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 <ext-jarkko.2.sakkinen@nokia.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.moore@hp.com>
13 * Copyright (C) 2010 Nokia Corporation
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2,
17 * as published by the Free Software Foundation.
20 #include <linux/xattr.h>
21 #include <linux/pagemap.h>
22 #include <linux/mount.h>
23 #include <linux/stat.h>
25 #include <asm/ioctls.h>
27 #include <linux/tcp.h>
28 #include <linux/udp.h>
29 #include <linux/slab.h>
30 #include <linux/mutex.h>
31 #include <linux/pipe_fs_i.h>
32 #include <net/netlabel.h>
33 #include <net/cipso_ipv4.h>
34 #include <linux/audit.h>
35 #include <linux/magic.h>
36 #include <linux/dcache.h>
39 #define task_security(task) (task_cred_xxx((task), security))
41 #define TRANS_TRUE "TRUE"
42 #define TRANS_TRUE_SIZE 4
45 * smk_fetch - Fetch the smack label from a file.
46 * @ip: a pointer to the inode
47 * @dp: a pointer to the dentry
49 * Returns a pointer to the master list entry for the Smack label
50 * or NULL if there was no label to fetch.
52 static char *smk_fetch(const char *name
, struct inode
*ip
, struct dentry
*dp
)
55 char in
[SMK_LABELLEN
];
57 if (ip
->i_op
->getxattr
== NULL
)
60 rc
= ip
->i_op
->getxattr(dp
, name
, in
, SMK_LABELLEN
);
64 return smk_import(in
, rc
);
68 * new_inode_smack - allocate an inode security blob
69 * @smack: a pointer to the Smack label to use in the blob
71 * Returns the new blob or NULL if there's no memory available
73 struct inode_smack
*new_inode_smack(char *smack
)
75 struct inode_smack
*isp
;
77 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
81 isp
->smk_inode
= smack
;
83 mutex_init(&isp
->smk_lock
);
89 * new_task_smack - allocate a task security blob
90 * @smack: a pointer to the Smack label to use in the blob
92 * Returns the new blob or NULL if there's no memory available
94 static struct task_smack
*new_task_smack(char *task
, char *forked
, gfp_t gfp
)
96 struct task_smack
*tsp
;
98 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
102 tsp
->smk_task
= task
;
103 tsp
->smk_forked
= forked
;
104 INIT_LIST_HEAD(&tsp
->smk_rules
);
105 mutex_init(&tsp
->smk_rules_lock
);
111 * smk_copy_rules - copy a rule set
112 * @nhead - new rules header pointer
113 * @ohead - old rules header pointer
115 * Returns 0 on success, -ENOMEM on error
117 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
120 struct smack_rule
*nrp
;
121 struct smack_rule
*orp
;
124 INIT_LIST_HEAD(nhead
);
126 list_for_each_entry_rcu(orp
, ohead
, list
) {
127 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
133 list_add_rcu(&nrp
->list
, nhead
);
140 * We he, that is fun!
144 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
145 * @ctp: child task pointer
146 * @mode: ptrace attachment mode
148 * Returns 0 if access is OK, an error code otherwise
150 * Do the capability checks, and require read and write.
152 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
155 struct smk_audit_info ad
;
158 rc
= cap_ptrace_access_check(ctp
, mode
);
162 tsp
= smk_of_task(task_security(ctp
));
163 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
164 smk_ad_setfield_u_tsk(&ad
, ctp
);
166 rc
= smk_curacc(tsp
, MAY_READWRITE
, &ad
);
171 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
172 * @ptp: parent task pointer
174 * Returns 0 if access is OK, an error code otherwise
176 * Do the capability checks, and require read and write.
178 static int smack_ptrace_traceme(struct task_struct
*ptp
)
181 struct smk_audit_info ad
;
184 rc
= cap_ptrace_traceme(ptp
);
188 tsp
= smk_of_task(task_security(ptp
));
189 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
190 smk_ad_setfield_u_tsk(&ad
, ptp
);
192 rc
= smk_curacc(tsp
, MAY_READWRITE
, &ad
);
197 * smack_syslog - Smack approval on syslog
198 * @type: message type
200 * Require that the task has the floor label
202 * Returns 0 on success, error code otherwise.
204 static int smack_syslog(int typefrom_file
)
207 char *sp
= smk_of_current();
209 if (capable(CAP_MAC_OVERRIDE
))
212 if (sp
!= smack_known_floor
.smk_known
)
224 * smack_sb_alloc_security - allocate a superblock blob
225 * @sb: the superblock getting the blob
227 * Returns 0 on success or -ENOMEM on error.
229 static int smack_sb_alloc_security(struct super_block
*sb
)
231 struct superblock_smack
*sbsp
;
233 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
238 sbsp
->smk_root
= smack_known_floor
.smk_known
;
239 sbsp
->smk_default
= smack_known_floor
.smk_known
;
240 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
241 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
242 sbsp
->smk_initialized
= 0;
243 spin_lock_init(&sbsp
->smk_sblock
);
245 sb
->s_security
= sbsp
;
251 * smack_sb_free_security - free a superblock blob
252 * @sb: the superblock getting the blob
255 static void smack_sb_free_security(struct super_block
*sb
)
257 kfree(sb
->s_security
);
258 sb
->s_security
= NULL
;
262 * smack_sb_copy_data - copy mount options data for processing
263 * @orig: where to start
264 * @smackopts: mount options string
266 * Returns 0 on success or -ENOMEM on error.
268 * Copy the Smack specific mount options out of the mount
271 static int smack_sb_copy_data(char *orig
, char *smackopts
)
273 char *cp
, *commap
, *otheropts
, *dp
;
275 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
276 if (otheropts
== NULL
)
279 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
280 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
282 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
284 else if (strstr(cp
, SMK_FSHAT
) == cp
)
286 else if (strstr(cp
, SMK_FSROOT
) == cp
)
291 commap
= strchr(cp
, ',');
300 strcpy(orig
, otheropts
);
301 free_page((unsigned long)otheropts
);
307 * smack_sb_kern_mount - Smack specific mount processing
308 * @sb: the file system superblock
309 * @flags: the mount flags
310 * @data: the smack mount options
312 * Returns 0 on success, an error code on failure
314 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
316 struct dentry
*root
= sb
->s_root
;
317 struct inode
*inode
= root
->d_inode
;
318 struct superblock_smack
*sp
= sb
->s_security
;
319 struct inode_smack
*isp
;
324 spin_lock(&sp
->smk_sblock
);
325 if (sp
->smk_initialized
!= 0) {
326 spin_unlock(&sp
->smk_sblock
);
329 sp
->smk_initialized
= 1;
330 spin_unlock(&sp
->smk_sblock
);
332 for (op
= data
; op
!= NULL
; op
= commap
) {
333 commap
= strchr(op
, ',');
337 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
338 op
+= strlen(SMK_FSHAT
);
339 nsp
= smk_import(op
, 0);
342 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
343 op
+= strlen(SMK_FSFLOOR
);
344 nsp
= smk_import(op
, 0);
347 } else if (strncmp(op
, SMK_FSDEFAULT
,
348 strlen(SMK_FSDEFAULT
)) == 0) {
349 op
+= strlen(SMK_FSDEFAULT
);
350 nsp
= smk_import(op
, 0);
352 sp
->smk_default
= nsp
;
353 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
354 op
+= strlen(SMK_FSROOT
);
355 nsp
= smk_import(op
, 0);
362 * Initialize the root inode.
364 isp
= inode
->i_security
;
366 inode
->i_security
= new_inode_smack(sp
->smk_root
);
368 isp
->smk_inode
= sp
->smk_root
;
374 * smack_sb_statfs - Smack check on statfs
375 * @dentry: identifies the file system in question
377 * Returns 0 if current can read the floor of the filesystem,
378 * and error code otherwise
380 static int smack_sb_statfs(struct dentry
*dentry
)
382 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
384 struct smk_audit_info ad
;
386 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
387 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
389 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
394 * smack_sb_mount - Smack check for mounting
401 * Returns 0 if current can write the floor of the filesystem
402 * being mounted on, an error code otherwise.
404 static int smack_sb_mount(char *dev_name
, struct path
*path
,
405 char *type
, unsigned long flags
, void *data
)
407 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
408 struct smk_audit_info ad
;
410 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
411 smk_ad_setfield_u_fs_path(&ad
, *path
);
413 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
417 * smack_sb_umount - Smack check for unmounting
418 * @mnt: file system to unmount
421 * Returns 0 if current can write the floor of the filesystem
422 * being unmounted, an error code otherwise.
424 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
426 struct superblock_smack
*sbp
;
427 struct smk_audit_info ad
;
429 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
430 smk_ad_setfield_u_fs_path_dentry(&ad
, mnt
->mnt_root
);
431 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
433 sbp
= mnt
->mnt_sb
->s_security
;
434 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
, &ad
);
441 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
443 struct task_smack
*tsp
= bprm
->cred
->security
;
444 struct inode_smack
*isp
;
448 rc
= cap_bprm_set_creds(bprm
);
452 if (bprm
->cred_prepared
)
455 if (bprm
->file
== NULL
|| bprm
->file
->f_dentry
== NULL
)
458 dp
= bprm
->file
->f_dentry
;
460 if (dp
->d_inode
== NULL
)
463 isp
= dp
->d_inode
->i_security
;
465 if (isp
->smk_task
!= NULL
)
466 tsp
->smk_task
= isp
->smk_task
;
476 * smack_inode_alloc_security - allocate an inode blob
477 * @inode: the inode in need of a blob
479 * Returns 0 if it gets a blob, -ENOMEM otherwise
481 static int smack_inode_alloc_security(struct inode
*inode
)
483 inode
->i_security
= new_inode_smack(smk_of_current());
484 if (inode
->i_security
== NULL
)
490 * smack_inode_free_security - free an inode blob
491 * @inode: the inode with a blob
493 * Clears the blob pointer in inode
495 static void smack_inode_free_security(struct inode
*inode
)
497 kfree(inode
->i_security
);
498 inode
->i_security
= NULL
;
502 * smack_inode_init_security - copy out the smack from an inode
506 * @name: where to put the attribute name
507 * @value: where to put the attribute value
508 * @len: where to put the length of the attribute
510 * Returns 0 if it all works out, -ENOMEM if there's no memory
512 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
513 const struct qstr
*qstr
, char **name
,
514 void **value
, size_t *len
)
516 char *isp
= smk_of_inode(inode
);
517 char *dsp
= smk_of_inode(dir
);
521 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
528 may
= smk_access_entry(smk_of_current(), dsp
, &smack_rule_list
);
532 * If the access rule allows transmutation and
533 * the directory requests transmutation then
534 * by all means transmute.
536 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
537 smk_inode_transmutable(dir
))
540 *value
= kstrdup(isp
, GFP_KERNEL
);
546 *len
= strlen(isp
) + 1;
552 * smack_inode_link - Smack check on link
553 * @old_dentry: the existing object
555 * @new_dentry: the new object
557 * Returns 0 if access is permitted, an error code otherwise
559 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
560 struct dentry
*new_dentry
)
563 struct smk_audit_info ad
;
566 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
567 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
569 isp
= smk_of_inode(old_dentry
->d_inode
);
570 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
572 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
573 isp
= smk_of_inode(new_dentry
->d_inode
);
574 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
575 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
582 * smack_inode_unlink - Smack check on inode deletion
583 * @dir: containing directory object
584 * @dentry: file to unlink
586 * Returns 0 if current can write the containing directory
587 * and the object, error code otherwise
589 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
591 struct inode
*ip
= dentry
->d_inode
;
592 struct smk_audit_info ad
;
595 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
596 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
599 * You need write access to the thing you're unlinking
601 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
604 * You also need write access to the containing directory
606 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
607 smk_ad_setfield_u_fs_inode(&ad
, dir
);
608 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
614 * smack_inode_rmdir - Smack check on directory deletion
615 * @dir: containing directory object
616 * @dentry: directory to unlink
618 * Returns 0 if current can write the containing directory
619 * and the directory, error code otherwise
621 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
623 struct smk_audit_info ad
;
626 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
627 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
630 * You need write access to the thing you're removing
632 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
635 * You also need write access to the containing directory
637 smk_ad_setfield_u_fs_path_dentry(&ad
, NULL
);
638 smk_ad_setfield_u_fs_inode(&ad
, dir
);
639 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
646 * smack_inode_rename - Smack check on rename
647 * @old_inode: the old directory
648 * @old_dentry: unused
649 * @new_inode: the new directory
650 * @new_dentry: unused
652 * Read and write access is required on both the old and
655 * Returns 0 if access is permitted, an error code otherwise
657 static int smack_inode_rename(struct inode
*old_inode
,
658 struct dentry
*old_dentry
,
659 struct inode
*new_inode
,
660 struct dentry
*new_dentry
)
664 struct smk_audit_info ad
;
666 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
667 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
669 isp
= smk_of_inode(old_dentry
->d_inode
);
670 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
672 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
673 isp
= smk_of_inode(new_dentry
->d_inode
);
674 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
675 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
681 * smack_inode_permission - Smack version of permission()
682 * @inode: the inode in question
683 * @mask: the access requested
685 * This is the important Smack hook.
687 * Returns 0 if access is permitted, -EACCES otherwise
689 static int smack_inode_permission(struct inode
*inode
, int mask
)
691 struct smk_audit_info ad
;
693 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
695 * No permission to check. Existence test. Yup, it's there.
699 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
700 smk_ad_setfield_u_fs_inode(&ad
, inode
);
701 return smk_curacc(smk_of_inode(inode
), mask
, &ad
);
705 * smack_inode_setattr - Smack check for setting attributes
706 * @dentry: the object
707 * @iattr: for the force flag
709 * Returns 0 if access is permitted, an error code otherwise
711 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
713 struct smk_audit_info ad
;
715 * Need to allow for clearing the setuid bit.
717 if (iattr
->ia_valid
& ATTR_FORCE
)
719 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
720 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
722 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
726 * smack_inode_getattr - Smack check for getting attributes
728 * @dentry: the object
730 * Returns 0 if access is permitted, an error code otherwise
732 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
734 struct smk_audit_info ad
;
736 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
737 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
738 smk_ad_setfield_u_fs_path_mnt(&ad
, mnt
);
739 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
743 * smack_inode_setxattr - Smack check for setting xattrs
744 * @dentry: the object
745 * @name: name of the attribute
750 * This protects the Smack attribute explicitly.
752 * Returns 0 if access is permitted, an error code otherwise
754 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
755 const void *value
, size_t size
, int flags
)
757 struct smk_audit_info ad
;
760 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
761 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
762 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
763 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
764 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
765 if (!capable(CAP_MAC_ADMIN
))
768 * check label validity here so import wont fail on
771 if (size
== 0 || size
>= SMK_LABELLEN
||
772 smk_import(value
, size
) == NULL
)
774 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
775 if (!capable(CAP_MAC_ADMIN
))
777 if (size
!= TRANS_TRUE_SIZE
||
778 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
781 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
783 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
784 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
787 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
793 * smack_inode_post_setxattr - Apply the Smack update approved above
795 * @name: attribute name
796 * @value: attribute value
797 * @size: attribute size
800 * Set the pointer in the inode blob to the entry found
801 * in the master label list.
803 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
804 const void *value
, size_t size
, int flags
)
807 struct inode_smack
*isp
= dentry
->d_inode
->i_security
;
809 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
810 nsp
= smk_import(value
, size
);
812 isp
->smk_inode
= nsp
;
814 isp
->smk_inode
= smack_known_invalid
.smk_known
;
815 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
816 nsp
= smk_import(value
, size
);
820 isp
->smk_task
= smack_known_invalid
.smk_known
;
821 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
822 nsp
= smk_import(value
, size
);
826 isp
->smk_mmap
= smack_known_invalid
.smk_known
;
827 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
828 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
834 * smack_inode_getxattr - Smack check on getxattr
835 * @dentry: the object
838 * Returns 0 if access is permitted, an error code otherwise
840 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
842 struct smk_audit_info ad
;
844 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
845 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
847 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
851 * smack_inode_removexattr - Smack check on removexattr
852 * @dentry: the object
853 * @name: name of the attribute
855 * Removing the Smack attribute requires CAP_MAC_ADMIN
857 * Returns 0 if access is permitted, an error code otherwise
859 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
861 struct inode_smack
*isp
;
862 struct smk_audit_info ad
;
865 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
866 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
867 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
868 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
869 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
870 strcmp(name
, XATTR_NAME_SMACKMMAP
)) {
871 if (!capable(CAP_MAC_ADMIN
))
874 rc
= cap_inode_removexattr(dentry
, name
);
876 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
877 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
879 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
882 isp
= dentry
->d_inode
->i_security
;
883 isp
->smk_task
= NULL
;
884 isp
->smk_mmap
= NULL
;
891 * smack_inode_getsecurity - get smack xattrs
893 * @name: attribute name
894 * @buffer: where to put the result
897 * Returns the size of the attribute or an error code
899 static int smack_inode_getsecurity(const struct inode
*inode
,
900 const char *name
, void **buffer
,
903 struct socket_smack
*ssp
;
905 struct super_block
*sbp
;
906 struct inode
*ip
= (struct inode
*)inode
;
911 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
912 isp
= smk_of_inode(inode
);
913 ilen
= strlen(isp
) + 1;
919 * The rest of the Smack xattrs are only on sockets.
922 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
926 if (sock
== NULL
|| sock
->sk
== NULL
)
929 ssp
= sock
->sk
->sk_security
;
931 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
933 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
938 ilen
= strlen(isp
) + 1;
949 * smack_inode_listsecurity - list the Smack attributes
951 * @buffer: where they go
952 * @buffer_size: size of buffer
954 * Returns 0 on success, -EINVAL otherwise
956 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
959 int len
= strlen(XATTR_NAME_SMACK
);
961 if (buffer
!= NULL
&& len
<= buffer_size
) {
962 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
969 * smack_inode_getsecid - Extract inode's security id
970 * @inode: inode to extract the info from
971 * @secid: where result will be saved
973 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
975 struct inode_smack
*isp
= inode
->i_security
;
977 *secid
= smack_to_secid(isp
->smk_inode
);
985 * smack_file_permission - Smack check on file operations
991 * Should access checks be done on each read or write?
992 * UNICOS and SELinux say yes.
993 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
995 * I'll say no for now. Smack does not do the frequent
996 * label changing that SELinux does.
998 static int smack_file_permission(struct file
*file
, int mask
)
1004 * smack_file_alloc_security - assign a file security blob
1007 * The security blob for a file is a pointer to the master
1008 * label list, so no allocation is done.
1012 static int smack_file_alloc_security(struct file
*file
)
1014 file
->f_security
= smk_of_current();
1019 * smack_file_free_security - clear a file security blob
1022 * The security blob for a file is a pointer to the master
1023 * label list, so no memory is freed.
1025 static void smack_file_free_security(struct file
*file
)
1027 file
->f_security
= NULL
;
1031 * smack_file_ioctl - Smack check on ioctls
1036 * Relies heavily on the correct use of the ioctl command conventions.
1038 * Returns 0 if allowed, error code otherwise
1040 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1044 struct smk_audit_info ad
;
1046 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
1047 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1049 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
1050 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1052 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
1053 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1059 * smack_file_lock - Smack check on file locking
1063 * Returns 0 if current has write access, error code otherwise
1065 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1067 struct smk_audit_info ad
;
1069 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
1070 smk_ad_setfield_u_fs_path_dentry(&ad
, file
->f_path
.dentry
);
1071 return smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1075 * smack_file_fcntl - Smack check on fcntl
1077 * @cmd: what action to check
1080 * Returns 0 if current has access, error code otherwise
1082 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1085 struct smk_audit_info ad
;
1088 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_FS
);
1089 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1098 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1106 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1109 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
, &ad
);
1116 * smk_mmap_list_check - the mmap check
1117 * @sub: subject label
1118 * @obj: object label
1119 * @access: access mode
1120 * @local: the task specific rule list
1122 * Returns 0 if acces is permitted, -EACCES otherwise
1124 static int smk_mmap_list_check(char *sub
, char *obj
, int access
,
1125 struct list_head
*local
)
1130 * If there is not a global rule that
1131 * allows access say no.
1133 may
= smk_access_entry(sub
, obj
, &smack_rule_list
);
1134 if (may
== -ENOENT
|| (may
& access
) != access
)
1137 * If there is a task local rule that
1138 * denies access say no.
1140 may
= smk_access_entry(sub
, obj
, local
);
1141 if (may
!= -ENOENT
&& (may
& access
) != access
)
1149 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1150 * if mapping anonymous memory.
1151 * @file contains the file structure for file to map (may be NULL).
1152 * @reqprot contains the protection requested by the application.
1153 * @prot contains the protection that will be applied by the kernel.
1154 * @flags contains the operational flags.
1155 * Return 0 if permission is granted.
1157 static int smack_file_mmap(struct file
*file
,
1158 unsigned long reqprot
, unsigned long prot
,
1159 unsigned long flags
, unsigned long addr
,
1160 unsigned long addr_only
)
1162 struct smack_rule
*srp
;
1163 struct task_smack
*tsp
;
1166 struct inode_smack
*isp
;
1170 /* do DAC check on address space usage */
1171 rc
= cap_file_mmap(file
, reqprot
, prot
, flags
, addr
, addr_only
);
1172 if (rc
|| addr_only
)
1175 if (file
== NULL
|| file
->f_dentry
== NULL
)
1178 dp
= file
->f_dentry
;
1180 if (dp
->d_inode
== NULL
)
1183 isp
= dp
->d_inode
->i_security
;
1184 if (isp
->smk_mmap
== NULL
)
1186 msmack
= isp
->smk_mmap
;
1188 tsp
= current_security();
1189 sp
= smk_of_current();
1194 * For each Smack rule associated with the subject
1195 * label verify that the SMACK64MMAP also has access
1196 * to that rule's object label.
1198 * Because neither of the labels comes
1199 * from the networking code it is sufficient
1200 * to compare pointers.
1202 list_for_each_entry_rcu(srp
, &smack_rule_list
, list
) {
1203 if (srp
->smk_subject
!= sp
)
1206 * Matching labels always allows access.
1208 if (msmack
== srp
->smk_object
)
1211 rc
= smk_mmap_list_check(msmack
, srp
->smk_object
,
1212 srp
->smk_access
, &tsp
->smk_rules
);
1223 * smack_file_set_fowner - set the file security blob value
1224 * @file: object in question
1227 * Further research may be required on this one.
1229 static int smack_file_set_fowner(struct file
*file
)
1231 file
->f_security
= smk_of_current();
1236 * smack_file_send_sigiotask - Smack on sigio
1237 * @tsk: The target task
1238 * @fown: the object the signal come from
1241 * Allow a privileged task to get signals even if it shouldn't
1243 * Returns 0 if a subject with the object's smack could
1244 * write to the task, an error code otherwise.
1246 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1247 struct fown_struct
*fown
, int signum
)
1251 char *tsp
= smk_of_task(tsk
->cred
->security
);
1252 struct smk_audit_info ad
;
1255 * struct fown_struct is never outside the context of a struct file
1257 file
= container_of(fown
, struct file
, f_owner
);
1259 /* we don't log here as rc can be overriden */
1260 rc
= smk_access(file
->f_security
, tsp
, MAY_WRITE
, NULL
);
1261 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1264 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1265 smk_ad_setfield_u_tsk(&ad
, tsk
);
1266 smack_log(file
->f_security
, tsp
, MAY_WRITE
, rc
, &ad
);
1271 * smack_file_receive - Smack file receive check
1274 * Returns 0 if current has access, error code otherwise
1276 static int smack_file_receive(struct file
*file
)
1279 struct smk_audit_info ad
;
1281 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1282 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1284 * This code relies on bitmasks.
1286 if (file
->f_mode
& FMODE_READ
)
1288 if (file
->f_mode
& FMODE_WRITE
)
1291 return smk_curacc(file
->f_security
, may
, &ad
);
1299 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1300 * @new: the new credentials
1301 * @gfp: the atomicity of any memory allocations
1303 * Prepare a blank set of credentials for modification. This must allocate all
1304 * the memory the LSM module might require such that cred_transfer() can
1305 * complete without error.
1307 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1309 struct task_smack
*tsp
;
1311 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1315 cred
->security
= tsp
;
1322 * smack_cred_free - "free" task-level security credentials
1323 * @cred: the credentials in question
1326 static void smack_cred_free(struct cred
*cred
)
1328 struct task_smack
*tsp
= cred
->security
;
1329 struct smack_rule
*rp
;
1330 struct list_head
*l
;
1331 struct list_head
*n
;
1335 cred
->security
= NULL
;
1337 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1338 rp
= list_entry(l
, struct smack_rule
, list
);
1339 list_del(&rp
->list
);
1346 * smack_cred_prepare - prepare new set of credentials for modification
1347 * @new: the new credentials
1348 * @old: the original credentials
1349 * @gfp: the atomicity of any memory allocations
1351 * Prepare a new set of credentials for modification.
1353 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1356 struct task_smack
*old_tsp
= old
->security
;
1357 struct task_smack
*new_tsp
;
1360 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1361 if (new_tsp
== NULL
)
1364 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1368 new->security
= new_tsp
;
1373 * smack_cred_transfer - Transfer the old credentials to the new credentials
1374 * @new: the new credentials
1375 * @old: the original credentials
1377 * Fill in a set of blank credentials from another set of credentials.
1379 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1381 struct task_smack
*old_tsp
= old
->security
;
1382 struct task_smack
*new_tsp
= new->security
;
1384 new_tsp
->smk_task
= old_tsp
->smk_task
;
1385 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1386 mutex_init(&new_tsp
->smk_rules_lock
);
1387 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1390 /* cbs copy rule list */
1394 * smack_kernel_act_as - Set the subjective context in a set of credentials
1395 * @new: points to the set of credentials to be modified.
1396 * @secid: specifies the security ID to be set
1398 * Set the security data for a kernel service.
1400 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1402 struct task_smack
*new_tsp
= new->security
;
1403 char *smack
= smack_from_secid(secid
);
1408 new_tsp
->smk_task
= smack
;
1413 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1414 * @new: points to the set of credentials to be modified
1415 * @inode: points to the inode to use as a reference
1417 * Set the file creation context in a set of credentials to the same
1418 * as the objective context of the specified inode
1420 static int smack_kernel_create_files_as(struct cred
*new,
1421 struct inode
*inode
)
1423 struct inode_smack
*isp
= inode
->i_security
;
1424 struct task_smack
*tsp
= new->security
;
1426 tsp
->smk_forked
= isp
->smk_inode
;
1427 tsp
->smk_task
= isp
->smk_inode
;
1432 * smk_curacc_on_task - helper to log task related access
1433 * @p: the task object
1434 * @access : the access requested
1436 * Return 0 if access is permitted
1438 static int smk_curacc_on_task(struct task_struct
*p
, int access
)
1440 struct smk_audit_info ad
;
1442 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1443 smk_ad_setfield_u_tsk(&ad
, p
);
1444 return smk_curacc(smk_of_task(task_security(p
)), access
, &ad
);
1448 * smack_task_setpgid - Smack check on setting pgid
1449 * @p: the task object
1452 * Return 0 if write access is permitted
1454 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1456 return smk_curacc_on_task(p
, MAY_WRITE
);
1460 * smack_task_getpgid - Smack access check for getpgid
1461 * @p: the object task
1463 * Returns 0 if current can read the object task, error code otherwise
1465 static int smack_task_getpgid(struct task_struct
*p
)
1467 return smk_curacc_on_task(p
, MAY_READ
);
1471 * smack_task_getsid - Smack access check for getsid
1472 * @p: the object task
1474 * Returns 0 if current can read the object task, error code otherwise
1476 static int smack_task_getsid(struct task_struct
*p
)
1478 return smk_curacc_on_task(p
, MAY_READ
);
1482 * smack_task_getsecid - get the secid of the task
1483 * @p: the object task
1484 * @secid: where to put the result
1486 * Sets the secid to contain a u32 version of the smack label.
1488 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1490 *secid
= smack_to_secid(smk_of_task(task_security(p
)));
1494 * smack_task_setnice - Smack check on setting nice
1495 * @p: the task object
1498 * Return 0 if write access is permitted
1500 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1504 rc
= cap_task_setnice(p
, nice
);
1506 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1511 * smack_task_setioprio - Smack check on setting ioprio
1512 * @p: the task object
1515 * Return 0 if write access is permitted
1517 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1521 rc
= cap_task_setioprio(p
, ioprio
);
1523 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1528 * smack_task_getioprio - Smack check on reading ioprio
1529 * @p: the task object
1531 * Return 0 if read access is permitted
1533 static int smack_task_getioprio(struct task_struct
*p
)
1535 return smk_curacc_on_task(p
, MAY_READ
);
1539 * smack_task_setscheduler - Smack check on setting scheduler
1540 * @p: the task object
1544 * Return 0 if read access is permitted
1546 static int smack_task_setscheduler(struct task_struct
*p
)
1550 rc
= cap_task_setscheduler(p
);
1552 rc
= smk_curacc_on_task(p
, MAY_WRITE
);
1557 * smack_task_getscheduler - Smack check on reading scheduler
1558 * @p: the task object
1560 * Return 0 if read access is permitted
1562 static int smack_task_getscheduler(struct task_struct
*p
)
1564 return smk_curacc_on_task(p
, MAY_READ
);
1568 * smack_task_movememory - Smack check on moving memory
1569 * @p: the task object
1571 * Return 0 if write access is permitted
1573 static int smack_task_movememory(struct task_struct
*p
)
1575 return smk_curacc_on_task(p
, MAY_WRITE
);
1579 * smack_task_kill - Smack check on signal delivery
1580 * @p: the task object
1583 * @secid: identifies the smack to use in lieu of current's
1585 * Return 0 if write access is permitted
1587 * The secid behavior is an artifact of an SELinux hack
1588 * in the USB code. Someday it may go away.
1590 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1593 struct smk_audit_info ad
;
1595 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1596 smk_ad_setfield_u_tsk(&ad
, p
);
1598 * Sending a signal requires that the sender
1599 * can write the receiver.
1602 return smk_curacc(smk_of_task(task_security(p
)), MAY_WRITE
,
1605 * If the secid isn't 0 we're dealing with some USB IO
1606 * specific behavior. This is not clean. For one thing
1607 * we can't take privilege into account.
1609 return smk_access(smack_from_secid(secid
),
1610 smk_of_task(task_security(p
)), MAY_WRITE
, &ad
);
1614 * smack_task_wait - Smack access check for waiting
1615 * @p: task to wait for
1617 * Returns 0 if current can wait for p, error code otherwise
1619 static int smack_task_wait(struct task_struct
*p
)
1621 struct smk_audit_info ad
;
1622 char *sp
= smk_of_current();
1623 char *tsp
= smk_of_forked(task_security(p
));
1626 /* we don't log here, we can be overriden */
1627 rc
= smk_access(tsp
, sp
, MAY_WRITE
, NULL
);
1632 * Allow the operation to succeed if either task
1633 * has privilege to perform operations that might
1634 * account for the smack labels having gotten to
1635 * be different in the first place.
1637 * This breaks the strict subject/object access
1638 * control ideal, taking the object's privilege
1639 * state into account in the decision as well as
1642 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1644 /* we log only if we didn't get overriden */
1646 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1647 smk_ad_setfield_u_tsk(&ad
, p
);
1648 smack_log(tsp
, sp
, MAY_WRITE
, rc
, &ad
);
1653 * smack_task_to_inode - copy task smack into the inode blob
1654 * @p: task to copy from
1655 * @inode: inode to copy to
1657 * Sets the smack pointer in the inode security blob
1659 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1661 struct inode_smack
*isp
= inode
->i_security
;
1662 isp
->smk_inode
= smk_of_task(task_security(p
));
1670 * smack_sk_alloc_security - Allocate a socket blob
1673 * @gfp_flags: memory allocation flags
1675 * Assign Smack pointers to current
1677 * Returns 0 on success, -ENOMEM is there's no memory
1679 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1681 char *csp
= smk_of_current();
1682 struct socket_smack
*ssp
;
1684 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1690 ssp
->smk_packet
[0] = '\0';
1692 sk
->sk_security
= ssp
;
1698 * smack_sk_free_security - Free a socket blob
1701 * Clears the blob pointer
1703 static void smack_sk_free_security(struct sock
*sk
)
1705 kfree(sk
->sk_security
);
1709 * smack_host_label - check host based restrictions
1710 * @sip: the object end
1712 * looks for host based access restrictions
1714 * This version will only be appropriate for really small sets of single label
1715 * hosts. The caller is responsible for ensuring that the RCU read lock is
1716 * taken before calling this function.
1718 * Returns the label of the far end or NULL if it's not special.
1720 static char *smack_host_label(struct sockaddr_in
*sip
)
1722 struct smk_netlbladdr
*snp
;
1723 struct in_addr
*siap
= &sip
->sin_addr
;
1725 if (siap
->s_addr
== 0)
1728 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
1730 * we break after finding the first match because
1731 * the list is sorted from longest to shortest mask
1732 * so we have found the most specific match
1734 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1735 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1736 /* we have found the special CIPSO option */
1737 if (snp
->smk_label
== smack_cipso_option
)
1739 return snp
->smk_label
;
1746 * smack_set_catset - convert a capset to netlabel mls categories
1747 * @catset: the Smack categories
1748 * @sap: where to put the netlabel categories
1750 * Allocates and fills attr.mls.cat
1752 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1763 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1764 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1765 sap
->attr
.mls
.cat
->startbit
= 0;
1767 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1768 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1771 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1777 * smack_to_secattr - fill a secattr from a smack value
1778 * @smack: the smack value
1779 * @nlsp: where the result goes
1781 * Casey says that CIPSO is good enough for now.
1782 * It can be used to effect.
1783 * It can also be abused to effect when necessary.
1784 * Appologies to the TSIG group in general and GW in particular.
1786 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1788 struct smack_cipso cipso
;
1791 nlsp
->domain
= smack
;
1792 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1794 rc
= smack_to_cipso(smack
, &cipso
);
1796 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1797 smack_set_catset(cipso
.smk_catset
, nlsp
);
1799 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1800 smack_set_catset(smack
, nlsp
);
1805 * smack_netlabel - Set the secattr on a socket
1807 * @labeled: socket label scheme
1809 * Convert the outbound smack value (smk_out) to a
1810 * secattr and attach it to the socket.
1812 * Returns 0 on success or an error code
1814 static int smack_netlabel(struct sock
*sk
, int labeled
)
1816 struct socket_smack
*ssp
= sk
->sk_security
;
1817 struct netlbl_lsm_secattr secattr
;
1821 * Usually the netlabel code will handle changing the
1822 * packet labeling based on the label.
1823 * The case of a single label host is different, because
1824 * a single label host should never get a labeled packet
1825 * even though the label is usually associated with a packet
1829 bh_lock_sock_nested(sk
);
1831 if (ssp
->smk_out
== smack_net_ambient
||
1832 labeled
== SMACK_UNLABELED_SOCKET
)
1833 netlbl_sock_delattr(sk
);
1835 netlbl_secattr_init(&secattr
);
1836 smack_to_secattr(ssp
->smk_out
, &secattr
);
1837 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &secattr
);
1838 netlbl_secattr_destroy(&secattr
);
1848 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1850 * @sap: the destination address
1852 * Set the correct secattr for the given socket based on the destination
1853 * address and perform any outbound access checks needed.
1855 * Returns 0 on success or an error code.
1858 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
1863 struct socket_smack
*ssp
= sk
->sk_security
;
1864 struct smk_audit_info ad
;
1867 hostsp
= smack_host_label(sap
);
1868 if (hostsp
!= NULL
) {
1869 sk_lbl
= SMACK_UNLABELED_SOCKET
;
1871 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
1872 ad
.a
.u
.net
.family
= sap
->sin_family
;
1873 ad
.a
.u
.net
.dport
= sap
->sin_port
;
1874 ad
.a
.u
.net
.v4info
.daddr
= sap
->sin_addr
.s_addr
;
1876 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
, &ad
);
1878 sk_lbl
= SMACK_CIPSO_SOCKET
;
1885 return smack_netlabel(sk
, sk_lbl
);
1889 * smack_inode_setsecurity - set smack xattrs
1890 * @inode: the object
1891 * @name: attribute name
1892 * @value: attribute value
1893 * @size: size of the attribute
1896 * Sets the named attribute in the appropriate blob
1898 * Returns 0 on success, or an error code
1900 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1901 const void *value
, size_t size
, int flags
)
1904 struct inode_smack
*nsp
= inode
->i_security
;
1905 struct socket_smack
*ssp
;
1906 struct socket
*sock
;
1909 if (value
== NULL
|| size
> SMK_LABELLEN
|| size
== 0)
1912 sp
= smk_import(value
, size
);
1916 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1917 nsp
->smk_inode
= sp
;
1918 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
1922 * The rest of the Smack xattrs are only on sockets.
1924 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1927 sock
= SOCKET_I(inode
);
1928 if (sock
== NULL
|| sock
->sk
== NULL
)
1931 ssp
= sock
->sk
->sk_security
;
1933 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1935 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1937 if (sock
->sk
->sk_family
!= PF_UNIX
) {
1938 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1941 "Smack: \"%s\" netlbl error %d.\n",
1951 * smack_socket_post_create - finish socket setup
1953 * @family: protocol family
1958 * Sets the netlabel information on the socket
1960 * Returns 0 on success, and error code otherwise
1962 static int smack_socket_post_create(struct socket
*sock
, int family
,
1963 int type
, int protocol
, int kern
)
1965 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1968 * Set the outbound netlbl.
1970 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1974 * smack_socket_connect - connect access check
1976 * @sap: the other end
1977 * @addrlen: size of sap
1979 * Verifies that a connection may be possible
1981 * Returns 0 on success, and error code otherwise
1983 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
1986 if (sock
->sk
== NULL
|| sock
->sk
->sk_family
!= PF_INET
)
1988 if (addrlen
< sizeof(struct sockaddr_in
))
1991 return smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
1995 * smack_flags_to_may - convert S_ to MAY_ values
1996 * @flags: the S_ value
1998 * Returns the equivalent MAY_ value
2000 static int smack_flags_to_may(int flags
)
2004 if (flags
& S_IRUGO
)
2006 if (flags
& S_IWUGO
)
2008 if (flags
& S_IXUGO
)
2015 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2020 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2022 msg
->security
= smk_of_current();
2027 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2030 * Clears the blob pointer
2032 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2034 msg
->security
= NULL
;
2038 * smack_of_shm - the smack pointer for the shm
2041 * Returns a pointer to the smack value
2043 static char *smack_of_shm(struct shmid_kernel
*shp
)
2045 return (char *)shp
->shm_perm
.security
;
2049 * smack_shm_alloc_security - Set the security blob for shm
2054 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2056 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2058 isp
->security
= smk_of_current();
2063 * smack_shm_free_security - Clear the security blob for shm
2066 * Clears the blob pointer
2068 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2070 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2072 isp
->security
= NULL
;
2076 * smk_curacc_shm : check if current has access on shm
2078 * @access : access requested
2080 * Returns 0 if current has the requested access, error code otherwise
2082 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2084 char *ssp
= smack_of_shm(shp
);
2085 struct smk_audit_info ad
;
2088 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2089 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2091 return smk_curacc(ssp
, access
, &ad
);
2095 * smack_shm_associate - Smack access check for shm
2097 * @shmflg: access requested
2099 * Returns 0 if current has the requested access, error code otherwise
2101 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2105 may
= smack_flags_to_may(shmflg
);
2106 return smk_curacc_shm(shp
, may
);
2110 * smack_shm_shmctl - Smack access check for shm
2112 * @cmd: what it wants to do
2114 * Returns 0 if current has the requested access, error code otherwise
2116 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2129 may
= MAY_READWRITE
;
2134 * System level information.
2140 return smk_curacc_shm(shp
, may
);
2144 * smack_shm_shmat - Smack access for shmat
2147 * @shmflg: access requested
2149 * Returns 0 if current has the requested access, error code otherwise
2151 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2156 may
= smack_flags_to_may(shmflg
);
2157 return smk_curacc_shm(shp
, may
);
2161 * smack_of_sem - the smack pointer for the sem
2164 * Returns a pointer to the smack value
2166 static char *smack_of_sem(struct sem_array
*sma
)
2168 return (char *)sma
->sem_perm
.security
;
2172 * smack_sem_alloc_security - Set the security blob for sem
2177 static int smack_sem_alloc_security(struct sem_array
*sma
)
2179 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2181 isp
->security
= smk_of_current();
2186 * smack_sem_free_security - Clear the security blob for sem
2189 * Clears the blob pointer
2191 static void smack_sem_free_security(struct sem_array
*sma
)
2193 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2195 isp
->security
= NULL
;
2199 * smk_curacc_sem : check if current has access on sem
2201 * @access : access requested
2203 * Returns 0 if current has the requested access, error code otherwise
2205 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2207 char *ssp
= smack_of_sem(sma
);
2208 struct smk_audit_info ad
;
2211 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2212 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2214 return smk_curacc(ssp
, access
, &ad
);
2218 * smack_sem_associate - Smack access check for sem
2220 * @semflg: access requested
2222 * Returns 0 if current has the requested access, error code otherwise
2224 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2228 may
= smack_flags_to_may(semflg
);
2229 return smk_curacc_sem(sma
, may
);
2233 * smack_sem_shmctl - Smack access check for sem
2235 * @cmd: what it wants to do
2237 * Returns 0 if current has the requested access, error code otherwise
2239 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2257 may
= MAY_READWRITE
;
2262 * System level information
2269 return smk_curacc_sem(sma
, may
);
2273 * smack_sem_semop - Smack checks of semaphore operations
2279 * Treated as read and write in all cases.
2281 * Returns 0 if access is allowed, error code otherwise
2283 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2284 unsigned nsops
, int alter
)
2286 return smk_curacc_sem(sma
, MAY_READWRITE
);
2290 * smack_msg_alloc_security - Set the security blob for msg
2295 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2297 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2299 kisp
->security
= smk_of_current();
2304 * smack_msg_free_security - Clear the security blob for msg
2307 * Clears the blob pointer
2309 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2311 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2313 kisp
->security
= NULL
;
2317 * smack_of_msq - the smack pointer for the msq
2320 * Returns a pointer to the smack value
2322 static char *smack_of_msq(struct msg_queue
*msq
)
2324 return (char *)msq
->q_perm
.security
;
2328 * smk_curacc_msq : helper to check if current has access on msq
2330 * @access : access requested
2332 * return 0 if current has access, error otherwise
2334 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2336 char *msp
= smack_of_msq(msq
);
2337 struct smk_audit_info ad
;
2340 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2341 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2343 return smk_curacc(msp
, access
, &ad
);
2347 * smack_msg_queue_associate - Smack access check for msg_queue
2349 * @msqflg: access requested
2351 * Returns 0 if current has the requested access, error code otherwise
2353 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2357 may
= smack_flags_to_may(msqflg
);
2358 return smk_curacc_msq(msq
, may
);
2362 * smack_msg_queue_msgctl - Smack access check for msg_queue
2364 * @cmd: what it wants to do
2366 * Returns 0 if current has the requested access, error code otherwise
2368 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2379 may
= MAY_READWRITE
;
2384 * System level information
2391 return smk_curacc_msq(msq
, may
);
2395 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2398 * @msqflg: access requested
2400 * Returns 0 if current has the requested access, error code otherwise
2402 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2407 may
= smack_flags_to_may(msqflg
);
2408 return smk_curacc_msq(msq
, may
);
2412 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2419 * Returns 0 if current has read and write access, error code otherwise
2421 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2422 struct task_struct
*target
, long type
, int mode
)
2424 return smk_curacc_msq(msq
, MAY_READWRITE
);
2428 * smack_ipc_permission - Smack access for ipc_permission()
2429 * @ipp: the object permissions
2430 * @flag: access requested
2432 * Returns 0 if current has read and write access, error code otherwise
2434 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2436 char *isp
= ipp
->security
;
2437 int may
= smack_flags_to_may(flag
);
2438 struct smk_audit_info ad
;
2441 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2442 ad
.a
.u
.ipc_id
= ipp
->id
;
2444 return smk_curacc(isp
, may
, &ad
);
2448 * smack_ipc_getsecid - Extract smack security id
2449 * @ipp: the object permissions
2450 * @secid: where result will be saved
2452 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2454 char *smack
= ipp
->security
;
2456 *secid
= smack_to_secid(smack
);
2460 * smack_d_instantiate - Make sure the blob is correct on an inode
2461 * @opt_dentry: dentry where inode will be attached
2462 * @inode: the object
2464 * Set the inode's security blob if it hasn't been done already.
2466 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2468 struct super_block
*sbp
;
2469 struct superblock_smack
*sbsp
;
2470 struct inode_smack
*isp
;
2471 char *csp
= smk_of_current();
2474 char trattr
[TRANS_TRUE_SIZE
];
2481 isp
= inode
->i_security
;
2483 mutex_lock(&isp
->smk_lock
);
2485 * If the inode is already instantiated
2486 * take the quick way out
2488 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2492 sbsp
= sbp
->s_security
;
2494 * We're going to use the superblock default label
2495 * if there's no label on the file.
2497 final
= sbsp
->smk_default
;
2500 * If this is the root inode the superblock
2501 * may be in the process of initialization.
2502 * If that is the case use the root value out
2503 * of the superblock.
2505 if (opt_dentry
->d_parent
== opt_dentry
) {
2506 isp
->smk_inode
= sbsp
->smk_root
;
2507 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2512 * This is pretty hackish.
2513 * Casey says that we shouldn't have to do
2514 * file system specific code, but it does help
2515 * with keeping it simple.
2517 switch (sbp
->s_magic
) {
2520 * Casey says that it's a little embarassing
2521 * that the smack file system doesn't do
2522 * extended attributes.
2524 final
= smack_known_star
.smk_known
;
2528 * Casey says pipes are easy (?)
2530 final
= smack_known_star
.smk_known
;
2532 case DEVPTS_SUPER_MAGIC
:
2534 * devpts seems content with the label of the task.
2535 * Programs that change smack have to treat the
2542 * Socket access is controlled by the socket
2543 * structures associated with the task involved.
2545 final
= smack_known_star
.smk_known
;
2547 case PROC_SUPER_MAGIC
:
2549 * Casey says procfs appears not to care.
2550 * The superblock default suffices.
2555 * Device labels should come from the filesystem,
2556 * but watch out, because they're volitile,
2557 * getting recreated on every reboot.
2559 final
= smack_known_star
.smk_known
;
2563 * If a smack value has been set we want to use it,
2564 * but since tmpfs isn't giving us the opportunity
2565 * to set mount options simulate setting the
2566 * superblock default.
2570 * This isn't an understood special case.
2571 * Get the value from the xattr.
2575 * UNIX domain sockets use lower level socket data.
2577 if (S_ISSOCK(inode
->i_mode
)) {
2578 final
= smack_known_star
.smk_known
;
2582 * No xattr support means, alas, no SMACK label.
2583 * Use the aforeapplied default.
2584 * It would be curious if the label of the task
2585 * does not match that assigned.
2587 if (inode
->i_op
->getxattr
== NULL
)
2590 * Get the dentry for xattr.
2592 dp
= dget(opt_dentry
);
2593 fetched
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
2594 if (fetched
!= NULL
) {
2596 if (S_ISDIR(inode
->i_mode
)) {
2598 inode
->i_op
->getxattr(dp
,
2599 XATTR_NAME_SMACKTRANSMUTE
,
2600 trattr
, TRANS_TRUE_SIZE
);
2601 if (strncmp(trattr
, TRANS_TRUE
,
2602 TRANS_TRUE_SIZE
) == 0)
2603 transflag
= SMK_INODE_TRANSMUTE
;
2606 isp
->smk_task
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
2607 isp
->smk_mmap
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
2614 isp
->smk_inode
= csp
;
2616 isp
->smk_inode
= final
;
2618 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
2621 mutex_unlock(&isp
->smk_lock
);
2626 * smack_getprocattr - Smack process attribute access
2627 * @p: the object task
2628 * @name: the name of the attribute in /proc/.../attr
2629 * @value: where to put the result
2631 * Places a copy of the task Smack into value
2633 * Returns the length of the smack label or an error code
2635 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2640 if (strcmp(name
, "current") != 0)
2643 cp
= kstrdup(smk_of_task(task_security(p
)), GFP_KERNEL
);
2653 * smack_setprocattr - Smack process attribute setting
2654 * @p: the object task
2655 * @name: the name of the attribute in /proc/.../attr
2656 * @value: the value to set
2657 * @size: the size of the value
2659 * Sets the Smack value of the task. Only setting self
2660 * is permitted and only with privilege
2662 * Returns the length of the smack label or an error code
2664 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2665 void *value
, size_t size
)
2668 struct task_smack
*tsp
;
2669 struct task_smack
*oldtsp
;
2674 * Changing another process' Smack value is too dangerous
2675 * and supports no sane use case.
2680 if (!capable(CAP_MAC_ADMIN
))
2683 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2686 if (strcmp(name
, "current") != 0)
2689 newsmack
= smk_import(value
, size
);
2690 if (newsmack
== NULL
)
2694 * No process is ever allowed the web ("@") label.
2696 if (newsmack
== smack_known_web
.smk_known
)
2699 oldtsp
= p
->cred
->security
;
2700 new = prepare_creds();
2704 tsp
= new_task_smack(newsmack
, oldtsp
->smk_forked
, GFP_KERNEL
);
2709 rc
= smk_copy_rules(&tsp
->smk_rules
, &oldtsp
->smk_rules
, GFP_KERNEL
);
2713 new->security
= tsp
;
2719 * smack_unix_stream_connect - Smack access on UDS
2721 * @other: the other sock
2724 * Return 0 if a subject with the smack of sock could access
2725 * an object with the smack of other, otherwise an error code
2727 static int smack_unix_stream_connect(struct sock
*sock
,
2728 struct sock
*other
, struct sock
*newsk
)
2730 struct socket_smack
*ssp
= sock
->sk_security
;
2731 struct socket_smack
*osp
= other
->sk_security
;
2732 struct smk_audit_info ad
;
2735 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2736 smk_ad_setfield_u_net_sk(&ad
, other
);
2738 if (!capable(CAP_MAC_OVERRIDE
))
2739 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
2745 * smack_unix_may_send - Smack access on UDS
2747 * @other: the other socket
2749 * Return 0 if a subject with the smack of sock could access
2750 * an object with the smack of other, otherwise an error code
2752 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2754 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2755 struct socket_smack
*osp
= other
->sk
->sk_security
;
2756 struct smk_audit_info ad
;
2759 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2760 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
2762 if (!capable(CAP_MAC_OVERRIDE
))
2763 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
2769 * smack_socket_sendmsg - Smack check based on destination host
2772 * @size: the size of the message
2774 * Return 0 if the current subject can write to the destination
2775 * host. This is only a question if the destination is a single
2778 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
2781 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
2784 * Perfectly reasonable for this to be NULL
2786 if (sip
== NULL
|| sip
->sin_family
!= AF_INET
)
2789 return smack_netlabel_send(sock
->sk
, sip
);
2794 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2795 * @sap: netlabel secattr
2796 * @sip: where to put the result
2798 * Copies a smack label into sip
2800 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2802 char smack
[SMK_LABELLEN
];
2806 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
2808 * Looks like a CIPSO packet.
2809 * If there are flags but no level netlabel isn't
2810 * behaving the way we expect it to.
2812 * Get the categories, if any
2813 * Without guidance regarding the smack value
2814 * for the packet fall back on the network
2817 memset(smack
, '\0', SMK_LABELLEN
);
2818 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2820 pcat
= netlbl_secattr_catmap_walk(
2821 sap
->attr
.mls
.cat
, pcat
+ 1);
2824 smack_catset_bit(pcat
, smack
);
2827 * If it is CIPSO using smack direct mapping
2828 * we are already done. WeeHee.
2830 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2831 memcpy(sip
, smack
, SMK_MAXLEN
);
2835 * Look it up in the supplied table if it is not
2838 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2841 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
2843 * Looks like a fallback, which gives us a secid.
2845 sp
= smack_from_secid(sap
->attr
.secid
);
2847 * This has got to be a bug because it is
2848 * impossible to specify a fallback without
2849 * specifying the label, which will ensure
2850 * it has a secid, and the only way to get a
2851 * secid is from a fallback.
2854 strncpy(sip
, sp
, SMK_MAXLEN
);
2858 * Without guidance regarding the smack value
2859 * for the packet fall back on the network
2862 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2867 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2871 * Returns 0 if the packet should be delivered, an error code otherwise
2873 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2875 struct netlbl_lsm_secattr secattr
;
2876 struct socket_smack
*ssp
= sk
->sk_security
;
2877 char smack
[SMK_LABELLEN
];
2880 struct smk_audit_info ad
;
2881 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2885 * Translate what netlabel gave us.
2887 netlbl_secattr_init(&secattr
);
2889 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2891 smack_from_secattr(&secattr
, smack
);
2894 csp
= smack_net_ambient
;
2896 netlbl_secattr_destroy(&secattr
);
2899 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
2900 ad
.a
.u
.net
.family
= sk
->sk_family
;
2901 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
2902 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
2905 * Receiving a packet requires that the other end
2906 * be able to write here. Read access is not required.
2907 * This is the simplist possible security model
2910 rc
= smk_access(csp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
2912 netlbl_skbuff_err(skb
, rc
, 0);
2917 * smack_socket_getpeersec_stream - pull in packet label
2919 * @optval: user's destination
2920 * @optlen: size thereof
2923 * returns zero on success, an error code otherwise
2925 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2926 char __user
*optval
,
2927 int __user
*optlen
, unsigned len
)
2929 struct socket_smack
*ssp
;
2933 ssp
= sock
->sk
->sk_security
;
2934 slen
= strlen(ssp
->smk_packet
) + 1;
2938 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2941 if (put_user(slen
, optlen
) != 0)
2949 * smack_socket_getpeersec_dgram - pull in packet label
2950 * @sock: the peer socket
2952 * @secid: pointer to where to put the secid of the packet
2954 * Sets the netlabel socket state on sk from parent
2956 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2957 struct sk_buff
*skb
, u32
*secid
)
2960 struct netlbl_lsm_secattr secattr
;
2961 struct socket_smack
*sp
;
2962 char smack
[SMK_LABELLEN
];
2963 int family
= PF_UNSPEC
;
2964 u32 s
= 0; /* 0 is the invalid secid */
2968 if (skb
->protocol
== htons(ETH_P_IP
))
2970 else if (skb
->protocol
== htons(ETH_P_IPV6
))
2973 if (family
== PF_UNSPEC
&& sock
!= NULL
)
2974 family
= sock
->sk
->sk_family
;
2976 if (family
== PF_UNIX
) {
2977 sp
= sock
->sk
->sk_security
;
2978 s
= smack_to_secid(sp
->smk_out
);
2979 } else if (family
== PF_INET
|| family
== PF_INET6
) {
2981 * Translate what netlabel gave us.
2983 netlbl_secattr_init(&secattr
);
2984 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2986 smack_from_secattr(&secattr
, smack
);
2987 s
= smack_to_secid(smack
);
2989 netlbl_secattr_destroy(&secattr
);
2998 * smack_sock_graft - Initialize a newly created socket with an existing sock
3000 * @parent: parent socket
3002 * Set the smk_{in,out} state of an existing sock based on the process that
3003 * is creating the new socket.
3005 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3007 struct socket_smack
*ssp
;
3010 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3013 ssp
= sk
->sk_security
;
3014 ssp
->smk_in
= ssp
->smk_out
= smk_of_current();
3015 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3019 * smack_inet_conn_request - Smack access check on connect
3020 * @sk: socket involved
3024 * Returns 0 if a task with the packet label could write to
3025 * the socket, otherwise an error code
3027 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3028 struct request_sock
*req
)
3030 u16 family
= sk
->sk_family
;
3031 struct socket_smack
*ssp
= sk
->sk_security
;
3032 struct netlbl_lsm_secattr secattr
;
3033 struct sockaddr_in addr
;
3035 char smack
[SMK_LABELLEN
];
3037 struct smk_audit_info ad
;
3039 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3040 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
3043 netlbl_secattr_init(&secattr
);
3044 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3046 smack_from_secattr(&secattr
, smack
);
3048 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
3049 netlbl_secattr_destroy(&secattr
);
3052 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NET
);
3053 ad
.a
.u
.net
.family
= family
;
3054 ad
.a
.u
.net
.netif
= skb
->skb_iif
;
3055 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3058 * Receiving a packet requires that the other end be able to write
3059 * here. Read access is not required.
3061 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3066 * Save the peer's label in the request_sock so we can later setup
3067 * smk_packet in the child socket so that SO_PEERCRED can report it.
3069 req
->peer_secid
= smack_to_secid(smack
);
3072 * We need to decide if we want to label the incoming connection here
3073 * if we do we only need to label the request_sock and the stack will
3074 * propogate the wire-label to the sock when it is created.
3077 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3079 if (smack_host_label(&addr
) == NULL
) {
3081 netlbl_secattr_init(&secattr
);
3082 smack_to_secattr(smack
, &secattr
);
3083 rc
= netlbl_req_setattr(req
, &secattr
);
3084 netlbl_secattr_destroy(&secattr
);
3087 netlbl_req_delattr(req
);
3094 * smack_inet_csk_clone - Copy the connection information to the new socket
3095 * @sk: the new socket
3096 * @req: the connection's request_sock
3098 * Transfer the connection's peer label to the newly created socket.
3100 static void smack_inet_csk_clone(struct sock
*sk
,
3101 const struct request_sock
*req
)
3103 struct socket_smack
*ssp
= sk
->sk_security
;
3106 if (req
->peer_secid
!= 0) {
3107 smack
= smack_from_secid(req
->peer_secid
);
3108 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
3110 ssp
->smk_packet
[0] = '\0';
3114 * Key management security hooks
3116 * Casey has not tested key support very heavily.
3117 * The permission check is most likely too restrictive.
3118 * If you care about keys please have a look.
3123 * smack_key_alloc - Set the key security blob
3125 * @cred: the credentials to use
3128 * No allocation required
3132 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3133 unsigned long flags
)
3135 key
->security
= smk_of_task(cred
->security
);
3140 * smack_key_free - Clear the key security blob
3143 * Clear the blob pointer
3145 static void smack_key_free(struct key
*key
)
3147 key
->security
= NULL
;
3151 * smack_key_permission - Smack access on a key
3152 * @key_ref: gets to the object
3153 * @cred: the credentials to use
3156 * Return 0 if the task has read and write to the object,
3157 * an error code otherwise
3159 static int smack_key_permission(key_ref_t key_ref
,
3160 const struct cred
*cred
, key_perm_t perm
)
3163 struct smk_audit_info ad
;
3164 char *tsp
= smk_of_task(cred
->security
);
3166 keyp
= key_ref_to_ptr(key_ref
);
3170 * If the key hasn't been initialized give it access so that
3173 if (keyp
->security
== NULL
)
3176 * This should not occur
3181 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3182 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3183 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
3185 return smk_access(tsp
, keyp
->security
,
3186 MAY_READWRITE
, &ad
);
3188 #endif /* CONFIG_KEYS */
3193 * Audit requires a unique representation of each Smack specific
3194 * rule. This unique representation is used to distinguish the
3195 * object to be audited from remaining kernel objects and also
3196 * works as a glue between the audit hooks.
3198 * Since repository entries are added but never deleted, we'll use
3199 * the smack_known label address related to the given audit rule as
3200 * the needed unique representation. This also better fits the smack
3201 * model where nearly everything is a label.
3206 * smack_audit_rule_init - Initialize a smack audit rule
3207 * @field: audit rule fields given from user-space (audit.h)
3208 * @op: required testing operator (=, !=, >, <, ...)
3209 * @rulestr: smack label to be audited
3210 * @vrule: pointer to save our own audit rule representation
3212 * Prepare to audit cases where (@field @op @rulestr) is true.
3213 * The label to be audited is created if necessay.
3215 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
3217 char **rule
= (char **)vrule
;
3220 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3223 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
3226 *rule
= smk_import(rulestr
, 0);
3232 * smack_audit_rule_known - Distinguish Smack audit rules
3233 * @krule: rule of interest, in Audit kernel representation format
3235 * This is used to filter Smack rules from remaining Audit ones.
3236 * If it's proved that this rule belongs to us, the
3237 * audit_rule_match hook will be called to do the final judgement.
3239 static int smack_audit_rule_known(struct audit_krule
*krule
)
3241 struct audit_field
*f
;
3244 for (i
= 0; i
< krule
->field_count
; i
++) {
3245 f
= &krule
->fields
[i
];
3247 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
3255 * smack_audit_rule_match - Audit given object ?
3256 * @secid: security id for identifying the object to test
3257 * @field: audit rule flags given from user-space
3258 * @op: required testing operator
3259 * @vrule: smack internal rule presentation
3260 * @actx: audit context associated with the check
3262 * The core Audit hook. It's used to take the decision of
3263 * whether to audit or not to audit a given object.
3265 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
3266 struct audit_context
*actx
)
3272 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
3273 "Smack: missing rule\n");
3277 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3280 smack
= smack_from_secid(secid
);
3283 * No need to do string comparisons. If a match occurs,
3284 * both pointers will point to the same smack_known
3287 if (op
== Audit_equal
)
3288 return (rule
== smack
);
3289 if (op
== Audit_not_equal
)
3290 return (rule
!= smack
);
3296 * smack_audit_rule_free - free smack rule representation
3297 * @vrule: rule to be freed.
3299 * No memory was allocated.
3301 static void smack_audit_rule_free(void *vrule
)
3306 #endif /* CONFIG_AUDIT */
3309 * smack_secid_to_secctx - return the smack label for a secid
3310 * @secid: incoming integer
3311 * @secdata: destination
3312 * @seclen: how long it is
3314 * Exists for networking code.
3316 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
3318 char *sp
= smack_from_secid(secid
);
3322 *seclen
= strlen(sp
);
3327 * smack_secctx_to_secid - return the secid for a smack label
3328 * @secdata: smack label
3329 * @seclen: how long result is
3330 * @secid: outgoing integer
3332 * Exists for audit and networking code.
3334 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
3336 *secid
= smack_to_secid(secdata
);
3341 * smack_release_secctx - don't do anything.
3345 * Exists to make sure nothing gets done, and properly
3347 static void smack_release_secctx(char *secdata
, u32 seclen
)
3351 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
3353 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
3356 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
3358 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
3361 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
3364 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
3372 struct security_operations smack_ops
= {
3375 .ptrace_access_check
= smack_ptrace_access_check
,
3376 .ptrace_traceme
= smack_ptrace_traceme
,
3377 .syslog
= smack_syslog
,
3379 .sb_alloc_security
= smack_sb_alloc_security
,
3380 .sb_free_security
= smack_sb_free_security
,
3381 .sb_copy_data
= smack_sb_copy_data
,
3382 .sb_kern_mount
= smack_sb_kern_mount
,
3383 .sb_statfs
= smack_sb_statfs
,
3384 .sb_mount
= smack_sb_mount
,
3385 .sb_umount
= smack_sb_umount
,
3387 .bprm_set_creds
= smack_bprm_set_creds
,
3389 .inode_alloc_security
= smack_inode_alloc_security
,
3390 .inode_free_security
= smack_inode_free_security
,
3391 .inode_init_security
= smack_inode_init_security
,
3392 .inode_link
= smack_inode_link
,
3393 .inode_unlink
= smack_inode_unlink
,
3394 .inode_rmdir
= smack_inode_rmdir
,
3395 .inode_rename
= smack_inode_rename
,
3396 .inode_permission
= smack_inode_permission
,
3397 .inode_setattr
= smack_inode_setattr
,
3398 .inode_getattr
= smack_inode_getattr
,
3399 .inode_setxattr
= smack_inode_setxattr
,
3400 .inode_post_setxattr
= smack_inode_post_setxattr
,
3401 .inode_getxattr
= smack_inode_getxattr
,
3402 .inode_removexattr
= smack_inode_removexattr
,
3403 .inode_getsecurity
= smack_inode_getsecurity
,
3404 .inode_setsecurity
= smack_inode_setsecurity
,
3405 .inode_listsecurity
= smack_inode_listsecurity
,
3406 .inode_getsecid
= smack_inode_getsecid
,
3408 .file_permission
= smack_file_permission
,
3409 .file_alloc_security
= smack_file_alloc_security
,
3410 .file_free_security
= smack_file_free_security
,
3411 .file_ioctl
= smack_file_ioctl
,
3412 .file_lock
= smack_file_lock
,
3413 .file_fcntl
= smack_file_fcntl
,
3414 .file_mmap
= smack_file_mmap
,
3415 .file_set_fowner
= smack_file_set_fowner
,
3416 .file_send_sigiotask
= smack_file_send_sigiotask
,
3417 .file_receive
= smack_file_receive
,
3419 .cred_alloc_blank
= smack_cred_alloc_blank
,
3420 .cred_free
= smack_cred_free
,
3421 .cred_prepare
= smack_cred_prepare
,
3422 .cred_transfer
= smack_cred_transfer
,
3423 .kernel_act_as
= smack_kernel_act_as
,
3424 .kernel_create_files_as
= smack_kernel_create_files_as
,
3425 .task_setpgid
= smack_task_setpgid
,
3426 .task_getpgid
= smack_task_getpgid
,
3427 .task_getsid
= smack_task_getsid
,
3428 .task_getsecid
= smack_task_getsecid
,
3429 .task_setnice
= smack_task_setnice
,
3430 .task_setioprio
= smack_task_setioprio
,
3431 .task_getioprio
= smack_task_getioprio
,
3432 .task_setscheduler
= smack_task_setscheduler
,
3433 .task_getscheduler
= smack_task_getscheduler
,
3434 .task_movememory
= smack_task_movememory
,
3435 .task_kill
= smack_task_kill
,
3436 .task_wait
= smack_task_wait
,
3437 .task_to_inode
= smack_task_to_inode
,
3439 .ipc_permission
= smack_ipc_permission
,
3440 .ipc_getsecid
= smack_ipc_getsecid
,
3442 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
3443 .msg_msg_free_security
= smack_msg_msg_free_security
,
3445 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
3446 .msg_queue_free_security
= smack_msg_queue_free_security
,
3447 .msg_queue_associate
= smack_msg_queue_associate
,
3448 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
3449 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
3450 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
3452 .shm_alloc_security
= smack_shm_alloc_security
,
3453 .shm_free_security
= smack_shm_free_security
,
3454 .shm_associate
= smack_shm_associate
,
3455 .shm_shmctl
= smack_shm_shmctl
,
3456 .shm_shmat
= smack_shm_shmat
,
3458 .sem_alloc_security
= smack_sem_alloc_security
,
3459 .sem_free_security
= smack_sem_free_security
,
3460 .sem_associate
= smack_sem_associate
,
3461 .sem_semctl
= smack_sem_semctl
,
3462 .sem_semop
= smack_sem_semop
,
3464 .d_instantiate
= smack_d_instantiate
,
3466 .getprocattr
= smack_getprocattr
,
3467 .setprocattr
= smack_setprocattr
,
3469 .unix_stream_connect
= smack_unix_stream_connect
,
3470 .unix_may_send
= smack_unix_may_send
,
3472 .socket_post_create
= smack_socket_post_create
,
3473 .socket_connect
= smack_socket_connect
,
3474 .socket_sendmsg
= smack_socket_sendmsg
,
3475 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
3476 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
3477 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
3478 .sk_alloc_security
= smack_sk_alloc_security
,
3479 .sk_free_security
= smack_sk_free_security
,
3480 .sock_graft
= smack_sock_graft
,
3481 .inet_conn_request
= smack_inet_conn_request
,
3482 .inet_csk_clone
= smack_inet_csk_clone
,
3484 /* key management security hooks */
3486 .key_alloc
= smack_key_alloc
,
3487 .key_free
= smack_key_free
,
3488 .key_permission
= smack_key_permission
,
3489 #endif /* CONFIG_KEYS */
3493 .audit_rule_init
= smack_audit_rule_init
,
3494 .audit_rule_known
= smack_audit_rule_known
,
3495 .audit_rule_match
= smack_audit_rule_match
,
3496 .audit_rule_free
= smack_audit_rule_free
,
3497 #endif /* CONFIG_AUDIT */
3499 .secid_to_secctx
= smack_secid_to_secctx
,
3500 .secctx_to_secid
= smack_secctx_to_secid
,
3501 .release_secctx
= smack_release_secctx
,
3502 .inode_notifysecctx
= smack_inode_notifysecctx
,
3503 .inode_setsecctx
= smack_inode_setsecctx
,
3504 .inode_getsecctx
= smack_inode_getsecctx
,
3508 static __init
void init_smack_know_list(void)
3510 list_add(&smack_known_huh
.list
, &smack_known_list
);
3511 list_add(&smack_known_hat
.list
, &smack_known_list
);
3512 list_add(&smack_known_star
.list
, &smack_known_list
);
3513 list_add(&smack_known_floor
.list
, &smack_known_list
);
3514 list_add(&smack_known_invalid
.list
, &smack_known_list
);
3515 list_add(&smack_known_web
.list
, &smack_known_list
);
3519 * smack_init - initialize the smack system
3523 static __init
int smack_init(void)
3526 struct task_smack
*tsp
;
3528 if (!security_module_enable(&smack_ops
))
3531 tsp
= new_task_smack(smack_known_floor
.smk_known
,
3532 smack_known_floor
.smk_known
, GFP_KERNEL
);
3536 printk(KERN_INFO
"Smack: Initializing.\n");
3539 * Set the security state for the initial task.
3541 cred
= (struct cred
*) current
->cred
;
3542 cred
->security
= tsp
;
3544 /* initialize the smack_know_list */
3545 init_smack_know_list();
3549 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
3550 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
3551 spin_lock_init(&smack_known_star
.smk_cipsolock
);
3552 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
3553 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
3558 if (register_security(&smack_ops
))
3559 panic("smack: Unable to register with kernel.\n");
3565 * Smack requires early initialization in order to label
3566 * all processes and objects when they are created.
3568 security_initcall(smack_init
);