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>
22 #include <linux/ext2_fs.h>
24 #include <asm/ioctls.h>
26 #include <linux/tcp.h>
27 #include <linux/udp.h>
28 #include <linux/slab.h>
29 #include <linux/mutex.h>
30 #include <linux/pipe_fs_i.h>
31 #include <net/netlabel.h>
32 #include <net/cipso_ipv4.h>
33 #include <linux/audit.h>
34 #include <linux/magic.h>
37 #define task_security(task) (task_cred_xxx((task), security))
40 * smk_fetch - Fetch the smack label from a file.
41 * @ip: a pointer to the inode
42 * @dp: a pointer to the dentry
44 * Returns a pointer to the master list entry for the Smack label
45 * or NULL if there was no label to fetch.
47 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
50 char in
[SMK_LABELLEN
];
52 if (ip
->i_op
->getxattr
== NULL
)
55 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
59 return smk_import(in
, rc
);
63 * new_inode_smack - allocate an inode security blob
64 * @smack: a pointer to the Smack label to use in the blob
66 * Returns the new blob or NULL if there's no memory available
68 struct inode_smack
*new_inode_smack(char *smack
)
70 struct inode_smack
*isp
;
72 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
76 isp
->smk_inode
= smack
;
78 mutex_init(&isp
->smk_lock
);
89 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
90 * @ctp: child task pointer
91 * @mode: ptrace attachment mode
93 * Returns 0 if access is OK, an error code otherwise
95 * Do the capability checks, and require read and write.
97 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
100 struct smk_audit_info ad
;
103 rc
= cap_ptrace_access_check(ctp
, mode
);
107 sp
= current_security();
108 tsp
= task_security(ctp
);
109 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
110 smk_ad_setfield_u_tsk(&ad
, ctp
);
112 /* we won't log here, because rc can be overriden */
113 rc
= smk_access(sp
, tsp
, MAY_READWRITE
, NULL
);
114 if (rc
!= 0 && capable(CAP_MAC_OVERRIDE
))
117 smack_log(sp
, tsp
, MAY_READWRITE
, rc
, &ad
);
122 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
123 * @ptp: parent task pointer
125 * Returns 0 if access is OK, an error code otherwise
127 * Do the capability checks, and require read and write.
129 static int smack_ptrace_traceme(struct task_struct
*ptp
)
132 struct smk_audit_info ad
;
135 rc
= cap_ptrace_traceme(ptp
);
139 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
140 smk_ad_setfield_u_tsk(&ad
, ptp
);
142 sp
= current_security();
143 tsp
= task_security(ptp
);
144 /* we won't log here, because rc can be overriden */
145 rc
= smk_access(tsp
, sp
, MAY_READWRITE
, NULL
);
146 if (rc
!= 0 && has_capability(ptp
, CAP_MAC_OVERRIDE
))
149 smack_log(tsp
, sp
, MAY_READWRITE
, rc
, &ad
);
154 * smack_syslog - Smack approval on syslog
155 * @type: message type
157 * Require that the task has the floor label
159 * Returns 0 on success, error code otherwise.
161 static int smack_syslog(int type
, bool from_file
)
164 char *sp
= current_security();
166 rc
= cap_syslog(type
, from_file
);
170 if (capable(CAP_MAC_OVERRIDE
))
173 if (sp
!= smack_known_floor
.smk_known
)
185 * smack_sb_alloc_security - allocate a superblock blob
186 * @sb: the superblock getting the blob
188 * Returns 0 on success or -ENOMEM on error.
190 static int smack_sb_alloc_security(struct super_block
*sb
)
192 struct superblock_smack
*sbsp
;
194 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
199 sbsp
->smk_root
= smack_known_floor
.smk_known
;
200 sbsp
->smk_default
= smack_known_floor
.smk_known
;
201 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
202 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
203 sbsp
->smk_initialized
= 0;
204 spin_lock_init(&sbsp
->smk_sblock
);
206 sb
->s_security
= sbsp
;
212 * smack_sb_free_security - free a superblock blob
213 * @sb: the superblock getting the blob
216 static void smack_sb_free_security(struct super_block
*sb
)
218 kfree(sb
->s_security
);
219 sb
->s_security
= NULL
;
223 * smack_sb_copy_data - copy mount options data for processing
224 * @orig: where to start
225 * @smackopts: mount options string
227 * Returns 0 on success or -ENOMEM on error.
229 * Copy the Smack specific mount options out of the mount
232 static int smack_sb_copy_data(char *orig
, char *smackopts
)
234 char *cp
, *commap
, *otheropts
, *dp
;
236 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
237 if (otheropts
== NULL
)
240 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
241 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
243 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
245 else if (strstr(cp
, SMK_FSHAT
) == cp
)
247 else if (strstr(cp
, SMK_FSROOT
) == cp
)
252 commap
= strchr(cp
, ',');
261 strcpy(orig
, otheropts
);
262 free_page((unsigned long)otheropts
);
268 * smack_sb_kern_mount - Smack specific mount processing
269 * @sb: the file system superblock
270 * @flags: the mount flags
271 * @data: the smack mount options
273 * Returns 0 on success, an error code on failure
275 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
277 struct dentry
*root
= sb
->s_root
;
278 struct inode
*inode
= root
->d_inode
;
279 struct superblock_smack
*sp
= sb
->s_security
;
280 struct inode_smack
*isp
;
285 spin_lock(&sp
->smk_sblock
);
286 if (sp
->smk_initialized
!= 0) {
287 spin_unlock(&sp
->smk_sblock
);
290 sp
->smk_initialized
= 1;
291 spin_unlock(&sp
->smk_sblock
);
293 for (op
= data
; op
!= NULL
; op
= commap
) {
294 commap
= strchr(op
, ',');
298 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
299 op
+= strlen(SMK_FSHAT
);
300 nsp
= smk_import(op
, 0);
303 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
304 op
+= strlen(SMK_FSFLOOR
);
305 nsp
= smk_import(op
, 0);
308 } else if (strncmp(op
, SMK_FSDEFAULT
,
309 strlen(SMK_FSDEFAULT
)) == 0) {
310 op
+= strlen(SMK_FSDEFAULT
);
311 nsp
= smk_import(op
, 0);
313 sp
->smk_default
= nsp
;
314 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
315 op
+= strlen(SMK_FSROOT
);
316 nsp
= smk_import(op
, 0);
323 * Initialize the root inode.
325 isp
= inode
->i_security
;
327 inode
->i_security
= new_inode_smack(sp
->smk_root
);
329 isp
->smk_inode
= sp
->smk_root
;
335 * smack_sb_statfs - Smack check on statfs
336 * @dentry: identifies the file system in question
338 * Returns 0 if current can read the floor of the filesystem,
339 * and error code otherwise
341 static int smack_sb_statfs(struct dentry
*dentry
)
343 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
345 struct smk_audit_info ad
;
347 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
348 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
350 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
355 * smack_sb_mount - Smack check for mounting
362 * Returns 0 if current can write the floor of the filesystem
363 * being mounted on, an error code otherwise.
365 static int smack_sb_mount(char *dev_name
, struct path
*path
,
366 char *type
, unsigned long flags
, void *data
)
368 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
369 struct smk_audit_info ad
;
371 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
372 smk_ad_setfield_u_fs_path(&ad
, *path
);
374 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
378 * smack_sb_umount - Smack check for unmounting
379 * @mnt: file system to unmount
382 * Returns 0 if current can write the floor of the filesystem
383 * being unmounted, an error code otherwise.
385 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
387 struct superblock_smack
*sbp
;
388 struct smk_audit_info ad
;
390 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
391 smk_ad_setfield_u_fs_path_dentry(&ad
, mnt
->mnt_root
);
392 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
394 sbp
= mnt
->mnt_sb
->s_security
;
395 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
403 * smack_inode_alloc_security - allocate an inode blob
404 * @inode: the inode in need of a blob
406 * Returns 0 if it gets a blob, -ENOMEM otherwise
408 static int smack_inode_alloc_security(struct inode
*inode
)
410 inode
->i_security
= new_inode_smack(current_security());
411 if (inode
->i_security
== NULL
)
417 * smack_inode_free_security - free an inode blob
418 * @inode: the inode with a blob
420 * Clears the blob pointer in inode
422 static void smack_inode_free_security(struct inode
*inode
)
424 kfree(inode
->i_security
);
425 inode
->i_security
= NULL
;
429 * smack_inode_init_security - copy out the smack from an inode
432 * @name: where to put the attribute name
433 * @value: where to put the attribute value
434 * @len: where to put the length of the attribute
436 * Returns 0 if it all works out, -ENOMEM if there's no memory
438 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
439 char **name
, void **value
, size_t *len
)
441 char *isp
= smk_of_inode(inode
);
444 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
450 *value
= kstrdup(isp
, GFP_KERNEL
);
456 *len
= strlen(isp
) + 1;
462 * smack_inode_link - Smack check on link
463 * @old_dentry: the existing object
465 * @new_dentry: the new object
467 * Returns 0 if access is permitted, an error code otherwise
469 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
470 struct dentry
*new_dentry
)
473 struct smk_audit_info ad
;
476 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
477 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
479 isp
= smk_of_inode(old_dentry
->d_inode
);
480 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
482 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
483 isp
= smk_of_inode(new_dentry
->d_inode
);
484 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
485 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
492 * smack_inode_unlink - Smack check on inode deletion
493 * @dir: containing directory object
494 * @dentry: file to unlink
496 * Returns 0 if current can write the containing directory
497 * and the object, error code otherwise
499 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
501 struct inode
*ip
= dentry
->d_inode
;
502 struct smk_audit_info ad
;
505 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
506 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
509 * You need write access to the thing you're unlinking
511 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
514 * You also need write access to the containing directory
516 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
517 smk_ad_setfield_u_fs_inode(&ad
, dir
);
518 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
524 * smack_inode_rmdir - Smack check on directory deletion
525 * @dir: containing directory object
526 * @dentry: directory to unlink
528 * Returns 0 if current can write the containing directory
529 * and the directory, error code otherwise
531 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
533 struct smk_audit_info ad
;
536 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
537 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
540 * You need write access to the thing you're removing
542 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
545 * You also need write access to the containing directory
547 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
548 smk_ad_setfield_u_fs_inode(&ad
, dir
);
549 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
556 * smack_inode_rename - Smack check on rename
557 * @old_inode: the old directory
558 * @old_dentry: unused
559 * @new_inode: the new directory
560 * @new_dentry: unused
562 * Read and write access is required on both the old and
565 * Returns 0 if access is permitted, an error code otherwise
567 static int smack_inode_rename(struct inode
*old_inode
,
568 struct dentry
*old_dentry
,
569 struct inode
*new_inode
,
570 struct dentry
*new_dentry
)
574 struct smk_audit_info ad
;
576 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
577 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
579 isp
= smk_of_inode(old_dentry
->d_inode
);
580 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
582 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
583 isp
= smk_of_inode(new_dentry
->d_inode
);
584 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
585 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
591 * smack_inode_permission - Smack version of permission()
592 * @inode: the inode in question
593 * @mask: the access requested
595 * This is the important Smack hook.
597 * Returns 0 if access is permitted, -EACCES otherwise
599 static int smack_inode_permission(struct inode
*inode
, int mask
)
601 struct smk_audit_info ad
;
603 * No permission to check. Existence test. Yup, it's there.
607 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
608 smk_ad_setfield_u_fs_inode(&ad
, inode
);
609 return smk_curacc(smk_of_inode(inode
), mask
, &ad
);
613 * smack_inode_setattr - Smack check for setting attributes
614 * @dentry: the object
615 * @iattr: for the force flag
617 * Returns 0 if access is permitted, an error code otherwise
619 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
621 struct smk_audit_info ad
;
623 * Need to allow for clearing the setuid bit.
625 if (iattr
->ia_valid
& ATTR_FORCE
)
627 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
628 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
630 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
634 * smack_inode_getattr - Smack check for getting attributes
636 * @dentry: the object
638 * Returns 0 if access is permitted, an error code otherwise
640 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
642 struct smk_audit_info ad
;
644 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
645 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
646 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
647 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
651 * smack_inode_setxattr - Smack check for setting xattrs
652 * @dentry: the object
653 * @name: name of the attribute
658 * This protects the Smack attribute explicitly.
660 * Returns 0 if access is permitted, an error code otherwise
662 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
663 const void *value
, size_t size
, int flags
)
665 struct smk_audit_info ad
;
668 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
669 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
670 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
671 if (!capable(CAP_MAC_ADMIN
))
674 * check label validity here so import wont fail on
677 if (size
== 0 || size
>= SMK_LABELLEN
||
678 smk_import(value
, size
) == NULL
)
681 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
683 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
684 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
687 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
693 * smack_inode_post_setxattr - Apply the Smack update approved above
695 * @name: attribute name
696 * @value: attribute value
697 * @size: attribute size
700 * Set the pointer in the inode blob to the entry found
701 * in the master label list.
703 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
704 const void *value
, size_t size
, int flags
)
706 struct inode_smack
*isp
;
712 if (strcmp(name
, XATTR_NAME_SMACK
))
715 isp
= dentry
->d_inode
->i_security
;
718 * No locking is done here. This is a pointer
721 nsp
= smk_import(value
, size
);
723 isp
->smk_inode
= nsp
;
725 isp
->smk_inode
= smack_known_invalid
.smk_known
;
731 * smack_inode_getxattr - Smack check on getxattr
732 * @dentry: the object
735 * Returns 0 if access is permitted, an error code otherwise
737 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
739 struct smk_audit_info ad
;
741 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
742 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
744 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
748 * smack_inode_removexattr - Smack check on removexattr
749 * @dentry: the object
750 * @name: name of the attribute
752 * Removing the Smack attribute requires CAP_MAC_ADMIN
754 * Returns 0 if access is permitted, an error code otherwise
756 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
758 struct smk_audit_info ad
;
761 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
762 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
763 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
764 if (!capable(CAP_MAC_ADMIN
))
767 rc
= cap_inode_removexattr(dentry
, name
);
769 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
770 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
772 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
778 * smack_inode_getsecurity - get smack xattrs
780 * @name: attribute name
781 * @buffer: where to put the result
784 * Returns the size of the attribute or an error code
786 static int smack_inode_getsecurity(const struct inode
*inode
,
787 const char *name
, void **buffer
,
790 struct socket_smack
*ssp
;
792 struct super_block
*sbp
;
793 struct inode
*ip
= (struct inode
*)inode
;
798 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
799 isp
= smk_of_inode(inode
);
800 ilen
= strlen(isp
) + 1;
806 * The rest of the Smack xattrs are only on sockets.
809 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
813 if (sock
== NULL
|| sock
->sk
== NULL
)
816 ssp
= sock
->sk
->sk_security
;
818 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
820 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
825 ilen
= strlen(isp
) + 1;
836 * smack_inode_listsecurity - list the Smack attributes
838 * @buffer: where they go
839 * @buffer_size: size of buffer
841 * Returns 0 on success, -EINVAL otherwise
843 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
846 int len
= strlen(XATTR_NAME_SMACK
);
848 if (buffer
!= NULL
&& len
<= buffer_size
) {
849 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
856 * smack_inode_getsecid - Extract inode's security id
857 * @inode: inode to extract the info from
858 * @secid: where result will be saved
860 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
862 struct inode_smack
*isp
= inode
->i_security
;
864 *secid
= smack_to_secid(isp
->smk_inode
);
872 * smack_file_permission - Smack check on file operations
878 * Should access checks be done on each read or write?
879 * UNICOS and SELinux say yes.
880 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
882 * I'll say no for now. Smack does not do the frequent
883 * label changing that SELinux does.
885 static int smack_file_permission(struct file
*file
, int mask
)
891 * smack_file_alloc_security - assign a file security blob
894 * The security blob for a file is a pointer to the master
895 * label list, so no allocation is done.
899 static int smack_file_alloc_security(struct file
*file
)
901 file
->f_security
= current_security();
906 * smack_file_free_security - clear a file security blob
909 * The security blob for a file is a pointer to the master
910 * label list, so no memory is freed.
912 static void smack_file_free_security(struct file
*file
)
914 file
->f_security
= NULL
;
918 * smack_file_ioctl - Smack check on ioctls
923 * Relies heavily on the correct use of the ioctl command conventions.
925 * Returns 0 if allowed, error code otherwise
927 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
931 struct smk_audit_info ad
;
933 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
934 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
936 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
937 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
939 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
940 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
946 * smack_file_lock - Smack check on file locking
950 * Returns 0 if current has write access, error code otherwise
952 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
954 struct smk_audit_info ad
;
956 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
957 smk_ad_setfield_u_fs_path_dentry(&ad
, file
->f_path
.dentry
);
958 return smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
962 * smack_file_fcntl - Smack check on fcntl
964 * @cmd: what action to check
967 * Returns 0 if current has access, error code otherwise
969 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
972 struct smk_audit_info ad
;
975 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
976 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
985 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
993 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
996 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
, &ad
);
1003 * smack_file_set_fowner - set the file security blob value
1004 * @file: object in question
1007 * Further research may be required on this one.
1009 static int smack_file_set_fowner(struct file
*file
)
1011 file
->f_security
= current_security();
1016 * smack_file_send_sigiotask - Smack on sigio
1017 * @tsk: The target task
1018 * @fown: the object the signal come from
1021 * Allow a privileged task to get signals even if it shouldn't
1023 * Returns 0 if a subject with the object's smack could
1024 * write to the task, an error code otherwise.
1026 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1027 struct fown_struct
*fown
, int signum
)
1031 char *tsp
= tsk
->cred
->security
;
1032 struct smk_audit_info ad
;
1035 * struct fown_struct is never outside the context of a struct file
1037 file
= container_of(fown
, struct file
, f_owner
);
1038 /* we don't log here as rc can be overriden */
1039 rc
= smk_access(file
->f_security
, tsp
, MAY_WRITE
, NULL
);
1040 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1043 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1044 smk_ad_setfield_u_tsk(&ad
, tsk
);
1045 smack_log(file
->f_security
, tsp
, MAY_WRITE
, rc
, &ad
);
1050 * smack_file_receive - Smack file receive check
1053 * Returns 0 if current has access, error code otherwise
1055 static int smack_file_receive(struct file
*file
)
1058 struct smk_audit_info ad
;
1060 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1061 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1063 * This code relies on bitmasks.
1065 if (file
->f_mode
& FMODE_READ
)
1067 if (file
->f_mode
& FMODE_WRITE
)
1070 return smk_curacc(file
->f_security
, may
, &ad
);
1078 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1079 * @new: the new credentials
1080 * @gfp: the atomicity of any memory allocations
1082 * Prepare a blank set of credentials for modification. This must allocate all
1083 * the memory the LSM module might require such that cred_transfer() can
1084 * complete without error.
1086 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1088 cred
->security
= NULL
;
1094 * smack_cred_free - "free" task-level security credentials
1095 * @cred: the credentials in question
1097 * Smack isn't using copies of blobs. Everyone
1098 * points to an immutable list. The blobs never go away.
1099 * There is no leak here.
1101 static void smack_cred_free(struct cred
*cred
)
1103 cred
->security
= NULL
;
1107 * smack_cred_prepare - prepare new set of credentials for modification
1108 * @new: the new credentials
1109 * @old: the original credentials
1110 * @gfp: the atomicity of any memory allocations
1112 * Prepare a new set of credentials for modification.
1114 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1117 new->security
= old
->security
;
1122 * smack_cred_commit - commit new credentials
1123 * @new: the new credentials
1124 * @old: the original credentials
1126 static void smack_cred_commit(struct cred
*new, const struct cred
*old
)
1131 * smack_cred_transfer - Transfer the old credentials to the new credentials
1132 * @new: the new credentials
1133 * @old: the original credentials
1135 * Fill in a set of blank credentials from another set of credentials.
1137 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1139 new->security
= old
->security
;
1143 * smack_kernel_act_as - Set the subjective context in a set of credentials
1144 * @new: points to the set of credentials to be modified.
1145 * @secid: specifies the security ID to be set
1147 * Set the security data for a kernel service.
1149 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1151 char *smack
= smack_from_secid(secid
);
1156 new->security
= smack
;
1161 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1162 * @new: points to the set of credentials to be modified
1163 * @inode: points to the inode to use as a reference
1165 * Set the file creation context in a set of credentials to the same
1166 * as the objective context of the specified inode
1168 static int smack_kernel_create_files_as(struct cred
*new,
1169 struct inode
*inode
)
1171 struct inode_smack
*isp
= inode
->i_security
;
1173 new->security
= isp
->smk_inode
;
1178 * smk_curacc_on_task - helper to log task related access
1179 * @p: the task object
1180 * @access : the access requested
1182 * Return 0 if access is permitted
1184 static int smk_curacc_on_task(struct task_struct
*p
, int access
)
1186 struct smk_audit_info ad
;
1188 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1189 smk_ad_setfield_u_tsk(&ad
, p
);
1190 return smk_curacc(task_security(p
), access
, &ad
);
1194 * smack_task_setpgid - Smack check on setting pgid
1195 * @p: the task object
1198 * Return 0 if write access is permitted
1200 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1202 return smk_curacc_on_task(p
, MAY_WRITE
);
1206 * smack_task_getpgid - Smack access check for getpgid
1207 * @p: the object task
1209 * Returns 0 if current can read the object task, error code otherwise
1211 static int smack_task_getpgid(struct task_struct
*p
)
1213 return smk_curacc_on_task(p
, MAY_READ
);
1217 * smack_task_getsid - Smack access check for getsid
1218 * @p: the object task
1220 * Returns 0 if current can read the object task, error code otherwise
1222 static int smack_task_getsid(struct task_struct
*p
)
1224 return smk_curacc_on_task(p
, MAY_READ
);
1228 * smack_task_getsecid - get the secid of the task
1229 * @p: the object task
1230 * @secid: where to put the result
1232 * Sets the secid to contain a u32 version of the smack label.
1234 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1236 *secid
= smack_to_secid(task_security(p
));
1240 * smack_task_setnice - Smack check on setting nice
1241 * @p: the task object
1244 * Return 0 if write access is permitted
1246 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1250 rc
= cap_task_setnice(p
, nice
);
1252 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1257 * smack_task_setioprio - Smack check on setting ioprio
1258 * @p: the task object
1261 * Return 0 if write access is permitted
1263 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1267 rc
= cap_task_setioprio(p
, ioprio
);
1269 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1274 * smack_task_getioprio - Smack check on reading ioprio
1275 * @p: the task object
1277 * Return 0 if read access is permitted
1279 static int smack_task_getioprio(struct task_struct
*p
)
1281 return smk_curacc_on_task(p
, MAY_READ
);
1285 * smack_task_setscheduler - Smack check on setting scheduler
1286 * @p: the task object
1290 * Return 0 if read access is permitted
1292 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1293 struct sched_param
*lp
)
1297 rc
= cap_task_setscheduler(p
, policy
, lp
);
1299 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1304 * smack_task_getscheduler - Smack check on reading scheduler
1305 * @p: the task object
1307 * Return 0 if read access is permitted
1309 static int smack_task_getscheduler(struct task_struct
*p
)
1311 return smk_curacc_on_task(p
, MAY_READ
);
1315 * smack_task_movememory - Smack check on moving memory
1316 * @p: the task object
1318 * Return 0 if write access is permitted
1320 static int smack_task_movememory(struct task_struct
*p
)
1322 return smk_curacc_on_task(p
, MAY_WRITE
);
1326 * smack_task_kill - Smack check on signal delivery
1327 * @p: the task object
1330 * @secid: identifies the smack to use in lieu of current's
1332 * Return 0 if write access is permitted
1334 * The secid behavior is an artifact of an SELinux hack
1335 * in the USB code. Someday it may go away.
1337 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1340 struct smk_audit_info ad
;
1342 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1343 smk_ad_setfield_u_tsk(&ad
, p
);
1345 * Sending a signal requires that the sender
1346 * can write the receiver.
1349 return smk_curacc(task_security(p
), MAY_WRITE
, &ad
);
1351 * If the secid isn't 0 we're dealing with some USB IO
1352 * specific behavior. This is not clean. For one thing
1353 * we can't take privilege into account.
1355 return smk_access(smack_from_secid(secid
), task_security(p
),
1360 * smack_task_wait - Smack access check for waiting
1361 * @p: task to wait for
1363 * Returns 0 if current can wait for p, error code otherwise
1365 static int smack_task_wait(struct task_struct
*p
)
1367 struct smk_audit_info ad
;
1368 char *sp
= current_security();
1369 char *tsp
= task_security(p
);
1372 /* we don't log here, we can be overriden */
1373 rc
= smk_access(sp
, tsp
, MAY_WRITE
, NULL
);
1378 * Allow the operation to succeed if either task
1379 * has privilege to perform operations that might
1380 * account for the smack labels having gotten to
1381 * be different in the first place.
1383 * This breaks the strict subject/object access
1384 * control ideal, taking the object's privilege
1385 * state into account in the decision as well as
1388 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1390 /* we log only if we didn't get overriden */
1392 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1393 smk_ad_setfield_u_tsk(&ad
, p
);
1394 smack_log(sp
, tsp
, MAY_WRITE
, rc
, &ad
);
1399 * smack_task_to_inode - copy task smack into the inode blob
1400 * @p: task to copy from
1401 * @inode: inode to copy to
1403 * Sets the smack pointer in the inode security blob
1405 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1407 struct inode_smack
*isp
= inode
->i_security
;
1408 isp
->smk_inode
= task_security(p
);
1416 * smack_sk_alloc_security - Allocate a socket blob
1419 * @gfp_flags: memory allocation flags
1421 * Assign Smack pointers to current
1423 * Returns 0 on success, -ENOMEM is there's no memory
1425 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1427 char *csp
= current_security();
1428 struct socket_smack
*ssp
;
1430 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1436 ssp
->smk_packet
[0] = '\0';
1438 sk
->sk_security
= ssp
;
1444 * smack_sk_free_security - Free a socket blob
1447 * Clears the blob pointer
1449 static void smack_sk_free_security(struct sock
*sk
)
1451 kfree(sk
->sk_security
);
1455 * smack_host_label - check host based restrictions
1456 * @sip: the object end
1458 * looks for host based access restrictions
1460 * This version will only be appropriate for really small sets of single label
1461 * hosts. The caller is responsible for ensuring that the RCU read lock is
1462 * taken before calling this function.
1464 * Returns the label of the far end or NULL if it's not special.
1466 static char *smack_host_label(struct sockaddr_in
*sip
)
1468 struct smk_netlbladdr
*snp
;
1469 struct in_addr
*siap
= &sip
->sin_addr
;
1471 if (siap
->s_addr
== 0)
1474 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
1476 * we break after finding the first match because
1477 * the list is sorted from longest to shortest mask
1478 * so we have found the most specific match
1480 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1481 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1482 /* we have found the special CIPSO option */
1483 if (snp
->smk_label
== smack_cipso_option
)
1485 return snp
->smk_label
;
1492 * smack_set_catset - convert a capset to netlabel mls categories
1493 * @catset: the Smack categories
1494 * @sap: where to put the netlabel categories
1496 * Allocates and fills attr.mls.cat
1498 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1509 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1510 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1511 sap
->attr
.mls
.cat
->startbit
= 0;
1513 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1514 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1517 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1523 * smack_to_secattr - fill a secattr from a smack value
1524 * @smack: the smack value
1525 * @nlsp: where the result goes
1527 * Casey says that CIPSO is good enough for now.
1528 * It can be used to effect.
1529 * It can also be abused to effect when necessary.
1530 * Appologies to the TSIG group in general and GW in particular.
1532 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1534 struct smack_cipso cipso
;
1537 nlsp
->domain
= smack
;
1538 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1540 rc
= smack_to_cipso(smack
, &cipso
);
1542 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1543 smack_set_catset(cipso
.smk_catset
, nlsp
);
1545 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1546 smack_set_catset(smack
, nlsp
);
1551 * smack_netlabel - Set the secattr on a socket
1553 * @labeled: socket label scheme
1555 * Convert the outbound smack value (smk_out) to a
1556 * secattr and attach it to the socket.
1558 * Returns 0 on success or an error code
1560 static int smack_netlabel(struct sock
*sk
, int labeled
)
1562 struct socket_smack
*ssp
= sk
->sk_security
;
1563 struct netlbl_lsm_secattr secattr
;
1567 * Usually the netlabel code will handle changing the
1568 * packet labeling based on the label.
1569 * The case of a single label host is different, because
1570 * a single label host should never get a labeled packet
1571 * even though the label is usually associated with a packet
1575 bh_lock_sock_nested(sk
);
1577 if (ssp
->smk_out
== smack_net_ambient
||
1578 labeled
== SMACK_UNLABELED_SOCKET
)
1579 netlbl_sock_delattr(sk
);
1581 netlbl_secattr_init(&secattr
);
1582 smack_to_secattr(ssp
->smk_out
, &secattr
);
1583 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &secattr
);
1584 netlbl_secattr_destroy(&secattr
);
1594 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1596 * @sap: the destination address
1598 * Set the correct secattr for the given socket based on the destination
1599 * address and perform any outbound access checks needed.
1601 * Returns 0 on success or an error code.
1604 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
1609 struct socket_smack
*ssp
= sk
->sk_security
;
1610 struct smk_audit_info ad
;
1613 hostsp
= smack_host_label(sap
);
1614 if (hostsp
!= NULL
) {
1615 sk_lbl
= SMACK_UNLABELED_SOCKET
;
1617 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
1618 ad
.a
.u
.net
.family
= sap
->sin_family
;
1619 ad
.a
.u
.net
.dport
= sap
->sin_port
;
1620 ad
.a
.u
.net
.v4info
.daddr
= sap
->sin_addr
.s_addr
;
1622 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
, &ad
);
1624 sk_lbl
= SMACK_CIPSO_SOCKET
;
1631 return smack_netlabel(sk
, sk_lbl
);
1635 * smack_inode_setsecurity - set smack xattrs
1636 * @inode: the object
1637 * @name: attribute name
1638 * @value: attribute value
1639 * @size: size of the attribute
1642 * Sets the named attribute in the appropriate blob
1644 * Returns 0 on success, or an error code
1646 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1647 const void *value
, size_t size
, int flags
)
1650 struct inode_smack
*nsp
= inode
->i_security
;
1651 struct socket_smack
*ssp
;
1652 struct socket
*sock
;
1655 if (value
== NULL
|| size
> SMK_LABELLEN
|| size
== 0)
1658 sp
= smk_import(value
, size
);
1662 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1663 nsp
->smk_inode
= sp
;
1664 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
1668 * The rest of the Smack xattrs are only on sockets.
1670 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1673 sock
= SOCKET_I(inode
);
1674 if (sock
== NULL
|| sock
->sk
== NULL
)
1677 ssp
= sock
->sk
->sk_security
;
1679 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1681 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1683 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1685 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1694 * smack_socket_post_create - finish socket setup
1696 * @family: protocol family
1701 * Sets the netlabel information on the socket
1703 * Returns 0 on success, and error code otherwise
1705 static int smack_socket_post_create(struct socket
*sock
, int family
,
1706 int type
, int protocol
, int kern
)
1708 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1711 * Set the outbound netlbl.
1713 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1717 * smack_socket_connect - connect access check
1719 * @sap: the other end
1720 * @addrlen: size of sap
1722 * Verifies that a connection may be possible
1724 * Returns 0 on success, and error code otherwise
1726 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
1729 if (sock
->sk
== NULL
|| sock
->sk
->sk_family
!= PF_INET
)
1731 if (addrlen
< sizeof(struct sockaddr_in
))
1734 return smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
1738 * smack_flags_to_may - convert S_ to MAY_ values
1739 * @flags: the S_ value
1741 * Returns the equivalent MAY_ value
1743 static int smack_flags_to_may(int flags
)
1747 if (flags
& S_IRUGO
)
1749 if (flags
& S_IWUGO
)
1751 if (flags
& S_IXUGO
)
1758 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1763 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1765 msg
->security
= current_security();
1770 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1773 * Clears the blob pointer
1775 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1777 msg
->security
= NULL
;
1781 * smack_of_shm - the smack pointer for the shm
1784 * Returns a pointer to the smack value
1786 static char *smack_of_shm(struct shmid_kernel
*shp
)
1788 return (char *)shp
->shm_perm
.security
;
1792 * smack_shm_alloc_security - Set the security blob for shm
1797 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1799 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1801 isp
->security
= current_security();
1806 * smack_shm_free_security - Clear the security blob for shm
1809 * Clears the blob pointer
1811 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1813 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1815 isp
->security
= NULL
;
1819 * smk_curacc_shm : check if current has access on shm
1821 * @access : access requested
1823 * Returns 0 if current has the requested access, error code otherwise
1825 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
1827 char *ssp
= smack_of_shm(shp
);
1828 struct smk_audit_info ad
;
1831 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
1832 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
1834 return smk_curacc(ssp
, access
, &ad
);
1838 * smack_shm_associate - Smack access check for shm
1840 * @shmflg: access requested
1842 * Returns 0 if current has the requested access, error code otherwise
1844 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1848 may
= smack_flags_to_may(shmflg
);
1849 return smk_curacc_shm(shp
, may
);
1853 * smack_shm_shmctl - Smack access check for shm
1855 * @cmd: what it wants to do
1857 * Returns 0 if current has the requested access, error code otherwise
1859 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1872 may
= MAY_READWRITE
;
1877 * System level information.
1883 return smk_curacc_shm(shp
, may
);
1887 * smack_shm_shmat - Smack access for shmat
1890 * @shmflg: access requested
1892 * Returns 0 if current has the requested access, error code otherwise
1894 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1899 may
= smack_flags_to_may(shmflg
);
1900 return smk_curacc_shm(shp
, may
);
1904 * smack_of_sem - the smack pointer for the sem
1907 * Returns a pointer to the smack value
1909 static char *smack_of_sem(struct sem_array
*sma
)
1911 return (char *)sma
->sem_perm
.security
;
1915 * smack_sem_alloc_security - Set the security blob for sem
1920 static int smack_sem_alloc_security(struct sem_array
*sma
)
1922 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1924 isp
->security
= current_security();
1929 * smack_sem_free_security - Clear the security blob for sem
1932 * Clears the blob pointer
1934 static void smack_sem_free_security(struct sem_array
*sma
)
1936 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1938 isp
->security
= NULL
;
1942 * smk_curacc_sem : check if current has access on sem
1944 * @access : access requested
1946 * Returns 0 if current has the requested access, error code otherwise
1948 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
1950 char *ssp
= smack_of_sem(sma
);
1951 struct smk_audit_info ad
;
1954 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
1955 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
1957 return smk_curacc(ssp
, access
, &ad
);
1961 * smack_sem_associate - Smack access check for sem
1963 * @semflg: access requested
1965 * Returns 0 if current has the requested access, error code otherwise
1967 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1971 may
= smack_flags_to_may(semflg
);
1972 return smk_curacc_sem(sma
, may
);
1976 * smack_sem_shmctl - Smack access check for sem
1978 * @cmd: what it wants to do
1980 * Returns 0 if current has the requested access, error code otherwise
1982 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2000 may
= MAY_READWRITE
;
2005 * System level information
2012 return smk_curacc_sem(sma
, may
);
2016 * smack_sem_semop - Smack checks of semaphore operations
2022 * Treated as read and write in all cases.
2024 * Returns 0 if access is allowed, error code otherwise
2026 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2027 unsigned nsops
, int alter
)
2029 return smk_curacc_sem(sma
, MAY_READWRITE
);
2033 * smack_msg_alloc_security - Set the security blob for msg
2038 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2040 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2042 kisp
->security
= current_security();
2047 * smack_msg_free_security - Clear the security blob for msg
2050 * Clears the blob pointer
2052 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2054 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2056 kisp
->security
= NULL
;
2060 * smack_of_msq - the smack pointer for the msq
2063 * Returns a pointer to the smack value
2065 static char *smack_of_msq(struct msg_queue
*msq
)
2067 return (char *)msq
->q_perm
.security
;
2071 * smk_curacc_msq : helper to check if current has access on msq
2073 * @access : access requested
2075 * return 0 if current has access, error otherwise
2077 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2079 char *msp
= smack_of_msq(msq
);
2080 struct smk_audit_info ad
;
2083 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2084 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2086 return smk_curacc(msp
, access
, &ad
);
2090 * smack_msg_queue_associate - Smack access check for msg_queue
2092 * @msqflg: access requested
2094 * Returns 0 if current has the requested access, error code otherwise
2096 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2100 may
= smack_flags_to_may(msqflg
);
2101 return smk_curacc_msq(msq
, may
);
2105 * smack_msg_queue_msgctl - Smack access check for msg_queue
2107 * @cmd: what it wants to do
2109 * Returns 0 if current has the requested access, error code otherwise
2111 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2122 may
= MAY_READWRITE
;
2127 * System level information
2134 return smk_curacc_msq(msq
, may
);
2138 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2141 * @msqflg: access requested
2143 * Returns 0 if current has the requested access, error code otherwise
2145 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2150 may
= smack_flags_to_may(msqflg
);
2151 return smk_curacc_msq(msq
, may
);
2155 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2162 * Returns 0 if current has read and write access, error code otherwise
2164 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2165 struct task_struct
*target
, long type
, int mode
)
2167 return smk_curacc_msq(msq
, MAY_READWRITE
);
2171 * smack_ipc_permission - Smack access for ipc_permission()
2172 * @ipp: the object permissions
2173 * @flag: access requested
2175 * Returns 0 if current has read and write access, error code otherwise
2177 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2179 char *isp
= ipp
->security
;
2180 int may
= smack_flags_to_may(flag
);
2181 struct smk_audit_info ad
;
2184 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2185 ad
.a
.u
.ipc_id
= ipp
->id
;
2187 return smk_curacc(isp
, may
, &ad
);
2191 * smack_ipc_getsecid - Extract smack security id
2192 * @ipp: the object permissions
2193 * @secid: where result will be saved
2195 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2197 char *smack
= ipp
->security
;
2199 *secid
= smack_to_secid(smack
);
2203 * smack_d_instantiate - Make sure the blob is correct on an inode
2204 * @opt_dentry: unused
2205 * @inode: the object
2207 * Set the inode's security blob if it hasn't been done already.
2209 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2211 struct super_block
*sbp
;
2212 struct superblock_smack
*sbsp
;
2213 struct inode_smack
*isp
;
2214 char *csp
= current_security();
2222 isp
= inode
->i_security
;
2224 mutex_lock(&isp
->smk_lock
);
2226 * If the inode is already instantiated
2227 * take the quick way out
2229 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2233 sbsp
= sbp
->s_security
;
2235 * We're going to use the superblock default label
2236 * if there's no label on the file.
2238 final
= sbsp
->smk_default
;
2241 * If this is the root inode the superblock
2242 * may be in the process of initialization.
2243 * If that is the case use the root value out
2244 * of the superblock.
2246 if (opt_dentry
->d_parent
== opt_dentry
) {
2247 isp
->smk_inode
= sbsp
->smk_root
;
2248 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2253 * This is pretty hackish.
2254 * Casey says that we shouldn't have to do
2255 * file system specific code, but it does help
2256 * with keeping it simple.
2258 switch (sbp
->s_magic
) {
2261 * Casey says that it's a little embarassing
2262 * that the smack file system doesn't do
2263 * extended attributes.
2265 final
= smack_known_star
.smk_known
;
2269 * Casey says pipes are easy (?)
2271 final
= smack_known_star
.smk_known
;
2273 case DEVPTS_SUPER_MAGIC
:
2275 * devpts seems content with the label of the task.
2276 * Programs that change smack have to treat the
2283 * Casey says sockets get the smack of the task.
2287 case PROC_SUPER_MAGIC
:
2289 * Casey says procfs appears not to care.
2290 * The superblock default suffices.
2295 * Device labels should come from the filesystem,
2296 * but watch out, because they're volitile,
2297 * getting recreated on every reboot.
2299 final
= smack_known_star
.smk_known
;
2303 * If a smack value has been set we want to use it,
2304 * but since tmpfs isn't giving us the opportunity
2305 * to set mount options simulate setting the
2306 * superblock default.
2310 * This isn't an understood special case.
2311 * Get the value from the xattr.
2313 * No xattr support means, alas, no SMACK label.
2314 * Use the aforeapplied default.
2315 * It would be curious if the label of the task
2316 * does not match that assigned.
2318 if (inode
->i_op
->getxattr
== NULL
)
2321 * Get the dentry for xattr.
2323 if (opt_dentry
== NULL
) {
2324 dp
= d_find_alias(inode
);
2328 dp
= dget(opt_dentry
);
2333 fetched
= smk_fetch(inode
, dp
);
2334 if (fetched
!= NULL
)
2342 isp
->smk_inode
= csp
;
2344 isp
->smk_inode
= final
;
2346 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2349 mutex_unlock(&isp
->smk_lock
);
2354 * smack_getprocattr - Smack process attribute access
2355 * @p: the object task
2356 * @name: the name of the attribute in /proc/.../attr
2357 * @value: where to put the result
2359 * Places a copy of the task Smack into value
2361 * Returns the length of the smack label or an error code
2363 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2368 if (strcmp(name
, "current") != 0)
2371 cp
= kstrdup(task_security(p
), GFP_KERNEL
);
2381 * smack_setprocattr - Smack process attribute setting
2382 * @p: the object task
2383 * @name: the name of the attribute in /proc/.../attr
2384 * @value: the value to set
2385 * @size: the size of the value
2387 * Sets the Smack value of the task. Only setting self
2388 * is permitted and only with privilege
2390 * Returns the length of the smack label or an error code
2392 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2393 void *value
, size_t size
)
2399 * Changing another process' Smack value is too dangerous
2400 * and supports no sane use case.
2405 if (!capable(CAP_MAC_ADMIN
))
2408 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2411 if (strcmp(name
, "current") != 0)
2414 newsmack
= smk_import(value
, size
);
2415 if (newsmack
== NULL
)
2419 * No process is ever allowed the web ("@") label.
2421 if (newsmack
== smack_known_web
.smk_known
)
2424 new = prepare_creds();
2427 new->security
= newsmack
;
2433 * smack_unix_stream_connect - Smack access on UDS
2435 * @other: the other socket
2438 * Return 0 if a subject with the smack of sock could access
2439 * an object with the smack of other, otherwise an error code
2441 static int smack_unix_stream_connect(struct socket
*sock
,
2442 struct socket
*other
, struct sock
*newsk
)
2444 struct inode
*sp
= SOCK_INODE(sock
);
2445 struct inode
*op
= SOCK_INODE(other
);
2446 struct smk_audit_info ad
;
2448 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2449 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2450 return smk_access(smk_of_inode(sp
), smk_of_inode(op
),
2451 MAY_READWRITE
, &ad
);
2455 * smack_unix_may_send - Smack access on UDS
2457 * @other: the other socket
2459 * Return 0 if a subject with the smack of sock could access
2460 * an object with the smack of other, otherwise an error code
2462 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2464 struct inode
*sp
= SOCK_INODE(sock
);
2465 struct inode
*op
= SOCK_INODE(other
);
2466 struct smk_audit_info ad
;
2468 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2469 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2470 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
, &ad
);
2474 * smack_socket_sendmsg - Smack check based on destination host
2477 * @size: the size of the message
2479 * Return 0 if the current subject can write to the destination
2480 * host. This is only a question if the destination is a single
2483 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
2486 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
2489 * Perfectly reasonable for this to be NULL
2491 if (sip
== NULL
|| sip
->sin_family
!= AF_INET
)
2494 return smack_netlabel_send(sock
->sk
, sip
);
2499 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2500 * @sap: netlabel secattr
2501 * @sip: where to put the result
2503 * Copies a smack label into sip
2505 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2507 char smack
[SMK_LABELLEN
];
2511 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
2513 * Looks like a CIPSO packet.
2514 * If there are flags but no level netlabel isn't
2515 * behaving the way we expect it to.
2517 * Get the categories, if any
2518 * Without guidance regarding the smack value
2519 * for the packet fall back on the network
2522 memset(smack
, '\0', SMK_LABELLEN
);
2523 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2525 pcat
= netlbl_secattr_catmap_walk(
2526 sap
->attr
.mls
.cat
, pcat
+ 1);
2529 smack_catset_bit(pcat
, smack
);
2532 * If it is CIPSO using smack direct mapping
2533 * we are already done. WeeHee.
2535 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2536 memcpy(sip
, smack
, SMK_MAXLEN
);
2540 * Look it up in the supplied table if it is not
2543 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2546 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
2548 * Looks like a fallback, which gives us a secid.
2550 sp
= smack_from_secid(sap
->attr
.secid
);
2552 * This has got to be a bug because it is
2553 * impossible to specify a fallback without
2554 * specifying the label, which will ensure
2555 * it has a secid, and the only way to get a
2556 * secid is from a fallback.
2559 strncpy(sip
, sp
, SMK_MAXLEN
);
2563 * Without guidance regarding the smack value
2564 * for the packet fall back on the network
2567 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2572 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2576 * Returns 0 if the packet should be delivered, an error code otherwise
2578 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2580 struct netlbl_lsm_secattr secattr
;
2581 struct socket_smack
*ssp
= sk
->sk_security
;
2582 char smack
[SMK_LABELLEN
];
2585 struct smk_audit_info ad
;
2586 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2590 * Translate what netlabel gave us.
2592 netlbl_secattr_init(&secattr
);
2594 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2596 smack_from_secattr(&secattr
, smack
);
2599 csp
= smack_net_ambient
;
2601 netlbl_secattr_destroy(&secattr
);
2604 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2605 ad
.a
.u
.net
.family
= sk
->sk_family
;
2606 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
2607 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
2610 * Receiving a packet requires that the other end
2611 * be able to write here. Read access is not required.
2612 * This is the simplist possible security model
2615 rc
= smk_access(csp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
2617 netlbl_skbuff_err(skb
, rc
, 0);
2622 * smack_socket_getpeersec_stream - pull in packet label
2624 * @optval: user's destination
2625 * @optlen: size thereof
2628 * returns zero on success, an error code otherwise
2630 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2631 char __user
*optval
,
2632 int __user
*optlen
, unsigned len
)
2634 struct socket_smack
*ssp
;
2638 ssp
= sock
->sk
->sk_security
;
2639 slen
= strlen(ssp
->smk_packet
) + 1;
2643 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2646 if (put_user(slen
, optlen
) != 0)
2654 * smack_socket_getpeersec_dgram - pull in packet label
2657 * @secid: pointer to where to put the secid of the packet
2659 * Sets the netlabel socket state on sk from parent
2661 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2662 struct sk_buff
*skb
, u32
*secid
)
2665 struct netlbl_lsm_secattr secattr
;
2667 char smack
[SMK_LABELLEN
];
2668 int family
= PF_INET
;
2673 * Only works for families with packets.
2677 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2679 family
= sk
->sk_family
;
2682 * Translate what netlabel gave us.
2684 netlbl_secattr_init(&secattr
);
2685 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2687 smack_from_secattr(&secattr
, smack
);
2688 netlbl_secattr_destroy(&secattr
);
2691 * Give up if we couldn't get anything
2696 s
= smack_to_secid(smack
);
2705 * smack_sock_graft - Initialize a newly created socket with an existing sock
2707 * @parent: parent socket
2709 * Set the smk_{in,out} state of an existing sock based on the process that
2710 * is creating the new socket.
2712 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2714 struct socket_smack
*ssp
;
2717 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
2720 ssp
= sk
->sk_security
;
2721 ssp
->smk_in
= ssp
->smk_out
= current_security();
2722 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
2726 * smack_inet_conn_request - Smack access check on connect
2727 * @sk: socket involved
2731 * Returns 0 if a task with the packet label could write to
2732 * the socket, otherwise an error code
2734 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2735 struct request_sock
*req
)
2737 u16 family
= sk
->sk_family
;
2738 struct socket_smack
*ssp
= sk
->sk_security
;
2739 struct netlbl_lsm_secattr secattr
;
2740 struct sockaddr_in addr
;
2742 char smack
[SMK_LABELLEN
];
2744 struct smk_audit_info ad
;
2746 /* handle mapped IPv4 packets arriving via IPv6 sockets */
2747 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
2750 netlbl_secattr_init(&secattr
);
2751 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2753 smack_from_secattr(&secattr
, smack
);
2755 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2756 netlbl_secattr_destroy(&secattr
);
2759 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2760 ad
.a
.u
.net
.family
= family
;
2761 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
2762 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
2765 * Receiving a packet requires that the other end be able to write
2766 * here. Read access is not required.
2768 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
, &ad
);
2773 * Save the peer's label in the request_sock so we can later setup
2774 * smk_packet in the child socket so that SO_PEERCRED can report it.
2776 req
->peer_secid
= smack_to_secid(smack
);
2779 * We need to decide if we want to label the incoming connection here
2780 * if we do we only need to label the request_sock and the stack will
2781 * propogate the wire-label to the sock when it is created.
2784 addr
.sin_addr
.s_addr
= hdr
->saddr
;
2786 if (smack_host_label(&addr
) == NULL
) {
2788 netlbl_secattr_init(&secattr
);
2789 smack_to_secattr(smack
, &secattr
);
2790 rc
= netlbl_req_setattr(req
, &secattr
);
2791 netlbl_secattr_destroy(&secattr
);
2794 netlbl_req_delattr(req
);
2801 * smack_inet_csk_clone - Copy the connection information to the new socket
2802 * @sk: the new socket
2803 * @req: the connection's request_sock
2805 * Transfer the connection's peer label to the newly created socket.
2807 static void smack_inet_csk_clone(struct sock
*sk
,
2808 const struct request_sock
*req
)
2810 struct socket_smack
*ssp
= sk
->sk_security
;
2813 if (req
->peer_secid
!= 0) {
2814 smack
= smack_from_secid(req
->peer_secid
);
2815 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2817 ssp
->smk_packet
[0] = '\0';
2821 * Key management security hooks
2823 * Casey has not tested key support very heavily.
2824 * The permission check is most likely too restrictive.
2825 * If you care about keys please have a look.
2830 * smack_key_alloc - Set the key security blob
2832 * @cred: the credentials to use
2835 * No allocation required
2839 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
2840 unsigned long flags
)
2842 key
->security
= cred
->security
;
2847 * smack_key_free - Clear the key security blob
2850 * Clear the blob pointer
2852 static void smack_key_free(struct key
*key
)
2854 key
->security
= NULL
;
2858 * smack_key_permission - Smack access on a key
2859 * @key_ref: gets to the object
2860 * @cred: the credentials to use
2863 * Return 0 if the task has read and write to the object,
2864 * an error code otherwise
2866 static int smack_key_permission(key_ref_t key_ref
,
2867 const struct cred
*cred
, key_perm_t perm
)
2870 struct smk_audit_info ad
;
2872 keyp
= key_ref_to_ptr(key_ref
);
2876 * If the key hasn't been initialized give it access so that
2879 if (keyp
->security
== NULL
)
2882 * This should not occur
2884 if (cred
->security
== NULL
)
2887 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
2888 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
2889 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
2891 return smk_access(cred
->security
, keyp
->security
,
2892 MAY_READWRITE
, &ad
);
2894 #endif /* CONFIG_KEYS */
2899 * Audit requires a unique representation of each Smack specific
2900 * rule. This unique representation is used to distinguish the
2901 * object to be audited from remaining kernel objects and also
2902 * works as a glue between the audit hooks.
2904 * Since repository entries are added but never deleted, we'll use
2905 * the smack_known label address related to the given audit rule as
2906 * the needed unique representation. This also better fits the smack
2907 * model where nearly everything is a label.
2912 * smack_audit_rule_init - Initialize a smack audit rule
2913 * @field: audit rule fields given from user-space (audit.h)
2914 * @op: required testing operator (=, !=, >, <, ...)
2915 * @rulestr: smack label to be audited
2916 * @vrule: pointer to save our own audit rule representation
2918 * Prepare to audit cases where (@field @op @rulestr) is true.
2919 * The label to be audited is created if necessay.
2921 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2923 char **rule
= (char **)vrule
;
2926 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2929 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
2932 *rule
= smk_import(rulestr
, 0);
2938 * smack_audit_rule_known - Distinguish Smack audit rules
2939 * @krule: rule of interest, in Audit kernel representation format
2941 * This is used to filter Smack rules from remaining Audit ones.
2942 * If it's proved that this rule belongs to us, the
2943 * audit_rule_match hook will be called to do the final judgement.
2945 static int smack_audit_rule_known(struct audit_krule
*krule
)
2947 struct audit_field
*f
;
2950 for (i
= 0; i
< krule
->field_count
; i
++) {
2951 f
= &krule
->fields
[i
];
2953 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2961 * smack_audit_rule_match - Audit given object ?
2962 * @secid: security id for identifying the object to test
2963 * @field: audit rule flags given from user-space
2964 * @op: required testing operator
2965 * @vrule: smack internal rule presentation
2966 * @actx: audit context associated with the check
2968 * The core Audit hook. It's used to take the decision of
2969 * whether to audit or not to audit a given object.
2971 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2972 struct audit_context
*actx
)
2978 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2979 "Smack: missing rule\n");
2983 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2986 smack
= smack_from_secid(secid
);
2989 * No need to do string comparisons. If a match occurs,
2990 * both pointers will point to the same smack_known
2993 if (op
== Audit_equal
)
2994 return (rule
== smack
);
2995 if (op
== Audit_not_equal
)
2996 return (rule
!= smack
);
3002 * smack_audit_rule_free - free smack rule representation
3003 * @vrule: rule to be freed.
3005 * No memory was allocated.
3007 static void smack_audit_rule_free(void *vrule
)
3012 #endif /* CONFIG_AUDIT */
3015 * smack_secid_to_secctx - return the smack label for a secid
3016 * @secid: incoming integer
3017 * @secdata: destination
3018 * @seclen: how long it is
3020 * Exists for networking code.
3022 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3024 char *sp
= smack_from_secid(secid
);
3027 *seclen
= strlen(sp
);
3032 * smack_secctx_to_secid - return the secid for a smack label
3033 * @secdata: smack label
3034 * @seclen: how long result is
3035 * @secid: outgoing integer
3037 * Exists for audit and networking code.
3039 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3041 *secid
= smack_to_secid(secdata
);
3046 * smack_release_secctx - don't do anything.
3050 * Exists to make sure nothing gets done, and properly
3052 static void smack_release_secctx(char *secdata
, u32 seclen
)
3056 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3058 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
3061 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3063 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
3066 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
3069 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
3077 struct security_operations smack_ops
= {
3080 .ptrace_access_check
= smack_ptrace_access_check
,
3081 .ptrace_traceme
= smack_ptrace_traceme
,
3082 .syslog
= smack_syslog
,
3084 .sb_alloc_security
= smack_sb_alloc_security
,
3085 .sb_free_security
= smack_sb_free_security
,
3086 .sb_copy_data
= smack_sb_copy_data
,
3087 .sb_kern_mount
= smack_sb_kern_mount
,
3088 .sb_statfs
= smack_sb_statfs
,
3089 .sb_mount
= smack_sb_mount
,
3090 .sb_umount
= smack_sb_umount
,
3092 .inode_alloc_security
= smack_inode_alloc_security
,
3093 .inode_free_security
= smack_inode_free_security
,
3094 .inode_init_security
= smack_inode_init_security
,
3095 .inode_link
= smack_inode_link
,
3096 .inode_unlink
= smack_inode_unlink
,
3097 .inode_rmdir
= smack_inode_rmdir
,
3098 .inode_rename
= smack_inode_rename
,
3099 .inode_permission
= smack_inode_permission
,
3100 .inode_setattr
= smack_inode_setattr
,
3101 .inode_getattr
= smack_inode_getattr
,
3102 .inode_setxattr
= smack_inode_setxattr
,
3103 .inode_post_setxattr
= smack_inode_post_setxattr
,
3104 .inode_getxattr
= smack_inode_getxattr
,
3105 .inode_removexattr
= smack_inode_removexattr
,
3106 .inode_getsecurity
= smack_inode_getsecurity
,
3107 .inode_setsecurity
= smack_inode_setsecurity
,
3108 .inode_listsecurity
= smack_inode_listsecurity
,
3109 .inode_getsecid
= smack_inode_getsecid
,
3111 .file_permission
= smack_file_permission
,
3112 .file_alloc_security
= smack_file_alloc_security
,
3113 .file_free_security
= smack_file_free_security
,
3114 .file_ioctl
= smack_file_ioctl
,
3115 .file_lock
= smack_file_lock
,
3116 .file_fcntl
= smack_file_fcntl
,
3117 .file_set_fowner
= smack_file_set_fowner
,
3118 .file_send_sigiotask
= smack_file_send_sigiotask
,
3119 .file_receive
= smack_file_receive
,
3121 .cred_alloc_blank
= smack_cred_alloc_blank
,
3122 .cred_free
= smack_cred_free
,
3123 .cred_prepare
= smack_cred_prepare
,
3124 .cred_commit
= smack_cred_commit
,
3125 .cred_transfer
= smack_cred_transfer
,
3126 .kernel_act_as
= smack_kernel_act_as
,
3127 .kernel_create_files_as
= smack_kernel_create_files_as
,
3128 .task_setpgid
= smack_task_setpgid
,
3129 .task_getpgid
= smack_task_getpgid
,
3130 .task_getsid
= smack_task_getsid
,
3131 .task_getsecid
= smack_task_getsecid
,
3132 .task_setnice
= smack_task_setnice
,
3133 .task_setioprio
= smack_task_setioprio
,
3134 .task_getioprio
= smack_task_getioprio
,
3135 .task_setscheduler
= smack_task_setscheduler
,
3136 .task_getscheduler
= smack_task_getscheduler
,
3137 .task_movememory
= smack_task_movememory
,
3138 .task_kill
= smack_task_kill
,
3139 .task_wait
= smack_task_wait
,
3140 .task_to_inode
= smack_task_to_inode
,
3142 .ipc_permission
= smack_ipc_permission
,
3143 .ipc_getsecid
= smack_ipc_getsecid
,
3145 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
3146 .msg_msg_free_security
= smack_msg_msg_free_security
,
3148 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
3149 .msg_queue_free_security
= smack_msg_queue_free_security
,
3150 .msg_queue_associate
= smack_msg_queue_associate
,
3151 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
3152 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
3153 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
3155 .shm_alloc_security
= smack_shm_alloc_security
,
3156 .shm_free_security
= smack_shm_free_security
,
3157 .shm_associate
= smack_shm_associate
,
3158 .shm_shmctl
= smack_shm_shmctl
,
3159 .shm_shmat
= smack_shm_shmat
,
3161 .sem_alloc_security
= smack_sem_alloc_security
,
3162 .sem_free_security
= smack_sem_free_security
,
3163 .sem_associate
= smack_sem_associate
,
3164 .sem_semctl
= smack_sem_semctl
,
3165 .sem_semop
= smack_sem_semop
,
3167 .d_instantiate
= smack_d_instantiate
,
3169 .getprocattr
= smack_getprocattr
,
3170 .setprocattr
= smack_setprocattr
,
3172 .unix_stream_connect
= smack_unix_stream_connect
,
3173 .unix_may_send
= smack_unix_may_send
,
3175 .socket_post_create
= smack_socket_post_create
,
3176 .socket_connect
= smack_socket_connect
,
3177 .socket_sendmsg
= smack_socket_sendmsg
,
3178 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
3179 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
3180 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
3181 .sk_alloc_security
= smack_sk_alloc_security
,
3182 .sk_free_security
= smack_sk_free_security
,
3183 .sock_graft
= smack_sock_graft
,
3184 .inet_conn_request
= smack_inet_conn_request
,
3185 .inet_csk_clone
= smack_inet_csk_clone
,
3187 /* key management security hooks */
3189 .key_alloc
= smack_key_alloc
,
3190 .key_free
= smack_key_free
,
3191 .key_permission
= smack_key_permission
,
3192 #endif /* CONFIG_KEYS */
3196 .audit_rule_init
= smack_audit_rule_init
,
3197 .audit_rule_known
= smack_audit_rule_known
,
3198 .audit_rule_match
= smack_audit_rule_match
,
3199 .audit_rule_free
= smack_audit_rule_free
,
3200 #endif /* CONFIG_AUDIT */
3202 .secid_to_secctx
= smack_secid_to_secctx
,
3203 .secctx_to_secid
= smack_secctx_to_secid
,
3204 .release_secctx
= smack_release_secctx
,
3205 .inode_notifysecctx
= smack_inode_notifysecctx
,
3206 .inode_setsecctx
= smack_inode_setsecctx
,
3207 .inode_getsecctx
= smack_inode_getsecctx
,
3211 static __init
void init_smack_know_list(void)
3213 list_add(&smack_known_huh
.list
, &smack_known_list
);
3214 list_add(&smack_known_hat
.list
, &smack_known_list
);
3215 list_add(&smack_known_star
.list
, &smack_known_list
);
3216 list_add(&smack_known_floor
.list
, &smack_known_list
);
3217 list_add(&smack_known_invalid
.list
, &smack_known_list
);
3218 list_add(&smack_known_web
.list
, &smack_known_list
);
3222 * smack_init - initialize the smack system
3226 static __init
int smack_init(void)
3230 if (!security_module_enable(&smack_ops
))
3233 printk(KERN_INFO
"Smack: Initializing.\n");
3236 * Set the security state for the initial task.
3238 cred
= (struct cred
*) current
->cred
;
3239 cred
->security
= &smack_known_floor
.smk_known
;
3241 /* initilize the smack_know_list */
3242 init_smack_know_list();
3246 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
3247 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
3248 spin_lock_init(&smack_known_star
.smk_cipsolock
);
3249 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
3250 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
3255 if (register_security(&smack_ops
))
3256 panic("smack: Unable to register with kernel.\n");
3262 * Smack requires early initialization in order to label
3263 * all processes and objects when they are created.
3265 security_initcall(smack_init
);