2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
10 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
11 * Paul Moore <paul.moore@hp.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2,
15 * as published by the Free Software Foundation.
18 #include <linux/xattr.h>
19 #include <linux/pagemap.h>
20 #include <linux/mount.h>
21 #include <linux/stat.h>
23 #include <asm/ioctls.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/slab.h>
28 #include <linux/mutex.h>
29 #include <linux/pipe_fs_i.h>
30 #include <net/netlabel.h>
31 #include <net/cipso_ipv4.h>
32 #include <linux/audit.h>
33 #include <linux/magic.h>
36 #define task_security(task) (task_cred_xxx((task), security))
39 * smk_fetch - Fetch the smack label from a file.
40 * @ip: a pointer to the inode
41 * @dp: a pointer to the dentry
43 * Returns a pointer to the master list entry for the Smack label
44 * or NULL if there was no label to fetch.
46 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
49 char in
[SMK_LABELLEN
];
51 if (ip
->i_op
->getxattr
== NULL
)
54 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
58 return smk_import(in
, rc
);
62 * new_inode_smack - allocate an inode security blob
63 * @smack: a pointer to the Smack label to use in the blob
65 * Returns the new blob or NULL if there's no memory available
67 struct inode_smack
*new_inode_smack(char *smack
)
69 struct inode_smack
*isp
;
71 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
75 isp
->smk_inode
= smack
;
77 mutex_init(&isp
->smk_lock
);
88 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
89 * @ctp: child task pointer
90 * @mode: ptrace attachment mode
92 * Returns 0 if access is OK, an error code otherwise
94 * Do the capability checks, and require read and write.
96 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
99 struct smk_audit_info ad
;
102 rc
= cap_ptrace_access_check(ctp
, mode
);
106 sp
= current_security();
107 tsp
= task_security(ctp
);
108 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
109 smk_ad_setfield_u_tsk(&ad
, ctp
);
111 /* we won't log here, because rc can be overriden */
112 rc
= smk_access(sp
, tsp
, MAY_READWRITE
, NULL
);
113 if (rc
!= 0 && capable(CAP_MAC_OVERRIDE
))
116 smack_log(sp
, tsp
, MAY_READWRITE
, rc
, &ad
);
121 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
122 * @ptp: parent task pointer
124 * Returns 0 if access is OK, an error code otherwise
126 * Do the capability checks, and require read and write.
128 static int smack_ptrace_traceme(struct task_struct
*ptp
)
131 struct smk_audit_info ad
;
134 rc
= cap_ptrace_traceme(ptp
);
138 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
139 smk_ad_setfield_u_tsk(&ad
, ptp
);
141 sp
= current_security();
142 tsp
= task_security(ptp
);
143 /* we won't log here, because rc can be overriden */
144 rc
= smk_access(tsp
, sp
, MAY_READWRITE
, NULL
);
145 if (rc
!= 0 && has_capability(ptp
, CAP_MAC_OVERRIDE
))
148 smack_log(tsp
, sp
, MAY_READWRITE
, rc
, &ad
);
153 * smack_syslog - Smack approval on syslog
154 * @type: message type
156 * Require that the task has the floor label
158 * Returns 0 on success, error code otherwise.
160 static int smack_syslog(int type
, bool from_file
)
163 char *sp
= current_security();
165 rc
= cap_syslog(type
, from_file
);
169 if (capable(CAP_MAC_OVERRIDE
))
172 if (sp
!= smack_known_floor
.smk_known
)
184 * smack_sb_alloc_security - allocate a superblock blob
185 * @sb: the superblock getting the blob
187 * Returns 0 on success or -ENOMEM on error.
189 static int smack_sb_alloc_security(struct super_block
*sb
)
191 struct superblock_smack
*sbsp
;
193 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
198 sbsp
->smk_root
= smack_known_floor
.smk_known
;
199 sbsp
->smk_default
= smack_known_floor
.smk_known
;
200 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
201 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
202 sbsp
->smk_initialized
= 0;
203 spin_lock_init(&sbsp
->smk_sblock
);
205 sb
->s_security
= sbsp
;
211 * smack_sb_free_security - free a superblock blob
212 * @sb: the superblock getting the blob
215 static void smack_sb_free_security(struct super_block
*sb
)
217 kfree(sb
->s_security
);
218 sb
->s_security
= NULL
;
222 * smack_sb_copy_data - copy mount options data for processing
223 * @orig: where to start
224 * @smackopts: mount options string
226 * Returns 0 on success or -ENOMEM on error.
228 * Copy the Smack specific mount options out of the mount
231 static int smack_sb_copy_data(char *orig
, char *smackopts
)
233 char *cp
, *commap
, *otheropts
, *dp
;
235 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
236 if (otheropts
== NULL
)
239 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
240 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
242 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
244 else if (strstr(cp
, SMK_FSHAT
) == cp
)
246 else if (strstr(cp
, SMK_FSROOT
) == cp
)
251 commap
= strchr(cp
, ',');
260 strcpy(orig
, otheropts
);
261 free_page((unsigned long)otheropts
);
267 * smack_sb_kern_mount - Smack specific mount processing
268 * @sb: the file system superblock
269 * @flags: the mount flags
270 * @data: the smack mount options
272 * Returns 0 on success, an error code on failure
274 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
276 struct dentry
*root
= sb
->s_root
;
277 struct inode
*inode
= root
->d_inode
;
278 struct superblock_smack
*sp
= sb
->s_security
;
279 struct inode_smack
*isp
;
284 spin_lock(&sp
->smk_sblock
);
285 if (sp
->smk_initialized
!= 0) {
286 spin_unlock(&sp
->smk_sblock
);
289 sp
->smk_initialized
= 1;
290 spin_unlock(&sp
->smk_sblock
);
292 for (op
= data
; op
!= NULL
; op
= commap
) {
293 commap
= strchr(op
, ',');
297 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
298 op
+= strlen(SMK_FSHAT
);
299 nsp
= smk_import(op
, 0);
302 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
303 op
+= strlen(SMK_FSFLOOR
);
304 nsp
= smk_import(op
, 0);
307 } else if (strncmp(op
, SMK_FSDEFAULT
,
308 strlen(SMK_FSDEFAULT
)) == 0) {
309 op
+= strlen(SMK_FSDEFAULT
);
310 nsp
= smk_import(op
, 0);
312 sp
->smk_default
= nsp
;
313 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
314 op
+= strlen(SMK_FSROOT
);
315 nsp
= smk_import(op
, 0);
322 * Initialize the root inode.
324 isp
= inode
->i_security
;
326 inode
->i_security
= new_inode_smack(sp
->smk_root
);
328 isp
->smk_inode
= sp
->smk_root
;
334 * smack_sb_statfs - Smack check on statfs
335 * @dentry: identifies the file system in question
337 * Returns 0 if current can read the floor of the filesystem,
338 * and error code otherwise
340 static int smack_sb_statfs(struct dentry
*dentry
)
342 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
344 struct smk_audit_info ad
;
346 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
347 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
349 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
354 * smack_sb_mount - Smack check for mounting
361 * Returns 0 if current can write the floor of the filesystem
362 * being mounted on, an error code otherwise.
364 static int smack_sb_mount(char *dev_name
, struct path
*path
,
365 char *type
, unsigned long flags
, void *data
)
367 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
368 struct smk_audit_info ad
;
370 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
371 smk_ad_setfield_u_fs_path(&ad
, *path
);
373 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
377 * smack_sb_umount - Smack check for unmounting
378 * @mnt: file system to unmount
381 * Returns 0 if current can write the floor of the filesystem
382 * being unmounted, an error code otherwise.
384 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
386 struct superblock_smack
*sbp
;
387 struct smk_audit_info ad
;
389 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
390 smk_ad_setfield_u_fs_path_dentry(&ad
, mnt
->mnt_root
);
391 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
393 sbp
= mnt
->mnt_sb
->s_security
;
394 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
402 * smack_inode_alloc_security - allocate an inode blob
403 * @inode: the inode in need of a blob
405 * Returns 0 if it gets a blob, -ENOMEM otherwise
407 static int smack_inode_alloc_security(struct inode
*inode
)
409 inode
->i_security
= new_inode_smack(current_security());
410 if (inode
->i_security
== NULL
)
416 * smack_inode_free_security - free an inode blob
417 * @inode: the inode with a blob
419 * Clears the blob pointer in inode
421 static void smack_inode_free_security(struct inode
*inode
)
423 kfree(inode
->i_security
);
424 inode
->i_security
= NULL
;
428 * smack_inode_init_security - copy out the smack from an inode
431 * @name: where to put the attribute name
432 * @value: where to put the attribute value
433 * @len: where to put the length of the attribute
435 * Returns 0 if it all works out, -ENOMEM if there's no memory
437 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
438 char **name
, void **value
, size_t *len
)
440 char *isp
= smk_of_inode(inode
);
443 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
449 *value
= kstrdup(isp
, GFP_KERNEL
);
455 *len
= strlen(isp
) + 1;
461 * smack_inode_link - Smack check on link
462 * @old_dentry: the existing object
464 * @new_dentry: the new object
466 * Returns 0 if access is permitted, an error code otherwise
468 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
469 struct dentry
*new_dentry
)
472 struct smk_audit_info ad
;
475 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
476 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
478 isp
= smk_of_inode(old_dentry
->d_inode
);
479 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
481 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
482 isp
= smk_of_inode(new_dentry
->d_inode
);
483 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
484 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
491 * smack_inode_unlink - Smack check on inode deletion
492 * @dir: containing directory object
493 * @dentry: file to unlink
495 * Returns 0 if current can write the containing directory
496 * and the object, error code otherwise
498 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
500 struct inode
*ip
= dentry
->d_inode
;
501 struct smk_audit_info ad
;
504 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
505 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
508 * You need write access to the thing you're unlinking
510 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
513 * You also need write access to the containing directory
515 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
516 smk_ad_setfield_u_fs_inode(&ad
, dir
);
517 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
523 * smack_inode_rmdir - Smack check on directory deletion
524 * @dir: containing directory object
525 * @dentry: directory to unlink
527 * Returns 0 if current can write the containing directory
528 * and the directory, error code otherwise
530 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
532 struct smk_audit_info ad
;
535 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
536 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
539 * You need write access to the thing you're removing
541 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
544 * You also need write access to the containing directory
546 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
547 smk_ad_setfield_u_fs_inode(&ad
, dir
);
548 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
555 * smack_inode_rename - Smack check on rename
556 * @old_inode: the old directory
557 * @old_dentry: unused
558 * @new_inode: the new directory
559 * @new_dentry: unused
561 * Read and write access is required on both the old and
564 * Returns 0 if access is permitted, an error code otherwise
566 static int smack_inode_rename(struct inode
*old_inode
,
567 struct dentry
*old_dentry
,
568 struct inode
*new_inode
,
569 struct dentry
*new_dentry
)
573 struct smk_audit_info ad
;
575 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
576 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
578 isp
= smk_of_inode(old_dentry
->d_inode
);
579 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
581 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
582 isp
= smk_of_inode(new_dentry
->d_inode
);
583 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
584 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
590 * smack_inode_permission - Smack version of permission()
591 * @inode: the inode in question
592 * @mask: the access requested
594 * This is the important Smack hook.
596 * Returns 0 if access is permitted, -EACCES otherwise
598 static int smack_inode_permission(struct inode
*inode
, int mask
)
600 struct smk_audit_info ad
;
602 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
604 * No permission to check. Existence test. Yup, it's there.
608 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
609 smk_ad_setfield_u_fs_inode(&ad
, inode
);
610 return smk_curacc(smk_of_inode(inode
), mask
, &ad
);
614 * smack_inode_setattr - Smack check for setting attributes
615 * @dentry: the object
616 * @iattr: for the force flag
618 * Returns 0 if access is permitted, an error code otherwise
620 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
622 struct smk_audit_info ad
;
624 * Need to allow for clearing the setuid bit.
626 if (iattr
->ia_valid
& ATTR_FORCE
)
628 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
629 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
631 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
635 * smack_inode_getattr - Smack check for getting attributes
637 * @dentry: the object
639 * Returns 0 if access is permitted, an error code otherwise
641 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
643 struct smk_audit_info ad
;
645 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
646 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
647 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
648 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
652 * smack_inode_setxattr - Smack check for setting xattrs
653 * @dentry: the object
654 * @name: name of the attribute
659 * This protects the Smack attribute explicitly.
661 * Returns 0 if access is permitted, an error code otherwise
663 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
664 const void *value
, size_t size
, int flags
)
666 struct smk_audit_info ad
;
669 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
670 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
671 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
672 if (!capable(CAP_MAC_ADMIN
))
675 * check label validity here so import wont fail on
678 if (size
== 0 || size
>= SMK_LABELLEN
||
679 smk_import(value
, size
) == NULL
)
682 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
684 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
685 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
688 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
694 * smack_inode_post_setxattr - Apply the Smack update approved above
696 * @name: attribute name
697 * @value: attribute value
698 * @size: attribute size
701 * Set the pointer in the inode blob to the entry found
702 * in the master label list.
704 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
705 const void *value
, size_t size
, int flags
)
707 struct inode_smack
*isp
;
713 if (strcmp(name
, XATTR_NAME_SMACK
))
716 isp
= dentry
->d_inode
->i_security
;
719 * No locking is done here. This is a pointer
722 nsp
= smk_import(value
, size
);
724 isp
->smk_inode
= nsp
;
726 isp
->smk_inode
= smack_known_invalid
.smk_known
;
732 * smack_inode_getxattr - Smack check on getxattr
733 * @dentry: the object
736 * Returns 0 if access is permitted, an error code otherwise
738 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
740 struct smk_audit_info ad
;
742 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
743 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
745 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
749 * smack_inode_removexattr - Smack check on removexattr
750 * @dentry: the object
751 * @name: name of the attribute
753 * Removing the Smack attribute requires CAP_MAC_ADMIN
755 * Returns 0 if access is permitted, an error code otherwise
757 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
759 struct smk_audit_info ad
;
762 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
763 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
764 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
765 if (!capable(CAP_MAC_ADMIN
))
768 rc
= cap_inode_removexattr(dentry
, name
);
770 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
771 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
773 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
779 * smack_inode_getsecurity - get smack xattrs
781 * @name: attribute name
782 * @buffer: where to put the result
785 * Returns the size of the attribute or an error code
787 static int smack_inode_getsecurity(const struct inode
*inode
,
788 const char *name
, void **buffer
,
791 struct socket_smack
*ssp
;
793 struct super_block
*sbp
;
794 struct inode
*ip
= (struct inode
*)inode
;
799 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
800 isp
= smk_of_inode(inode
);
801 ilen
= strlen(isp
) + 1;
807 * The rest of the Smack xattrs are only on sockets.
810 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
814 if (sock
== NULL
|| sock
->sk
== NULL
)
817 ssp
= sock
->sk
->sk_security
;
819 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
821 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
826 ilen
= strlen(isp
) + 1;
837 * smack_inode_listsecurity - list the Smack attributes
839 * @buffer: where they go
840 * @buffer_size: size of buffer
842 * Returns 0 on success, -EINVAL otherwise
844 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
847 int len
= strlen(XATTR_NAME_SMACK
);
849 if (buffer
!= NULL
&& len
<= buffer_size
) {
850 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
857 * smack_inode_getsecid - Extract inode's security id
858 * @inode: inode to extract the info from
859 * @secid: where result will be saved
861 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
863 struct inode_smack
*isp
= inode
->i_security
;
865 *secid
= smack_to_secid(isp
->smk_inode
);
873 * smack_file_permission - Smack check on file operations
879 * Should access checks be done on each read or write?
880 * UNICOS and SELinux say yes.
881 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
883 * I'll say no for now. Smack does not do the frequent
884 * label changing that SELinux does.
886 static int smack_file_permission(struct file
*file
, int mask
)
892 * smack_file_alloc_security - assign a file security blob
895 * The security blob for a file is a pointer to the master
896 * label list, so no allocation is done.
900 static int smack_file_alloc_security(struct file
*file
)
902 file
->f_security
= current_security();
907 * smack_file_free_security - clear a file security blob
910 * The security blob for a file is a pointer to the master
911 * label list, so no memory is freed.
913 static void smack_file_free_security(struct file
*file
)
915 file
->f_security
= NULL
;
919 * smack_file_ioctl - Smack check on ioctls
924 * Relies heavily on the correct use of the ioctl command conventions.
926 * Returns 0 if allowed, error code otherwise
928 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
932 struct smk_audit_info ad
;
934 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
935 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
937 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
938 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
940 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
941 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
947 * smack_file_lock - Smack check on file locking
951 * Returns 0 if current has write access, error code otherwise
953 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
955 struct smk_audit_info ad
;
957 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
958 smk_ad_setfield_u_fs_path_dentry(&ad
, file
->f_path
.dentry
);
959 return smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
963 * smack_file_fcntl - Smack check on fcntl
965 * @cmd: what action to check
968 * Returns 0 if current has access, error code otherwise
970 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
973 struct smk_audit_info ad
;
976 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
977 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
986 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
994 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
997 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
, &ad
);
1004 * smack_file_set_fowner - set the file security blob value
1005 * @file: object in question
1008 * Further research may be required on this one.
1010 static int smack_file_set_fowner(struct file
*file
)
1012 file
->f_security
= current_security();
1017 * smack_file_send_sigiotask - Smack on sigio
1018 * @tsk: The target task
1019 * @fown: the object the signal come from
1022 * Allow a privileged task to get signals even if it shouldn't
1024 * Returns 0 if a subject with the object's smack could
1025 * write to the task, an error code otherwise.
1027 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1028 struct fown_struct
*fown
, int signum
)
1032 char *tsp
= tsk
->cred
->security
;
1033 struct smk_audit_info ad
;
1036 * struct fown_struct is never outside the context of a struct file
1038 file
= container_of(fown
, struct file
, f_owner
);
1039 /* we don't log here as rc can be overriden */
1040 rc
= smk_access(file
->f_security
, tsp
, MAY_WRITE
, NULL
);
1041 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1044 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1045 smk_ad_setfield_u_tsk(&ad
, tsk
);
1046 smack_log(file
->f_security
, tsp
, MAY_WRITE
, rc
, &ad
);
1051 * smack_file_receive - Smack file receive check
1054 * Returns 0 if current has access, error code otherwise
1056 static int smack_file_receive(struct file
*file
)
1059 struct smk_audit_info ad
;
1061 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1062 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1064 * This code relies on bitmasks.
1066 if (file
->f_mode
& FMODE_READ
)
1068 if (file
->f_mode
& FMODE_WRITE
)
1071 return smk_curacc(file
->f_security
, may
, &ad
);
1079 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1080 * @new: the new credentials
1081 * @gfp: the atomicity of any memory allocations
1083 * Prepare a blank set of credentials for modification. This must allocate all
1084 * the memory the LSM module might require such that cred_transfer() can
1085 * complete without error.
1087 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1089 cred
->security
= NULL
;
1095 * smack_cred_free - "free" task-level security credentials
1096 * @cred: the credentials in question
1098 * Smack isn't using copies of blobs. Everyone
1099 * points to an immutable list. The blobs never go away.
1100 * There is no leak here.
1102 static void smack_cred_free(struct cred
*cred
)
1104 cred
->security
= NULL
;
1108 * smack_cred_prepare - prepare new set of credentials for modification
1109 * @new: the new credentials
1110 * @old: the original credentials
1111 * @gfp: the atomicity of any memory allocations
1113 * Prepare a new set of credentials for modification.
1115 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1118 new->security
= old
->security
;
1123 * smack_cred_transfer - Transfer the old credentials to the new credentials
1124 * @new: the new credentials
1125 * @old: the original credentials
1127 * Fill in a set of blank credentials from another set of credentials.
1129 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1131 new->security
= old
->security
;
1135 * smack_kernel_act_as - Set the subjective context in a set of credentials
1136 * @new: points to the set of credentials to be modified.
1137 * @secid: specifies the security ID to be set
1139 * Set the security data for a kernel service.
1141 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1143 char *smack
= smack_from_secid(secid
);
1148 new->security
= smack
;
1153 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1154 * @new: points to the set of credentials to be modified
1155 * @inode: points to the inode to use as a reference
1157 * Set the file creation context in a set of credentials to the same
1158 * as the objective context of the specified inode
1160 static int smack_kernel_create_files_as(struct cred
*new,
1161 struct inode
*inode
)
1163 struct inode_smack
*isp
= inode
->i_security
;
1165 new->security
= isp
->smk_inode
;
1170 * smk_curacc_on_task - helper to log task related access
1171 * @p: the task object
1172 * @access : the access requested
1174 * Return 0 if access is permitted
1176 static int smk_curacc_on_task(struct task_struct
*p
, int access
)
1178 struct smk_audit_info ad
;
1180 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1181 smk_ad_setfield_u_tsk(&ad
, p
);
1182 return smk_curacc(task_security(p
), access
, &ad
);
1186 * smack_task_setpgid - Smack check on setting pgid
1187 * @p: the task object
1190 * Return 0 if write access is permitted
1192 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1194 return smk_curacc_on_task(p
, MAY_WRITE
);
1198 * smack_task_getpgid - Smack access check for getpgid
1199 * @p: the object task
1201 * Returns 0 if current can read the object task, error code otherwise
1203 static int smack_task_getpgid(struct task_struct
*p
)
1205 return smk_curacc_on_task(p
, MAY_READ
);
1209 * smack_task_getsid - Smack access check for getsid
1210 * @p: the object task
1212 * Returns 0 if current can read the object task, error code otherwise
1214 static int smack_task_getsid(struct task_struct
*p
)
1216 return smk_curacc_on_task(p
, MAY_READ
);
1220 * smack_task_getsecid - get the secid of the task
1221 * @p: the object task
1222 * @secid: where to put the result
1224 * Sets the secid to contain a u32 version of the smack label.
1226 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1228 *secid
= smack_to_secid(task_security(p
));
1232 * smack_task_setnice - Smack check on setting nice
1233 * @p: the task object
1236 * Return 0 if write access is permitted
1238 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1242 rc
= cap_task_setnice(p
, nice
);
1244 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1249 * smack_task_setioprio - Smack check on setting ioprio
1250 * @p: the task object
1253 * Return 0 if write access is permitted
1255 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1259 rc
= cap_task_setioprio(p
, ioprio
);
1261 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1266 * smack_task_getioprio - Smack check on reading ioprio
1267 * @p: the task object
1269 * Return 0 if read access is permitted
1271 static int smack_task_getioprio(struct task_struct
*p
)
1273 return smk_curacc_on_task(p
, MAY_READ
);
1277 * smack_task_setscheduler - Smack check on setting scheduler
1278 * @p: the task object
1282 * Return 0 if read access is permitted
1284 static int smack_task_setscheduler(struct task_struct
*p
)
1288 rc
= cap_task_setscheduler(p
);
1290 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1295 * smack_task_getscheduler - Smack check on reading scheduler
1296 * @p: the task object
1298 * Return 0 if read access is permitted
1300 static int smack_task_getscheduler(struct task_struct
*p
)
1302 return smk_curacc_on_task(p
, MAY_READ
);
1306 * smack_task_movememory - Smack check on moving memory
1307 * @p: the task object
1309 * Return 0 if write access is permitted
1311 static int smack_task_movememory(struct task_struct
*p
)
1313 return smk_curacc_on_task(p
, MAY_WRITE
);
1317 * smack_task_kill - Smack check on signal delivery
1318 * @p: the task object
1321 * @secid: identifies the smack to use in lieu of current's
1323 * Return 0 if write access is permitted
1325 * The secid behavior is an artifact of an SELinux hack
1326 * in the USB code. Someday it may go away.
1328 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1331 struct smk_audit_info ad
;
1333 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1334 smk_ad_setfield_u_tsk(&ad
, p
);
1336 * Sending a signal requires that the sender
1337 * can write the receiver.
1340 return smk_curacc(task_security(p
), MAY_WRITE
, &ad
);
1342 * If the secid isn't 0 we're dealing with some USB IO
1343 * specific behavior. This is not clean. For one thing
1344 * we can't take privilege into account.
1346 return smk_access(smack_from_secid(secid
), task_security(p
),
1351 * smack_task_wait - Smack access check for waiting
1352 * @p: task to wait for
1354 * Returns 0 if current can wait for p, error code otherwise
1356 static int smack_task_wait(struct task_struct
*p
)
1358 struct smk_audit_info ad
;
1359 char *sp
= current_security();
1360 char *tsp
= task_security(p
);
1363 /* we don't log here, we can be overriden */
1364 rc
= smk_access(sp
, tsp
, MAY_WRITE
, NULL
);
1369 * Allow the operation to succeed if either task
1370 * has privilege to perform operations that might
1371 * account for the smack labels having gotten to
1372 * be different in the first place.
1374 * This breaks the strict subject/object access
1375 * control ideal, taking the object's privilege
1376 * state into account in the decision as well as
1379 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1381 /* we log only if we didn't get overriden */
1383 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1384 smk_ad_setfield_u_tsk(&ad
, p
);
1385 smack_log(sp
, tsp
, MAY_WRITE
, rc
, &ad
);
1390 * smack_task_to_inode - copy task smack into the inode blob
1391 * @p: task to copy from
1392 * @inode: inode to copy to
1394 * Sets the smack pointer in the inode security blob
1396 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1398 struct inode_smack
*isp
= inode
->i_security
;
1399 isp
->smk_inode
= task_security(p
);
1407 * smack_sk_alloc_security - Allocate a socket blob
1410 * @gfp_flags: memory allocation flags
1412 * Assign Smack pointers to current
1414 * Returns 0 on success, -ENOMEM is there's no memory
1416 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1418 char *csp
= current_security();
1419 struct socket_smack
*ssp
;
1421 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1427 ssp
->smk_packet
[0] = '\0';
1429 sk
->sk_security
= ssp
;
1435 * smack_sk_free_security - Free a socket blob
1438 * Clears the blob pointer
1440 static void smack_sk_free_security(struct sock
*sk
)
1442 kfree(sk
->sk_security
);
1446 * smack_host_label - check host based restrictions
1447 * @sip: the object end
1449 * looks for host based access restrictions
1451 * This version will only be appropriate for really small sets of single label
1452 * hosts. The caller is responsible for ensuring that the RCU read lock is
1453 * taken before calling this function.
1455 * Returns the label of the far end or NULL if it's not special.
1457 static char *smack_host_label(struct sockaddr_in
*sip
)
1459 struct smk_netlbladdr
*snp
;
1460 struct in_addr
*siap
= &sip
->sin_addr
;
1462 if (siap
->s_addr
== 0)
1465 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
1467 * we break after finding the first match because
1468 * the list is sorted from longest to shortest mask
1469 * so we have found the most specific match
1471 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1472 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1473 /* we have found the special CIPSO option */
1474 if (snp
->smk_label
== smack_cipso_option
)
1476 return snp
->smk_label
;
1483 * smack_set_catset - convert a capset to netlabel mls categories
1484 * @catset: the Smack categories
1485 * @sap: where to put the netlabel categories
1487 * Allocates and fills attr.mls.cat
1489 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1500 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1501 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1502 sap
->attr
.mls
.cat
->startbit
= 0;
1504 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1505 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1508 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1514 * smack_to_secattr - fill a secattr from a smack value
1515 * @smack: the smack value
1516 * @nlsp: where the result goes
1518 * Casey says that CIPSO is good enough for now.
1519 * It can be used to effect.
1520 * It can also be abused to effect when necessary.
1521 * Appologies to the TSIG group in general and GW in particular.
1523 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1525 struct smack_cipso cipso
;
1528 nlsp
->domain
= smack
;
1529 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1531 rc
= smack_to_cipso(smack
, &cipso
);
1533 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1534 smack_set_catset(cipso
.smk_catset
, nlsp
);
1536 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1537 smack_set_catset(smack
, nlsp
);
1542 * smack_netlabel - Set the secattr on a socket
1544 * @labeled: socket label scheme
1546 * Convert the outbound smack value (smk_out) to a
1547 * secattr and attach it to the socket.
1549 * Returns 0 on success or an error code
1551 static int smack_netlabel(struct sock
*sk
, int labeled
)
1553 struct socket_smack
*ssp
= sk
->sk_security
;
1554 struct netlbl_lsm_secattr secattr
;
1558 * Usually the netlabel code will handle changing the
1559 * packet labeling based on the label.
1560 * The case of a single label host is different, because
1561 * a single label host should never get a labeled packet
1562 * even though the label is usually associated with a packet
1566 bh_lock_sock_nested(sk
);
1568 if (ssp
->smk_out
== smack_net_ambient
||
1569 labeled
== SMACK_UNLABELED_SOCKET
)
1570 netlbl_sock_delattr(sk
);
1572 netlbl_secattr_init(&secattr
);
1573 smack_to_secattr(ssp
->smk_out
, &secattr
);
1574 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &secattr
);
1575 netlbl_secattr_destroy(&secattr
);
1585 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1587 * @sap: the destination address
1589 * Set the correct secattr for the given socket based on the destination
1590 * address and perform any outbound access checks needed.
1592 * Returns 0 on success or an error code.
1595 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
1600 struct socket_smack
*ssp
= sk
->sk_security
;
1601 struct smk_audit_info ad
;
1604 hostsp
= smack_host_label(sap
);
1605 if (hostsp
!= NULL
) {
1606 sk_lbl
= SMACK_UNLABELED_SOCKET
;
1608 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
1609 ad
.a
.u
.net
.family
= sap
->sin_family
;
1610 ad
.a
.u
.net
.dport
= sap
->sin_port
;
1611 ad
.a
.u
.net
.v4info
.daddr
= sap
->sin_addr
.s_addr
;
1613 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
, &ad
);
1615 sk_lbl
= SMACK_CIPSO_SOCKET
;
1622 return smack_netlabel(sk
, sk_lbl
);
1626 * smack_inode_setsecurity - set smack xattrs
1627 * @inode: the object
1628 * @name: attribute name
1629 * @value: attribute value
1630 * @size: size of the attribute
1633 * Sets the named attribute in the appropriate blob
1635 * Returns 0 on success, or an error code
1637 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1638 const void *value
, size_t size
, int flags
)
1641 struct inode_smack
*nsp
= inode
->i_security
;
1642 struct socket_smack
*ssp
;
1643 struct socket
*sock
;
1646 if (value
== NULL
|| size
> SMK_LABELLEN
|| size
== 0)
1649 sp
= smk_import(value
, size
);
1653 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1654 nsp
->smk_inode
= sp
;
1655 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
1659 * The rest of the Smack xattrs are only on sockets.
1661 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1664 sock
= SOCKET_I(inode
);
1665 if (sock
== NULL
|| sock
->sk
== NULL
)
1668 ssp
= sock
->sk
->sk_security
;
1670 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1672 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1674 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1676 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1685 * smack_socket_post_create - finish socket setup
1687 * @family: protocol family
1692 * Sets the netlabel information on the socket
1694 * Returns 0 on success, and error code otherwise
1696 static int smack_socket_post_create(struct socket
*sock
, int family
,
1697 int type
, int protocol
, int kern
)
1699 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1702 * Set the outbound netlbl.
1704 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1708 * smack_socket_connect - connect access check
1710 * @sap: the other end
1711 * @addrlen: size of sap
1713 * Verifies that a connection may be possible
1715 * Returns 0 on success, and error code otherwise
1717 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
1720 if (sock
->sk
== NULL
|| sock
->sk
->sk_family
!= PF_INET
)
1722 if (addrlen
< sizeof(struct sockaddr_in
))
1725 return smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
1729 * smack_flags_to_may - convert S_ to MAY_ values
1730 * @flags: the S_ value
1732 * Returns the equivalent MAY_ value
1734 static int smack_flags_to_may(int flags
)
1738 if (flags
& S_IRUGO
)
1740 if (flags
& S_IWUGO
)
1742 if (flags
& S_IXUGO
)
1749 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1754 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1756 msg
->security
= current_security();
1761 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1764 * Clears the blob pointer
1766 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1768 msg
->security
= NULL
;
1772 * smack_of_shm - the smack pointer for the shm
1775 * Returns a pointer to the smack value
1777 static char *smack_of_shm(struct shmid_kernel
*shp
)
1779 return (char *)shp
->shm_perm
.security
;
1783 * smack_shm_alloc_security - Set the security blob for shm
1788 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1790 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1792 isp
->security
= current_security();
1797 * smack_shm_free_security - Clear the security blob for shm
1800 * Clears the blob pointer
1802 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1804 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1806 isp
->security
= NULL
;
1810 * smk_curacc_shm : check if current has access on shm
1812 * @access : access requested
1814 * Returns 0 if current has the requested access, error code otherwise
1816 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
1818 char *ssp
= smack_of_shm(shp
);
1819 struct smk_audit_info ad
;
1822 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
1823 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
1825 return smk_curacc(ssp
, access
, &ad
);
1829 * smack_shm_associate - Smack access check for shm
1831 * @shmflg: access requested
1833 * Returns 0 if current has the requested access, error code otherwise
1835 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1839 may
= smack_flags_to_may(shmflg
);
1840 return smk_curacc_shm(shp
, may
);
1844 * smack_shm_shmctl - Smack access check for shm
1846 * @cmd: what it wants to do
1848 * Returns 0 if current has the requested access, error code otherwise
1850 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1863 may
= MAY_READWRITE
;
1868 * System level information.
1874 return smk_curacc_shm(shp
, may
);
1878 * smack_shm_shmat - Smack access for shmat
1881 * @shmflg: access requested
1883 * Returns 0 if current has the requested access, error code otherwise
1885 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1890 may
= smack_flags_to_may(shmflg
);
1891 return smk_curacc_shm(shp
, may
);
1895 * smack_of_sem - the smack pointer for the sem
1898 * Returns a pointer to the smack value
1900 static char *smack_of_sem(struct sem_array
*sma
)
1902 return (char *)sma
->sem_perm
.security
;
1906 * smack_sem_alloc_security - Set the security blob for sem
1911 static int smack_sem_alloc_security(struct sem_array
*sma
)
1913 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1915 isp
->security
= current_security();
1920 * smack_sem_free_security - Clear the security blob for sem
1923 * Clears the blob pointer
1925 static void smack_sem_free_security(struct sem_array
*sma
)
1927 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1929 isp
->security
= NULL
;
1933 * smk_curacc_sem : check if current has access on sem
1935 * @access : access requested
1937 * Returns 0 if current has the requested access, error code otherwise
1939 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
1941 char *ssp
= smack_of_sem(sma
);
1942 struct smk_audit_info ad
;
1945 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
1946 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
1948 return smk_curacc(ssp
, access
, &ad
);
1952 * smack_sem_associate - Smack access check for sem
1954 * @semflg: access requested
1956 * Returns 0 if current has the requested access, error code otherwise
1958 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1962 may
= smack_flags_to_may(semflg
);
1963 return smk_curacc_sem(sma
, may
);
1967 * smack_sem_shmctl - Smack access check for sem
1969 * @cmd: what it wants to do
1971 * Returns 0 if current has the requested access, error code otherwise
1973 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1991 may
= MAY_READWRITE
;
1996 * System level information
2003 return smk_curacc_sem(sma
, may
);
2007 * smack_sem_semop - Smack checks of semaphore operations
2013 * Treated as read and write in all cases.
2015 * Returns 0 if access is allowed, error code otherwise
2017 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2018 unsigned nsops
, int alter
)
2020 return smk_curacc_sem(sma
, MAY_READWRITE
);
2024 * smack_msg_alloc_security - Set the security blob for msg
2029 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2031 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2033 kisp
->security
= current_security();
2038 * smack_msg_free_security - Clear the security blob for msg
2041 * Clears the blob pointer
2043 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2045 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2047 kisp
->security
= NULL
;
2051 * smack_of_msq - the smack pointer for the msq
2054 * Returns a pointer to the smack value
2056 static char *smack_of_msq(struct msg_queue
*msq
)
2058 return (char *)msq
->q_perm
.security
;
2062 * smk_curacc_msq : helper to check if current has access on msq
2064 * @access : access requested
2066 * return 0 if current has access, error otherwise
2068 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2070 char *msp
= smack_of_msq(msq
);
2071 struct smk_audit_info ad
;
2074 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2075 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2077 return smk_curacc(msp
, access
, &ad
);
2081 * smack_msg_queue_associate - Smack access check for msg_queue
2083 * @msqflg: access requested
2085 * Returns 0 if current has the requested access, error code otherwise
2087 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2091 may
= smack_flags_to_may(msqflg
);
2092 return smk_curacc_msq(msq
, may
);
2096 * smack_msg_queue_msgctl - Smack access check for msg_queue
2098 * @cmd: what it wants to do
2100 * Returns 0 if current has the requested access, error code otherwise
2102 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2113 may
= MAY_READWRITE
;
2118 * System level information
2125 return smk_curacc_msq(msq
, may
);
2129 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2132 * @msqflg: access requested
2134 * Returns 0 if current has the requested access, error code otherwise
2136 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2141 may
= smack_flags_to_may(msqflg
);
2142 return smk_curacc_msq(msq
, may
);
2146 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2153 * Returns 0 if current has read and write access, error code otherwise
2155 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2156 struct task_struct
*target
, long type
, int mode
)
2158 return smk_curacc_msq(msq
, MAY_READWRITE
);
2162 * smack_ipc_permission - Smack access for ipc_permission()
2163 * @ipp: the object permissions
2164 * @flag: access requested
2166 * Returns 0 if current has read and write access, error code otherwise
2168 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2170 char *isp
= ipp
->security
;
2171 int may
= smack_flags_to_may(flag
);
2172 struct smk_audit_info ad
;
2175 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2176 ad
.a
.u
.ipc_id
= ipp
->id
;
2178 return smk_curacc(isp
, may
, &ad
);
2182 * smack_ipc_getsecid - Extract smack security id
2183 * @ipp: the object permissions
2184 * @secid: where result will be saved
2186 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2188 char *smack
= ipp
->security
;
2190 *secid
= smack_to_secid(smack
);
2194 * smack_d_instantiate - Make sure the blob is correct on an inode
2195 * @opt_dentry: dentry where inode will be attached
2196 * @inode: the object
2198 * Set the inode's security blob if it hasn't been done already.
2200 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2202 struct super_block
*sbp
;
2203 struct superblock_smack
*sbsp
;
2204 struct inode_smack
*isp
;
2205 char *csp
= current_security();
2213 isp
= inode
->i_security
;
2215 mutex_lock(&isp
->smk_lock
);
2217 * If the inode is already instantiated
2218 * take the quick way out
2220 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2224 sbsp
= sbp
->s_security
;
2226 * We're going to use the superblock default label
2227 * if there's no label on the file.
2229 final
= sbsp
->smk_default
;
2232 * If this is the root inode the superblock
2233 * may be in the process of initialization.
2234 * If that is the case use the root value out
2235 * of the superblock.
2237 if (opt_dentry
->d_parent
== opt_dentry
) {
2238 isp
->smk_inode
= sbsp
->smk_root
;
2239 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2244 * This is pretty hackish.
2245 * Casey says that we shouldn't have to do
2246 * file system specific code, but it does help
2247 * with keeping it simple.
2249 switch (sbp
->s_magic
) {
2252 * Casey says that it's a little embarassing
2253 * that the smack file system doesn't do
2254 * extended attributes.
2256 final
= smack_known_star
.smk_known
;
2260 * Casey says pipes are easy (?)
2262 final
= smack_known_star
.smk_known
;
2264 case DEVPTS_SUPER_MAGIC
:
2266 * devpts seems content with the label of the task.
2267 * Programs that change smack have to treat the
2274 * Casey says sockets get the smack of the task.
2278 case PROC_SUPER_MAGIC
:
2280 * Casey says procfs appears not to care.
2281 * The superblock default suffices.
2286 * Device labels should come from the filesystem,
2287 * but watch out, because they're volitile,
2288 * getting recreated on every reboot.
2290 final
= smack_known_star
.smk_known
;
2294 * If a smack value has been set we want to use it,
2295 * but since tmpfs isn't giving us the opportunity
2296 * to set mount options simulate setting the
2297 * superblock default.
2301 * This isn't an understood special case.
2302 * Get the value from the xattr.
2304 * No xattr support means, alas, no SMACK label.
2305 * Use the aforeapplied default.
2306 * It would be curious if the label of the task
2307 * does not match that assigned.
2309 if (inode
->i_op
->getxattr
== NULL
)
2312 * Get the dentry for xattr.
2314 dp
= dget(opt_dentry
);
2315 fetched
= smk_fetch(inode
, dp
);
2316 if (fetched
!= NULL
)
2323 isp
->smk_inode
= csp
;
2325 isp
->smk_inode
= final
;
2327 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2330 mutex_unlock(&isp
->smk_lock
);
2335 * smack_getprocattr - Smack process attribute access
2336 * @p: the object task
2337 * @name: the name of the attribute in /proc/.../attr
2338 * @value: where to put the result
2340 * Places a copy of the task Smack into value
2342 * Returns the length of the smack label or an error code
2344 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2349 if (strcmp(name
, "current") != 0)
2352 cp
= kstrdup(task_security(p
), GFP_KERNEL
);
2362 * smack_setprocattr - Smack process attribute setting
2363 * @p: the object task
2364 * @name: the name of the attribute in /proc/.../attr
2365 * @value: the value to set
2366 * @size: the size of the value
2368 * Sets the Smack value of the task. Only setting self
2369 * is permitted and only with privilege
2371 * Returns the length of the smack label or an error code
2373 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2374 void *value
, size_t size
)
2380 * Changing another process' Smack value is too dangerous
2381 * and supports no sane use case.
2386 if (!capable(CAP_MAC_ADMIN
))
2389 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2392 if (strcmp(name
, "current") != 0)
2395 newsmack
= smk_import(value
, size
);
2396 if (newsmack
== NULL
)
2400 * No process is ever allowed the web ("@") label.
2402 if (newsmack
== smack_known_web
.smk_known
)
2405 new = prepare_creds();
2408 new->security
= newsmack
;
2414 * smack_unix_stream_connect - Smack access on UDS
2416 * @other: the other socket
2419 * Return 0 if a subject with the smack of sock could access
2420 * an object with the smack of other, otherwise an error code
2422 static int smack_unix_stream_connect(struct socket
*sock
,
2423 struct socket
*other
, struct sock
*newsk
)
2425 struct inode
*sp
= SOCK_INODE(sock
);
2426 struct inode
*op
= SOCK_INODE(other
);
2427 struct smk_audit_info ad
;
2429 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2430 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2431 return smk_access(smk_of_inode(sp
), smk_of_inode(op
),
2432 MAY_READWRITE
, &ad
);
2436 * smack_unix_may_send - Smack access on UDS
2438 * @other: the other socket
2440 * Return 0 if a subject with the smack of sock could access
2441 * an object with the smack of other, otherwise an error code
2443 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2445 struct inode
*sp
= SOCK_INODE(sock
);
2446 struct inode
*op
= SOCK_INODE(other
);
2447 struct smk_audit_info ad
;
2449 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2450 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2451 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
, &ad
);
2455 * smack_socket_sendmsg - Smack check based on destination host
2458 * @size: the size of the message
2460 * Return 0 if the current subject can write to the destination
2461 * host. This is only a question if the destination is a single
2464 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
2467 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
2470 * Perfectly reasonable for this to be NULL
2472 if (sip
== NULL
|| sip
->sin_family
!= AF_INET
)
2475 return smack_netlabel_send(sock
->sk
, sip
);
2480 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2481 * @sap: netlabel secattr
2482 * @sip: where to put the result
2484 * Copies a smack label into sip
2486 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2488 char smack
[SMK_LABELLEN
];
2492 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
2494 * Looks like a CIPSO packet.
2495 * If there are flags but no level netlabel isn't
2496 * behaving the way we expect it to.
2498 * Get the categories, if any
2499 * Without guidance regarding the smack value
2500 * for the packet fall back on the network
2503 memset(smack
, '\0', SMK_LABELLEN
);
2504 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2506 pcat
= netlbl_secattr_catmap_walk(
2507 sap
->attr
.mls
.cat
, pcat
+ 1);
2510 smack_catset_bit(pcat
, smack
);
2513 * If it is CIPSO using smack direct mapping
2514 * we are already done. WeeHee.
2516 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2517 memcpy(sip
, smack
, SMK_MAXLEN
);
2521 * Look it up in the supplied table if it is not
2524 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2527 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
2529 * Looks like a fallback, which gives us a secid.
2531 sp
= smack_from_secid(sap
->attr
.secid
);
2533 * This has got to be a bug because it is
2534 * impossible to specify a fallback without
2535 * specifying the label, which will ensure
2536 * it has a secid, and the only way to get a
2537 * secid is from a fallback.
2540 strncpy(sip
, sp
, SMK_MAXLEN
);
2544 * Without guidance regarding the smack value
2545 * for the packet fall back on the network
2548 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2553 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2557 * Returns 0 if the packet should be delivered, an error code otherwise
2559 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2561 struct netlbl_lsm_secattr secattr
;
2562 struct socket_smack
*ssp
= sk
->sk_security
;
2563 char smack
[SMK_LABELLEN
];
2566 struct smk_audit_info ad
;
2567 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2571 * Translate what netlabel gave us.
2573 netlbl_secattr_init(&secattr
);
2575 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2577 smack_from_secattr(&secattr
, smack
);
2580 csp
= smack_net_ambient
;
2582 netlbl_secattr_destroy(&secattr
);
2585 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2586 ad
.a
.u
.net
.family
= sk
->sk_family
;
2587 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
2588 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
2591 * Receiving a packet requires that the other end
2592 * be able to write here. Read access is not required.
2593 * This is the simplist possible security model
2596 rc
= smk_access(csp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
2598 netlbl_skbuff_err(skb
, rc
, 0);
2603 * smack_socket_getpeersec_stream - pull in packet label
2605 * @optval: user's destination
2606 * @optlen: size thereof
2609 * returns zero on success, an error code otherwise
2611 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2612 char __user
*optval
,
2613 int __user
*optlen
, unsigned len
)
2615 struct socket_smack
*ssp
;
2619 ssp
= sock
->sk
->sk_security
;
2620 slen
= strlen(ssp
->smk_packet
) + 1;
2624 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2627 if (put_user(slen
, optlen
) != 0)
2635 * smack_socket_getpeersec_dgram - pull in packet label
2638 * @secid: pointer to where to put the secid of the packet
2640 * Sets the netlabel socket state on sk from parent
2642 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2643 struct sk_buff
*skb
, u32
*secid
)
2646 struct netlbl_lsm_secattr secattr
;
2648 char smack
[SMK_LABELLEN
];
2649 int family
= PF_INET
;
2654 * Only works for families with packets.
2658 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2660 family
= sk
->sk_family
;
2663 * Translate what netlabel gave us.
2665 netlbl_secattr_init(&secattr
);
2666 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2668 smack_from_secattr(&secattr
, smack
);
2669 netlbl_secattr_destroy(&secattr
);
2672 * Give up if we couldn't get anything
2677 s
= smack_to_secid(smack
);
2686 * smack_sock_graft - Initialize a newly created socket with an existing sock
2688 * @parent: parent socket
2690 * Set the smk_{in,out} state of an existing sock based on the process that
2691 * is creating the new socket.
2693 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2695 struct socket_smack
*ssp
;
2698 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
2701 ssp
= sk
->sk_security
;
2702 ssp
->smk_in
= ssp
->smk_out
= current_security();
2703 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
2707 * smack_inet_conn_request - Smack access check on connect
2708 * @sk: socket involved
2712 * Returns 0 if a task with the packet label could write to
2713 * the socket, otherwise an error code
2715 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2716 struct request_sock
*req
)
2718 u16 family
= sk
->sk_family
;
2719 struct socket_smack
*ssp
= sk
->sk_security
;
2720 struct netlbl_lsm_secattr secattr
;
2721 struct sockaddr_in addr
;
2723 char smack
[SMK_LABELLEN
];
2725 struct smk_audit_info ad
;
2727 /* handle mapped IPv4 packets arriving via IPv6 sockets */
2728 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
2731 netlbl_secattr_init(&secattr
);
2732 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2734 smack_from_secattr(&secattr
, smack
);
2736 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2737 netlbl_secattr_destroy(&secattr
);
2740 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2741 ad
.a
.u
.net
.family
= family
;
2742 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
2743 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
2746 * Receiving a packet requires that the other end be able to write
2747 * here. Read access is not required.
2749 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
, &ad
);
2754 * Save the peer's label in the request_sock so we can later setup
2755 * smk_packet in the child socket so that SO_PEERCRED can report it.
2757 req
->peer_secid
= smack_to_secid(smack
);
2760 * We need to decide if we want to label the incoming connection here
2761 * if we do we only need to label the request_sock and the stack will
2762 * propogate the wire-label to the sock when it is created.
2765 addr
.sin_addr
.s_addr
= hdr
->saddr
;
2767 if (smack_host_label(&addr
) == NULL
) {
2769 netlbl_secattr_init(&secattr
);
2770 smack_to_secattr(smack
, &secattr
);
2771 rc
= netlbl_req_setattr(req
, &secattr
);
2772 netlbl_secattr_destroy(&secattr
);
2775 netlbl_req_delattr(req
);
2782 * smack_inet_csk_clone - Copy the connection information to the new socket
2783 * @sk: the new socket
2784 * @req: the connection's request_sock
2786 * Transfer the connection's peer label to the newly created socket.
2788 static void smack_inet_csk_clone(struct sock
*sk
,
2789 const struct request_sock
*req
)
2791 struct socket_smack
*ssp
= sk
->sk_security
;
2794 if (req
->peer_secid
!= 0) {
2795 smack
= smack_from_secid(req
->peer_secid
);
2796 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2798 ssp
->smk_packet
[0] = '\0';
2802 * Key management security hooks
2804 * Casey has not tested key support very heavily.
2805 * The permission check is most likely too restrictive.
2806 * If you care about keys please have a look.
2811 * smack_key_alloc - Set the key security blob
2813 * @cred: the credentials to use
2816 * No allocation required
2820 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
2821 unsigned long flags
)
2823 key
->security
= cred
->security
;
2828 * smack_key_free - Clear the key security blob
2831 * Clear the blob pointer
2833 static void smack_key_free(struct key
*key
)
2835 key
->security
= NULL
;
2839 * smack_key_permission - Smack access on a key
2840 * @key_ref: gets to the object
2841 * @cred: the credentials to use
2844 * Return 0 if the task has read and write to the object,
2845 * an error code otherwise
2847 static int smack_key_permission(key_ref_t key_ref
,
2848 const struct cred
*cred
, key_perm_t perm
)
2851 struct smk_audit_info ad
;
2853 keyp
= key_ref_to_ptr(key_ref
);
2857 * If the key hasn't been initialized give it access so that
2860 if (keyp
->security
== NULL
)
2863 * This should not occur
2865 if (cred
->security
== NULL
)
2868 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
2869 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
2870 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
2872 return smk_access(cred
->security
, keyp
->security
,
2873 MAY_READWRITE
, &ad
);
2875 #endif /* CONFIG_KEYS */
2880 * Audit requires a unique representation of each Smack specific
2881 * rule. This unique representation is used to distinguish the
2882 * object to be audited from remaining kernel objects and also
2883 * works as a glue between the audit hooks.
2885 * Since repository entries are added but never deleted, we'll use
2886 * the smack_known label address related to the given audit rule as
2887 * the needed unique representation. This also better fits the smack
2888 * model where nearly everything is a label.
2893 * smack_audit_rule_init - Initialize a smack audit rule
2894 * @field: audit rule fields given from user-space (audit.h)
2895 * @op: required testing operator (=, !=, >, <, ...)
2896 * @rulestr: smack label to be audited
2897 * @vrule: pointer to save our own audit rule representation
2899 * Prepare to audit cases where (@field @op @rulestr) is true.
2900 * The label to be audited is created if necessay.
2902 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2904 char **rule
= (char **)vrule
;
2907 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2910 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
2913 *rule
= smk_import(rulestr
, 0);
2919 * smack_audit_rule_known - Distinguish Smack audit rules
2920 * @krule: rule of interest, in Audit kernel representation format
2922 * This is used to filter Smack rules from remaining Audit ones.
2923 * If it's proved that this rule belongs to us, the
2924 * audit_rule_match hook will be called to do the final judgement.
2926 static int smack_audit_rule_known(struct audit_krule
*krule
)
2928 struct audit_field
*f
;
2931 for (i
= 0; i
< krule
->field_count
; i
++) {
2932 f
= &krule
->fields
[i
];
2934 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2942 * smack_audit_rule_match - Audit given object ?
2943 * @secid: security id for identifying the object to test
2944 * @field: audit rule flags given from user-space
2945 * @op: required testing operator
2946 * @vrule: smack internal rule presentation
2947 * @actx: audit context associated with the check
2949 * The core Audit hook. It's used to take the decision of
2950 * whether to audit or not to audit a given object.
2952 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2953 struct audit_context
*actx
)
2959 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2960 "Smack: missing rule\n");
2964 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2967 smack
= smack_from_secid(secid
);
2970 * No need to do string comparisons. If a match occurs,
2971 * both pointers will point to the same smack_known
2974 if (op
== Audit_equal
)
2975 return (rule
== smack
);
2976 if (op
== Audit_not_equal
)
2977 return (rule
!= smack
);
2983 * smack_audit_rule_free - free smack rule representation
2984 * @vrule: rule to be freed.
2986 * No memory was allocated.
2988 static void smack_audit_rule_free(void *vrule
)
2993 #endif /* CONFIG_AUDIT */
2996 * smack_secid_to_secctx - return the smack label for a secid
2997 * @secid: incoming integer
2998 * @secdata: destination
2999 * @seclen: how long it is
3001 * Exists for networking code.
3003 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3005 char *sp
= smack_from_secid(secid
);
3009 *seclen
= strlen(sp
);
3014 * smack_secctx_to_secid - return the secid for a smack label
3015 * @secdata: smack label
3016 * @seclen: how long result is
3017 * @secid: outgoing integer
3019 * Exists for audit and networking code.
3021 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3023 *secid
= smack_to_secid(secdata
);
3028 * smack_release_secctx - don't do anything.
3032 * Exists to make sure nothing gets done, and properly
3034 static void smack_release_secctx(char *secdata
, u32 seclen
)
3038 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3040 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
3043 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3045 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
3048 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
3051 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
3059 struct security_operations smack_ops
= {
3062 .ptrace_access_check
= smack_ptrace_access_check
,
3063 .ptrace_traceme
= smack_ptrace_traceme
,
3064 .syslog
= smack_syslog
,
3066 .sb_alloc_security
= smack_sb_alloc_security
,
3067 .sb_free_security
= smack_sb_free_security
,
3068 .sb_copy_data
= smack_sb_copy_data
,
3069 .sb_kern_mount
= smack_sb_kern_mount
,
3070 .sb_statfs
= smack_sb_statfs
,
3071 .sb_mount
= smack_sb_mount
,
3072 .sb_umount
= smack_sb_umount
,
3074 .inode_alloc_security
= smack_inode_alloc_security
,
3075 .inode_free_security
= smack_inode_free_security
,
3076 .inode_init_security
= smack_inode_init_security
,
3077 .inode_link
= smack_inode_link
,
3078 .inode_unlink
= smack_inode_unlink
,
3079 .inode_rmdir
= smack_inode_rmdir
,
3080 .inode_rename
= smack_inode_rename
,
3081 .inode_permission
= smack_inode_permission
,
3082 .inode_setattr
= smack_inode_setattr
,
3083 .inode_getattr
= smack_inode_getattr
,
3084 .inode_setxattr
= smack_inode_setxattr
,
3085 .inode_post_setxattr
= smack_inode_post_setxattr
,
3086 .inode_getxattr
= smack_inode_getxattr
,
3087 .inode_removexattr
= smack_inode_removexattr
,
3088 .inode_getsecurity
= smack_inode_getsecurity
,
3089 .inode_setsecurity
= smack_inode_setsecurity
,
3090 .inode_listsecurity
= smack_inode_listsecurity
,
3091 .inode_getsecid
= smack_inode_getsecid
,
3093 .file_permission
= smack_file_permission
,
3094 .file_alloc_security
= smack_file_alloc_security
,
3095 .file_free_security
= smack_file_free_security
,
3096 .file_ioctl
= smack_file_ioctl
,
3097 .file_lock
= smack_file_lock
,
3098 .file_fcntl
= smack_file_fcntl
,
3099 .file_set_fowner
= smack_file_set_fowner
,
3100 .file_send_sigiotask
= smack_file_send_sigiotask
,
3101 .file_receive
= smack_file_receive
,
3103 .cred_alloc_blank
= smack_cred_alloc_blank
,
3104 .cred_free
= smack_cred_free
,
3105 .cred_prepare
= smack_cred_prepare
,
3106 .cred_transfer
= smack_cred_transfer
,
3107 .kernel_act_as
= smack_kernel_act_as
,
3108 .kernel_create_files_as
= smack_kernel_create_files_as
,
3109 .task_setpgid
= smack_task_setpgid
,
3110 .task_getpgid
= smack_task_getpgid
,
3111 .task_getsid
= smack_task_getsid
,
3112 .task_getsecid
= smack_task_getsecid
,
3113 .task_setnice
= smack_task_setnice
,
3114 .task_setioprio
= smack_task_setioprio
,
3115 .task_getioprio
= smack_task_getioprio
,
3116 .task_setscheduler
= smack_task_setscheduler
,
3117 .task_getscheduler
= smack_task_getscheduler
,
3118 .task_movememory
= smack_task_movememory
,
3119 .task_kill
= smack_task_kill
,
3120 .task_wait
= smack_task_wait
,
3121 .task_to_inode
= smack_task_to_inode
,
3123 .ipc_permission
= smack_ipc_permission
,
3124 .ipc_getsecid
= smack_ipc_getsecid
,
3126 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
3127 .msg_msg_free_security
= smack_msg_msg_free_security
,
3129 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
3130 .msg_queue_free_security
= smack_msg_queue_free_security
,
3131 .msg_queue_associate
= smack_msg_queue_associate
,
3132 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
3133 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
3134 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
3136 .shm_alloc_security
= smack_shm_alloc_security
,
3137 .shm_free_security
= smack_shm_free_security
,
3138 .shm_associate
= smack_shm_associate
,
3139 .shm_shmctl
= smack_shm_shmctl
,
3140 .shm_shmat
= smack_shm_shmat
,
3142 .sem_alloc_security
= smack_sem_alloc_security
,
3143 .sem_free_security
= smack_sem_free_security
,
3144 .sem_associate
= smack_sem_associate
,
3145 .sem_semctl
= smack_sem_semctl
,
3146 .sem_semop
= smack_sem_semop
,
3148 .d_instantiate
= smack_d_instantiate
,
3150 .getprocattr
= smack_getprocattr
,
3151 .setprocattr
= smack_setprocattr
,
3153 .unix_stream_connect
= smack_unix_stream_connect
,
3154 .unix_may_send
= smack_unix_may_send
,
3156 .socket_post_create
= smack_socket_post_create
,
3157 .socket_connect
= smack_socket_connect
,
3158 .socket_sendmsg
= smack_socket_sendmsg
,
3159 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
3160 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
3161 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
3162 .sk_alloc_security
= smack_sk_alloc_security
,
3163 .sk_free_security
= smack_sk_free_security
,
3164 .sock_graft
= smack_sock_graft
,
3165 .inet_conn_request
= smack_inet_conn_request
,
3166 .inet_csk_clone
= smack_inet_csk_clone
,
3168 /* key management security hooks */
3170 .key_alloc
= smack_key_alloc
,
3171 .key_free
= smack_key_free
,
3172 .key_permission
= smack_key_permission
,
3173 #endif /* CONFIG_KEYS */
3177 .audit_rule_init
= smack_audit_rule_init
,
3178 .audit_rule_known
= smack_audit_rule_known
,
3179 .audit_rule_match
= smack_audit_rule_match
,
3180 .audit_rule_free
= smack_audit_rule_free
,
3181 #endif /* CONFIG_AUDIT */
3183 .secid_to_secctx
= smack_secid_to_secctx
,
3184 .secctx_to_secid
= smack_secctx_to_secid
,
3185 .release_secctx
= smack_release_secctx
,
3186 .inode_notifysecctx
= smack_inode_notifysecctx
,
3187 .inode_setsecctx
= smack_inode_setsecctx
,
3188 .inode_getsecctx
= smack_inode_getsecctx
,
3192 static __init
void init_smack_know_list(void)
3194 list_add(&smack_known_huh
.list
, &smack_known_list
);
3195 list_add(&smack_known_hat
.list
, &smack_known_list
);
3196 list_add(&smack_known_star
.list
, &smack_known_list
);
3197 list_add(&smack_known_floor
.list
, &smack_known_list
);
3198 list_add(&smack_known_invalid
.list
, &smack_known_list
);
3199 list_add(&smack_known_web
.list
, &smack_known_list
);
3203 * smack_init - initialize the smack system
3207 static __init
int smack_init(void)
3211 if (!security_module_enable(&smack_ops
))
3214 printk(KERN_INFO
"Smack: Initializing.\n");
3217 * Set the security state for the initial task.
3219 cred
= (struct cred
*) current
->cred
;
3220 cred
->security
= &smack_known_floor
.smk_known
;
3222 /* initialize the smack_know_list */
3223 init_smack_know_list();
3227 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
3228 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
3229 spin_lock_init(&smack_known_star
.smk_cipsolock
);
3230 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
3231 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
3236 if (register_security(&smack_ops
))
3237 panic("smack: Unable to register with kernel.\n");
3243 * Smack requires early initialization in order to label
3244 * all processes and objects when they are created.
3246 security_initcall(smack_init
);