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 | * | |
6 | * Author: | |
7 | * Casey Schaufler <casey@schaufler-ca.com> | |
8 | * | |
9 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f PM |
10 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
11 | * Paul Moore <paul.moore@hp.com> | |
e114e473 CS |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2, | |
15 | * as published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/xattr.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/mount.h> | |
21 | #include <linux/stat.h> | |
22 | #include <linux/ext2_fs.h> | |
23 | #include <linux/kd.h> | |
24 | #include <asm/ioctls.h> | |
07feee8f | 25 | #include <linux/ip.h> |
e114e473 CS |
26 | #include <linux/tcp.h> |
27 | #include <linux/udp.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/pipe_fs_i.h> | |
30 | #include <net/netlabel.h> | |
31 | #include <net/cipso_ipv4.h> | |
d20bdda6 | 32 | #include <linux/audit.h> |
1fd7317d | 33 | #include <linux/magic.h> |
e114e473 CS |
34 | #include "smack.h" |
35 | ||
c69e8d9c DH |
36 | #define task_security(task) (task_cred_xxx((task), security)) |
37 | ||
e114e473 CS |
38 | /** |
39 | * smk_fetch - Fetch the smack label from a file. | |
40 | * @ip: a pointer to the inode | |
41 | * @dp: a pointer to the dentry | |
42 | * | |
43 | * Returns a pointer to the master list entry for the Smack label | |
44 | * or NULL if there was no label to fetch. | |
45 | */ | |
46 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
47 | { | |
48 | int rc; | |
49 | char in[SMK_LABELLEN]; | |
50 | ||
51 | if (ip->i_op->getxattr == NULL) | |
52 | return NULL; | |
53 | ||
54 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
55 | if (rc < 0) | |
56 | return NULL; | |
57 | ||
58 | return smk_import(in, rc); | |
59 | } | |
60 | ||
61 | /** | |
62 | * new_inode_smack - allocate an inode security blob | |
63 | * @smack: a pointer to the Smack label to use in the blob | |
64 | * | |
65 | * Returns the new blob or NULL if there's no memory available | |
66 | */ | |
67 | struct inode_smack *new_inode_smack(char *smack) | |
68 | { | |
69 | struct inode_smack *isp; | |
70 | ||
71 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
72 | if (isp == NULL) | |
73 | return NULL; | |
74 | ||
75 | isp->smk_inode = smack; | |
76 | isp->smk_flags = 0; | |
77 | mutex_init(&isp->smk_lock); | |
78 | ||
79 | return isp; | |
80 | } | |
81 | ||
82 | /* | |
83 | * LSM hooks. | |
84 | * We he, that is fun! | |
85 | */ | |
86 | ||
87 | /** | |
9e48858f | 88 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 89 | * @ctp: child task pointer |
251a2a95 | 90 | * @mode: ptrace attachment mode |
e114e473 CS |
91 | * |
92 | * Returns 0 if access is OK, an error code otherwise | |
93 | * | |
94 | * Do the capability checks, and require read and write. | |
95 | */ | |
9e48858f | 96 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
97 | { |
98 | int rc; | |
ecfcc53f EB |
99 | struct smk_audit_info ad; |
100 | char *sp, *tsp; | |
e114e473 | 101 | |
9e48858f | 102 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
103 | if (rc != 0) |
104 | return rc; | |
105 | ||
ecfcc53f EB |
106 | sp = current_security(); |
107 | tsp = task_security(ctp); | |
108 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
109 | smk_ad_setfield_u_tsk(&ad, ctp); | |
110 | ||
111 | /* we won't log here, because rc can be overriden */ | |
112 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); | |
5cd9c58f | 113 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
114 | rc = 0; |
115 | ||
116 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); | |
5cd9c58f DH |
117 | return rc; |
118 | } | |
119 | ||
120 | /** | |
121 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
122 | * @ptp: parent task pointer | |
123 | * | |
124 | * Returns 0 if access is OK, an error code otherwise | |
125 | * | |
126 | * Do the capability checks, and require read and write. | |
127 | */ | |
128 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
129 | { | |
130 | int rc; | |
ecfcc53f EB |
131 | struct smk_audit_info ad; |
132 | char *sp, *tsp; | |
5cd9c58f DH |
133 | |
134 | rc = cap_ptrace_traceme(ptp); | |
135 | if (rc != 0) | |
136 | return rc; | |
e114e473 | 137 | |
ecfcc53f EB |
138 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
139 | smk_ad_setfield_u_tsk(&ad, ptp); | |
140 | ||
141 | sp = current_security(); | |
142 | tsp = task_security(ptp); | |
143 | /* we won't log here, because rc can be overriden */ | |
144 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); | |
5cd9c58f | 145 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
146 | rc = 0; |
147 | ||
148 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); | |
e114e473 CS |
149 | return rc; |
150 | } | |
151 | ||
152 | /** | |
153 | * smack_syslog - Smack approval on syslog | |
154 | * @type: message type | |
155 | * | |
156 | * Require that the task has the floor label | |
157 | * | |
158 | * Returns 0 on success, error code otherwise. | |
159 | */ | |
160 | static int smack_syslog(int type) | |
161 | { | |
162 | int rc; | |
86a264ab | 163 | char *sp = current_security(); |
e114e473 CS |
164 | |
165 | rc = cap_syslog(type); | |
166 | if (rc != 0) | |
167 | return rc; | |
168 | ||
169 | if (capable(CAP_MAC_OVERRIDE)) | |
170 | return 0; | |
171 | ||
172 | if (sp != smack_known_floor.smk_known) | |
173 | rc = -EACCES; | |
174 | ||
175 | return rc; | |
176 | } | |
177 | ||
178 | ||
179 | /* | |
180 | * Superblock Hooks. | |
181 | */ | |
182 | ||
183 | /** | |
184 | * smack_sb_alloc_security - allocate a superblock blob | |
185 | * @sb: the superblock getting the blob | |
186 | * | |
187 | * Returns 0 on success or -ENOMEM on error. | |
188 | */ | |
189 | static int smack_sb_alloc_security(struct super_block *sb) | |
190 | { | |
191 | struct superblock_smack *sbsp; | |
192 | ||
193 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
194 | ||
195 | if (sbsp == NULL) | |
196 | return -ENOMEM; | |
197 | ||
198 | sbsp->smk_root = smack_known_floor.smk_known; | |
199 | sbsp->smk_default = smack_known_floor.smk_known; | |
200 | sbsp->smk_floor = smack_known_floor.smk_known; | |
201 | sbsp->smk_hat = smack_known_hat.smk_known; | |
202 | sbsp->smk_initialized = 0; | |
203 | spin_lock_init(&sbsp->smk_sblock); | |
204 | ||
205 | sb->s_security = sbsp; | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /** | |
211 | * smack_sb_free_security - free a superblock blob | |
212 | * @sb: the superblock getting the blob | |
213 | * | |
214 | */ | |
215 | static void smack_sb_free_security(struct super_block *sb) | |
216 | { | |
217 | kfree(sb->s_security); | |
218 | sb->s_security = NULL; | |
219 | } | |
220 | ||
221 | /** | |
222 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 223 | * @orig: where to start |
251a2a95 | 224 | * @smackopts: mount options string |
e114e473 CS |
225 | * |
226 | * Returns 0 on success or -ENOMEM on error. | |
227 | * | |
228 | * Copy the Smack specific mount options out of the mount | |
229 | * options list. | |
230 | */ | |
e0007529 | 231 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
232 | { |
233 | char *cp, *commap, *otheropts, *dp; | |
234 | ||
e114e473 CS |
235 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
236 | if (otheropts == NULL) | |
237 | return -ENOMEM; | |
238 | ||
239 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
240 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
241 | dp = smackopts; | |
242 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
243 | dp = smackopts; | |
244 | else if (strstr(cp, SMK_FSHAT) == cp) | |
245 | dp = smackopts; | |
246 | else if (strstr(cp, SMK_FSROOT) == cp) | |
247 | dp = smackopts; | |
248 | else | |
249 | dp = otheropts; | |
250 | ||
251 | commap = strchr(cp, ','); | |
252 | if (commap != NULL) | |
253 | *commap = '\0'; | |
254 | ||
255 | if (*dp != '\0') | |
256 | strcat(dp, ","); | |
257 | strcat(dp, cp); | |
258 | } | |
259 | ||
260 | strcpy(orig, otheropts); | |
261 | free_page((unsigned long)otheropts); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | /** | |
267 | * smack_sb_kern_mount - Smack specific mount processing | |
268 | * @sb: the file system superblock | |
12204e24 | 269 | * @flags: the mount flags |
e114e473 CS |
270 | * @data: the smack mount options |
271 | * | |
272 | * Returns 0 on success, an error code on failure | |
273 | */ | |
12204e24 | 274 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
275 | { |
276 | struct dentry *root = sb->s_root; | |
277 | struct inode *inode = root->d_inode; | |
278 | struct superblock_smack *sp = sb->s_security; | |
279 | struct inode_smack *isp; | |
280 | char *op; | |
281 | char *commap; | |
282 | char *nsp; | |
283 | ||
284 | spin_lock(&sp->smk_sblock); | |
285 | if (sp->smk_initialized != 0) { | |
286 | spin_unlock(&sp->smk_sblock); | |
287 | return 0; | |
288 | } | |
289 | sp->smk_initialized = 1; | |
290 | spin_unlock(&sp->smk_sblock); | |
291 | ||
292 | for (op = data; op != NULL; op = commap) { | |
293 | commap = strchr(op, ','); | |
294 | if (commap != NULL) | |
295 | *commap++ = '\0'; | |
296 | ||
297 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
298 | op += strlen(SMK_FSHAT); | |
299 | nsp = smk_import(op, 0); | |
300 | if (nsp != NULL) | |
301 | sp->smk_hat = nsp; | |
302 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
303 | op += strlen(SMK_FSFLOOR); | |
304 | nsp = smk_import(op, 0); | |
305 | if (nsp != NULL) | |
306 | sp->smk_floor = nsp; | |
307 | } else if (strncmp(op, SMK_FSDEFAULT, | |
308 | strlen(SMK_FSDEFAULT)) == 0) { | |
309 | op += strlen(SMK_FSDEFAULT); | |
310 | nsp = smk_import(op, 0); | |
311 | if (nsp != NULL) | |
312 | sp->smk_default = nsp; | |
313 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
314 | op += strlen(SMK_FSROOT); | |
315 | nsp = smk_import(op, 0); | |
316 | if (nsp != NULL) | |
317 | sp->smk_root = nsp; | |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
322 | * Initialize the root inode. | |
323 | */ | |
324 | isp = inode->i_security; | |
325 | if (isp == NULL) | |
326 | inode->i_security = new_inode_smack(sp->smk_root); | |
327 | else | |
328 | isp->smk_inode = sp->smk_root; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /** | |
334 | * smack_sb_statfs - Smack check on statfs | |
335 | * @dentry: identifies the file system in question | |
336 | * | |
337 | * Returns 0 if current can read the floor of the filesystem, | |
338 | * and error code otherwise | |
339 | */ | |
340 | static int smack_sb_statfs(struct dentry *dentry) | |
341 | { | |
342 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
343 | int rc; |
344 | struct smk_audit_info ad; | |
345 | ||
346 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
347 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 348 | |
ecfcc53f EB |
349 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
350 | return rc; | |
e114e473 CS |
351 | } |
352 | ||
353 | /** | |
354 | * smack_sb_mount - Smack check for mounting | |
355 | * @dev_name: unused | |
251a2a95 | 356 | * @path: mount point |
e114e473 CS |
357 | * @type: unused |
358 | * @flags: unused | |
359 | * @data: unused | |
360 | * | |
361 | * Returns 0 if current can write the floor of the filesystem | |
362 | * being mounted on, an error code otherwise. | |
363 | */ | |
b5266eb4 | 364 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
365 | char *type, unsigned long flags, void *data) |
366 | { | |
b5266eb4 | 367 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 368 | struct smk_audit_info ad; |
e114e473 | 369 | |
ecfcc53f EB |
370 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
371 | smk_ad_setfield_u_fs_path(&ad, *path); | |
372 | ||
373 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
374 | } |
375 | ||
376 | /** | |
377 | * smack_sb_umount - Smack check for unmounting | |
378 | * @mnt: file system to unmount | |
379 | * @flags: unused | |
380 | * | |
381 | * Returns 0 if current can write the floor of the filesystem | |
382 | * being unmounted, an error code otherwise. | |
383 | */ | |
384 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
385 | { | |
386 | struct superblock_smack *sbp; | |
ecfcc53f | 387 | struct smk_audit_info ad; |
e114e473 | 388 | |
ecfcc53f EB |
389 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
390 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_mountpoint); | |
391 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
e114e473 | 392 | |
ecfcc53f EB |
393 | sbp = mnt->mnt_sb->s_security; |
394 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
395 | } |
396 | ||
397 | /* | |
398 | * Inode hooks | |
399 | */ | |
400 | ||
401 | /** | |
402 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 403 | * @inode: the inode in need of a blob |
e114e473 CS |
404 | * |
405 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
406 | */ | |
407 | static int smack_inode_alloc_security(struct inode *inode) | |
408 | { | |
86a264ab | 409 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
410 | if (inode->i_security == NULL) |
411 | return -ENOMEM; | |
412 | return 0; | |
413 | } | |
414 | ||
415 | /** | |
416 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 417 | * @inode: the inode with a blob |
e114e473 CS |
418 | * |
419 | * Clears the blob pointer in inode | |
420 | */ | |
421 | static void smack_inode_free_security(struct inode *inode) | |
422 | { | |
423 | kfree(inode->i_security); | |
424 | inode->i_security = NULL; | |
425 | } | |
426 | ||
427 | /** | |
428 | * smack_inode_init_security - copy out the smack from an inode | |
429 | * @inode: the inode | |
430 | * @dir: unused | |
431 | * @name: where to put the attribute name | |
432 | * @value: where to put the attribute value | |
433 | * @len: where to put the length of the attribute | |
434 | * | |
435 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
436 | */ | |
437 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
438 | char **name, void **value, size_t *len) | |
439 | { | |
440 | char *isp = smk_of_inode(inode); | |
441 | ||
442 | if (name) { | |
443 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
444 | if (*name == NULL) | |
445 | return -ENOMEM; | |
446 | } | |
447 | ||
448 | if (value) { | |
449 | *value = kstrdup(isp, GFP_KERNEL); | |
450 | if (*value == NULL) | |
451 | return -ENOMEM; | |
452 | } | |
453 | ||
454 | if (len) | |
455 | *len = strlen(isp) + 1; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | /** | |
461 | * smack_inode_link - Smack check on link | |
462 | * @old_dentry: the existing object | |
463 | * @dir: unused | |
464 | * @new_dentry: the new object | |
465 | * | |
466 | * Returns 0 if access is permitted, an error code otherwise | |
467 | */ | |
468 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
469 | struct dentry *new_dentry) | |
470 | { | |
e114e473 | 471 | char *isp; |
ecfcc53f EB |
472 | struct smk_audit_info ad; |
473 | int rc; | |
474 | ||
475 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
476 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
477 | |
478 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 479 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
480 | |
481 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
482 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
483 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
484 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
485 | } |
486 | ||
487 | return rc; | |
488 | } | |
489 | ||
490 | /** | |
491 | * smack_inode_unlink - Smack check on inode deletion | |
492 | * @dir: containing directory object | |
493 | * @dentry: file to unlink | |
494 | * | |
495 | * Returns 0 if current can write the containing directory | |
496 | * and the object, error code otherwise | |
497 | */ | |
498 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
499 | { | |
500 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 501 | struct smk_audit_info ad; |
e114e473 CS |
502 | int rc; |
503 | ||
ecfcc53f EB |
504 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
505 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
506 | ||
e114e473 CS |
507 | /* |
508 | * You need write access to the thing you're unlinking | |
509 | */ | |
ecfcc53f EB |
510 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
511 | if (rc == 0) { | |
e114e473 CS |
512 | /* |
513 | * You also need write access to the containing directory | |
514 | */ | |
ecfcc53f EB |
515 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
516 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
517 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
518 | } | |
e114e473 CS |
519 | return rc; |
520 | } | |
521 | ||
522 | /** | |
523 | * smack_inode_rmdir - Smack check on directory deletion | |
524 | * @dir: containing directory object | |
525 | * @dentry: directory to unlink | |
526 | * | |
527 | * Returns 0 if current can write the containing directory | |
528 | * and the directory, error code otherwise | |
529 | */ | |
530 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
531 | { | |
ecfcc53f | 532 | struct smk_audit_info ad; |
e114e473 CS |
533 | int rc; |
534 | ||
ecfcc53f EB |
535 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
536 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
537 | ||
e114e473 CS |
538 | /* |
539 | * You need write access to the thing you're removing | |
540 | */ | |
ecfcc53f EB |
541 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
542 | if (rc == 0) { | |
e114e473 CS |
543 | /* |
544 | * You also need write access to the containing directory | |
545 | */ | |
ecfcc53f EB |
546 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
547 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
548 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
549 | } | |
e114e473 CS |
550 | |
551 | return rc; | |
552 | } | |
553 | ||
554 | /** | |
555 | * smack_inode_rename - Smack check on rename | |
556 | * @old_inode: the old directory | |
557 | * @old_dentry: unused | |
558 | * @new_inode: the new directory | |
559 | * @new_dentry: unused | |
560 | * | |
561 | * Read and write access is required on both the old and | |
562 | * new directories. | |
563 | * | |
564 | * Returns 0 if access is permitted, an error code otherwise | |
565 | */ | |
566 | static int smack_inode_rename(struct inode *old_inode, | |
567 | struct dentry *old_dentry, | |
568 | struct inode *new_inode, | |
569 | struct dentry *new_dentry) | |
570 | { | |
571 | int rc; | |
572 | char *isp; | |
ecfcc53f EB |
573 | struct smk_audit_info ad; |
574 | ||
575 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
576 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
577 | |
578 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 579 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
580 | |
581 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
582 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
583 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
584 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 585 | } |
e114e473 CS |
586 | return rc; |
587 | } | |
588 | ||
589 | /** | |
590 | * smack_inode_permission - Smack version of permission() | |
591 | * @inode: the inode in question | |
592 | * @mask: the access requested | |
e114e473 CS |
593 | * |
594 | * This is the important Smack hook. | |
595 | * | |
596 | * Returns 0 if access is permitted, -EACCES otherwise | |
597 | */ | |
b77b0646 | 598 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 599 | { |
ecfcc53f | 600 | struct smk_audit_info ad; |
e114e473 CS |
601 | /* |
602 | * No permission to check. Existence test. Yup, it's there. | |
603 | */ | |
604 | if (mask == 0) | |
605 | return 0; | |
ecfcc53f EB |
606 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
607 | smk_ad_setfield_u_fs_inode(&ad, inode); | |
608 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
609 | } |
610 | ||
611 | /** | |
612 | * smack_inode_setattr - Smack check for setting attributes | |
613 | * @dentry: the object | |
614 | * @iattr: for the force flag | |
615 | * | |
616 | * Returns 0 if access is permitted, an error code otherwise | |
617 | */ | |
618 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
619 | { | |
ecfcc53f | 620 | struct smk_audit_info ad; |
e114e473 CS |
621 | /* |
622 | * Need to allow for clearing the setuid bit. | |
623 | */ | |
624 | if (iattr->ia_valid & ATTR_FORCE) | |
625 | return 0; | |
ecfcc53f EB |
626 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
627 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 628 | |
ecfcc53f | 629 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
630 | } |
631 | ||
632 | /** | |
633 | * smack_inode_getattr - Smack check for getting attributes | |
634 | * @mnt: unused | |
635 | * @dentry: the object | |
636 | * | |
637 | * Returns 0 if access is permitted, an error code otherwise | |
638 | */ | |
639 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
640 | { | |
ecfcc53f EB |
641 | struct smk_audit_info ad; |
642 | ||
643 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
644 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
645 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
646 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
647 | } |
648 | ||
649 | /** | |
650 | * smack_inode_setxattr - Smack check for setting xattrs | |
651 | * @dentry: the object | |
652 | * @name: name of the attribute | |
653 | * @value: unused | |
654 | * @size: unused | |
655 | * @flags: unused | |
656 | * | |
657 | * This protects the Smack attribute explicitly. | |
658 | * | |
659 | * Returns 0 if access is permitted, an error code otherwise | |
660 | */ | |
8f0cfa52 DH |
661 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
662 | const void *value, size_t size, int flags) | |
e114e473 | 663 | { |
ecfcc53f | 664 | struct smk_audit_info ad; |
bcdca225 | 665 | int rc = 0; |
e114e473 | 666 | |
bcdca225 CS |
667 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
668 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
669 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
670 | if (!capable(CAP_MAC_ADMIN)) | |
671 | rc = -EPERM; | |
defc433b EB |
672 | /* |
673 | * check label validity here so import wont fail on | |
674 | * post_setxattr | |
675 | */ | |
676 | if (size == 0 || size >= SMK_LABELLEN || | |
677 | smk_import(value, size) == NULL) | |
4303154e | 678 | rc = -EINVAL; |
bcdca225 CS |
679 | } else |
680 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
681 | ||
ecfcc53f EB |
682 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
683 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
684 | ||
bcdca225 | 685 | if (rc == 0) |
ecfcc53f | 686 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
687 | |
688 | return rc; | |
e114e473 CS |
689 | } |
690 | ||
691 | /** | |
692 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
693 | * @dentry: object | |
694 | * @name: attribute name | |
695 | * @value: attribute value | |
696 | * @size: attribute size | |
697 | * @flags: unused | |
698 | * | |
699 | * Set the pointer in the inode blob to the entry found | |
700 | * in the master label list. | |
701 | */ | |
8f0cfa52 DH |
702 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
703 | const void *value, size_t size, int flags) | |
e114e473 CS |
704 | { |
705 | struct inode_smack *isp; | |
706 | char *nsp; | |
707 | ||
708 | /* | |
709 | * Not SMACK | |
710 | */ | |
711 | if (strcmp(name, XATTR_NAME_SMACK)) | |
712 | return; | |
713 | ||
e114e473 CS |
714 | isp = dentry->d_inode->i_security; |
715 | ||
716 | /* | |
717 | * No locking is done here. This is a pointer | |
718 | * assignment. | |
719 | */ | |
720 | nsp = smk_import(value, size); | |
721 | if (nsp != NULL) | |
722 | isp->smk_inode = nsp; | |
723 | else | |
724 | isp->smk_inode = smack_known_invalid.smk_known; | |
725 | ||
726 | return; | |
727 | } | |
728 | ||
729 | /* | |
730 | * smack_inode_getxattr - Smack check on getxattr | |
731 | * @dentry: the object | |
732 | * @name: unused | |
733 | * | |
734 | * Returns 0 if access is permitted, an error code otherwise | |
735 | */ | |
8f0cfa52 | 736 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 737 | { |
ecfcc53f EB |
738 | struct smk_audit_info ad; |
739 | ||
740 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
741 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
742 | ||
743 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
744 | } |
745 | ||
746 | /* | |
747 | * smack_inode_removexattr - Smack check on removexattr | |
748 | * @dentry: the object | |
749 | * @name: name of the attribute | |
750 | * | |
751 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
752 | * | |
753 | * Returns 0 if access is permitted, an error code otherwise | |
754 | */ | |
8f0cfa52 | 755 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 756 | { |
ecfcc53f | 757 | struct smk_audit_info ad; |
bcdca225 | 758 | int rc = 0; |
e114e473 | 759 | |
bcdca225 CS |
760 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
761 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
762 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
763 | if (!capable(CAP_MAC_ADMIN)) | |
764 | rc = -EPERM; | |
765 | } else | |
766 | rc = cap_inode_removexattr(dentry, name); | |
767 | ||
ecfcc53f EB |
768 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
769 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
bcdca225 | 770 | if (rc == 0) |
ecfcc53f | 771 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
772 | |
773 | return rc; | |
e114e473 CS |
774 | } |
775 | ||
776 | /** | |
777 | * smack_inode_getsecurity - get smack xattrs | |
778 | * @inode: the object | |
779 | * @name: attribute name | |
780 | * @buffer: where to put the result | |
251a2a95 | 781 | * @alloc: unused |
e114e473 CS |
782 | * |
783 | * Returns the size of the attribute or an error code | |
784 | */ | |
785 | static int smack_inode_getsecurity(const struct inode *inode, | |
786 | const char *name, void **buffer, | |
787 | bool alloc) | |
788 | { | |
789 | struct socket_smack *ssp; | |
790 | struct socket *sock; | |
791 | struct super_block *sbp; | |
792 | struct inode *ip = (struct inode *)inode; | |
793 | char *isp; | |
794 | int ilen; | |
795 | int rc = 0; | |
796 | ||
797 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
798 | isp = smk_of_inode(inode); | |
799 | ilen = strlen(isp) + 1; | |
800 | *buffer = isp; | |
801 | return ilen; | |
802 | } | |
803 | ||
804 | /* | |
805 | * The rest of the Smack xattrs are only on sockets. | |
806 | */ | |
807 | sbp = ip->i_sb; | |
808 | if (sbp->s_magic != SOCKFS_MAGIC) | |
809 | return -EOPNOTSUPP; | |
810 | ||
811 | sock = SOCKET_I(ip); | |
2e1d146a | 812 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
813 | return -EOPNOTSUPP; |
814 | ||
815 | ssp = sock->sk->sk_security; | |
816 | ||
817 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
818 | isp = ssp->smk_in; | |
819 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
820 | isp = ssp->smk_out; | |
821 | else | |
822 | return -EOPNOTSUPP; | |
823 | ||
824 | ilen = strlen(isp) + 1; | |
825 | if (rc == 0) { | |
826 | *buffer = isp; | |
827 | rc = ilen; | |
828 | } | |
829 | ||
830 | return rc; | |
831 | } | |
832 | ||
833 | ||
834 | /** | |
835 | * smack_inode_listsecurity - list the Smack attributes | |
836 | * @inode: the object | |
837 | * @buffer: where they go | |
838 | * @buffer_size: size of buffer | |
839 | * | |
840 | * Returns 0 on success, -EINVAL otherwise | |
841 | */ | |
842 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
843 | size_t buffer_size) | |
844 | { | |
845 | int len = strlen(XATTR_NAME_SMACK); | |
846 | ||
847 | if (buffer != NULL && len <= buffer_size) { | |
848 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
849 | return len; | |
850 | } | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
d20bdda6 AD |
854 | /** |
855 | * smack_inode_getsecid - Extract inode's security id | |
856 | * @inode: inode to extract the info from | |
857 | * @secid: where result will be saved | |
858 | */ | |
859 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
860 | { | |
861 | struct inode_smack *isp = inode->i_security; | |
862 | ||
863 | *secid = smack_to_secid(isp->smk_inode); | |
864 | } | |
865 | ||
e114e473 CS |
866 | /* |
867 | * File Hooks | |
868 | */ | |
869 | ||
870 | /** | |
871 | * smack_file_permission - Smack check on file operations | |
872 | * @file: unused | |
873 | * @mask: unused | |
874 | * | |
875 | * Returns 0 | |
876 | * | |
877 | * Should access checks be done on each read or write? | |
878 | * UNICOS and SELinux say yes. | |
879 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
880 | * | |
881 | * I'll say no for now. Smack does not do the frequent | |
882 | * label changing that SELinux does. | |
883 | */ | |
884 | static int smack_file_permission(struct file *file, int mask) | |
885 | { | |
886 | return 0; | |
887 | } | |
888 | ||
889 | /** | |
890 | * smack_file_alloc_security - assign a file security blob | |
891 | * @file: the object | |
892 | * | |
893 | * The security blob for a file is a pointer to the master | |
894 | * label list, so no allocation is done. | |
895 | * | |
896 | * Returns 0 | |
897 | */ | |
898 | static int smack_file_alloc_security(struct file *file) | |
899 | { | |
86a264ab | 900 | file->f_security = current_security(); |
e114e473 CS |
901 | return 0; |
902 | } | |
903 | ||
904 | /** | |
905 | * smack_file_free_security - clear a file security blob | |
906 | * @file: the object | |
907 | * | |
908 | * The security blob for a file is a pointer to the master | |
909 | * label list, so no memory is freed. | |
910 | */ | |
911 | static void smack_file_free_security(struct file *file) | |
912 | { | |
913 | file->f_security = NULL; | |
914 | } | |
915 | ||
916 | /** | |
917 | * smack_file_ioctl - Smack check on ioctls | |
918 | * @file: the object | |
919 | * @cmd: what to do | |
920 | * @arg: unused | |
921 | * | |
922 | * Relies heavily on the correct use of the ioctl command conventions. | |
923 | * | |
924 | * Returns 0 if allowed, error code otherwise | |
925 | */ | |
926 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
927 | unsigned long arg) | |
928 | { | |
929 | int rc = 0; | |
ecfcc53f EB |
930 | struct smk_audit_info ad; |
931 | ||
932 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
933 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
934 | |
935 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 936 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
937 | |
938 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 939 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
940 | |
941 | return rc; | |
942 | } | |
943 | ||
944 | /** | |
945 | * smack_file_lock - Smack check on file locking | |
946 | * @file: the object | |
251a2a95 | 947 | * @cmd: unused |
e114e473 CS |
948 | * |
949 | * Returns 0 if current has write access, error code otherwise | |
950 | */ | |
951 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
952 | { | |
ecfcc53f EB |
953 | struct smk_audit_info ad; |
954 | ||
955 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
956 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); | |
957 | return smk_curacc(file->f_security, MAY_WRITE, &ad); | |
e114e473 CS |
958 | } |
959 | ||
960 | /** | |
961 | * smack_file_fcntl - Smack check on fcntl | |
962 | * @file: the object | |
963 | * @cmd: what action to check | |
964 | * @arg: unused | |
965 | * | |
966 | * Returns 0 if current has access, error code otherwise | |
967 | */ | |
968 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
969 | unsigned long arg) | |
970 | { | |
ecfcc53f | 971 | struct smk_audit_info ad; |
e114e473 CS |
972 | int rc; |
973 | ||
ecfcc53f EB |
974 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
975 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
976 | ||
e114e473 CS |
977 | switch (cmd) { |
978 | case F_DUPFD: | |
979 | case F_GETFD: | |
980 | case F_GETFL: | |
981 | case F_GETLK: | |
982 | case F_GETOWN: | |
983 | case F_GETSIG: | |
ecfcc53f | 984 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
985 | break; |
986 | case F_SETFD: | |
987 | case F_SETFL: | |
988 | case F_SETLK: | |
989 | case F_SETLKW: | |
990 | case F_SETOWN: | |
991 | case F_SETSIG: | |
ecfcc53f | 992 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
993 | break; |
994 | default: | |
ecfcc53f | 995 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
e114e473 CS |
996 | } |
997 | ||
998 | return rc; | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * smack_file_set_fowner - set the file security blob value | |
1003 | * @file: object in question | |
1004 | * | |
1005 | * Returns 0 | |
1006 | * Further research may be required on this one. | |
1007 | */ | |
1008 | static int smack_file_set_fowner(struct file *file) | |
1009 | { | |
86a264ab | 1010 | file->f_security = current_security(); |
e114e473 CS |
1011 | return 0; |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * smack_file_send_sigiotask - Smack on sigio | |
1016 | * @tsk: The target task | |
1017 | * @fown: the object the signal come from | |
1018 | * @signum: unused | |
1019 | * | |
1020 | * Allow a privileged task to get signals even if it shouldn't | |
1021 | * | |
1022 | * Returns 0 if a subject with the object's smack could | |
1023 | * write to the task, an error code otherwise. | |
1024 | */ | |
1025 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1026 | struct fown_struct *fown, int signum) | |
1027 | { | |
1028 | struct file *file; | |
1029 | int rc; | |
ecfcc53f EB |
1030 | char *tsp = tsk->cred->security; |
1031 | struct smk_audit_info ad; | |
e114e473 CS |
1032 | |
1033 | /* | |
1034 | * struct fown_struct is never outside the context of a struct file | |
1035 | */ | |
1036 | file = container_of(fown, struct file, f_owner); | |
ecfcc53f EB |
1037 | /* we don't log here as rc can be overriden */ |
1038 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1039 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1040 | rc = 0; |
1041 | ||
1042 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1043 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1044 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1045 | return rc; |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * smack_file_receive - Smack file receive check | |
1050 | * @file: the object | |
1051 | * | |
1052 | * Returns 0 if current has access, error code otherwise | |
1053 | */ | |
1054 | static int smack_file_receive(struct file *file) | |
1055 | { | |
1056 | int may = 0; | |
ecfcc53f | 1057 | struct smk_audit_info ad; |
e114e473 | 1058 | |
ecfcc53f EB |
1059 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1060 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1061 | /* |
1062 | * This code relies on bitmasks. | |
1063 | */ | |
1064 | if (file->f_mode & FMODE_READ) | |
1065 | may = MAY_READ; | |
1066 | if (file->f_mode & FMODE_WRITE) | |
1067 | may |= MAY_WRITE; | |
1068 | ||
ecfcc53f | 1069 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1070 | } |
1071 | ||
1072 | /* | |
1073 | * Task hooks | |
1074 | */ | |
1075 | ||
ee18d64c DH |
1076 | /** |
1077 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1078 | * @new: the new credentials | |
1079 | * @gfp: the atomicity of any memory allocations | |
1080 | * | |
1081 | * Prepare a blank set of credentials for modification. This must allocate all | |
1082 | * the memory the LSM module might require such that cred_transfer() can | |
1083 | * complete without error. | |
1084 | */ | |
1085 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1086 | { | |
1087 | cred->security = NULL; | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | ||
e114e473 | 1092 | /** |
f1752eec DH |
1093 | * smack_cred_free - "free" task-level security credentials |
1094 | * @cred: the credentials in question | |
e114e473 CS |
1095 | * |
1096 | * Smack isn't using copies of blobs. Everyone | |
1097 | * points to an immutable list. The blobs never go away. | |
1098 | * There is no leak here. | |
1099 | */ | |
f1752eec | 1100 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1101 | { |
f1752eec | 1102 | cred->security = NULL; |
e114e473 CS |
1103 | } |
1104 | ||
d84f4f99 DH |
1105 | /** |
1106 | * smack_cred_prepare - prepare new set of credentials for modification | |
1107 | * @new: the new credentials | |
1108 | * @old: the original credentials | |
1109 | * @gfp: the atomicity of any memory allocations | |
1110 | * | |
1111 | * Prepare a new set of credentials for modification. | |
1112 | */ | |
1113 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1114 | gfp_t gfp) | |
1115 | { | |
1116 | new->security = old->security; | |
1117 | return 0; | |
1118 | } | |
1119 | ||
251a2a95 RD |
1120 | /** |
1121 | * smack_cred_commit - commit new credentials | |
d84f4f99 DH |
1122 | * @new: the new credentials |
1123 | * @old: the original credentials | |
1124 | */ | |
1125 | static void smack_cred_commit(struct cred *new, const struct cred *old) | |
1126 | { | |
1127 | } | |
1128 | ||
ee18d64c DH |
1129 | /** |
1130 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
1131 | * @new: the new credentials | |
1132 | * @old: the original credentials | |
1133 | * | |
1134 | * Fill in a set of blank credentials from another set of credentials. | |
1135 | */ | |
1136 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
1137 | { | |
1138 | new->security = old->security; | |
1139 | } | |
1140 | ||
3a3b7ce9 DH |
1141 | /** |
1142 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1143 | * @new: points to the set of credentials to be modified. |
1144 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1145 | * |
1146 | * Set the security data for a kernel service. | |
1147 | */ | |
1148 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1149 | { | |
1150 | char *smack = smack_from_secid(secid); | |
1151 | ||
1152 | if (smack == NULL) | |
1153 | return -EINVAL; | |
1154 | ||
1155 | new->security = smack; | |
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1161 | * @new: points to the set of credentials to be modified |
1162 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1163 | * |
1164 | * Set the file creation context in a set of credentials to the same | |
1165 | * as the objective context of the specified inode | |
1166 | */ | |
1167 | static int smack_kernel_create_files_as(struct cred *new, | |
1168 | struct inode *inode) | |
1169 | { | |
1170 | struct inode_smack *isp = inode->i_security; | |
1171 | ||
1172 | new->security = isp->smk_inode; | |
1173 | return 0; | |
1174 | } | |
1175 | ||
ecfcc53f EB |
1176 | /** |
1177 | * smk_curacc_on_task - helper to log task related access | |
1178 | * @p: the task object | |
1179 | * @access : the access requested | |
1180 | * | |
1181 | * Return 0 if access is permitted | |
1182 | */ | |
1183 | static int smk_curacc_on_task(struct task_struct *p, int access) | |
1184 | { | |
1185 | struct smk_audit_info ad; | |
1186 | ||
1187 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1188 | smk_ad_setfield_u_tsk(&ad, p); | |
1189 | return smk_curacc(task_security(p), access, &ad); | |
1190 | } | |
1191 | ||
e114e473 CS |
1192 | /** |
1193 | * smack_task_setpgid - Smack check on setting pgid | |
1194 | * @p: the task object | |
1195 | * @pgid: unused | |
1196 | * | |
1197 | * Return 0 if write access is permitted | |
1198 | */ | |
1199 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1200 | { | |
ecfcc53f | 1201 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1202 | } |
1203 | ||
1204 | /** | |
1205 | * smack_task_getpgid - Smack access check for getpgid | |
1206 | * @p: the object task | |
1207 | * | |
1208 | * Returns 0 if current can read the object task, error code otherwise | |
1209 | */ | |
1210 | static int smack_task_getpgid(struct task_struct *p) | |
1211 | { | |
ecfcc53f | 1212 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1213 | } |
1214 | ||
1215 | /** | |
1216 | * smack_task_getsid - Smack access check for getsid | |
1217 | * @p: the object task | |
1218 | * | |
1219 | * Returns 0 if current can read the object task, error code otherwise | |
1220 | */ | |
1221 | static int smack_task_getsid(struct task_struct *p) | |
1222 | { | |
ecfcc53f | 1223 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1224 | } |
1225 | ||
1226 | /** | |
1227 | * smack_task_getsecid - get the secid of the task | |
1228 | * @p: the object task | |
1229 | * @secid: where to put the result | |
1230 | * | |
1231 | * Sets the secid to contain a u32 version of the smack label. | |
1232 | */ | |
1233 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1234 | { | |
c69e8d9c | 1235 | *secid = smack_to_secid(task_security(p)); |
e114e473 CS |
1236 | } |
1237 | ||
1238 | /** | |
1239 | * smack_task_setnice - Smack check on setting nice | |
1240 | * @p: the task object | |
1241 | * @nice: unused | |
1242 | * | |
1243 | * Return 0 if write access is permitted | |
1244 | */ | |
1245 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1246 | { | |
bcdca225 CS |
1247 | int rc; |
1248 | ||
1249 | rc = cap_task_setnice(p, nice); | |
1250 | if (rc == 0) | |
ecfcc53f | 1251 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1252 | return rc; |
e114e473 CS |
1253 | } |
1254 | ||
1255 | /** | |
1256 | * smack_task_setioprio - Smack check on setting ioprio | |
1257 | * @p: the task object | |
1258 | * @ioprio: unused | |
1259 | * | |
1260 | * Return 0 if write access is permitted | |
1261 | */ | |
1262 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1263 | { | |
bcdca225 CS |
1264 | int rc; |
1265 | ||
1266 | rc = cap_task_setioprio(p, ioprio); | |
1267 | if (rc == 0) | |
ecfcc53f | 1268 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1269 | return rc; |
e114e473 CS |
1270 | } |
1271 | ||
1272 | /** | |
1273 | * smack_task_getioprio - Smack check on reading ioprio | |
1274 | * @p: the task object | |
1275 | * | |
1276 | * Return 0 if read access is permitted | |
1277 | */ | |
1278 | static int smack_task_getioprio(struct task_struct *p) | |
1279 | { | |
ecfcc53f | 1280 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1281 | } |
1282 | ||
1283 | /** | |
1284 | * smack_task_setscheduler - Smack check on setting scheduler | |
1285 | * @p: the task object | |
1286 | * @policy: unused | |
1287 | * @lp: unused | |
1288 | * | |
1289 | * Return 0 if read access is permitted | |
1290 | */ | |
1291 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1292 | struct sched_param *lp) | |
1293 | { | |
bcdca225 CS |
1294 | int rc; |
1295 | ||
1296 | rc = cap_task_setscheduler(p, policy, lp); | |
1297 | if (rc == 0) | |
ecfcc53f | 1298 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1299 | return rc; |
e114e473 CS |
1300 | } |
1301 | ||
1302 | /** | |
1303 | * smack_task_getscheduler - Smack check on reading scheduler | |
1304 | * @p: the task object | |
1305 | * | |
1306 | * Return 0 if read access is permitted | |
1307 | */ | |
1308 | static int smack_task_getscheduler(struct task_struct *p) | |
1309 | { | |
ecfcc53f | 1310 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1311 | } |
1312 | ||
1313 | /** | |
1314 | * smack_task_movememory - Smack check on moving memory | |
1315 | * @p: the task object | |
1316 | * | |
1317 | * Return 0 if write access is permitted | |
1318 | */ | |
1319 | static int smack_task_movememory(struct task_struct *p) | |
1320 | { | |
ecfcc53f | 1321 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1322 | } |
1323 | ||
1324 | /** | |
1325 | * smack_task_kill - Smack check on signal delivery | |
1326 | * @p: the task object | |
1327 | * @info: unused | |
1328 | * @sig: unused | |
1329 | * @secid: identifies the smack to use in lieu of current's | |
1330 | * | |
1331 | * Return 0 if write access is permitted | |
1332 | * | |
1333 | * The secid behavior is an artifact of an SELinux hack | |
1334 | * in the USB code. Someday it may go away. | |
1335 | */ | |
1336 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1337 | int sig, u32 secid) | |
1338 | { | |
ecfcc53f EB |
1339 | struct smk_audit_info ad; |
1340 | ||
1341 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1342 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1343 | /* |
1344 | * Sending a signal requires that the sender | |
1345 | * can write the receiver. | |
1346 | */ | |
1347 | if (secid == 0) | |
ecfcc53f | 1348 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
e114e473 CS |
1349 | /* |
1350 | * If the secid isn't 0 we're dealing with some USB IO | |
1351 | * specific behavior. This is not clean. For one thing | |
1352 | * we can't take privilege into account. | |
1353 | */ | |
ecfcc53f EB |
1354 | return smk_access(smack_from_secid(secid), task_security(p), |
1355 | MAY_WRITE, &ad); | |
e114e473 CS |
1356 | } |
1357 | ||
1358 | /** | |
1359 | * smack_task_wait - Smack access check for waiting | |
1360 | * @p: task to wait for | |
1361 | * | |
1362 | * Returns 0 if current can wait for p, error code otherwise | |
1363 | */ | |
1364 | static int smack_task_wait(struct task_struct *p) | |
1365 | { | |
ecfcc53f EB |
1366 | struct smk_audit_info ad; |
1367 | char *sp = current_security(); | |
1368 | char *tsp = task_security(p); | |
e114e473 CS |
1369 | int rc; |
1370 | ||
ecfcc53f EB |
1371 | /* we don't log here, we can be overriden */ |
1372 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); | |
e114e473 | 1373 | if (rc == 0) |
ecfcc53f | 1374 | goto out_log; |
e114e473 CS |
1375 | |
1376 | /* | |
1377 | * Allow the operation to succeed if either task | |
1378 | * has privilege to perform operations that might | |
1379 | * account for the smack labels having gotten to | |
1380 | * be different in the first place. | |
1381 | * | |
5cd9c58f | 1382 | * This breaks the strict subject/object access |
e114e473 CS |
1383 | * control ideal, taking the object's privilege |
1384 | * state into account in the decision as well as | |
1385 | * the smack value. | |
1386 | */ | |
5cd9c58f | 1387 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1388 | rc = 0; |
1389 | /* we log only if we didn't get overriden */ | |
1390 | out_log: | |
1391 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1392 | smk_ad_setfield_u_tsk(&ad, p); | |
1393 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1394 | return rc; |
1395 | } | |
1396 | ||
1397 | /** | |
1398 | * smack_task_to_inode - copy task smack into the inode blob | |
1399 | * @p: task to copy from | |
251a2a95 | 1400 | * @inode: inode to copy to |
e114e473 CS |
1401 | * |
1402 | * Sets the smack pointer in the inode security blob | |
1403 | */ | |
1404 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1405 | { | |
1406 | struct inode_smack *isp = inode->i_security; | |
c69e8d9c | 1407 | isp->smk_inode = task_security(p); |
e114e473 CS |
1408 | } |
1409 | ||
1410 | /* | |
1411 | * Socket hooks. | |
1412 | */ | |
1413 | ||
1414 | /** | |
1415 | * smack_sk_alloc_security - Allocate a socket blob | |
1416 | * @sk: the socket | |
1417 | * @family: unused | |
251a2a95 | 1418 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1419 | * |
1420 | * Assign Smack pointers to current | |
1421 | * | |
1422 | * Returns 0 on success, -ENOMEM is there's no memory | |
1423 | */ | |
1424 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1425 | { | |
86a264ab | 1426 | char *csp = current_security(); |
e114e473 CS |
1427 | struct socket_smack *ssp; |
1428 | ||
1429 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1430 | if (ssp == NULL) | |
1431 | return -ENOMEM; | |
1432 | ||
1433 | ssp->smk_in = csp; | |
1434 | ssp->smk_out = csp; | |
1435 | ssp->smk_packet[0] = '\0'; | |
1436 | ||
1437 | sk->sk_security = ssp; | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | /** | |
1443 | * smack_sk_free_security - Free a socket blob | |
1444 | * @sk: the socket | |
1445 | * | |
1446 | * Clears the blob pointer | |
1447 | */ | |
1448 | static void smack_sk_free_security(struct sock *sk) | |
1449 | { | |
1450 | kfree(sk->sk_security); | |
1451 | } | |
1452 | ||
07feee8f PM |
1453 | /** |
1454 | * smack_host_label - check host based restrictions | |
1455 | * @sip: the object end | |
1456 | * | |
1457 | * looks for host based access restrictions | |
1458 | * | |
1459 | * This version will only be appropriate for really small sets of single label | |
1460 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1461 | * taken before calling this function. | |
1462 | * | |
1463 | * Returns the label of the far end or NULL if it's not special. | |
1464 | */ | |
1465 | static char *smack_host_label(struct sockaddr_in *sip) | |
1466 | { | |
1467 | struct smk_netlbladdr *snp; | |
1468 | struct in_addr *siap = &sip->sin_addr; | |
1469 | ||
1470 | if (siap->s_addr == 0) | |
1471 | return NULL; | |
1472 | ||
1473 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1474 | /* | |
1475 | * we break after finding the first match because | |
1476 | * the list is sorted from longest to shortest mask | |
1477 | * so we have found the most specific match | |
1478 | */ | |
1479 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1480 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1481 | /* we have found the special CIPSO option */ | |
1482 | if (snp->smk_label == smack_cipso_option) | |
1483 | return NULL; | |
07feee8f | 1484 | return snp->smk_label; |
4303154e | 1485 | } |
07feee8f PM |
1486 | |
1487 | return NULL; | |
1488 | } | |
1489 | ||
e114e473 CS |
1490 | /** |
1491 | * smack_set_catset - convert a capset to netlabel mls categories | |
1492 | * @catset: the Smack categories | |
1493 | * @sap: where to put the netlabel categories | |
1494 | * | |
1495 | * Allocates and fills attr.mls.cat | |
1496 | */ | |
1497 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1498 | { | |
1499 | unsigned char *cp; | |
1500 | unsigned char m; | |
1501 | int cat; | |
1502 | int rc; | |
1503 | int byte; | |
1504 | ||
c60264c4 | 1505 | if (!catset) |
e114e473 CS |
1506 | return; |
1507 | ||
1508 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1509 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1510 | sap->attr.mls.cat->startbit = 0; | |
1511 | ||
1512 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1513 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1514 | if ((m & *cp) == 0) | |
1515 | continue; | |
1516 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1517 | cat, GFP_ATOMIC); | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | /** | |
1522 | * smack_to_secattr - fill a secattr from a smack value | |
1523 | * @smack: the smack value | |
1524 | * @nlsp: where the result goes | |
1525 | * | |
1526 | * Casey says that CIPSO is good enough for now. | |
1527 | * It can be used to effect. | |
1528 | * It can also be abused to effect when necessary. | |
1529 | * Appologies to the TSIG group in general and GW in particular. | |
1530 | */ | |
1531 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1532 | { | |
1533 | struct smack_cipso cipso; | |
1534 | int rc; | |
1535 | ||
6d3dc07c CS |
1536 | nlsp->domain = smack; |
1537 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1538 | |
6d3dc07c CS |
1539 | rc = smack_to_cipso(smack, &cipso); |
1540 | if (rc == 0) { | |
1541 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1542 | smack_set_catset(cipso.smk_catset, nlsp); | |
1543 | } else { | |
1544 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1545 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1546 | } |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * smack_netlabel - Set the secattr on a socket | |
1551 | * @sk: the socket | |
6d3dc07c | 1552 | * @labeled: socket label scheme |
e114e473 CS |
1553 | * |
1554 | * Convert the outbound smack value (smk_out) to a | |
1555 | * secattr and attach it to the socket. | |
1556 | * | |
1557 | * Returns 0 on success or an error code | |
1558 | */ | |
6d3dc07c | 1559 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1560 | { |
07feee8f | 1561 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1562 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1563 | int rc = 0; |
e114e473 | 1564 | |
6d3dc07c CS |
1565 | /* |
1566 | * Usually the netlabel code will handle changing the | |
1567 | * packet labeling based on the label. | |
1568 | * The case of a single label host is different, because | |
1569 | * a single label host should never get a labeled packet | |
1570 | * even though the label is usually associated with a packet | |
1571 | * label. | |
1572 | */ | |
1573 | local_bh_disable(); | |
1574 | bh_lock_sock_nested(sk); | |
1575 | ||
1576 | if (ssp->smk_out == smack_net_ambient || | |
1577 | labeled == SMACK_UNLABELED_SOCKET) | |
1578 | netlbl_sock_delattr(sk); | |
1579 | else { | |
1580 | netlbl_secattr_init(&secattr); | |
1581 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1582 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1583 | netlbl_secattr_destroy(&secattr); |
1584 | } | |
1585 | ||
1586 | bh_unlock_sock(sk); | |
1587 | local_bh_enable(); | |
4bc87e62 | 1588 | |
e114e473 CS |
1589 | return rc; |
1590 | } | |
1591 | ||
07feee8f PM |
1592 | /** |
1593 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1594 | * @sk: the socket | |
1595 | * @sap: the destination address | |
1596 | * | |
1597 | * Set the correct secattr for the given socket based on the destination | |
1598 | * address and perform any outbound access checks needed. | |
1599 | * | |
1600 | * Returns 0 on success or an error code. | |
1601 | * | |
1602 | */ | |
1603 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1604 | { | |
1605 | int rc; | |
1606 | int sk_lbl; | |
1607 | char *hostsp; | |
1608 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1609 | struct smk_audit_info ad; |
07feee8f PM |
1610 | |
1611 | rcu_read_lock(); | |
1612 | hostsp = smack_host_label(sap); | |
1613 | if (hostsp != NULL) { | |
1614 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1615 | #ifdef CONFIG_AUDIT |
1616 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1617 | ad.a.u.net.family = sap->sin_family; | |
1618 | ad.a.u.net.dport = sap->sin_port; | |
1619 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1620 | #endif | |
1621 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1622 | } else { |
1623 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1624 | rc = 0; | |
1625 | } | |
1626 | rcu_read_unlock(); | |
1627 | if (rc != 0) | |
1628 | return rc; | |
1629 | ||
1630 | return smack_netlabel(sk, sk_lbl); | |
1631 | } | |
1632 | ||
e114e473 CS |
1633 | /** |
1634 | * smack_inode_setsecurity - set smack xattrs | |
1635 | * @inode: the object | |
1636 | * @name: attribute name | |
1637 | * @value: attribute value | |
1638 | * @size: size of the attribute | |
1639 | * @flags: unused | |
1640 | * | |
1641 | * Sets the named attribute in the appropriate blob | |
1642 | * | |
1643 | * Returns 0 on success, or an error code | |
1644 | */ | |
1645 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1646 | const void *value, size_t size, int flags) | |
1647 | { | |
1648 | char *sp; | |
1649 | struct inode_smack *nsp = inode->i_security; | |
1650 | struct socket_smack *ssp; | |
1651 | struct socket *sock; | |
4bc87e62 | 1652 | int rc = 0; |
e114e473 | 1653 | |
4303154e | 1654 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1655 | return -EACCES; |
1656 | ||
1657 | sp = smk_import(value, size); | |
1658 | if (sp == NULL) | |
1659 | return -EINVAL; | |
1660 | ||
1661 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1662 | nsp->smk_inode = sp; | |
ddd29ec6 | 1663 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
1664 | return 0; |
1665 | } | |
1666 | /* | |
1667 | * The rest of the Smack xattrs are only on sockets. | |
1668 | */ | |
1669 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1670 | return -EOPNOTSUPP; | |
1671 | ||
1672 | sock = SOCKET_I(inode); | |
2e1d146a | 1673 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1674 | return -EOPNOTSUPP; |
1675 | ||
1676 | ssp = sock->sk->sk_security; | |
1677 | ||
1678 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1679 | ssp->smk_in = sp; | |
1680 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1681 | ssp->smk_out = sp; | |
6d3dc07c | 1682 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
4bc87e62 CS |
1683 | if (rc != 0) |
1684 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1685 | __func__, -rc); | |
e114e473 CS |
1686 | } else |
1687 | return -EOPNOTSUPP; | |
1688 | ||
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | /** | |
1693 | * smack_socket_post_create - finish socket setup | |
1694 | * @sock: the socket | |
1695 | * @family: protocol family | |
1696 | * @type: unused | |
1697 | * @protocol: unused | |
1698 | * @kern: unused | |
1699 | * | |
1700 | * Sets the netlabel information on the socket | |
1701 | * | |
1702 | * Returns 0 on success, and error code otherwise | |
1703 | */ | |
1704 | static int smack_socket_post_create(struct socket *sock, int family, | |
1705 | int type, int protocol, int kern) | |
1706 | { | |
2e1d146a | 1707 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1708 | return 0; |
1709 | /* | |
1710 | * Set the outbound netlbl. | |
1711 | */ | |
6d3dc07c CS |
1712 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1713 | } | |
1714 | ||
6d3dc07c CS |
1715 | /** |
1716 | * smack_socket_connect - connect access check | |
1717 | * @sock: the socket | |
1718 | * @sap: the other end | |
1719 | * @addrlen: size of sap | |
1720 | * | |
1721 | * Verifies that a connection may be possible | |
1722 | * | |
1723 | * Returns 0 on success, and error code otherwise | |
1724 | */ | |
1725 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1726 | int addrlen) | |
1727 | { | |
6d3dc07c CS |
1728 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1729 | return 0; | |
6d3dc07c CS |
1730 | if (addrlen < sizeof(struct sockaddr_in)) |
1731 | return -EINVAL; | |
1732 | ||
07feee8f | 1733 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1734 | } |
1735 | ||
1736 | /** | |
1737 | * smack_flags_to_may - convert S_ to MAY_ values | |
1738 | * @flags: the S_ value | |
1739 | * | |
1740 | * Returns the equivalent MAY_ value | |
1741 | */ | |
1742 | static int smack_flags_to_may(int flags) | |
1743 | { | |
1744 | int may = 0; | |
1745 | ||
1746 | if (flags & S_IRUGO) | |
1747 | may |= MAY_READ; | |
1748 | if (flags & S_IWUGO) | |
1749 | may |= MAY_WRITE; | |
1750 | if (flags & S_IXUGO) | |
1751 | may |= MAY_EXEC; | |
1752 | ||
1753 | return may; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1758 | * @msg: the object | |
1759 | * | |
1760 | * Returns 0 | |
1761 | */ | |
1762 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1763 | { | |
86a264ab | 1764 | msg->security = current_security(); |
e114e473 CS |
1765 | return 0; |
1766 | } | |
1767 | ||
1768 | /** | |
1769 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1770 | * @msg: the object | |
1771 | * | |
1772 | * Clears the blob pointer | |
1773 | */ | |
1774 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1775 | { | |
1776 | msg->security = NULL; | |
1777 | } | |
1778 | ||
1779 | /** | |
1780 | * smack_of_shm - the smack pointer for the shm | |
1781 | * @shp: the object | |
1782 | * | |
1783 | * Returns a pointer to the smack value | |
1784 | */ | |
1785 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1786 | { | |
1787 | return (char *)shp->shm_perm.security; | |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * smack_shm_alloc_security - Set the security blob for shm | |
1792 | * @shp: the object | |
1793 | * | |
1794 | * Returns 0 | |
1795 | */ | |
1796 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1797 | { | |
1798 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1799 | ||
86a264ab | 1800 | isp->security = current_security(); |
e114e473 CS |
1801 | return 0; |
1802 | } | |
1803 | ||
1804 | /** | |
1805 | * smack_shm_free_security - Clear the security blob for shm | |
1806 | * @shp: the object | |
1807 | * | |
1808 | * Clears the blob pointer | |
1809 | */ | |
1810 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1811 | { | |
1812 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1813 | ||
1814 | isp->security = NULL; | |
1815 | } | |
1816 | ||
ecfcc53f EB |
1817 | /** |
1818 | * smk_curacc_shm : check if current has access on shm | |
1819 | * @shp : the object | |
1820 | * @access : access requested | |
1821 | * | |
1822 | * Returns 0 if current has the requested access, error code otherwise | |
1823 | */ | |
1824 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
1825 | { | |
1826 | char *ssp = smack_of_shm(shp); | |
1827 | struct smk_audit_info ad; | |
1828 | ||
1829 | #ifdef CONFIG_AUDIT | |
1830 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1831 | ad.a.u.ipc_id = shp->shm_perm.id; | |
1832 | #endif | |
1833 | return smk_curacc(ssp, access, &ad); | |
1834 | } | |
1835 | ||
e114e473 CS |
1836 | /** |
1837 | * smack_shm_associate - Smack access check for shm | |
1838 | * @shp: the object | |
1839 | * @shmflg: access requested | |
1840 | * | |
1841 | * Returns 0 if current has the requested access, error code otherwise | |
1842 | */ | |
1843 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1844 | { | |
e114e473 CS |
1845 | int may; |
1846 | ||
1847 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1848 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1849 | } |
1850 | ||
1851 | /** | |
1852 | * smack_shm_shmctl - Smack access check for shm | |
1853 | * @shp: the object | |
1854 | * @cmd: what it wants to do | |
1855 | * | |
1856 | * Returns 0 if current has the requested access, error code otherwise | |
1857 | */ | |
1858 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1859 | { | |
e114e473 CS |
1860 | int may; |
1861 | ||
1862 | switch (cmd) { | |
1863 | case IPC_STAT: | |
1864 | case SHM_STAT: | |
1865 | may = MAY_READ; | |
1866 | break; | |
1867 | case IPC_SET: | |
1868 | case SHM_LOCK: | |
1869 | case SHM_UNLOCK: | |
1870 | case IPC_RMID: | |
1871 | may = MAY_READWRITE; | |
1872 | break; | |
1873 | case IPC_INFO: | |
1874 | case SHM_INFO: | |
1875 | /* | |
1876 | * System level information. | |
1877 | */ | |
1878 | return 0; | |
1879 | default: | |
1880 | return -EINVAL; | |
1881 | } | |
ecfcc53f | 1882 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1883 | } |
1884 | ||
1885 | /** | |
1886 | * smack_shm_shmat - Smack access for shmat | |
1887 | * @shp: the object | |
1888 | * @shmaddr: unused | |
1889 | * @shmflg: access requested | |
1890 | * | |
1891 | * Returns 0 if current has the requested access, error code otherwise | |
1892 | */ | |
1893 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1894 | int shmflg) | |
1895 | { | |
e114e473 CS |
1896 | int may; |
1897 | ||
1898 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1899 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1900 | } |
1901 | ||
1902 | /** | |
1903 | * smack_of_sem - the smack pointer for the sem | |
1904 | * @sma: the object | |
1905 | * | |
1906 | * Returns a pointer to the smack value | |
1907 | */ | |
1908 | static char *smack_of_sem(struct sem_array *sma) | |
1909 | { | |
1910 | return (char *)sma->sem_perm.security; | |
1911 | } | |
1912 | ||
1913 | /** | |
1914 | * smack_sem_alloc_security - Set the security blob for sem | |
1915 | * @sma: the object | |
1916 | * | |
1917 | * Returns 0 | |
1918 | */ | |
1919 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1920 | { | |
1921 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1922 | ||
86a264ab | 1923 | isp->security = current_security(); |
e114e473 CS |
1924 | return 0; |
1925 | } | |
1926 | ||
1927 | /** | |
1928 | * smack_sem_free_security - Clear the security blob for sem | |
1929 | * @sma: the object | |
1930 | * | |
1931 | * Clears the blob pointer | |
1932 | */ | |
1933 | static void smack_sem_free_security(struct sem_array *sma) | |
1934 | { | |
1935 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1936 | ||
1937 | isp->security = NULL; | |
1938 | } | |
1939 | ||
ecfcc53f EB |
1940 | /** |
1941 | * smk_curacc_sem : check if current has access on sem | |
1942 | * @sma : the object | |
1943 | * @access : access requested | |
1944 | * | |
1945 | * Returns 0 if current has the requested access, error code otherwise | |
1946 | */ | |
1947 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
1948 | { | |
1949 | char *ssp = smack_of_sem(sma); | |
1950 | struct smk_audit_info ad; | |
1951 | ||
1952 | #ifdef CONFIG_AUDIT | |
1953 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1954 | ad.a.u.ipc_id = sma->sem_perm.id; | |
1955 | #endif | |
1956 | return smk_curacc(ssp, access, &ad); | |
1957 | } | |
1958 | ||
e114e473 CS |
1959 | /** |
1960 | * smack_sem_associate - Smack access check for sem | |
1961 | * @sma: the object | |
1962 | * @semflg: access requested | |
1963 | * | |
1964 | * Returns 0 if current has the requested access, error code otherwise | |
1965 | */ | |
1966 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1967 | { | |
e114e473 CS |
1968 | int may; |
1969 | ||
1970 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 1971 | return smk_curacc_sem(sma, may); |
e114e473 CS |
1972 | } |
1973 | ||
1974 | /** | |
1975 | * smack_sem_shmctl - Smack access check for sem | |
1976 | * @sma: the object | |
1977 | * @cmd: what it wants to do | |
1978 | * | |
1979 | * Returns 0 if current has the requested access, error code otherwise | |
1980 | */ | |
1981 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1982 | { | |
e114e473 CS |
1983 | int may; |
1984 | ||
1985 | switch (cmd) { | |
1986 | case GETPID: | |
1987 | case GETNCNT: | |
1988 | case GETZCNT: | |
1989 | case GETVAL: | |
1990 | case GETALL: | |
1991 | case IPC_STAT: | |
1992 | case SEM_STAT: | |
1993 | may = MAY_READ; | |
1994 | break; | |
1995 | case SETVAL: | |
1996 | case SETALL: | |
1997 | case IPC_RMID: | |
1998 | case IPC_SET: | |
1999 | may = MAY_READWRITE; | |
2000 | break; | |
2001 | case IPC_INFO: | |
2002 | case SEM_INFO: | |
2003 | /* | |
2004 | * System level information | |
2005 | */ | |
2006 | return 0; | |
2007 | default: | |
2008 | return -EINVAL; | |
2009 | } | |
2010 | ||
ecfcc53f | 2011 | return smk_curacc_sem(sma, may); |
e114e473 CS |
2012 | } |
2013 | ||
2014 | /** | |
2015 | * smack_sem_semop - Smack checks of semaphore operations | |
2016 | * @sma: the object | |
2017 | * @sops: unused | |
2018 | * @nsops: unused | |
2019 | * @alter: unused | |
2020 | * | |
2021 | * Treated as read and write in all cases. | |
2022 | * | |
2023 | * Returns 0 if access is allowed, error code otherwise | |
2024 | */ | |
2025 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2026 | unsigned nsops, int alter) | |
2027 | { | |
ecfcc53f | 2028 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2029 | } |
2030 | ||
2031 | /** | |
2032 | * smack_msg_alloc_security - Set the security blob for msg | |
2033 | * @msq: the object | |
2034 | * | |
2035 | * Returns 0 | |
2036 | */ | |
2037 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2038 | { | |
2039 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2040 | ||
86a264ab | 2041 | kisp->security = current_security(); |
e114e473 CS |
2042 | return 0; |
2043 | } | |
2044 | ||
2045 | /** | |
2046 | * smack_msg_free_security - Clear the security blob for msg | |
2047 | * @msq: the object | |
2048 | * | |
2049 | * Clears the blob pointer | |
2050 | */ | |
2051 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2052 | { | |
2053 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2054 | ||
2055 | kisp->security = NULL; | |
2056 | } | |
2057 | ||
2058 | /** | |
2059 | * smack_of_msq - the smack pointer for the msq | |
2060 | * @msq: the object | |
2061 | * | |
2062 | * Returns a pointer to the smack value | |
2063 | */ | |
2064 | static char *smack_of_msq(struct msg_queue *msq) | |
2065 | { | |
2066 | return (char *)msq->q_perm.security; | |
2067 | } | |
2068 | ||
ecfcc53f EB |
2069 | /** |
2070 | * smk_curacc_msq : helper to check if current has access on msq | |
2071 | * @msq : the msq | |
2072 | * @access : access requested | |
2073 | * | |
2074 | * return 0 if current has access, error otherwise | |
2075 | */ | |
2076 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2077 | { | |
2078 | char *msp = smack_of_msq(msq); | |
2079 | struct smk_audit_info ad; | |
2080 | ||
2081 | #ifdef CONFIG_AUDIT | |
2082 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2083 | ad.a.u.ipc_id = msq->q_perm.id; | |
2084 | #endif | |
2085 | return smk_curacc(msp, access, &ad); | |
2086 | } | |
2087 | ||
e114e473 CS |
2088 | /** |
2089 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2090 | * @msq: the object | |
2091 | * @msqflg: access requested | |
2092 | * | |
2093 | * Returns 0 if current has the requested access, error code otherwise | |
2094 | */ | |
2095 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2096 | { | |
e114e473 CS |
2097 | int may; |
2098 | ||
2099 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2100 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2101 | } |
2102 | ||
2103 | /** | |
2104 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2105 | * @msq: the object | |
2106 | * @cmd: what it wants to do | |
2107 | * | |
2108 | * Returns 0 if current has the requested access, error code otherwise | |
2109 | */ | |
2110 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2111 | { | |
e114e473 CS |
2112 | int may; |
2113 | ||
2114 | switch (cmd) { | |
2115 | case IPC_STAT: | |
2116 | case MSG_STAT: | |
2117 | may = MAY_READ; | |
2118 | break; | |
2119 | case IPC_SET: | |
2120 | case IPC_RMID: | |
2121 | may = MAY_READWRITE; | |
2122 | break; | |
2123 | case IPC_INFO: | |
2124 | case MSG_INFO: | |
2125 | /* | |
2126 | * System level information | |
2127 | */ | |
2128 | return 0; | |
2129 | default: | |
2130 | return -EINVAL; | |
2131 | } | |
2132 | ||
ecfcc53f | 2133 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2134 | } |
2135 | ||
2136 | /** | |
2137 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2138 | * @msq: the object | |
2139 | * @msg: unused | |
2140 | * @msqflg: access requested | |
2141 | * | |
2142 | * Returns 0 if current has the requested access, error code otherwise | |
2143 | */ | |
2144 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2145 | int msqflg) | |
2146 | { | |
ecfcc53f | 2147 | int may; |
e114e473 | 2148 | |
ecfcc53f EB |
2149 | may = smack_flags_to_may(msqflg); |
2150 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2151 | } |
2152 | ||
2153 | /** | |
2154 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2155 | * @msq: the object | |
2156 | * @msg: unused | |
2157 | * @target: unused | |
2158 | * @type: unused | |
2159 | * @mode: unused | |
2160 | * | |
2161 | * Returns 0 if current has read and write access, error code otherwise | |
2162 | */ | |
2163 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2164 | struct task_struct *target, long type, int mode) | |
2165 | { | |
ecfcc53f | 2166 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2167 | } |
2168 | ||
2169 | /** | |
2170 | * smack_ipc_permission - Smack access for ipc_permission() | |
2171 | * @ipp: the object permissions | |
2172 | * @flag: access requested | |
2173 | * | |
2174 | * Returns 0 if current has read and write access, error code otherwise | |
2175 | */ | |
2176 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2177 | { | |
2178 | char *isp = ipp->security; | |
ecfcc53f EB |
2179 | int may = smack_flags_to_may(flag); |
2180 | struct smk_audit_info ad; | |
e114e473 | 2181 | |
ecfcc53f EB |
2182 | #ifdef CONFIG_AUDIT |
2183 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2184 | ad.a.u.ipc_id = ipp->id; | |
2185 | #endif | |
2186 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2187 | } |
2188 | ||
d20bdda6 AD |
2189 | /** |
2190 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2191 | * @ipp: the object permissions |
d20bdda6 AD |
2192 | * @secid: where result will be saved |
2193 | */ | |
2194 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2195 | { | |
2196 | char *smack = ipp->security; | |
2197 | ||
2198 | *secid = smack_to_secid(smack); | |
2199 | } | |
2200 | ||
e114e473 CS |
2201 | /** |
2202 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
2203 | * @opt_dentry: unused | |
2204 | * @inode: the object | |
2205 | * | |
2206 | * Set the inode's security blob if it hasn't been done already. | |
2207 | */ | |
2208 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2209 | { | |
2210 | struct super_block *sbp; | |
2211 | struct superblock_smack *sbsp; | |
2212 | struct inode_smack *isp; | |
86a264ab | 2213 | char *csp = current_security(); |
e114e473 CS |
2214 | char *fetched; |
2215 | char *final; | |
2216 | struct dentry *dp; | |
2217 | ||
2218 | if (inode == NULL) | |
2219 | return; | |
2220 | ||
2221 | isp = inode->i_security; | |
2222 | ||
2223 | mutex_lock(&isp->smk_lock); | |
2224 | /* | |
2225 | * If the inode is already instantiated | |
2226 | * take the quick way out | |
2227 | */ | |
2228 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2229 | goto unlockandout; | |
2230 | ||
2231 | sbp = inode->i_sb; | |
2232 | sbsp = sbp->s_security; | |
2233 | /* | |
2234 | * We're going to use the superblock default label | |
2235 | * if there's no label on the file. | |
2236 | */ | |
2237 | final = sbsp->smk_default; | |
2238 | ||
e97dcb0e CS |
2239 | /* |
2240 | * If this is the root inode the superblock | |
2241 | * may be in the process of initialization. | |
2242 | * If that is the case use the root value out | |
2243 | * of the superblock. | |
2244 | */ | |
2245 | if (opt_dentry->d_parent == opt_dentry) { | |
2246 | isp->smk_inode = sbsp->smk_root; | |
2247 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2248 | goto unlockandout; | |
2249 | } | |
2250 | ||
e114e473 CS |
2251 | /* |
2252 | * This is pretty hackish. | |
2253 | * Casey says that we shouldn't have to do | |
2254 | * file system specific code, but it does help | |
2255 | * with keeping it simple. | |
2256 | */ | |
2257 | switch (sbp->s_magic) { | |
2258 | case SMACK_MAGIC: | |
2259 | /* | |
2260 | * Casey says that it's a little embarassing | |
2261 | * that the smack file system doesn't do | |
2262 | * extended attributes. | |
2263 | */ | |
2264 | final = smack_known_star.smk_known; | |
2265 | break; | |
2266 | case PIPEFS_MAGIC: | |
2267 | /* | |
2268 | * Casey says pipes are easy (?) | |
2269 | */ | |
2270 | final = smack_known_star.smk_known; | |
2271 | break; | |
2272 | case DEVPTS_SUPER_MAGIC: | |
2273 | /* | |
2274 | * devpts seems content with the label of the task. | |
2275 | * Programs that change smack have to treat the | |
2276 | * pty with respect. | |
2277 | */ | |
2278 | final = csp; | |
2279 | break; | |
2280 | case SOCKFS_MAGIC: | |
2281 | /* | |
2282 | * Casey says sockets get the smack of the task. | |
2283 | */ | |
2284 | final = csp; | |
2285 | break; | |
2286 | case PROC_SUPER_MAGIC: | |
2287 | /* | |
2288 | * Casey says procfs appears not to care. | |
2289 | * The superblock default suffices. | |
2290 | */ | |
2291 | break; | |
2292 | case TMPFS_MAGIC: | |
2293 | /* | |
2294 | * Device labels should come from the filesystem, | |
2295 | * but watch out, because they're volitile, | |
2296 | * getting recreated on every reboot. | |
2297 | */ | |
2298 | final = smack_known_star.smk_known; | |
2299 | /* | |
2300 | * No break. | |
2301 | * | |
2302 | * If a smack value has been set we want to use it, | |
2303 | * but since tmpfs isn't giving us the opportunity | |
2304 | * to set mount options simulate setting the | |
2305 | * superblock default. | |
2306 | */ | |
2307 | default: | |
2308 | /* | |
2309 | * This isn't an understood special case. | |
2310 | * Get the value from the xattr. | |
2311 | * | |
2312 | * No xattr support means, alas, no SMACK label. | |
2313 | * Use the aforeapplied default. | |
2314 | * It would be curious if the label of the task | |
2315 | * does not match that assigned. | |
2316 | */ | |
2317 | if (inode->i_op->getxattr == NULL) | |
2318 | break; | |
2319 | /* | |
2320 | * Get the dentry for xattr. | |
2321 | */ | |
2322 | if (opt_dentry == NULL) { | |
2323 | dp = d_find_alias(inode); | |
2324 | if (dp == NULL) | |
2325 | break; | |
2326 | } else { | |
2327 | dp = dget(opt_dentry); | |
2328 | if (dp == NULL) | |
2329 | break; | |
2330 | } | |
2331 | ||
2332 | fetched = smk_fetch(inode, dp); | |
2333 | if (fetched != NULL) | |
2334 | final = fetched; | |
2335 | ||
2336 | dput(dp); | |
2337 | break; | |
2338 | } | |
2339 | ||
2340 | if (final == NULL) | |
2341 | isp->smk_inode = csp; | |
2342 | else | |
2343 | isp->smk_inode = final; | |
2344 | ||
2345 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2346 | ||
2347 | unlockandout: | |
2348 | mutex_unlock(&isp->smk_lock); | |
2349 | return; | |
2350 | } | |
2351 | ||
2352 | /** | |
2353 | * smack_getprocattr - Smack process attribute access | |
2354 | * @p: the object task | |
2355 | * @name: the name of the attribute in /proc/.../attr | |
2356 | * @value: where to put the result | |
2357 | * | |
2358 | * Places a copy of the task Smack into value | |
2359 | * | |
2360 | * Returns the length of the smack label or an error code | |
2361 | */ | |
2362 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2363 | { | |
2364 | char *cp; | |
2365 | int slen; | |
2366 | ||
2367 | if (strcmp(name, "current") != 0) | |
2368 | return -EINVAL; | |
2369 | ||
c69e8d9c | 2370 | cp = kstrdup(task_security(p), GFP_KERNEL); |
e114e473 CS |
2371 | if (cp == NULL) |
2372 | return -ENOMEM; | |
2373 | ||
2374 | slen = strlen(cp); | |
2375 | *value = cp; | |
2376 | return slen; | |
2377 | } | |
2378 | ||
2379 | /** | |
2380 | * smack_setprocattr - Smack process attribute setting | |
2381 | * @p: the object task | |
2382 | * @name: the name of the attribute in /proc/.../attr | |
2383 | * @value: the value to set | |
2384 | * @size: the size of the value | |
2385 | * | |
2386 | * Sets the Smack value of the task. Only setting self | |
2387 | * is permitted and only with privilege | |
2388 | * | |
2389 | * Returns the length of the smack label or an error code | |
2390 | */ | |
2391 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2392 | void *value, size_t size) | |
2393 | { | |
d84f4f99 | 2394 | struct cred *new; |
e114e473 CS |
2395 | char *newsmack; |
2396 | ||
e114e473 CS |
2397 | /* |
2398 | * Changing another process' Smack value is too dangerous | |
2399 | * and supports no sane use case. | |
2400 | */ | |
2401 | if (p != current) | |
2402 | return -EPERM; | |
2403 | ||
5cd9c58f DH |
2404 | if (!capable(CAP_MAC_ADMIN)) |
2405 | return -EPERM; | |
2406 | ||
e114e473 CS |
2407 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2408 | return -EINVAL; | |
2409 | ||
2410 | if (strcmp(name, "current") != 0) | |
2411 | return -EINVAL; | |
2412 | ||
2413 | newsmack = smk_import(value, size); | |
2414 | if (newsmack == NULL) | |
2415 | return -EINVAL; | |
2416 | ||
6d3dc07c CS |
2417 | /* |
2418 | * No process is ever allowed the web ("@") label. | |
2419 | */ | |
2420 | if (newsmack == smack_known_web.smk_known) | |
2421 | return -EPERM; | |
2422 | ||
d84f4f99 | 2423 | new = prepare_creds(); |
6d3dc07c | 2424 | if (new == NULL) |
d84f4f99 DH |
2425 | return -ENOMEM; |
2426 | new->security = newsmack; | |
2427 | commit_creds(new); | |
e114e473 CS |
2428 | return size; |
2429 | } | |
2430 | ||
2431 | /** | |
2432 | * smack_unix_stream_connect - Smack access on UDS | |
2433 | * @sock: one socket | |
2434 | * @other: the other socket | |
2435 | * @newsk: unused | |
2436 | * | |
2437 | * Return 0 if a subject with the smack of sock could access | |
2438 | * an object with the smack of other, otherwise an error code | |
2439 | */ | |
2440 | static int smack_unix_stream_connect(struct socket *sock, | |
2441 | struct socket *other, struct sock *newsk) | |
2442 | { | |
2443 | struct inode *sp = SOCK_INODE(sock); | |
2444 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2445 | struct smk_audit_info ad; |
e114e473 | 2446 | |
ecfcc53f EB |
2447 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2448 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2449 | return smk_access(smk_of_inode(sp), smk_of_inode(op), | |
2450 | MAY_READWRITE, &ad); | |
e114e473 CS |
2451 | } |
2452 | ||
2453 | /** | |
2454 | * smack_unix_may_send - Smack access on UDS | |
2455 | * @sock: one socket | |
2456 | * @other: the other socket | |
2457 | * | |
2458 | * Return 0 if a subject with the smack of sock could access | |
2459 | * an object with the smack of other, otherwise an error code | |
2460 | */ | |
2461 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2462 | { | |
2463 | struct inode *sp = SOCK_INODE(sock); | |
2464 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2465 | struct smk_audit_info ad; |
e114e473 | 2466 | |
ecfcc53f EB |
2467 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2468 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2469 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); | |
e114e473 CS |
2470 | } |
2471 | ||
6d3dc07c CS |
2472 | /** |
2473 | * smack_socket_sendmsg - Smack check based on destination host | |
2474 | * @sock: the socket | |
251a2a95 | 2475 | * @msg: the message |
6d3dc07c CS |
2476 | * @size: the size of the message |
2477 | * | |
2478 | * Return 0 if the current subject can write to the destination | |
2479 | * host. This is only a question if the destination is a single | |
2480 | * label host. | |
2481 | */ | |
2482 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2483 | int size) | |
2484 | { | |
2485 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2486 | |
2487 | /* | |
2488 | * Perfectly reasonable for this to be NULL | |
2489 | */ | |
da34d424 | 2490 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2491 | return 0; |
2492 | ||
07feee8f | 2493 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2494 | } |
2495 | ||
2496 | ||
e114e473 | 2497 | /** |
251a2a95 | 2498 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2499 | * @sap: netlabel secattr |
2500 | * @sip: where to put the result | |
2501 | * | |
2502 | * Copies a smack label into sip | |
2503 | */ | |
2504 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2505 | { | |
2506 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2507 | char *sp; |
e114e473 CS |
2508 | int pcat; |
2509 | ||
6d3dc07c | 2510 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2511 | /* |
6d3dc07c | 2512 | * Looks like a CIPSO packet. |
e114e473 CS |
2513 | * If there are flags but no level netlabel isn't |
2514 | * behaving the way we expect it to. | |
2515 | * | |
6d3dc07c | 2516 | * Get the categories, if any |
e114e473 CS |
2517 | * Without guidance regarding the smack value |
2518 | * for the packet fall back on the network | |
2519 | * ambient value. | |
2520 | */ | |
6d3dc07c CS |
2521 | memset(smack, '\0', SMK_LABELLEN); |
2522 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2523 | for (pcat = -1;;) { | |
2524 | pcat = netlbl_secattr_catmap_walk( | |
2525 | sap->attr.mls.cat, pcat + 1); | |
2526 | if (pcat < 0) | |
2527 | break; | |
2528 | smack_catset_bit(pcat, smack); | |
2529 | } | |
2530 | /* | |
2531 | * If it is CIPSO using smack direct mapping | |
2532 | * we are already done. WeeHee. | |
2533 | */ | |
2534 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2535 | memcpy(sip, smack, SMK_MAXLEN); | |
2536 | return; | |
2537 | } | |
2538 | /* | |
2539 | * Look it up in the supplied table if it is not | |
2540 | * a direct mapping. | |
2541 | */ | |
2542 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2543 | return; |
2544 | } | |
6d3dc07c CS |
2545 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2546 | /* | |
2547 | * Looks like a fallback, which gives us a secid. | |
2548 | */ | |
2549 | sp = smack_from_secid(sap->attr.secid); | |
2550 | /* | |
2551 | * This has got to be a bug because it is | |
2552 | * impossible to specify a fallback without | |
2553 | * specifying the label, which will ensure | |
2554 | * it has a secid, and the only way to get a | |
2555 | * secid is from a fallback. | |
2556 | */ | |
2557 | BUG_ON(sp == NULL); | |
2558 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2559 | return; |
2560 | } | |
2561 | /* | |
6d3dc07c CS |
2562 | * Without guidance regarding the smack value |
2563 | * for the packet fall back on the network | |
2564 | * ambient value. | |
e114e473 | 2565 | */ |
6d3dc07c | 2566 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2567 | return; |
2568 | } | |
2569 | ||
2570 | /** | |
2571 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2572 | * @sk: socket | |
2573 | * @skb: packet | |
2574 | * | |
2575 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2576 | */ | |
2577 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2578 | { | |
2579 | struct netlbl_lsm_secattr secattr; | |
2580 | struct socket_smack *ssp = sk->sk_security; | |
2581 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2582 | char *csp; |
e114e473 | 2583 | int rc; |
ecfcc53f | 2584 | struct smk_audit_info ad; |
e114e473 CS |
2585 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2586 | return 0; | |
2587 | ||
2588 | /* | |
2589 | * Translate what netlabel gave us. | |
2590 | */ | |
e114e473 | 2591 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2592 | |
e114e473 | 2593 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2594 | if (rc == 0) { |
e114e473 | 2595 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2596 | csp = smack; |
2597 | } else | |
2598 | csp = smack_net_ambient; | |
2599 | ||
e114e473 | 2600 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2601 | |
ecfcc53f EB |
2602 | #ifdef CONFIG_AUDIT |
2603 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2604 | ad.a.u.net.family = sk->sk_family; | |
8964be4a | 2605 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2606 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2607 | #endif | |
e114e473 CS |
2608 | /* |
2609 | * Receiving a packet requires that the other end | |
2610 | * be able to write here. Read access is not required. | |
2611 | * This is the simplist possible security model | |
2612 | * for networking. | |
2613 | */ | |
ecfcc53f | 2614 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2615 | if (rc != 0) |
2616 | netlbl_skbuff_err(skb, rc, 0); | |
2617 | return rc; | |
e114e473 CS |
2618 | } |
2619 | ||
2620 | /** | |
2621 | * smack_socket_getpeersec_stream - pull in packet label | |
2622 | * @sock: the socket | |
2623 | * @optval: user's destination | |
2624 | * @optlen: size thereof | |
251a2a95 | 2625 | * @len: max thereof |
e114e473 CS |
2626 | * |
2627 | * returns zero on success, an error code otherwise | |
2628 | */ | |
2629 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2630 | char __user *optval, | |
2631 | int __user *optlen, unsigned len) | |
2632 | { | |
2633 | struct socket_smack *ssp; | |
2634 | int slen; | |
2635 | int rc = 0; | |
2636 | ||
2637 | ssp = sock->sk->sk_security; | |
2638 | slen = strlen(ssp->smk_packet) + 1; | |
2639 | ||
2640 | if (slen > len) | |
2641 | rc = -ERANGE; | |
2642 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2643 | rc = -EFAULT; | |
2644 | ||
2645 | if (put_user(slen, optlen) != 0) | |
2646 | rc = -EFAULT; | |
2647 | ||
2648 | return rc; | |
2649 | } | |
2650 | ||
2651 | ||
2652 | /** | |
2653 | * smack_socket_getpeersec_dgram - pull in packet label | |
2654 | * @sock: the socket | |
2655 | * @skb: packet data | |
2656 | * @secid: pointer to where to put the secid of the packet | |
2657 | * | |
2658 | * Sets the netlabel socket state on sk from parent | |
2659 | */ | |
2660 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2661 | struct sk_buff *skb, u32 *secid) | |
2662 | ||
2663 | { | |
2664 | struct netlbl_lsm_secattr secattr; | |
2665 | struct sock *sk; | |
2666 | char smack[SMK_LABELLEN]; | |
2667 | int family = PF_INET; | |
2668 | u32 s; | |
2669 | int rc; | |
2670 | ||
2671 | /* | |
2672 | * Only works for families with packets. | |
2673 | */ | |
2674 | if (sock != NULL) { | |
2675 | sk = sock->sk; | |
2676 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2677 | return 0; | |
2678 | family = sk->sk_family; | |
2679 | } | |
2680 | /* | |
2681 | * Translate what netlabel gave us. | |
2682 | */ | |
e114e473 CS |
2683 | netlbl_secattr_init(&secattr); |
2684 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2685 | if (rc == 0) | |
2686 | smack_from_secattr(&secattr, smack); | |
2687 | netlbl_secattr_destroy(&secattr); | |
2688 | ||
2689 | /* | |
2690 | * Give up if we couldn't get anything | |
2691 | */ | |
2692 | if (rc != 0) | |
2693 | return rc; | |
2694 | ||
2695 | s = smack_to_secid(smack); | |
2696 | if (s == 0) | |
2697 | return -EINVAL; | |
2698 | ||
2699 | *secid = s; | |
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | /** | |
07feee8f PM |
2704 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2705 | * @sk: child sock | |
2706 | * @parent: parent socket | |
e114e473 | 2707 | * |
07feee8f PM |
2708 | * Set the smk_{in,out} state of an existing sock based on the process that |
2709 | * is creating the new socket. | |
e114e473 CS |
2710 | */ |
2711 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2712 | { | |
2713 | struct socket_smack *ssp; | |
e114e473 | 2714 | |
07feee8f PM |
2715 | if (sk == NULL || |
2716 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
2717 | return; |
2718 | ||
2719 | ssp = sk->sk_security; | |
86a264ab | 2720 | ssp->smk_in = ssp->smk_out = current_security(); |
07feee8f | 2721 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
2722 | } |
2723 | ||
2724 | /** | |
2725 | * smack_inet_conn_request - Smack access check on connect | |
2726 | * @sk: socket involved | |
2727 | * @skb: packet | |
2728 | * @req: unused | |
2729 | * | |
2730 | * Returns 0 if a task with the packet label could write to | |
2731 | * the socket, otherwise an error code | |
2732 | */ | |
2733 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2734 | struct request_sock *req) | |
2735 | { | |
07feee8f | 2736 | u16 family = sk->sk_family; |
e114e473 | 2737 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
2738 | struct netlbl_lsm_secattr secattr; |
2739 | struct sockaddr_in addr; | |
2740 | struct iphdr *hdr; | |
e114e473 CS |
2741 | char smack[SMK_LABELLEN]; |
2742 | int rc; | |
ecfcc53f | 2743 | struct smk_audit_info ad; |
e114e473 | 2744 | |
07feee8f PM |
2745 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2746 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
2747 | family = PF_INET; | |
e114e473 | 2748 | |
07feee8f PM |
2749 | netlbl_secattr_init(&secattr); |
2750 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 2751 | if (rc == 0) |
07feee8f | 2752 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
2753 | else |
2754 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
2755 | netlbl_secattr_destroy(&secattr); |
2756 | ||
ecfcc53f EB |
2757 | #ifdef CONFIG_AUDIT |
2758 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2759 | ad.a.u.net.family = family; | |
8964be4a | 2760 | ad.a.u.net.netif = skb->skb_iif; |
ecfcc53f EB |
2761 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
2762 | #endif | |
e114e473 | 2763 | /* |
07feee8f PM |
2764 | * Receiving a packet requires that the other end be able to write |
2765 | * here. Read access is not required. | |
e114e473 | 2766 | */ |
ecfcc53f | 2767 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
2768 | if (rc != 0) |
2769 | return rc; | |
2770 | ||
2771 | /* | |
2772 | * Save the peer's label in the request_sock so we can later setup | |
2773 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
2774 | */ | |
2775 | req->peer_secid = smack_to_secid(smack); | |
2776 | ||
2777 | /* | |
2778 | * We need to decide if we want to label the incoming connection here | |
2779 | * if we do we only need to label the request_sock and the stack will | |
2780 | * propogate the wire-label to the sock when it is created. | |
2781 | */ | |
2782 | hdr = ip_hdr(skb); | |
2783 | addr.sin_addr.s_addr = hdr->saddr; | |
2784 | rcu_read_lock(); | |
2785 | if (smack_host_label(&addr) == NULL) { | |
2786 | rcu_read_unlock(); | |
2787 | netlbl_secattr_init(&secattr); | |
2788 | smack_to_secattr(smack, &secattr); | |
2789 | rc = netlbl_req_setattr(req, &secattr); | |
2790 | netlbl_secattr_destroy(&secattr); | |
2791 | } else { | |
2792 | rcu_read_unlock(); | |
2793 | netlbl_req_delattr(req); | |
2794 | } | |
e114e473 CS |
2795 | |
2796 | return rc; | |
2797 | } | |
2798 | ||
07feee8f PM |
2799 | /** |
2800 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
2801 | * @sk: the new socket | |
2802 | * @req: the connection's request_sock | |
2803 | * | |
2804 | * Transfer the connection's peer label to the newly created socket. | |
2805 | */ | |
2806 | static void smack_inet_csk_clone(struct sock *sk, | |
2807 | const struct request_sock *req) | |
2808 | { | |
2809 | struct socket_smack *ssp = sk->sk_security; | |
2810 | char *smack; | |
2811 | ||
2812 | if (req->peer_secid != 0) { | |
2813 | smack = smack_from_secid(req->peer_secid); | |
2814 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2815 | } else | |
2816 | ssp->smk_packet[0] = '\0'; | |
2817 | } | |
2818 | ||
e114e473 CS |
2819 | /* |
2820 | * Key management security hooks | |
2821 | * | |
2822 | * Casey has not tested key support very heavily. | |
2823 | * The permission check is most likely too restrictive. | |
2824 | * If you care about keys please have a look. | |
2825 | */ | |
2826 | #ifdef CONFIG_KEYS | |
2827 | ||
2828 | /** | |
2829 | * smack_key_alloc - Set the key security blob | |
2830 | * @key: object | |
d84f4f99 | 2831 | * @cred: the credentials to use |
e114e473 CS |
2832 | * @flags: unused |
2833 | * | |
2834 | * No allocation required | |
2835 | * | |
2836 | * Returns 0 | |
2837 | */ | |
d84f4f99 | 2838 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
2839 | unsigned long flags) |
2840 | { | |
d84f4f99 | 2841 | key->security = cred->security; |
e114e473 CS |
2842 | return 0; |
2843 | } | |
2844 | ||
2845 | /** | |
2846 | * smack_key_free - Clear the key security blob | |
2847 | * @key: the object | |
2848 | * | |
2849 | * Clear the blob pointer | |
2850 | */ | |
2851 | static void smack_key_free(struct key *key) | |
2852 | { | |
2853 | key->security = NULL; | |
2854 | } | |
2855 | ||
2856 | /* | |
2857 | * smack_key_permission - Smack access on a key | |
2858 | * @key_ref: gets to the object | |
d84f4f99 | 2859 | * @cred: the credentials to use |
e114e473 CS |
2860 | * @perm: unused |
2861 | * | |
2862 | * Return 0 if the task has read and write to the object, | |
2863 | * an error code otherwise | |
2864 | */ | |
2865 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 2866 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
2867 | { |
2868 | struct key *keyp; | |
ecfcc53f | 2869 | struct smk_audit_info ad; |
e114e473 CS |
2870 | |
2871 | keyp = key_ref_to_ptr(key_ref); | |
2872 | if (keyp == NULL) | |
2873 | return -EINVAL; | |
2874 | /* | |
2875 | * If the key hasn't been initialized give it access so that | |
2876 | * it may do so. | |
2877 | */ | |
2878 | if (keyp->security == NULL) | |
2879 | return 0; | |
2880 | /* | |
2881 | * This should not occur | |
2882 | */ | |
d84f4f99 | 2883 | if (cred->security == NULL) |
e114e473 | 2884 | return -EACCES; |
ecfcc53f EB |
2885 | #ifdef CONFIG_AUDIT |
2886 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
2887 | ad.a.u.key_struct.key = keyp->serial; | |
2888 | ad.a.u.key_struct.key_desc = keyp->description; | |
2889 | #endif | |
2890 | return smk_access(cred->security, keyp->security, | |
2891 | MAY_READWRITE, &ad); | |
e114e473 CS |
2892 | } |
2893 | #endif /* CONFIG_KEYS */ | |
2894 | ||
d20bdda6 AD |
2895 | /* |
2896 | * Smack Audit hooks | |
2897 | * | |
2898 | * Audit requires a unique representation of each Smack specific | |
2899 | * rule. This unique representation is used to distinguish the | |
2900 | * object to be audited from remaining kernel objects and also | |
2901 | * works as a glue between the audit hooks. | |
2902 | * | |
2903 | * Since repository entries are added but never deleted, we'll use | |
2904 | * the smack_known label address related to the given audit rule as | |
2905 | * the needed unique representation. This also better fits the smack | |
2906 | * model where nearly everything is a label. | |
2907 | */ | |
2908 | #ifdef CONFIG_AUDIT | |
2909 | ||
2910 | /** | |
2911 | * smack_audit_rule_init - Initialize a smack audit rule | |
2912 | * @field: audit rule fields given from user-space (audit.h) | |
2913 | * @op: required testing operator (=, !=, >, <, ...) | |
2914 | * @rulestr: smack label to be audited | |
2915 | * @vrule: pointer to save our own audit rule representation | |
2916 | * | |
2917 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2918 | * The label to be audited is created if necessay. | |
2919 | */ | |
2920 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2921 | { | |
2922 | char **rule = (char **)vrule; | |
2923 | *rule = NULL; | |
2924 | ||
2925 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2926 | return -EINVAL; | |
2927 | ||
5af75d8d | 2928 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
2929 | return -EINVAL; |
2930 | ||
2931 | *rule = smk_import(rulestr, 0); | |
2932 | ||
2933 | return 0; | |
2934 | } | |
2935 | ||
2936 | /** | |
2937 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2938 | * @krule: rule of interest, in Audit kernel representation format | |
2939 | * | |
2940 | * This is used to filter Smack rules from remaining Audit ones. | |
2941 | * If it's proved that this rule belongs to us, the | |
2942 | * audit_rule_match hook will be called to do the final judgement. | |
2943 | */ | |
2944 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2945 | { | |
2946 | struct audit_field *f; | |
2947 | int i; | |
2948 | ||
2949 | for (i = 0; i < krule->field_count; i++) { | |
2950 | f = &krule->fields[i]; | |
2951 | ||
2952 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2953 | return 1; | |
2954 | } | |
2955 | ||
2956 | return 0; | |
2957 | } | |
2958 | ||
2959 | /** | |
2960 | * smack_audit_rule_match - Audit given object ? | |
2961 | * @secid: security id for identifying the object to test | |
2962 | * @field: audit rule flags given from user-space | |
2963 | * @op: required testing operator | |
2964 | * @vrule: smack internal rule presentation | |
2965 | * @actx: audit context associated with the check | |
2966 | * | |
2967 | * The core Audit hook. It's used to take the decision of | |
2968 | * whether to audit or not to audit a given object. | |
2969 | */ | |
2970 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2971 | struct audit_context *actx) | |
2972 | { | |
2973 | char *smack; | |
2974 | char *rule = vrule; | |
2975 | ||
2976 | if (!rule) { | |
2977 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2978 | "Smack: missing rule\n"); | |
2979 | return -ENOENT; | |
2980 | } | |
2981 | ||
2982 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2983 | return 0; | |
2984 | ||
2985 | smack = smack_from_secid(secid); | |
2986 | ||
2987 | /* | |
2988 | * No need to do string comparisons. If a match occurs, | |
2989 | * both pointers will point to the same smack_known | |
2990 | * label. | |
2991 | */ | |
5af75d8d | 2992 | if (op == Audit_equal) |
d20bdda6 | 2993 | return (rule == smack); |
5af75d8d | 2994 | if (op == Audit_not_equal) |
d20bdda6 AD |
2995 | return (rule != smack); |
2996 | ||
2997 | return 0; | |
2998 | } | |
2999 | ||
3000 | /** | |
3001 | * smack_audit_rule_free - free smack rule representation | |
3002 | * @vrule: rule to be freed. | |
3003 | * | |
3004 | * No memory was allocated. | |
3005 | */ | |
3006 | static void smack_audit_rule_free(void *vrule) | |
3007 | { | |
3008 | /* No-op */ | |
3009 | } | |
3010 | ||
3011 | #endif /* CONFIG_AUDIT */ | |
3012 | ||
251a2a95 | 3013 | /** |
e114e473 CS |
3014 | * smack_secid_to_secctx - return the smack label for a secid |
3015 | * @secid: incoming integer | |
3016 | * @secdata: destination | |
3017 | * @seclen: how long it is | |
3018 | * | |
3019 | * Exists for networking code. | |
3020 | */ | |
3021 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
3022 | { | |
3023 | char *sp = smack_from_secid(secid); | |
3024 | ||
3025 | *secdata = sp; | |
3026 | *seclen = strlen(sp); | |
3027 | return 0; | |
3028 | } | |
3029 | ||
251a2a95 | 3030 | /** |
4bc87e62 CS |
3031 | * smack_secctx_to_secid - return the secid for a smack label |
3032 | * @secdata: smack label | |
3033 | * @seclen: how long result is | |
3034 | * @secid: outgoing integer | |
3035 | * | |
3036 | * Exists for audit and networking code. | |
3037 | */ | |
e52c1764 | 3038 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3039 | { |
3040 | *secid = smack_to_secid(secdata); | |
3041 | return 0; | |
3042 | } | |
3043 | ||
251a2a95 | 3044 | /** |
e114e473 | 3045 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3046 | * @secdata: unused |
3047 | * @seclen: unused | |
e114e473 CS |
3048 | * |
3049 | * Exists to make sure nothing gets done, and properly | |
3050 | */ | |
3051 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3052 | { | |
3053 | } | |
3054 | ||
1ee65e37 DQ |
3055 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
3056 | { | |
3057 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
3058 | } | |
3059 | ||
3060 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
3061 | { | |
3062 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
3063 | } | |
3064 | ||
3065 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
3066 | { | |
3067 | int len = 0; | |
3068 | len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); | |
3069 | ||
3070 | if (len < 0) | |
3071 | return len; | |
3072 | *ctxlen = len; | |
3073 | return 0; | |
3074 | } | |
3075 | ||
076c54c5 AD |
3076 | struct security_operations smack_ops = { |
3077 | .name = "smack", | |
3078 | ||
9e48858f | 3079 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3080 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3081 | .syslog = smack_syslog, |
e114e473 CS |
3082 | |
3083 | .sb_alloc_security = smack_sb_alloc_security, | |
3084 | .sb_free_security = smack_sb_free_security, | |
3085 | .sb_copy_data = smack_sb_copy_data, | |
3086 | .sb_kern_mount = smack_sb_kern_mount, | |
3087 | .sb_statfs = smack_sb_statfs, | |
3088 | .sb_mount = smack_sb_mount, | |
3089 | .sb_umount = smack_sb_umount, | |
3090 | ||
3091 | .inode_alloc_security = smack_inode_alloc_security, | |
3092 | .inode_free_security = smack_inode_free_security, | |
3093 | .inode_init_security = smack_inode_init_security, | |
3094 | .inode_link = smack_inode_link, | |
3095 | .inode_unlink = smack_inode_unlink, | |
3096 | .inode_rmdir = smack_inode_rmdir, | |
3097 | .inode_rename = smack_inode_rename, | |
3098 | .inode_permission = smack_inode_permission, | |
3099 | .inode_setattr = smack_inode_setattr, | |
3100 | .inode_getattr = smack_inode_getattr, | |
3101 | .inode_setxattr = smack_inode_setxattr, | |
3102 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3103 | .inode_getxattr = smack_inode_getxattr, | |
3104 | .inode_removexattr = smack_inode_removexattr, | |
3105 | .inode_getsecurity = smack_inode_getsecurity, | |
3106 | .inode_setsecurity = smack_inode_setsecurity, | |
3107 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3108 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3109 | |
3110 | .file_permission = smack_file_permission, | |
3111 | .file_alloc_security = smack_file_alloc_security, | |
3112 | .file_free_security = smack_file_free_security, | |
3113 | .file_ioctl = smack_file_ioctl, | |
3114 | .file_lock = smack_file_lock, | |
3115 | .file_fcntl = smack_file_fcntl, | |
3116 | .file_set_fowner = smack_file_set_fowner, | |
3117 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3118 | .file_receive = smack_file_receive, | |
3119 | ||
ee18d64c | 3120 | .cred_alloc_blank = smack_cred_alloc_blank, |
f1752eec | 3121 | .cred_free = smack_cred_free, |
d84f4f99 DH |
3122 | .cred_prepare = smack_cred_prepare, |
3123 | .cred_commit = smack_cred_commit, | |
ee18d64c | 3124 | .cred_transfer = smack_cred_transfer, |
3a3b7ce9 DH |
3125 | .kernel_act_as = smack_kernel_act_as, |
3126 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3127 | .task_setpgid = smack_task_setpgid, |
3128 | .task_getpgid = smack_task_getpgid, | |
3129 | .task_getsid = smack_task_getsid, | |
3130 | .task_getsecid = smack_task_getsecid, | |
3131 | .task_setnice = smack_task_setnice, | |
3132 | .task_setioprio = smack_task_setioprio, | |
3133 | .task_getioprio = smack_task_getioprio, | |
3134 | .task_setscheduler = smack_task_setscheduler, | |
3135 | .task_getscheduler = smack_task_getscheduler, | |
3136 | .task_movememory = smack_task_movememory, | |
3137 | .task_kill = smack_task_kill, | |
3138 | .task_wait = smack_task_wait, | |
e114e473 CS |
3139 | .task_to_inode = smack_task_to_inode, |
3140 | ||
3141 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3142 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3143 | |
3144 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3145 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3146 | ||
3147 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3148 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3149 | .msg_queue_associate = smack_msg_queue_associate, | |
3150 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3151 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3152 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3153 | ||
3154 | .shm_alloc_security = smack_shm_alloc_security, | |
3155 | .shm_free_security = smack_shm_free_security, | |
3156 | .shm_associate = smack_shm_associate, | |
3157 | .shm_shmctl = smack_shm_shmctl, | |
3158 | .shm_shmat = smack_shm_shmat, | |
3159 | ||
3160 | .sem_alloc_security = smack_sem_alloc_security, | |
3161 | .sem_free_security = smack_sem_free_security, | |
3162 | .sem_associate = smack_sem_associate, | |
3163 | .sem_semctl = smack_sem_semctl, | |
3164 | .sem_semop = smack_sem_semop, | |
3165 | ||
e114e473 CS |
3166 | .d_instantiate = smack_d_instantiate, |
3167 | ||
3168 | .getprocattr = smack_getprocattr, | |
3169 | .setprocattr = smack_setprocattr, | |
3170 | ||
3171 | .unix_stream_connect = smack_unix_stream_connect, | |
3172 | .unix_may_send = smack_unix_may_send, | |
3173 | ||
3174 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3175 | .socket_connect = smack_socket_connect, |
3176 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3177 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3178 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3179 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3180 | .sk_alloc_security = smack_sk_alloc_security, | |
3181 | .sk_free_security = smack_sk_free_security, | |
3182 | .sock_graft = smack_sock_graft, | |
3183 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3184 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3185 | |
e114e473 CS |
3186 | /* key management security hooks */ |
3187 | #ifdef CONFIG_KEYS | |
3188 | .key_alloc = smack_key_alloc, | |
3189 | .key_free = smack_key_free, | |
3190 | .key_permission = smack_key_permission, | |
3191 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3192 | |
3193 | /* Audit hooks */ | |
3194 | #ifdef CONFIG_AUDIT | |
3195 | .audit_rule_init = smack_audit_rule_init, | |
3196 | .audit_rule_known = smack_audit_rule_known, | |
3197 | .audit_rule_match = smack_audit_rule_match, | |
3198 | .audit_rule_free = smack_audit_rule_free, | |
3199 | #endif /* CONFIG_AUDIT */ | |
3200 | ||
e114e473 | 3201 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3202 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 | 3203 | .release_secctx = smack_release_secctx, |
1ee65e37 DQ |
3204 | .inode_notifysecctx = smack_inode_notifysecctx, |
3205 | .inode_setsecctx = smack_inode_setsecctx, | |
3206 | .inode_getsecctx = smack_inode_getsecctx, | |
e114e473 CS |
3207 | }; |
3208 | ||
7198e2ee EB |
3209 | |
3210 | static __init void init_smack_know_list(void) | |
3211 | { | |
3212 | list_add(&smack_known_huh.list, &smack_known_list); | |
3213 | list_add(&smack_known_hat.list, &smack_known_list); | |
3214 | list_add(&smack_known_star.list, &smack_known_list); | |
3215 | list_add(&smack_known_floor.list, &smack_known_list); | |
3216 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3217 | list_add(&smack_known_web.list, &smack_known_list); | |
3218 | } | |
3219 | ||
e114e473 CS |
3220 | /** |
3221 | * smack_init - initialize the smack system | |
3222 | * | |
3223 | * Returns 0 | |
3224 | */ | |
3225 | static __init int smack_init(void) | |
3226 | { | |
d84f4f99 DH |
3227 | struct cred *cred; |
3228 | ||
076c54c5 AD |
3229 | if (!security_module_enable(&smack_ops)) |
3230 | return 0; | |
3231 | ||
e114e473 CS |
3232 | printk(KERN_INFO "Smack: Initializing.\n"); |
3233 | ||
3234 | /* | |
3235 | * Set the security state for the initial task. | |
3236 | */ | |
d84f4f99 DH |
3237 | cred = (struct cred *) current->cred; |
3238 | cred->security = &smack_known_floor.smk_known; | |
e114e473 | 3239 | |
7198e2ee EB |
3240 | /* initilize the smack_know_list */ |
3241 | init_smack_know_list(); | |
e114e473 CS |
3242 | /* |
3243 | * Initialize locks | |
3244 | */ | |
e114e473 CS |
3245 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3246 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3247 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3248 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3249 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3250 | ||
3251 | /* | |
3252 | * Register with LSM | |
3253 | */ | |
3254 | if (register_security(&smack_ops)) | |
3255 | panic("smack: Unable to register with kernel.\n"); | |
3256 | ||
3257 | return 0; | |
3258 | } | |
3259 | ||
3260 | /* | |
3261 | * Smack requires early initialization in order to label | |
3262 | * all processes and objects when they are created. | |
3263 | */ | |
3264 | security_initcall(smack_init); |