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
);
56 static struct kmem_cache
*smack_inode_cache
;
58 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
59 static void smk_bu_mode(int mode
, char *s
)
69 if (mode
& MAY_APPEND
)
71 if (mode
& MAY_TRANSMUTE
)
81 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
82 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
83 struct smack_known
*oskp
, int mode
, int rc
)
85 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
90 smk_bu_mode(mode
, acc
);
91 pr_info("Smack Bringup: (%s %s %s) %s\n",
92 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
96 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
100 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
103 struct task_smack
*tsp
= current_security();
104 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
109 smk_bu_mode(mode
, acc
);
110 pr_info("Smack Bringup: (%s %s %s) %s %s\n",
111 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
112 acc
, current
->comm
, note
);
116 #define smk_bu_current(note, oskp, mode, RC) (RC)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
122 struct task_smack
*tsp
= current_security();
123 struct task_smack
*otsp
= task_security(otp
);
124 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
129 smk_bu_mode(mode
, acc
);
130 pr_info("Smack Bringup: (%s %s %s) %s to %s\n",
131 tsp
->smk_task
->smk_known
, otsp
->smk_task
->smk_known
, acc
,
132 current
->comm
, otp
->comm
);
136 #define smk_bu_task(otp, mode, RC) (RC)
139 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
140 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
142 struct task_smack
*tsp
= current_security();
143 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
148 smk_bu_mode(mode
, acc
);
149 pr_info("Smack Bringup: (%s %s %s) inode=(%s %ld) %s\n",
150 tsp
->smk_task
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
151 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
155 #define smk_bu_inode(inode, mode, RC) (RC)
158 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
159 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
161 struct task_smack
*tsp
= current_security();
162 struct smack_known
*sskp
= tsp
->smk_task
;
163 struct inode
*inode
= file
->f_inode
;
164 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
169 smk_bu_mode(mode
, acc
);
170 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
171 sskp
->smk_known
, (char *)file
->f_security
, acc
,
172 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
177 #define smk_bu_file(file, mode, RC) (RC)
180 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
181 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
184 struct task_smack
*tsp
= cred
->security
;
185 struct smack_known
*sskp
= tsp
->smk_task
;
186 struct inode
*inode
= file
->f_inode
;
187 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
192 smk_bu_mode(mode
, acc
);
193 pr_info("Smack Bringup: (%s %s %s) file=(%s %ld %pD) %s\n",
194 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
195 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
200 #define smk_bu_credfile(cred, file, mode, RC) (RC)
204 * smk_fetch - Fetch the smack label from a file.
205 * @ip: a pointer to the inode
206 * @dp: a pointer to the dentry
208 * Returns a pointer to the master list entry for the Smack label
209 * or NULL if there was no label to fetch.
211 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
216 struct smack_known
*skp
= NULL
;
218 if (ip
->i_op
->getxattr
== NULL
)
221 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
225 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
227 skp
= smk_import_entry(buffer
, rc
);
235 * new_inode_smack - allocate an inode security blob
236 * @skp: a pointer to the Smack label entry to use in the blob
238 * Returns the new blob or NULL if there's no memory available
240 struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
242 struct inode_smack
*isp
;
244 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
248 isp
->smk_inode
= skp
;
250 mutex_init(&isp
->smk_lock
);
256 * new_task_smack - allocate a task security blob
257 * @smack: a pointer to the Smack label to use in the blob
259 * Returns the new blob or NULL if there's no memory available
261 static struct task_smack
*new_task_smack(struct smack_known
*task
,
262 struct smack_known
*forked
, gfp_t gfp
)
264 struct task_smack
*tsp
;
266 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
270 tsp
->smk_task
= task
;
271 tsp
->smk_forked
= forked
;
272 INIT_LIST_HEAD(&tsp
->smk_rules
);
273 mutex_init(&tsp
->smk_rules_lock
);
279 * smk_copy_rules - copy a rule set
280 * @nhead - new rules header pointer
281 * @ohead - old rules header pointer
283 * Returns 0 on success, -ENOMEM on error
285 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
288 struct smack_rule
*nrp
;
289 struct smack_rule
*orp
;
292 INIT_LIST_HEAD(nhead
);
294 list_for_each_entry_rcu(orp
, ohead
, list
) {
295 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
301 list_add_rcu(&nrp
->list
, nhead
);
307 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
308 * @mode - input mode in form of PTRACE_MODE_*
310 * Returns a converted MAY_* mode usable by smack rules
312 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
315 case PTRACE_MODE_READ
:
317 case PTRACE_MODE_ATTACH
:
318 return MAY_READWRITE
;
325 * smk_ptrace_rule_check - helper for ptrace access
326 * @tracer: tracer process
327 * @tracee_known: label entry of the process that's about to be traced
328 * @mode: ptrace attachment mode (PTRACE_MODE_*)
329 * @func: name of the function that called us, used for audit
331 * Returns 0 on access granted, -error on error
333 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
334 struct smack_known
*tracee_known
,
335 unsigned int mode
, const char *func
)
338 struct smk_audit_info ad
, *saip
= NULL
;
339 struct task_smack
*tsp
;
340 struct smack_known
*tracer_known
;
342 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
343 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
344 smk_ad_setfield_u_tsk(&ad
, tracer
);
348 tsp
= task_security(tracer
);
349 tracer_known
= smk_of_task(tsp
);
351 if ((mode
& PTRACE_MODE_ATTACH
) &&
352 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
353 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
354 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
356 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
358 else if (capable(CAP_SYS_PTRACE
))
364 smack_log(tracer_known
->smk_known
,
365 tracee_known
->smk_known
,
371 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
372 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
378 * We he, that is fun!
382 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
383 * @ctp: child task pointer
384 * @mode: ptrace attachment mode (PTRACE_MODE_*)
386 * Returns 0 if access is OK, an error code otherwise
388 * Do the capability checks.
390 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
393 struct smack_known
*skp
;
395 rc
= cap_ptrace_access_check(ctp
, mode
);
399 skp
= smk_of_task(task_security(ctp
));
401 rc
= smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
406 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
407 * @ptp: parent task pointer
409 * Returns 0 if access is OK, an error code otherwise
411 * Do the capability checks, and require PTRACE_MODE_ATTACH.
413 static int smack_ptrace_traceme(struct task_struct
*ptp
)
416 struct smack_known
*skp
;
418 rc
= cap_ptrace_traceme(ptp
);
422 skp
= smk_of_task(current_security());
424 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
429 * smack_syslog - Smack approval on syslog
430 * @type: message type
432 * Returns 0 on success, error code otherwise.
434 static int smack_syslog(int typefrom_file
)
437 struct smack_known
*skp
= smk_of_current();
439 if (smack_privileged(CAP_MAC_OVERRIDE
))
442 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
454 * smack_sb_alloc_security - allocate a superblock blob
455 * @sb: the superblock getting the blob
457 * Returns 0 on success or -ENOMEM on error.
459 static int smack_sb_alloc_security(struct super_block
*sb
)
461 struct superblock_smack
*sbsp
;
463 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
468 sbsp
->smk_root
= &smack_known_floor
;
469 sbsp
->smk_default
= &smack_known_floor
;
470 sbsp
->smk_floor
= &smack_known_floor
;
471 sbsp
->smk_hat
= &smack_known_hat
;
473 * smk_initialized will be zero from kzalloc.
475 sb
->s_security
= sbsp
;
481 * smack_sb_free_security - free a superblock blob
482 * @sb: the superblock getting the blob
485 static void smack_sb_free_security(struct super_block
*sb
)
487 kfree(sb
->s_security
);
488 sb
->s_security
= NULL
;
492 * smack_sb_copy_data - copy mount options data for processing
493 * @orig: where to start
494 * @smackopts: mount options string
496 * Returns 0 on success or -ENOMEM on error.
498 * Copy the Smack specific mount options out of the mount
501 static int smack_sb_copy_data(char *orig
, char *smackopts
)
503 char *cp
, *commap
, *otheropts
, *dp
;
505 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
506 if (otheropts
== NULL
)
509 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
510 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
512 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
514 else if (strstr(cp
, SMK_FSHAT
) == cp
)
516 else if (strstr(cp
, SMK_FSROOT
) == cp
)
518 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
523 commap
= strchr(cp
, ',');
532 strcpy(orig
, otheropts
);
533 free_page((unsigned long)otheropts
);
539 * smack_sb_kern_mount - Smack specific mount processing
540 * @sb: the file system superblock
541 * @flags: the mount flags
542 * @data: the smack mount options
544 * Returns 0 on success, an error code on failure
546 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
548 struct dentry
*root
= sb
->s_root
;
549 struct inode
*inode
= root
->d_inode
;
550 struct superblock_smack
*sp
= sb
->s_security
;
551 struct inode_smack
*isp
;
552 struct smack_known
*skp
;
558 if (sp
->smk_initialized
)
561 sp
->smk_initialized
= 1;
563 for (op
= data
; op
!= NULL
; op
= commap
) {
564 commap
= strchr(op
, ',');
568 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
569 op
+= strlen(SMK_FSHAT
);
570 skp
= smk_import_entry(op
, 0);
575 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
576 op
+= strlen(SMK_FSFLOOR
);
577 skp
= smk_import_entry(op
, 0);
582 } else if (strncmp(op
, SMK_FSDEFAULT
,
583 strlen(SMK_FSDEFAULT
)) == 0) {
584 op
+= strlen(SMK_FSDEFAULT
);
585 skp
= smk_import_entry(op
, 0);
587 sp
->smk_default
= skp
;
590 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
591 op
+= strlen(SMK_FSROOT
);
592 skp
= smk_import_entry(op
, 0);
597 } else if (strncmp(op
, SMK_FSTRANS
, strlen(SMK_FSTRANS
)) == 0) {
598 op
+= strlen(SMK_FSTRANS
);
599 skp
= smk_import_entry(op
, 0);
608 if (!smack_privileged(CAP_MAC_ADMIN
)) {
610 * Unprivileged mounts don't get to specify Smack values.
615 * Unprivileged mounts get root and default from the caller.
617 skp
= smk_of_current();
619 sp
->smk_default
= skp
;
622 * Initialize the root inode.
624 isp
= inode
->i_security
;
626 isp
= new_inode_smack(sp
->smk_root
);
629 inode
->i_security
= isp
;
631 isp
->smk_inode
= sp
->smk_root
;
634 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
640 * smack_sb_statfs - Smack check on statfs
641 * @dentry: identifies the file system in question
643 * Returns 0 if current can read the floor of the filesystem,
644 * and error code otherwise
646 static int smack_sb_statfs(struct dentry
*dentry
)
648 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
650 struct smk_audit_info ad
;
652 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
653 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
655 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
656 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
665 * smack_bprm_set_creds - set creds for exec
666 * @bprm: the exec information
668 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
670 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
672 struct inode
*inode
= file_inode(bprm
->file
);
673 struct task_smack
*bsp
= bprm
->cred
->security
;
674 struct inode_smack
*isp
;
677 rc
= cap_bprm_set_creds(bprm
);
681 if (bprm
->cred_prepared
)
684 isp
= inode
->i_security
;
685 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
688 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
689 struct task_struct
*tracer
;
693 tracer
= ptrace_parent(current
);
694 if (likely(tracer
!= NULL
))
695 rc
= smk_ptrace_rule_check(tracer
,
703 } else if (bprm
->unsafe
)
706 bsp
->smk_task
= isp
->smk_task
;
707 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
713 * smack_bprm_committing_creds - Prepare to install the new credentials
716 * @bprm: binprm for exec
718 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
720 struct task_smack
*bsp
= bprm
->cred
->security
;
722 if (bsp
->smk_task
!= bsp
->smk_forked
)
723 current
->pdeath_signal
= 0;
727 * smack_bprm_secureexec - Return the decision to use secureexec.
728 * @bprm: binprm for exec
730 * Returns 0 on success.
732 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
734 struct task_smack
*tsp
= current_security();
735 int ret
= cap_bprm_secureexec(bprm
);
737 if (!ret
&& (tsp
->smk_task
!= tsp
->smk_forked
))
748 * smack_inode_alloc_security - allocate an inode blob
749 * @inode: the inode in need of a blob
751 * Returns 0 if it gets a blob, -ENOMEM otherwise
753 static int smack_inode_alloc_security(struct inode
*inode
)
755 struct smack_known
*skp
= smk_of_current();
757 inode
->i_security
= new_inode_smack(skp
);
758 if (inode
->i_security
== NULL
)
764 * smack_inode_free_security - free an inode blob
765 * @inode: the inode with a blob
767 * Clears the blob pointer in inode
769 static void smack_inode_free_security(struct inode
*inode
)
771 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
772 inode
->i_security
= NULL
;
776 * smack_inode_init_security - copy out the smack from an inode
777 * @inode: the newly created inode
778 * @dir: containing directory object
780 * @name: where to put the attribute name
781 * @value: where to put the attribute value
782 * @len: where to put the length of the attribute
784 * Returns 0 if it all works out, -ENOMEM if there's no memory
786 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
787 const struct qstr
*qstr
, const char **name
,
788 void **value
, size_t *len
)
790 struct inode_smack
*issp
= inode
->i_security
;
791 struct smack_known
*skp
= smk_of_current();
792 struct smack_known
*isp
= smk_of_inode(inode
);
793 struct smack_known
*dsp
= smk_of_inode(dir
);
797 *name
= XATTR_SMACK_SUFFIX
;
801 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
806 * If the access rule allows transmutation and
807 * the directory requests transmutation then
808 * by all means transmute.
809 * Mark the inode as changed.
811 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
812 smk_inode_transmutable(dir
)) {
814 issp
->smk_flags
|= SMK_INODE_CHANGED
;
817 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
823 *len
= strlen(isp
->smk_known
);
829 * smack_inode_link - Smack check on link
830 * @old_dentry: the existing object
832 * @new_dentry: the new object
834 * Returns 0 if access is permitted, an error code otherwise
836 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
837 struct dentry
*new_dentry
)
839 struct smack_known
*isp
;
840 struct smk_audit_info ad
;
843 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
844 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
846 isp
= smk_of_inode(old_dentry
->d_inode
);
847 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
848 rc
= smk_bu_inode(old_dentry
->d_inode
, MAY_WRITE
, rc
);
850 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
851 isp
= smk_of_inode(new_dentry
->d_inode
);
852 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
853 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
854 rc
= smk_bu_inode(new_dentry
->d_inode
, MAY_WRITE
, rc
);
861 * smack_inode_unlink - Smack check on inode deletion
862 * @dir: containing directory object
863 * @dentry: file to unlink
865 * Returns 0 if current can write the containing directory
866 * and the object, error code otherwise
868 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
870 struct inode
*ip
= dentry
->d_inode
;
871 struct smk_audit_info ad
;
874 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
875 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
878 * You need write access to the thing you're unlinking
880 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
881 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
884 * You also need write access to the containing directory
886 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
887 smk_ad_setfield_u_fs_inode(&ad
, dir
);
888 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
889 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
895 * smack_inode_rmdir - Smack check on directory deletion
896 * @dir: containing directory object
897 * @dentry: directory to unlink
899 * Returns 0 if current can write the containing directory
900 * and the directory, error code otherwise
902 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
904 struct smk_audit_info ad
;
907 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
908 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
911 * You need write access to the thing you're removing
913 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
914 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
917 * You also need write access to the containing directory
919 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
920 smk_ad_setfield_u_fs_inode(&ad
, dir
);
921 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
922 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
929 * smack_inode_rename - Smack check on rename
931 * @old_dentry: the old object
933 * @new_dentry: the new object
935 * Read and write access is required on both the old and
938 * Returns 0 if access is permitted, an error code otherwise
940 static int smack_inode_rename(struct inode
*old_inode
,
941 struct dentry
*old_dentry
,
942 struct inode
*new_inode
,
943 struct dentry
*new_dentry
)
946 struct smack_known
*isp
;
947 struct smk_audit_info ad
;
949 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
950 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
952 isp
= smk_of_inode(old_dentry
->d_inode
);
953 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
954 rc
= smk_bu_inode(old_dentry
->d_inode
, MAY_READWRITE
, rc
);
956 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
957 isp
= smk_of_inode(new_dentry
->d_inode
);
958 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
959 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
960 rc
= smk_bu_inode(new_dentry
->d_inode
, MAY_READWRITE
, rc
);
966 * smack_inode_permission - Smack version of permission()
967 * @inode: the inode in question
968 * @mask: the access requested
970 * This is the important Smack hook.
972 * Returns 0 if access is permitted, -EACCES otherwise
974 static int smack_inode_permission(struct inode
*inode
, int mask
)
976 struct smk_audit_info ad
;
977 int no_block
= mask
& MAY_NOT_BLOCK
;
980 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
982 * No permission to check. Existence test. Yup, it's there.
987 /* May be droppable after audit */
990 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
991 smk_ad_setfield_u_fs_inode(&ad
, inode
);
992 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
993 rc
= smk_bu_inode(inode
, mask
, rc
);
998 * smack_inode_setattr - Smack check for setting attributes
999 * @dentry: the object
1000 * @iattr: for the force flag
1002 * Returns 0 if access is permitted, an error code otherwise
1004 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1006 struct smk_audit_info ad
;
1010 * Need to allow for clearing the setuid bit.
1012 if (iattr
->ia_valid
& ATTR_FORCE
)
1014 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1015 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1017 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1018 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1023 * smack_inode_getattr - Smack check for getting attributes
1024 * @mnt: vfsmount of the object
1025 * @dentry: the object
1027 * Returns 0 if access is permitted, an error code otherwise
1029 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
1031 struct smk_audit_info ad
;
1035 path
.dentry
= dentry
;
1038 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1039 smk_ad_setfield_u_fs_path(&ad
, path
);
1040 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
1041 rc
= smk_bu_inode(dentry
->d_inode
, MAY_READ
, rc
);
1046 * smack_inode_setxattr - Smack check for setting xattrs
1047 * @dentry: the object
1048 * @name: name of the attribute
1049 * @value: value of the attribute
1050 * @size: size of the value
1053 * This protects the Smack attribute explicitly.
1055 * Returns 0 if access is permitted, an error code otherwise
1057 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1058 const void *value
, size_t size
, int flags
)
1060 struct smk_audit_info ad
;
1061 struct smack_known
*skp
;
1063 int check_import
= 0;
1068 * Check label validity here so import won't fail in post_setxattr
1070 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1071 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1072 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1075 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1076 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1080 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1082 if (size
!= TRANS_TRUE_SIZE
||
1083 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1086 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1088 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1091 if (rc
== 0 && check_import
) {
1092 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1093 if (skp
== NULL
|| (check_star
&&
1094 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1098 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1099 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1102 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1103 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1110 * smack_inode_post_setxattr - Apply the Smack update approved above
1112 * @name: attribute name
1113 * @value: attribute value
1114 * @size: attribute size
1117 * Set the pointer in the inode blob to the entry found
1118 * in the master label list.
1120 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1121 const void *value
, size_t size
, int flags
)
1123 struct smack_known
*skp
;
1124 struct inode_smack
*isp
= dentry
->d_inode
->i_security
;
1126 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1127 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1131 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1132 skp
= smk_import_entry(value
, size
);
1134 isp
->smk_inode
= skp
;
1136 isp
->smk_inode
= &smack_known_invalid
;
1137 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1138 skp
= smk_import_entry(value
, size
);
1140 isp
->smk_task
= skp
;
1142 isp
->smk_task
= &smack_known_invalid
;
1143 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1144 skp
= smk_import_entry(value
, size
);
1146 isp
->smk_mmap
= skp
;
1148 isp
->smk_mmap
= &smack_known_invalid
;
1155 * smack_inode_getxattr - Smack check on getxattr
1156 * @dentry: the object
1159 * Returns 0 if access is permitted, an error code otherwise
1161 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1163 struct smk_audit_info ad
;
1166 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1167 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1169 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
, &ad
);
1170 rc
= smk_bu_inode(dentry
->d_inode
, MAY_READ
, rc
);
1175 * smack_inode_removexattr - Smack check on removexattr
1176 * @dentry: the object
1177 * @name: name of the attribute
1179 * Removing the Smack attribute requires CAP_MAC_ADMIN
1181 * Returns 0 if access is permitted, an error code otherwise
1183 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1185 struct inode_smack
*isp
;
1186 struct smk_audit_info ad
;
1189 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1190 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1191 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1192 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1193 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1194 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1195 if (!smack_privileged(CAP_MAC_ADMIN
))
1198 rc
= cap_inode_removexattr(dentry
, name
);
1203 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1204 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1206 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
, &ad
);
1207 rc
= smk_bu_inode(dentry
->d_inode
, MAY_WRITE
, rc
);
1211 isp
= dentry
->d_inode
->i_security
;
1213 * Don't do anything special for these.
1214 * XATTR_NAME_SMACKIPIN
1215 * XATTR_NAME_SMACKIPOUT
1216 * XATTR_NAME_SMACKEXEC
1218 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1219 isp
->smk_task
= NULL
;
1220 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1221 isp
->smk_mmap
= NULL
;
1222 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1223 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1229 * smack_inode_getsecurity - get smack xattrs
1230 * @inode: the object
1231 * @name: attribute name
1232 * @buffer: where to put the result
1235 * Returns the size of the attribute or an error code
1237 static int smack_inode_getsecurity(const struct inode
*inode
,
1238 const char *name
, void **buffer
,
1241 struct socket_smack
*ssp
;
1242 struct socket
*sock
;
1243 struct super_block
*sbp
;
1244 struct inode
*ip
= (struct inode
*)inode
;
1245 struct smack_known
*isp
;
1249 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1250 isp
= smk_of_inode(inode
);
1251 ilen
= strlen(isp
->smk_known
);
1252 *buffer
= isp
->smk_known
;
1257 * The rest of the Smack xattrs are only on sockets.
1260 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1263 sock
= SOCKET_I(ip
);
1264 if (sock
== NULL
|| sock
->sk
== NULL
)
1267 ssp
= sock
->sk
->sk_security
;
1269 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1271 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1276 ilen
= strlen(isp
->smk_known
);
1278 *buffer
= isp
->smk_known
;
1287 * smack_inode_listsecurity - list the Smack attributes
1288 * @inode: the object
1289 * @buffer: where they go
1290 * @buffer_size: size of buffer
1292 * Returns 0 on success, -EINVAL otherwise
1294 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1297 int len
= sizeof(XATTR_NAME_SMACK
);
1299 if (buffer
!= NULL
&& len
<= buffer_size
)
1300 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1306 * smack_inode_getsecid - Extract inode's security id
1307 * @inode: inode to extract the info from
1308 * @secid: where result will be saved
1310 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1312 struct inode_smack
*isp
= inode
->i_security
;
1314 *secid
= isp
->smk_inode
->smk_secid
;
1322 * smack_file_permission - Smack check on file operations
1328 * Should access checks be done on each read or write?
1329 * UNICOS and SELinux say yes.
1330 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1332 * I'll say no for now. Smack does not do the frequent
1333 * label changing that SELinux does.
1335 static int smack_file_permission(struct file
*file
, int mask
)
1341 * smack_file_alloc_security - assign a file security blob
1344 * The security blob for a file is a pointer to the master
1345 * label list, so no allocation is done.
1349 static int smack_file_alloc_security(struct file
*file
)
1351 struct smack_known
*skp
= smk_of_current();
1353 file
->f_security
= skp
;
1358 * smack_file_free_security - clear a file security blob
1361 * The security blob for a file is a pointer to the master
1362 * label list, so no memory is freed.
1364 static void smack_file_free_security(struct file
*file
)
1366 file
->f_security
= NULL
;
1370 * smack_file_ioctl - Smack check on ioctls
1375 * Relies heavily on the correct use of the ioctl command conventions.
1377 * Returns 0 if allowed, error code otherwise
1379 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1383 struct smk_audit_info ad
;
1385 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1386 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1388 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1389 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1390 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1393 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1394 rc
= smk_curacc(file
->f_security
, MAY_READ
, &ad
);
1395 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1402 * smack_file_lock - Smack check on file locking
1406 * Returns 0 if current has lock access, error code otherwise
1408 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1410 struct smk_audit_info ad
;
1413 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1414 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1415 rc
= smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1416 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1421 * smack_file_fcntl - Smack check on fcntl
1423 * @cmd: what action to check
1426 * Generally these operations are harmless.
1427 * File locking operations present an obvious mechanism
1428 * for passing information, so they require write access.
1430 * Returns 0 if current has access, error code otherwise
1432 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1435 struct smk_audit_info ad
;
1444 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1445 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1446 rc
= smk_curacc(file
->f_security
, MAY_LOCK
, &ad
);
1447 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1451 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1452 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1453 rc
= smk_curacc(file
->f_security
, MAY_WRITE
, &ad
);
1454 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1465 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1466 * if mapping anonymous memory.
1467 * @file contains the file structure for file to map (may be NULL).
1468 * @reqprot contains the protection requested by the application.
1469 * @prot contains the protection that will be applied by the kernel.
1470 * @flags contains the operational flags.
1471 * Return 0 if permission is granted.
1473 static int smack_mmap_file(struct file
*file
,
1474 unsigned long reqprot
, unsigned long prot
,
1475 unsigned long flags
)
1477 struct smack_known
*skp
;
1478 struct smack_known
*mkp
;
1479 struct smack_rule
*srp
;
1480 struct task_smack
*tsp
;
1481 struct smack_known
*okp
;
1482 struct inode_smack
*isp
;
1491 isp
= file_inode(file
)->i_security
;
1492 if (isp
->smk_mmap
== NULL
)
1494 mkp
= isp
->smk_mmap
;
1496 tsp
= current_security();
1497 skp
= smk_of_current();
1502 * For each Smack rule associated with the subject
1503 * label verify that the SMACK64MMAP also has access
1504 * to that rule's object label.
1506 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1507 okp
= srp
->smk_object
;
1509 * Matching labels always allows access.
1511 if (mkp
->smk_known
== okp
->smk_known
)
1514 * If there is a matching local rule take
1515 * that into account as well.
1517 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1521 may
= srp
->smk_access
;
1523 may
&= srp
->smk_access
;
1525 * If may is zero the SMACK64MMAP subject can't
1526 * possibly have less access.
1532 * Fetch the global list entry.
1533 * If there isn't one a SMACK64MMAP subject
1534 * can't have as much access as current.
1536 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1538 if (mmay
== -ENOENT
) {
1543 * If there is a local entry it modifies the
1544 * potential access, too.
1546 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1548 if (tmay
!= -ENOENT
)
1552 * If there is any access available to current that is
1553 * not available to a SMACK64MMAP subject
1556 if ((may
| mmay
) != mmay
) {
1568 * smack_file_set_fowner - set the file security blob value
1569 * @file: object in question
1572 * Further research may be required on this one.
1574 static void smack_file_set_fowner(struct file
*file
)
1576 struct smack_known
*skp
= smk_of_current();
1578 file
->f_security
= skp
;
1582 * smack_file_send_sigiotask - Smack on sigio
1583 * @tsk: The target task
1584 * @fown: the object the signal come from
1587 * Allow a privileged task to get signals even if it shouldn't
1589 * Returns 0 if a subject with the object's smack could
1590 * write to the task, an error code otherwise.
1592 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1593 struct fown_struct
*fown
, int signum
)
1595 struct smack_known
*skp
;
1596 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1599 struct smk_audit_info ad
;
1602 * struct fown_struct is never outside the context of a struct file
1604 file
= container_of(fown
, struct file
, f_owner
);
1606 /* we don't log here as rc can be overriden */
1607 skp
= file
->f_security
;
1608 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1609 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1610 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1613 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1614 smk_ad_setfield_u_tsk(&ad
, tsk
);
1615 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1620 * smack_file_receive - Smack file receive check
1623 * Returns 0 if current has access, error code otherwise
1625 static int smack_file_receive(struct file
*file
)
1629 struct smk_audit_info ad
;
1631 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1632 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1634 * This code relies on bitmasks.
1636 if (file
->f_mode
& FMODE_READ
)
1638 if (file
->f_mode
& FMODE_WRITE
)
1641 rc
= smk_curacc(file
->f_security
, may
, &ad
);
1642 rc
= smk_bu_file(file
, may
, rc
);
1647 * smack_file_open - Smack dentry open processing
1649 * @cred: task credential
1651 * Set the security blob in the file structure.
1652 * Allow the open only if the task has read access. There are
1653 * many read operations (e.g. fstat) that you can do with an
1654 * fd even if you have the file open write-only.
1658 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1660 struct task_smack
*tsp
= cred
->security
;
1661 struct inode_smack
*isp
= file_inode(file
)->i_security
;
1662 struct smk_audit_info ad
;
1665 if (smack_privileged(CAP_MAC_OVERRIDE
)) {
1666 file
->f_security
= isp
->smk_inode
;
1670 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1671 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1672 rc
= smk_access(tsp
->smk_task
, isp
->smk_inode
, MAY_READ
, &ad
);
1673 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1675 file
->f_security
= isp
->smk_inode
;
1685 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1686 * @new: the new credentials
1687 * @gfp: the atomicity of any memory allocations
1689 * Prepare a blank set of credentials for modification. This must allocate all
1690 * the memory the LSM module might require such that cred_transfer() can
1691 * complete without error.
1693 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1695 struct task_smack
*tsp
;
1697 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1701 cred
->security
= tsp
;
1708 * smack_cred_free - "free" task-level security credentials
1709 * @cred: the credentials in question
1712 static void smack_cred_free(struct cred
*cred
)
1714 struct task_smack
*tsp
= cred
->security
;
1715 struct smack_rule
*rp
;
1716 struct list_head
*l
;
1717 struct list_head
*n
;
1721 cred
->security
= NULL
;
1723 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1724 rp
= list_entry(l
, struct smack_rule
, list
);
1725 list_del(&rp
->list
);
1732 * smack_cred_prepare - prepare new set of credentials for modification
1733 * @new: the new credentials
1734 * @old: the original credentials
1735 * @gfp: the atomicity of any memory allocations
1737 * Prepare a new set of credentials for modification.
1739 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1742 struct task_smack
*old_tsp
= old
->security
;
1743 struct task_smack
*new_tsp
;
1746 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1747 if (new_tsp
== NULL
)
1750 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1754 new->security
= new_tsp
;
1759 * smack_cred_transfer - Transfer the old credentials to the new credentials
1760 * @new: the new credentials
1761 * @old: the original credentials
1763 * Fill in a set of blank credentials from another set of credentials.
1765 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1767 struct task_smack
*old_tsp
= old
->security
;
1768 struct task_smack
*new_tsp
= new->security
;
1770 new_tsp
->smk_task
= old_tsp
->smk_task
;
1771 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1772 mutex_init(&new_tsp
->smk_rules_lock
);
1773 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1776 /* cbs copy rule list */
1780 * smack_kernel_act_as - Set the subjective context in a set of credentials
1781 * @new: points to the set of credentials to be modified.
1782 * @secid: specifies the security ID to be set
1784 * Set the security data for a kernel service.
1786 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1788 struct task_smack
*new_tsp
= new->security
;
1789 struct smack_known
*skp
= smack_from_secid(secid
);
1794 new_tsp
->smk_task
= skp
;
1799 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1800 * @new: points to the set of credentials to be modified
1801 * @inode: points to the inode to use as a reference
1803 * Set the file creation context in a set of credentials to the same
1804 * as the objective context of the specified inode
1806 static int smack_kernel_create_files_as(struct cred
*new,
1807 struct inode
*inode
)
1809 struct inode_smack
*isp
= inode
->i_security
;
1810 struct task_smack
*tsp
= new->security
;
1812 tsp
->smk_forked
= isp
->smk_inode
;
1813 tsp
->smk_task
= tsp
->smk_forked
;
1818 * smk_curacc_on_task - helper to log task related access
1819 * @p: the task object
1820 * @access: the access requested
1821 * @caller: name of the calling function for audit
1823 * Return 0 if access is permitted
1825 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
1828 struct smk_audit_info ad
;
1829 struct smack_known
*skp
= smk_of_task(task_security(p
));
1832 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
1833 smk_ad_setfield_u_tsk(&ad
, p
);
1834 rc
= smk_curacc(skp
, access
, &ad
);
1835 rc
= smk_bu_task(p
, access
, rc
);
1840 * smack_task_setpgid - Smack check on setting pgid
1841 * @p: the task object
1844 * Return 0 if write access is permitted
1846 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1848 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1852 * smack_task_getpgid - Smack access check for getpgid
1853 * @p: the object task
1855 * Returns 0 if current can read the object task, error code otherwise
1857 static int smack_task_getpgid(struct task_struct
*p
)
1859 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1863 * smack_task_getsid - Smack access check for getsid
1864 * @p: the object task
1866 * Returns 0 if current can read the object task, error code otherwise
1868 static int smack_task_getsid(struct task_struct
*p
)
1870 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1874 * smack_task_getsecid - get the secid of the task
1875 * @p: the object task
1876 * @secid: where to put the result
1878 * Sets the secid to contain a u32 version of the smack label.
1880 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1882 struct smack_known
*skp
= smk_of_task(task_security(p
));
1884 *secid
= skp
->smk_secid
;
1888 * smack_task_setnice - Smack check on setting nice
1889 * @p: the task object
1892 * Return 0 if write access is permitted
1894 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1898 rc
= cap_task_setnice(p
, nice
);
1900 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1905 * smack_task_setioprio - Smack check on setting ioprio
1906 * @p: the task object
1909 * Return 0 if write access is permitted
1911 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1915 rc
= cap_task_setioprio(p
, ioprio
);
1917 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1922 * smack_task_getioprio - Smack check on reading ioprio
1923 * @p: the task object
1925 * Return 0 if read access is permitted
1927 static int smack_task_getioprio(struct task_struct
*p
)
1929 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1933 * smack_task_setscheduler - Smack check on setting scheduler
1934 * @p: the task object
1938 * Return 0 if read access is permitted
1940 static int smack_task_setscheduler(struct task_struct
*p
)
1944 rc
= cap_task_setscheduler(p
);
1946 rc
= smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1951 * smack_task_getscheduler - Smack check on reading scheduler
1952 * @p: the task object
1954 * Return 0 if read access is permitted
1956 static int smack_task_getscheduler(struct task_struct
*p
)
1958 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
1962 * smack_task_movememory - Smack check on moving memory
1963 * @p: the task object
1965 * Return 0 if write access is permitted
1967 static int smack_task_movememory(struct task_struct
*p
)
1969 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
1973 * smack_task_kill - Smack check on signal delivery
1974 * @p: the task object
1977 * @secid: identifies the smack to use in lieu of current's
1979 * Return 0 if write access is permitted
1981 * The secid behavior is an artifact of an SELinux hack
1982 * in the USB code. Someday it may go away.
1984 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1987 struct smk_audit_info ad
;
1988 struct smack_known
*skp
;
1989 struct smack_known
*tkp
= smk_of_task(task_security(p
));
1992 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1993 smk_ad_setfield_u_tsk(&ad
, p
);
1995 * Sending a signal requires that the sender
1996 * can write the receiver.
1999 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
2000 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2004 * If the secid isn't 0 we're dealing with some USB IO
2005 * specific behavior. This is not clean. For one thing
2006 * we can't take privilege into account.
2008 skp
= smack_from_secid(secid
);
2009 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2010 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2015 * smack_task_wait - Smack access check for waiting
2016 * @p: task to wait for
2020 static int smack_task_wait(struct task_struct
*p
)
2023 * Allow the operation to succeed.
2025 * In userless environments (e.g. phones) programs
2026 * get marked with SMACK64EXEC and even if the parent
2027 * and child shouldn't be talking the parent still
2028 * may expect to know when the child exits.
2034 * smack_task_to_inode - copy task smack into the inode blob
2035 * @p: task to copy from
2036 * @inode: inode to copy to
2038 * Sets the smack pointer in the inode security blob
2040 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2042 struct inode_smack
*isp
= inode
->i_security
;
2043 struct smack_known
*skp
= smk_of_task(task_security(p
));
2045 isp
->smk_inode
= skp
;
2053 * smack_sk_alloc_security - Allocate a socket blob
2056 * @gfp_flags: memory allocation flags
2058 * Assign Smack pointers to current
2060 * Returns 0 on success, -ENOMEM is there's no memory
2062 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2064 struct smack_known
*skp
= smk_of_current();
2065 struct socket_smack
*ssp
;
2067 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2073 ssp
->smk_packet
= NULL
;
2075 sk
->sk_security
= ssp
;
2081 * smack_sk_free_security - Free a socket blob
2084 * Clears the blob pointer
2086 static void smack_sk_free_security(struct sock
*sk
)
2088 kfree(sk
->sk_security
);
2092 * smack_host_label - check host based restrictions
2093 * @sip: the object end
2095 * looks for host based access restrictions
2097 * This version will only be appropriate for really small sets of single label
2098 * hosts. The caller is responsible for ensuring that the RCU read lock is
2099 * taken before calling this function.
2101 * Returns the label of the far end or NULL if it's not special.
2103 static struct smack_known
*smack_host_label(struct sockaddr_in
*sip
)
2105 struct smk_netlbladdr
*snp
;
2106 struct in_addr
*siap
= &sip
->sin_addr
;
2108 if (siap
->s_addr
== 0)
2111 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
)
2113 * we break after finding the first match because
2114 * the list is sorted from longest to shortest mask
2115 * so we have found the most specific match
2117 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
2118 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
2119 /* we have found the special CIPSO option */
2120 if (snp
->smk_label
== &smack_cipso_option
)
2122 return snp
->smk_label
;
2129 * smack_netlabel - Set the secattr on a socket
2131 * @labeled: socket label scheme
2133 * Convert the outbound smack value (smk_out) to a
2134 * secattr and attach it to the socket.
2136 * Returns 0 on success or an error code
2138 static int smack_netlabel(struct sock
*sk
, int labeled
)
2140 struct smack_known
*skp
;
2141 struct socket_smack
*ssp
= sk
->sk_security
;
2145 * Usually the netlabel code will handle changing the
2146 * packet labeling based on the label.
2147 * The case of a single label host is different, because
2148 * a single label host should never get a labeled packet
2149 * even though the label is usually associated with a packet
2153 bh_lock_sock_nested(sk
);
2155 if (ssp
->smk_out
== smack_net_ambient
||
2156 labeled
== SMACK_UNLABELED_SOCKET
)
2157 netlbl_sock_delattr(sk
);
2160 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2170 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2172 * @sap: the destination address
2174 * Set the correct secattr for the given socket based on the destination
2175 * address and perform any outbound access checks needed.
2177 * Returns 0 on success or an error code.
2180 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2182 struct smack_known
*skp
;
2185 struct smack_known
*hkp
;
2186 struct socket_smack
*ssp
= sk
->sk_security
;
2187 struct smk_audit_info ad
;
2190 hkp
= smack_host_label(sap
);
2193 struct lsm_network_audit net
;
2195 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2196 ad
.a
.u
.net
->family
= sap
->sin_family
;
2197 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2198 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2200 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2202 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2203 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2205 sk_lbl
= SMACK_CIPSO_SOCKET
;
2212 return smack_netlabel(sk
, sk_lbl
);
2216 * smk_ipv6_port_label - Smack port access table management
2220 * Create or update the port list entry
2222 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2224 struct sock
*sk
= sock
->sk
;
2225 struct sockaddr_in6
*addr6
;
2226 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2227 struct smk_port_label
*spp
;
2228 unsigned short port
= 0;
2230 if (address
== NULL
) {
2232 * This operation is changing the Smack information
2233 * on the bound socket. Take the changes to the port
2236 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2237 if (sk
!= spp
->smk_sock
)
2239 spp
->smk_in
= ssp
->smk_in
;
2240 spp
->smk_out
= ssp
->smk_out
;
2244 * A NULL address is only used for updating existing
2245 * bound entries. If there isn't one, it's OK.
2250 addr6
= (struct sockaddr_in6
*)address
;
2251 port
= ntohs(addr6
->sin6_port
);
2253 * This is a special case that is safely ignored.
2259 * Look for an existing port list entry.
2260 * This is an indication that a port is getting reused.
2262 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2263 if (spp
->smk_port
!= port
)
2265 spp
->smk_port
= port
;
2267 spp
->smk_in
= ssp
->smk_in
;
2268 spp
->smk_out
= ssp
->smk_out
;
2273 * A new port entry is required.
2275 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2279 spp
->smk_port
= port
;
2281 spp
->smk_in
= ssp
->smk_in
;
2282 spp
->smk_out
= ssp
->smk_out
;
2284 list_add(&spp
->list
, &smk_ipv6_port_list
);
2289 * smk_ipv6_port_check - check Smack port access
2293 * Create or update the port list entry
2295 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2300 struct smk_port_label
*spp
;
2301 struct socket_smack
*ssp
= sk
->sk_security
;
2302 struct smack_known
*skp
;
2303 unsigned short port
= 0;
2304 struct smack_known
*object
;
2305 struct smk_audit_info ad
;
2308 struct lsm_network_audit net
;
2311 if (act
== SMK_RECEIVING
) {
2312 skp
= smack_net_ambient
;
2313 object
= ssp
->smk_in
;
2316 object
= smack_net_ambient
;
2320 * Get the IP address and port from the address.
2322 port
= ntohs(address
->sin6_port
);
2323 bep
= (__be16
*)(&address
->sin6_addr
);
2324 be32p
= (__be32
*)(&address
->sin6_addr
);
2327 * It's remote, so port lookup does no good.
2329 if (be32p
[0] || be32p
[1] || be32p
[2] || bep
[6] || ntohs(bep
[7]) != 1)
2333 * It's local so the send check has to have passed.
2335 if (act
== SMK_RECEIVING
) {
2336 skp
= &smack_known_web
;
2340 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2341 if (spp
->smk_port
!= port
)
2343 object
= spp
->smk_in
;
2344 if (act
== SMK_CONNECTING
)
2345 ssp
->smk_packet
= spp
->smk_out
;
2352 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2353 ad
.a
.u
.net
->family
= sk
->sk_family
;
2354 ad
.a
.u
.net
->dport
= port
;
2355 if (act
== SMK_RECEIVING
)
2356 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2358 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2360 rc
= smk_access(skp
, object
, MAY_WRITE
, &ad
);
2361 rc
= smk_bu_note("IPv6 port check", skp
, object
, MAY_WRITE
, rc
);
2366 * smack_inode_setsecurity - set smack xattrs
2367 * @inode: the object
2368 * @name: attribute name
2369 * @value: attribute value
2370 * @size: size of the attribute
2373 * Sets the named attribute in the appropriate blob
2375 * Returns 0 on success, or an error code
2377 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2378 const void *value
, size_t size
, int flags
)
2380 struct smack_known
*skp
;
2381 struct inode_smack
*nsp
= inode
->i_security
;
2382 struct socket_smack
*ssp
;
2383 struct socket
*sock
;
2386 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2389 skp
= smk_import_entry(value
, size
);
2393 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2394 nsp
->smk_inode
= skp
;
2395 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2399 * The rest of the Smack xattrs are only on sockets.
2401 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2404 sock
= SOCKET_I(inode
);
2405 if (sock
== NULL
|| sock
->sk
== NULL
)
2408 ssp
= sock
->sk
->sk_security
;
2410 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2412 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2414 if (sock
->sk
->sk_family
== PF_INET
) {
2415 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2418 "Smack: \"%s\" netlbl error %d.\n",
2424 if (sock
->sk
->sk_family
== PF_INET6
)
2425 smk_ipv6_port_label(sock
, NULL
);
2431 * smack_socket_post_create - finish socket setup
2433 * @family: protocol family
2438 * Sets the netlabel information on the socket
2440 * Returns 0 on success, and error code otherwise
2442 static int smack_socket_post_create(struct socket
*sock
, int family
,
2443 int type
, int protocol
, int kern
)
2445 if (family
!= PF_INET
|| sock
->sk
== NULL
)
2448 * Set the outbound netlbl.
2450 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2454 * smack_socket_bind - record port binding information.
2456 * @address: the port address
2457 * @addrlen: size of the address
2459 * Records the label bound to a port.
2463 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2466 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2467 smk_ipv6_port_label(sock
, address
);
2473 * smack_socket_connect - connect access check
2475 * @sap: the other end
2476 * @addrlen: size of sap
2478 * Verifies that a connection may be possible
2480 * Returns 0 on success, and error code otherwise
2482 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2487 if (sock
->sk
== NULL
)
2490 switch (sock
->sk
->sk_family
) {
2492 if (addrlen
< sizeof(struct sockaddr_in
))
2494 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2497 if (addrlen
< sizeof(struct sockaddr_in6
))
2499 rc
= smk_ipv6_port_check(sock
->sk
, (struct sockaddr_in6
*)sap
,
2507 * smack_flags_to_may - convert S_ to MAY_ values
2508 * @flags: the S_ value
2510 * Returns the equivalent MAY_ value
2512 static int smack_flags_to_may(int flags
)
2516 if (flags
& S_IRUGO
)
2518 if (flags
& S_IWUGO
)
2520 if (flags
& S_IXUGO
)
2527 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2532 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2534 struct smack_known
*skp
= smk_of_current();
2536 msg
->security
= skp
;
2541 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2544 * Clears the blob pointer
2546 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2548 msg
->security
= NULL
;
2552 * smack_of_shm - the smack pointer for the shm
2555 * Returns a pointer to the smack value
2557 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2559 return (struct smack_known
*)shp
->shm_perm
.security
;
2563 * smack_shm_alloc_security - Set the security blob for shm
2568 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2570 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2571 struct smack_known
*skp
= smk_of_current();
2573 isp
->security
= skp
;
2578 * smack_shm_free_security - Clear the security blob for shm
2581 * Clears the blob pointer
2583 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2585 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2587 isp
->security
= NULL
;
2591 * smk_curacc_shm : check if current has access on shm
2593 * @access : access requested
2595 * Returns 0 if current has the requested access, error code otherwise
2597 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2599 struct smack_known
*ssp
= smack_of_shm(shp
);
2600 struct smk_audit_info ad
;
2604 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2605 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2607 rc
= smk_curacc(ssp
, access
, &ad
);
2608 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2613 * smack_shm_associate - Smack access check for shm
2615 * @shmflg: access requested
2617 * Returns 0 if current has the requested access, error code otherwise
2619 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2623 may
= smack_flags_to_may(shmflg
);
2624 return smk_curacc_shm(shp
, may
);
2628 * smack_shm_shmctl - Smack access check for shm
2630 * @cmd: what it wants to do
2632 * Returns 0 if current has the requested access, error code otherwise
2634 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2647 may
= MAY_READWRITE
;
2652 * System level information.
2658 return smk_curacc_shm(shp
, may
);
2662 * smack_shm_shmat - Smack access for shmat
2665 * @shmflg: access requested
2667 * Returns 0 if current has the requested access, error code otherwise
2669 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2674 may
= smack_flags_to_may(shmflg
);
2675 return smk_curacc_shm(shp
, may
);
2679 * smack_of_sem - the smack pointer for the sem
2682 * Returns a pointer to the smack value
2684 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
2686 return (struct smack_known
*)sma
->sem_perm
.security
;
2690 * smack_sem_alloc_security - Set the security blob for sem
2695 static int smack_sem_alloc_security(struct sem_array
*sma
)
2697 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2698 struct smack_known
*skp
= smk_of_current();
2700 isp
->security
= skp
;
2705 * smack_sem_free_security - Clear the security blob for sem
2708 * Clears the blob pointer
2710 static void smack_sem_free_security(struct sem_array
*sma
)
2712 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
2714 isp
->security
= NULL
;
2718 * smk_curacc_sem : check if current has access on sem
2720 * @access : access requested
2722 * Returns 0 if current has the requested access, error code otherwise
2724 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
2726 struct smack_known
*ssp
= smack_of_sem(sma
);
2727 struct smk_audit_info ad
;
2731 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2732 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
2734 rc
= smk_curacc(ssp
, access
, &ad
);
2735 rc
= smk_bu_current("sem", ssp
, access
, rc
);
2740 * smack_sem_associate - Smack access check for sem
2742 * @semflg: access requested
2744 * Returns 0 if current has the requested access, error code otherwise
2746 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
2750 may
= smack_flags_to_may(semflg
);
2751 return smk_curacc_sem(sma
, may
);
2755 * smack_sem_shmctl - Smack access check for sem
2757 * @cmd: what it wants to do
2759 * Returns 0 if current has the requested access, error code otherwise
2761 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
2779 may
= MAY_READWRITE
;
2784 * System level information
2791 return smk_curacc_sem(sma
, may
);
2795 * smack_sem_semop - Smack checks of semaphore operations
2801 * Treated as read and write in all cases.
2803 * Returns 0 if access is allowed, error code otherwise
2805 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
2806 unsigned nsops
, int alter
)
2808 return smk_curacc_sem(sma
, MAY_READWRITE
);
2812 * smack_msg_alloc_security - Set the security blob for msg
2817 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
2819 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2820 struct smack_known
*skp
= smk_of_current();
2822 kisp
->security
= skp
;
2827 * smack_msg_free_security - Clear the security blob for msg
2830 * Clears the blob pointer
2832 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
2834 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
2836 kisp
->security
= NULL
;
2840 * smack_of_msq - the smack pointer for the msq
2843 * Returns a pointer to the smack label entry
2845 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
2847 return (struct smack_known
*)msq
->q_perm
.security
;
2851 * smk_curacc_msq : helper to check if current has access on msq
2853 * @access : access requested
2855 * return 0 if current has access, error otherwise
2857 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
2859 struct smack_known
*msp
= smack_of_msq(msq
);
2860 struct smk_audit_info ad
;
2864 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2865 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
2867 rc
= smk_curacc(msp
, access
, &ad
);
2868 rc
= smk_bu_current("msq", msp
, access
, rc
);
2873 * smack_msg_queue_associate - Smack access check for msg_queue
2875 * @msqflg: access requested
2877 * Returns 0 if current has the requested access, error code otherwise
2879 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
2883 may
= smack_flags_to_may(msqflg
);
2884 return smk_curacc_msq(msq
, may
);
2888 * smack_msg_queue_msgctl - Smack access check for msg_queue
2890 * @cmd: what it wants to do
2892 * Returns 0 if current has the requested access, error code otherwise
2894 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
2905 may
= MAY_READWRITE
;
2910 * System level information
2917 return smk_curacc_msq(msq
, may
);
2921 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2924 * @msqflg: access requested
2926 * Returns 0 if current has the requested access, error code otherwise
2928 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
2933 may
= smack_flags_to_may(msqflg
);
2934 return smk_curacc_msq(msq
, may
);
2938 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2945 * Returns 0 if current has read and write access, error code otherwise
2947 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
2948 struct task_struct
*target
, long type
, int mode
)
2950 return smk_curacc_msq(msq
, MAY_READWRITE
);
2954 * smack_ipc_permission - Smack access for ipc_permission()
2955 * @ipp: the object permissions
2956 * @flag: access requested
2958 * Returns 0 if current has read and write access, error code otherwise
2960 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
2962 struct smack_known
*iskp
= ipp
->security
;
2963 int may
= smack_flags_to_may(flag
);
2964 struct smk_audit_info ad
;
2968 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2969 ad
.a
.u
.ipc_id
= ipp
->id
;
2971 rc
= smk_curacc(iskp
, may
, &ad
);
2972 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
2977 * smack_ipc_getsecid - Extract smack security id
2978 * @ipp: the object permissions
2979 * @secid: where result will be saved
2981 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
2983 struct smack_known
*iskp
= ipp
->security
;
2985 *secid
= iskp
->smk_secid
;
2989 * smack_d_instantiate - Make sure the blob is correct on an inode
2990 * @opt_dentry: dentry where inode will be attached
2991 * @inode: the object
2993 * Set the inode's security blob if it hasn't been done already.
2995 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
2997 struct super_block
*sbp
;
2998 struct superblock_smack
*sbsp
;
2999 struct inode_smack
*isp
;
3000 struct smack_known
*skp
;
3001 struct smack_known
*ckp
= smk_of_current();
3002 struct smack_known
*final
;
3003 char trattr
[TRANS_TRUE_SIZE
];
3011 isp
= inode
->i_security
;
3013 mutex_lock(&isp
->smk_lock
);
3015 * If the inode is already instantiated
3016 * take the quick way out
3018 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3022 sbsp
= sbp
->s_security
;
3024 * We're going to use the superblock default label
3025 * if there's no label on the file.
3027 final
= sbsp
->smk_default
;
3030 * If this is the root inode the superblock
3031 * may be in the process of initialization.
3032 * If that is the case use the root value out
3033 * of the superblock.
3035 if (opt_dentry
->d_parent
== opt_dentry
) {
3036 if (sbp
->s_magic
== CGROUP_SUPER_MAGIC
) {
3038 * The cgroup filesystem is never mounted,
3039 * so there's no opportunity to set the mount
3042 sbsp
->smk_root
= &smack_known_star
;
3043 sbsp
->smk_default
= &smack_known_star
;
3045 isp
->smk_inode
= sbsp
->smk_root
;
3046 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3051 * This is pretty hackish.
3052 * Casey says that we shouldn't have to do
3053 * file system specific code, but it does help
3054 * with keeping it simple.
3056 switch (sbp
->s_magic
) {
3060 case CGROUP_SUPER_MAGIC
:
3062 * Casey says that it's a little embarrassing
3063 * that the smack file system doesn't do
3064 * extended attributes.
3066 * Casey says pipes are easy (?)
3068 * Socket access is controlled by the socket
3069 * structures associated with the task involved.
3071 * Cgroupfs is special
3073 final
= &smack_known_star
;
3075 case DEVPTS_SUPER_MAGIC
:
3077 * devpts seems content with the label of the task.
3078 * Programs that change smack have to treat the
3083 case PROC_SUPER_MAGIC
:
3085 * Casey says procfs appears not to care.
3086 * The superblock default suffices.
3091 * Device labels should come from the filesystem,
3092 * but watch out, because they're volitile,
3093 * getting recreated on every reboot.
3095 final
= &smack_known_star
;
3099 * If a smack value has been set we want to use it,
3100 * but since tmpfs isn't giving us the opportunity
3101 * to set mount options simulate setting the
3102 * superblock default.
3106 * This isn't an understood special case.
3107 * Get the value from the xattr.
3111 * UNIX domain sockets use lower level socket data.
3113 if (S_ISSOCK(inode
->i_mode
)) {
3114 final
= &smack_known_star
;
3118 * No xattr support means, alas, no SMACK label.
3119 * Use the aforeapplied default.
3120 * It would be curious if the label of the task
3121 * does not match that assigned.
3123 if (inode
->i_op
->getxattr
== NULL
)
3126 * Get the dentry for xattr.
3128 dp
= dget(opt_dentry
);
3129 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3134 * Transmuting directory
3136 if (S_ISDIR(inode
->i_mode
)) {
3138 * If this is a new directory and the label was
3139 * transmuted when the inode was initialized
3140 * set the transmute attribute on the directory
3141 * and mark the inode.
3143 * If there is a transmute attribute on the
3144 * directory mark the inode.
3146 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3147 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3148 rc
= inode
->i_op
->setxattr(dp
,
3149 XATTR_NAME_SMACKTRANSMUTE
,
3150 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3153 rc
= inode
->i_op
->getxattr(dp
,
3154 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3156 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3157 TRANS_TRUE_SIZE
) != 0)
3161 transflag
= SMK_INODE_TRANSMUTE
;
3164 * Don't let the exec or mmap label be "*" or "@".
3166 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3167 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3169 isp
->smk_task
= skp
;
3170 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3171 if (skp
== &smack_known_star
|| skp
== &smack_known_web
)
3173 isp
->smk_mmap
= skp
;
3180 isp
->smk_inode
= ckp
;
3182 isp
->smk_inode
= final
;
3184 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3187 mutex_unlock(&isp
->smk_lock
);
3192 * smack_getprocattr - Smack process attribute access
3193 * @p: the object task
3194 * @name: the name of the attribute in /proc/.../attr
3195 * @value: where to put the result
3197 * Places a copy of the task Smack into value
3199 * Returns the length of the smack label or an error code
3201 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3203 struct smack_known
*skp
= smk_of_task(task_security(p
));
3207 if (strcmp(name
, "current") != 0)
3210 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3220 * smack_setprocattr - Smack process attribute setting
3221 * @p: the object task
3222 * @name: the name of the attribute in /proc/.../attr
3223 * @value: the value to set
3224 * @size: the size of the value
3226 * Sets the Smack value of the task. Only setting self
3227 * is permitted and only with privilege
3229 * Returns the length of the smack label or an error code
3231 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3232 void *value
, size_t size
)
3234 struct task_smack
*tsp
;
3236 struct smack_known
*skp
;
3239 * Changing another process' Smack value is too dangerous
3240 * and supports no sane use case.
3245 if (!smack_privileged(CAP_MAC_ADMIN
))
3248 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3251 if (strcmp(name
, "current") != 0)
3254 skp
= smk_import_entry(value
, size
);
3259 * No process is ever allowed the web ("@") label.
3261 if (skp
== &smack_known_web
)
3264 new = prepare_creds();
3268 tsp
= new->security
;
3269 tsp
->smk_task
= skp
;
3276 * smack_unix_stream_connect - Smack access on UDS
3278 * @other: the other sock
3281 * Return 0 if a subject with the smack of sock could access
3282 * an object with the smack of other, otherwise an error code
3284 static int smack_unix_stream_connect(struct sock
*sock
,
3285 struct sock
*other
, struct sock
*newsk
)
3287 struct smack_known
*skp
;
3288 struct smack_known
*okp
;
3289 struct socket_smack
*ssp
= sock
->sk_security
;
3290 struct socket_smack
*osp
= other
->sk_security
;
3291 struct socket_smack
*nsp
= newsk
->sk_security
;
3292 struct smk_audit_info ad
;
3295 struct lsm_network_audit net
;
3298 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3302 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3303 smk_ad_setfield_u_net_sk(&ad
, other
);
3305 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3306 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3308 rc
= smk_access(okp
, skp
, MAY_WRITE
, NULL
);
3309 rc
= smk_bu_note("UDS connect", okp
, skp
,
3315 * Cross reference the peer labels for SO_PEERSEC.
3318 nsp
->smk_packet
= ssp
->smk_out
;
3319 ssp
->smk_packet
= osp
->smk_out
;
3326 * smack_unix_may_send - Smack access on UDS
3328 * @other: the other socket
3330 * Return 0 if a subject with the smack of sock could access
3331 * an object with the smack of other, otherwise an error code
3333 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3335 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3336 struct socket_smack
*osp
= other
->sk
->sk_security
;
3337 struct smk_audit_info ad
;
3341 struct lsm_network_audit net
;
3343 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3344 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3347 if (smack_privileged(CAP_MAC_OVERRIDE
))
3350 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3351 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3356 * smack_socket_sendmsg - Smack check based on destination host
3359 * @size: the size of the message
3361 * Return 0 if the current subject can write to the destination host.
3362 * For IPv4 this is only a question if the destination is a single label host.
3363 * For IPv6 this is a check against the label of the port.
3365 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3368 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3369 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3373 * Perfectly reasonable for this to be NULL
3378 switch (sip
->sin_family
) {
3380 rc
= smack_netlabel_send(sock
->sk
, sip
);
3383 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3390 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3391 * @sap: netlabel secattr
3392 * @ssp: socket security information
3394 * Returns a pointer to a Smack label entry found on the label list.
3396 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3397 struct socket_smack
*ssp
)
3399 struct smack_known
*skp
;
3404 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3406 * Looks like a CIPSO packet.
3407 * If there are flags but no level netlabel isn't
3408 * behaving the way we expect it to.
3410 * Look it up in the label table
3411 * Without guidance regarding the smack value
3412 * for the packet fall back on the network
3416 list_for_each_entry(skp
, &smack_known_list
, list
) {
3417 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3420 * Compare the catsets. Use the netlbl APIs.
3422 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3423 if ((skp
->smk_netlabel
.flags
&
3424 NETLBL_SECATTR_MLS_CAT
) == 0)
3428 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3429 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3431 kcat
= netlbl_catmap_walk(
3432 skp
->smk_netlabel
.attr
.mls
.cat
,
3434 if (acat
< 0 || kcat
< 0)
3447 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3448 return &smack_known_web
;
3449 return &smack_known_star
;
3451 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3453 * Looks like a fallback, which gives us a secid.
3455 skp
= smack_from_secid(sap
->attr
.secid
);
3457 * This has got to be a bug because it is
3458 * impossible to specify a fallback without
3459 * specifying the label, which will ensure
3460 * it has a secid, and the only way to get a
3461 * secid is from a fallback.
3463 BUG_ON(skp
== NULL
);
3467 * Without guidance regarding the smack value
3468 * for the packet fall back on the network
3471 return smack_net_ambient
;
3474 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3478 int proto
= -EINVAL
;
3479 struct ipv6hdr _ipv6h
;
3480 struct ipv6hdr
*ip6
;
3482 struct tcphdr _tcph
, *th
;
3483 struct udphdr _udph
, *uh
;
3484 struct dccp_hdr _dccph
, *dh
;
3488 offset
= skb_network_offset(skb
);
3489 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3492 sip
->sin6_addr
= ip6
->saddr
;
3494 nexthdr
= ip6
->nexthdr
;
3495 offset
+= sizeof(_ipv6h
);
3496 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3503 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3505 sip
->sin6_port
= th
->source
;
3508 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3510 sip
->sin6_port
= uh
->source
;
3513 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3515 sip
->sin6_port
= dh
->dccph_sport
;
3522 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3526 * Returns 0 if the packet should be delivered, an error code otherwise
3528 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3530 struct netlbl_lsm_secattr secattr
;
3531 struct socket_smack
*ssp
= sk
->sk_security
;
3532 struct smack_known
*skp
;
3533 struct sockaddr_in6 sadd
;
3535 struct smk_audit_info ad
;
3537 struct lsm_network_audit net
;
3539 switch (sk
->sk_family
) {
3542 * Translate what netlabel gave us.
3544 netlbl_secattr_init(&secattr
);
3546 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3548 skp
= smack_from_secattr(&secattr
, ssp
);
3550 skp
= smack_net_ambient
;
3552 netlbl_secattr_destroy(&secattr
);
3555 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3556 ad
.a
.u
.net
->family
= sk
->sk_family
;
3557 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3558 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3561 * Receiving a packet requires that the other end
3562 * be able to write here. Read access is not required.
3563 * This is the simplist possible security model
3566 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3567 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3570 netlbl_skbuff_err(skb
, rc
, 0);
3573 rc
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3574 if (rc
== IPPROTO_UDP
|| rc
== IPPROTO_TCP
)
3575 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3584 * smack_socket_getpeersec_stream - pull in packet label
3586 * @optval: user's destination
3587 * @optlen: size thereof
3590 * returns zero on success, an error code otherwise
3592 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3593 char __user
*optval
,
3594 int __user
*optlen
, unsigned len
)
3596 struct socket_smack
*ssp
;
3601 ssp
= sock
->sk
->sk_security
;
3602 if (ssp
->smk_packet
!= NULL
) {
3603 rcp
= ssp
->smk_packet
->smk_known
;
3604 slen
= strlen(rcp
) + 1;
3609 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3612 if (put_user(slen
, optlen
) != 0)
3620 * smack_socket_getpeersec_dgram - pull in packet label
3621 * @sock: the peer socket
3623 * @secid: pointer to where to put the secid of the packet
3625 * Sets the netlabel socket state on sk from parent
3627 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
3628 struct sk_buff
*skb
, u32
*secid
)
3631 struct netlbl_lsm_secattr secattr
;
3632 struct socket_smack
*ssp
= NULL
;
3633 struct smack_known
*skp
;
3634 int family
= PF_UNSPEC
;
3635 u32 s
= 0; /* 0 is the invalid secid */
3639 if (skb
->protocol
== htons(ETH_P_IP
))
3641 else if (skb
->protocol
== htons(ETH_P_IPV6
))
3644 if (family
== PF_UNSPEC
&& sock
!= NULL
)
3645 family
= sock
->sk
->sk_family
;
3647 if (family
== PF_UNIX
) {
3648 ssp
= sock
->sk
->sk_security
;
3649 s
= ssp
->smk_out
->smk_secid
;
3650 } else if (family
== PF_INET
|| family
== PF_INET6
) {
3652 * Translate what netlabel gave us.
3654 if (sock
!= NULL
&& sock
->sk
!= NULL
)
3655 ssp
= sock
->sk
->sk_security
;
3656 netlbl_secattr_init(&secattr
);
3657 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3659 skp
= smack_from_secattr(&secattr
, ssp
);
3662 netlbl_secattr_destroy(&secattr
);
3671 * smack_sock_graft - Initialize a newly created socket with an existing sock
3673 * @parent: parent socket
3675 * Set the smk_{in,out} state of an existing sock based on the process that
3676 * is creating the new socket.
3678 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
3680 struct socket_smack
*ssp
;
3681 struct smack_known
*skp
= smk_of_current();
3684 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
3687 ssp
= sk
->sk_security
;
3690 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3694 * smack_inet_conn_request - Smack access check on connect
3695 * @sk: socket involved
3699 * Returns 0 if a task with the packet label could write to
3700 * the socket, otherwise an error code
3702 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
3703 struct request_sock
*req
)
3705 u16 family
= sk
->sk_family
;
3706 struct smack_known
*skp
;
3707 struct socket_smack
*ssp
= sk
->sk_security
;
3708 struct netlbl_lsm_secattr secattr
;
3709 struct sockaddr_in addr
;
3711 struct smack_known
*hskp
;
3713 struct smk_audit_info ad
;
3715 struct lsm_network_audit net
;
3718 if (family
== PF_INET6
) {
3720 * Handle mapped IPv4 packets arriving
3721 * via IPv6 sockets. Don't set up netlabel
3722 * processing on IPv6.
3724 if (skb
->protocol
== htons(ETH_P_IP
))
3730 netlbl_secattr_init(&secattr
);
3731 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
3733 skp
= smack_from_secattr(&secattr
, ssp
);
3735 skp
= &smack_known_huh
;
3736 netlbl_secattr_destroy(&secattr
);
3739 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3740 ad
.a
.u
.net
->family
= family
;
3741 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3742 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3745 * Receiving a packet requires that the other end be able to write
3746 * here. Read access is not required.
3748 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3749 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
3754 * Save the peer's label in the request_sock so we can later setup
3755 * smk_packet in the child socket so that SO_PEERCRED can report it.
3757 req
->peer_secid
= skp
->smk_secid
;
3760 * We need to decide if we want to label the incoming connection here
3761 * if we do we only need to label the request_sock and the stack will
3762 * propagate the wire-label to the sock when it is created.
3765 addr
.sin_addr
.s_addr
= hdr
->saddr
;
3767 hskp
= smack_host_label(&addr
);
3771 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
3773 netlbl_req_delattr(req
);
3779 * smack_inet_csk_clone - Copy the connection information to the new socket
3780 * @sk: the new socket
3781 * @req: the connection's request_sock
3783 * Transfer the connection's peer label to the newly created socket.
3785 static void smack_inet_csk_clone(struct sock
*sk
,
3786 const struct request_sock
*req
)
3788 struct socket_smack
*ssp
= sk
->sk_security
;
3789 struct smack_known
*skp
;
3791 if (req
->peer_secid
!= 0) {
3792 skp
= smack_from_secid(req
->peer_secid
);
3793 ssp
->smk_packet
= skp
;
3795 ssp
->smk_packet
= NULL
;
3799 * Key management security hooks
3801 * Casey has not tested key support very heavily.
3802 * The permission check is most likely too restrictive.
3803 * If you care about keys please have a look.
3808 * smack_key_alloc - Set the key security blob
3810 * @cred: the credentials to use
3813 * No allocation required
3817 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
3818 unsigned long flags
)
3820 struct smack_known
*skp
= smk_of_task(cred
->security
);
3822 key
->security
= skp
;
3827 * smack_key_free - Clear the key security blob
3830 * Clear the blob pointer
3832 static void smack_key_free(struct key
*key
)
3834 key
->security
= NULL
;
3838 * smack_key_permission - Smack access on a key
3839 * @key_ref: gets to the object
3840 * @cred: the credentials to use
3843 * Return 0 if the task has read and write to the object,
3844 * an error code otherwise
3846 static int smack_key_permission(key_ref_t key_ref
,
3847 const struct cred
*cred
, unsigned perm
)
3850 struct smk_audit_info ad
;
3851 struct smack_known
*tkp
= smk_of_task(cred
->security
);
3855 keyp
= key_ref_to_ptr(key_ref
);
3859 * If the key hasn't been initialized give it access so that
3862 if (keyp
->security
== NULL
)
3865 * This should not occur
3870 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
3871 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
3872 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
3874 if (perm
& KEY_NEED_READ
)
3876 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
3877 request
= MAY_WRITE
;
3878 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
3879 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
3882 #endif /* CONFIG_KEYS */
3887 * Audit requires a unique representation of each Smack specific
3888 * rule. This unique representation is used to distinguish the
3889 * object to be audited from remaining kernel objects and also
3890 * works as a glue between the audit hooks.
3892 * Since repository entries are added but never deleted, we'll use
3893 * the smack_known label address related to the given audit rule as
3894 * the needed unique representation. This also better fits the smack
3895 * model where nearly everything is a label.
3900 * smack_audit_rule_init - Initialize a smack audit rule
3901 * @field: audit rule fields given from user-space (audit.h)
3902 * @op: required testing operator (=, !=, >, <, ...)
3903 * @rulestr: smack label to be audited
3904 * @vrule: pointer to save our own audit rule representation
3906 * Prepare to audit cases where (@field @op @rulestr) is true.
3907 * The label to be audited is created if necessay.
3909 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
3911 struct smack_known
*skp
;
3912 char **rule
= (char **)vrule
;
3915 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3918 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
3921 skp
= smk_import_entry(rulestr
, 0);
3923 *rule
= skp
->smk_known
;
3929 * smack_audit_rule_known - Distinguish Smack audit rules
3930 * @krule: rule of interest, in Audit kernel representation format
3932 * This is used to filter Smack rules from remaining Audit ones.
3933 * If it's proved that this rule belongs to us, the
3934 * audit_rule_match hook will be called to do the final judgement.
3936 static int smack_audit_rule_known(struct audit_krule
*krule
)
3938 struct audit_field
*f
;
3941 for (i
= 0; i
< krule
->field_count
; i
++) {
3942 f
= &krule
->fields
[i
];
3944 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
3952 * smack_audit_rule_match - Audit given object ?
3953 * @secid: security id for identifying the object to test
3954 * @field: audit rule flags given from user-space
3955 * @op: required testing operator
3956 * @vrule: smack internal rule presentation
3957 * @actx: audit context associated with the check
3959 * The core Audit hook. It's used to take the decision of
3960 * whether to audit or not to audit a given object.
3962 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
3963 struct audit_context
*actx
)
3965 struct smack_known
*skp
;
3968 if (unlikely(!rule
)) {
3969 WARN_ONCE(1, "Smack: missing rule\n");
3973 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
3976 skp
= smack_from_secid(secid
);
3979 * No need to do string comparisons. If a match occurs,
3980 * both pointers will point to the same smack_known
3983 if (op
== Audit_equal
)
3984 return (rule
== skp
->smk_known
);
3985 if (op
== Audit_not_equal
)
3986 return (rule
!= skp
->smk_known
);
3992 * smack_audit_rule_free - free smack rule representation
3993 * @vrule: rule to be freed.
3995 * No memory was allocated.
3997 static void smack_audit_rule_free(void *vrule
)
4002 #endif /* CONFIG_AUDIT */
4005 * smack_ismaclabel - check if xattr @name references a smack MAC label
4006 * @name: Full xattr name to check.
4008 static int smack_ismaclabel(const char *name
)
4010 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4015 * smack_secid_to_secctx - return the smack label for a secid
4016 * @secid: incoming integer
4017 * @secdata: destination
4018 * @seclen: how long it is
4020 * Exists for networking code.
4022 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4024 struct smack_known
*skp
= smack_from_secid(secid
);
4027 *secdata
= skp
->smk_known
;
4028 *seclen
= strlen(skp
->smk_known
);
4033 * smack_secctx_to_secid - return the secid for a smack label
4034 * @secdata: smack label
4035 * @seclen: how long result is
4036 * @secid: outgoing integer
4038 * Exists for audit and networking code.
4040 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4042 struct smack_known
*skp
= smk_find_entry(secdata
);
4045 *secid
= skp
->smk_secid
;
4052 * smack_release_secctx - don't do anything.
4056 * Exists to make sure nothing gets done, and properly
4058 static void smack_release_secctx(char *secdata
, u32 seclen
)
4062 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4064 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4067 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4069 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4072 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4075 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4083 struct security_operations smack_ops
= {
4086 .ptrace_access_check
= smack_ptrace_access_check
,
4087 .ptrace_traceme
= smack_ptrace_traceme
,
4088 .syslog
= smack_syslog
,
4090 .sb_alloc_security
= smack_sb_alloc_security
,
4091 .sb_free_security
= smack_sb_free_security
,
4092 .sb_copy_data
= smack_sb_copy_data
,
4093 .sb_kern_mount
= smack_sb_kern_mount
,
4094 .sb_statfs
= smack_sb_statfs
,
4096 .bprm_set_creds
= smack_bprm_set_creds
,
4097 .bprm_committing_creds
= smack_bprm_committing_creds
,
4098 .bprm_secureexec
= smack_bprm_secureexec
,
4100 .inode_alloc_security
= smack_inode_alloc_security
,
4101 .inode_free_security
= smack_inode_free_security
,
4102 .inode_init_security
= smack_inode_init_security
,
4103 .inode_link
= smack_inode_link
,
4104 .inode_unlink
= smack_inode_unlink
,
4105 .inode_rmdir
= smack_inode_rmdir
,
4106 .inode_rename
= smack_inode_rename
,
4107 .inode_permission
= smack_inode_permission
,
4108 .inode_setattr
= smack_inode_setattr
,
4109 .inode_getattr
= smack_inode_getattr
,
4110 .inode_setxattr
= smack_inode_setxattr
,
4111 .inode_post_setxattr
= smack_inode_post_setxattr
,
4112 .inode_getxattr
= smack_inode_getxattr
,
4113 .inode_removexattr
= smack_inode_removexattr
,
4114 .inode_getsecurity
= smack_inode_getsecurity
,
4115 .inode_setsecurity
= smack_inode_setsecurity
,
4116 .inode_listsecurity
= smack_inode_listsecurity
,
4117 .inode_getsecid
= smack_inode_getsecid
,
4119 .file_permission
= smack_file_permission
,
4120 .file_alloc_security
= smack_file_alloc_security
,
4121 .file_free_security
= smack_file_free_security
,
4122 .file_ioctl
= smack_file_ioctl
,
4123 .file_lock
= smack_file_lock
,
4124 .file_fcntl
= smack_file_fcntl
,
4125 .mmap_file
= smack_mmap_file
,
4126 .mmap_addr
= cap_mmap_addr
,
4127 .file_set_fowner
= smack_file_set_fowner
,
4128 .file_send_sigiotask
= smack_file_send_sigiotask
,
4129 .file_receive
= smack_file_receive
,
4131 .file_open
= smack_file_open
,
4133 .cred_alloc_blank
= smack_cred_alloc_blank
,
4134 .cred_free
= smack_cred_free
,
4135 .cred_prepare
= smack_cred_prepare
,
4136 .cred_transfer
= smack_cred_transfer
,
4137 .kernel_act_as
= smack_kernel_act_as
,
4138 .kernel_create_files_as
= smack_kernel_create_files_as
,
4139 .task_setpgid
= smack_task_setpgid
,
4140 .task_getpgid
= smack_task_getpgid
,
4141 .task_getsid
= smack_task_getsid
,
4142 .task_getsecid
= smack_task_getsecid
,
4143 .task_setnice
= smack_task_setnice
,
4144 .task_setioprio
= smack_task_setioprio
,
4145 .task_getioprio
= smack_task_getioprio
,
4146 .task_setscheduler
= smack_task_setscheduler
,
4147 .task_getscheduler
= smack_task_getscheduler
,
4148 .task_movememory
= smack_task_movememory
,
4149 .task_kill
= smack_task_kill
,
4150 .task_wait
= smack_task_wait
,
4151 .task_to_inode
= smack_task_to_inode
,
4153 .ipc_permission
= smack_ipc_permission
,
4154 .ipc_getsecid
= smack_ipc_getsecid
,
4156 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
4157 .msg_msg_free_security
= smack_msg_msg_free_security
,
4159 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
4160 .msg_queue_free_security
= smack_msg_queue_free_security
,
4161 .msg_queue_associate
= smack_msg_queue_associate
,
4162 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
4163 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
4164 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
4166 .shm_alloc_security
= smack_shm_alloc_security
,
4167 .shm_free_security
= smack_shm_free_security
,
4168 .shm_associate
= smack_shm_associate
,
4169 .shm_shmctl
= smack_shm_shmctl
,
4170 .shm_shmat
= smack_shm_shmat
,
4172 .sem_alloc_security
= smack_sem_alloc_security
,
4173 .sem_free_security
= smack_sem_free_security
,
4174 .sem_associate
= smack_sem_associate
,
4175 .sem_semctl
= smack_sem_semctl
,
4176 .sem_semop
= smack_sem_semop
,
4178 .d_instantiate
= smack_d_instantiate
,
4180 .getprocattr
= smack_getprocattr
,
4181 .setprocattr
= smack_setprocattr
,
4183 .unix_stream_connect
= smack_unix_stream_connect
,
4184 .unix_may_send
= smack_unix_may_send
,
4186 .socket_post_create
= smack_socket_post_create
,
4187 .socket_bind
= smack_socket_bind
,
4188 .socket_connect
= smack_socket_connect
,
4189 .socket_sendmsg
= smack_socket_sendmsg
,
4190 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
4191 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
4192 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
4193 .sk_alloc_security
= smack_sk_alloc_security
,
4194 .sk_free_security
= smack_sk_free_security
,
4195 .sock_graft
= smack_sock_graft
,
4196 .inet_conn_request
= smack_inet_conn_request
,
4197 .inet_csk_clone
= smack_inet_csk_clone
,
4199 /* key management security hooks */
4201 .key_alloc
= smack_key_alloc
,
4202 .key_free
= smack_key_free
,
4203 .key_permission
= smack_key_permission
,
4204 #endif /* CONFIG_KEYS */
4208 .audit_rule_init
= smack_audit_rule_init
,
4209 .audit_rule_known
= smack_audit_rule_known
,
4210 .audit_rule_match
= smack_audit_rule_match
,
4211 .audit_rule_free
= smack_audit_rule_free
,
4212 #endif /* CONFIG_AUDIT */
4214 .ismaclabel
= smack_ismaclabel
,
4215 .secid_to_secctx
= smack_secid_to_secctx
,
4216 .secctx_to_secid
= smack_secctx_to_secid
,
4217 .release_secctx
= smack_release_secctx
,
4218 .inode_notifysecctx
= smack_inode_notifysecctx
,
4219 .inode_setsecctx
= smack_inode_setsecctx
,
4220 .inode_getsecctx
= smack_inode_getsecctx
,
4224 static __init
void init_smack_known_list(void)
4227 * Initialize rule list locks
4229 mutex_init(&smack_known_huh
.smk_rules_lock
);
4230 mutex_init(&smack_known_hat
.smk_rules_lock
);
4231 mutex_init(&smack_known_floor
.smk_rules_lock
);
4232 mutex_init(&smack_known_star
.smk_rules_lock
);
4233 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4234 mutex_init(&smack_known_web
.smk_rules_lock
);
4236 * Initialize rule lists
4238 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4239 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4240 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4241 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4242 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4243 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4245 * Create the known labels list
4247 smk_insert_entry(&smack_known_huh
);
4248 smk_insert_entry(&smack_known_hat
);
4249 smk_insert_entry(&smack_known_star
);
4250 smk_insert_entry(&smack_known_floor
);
4251 smk_insert_entry(&smack_known_invalid
);
4252 smk_insert_entry(&smack_known_web
);
4256 * smack_init - initialize the smack system
4260 static __init
int smack_init(void)
4263 struct task_smack
*tsp
;
4265 if (!security_module_enable(&smack_ops
))
4268 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4269 if (!smack_inode_cache
)
4272 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4275 kmem_cache_destroy(smack_inode_cache
);
4279 printk(KERN_INFO
"Smack: Initializing.\n");
4282 * Set the security state for the initial task.
4284 cred
= (struct cred
*) current
->cred
;
4285 cred
->security
= tsp
;
4287 /* initialize the smack_known_list */
4288 init_smack_known_list();
4293 if (register_security(&smack_ops
))
4294 panic("smack: Unable to register with kernel.\n");
4300 * Smack requires early initialization in order to label
4301 * all processes and objects when they are created.
4303 security_initcall(smack_init
);