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Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
e114e473 CS |
31 | #include <linux/mutex.h> |
32 | #include <linux/pipe_fs_i.h> | |
33 | #include <net/netlabel.h> | |
34 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 35 | #include <linux/audit.h> |
1fd7317d | 36 | #include <linux/magic.h> |
2a7dba39 | 37 | #include <linux/dcache.h> |
e114e473 CS |
38 | #include "smack.h" |
39 | ||
c69e8d9c DH |
40 | #define task_security(task) (task_cred_xxx((task), security)) |
41 | ||
5c6d1125 JS |
42 | #define TRANS_TRUE "TRUE" |
43 | #define TRANS_TRUE_SIZE 4 | |
44 | ||
e114e473 CS |
45 | /** |
46 | * smk_fetch - Fetch the smack label from a file. | |
47 | * @ip: a pointer to the inode | |
48 | * @dp: a pointer to the dentry | |
49 | * | |
50 | * Returns a pointer to the master list entry for the Smack label | |
51 | * or NULL if there was no label to fetch. | |
52 | */ | |
676dac4b | 53 | static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp) |
e114e473 CS |
54 | { |
55 | int rc; | |
56 | char in[SMK_LABELLEN]; | |
57 | ||
58 | if (ip->i_op->getxattr == NULL) | |
59 | return NULL; | |
60 | ||
676dac4b | 61 | rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN); |
e114e473 CS |
62 | if (rc < 0) |
63 | return NULL; | |
64 | ||
65 | return smk_import(in, rc); | |
66 | } | |
67 | ||
68 | /** | |
69 | * new_inode_smack - allocate an inode security blob | |
70 | * @smack: a pointer to the Smack label to use in the blob | |
71 | * | |
72 | * Returns the new blob or NULL if there's no memory available | |
73 | */ | |
74 | struct inode_smack *new_inode_smack(char *smack) | |
75 | { | |
76 | struct inode_smack *isp; | |
77 | ||
78 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
79 | if (isp == NULL) | |
80 | return NULL; | |
81 | ||
82 | isp->smk_inode = smack; | |
83 | isp->smk_flags = 0; | |
84 | mutex_init(&isp->smk_lock); | |
85 | ||
86 | return isp; | |
87 | } | |
88 | ||
7898e1f8 CS |
89 | /** |
90 | * new_task_smack - allocate a task security blob | |
91 | * @smack: a pointer to the Smack label to use in the blob | |
92 | * | |
93 | * Returns the new blob or NULL if there's no memory available | |
94 | */ | |
95 | static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp) | |
96 | { | |
97 | struct task_smack *tsp; | |
98 | ||
99 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
100 | if (tsp == NULL) | |
101 | return NULL; | |
102 | ||
103 | tsp->smk_task = task; | |
104 | tsp->smk_forked = forked; | |
105 | INIT_LIST_HEAD(&tsp->smk_rules); | |
106 | mutex_init(&tsp->smk_rules_lock); | |
107 | ||
108 | return tsp; | |
109 | } | |
110 | ||
111 | /** | |
112 | * smk_copy_rules - copy a rule set | |
113 | * @nhead - new rules header pointer | |
114 | * @ohead - old rules header pointer | |
115 | * | |
116 | * Returns 0 on success, -ENOMEM on error | |
117 | */ | |
118 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
119 | gfp_t gfp) | |
120 | { | |
121 | struct smack_rule *nrp; | |
122 | struct smack_rule *orp; | |
123 | int rc = 0; | |
124 | ||
125 | INIT_LIST_HEAD(nhead); | |
126 | ||
127 | list_for_each_entry_rcu(orp, ohead, list) { | |
128 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
129 | if (nrp == NULL) { | |
130 | rc = -ENOMEM; | |
131 | break; | |
132 | } | |
133 | *nrp = *orp; | |
134 | list_add_rcu(&nrp->list, nhead); | |
135 | } | |
136 | return rc; | |
137 | } | |
138 | ||
e114e473 CS |
139 | /* |
140 | * LSM hooks. | |
141 | * We he, that is fun! | |
142 | */ | |
143 | ||
144 | /** | |
9e48858f | 145 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 146 | * @ctp: child task pointer |
251a2a95 | 147 | * @mode: ptrace attachment mode |
e114e473 CS |
148 | * |
149 | * Returns 0 if access is OK, an error code otherwise | |
150 | * | |
151 | * Do the capability checks, and require read and write. | |
152 | */ | |
9e48858f | 153 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
154 | { |
155 | int rc; | |
ecfcc53f | 156 | struct smk_audit_info ad; |
7898e1f8 | 157 | char *tsp; |
e114e473 | 158 | |
9e48858f | 159 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
160 | if (rc != 0) |
161 | return rc; | |
162 | ||
676dac4b | 163 | tsp = smk_of_task(task_security(ctp)); |
ecfcc53f EB |
164 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
165 | smk_ad_setfield_u_tsk(&ad, ctp); | |
166 | ||
7898e1f8 | 167 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
5cd9c58f DH |
168 | return rc; |
169 | } | |
170 | ||
171 | /** | |
172 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
173 | * @ptp: parent task pointer | |
174 | * | |
175 | * Returns 0 if access is OK, an error code otherwise | |
176 | * | |
177 | * Do the capability checks, and require read and write. | |
178 | */ | |
179 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
180 | { | |
181 | int rc; | |
ecfcc53f | 182 | struct smk_audit_info ad; |
7898e1f8 | 183 | char *tsp; |
5cd9c58f DH |
184 | |
185 | rc = cap_ptrace_traceme(ptp); | |
186 | if (rc != 0) | |
187 | return rc; | |
e114e473 | 188 | |
7898e1f8 | 189 | tsp = smk_of_task(task_security(ptp)); |
ecfcc53f EB |
190 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
191 | smk_ad_setfield_u_tsk(&ad, ptp); | |
192 | ||
7898e1f8 | 193 | rc = smk_curacc(tsp, MAY_READWRITE, &ad); |
e114e473 CS |
194 | return rc; |
195 | } | |
196 | ||
197 | /** | |
198 | * smack_syslog - Smack approval on syslog | |
199 | * @type: message type | |
200 | * | |
201 | * Require that the task has the floor label | |
202 | * | |
203 | * Returns 0 on success, error code otherwise. | |
204 | */ | |
12b3052c | 205 | static int smack_syslog(int typefrom_file) |
e114e473 | 206 | { |
12b3052c | 207 | int rc = 0; |
676dac4b | 208 | char *sp = smk_of_current(); |
e114e473 | 209 | |
e114e473 CS |
210 | if (capable(CAP_MAC_OVERRIDE)) |
211 | return 0; | |
212 | ||
213 | if (sp != smack_known_floor.smk_known) | |
214 | rc = -EACCES; | |
215 | ||
216 | return rc; | |
217 | } | |
218 | ||
219 | ||
220 | /* | |
221 | * Superblock Hooks. | |
222 | */ | |
223 | ||
224 | /** | |
225 | * smack_sb_alloc_security - allocate a superblock blob | |
226 | * @sb: the superblock getting the blob | |
227 | * | |
228 | * Returns 0 on success or -ENOMEM on error. | |
229 | */ | |
230 | static int smack_sb_alloc_security(struct super_block *sb) | |
231 | { | |
232 | struct superblock_smack *sbsp; | |
233 | ||
234 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
235 | ||
236 | if (sbsp == NULL) | |
237 | return -ENOMEM; | |
238 | ||
239 | sbsp->smk_root = smack_known_floor.smk_known; | |
240 | sbsp->smk_default = smack_known_floor.smk_known; | |
241 | sbsp->smk_floor = smack_known_floor.smk_known; | |
242 | sbsp->smk_hat = smack_known_hat.smk_known; | |
243 | sbsp->smk_initialized = 0; | |
244 | spin_lock_init(&sbsp->smk_sblock); | |
245 | ||
246 | sb->s_security = sbsp; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | /** | |
252 | * smack_sb_free_security - free a superblock blob | |
253 | * @sb: the superblock getting the blob | |
254 | * | |
255 | */ | |
256 | static void smack_sb_free_security(struct super_block *sb) | |
257 | { | |
258 | kfree(sb->s_security); | |
259 | sb->s_security = NULL; | |
260 | } | |
261 | ||
262 | /** | |
263 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 264 | * @orig: where to start |
251a2a95 | 265 | * @smackopts: mount options string |
e114e473 CS |
266 | * |
267 | * Returns 0 on success or -ENOMEM on error. | |
268 | * | |
269 | * Copy the Smack specific mount options out of the mount | |
270 | * options list. | |
271 | */ | |
e0007529 | 272 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
273 | { |
274 | char *cp, *commap, *otheropts, *dp; | |
275 | ||
e114e473 CS |
276 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
277 | if (otheropts == NULL) | |
278 | return -ENOMEM; | |
279 | ||
280 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
281 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
282 | dp = smackopts; | |
283 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
284 | dp = smackopts; | |
285 | else if (strstr(cp, SMK_FSHAT) == cp) | |
286 | dp = smackopts; | |
287 | else if (strstr(cp, SMK_FSROOT) == cp) | |
288 | dp = smackopts; | |
289 | else | |
290 | dp = otheropts; | |
291 | ||
292 | commap = strchr(cp, ','); | |
293 | if (commap != NULL) | |
294 | *commap = '\0'; | |
295 | ||
296 | if (*dp != '\0') | |
297 | strcat(dp, ","); | |
298 | strcat(dp, cp); | |
299 | } | |
300 | ||
301 | strcpy(orig, otheropts); | |
302 | free_page((unsigned long)otheropts); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | /** | |
308 | * smack_sb_kern_mount - Smack specific mount processing | |
309 | * @sb: the file system superblock | |
12204e24 | 310 | * @flags: the mount flags |
e114e473 CS |
311 | * @data: the smack mount options |
312 | * | |
313 | * Returns 0 on success, an error code on failure | |
314 | */ | |
12204e24 | 315 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
316 | { |
317 | struct dentry *root = sb->s_root; | |
318 | struct inode *inode = root->d_inode; | |
319 | struct superblock_smack *sp = sb->s_security; | |
320 | struct inode_smack *isp; | |
321 | char *op; | |
322 | char *commap; | |
323 | char *nsp; | |
324 | ||
325 | spin_lock(&sp->smk_sblock); | |
326 | if (sp->smk_initialized != 0) { | |
327 | spin_unlock(&sp->smk_sblock); | |
328 | return 0; | |
329 | } | |
330 | sp->smk_initialized = 1; | |
331 | spin_unlock(&sp->smk_sblock); | |
332 | ||
333 | for (op = data; op != NULL; op = commap) { | |
334 | commap = strchr(op, ','); | |
335 | if (commap != NULL) | |
336 | *commap++ = '\0'; | |
337 | ||
338 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
339 | op += strlen(SMK_FSHAT); | |
340 | nsp = smk_import(op, 0); | |
341 | if (nsp != NULL) | |
342 | sp->smk_hat = nsp; | |
343 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
344 | op += strlen(SMK_FSFLOOR); | |
345 | nsp = smk_import(op, 0); | |
346 | if (nsp != NULL) | |
347 | sp->smk_floor = nsp; | |
348 | } else if (strncmp(op, SMK_FSDEFAULT, | |
349 | strlen(SMK_FSDEFAULT)) == 0) { | |
350 | op += strlen(SMK_FSDEFAULT); | |
351 | nsp = smk_import(op, 0); | |
352 | if (nsp != NULL) | |
353 | sp->smk_default = nsp; | |
354 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
355 | op += strlen(SMK_FSROOT); | |
356 | nsp = smk_import(op, 0); | |
357 | if (nsp != NULL) | |
358 | sp->smk_root = nsp; | |
359 | } | |
360 | } | |
361 | ||
362 | /* | |
363 | * Initialize the root inode. | |
364 | */ | |
365 | isp = inode->i_security; | |
366 | if (isp == NULL) | |
367 | inode->i_security = new_inode_smack(sp->smk_root); | |
368 | else | |
369 | isp->smk_inode = sp->smk_root; | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | /** | |
375 | * smack_sb_statfs - Smack check on statfs | |
376 | * @dentry: identifies the file system in question | |
377 | * | |
378 | * Returns 0 if current can read the floor of the filesystem, | |
379 | * and error code otherwise | |
380 | */ | |
381 | static int smack_sb_statfs(struct dentry *dentry) | |
382 | { | |
383 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
384 | int rc; |
385 | struct smk_audit_info ad; | |
386 | ||
a269434d | 387 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 388 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 389 | |
ecfcc53f EB |
390 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
391 | return rc; | |
e114e473 CS |
392 | } |
393 | ||
394 | /** | |
395 | * smack_sb_mount - Smack check for mounting | |
396 | * @dev_name: unused | |
251a2a95 | 397 | * @path: mount point |
e114e473 CS |
398 | * @type: unused |
399 | * @flags: unused | |
400 | * @data: unused | |
401 | * | |
402 | * Returns 0 if current can write the floor of the filesystem | |
403 | * being mounted on, an error code otherwise. | |
404 | */ | |
b5266eb4 | 405 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
406 | char *type, unsigned long flags, void *data) |
407 | { | |
b5266eb4 | 408 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 409 | struct smk_audit_info ad; |
e114e473 | 410 | |
f48b7399 | 411 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f EB |
412 | smk_ad_setfield_u_fs_path(&ad, *path); |
413 | ||
414 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
415 | } |
416 | ||
417 | /** | |
418 | * smack_sb_umount - Smack check for unmounting | |
419 | * @mnt: file system to unmount | |
420 | * @flags: unused | |
421 | * | |
422 | * Returns 0 if current can write the floor of the filesystem | |
423 | * being unmounted, an error code otherwise. | |
424 | */ | |
425 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
426 | { | |
427 | struct superblock_smack *sbp; | |
ecfcc53f | 428 | struct smk_audit_info ad; |
a269434d | 429 | struct path path; |
e114e473 | 430 | |
a269434d EP |
431 | path.dentry = mnt->mnt_root; |
432 | path.mnt = mnt; | |
e114e473 | 433 | |
f48b7399 | 434 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 435 | smk_ad_setfield_u_fs_path(&ad, path); |
e114e473 | 436 | |
ecfcc53f EB |
437 | sbp = mnt->mnt_sb->s_security; |
438 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
439 | } |
440 | ||
676dac4b CS |
441 | /* |
442 | * BPRM hooks | |
443 | */ | |
444 | ||
ce8a4321 CS |
445 | /** |
446 | * smack_bprm_set_creds - set creds for exec | |
447 | * @bprm: the exec information | |
448 | * | |
449 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
450 | */ | |
676dac4b CS |
451 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
452 | { | |
84088ba2 JS |
453 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
454 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 455 | struct inode_smack *isp; |
676dac4b CS |
456 | int rc; |
457 | ||
458 | rc = cap_bprm_set_creds(bprm); | |
459 | if (rc != 0) | |
460 | return rc; | |
461 | ||
462 | if (bprm->cred_prepared) | |
463 | return 0; | |
464 | ||
84088ba2 JS |
465 | isp = inode->i_security; |
466 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
467 | return 0; |
468 | ||
84088ba2 JS |
469 | if (bprm->unsafe) |
470 | return -EPERM; | |
676dac4b | 471 | |
84088ba2 JS |
472 | bsp->smk_task = isp->smk_task; |
473 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 474 | |
84088ba2 JS |
475 | return 0; |
476 | } | |
676dac4b | 477 | |
84088ba2 JS |
478 | /** |
479 | * smack_bprm_committing_creds - Prepare to install the new credentials | |
480 | * from bprm. | |
481 | * | |
482 | * @bprm: binprm for exec | |
483 | */ | |
484 | static void smack_bprm_committing_creds(struct linux_binprm *bprm) | |
485 | { | |
486 | struct task_smack *bsp = bprm->cred->security; | |
676dac4b | 487 | |
84088ba2 JS |
488 | if (bsp->smk_task != bsp->smk_forked) |
489 | current->pdeath_signal = 0; | |
490 | } | |
491 | ||
492 | /** | |
493 | * smack_bprm_secureexec - Return the decision to use secureexec. | |
494 | * @bprm: binprm for exec | |
495 | * | |
496 | * Returns 0 on success. | |
497 | */ | |
498 | static int smack_bprm_secureexec(struct linux_binprm *bprm) | |
499 | { | |
500 | struct task_smack *tsp = current_security(); | |
501 | int ret = cap_bprm_secureexec(bprm); | |
502 | ||
503 | if (!ret && (tsp->smk_task != tsp->smk_forked)) | |
504 | ret = 1; | |
505 | ||
506 | return ret; | |
676dac4b CS |
507 | } |
508 | ||
e114e473 CS |
509 | /* |
510 | * Inode hooks | |
511 | */ | |
512 | ||
513 | /** | |
514 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 515 | * @inode: the inode in need of a blob |
e114e473 CS |
516 | * |
517 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
518 | */ | |
519 | static int smack_inode_alloc_security(struct inode *inode) | |
520 | { | |
676dac4b | 521 | inode->i_security = new_inode_smack(smk_of_current()); |
e114e473 CS |
522 | if (inode->i_security == NULL) |
523 | return -ENOMEM; | |
524 | return 0; | |
525 | } | |
526 | ||
527 | /** | |
528 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 529 | * @inode: the inode with a blob |
e114e473 CS |
530 | * |
531 | * Clears the blob pointer in inode | |
532 | */ | |
533 | static void smack_inode_free_security(struct inode *inode) | |
534 | { | |
535 | kfree(inode->i_security); | |
536 | inode->i_security = NULL; | |
537 | } | |
538 | ||
539 | /** | |
540 | * smack_inode_init_security - copy out the smack from an inode | |
541 | * @inode: the inode | |
542 | * @dir: unused | |
2a7dba39 | 543 | * @qstr: unused |
e114e473 CS |
544 | * @name: where to put the attribute name |
545 | * @value: where to put the attribute value | |
546 | * @len: where to put the length of the attribute | |
547 | * | |
548 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
549 | */ | |
550 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
2a7dba39 EP |
551 | const struct qstr *qstr, char **name, |
552 | void **value, size_t *len) | |
e114e473 | 553 | { |
272cd7a8 CS |
554 | struct smack_known *skp; |
555 | char *csp = smk_of_current(); | |
e114e473 | 556 | char *isp = smk_of_inode(inode); |
5c6d1125 | 557 | char *dsp = smk_of_inode(dir); |
7898e1f8 | 558 | int may; |
e114e473 CS |
559 | |
560 | if (name) { | |
561 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
562 | if (*name == NULL) | |
563 | return -ENOMEM; | |
564 | } | |
565 | ||
566 | if (value) { | |
272cd7a8 | 567 | skp = smk_find_entry(csp); |
7898e1f8 | 568 | rcu_read_lock(); |
272cd7a8 | 569 | may = smk_access_entry(csp, dsp, &skp->smk_rules); |
7898e1f8 | 570 | rcu_read_unlock(); |
5c6d1125 JS |
571 | |
572 | /* | |
573 | * If the access rule allows transmutation and | |
574 | * the directory requests transmutation then | |
575 | * by all means transmute. | |
576 | */ | |
7898e1f8 CS |
577 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
578 | smk_inode_transmutable(dir)) | |
5c6d1125 JS |
579 | isp = dsp; |
580 | ||
e114e473 CS |
581 | *value = kstrdup(isp, GFP_KERNEL); |
582 | if (*value == NULL) | |
583 | return -ENOMEM; | |
584 | } | |
585 | ||
586 | if (len) | |
587 | *len = strlen(isp) + 1; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | /** | |
593 | * smack_inode_link - Smack check on link | |
594 | * @old_dentry: the existing object | |
595 | * @dir: unused | |
596 | * @new_dentry: the new object | |
597 | * | |
598 | * Returns 0 if access is permitted, an error code otherwise | |
599 | */ | |
600 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
601 | struct dentry *new_dentry) | |
602 | { | |
e114e473 | 603 | char *isp; |
ecfcc53f EB |
604 | struct smk_audit_info ad; |
605 | int rc; | |
606 | ||
a269434d | 607 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 608 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
609 | |
610 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 611 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
612 | |
613 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
614 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
615 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
616 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
617 | } |
618 | ||
619 | return rc; | |
620 | } | |
621 | ||
622 | /** | |
623 | * smack_inode_unlink - Smack check on inode deletion | |
624 | * @dir: containing directory object | |
625 | * @dentry: file to unlink | |
626 | * | |
627 | * Returns 0 if current can write the containing directory | |
628 | * and the object, error code otherwise | |
629 | */ | |
630 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
631 | { | |
632 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 633 | struct smk_audit_info ad; |
e114e473 CS |
634 | int rc; |
635 | ||
a269434d | 636 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
637 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
638 | ||
e114e473 CS |
639 | /* |
640 | * You need write access to the thing you're unlinking | |
641 | */ | |
ecfcc53f EB |
642 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
643 | if (rc == 0) { | |
e114e473 CS |
644 | /* |
645 | * You also need write access to the containing directory | |
646 | */ | |
ecfcc53f EB |
647 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
648 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
649 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
650 | } | |
e114e473 CS |
651 | return rc; |
652 | } | |
653 | ||
654 | /** | |
655 | * smack_inode_rmdir - Smack check on directory deletion | |
656 | * @dir: containing directory object | |
657 | * @dentry: directory to unlink | |
658 | * | |
659 | * Returns 0 if current can write the containing directory | |
660 | * and the directory, error code otherwise | |
661 | */ | |
662 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
663 | { | |
ecfcc53f | 664 | struct smk_audit_info ad; |
e114e473 CS |
665 | int rc; |
666 | ||
a269434d | 667 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
668 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
669 | ||
e114e473 CS |
670 | /* |
671 | * You need write access to the thing you're removing | |
672 | */ | |
ecfcc53f EB |
673 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
674 | if (rc == 0) { | |
e114e473 CS |
675 | /* |
676 | * You also need write access to the containing directory | |
677 | */ | |
ecfcc53f EB |
678 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
679 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
680 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
681 | } | |
e114e473 CS |
682 | |
683 | return rc; | |
684 | } | |
685 | ||
686 | /** | |
687 | * smack_inode_rename - Smack check on rename | |
688 | * @old_inode: the old directory | |
689 | * @old_dentry: unused | |
690 | * @new_inode: the new directory | |
691 | * @new_dentry: unused | |
692 | * | |
693 | * Read and write access is required on both the old and | |
694 | * new directories. | |
695 | * | |
696 | * Returns 0 if access is permitted, an error code otherwise | |
697 | */ | |
698 | static int smack_inode_rename(struct inode *old_inode, | |
699 | struct dentry *old_dentry, | |
700 | struct inode *new_inode, | |
701 | struct dentry *new_dentry) | |
702 | { | |
703 | int rc; | |
704 | char *isp; | |
ecfcc53f EB |
705 | struct smk_audit_info ad; |
706 | ||
a269434d | 707 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 708 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 CS |
709 | |
710 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 711 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
712 | |
713 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
714 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
715 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
716 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 717 | } |
e114e473 CS |
718 | return rc; |
719 | } | |
720 | ||
721 | /** | |
722 | * smack_inode_permission - Smack version of permission() | |
723 | * @inode: the inode in question | |
724 | * @mask: the access requested | |
e114e473 CS |
725 | * |
726 | * This is the important Smack hook. | |
727 | * | |
728 | * Returns 0 if access is permitted, -EACCES otherwise | |
729 | */ | |
e74f71eb | 730 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 731 | { |
ecfcc53f | 732 | struct smk_audit_info ad; |
e74f71eb | 733 | int no_block = mask & MAY_NOT_BLOCK; |
d09ca739 EP |
734 | |
735 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
736 | /* |
737 | * No permission to check. Existence test. Yup, it's there. | |
738 | */ | |
739 | if (mask == 0) | |
740 | return 0; | |
8c9e80ed AK |
741 | |
742 | /* May be droppable after audit */ | |
e74f71eb | 743 | if (no_block) |
8c9e80ed | 744 | return -ECHILD; |
f48b7399 | 745 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
746 | smk_ad_setfield_u_fs_inode(&ad, inode); |
747 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
748 | } |
749 | ||
750 | /** | |
751 | * smack_inode_setattr - Smack check for setting attributes | |
752 | * @dentry: the object | |
753 | * @iattr: for the force flag | |
754 | * | |
755 | * Returns 0 if access is permitted, an error code otherwise | |
756 | */ | |
757 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
758 | { | |
ecfcc53f | 759 | struct smk_audit_info ad; |
e114e473 CS |
760 | /* |
761 | * Need to allow for clearing the setuid bit. | |
762 | */ | |
763 | if (iattr->ia_valid & ATTR_FORCE) | |
764 | return 0; | |
a269434d | 765 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 766 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 767 | |
ecfcc53f | 768 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
769 | } |
770 | ||
771 | /** | |
772 | * smack_inode_getattr - Smack check for getting attributes | |
773 | * @mnt: unused | |
774 | * @dentry: the object | |
775 | * | |
776 | * Returns 0 if access is permitted, an error code otherwise | |
777 | */ | |
778 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
779 | { | |
ecfcc53f | 780 | struct smk_audit_info ad; |
a269434d | 781 | struct path path; |
ecfcc53f | 782 | |
a269434d EP |
783 | path.dentry = dentry; |
784 | path.mnt = mnt; | |
ecfcc53f | 785 | |
f48b7399 | 786 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
a269434d | 787 | smk_ad_setfield_u_fs_path(&ad, path); |
ecfcc53f | 788 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); |
e114e473 CS |
789 | } |
790 | ||
791 | /** | |
792 | * smack_inode_setxattr - Smack check for setting xattrs | |
793 | * @dentry: the object | |
794 | * @name: name of the attribute | |
795 | * @value: unused | |
796 | * @size: unused | |
797 | * @flags: unused | |
798 | * | |
799 | * This protects the Smack attribute explicitly. | |
800 | * | |
801 | * Returns 0 if access is permitted, an error code otherwise | |
802 | */ | |
8f0cfa52 DH |
803 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
804 | const void *value, size_t size, int flags) | |
e114e473 | 805 | { |
ecfcc53f | 806 | struct smk_audit_info ad; |
bcdca225 | 807 | int rc = 0; |
e114e473 | 808 | |
bcdca225 CS |
809 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
810 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 811 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
7898e1f8 CS |
812 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
813 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
bcdca225 CS |
814 | if (!capable(CAP_MAC_ADMIN)) |
815 | rc = -EPERM; | |
defc433b EB |
816 | /* |
817 | * check label validity here so import wont fail on | |
818 | * post_setxattr | |
819 | */ | |
820 | if (size == 0 || size >= SMK_LABELLEN || | |
821 | smk_import(value, size) == NULL) | |
4303154e | 822 | rc = -EINVAL; |
5c6d1125 JS |
823 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
824 | if (!capable(CAP_MAC_ADMIN)) | |
825 | rc = -EPERM; | |
826 | if (size != TRANS_TRUE_SIZE || | |
827 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
828 | rc = -EINVAL; | |
bcdca225 CS |
829 | } else |
830 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
831 | ||
a269434d | 832 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
833 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
834 | ||
bcdca225 | 835 | if (rc == 0) |
ecfcc53f | 836 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
837 | |
838 | return rc; | |
e114e473 CS |
839 | } |
840 | ||
841 | /** | |
842 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
843 | * @dentry: object | |
844 | * @name: attribute name | |
845 | * @value: attribute value | |
846 | * @size: attribute size | |
847 | * @flags: unused | |
848 | * | |
849 | * Set the pointer in the inode blob to the entry found | |
850 | * in the master label list. | |
851 | */ | |
8f0cfa52 DH |
852 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
853 | const void *value, size_t size, int flags) | |
e114e473 | 854 | { |
e114e473 | 855 | char *nsp; |
5c6d1125 | 856 | struct inode_smack *isp = dentry->d_inode->i_security; |
676dac4b CS |
857 | |
858 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { | |
5c6d1125 | 859 | nsp = smk_import(value, size); |
676dac4b CS |
860 | if (nsp != NULL) |
861 | isp->smk_inode = nsp; | |
862 | else | |
863 | isp->smk_inode = smack_known_invalid.smk_known; | |
5c6d1125 JS |
864 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
865 | nsp = smk_import(value, size); | |
676dac4b CS |
866 | if (nsp != NULL) |
867 | isp->smk_task = nsp; | |
868 | else | |
869 | isp->smk_task = smack_known_invalid.smk_known; | |
7898e1f8 CS |
870 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
871 | nsp = smk_import(value, size); | |
872 | if (nsp != NULL) | |
873 | isp->smk_mmap = nsp; | |
874 | else | |
875 | isp->smk_mmap = smack_known_invalid.smk_known; | |
5c6d1125 JS |
876 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
877 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
e114e473 CS |
878 | |
879 | return; | |
880 | } | |
881 | ||
ce8a4321 | 882 | /** |
e114e473 CS |
883 | * smack_inode_getxattr - Smack check on getxattr |
884 | * @dentry: the object | |
885 | * @name: unused | |
886 | * | |
887 | * Returns 0 if access is permitted, an error code otherwise | |
888 | */ | |
8f0cfa52 | 889 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 890 | { |
ecfcc53f EB |
891 | struct smk_audit_info ad; |
892 | ||
a269434d | 893 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
894 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
895 | ||
896 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
897 | } |
898 | ||
ce8a4321 | 899 | /** |
e114e473 CS |
900 | * smack_inode_removexattr - Smack check on removexattr |
901 | * @dentry: the object | |
902 | * @name: name of the attribute | |
903 | * | |
904 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
905 | * | |
906 | * Returns 0 if access is permitted, an error code otherwise | |
907 | */ | |
8f0cfa52 | 908 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 909 | { |
676dac4b | 910 | struct inode_smack *isp; |
ecfcc53f | 911 | struct smk_audit_info ad; |
bcdca225 | 912 | int rc = 0; |
e114e473 | 913 | |
bcdca225 CS |
914 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
915 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 916 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 917 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 CS |
918 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
919 | strcmp(name, XATTR_NAME_SMACKMMAP)) { | |
bcdca225 CS |
920 | if (!capable(CAP_MAC_ADMIN)) |
921 | rc = -EPERM; | |
922 | } else | |
923 | rc = cap_inode_removexattr(dentry, name); | |
924 | ||
a269434d | 925 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 926 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 927 | if (rc == 0) |
ecfcc53f | 928 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 | 929 | |
676dac4b CS |
930 | if (rc == 0) { |
931 | isp = dentry->d_inode->i_security; | |
932 | isp->smk_task = NULL; | |
7898e1f8 | 933 | isp->smk_mmap = NULL; |
676dac4b CS |
934 | } |
935 | ||
bcdca225 | 936 | return rc; |
e114e473 CS |
937 | } |
938 | ||
939 | /** | |
940 | * smack_inode_getsecurity - get smack xattrs | |
941 | * @inode: the object | |
942 | * @name: attribute name | |
943 | * @buffer: where to put the result | |
251a2a95 | 944 | * @alloc: unused |
e114e473 CS |
945 | * |
946 | * Returns the size of the attribute or an error code | |
947 | */ | |
948 | static int smack_inode_getsecurity(const struct inode *inode, | |
949 | const char *name, void **buffer, | |
950 | bool alloc) | |
951 | { | |
952 | struct socket_smack *ssp; | |
953 | struct socket *sock; | |
954 | struct super_block *sbp; | |
955 | struct inode *ip = (struct inode *)inode; | |
956 | char *isp; | |
957 | int ilen; | |
958 | int rc = 0; | |
959 | ||
960 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
961 | isp = smk_of_inode(inode); | |
962 | ilen = strlen(isp) + 1; | |
963 | *buffer = isp; | |
964 | return ilen; | |
965 | } | |
966 | ||
967 | /* | |
968 | * The rest of the Smack xattrs are only on sockets. | |
969 | */ | |
970 | sbp = ip->i_sb; | |
971 | if (sbp->s_magic != SOCKFS_MAGIC) | |
972 | return -EOPNOTSUPP; | |
973 | ||
974 | sock = SOCKET_I(ip); | |
2e1d146a | 975 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
976 | return -EOPNOTSUPP; |
977 | ||
978 | ssp = sock->sk->sk_security; | |
979 | ||
980 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
981 | isp = ssp->smk_in; | |
982 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
983 | isp = ssp->smk_out; | |
984 | else | |
985 | return -EOPNOTSUPP; | |
986 | ||
987 | ilen = strlen(isp) + 1; | |
988 | if (rc == 0) { | |
989 | *buffer = isp; | |
990 | rc = ilen; | |
991 | } | |
992 | ||
993 | return rc; | |
994 | } | |
995 | ||
996 | ||
997 | /** | |
998 | * smack_inode_listsecurity - list the Smack attributes | |
999 | * @inode: the object | |
1000 | * @buffer: where they go | |
1001 | * @buffer_size: size of buffer | |
1002 | * | |
1003 | * Returns 0 on success, -EINVAL otherwise | |
1004 | */ | |
1005 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1006 | size_t buffer_size) | |
1007 | { | |
1008 | int len = strlen(XATTR_NAME_SMACK); | |
1009 | ||
1010 | if (buffer != NULL && len <= buffer_size) { | |
1011 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
1012 | return len; | |
1013 | } | |
1014 | return -EINVAL; | |
1015 | } | |
1016 | ||
d20bdda6 AD |
1017 | /** |
1018 | * smack_inode_getsecid - Extract inode's security id | |
1019 | * @inode: inode to extract the info from | |
1020 | * @secid: where result will be saved | |
1021 | */ | |
1022 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
1023 | { | |
1024 | struct inode_smack *isp = inode->i_security; | |
1025 | ||
1026 | *secid = smack_to_secid(isp->smk_inode); | |
1027 | } | |
1028 | ||
e114e473 CS |
1029 | /* |
1030 | * File Hooks | |
1031 | */ | |
1032 | ||
1033 | /** | |
1034 | * smack_file_permission - Smack check on file operations | |
1035 | * @file: unused | |
1036 | * @mask: unused | |
1037 | * | |
1038 | * Returns 0 | |
1039 | * | |
1040 | * Should access checks be done on each read or write? | |
1041 | * UNICOS and SELinux say yes. | |
1042 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1043 | * | |
1044 | * I'll say no for now. Smack does not do the frequent | |
1045 | * label changing that SELinux does. | |
1046 | */ | |
1047 | static int smack_file_permission(struct file *file, int mask) | |
1048 | { | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | /** | |
1053 | * smack_file_alloc_security - assign a file security blob | |
1054 | * @file: the object | |
1055 | * | |
1056 | * The security blob for a file is a pointer to the master | |
1057 | * label list, so no allocation is done. | |
1058 | * | |
1059 | * Returns 0 | |
1060 | */ | |
1061 | static int smack_file_alloc_security(struct file *file) | |
1062 | { | |
676dac4b | 1063 | file->f_security = smk_of_current(); |
e114e473 CS |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | /** | |
1068 | * smack_file_free_security - clear a file security blob | |
1069 | * @file: the object | |
1070 | * | |
1071 | * The security blob for a file is a pointer to the master | |
1072 | * label list, so no memory is freed. | |
1073 | */ | |
1074 | static void smack_file_free_security(struct file *file) | |
1075 | { | |
1076 | file->f_security = NULL; | |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * smack_file_ioctl - Smack check on ioctls | |
1081 | * @file: the object | |
1082 | * @cmd: what to do | |
1083 | * @arg: unused | |
1084 | * | |
1085 | * Relies heavily on the correct use of the ioctl command conventions. | |
1086 | * | |
1087 | * Returns 0 if allowed, error code otherwise | |
1088 | */ | |
1089 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1090 | unsigned long arg) | |
1091 | { | |
1092 | int rc = 0; | |
ecfcc53f EB |
1093 | struct smk_audit_info ad; |
1094 | ||
f48b7399 | 1095 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1096 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 CS |
1097 | |
1098 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 1099 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1100 | |
1101 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 1102 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
1103 | |
1104 | return rc; | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * smack_file_lock - Smack check on file locking | |
1109 | * @file: the object | |
251a2a95 | 1110 | * @cmd: unused |
e114e473 CS |
1111 | * |
1112 | * Returns 0 if current has write access, error code otherwise | |
1113 | */ | |
1114 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1115 | { | |
ecfcc53f EB |
1116 | struct smk_audit_info ad; |
1117 | ||
92f42509 EP |
1118 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1119 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1120 | return smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1121 | } |
1122 | ||
1123 | /** | |
1124 | * smack_file_fcntl - Smack check on fcntl | |
1125 | * @file: the object | |
1126 | * @cmd: what action to check | |
1127 | * @arg: unused | |
1128 | * | |
531f1d45 CS |
1129 | * Generally these operations are harmless. |
1130 | * File locking operations present an obvious mechanism | |
1131 | * for passing information, so they require write access. | |
1132 | * | |
e114e473 CS |
1133 | * Returns 0 if current has access, error code otherwise |
1134 | */ | |
1135 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1136 | unsigned long arg) | |
1137 | { | |
ecfcc53f | 1138 | struct smk_audit_info ad; |
531f1d45 | 1139 | int rc = 0; |
e114e473 | 1140 | |
ecfcc53f | 1141 | |
e114e473 | 1142 | switch (cmd) { |
e114e473 | 1143 | case F_GETLK: |
e114e473 CS |
1144 | case F_SETLK: |
1145 | case F_SETLKW: | |
1146 | case F_SETOWN: | |
1147 | case F_SETSIG: | |
531f1d45 CS |
1148 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1149 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
ecfcc53f | 1150 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
1151 | break; |
1152 | default: | |
531f1d45 | 1153 | break; |
e114e473 CS |
1154 | } |
1155 | ||
1156 | return rc; | |
1157 | } | |
1158 | ||
7898e1f8 CS |
1159 | /** |
1160 | * smack_file_mmap : | |
1161 | * Check permissions for a mmap operation. The @file may be NULL, e.g. | |
1162 | * if mapping anonymous memory. | |
1163 | * @file contains the file structure for file to map (may be NULL). | |
1164 | * @reqprot contains the protection requested by the application. | |
1165 | * @prot contains the protection that will be applied by the kernel. | |
1166 | * @flags contains the operational flags. | |
1167 | * Return 0 if permission is granted. | |
1168 | */ | |
1169 | static int smack_file_mmap(struct file *file, | |
1170 | unsigned long reqprot, unsigned long prot, | |
1171 | unsigned long flags, unsigned long addr, | |
1172 | unsigned long addr_only) | |
1173 | { | |
272cd7a8 | 1174 | struct smack_known *skp; |
7898e1f8 CS |
1175 | struct smack_rule *srp; |
1176 | struct task_smack *tsp; | |
1177 | char *sp; | |
1178 | char *msmack; | |
0e0a070d | 1179 | char *osmack; |
7898e1f8 CS |
1180 | struct inode_smack *isp; |
1181 | struct dentry *dp; | |
0e0a070d CS |
1182 | int may; |
1183 | int mmay; | |
1184 | int tmay; | |
7898e1f8 CS |
1185 | int rc; |
1186 | ||
1187 | /* do DAC check on address space usage */ | |
1188 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
1189 | if (rc || addr_only) | |
1190 | return rc; | |
1191 | ||
1192 | if (file == NULL || file->f_dentry == NULL) | |
1193 | return 0; | |
1194 | ||
1195 | dp = file->f_dentry; | |
1196 | ||
1197 | if (dp->d_inode == NULL) | |
1198 | return 0; | |
1199 | ||
1200 | isp = dp->d_inode->i_security; | |
1201 | if (isp->smk_mmap == NULL) | |
1202 | return 0; | |
1203 | msmack = isp->smk_mmap; | |
1204 | ||
1205 | tsp = current_security(); | |
1206 | sp = smk_of_current(); | |
272cd7a8 | 1207 | skp = smk_find_entry(sp); |
7898e1f8 CS |
1208 | rc = 0; |
1209 | ||
1210 | rcu_read_lock(); | |
1211 | /* | |
1212 | * For each Smack rule associated with the subject | |
1213 | * label verify that the SMACK64MMAP also has access | |
1214 | * to that rule's object label. | |
7898e1f8 | 1215 | */ |
272cd7a8 | 1216 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
0e0a070d | 1217 | osmack = srp->smk_object; |
7898e1f8 CS |
1218 | /* |
1219 | * Matching labels always allows access. | |
1220 | */ | |
0e0a070d | 1221 | if (msmack == osmack) |
7898e1f8 | 1222 | continue; |
0e0a070d CS |
1223 | /* |
1224 | * If there is a matching local rule take | |
1225 | * that into account as well. | |
1226 | */ | |
1227 | may = smk_access_entry(srp->smk_subject, osmack, | |
1228 | &tsp->smk_rules); | |
1229 | if (may == -ENOENT) | |
1230 | may = srp->smk_access; | |
1231 | else | |
1232 | may &= srp->smk_access; | |
1233 | /* | |
1234 | * If may is zero the SMACK64MMAP subject can't | |
1235 | * possibly have less access. | |
1236 | */ | |
1237 | if (may == 0) | |
1238 | continue; | |
1239 | ||
1240 | /* | |
1241 | * Fetch the global list entry. | |
1242 | * If there isn't one a SMACK64MMAP subject | |
1243 | * can't have as much access as current. | |
1244 | */ | |
272cd7a8 CS |
1245 | skp = smk_find_entry(msmack); |
1246 | mmay = smk_access_entry(msmack, osmack, &skp->smk_rules); | |
0e0a070d CS |
1247 | if (mmay == -ENOENT) { |
1248 | rc = -EACCES; | |
1249 | break; | |
1250 | } | |
1251 | /* | |
1252 | * If there is a local entry it modifies the | |
1253 | * potential access, too. | |
1254 | */ | |
1255 | tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules); | |
1256 | if (tmay != -ENOENT) | |
1257 | mmay &= tmay; | |
7898e1f8 | 1258 | |
0e0a070d CS |
1259 | /* |
1260 | * If there is any access available to current that is | |
1261 | * not available to a SMACK64MMAP subject | |
1262 | * deny access. | |
1263 | */ | |
75a25637 | 1264 | if ((may | mmay) != mmay) { |
0e0a070d | 1265 | rc = -EACCES; |
7898e1f8 | 1266 | break; |
0e0a070d | 1267 | } |
7898e1f8 CS |
1268 | } |
1269 | ||
1270 | rcu_read_unlock(); | |
1271 | ||
1272 | return rc; | |
1273 | } | |
1274 | ||
e114e473 CS |
1275 | /** |
1276 | * smack_file_set_fowner - set the file security blob value | |
1277 | * @file: object in question | |
1278 | * | |
1279 | * Returns 0 | |
1280 | * Further research may be required on this one. | |
1281 | */ | |
1282 | static int smack_file_set_fowner(struct file *file) | |
1283 | { | |
676dac4b | 1284 | file->f_security = smk_of_current(); |
e114e473 CS |
1285 | return 0; |
1286 | } | |
1287 | ||
1288 | /** | |
1289 | * smack_file_send_sigiotask - Smack on sigio | |
1290 | * @tsk: The target task | |
1291 | * @fown: the object the signal come from | |
1292 | * @signum: unused | |
1293 | * | |
1294 | * Allow a privileged task to get signals even if it shouldn't | |
1295 | * | |
1296 | * Returns 0 if a subject with the object's smack could | |
1297 | * write to the task, an error code otherwise. | |
1298 | */ | |
1299 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1300 | struct fown_struct *fown, int signum) | |
1301 | { | |
1302 | struct file *file; | |
1303 | int rc; | |
676dac4b | 1304 | char *tsp = smk_of_task(tsk->cred->security); |
ecfcc53f | 1305 | struct smk_audit_info ad; |
e114e473 CS |
1306 | |
1307 | /* | |
1308 | * struct fown_struct is never outside the context of a struct file | |
1309 | */ | |
1310 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1311 | |
ecfcc53f EB |
1312 | /* we don't log here as rc can be overriden */ |
1313 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1314 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1315 | rc = 0; |
1316 | ||
1317 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1318 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1319 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1320 | return rc; |
1321 | } | |
1322 | ||
1323 | /** | |
1324 | * smack_file_receive - Smack file receive check | |
1325 | * @file: the object | |
1326 | * | |
1327 | * Returns 0 if current has access, error code otherwise | |
1328 | */ | |
1329 | static int smack_file_receive(struct file *file) | |
1330 | { | |
1331 | int may = 0; | |
ecfcc53f | 1332 | struct smk_audit_info ad; |
e114e473 | 1333 | |
ecfcc53f EB |
1334 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1335 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1336 | /* |
1337 | * This code relies on bitmasks. | |
1338 | */ | |
1339 | if (file->f_mode & FMODE_READ) | |
1340 | may = MAY_READ; | |
1341 | if (file->f_mode & FMODE_WRITE) | |
1342 | may |= MAY_WRITE; | |
1343 | ||
ecfcc53f | 1344 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1345 | } |
1346 | ||
531f1d45 CS |
1347 | /** |
1348 | * smack_dentry_open - Smack dentry open processing | |
1349 | * @file: the object | |
1350 | * @cred: unused | |
1351 | * | |
1352 | * Set the security blob in the file structure. | |
1353 | * | |
1354 | * Returns 0 | |
1355 | */ | |
1356 | static int smack_dentry_open(struct file *file, const struct cred *cred) | |
1357 | { | |
1358 | struct inode_smack *isp = file->f_path.dentry->d_inode->i_security; | |
1359 | ||
1360 | file->f_security = isp->smk_inode; | |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
e114e473 CS |
1365 | /* |
1366 | * Task hooks | |
1367 | */ | |
1368 | ||
ee18d64c DH |
1369 | /** |
1370 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1371 | * @new: the new credentials | |
1372 | * @gfp: the atomicity of any memory allocations | |
1373 | * | |
1374 | * Prepare a blank set of credentials for modification. This must allocate all | |
1375 | * the memory the LSM module might require such that cred_transfer() can | |
1376 | * complete without error. | |
1377 | */ | |
1378 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1379 | { | |
7898e1f8 CS |
1380 | struct task_smack *tsp; |
1381 | ||
1382 | tsp = new_task_smack(NULL, NULL, gfp); | |
1383 | if (tsp == NULL) | |
676dac4b | 1384 | return -ENOMEM; |
7898e1f8 CS |
1385 | |
1386 | cred->security = tsp; | |
1387 | ||
ee18d64c DH |
1388 | return 0; |
1389 | } | |
1390 | ||
1391 | ||
e114e473 | 1392 | /** |
f1752eec DH |
1393 | * smack_cred_free - "free" task-level security credentials |
1394 | * @cred: the credentials in question | |
e114e473 | 1395 | * |
e114e473 | 1396 | */ |
f1752eec | 1397 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1398 | { |
7898e1f8 CS |
1399 | struct task_smack *tsp = cred->security; |
1400 | struct smack_rule *rp; | |
1401 | struct list_head *l; | |
1402 | struct list_head *n; | |
1403 | ||
1404 | if (tsp == NULL) | |
1405 | return; | |
1406 | cred->security = NULL; | |
1407 | ||
1408 | list_for_each_safe(l, n, &tsp->smk_rules) { | |
1409 | rp = list_entry(l, struct smack_rule, list); | |
1410 | list_del(&rp->list); | |
1411 | kfree(rp); | |
1412 | } | |
1413 | kfree(tsp); | |
e114e473 CS |
1414 | } |
1415 | ||
d84f4f99 DH |
1416 | /** |
1417 | * smack_cred_prepare - prepare new set of credentials for modification | |
1418 | * @new: the new credentials | |
1419 | * @old: the original credentials | |
1420 | * @gfp: the atomicity of any memory allocations | |
1421 | * | |
1422 | * Prepare a new set of credentials for modification. | |
1423 | */ | |
1424 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1425 | gfp_t gfp) | |
1426 | { | |
676dac4b CS |
1427 | struct task_smack *old_tsp = old->security; |
1428 | struct task_smack *new_tsp; | |
7898e1f8 | 1429 | int rc; |
676dac4b | 1430 | |
7898e1f8 | 1431 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
1432 | if (new_tsp == NULL) |
1433 | return -ENOMEM; | |
1434 | ||
7898e1f8 CS |
1435 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
1436 | if (rc != 0) | |
1437 | return rc; | |
1438 | ||
676dac4b | 1439 | new->security = new_tsp; |
d84f4f99 DH |
1440 | return 0; |
1441 | } | |
1442 | ||
ee18d64c DH |
1443 | /** |
1444 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1445 | * @new: the new credentials | |
1446 | * @old: the original credentials | |
1447 | * | |
1448 | * Fill in a set of blank credentials from another set of credentials. | |
1449 | */ | |
1450 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1451 | { | |
676dac4b CS |
1452 | struct task_smack *old_tsp = old->security; |
1453 | struct task_smack *new_tsp = new->security; | |
1454 | ||
1455 | new_tsp->smk_task = old_tsp->smk_task; | |
1456 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
1457 | mutex_init(&new_tsp->smk_rules_lock); |
1458 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
1459 | ||
1460 | ||
1461 | /* cbs copy rule list */ | |
ee18d64c DH |
1462 | } |
1463 | ||
3a3b7ce9 DH |
1464 | /** |
1465 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1466 | * @new: points to the set of credentials to be modified. |
1467 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1468 | * |
1469 | * Set the security data for a kernel service. | |
1470 | */ | |
1471 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1472 | { | |
676dac4b | 1473 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 DH |
1474 | char *smack = smack_from_secid(secid); |
1475 | ||
1476 | if (smack == NULL) | |
1477 | return -EINVAL; | |
1478 | ||
676dac4b | 1479 | new_tsp->smk_task = smack; |
3a3b7ce9 DH |
1480 | return 0; |
1481 | } | |
1482 | ||
1483 | /** | |
1484 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1485 | * @new: points to the set of credentials to be modified |
1486 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1487 | * |
1488 | * Set the file creation context in a set of credentials to the same | |
1489 | * as the objective context of the specified inode | |
1490 | */ | |
1491 | static int smack_kernel_create_files_as(struct cred *new, | |
1492 | struct inode *inode) | |
1493 | { | |
1494 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1495 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 1496 | |
676dac4b CS |
1497 | tsp->smk_forked = isp->smk_inode; |
1498 | tsp->smk_task = isp->smk_inode; | |
3a3b7ce9 DH |
1499 | return 0; |
1500 | } | |
1501 | ||
ecfcc53f EB |
1502 | /** |
1503 | * smk_curacc_on_task - helper to log task related access | |
1504 | * @p: the task object | |
531f1d45 CS |
1505 | * @access: the access requested |
1506 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
1507 | * |
1508 | * Return 0 if access is permitted | |
1509 | */ | |
531f1d45 CS |
1510 | static int smk_curacc_on_task(struct task_struct *p, int access, |
1511 | const char *caller) | |
ecfcc53f EB |
1512 | { |
1513 | struct smk_audit_info ad; | |
1514 | ||
531f1d45 | 1515 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 1516 | smk_ad_setfield_u_tsk(&ad, p); |
676dac4b | 1517 | return smk_curacc(smk_of_task(task_security(p)), access, &ad); |
ecfcc53f EB |
1518 | } |
1519 | ||
e114e473 CS |
1520 | /** |
1521 | * smack_task_setpgid - Smack check on setting pgid | |
1522 | * @p: the task object | |
1523 | * @pgid: unused | |
1524 | * | |
1525 | * Return 0 if write access is permitted | |
1526 | */ | |
1527 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1528 | { | |
531f1d45 | 1529 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1530 | } |
1531 | ||
1532 | /** | |
1533 | * smack_task_getpgid - Smack access check for getpgid | |
1534 | * @p: the object task | |
1535 | * | |
1536 | * Returns 0 if current can read the object task, error code otherwise | |
1537 | */ | |
1538 | static int smack_task_getpgid(struct task_struct *p) | |
1539 | { | |
531f1d45 | 1540 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1541 | } |
1542 | ||
1543 | /** | |
1544 | * smack_task_getsid - Smack access check for getsid | |
1545 | * @p: the object task | |
1546 | * | |
1547 | * Returns 0 if current can read the object task, error code otherwise | |
1548 | */ | |
1549 | static int smack_task_getsid(struct task_struct *p) | |
1550 | { | |
531f1d45 | 1551 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1552 | } |
1553 | ||
1554 | /** | |
1555 | * smack_task_getsecid - get the secid of the task | |
1556 | * @p: the object task | |
1557 | * @secid: where to put the result | |
1558 | * | |
1559 | * Sets the secid to contain a u32 version of the smack label. | |
1560 | */ | |
1561 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1562 | { | |
676dac4b | 1563 | *secid = smack_to_secid(smk_of_task(task_security(p))); |
e114e473 CS |
1564 | } |
1565 | ||
1566 | /** | |
1567 | * smack_task_setnice - Smack check on setting nice | |
1568 | * @p: the task object | |
1569 | * @nice: unused | |
1570 | * | |
1571 | * Return 0 if write access is permitted | |
1572 | */ | |
1573 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1574 | { | |
bcdca225 CS |
1575 | int rc; |
1576 | ||
1577 | rc = cap_task_setnice(p, nice); | |
1578 | if (rc == 0) | |
531f1d45 | 1579 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1580 | return rc; |
e114e473 CS |
1581 | } |
1582 | ||
1583 | /** | |
1584 | * smack_task_setioprio - Smack check on setting ioprio | |
1585 | * @p: the task object | |
1586 | * @ioprio: unused | |
1587 | * | |
1588 | * Return 0 if write access is permitted | |
1589 | */ | |
1590 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1591 | { | |
bcdca225 CS |
1592 | int rc; |
1593 | ||
1594 | rc = cap_task_setioprio(p, ioprio); | |
1595 | if (rc == 0) | |
531f1d45 | 1596 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1597 | return rc; |
e114e473 CS |
1598 | } |
1599 | ||
1600 | /** | |
1601 | * smack_task_getioprio - Smack check on reading ioprio | |
1602 | * @p: the task object | |
1603 | * | |
1604 | * Return 0 if read access is permitted | |
1605 | */ | |
1606 | static int smack_task_getioprio(struct task_struct *p) | |
1607 | { | |
531f1d45 | 1608 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1609 | } |
1610 | ||
1611 | /** | |
1612 | * smack_task_setscheduler - Smack check on setting scheduler | |
1613 | * @p: the task object | |
1614 | * @policy: unused | |
1615 | * @lp: unused | |
1616 | * | |
1617 | * Return 0 if read access is permitted | |
1618 | */ | |
b0ae1981 | 1619 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 1620 | { |
bcdca225 CS |
1621 | int rc; |
1622 | ||
b0ae1981 | 1623 | rc = cap_task_setscheduler(p); |
bcdca225 | 1624 | if (rc == 0) |
531f1d45 | 1625 | rc = smk_curacc_on_task(p, MAY_WRITE, __func__); |
bcdca225 | 1626 | return rc; |
e114e473 CS |
1627 | } |
1628 | ||
1629 | /** | |
1630 | * smack_task_getscheduler - Smack check on reading scheduler | |
1631 | * @p: the task object | |
1632 | * | |
1633 | * Return 0 if read access is permitted | |
1634 | */ | |
1635 | static int smack_task_getscheduler(struct task_struct *p) | |
1636 | { | |
531f1d45 | 1637 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
1638 | } |
1639 | ||
1640 | /** | |
1641 | * smack_task_movememory - Smack check on moving memory | |
1642 | * @p: the task object | |
1643 | * | |
1644 | * Return 0 if write access is permitted | |
1645 | */ | |
1646 | static int smack_task_movememory(struct task_struct *p) | |
1647 | { | |
531f1d45 | 1648 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
1649 | } |
1650 | ||
1651 | /** | |
1652 | * smack_task_kill - Smack check on signal delivery | |
1653 | * @p: the task object | |
1654 | * @info: unused | |
1655 | * @sig: unused | |
1656 | * @secid: identifies the smack to use in lieu of current's | |
1657 | * | |
1658 | * Return 0 if write access is permitted | |
1659 | * | |
1660 | * The secid behavior is an artifact of an SELinux hack | |
1661 | * in the USB code. Someday it may go away. | |
1662 | */ | |
1663 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1664 | int sig, u32 secid) | |
1665 | { | |
ecfcc53f EB |
1666 | struct smk_audit_info ad; |
1667 | ||
1668 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1669 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1670 | /* |
1671 | * Sending a signal requires that the sender | |
1672 | * can write the receiver. | |
1673 | */ | |
1674 | if (secid == 0) | |
676dac4b CS |
1675 | return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE, |
1676 | &ad); | |
e114e473 CS |
1677 | /* |
1678 | * If the secid isn't 0 we're dealing with some USB IO | |
1679 | * specific behavior. This is not clean. For one thing | |
1680 | * we can't take privilege into account. | |
1681 | */ | |
676dac4b CS |
1682 | return smk_access(smack_from_secid(secid), |
1683 | smk_of_task(task_security(p)), MAY_WRITE, &ad); | |
e114e473 CS |
1684 | } |
1685 | ||
1686 | /** | |
1687 | * smack_task_wait - Smack access check for waiting | |
1688 | * @p: task to wait for | |
1689 | * | |
1690 | * Returns 0 if current can wait for p, error code otherwise | |
1691 | */ | |
1692 | static int smack_task_wait(struct task_struct *p) | |
1693 | { | |
ecfcc53f | 1694 | struct smk_audit_info ad; |
676dac4b CS |
1695 | char *sp = smk_of_current(); |
1696 | char *tsp = smk_of_forked(task_security(p)); | |
e114e473 CS |
1697 | int rc; |
1698 | ||
ecfcc53f | 1699 | /* we don't log here, we can be overriden */ |
676dac4b | 1700 | rc = smk_access(tsp, sp, MAY_WRITE, NULL); |
e114e473 | 1701 | if (rc == 0) |
ecfcc53f | 1702 | goto out_log; |
e114e473 CS |
1703 | |
1704 | /* | |
1705 | * Allow the operation to succeed if either task | |
1706 | * has privilege to perform operations that might | |
1707 | * account for the smack labels having gotten to | |
1708 | * be different in the first place. | |
1709 | * | |
5cd9c58f | 1710 | * This breaks the strict subject/object access |
e114e473 CS |
1711 | * control ideal, taking the object's privilege |
1712 | * state into account in the decision as well as | |
1713 | * the smack value. | |
1714 | */ | |
5cd9c58f | 1715 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1716 | rc = 0; |
1717 | /* we log only if we didn't get overriden */ | |
1718 | out_log: | |
1719 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1720 | smk_ad_setfield_u_tsk(&ad, p); | |
676dac4b | 1721 | smack_log(tsp, sp, MAY_WRITE, rc, &ad); |
e114e473 CS |
1722 | return rc; |
1723 | } | |
1724 | ||
1725 | /** | |
1726 | * smack_task_to_inode - copy task smack into the inode blob | |
1727 | * @p: task to copy from | |
251a2a95 | 1728 | * @inode: inode to copy to |
e114e473 CS |
1729 | * |
1730 | * Sets the smack pointer in the inode security blob | |
1731 | */ | |
1732 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1733 | { | |
1734 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 1735 | isp->smk_inode = smk_of_task(task_security(p)); |
e114e473 CS |
1736 | } |
1737 | ||
1738 | /* | |
1739 | * Socket hooks. | |
1740 | */ | |
1741 | ||
1742 | /** | |
1743 | * smack_sk_alloc_security - Allocate a socket blob | |
1744 | * @sk: the socket | |
1745 | * @family: unused | |
251a2a95 | 1746 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1747 | * |
1748 | * Assign Smack pointers to current | |
1749 | * | |
1750 | * Returns 0 on success, -ENOMEM is there's no memory | |
1751 | */ | |
1752 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1753 | { | |
676dac4b | 1754 | char *csp = smk_of_current(); |
e114e473 CS |
1755 | struct socket_smack *ssp; |
1756 | ||
1757 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1758 | if (ssp == NULL) | |
1759 | return -ENOMEM; | |
1760 | ||
1761 | ssp->smk_in = csp; | |
1762 | ssp->smk_out = csp; | |
272cd7a8 | 1763 | ssp->smk_packet = NULL; |
e114e473 CS |
1764 | |
1765 | sk->sk_security = ssp; | |
1766 | ||
1767 | return 0; | |
1768 | } | |
1769 | ||
1770 | /** | |
1771 | * smack_sk_free_security - Free a socket blob | |
1772 | * @sk: the socket | |
1773 | * | |
1774 | * Clears the blob pointer | |
1775 | */ | |
1776 | static void smack_sk_free_security(struct sock *sk) | |
1777 | { | |
1778 | kfree(sk->sk_security); | |
1779 | } | |
1780 | ||
07feee8f PM |
1781 | /** |
1782 | * smack_host_label - check host based restrictions | |
1783 | * @sip: the object end | |
1784 | * | |
1785 | * looks for host based access restrictions | |
1786 | * | |
1787 | * This version will only be appropriate for really small sets of single label | |
1788 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1789 | * taken before calling this function. | |
1790 | * | |
1791 | * Returns the label of the far end or NULL if it's not special. | |
1792 | */ | |
1793 | static char *smack_host_label(struct sockaddr_in *sip) | |
1794 | { | |
1795 | struct smk_netlbladdr *snp; | |
1796 | struct in_addr *siap = &sip->sin_addr; | |
1797 | ||
1798 | if (siap->s_addr == 0) | |
1799 | return NULL; | |
1800 | ||
1801 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1802 | /* | |
1803 | * we break after finding the first match because | |
1804 | * the list is sorted from longest to shortest mask | |
1805 | * so we have found the most specific match | |
1806 | */ | |
1807 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1808 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1809 | /* we have found the special CIPSO option */ | |
1810 | if (snp->smk_label == smack_cipso_option) | |
1811 | return NULL; | |
07feee8f | 1812 | return snp->smk_label; |
4303154e | 1813 | } |
07feee8f PM |
1814 | |
1815 | return NULL; | |
1816 | } | |
1817 | ||
e114e473 CS |
1818 | /** |
1819 | * smack_set_catset - convert a capset to netlabel mls categories | |
1820 | * @catset: the Smack categories | |
1821 | * @sap: where to put the netlabel categories | |
1822 | * | |
1823 | * Allocates and fills attr.mls.cat | |
1824 | */ | |
1825 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1826 | { | |
1827 | unsigned char *cp; | |
1828 | unsigned char m; | |
1829 | int cat; | |
1830 | int rc; | |
1831 | int byte; | |
1832 | ||
c60264c4 | 1833 | if (!catset) |
e114e473 CS |
1834 | return; |
1835 | ||
1836 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1837 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1838 | sap->attr.mls.cat->startbit = 0; | |
1839 | ||
1840 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1841 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1842 | if ((m & *cp) == 0) | |
1843 | continue; | |
1844 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1845 | cat, GFP_ATOMIC); | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | /** | |
1850 | * smack_to_secattr - fill a secattr from a smack value | |
1851 | * @smack: the smack value | |
1852 | * @nlsp: where the result goes | |
1853 | * | |
1854 | * Casey says that CIPSO is good enough for now. | |
1855 | * It can be used to effect. | |
1856 | * It can also be abused to effect when necessary. | |
25985edc | 1857 | * Apologies to the TSIG group in general and GW in particular. |
e114e473 CS |
1858 | */ |
1859 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1860 | { | |
1861 | struct smack_cipso cipso; | |
1862 | int rc; | |
1863 | ||
6d3dc07c CS |
1864 | nlsp->domain = smack; |
1865 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1866 | |
6d3dc07c CS |
1867 | rc = smack_to_cipso(smack, &cipso); |
1868 | if (rc == 0) { | |
1869 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1870 | smack_set_catset(cipso.smk_catset, nlsp); | |
1871 | } else { | |
1872 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1873 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1874 | } |
1875 | } | |
1876 | ||
1877 | /** | |
1878 | * smack_netlabel - Set the secattr on a socket | |
1879 | * @sk: the socket | |
6d3dc07c | 1880 | * @labeled: socket label scheme |
e114e473 CS |
1881 | * |
1882 | * Convert the outbound smack value (smk_out) to a | |
1883 | * secattr and attach it to the socket. | |
1884 | * | |
1885 | * Returns 0 on success or an error code | |
1886 | */ | |
6d3dc07c | 1887 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1888 | { |
07feee8f | 1889 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1890 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1891 | int rc = 0; |
e114e473 | 1892 | |
6d3dc07c CS |
1893 | /* |
1894 | * Usually the netlabel code will handle changing the | |
1895 | * packet labeling based on the label. | |
1896 | * The case of a single label host is different, because | |
1897 | * a single label host should never get a labeled packet | |
1898 | * even though the label is usually associated with a packet | |
1899 | * label. | |
1900 | */ | |
1901 | local_bh_disable(); | |
1902 | bh_lock_sock_nested(sk); | |
1903 | ||
1904 | if (ssp->smk_out == smack_net_ambient || | |
1905 | labeled == SMACK_UNLABELED_SOCKET) | |
1906 | netlbl_sock_delattr(sk); | |
1907 | else { | |
1908 | netlbl_secattr_init(&secattr); | |
1909 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1910 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1911 | netlbl_secattr_destroy(&secattr); |
1912 | } | |
1913 | ||
1914 | bh_unlock_sock(sk); | |
1915 | local_bh_enable(); | |
4bc87e62 | 1916 | |
e114e473 CS |
1917 | return rc; |
1918 | } | |
1919 | ||
07feee8f PM |
1920 | /** |
1921 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1922 | * @sk: the socket | |
1923 | * @sap: the destination address | |
1924 | * | |
1925 | * Set the correct secattr for the given socket based on the destination | |
1926 | * address and perform any outbound access checks needed. | |
1927 | * | |
1928 | * Returns 0 on success or an error code. | |
1929 | * | |
1930 | */ | |
1931 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1932 | { | |
1933 | int rc; | |
1934 | int sk_lbl; | |
1935 | char *hostsp; | |
1936 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1937 | struct smk_audit_info ad; |
07feee8f PM |
1938 | |
1939 | rcu_read_lock(); | |
1940 | hostsp = smack_host_label(sap); | |
1941 | if (hostsp != NULL) { | |
1942 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1943 | #ifdef CONFIG_AUDIT |
1944 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1945 | ad.a.u.net.family = sap->sin_family; | |
1946 | ad.a.u.net.dport = sap->sin_port; | |
1947 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1948 | #endif | |
1949 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1950 | } else { |
1951 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1952 | rc = 0; | |
1953 | } | |
1954 | rcu_read_unlock(); | |
1955 | if (rc != 0) | |
1956 | return rc; | |
1957 | ||
1958 | return smack_netlabel(sk, sk_lbl); | |
1959 | } | |
1960 | ||
e114e473 CS |
1961 | /** |
1962 | * smack_inode_setsecurity - set smack xattrs | |
1963 | * @inode: the object | |
1964 | * @name: attribute name | |
1965 | * @value: attribute value | |
1966 | * @size: size of the attribute | |
1967 | * @flags: unused | |
1968 | * | |
1969 | * Sets the named attribute in the appropriate blob | |
1970 | * | |
1971 | * Returns 0 on success, or an error code | |
1972 | */ | |
1973 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1974 | const void *value, size_t size, int flags) | |
1975 | { | |
1976 | char *sp; | |
1977 | struct inode_smack *nsp = inode->i_security; | |
1978 | struct socket_smack *ssp; | |
1979 | struct socket *sock; | |
4bc87e62 | 1980 | int rc = 0; |
e114e473 | 1981 | |
4303154e | 1982 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1983 | return -EACCES; |
1984 | ||
1985 | sp = smk_import(value, size); | |
1986 | if (sp == NULL) | |
1987 | return -EINVAL; | |
1988 | ||
1989 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1990 | nsp->smk_inode = sp; | |
ddd29ec6 | 1991 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1992 | return 0; |
1993 | } | |
1994 | /* | |
1995 | * The rest of the Smack xattrs are only on sockets. | |
1996 | */ | |
1997 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1998 | return -EOPNOTSUPP; | |
1999 | ||
2000 | sock = SOCKET_I(inode); | |
2e1d146a | 2001 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2002 | return -EOPNOTSUPP; |
2003 | ||
2004 | ssp = sock->sk->sk_security; | |
2005 | ||
2006 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
2007 | ssp->smk_in = sp; | |
2008 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
2009 | ssp->smk_out = sp; | |
b4e0d5f0 CS |
2010 | if (sock->sk->sk_family != PF_UNIX) { |
2011 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); | |
2012 | if (rc != 0) | |
2013 | printk(KERN_WARNING | |
2014 | "Smack: \"%s\" netlbl error %d.\n", | |
2015 | __func__, -rc); | |
2016 | } | |
e114e473 CS |
2017 | } else |
2018 | return -EOPNOTSUPP; | |
2019 | ||
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | /** | |
2024 | * smack_socket_post_create - finish socket setup | |
2025 | * @sock: the socket | |
2026 | * @family: protocol family | |
2027 | * @type: unused | |
2028 | * @protocol: unused | |
2029 | * @kern: unused | |
2030 | * | |
2031 | * Sets the netlabel information on the socket | |
2032 | * | |
2033 | * Returns 0 on success, and error code otherwise | |
2034 | */ | |
2035 | static int smack_socket_post_create(struct socket *sock, int family, | |
2036 | int type, int protocol, int kern) | |
2037 | { | |
2e1d146a | 2038 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
2039 | return 0; |
2040 | /* | |
2041 | * Set the outbound netlbl. | |
2042 | */ | |
6d3dc07c CS |
2043 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2044 | } | |
2045 | ||
6d3dc07c CS |
2046 | /** |
2047 | * smack_socket_connect - connect access check | |
2048 | * @sock: the socket | |
2049 | * @sap: the other end | |
2050 | * @addrlen: size of sap | |
2051 | * | |
2052 | * Verifies that a connection may be possible | |
2053 | * | |
2054 | * Returns 0 on success, and error code otherwise | |
2055 | */ | |
2056 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2057 | int addrlen) | |
2058 | { | |
6d3dc07c CS |
2059 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
2060 | return 0; | |
6d3dc07c CS |
2061 | if (addrlen < sizeof(struct sockaddr_in)) |
2062 | return -EINVAL; | |
2063 | ||
07feee8f | 2064 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
2065 | } |
2066 | ||
2067 | /** | |
2068 | * smack_flags_to_may - convert S_ to MAY_ values | |
2069 | * @flags: the S_ value | |
2070 | * | |
2071 | * Returns the equivalent MAY_ value | |
2072 | */ | |
2073 | static int smack_flags_to_may(int flags) | |
2074 | { | |
2075 | int may = 0; | |
2076 | ||
2077 | if (flags & S_IRUGO) | |
2078 | may |= MAY_READ; | |
2079 | if (flags & S_IWUGO) | |
2080 | may |= MAY_WRITE; | |
2081 | if (flags & S_IXUGO) | |
2082 | may |= MAY_EXEC; | |
2083 | ||
2084 | return may; | |
2085 | } | |
2086 | ||
2087 | /** | |
2088 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2089 | * @msg: the object | |
2090 | * | |
2091 | * Returns 0 | |
2092 | */ | |
2093 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2094 | { | |
676dac4b | 2095 | msg->security = smk_of_current(); |
e114e473 CS |
2096 | return 0; |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2101 | * @msg: the object | |
2102 | * | |
2103 | * Clears the blob pointer | |
2104 | */ | |
2105 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2106 | { | |
2107 | msg->security = NULL; | |
2108 | } | |
2109 | ||
2110 | /** | |
2111 | * smack_of_shm - the smack pointer for the shm | |
2112 | * @shp: the object | |
2113 | * | |
2114 | * Returns a pointer to the smack value | |
2115 | */ | |
2116 | static char *smack_of_shm(struct shmid_kernel *shp) | |
2117 | { | |
2118 | return (char *)shp->shm_perm.security; | |
2119 | } | |
2120 | ||
2121 | /** | |
2122 | * smack_shm_alloc_security - Set the security blob for shm | |
2123 | * @shp: the object | |
2124 | * | |
2125 | * Returns 0 | |
2126 | */ | |
2127 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
2128 | { | |
2129 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2130 | ||
676dac4b | 2131 | isp->security = smk_of_current(); |
e114e473 CS |
2132 | return 0; |
2133 | } | |
2134 | ||
2135 | /** | |
2136 | * smack_shm_free_security - Clear the security blob for shm | |
2137 | * @shp: the object | |
2138 | * | |
2139 | * Clears the blob pointer | |
2140 | */ | |
2141 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
2142 | { | |
2143 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
2144 | ||
2145 | isp->security = NULL; | |
2146 | } | |
2147 | ||
ecfcc53f EB |
2148 | /** |
2149 | * smk_curacc_shm : check if current has access on shm | |
2150 | * @shp : the object | |
2151 | * @access : access requested | |
2152 | * | |
2153 | * Returns 0 if current has the requested access, error code otherwise | |
2154 | */ | |
2155 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
2156 | { | |
2157 | char *ssp = smack_of_shm(shp); | |
2158 | struct smk_audit_info ad; | |
2159 | ||
2160 | #ifdef CONFIG_AUDIT | |
2161 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2162 | ad.a.u.ipc_id = shp->shm_perm.id; | |
2163 | #endif | |
2164 | return smk_curacc(ssp, access, &ad); | |
2165 | } | |
2166 | ||
e114e473 CS |
2167 | /** |
2168 | * smack_shm_associate - Smack access check for shm | |
2169 | * @shp: the object | |
2170 | * @shmflg: access requested | |
2171 | * | |
2172 | * Returns 0 if current has the requested access, error code otherwise | |
2173 | */ | |
2174 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
2175 | { | |
e114e473 CS |
2176 | int may; |
2177 | ||
2178 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2179 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2180 | } |
2181 | ||
2182 | /** | |
2183 | * smack_shm_shmctl - Smack access check for shm | |
2184 | * @shp: the object | |
2185 | * @cmd: what it wants to do | |
2186 | * | |
2187 | * Returns 0 if current has the requested access, error code otherwise | |
2188 | */ | |
2189 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
2190 | { | |
e114e473 CS |
2191 | int may; |
2192 | ||
2193 | switch (cmd) { | |
2194 | case IPC_STAT: | |
2195 | case SHM_STAT: | |
2196 | may = MAY_READ; | |
2197 | break; | |
2198 | case IPC_SET: | |
2199 | case SHM_LOCK: | |
2200 | case SHM_UNLOCK: | |
2201 | case IPC_RMID: | |
2202 | may = MAY_READWRITE; | |
2203 | break; | |
2204 | case IPC_INFO: | |
2205 | case SHM_INFO: | |
2206 | /* | |
2207 | * System level information. | |
2208 | */ | |
2209 | return 0; | |
2210 | default: | |
2211 | return -EINVAL; | |
2212 | } | |
ecfcc53f | 2213 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2214 | } |
2215 | ||
2216 | /** | |
2217 | * smack_shm_shmat - Smack access for shmat | |
2218 | * @shp: the object | |
2219 | * @shmaddr: unused | |
2220 | * @shmflg: access requested | |
2221 | * | |
2222 | * Returns 0 if current has the requested access, error code otherwise | |
2223 | */ | |
2224 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
2225 | int shmflg) | |
2226 | { | |
e114e473 CS |
2227 | int may; |
2228 | ||
2229 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 2230 | return smk_curacc_shm(shp, may); |
e114e473 CS |
2231 | } |
2232 | ||
2233 | /** | |
2234 | * smack_of_sem - the smack pointer for the sem | |
2235 | * @sma: the object | |
2236 | * | |
2237 | * Returns a pointer to the smack value | |
2238 | */ | |
2239 | static char *smack_of_sem(struct sem_array *sma) | |
2240 | { | |
2241 | return (char *)sma->sem_perm.security; | |
2242 | } | |
2243 | ||
2244 | /** | |
2245 | * smack_sem_alloc_security - Set the security blob for sem | |
2246 | * @sma: the object | |
2247 | * | |
2248 | * Returns 0 | |
2249 | */ | |
2250 | static int smack_sem_alloc_security(struct sem_array *sma) | |
2251 | { | |
2252 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2253 | ||
676dac4b | 2254 | isp->security = smk_of_current(); |
e114e473 CS |
2255 | return 0; |
2256 | } | |
2257 | ||
2258 | /** | |
2259 | * smack_sem_free_security - Clear the security blob for sem | |
2260 | * @sma: the object | |
2261 | * | |
2262 | * Clears the blob pointer | |
2263 | */ | |
2264 | static void smack_sem_free_security(struct sem_array *sma) | |
2265 | { | |
2266 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
2267 | ||
2268 | isp->security = NULL; | |
2269 | } | |
2270 | ||
ecfcc53f EB |
2271 | /** |
2272 | * smk_curacc_sem : check if current has access on sem | |
2273 | * @sma : the object | |
2274 | * @access : access requested | |
2275 | * | |
2276 | * Returns 0 if current has the requested access, error code otherwise | |
2277 | */ | |
2278 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
2279 | { | |
2280 | char *ssp = smack_of_sem(sma); | |
2281 | struct smk_audit_info ad; | |
2282 | ||
2283 | #ifdef CONFIG_AUDIT | |
2284 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2285 | ad.a.u.ipc_id = sma->sem_perm.id; | |
2286 | #endif | |
2287 | return smk_curacc(ssp, access, &ad); | |
2288 | } | |
2289 | ||
e114e473 CS |
2290 | /** |
2291 | * smack_sem_associate - Smack access check for sem | |
2292 | * @sma: the object | |
2293 | * @semflg: access requested | |
2294 | * | |
2295 | * Returns 0 if current has the requested access, error code otherwise | |
2296 | */ | |
2297 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
2298 | { | |
e114e473 CS |
2299 | int may; |
2300 | ||
2301 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 2302 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2303 | } |
2304 | ||
2305 | /** | |
2306 | * smack_sem_shmctl - Smack access check for sem | |
2307 | * @sma: the object | |
2308 | * @cmd: what it wants to do | |
2309 | * | |
2310 | * Returns 0 if current has the requested access, error code otherwise | |
2311 | */ | |
2312 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
2313 | { | |
e114e473 CS |
2314 | int may; |
2315 | ||
2316 | switch (cmd) { | |
2317 | case GETPID: | |
2318 | case GETNCNT: | |
2319 | case GETZCNT: | |
2320 | case GETVAL: | |
2321 | case GETALL: | |
2322 | case IPC_STAT: | |
2323 | case SEM_STAT: | |
2324 | may = MAY_READ; | |
2325 | break; | |
2326 | case SETVAL: | |
2327 | case SETALL: | |
2328 | case IPC_RMID: | |
2329 | case IPC_SET: | |
2330 | may = MAY_READWRITE; | |
2331 | break; | |
2332 | case IPC_INFO: | |
2333 | case SEM_INFO: | |
2334 | /* | |
2335 | * System level information | |
2336 | */ | |
2337 | return 0; | |
2338 | default: | |
2339 | return -EINVAL; | |
2340 | } | |
2341 | ||
ecfcc53f | 2342 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2343 | } |
2344 | ||
2345 | /** | |
2346 | * smack_sem_semop - Smack checks of semaphore operations | |
2347 | * @sma: the object | |
2348 | * @sops: unused | |
2349 | * @nsops: unused | |
2350 | * @alter: unused | |
2351 | * | |
2352 | * Treated as read and write in all cases. | |
2353 | * | |
2354 | * Returns 0 if access is allowed, error code otherwise | |
2355 | */ | |
2356 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2357 | unsigned nsops, int alter) | |
2358 | { | |
ecfcc53f | 2359 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2360 | } |
2361 | ||
2362 | /** | |
2363 | * smack_msg_alloc_security - Set the security blob for msg | |
2364 | * @msq: the object | |
2365 | * | |
2366 | * Returns 0 | |
2367 | */ | |
2368 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2369 | { | |
2370 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2371 | ||
676dac4b | 2372 | kisp->security = smk_of_current(); |
e114e473 CS |
2373 | return 0; |
2374 | } | |
2375 | ||
2376 | /** | |
2377 | * smack_msg_free_security - Clear the security blob for msg | |
2378 | * @msq: the object | |
2379 | * | |
2380 | * Clears the blob pointer | |
2381 | */ | |
2382 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2383 | { | |
2384 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2385 | ||
2386 | kisp->security = NULL; | |
2387 | } | |
2388 | ||
2389 | /** | |
2390 | * smack_of_msq - the smack pointer for the msq | |
2391 | * @msq: the object | |
2392 | * | |
2393 | * Returns a pointer to the smack value | |
2394 | */ | |
2395 | static char *smack_of_msq(struct msg_queue *msq) | |
2396 | { | |
2397 | return (char *)msq->q_perm.security; | |
2398 | } | |
2399 | ||
ecfcc53f EB |
2400 | /** |
2401 | * smk_curacc_msq : helper to check if current has access on msq | |
2402 | * @msq : the msq | |
2403 | * @access : access requested | |
2404 | * | |
2405 | * return 0 if current has access, error otherwise | |
2406 | */ | |
2407 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2408 | { | |
2409 | char *msp = smack_of_msq(msq); | |
2410 | struct smk_audit_info ad; | |
2411 | ||
2412 | #ifdef CONFIG_AUDIT | |
2413 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2414 | ad.a.u.ipc_id = msq->q_perm.id; | |
2415 | #endif | |
2416 | return smk_curacc(msp, access, &ad); | |
2417 | } | |
2418 | ||
e114e473 CS |
2419 | /** |
2420 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2421 | * @msq: the object | |
2422 | * @msqflg: access requested | |
2423 | * | |
2424 | * Returns 0 if current has the requested access, error code otherwise | |
2425 | */ | |
2426 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2427 | { | |
e114e473 CS |
2428 | int may; |
2429 | ||
2430 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2431 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2432 | } |
2433 | ||
2434 | /** | |
2435 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2436 | * @msq: the object | |
2437 | * @cmd: what it wants to do | |
2438 | * | |
2439 | * Returns 0 if current has the requested access, error code otherwise | |
2440 | */ | |
2441 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2442 | { | |
e114e473 CS |
2443 | int may; |
2444 | ||
2445 | switch (cmd) { | |
2446 | case IPC_STAT: | |
2447 | case MSG_STAT: | |
2448 | may = MAY_READ; | |
2449 | break; | |
2450 | case IPC_SET: | |
2451 | case IPC_RMID: | |
2452 | may = MAY_READWRITE; | |
2453 | break; | |
2454 | case IPC_INFO: | |
2455 | case MSG_INFO: | |
2456 | /* | |
2457 | * System level information | |
2458 | */ | |
2459 | return 0; | |
2460 | default: | |
2461 | return -EINVAL; | |
2462 | } | |
2463 | ||
ecfcc53f | 2464 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2465 | } |
2466 | ||
2467 | /** | |
2468 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2469 | * @msq: the object | |
2470 | * @msg: unused | |
2471 | * @msqflg: access requested | |
2472 | * | |
2473 | * Returns 0 if current has the requested access, error code otherwise | |
2474 | */ | |
2475 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2476 | int msqflg) | |
2477 | { | |
ecfcc53f | 2478 | int may; |
e114e473 | 2479 | |
ecfcc53f EB |
2480 | may = smack_flags_to_may(msqflg); |
2481 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2482 | } |
2483 | ||
2484 | /** | |
2485 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2486 | * @msq: the object | |
2487 | * @msg: unused | |
2488 | * @target: unused | |
2489 | * @type: unused | |
2490 | * @mode: unused | |
2491 | * | |
2492 | * Returns 0 if current has read and write access, error code otherwise | |
2493 | */ | |
2494 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2495 | struct task_struct *target, long type, int mode) | |
2496 | { | |
ecfcc53f | 2497 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2498 | } |
2499 | ||
2500 | /** | |
2501 | * smack_ipc_permission - Smack access for ipc_permission() | |
2502 | * @ipp: the object permissions | |
2503 | * @flag: access requested | |
2504 | * | |
2505 | * Returns 0 if current has read and write access, error code otherwise | |
2506 | */ | |
2507 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2508 | { | |
2509 | char *isp = ipp->security; | |
ecfcc53f EB |
2510 | int may = smack_flags_to_may(flag); |
2511 | struct smk_audit_info ad; | |
e114e473 | 2512 | |
ecfcc53f EB |
2513 | #ifdef CONFIG_AUDIT |
2514 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2515 | ad.a.u.ipc_id = ipp->id; | |
2516 | #endif | |
2517 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2518 | } |
2519 | ||
d20bdda6 AD |
2520 | /** |
2521 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2522 | * @ipp: the object permissions |
d20bdda6 AD |
2523 | * @secid: where result will be saved |
2524 | */ | |
2525 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2526 | { | |
2527 | char *smack = ipp->security; | |
2528 | ||
2529 | *secid = smack_to_secid(smack); | |
2530 | } | |
2531 | ||
e114e473 CS |
2532 | /** |
2533 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 2534 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
2535 | * @inode: the object |
2536 | * | |
2537 | * Set the inode's security blob if it hasn't been done already. | |
2538 | */ | |
2539 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2540 | { | |
2541 | struct super_block *sbp; | |
2542 | struct superblock_smack *sbsp; | |
2543 | struct inode_smack *isp; | |
676dac4b | 2544 | char *csp = smk_of_current(); |
e114e473 CS |
2545 | char *fetched; |
2546 | char *final; | |
5c6d1125 JS |
2547 | char trattr[TRANS_TRUE_SIZE]; |
2548 | int transflag = 0; | |
e114e473 CS |
2549 | struct dentry *dp; |
2550 | ||
2551 | if (inode == NULL) | |
2552 | return; | |
2553 | ||
2554 | isp = inode->i_security; | |
2555 | ||
2556 | mutex_lock(&isp->smk_lock); | |
2557 | /* | |
2558 | * If the inode is already instantiated | |
2559 | * take the quick way out | |
2560 | */ | |
2561 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2562 | goto unlockandout; | |
2563 | ||
2564 | sbp = inode->i_sb; | |
2565 | sbsp = sbp->s_security; | |
2566 | /* | |
2567 | * We're going to use the superblock default label | |
2568 | * if there's no label on the file. | |
2569 | */ | |
2570 | final = sbsp->smk_default; | |
2571 | ||
e97dcb0e CS |
2572 | /* |
2573 | * If this is the root inode the superblock | |
2574 | * may be in the process of initialization. | |
2575 | * If that is the case use the root value out | |
2576 | * of the superblock. | |
2577 | */ | |
2578 | if (opt_dentry->d_parent == opt_dentry) { | |
2579 | isp->smk_inode = sbsp->smk_root; | |
2580 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2581 | goto unlockandout; | |
2582 | } | |
2583 | ||
e114e473 CS |
2584 | /* |
2585 | * This is pretty hackish. | |
2586 | * Casey says that we shouldn't have to do | |
2587 | * file system specific code, but it does help | |
2588 | * with keeping it simple. | |
2589 | */ | |
2590 | switch (sbp->s_magic) { | |
2591 | case SMACK_MAGIC: | |
2592 | /* | |
25985edc | 2593 | * Casey says that it's a little embarrassing |
e114e473 CS |
2594 | * that the smack file system doesn't do |
2595 | * extended attributes. | |
2596 | */ | |
2597 | final = smack_known_star.smk_known; | |
2598 | break; | |
2599 | case PIPEFS_MAGIC: | |
2600 | /* | |
2601 | * Casey says pipes are easy (?) | |
2602 | */ | |
2603 | final = smack_known_star.smk_known; | |
2604 | break; | |
2605 | case DEVPTS_SUPER_MAGIC: | |
2606 | /* | |
2607 | * devpts seems content with the label of the task. | |
2608 | * Programs that change smack have to treat the | |
2609 | * pty with respect. | |
2610 | */ | |
2611 | final = csp; | |
2612 | break; | |
2613 | case SOCKFS_MAGIC: | |
2614 | /* | |
b4e0d5f0 CS |
2615 | * Socket access is controlled by the socket |
2616 | * structures associated with the task involved. | |
e114e473 | 2617 | */ |
b4e0d5f0 | 2618 | final = smack_known_star.smk_known; |
e114e473 CS |
2619 | break; |
2620 | case PROC_SUPER_MAGIC: | |
2621 | /* | |
2622 | * Casey says procfs appears not to care. | |
2623 | * The superblock default suffices. | |
2624 | */ | |
2625 | break; | |
2626 | case TMPFS_MAGIC: | |
2627 | /* | |
2628 | * Device labels should come from the filesystem, | |
2629 | * but watch out, because they're volitile, | |
2630 | * getting recreated on every reboot. | |
2631 | */ | |
2632 | final = smack_known_star.smk_known; | |
2633 | /* | |
2634 | * No break. | |
2635 | * | |
2636 | * If a smack value has been set we want to use it, | |
2637 | * but since tmpfs isn't giving us the opportunity | |
2638 | * to set mount options simulate setting the | |
2639 | * superblock default. | |
2640 | */ | |
2641 | default: | |
2642 | /* | |
2643 | * This isn't an understood special case. | |
2644 | * Get the value from the xattr. | |
b4e0d5f0 CS |
2645 | */ |
2646 | ||
2647 | /* | |
2648 | * UNIX domain sockets use lower level socket data. | |
2649 | */ | |
2650 | if (S_ISSOCK(inode->i_mode)) { | |
2651 | final = smack_known_star.smk_known; | |
2652 | break; | |
2653 | } | |
2654 | /* | |
e114e473 CS |
2655 | * No xattr support means, alas, no SMACK label. |
2656 | * Use the aforeapplied default. | |
2657 | * It would be curious if the label of the task | |
2658 | * does not match that assigned. | |
2659 | */ | |
2660 | if (inode->i_op->getxattr == NULL) | |
2661 | break; | |
2662 | /* | |
2663 | * Get the dentry for xattr. | |
2664 | */ | |
3e62cbb8 | 2665 | dp = dget(opt_dentry); |
676dac4b | 2666 | fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
5c6d1125 | 2667 | if (fetched != NULL) { |
e114e473 | 2668 | final = fetched; |
5c6d1125 JS |
2669 | if (S_ISDIR(inode->i_mode)) { |
2670 | trattr[0] = '\0'; | |
2671 | inode->i_op->getxattr(dp, | |
2672 | XATTR_NAME_SMACKTRANSMUTE, | |
2673 | trattr, TRANS_TRUE_SIZE); | |
2674 | if (strncmp(trattr, TRANS_TRUE, | |
2675 | TRANS_TRUE_SIZE) == 0) | |
2676 | transflag = SMK_INODE_TRANSMUTE; | |
2677 | } | |
2678 | } | |
2679 | isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
7898e1f8 | 2680 | isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
676dac4b | 2681 | |
e114e473 CS |
2682 | dput(dp); |
2683 | break; | |
2684 | } | |
2685 | ||
2686 | if (final == NULL) | |
2687 | isp->smk_inode = csp; | |
2688 | else | |
2689 | isp->smk_inode = final; | |
2690 | ||
5c6d1125 | 2691 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
2692 | |
2693 | unlockandout: | |
2694 | mutex_unlock(&isp->smk_lock); | |
2695 | return; | |
2696 | } | |
2697 | ||
2698 | /** | |
2699 | * smack_getprocattr - Smack process attribute access | |
2700 | * @p: the object task | |
2701 | * @name: the name of the attribute in /proc/.../attr | |
2702 | * @value: where to put the result | |
2703 | * | |
2704 | * Places a copy of the task Smack into value | |
2705 | * | |
2706 | * Returns the length of the smack label or an error code | |
2707 | */ | |
2708 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2709 | { | |
2710 | char *cp; | |
2711 | int slen; | |
2712 | ||
2713 | if (strcmp(name, "current") != 0) | |
2714 | return -EINVAL; | |
2715 | ||
676dac4b | 2716 | cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL); |
e114e473 CS |
2717 | if (cp == NULL) |
2718 | return -ENOMEM; | |
2719 | ||
2720 | slen = strlen(cp); | |
2721 | *value = cp; | |
2722 | return slen; | |
2723 | } | |
2724 | ||
2725 | /** | |
2726 | * smack_setprocattr - Smack process attribute setting | |
2727 | * @p: the object task | |
2728 | * @name: the name of the attribute in /proc/.../attr | |
2729 | * @value: the value to set | |
2730 | * @size: the size of the value | |
2731 | * | |
2732 | * Sets the Smack value of the task. Only setting self | |
2733 | * is permitted and only with privilege | |
2734 | * | |
2735 | * Returns the length of the smack label or an error code | |
2736 | */ | |
2737 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2738 | void *value, size_t size) | |
2739 | { | |
7898e1f8 | 2740 | int rc; |
676dac4b | 2741 | struct task_smack *tsp; |
5c6d1125 | 2742 | struct task_smack *oldtsp; |
d84f4f99 | 2743 | struct cred *new; |
e114e473 CS |
2744 | char *newsmack; |
2745 | ||
e114e473 CS |
2746 | /* |
2747 | * Changing another process' Smack value is too dangerous | |
2748 | * and supports no sane use case. | |
2749 | */ | |
2750 | if (p != current) | |
2751 | return -EPERM; | |
2752 | ||
5cd9c58f DH |
2753 | if (!capable(CAP_MAC_ADMIN)) |
2754 | return -EPERM; | |
2755 | ||
e114e473 CS |
2756 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2757 | return -EINVAL; | |
2758 | ||
2759 | if (strcmp(name, "current") != 0) | |
2760 | return -EINVAL; | |
2761 | ||
2762 | newsmack = smk_import(value, size); | |
2763 | if (newsmack == NULL) | |
2764 | return -EINVAL; | |
2765 | ||
6d3dc07c CS |
2766 | /* |
2767 | * No process is ever allowed the web ("@") label. | |
2768 | */ | |
2769 | if (newsmack == smack_known_web.smk_known) | |
2770 | return -EPERM; | |
2771 | ||
5c6d1125 | 2772 | oldtsp = p->cred->security; |
d84f4f99 | 2773 | new = prepare_creds(); |
6d3dc07c | 2774 | if (new == NULL) |
d84f4f99 | 2775 | return -ENOMEM; |
7898e1f8 CS |
2776 | |
2777 | tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL); | |
676dac4b CS |
2778 | if (tsp == NULL) { |
2779 | kfree(new); | |
2780 | return -ENOMEM; | |
2781 | } | |
7898e1f8 CS |
2782 | rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL); |
2783 | if (rc != 0) | |
2784 | return rc; | |
2785 | ||
676dac4b | 2786 | new->security = tsp; |
d84f4f99 | 2787 | commit_creds(new); |
e114e473 CS |
2788 | return size; |
2789 | } | |
2790 | ||
2791 | /** | |
2792 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
2793 | * @sock: one sock |
2794 | * @other: the other sock | |
e114e473 CS |
2795 | * @newsk: unused |
2796 | * | |
2797 | * Return 0 if a subject with the smack of sock could access | |
2798 | * an object with the smack of other, otherwise an error code | |
2799 | */ | |
3610cda5 DM |
2800 | static int smack_unix_stream_connect(struct sock *sock, |
2801 | struct sock *other, struct sock *newsk) | |
e114e473 | 2802 | { |
d2e7ad19 JM |
2803 | struct socket_smack *ssp = sock->sk_security; |
2804 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 2805 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 2806 | struct smk_audit_info ad; |
b4e0d5f0 | 2807 | int rc = 0; |
e114e473 | 2808 | |
ecfcc53f | 2809 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
3610cda5 | 2810 | smk_ad_setfield_u_net_sk(&ad, other); |
b4e0d5f0 CS |
2811 | |
2812 | if (!capable(CAP_MAC_OVERRIDE)) | |
2813 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2814 | ||
975d5e55 CS |
2815 | /* |
2816 | * Cross reference the peer labels for SO_PEERSEC. | |
2817 | */ | |
2818 | if (rc == 0) { | |
2819 | nsp->smk_packet = ssp->smk_out; | |
2820 | ssp->smk_packet = osp->smk_out; | |
2821 | } | |
2822 | ||
b4e0d5f0 | 2823 | return rc; |
e114e473 CS |
2824 | } |
2825 | ||
2826 | /** | |
2827 | * smack_unix_may_send - Smack access on UDS | |
2828 | * @sock: one socket | |
2829 | * @other: the other socket | |
2830 | * | |
2831 | * Return 0 if a subject with the smack of sock could access | |
2832 | * an object with the smack of other, otherwise an error code | |
2833 | */ | |
2834 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2835 | { | |
b4e0d5f0 CS |
2836 | struct socket_smack *ssp = sock->sk->sk_security; |
2837 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 2838 | struct smk_audit_info ad; |
b4e0d5f0 | 2839 | int rc = 0; |
e114e473 | 2840 | |
ecfcc53f EB |
2841 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2842 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
b4e0d5f0 CS |
2843 | |
2844 | if (!capable(CAP_MAC_OVERRIDE)) | |
2845 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); | |
2846 | ||
2847 | return rc; | |
e114e473 CS |
2848 | } |
2849 | ||
6d3dc07c CS |
2850 | /** |
2851 | * smack_socket_sendmsg - Smack check based on destination host | |
2852 | * @sock: the socket | |
251a2a95 | 2853 | * @msg: the message |
6d3dc07c CS |
2854 | * @size: the size of the message |
2855 | * | |
2856 | * Return 0 if the current subject can write to the destination | |
2857 | * host. This is only a question if the destination is a single | |
2858 | * label host. | |
2859 | */ | |
2860 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2861 | int size) | |
2862 | { | |
2863 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2864 | |
2865 | /* | |
2866 | * Perfectly reasonable for this to be NULL | |
2867 | */ | |
da34d424 | 2868 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2869 | return 0; |
2870 | ||
07feee8f | 2871 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2872 | } |
2873 | ||
e114e473 | 2874 | /** |
251a2a95 | 2875 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 2876 | * @sap: netlabel secattr |
272cd7a8 | 2877 | * @ssp: socket security information |
e114e473 | 2878 | * |
272cd7a8 | 2879 | * Returns a pointer to a Smack label found on the label list. |
e114e473 | 2880 | */ |
272cd7a8 CS |
2881 | static char *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
2882 | struct socket_smack *ssp) | |
e114e473 | 2883 | { |
272cd7a8 | 2884 | struct smack_known *skp; |
e114e473 | 2885 | char smack[SMK_LABELLEN]; |
6d3dc07c | 2886 | char *sp; |
e114e473 CS |
2887 | int pcat; |
2888 | ||
6d3dc07c | 2889 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2890 | /* |
6d3dc07c | 2891 | * Looks like a CIPSO packet. |
e114e473 CS |
2892 | * If there are flags but no level netlabel isn't |
2893 | * behaving the way we expect it to. | |
2894 | * | |
6d3dc07c | 2895 | * Get the categories, if any |
e114e473 CS |
2896 | * Without guidance regarding the smack value |
2897 | * for the packet fall back on the network | |
2898 | * ambient value. | |
2899 | */ | |
6d3dc07c CS |
2900 | memset(smack, '\0', SMK_LABELLEN); |
2901 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2902 | for (pcat = -1;;) { | |
2903 | pcat = netlbl_secattr_catmap_walk( | |
2904 | sap->attr.mls.cat, pcat + 1); | |
2905 | if (pcat < 0) | |
2906 | break; | |
2907 | smack_catset_bit(pcat, smack); | |
2908 | } | |
2909 | /* | |
2910 | * If it is CIPSO using smack direct mapping | |
2911 | * we are already done. WeeHee. | |
2912 | */ | |
2913 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
272cd7a8 CS |
2914 | /* |
2915 | * The label sent is usually on the label list. | |
2916 | * | |
2917 | * If it is not we may still want to allow the | |
2918 | * delivery. | |
2919 | * | |
2920 | * If the recipient is accepting all packets | |
2921 | * because it is using the star ("*") label | |
2922 | * for SMACK64IPIN provide the web ("@") label | |
2923 | * so that a directed response will succeed. | |
2924 | * This is not very correct from a MAC point | |
2925 | * of view, but gets around the problem that | |
2926 | * locking prevents adding the newly discovered | |
2927 | * label to the list. | |
2928 | * The case where the recipient is not using | |
2929 | * the star label should obviously fail. | |
2930 | * The easy way to do this is to provide the | |
2931 | * star label as the subject label. | |
2932 | */ | |
2933 | skp = smk_find_entry(smack); | |
2934 | if (skp != NULL) | |
2935 | return skp->smk_known; | |
2936 | if (ssp != NULL && | |
2937 | ssp->smk_in == smack_known_star.smk_known) | |
2938 | return smack_known_web.smk_known; | |
2939 | return smack_known_star.smk_known; | |
6d3dc07c CS |
2940 | } |
2941 | /* | |
2942 | * Look it up in the supplied table if it is not | |
2943 | * a direct mapping. | |
2944 | */ | |
272cd7a8 CS |
2945 | sp = smack_from_cipso(sap->attr.mls.lvl, smack); |
2946 | if (sp != NULL) | |
2947 | return sp; | |
2948 | if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) | |
2949 | return smack_known_web.smk_known; | |
2950 | return smack_known_star.smk_known; | |
e114e473 | 2951 | } |
6d3dc07c CS |
2952 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2953 | /* | |
2954 | * Looks like a fallback, which gives us a secid. | |
2955 | */ | |
2956 | sp = smack_from_secid(sap->attr.secid); | |
2957 | /* | |
2958 | * This has got to be a bug because it is | |
2959 | * impossible to specify a fallback without | |
2960 | * specifying the label, which will ensure | |
2961 | * it has a secid, and the only way to get a | |
2962 | * secid is from a fallback. | |
2963 | */ | |
2964 | BUG_ON(sp == NULL); | |
272cd7a8 | 2965 | return sp; |
e114e473 CS |
2966 | } |
2967 | /* | |
6d3dc07c CS |
2968 | * Without guidance regarding the smack value |
2969 | * for the packet fall back on the network | |
2970 | * ambient value. | |
e114e473 | 2971 | */ |
272cd7a8 | 2972 | return smack_net_ambient; |
e114e473 CS |
2973 | } |
2974 | ||
2975 | /** | |
2976 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2977 | * @sk: socket | |
2978 | * @skb: packet | |
2979 | * | |
2980 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2981 | */ | |
2982 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2983 | { | |
2984 | struct netlbl_lsm_secattr secattr; | |
2985 | struct socket_smack *ssp = sk->sk_security; | |
6d3dc07c | 2986 | char *csp; |
e114e473 | 2987 | int rc; |
ecfcc53f | 2988 | struct smk_audit_info ad; |
e114e473 CS |
2989 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2990 | return 0; | |
2991 | ||
2992 | /* | |
2993 | * Translate what netlabel gave us. | |
2994 | */ | |
e114e473 | 2995 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2996 | |
e114e473 | 2997 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
272cd7a8 CS |
2998 | if (rc == 0) |
2999 | csp = smack_from_secattr(&secattr, ssp); | |
3000 | else | |
6d3dc07c CS |
3001 | csp = smack_net_ambient; |
3002 | ||
e114e473 | 3003 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3004 | |
ecfcc53f EB |
3005 | #ifdef CONFIG_AUDIT |
3006 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3007 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 3008 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3009 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3010 | #endif | |
e114e473 CS |
3011 | /* |
3012 | * Receiving a packet requires that the other end | |
3013 | * be able to write here. Read access is not required. | |
3014 | * This is the simplist possible security model | |
3015 | * for networking. | |
3016 | */ | |
ecfcc53f | 3017 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
3018 | if (rc != 0) |
3019 | netlbl_skbuff_err(skb, rc, 0); | |
3020 | return rc; | |
e114e473 CS |
3021 | } |
3022 | ||
3023 | /** | |
3024 | * smack_socket_getpeersec_stream - pull in packet label | |
3025 | * @sock: the socket | |
3026 | * @optval: user's destination | |
3027 | * @optlen: size thereof | |
251a2a95 | 3028 | * @len: max thereof |
e114e473 CS |
3029 | * |
3030 | * returns zero on success, an error code otherwise | |
3031 | */ | |
3032 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
3033 | char __user *optval, | |
3034 | int __user *optlen, unsigned len) | |
3035 | { | |
3036 | struct socket_smack *ssp; | |
272cd7a8 CS |
3037 | char *rcp = ""; |
3038 | int slen = 1; | |
e114e473 CS |
3039 | int rc = 0; |
3040 | ||
3041 | ssp = sock->sk->sk_security; | |
272cd7a8 CS |
3042 | if (ssp->smk_packet != NULL) { |
3043 | rcp = ssp->smk_packet; | |
3044 | slen = strlen(rcp) + 1; | |
3045 | } | |
e114e473 CS |
3046 | |
3047 | if (slen > len) | |
3048 | rc = -ERANGE; | |
272cd7a8 | 3049 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
3050 | rc = -EFAULT; |
3051 | ||
3052 | if (put_user(slen, optlen) != 0) | |
3053 | rc = -EFAULT; | |
3054 | ||
3055 | return rc; | |
3056 | } | |
3057 | ||
3058 | ||
3059 | /** | |
3060 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 3061 | * @sock: the peer socket |
e114e473 CS |
3062 | * @skb: packet data |
3063 | * @secid: pointer to where to put the secid of the packet | |
3064 | * | |
3065 | * Sets the netlabel socket state on sk from parent | |
3066 | */ | |
3067 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
3068 | struct sk_buff *skb, u32 *secid) | |
3069 | ||
3070 | { | |
3071 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 CS |
3072 | struct socket_smack *ssp = NULL; |
3073 | char *sp; | |
b4e0d5f0 CS |
3074 | int family = PF_UNSPEC; |
3075 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
3076 | int rc; |
3077 | ||
b4e0d5f0 CS |
3078 | if (skb != NULL) { |
3079 | if (skb->protocol == htons(ETH_P_IP)) | |
3080 | family = PF_INET; | |
3081 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3082 | family = PF_INET6; | |
e114e473 | 3083 | } |
b4e0d5f0 CS |
3084 | if (family == PF_UNSPEC && sock != NULL) |
3085 | family = sock->sk->sk_family; | |
e114e473 | 3086 | |
b4e0d5f0 | 3087 | if (family == PF_UNIX) { |
272cd7a8 CS |
3088 | ssp = sock->sk->sk_security; |
3089 | s = smack_to_secid(ssp->smk_out); | |
b4e0d5f0 CS |
3090 | } else if (family == PF_INET || family == PF_INET6) { |
3091 | /* | |
3092 | * Translate what netlabel gave us. | |
3093 | */ | |
272cd7a8 CS |
3094 | if (sock != NULL && sock->sk != NULL) |
3095 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
3096 | netlbl_secattr_init(&secattr); |
3097 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
3098 | if (rc == 0) { | |
272cd7a8 CS |
3099 | sp = smack_from_secattr(&secattr, ssp); |
3100 | s = smack_to_secid(sp); | |
b4e0d5f0 CS |
3101 | } |
3102 | netlbl_secattr_destroy(&secattr); | |
3103 | } | |
3104 | *secid = s; | |
e114e473 CS |
3105 | if (s == 0) |
3106 | return -EINVAL; | |
e114e473 CS |
3107 | return 0; |
3108 | } | |
3109 | ||
3110 | /** | |
07feee8f PM |
3111 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
3112 | * @sk: child sock | |
3113 | * @parent: parent socket | |
e114e473 | 3114 | * |
07feee8f PM |
3115 | * Set the smk_{in,out} state of an existing sock based on the process that |
3116 | * is creating the new socket. | |
e114e473 CS |
3117 | */ |
3118 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
3119 | { | |
3120 | struct socket_smack *ssp; | |
e114e473 | 3121 | |
07feee8f PM |
3122 | if (sk == NULL || |
3123 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
3124 | return; |
3125 | ||
3126 | ssp = sk->sk_security; | |
676dac4b | 3127 | ssp->smk_in = ssp->smk_out = smk_of_current(); |
07feee8f | 3128 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
3129 | } |
3130 | ||
3131 | /** | |
3132 | * smack_inet_conn_request - Smack access check on connect | |
3133 | * @sk: socket involved | |
3134 | * @skb: packet | |
3135 | * @req: unused | |
3136 | * | |
3137 | * Returns 0 if a task with the packet label could write to | |
3138 | * the socket, otherwise an error code | |
3139 | */ | |
3140 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
3141 | struct request_sock *req) | |
3142 | { | |
07feee8f | 3143 | u16 family = sk->sk_family; |
e114e473 | 3144 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
3145 | struct netlbl_lsm_secattr secattr; |
3146 | struct sockaddr_in addr; | |
3147 | struct iphdr *hdr; | |
272cd7a8 | 3148 | char *sp; |
e114e473 | 3149 | int rc; |
ecfcc53f | 3150 | struct smk_audit_info ad; |
e114e473 | 3151 | |
07feee8f PM |
3152 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
3153 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3154 | family = PF_INET; | |
e114e473 | 3155 | |
07feee8f PM |
3156 | netlbl_secattr_init(&secattr); |
3157 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 3158 | if (rc == 0) |
272cd7a8 | 3159 | sp = smack_from_secattr(&secattr, ssp); |
e114e473 | 3160 | else |
272cd7a8 | 3161 | sp = smack_known_huh.smk_known; |
07feee8f PM |
3162 | netlbl_secattr_destroy(&secattr); |
3163 | ||
ecfcc53f EB |
3164 | #ifdef CONFIG_AUDIT |
3165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
3166 | ad.a.u.net.family = family; | |
8964be4a | 3167 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
3168 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
3169 | #endif | |
e114e473 | 3170 | /* |
07feee8f PM |
3171 | * Receiving a packet requires that the other end be able to write |
3172 | * here. Read access is not required. | |
e114e473 | 3173 | */ |
272cd7a8 | 3174 | rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
3175 | if (rc != 0) |
3176 | return rc; | |
3177 | ||
3178 | /* | |
3179 | * Save the peer's label in the request_sock so we can later setup | |
3180 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
3181 | */ | |
272cd7a8 | 3182 | req->peer_secid = smack_to_secid(sp); |
07feee8f PM |
3183 | |
3184 | /* | |
3185 | * We need to decide if we want to label the incoming connection here | |
3186 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 3187 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
3188 | */ |
3189 | hdr = ip_hdr(skb); | |
3190 | addr.sin_addr.s_addr = hdr->saddr; | |
3191 | rcu_read_lock(); | |
3192 | if (smack_host_label(&addr) == NULL) { | |
3193 | rcu_read_unlock(); | |
3194 | netlbl_secattr_init(&secattr); | |
272cd7a8 | 3195 | smack_to_secattr(sp, &secattr); |
07feee8f PM |
3196 | rc = netlbl_req_setattr(req, &secattr); |
3197 | netlbl_secattr_destroy(&secattr); | |
3198 | } else { | |
3199 | rcu_read_unlock(); | |
3200 | netlbl_req_delattr(req); | |
3201 | } | |
e114e473 CS |
3202 | |
3203 | return rc; | |
3204 | } | |
3205 | ||
07feee8f PM |
3206 | /** |
3207 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
3208 | * @sk: the new socket | |
3209 | * @req: the connection's request_sock | |
3210 | * | |
3211 | * Transfer the connection's peer label to the newly created socket. | |
3212 | */ | |
3213 | static void smack_inet_csk_clone(struct sock *sk, | |
3214 | const struct request_sock *req) | |
3215 | { | |
3216 | struct socket_smack *ssp = sk->sk_security; | |
07feee8f | 3217 | |
272cd7a8 CS |
3218 | if (req->peer_secid != 0) |
3219 | ssp->smk_packet = smack_from_secid(req->peer_secid); | |
3220 | else | |
3221 | ssp->smk_packet = NULL; | |
07feee8f PM |
3222 | } |
3223 | ||
e114e473 CS |
3224 | /* |
3225 | * Key management security hooks | |
3226 | * | |
3227 | * Casey has not tested key support very heavily. | |
3228 | * The permission check is most likely too restrictive. | |
3229 | * If you care about keys please have a look. | |
3230 | */ | |
3231 | #ifdef CONFIG_KEYS | |
3232 | ||
3233 | /** | |
3234 | * smack_key_alloc - Set the key security blob | |
3235 | * @key: object | |
d84f4f99 | 3236 | * @cred: the credentials to use |
e114e473 CS |
3237 | * @flags: unused |
3238 | * | |
3239 | * No allocation required | |
3240 | * | |
3241 | * Returns 0 | |
3242 | */ | |
d84f4f99 | 3243 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
3244 | unsigned long flags) |
3245 | { | |
676dac4b | 3246 | key->security = smk_of_task(cred->security); |
e114e473 CS |
3247 | return 0; |
3248 | } | |
3249 | ||
3250 | /** | |
3251 | * smack_key_free - Clear the key security blob | |
3252 | * @key: the object | |
3253 | * | |
3254 | * Clear the blob pointer | |
3255 | */ | |
3256 | static void smack_key_free(struct key *key) | |
3257 | { | |
3258 | key->security = NULL; | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * smack_key_permission - Smack access on a key | |
3263 | * @key_ref: gets to the object | |
d84f4f99 | 3264 | * @cred: the credentials to use |
e114e473 CS |
3265 | * @perm: unused |
3266 | * | |
3267 | * Return 0 if the task has read and write to the object, | |
3268 | * an error code otherwise | |
3269 | */ | |
3270 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 3271 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
3272 | { |
3273 | struct key *keyp; | |
ecfcc53f | 3274 | struct smk_audit_info ad; |
676dac4b | 3275 | char *tsp = smk_of_task(cred->security); |
e114e473 CS |
3276 | |
3277 | keyp = key_ref_to_ptr(key_ref); | |
3278 | if (keyp == NULL) | |
3279 | return -EINVAL; | |
3280 | /* | |
3281 | * If the key hasn't been initialized give it access so that | |
3282 | * it may do so. | |
3283 | */ | |
3284 | if (keyp->security == NULL) | |
3285 | return 0; | |
3286 | /* | |
3287 | * This should not occur | |
3288 | */ | |
676dac4b | 3289 | if (tsp == NULL) |
e114e473 | 3290 | return -EACCES; |
ecfcc53f EB |
3291 | #ifdef CONFIG_AUDIT |
3292 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
3293 | ad.a.u.key_struct.key = keyp->serial; | |
3294 | ad.a.u.key_struct.key_desc = keyp->description; | |
3295 | #endif | |
676dac4b | 3296 | return smk_access(tsp, keyp->security, |
ecfcc53f | 3297 | MAY_READWRITE, &ad); |
e114e473 CS |
3298 | } |
3299 | #endif /* CONFIG_KEYS */ | |
3300 | ||
d20bdda6 AD |
3301 | /* |
3302 | * Smack Audit hooks | |
3303 | * | |
3304 | * Audit requires a unique representation of each Smack specific | |
3305 | * rule. This unique representation is used to distinguish the | |
3306 | * object to be audited from remaining kernel objects and also | |
3307 | * works as a glue between the audit hooks. | |
3308 | * | |
3309 | * Since repository entries are added but never deleted, we'll use | |
3310 | * the smack_known label address related to the given audit rule as | |
3311 | * the needed unique representation. This also better fits the smack | |
3312 | * model where nearly everything is a label. | |
3313 | */ | |
3314 | #ifdef CONFIG_AUDIT | |
3315 | ||
3316 | /** | |
3317 | * smack_audit_rule_init - Initialize a smack audit rule | |
3318 | * @field: audit rule fields given from user-space (audit.h) | |
3319 | * @op: required testing operator (=, !=, >, <, ...) | |
3320 | * @rulestr: smack label to be audited | |
3321 | * @vrule: pointer to save our own audit rule representation | |
3322 | * | |
3323 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
3324 | * The label to be audited is created if necessay. | |
3325 | */ | |
3326 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
3327 | { | |
3328 | char **rule = (char **)vrule; | |
3329 | *rule = NULL; | |
3330 | ||
3331 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3332 | return -EINVAL; | |
3333 | ||
5af75d8d | 3334 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
3335 | return -EINVAL; |
3336 | ||
3337 | *rule = smk_import(rulestr, 0); | |
3338 | ||
3339 | return 0; | |
3340 | } | |
3341 | ||
3342 | /** | |
3343 | * smack_audit_rule_known - Distinguish Smack audit rules | |
3344 | * @krule: rule of interest, in Audit kernel representation format | |
3345 | * | |
3346 | * This is used to filter Smack rules from remaining Audit ones. | |
3347 | * If it's proved that this rule belongs to us, the | |
3348 | * audit_rule_match hook will be called to do the final judgement. | |
3349 | */ | |
3350 | static int smack_audit_rule_known(struct audit_krule *krule) | |
3351 | { | |
3352 | struct audit_field *f; | |
3353 | int i; | |
3354 | ||
3355 | for (i = 0; i < krule->field_count; i++) { | |
3356 | f = &krule->fields[i]; | |
3357 | ||
3358 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
3359 | return 1; | |
3360 | } | |
3361 | ||
3362 | return 0; | |
3363 | } | |
3364 | ||
3365 | /** | |
3366 | * smack_audit_rule_match - Audit given object ? | |
3367 | * @secid: security id for identifying the object to test | |
3368 | * @field: audit rule flags given from user-space | |
3369 | * @op: required testing operator | |
3370 | * @vrule: smack internal rule presentation | |
3371 | * @actx: audit context associated with the check | |
3372 | * | |
3373 | * The core Audit hook. It's used to take the decision of | |
3374 | * whether to audit or not to audit a given object. | |
3375 | */ | |
3376 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
3377 | struct audit_context *actx) | |
3378 | { | |
3379 | char *smack; | |
3380 | char *rule = vrule; | |
3381 | ||
3382 | if (!rule) { | |
3383 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
3384 | "Smack: missing rule\n"); | |
3385 | return -ENOENT; | |
3386 | } | |
3387 | ||
3388 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
3389 | return 0; | |
3390 | ||
3391 | smack = smack_from_secid(secid); | |
3392 | ||
3393 | /* | |
3394 | * No need to do string comparisons. If a match occurs, | |
3395 | * both pointers will point to the same smack_known | |
3396 | * label. | |
3397 | */ | |
5af75d8d | 3398 | if (op == Audit_equal) |
d20bdda6 | 3399 | return (rule == smack); |
5af75d8d | 3400 | if (op == Audit_not_equal) |
d20bdda6 AD |
3401 | return (rule != smack); |
3402 | ||
3403 | return 0; | |
3404 | } | |
3405 | ||
3406 | /** | |
3407 | * smack_audit_rule_free - free smack rule representation | |
3408 | * @vrule: rule to be freed. | |
3409 | * | |
3410 | * No memory was allocated. | |
3411 | */ | |
3412 | static void smack_audit_rule_free(void *vrule) | |
3413 | { | |
3414 | /* No-op */ | |
3415 | } | |
3416 | ||
3417 | #endif /* CONFIG_AUDIT */ | |
3418 | ||
251a2a95 | 3419 | /** |
e114e473 CS |
3420 | * smack_secid_to_secctx - return the smack label for a secid |
3421 | * @secid: incoming integer | |
3422 | * @secdata: destination | |
3423 | * @seclen: how long it is | |
3424 | * | |
3425 | * Exists for networking code. | |
3426 | */ | |
3427 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3428 | { | |
3429 | char *sp = smack_from_secid(secid); | |
3430 | ||
d5630b9d EP |
3431 | if (secdata) |
3432 | *secdata = sp; | |
e114e473 CS |
3433 | *seclen = strlen(sp); |
3434 | return 0; | |
3435 | } | |
3436 | ||
251a2a95 | 3437 | /** |
4bc87e62 CS |
3438 | * smack_secctx_to_secid - return the secid for a smack label |
3439 | * @secdata: smack label | |
3440 | * @seclen: how long result is | |
3441 | * @secid: outgoing integer | |
3442 | * | |
3443 | * Exists for audit and networking code. | |
3444 | */ | |
e52c1764 | 3445 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3446 | { |
3447 | *secid = smack_to_secid(secdata); | |
3448 | return 0; | |
3449 | } | |
3450 | ||
251a2a95 | 3451 | /** |
e114e473 | 3452 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3453 | * @secdata: unused |
3454 | * @seclen: unused | |
e114e473 CS |
3455 | * |
3456 | * Exists to make sure nothing gets done, and properly | |
3457 | */ | |
3458 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3459 | { | |
3460 | } | |
3461 | ||
1ee65e37 DQ |
3462 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3463 | { | |
3464 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3465 | } | |
3466 | ||
3467 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3468 | { | |
3469 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3470 | } | |
3471 | ||
3472 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3473 | { | |
3474 | int len = 0; | |
3475 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3476 | ||
3477 | if (len < 0) | |
3478 | return len; | |
3479 | *ctxlen = len; | |
3480 | return 0; | |
3481 | } | |
3482 | ||
076c54c5 AD |
3483 | struct security_operations smack_ops = { |
3484 | .name = "smack", | |
3485 | ||
9e48858f | 3486 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3487 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3488 | .syslog = smack_syslog, |
e114e473 CS |
3489 | |
3490 | .sb_alloc_security = smack_sb_alloc_security, | |
3491 | .sb_free_security = smack_sb_free_security, | |
3492 | .sb_copy_data = smack_sb_copy_data, | |
3493 | .sb_kern_mount = smack_sb_kern_mount, | |
3494 | .sb_statfs = smack_sb_statfs, | |
3495 | .sb_mount = smack_sb_mount, | |
3496 | .sb_umount = smack_sb_umount, | |
3497 | ||
676dac4b | 3498 | .bprm_set_creds = smack_bprm_set_creds, |
84088ba2 JS |
3499 | .bprm_committing_creds = smack_bprm_committing_creds, |
3500 | .bprm_secureexec = smack_bprm_secureexec, | |
676dac4b | 3501 | |
e114e473 CS |
3502 | .inode_alloc_security = smack_inode_alloc_security, |
3503 | .inode_free_security = smack_inode_free_security, | |
3504 | .inode_init_security = smack_inode_init_security, | |
3505 | .inode_link = smack_inode_link, | |
3506 | .inode_unlink = smack_inode_unlink, | |
3507 | .inode_rmdir = smack_inode_rmdir, | |
3508 | .inode_rename = smack_inode_rename, | |
3509 | .inode_permission = smack_inode_permission, | |
3510 | .inode_setattr = smack_inode_setattr, | |
3511 | .inode_getattr = smack_inode_getattr, | |
3512 | .inode_setxattr = smack_inode_setxattr, | |
3513 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3514 | .inode_getxattr = smack_inode_getxattr, | |
3515 | .inode_removexattr = smack_inode_removexattr, | |
3516 | .inode_getsecurity = smack_inode_getsecurity, | |
3517 | .inode_setsecurity = smack_inode_setsecurity, | |
3518 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3519 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3520 | |
3521 | .file_permission = smack_file_permission, | |
3522 | .file_alloc_security = smack_file_alloc_security, | |
3523 | .file_free_security = smack_file_free_security, | |
3524 | .file_ioctl = smack_file_ioctl, | |
3525 | .file_lock = smack_file_lock, | |
3526 | .file_fcntl = smack_file_fcntl, | |
7898e1f8 | 3527 | .file_mmap = smack_file_mmap, |
e114e473 CS |
3528 | .file_set_fowner = smack_file_set_fowner, |
3529 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3530 | .file_receive = smack_file_receive, | |
3531 | ||
531f1d45 CS |
3532 | .dentry_open = smack_dentry_open, |
3533 | ||
ee18d64c | 3534 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3535 | .cred_free = smack_cred_free, |
d84f4f99 | 3536 | .cred_prepare = smack_cred_prepare, |
ee18d64c | 3537 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3538 | .kernel_act_as = smack_kernel_act_as, |
3539 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3540 | .task_setpgid = smack_task_setpgid, |
3541 | .task_getpgid = smack_task_getpgid, | |
3542 | .task_getsid = smack_task_getsid, | |
3543 | .task_getsecid = smack_task_getsecid, | |
3544 | .task_setnice = smack_task_setnice, | |
3545 | .task_setioprio = smack_task_setioprio, | |
3546 | .task_getioprio = smack_task_getioprio, | |
3547 | .task_setscheduler = smack_task_setscheduler, | |
3548 | .task_getscheduler = smack_task_getscheduler, | |
3549 | .task_movememory = smack_task_movememory, | |
3550 | .task_kill = smack_task_kill, | |
3551 | .task_wait = smack_task_wait, | |
e114e473 CS |
3552 | .task_to_inode = smack_task_to_inode, |
3553 | ||
3554 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3555 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3556 | |
3557 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3558 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3559 | ||
3560 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3561 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3562 | .msg_queue_associate = smack_msg_queue_associate, | |
3563 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3564 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3565 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3566 | ||
3567 | .shm_alloc_security = smack_shm_alloc_security, | |
3568 | .shm_free_security = smack_shm_free_security, | |
3569 | .shm_associate = smack_shm_associate, | |
3570 | .shm_shmctl = smack_shm_shmctl, | |
3571 | .shm_shmat = smack_shm_shmat, | |
3572 | ||
3573 | .sem_alloc_security = smack_sem_alloc_security, | |
3574 | .sem_free_security = smack_sem_free_security, | |
3575 | .sem_associate = smack_sem_associate, | |
3576 | .sem_semctl = smack_sem_semctl, | |
3577 | .sem_semop = smack_sem_semop, | |
3578 | ||
e114e473 CS |
3579 | .d_instantiate = smack_d_instantiate, |
3580 | ||
3581 | .getprocattr = smack_getprocattr, | |
3582 | .setprocattr = smack_setprocattr, | |
3583 | ||
3584 | .unix_stream_connect = smack_unix_stream_connect, | |
3585 | .unix_may_send = smack_unix_may_send, | |
3586 | ||
3587 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3588 | .socket_connect = smack_socket_connect, |
3589 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3590 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3591 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3592 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3593 | .sk_alloc_security = smack_sk_alloc_security, | |
3594 | .sk_free_security = smack_sk_free_security, | |
3595 | .sock_graft = smack_sock_graft, | |
3596 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3597 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3598 | |
e114e473 CS |
3599 | /* key management security hooks */ |
3600 | #ifdef CONFIG_KEYS | |
3601 | .key_alloc = smack_key_alloc, | |
3602 | .key_free = smack_key_free, | |
3603 | .key_permission = smack_key_permission, | |
3604 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3605 | |
3606 | /* Audit hooks */ | |
3607 | #ifdef CONFIG_AUDIT | |
3608 | .audit_rule_init = smack_audit_rule_init, | |
3609 | .audit_rule_known = smack_audit_rule_known, | |
3610 | .audit_rule_match = smack_audit_rule_match, | |
3611 | .audit_rule_free = smack_audit_rule_free, | |
3612 | #endif /* CONFIG_AUDIT */ | |
3613 | ||
e114e473 | 3614 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3615 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3616 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3617 | .inode_notifysecctx = smack_inode_notifysecctx, |
3618 | .inode_setsecctx = smack_inode_setsecctx, | |
3619 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3620 | }; |
3621 | ||
7198e2ee EB |
3622 | |
3623 | static __init void init_smack_know_list(void) | |
3624 | { | |
3625 | list_add(&smack_known_huh.list, &smack_known_list); | |
3626 | list_add(&smack_known_hat.list, &smack_known_list); | |
3627 | list_add(&smack_known_star.list, &smack_known_list); | |
3628 | list_add(&smack_known_floor.list, &smack_known_list); | |
3629 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3630 | list_add(&smack_known_web.list, &smack_known_list); | |
3631 | } | |
3632 | ||
e114e473 CS |
3633 | /** |
3634 | * smack_init - initialize the smack system | |
3635 | * | |
3636 | * Returns 0 | |
3637 | */ | |
3638 | static __init int smack_init(void) | |
3639 | { | |
d84f4f99 | 3640 | struct cred *cred; |
676dac4b | 3641 | struct task_smack *tsp; |
d84f4f99 | 3642 | |
7898e1f8 CS |
3643 | if (!security_module_enable(&smack_ops)) |
3644 | return 0; | |
3645 | ||
3646 | tsp = new_task_smack(smack_known_floor.smk_known, | |
3647 | smack_known_floor.smk_known, GFP_KERNEL); | |
676dac4b CS |
3648 | if (tsp == NULL) |
3649 | return -ENOMEM; | |
3650 | ||
e114e473 CS |
3651 | printk(KERN_INFO "Smack: Initializing.\n"); |
3652 | ||
3653 | /* | |
3654 | * Set the security state for the initial task. | |
3655 | */ | |
d84f4f99 | 3656 | cred = (struct cred *) current->cred; |
676dac4b | 3657 | cred->security = tsp; |
e114e473 | 3658 | |
421f91d2 | 3659 | /* initialize the smack_know_list */ |
7198e2ee | 3660 | init_smack_know_list(); |
e114e473 CS |
3661 | /* |
3662 | * Initialize locks | |
3663 | */ | |
e114e473 CS |
3664 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3665 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3666 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3667 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3668 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3669 | ||
3670 | /* | |
3671 | * Register with LSM | |
3672 | */ | |
3673 | if (register_security(&smack_ops)) | |
3674 | panic("smack: Unable to register with kernel.\n"); | |
3675 | ||
3676 | return 0; | |
3677 | } | |
3678 | ||
3679 | /* | |
3680 | * Smack requires early initialization in order to label | |
3681 | * all processes and objects when they are created. | |
3682 | */ | |
3683 | security_initcall(smack_init); |