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> |
5c6d1125 | 8 | * Jarkko Sakkinen <ext-jarkko.2.sakkinen@nokia.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f PM |
11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
12 | * Paul Moore <paul.moore@hp.com> | |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
e114e473 CS |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License version 2, | |
17 | * as published by the Free Software Foundation. | |
18 | */ | |
19 | ||
20 | #include <linux/xattr.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/mount.h> | |
23 | #include <linux/stat.h> | |
e114e473 CS |
24 | #include <linux/kd.h> |
25 | #include <asm/ioctls.h> | |
07feee8f | 26 | #include <linux/ip.h> |
e114e473 CS |
27 | #include <linux/tcp.h> |
28 | #include <linux/udp.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
e114e473 CS |
30 | #include <linux/mutex.h> |
31 | #include <linux/pipe_fs_i.h> | |
32 | #include <net/netlabel.h> | |
33 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 34 | #include <linux/audit.h> |
1fd7317d | 35 | #include <linux/magic.h> |
e114e473 CS |
36 | #include "smack.h" |
37 | ||
c69e8d9c DH |
38 | #define task_security(task) (task_cred_xxx((task), security)) |
39 | ||
5c6d1125 JS |
40 | #define TRANS_TRUE "TRUE" |
41 | #define TRANS_TRUE_SIZE 4 | |
42 | ||
e114e473 CS |
43 | /** |
44 | * smk_fetch - Fetch the smack label from a file. | |
45 | * @ip: a pointer to the inode | |
46 | * @dp: a pointer to the dentry | |
47 | * | |
48 | * Returns a pointer to the master list entry for the Smack label | |
49 | * or NULL if there was no label to fetch. | |
50 | */ | |
676dac4b | 51 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
52 | { |
53 | int rc; | |
54 | char in[SMK_LABELLEN]; | |
55 | ||
56 | if (ip->i_op->getxattr == NULL) | |
57 | return NULL; | |
58 | ||
676dac4b | 59 | rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); |
e114e473 CS |
60 | if (rc < 0) |
61 | return NULL; | |
62 | ||
63 | return smk_import(in, rc); | |
64 | } | |
65 | ||
66 | /** | |
67 | * new_inode_smack - allocate an inode security blob | |
68 | * @smack: a pointer to the Smack label to use in the blob | |
69 | * | |
70 | * Returns the new blob or NULL if there's no memory available | |
71 | */ | |
72 | struct inode_smack *new_inode_smack(char *smack) | |
73 | { | |
74 | struct inode_smack *isp; | |
75 | ||
76 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
77 | if (isp == NULL) | |
78 | return NULL; | |
79 | ||
80 | isp->smk_inode = smack; | |
81 | isp->smk_flags = 0; | |
82 | mutex_init(&isp->smk_lock); | |
83 | ||
84 | return isp; | |
85 | } | |
86 | ||
7898e1f8 CS |
87 | /** |
88 | * new_task_smack - allocate a task security blob | |
89 | * @smack: a pointer to the Smack label to use in the blob | |
90 | * | |
91 | * Returns the new blob or NULL if there's no memory available | |
92 | */ | |
93 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
94 | { | |
95 | struct task_smack *tsp; | |
96 | ||
97 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
98 | if (tsp == NULL) | |
99 | return NULL; | |
100 | ||
101 | tsp->smk_task = task; | |
102 | tsp->smk_forked = forked; | |
103 | INIT_LIST_HEAD(&tsp->smk_rules); | |
104 | mutex_init(&tsp->smk_rules_lock); | |
105 | ||
106 | return tsp; | |
107 | } | |
108 | ||
109 | /** | |
110 | * smk_copy_rules - copy a rule set | |
111 | * @nhead - new rules header pointer | |
112 | * @ohead - old rules header pointer | |
113 | * | |
114 | * Returns 0 on success, -ENOMEM on error | |
115 | */ | |
116 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
117 | gfp_t gfp) | |
118 | { | |
119 | struct smack_rule *nrp; | |
120 | struct smack_rule *orp; | |
121 | int rc = 0; | |
122 | ||
123 | INIT_LIST_HEAD(nhead); | |
124 | ||
125 | list_for_each_entry_rcu(orp, ohead, list) { | |
126 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
127 | if (nrp == NULL) { | |
128 | rc = -ENOMEM; | |
129 | break; | |
130 | } | |
131 | *nrp = *orp; | |
132 | list_add_rcu(&nrp->list, nhead); | |
133 | } | |
134 | return rc; | |
135 | } | |
136 | ||
e114e473 CS |
137 | /* |
138 | * LSM hooks. | |
139 | * We he, that is fun! | |
140 | */ | |
141 | ||
142 | /** | |
9e48858f | 143 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 144 | * @ctp: child task pointer |
251a2a95 | 145 | * @mode: ptrace attachment mode |
e114e473 CS |
146 | * |
147 | * Returns 0 if access is OK, an error code otherwise | |
148 | * | |
149 | * Do the capability checks, and require read and write. | |
150 | */ | |
9e48858f | 151 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
152 | { |
153 | int rc; | |
ecfcc53f | 154 | struct smk_audit_info ad; |
7898e1f8 | 155 | char *tsp; |
e114e473 | 156 | |
9e48858f | 157 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
158 | if (rc != 0) |
159 | return rc; | |
160 | ||
676dac4b | 161 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
162 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
163 | smk_ad_setfield_u_tsk(&ad, ctp); | |
164 | ||
7898e1f8 | 165 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
166 | return rc; |
167 | } | |
168 | ||
169 | /** | |
170 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
171 | * @ptp: parent task pointer | |
172 | * | |
173 | * Returns 0 if access is OK, an error code otherwise | |
174 | * | |
175 | * Do the capability checks, and require read and write. | |
176 | */ | |
177 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
178 | { | |
179 | int rc; | |
ecfcc53f | 180 | struct smk_audit_info ad; |
7898e1f8 | 181 | char *tsp; |
5cd9c58f DH |
182 | |
183 | rc = cap_ptrace_traceme(ptp); | |
184 | if (rc != 0) | |
185 | return rc; | |
e114e473 | 186 | |
7898e1f8 | 187 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
188 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
189 | smk_ad_setfield_u_tsk(&ad, ptp); | |
190 | ||
7898e1f8 | 191 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
192 | return rc; |
193 | } | |
194 | ||
195 | /** | |
196 | * smack_syslog - Smack approval on syslog | |
197 | * @type: message type | |
198 | * | |
199 | * Require that the task has the floor label | |
200 | * | |
201 | * Returns 0 on success, error code otherwise. | |
202 | */ | |
12b3052c | 203 | static int smack_syslog(int typefrom_file) |
e114e473 | 204 | { |
12b3052c | 205 | int rc = 0; |
676dac4b | 206 | char *sp = smk_of_current(); |
e114e473 | 207 | |
e114e473 CS |
208 | if (capable(CAP_MAC_OVERRIDE)) |
209 | return 0; | |
210 | ||
211 | if (sp != smack_known_floor.smk_known) | |
212 | rc = -EACCES; | |
213 | ||
214 | return rc; | |
215 | } | |
216 | ||
217 | ||
218 | /* | |
219 | * Superblock Hooks. | |
220 | */ | |
221 | ||
222 | /** | |
223 | * smack_sb_alloc_security - allocate a superblock blob | |
224 | * @sb: the superblock getting the blob | |
225 | * | |
226 | * Returns 0 on success or -ENOMEM on error. | |
227 | */ | |
228 | static int smack_sb_alloc_security(struct super_block *sb) | |
229 | { | |
230 | struct superblock_smack *sbsp; | |
231 | ||
232 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
233 | ||
234 | if (sbsp == NULL) | |
235 | return -ENOMEM; | |
236 | ||
237 | sbsp->smk_root = smack_known_floor.smk_known; | |
238 | sbsp->smk_default = smack_known_floor.smk_known; | |
239 | sbsp->smk_floor = smack_known_floor.smk_known; | |
240 | sbsp->smk_hat = smack_known_hat.smk_known; | |
241 | sbsp->smk_initialized = 0; | |
242 | spin_lock_init(&sbsp->smk_sblock); | |
243 | ||
244 | sb->s_security = sbsp; | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | /** | |
250 | * smack_sb_free_security - free a superblock blob | |
251 | * @sb: the superblock getting the blob | |
252 | * | |
253 | */ | |
254 | static void smack_sb_free_security(struct super_block *sb) | |
255 | { | |
256 | kfree(sb->s_security); | |
257 | sb->s_security = NULL; | |
258 | } | |
259 | ||
260 | /** | |
261 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 262 | * @orig: where to start |
251a2a95 | 263 | * @smackopts: mount options string |
e114e473 CS |
264 | * |
265 | * Returns 0 on success or -ENOMEM on error. | |
266 | * | |
267 | * Copy the Smack specific mount options out of the mount | |
268 | * options list. | |
269 | */ | |
e0007529 | 270 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
271 | { |
272 | char *cp, *commap, *otheropts, *dp; | |
273 | ||
e114e473 CS |
274 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
275 | if (otheropts == NULL) | |
276 | return -ENOMEM; | |
277 | ||
278 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
279 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
280 | dp = smackopts; | |
281 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
282 | dp = smackopts; | |
283 | else if (strstr(cp, SMK_FSHAT) == cp) | |
284 | dp = smackopts; | |
285 | else if (strstr(cp, SMK_FSROOT) == cp) | |
286 | dp = smackopts; | |
287 | else | |
288 | dp = otheropts; | |
289 | ||
290 | commap = strchr(cp, ','); | |
291 | if (commap != NULL) | |
292 | *commap = '\0'; | |
293 | ||
294 | if (*dp != '\0') | |
295 | strcat(dp, ","); | |
296 | strcat(dp, cp); | |
297 | } | |
298 | ||
299 | strcpy(orig, otheropts); | |
300 | free_page((unsigned long)otheropts); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | /** | |
306 | * smack_sb_kern_mount - Smack specific mount processing | |
307 | * @sb: the file system superblock | |
12204e24 | 308 | * @flags: the mount flags |
e114e473 CS |
309 | * @data: the smack mount options |
310 | * | |
311 | * Returns 0 on success, an error code on failure | |
312 | */ | |
12204e24 | 313 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
314 | { |
315 | struct dentry *root = sb->s_root; | |
316 | struct inode *inode = root->d_inode; | |
317 | struct superblock_smack *sp = sb->s_security; | |
318 | struct inode_smack *isp; | |
319 | char *op; | |
320 | char *commap; | |
321 | char *nsp; | |
322 | ||
323 | spin_lock(&sp->smk_sblock); | |
324 | if (sp->smk_initialized != 0) { | |
325 | spin_unlock(&sp->smk_sblock); | |
326 | return 0; | |
327 | } | |
328 | sp->smk_initialized = 1; | |
329 | spin_unlock(&sp->smk_sblock); | |
330 | ||
331 | for (op = data; op != NULL; op = commap) { | |
332 | commap = strchr(op, ','); | |
333 | if (commap != NULL) | |
334 | *commap++ = '\0'; | |
335 | ||
336 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
337 | op += strlen(SMK_FSHAT); | |
338 | nsp = smk_import(op, 0); | |
339 | if (nsp != NULL) | |
340 | sp->smk_hat = nsp; | |
341 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
342 | op += strlen(SMK_FSFLOOR); | |
343 | nsp = smk_import(op, 0); | |
344 | if (nsp != NULL) | |
345 | sp->smk_floor = nsp; | |
346 | } else if (strncmp(op, SMK_FSDEFAULT, | |
347 | strlen(SMK_FSDEFAULT)) == 0) { | |
348 | op += strlen(SMK_FSDEFAULT); | |
349 | nsp = smk_import(op, 0); | |
350 | if (nsp != NULL) | |
351 | sp->smk_default = nsp; | |
352 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
353 | op += strlen(SMK_FSROOT); | |
354 | nsp = smk_import(op, 0); | |
355 | if (nsp != NULL) | |
356 | sp->smk_root = nsp; | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * Initialize the root inode. | |
362 | */ | |
363 | isp = inode->i_security; | |
364 | if (isp == NULL) | |
365 | inode->i_security = new_inode_smack(sp->smk_root); | |
366 | else | |
367 | isp->smk_inode = sp->smk_root; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | /** | |
373 | * smack_sb_statfs - Smack check on statfs | |
374 | * @dentry: identifies the file system in question | |
375 | * | |
376 | * Returns 0 if current can read the floor of the filesystem, | |
377 | * and error code otherwise | |
378 | */ | |
379 | static int smack_sb_statfs(struct dentry *dentry) | |
380 | { | |
381 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
382 | int rc; |
383 | struct smk_audit_info ad; | |
384 | ||
385 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
386 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 387 | |
ecfcc53f EB |
388 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
389 | return rc; | |
e114e473 CS |
390 | } |
391 | ||
392 | /** | |
393 | * smack_sb_mount - Smack check for mounting | |
394 | * @dev_name: unused | |
251a2a95 | 395 | * @path: mount point |
e114e473 CS |
396 | * @type: unused |
397 | * @flags: unused | |
398 | * @data: unused | |
399 | * | |
400 | * Returns 0 if current can write the floor of the filesystem | |
401 | * being mounted on, an error code otherwise. | |
402 | */ | |
b5266eb4 | 403 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
404 | char *type, unsigned long flags, void *data) |
405 | { | |
b5266eb4 | 406 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 407 | struct smk_audit_info ad; |
e114e473 | 408 | |
ecfcc53f EB |
409 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
410 | smk_ad_setfield_u_fs_path(&ad, *path); | |
411 | ||
412 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
413 | } |
414 | ||
415 | /** | |
416 | * smack_sb_umount - Smack check for unmounting | |
417 | * @mnt: file system to unmount | |
418 | * @flags: unused | |
419 | * | |
420 | * Returns 0 if current can write the floor of the filesystem | |
421 | * being unmounted, an error code otherwise. | |
422 | */ | |
423 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
424 | { | |
425 | struct superblock_smack *sbp; | |
ecfcc53f | 426 | struct smk_audit_info ad; |
e114e473 | 427 | |
ecfcc53f | 428 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
de27a5bf | 429 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); |
ecfcc53f | 430 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); |
e114e473 | 431 | |
ecfcc53f EB |
432 | sbp = mnt->mnt_sb->s_security; |
433 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
434 | } |
435 | ||
676dac4b CS |
436 | /* |
437 | * BPRM hooks | |
438 | */ | |
439 | ||
440 | static int smack_bprm_set_creds(struct linux_binprm *bprm) | |
441 | { | |
442 | struct task_smack *tsp = bprm->cred->security; | |
443 | struct inode_smack *isp; | |
444 | struct dentry *dp; | |
445 | int rc; | |
446 | ||
447 | rc = cap_bprm_set_creds(bprm); | |
448 | if (rc != 0) | |
449 | return rc; | |
450 | ||
451 | if (bprm->cred_prepared) | |
452 | return 0; | |
453 | ||
454 | if (bprm->file == NULL || bprm->file->f_dentry == NULL) | |
455 | return 0; | |
456 | ||
457 | dp = bprm->file->f_dentry; | |
458 | ||
459 | if (dp->d_inode == NULL) | |
460 | return 0; | |
461 | ||
462 | isp = dp->d_inode->i_security; | |
463 | ||
464 | if (isp->smk_task != NULL) | |
465 | tsp->smk_task = isp->smk_task; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
e114e473 CS |
470 | /* |
471 | * Inode hooks | |
472 | */ | |
473 | ||
474 | /** | |
475 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 476 | * @inode: the inode in need of a blob |
e114e473 CS |
477 | * |
478 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
479 | */ | |
480 | static int smack_inode_alloc_security(struct inode *inode) | |
481 | { | |
676dac4b | 482 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
483 | if (inode->i_security == NULL) |
484 | return -ENOMEM; | |
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 490 | * @inode: the inode with a blob |
e114e473 CS |
491 | * |
492 | * Clears the blob pointer in inode | |
493 | */ | |
494 | static void smack_inode_free_security(struct inode *inode) | |
495 | { | |
496 | kfree(inode->i_security); | |
497 | inode->i_security = NULL; | |
498 | } | |
499 | ||
500 | /** | |
501 | * smack_inode_init_security - copy out the smack from an inode | |
502 | * @inode: the inode | |
503 | * @dir: unused | |
504 | * @name: where to put the attribute name | |
505 | * @value: where to put the attribute value | |
506 | * @len: where to put the length of the attribute | |
507 | * | |
508 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
509 | */ | |
510 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
511 | char **name, void **value, size_t *len) | |
512 | { | |
513 | char *isp = smk_of_inode(inode); | |
5c6d1125 | 514 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 515 | int may; |
e114e473 CS |
516 | |
517 | if (name) { | |
518 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
519 | if (*name == NULL) | |
520 | return -ENOMEM; | |
521 | } | |
522 | ||
523 | if (value) { | |
7898e1f8 CS |
524 | rcu_read_lock(); |
525 | may = smk_access_entry(smk_of_current(), dsp, &smack_rule_list); | |
526 | rcu_read_unlock(); | |
5c6d1125 JS |
527 | |
528 | /* | |
529 | * If the access rule allows transmutation and | |
530 | * the directory requests transmutation then | |
531 | * by all means transmute. | |
532 | */ | |
7898e1f8 CS |
533 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
534 | smk_inode_transmutable(dir)) | |
5c6d1125 JS |
535 | isp = dsp; |
536 | ||
e114e473 CS |
537 | *value = kstrdup(isp, GFP_KERNEL); |
538 | if (*value == NULL) | |
539 | return -ENOMEM; | |
540 | } | |
541 | ||
542 | if (len) | |
543 | *len = strlen(isp) + 1; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | /** | |
549 | * smack_inode_link - Smack check on link | |
550 | * @old_dentry: the existing object | |
551 | * @dir: unused | |
552 | * @new_dentry: the new object | |
553 | * | |
554 | * Returns 0 if access is permitted, an error code otherwise | |
555 | */ | |
556 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
557 | struct dentry *new_dentry) | |
558 | { | |
e114e473 | 559 | char *isp; |
ecfcc53f EB |
560 | struct smk_audit_info ad; |
561 | int rc; | |
562 | ||
563 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
564 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
565 | |
566 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 567 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
568 | |
569 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
570 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
571 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
572 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
573 | } |
574 | ||
575 | return rc; | |
576 | } | |
577 | ||
578 | /** | |
579 | * smack_inode_unlink - Smack check on inode deletion | |
580 | * @dir: containing directory object | |
581 | * @dentry: file to unlink | |
582 | * | |
583 | * Returns 0 if current can write the containing directory | |
584 | * and the object, error code otherwise | |
585 | */ | |
586 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
587 | { | |
588 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 589 | struct smk_audit_info ad; |
e114e473 CS |
590 | int rc; |
591 | ||
ecfcc53f EB |
592 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
593 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
594 | ||
e114e473 CS |
595 | /* |
596 | * You need write access to the thing you're unlinking | |
597 | */ | |
ecfcc53f EB |
598 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
599 | if (rc == 0) { | |
e114e473 CS |
600 | /* |
601 | * You also need write access to the containing directory | |
602 | */ | |
ecfcc53f EB |
603 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
604 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
605 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
606 | } | |
e114e473 CS |
607 | return rc; |
608 | } | |
609 | ||
610 | /** | |
611 | * smack_inode_rmdir - Smack check on directory deletion | |
612 | * @dir: containing directory object | |
613 | * @dentry: directory to unlink | |
614 | * | |
615 | * Returns 0 if current can write the containing directory | |
616 | * and the directory, error code otherwise | |
617 | */ | |
618 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
619 | { | |
ecfcc53f | 620 | struct smk_audit_info ad; |
e114e473 CS |
621 | int rc; |
622 | ||
ecfcc53f EB |
623 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
624 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
625 | ||
e114e473 CS |
626 | /* |
627 | * You need write access to the thing you're removing | |
628 | */ | |
ecfcc53f EB |
629 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
630 | if (rc == 0) { | |
e114e473 CS |
631 | /* |
632 | * You also need write access to the containing directory | |
633 | */ | |
ecfcc53f EB |
634 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
635 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
636 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
637 | } | |
e114e473 CS |
638 | |
639 | return rc; | |
640 | } | |
641 | ||
642 | /** | |
643 | * smack_inode_rename - Smack check on rename | |
644 | * @old_inode: the old directory | |
645 | * @old_dentry: unused | |
646 | * @new_inode: the new directory | |
647 | * @new_dentry: unused | |
648 | * | |
649 | * Read and write access is required on both the old and | |
650 | * new directories. | |
651 | * | |
652 | * Returns 0 if access is permitted, an error code otherwise | |
653 | */ | |
654 | static int smack_inode_rename(struct inode *old_inode, | |
655 | struct dentry *old_dentry, | |
656 | struct inode *new_inode, | |
657 | struct dentry *new_dentry) | |
658 | { | |
659 | int rc; | |
660 | char *isp; | |
ecfcc53f EB |
661 | struct smk_audit_info ad; |
662 | ||
663 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
664 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
665 | |
666 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 667 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
668 | |
669 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
670 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
671 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
672 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 673 | } |
e114e473 CS |
674 | return rc; |
675 | } | |
676 | ||
677 | /** | |
678 | * smack_inode_permission - Smack version of permission() | |
679 | * @inode: the inode in question | |
680 | * @mask: the access requested | |
e114e473 CS |
681 | * |
682 | * This is the important Smack hook. | |
683 | * | |
684 | * Returns 0 if access is permitted, -EACCES otherwise | |
685 | */ | |
b77b0646 | 686 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 687 | { |
ecfcc53f | 688 | struct smk_audit_info ad; |
d09ca739 EP |
689 | |
690 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
691 | /* |
692 | * No permission to check. Existence test. Yup, it's there. | |
693 | */ | |
694 | if (mask == 0) | |
695 | return 0; | |
ecfcc53f EB |
696 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
697 | smk_ad_setfield_u_fs_inode(&ad, inode); | |
698 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
699 | } |
700 | ||
701 | /** | |
702 | * smack_inode_setattr - Smack check for setting attributes | |
703 | * @dentry: the object | |
704 | * @iattr: for the force flag | |
705 | * | |
706 | * Returns 0 if access is permitted, an error code otherwise | |
707 | */ | |
708 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
709 | { | |
ecfcc53f | 710 | struct smk_audit_info ad; |
e114e473 CS |
711 | /* |
712 | * Need to allow for clearing the setuid bit. | |
713 | */ | |
714 | if (iattr->ia_valid & ATTR_FORCE) | |
715 | return 0; | |
ecfcc53f EB |
716 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
717 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 718 | |
ecfcc53f | 719 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
720 | } |
721 | ||
722 | /** | |
723 | * smack_inode_getattr - Smack check for getting attributes | |
724 | * @mnt: unused | |
725 | * @dentry: the object | |
726 | * | |
727 | * Returns 0 if access is permitted, an error code otherwise | |
728 | */ | |
729 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
730 | { | |
ecfcc53f EB |
731 | struct smk_audit_info ad; |
732 | ||
733 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
734 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
735 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
736 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
737 | } |
738 | ||
739 | /** | |
740 | * smack_inode_setxattr - Smack check for setting xattrs | |
741 | * @dentry: the object | |
742 | * @name: name of the attribute | |
743 | * @value: unused | |
744 | * @size: unused | |
745 | * @flags: unused | |
746 | * | |
747 | * This protects the Smack attribute explicitly. | |
748 | * | |
749 | * Returns 0 if access is permitted, an error code otherwise | |
750 | */ | |
8f0cfa52 DH |
751 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
752 | const void *value, size_t size, int flags) | |
e114e473 | 753 | { |
ecfcc53f | 754 | struct smk_audit_info ad; |
bcdca225 | 755 | int rc = 0; |
e114e473 | 756 | |
bcdca225 CS |
757 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
758 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 759 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
760 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
761 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
762 | if (!capable(CAP_MAC_ADMIN)) |
763 | rc = -EPERM; | |
defc433b EB |
764 | /* |
765 | * check label validity here so import wont fail on | |
766 | * post_setxattr | |
767 | */ | |
768 | if (size == 0 || size >= SMK_LABELLEN || | |
769 | smk_import(value, size) == NULL) | |
4303154e | 770 | rc = -EINVAL; |
5c6d1125 JS |
771 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
772 | if (!capable(CAP_MAC_ADMIN)) | |
773 | rc = -EPERM; | |
774 | if (size != TRANS_TRUE_SIZE || | |
775 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
776 | rc = -EINVAL; | |
bcdca225 CS |
777 | } else |
778 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
779 | ||
ecfcc53f EB |
780 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
781 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
782 | ||
bcdca225 | 783 | if (rc == 0) |
ecfcc53f | 784 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
785 | |
786 | return rc; | |
e114e473 CS |
787 | } |
788 | ||
789 | /** | |
790 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
791 | * @dentry: object | |
792 | * @name: attribute name | |
793 | * @value: attribute value | |
794 | * @size: attribute size | |
795 | * @flags: unused | |
796 | * | |
797 | * Set the pointer in the inode blob to the entry found | |
798 | * in the master label list. | |
799 | */ | |
8f0cfa52 DH |
800 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
801 | const void *value, size_t size, int flags) | |
e114e473 | 802 | { |
e114e473 | 803 | char *nsp; |
5c6d1125 | 804 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
805 | |
806 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 807 | nsp = smk_import(value, size); |
676dac4b CS |
808 | if (nsp != NULL) |
809 | isp->smk_inode = nsp; | |
810 | else | |
811 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
812 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
813 | nsp = smk_import(value, size); | |
676dac4b CS |
814 | if (nsp != NULL) |
815 | isp->smk_task = nsp; | |
816 | else | |
817 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
818 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
819 | nsp = smk_import(value, size); | |
820 | if (nsp != NULL) | |
821 | isp->smk_mmap = nsp; | |
822 | else | |
823 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
824 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
825 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
826 | |
827 | return; | |
828 | } | |
829 | ||
830 | /* | |
831 | * smack_inode_getxattr - Smack check on getxattr | |
832 | * @dentry: the object | |
833 | * @name: unused | |
834 | * | |
835 | * Returns 0 if access is permitted, an error code otherwise | |
836 | */ | |
8f0cfa52 | 837 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 838 | { |
ecfcc53f EB |
839 | struct smk_audit_info ad; |
840 | ||
841 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
842 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
843 | ||
844 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
845 | } |
846 | ||
847 | /* | |
848 | * smack_inode_removexattr - Smack check on removexattr | |
849 | * @dentry: the object | |
850 | * @name: name of the attribute | |
851 | * | |
852 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
853 | * | |
854 | * Returns 0 if access is permitted, an error code otherwise | |
855 | */ | |
8f0cfa52 | 856 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 857 | { |
676dac4b | 858 | struct inode_smack *isp; |
ecfcc53f | 859 | struct smk_audit_info ad; |
bcdca225 | 860 | int rc = 0; |
e114e473 | 861 | |
bcdca225 CS |
862 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
863 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 864 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 865 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
866 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
867 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
868 | if (!capable(CAP_MAC_ADMIN)) |
869 | rc = -EPERM; | |
870 | } else | |
871 | rc = cap_inode_removexattr(dentry, name); | |
872 | ||
ecfcc53f EB |
873 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
874 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
bcdca225 | 875 | if (rc == 0) |
ecfcc53f | 876 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 877 | |
676dac4b CS |
878 | if (rc == 0) { |
879 | isp = dentry->d_inode->i_security; | |
880 | isp->smk_task = NULL; | |
7898e1f8 | 881 | isp->smk_mmap = NULL; |
676dac4b CS |
882 | } |
883 | ||
bcdca225 | 884 | return rc; |
e114e473 CS |
885 | } |
886 | ||
887 | /** | |
888 | * smack_inode_getsecurity - get smack xattrs | |
889 | * @inode: the object | |
890 | * @name: attribute name | |
891 | * @buffer: where to put the result | |
251a2a95 | 892 | * @alloc: unused |
e114e473 CS |
893 | * |
894 | * Returns the size of the attribute or an error code | |
895 | */ | |
896 | static int smack_inode_getsecurity(const struct inode *inode, | |
897 | const char *name, void **buffer, | |
898 | bool alloc) | |
899 | { | |
900 | struct socket_smack *ssp; | |
901 | struct socket *sock; | |
902 | struct super_block *sbp; | |
903 | struct inode *ip = (struct inode *)inode; | |
904 | char *isp; | |
905 | int ilen; | |
906 | int rc = 0; | |
907 | ||
908 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
909 | isp = smk_of_inode(inode); | |
910 | ilen = strlen(isp) + 1; | |
911 | *buffer = isp; | |
912 | return ilen; | |
913 | } | |
914 | ||
915 | /* | |
916 | * The rest of the Smack xattrs are only on sockets. | |
917 | */ | |
918 | sbp = ip->i_sb; | |
919 | if (sbp->s_magic != SOCKFS_MAGIC) | |
920 | return -EOPNOTSUPP; | |
921 | ||
922 | sock = SOCKET_I(ip); | |
2e1d146a | 923 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
924 | return -EOPNOTSUPP; |
925 | ||
926 | ssp = sock->sk->sk_security; | |
927 | ||
928 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
929 | isp = ssp->smk_in; | |
930 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
931 | isp = ssp->smk_out; | |
932 | else | |
933 | return -EOPNOTSUPP; | |
934 | ||
935 | ilen = strlen(isp) + 1; | |
936 | if (rc == 0) { | |
937 | *buffer = isp; | |
938 | rc = ilen; | |
939 | } | |
940 | ||
941 | return rc; | |
942 | } | |
943 | ||
944 | ||
945 | /** | |
946 | * smack_inode_listsecurity - list the Smack attributes | |
947 | * @inode: the object | |
948 | * @buffer: where they go | |
949 | * @buffer_size: size of buffer | |
950 | * | |
951 | * Returns 0 on success, -EINVAL otherwise | |
952 | */ | |
953 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
954 | size_t buffer_size) | |
955 | { | |
956 | int len = strlen(XATTR_NAME_SMACK); | |
957 | ||
958 | if (buffer != NULL && len <= buffer_size) { | |
959 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
960 | return len; | |
961 | } | |
962 | return -EINVAL; | |
963 | } | |
964 | ||
d20bdda6 AD |
965 | /** |
966 | * smack_inode_getsecid - Extract inode's security id | |
967 | * @inode: inode to extract the info from | |
968 | * @secid: where result will be saved | |
969 | */ | |
970 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
971 | { | |
972 | struct inode_smack *isp = inode->i_security; | |
973 | ||
974 | *secid = smack_to_secid(isp->smk_inode); | |
975 | } | |
976 | ||
e114e473 CS |
977 | /* |
978 | * File Hooks | |
979 | */ | |
980 | ||
981 | /** | |
982 | * smack_file_permission - Smack check on file operations | |
983 | * @file: unused | |
984 | * @mask: unused | |
985 | * | |
986 | * Returns 0 | |
987 | * | |
988 | * Should access checks be done on each read or write? | |
989 | * UNICOS and SELinux say yes. | |
990 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
991 | * | |
992 | * I'll say no for now. Smack does not do the frequent | |
993 | * label changing that SELinux does. | |
994 | */ | |
995 | static int smack_file_permission(struct file *file, int mask) | |
996 | { | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | /** | |
1001 | * smack_file_alloc_security - assign a file security blob | |
1002 | * @file: the object | |
1003 | * | |
1004 | * The security blob for a file is a pointer to the master | |
1005 | * label list, so no allocation is done. | |
1006 | * | |
1007 | * Returns 0 | |
1008 | */ | |
1009 | static int smack_file_alloc_security(struct file *file) | |
1010 | { | |
676dac4b | 1011 | file->f_security = smk_of_current(); |
e114e473 CS |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * smack_file_free_security - clear a file security blob | |
1017 | * @file: the object | |
1018 | * | |
1019 | * The security blob for a file is a pointer to the master | |
1020 | * label list, so no memory is freed. | |
1021 | */ | |
1022 | static void smack_file_free_security(struct file *file) | |
1023 | { | |
1024 | file->f_security = NULL; | |
1025 | } | |
1026 | ||
1027 | /** | |
1028 | * smack_file_ioctl - Smack check on ioctls | |
1029 | * @file: the object | |
1030 | * @cmd: what to do | |
1031 | * @arg: unused | |
1032 | * | |
1033 | * Relies heavily on the correct use of the ioctl command conventions. | |
1034 | * | |
1035 | * Returns 0 if allowed, error code otherwise | |
1036 | */ | |
1037 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1038 | unsigned long arg) | |
1039 | { | |
1040 | int rc = 0; | |
ecfcc53f EB |
1041 | struct smk_audit_info ad; |
1042 | ||
1043 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
1044 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1045 | |
1046 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1047 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1048 | |
1049 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1050 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1051 | |
1052 | return rc; | |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * smack_file_lock - Smack check on file locking | |
1057 | * @file: the object | |
251a2a95 | 1058 | * @cmd: unused |
e114e473 CS |
1059 | * |
1060 | * Returns 0 if current has write access, error code otherwise | |
1061 | */ | |
1062 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1063 | { | |
ecfcc53f EB |
1064 | struct smk_audit_info ad; |
1065 | ||
1066 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
1067 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); | |
1068 | return smk_curacc(file->f_security, MAY_WRITE, &ad); | |
e114e473 CS |
1069 | } |
1070 | ||
1071 | /** | |
1072 | * smack_file_fcntl - Smack check on fcntl | |
1073 | * @file: the object | |
1074 | * @cmd: what action to check | |
1075 | * @arg: unused | |
1076 | * | |
1077 | * Returns 0 if current has access, error code otherwise | |
1078 | */ | |
1079 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1080 | unsigned long arg) | |
1081 | { | |
ecfcc53f | 1082 | struct smk_audit_info ad; |
e114e473 CS |
1083 | int rc; |
1084 | ||
ecfcc53f EB |
1085 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
1086 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
1087 | ||
e114e473 CS |
1088 | switch (cmd) { |
1089 | case F_DUPFD: | |
1090 | case F_GETFD: | |
1091 | case F_GETFL: | |
1092 | case F_GETLK: | |
1093 | case F_GETOWN: | |
1094 | case F_GETSIG: | |
ecfcc53f | 1095 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1096 | break; |
1097 | case F_SETFD: | |
1098 | case F_SETFL: | |
1099 | case F_SETLK: | |
1100 | case F_SETLKW: | |
1101 | case F_SETOWN: | |
1102 | case F_SETSIG: | |
ecfcc53f | 1103 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1104 | break; |
1105 | default: | |
ecfcc53f | 1106 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
e114e473 CS |
1107 | } |
1108 | ||
1109 | return rc; | |
1110 | } | |
1111 | ||
7898e1f8 CS |
1112 | /** |
1113 | * smk_mmap_list_check - the mmap check | |
1114 | * @sub: subject label | |
1115 | * @obj: object label | |
1116 | * @access: access mode | |
1117 | * @local: the task specific rule list | |
1118 | * | |
1119 | * Returns 0 if acces is permitted, -EACCES otherwise | |
1120 | */ | |
1121 | static int smk_mmap_list_check(char *sub, char *obj, int access, | |
1122 | struct list_head *local) | |
1123 | { | |
1124 | int may; | |
1125 | ||
1126 | /* | |
1127 | * If there is not a global rule that | |
1128 | * allows access say no. | |
1129 | */ | |
1130 | may = smk_access_entry(sub, obj, &smack_rule_list); | |
1131 | if (may == -ENOENT || (may & access) != access) | |
1132 | return -EACCES; | |
1133 | /* | |
1134 | * If there is a task local rule that | |
1135 | * denies access say no. | |
1136 | */ | |
1137 | may = smk_access_entry(sub, obj, local); | |
1138 | if (may != -ENOENT && (may & access) != access) | |
1139 | return -EACCES; | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * smack_file_mmap : | |
1146 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1147 | * if mapping anonymous memory. | |
1148 | * @file contains the file structure for file to map (may be NULL). | |
1149 | * @reqprot contains the protection requested by the application. | |
1150 | * @prot contains the protection that will be applied by the kernel. | |
1151 | * @flags contains the operational flags. | |
1152 | * Return 0 if permission is granted. | |
1153 | */ | |
1154 | static int smack_file_mmap(struct file *file, | |
1155 | unsigned long reqprot, unsigned long prot, | |
1156 | unsigned long flags, unsigned long addr, | |
1157 | unsigned long addr_only) | |
1158 | { | |
1159 | struct smack_rule *srp; | |
1160 | struct task_smack *tsp; | |
1161 | char *sp; | |
1162 | char *msmack; | |
1163 | struct inode_smack *isp; | |
1164 | struct dentry *dp; | |
1165 | int rc; | |
1166 | ||
1167 | /* do DAC check on address space usage */ | |
1168 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1169 | if (rc || addr_only) | |
1170 | return rc; | |
1171 | ||
1172 | if (file == NULL || file->f_dentry == NULL) | |
1173 | return 0; | |
1174 | ||
1175 | dp = file->f_dentry; | |
1176 | ||
1177 | if (dp->d_inode == NULL) | |
1178 | return 0; | |
1179 | ||
1180 | isp = dp->d_inode->i_security; | |
1181 | if (isp->smk_mmap == NULL) | |
1182 | return 0; | |
1183 | msmack = isp->smk_mmap; | |
1184 | ||
1185 | tsp = current_security(); | |
1186 | sp = smk_of_current(); | |
1187 | rc = 0; | |
1188 | ||
1189 | rcu_read_lock(); | |
1190 | /* | |
1191 | * For each Smack rule associated with the subject | |
1192 | * label verify that the SMACK64MMAP also has access | |
1193 | * to that rule's object label. | |
1194 | * | |
1195 | * Because neither of the labels comes | |
1196 | * from the networking code it is sufficient | |
1197 | * to compare pointers. | |
1198 | */ | |
1199 | list_for_each_entry_rcu(srp, &smack_rule_list, list) { | |
1200 | if (srp->smk_subject != sp) | |
1201 | continue; | |
1202 | /* | |
1203 | * Matching labels always allows access. | |
1204 | */ | |
1205 | if (msmack == srp->smk_object) | |
1206 | continue; | |
1207 | ||
1208 | rc = smk_mmap_list_check(msmack, srp->smk_object, | |
1209 | srp->smk_access, &tsp->smk_rules); | |
1210 | if (rc != 0) | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | rcu_read_unlock(); | |
1215 | ||
1216 | return rc; | |
1217 | } | |
1218 | ||
e114e473 CS |
1219 | /** |
1220 | * smack_file_set_fowner - set the file security blob value | |
1221 | * @file: object in question | |
1222 | * | |
1223 | * Returns 0 | |
1224 | * Further research may be required on this one. | |
1225 | */ | |
1226 | static int smack_file_set_fowner(struct file *file) | |
1227 | { | |
676dac4b | 1228 | file->f_security = smk_of_current(); |
e114e473 CS |
1229 | return 0; |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * smack_file_send_sigiotask - Smack on sigio | |
1234 | * @tsk: The target task | |
1235 | * @fown: the object the signal come from | |
1236 | * @signum: unused | |
1237 | * | |
1238 | * Allow a privileged task to get signals even if it shouldn't | |
1239 | * | |
1240 | * Returns 0 if a subject with the object's smack could | |
1241 | * write to the task, an error code otherwise. | |
1242 | */ | |
1243 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1244 | struct fown_struct *fown, int signum) | |
1245 | { | |
1246 | struct file *file; | |
1247 | int rc; | |
676dac4b | 1248 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1249 | struct smk_audit_info ad; |
e114e473 CS |
1250 | |
1251 | /* | |
1252 | * struct fown_struct is never outside the context of a struct file | |
1253 | */ | |
1254 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1255 | |
ecfcc53f EB |
1256 | /* we don't log here as rc can be overriden */ |
1257 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1258 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1259 | rc = 0; |
1260 | ||
1261 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1262 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1263 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1264 | return rc; |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * smack_file_receive - Smack file receive check | |
1269 | * @file: the object | |
1270 | * | |
1271 | * Returns 0 if current has access, error code otherwise | |
1272 | */ | |
1273 | static int smack_file_receive(struct file *file) | |
1274 | { | |
1275 | int may = 0; | |
ecfcc53f | 1276 | struct smk_audit_info ad; |
e114e473 | 1277 | |
ecfcc53f EB |
1278 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1279 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1280 | /* |
1281 | * This code relies on bitmasks. | |
1282 | */ | |
1283 | if (file->f_mode & FMODE_READ) | |
1284 | may = MAY_READ; | |
1285 | if (file->f_mode & FMODE_WRITE) | |
1286 | may |= MAY_WRITE; | |
1287 | ||
ecfcc53f | 1288 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1289 | } |
1290 | ||
1291 | /* | |
1292 | * Task hooks | |
1293 | */ | |
1294 | ||
ee18d64c DH |
1295 | /** |
1296 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1297 | * @new: the new credentials | |
1298 | * @gfp: the atomicity of any memory allocations | |
1299 | * | |
1300 | * Prepare a blank set of credentials for modification. This must allocate all | |
1301 | * the memory the LSM module might require such that cred_transfer() can | |
1302 | * complete without error. | |
1303 | */ | |
1304 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1305 | { | |
7898e1f8 CS |
1306 | struct task_smack *tsp; |
1307 | ||
1308 | tsp = new_task_smack(NULL, NULL, gfp); | |
1309 | if (tsp == NULL) | |
676dac4b | 1310 | return -ENOMEM; |
7898e1f8 CS |
1311 | |
1312 | cred->security = tsp; | |
1313 | ||
ee18d64c DH |
1314 | return 0; |
1315 | } | |
1316 | ||
1317 | ||
e114e473 | 1318 | /** |
f1752eec DH |
1319 | * smack_cred_free - "free" task-level security credentials |
1320 | * @cred: the credentials in question | |
e114e473 | 1321 | * |
e114e473 | 1322 | */ |
f1752eec | 1323 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1324 | { |
7898e1f8 CS |
1325 | struct task_smack *tsp = cred->security; |
1326 | struct smack_rule *rp; | |
1327 | struct list_head *l; | |
1328 | struct list_head *n; | |
1329 | ||
1330 | if (tsp == NULL) | |
1331 | return; | |
1332 | cred->security = NULL; | |
1333 | ||
1334 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1335 | rp = list_entry(l, struct smack_rule, list); | |
1336 | list_del(&rp->list); | |
1337 | kfree(rp); | |
1338 | } | |
1339 | kfree(tsp); | |
e114e473 CS |
1340 | } |
1341 | ||
d84f4f99 DH |
1342 | /** |
1343 | * smack_cred_prepare - prepare new set of credentials for modification | |
1344 | * @new: the new credentials | |
1345 | * @old: the original credentials | |
1346 | * @gfp: the atomicity of any memory allocations | |
1347 | * | |
1348 | * Prepare a new set of credentials for modification. | |
1349 | */ | |
1350 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1351 | gfp_t gfp) | |
1352 | { | |
676dac4b CS |
1353 | struct task_smack *old_tsp = old->security; |
1354 | struct task_smack *new_tsp; | |
7898e1f8 | 1355 | int rc; |
676dac4b | 1356 | |
7898e1f8 | 1357 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1358 | if (new_tsp == NULL) |
1359 | return -ENOMEM; | |
1360 | ||
7898e1f8 CS |
1361 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1362 | if (rc != 0) | |
1363 | return rc; | |
1364 | ||
676dac4b | 1365 | new->security = new_tsp; |
d84f4f99 DH |
1366 | return 0; |
1367 | } | |
1368 | ||
ee18d64c DH |
1369 | /** |
1370 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1371 | * @new: the new credentials | |
1372 | * @old: the original credentials | |
1373 | * | |
1374 | * Fill in a set of blank credentials from another set of credentials. | |
1375 | */ | |
1376 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1377 | { | |
676dac4b CS |
1378 | struct task_smack *old_tsp = old->security; |
1379 | struct task_smack *new_tsp = new->security; | |
1380 | ||
1381 | new_tsp->smk_task = old_tsp->smk_task; | |
1382 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1383 | mutex_init(&new_tsp->smk_rules_lock); |
1384 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1385 | ||
1386 | ||
1387 | /* cbs copy rule list */ | |
ee18d64c DH |
1388 | } |
1389 | ||
3a3b7ce9 DH |
1390 | /** |
1391 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1392 | * @new: points to the set of credentials to be modified. |
1393 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1394 | * |
1395 | * Set the security data for a kernel service. | |
1396 | */ | |
1397 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1398 | { | |
676dac4b | 1399 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1400 | char *smack = smack_from_secid(secid); |
1401 | ||
1402 | if (smack == NULL) | |
1403 | return -EINVAL; | |
1404 | ||
676dac4b | 1405 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1406 | return 0; |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1411 | * @new: points to the set of credentials to be modified |
1412 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1413 | * |
1414 | * Set the file creation context in a set of credentials to the same | |
1415 | * as the objective context of the specified inode | |
1416 | */ | |
1417 | static int smack_kernel_create_files_as(struct cred *new, | |
1418 | struct inode *inode) | |
1419 | { | |
1420 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1421 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1422 | |
676dac4b CS |
1423 | tsp->smk_forked = isp->smk_inode; |
1424 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1425 | return 0; |
1426 | } | |
1427 | ||
ecfcc53f EB |
1428 | /** |
1429 | * smk_curacc_on_task - helper to log task related access | |
1430 | * @p: the task object | |
1431 | * @access : the access requested | |
1432 | * | |
1433 | * Return 0 if access is permitted | |
1434 | */ | |
1435 | static int smk_curacc_on_task(struct task_struct *p, int access) | |
1436 | { | |
1437 | struct smk_audit_info ad; | |
1438 | ||
1439 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1440 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1441 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1442 | } |
1443 | ||
e114e473 CS |
1444 | /** |
1445 | * smack_task_setpgid - Smack check on setting pgid | |
1446 | * @p: the task object | |
1447 | * @pgid: unused | |
1448 | * | |
1449 | * Return 0 if write access is permitted | |
1450 | */ | |
1451 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1452 | { | |
ecfcc53f | 1453 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1454 | } |
1455 | ||
1456 | /** | |
1457 | * smack_task_getpgid - Smack access check for getpgid | |
1458 | * @p: the object task | |
1459 | * | |
1460 | * Returns 0 if current can read the object task, error code otherwise | |
1461 | */ | |
1462 | static int smack_task_getpgid(struct task_struct *p) | |
1463 | { | |
ecfcc53f | 1464 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1465 | } |
1466 | ||
1467 | /** | |
1468 | * smack_task_getsid - Smack access check for getsid | |
1469 | * @p: the object task | |
1470 | * | |
1471 | * Returns 0 if current can read the object task, error code otherwise | |
1472 | */ | |
1473 | static int smack_task_getsid(struct task_struct *p) | |
1474 | { | |
ecfcc53f | 1475 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1476 | } |
1477 | ||
1478 | /** | |
1479 | * smack_task_getsecid - get the secid of the task | |
1480 | * @p: the object task | |
1481 | * @secid: where to put the result | |
1482 | * | |
1483 | * Sets the secid to contain a u32 version of the smack label. | |
1484 | */ | |
1485 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1486 | { | |
676dac4b | 1487 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1488 | } |
1489 | ||
1490 | /** | |
1491 | * smack_task_setnice - Smack check on setting nice | |
1492 | * @p: the task object | |
1493 | * @nice: unused | |
1494 | * | |
1495 | * Return 0 if write access is permitted | |
1496 | */ | |
1497 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1498 | { | |
bcdca225 CS |
1499 | int rc; |
1500 | ||
1501 | rc = cap_task_setnice(p, nice); | |
1502 | if (rc == 0) | |
ecfcc53f | 1503 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1504 | return rc; |
e114e473 CS |
1505 | } |
1506 | ||
1507 | /** | |
1508 | * smack_task_setioprio - Smack check on setting ioprio | |
1509 | * @p: the task object | |
1510 | * @ioprio: unused | |
1511 | * | |
1512 | * Return 0 if write access is permitted | |
1513 | */ | |
1514 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1515 | { | |
bcdca225 CS |
1516 | int rc; |
1517 | ||
1518 | rc = cap_task_setioprio(p, ioprio); | |
1519 | if (rc == 0) | |
ecfcc53f | 1520 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1521 | return rc; |
e114e473 CS |
1522 | } |
1523 | ||
1524 | /** | |
1525 | * smack_task_getioprio - Smack check on reading ioprio | |
1526 | * @p: the task object | |
1527 | * | |
1528 | * Return 0 if read access is permitted | |
1529 | */ | |
1530 | static int smack_task_getioprio(struct task_struct *p) | |
1531 | { | |
ecfcc53f | 1532 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1533 | } |
1534 | ||
1535 | /** | |
1536 | * smack_task_setscheduler - Smack check on setting scheduler | |
1537 | * @p: the task object | |
1538 | * @policy: unused | |
1539 | * @lp: unused | |
1540 | * | |
1541 | * Return 0 if read access is permitted | |
1542 | */ | |
b0ae1981 | 1543 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1544 | { |
bcdca225 CS |
1545 | int rc; |
1546 | ||
b0ae1981 | 1547 | rc = cap_task_setscheduler(p); |
bcdca225 | 1548 | if (rc == 0) |
ecfcc53f | 1549 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1550 | return rc; |
e114e473 CS |
1551 | } |
1552 | ||
1553 | /** | |
1554 | * smack_task_getscheduler - Smack check on reading scheduler | |
1555 | * @p: the task object | |
1556 | * | |
1557 | * Return 0 if read access is permitted | |
1558 | */ | |
1559 | static int smack_task_getscheduler(struct task_struct *p) | |
1560 | { | |
ecfcc53f | 1561 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1562 | } |
1563 | ||
1564 | /** | |
1565 | * smack_task_movememory - Smack check on moving memory | |
1566 | * @p: the task object | |
1567 | * | |
1568 | * Return 0 if write access is permitted | |
1569 | */ | |
1570 | static int smack_task_movememory(struct task_struct *p) | |
1571 | { | |
ecfcc53f | 1572 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1573 | } |
1574 | ||
1575 | /** | |
1576 | * smack_task_kill - Smack check on signal delivery | |
1577 | * @p: the task object | |
1578 | * @info: unused | |
1579 | * @sig: unused | |
1580 | * @secid: identifies the smack to use in lieu of current's | |
1581 | * | |
1582 | * Return 0 if write access is permitted | |
1583 | * | |
1584 | * The secid behavior is an artifact of an SELinux hack | |
1585 | * in the USB code. Someday it may go away. | |
1586 | */ | |
1587 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1588 | int sig, u32 secid) | |
1589 | { | |
ecfcc53f EB |
1590 | struct smk_audit_info ad; |
1591 | ||
1592 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1593 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1594 | /* |
1595 | * Sending a signal requires that the sender | |
1596 | * can write the receiver. | |
1597 | */ | |
1598 | if (secid == 0) | |
676dac4b CS |
1599 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1600 | &ad); | |
e114e473 CS |
1601 | /* |
1602 | * If the secid isn't 0 we're dealing with some USB IO | |
1603 | * specific behavior. This is not clean. For one thing | |
1604 | * we can't take privilege into account. | |
1605 | */ | |
676dac4b CS |
1606 | return smk_access(smack_from_secid(secid), |
1607 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1608 | } |
1609 | ||
1610 | /** | |
1611 | * smack_task_wait - Smack access check for waiting | |
1612 | * @p: task to wait for | |
1613 | * | |
1614 | * Returns 0 if current can wait for p, error code otherwise | |
1615 | */ | |
1616 | static int smack_task_wait(struct task_struct *p) | |
1617 | { | |
ecfcc53f | 1618 | struct smk_audit_info ad; |
676dac4b CS |
1619 | char *sp = smk_of_current(); |
1620 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1621 | int rc; |
1622 | ||
ecfcc53f | 1623 | /* we don't log here, we can be overriden */ |
676dac4b | 1624 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1625 | if (rc == 0) |
ecfcc53f | 1626 | goto out_log; |
e114e473 CS |
1627 | |
1628 | /* | |
1629 | * Allow the operation to succeed if either task | |
1630 | * has privilege to perform operations that might | |
1631 | * account for the smack labels having gotten to | |
1632 | * be different in the first place. | |
1633 | * | |
5cd9c58f | 1634 | * This breaks the strict subject/object access |
e114e473 CS |
1635 | * control ideal, taking the object's privilege |
1636 | * state into account in the decision as well as | |
1637 | * the smack value. | |
1638 | */ | |
5cd9c58f | 1639 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1640 | rc = 0; |
1641 | /* we log only if we didn't get overriden */ | |
1642 | out_log: | |
1643 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1644 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1645 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1646 | return rc; |
1647 | } | |
1648 | ||
1649 | /** | |
1650 | * smack_task_to_inode - copy task smack into the inode blob | |
1651 | * @p: task to copy from | |
251a2a95 | 1652 | * @inode: inode to copy to |
e114e473 CS |
1653 | * |
1654 | * Sets the smack pointer in the inode security blob | |
1655 | */ | |
1656 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1657 | { | |
1658 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1659 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * Socket hooks. | |
1664 | */ | |
1665 | ||
1666 | /** | |
1667 | * smack_sk_alloc_security - Allocate a socket blob | |
1668 | * @sk: the socket | |
1669 | * @family: unused | |
251a2a95 | 1670 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1671 | * |
1672 | * Assign Smack pointers to current | |
1673 | * | |
1674 | * Returns 0 on success, -ENOMEM is there's no memory | |
1675 | */ | |
1676 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1677 | { | |
676dac4b | 1678 | char *csp = smk_of_current(); |
e114e473 CS |
1679 | struct socket_smack *ssp; |
1680 | ||
1681 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1682 | if (ssp == NULL) | |
1683 | return -ENOMEM; | |
1684 | ||
1685 | ssp->smk_in = csp; | |
1686 | ssp->smk_out = csp; | |
1687 | ssp->smk_packet[0] = '\0'; | |
1688 | ||
1689 | sk->sk_security = ssp; | |
1690 | ||
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | /** | |
1695 | * smack_sk_free_security - Free a socket blob | |
1696 | * @sk: the socket | |
1697 | * | |
1698 | * Clears the blob pointer | |
1699 | */ | |
1700 | static void smack_sk_free_security(struct sock *sk) | |
1701 | { | |
1702 | kfree(sk->sk_security); | |
1703 | } | |
1704 | ||
07feee8f PM |
1705 | /** |
1706 | * smack_host_label - check host based restrictions | |
1707 | * @sip: the object end | |
1708 | * | |
1709 | * looks for host based access restrictions | |
1710 | * | |
1711 | * This version will only be appropriate for really small sets of single label | |
1712 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1713 | * taken before calling this function. | |
1714 | * | |
1715 | * Returns the label of the far end or NULL if it's not special. | |
1716 | */ | |
1717 | static char *smack_host_label(struct sockaddr_in *sip) | |
1718 | { | |
1719 | struct smk_netlbladdr *snp; | |
1720 | struct in_addr *siap = &sip->sin_addr; | |
1721 | ||
1722 | if (siap->s_addr == 0) | |
1723 | return NULL; | |
1724 | ||
1725 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1726 | /* | |
1727 | * we break after finding the first match because | |
1728 | * the list is sorted from longest to shortest mask | |
1729 | * so we have found the most specific match | |
1730 | */ | |
1731 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1732 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1733 | /* we have found the special CIPSO option */ | |
1734 | if (snp->smk_label == smack_cipso_option) | |
1735 | return NULL; | |
07feee8f | 1736 | return snp->smk_label; |
4303154e | 1737 | } |
07feee8f PM |
1738 | |
1739 | return NULL; | |
1740 | } | |
1741 | ||
e114e473 CS |
1742 | /** |
1743 | * smack_set_catset - convert a capset to netlabel mls categories | |
1744 | * @catset: the Smack categories | |
1745 | * @sap: where to put the netlabel categories | |
1746 | * | |
1747 | * Allocates and fills attr.mls.cat | |
1748 | */ | |
1749 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1750 | { | |
1751 | unsigned char *cp; | |
1752 | unsigned char m; | |
1753 | int cat; | |
1754 | int rc; | |
1755 | int byte; | |
1756 | ||
c60264c4 | 1757 | if (!catset) |
e114e473 CS |
1758 | return; |
1759 | ||
1760 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1761 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1762 | sap->attr.mls.cat->startbit = 0; | |
1763 | ||
1764 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1765 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1766 | if ((m & *cp) == 0) | |
1767 | continue; | |
1768 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1769 | cat, GFP_ATOMIC); | |
1770 | } | |
1771 | } | |
1772 | ||
1773 | /** | |
1774 | * smack_to_secattr - fill a secattr from a smack value | |
1775 | * @smack: the smack value | |
1776 | * @nlsp: where the result goes | |
1777 | * | |
1778 | * Casey says that CIPSO is good enough for now. | |
1779 | * It can be used to effect. | |
1780 | * It can also be abused to effect when necessary. | |
1781 | * Appologies to the TSIG group in general and GW in particular. | |
1782 | */ | |
1783 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1784 | { | |
1785 | struct smack_cipso cipso; | |
1786 | int rc; | |
1787 | ||
6d3dc07c CS |
1788 | nlsp->domain = smack; |
1789 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1790 | |
6d3dc07c CS |
1791 | rc = smack_to_cipso(smack, &cipso); |
1792 | if (rc == 0) { | |
1793 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1794 | smack_set_catset(cipso.smk_catset, nlsp); | |
1795 | } else { | |
1796 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1797 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1798 | } |
1799 | } | |
1800 | ||
1801 | /** | |
1802 | * smack_netlabel - Set the secattr on a socket | |
1803 | * @sk: the socket | |
6d3dc07c | 1804 | * @labeled: socket label scheme |
e114e473 CS |
1805 | * |
1806 | * Convert the outbound smack value (smk_out) to a | |
1807 | * secattr and attach it to the socket. | |
1808 | * | |
1809 | * Returns 0 on success or an error code | |
1810 | */ | |
6d3dc07c | 1811 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1812 | { |
07feee8f | 1813 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1814 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1815 | int rc = 0; |
e114e473 | 1816 | |
6d3dc07c CS |
1817 | /* |
1818 | * Usually the netlabel code will handle changing the | |
1819 | * packet labeling based on the label. | |
1820 | * The case of a single label host is different, because | |
1821 | * a single label host should never get a labeled packet | |
1822 | * even though the label is usually associated with a packet | |
1823 | * label. | |
1824 | */ | |
1825 | local_bh_disable(); | |
1826 | bh_lock_sock_nested(sk); | |
1827 | ||
1828 | if (ssp->smk_out == smack_net_ambient || | |
1829 | labeled == SMACK_UNLABELED_SOCKET) | |
1830 | netlbl_sock_delattr(sk); | |
1831 | else { | |
1832 | netlbl_secattr_init(&secattr); | |
1833 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1834 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1835 | netlbl_secattr_destroy(&secattr); |
1836 | } | |
1837 | ||
1838 | bh_unlock_sock(sk); | |
1839 | local_bh_enable(); | |
4bc87e62 | 1840 | |
e114e473 CS |
1841 | return rc; |
1842 | } | |
1843 | ||
07feee8f PM |
1844 | /** |
1845 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1846 | * @sk: the socket | |
1847 | * @sap: the destination address | |
1848 | * | |
1849 | * Set the correct secattr for the given socket based on the destination | |
1850 | * address and perform any outbound access checks needed. | |
1851 | * | |
1852 | * Returns 0 on success or an error code. | |
1853 | * | |
1854 | */ | |
1855 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1856 | { | |
1857 | int rc; | |
1858 | int sk_lbl; | |
1859 | char *hostsp; | |
1860 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1861 | struct smk_audit_info ad; |
07feee8f PM |
1862 | |
1863 | rcu_read_lock(); | |
1864 | hostsp = smack_host_label(sap); | |
1865 | if (hostsp != NULL) { | |
1866 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1867 | #ifdef CONFIG_AUDIT |
1868 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1869 | ad.a.u.net.family = sap->sin_family; | |
1870 | ad.a.u.net.dport = sap->sin_port; | |
1871 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1872 | #endif | |
1873 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1874 | } else { |
1875 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1876 | rc = 0; | |
1877 | } | |
1878 | rcu_read_unlock(); | |
1879 | if (rc != 0) | |
1880 | return rc; | |
1881 | ||
1882 | return smack_netlabel(sk, sk_lbl); | |
1883 | } | |
1884 | ||
e114e473 CS |
1885 | /** |
1886 | * smack_inode_setsecurity - set smack xattrs | |
1887 | * @inode: the object | |
1888 | * @name: attribute name | |
1889 | * @value: attribute value | |
1890 | * @size: size of the attribute | |
1891 | * @flags: unused | |
1892 | * | |
1893 | * Sets the named attribute in the appropriate blob | |
1894 | * | |
1895 | * Returns 0 on success, or an error code | |
1896 | */ | |
1897 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1898 | const void *value, size_t size, int flags) | |
1899 | { | |
1900 | char *sp; | |
1901 | struct inode_smack *nsp = inode->i_security; | |
1902 | struct socket_smack *ssp; | |
1903 | struct socket *sock; | |
4bc87e62 | 1904 | int rc = 0; |
e114e473 | 1905 | |
4303154e | 1906 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1907 | return -EACCES; |
1908 | ||
1909 | sp = smk_import(value, size); | |
1910 | if (sp == NULL) | |
1911 | return -EINVAL; | |
1912 | ||
1913 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1914 | nsp->smk_inode = sp; | |
ddd29ec6 | 1915 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1916 | return 0; |
1917 | } | |
1918 | /* | |
1919 | * The rest of the Smack xattrs are only on sockets. | |
1920 | */ | |
1921 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1922 | return -EOPNOTSUPP; | |
1923 | ||
1924 | sock = SOCKET_I(inode); | |
2e1d146a | 1925 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1926 | return -EOPNOTSUPP; |
1927 | ||
1928 | ssp = sock->sk->sk_security; | |
1929 | ||
1930 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1931 | ssp->smk_in = sp; | |
1932 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1933 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
1934 | if (sock->sk->sk_family != PF_UNIX) { |
1935 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
1936 | if (rc != 0) | |
1937 | printk(KERN_WARNING | |
1938 | "Smack: \"%s\" netlbl error %d.\n", | |
1939 | __func__, -rc); | |
1940 | } | |
e114e473 CS |
1941 | } else |
1942 | return -EOPNOTSUPP; | |
1943 | ||
1944 | return 0; | |
1945 | } | |
1946 | ||
1947 | /** | |
1948 | * smack_socket_post_create - finish socket setup | |
1949 | * @sock: the socket | |
1950 | * @family: protocol family | |
1951 | * @type: unused | |
1952 | * @protocol: unused | |
1953 | * @kern: unused | |
1954 | * | |
1955 | * Sets the netlabel information on the socket | |
1956 | * | |
1957 | * Returns 0 on success, and error code otherwise | |
1958 | */ | |
1959 | static int smack_socket_post_create(struct socket *sock, int family, | |
1960 | int type, int protocol, int kern) | |
1961 | { | |
2e1d146a | 1962 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1963 | return 0; |
1964 | /* | |
1965 | * Set the outbound netlbl. | |
1966 | */ | |
6d3dc07c CS |
1967 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1968 | } | |
1969 | ||
6d3dc07c CS |
1970 | /** |
1971 | * smack_socket_connect - connect access check | |
1972 | * @sock: the socket | |
1973 | * @sap: the other end | |
1974 | * @addrlen: size of sap | |
1975 | * | |
1976 | * Verifies that a connection may be possible | |
1977 | * | |
1978 | * Returns 0 on success, and error code otherwise | |
1979 | */ | |
1980 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1981 | int addrlen) | |
1982 | { | |
6d3dc07c CS |
1983 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1984 | return 0; | |
6d3dc07c CS |
1985 | if (addrlen < sizeof(struct sockaddr_in)) |
1986 | return -EINVAL; | |
1987 | ||
07feee8f | 1988 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1989 | } |
1990 | ||
1991 | /** | |
1992 | * smack_flags_to_may - convert S_ to MAY_ values | |
1993 | * @flags: the S_ value | |
1994 | * | |
1995 | * Returns the equivalent MAY_ value | |
1996 | */ | |
1997 | static int smack_flags_to_may(int flags) | |
1998 | { | |
1999 | int may = 0; | |
2000 | ||
2001 | if (flags & S_IRUGO) | |
2002 | may |= MAY_READ; | |
2003 | if (flags & S_IWUGO) | |
2004 | may |= MAY_WRITE; | |
2005 | if (flags & S_IXUGO) | |
2006 | may |= MAY_EXEC; | |
2007 | ||
2008 | return may; | |
2009 | } | |
2010 | ||
2011 | /** | |
2012 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2013 | * @msg: the object | |
2014 | * | |
2015 | * Returns 0 | |
2016 | */ | |
2017 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2018 | { | |
676dac4b | 2019 | msg->security = smk_of_current(); |
e114e473 CS |
2020 | return 0; |
2021 | } | |
2022 | ||
2023 | /** | |
2024 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2025 | * @msg: the object | |
2026 | * | |
2027 | * Clears the blob pointer | |
2028 | */ | |
2029 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2030 | { | |
2031 | msg->security = NULL; | |
2032 | } | |
2033 | ||
2034 | /** | |
2035 | * smack_of_shm - the smack pointer for the shm | |
2036 | * @shp: the object | |
2037 | * | |
2038 | * Returns a pointer to the smack value | |
2039 | */ | |
2040 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2041 | { | |
2042 | return (char *)shp->shm_perm.security; | |
2043 | } | |
2044 | ||
2045 | /** | |
2046 | * smack_shm_alloc_security - Set the security blob for shm | |
2047 | * @shp: the object | |
2048 | * | |
2049 | * Returns 0 | |
2050 | */ | |
2051 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2052 | { | |
2053 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2054 | ||
676dac4b | 2055 | isp->security = smk_of_current(); |
e114e473 CS |
2056 | return 0; |
2057 | } | |
2058 | ||
2059 | /** | |
2060 | * smack_shm_free_security - Clear the security blob for shm | |
2061 | * @shp: the object | |
2062 | * | |
2063 | * Clears the blob pointer | |
2064 | */ | |
2065 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2066 | { | |
2067 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2068 | ||
2069 | isp->security = NULL; | |
2070 | } | |
2071 | ||
ecfcc53f EB |
2072 | /** |
2073 | * smk_curacc_shm : check if current has access on shm | |
2074 | * @shp : the object | |
2075 | * @access : access requested | |
2076 | * | |
2077 | * Returns 0 if current has the requested access, error code otherwise | |
2078 | */ | |
2079 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2080 | { | |
2081 | char *ssp = smack_of_shm(shp); | |
2082 | struct smk_audit_info ad; | |
2083 | ||
2084 | #ifdef CONFIG_AUDIT | |
2085 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2086 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2087 | #endif | |
2088 | return smk_curacc(ssp, access, &ad); | |
2089 | } | |
2090 | ||
e114e473 CS |
2091 | /** |
2092 | * smack_shm_associate - Smack access check for shm | |
2093 | * @shp: the object | |
2094 | * @shmflg: access requested | |
2095 | * | |
2096 | * Returns 0 if current has the requested access, error code otherwise | |
2097 | */ | |
2098 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2099 | { | |
e114e473 CS |
2100 | int may; |
2101 | ||
2102 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2103 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2104 | } |
2105 | ||
2106 | /** | |
2107 | * smack_shm_shmctl - Smack access check for shm | |
2108 | * @shp: the object | |
2109 | * @cmd: what it wants to do | |
2110 | * | |
2111 | * Returns 0 if current has the requested access, error code otherwise | |
2112 | */ | |
2113 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2114 | { | |
e114e473 CS |
2115 | int may; |
2116 | ||
2117 | switch (cmd) { | |
2118 | case IPC_STAT: | |
2119 | case SHM_STAT: | |
2120 | may = MAY_READ; | |
2121 | break; | |
2122 | case IPC_SET: | |
2123 | case SHM_LOCK: | |
2124 | case SHM_UNLOCK: | |
2125 | case IPC_RMID: | |
2126 | may = MAY_READWRITE; | |
2127 | break; | |
2128 | case IPC_INFO: | |
2129 | case SHM_INFO: | |
2130 | /* | |
2131 | * System level information. | |
2132 | */ | |
2133 | return 0; | |
2134 | default: | |
2135 | return -EINVAL; | |
2136 | } | |
ecfcc53f | 2137 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2138 | } |
2139 | ||
2140 | /** | |
2141 | * smack_shm_shmat - Smack access for shmat | |
2142 | * @shp: the object | |
2143 | * @shmaddr: unused | |
2144 | * @shmflg: access requested | |
2145 | * | |
2146 | * Returns 0 if current has the requested access, error code otherwise | |
2147 | */ | |
2148 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2149 | int shmflg) | |
2150 | { | |
e114e473 CS |
2151 | int may; |
2152 | ||
2153 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2154 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2155 | } |
2156 | ||
2157 | /** | |
2158 | * smack_of_sem - the smack pointer for the sem | |
2159 | * @sma: the object | |
2160 | * | |
2161 | * Returns a pointer to the smack value | |
2162 | */ | |
2163 | static char *smack_of_sem(struct sem_array *sma) | |
2164 | { | |
2165 | return (char *)sma->sem_perm.security; | |
2166 | } | |
2167 | ||
2168 | /** | |
2169 | * smack_sem_alloc_security - Set the security blob for sem | |
2170 | * @sma: the object | |
2171 | * | |
2172 | * Returns 0 | |
2173 | */ | |
2174 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2175 | { | |
2176 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2177 | ||
676dac4b | 2178 | isp->security = smk_of_current(); |
e114e473 CS |
2179 | return 0; |
2180 | } | |
2181 | ||
2182 | /** | |
2183 | * smack_sem_free_security - Clear the security blob for sem | |
2184 | * @sma: the object | |
2185 | * | |
2186 | * Clears the blob pointer | |
2187 | */ | |
2188 | static void smack_sem_free_security(struct sem_array *sma) | |
2189 | { | |
2190 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2191 | ||
2192 | isp->security = NULL; | |
2193 | } | |
2194 | ||
ecfcc53f EB |
2195 | /** |
2196 | * smk_curacc_sem : check if current has access on sem | |
2197 | * @sma : the object | |
2198 | * @access : access requested | |
2199 | * | |
2200 | * Returns 0 if current has the requested access, error code otherwise | |
2201 | */ | |
2202 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2203 | { | |
2204 | char *ssp = smack_of_sem(sma); | |
2205 | struct smk_audit_info ad; | |
2206 | ||
2207 | #ifdef CONFIG_AUDIT | |
2208 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2209 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2210 | #endif | |
2211 | return smk_curacc(ssp, access, &ad); | |
2212 | } | |
2213 | ||
e114e473 CS |
2214 | /** |
2215 | * smack_sem_associate - Smack access check for sem | |
2216 | * @sma: the object | |
2217 | * @semflg: access requested | |
2218 | * | |
2219 | * Returns 0 if current has the requested access, error code otherwise | |
2220 | */ | |
2221 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2222 | { | |
e114e473 CS |
2223 | int may; |
2224 | ||
2225 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2226 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2227 | } |
2228 | ||
2229 | /** | |
2230 | * smack_sem_shmctl - Smack access check for sem | |
2231 | * @sma: the object | |
2232 | * @cmd: what it wants to do | |
2233 | * | |
2234 | * Returns 0 if current has the requested access, error code otherwise | |
2235 | */ | |
2236 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2237 | { | |
e114e473 CS |
2238 | int may; |
2239 | ||
2240 | switch (cmd) { | |
2241 | case GETPID: | |
2242 | case GETNCNT: | |
2243 | case GETZCNT: | |
2244 | case GETVAL: | |
2245 | case GETALL: | |
2246 | case IPC_STAT: | |
2247 | case SEM_STAT: | |
2248 | may = MAY_READ; | |
2249 | break; | |
2250 | case SETVAL: | |
2251 | case SETALL: | |
2252 | case IPC_RMID: | |
2253 | case IPC_SET: | |
2254 | may = MAY_READWRITE; | |
2255 | break; | |
2256 | case IPC_INFO: | |
2257 | case SEM_INFO: | |
2258 | /* | |
2259 | * System level information | |
2260 | */ | |
2261 | return 0; | |
2262 | default: | |
2263 | return -EINVAL; | |
2264 | } | |
2265 | ||
ecfcc53f | 2266 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2267 | } |
2268 | ||
2269 | /** | |
2270 | * smack_sem_semop - Smack checks of semaphore operations | |
2271 | * @sma: the object | |
2272 | * @sops: unused | |
2273 | * @nsops: unused | |
2274 | * @alter: unused | |
2275 | * | |
2276 | * Treated as read and write in all cases. | |
2277 | * | |
2278 | * Returns 0 if access is allowed, error code otherwise | |
2279 | */ | |
2280 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2281 | unsigned nsops, int alter) | |
2282 | { | |
ecfcc53f | 2283 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2284 | } |
2285 | ||
2286 | /** | |
2287 | * smack_msg_alloc_security - Set the security blob for msg | |
2288 | * @msq: the object | |
2289 | * | |
2290 | * Returns 0 | |
2291 | */ | |
2292 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2293 | { | |
2294 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2295 | ||
676dac4b | 2296 | kisp->security = smk_of_current(); |
e114e473 CS |
2297 | return 0; |
2298 | } | |
2299 | ||
2300 | /** | |
2301 | * smack_msg_free_security - Clear the security blob for msg | |
2302 | * @msq: the object | |
2303 | * | |
2304 | * Clears the blob pointer | |
2305 | */ | |
2306 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2307 | { | |
2308 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2309 | ||
2310 | kisp->security = NULL; | |
2311 | } | |
2312 | ||
2313 | /** | |
2314 | * smack_of_msq - the smack pointer for the msq | |
2315 | * @msq: the object | |
2316 | * | |
2317 | * Returns a pointer to the smack value | |
2318 | */ | |
2319 | static char *smack_of_msq(struct msg_queue *msq) | |
2320 | { | |
2321 | return (char *)msq->q_perm.security; | |
2322 | } | |
2323 | ||
ecfcc53f EB |
2324 | /** |
2325 | * smk_curacc_msq : helper to check if current has access on msq | |
2326 | * @msq : the msq | |
2327 | * @access : access requested | |
2328 | * | |
2329 | * return 0 if current has access, error otherwise | |
2330 | */ | |
2331 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2332 | { | |
2333 | char *msp = smack_of_msq(msq); | |
2334 | struct smk_audit_info ad; | |
2335 | ||
2336 | #ifdef CONFIG_AUDIT | |
2337 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2338 | ad.a.u.ipc_id = msq->q_perm.id; | |
2339 | #endif | |
2340 | return smk_curacc(msp, access, &ad); | |
2341 | } | |
2342 | ||
e114e473 CS |
2343 | /** |
2344 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2345 | * @msq: the object | |
2346 | * @msqflg: access requested | |
2347 | * | |
2348 | * Returns 0 if current has the requested access, error code otherwise | |
2349 | */ | |
2350 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2351 | { | |
e114e473 CS |
2352 | int may; |
2353 | ||
2354 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2355 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2356 | } |
2357 | ||
2358 | /** | |
2359 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2360 | * @msq: the object | |
2361 | * @cmd: what it wants to do | |
2362 | * | |
2363 | * Returns 0 if current has the requested access, error code otherwise | |
2364 | */ | |
2365 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2366 | { | |
e114e473 CS |
2367 | int may; |
2368 | ||
2369 | switch (cmd) { | |
2370 | case IPC_STAT: | |
2371 | case MSG_STAT: | |
2372 | may = MAY_READ; | |
2373 | break; | |
2374 | case IPC_SET: | |
2375 | case IPC_RMID: | |
2376 | may = MAY_READWRITE; | |
2377 | break; | |
2378 | case IPC_INFO: | |
2379 | case MSG_INFO: | |
2380 | /* | |
2381 | * System level information | |
2382 | */ | |
2383 | return 0; | |
2384 | default: | |
2385 | return -EINVAL; | |
2386 | } | |
2387 | ||
ecfcc53f | 2388 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2389 | } |
2390 | ||
2391 | /** | |
2392 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2393 | * @msq: the object | |
2394 | * @msg: unused | |
2395 | * @msqflg: access requested | |
2396 | * | |
2397 | * Returns 0 if current has the requested access, error code otherwise | |
2398 | */ | |
2399 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2400 | int msqflg) | |
2401 | { | |
ecfcc53f | 2402 | int may; |
e114e473 | 2403 | |
ecfcc53f EB |
2404 | may = smack_flags_to_may(msqflg); |
2405 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2406 | } |
2407 | ||
2408 | /** | |
2409 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2410 | * @msq: the object | |
2411 | * @msg: unused | |
2412 | * @target: unused | |
2413 | * @type: unused | |
2414 | * @mode: unused | |
2415 | * | |
2416 | * Returns 0 if current has read and write access, error code otherwise | |
2417 | */ | |
2418 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2419 | struct task_struct *target, long type, int mode) | |
2420 | { | |
ecfcc53f | 2421 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2422 | } |
2423 | ||
2424 | /** | |
2425 | * smack_ipc_permission - Smack access for ipc_permission() | |
2426 | * @ipp: the object permissions | |
2427 | * @flag: access requested | |
2428 | * | |
2429 | * Returns 0 if current has read and write access, error code otherwise | |
2430 | */ | |
2431 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2432 | { | |
2433 | char *isp = ipp->security; | |
ecfcc53f EB |
2434 | int may = smack_flags_to_may(flag); |
2435 | struct smk_audit_info ad; | |
e114e473 | 2436 | |
ecfcc53f EB |
2437 | #ifdef CONFIG_AUDIT |
2438 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2439 | ad.a.u.ipc_id = ipp->id; | |
2440 | #endif | |
2441 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2442 | } |
2443 | ||
d20bdda6 AD |
2444 | /** |
2445 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2446 | * @ipp: the object permissions |
d20bdda6 AD |
2447 | * @secid: where result will be saved |
2448 | */ | |
2449 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2450 | { | |
2451 | char *smack = ipp->security; | |
2452 | ||
2453 | *secid = smack_to_secid(smack); | |
2454 | } | |
2455 | ||
e114e473 CS |
2456 | /** |
2457 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2458 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2459 | * @inode: the object |
2460 | * | |
2461 | * Set the inode's security blob if it hasn't been done already. | |
2462 | */ | |
2463 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2464 | { | |
2465 | struct super_block *sbp; | |
2466 | struct superblock_smack *sbsp; | |
2467 | struct inode_smack *isp; | |
676dac4b | 2468 | char *csp = smk_of_current(); |
e114e473 CS |
2469 | char *fetched; |
2470 | char *final; | |
5c6d1125 JS |
2471 | char trattr[TRANS_TRUE_SIZE]; |
2472 | int transflag = 0; | |
e114e473 CS |
2473 | struct dentry *dp; |
2474 | ||
2475 | if (inode == NULL) | |
2476 | return; | |
2477 | ||
2478 | isp = inode->i_security; | |
2479 | ||
2480 | mutex_lock(&isp->smk_lock); | |
2481 | /* | |
2482 | * If the inode is already instantiated | |
2483 | * take the quick way out | |
2484 | */ | |
2485 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2486 | goto unlockandout; | |
2487 | ||
2488 | sbp = inode->i_sb; | |
2489 | sbsp = sbp->s_security; | |
2490 | /* | |
2491 | * We're going to use the superblock default label | |
2492 | * if there's no label on the file. | |
2493 | */ | |
2494 | final = sbsp->smk_default; | |
2495 | ||
e97dcb0e CS |
2496 | /* |
2497 | * If this is the root inode the superblock | |
2498 | * may be in the process of initialization. | |
2499 | * If that is the case use the root value out | |
2500 | * of the superblock. | |
2501 | */ | |
2502 | if (opt_dentry->d_parent == opt_dentry) { | |
2503 | isp->smk_inode = sbsp->smk_root; | |
2504 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2505 | goto unlockandout; | |
2506 | } | |
2507 | ||
e114e473 CS |
2508 | /* |
2509 | * This is pretty hackish. | |
2510 | * Casey says that we shouldn't have to do | |
2511 | * file system specific code, but it does help | |
2512 | * with keeping it simple. | |
2513 | */ | |
2514 | switch (sbp->s_magic) { | |
2515 | case SMACK_MAGIC: | |
2516 | /* | |
2517 | * Casey says that it's a little embarassing | |
2518 | * that the smack file system doesn't do | |
2519 | * extended attributes. | |
2520 | */ | |
2521 | final = smack_known_star.smk_known; | |
2522 | break; | |
2523 | case PIPEFS_MAGIC: | |
2524 | /* | |
2525 | * Casey says pipes are easy (?) | |
2526 | */ | |
2527 | final = smack_known_star.smk_known; | |
2528 | break; | |
2529 | case DEVPTS_SUPER_MAGIC: | |
2530 | /* | |
2531 | * devpts seems content with the label of the task. | |
2532 | * Programs that change smack have to treat the | |
2533 | * pty with respect. | |
2534 | */ | |
2535 | final = csp; | |
2536 | break; | |
2537 | case SOCKFS_MAGIC: | |
2538 | /* | |
b4e0d5f0 CS |
2539 | * Socket access is controlled by the socket |
2540 | * structures associated with the task involved. | |
e114e473 | 2541 | */ |
b4e0d5f0 | 2542 | final = smack_known_star.smk_known; |
e114e473 CS |
2543 | break; |
2544 | case PROC_SUPER_MAGIC: | |
2545 | /* | |
2546 | * Casey says procfs appears not to care. | |
2547 | * The superblock default suffices. | |
2548 | */ | |
2549 | break; | |
2550 | case TMPFS_MAGIC: | |
2551 | /* | |
2552 | * Device labels should come from the filesystem, | |
2553 | * but watch out, because they're volitile, | |
2554 | * getting recreated on every reboot. | |
2555 | */ | |
2556 | final = smack_known_star.smk_known; | |
2557 | /* | |
2558 | * No break. | |
2559 | * | |
2560 | * If a smack value has been set we want to use it, | |
2561 | * but since tmpfs isn't giving us the opportunity | |
2562 | * to set mount options simulate setting the | |
2563 | * superblock default. | |
2564 | */ | |
2565 | default: | |
2566 | /* | |
2567 | * This isn't an understood special case. | |
2568 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2569 | */ |
2570 | ||
2571 | /* | |
2572 | * UNIX domain sockets use lower level socket data. | |
2573 | */ | |
2574 | if (S_ISSOCK(inode->i_mode)) { | |
2575 | final = smack_known_star.smk_known; | |
2576 | break; | |
2577 | } | |
2578 | /* | |
e114e473 CS |
2579 | * No xattr support means, alas, no SMACK label. |
2580 | * Use the aforeapplied default. | |
2581 | * It would be curious if the label of the task | |
2582 | * does not match that assigned. | |
2583 | */ | |
2584 | if (inode->i_op->getxattr == NULL) | |
2585 | break; | |
2586 | /* | |
2587 | * Get the dentry for xattr. | |
2588 | */ | |
3e62cbb8 | 2589 | dp = dget(opt_dentry); |
676dac4b | 2590 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
5c6d1125 | 2591 | if (fetched != NULL) { |
e114e473 | 2592 | final = fetched; |
5c6d1125 JS |
2593 | if (S_ISDIR(inode->i_mode)) { |
2594 | trattr[0] = '\0'; | |
2595 | inode->i_op->getxattr(dp, | |
2596 | XATTR_NAME_SMACKTRANSMUTE, | |
2597 | trattr, TRANS_TRUE_SIZE); | |
2598 | if (strncmp(trattr, TRANS_TRUE, | |
2599 | TRANS_TRUE_SIZE) == 0) | |
2600 | transflag = SMK_INODE_TRANSMUTE; | |
2601 | } | |
2602 | } | |
2603 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2604 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2605 | |
e114e473 CS |
2606 | dput(dp); |
2607 | break; | |
2608 | } | |
2609 | ||
2610 | if (final == NULL) | |
2611 | isp->smk_inode = csp; | |
2612 | else | |
2613 | isp->smk_inode = final; | |
2614 | ||
5c6d1125 | 2615 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2616 | |
2617 | unlockandout: | |
2618 | mutex_unlock(&isp->smk_lock); | |
2619 | return; | |
2620 | } | |
2621 | ||
2622 | /** | |
2623 | * smack_getprocattr - Smack process attribute access | |
2624 | * @p: the object task | |
2625 | * @name: the name of the attribute in /proc/.../attr | |
2626 | * @value: where to put the result | |
2627 | * | |
2628 | * Places a copy of the task Smack into value | |
2629 | * | |
2630 | * Returns the length of the smack label or an error code | |
2631 | */ | |
2632 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2633 | { | |
2634 | char *cp; | |
2635 | int slen; | |
2636 | ||
2637 | if (strcmp(name, "current") != 0) | |
2638 | return -EINVAL; | |
2639 | ||
676dac4b | 2640 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2641 | if (cp == NULL) |
2642 | return -ENOMEM; | |
2643 | ||
2644 | slen = strlen(cp); | |
2645 | *value = cp; | |
2646 | return slen; | |
2647 | } | |
2648 | ||
2649 | /** | |
2650 | * smack_setprocattr - Smack process attribute setting | |
2651 | * @p: the object task | |
2652 | * @name: the name of the attribute in /proc/.../attr | |
2653 | * @value: the value to set | |
2654 | * @size: the size of the value | |
2655 | * | |
2656 | * Sets the Smack value of the task. Only setting self | |
2657 | * is permitted and only with privilege | |
2658 | * | |
2659 | * Returns the length of the smack label or an error code | |
2660 | */ | |
2661 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2662 | void *value, size_t size) | |
2663 | { | |
7898e1f8 | 2664 | int rc; |
676dac4b | 2665 | struct task_smack *tsp; |
5c6d1125 | 2666 | struct task_smack *oldtsp; |
d84f4f99 | 2667 | struct cred *new; |
e114e473 CS |
2668 | char *newsmack; |
2669 | ||
e114e473 CS |
2670 | /* |
2671 | * Changing another process' Smack value is too dangerous | |
2672 | * and supports no sane use case. | |
2673 | */ | |
2674 | if (p != current) | |
2675 | return -EPERM; | |
2676 | ||
5cd9c58f DH |
2677 | if (!capable(CAP_MAC_ADMIN)) |
2678 | return -EPERM; | |
2679 | ||
e114e473 CS |
2680 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2681 | return -EINVAL; | |
2682 | ||
2683 | if (strcmp(name, "current") != 0) | |
2684 | return -EINVAL; | |
2685 | ||
2686 | newsmack = smk_import(value, size); | |
2687 | if (newsmack == NULL) | |
2688 | return -EINVAL; | |
2689 | ||
6d3dc07c CS |
2690 | /* |
2691 | * No process is ever allowed the web ("@") label. | |
2692 | */ | |
2693 | if (newsmack == smack_known_web.smk_known) | |
2694 | return -EPERM; | |
2695 | ||
5c6d1125 | 2696 | oldtsp = p->cred->security; |
d84f4f99 | 2697 | new = prepare_creds(); |
6d3dc07c | 2698 | if (new == NULL) |
d84f4f99 | 2699 | return -ENOMEM; |
7898e1f8 CS |
2700 | |
2701 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2702 | if (tsp == NULL) { |
2703 | kfree(new); | |
2704 | return -ENOMEM; | |
2705 | } | |
7898e1f8 CS |
2706 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2707 | if (rc != 0) | |
2708 | return rc; | |
2709 | ||
676dac4b | 2710 | new->security = tsp; |
d84f4f99 | 2711 | commit_creds(new); |
e114e473 CS |
2712 | return size; |
2713 | } | |
2714 | ||
2715 | /** | |
2716 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2717 | * @sock: one sock |
2718 | * @other: the other sock | |
e114e473 CS |
2719 | * @newsk: unused |
2720 | * | |
2721 | * Return 0 if a subject with the smack of sock could access | |
2722 | * an object with the smack of other, otherwise an error code | |
2723 | */ | |
3610cda5 DM |
2724 | static int smack_unix_stream_connect(struct sock *sock, |
2725 | struct sock *other, struct sock *newsk) | |
e114e473 | 2726 | { |
d2e7ad19 JM |
2727 | struct socket_smack *ssp = sock->sk_security; |
2728 | struct socket_smack *osp = other->sk_security; | |
ecfcc53f | 2729 | struct smk_audit_info ad; |
b4e0d5f0 | 2730 | int rc = 0; |
e114e473 | 2731 | |
ecfcc53f | 2732 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
3610cda5 | 2733 | smk_ad_setfield_u_net_sk(&ad, other); |
b4e0d5f0 CS |
2734 | |
2735 | if (!capable(CAP_MAC_OVERRIDE)) | |
2736 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2737 | ||
2738 | return rc; | |
e114e473 CS |
2739 | } |
2740 | ||
2741 | /** | |
2742 | * smack_unix_may_send - Smack access on UDS | |
2743 | * @sock: one socket | |
2744 | * @other: the other socket | |
2745 | * | |
2746 | * Return 0 if a subject with the smack of sock could access | |
2747 | * an object with the smack of other, otherwise an error code | |
2748 | */ | |
2749 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2750 | { | |
b4e0d5f0 CS |
2751 | struct socket_smack *ssp = sock->sk->sk_security; |
2752 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2753 | struct smk_audit_info ad; |
b4e0d5f0 | 2754 | int rc = 0; |
e114e473 | 2755 | |
ecfcc53f EB |
2756 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2757 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2758 | |
2759 | if (!capable(CAP_MAC_OVERRIDE)) | |
2760 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2761 | ||
2762 | return rc; | |
e114e473 CS |
2763 | } |
2764 | ||
6d3dc07c CS |
2765 | /** |
2766 | * smack_socket_sendmsg - Smack check based on destination host | |
2767 | * @sock: the socket | |
251a2a95 | 2768 | * @msg: the message |
6d3dc07c CS |
2769 | * @size: the size of the message |
2770 | * | |
2771 | * Return 0 if the current subject can write to the destination | |
2772 | * host. This is only a question if the destination is a single | |
2773 | * label host. | |
2774 | */ | |
2775 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2776 | int size) | |
2777 | { | |
2778 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2779 | |
2780 | /* | |
2781 | * Perfectly reasonable for this to be NULL | |
2782 | */ | |
da34d424 | 2783 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2784 | return 0; |
2785 | ||
07feee8f | 2786 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2787 | } |
2788 | ||
2789 | ||
e114e473 | 2790 | /** |
251a2a95 | 2791 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2792 | * @sap: netlabel secattr |
2793 | * @sip: where to put the result | |
2794 | * | |
2795 | * Copies a smack label into sip | |
2796 | */ | |
2797 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2798 | { | |
2799 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2800 | char *sp; |
e114e473 CS |
2801 | int pcat; |
2802 | ||
6d3dc07c | 2803 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2804 | /* |
6d3dc07c | 2805 | * Looks like a CIPSO packet. |
e114e473 CS |
2806 | * If there are flags but no level netlabel isn't |
2807 | * behaving the way we expect it to. | |
2808 | * | |
6d3dc07c | 2809 | * Get the categories, if any |
e114e473 CS |
2810 | * Without guidance regarding the smack value |
2811 | * for the packet fall back on the network | |
2812 | * ambient value. | |
2813 | */ | |
6d3dc07c CS |
2814 | memset(smack, '\0', SMK_LABELLEN); |
2815 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2816 | for (pcat = -1;;) { | |
2817 | pcat = netlbl_secattr_catmap_walk( | |
2818 | sap->attr.mls.cat, pcat + 1); | |
2819 | if (pcat < 0) | |
2820 | break; | |
2821 | smack_catset_bit(pcat, smack); | |
2822 | } | |
2823 | /* | |
2824 | * If it is CIPSO using smack direct mapping | |
2825 | * we are already done. WeeHee. | |
2826 | */ | |
2827 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2828 | memcpy(sip, smack, SMK_MAXLEN); | |
2829 | return; | |
2830 | } | |
2831 | /* | |
2832 | * Look it up in the supplied table if it is not | |
2833 | * a direct mapping. | |
2834 | */ | |
2835 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2836 | return; |
2837 | } | |
6d3dc07c CS |
2838 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2839 | /* | |
2840 | * Looks like a fallback, which gives us a secid. | |
2841 | */ | |
2842 | sp = smack_from_secid(sap->attr.secid); | |
2843 | /* | |
2844 | * This has got to be a bug because it is | |
2845 | * impossible to specify a fallback without | |
2846 | * specifying the label, which will ensure | |
2847 | * it has a secid, and the only way to get a | |
2848 | * secid is from a fallback. | |
2849 | */ | |
2850 | BUG_ON(sp == NULL); | |
2851 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2852 | return; |
2853 | } | |
2854 | /* | |
6d3dc07c CS |
2855 | * Without guidance regarding the smack value |
2856 | * for the packet fall back on the network | |
2857 | * ambient value. | |
e114e473 | 2858 | */ |
6d3dc07c | 2859 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2860 | return; |
2861 | } | |
2862 | ||
2863 | /** | |
2864 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2865 | * @sk: socket | |
2866 | * @skb: packet | |
2867 | * | |
2868 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2869 | */ | |
2870 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2871 | { | |
2872 | struct netlbl_lsm_secattr secattr; | |
2873 | struct socket_smack *ssp = sk->sk_security; | |
2874 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2875 | char *csp; |
e114e473 | 2876 | int rc; |
ecfcc53f | 2877 | struct smk_audit_info ad; |
e114e473 CS |
2878 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2879 | return 0; | |
2880 | ||
2881 | /* | |
2882 | * Translate what netlabel gave us. | |
2883 | */ | |
e114e473 | 2884 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2885 | |
e114e473 | 2886 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2887 | if (rc == 0) { |
e114e473 | 2888 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2889 | csp = smack; |
2890 | } else | |
2891 | csp = smack_net_ambient; | |
2892 | ||
e114e473 | 2893 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2894 | |
ecfcc53f EB |
2895 | #ifdef CONFIG_AUDIT |
2896 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2897 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 2898 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2899 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2900 | #endif | |
e114e473 CS |
2901 | /* |
2902 | * Receiving a packet requires that the other end | |
2903 | * be able to write here. Read access is not required. | |
2904 | * This is the simplist possible security model | |
2905 | * for networking. | |
2906 | */ | |
ecfcc53f | 2907 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2908 | if (rc != 0) |
2909 | netlbl_skbuff_err(skb, rc, 0); | |
2910 | return rc; | |
e114e473 CS |
2911 | } |
2912 | ||
2913 | /** | |
2914 | * smack_socket_getpeersec_stream - pull in packet label | |
2915 | * @sock: the socket | |
2916 | * @optval: user's destination | |
2917 | * @optlen: size thereof | |
251a2a95 | 2918 | * @len: max thereof |
e114e473 CS |
2919 | * |
2920 | * returns zero on success, an error code otherwise | |
2921 | */ | |
2922 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2923 | char __user *optval, | |
2924 | int __user *optlen, unsigned len) | |
2925 | { | |
2926 | struct socket_smack *ssp; | |
2927 | int slen; | |
2928 | int rc = 0; | |
2929 | ||
2930 | ssp = sock->sk->sk_security; | |
2931 | slen = strlen(ssp->smk_packet) + 1; | |
2932 | ||
2933 | if (slen > len) | |
2934 | rc = -ERANGE; | |
2935 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2936 | rc = -EFAULT; | |
2937 | ||
2938 | if (put_user(slen, optlen) != 0) | |
2939 | rc = -EFAULT; | |
2940 | ||
2941 | return rc; | |
2942 | } | |
2943 | ||
2944 | ||
2945 | /** | |
2946 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 2947 | * @sock: the peer socket |
e114e473 CS |
2948 | * @skb: packet data |
2949 | * @secid: pointer to where to put the secid of the packet | |
2950 | * | |
2951 | * Sets the netlabel socket state on sk from parent | |
2952 | */ | |
2953 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2954 | struct sk_buff *skb, u32 *secid) | |
2955 | ||
2956 | { | |
2957 | struct netlbl_lsm_secattr secattr; | |
b4e0d5f0 | 2958 | struct socket_smack *sp; |
e114e473 | 2959 | char smack[SMK_LABELLEN]; |
b4e0d5f0 CS |
2960 | int family = PF_UNSPEC; |
2961 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
2962 | int rc; |
2963 | ||
b4e0d5f0 CS |
2964 | if (skb != NULL) { |
2965 | if (skb->protocol == htons(ETH_P_IP)) | |
2966 | family = PF_INET; | |
2967 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
2968 | family = PF_INET6; | |
e114e473 | 2969 | } |
b4e0d5f0 CS |
2970 | if (family == PF_UNSPEC && sock != NULL) |
2971 | family = sock->sk->sk_family; | |
e114e473 | 2972 | |
b4e0d5f0 CS |
2973 | if (family == PF_UNIX) { |
2974 | sp = sock->sk->sk_security; | |
2975 | s = smack_to_secid(sp->smk_out); | |
2976 | } else if (family == PF_INET || family == PF_INET6) { | |
2977 | /* | |
2978 | * Translate what netlabel gave us. | |
2979 | */ | |
2980 | netlbl_secattr_init(&secattr); | |
2981 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2982 | if (rc == 0) { | |
2983 | smack_from_secattr(&secattr, smack); | |
2984 | s = smack_to_secid(smack); | |
2985 | } | |
2986 | netlbl_secattr_destroy(&secattr); | |
2987 | } | |
2988 | *secid = s; | |
e114e473 CS |
2989 | if (s == 0) |
2990 | return -EINVAL; | |
e114e473 CS |
2991 | return 0; |
2992 | } | |
2993 | ||
2994 | /** | |
07feee8f PM |
2995 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2996 | * @sk: child sock | |
2997 | * @parent: parent socket | |
e114e473 | 2998 | * |
07feee8f PM |
2999 | * Set the smk_{in,out} state of an existing sock based on the process that |
3000 | * is creating the new socket. | |
e114e473 CS |
3001 | */ |
3002 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3003 | { | |
3004 | struct socket_smack *ssp; | |
e114e473 | 3005 | |
07feee8f PM |
3006 | if (sk == NULL || |
3007 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3008 | return; |
3009 | ||
3010 | ssp = sk->sk_security; | |
676dac4b | 3011 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3012 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3013 | } |
3014 | ||
3015 | /** | |
3016 | * smack_inet_conn_request - Smack access check on connect | |
3017 | * @sk: socket involved | |
3018 | * @skb: packet | |
3019 | * @req: unused | |
3020 | * | |
3021 | * Returns 0 if a task with the packet label could write to | |
3022 | * the socket, otherwise an error code | |
3023 | */ | |
3024 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3025 | struct request_sock *req) | |
3026 | { | |
07feee8f | 3027 | u16 family = sk->sk_family; |
e114e473 | 3028 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3029 | struct netlbl_lsm_secattr secattr; |
3030 | struct sockaddr_in addr; | |
3031 | struct iphdr *hdr; | |
e114e473 CS |
3032 | char smack[SMK_LABELLEN]; |
3033 | int rc; | |
ecfcc53f | 3034 | struct smk_audit_info ad; |
e114e473 | 3035 | |
07feee8f PM |
3036 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3037 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3038 | family = PF_INET; | |
e114e473 | 3039 | |
07feee8f PM |
3040 | netlbl_secattr_init(&secattr); |
3041 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3042 | if (rc == 0) |
07feee8f | 3043 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
3044 | else |
3045 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
3046 | netlbl_secattr_destroy(&secattr); |
3047 | ||
ecfcc53f EB |
3048 | #ifdef CONFIG_AUDIT |
3049 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3050 | ad.a.u.net.family = family; | |
8964be4a | 3051 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3052 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3053 | #endif | |
e114e473 | 3054 | /* |
07feee8f PM |
3055 | * Receiving a packet requires that the other end be able to write |
3056 | * here. Read access is not required. | |
e114e473 | 3057 | */ |
ecfcc53f | 3058 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3059 | if (rc != 0) |
3060 | return rc; | |
3061 | ||
3062 | /* | |
3063 | * Save the peer's label in the request_sock so we can later setup | |
3064 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3065 | */ | |
3066 | req->peer_secid = smack_to_secid(smack); | |
3067 | ||
3068 | /* | |
3069 | * We need to decide if we want to label the incoming connection here | |
3070 | * if we do we only need to label the request_sock and the stack will | |
3071 | * propogate the wire-label to the sock when it is created. | |
3072 | */ | |
3073 | hdr = ip_hdr(skb); | |
3074 | addr.sin_addr.s_addr = hdr->saddr; | |
3075 | rcu_read_lock(); | |
3076 | if (smack_host_label(&addr) == NULL) { | |
3077 | rcu_read_unlock(); | |
3078 | netlbl_secattr_init(&secattr); | |
3079 | smack_to_secattr(smack, &secattr); | |
3080 | rc = netlbl_req_setattr(req, &secattr); | |
3081 | netlbl_secattr_destroy(&secattr); | |
3082 | } else { | |
3083 | rcu_read_unlock(); | |
3084 | netlbl_req_delattr(req); | |
3085 | } | |
e114e473 CS |
3086 | |
3087 | return rc; | |
3088 | } | |
3089 | ||
07feee8f PM |
3090 | /** |
3091 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3092 | * @sk: the new socket | |
3093 | * @req: the connection's request_sock | |
3094 | * | |
3095 | * Transfer the connection's peer label to the newly created socket. | |
3096 | */ | |
3097 | static void smack_inet_csk_clone(struct sock *sk, | |
3098 | const struct request_sock *req) | |
3099 | { | |
3100 | struct socket_smack *ssp = sk->sk_security; | |
3101 | char *smack; | |
3102 | ||
3103 | if (req->peer_secid != 0) { | |
3104 | smack = smack_from_secid(req->peer_secid); | |
3105 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
3106 | } else | |
3107 | ssp->smk_packet[0] = '\0'; | |
3108 | } | |
3109 | ||
e114e473 CS |
3110 | /* |
3111 | * Key management security hooks | |
3112 | * | |
3113 | * Casey has not tested key support very heavily. | |
3114 | * The permission check is most likely too restrictive. | |
3115 | * If you care about keys please have a look. | |
3116 | */ | |
3117 | #ifdef CONFIG_KEYS | |
3118 | ||
3119 | /** | |
3120 | * smack_key_alloc - Set the key security blob | |
3121 | * @key: object | |
d84f4f99 | 3122 | * @cred: the credentials to use |
e114e473 CS |
3123 | * @flags: unused |
3124 | * | |
3125 | * No allocation required | |
3126 | * | |
3127 | * Returns 0 | |
3128 | */ | |
d84f4f99 | 3129 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3130 | unsigned long flags) |
3131 | { | |
676dac4b | 3132 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3133 | return 0; |
3134 | } | |
3135 | ||
3136 | /** | |
3137 | * smack_key_free - Clear the key security blob | |
3138 | * @key: the object | |
3139 | * | |
3140 | * Clear the blob pointer | |
3141 | */ | |
3142 | static void smack_key_free(struct key *key) | |
3143 | { | |
3144 | key->security = NULL; | |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * smack_key_permission - Smack access on a key | |
3149 | * @key_ref: gets to the object | |
d84f4f99 | 3150 | * @cred: the credentials to use |
e114e473 CS |
3151 | * @perm: unused |
3152 | * | |
3153 | * Return 0 if the task has read and write to the object, | |
3154 | * an error code otherwise | |
3155 | */ | |
3156 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3157 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3158 | { |
3159 | struct key *keyp; | |
ecfcc53f | 3160 | struct smk_audit_info ad; |
676dac4b | 3161 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3162 | |
3163 | keyp = key_ref_to_ptr(key_ref); | |
3164 | if (keyp == NULL) | |
3165 | return -EINVAL; | |
3166 | /* | |
3167 | * If the key hasn't been initialized give it access so that | |
3168 | * it may do so. | |
3169 | */ | |
3170 | if (keyp->security == NULL) | |
3171 | return 0; | |
3172 | /* | |
3173 | * This should not occur | |
3174 | */ | |
676dac4b | 3175 | if (tsp == NULL) |
e114e473 | 3176 | return -EACCES; |
ecfcc53f EB |
3177 | #ifdef CONFIG_AUDIT |
3178 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3179 | ad.a.u.key_struct.key = keyp->serial; | |
3180 | ad.a.u.key_struct.key_desc = keyp->description; | |
3181 | #endif | |
676dac4b | 3182 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3183 | MAY_READWRITE, &ad); |
e114e473 CS |
3184 | } |
3185 | #endif /* CONFIG_KEYS */ | |
3186 | ||
d20bdda6 AD |
3187 | /* |
3188 | * Smack Audit hooks | |
3189 | * | |
3190 | * Audit requires a unique representation of each Smack specific | |
3191 | * rule. This unique representation is used to distinguish the | |
3192 | * object to be audited from remaining kernel objects and also | |
3193 | * works as a glue between the audit hooks. | |
3194 | * | |
3195 | * Since repository entries are added but never deleted, we'll use | |
3196 | * the smack_known label address related to the given audit rule as | |
3197 | * the needed unique representation. This also better fits the smack | |
3198 | * model where nearly everything is a label. | |
3199 | */ | |
3200 | #ifdef CONFIG_AUDIT | |
3201 | ||
3202 | /** | |
3203 | * smack_audit_rule_init - Initialize a smack audit rule | |
3204 | * @field: audit rule fields given from user-space (audit.h) | |
3205 | * @op: required testing operator (=, !=, >, <, ...) | |
3206 | * @rulestr: smack label to be audited | |
3207 | * @vrule: pointer to save our own audit rule representation | |
3208 | * | |
3209 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3210 | * The label to be audited is created if necessay. | |
3211 | */ | |
3212 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3213 | { | |
3214 | char **rule = (char **)vrule; | |
3215 | *rule = NULL; | |
3216 | ||
3217 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3218 | return -EINVAL; | |
3219 | ||
5af75d8d | 3220 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3221 | return -EINVAL; |
3222 | ||
3223 | *rule = smk_import(rulestr, 0); | |
3224 | ||
3225 | return 0; | |
3226 | } | |
3227 | ||
3228 | /** | |
3229 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3230 | * @krule: rule of interest, in Audit kernel representation format | |
3231 | * | |
3232 | * This is used to filter Smack rules from remaining Audit ones. | |
3233 | * If it's proved that this rule belongs to us, the | |
3234 | * audit_rule_match hook will be called to do the final judgement. | |
3235 | */ | |
3236 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3237 | { | |
3238 | struct audit_field *f; | |
3239 | int i; | |
3240 | ||
3241 | for (i = 0; i < krule->field_count; i++) { | |
3242 | f = &krule->fields[i]; | |
3243 | ||
3244 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3245 | return 1; | |
3246 | } | |
3247 | ||
3248 | return 0; | |
3249 | } | |
3250 | ||
3251 | /** | |
3252 | * smack_audit_rule_match - Audit given object ? | |
3253 | * @secid: security id for identifying the object to test | |
3254 | * @field: audit rule flags given from user-space | |
3255 | * @op: required testing operator | |
3256 | * @vrule: smack internal rule presentation | |
3257 | * @actx: audit context associated with the check | |
3258 | * | |
3259 | * The core Audit hook. It's used to take the decision of | |
3260 | * whether to audit or not to audit a given object. | |
3261 | */ | |
3262 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3263 | struct audit_context *actx) | |
3264 | { | |
3265 | char *smack; | |
3266 | char *rule = vrule; | |
3267 | ||
3268 | if (!rule) { | |
3269 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
3270 | "Smack: missing rule\n"); | |
3271 | return -ENOENT; | |
3272 | } | |
3273 | ||
3274 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3275 | return 0; | |
3276 | ||
3277 | smack = smack_from_secid(secid); | |
3278 | ||
3279 | /* | |
3280 | * No need to do string comparisons. If a match occurs, | |
3281 | * both pointers will point to the same smack_known | |
3282 | * label. | |
3283 | */ | |
5af75d8d | 3284 | if (op == Audit_equal) |
d20bdda6 | 3285 | return (rule == smack); |
5af75d8d | 3286 | if (op == Audit_not_equal) |
d20bdda6 AD |
3287 | return (rule != smack); |
3288 | ||
3289 | return 0; | |
3290 | } | |
3291 | ||
3292 | /** | |
3293 | * smack_audit_rule_free - free smack rule representation | |
3294 | * @vrule: rule to be freed. | |
3295 | * | |
3296 | * No memory was allocated. | |
3297 | */ | |
3298 | static void smack_audit_rule_free(void *vrule) | |
3299 | { | |
3300 | /* No-op */ | |
3301 | } | |
3302 | ||
3303 | #endif /* CONFIG_AUDIT */ | |
3304 | ||
251a2a95 | 3305 | /** |
e114e473 CS |
3306 | * smack_secid_to_secctx - return the smack label for a secid |
3307 | * @secid: incoming integer | |
3308 | * @secdata: destination | |
3309 | * @seclen: how long it is | |
3310 | * | |
3311 | * Exists for networking code. | |
3312 | */ | |
3313 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3314 | { | |
3315 | char *sp = smack_from_secid(secid); | |
3316 | ||
d5630b9d EP |
3317 | if (secdata) |
3318 | *secdata = sp; | |
e114e473 CS |
3319 | *seclen = strlen(sp); |
3320 | return 0; | |
3321 | } | |
3322 | ||
251a2a95 | 3323 | /** |
4bc87e62 CS |
3324 | * smack_secctx_to_secid - return the secid for a smack label |
3325 | * @secdata: smack label | |
3326 | * @seclen: how long result is | |
3327 | * @secid: outgoing integer | |
3328 | * | |
3329 | * Exists for audit and networking code. | |
3330 | */ | |
e52c1764 | 3331 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3332 | { |
3333 | *secid = smack_to_secid(secdata); | |
3334 | return 0; | |
3335 | } | |
3336 | ||
251a2a95 | 3337 | /** |
e114e473 | 3338 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3339 | * @secdata: unused |
3340 | * @seclen: unused | |
e114e473 CS |
3341 | * |
3342 | * Exists to make sure nothing gets done, and properly | |
3343 | */ | |
3344 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3345 | { | |
3346 | } | |
3347 | ||
1ee65e37 DQ |
3348 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3349 | { | |
3350 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3351 | } | |
3352 | ||
3353 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3354 | { | |
3355 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3356 | } | |
3357 | ||
3358 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3359 | { | |
3360 | int len = 0; | |
3361 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3362 | ||
3363 | if (len < 0) | |
3364 | return len; | |
3365 | *ctxlen = len; | |
3366 | return 0; | |
3367 | } | |
3368 | ||
076c54c5 AD |
3369 | struct security_operations smack_ops = { |
3370 | .name = "smack", | |
3371 | ||
9e48858f | 3372 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3373 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3374 | .syslog = smack_syslog, |
e114e473 CS |
3375 | |
3376 | .sb_alloc_security = smack_sb_alloc_security, | |
3377 | .sb_free_security = smack_sb_free_security, | |
3378 | .sb_copy_data = smack_sb_copy_data, | |
3379 | .sb_kern_mount = smack_sb_kern_mount, | |
3380 | .sb_statfs = smack_sb_statfs, | |
3381 | .sb_mount = smack_sb_mount, | |
3382 | .sb_umount = smack_sb_umount, | |
3383 | ||
676dac4b CS |
3384 | .bprm_set_creds = smack_bprm_set_creds, |
3385 | ||
e114e473 CS |
3386 | .inode_alloc_security = smack_inode_alloc_security, |
3387 | .inode_free_security = smack_inode_free_security, | |
3388 | .inode_init_security = smack_inode_init_security, | |
3389 | .inode_link = smack_inode_link, | |
3390 | .inode_unlink = smack_inode_unlink, | |
3391 | .inode_rmdir = smack_inode_rmdir, | |
3392 | .inode_rename = smack_inode_rename, | |
3393 | .inode_permission = smack_inode_permission, | |
3394 | .inode_setattr = smack_inode_setattr, | |
3395 | .inode_getattr = smack_inode_getattr, | |
3396 | .inode_setxattr = smack_inode_setxattr, | |
3397 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3398 | .inode_getxattr = smack_inode_getxattr, | |
3399 | .inode_removexattr = smack_inode_removexattr, | |
3400 | .inode_getsecurity = smack_inode_getsecurity, | |
3401 | .inode_setsecurity = smack_inode_setsecurity, | |
3402 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3403 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3404 | |
3405 | .file_permission = smack_file_permission, | |
3406 | .file_alloc_security = smack_file_alloc_security, | |
3407 | .file_free_security = smack_file_free_security, | |
3408 | .file_ioctl = smack_file_ioctl, | |
3409 | .file_lock = smack_file_lock, | |
3410 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3411 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3412 | .file_set_fowner = smack_file_set_fowner, |
3413 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3414 | .file_receive = smack_file_receive, | |
3415 | ||
ee18d64c | 3416 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3417 | .cred_free = smack_cred_free, |
d84f4f99 | 3418 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3419 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3420 | .kernel_act_as = smack_kernel_act_as, |
3421 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3422 | .task_setpgid = smack_task_setpgid, |
3423 | .task_getpgid = smack_task_getpgid, | |
3424 | .task_getsid = smack_task_getsid, | |
3425 | .task_getsecid = smack_task_getsecid, | |
3426 | .task_setnice = smack_task_setnice, | |
3427 | .task_setioprio = smack_task_setioprio, | |
3428 | .task_getioprio = smack_task_getioprio, | |
3429 | .task_setscheduler = smack_task_setscheduler, | |
3430 | .task_getscheduler = smack_task_getscheduler, | |
3431 | .task_movememory = smack_task_movememory, | |
3432 | .task_kill = smack_task_kill, | |
3433 | .task_wait = smack_task_wait, | |
e114e473 CS |
3434 | .task_to_inode = smack_task_to_inode, |
3435 | ||
3436 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3437 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3438 | |
3439 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3440 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3441 | ||
3442 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3443 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3444 | .msg_queue_associate = smack_msg_queue_associate, | |
3445 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3446 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3447 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3448 | ||
3449 | .shm_alloc_security = smack_shm_alloc_security, | |
3450 | .shm_free_security = smack_shm_free_security, | |
3451 | .shm_associate = smack_shm_associate, | |
3452 | .shm_shmctl = smack_shm_shmctl, | |
3453 | .shm_shmat = smack_shm_shmat, | |
3454 | ||
3455 | .sem_alloc_security = smack_sem_alloc_security, | |
3456 | .sem_free_security = smack_sem_free_security, | |
3457 | .sem_associate = smack_sem_associate, | |
3458 | .sem_semctl = smack_sem_semctl, | |
3459 | .sem_semop = smack_sem_semop, | |
3460 | ||
e114e473 CS |
3461 | .d_instantiate = smack_d_instantiate, |
3462 | ||
3463 | .getprocattr = smack_getprocattr, | |
3464 | .setprocattr = smack_setprocattr, | |
3465 | ||
3466 | .unix_stream_connect = smack_unix_stream_connect, | |
3467 | .unix_may_send = smack_unix_may_send, | |
3468 | ||
3469 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3470 | .socket_connect = smack_socket_connect, |
3471 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3472 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3473 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3474 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3475 | .sk_alloc_security = smack_sk_alloc_security, | |
3476 | .sk_free_security = smack_sk_free_security, | |
3477 | .sock_graft = smack_sock_graft, | |
3478 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3479 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3480 | |
e114e473 CS |
3481 | /* key management security hooks */ |
3482 | #ifdef CONFIG_KEYS | |
3483 | .key_alloc = smack_key_alloc, | |
3484 | .key_free = smack_key_free, | |
3485 | .key_permission = smack_key_permission, | |
3486 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3487 | |
3488 | /* Audit hooks */ | |
3489 | #ifdef CONFIG_AUDIT | |
3490 | .audit_rule_init = smack_audit_rule_init, | |
3491 | .audit_rule_known = smack_audit_rule_known, | |
3492 | .audit_rule_match = smack_audit_rule_match, | |
3493 | .audit_rule_free = smack_audit_rule_free, | |
3494 | #endif /* CONFIG_AUDIT */ | |
3495 | ||
e114e473 | 3496 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3497 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3498 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3499 | .inode_notifysecctx = smack_inode_notifysecctx, |
3500 | .inode_setsecctx = smack_inode_setsecctx, | |
3501 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3502 | }; |
3503 | ||
7198e2ee EB |
3504 | |
3505 | static __init void init_smack_know_list(void) | |
3506 | { | |
3507 | list_add(&smack_known_huh.list, &smack_known_list); | |
3508 | list_add(&smack_known_hat.list, &smack_known_list); | |
3509 | list_add(&smack_known_star.list, &smack_known_list); | |
3510 | list_add(&smack_known_floor.list, &smack_known_list); | |
3511 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3512 | list_add(&smack_known_web.list, &smack_known_list); | |
3513 | } | |
3514 | ||
e114e473 CS |
3515 | /** |
3516 | * smack_init - initialize the smack system | |
3517 | * | |
3518 | * Returns 0 | |
3519 | */ | |
3520 | static __init int smack_init(void) | |
3521 | { | |
d84f4f99 | 3522 | struct cred *cred; |
676dac4b | 3523 | struct task_smack *tsp; |
d84f4f99 | 3524 | |
7898e1f8 CS |
3525 | if (!security_module_enable(&smack_ops)) |
3526 | return 0; | |
3527 | ||
3528 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3529 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3530 | if (tsp == NULL) |
3531 | return -ENOMEM; | |
3532 | ||
e114e473 CS |
3533 | printk(KERN_INFO "Smack: Initializing.\n"); |
3534 | ||
3535 | /* | |
3536 | * Set the security state for the initial task. | |
3537 | */ | |
d84f4f99 | 3538 | cred = (struct cred *) current->cred; |
676dac4b | 3539 | cred->security = tsp; |
e114e473 | 3540 | |
421f91d2 | 3541 | /* initialize the smack_know_list */ |
7198e2ee | 3542 | init_smack_know_list(); |
e114e473 CS |
3543 | /* |
3544 | * Initialize locks | |
3545 | */ | |
e114e473 CS |
3546 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3547 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3548 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3549 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3550 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3551 | ||
3552 | /* | |
3553 | * Register with LSM | |
3554 | */ | |
3555 | if (register_security(&smack_ops)) | |
3556 | panic("smack: Unable to register with kernel.\n"); | |
3557 | ||
3558 | return 0; | |
3559 | } | |
3560 | ||
3561 | /* | |
3562 | * Smack requires early initialization in order to label | |
3563 | * all processes and objects when they are created. | |
3564 | */ | |
3565 | security_initcall(smack_init); |