1 // SPDX-License-Identifier: GPL-2.0-only
3 * Simplified MAC Kernel (smack) security module
5 * This file contains the smack hook function implementations.
8 * Casey Schaufler <casey@schaufler-ca.com>
9 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
11 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
12 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
13 * Paul Moore <paul@paul-moore.com>
14 * Copyright (C) 2010 Nokia Corporation
15 * Copyright (C) 2011 Intel Corporation.
18 #include <linux/xattr.h>
19 #include <linux/pagemap.h>
20 #include <linux/mount.h>
21 #include <linux/stat.h>
23 #include <asm/ioctls.h>
25 #include <linux/tcp.h>
26 #include <linux/udp.h>
27 #include <linux/dccp.h>
28 #include <linux/icmpv6.h>
29 #include <linux/slab.h>
30 #include <linux/mutex.h>
31 #include <net/cipso_ipv4.h>
34 #include <linux/audit.h>
35 #include <linux/magic.h>
36 #include <linux/dcache.h>
37 #include <linux/personality.h>
38 #include <linux/msg.h>
39 #include <linux/shm.h>
40 #include <linux/binfmts.h>
41 #include <linux/parser.h>
42 #include <linux/fs_context.h>
43 #include <linux/fs_parser.h>
44 #include <linux/watch_queue.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 static DEFINE_MUTEX(smack_ipv6_lock
);
55 static LIST_HEAD(smk_ipv6_port_list
);
56 struct kmem_cache
*smack_rule_cache
;
59 #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
64 } smk_mount_opts
[] = {
65 {"smackfsdef", sizeof("smackfsdef") - 1, Opt_fsdefault
},
66 A(fsdefault
), A(fsfloor
), A(fshat
), A(fsroot
), A(fstransmute
)
70 static int match_opt_prefix(char *s
, int l
, char **arg
)
74 for (i
= 0; i
< ARRAY_SIZE(smk_mount_opts
); i
++) {
75 size_t len
= smk_mount_opts
[i
].len
;
76 if (len
> l
|| memcmp(s
, smk_mount_opts
[i
].name
, len
))
78 if (len
== l
|| s
[len
] != '=')
81 return smk_mount_opts
[i
].opt
;
86 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
87 static char *smk_bu_mess
[] = {
88 "Bringup Error", /* Unused */
89 "Bringup", /* SMACK_BRINGUP_ALLOW */
90 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
91 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
94 static void smk_bu_mode(int mode
, char *s
)
100 if (mode
& MAY_WRITE
)
104 if (mode
& MAY_APPEND
)
106 if (mode
& MAY_TRANSMUTE
)
116 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
117 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
118 struct smack_known
*oskp
, int mode
, int rc
)
120 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
124 if (rc
> SMACK_UNCONFINED_OBJECT
)
127 smk_bu_mode(mode
, acc
);
128 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
129 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
133 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
136 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
137 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
140 struct task_smack
*tsp
= smack_cred(current_cred());
141 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
145 if (rc
> SMACK_UNCONFINED_OBJECT
)
148 smk_bu_mode(mode
, acc
);
149 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
150 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
151 acc
, current
->comm
, note
);
155 #define smk_bu_current(note, oskp, mode, RC) (RC)
158 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
159 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
161 struct task_smack
*tsp
= smack_cred(current_cred());
162 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
163 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
167 if (rc
> SMACK_UNCONFINED_OBJECT
)
170 smk_bu_mode(mode
, acc
);
171 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
172 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
173 current
->comm
, otp
->comm
);
177 #define smk_bu_task(otp, mode, RC) (RC)
180 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
181 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
183 struct task_smack
*tsp
= smack_cred(current_cred());
184 struct inode_smack
*isp
= smack_inode(inode
);
185 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
187 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
188 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
189 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
193 if (rc
> SMACK_UNCONFINED_OBJECT
)
195 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
196 (mode
& (MAY_WRITE
| MAY_APPEND
)))
197 isp
->smk_flags
|= SMK_INODE_IMPURE
;
199 smk_bu_mode(mode
, acc
);
201 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
202 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
203 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
207 #define smk_bu_inode(inode, mode, RC) (RC)
210 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
211 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
213 struct task_smack
*tsp
= smack_cred(current_cred());
214 struct smack_known
*sskp
= tsp
->smk_task
;
215 struct inode
*inode
= file_inode(file
);
216 struct inode_smack
*isp
= smack_inode(inode
);
217 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
219 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
220 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
221 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
225 if (rc
> SMACK_UNCONFINED_OBJECT
)
228 smk_bu_mode(mode
, acc
);
229 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
230 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
231 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
236 #define smk_bu_file(file, mode, RC) (RC)
239 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
240 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
243 struct task_smack
*tsp
= smack_cred(cred
);
244 struct smack_known
*sskp
= tsp
->smk_task
;
245 struct inode
*inode
= file_inode(file
);
246 struct inode_smack
*isp
= smack_inode(inode
);
247 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
249 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
250 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
251 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
255 if (rc
> SMACK_UNCONFINED_OBJECT
)
258 smk_bu_mode(mode
, acc
);
259 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
260 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
261 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
266 #define smk_bu_credfile(cred, file, mode, RC) (RC)
270 * smk_fetch - Fetch the smack label from a file.
271 * @name: type of the label (attribute)
272 * @ip: a pointer to the inode
273 * @dp: a pointer to the dentry
275 * Returns a pointer to the master list entry for the Smack label,
276 * NULL if there was no label to fetch, or an error code.
278 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
283 struct smack_known
*skp
= NULL
;
285 if (!(ip
->i_opflags
& IOP_XATTR
))
286 return ERR_PTR(-EOPNOTSUPP
);
288 buffer
= kzalloc(SMK_LONGLABEL
, GFP_NOFS
);
290 return ERR_PTR(-ENOMEM
);
292 rc
= __vfs_getxattr(dp
, ip
, name
, buffer
, SMK_LONGLABEL
);
298 skp
= smk_import_entry(buffer
, rc
);
306 * init_inode_smack - initialize an inode security blob
307 * @inode: inode to extract the info from
308 * @skp: a pointer to the Smack label entry to use in the blob
311 static void init_inode_smack(struct inode
*inode
, struct smack_known
*skp
)
313 struct inode_smack
*isp
= smack_inode(inode
);
315 isp
->smk_inode
= skp
;
320 * init_task_smack - initialize a task security blob
321 * @tsp: blob to initialize
322 * @task: a pointer to the Smack label for the running task
323 * @forked: a pointer to the Smack label for the forked task
326 static void init_task_smack(struct task_smack
*tsp
, struct smack_known
*task
,
327 struct smack_known
*forked
)
329 tsp
->smk_task
= task
;
330 tsp
->smk_forked
= forked
;
331 INIT_LIST_HEAD(&tsp
->smk_rules
);
332 INIT_LIST_HEAD(&tsp
->smk_relabel
);
333 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
= kmem_cache_zalloc(smack_rule_cache
, 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
;
423 const struct cred
*tracercred
;
425 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
426 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
427 smk_ad_setfield_u_tsk(&ad
, tracer
);
432 tracercred
= __task_cred(tracer
);
433 tsp
= smack_cred(tracercred
);
434 tracer_known
= smk_of_task(tsp
);
436 if ((mode
& PTRACE_MODE_ATTACH
) &&
437 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
438 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
439 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
441 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
443 else if (smack_privileged_cred(CAP_SYS_PTRACE
, tracercred
))
449 smack_log(tracer_known
->smk_known
,
450 tracee_known
->smk_known
,
457 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
458 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
466 * We he, that is fun!
470 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
471 * @ctp: child task pointer
472 * @mode: ptrace attachment mode (PTRACE_MODE_*)
474 * Returns 0 if access is OK, an error code otherwise
476 * Do the capability checks.
478 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
480 struct smack_known
*skp
;
482 skp
= smk_of_task_struct(ctp
);
484 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
488 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
489 * @ptp: parent task pointer
491 * Returns 0 if access is OK, an error code otherwise
493 * Do the capability checks, and require PTRACE_MODE_ATTACH.
495 static int smack_ptrace_traceme(struct task_struct
*ptp
)
498 struct smack_known
*skp
;
500 skp
= smk_of_task(smack_cred(current_cred()));
502 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
507 * smack_syslog - Smack approval on syslog
508 * @typefrom_file: unused
510 * Returns 0 on success, error code otherwise.
512 static int smack_syslog(int typefrom_file
)
515 struct smack_known
*skp
= smk_of_current();
517 if (smack_privileged(CAP_MAC_OVERRIDE
))
520 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
531 * smack_sb_alloc_security - allocate a superblock blob
532 * @sb: the superblock getting the blob
534 * Returns 0 on success or -ENOMEM on error.
536 static int smack_sb_alloc_security(struct super_block
*sb
)
538 struct superblock_smack
*sbsp
;
540 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
545 sbsp
->smk_root
= &smack_known_floor
;
546 sbsp
->smk_default
= &smack_known_floor
;
547 sbsp
->smk_floor
= &smack_known_floor
;
548 sbsp
->smk_hat
= &smack_known_hat
;
550 * SMK_SB_INITIALIZED will be zero from kzalloc.
552 sb
->s_security
= sbsp
;
558 * smack_sb_free_security - free a superblock blob
559 * @sb: the superblock getting the blob
562 static void smack_sb_free_security(struct super_block
*sb
)
564 kfree(sb
->s_security
);
565 sb
->s_security
= NULL
;
568 struct smack_mnt_opts
{
569 const char *fsdefault
, *fsfloor
, *fshat
, *fsroot
, *fstransmute
;
572 static void smack_free_mnt_opts(void *mnt_opts
)
574 struct smack_mnt_opts
*opts
= mnt_opts
;
575 kfree(opts
->fsdefault
);
576 kfree(opts
->fsfloor
);
579 kfree(opts
->fstransmute
);
583 static int smack_add_opt(int token
, const char *s
, void **mnt_opts
)
585 struct smack_mnt_opts
*opts
= *mnt_opts
;
588 opts
= kzalloc(sizeof(struct smack_mnt_opts
), GFP_KERNEL
);
617 case Opt_fstransmute
:
618 if (opts
->fstransmute
)
620 opts
->fstransmute
= s
;
626 pr_warn("Smack: duplicate mount options\n");
631 * smack_fs_context_dup - Duplicate the security data on fs_context duplication
632 * @fc: The new filesystem context.
633 * @src_fc: The source filesystem context being duplicated.
635 * Returns 0 on success or -ENOMEM on error.
637 static int smack_fs_context_dup(struct fs_context
*fc
,
638 struct fs_context
*src_fc
)
640 struct smack_mnt_opts
*dst
, *src
= src_fc
->security
;
645 fc
->security
= kzalloc(sizeof(struct smack_mnt_opts
), GFP_KERNEL
);
650 if (src
->fsdefault
) {
651 dst
->fsdefault
= kstrdup(src
->fsdefault
, GFP_KERNEL
);
656 dst
->fsfloor
= kstrdup(src
->fsfloor
, GFP_KERNEL
);
661 dst
->fshat
= kstrdup(src
->fshat
, GFP_KERNEL
);
666 dst
->fsroot
= kstrdup(src
->fsroot
, GFP_KERNEL
);
670 if (src
->fstransmute
) {
671 dst
->fstransmute
= kstrdup(src
->fstransmute
, GFP_KERNEL
);
672 if (!dst
->fstransmute
)
678 static const struct fs_parameter_spec smack_fs_parameters
[] = {
679 fsparam_string("smackfsdef", Opt_fsdefault
),
680 fsparam_string("smackfsdefault", Opt_fsdefault
),
681 fsparam_string("smackfsfloor", Opt_fsfloor
),
682 fsparam_string("smackfshat", Opt_fshat
),
683 fsparam_string("smackfsroot", Opt_fsroot
),
684 fsparam_string("smackfstransmute", Opt_fstransmute
),
689 * smack_fs_context_parse_param - Parse a single mount parameter
690 * @fc: The new filesystem context being constructed.
691 * @param: The parameter.
693 * Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on
696 static int smack_fs_context_parse_param(struct fs_context
*fc
,
697 struct fs_parameter
*param
)
699 struct fs_parse_result result
;
702 opt
= fs_parse(fc
, smack_fs_parameters
, param
, &result
);
706 rc
= smack_add_opt(opt
, param
->string
, &fc
->security
);
708 param
->string
= NULL
;
712 static int smack_sb_eat_lsm_opts(char *options
, void **mnt_opts
)
714 char *from
= options
, *to
= options
;
718 char *next
= strchr(from
, ',');
727 token
= match_opt_prefix(from
, len
, &arg
);
728 if (token
!= Opt_error
) {
729 arg
= kmemdup_nul(arg
, from
+ len
- arg
, GFP_KERNEL
);
730 rc
= smack_add_opt(token
, arg
, mnt_opts
);
734 smack_free_mnt_opts(*mnt_opts
);
739 if (!first
) { // copy with preceding comma
744 memmove(to
, from
, len
);
757 * smack_set_mnt_opts - set Smack specific mount options
758 * @sb: the file system superblock
759 * @mnt_opts: Smack mount options
760 * @kern_flags: mount option from kernel space or user space
761 * @set_kern_flags: where to store converted mount opts
763 * Returns 0 on success, an error code on failure
765 * Allow filesystems with binary mount data to explicitly set Smack mount
768 static int smack_set_mnt_opts(struct super_block
*sb
,
770 unsigned long kern_flags
,
771 unsigned long *set_kern_flags
)
773 struct dentry
*root
= sb
->s_root
;
774 struct inode
*inode
= d_backing_inode(root
);
775 struct superblock_smack
*sp
= sb
->s_security
;
776 struct inode_smack
*isp
;
777 struct smack_known
*skp
;
778 struct smack_mnt_opts
*opts
= mnt_opts
;
779 bool transmute
= false;
781 if (sp
->smk_flags
& SMK_SB_INITIALIZED
)
784 if (inode
->i_security
== NULL
) {
785 int rc
= lsm_inode_alloc(inode
);
791 if (!smack_privileged(CAP_MAC_ADMIN
)) {
793 * Unprivileged mounts don't get to specify Smack values.
798 * Unprivileged mounts get root and default from the caller.
800 skp
= smk_of_current();
802 sp
->smk_default
= skp
;
804 * For a handful of fs types with no user-controlled
805 * backing store it's okay to trust security labels
806 * in the filesystem. The rest are untrusted.
808 if (sb
->s_user_ns
!= &init_user_ns
&&
809 sb
->s_magic
!= SYSFS_MAGIC
&& sb
->s_magic
!= TMPFS_MAGIC
&&
810 sb
->s_magic
!= RAMFS_MAGIC
) {
812 sp
->smk_flags
|= SMK_SB_UNTRUSTED
;
816 sp
->smk_flags
|= SMK_SB_INITIALIZED
;
819 if (opts
->fsdefault
) {
820 skp
= smk_import_entry(opts
->fsdefault
, 0);
823 sp
->smk_default
= skp
;
826 skp
= smk_import_entry(opts
->fsfloor
, 0);
832 skp
= smk_import_entry(opts
->fshat
, 0);
838 skp
= smk_import_entry(opts
->fsroot
, 0);
843 if (opts
->fstransmute
) {
844 skp
= smk_import_entry(opts
->fstransmute
, 0);
853 * Initialize the root inode.
855 init_inode_smack(inode
, sp
->smk_root
);
858 isp
= smack_inode(inode
);
859 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
866 * smack_sb_statfs - Smack check on statfs
867 * @dentry: identifies the file system in question
869 * Returns 0 if current can read the floor of the filesystem,
870 * and error code otherwise
872 static int smack_sb_statfs(struct dentry
*dentry
)
874 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
876 struct smk_audit_info ad
;
878 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
879 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
881 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
882 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
891 * smack_bprm_creds_for_exec - Update bprm->cred if needed for exec
892 * @bprm: the exec information
894 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
896 static int smack_bprm_creds_for_exec(struct linux_binprm
*bprm
)
898 struct inode
*inode
= file_inode(bprm
->file
);
899 struct task_smack
*bsp
= smack_cred(bprm
->cred
);
900 struct inode_smack
*isp
;
901 struct superblock_smack
*sbsp
;
904 isp
= smack_inode(inode
);
905 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
908 sbsp
= inode
->i_sb
->s_security
;
909 if ((sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) &&
910 isp
->smk_task
!= sbsp
->smk_root
)
913 if (bprm
->unsafe
& LSM_UNSAFE_PTRACE
) {
914 struct task_struct
*tracer
;
918 tracer
= ptrace_parent(current
);
919 if (likely(tracer
!= NULL
))
920 rc
= smk_ptrace_rule_check(tracer
,
929 if (bprm
->unsafe
& ~LSM_UNSAFE_PTRACE
)
932 bsp
->smk_task
= isp
->smk_task
;
933 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
935 /* Decide if this is a secure exec. */
936 if (bsp
->smk_task
!= bsp
->smk_forked
)
937 bprm
->secureexec
= 1;
947 * smack_inode_alloc_security - allocate an inode blob
948 * @inode: the inode in need of a blob
952 static int smack_inode_alloc_security(struct inode
*inode
)
954 struct smack_known
*skp
= smk_of_current();
956 init_inode_smack(inode
, skp
);
961 * smack_inode_init_security - copy out the smack from an inode
962 * @inode: the newly created inode
963 * @dir: containing directory object
965 * @name: where to put the attribute name
966 * @value: where to put the attribute value
967 * @len: where to put the length of the attribute
969 * Returns 0 if it all works out, -ENOMEM if there's no memory
971 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
972 const struct qstr
*qstr
, const char **name
,
973 void **value
, size_t *len
)
975 struct inode_smack
*issp
= smack_inode(inode
);
976 struct smack_known
*skp
= smk_of_current();
977 struct smack_known
*isp
= smk_of_inode(inode
);
978 struct smack_known
*dsp
= smk_of_inode(dir
);
982 *name
= XATTR_SMACK_SUFFIX
;
986 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
991 * If the access rule allows transmutation and
992 * the directory requests transmutation then
993 * by all means transmute.
994 * Mark the inode as changed.
996 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
997 smk_inode_transmutable(dir
)) {
999 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1002 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1006 *len
= strlen(isp
->smk_known
);
1013 * smack_inode_link - Smack check on link
1014 * @old_dentry: the existing object
1016 * @new_dentry: the new object
1018 * Returns 0 if access is permitted, an error code otherwise
1020 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1021 struct dentry
*new_dentry
)
1023 struct smack_known
*isp
;
1024 struct smk_audit_info ad
;
1027 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1028 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1030 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1031 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1032 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1034 if (rc
== 0 && d_is_positive(new_dentry
)) {
1035 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1036 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1037 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1038 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1045 * smack_inode_unlink - Smack check on inode deletion
1046 * @dir: containing directory object
1047 * @dentry: file to unlink
1049 * Returns 0 if current can write the containing directory
1050 * and the object, error code otherwise
1052 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1054 struct inode
*ip
= d_backing_inode(dentry
);
1055 struct smk_audit_info ad
;
1058 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1059 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1062 * You need write access to the thing you're unlinking
1064 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1065 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1068 * You also need write access to the containing directory
1070 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1071 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1072 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1073 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1079 * smack_inode_rmdir - Smack check on directory deletion
1080 * @dir: containing directory object
1081 * @dentry: directory to unlink
1083 * Returns 0 if current can write the containing directory
1084 * and the directory, error code otherwise
1086 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1088 struct smk_audit_info ad
;
1091 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1092 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1095 * You need write access to the thing you're removing
1097 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1098 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1101 * You also need write access to the containing directory
1103 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1104 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1105 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1106 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1113 * smack_inode_rename - Smack check on rename
1114 * @old_inode: unused
1115 * @old_dentry: the old object
1116 * @new_inode: unused
1117 * @new_dentry: the new object
1119 * Read and write access is required on both the old and
1122 * Returns 0 if access is permitted, an error code otherwise
1124 static int smack_inode_rename(struct inode
*old_inode
,
1125 struct dentry
*old_dentry
,
1126 struct inode
*new_inode
,
1127 struct dentry
*new_dentry
)
1130 struct smack_known
*isp
;
1131 struct smk_audit_info ad
;
1133 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1134 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1136 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1137 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1138 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1140 if (rc
== 0 && d_is_positive(new_dentry
)) {
1141 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1142 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1143 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1144 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1150 * smack_inode_permission - Smack version of permission()
1151 * @inode: the inode in question
1152 * @mask: the access requested
1154 * This is the important Smack hook.
1156 * Returns 0 if access is permitted, an error code otherwise
1158 static int smack_inode_permission(struct inode
*inode
, int mask
)
1160 struct superblock_smack
*sbsp
= inode
->i_sb
->s_security
;
1161 struct smk_audit_info ad
;
1162 int no_block
= mask
& MAY_NOT_BLOCK
;
1165 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1167 * No permission to check. Existence test. Yup, it's there.
1172 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
) {
1173 if (smk_of_inode(inode
) != sbsp
->smk_root
)
1177 /* May be droppable after audit */
1180 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1181 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1182 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1183 rc
= smk_bu_inode(inode
, mask
, rc
);
1188 * smack_inode_setattr - Smack check for setting attributes
1189 * @dentry: the object
1190 * @iattr: for the force flag
1192 * Returns 0 if access is permitted, an error code otherwise
1194 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1196 struct smk_audit_info ad
;
1200 * Need to allow for clearing the setuid bit.
1202 if (iattr
->ia_valid
& ATTR_FORCE
)
1204 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1205 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1207 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1208 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1213 * smack_inode_getattr - Smack check for getting attributes
1214 * @path: path to extract the info from
1216 * Returns 0 if access is permitted, an error code otherwise
1218 static int smack_inode_getattr(const struct path
*path
)
1220 struct smk_audit_info ad
;
1221 struct inode
*inode
= d_backing_inode(path
->dentry
);
1224 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1225 smk_ad_setfield_u_fs_path(&ad
, *path
);
1226 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1227 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1232 * smack_inode_setxattr - Smack check for setting xattrs
1233 * @dentry: the object
1234 * @name: name of the attribute
1235 * @value: value of the attribute
1236 * @size: size of the value
1239 * This protects the Smack attribute explicitly.
1241 * Returns 0 if access is permitted, an error code otherwise
1243 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1244 const void *value
, size_t size
, int flags
)
1246 struct smk_audit_info ad
;
1247 struct smack_known
*skp
;
1249 int check_import
= 0;
1254 * Check label validity here so import won't fail in post_setxattr
1256 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1257 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1258 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1261 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1262 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1266 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1268 if (size
!= TRANS_TRUE_SIZE
||
1269 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1272 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1274 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1277 if (rc
== 0 && check_import
) {
1278 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1281 else if (skp
== NULL
|| (check_star
&&
1282 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1286 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1287 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1290 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1291 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1298 * smack_inode_post_setxattr - Apply the Smack update approved above
1300 * @name: attribute name
1301 * @value: attribute value
1302 * @size: attribute size
1305 * Set the pointer in the inode blob to the entry found
1306 * in the master label list.
1308 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1309 const void *value
, size_t size
, int flags
)
1311 struct smack_known
*skp
;
1312 struct inode_smack
*isp
= smack_inode(d_backing_inode(dentry
));
1314 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1315 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1319 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1320 skp
= smk_import_entry(value
, size
);
1322 isp
->smk_inode
= skp
;
1323 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1324 skp
= smk_import_entry(value
, size
);
1326 isp
->smk_task
= skp
;
1327 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1328 skp
= smk_import_entry(value
, size
);
1330 isp
->smk_mmap
= skp
;
1337 * smack_inode_getxattr - Smack check on getxattr
1338 * @dentry: the object
1341 * Returns 0 if access is permitted, an error code otherwise
1343 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1345 struct smk_audit_info ad
;
1348 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1349 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1351 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1352 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1357 * smack_inode_removexattr - Smack check on removexattr
1358 * @dentry: the object
1359 * @name: name of the attribute
1361 * Removing the Smack attribute requires CAP_MAC_ADMIN
1363 * Returns 0 if access is permitted, an error code otherwise
1365 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1367 struct inode_smack
*isp
;
1368 struct smk_audit_info ad
;
1371 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1372 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1373 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1374 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1375 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1376 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1377 if (!smack_privileged(CAP_MAC_ADMIN
))
1380 rc
= cap_inode_removexattr(dentry
, name
);
1385 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1386 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1388 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1389 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1393 isp
= smack_inode(d_backing_inode(dentry
));
1395 * Don't do anything special for these.
1396 * XATTR_NAME_SMACKIPIN
1397 * XATTR_NAME_SMACKIPOUT
1399 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1400 struct super_block
*sbp
= dentry
->d_sb
;
1401 struct superblock_smack
*sbsp
= sbp
->s_security
;
1403 isp
->smk_inode
= sbsp
->smk_default
;
1404 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0)
1405 isp
->smk_task
= NULL
;
1406 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1407 isp
->smk_mmap
= NULL
;
1408 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1409 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1415 * smack_inode_getsecurity - get smack xattrs
1416 * @inode: the object
1417 * @name: attribute name
1418 * @buffer: where to put the result
1419 * @alloc: duplicate memory
1421 * Returns the size of the attribute or an error code
1423 static int smack_inode_getsecurity(struct inode
*inode
,
1424 const char *name
, void **buffer
,
1427 struct socket_smack
*ssp
;
1428 struct socket
*sock
;
1429 struct super_block
*sbp
;
1430 struct inode
*ip
= (struct inode
*)inode
;
1431 struct smack_known
*isp
;
1433 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0)
1434 isp
= smk_of_inode(inode
);
1437 * The rest of the Smack xattrs are only on sockets.
1440 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1443 sock
= SOCKET_I(ip
);
1444 if (sock
== NULL
|| sock
->sk
== NULL
)
1447 ssp
= sock
->sk
->sk_security
;
1449 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1451 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1458 *buffer
= kstrdup(isp
->smk_known
, GFP_KERNEL
);
1459 if (*buffer
== NULL
)
1463 return strlen(isp
->smk_known
);
1468 * smack_inode_listsecurity - list the Smack attributes
1469 * @inode: the object
1470 * @buffer: where they go
1471 * @buffer_size: size of buffer
1473 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1476 int len
= sizeof(XATTR_NAME_SMACK
);
1478 if (buffer
!= NULL
&& len
<= buffer_size
)
1479 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1485 * smack_inode_getsecid - Extract inode's security id
1486 * @inode: inode to extract the info from
1487 * @secid: where result will be saved
1489 static void smack_inode_getsecid(struct inode
*inode
, u32
*secid
)
1491 struct smack_known
*skp
= smk_of_inode(inode
);
1493 *secid
= skp
->smk_secid
;
1501 * There is no smack_file_permission hook
1503 * Should access checks be done on each read or write?
1504 * UNICOS and SELinux say yes.
1505 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1507 * I'll say no for now. Smack does not do the frequent
1508 * label changing that SELinux does.
1512 * smack_file_alloc_security - assign a file security blob
1515 * The security blob for a file is a pointer to the master
1516 * label list, so no allocation is done.
1518 * f_security is the owner security information. It
1519 * isn't used on file access checks, it's for send_sigio.
1523 static int smack_file_alloc_security(struct file
*file
)
1525 struct smack_known
**blob
= smack_file(file
);
1527 *blob
= smk_of_current();
1532 * smack_file_ioctl - Smack check on ioctls
1537 * Relies heavily on the correct use of the ioctl command conventions.
1539 * Returns 0 if allowed, error code otherwise
1541 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1545 struct smk_audit_info ad
;
1546 struct inode
*inode
= file_inode(file
);
1548 if (unlikely(IS_PRIVATE(inode
)))
1551 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1552 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1554 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1555 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1556 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1559 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1560 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1561 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1568 * smack_file_lock - Smack check on file locking
1572 * Returns 0 if current has lock access, error code otherwise
1574 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1576 struct smk_audit_info ad
;
1578 struct inode
*inode
= file_inode(file
);
1580 if (unlikely(IS_PRIVATE(inode
)))
1583 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1584 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1585 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1586 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1591 * smack_file_fcntl - Smack check on fcntl
1593 * @cmd: what action to check
1596 * Generally these operations are harmless.
1597 * File locking operations present an obvious mechanism
1598 * for passing information, so they require write access.
1600 * Returns 0 if current has access, error code otherwise
1602 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1605 struct smk_audit_info ad
;
1607 struct inode
*inode
= file_inode(file
);
1609 if (unlikely(IS_PRIVATE(inode
)))
1617 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1618 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1619 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1620 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1624 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1625 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1626 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1627 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1638 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1639 * if mapping anonymous memory.
1640 * @file contains the file structure for file to map (may be NULL).
1641 * @reqprot contains the protection requested by the application.
1642 * @prot contains the protection that will be applied by the kernel.
1643 * @flags contains the operational flags.
1644 * Return 0 if permission is granted.
1646 static int smack_mmap_file(struct file
*file
,
1647 unsigned long reqprot
, unsigned long prot
,
1648 unsigned long flags
)
1650 struct smack_known
*skp
;
1651 struct smack_known
*mkp
;
1652 struct smack_rule
*srp
;
1653 struct task_smack
*tsp
;
1654 struct smack_known
*okp
;
1655 struct inode_smack
*isp
;
1656 struct superblock_smack
*sbsp
;
1665 if (unlikely(IS_PRIVATE(file_inode(file
))))
1668 isp
= smack_inode(file_inode(file
));
1669 if (isp
->smk_mmap
== NULL
)
1671 sbsp
= file_inode(file
)->i_sb
->s_security
;
1672 if (sbsp
->smk_flags
& SMK_SB_UNTRUSTED
&&
1673 isp
->smk_mmap
!= sbsp
->smk_root
)
1675 mkp
= isp
->smk_mmap
;
1677 tsp
= smack_cred(current_cred());
1678 skp
= smk_of_current();
1683 * For each Smack rule associated with the subject
1684 * label verify that the SMACK64MMAP also has access
1685 * to that rule's object label.
1687 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1688 okp
= srp
->smk_object
;
1690 * Matching labels always allows access.
1692 if (mkp
->smk_known
== okp
->smk_known
)
1695 * If there is a matching local rule take
1696 * that into account as well.
1698 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1702 may
= srp
->smk_access
;
1704 may
&= srp
->smk_access
;
1706 * If may is zero the SMACK64MMAP subject can't
1707 * possibly have less access.
1713 * Fetch the global list entry.
1714 * If there isn't one a SMACK64MMAP subject
1715 * can't have as much access as current.
1717 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1719 if (mmay
== -ENOENT
) {
1724 * If there is a local entry it modifies the
1725 * potential access, too.
1727 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1729 if (tmay
!= -ENOENT
)
1733 * If there is any access available to current that is
1734 * not available to a SMACK64MMAP subject
1737 if ((may
| mmay
) != mmay
) {
1749 * smack_file_set_fowner - set the file security blob value
1750 * @file: object in question
1753 static void smack_file_set_fowner(struct file
*file
)
1755 struct smack_known
**blob
= smack_file(file
);
1757 *blob
= smk_of_current();
1761 * smack_file_send_sigiotask - Smack on sigio
1762 * @tsk: The target task
1763 * @fown: the object the signal come from
1766 * Allow a privileged task to get signals even if it shouldn't
1768 * Returns 0 if a subject with the object's smack could
1769 * write to the task, an error code otherwise.
1771 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1772 struct fown_struct
*fown
, int signum
)
1774 struct smack_known
**blob
;
1775 struct smack_known
*skp
;
1776 struct smack_known
*tkp
= smk_of_task(smack_cred(tsk
->cred
));
1777 const struct cred
*tcred
;
1780 struct smk_audit_info ad
;
1783 * struct fown_struct is never outside the context of a struct file
1785 file
= container_of(fown
, struct file
, f_owner
);
1787 /* we don't log here as rc can be overriden */
1788 blob
= smack_file(file
);
1790 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, NULL
);
1791 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_DELIVER
, rc
);
1794 tcred
= __task_cred(tsk
);
1795 if (rc
!= 0 && smack_privileged_cred(CAP_MAC_OVERRIDE
, tcred
))
1799 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1800 smk_ad_setfield_u_tsk(&ad
, tsk
);
1801 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_DELIVER
, rc
, &ad
);
1806 * smack_file_receive - Smack file receive check
1809 * Returns 0 if current has access, error code otherwise
1811 static int smack_file_receive(struct file
*file
)
1815 struct smk_audit_info ad
;
1816 struct inode
*inode
= file_inode(file
);
1817 struct socket
*sock
;
1818 struct task_smack
*tsp
;
1819 struct socket_smack
*ssp
;
1821 if (unlikely(IS_PRIVATE(inode
)))
1824 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1825 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1827 if (inode
->i_sb
->s_magic
== SOCKFS_MAGIC
) {
1828 sock
= SOCKET_I(inode
);
1829 ssp
= sock
->sk
->sk_security
;
1830 tsp
= smack_cred(current_cred());
1832 * If the receiving process can't write to the
1833 * passed socket or if the passed socket can't
1834 * write to the receiving process don't accept
1835 * the passed socket.
1837 rc
= smk_access(tsp
->smk_task
, ssp
->smk_out
, MAY_WRITE
, &ad
);
1838 rc
= smk_bu_file(file
, may
, rc
);
1841 rc
= smk_access(ssp
->smk_in
, tsp
->smk_task
, MAY_WRITE
, &ad
);
1842 rc
= smk_bu_file(file
, may
, rc
);
1846 * This code relies on bitmasks.
1848 if (file
->f_mode
& FMODE_READ
)
1850 if (file
->f_mode
& FMODE_WRITE
)
1853 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1854 rc
= smk_bu_file(file
, may
, rc
);
1859 * smack_file_open - Smack dentry open processing
1862 * Set the security blob in the file structure.
1863 * Allow the open only if the task has read access. There are
1864 * many read operations (e.g. fstat) that you can do with an
1865 * fd even if you have the file open write-only.
1867 * Returns 0 if current has access, error code otherwise
1869 static int smack_file_open(struct file
*file
)
1871 struct task_smack
*tsp
= smack_cred(file
->f_cred
);
1872 struct inode
*inode
= file_inode(file
);
1873 struct smk_audit_info ad
;
1876 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1877 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1878 rc
= smk_tskacc(tsp
, smk_of_inode(inode
), MAY_READ
, &ad
);
1879 rc
= smk_bu_credfile(file
->f_cred
, file
, MAY_READ
, rc
);
1889 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1890 * @cred: the new credentials
1891 * @gfp: the atomicity of any memory allocations
1893 * Prepare a blank set of credentials for modification. This must allocate all
1894 * the memory the LSM module might require such that cred_transfer() can
1895 * complete without error.
1897 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1899 init_task_smack(smack_cred(cred
), NULL
, NULL
);
1905 * smack_cred_free - "free" task-level security credentials
1906 * @cred: the credentials in question
1909 static void smack_cred_free(struct cred
*cred
)
1911 struct task_smack
*tsp
= smack_cred(cred
);
1912 struct smack_rule
*rp
;
1913 struct list_head
*l
;
1914 struct list_head
*n
;
1916 smk_destroy_label_list(&tsp
->smk_relabel
);
1918 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1919 rp
= list_entry(l
, struct smack_rule
, list
);
1920 list_del(&rp
->list
);
1921 kmem_cache_free(smack_rule_cache
, rp
);
1926 * smack_cred_prepare - prepare new set of credentials for modification
1927 * @new: the new credentials
1928 * @old: the original credentials
1929 * @gfp: the atomicity of any memory allocations
1931 * Prepare a new set of credentials for modification.
1933 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1936 struct task_smack
*old_tsp
= smack_cred(old
);
1937 struct task_smack
*new_tsp
= smack_cred(new);
1940 init_task_smack(new_tsp
, old_tsp
->smk_task
, old_tsp
->smk_task
);
1942 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1946 rc
= smk_copy_relabel(&new_tsp
->smk_relabel
, &old_tsp
->smk_relabel
,
1952 * smack_cred_transfer - Transfer the old credentials to the new credentials
1953 * @new: the new credentials
1954 * @old: the original credentials
1956 * Fill in a set of blank credentials from another set of credentials.
1958 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1960 struct task_smack
*old_tsp
= smack_cred(old
);
1961 struct task_smack
*new_tsp
= smack_cred(new);
1963 new_tsp
->smk_task
= old_tsp
->smk_task
;
1964 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1965 mutex_init(&new_tsp
->smk_rules_lock
);
1966 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1968 /* cbs copy rule list */
1972 * smack_cred_getsecid - get the secid corresponding to a creds structure
1973 * @cred: the object creds
1974 * @secid: where to put the result
1976 * Sets the secid to contain a u32 version of the smack label.
1978 static void smack_cred_getsecid(const struct cred
*cred
, u32
*secid
)
1980 struct smack_known
*skp
;
1983 skp
= smk_of_task(smack_cred(cred
));
1984 *secid
= skp
->smk_secid
;
1989 * smack_kernel_act_as - Set the subjective context in a set of credentials
1990 * @new: points to the set of credentials to be modified.
1991 * @secid: specifies the security ID to be set
1993 * Set the security data for a kernel service.
1995 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1997 struct task_smack
*new_tsp
= smack_cred(new);
1999 new_tsp
->smk_task
= smack_from_secid(secid
);
2004 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2005 * @new: points to the set of credentials to be modified
2006 * @inode: points to the inode to use as a reference
2008 * Set the file creation context in a set of credentials to the same
2009 * as the objective context of the specified inode
2011 static int smack_kernel_create_files_as(struct cred
*new,
2012 struct inode
*inode
)
2014 struct inode_smack
*isp
= smack_inode(inode
);
2015 struct task_smack
*tsp
= smack_cred(new);
2017 tsp
->smk_forked
= isp
->smk_inode
;
2018 tsp
->smk_task
= tsp
->smk_forked
;
2023 * smk_curacc_on_task - helper to log task related access
2024 * @p: the task object
2025 * @access: the access requested
2026 * @caller: name of the calling function for audit
2028 * Return 0 if access is permitted
2030 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2033 struct smk_audit_info ad
;
2034 struct smack_known
*skp
= smk_of_task_struct(p
);
2037 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2038 smk_ad_setfield_u_tsk(&ad
, p
);
2039 rc
= smk_curacc(skp
, access
, &ad
);
2040 rc
= smk_bu_task(p
, access
, rc
);
2045 * smack_task_setpgid - Smack check on setting pgid
2046 * @p: the task object
2049 * Return 0 if write access is permitted
2051 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2053 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2057 * smack_task_getpgid - Smack access check for getpgid
2058 * @p: the object task
2060 * Returns 0 if current can read the object task, error code otherwise
2062 static int smack_task_getpgid(struct task_struct
*p
)
2064 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2068 * smack_task_getsid - Smack access check for getsid
2069 * @p: the object task
2071 * Returns 0 if current can read the object task, error code otherwise
2073 static int smack_task_getsid(struct task_struct
*p
)
2075 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2079 * smack_task_getsecid - get the secid of the task
2080 * @p: the object task
2081 * @secid: where to put the result
2083 * Sets the secid to contain a u32 version of the smack label.
2085 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2087 struct smack_known
*skp
= smk_of_task_struct(p
);
2089 *secid
= skp
->smk_secid
;
2093 * smack_task_setnice - Smack check on setting nice
2094 * @p: the task object
2097 * Return 0 if write access is permitted
2099 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2101 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2105 * smack_task_setioprio - Smack check on setting ioprio
2106 * @p: the task object
2109 * Return 0 if write access is permitted
2111 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2113 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2117 * smack_task_getioprio - Smack check on reading ioprio
2118 * @p: the task object
2120 * Return 0 if read access is permitted
2122 static int smack_task_getioprio(struct task_struct
*p
)
2124 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2128 * smack_task_setscheduler - Smack check on setting scheduler
2129 * @p: the task object
2131 * Return 0 if read access is permitted
2133 static int smack_task_setscheduler(struct task_struct
*p
)
2135 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2139 * smack_task_getscheduler - Smack check on reading scheduler
2140 * @p: the task object
2142 * Return 0 if read access is permitted
2144 static int smack_task_getscheduler(struct task_struct
*p
)
2146 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2150 * smack_task_movememory - Smack check on moving memory
2151 * @p: the task object
2153 * Return 0 if write access is permitted
2155 static int smack_task_movememory(struct task_struct
*p
)
2157 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2161 * smack_task_kill - Smack check on signal delivery
2162 * @p: the task object
2165 * @cred: identifies the cred to use in lieu of current's
2167 * Return 0 if write access is permitted
2170 static int smack_task_kill(struct task_struct
*p
, struct kernel_siginfo
*info
,
2171 int sig
, const struct cred
*cred
)
2173 struct smk_audit_info ad
;
2174 struct smack_known
*skp
;
2175 struct smack_known
*tkp
= smk_of_task_struct(p
);
2179 return 0; /* null signal; existence test */
2181 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2182 smk_ad_setfield_u_tsk(&ad
, p
);
2184 * Sending a signal requires that the sender
2185 * can write the receiver.
2188 rc
= smk_curacc(tkp
, MAY_DELIVER
, &ad
);
2189 rc
= smk_bu_task(p
, MAY_DELIVER
, rc
);
2193 * If the cred isn't NULL we're dealing with some USB IO
2194 * specific behavior. This is not clean. For one thing
2195 * we can't take privilege into account.
2197 skp
= smk_of_task(smack_cred(cred
));
2198 rc
= smk_access(skp
, tkp
, MAY_DELIVER
, &ad
);
2199 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_DELIVER
, rc
);
2204 * smack_task_to_inode - copy task smack into the inode blob
2205 * @p: task to copy from
2206 * @inode: inode to copy to
2208 * Sets the smack pointer in the inode security blob
2210 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2212 struct inode_smack
*isp
= smack_inode(inode
);
2213 struct smack_known
*skp
= smk_of_task_struct(p
);
2215 isp
->smk_inode
= skp
;
2216 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2224 * smack_sk_alloc_security - Allocate a socket blob
2227 * @gfp_flags: memory allocation flags
2229 * Assign Smack pointers to current
2231 * Returns 0 on success, -ENOMEM is there's no memory
2233 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2235 struct smack_known
*skp
= smk_of_current();
2236 struct socket_smack
*ssp
;
2238 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2243 * Sockets created by kernel threads receive web label.
2245 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2246 ssp
->smk_in
= &smack_known_web
;
2247 ssp
->smk_out
= &smack_known_web
;
2252 ssp
->smk_packet
= NULL
;
2254 sk
->sk_security
= ssp
;
2260 * smack_sk_free_security - Free a socket blob
2263 * Clears the blob pointer
2265 static void smack_sk_free_security(struct sock
*sk
)
2267 #ifdef SMACK_IPV6_PORT_LABELING
2268 struct smk_port_label
*spp
;
2270 if (sk
->sk_family
== PF_INET6
) {
2272 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2273 if (spp
->smk_sock
!= sk
)
2275 spp
->smk_can_reuse
= 1;
2281 kfree(sk
->sk_security
);
2285 * smack_ipv4host_label - check host based restrictions
2286 * @sip: the object end
2288 * looks for host based access restrictions
2290 * This version will only be appropriate for really small sets of single label
2291 * hosts. The caller is responsible for ensuring that the RCU read lock is
2292 * taken before calling this function.
2294 * Returns the label of the far end or NULL if it's not special.
2296 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2298 struct smk_net4addr
*snp
;
2299 struct in_addr
*siap
= &sip
->sin_addr
;
2301 if (siap
->s_addr
== 0)
2304 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2306 * we break after finding the first match because
2307 * the list is sorted from longest to shortest mask
2308 * so we have found the most specific match
2310 if (snp
->smk_host
.s_addr
==
2311 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2312 return snp
->smk_label
;
2318 * smk_ipv6_localhost - Check for local ipv6 host address
2321 * Returns boolean true if this is the localhost address
2323 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2325 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2326 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2328 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2329 ntohs(be16p
[7]) == 1)
2335 * smack_ipv6host_label - check host based restrictions
2336 * @sip: the object end
2338 * looks for host based access restrictions
2340 * This version will only be appropriate for really small sets of single label
2341 * hosts. The caller is responsible for ensuring that the RCU read lock is
2342 * taken before calling this function.
2344 * Returns the label of the far end or NULL if it's not special.
2346 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2348 struct smk_net6addr
*snp
;
2349 struct in6_addr
*sap
= &sip
->sin6_addr
;
2354 * It's local. Don't look for a host label.
2356 if (smk_ipv6_localhost(sip
))
2359 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2361 * If the label is NULL the entry has
2362 * been renounced. Ignore it.
2364 if (snp
->smk_label
== NULL
)
2367 * we break after finding the first match because
2368 * the list is sorted from longest to shortest mask
2369 * so we have found the most specific match
2371 for (found
= 1, i
= 0; i
< 8; i
++) {
2372 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2373 snp
->smk_host
.s6_addr16
[i
]) {
2379 return snp
->smk_label
;
2386 * smack_netlbl_add - Set the secattr on a socket
2389 * Attach the outbound smack value (smk_out) to the socket.
2391 * Returns 0 on success or an error code
2393 static int smack_netlbl_add(struct sock
*sk
)
2395 struct socket_smack
*ssp
= sk
->sk_security
;
2396 struct smack_known
*skp
= ssp
->smk_out
;
2400 bh_lock_sock_nested(sk
);
2402 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2405 ssp
->smk_state
= SMK_NETLBL_LABELED
;
2408 ssp
->smk_state
= SMK_NETLBL_REQSKB
;
2420 * smack_netlbl_delete - Remove the secattr from a socket
2423 * Remove the outbound smack value from a socket
2425 static void smack_netlbl_delete(struct sock
*sk
)
2427 struct socket_smack
*ssp
= sk
->sk_security
;
2430 * Take the label off the socket if one is set.
2432 if (ssp
->smk_state
!= SMK_NETLBL_LABELED
)
2436 bh_lock_sock_nested(sk
);
2437 netlbl_sock_delattr(sk
);
2440 ssp
->smk_state
= SMK_NETLBL_UNLABELED
;
2444 * smk_ipv4_check - Perform IPv4 host access checks
2446 * @sap: the destination address
2448 * Set the correct secattr for the given socket based on the destination
2449 * address and perform any outbound access checks needed.
2451 * Returns 0 on success or an error code.
2454 static int smk_ipv4_check(struct sock
*sk
, struct sockaddr_in
*sap
)
2456 struct smack_known
*skp
;
2458 struct smack_known
*hkp
;
2459 struct socket_smack
*ssp
= sk
->sk_security
;
2460 struct smk_audit_info ad
;
2463 hkp
= smack_ipv4host_label(sap
);
2466 struct lsm_network_audit net
;
2468 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2469 ad
.a
.u
.net
->family
= sap
->sin_family
;
2470 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2471 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2474 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2475 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2477 * Clear the socket netlabel if it's set.
2480 smack_netlbl_delete(sk
);
2488 * smk_ipv6_check - check Smack access
2489 * @subject: subject Smack label
2490 * @object: object Smack label
2492 * @act: the action being taken
2494 * Check an IPv6 access
2496 static int smk_ipv6_check(struct smack_known
*subject
,
2497 struct smack_known
*object
,
2498 struct sockaddr_in6
*address
, int act
)
2501 struct lsm_network_audit net
;
2503 struct smk_audit_info ad
;
2507 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2508 ad
.a
.u
.net
->family
= PF_INET6
;
2509 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2510 if (act
== SMK_RECEIVING
)
2511 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2513 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2515 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2516 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2520 #ifdef SMACK_IPV6_PORT_LABELING
2522 * smk_ipv6_port_label - Smack port access table management
2526 * Create or update the port list entry
2528 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2530 struct sock
*sk
= sock
->sk
;
2531 struct sockaddr_in6
*addr6
;
2532 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2533 struct smk_port_label
*spp
;
2534 unsigned short port
= 0;
2536 if (address
== NULL
) {
2538 * This operation is changing the Smack information
2539 * on the bound socket. Take the changes to the port
2543 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2544 if (sk
!= spp
->smk_sock
)
2546 spp
->smk_in
= ssp
->smk_in
;
2547 spp
->smk_out
= ssp
->smk_out
;
2552 * A NULL address is only used for updating existing
2553 * bound entries. If there isn't one, it's OK.
2559 addr6
= (struct sockaddr_in6
*)address
;
2560 port
= ntohs(addr6
->sin6_port
);
2562 * This is a special case that is safely ignored.
2568 * Look for an existing port list entry.
2569 * This is an indication that a port is getting reused.
2572 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2573 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sock
->type
)
2575 if (spp
->smk_can_reuse
!= 1) {
2579 spp
->smk_port
= port
;
2581 spp
->smk_in
= ssp
->smk_in
;
2582 spp
->smk_out
= ssp
->smk_out
;
2583 spp
->smk_can_reuse
= 0;
2589 * A new port entry is required.
2591 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2595 spp
->smk_port
= port
;
2597 spp
->smk_in
= ssp
->smk_in
;
2598 spp
->smk_out
= ssp
->smk_out
;
2599 spp
->smk_sock_type
= sock
->type
;
2600 spp
->smk_can_reuse
= 0;
2602 mutex_lock(&smack_ipv6_lock
);
2603 list_add_rcu(&spp
->list
, &smk_ipv6_port_list
);
2604 mutex_unlock(&smack_ipv6_lock
);
2610 * smk_ipv6_port_check - check Smack port access
2613 * @act: the action being taken
2615 * Create or update the port list entry
2617 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2620 struct smk_port_label
*spp
;
2621 struct socket_smack
*ssp
= sk
->sk_security
;
2622 struct smack_known
*skp
= NULL
;
2623 unsigned short port
;
2624 struct smack_known
*object
;
2626 if (act
== SMK_RECEIVING
) {
2627 skp
= smack_ipv6host_label(address
);
2628 object
= ssp
->smk_in
;
2631 object
= smack_ipv6host_label(address
);
2635 * The other end is a single label host.
2637 if (skp
!= NULL
&& object
!= NULL
)
2638 return smk_ipv6_check(skp
, object
, address
, act
);
2640 skp
= smack_net_ambient
;
2642 object
= smack_net_ambient
;
2645 * It's remote, so port lookup does no good.
2647 if (!smk_ipv6_localhost(address
))
2648 return smk_ipv6_check(skp
, object
, address
, act
);
2651 * It's local so the send check has to have passed.
2653 if (act
== SMK_RECEIVING
)
2656 port
= ntohs(address
->sin6_port
);
2658 list_for_each_entry_rcu(spp
, &smk_ipv6_port_list
, list
) {
2659 if (spp
->smk_port
!= port
|| spp
->smk_sock_type
!= sk
->sk_type
)
2661 object
= spp
->smk_in
;
2662 if (act
== SMK_CONNECTING
)
2663 ssp
->smk_packet
= spp
->smk_out
;
2668 return smk_ipv6_check(skp
, object
, address
, act
);
2672 * smack_inode_setsecurity - set smack xattrs
2673 * @inode: the object
2674 * @name: attribute name
2675 * @value: attribute value
2676 * @size: size of the attribute
2679 * Sets the named attribute in the appropriate blob
2681 * Returns 0 on success, or an error code
2683 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2684 const void *value
, size_t size
, int flags
)
2686 struct smack_known
*skp
;
2687 struct inode_smack
*nsp
= smack_inode(inode
);
2688 struct socket_smack
*ssp
;
2689 struct socket
*sock
;
2692 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2695 skp
= smk_import_entry(value
, size
);
2697 return PTR_ERR(skp
);
2699 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2700 nsp
->smk_inode
= skp
;
2701 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2705 * The rest of the Smack xattrs are only on sockets.
2707 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2710 sock
= SOCKET_I(inode
);
2711 if (sock
== NULL
|| sock
->sk
== NULL
)
2714 ssp
= sock
->sk
->sk_security
;
2716 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2718 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2720 if (sock
->sk
->sk_family
== PF_INET
) {
2721 rc
= smack_netlbl_add(sock
->sk
);
2724 "Smack: \"%s\" netlbl error %d.\n",
2730 #ifdef SMACK_IPV6_PORT_LABELING
2731 if (sock
->sk
->sk_family
== PF_INET6
)
2732 smk_ipv6_port_label(sock
, NULL
);
2739 * smack_socket_post_create - finish socket setup
2741 * @family: protocol family
2746 * Sets the netlabel information on the socket
2748 * Returns 0 on success, and error code otherwise
2750 static int smack_socket_post_create(struct socket
*sock
, int family
,
2751 int type
, int protocol
, int kern
)
2753 struct socket_smack
*ssp
;
2755 if (sock
->sk
== NULL
)
2759 * Sockets created by kernel threads receive web label.
2761 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2762 ssp
= sock
->sk
->sk_security
;
2763 ssp
->smk_in
= &smack_known_web
;
2764 ssp
->smk_out
= &smack_known_web
;
2767 if (family
!= PF_INET
)
2770 * Set the outbound netlbl.
2772 return smack_netlbl_add(sock
->sk
);
2776 * smack_socket_socketpair - create socket pair
2777 * @socka: one socket
2778 * @sockb: another socket
2780 * Cross reference the peer labels for SO_PEERSEC
2784 static int smack_socket_socketpair(struct socket
*socka
,
2785 struct socket
*sockb
)
2787 struct socket_smack
*asp
= socka
->sk
->sk_security
;
2788 struct socket_smack
*bsp
= sockb
->sk
->sk_security
;
2790 asp
->smk_packet
= bsp
->smk_out
;
2791 bsp
->smk_packet
= asp
->smk_out
;
2796 #ifdef SMACK_IPV6_PORT_LABELING
2798 * smack_socket_bind - record port binding information.
2800 * @address: the port address
2801 * @addrlen: size of the address
2803 * Records the label bound to a port.
2805 * Returns 0 on success, and error code otherwise
2807 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2810 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
) {
2811 if (addrlen
< SIN6_LEN_RFC2133
||
2812 address
->sa_family
!= AF_INET6
)
2814 smk_ipv6_port_label(sock
, address
);
2818 #endif /* SMACK_IPV6_PORT_LABELING */
2821 * smack_socket_connect - connect access check
2823 * @sap: the other end
2824 * @addrlen: size of sap
2826 * Verifies that a connection may be possible
2828 * Returns 0 on success, and error code otherwise
2830 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2835 if (sock
->sk
== NULL
)
2837 if (sock
->sk
->sk_family
!= PF_INET
&&
2838 (!IS_ENABLED(CONFIG_IPV6
) || sock
->sk
->sk_family
!= PF_INET6
))
2840 if (addrlen
< offsetofend(struct sockaddr
, sa_family
))
2842 if (IS_ENABLED(CONFIG_IPV6
) && sap
->sa_family
== AF_INET6
) {
2843 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2844 struct smack_known
*rsp
= NULL
;
2846 if (addrlen
< SIN6_LEN_RFC2133
)
2848 if (__is_defined(SMACK_IPV6_SECMARK_LABELING
))
2849 rsp
= smack_ipv6host_label(sip
);
2851 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2853 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2856 if (__is_defined(SMACK_IPV6_PORT_LABELING
))
2857 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2861 if (sap
->sa_family
!= AF_INET
|| addrlen
< sizeof(struct sockaddr_in
))
2863 rc
= smk_ipv4_check(sock
->sk
, (struct sockaddr_in
*)sap
);
2868 * smack_flags_to_may - convert S_ to MAY_ values
2869 * @flags: the S_ value
2871 * Returns the equivalent MAY_ value
2873 static int smack_flags_to_may(int flags
)
2877 if (flags
& S_IRUGO
)
2879 if (flags
& S_IWUGO
)
2881 if (flags
& S_IXUGO
)
2888 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2893 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2895 struct smack_known
**blob
= smack_msg_msg(msg
);
2897 *blob
= smk_of_current();
2902 * smack_of_ipc - the smack pointer for the ipc
2905 * Returns a pointer to the smack value
2907 static struct smack_known
*smack_of_ipc(struct kern_ipc_perm
*isp
)
2909 struct smack_known
**blob
= smack_ipc(isp
);
2915 * smack_ipc_alloc_security - Set the security blob for ipc
2920 static int smack_ipc_alloc_security(struct kern_ipc_perm
*isp
)
2922 struct smack_known
**blob
= smack_ipc(isp
);
2924 *blob
= smk_of_current();
2929 * smk_curacc_shm : check if current has access on shm
2931 * @access : access requested
2933 * Returns 0 if current has the requested access, error code otherwise
2935 static int smk_curacc_shm(struct kern_ipc_perm
*isp
, int access
)
2937 struct smack_known
*ssp
= smack_of_ipc(isp
);
2938 struct smk_audit_info ad
;
2942 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2943 ad
.a
.u
.ipc_id
= isp
->id
;
2945 rc
= smk_curacc(ssp
, access
, &ad
);
2946 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2951 * smack_shm_associate - Smack access check for shm
2953 * @shmflg: access requested
2955 * Returns 0 if current has the requested access, error code otherwise
2957 static int smack_shm_associate(struct kern_ipc_perm
*isp
, int shmflg
)
2961 may
= smack_flags_to_may(shmflg
);
2962 return smk_curacc_shm(isp
, may
);
2966 * smack_shm_shmctl - Smack access check for shm
2968 * @cmd: what it wants to do
2970 * Returns 0 if current has the requested access, error code otherwise
2972 static int smack_shm_shmctl(struct kern_ipc_perm
*isp
, int cmd
)
2986 may
= MAY_READWRITE
;
2991 * System level information.
2997 return smk_curacc_shm(isp
, may
);
3001 * smack_shm_shmat - Smack access for shmat
3004 * @shmflg: access requested
3006 * Returns 0 if current has the requested access, error code otherwise
3008 static int smack_shm_shmat(struct kern_ipc_perm
*isp
, char __user
*shmaddr
,
3013 may
= smack_flags_to_may(shmflg
);
3014 return smk_curacc_shm(isp
, may
);
3018 * smk_curacc_sem : check if current has access on sem
3020 * @access : access requested
3022 * Returns 0 if current has the requested access, error code otherwise
3024 static int smk_curacc_sem(struct kern_ipc_perm
*isp
, int access
)
3026 struct smack_known
*ssp
= smack_of_ipc(isp
);
3027 struct smk_audit_info ad
;
3031 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3032 ad
.a
.u
.ipc_id
= isp
->id
;
3034 rc
= smk_curacc(ssp
, access
, &ad
);
3035 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3040 * smack_sem_associate - Smack access check for sem
3042 * @semflg: access requested
3044 * Returns 0 if current has the requested access, error code otherwise
3046 static int smack_sem_associate(struct kern_ipc_perm
*isp
, int semflg
)
3050 may
= smack_flags_to_may(semflg
);
3051 return smk_curacc_sem(isp
, may
);
3055 * smack_sem_shmctl - Smack access check for sem
3057 * @cmd: what it wants to do
3059 * Returns 0 if current has the requested access, error code otherwise
3061 static int smack_sem_semctl(struct kern_ipc_perm
*isp
, int cmd
)
3080 may
= MAY_READWRITE
;
3085 * System level information
3092 return smk_curacc_sem(isp
, may
);
3096 * smack_sem_semop - Smack checks of semaphore operations
3102 * Treated as read and write in all cases.
3104 * Returns 0 if access is allowed, error code otherwise
3106 static int smack_sem_semop(struct kern_ipc_perm
*isp
, struct sembuf
*sops
,
3107 unsigned nsops
, int alter
)
3109 return smk_curacc_sem(isp
, MAY_READWRITE
);
3113 * smk_curacc_msq : helper to check if current has access on msq
3115 * @access : access requested
3117 * return 0 if current has access, error otherwise
3119 static int smk_curacc_msq(struct kern_ipc_perm
*isp
, int access
)
3121 struct smack_known
*msp
= smack_of_ipc(isp
);
3122 struct smk_audit_info ad
;
3126 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3127 ad
.a
.u
.ipc_id
= isp
->id
;
3129 rc
= smk_curacc(msp
, access
, &ad
);
3130 rc
= smk_bu_current("msq", msp
, access
, rc
);
3135 * smack_msg_queue_associate - Smack access check for msg_queue
3137 * @msqflg: access requested
3139 * Returns 0 if current has the requested access, error code otherwise
3141 static int smack_msg_queue_associate(struct kern_ipc_perm
*isp
, int msqflg
)
3145 may
= smack_flags_to_may(msqflg
);
3146 return smk_curacc_msq(isp
, may
);
3150 * smack_msg_queue_msgctl - Smack access check for msg_queue
3152 * @cmd: what it wants to do
3154 * Returns 0 if current has the requested access, error code otherwise
3156 static int smack_msg_queue_msgctl(struct kern_ipc_perm
*isp
, int cmd
)
3168 may
= MAY_READWRITE
;
3173 * System level information
3180 return smk_curacc_msq(isp
, may
);
3184 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3187 * @msqflg: access requested
3189 * Returns 0 if current has the requested access, error code otherwise
3191 static int smack_msg_queue_msgsnd(struct kern_ipc_perm
*isp
, struct msg_msg
*msg
,
3196 may
= smack_flags_to_may(msqflg
);
3197 return smk_curacc_msq(isp
, may
);
3201 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3208 * Returns 0 if current has read and write access, error code otherwise
3210 static int smack_msg_queue_msgrcv(struct kern_ipc_perm
*isp
, struct msg_msg
*msg
,
3211 struct task_struct
*target
, long type
, int mode
)
3213 return smk_curacc_msq(isp
, MAY_READWRITE
);
3217 * smack_ipc_permission - Smack access for ipc_permission()
3218 * @ipp: the object permissions
3219 * @flag: access requested
3221 * Returns 0 if current has read and write access, error code otherwise
3223 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3225 struct smack_known
**blob
= smack_ipc(ipp
);
3226 struct smack_known
*iskp
= *blob
;
3227 int may
= smack_flags_to_may(flag
);
3228 struct smk_audit_info ad
;
3232 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3233 ad
.a
.u
.ipc_id
= ipp
->id
;
3235 rc
= smk_curacc(iskp
, may
, &ad
);
3236 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3241 * smack_ipc_getsecid - Extract smack security id
3242 * @ipp: the object permissions
3243 * @secid: where result will be saved
3245 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3247 struct smack_known
**blob
= smack_ipc(ipp
);
3248 struct smack_known
*iskp
= *blob
;
3250 *secid
= iskp
->smk_secid
;
3254 * smack_d_instantiate - Make sure the blob is correct on an inode
3255 * @opt_dentry: dentry where inode will be attached
3256 * @inode: the object
3258 * Set the inode's security blob if it hasn't been done already.
3260 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3262 struct super_block
*sbp
;
3263 struct superblock_smack
*sbsp
;
3264 struct inode_smack
*isp
;
3265 struct smack_known
*skp
;
3266 struct smack_known
*ckp
= smk_of_current();
3267 struct smack_known
*final
;
3268 char trattr
[TRANS_TRUE_SIZE
];
3276 isp
= smack_inode(inode
);
3279 * If the inode is already instantiated
3280 * take the quick way out
3282 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3286 sbsp
= sbp
->s_security
;
3288 * We're going to use the superblock default label
3289 * if there's no label on the file.
3291 final
= sbsp
->smk_default
;
3294 * If this is the root inode the superblock
3295 * may be in the process of initialization.
3296 * If that is the case use the root value out
3297 * of the superblock.
3299 if (opt_dentry
->d_parent
== opt_dentry
) {
3300 switch (sbp
->s_magic
) {
3301 case CGROUP_SUPER_MAGIC
:
3302 case CGROUP2_SUPER_MAGIC
:
3304 * The cgroup filesystem is never mounted,
3305 * so there's no opportunity to set the mount
3308 sbsp
->smk_root
= &smack_known_star
;
3309 sbsp
->smk_default
= &smack_known_star
;
3310 isp
->smk_inode
= sbsp
->smk_root
;
3314 * What about shmem/tmpfs anonymous files with dentry
3315 * obtained from d_alloc_pseudo()?
3317 isp
->smk_inode
= smk_of_current();
3320 isp
->smk_inode
= smk_of_current();
3324 * Socket access is controlled by the socket
3325 * structures associated with the task involved.
3327 isp
->smk_inode
= &smack_known_star
;
3330 isp
->smk_inode
= sbsp
->smk_root
;
3333 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3338 * This is pretty hackish.
3339 * Casey says that we shouldn't have to do
3340 * file system specific code, but it does help
3341 * with keeping it simple.
3343 switch (sbp
->s_magic
) {
3345 case CGROUP_SUPER_MAGIC
:
3346 case CGROUP2_SUPER_MAGIC
:
3348 * Casey says that it's a little embarrassing
3349 * that the smack file system doesn't do
3350 * extended attributes.
3352 * Cgroupfs is special
3354 final
= &smack_known_star
;
3356 case DEVPTS_SUPER_MAGIC
:
3358 * devpts seems content with the label of the task.
3359 * Programs that change smack have to treat the
3364 case PROC_SUPER_MAGIC
:
3366 * Casey says procfs appears not to care.
3367 * The superblock default suffices.
3372 * Device labels should come from the filesystem,
3373 * but watch out, because they're volitile,
3374 * getting recreated on every reboot.
3376 final
= &smack_known_star
;
3378 * If a smack value has been set we want to use it,
3379 * but since tmpfs isn't giving us the opportunity
3380 * to set mount options simulate setting the
3381 * superblock default.
3386 * This isn't an understood special case.
3387 * Get the value from the xattr.
3391 * UNIX domain sockets use lower level socket data.
3393 if (S_ISSOCK(inode
->i_mode
)) {
3394 final
= &smack_known_star
;
3398 * No xattr support means, alas, no SMACK label.
3399 * Use the aforeapplied default.
3400 * It would be curious if the label of the task
3401 * does not match that assigned.
3403 if (!(inode
->i_opflags
& IOP_XATTR
))
3406 * Get the dentry for xattr.
3408 dp
= dget(opt_dentry
);
3409 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3410 if (!IS_ERR_OR_NULL(skp
))
3414 * Transmuting directory
3416 if (S_ISDIR(inode
->i_mode
)) {
3418 * If this is a new directory and the label was
3419 * transmuted when the inode was initialized
3420 * set the transmute attribute on the directory
3421 * and mark the inode.
3423 * If there is a transmute attribute on the
3424 * directory mark the inode.
3426 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3427 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3428 rc
= __vfs_setxattr(dp
, inode
,
3429 XATTR_NAME_SMACKTRANSMUTE
,
3430 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3433 rc
= __vfs_getxattr(dp
, inode
,
3434 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3436 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3437 TRANS_TRUE_SIZE
) != 0)
3441 transflag
= SMK_INODE_TRANSMUTE
;
3444 * Don't let the exec or mmap label be "*" or "@".
3446 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3447 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3448 skp
== &smack_known_web
)
3450 isp
->smk_task
= skp
;
3452 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3453 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3454 skp
== &smack_known_web
)
3456 isp
->smk_mmap
= skp
;
3463 isp
->smk_inode
= ckp
;
3465 isp
->smk_inode
= final
;
3467 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3473 * smack_getprocattr - Smack process attribute access
3474 * @p: the object task
3475 * @name: the name of the attribute in /proc/.../attr
3476 * @value: where to put the result
3478 * Places a copy of the task Smack into value
3480 * Returns the length of the smack label or an error code
3482 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3484 struct smack_known
*skp
= smk_of_task_struct(p
);
3488 if (strcmp(name
, "current") != 0)
3491 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3501 * smack_setprocattr - Smack process attribute setting
3502 * @name: the name of the attribute in /proc/.../attr
3503 * @value: the value to set
3504 * @size: the size of the value
3506 * Sets the Smack value of the task. Only setting self
3507 * is permitted and only with privilege
3509 * Returns the length of the smack label or an error code
3511 static int smack_setprocattr(const char *name
, void *value
, size_t size
)
3513 struct task_smack
*tsp
= smack_cred(current_cred());
3515 struct smack_known
*skp
;
3516 struct smack_known_list_elem
*sklep
;
3519 if (!smack_privileged(CAP_MAC_ADMIN
) && list_empty(&tsp
->smk_relabel
))
3522 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3525 if (strcmp(name
, "current") != 0)
3528 skp
= smk_import_entry(value
, size
);
3530 return PTR_ERR(skp
);
3533 * No process is ever allowed the web ("@") label
3534 * and the star ("*") label.
3536 if (skp
== &smack_known_web
|| skp
== &smack_known_star
)
3539 if (!smack_privileged(CAP_MAC_ADMIN
)) {
3541 list_for_each_entry(sklep
, &tsp
->smk_relabel
, list
)
3542 if (sklep
->smk_label
== skp
) {
3550 new = prepare_creds();
3554 tsp
= smack_cred(new);
3555 tsp
->smk_task
= skp
;
3557 * process can change its label only once
3559 smk_destroy_label_list(&tsp
->smk_relabel
);
3566 * smack_unix_stream_connect - Smack access on UDS
3568 * @other: the other sock
3571 * Return 0 if a subject with the smack of sock could access
3572 * an object with the smack of other, otherwise an error code
3574 static int smack_unix_stream_connect(struct sock
*sock
,
3575 struct sock
*other
, struct sock
*newsk
)
3577 struct smack_known
*skp
;
3578 struct smack_known
*okp
;
3579 struct socket_smack
*ssp
= sock
->sk_security
;
3580 struct socket_smack
*osp
= other
->sk_security
;
3581 struct socket_smack
*nsp
= newsk
->sk_security
;
3582 struct smk_audit_info ad
;
3585 struct lsm_network_audit net
;
3588 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3592 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3593 smk_ad_setfield_u_net_sk(&ad
, other
);
3595 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3596 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3600 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3601 rc
= smk_bu_note("UDS connect", okp
, skp
,
3607 * Cross reference the peer labels for SO_PEERSEC.
3610 nsp
->smk_packet
= ssp
->smk_out
;
3611 ssp
->smk_packet
= osp
->smk_out
;
3618 * smack_unix_may_send - Smack access on UDS
3620 * @other: the other socket
3622 * Return 0 if a subject with the smack of sock could access
3623 * an object with the smack of other, otherwise an error code
3625 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3627 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3628 struct socket_smack
*osp
= other
->sk
->sk_security
;
3629 struct smk_audit_info ad
;
3633 struct lsm_network_audit net
;
3635 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3636 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3639 if (smack_privileged(CAP_MAC_OVERRIDE
))
3642 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3643 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3648 * smack_socket_sendmsg - Smack check based on destination host
3651 * @size: the size of the message
3653 * Return 0 if the current subject can write to the destination host.
3654 * For IPv4 this is only a question if the destination is a single label host.
3655 * For IPv6 this is a check against the label of the port.
3657 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3660 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3661 #if IS_ENABLED(CONFIG_IPV6)
3662 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3664 #ifdef SMACK_IPV6_SECMARK_LABELING
3665 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3666 struct smack_known
*rsp
;
3671 * Perfectly reasonable for this to be NULL
3676 switch (sock
->sk
->sk_family
) {
3678 if (msg
->msg_namelen
< sizeof(struct sockaddr_in
) ||
3679 sip
->sin_family
!= AF_INET
)
3681 rc
= smk_ipv4_check(sock
->sk
, sip
);
3683 #if IS_ENABLED(CONFIG_IPV6)
3685 if (msg
->msg_namelen
< SIN6_LEN_RFC2133
||
3686 sap
->sin6_family
!= AF_INET6
)
3688 #ifdef SMACK_IPV6_SECMARK_LABELING
3689 rsp
= smack_ipv6host_label(sap
);
3691 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3694 #ifdef SMACK_IPV6_PORT_LABELING
3695 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3697 #endif /* IS_ENABLED(CONFIG_IPV6) */
3704 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3705 * @sap: netlabel secattr
3706 * @ssp: socket security information
3708 * Returns a pointer to a Smack label entry found on the label list.
3710 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3711 struct socket_smack
*ssp
)
3713 struct smack_known
*skp
;
3719 * Netlabel found it in the cache.
3721 if ((sap
->flags
& NETLBL_SECATTR_CACHE
) != 0)
3722 return (struct smack_known
*)sap
->cache
->data
;
3724 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0)
3726 * Looks like a fallback, which gives us a secid.
3728 return smack_from_secid(sap
->attr
.secid
);
3730 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3732 * Looks like a CIPSO packet.
3733 * If there are flags but no level netlabel isn't
3734 * behaving the way we expect it to.
3736 * Look it up in the label table
3737 * Without guidance regarding the smack value
3738 * for the packet fall back on the network
3742 list_for_each_entry_rcu(skp
, &smack_known_list
, list
) {
3743 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3746 * Compare the catsets. Use the netlbl APIs.
3748 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3749 if ((skp
->smk_netlabel
.flags
&
3750 NETLBL_SECATTR_MLS_CAT
) == 0)
3754 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3755 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3757 kcat
= netlbl_catmap_walk(
3758 skp
->smk_netlabel
.attr
.mls
.cat
,
3760 if (acat
< 0 || kcat
< 0)
3773 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3774 return &smack_known_web
;
3775 return &smack_known_star
;
3778 * Without guidance regarding the smack value
3779 * for the packet fall back on the network
3782 return smack_net_ambient
;
3785 #if IS_ENABLED(CONFIG_IPV6)
3786 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3790 int proto
= -EINVAL
;
3791 struct ipv6hdr _ipv6h
;
3792 struct ipv6hdr
*ip6
;
3794 struct tcphdr _tcph
, *th
;
3795 struct udphdr _udph
, *uh
;
3796 struct dccp_hdr _dccph
, *dh
;
3800 offset
= skb_network_offset(skb
);
3801 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3804 sip
->sin6_addr
= ip6
->saddr
;
3806 nexthdr
= ip6
->nexthdr
;
3807 offset
+= sizeof(_ipv6h
);
3808 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3815 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3817 sip
->sin6_port
= th
->source
;
3820 case IPPROTO_UDPLITE
:
3821 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3823 sip
->sin6_port
= uh
->source
;
3826 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3828 sip
->sin6_port
= dh
->dccph_sport
;
3833 #endif /* CONFIG_IPV6 */
3836 * smack_from_skb - Smack data from the secmark in an skb
3839 * Returns smack_known of the secmark or NULL if that won't work.
3841 #ifdef CONFIG_NETWORK_SECMARK
3842 static struct smack_known
*smack_from_skb(struct sk_buff
*skb
)
3844 if (skb
== NULL
|| skb
->secmark
== 0)
3847 return smack_from_secid(skb
->secmark
);
3850 static inline struct smack_known
*smack_from_skb(struct sk_buff
*skb
)
3857 * smack_from_netlbl - Smack data from the IP options in an skb
3858 * @sk: socket data came in on
3859 * @family: address family
3862 * Find the Smack label in the IP options. If it hasn't been
3863 * added to the netlabel cache, add it here.
3865 * Returns smack_known of the IP options or NULL if that won't work.
3867 static struct smack_known
*smack_from_netlbl(const struct sock
*sk
, u16 family
,
3868 struct sk_buff
*skb
)
3870 struct netlbl_lsm_secattr secattr
;
3871 struct socket_smack
*ssp
= NULL
;
3872 struct smack_known
*skp
= NULL
;
3874 netlbl_secattr_init(&secattr
);
3877 ssp
= sk
->sk_security
;
3879 if (netlbl_skbuff_getattr(skb
, family
, &secattr
) == 0) {
3880 skp
= smack_from_secattr(&secattr
, ssp
);
3881 if (secattr
.flags
& NETLBL_SECATTR_CACHEABLE
)
3882 netlbl_cache_add(skb
, family
, &skp
->smk_netlabel
);
3885 netlbl_secattr_destroy(&secattr
);
3891 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3895 * Returns 0 if the packet should be delivered, an error code otherwise
3897 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3899 struct socket_smack
*ssp
= sk
->sk_security
;
3900 struct smack_known
*skp
= NULL
;
3902 struct smk_audit_info ad
;
3903 u16 family
= sk
->sk_family
;
3905 struct lsm_network_audit net
;
3907 #if IS_ENABLED(CONFIG_IPV6)
3908 struct sockaddr_in6 sadd
;
3911 if (family
== PF_INET6
&& skb
->protocol
== htons(ETH_P_IP
))
3913 #endif /* CONFIG_IPV6 */
3918 * If there is a secmark use it rather than the CIPSO label.
3919 * If there is no secmark fall back to CIPSO.
3920 * The secmark is assumed to reflect policy better.
3922 skp
= smack_from_skb(skb
);
3924 skp
= smack_from_netlbl(sk
, family
, skb
);
3926 skp
= smack_net_ambient
;
3930 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3931 ad
.a
.u
.net
->family
= family
;
3932 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3933 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3936 * Receiving a packet requires that the other end
3937 * be able to write here. Read access is not required.
3938 * This is the simplist possible security model
3941 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3942 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3945 netlbl_skbuff_err(skb
, family
, rc
, 0);
3947 #if IS_ENABLED(CONFIG_IPV6)
3949 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3950 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_UDPLITE
&&
3951 proto
!= IPPROTO_TCP
&& proto
!= IPPROTO_DCCP
)
3953 #ifdef SMACK_IPV6_SECMARK_LABELING
3954 skp
= smack_from_skb(skb
);
3956 if (smk_ipv6_localhost(&sadd
))
3958 skp
= smack_ipv6host_label(&sadd
);
3960 skp
= smack_net_ambient
;
3963 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3964 ad
.a
.u
.net
->family
= family
;
3965 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3966 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3967 #endif /* CONFIG_AUDIT */
3968 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3969 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
3971 #endif /* SMACK_IPV6_SECMARK_LABELING */
3972 #ifdef SMACK_IPV6_PORT_LABELING
3973 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3974 #endif /* SMACK_IPV6_PORT_LABELING */
3976 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
,
3977 ICMPV6_ADM_PROHIBITED
, 0);
3979 #endif /* CONFIG_IPV6 */
3986 * smack_socket_getpeersec_stream - pull in packet label
3988 * @optval: user's destination
3989 * @optlen: size thereof
3992 * returns zero on success, an error code otherwise
3994 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3995 char __user
*optval
,
3996 int __user
*optlen
, unsigned len
)
3998 struct socket_smack
*ssp
;
4003 ssp
= sock
->sk
->sk_security
;
4004 if (ssp
->smk_packet
!= NULL
) {
4005 rcp
= ssp
->smk_packet
->smk_known
;
4006 slen
= strlen(rcp
) + 1;
4011 else if (copy_to_user(optval
, rcp
, slen
) != 0)
4014 if (put_user(slen
, optlen
) != 0)
4022 * smack_socket_getpeersec_dgram - pull in packet label
4023 * @sock: the peer socket
4025 * @secid: pointer to where to put the secid of the packet
4027 * Sets the netlabel socket state on sk from parent
4029 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4030 struct sk_buff
*skb
, u32
*secid
)
4033 struct socket_smack
*ssp
= NULL
;
4034 struct smack_known
*skp
;
4035 struct sock
*sk
= NULL
;
4036 int family
= PF_UNSPEC
;
4037 u32 s
= 0; /* 0 is the invalid secid */
4040 if (skb
->protocol
== htons(ETH_P_IP
))
4042 #if IS_ENABLED(CONFIG_IPV6)
4043 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4045 #endif /* CONFIG_IPV6 */
4047 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4048 family
= sock
->sk
->sk_family
;
4052 ssp
= sock
->sk
->sk_security
;
4053 s
= ssp
->smk_out
->smk_secid
;
4056 skp
= smack_from_skb(skb
);
4062 * Translate what netlabel gave us.
4066 skp
= smack_from_netlbl(sk
, family
, skb
);
4071 #ifdef SMACK_IPV6_SECMARK_LABELING
4072 skp
= smack_from_skb(skb
);
4085 * smack_sock_graft - Initialize a newly created socket with an existing sock
4087 * @parent: parent socket
4089 * Set the smk_{in,out} state of an existing sock based on the process that
4090 * is creating the new socket.
4092 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4094 struct socket_smack
*ssp
;
4095 struct smack_known
*skp
= smk_of_current();
4098 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4101 ssp
= sk
->sk_security
;
4104 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4108 * smack_inet_conn_request - Smack access check on connect
4109 * @sk: socket involved
4113 * Returns 0 if a task with the packet label could write to
4114 * the socket, otherwise an error code
4116 static int smack_inet_conn_request(const struct sock
*sk
, struct sk_buff
*skb
,
4117 struct request_sock
*req
)
4119 u16 family
= sk
->sk_family
;
4120 struct smack_known
*skp
;
4121 struct socket_smack
*ssp
= sk
->sk_security
;
4122 struct sockaddr_in addr
;
4124 struct smack_known
*hskp
;
4126 struct smk_audit_info ad
;
4128 struct lsm_network_audit net
;
4131 #if IS_ENABLED(CONFIG_IPV6)
4132 if (family
== PF_INET6
) {
4134 * Handle mapped IPv4 packets arriving
4135 * via IPv6 sockets. Don't set up netlabel
4136 * processing on IPv6.
4138 if (skb
->protocol
== htons(ETH_P_IP
))
4143 #endif /* CONFIG_IPV6 */
4146 * If there is a secmark use it rather than the CIPSO label.
4147 * If there is no secmark fall back to CIPSO.
4148 * The secmark is assumed to reflect policy better.
4150 skp
= smack_from_skb(skb
);
4152 skp
= smack_from_netlbl(sk
, family
, skb
);
4154 skp
= &smack_known_huh
;
4158 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4159 ad
.a
.u
.net
->family
= family
;
4160 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4161 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4164 * Receiving a packet requires that the other end be able to write
4165 * here. Read access is not required.
4167 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4168 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4173 * Save the peer's label in the request_sock so we can later setup
4174 * smk_packet in the child socket so that SO_PEERCRED can report it.
4176 req
->peer_secid
= skp
->smk_secid
;
4179 * We need to decide if we want to label the incoming connection here
4180 * if we do we only need to label the request_sock and the stack will
4181 * propagate the wire-label to the sock when it is created.
4184 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4186 hskp
= smack_ipv4host_label(&addr
);
4190 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4192 netlbl_req_delattr(req
);
4198 * smack_inet_csk_clone - Copy the connection information to the new socket
4199 * @sk: the new socket
4200 * @req: the connection's request_sock
4202 * Transfer the connection's peer label to the newly created socket.
4204 static void smack_inet_csk_clone(struct sock
*sk
,
4205 const struct request_sock
*req
)
4207 struct socket_smack
*ssp
= sk
->sk_security
;
4208 struct smack_known
*skp
;
4210 if (req
->peer_secid
!= 0) {
4211 skp
= smack_from_secid(req
->peer_secid
);
4212 ssp
->smk_packet
= skp
;
4214 ssp
->smk_packet
= NULL
;
4218 * Key management security hooks
4220 * Casey has not tested key support very heavily.
4221 * The permission check is most likely too restrictive.
4222 * If you care about keys please have a look.
4227 * smack_key_alloc - Set the key security blob
4229 * @cred: the credentials to use
4232 * No allocation required
4236 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4237 unsigned long flags
)
4239 struct smack_known
*skp
= smk_of_task(smack_cred(cred
));
4241 key
->security
= skp
;
4246 * smack_key_free - Clear the key security blob
4249 * Clear the blob pointer
4251 static void smack_key_free(struct key
*key
)
4253 key
->security
= NULL
;
4257 * smack_key_permission - Smack access on a key
4258 * @key_ref: gets to the object
4259 * @cred: the credentials to use
4260 * @need_perm: requested key permission
4262 * Return 0 if the task has read and write to the object,
4263 * an error code otherwise
4265 static int smack_key_permission(key_ref_t key_ref
,
4266 const struct cred
*cred
,
4267 enum key_need_perm need_perm
)
4270 struct smk_audit_info ad
;
4271 struct smack_known
*tkp
= smk_of_task(smack_cred(cred
));
4276 * Validate requested permissions
4278 switch (need_perm
) {
4280 case KEY_NEED_SEARCH
:
4282 request
|= MAY_READ
;
4284 case KEY_NEED_WRITE
:
4286 case KEY_NEED_SETATTR
:
4287 request
|= MAY_WRITE
;
4289 case KEY_NEED_UNSPECIFIED
:
4290 case KEY_NEED_UNLINK
:
4291 case KEY_SYSADMIN_OVERRIDE
:
4292 case KEY_AUTHTOKEN_OVERRIDE
:
4293 case KEY_DEFER_PERM_CHECK
:
4299 keyp
= key_ref_to_ptr(key_ref
);
4303 * If the key hasn't been initialized give it access so that
4306 if (keyp
->security
== NULL
)
4309 * This should not occur
4314 if (smack_privileged(CAP_MAC_OVERRIDE
))
4318 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4319 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4320 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4322 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4323 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4328 * smack_key_getsecurity - Smack label tagging the key
4329 * @key points to the key to be queried
4330 * @_buffer points to a pointer that should be set to point to the
4331 * resulting string (if no label or an error occurs).
4332 * Return the length of the string (including terminating NUL) or -ve if
4334 * May also return 0 (and a NULL buffer pointer) if there is no label.
4336 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4338 struct smack_known
*skp
= key
->security
;
4342 if (key
->security
== NULL
) {
4347 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4350 length
= strlen(copy
) + 1;
4357 #ifdef CONFIG_KEY_NOTIFICATIONS
4359 * smack_watch_key - Smack access to watch a key for notifications.
4360 * @key: The key to be watched
4362 * Return 0 if the @watch->cred has permission to read from the key object and
4363 * an error otherwise.
4365 static int smack_watch_key(struct key
*key
)
4367 struct smk_audit_info ad
;
4368 struct smack_known
*tkp
= smk_of_current();
4374 * If the key hasn't been initialized give it access so that
4377 if (key
->security
== NULL
)
4380 * This should not occur
4385 if (smack_privileged_cred(CAP_MAC_OVERRIDE
, current_cred()))
4389 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4390 ad
.a
.u
.key_struct
.key
= key
->serial
;
4391 ad
.a
.u
.key_struct
.key_desc
= key
->description
;
4393 rc
= smk_access(tkp
, key
->security
, MAY_READ
, &ad
);
4394 rc
= smk_bu_note("key watch", tkp
, key
->security
, MAY_READ
, rc
);
4397 #endif /* CONFIG_KEY_NOTIFICATIONS */
4398 #endif /* CONFIG_KEYS */
4400 #ifdef CONFIG_WATCH_QUEUE
4402 * smack_post_notification - Smack access to post a notification to a queue
4403 * @w_cred: The credentials of the watcher.
4404 * @cred: The credentials of the event source (may be NULL).
4405 * @n: The notification message to be posted.
4407 static int smack_post_notification(const struct cred
*w_cred
,
4408 const struct cred
*cred
,
4409 struct watch_notification
*n
)
4411 struct smk_audit_info ad
;
4412 struct smack_known
*subj
, *obj
;
4415 /* Always let maintenance notifications through. */
4416 if (n
->type
== WATCH_TYPE_META
)
4421 subj
= smk_of_task(smack_cred(cred
));
4422 obj
= smk_of_task(smack_cred(w_cred
));
4424 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_NOTIFICATION
);
4425 rc
= smk_access(subj
, obj
, MAY_WRITE
, &ad
);
4426 rc
= smk_bu_note("notification", subj
, obj
, MAY_WRITE
, rc
);
4429 #endif /* CONFIG_WATCH_QUEUE */
4434 * Audit requires a unique representation of each Smack specific
4435 * rule. This unique representation is used to distinguish the
4436 * object to be audited from remaining kernel objects and also
4437 * works as a glue between the audit hooks.
4439 * Since repository entries are added but never deleted, we'll use
4440 * the smack_known label address related to the given audit rule as
4441 * the needed unique representation. This also better fits the smack
4442 * model where nearly everything is a label.
4447 * smack_audit_rule_init - Initialize a smack audit rule
4448 * @field: audit rule fields given from user-space (audit.h)
4449 * @op: required testing operator (=, !=, >, <, ...)
4450 * @rulestr: smack label to be audited
4451 * @vrule: pointer to save our own audit rule representation
4453 * Prepare to audit cases where (@field @op @rulestr) is true.
4454 * The label to be audited is created if necessay.
4456 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4458 struct smack_known
*skp
;
4459 char **rule
= (char **)vrule
;
4462 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4465 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4468 skp
= smk_import_entry(rulestr
, 0);
4470 return PTR_ERR(skp
);
4472 *rule
= skp
->smk_known
;
4478 * smack_audit_rule_known - Distinguish Smack audit rules
4479 * @krule: rule of interest, in Audit kernel representation format
4481 * This is used to filter Smack rules from remaining Audit ones.
4482 * If it's proved that this rule belongs to us, the
4483 * audit_rule_match hook will be called to do the final judgement.
4485 static int smack_audit_rule_known(struct audit_krule
*krule
)
4487 struct audit_field
*f
;
4490 for (i
= 0; i
< krule
->field_count
; i
++) {
4491 f
= &krule
->fields
[i
];
4493 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4501 * smack_audit_rule_match - Audit given object ?
4502 * @secid: security id for identifying the object to test
4503 * @field: audit rule flags given from user-space
4504 * @op: required testing operator
4505 * @vrule: smack internal rule presentation
4507 * The core Audit hook. It's used to take the decision of
4508 * whether to audit or not to audit a given object.
4510 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
)
4512 struct smack_known
*skp
;
4515 if (unlikely(!rule
)) {
4516 WARN_ONCE(1, "Smack: missing rule\n");
4520 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4523 skp
= smack_from_secid(secid
);
4526 * No need to do string comparisons. If a match occurs,
4527 * both pointers will point to the same smack_known
4530 if (op
== Audit_equal
)
4531 return (rule
== skp
->smk_known
);
4532 if (op
== Audit_not_equal
)
4533 return (rule
!= skp
->smk_known
);
4539 * There is no need for a smack_audit_rule_free hook.
4540 * No memory was allocated.
4543 #endif /* CONFIG_AUDIT */
4546 * smack_ismaclabel - check if xattr @name references a smack MAC label
4547 * @name: Full xattr name to check.
4549 static int smack_ismaclabel(const char *name
)
4551 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4556 * smack_secid_to_secctx - return the smack label for a secid
4557 * @secid: incoming integer
4558 * @secdata: destination
4559 * @seclen: how long it is
4561 * Exists for networking code.
4563 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4565 struct smack_known
*skp
= smack_from_secid(secid
);
4568 *secdata
= skp
->smk_known
;
4569 *seclen
= strlen(skp
->smk_known
);
4574 * smack_secctx_to_secid - return the secid for a smack label
4575 * @secdata: smack label
4576 * @seclen: how long result is
4577 * @secid: outgoing integer
4579 * Exists for audit and networking code.
4581 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4583 struct smack_known
*skp
= smk_find_entry(secdata
);
4586 *secid
= skp
->smk_secid
;
4593 * There used to be a smack_release_secctx hook
4594 * that did nothing back when hooks were in a vector.
4595 * Now that there's a list such a hook adds cost.
4598 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4600 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4603 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4605 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4608 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4610 struct smack_known
*skp
= smk_of_inode(inode
);
4612 *ctx
= skp
->smk_known
;
4613 *ctxlen
= strlen(skp
->smk_known
);
4617 static int smack_inode_copy_up(struct dentry
*dentry
, struct cred
**new)
4620 struct task_smack
*tsp
;
4621 struct smack_known
*skp
;
4622 struct inode_smack
*isp
;
4623 struct cred
*new_creds
= *new;
4625 if (new_creds
== NULL
) {
4626 new_creds
= prepare_creds();
4627 if (new_creds
== NULL
)
4631 tsp
= smack_cred(new_creds
);
4634 * Get label from overlay inode and set it in create_sid
4636 isp
= smack_inode(d_inode(dentry
->d_parent
));
4637 skp
= isp
->smk_inode
;
4638 tsp
->smk_task
= skp
;
4643 static int smack_inode_copy_up_xattr(const char *name
)
4646 * Return 1 if this is the smack access Smack attribute.
4648 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
4654 static int smack_dentry_create_files_as(struct dentry
*dentry
, int mode
,
4656 const struct cred
*old
,
4659 struct task_smack
*otsp
= smack_cred(old
);
4660 struct task_smack
*ntsp
= smack_cred(new);
4661 struct inode_smack
*isp
;
4665 * Use the process credential unless all of
4666 * the transmuting criteria are met
4668 ntsp
->smk_task
= otsp
->smk_task
;
4671 * the attribute of the containing directory
4673 isp
= smack_inode(d_inode(dentry
->d_parent
));
4675 if (isp
->smk_flags
& SMK_INODE_TRANSMUTE
) {
4677 may
= smk_access_entry(otsp
->smk_task
->smk_known
,
4678 isp
->smk_inode
->smk_known
,
4679 &otsp
->smk_task
->smk_rules
);
4683 * If the directory is transmuting and the rule
4684 * providing access is transmuting use the containing
4685 * directory label instead of the process label.
4687 if (may
> 0 && (may
& MAY_TRANSMUTE
))
4688 ntsp
->smk_task
= isp
->smk_inode
;
4693 struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init
= {
4694 .lbs_cred
= sizeof(struct task_smack
),
4695 .lbs_file
= sizeof(struct smack_known
*),
4696 .lbs_inode
= sizeof(struct inode_smack
),
4697 .lbs_ipc
= sizeof(struct smack_known
*),
4698 .lbs_msg_msg
= sizeof(struct smack_known
*),
4701 static struct security_hook_list smack_hooks
[] __lsm_ro_after_init
= {
4702 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4703 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4704 LSM_HOOK_INIT(syslog
, smack_syslog
),
4706 LSM_HOOK_INIT(fs_context_dup
, smack_fs_context_dup
),
4707 LSM_HOOK_INIT(fs_context_parse_param
, smack_fs_context_parse_param
),
4709 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4710 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4711 LSM_HOOK_INIT(sb_free_mnt_opts
, smack_free_mnt_opts
),
4712 LSM_HOOK_INIT(sb_eat_lsm_opts
, smack_sb_eat_lsm_opts
),
4713 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4714 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4716 LSM_HOOK_INIT(bprm_creds_for_exec
, smack_bprm_creds_for_exec
),
4718 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4719 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4720 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4721 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4722 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4723 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4724 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4725 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4726 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4727 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4728 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4729 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4730 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4731 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4732 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4733 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4734 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4736 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4737 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4738 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4739 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4740 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4741 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4742 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4743 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4744 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4746 LSM_HOOK_INIT(file_open
, smack_file_open
),
4748 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4749 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4750 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4751 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4752 LSM_HOOK_INIT(cred_getsecid
, smack_cred_getsecid
),
4753 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4754 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4755 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4756 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4757 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4758 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4759 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4760 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4761 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4762 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4763 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4764 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4765 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4766 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4768 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4769 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4771 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4773 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_ipc_alloc_security
),
4774 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4775 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4776 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4777 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4779 LSM_HOOK_INIT(shm_alloc_security
, smack_ipc_alloc_security
),
4780 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4781 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4782 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4784 LSM_HOOK_INIT(sem_alloc_security
, smack_ipc_alloc_security
),
4785 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4786 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4787 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4789 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4791 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4792 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4794 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4795 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4797 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4798 LSM_HOOK_INIT(socket_socketpair
, smack_socket_socketpair
),
4799 #ifdef SMACK_IPV6_PORT_LABELING
4800 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4802 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4803 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4804 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4805 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4806 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4807 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4808 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4809 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4810 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4811 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4813 /* key management security hooks */
4815 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4816 LSM_HOOK_INIT(key_free
, smack_key_free
),
4817 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4818 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4819 #ifdef CONFIG_KEY_NOTIFICATIONS
4820 LSM_HOOK_INIT(watch_key
, smack_watch_key
),
4822 #endif /* CONFIG_KEYS */
4824 #ifdef CONFIG_WATCH_QUEUE
4825 LSM_HOOK_INIT(post_notification
, smack_post_notification
),
4830 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4831 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4832 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4833 #endif /* CONFIG_AUDIT */
4835 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4836 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4837 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4838 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4839 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4840 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4841 LSM_HOOK_INIT(inode_copy_up
, smack_inode_copy_up
),
4842 LSM_HOOK_INIT(inode_copy_up_xattr
, smack_inode_copy_up_xattr
),
4843 LSM_HOOK_INIT(dentry_create_files_as
, smack_dentry_create_files_as
),
4847 static __init
void init_smack_known_list(void)
4850 * Initialize rule list locks
4852 mutex_init(&smack_known_huh
.smk_rules_lock
);
4853 mutex_init(&smack_known_hat
.smk_rules_lock
);
4854 mutex_init(&smack_known_floor
.smk_rules_lock
);
4855 mutex_init(&smack_known_star
.smk_rules_lock
);
4856 mutex_init(&smack_known_web
.smk_rules_lock
);
4858 * Initialize rule lists
4860 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4861 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4862 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4863 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4864 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4866 * Create the known labels list
4868 smk_insert_entry(&smack_known_huh
);
4869 smk_insert_entry(&smack_known_hat
);
4870 smk_insert_entry(&smack_known_star
);
4871 smk_insert_entry(&smack_known_floor
);
4872 smk_insert_entry(&smack_known_web
);
4876 * smack_init - initialize the smack system
4878 * Returns 0 on success, -ENOMEM is there's no memory
4880 static __init
int smack_init(void)
4882 struct cred
*cred
= (struct cred
*) current
->cred
;
4883 struct task_smack
*tsp
;
4885 smack_rule_cache
= KMEM_CACHE(smack_rule
, 0);
4886 if (!smack_rule_cache
)
4890 * Set the security state for the initial task.
4892 tsp
= smack_cred(cred
);
4893 init_task_smack(tsp
, &smack_known_floor
, &smack_known_floor
);
4898 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
), "smack");
4901 pr_info("Smack: Initializing.\n");
4902 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4903 pr_info("Smack: Netfilter enabled.\n");
4905 #ifdef SMACK_IPV6_PORT_LABELING
4906 pr_info("Smack: IPv6 port labeling enabled.\n");
4908 #ifdef SMACK_IPV6_SECMARK_LABELING
4909 pr_info("Smack: IPv6 Netfilter enabled.\n");
4912 /* initialize the smack_known_list */
4913 init_smack_known_list();
4919 * Smack requires early initialization in order to label
4920 * all processes and objects when they are created.
4922 DEFINE_LSM(smack
) = {
4924 .flags
= LSM_FLAG_LEGACY_MAJOR
| LSM_FLAG_EXCLUSIVE
,
4925 .blobs
= &smack_blob_sizes
,