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>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 DEFINE_MUTEX(smack_ipv6_lock
);
56 static LIST_HEAD(smk_ipv6_port_list
);
58 static struct kmem_cache
*smack_inode_cache
;
61 static const match_table_t smk_mount_tokens
= {
62 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
63 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
64 {Opt_fshat
, SMK_FSHAT
"%s"},
65 {Opt_fsroot
, SMK_FSROOT
"%s"},
66 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
70 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
71 static char *smk_bu_mess
[] = {
72 "Bringup Error", /* Unused */
73 "Bringup", /* SMACK_BRINGUP_ALLOW */
74 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
75 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
78 static void smk_bu_mode(int mode
, char *s
)
88 if (mode
& MAY_APPEND
)
90 if (mode
& MAY_TRANSMUTE
)
100 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
102 struct smack_known
*oskp
, int mode
, int rc
)
104 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
108 if (rc
> SMACK_UNCONFINED_OBJECT
)
111 smk_bu_mode(mode
, acc
);
112 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
113 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
117 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
120 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
121 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
124 struct task_smack
*tsp
= current_security();
125 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
129 if (rc
> SMACK_UNCONFINED_OBJECT
)
132 smk_bu_mode(mode
, acc
);
133 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
134 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
135 acc
, current
->comm
, note
);
139 #define smk_bu_current(note, oskp, mode, RC) (RC)
142 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
143 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
145 struct task_smack
*tsp
= current_security();
146 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
147 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
151 if (rc
> SMACK_UNCONFINED_OBJECT
)
154 smk_bu_mode(mode
, acc
);
155 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
156 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
157 current
->comm
, otp
->comm
);
161 #define smk_bu_task(otp, mode, RC) (RC)
164 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
165 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
167 struct task_smack
*tsp
= current_security();
168 struct inode_smack
*isp
= inode
->i_security
;
169 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
171 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
172 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
173 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
177 if (rc
> SMACK_UNCONFINED_OBJECT
)
179 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
180 (mode
& (MAY_WRITE
| MAY_APPEND
)))
181 isp
->smk_flags
|= SMK_INODE_IMPURE
;
183 smk_bu_mode(mode
, acc
);
185 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
186 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
187 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
191 #define smk_bu_inode(inode, mode, RC) (RC)
194 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
195 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
197 struct task_smack
*tsp
= current_security();
198 struct smack_known
*sskp
= tsp
->smk_task
;
199 struct inode
*inode
= file_inode(file
);
200 struct inode_smack
*isp
= inode
->i_security
;
201 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
203 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
204 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
205 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
209 if (rc
> SMACK_UNCONFINED_OBJECT
)
212 smk_bu_mode(mode
, acc
);
213 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
214 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
215 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
220 #define smk_bu_file(file, mode, RC) (RC)
223 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
224 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
227 struct task_smack
*tsp
= cred
->security
;
228 struct smack_known
*sskp
= tsp
->smk_task
;
229 struct inode
*inode
= file_inode(file
);
230 struct inode_smack
*isp
= inode
->i_security
;
231 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
233 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
234 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
235 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
239 if (rc
> SMACK_UNCONFINED_OBJECT
)
242 smk_bu_mode(mode
, acc
);
243 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
244 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
245 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
250 #define smk_bu_credfile(cred, file, mode, RC) (RC)
254 * smk_fetch - Fetch the smack label from a file.
255 * @name: type of the label (attribute)
256 * @ip: a pointer to the inode
257 * @dp: a pointer to the dentry
259 * Returns a pointer to the master list entry for the Smack label,
260 * NULL if there was no label to fetch, or an error code.
262 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
267 struct smack_known
*skp
= NULL
;
269 if (!(ip
->i_opflags
& IOP_XATTR
))
270 return ERR_PTR(-EOPNOTSUPP
);
272 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
274 return ERR_PTR(-ENOMEM
);
276 rc
= __vfs_getxattr(dp
, ip
, name
, buffer
, SMK_LONGLABEL
);
282 skp
= smk_import_entry(buffer
, rc
);
290 * new_inode_smack - allocate an inode security blob
291 * @skp: a pointer to the Smack label entry to use in the blob
293 * Returns the new blob or NULL if there's no memory available
295 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
297 struct inode_smack
*isp
;
299 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
303 isp
->smk_inode
= skp
;
305 mutex_init(&isp
->smk_lock
);
311 * new_task_smack - allocate a task security blob
312 * @task: a pointer to the Smack label for the running task
313 * @forked: a pointer to the Smack label for the forked task
314 * @gfp: type of the memory for the allocation
316 * Returns the new blob or NULL if there's no memory available
318 static struct task_smack
*new_task_smack(struct smack_known
*task
,
319 struct smack_known
*forked
, gfp_t gfp
)
321 struct task_smack
*tsp
;
323 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
327 tsp
->smk_task
= task
;
328 tsp
->smk_forked
= forked
;
329 INIT_LIST_HEAD(&tsp
->smk_rules
);
330 INIT_LIST_HEAD(&tsp
->smk_relabel
);
331 mutex_init(&tsp
->smk_rules_lock
);
337 * smk_copy_rules - copy a rule set
338 * @nhead: new rules header pointer
339 * @ohead: old rules header pointer
340 * @gfp: type of the memory for the allocation
342 * Returns 0 on success, -ENOMEM on error
344 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
347 struct smack_rule
*nrp
;
348 struct smack_rule
*orp
;
351 list_for_each_entry_rcu(orp
, ohead
, list
) {
352 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
358 list_add_rcu(&nrp
->list
, nhead
);
364 * smk_copy_relabel - copy smk_relabel labels list
365 * @nhead: new rules header pointer
366 * @ohead: old rules header pointer
367 * @gfp: type of the memory for the allocation
369 * Returns 0 on success, -ENOMEM on error
371 static int smk_copy_relabel(struct list_head
*nhead
, struct list_head
*ohead
,
374 struct smack_known_list_elem
*nklep
;
375 struct smack_known_list_elem
*oklep
;
377 list_for_each_entry(oklep
, ohead
, list
) {
378 nklep
= kzalloc(sizeof(struct smack_known_list_elem
), gfp
);
380 smk_destroy_label_list(nhead
);
383 nklep
->smk_label
= oklep
->smk_label
;
384 list_add(&nklep
->list
, nhead
);
391 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
392 * @mode - input mode in form of PTRACE_MODE_*
394 * Returns a converted MAY_* mode usable by smack rules
396 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
398 if (mode
& PTRACE_MODE_ATTACH
)
399 return MAY_READWRITE
;
400 if (mode
& PTRACE_MODE_READ
)
407 * smk_ptrace_rule_check - helper for ptrace access
408 * @tracer: tracer process
409 * @tracee_known: label entry of the process that's about to be traced
410 * @mode: ptrace attachment mode (PTRACE_MODE_*)
411 * @func: name of the function that called us, used for audit
413 * Returns 0 on access granted, -error on error
415 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
416 struct smack_known
*tracee_known
,
417 unsigned int mode
, const char *func
)
420 struct smk_audit_info ad
, *saip
= NULL
;
421 struct task_smack
*tsp
;
422 struct smack_known
*tracer_known
;
424 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
425 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
426 smk_ad_setfield_u_tsk(&ad
, tracer
);
431 tsp
= __task_cred(tracer
)->security
;
432 tracer_known
= smk_of_task(tsp
);
434 if ((mode
& PTRACE_MODE_ATTACH
) &&
435 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
436 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
437 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
439 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
441 else if (capable(CAP_SYS_PTRACE
))
447 smack_log(tracer_known
->smk_known
,
448 tracee_known
->smk_known
,
455 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
456 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
464 * We he, that is fun!
468 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
469 * @ctp: child task pointer
470 * @mode: ptrace attachment mode (PTRACE_MODE_*)
472 * Returns 0 if access is OK, an error code otherwise
474 * Do the capability checks.
476 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
478 struct smack_known
*skp
;
480 skp
= smk_of_task_struct(ctp
);
482 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
486 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
487 * @ptp: parent task pointer
489 * Returns 0 if access is OK, an error code otherwise
491 * Do the capability checks, and require PTRACE_MODE_ATTACH.
493 static int smack_ptrace_traceme(struct task_struct
*ptp
)
496 struct smack_known
*skp
;
498 skp
= smk_of_task(current_security());
500 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
505 * smack_syslog - Smack approval on syslog
506 * @type: message type
508 * Returns 0 on success, error code otherwise.
510 static int smack_syslog(int typefrom_file
)
513 struct smack_known
*skp
= smk_of_current();
515 if (smack_privileged(CAP_MAC_OVERRIDE
))
518 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
530 * smack_sb_alloc_security - allocate a superblock blob
531 * @sb: the superblock getting the blob
533 * Returns 0 on success or -ENOMEM on error.
535 static int smack_sb_alloc_security(struct super_block
*sb
)
537 struct superblock_smack
*sbsp
;
539 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
544 sbsp
->smk_root
= &smack_known_floor
;
545 sbsp
->smk_default
= &smack_known_floor
;
546 sbsp
->smk_floor
= &smack_known_floor
;
547 sbsp
->smk_hat
= &smack_known_hat
;
549 * SMK_SB_INITIALIZED will be zero from kzalloc.
551 sb
->s_security
= sbsp
;
557 * smack_sb_free_security - free a superblock blob
558 * @sb: the superblock getting the blob
561 static void smack_sb_free_security(struct super_block
*sb
)
563 kfree(sb
->s_security
);
564 sb
->s_security
= NULL
;
568 * smack_sb_copy_data - copy mount options data for processing
569 * @orig: where to start
570 * @smackopts: mount options string
572 * Returns 0 on success or -ENOMEM on error.
574 * Copy the Smack specific mount options out of the mount
577 static int smack_sb_copy_data(char *orig
, char *smackopts
)
579 char *cp
, *commap
, *otheropts
, *dp
;
581 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
582 if (otheropts
== NULL
)
585 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
586 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
588 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
590 else if (strstr(cp
, SMK_FSHAT
) == cp
)
592 else if (strstr(cp
, SMK_FSROOT
) == cp
)
594 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
599 commap
= strchr(cp
, ',');
608 strcpy(orig
, otheropts
);
609 free_page((unsigned long)otheropts
);
615 * smack_parse_opts_str - parse Smack specific mount options
616 * @options: mount options string
617 * @opts: where to store converted mount opts
619 * Returns 0 on success or -ENOMEM on error.
621 * converts Smack specific mount options to generic security option format
623 static int smack_parse_opts_str(char *options
,
624 struct security_mnt_opts
*opts
)
627 char *fsdefault
= NULL
;
628 char *fsfloor
= NULL
;
631 char *fstransmute
= NULL
;
633 int num_mnt_opts
= 0;
636 opts
->num_mnt_opts
= 0;
641 while ((p
= strsep(&options
, ",")) != NULL
) {
642 substring_t args
[MAX_OPT_ARGS
];
647 token
= match_token(p
, smk_mount_tokens
, args
);
653 fsdefault
= match_strdup(&args
[0]);
660 fsfloor
= match_strdup(&args
[0]);
667 fshat
= match_strdup(&args
[0]);
674 fsroot
= match_strdup(&args
[0]);
678 case Opt_fstransmute
:
681 fstransmute
= match_strdup(&args
[0]);
687 pr_warn("Smack: unknown mount option\n");
692 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_KERNEL
);
696 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
698 if (!opts
->mnt_opts_flags
) {
699 kfree(opts
->mnt_opts
);
704 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
705 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
708 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
709 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
712 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
713 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
716 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
717 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
720 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
721 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
724 opts
->num_mnt_opts
= num_mnt_opts
;
729 pr_warn("Smack: duplicate mount options\n");
741 * smack_set_mnt_opts - set Smack specific mount options
742 * @sb: the file system superblock
743 * @opts: Smack mount options
744 * @kern_flags: mount option from kernel space or user space
745 * @set_kern_flags: where to store converted mount opts
747 * Returns 0 on success, an error code on failure
749 * Allow filesystems with binary mount data to explicitly set Smack mount
752 static int smack_set_mnt_opts(struct super_block
*sb
,
753 struct security_mnt_opts
*opts
,
754 unsigned long kern_flags
,
755 unsigned long *set_kern_flags
)
757 struct dentry
*root
= sb
->s_root
;
758 struct inode
*inode
= d_backing_inode(root
);
759 struct superblock_smack
*sp
= sb
->s_security
;
760 struct inode_smack
*isp
;
761 struct smack_known
*skp
;
763 int num_opts
= opts
->num_mnt_opts
;
766 if (sp
->smk_flags
& SMK_SB_INITIALIZED
)
769 if (!smack_privileged(CAP_MAC_ADMIN
)) {
771 * Unprivileged mounts don't get to specify Smack values.
776 * Unprivileged mounts get root and default from the caller.
778 skp
= smk_of_current();
780 sp
->smk_default
= skp
;
782 * For a handful of fs types with no user-controlled
783 * backing store it's okay to trust security labels
784 * in the filesystem. The rest are untrusted.
786 if (sb
->s_user_ns
!= &init_user_ns
&&
787 sb
->s_magic
!= SYSFS_MAGIC
&& sb
->s_magic
!= TMPFS_MAGIC
&&
788 sb
->s_magic
!= RAMFS_MAGIC
) {
790 sp
->smk_flags
|= SMK_SB_UNTRUSTED
;
794 sp
->smk_flags
|= SMK_SB_INITIALIZED
;
796 for (i
= 0; i
< num_opts
; i
++) {
797 switch (opts
->mnt_opts_flags
[i
]) {
799 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
802 sp
->smk_default
= skp
;
805 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
811 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
817 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
823 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
835 * Initialize the root inode.
837 isp
= inode
->i_security
;
839 isp
= new_inode_smack(sp
->smk_root
);
842 inode
->i_security
= isp
;
844 isp
->smk_inode
= sp
->smk_root
;
847 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
853 * smack_sb_kern_mount - Smack specific mount processing
854 * @sb: the file system superblock
855 * @flags: the mount flags
856 * @data: the smack mount options
858 * Returns 0 on success, an error code on failure
860 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
863 char *options
= data
;
864 struct security_mnt_opts opts
;
866 security_init_mnt_opts(&opts
);
871 rc
= smack_parse_opts_str(options
, &opts
);
876 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
879 security_free_mnt_opts(&opts
);
884 * smack_sb_statfs - Smack check on statfs
885 * @dentry: identifies the file system in question
887 * Returns 0 if current can read the floor of the filesystem,
888 * and error code otherwise
890 static int smack_sb_statfs(struct dentry
*dentry
)
892 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
894 struct smk_audit_info ad
;
896 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
897 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
899 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
900 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
909 * smack_bprm_set_creds - set creds for exec
910 * @bprm: the exec information
912 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
914 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
916 struct inode
*inode
= file_inode(bprm
->file
);
917 struct task_smack
*bsp
= bprm
->cred
->security
;
918 struct inode_smack
*isp
;
919 struct superblock_smack
*sbsp
;
922 if (bprm
->cred_prepared
)
925 isp
= inode
->i_security
;
926 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
929 sbsp
= inode
->i_sb
->s_security
;
930 if ((sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) &&
931 isp
->smk_task
!= sbsp
->smk_root
)
934 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
935 struct task_struct
*tracer
;
939 tracer
= ptrace_parent(current
);
940 if (likely(tracer
!= NULL
))
941 rc
= smk_ptrace_rule_check(tracer
,
949 } else if (bprm
->unsafe
)
952 bsp
->smk_task
= isp
->smk_task
;
953 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
959 * smack_bprm_committing_creds - Prepare to install the new credentials
962 * @bprm: binprm for exec
964 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
966 struct task_smack
*bsp
= bprm
->cred
->security
;
968 if (bsp
->smk_task
!= bsp
->smk_forked
)
969 current
->pdeath_signal
= 0;
973 * smack_bprm_secureexec - Return the decision to use secureexec.
974 * @bprm: binprm for exec
976 * Returns 0 on success.
978 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
980 struct task_smack
*tsp
= current_security();
982 if (tsp
->smk_task
!= tsp
->smk_forked
)
993 * smack_inode_alloc_security - allocate an inode blob
994 * @inode: the inode in need of a blob
996 * Returns 0 if it gets a blob, -ENOMEM otherwise
998 static int smack_inode_alloc_security(struct inode
*inode
)
1000 struct smack_known
*skp
= smk_of_current();
1002 inode
->i_security
= new_inode_smack(skp
);
1003 if (inode
->i_security
== NULL
)
1009 * smack_inode_free_rcu - Free inode_smack blob from cache
1010 * @head: the rcu_head for getting inode_smack pointer
1012 * Call back function called from call_rcu() to free
1013 * the i_security blob pointer in inode
1015 static void smack_inode_free_rcu(struct rcu_head
*head
)
1017 struct inode_smack
*issp
;
1019 issp
= container_of(head
, struct inode_smack
, smk_rcu
);
1020 kmem_cache_free(smack_inode_cache
, issp
);
1024 * smack_inode_free_security - free an inode blob using call_rcu()
1025 * @inode: the inode with a blob
1027 * Clears the blob pointer in inode using RCU
1029 static void smack_inode_free_security(struct inode
*inode
)
1031 struct inode_smack
*issp
= inode
->i_security
;
1034 * The inode may still be referenced in a path walk and
1035 * a call to smack_inode_permission() can be made
1036 * after smack_inode_free_security() is called.
1037 * To avoid race condition free the i_security via RCU
1038 * and leave the current inode->i_security pointer intact.
1039 * The inode will be freed after the RCU grace period too.
1041 call_rcu(&issp
->smk_rcu
, smack_inode_free_rcu
);
1045 * smack_inode_init_security - copy out the smack from an inode
1046 * @inode: the newly created inode
1047 * @dir: containing directory object
1049 * @name: where to put the attribute name
1050 * @value: where to put the attribute value
1051 * @len: where to put the length of the attribute
1053 * Returns 0 if it all works out, -ENOMEM if there's no memory
1055 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
1056 const struct qstr
*qstr
, const char **name
,
1057 void **value
, size_t *len
)
1059 struct inode_smack
*issp
= inode
->i_security
;
1060 struct smack_known
*skp
= smk_of_current();
1061 struct smack_known
*isp
= smk_of_inode(inode
);
1062 struct smack_known
*dsp
= smk_of_inode(dir
);
1066 *name
= XATTR_SMACK_SUFFIX
;
1070 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1075 * If the access rule allows transmutation and
1076 * the directory requests transmutation then
1077 * by all means transmute.
1078 * Mark the inode as changed.
1080 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1081 smk_inode_transmutable(dir
)) {
1083 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1086 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1090 *len
= strlen(isp
->smk_known
);
1097 * smack_inode_link - Smack check on link
1098 * @old_dentry: the existing object
1100 * @new_dentry: the new object
1102 * Returns 0 if access is permitted, an error code otherwise
1104 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1105 struct dentry
*new_dentry
)
1107 struct smack_known
*isp
;
1108 struct smk_audit_info ad
;
1111 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1112 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1114 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1115 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1116 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1118 if (rc
== 0 && d_is_positive(new_dentry
)) {
1119 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1120 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1121 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1122 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1129 * smack_inode_unlink - Smack check on inode deletion
1130 * @dir: containing directory object
1131 * @dentry: file to unlink
1133 * Returns 0 if current can write the containing directory
1134 * and the object, error code otherwise
1136 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1138 struct inode
*ip
= d_backing_inode(dentry
);
1139 struct smk_audit_info ad
;
1142 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1143 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1146 * You need write access to the thing you're unlinking
1148 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1149 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1152 * You also need write access to the containing directory
1154 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1155 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1156 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1157 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1163 * smack_inode_rmdir - Smack check on directory deletion
1164 * @dir: containing directory object
1165 * @dentry: directory to unlink
1167 * Returns 0 if current can write the containing directory
1168 * and the directory, error code otherwise
1170 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1172 struct smk_audit_info ad
;
1175 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1176 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1179 * You need write access to the thing you're removing
1181 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1182 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1185 * You also need write access to the containing directory
1187 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1188 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1189 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1190 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1197 * smack_inode_rename - Smack check on rename
1198 * @old_inode: unused
1199 * @old_dentry: the old object
1200 * @new_inode: unused
1201 * @new_dentry: the new object
1203 * Read and write access is required on both the old and
1206 * Returns 0 if access is permitted, an error code otherwise
1208 static int smack_inode_rename(struct inode
*old_inode
,
1209 struct dentry
*old_dentry
,
1210 struct inode
*new_inode
,
1211 struct dentry
*new_dentry
)
1214 struct smack_known
*isp
;
1215 struct smk_audit_info ad
;
1217 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1218 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1220 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1221 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1222 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1224 if (rc
== 0 && d_is_positive(new_dentry
)) {
1225 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1226 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1227 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1228 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1234 * smack_inode_permission - Smack version of permission()
1235 * @inode: the inode in question
1236 * @mask: the access requested
1238 * This is the important Smack hook.
1240 * Returns 0 if access is permitted, -EACCES otherwise
1242 static int smack_inode_permission(struct inode
*inode
, int mask
)
1244 struct superblock_smack
*sbsp
= inode
->i_sb
->s_security
;
1245 struct smk_audit_info ad
;
1246 int no_block
= mask
& MAY_NOT_BLOCK
;
1249 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1251 * No permission to check. Existence test. Yup, it's there.
1256 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) {
1257 if (smk_of_inode(inode
) != sbsp
->smk_root
)
1261 /* May be droppable after audit */
1264 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1265 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1266 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1267 rc
= smk_bu_inode(inode
, mask
, rc
);
1272 * smack_inode_setattr - Smack check for setting attributes
1273 * @dentry: the object
1274 * @iattr: for the force flag
1276 * Returns 0 if access is permitted, an error code otherwise
1278 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1280 struct smk_audit_info ad
;
1284 * Need to allow for clearing the setuid bit.
1286 if (iattr
->ia_valid
& ATTR_FORCE
)
1288 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1289 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1291 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1292 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1297 * smack_inode_getattr - Smack check for getting attributes
1298 * @mnt: vfsmount of the object
1299 * @dentry: the object
1301 * Returns 0 if access is permitted, an error code otherwise
1303 static int smack_inode_getattr(const struct path
*path
)
1305 struct smk_audit_info ad
;
1306 struct inode
*inode
= d_backing_inode(path
->dentry
);
1309 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1310 smk_ad_setfield_u_fs_path(&ad
, *path
);
1311 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1312 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1317 * smack_inode_setxattr - Smack check for setting xattrs
1318 * @dentry: the object
1319 * @name: name of the attribute
1320 * @value: value of the attribute
1321 * @size: size of the value
1324 * This protects the Smack attribute explicitly.
1326 * Returns 0 if access is permitted, an error code otherwise
1328 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1329 const void *value
, size_t size
, int flags
)
1331 struct smk_audit_info ad
;
1332 struct smack_known
*skp
;
1334 int check_import
= 0;
1339 * Check label validity here so import won't fail in post_setxattr
1341 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1342 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1343 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1346 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1347 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1351 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1353 if (size
!= TRANS_TRUE_SIZE
||
1354 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1357 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1359 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1362 if (rc
== 0 && check_import
) {
1363 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1366 else if (skp
== NULL
|| (check_star
&&
1367 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1371 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1372 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1375 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1376 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1383 * smack_inode_post_setxattr - Apply the Smack update approved above
1385 * @name: attribute name
1386 * @value: attribute value
1387 * @size: attribute size
1390 * Set the pointer in the inode blob to the entry found
1391 * in the master label list.
1393 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1394 const void *value
, size_t size
, int flags
)
1396 struct smack_known
*skp
;
1397 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1399 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1400 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1404 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1405 skp
= smk_import_entry(value
, size
);
1407 isp
->smk_inode
= skp
;
1408 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1409 skp
= smk_import_entry(value
, size
);
1411 isp
->smk_task
= skp
;
1412 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1413 skp
= smk_import_entry(value
, size
);
1415 isp
->smk_mmap
= skp
;
1422 * smack_inode_getxattr - Smack check on getxattr
1423 * @dentry: the object
1426 * Returns 0 if access is permitted, an error code otherwise
1428 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1430 struct smk_audit_info ad
;
1433 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1434 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1436 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1437 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1442 * smack_inode_removexattr - Smack check on removexattr
1443 * @dentry: the object
1444 * @name: name of the attribute
1446 * Removing the Smack attribute requires CAP_MAC_ADMIN
1448 * Returns 0 if access is permitted, an error code otherwise
1450 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1452 struct inode_smack
*isp
;
1453 struct smk_audit_info ad
;
1456 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1457 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1458 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1459 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1460 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1461 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1462 if (!smack_privileged(CAP_MAC_ADMIN
))
1465 rc
= cap_inode_removexattr(dentry
, name
);
1470 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1471 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1473 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1474 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1478 isp
= d_backing_inode(dentry
)->i_security
;
1480 * Don't do anything special for these.
1481 * XATTR_NAME_SMACKIPIN
1482 * XATTR_NAME_SMACKIPOUT
1484 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1485 struct super_block
*sbp
= dentry
->d_sb
;
1486 struct superblock_smack
*sbsp
= sbp
->s_security
;
1488 isp
->smk_inode
= sbsp
->smk_default
;
1489 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0)
1490 isp
->smk_task
= NULL
;
1491 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1492 isp
->smk_mmap
= NULL
;
1493 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1494 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1500 * smack_inode_getsecurity - get smack xattrs
1501 * @inode: the object
1502 * @name: attribute name
1503 * @buffer: where to put the result
1506 * Returns the size of the attribute or an error code
1508 static int smack_inode_getsecurity(struct inode
*inode
,
1509 const char *name
, void **buffer
,
1512 struct socket_smack
*ssp
;
1513 struct socket
*sock
;
1514 struct super_block
*sbp
;
1515 struct inode
*ip
= (struct inode
*)inode
;
1516 struct smack_known
*isp
;
1520 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1521 isp
= smk_of_inode(inode
);
1522 ilen
= strlen(isp
->smk_known
);
1523 *buffer
= isp
->smk_known
;
1528 * The rest of the Smack xattrs are only on sockets.
1531 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1534 sock
= SOCKET_I(ip
);
1535 if (sock
== NULL
|| sock
->sk
== NULL
)
1538 ssp
= sock
->sk
->sk_security
;
1540 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1542 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1547 ilen
= strlen(isp
->smk_known
);
1549 *buffer
= isp
->smk_known
;
1558 * smack_inode_listsecurity - list the Smack attributes
1559 * @inode: the object
1560 * @buffer: where they go
1561 * @buffer_size: size of buffer
1563 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1566 int len
= sizeof(XATTR_NAME_SMACK
);
1568 if (buffer
!= NULL
&& len
<= buffer_size
)
1569 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1575 * smack_inode_getsecid - Extract inode's security id
1576 * @inode: inode to extract the info from
1577 * @secid: where result will be saved
1579 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1581 struct inode_smack
*isp
= inode
->i_security
;
1583 *secid
= isp
->smk_inode
->smk_secid
;
1591 * There is no smack_file_permission hook
1593 * Should access checks be done on each read or write?
1594 * UNICOS and SELinux say yes.
1595 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1597 * I'll say no for now. Smack does not do the frequent
1598 * label changing that SELinux does.
1602 * smack_file_alloc_security - assign a file security blob
1605 * The security blob for a file is a pointer to the master
1606 * label list, so no allocation is done.
1608 * f_security is the owner security information. It
1609 * isn't used on file access checks, it's for send_sigio.
1613 static int smack_file_alloc_security(struct file
*file
)
1615 struct smack_known
*skp
= smk_of_current();
1617 file
->f_security
= skp
;
1622 * smack_file_free_security - clear a file security blob
1625 * The security blob for a file is a pointer to the master
1626 * label list, so no memory is freed.
1628 static void smack_file_free_security(struct file
*file
)
1630 file
->f_security
= NULL
;
1634 * smack_file_ioctl - Smack check on ioctls
1639 * Relies heavily on the correct use of the ioctl command conventions.
1641 * Returns 0 if allowed, error code otherwise
1643 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1647 struct smk_audit_info ad
;
1648 struct inode
*inode
= file_inode(file
);
1650 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1651 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1653 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1654 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1655 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1658 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1659 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1660 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1667 * smack_file_lock - Smack check on file locking
1671 * Returns 0 if current has lock access, error code otherwise
1673 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1675 struct smk_audit_info ad
;
1677 struct inode
*inode
= file_inode(file
);
1679 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1680 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1681 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1682 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1687 * smack_file_fcntl - Smack check on fcntl
1689 * @cmd: what action to check
1692 * Generally these operations are harmless.
1693 * File locking operations present an obvious mechanism
1694 * for passing information, so they require write access.
1696 * Returns 0 if current has access, error code otherwise
1698 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1701 struct smk_audit_info ad
;
1703 struct inode
*inode
= file_inode(file
);
1710 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1711 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1712 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1713 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1717 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1718 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1719 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1720 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1731 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1732 * if mapping anonymous memory.
1733 * @file contains the file structure for file to map (may be NULL).
1734 * @reqprot contains the protection requested by the application.
1735 * @prot contains the protection that will be applied by the kernel.
1736 * @flags contains the operational flags.
1737 * Return 0 if permission is granted.
1739 static int smack_mmap_file(struct file
*file
,
1740 unsigned long reqprot
, unsigned long prot
,
1741 unsigned long flags
)
1743 struct smack_known
*skp
;
1744 struct smack_known
*mkp
;
1745 struct smack_rule
*srp
;
1746 struct task_smack
*tsp
;
1747 struct smack_known
*okp
;
1748 struct inode_smack
*isp
;
1749 struct superblock_smack
*sbsp
;
1758 isp
= file_inode(file
)->i_security
;
1759 if (isp
->smk_mmap
== NULL
)
1761 sbsp
= file_inode(file
)->i_sb
->s_security
;
1762 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
&&
1763 isp
->smk_mmap
!= sbsp
->smk_root
)
1765 mkp
= isp
->smk_mmap
;
1767 tsp
= current_security();
1768 skp
= smk_of_current();
1773 * For each Smack rule associated with the subject
1774 * label verify that the SMACK64MMAP also has access
1775 * to that rule's object label.
1777 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1778 okp
= srp
->smk_object
;
1780 * Matching labels always allows access.
1782 if (mkp
->smk_known
== okp
->smk_known
)
1785 * If there is a matching local rule take
1786 * that into account as well.
1788 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1792 may
= srp
->smk_access
;
1794 may
&= srp
->smk_access
;
1796 * If may is zero the SMACK64MMAP subject can't
1797 * possibly have less access.
1803 * Fetch the global list entry.
1804 * If there isn't one a SMACK64MMAP subject
1805 * can't have as much access as current.
1807 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1809 if (mmay
== -ENOENT
) {
1814 * If there is a local entry it modifies the
1815 * potential access, too.
1817 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1819 if (tmay
!= -ENOENT
)
1823 * If there is any access available to current that is
1824 * not available to a SMACK64MMAP subject
1827 if ((may
| mmay
) != mmay
) {
1839 * smack_file_set_fowner - set the file security blob value
1840 * @file: object in question
1843 static void smack_file_set_fowner(struct file
*file
)
1845 file
->f_security
= smk_of_current();
1849 * smack_file_send_sigiotask - Smack on sigio
1850 * @tsk: The target task
1851 * @fown: the object the signal come from
1854 * Allow a privileged task to get signals even if it shouldn't
1856 * Returns 0 if a subject with the object's smack could
1857 * write to the task, an error code otherwise.
1859 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1860 struct fown_struct
*fown
, int signum
)
1862 struct smack_known
*skp
;
1863 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1866 struct smk_audit_info ad
;
1869 * struct fown_struct is never outside the context of a struct file
1871 file
= container_of(fown
, struct file
, f_owner
);
1873 /* we don't log here as rc can be overriden */
1874 skp
= file
->f_security
;
1875 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, NULL
);
1876 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_DELIVER
, rc
);
1877 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1880 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1881 smk_ad_setfield_u_tsk(&ad
, tsk
);
1882 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_DELIVER
, rc
, &ad
);
1887 * smack_file_receive - Smack file receive check
1890 * Returns 0 if current has access, error code otherwise
1892 static int smack_file_receive(struct file
*file
)
1896 struct smk_audit_info ad
;
1897 struct inode
*inode
= file_inode(file
);
1898 struct socket
*sock
;
1899 struct task_smack
*tsp
;
1900 struct socket_smack
*ssp
;
1902 if (unlikely(IS_PRIVATE(inode
)))
1905 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1906 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1908 if (S_ISSOCK(inode
->i_mode
)) {
1909 sock
= SOCKET_I(inode
);
1910 ssp
= sock
->sk
->sk_security
;
1911 tsp
= current_security();
1913 * If the receiving process can't write to the
1914 * passed socket or if the passed socket can't
1915 * write to the receiving process don't accept
1916 * the passed socket.
1918 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1919 rc
= smk_bu_file(file
, may
, rc
);
1922 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1923 rc
= smk_bu_file(file
, may
, rc
);
1927 * This code relies on bitmasks.
1929 if (file
->f_mode
& FMODE_READ
)
1931 if (file
->f_mode
& FMODE_WRITE
)
1934 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1935 rc
= smk_bu_file(file
, may
, rc
);
1940 * smack_file_open - Smack dentry open processing
1942 * @cred: task credential
1944 * Set the security blob in the file structure.
1945 * Allow the open only if the task has read access. There are
1946 * many read operations (e.g. fstat) that you can do with an
1947 * fd even if you have the file open write-only.
1951 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1953 struct task_smack
*tsp
= cred
->security
;
1954 struct inode
*inode
= file_inode(file
);
1955 struct smk_audit_info ad
;
1958 if (smack_privileged(CAP_MAC_OVERRIDE
))
1961 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1962 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1963 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1964 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1974 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1975 * @new: the new credentials
1976 * @gfp: the atomicity of any memory allocations
1978 * Prepare a blank set of credentials for modification. This must allocate all
1979 * the memory the LSM module might require such that cred_transfer() can
1980 * complete without error.
1982 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1984 struct task_smack
*tsp
;
1986 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1990 cred
->security
= tsp
;
1997 * smack_cred_free - "free" task-level security credentials
1998 * @cred: the credentials in question
2001 static void smack_cred_free(struct cred
*cred
)
2003 struct task_smack
*tsp
= cred
->security
;
2004 struct smack_rule
*rp
;
2005 struct list_head
*l
;
2006 struct list_head
*n
;
2010 cred
->security
= NULL
;
2012 smk_destroy_label_list(&tsp
->smk_relabel
);
2014 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
2015 rp
= list_entry(l
, struct smack_rule
, list
);
2016 list_del(&rp
->list
);
2023 * smack_cred_prepare - prepare new set of credentials for modification
2024 * @new: the new credentials
2025 * @old: the original credentials
2026 * @gfp: the atomicity of any memory allocations
2028 * Prepare a new set of credentials for modification.
2030 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
2033 struct task_smack
*old_tsp
= old
->security
;
2034 struct task_smack
*new_tsp
;
2037 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
2038 if (new_tsp
== NULL
)
2041 new->security
= new_tsp
;
2043 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
2047 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
2056 * smack_cred_transfer - Transfer the old credentials to the new credentials
2057 * @new: the new credentials
2058 * @old: the original credentials
2060 * Fill in a set of blank credentials from another set of credentials.
2062 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
2064 struct task_smack
*old_tsp
= old
->security
;
2065 struct task_smack
*new_tsp
= new->security
;
2067 new_tsp
->smk_task
= old_tsp
->smk_task
;
2068 new_tsp
->smk_forked
= old_tsp
->smk_task
;
2069 mutex_init(&new_tsp
->smk_rules_lock
);
2070 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
2073 /* cbs copy rule list */
2077 * smack_kernel_act_as - Set the subjective context in a set of credentials
2078 * @new: points to the set of credentials to be modified.
2079 * @secid: specifies the security ID to be set
2081 * Set the security data for a kernel service.
2083 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
2085 struct task_smack
*new_tsp
= new->security
;
2087 new_tsp
->smk_task
= smack_from_secid(secid
);
2092 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2093 * @new: points to the set of credentials to be modified
2094 * @inode: points to the inode to use as a reference
2096 * Set the file creation context in a set of credentials to the same
2097 * as the objective context of the specified inode
2099 static int smack_kernel_create_files_as(struct cred
*new,
2100 struct inode
*inode
)
2102 struct inode_smack
*isp
= inode
->i_security
;
2103 struct task_smack
*tsp
= new->security
;
2105 tsp
->smk_forked
= isp
->smk_inode
;
2106 tsp
->smk_task
= tsp
->smk_forked
;
2111 * smk_curacc_on_task - helper to log task related access
2112 * @p: the task object
2113 * @access: the access requested
2114 * @caller: name of the calling function for audit
2116 * Return 0 if access is permitted
2118 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2121 struct smk_audit_info ad
;
2122 struct smack_known
*skp
= smk_of_task_struct(p
);
2125 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2126 smk_ad_setfield_u_tsk(&ad
, p
);
2127 rc
= smk_curacc(skp
, access
, &ad
);
2128 rc
= smk_bu_task(p
, access
, rc
);
2133 * smack_task_setpgid - Smack check on setting pgid
2134 * @p: the task object
2137 * Return 0 if write access is permitted
2139 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2141 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2145 * smack_task_getpgid - Smack access check for getpgid
2146 * @p: the object task
2148 * Returns 0 if current can read the object task, error code otherwise
2150 static int smack_task_getpgid(struct task_struct
*p
)
2152 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2156 * smack_task_getsid - Smack access check for getsid
2157 * @p: the object task
2159 * Returns 0 if current can read the object task, error code otherwise
2161 static int smack_task_getsid(struct task_struct
*p
)
2163 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2167 * smack_task_getsecid - get the secid of the task
2168 * @p: the object task
2169 * @secid: where to put the result
2171 * Sets the secid to contain a u32 version of the smack label.
2173 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2175 struct smack_known
*skp
= smk_of_task_struct(p
);
2177 *secid
= skp
->smk_secid
;
2181 * smack_task_setnice - Smack check on setting nice
2182 * @p: the task object
2185 * Return 0 if write access is permitted
2187 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2189 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2193 * smack_task_setioprio - Smack check on setting ioprio
2194 * @p: the task object
2197 * Return 0 if write access is permitted
2199 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2201 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2205 * smack_task_getioprio - Smack check on reading ioprio
2206 * @p: the task object
2208 * Return 0 if read access is permitted
2210 static int smack_task_getioprio(struct task_struct
*p
)
2212 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2216 * smack_task_setscheduler - Smack check on setting scheduler
2217 * @p: the task object
2221 * Return 0 if read access is permitted
2223 static int smack_task_setscheduler(struct task_struct
*p
)
2225 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2229 * smack_task_getscheduler - Smack check on reading scheduler
2230 * @p: the task object
2232 * Return 0 if read access is permitted
2234 static int smack_task_getscheduler(struct task_struct
*p
)
2236 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2240 * smack_task_movememory - Smack check on moving memory
2241 * @p: the task object
2243 * Return 0 if write access is permitted
2245 static int smack_task_movememory(struct task_struct
*p
)
2247 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2251 * smack_task_kill - Smack check on signal delivery
2252 * @p: the task object
2255 * @secid: identifies the smack to use in lieu of current's
2257 * Return 0 if write access is permitted
2259 * The secid behavior is an artifact of an SELinux hack
2260 * in the USB code. Someday it may go away.
2262 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2265 struct smk_audit_info ad
;
2266 struct smack_known
*skp
;
2267 struct smack_known
*tkp
= smk_of_task_struct(p
);
2271 return 0; /* null signal; existence test */
2273 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2274 smk_ad_setfield_u_tsk(&ad
, p
);
2276 * Sending a signal requires that the sender
2277 * can write the receiver.
2280 rc
= smk_curacc(tkp
, MAY_DELIVER
, &ad
);
2281 rc
= smk_bu_task(p
, MAY_DELIVER
, rc
);
2285 * If the secid isn't 0 we're dealing with some USB IO
2286 * specific behavior. This is not clean. For one thing
2287 * we can't take privilege into account.
2289 skp
= smack_from_secid(secid
);
2290 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, &ad
);
2291 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_DELIVER
, rc
);
2296 * smack_task_wait - Smack access check for waiting
2297 * @p: task to wait for
2301 static int smack_task_wait(struct task_struct
*p
)
2304 * Allow the operation to succeed.
2306 * In userless environments (e.g. phones) programs
2307 * get marked with SMACK64EXEC and even if the parent
2308 * and child shouldn't be talking the parent still
2309 * may expect to know when the child exits.
2315 * smack_task_to_inode - copy task smack into the inode blob
2316 * @p: task to copy from
2317 * @inode: inode to copy to
2319 * Sets the smack pointer in the inode security blob
2321 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2323 struct inode_smack
*isp
= inode
->i_security
;
2324 struct smack_known
*skp
= smk_of_task_struct(p
);
2326 isp
->smk_inode
= skp
;
2334 * smack_sk_alloc_security - Allocate a socket blob
2337 * @gfp_flags: memory allocation flags
2339 * Assign Smack pointers to current
2341 * Returns 0 on success, -ENOMEM is there's no memory
2343 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2345 struct smack_known
*skp
= smk_of_current();
2346 struct socket_smack
*ssp
;
2348 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2353 * Sockets created by kernel threads receive web label.
2355 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2356 ssp
->smk_in
= &smack_known_web
;
2357 ssp
->smk_out
= &smack_known_web
;
2362 ssp
->smk_packet
= NULL
;
2364 sk
->sk_security
= ssp
;
2370 * smack_sk_free_security - Free a socket blob
2373 * Clears the blob pointer
2375 static void smack_sk_free_security(struct sock
*sk
)
2377 #ifdef SMACK_IPV6_PORT_LABELING
2378 struct smk_port_label
*spp
;
2380 if (sk
->sk_family
== PF_INET6
) {
2382 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2383 if (spp
->smk_sock
!= sk
)
2385 spp
->smk_can_reuse
= 1;
2391 kfree(sk
->sk_security
);
2395 * smack_ipv4host_label - check host based restrictions
2396 * @sip: the object end
2398 * looks for host based access restrictions
2400 * This version will only be appropriate for really small sets of single label
2401 * hosts. The caller is responsible for ensuring that the RCU read lock is
2402 * taken before calling this function.
2404 * Returns the label of the far end or NULL if it's not special.
2406 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2408 struct smk_net4addr
*snp
;
2409 struct in_addr
*siap
= &sip
->sin_addr
;
2411 if (siap
->s_addr
== 0)
2414 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2416 * we break after finding the first match because
2417 * the list is sorted from longest to shortest mask
2418 * so we have found the most specific match
2420 if (snp
->smk_host
.s_addr
==
2421 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2422 return snp
->smk_label
;
2427 #if IS_ENABLED(CONFIG_IPV6)
2429 * smk_ipv6_localhost - Check for local ipv6 host address
2432 * Returns boolean true if this is the localhost address
2434 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2436 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2437 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2439 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2440 ntohs(be16p
[7]) == 1)
2446 * smack_ipv6host_label - check host based restrictions
2447 * @sip: the object end
2449 * looks for host based access restrictions
2451 * This version will only be appropriate for really small sets of single label
2452 * hosts. The caller is responsible for ensuring that the RCU read lock is
2453 * taken before calling this function.
2455 * Returns the label of the far end or NULL if it's not special.
2457 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2459 struct smk_net6addr
*snp
;
2460 struct in6_addr
*sap
= &sip
->sin6_addr
;
2465 * It's local. Don't look for a host label.
2467 if (smk_ipv6_localhost(sip
))
2470 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2472 * If the label is NULL the entry has
2473 * been renounced. Ignore it.
2475 if (snp
->smk_label
== NULL
)
2478 * we break after finding the first match because
2479 * the list is sorted from longest to shortest mask
2480 * so we have found the most specific match
2482 for (found
= 1, i
= 0; i
< 8; i
++) {
2483 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2484 snp
->smk_host
.s6_addr16
[i
]) {
2490 return snp
->smk_label
;
2495 #endif /* CONFIG_IPV6 */
2498 * smack_netlabel - Set the secattr on a socket
2500 * @labeled: socket label scheme
2502 * Convert the outbound smack value (smk_out) to a
2503 * secattr and attach it to the socket.
2505 * Returns 0 on success or an error code
2507 static int smack_netlabel(struct sock
*sk
, int labeled
)
2509 struct smack_known
*skp
;
2510 struct socket_smack
*ssp
= sk
->sk_security
;
2514 * Usually the netlabel code will handle changing the
2515 * packet labeling based on the label.
2516 * The case of a single label host is different, because
2517 * a single label host should never get a labeled packet
2518 * even though the label is usually associated with a packet
2522 bh_lock_sock_nested(sk
);
2524 if (ssp
->smk_out
== smack_net_ambient
||
2525 labeled
== SMACK_UNLABELED_SOCKET
)
2526 netlbl_sock_delattr(sk
);
2529 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2539 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2541 * @sap: the destination address
2543 * Set the correct secattr for the given socket based on the destination
2544 * address and perform any outbound access checks needed.
2546 * Returns 0 on success or an error code.
2549 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2551 struct smack_known
*skp
;
2554 struct smack_known
*hkp
;
2555 struct socket_smack
*ssp
= sk
->sk_security
;
2556 struct smk_audit_info ad
;
2559 hkp
= smack_ipv4host_label(sap
);
2562 struct lsm_network_audit net
;
2564 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2565 ad
.a
.u
.net
->family
= sap
->sin_family
;
2566 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2567 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2569 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2571 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2572 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2574 sk_lbl
= SMACK_CIPSO_SOCKET
;
2581 return smack_netlabel(sk
, sk_lbl
);
2584 #if IS_ENABLED(CONFIG_IPV6)
2586 * smk_ipv6_check - check Smack access
2587 * @subject: subject Smack label
2588 * @object: object Smack label
2590 * @act: the action being taken
2592 * Check an IPv6 access
2594 static int smk_ipv6_check(struct smack_known
*subject
,
2595 struct smack_known
*object
,
2596 struct sockaddr_in6
*address
, int act
)
2599 struct lsm_network_audit net
;
2601 struct smk_audit_info ad
;
2605 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2606 ad
.a
.u
.net
->family
= PF_INET6
;
2607 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2608 if (act
== SMK_RECEIVING
)
2609 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2611 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2613 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2614 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2617 #endif /* CONFIG_IPV6 */
2619 #ifdef SMACK_IPV6_PORT_LABELING
2621 * smk_ipv6_port_label - Smack port access table management
2625 * Create or update the port list entry
2627 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2629 struct sock
*sk
= sock
->sk
;
2630 struct sockaddr_in6
*addr6
;
2631 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2632 struct smk_port_label
*spp
;
2633 unsigned short port
= 0;
2635 if (address
== NULL
) {
2637 * This operation is changing the Smack information
2638 * on the bound socket. Take the changes to the port
2642 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2643 if (sk
!= spp
->smk_sock
)
2645 spp
->smk_in
= ssp
->smk_in
;
2646 spp
->smk_out
= ssp
->smk_out
;
2651 * A NULL address is only used for updating existing
2652 * bound entries. If there isn't one, it's OK.
2658 addr6
= (struct sockaddr_in6
*)address
;
2659 port
= ntohs(addr6
->sin6_port
);
2661 * This is a special case that is safely ignored.
2667 * Look for an existing port list entry.
2668 * This is an indication that a port is getting reused.
2671 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2672 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sock
->type
)
2674 if (spp
->smk_can_reuse
!= 1) {
2678 spp
->smk_port
= port
;
2680 spp
->smk_in
= ssp
->smk_in
;
2681 spp
->smk_out
= ssp
->smk_out
;
2682 spp
->smk_can_reuse
= 0;
2688 * A new port entry is required.
2690 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2694 spp
->smk_port
= port
;
2696 spp
->smk_in
= ssp
->smk_in
;
2697 spp
->smk_out
= ssp
->smk_out
;
2698 spp
->smk_sock_type
= sock
->type
;
2699 spp
->smk_can_reuse
= 0;
2701 mutex_lock(&smack_ipv6_lock
);
2702 list_add_rcu(&spp
->list
, &smk_ipv6_port_list
);
2703 mutex_unlock(&smack_ipv6_lock
);
2708 * smk_ipv6_port_check - check Smack port access
2712 * Create or update the port list entry
2714 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2717 struct smk_port_label
*spp
;
2718 struct socket_smack
*ssp
= sk
->sk_security
;
2719 struct smack_known
*skp
= NULL
;
2720 unsigned short port
;
2721 struct smack_known
*object
;
2723 if (act
== SMK_RECEIVING
) {
2724 skp
= smack_ipv6host_label(address
);
2725 object
= ssp
->smk_in
;
2728 object
= smack_ipv6host_label(address
);
2732 * The other end is a single label host.
2734 if (skp
!= NULL
&& object
!= NULL
)
2735 return smk_ipv6_check(skp
, object
, address
, act
);
2737 skp
= smack_net_ambient
;
2739 object
= smack_net_ambient
;
2742 * It's remote, so port lookup does no good.
2744 if (!smk_ipv6_localhost(address
))
2745 return smk_ipv6_check(skp
, object
, address
, act
);
2748 * It's local so the send check has to have passed.
2750 if (act
== SMK_RECEIVING
)
2753 port
= ntohs(address
->sin6_port
);
2755 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2756 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sk
->sk_type
)
2758 object
= spp
->smk_in
;
2759 if (act
== SMK_CONNECTING
)
2760 ssp
->smk_packet
= spp
->smk_out
;
2765 return smk_ipv6_check(skp
, object
, address
, act
);
2767 #endif /* SMACK_IPV6_PORT_LABELING */
2770 * smack_inode_setsecurity - set smack xattrs
2771 * @inode: the object
2772 * @name: attribute name
2773 * @value: attribute value
2774 * @size: size of the attribute
2777 * Sets the named attribute in the appropriate blob
2779 * Returns 0 on success, or an error code
2781 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2782 const void *value
, size_t size
, int flags
)
2784 struct smack_known
*skp
;
2785 struct inode_smack
*nsp
= inode
->i_security
;
2786 struct socket_smack
*ssp
;
2787 struct socket
*sock
;
2790 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2793 skp
= smk_import_entry(value
, size
);
2795 return PTR_ERR(skp
);
2797 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2798 nsp
->smk_inode
= skp
;
2799 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2803 * The rest of the Smack xattrs are only on sockets.
2805 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2808 sock
= SOCKET_I(inode
);
2809 if (sock
== NULL
|| sock
->sk
== NULL
)
2812 ssp
= sock
->sk
->sk_security
;
2814 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2816 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2818 if (sock
->sk
->sk_family
== PF_INET
) {
2819 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2822 "Smack: \"%s\" netlbl error %d.\n",
2828 #ifdef SMACK_IPV6_PORT_LABELING
2829 if (sock
->sk
->sk_family
== PF_INET6
)
2830 smk_ipv6_port_label(sock
, NULL
);
2837 * smack_socket_post_create - finish socket setup
2839 * @family: protocol family
2844 * Sets the netlabel information on the socket
2846 * Returns 0 on success, and error code otherwise
2848 static int smack_socket_post_create(struct socket
*sock
, int family
,
2849 int type
, int protocol
, int kern
)
2851 struct socket_smack
*ssp
;
2853 if (sock
->sk
== NULL
)
2857 * Sockets created by kernel threads receive web label.
2859 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2860 ssp
= sock
->sk
->sk_security
;
2861 ssp
->smk_in
= &smack_known_web
;
2862 ssp
->smk_out
= &smack_known_web
;
2865 if (family
!= PF_INET
)
2868 * Set the outbound netlbl.
2870 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2873 #ifdef SMACK_IPV6_PORT_LABELING
2875 * smack_socket_bind - record port binding information.
2877 * @address: the port address
2878 * @addrlen: size of the address
2880 * Records the label bound to a port.
2884 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2887 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2888 smk_ipv6_port_label(sock
, address
);
2891 #endif /* SMACK_IPV6_PORT_LABELING */
2894 * smack_socket_connect - connect access check
2896 * @sap: the other end
2897 * @addrlen: size of sap
2899 * Verifies that a connection may be possible
2901 * Returns 0 on success, and error code otherwise
2903 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2907 #if IS_ENABLED(CONFIG_IPV6)
2908 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2910 #ifdef SMACK_IPV6_SECMARK_LABELING
2911 struct smack_known
*rsp
;
2912 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2915 if (sock
->sk
== NULL
)
2918 switch (sock
->sk
->sk_family
) {
2920 if (addrlen
< sizeof(struct sockaddr_in
))
2922 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2925 if (addrlen
< sizeof(struct sockaddr_in6
))
2927 #ifdef SMACK_IPV6_SECMARK_LABELING
2928 rsp
= smack_ipv6host_label(sip
);
2930 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2933 #ifdef SMACK_IPV6_PORT_LABELING
2934 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2942 * smack_flags_to_may - convert S_ to MAY_ values
2943 * @flags: the S_ value
2945 * Returns the equivalent MAY_ value
2947 static int smack_flags_to_may(int flags
)
2951 if (flags
& S_IRUGO
)
2953 if (flags
& S_IWUGO
)
2955 if (flags
& S_IXUGO
)
2962 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2967 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2969 struct smack_known
*skp
= smk_of_current();
2971 msg
->security
= skp
;
2976 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2979 * Clears the blob pointer
2981 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2983 msg
->security
= NULL
;
2987 * smack_of_shm - the smack pointer for the shm
2990 * Returns a pointer to the smack value
2992 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2994 return (struct smack_known
*)shp
->shm_perm
.security
;
2998 * smack_shm_alloc_security - Set the security blob for shm
3003 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
3005 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
3006 struct smack_known
*skp
= smk_of_current();
3008 isp
->security
= skp
;
3013 * smack_shm_free_security - Clear the security blob for shm
3016 * Clears the blob pointer
3018 static void smack_shm_free_security(struct shmid_kernel
*shp
)
3020 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
3022 isp
->security
= NULL
;
3026 * smk_curacc_shm : check if current has access on shm
3028 * @access : access requested
3030 * Returns 0 if current has the requested access, error code otherwise
3032 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
3034 struct smack_known
*ssp
= smack_of_shm(shp
);
3035 struct smk_audit_info ad
;
3039 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3040 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
3042 rc
= smk_curacc(ssp
, access
, &ad
);
3043 rc
= smk_bu_current("shm", ssp
, access
, rc
);
3048 * smack_shm_associate - Smack access check for shm
3050 * @shmflg: access requested
3052 * Returns 0 if current has the requested access, error code otherwise
3054 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
3058 may
= smack_flags_to_may(shmflg
);
3059 return smk_curacc_shm(shp
, may
);
3063 * smack_shm_shmctl - Smack access check for shm
3065 * @cmd: what it wants to do
3067 * Returns 0 if current has the requested access, error code otherwise
3069 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
3082 may
= MAY_READWRITE
;
3087 * System level information.
3093 return smk_curacc_shm(shp
, may
);
3097 * smack_shm_shmat - Smack access for shmat
3100 * @shmflg: access requested
3102 * Returns 0 if current has the requested access, error code otherwise
3104 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
3109 may
= smack_flags_to_may(shmflg
);
3110 return smk_curacc_shm(shp
, may
);
3114 * smack_of_sem - the smack pointer for the sem
3117 * Returns a pointer to the smack value
3119 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
3121 return (struct smack_known
*)sma
->sem_perm
.security
;
3125 * smack_sem_alloc_security - Set the security blob for sem
3130 static int smack_sem_alloc_security(struct sem_array
*sma
)
3132 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3133 struct smack_known
*skp
= smk_of_current();
3135 isp
->security
= skp
;
3140 * smack_sem_free_security - Clear the security blob for sem
3143 * Clears the blob pointer
3145 static void smack_sem_free_security(struct sem_array
*sma
)
3147 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3149 isp
->security
= NULL
;
3153 * smk_curacc_sem : check if current has access on sem
3155 * @access : access requested
3157 * Returns 0 if current has the requested access, error code otherwise
3159 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3161 struct smack_known
*ssp
= smack_of_sem(sma
);
3162 struct smk_audit_info ad
;
3166 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3167 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3169 rc
= smk_curacc(ssp
, access
, &ad
);
3170 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3175 * smack_sem_associate - Smack access check for sem
3177 * @semflg: access requested
3179 * Returns 0 if current has the requested access, error code otherwise
3181 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3185 may
= smack_flags_to_may(semflg
);
3186 return smk_curacc_sem(sma
, may
);
3190 * smack_sem_shmctl - Smack access check for sem
3192 * @cmd: what it wants to do
3194 * Returns 0 if current has the requested access, error code otherwise
3196 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3214 may
= MAY_READWRITE
;
3219 * System level information
3226 return smk_curacc_sem(sma
, may
);
3230 * smack_sem_semop - Smack checks of semaphore operations
3236 * Treated as read and write in all cases.
3238 * Returns 0 if access is allowed, error code otherwise
3240 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3241 unsigned nsops
, int alter
)
3243 return smk_curacc_sem(sma
, MAY_READWRITE
);
3247 * smack_msg_alloc_security - Set the security blob for msg
3252 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3254 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3255 struct smack_known
*skp
= smk_of_current();
3257 kisp
->security
= skp
;
3262 * smack_msg_free_security - Clear the security blob for msg
3265 * Clears the blob pointer
3267 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3269 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3271 kisp
->security
= NULL
;
3275 * smack_of_msq - the smack pointer for the msq
3278 * Returns a pointer to the smack label entry
3280 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3282 return (struct smack_known
*)msq
->q_perm
.security
;
3286 * smk_curacc_msq : helper to check if current has access on msq
3288 * @access : access requested
3290 * return 0 if current has access, error otherwise
3292 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3294 struct smack_known
*msp
= smack_of_msq(msq
);
3295 struct smk_audit_info ad
;
3299 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3300 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3302 rc
= smk_curacc(msp
, access
, &ad
);
3303 rc
= smk_bu_current("msq", msp
, access
, rc
);
3308 * smack_msg_queue_associate - Smack access check for msg_queue
3310 * @msqflg: access requested
3312 * Returns 0 if current has the requested access, error code otherwise
3314 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3318 may
= smack_flags_to_may(msqflg
);
3319 return smk_curacc_msq(msq
, may
);
3323 * smack_msg_queue_msgctl - Smack access check for msg_queue
3325 * @cmd: what it wants to do
3327 * Returns 0 if current has the requested access, error code otherwise
3329 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3340 may
= MAY_READWRITE
;
3345 * System level information
3352 return smk_curacc_msq(msq
, may
);
3356 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3359 * @msqflg: access requested
3361 * Returns 0 if current has the requested access, error code otherwise
3363 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3368 may
= smack_flags_to_may(msqflg
);
3369 return smk_curacc_msq(msq
, may
);
3373 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3380 * Returns 0 if current has read and write access, error code otherwise
3382 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3383 struct task_struct
*target
, long type
, int mode
)
3385 return smk_curacc_msq(msq
, MAY_READWRITE
);
3389 * smack_ipc_permission - Smack access for ipc_permission()
3390 * @ipp: the object permissions
3391 * @flag: access requested
3393 * Returns 0 if current has read and write access, error code otherwise
3395 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3397 struct smack_known
*iskp
= ipp
->security
;
3398 int may
= smack_flags_to_may(flag
);
3399 struct smk_audit_info ad
;
3403 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3404 ad
.a
.u
.ipc_id
= ipp
->id
;
3406 rc
= smk_curacc(iskp
, may
, &ad
);
3407 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3412 * smack_ipc_getsecid - Extract smack security id
3413 * @ipp: the object permissions
3414 * @secid: where result will be saved
3416 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3418 struct smack_known
*iskp
= ipp
->security
;
3420 *secid
= iskp
->smk_secid
;
3424 * smack_d_instantiate - Make sure the blob is correct on an inode
3425 * @opt_dentry: dentry where inode will be attached
3426 * @inode: the object
3428 * Set the inode's security blob if it hasn't been done already.
3430 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3432 struct super_block
*sbp
;
3433 struct superblock_smack
*sbsp
;
3434 struct inode_smack
*isp
;
3435 struct smack_known
*skp
;
3436 struct smack_known
*ckp
= smk_of_current();
3437 struct smack_known
*final
;
3438 char trattr
[TRANS_TRUE_SIZE
];
3446 isp
= inode
->i_security
;
3448 mutex_lock(&isp
->smk_lock
);
3450 * If the inode is already instantiated
3451 * take the quick way out
3453 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3457 sbsp
= sbp
->s_security
;
3459 * We're going to use the superblock default label
3460 * if there's no label on the file.
3462 final
= sbsp
->smk_default
;
3465 * If this is the root inode the superblock
3466 * may be in the process of initialization.
3467 * If that is the case use the root value out
3468 * of the superblock.
3470 if (opt_dentry
->d_parent
== opt_dentry
) {
3471 switch (sbp
->s_magic
) {
3472 case CGROUP_SUPER_MAGIC
:
3474 * The cgroup filesystem is never mounted,
3475 * so there's no opportunity to set the mount
3478 sbsp
->smk_root
= &smack_known_star
;
3479 sbsp
->smk_default
= &smack_known_star
;
3480 isp
->smk_inode
= sbsp
->smk_root
;
3484 * What about shmem/tmpfs anonymous files with dentry
3485 * obtained from d_alloc_pseudo()?
3487 isp
->smk_inode
= smk_of_current();
3490 isp
->smk_inode
= smk_of_current();
3493 isp
->smk_inode
= sbsp
->smk_root
;
3496 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3501 * This is pretty hackish.
3502 * Casey says that we shouldn't have to do
3503 * file system specific code, but it does help
3504 * with keeping it simple.
3506 switch (sbp
->s_magic
) {
3510 case CGROUP_SUPER_MAGIC
:
3512 * Casey says that it's a little embarrassing
3513 * that the smack file system doesn't do
3514 * extended attributes.
3516 * Casey says pipes are easy (?)
3518 * Socket access is controlled by the socket
3519 * structures associated with the task involved.
3521 * Cgroupfs is special
3523 final
= &smack_known_star
;
3525 case DEVPTS_SUPER_MAGIC
:
3527 * devpts seems content with the label of the task.
3528 * Programs that change smack have to treat the
3533 case PROC_SUPER_MAGIC
:
3535 * Casey says procfs appears not to care.
3536 * The superblock default suffices.
3541 * Device labels should come from the filesystem,
3542 * but watch out, because they're volitile,
3543 * getting recreated on every reboot.
3545 final
= &smack_known_star
;
3549 * If a smack value has been set we want to use it,
3550 * but since tmpfs isn't giving us the opportunity
3551 * to set mount options simulate setting the
3552 * superblock default.
3556 * This isn't an understood special case.
3557 * Get the value from the xattr.
3561 * UNIX domain sockets use lower level socket data.
3563 if (S_ISSOCK(inode
->i_mode
)) {
3564 final
= &smack_known_star
;
3568 * No xattr support means, alas, no SMACK label.
3569 * Use the aforeapplied default.
3570 * It would be curious if the label of the task
3571 * does not match that assigned.
3573 if (!(inode
->i_opflags
& IOP_XATTR
))
3576 * Get the dentry for xattr.
3578 dp
= dget(opt_dentry
);
3579 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3580 if (!IS_ERR_OR_NULL(skp
))
3584 * Transmuting directory
3586 if (S_ISDIR(inode
->i_mode
)) {
3588 * If this is a new directory and the label was
3589 * transmuted when the inode was initialized
3590 * set the transmute attribute on the directory
3591 * and mark the inode.
3593 * If there is a transmute attribute on the
3594 * directory mark the inode.
3596 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3597 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3598 rc
= __vfs_setxattr(dp
, inode
,
3599 XATTR_NAME_SMACKTRANSMUTE
,
3600 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3603 rc
= __vfs_getxattr(dp
, inode
,
3604 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3606 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3607 TRANS_TRUE_SIZE
) != 0)
3611 transflag
= SMK_INODE_TRANSMUTE
;
3614 * Don't let the exec or mmap label be "*" or "@".
3616 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3617 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3618 skp
== &smack_known_web
)
3620 isp
->smk_task
= skp
;
3622 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3623 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3624 skp
== &smack_known_web
)
3626 isp
->smk_mmap
= skp
;
3633 isp
->smk_inode
= ckp
;
3635 isp
->smk_inode
= final
;
3637 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3640 mutex_unlock(&isp
->smk_lock
);
3645 * smack_getprocattr - Smack process attribute access
3646 * @p: the object task
3647 * @name: the name of the attribute in /proc/.../attr
3648 * @value: where to put the result
3650 * Places a copy of the task Smack into value
3652 * Returns the length of the smack label or an error code
3654 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3656 struct smack_known
*skp
= smk_of_task_struct(p
);
3660 if (strcmp(name
, "current") != 0)
3663 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3673 * smack_setprocattr - Smack process attribute setting
3674 * @p: the object task
3675 * @name: the name of the attribute in /proc/.../attr
3676 * @value: the value to set
3677 * @size: the size of the value
3679 * Sets the Smack value of the task. Only setting self
3680 * is permitted and only with privilege
3682 * Returns the length of the smack label or an error code
3684 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3685 void *value
, size_t size
)
3687 struct task_smack
*tsp
= current_security();
3689 struct smack_known
*skp
;
3690 struct smack_known_list_elem
*sklep
;
3694 * Changing another process' Smack value is too dangerous
3695 * and supports no sane use case.
3700 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3703 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3706 if (strcmp(name
, "current") != 0)
3709 skp
= smk_import_entry(value
, size
);
3711 return PTR_ERR(skp
);
3714 * No process is ever allowed the web ("@") label
3715 * and the star ("*") label.
3717 if (skp
== &smack_known_web
|| skp
== &smack_known_star
)
3720 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3722 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3723 if (sklep
->smk_label
== skp
) {
3731 new = prepare_creds();
3735 tsp
= new->security
;
3736 tsp
->smk_task
= skp
;
3738 * process can change its label only once
3740 smk_destroy_label_list(&tsp
->smk_relabel
);
3747 * smack_unix_stream_connect - Smack access on UDS
3749 * @other: the other sock
3752 * Return 0 if a subject with the smack of sock could access
3753 * an object with the smack of other, otherwise an error code
3755 static int smack_unix_stream_connect(struct sock
*sock
,
3756 struct sock
*other
, struct sock
*newsk
)
3758 struct smack_known
*skp
;
3759 struct smack_known
*okp
;
3760 struct socket_smack
*ssp
= sock
->sk_security
;
3761 struct socket_smack
*osp
= other
->sk_security
;
3762 struct socket_smack
*nsp
= newsk
->sk_security
;
3763 struct smk_audit_info ad
;
3766 struct lsm_network_audit net
;
3769 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3773 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3774 smk_ad_setfield_u_net_sk(&ad
, other
);
3776 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3777 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3781 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3782 rc
= smk_bu_note("UDS connect", okp
, skp
,
3788 * Cross reference the peer labels for SO_PEERSEC.
3791 nsp
->smk_packet
= ssp
->smk_out
;
3792 ssp
->smk_packet
= osp
->smk_out
;
3799 * smack_unix_may_send - Smack access on UDS
3801 * @other: the other socket
3803 * Return 0 if a subject with the smack of sock could access
3804 * an object with the smack of other, otherwise an error code
3806 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3808 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3809 struct socket_smack
*osp
= other
->sk
->sk_security
;
3810 struct smk_audit_info ad
;
3814 struct lsm_network_audit net
;
3816 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3817 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3820 if (smack_privileged(CAP_MAC_OVERRIDE
))
3823 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3824 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3829 * smack_socket_sendmsg - Smack check based on destination host
3832 * @size: the size of the message
3834 * Return 0 if the current subject can write to the destination host.
3835 * For IPv4 this is only a question if the destination is a single label host.
3836 * For IPv6 this is a check against the label of the port.
3838 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3841 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3842 #if IS_ENABLED(CONFIG_IPV6)
3843 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3845 #ifdef SMACK_IPV6_SECMARK_LABELING
3846 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3847 struct smack_known
*rsp
;
3852 * Perfectly reasonable for this to be NULL
3857 switch (sock
->sk
->sk_family
) {
3859 rc
= smack_netlabel_send(sock
->sk
, sip
);
3862 #ifdef SMACK_IPV6_SECMARK_LABELING
3863 rsp
= smack_ipv6host_label(sap
);
3865 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3868 #ifdef SMACK_IPV6_PORT_LABELING
3869 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3877 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3878 * @sap: netlabel secattr
3879 * @ssp: socket security information
3881 * Returns a pointer to a Smack label entry found on the label list.
3883 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3884 struct socket_smack
*ssp
)
3886 struct smack_known
*skp
;
3891 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3893 * Looks like a CIPSO packet.
3894 * If there are flags but no level netlabel isn't
3895 * behaving the way we expect it to.
3897 * Look it up in the label table
3898 * Without guidance regarding the smack value
3899 * for the packet fall back on the network
3903 list_for_each_entry(skp
, &smack_known_list
, list
) {
3904 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3907 * Compare the catsets. Use the netlbl APIs.
3909 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3910 if ((skp
->smk_netlabel
.flags
&
3911 NETLBL_SECATTR_MLS_CAT
) == 0)
3915 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3916 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3918 kcat
= netlbl_catmap_walk(
3919 skp
->smk_netlabel
.attr
.mls
.cat
,
3921 if (acat
< 0 || kcat
< 0)
3934 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3935 return &smack_known_web
;
3936 return &smack_known_star
;
3938 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0)
3940 * Looks like a fallback, which gives us a secid.
3942 return smack_from_secid(sap
->attr
.secid
);
3944 * Without guidance regarding the smack value
3945 * for the packet fall back on the network
3948 return smack_net_ambient
;
3951 #if IS_ENABLED(CONFIG_IPV6)
3952 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3956 int proto
= -EINVAL
;
3957 struct ipv6hdr _ipv6h
;
3958 struct ipv6hdr
*ip6
;
3960 struct tcphdr _tcph
, *th
;
3961 struct udphdr _udph
, *uh
;
3962 struct dccp_hdr _dccph
, *dh
;
3966 offset
= skb_network_offset(skb
);
3967 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3970 sip
->sin6_addr
= ip6
->saddr
;
3972 nexthdr
= ip6
->nexthdr
;
3973 offset
+= sizeof(_ipv6h
);
3974 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3981 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3983 sip
->sin6_port
= th
->source
;
3986 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3988 sip
->sin6_port
= uh
->source
;
3991 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3993 sip
->sin6_port
= dh
->dccph_sport
;
3998 #endif /* CONFIG_IPV6 */
4001 * smack_socket_sock_rcv_skb - Smack packet delivery access check
4005 * Returns 0 if the packet should be delivered, an error code otherwise
4007 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
4009 struct netlbl_lsm_secattr secattr
;
4010 struct socket_smack
*ssp
= sk
->sk_security
;
4011 struct smack_known
*skp
= NULL
;
4013 struct smk_audit_info ad
;
4015 struct lsm_network_audit net
;
4017 #if IS_ENABLED(CONFIG_IPV6)
4018 struct sockaddr_in6 sadd
;
4020 #endif /* CONFIG_IPV6 */
4022 switch (sk
->sk_family
) {
4024 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4026 * If there is a secmark use it rather than the CIPSO label.
4027 * If there is no secmark fall back to CIPSO.
4028 * The secmark is assumed to reflect policy better.
4030 if (skb
&& skb
->secmark
!= 0) {
4031 skp
= smack_from_secid(skb
->secmark
);
4034 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4036 * Translate what netlabel gave us.
4038 netlbl_secattr_init(&secattr
);
4040 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
4042 skp
= smack_from_secattr(&secattr
, ssp
);
4044 skp
= smack_net_ambient
;
4046 netlbl_secattr_destroy(&secattr
);
4048 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4052 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4053 ad
.a
.u
.net
->family
= sk
->sk_family
;
4054 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4055 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4058 * Receiving a packet requires that the other end
4059 * be able to write here. Read access is not required.
4060 * This is the simplist possible security model
4063 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4064 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
4067 netlbl_skbuff_err(skb
, sk
->sk_family
, rc
, 0);
4069 #if IS_ENABLED(CONFIG_IPV6)
4071 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
4072 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
4074 #ifdef SMACK_IPV6_SECMARK_LABELING
4075 if (skb
&& skb
->secmark
!= 0)
4076 skp
= smack_from_secid(skb
->secmark
);
4078 skp
= smack_ipv6host_label(&sadd
);
4080 skp
= smack_net_ambient
;
4082 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4083 ad
.a
.u
.net
->family
= sk
->sk_family
;
4084 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4085 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4086 #endif /* CONFIG_AUDIT */
4087 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4088 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
4090 #endif /* SMACK_IPV6_SECMARK_LABELING */
4091 #ifdef SMACK_IPV6_PORT_LABELING
4092 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
4093 #endif /* SMACK_IPV6_PORT_LABELING */
4095 #endif /* CONFIG_IPV6 */
4102 * smack_socket_getpeersec_stream - pull in packet label
4104 * @optval: user's destination
4105 * @optlen: size thereof
4108 * returns zero on success, an error code otherwise
4110 static int smack_socket_getpeersec_stream(struct socket
*sock
,
4111 char __user
*optval
,
4112 int __user
*optlen
, unsigned len
)
4114 struct socket_smack
*ssp
;
4119 ssp
= sock
->sk
->sk_security
;
4120 if (ssp
->smk_packet
!= NULL
) {
4121 rcp
= ssp
->smk_packet
->smk_known
;
4122 slen
= strlen(rcp
) + 1;
4127 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4130 if (put_user(slen
, optlen
) != 0)
4138 * smack_socket_getpeersec_dgram - pull in packet label
4139 * @sock: the peer socket
4141 * @secid: pointer to where to put the secid of the packet
4143 * Sets the netlabel socket state on sk from parent
4145 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4146 struct sk_buff
*skb
, u32
*secid
)
4149 struct netlbl_lsm_secattr secattr
;
4150 struct socket_smack
*ssp
= NULL
;
4151 struct smack_known
*skp
;
4152 int family
= PF_UNSPEC
;
4153 u32 s
= 0; /* 0 is the invalid secid */
4157 if (skb
->protocol
== htons(ETH_P_IP
))
4159 #if IS_ENABLED(CONFIG_IPV6)
4160 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4162 #endif /* CONFIG_IPV6 */
4164 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4165 family
= sock
->sk
->sk_family
;
4169 ssp
= sock
->sk
->sk_security
;
4170 s
= ssp
->smk_out
->smk_secid
;
4173 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4179 * Translate what netlabel gave us.
4181 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4182 ssp
= sock
->sk
->sk_security
;
4183 netlbl_secattr_init(&secattr
);
4184 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4186 skp
= smack_from_secattr(&secattr
, ssp
);
4189 netlbl_secattr_destroy(&secattr
);
4192 #ifdef SMACK_IPV6_SECMARK_LABELING
4204 * smack_sock_graft - Initialize a newly created socket with an existing sock
4206 * @parent: parent socket
4208 * Set the smk_{in,out} state of an existing sock based on the process that
4209 * is creating the new socket.
4211 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4213 struct socket_smack
*ssp
;
4214 struct smack_known
*skp
= smk_of_current();
4217 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4220 ssp
= sk
->sk_security
;
4223 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4227 * smack_inet_conn_request - Smack access check on connect
4228 * @sk: socket involved
4232 * Returns 0 if a task with the packet label could write to
4233 * the socket, otherwise an error code
4235 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4236 struct request_sock
*req
)
4238 u16 family
= sk
->sk_family
;
4239 struct smack_known
*skp
;
4240 struct socket_smack
*ssp
= sk
->sk_security
;
4241 struct netlbl_lsm_secattr secattr
;
4242 struct sockaddr_in addr
;
4244 struct smack_known
*hskp
;
4246 struct smk_audit_info ad
;
4248 struct lsm_network_audit net
;
4251 #if IS_ENABLED(CONFIG_IPV6)
4252 if (family
== PF_INET6
) {
4254 * Handle mapped IPv4 packets arriving
4255 * via IPv6 sockets. Don't set up netlabel
4256 * processing on IPv6.
4258 if (skb
->protocol
== htons(ETH_P_IP
))
4263 #endif /* CONFIG_IPV6 */
4265 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4267 * If there is a secmark use it rather than the CIPSO label.
4268 * If there is no secmark fall back to CIPSO.
4269 * The secmark is assumed to reflect policy better.
4271 if (skb
&& skb
->secmark
!= 0) {
4272 skp
= smack_from_secid(skb
->secmark
);
4275 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4277 netlbl_secattr_init(&secattr
);
4278 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4280 skp
= smack_from_secattr(&secattr
, ssp
);
4282 skp
= &smack_known_huh
;
4283 netlbl_secattr_destroy(&secattr
);
4285 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4290 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4291 ad
.a
.u
.net
->family
= family
;
4292 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4293 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4296 * Receiving a packet requires that the other end be able to write
4297 * here. Read access is not required.
4299 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4300 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4305 * Save the peer's label in the request_sock so we can later setup
4306 * smk_packet in the child socket so that SO_PEERCRED can report it.
4308 req
->peer_secid
= skp
->smk_secid
;
4311 * We need to decide if we want to label the incoming connection here
4312 * if we do we only need to label the request_sock and the stack will
4313 * propagate the wire-label to the sock when it is created.
4316 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4318 hskp
= smack_ipv4host_label(&addr
);
4322 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4324 netlbl_req_delattr(req
);
4330 * smack_inet_csk_clone - Copy the connection information to the new socket
4331 * @sk: the new socket
4332 * @req: the connection's request_sock
4334 * Transfer the connection's peer label to the newly created socket.
4336 static void smack_inet_csk_clone(struct sock
*sk
,
4337 const struct request_sock
*req
)
4339 struct socket_smack
*ssp
= sk
->sk_security
;
4340 struct smack_known
*skp
;
4342 if (req
->peer_secid
!= 0) {
4343 skp
= smack_from_secid(req
->peer_secid
);
4344 ssp
->smk_packet
= skp
;
4346 ssp
->smk_packet
= NULL
;
4350 * Key management security hooks
4352 * Casey has not tested key support very heavily.
4353 * The permission check is most likely too restrictive.
4354 * If you care about keys please have a look.
4359 * smack_key_alloc - Set the key security blob
4361 * @cred: the credentials to use
4364 * No allocation required
4368 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4369 unsigned long flags
)
4371 struct smack_known
*skp
= smk_of_task(cred
->security
);
4373 key
->security
= skp
;
4378 * smack_key_free - Clear the key security blob
4381 * Clear the blob pointer
4383 static void smack_key_free(struct key
*key
)
4385 key
->security
= NULL
;
4389 * smack_key_permission - Smack access on a key
4390 * @key_ref: gets to the object
4391 * @cred: the credentials to use
4392 * @perm: requested key permissions
4394 * Return 0 if the task has read and write to the object,
4395 * an error code otherwise
4397 static int smack_key_permission(key_ref_t key_ref
,
4398 const struct cred
*cred
, unsigned perm
)
4401 struct smk_audit_info ad
;
4402 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4406 keyp
= key_ref_to_ptr(key_ref
);
4410 * If the key hasn't been initialized give it access so that
4413 if (keyp
->security
== NULL
)
4416 * This should not occur
4421 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4422 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4423 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4425 if (perm
& KEY_NEED_READ
)
4427 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4428 request
= MAY_WRITE
;
4429 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4430 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4435 * smack_key_getsecurity - Smack label tagging the key
4436 * @key points to the key to be queried
4437 * @_buffer points to a pointer that should be set to point to the
4438 * resulting string (if no label or an error occurs).
4439 * Return the length of the string (including terminating NUL) or -ve if
4441 * May also return 0 (and a NULL buffer pointer) if there is no label.
4443 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4445 struct smack_known
*skp
= key
->security
;
4449 if (key
->security
== NULL
) {
4454 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4457 length
= strlen(copy
) + 1;
4463 #endif /* CONFIG_KEYS */
4468 * Audit requires a unique representation of each Smack specific
4469 * rule. This unique representation is used to distinguish the
4470 * object to be audited from remaining kernel objects and also
4471 * works as a glue between the audit hooks.
4473 * Since repository entries are added but never deleted, we'll use
4474 * the smack_known label address related to the given audit rule as
4475 * the needed unique representation. This also better fits the smack
4476 * model where nearly everything is a label.
4481 * smack_audit_rule_init - Initialize a smack audit rule
4482 * @field: audit rule fields given from user-space (audit.h)
4483 * @op: required testing operator (=, !=, >, <, ...)
4484 * @rulestr: smack label to be audited
4485 * @vrule: pointer to save our own audit rule representation
4487 * Prepare to audit cases where (@field @op @rulestr) is true.
4488 * The label to be audited is created if necessay.
4490 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4492 struct smack_known
*skp
;
4493 char **rule
= (char **)vrule
;
4496 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4499 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4502 skp
= smk_import_entry(rulestr
, 0);
4504 return PTR_ERR(skp
);
4506 *rule
= skp
->smk_known
;
4512 * smack_audit_rule_known - Distinguish Smack audit rules
4513 * @krule: rule of interest, in Audit kernel representation format
4515 * This is used to filter Smack rules from remaining Audit ones.
4516 * If it's proved that this rule belongs to us, the
4517 * audit_rule_match hook will be called to do the final judgement.
4519 static int smack_audit_rule_known(struct audit_krule
*krule
)
4521 struct audit_field
*f
;
4524 for (i
= 0; i
< krule
->field_count
; i
++) {
4525 f
= &krule
->fields
[i
];
4527 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4535 * smack_audit_rule_match - Audit given object ?
4536 * @secid: security id for identifying the object to test
4537 * @field: audit rule flags given from user-space
4538 * @op: required testing operator
4539 * @vrule: smack internal rule presentation
4540 * @actx: audit context associated with the check
4542 * The core Audit hook. It's used to take the decision of
4543 * whether to audit or not to audit a given object.
4545 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4546 struct audit_context
*actx
)
4548 struct smack_known
*skp
;
4551 if (unlikely(!rule
)) {
4552 WARN_ONCE(1, "Smack: missing rule\n");
4556 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4559 skp
= smack_from_secid(secid
);
4562 * No need to do string comparisons. If a match occurs,
4563 * both pointers will point to the same smack_known
4566 if (op
== Audit_equal
)
4567 return (rule
== skp
->smk_known
);
4568 if (op
== Audit_not_equal
)
4569 return (rule
!= skp
->smk_known
);
4575 * There is no need for a smack_audit_rule_free hook.
4576 * No memory was allocated.
4579 #endif /* CONFIG_AUDIT */
4582 * smack_ismaclabel - check if xattr @name references a smack MAC label
4583 * @name: Full xattr name to check.
4585 static int smack_ismaclabel(const char *name
)
4587 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4592 * smack_secid_to_secctx - return the smack label for a secid
4593 * @secid: incoming integer
4594 * @secdata: destination
4595 * @seclen: how long it is
4597 * Exists for networking code.
4599 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4601 struct smack_known
*skp
= smack_from_secid(secid
);
4604 *secdata
= skp
->smk_known
;
4605 *seclen
= strlen(skp
->smk_known
);
4610 * smack_secctx_to_secid - return the secid for a smack label
4611 * @secdata: smack label
4612 * @seclen: how long result is
4613 * @secid: outgoing integer
4615 * Exists for audit and networking code.
4617 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4619 struct smack_known
*skp
= smk_find_entry(secdata
);
4622 *secid
= skp
->smk_secid
;
4629 * There used to be a smack_release_secctx hook
4630 * that did nothing back when hooks were in a vector.
4631 * Now that there's a list such a hook adds cost.
4634 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4636 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4639 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4641 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4644 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4647 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4655 static struct security_hook_list smack_hooks
[] = {
4656 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4657 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4658 LSM_HOOK_INIT(syslog
, smack_syslog
),
4660 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4661 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4662 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4663 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4664 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4665 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4666 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4668 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4669 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4670 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4672 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4673 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4674 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4675 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4676 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4677 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4678 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4679 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4680 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4681 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4682 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4683 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4684 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4685 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4686 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4687 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4688 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4689 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4691 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4692 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4693 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4694 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4695 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4696 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4697 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4698 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4699 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4700 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4702 LSM_HOOK_INIT(file_open
, smack_file_open
),
4704 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4705 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4706 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4707 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4708 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4709 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4710 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4711 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4712 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4713 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4714 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4715 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4716 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4717 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4718 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4719 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4720 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4721 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4722 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4724 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4725 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4727 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4728 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4730 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4731 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4732 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4733 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4734 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4735 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4737 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4738 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4739 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4740 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4741 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4743 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4744 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4745 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4746 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4747 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4749 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4751 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4752 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4754 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4755 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4757 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4758 #ifdef SMACK_IPV6_PORT_LABELING
4759 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4761 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4762 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4763 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4764 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4765 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4766 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4767 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4768 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4769 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4770 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4772 /* key management security hooks */
4774 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4775 LSM_HOOK_INIT(key_free
, smack_key_free
),
4776 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4777 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4778 #endif /* CONFIG_KEYS */
4782 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4783 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4784 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4785 #endif /* CONFIG_AUDIT */
4787 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4788 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4789 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4790 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4791 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4792 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4796 static __init
void init_smack_known_list(void)
4799 * Initialize rule list locks
4801 mutex_init(&smack_known_huh
.smk_rules_lock
);
4802 mutex_init(&smack_known_hat
.smk_rules_lock
);
4803 mutex_init(&smack_known_floor
.smk_rules_lock
);
4804 mutex_init(&smack_known_star
.smk_rules_lock
);
4805 mutex_init(&smack_known_web
.smk_rules_lock
);
4807 * Initialize rule lists
4809 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4810 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4811 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4812 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4813 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4815 * Create the known labels list
4817 smk_insert_entry(&smack_known_huh
);
4818 smk_insert_entry(&smack_known_hat
);
4819 smk_insert_entry(&smack_known_star
);
4820 smk_insert_entry(&smack_known_floor
);
4821 smk_insert_entry(&smack_known_web
);
4825 * smack_init - initialize the smack system
4829 static __init
int smack_init(void)
4832 struct task_smack
*tsp
;
4834 if (!security_module_enable("smack"))
4837 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4838 if (!smack_inode_cache
)
4841 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4844 kmem_cache_destroy(smack_inode_cache
);
4850 pr_info("Smack: Initializing.\n");
4851 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4852 pr_info("Smack: Netfilter enabled.\n");
4854 #ifdef SMACK_IPV6_PORT_LABELING
4855 pr_info("Smack: IPv6 port labeling enabled.\n");
4857 #ifdef SMACK_IPV6_SECMARK_LABELING
4858 pr_info("Smack: IPv6 Netfilter enabled.\n");
4862 * Set the security state for the initial task.
4864 cred
= (struct cred
*) current
->cred
;
4865 cred
->security
= tsp
;
4867 /* initialize the smack_known_list */
4868 init_smack_known_list();
4873 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4879 * Smack requires early initialization in order to label
4880 * all processes and objects when they are created.
4882 security_initcall(smack_init
);