia_valid & ATTR_FORCE) | |
1265 | return 0; | |
a269434d | 1266 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1267 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1268 | |
c6f493d6 DH |
1269 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1270 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1271 | return rc; |
e114e473 CS |
1272 | } |
1273 | ||
1274 | /** | |
1275 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1276 | * @mnt: vfsmount of the object |
e114e473 CS |
1277 | * @dentry: the object |
1278 | * | |
1279 | * Returns 0 if access is permitted, an error code otherwise | |
1280 | */ | |
3f7036a0 | 1281 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1282 | { |
ecfcc53f | 1283 | struct smk_audit_info ad; |
c6f493d6 | 1284 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1285 | int rc; |
ecfcc53f | 1286 | |
f48b7399 | 1287 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1288 | smk_ad_setfield_u_fs_path(&ad, *path); |
1289 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1290 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1291 | return rc; |
e114e473 CS |
1292 | } |
1293 | ||
1294 | /** | |
1295 | * smack_inode_setxattr - Smack check for setting xattrs | |
1296 | * @dentry: the object | |
1297 | * @name: name of the attribute | |
e95ef49b LP |
1298 | * @value: value of the attribute |
1299 | * @size: size of the value | |
e114e473 CS |
1300 | * @flags: unused |
1301 | * | |
1302 | * This protects the Smack attribute explicitly. | |
1303 | * | |
1304 | * Returns 0 if access is permitted, an error code otherwise | |
1305 | */ | |
8f0cfa52 DH |
1306 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1307 | const void *value, size_t size, int flags) | |
e114e473 | 1308 | { |
ecfcc53f | 1309 | struct smk_audit_info ad; |
19760ad0 CS |
1310 | struct smack_known *skp; |
1311 | int check_priv = 0; | |
1312 | int check_import = 0; | |
1313 | int check_star = 0; | |
bcdca225 | 1314 | int rc = 0; |
e114e473 | 1315 | |
19760ad0 CS |
1316 | /* |
1317 | * Check label validity here so import won't fail in post_setxattr | |
1318 | */ | |
bcdca225 CS |
1319 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1320 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1321 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1322 | check_priv = 1; | |
1323 | check_import = 1; | |
1324 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1325 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1326 | check_priv = 1; | |
1327 | check_import = 1; | |
1328 | check_star = 1; | |
5c6d1125 | 1329 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1330 | check_priv = 1; |
5c6d1125 JS |
1331 | if (size != TRANS_TRUE_SIZE || |
1332 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1333 | rc = -EINVAL; | |
bcdca225 CS |
1334 | } else |
1335 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1336 | ||
19760ad0 CS |
1337 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1338 | rc = -EPERM; | |
1339 | ||
1340 | if (rc == 0 && check_import) { | |
b862e561 | 1341 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1342 | if (IS_ERR(skp)) |
1343 | rc = PTR_ERR(skp); | |
1344 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1345 | (skp == &smack_known_star || skp == &smack_known_web))) |
1346 | rc = -EINVAL; | |
1347 | } | |
1348 | ||
a269434d | 1349 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1350 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1351 | ||
d166c802 | 1352 | if (rc == 0) { |
c6f493d6 DH |
1353 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1354 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1355 | } |
bcdca225 CS |
1356 | |
1357 | return rc; | |
e114e473 CS |
1358 | } |
1359 | ||
1360 | /** | |
1361 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1362 | * @dentry: object | |
1363 | * @name: attribute name | |
1364 | * @value: attribute value | |
1365 | * @size: attribute size | |
1366 | * @flags: unused | |
1367 | * | |
1368 | * Set the pointer in the inode blob to the entry found | |
1369 | * in the master label list. | |
1370 | */ | |
8f0cfa52 DH |
1371 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1372 | const void *value, size_t size, int flags) | |
e114e473 | 1373 | { |
2f823ff8 | 1374 | struct smack_known *skp; |
c6f493d6 | 1375 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1376 | |
2f823ff8 CS |
1377 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1378 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1379 | return; | |
1380 | } | |
1381 | ||
676dac4b | 1382 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1383 | skp = smk_import_entry(value, size); |
e774ad68 | 1384 | if (!IS_ERR(skp)) |
21c7eae2 | 1385 | isp->smk_inode = skp; |
5c6d1125 | 1386 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1387 | skp = smk_import_entry(value, size); |
e774ad68 | 1388 | if (!IS_ERR(skp)) |
2f823ff8 | 1389 | isp->smk_task = skp; |
7898e1f8 | 1390 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1391 | skp = smk_import_entry(value, size); |
e774ad68 | 1392 | if (!IS_ERR(skp)) |
2f823ff8 | 1393 | isp->smk_mmap = skp; |
2f823ff8 | 1394 | } |
e114e473 CS |
1395 | |
1396 | return; | |
1397 | } | |
1398 | ||
ce8a4321 | 1399 | /** |
e114e473 CS |
1400 | * smack_inode_getxattr - Smack check on getxattr |
1401 | * @dentry: the object | |
1402 | * @name: unused | |
1403 | * | |
1404 | * Returns 0 if access is permitted, an error code otherwise | |
1405 | */ | |
8f0cfa52 | 1406 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1407 | { |
ecfcc53f | 1408 | struct smk_audit_info ad; |
d166c802 | 1409 | int rc; |
ecfcc53f | 1410 | |
a269434d | 1411 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1412 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1413 | ||
c6f493d6 DH |
1414 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1415 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1416 | return rc; |
e114e473 CS |
1417 | } |
1418 | ||
ce8a4321 | 1419 | /** |
e114e473 CS |
1420 | * smack_inode_removexattr - Smack check on removexattr |
1421 | * @dentry: the object | |
1422 | * @name: name of the attribute | |
1423 | * | |
1424 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1425 | * | |
1426 | * Returns 0 if access is permitted, an error code otherwise | |
1427 | */ | |
8f0cfa52 | 1428 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1429 | { |
676dac4b | 1430 | struct inode_smack *isp; |
ecfcc53f | 1431 | struct smk_audit_info ad; |
bcdca225 | 1432 | int rc = 0; |
e114e473 | 1433 | |
bcdca225 CS |
1434 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1435 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1436 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1437 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1438 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1439 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1440 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1441 | rc = -EPERM; |
1442 | } else | |
1443 | rc = cap_inode_removexattr(dentry, name); | |
1444 | ||
f59bdfba CS |
1445 | if (rc != 0) |
1446 | return rc; | |
1447 | ||
a269434d | 1448 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1449 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1450 | |
c6f493d6 DH |
1451 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1452 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1453 | if (rc != 0) |
1454 | return rc; | |
1455 | ||
c6f493d6 | 1456 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1457 | /* |
1458 | * Don't do anything special for these. | |
1459 | * XATTR_NAME_SMACKIPIN | |
1460 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1461 | */ |
8012495e | 1462 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1463 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1464 | struct superblock_smack *sbsp = sbp->s_security; |
1465 | ||
1466 | isp->smk_inode = sbsp->smk_default; | |
1467 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1468 | isp->smk_task = NULL; |
f59bdfba | 1469 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1470 | isp->smk_mmap = NULL; |
f59bdfba CS |
1471 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1472 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1473 | |
f59bdfba | 1474 | return 0; |
e114e473 CS |
1475 | } |
1476 | ||
1477 | /** | |
1478 | * smack_inode_getsecurity - get smack xattrs | |
1479 | * @inode: the object | |
1480 | * @name: attribute name | |
1481 | * @buffer: where to put the result | |
57e7ba04 | 1482 | * @alloc: duplicate memory |
e114e473 CS |
1483 | * |
1484 | * Returns the size of the attribute or an error code | |
1485 | */ | |
ea861dfd | 1486 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1487 | const char *name, void **buffer, |
1488 | bool alloc) | |
1489 | { | |
1490 | struct socket_smack *ssp; | |
1491 | struct socket *sock; | |
1492 | struct super_block *sbp; | |
1493 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1494 | struct smack_known *isp; |
e114e473 | 1495 | |
57e7ba04 | 1496 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1497 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1498 | else { |
1499 | /* | |
1500 | * The rest of the Smack xattrs are only on sockets. | |
1501 | */ | |
1502 | sbp = ip->i_sb; | |
1503 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1504 | return -EOPNOTSUPP; | |
e114e473 | 1505 | |
57e7ba04 CS |
1506 | sock = SOCKET_I(ip); |
1507 | if (sock == NULL || sock->sk == NULL) | |
1508 | return -EOPNOTSUPP; | |
e114e473 | 1509 | |
57e7ba04 | 1510 | ssp = sock->sk->sk_security; |
e114e473 | 1511 | |
57e7ba04 CS |
1512 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1513 | isp = ssp->smk_in; | |
1514 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1515 | isp = ssp->smk_out; | |
1516 | else | |
1517 | return -EOPNOTSUPP; | |
1518 | } | |
e114e473 | 1519 | |
57e7ba04 CS |
1520 | if (alloc) { |
1521 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1522 | if (*buffer == NULL) | |
1523 | return -ENOMEM; | |
e114e473 CS |
1524 | } |
1525 | ||
57e7ba04 | 1526 | return strlen(isp->smk_known); |
e114e473 CS |
1527 | } |
1528 | ||
1529 | ||
1530 | /** | |
1531 | * smack_inode_listsecurity - list the Smack attributes | |
1532 | * @inode: the object | |
1533 | * @buffer: where they go | |
1534 | * @buffer_size: size of buffer | |
e114e473 CS |
1535 | */ |
1536 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1537 | size_t buffer_size) | |
1538 | { | |
fd5c9d23 | 1539 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1540 | |
fd5c9d23 | 1541 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1542 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1543 | |
1544 | return len; | |
e114e473 CS |
1545 | } |
1546 | ||
d20bdda6 AD |
1547 | /** |
1548 | * smack_inode_getsecid - Extract inode's security id | |
1549 | * @inode: inode to extract the info from | |
1550 | * @secid: where result will be saved | |
1551 | */ | |
d6335d77 | 1552 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1553 | { |
0f8983cf | 1554 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1555 | |
0f8983cf | 1556 | *secid = skp->smk_secid; |
d20bdda6 AD |
1557 | } |
1558 | ||
e114e473 CS |
1559 | /* |
1560 | * File Hooks | |
1561 | */ | |
1562 | ||
491a0b08 CS |
1563 | /* |
1564 | * There is no smack_file_permission hook | |
e114e473 CS |
1565 | * |
1566 | * Should access checks be done on each read or write? | |
1567 | * UNICOS and SELinux say yes. | |
1568 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1569 | * | |
1570 | * I'll say no for now. Smack does not do the frequent | |
1571 | * label changing that SELinux does. | |
1572 | */ | |
e114e473 CS |
1573 | |
1574 | /** | |
1575 | * smack_file_alloc_security - assign a file security blob | |
1576 | * @file: the object | |
1577 | * | |
1578 | * The security blob for a file is a pointer to the master | |
1579 | * label list, so no allocation is done. | |
1580 | * | |
5e7270a6 CS |
1581 | * f_security is the owner security information. It |
1582 | * isn't used on file access checks, it's for send_sigio. | |
1583 | * | |
e114e473 CS |
1584 | * Returns 0 |
1585 | */ | |
1586 | static int smack_file_alloc_security(struct file *file) | |
1587 | { | |
2f823ff8 CS |
1588 | struct smack_known *skp = smk_of_current(); |
1589 | ||
21c7eae2 | 1590 | file->f_security = skp; |
e114e473 CS |
1591 | return 0; |
1592 | } | |
1593 | ||
1594 | /** | |
1595 | * smack_file_free_security - clear a file security blob | |
1596 | * @file: the object | |
1597 | * | |
1598 | * The security blob for a file is a pointer to the master | |
1599 | * label list, so no memory is freed. | |
1600 | */ | |
1601 | static void smack_file_free_security(struct file *file) | |
1602 | { | |
1603 | file->f_security = NULL; | |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * smack_file_ioctl - Smack check on ioctls | |
1608 | * @file: the object | |
1609 | * @cmd: what to do | |
1610 | * @arg: unused | |
1611 | * | |
1612 | * Relies heavily on the correct use of the ioctl command conventions. | |
1613 | * | |
1614 | * Returns 0 if allowed, error code otherwise | |
1615 | */ | |
1616 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1617 | unsigned long arg) | |
1618 | { | |
1619 | int rc = 0; | |
ecfcc53f | 1620 | struct smk_audit_info ad; |
5e7270a6 | 1621 | struct inode *inode = file_inode(file); |
ecfcc53f | 1622 | |
83a1e53f SWK |
1623 | if (unlikely(IS_PRIVATE(inode))) |
1624 | return 0; | |
1625 | ||
f48b7399 | 1626 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1627 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1628 | |
d166c802 | 1629 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1630 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1631 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1632 | } | |
e114e473 | 1633 | |
d166c802 | 1634 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1635 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1636 | rc = smk_bu_file(file, MAY_READ, rc); |
1637 | } | |
e114e473 CS |
1638 | |
1639 | return rc; | |
1640 | } | |
1641 | ||
1642 | /** | |
1643 | * smack_file_lock - Smack check on file locking | |
1644 | * @file: the object | |
251a2a95 | 1645 | * @cmd: unused |
e114e473 | 1646 | * |
c0ab6e56 | 1647 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1648 | */ |
1649 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1650 | { | |
ecfcc53f | 1651 | struct smk_audit_info ad; |
d166c802 | 1652 | int rc; |
5e7270a6 | 1653 | struct inode *inode = file_inode(file); |
ecfcc53f | 1654 | |
83a1e53f SWK |
1655 | if (unlikely(IS_PRIVATE(inode))) |
1656 | return 0; | |
1657 | ||
92f42509 EP |
1658 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1659 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1660 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1661 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1662 | return rc; | |
e114e473 CS |
1663 | } |
1664 | ||
1665 | /** | |
1666 | * smack_file_fcntl - Smack check on fcntl | |
1667 | * @file: the object | |
1668 | * @cmd: what action to check | |
1669 | * @arg: unused | |
1670 | * | |
531f1d45 CS |
1671 | * Generally these operations are harmless. |
1672 | * File locking operations present an obvious mechanism | |
1673 | * for passing information, so they require write access. | |
1674 | * | |
e114e473 CS |
1675 | * Returns 0 if current has access, error code otherwise |
1676 | */ | |
1677 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1678 | unsigned long arg) | |
1679 | { | |
ecfcc53f | 1680 | struct smk_audit_info ad; |
531f1d45 | 1681 | int rc = 0; |
5e7270a6 | 1682 | struct inode *inode = file_inode(file); |
ecfcc53f | 1683 | |
83a1e53f SWK |
1684 | if (unlikely(IS_PRIVATE(inode))) |
1685 | return 0; | |
1686 | ||
e114e473 | 1687 | switch (cmd) { |
e114e473 | 1688 | case F_GETLK: |
c0ab6e56 | 1689 | break; |
e114e473 CS |
1690 | case F_SETLK: |
1691 | case F_SETLKW: | |
c0ab6e56 CS |
1692 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1693 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1694 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1695 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1696 | break; |
e114e473 CS |
1697 | case F_SETOWN: |
1698 | case F_SETSIG: | |
531f1d45 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_WRITE, &ad); |
d166c802 | 1702 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1703 | break; |
1704 | default: | |
531f1d45 | 1705 | break; |
e114e473 CS |
1706 | } |
1707 | ||
1708 | return rc; | |
1709 | } | |
1710 | ||
7898e1f8 | 1711 | /** |
e5467859 | 1712 | * smack_mmap_file : |
7898e1f8 CS |
1713 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1714 | * if mapping anonymous memory. | |
1715 | * @file contains the file structure for file to map (may be NULL). | |
1716 | * @reqprot contains the protection requested by the application. | |
1717 | * @prot contains the protection that will be applied by the kernel. | |
1718 | * @flags contains the operational flags. | |
1719 | * Return 0 if permission is granted. | |
1720 | */ | |
e5467859 | 1721 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1722 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1723 | unsigned long flags) |
7898e1f8 | 1724 | { |
272cd7a8 | 1725 | struct smack_known *skp; |
2f823ff8 | 1726 | struct smack_known *mkp; |
7898e1f8 CS |
1727 | struct smack_rule *srp; |
1728 | struct task_smack *tsp; | |
21c7eae2 | 1729 | struct smack_known *okp; |
7898e1f8 | 1730 | struct inode_smack *isp; |
809c02e0 | 1731 | struct superblock_smack *sbsp; |
0e0a070d CS |
1732 | int may; |
1733 | int mmay; | |
1734 | int tmay; | |
7898e1f8 CS |
1735 | int rc; |
1736 | ||
496ad9aa | 1737 | if (file == NULL) |
7898e1f8 CS |
1738 | return 0; |
1739 | ||
83a1e53f SWK |
1740 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1741 | return 0; | |
1742 | ||
496ad9aa | 1743 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1744 | if (isp->smk_mmap == NULL) |
1745 | return 0; | |
809c02e0 SF |
1746 | sbsp = file_inode(file)->i_sb->s_security; |
1747 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && | |
1748 | isp->smk_mmap != sbsp->smk_root) | |
1749 | return -EACCES; | |
2f823ff8 | 1750 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1751 | |
1752 | tsp = current_security(); | |
2f823ff8 | 1753 | skp = smk_of_current(); |
7898e1f8 CS |
1754 | rc = 0; |
1755 | ||
1756 | rcu_read_lock(); | |
1757 | /* | |
1758 | * For each Smack rule associated with the subject | |
1759 | * label verify that the SMACK64MMAP also has access | |
1760 | * to that rule's object label. | |
7898e1f8 | 1761 | */ |
272cd7a8 | 1762 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1763 | okp = srp->smk_object; |
7898e1f8 CS |
1764 | /* |
1765 | * Matching labels always allows access. | |
1766 | */ | |
21c7eae2 | 1767 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1768 | continue; |
0e0a070d CS |
1769 | /* |
1770 | * If there is a matching local rule take | |
1771 | * that into account as well. | |
1772 | */ | |
21c7eae2 LP |
1773 | may = smk_access_entry(srp->smk_subject->smk_known, |
1774 | okp->smk_known, | |
1775 | &tsp->smk_rules); | |
0e0a070d CS |
1776 | if (may == -ENOENT) |
1777 | may = srp->smk_access; | |
1778 | else | |
1779 | may &= srp->smk_access; | |
1780 | /* | |
1781 | * If may is zero the SMACK64MMAP subject can't | |
1782 | * possibly have less access. | |
1783 | */ | |
1784 | if (may == 0) | |
1785 | continue; | |
1786 | ||
1787 | /* | |
1788 | * Fetch the global list entry. | |
1789 | * If there isn't one a SMACK64MMAP subject | |
1790 | * can't have as much access as current. | |
1791 | */ | |
21c7eae2 LP |
1792 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1793 | &mkp->smk_rules); | |
0e0a070d CS |
1794 | if (mmay == -ENOENT) { |
1795 | rc = -EACCES; | |
1796 | break; | |
1797 | } | |
1798 | /* | |
1799 | * If there is a local entry it modifies the | |
1800 | * potential access, too. | |
1801 | */ | |
21c7eae2 LP |
1802 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1803 | &tsp->smk_rules); | |
0e0a070d CS |
1804 | if (tmay != -ENOENT) |
1805 | mmay &= tmay; | |
7898e1f8 | 1806 | |
0e0a070d CS |
1807 | /* |
1808 | * If there is any access available to current that is | |
1809 | * not available to a SMACK64MMAP subject | |
1810 | * deny access. | |
1811 | */ | |
75a25637 | 1812 | if ((may | mmay) != mmay) { |
0e0a070d | 1813 | rc = -EACCES; |
7898e1f8 | 1814 | break; |
0e0a070d | 1815 | } |
7898e1f8 CS |
1816 | } |
1817 | ||
1818 | rcu_read_unlock(); | |
1819 | ||
1820 | return rc; | |
1821 | } | |
1822 | ||
e114e473 CS |
1823 | /** |
1824 | * smack_file_set_fowner - set the file security blob value | |
1825 | * @file: object in question | |
1826 | * | |
e114e473 | 1827 | */ |
e0b93edd | 1828 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1829 | { |
5e7270a6 | 1830 | file->f_security = smk_of_current(); |
e114e473 CS |
1831 | } |
1832 | ||
1833 | /** | |
1834 | * smack_file_send_sigiotask - Smack on sigio | |
1835 | * @tsk: The target task | |
1836 | * @fown: the object the signal come from | |
1837 | * @signum: unused | |
1838 | * | |
1839 | * Allow a privileged task to get signals even if it shouldn't | |
1840 | * | |
1841 | * Returns 0 if a subject with the object's smack could | |
1842 | * write to the task, an error code otherwise. | |
1843 | */ | |
1844 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1845 | struct fown_struct *fown, int signum) | |
1846 | { | |
2f823ff8 CS |
1847 | struct smack_known *skp; |
1848 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
dcb569cf | 1849 | const struct cred *tcred; |
e114e473 CS |
1850 | struct file *file; |
1851 | int rc; | |
ecfcc53f | 1852 | struct smk_audit_info ad; |
e114e473 CS |
1853 | |
1854 | /* | |
1855 | * struct fown_struct is never outside the context of a struct file | |
1856 | */ | |
1857 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1858 | |
ecfcc53f | 1859 | /* we don't log here as rc can be overriden */ |
21c7eae2 | 1860 | skp = file->f_security; |
c60b9066 CS |
1861 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1862 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1863 | |
1864 | rcu_read_lock(); | |
1865 | tcred = __task_cred(tsk); | |
1866 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1867 | rc = 0; |
dcb569cf | 1868 | rcu_read_unlock(); |
ecfcc53f EB |
1869 | |
1870 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1871 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1872 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1873 | return rc; |
1874 | } | |
1875 | ||
1876 | /** | |
1877 | * smack_file_receive - Smack file receive check | |
1878 | * @file: the object | |
1879 | * | |
1880 | * Returns 0 if current has access, error code otherwise | |
1881 | */ | |
1882 | static int smack_file_receive(struct file *file) | |
1883 | { | |
d166c802 | 1884 | int rc; |
e114e473 | 1885 | int may = 0; |
ecfcc53f | 1886 | struct smk_audit_info ad; |
5e7270a6 | 1887 | struct inode *inode = file_inode(file); |
79be0935 CS |
1888 | struct socket *sock; |
1889 | struct task_smack *tsp; | |
1890 | struct socket_smack *ssp; | |
e114e473 | 1891 | |
9777582e SWK |
1892 | if (unlikely(IS_PRIVATE(inode))) |
1893 | return 0; | |
1894 | ||
4482a44f | 1895 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1896 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1897 | |
51d59af2 | 1898 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1899 | sock = SOCKET_I(inode); |
1900 | ssp = sock->sk->sk_security; | |
1901 | tsp = current_security(); | |
1902 | /* | |
1903 | * If the receiving process can't write to the | |
1904 | * passed socket or if the passed socket can't | |
1905 | * write to the receiving process don't accept | |
1906 | * the passed socket. | |
1907 | */ | |
1908 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1909 | rc = smk_bu_file(file, may, rc); | |
1910 | if (rc < 0) | |
1911 | return rc; | |
1912 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1913 | rc = smk_bu_file(file, may, rc); | |
1914 | return rc; | |
1915 | } | |
e114e473 CS |
1916 | /* |
1917 | * This code relies on bitmasks. | |
1918 | */ | |
1919 | if (file->f_mode & FMODE_READ) | |
1920 | may = MAY_READ; | |
1921 | if (file->f_mode & FMODE_WRITE) | |
1922 | may |= MAY_WRITE; | |
1923 | ||
5e7270a6 | 1924 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1925 | rc = smk_bu_file(file, may, rc); |
1926 | return rc; | |
e114e473 CS |
1927 | } |
1928 | ||
531f1d45 | 1929 | /** |
83d49856 | 1930 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1931 | * @file: the object |
a6834c0b | 1932 | * @cred: task credential |
531f1d45 CS |
1933 | * |
1934 | * Set the security blob in the file structure. | |
a6834c0b CS |
1935 | * Allow the open only if the task has read access. There are |
1936 | * many read operations (e.g. fstat) that you can do with an | |
1937 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1938 | * |
1939 | * Returns 0 | |
1940 | */ | |
94817692 | 1941 | static int smack_file_open(struct file *file) |
531f1d45 | 1942 | { |
94817692 | 1943 | struct task_smack *tsp = file->f_cred->security; |
5e7270a6 | 1944 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1945 | struct smk_audit_info ad; |
1946 | int rc; | |
531f1d45 | 1947 | |
a6834c0b CS |
1948 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1949 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1950 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1951 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1952 | |
1953 | return rc; | |
531f1d45 CS |
1954 | } |
1955 | ||
e114e473 CS |
1956 | /* |
1957 | * Task hooks | |
1958 | */ | |
1959 | ||
ee18d64c DH |
1960 | /** |
1961 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1962 | * @new: the new credentials | |
1963 | * @gfp: the atomicity of any memory allocations | |
1964 | * | |
1965 | * Prepare a blank set of credentials for modification. This must allocate all | |
1966 | * the memory the LSM module might require such that cred_transfer() can | |
1967 | * complete without error. | |
1968 | */ | |
1969 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1970 | { | |
7898e1f8 CS |
1971 | struct task_smack *tsp; |
1972 | ||
1973 | tsp = new_task_smack(NULL, NULL, gfp); | |
1974 | if (tsp == NULL) | |
676dac4b | 1975 | return -ENOMEM; |
7898e1f8 CS |
1976 | |
1977 | cred->security = tsp; | |
1978 | ||
ee18d64c DH |
1979 | return 0; |
1980 | } | |
1981 | ||
1982 | ||
e114e473 | 1983 | /** |
f1752eec DH |
1984 | * smack_cred_free - "free" task-level security credentials |
1985 | * @cred: the credentials in question | |
e114e473 | 1986 | * |
e114e473 | 1987 | */ |
f1752eec | 1988 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1989 | { |
7898e1f8 CS |
1990 | struct task_smack *tsp = cred->security; |
1991 | struct smack_rule *rp; | |
1992 | struct list_head *l; | |
1993 | struct list_head *n; | |
1994 | ||
1995 | if (tsp == NULL) | |
1996 | return; | |
1997 | cred->security = NULL; | |
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); | |
2004 | kfree(rp); | |
2005 | } | |
2006 | kfree(tsp); | |
e114e473 CS |
2007 | } |
2008 | ||
d84f4f99 DH |
2009 | /** |
2010 | * smack_cred_prepare - prepare new set of credentials for modification | |
2011 | * @new: the new credentials | |
2012 | * @old: the original credentials | |
2013 | * @gfp: the atomicity of any memory allocations | |
2014 | * | |
2015 | * Prepare a new set of credentials for modification. | |
2016 | */ | |
2017 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
2018 | gfp_t gfp) | |
2019 | { | |
676dac4b CS |
2020 | struct task_smack *old_tsp = old->security; |
2021 | struct task_smack *new_tsp; | |
7898e1f8 | 2022 | int rc; |
676dac4b | 2023 | |
7898e1f8 | 2024 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
2025 | if (new_tsp == NULL) |
2026 | return -ENOMEM; | |
2027 | ||
b437aba8 HS |
2028 | new->security = new_tsp; |
2029 | ||
7898e1f8 CS |
2030 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2031 | if (rc != 0) | |
2032 | return rc; | |
2033 | ||
38416e53 ZJ |
2034 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2035 | gfp); | |
2036 | if (rc != 0) | |
2037 | return rc; | |
2038 | ||
d84f4f99 DH |
2039 | return 0; |
2040 | } | |
2041 | ||
ee18d64c DH |
2042 | /** |
2043 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2044 | * @new: the new credentials | |
2045 | * @old: the original credentials | |
2046 | * | |
2047 | * Fill in a set of blank credentials from another set of credentials. | |
2048 | */ | |
2049 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2050 | { | |
676dac4b CS |
2051 | struct task_smack *old_tsp = old->security; |
2052 | struct task_smack *new_tsp = new->security; | |
2053 | ||
2054 | new_tsp->smk_task = old_tsp->smk_task; | |
2055 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2056 | mutex_init(&new_tsp->smk_rules_lock); |
2057 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2058 | ||
2059 | ||
2060 | /* cbs copy rule list */ | |
ee18d64c DH |
2061 | } |
2062 | ||
3ec30113 MG |
2063 | /** |
2064 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
2065 | * @c: the object creds | |
2066 | * @secid: where to put the result | |
2067 | * | |
2068 | * Sets the secid to contain a u32 version of the smack label. | |
2069 | */ | |
2070 | static void smack_cred_getsecid(const struct cred *c, u32 *secid) | |
2071 | { | |
2072 | struct smack_known *skp; | |
2073 | ||
2074 | rcu_read_lock(); | |
2075 | skp = smk_of_task(c->security); | |
2076 | *secid = skp->smk_secid; | |
2077 | rcu_read_unlock(); | |
2078 | } | |
2079 | ||
3a3b7ce9 DH |
2080 | /** |
2081 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2082 | * @new: points to the set of credentials to be modified. |
2083 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2084 | * |
2085 | * Set the security data for a kernel service. | |
2086 | */ | |
2087 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2088 | { | |
676dac4b | 2089 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 | 2090 | |
152f91d4 | 2091 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2092 | return 0; |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2097 | * @new: points to the set of credentials to be modified |
2098 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2099 | * |
2100 | * Set the file creation context in a set of credentials to the same | |
2101 | * as the objective context of the specified inode | |
2102 | */ | |
2103 | static int smack_kernel_create_files_as(struct cred *new, | |
2104 | struct inode *inode) | |
2105 | { | |
2106 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2107 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2108 | |
21c7eae2 | 2109 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2110 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2111 | return 0; |
2112 | } | |
2113 | ||
ecfcc53f EB |
2114 | /** |
2115 | * smk_curacc_on_task - helper to log task related access | |
2116 | * @p: the task object | |
531f1d45 CS |
2117 | * @access: the access requested |
2118 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2119 | * |
2120 | * Return 0 if access is permitted | |
2121 | */ | |
531f1d45 CS |
2122 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2123 | const char *caller) | |
ecfcc53f EB |
2124 | { |
2125 | struct smk_audit_info ad; | |
6d1cff2a | 2126 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2127 | int rc; |
ecfcc53f | 2128 | |
531f1d45 | 2129 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2130 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2131 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2132 | rc = smk_bu_task(p, access, rc); |
2133 | return rc; | |
ecfcc53f EB |
2134 | } |
2135 | ||
e114e473 CS |
2136 | /** |
2137 | * smack_task_setpgid - Smack check on setting pgid | |
2138 | * @p: the task object | |
2139 | * @pgid: unused | |
2140 | * | |
2141 | * Return 0 if write access is permitted | |
2142 | */ | |
2143 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2144 | { | |
531f1d45 | 2145 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2146 | } |
2147 | ||
2148 | /** | |
2149 | * smack_task_getpgid - Smack access check for getpgid | |
2150 | * @p: the object task | |
2151 | * | |
2152 | * Returns 0 if current can read the object task, error code otherwise | |
2153 | */ | |
2154 | static int smack_task_getpgid(struct task_struct *p) | |
2155 | { | |
531f1d45 | 2156 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2157 | } |
2158 | ||
2159 | /** | |
2160 | * smack_task_getsid - Smack access check for getsid | |
2161 | * @p: the object task | |
2162 | * | |
2163 | * Returns 0 if current can read the object task, error code otherwise | |
2164 | */ | |
2165 | static int smack_task_getsid(struct task_struct *p) | |
2166 | { | |
531f1d45 | 2167 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2168 | } |
2169 | ||
2170 | /** | |
2171 | * smack_task_getsecid - get the secid of the task | |
2172 | * @p: the object task | |
2173 | * @secid: where to put the result | |
2174 | * | |
2175 | * Sets the secid to contain a u32 version of the smack label. | |
2176 | */ | |
2177 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2178 | { | |
6d1cff2a | 2179 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2180 | |
2181 | *secid = skp->smk_secid; | |
e114e473 CS |
2182 | } |
2183 | ||
2184 | /** | |
2185 | * smack_task_setnice - Smack check on setting nice | |
2186 | * @p: the task object | |
2187 | * @nice: unused | |
2188 | * | |
2189 | * Return 0 if write access is permitted | |
2190 | */ | |
2191 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2192 | { | |
b1d9e6b0 | 2193 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2194 | } |
2195 | ||
2196 | /** | |
2197 | * smack_task_setioprio - Smack check on setting ioprio | |
2198 | * @p: the task object | |
2199 | * @ioprio: unused | |
2200 | * | |
2201 | * Return 0 if write access is permitted | |
2202 | */ | |
2203 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2204 | { | |
b1d9e6b0 | 2205 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2206 | } |
2207 | ||
2208 | /** | |
2209 | * smack_task_getioprio - Smack check on reading ioprio | |
2210 | * @p: the task object | |
2211 | * | |
2212 | * Return 0 if read access is permitted | |
2213 | */ | |
2214 | static int smack_task_getioprio(struct task_struct *p) | |
2215 | { | |
531f1d45 | 2216 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2217 | } |
2218 | ||
2219 | /** | |
2220 | * smack_task_setscheduler - Smack check on setting scheduler | |
2221 | * @p: the task object | |
2222 | * @policy: unused | |
2223 | * @lp: unused | |
2224 | * | |
2225 | * Return 0 if read access is permitted | |
2226 | */ | |
b0ae1981 | 2227 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2228 | { |
b1d9e6b0 | 2229 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2230 | } |
2231 | ||
2232 | /** | |
2233 | * smack_task_getscheduler - Smack check on reading scheduler | |
2234 | * @p: the task object | |
2235 | * | |
2236 | * Return 0 if read access is permitted | |
2237 | */ | |
2238 | static int smack_task_getscheduler(struct task_struct *p) | |
2239 | { | |
531f1d45 | 2240 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2241 | } |
2242 | ||
2243 | /** | |
2244 | * smack_task_movememory - Smack check on moving memory | |
2245 | * @p: the task object | |
2246 | * | |
2247 | * Return 0 if write access is permitted | |
2248 | */ | |
2249 | static int smack_task_movememory(struct task_struct *p) | |
2250 | { | |
531f1d45 | 2251 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2252 | } |
2253 | ||
2254 | /** | |
2255 | * smack_task_kill - Smack check on signal delivery | |
2256 | * @p: the task object | |
2257 | * @info: unused | |
2258 | * @sig: unused | |
6b4f3d01 | 2259 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2260 | * |
2261 | * Return 0 if write access is permitted | |
2262 | * | |
e114e473 | 2263 | */ |
ae7795bc | 2264 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2265 | int sig, const struct cred *cred) |
e114e473 | 2266 | { |
ecfcc53f | 2267 | struct smk_audit_info ad; |
2f823ff8 | 2268 | struct smack_known *skp; |
6d1cff2a | 2269 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2270 | int rc; |
ecfcc53f | 2271 | |
18d872f7 RK |
2272 | if (!sig) |
2273 | return 0; /* null signal; existence test */ | |
2274 | ||
ecfcc53f EB |
2275 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2276 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2277 | /* |
2278 | * Sending a signal requires that the sender | |
2279 | * can write the receiver. | |
2280 | */ | |
6b4f3d01 | 2281 | if (cred == NULL) { |
c60b9066 CS |
2282 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2283 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2284 | return rc; |
2285 | } | |
e114e473 | 2286 | /* |
6b4f3d01 | 2287 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2288 | * specific behavior. This is not clean. For one thing |
2289 | * we can't take privilege into account. | |
2290 | */ | |
6b4f3d01 | 2291 | skp = smk_of_task(cred->security); |
c60b9066 CS |
2292 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2293 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2294 | return rc; |
e114e473 CS |
2295 | } |
2296 | ||
e114e473 CS |
2297 | /** |
2298 | * smack_task_to_inode - copy task smack into the inode blob | |
2299 | * @p: task to copy from | |
251a2a95 | 2300 | * @inode: inode to copy to |
e114e473 CS |
2301 | * |
2302 | * Sets the smack pointer in the inode security blob | |
2303 | */ | |
2304 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2305 | { | |
2306 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2307 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2308 | |
21c7eae2 | 2309 | isp->smk_inode = skp; |
7b4e8843 | 2310 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2311 | } |
2312 | ||
2313 | /* | |
2314 | * Socket hooks. | |
2315 | */ | |
2316 | ||
2317 | /** | |
2318 | * smack_sk_alloc_security - Allocate a socket blob | |
2319 | * @sk: the socket | |
2320 | * @family: unused | |
251a2a95 | 2321 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2322 | * |
2323 | * Assign Smack pointers to current | |
2324 | * | |
2325 | * Returns 0 on success, -ENOMEM is there's no memory | |
2326 | */ | |
2327 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2328 | { | |
2f823ff8 | 2329 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2330 | struct socket_smack *ssp; |
2331 | ||
2332 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2333 | if (ssp == NULL) | |
2334 | return -ENOMEM; | |
2335 | ||
08382c9f | 2336 | /* |
2337 | * Sockets created by kernel threads receive web label. | |
2338 | */ | |
2339 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2340 | ssp->smk_in = &smack_known_web; | |
2341 | ssp->smk_out = &smack_known_web; | |
2342 | } else { | |
2343 | ssp->smk_in = skp; | |
2344 | ssp->smk_out = skp; | |
2345 | } | |
272cd7a8 | 2346 | ssp->smk_packet = NULL; |
e114e473 CS |
2347 | |
2348 | sk->sk_security = ssp; | |
2349 | ||
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | /** | |
2354 | * smack_sk_free_security - Free a socket blob | |
2355 | * @sk: the socket | |
2356 | * | |
2357 | * Clears the blob pointer | |
2358 | */ | |
2359 | static void smack_sk_free_security(struct sock *sk) | |
2360 | { | |
0c96d1f5 VG |
2361 | #ifdef SMACK_IPV6_PORT_LABELING |
2362 | struct smk_port_label *spp; | |
2363 | ||
2364 | if (sk->sk_family == PF_INET6) { | |
2365 | rcu_read_lock(); | |
2366 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2367 | if (spp->smk_sock != sk) | |
2368 | continue; | |
2369 | spp->smk_can_reuse = 1; | |
2370 | break; | |
2371 | } | |
2372 | rcu_read_unlock(); | |
2373 | } | |
2374 | #endif | |
e114e473 CS |
2375 | kfree(sk->sk_security); |
2376 | } | |
2377 | ||
07feee8f | 2378 | /** |
21abb1ec | 2379 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2380 | * @sip: the object end |
2381 | * | |
2382 | * looks for host based access restrictions | |
2383 | * | |
2384 | * This version will only be appropriate for really small sets of single label | |
2385 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2386 | * taken before calling this function. | |
2387 | * | |
2388 | * Returns the label of the far end or NULL if it's not special. | |
2389 | */ | |
21abb1ec | 2390 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2391 | { |
21abb1ec | 2392 | struct smk_net4addr *snp; |
07feee8f PM |
2393 | struct in_addr *siap = &sip->sin_addr; |
2394 | ||
2395 | if (siap->s_addr == 0) | |
2396 | return NULL; | |
2397 | ||
21abb1ec CS |
2398 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2399 | /* | |
2400 | * we break after finding the first match because | |
2401 | * the list is sorted from longest to shortest mask | |
2402 | * so we have found the most specific match | |
2403 | */ | |
2404 | if (snp->smk_host.s_addr == | |
2405 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2406 | return snp->smk_label; | |
2407 | ||
2408 | return NULL; | |
2409 | } | |
2410 | ||
2411 | #if IS_ENABLED(CONFIG_IPV6) | |
2412 | /* | |
2413 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2414 | * @sip: the address | |
2415 | * | |
2416 | * Returns boolean true if this is the localhost address | |
2417 | */ | |
2418 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2419 | { | |
2420 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2421 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2422 | ||
2423 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2424 | ntohs(be16p[7]) == 1) | |
2425 | return true; | |
2426 | return false; | |
2427 | } | |
2428 | ||
2429 | /** | |
2430 | * smack_ipv6host_label - check host based restrictions | |
2431 | * @sip: the object end | |
2432 | * | |
2433 | * looks for host based access restrictions | |
2434 | * | |
2435 | * This version will only be appropriate for really small sets of single label | |
2436 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2437 | * taken before calling this function. | |
2438 | * | |
2439 | * Returns the label of the far end or NULL if it's not special. | |
2440 | */ | |
2441 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2442 | { | |
2443 | struct smk_net6addr *snp; | |
2444 | struct in6_addr *sap = &sip->sin6_addr; | |
2445 | int i; | |
2446 | int found = 0; | |
2447 | ||
2448 | /* | |
2449 | * It's local. Don't look for a host label. | |
2450 | */ | |
2451 | if (smk_ipv6_localhost(sip)) | |
2452 | return NULL; | |
2453 | ||
2454 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2455 | /* |
2456 | * If the label is NULL the entry has | |
2457 | * been renounced. Ignore it. | |
2458 | */ | |
2459 | if (snp->smk_label == NULL) | |
2460 | continue; | |
07feee8f PM |
2461 | /* |
2462 | * we break after finding the first match because | |
2463 | * the list is sorted from longest to shortest mask | |
2464 | * so we have found the most specific match | |
2465 | */ | |
21abb1ec | 2466 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2467 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2468 | snp->smk_host.s6_addr16[i]) { | |
2469 | found = 0; | |
2470 | break; | |
2471 | } | |
4303154e | 2472 | } |
21abb1ec CS |
2473 | if (found) |
2474 | return snp->smk_label; | |
2475 | } | |
07feee8f PM |
2476 | |
2477 | return NULL; | |
2478 | } | |
21abb1ec | 2479 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2480 | |
e114e473 CS |
2481 | /** |
2482 | * smack_netlabel - Set the secattr on a socket | |
2483 | * @sk: the socket | |
6d3dc07c | 2484 | * @labeled: socket label scheme |
e114e473 CS |
2485 | * |
2486 | * Convert the outbound smack value (smk_out) to a | |
2487 | * secattr and attach it to the socket. | |
2488 | * | |
2489 | * Returns 0 on success or an error code | |
2490 | */ | |
6d3dc07c | 2491 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2492 | { |
f7112e6c | 2493 | struct smack_known *skp; |
07feee8f | 2494 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2495 | int rc = 0; |
e114e473 | 2496 | |
6d3dc07c CS |
2497 | /* |
2498 | * Usually the netlabel code will handle changing the | |
2499 | * packet labeling based on the label. | |
2500 | * The case of a single label host is different, because | |
2501 | * a single label host should never get a labeled packet | |
2502 | * even though the label is usually associated with a packet | |
2503 | * label. | |
2504 | */ | |
2505 | local_bh_disable(); | |
2506 | bh_lock_sock_nested(sk); | |
2507 | ||
2508 | if (ssp->smk_out == smack_net_ambient || | |
2509 | labeled == SMACK_UNLABELED_SOCKET) | |
2510 | netlbl_sock_delattr(sk); | |
2511 | else { | |
2f823ff8 | 2512 | skp = ssp->smk_out; |
f7112e6c | 2513 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2514 | } |
2515 | ||
2516 | bh_unlock_sock(sk); | |
2517 | local_bh_enable(); | |
4bc87e62 | 2518 | |
e114e473 CS |
2519 | return rc; |
2520 | } | |
2521 | ||
07feee8f PM |
2522 | /** |
2523 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2524 | * @sk: the socket | |
2525 | * @sap: the destination address | |
2526 | * | |
2527 | * Set the correct secattr for the given socket based on the destination | |
2528 | * address and perform any outbound access checks needed. | |
2529 | * | |
2530 | * Returns 0 on success or an error code. | |
2531 | * | |
2532 | */ | |
2533 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2534 | { | |
2f823ff8 | 2535 | struct smack_known *skp; |
07feee8f PM |
2536 | int rc; |
2537 | int sk_lbl; | |
21c7eae2 | 2538 | struct smack_known *hkp; |
07feee8f | 2539 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2540 | struct smk_audit_info ad; |
07feee8f PM |
2541 | |
2542 | rcu_read_lock(); | |
21abb1ec | 2543 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2544 | if (hkp != NULL) { |
ecfcc53f | 2545 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2546 | struct lsm_network_audit net; |
2547 | ||
48c62af6 EP |
2548 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2549 | ad.a.u.net->family = sap->sin_family; | |
2550 | ad.a.u.net->dport = sap->sin_port; | |
2551 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2552 | #endif |
923e9a13 | 2553 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2554 | skp = ssp->smk_out; |
21c7eae2 LP |
2555 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2556 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2557 | } else { |
2558 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2559 | rc = 0; | |
2560 | } | |
2561 | rcu_read_unlock(); | |
2562 | if (rc != 0) | |
2563 | return rc; | |
2564 | ||
2565 | return smack_netlabel(sk, sk_lbl); | |
2566 | } | |
2567 | ||
21abb1ec CS |
2568 | #if IS_ENABLED(CONFIG_IPV6) |
2569 | /** | |
2570 | * smk_ipv6_check - check Smack access | |
2571 | * @subject: subject Smack label | |
2572 | * @object: object Smack label | |
2573 | * @address: address | |
2574 | * @act: the action being taken | |
2575 | * | |
2576 | * Check an IPv6 access | |
2577 | */ | |
2578 | static int smk_ipv6_check(struct smack_known *subject, | |
2579 | struct smack_known *object, | |
2580 | struct sockaddr_in6 *address, int act) | |
2581 | { | |
2582 | #ifdef CONFIG_AUDIT | |
2583 | struct lsm_network_audit net; | |
2584 | #endif | |
2585 | struct smk_audit_info ad; | |
2586 | int rc; | |
2587 | ||
2588 | #ifdef CONFIG_AUDIT | |
2589 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2590 | ad.a.u.net->family = PF_INET6; | |
2591 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2592 | if (act == SMK_RECEIVING) | |
2593 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2594 | else | |
2595 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2596 | #endif | |
2597 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2598 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2599 | return rc; | |
2600 | } | |
2601 | #endif /* CONFIG_IPV6 */ | |
2602 | ||
2603 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2604 | /** |
2605 | * smk_ipv6_port_label - Smack port access table management | |
2606 | * @sock: socket | |
2607 | * @address: address | |
2608 | * | |
2609 | * Create or update the port list entry | |
2610 | */ | |
2611 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2612 | { | |
2613 | struct sock *sk = sock->sk; | |
2614 | struct sockaddr_in6 *addr6; | |
2615 | struct socket_smack *ssp = sock->sk->sk_security; | |
2616 | struct smk_port_label *spp; | |
2617 | unsigned short port = 0; | |
2618 | ||
2619 | if (address == NULL) { | |
2620 | /* | |
2621 | * This operation is changing the Smack information | |
2622 | * on the bound socket. Take the changes to the port | |
2623 | * as well. | |
2624 | */ | |
3c7ce342 VG |
2625 | rcu_read_lock(); |
2626 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2627 | if (sk != spp->smk_sock) |
2628 | continue; | |
2629 | spp->smk_in = ssp->smk_in; | |
2630 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2631 | rcu_read_unlock(); |
c6739443 CS |
2632 | return; |
2633 | } | |
2634 | /* | |
2635 | * A NULL address is only used for updating existing | |
2636 | * bound entries. If there isn't one, it's OK. | |
2637 | */ | |
3c7ce342 | 2638 | rcu_read_unlock(); |
c6739443 CS |
2639 | return; |
2640 | } | |
2641 | ||
2642 | addr6 = (struct sockaddr_in6 *)address; | |
2643 | port = ntohs(addr6->sin6_port); | |
2644 | /* | |
2645 | * This is a special case that is safely ignored. | |
2646 | */ | |
2647 | if (port == 0) | |
2648 | return; | |
2649 | ||
2650 | /* | |
2651 | * Look for an existing port list entry. | |
2652 | * This is an indication that a port is getting reused. | |
2653 | */ | |
3c7ce342 VG |
2654 | rcu_read_lock(); |
2655 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2656 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2657 | continue; |
0c96d1f5 VG |
2658 | if (spp->smk_can_reuse != 1) { |
2659 | rcu_read_unlock(); | |
2660 | return; | |
2661 | } | |
c6739443 CS |
2662 | spp->smk_port = port; |
2663 | spp->smk_sock = sk; | |
2664 | spp->smk_in = ssp->smk_in; | |
2665 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2666 | spp->smk_can_reuse = 0; |
3c7ce342 | 2667 | rcu_read_unlock(); |
c6739443 CS |
2668 | return; |
2669 | } | |
3c7ce342 | 2670 | rcu_read_unlock(); |
c6739443 CS |
2671 | /* |
2672 | * A new port entry is required. | |
2673 | */ | |
2674 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2675 | if (spp == NULL) | |
2676 | return; | |
2677 | ||
2678 | spp->smk_port = port; | |
2679 | spp->smk_sock = sk; | |
2680 | spp->smk_in = ssp->smk_in; | |
2681 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2682 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2683 | spp->smk_can_reuse = 0; |
c6739443 | 2684 | |
3c7ce342 VG |
2685 | mutex_lock(&smack_ipv6_lock); |
2686 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2687 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2688 | return; |
2689 | } | |
2690 | ||
2691 | /** | |
2692 | * smk_ipv6_port_check - check Smack port access | |
2693 | * @sock: socket | |
2694 | * @address: address | |
2695 | * | |
2696 | * Create or update the port list entry | |
2697 | */ | |
6ea06247 | 2698 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2699 | int act) |
2700 | { | |
c6739443 CS |
2701 | struct smk_port_label *spp; |
2702 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2703 | struct smack_known *skp = NULL; |
2704 | unsigned short port; | |
21c7eae2 | 2705 | struct smack_known *object; |
c6739443 CS |
2706 | |
2707 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2708 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2709 | object = ssp->smk_in; |
c6739443 | 2710 | } else { |
2f823ff8 | 2711 | skp = ssp->smk_out; |
21abb1ec | 2712 | object = smack_ipv6host_label(address); |
c6739443 CS |
2713 | } |
2714 | ||
2715 | /* | |
21abb1ec | 2716 | * The other end is a single label host. |
c6739443 | 2717 | */ |
21abb1ec CS |
2718 | if (skp != NULL && object != NULL) |
2719 | return smk_ipv6_check(skp, object, address, act); | |
2720 | if (skp == NULL) | |
2721 | skp = smack_net_ambient; | |
2722 | if (object == NULL) | |
2723 | object = smack_net_ambient; | |
c6739443 CS |
2724 | |
2725 | /* | |
2726 | * It's remote, so port lookup does no good. | |
2727 | */ | |
21abb1ec CS |
2728 | if (!smk_ipv6_localhost(address)) |
2729 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2730 | |
2731 | /* | |
2732 | * It's local so the send check has to have passed. | |
2733 | */ | |
21abb1ec CS |
2734 | if (act == SMK_RECEIVING) |
2735 | return 0; | |
c6739443 | 2736 | |
21abb1ec | 2737 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2738 | rcu_read_lock(); |
2739 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2740 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2741 | continue; |
21c7eae2 | 2742 | object = spp->smk_in; |
c6739443 | 2743 | if (act == SMK_CONNECTING) |
54e70ec5 | 2744 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2745 | break; |
2746 | } | |
3c7ce342 | 2747 | rcu_read_unlock(); |
c6739443 | 2748 | |
21abb1ec | 2749 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2750 | } |
21abb1ec | 2751 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2752 | |
e114e473 CS |
2753 | /** |
2754 | * smack_inode_setsecurity - set smack xattrs | |
2755 | * @inode: the object | |
2756 | * @name: attribute name | |
2757 | * @value: attribute value | |
2758 | * @size: size of the attribute | |
2759 | * @flags: unused | |
2760 | * | |
2761 | * Sets the named attribute in the appropriate blob | |
2762 | * | |
2763 | * Returns 0 on success, or an error code | |
2764 | */ | |
2765 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2766 | const void *value, size_t size, int flags) | |
2767 | { | |
2f823ff8 | 2768 | struct smack_known *skp; |
e114e473 CS |
2769 | struct inode_smack *nsp = inode->i_security; |
2770 | struct socket_smack *ssp; | |
2771 | struct socket *sock; | |
4bc87e62 | 2772 | int rc = 0; |
e114e473 | 2773 | |
f7112e6c | 2774 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2775 | return -EINVAL; |
e114e473 | 2776 | |
2f823ff8 | 2777 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2778 | if (IS_ERR(skp)) |
2779 | return PTR_ERR(skp); | |
e114e473 CS |
2780 | |
2781 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2782 | nsp->smk_inode = skp; |
ddd29ec6 | 2783 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2784 | return 0; |
2785 | } | |
2786 | /* | |
2787 | * The rest of the Smack xattrs are only on sockets. | |
2788 | */ | |
2789 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2790 | return -EOPNOTSUPP; | |
2791 | ||
2792 | sock = SOCKET_I(inode); | |
2e1d146a | 2793 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2794 | return -EOPNOTSUPP; |
2795 | ||
2796 | ssp = sock->sk->sk_security; | |
2797 | ||
2798 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2799 | ssp->smk_in = skp; |
e114e473 | 2800 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2801 | ssp->smk_out = skp; |
c6739443 | 2802 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2803 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2804 | if (rc != 0) | |
2805 | printk(KERN_WARNING | |
2806 | "Smack: \"%s\" netlbl error %d.\n", | |
2807 | __func__, -rc); | |
2808 | } | |
e114e473 CS |
2809 | } else |
2810 | return -EOPNOTSUPP; | |
2811 | ||
21abb1ec | 2812 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2813 | if (sock->sk->sk_family == PF_INET6) |
2814 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2815 | #endif |
c6739443 | 2816 | |
e114e473 CS |
2817 | return 0; |
2818 | } | |
2819 | ||
2820 | /** | |
2821 | * smack_socket_post_create - finish socket setup | |
2822 | * @sock: the socket | |
2823 | * @family: protocol family | |
2824 | * @type: unused | |
2825 | * @protocol: unused | |
2826 | * @kern: unused | |
2827 | * | |
2828 | * Sets the netlabel information on the socket | |
2829 | * | |
2830 | * Returns 0 on success, and error code otherwise | |
2831 | */ | |
2832 | static int smack_socket_post_create(struct socket *sock, int family, | |
2833 | int type, int protocol, int kern) | |
2834 | { | |
7412301b ML |
2835 | struct socket_smack *ssp; |
2836 | ||
2837 | if (sock->sk == NULL) | |
2838 | return 0; | |
2839 | ||
2840 | /* | |
2841 | * Sockets created by kernel threads receive web label. | |
2842 | */ | |
2843 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2844 | ssp = sock->sk->sk_security; | |
2845 | ssp->smk_in = &smack_known_web; | |
2846 | ssp->smk_out = &smack_known_web; | |
2847 | } | |
2848 | ||
2849 | if (family != PF_INET) | |
e114e473 CS |
2850 | return 0; |
2851 | /* | |
2852 | * Set the outbound netlbl. | |
2853 | */ | |
6d3dc07c CS |
2854 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2855 | } | |
2856 | ||
5859cdf5 TG |
2857 | /** |
2858 | * smack_socket_socketpair - create socket pair | |
2859 | * @socka: one socket | |
2860 | * @sockb: another socket | |
2861 | * | |
2862 | * Cross reference the peer labels for SO_PEERSEC | |
2863 | * | |
2864 | * Returns 0 on success, and error code otherwise | |
2865 | */ | |
2866 | static int smack_socket_socketpair(struct socket *socka, | |
2867 | struct socket *sockb) | |
2868 | { | |
2869 | struct socket_smack *asp = socka->sk->sk_security; | |
2870 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2871 | ||
2872 | asp->smk_packet = bsp->smk_out; | |
2873 | bsp->smk_packet = asp->smk_out; | |
2874 | ||
2875 | return 0; | |
2876 | } | |
2877 | ||
21abb1ec | 2878 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2879 | /** |
2880 | * smack_socket_bind - record port binding information. | |
2881 | * @sock: the socket | |
2882 | * @address: the port address | |
2883 | * @addrlen: size of the address | |
2884 | * | |
2885 | * Records the label bound to a port. | |
2886 | * | |
2887 | * Returns 0 | |
2888 | */ | |
2889 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2890 | int addrlen) | |
2891 | { | |
2892 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2893 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2894 | return 0; |
2895 | } | |
21abb1ec | 2896 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2897 | |
6d3dc07c CS |
2898 | /** |
2899 | * smack_socket_connect - connect access check | |
2900 | * @sock: the socket | |
2901 | * @sap: the other end | |
2902 | * @addrlen: size of sap | |
2903 | * | |
2904 | * Verifies that a connection may be possible | |
2905 | * | |
2906 | * Returns 0 on success, and error code otherwise | |
2907 | */ | |
2908 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2909 | int addrlen) | |
2910 | { | |
c6739443 | 2911 | int rc = 0; |
21abb1ec CS |
2912 | #if IS_ENABLED(CONFIG_IPV6) |
2913 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2914 | #endif | |
2915 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2916 | struct smack_known *rsp; | |
da49b5da | 2917 | struct socket_smack *ssp; |
21abb1ec | 2918 | #endif |
c6739443 CS |
2919 | |
2920 | if (sock->sk == NULL) | |
6d3dc07c | 2921 | return 0; |
6d3dc07c | 2922 | |
da49b5da VG |
2923 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2924 | ssp = sock->sk->sk_security; | |
2925 | #endif | |
2926 | ||
c6739443 CS |
2927 | switch (sock->sk->sk_family) { |
2928 | case PF_INET: | |
2929 | if (addrlen < sizeof(struct sockaddr_in)) | |
2930 | return -EINVAL; | |
2931 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2932 | break; | |
2933 | case PF_INET6: | |
2934 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2935 | return -EINVAL; | |
21abb1ec CS |
2936 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2937 | rsp = smack_ipv6host_label(sip); | |
2938 | if (rsp != NULL) | |
2939 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2940 | SMK_CONNECTING); |
21abb1ec CS |
2941 | #endif |
2942 | #ifdef SMACK_IPV6_PORT_LABELING | |
2943 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2944 | #endif | |
c6739443 CS |
2945 | break; |
2946 | } | |
2947 | return rc; | |
e114e473 CS |
2948 | } |
2949 | ||
2950 | /** | |
2951 | * smack_flags_to_may - convert S_ to MAY_ values | |
2952 | * @flags: the S_ value | |
2953 | * | |
2954 | * Returns the equivalent MAY_ value | |
2955 | */ | |
2956 | static int smack_flags_to_may(int flags) | |
2957 | { | |
2958 | int may = 0; | |
2959 | ||
2960 | if (flags & S_IRUGO) | |
2961 | may |= MAY_READ; | |
2962 | if (flags & S_IWUGO) | |
2963 | may |= MAY_WRITE; | |
2964 | if (flags & S_IXUGO) | |
2965 | may |= MAY_EXEC; | |
2966 | ||
2967 | return may; | |
2968 | } | |
2969 | ||
2970 | /** | |
2971 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2972 | * @msg: the object | |
2973 | * | |
2974 | * Returns 0 | |
2975 | */ | |
2976 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2977 | { | |
2f823ff8 CS |
2978 | struct smack_known *skp = smk_of_current(); |
2979 | ||
21c7eae2 | 2980 | msg->security = skp; |
e114e473 CS |
2981 | return 0; |
2982 | } | |
2983 | ||
2984 | /** | |
2985 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2986 | * @msg: the object | |
2987 | * | |
2988 | * Clears the blob pointer | |
2989 | */ | |
2990 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2991 | { | |
2992 | msg->security = NULL; | |
2993 | } | |
2994 | ||
2995 | /** | |
0d79cbf8 EB |
2996 | * smack_of_ipc - the smack pointer for the ipc |
2997 | * @isp: the object | |
e114e473 CS |
2998 | * |
2999 | * Returns a pointer to the smack value | |
3000 | */ | |
0d79cbf8 | 3001 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 3002 | { |
0d79cbf8 | 3003 | return (struct smack_known *)isp->security; |
e114e473 CS |
3004 | } |
3005 | ||
3006 | /** | |
0d79cbf8 EB |
3007 | * smack_ipc_alloc_security - Set the security blob for ipc |
3008 | * @isp: the object | |
e114e473 CS |
3009 | * |
3010 | * Returns 0 | |
3011 | */ | |
0d79cbf8 | 3012 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 3013 | { |
2f823ff8 | 3014 | struct smack_known *skp = smk_of_current(); |
e114e473 | 3015 | |
21c7eae2 | 3016 | isp->security = skp; |
e114e473 CS |
3017 | return 0; |
3018 | } | |
3019 | ||
3020 | /** | |
0d79cbf8 EB |
3021 | * smack_ipc_free_security - Clear the security blob for ipc |
3022 | * @isp: the object | |
e114e473 CS |
3023 | * |
3024 | * Clears the blob pointer | |
3025 | */ | |
0d79cbf8 | 3026 | static void smack_ipc_free_security(struct kern_ipc_perm *isp) |
e114e473 | 3027 | { |
e114e473 CS |
3028 | isp->security = NULL; |
3029 | } | |
3030 | ||
ecfcc53f EB |
3031 | /** |
3032 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 3033 | * @isp : the object |
ecfcc53f EB |
3034 | * @access : access requested |
3035 | * | |
3036 | * Returns 0 if current has the requested access, error code otherwise | |
3037 | */ | |
0d79cbf8 | 3038 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3039 | { |
0d79cbf8 | 3040 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3041 | struct smk_audit_info ad; |
d166c802 | 3042 | int rc; |
ecfcc53f EB |
3043 | |
3044 | #ifdef CONFIG_AUDIT | |
3045 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3046 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3047 | #endif |
d166c802 CS |
3048 | rc = smk_curacc(ssp, access, &ad); |
3049 | rc = smk_bu_current("shm", ssp, access, rc); | |
3050 | return rc; | |
ecfcc53f EB |
3051 | } |
3052 | ||
e114e473 CS |
3053 | /** |
3054 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 3055 | * @isp: the object |
e114e473 CS |
3056 | * @shmflg: access requested |
3057 | * | |
3058 | * Returns 0 if current has the requested access, error code otherwise | |
3059 | */ | |
0d79cbf8 | 3060 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3061 | { |
e114e473 CS |
3062 | int may; |
3063 | ||
3064 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3065 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3066 | } |
3067 | ||
3068 | /** | |
3069 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3070 | * @isp: the object |
e114e473 CS |
3071 | * @cmd: what it wants to do |
3072 | * | |
3073 | * Returns 0 if current has the requested access, error code otherwise | |
3074 | */ | |
0d79cbf8 | 3075 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3076 | { |
e114e473 CS |
3077 | int may; |
3078 | ||
3079 | switch (cmd) { | |
3080 | case IPC_STAT: | |
3081 | case SHM_STAT: | |
c21a6970 | 3082 | case SHM_STAT_ANY: |
e114e473 CS |
3083 | may = MAY_READ; |
3084 | break; | |
3085 | case IPC_SET: | |
3086 | case SHM_LOCK: | |
3087 | case SHM_UNLOCK: | |
3088 | case IPC_RMID: | |
3089 | may = MAY_READWRITE; | |
3090 | break; | |
3091 | case IPC_INFO: | |
3092 | case SHM_INFO: | |
3093 | /* | |
3094 | * System level information. | |
3095 | */ | |
3096 | return 0; | |
3097 | default: | |
3098 | return -EINVAL; | |
3099 | } | |
0d79cbf8 | 3100 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3101 | } |
3102 | ||
3103 | /** | |
3104 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3105 | * @isp: the object |
e114e473 CS |
3106 | * @shmaddr: unused |
3107 | * @shmflg: access requested | |
3108 | * | |
3109 | * Returns 0 if current has the requested access, error code otherwise | |
3110 | */ | |
0d79cbf8 | 3111 | static int smack_shm_shmat(struct kern_ipc_perm *ipc, char __user *shmaddr, |
e114e473 CS |
3112 | int shmflg) |
3113 | { | |
e114e473 CS |
3114 | int may; |
3115 | ||
3116 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3117 | return smk_curacc_shm(ipc, may); |
e114e473 CS |
3118 | } |
3119 | ||
ecfcc53f EB |
3120 | /** |
3121 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3122 | * @isp : the object |
ecfcc53f EB |
3123 | * @access : access requested |
3124 | * | |
3125 | * Returns 0 if current has the requested access, error code otherwise | |
3126 | */ | |
0d79cbf8 | 3127 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3128 | { |
0d79cbf8 | 3129 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3130 | struct smk_audit_info ad; |
d166c802 | 3131 | int rc; |
ecfcc53f EB |
3132 | |
3133 | #ifdef CONFIG_AUDIT | |
3134 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3135 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3136 | #endif |
d166c802 CS |
3137 | rc = smk_curacc(ssp, access, &ad); |
3138 | rc = smk_bu_current("sem", ssp, access, rc); | |
3139 | return rc; | |
ecfcc53f EB |
3140 | } |
3141 | ||
e114e473 CS |
3142 | /** |
3143 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3144 | * @isp: the object |
e114e473 CS |
3145 | * @semflg: access requested |
3146 | * | |
3147 | * Returns 0 if current has the requested access, error code otherwise | |
3148 | */ | |
0d79cbf8 | 3149 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3150 | { |
e114e473 CS |
3151 | int may; |
3152 | ||
3153 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3154 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3155 | } |
3156 | ||
3157 | /** | |
3158 | * smack_sem_shmctl - Smack access check for sem | |
0d79cbf8 | 3159 | * @isp: the object |
e114e473 CS |
3160 | * @cmd: what it wants to do |
3161 | * | |
3162 | * Returns 0 if current has the requested access, error code otherwise | |
3163 | */ | |
0d79cbf8 | 3164 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3165 | { |
e114e473 CS |
3166 | int may; |
3167 | ||
3168 | switch (cmd) { | |
3169 | case GETPID: | |
3170 | case GETNCNT: | |
3171 | case GETZCNT: | |
3172 | case GETVAL: | |
3173 | case GETALL: | |
3174 | case IPC_STAT: | |
3175 | case SEM_STAT: | |
a280d6dc | 3176 | case SEM_STAT_ANY: |
e114e473 CS |
3177 | may = MAY_READ; |
3178 | break; | |
3179 | case SETVAL: | |
3180 | case SETALL: | |
3181 | case IPC_RMID: | |
3182 | case IPC_SET: | |
3183 | may = MAY_READWRITE; | |
3184 | break; | |
3185 | case IPC_INFO: | |
3186 | case SEM_INFO: | |
3187 | /* | |
3188 | * System level information | |
3189 | */ | |
3190 | return 0; | |
3191 | default: | |
3192 | return -EINVAL; | |
3193 | } | |
3194 | ||
0d79cbf8 | 3195 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3196 | } |
3197 | ||
3198 | /** | |
3199 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3200 | * @isp: the object |
e114e473 CS |
3201 | * @sops: unused |
3202 | * @nsops: unused | |
3203 | * @alter: unused | |
3204 | * | |
3205 | * Treated as read and write in all cases. | |
3206 | * | |
3207 | * Returns 0 if access is allowed, error code otherwise | |
3208 | */ | |
0d79cbf8 | 3209 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3210 | unsigned nsops, int alter) |
3211 | { | |
0d79cbf8 | 3212 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3213 | } |
3214 | ||
ecfcc53f EB |
3215 | /** |
3216 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3217 | * @isp : the msq |
ecfcc53f EB |
3218 | * @access : access requested |
3219 | * | |
3220 | * return 0 if current has access, error otherwise | |
3221 | */ | |
0d79cbf8 | 3222 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3223 | { |
0d79cbf8 | 3224 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3225 | struct smk_audit_info ad; |
d166c802 | 3226 | int rc; |
ecfcc53f EB |
3227 | |
3228 | #ifdef CONFIG_AUDIT | |
3229 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3230 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3231 | #endif |
d166c802 CS |
3232 | rc = smk_curacc(msp, access, &ad); |
3233 | rc = smk_bu_current("msq", msp, access, rc); | |
3234 | return rc; | |
ecfcc53f EB |
3235 | } |
3236 | ||
e114e473 CS |
3237 | /** |
3238 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3239 | * @isp: the object |
e114e473 CS |
3240 | * @msqflg: access requested |
3241 | * | |
3242 | * Returns 0 if current has the requested access, error code otherwise | |
3243 | */ | |
0d79cbf8 | 3244 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3245 | { |
e114e473 CS |
3246 | int may; |
3247 | ||
3248 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3249 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3250 | } |
3251 | ||
3252 | /** | |
3253 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3254 | * @isp: the object |
e114e473 CS |
3255 | * @cmd: what it wants to do |
3256 | * | |
3257 | * Returns 0 if current has the requested access, error code otherwise | |
3258 | */ | |
0d79cbf8 | 3259 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3260 | { |
e114e473 CS |
3261 | int may; |
3262 | ||
3263 | switch (cmd) { | |
3264 | case IPC_STAT: | |
3265 | case MSG_STAT: | |
23c8cec8 | 3266 | case MSG_STAT_ANY: |
e114e473 CS |
3267 | may = MAY_READ; |
3268 | break; | |
3269 | case IPC_SET: | |
3270 | case IPC_RMID: | |
3271 | may = MAY_READWRITE; | |
3272 | break; | |
3273 | case IPC_INFO: | |
3274 | case MSG_INFO: | |
3275 | /* | |
3276 | * System level information | |
3277 | */ | |
3278 | return 0; | |
3279 | default: | |
3280 | return -EINVAL; | |
3281 | } | |
3282 | ||
0d79cbf8 | 3283 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3284 | } |
3285 | ||
3286 | /** | |
3287 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3288 | * @isp: the object |
e114e473 CS |
3289 | * @msg: unused |
3290 | * @msqflg: access requested | |
3291 | * | |
3292 | * Returns 0 if current has the requested access, error code otherwise | |
3293 | */ | |
0d79cbf8 | 3294 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3295 | int msqflg) |
3296 | { | |
ecfcc53f | 3297 | int may; |
e114e473 | 3298 | |
ecfcc53f | 3299 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3300 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3301 | } |
3302 | ||
3303 | /** | |
3304 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3305 | * @isp: the object |
e114e473 CS |
3306 | * @msg: unused |
3307 | * @target: unused | |
3308 | * @type: unused | |
3309 | * @mode: unused | |
3310 | * | |
3311 | * Returns 0 if current has read and write access, error code otherwise | |
3312 | */ | |
0d79cbf8 | 3313 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3314 | struct task_struct *target, long type, int mode) |
3315 | { | |
0d79cbf8 | 3316 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3317 | } |
3318 | ||
3319 | /** | |
3320 | * smack_ipc_permission - Smack access for ipc_permission() | |
3321 | * @ipp: the object permissions | |
3322 | * @flag: access requested | |
3323 | * | |
3324 | * Returns 0 if current has read and write access, error code otherwise | |
3325 | */ | |
3326 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3327 | { | |
21c7eae2 | 3328 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3329 | int may = smack_flags_to_may(flag); |
3330 | struct smk_audit_info ad; | |
d166c802 | 3331 | int rc; |
e114e473 | 3332 | |
ecfcc53f EB |
3333 | #ifdef CONFIG_AUDIT |
3334 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3335 | ad.a.u.ipc_id = ipp->id; | |
3336 | #endif | |
21c7eae2 LP |
3337 | rc = smk_curacc(iskp, may, &ad); |
3338 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3339 | return rc; |
e114e473 CS |
3340 | } |
3341 | ||
d20bdda6 AD |
3342 | /** |
3343 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3344 | * @ipp: the object permissions |
d20bdda6 AD |
3345 | * @secid: where result will be saved |
3346 | */ | |
3347 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3348 | { | |
21c7eae2 | 3349 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3350 | |
21c7eae2 | 3351 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3352 | } |
3353 | ||
e114e473 CS |
3354 | /** |
3355 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3356 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3357 | * @inode: the object |
3358 | * | |
3359 | * Set the inode's security blob if it hasn't been done already. | |
3360 | */ | |
3361 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3362 | { | |
3363 | struct super_block *sbp; | |
3364 | struct superblock_smack *sbsp; | |
3365 | struct inode_smack *isp; | |
2f823ff8 CS |
3366 | struct smack_known *skp; |
3367 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3368 | struct smack_known *final; |
5c6d1125 JS |
3369 | char trattr[TRANS_TRUE_SIZE]; |
3370 | int transflag = 0; | |
2267b13a | 3371 | int rc; |
e114e473 CS |
3372 | struct dentry *dp; |
3373 | ||
3374 | if (inode == NULL) | |
3375 | return; | |
3376 | ||
3377 | isp = inode->i_security; | |
3378 | ||
3379 | mutex_lock(&isp->smk_lock); | |
3380 | /* | |
3381 | * If the inode is already instantiated | |
3382 | * take the quick way out | |
3383 | */ | |
3384 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3385 | goto unlockandout; | |
3386 | ||
3387 | sbp = inode->i_sb; | |
3388 | sbsp = sbp->s_security; | |
3389 | /* | |
3390 | * We're going to use the superblock default label | |
3391 | * if there's no label on the file. | |
3392 | */ | |
3393 | final = sbsp->smk_default; | |
3394 | ||
e97dcb0e CS |
3395 | /* |
3396 | * If this is the root inode the superblock | |
3397 | * may be in the process of initialization. | |
3398 | * If that is the case use the root value out | |
3399 | * of the superblock. | |
3400 | */ | |
3401 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3402 | switch (sbp->s_magic) { |
3403 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3404 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3405 | /* |
3406 | * The cgroup filesystem is never mounted, | |
3407 | * so there's no opportunity to set the mount | |
3408 | * options. | |
3409 | */ | |
21c7eae2 LP |
3410 | sbsp->smk_root = &smack_known_star; |
3411 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3412 | isp->smk_inode = sbsp->smk_root; |
3413 | break; | |
3414 | case TMPFS_MAGIC: | |
3415 | /* | |
3416 | * What about shmem/tmpfs anonymous files with dentry | |
3417 | * obtained from d_alloc_pseudo()? | |
3418 | */ | |
3419 | isp->smk_inode = smk_of_current(); | |
3420 | break; | |
8da4aba5 RK |
3421 | case PIPEFS_MAGIC: |
3422 | isp->smk_inode = smk_of_current(); | |
3423 | break; | |
805b65a8 RK |
3424 | case SOCKFS_MAGIC: |
3425 | /* | |
3426 | * Socket access is controlled by the socket | |
3427 | * structures associated with the task involved. | |
3428 | */ | |
3429 | isp->smk_inode = &smack_known_star; | |
3430 | break; | |
1d8c2326 ŁS |
3431 | default: |
3432 | isp->smk_inode = sbsp->smk_root; | |
3433 | break; | |
36ea735b | 3434 | } |
e97dcb0e CS |
3435 | isp->smk_flags |= SMK_INODE_INSTANT; |
3436 | goto unlockandout; | |
3437 | } | |
3438 | ||
e114e473 CS |
3439 | /* |
3440 | * This is pretty hackish. | |
3441 | * Casey says that we shouldn't have to do | |
3442 | * file system specific code, but it does help | |
3443 | * with keeping it simple. | |
3444 | */ | |
3445 | switch (sbp->s_magic) { | |
3446 | case SMACK_MAGIC: | |
36ea735b | 3447 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3448 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3449 | /* |
25985edc | 3450 | * Casey says that it's a little embarrassing |
e114e473 CS |
3451 | * that the smack file system doesn't do |
3452 | * extended attributes. | |
36ea735b | 3453 | * |
36ea735b | 3454 | * Cgroupfs is special |
e114e473 | 3455 | */ |
21c7eae2 | 3456 | final = &smack_known_star; |
e114e473 CS |
3457 | break; |
3458 | case DEVPTS_SUPER_MAGIC: | |
3459 | /* | |
3460 | * devpts seems content with the label of the task. | |
3461 | * Programs that change smack have to treat the | |
3462 | * pty with respect. | |
3463 | */ | |
21c7eae2 | 3464 | final = ckp; |
e114e473 | 3465 | break; |
e114e473 CS |
3466 | case PROC_SUPER_MAGIC: |
3467 | /* | |
3468 | * Casey says procfs appears not to care. | |
3469 | * The superblock default suffices. | |
3470 | */ | |
3471 | break; | |
3472 | case TMPFS_MAGIC: | |
3473 | /* | |
3474 | * Device labels should come from the filesystem, | |
3475 | * but watch out, because they're volitile, | |
3476 | * getting recreated on every reboot. | |
3477 | */ | |
21c7eae2 | 3478 | final = &smack_known_star; |
e114e473 | 3479 | /* |
b1fed3ed | 3480 | * Fall through. |
e114e473 CS |
3481 | * |
3482 | * If a smack value has been set we want to use it, | |
3483 | * but since tmpfs isn't giving us the opportunity | |
3484 | * to set mount options simulate setting the | |
3485 | * superblock default. | |
3486 | */ | |
3487 | default: | |
3488 | /* | |
3489 | * This isn't an understood special case. | |
3490 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3491 | */ |
3492 | ||
3493 | /* | |
3494 | * UNIX domain sockets use lower level socket data. | |
3495 | */ | |
3496 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3497 | final = &smack_known_star; |
b4e0d5f0 CS |
3498 | break; |
3499 | } | |
3500 | /* | |
e114e473 CS |
3501 | * No xattr support means, alas, no SMACK label. |
3502 | * Use the aforeapplied default. | |
3503 | * It would be curious if the label of the task | |
3504 | * does not match that assigned. | |
3505 | */ | |
5d6c3191 AG |
3506 | if (!(inode->i_opflags & IOP_XATTR)) |
3507 | break; | |
e114e473 CS |
3508 | /* |
3509 | * Get the dentry for xattr. | |
3510 | */ | |
3e62cbb8 | 3511 | dp = dget(opt_dentry); |
2f823ff8 | 3512 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3513 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3514 | final = skp; |
2267b13a CS |
3515 | |
3516 | /* | |
3517 | * Transmuting directory | |
3518 | */ | |
3519 | if (S_ISDIR(inode->i_mode)) { | |
3520 | /* | |
3521 | * If this is a new directory and the label was | |
3522 | * transmuted when the inode was initialized | |
3523 | * set the transmute attribute on the directory | |
3524 | * and mark the inode. | |
3525 | * | |
3526 | * If there is a transmute attribute on the | |
3527 | * directory mark the inode. | |
3528 | */ | |
3529 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3530 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
5d6c3191 | 3531 | rc = __vfs_setxattr(dp, inode, |
5c6d1125 | 3532 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3533 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3534 | 0); | |
3535 | } else { | |
5d6c3191 | 3536 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3537 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3538 | TRANS_TRUE_SIZE); | |
3539 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3540 | TRANS_TRUE_SIZE) != 0) | |
3541 | rc = -EINVAL; | |
5c6d1125 | 3542 | } |
2267b13a CS |
3543 | if (rc >= 0) |
3544 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3545 | } |
809c02e0 SF |
3546 | /* |
3547 | * Don't let the exec or mmap label be "*" or "@". | |
3548 | */ | |
3549 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3550 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3551 | skp == &smack_known_web) | |
3552 | skp = NULL; | |
3553 | isp->smk_task = skp; | |
e774ad68 | 3554 | |
19760ad0 | 3555 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3556 | if (IS_ERR(skp) || skp == &smack_known_star || |
3557 | skp == &smack_known_web) | |
19760ad0 CS |
3558 | skp = NULL; |
3559 | isp->smk_mmap = skp; | |
676dac4b | 3560 | |
e114e473 CS |
3561 | dput(dp); |
3562 | break; | |
3563 | } | |
3564 | ||
3565 | if (final == NULL) | |
21c7eae2 | 3566 | isp->smk_inode = ckp; |
e114e473 CS |
3567 | else |
3568 | isp->smk_inode = final; | |
3569 | ||
5c6d1125 | 3570 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3571 | |
3572 | unlockandout: | |
3573 | mutex_unlock(&isp->smk_lock); | |
3574 | return; | |
3575 | } | |
3576 | ||
3577 | /** | |
3578 | * smack_getprocattr - Smack process attribute access | |
3579 | * @p: the object task | |
3580 | * @name: the name of the attribute in /proc/.../attr | |
3581 | * @value: where to put the result | |
3582 | * | |
3583 | * Places a copy of the task Smack into value | |
3584 | * | |
3585 | * Returns the length of the smack label or an error code | |
3586 | */ | |
3587 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3588 | { | |
6d1cff2a | 3589 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3590 | char *cp; |
3591 | int slen; | |
3592 | ||
3593 | if (strcmp(name, "current") != 0) | |
3594 | return -EINVAL; | |
3595 | ||
2f823ff8 | 3596 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3597 | if (cp == NULL) |
3598 | return -ENOMEM; | |
3599 | ||
3600 | slen = strlen(cp); | |
3601 | *value = cp; | |
3602 | return slen; | |
3603 | } | |
3604 | ||
3605 | /** | |
3606 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3607 | * @name: the name of the attribute in /proc/.../attr |
3608 | * @value: the value to set | |
3609 | * @size: the size of the value | |
3610 | * | |
3611 | * Sets the Smack value of the task. Only setting self | |
3612 | * is permitted and only with privilege | |
3613 | * | |
3614 | * Returns the length of the smack label or an error code | |
3615 | */ | |
b21507e2 | 3616 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3617 | { |
38416e53 | 3618 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3619 | struct cred *new; |
2f823ff8 | 3620 | struct smack_known *skp; |
38416e53 ZJ |
3621 | struct smack_known_list_elem *sklep; |
3622 | int rc; | |
e114e473 | 3623 | |
38416e53 | 3624 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3625 | return -EPERM; |
3626 | ||
f7112e6c | 3627 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3628 | return -EINVAL; |
3629 | ||
3630 | if (strcmp(name, "current") != 0) | |
3631 | return -EINVAL; | |
3632 | ||
2f823ff8 | 3633 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3634 | if (IS_ERR(skp)) |
3635 | return PTR_ERR(skp); | |
e114e473 | 3636 | |
6d3dc07c | 3637 | /* |
7128ea15 HS |
3638 | * No process is ever allowed the web ("@") label |
3639 | * and the star ("*") label. | |
6d3dc07c | 3640 | */ |
7128ea15 HS |
3641 | if (skp == &smack_known_web || skp == &smack_known_star) |
3642 | return -EINVAL; | |
6d3dc07c | 3643 | |
38416e53 ZJ |
3644 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3645 | rc = -EPERM; | |
3646 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3647 | if (sklep->smk_label == skp) { | |
3648 | rc = 0; | |
3649 | break; | |
3650 | } | |
3651 | if (rc) | |
3652 | return rc; | |
3653 | } | |
3654 | ||
d84f4f99 | 3655 | new = prepare_creds(); |
6d3dc07c | 3656 | if (new == NULL) |
d84f4f99 | 3657 | return -ENOMEM; |
7898e1f8 | 3658 | |
46a2f3b9 | 3659 | tsp = new->security; |
2f823ff8 | 3660 | tsp->smk_task = skp; |
38416e53 ZJ |
3661 | /* |
3662 | * process can change its label only once | |
3663 | */ | |
3664 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3665 | |
d84f4f99 | 3666 | commit_creds(new); |
e114e473 CS |
3667 | return size; |
3668 | } | |
3669 | ||
3670 | /** | |
3671 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3672 | * @sock: one sock |
3673 | * @other: the other sock | |
e114e473 CS |
3674 | * @newsk: unused |
3675 | * | |
3676 | * Return 0 if a subject with the smack of sock could access | |
3677 | * an object with the smack of other, otherwise an error code | |
3678 | */ | |
3610cda5 DM |
3679 | static int smack_unix_stream_connect(struct sock *sock, |
3680 | struct sock *other, struct sock *newsk) | |
e114e473 | 3681 | { |
2f823ff8 | 3682 | struct smack_known *skp; |
54e70ec5 | 3683 | struct smack_known *okp; |
d2e7ad19 JM |
3684 | struct socket_smack *ssp = sock->sk_security; |
3685 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3686 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3687 | struct smk_audit_info ad; |
b4e0d5f0 | 3688 | int rc = 0; |
923e9a13 KC |
3689 | #ifdef CONFIG_AUDIT |
3690 | struct lsm_network_audit net; | |
923e9a13 | 3691 | #endif |
b4e0d5f0 | 3692 | |
2f823ff8 CS |
3693 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3694 | skp = ssp->smk_out; | |
96be7b54 | 3695 | okp = osp->smk_in; |
54e70ec5 CS |
3696 | #ifdef CONFIG_AUDIT |
3697 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3698 | smk_ad_setfield_u_net_sk(&ad, other); | |
3699 | #endif | |
21c7eae2 LP |
3700 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3701 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3702 | if (rc == 0) { |
96be7b54 ZJ |
3703 | okp = osp->smk_out; |
3704 | skp = ssp->smk_in; | |
138a868f | 3705 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3706 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3707 | MAY_WRITE, rc); |
3708 | } | |
2f823ff8 | 3709 | } |
b4e0d5f0 | 3710 | |
975d5e55 CS |
3711 | /* |
3712 | * Cross reference the peer labels for SO_PEERSEC. | |
3713 | */ | |
3714 | if (rc == 0) { | |
54e70ec5 CS |
3715 | nsp->smk_packet = ssp->smk_out; |
3716 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3717 | } |
3718 | ||
b4e0d5f0 | 3719 | return rc; |
e114e473 CS |
3720 | } |
3721 | ||
3722 | /** | |
3723 | * smack_unix_may_send - Smack access on UDS | |
3724 | * @sock: one socket | |
3725 | * @other: the other socket | |
3726 | * | |
3727 | * Return 0 if a subject with the smack of sock could access | |
3728 | * an object with the smack of other, otherwise an error code | |
3729 | */ | |
3730 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3731 | { | |
b4e0d5f0 CS |
3732 | struct socket_smack *ssp = sock->sk->sk_security; |
3733 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3734 | struct smk_audit_info ad; |
d166c802 | 3735 | int rc; |
e114e473 | 3736 | |
923e9a13 KC |
3737 | #ifdef CONFIG_AUDIT |
3738 | struct lsm_network_audit net; | |
3739 | ||
48c62af6 | 3740 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3741 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3742 | #endif |
b4e0d5f0 | 3743 | |
2f823ff8 CS |
3744 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3745 | return 0; | |
b4e0d5f0 | 3746 | |
21c7eae2 LP |
3747 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3748 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3749 | return rc; |
e114e473 CS |
3750 | } |
3751 | ||
6d3dc07c CS |
3752 | /** |
3753 | * smack_socket_sendmsg - Smack check based on destination host | |
3754 | * @sock: the socket | |
251a2a95 | 3755 | * @msg: the message |
6d3dc07c CS |
3756 | * @size: the size of the message |
3757 | * | |
c6739443 CS |
3758 | * Return 0 if the current subject can write to the destination host. |
3759 | * For IPv4 this is only a question if the destination is a single label host. | |
3760 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3761 | */ |
3762 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3763 | int size) | |
3764 | { | |
3765 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3766 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3767 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3768 | #endif |
3769 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3770 | struct socket_smack *ssp = sock->sk->sk_security; | |
3771 | struct smack_known *rsp; | |
3772 | #endif | |
c6739443 | 3773 | int rc = 0; |
6d3dc07c CS |
3774 | |
3775 | /* | |
3776 | * Perfectly reasonable for this to be NULL | |
3777 | */ | |
c6739443 | 3778 | if (sip == NULL) |
6d3dc07c CS |
3779 | return 0; |
3780 | ||
81bd0d56 | 3781 | switch (sock->sk->sk_family) { |
c6739443 CS |
3782 | case AF_INET: |
3783 | rc = smack_netlabel_send(sock->sk, sip); | |
3784 | break; | |
3785 | case AF_INET6: | |
21abb1ec CS |
3786 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3787 | rsp = smack_ipv6host_label(sap); | |
3788 | if (rsp != NULL) | |
3789 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3790 | SMK_CONNECTING); | |
3791 | #endif | |
3792 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3793 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3794 | #endif |
c6739443 CS |
3795 | break; |
3796 | } | |
3797 | return rc; | |
6d3dc07c CS |
3798 | } |
3799 | ||
e114e473 | 3800 | /** |
251a2a95 | 3801 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3802 | * @sap: netlabel secattr |
272cd7a8 | 3803 | * @ssp: socket security information |
e114e473 | 3804 | * |
2f823ff8 | 3805 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3806 | */ |
2f823ff8 CS |
3807 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3808 | struct socket_smack *ssp) | |
e114e473 | 3809 | { |
2f823ff8 | 3810 | struct smack_known *skp; |
f7112e6c | 3811 | int found = 0; |
677264e8 CS |
3812 | int acat; |
3813 | int kcat; | |
e114e473 | 3814 | |
6d3dc07c | 3815 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3816 | /* |
6d3dc07c | 3817 | * Looks like a CIPSO packet. |
e114e473 CS |
3818 | * If there are flags but no level netlabel isn't |
3819 | * behaving the way we expect it to. | |
3820 | * | |
f7112e6c | 3821 | * Look it up in the label table |
e114e473 CS |
3822 | * Without guidance regarding the smack value |
3823 | * for the packet fall back on the network | |
3824 | * ambient value. | |
3825 | */ | |
f7112e6c | 3826 | rcu_read_lock(); |
348dc288 | 3827 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3828 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3829 | continue; |
677264e8 CS |
3830 | /* |
3831 | * Compare the catsets. Use the netlbl APIs. | |
3832 | */ | |
3833 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3834 | if ((skp->smk_netlabel.flags & | |
3835 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3836 | found = 1; | |
3837 | break; | |
3838 | } | |
3839 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3840 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3841 | acat + 1); | |
3842 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3843 | skp->smk_netlabel.attr.mls.cat, |
3844 | kcat + 1); | |
3845 | if (acat < 0 || kcat < 0) | |
3846 | break; | |
3847 | } | |
3848 | if (acat == kcat) { | |
3849 | found = 1; | |
3850 | break; | |
3851 | } | |
6d3dc07c | 3852 | } |
f7112e6c CS |
3853 | rcu_read_unlock(); |
3854 | ||
3855 | if (found) | |
2f823ff8 | 3856 | return skp; |
f7112e6c | 3857 | |
54e70ec5 | 3858 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3859 | return &smack_known_web; |
3860 | return &smack_known_star; | |
e114e473 | 3861 | } |
152f91d4 | 3862 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) |
6d3dc07c CS |
3863 | /* |
3864 | * Looks like a fallback, which gives us a secid. | |
3865 | */ | |
152f91d4 | 3866 | return smack_from_secid(sap->attr.secid); |
e114e473 | 3867 | /* |
6d3dc07c CS |
3868 | * Without guidance regarding the smack value |
3869 | * for the packet fall back on the network | |
3870 | * ambient value. | |
e114e473 | 3871 | */ |
272cd7a8 | 3872 | return smack_net_ambient; |
e114e473 CS |
3873 | } |
3874 | ||
69f287ae | 3875 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3876 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3877 | { |
c6739443 CS |
3878 | u8 nexthdr; |
3879 | int offset; | |
3880 | int proto = -EINVAL; | |
3881 | struct ipv6hdr _ipv6h; | |
3882 | struct ipv6hdr *ip6; | |
3883 | __be16 frag_off; | |
3884 | struct tcphdr _tcph, *th; | |
3885 | struct udphdr _udph, *uh; | |
3886 | struct dccp_hdr _dccph, *dh; | |
3887 | ||
3888 | sip->sin6_port = 0; | |
3889 | ||
3890 | offset = skb_network_offset(skb); | |
3891 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3892 | if (ip6 == NULL) | |
3893 | return -EINVAL; | |
3894 | sip->sin6_addr = ip6->saddr; | |
3895 | ||
3896 | nexthdr = ip6->nexthdr; | |
3897 | offset += sizeof(_ipv6h); | |
3898 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3899 | if (offset < 0) | |
3900 | return -EINVAL; | |
3901 | ||
3902 | proto = nexthdr; | |
3903 | switch (proto) { | |
3904 | case IPPROTO_TCP: | |
3905 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3906 | if (th != NULL) | |
3907 | sip->sin6_port = th->source; | |
3908 | break; | |
3909 | case IPPROTO_UDP: | |
a07ef951 | 3910 | case IPPROTO_UDPLITE: |
c6739443 CS |
3911 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3912 | if (uh != NULL) | |
3913 | sip->sin6_port = uh->source; | |
3914 | break; | |
3915 | case IPPROTO_DCCP: | |
3916 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3917 | if (dh != NULL) | |
3918 | sip->sin6_port = dh->dccph_sport; | |
3919 | break; | |
3920 | } | |
3921 | return proto; | |
3922 | } | |
69f287ae | 3923 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3924 | |
e114e473 CS |
3925 | /** |
3926 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3927 | * @sk: socket | |
3928 | * @skb: packet | |
3929 | * | |
3930 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3931 | */ | |
3932 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3933 | { | |
3934 | struct netlbl_lsm_secattr secattr; | |
3935 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3936 | struct smack_known *skp = NULL; |
c6739443 | 3937 | int rc = 0; |
ecfcc53f | 3938 | struct smk_audit_info ad; |
129a9989 | 3939 | u16 family = sk->sk_family; |
923e9a13 | 3940 | #ifdef CONFIG_AUDIT |
48c62af6 | 3941 | struct lsm_network_audit net; |
923e9a13 | 3942 | #endif |
69f287ae CS |
3943 | #if IS_ENABLED(CONFIG_IPV6) |
3944 | struct sockaddr_in6 sadd; | |
3945 | int proto; | |
129a9989 PS |
3946 | |
3947 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3948 | family = PF_INET; | |
69f287ae CS |
3949 | #endif /* CONFIG_IPV6 */ |
3950 | ||
129a9989 | 3951 | switch (family) { |
c6739443 | 3952 | case PF_INET: |
69f287ae CS |
3953 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3954 | /* | |
3955 | * If there is a secmark use it rather than the CIPSO label. | |
3956 | * If there is no secmark fall back to CIPSO. | |
3957 | * The secmark is assumed to reflect policy better. | |
3958 | */ | |
3959 | if (skb && skb->secmark != 0) { | |
3960 | skp = smack_from_secid(skb->secmark); | |
3961 | goto access_check; | |
3962 | } | |
3963 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3964 | /* |
3965 | * Translate what netlabel gave us. | |
3966 | */ | |
3967 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3968 | |
129a9989 | 3969 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
c6739443 | 3970 | if (rc == 0) |
2f823ff8 | 3971 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3972 | else |
2f823ff8 | 3973 | skp = smack_net_ambient; |
6d3dc07c | 3974 | |
c6739443 | 3975 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3976 | |
69f287ae CS |
3977 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3978 | access_check: | |
3979 | #endif | |
ecfcc53f | 3980 | #ifdef CONFIG_AUDIT |
c6739443 | 3981 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 3982 | ad.a.u.net->family = family; |
c6739443 CS |
3983 | ad.a.u.net->netif = skb->skb_iif; |
3984 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3985 | #endif |
c6739443 CS |
3986 | /* |
3987 | * Receiving a packet requires that the other end | |
3988 | * be able to write here. Read access is not required. | |
3989 | * This is the simplist possible security model | |
3990 | * for networking. | |
3991 | */ | |
21c7eae2 LP |
3992 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3993 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3994 | MAY_WRITE, rc); |
c6739443 | 3995 | if (rc != 0) |
129a9989 | 3996 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 3997 | break; |
69f287ae | 3998 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3999 | case PF_INET6: |
69f287ae | 4000 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
4001 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
4002 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 4003 | break; |
21abb1ec | 4004 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
4005 | if (skb && skb->secmark != 0) |
4006 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 4007 | else |
21abb1ec CS |
4008 | skp = smack_ipv6host_label(&sadd); |
4009 | if (skp == NULL) | |
69f287ae CS |
4010 | skp = smack_net_ambient; |
4011 | #ifdef CONFIG_AUDIT | |
4012 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 4013 | ad.a.u.net->family = family; |
69f287ae CS |
4014 | ad.a.u.net->netif = skb->skb_iif; |
4015 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
4016 | #endif /* CONFIG_AUDIT */ | |
4017 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
4018 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
4019 | MAY_WRITE, rc); | |
21abb1ec CS |
4020 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
4021 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 4022 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 4023 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
4024 | if (rc != 0) |
4025 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
4026 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 4027 | break; |
69f287ae | 4028 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4029 | } |
69f287ae | 4030 | |
a8134296 | 4031 | return rc; |
e114e473 CS |
4032 | } |
4033 | ||
4034 | /** | |
4035 | * smack_socket_getpeersec_stream - pull in packet label | |
4036 | * @sock: the socket | |
4037 | * @optval: user's destination | |
4038 | * @optlen: size thereof | |
251a2a95 | 4039 | * @len: max thereof |
e114e473 CS |
4040 | * |
4041 | * returns zero on success, an error code otherwise | |
4042 | */ | |
4043 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
4044 | char __user *optval, | |
4045 | int __user *optlen, unsigned len) | |
4046 | { | |
4047 | struct socket_smack *ssp; | |
272cd7a8 CS |
4048 | char *rcp = ""; |
4049 | int slen = 1; | |
e114e473 CS |
4050 | int rc = 0; |
4051 | ||
4052 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4053 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4054 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4055 | slen = strlen(rcp) + 1; |
4056 | } | |
e114e473 CS |
4057 | |
4058 | if (slen > len) | |
4059 | rc = -ERANGE; | |
272cd7a8 | 4060 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4061 | rc = -EFAULT; |
4062 | ||
4063 | if (put_user(slen, optlen) != 0) | |
4064 | rc = -EFAULT; | |
4065 | ||
4066 | return rc; | |
4067 | } | |
4068 | ||
4069 | ||
4070 | /** | |
4071 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4072 | * @sock: the peer socket |
e114e473 CS |
4073 | * @skb: packet data |
4074 | * @secid: pointer to where to put the secid of the packet | |
4075 | * | |
4076 | * Sets the netlabel socket state on sk from parent | |
4077 | */ | |
4078 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4079 | struct sk_buff *skb, u32 *secid) | |
4080 | ||
4081 | { | |
4082 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4083 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4084 | struct smack_known *skp; |
b4e0d5f0 CS |
4085 | int family = PF_UNSPEC; |
4086 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4087 | int rc; |
4088 | ||
b4e0d5f0 CS |
4089 | if (skb != NULL) { |
4090 | if (skb->protocol == htons(ETH_P_IP)) | |
4091 | family = PF_INET; | |
69f287ae | 4092 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4093 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4094 | family = PF_INET6; | |
69f287ae | 4095 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4096 | } |
b4e0d5f0 CS |
4097 | if (family == PF_UNSPEC && sock != NULL) |
4098 | family = sock->sk->sk_family; | |
e114e473 | 4099 | |
69f287ae CS |
4100 | switch (family) { |
4101 | case PF_UNIX: | |
272cd7a8 | 4102 | ssp = sock->sk->sk_security; |
2f823ff8 | 4103 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4104 | break; |
4105 | case PF_INET: | |
4106 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4107 | s = skb->secmark; | |
4108 | if (s != 0) | |
4109 | break; | |
4110 | #endif | |
b4e0d5f0 CS |
4111 | /* |
4112 | * Translate what netlabel gave us. | |
4113 | */ | |
272cd7a8 CS |
4114 | if (sock != NULL && sock->sk != NULL) |
4115 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4116 | netlbl_secattr_init(&secattr); |
4117 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4118 | if (rc == 0) { | |
2f823ff8 CS |
4119 | skp = smack_from_secattr(&secattr, ssp); |
4120 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4121 | } |
4122 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4123 | break; |
69f287ae | 4124 | case PF_INET6: |
21abb1ec | 4125 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4126 | s = skb->secmark; |
21abb1ec | 4127 | #endif |
69f287ae | 4128 | break; |
b4e0d5f0 CS |
4129 | } |
4130 | *secid = s; | |
e114e473 CS |
4131 | if (s == 0) |
4132 | return -EINVAL; | |
e114e473 CS |
4133 | return 0; |
4134 | } | |
4135 | ||
4136 | /** | |
07feee8f PM |
4137 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4138 | * @sk: child sock | |
4139 | * @parent: parent socket | |
e114e473 | 4140 | * |
07feee8f PM |
4141 | * Set the smk_{in,out} state of an existing sock based on the process that |
4142 | * is creating the new socket. | |
e114e473 CS |
4143 | */ |
4144 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4145 | { | |
4146 | struct socket_smack *ssp; | |
2f823ff8 | 4147 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4148 | |
07feee8f PM |
4149 | if (sk == NULL || |
4150 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4151 | return; |
4152 | ||
4153 | ssp = sk->sk_security; | |
54e70ec5 | 4154 | ssp->smk_in = skp; |
2f823ff8 | 4155 | ssp->smk_out = skp; |
07feee8f | 4156 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4157 | } |
4158 | ||
4159 | /** | |
4160 | * smack_inet_conn_request - Smack access check on connect | |
4161 | * @sk: socket involved | |
4162 | * @skb: packet | |
4163 | * @req: unused | |
4164 | * | |
4165 | * Returns 0 if a task with the packet label could write to | |
4166 | * the socket, otherwise an error code | |
4167 | */ | |
4168 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4169 | struct request_sock *req) | |
4170 | { | |
07feee8f | 4171 | u16 family = sk->sk_family; |
f7112e6c | 4172 | struct smack_known *skp; |
e114e473 | 4173 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4174 | struct netlbl_lsm_secattr secattr; |
4175 | struct sockaddr_in addr; | |
4176 | struct iphdr *hdr; | |
21c7eae2 | 4177 | struct smack_known *hskp; |
e114e473 | 4178 | int rc; |
ecfcc53f | 4179 | struct smk_audit_info ad; |
923e9a13 | 4180 | #ifdef CONFIG_AUDIT |
48c62af6 | 4181 | struct lsm_network_audit net; |
923e9a13 | 4182 | #endif |
e114e473 | 4183 | |
69f287ae | 4184 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4185 | if (family == PF_INET6) { |
4186 | /* | |
4187 | * Handle mapped IPv4 packets arriving | |
4188 | * via IPv6 sockets. Don't set up netlabel | |
4189 | * processing on IPv6. | |
4190 | */ | |
4191 | if (skb->protocol == htons(ETH_P_IP)) | |
4192 | family = PF_INET; | |
4193 | else | |
4194 | return 0; | |
4195 | } | |
69f287ae | 4196 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4197 | |
7f368ad3 CS |
4198 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4199 | /* | |
4200 | * If there is a secmark use it rather than the CIPSO label. | |
4201 | * If there is no secmark fall back to CIPSO. | |
4202 | * The secmark is assumed to reflect policy better. | |
4203 | */ | |
4204 | if (skb && skb->secmark != 0) { | |
4205 | skp = smack_from_secid(skb->secmark); | |
4206 | goto access_check; | |
4207 | } | |
4208 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4209 | ||
07feee8f PM |
4210 | netlbl_secattr_init(&secattr); |
4211 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4212 | if (rc == 0) |
2f823ff8 | 4213 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4214 | else |
2f823ff8 | 4215 | skp = &smack_known_huh; |
07feee8f PM |
4216 | netlbl_secattr_destroy(&secattr); |
4217 | ||
7f368ad3 CS |
4218 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4219 | access_check: | |
4220 | #endif | |
4221 | ||
ecfcc53f | 4222 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4223 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4224 | ad.a.u.net->family = family; | |
4225 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4226 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4227 | #endif | |
e114e473 | 4228 | /* |
07feee8f PM |
4229 | * Receiving a packet requires that the other end be able to write |
4230 | * here. Read access is not required. | |
e114e473 | 4231 | */ |
21c7eae2 LP |
4232 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4233 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4234 | if (rc != 0) |
4235 | return rc; | |
4236 | ||
4237 | /* | |
4238 | * Save the peer's label in the request_sock so we can later setup | |
4239 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4240 | */ | |
2f823ff8 | 4241 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4242 | |
4243 | /* | |
4244 | * We need to decide if we want to label the incoming connection here | |
4245 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4246 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4247 | */ |
4248 | hdr = ip_hdr(skb); | |
4249 | addr.sin_addr.s_addr = hdr->saddr; | |
4250 | rcu_read_lock(); | |
21abb1ec | 4251 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4252 | rcu_read_unlock(); |
4253 | ||
21c7eae2 | 4254 | if (hskp == NULL) |
f7112e6c | 4255 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4256 | else |
07feee8f | 4257 | netlbl_req_delattr(req); |
e114e473 CS |
4258 | |
4259 | return rc; | |
4260 | } | |
4261 | ||
07feee8f PM |
4262 | /** |
4263 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4264 | * @sk: the new socket | |
4265 | * @req: the connection's request_sock | |
4266 | * | |
4267 | * Transfer the connection's peer label to the newly created socket. | |
4268 | */ | |
4269 | static void smack_inet_csk_clone(struct sock *sk, | |
4270 | const struct request_sock *req) | |
4271 | { | |
4272 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4273 | struct smack_known *skp; |
07feee8f | 4274 | |
2f823ff8 CS |
4275 | if (req->peer_secid != 0) { |
4276 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4277 | ssp->smk_packet = skp; |
2f823ff8 | 4278 | } else |
272cd7a8 | 4279 | ssp->smk_packet = NULL; |
07feee8f PM |
4280 | } |
4281 | ||
e114e473 CS |
4282 | /* |
4283 | * Key management security hooks | |
4284 | * | |
4285 | * Casey has not tested key support very heavily. | |
4286 | * The permission check is most likely too restrictive. | |
4287 | * If you care about keys please have a look. | |
4288 | */ | |
4289 | #ifdef CONFIG_KEYS | |
4290 | ||
4291 | /** | |
4292 | * smack_key_alloc - Set the key security blob | |
4293 | * @key: object | |
d84f4f99 | 4294 | * @cred: the credentials to use |
e114e473 CS |
4295 | * @flags: unused |
4296 | * | |
4297 | * No allocation required | |
4298 | * | |
4299 | * Returns 0 | |
4300 | */ | |
d84f4f99 | 4301 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4302 | unsigned long flags) |
4303 | { | |
2f823ff8 CS |
4304 | struct smack_known *skp = smk_of_task(cred->security); |
4305 | ||
21c7eae2 | 4306 | key->security = skp; |
e114e473 CS |
4307 | return 0; |
4308 | } | |
4309 | ||
4310 | /** | |
4311 | * smack_key_free - Clear the key security blob | |
4312 | * @key: the object | |
4313 | * | |
4314 | * Clear the blob pointer | |
4315 | */ | |
4316 | static void smack_key_free(struct key *key) | |
4317 | { | |
4318 | key->security = NULL; | |
4319 | } | |
4320 | ||
1a28979b | 4321 | /** |
e114e473 CS |
4322 | * smack_key_permission - Smack access on a key |
4323 | * @key_ref: gets to the object | |
d84f4f99 | 4324 | * @cred: the credentials to use |
1a28979b | 4325 | * @perm: requested key permissions |
e114e473 CS |
4326 | * |
4327 | * Return 0 if the task has read and write to the object, | |
4328 | * an error code otherwise | |
4329 | */ | |
4330 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4331 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4332 | { |
4333 | struct key *keyp; | |
ecfcc53f | 4334 | struct smk_audit_info ad; |
2f823ff8 | 4335 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4336 | int request = 0; |
d166c802 | 4337 | int rc; |
e114e473 | 4338 | |
5b841bfa ZM |
4339 | /* |
4340 | * Validate requested permissions | |
4341 | */ | |
4342 | if (perm & ~KEY_NEED_ALL) | |
4343 | return -EINVAL; | |
4344 | ||
e114e473 CS |
4345 | keyp = key_ref_to_ptr(key_ref); |
4346 | if (keyp == NULL) | |
4347 | return -EINVAL; | |
4348 | /* | |
4349 | * If the key hasn't been initialized give it access so that | |
4350 | * it may do so. | |
4351 | */ | |
4352 | if (keyp->security == NULL) | |
4353 | return 0; | |
4354 | /* | |
4355 | * This should not occur | |
4356 | */ | |
2f823ff8 | 4357 | if (tkp == NULL) |
e114e473 | 4358 | return -EACCES; |
d19dfe58 CS |
4359 | |
4360 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) | |
4361 | return 0; | |
4362 | ||
ecfcc53f EB |
4363 | #ifdef CONFIG_AUDIT |
4364 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4365 | ad.a.u.key_struct.key = keyp->serial; | |
4366 | ad.a.u.key_struct.key_desc = keyp->description; | |
4367 | #endif | |
5b841bfa ZM |
4368 | if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW)) |
4369 | request |= MAY_READ; | |
fffea214 | 4370 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) |
5b841bfa | 4371 | request |= MAY_WRITE; |
d166c802 CS |
4372 | rc = smk_access(tkp, keyp->security, request, &ad); |
4373 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4374 | return rc; | |
e114e473 | 4375 | } |
7fc5f36e JB |
4376 | |
4377 | /* | |
4378 | * smack_key_getsecurity - Smack label tagging the key | |
4379 | * @key points to the key to be queried | |
4380 | * @_buffer points to a pointer that should be set to point to the | |
4381 | * resulting string (if no label or an error occurs). | |
4382 | * Return the length of the string (including terminating NUL) or -ve if | |
4383 | * an error. | |
4384 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4385 | */ | |
4386 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4387 | { | |
4388 | struct smack_known *skp = key->security; | |
4389 | size_t length; | |
4390 | char *copy; | |
4391 | ||
4392 | if (key->security == NULL) { | |
4393 | *_buffer = NULL; | |
4394 | return 0; | |
4395 | } | |
4396 | ||
4397 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4398 | if (copy == NULL) | |
4399 | return -ENOMEM; | |
4400 | length = strlen(copy) + 1; | |
4401 | ||
4402 | *_buffer = copy; | |
4403 | return length; | |
4404 | } | |
4405 | ||
e114e473 CS |
4406 | #endif /* CONFIG_KEYS */ |
4407 | ||
d20bdda6 AD |
4408 | /* |
4409 | * Smack Audit hooks | |
4410 | * | |
4411 | * Audit requires a unique representation of each Smack specific | |
4412 | * rule. This unique representation is used to distinguish the | |
4413 | * object to be audited from remaining kernel objects and also | |
4414 | * works as a glue between the audit hooks. | |
4415 | * | |
4416 | * Since repository entries are added but never deleted, we'll use | |
4417 | * the smack_known label address related to the given audit rule as | |
4418 | * the needed unique representation. This also better fits the smack | |
4419 | * model where nearly everything is a label. | |
4420 | */ | |
4421 | #ifdef CONFIG_AUDIT | |
4422 | ||
4423 | /** | |
4424 | * smack_audit_rule_init - Initialize a smack audit rule | |
4425 | * @field: audit rule fields given from user-space (audit.h) | |
4426 | * @op: required testing operator (=, !=, >, <, ...) | |
4427 | * @rulestr: smack label to be audited | |
4428 | * @vrule: pointer to save our own audit rule representation | |
4429 | * | |
4430 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4431 | * The label to be audited is created if necessay. | |
4432 | */ | |
4433 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4434 | { | |
21c7eae2 | 4435 | struct smack_known *skp; |
d20bdda6 AD |
4436 | char **rule = (char **)vrule; |
4437 | *rule = NULL; | |
4438 | ||
4439 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4440 | return -EINVAL; | |
4441 | ||
5af75d8d | 4442 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4443 | return -EINVAL; |
4444 | ||
21c7eae2 | 4445 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4446 | if (IS_ERR(skp)) |
4447 | return PTR_ERR(skp); | |
4448 | ||
4449 | *rule = skp->smk_known; | |
d20bdda6 AD |
4450 | |
4451 | return 0; | |
4452 | } | |
4453 | ||
4454 | /** | |
4455 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4456 | * @krule: rule of interest, in Audit kernel representation format | |
4457 | * | |
4458 | * This is used to filter Smack rules from remaining Audit ones. | |
4459 | * If it's proved that this rule belongs to us, the | |
4460 | * audit_rule_match hook will be called to do the final judgement. | |
4461 | */ | |
4462 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4463 | { | |
4464 | struct audit_field *f; | |
4465 | int i; | |
4466 | ||
4467 | for (i = 0; i < krule->field_count; i++) { | |
4468 | f = &krule->fields[i]; | |
4469 | ||
4470 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4471 | return 1; | |
4472 | } | |
4473 | ||
4474 | return 0; | |
4475 | } | |
4476 | ||
4477 | /** | |
4478 | * smack_audit_rule_match - Audit given object ? | |
4479 | * @secid: security id for identifying the object to test | |
4480 | * @field: audit rule flags given from user-space | |
4481 | * @op: required testing operator | |
4482 | * @vrule: smack internal rule presentation | |
4483 | * @actx: audit context associated with the check | |
4484 | * | |
4485 | * The core Audit hook. It's used to take the decision of | |
4486 | * whether to audit or not to audit a given object. | |
4487 | */ | |
4488 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4489 | struct audit_context *actx) | |
4490 | { | |
2f823ff8 | 4491 | struct smack_known *skp; |
d20bdda6 AD |
4492 | char *rule = vrule; |
4493 | ||
4eb0f4ab RGB |
4494 | if (unlikely(!rule)) { |
4495 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4496 | return -ENOENT; |
4497 | } | |
4498 | ||
4499 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4500 | return 0; | |
4501 | ||
2f823ff8 | 4502 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4503 | |
4504 | /* | |
4505 | * No need to do string comparisons. If a match occurs, | |
4506 | * both pointers will point to the same smack_known | |
4507 | * label. | |
4508 | */ | |
5af75d8d | 4509 | if (op == Audit_equal) |
2f823ff8 | 4510 | return (rule == skp->smk_known); |
5af75d8d | 4511 | if (op == Audit_not_equal) |
2f823ff8 | 4512 | return (rule != skp->smk_known); |
d20bdda6 AD |
4513 | |
4514 | return 0; | |
4515 | } | |
4516 | ||
491a0b08 CS |
4517 | /* |
4518 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4519 | * No memory was allocated. |
4520 | */ | |
d20bdda6 AD |
4521 | |
4522 | #endif /* CONFIG_AUDIT */ | |
4523 | ||
746df9b5 DQ |
4524 | /** |
4525 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4526 | * @name: Full xattr name to check. | |
4527 | */ | |
4528 | static int smack_ismaclabel(const char *name) | |
4529 | { | |
4530 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4531 | } | |
4532 | ||
4533 | ||
251a2a95 | 4534 | /** |
e114e473 CS |
4535 | * smack_secid_to_secctx - return the smack label for a secid |
4536 | * @secid: incoming integer | |
4537 | * @secdata: destination | |
4538 | * @seclen: how long it is | |
4539 | * | |
4540 | * Exists for networking code. | |
4541 | */ | |
4542 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4543 | { | |
2f823ff8 | 4544 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4545 | |
d5630b9d | 4546 | if (secdata) |
2f823ff8 CS |
4547 | *secdata = skp->smk_known; |
4548 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4549 | return 0; |
4550 | } | |
4551 | ||
251a2a95 | 4552 | /** |
4bc87e62 CS |
4553 | * smack_secctx_to_secid - return the secid for a smack label |
4554 | * @secdata: smack label | |
4555 | * @seclen: how long result is | |
4556 | * @secid: outgoing integer | |
4557 | * | |
4558 | * Exists for audit and networking code. | |
4559 | */ | |
e52c1764 | 4560 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4561 | { |
21c7eae2 LP |
4562 | struct smack_known *skp = smk_find_entry(secdata); |
4563 | ||
4564 | if (skp) | |
4565 | *secid = skp->smk_secid; | |
4566 | else | |
4567 | *secid = 0; | |
4bc87e62 CS |
4568 | return 0; |
4569 | } | |
4570 | ||
491a0b08 CS |
4571 | /* |
4572 | * There used to be a smack_release_secctx hook | |
4573 | * that did nothing back when hooks were in a vector. | |
4574 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4575 | */ |
e114e473 | 4576 | |
1ee65e37 DQ |
4577 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4578 | { | |
4579 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4580 | } | |
4581 | ||
4582 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4583 | { | |
4584 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4585 | } | |
4586 | ||
4587 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4588 | { | |
0f8983cf | 4589 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4590 | |
0f8983cf CS |
4591 | *ctx = skp->smk_known; |
4592 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4593 | return 0; |
4594 | } | |
4595 | ||
d6d80cb5 CS |
4596 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4597 | { | |
4598 | ||
4599 | struct task_smack *tsp; | |
4600 | struct smack_known *skp; | |
4601 | struct inode_smack *isp; | |
4602 | struct cred *new_creds = *new; | |
4603 | ||
4604 | if (new_creds == NULL) { | |
4605 | new_creds = prepare_creds(); | |
4606 | if (new_creds == NULL) | |
4607 | return -ENOMEM; | |
4608 | } | |
4609 | ||
4610 | tsp = new_creds->security; | |
4611 | ||
4612 | /* | |
4613 | * Get label from overlay inode and set it in create_sid | |
4614 | */ | |
4615 | isp = d_inode(dentry->d_parent)->i_security; | |
4616 | skp = isp->smk_inode; | |
4617 | tsp->smk_task = skp; | |
4618 | *new = new_creds; | |
4619 | return 0; | |
4620 | } | |
4621 | ||
4622 | static int smack_inode_copy_up_xattr(const char *name) | |
4623 | { | |
4624 | /* | |
4625 | * Return 1 if this is the smack access Smack attribute. | |
4626 | */ | |
4627 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4628 | return 1; | |
4629 | ||
4630 | return -EOPNOTSUPP; | |
4631 | } | |
4632 | ||
4633 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4634 | struct qstr *name, | |
4635 | const struct cred *old, | |
4636 | struct cred *new) | |
4637 | { | |
4638 | struct task_smack *otsp = old->security; | |
4639 | struct task_smack *ntsp = new->security; | |
4640 | struct inode_smack *isp; | |
4641 | int may; | |
4642 | ||
4643 | /* | |
4644 | * Use the process credential unless all of | |
4645 | * the transmuting criteria are met | |
4646 | */ | |
4647 | ntsp->smk_task = otsp->smk_task; | |
4648 | ||
4649 | /* | |
4650 | * the attribute of the containing directory | |
4651 | */ | |
4652 | isp = d_inode(dentry->d_parent)->i_security; | |
4653 | ||
4654 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4655 | rcu_read_lock(); | |
4656 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4657 | isp->smk_inode->smk_known, | |
4658 | &otsp->smk_task->smk_rules); | |
4659 | rcu_read_unlock(); | |
4660 | ||
4661 | /* | |
4662 | * If the directory is transmuting and the rule | |
4663 | * providing access is transmuting use the containing | |
4664 | * directory label instead of the process label. | |
4665 | */ | |
4666 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4667 | ntsp->smk_task = isp->smk_inode; | |
4668 | } | |
4669 | return 0; | |
4670 | } | |
4671 | ||
ca97d939 | 4672 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4673 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4674 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4675 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4676 | ||
0b52075e | 4677 | LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup), |
2febd254 DH |
4678 | LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param), |
4679 | ||
e20b043a CS |
4680 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), |
4681 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
204cc0cc | 4682 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 4683 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 4684 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 4685 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a CS |
4686 | |
4687 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
e20b043a CS |
4688 | |
4689 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4690 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4691 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4692 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4693 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4694 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4695 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4696 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4697 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4698 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4699 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4700 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4701 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4702 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4703 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4704 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4705 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4706 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4707 | ||
e20b043a CS |
4708 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4709 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4710 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4711 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4712 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4713 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4714 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4715 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4716 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4717 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4718 | ||
4719 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4720 | ||
4721 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4722 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4723 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4724 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4725 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4726 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4727 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4728 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4729 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4730 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4731 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4732 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4733 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4734 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4735 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4736 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4737 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4738 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4739 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4740 | ||
4741 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4742 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4743 | ||
4744 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4745 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4746 | ||
0d79cbf8 EB |
4747 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
4748 | LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security), | |
e20b043a CS |
4749 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4750 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4751 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4752 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4753 | ||
0d79cbf8 EB |
4754 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
4755 | LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security), | |
e20b043a CS |
4756 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4757 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4758 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4759 | ||
0d79cbf8 EB |
4760 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
4761 | LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security), | |
e20b043a CS |
4762 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4763 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4764 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4765 | ||
4766 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4767 | ||
4768 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4769 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4770 | ||
4771 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4772 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4773 | ||
4774 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4775 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4776 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4777 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4778 | #endif |
e20b043a CS |
4779 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4780 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4781 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4782 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4783 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4784 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4785 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4786 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4787 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4788 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4789 | |
e114e473 CS |
4790 | /* key management security hooks */ |
4791 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4792 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4793 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4794 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4795 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4796 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4797 | |
4798 | /* Audit hooks */ | |
4799 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4800 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4801 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4802 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4803 | #endif /* CONFIG_AUDIT */ |
4804 | ||
e20b043a CS |
4805 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4806 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4807 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4808 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4809 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4810 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4811 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4812 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4813 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4814 | }; |
4815 | ||
7198e2ee | 4816 | |
86812bb0 | 4817 | static __init void init_smack_known_list(void) |
7198e2ee | 4818 | { |
86812bb0 CS |
4819 | /* |
4820 | * Initialize rule list locks | |
4821 | */ | |
4822 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4823 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4824 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4825 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4826 | mutex_init(&smack_known_web.smk_rules_lock); |
4827 | /* | |
4828 | * Initialize rule lists | |
4829 | */ | |
4830 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4831 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4832 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4833 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4834 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4835 | /* | |
4836 | * Create the known labels list | |
4837 | */ | |
4d7cf4a1 TS |
4838 | smk_insert_entry(&smack_known_huh); |
4839 | smk_insert_entry(&smack_known_hat); | |
4840 | smk_insert_entry(&smack_known_star); | |
4841 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4842 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4843 | } |
4844 | ||
e114e473 CS |
4845 | /** |
4846 | * smack_init - initialize the smack system | |
4847 | * | |
4848 | * Returns 0 | |
4849 | */ | |
4850 | static __init int smack_init(void) | |
4851 | { | |
d84f4f99 | 4852 | struct cred *cred; |
676dac4b | 4853 | struct task_smack *tsp; |
d84f4f99 | 4854 | |
b1d9e6b0 | 4855 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4856 | return 0; |
4857 | ||
1a5b472b R |
4858 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4859 | if (!smack_inode_cache) | |
4860 | return -ENOMEM; | |
4861 | ||
2f823ff8 CS |
4862 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4863 | GFP_KERNEL); | |
1a5b472b R |
4864 | if (tsp == NULL) { |
4865 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4866 | return -ENOMEM; |
1a5b472b | 4867 | } |
676dac4b | 4868 | |
d21b7b04 JB |
4869 | smack_enabled = 1; |
4870 | ||
21abb1ec CS |
4871 | pr_info("Smack: Initializing.\n"); |
4872 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4873 | pr_info("Smack: Netfilter enabled.\n"); | |
4874 | #endif | |
4875 | #ifdef SMACK_IPV6_PORT_LABELING | |
4876 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4877 | #endif | |
4878 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4879 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4880 | #endif | |
e114e473 CS |
4881 | |
4882 | /* | |
4883 | * Set the security state for the initial task. | |
4884 | */ | |
d84f4f99 | 4885 | cred = (struct cred *) current->cred; |
676dac4b | 4886 | cred->security = tsp; |
e114e473 | 4887 | |
86812bb0 CS |
4888 | /* initialize the smack_known_list */ |
4889 | init_smack_known_list(); | |
e114e473 CS |
4890 | |
4891 | /* | |
4892 | * Register with LSM | |
4893 | */ | |
d69dece5 | 4894 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); |
e114e473 CS |
4895 | |
4896 | return 0; | |
4897 | } | |
4898 | ||
4899 | /* | |
4900 | * Smack requires early initialization in order to label | |
4901 | * all processes and objects when they are created. | |
4902 | */ | |
3d6e5f6d | 4903 | DEFINE_LSM(smack) = { |
07aed2f2 | 4904 | .name = "smack", |
3d6e5f6d KC |
4905 | .init = smack_init, |
4906 | }; |