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> |
e114e473 CS |
33 | #include "smack.h" |
34 | ||
c69e8d9c DH |
35 | #define task_security(task) (task_cred_xxx((task), security)) |
36 | ||
e114e473 CS |
37 | /* |
38 | * I hope these are the hokeyist lines of code in the module. Casey. | |
39 | */ | |
40 | #define DEVPTS_SUPER_MAGIC 0x1cd1 | |
41 | #define SOCKFS_MAGIC 0x534F434B | |
42 | #define TMPFS_MAGIC 0x01021994 | |
43 | ||
44 | /** | |
45 | * smk_fetch - Fetch the smack label from a file. | |
46 | * @ip: a pointer to the inode | |
47 | * @dp: a pointer to the dentry | |
48 | * | |
49 | * Returns a pointer to the master list entry for the Smack label | |
50 | * or NULL if there was no label to fetch. | |
51 | */ | |
52 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
53 | { | |
54 | int rc; | |
55 | char in[SMK_LABELLEN]; | |
56 | ||
57 | if (ip->i_op->getxattr == NULL) | |
58 | return NULL; | |
59 | ||
60 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
61 | if (rc < 0) | |
62 | return NULL; | |
63 | ||
64 | return smk_import(in, rc); | |
65 | } | |
66 | ||
67 | /** | |
68 | * new_inode_smack - allocate an inode security blob | |
69 | * @smack: a pointer to the Smack label to use in the blob | |
70 | * | |
71 | * Returns the new blob or NULL if there's no memory available | |
72 | */ | |
73 | struct inode_smack *new_inode_smack(char *smack) | |
74 | { | |
75 | struct inode_smack *isp; | |
76 | ||
77 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
78 | if (isp == NULL) | |
79 | return NULL; | |
80 | ||
81 | isp->smk_inode = smack; | |
82 | isp->smk_flags = 0; | |
83 | mutex_init(&isp->smk_lock); | |
84 | ||
85 | return isp; | |
86 | } | |
87 | ||
88 | /* | |
89 | * LSM hooks. | |
90 | * We he, that is fun! | |
91 | */ | |
92 | ||
93 | /** | |
9e48858f | 94 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 95 | * @ctp: child task pointer |
251a2a95 | 96 | * @mode: ptrace attachment mode |
e114e473 CS |
97 | * |
98 | * Returns 0 if access is OK, an error code otherwise | |
99 | * | |
100 | * Do the capability checks, and require read and write. | |
101 | */ | |
9e48858f | 102 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 CS |
103 | { |
104 | int rc; | |
ecfcc53f EB |
105 | struct smk_audit_info ad; |
106 | char *sp, *tsp; | |
e114e473 | 107 | |
9e48858f | 108 | rc = cap_ptrace_access_check(ctp, mode); |
e114e473 CS |
109 | if (rc != 0) |
110 | return rc; | |
111 | ||
ecfcc53f EB |
112 | sp = current_security(); |
113 | tsp = task_security(ctp); | |
114 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
115 | smk_ad_setfield_u_tsk(&ad, ctp); | |
116 | ||
117 | /* we won't log here, because rc can be overriden */ | |
118 | rc = smk_access(sp, tsp, MAY_READWRITE, NULL); | |
5cd9c58f | 119 | if (rc != 0 && capable(CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
120 | rc = 0; |
121 | ||
122 | smack_log(sp, tsp, MAY_READWRITE, rc, &ad); | |
5cd9c58f DH |
123 | return rc; |
124 | } | |
125 | ||
126 | /** | |
127 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
128 | * @ptp: parent task pointer | |
129 | * | |
130 | * Returns 0 if access is OK, an error code otherwise | |
131 | * | |
132 | * Do the capability checks, and require read and write. | |
133 | */ | |
134 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
135 | { | |
136 | int rc; | |
ecfcc53f EB |
137 | struct smk_audit_info ad; |
138 | char *sp, *tsp; | |
5cd9c58f DH |
139 | |
140 | rc = cap_ptrace_traceme(ptp); | |
141 | if (rc != 0) | |
142 | return rc; | |
e114e473 | 143 | |
ecfcc53f EB |
144 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
145 | smk_ad_setfield_u_tsk(&ad, ptp); | |
146 | ||
147 | sp = current_security(); | |
148 | tsp = task_security(ptp); | |
149 | /* we won't log here, because rc can be overriden */ | |
150 | rc = smk_access(tsp, sp, MAY_READWRITE, NULL); | |
5cd9c58f | 151 | if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
152 | rc = 0; |
153 | ||
154 | smack_log(tsp, sp, MAY_READWRITE, rc, &ad); | |
e114e473 CS |
155 | return rc; |
156 | } | |
157 | ||
158 | /** | |
159 | * smack_syslog - Smack approval on syslog | |
160 | * @type: message type | |
161 | * | |
162 | * Require that the task has the floor label | |
163 | * | |
164 | * Returns 0 on success, error code otherwise. | |
165 | */ | |
166 | static int smack_syslog(int type) | |
167 | { | |
168 | int rc; | |
86a264ab | 169 | char *sp = current_security(); |
e114e473 CS |
170 | |
171 | rc = cap_syslog(type); | |
172 | if (rc != 0) | |
173 | return rc; | |
174 | ||
175 | if (capable(CAP_MAC_OVERRIDE)) | |
176 | return 0; | |
177 | ||
178 | if (sp != smack_known_floor.smk_known) | |
179 | rc = -EACCES; | |
180 | ||
181 | return rc; | |
182 | } | |
183 | ||
184 | ||
185 | /* | |
186 | * Superblock Hooks. | |
187 | */ | |
188 | ||
189 | /** | |
190 | * smack_sb_alloc_security - allocate a superblock blob | |
191 | * @sb: the superblock getting the blob | |
192 | * | |
193 | * Returns 0 on success or -ENOMEM on error. | |
194 | */ | |
195 | static int smack_sb_alloc_security(struct super_block *sb) | |
196 | { | |
197 | struct superblock_smack *sbsp; | |
198 | ||
199 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
200 | ||
201 | if (sbsp == NULL) | |
202 | return -ENOMEM; | |
203 | ||
204 | sbsp->smk_root = smack_known_floor.smk_known; | |
205 | sbsp->smk_default = smack_known_floor.smk_known; | |
206 | sbsp->smk_floor = smack_known_floor.smk_known; | |
207 | sbsp->smk_hat = smack_known_hat.smk_known; | |
208 | sbsp->smk_initialized = 0; | |
209 | spin_lock_init(&sbsp->smk_sblock); | |
210 | ||
211 | sb->s_security = sbsp; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * smack_sb_free_security - free a superblock blob | |
218 | * @sb: the superblock getting the blob | |
219 | * | |
220 | */ | |
221 | static void smack_sb_free_security(struct super_block *sb) | |
222 | { | |
223 | kfree(sb->s_security); | |
224 | sb->s_security = NULL; | |
225 | } | |
226 | ||
227 | /** | |
228 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 229 | * @orig: where to start |
251a2a95 | 230 | * @smackopts: mount options string |
e114e473 CS |
231 | * |
232 | * Returns 0 on success or -ENOMEM on error. | |
233 | * | |
234 | * Copy the Smack specific mount options out of the mount | |
235 | * options list. | |
236 | */ | |
e0007529 | 237 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
238 | { |
239 | char *cp, *commap, *otheropts, *dp; | |
240 | ||
e114e473 CS |
241 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
242 | if (otheropts == NULL) | |
243 | return -ENOMEM; | |
244 | ||
245 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
246 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
247 | dp = smackopts; | |
248 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
249 | dp = smackopts; | |
250 | else if (strstr(cp, SMK_FSHAT) == cp) | |
251 | dp = smackopts; | |
252 | else if (strstr(cp, SMK_FSROOT) == cp) | |
253 | dp = smackopts; | |
254 | else | |
255 | dp = otheropts; | |
256 | ||
257 | commap = strchr(cp, ','); | |
258 | if (commap != NULL) | |
259 | *commap = '\0'; | |
260 | ||
261 | if (*dp != '\0') | |
262 | strcat(dp, ","); | |
263 | strcat(dp, cp); | |
264 | } | |
265 | ||
266 | strcpy(orig, otheropts); | |
267 | free_page((unsigned long)otheropts); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | /** | |
273 | * smack_sb_kern_mount - Smack specific mount processing | |
274 | * @sb: the file system superblock | |
12204e24 | 275 | * @flags: the mount flags |
e114e473 CS |
276 | * @data: the smack mount options |
277 | * | |
278 | * Returns 0 on success, an error code on failure | |
279 | */ | |
12204e24 | 280 | static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) |
e114e473 CS |
281 | { |
282 | struct dentry *root = sb->s_root; | |
283 | struct inode *inode = root->d_inode; | |
284 | struct superblock_smack *sp = sb->s_security; | |
285 | struct inode_smack *isp; | |
286 | char *op; | |
287 | char *commap; | |
288 | char *nsp; | |
289 | ||
290 | spin_lock(&sp->smk_sblock); | |
291 | if (sp->smk_initialized != 0) { | |
292 | spin_unlock(&sp->smk_sblock); | |
293 | return 0; | |
294 | } | |
295 | sp->smk_initialized = 1; | |
296 | spin_unlock(&sp->smk_sblock); | |
297 | ||
298 | for (op = data; op != NULL; op = commap) { | |
299 | commap = strchr(op, ','); | |
300 | if (commap != NULL) | |
301 | *commap++ = '\0'; | |
302 | ||
303 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
304 | op += strlen(SMK_FSHAT); | |
305 | nsp = smk_import(op, 0); | |
306 | if (nsp != NULL) | |
307 | sp->smk_hat = nsp; | |
308 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
309 | op += strlen(SMK_FSFLOOR); | |
310 | nsp = smk_import(op, 0); | |
311 | if (nsp != NULL) | |
312 | sp->smk_floor = nsp; | |
313 | } else if (strncmp(op, SMK_FSDEFAULT, | |
314 | strlen(SMK_FSDEFAULT)) == 0) { | |
315 | op += strlen(SMK_FSDEFAULT); | |
316 | nsp = smk_import(op, 0); | |
317 | if (nsp != NULL) | |
318 | sp->smk_default = nsp; | |
319 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
320 | op += strlen(SMK_FSROOT); | |
321 | nsp = smk_import(op, 0); | |
322 | if (nsp != NULL) | |
323 | sp->smk_root = nsp; | |
324 | } | |
325 | } | |
326 | ||
327 | /* | |
328 | * Initialize the root inode. | |
329 | */ | |
330 | isp = inode->i_security; | |
331 | if (isp == NULL) | |
332 | inode->i_security = new_inode_smack(sp->smk_root); | |
333 | else | |
334 | isp->smk_inode = sp->smk_root; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | /** | |
340 | * smack_sb_statfs - Smack check on statfs | |
341 | * @dentry: identifies the file system in question | |
342 | * | |
343 | * Returns 0 if current can read the floor of the filesystem, | |
344 | * and error code otherwise | |
345 | */ | |
346 | static int smack_sb_statfs(struct dentry *dentry) | |
347 | { | |
348 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
349 | int rc; |
350 | struct smk_audit_info ad; | |
351 | ||
352 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
353 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 354 | |
ecfcc53f EB |
355 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
356 | return rc; | |
e114e473 CS |
357 | } |
358 | ||
359 | /** | |
360 | * smack_sb_mount - Smack check for mounting | |
361 | * @dev_name: unused | |
251a2a95 | 362 | * @path: mount point |
e114e473 CS |
363 | * @type: unused |
364 | * @flags: unused | |
365 | * @data: unused | |
366 | * | |
367 | * Returns 0 if current can write the floor of the filesystem | |
368 | * being mounted on, an error code otherwise. | |
369 | */ | |
b5266eb4 | 370 | static int smack_sb_mount(char *dev_name, struct path *path, |
e114e473 CS |
371 | char *type, unsigned long flags, void *data) |
372 | { | |
b5266eb4 | 373 | struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; |
ecfcc53f | 374 | struct smk_audit_info ad; |
e114e473 | 375 | |
ecfcc53f EB |
376 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
377 | smk_ad_setfield_u_fs_path(&ad, *path); | |
378 | ||
379 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
380 | } |
381 | ||
382 | /** | |
383 | * smack_sb_umount - Smack check for unmounting | |
384 | * @mnt: file system to unmount | |
385 | * @flags: unused | |
386 | * | |
387 | * Returns 0 if current can write the floor of the filesystem | |
388 | * being unmounted, an error code otherwise. | |
389 | */ | |
390 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
391 | { | |
392 | struct superblock_smack *sbp; | |
ecfcc53f | 393 | struct smk_audit_info ad; |
e114e473 | 394 | |
ecfcc53f EB |
395 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
396 | smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_mountpoint); | |
397 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
e114e473 | 398 | |
ecfcc53f EB |
399 | sbp = mnt->mnt_sb->s_security; |
400 | return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); | |
e114e473 CS |
401 | } |
402 | ||
403 | /* | |
404 | * Inode hooks | |
405 | */ | |
406 | ||
407 | /** | |
408 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 409 | * @inode: the inode in need of a blob |
e114e473 CS |
410 | * |
411 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
412 | */ | |
413 | static int smack_inode_alloc_security(struct inode *inode) | |
414 | { | |
86a264ab | 415 | inode->i_security = new_inode_smack(current_security()); |
e114e473 CS |
416 | if (inode->i_security == NULL) |
417 | return -ENOMEM; | |
418 | return 0; | |
419 | } | |
420 | ||
421 | /** | |
422 | * smack_inode_free_security - free an inode blob | |
251a2a95 | 423 | * @inode: the inode with a blob |
e114e473 CS |
424 | * |
425 | * Clears the blob pointer in inode | |
426 | */ | |
427 | static void smack_inode_free_security(struct inode *inode) | |
428 | { | |
429 | kfree(inode->i_security); | |
430 | inode->i_security = NULL; | |
431 | } | |
432 | ||
433 | /** | |
434 | * smack_inode_init_security - copy out the smack from an inode | |
435 | * @inode: the inode | |
436 | * @dir: unused | |
437 | * @name: where to put the attribute name | |
438 | * @value: where to put the attribute value | |
439 | * @len: where to put the length of the attribute | |
440 | * | |
441 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
442 | */ | |
443 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
444 | char **name, void **value, size_t *len) | |
445 | { | |
446 | char *isp = smk_of_inode(inode); | |
447 | ||
448 | if (name) { | |
449 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
450 | if (*name == NULL) | |
451 | return -ENOMEM; | |
452 | } | |
453 | ||
454 | if (value) { | |
455 | *value = kstrdup(isp, GFP_KERNEL); | |
456 | if (*value == NULL) | |
457 | return -ENOMEM; | |
458 | } | |
459 | ||
460 | if (len) | |
461 | *len = strlen(isp) + 1; | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | /** | |
467 | * smack_inode_link - Smack check on link | |
468 | * @old_dentry: the existing object | |
469 | * @dir: unused | |
470 | * @new_dentry: the new object | |
471 | * | |
472 | * Returns 0 if access is permitted, an error code otherwise | |
473 | */ | |
474 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
475 | struct dentry *new_dentry) | |
476 | { | |
e114e473 | 477 | char *isp; |
ecfcc53f EB |
478 | struct smk_audit_info ad; |
479 | int rc; | |
480 | ||
481 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
482 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
483 | |
484 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 485 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
e114e473 CS |
486 | |
487 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
488 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
489 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
490 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
e114e473 CS |
491 | } |
492 | ||
493 | return rc; | |
494 | } | |
495 | ||
496 | /** | |
497 | * smack_inode_unlink - Smack check on inode deletion | |
498 | * @dir: containing directory object | |
499 | * @dentry: file to unlink | |
500 | * | |
501 | * Returns 0 if current can write the containing directory | |
502 | * and the object, error code otherwise | |
503 | */ | |
504 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
505 | { | |
506 | struct inode *ip = dentry->d_inode; | |
ecfcc53f | 507 | struct smk_audit_info ad; |
e114e473 CS |
508 | int rc; |
509 | ||
ecfcc53f EB |
510 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
511 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
512 | ||
e114e473 CS |
513 | /* |
514 | * You need write access to the thing you're unlinking | |
515 | */ | |
ecfcc53f EB |
516 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
517 | if (rc == 0) { | |
e114e473 CS |
518 | /* |
519 | * You also need write access to the containing directory | |
520 | */ | |
ecfcc53f EB |
521 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
522 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
523 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
524 | } | |
e114e473 CS |
525 | return rc; |
526 | } | |
527 | ||
528 | /** | |
529 | * smack_inode_rmdir - Smack check on directory deletion | |
530 | * @dir: containing directory object | |
531 | * @dentry: directory to unlink | |
532 | * | |
533 | * Returns 0 if current can write the containing directory | |
534 | * and the directory, error code otherwise | |
535 | */ | |
536 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
537 | { | |
ecfcc53f | 538 | struct smk_audit_info ad; |
e114e473 CS |
539 | int rc; |
540 | ||
ecfcc53f EB |
541 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
542 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
543 | ||
e114e473 CS |
544 | /* |
545 | * You need write access to the thing you're removing | |
546 | */ | |
ecfcc53f EB |
547 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
548 | if (rc == 0) { | |
e114e473 CS |
549 | /* |
550 | * You also need write access to the containing directory | |
551 | */ | |
ecfcc53f EB |
552 | smk_ad_setfield_u_fs_path_dentry(&ad, NULL); |
553 | smk_ad_setfield_u_fs_inode(&ad, dir); | |
554 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
555 | } | |
e114e473 CS |
556 | |
557 | return rc; | |
558 | } | |
559 | ||
560 | /** | |
561 | * smack_inode_rename - Smack check on rename | |
562 | * @old_inode: the old directory | |
563 | * @old_dentry: unused | |
564 | * @new_inode: the new directory | |
565 | * @new_dentry: unused | |
566 | * | |
567 | * Read and write access is required on both the old and | |
568 | * new directories. | |
569 | * | |
570 | * Returns 0 if access is permitted, an error code otherwise | |
571 | */ | |
572 | static int smack_inode_rename(struct inode *old_inode, | |
573 | struct dentry *old_dentry, | |
574 | struct inode *new_inode, | |
575 | struct dentry *new_dentry) | |
576 | { | |
577 | int rc; | |
578 | char *isp; | |
ecfcc53f EB |
579 | struct smk_audit_info ad; |
580 | ||
581 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
582 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); | |
e114e473 CS |
583 | |
584 | isp = smk_of_inode(old_dentry->d_inode); | |
ecfcc53f | 585 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
e114e473 CS |
586 | |
587 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
588 | isp = smk_of_inode(new_dentry->d_inode); | |
ecfcc53f EB |
589 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
590 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
e114e473 | 591 | } |
e114e473 CS |
592 | return rc; |
593 | } | |
594 | ||
595 | /** | |
596 | * smack_inode_permission - Smack version of permission() | |
597 | * @inode: the inode in question | |
598 | * @mask: the access requested | |
e114e473 CS |
599 | * |
600 | * This is the important Smack hook. | |
601 | * | |
602 | * Returns 0 if access is permitted, -EACCES otherwise | |
603 | */ | |
b77b0646 | 604 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 605 | { |
ecfcc53f | 606 | struct smk_audit_info ad; |
e114e473 CS |
607 | /* |
608 | * No permission to check. Existence test. Yup, it's there. | |
609 | */ | |
610 | if (mask == 0) | |
611 | return 0; | |
ecfcc53f EB |
612 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
613 | smk_ad_setfield_u_fs_inode(&ad, inode); | |
614 | return smk_curacc(smk_of_inode(inode), mask, &ad); | |
e114e473 CS |
615 | } |
616 | ||
617 | /** | |
618 | * smack_inode_setattr - Smack check for setting attributes | |
619 | * @dentry: the object | |
620 | * @iattr: for the force flag | |
621 | * | |
622 | * Returns 0 if access is permitted, an error code otherwise | |
623 | */ | |
624 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
625 | { | |
ecfcc53f | 626 | struct smk_audit_info ad; |
e114e473 CS |
627 | /* |
628 | * Need to allow for clearing the setuid bit. | |
629 | */ | |
630 | if (iattr->ia_valid & ATTR_FORCE) | |
631 | return 0; | |
ecfcc53f EB |
632 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
633 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
e114e473 | 634 | |
ecfcc53f | 635 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
e114e473 CS |
636 | } |
637 | ||
638 | /** | |
639 | * smack_inode_getattr - Smack check for getting attributes | |
640 | * @mnt: unused | |
641 | * @dentry: the object | |
642 | * | |
643 | * Returns 0 if access is permitted, an error code otherwise | |
644 | */ | |
645 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
646 | { | |
ecfcc53f EB |
647 | struct smk_audit_info ad; |
648 | ||
649 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
650 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
651 | smk_ad_setfield_u_fs_path_mnt(&ad, mnt); | |
652 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
653 | } |
654 | ||
655 | /** | |
656 | * smack_inode_setxattr - Smack check for setting xattrs | |
657 | * @dentry: the object | |
658 | * @name: name of the attribute | |
659 | * @value: unused | |
660 | * @size: unused | |
661 | * @flags: unused | |
662 | * | |
663 | * This protects the Smack attribute explicitly. | |
664 | * | |
665 | * Returns 0 if access is permitted, an error code otherwise | |
666 | */ | |
8f0cfa52 DH |
667 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
668 | const void *value, size_t size, int flags) | |
e114e473 | 669 | { |
ecfcc53f | 670 | struct smk_audit_info ad; |
bcdca225 | 671 | int rc = 0; |
e114e473 | 672 | |
bcdca225 CS |
673 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
674 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
675 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
676 | if (!capable(CAP_MAC_ADMIN)) | |
677 | rc = -EPERM; | |
defc433b EB |
678 | /* |
679 | * check label validity here so import wont fail on | |
680 | * post_setxattr | |
681 | */ | |
682 | if (size == 0 || size >= SMK_LABELLEN || | |
683 | smk_import(value, size) == NULL) | |
4303154e | 684 | rc = -EINVAL; |
bcdca225 CS |
685 | } else |
686 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
687 | ||
ecfcc53f EB |
688 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
689 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
690 | ||
bcdca225 | 691 | if (rc == 0) |
ecfcc53f | 692 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
693 | |
694 | return rc; | |
e114e473 CS |
695 | } |
696 | ||
697 | /** | |
698 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
699 | * @dentry: object | |
700 | * @name: attribute name | |
701 | * @value: attribute value | |
702 | * @size: attribute size | |
703 | * @flags: unused | |
704 | * | |
705 | * Set the pointer in the inode blob to the entry found | |
706 | * in the master label list. | |
707 | */ | |
8f0cfa52 DH |
708 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
709 | const void *value, size_t size, int flags) | |
e114e473 CS |
710 | { |
711 | struct inode_smack *isp; | |
712 | char *nsp; | |
713 | ||
714 | /* | |
715 | * Not SMACK | |
716 | */ | |
717 | if (strcmp(name, XATTR_NAME_SMACK)) | |
718 | return; | |
719 | ||
e114e473 CS |
720 | isp = dentry->d_inode->i_security; |
721 | ||
722 | /* | |
723 | * No locking is done here. This is a pointer | |
724 | * assignment. | |
725 | */ | |
726 | nsp = smk_import(value, size); | |
727 | if (nsp != NULL) | |
728 | isp->smk_inode = nsp; | |
729 | else | |
730 | isp->smk_inode = smack_known_invalid.smk_known; | |
731 | ||
732 | return; | |
733 | } | |
734 | ||
735 | /* | |
736 | * smack_inode_getxattr - Smack check on getxattr | |
737 | * @dentry: the object | |
738 | * @name: unused | |
739 | * | |
740 | * Returns 0 if access is permitted, an error code otherwise | |
741 | */ | |
8f0cfa52 | 742 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 743 | { |
ecfcc53f EB |
744 | struct smk_audit_info ad; |
745 | ||
746 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
747 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
748 | ||
749 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); | |
e114e473 CS |
750 | } |
751 | ||
752 | /* | |
753 | * smack_inode_removexattr - Smack check on removexattr | |
754 | * @dentry: the object | |
755 | * @name: name of the attribute | |
756 | * | |
757 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
758 | * | |
759 | * Returns 0 if access is permitted, an error code otherwise | |
760 | */ | |
8f0cfa52 | 761 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 762 | { |
ecfcc53f | 763 | struct smk_audit_info ad; |
bcdca225 | 764 | int rc = 0; |
e114e473 | 765 | |
bcdca225 CS |
766 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
767 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
768 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
769 | if (!capable(CAP_MAC_ADMIN)) | |
770 | rc = -EPERM; | |
771 | } else | |
772 | rc = cap_inode_removexattr(dentry, name); | |
773 | ||
ecfcc53f EB |
774 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
775 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); | |
bcdca225 | 776 | if (rc == 0) |
ecfcc53f | 777 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); |
bcdca225 CS |
778 | |
779 | return rc; | |
e114e473 CS |
780 | } |
781 | ||
782 | /** | |
783 | * smack_inode_getsecurity - get smack xattrs | |
784 | * @inode: the object | |
785 | * @name: attribute name | |
786 | * @buffer: where to put the result | |
251a2a95 | 787 | * @alloc: unused |
e114e473 CS |
788 | * |
789 | * Returns the size of the attribute or an error code | |
790 | */ | |
791 | static int smack_inode_getsecurity(const struct inode *inode, | |
792 | const char *name, void **buffer, | |
793 | bool alloc) | |
794 | { | |
795 | struct socket_smack *ssp; | |
796 | struct socket *sock; | |
797 | struct super_block *sbp; | |
798 | struct inode *ip = (struct inode *)inode; | |
799 | char *isp; | |
800 | int ilen; | |
801 | int rc = 0; | |
802 | ||
803 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
804 | isp = smk_of_inode(inode); | |
805 | ilen = strlen(isp) + 1; | |
806 | *buffer = isp; | |
807 | return ilen; | |
808 | } | |
809 | ||
810 | /* | |
811 | * The rest of the Smack xattrs are only on sockets. | |
812 | */ | |
813 | sbp = ip->i_sb; | |
814 | if (sbp->s_magic != SOCKFS_MAGIC) | |
815 | return -EOPNOTSUPP; | |
816 | ||
817 | sock = SOCKET_I(ip); | |
2e1d146a | 818 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
819 | return -EOPNOTSUPP; |
820 | ||
821 | ssp = sock->sk->sk_security; | |
822 | ||
823 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
824 | isp = ssp->smk_in; | |
825 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
826 | isp = ssp->smk_out; | |
827 | else | |
828 | return -EOPNOTSUPP; | |
829 | ||
830 | ilen = strlen(isp) + 1; | |
831 | if (rc == 0) { | |
832 | *buffer = isp; | |
833 | rc = ilen; | |
834 | } | |
835 | ||
836 | return rc; | |
837 | } | |
838 | ||
839 | ||
840 | /** | |
841 | * smack_inode_listsecurity - list the Smack attributes | |
842 | * @inode: the object | |
843 | * @buffer: where they go | |
844 | * @buffer_size: size of buffer | |
845 | * | |
846 | * Returns 0 on success, -EINVAL otherwise | |
847 | */ | |
848 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
849 | size_t buffer_size) | |
850 | { | |
851 | int len = strlen(XATTR_NAME_SMACK); | |
852 | ||
853 | if (buffer != NULL && len <= buffer_size) { | |
854 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
855 | return len; | |
856 | } | |
857 | return -EINVAL; | |
858 | } | |
859 | ||
d20bdda6 AD |
860 | /** |
861 | * smack_inode_getsecid - Extract inode's security id | |
862 | * @inode: inode to extract the info from | |
863 | * @secid: where result will be saved | |
864 | */ | |
865 | static void smack_inode_getsecid(const struct inode *inode, u32 *secid) | |
866 | { | |
867 | struct inode_smack *isp = inode->i_security; | |
868 | ||
869 | *secid = smack_to_secid(isp->smk_inode); | |
870 | } | |
871 | ||
e114e473 CS |
872 | /* |
873 | * File Hooks | |
874 | */ | |
875 | ||
876 | /** | |
877 | * smack_file_permission - Smack check on file operations | |
878 | * @file: unused | |
879 | * @mask: unused | |
880 | * | |
881 | * Returns 0 | |
882 | * | |
883 | * Should access checks be done on each read or write? | |
884 | * UNICOS and SELinux say yes. | |
885 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
886 | * | |
887 | * I'll say no for now. Smack does not do the frequent | |
888 | * label changing that SELinux does. | |
889 | */ | |
890 | static int smack_file_permission(struct file *file, int mask) | |
891 | { | |
892 | return 0; | |
893 | } | |
894 | ||
895 | /** | |
896 | * smack_file_alloc_security - assign a file security blob | |
897 | * @file: the object | |
898 | * | |
899 | * The security blob for a file is a pointer to the master | |
900 | * label list, so no allocation is done. | |
901 | * | |
902 | * Returns 0 | |
903 | */ | |
904 | static int smack_file_alloc_security(struct file *file) | |
905 | { | |
86a264ab | 906 | file->f_security = current_security(); |
e114e473 CS |
907 | return 0; |
908 | } | |
909 | ||
910 | /** | |
911 | * smack_file_free_security - clear a file security blob | |
912 | * @file: the object | |
913 | * | |
914 | * The security blob for a file is a pointer to the master | |
915 | * label list, so no memory is freed. | |
916 | */ | |
917 | static void smack_file_free_security(struct file *file) | |
918 | { | |
919 | file->f_security = NULL; | |
920 | } | |
921 | ||
922 | /** | |
923 | * smack_file_ioctl - Smack check on ioctls | |
924 | * @file: the object | |
925 | * @cmd: what to do | |
926 | * @arg: unused | |
927 | * | |
928 | * Relies heavily on the correct use of the ioctl command conventions. | |
929 | * | |
930 | * Returns 0 if allowed, error code otherwise | |
931 | */ | |
932 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
933 | unsigned long arg) | |
934 | { | |
935 | int rc = 0; | |
ecfcc53f EB |
936 | struct smk_audit_info ad; |
937 | ||
938 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
939 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
940 | |
941 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
ecfcc53f | 942 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
943 | |
944 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
ecfcc53f | 945 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
946 | |
947 | return rc; | |
948 | } | |
949 | ||
950 | /** | |
951 | * smack_file_lock - Smack check on file locking | |
952 | * @file: the object | |
251a2a95 | 953 | * @cmd: unused |
e114e473 CS |
954 | * |
955 | * Returns 0 if current has write access, error code otherwise | |
956 | */ | |
957 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
958 | { | |
ecfcc53f EB |
959 | struct smk_audit_info ad; |
960 | ||
961 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); | |
962 | smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); | |
963 | return smk_curacc(file->f_security, MAY_WRITE, &ad); | |
e114e473 CS |
964 | } |
965 | ||
966 | /** | |
967 | * smack_file_fcntl - Smack check on fcntl | |
968 | * @file: the object | |
969 | * @cmd: what action to check | |
970 | * @arg: unused | |
971 | * | |
972 | * Returns 0 if current has access, error code otherwise | |
973 | */ | |
974 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
975 | unsigned long arg) | |
976 | { | |
ecfcc53f | 977 | struct smk_audit_info ad; |
e114e473 CS |
978 | int rc; |
979 | ||
ecfcc53f EB |
980 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); |
981 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
982 | ||
e114e473 CS |
983 | switch (cmd) { |
984 | case F_DUPFD: | |
985 | case F_GETFD: | |
986 | case F_GETFL: | |
987 | case F_GETLK: | |
988 | case F_GETOWN: | |
989 | case F_GETSIG: | |
ecfcc53f | 990 | rc = smk_curacc(file->f_security, MAY_READ, &ad); |
e114e473 CS |
991 | break; |
992 | case F_SETFD: | |
993 | case F_SETFL: | |
994 | case F_SETLK: | |
995 | case F_SETLKW: | |
996 | case F_SETOWN: | |
997 | case F_SETSIG: | |
ecfcc53f | 998 | rc = smk_curacc(file->f_security, MAY_WRITE, &ad); |
e114e473 CS |
999 | break; |
1000 | default: | |
ecfcc53f | 1001 | rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); |
e114e473 CS |
1002 | } |
1003 | ||
1004 | return rc; | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * smack_file_set_fowner - set the file security blob value | |
1009 | * @file: object in question | |
1010 | * | |
1011 | * Returns 0 | |
1012 | * Further research may be required on this one. | |
1013 | */ | |
1014 | static int smack_file_set_fowner(struct file *file) | |
1015 | { | |
86a264ab | 1016 | file->f_security = current_security(); |
e114e473 CS |
1017 | return 0; |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * smack_file_send_sigiotask - Smack on sigio | |
1022 | * @tsk: The target task | |
1023 | * @fown: the object the signal come from | |
1024 | * @signum: unused | |
1025 | * | |
1026 | * Allow a privileged task to get signals even if it shouldn't | |
1027 | * | |
1028 | * Returns 0 if a subject with the object's smack could | |
1029 | * write to the task, an error code otherwise. | |
1030 | */ | |
1031 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1032 | struct fown_struct *fown, int signum) | |
1033 | { | |
1034 | struct file *file; | |
1035 | int rc; | |
ecfcc53f EB |
1036 | char *tsp = tsk->cred->security; |
1037 | struct smk_audit_info ad; | |
e114e473 CS |
1038 | |
1039 | /* | |
1040 | * struct fown_struct is never outside the context of a struct file | |
1041 | */ | |
1042 | file = container_of(fown, struct file, f_owner); | |
ecfcc53f EB |
1043 | /* we don't log here as rc can be overriden */ |
1044 | rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); | |
5cd9c58f | 1045 | if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1046 | rc = 0; |
1047 | ||
1048 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1049 | smk_ad_setfield_u_tsk(&ad, tsk); | |
1050 | smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1051 | return rc; |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * smack_file_receive - Smack file receive check | |
1056 | * @file: the object | |
1057 | * | |
1058 | * Returns 0 if current has access, error code otherwise | |
1059 | */ | |
1060 | static int smack_file_receive(struct file *file) | |
1061 | { | |
1062 | int may = 0; | |
ecfcc53f | 1063 | struct smk_audit_info ad; |
e114e473 | 1064 | |
ecfcc53f EB |
1065 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
1066 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
e114e473 CS |
1067 | /* |
1068 | * This code relies on bitmasks. | |
1069 | */ | |
1070 | if (file->f_mode & FMODE_READ) | |
1071 | may = MAY_READ; | |
1072 | if (file->f_mode & FMODE_WRITE) | |
1073 | may |= MAY_WRITE; | |
1074 | ||
ecfcc53f | 1075 | return smk_curacc(file->f_security, may, &ad); |
e114e473 CS |
1076 | } |
1077 | ||
1078 | /* | |
1079 | * Task hooks | |
1080 | */ | |
1081 | ||
e114e473 | 1082 | /** |
f1752eec DH |
1083 | * smack_cred_free - "free" task-level security credentials |
1084 | * @cred: the credentials in question | |
e114e473 CS |
1085 | * |
1086 | * Smack isn't using copies of blobs. Everyone | |
1087 | * points to an immutable list. The blobs never go away. | |
1088 | * There is no leak here. | |
1089 | */ | |
f1752eec | 1090 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1091 | { |
f1752eec | 1092 | cred->security = NULL; |
e114e473 CS |
1093 | } |
1094 | ||
d84f4f99 DH |
1095 | /** |
1096 | * smack_cred_prepare - prepare new set of credentials for modification | |
1097 | * @new: the new credentials | |
1098 | * @old: the original credentials | |
1099 | * @gfp: the atomicity of any memory allocations | |
1100 | * | |
1101 | * Prepare a new set of credentials for modification. | |
1102 | */ | |
1103 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1104 | gfp_t gfp) | |
1105 | { | |
1106 | new->security = old->security; | |
1107 | return 0; | |
1108 | } | |
1109 | ||
251a2a95 RD |
1110 | /** |
1111 | * smack_cred_commit - commit new credentials | |
d84f4f99 DH |
1112 | * @new: the new credentials |
1113 | * @old: the original credentials | |
1114 | */ | |
1115 | static void smack_cred_commit(struct cred *new, const struct cred *old) | |
1116 | { | |
1117 | } | |
1118 | ||
3a3b7ce9 DH |
1119 | /** |
1120 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
1121 | * @new: points to the set of credentials to be modified. |
1122 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
1123 | * |
1124 | * Set the security data for a kernel service. | |
1125 | */ | |
1126 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
1127 | { | |
1128 | char *smack = smack_from_secid(secid); | |
1129 | ||
1130 | if (smack == NULL) | |
1131 | return -EINVAL; | |
1132 | ||
1133 | new->security = smack; | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
1139 | * @new: points to the set of credentials to be modified |
1140 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
1141 | * |
1142 | * Set the file creation context in a set of credentials to the same | |
1143 | * as the objective context of the specified inode | |
1144 | */ | |
1145 | static int smack_kernel_create_files_as(struct cred *new, | |
1146 | struct inode *inode) | |
1147 | { | |
1148 | struct inode_smack *isp = inode->i_security; | |
1149 | ||
1150 | new->security = isp->smk_inode; | |
1151 | return 0; | |
1152 | } | |
1153 | ||
ecfcc53f EB |
1154 | /** |
1155 | * smk_curacc_on_task - helper to log task related access | |
1156 | * @p: the task object | |
1157 | * @access : the access requested | |
1158 | * | |
1159 | * Return 0 if access is permitted | |
1160 | */ | |
1161 | static int smk_curacc_on_task(struct task_struct *p, int access) | |
1162 | { | |
1163 | struct smk_audit_info ad; | |
1164 | ||
1165 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1166 | smk_ad_setfield_u_tsk(&ad, p); | |
1167 | return smk_curacc(task_security(p), access, &ad); | |
1168 | } | |
1169 | ||
e114e473 CS |
1170 | /** |
1171 | * smack_task_setpgid - Smack check on setting pgid | |
1172 | * @p: the task object | |
1173 | * @pgid: unused | |
1174 | * | |
1175 | * Return 0 if write access is permitted | |
1176 | */ | |
1177 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
1178 | { | |
ecfcc53f | 1179 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1180 | } |
1181 | ||
1182 | /** | |
1183 | * smack_task_getpgid - Smack access check for getpgid | |
1184 | * @p: the object task | |
1185 | * | |
1186 | * Returns 0 if current can read the object task, error code otherwise | |
1187 | */ | |
1188 | static int smack_task_getpgid(struct task_struct *p) | |
1189 | { | |
ecfcc53f | 1190 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1191 | } |
1192 | ||
1193 | /** | |
1194 | * smack_task_getsid - Smack access check for getsid | |
1195 | * @p: the object task | |
1196 | * | |
1197 | * Returns 0 if current can read the object task, error code otherwise | |
1198 | */ | |
1199 | static int smack_task_getsid(struct task_struct *p) | |
1200 | { | |
ecfcc53f | 1201 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1202 | } |
1203 | ||
1204 | /** | |
1205 | * smack_task_getsecid - get the secid of the task | |
1206 | * @p: the object task | |
1207 | * @secid: where to put the result | |
1208 | * | |
1209 | * Sets the secid to contain a u32 version of the smack label. | |
1210 | */ | |
1211 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1212 | { | |
c69e8d9c | 1213 | *secid = smack_to_secid(task_security(p)); |
e114e473 CS |
1214 | } |
1215 | ||
1216 | /** | |
1217 | * smack_task_setnice - Smack check on setting nice | |
1218 | * @p: the task object | |
1219 | * @nice: unused | |
1220 | * | |
1221 | * Return 0 if write access is permitted | |
1222 | */ | |
1223 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1224 | { | |
bcdca225 CS |
1225 | int rc; |
1226 | ||
1227 | rc = cap_task_setnice(p, nice); | |
1228 | if (rc == 0) | |
ecfcc53f | 1229 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1230 | return rc; |
e114e473 CS |
1231 | } |
1232 | ||
1233 | /** | |
1234 | * smack_task_setioprio - Smack check on setting ioprio | |
1235 | * @p: the task object | |
1236 | * @ioprio: unused | |
1237 | * | |
1238 | * Return 0 if write access is permitted | |
1239 | */ | |
1240 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1241 | { | |
bcdca225 CS |
1242 | int rc; |
1243 | ||
1244 | rc = cap_task_setioprio(p, ioprio); | |
1245 | if (rc == 0) | |
ecfcc53f | 1246 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1247 | return rc; |
e114e473 CS |
1248 | } |
1249 | ||
1250 | /** | |
1251 | * smack_task_getioprio - Smack check on reading ioprio | |
1252 | * @p: the task object | |
1253 | * | |
1254 | * Return 0 if read access is permitted | |
1255 | */ | |
1256 | static int smack_task_getioprio(struct task_struct *p) | |
1257 | { | |
ecfcc53f | 1258 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1259 | } |
1260 | ||
1261 | /** | |
1262 | * smack_task_setscheduler - Smack check on setting scheduler | |
1263 | * @p: the task object | |
1264 | * @policy: unused | |
1265 | * @lp: unused | |
1266 | * | |
1267 | * Return 0 if read access is permitted | |
1268 | */ | |
1269 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1270 | struct sched_param *lp) | |
1271 | { | |
bcdca225 CS |
1272 | int rc; |
1273 | ||
1274 | rc = cap_task_setscheduler(p, policy, lp); | |
1275 | if (rc == 0) | |
ecfcc53f | 1276 | rc = smk_curacc_on_task(p, MAY_WRITE); |
bcdca225 | 1277 | return rc; |
e114e473 CS |
1278 | } |
1279 | ||
1280 | /** | |
1281 | * smack_task_getscheduler - Smack check on reading scheduler | |
1282 | * @p: the task object | |
1283 | * | |
1284 | * Return 0 if read access is permitted | |
1285 | */ | |
1286 | static int smack_task_getscheduler(struct task_struct *p) | |
1287 | { | |
ecfcc53f | 1288 | return smk_curacc_on_task(p, MAY_READ); |
e114e473 CS |
1289 | } |
1290 | ||
1291 | /** | |
1292 | * smack_task_movememory - Smack check on moving memory | |
1293 | * @p: the task object | |
1294 | * | |
1295 | * Return 0 if write access is permitted | |
1296 | */ | |
1297 | static int smack_task_movememory(struct task_struct *p) | |
1298 | { | |
ecfcc53f | 1299 | return smk_curacc_on_task(p, MAY_WRITE); |
e114e473 CS |
1300 | } |
1301 | ||
1302 | /** | |
1303 | * smack_task_kill - Smack check on signal delivery | |
1304 | * @p: the task object | |
1305 | * @info: unused | |
1306 | * @sig: unused | |
1307 | * @secid: identifies the smack to use in lieu of current's | |
1308 | * | |
1309 | * Return 0 if write access is permitted | |
1310 | * | |
1311 | * The secid behavior is an artifact of an SELinux hack | |
1312 | * in the USB code. Someday it may go away. | |
1313 | */ | |
1314 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1315 | int sig, u32 secid) | |
1316 | { | |
ecfcc53f EB |
1317 | struct smk_audit_info ad; |
1318 | ||
1319 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1320 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
1321 | /* |
1322 | * Sending a signal requires that the sender | |
1323 | * can write the receiver. | |
1324 | */ | |
1325 | if (secid == 0) | |
ecfcc53f | 1326 | return smk_curacc(task_security(p), MAY_WRITE, &ad); |
e114e473 CS |
1327 | /* |
1328 | * If the secid isn't 0 we're dealing with some USB IO | |
1329 | * specific behavior. This is not clean. For one thing | |
1330 | * we can't take privilege into account. | |
1331 | */ | |
ecfcc53f EB |
1332 | return smk_access(smack_from_secid(secid), task_security(p), |
1333 | MAY_WRITE, &ad); | |
e114e473 CS |
1334 | } |
1335 | ||
1336 | /** | |
1337 | * smack_task_wait - Smack access check for waiting | |
1338 | * @p: task to wait for | |
1339 | * | |
1340 | * Returns 0 if current can wait for p, error code otherwise | |
1341 | */ | |
1342 | static int smack_task_wait(struct task_struct *p) | |
1343 | { | |
ecfcc53f EB |
1344 | struct smk_audit_info ad; |
1345 | char *sp = current_security(); | |
1346 | char *tsp = task_security(p); | |
e114e473 CS |
1347 | int rc; |
1348 | ||
ecfcc53f EB |
1349 | /* we don't log here, we can be overriden */ |
1350 | rc = smk_access(sp, tsp, MAY_WRITE, NULL); | |
e114e473 | 1351 | if (rc == 0) |
ecfcc53f | 1352 | goto out_log; |
e114e473 CS |
1353 | |
1354 | /* | |
1355 | * Allow the operation to succeed if either task | |
1356 | * has privilege to perform operations that might | |
1357 | * account for the smack labels having gotten to | |
1358 | * be different in the first place. | |
1359 | * | |
5cd9c58f | 1360 | * This breaks the strict subject/object access |
e114e473 CS |
1361 | * control ideal, taking the object's privilege |
1362 | * state into account in the decision as well as | |
1363 | * the smack value. | |
1364 | */ | |
5cd9c58f | 1365 | if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) |
ecfcc53f EB |
1366 | rc = 0; |
1367 | /* we log only if we didn't get overriden */ | |
1368 | out_log: | |
1369 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1370 | smk_ad_setfield_u_tsk(&ad, p); | |
1371 | smack_log(sp, tsp, MAY_WRITE, rc, &ad); | |
e114e473 CS |
1372 | return rc; |
1373 | } | |
1374 | ||
1375 | /** | |
1376 | * smack_task_to_inode - copy task smack into the inode blob | |
1377 | * @p: task to copy from | |
251a2a95 | 1378 | * @inode: inode to copy to |
e114e473 CS |
1379 | * |
1380 | * Sets the smack pointer in the inode security blob | |
1381 | */ | |
1382 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1383 | { | |
1384 | struct inode_smack *isp = inode->i_security; | |
c69e8d9c | 1385 | isp->smk_inode = task_security(p); |
e114e473 CS |
1386 | } |
1387 | ||
1388 | /* | |
1389 | * Socket hooks. | |
1390 | */ | |
1391 | ||
1392 | /** | |
1393 | * smack_sk_alloc_security - Allocate a socket blob | |
1394 | * @sk: the socket | |
1395 | * @family: unused | |
251a2a95 | 1396 | * @gfp_flags: memory allocation flags |
e114e473 CS |
1397 | * |
1398 | * Assign Smack pointers to current | |
1399 | * | |
1400 | * Returns 0 on success, -ENOMEM is there's no memory | |
1401 | */ | |
1402 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1403 | { | |
86a264ab | 1404 | char *csp = current_security(); |
e114e473 CS |
1405 | struct socket_smack *ssp; |
1406 | ||
1407 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1408 | if (ssp == NULL) | |
1409 | return -ENOMEM; | |
1410 | ||
1411 | ssp->smk_in = csp; | |
1412 | ssp->smk_out = csp; | |
1413 | ssp->smk_packet[0] = '\0'; | |
1414 | ||
1415 | sk->sk_security = ssp; | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * smack_sk_free_security - Free a socket blob | |
1422 | * @sk: the socket | |
1423 | * | |
1424 | * Clears the blob pointer | |
1425 | */ | |
1426 | static void smack_sk_free_security(struct sock *sk) | |
1427 | { | |
1428 | kfree(sk->sk_security); | |
1429 | } | |
1430 | ||
07feee8f PM |
1431 | /** |
1432 | * smack_host_label - check host based restrictions | |
1433 | * @sip: the object end | |
1434 | * | |
1435 | * looks for host based access restrictions | |
1436 | * | |
1437 | * This version will only be appropriate for really small sets of single label | |
1438 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
1439 | * taken before calling this function. | |
1440 | * | |
1441 | * Returns the label of the far end or NULL if it's not special. | |
1442 | */ | |
1443 | static char *smack_host_label(struct sockaddr_in *sip) | |
1444 | { | |
1445 | struct smk_netlbladdr *snp; | |
1446 | struct in_addr *siap = &sip->sin_addr; | |
1447 | ||
1448 | if (siap->s_addr == 0) | |
1449 | return NULL; | |
1450 | ||
1451 | list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) | |
1452 | /* | |
1453 | * we break after finding the first match because | |
1454 | * the list is sorted from longest to shortest mask | |
1455 | * so we have found the most specific match | |
1456 | */ | |
1457 | if ((&snp->smk_host.sin_addr)->s_addr == | |
4303154e EB |
1458 | (siap->s_addr & (&snp->smk_mask)->s_addr)) { |
1459 | /* we have found the special CIPSO option */ | |
1460 | if (snp->smk_label == smack_cipso_option) | |
1461 | return NULL; | |
07feee8f | 1462 | return snp->smk_label; |
4303154e | 1463 | } |
07feee8f PM |
1464 | |
1465 | return NULL; | |
1466 | } | |
1467 | ||
e114e473 CS |
1468 | /** |
1469 | * smack_set_catset - convert a capset to netlabel mls categories | |
1470 | * @catset: the Smack categories | |
1471 | * @sap: where to put the netlabel categories | |
1472 | * | |
1473 | * Allocates and fills attr.mls.cat | |
1474 | */ | |
1475 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1476 | { | |
1477 | unsigned char *cp; | |
1478 | unsigned char m; | |
1479 | int cat; | |
1480 | int rc; | |
1481 | int byte; | |
1482 | ||
c60264c4 | 1483 | if (!catset) |
e114e473 CS |
1484 | return; |
1485 | ||
1486 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1487 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1488 | sap->attr.mls.cat->startbit = 0; | |
1489 | ||
1490 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1491 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1492 | if ((m & *cp) == 0) | |
1493 | continue; | |
1494 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1495 | cat, GFP_ATOMIC); | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | /** | |
1500 | * smack_to_secattr - fill a secattr from a smack value | |
1501 | * @smack: the smack value | |
1502 | * @nlsp: where the result goes | |
1503 | * | |
1504 | * Casey says that CIPSO is good enough for now. | |
1505 | * It can be used to effect. | |
1506 | * It can also be abused to effect when necessary. | |
1507 | * Appologies to the TSIG group in general and GW in particular. | |
1508 | */ | |
1509 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1510 | { | |
1511 | struct smack_cipso cipso; | |
1512 | int rc; | |
1513 | ||
6d3dc07c CS |
1514 | nlsp->domain = smack; |
1515 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 | 1516 | |
6d3dc07c CS |
1517 | rc = smack_to_cipso(smack, &cipso); |
1518 | if (rc == 0) { | |
1519 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1520 | smack_set_catset(cipso.smk_catset, nlsp); | |
1521 | } else { | |
1522 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1523 | smack_set_catset(smack, nlsp); | |
e114e473 CS |
1524 | } |
1525 | } | |
1526 | ||
1527 | /** | |
1528 | * smack_netlabel - Set the secattr on a socket | |
1529 | * @sk: the socket | |
6d3dc07c | 1530 | * @labeled: socket label scheme |
e114e473 CS |
1531 | * |
1532 | * Convert the outbound smack value (smk_out) to a | |
1533 | * secattr and attach it to the socket. | |
1534 | * | |
1535 | * Returns 0 on success or an error code | |
1536 | */ | |
6d3dc07c | 1537 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 1538 | { |
07feee8f | 1539 | struct socket_smack *ssp = sk->sk_security; |
e114e473 | 1540 | struct netlbl_lsm_secattr secattr; |
6d3dc07c | 1541 | int rc = 0; |
e114e473 | 1542 | |
6d3dc07c CS |
1543 | /* |
1544 | * Usually the netlabel code will handle changing the | |
1545 | * packet labeling based on the label. | |
1546 | * The case of a single label host is different, because | |
1547 | * a single label host should never get a labeled packet | |
1548 | * even though the label is usually associated with a packet | |
1549 | * label. | |
1550 | */ | |
1551 | local_bh_disable(); | |
1552 | bh_lock_sock_nested(sk); | |
1553 | ||
1554 | if (ssp->smk_out == smack_net_ambient || | |
1555 | labeled == SMACK_UNLABELED_SOCKET) | |
1556 | netlbl_sock_delattr(sk); | |
1557 | else { | |
1558 | netlbl_secattr_init(&secattr); | |
1559 | smack_to_secattr(ssp->smk_out, &secattr); | |
389fb800 | 1560 | rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); |
6d3dc07c CS |
1561 | netlbl_secattr_destroy(&secattr); |
1562 | } | |
1563 | ||
1564 | bh_unlock_sock(sk); | |
1565 | local_bh_enable(); | |
4bc87e62 | 1566 | |
e114e473 CS |
1567 | return rc; |
1568 | } | |
1569 | ||
07feee8f PM |
1570 | /** |
1571 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
1572 | * @sk: the socket | |
1573 | * @sap: the destination address | |
1574 | * | |
1575 | * Set the correct secattr for the given socket based on the destination | |
1576 | * address and perform any outbound access checks needed. | |
1577 | * | |
1578 | * Returns 0 on success or an error code. | |
1579 | * | |
1580 | */ | |
1581 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
1582 | { | |
1583 | int rc; | |
1584 | int sk_lbl; | |
1585 | char *hostsp; | |
1586 | struct socket_smack *ssp = sk->sk_security; | |
ecfcc53f | 1587 | struct smk_audit_info ad; |
07feee8f PM |
1588 | |
1589 | rcu_read_lock(); | |
1590 | hostsp = smack_host_label(sap); | |
1591 | if (hostsp != NULL) { | |
1592 | sk_lbl = SMACK_UNLABELED_SOCKET; | |
ecfcc53f EB |
1593 | #ifdef CONFIG_AUDIT |
1594 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
1595 | ad.a.u.net.family = sap->sin_family; | |
1596 | ad.a.u.net.dport = sap->sin_port; | |
1597 | ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; | |
1598 | #endif | |
1599 | rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); | |
07feee8f PM |
1600 | } else { |
1601 | sk_lbl = SMACK_CIPSO_SOCKET; | |
1602 | rc = 0; | |
1603 | } | |
1604 | rcu_read_unlock(); | |
1605 | if (rc != 0) | |
1606 | return rc; | |
1607 | ||
1608 | return smack_netlabel(sk, sk_lbl); | |
1609 | } | |
1610 | ||
e114e473 CS |
1611 | /** |
1612 | * smack_inode_setsecurity - set smack xattrs | |
1613 | * @inode: the object | |
1614 | * @name: attribute name | |
1615 | * @value: attribute value | |
1616 | * @size: size of the attribute | |
1617 | * @flags: unused | |
1618 | * | |
1619 | * Sets the named attribute in the appropriate blob | |
1620 | * | |
1621 | * Returns 0 on success, or an error code | |
1622 | */ | |
1623 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1624 | const void *value, size_t size, int flags) | |
1625 | { | |
1626 | char *sp; | |
1627 | struct inode_smack *nsp = inode->i_security; | |
1628 | struct socket_smack *ssp; | |
1629 | struct socket *sock; | |
4bc87e62 | 1630 | int rc = 0; |
e114e473 | 1631 | |
4303154e | 1632 | if (value == NULL || size > SMK_LABELLEN || size == 0) |
e114e473 CS |
1633 | return -EACCES; |
1634 | ||
1635 | sp = smk_import(value, size); | |
1636 | if (sp == NULL) | |
1637 | return -EINVAL; | |
1638 | ||
1639 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1640 | nsp->smk_inode = sp; | |
1641 | return 0; | |
1642 | } | |
1643 | /* | |
1644 | * The rest of the Smack xattrs are only on sockets. | |
1645 | */ | |
1646 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1647 | return -EOPNOTSUPP; | |
1648 | ||
1649 | sock = SOCKET_I(inode); | |
2e1d146a | 1650 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1651 | return -EOPNOTSUPP; |
1652 | ||
1653 | ssp = sock->sk->sk_security; | |
1654 | ||
1655 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1656 | ssp->smk_in = sp; | |
1657 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1658 | ssp->smk_out = sp; | |
6d3dc07c | 1659 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
4bc87e62 CS |
1660 | if (rc != 0) |
1661 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1662 | __func__, -rc); | |
e114e473 CS |
1663 | } else |
1664 | return -EOPNOTSUPP; | |
1665 | ||
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | /** | |
1670 | * smack_socket_post_create - finish socket setup | |
1671 | * @sock: the socket | |
1672 | * @family: protocol family | |
1673 | * @type: unused | |
1674 | * @protocol: unused | |
1675 | * @kern: unused | |
1676 | * | |
1677 | * Sets the netlabel information on the socket | |
1678 | * | |
1679 | * Returns 0 on success, and error code otherwise | |
1680 | */ | |
1681 | static int smack_socket_post_create(struct socket *sock, int family, | |
1682 | int type, int protocol, int kern) | |
1683 | { | |
2e1d146a | 1684 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1685 | return 0; |
1686 | /* | |
1687 | * Set the outbound netlbl. | |
1688 | */ | |
6d3dc07c CS |
1689 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
1690 | } | |
1691 | ||
6d3dc07c CS |
1692 | /** |
1693 | * smack_socket_connect - connect access check | |
1694 | * @sock: the socket | |
1695 | * @sap: the other end | |
1696 | * @addrlen: size of sap | |
1697 | * | |
1698 | * Verifies that a connection may be possible | |
1699 | * | |
1700 | * Returns 0 on success, and error code otherwise | |
1701 | */ | |
1702 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
1703 | int addrlen) | |
1704 | { | |
6d3dc07c CS |
1705 | if (sock->sk == NULL || sock->sk->sk_family != PF_INET) |
1706 | return 0; | |
6d3dc07c CS |
1707 | if (addrlen < sizeof(struct sockaddr_in)) |
1708 | return -EINVAL; | |
1709 | ||
07feee8f | 1710 | return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); |
e114e473 CS |
1711 | } |
1712 | ||
1713 | /** | |
1714 | * smack_flags_to_may - convert S_ to MAY_ values | |
1715 | * @flags: the S_ value | |
1716 | * | |
1717 | * Returns the equivalent MAY_ value | |
1718 | */ | |
1719 | static int smack_flags_to_may(int flags) | |
1720 | { | |
1721 | int may = 0; | |
1722 | ||
1723 | if (flags & S_IRUGO) | |
1724 | may |= MAY_READ; | |
1725 | if (flags & S_IWUGO) | |
1726 | may |= MAY_WRITE; | |
1727 | if (flags & S_IXUGO) | |
1728 | may |= MAY_EXEC; | |
1729 | ||
1730 | return may; | |
1731 | } | |
1732 | ||
1733 | /** | |
1734 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1735 | * @msg: the object | |
1736 | * | |
1737 | * Returns 0 | |
1738 | */ | |
1739 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1740 | { | |
86a264ab | 1741 | msg->security = current_security(); |
e114e473 CS |
1742 | return 0; |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1747 | * @msg: the object | |
1748 | * | |
1749 | * Clears the blob pointer | |
1750 | */ | |
1751 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1752 | { | |
1753 | msg->security = NULL; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * smack_of_shm - the smack pointer for the shm | |
1758 | * @shp: the object | |
1759 | * | |
1760 | * Returns a pointer to the smack value | |
1761 | */ | |
1762 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1763 | { | |
1764 | return (char *)shp->shm_perm.security; | |
1765 | } | |
1766 | ||
1767 | /** | |
1768 | * smack_shm_alloc_security - Set the security blob for shm | |
1769 | * @shp: the object | |
1770 | * | |
1771 | * Returns 0 | |
1772 | */ | |
1773 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1774 | { | |
1775 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1776 | ||
86a264ab | 1777 | isp->security = current_security(); |
e114e473 CS |
1778 | return 0; |
1779 | } | |
1780 | ||
1781 | /** | |
1782 | * smack_shm_free_security - Clear the security blob for shm | |
1783 | * @shp: the object | |
1784 | * | |
1785 | * Clears the blob pointer | |
1786 | */ | |
1787 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1788 | { | |
1789 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1790 | ||
1791 | isp->security = NULL; | |
1792 | } | |
1793 | ||
ecfcc53f EB |
1794 | /** |
1795 | * smk_curacc_shm : check if current has access on shm | |
1796 | * @shp : the object | |
1797 | * @access : access requested | |
1798 | * | |
1799 | * Returns 0 if current has the requested access, error code otherwise | |
1800 | */ | |
1801 | static int smk_curacc_shm(struct shmid_kernel *shp, int access) | |
1802 | { | |
1803 | char *ssp = smack_of_shm(shp); | |
1804 | struct smk_audit_info ad; | |
1805 | ||
1806 | #ifdef CONFIG_AUDIT | |
1807 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1808 | ad.a.u.ipc_id = shp->shm_perm.id; | |
1809 | #endif | |
1810 | return smk_curacc(ssp, access, &ad); | |
1811 | } | |
1812 | ||
e114e473 CS |
1813 | /** |
1814 | * smack_shm_associate - Smack access check for shm | |
1815 | * @shp: the object | |
1816 | * @shmflg: access requested | |
1817 | * | |
1818 | * Returns 0 if current has the requested access, error code otherwise | |
1819 | */ | |
1820 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1821 | { | |
e114e473 CS |
1822 | int may; |
1823 | ||
1824 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1825 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1826 | } |
1827 | ||
1828 | /** | |
1829 | * smack_shm_shmctl - Smack access check for shm | |
1830 | * @shp: the object | |
1831 | * @cmd: what it wants to do | |
1832 | * | |
1833 | * Returns 0 if current has the requested access, error code otherwise | |
1834 | */ | |
1835 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1836 | { | |
e114e473 CS |
1837 | int may; |
1838 | ||
1839 | switch (cmd) { | |
1840 | case IPC_STAT: | |
1841 | case SHM_STAT: | |
1842 | may = MAY_READ; | |
1843 | break; | |
1844 | case IPC_SET: | |
1845 | case SHM_LOCK: | |
1846 | case SHM_UNLOCK: | |
1847 | case IPC_RMID: | |
1848 | may = MAY_READWRITE; | |
1849 | break; | |
1850 | case IPC_INFO: | |
1851 | case SHM_INFO: | |
1852 | /* | |
1853 | * System level information. | |
1854 | */ | |
1855 | return 0; | |
1856 | default: | |
1857 | return -EINVAL; | |
1858 | } | |
ecfcc53f | 1859 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1860 | } |
1861 | ||
1862 | /** | |
1863 | * smack_shm_shmat - Smack access for shmat | |
1864 | * @shp: the object | |
1865 | * @shmaddr: unused | |
1866 | * @shmflg: access requested | |
1867 | * | |
1868 | * Returns 0 if current has the requested access, error code otherwise | |
1869 | */ | |
1870 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1871 | int shmflg) | |
1872 | { | |
e114e473 CS |
1873 | int may; |
1874 | ||
1875 | may = smack_flags_to_may(shmflg); | |
ecfcc53f | 1876 | return smk_curacc_shm(shp, may); |
e114e473 CS |
1877 | } |
1878 | ||
1879 | /** | |
1880 | * smack_of_sem - the smack pointer for the sem | |
1881 | * @sma: the object | |
1882 | * | |
1883 | * Returns a pointer to the smack value | |
1884 | */ | |
1885 | static char *smack_of_sem(struct sem_array *sma) | |
1886 | { | |
1887 | return (char *)sma->sem_perm.security; | |
1888 | } | |
1889 | ||
1890 | /** | |
1891 | * smack_sem_alloc_security - Set the security blob for sem | |
1892 | * @sma: the object | |
1893 | * | |
1894 | * Returns 0 | |
1895 | */ | |
1896 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1897 | { | |
1898 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1899 | ||
86a264ab | 1900 | isp->security = current_security(); |
e114e473 CS |
1901 | return 0; |
1902 | } | |
1903 | ||
1904 | /** | |
1905 | * smack_sem_free_security - Clear the security blob for sem | |
1906 | * @sma: the object | |
1907 | * | |
1908 | * Clears the blob pointer | |
1909 | */ | |
1910 | static void smack_sem_free_security(struct sem_array *sma) | |
1911 | { | |
1912 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1913 | ||
1914 | isp->security = NULL; | |
1915 | } | |
1916 | ||
ecfcc53f EB |
1917 | /** |
1918 | * smk_curacc_sem : check if current has access on sem | |
1919 | * @sma : the object | |
1920 | * @access : access requested | |
1921 | * | |
1922 | * Returns 0 if current has the requested access, error code otherwise | |
1923 | */ | |
1924 | static int smk_curacc_sem(struct sem_array *sma, int access) | |
1925 | { | |
1926 | char *ssp = smack_of_sem(sma); | |
1927 | struct smk_audit_info ad; | |
1928 | ||
1929 | #ifdef CONFIG_AUDIT | |
1930 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
1931 | ad.a.u.ipc_id = sma->sem_perm.id; | |
1932 | #endif | |
1933 | return smk_curacc(ssp, access, &ad); | |
1934 | } | |
1935 | ||
e114e473 CS |
1936 | /** |
1937 | * smack_sem_associate - Smack access check for sem | |
1938 | * @sma: the object | |
1939 | * @semflg: access requested | |
1940 | * | |
1941 | * Returns 0 if current has the requested access, error code otherwise | |
1942 | */ | |
1943 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1944 | { | |
e114e473 CS |
1945 | int may; |
1946 | ||
1947 | may = smack_flags_to_may(semflg); | |
ecfcc53f | 1948 | return smk_curacc_sem(sma, may); |
e114e473 CS |
1949 | } |
1950 | ||
1951 | /** | |
1952 | * smack_sem_shmctl - Smack access check for sem | |
1953 | * @sma: the object | |
1954 | * @cmd: what it wants to do | |
1955 | * | |
1956 | * Returns 0 if current has the requested access, error code otherwise | |
1957 | */ | |
1958 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1959 | { | |
e114e473 CS |
1960 | int may; |
1961 | ||
1962 | switch (cmd) { | |
1963 | case GETPID: | |
1964 | case GETNCNT: | |
1965 | case GETZCNT: | |
1966 | case GETVAL: | |
1967 | case GETALL: | |
1968 | case IPC_STAT: | |
1969 | case SEM_STAT: | |
1970 | may = MAY_READ; | |
1971 | break; | |
1972 | case SETVAL: | |
1973 | case SETALL: | |
1974 | case IPC_RMID: | |
1975 | case IPC_SET: | |
1976 | may = MAY_READWRITE; | |
1977 | break; | |
1978 | case IPC_INFO: | |
1979 | case SEM_INFO: | |
1980 | /* | |
1981 | * System level information | |
1982 | */ | |
1983 | return 0; | |
1984 | default: | |
1985 | return -EINVAL; | |
1986 | } | |
1987 | ||
ecfcc53f | 1988 | return smk_curacc_sem(sma, may); |
e114e473 CS |
1989 | } |
1990 | ||
1991 | /** | |
1992 | * smack_sem_semop - Smack checks of semaphore operations | |
1993 | * @sma: the object | |
1994 | * @sops: unused | |
1995 | * @nsops: unused | |
1996 | * @alter: unused | |
1997 | * | |
1998 | * Treated as read and write in all cases. | |
1999 | * | |
2000 | * Returns 0 if access is allowed, error code otherwise | |
2001 | */ | |
2002 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
2003 | unsigned nsops, int alter) | |
2004 | { | |
ecfcc53f | 2005 | return smk_curacc_sem(sma, MAY_READWRITE); |
e114e473 CS |
2006 | } |
2007 | ||
2008 | /** | |
2009 | * smack_msg_alloc_security - Set the security blob for msg | |
2010 | * @msq: the object | |
2011 | * | |
2012 | * Returns 0 | |
2013 | */ | |
2014 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
2015 | { | |
2016 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2017 | ||
86a264ab | 2018 | kisp->security = current_security(); |
e114e473 CS |
2019 | return 0; |
2020 | } | |
2021 | ||
2022 | /** | |
2023 | * smack_msg_free_security - Clear the security blob for msg | |
2024 | * @msq: the object | |
2025 | * | |
2026 | * Clears the blob pointer | |
2027 | */ | |
2028 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
2029 | { | |
2030 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
2031 | ||
2032 | kisp->security = NULL; | |
2033 | } | |
2034 | ||
2035 | /** | |
2036 | * smack_of_msq - the smack pointer for the msq | |
2037 | * @msq: the object | |
2038 | * | |
2039 | * Returns a pointer to the smack value | |
2040 | */ | |
2041 | static char *smack_of_msq(struct msg_queue *msq) | |
2042 | { | |
2043 | return (char *)msq->q_perm.security; | |
2044 | } | |
2045 | ||
ecfcc53f EB |
2046 | /** |
2047 | * smk_curacc_msq : helper to check if current has access on msq | |
2048 | * @msq : the msq | |
2049 | * @access : access requested | |
2050 | * | |
2051 | * return 0 if current has access, error otherwise | |
2052 | */ | |
2053 | static int smk_curacc_msq(struct msg_queue *msq, int access) | |
2054 | { | |
2055 | char *msp = smack_of_msq(msq); | |
2056 | struct smk_audit_info ad; | |
2057 | ||
2058 | #ifdef CONFIG_AUDIT | |
2059 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2060 | ad.a.u.ipc_id = msq->q_perm.id; | |
2061 | #endif | |
2062 | return smk_curacc(msp, access, &ad); | |
2063 | } | |
2064 | ||
e114e473 CS |
2065 | /** |
2066 | * smack_msg_queue_associate - Smack access check for msg_queue | |
2067 | * @msq: the object | |
2068 | * @msqflg: access requested | |
2069 | * | |
2070 | * Returns 0 if current has the requested access, error code otherwise | |
2071 | */ | |
2072 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
2073 | { | |
e114e473 CS |
2074 | int may; |
2075 | ||
2076 | may = smack_flags_to_may(msqflg); | |
ecfcc53f | 2077 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2078 | } |
2079 | ||
2080 | /** | |
2081 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
2082 | * @msq: the object | |
2083 | * @cmd: what it wants to do | |
2084 | * | |
2085 | * Returns 0 if current has the requested access, error code otherwise | |
2086 | */ | |
2087 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
2088 | { | |
e114e473 CS |
2089 | int may; |
2090 | ||
2091 | switch (cmd) { | |
2092 | case IPC_STAT: | |
2093 | case MSG_STAT: | |
2094 | may = MAY_READ; | |
2095 | break; | |
2096 | case IPC_SET: | |
2097 | case IPC_RMID: | |
2098 | may = MAY_READWRITE; | |
2099 | break; | |
2100 | case IPC_INFO: | |
2101 | case MSG_INFO: | |
2102 | /* | |
2103 | * System level information | |
2104 | */ | |
2105 | return 0; | |
2106 | default: | |
2107 | return -EINVAL; | |
2108 | } | |
2109 | ||
ecfcc53f | 2110 | return smk_curacc_msq(msq, may); |
e114e473 CS |
2111 | } |
2112 | ||
2113 | /** | |
2114 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2115 | * @msq: the object | |
2116 | * @msg: unused | |
2117 | * @msqflg: access requested | |
2118 | * | |
2119 | * Returns 0 if current has the requested access, error code otherwise | |
2120 | */ | |
2121 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
2122 | int msqflg) | |
2123 | { | |
ecfcc53f | 2124 | int may; |
e114e473 | 2125 | |
ecfcc53f EB |
2126 | may = smack_flags_to_may(msqflg); |
2127 | return smk_curacc_msq(msq, may); | |
e114e473 CS |
2128 | } |
2129 | ||
2130 | /** | |
2131 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
2132 | * @msq: the object | |
2133 | * @msg: unused | |
2134 | * @target: unused | |
2135 | * @type: unused | |
2136 | * @mode: unused | |
2137 | * | |
2138 | * Returns 0 if current has read and write access, error code otherwise | |
2139 | */ | |
2140 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
2141 | struct task_struct *target, long type, int mode) | |
2142 | { | |
ecfcc53f | 2143 | return smk_curacc_msq(msq, MAY_READWRITE); |
e114e473 CS |
2144 | } |
2145 | ||
2146 | /** | |
2147 | * smack_ipc_permission - Smack access for ipc_permission() | |
2148 | * @ipp: the object permissions | |
2149 | * @flag: access requested | |
2150 | * | |
2151 | * Returns 0 if current has read and write access, error code otherwise | |
2152 | */ | |
2153 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
2154 | { | |
2155 | char *isp = ipp->security; | |
ecfcc53f EB |
2156 | int may = smack_flags_to_may(flag); |
2157 | struct smk_audit_info ad; | |
e114e473 | 2158 | |
ecfcc53f EB |
2159 | #ifdef CONFIG_AUDIT |
2160 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
2161 | ad.a.u.ipc_id = ipp->id; | |
2162 | #endif | |
2163 | return smk_curacc(isp, may, &ad); | |
e114e473 CS |
2164 | } |
2165 | ||
d20bdda6 AD |
2166 | /** |
2167 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 2168 | * @ipp: the object permissions |
d20bdda6 AD |
2169 | * @secid: where result will be saved |
2170 | */ | |
2171 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
2172 | { | |
2173 | char *smack = ipp->security; | |
2174 | ||
2175 | *secid = smack_to_secid(smack); | |
2176 | } | |
2177 | ||
e114e473 CS |
2178 | /** |
2179 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
2180 | * @opt_dentry: unused | |
2181 | * @inode: the object | |
2182 | * | |
2183 | * Set the inode's security blob if it hasn't been done already. | |
2184 | */ | |
2185 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
2186 | { | |
2187 | struct super_block *sbp; | |
2188 | struct superblock_smack *sbsp; | |
2189 | struct inode_smack *isp; | |
86a264ab | 2190 | char *csp = current_security(); |
e114e473 CS |
2191 | char *fetched; |
2192 | char *final; | |
2193 | struct dentry *dp; | |
2194 | ||
2195 | if (inode == NULL) | |
2196 | return; | |
2197 | ||
2198 | isp = inode->i_security; | |
2199 | ||
2200 | mutex_lock(&isp->smk_lock); | |
2201 | /* | |
2202 | * If the inode is already instantiated | |
2203 | * take the quick way out | |
2204 | */ | |
2205 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
2206 | goto unlockandout; | |
2207 | ||
2208 | sbp = inode->i_sb; | |
2209 | sbsp = sbp->s_security; | |
2210 | /* | |
2211 | * We're going to use the superblock default label | |
2212 | * if there's no label on the file. | |
2213 | */ | |
2214 | final = sbsp->smk_default; | |
2215 | ||
e97dcb0e CS |
2216 | /* |
2217 | * If this is the root inode the superblock | |
2218 | * may be in the process of initialization. | |
2219 | * If that is the case use the root value out | |
2220 | * of the superblock. | |
2221 | */ | |
2222 | if (opt_dentry->d_parent == opt_dentry) { | |
2223 | isp->smk_inode = sbsp->smk_root; | |
2224 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2225 | goto unlockandout; | |
2226 | } | |
2227 | ||
e114e473 CS |
2228 | /* |
2229 | * This is pretty hackish. | |
2230 | * Casey says that we shouldn't have to do | |
2231 | * file system specific code, but it does help | |
2232 | * with keeping it simple. | |
2233 | */ | |
2234 | switch (sbp->s_magic) { | |
2235 | case SMACK_MAGIC: | |
2236 | /* | |
2237 | * Casey says that it's a little embarassing | |
2238 | * that the smack file system doesn't do | |
2239 | * extended attributes. | |
2240 | */ | |
2241 | final = smack_known_star.smk_known; | |
2242 | break; | |
2243 | case PIPEFS_MAGIC: | |
2244 | /* | |
2245 | * Casey says pipes are easy (?) | |
2246 | */ | |
2247 | final = smack_known_star.smk_known; | |
2248 | break; | |
2249 | case DEVPTS_SUPER_MAGIC: | |
2250 | /* | |
2251 | * devpts seems content with the label of the task. | |
2252 | * Programs that change smack have to treat the | |
2253 | * pty with respect. | |
2254 | */ | |
2255 | final = csp; | |
2256 | break; | |
2257 | case SOCKFS_MAGIC: | |
2258 | /* | |
2259 | * Casey says sockets get the smack of the task. | |
2260 | */ | |
2261 | final = csp; | |
2262 | break; | |
2263 | case PROC_SUPER_MAGIC: | |
2264 | /* | |
2265 | * Casey says procfs appears not to care. | |
2266 | * The superblock default suffices. | |
2267 | */ | |
2268 | break; | |
2269 | case TMPFS_MAGIC: | |
2270 | /* | |
2271 | * Device labels should come from the filesystem, | |
2272 | * but watch out, because they're volitile, | |
2273 | * getting recreated on every reboot. | |
2274 | */ | |
2275 | final = smack_known_star.smk_known; | |
2276 | /* | |
2277 | * No break. | |
2278 | * | |
2279 | * If a smack value has been set we want to use it, | |
2280 | * but since tmpfs isn't giving us the opportunity | |
2281 | * to set mount options simulate setting the | |
2282 | * superblock default. | |
2283 | */ | |
2284 | default: | |
2285 | /* | |
2286 | * This isn't an understood special case. | |
2287 | * Get the value from the xattr. | |
2288 | * | |
2289 | * No xattr support means, alas, no SMACK label. | |
2290 | * Use the aforeapplied default. | |
2291 | * It would be curious if the label of the task | |
2292 | * does not match that assigned. | |
2293 | */ | |
2294 | if (inode->i_op->getxattr == NULL) | |
2295 | break; | |
2296 | /* | |
2297 | * Get the dentry for xattr. | |
2298 | */ | |
2299 | if (opt_dentry == NULL) { | |
2300 | dp = d_find_alias(inode); | |
2301 | if (dp == NULL) | |
2302 | break; | |
2303 | } else { | |
2304 | dp = dget(opt_dentry); | |
2305 | if (dp == NULL) | |
2306 | break; | |
2307 | } | |
2308 | ||
2309 | fetched = smk_fetch(inode, dp); | |
2310 | if (fetched != NULL) | |
2311 | final = fetched; | |
2312 | ||
2313 | dput(dp); | |
2314 | break; | |
2315 | } | |
2316 | ||
2317 | if (final == NULL) | |
2318 | isp->smk_inode = csp; | |
2319 | else | |
2320 | isp->smk_inode = final; | |
2321 | ||
2322 | isp->smk_flags |= SMK_INODE_INSTANT; | |
2323 | ||
2324 | unlockandout: | |
2325 | mutex_unlock(&isp->smk_lock); | |
2326 | return; | |
2327 | } | |
2328 | ||
2329 | /** | |
2330 | * smack_getprocattr - Smack process attribute access | |
2331 | * @p: the object task | |
2332 | * @name: the name of the attribute in /proc/.../attr | |
2333 | * @value: where to put the result | |
2334 | * | |
2335 | * Places a copy of the task Smack into value | |
2336 | * | |
2337 | * Returns the length of the smack label or an error code | |
2338 | */ | |
2339 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
2340 | { | |
2341 | char *cp; | |
2342 | int slen; | |
2343 | ||
2344 | if (strcmp(name, "current") != 0) | |
2345 | return -EINVAL; | |
2346 | ||
c69e8d9c | 2347 | cp = kstrdup(task_security(p), GFP_KERNEL); |
e114e473 CS |
2348 | if (cp == NULL) |
2349 | return -ENOMEM; | |
2350 | ||
2351 | slen = strlen(cp); | |
2352 | *value = cp; | |
2353 | return slen; | |
2354 | } | |
2355 | ||
2356 | /** | |
2357 | * smack_setprocattr - Smack process attribute setting | |
2358 | * @p: the object task | |
2359 | * @name: the name of the attribute in /proc/.../attr | |
2360 | * @value: the value to set | |
2361 | * @size: the size of the value | |
2362 | * | |
2363 | * Sets the Smack value of the task. Only setting self | |
2364 | * is permitted and only with privilege | |
2365 | * | |
2366 | * Returns the length of the smack label or an error code | |
2367 | */ | |
2368 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2369 | void *value, size_t size) | |
2370 | { | |
d84f4f99 | 2371 | struct cred *new; |
e114e473 CS |
2372 | char *newsmack; |
2373 | ||
e114e473 CS |
2374 | /* |
2375 | * Changing another process' Smack value is too dangerous | |
2376 | * and supports no sane use case. | |
2377 | */ | |
2378 | if (p != current) | |
2379 | return -EPERM; | |
2380 | ||
5cd9c58f DH |
2381 | if (!capable(CAP_MAC_ADMIN)) |
2382 | return -EPERM; | |
2383 | ||
e114e473 CS |
2384 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) |
2385 | return -EINVAL; | |
2386 | ||
2387 | if (strcmp(name, "current") != 0) | |
2388 | return -EINVAL; | |
2389 | ||
2390 | newsmack = smk_import(value, size); | |
2391 | if (newsmack == NULL) | |
2392 | return -EINVAL; | |
2393 | ||
6d3dc07c CS |
2394 | /* |
2395 | * No process is ever allowed the web ("@") label. | |
2396 | */ | |
2397 | if (newsmack == smack_known_web.smk_known) | |
2398 | return -EPERM; | |
2399 | ||
d84f4f99 | 2400 | new = prepare_creds(); |
6d3dc07c | 2401 | if (new == NULL) |
d84f4f99 DH |
2402 | return -ENOMEM; |
2403 | new->security = newsmack; | |
2404 | commit_creds(new); | |
e114e473 CS |
2405 | return size; |
2406 | } | |
2407 | ||
2408 | /** | |
2409 | * smack_unix_stream_connect - Smack access on UDS | |
2410 | * @sock: one socket | |
2411 | * @other: the other socket | |
2412 | * @newsk: unused | |
2413 | * | |
2414 | * Return 0 if a subject with the smack of sock could access | |
2415 | * an object with the smack of other, otherwise an error code | |
2416 | */ | |
2417 | static int smack_unix_stream_connect(struct socket *sock, | |
2418 | struct socket *other, struct sock *newsk) | |
2419 | { | |
2420 | struct inode *sp = SOCK_INODE(sock); | |
2421 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2422 | struct smk_audit_info ad; |
e114e473 | 2423 | |
ecfcc53f EB |
2424 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2425 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2426 | return smk_access(smk_of_inode(sp), smk_of_inode(op), | |
2427 | MAY_READWRITE, &ad); | |
e114e473 CS |
2428 | } |
2429 | ||
2430 | /** | |
2431 | * smack_unix_may_send - Smack access on UDS | |
2432 | * @sock: one socket | |
2433 | * @other: the other socket | |
2434 | * | |
2435 | * Return 0 if a subject with the smack of sock could access | |
2436 | * an object with the smack of other, otherwise an error code | |
2437 | */ | |
2438 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2439 | { | |
2440 | struct inode *sp = SOCK_INODE(sock); | |
2441 | struct inode *op = SOCK_INODE(other); | |
ecfcc53f | 2442 | struct smk_audit_info ad; |
e114e473 | 2443 | |
ecfcc53f EB |
2444 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); |
2445 | smk_ad_setfield_u_net_sk(&ad, other->sk); | |
2446 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); | |
e114e473 CS |
2447 | } |
2448 | ||
6d3dc07c CS |
2449 | /** |
2450 | * smack_socket_sendmsg - Smack check based on destination host | |
2451 | * @sock: the socket | |
251a2a95 | 2452 | * @msg: the message |
6d3dc07c CS |
2453 | * @size: the size of the message |
2454 | * | |
2455 | * Return 0 if the current subject can write to the destination | |
2456 | * host. This is only a question if the destination is a single | |
2457 | * label host. | |
2458 | */ | |
2459 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
2460 | int size) | |
2461 | { | |
2462 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
6d3dc07c CS |
2463 | |
2464 | /* | |
2465 | * Perfectly reasonable for this to be NULL | |
2466 | */ | |
da34d424 | 2467 | if (sip == NULL || sip->sin_family != AF_INET) |
6d3dc07c CS |
2468 | return 0; |
2469 | ||
07feee8f | 2470 | return smack_netlabel_send(sock->sk, sip); |
6d3dc07c CS |
2471 | } |
2472 | ||
2473 | ||
e114e473 | 2474 | /** |
251a2a95 | 2475 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 CS |
2476 | * @sap: netlabel secattr |
2477 | * @sip: where to put the result | |
2478 | * | |
2479 | * Copies a smack label into sip | |
2480 | */ | |
2481 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2482 | { | |
2483 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2484 | char *sp; |
e114e473 CS |
2485 | int pcat; |
2486 | ||
6d3dc07c | 2487 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 2488 | /* |
6d3dc07c | 2489 | * Looks like a CIPSO packet. |
e114e473 CS |
2490 | * If there are flags but no level netlabel isn't |
2491 | * behaving the way we expect it to. | |
2492 | * | |
6d3dc07c | 2493 | * Get the categories, if any |
e114e473 CS |
2494 | * Without guidance regarding the smack value |
2495 | * for the packet fall back on the network | |
2496 | * ambient value. | |
2497 | */ | |
6d3dc07c CS |
2498 | memset(smack, '\0', SMK_LABELLEN); |
2499 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2500 | for (pcat = -1;;) { | |
2501 | pcat = netlbl_secattr_catmap_walk( | |
2502 | sap->attr.mls.cat, pcat + 1); | |
2503 | if (pcat < 0) | |
2504 | break; | |
2505 | smack_catset_bit(pcat, smack); | |
2506 | } | |
2507 | /* | |
2508 | * If it is CIPSO using smack direct mapping | |
2509 | * we are already done. WeeHee. | |
2510 | */ | |
2511 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2512 | memcpy(sip, smack, SMK_MAXLEN); | |
2513 | return; | |
2514 | } | |
2515 | /* | |
2516 | * Look it up in the supplied table if it is not | |
2517 | * a direct mapping. | |
2518 | */ | |
2519 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
e114e473 CS |
2520 | return; |
2521 | } | |
6d3dc07c CS |
2522 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { |
2523 | /* | |
2524 | * Looks like a fallback, which gives us a secid. | |
2525 | */ | |
2526 | sp = smack_from_secid(sap->attr.secid); | |
2527 | /* | |
2528 | * This has got to be a bug because it is | |
2529 | * impossible to specify a fallback without | |
2530 | * specifying the label, which will ensure | |
2531 | * it has a secid, and the only way to get a | |
2532 | * secid is from a fallback. | |
2533 | */ | |
2534 | BUG_ON(sp == NULL); | |
2535 | strncpy(sip, sp, SMK_MAXLEN); | |
e114e473 CS |
2536 | return; |
2537 | } | |
2538 | /* | |
6d3dc07c CS |
2539 | * Without guidance regarding the smack value |
2540 | * for the packet fall back on the network | |
2541 | * ambient value. | |
e114e473 | 2542 | */ |
6d3dc07c | 2543 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); |
e114e473 CS |
2544 | return; |
2545 | } | |
2546 | ||
2547 | /** | |
2548 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2549 | * @sk: socket | |
2550 | * @skb: packet | |
2551 | * | |
2552 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2553 | */ | |
2554 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2555 | { | |
2556 | struct netlbl_lsm_secattr secattr; | |
2557 | struct socket_smack *ssp = sk->sk_security; | |
2558 | char smack[SMK_LABELLEN]; | |
6d3dc07c | 2559 | char *csp; |
e114e473 | 2560 | int rc; |
ecfcc53f | 2561 | struct smk_audit_info ad; |
e114e473 CS |
2562 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) |
2563 | return 0; | |
2564 | ||
2565 | /* | |
2566 | * Translate what netlabel gave us. | |
2567 | */ | |
e114e473 | 2568 | netlbl_secattr_init(&secattr); |
6d3dc07c | 2569 | |
e114e473 | 2570 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); |
6d3dc07c | 2571 | if (rc == 0) { |
e114e473 | 2572 | smack_from_secattr(&secattr, smack); |
6d3dc07c CS |
2573 | csp = smack; |
2574 | } else | |
2575 | csp = smack_net_ambient; | |
2576 | ||
e114e473 | 2577 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 2578 | |
ecfcc53f EB |
2579 | #ifdef CONFIG_AUDIT |
2580 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2581 | ad.a.u.net.family = sk->sk_family; | |
2582 | ad.a.u.net.netif = skb->iif; | |
2583 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
2584 | #endif | |
e114e473 CS |
2585 | /* |
2586 | * Receiving a packet requires that the other end | |
2587 | * be able to write here. Read access is not required. | |
2588 | * This is the simplist possible security model | |
2589 | * for networking. | |
2590 | */ | |
ecfcc53f | 2591 | rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); |
a8134296 PM |
2592 | if (rc != 0) |
2593 | netlbl_skbuff_err(skb, rc, 0); | |
2594 | return rc; | |
e114e473 CS |
2595 | } |
2596 | ||
2597 | /** | |
2598 | * smack_socket_getpeersec_stream - pull in packet label | |
2599 | * @sock: the socket | |
2600 | * @optval: user's destination | |
2601 | * @optlen: size thereof | |
251a2a95 | 2602 | * @len: max thereof |
e114e473 CS |
2603 | * |
2604 | * returns zero on success, an error code otherwise | |
2605 | */ | |
2606 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2607 | char __user *optval, | |
2608 | int __user *optlen, unsigned len) | |
2609 | { | |
2610 | struct socket_smack *ssp; | |
2611 | int slen; | |
2612 | int rc = 0; | |
2613 | ||
2614 | ssp = sock->sk->sk_security; | |
2615 | slen = strlen(ssp->smk_packet) + 1; | |
2616 | ||
2617 | if (slen > len) | |
2618 | rc = -ERANGE; | |
2619 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2620 | rc = -EFAULT; | |
2621 | ||
2622 | if (put_user(slen, optlen) != 0) | |
2623 | rc = -EFAULT; | |
2624 | ||
2625 | return rc; | |
2626 | } | |
2627 | ||
2628 | ||
2629 | /** | |
2630 | * smack_socket_getpeersec_dgram - pull in packet label | |
2631 | * @sock: the socket | |
2632 | * @skb: packet data | |
2633 | * @secid: pointer to where to put the secid of the packet | |
2634 | * | |
2635 | * Sets the netlabel socket state on sk from parent | |
2636 | */ | |
2637 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2638 | struct sk_buff *skb, u32 *secid) | |
2639 | ||
2640 | { | |
2641 | struct netlbl_lsm_secattr secattr; | |
2642 | struct sock *sk; | |
2643 | char smack[SMK_LABELLEN]; | |
2644 | int family = PF_INET; | |
2645 | u32 s; | |
2646 | int rc; | |
2647 | ||
2648 | /* | |
2649 | * Only works for families with packets. | |
2650 | */ | |
2651 | if (sock != NULL) { | |
2652 | sk = sock->sk; | |
2653 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2654 | return 0; | |
2655 | family = sk->sk_family; | |
2656 | } | |
2657 | /* | |
2658 | * Translate what netlabel gave us. | |
2659 | */ | |
e114e473 CS |
2660 | netlbl_secattr_init(&secattr); |
2661 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2662 | if (rc == 0) | |
2663 | smack_from_secattr(&secattr, smack); | |
2664 | netlbl_secattr_destroy(&secattr); | |
2665 | ||
2666 | /* | |
2667 | * Give up if we couldn't get anything | |
2668 | */ | |
2669 | if (rc != 0) | |
2670 | return rc; | |
2671 | ||
2672 | s = smack_to_secid(smack); | |
2673 | if (s == 0) | |
2674 | return -EINVAL; | |
2675 | ||
2676 | *secid = s; | |
2677 | return 0; | |
2678 | } | |
2679 | ||
2680 | /** | |
07feee8f PM |
2681 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
2682 | * @sk: child sock | |
2683 | * @parent: parent socket | |
e114e473 | 2684 | * |
07feee8f PM |
2685 | * Set the smk_{in,out} state of an existing sock based on the process that |
2686 | * is creating the new socket. | |
e114e473 CS |
2687 | */ |
2688 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2689 | { | |
2690 | struct socket_smack *ssp; | |
e114e473 | 2691 | |
07feee8f PM |
2692 | if (sk == NULL || |
2693 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
2694 | return; |
2695 | ||
2696 | ssp = sk->sk_security; | |
86a264ab | 2697 | ssp->smk_in = ssp->smk_out = current_security(); |
07feee8f | 2698 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
2699 | } |
2700 | ||
2701 | /** | |
2702 | * smack_inet_conn_request - Smack access check on connect | |
2703 | * @sk: socket involved | |
2704 | * @skb: packet | |
2705 | * @req: unused | |
2706 | * | |
2707 | * Returns 0 if a task with the packet label could write to | |
2708 | * the socket, otherwise an error code | |
2709 | */ | |
2710 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2711 | struct request_sock *req) | |
2712 | { | |
07feee8f | 2713 | u16 family = sk->sk_family; |
e114e473 | 2714 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
2715 | struct netlbl_lsm_secattr secattr; |
2716 | struct sockaddr_in addr; | |
2717 | struct iphdr *hdr; | |
e114e473 CS |
2718 | char smack[SMK_LABELLEN]; |
2719 | int rc; | |
ecfcc53f | 2720 | struct smk_audit_info ad; |
e114e473 | 2721 | |
07feee8f PM |
2722 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
2723 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
2724 | family = PF_INET; | |
e114e473 | 2725 | |
07feee8f PM |
2726 | netlbl_secattr_init(&secattr); |
2727 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 2728 | if (rc == 0) |
07feee8f | 2729 | smack_from_secattr(&secattr, smack); |
e114e473 CS |
2730 | else |
2731 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
07feee8f PM |
2732 | netlbl_secattr_destroy(&secattr); |
2733 | ||
ecfcc53f EB |
2734 | #ifdef CONFIG_AUDIT |
2735 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); | |
2736 | ad.a.u.net.family = family; | |
2737 | ad.a.u.net.netif = skb->iif; | |
2738 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
2739 | #endif | |
e114e473 | 2740 | /* |
07feee8f PM |
2741 | * Receiving a packet requires that the other end be able to write |
2742 | * here. Read access is not required. | |
e114e473 | 2743 | */ |
ecfcc53f | 2744 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); |
07feee8f PM |
2745 | if (rc != 0) |
2746 | return rc; | |
2747 | ||
2748 | /* | |
2749 | * Save the peer's label in the request_sock so we can later setup | |
2750 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
2751 | */ | |
2752 | req->peer_secid = smack_to_secid(smack); | |
2753 | ||
2754 | /* | |
2755 | * We need to decide if we want to label the incoming connection here | |
2756 | * if we do we only need to label the request_sock and the stack will | |
2757 | * propogate the wire-label to the sock when it is created. | |
2758 | */ | |
2759 | hdr = ip_hdr(skb); | |
2760 | addr.sin_addr.s_addr = hdr->saddr; | |
2761 | rcu_read_lock(); | |
2762 | if (smack_host_label(&addr) == NULL) { | |
2763 | rcu_read_unlock(); | |
2764 | netlbl_secattr_init(&secattr); | |
2765 | smack_to_secattr(smack, &secattr); | |
2766 | rc = netlbl_req_setattr(req, &secattr); | |
2767 | netlbl_secattr_destroy(&secattr); | |
2768 | } else { | |
2769 | rcu_read_unlock(); | |
2770 | netlbl_req_delattr(req); | |
2771 | } | |
e114e473 CS |
2772 | |
2773 | return rc; | |
2774 | } | |
2775 | ||
07feee8f PM |
2776 | /** |
2777 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
2778 | * @sk: the new socket | |
2779 | * @req: the connection's request_sock | |
2780 | * | |
2781 | * Transfer the connection's peer label to the newly created socket. | |
2782 | */ | |
2783 | static void smack_inet_csk_clone(struct sock *sk, | |
2784 | const struct request_sock *req) | |
2785 | { | |
2786 | struct socket_smack *ssp = sk->sk_security; | |
2787 | char *smack; | |
2788 | ||
2789 | if (req->peer_secid != 0) { | |
2790 | smack = smack_from_secid(req->peer_secid); | |
2791 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2792 | } else | |
2793 | ssp->smk_packet[0] = '\0'; | |
2794 | } | |
2795 | ||
e114e473 CS |
2796 | /* |
2797 | * Key management security hooks | |
2798 | * | |
2799 | * Casey has not tested key support very heavily. | |
2800 | * The permission check is most likely too restrictive. | |
2801 | * If you care about keys please have a look. | |
2802 | */ | |
2803 | #ifdef CONFIG_KEYS | |
2804 | ||
2805 | /** | |
2806 | * smack_key_alloc - Set the key security blob | |
2807 | * @key: object | |
d84f4f99 | 2808 | * @cred: the credentials to use |
e114e473 CS |
2809 | * @flags: unused |
2810 | * | |
2811 | * No allocation required | |
2812 | * | |
2813 | * Returns 0 | |
2814 | */ | |
d84f4f99 | 2815 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
2816 | unsigned long flags) |
2817 | { | |
d84f4f99 | 2818 | key->security = cred->security; |
e114e473 CS |
2819 | return 0; |
2820 | } | |
2821 | ||
2822 | /** | |
2823 | * smack_key_free - Clear the key security blob | |
2824 | * @key: the object | |
2825 | * | |
2826 | * Clear the blob pointer | |
2827 | */ | |
2828 | static void smack_key_free(struct key *key) | |
2829 | { | |
2830 | key->security = NULL; | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * smack_key_permission - Smack access on a key | |
2835 | * @key_ref: gets to the object | |
d84f4f99 | 2836 | * @cred: the credentials to use |
e114e473 CS |
2837 | * @perm: unused |
2838 | * | |
2839 | * Return 0 if the task has read and write to the object, | |
2840 | * an error code otherwise | |
2841 | */ | |
2842 | static int smack_key_permission(key_ref_t key_ref, | |
d84f4f99 | 2843 | const struct cred *cred, key_perm_t perm) |
e114e473 CS |
2844 | { |
2845 | struct key *keyp; | |
ecfcc53f | 2846 | struct smk_audit_info ad; |
e114e473 CS |
2847 | |
2848 | keyp = key_ref_to_ptr(key_ref); | |
2849 | if (keyp == NULL) | |
2850 | return -EINVAL; | |
2851 | /* | |
2852 | * If the key hasn't been initialized give it access so that | |
2853 | * it may do so. | |
2854 | */ | |
2855 | if (keyp->security == NULL) | |
2856 | return 0; | |
2857 | /* | |
2858 | * This should not occur | |
2859 | */ | |
d84f4f99 | 2860 | if (cred->security == NULL) |
e114e473 | 2861 | return -EACCES; |
ecfcc53f EB |
2862 | #ifdef CONFIG_AUDIT |
2863 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
2864 | ad.a.u.key_struct.key = keyp->serial; | |
2865 | ad.a.u.key_struct.key_desc = keyp->description; | |
2866 | #endif | |
2867 | return smk_access(cred->security, keyp->security, | |
2868 | MAY_READWRITE, &ad); | |
e114e473 CS |
2869 | } |
2870 | #endif /* CONFIG_KEYS */ | |
2871 | ||
d20bdda6 AD |
2872 | /* |
2873 | * Smack Audit hooks | |
2874 | * | |
2875 | * Audit requires a unique representation of each Smack specific | |
2876 | * rule. This unique representation is used to distinguish the | |
2877 | * object to be audited from remaining kernel objects and also | |
2878 | * works as a glue between the audit hooks. | |
2879 | * | |
2880 | * Since repository entries are added but never deleted, we'll use | |
2881 | * the smack_known label address related to the given audit rule as | |
2882 | * the needed unique representation. This also better fits the smack | |
2883 | * model where nearly everything is a label. | |
2884 | */ | |
2885 | #ifdef CONFIG_AUDIT | |
2886 | ||
2887 | /** | |
2888 | * smack_audit_rule_init - Initialize a smack audit rule | |
2889 | * @field: audit rule fields given from user-space (audit.h) | |
2890 | * @op: required testing operator (=, !=, >, <, ...) | |
2891 | * @rulestr: smack label to be audited | |
2892 | * @vrule: pointer to save our own audit rule representation | |
2893 | * | |
2894 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
2895 | * The label to be audited is created if necessay. | |
2896 | */ | |
2897 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
2898 | { | |
2899 | char **rule = (char **)vrule; | |
2900 | *rule = NULL; | |
2901 | ||
2902 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2903 | return -EINVAL; | |
2904 | ||
5af75d8d | 2905 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
2906 | return -EINVAL; |
2907 | ||
2908 | *rule = smk_import(rulestr, 0); | |
2909 | ||
2910 | return 0; | |
2911 | } | |
2912 | ||
2913 | /** | |
2914 | * smack_audit_rule_known - Distinguish Smack audit rules | |
2915 | * @krule: rule of interest, in Audit kernel representation format | |
2916 | * | |
2917 | * This is used to filter Smack rules from remaining Audit ones. | |
2918 | * If it's proved that this rule belongs to us, the | |
2919 | * audit_rule_match hook will be called to do the final judgement. | |
2920 | */ | |
2921 | static int smack_audit_rule_known(struct audit_krule *krule) | |
2922 | { | |
2923 | struct audit_field *f; | |
2924 | int i; | |
2925 | ||
2926 | for (i = 0; i < krule->field_count; i++) { | |
2927 | f = &krule->fields[i]; | |
2928 | ||
2929 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
2930 | return 1; | |
2931 | } | |
2932 | ||
2933 | return 0; | |
2934 | } | |
2935 | ||
2936 | /** | |
2937 | * smack_audit_rule_match - Audit given object ? | |
2938 | * @secid: security id for identifying the object to test | |
2939 | * @field: audit rule flags given from user-space | |
2940 | * @op: required testing operator | |
2941 | * @vrule: smack internal rule presentation | |
2942 | * @actx: audit context associated with the check | |
2943 | * | |
2944 | * The core Audit hook. It's used to take the decision of | |
2945 | * whether to audit or not to audit a given object. | |
2946 | */ | |
2947 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
2948 | struct audit_context *actx) | |
2949 | { | |
2950 | char *smack; | |
2951 | char *rule = vrule; | |
2952 | ||
2953 | if (!rule) { | |
2954 | audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
2955 | "Smack: missing rule\n"); | |
2956 | return -ENOENT; | |
2957 | } | |
2958 | ||
2959 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
2960 | return 0; | |
2961 | ||
2962 | smack = smack_from_secid(secid); | |
2963 | ||
2964 | /* | |
2965 | * No need to do string comparisons. If a match occurs, | |
2966 | * both pointers will point to the same smack_known | |
2967 | * label. | |
2968 | */ | |
5af75d8d | 2969 | if (op == Audit_equal) |
d20bdda6 | 2970 | return (rule == smack); |
5af75d8d | 2971 | if (op == Audit_not_equal) |
d20bdda6 AD |
2972 | return (rule != smack); |
2973 | ||
2974 | return 0; | |
2975 | } | |
2976 | ||
2977 | /** | |
2978 | * smack_audit_rule_free - free smack rule representation | |
2979 | * @vrule: rule to be freed. | |
2980 | * | |
2981 | * No memory was allocated. | |
2982 | */ | |
2983 | static void smack_audit_rule_free(void *vrule) | |
2984 | { | |
2985 | /* No-op */ | |
2986 | } | |
2987 | ||
2988 | #endif /* CONFIG_AUDIT */ | |
2989 | ||
251a2a95 | 2990 | /** |
e114e473 CS |
2991 | * smack_secid_to_secctx - return the smack label for a secid |
2992 | * @secid: incoming integer | |
2993 | * @secdata: destination | |
2994 | * @seclen: how long it is | |
2995 | * | |
2996 | * Exists for networking code. | |
2997 | */ | |
2998 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
2999 | { | |
3000 | char *sp = smack_from_secid(secid); | |
3001 | ||
3002 | *secdata = sp; | |
3003 | *seclen = strlen(sp); | |
3004 | return 0; | |
3005 | } | |
3006 | ||
251a2a95 | 3007 | /** |
4bc87e62 CS |
3008 | * smack_secctx_to_secid - return the secid for a smack label |
3009 | * @secdata: smack label | |
3010 | * @seclen: how long result is | |
3011 | * @secid: outgoing integer | |
3012 | * | |
3013 | * Exists for audit and networking code. | |
3014 | */ | |
e52c1764 | 3015 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 CS |
3016 | { |
3017 | *secid = smack_to_secid(secdata); | |
3018 | return 0; | |
3019 | } | |
3020 | ||
251a2a95 | 3021 | /** |
e114e473 | 3022 | * smack_release_secctx - don't do anything. |
251a2a95 RD |
3023 | * @secdata: unused |
3024 | * @seclen: unused | |
e114e473 CS |
3025 | * |
3026 | * Exists to make sure nothing gets done, and properly | |
3027 | */ | |
3028 | static void smack_release_secctx(char *secdata, u32 seclen) | |
3029 | { | |
3030 | } | |
3031 | ||
076c54c5 AD |
3032 | struct security_operations smack_ops = { |
3033 | .name = "smack", | |
3034 | ||
9e48858f | 3035 | .ptrace_access_check = smack_ptrace_access_check, |
5cd9c58f | 3036 | .ptrace_traceme = smack_ptrace_traceme, |
e114e473 | 3037 | .syslog = smack_syslog, |
e114e473 CS |
3038 | |
3039 | .sb_alloc_security = smack_sb_alloc_security, | |
3040 | .sb_free_security = smack_sb_free_security, | |
3041 | .sb_copy_data = smack_sb_copy_data, | |
3042 | .sb_kern_mount = smack_sb_kern_mount, | |
3043 | .sb_statfs = smack_sb_statfs, | |
3044 | .sb_mount = smack_sb_mount, | |
3045 | .sb_umount = smack_sb_umount, | |
3046 | ||
3047 | .inode_alloc_security = smack_inode_alloc_security, | |
3048 | .inode_free_security = smack_inode_free_security, | |
3049 | .inode_init_security = smack_inode_init_security, | |
3050 | .inode_link = smack_inode_link, | |
3051 | .inode_unlink = smack_inode_unlink, | |
3052 | .inode_rmdir = smack_inode_rmdir, | |
3053 | .inode_rename = smack_inode_rename, | |
3054 | .inode_permission = smack_inode_permission, | |
3055 | .inode_setattr = smack_inode_setattr, | |
3056 | .inode_getattr = smack_inode_getattr, | |
3057 | .inode_setxattr = smack_inode_setxattr, | |
3058 | .inode_post_setxattr = smack_inode_post_setxattr, | |
3059 | .inode_getxattr = smack_inode_getxattr, | |
3060 | .inode_removexattr = smack_inode_removexattr, | |
3061 | .inode_getsecurity = smack_inode_getsecurity, | |
3062 | .inode_setsecurity = smack_inode_setsecurity, | |
3063 | .inode_listsecurity = smack_inode_listsecurity, | |
d20bdda6 | 3064 | .inode_getsecid = smack_inode_getsecid, |
e114e473 CS |
3065 | |
3066 | .file_permission = smack_file_permission, | |
3067 | .file_alloc_security = smack_file_alloc_security, | |
3068 | .file_free_security = smack_file_free_security, | |
3069 | .file_ioctl = smack_file_ioctl, | |
3070 | .file_lock = smack_file_lock, | |
3071 | .file_fcntl = smack_file_fcntl, | |
3072 | .file_set_fowner = smack_file_set_fowner, | |
3073 | .file_send_sigiotask = smack_file_send_sigiotask, | |
3074 | .file_receive = smack_file_receive, | |
3075 | ||
f1752eec | 3076 | .cred_free = smack_cred_free, |
d84f4f99 DH |
3077 | .cred_prepare = smack_cred_prepare, |
3078 | .cred_commit = smack_cred_commit, | |
3a3b7ce9 DH |
3079 | .kernel_act_as = smack_kernel_act_as, |
3080 | .kernel_create_files_as = smack_kernel_create_files_as, | |
e114e473 CS |
3081 | .task_setpgid = smack_task_setpgid, |
3082 | .task_getpgid = smack_task_getpgid, | |
3083 | .task_getsid = smack_task_getsid, | |
3084 | .task_getsecid = smack_task_getsecid, | |
3085 | .task_setnice = smack_task_setnice, | |
3086 | .task_setioprio = smack_task_setioprio, | |
3087 | .task_getioprio = smack_task_getioprio, | |
3088 | .task_setscheduler = smack_task_setscheduler, | |
3089 | .task_getscheduler = smack_task_getscheduler, | |
3090 | .task_movememory = smack_task_movememory, | |
3091 | .task_kill = smack_task_kill, | |
3092 | .task_wait = smack_task_wait, | |
e114e473 CS |
3093 | .task_to_inode = smack_task_to_inode, |
3094 | ||
3095 | .ipc_permission = smack_ipc_permission, | |
d20bdda6 | 3096 | .ipc_getsecid = smack_ipc_getsecid, |
e114e473 CS |
3097 | |
3098 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
3099 | .msg_msg_free_security = smack_msg_msg_free_security, | |
3100 | ||
3101 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
3102 | .msg_queue_free_security = smack_msg_queue_free_security, | |
3103 | .msg_queue_associate = smack_msg_queue_associate, | |
3104 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
3105 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
3106 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
3107 | ||
3108 | .shm_alloc_security = smack_shm_alloc_security, | |
3109 | .shm_free_security = smack_shm_free_security, | |
3110 | .shm_associate = smack_shm_associate, | |
3111 | .shm_shmctl = smack_shm_shmctl, | |
3112 | .shm_shmat = smack_shm_shmat, | |
3113 | ||
3114 | .sem_alloc_security = smack_sem_alloc_security, | |
3115 | .sem_free_security = smack_sem_free_security, | |
3116 | .sem_associate = smack_sem_associate, | |
3117 | .sem_semctl = smack_sem_semctl, | |
3118 | .sem_semop = smack_sem_semop, | |
3119 | ||
e114e473 CS |
3120 | .d_instantiate = smack_d_instantiate, |
3121 | ||
3122 | .getprocattr = smack_getprocattr, | |
3123 | .setprocattr = smack_setprocattr, | |
3124 | ||
3125 | .unix_stream_connect = smack_unix_stream_connect, | |
3126 | .unix_may_send = smack_unix_may_send, | |
3127 | ||
3128 | .socket_post_create = smack_socket_post_create, | |
6d3dc07c CS |
3129 | .socket_connect = smack_socket_connect, |
3130 | .socket_sendmsg = smack_socket_sendmsg, | |
e114e473 CS |
3131 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, |
3132 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
3133 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
3134 | .sk_alloc_security = smack_sk_alloc_security, | |
3135 | .sk_free_security = smack_sk_free_security, | |
3136 | .sock_graft = smack_sock_graft, | |
3137 | .inet_conn_request = smack_inet_conn_request, | |
07feee8f | 3138 | .inet_csk_clone = smack_inet_csk_clone, |
d20bdda6 | 3139 | |
e114e473 CS |
3140 | /* key management security hooks */ |
3141 | #ifdef CONFIG_KEYS | |
3142 | .key_alloc = smack_key_alloc, | |
3143 | .key_free = smack_key_free, | |
3144 | .key_permission = smack_key_permission, | |
3145 | #endif /* CONFIG_KEYS */ | |
d20bdda6 AD |
3146 | |
3147 | /* Audit hooks */ | |
3148 | #ifdef CONFIG_AUDIT | |
3149 | .audit_rule_init = smack_audit_rule_init, | |
3150 | .audit_rule_known = smack_audit_rule_known, | |
3151 | .audit_rule_match = smack_audit_rule_match, | |
3152 | .audit_rule_free = smack_audit_rule_free, | |
3153 | #endif /* CONFIG_AUDIT */ | |
3154 | ||
e114e473 | 3155 | .secid_to_secctx = smack_secid_to_secctx, |
4bc87e62 | 3156 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 CS |
3157 | .release_secctx = smack_release_secctx, |
3158 | }; | |
3159 | ||
7198e2ee EB |
3160 | |
3161 | static __init void init_smack_know_list(void) | |
3162 | { | |
3163 | list_add(&smack_known_huh.list, &smack_known_list); | |
3164 | list_add(&smack_known_hat.list, &smack_known_list); | |
3165 | list_add(&smack_known_star.list, &smack_known_list); | |
3166 | list_add(&smack_known_floor.list, &smack_known_list); | |
3167 | list_add(&smack_known_invalid.list, &smack_known_list); | |
3168 | list_add(&smack_known_web.list, &smack_known_list); | |
3169 | } | |
3170 | ||
e114e473 CS |
3171 | /** |
3172 | * smack_init - initialize the smack system | |
3173 | * | |
3174 | * Returns 0 | |
3175 | */ | |
3176 | static __init int smack_init(void) | |
3177 | { | |
d84f4f99 DH |
3178 | struct cred *cred; |
3179 | ||
076c54c5 AD |
3180 | if (!security_module_enable(&smack_ops)) |
3181 | return 0; | |
3182 | ||
e114e473 CS |
3183 | printk(KERN_INFO "Smack: Initializing.\n"); |
3184 | ||
3185 | /* | |
3186 | * Set the security state for the initial task. | |
3187 | */ | |
d84f4f99 DH |
3188 | cred = (struct cred *) current->cred; |
3189 | cred->security = &smack_known_floor.smk_known; | |
e114e473 | 3190 | |
7198e2ee EB |
3191 | /* initilize the smack_know_list */ |
3192 | init_smack_know_list(); | |
e114e473 CS |
3193 | /* |
3194 | * Initialize locks | |
3195 | */ | |
e114e473 CS |
3196 | spin_lock_init(&smack_known_huh.smk_cipsolock); |
3197 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
3198 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
3199 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
3200 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
3201 | ||
3202 | /* | |
3203 | * Register with LSM | |
3204 | */ | |
3205 | if (register_security(&smack_ops)) | |
3206 | panic("smack: Unable to register with kernel.\n"); | |
3207 | ||
3208 | return 0; | |
3209 | } | |
3210 | ||
3211 | /* | |
3212 | * Smack requires early initialization in order to label | |
3213 | * all processes and objects when they are created. | |
3214 | */ | |
3215 | security_initcall(smack_init); |