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/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
46 #define task_security(task) (task_cred_xxx((task), security))
48 #define TRANS_TRUE "TRUE"
49 #define TRANS_TRUE_SIZE 4
51 #define SMK_CONNECTING 0
52 #define SMK_RECEIVING 1
55 LIST_HEAD(smk_ipv6_port_list
);
57 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
58 static void smk_bu_mode(int mode
, char *s
)
68 if (mode
& MAY_APPEND
)
70 if (mode
& MAY_TRANSMUTE
)
80 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
81 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
82 struct smack_known
*oskp
, int mode
, int rc
)
84 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
89 smk_bu_mode(mode
, acc
);
90 pr_info("Smack Bringup: (%s %s %s) %s\n",
91 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
95 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
98 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
99 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
102 struct task_smack
*tsp
= current_security();
103 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
108 smk_bu_mode(mode
, acc
);
109 pr_info("Smack Bringup: (%s %s %s) %s %s\n",
110 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
111 acc
, current
->comm
, note
);
115 #define smk_bu_current(note, oskp, mode, RC) (RC)
118 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
119 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
121 struct task_smack
*tsp
= current_security();
122 struct task_smack
*otsp
= task_security(otp
);
123 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
128 smk_bu_mode(mode
, acc
);
129 pr_info("Smack Bringup: (%s %s %s) %s to %s\n",
130 tsp
->smk_task
->smk_known
, otsp
->smk_task
->smk_known
, acc
,
131 current
->comm
, otp
->comm
);
135 #define smk_bu_task(otp, mode, RC) (RC)
138 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
139 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
141 struct task_smack
*tsp
= current_security();
142 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
147 smk_bu_mode(mode
, acc
);
148 pr_info("Smack Bringup: (%s %s %s) inode=(%s %ld) %s\n",
149 tsp
->smk_task
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
150 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
154 #define smk_bu_inode(inode, mode, RC) (RC)
157 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
158 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
160 struct task_smack
*tsp
= current_security();
161 struct smack_known
*sskp
= tsp
->smk_task
;
162 struct inode
*inode
= file
->f_inode
;
163 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
168 smk_bu_mode(mode
, acc
);
169 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
170 sskp
->smk_known
, (char *)file
->f_security
, acc
,
171 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
176 #define smk_bu_file(file, mode, RC) (RC)
179 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
180 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
183 struct task_smack
*tsp
= cred
->security
;
184 struct smack_known
*sskp
= tsp
->smk_task
;
185 struct inode
*inode
= file
->f_inode
;
186 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
191 smk_bu_mode(mode
, acc
);
192 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
193 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
194 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
199 #define smk_bu_credfile(cred, file, mode, RC) (RC)
203 * smk_fetch - Fetch the smack label from a file.
204 * @ip: a pointer to the inode
205 * @dp: a pointer to the dentry
207 * Returns a pointer to the master list entry for the Smack label
208 * or NULL if there was no label to fetch.
210 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
215 struct smack_known
*skp
= NULL
;
217 if (ip
->i_op
->getxattr
== NULL
)
220 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
224 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
226 skp
= smk_import_entry(buffer
, rc
);
234 * new_inode_smack - allocate an inode security blob
235 * @skp: a pointer to the Smack label entry to use in the blob
237 * Returns the new blob or NULL if there's no memory available
239 struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
241 struct inode_smack
*isp
;
243 isp
= kzalloc(sizeof(struct inode_smack
), GFP_NOFS
);
247 isp
->smk_inode
= skp
;
249 mutex_init(&isp
->smk_lock
);
255 * new_task_smack - allocate a task security blob
256 * @smack: a pointer to the Smack label to use in the blob
258 * Returns the new blob or NULL if there's no memory available
260 static struct task_smack
*new_task_smack(struct smack_known
*task
,
261 struct smack_known
*forked
, gfp_t gfp
)
263 struct task_smack
*tsp
;
265 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
269 tsp
->smk_task
= task
;
270 tsp
->smk_forked
= forked
;
271 INIT_LIST_HEAD(&tsp
->smk_rules
);
272 mutex_init(&tsp
->smk_rules_lock
);
278 * smk_copy_rules - copy a rule set
279 * @nhead - new rules header pointer
280 * @ohead - old rules header pointer
282 * Returns 0 on success, -ENOMEM on error
284 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
287 struct smack_rule
*nrp
;
288 struct smack_rule
*orp
;
291 INIT_LIST_HEAD(nhead
);
293 list_for_each_entry_rcu(orp
, ohead
, list
) {
294 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
300 list_add_rcu(&nrp
->list
, nhead
);
306 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
307 * @mode - input mode in form of PTRACE_MODE_*
309 * Returns a converted MAY_* mode usable by smack rules
311 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
314 case PTRACE_MODE_READ
:
316 case PTRACE_MODE_ATTACH
:
317 return MAY_READWRITE
;
324 * smk_ptrace_rule_check - helper for ptrace access
325 * @tracer: tracer process
326 * @tracee_known: label entry of the process that's about to be traced
327 * @mode: ptrace attachment mode (PTRACE_MODE_*)
328 * @func: name of the function that called us, used for audit
330 * Returns 0 on access granted, -error on error
332 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
333 struct smack_known
*tracee_known
,
334 unsigned int mode
, const char *func
)
337 struct smk_audit_info ad
, *saip
= NULL
;
338 struct task_smack
*tsp
;
339 struct smack_known
*tracer_known
;
341 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
342 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
343 smk_ad_setfield_u_tsk(&ad
, tracer
);
347 tsp
= task_security(tracer
);
348 tracer_known
= smk_of_task(tsp
);
350 if ((mode
& PTRACE_MODE_ATTACH
) &&
351 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
352 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
353 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
355 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
357 else if (capable(CAP_SYS_PTRACE
))
363 smack_log(tracer_known
->smk_known
,
364 tracee_known
->smk_known
,
370 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
371 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
377 * We he, that is fun!
381 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
382 * @ctp: child task pointer
383 * @mode: ptrace attachment mode (PTRACE_MODE_*)
385 * Returns 0 if access is OK, an error code otherwise
387 * Do the capability checks.
389 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
392 struct smack_known
*skp
;
394 rc
= cap_ptrace_access_check(ctp
, mode
);
398 skp
= smk_of_task(task_security(ctp
));
400 rc
= smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
405 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
406 * @ptp: parent task pointer
408 * Returns 0 if access is OK, an error code otherwise
410 * Do the capability checks, and require PTRACE_MODE_ATTACH.
412 static int smack_ptrace_traceme(struct task_struct
*ptp
)
415 struct smack_known
*skp
;
417 rc
= cap_ptrace_traceme(ptp
);
421 skp
= smk_of_task(current_security());
423 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
428 * smack_syslog - Smack approval on syslog
429 * @type: message type
431 * Returns 0 on success, error code otherwise.
433 static int smack_syslog(int typefrom_file
)
436 struct smack_known
*skp
= smk_of_current();
438 if (smack_privileged(CAP_MAC_OVERRIDE
))
441 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
453 * smack_sb_alloc_security - allocate a superblock blob
454 * @sb: the superblock getting the blob
456 * Returns 0 on success or -ENOMEM on error.
458 static int smack_sb_alloc_security(struct super_block
*sb
)
460 struct superblock_smack
*sbsp
;
462 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
467 sbsp
->smk_root
= &smack_known_floor
;
468 sbsp
->smk_default
= &smack_known_floor
;
469 sbsp
->smk_floor
= &smack_known_floor
;
470 sbsp
->smk_hat
= &smack_known_hat
;
472 * smk_initialized will be zero from kzalloc.
474 sb
->s_security
= sbsp
;
480 * smack_sb_free_security - free a superblock blob
481 * @sb: the superblock getting the blob
484 static void smack_sb_free_security(struct super_block
*sb
)
486 kfree(sb
->s_security
);
487 sb
->s_security
= NULL
;
491 * smack_sb_copy_data - copy mount options data for processing
492 * @orig: where to start
493 * @smackopts: mount options string
495 * Returns 0 on success or -ENOMEM on error.
497 * Copy the Smack specific mount options out of the mount
500 static int smack_sb_copy_data(char *orig
, char *smackopts
)
502 char *cp
, *commap
, *otheropts
, *dp
;
504 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
505 if (otheropts
== NULL
)
508 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
509 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
511 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
513 else if (strstr(cp
, SMK_FSHAT
) == cp
)
515 else if (strstr(cp
, SMK_FSROOT
) == cp
)
517 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
522 commap
= strchr(cp
, ',');
531 strcpy(orig
, otheropts
);
532 free_page((unsigned long)otheropts
);
538 * smack_sb_kern_mount - Smack specific mount processing
539 * @sb: the file system superblock
540 * @flags: the mount flags
541 * @data: the smack mount options
543 * Returns 0 on success, an error code on failure
545 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
547 struct dentry
*root
= sb
->s_root
;
548 struct inode
*inode
= root
->d_inode
;
549 struct superblock_smack
*sp
= sb
->s_security
;
550 struct inode_smack
*isp
;
551 struct smack_known
*skp
;
557 if (sp
->smk_initialized
)
560 sp
->smk_initialized
= 1;
562 for (op
= data
; op
!= NULL
; op
= commap
) {
563 commap
= strchr(op
, ',');
567 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
568 op
+= strlen(SMK_FSHAT
);
569 skp
= smk_import_entry(op
, 0);
574 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
575 op
+= strlen(SMK_FSFLOOR
);
576 skp
= smk_import_entry(op
, 0);
581 } else if (strncmp(op
, SMK_FSDEFAULT
,
582 strlen(SMK_FSDEFAULT
)) == 0) {
583 op
+= strlen(SMK_FSDEFAULT
);
584 skp
= smk_import_entry(op
, 0);
586 sp
->smk_default
= skp
;
589 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
590 op
+= strlen(SMK_FSROOT
);
591 skp
= smk_import_entry(op
, 0);
596 } else if (strncmp(op
, SMK_FSTRANS
, strlen(SMK_FSTRANS
)) == 0) {
597 op
+= strlen(SMK_FSTRANS
);
598 skp
= smk_import_entry(op
, 0);
607 if (!smack_privileged(CAP_MAC_ADMIN
)) {
609 * Unprivileged mounts don't get to specify Smack values.
614 * Unprivileged mounts get root and default from the caller.
616 skp
= smk_of_current();
618 sp
->smk_default
= skp
;
621 * Initialize the root inode.
623 isp
= inode
->i_security
;
625 isp
= new_inode_smack(sp
->smk_root
);
628 inode
->i_security
= isp
;
630 isp
->smk_inode
= sp
->smk_root
;
633 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
639 * smack_sb_statfs - Smack check on statfs
640 * @dentry: identifies the file system in question
642 * Returns 0 if current can read the floor of the filesystem,
643 * and error code otherwise
645 static int smack_sb_statfs(struct dentry
*dentry
)
647 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
649 struct smk_audit_info ad
;
651 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
652 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
654 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
655 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
664 * smack_bprm_set_creds - set creds for exec
665 * @bprm: the exec information
667 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
669 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
671 struct inode
*inode
= file_inode(bprm
->file
);
672 struct task_smack
*bsp
= bprm
->cred
->security
;
673 struct inode_smack
*isp
;
676 rc
= cap_bprm_set_creds(bprm
);
680 if (bprm
->cred_prepared
)
683 isp
= inode
->i_security
;
684 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
687 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
688 struct task_struct
*tracer
;
692 tracer
= ptrace_parent(current
);
693 if (likely(tracer
!= NULL
))
694 rc
= smk_ptrace_rule_check(tracer
,
702 } else if (bprm
->unsafe
)
705 bsp
->smk_task
= isp
->smk_task
;
706 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
712 * smack_bprm_committing_creds - Prepare to install the new credentials
715 * @bprm: binprm for exec
717 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
719 struct task_smack
*bsp
= bprm
->cred
->security
;
721 if (bsp
->smk_task
!= bsp
->smk_forked
)
722 current
->pdeath_signal
= 0;
726 * smack_bprm_secureexec - Return the decision to use secureexec.
727 * @bprm: binprm for exec
729 * Returns 0 on success.
731 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
733 struct task_smack
*tsp
= current_security();
734 int ret
= cap_bprm_secureexec(bprm
);
736 if (!ret
&& (tsp
->smk_task
!= tsp
->smk_forked
))
747 * smack_inode_alloc_security - allocate an inode blob
748 * @inode: the inode in need of a blob
750 * Returns 0 if it gets a blob, -ENOMEM otherwise
752 static int smack_inode_alloc_security(struct inode
*inode
)
754 struct smack_known
*skp
= smk_of_current();
756 inode
->i_security
= new_inode_smack(skp
);
757 if (inode
->i_security
== NULL
)
763 * smack_inode_free_security - free an inode blob
764 * @inode: the inode with a blob
766 * Clears the blob pointer in inode
768 static void smack_inode_free_security(struct inode
*inode
)
770 kfree(inode
->i_security
);
771 inode
->i_security
= NULL
;
775 * smack_inode_init_security - copy out the smack from an inode
776 * @inode: the newly created inode
777 * @dir: containing directory object
779 * @name: where to put the attribute name
780 * @value: where to put the attribute value
781 * @len: where to put the length of the attribute
783 * Returns 0 if it all works out, -ENOMEM if there's no memory
785 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
786 const struct qstr
*qstr
, const char **name
,
787 void **value
, size_t *len
)
789 struct inode_smack
*issp
= inode
->i_security
;
790 struct smack_known
*skp
= smk_of_current();
791 struct smack_known
*isp
= smk_of_inode(inode
);
792 struct smack_known
*dsp
= smk_of_inode(dir
);
796 *name
= XATTR_SMACK_SUFFIX
;
800 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
805 * If the access rule allows transmutation and
806 * the directory requests transmutation then
807 * by all means transmute.
808 * Mark the inode as changed.
810 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
811 smk_inode_transmutable(dir
)) {
813 issp
->smk_flags
|= SMK_INODE_CHANGED
;
816 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
822 *len
= strlen(isp
->smk_known
);
828 * smack_inode_link - Smack check on link
829 * @old_dentry: the existing object
831 * @new_dentry: the new object
833 * Returns 0 if access is permitted, an error code otherwise
835 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
836 struct dentry
*new_dentry
)
838 struct smack_known
*isp
;
839 struct smk_audit_info ad
;
842 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
843 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
845 isp
= smk_of_inode(old_dentry
->d_inode
);
846 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
847 rc
= smk_bu_inode(old_dentry
->d_inode
, MAY_WRITE
, rc
);
849 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
850 isp
= smk_of_inode(new_dentry
->d_inode
);
851 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
852 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
853 rc
= smk_bu_inode(new_dentry
->d_inode
, MAY_WRITE
, rc
);
860 * smack_inode_unlink - Smack check on inode deletion
861 * @dir: containing directory object
862 * @dentry: file to unlink
864 * Returns 0 if current can write the containing directory
865 * and the object, error code otherwise
867 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
869 struct inode
*ip
= dentry
->d_inode
;
870 struct smk_audit_info ad
;
873 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
874 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
877 * You need write access to the thing you're unlinking
879 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
880 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
883 * You also need write access to the containing directory
885 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
886 smk_ad_setfield_u_fs_inode(&ad
, dir
);
887 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
888 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
894 * smack_inode_rmdir - Smack check on directory deletion
895 * @dir: containing directory object
896 * @dentry: directory to unlink
898 * Returns 0 if current can write the containing directory
899 * and the directory, error code otherwise
901 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
903 struct smk_audit_info ad
;
906 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
907 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
910 * You need write access to the thing you're removing
912 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
913 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
916 * You also need write access to the containing directory
918 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
919 smk_ad_setfield_u_fs_inode(&ad
, dir
);
920 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
921 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
928 * smack_inode_rename - Smack check on rename
930 * @old_dentry: the old object
932 * @new_dentry: the new object
934 * Read and write access is required on both the old and
937 * Returns 0 if access is permitted, an error code otherwise
939 static int smack_inode_rename(struct inode
*old_inode
,
940 struct dentry
*old_dentry
,
941 struct inode
*new_inode
,
942 struct dentry
*new_dentry
)
945 struct smack_known
*isp
;
946 struct smk_audit_info ad
;
948 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
949 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
951 isp
= smk_of_inode(old_dentry
->d_inode
);
952 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
953 rc
= smk_bu_inode(old_dentry
->d_inode
, MAY_READWRITE
, rc
);
955 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
956 isp
= smk_of_inode(new_dentry
->d_inode
);
957 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
958 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
959 rc
= smk_bu_inode(new_dentry
->d_inode
, MAY_READWRITE
, rc
);
965 * smack_inode_permission - Smack version of permission()
966 * @inode: the inode in question
967 * @mask: the access requested
969 * This is the important Smack hook.
971 * Returns 0 if access is permitted, -EACCES otherwise
973 static int smack_inode_permission(struct inode
*inode
, int mask
)
975 struct smk_audit_info ad
;
976 int no_block
= mask
& MAY_NOT_BLOCK
;
979 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
981 * No permission to check. Existence test. Yup, it's there.
986 /* May be droppable after audit */
989 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
990 smk_ad_setfield_u_fs_inode(&ad
, inode
);
991 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
992 rc
= smk_bu_inode(inode
, mask
, rc
);
997 * smack_inode_setattr - Smack check for setting attributes
998 * @dentry: the object
999 * @iattr: for the force flag
1001 * Returns 0 if access is permitted, an error code otherwise
1003 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1005 struct smk_audit_info ad
;
1009 * Need to allow for clearing the setuid bit.
1011 if (iattr
->ia_valid
& ATTR_FORCE
)
1013 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1014 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1016 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1017 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1022 * smack_inode_getattr - Smack check for getting attributes
1023 * @mnt: vfsmount of the object
1024 * @dentry: the object
1026 * Returns 0 if access is permitted, an error code otherwise
1028 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
1030 struct smk_audit_info ad
;
1034 path
.dentry
= dentry
;
1037 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1038 smk_ad_setfield_u_fs_path(&ad
, path
);
1039 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
1040 rc
= smk_bu_inode(dentry
->d_inode
, MAY_READ
, rc
);
1045 * smack_inode_setxattr - Smack check for setting xattrs
1046 * @dentry: the object
1047 * @name: name of the attribute
1048 * @value: value of the attribute
1049 * @size: size of the value
1052 * This protects the Smack attribute explicitly.
1054 * Returns 0 if access is permitted, an error code otherwise
1056 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1057 const void *value
, size_t size
, int flags
)
1059 struct smk_audit_info ad
;
1060 struct smack_known
*skp
;
1062 int check_import
= 0;
1067 * Check label validity here so import won't fail in post_setxattr
1069 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1070 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1071 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1074 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1075 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1079 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1081 if (size
!= TRANS_TRUE_SIZE
||
1082 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1085 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1087 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1090 if (rc
== 0 && check_import
) {
1091 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1092 if (skp
== NULL
|| (check_star
&&
1093 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1097 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1098 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1101 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1102 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1109 * smack_inode_post_setxattr - Apply the Smack update approved above
1111 * @name: attribute name
1112 * @value: attribute value
1113 * @size: attribute size
1116 * Set the pointer in the inode blob to the entry found
1117 * in the master label list.
1119 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1120 const void *value
, size_t size
, int flags
)
1122 struct smack_known
*skp
;
1123 struct inode_smack
*isp
= dentry
->d_inode
->i_security
;
1125 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1126 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1130 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1131 skp
= smk_import_entry(value
, size
);
1133 isp
->smk_inode
= skp
;
1135 isp
->smk_inode
= &smack_known_invalid
;
1136 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1137 skp
= smk_import_entry(value
, size
);
1139 isp
->smk_task
= skp
;
1141 isp
->smk_task
= &smack_known_invalid
;
1142 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1143 skp
= smk_import_entry(value
, size
);
1145 isp
->smk_mmap
= skp
;
1147 isp
->smk_mmap
= &smack_known_invalid
;
1154 * smack_inode_getxattr - Smack check on getxattr
1155 * @dentry: the object
1158 * Returns 0 if access is permitted, an error code otherwise
1160 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1162 struct smk_audit_info ad
;
1165 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1166 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1168 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
1169 rc
= smk_bu_inode(dentry
->d_inode
, MAY_READ
, rc
);
1174 * smack_inode_removexattr - Smack check on removexattr
1175 * @dentry: the object
1176 * @name: name of the attribute
1178 * Removing the Smack attribute requires CAP_MAC_ADMIN
1180 * Returns 0 if access is permitted, an error code otherwise
1182 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1184 struct inode_smack
*isp
;
1185 struct smk_audit_info ad
;
1188 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1189 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1190 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1191 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1192 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1193 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1194 if (!smack_privileged(CAP_MAC_ADMIN
))
1197 rc
= cap_inode_removexattr(dentry
, name
);
1202 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1203 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1205 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1206 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1210 isp
= dentry
->d_inode
->i_security
;
1212 * Don't do anything special for these.
1213 * XATTR_NAME_SMACKIPIN
1214 * XATTR_NAME_SMACKIPOUT
1215 * XATTR_NAME_SMACKEXEC
1217 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1218 isp
->smk_task
= NULL
;
1219 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1220 isp
->smk_mmap
= NULL
;
1221 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1222 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1228 * smack_inode_getsecurity - get smack xattrs
1229 * @inode: the object
1230 * @name: attribute name
1231 * @buffer: where to put the result
1234 * Returns the size of the attribute or an error code
1236 static int smack_inode_getsecurity(const struct inode
*inode
,
1237 const char *name
, void **buffer
,
1240 struct socket_smack
*ssp
;
1241 struct socket
*sock
;
1242 struct super_block
*sbp
;
1243 struct inode
*ip
= (struct inode
*)inode
;
1244 struct smack_known
*isp
;
1248 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1249 isp
= smk_of_inode(inode
);
1250 ilen
= strlen(isp
->smk_known
);
1251 *buffer
= isp
->smk_known
;
1256 * The rest of the Smack xattrs are only on sockets.
1259 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1262 sock
= SOCKET_I(ip
);
1263 if (sock
== NULL
|| sock
->sk
== NULL
)
1266 ssp
= sock
->sk
->sk_security
;
1268 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1270 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1275 ilen
= strlen(isp
->smk_known
);
1277 *buffer
= isp
->smk_known
;
1286 * smack_inode_listsecurity - list the Smack attributes
1287 * @inode: the object
1288 * @buffer: where they go
1289 * @buffer_size: size of buffer
1291 * Returns 0 on success, -EINVAL otherwise
1293 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1296 int len
= sizeof(XATTR_NAME_SMACK
);
1298 if (buffer
!= NULL
&& len
<= buffer_size
)
1299 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1305 * smack_inode_getsecid - Extract inode's security id
1306 * @inode: inode to extract the info from
1307 * @secid: where result will be saved
1309 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1311 struct inode_smack
*isp
= inode
->i_security
;
1313 *secid
= isp
->smk_inode
->smk_secid
;
1321 * smack_file_permission - Smack check on file operations
1327 * Should access checks be done on each read or write?
1328 * UNICOS and SELinux say yes.
1329 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1331 * I'll say no for now. Smack does not do the frequent
1332 * label changing that SELinux does.
1334 static int smack_file_permission(struct file
*file
, int mask
)
1340 * smack_file_alloc_security - assign a file security blob
1343 * The security blob for a file is a pointer to the master
1344 * label list, so no allocation is done.
1348 static int smack_file_alloc_security(struct file
*file
)
1350 struct smack_known
*skp
= smk_of_current();
1352 file
->f_security
= skp
;
1357 * smack_file_free_security - clear a file security blob
1360 * The security blob for a file is a pointer to the master
1361 * label list, so no memory is freed.
1363 static void smack_file_free_security(struct file
*file
)
1365 file
->f_security
= NULL
;
1369 * smack_file_ioctl - Smack check on ioctls
1374 * Relies heavily on the correct use of the ioctl command conventions.
1376 * Returns 0 if allowed, error code otherwise
1378 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1382 struct smk_audit_info ad
;
1384 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1385 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1387 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1388 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1389 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1392 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1393 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1394 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1401 * smack_file_lock - Smack check on file locking
1405 * Returns 0 if current has lock access, error code otherwise
1407 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1409 struct smk_audit_info ad
;
1412 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1413 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1414 rc
= smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1415 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1420 * smack_file_fcntl - Smack check on fcntl
1422 * @cmd: what action to check
1425 * Generally these operations are harmless.
1426 * File locking operations present an obvious mechanism
1427 * for passing information, so they require write access.
1429 * Returns 0 if current has access, error code otherwise
1431 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1434 struct smk_audit_info ad
;
1443 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1444 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1445 rc
= smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1446 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1450 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1451 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1452 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1453 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1464 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1465 * if mapping anonymous memory.
1466 * @file contains the file structure for file to map (may be NULL).
1467 * @reqprot contains the protection requested by the application.
1468 * @prot contains the protection that will be applied by the kernel.
1469 * @flags contains the operational flags.
1470 * Return 0 if permission is granted.
1472 static int smack_mmap_file(struct file
*file
,
1473 unsigned long reqprot
, unsigned long prot
,
1474 unsigned long flags
)
1476 struct smack_known
*skp
;
1477 struct smack_known
*mkp
;
1478 struct smack_rule
*srp
;
1479 struct task_smack
*tsp
;
1480 struct smack_known
*okp
;
1481 struct inode_smack
*isp
;
1490 isp
= file_inode(file
)->i_security
;
1491 if (isp
->smk_mmap
== NULL
)
1493 mkp
= isp
->smk_mmap
;
1495 tsp
= current_security();
1496 skp
= smk_of_current();
1501 * For each Smack rule associated with the subject
1502 * label verify that the SMACK64MMAP also has access
1503 * to that rule's object label.
1505 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1506 okp
= srp
->smk_object
;
1508 * Matching labels always allows access.
1510 if (mkp
->smk_known
== okp
->smk_known
)
1513 * If there is a matching local rule take
1514 * that into account as well.
1516 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1520 may
= srp
->smk_access
;
1522 may
&= srp
->smk_access
;
1524 * If may is zero the SMACK64MMAP subject can't
1525 * possibly have less access.
1531 * Fetch the global list entry.
1532 * If there isn't one a SMACK64MMAP subject
1533 * can't have as much access as current.
1535 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1537 if (mmay
== -ENOENT
) {
1542 * If there is a local entry it modifies the
1543 * potential access, too.
1545 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1547 if (tmay
!= -ENOENT
)
1551 * If there is any access available to current that is
1552 * not available to a SMACK64MMAP subject
1555 if ((may
| mmay
) != mmay
) {
1567 * smack_file_set_fowner - set the file security blob value
1568 * @file: object in question
1571 * Further research may be required on this one.
1573 static void smack_file_set_fowner(struct file
*file
)
1575 struct smack_known
*skp
= smk_of_current();
1577 file
->f_security
= skp
;
1581 * smack_file_send_sigiotask - Smack on sigio
1582 * @tsk: The target task
1583 * @fown: the object the signal come from
1586 * Allow a privileged task to get signals even if it shouldn't
1588 * Returns 0 if a subject with the object's smack could
1589 * write to the task, an error code otherwise.
1591 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1592 struct fown_struct
*fown
, int signum
)
1594 struct smack_known
*skp
;
1595 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1598 struct smk_audit_info ad
;
1601 * struct fown_struct is never outside the context of a struct file
1603 file
= container_of(fown
, struct file
, f_owner
);
1605 /* we don't log here as rc can be overriden */
1606 skp
= file
->f_security
;
1607 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1608 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1609 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1612 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1613 smk_ad_setfield_u_tsk(&ad
, tsk
);
1614 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1619 * smack_file_receive - Smack file receive check
1622 * Returns 0 if current has access, error code otherwise
1624 static int smack_file_receive(struct file
*file
)
1628 struct smk_audit_info ad
;
1630 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1631 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1633 * This code relies on bitmasks.
1635 if (file
->f_mode
& FMODE_READ
)
1637 if (file
->f_mode
& FMODE_WRITE
)
1640 rc
= smk_curacc(file
->f_security
, may
, &ad
);
1641 rc
= smk_bu_file(file
, may
, rc
);
1646 * smack_file_open - Smack dentry open processing
1648 * @cred: task credential
1650 * Set the security blob in the file structure.
1651 * Allow the open only if the task has read access. There are
1652 * many read operations (e.g. fstat) that you can do with an
1653 * fd even if you have the file open write-only.
1657 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1659 struct task_smack
*tsp
= cred
->security
;
1660 struct inode_smack
*isp
= file_inode(file
)->i_security
;
1661 struct smk_audit_info ad
;
1664 if (smack_privileged(CAP_MAC_OVERRIDE
)) {
1665 file
->f_security
= isp
->smk_inode
;
1669 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1670 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1671 rc
= smk_access(tsp
->smk_task
, isp
->smk_inode
, MAY_READ
, &ad
);
1672 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1674 file
->f_security
= isp
->smk_inode
;
1684 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1685 * @new: the new credentials
1686 * @gfp: the atomicity of any memory allocations
1688 * Prepare a blank set of credentials for modification. This must allocate all
1689 * the memory the LSM module might require such that cred_transfer() can
1690 * complete without error.
1692 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1694 struct task_smack
*tsp
;
1696 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1700 cred
->security
= tsp
;
1707 * smack_cred_free - "free" task-level security credentials
1708 * @cred: the credentials in question
1711 static void smack_cred_free(struct cred
*cred
)
1713 struct task_smack
*tsp
= cred
->security
;
1714 struct smack_rule
*rp
;
1715 struct list_head
*l
;
1716 struct list_head
*n
;
1720 cred
->security
= NULL
;
1722 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1723 rp
= list_entry(l
, struct smack_rule
, list
);
1724 list_del(&rp
->list
);
1731 * smack_cred_prepare - prepare new set of credentials for modification
1732 * @new: the new credentials
1733 * @old: the original credentials
1734 * @gfp: the atomicity of any memory allocations
1736 * Prepare a new set of credentials for modification.
1738 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1741 struct task_smack
*old_tsp
= old
->security
;
1742 struct task_smack
*new_tsp
;
1745 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1746 if (new_tsp
== NULL
)
1749 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1753 new->security
= new_tsp
;
1758 * smack_cred_transfer - Transfer the old credentials to the new credentials
1759 * @new: the new credentials
1760 * @old: the original credentials
1762 * Fill in a set of blank credentials from another set of credentials.
1764 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1766 struct task_smack
*old_tsp
= old
->security
;
1767 struct task_smack
*new_tsp
= new->security
;
1769 new_tsp
->smk_task
= old_tsp
->smk_task
;
1770 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1771 mutex_init(&new_tsp
->smk_rules_lock
);
1772 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1775 /* cbs copy rule list */
1779 * smack_kernel_act_as - Set the subjective context in a set of credentials
1780 * @new: points to the set of credentials to be modified.
1781 * @secid: specifies the security ID to be set
1783 * Set the security data for a kernel service.
1785 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1787 struct task_smack
*new_tsp
= new->security
;
1788 struct smack_known
*skp
= smack_from_secid(secid
);
1793 new_tsp
->smk_task
= skp
;
1798 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1799 * @new: points to the set of credentials to be modified
1800 * @inode: points to the inode to use as a reference
1802 * Set the file creation context in a set of credentials to the same
1803 * as the objective context of the specified inode
1805 static int smack_kernel_create_files_as(struct cred
*new,
1806 struct inode
*inode
)
1808 struct inode_smack
*isp
= inode
->i_security
;
1809 struct task_smack
*tsp
= new->security
;
1811 tsp
->smk_forked
= isp
->smk_inode
;
1812 tsp
->smk_task
= tsp
->smk_forked
;
1817 * smk_curacc_on_task - helper to log task related access
1818 * @p: the task object
1819 * @access: the access requested
1820 * @caller: name of the calling function for audit
1822 * Return 0 if access is permitted
1824 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
1827 struct smk_audit_info ad
;
1828 struct smack_known
*skp
= smk_of_task(task_security(p
));
1831 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
1832 smk_ad_setfield_u_tsk(&ad
, p
);
1833 rc
= smk_curacc(skp
, access
, &ad
);
1834 rc
= smk_bu_task(p
, access
, rc
);
1839 * smack_task_setpgid - Smack check on setting pgid
1840 * @p: the task object
1843 * Return 0 if write access is permitted
1845 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1847 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1851 * smack_task_getpgid - Smack access check for getpgid
1852 * @p: the object task
1854 * Returns 0 if current can read the object task, error code otherwise
1856 static int smack_task_getpgid(struct task_struct
*p
)
1858 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1862 * smack_task_getsid - Smack access check for getsid
1863 * @p: the object task
1865 * Returns 0 if current can read the object task, error code otherwise
1867 static int smack_task_getsid(struct task_struct
*p
)
1869 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1873 * smack_task_getsecid - get the secid of the task
1874 * @p: the object task
1875 * @secid: where to put the result
1877 * Sets the secid to contain a u32 version of the smack label.
1879 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1881 struct smack_known
*skp
= smk_of_task(task_security(p
));
1883 *secid
= skp
->smk_secid
;
1887 * smack_task_setnice - Smack check on setting nice
1888 * @p: the task object
1891 * Return 0 if write access is permitted
1893 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1897 rc
= cap_task_setnice(p
, nice
);
1899 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1904 * smack_task_setioprio - Smack check on setting ioprio
1905 * @p: the task object
1908 * Return 0 if write access is permitted
1910 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1914 rc
= cap_task_setioprio(p
, ioprio
);
1916 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1921 * smack_task_getioprio - Smack check on reading ioprio
1922 * @p: the task object
1924 * Return 0 if read access is permitted
1926 static int smack_task_getioprio(struct task_struct
*p
)
1928 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1932 * smack_task_setscheduler - Smack check on setting scheduler
1933 * @p: the task object
1937 * Return 0 if read access is permitted
1939 static int smack_task_setscheduler(struct task_struct
*p
)
1943 rc
= cap_task_setscheduler(p
);
1945 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1950 * smack_task_getscheduler - Smack check on reading scheduler
1951 * @p: the task object
1953 * Return 0 if read access is permitted
1955 static int smack_task_getscheduler(struct task_struct
*p
)
1957 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1961 * smack_task_movememory - Smack check on moving memory
1962 * @p: the task object
1964 * Return 0 if write access is permitted
1966 static int smack_task_movememory(struct task_struct
*p
)
1968 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1972 * smack_task_kill - Smack check on signal delivery
1973 * @p: the task object
1976 * @secid: identifies the smack to use in lieu of current's
1978 * Return 0 if write access is permitted
1980 * The secid behavior is an artifact of an SELinux hack
1981 * in the USB code. Someday it may go away.
1983 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1986 struct smk_audit_info ad
;
1987 struct smack_known
*skp
;
1988 struct smack_known
*tkp
= smk_of_task(task_security(p
));
1991 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1992 smk_ad_setfield_u_tsk(&ad
, p
);
1994 * Sending a signal requires that the sender
1995 * can write the receiver.
1998 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
1999 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2003 * If the secid isn't 0 we're dealing with some USB IO
2004 * specific behavior. This is not clean. For one thing
2005 * we can't take privilege into account.
2007 skp
= smack_from_secid(secid
);
2008 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2009 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2014 * smack_task_wait - Smack access check for waiting
2015 * @p: task to wait for
2019 static int smack_task_wait(struct task_struct
*p
)
2022 * Allow the operation to succeed.
2024 * In userless environments (e.g. phones) programs
2025 * get marked with SMACK64EXEC and even if the parent
2026 * and child shouldn't be talking the parent still
2027 * may expect to know when the child exits.
2033 * smack_task_to_inode - copy task smack into the inode blob
2034 * @p: task to copy from
2035 * @inode: inode to copy to
2037 * Sets the smack pointer in the inode security blob
2039 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2041 struct inode_smack
*isp
= inode
->i_security
;
2042 struct smack_known
*skp
= smk_of_task(task_security(p
));
2044 isp
->smk_inode
= skp
;
2052 * smack_sk_alloc_security - Allocate a socket blob
2055 * @gfp_flags: memory allocation flags
2057 * Assign Smack pointers to current
2059 * Returns 0 on success, -ENOMEM is there's no memory
2061 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2063 struct smack_known
*skp
= smk_of_current();
2064 struct socket_smack
*ssp
;
2066 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2072 ssp
->smk_packet
= NULL
;
2074 sk
->sk_security
= ssp
;
2080 * smack_sk_free_security - Free a socket blob
2083 * Clears the blob pointer
2085 static void smack_sk_free_security(struct sock
*sk
)
2087 kfree(sk
->sk_security
);
2091 * smack_host_label - check host based restrictions
2092 * @sip: the object end
2094 * looks for host based access restrictions
2096 * This version will only be appropriate for really small sets of single label
2097 * hosts. The caller is responsible for ensuring that the RCU read lock is
2098 * taken before calling this function.
2100 * Returns the label of the far end or NULL if it's not special.
2102 static struct smack_known
*smack_host_label(struct sockaddr_in
*sip
)
2104 struct smk_netlbladdr
*snp
;
2105 struct in_addr
*siap
= &sip
->sin_addr
;
2107 if (siap
->s_addr
== 0)
2110 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
2112 * we break after finding the first match because
2113 * the list is sorted from longest to shortest mask
2114 * so we have found the most specific match
2116 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
2117 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
2118 /* we have found the special CIPSO option */
2119 if (snp
->smk_label
== &smack_cipso_option
)
2121 return snp
->smk_label
;
2128 * smack_netlabel - Set the secattr on a socket
2130 * @labeled: socket label scheme
2132 * Convert the outbound smack value (smk_out) to a
2133 * secattr and attach it to the socket.
2135 * Returns 0 on success or an error code
2137 static int smack_netlabel(struct sock
*sk
, int labeled
)
2139 struct smack_known
*skp
;
2140 struct socket_smack
*ssp
= sk
->sk_security
;
2144 * Usually the netlabel code will handle changing the
2145 * packet labeling based on the label.
2146 * The case of a single label host is different, because
2147 * a single label host should never get a labeled packet
2148 * even though the label is usually associated with a packet
2152 bh_lock_sock_nested(sk
);
2154 if (ssp
->smk_out
== smack_net_ambient
||
2155 labeled
== SMACK_UNLABELED_SOCKET
)
2156 netlbl_sock_delattr(sk
);
2159 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2169 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2171 * @sap: the destination address
2173 * Set the correct secattr for the given socket based on the destination
2174 * address and perform any outbound access checks needed.
2176 * Returns 0 on success or an error code.
2179 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2181 struct smack_known
*skp
;
2184 struct smack_known
*hkp
;
2185 struct socket_smack
*ssp
= sk
->sk_security
;
2186 struct smk_audit_info ad
;
2189 hkp
= smack_host_label(sap
);
2192 struct lsm_network_audit net
;
2194 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2195 ad
.a
.u
.net
->family
= sap
->sin_family
;
2196 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2197 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2199 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2201 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2202 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2204 sk_lbl
= SMACK_CIPSO_SOCKET
;
2211 return smack_netlabel(sk
, sk_lbl
);
2215 * smk_ipv6_port_label - Smack port access table management
2219 * Create or update the port list entry
2221 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2223 struct sock
*sk
= sock
->sk
;
2224 struct sockaddr_in6
*addr6
;
2225 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2226 struct smk_port_label
*spp
;
2227 unsigned short port
= 0;
2229 if (address
== NULL
) {
2231 * This operation is changing the Smack information
2232 * on the bound socket. Take the changes to the port
2235 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2236 if (sk
!= spp
->smk_sock
)
2238 spp
->smk_in
= ssp
->smk_in
;
2239 spp
->smk_out
= ssp
->smk_out
;
2243 * A NULL address is only used for updating existing
2244 * bound entries. If there isn't one, it's OK.
2249 addr6
= (struct sockaddr_in6
*)address
;
2250 port
= ntohs(addr6
->sin6_port
);
2252 * This is a special case that is safely ignored.
2258 * Look for an existing port list entry.
2259 * This is an indication that a port is getting reused.
2261 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2262 if (spp
->smk_port
!= port
)
2264 spp
->smk_port
= port
;
2266 spp
->smk_in
= ssp
->smk_in
;
2267 spp
->smk_out
= ssp
->smk_out
;
2272 * A new port entry is required.
2274 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2278 spp
->smk_port
= port
;
2280 spp
->smk_in
= ssp
->smk_in
;
2281 spp
->smk_out
= ssp
->smk_out
;
2283 list_add(&spp
->list
, &smk_ipv6_port_list
);
2288 * smk_ipv6_port_check - check Smack port access
2292 * Create or update the port list entry
2294 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2299 struct smk_port_label
*spp
;
2300 struct socket_smack
*ssp
= sk
->sk_security
;
2301 struct smack_known
*skp
;
2302 unsigned short port
= 0;
2303 struct smack_known
*object
;
2304 struct smk_audit_info ad
;
2307 struct lsm_network_audit net
;
2310 if (act
== SMK_RECEIVING
) {
2311 skp
= smack_net_ambient
;
2312 object
= ssp
->smk_in
;
2315 object
= smack_net_ambient
;
2319 * Get the IP address and port from the address.
2321 port
= ntohs(address
->sin6_port
);
2322 bep
= (__be16
*)(&address
->sin6_addr
);
2323 be32p
= (__be32
*)(&address
->sin6_addr
);
2326 * It's remote, so port lookup does no good.
2328 if (be32p
[0] || be32p
[1] || be32p
[2] || bep
[6] || ntohs(bep
[7]) != 1)
2332 * It's local so the send check has to have passed.
2334 if (act
== SMK_RECEIVING
) {
2335 skp
= &smack_known_web
;
2339 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2340 if (spp
->smk_port
!= port
)
2342 object
= spp
->smk_in
;
2343 if (act
== SMK_CONNECTING
)
2344 ssp
->smk_packet
= spp
->smk_out
;
2351 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2352 ad
.a
.u
.net
->family
= sk
->sk_family
;
2353 ad
.a
.u
.net
->dport
= port
;
2354 if (act
== SMK_RECEIVING
)
2355 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2357 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2359 rc
= smk_access(skp
, object
, MAY_WRITE
, &ad
);
2360 rc
= smk_bu_note("IPv6 port check", skp
, object
, MAY_WRITE
, rc
);
2365 * smack_inode_setsecurity - set smack xattrs
2366 * @inode: the object
2367 * @name: attribute name
2368 * @value: attribute value
2369 * @size: size of the attribute
2372 * Sets the named attribute in the appropriate blob
2374 * Returns 0 on success, or an error code
2376 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2377 const void *value
, size_t size
, int flags
)
2379 struct smack_known
*skp
;
2380 struct inode_smack
*nsp
= inode
->i_security
;
2381 struct socket_smack
*ssp
;
2382 struct socket
*sock
;
2385 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2388 skp
= smk_import_entry(value
, size
);
2392 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2393 nsp
->smk_inode
= skp
;
2394 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2398 * The rest of the Smack xattrs are only on sockets.
2400 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2403 sock
= SOCKET_I(inode
);
2404 if (sock
== NULL
|| sock
->sk
== NULL
)
2407 ssp
= sock
->sk
->sk_security
;
2409 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2411 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2413 if (sock
->sk
->sk_family
== PF_INET
) {
2414 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2417 "Smack: \"%s\" netlbl error %d.\n",
2423 if (sock
->sk
->sk_family
== PF_INET6
)
2424 smk_ipv6_port_label(sock
, NULL
);
2430 * smack_socket_post_create - finish socket setup
2432 * @family: protocol family
2437 * Sets the netlabel information on the socket
2439 * Returns 0 on success, and error code otherwise
2441 static int smack_socket_post_create(struct socket
*sock
, int family
,
2442 int type
, int protocol
, int kern
)
2444 if (family
!= PF_INET
|| sock
->sk
== NULL
)
2447 * Set the outbound netlbl.
2449 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2453 * smack_socket_bind - record port binding information.
2455 * @address: the port address
2456 * @addrlen: size of the address
2458 * Records the label bound to a port.
2462 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2465 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2466 smk_ipv6_port_label(sock
, address
);
2472 * smack_socket_connect - connect access check
2474 * @sap: the other end
2475 * @addrlen: size of sap
2477 * Verifies that a connection may be possible
2479 * Returns 0 on success, and error code otherwise
2481 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2486 if (sock
->sk
== NULL
)
2489 switch (sock
->sk
->sk_family
) {
2491 if (addrlen
< sizeof(struct sockaddr_in
))
2493 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2496 if (addrlen
< sizeof(struct sockaddr_in6
))
2498 rc
= smk_ipv6_port_check(sock
->sk
, (struct sockaddr_in6
*)sap
,
2506 * smack_flags_to_may - convert S_ to MAY_ values
2507 * @flags: the S_ value
2509 * Returns the equivalent MAY_ value
2511 static int smack_flags_to_may(int flags
)
2515 if (flags
& S_IRUGO
)
2517 if (flags
& S_IWUGO
)
2519 if (flags
& S_IXUGO
)
2526 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2531 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2533 struct smack_known
*skp
= smk_of_current();
2535 msg
->security
= skp
;
2540 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2543 * Clears the blob pointer
2545 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2547 msg
->security
= NULL
;
2551 * smack_of_shm - the smack pointer for the shm
2554 * Returns a pointer to the smack value
2556 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2558 return (struct smack_known
*)shp
->shm_perm
.security
;
2562 * smack_shm_alloc_security - Set the security blob for shm
2567 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2569 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2570 struct smack_known
*skp
= smk_of_current();
2572 isp
->security
= skp
;
2577 * smack_shm_free_security - Clear the security blob for shm
2580 * Clears the blob pointer
2582 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2584 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2586 isp
->security
= NULL
;
2590 * smk_curacc_shm : check if current has access on shm
2592 * @access : access requested
2594 * Returns 0 if current has the requested access, error code otherwise
2596 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2598 struct smack_known
*ssp
= smack_of_shm(shp
);
2599 struct smk_audit_info ad
;
2603 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2604 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2606 rc
= smk_curacc(ssp
, access
, &ad
);
2607 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2612 * smack_shm_associate - Smack access check for shm
2614 * @shmflg: access requested
2616 * Returns 0 if current has the requested access, error code otherwise
2618 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2622 may
= smack_flags_to_may(shmflg
);
2623 return smk_curacc_shm(shp
, may
);
2627 * smack_shm_shmctl - Smack access check for shm
2629 * @cmd: what it wants to do
2631 * Returns 0 if current has the requested access, error code otherwise
2633 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2646 may
= MAY_READWRITE
;
2651 * System level information.
2657 return smk_curacc_shm(shp
, may
);
2661 * smack_shm_shmat - Smack access for shmat
2664 * @shmflg: access requested
2666 * Returns 0 if current has the requested access, error code otherwise
2668 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2673 may
= smack_flags_to_may(shmflg
);
2674 return smk_curacc_shm(shp
, may
);
2678 * smack_of_sem - the smack pointer for the sem
2681 * Returns a pointer to the smack value
2683 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
2685 return (struct smack_known
*)sma
->sem_perm
.security
;
2689 * smack_sem_alloc_security - Set the security blob for sem
2694 static int smack_sem_alloc_security(struct sem_array
*sma
)
2696 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2697 struct smack_known
*skp
= smk_of_current();
2699 isp
->security
= skp
;
2704 * smack_sem_free_security - Clear the security blob for sem
2707 * Clears the blob pointer
2709 static void smack_sem_free_security(struct sem_array
*sma
)
2711 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2713 isp
->security
= NULL
;
2717 * smk_curacc_sem : check if current has access on sem
2719 * @access : access requested
2721 * Returns 0 if current has the requested access, error code otherwise
2723 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2725 struct smack_known
*ssp
= smack_of_sem(sma
);
2726 struct smk_audit_info ad
;
2730 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2731 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2733 rc
= smk_curacc(ssp
, access
, &ad
);
2734 rc
= smk_bu_current("sem", ssp
, access
, rc
);
2739 * smack_sem_associate - Smack access check for sem
2741 * @semflg: access requested
2743 * Returns 0 if current has the requested access, error code otherwise
2745 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2749 may
= smack_flags_to_may(semflg
);
2750 return smk_curacc_sem(sma
, may
);
2754 * smack_sem_shmctl - Smack access check for sem
2756 * @cmd: what it wants to do
2758 * Returns 0 if current has the requested access, error code otherwise
2760 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2778 may
= MAY_READWRITE
;
2783 * System level information
2790 return smk_curacc_sem(sma
, may
);
2794 * smack_sem_semop - Smack checks of semaphore operations
2800 * Treated as read and write in all cases.
2802 * Returns 0 if access is allowed, error code otherwise
2804 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2805 unsigned nsops
, int alter
)
2807 return smk_curacc_sem(sma
, MAY_READWRITE
);
2811 * smack_msg_alloc_security - Set the security blob for msg
2816 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2818 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2819 struct smack_known
*skp
= smk_of_current();
2821 kisp
->security
= skp
;
2826 * smack_msg_free_security - Clear the security blob for msg
2829 * Clears the blob pointer
2831 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2833 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2835 kisp
->security
= NULL
;
2839 * smack_of_msq - the smack pointer for the msq
2842 * Returns a pointer to the smack label entry
2844 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
2846 return (struct smack_known
*)msq
->q_perm
.security
;
2850 * smk_curacc_msq : helper to check if current has access on msq
2852 * @access : access requested
2854 * return 0 if current has access, error otherwise
2856 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2858 struct smack_known
*msp
= smack_of_msq(msq
);
2859 struct smk_audit_info ad
;
2863 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2864 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2866 rc
= smk_curacc(msp
, access
, &ad
);
2867 rc
= smk_bu_current("msq", msp
, access
, rc
);
2872 * smack_msg_queue_associate - Smack access check for msg_queue
2874 * @msqflg: access requested
2876 * Returns 0 if current has the requested access, error code otherwise
2878 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2882 may
= smack_flags_to_may(msqflg
);
2883 return smk_curacc_msq(msq
, may
);
2887 * smack_msg_queue_msgctl - Smack access check for msg_queue
2889 * @cmd: what it wants to do
2891 * Returns 0 if current has the requested access, error code otherwise
2893 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2904 may
= MAY_READWRITE
;
2909 * System level information
2916 return smk_curacc_msq(msq
, may
);
2920 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2923 * @msqflg: access requested
2925 * Returns 0 if current has the requested access, error code otherwise
2927 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2932 may
= smack_flags_to_may(msqflg
);
2933 return smk_curacc_msq(msq
, may
);
2937 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2944 * Returns 0 if current has read and write access, error code otherwise
2946 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2947 struct task_struct
*target
, long type
, int mode
)
2949 return smk_curacc_msq(msq
, MAY_READWRITE
);
2953 * smack_ipc_permission - Smack access for ipc_permission()
2954 * @ipp: the object permissions
2955 * @flag: access requested
2957 * Returns 0 if current has read and write access, error code otherwise
2959 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2961 struct smack_known
*iskp
= ipp
->security
;
2962 int may
= smack_flags_to_may(flag
);
2963 struct smk_audit_info ad
;
2967 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2968 ad
.a
.u
.ipc_id
= ipp
->id
;
2970 rc
= smk_curacc(iskp
, may
, &ad
);
2971 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
2976 * smack_ipc_getsecid - Extract smack security id
2977 * @ipp: the object permissions
2978 * @secid: where result will be saved
2980 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2982 struct smack_known
*iskp
= ipp
->security
;
2984 *secid
= iskp
->smk_secid
;
2988 * smack_d_instantiate - Make sure the blob is correct on an inode
2989 * @opt_dentry: dentry where inode will be attached
2990 * @inode: the object
2992 * Set the inode's security blob if it hasn't been done already.
2994 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2996 struct super_block
*sbp
;
2997 struct superblock_smack
*sbsp
;
2998 struct inode_smack
*isp
;
2999 struct smack_known
*skp
;
3000 struct smack_known
*ckp
= smk_of_current();
3001 struct smack_known
*final
;
3002 char trattr
[TRANS_TRUE_SIZE
];
3010 isp
= inode
->i_security
;
3012 mutex_lock(&isp
->smk_lock
);
3014 * If the inode is already instantiated
3015 * take the quick way out
3017 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3021 sbsp
= sbp
->s_security
;
3023 * We're going to use the superblock default label
3024 * if there's no label on the file.
3026 final
= sbsp
->smk_default
;
3029 * If this is the root inode the superblock
3030 * may be in the process of initialization.
3031 * If that is the case use the root value out
3032 * of the superblock.
3034 if (opt_dentry
->d_parent
== opt_dentry
) {
3035 if (sbp
->s_magic
== CGROUP_SUPER_MAGIC
) {
3037 * The cgroup filesystem is never mounted,
3038 * so there's no opportunity to set the mount
3041 sbsp
->smk_root
= &smack_known_star
;
3042 sbsp
->smk_default
= &smack_known_star
;
3044 isp
->smk_inode
= sbsp
->smk_root
;
3045 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3050 * This is pretty hackish.
3051 * Casey says that we shouldn't have to do
3052 * file system specific code, but it does help
3053 * with keeping it simple.
3055 switch (sbp
->s_magic
) {
3059 case CGROUP_SUPER_MAGIC
:
3061 * Casey says that it's a little embarrassing
3062 * that the smack file system doesn't do
3063 * extended attributes.
3065 * Casey says pipes are easy (?)
3067 * Socket access is controlled by the socket
3068 * structures associated with the task involved.
3070 * Cgroupfs is special
3072 final
= &smack_known_star
;
3074 case DEVPTS_SUPER_MAGIC
:
3076 * devpts seems content with the label of the task.
3077 * Programs that change smack have to treat the
3082 case PROC_SUPER_MAGIC
:
3084 * Casey says procfs appears not to care.
3085 * The superblock default suffices.
3090 * Device labels should come from the filesystem,
3091 * but watch out, because they're volitile,
3092 * getting recreated on every reboot.
3094 final
= &smack_known_star
;
3098 * If a smack value has been set we want to use it,
3099 * but since tmpfs isn't giving us the opportunity
3100 * to set mount options simulate setting the
3101 * superblock default.
3105 * This isn't an understood special case.
3106 * Get the value from the xattr.
3110 * UNIX domain sockets use lower level socket data.
3112 if (S_ISSOCK(inode
->i_mode
)) {
3113 final
= &smack_known_star
;
3117 * No xattr support means, alas, no SMACK label.
3118 * Use the aforeapplied default.
3119 * It would be curious if the label of the task
3120 * does not match that assigned.
3122 if (inode
->i_op
->getxattr
== NULL
)
3125 * Get the dentry for xattr.
3127 dp
= dget(opt_dentry
);
3128 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3133 * Transmuting directory
3135 if (S_ISDIR(inode
->i_mode
)) {
3137 * If this is a new directory and the label was
3138 * transmuted when the inode was initialized
3139 * set the transmute attribute on the directory
3140 * and mark the inode.
3142 * If there is a transmute attribute on the
3143 * directory mark the inode.
3145 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3146 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3147 rc
= inode
->i_op
->setxattr(dp
,
3148 XATTR_NAME_SMACKTRANSMUTE
,
3149 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3152 rc
= inode
->i_op
->getxattr(dp
,
3153 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3155 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3156 TRANS_TRUE_SIZE
) != 0)
3160 transflag
= SMK_INODE_TRANSMUTE
;
3163 * Don't let the exec or mmap label be "*" or "@".
3165 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3166 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3168 isp
->smk_task
= skp
;
3169 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3170 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3172 isp
->smk_mmap
= skp
;
3179 isp
->smk_inode
= ckp
;
3181 isp
->smk_inode
= final
;
3183 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3186 mutex_unlock(&isp
->smk_lock
);
3191 * smack_getprocattr - Smack process attribute access
3192 * @p: the object task
3193 * @name: the name of the attribute in /proc/.../attr
3194 * @value: where to put the result
3196 * Places a copy of the task Smack into value
3198 * Returns the length of the smack label or an error code
3200 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3202 struct smack_known
*skp
= smk_of_task(task_security(p
));
3206 if (strcmp(name
, "current") != 0)
3209 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3219 * smack_setprocattr - Smack process attribute setting
3220 * @p: the object task
3221 * @name: the name of the attribute in /proc/.../attr
3222 * @value: the value to set
3223 * @size: the size of the value
3225 * Sets the Smack value of the task. Only setting self
3226 * is permitted and only with privilege
3228 * Returns the length of the smack label or an error code
3230 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3231 void *value
, size_t size
)
3233 struct task_smack
*tsp
;
3235 struct smack_known
*skp
;
3238 * Changing another process' Smack value is too dangerous
3239 * and supports no sane use case.
3244 if (!smack_privileged(CAP_MAC_ADMIN
))
3247 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3250 if (strcmp(name
, "current") != 0)
3253 skp
= smk_import_entry(value
, size
);
3258 * No process is ever allowed the web ("@") label.
3260 if (skp
== &smack_known_web
)
3263 new = prepare_creds();
3267 tsp
= new->security
;
3268 tsp
->smk_task
= skp
;
3275 * smack_unix_stream_connect - Smack access on UDS
3277 * @other: the other sock
3280 * Return 0 if a subject with the smack of sock could access
3281 * an object with the smack of other, otherwise an error code
3283 static int smack_unix_stream_connect(struct sock
*sock
,
3284 struct sock
*other
, struct sock
*newsk
)
3286 struct smack_known
*skp
;
3287 struct smack_known
*okp
;
3288 struct socket_smack
*ssp
= sock
->sk_security
;
3289 struct socket_smack
*osp
= other
->sk_security
;
3290 struct socket_smack
*nsp
= newsk
->sk_security
;
3291 struct smk_audit_info ad
;
3294 struct lsm_network_audit net
;
3297 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3301 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3302 smk_ad_setfield_u_net_sk(&ad
, other
);
3304 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3305 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3307 rc
= smk_access(okp
, skp
, MAY_WRITE
, NULL
);
3308 rc
= smk_bu_note("UDS connect", okp
, skp
,
3314 * Cross reference the peer labels for SO_PEERSEC.
3317 nsp
->smk_packet
= ssp
->smk_out
;
3318 ssp
->smk_packet
= osp
->smk_out
;
3325 * smack_unix_may_send - Smack access on UDS
3327 * @other: the other socket
3329 * Return 0 if a subject with the smack of sock could access
3330 * an object with the smack of other, otherwise an error code
3332 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3334 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3335 struct socket_smack
*osp
= other
->sk
->sk_security
;
3336 struct smk_audit_info ad
;
3340 struct lsm_network_audit net
;
3342 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3343 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3346 if (smack_privileged(CAP_MAC_OVERRIDE
))
3349 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3350 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3355 * smack_socket_sendmsg - Smack check based on destination host
3358 * @size: the size of the message
3360 * Return 0 if the current subject can write to the destination host.
3361 * For IPv4 this is only a question if the destination is a single label host.
3362 * For IPv6 this is a check against the label of the port.
3364 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3367 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3368 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3372 * Perfectly reasonable for this to be NULL
3377 switch (sip
->sin_family
) {
3379 rc
= smack_netlabel_send(sock
->sk
, sip
);
3382 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3389 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3390 * @sap: netlabel secattr
3391 * @ssp: socket security information
3393 * Returns a pointer to a Smack label entry found on the label list.
3395 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3396 struct socket_smack
*ssp
)
3398 struct smack_known
*skp
;
3403 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3405 * Looks like a CIPSO packet.
3406 * If there are flags but no level netlabel isn't
3407 * behaving the way we expect it to.
3409 * Look it up in the label table
3410 * Without guidance regarding the smack value
3411 * for the packet fall back on the network
3415 list_for_each_entry(skp
, &smack_known_list
, list
) {
3416 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3419 * Compare the catsets. Use the netlbl APIs.
3421 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3422 if ((skp
->smk_netlabel
.flags
&
3423 NETLBL_SECATTR_MLS_CAT
) == 0)
3427 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3428 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3430 kcat
= netlbl_catmap_walk(
3431 skp
->smk_netlabel
.attr
.mls
.cat
,
3433 if (acat
< 0 || kcat
< 0)
3446 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3447 return &smack_known_web
;
3448 return &smack_known_star
;
3450 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3452 * Looks like a fallback, which gives us a secid.
3454 skp
= smack_from_secid(sap
->attr
.secid
);
3456 * This has got to be a bug because it is
3457 * impossible to specify a fallback without
3458 * specifying the label, which will ensure
3459 * it has a secid, and the only way to get a
3460 * secid is from a fallback.
3462 BUG_ON(skp
== NULL
);
3466 * Without guidance regarding the smack value
3467 * for the packet fall back on the network
3470 return smack_net_ambient
;
3473 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3477 int proto
= -EINVAL
;
3478 struct ipv6hdr _ipv6h
;
3479 struct ipv6hdr
*ip6
;
3481 struct tcphdr _tcph
, *th
;
3482 struct udphdr _udph
, *uh
;
3483 struct dccp_hdr _dccph
, *dh
;
3487 offset
= skb_network_offset(skb
);
3488 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3491 sip
->sin6_addr
= ip6
->saddr
;
3493 nexthdr
= ip6
->nexthdr
;
3494 offset
+= sizeof(_ipv6h
);
3495 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3502 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3504 sip
->sin6_port
= th
->source
;
3507 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3509 sip
->sin6_port
= uh
->source
;
3512 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3514 sip
->sin6_port
= dh
->dccph_sport
;
3521 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3525 * Returns 0 if the packet should be delivered, an error code otherwise
3527 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3529 struct netlbl_lsm_secattr secattr
;
3530 struct socket_smack
*ssp
= sk
->sk_security
;
3531 struct smack_known
*skp
;
3532 struct sockaddr_in6 sadd
;
3534 struct smk_audit_info ad
;
3536 struct lsm_network_audit net
;
3538 switch (sk
->sk_family
) {
3541 * Translate what netlabel gave us.
3543 netlbl_secattr_init(&secattr
);
3545 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3547 skp
= smack_from_secattr(&secattr
, ssp
);
3549 skp
= smack_net_ambient
;
3551 netlbl_secattr_destroy(&secattr
);
3554 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3555 ad
.a
.u
.net
->family
= sk
->sk_family
;
3556 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3557 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3560 * Receiving a packet requires that the other end
3561 * be able to write here. Read access is not required.
3562 * This is the simplist possible security model
3565 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3566 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3569 netlbl_skbuff_err(skb
, rc
, 0);
3572 rc
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3573 if (rc
== IPPROTO_UDP
|| rc
== IPPROTO_TCP
)
3574 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3583 * smack_socket_getpeersec_stream - pull in packet label
3585 * @optval: user's destination
3586 * @optlen: size thereof
3589 * returns zero on success, an error code otherwise
3591 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3592 char __user
*optval
,
3593 int __user
*optlen
, unsigned len
)
3595 struct socket_smack
*ssp
;
3600 ssp
= sock
->sk
->sk_security
;
3601 if (ssp
->smk_packet
!= NULL
) {
3602 rcp
= ssp
->smk_packet
->smk_known
;
3603 slen
= strlen(rcp
) + 1;
3608 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3611 if (put_user(slen
, optlen
) != 0)
3619 * smack_socket_getpeersec_dgram - pull in packet label
3620 * @sock: the peer socket
3622 * @secid: pointer to where to put the secid of the packet
3624 * Sets the netlabel socket state on sk from parent
3626 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
3627 struct sk_buff
*skb
, u32
*secid
)
3630 struct netlbl_lsm_secattr secattr
;
3631 struct socket_smack
*ssp
= NULL
;
3632 struct smack_known
*skp
;
3633 int family
= PF_UNSPEC
;
3634 u32 s
= 0; /* 0 is the invalid secid */
3638 if (skb
->protocol
== htons(ETH_P_IP
))
3640 else if (skb
->protocol
== htons(ETH_P_IPV6
))
3643 if (family
== PF_UNSPEC
&& sock
!= NULL
)
3644 family
= sock
->sk
->sk_family
;
3646 if (family
== PF_UNIX
) {
3647 ssp
= sock
->sk
->sk_security
;
3648 s
= ssp
->smk_out
->smk_secid
;
3649 } else if (family
== PF_INET
|| family
== PF_INET6
) {
3651 * Translate what netlabel gave us.
3653 if (sock
!= NULL
&& sock
->sk
!= NULL
)
3654 ssp
= sock
->sk
->sk_security
;
3655 netlbl_secattr_init(&secattr
);
3656 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3658 skp
= smack_from_secattr(&secattr
, ssp
);
3661 netlbl_secattr_destroy(&secattr
);
3670 * smack_sock_graft - Initialize a newly created socket with an existing sock
3672 * @parent: parent socket
3674 * Set the smk_{in,out} state of an existing sock based on the process that
3675 * is creating the new socket.
3677 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3679 struct socket_smack
*ssp
;
3680 struct smack_known
*skp
= smk_of_current();
3683 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3686 ssp
= sk
->sk_security
;
3689 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3693 * smack_inet_conn_request - Smack access check on connect
3694 * @sk: socket involved
3698 * Returns 0 if a task with the packet label could write to
3699 * the socket, otherwise an error code
3701 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3702 struct request_sock
*req
)
3704 u16 family
= sk
->sk_family
;
3705 struct smack_known
*skp
;
3706 struct socket_smack
*ssp
= sk
->sk_security
;
3707 struct netlbl_lsm_secattr secattr
;
3708 struct sockaddr_in addr
;
3710 struct smack_known
*hskp
;
3712 struct smk_audit_info ad
;
3714 struct lsm_network_audit net
;
3717 if (family
== PF_INET6
) {
3719 * Handle mapped IPv4 packets arriving
3720 * via IPv6 sockets. Don't set up netlabel
3721 * processing on IPv6.
3723 if (skb
->protocol
== htons(ETH_P_IP
))
3729 netlbl_secattr_init(&secattr
);
3730 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3732 skp
= smack_from_secattr(&secattr
, ssp
);
3734 skp
= &smack_known_huh
;
3735 netlbl_secattr_destroy(&secattr
);
3738 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3739 ad
.a
.u
.net
->family
= family
;
3740 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3741 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3744 * Receiving a packet requires that the other end be able to write
3745 * here. Read access is not required.
3747 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3748 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
3753 * Save the peer's label in the request_sock so we can later setup
3754 * smk_packet in the child socket so that SO_PEERCRED can report it.
3756 req
->peer_secid
= skp
->smk_secid
;
3759 * We need to decide if we want to label the incoming connection here
3760 * if we do we only need to label the request_sock and the stack will
3761 * propagate the wire-label to the sock when it is created.
3764 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3766 hskp
= smack_host_label(&addr
);
3770 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
3772 netlbl_req_delattr(req
);
3778 * smack_inet_csk_clone - Copy the connection information to the new socket
3779 * @sk: the new socket
3780 * @req: the connection's request_sock
3782 * Transfer the connection's peer label to the newly created socket.
3784 static void smack_inet_csk_clone(struct sock
*sk
,
3785 const struct request_sock
*req
)
3787 struct socket_smack
*ssp
= sk
->sk_security
;
3788 struct smack_known
*skp
;
3790 if (req
->peer_secid
!= 0) {
3791 skp
= smack_from_secid(req
->peer_secid
);
3792 ssp
->smk_packet
= skp
;
3794 ssp
->smk_packet
= NULL
;
3798 * Key management security hooks
3800 * Casey has not tested key support very heavily.
3801 * The permission check is most likely too restrictive.
3802 * If you care about keys please have a look.
3807 * smack_key_alloc - Set the key security blob
3809 * @cred: the credentials to use
3812 * No allocation required
3816 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3817 unsigned long flags
)
3819 struct smack_known
*skp
= smk_of_task(cred
->security
);
3821 key
->security
= skp
;
3826 * smack_key_free - Clear the key security blob
3829 * Clear the blob pointer
3831 static void smack_key_free(struct key
*key
)
3833 key
->security
= NULL
;
3837 * smack_key_permission - Smack access on a key
3838 * @key_ref: gets to the object
3839 * @cred: the credentials to use
3842 * Return 0 if the task has read and write to the object,
3843 * an error code otherwise
3845 static int smack_key_permission(key_ref_t key_ref
,
3846 const struct cred
*cred
, unsigned perm
)
3849 struct smk_audit_info ad
;
3850 struct smack_known
*tkp
= smk_of_task(cred
->security
);
3854 keyp
= key_ref_to_ptr(key_ref
);
3858 * If the key hasn't been initialized give it access so that
3861 if (keyp
->security
== NULL
)
3864 * This should not occur
3869 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3870 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3871 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
3873 if (perm
& KEY_NEED_READ
)
3875 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
3876 request
= MAY_WRITE
;
3877 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
3878 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
3881 #endif /* CONFIG_KEYS */
3886 * Audit requires a unique representation of each Smack specific
3887 * rule. This unique representation is used to distinguish the
3888 * object to be audited from remaining kernel objects and also
3889 * works as a glue between the audit hooks.
3891 * Since repository entries are added but never deleted, we'll use
3892 * the smack_known label address related to the given audit rule as
3893 * the needed unique representation. This also better fits the smack
3894 * model where nearly everything is a label.
3899 * smack_audit_rule_init - Initialize a smack audit rule
3900 * @field: audit rule fields given from user-space (audit.h)
3901 * @op: required testing operator (=, !=, >, <, ...)
3902 * @rulestr: smack label to be audited
3903 * @vrule: pointer to save our own audit rule representation
3905 * Prepare to audit cases where (@field @op @rulestr) is true.
3906 * The label to be audited is created if necessay.
3908 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
3910 struct smack_known
*skp
;
3911 char **rule
= (char **)vrule
;
3914 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3917 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
3920 skp
= smk_import_entry(rulestr
, 0);
3922 *rule
= skp
->smk_known
;
3928 * smack_audit_rule_known - Distinguish Smack audit rules
3929 * @krule: rule of interest, in Audit kernel representation format
3931 * This is used to filter Smack rules from remaining Audit ones.
3932 * If it's proved that this rule belongs to us, the
3933 * audit_rule_match hook will be called to do the final judgement.
3935 static int smack_audit_rule_known(struct audit_krule
*krule
)
3937 struct audit_field
*f
;
3940 for (i
= 0; i
< krule
->field_count
; i
++) {
3941 f
= &krule
->fields
[i
];
3943 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
3951 * smack_audit_rule_match - Audit given object ?
3952 * @secid: security id for identifying the object to test
3953 * @field: audit rule flags given from user-space
3954 * @op: required testing operator
3955 * @vrule: smack internal rule presentation
3956 * @actx: audit context associated with the check
3958 * The core Audit hook. It's used to take the decision of
3959 * whether to audit or not to audit a given object.
3961 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
3962 struct audit_context
*actx
)
3964 struct smack_known
*skp
;
3967 if (unlikely(!rule
)) {
3968 WARN_ONCE(1, "Smack: missing rule\n");
3972 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3975 skp
= smack_from_secid(secid
);
3978 * No need to do string comparisons. If a match occurs,
3979 * both pointers will point to the same smack_known
3982 if (op
== Audit_equal
)
3983 return (rule
== skp
->smk_known
);
3984 if (op
== Audit_not_equal
)
3985 return (rule
!= skp
->smk_known
);
3991 * smack_audit_rule_free - free smack rule representation
3992 * @vrule: rule to be freed.
3994 * No memory was allocated.
3996 static void smack_audit_rule_free(void *vrule
)
4001 #endif /* CONFIG_AUDIT */
4004 * smack_ismaclabel - check if xattr @name references a smack MAC label
4005 * @name: Full xattr name to check.
4007 static int smack_ismaclabel(const char *name
)
4009 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4014 * smack_secid_to_secctx - return the smack label for a secid
4015 * @secid: incoming integer
4016 * @secdata: destination
4017 * @seclen: how long it is
4019 * Exists for networking code.
4021 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4023 struct smack_known
*skp
= smack_from_secid(secid
);
4026 *secdata
= skp
->smk_known
;
4027 *seclen
= strlen(skp
->smk_known
);
4032 * smack_secctx_to_secid - return the secid for a smack label
4033 * @secdata: smack label
4034 * @seclen: how long result is
4035 * @secid: outgoing integer
4037 * Exists for audit and networking code.
4039 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4041 struct smack_known
*skp
= smk_find_entry(secdata
);
4044 *secid
= skp
->smk_secid
;
4051 * smack_release_secctx - don't do anything.
4055 * Exists to make sure nothing gets done, and properly
4057 static void smack_release_secctx(char *secdata
, u32 seclen
)
4061 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4063 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4066 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4068 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4071 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4074 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4082 struct security_operations smack_ops
= {
4085 .ptrace_access_check
= smack_ptrace_access_check
,
4086 .ptrace_traceme
= smack_ptrace_traceme
,
4087 .syslog
= smack_syslog
,
4089 .sb_alloc_security
= smack_sb_alloc_security
,
4090 .sb_free_security
= smack_sb_free_security
,
4091 .sb_copy_data
= smack_sb_copy_data
,
4092 .sb_kern_mount
= smack_sb_kern_mount
,
4093 .sb_statfs
= smack_sb_statfs
,
4095 .bprm_set_creds
= smack_bprm_set_creds
,
4096 .bprm_committing_creds
= smack_bprm_committing_creds
,
4097 .bprm_secureexec
= smack_bprm_secureexec
,
4099 .inode_alloc_security
= smack_inode_alloc_security
,
4100 .inode_free_security
= smack_inode_free_security
,
4101 .inode_init_security
= smack_inode_init_security
,
4102 .inode_link
= smack_inode_link
,
4103 .inode_unlink
= smack_inode_unlink
,
4104 .inode_rmdir
= smack_inode_rmdir
,
4105 .inode_rename
= smack_inode_rename
,
4106 .inode_permission
= smack_inode_permission
,
4107 .inode_setattr
= smack_inode_setattr
,
4108 .inode_getattr
= smack_inode_getattr
,
4109 .inode_setxattr
= smack_inode_setxattr
,
4110 .inode_post_setxattr
= smack_inode_post_setxattr
,
4111 .inode_getxattr
= smack_inode_getxattr
,
4112 .inode_removexattr
= smack_inode_removexattr
,
4113 .inode_getsecurity
= smack_inode_getsecurity
,
4114 .inode_setsecurity
= smack_inode_setsecurity
,
4115 .inode_listsecurity
= smack_inode_listsecurity
,
4116 .inode_getsecid
= smack_inode_getsecid
,
4118 .file_permission
= smack_file_permission
,
4119 .file_alloc_security
= smack_file_alloc_security
,
4120 .file_free_security
= smack_file_free_security
,
4121 .file_ioctl
= smack_file_ioctl
,
4122 .file_lock
= smack_file_lock
,
4123 .file_fcntl
= smack_file_fcntl
,
4124 .mmap_file
= smack_mmap_file
,
4125 .mmap_addr
= cap_mmap_addr
,
4126 .file_set_fowner
= smack_file_set_fowner
,
4127 .file_send_sigiotask
= smack_file_send_sigiotask
,
4128 .file_receive
= smack_file_receive
,
4130 .file_open
= smack_file_open
,
4132 .cred_alloc_blank
= smack_cred_alloc_blank
,
4133 .cred_free
= smack_cred_free
,
4134 .cred_prepare
= smack_cred_prepare
,
4135 .cred_transfer
= smack_cred_transfer
,
4136 .kernel_act_as
= smack_kernel_act_as
,
4137 .kernel_create_files_as
= smack_kernel_create_files_as
,
4138 .task_setpgid
= smack_task_setpgid
,
4139 .task_getpgid
= smack_task_getpgid
,
4140 .task_getsid
= smack_task_getsid
,
4141 .task_getsecid
= smack_task_getsecid
,
4142 .task_setnice
= smack_task_setnice
,
4143 .task_setioprio
= smack_task_setioprio
,
4144 .task_getioprio
= smack_task_getioprio
,
4145 .task_setscheduler
= smack_task_setscheduler
,
4146 .task_getscheduler
= smack_task_getscheduler
,
4147 .task_movememory
= smack_task_movememory
,
4148 .task_kill
= smack_task_kill
,
4149 .task_wait
= smack_task_wait
,
4150 .task_to_inode
= smack_task_to_inode
,
4152 .ipc_permission
= smack_ipc_permission
,
4153 .ipc_getsecid
= smack_ipc_getsecid
,
4155 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
4156 .msg_msg_free_security
= smack_msg_msg_free_security
,
4158 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
4159 .msg_queue_free_security
= smack_msg_queue_free_security
,
4160 .msg_queue_associate
= smack_msg_queue_associate
,
4161 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
4162 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
4163 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
4165 .shm_alloc_security
= smack_shm_alloc_security
,
4166 .shm_free_security
= smack_shm_free_security
,
4167 .shm_associate
= smack_shm_associate
,
4168 .shm_shmctl
= smack_shm_shmctl
,
4169 .shm_shmat
= smack_shm_shmat
,
4171 .sem_alloc_security
= smack_sem_alloc_security
,
4172 .sem_free_security
= smack_sem_free_security
,
4173 .sem_associate
= smack_sem_associate
,
4174 .sem_semctl
= smack_sem_semctl
,
4175 .sem_semop
= smack_sem_semop
,
4177 .d_instantiate
= smack_d_instantiate
,
4179 .getprocattr
= smack_getprocattr
,
4180 .setprocattr
= smack_setprocattr
,
4182 .unix_stream_connect
= smack_unix_stream_connect
,
4183 .unix_may_send
= smack_unix_may_send
,
4185 .socket_post_create
= smack_socket_post_create
,
4186 .socket_bind
= smack_socket_bind
,
4187 .socket_connect
= smack_socket_connect
,
4188 .socket_sendmsg
= smack_socket_sendmsg
,
4189 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
4190 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
4191 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
4192 .sk_alloc_security
= smack_sk_alloc_security
,
4193 .sk_free_security
= smack_sk_free_security
,
4194 .sock_graft
= smack_sock_graft
,
4195 .inet_conn_request
= smack_inet_conn_request
,
4196 .inet_csk_clone
= smack_inet_csk_clone
,
4198 /* key management security hooks */
4200 .key_alloc
= smack_key_alloc
,
4201 .key_free
= smack_key_free
,
4202 .key_permission
= smack_key_permission
,
4203 #endif /* CONFIG_KEYS */
4207 .audit_rule_init
= smack_audit_rule_init
,
4208 .audit_rule_known
= smack_audit_rule_known
,
4209 .audit_rule_match
= smack_audit_rule_match
,
4210 .audit_rule_free
= smack_audit_rule_free
,
4211 #endif /* CONFIG_AUDIT */
4213 .ismaclabel
= smack_ismaclabel
,
4214 .secid_to_secctx
= smack_secid_to_secctx
,
4215 .secctx_to_secid
= smack_secctx_to_secid
,
4216 .release_secctx
= smack_release_secctx
,
4217 .inode_notifysecctx
= smack_inode_notifysecctx
,
4218 .inode_setsecctx
= smack_inode_setsecctx
,
4219 .inode_getsecctx
= smack_inode_getsecctx
,
4223 static __init
void init_smack_known_list(void)
4226 * Initialize rule list locks
4228 mutex_init(&smack_known_huh
.smk_rules_lock
);
4229 mutex_init(&smack_known_hat
.smk_rules_lock
);
4230 mutex_init(&smack_known_floor
.smk_rules_lock
);
4231 mutex_init(&smack_known_star
.smk_rules_lock
);
4232 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4233 mutex_init(&smack_known_web
.smk_rules_lock
);
4235 * Initialize rule lists
4237 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4238 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4239 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4240 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4241 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4242 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4244 * Create the known labels list
4246 smk_insert_entry(&smack_known_huh
);
4247 smk_insert_entry(&smack_known_hat
);
4248 smk_insert_entry(&smack_known_star
);
4249 smk_insert_entry(&smack_known_floor
);
4250 smk_insert_entry(&smack_known_invalid
);
4251 smk_insert_entry(&smack_known_web
);
4255 * smack_init - initialize the smack system
4259 static __init
int smack_init(void)
4262 struct task_smack
*tsp
;
4264 if (!security_module_enable(&smack_ops
))
4267 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4272 printk(KERN_INFO
"Smack: Initializing.\n");
4275 * Set the security state for the initial task.
4277 cred
= (struct cred
*) current
->cred
;
4278 cred
->security
= tsp
;
4280 /* initialize the smack_known_list */
4281 init_smack_known_list();
4286 if (register_security(&smack_ops
))
4287 panic("smack: Unable to register with kernel.\n");
4293 * Smack requires early initialization in order to label
4294 * all processes and objects when they are created.
4296 security_initcall(smack_init
);