2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/slab.h>
31 #include <linux/mutex.h>
32 #include <linux/pipe_fs_i.h>
33 #include <net/netlabel.h>
34 #include <net/cipso_ipv4.h>
35 #include <linux/audit.h>
36 #include <linux/magic.h>
37 #include <linux/dcache.h>
38 #include <linux/personality.h>
39 #include <linux/msg.h>
40 #include <linux/shm.h>
41 #include <linux/binfmts.h>
44 #define task_security(task) (task_cred_xxx((task), security))
46 #define TRANS_TRUE "TRUE"
47 #define TRANS_TRUE_SIZE 4
50 * smk_fetch - Fetch the smack label from a file.
51 * @ip: a pointer to the inode
52 * @dp: a pointer to the dentry
54 * Returns a pointer to the master list entry for the Smack label
55 * or NULL if there was no label to fetch.
57 static char *smk_fetch(const char *name
, struct inode
*ip
, struct dentry
*dp
)
60 char in
[SMK_LABELLEN
];
62 if (ip
->i_op
->getxattr
== NULL
)
65 rc
= ip
->i_op
->getxattr(dp
, name
, in
, SMK_LABELLEN
);
69 return smk_import(in
, rc
);
73 * new_inode_smack - allocate an inode security blob
74 * @smack: a pointer to the Smack label to use in the blob
76 * Returns the new blob or NULL if there's no memory available
78 struct inode_smack
*new_inode_smack(char *smack
)
80 struct inode_smack
*isp
;
82 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
86 isp
->smk_inode
= smack
;
88 mutex_init(&isp
->smk_lock
);
94 * new_task_smack - allocate a task security blob
95 * @smack: a pointer to the Smack label to use in the blob
97 * Returns the new blob or NULL if there's no memory available
99 static struct task_smack
*new_task_smack(char *task
, char *forked
, gfp_t gfp
)
101 struct task_smack
*tsp
;
103 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
107 tsp
->smk_task
= task
;
108 tsp
->smk_forked
= forked
;
109 INIT_LIST_HEAD(&tsp
->smk_rules
);
110 mutex_init(&tsp
->smk_rules_lock
);
116 * smk_copy_rules - copy a rule set
117 * @nhead - new rules header pointer
118 * @ohead - old rules header pointer
120 * Returns 0 on success, -ENOMEM on error
122 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
125 struct smack_rule
*nrp
;
126 struct smack_rule
*orp
;
129 INIT_LIST_HEAD(nhead
);
131 list_for_each_entry_rcu(orp
, ohead
, list
) {
132 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
138 list_add_rcu(&nrp
->list
, nhead
);
145 * We he, that is fun!
149 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
150 * @ctp: child task pointer
151 * @mode: ptrace attachment mode
153 * Returns 0 if access is OK, an error code otherwise
155 * Do the capability checks, and require read and write.
157 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
160 struct smk_audit_info ad
;
163 rc
= cap_ptrace_access_check(ctp
, mode
);
167 tsp
= smk_of_task(task_security(ctp
));
168 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
169 smk_ad_setfield_u_tsk(&ad
, ctp
);
171 rc
= smk_curacc(tsp
, MAY_READWRITE
, &ad
);
176 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
177 * @ptp: parent task pointer
179 * Returns 0 if access is OK, an error code otherwise
181 * Do the capability checks, and require read and write.
183 static int smack_ptrace_traceme(struct task_struct
*ptp
)
186 struct smk_audit_info ad
;
189 rc
= cap_ptrace_traceme(ptp
);
193 tsp
= smk_of_task(task_security(ptp
));
194 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
195 smk_ad_setfield_u_tsk(&ad
, ptp
);
197 rc
= smk_curacc(tsp
, MAY_READWRITE
, &ad
);
202 * smack_syslog - Smack approval on syslog
203 * @type: message type
205 * Require that the task has the floor label
207 * Returns 0 on success, error code otherwise.
209 static int smack_syslog(int typefrom_file
)
212 char *sp
= smk_of_current();
214 if (capable(CAP_MAC_OVERRIDE
))
217 if (sp
!= smack_known_floor
.smk_known
)
229 * smack_sb_alloc_security - allocate a superblock blob
230 * @sb: the superblock getting the blob
232 * Returns 0 on success or -ENOMEM on error.
234 static int smack_sb_alloc_security(struct super_block
*sb
)
236 struct superblock_smack
*sbsp
;
238 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
243 sbsp
->smk_root
= smack_known_floor
.smk_known
;
244 sbsp
->smk_default
= smack_known_floor
.smk_known
;
245 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
246 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
247 sbsp
->smk_initialized
= 0;
248 spin_lock_init(&sbsp
->smk_sblock
);
250 sb
->s_security
= sbsp
;
256 * smack_sb_free_security - free a superblock blob
257 * @sb: the superblock getting the blob
260 static void smack_sb_free_security(struct super_block
*sb
)
262 kfree(sb
->s_security
);
263 sb
->s_security
= NULL
;
267 * smack_sb_copy_data - copy mount options data for processing
268 * @orig: where to start
269 * @smackopts: mount options string
271 * Returns 0 on success or -ENOMEM on error.
273 * Copy the Smack specific mount options out of the mount
276 static int smack_sb_copy_data(char *orig
, char *smackopts
)
278 char *cp
, *commap
, *otheropts
, *dp
;
280 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
281 if (otheropts
== NULL
)
284 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
285 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
287 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
289 else if (strstr(cp
, SMK_FSHAT
) == cp
)
291 else if (strstr(cp
, SMK_FSROOT
) == cp
)
296 commap
= strchr(cp
, ',');
305 strcpy(orig
, otheropts
);
306 free_page((unsigned long)otheropts
);
312 * smack_sb_kern_mount - Smack specific mount processing
313 * @sb: the file system superblock
314 * @flags: the mount flags
315 * @data: the smack mount options
317 * Returns 0 on success, an error code on failure
319 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
321 struct dentry
*root
= sb
->s_root
;
322 struct inode
*inode
= root
->d_inode
;
323 struct superblock_smack
*sp
= sb
->s_security
;
324 struct inode_smack
*isp
;
329 spin_lock(&sp
->smk_sblock
);
330 if (sp
->smk_initialized
!= 0) {
331 spin_unlock(&sp
->smk_sblock
);
334 sp
->smk_initialized
= 1;
335 spin_unlock(&sp
->smk_sblock
);
337 for (op
= data
; op
!= NULL
; op
= commap
) {
338 commap
= strchr(op
, ',');
342 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
343 op
+= strlen(SMK_FSHAT
);
344 nsp
= smk_import(op
, 0);
347 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
348 op
+= strlen(SMK_FSFLOOR
);
349 nsp
= smk_import(op
, 0);
352 } else if (strncmp(op
, SMK_FSDEFAULT
,
353 strlen(SMK_FSDEFAULT
)) == 0) {
354 op
+= strlen(SMK_FSDEFAULT
);
355 nsp
= smk_import(op
, 0);
357 sp
->smk_default
= nsp
;
358 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
359 op
+= strlen(SMK_FSROOT
);
360 nsp
= smk_import(op
, 0);
367 * Initialize the root inode.
369 isp
= inode
->i_security
;
371 inode
->i_security
= new_inode_smack(sp
->smk_root
);
373 isp
->smk_inode
= sp
->smk_root
;
379 * smack_sb_statfs - Smack check on statfs
380 * @dentry: identifies the file system in question
382 * Returns 0 if current can read the floor of the filesystem,
383 * and error code otherwise
385 static int smack_sb_statfs(struct dentry
*dentry
)
387 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
389 struct smk_audit_info ad
;
391 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
392 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
394 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
399 * smack_sb_mount - Smack check for mounting
406 * Returns 0 if current can write the floor of the filesystem
407 * being mounted on, an error code otherwise.
409 static int smack_sb_mount(char *dev_name
, struct path
*path
,
410 char *type
, unsigned long flags
, void *data
)
412 struct superblock_smack
*sbp
= path
->dentry
->d_sb
->s_security
;
413 struct smk_audit_info ad
;
415 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
416 smk_ad_setfield_u_fs_path(&ad
, *path
);
418 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
422 * smack_sb_umount - Smack check for unmounting
423 * @mnt: file system to unmount
426 * Returns 0 if current can write the floor of the filesystem
427 * being unmounted, an error code otherwise.
429 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
431 struct superblock_smack
*sbp
;
432 struct smk_audit_info ad
;
435 path
.dentry
= mnt
->mnt_root
;
438 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
439 smk_ad_setfield_u_fs_path(&ad
, path
);
441 sbp
= path
.dentry
->d_sb
->s_security
;
442 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
450 * smack_bprm_set_creds - set creds for exec
451 * @bprm: the exec information
453 * Returns 0 if it gets a blob, -ENOMEM otherwise
455 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
457 struct inode
*inode
= bprm
->file
->f_path
.dentry
->d_inode
;
458 struct task_smack
*bsp
= bprm
->cred
->security
;
459 struct inode_smack
*isp
;
462 rc
= cap_bprm_set_creds(bprm
);
466 if (bprm
->cred_prepared
)
469 isp
= inode
->i_security
;
470 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
476 bsp
->smk_task
= isp
->smk_task
;
477 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
483 * smack_bprm_committing_creds - Prepare to install the new credentials
486 * @bprm: binprm for exec
488 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
490 struct task_smack
*bsp
= bprm
->cred
->security
;
492 if (bsp
->smk_task
!= bsp
->smk_forked
)
493 current
->pdeath_signal
= 0;
497 * smack_bprm_secureexec - Return the decision to use secureexec.
498 * @bprm: binprm for exec
500 * Returns 0 on success.
502 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
504 struct task_smack
*tsp
= current_security();
505 int ret
= cap_bprm_secureexec(bprm
);
507 if (!ret
&& (tsp
->smk_task
!= tsp
->smk_forked
))
518 * smack_inode_alloc_security - allocate an inode blob
519 * @inode: the inode in need of a blob
521 * Returns 0 if it gets a blob, -ENOMEM otherwise
523 static int smack_inode_alloc_security(struct inode
*inode
)
525 inode
->i_security
= new_inode_smack(smk_of_current());
526 if (inode
->i_security
== NULL
)
532 * smack_inode_free_security - free an inode blob
533 * @inode: the inode with a blob
535 * Clears the blob pointer in inode
537 static void smack_inode_free_security(struct inode
*inode
)
539 kfree(inode
->i_security
);
540 inode
->i_security
= NULL
;
544 * smack_inode_init_security - copy out the smack from an inode
548 * @name: where to put the attribute name
549 * @value: where to put the attribute value
550 * @len: where to put the length of the attribute
552 * Returns 0 if it all works out, -ENOMEM if there's no memory
554 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
555 const struct qstr
*qstr
, char **name
,
556 void **value
, size_t *len
)
558 struct smack_known
*skp
;
559 char *csp
= smk_of_current();
560 char *isp
= smk_of_inode(inode
);
561 char *dsp
= smk_of_inode(dir
);
565 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
571 skp
= smk_find_entry(csp
);
573 may
= smk_access_entry(csp
, dsp
, &skp
->smk_rules
);
577 * If the access rule allows transmutation and
578 * the directory requests transmutation then
579 * by all means transmute.
581 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
582 smk_inode_transmutable(dir
))
585 *value
= kstrdup(isp
, GFP_KERNEL
);
591 *len
= strlen(isp
) + 1;
597 * smack_inode_link - Smack check on link
598 * @old_dentry: the existing object
600 * @new_dentry: the new object
602 * Returns 0 if access is permitted, an error code otherwise
604 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
605 struct dentry
*new_dentry
)
608 struct smk_audit_info ad
;
611 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
612 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
614 isp
= smk_of_inode(old_dentry
->d_inode
);
615 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
617 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
618 isp
= smk_of_inode(new_dentry
->d_inode
);
619 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
620 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
627 * smack_inode_unlink - Smack check on inode deletion
628 * @dir: containing directory object
629 * @dentry: file to unlink
631 * Returns 0 if current can write the containing directory
632 * and the object, error code otherwise
634 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
636 struct inode
*ip
= dentry
->d_inode
;
637 struct smk_audit_info ad
;
640 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
641 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
644 * You need write access to the thing you're unlinking
646 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
649 * You also need write access to the containing directory
651 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
652 smk_ad_setfield_u_fs_inode(&ad
, dir
);
653 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
659 * smack_inode_rmdir - Smack check on directory deletion
660 * @dir: containing directory object
661 * @dentry: directory to unlink
663 * Returns 0 if current can write the containing directory
664 * and the directory, error code otherwise
666 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
668 struct smk_audit_info ad
;
671 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
672 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
675 * You need write access to the thing you're removing
677 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
680 * You also need write access to the containing directory
682 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
683 smk_ad_setfield_u_fs_inode(&ad
, dir
);
684 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
691 * smack_inode_rename - Smack check on rename
692 * @old_inode: the old directory
693 * @old_dentry: unused
694 * @new_inode: the new directory
695 * @new_dentry: unused
697 * Read and write access is required on both the old and
700 * Returns 0 if access is permitted, an error code otherwise
702 static int smack_inode_rename(struct inode
*old_inode
,
703 struct dentry
*old_dentry
,
704 struct inode
*new_inode
,
705 struct dentry
*new_dentry
)
709 struct smk_audit_info ad
;
711 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
712 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
714 isp
= smk_of_inode(old_dentry
->d_inode
);
715 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
717 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
718 isp
= smk_of_inode(new_dentry
->d_inode
);
719 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
720 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
726 * smack_inode_permission - Smack version of permission()
727 * @inode: the inode in question
728 * @mask: the access requested
730 * This is the important Smack hook.
732 * Returns 0 if access is permitted, -EACCES otherwise
734 static int smack_inode_permission(struct inode
*inode
, int mask
)
736 struct smk_audit_info ad
;
737 int no_block
= mask
& MAY_NOT_BLOCK
;
739 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
741 * No permission to check. Existence test. Yup, it's there.
746 /* May be droppable after audit */
749 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
750 smk_ad_setfield_u_fs_inode(&ad
, inode
);
751 return smk_curacc(smk_of_inode(inode
), mask
, &ad
);
755 * smack_inode_setattr - Smack check for setting attributes
756 * @dentry: the object
757 * @iattr: for the force flag
759 * Returns 0 if access is permitted, an error code otherwise
761 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
763 struct smk_audit_info ad
;
765 * Need to allow for clearing the setuid bit.
767 if (iattr
->ia_valid
& ATTR_FORCE
)
769 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
770 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
772 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
776 * smack_inode_getattr - Smack check for getting attributes
778 * @dentry: the object
780 * Returns 0 if access is permitted, an error code otherwise
782 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
784 struct smk_audit_info ad
;
787 path
.dentry
= dentry
;
790 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
791 smk_ad_setfield_u_fs_path(&ad
, path
);
792 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
796 * smack_inode_setxattr - Smack check for setting xattrs
797 * @dentry: the object
798 * @name: name of the attribute
803 * This protects the Smack attribute explicitly.
805 * Returns 0 if access is permitted, an error code otherwise
807 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
808 const void *value
, size_t size
, int flags
)
810 struct smk_audit_info ad
;
813 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
814 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
815 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
816 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
817 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
818 if (!capable(CAP_MAC_ADMIN
))
821 * check label validity here so import wont fail on
824 if (size
== 0 || size
>= SMK_LABELLEN
||
825 smk_import(value
, size
) == NULL
)
827 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
828 if (!capable(CAP_MAC_ADMIN
))
830 if (size
!= TRANS_TRUE_SIZE
||
831 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
834 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
836 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
837 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
840 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
846 * smack_inode_post_setxattr - Apply the Smack update approved above
848 * @name: attribute name
849 * @value: attribute value
850 * @size: attribute size
853 * Set the pointer in the inode blob to the entry found
854 * in the master label list.
856 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
857 const void *value
, size_t size
, int flags
)
860 struct inode_smack
*isp
= dentry
->d_inode
->i_security
;
862 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
863 nsp
= smk_import(value
, size
);
865 isp
->smk_inode
= nsp
;
867 isp
->smk_inode
= smack_known_invalid
.smk_known
;
868 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
869 nsp
= smk_import(value
, size
);
873 isp
->smk_task
= smack_known_invalid
.smk_known
;
874 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
875 nsp
= smk_import(value
, size
);
879 isp
->smk_mmap
= smack_known_invalid
.smk_known
;
880 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
881 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
887 * smack_inode_getxattr - Smack check on getxattr
888 * @dentry: the object
891 * Returns 0 if access is permitted, an error code otherwise
893 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
895 struct smk_audit_info ad
;
897 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
898 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
900 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
904 * smack_inode_removexattr - Smack check on removexattr
905 * @dentry: the object
906 * @name: name of the attribute
908 * Removing the Smack attribute requires CAP_MAC_ADMIN
910 * Returns 0 if access is permitted, an error code otherwise
912 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
914 struct inode_smack
*isp
;
915 struct smk_audit_info ad
;
918 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
919 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
920 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
921 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
922 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
923 strcmp(name
, XATTR_NAME_SMACKMMAP
)) {
924 if (!capable(CAP_MAC_ADMIN
))
927 rc
= cap_inode_removexattr(dentry
, name
);
929 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
930 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
932 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
935 isp
= dentry
->d_inode
->i_security
;
936 isp
->smk_task
= NULL
;
937 isp
->smk_mmap
= NULL
;
944 * smack_inode_getsecurity - get smack xattrs
946 * @name: attribute name
947 * @buffer: where to put the result
950 * Returns the size of the attribute or an error code
952 static int smack_inode_getsecurity(const struct inode
*inode
,
953 const char *name
, void **buffer
,
956 struct socket_smack
*ssp
;
958 struct super_block
*sbp
;
959 struct inode
*ip
= (struct inode
*)inode
;
964 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
965 isp
= smk_of_inode(inode
);
966 ilen
= strlen(isp
) + 1;
972 * The rest of the Smack xattrs are only on sockets.
975 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
979 if (sock
== NULL
|| sock
->sk
== NULL
)
982 ssp
= sock
->sk
->sk_security
;
984 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
986 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
991 ilen
= strlen(isp
) + 1;
1002 * smack_inode_listsecurity - list the Smack attributes
1003 * @inode: the object
1004 * @buffer: where they go
1005 * @buffer_size: size of buffer
1007 * Returns 0 on success, -EINVAL otherwise
1009 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1012 int len
= strlen(XATTR_NAME_SMACK
);
1014 if (buffer
!= NULL
&& len
<= buffer_size
) {
1015 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1022 * smack_inode_getsecid - Extract inode's security id
1023 * @inode: inode to extract the info from
1024 * @secid: where result will be saved
1026 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1028 struct inode_smack
*isp
= inode
->i_security
;
1030 *secid
= smack_to_secid(isp
->smk_inode
);
1038 * smack_file_permission - Smack check on file operations
1044 * Should access checks be done on each read or write?
1045 * UNICOS and SELinux say yes.
1046 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1048 * I'll say no for now. Smack does not do the frequent
1049 * label changing that SELinux does.
1051 static int smack_file_permission(struct file
*file
, int mask
)
1057 * smack_file_alloc_security - assign a file security blob
1060 * The security blob for a file is a pointer to the master
1061 * label list, so no allocation is done.
1065 static int smack_file_alloc_security(struct file
*file
)
1067 file
->f_security
= smk_of_current();
1072 * smack_file_free_security - clear a file security blob
1075 * The security blob for a file is a pointer to the master
1076 * label list, so no memory is freed.
1078 static void smack_file_free_security(struct file
*file
)
1080 file
->f_security
= NULL
;
1084 * smack_file_ioctl - Smack check on ioctls
1089 * Relies heavily on the correct use of the ioctl command conventions.
1091 * Returns 0 if allowed, error code otherwise
1093 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1097 struct smk_audit_info ad
;
1099 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1100 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1102 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
1103 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1105 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
1106 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1112 * smack_file_lock - Smack check on file locking
1116 * Returns 0 if current has write access, error code otherwise
1118 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1120 struct smk_audit_info ad
;
1122 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1123 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1124 return smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1128 * smack_file_fcntl - Smack check on fcntl
1130 * @cmd: what action to check
1133 * Generally these operations are harmless.
1134 * File locking operations present an obvious mechanism
1135 * for passing information, so they require write access.
1137 * Returns 0 if current has access, error code otherwise
1139 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1142 struct smk_audit_info ad
;
1152 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1153 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1154 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1165 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1166 * if mapping anonymous memory.
1167 * @file contains the file structure for file to map (may be NULL).
1168 * @reqprot contains the protection requested by the application.
1169 * @prot contains the protection that will be applied by the kernel.
1170 * @flags contains the operational flags.
1171 * Return 0 if permission is granted.
1173 static int smack_file_mmap(struct file
*file
,
1174 unsigned long reqprot
, unsigned long prot
,
1175 unsigned long flags
, unsigned long addr
,
1176 unsigned long addr_only
)
1178 struct smack_known
*skp
;
1179 struct smack_rule
*srp
;
1180 struct task_smack
*tsp
;
1184 struct inode_smack
*isp
;
1191 /* do DAC check on address space usage */
1192 rc
= cap_file_mmap(file
, reqprot
, prot
, flags
, addr
, addr_only
);
1193 if (rc
|| addr_only
)
1196 if (file
== NULL
|| file
->f_dentry
== NULL
)
1199 dp
= file
->f_dentry
;
1201 if (dp
->d_inode
== NULL
)
1204 isp
= dp
->d_inode
->i_security
;
1205 if (isp
->smk_mmap
== NULL
)
1207 msmack
= isp
->smk_mmap
;
1209 tsp
= current_security();
1210 sp
= smk_of_current();
1211 skp
= smk_find_entry(sp
);
1216 * For each Smack rule associated with the subject
1217 * label verify that the SMACK64MMAP also has access
1218 * to that rule's object label.
1220 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1221 osmack
= srp
->smk_object
;
1223 * Matching labels always allows access.
1225 if (msmack
== osmack
)
1228 * If there is a matching local rule take
1229 * that into account as well.
1231 may
= smk_access_entry(srp
->smk_subject
, osmack
,
1234 may
= srp
->smk_access
;
1236 may
&= srp
->smk_access
;
1238 * If may is zero the SMACK64MMAP subject can't
1239 * possibly have less access.
1245 * Fetch the global list entry.
1246 * If there isn't one a SMACK64MMAP subject
1247 * can't have as much access as current.
1249 skp
= smk_find_entry(msmack
);
1250 mmay
= smk_access_entry(msmack
, osmack
, &skp
->smk_rules
);
1251 if (mmay
== -ENOENT
) {
1256 * If there is a local entry it modifies the
1257 * potential access, too.
1259 tmay
= smk_access_entry(msmack
, osmack
, &tsp
->smk_rules
);
1260 if (tmay
!= -ENOENT
)
1264 * If there is any access available to current that is
1265 * not available to a SMACK64MMAP subject
1268 if ((may
| mmay
) != mmay
) {
1280 * smack_file_set_fowner - set the file security blob value
1281 * @file: object in question
1284 * Further research may be required on this one.
1286 static int smack_file_set_fowner(struct file
*file
)
1288 file
->f_security
= smk_of_current();
1293 * smack_file_send_sigiotask - Smack on sigio
1294 * @tsk: The target task
1295 * @fown: the object the signal come from
1298 * Allow a privileged task to get signals even if it shouldn't
1300 * Returns 0 if a subject with the object's smack could
1301 * write to the task, an error code otherwise.
1303 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1304 struct fown_struct
*fown
, int signum
)
1308 char *tsp
= smk_of_task(tsk
->cred
->security
);
1309 struct smk_audit_info ad
;
1312 * struct fown_struct is never outside the context of a struct file
1314 file
= container_of(fown
, struct file
, f_owner
);
1316 /* we don't log here as rc can be overriden */
1317 rc
= smk_access(file
->f_security
, tsp
, MAY_WRITE
, NULL
);
1318 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1321 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1322 smk_ad_setfield_u_tsk(&ad
, tsk
);
1323 smack_log(file
->f_security
, tsp
, MAY_WRITE
, rc
, &ad
);
1328 * smack_file_receive - Smack file receive check
1331 * Returns 0 if current has access, error code otherwise
1333 static int smack_file_receive(struct file
*file
)
1336 struct smk_audit_info ad
;
1338 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1339 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1341 * This code relies on bitmasks.
1343 if (file
->f_mode
& FMODE_READ
)
1345 if (file
->f_mode
& FMODE_WRITE
)
1348 return smk_curacc(file
->f_security
, may
, &ad
);
1352 * smack_dentry_open - Smack dentry open processing
1356 * Set the security blob in the file structure.
1360 static int smack_dentry_open(struct file
*file
, const struct cred
*cred
)
1362 struct inode_smack
*isp
= file
->f_path
.dentry
->d_inode
->i_security
;
1364 file
->f_security
= isp
->smk_inode
;
1374 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1375 * @new: the new credentials
1376 * @gfp: the atomicity of any memory allocations
1378 * Prepare a blank set of credentials for modification. This must allocate all
1379 * the memory the LSM module might require such that cred_transfer() can
1380 * complete without error.
1382 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1384 struct task_smack
*tsp
;
1386 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1390 cred
->security
= tsp
;
1397 * smack_cred_free - "free" task-level security credentials
1398 * @cred: the credentials in question
1401 static void smack_cred_free(struct cred
*cred
)
1403 struct task_smack
*tsp
= cred
->security
;
1404 struct smack_rule
*rp
;
1405 struct list_head
*l
;
1406 struct list_head
*n
;
1410 cred
->security
= NULL
;
1412 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1413 rp
= list_entry(l
, struct smack_rule
, list
);
1414 list_del(&rp
->list
);
1421 * smack_cred_prepare - prepare new set of credentials for modification
1422 * @new: the new credentials
1423 * @old: the original credentials
1424 * @gfp: the atomicity of any memory allocations
1426 * Prepare a new set of credentials for modification.
1428 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1431 struct task_smack
*old_tsp
= old
->security
;
1432 struct task_smack
*new_tsp
;
1435 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1436 if (new_tsp
== NULL
)
1439 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1443 new->security
= new_tsp
;
1448 * smack_cred_transfer - Transfer the old credentials to the new credentials
1449 * @new: the new credentials
1450 * @old: the original credentials
1452 * Fill in a set of blank credentials from another set of credentials.
1454 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1456 struct task_smack
*old_tsp
= old
->security
;
1457 struct task_smack
*new_tsp
= new->security
;
1459 new_tsp
->smk_task
= old_tsp
->smk_task
;
1460 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1461 mutex_init(&new_tsp
->smk_rules_lock
);
1462 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1465 /* cbs copy rule list */
1469 * smack_kernel_act_as - Set the subjective context in a set of credentials
1470 * @new: points to the set of credentials to be modified.
1471 * @secid: specifies the security ID to be set
1473 * Set the security data for a kernel service.
1475 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1477 struct task_smack
*new_tsp
= new->security
;
1478 char *smack
= smack_from_secid(secid
);
1483 new_tsp
->smk_task
= smack
;
1488 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1489 * @new: points to the set of credentials to be modified
1490 * @inode: points to the inode to use as a reference
1492 * Set the file creation context in a set of credentials to the same
1493 * as the objective context of the specified inode
1495 static int smack_kernel_create_files_as(struct cred
*new,
1496 struct inode
*inode
)
1498 struct inode_smack
*isp
= inode
->i_security
;
1499 struct task_smack
*tsp
= new->security
;
1501 tsp
->smk_forked
= isp
->smk_inode
;
1502 tsp
->smk_task
= isp
->smk_inode
;
1507 * smk_curacc_on_task - helper to log task related access
1508 * @p: the task object
1509 * @access: the access requested
1510 * @caller: name of the calling function for audit
1512 * Return 0 if access is permitted
1514 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
1517 struct smk_audit_info ad
;
1519 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
1520 smk_ad_setfield_u_tsk(&ad
, p
);
1521 return smk_curacc(smk_of_task(task_security(p
)), access
, &ad
);
1525 * smack_task_setpgid - Smack check on setting pgid
1526 * @p: the task object
1529 * Return 0 if write access is permitted
1531 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1533 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1537 * smack_task_getpgid - Smack access check for getpgid
1538 * @p: the object task
1540 * Returns 0 if current can read the object task, error code otherwise
1542 static int smack_task_getpgid(struct task_struct
*p
)
1544 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1548 * smack_task_getsid - Smack access check for getsid
1549 * @p: the object task
1551 * Returns 0 if current can read the object task, error code otherwise
1553 static int smack_task_getsid(struct task_struct
*p
)
1555 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1559 * smack_task_getsecid - get the secid of the task
1560 * @p: the object task
1561 * @secid: where to put the result
1563 * Sets the secid to contain a u32 version of the smack label.
1565 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1567 *secid
= smack_to_secid(smk_of_task(task_security(p
)));
1571 * smack_task_setnice - Smack check on setting nice
1572 * @p: the task object
1575 * Return 0 if write access is permitted
1577 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1581 rc
= cap_task_setnice(p
, nice
);
1583 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1588 * smack_task_setioprio - Smack check on setting ioprio
1589 * @p: the task object
1592 * Return 0 if write access is permitted
1594 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1598 rc
= cap_task_setioprio(p
, ioprio
);
1600 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1605 * smack_task_getioprio - Smack check on reading ioprio
1606 * @p: the task object
1608 * Return 0 if read access is permitted
1610 static int smack_task_getioprio(struct task_struct
*p
)
1612 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1616 * smack_task_setscheduler - Smack check on setting scheduler
1617 * @p: the task object
1621 * Return 0 if read access is permitted
1623 static int smack_task_setscheduler(struct task_struct
*p
)
1627 rc
= cap_task_setscheduler(p
);
1629 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1634 * smack_task_getscheduler - Smack check on reading scheduler
1635 * @p: the task object
1637 * Return 0 if read access is permitted
1639 static int smack_task_getscheduler(struct task_struct
*p
)
1641 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1645 * smack_task_movememory - Smack check on moving memory
1646 * @p: the task object
1648 * Return 0 if write access is permitted
1650 static int smack_task_movememory(struct task_struct
*p
)
1652 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1656 * smack_task_kill - Smack check on signal delivery
1657 * @p: the task object
1660 * @secid: identifies the smack to use in lieu of current's
1662 * Return 0 if write access is permitted
1664 * The secid behavior is an artifact of an SELinux hack
1665 * in the USB code. Someday it may go away.
1667 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1670 struct smk_audit_info ad
;
1672 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1673 smk_ad_setfield_u_tsk(&ad
, p
);
1675 * Sending a signal requires that the sender
1676 * can write the receiver.
1679 return smk_curacc(smk_of_task(task_security(p
)), MAY_WRITE
,
1682 * If the secid isn't 0 we're dealing with some USB IO
1683 * specific behavior. This is not clean. For one thing
1684 * we can't take privilege into account.
1686 return smk_access(smack_from_secid(secid
),
1687 smk_of_task(task_security(p
)), MAY_WRITE
, &ad
);
1691 * smack_task_wait - Smack access check for waiting
1692 * @p: task to wait for
1694 * Returns 0 if current can wait for p, error code otherwise
1696 static int smack_task_wait(struct task_struct
*p
)
1698 struct smk_audit_info ad
;
1699 char *sp
= smk_of_current();
1700 char *tsp
= smk_of_forked(task_security(p
));
1703 /* we don't log here, we can be overriden */
1704 rc
= smk_access(tsp
, sp
, MAY_WRITE
, NULL
);
1709 * Allow the operation to succeed if either task
1710 * has privilege to perform operations that might
1711 * account for the smack labels having gotten to
1712 * be different in the first place.
1714 * This breaks the strict subject/object access
1715 * control ideal, taking the object's privilege
1716 * state into account in the decision as well as
1719 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1721 /* we log only if we didn't get overriden */
1723 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1724 smk_ad_setfield_u_tsk(&ad
, p
);
1725 smack_log(tsp
, sp
, MAY_WRITE
, rc
, &ad
);
1730 * smack_task_to_inode - copy task smack into the inode blob
1731 * @p: task to copy from
1732 * @inode: inode to copy to
1734 * Sets the smack pointer in the inode security blob
1736 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1738 struct inode_smack
*isp
= inode
->i_security
;
1739 isp
->smk_inode
= smk_of_task(task_security(p
));
1747 * smack_sk_alloc_security - Allocate a socket blob
1750 * @gfp_flags: memory allocation flags
1752 * Assign Smack pointers to current
1754 * Returns 0 on success, -ENOMEM is there's no memory
1756 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1758 char *csp
= smk_of_current();
1759 struct socket_smack
*ssp
;
1761 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1767 ssp
->smk_packet
= NULL
;
1769 sk
->sk_security
= ssp
;
1775 * smack_sk_free_security - Free a socket blob
1778 * Clears the blob pointer
1780 static void smack_sk_free_security(struct sock
*sk
)
1782 kfree(sk
->sk_security
);
1786 * smack_host_label - check host based restrictions
1787 * @sip: the object end
1789 * looks for host based access restrictions
1791 * This version will only be appropriate for really small sets of single label
1792 * hosts. The caller is responsible for ensuring that the RCU read lock is
1793 * taken before calling this function.
1795 * Returns the label of the far end or NULL if it's not special.
1797 static char *smack_host_label(struct sockaddr_in
*sip
)
1799 struct smk_netlbladdr
*snp
;
1800 struct in_addr
*siap
= &sip
->sin_addr
;
1802 if (siap
->s_addr
== 0)
1805 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
1807 * we break after finding the first match because
1808 * the list is sorted from longest to shortest mask
1809 * so we have found the most specific match
1811 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1812 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1813 /* we have found the special CIPSO option */
1814 if (snp
->smk_label
== smack_cipso_option
)
1816 return snp
->smk_label
;
1823 * smack_set_catset - convert a capset to netlabel mls categories
1824 * @catset: the Smack categories
1825 * @sap: where to put the netlabel categories
1827 * Allocates and fills attr.mls.cat
1829 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1840 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1841 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1842 sap
->attr
.mls
.cat
->startbit
= 0;
1844 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1845 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1848 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1854 * smack_to_secattr - fill a secattr from a smack value
1855 * @smack: the smack value
1856 * @nlsp: where the result goes
1858 * Casey says that CIPSO is good enough for now.
1859 * It can be used to effect.
1860 * It can also be abused to effect when necessary.
1861 * Apologies to the TSIG group in general and GW in particular.
1863 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1865 struct smack_cipso cipso
;
1868 nlsp
->domain
= smack
;
1869 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1871 rc
= smack_to_cipso(smack
, &cipso
);
1873 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1874 smack_set_catset(cipso
.smk_catset
, nlsp
);
1876 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1877 smack_set_catset(smack
, nlsp
);
1882 * smack_netlabel - Set the secattr on a socket
1884 * @labeled: socket label scheme
1886 * Convert the outbound smack value (smk_out) to a
1887 * secattr and attach it to the socket.
1889 * Returns 0 on success or an error code
1891 static int smack_netlabel(struct sock
*sk
, int labeled
)
1893 struct socket_smack
*ssp
= sk
->sk_security
;
1894 struct netlbl_lsm_secattr secattr
;
1898 * Usually the netlabel code will handle changing the
1899 * packet labeling based on the label.
1900 * The case of a single label host is different, because
1901 * a single label host should never get a labeled packet
1902 * even though the label is usually associated with a packet
1906 bh_lock_sock_nested(sk
);
1908 if (ssp
->smk_out
== smack_net_ambient
||
1909 labeled
== SMACK_UNLABELED_SOCKET
)
1910 netlbl_sock_delattr(sk
);
1912 netlbl_secattr_init(&secattr
);
1913 smack_to_secattr(ssp
->smk_out
, &secattr
);
1914 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &secattr
);
1915 netlbl_secattr_destroy(&secattr
);
1925 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1927 * @sap: the destination address
1929 * Set the correct secattr for the given socket based on the destination
1930 * address and perform any outbound access checks needed.
1932 * Returns 0 on success or an error code.
1935 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
1940 struct socket_smack
*ssp
= sk
->sk_security
;
1941 struct smk_audit_info ad
;
1944 hostsp
= smack_host_label(sap
);
1945 if (hostsp
!= NULL
) {
1946 sk_lbl
= SMACK_UNLABELED_SOCKET
;
1948 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
1949 ad
.a
.u
.net
.family
= sap
->sin_family
;
1950 ad
.a
.u
.net
.dport
= sap
->sin_port
;
1951 ad
.a
.u
.net
.v4info
.daddr
= sap
->sin_addr
.s_addr
;
1953 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
, &ad
);
1955 sk_lbl
= SMACK_CIPSO_SOCKET
;
1962 return smack_netlabel(sk
, sk_lbl
);
1966 * smack_inode_setsecurity - set smack xattrs
1967 * @inode: the object
1968 * @name: attribute name
1969 * @value: attribute value
1970 * @size: size of the attribute
1973 * Sets the named attribute in the appropriate blob
1975 * Returns 0 on success, or an error code
1977 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1978 const void *value
, size_t size
, int flags
)
1981 struct inode_smack
*nsp
= inode
->i_security
;
1982 struct socket_smack
*ssp
;
1983 struct socket
*sock
;
1986 if (value
== NULL
|| size
> SMK_LABELLEN
|| size
== 0)
1989 sp
= smk_import(value
, size
);
1993 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1994 nsp
->smk_inode
= sp
;
1995 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
1999 * The rest of the Smack xattrs are only on sockets.
2001 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2004 sock
= SOCKET_I(inode
);
2005 if (sock
== NULL
|| sock
->sk
== NULL
)
2008 ssp
= sock
->sk
->sk_security
;
2010 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2012 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2014 if (sock
->sk
->sk_family
!= PF_UNIX
) {
2015 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2018 "Smack: \"%s\" netlbl error %d.\n",
2028 * smack_socket_post_create - finish socket setup
2030 * @family: protocol family
2035 * Sets the netlabel information on the socket
2037 * Returns 0 on success, and error code otherwise
2039 static int smack_socket_post_create(struct socket
*sock
, int family
,
2040 int type
, int protocol
, int kern
)
2042 if (family
!= PF_INET
|| sock
->sk
== NULL
)
2045 * Set the outbound netlbl.
2047 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2051 * smack_socket_connect - connect access check
2053 * @sap: the other end
2054 * @addrlen: size of sap
2056 * Verifies that a connection may be possible
2058 * Returns 0 on success, and error code otherwise
2060 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2063 if (sock
->sk
== NULL
|| sock
->sk
->sk_family
!= PF_INET
)
2065 if (addrlen
< sizeof(struct sockaddr_in
))
2068 return smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2072 * smack_flags_to_may - convert S_ to MAY_ values
2073 * @flags: the S_ value
2075 * Returns the equivalent MAY_ value
2077 static int smack_flags_to_may(int flags
)
2081 if (flags
& S_IRUGO
)
2083 if (flags
& S_IWUGO
)
2085 if (flags
& S_IXUGO
)
2092 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2097 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2099 msg
->security
= smk_of_current();
2104 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2107 * Clears the blob pointer
2109 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2111 msg
->security
= NULL
;
2115 * smack_of_shm - the smack pointer for the shm
2118 * Returns a pointer to the smack value
2120 static char *smack_of_shm(struct shmid_kernel
*shp
)
2122 return (char *)shp
->shm_perm
.security
;
2126 * smack_shm_alloc_security - Set the security blob for shm
2131 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2133 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2135 isp
->security
= smk_of_current();
2140 * smack_shm_free_security - Clear the security blob for shm
2143 * Clears the blob pointer
2145 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2147 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2149 isp
->security
= NULL
;
2153 * smk_curacc_shm : check if current has access on shm
2155 * @access : access requested
2157 * Returns 0 if current has the requested access, error code otherwise
2159 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2161 char *ssp
= smack_of_shm(shp
);
2162 struct smk_audit_info ad
;
2165 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2166 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2168 return smk_curacc(ssp
, access
, &ad
);
2172 * smack_shm_associate - Smack access check for shm
2174 * @shmflg: access requested
2176 * Returns 0 if current has the requested access, error code otherwise
2178 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2182 may
= smack_flags_to_may(shmflg
);
2183 return smk_curacc_shm(shp
, may
);
2187 * smack_shm_shmctl - Smack access check for shm
2189 * @cmd: what it wants to do
2191 * Returns 0 if current has the requested access, error code otherwise
2193 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2206 may
= MAY_READWRITE
;
2211 * System level information.
2217 return smk_curacc_shm(shp
, may
);
2221 * smack_shm_shmat - Smack access for shmat
2224 * @shmflg: access requested
2226 * Returns 0 if current has the requested access, error code otherwise
2228 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2233 may
= smack_flags_to_may(shmflg
);
2234 return smk_curacc_shm(shp
, may
);
2238 * smack_of_sem - the smack pointer for the sem
2241 * Returns a pointer to the smack value
2243 static char *smack_of_sem(struct sem_array
*sma
)
2245 return (char *)sma
->sem_perm
.security
;
2249 * smack_sem_alloc_security - Set the security blob for sem
2254 static int smack_sem_alloc_security(struct sem_array
*sma
)
2256 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2258 isp
->security
= smk_of_current();
2263 * smack_sem_free_security - Clear the security blob for sem
2266 * Clears the blob pointer
2268 static void smack_sem_free_security(struct sem_array
*sma
)
2270 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2272 isp
->security
= NULL
;
2276 * smk_curacc_sem : check if current has access on sem
2278 * @access : access requested
2280 * Returns 0 if current has the requested access, error code otherwise
2282 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2284 char *ssp
= smack_of_sem(sma
);
2285 struct smk_audit_info ad
;
2288 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2289 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2291 return smk_curacc(ssp
, access
, &ad
);
2295 * smack_sem_associate - Smack access check for sem
2297 * @semflg: access requested
2299 * Returns 0 if current has the requested access, error code otherwise
2301 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2305 may
= smack_flags_to_may(semflg
);
2306 return smk_curacc_sem(sma
, may
);
2310 * smack_sem_shmctl - Smack access check for sem
2312 * @cmd: what it wants to do
2314 * Returns 0 if current has the requested access, error code otherwise
2316 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2334 may
= MAY_READWRITE
;
2339 * System level information
2346 return smk_curacc_sem(sma
, may
);
2350 * smack_sem_semop - Smack checks of semaphore operations
2356 * Treated as read and write in all cases.
2358 * Returns 0 if access is allowed, error code otherwise
2360 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2361 unsigned nsops
, int alter
)
2363 return smk_curacc_sem(sma
, MAY_READWRITE
);
2367 * smack_msg_alloc_security - Set the security blob for msg
2372 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2374 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2376 kisp
->security
= smk_of_current();
2381 * smack_msg_free_security - Clear the security blob for msg
2384 * Clears the blob pointer
2386 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2388 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2390 kisp
->security
= NULL
;
2394 * smack_of_msq - the smack pointer for the msq
2397 * Returns a pointer to the smack value
2399 static char *smack_of_msq(struct msg_queue
*msq
)
2401 return (char *)msq
->q_perm
.security
;
2405 * smk_curacc_msq : helper to check if current has access on msq
2407 * @access : access requested
2409 * return 0 if current has access, error otherwise
2411 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2413 char *msp
= smack_of_msq(msq
);
2414 struct smk_audit_info ad
;
2417 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2418 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2420 return smk_curacc(msp
, access
, &ad
);
2424 * smack_msg_queue_associate - Smack access check for msg_queue
2426 * @msqflg: access requested
2428 * Returns 0 if current has the requested access, error code otherwise
2430 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2434 may
= smack_flags_to_may(msqflg
);
2435 return smk_curacc_msq(msq
, may
);
2439 * smack_msg_queue_msgctl - Smack access check for msg_queue
2441 * @cmd: what it wants to do
2443 * Returns 0 if current has the requested access, error code otherwise
2445 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2456 may
= MAY_READWRITE
;
2461 * System level information
2468 return smk_curacc_msq(msq
, may
);
2472 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2475 * @msqflg: access requested
2477 * Returns 0 if current has the requested access, error code otherwise
2479 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2484 may
= smack_flags_to_may(msqflg
);
2485 return smk_curacc_msq(msq
, may
);
2489 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2496 * Returns 0 if current has read and write access, error code otherwise
2498 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2499 struct task_struct
*target
, long type
, int mode
)
2501 return smk_curacc_msq(msq
, MAY_READWRITE
);
2505 * smack_ipc_permission - Smack access for ipc_permission()
2506 * @ipp: the object permissions
2507 * @flag: access requested
2509 * Returns 0 if current has read and write access, error code otherwise
2511 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2513 char *isp
= ipp
->security
;
2514 int may
= smack_flags_to_may(flag
);
2515 struct smk_audit_info ad
;
2518 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2519 ad
.a
.u
.ipc_id
= ipp
->id
;
2521 return smk_curacc(isp
, may
, &ad
);
2525 * smack_ipc_getsecid - Extract smack security id
2526 * @ipp: the object permissions
2527 * @secid: where result will be saved
2529 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2531 char *smack
= ipp
->security
;
2533 *secid
= smack_to_secid(smack
);
2537 * smack_d_instantiate - Make sure the blob is correct on an inode
2538 * @opt_dentry: dentry where inode will be attached
2539 * @inode: the object
2541 * Set the inode's security blob if it hasn't been done already.
2543 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2545 struct super_block
*sbp
;
2546 struct superblock_smack
*sbsp
;
2547 struct inode_smack
*isp
;
2548 char *csp
= smk_of_current();
2551 char trattr
[TRANS_TRUE_SIZE
];
2558 isp
= inode
->i_security
;
2560 mutex_lock(&isp
->smk_lock
);
2562 * If the inode is already instantiated
2563 * take the quick way out
2565 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2569 sbsp
= sbp
->s_security
;
2571 * We're going to use the superblock default label
2572 * if there's no label on the file.
2574 final
= sbsp
->smk_default
;
2577 * If this is the root inode the superblock
2578 * may be in the process of initialization.
2579 * If that is the case use the root value out
2580 * of the superblock.
2582 if (opt_dentry
->d_parent
== opt_dentry
) {
2583 isp
->smk_inode
= sbsp
->smk_root
;
2584 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2589 * This is pretty hackish.
2590 * Casey says that we shouldn't have to do
2591 * file system specific code, but it does help
2592 * with keeping it simple.
2594 switch (sbp
->s_magic
) {
2597 * Casey says that it's a little embarrassing
2598 * that the smack file system doesn't do
2599 * extended attributes.
2601 final
= smack_known_star
.smk_known
;
2605 * Casey says pipes are easy (?)
2607 final
= smack_known_star
.smk_known
;
2609 case DEVPTS_SUPER_MAGIC
:
2611 * devpts seems content with the label of the task.
2612 * Programs that change smack have to treat the
2619 * Socket access is controlled by the socket
2620 * structures associated with the task involved.
2622 final
= smack_known_star
.smk_known
;
2624 case PROC_SUPER_MAGIC
:
2626 * Casey says procfs appears not to care.
2627 * The superblock default suffices.
2632 * Device labels should come from the filesystem,
2633 * but watch out, because they're volitile,
2634 * getting recreated on every reboot.
2636 final
= smack_known_star
.smk_known
;
2640 * If a smack value has been set we want to use it,
2641 * but since tmpfs isn't giving us the opportunity
2642 * to set mount options simulate setting the
2643 * superblock default.
2647 * This isn't an understood special case.
2648 * Get the value from the xattr.
2652 * UNIX domain sockets use lower level socket data.
2654 if (S_ISSOCK(inode
->i_mode
)) {
2655 final
= smack_known_star
.smk_known
;
2659 * No xattr support means, alas, no SMACK label.
2660 * Use the aforeapplied default.
2661 * It would be curious if the label of the task
2662 * does not match that assigned.
2664 if (inode
->i_op
->getxattr
== NULL
)
2667 * Get the dentry for xattr.
2669 dp
= dget(opt_dentry
);
2670 fetched
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
2671 if (fetched
!= NULL
) {
2673 if (S_ISDIR(inode
->i_mode
)) {
2675 inode
->i_op
->getxattr(dp
,
2676 XATTR_NAME_SMACKTRANSMUTE
,
2677 trattr
, TRANS_TRUE_SIZE
);
2678 if (strncmp(trattr
, TRANS_TRUE
,
2679 TRANS_TRUE_SIZE
) == 0)
2680 transflag
= SMK_INODE_TRANSMUTE
;
2683 isp
->smk_task
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
2684 isp
->smk_mmap
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
2691 isp
->smk_inode
= csp
;
2693 isp
->smk_inode
= final
;
2695 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
2698 mutex_unlock(&isp
->smk_lock
);
2703 * smack_getprocattr - Smack process attribute access
2704 * @p: the object task
2705 * @name: the name of the attribute in /proc/.../attr
2706 * @value: where to put the result
2708 * Places a copy of the task Smack into value
2710 * Returns the length of the smack label or an error code
2712 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2717 if (strcmp(name
, "current") != 0)
2720 cp
= kstrdup(smk_of_task(task_security(p
)), GFP_KERNEL
);
2730 * smack_setprocattr - Smack process attribute setting
2731 * @p: the object task
2732 * @name: the name of the attribute in /proc/.../attr
2733 * @value: the value to set
2734 * @size: the size of the value
2736 * Sets the Smack value of the task. Only setting self
2737 * is permitted and only with privilege
2739 * Returns the length of the smack label or an error code
2741 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2742 void *value
, size_t size
)
2745 struct task_smack
*tsp
;
2746 struct task_smack
*oldtsp
;
2751 * Changing another process' Smack value is too dangerous
2752 * and supports no sane use case.
2757 if (!capable(CAP_MAC_ADMIN
))
2760 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2763 if (strcmp(name
, "current") != 0)
2766 newsmack
= smk_import(value
, size
);
2767 if (newsmack
== NULL
)
2771 * No process is ever allowed the web ("@") label.
2773 if (newsmack
== smack_known_web
.smk_known
)
2776 oldtsp
= p
->cred
->security
;
2777 new = prepare_creds();
2781 tsp
= new_task_smack(newsmack
, oldtsp
->smk_forked
, GFP_KERNEL
);
2786 rc
= smk_copy_rules(&tsp
->smk_rules
, &oldtsp
->smk_rules
, GFP_KERNEL
);
2790 new->security
= tsp
;
2796 * smack_unix_stream_connect - Smack access on UDS
2798 * @other: the other sock
2801 * Return 0 if a subject with the smack of sock could access
2802 * an object with the smack of other, otherwise an error code
2804 static int smack_unix_stream_connect(struct sock
*sock
,
2805 struct sock
*other
, struct sock
*newsk
)
2807 struct socket_smack
*ssp
= sock
->sk_security
;
2808 struct socket_smack
*osp
= other
->sk_security
;
2809 struct socket_smack
*nsp
= newsk
->sk_security
;
2810 struct smk_audit_info ad
;
2813 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2814 smk_ad_setfield_u_net_sk(&ad
, other
);
2816 if (!capable(CAP_MAC_OVERRIDE
))
2817 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
2820 * Cross reference the peer labels for SO_PEERSEC.
2823 nsp
->smk_packet
= ssp
->smk_out
;
2824 ssp
->smk_packet
= osp
->smk_out
;
2831 * smack_unix_may_send - Smack access on UDS
2833 * @other: the other socket
2835 * Return 0 if a subject with the smack of sock could access
2836 * an object with the smack of other, otherwise an error code
2838 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2840 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2841 struct socket_smack
*osp
= other
->sk
->sk_security
;
2842 struct smk_audit_info ad
;
2845 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2846 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2848 if (!capable(CAP_MAC_OVERRIDE
))
2849 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
2855 * smack_socket_sendmsg - Smack check based on destination host
2858 * @size: the size of the message
2860 * Return 0 if the current subject can write to the destination
2861 * host. This is only a question if the destination is a single
2864 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
2867 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
2870 * Perfectly reasonable for this to be NULL
2872 if (sip
== NULL
|| sip
->sin_family
!= AF_INET
)
2875 return smack_netlabel_send(sock
->sk
, sip
);
2879 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2880 * @sap: netlabel secattr
2881 * @ssp: socket security information
2883 * Returns a pointer to a Smack label found on the label list.
2885 static char *smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
2886 struct socket_smack
*ssp
)
2888 struct smack_known
*skp
;
2889 char smack
[SMK_LABELLEN
];
2893 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
2895 * Looks like a CIPSO packet.
2896 * If there are flags but no level netlabel isn't
2897 * behaving the way we expect it to.
2899 * Get the categories, if any
2900 * Without guidance regarding the smack value
2901 * for the packet fall back on the network
2904 memset(smack
, '\0', SMK_LABELLEN
);
2905 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2907 pcat
= netlbl_secattr_catmap_walk(
2908 sap
->attr
.mls
.cat
, pcat
+ 1);
2911 smack_catset_bit(pcat
, smack
);
2914 * If it is CIPSO using smack direct mapping
2915 * we are already done. WeeHee.
2917 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2919 * The label sent is usually on the label list.
2921 * If it is not we may still want to allow the
2924 * If the recipient is accepting all packets
2925 * because it is using the star ("*") label
2926 * for SMACK64IPIN provide the web ("@") label
2927 * so that a directed response will succeed.
2928 * This is not very correct from a MAC point
2929 * of view, but gets around the problem that
2930 * locking prevents adding the newly discovered
2931 * label to the list.
2932 * The case where the recipient is not using
2933 * the star label should obviously fail.
2934 * The easy way to do this is to provide the
2935 * star label as the subject label.
2937 skp
= smk_find_entry(smack
);
2939 return skp
->smk_known
;
2941 ssp
->smk_in
== smack_known_star
.smk_known
)
2942 return smack_known_web
.smk_known
;
2943 return smack_known_star
.smk_known
;
2946 * Look it up in the supplied table if it is not
2949 sp
= smack_from_cipso(sap
->attr
.mls
.lvl
, smack
);
2952 if (ssp
!= NULL
&& ssp
->smk_in
== smack_known_star
.smk_known
)
2953 return smack_known_web
.smk_known
;
2954 return smack_known_star
.smk_known
;
2956 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
2958 * Looks like a fallback, which gives us a secid.
2960 sp
= smack_from_secid(sap
->attr
.secid
);
2962 * This has got to be a bug because it is
2963 * impossible to specify a fallback without
2964 * specifying the label, which will ensure
2965 * it has a secid, and the only way to get a
2966 * secid is from a fallback.
2972 * Without guidance regarding the smack value
2973 * for the packet fall back on the network
2976 return smack_net_ambient
;
2980 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2984 * Returns 0 if the packet should be delivered, an error code otherwise
2986 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2988 struct netlbl_lsm_secattr secattr
;
2989 struct socket_smack
*ssp
= sk
->sk_security
;
2992 struct smk_audit_info ad
;
2993 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2997 * Translate what netlabel gave us.
2999 netlbl_secattr_init(&secattr
);
3001 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3003 csp
= smack_from_secattr(&secattr
, ssp
);
3005 csp
= smack_net_ambient
;
3007 netlbl_secattr_destroy(&secattr
);
3010 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
3011 ad
.a
.u
.net
.family
= sk
->sk_family
;
3012 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
3013 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3016 * Receiving a packet requires that the other end
3017 * be able to write here. Read access is not required.
3018 * This is the simplist possible security model
3021 rc
= smk_access(csp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3023 netlbl_skbuff_err(skb
, rc
, 0);
3028 * smack_socket_getpeersec_stream - pull in packet label
3030 * @optval: user's destination
3031 * @optlen: size thereof
3034 * returns zero on success, an error code otherwise
3036 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3037 char __user
*optval
,
3038 int __user
*optlen
, unsigned len
)
3040 struct socket_smack
*ssp
;
3045 ssp
= sock
->sk
->sk_security
;
3046 if (ssp
->smk_packet
!= NULL
) {
3047 rcp
= ssp
->smk_packet
;
3048 slen
= strlen(rcp
) + 1;
3053 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3056 if (put_user(slen
, optlen
) != 0)
3064 * smack_socket_getpeersec_dgram - pull in packet label
3065 * @sock: the peer socket
3067 * @secid: pointer to where to put the secid of the packet
3069 * Sets the netlabel socket state on sk from parent
3071 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
3072 struct sk_buff
*skb
, u32
*secid
)
3075 struct netlbl_lsm_secattr secattr
;
3076 struct socket_smack
*ssp
= NULL
;
3078 int family
= PF_UNSPEC
;
3079 u32 s
= 0; /* 0 is the invalid secid */
3083 if (skb
->protocol
== htons(ETH_P_IP
))
3085 else if (skb
->protocol
== htons(ETH_P_IPV6
))
3088 if (family
== PF_UNSPEC
&& sock
!= NULL
)
3089 family
= sock
->sk
->sk_family
;
3091 if (family
== PF_UNIX
) {
3092 ssp
= sock
->sk
->sk_security
;
3093 s
= smack_to_secid(ssp
->smk_out
);
3094 } else if (family
== PF_INET
|| family
== PF_INET6
) {
3096 * Translate what netlabel gave us.
3098 if (sock
!= NULL
&& sock
->sk
!= NULL
)
3099 ssp
= sock
->sk
->sk_security
;
3100 netlbl_secattr_init(&secattr
);
3101 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3103 sp
= smack_from_secattr(&secattr
, ssp
);
3104 s
= smack_to_secid(sp
);
3106 netlbl_secattr_destroy(&secattr
);
3115 * smack_sock_graft - Initialize a newly created socket with an existing sock
3117 * @parent: parent socket
3119 * Set the smk_{in,out} state of an existing sock based on the process that
3120 * is creating the new socket.
3122 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3124 struct socket_smack
*ssp
;
3127 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3130 ssp
= sk
->sk_security
;
3131 ssp
->smk_in
= ssp
->smk_out
= smk_of_current();
3132 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3136 * smack_inet_conn_request - Smack access check on connect
3137 * @sk: socket involved
3141 * Returns 0 if a task with the packet label could write to
3142 * the socket, otherwise an error code
3144 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3145 struct request_sock
*req
)
3147 u16 family
= sk
->sk_family
;
3148 struct socket_smack
*ssp
= sk
->sk_security
;
3149 struct netlbl_lsm_secattr secattr
;
3150 struct sockaddr_in addr
;
3154 struct smk_audit_info ad
;
3156 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3157 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
3160 netlbl_secattr_init(&secattr
);
3161 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3163 sp
= smack_from_secattr(&secattr
, ssp
);
3165 sp
= smack_known_huh
.smk_known
;
3166 netlbl_secattr_destroy(&secattr
);
3169 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
3170 ad
.a
.u
.net
.family
= family
;
3171 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
3172 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3175 * Receiving a packet requires that the other end be able to write
3176 * here. Read access is not required.
3178 rc
= smk_access(sp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3183 * Save the peer's label in the request_sock so we can later setup
3184 * smk_packet in the child socket so that SO_PEERCRED can report it.
3186 req
->peer_secid
= smack_to_secid(sp
);
3189 * We need to decide if we want to label the incoming connection here
3190 * if we do we only need to label the request_sock and the stack will
3191 * propagate the wire-label to the sock when it is created.
3194 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3196 if (smack_host_label(&addr
) == NULL
) {
3198 netlbl_secattr_init(&secattr
);
3199 smack_to_secattr(sp
, &secattr
);
3200 rc
= netlbl_req_setattr(req
, &secattr
);
3201 netlbl_secattr_destroy(&secattr
);
3204 netlbl_req_delattr(req
);
3211 * smack_inet_csk_clone - Copy the connection information to the new socket
3212 * @sk: the new socket
3213 * @req: the connection's request_sock
3215 * Transfer the connection's peer label to the newly created socket.
3217 static void smack_inet_csk_clone(struct sock
*sk
,
3218 const struct request_sock
*req
)
3220 struct socket_smack
*ssp
= sk
->sk_security
;
3222 if (req
->peer_secid
!= 0)
3223 ssp
->smk_packet
= smack_from_secid(req
->peer_secid
);
3225 ssp
->smk_packet
= NULL
;
3229 * Key management security hooks
3231 * Casey has not tested key support very heavily.
3232 * The permission check is most likely too restrictive.
3233 * If you care about keys please have a look.
3238 * smack_key_alloc - Set the key security blob
3240 * @cred: the credentials to use
3243 * No allocation required
3247 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3248 unsigned long flags
)
3250 key
->security
= smk_of_task(cred
->security
);
3255 * smack_key_free - Clear the key security blob
3258 * Clear the blob pointer
3260 static void smack_key_free(struct key
*key
)
3262 key
->security
= NULL
;
3266 * smack_key_permission - Smack access on a key
3267 * @key_ref: gets to the object
3268 * @cred: the credentials to use
3271 * Return 0 if the task has read and write to the object,
3272 * an error code otherwise
3274 static int smack_key_permission(key_ref_t key_ref
,
3275 const struct cred
*cred
, key_perm_t perm
)
3278 struct smk_audit_info ad
;
3279 char *tsp
= smk_of_task(cred
->security
);
3281 keyp
= key_ref_to_ptr(key_ref
);
3285 * If the key hasn't been initialized give it access so that
3288 if (keyp
->security
== NULL
)
3291 * This should not occur
3296 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3297 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3298 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
3300 return smk_access(tsp
, keyp
->security
,
3301 MAY_READWRITE
, &ad
);
3303 #endif /* CONFIG_KEYS */
3308 * Audit requires a unique representation of each Smack specific
3309 * rule. This unique representation is used to distinguish the
3310 * object to be audited from remaining kernel objects and also
3311 * works as a glue between the audit hooks.
3313 * Since repository entries are added but never deleted, we'll use
3314 * the smack_known label address related to the given audit rule as
3315 * the needed unique representation. This also better fits the smack
3316 * model where nearly everything is a label.
3321 * smack_audit_rule_init - Initialize a smack audit rule
3322 * @field: audit rule fields given from user-space (audit.h)
3323 * @op: required testing operator (=, !=, >, <, ...)
3324 * @rulestr: smack label to be audited
3325 * @vrule: pointer to save our own audit rule representation
3327 * Prepare to audit cases where (@field @op @rulestr) is true.
3328 * The label to be audited is created if necessay.
3330 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
3332 char **rule
= (char **)vrule
;
3335 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3338 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
3341 *rule
= smk_import(rulestr
, 0);
3347 * smack_audit_rule_known - Distinguish Smack audit rules
3348 * @krule: rule of interest, in Audit kernel representation format
3350 * This is used to filter Smack rules from remaining Audit ones.
3351 * If it's proved that this rule belongs to us, the
3352 * audit_rule_match hook will be called to do the final judgement.
3354 static int smack_audit_rule_known(struct audit_krule
*krule
)
3356 struct audit_field
*f
;
3359 for (i
= 0; i
< krule
->field_count
; i
++) {
3360 f
= &krule
->fields
[i
];
3362 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
3370 * smack_audit_rule_match - Audit given object ?
3371 * @secid: security id for identifying the object to test
3372 * @field: audit rule flags given from user-space
3373 * @op: required testing operator
3374 * @vrule: smack internal rule presentation
3375 * @actx: audit context associated with the check
3377 * The core Audit hook. It's used to take the decision of
3378 * whether to audit or not to audit a given object.
3380 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
3381 struct audit_context
*actx
)
3387 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
3388 "Smack: missing rule\n");
3392 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3395 smack
= smack_from_secid(secid
);
3398 * No need to do string comparisons. If a match occurs,
3399 * both pointers will point to the same smack_known
3402 if (op
== Audit_equal
)
3403 return (rule
== smack
);
3404 if (op
== Audit_not_equal
)
3405 return (rule
!= smack
);
3411 * smack_audit_rule_free - free smack rule representation
3412 * @vrule: rule to be freed.
3414 * No memory was allocated.
3416 static void smack_audit_rule_free(void *vrule
)
3421 #endif /* CONFIG_AUDIT */
3424 * smack_secid_to_secctx - return the smack label for a secid
3425 * @secid: incoming integer
3426 * @secdata: destination
3427 * @seclen: how long it is
3429 * Exists for networking code.
3431 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3433 char *sp
= smack_from_secid(secid
);
3437 *seclen
= strlen(sp
);
3442 * smack_secctx_to_secid - return the secid for a smack label
3443 * @secdata: smack label
3444 * @seclen: how long result is
3445 * @secid: outgoing integer
3447 * Exists for audit and networking code.
3449 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3451 *secid
= smack_to_secid(secdata
);
3456 * smack_release_secctx - don't do anything.
3460 * Exists to make sure nothing gets done, and properly
3462 static void smack_release_secctx(char *secdata
, u32 seclen
)
3466 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3468 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
3471 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3473 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
3476 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
3479 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
3487 struct security_operations smack_ops
= {
3490 .ptrace_access_check
= smack_ptrace_access_check
,
3491 .ptrace_traceme
= smack_ptrace_traceme
,
3492 .syslog
= smack_syslog
,
3494 .sb_alloc_security
= smack_sb_alloc_security
,
3495 .sb_free_security
= smack_sb_free_security
,
3496 .sb_copy_data
= smack_sb_copy_data
,
3497 .sb_kern_mount
= smack_sb_kern_mount
,
3498 .sb_statfs
= smack_sb_statfs
,
3499 .sb_mount
= smack_sb_mount
,
3500 .sb_umount
= smack_sb_umount
,
3502 .bprm_set_creds
= smack_bprm_set_creds
,
3503 .bprm_committing_creds
= smack_bprm_committing_creds
,
3504 .bprm_secureexec
= smack_bprm_secureexec
,
3506 .inode_alloc_security
= smack_inode_alloc_security
,
3507 .inode_free_security
= smack_inode_free_security
,
3508 .inode_init_security
= smack_inode_init_security
,
3509 .inode_link
= smack_inode_link
,
3510 .inode_unlink
= smack_inode_unlink
,
3511 .inode_rmdir
= smack_inode_rmdir
,
3512 .inode_rename
= smack_inode_rename
,
3513 .inode_permission
= smack_inode_permission
,
3514 .inode_setattr
= smack_inode_setattr
,
3515 .inode_getattr
= smack_inode_getattr
,
3516 .inode_setxattr
= smack_inode_setxattr
,
3517 .inode_post_setxattr
= smack_inode_post_setxattr
,
3518 .inode_getxattr
= smack_inode_getxattr
,
3519 .inode_removexattr
= smack_inode_removexattr
,
3520 .inode_getsecurity
= smack_inode_getsecurity
,
3521 .inode_setsecurity
= smack_inode_setsecurity
,
3522 .inode_listsecurity
= smack_inode_listsecurity
,
3523 .inode_getsecid
= smack_inode_getsecid
,
3525 .file_permission
= smack_file_permission
,
3526 .file_alloc_security
= smack_file_alloc_security
,
3527 .file_free_security
= smack_file_free_security
,
3528 .file_ioctl
= smack_file_ioctl
,
3529 .file_lock
= smack_file_lock
,
3530 .file_fcntl
= smack_file_fcntl
,
3531 .file_mmap
= smack_file_mmap
,
3532 .file_set_fowner
= smack_file_set_fowner
,
3533 .file_send_sigiotask
= smack_file_send_sigiotask
,
3534 .file_receive
= smack_file_receive
,
3536 .dentry_open
= smack_dentry_open
,
3538 .cred_alloc_blank
= smack_cred_alloc_blank
,
3539 .cred_free
= smack_cred_free
,
3540 .cred_prepare
= smack_cred_prepare
,
3541 .cred_transfer
= smack_cred_transfer
,
3542 .kernel_act_as
= smack_kernel_act_as
,
3543 .kernel_create_files_as
= smack_kernel_create_files_as
,
3544 .task_setpgid
= smack_task_setpgid
,
3545 .task_getpgid
= smack_task_getpgid
,
3546 .task_getsid
= smack_task_getsid
,
3547 .task_getsecid
= smack_task_getsecid
,
3548 .task_setnice
= smack_task_setnice
,
3549 .task_setioprio
= smack_task_setioprio
,
3550 .task_getioprio
= smack_task_getioprio
,
3551 .task_setscheduler
= smack_task_setscheduler
,
3552 .task_getscheduler
= smack_task_getscheduler
,
3553 .task_movememory
= smack_task_movememory
,
3554 .task_kill
= smack_task_kill
,
3555 .task_wait
= smack_task_wait
,
3556 .task_to_inode
= smack_task_to_inode
,
3558 .ipc_permission
= smack_ipc_permission
,
3559 .ipc_getsecid
= smack_ipc_getsecid
,
3561 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
3562 .msg_msg_free_security
= smack_msg_msg_free_security
,
3564 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
3565 .msg_queue_free_security
= smack_msg_queue_free_security
,
3566 .msg_queue_associate
= smack_msg_queue_associate
,
3567 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
3568 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
3569 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
3571 .shm_alloc_security
= smack_shm_alloc_security
,
3572 .shm_free_security
= smack_shm_free_security
,
3573 .shm_associate
= smack_shm_associate
,
3574 .shm_shmctl
= smack_shm_shmctl
,
3575 .shm_shmat
= smack_shm_shmat
,
3577 .sem_alloc_security
= smack_sem_alloc_security
,
3578 .sem_free_security
= smack_sem_free_security
,
3579 .sem_associate
= smack_sem_associate
,
3580 .sem_semctl
= smack_sem_semctl
,
3581 .sem_semop
= smack_sem_semop
,
3583 .d_instantiate
= smack_d_instantiate
,
3585 .getprocattr
= smack_getprocattr
,
3586 .setprocattr
= smack_setprocattr
,
3588 .unix_stream_connect
= smack_unix_stream_connect
,
3589 .unix_may_send
= smack_unix_may_send
,
3591 .socket_post_create
= smack_socket_post_create
,
3592 .socket_connect
= smack_socket_connect
,
3593 .socket_sendmsg
= smack_socket_sendmsg
,
3594 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
3595 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
3596 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
3597 .sk_alloc_security
= smack_sk_alloc_security
,
3598 .sk_free_security
= smack_sk_free_security
,
3599 .sock_graft
= smack_sock_graft
,
3600 .inet_conn_request
= smack_inet_conn_request
,
3601 .inet_csk_clone
= smack_inet_csk_clone
,
3603 /* key management security hooks */
3605 .key_alloc
= smack_key_alloc
,
3606 .key_free
= smack_key_free
,
3607 .key_permission
= smack_key_permission
,
3608 #endif /* CONFIG_KEYS */
3612 .audit_rule_init
= smack_audit_rule_init
,
3613 .audit_rule_known
= smack_audit_rule_known
,
3614 .audit_rule_match
= smack_audit_rule_match
,
3615 .audit_rule_free
= smack_audit_rule_free
,
3616 #endif /* CONFIG_AUDIT */
3618 .secid_to_secctx
= smack_secid_to_secctx
,
3619 .secctx_to_secid
= smack_secctx_to_secid
,
3620 .release_secctx
= smack_release_secctx
,
3621 .inode_notifysecctx
= smack_inode_notifysecctx
,
3622 .inode_setsecctx
= smack_inode_setsecctx
,
3623 .inode_getsecctx
= smack_inode_getsecctx
,
3627 static __init
void init_smack_know_list(void)
3629 list_add(&smack_known_huh
.list
, &smack_known_list
);
3630 list_add(&smack_known_hat
.list
, &smack_known_list
);
3631 list_add(&smack_known_star
.list
, &smack_known_list
);
3632 list_add(&smack_known_floor
.list
, &smack_known_list
);
3633 list_add(&smack_known_invalid
.list
, &smack_known_list
);
3634 list_add(&smack_known_web
.list
, &smack_known_list
);
3638 * smack_init - initialize the smack system
3642 static __init
int smack_init(void)
3645 struct task_smack
*tsp
;
3647 if (!security_module_enable(&smack_ops
))
3650 tsp
= new_task_smack(smack_known_floor
.smk_known
,
3651 smack_known_floor
.smk_known
, GFP_KERNEL
);
3655 printk(KERN_INFO
"Smack: Initializing.\n");
3658 * Set the security state for the initial task.
3660 cred
= (struct cred
*) current
->cred
;
3661 cred
->security
= tsp
;
3663 /* initialize the smack_know_list */
3664 init_smack_know_list();
3668 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
3669 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
3670 spin_lock_init(&smack_known_star
.smk_cipsolock
);
3671 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
3672 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
3677 if (register_security(&smack_ops
))
3678 panic("smack: Unable to register with kernel.\n");
3684 * Smack requires early initialization in order to label
3685 * all processes and objects when they are created.
3687 security_initcall(smack_init
);