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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 */
47static 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 */
68struct 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 */
97static 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 */
120static 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 */
149static 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 */
175static 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 */
192static int smack_sb_copy_data(struct file_system_type *type, void *orig,
193 void *smackopts)
194{
195 char *cp, *commap, *otheropts, *dp;
196
197 /* Binary mount data: just copy */
198 if (type->fs_flags & FS_BINARY_MOUNTDATA) {
199 copy_page(smackopts, orig);
200 return 0;
201 }
202
203 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
204 if (otheropts == NULL)
205 return -ENOMEM;
206
207 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
208 if (strstr(cp, SMK_FSDEFAULT) == cp)
209 dp = smackopts;
210 else if (strstr(cp, SMK_FSFLOOR) == cp)
211 dp = smackopts;
212 else if (strstr(cp, SMK_FSHAT) == cp)
213 dp = smackopts;
214 else if (strstr(cp, SMK_FSROOT) == cp)
215 dp = smackopts;
216 else
217 dp = otheropts;
218
219 commap = strchr(cp, ',');
220 if (commap != NULL)
221 *commap = '\0';
222
223 if (*dp != '\0')
224 strcat(dp, ",");
225 strcat(dp, cp);
226 }
227
228 strcpy(orig, otheropts);
229 free_page((unsigned long)otheropts);
230
231 return 0;
232}
233
234/**
235 * smack_sb_kern_mount - Smack specific mount processing
236 * @sb: the file system superblock
237 * @data: the smack mount options
238 *
239 * Returns 0 on success, an error code on failure
240 */
241static int smack_sb_kern_mount(struct super_block *sb, void *data)
242{
243 struct dentry *root = sb->s_root;
244 struct inode *inode = root->d_inode;
245 struct superblock_smack *sp = sb->s_security;
246 struct inode_smack *isp;
247 char *op;
248 char *commap;
249 char *nsp;
250
251 spin_lock(&sp->smk_sblock);
252 if (sp->smk_initialized != 0) {
253 spin_unlock(&sp->smk_sblock);
254 return 0;
255 }
256 sp->smk_initialized = 1;
257 spin_unlock(&sp->smk_sblock);
258
259 for (op = data; op != NULL; op = commap) {
260 commap = strchr(op, ',');
261 if (commap != NULL)
262 *commap++ = '\0';
263
264 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
265 op += strlen(SMK_FSHAT);
266 nsp = smk_import(op, 0);
267 if (nsp != NULL)
268 sp->smk_hat = nsp;
269 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
270 op += strlen(SMK_FSFLOOR);
271 nsp = smk_import(op, 0);
272 if (nsp != NULL)
273 sp->smk_floor = nsp;
274 } else if (strncmp(op, SMK_FSDEFAULT,
275 strlen(SMK_FSDEFAULT)) == 0) {
276 op += strlen(SMK_FSDEFAULT);
277 nsp = smk_import(op, 0);
278 if (nsp != NULL)
279 sp->smk_default = nsp;
280 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
281 op += strlen(SMK_FSROOT);
282 nsp = smk_import(op, 0);
283 if (nsp != NULL)
284 sp->smk_root = nsp;
285 }
286 }
287
288 /*
289 * Initialize the root inode.
290 */
291 isp = inode->i_security;
292 if (isp == NULL)
293 inode->i_security = new_inode_smack(sp->smk_root);
294 else
295 isp->smk_inode = sp->smk_root;
296
297 return 0;
298}
299
300/**
301 * smack_sb_statfs - Smack check on statfs
302 * @dentry: identifies the file system in question
303 *
304 * Returns 0 if current can read the floor of the filesystem,
305 * and error code otherwise
306 */
307static int smack_sb_statfs(struct dentry *dentry)
308{
309 struct superblock_smack *sbp = dentry->d_sb->s_security;
310
311 return smk_curacc(sbp->smk_floor, MAY_READ);
312}
313
314/**
315 * smack_sb_mount - Smack check for mounting
316 * @dev_name: unused
317 * @nd: mount point
318 * @type: unused
319 * @flags: unused
320 * @data: unused
321 *
322 * Returns 0 if current can write the floor of the filesystem
323 * being mounted on, an error code otherwise.
324 */
325static int smack_sb_mount(char *dev_name, struct nameidata *nd,
326 char *type, unsigned long flags, void *data)
327{
328 struct superblock_smack *sbp = nd->mnt->mnt_sb->s_security;
329
330 return smk_curacc(sbp->smk_floor, MAY_WRITE);
331}
332
333/**
334 * smack_sb_umount - Smack check for unmounting
335 * @mnt: file system to unmount
336 * @flags: unused
337 *
338 * Returns 0 if current can write the floor of the filesystem
339 * being unmounted, an error code otherwise.
340 */
341static int smack_sb_umount(struct vfsmount *mnt, int flags)
342{
343 struct superblock_smack *sbp;
344
345 sbp = mnt->mnt_sb->s_security;
346
347 return smk_curacc(sbp->smk_floor, MAY_WRITE);
348}
349
350/*
351 * Inode hooks
352 */
353
354/**
355 * smack_inode_alloc_security - allocate an inode blob
356 * @inode - the inode in need of a blob
357 *
358 * Returns 0 if it gets a blob, -ENOMEM otherwise
359 */
360static int smack_inode_alloc_security(struct inode *inode)
361{
362 inode->i_security = new_inode_smack(current->security);
363 if (inode->i_security == NULL)
364 return -ENOMEM;
365 return 0;
366}
367
368/**
369 * smack_inode_free_security - free an inode blob
370 * @inode - the inode with a blob
371 *
372 * Clears the blob pointer in inode
373 */
374static void smack_inode_free_security(struct inode *inode)
375{
376 kfree(inode->i_security);
377 inode->i_security = NULL;
378}
379
380/**
381 * smack_inode_init_security - copy out the smack from an inode
382 * @inode: the inode
383 * @dir: unused
384 * @name: where to put the attribute name
385 * @value: where to put the attribute value
386 * @len: where to put the length of the attribute
387 *
388 * Returns 0 if it all works out, -ENOMEM if there's no memory
389 */
390static int smack_inode_init_security(struct inode *inode, struct inode *dir,
391 char **name, void **value, size_t *len)
392{
393 char *isp = smk_of_inode(inode);
394
395 if (name) {
396 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
397 if (*name == NULL)
398 return -ENOMEM;
399 }
400
401 if (value) {
402 *value = kstrdup(isp, GFP_KERNEL);
403 if (*value == NULL)
404 return -ENOMEM;
405 }
406
407 if (len)
408 *len = strlen(isp) + 1;
409
410 return 0;
411}
412
413/**
414 * smack_inode_link - Smack check on link
415 * @old_dentry: the existing object
416 * @dir: unused
417 * @new_dentry: the new object
418 *
419 * Returns 0 if access is permitted, an error code otherwise
420 */
421static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
422 struct dentry *new_dentry)
423{
424 int rc;
425 char *isp;
426
427 isp = smk_of_inode(old_dentry->d_inode);
428 rc = smk_curacc(isp, MAY_WRITE);
429
430 if (rc == 0 && new_dentry->d_inode != NULL) {
431 isp = smk_of_inode(new_dentry->d_inode);
432 rc = smk_curacc(isp, MAY_WRITE);
433 }
434
435 return rc;
436}
437
438/**
439 * smack_inode_unlink - Smack check on inode deletion
440 * @dir: containing directory object
441 * @dentry: file to unlink
442 *
443 * Returns 0 if current can write the containing directory
444 * and the object, error code otherwise
445 */
446static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
447{
448 struct inode *ip = dentry->d_inode;
449 int rc;
450
451 /*
452 * You need write access to the thing you're unlinking
453 */
454 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE);
455 if (rc == 0)
456 /*
457 * You also need write access to the containing directory
458 */
459 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
460
461 return rc;
462}
463
464/**
465 * smack_inode_rmdir - Smack check on directory deletion
466 * @dir: containing directory object
467 * @dentry: directory to unlink
468 *
469 * Returns 0 if current can write the containing directory
470 * and the directory, error code otherwise
471 */
472static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
473{
474 int rc;
475
476 /*
477 * You need write access to the thing you're removing
478 */
479 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
480 if (rc == 0)
481 /*
482 * You also need write access to the containing directory
483 */
484 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
485
486 return rc;
487}
488
489/**
490 * smack_inode_rename - Smack check on rename
491 * @old_inode: the old directory
492 * @old_dentry: unused
493 * @new_inode: the new directory
494 * @new_dentry: unused
495 *
496 * Read and write access is required on both the old and
497 * new directories.
498 *
499 * Returns 0 if access is permitted, an error code otherwise
500 */
501static int smack_inode_rename(struct inode *old_inode,
502 struct dentry *old_dentry,
503 struct inode *new_inode,
504 struct dentry *new_dentry)
505{
506 int rc;
507 char *isp;
508
509 isp = smk_of_inode(old_dentry->d_inode);
510 rc = smk_curacc(isp, MAY_READWRITE);
511
512 if (rc == 0 && new_dentry->d_inode != NULL) {
513 isp = smk_of_inode(new_dentry->d_inode);
514 rc = smk_curacc(isp, MAY_READWRITE);
515 }
516
517 return rc;
518}
519
520/**
521 * smack_inode_permission - Smack version of permission()
522 * @inode: the inode in question
523 * @mask: the access requested
524 * @nd: unused
525 *
526 * This is the important Smack hook.
527 *
528 * Returns 0 if access is permitted, -EACCES otherwise
529 */
530static int smack_inode_permission(struct inode *inode, int mask,
531 struct nameidata *nd)
532{
533 /*
534 * No permission to check. Existence test. Yup, it's there.
535 */
536 if (mask == 0)
537 return 0;
538
539 return smk_curacc(smk_of_inode(inode), mask);
540}
541
542/**
543 * smack_inode_setattr - Smack check for setting attributes
544 * @dentry: the object
545 * @iattr: for the force flag
546 *
547 * Returns 0 if access is permitted, an error code otherwise
548 */
549static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
550{
551 /*
552 * Need to allow for clearing the setuid bit.
553 */
554 if (iattr->ia_valid & ATTR_FORCE)
555 return 0;
556
557 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
558}
559
560/**
561 * smack_inode_getattr - Smack check for getting attributes
562 * @mnt: unused
563 * @dentry: the object
564 *
565 * Returns 0 if access is permitted, an error code otherwise
566 */
567static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
568{
569 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
570}
571
572/**
573 * smack_inode_setxattr - Smack check for setting xattrs
574 * @dentry: the object
575 * @name: name of the attribute
576 * @value: unused
577 * @size: unused
578 * @flags: unused
579 *
580 * This protects the Smack attribute explicitly.
581 *
582 * Returns 0 if access is permitted, an error code otherwise
583 */
584static int smack_inode_setxattr(struct dentry *dentry, char *name,
585 void *value, size_t size, int flags)
586{
587 if (!capable(CAP_MAC_ADMIN)) {
588 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
589 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
590 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0)
591 return -EPERM;
592 }
593
594 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
595}
596
597/**
598 * smack_inode_post_setxattr - Apply the Smack update approved above
599 * @dentry: object
600 * @name: attribute name
601 * @value: attribute value
602 * @size: attribute size
603 * @flags: unused
604 *
605 * Set the pointer in the inode blob to the entry found
606 * in the master label list.
607 */
608static void smack_inode_post_setxattr(struct dentry *dentry, char *name,
609 void *value, size_t size, int flags)
610{
611 struct inode_smack *isp;
612 char *nsp;
613
614 /*
615 * Not SMACK
616 */
617 if (strcmp(name, XATTR_NAME_SMACK))
618 return;
619
620 if (size >= SMK_LABELLEN)
621 return;
622
623 isp = dentry->d_inode->i_security;
624
625 /*
626 * No locking is done here. This is a pointer
627 * assignment.
628 */
629 nsp = smk_import(value, size);
630 if (nsp != NULL)
631 isp->smk_inode = nsp;
632 else
633 isp->smk_inode = smack_known_invalid.smk_known;
634
635 return;
636}
637
638/*
639 * smack_inode_getxattr - Smack check on getxattr
640 * @dentry: the object
641 * @name: unused
642 *
643 * Returns 0 if access is permitted, an error code otherwise
644 */
645static int smack_inode_getxattr(struct dentry *dentry, char *name)
646{
647 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
648}
649
650/*
651 * smack_inode_removexattr - Smack check on removexattr
652 * @dentry: the object
653 * @name: name of the attribute
654 *
655 * Removing the Smack attribute requires CAP_MAC_ADMIN
656 *
657 * Returns 0 if access is permitted, an error code otherwise
658 */
659static int smack_inode_removexattr(struct dentry *dentry, char *name)
660{
661 if (strcmp(name, XATTR_NAME_SMACK) == 0 && !capable(CAP_MAC_ADMIN))
662 return -EPERM;
663
664 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
665}
666
667/**
668 * smack_inode_getsecurity - get smack xattrs
669 * @inode: the object
670 * @name: attribute name
671 * @buffer: where to put the result
672 * @size: size of the buffer
673 * @err: unused
674 *
675 * Returns the size of the attribute or an error code
676 */
677static int smack_inode_getsecurity(const struct inode *inode,
678 const char *name, void **buffer,
679 bool alloc)
680{
681 struct socket_smack *ssp;
682 struct socket *sock;
683 struct super_block *sbp;
684 struct inode *ip = (struct inode *)inode;
685 char *isp;
686 int ilen;
687 int rc = 0;
688
689 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
690 isp = smk_of_inode(inode);
691 ilen = strlen(isp) + 1;
692 *buffer = isp;
693 return ilen;
694 }
695
696 /*
697 * The rest of the Smack xattrs are only on sockets.
698 */
699 sbp = ip->i_sb;
700 if (sbp->s_magic != SOCKFS_MAGIC)
701 return -EOPNOTSUPP;
702
703 sock = SOCKET_I(ip);
704 if (sock == NULL)
705 return -EOPNOTSUPP;
706
707 ssp = sock->sk->sk_security;
708
709 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
710 isp = ssp->smk_in;
711 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
712 isp = ssp->smk_out;
713 else
714 return -EOPNOTSUPP;
715
716 ilen = strlen(isp) + 1;
717 if (rc == 0) {
718 *buffer = isp;
719 rc = ilen;
720 }
721
722 return rc;
723}
724
725
726/**
727 * smack_inode_listsecurity - list the Smack attributes
728 * @inode: the object
729 * @buffer: where they go
730 * @buffer_size: size of buffer
731 *
732 * Returns 0 on success, -EINVAL otherwise
733 */
734static int smack_inode_listsecurity(struct inode *inode, char *buffer,
735 size_t buffer_size)
736{
737 int len = strlen(XATTR_NAME_SMACK);
738
739 if (buffer != NULL && len <= buffer_size) {
740 memcpy(buffer, XATTR_NAME_SMACK, len);
741 return len;
742 }
743 return -EINVAL;
744}
745
746/*
747 * File Hooks
748 */
749
750/**
751 * smack_file_permission - Smack check on file operations
752 * @file: unused
753 * @mask: unused
754 *
755 * Returns 0
756 *
757 * Should access checks be done on each read or write?
758 * UNICOS and SELinux say yes.
759 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
760 *
761 * I'll say no for now. Smack does not do the frequent
762 * label changing that SELinux does.
763 */
764static int smack_file_permission(struct file *file, int mask)
765{
766 return 0;
767}
768
769/**
770 * smack_file_alloc_security - assign a file security blob
771 * @file: the object
772 *
773 * The security blob for a file is a pointer to the master
774 * label list, so no allocation is done.
775 *
776 * Returns 0
777 */
778static int smack_file_alloc_security(struct file *file)
779{
780 file->f_security = current->security;
781 return 0;
782}
783
784/**
785 * smack_file_free_security - clear a file security blob
786 * @file: the object
787 *
788 * The security blob for a file is a pointer to the master
789 * label list, so no memory is freed.
790 */
791static void smack_file_free_security(struct file *file)
792{
793 file->f_security = NULL;
794}
795
796/**
797 * smack_file_ioctl - Smack check on ioctls
798 * @file: the object
799 * @cmd: what to do
800 * @arg: unused
801 *
802 * Relies heavily on the correct use of the ioctl command conventions.
803 *
804 * Returns 0 if allowed, error code otherwise
805 */
806static int smack_file_ioctl(struct file *file, unsigned int cmd,
807 unsigned long arg)
808{
809 int rc = 0;
810
811 if (_IOC_DIR(cmd) & _IOC_WRITE)
812 rc = smk_curacc(file->f_security, MAY_WRITE);
813
814 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
815 rc = smk_curacc(file->f_security, MAY_READ);
816
817 return rc;
818}
819
820/**
821 * smack_file_lock - Smack check on file locking
822 * @file: the object
823 * @cmd unused
824 *
825 * Returns 0 if current has write access, error code otherwise
826 */
827static int smack_file_lock(struct file *file, unsigned int cmd)
828{
829 return smk_curacc(file->f_security, MAY_WRITE);
830}
831
832/**
833 * smack_file_fcntl - Smack check on fcntl
834 * @file: the object
835 * @cmd: what action to check
836 * @arg: unused
837 *
838 * Returns 0 if current has access, error code otherwise
839 */
840static int smack_file_fcntl(struct file *file, unsigned int cmd,
841 unsigned long arg)
842{
843 int rc;
844
845 switch (cmd) {
846 case F_DUPFD:
847 case F_GETFD:
848 case F_GETFL:
849 case F_GETLK:
850 case F_GETOWN:
851 case F_GETSIG:
852 rc = smk_curacc(file->f_security, MAY_READ);
853 break;
854 case F_SETFD:
855 case F_SETFL:
856 case F_SETLK:
857 case F_SETLKW:
858 case F_SETOWN:
859 case F_SETSIG:
860 rc = smk_curacc(file->f_security, MAY_WRITE);
861 break;
862 default:
863 rc = smk_curacc(file->f_security, MAY_READWRITE);
864 }
865
866 return rc;
867}
868
869/**
870 * smack_file_set_fowner - set the file security blob value
871 * @file: object in question
872 *
873 * Returns 0
874 * Further research may be required on this one.
875 */
876static int smack_file_set_fowner(struct file *file)
877{
878 file->f_security = current->security;
879 return 0;
880}
881
882/**
883 * smack_file_send_sigiotask - Smack on sigio
884 * @tsk: The target task
885 * @fown: the object the signal come from
886 * @signum: unused
887 *
888 * Allow a privileged task to get signals even if it shouldn't
889 *
890 * Returns 0 if a subject with the object's smack could
891 * write to the task, an error code otherwise.
892 */
893static int smack_file_send_sigiotask(struct task_struct *tsk,
894 struct fown_struct *fown, int signum)
895{
896 struct file *file;
897 int rc;
898
899 /*
900 * struct fown_struct is never outside the context of a struct file
901 */
902 file = container_of(fown, struct file, f_owner);
903 rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
904 if (rc != 0 && __capable(tsk, CAP_MAC_OVERRIDE))
905 return 0;
906 return rc;
907}
908
909/**
910 * smack_file_receive - Smack file receive check
911 * @file: the object
912 *
913 * Returns 0 if current has access, error code otherwise
914 */
915static int smack_file_receive(struct file *file)
916{
917 int may = 0;
918
919 /*
920 * This code relies on bitmasks.
921 */
922 if (file->f_mode & FMODE_READ)
923 may = MAY_READ;
924 if (file->f_mode & FMODE_WRITE)
925 may |= MAY_WRITE;
926
927 return smk_curacc(file->f_security, may);
928}
929
930/*
931 * Task hooks
932 */
933
934/**
935 * smack_task_alloc_security - "allocate" a task blob
936 * @tsk: the task in need of a blob
937 *
938 * Smack isn't using copies of blobs. Everyone
939 * points to an immutable list. No alloc required.
940 * No data copy required.
941 *
942 * Always returns 0
943 */
944static int smack_task_alloc_security(struct task_struct *tsk)
945{
946 tsk->security = current->security;
947
948 return 0;
949}
950
951/**
952 * smack_task_free_security - "free" a task blob
953 * @task: the task with the blob
954 *
955 * Smack isn't using copies of blobs. Everyone
956 * points to an immutable list. The blobs never go away.
957 * There is no leak here.
958 */
959static void smack_task_free_security(struct task_struct *task)
960{
961 task->security = NULL;
962}
963
964/**
965 * smack_task_setpgid - Smack check on setting pgid
966 * @p: the task object
967 * @pgid: unused
968 *
969 * Return 0 if write access is permitted
970 */
971static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
972{
973 return smk_curacc(p->security, MAY_WRITE);
974}
975
976/**
977 * smack_task_getpgid - Smack access check for getpgid
978 * @p: the object task
979 *
980 * Returns 0 if current can read the object task, error code otherwise
981 */
982static int smack_task_getpgid(struct task_struct *p)
983{
984 return smk_curacc(p->security, MAY_READ);
985}
986
987/**
988 * smack_task_getsid - Smack access check for getsid
989 * @p: the object task
990 *
991 * Returns 0 if current can read the object task, error code otherwise
992 */
993static int smack_task_getsid(struct task_struct *p)
994{
995 return smk_curacc(p->security, MAY_READ);
996}
997
998/**
999 * smack_task_getsecid - get the secid of the task
1000 * @p: the object task
1001 * @secid: where to put the result
1002 *
1003 * Sets the secid to contain a u32 version of the smack label.
1004 */
1005static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1006{
1007 *secid = smack_to_secid(p->security);
1008}
1009
1010/**
1011 * smack_task_setnice - Smack check on setting nice
1012 * @p: the task object
1013 * @nice: unused
1014 *
1015 * Return 0 if write access is permitted
1016 */
1017static int smack_task_setnice(struct task_struct *p, int nice)
1018{
1019 return smk_curacc(p->security, MAY_WRITE);
1020}
1021
1022/**
1023 * smack_task_setioprio - Smack check on setting ioprio
1024 * @p: the task object
1025 * @ioprio: unused
1026 *
1027 * Return 0 if write access is permitted
1028 */
1029static int smack_task_setioprio(struct task_struct *p, int ioprio)
1030{
1031 return smk_curacc(p->security, MAY_WRITE);
1032}
1033
1034/**
1035 * smack_task_getioprio - Smack check on reading ioprio
1036 * @p: the task object
1037 *
1038 * Return 0 if read access is permitted
1039 */
1040static int smack_task_getioprio(struct task_struct *p)
1041{
1042 return smk_curacc(p->security, MAY_READ);
1043}
1044
1045/**
1046 * smack_task_setscheduler - Smack check on setting scheduler
1047 * @p: the task object
1048 * @policy: unused
1049 * @lp: unused
1050 *
1051 * Return 0 if read access is permitted
1052 */
1053static int smack_task_setscheduler(struct task_struct *p, int policy,
1054 struct sched_param *lp)
1055{
1056 return smk_curacc(p->security, MAY_WRITE);
1057}
1058
1059/**
1060 * smack_task_getscheduler - Smack check on reading scheduler
1061 * @p: the task object
1062 *
1063 * Return 0 if read access is permitted
1064 */
1065static int smack_task_getscheduler(struct task_struct *p)
1066{
1067 return smk_curacc(p->security, MAY_READ);
1068}
1069
1070/**
1071 * smack_task_movememory - Smack check on moving memory
1072 * @p: the task object
1073 *
1074 * Return 0 if write access is permitted
1075 */
1076static int smack_task_movememory(struct task_struct *p)
1077{
1078 return smk_curacc(p->security, MAY_WRITE);
1079}
1080
1081/**
1082 * smack_task_kill - Smack check on signal delivery
1083 * @p: the task object
1084 * @info: unused
1085 * @sig: unused
1086 * @secid: identifies the smack to use in lieu of current's
1087 *
1088 * Return 0 if write access is permitted
1089 *
1090 * The secid behavior is an artifact of an SELinux hack
1091 * in the USB code. Someday it may go away.
1092 */
1093static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1094 int sig, u32 secid)
1095{
1096 /*
1097 * Special cases where signals really ought to go through
1098 * in spite of policy. Stephen Smalley suggests it may
1099 * make sense to change the caller so that it doesn't
1100 * bother with the LSM hook in these cases.
1101 */
1102 if (info != SEND_SIG_NOINFO &&
1103 (is_si_special(info) || SI_FROMKERNEL(info)))
1104 return 0;
1105 /*
1106 * Sending a signal requires that the sender
1107 * can write the receiver.
1108 */
1109 if (secid == 0)
1110 return smk_curacc(p->security, MAY_WRITE);
1111 /*
1112 * If the secid isn't 0 we're dealing with some USB IO
1113 * specific behavior. This is not clean. For one thing
1114 * we can't take privilege into account.
1115 */
1116 return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
1117}
1118
1119/**
1120 * smack_task_wait - Smack access check for waiting
1121 * @p: task to wait for
1122 *
1123 * Returns 0 if current can wait for p, error code otherwise
1124 */
1125static int smack_task_wait(struct task_struct *p)
1126{
1127 int rc;
1128
1129 rc = smk_access(current->security, p->security, MAY_WRITE);
1130 if (rc == 0)
1131 return 0;
1132
1133 /*
1134 * Allow the operation to succeed if either task
1135 * has privilege to perform operations that might
1136 * account for the smack labels having gotten to
1137 * be different in the first place.
1138 *
1139 * This breaks the strict subjet/object access
1140 * control ideal, taking the object's privilege
1141 * state into account in the decision as well as
1142 * the smack value.
1143 */
1144 if (capable(CAP_MAC_OVERRIDE) || __capable(p, CAP_MAC_OVERRIDE))
1145 return 0;
1146
1147 return rc;
1148}
1149
1150/**
1151 * smack_task_to_inode - copy task smack into the inode blob
1152 * @p: task to copy from
1153 * inode: inode to copy to
1154 *
1155 * Sets the smack pointer in the inode security blob
1156 */
1157static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1158{
1159 struct inode_smack *isp = inode->i_security;
1160 isp->smk_inode = p->security;
1161}
1162
1163/*
1164 * Socket hooks.
1165 */
1166
1167/**
1168 * smack_sk_alloc_security - Allocate a socket blob
1169 * @sk: the socket
1170 * @family: unused
1171 * @priority: memory allocation priority
1172 *
1173 * Assign Smack pointers to current
1174 *
1175 * Returns 0 on success, -ENOMEM is there's no memory
1176 */
1177static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1178{
1179 char *csp = current->security;
1180 struct socket_smack *ssp;
1181
1182 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1183 if (ssp == NULL)
1184 return -ENOMEM;
1185
1186 ssp->smk_in = csp;
1187 ssp->smk_out = csp;
1188 ssp->smk_packet[0] = '\0';
1189
1190 sk->sk_security = ssp;
1191
1192 return 0;
1193}
1194
1195/**
1196 * smack_sk_free_security - Free a socket blob
1197 * @sk: the socket
1198 *
1199 * Clears the blob pointer
1200 */
1201static void smack_sk_free_security(struct sock *sk)
1202{
1203 kfree(sk->sk_security);
1204}
1205
1206/**
1207 * smack_set_catset - convert a capset to netlabel mls categories
1208 * @catset: the Smack categories
1209 * @sap: where to put the netlabel categories
1210 *
1211 * Allocates and fills attr.mls.cat
1212 */
1213static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1214{
1215 unsigned char *cp;
1216 unsigned char m;
1217 int cat;
1218 int rc;
1219 int byte;
1220
1221 if (catset == 0)
1222 return;
1223
1224 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1225 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1226 sap->attr.mls.cat->startbit = 0;
1227
1228 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1229 for (m = 0x80; m != 0; m >>= 1, cat++) {
1230 if ((m & *cp) == 0)
1231 continue;
1232 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1233 cat, GFP_ATOMIC);
1234 }
1235}
1236
1237/**
1238 * smack_to_secattr - fill a secattr from a smack value
1239 * @smack: the smack value
1240 * @nlsp: where the result goes
1241 *
1242 * Casey says that CIPSO is good enough for now.
1243 * It can be used to effect.
1244 * It can also be abused to effect when necessary.
1245 * Appologies to the TSIG group in general and GW in particular.
1246 */
1247static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1248{
1249 struct smack_cipso cipso;
1250 int rc;
1251
1252 switch (smack_net_nltype) {
1253 case NETLBL_NLTYPE_CIPSOV4:
1254 nlsp->domain = NULL;
1255 nlsp->flags = NETLBL_SECATTR_DOMAIN;
1256 nlsp->flags |= NETLBL_SECATTR_MLS_LVL;
1257
1258 rc = smack_to_cipso(smack, &cipso);
1259 if (rc == 0) {
1260 nlsp->attr.mls.lvl = cipso.smk_level;
1261 smack_set_catset(cipso.smk_catset, nlsp);
1262 } else {
1263 nlsp->attr.mls.lvl = smack_cipso_direct;
1264 smack_set_catset(smack, nlsp);
1265 }
1266 break;
1267 default:
1268 break;
1269 }
1270}
1271
1272/**
1273 * smack_netlabel - Set the secattr on a socket
1274 * @sk: the socket
1275 *
1276 * Convert the outbound smack value (smk_out) to a
1277 * secattr and attach it to the socket.
1278 *
1279 * Returns 0 on success or an error code
1280 */
1281static int smack_netlabel(struct sock *sk)
1282{
1283 struct socket_smack *ssp = sk->sk_security;
1284 struct netlbl_lsm_secattr secattr;
1285 int rc = 0;
1286
1287 netlbl_secattr_init(&secattr);
1288 smack_to_secattr(ssp->smk_out, &secattr);
1289 if (secattr.flags != NETLBL_SECATTR_NONE)
1290 rc = netlbl_sock_setattr(sk, &secattr);
1291
1292 netlbl_secattr_destroy(&secattr);
1293 return rc;
1294}
1295
1296/**
1297 * smack_inode_setsecurity - set smack xattrs
1298 * @inode: the object
1299 * @name: attribute name
1300 * @value: attribute value
1301 * @size: size of the attribute
1302 * @flags: unused
1303 *
1304 * Sets the named attribute in the appropriate blob
1305 *
1306 * Returns 0 on success, or an error code
1307 */
1308static int smack_inode_setsecurity(struct inode *inode, const char *name,
1309 const void *value, size_t size, int flags)
1310{
1311 char *sp;
1312 struct inode_smack *nsp = inode->i_security;
1313 struct socket_smack *ssp;
1314 struct socket *sock;
1315
1316 if (value == NULL || size > SMK_LABELLEN)
1317 return -EACCES;
1318
1319 sp = smk_import(value, size);
1320 if (sp == NULL)
1321 return -EINVAL;
1322
1323 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1324 nsp->smk_inode = sp;
1325 return 0;
1326 }
1327 /*
1328 * The rest of the Smack xattrs are only on sockets.
1329 */
1330 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1331 return -EOPNOTSUPP;
1332
1333 sock = SOCKET_I(inode);
1334 if (sock == NULL)
1335 return -EOPNOTSUPP;
1336
1337 ssp = sock->sk->sk_security;
1338
1339 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1340 ssp->smk_in = sp;
1341 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1342 ssp->smk_out = sp;
1343 return smack_netlabel(sock->sk);
1344 } else
1345 return -EOPNOTSUPP;
1346
1347 return 0;
1348}
1349
1350/**
1351 * smack_socket_post_create - finish socket setup
1352 * @sock: the socket
1353 * @family: protocol family
1354 * @type: unused
1355 * @protocol: unused
1356 * @kern: unused
1357 *
1358 * Sets the netlabel information on the socket
1359 *
1360 * Returns 0 on success, and error code otherwise
1361 */
1362static int smack_socket_post_create(struct socket *sock, int family,
1363 int type, int protocol, int kern)
1364{
1365 if (family != PF_INET)
1366 return 0;
1367 /*
1368 * Set the outbound netlbl.
1369 */
1370 return smack_netlabel(sock->sk);
1371}
1372
1373/**
1374 * smack_flags_to_may - convert S_ to MAY_ values
1375 * @flags: the S_ value
1376 *
1377 * Returns the equivalent MAY_ value
1378 */
1379static int smack_flags_to_may(int flags)
1380{
1381 int may = 0;
1382
1383 if (flags & S_IRUGO)
1384 may |= MAY_READ;
1385 if (flags & S_IWUGO)
1386 may |= MAY_WRITE;
1387 if (flags & S_IXUGO)
1388 may |= MAY_EXEC;
1389
1390 return may;
1391}
1392
1393/**
1394 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1395 * @msg: the object
1396 *
1397 * Returns 0
1398 */
1399static int smack_msg_msg_alloc_security(struct msg_msg *msg)
1400{
1401 msg->security = current->security;
1402 return 0;
1403}
1404
1405/**
1406 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1407 * @msg: the object
1408 *
1409 * Clears the blob pointer
1410 */
1411static void smack_msg_msg_free_security(struct msg_msg *msg)
1412{
1413 msg->security = NULL;
1414}
1415
1416/**
1417 * smack_of_shm - the smack pointer for the shm
1418 * @shp: the object
1419 *
1420 * Returns a pointer to the smack value
1421 */
1422static char *smack_of_shm(struct shmid_kernel *shp)
1423{
1424 return (char *)shp->shm_perm.security;
1425}
1426
1427/**
1428 * smack_shm_alloc_security - Set the security blob for shm
1429 * @shp: the object
1430 *
1431 * Returns 0
1432 */
1433static int smack_shm_alloc_security(struct shmid_kernel *shp)
1434{
1435 struct kern_ipc_perm *isp = &shp->shm_perm;
1436
1437 isp->security = current->security;
1438 return 0;
1439}
1440
1441/**
1442 * smack_shm_free_security - Clear the security blob for shm
1443 * @shp: the object
1444 *
1445 * Clears the blob pointer
1446 */
1447static void smack_shm_free_security(struct shmid_kernel *shp)
1448{
1449 struct kern_ipc_perm *isp = &shp->shm_perm;
1450
1451 isp->security = NULL;
1452}
1453
1454/**
1455 * smack_shm_associate - Smack access check for shm
1456 * @shp: the object
1457 * @shmflg: access requested
1458 *
1459 * Returns 0 if current has the requested access, error code otherwise
1460 */
1461static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
1462{
1463 char *ssp = smack_of_shm(shp);
1464 int may;
1465
1466 may = smack_flags_to_may(shmflg);
1467 return smk_curacc(ssp, may);
1468}
1469
1470/**
1471 * smack_shm_shmctl - Smack access check for shm
1472 * @shp: the object
1473 * @cmd: what it wants to do
1474 *
1475 * Returns 0 if current has the requested access, error code otherwise
1476 */
1477static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
1478{
1479 char *ssp = smack_of_shm(shp);
1480 int may;
1481
1482 switch (cmd) {
1483 case IPC_STAT:
1484 case SHM_STAT:
1485 may = MAY_READ;
1486 break;
1487 case IPC_SET:
1488 case SHM_LOCK:
1489 case SHM_UNLOCK:
1490 case IPC_RMID:
1491 may = MAY_READWRITE;
1492 break;
1493 case IPC_INFO:
1494 case SHM_INFO:
1495 /*
1496 * System level information.
1497 */
1498 return 0;
1499 default:
1500 return -EINVAL;
1501 }
1502
1503 return smk_curacc(ssp, may);
1504}
1505
1506/**
1507 * smack_shm_shmat - Smack access for shmat
1508 * @shp: the object
1509 * @shmaddr: unused
1510 * @shmflg: access requested
1511 *
1512 * Returns 0 if current has the requested access, error code otherwise
1513 */
1514static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
1515 int shmflg)
1516{
1517 char *ssp = smack_of_shm(shp);
1518 int may;
1519
1520 may = smack_flags_to_may(shmflg);
1521 return smk_curacc(ssp, may);
1522}
1523
1524/**
1525 * smack_of_sem - the smack pointer for the sem
1526 * @sma: the object
1527 *
1528 * Returns a pointer to the smack value
1529 */
1530static char *smack_of_sem(struct sem_array *sma)
1531{
1532 return (char *)sma->sem_perm.security;
1533}
1534
1535/**
1536 * smack_sem_alloc_security - Set the security blob for sem
1537 * @sma: the object
1538 *
1539 * Returns 0
1540 */
1541static int smack_sem_alloc_security(struct sem_array *sma)
1542{
1543 struct kern_ipc_perm *isp = &sma->sem_perm;
1544
1545 isp->security = current->security;
1546 return 0;
1547}
1548
1549/**
1550 * smack_sem_free_security - Clear the security blob for sem
1551 * @sma: the object
1552 *
1553 * Clears the blob pointer
1554 */
1555static void smack_sem_free_security(struct sem_array *sma)
1556{
1557 struct kern_ipc_perm *isp = &sma->sem_perm;
1558
1559 isp->security = NULL;
1560}
1561
1562/**
1563 * smack_sem_associate - Smack access check for sem
1564 * @sma: the object
1565 * @semflg: access requested
1566 *
1567 * Returns 0 if current has the requested access, error code otherwise
1568 */
1569static int smack_sem_associate(struct sem_array *sma, int semflg)
1570{
1571 char *ssp = smack_of_sem(sma);
1572 int may;
1573
1574 may = smack_flags_to_may(semflg);
1575 return smk_curacc(ssp, may);
1576}
1577
1578/**
1579 * smack_sem_shmctl - Smack access check for sem
1580 * @sma: the object
1581 * @cmd: what it wants to do
1582 *
1583 * Returns 0 if current has the requested access, error code otherwise
1584 */
1585static int smack_sem_semctl(struct sem_array *sma, int cmd)
1586{
1587 char *ssp = smack_of_sem(sma);
1588 int may;
1589
1590 switch (cmd) {
1591 case GETPID:
1592 case GETNCNT:
1593 case GETZCNT:
1594 case GETVAL:
1595 case GETALL:
1596 case IPC_STAT:
1597 case SEM_STAT:
1598 may = MAY_READ;
1599 break;
1600 case SETVAL:
1601 case SETALL:
1602 case IPC_RMID:
1603 case IPC_SET:
1604 may = MAY_READWRITE;
1605 break;
1606 case IPC_INFO:
1607 case SEM_INFO:
1608 /*
1609 * System level information
1610 */
1611 return 0;
1612 default:
1613 return -EINVAL;
1614 }
1615
1616 return smk_curacc(ssp, may);
1617}
1618
1619/**
1620 * smack_sem_semop - Smack checks of semaphore operations
1621 * @sma: the object
1622 * @sops: unused
1623 * @nsops: unused
1624 * @alter: unused
1625 *
1626 * Treated as read and write in all cases.
1627 *
1628 * Returns 0 if access is allowed, error code otherwise
1629 */
1630static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
1631 unsigned nsops, int alter)
1632{
1633 char *ssp = smack_of_sem(sma);
1634
1635 return smk_curacc(ssp, MAY_READWRITE);
1636}
1637
1638/**
1639 * smack_msg_alloc_security - Set the security blob for msg
1640 * @msq: the object
1641 *
1642 * Returns 0
1643 */
1644static int smack_msg_queue_alloc_security(struct msg_queue *msq)
1645{
1646 struct kern_ipc_perm *kisp = &msq->q_perm;
1647
1648 kisp->security = current->security;
1649 return 0;
1650}
1651
1652/**
1653 * smack_msg_free_security - Clear the security blob for msg
1654 * @msq: the object
1655 *
1656 * Clears the blob pointer
1657 */
1658static void smack_msg_queue_free_security(struct msg_queue *msq)
1659{
1660 struct kern_ipc_perm *kisp = &msq->q_perm;
1661
1662 kisp->security = NULL;
1663}
1664
1665/**
1666 * smack_of_msq - the smack pointer for the msq
1667 * @msq: the object
1668 *
1669 * Returns a pointer to the smack value
1670 */
1671static char *smack_of_msq(struct msg_queue *msq)
1672{
1673 return (char *)msq->q_perm.security;
1674}
1675
1676/**
1677 * smack_msg_queue_associate - Smack access check for msg_queue
1678 * @msq: the object
1679 * @msqflg: access requested
1680 *
1681 * Returns 0 if current has the requested access, error code otherwise
1682 */
1683static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
1684{
1685 char *msp = smack_of_msq(msq);
1686 int may;
1687
1688 may = smack_flags_to_may(msqflg);
1689 return smk_curacc(msp, may);
1690}
1691
1692/**
1693 * smack_msg_queue_msgctl - Smack access check for msg_queue
1694 * @msq: the object
1695 * @cmd: what it wants to do
1696 *
1697 * Returns 0 if current has the requested access, error code otherwise
1698 */
1699static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
1700{
1701 char *msp = smack_of_msq(msq);
1702 int may;
1703
1704 switch (cmd) {
1705 case IPC_STAT:
1706 case MSG_STAT:
1707 may = MAY_READ;
1708 break;
1709 case IPC_SET:
1710 case IPC_RMID:
1711 may = MAY_READWRITE;
1712 break;
1713 case IPC_INFO:
1714 case MSG_INFO:
1715 /*
1716 * System level information
1717 */
1718 return 0;
1719 default:
1720 return -EINVAL;
1721 }
1722
1723 return smk_curacc(msp, may);
1724}
1725
1726/**
1727 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1728 * @msq: the object
1729 * @msg: unused
1730 * @msqflg: access requested
1731 *
1732 * Returns 0 if current has the requested access, error code otherwise
1733 */
1734static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
1735 int msqflg)
1736{
1737 char *msp = smack_of_msq(msq);
1738 int rc;
1739
1740 rc = smack_flags_to_may(msqflg);
1741 return smk_curacc(msp, rc);
1742}
1743
1744/**
1745 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1746 * @msq: the object
1747 * @msg: unused
1748 * @target: unused
1749 * @type: unused
1750 * @mode: unused
1751 *
1752 * Returns 0 if current has read and write access, error code otherwise
1753 */
1754static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
1755 struct task_struct *target, long type, int mode)
1756{
1757 char *msp = smack_of_msq(msq);
1758
1759 return smk_curacc(msp, MAY_READWRITE);
1760}
1761
1762/**
1763 * smack_ipc_permission - Smack access for ipc_permission()
1764 * @ipp: the object permissions
1765 * @flag: access requested
1766 *
1767 * Returns 0 if current has read and write access, error code otherwise
1768 */
1769static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
1770{
1771 char *isp = ipp->security;
1772 int may;
1773
1774 may = smack_flags_to_may(flag);
1775 return smk_curacc(isp, may);
1776}
1777
1778/**
1779 * smack_d_instantiate - Make sure the blob is correct on an inode
1780 * @opt_dentry: unused
1781 * @inode: the object
1782 *
1783 * Set the inode's security blob if it hasn't been done already.
1784 */
1785static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
1786{
1787 struct super_block *sbp;
1788 struct superblock_smack *sbsp;
1789 struct inode_smack *isp;
1790 char *csp = current->security;
1791 char *fetched;
1792 char *final;
1793 struct dentry *dp;
1794
1795 if (inode == NULL)
1796 return;
1797
1798 isp = inode->i_security;
1799
1800 mutex_lock(&isp->smk_lock);
1801 /*
1802 * If the inode is already instantiated
1803 * take the quick way out
1804 */
1805 if (isp->smk_flags & SMK_INODE_INSTANT)
1806 goto unlockandout;
1807
1808 sbp = inode->i_sb;
1809 sbsp = sbp->s_security;
1810 /*
1811 * We're going to use the superblock default label
1812 * if there's no label on the file.
1813 */
1814 final = sbsp->smk_default;
1815
1816 /*
1817 * This is pretty hackish.
1818 * Casey says that we shouldn't have to do
1819 * file system specific code, but it does help
1820 * with keeping it simple.
1821 */
1822 switch (sbp->s_magic) {
1823 case SMACK_MAGIC:
1824 /*
1825 * Casey says that it's a little embarassing
1826 * that the smack file system doesn't do
1827 * extended attributes.
1828 */
1829 final = smack_known_star.smk_known;
1830 break;
1831 case PIPEFS_MAGIC:
1832 /*
1833 * Casey says pipes are easy (?)
1834 */
1835 final = smack_known_star.smk_known;
1836 break;
1837 case DEVPTS_SUPER_MAGIC:
1838 /*
1839 * devpts seems content with the label of the task.
1840 * Programs that change smack have to treat the
1841 * pty with respect.
1842 */
1843 final = csp;
1844 break;
1845 case SOCKFS_MAGIC:
1846 /*
1847 * Casey says sockets get the smack of the task.
1848 */
1849 final = csp;
1850 break;
1851 case PROC_SUPER_MAGIC:
1852 /*
1853 * Casey says procfs appears not to care.
1854 * The superblock default suffices.
1855 */
1856 break;
1857 case TMPFS_MAGIC:
1858 /*
1859 * Device labels should come from the filesystem,
1860 * but watch out, because they're volitile,
1861 * getting recreated on every reboot.
1862 */
1863 final = smack_known_star.smk_known;
1864 /*
1865 * No break.
1866 *
1867 * If a smack value has been set we want to use it,
1868 * but since tmpfs isn't giving us the opportunity
1869 * to set mount options simulate setting the
1870 * superblock default.
1871 */
1872 default:
1873 /*
1874 * This isn't an understood special case.
1875 * Get the value from the xattr.
1876 *
1877 * No xattr support means, alas, no SMACK label.
1878 * Use the aforeapplied default.
1879 * It would be curious if the label of the task
1880 * does not match that assigned.
1881 */
1882 if (inode->i_op->getxattr == NULL)
1883 break;
1884 /*
1885 * Get the dentry for xattr.
1886 */
1887 if (opt_dentry == NULL) {
1888 dp = d_find_alias(inode);
1889 if (dp == NULL)
1890 break;
1891 } else {
1892 dp = dget(opt_dentry);
1893 if (dp == NULL)
1894 break;
1895 }
1896
1897 fetched = smk_fetch(inode, dp);
1898 if (fetched != NULL)
1899 final = fetched;
1900
1901 dput(dp);
1902 break;
1903 }
1904
1905 if (final == NULL)
1906 isp->smk_inode = csp;
1907 else
1908 isp->smk_inode = final;
1909
1910 isp->smk_flags |= SMK_INODE_INSTANT;
1911
1912unlockandout:
1913 mutex_unlock(&isp->smk_lock);
1914 return;
1915}
1916
1917/**
1918 * smack_getprocattr - Smack process attribute access
1919 * @p: the object task
1920 * @name: the name of the attribute in /proc/.../attr
1921 * @value: where to put the result
1922 *
1923 * Places a copy of the task Smack into value
1924 *
1925 * Returns the length of the smack label or an error code
1926 */
1927static int smack_getprocattr(struct task_struct *p, char *name, char **value)
1928{
1929 char *cp;
1930 int slen;
1931
1932 if (strcmp(name, "current") != 0)
1933 return -EINVAL;
1934
1935 cp = kstrdup(p->security, GFP_KERNEL);
1936 if (cp == NULL)
1937 return -ENOMEM;
1938
1939 slen = strlen(cp);
1940 *value = cp;
1941 return slen;
1942}
1943
1944/**
1945 * smack_setprocattr - Smack process attribute setting
1946 * @p: the object task
1947 * @name: the name of the attribute in /proc/.../attr
1948 * @value: the value to set
1949 * @size: the size of the value
1950 *
1951 * Sets the Smack value of the task. Only setting self
1952 * is permitted and only with privilege
1953 *
1954 * Returns the length of the smack label or an error code
1955 */
1956static int smack_setprocattr(struct task_struct *p, char *name,
1957 void *value, size_t size)
1958{
1959 char *newsmack;
1960
1961 if (!__capable(p, CAP_MAC_ADMIN))
1962 return -EPERM;
1963
1964 /*
1965 * Changing another process' Smack value is too dangerous
1966 * and supports no sane use case.
1967 */
1968 if (p != current)
1969 return -EPERM;
1970
1971 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
1972 return -EINVAL;
1973
1974 if (strcmp(name, "current") != 0)
1975 return -EINVAL;
1976
1977 newsmack = smk_import(value, size);
1978 if (newsmack == NULL)
1979 return -EINVAL;
1980
1981 p->security = newsmack;
1982 return size;
1983}
1984
1985/**
1986 * smack_unix_stream_connect - Smack access on UDS
1987 * @sock: one socket
1988 * @other: the other socket
1989 * @newsk: unused
1990 *
1991 * Return 0 if a subject with the smack of sock could access
1992 * an object with the smack of other, otherwise an error code
1993 */
1994static int smack_unix_stream_connect(struct socket *sock,
1995 struct socket *other, struct sock *newsk)
1996{
1997 struct inode *sp = SOCK_INODE(sock);
1998 struct inode *op = SOCK_INODE(other);
1999
2000 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE);
2001}
2002
2003/**
2004 * smack_unix_may_send - Smack access on UDS
2005 * @sock: one socket
2006 * @other: the other socket
2007 *
2008 * Return 0 if a subject with the smack of sock could access
2009 * an object with the smack of other, otherwise an error code
2010 */
2011static int smack_unix_may_send(struct socket *sock, struct socket *other)
2012{
2013 struct inode *sp = SOCK_INODE(sock);
2014 struct inode *op = SOCK_INODE(other);
2015
2016 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE);
2017}
2018
2019/**
2020 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2021 * pair to smack
2022 * @sap: netlabel secattr
2023 * @sip: where to put the result
2024 *
2025 * Copies a smack label into sip
2026 */
2027static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2028{
2029 char smack[SMK_LABELLEN];
2030 int pcat;
2031
2032 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) {
2033 /*
2034 * If there are flags but no level netlabel isn't
2035 * behaving the way we expect it to.
2036 *
2037 * Without guidance regarding the smack value
2038 * for the packet fall back on the network
2039 * ambient value.
2040 */
2041 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2042 return;
2043 }
2044 /*
2045 * Get the categories, if any
2046 */
2047 memset(smack, '\0', SMK_LABELLEN);
2048 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2049 for (pcat = -1;;) {
2050 pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat,
2051 pcat + 1);
2052 if (pcat < 0)
2053 break;
2054 smack_catset_bit(pcat, smack);
2055 }
2056 /*
2057 * If it is CIPSO using smack direct mapping
2058 * we are already done. WeeHee.
2059 */
2060 if (sap->attr.mls.lvl == smack_cipso_direct) {
2061 memcpy(sip, smack, SMK_MAXLEN);
2062 return;
2063 }
2064 /*
2065 * Look it up in the supplied table if it is not a direct mapping.
2066 */
2067 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2068 return;
2069}
2070
2071/**
2072 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2073 * @sk: socket
2074 * @skb: packet
2075 *
2076 * Returns 0 if the packet should be delivered, an error code otherwise
2077 */
2078static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2079{
2080 struct netlbl_lsm_secattr secattr;
2081 struct socket_smack *ssp = sk->sk_security;
2082 char smack[SMK_LABELLEN];
2083 int rc;
2084
2085 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2086 return 0;
2087
2088 /*
2089 * Translate what netlabel gave us.
2090 */
2091 memset(smack, '\0', SMK_LABELLEN);
2092 netlbl_secattr_init(&secattr);
2093 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2094 if (rc == 0)
2095 smack_from_secattr(&secattr, smack);
2096 else
2097 strncpy(smack, smack_net_ambient, SMK_MAXLEN);
2098 netlbl_secattr_destroy(&secattr);
2099 /*
2100 * Receiving a packet requires that the other end
2101 * be able to write here. Read access is not required.
2102 * This is the simplist possible security model
2103 * for networking.
2104 */
2105 return smk_access(smack, ssp->smk_in, MAY_WRITE);
2106}
2107
2108/**
2109 * smack_socket_getpeersec_stream - pull in packet label
2110 * @sock: the socket
2111 * @optval: user's destination
2112 * @optlen: size thereof
2113 * @len: max thereoe
2114 *
2115 * returns zero on success, an error code otherwise
2116 */
2117static int smack_socket_getpeersec_stream(struct socket *sock,
2118 char __user *optval,
2119 int __user *optlen, unsigned len)
2120{
2121 struct socket_smack *ssp;
2122 int slen;
2123 int rc = 0;
2124
2125 ssp = sock->sk->sk_security;
2126 slen = strlen(ssp->smk_packet) + 1;
2127
2128 if (slen > len)
2129 rc = -ERANGE;
2130 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2131 rc = -EFAULT;
2132
2133 if (put_user(slen, optlen) != 0)
2134 rc = -EFAULT;
2135
2136 return rc;
2137}
2138
2139
2140/**
2141 * smack_socket_getpeersec_dgram - pull in packet label
2142 * @sock: the socket
2143 * @skb: packet data
2144 * @secid: pointer to where to put the secid of the packet
2145 *
2146 * Sets the netlabel socket state on sk from parent
2147 */
2148static int smack_socket_getpeersec_dgram(struct socket *sock,
2149 struct sk_buff *skb, u32 *secid)
2150
2151{
2152 struct netlbl_lsm_secattr secattr;
2153 struct sock *sk;
2154 char smack[SMK_LABELLEN];
2155 int family = PF_INET;
2156 u32 s;
2157 int rc;
2158
2159 /*
2160 * Only works for families with packets.
2161 */
2162 if (sock != NULL) {
2163 sk = sock->sk;
2164 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2165 return 0;
2166 family = sk->sk_family;
2167 }
2168 /*
2169 * Translate what netlabel gave us.
2170 */
2171 memset(smack, '\0', SMK_LABELLEN);
2172 netlbl_secattr_init(&secattr);
2173 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2174 if (rc == 0)
2175 smack_from_secattr(&secattr, smack);
2176 netlbl_secattr_destroy(&secattr);
2177
2178 /*
2179 * Give up if we couldn't get anything
2180 */
2181 if (rc != 0)
2182 return rc;
2183
2184 s = smack_to_secid(smack);
2185 if (s == 0)
2186 return -EINVAL;
2187
2188 *secid = s;
2189 return 0;
2190}
2191
2192/**
2193 * smack_sock_graft - graft access state between two sockets
2194 * @sk: fresh sock
2195 * @parent: donor socket
2196 *
2197 * Sets the netlabel socket state on sk from parent
2198 */
2199static void smack_sock_graft(struct sock *sk, struct socket *parent)
2200{
2201 struct socket_smack *ssp;
2202 int rc;
2203
2204 if (sk == NULL)
2205 return;
2206
2207 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2208 return;
2209
2210 ssp = sk->sk_security;
2211 ssp->smk_in = current->security;
2212 ssp->smk_out = current->security;
2213 ssp->smk_packet[0] = '\0';
2214
2215 rc = smack_netlabel(sk);
2216}
2217
2218/**
2219 * smack_inet_conn_request - Smack access check on connect
2220 * @sk: socket involved
2221 * @skb: packet
2222 * @req: unused
2223 *
2224 * Returns 0 if a task with the packet label could write to
2225 * the socket, otherwise an error code
2226 */
2227static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
2228 struct request_sock *req)
2229{
2230 struct netlbl_lsm_secattr skb_secattr;
2231 struct socket_smack *ssp = sk->sk_security;
2232 char smack[SMK_LABELLEN];
2233 int rc;
2234
2235 if (skb == NULL)
2236 return -EACCES;
2237
2238 memset(smack, '\0', SMK_LABELLEN);
2239 netlbl_secattr_init(&skb_secattr);
2240 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
2241 if (rc == 0)
2242 smack_from_secattr(&skb_secattr, smack);
2243 else
2244 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
2245 netlbl_secattr_destroy(&skb_secattr);
2246 /*
2247 * Receiving a packet requires that the other end
2248 * be able to write here. Read access is not required.
2249 *
2250 * If the request is successful save the peer's label
2251 * so that SO_PEERCRED can report it.
2252 */
2253 rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
2254 if (rc == 0)
2255 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
2256
2257 return rc;
2258}
2259
2260/*
2261 * Key management security hooks
2262 *
2263 * Casey has not tested key support very heavily.
2264 * The permission check is most likely too restrictive.
2265 * If you care about keys please have a look.
2266 */
2267#ifdef CONFIG_KEYS
2268
2269/**
2270 * smack_key_alloc - Set the key security blob
2271 * @key: object
2272 * @tsk: the task associated with the key
2273 * @flags: unused
2274 *
2275 * No allocation required
2276 *
2277 * Returns 0
2278 */
2279static int smack_key_alloc(struct key *key, struct task_struct *tsk,
2280 unsigned long flags)
2281{
2282 key->security = tsk->security;
2283 return 0;
2284}
2285
2286/**
2287 * smack_key_free - Clear the key security blob
2288 * @key: the object
2289 *
2290 * Clear the blob pointer
2291 */
2292static void smack_key_free(struct key *key)
2293{
2294 key->security = NULL;
2295}
2296
2297/*
2298 * smack_key_permission - Smack access on a key
2299 * @key_ref: gets to the object
2300 * @context: task involved
2301 * @perm: unused
2302 *
2303 * Return 0 if the task has read and write to the object,
2304 * an error code otherwise
2305 */
2306static int smack_key_permission(key_ref_t key_ref,
2307 struct task_struct *context, key_perm_t perm)
2308{
2309 struct key *keyp;
2310
2311 keyp = key_ref_to_ptr(key_ref);
2312 if (keyp == NULL)
2313 return -EINVAL;
2314 /*
2315 * If the key hasn't been initialized give it access so that
2316 * it may do so.
2317 */
2318 if (keyp->security == NULL)
2319 return 0;
2320 /*
2321 * This should not occur
2322 */
2323 if (context->security == NULL)
2324 return -EACCES;
2325
2326 return smk_access(context->security, keyp->security, MAY_READWRITE);
2327}
2328#endif /* CONFIG_KEYS */
2329
2330/*
2331 * smack_secid_to_secctx - return the smack label for a secid
2332 * @secid: incoming integer
2333 * @secdata: destination
2334 * @seclen: how long it is
2335 *
2336 * Exists for networking code.
2337 */
2338static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
2339{
2340 char *sp = smack_from_secid(secid);
2341
2342 *secdata = sp;
2343 *seclen = strlen(sp);
2344 return 0;
2345}
2346
2347/*
2348 * smack_release_secctx - don't do anything.
2349 * @key_ref: unused
2350 * @context: unused
2351 * @perm: unused
2352 *
2353 * Exists to make sure nothing gets done, and properly
2354 */
2355static void smack_release_secctx(char *secdata, u32 seclen)
2356{
2357}
2358
2359static struct security_operations smack_ops = {
2360 .ptrace = smack_ptrace,
2361 .capget = cap_capget,
2362 .capset_check = cap_capset_check,
2363 .capset_set = cap_capset_set,
2364 .capable = cap_capable,
2365 .syslog = smack_syslog,
2366 .settime = cap_settime,
2367 .vm_enough_memory = cap_vm_enough_memory,
2368
2369 .bprm_apply_creds = cap_bprm_apply_creds,
2370 .bprm_set_security = cap_bprm_set_security,
2371 .bprm_secureexec = cap_bprm_secureexec,
2372
2373 .sb_alloc_security = smack_sb_alloc_security,
2374 .sb_free_security = smack_sb_free_security,
2375 .sb_copy_data = smack_sb_copy_data,
2376 .sb_kern_mount = smack_sb_kern_mount,
2377 .sb_statfs = smack_sb_statfs,
2378 .sb_mount = smack_sb_mount,
2379 .sb_umount = smack_sb_umount,
2380
2381 .inode_alloc_security = smack_inode_alloc_security,
2382 .inode_free_security = smack_inode_free_security,
2383 .inode_init_security = smack_inode_init_security,
2384 .inode_link = smack_inode_link,
2385 .inode_unlink = smack_inode_unlink,
2386 .inode_rmdir = smack_inode_rmdir,
2387 .inode_rename = smack_inode_rename,
2388 .inode_permission = smack_inode_permission,
2389 .inode_setattr = smack_inode_setattr,
2390 .inode_getattr = smack_inode_getattr,
2391 .inode_setxattr = smack_inode_setxattr,
2392 .inode_post_setxattr = smack_inode_post_setxattr,
2393 .inode_getxattr = smack_inode_getxattr,
2394 .inode_removexattr = smack_inode_removexattr,
2395 .inode_getsecurity = smack_inode_getsecurity,
2396 .inode_setsecurity = smack_inode_setsecurity,
2397 .inode_listsecurity = smack_inode_listsecurity,
2398
2399 .file_permission = smack_file_permission,
2400 .file_alloc_security = smack_file_alloc_security,
2401 .file_free_security = smack_file_free_security,
2402 .file_ioctl = smack_file_ioctl,
2403 .file_lock = smack_file_lock,
2404 .file_fcntl = smack_file_fcntl,
2405 .file_set_fowner = smack_file_set_fowner,
2406 .file_send_sigiotask = smack_file_send_sigiotask,
2407 .file_receive = smack_file_receive,
2408
2409 .task_alloc_security = smack_task_alloc_security,
2410 .task_free_security = smack_task_free_security,
2411 .task_post_setuid = cap_task_post_setuid,
2412 .task_setpgid = smack_task_setpgid,
2413 .task_getpgid = smack_task_getpgid,
2414 .task_getsid = smack_task_getsid,
2415 .task_getsecid = smack_task_getsecid,
2416 .task_setnice = smack_task_setnice,
2417 .task_setioprio = smack_task_setioprio,
2418 .task_getioprio = smack_task_getioprio,
2419 .task_setscheduler = smack_task_setscheduler,
2420 .task_getscheduler = smack_task_getscheduler,
2421 .task_movememory = smack_task_movememory,
2422 .task_kill = smack_task_kill,
2423 .task_wait = smack_task_wait,
2424 .task_reparent_to_init = cap_task_reparent_to_init,
2425 .task_to_inode = smack_task_to_inode,
2426
2427 .ipc_permission = smack_ipc_permission,
2428
2429 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
2430 .msg_msg_free_security = smack_msg_msg_free_security,
2431
2432 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
2433 .msg_queue_free_security = smack_msg_queue_free_security,
2434 .msg_queue_associate = smack_msg_queue_associate,
2435 .msg_queue_msgctl = smack_msg_queue_msgctl,
2436 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
2437 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
2438
2439 .shm_alloc_security = smack_shm_alloc_security,
2440 .shm_free_security = smack_shm_free_security,
2441 .shm_associate = smack_shm_associate,
2442 .shm_shmctl = smack_shm_shmctl,
2443 .shm_shmat = smack_shm_shmat,
2444
2445 .sem_alloc_security = smack_sem_alloc_security,
2446 .sem_free_security = smack_sem_free_security,
2447 .sem_associate = smack_sem_associate,
2448 .sem_semctl = smack_sem_semctl,
2449 .sem_semop = smack_sem_semop,
2450
2451 .netlink_send = cap_netlink_send,
2452 .netlink_recv = cap_netlink_recv,
2453
2454 .d_instantiate = smack_d_instantiate,
2455
2456 .getprocattr = smack_getprocattr,
2457 .setprocattr = smack_setprocattr,
2458
2459 .unix_stream_connect = smack_unix_stream_connect,
2460 .unix_may_send = smack_unix_may_send,
2461
2462 .socket_post_create = smack_socket_post_create,
2463 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
2464 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
2465 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
2466 .sk_alloc_security = smack_sk_alloc_security,
2467 .sk_free_security = smack_sk_free_security,
2468 .sock_graft = smack_sock_graft,
2469 .inet_conn_request = smack_inet_conn_request,
2470 /* key management security hooks */
2471#ifdef CONFIG_KEYS
2472 .key_alloc = smack_key_alloc,
2473 .key_free = smack_key_free,
2474 .key_permission = smack_key_permission,
2475#endif /* CONFIG_KEYS */
2476 .secid_to_secctx = smack_secid_to_secctx,
2477 .release_secctx = smack_release_secctx,
2478};
2479
2480/**
2481 * smack_init - initialize the smack system
2482 *
2483 * Returns 0
2484 */
2485static __init int smack_init(void)
2486{
2487 printk(KERN_INFO "Smack: Initializing.\n");
2488
2489 /*
2490 * Set the security state for the initial task.
2491 */
2492 current->security = &smack_known_floor.smk_known;
2493
2494 /*
2495 * Initialize locks
2496 */
2497 spin_lock_init(&smack_known_unset.smk_cipsolock);
2498 spin_lock_init(&smack_known_huh.smk_cipsolock);
2499 spin_lock_init(&smack_known_hat.smk_cipsolock);
2500 spin_lock_init(&smack_known_star.smk_cipsolock);
2501 spin_lock_init(&smack_known_floor.smk_cipsolock);
2502 spin_lock_init(&smack_known_invalid.smk_cipsolock);
2503
2504 /*
2505 * Register with LSM
2506 */
2507 if (register_security(&smack_ops))
2508 panic("smack: Unable to register with kernel.\n");
2509
2510 return 0;
2511}
2512
2513/*
2514 * Smack requires early initialization in order to label
2515 * all processes and objects when they are created.
2516 */
2517security_initcall(smack_init);
2518
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 04:56:51 -0500