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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> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2, | |
13 | * as published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/xattr.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/mount.h> | |
19 | #include <linux/stat.h> | |
20 | #include <linux/ext2_fs.h> | |
21 | #include <linux/kd.h> | |
22 | #include <asm/ioctls.h> | |
23 | #include <linux/tcp.h> | |
24 | #include <linux/udp.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/pipe_fs_i.h> | |
27 | #include <net/netlabel.h> | |
28 | #include <net/cipso_ipv4.h> | |
29 | ||
30 | #include "smack.h" | |
31 | ||
32 | /* | |
33 | * I hope these are the hokeyist lines of code in the module. Casey. | |
34 | */ | |
35 | #define DEVPTS_SUPER_MAGIC 0x1cd1 | |
36 | #define SOCKFS_MAGIC 0x534F434B | |
37 | #define TMPFS_MAGIC 0x01021994 | |
38 | ||
39 | /** | |
40 | * smk_fetch - Fetch the smack label from a file. | |
41 | * @ip: a pointer to the inode | |
42 | * @dp: a pointer to the dentry | |
43 | * | |
44 | * Returns a pointer to the master list entry for the Smack label | |
45 | * or NULL if there was no label to fetch. | |
46 | */ | |
47 | static char *smk_fetch(struct inode *ip, struct dentry *dp) | |
48 | { | |
49 | int rc; | |
50 | char in[SMK_LABELLEN]; | |
51 | ||
52 | if (ip->i_op->getxattr == NULL) | |
53 | return NULL; | |
54 | ||
55 | rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); | |
56 | if (rc < 0) | |
57 | return NULL; | |
58 | ||
59 | return smk_import(in, rc); | |
60 | } | |
61 | ||
62 | /** | |
63 | * new_inode_smack - allocate an inode security blob | |
64 | * @smack: a pointer to the Smack label to use in the blob | |
65 | * | |
66 | * Returns the new blob or NULL if there's no memory available | |
67 | */ | |
68 | struct inode_smack *new_inode_smack(char *smack) | |
69 | { | |
70 | struct inode_smack *isp; | |
71 | ||
72 | isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); | |
73 | if (isp == NULL) | |
74 | return NULL; | |
75 | ||
76 | isp->smk_inode = smack; | |
77 | isp->smk_flags = 0; | |
78 | mutex_init(&isp->smk_lock); | |
79 | ||
80 | return isp; | |
81 | } | |
82 | ||
83 | /* | |
84 | * LSM hooks. | |
85 | * We he, that is fun! | |
86 | */ | |
87 | ||
88 | /** | |
89 | * smack_ptrace - Smack approval on ptrace | |
90 | * @ptp: parent task pointer | |
91 | * @ctp: child task pointer | |
92 | * | |
93 | * Returns 0 if access is OK, an error code otherwise | |
94 | * | |
95 | * Do the capability checks, and require read and write. | |
96 | */ | |
97 | static int smack_ptrace(struct task_struct *ptp, struct task_struct *ctp) | |
98 | { | |
99 | int rc; | |
100 | ||
101 | rc = cap_ptrace(ptp, ctp); | |
102 | if (rc != 0) | |
103 | return rc; | |
104 | ||
105 | rc = smk_access(ptp->security, ctp->security, MAY_READWRITE); | |
106 | if (rc != 0 && __capable(ptp, CAP_MAC_OVERRIDE)) | |
107 | return 0; | |
108 | ||
109 | return rc; | |
110 | } | |
111 | ||
112 | /** | |
113 | * smack_syslog - Smack approval on syslog | |
114 | * @type: message type | |
115 | * | |
116 | * Require that the task has the floor label | |
117 | * | |
118 | * Returns 0 on success, error code otherwise. | |
119 | */ | |
120 | static int smack_syslog(int type) | |
121 | { | |
122 | int rc; | |
123 | char *sp = current->security; | |
124 | ||
125 | rc = cap_syslog(type); | |
126 | if (rc != 0) | |
127 | return rc; | |
128 | ||
129 | if (capable(CAP_MAC_OVERRIDE)) | |
130 | return 0; | |
131 | ||
132 | if (sp != smack_known_floor.smk_known) | |
133 | rc = -EACCES; | |
134 | ||
135 | return rc; | |
136 | } | |
137 | ||
138 | ||
139 | /* | |
140 | * Superblock Hooks. | |
141 | */ | |
142 | ||
143 | /** | |
144 | * smack_sb_alloc_security - allocate a superblock blob | |
145 | * @sb: the superblock getting the blob | |
146 | * | |
147 | * Returns 0 on success or -ENOMEM on error. | |
148 | */ | |
149 | static int smack_sb_alloc_security(struct super_block *sb) | |
150 | { | |
151 | struct superblock_smack *sbsp; | |
152 | ||
153 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
154 | ||
155 | if (sbsp == NULL) | |
156 | return -ENOMEM; | |
157 | ||
158 | sbsp->smk_root = smack_known_floor.smk_known; | |
159 | sbsp->smk_default = smack_known_floor.smk_known; | |
160 | sbsp->smk_floor = smack_known_floor.smk_known; | |
161 | sbsp->smk_hat = smack_known_hat.smk_known; | |
162 | sbsp->smk_initialized = 0; | |
163 | spin_lock_init(&sbsp->smk_sblock); | |
164 | ||
165 | sb->s_security = sbsp; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * smack_sb_free_security - free a superblock blob | |
172 | * @sb: the superblock getting the blob | |
173 | * | |
174 | */ | |
175 | static void smack_sb_free_security(struct super_block *sb) | |
176 | { | |
177 | kfree(sb->s_security); | |
178 | sb->s_security = NULL; | |
179 | } | |
180 | ||
181 | /** | |
182 | * smack_sb_copy_data - copy mount options data for processing | |
183 | * @type: file system type | |
184 | * @orig: where to start | |
185 | * @smackopts | |
186 | * | |
187 | * Returns 0 on success or -ENOMEM on error. | |
188 | * | |
189 | * Copy the Smack specific mount options out of the mount | |
190 | * options list. | |
191 | */ | |
e0007529 | 192 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
193 | { |
194 | char *cp, *commap, *otheropts, *dp; | |
195 | ||
e114e473 CS |
196 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
197 | if (otheropts == NULL) | |
198 | return -ENOMEM; | |
199 | ||
200 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
201 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
202 | dp = smackopts; | |
203 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
204 | dp = smackopts; | |
205 | else if (strstr(cp, SMK_FSHAT) == cp) | |
206 | dp = smackopts; | |
207 | else if (strstr(cp, SMK_FSROOT) == cp) | |
208 | dp = smackopts; | |
209 | else | |
210 | dp = otheropts; | |
211 | ||
212 | commap = strchr(cp, ','); | |
213 | if (commap != NULL) | |
214 | *commap = '\0'; | |
215 | ||
216 | if (*dp != '\0') | |
217 | strcat(dp, ","); | |
218 | strcat(dp, cp); | |
219 | } | |
220 | ||
221 | strcpy(orig, otheropts); | |
222 | free_page((unsigned long)otheropts); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | /** | |
228 | * smack_sb_kern_mount - Smack specific mount processing | |
229 | * @sb: the file system superblock | |
230 | * @data: the smack mount options | |
231 | * | |
232 | * Returns 0 on success, an error code on failure | |
233 | */ | |
234 | static int smack_sb_kern_mount(struct super_block *sb, void *data) | |
235 | { | |
236 | struct dentry *root = sb->s_root; | |
237 | struct inode *inode = root->d_inode; | |
238 | struct superblock_smack *sp = sb->s_security; | |
239 | struct inode_smack *isp; | |
240 | char *op; | |
241 | char *commap; | |
242 | char *nsp; | |
243 | ||
244 | spin_lock(&sp->smk_sblock); | |
245 | if (sp->smk_initialized != 0) { | |
246 | spin_unlock(&sp->smk_sblock); | |
247 | return 0; | |
248 | } | |
249 | sp->smk_initialized = 1; | |
250 | spin_unlock(&sp->smk_sblock); | |
251 | ||
252 | for (op = data; op != NULL; op = commap) { | |
253 | commap = strchr(op, ','); | |
254 | if (commap != NULL) | |
255 | *commap++ = '\0'; | |
256 | ||
257 | if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { | |
258 | op += strlen(SMK_FSHAT); | |
259 | nsp = smk_import(op, 0); | |
260 | if (nsp != NULL) | |
261 | sp->smk_hat = nsp; | |
262 | } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { | |
263 | op += strlen(SMK_FSFLOOR); | |
264 | nsp = smk_import(op, 0); | |
265 | if (nsp != NULL) | |
266 | sp->smk_floor = nsp; | |
267 | } else if (strncmp(op, SMK_FSDEFAULT, | |
268 | strlen(SMK_FSDEFAULT)) == 0) { | |
269 | op += strlen(SMK_FSDEFAULT); | |
270 | nsp = smk_import(op, 0); | |
271 | if (nsp != NULL) | |
272 | sp->smk_default = nsp; | |
273 | } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { | |
274 | op += strlen(SMK_FSROOT); | |
275 | nsp = smk_import(op, 0); | |
276 | if (nsp != NULL) | |
277 | sp->smk_root = nsp; | |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * Initialize the root inode. | |
283 | */ | |
284 | isp = inode->i_security; | |
285 | if (isp == NULL) | |
286 | inode->i_security = new_inode_smack(sp->smk_root); | |
287 | else | |
288 | isp->smk_inode = sp->smk_root; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | /** | |
294 | * smack_sb_statfs - Smack check on statfs | |
295 | * @dentry: identifies the file system in question | |
296 | * | |
297 | * Returns 0 if current can read the floor of the filesystem, | |
298 | * and error code otherwise | |
299 | */ | |
300 | static int smack_sb_statfs(struct dentry *dentry) | |
301 | { | |
302 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
303 | ||
304 | return smk_curacc(sbp->smk_floor, MAY_READ); | |
305 | } | |
306 | ||
307 | /** | |
308 | * smack_sb_mount - Smack check for mounting | |
309 | * @dev_name: unused | |
310 | * @nd: mount point | |
311 | * @type: unused | |
312 | * @flags: unused | |
313 | * @data: unused | |
314 | * | |
315 | * Returns 0 if current can write the floor of the filesystem | |
316 | * being mounted on, an error code otherwise. | |
317 | */ | |
318 | static int smack_sb_mount(char *dev_name, struct nameidata *nd, | |
319 | char *type, unsigned long flags, void *data) | |
320 | { | |
4ac91378 | 321 | struct superblock_smack *sbp = nd->path.mnt->mnt_sb->s_security; |
e114e473 CS |
322 | |
323 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
324 | } | |
325 | ||
326 | /** | |
327 | * smack_sb_umount - Smack check for unmounting | |
328 | * @mnt: file system to unmount | |
329 | * @flags: unused | |
330 | * | |
331 | * Returns 0 if current can write the floor of the filesystem | |
332 | * being unmounted, an error code otherwise. | |
333 | */ | |
334 | static int smack_sb_umount(struct vfsmount *mnt, int flags) | |
335 | { | |
336 | struct superblock_smack *sbp; | |
337 | ||
338 | sbp = mnt->mnt_sb->s_security; | |
339 | ||
340 | return smk_curacc(sbp->smk_floor, MAY_WRITE); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Inode hooks | |
345 | */ | |
346 | ||
347 | /** | |
348 | * smack_inode_alloc_security - allocate an inode blob | |
349 | * @inode - the inode in need of a blob | |
350 | * | |
351 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
352 | */ | |
353 | static int smack_inode_alloc_security(struct inode *inode) | |
354 | { | |
355 | inode->i_security = new_inode_smack(current->security); | |
356 | if (inode->i_security == NULL) | |
357 | return -ENOMEM; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | /** | |
362 | * smack_inode_free_security - free an inode blob | |
363 | * @inode - the inode with a blob | |
364 | * | |
365 | * Clears the blob pointer in inode | |
366 | */ | |
367 | static void smack_inode_free_security(struct inode *inode) | |
368 | { | |
369 | kfree(inode->i_security); | |
370 | inode->i_security = NULL; | |
371 | } | |
372 | ||
373 | /** | |
374 | * smack_inode_init_security - copy out the smack from an inode | |
375 | * @inode: the inode | |
376 | * @dir: unused | |
377 | * @name: where to put the attribute name | |
378 | * @value: where to put the attribute value | |
379 | * @len: where to put the length of the attribute | |
380 | * | |
381 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
382 | */ | |
383 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
384 | char **name, void **value, size_t *len) | |
385 | { | |
386 | char *isp = smk_of_inode(inode); | |
387 | ||
388 | if (name) { | |
389 | *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); | |
390 | if (*name == NULL) | |
391 | return -ENOMEM; | |
392 | } | |
393 | ||
394 | if (value) { | |
395 | *value = kstrdup(isp, GFP_KERNEL); | |
396 | if (*value == NULL) | |
397 | return -ENOMEM; | |
398 | } | |
399 | ||
400 | if (len) | |
401 | *len = strlen(isp) + 1; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /** | |
407 | * smack_inode_link - Smack check on link | |
408 | * @old_dentry: the existing object | |
409 | * @dir: unused | |
410 | * @new_dentry: the new object | |
411 | * | |
412 | * Returns 0 if access is permitted, an error code otherwise | |
413 | */ | |
414 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
415 | struct dentry *new_dentry) | |
416 | { | |
417 | int rc; | |
418 | char *isp; | |
419 | ||
420 | isp = smk_of_inode(old_dentry->d_inode); | |
421 | rc = smk_curacc(isp, MAY_WRITE); | |
422 | ||
423 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
424 | isp = smk_of_inode(new_dentry->d_inode); | |
425 | rc = smk_curacc(isp, MAY_WRITE); | |
426 | } | |
427 | ||
428 | return rc; | |
429 | } | |
430 | ||
431 | /** | |
432 | * smack_inode_unlink - Smack check on inode deletion | |
433 | * @dir: containing directory object | |
434 | * @dentry: file to unlink | |
435 | * | |
436 | * Returns 0 if current can write the containing directory | |
437 | * and the object, error code otherwise | |
438 | */ | |
439 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
440 | { | |
441 | struct inode *ip = dentry->d_inode; | |
442 | int rc; | |
443 | ||
444 | /* | |
445 | * You need write access to the thing you're unlinking | |
446 | */ | |
447 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE); | |
448 | if (rc == 0) | |
449 | /* | |
450 | * You also need write access to the containing directory | |
451 | */ | |
452 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
453 | ||
454 | return rc; | |
455 | } | |
456 | ||
457 | /** | |
458 | * smack_inode_rmdir - Smack check on directory deletion | |
459 | * @dir: containing directory object | |
460 | * @dentry: directory to unlink | |
461 | * | |
462 | * Returns 0 if current can write the containing directory | |
463 | * and the directory, error code otherwise | |
464 | */ | |
465 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
466 | { | |
467 | int rc; | |
468 | ||
469 | /* | |
470 | * You need write access to the thing you're removing | |
471 | */ | |
472 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
473 | if (rc == 0) | |
474 | /* | |
475 | * You also need write access to the containing directory | |
476 | */ | |
477 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE); | |
478 | ||
479 | return rc; | |
480 | } | |
481 | ||
482 | /** | |
483 | * smack_inode_rename - Smack check on rename | |
484 | * @old_inode: the old directory | |
485 | * @old_dentry: unused | |
486 | * @new_inode: the new directory | |
487 | * @new_dentry: unused | |
488 | * | |
489 | * Read and write access is required on both the old and | |
490 | * new directories. | |
491 | * | |
492 | * Returns 0 if access is permitted, an error code otherwise | |
493 | */ | |
494 | static int smack_inode_rename(struct inode *old_inode, | |
495 | struct dentry *old_dentry, | |
496 | struct inode *new_inode, | |
497 | struct dentry *new_dentry) | |
498 | { | |
499 | int rc; | |
500 | char *isp; | |
501 | ||
502 | isp = smk_of_inode(old_dentry->d_inode); | |
503 | rc = smk_curacc(isp, MAY_READWRITE); | |
504 | ||
505 | if (rc == 0 && new_dentry->d_inode != NULL) { | |
506 | isp = smk_of_inode(new_dentry->d_inode); | |
507 | rc = smk_curacc(isp, MAY_READWRITE); | |
508 | } | |
509 | ||
510 | return rc; | |
511 | } | |
512 | ||
513 | /** | |
514 | * smack_inode_permission - Smack version of permission() | |
515 | * @inode: the inode in question | |
516 | * @mask: the access requested | |
517 | * @nd: unused | |
518 | * | |
519 | * This is the important Smack hook. | |
520 | * | |
521 | * Returns 0 if access is permitted, -EACCES otherwise | |
522 | */ | |
523 | static int smack_inode_permission(struct inode *inode, int mask, | |
524 | struct nameidata *nd) | |
525 | { | |
526 | /* | |
527 | * No permission to check. Existence test. Yup, it's there. | |
528 | */ | |
529 | if (mask == 0) | |
530 | return 0; | |
531 | ||
532 | return smk_curacc(smk_of_inode(inode), mask); | |
533 | } | |
534 | ||
535 | /** | |
536 | * smack_inode_setattr - Smack check for setting attributes | |
537 | * @dentry: the object | |
538 | * @iattr: for the force flag | |
539 | * | |
540 | * Returns 0 if access is permitted, an error code otherwise | |
541 | */ | |
542 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
543 | { | |
544 | /* | |
545 | * Need to allow for clearing the setuid bit. | |
546 | */ | |
547 | if (iattr->ia_valid & ATTR_FORCE) | |
548 | return 0; | |
549 | ||
550 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
551 | } | |
552 | ||
553 | /** | |
554 | * smack_inode_getattr - Smack check for getting attributes | |
555 | * @mnt: unused | |
556 | * @dentry: the object | |
557 | * | |
558 | * Returns 0 if access is permitted, an error code otherwise | |
559 | */ | |
560 | static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
561 | { | |
562 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
563 | } | |
564 | ||
565 | /** | |
566 | * smack_inode_setxattr - Smack check for setting xattrs | |
567 | * @dentry: the object | |
568 | * @name: name of the attribute | |
569 | * @value: unused | |
570 | * @size: unused | |
571 | * @flags: unused | |
572 | * | |
573 | * This protects the Smack attribute explicitly. | |
574 | * | |
575 | * Returns 0 if access is permitted, an error code otherwise | |
576 | */ | |
577 | static int smack_inode_setxattr(struct dentry *dentry, char *name, | |
578 | void *value, size_t size, int flags) | |
579 | { | |
bcdca225 | 580 | int rc = 0; |
e114e473 | 581 | |
bcdca225 CS |
582 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
583 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
584 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
585 | if (!capable(CAP_MAC_ADMIN)) | |
586 | rc = -EPERM; | |
587 | } else | |
588 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
589 | ||
590 | if (rc == 0) | |
591 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
592 | ||
593 | return rc; | |
e114e473 CS |
594 | } |
595 | ||
596 | /** | |
597 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
598 | * @dentry: object | |
599 | * @name: attribute name | |
600 | * @value: attribute value | |
601 | * @size: attribute size | |
602 | * @flags: unused | |
603 | * | |
604 | * Set the pointer in the inode blob to the entry found | |
605 | * in the master label list. | |
606 | */ | |
607 | static void smack_inode_post_setxattr(struct dentry *dentry, char *name, | |
608 | void *value, size_t size, int flags) | |
609 | { | |
610 | struct inode_smack *isp; | |
611 | char *nsp; | |
612 | ||
613 | /* | |
614 | * Not SMACK | |
615 | */ | |
616 | if (strcmp(name, XATTR_NAME_SMACK)) | |
617 | return; | |
618 | ||
619 | if (size >= SMK_LABELLEN) | |
620 | return; | |
621 | ||
622 | isp = dentry->d_inode->i_security; | |
623 | ||
624 | /* | |
625 | * No locking is done here. This is a pointer | |
626 | * assignment. | |
627 | */ | |
628 | nsp = smk_import(value, size); | |
629 | if (nsp != NULL) | |
630 | isp->smk_inode = nsp; | |
631 | else | |
632 | isp->smk_inode = smack_known_invalid.smk_known; | |
633 | ||
634 | return; | |
635 | } | |
636 | ||
637 | /* | |
638 | * smack_inode_getxattr - Smack check on getxattr | |
639 | * @dentry: the object | |
640 | * @name: unused | |
641 | * | |
642 | * Returns 0 if access is permitted, an error code otherwise | |
643 | */ | |
644 | static int smack_inode_getxattr(struct dentry *dentry, char *name) | |
645 | { | |
646 | return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ); | |
647 | } | |
648 | ||
649 | /* | |
650 | * smack_inode_removexattr - Smack check on removexattr | |
651 | * @dentry: the object | |
652 | * @name: name of the attribute | |
653 | * | |
654 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
655 | * | |
656 | * Returns 0 if access is permitted, an error code otherwise | |
657 | */ | |
658 | static int smack_inode_removexattr(struct dentry *dentry, char *name) | |
659 | { | |
bcdca225 | 660 | int rc = 0; |
e114e473 | 661 | |
bcdca225 CS |
662 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
663 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
664 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { | |
665 | if (!capable(CAP_MAC_ADMIN)) | |
666 | rc = -EPERM; | |
667 | } else | |
668 | rc = cap_inode_removexattr(dentry, name); | |
669 | ||
670 | if (rc == 0) | |
671 | rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE); | |
672 | ||
673 | return rc; | |
e114e473 CS |
674 | } |
675 | ||
676 | /** | |
677 | * smack_inode_getsecurity - get smack xattrs | |
678 | * @inode: the object | |
679 | * @name: attribute name | |
680 | * @buffer: where to put the result | |
681 | * @size: size of the buffer | |
682 | * @err: unused | |
683 | * | |
684 | * Returns the size of the attribute or an error code | |
685 | */ | |
686 | static int smack_inode_getsecurity(const struct inode *inode, | |
687 | const char *name, void **buffer, | |
688 | bool alloc) | |
689 | { | |
690 | struct socket_smack *ssp; | |
691 | struct socket *sock; | |
692 | struct super_block *sbp; | |
693 | struct inode *ip = (struct inode *)inode; | |
694 | char *isp; | |
695 | int ilen; | |
696 | int rc = 0; | |
697 | ||
698 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
699 | isp = smk_of_inode(inode); | |
700 | ilen = strlen(isp) + 1; | |
701 | *buffer = isp; | |
702 | return ilen; | |
703 | } | |
704 | ||
705 | /* | |
706 | * The rest of the Smack xattrs are only on sockets. | |
707 | */ | |
708 | sbp = ip->i_sb; | |
709 | if (sbp->s_magic != SOCKFS_MAGIC) | |
710 | return -EOPNOTSUPP; | |
711 | ||
712 | sock = SOCKET_I(ip); | |
2e1d146a | 713 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
714 | return -EOPNOTSUPP; |
715 | ||
716 | ssp = sock->sk->sk_security; | |
717 | ||
718 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
719 | isp = ssp->smk_in; | |
720 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
721 | isp = ssp->smk_out; | |
722 | else | |
723 | return -EOPNOTSUPP; | |
724 | ||
725 | ilen = strlen(isp) + 1; | |
726 | if (rc == 0) { | |
727 | *buffer = isp; | |
728 | rc = ilen; | |
729 | } | |
730 | ||
731 | return rc; | |
732 | } | |
733 | ||
734 | ||
735 | /** | |
736 | * smack_inode_listsecurity - list the Smack attributes | |
737 | * @inode: the object | |
738 | * @buffer: where they go | |
739 | * @buffer_size: size of buffer | |
740 | * | |
741 | * Returns 0 on success, -EINVAL otherwise | |
742 | */ | |
743 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
744 | size_t buffer_size) | |
745 | { | |
746 | int len = strlen(XATTR_NAME_SMACK); | |
747 | ||
748 | if (buffer != NULL && len <= buffer_size) { | |
749 | memcpy(buffer, XATTR_NAME_SMACK, len); | |
750 | return len; | |
751 | } | |
752 | return -EINVAL; | |
753 | } | |
754 | ||
755 | /* | |
756 | * File Hooks | |
757 | */ | |
758 | ||
759 | /** | |
760 | * smack_file_permission - Smack check on file operations | |
761 | * @file: unused | |
762 | * @mask: unused | |
763 | * | |
764 | * Returns 0 | |
765 | * | |
766 | * Should access checks be done on each read or write? | |
767 | * UNICOS and SELinux say yes. | |
768 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
769 | * | |
770 | * I'll say no for now. Smack does not do the frequent | |
771 | * label changing that SELinux does. | |
772 | */ | |
773 | static int smack_file_permission(struct file *file, int mask) | |
774 | { | |
775 | return 0; | |
776 | } | |
777 | ||
778 | /** | |
779 | * smack_file_alloc_security - assign a file security blob | |
780 | * @file: the object | |
781 | * | |
782 | * The security blob for a file is a pointer to the master | |
783 | * label list, so no allocation is done. | |
784 | * | |
785 | * Returns 0 | |
786 | */ | |
787 | static int smack_file_alloc_security(struct file *file) | |
788 | { | |
789 | file->f_security = current->security; | |
790 | return 0; | |
791 | } | |
792 | ||
793 | /** | |
794 | * smack_file_free_security - clear a file security blob | |
795 | * @file: the object | |
796 | * | |
797 | * The security blob for a file is a pointer to the master | |
798 | * label list, so no memory is freed. | |
799 | */ | |
800 | static void smack_file_free_security(struct file *file) | |
801 | { | |
802 | file->f_security = NULL; | |
803 | } | |
804 | ||
805 | /** | |
806 | * smack_file_ioctl - Smack check on ioctls | |
807 | * @file: the object | |
808 | * @cmd: what to do | |
809 | * @arg: unused | |
810 | * | |
811 | * Relies heavily on the correct use of the ioctl command conventions. | |
812 | * | |
813 | * Returns 0 if allowed, error code otherwise | |
814 | */ | |
815 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
816 | unsigned long arg) | |
817 | { | |
818 | int rc = 0; | |
819 | ||
820 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
821 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
822 | ||
823 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) | |
824 | rc = smk_curacc(file->f_security, MAY_READ); | |
825 | ||
826 | return rc; | |
827 | } | |
828 | ||
829 | /** | |
830 | * smack_file_lock - Smack check on file locking | |
831 | * @file: the object | |
832 | * @cmd unused | |
833 | * | |
834 | * Returns 0 if current has write access, error code otherwise | |
835 | */ | |
836 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
837 | { | |
838 | return smk_curacc(file->f_security, MAY_WRITE); | |
839 | } | |
840 | ||
841 | /** | |
842 | * smack_file_fcntl - Smack check on fcntl | |
843 | * @file: the object | |
844 | * @cmd: what action to check | |
845 | * @arg: unused | |
846 | * | |
847 | * Returns 0 if current has access, error code otherwise | |
848 | */ | |
849 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
850 | unsigned long arg) | |
851 | { | |
852 | int rc; | |
853 | ||
854 | switch (cmd) { | |
855 | case F_DUPFD: | |
856 | case F_GETFD: | |
857 | case F_GETFL: | |
858 | case F_GETLK: | |
859 | case F_GETOWN: | |
860 | case F_GETSIG: | |
861 | rc = smk_curacc(file->f_security, MAY_READ); | |
862 | break; | |
863 | case F_SETFD: | |
864 | case F_SETFL: | |
865 | case F_SETLK: | |
866 | case F_SETLKW: | |
867 | case F_SETOWN: | |
868 | case F_SETSIG: | |
869 | rc = smk_curacc(file->f_security, MAY_WRITE); | |
870 | break; | |
871 | default: | |
872 | rc = smk_curacc(file->f_security, MAY_READWRITE); | |
873 | } | |
874 | ||
875 | return rc; | |
876 | } | |
877 | ||
878 | /** | |
879 | * smack_file_set_fowner - set the file security blob value | |
880 | * @file: object in question | |
881 | * | |
882 | * Returns 0 | |
883 | * Further research may be required on this one. | |
884 | */ | |
885 | static int smack_file_set_fowner(struct file *file) | |
886 | { | |
887 | file->f_security = current->security; | |
888 | return 0; | |
889 | } | |
890 | ||
891 | /** | |
892 | * smack_file_send_sigiotask - Smack on sigio | |
893 | * @tsk: The target task | |
894 | * @fown: the object the signal come from | |
895 | * @signum: unused | |
896 | * | |
897 | * Allow a privileged task to get signals even if it shouldn't | |
898 | * | |
899 | * Returns 0 if a subject with the object's smack could | |
900 | * write to the task, an error code otherwise. | |
901 | */ | |
902 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
903 | struct fown_struct *fown, int signum) | |
904 | { | |
905 | struct file *file; | |
906 | int rc; | |
907 | ||
908 | /* | |
909 | * struct fown_struct is never outside the context of a struct file | |
910 | */ | |
911 | file = container_of(fown, struct file, f_owner); | |
912 | rc = smk_access(file->f_security, tsk->security, MAY_WRITE); | |
913 | if (rc != 0 && __capable(tsk, CAP_MAC_OVERRIDE)) | |
914 | return 0; | |
915 | return rc; | |
916 | } | |
917 | ||
918 | /** | |
919 | * smack_file_receive - Smack file receive check | |
920 | * @file: the object | |
921 | * | |
922 | * Returns 0 if current has access, error code otherwise | |
923 | */ | |
924 | static int smack_file_receive(struct file *file) | |
925 | { | |
926 | int may = 0; | |
927 | ||
928 | /* | |
929 | * This code relies on bitmasks. | |
930 | */ | |
931 | if (file->f_mode & FMODE_READ) | |
932 | may = MAY_READ; | |
933 | if (file->f_mode & FMODE_WRITE) | |
934 | may |= MAY_WRITE; | |
935 | ||
936 | return smk_curacc(file->f_security, may); | |
937 | } | |
938 | ||
939 | /* | |
940 | * Task hooks | |
941 | */ | |
942 | ||
943 | /** | |
944 | * smack_task_alloc_security - "allocate" a task blob | |
945 | * @tsk: the task in need of a blob | |
946 | * | |
947 | * Smack isn't using copies of blobs. Everyone | |
948 | * points to an immutable list. No alloc required. | |
949 | * No data copy required. | |
950 | * | |
951 | * Always returns 0 | |
952 | */ | |
953 | static int smack_task_alloc_security(struct task_struct *tsk) | |
954 | { | |
955 | tsk->security = current->security; | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | /** | |
961 | * smack_task_free_security - "free" a task blob | |
962 | * @task: the task with the blob | |
963 | * | |
964 | * Smack isn't using copies of blobs. Everyone | |
965 | * points to an immutable list. The blobs never go away. | |
966 | * There is no leak here. | |
967 | */ | |
968 | static void smack_task_free_security(struct task_struct *task) | |
969 | { | |
970 | task->security = NULL; | |
971 | } | |
972 | ||
973 | /** | |
974 | * smack_task_setpgid - Smack check on setting pgid | |
975 | * @p: the task object | |
976 | * @pgid: unused | |
977 | * | |
978 | * Return 0 if write access is permitted | |
979 | */ | |
980 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
981 | { | |
982 | return smk_curacc(p->security, MAY_WRITE); | |
983 | } | |
984 | ||
985 | /** | |
986 | * smack_task_getpgid - Smack access check for getpgid | |
987 | * @p: the object task | |
988 | * | |
989 | * Returns 0 if current can read the object task, error code otherwise | |
990 | */ | |
991 | static int smack_task_getpgid(struct task_struct *p) | |
992 | { | |
993 | return smk_curacc(p->security, MAY_READ); | |
994 | } | |
995 | ||
996 | /** | |
997 | * smack_task_getsid - Smack access check for getsid | |
998 | * @p: the object task | |
999 | * | |
1000 | * Returns 0 if current can read the object task, error code otherwise | |
1001 | */ | |
1002 | static int smack_task_getsid(struct task_struct *p) | |
1003 | { | |
1004 | return smk_curacc(p->security, MAY_READ); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * smack_task_getsecid - get the secid of the task | |
1009 | * @p: the object task | |
1010 | * @secid: where to put the result | |
1011 | * | |
1012 | * Sets the secid to contain a u32 version of the smack label. | |
1013 | */ | |
1014 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
1015 | { | |
1016 | *secid = smack_to_secid(p->security); | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * smack_task_setnice - Smack check on setting nice | |
1021 | * @p: the task object | |
1022 | * @nice: unused | |
1023 | * | |
1024 | * Return 0 if write access is permitted | |
1025 | */ | |
1026 | static int smack_task_setnice(struct task_struct *p, int nice) | |
1027 | { | |
bcdca225 CS |
1028 | int rc; |
1029 | ||
1030 | rc = cap_task_setnice(p, nice); | |
1031 | if (rc == 0) | |
1032 | rc = smk_curacc(p->security, MAY_WRITE); | |
1033 | return rc; | |
e114e473 CS |
1034 | } |
1035 | ||
1036 | /** | |
1037 | * smack_task_setioprio - Smack check on setting ioprio | |
1038 | * @p: the task object | |
1039 | * @ioprio: unused | |
1040 | * | |
1041 | * Return 0 if write access is permitted | |
1042 | */ | |
1043 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
1044 | { | |
bcdca225 CS |
1045 | int rc; |
1046 | ||
1047 | rc = cap_task_setioprio(p, ioprio); | |
1048 | if (rc == 0) | |
1049 | rc = smk_curacc(p->security, MAY_WRITE); | |
1050 | return rc; | |
e114e473 CS |
1051 | } |
1052 | ||
1053 | /** | |
1054 | * smack_task_getioprio - Smack check on reading ioprio | |
1055 | * @p: the task object | |
1056 | * | |
1057 | * Return 0 if read access is permitted | |
1058 | */ | |
1059 | static int smack_task_getioprio(struct task_struct *p) | |
1060 | { | |
1061 | return smk_curacc(p->security, MAY_READ); | |
1062 | } | |
1063 | ||
1064 | /** | |
1065 | * smack_task_setscheduler - Smack check on setting scheduler | |
1066 | * @p: the task object | |
1067 | * @policy: unused | |
1068 | * @lp: unused | |
1069 | * | |
1070 | * Return 0 if read access is permitted | |
1071 | */ | |
1072 | static int smack_task_setscheduler(struct task_struct *p, int policy, | |
1073 | struct sched_param *lp) | |
1074 | { | |
bcdca225 CS |
1075 | int rc; |
1076 | ||
1077 | rc = cap_task_setscheduler(p, policy, lp); | |
1078 | if (rc == 0) | |
1079 | rc = smk_curacc(p->security, MAY_WRITE); | |
1080 | return rc; | |
e114e473 CS |
1081 | } |
1082 | ||
1083 | /** | |
1084 | * smack_task_getscheduler - Smack check on reading scheduler | |
1085 | * @p: the task object | |
1086 | * | |
1087 | * Return 0 if read access is permitted | |
1088 | */ | |
1089 | static int smack_task_getscheduler(struct task_struct *p) | |
1090 | { | |
1091 | return smk_curacc(p->security, MAY_READ); | |
1092 | } | |
1093 | ||
1094 | /** | |
1095 | * smack_task_movememory - Smack check on moving memory | |
1096 | * @p: the task object | |
1097 | * | |
1098 | * Return 0 if write access is permitted | |
1099 | */ | |
1100 | static int smack_task_movememory(struct task_struct *p) | |
1101 | { | |
1102 | return smk_curacc(p->security, MAY_WRITE); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * smack_task_kill - Smack check on signal delivery | |
1107 | * @p: the task object | |
1108 | * @info: unused | |
1109 | * @sig: unused | |
1110 | * @secid: identifies the smack to use in lieu of current's | |
1111 | * | |
1112 | * Return 0 if write access is permitted | |
1113 | * | |
1114 | * The secid behavior is an artifact of an SELinux hack | |
1115 | * in the USB code. Someday it may go away. | |
1116 | */ | |
1117 | static int smack_task_kill(struct task_struct *p, struct siginfo *info, | |
1118 | int sig, u32 secid) | |
1119 | { | |
1120 | /* | |
1121 | * Special cases where signals really ought to go through | |
1122 | * in spite of policy. Stephen Smalley suggests it may | |
1123 | * make sense to change the caller so that it doesn't | |
1124 | * bother with the LSM hook in these cases. | |
1125 | */ | |
1126 | if (info != SEND_SIG_NOINFO && | |
1127 | (is_si_special(info) || SI_FROMKERNEL(info))) | |
1128 | return 0; | |
1129 | /* | |
1130 | * Sending a signal requires that the sender | |
1131 | * can write the receiver. | |
1132 | */ | |
1133 | if (secid == 0) | |
1134 | return smk_curacc(p->security, MAY_WRITE); | |
1135 | /* | |
1136 | * If the secid isn't 0 we're dealing with some USB IO | |
1137 | * specific behavior. This is not clean. For one thing | |
1138 | * we can't take privilege into account. | |
1139 | */ | |
1140 | return smk_access(smack_from_secid(secid), p->security, MAY_WRITE); | |
1141 | } | |
1142 | ||
1143 | /** | |
1144 | * smack_task_wait - Smack access check for waiting | |
1145 | * @p: task to wait for | |
1146 | * | |
1147 | * Returns 0 if current can wait for p, error code otherwise | |
1148 | */ | |
1149 | static int smack_task_wait(struct task_struct *p) | |
1150 | { | |
1151 | int rc; | |
1152 | ||
1153 | rc = smk_access(current->security, p->security, MAY_WRITE); | |
1154 | if (rc == 0) | |
1155 | return 0; | |
1156 | ||
1157 | /* | |
1158 | * Allow the operation to succeed if either task | |
1159 | * has privilege to perform operations that might | |
1160 | * account for the smack labels having gotten to | |
1161 | * be different in the first place. | |
1162 | * | |
1163 | * This breaks the strict subjet/object access | |
1164 | * control ideal, taking the object's privilege | |
1165 | * state into account in the decision as well as | |
1166 | * the smack value. | |
1167 | */ | |
1168 | if (capable(CAP_MAC_OVERRIDE) || __capable(p, CAP_MAC_OVERRIDE)) | |
1169 | return 0; | |
1170 | ||
1171 | return rc; | |
1172 | } | |
1173 | ||
1174 | /** | |
1175 | * smack_task_to_inode - copy task smack into the inode blob | |
1176 | * @p: task to copy from | |
1177 | * inode: inode to copy to | |
1178 | * | |
1179 | * Sets the smack pointer in the inode security blob | |
1180 | */ | |
1181 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
1182 | { | |
1183 | struct inode_smack *isp = inode->i_security; | |
1184 | isp->smk_inode = p->security; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Socket hooks. | |
1189 | */ | |
1190 | ||
1191 | /** | |
1192 | * smack_sk_alloc_security - Allocate a socket blob | |
1193 | * @sk: the socket | |
1194 | * @family: unused | |
1195 | * @priority: memory allocation priority | |
1196 | * | |
1197 | * Assign Smack pointers to current | |
1198 | * | |
1199 | * Returns 0 on success, -ENOMEM is there's no memory | |
1200 | */ | |
1201 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
1202 | { | |
1203 | char *csp = current->security; | |
1204 | struct socket_smack *ssp; | |
1205 | ||
1206 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
1207 | if (ssp == NULL) | |
1208 | return -ENOMEM; | |
1209 | ||
1210 | ssp->smk_in = csp; | |
1211 | ssp->smk_out = csp; | |
1212 | ssp->smk_packet[0] = '\0'; | |
1213 | ||
1214 | sk->sk_security = ssp; | |
1215 | ||
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * smack_sk_free_security - Free a socket blob | |
1221 | * @sk: the socket | |
1222 | * | |
1223 | * Clears the blob pointer | |
1224 | */ | |
1225 | static void smack_sk_free_security(struct sock *sk) | |
1226 | { | |
1227 | kfree(sk->sk_security); | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * smack_set_catset - convert a capset to netlabel mls categories | |
1232 | * @catset: the Smack categories | |
1233 | * @sap: where to put the netlabel categories | |
1234 | * | |
1235 | * Allocates and fills attr.mls.cat | |
1236 | */ | |
1237 | static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) | |
1238 | { | |
1239 | unsigned char *cp; | |
1240 | unsigned char m; | |
1241 | int cat; | |
1242 | int rc; | |
1243 | int byte; | |
1244 | ||
1245 | if (catset == 0) | |
1246 | return; | |
1247 | ||
1248 | sap->flags |= NETLBL_SECATTR_MLS_CAT; | |
1249 | sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); | |
1250 | sap->attr.mls.cat->startbit = 0; | |
1251 | ||
1252 | for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) | |
1253 | for (m = 0x80; m != 0; m >>= 1, cat++) { | |
1254 | if ((m & *cp) == 0) | |
1255 | continue; | |
1256 | rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, | |
1257 | cat, GFP_ATOMIC); | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | /** | |
1262 | * smack_to_secattr - fill a secattr from a smack value | |
1263 | * @smack: the smack value | |
1264 | * @nlsp: where the result goes | |
1265 | * | |
1266 | * Casey says that CIPSO is good enough for now. | |
1267 | * It can be used to effect. | |
1268 | * It can also be abused to effect when necessary. | |
1269 | * Appologies to the TSIG group in general and GW in particular. | |
1270 | */ | |
1271 | static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) | |
1272 | { | |
1273 | struct smack_cipso cipso; | |
1274 | int rc; | |
1275 | ||
1276 | switch (smack_net_nltype) { | |
1277 | case NETLBL_NLTYPE_CIPSOV4: | |
4bc87e62 CS |
1278 | nlsp->domain = kstrdup(smack, GFP_ATOMIC); |
1279 | nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; | |
e114e473 CS |
1280 | |
1281 | rc = smack_to_cipso(smack, &cipso); | |
1282 | if (rc == 0) { | |
1283 | nlsp->attr.mls.lvl = cipso.smk_level; | |
1284 | smack_set_catset(cipso.smk_catset, nlsp); | |
1285 | } else { | |
1286 | nlsp->attr.mls.lvl = smack_cipso_direct; | |
1287 | smack_set_catset(smack, nlsp); | |
1288 | } | |
1289 | break; | |
1290 | default: | |
1291 | break; | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * smack_netlabel - Set the secattr on a socket | |
1297 | * @sk: the socket | |
1298 | * | |
1299 | * Convert the outbound smack value (smk_out) to a | |
1300 | * secattr and attach it to the socket. | |
1301 | * | |
1302 | * Returns 0 on success or an error code | |
1303 | */ | |
1304 | static int smack_netlabel(struct sock *sk) | |
1305 | { | |
2e1d146a | 1306 | struct socket_smack *ssp; |
e114e473 | 1307 | struct netlbl_lsm_secattr secattr; |
4bc87e62 | 1308 | int rc; |
e114e473 | 1309 | |
2e1d146a | 1310 | ssp = sk->sk_security; |
e114e473 CS |
1311 | netlbl_secattr_init(&secattr); |
1312 | smack_to_secattr(ssp->smk_out, &secattr); | |
4bc87e62 | 1313 | rc = netlbl_sock_setattr(sk, &secattr); |
e114e473 | 1314 | netlbl_secattr_destroy(&secattr); |
4bc87e62 | 1315 | |
e114e473 CS |
1316 | return rc; |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * smack_inode_setsecurity - set smack xattrs | |
1321 | * @inode: the object | |
1322 | * @name: attribute name | |
1323 | * @value: attribute value | |
1324 | * @size: size of the attribute | |
1325 | * @flags: unused | |
1326 | * | |
1327 | * Sets the named attribute in the appropriate blob | |
1328 | * | |
1329 | * Returns 0 on success, or an error code | |
1330 | */ | |
1331 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
1332 | const void *value, size_t size, int flags) | |
1333 | { | |
1334 | char *sp; | |
1335 | struct inode_smack *nsp = inode->i_security; | |
1336 | struct socket_smack *ssp; | |
1337 | struct socket *sock; | |
4bc87e62 | 1338 | int rc = 0; |
e114e473 CS |
1339 | |
1340 | if (value == NULL || size > SMK_LABELLEN) | |
1341 | return -EACCES; | |
1342 | ||
1343 | sp = smk_import(value, size); | |
1344 | if (sp == NULL) | |
1345 | return -EINVAL; | |
1346 | ||
1347 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
1348 | nsp->smk_inode = sp; | |
1349 | return 0; | |
1350 | } | |
1351 | /* | |
1352 | * The rest of the Smack xattrs are only on sockets. | |
1353 | */ | |
1354 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
1355 | return -EOPNOTSUPP; | |
1356 | ||
1357 | sock = SOCKET_I(inode); | |
2e1d146a | 1358 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
1359 | return -EOPNOTSUPP; |
1360 | ||
1361 | ssp = sock->sk->sk_security; | |
1362 | ||
1363 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
1364 | ssp->smk_in = sp; | |
1365 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { | |
1366 | ssp->smk_out = sp; | |
4bc87e62 CS |
1367 | rc = smack_netlabel(sock->sk); |
1368 | if (rc != 0) | |
1369 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
1370 | __func__, -rc); | |
e114e473 CS |
1371 | } else |
1372 | return -EOPNOTSUPP; | |
1373 | ||
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | /** | |
1378 | * smack_socket_post_create - finish socket setup | |
1379 | * @sock: the socket | |
1380 | * @family: protocol family | |
1381 | * @type: unused | |
1382 | * @protocol: unused | |
1383 | * @kern: unused | |
1384 | * | |
1385 | * Sets the netlabel information on the socket | |
1386 | * | |
1387 | * Returns 0 on success, and error code otherwise | |
1388 | */ | |
1389 | static int smack_socket_post_create(struct socket *sock, int family, | |
1390 | int type, int protocol, int kern) | |
1391 | { | |
2e1d146a | 1392 | if (family != PF_INET || sock->sk == NULL) |
e114e473 CS |
1393 | return 0; |
1394 | /* | |
1395 | * Set the outbound netlbl. | |
1396 | */ | |
1397 | return smack_netlabel(sock->sk); | |
1398 | } | |
1399 | ||
1400 | /** | |
1401 | * smack_flags_to_may - convert S_ to MAY_ values | |
1402 | * @flags: the S_ value | |
1403 | * | |
1404 | * Returns the equivalent MAY_ value | |
1405 | */ | |
1406 | static int smack_flags_to_may(int flags) | |
1407 | { | |
1408 | int may = 0; | |
1409 | ||
1410 | if (flags & S_IRUGO) | |
1411 | may |= MAY_READ; | |
1412 | if (flags & S_IWUGO) | |
1413 | may |= MAY_WRITE; | |
1414 | if (flags & S_IXUGO) | |
1415 | may |= MAY_EXEC; | |
1416 | ||
1417 | return may; | |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
1422 | * @msg: the object | |
1423 | * | |
1424 | * Returns 0 | |
1425 | */ | |
1426 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
1427 | { | |
1428 | msg->security = current->security; | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | /** | |
1433 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
1434 | * @msg: the object | |
1435 | * | |
1436 | * Clears the blob pointer | |
1437 | */ | |
1438 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
1439 | { | |
1440 | msg->security = NULL; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * smack_of_shm - the smack pointer for the shm | |
1445 | * @shp: the object | |
1446 | * | |
1447 | * Returns a pointer to the smack value | |
1448 | */ | |
1449 | static char *smack_of_shm(struct shmid_kernel *shp) | |
1450 | { | |
1451 | return (char *)shp->shm_perm.security; | |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * smack_shm_alloc_security - Set the security blob for shm | |
1456 | * @shp: the object | |
1457 | * | |
1458 | * Returns 0 | |
1459 | */ | |
1460 | static int smack_shm_alloc_security(struct shmid_kernel *shp) | |
1461 | { | |
1462 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1463 | ||
1464 | isp->security = current->security; | |
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | /** | |
1469 | * smack_shm_free_security - Clear the security blob for shm | |
1470 | * @shp: the object | |
1471 | * | |
1472 | * Clears the blob pointer | |
1473 | */ | |
1474 | static void smack_shm_free_security(struct shmid_kernel *shp) | |
1475 | { | |
1476 | struct kern_ipc_perm *isp = &shp->shm_perm; | |
1477 | ||
1478 | isp->security = NULL; | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * smack_shm_associate - Smack access check for shm | |
1483 | * @shp: the object | |
1484 | * @shmflg: access requested | |
1485 | * | |
1486 | * Returns 0 if current has the requested access, error code otherwise | |
1487 | */ | |
1488 | static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) | |
1489 | { | |
1490 | char *ssp = smack_of_shm(shp); | |
1491 | int may; | |
1492 | ||
1493 | may = smack_flags_to_may(shmflg); | |
1494 | return smk_curacc(ssp, may); | |
1495 | } | |
1496 | ||
1497 | /** | |
1498 | * smack_shm_shmctl - Smack access check for shm | |
1499 | * @shp: the object | |
1500 | * @cmd: what it wants to do | |
1501 | * | |
1502 | * Returns 0 if current has the requested access, error code otherwise | |
1503 | */ | |
1504 | static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
1505 | { | |
1d252fb8 | 1506 | char *ssp; |
e114e473 CS |
1507 | int may; |
1508 | ||
1509 | switch (cmd) { | |
1510 | case IPC_STAT: | |
1511 | case SHM_STAT: | |
1512 | may = MAY_READ; | |
1513 | break; | |
1514 | case IPC_SET: | |
1515 | case SHM_LOCK: | |
1516 | case SHM_UNLOCK: | |
1517 | case IPC_RMID: | |
1518 | may = MAY_READWRITE; | |
1519 | break; | |
1520 | case IPC_INFO: | |
1521 | case SHM_INFO: | |
1522 | /* | |
1523 | * System level information. | |
1524 | */ | |
1525 | return 0; | |
1526 | default: | |
1527 | return -EINVAL; | |
1528 | } | |
1529 | ||
1d252fb8 | 1530 | ssp = smack_of_shm(shp); |
e114e473 CS |
1531 | return smk_curacc(ssp, may); |
1532 | } | |
1533 | ||
1534 | /** | |
1535 | * smack_shm_shmat - Smack access for shmat | |
1536 | * @shp: the object | |
1537 | * @shmaddr: unused | |
1538 | * @shmflg: access requested | |
1539 | * | |
1540 | * Returns 0 if current has the requested access, error code otherwise | |
1541 | */ | |
1542 | static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, | |
1543 | int shmflg) | |
1544 | { | |
1545 | char *ssp = smack_of_shm(shp); | |
1546 | int may; | |
1547 | ||
1548 | may = smack_flags_to_may(shmflg); | |
1549 | return smk_curacc(ssp, may); | |
1550 | } | |
1551 | ||
1552 | /** | |
1553 | * smack_of_sem - the smack pointer for the sem | |
1554 | * @sma: the object | |
1555 | * | |
1556 | * Returns a pointer to the smack value | |
1557 | */ | |
1558 | static char *smack_of_sem(struct sem_array *sma) | |
1559 | { | |
1560 | return (char *)sma->sem_perm.security; | |
1561 | } | |
1562 | ||
1563 | /** | |
1564 | * smack_sem_alloc_security - Set the security blob for sem | |
1565 | * @sma: the object | |
1566 | * | |
1567 | * Returns 0 | |
1568 | */ | |
1569 | static int smack_sem_alloc_security(struct sem_array *sma) | |
1570 | { | |
1571 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1572 | ||
1573 | isp->security = current->security; | |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | /** | |
1578 | * smack_sem_free_security - Clear the security blob for sem | |
1579 | * @sma: the object | |
1580 | * | |
1581 | * Clears the blob pointer | |
1582 | */ | |
1583 | static void smack_sem_free_security(struct sem_array *sma) | |
1584 | { | |
1585 | struct kern_ipc_perm *isp = &sma->sem_perm; | |
1586 | ||
1587 | isp->security = NULL; | |
1588 | } | |
1589 | ||
1590 | /** | |
1591 | * smack_sem_associate - Smack access check for sem | |
1592 | * @sma: the object | |
1593 | * @semflg: access requested | |
1594 | * | |
1595 | * Returns 0 if current has the requested access, error code otherwise | |
1596 | */ | |
1597 | static int smack_sem_associate(struct sem_array *sma, int semflg) | |
1598 | { | |
1599 | char *ssp = smack_of_sem(sma); | |
1600 | int may; | |
1601 | ||
1602 | may = smack_flags_to_may(semflg); | |
1603 | return smk_curacc(ssp, may); | |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * smack_sem_shmctl - Smack access check for sem | |
1608 | * @sma: the object | |
1609 | * @cmd: what it wants to do | |
1610 | * | |
1611 | * Returns 0 if current has the requested access, error code otherwise | |
1612 | */ | |
1613 | static int smack_sem_semctl(struct sem_array *sma, int cmd) | |
1614 | { | |
1d252fb8 | 1615 | char *ssp; |
e114e473 CS |
1616 | int may; |
1617 | ||
1618 | switch (cmd) { | |
1619 | case GETPID: | |
1620 | case GETNCNT: | |
1621 | case GETZCNT: | |
1622 | case GETVAL: | |
1623 | case GETALL: | |
1624 | case IPC_STAT: | |
1625 | case SEM_STAT: | |
1626 | may = MAY_READ; | |
1627 | break; | |
1628 | case SETVAL: | |
1629 | case SETALL: | |
1630 | case IPC_RMID: | |
1631 | case IPC_SET: | |
1632 | may = MAY_READWRITE; | |
1633 | break; | |
1634 | case IPC_INFO: | |
1635 | case SEM_INFO: | |
1636 | /* | |
1637 | * System level information | |
1638 | */ | |
1639 | return 0; | |
1640 | default: | |
1641 | return -EINVAL; | |
1642 | } | |
1643 | ||
1d252fb8 | 1644 | ssp = smack_of_sem(sma); |
e114e473 CS |
1645 | return smk_curacc(ssp, may); |
1646 | } | |
1647 | ||
1648 | /** | |
1649 | * smack_sem_semop - Smack checks of semaphore operations | |
1650 | * @sma: the object | |
1651 | * @sops: unused | |
1652 | * @nsops: unused | |
1653 | * @alter: unused | |
1654 | * | |
1655 | * Treated as read and write in all cases. | |
1656 | * | |
1657 | * Returns 0 if access is allowed, error code otherwise | |
1658 | */ | |
1659 | static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, | |
1660 | unsigned nsops, int alter) | |
1661 | { | |
1662 | char *ssp = smack_of_sem(sma); | |
1663 | ||
1664 | return smk_curacc(ssp, MAY_READWRITE); | |
1665 | } | |
1666 | ||
1667 | /** | |
1668 | * smack_msg_alloc_security - Set the security blob for msg | |
1669 | * @msq: the object | |
1670 | * | |
1671 | * Returns 0 | |
1672 | */ | |
1673 | static int smack_msg_queue_alloc_security(struct msg_queue *msq) | |
1674 | { | |
1675 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1676 | ||
1677 | kisp->security = current->security; | |
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | /** | |
1682 | * smack_msg_free_security - Clear the security blob for msg | |
1683 | * @msq: the object | |
1684 | * | |
1685 | * Clears the blob pointer | |
1686 | */ | |
1687 | static void smack_msg_queue_free_security(struct msg_queue *msq) | |
1688 | { | |
1689 | struct kern_ipc_perm *kisp = &msq->q_perm; | |
1690 | ||
1691 | kisp->security = NULL; | |
1692 | } | |
1693 | ||
1694 | /** | |
1695 | * smack_of_msq - the smack pointer for the msq | |
1696 | * @msq: the object | |
1697 | * | |
1698 | * Returns a pointer to the smack value | |
1699 | */ | |
1700 | static char *smack_of_msq(struct msg_queue *msq) | |
1701 | { | |
1702 | return (char *)msq->q_perm.security; | |
1703 | } | |
1704 | ||
1705 | /** | |
1706 | * smack_msg_queue_associate - Smack access check for msg_queue | |
1707 | * @msq: the object | |
1708 | * @msqflg: access requested | |
1709 | * | |
1710 | * Returns 0 if current has the requested access, error code otherwise | |
1711 | */ | |
1712 | static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
1713 | { | |
1714 | char *msp = smack_of_msq(msq); | |
1715 | int may; | |
1716 | ||
1717 | may = smack_flags_to_may(msqflg); | |
1718 | return smk_curacc(msp, may); | |
1719 | } | |
1720 | ||
1721 | /** | |
1722 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
1723 | * @msq: the object | |
1724 | * @cmd: what it wants to do | |
1725 | * | |
1726 | * Returns 0 if current has the requested access, error code otherwise | |
1727 | */ | |
1728 | static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
1729 | { | |
1d252fb8 | 1730 | char *msp; |
e114e473 CS |
1731 | int may; |
1732 | ||
1733 | switch (cmd) { | |
1734 | case IPC_STAT: | |
1735 | case MSG_STAT: | |
1736 | may = MAY_READ; | |
1737 | break; | |
1738 | case IPC_SET: | |
1739 | case IPC_RMID: | |
1740 | may = MAY_READWRITE; | |
1741 | break; | |
1742 | case IPC_INFO: | |
1743 | case MSG_INFO: | |
1744 | /* | |
1745 | * System level information | |
1746 | */ | |
1747 | return 0; | |
1748 | default: | |
1749 | return -EINVAL; | |
1750 | } | |
1751 | ||
1d252fb8 | 1752 | msp = smack_of_msq(msq); |
e114e473 CS |
1753 | return smk_curacc(msp, may); |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1758 | * @msq: the object | |
1759 | * @msg: unused | |
1760 | * @msqflg: access requested | |
1761 | * | |
1762 | * Returns 0 if current has the requested access, error code otherwise | |
1763 | */ | |
1764 | static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, | |
1765 | int msqflg) | |
1766 | { | |
1767 | char *msp = smack_of_msq(msq); | |
1768 | int rc; | |
1769 | ||
1770 | rc = smack_flags_to_may(msqflg); | |
1771 | return smk_curacc(msp, rc); | |
1772 | } | |
1773 | ||
1774 | /** | |
1775 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
1776 | * @msq: the object | |
1777 | * @msg: unused | |
1778 | * @target: unused | |
1779 | * @type: unused | |
1780 | * @mode: unused | |
1781 | * | |
1782 | * Returns 0 if current has read and write access, error code otherwise | |
1783 | */ | |
1784 | static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
1785 | struct task_struct *target, long type, int mode) | |
1786 | { | |
1787 | char *msp = smack_of_msq(msq); | |
1788 | ||
1789 | return smk_curacc(msp, MAY_READWRITE); | |
1790 | } | |
1791 | ||
1792 | /** | |
1793 | * smack_ipc_permission - Smack access for ipc_permission() | |
1794 | * @ipp: the object permissions | |
1795 | * @flag: access requested | |
1796 | * | |
1797 | * Returns 0 if current has read and write access, error code otherwise | |
1798 | */ | |
1799 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
1800 | { | |
1801 | char *isp = ipp->security; | |
1802 | int may; | |
1803 | ||
1804 | may = smack_flags_to_may(flag); | |
1805 | return smk_curacc(isp, may); | |
1806 | } | |
1807 | ||
bcdca225 CS |
1808 | /* module stacking operations */ |
1809 | ||
1810 | /** | |
1811 | * smack_register_security - stack capability module | |
1812 | * @name: module name | |
1813 | * @ops: module operations - ignored | |
1814 | * | |
1815 | * Allow the capability module to register. | |
1816 | */ | |
1817 | static int smack_register_security(const char *name, | |
1818 | struct security_operations *ops) | |
1819 | { | |
1820 | if (strcmp(name, "capability") != 0) | |
1821 | return -EINVAL; | |
1822 | ||
1823 | printk(KERN_INFO "%s: Registering secondary module %s\n", | |
1824 | __func__, name); | |
1825 | ||
1826 | return 0; | |
1827 | } | |
1828 | ||
e114e473 CS |
1829 | /** |
1830 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
1831 | * @opt_dentry: unused | |
1832 | * @inode: the object | |
1833 | * | |
1834 | * Set the inode's security blob if it hasn't been done already. | |
1835 | */ | |
1836 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
1837 | { | |
1838 | struct super_block *sbp; | |
1839 | struct superblock_smack *sbsp; | |
1840 | struct inode_smack *isp; | |
1841 | char *csp = current->security; | |
1842 | char *fetched; | |
1843 | char *final; | |
1844 | struct dentry *dp; | |
1845 | ||
1846 | if (inode == NULL) | |
1847 | return; | |
1848 | ||
1849 | isp = inode->i_security; | |
1850 | ||
1851 | mutex_lock(&isp->smk_lock); | |
1852 | /* | |
1853 | * If the inode is already instantiated | |
1854 | * take the quick way out | |
1855 | */ | |
1856 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
1857 | goto unlockandout; | |
1858 | ||
1859 | sbp = inode->i_sb; | |
1860 | sbsp = sbp->s_security; | |
1861 | /* | |
1862 | * We're going to use the superblock default label | |
1863 | * if there's no label on the file. | |
1864 | */ | |
1865 | final = sbsp->smk_default; | |
1866 | ||
1867 | /* | |
1868 | * This is pretty hackish. | |
1869 | * Casey says that we shouldn't have to do | |
1870 | * file system specific code, but it does help | |
1871 | * with keeping it simple. | |
1872 | */ | |
1873 | switch (sbp->s_magic) { | |
1874 | case SMACK_MAGIC: | |
1875 | /* | |
1876 | * Casey says that it's a little embarassing | |
1877 | * that the smack file system doesn't do | |
1878 | * extended attributes. | |
1879 | */ | |
1880 | final = smack_known_star.smk_known; | |
1881 | break; | |
1882 | case PIPEFS_MAGIC: | |
1883 | /* | |
1884 | * Casey says pipes are easy (?) | |
1885 | */ | |
1886 | final = smack_known_star.smk_known; | |
1887 | break; | |
1888 | case DEVPTS_SUPER_MAGIC: | |
1889 | /* | |
1890 | * devpts seems content with the label of the task. | |
1891 | * Programs that change smack have to treat the | |
1892 | * pty with respect. | |
1893 | */ | |
1894 | final = csp; | |
1895 | break; | |
1896 | case SOCKFS_MAGIC: | |
1897 | /* | |
1898 | * Casey says sockets get the smack of the task. | |
1899 | */ | |
1900 | final = csp; | |
1901 | break; | |
1902 | case PROC_SUPER_MAGIC: | |
1903 | /* | |
1904 | * Casey says procfs appears not to care. | |
1905 | * The superblock default suffices. | |
1906 | */ | |
1907 | break; | |
1908 | case TMPFS_MAGIC: | |
1909 | /* | |
1910 | * Device labels should come from the filesystem, | |
1911 | * but watch out, because they're volitile, | |
1912 | * getting recreated on every reboot. | |
1913 | */ | |
1914 | final = smack_known_star.smk_known; | |
1915 | /* | |
1916 | * No break. | |
1917 | * | |
1918 | * If a smack value has been set we want to use it, | |
1919 | * but since tmpfs isn't giving us the opportunity | |
1920 | * to set mount options simulate setting the | |
1921 | * superblock default. | |
1922 | */ | |
1923 | default: | |
1924 | /* | |
1925 | * This isn't an understood special case. | |
1926 | * Get the value from the xattr. | |
1927 | * | |
1928 | * No xattr support means, alas, no SMACK label. | |
1929 | * Use the aforeapplied default. | |
1930 | * It would be curious if the label of the task | |
1931 | * does not match that assigned. | |
1932 | */ | |
1933 | if (inode->i_op->getxattr == NULL) | |
1934 | break; | |
1935 | /* | |
1936 | * Get the dentry for xattr. | |
1937 | */ | |
1938 | if (opt_dentry == NULL) { | |
1939 | dp = d_find_alias(inode); | |
1940 | if (dp == NULL) | |
1941 | break; | |
1942 | } else { | |
1943 | dp = dget(opt_dentry); | |
1944 | if (dp == NULL) | |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | fetched = smk_fetch(inode, dp); | |
1949 | if (fetched != NULL) | |
1950 | final = fetched; | |
1951 | ||
1952 | dput(dp); | |
1953 | break; | |
1954 | } | |
1955 | ||
1956 | if (final == NULL) | |
1957 | isp->smk_inode = csp; | |
1958 | else | |
1959 | isp->smk_inode = final; | |
1960 | ||
1961 | isp->smk_flags |= SMK_INODE_INSTANT; | |
1962 | ||
1963 | unlockandout: | |
1964 | mutex_unlock(&isp->smk_lock); | |
1965 | return; | |
1966 | } | |
1967 | ||
1968 | /** | |
1969 | * smack_getprocattr - Smack process attribute access | |
1970 | * @p: the object task | |
1971 | * @name: the name of the attribute in /proc/.../attr | |
1972 | * @value: where to put the result | |
1973 | * | |
1974 | * Places a copy of the task Smack into value | |
1975 | * | |
1976 | * Returns the length of the smack label or an error code | |
1977 | */ | |
1978 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
1979 | { | |
1980 | char *cp; | |
1981 | int slen; | |
1982 | ||
1983 | if (strcmp(name, "current") != 0) | |
1984 | return -EINVAL; | |
1985 | ||
1986 | cp = kstrdup(p->security, GFP_KERNEL); | |
1987 | if (cp == NULL) | |
1988 | return -ENOMEM; | |
1989 | ||
1990 | slen = strlen(cp); | |
1991 | *value = cp; | |
1992 | return slen; | |
1993 | } | |
1994 | ||
1995 | /** | |
1996 | * smack_setprocattr - Smack process attribute setting | |
1997 | * @p: the object task | |
1998 | * @name: the name of the attribute in /proc/.../attr | |
1999 | * @value: the value to set | |
2000 | * @size: the size of the value | |
2001 | * | |
2002 | * Sets the Smack value of the task. Only setting self | |
2003 | * is permitted and only with privilege | |
2004 | * | |
2005 | * Returns the length of the smack label or an error code | |
2006 | */ | |
2007 | static int smack_setprocattr(struct task_struct *p, char *name, | |
2008 | void *value, size_t size) | |
2009 | { | |
2010 | char *newsmack; | |
2011 | ||
2012 | if (!__capable(p, CAP_MAC_ADMIN)) | |
2013 | return -EPERM; | |
2014 | ||
2015 | /* | |
2016 | * Changing another process' Smack value is too dangerous | |
2017 | * and supports no sane use case. | |
2018 | */ | |
2019 | if (p != current) | |
2020 | return -EPERM; | |
2021 | ||
2022 | if (value == NULL || size == 0 || size >= SMK_LABELLEN) | |
2023 | return -EINVAL; | |
2024 | ||
2025 | if (strcmp(name, "current") != 0) | |
2026 | return -EINVAL; | |
2027 | ||
2028 | newsmack = smk_import(value, size); | |
2029 | if (newsmack == NULL) | |
2030 | return -EINVAL; | |
2031 | ||
2032 | p->security = newsmack; | |
2033 | return size; | |
2034 | } | |
2035 | ||
2036 | /** | |
2037 | * smack_unix_stream_connect - Smack access on UDS | |
2038 | * @sock: one socket | |
2039 | * @other: the other socket | |
2040 | * @newsk: unused | |
2041 | * | |
2042 | * Return 0 if a subject with the smack of sock could access | |
2043 | * an object with the smack of other, otherwise an error code | |
2044 | */ | |
2045 | static int smack_unix_stream_connect(struct socket *sock, | |
2046 | struct socket *other, struct sock *newsk) | |
2047 | { | |
2048 | struct inode *sp = SOCK_INODE(sock); | |
2049 | struct inode *op = SOCK_INODE(other); | |
2050 | ||
2051 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE); | |
2052 | } | |
2053 | ||
2054 | /** | |
2055 | * smack_unix_may_send - Smack access on UDS | |
2056 | * @sock: one socket | |
2057 | * @other: the other socket | |
2058 | * | |
2059 | * Return 0 if a subject with the smack of sock could access | |
2060 | * an object with the smack of other, otherwise an error code | |
2061 | */ | |
2062 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
2063 | { | |
2064 | struct inode *sp = SOCK_INODE(sock); | |
2065 | struct inode *op = SOCK_INODE(other); | |
2066 | ||
2067 | return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE); | |
2068 | } | |
2069 | ||
2070 | /** | |
2071 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat | |
2072 | * pair to smack | |
2073 | * @sap: netlabel secattr | |
2074 | * @sip: where to put the result | |
2075 | * | |
2076 | * Copies a smack label into sip | |
2077 | */ | |
2078 | static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) | |
2079 | { | |
2080 | char smack[SMK_LABELLEN]; | |
2081 | int pcat; | |
2082 | ||
2083 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) { | |
2084 | /* | |
2085 | * If there are flags but no level netlabel isn't | |
2086 | * behaving the way we expect it to. | |
2087 | * | |
2088 | * Without guidance regarding the smack value | |
2089 | * for the packet fall back on the network | |
2090 | * ambient value. | |
2091 | */ | |
2092 | strncpy(sip, smack_net_ambient, SMK_MAXLEN); | |
2093 | return; | |
2094 | } | |
2095 | /* | |
2096 | * Get the categories, if any | |
2097 | */ | |
2098 | memset(smack, '\0', SMK_LABELLEN); | |
2099 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) | |
2100 | for (pcat = -1;;) { | |
2101 | pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat, | |
2102 | pcat + 1); | |
2103 | if (pcat < 0) | |
2104 | break; | |
2105 | smack_catset_bit(pcat, smack); | |
2106 | } | |
2107 | /* | |
2108 | * If it is CIPSO using smack direct mapping | |
2109 | * we are already done. WeeHee. | |
2110 | */ | |
2111 | if (sap->attr.mls.lvl == smack_cipso_direct) { | |
2112 | memcpy(sip, smack, SMK_MAXLEN); | |
2113 | return; | |
2114 | } | |
2115 | /* | |
2116 | * Look it up in the supplied table if it is not a direct mapping. | |
2117 | */ | |
2118 | smack_from_cipso(sap->attr.mls.lvl, smack, sip); | |
2119 | return; | |
2120 | } | |
2121 | ||
2122 | /** | |
2123 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
2124 | * @sk: socket | |
2125 | * @skb: packet | |
2126 | * | |
2127 | * Returns 0 if the packet should be delivered, an error code otherwise | |
2128 | */ | |
2129 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
2130 | { | |
2131 | struct netlbl_lsm_secattr secattr; | |
2132 | struct socket_smack *ssp = sk->sk_security; | |
2133 | char smack[SMK_LABELLEN]; | |
2134 | int rc; | |
2135 | ||
2136 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2137 | return 0; | |
2138 | ||
2139 | /* | |
2140 | * Translate what netlabel gave us. | |
2141 | */ | |
2142 | memset(smack, '\0', SMK_LABELLEN); | |
2143 | netlbl_secattr_init(&secattr); | |
2144 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); | |
2145 | if (rc == 0) | |
2146 | smack_from_secattr(&secattr, smack); | |
2147 | else | |
2148 | strncpy(smack, smack_net_ambient, SMK_MAXLEN); | |
2149 | netlbl_secattr_destroy(&secattr); | |
2150 | /* | |
2151 | * Receiving a packet requires that the other end | |
2152 | * be able to write here. Read access is not required. | |
2153 | * This is the simplist possible security model | |
2154 | * for networking. | |
2155 | */ | |
2156 | return smk_access(smack, ssp->smk_in, MAY_WRITE); | |
2157 | } | |
2158 | ||
2159 | /** | |
2160 | * smack_socket_getpeersec_stream - pull in packet label | |
2161 | * @sock: the socket | |
2162 | * @optval: user's destination | |
2163 | * @optlen: size thereof | |
2164 | * @len: max thereoe | |
2165 | * | |
2166 | * returns zero on success, an error code otherwise | |
2167 | */ | |
2168 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
2169 | char __user *optval, | |
2170 | int __user *optlen, unsigned len) | |
2171 | { | |
2172 | struct socket_smack *ssp; | |
2173 | int slen; | |
2174 | int rc = 0; | |
2175 | ||
2176 | ssp = sock->sk->sk_security; | |
2177 | slen = strlen(ssp->smk_packet) + 1; | |
2178 | ||
2179 | if (slen > len) | |
2180 | rc = -ERANGE; | |
2181 | else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) | |
2182 | rc = -EFAULT; | |
2183 | ||
2184 | if (put_user(slen, optlen) != 0) | |
2185 | rc = -EFAULT; | |
2186 | ||
2187 | return rc; | |
2188 | } | |
2189 | ||
2190 | ||
2191 | /** | |
2192 | * smack_socket_getpeersec_dgram - pull in packet label | |
2193 | * @sock: the socket | |
2194 | * @skb: packet data | |
2195 | * @secid: pointer to where to put the secid of the packet | |
2196 | * | |
2197 | * Sets the netlabel socket state on sk from parent | |
2198 | */ | |
2199 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
2200 | struct sk_buff *skb, u32 *secid) | |
2201 | ||
2202 | { | |
2203 | struct netlbl_lsm_secattr secattr; | |
2204 | struct sock *sk; | |
2205 | char smack[SMK_LABELLEN]; | |
2206 | int family = PF_INET; | |
2207 | u32 s; | |
2208 | int rc; | |
2209 | ||
2210 | /* | |
2211 | * Only works for families with packets. | |
2212 | */ | |
2213 | if (sock != NULL) { | |
2214 | sk = sock->sk; | |
2215 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2216 | return 0; | |
2217 | family = sk->sk_family; | |
2218 | } | |
2219 | /* | |
2220 | * Translate what netlabel gave us. | |
2221 | */ | |
2222 | memset(smack, '\0', SMK_LABELLEN); | |
2223 | netlbl_secattr_init(&secattr); | |
2224 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
2225 | if (rc == 0) | |
2226 | smack_from_secattr(&secattr, smack); | |
2227 | netlbl_secattr_destroy(&secattr); | |
2228 | ||
2229 | /* | |
2230 | * Give up if we couldn't get anything | |
2231 | */ | |
2232 | if (rc != 0) | |
2233 | return rc; | |
2234 | ||
2235 | s = smack_to_secid(smack); | |
2236 | if (s == 0) | |
2237 | return -EINVAL; | |
2238 | ||
2239 | *secid = s; | |
2240 | return 0; | |
2241 | } | |
2242 | ||
2243 | /** | |
2244 | * smack_sock_graft - graft access state between two sockets | |
2245 | * @sk: fresh sock | |
2246 | * @parent: donor socket | |
2247 | * | |
2248 | * Sets the netlabel socket state on sk from parent | |
2249 | */ | |
2250 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
2251 | { | |
2252 | struct socket_smack *ssp; | |
2253 | int rc; | |
2254 | ||
2255 | if (sk == NULL) | |
2256 | return; | |
2257 | ||
2258 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
2259 | return; | |
2260 | ||
2261 | ssp = sk->sk_security; | |
2262 | ssp->smk_in = current->security; | |
2263 | ssp->smk_out = current->security; | |
2264 | ssp->smk_packet[0] = '\0'; | |
2265 | ||
2266 | rc = smack_netlabel(sk); | |
4bc87e62 CS |
2267 | if (rc != 0) |
2268 | printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", | |
2269 | __func__, -rc); | |
e114e473 CS |
2270 | } |
2271 | ||
2272 | /** | |
2273 | * smack_inet_conn_request - Smack access check on connect | |
2274 | * @sk: socket involved | |
2275 | * @skb: packet | |
2276 | * @req: unused | |
2277 | * | |
2278 | * Returns 0 if a task with the packet label could write to | |
2279 | * the socket, otherwise an error code | |
2280 | */ | |
2281 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
2282 | struct request_sock *req) | |
2283 | { | |
2284 | struct netlbl_lsm_secattr skb_secattr; | |
2285 | struct socket_smack *ssp = sk->sk_security; | |
2286 | char smack[SMK_LABELLEN]; | |
2287 | int rc; | |
2288 | ||
2289 | if (skb == NULL) | |
2290 | return -EACCES; | |
2291 | ||
2292 | memset(smack, '\0', SMK_LABELLEN); | |
2293 | netlbl_secattr_init(&skb_secattr); | |
2294 | rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr); | |
2295 | if (rc == 0) | |
2296 | smack_from_secattr(&skb_secattr, smack); | |
2297 | else | |
2298 | strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); | |
2299 | netlbl_secattr_destroy(&skb_secattr); | |
2300 | /* | |
2301 | * Receiving a packet requires that the other end | |
2302 | * be able to write here. Read access is not required. | |
2303 | * | |
2304 | * If the request is successful save the peer's label | |
2305 | * so that SO_PEERCRED can report it. | |
2306 | */ | |
2307 | rc = smk_access(smack, ssp->smk_in, MAY_WRITE); | |
2308 | if (rc == 0) | |
2309 | strncpy(ssp->smk_packet, smack, SMK_MAXLEN); | |
2310 | ||
2311 | return rc; | |
2312 | } | |
2313 | ||
2314 | /* | |
2315 | * Key management security hooks | |
2316 | * | |
2317 | * Casey has not tested key support very heavily. | |
2318 | * The permission check is most likely too restrictive. | |
2319 | * If you care about keys please have a look. | |
2320 | */ | |
2321 | #ifdef CONFIG_KEYS | |
2322 | ||
2323 | /** | |
2324 | * smack_key_alloc - Set the key security blob | |
2325 | * @key: object | |
2326 | * @tsk: the task associated with the key | |
2327 | * @flags: unused | |
2328 | * | |
2329 | * No allocation required | |
2330 | * | |
2331 | * Returns 0 | |
2332 | */ | |
2333 | static int smack_key_alloc(struct key *key, struct task_struct *tsk, | |
2334 | unsigned long flags) | |
2335 | { | |
2336 | key->security = tsk->security; | |
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | /** | |
2341 | * smack_key_free - Clear the key security blob | |
2342 | * @key: the object | |
2343 | * | |
2344 | * Clear the blob pointer | |
2345 | */ | |
2346 | static void smack_key_free(struct key *key) | |
2347 | { | |
2348 | key->security = NULL; | |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * smack_key_permission - Smack access on a key | |
2353 | * @key_ref: gets to the object | |
2354 | * @context: task involved | |
2355 | * @perm: unused | |
2356 | * | |
2357 | * Return 0 if the task has read and write to the object, | |
2358 | * an error code otherwise | |
2359 | */ | |
2360 | static int smack_key_permission(key_ref_t key_ref, | |
2361 | struct task_struct *context, key_perm_t perm) | |
2362 | { | |
2363 | struct key *keyp; | |
2364 | ||
2365 | keyp = key_ref_to_ptr(key_ref); | |
2366 | if (keyp == NULL) | |
2367 | return -EINVAL; | |
2368 | /* | |
2369 | * If the key hasn't been initialized give it access so that | |
2370 | * it may do so. | |
2371 | */ | |
2372 | if (keyp->security == NULL) | |
2373 | return 0; | |
2374 | /* | |
2375 | * This should not occur | |
2376 | */ | |
2377 | if (context->security == NULL) | |
2378 | return -EACCES; | |
2379 | ||
2380 | return smk_access(context->security, keyp->security, MAY_READWRITE); | |
2381 | } | |
2382 | #endif /* CONFIG_KEYS */ | |
2383 | ||
2384 | /* | |
2385 | * smack_secid_to_secctx - return the smack label for a secid | |
2386 | * @secid: incoming integer | |
2387 | * @secdata: destination | |
2388 | * @seclen: how long it is | |
2389 | * | |
2390 | * Exists for networking code. | |
2391 | */ | |
2392 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
2393 | { | |
2394 | char *sp = smack_from_secid(secid); | |
2395 | ||
2396 | *secdata = sp; | |
2397 | *seclen = strlen(sp); | |
2398 | return 0; | |
2399 | } | |
2400 | ||
4bc87e62 CS |
2401 | /* |
2402 | * smack_secctx_to_secid - return the secid for a smack label | |
2403 | * @secdata: smack label | |
2404 | * @seclen: how long result is | |
2405 | * @secid: outgoing integer | |
2406 | * | |
2407 | * Exists for audit and networking code. | |
2408 | */ | |
2409 | static int smack_secctx_to_secid(char *secdata, u32 seclen, u32 *secid) | |
2410 | { | |
2411 | *secid = smack_to_secid(secdata); | |
2412 | return 0; | |
2413 | } | |
2414 | ||
e114e473 CS |
2415 | /* |
2416 | * smack_release_secctx - don't do anything. | |
2417 | * @key_ref: unused | |
2418 | * @context: unused | |
2419 | * @perm: unused | |
2420 | * | |
2421 | * Exists to make sure nothing gets done, and properly | |
2422 | */ | |
2423 | static void smack_release_secctx(char *secdata, u32 seclen) | |
2424 | { | |
2425 | } | |
2426 | ||
2427 | static struct security_operations smack_ops = { | |
2428 | .ptrace = smack_ptrace, | |
2429 | .capget = cap_capget, | |
2430 | .capset_check = cap_capset_check, | |
2431 | .capset_set = cap_capset_set, | |
2432 | .capable = cap_capable, | |
2433 | .syslog = smack_syslog, | |
2434 | .settime = cap_settime, | |
2435 | .vm_enough_memory = cap_vm_enough_memory, | |
2436 | ||
2437 | .bprm_apply_creds = cap_bprm_apply_creds, | |
2438 | .bprm_set_security = cap_bprm_set_security, | |
2439 | .bprm_secureexec = cap_bprm_secureexec, | |
2440 | ||
2441 | .sb_alloc_security = smack_sb_alloc_security, | |
2442 | .sb_free_security = smack_sb_free_security, | |
2443 | .sb_copy_data = smack_sb_copy_data, | |
2444 | .sb_kern_mount = smack_sb_kern_mount, | |
2445 | .sb_statfs = smack_sb_statfs, | |
2446 | .sb_mount = smack_sb_mount, | |
2447 | .sb_umount = smack_sb_umount, | |
2448 | ||
2449 | .inode_alloc_security = smack_inode_alloc_security, | |
2450 | .inode_free_security = smack_inode_free_security, | |
2451 | .inode_init_security = smack_inode_init_security, | |
2452 | .inode_link = smack_inode_link, | |
2453 | .inode_unlink = smack_inode_unlink, | |
2454 | .inode_rmdir = smack_inode_rmdir, | |
2455 | .inode_rename = smack_inode_rename, | |
2456 | .inode_permission = smack_inode_permission, | |
2457 | .inode_setattr = smack_inode_setattr, | |
2458 | .inode_getattr = smack_inode_getattr, | |
2459 | .inode_setxattr = smack_inode_setxattr, | |
2460 | .inode_post_setxattr = smack_inode_post_setxattr, | |
2461 | .inode_getxattr = smack_inode_getxattr, | |
2462 | .inode_removexattr = smack_inode_removexattr, | |
bcdca225 CS |
2463 | .inode_need_killpriv = cap_inode_need_killpriv, |
2464 | .inode_killpriv = cap_inode_killpriv, | |
e114e473 CS |
2465 | .inode_getsecurity = smack_inode_getsecurity, |
2466 | .inode_setsecurity = smack_inode_setsecurity, | |
2467 | .inode_listsecurity = smack_inode_listsecurity, | |
2468 | ||
2469 | .file_permission = smack_file_permission, | |
2470 | .file_alloc_security = smack_file_alloc_security, | |
2471 | .file_free_security = smack_file_free_security, | |
2472 | .file_ioctl = smack_file_ioctl, | |
2473 | .file_lock = smack_file_lock, | |
2474 | .file_fcntl = smack_file_fcntl, | |
2475 | .file_set_fowner = smack_file_set_fowner, | |
2476 | .file_send_sigiotask = smack_file_send_sigiotask, | |
2477 | .file_receive = smack_file_receive, | |
2478 | ||
2479 | .task_alloc_security = smack_task_alloc_security, | |
2480 | .task_free_security = smack_task_free_security, | |
2481 | .task_post_setuid = cap_task_post_setuid, | |
2482 | .task_setpgid = smack_task_setpgid, | |
2483 | .task_getpgid = smack_task_getpgid, | |
2484 | .task_getsid = smack_task_getsid, | |
2485 | .task_getsecid = smack_task_getsecid, | |
2486 | .task_setnice = smack_task_setnice, | |
2487 | .task_setioprio = smack_task_setioprio, | |
2488 | .task_getioprio = smack_task_getioprio, | |
2489 | .task_setscheduler = smack_task_setscheduler, | |
2490 | .task_getscheduler = smack_task_getscheduler, | |
2491 | .task_movememory = smack_task_movememory, | |
2492 | .task_kill = smack_task_kill, | |
2493 | .task_wait = smack_task_wait, | |
2494 | .task_reparent_to_init = cap_task_reparent_to_init, | |
2495 | .task_to_inode = smack_task_to_inode, | |
2496 | ||
2497 | .ipc_permission = smack_ipc_permission, | |
2498 | ||
2499 | .msg_msg_alloc_security = smack_msg_msg_alloc_security, | |
2500 | .msg_msg_free_security = smack_msg_msg_free_security, | |
2501 | ||
2502 | .msg_queue_alloc_security = smack_msg_queue_alloc_security, | |
2503 | .msg_queue_free_security = smack_msg_queue_free_security, | |
2504 | .msg_queue_associate = smack_msg_queue_associate, | |
2505 | .msg_queue_msgctl = smack_msg_queue_msgctl, | |
2506 | .msg_queue_msgsnd = smack_msg_queue_msgsnd, | |
2507 | .msg_queue_msgrcv = smack_msg_queue_msgrcv, | |
2508 | ||
2509 | .shm_alloc_security = smack_shm_alloc_security, | |
2510 | .shm_free_security = smack_shm_free_security, | |
2511 | .shm_associate = smack_shm_associate, | |
2512 | .shm_shmctl = smack_shm_shmctl, | |
2513 | .shm_shmat = smack_shm_shmat, | |
2514 | ||
2515 | .sem_alloc_security = smack_sem_alloc_security, | |
2516 | .sem_free_security = smack_sem_free_security, | |
2517 | .sem_associate = smack_sem_associate, | |
2518 | .sem_semctl = smack_sem_semctl, | |
2519 | .sem_semop = smack_sem_semop, | |
2520 | ||
2521 | .netlink_send = cap_netlink_send, | |
2522 | .netlink_recv = cap_netlink_recv, | |
2523 | ||
bcdca225 CS |
2524 | .register_security = smack_register_security, |
2525 | ||
e114e473 CS |
2526 | .d_instantiate = smack_d_instantiate, |
2527 | ||
2528 | .getprocattr = smack_getprocattr, | |
2529 | .setprocattr = smack_setprocattr, | |
2530 | ||
2531 | .unix_stream_connect = smack_unix_stream_connect, | |
2532 | .unix_may_send = smack_unix_may_send, | |
2533 | ||
2534 | .socket_post_create = smack_socket_post_create, | |
2535 | .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, | |
2536 | .socket_getpeersec_stream = smack_socket_getpeersec_stream, | |
2537 | .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, | |
2538 | .sk_alloc_security = smack_sk_alloc_security, | |
2539 | .sk_free_security = smack_sk_free_security, | |
2540 | .sock_graft = smack_sock_graft, | |
2541 | .inet_conn_request = smack_inet_conn_request, | |
2542 | /* key management security hooks */ | |
2543 | #ifdef CONFIG_KEYS | |
2544 | .key_alloc = smack_key_alloc, | |
2545 | .key_free = smack_key_free, | |
2546 | .key_permission = smack_key_permission, | |
2547 | #endif /* CONFIG_KEYS */ | |
2548 | .secid_to_secctx = smack_secid_to_secctx, | |
4bc87e62 | 2549 | .secctx_to_secid = smack_secctx_to_secid, |
e114e473 CS |
2550 | .release_secctx = smack_release_secctx, |
2551 | }; | |
2552 | ||
2553 | /** | |
2554 | * smack_init - initialize the smack system | |
2555 | * | |
2556 | * Returns 0 | |
2557 | */ | |
2558 | static __init int smack_init(void) | |
2559 | { | |
2560 | printk(KERN_INFO "Smack: Initializing.\n"); | |
2561 | ||
2562 | /* | |
2563 | * Set the security state for the initial task. | |
2564 | */ | |
2565 | current->security = &smack_known_floor.smk_known; | |
2566 | ||
2567 | /* | |
2568 | * Initialize locks | |
2569 | */ | |
2570 | spin_lock_init(&smack_known_unset.smk_cipsolock); | |
2571 | spin_lock_init(&smack_known_huh.smk_cipsolock); | |
2572 | spin_lock_init(&smack_known_hat.smk_cipsolock); | |
2573 | spin_lock_init(&smack_known_star.smk_cipsolock); | |
2574 | spin_lock_init(&smack_known_floor.smk_cipsolock); | |
2575 | spin_lock_init(&smack_known_invalid.smk_cipsolock); | |
2576 | ||
2577 | /* | |
2578 | * Register with LSM | |
2579 | */ | |
2580 | if (register_security(&smack_ops)) | |
2581 | panic("smack: Unable to register with kernel.\n"); | |
2582 | ||
2583 | return 0; | |
2584 | } | |
2585 | ||
2586 | /* | |
2587 | * Smack requires early initialization in order to label | |
2588 | * all processes and objects when they are created. | |
2589 | */ | |
2590 | security_initcall(smack_init); | |
2591 |