2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
44 #include <linux/parser.h>
47 #define TRANS_TRUE "TRUE"
48 #define TRANS_TRUE_SIZE 4
50 #define SMK_CONNECTING 0
51 #define SMK_RECEIVING 1
54 #ifdef SMACK_IPV6_PORT_LABELING
55 LIST_HEAD(smk_ipv6_port_list
);
57 static struct kmem_cache
*smack_inode_cache
;
60 static const match_table_t smk_mount_tokens
= {
61 {Opt_fsdefault
, SMK_FSDEFAULT
"%s"},
62 {Opt_fsfloor
, SMK_FSFLOOR
"%s"},
63 {Opt_fshat
, SMK_FSHAT
"%s"},
64 {Opt_fsroot
, SMK_FSROOT
"%s"},
65 {Opt_fstransmute
, SMK_FSTRANS
"%s"},
69 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
70 static char *smk_bu_mess
[] = {
71 "Bringup Error", /* Unused */
72 "Bringup", /* SMACK_BRINGUP_ALLOW */
73 "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */
74 "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */
77 static void smk_bu_mode(int mode
, char *s
)
87 if (mode
& MAY_APPEND
)
89 if (mode
& MAY_TRANSMUTE
)
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
100 static int smk_bu_note(char *note
, struct smack_known
*sskp
,
101 struct smack_known
*oskp
, int mode
, int rc
)
103 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
107 if (rc
> SMACK_UNCONFINED_OBJECT
)
110 smk_bu_mode(mode
, acc
);
111 pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess
[rc
],
112 sskp
->smk_known
, oskp
->smk_known
, acc
, note
);
116 #define smk_bu_note(note, sskp, oskp, mode, RC) (RC)
119 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
120 static int smk_bu_current(char *note
, struct smack_known
*oskp
,
123 struct task_smack
*tsp
= current_security();
124 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
128 if (rc
> SMACK_UNCONFINED_OBJECT
)
131 smk_bu_mode(mode
, acc
);
132 pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess
[rc
],
133 tsp
->smk_task
->smk_known
, oskp
->smk_known
,
134 acc
, current
->comm
, note
);
138 #define smk_bu_current(note, oskp, mode, RC) (RC)
141 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
142 static int smk_bu_task(struct task_struct
*otp
, int mode
, int rc
)
144 struct task_smack
*tsp
= current_security();
145 struct smack_known
*smk_task
= smk_of_task_struct(otp
);
146 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
150 if (rc
> SMACK_UNCONFINED_OBJECT
)
153 smk_bu_mode(mode
, acc
);
154 pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess
[rc
],
155 tsp
->smk_task
->smk_known
, smk_task
->smk_known
, acc
,
156 current
->comm
, otp
->comm
);
160 #define smk_bu_task(otp, mode, RC) (RC)
163 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
164 static int smk_bu_inode(struct inode
*inode
, int mode
, int rc
)
166 struct task_smack
*tsp
= current_security();
167 struct inode_smack
*isp
= inode
->i_security
;
168 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
170 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
171 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
172 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
176 if (rc
> SMACK_UNCONFINED_OBJECT
)
178 if (rc
== SMACK_UNCONFINED_SUBJECT
&&
179 (mode
& (MAY_WRITE
| MAY_APPEND
)))
180 isp
->smk_flags
|= SMK_INODE_IMPURE
;
182 smk_bu_mode(mode
, acc
);
184 pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess
[rc
],
185 tsp
->smk_task
->smk_known
, isp
->smk_inode
->smk_known
, acc
,
186 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
190 #define smk_bu_inode(inode, mode, RC) (RC)
193 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
194 static int smk_bu_file(struct file
*file
, int mode
, int rc
)
196 struct task_smack
*tsp
= current_security();
197 struct smack_known
*sskp
= tsp
->smk_task
;
198 struct inode
*inode
= file_inode(file
);
199 struct inode_smack
*isp
= inode
->i_security
;
200 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
202 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
203 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
204 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
208 if (rc
> SMACK_UNCONFINED_OBJECT
)
211 smk_bu_mode(mode
, acc
);
212 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
213 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
214 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
219 #define smk_bu_file(file, mode, RC) (RC)
222 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
223 static int smk_bu_credfile(const struct cred
*cred
, struct file
*file
,
226 struct task_smack
*tsp
= cred
->security
;
227 struct smack_known
*sskp
= tsp
->smk_task
;
228 struct inode
*inode
= file
->f_inode
;
229 struct inode_smack
*isp
= inode
->i_security
;
230 char acc
[SMK_NUM_ACCESS_TYPE
+ 1];
232 if (isp
->smk_flags
& SMK_INODE_IMPURE
)
233 pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
234 inode
->i_sb
->s_id
, inode
->i_ino
, current
->comm
);
238 if (rc
> SMACK_UNCONFINED_OBJECT
)
241 smk_bu_mode(mode
, acc
);
242 pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess
[rc
],
243 sskp
->smk_known
, smk_of_inode(inode
)->smk_known
, acc
,
244 inode
->i_sb
->s_id
, inode
->i_ino
, file
,
249 #define smk_bu_credfile(cred, file, mode, RC) (RC)
253 * smk_fetch - Fetch the smack label from a file.
254 * @name: type of the label (attribute)
255 * @ip: a pointer to the inode
256 * @dp: a pointer to the dentry
258 * Returns a pointer to the master list entry for the Smack label,
259 * NULL if there was no label to fetch, or an error code.
261 static struct smack_known
*smk_fetch(const char *name
, struct inode
*ip
,
266 struct smack_known
*skp
= NULL
;
268 if (ip
->i_op
->getxattr
== NULL
)
269 return ERR_PTR(-EOPNOTSUPP
);
271 buffer
= kzalloc(SMK_LONGLABEL
, GFP_KERNEL
);
273 return ERR_PTR(-ENOMEM
);
275 rc
= ip
->i_op
->getxattr(dp
, name
, buffer
, SMK_LONGLABEL
);
281 skp
= smk_import_entry(buffer
, rc
);
289 * new_inode_smack - allocate an inode security blob
290 * @skp: a pointer to the Smack label entry to use in the blob
292 * Returns the new blob or NULL if there's no memory available
294 static struct inode_smack
*new_inode_smack(struct smack_known
*skp
)
296 struct inode_smack
*isp
;
298 isp
= kmem_cache_zalloc(smack_inode_cache
, GFP_NOFS
);
302 isp
->smk_inode
= skp
;
304 mutex_init(&isp
->smk_lock
);
310 * new_task_smack - allocate a task security blob
311 * @task: a pointer to the Smack label for the running task
312 * @forked: a pointer to the Smack label for the forked task
313 * @gfp: type of the memory for the allocation
315 * Returns the new blob or NULL if there's no memory available
317 static struct task_smack
*new_task_smack(struct smack_known
*task
,
318 struct smack_known
*forked
, gfp_t gfp
)
320 struct task_smack
*tsp
;
322 tsp
= kzalloc(sizeof(struct task_smack
), gfp
);
326 tsp
->smk_task
= task
;
327 tsp
->smk_forked
= forked
;
328 INIT_LIST_HEAD(&tsp
->smk_rules
);
329 mutex_init(&tsp
->smk_rules_lock
);
335 * smk_copy_rules - copy a rule set
336 * @nhead: new rules header pointer
337 * @ohead: old rules header pointer
338 * @gfp: type of the memory for the allocation
340 * Returns 0 on success, -ENOMEM on error
342 static int smk_copy_rules(struct list_head
*nhead
, struct list_head
*ohead
,
345 struct smack_rule
*nrp
;
346 struct smack_rule
*orp
;
349 INIT_LIST_HEAD(nhead
);
351 list_for_each_entry_rcu(orp
, ohead
, list
) {
352 nrp
= kzalloc(sizeof(struct smack_rule
), gfp
);
358 list_add_rcu(&nrp
->list
, nhead
);
364 * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_*
365 * @mode - input mode in form of PTRACE_MODE_*
367 * Returns a converted MAY_* mode usable by smack rules
369 static inline unsigned int smk_ptrace_mode(unsigned int mode
)
372 case PTRACE_MODE_READ
:
374 case PTRACE_MODE_ATTACH
:
375 return MAY_READWRITE
;
382 * smk_ptrace_rule_check - helper for ptrace access
383 * @tracer: tracer process
384 * @tracee_known: label entry of the process that's about to be traced
385 * @mode: ptrace attachment mode (PTRACE_MODE_*)
386 * @func: name of the function that called us, used for audit
388 * Returns 0 on access granted, -error on error
390 static int smk_ptrace_rule_check(struct task_struct
*tracer
,
391 struct smack_known
*tracee_known
,
392 unsigned int mode
, const char *func
)
395 struct smk_audit_info ad
, *saip
= NULL
;
396 struct task_smack
*tsp
;
397 struct smack_known
*tracer_known
;
399 if ((mode
& PTRACE_MODE_NOAUDIT
) == 0) {
400 smk_ad_init(&ad
, func
, LSM_AUDIT_DATA_TASK
);
401 smk_ad_setfield_u_tsk(&ad
, tracer
);
406 tsp
= __task_cred(tracer
)->security
;
407 tracer_known
= smk_of_task(tsp
);
409 if ((mode
& PTRACE_MODE_ATTACH
) &&
410 (smack_ptrace_rule
== SMACK_PTRACE_EXACT
||
411 smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)) {
412 if (tracer_known
->smk_known
== tracee_known
->smk_known
)
414 else if (smack_ptrace_rule
== SMACK_PTRACE_DRACONIAN
)
416 else if (capable(CAP_SYS_PTRACE
))
422 smack_log(tracer_known
->smk_known
,
423 tracee_known
->smk_known
,
430 /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
431 rc
= smk_tskacc(tsp
, tracee_known
, smk_ptrace_mode(mode
), saip
);
439 * We he, that is fun!
443 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
444 * @ctp: child task pointer
445 * @mode: ptrace attachment mode (PTRACE_MODE_*)
447 * Returns 0 if access is OK, an error code otherwise
449 * Do the capability checks.
451 static int smack_ptrace_access_check(struct task_struct
*ctp
, unsigned int mode
)
453 struct smack_known
*skp
;
455 skp
= smk_of_task_struct(ctp
);
457 return smk_ptrace_rule_check(current
, skp
, mode
, __func__
);
461 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
462 * @ptp: parent task pointer
464 * Returns 0 if access is OK, an error code otherwise
466 * Do the capability checks, and require PTRACE_MODE_ATTACH.
468 static int smack_ptrace_traceme(struct task_struct
*ptp
)
471 struct smack_known
*skp
;
473 skp
= smk_of_task(current_security());
475 rc
= smk_ptrace_rule_check(ptp
, skp
, PTRACE_MODE_ATTACH
, __func__
);
480 * smack_syslog - Smack approval on syslog
481 * @type: message type
483 * Returns 0 on success, error code otherwise.
485 static int smack_syslog(int typefrom_file
)
488 struct smack_known
*skp
= smk_of_current();
490 if (smack_privileged(CAP_MAC_OVERRIDE
))
493 if (smack_syslog_label
!= NULL
&& smack_syslog_label
!= skp
)
505 * smack_sb_alloc_security - allocate a superblock blob
506 * @sb: the superblock getting the blob
508 * Returns 0 on success or -ENOMEM on error.
510 static int smack_sb_alloc_security(struct super_block
*sb
)
512 struct superblock_smack
*sbsp
;
514 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
519 sbsp
->smk_root
= &smack_known_floor
;
520 sbsp
->smk_default
= &smack_known_floor
;
521 sbsp
->smk_floor
= &smack_known_floor
;
522 sbsp
->smk_hat
= &smack_known_hat
;
524 * smk_initialized will be zero from kzalloc.
526 sb
->s_security
= sbsp
;
532 * smack_sb_free_security - free a superblock blob
533 * @sb: the superblock getting the blob
536 static void smack_sb_free_security(struct super_block
*sb
)
538 kfree(sb
->s_security
);
539 sb
->s_security
= NULL
;
543 * smack_sb_copy_data - copy mount options data for processing
544 * @orig: where to start
545 * @smackopts: mount options string
547 * Returns 0 on success or -ENOMEM on error.
549 * Copy the Smack specific mount options out of the mount
552 static int smack_sb_copy_data(char *orig
, char *smackopts
)
554 char *cp
, *commap
, *otheropts
, *dp
;
556 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
557 if (otheropts
== NULL
)
560 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
561 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
563 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
565 else if (strstr(cp
, SMK_FSHAT
) == cp
)
567 else if (strstr(cp
, SMK_FSROOT
) == cp
)
569 else if (strstr(cp
, SMK_FSTRANS
) == cp
)
574 commap
= strchr(cp
, ',');
583 strcpy(orig
, otheropts
);
584 free_page((unsigned long)otheropts
);
590 * smack_parse_opts_str - parse Smack specific mount options
591 * @options: mount options string
592 * @opts: where to store converted mount opts
594 * Returns 0 on success or -ENOMEM on error.
596 * converts Smack specific mount options to generic security option format
598 static int smack_parse_opts_str(char *options
,
599 struct security_mnt_opts
*opts
)
602 char *fsdefault
= NULL
;
603 char *fsfloor
= NULL
;
606 char *fstransmute
= NULL
;
608 int num_mnt_opts
= 0;
611 opts
->num_mnt_opts
= 0;
616 while ((p
= strsep(&options
, ",")) != NULL
) {
617 substring_t args
[MAX_OPT_ARGS
];
622 token
= match_token(p
, smk_mount_tokens
, args
);
628 fsdefault
= match_strdup(&args
[0]);
635 fsfloor
= match_strdup(&args
[0]);
642 fshat
= match_strdup(&args
[0]);
649 fsroot
= match_strdup(&args
[0]);
653 case Opt_fstransmute
:
656 fstransmute
= match_strdup(&args
[0]);
662 pr_warn("Smack: unknown mount option\n");
667 opts
->mnt_opts
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(char *), GFP_ATOMIC
);
671 opts
->mnt_opts_flags
= kcalloc(NUM_SMK_MNT_OPTS
, sizeof(int),
673 if (!opts
->mnt_opts_flags
) {
674 kfree(opts
->mnt_opts
);
679 opts
->mnt_opts
[num_mnt_opts
] = fsdefault
;
680 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSDEFAULT_MNT
;
683 opts
->mnt_opts
[num_mnt_opts
] = fsfloor
;
684 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSFLOOR_MNT
;
687 opts
->mnt_opts
[num_mnt_opts
] = fshat
;
688 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSHAT_MNT
;
691 opts
->mnt_opts
[num_mnt_opts
] = fsroot
;
692 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSROOT_MNT
;
695 opts
->mnt_opts
[num_mnt_opts
] = fstransmute
;
696 opts
->mnt_opts_flags
[num_mnt_opts
++] = FSTRANS_MNT
;
699 opts
->num_mnt_opts
= num_mnt_opts
;
704 pr_warn("Smack: duplicate mount options\n");
716 * smack_set_mnt_opts - set Smack specific mount options
717 * @sb: the file system superblock
718 * @opts: Smack mount options
719 * @kern_flags: mount option from kernel space or user space
720 * @set_kern_flags: where to store converted mount opts
722 * Returns 0 on success, an error code on failure
724 * Allow filesystems with binary mount data to explicitly set Smack mount
727 static int smack_set_mnt_opts(struct super_block
*sb
,
728 struct security_mnt_opts
*opts
,
729 unsigned long kern_flags
,
730 unsigned long *set_kern_flags
)
732 struct dentry
*root
= sb
->s_root
;
733 struct inode
*inode
= d_backing_inode(root
);
734 struct superblock_smack
*sp
= sb
->s_security
;
735 struct inode_smack
*isp
;
736 struct smack_known
*skp
;
738 int num_opts
= opts
->num_mnt_opts
;
741 if (sp
->smk_initialized
)
744 sp
->smk_initialized
= 1;
746 for (i
= 0; i
< num_opts
; i
++) {
747 switch (opts
->mnt_opts_flags
[i
]) {
749 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
752 sp
->smk_default
= skp
;
755 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
761 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
767 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
773 skp
= smk_import_entry(opts
->mnt_opts
[i
], 0);
784 if (!smack_privileged(CAP_MAC_ADMIN
)) {
786 * Unprivileged mounts don't get to specify Smack values.
791 * Unprivileged mounts get root and default from the caller.
793 skp
= smk_of_current();
795 sp
->smk_default
= skp
;
799 * Initialize the root inode.
801 isp
= inode
->i_security
;
803 isp
= new_inode_smack(sp
->smk_root
);
806 inode
->i_security
= isp
;
808 isp
->smk_inode
= sp
->smk_root
;
811 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
817 * smack_sb_kern_mount - Smack specific mount processing
818 * @sb: the file system superblock
819 * @flags: the mount flags
820 * @data: the smack mount options
822 * Returns 0 on success, an error code on failure
824 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
827 char *options
= data
;
828 struct security_mnt_opts opts
;
830 security_init_mnt_opts(&opts
);
835 rc
= smack_parse_opts_str(options
, &opts
);
840 rc
= smack_set_mnt_opts(sb
, &opts
, 0, NULL
);
843 security_free_mnt_opts(&opts
);
848 * smack_sb_statfs - Smack check on statfs
849 * @dentry: identifies the file system in question
851 * Returns 0 if current can read the floor of the filesystem,
852 * and error code otherwise
854 static int smack_sb_statfs(struct dentry
*dentry
)
856 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
858 struct smk_audit_info ad
;
860 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
861 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
863 rc
= smk_curacc(sbp
->smk_floor
, MAY_READ
, &ad
);
864 rc
= smk_bu_current("statfs", sbp
->smk_floor
, MAY_READ
, rc
);
873 * smack_bprm_set_creds - set creds for exec
874 * @bprm: the exec information
876 * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise
878 static int smack_bprm_set_creds(struct linux_binprm
*bprm
)
880 struct inode
*inode
= file_inode(bprm
->file
);
881 struct task_smack
*bsp
= bprm
->cred
->security
;
882 struct inode_smack
*isp
;
885 if (bprm
->cred_prepared
)
888 isp
= inode
->i_security
;
889 if (isp
->smk_task
== NULL
|| isp
->smk_task
== bsp
->smk_task
)
892 if (bprm
->unsafe
& (LSM_UNSAFE_PTRACE
| LSM_UNSAFE_PTRACE_CAP
)) {
893 struct task_struct
*tracer
;
897 tracer
= ptrace_parent(current
);
898 if (likely(tracer
!= NULL
))
899 rc
= smk_ptrace_rule_check(tracer
,
907 } else if (bprm
->unsafe
)
910 bsp
->smk_task
= isp
->smk_task
;
911 bprm
->per_clear
|= PER_CLEAR_ON_SETID
;
917 * smack_bprm_committing_creds - Prepare to install the new credentials
920 * @bprm: binprm for exec
922 static void smack_bprm_committing_creds(struct linux_binprm
*bprm
)
924 struct task_smack
*bsp
= bprm
->cred
->security
;
926 if (bsp
->smk_task
!= bsp
->smk_forked
)
927 current
->pdeath_signal
= 0;
931 * smack_bprm_secureexec - Return the decision to use secureexec.
932 * @bprm: binprm for exec
934 * Returns 0 on success.
936 static int smack_bprm_secureexec(struct linux_binprm
*bprm
)
938 struct task_smack
*tsp
= current_security();
940 if (tsp
->smk_task
!= tsp
->smk_forked
)
951 * smack_inode_alloc_security - allocate an inode blob
952 * @inode: the inode in need of a blob
954 * Returns 0 if it gets a blob, -ENOMEM otherwise
956 static int smack_inode_alloc_security(struct inode
*inode
)
958 struct smack_known
*skp
= smk_of_current();
960 inode
->i_security
= new_inode_smack(skp
);
961 if (inode
->i_security
== NULL
)
967 * smack_inode_free_security - free an inode blob
968 * @inode: the inode with a blob
970 * Clears the blob pointer in inode
972 static void smack_inode_free_security(struct inode
*inode
)
974 kmem_cache_free(smack_inode_cache
, inode
->i_security
);
975 inode
->i_security
= NULL
;
979 * smack_inode_init_security - copy out the smack from an inode
980 * @inode: the newly created inode
981 * @dir: containing directory object
983 * @name: where to put the attribute name
984 * @value: where to put the attribute value
985 * @len: where to put the length of the attribute
987 * Returns 0 if it all works out, -ENOMEM if there's no memory
989 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
990 const struct qstr
*qstr
, const char **name
,
991 void **value
, size_t *len
)
993 struct inode_smack
*issp
= inode
->i_security
;
994 struct smack_known
*skp
= smk_of_current();
995 struct smack_known
*isp
= smk_of_inode(inode
);
996 struct smack_known
*dsp
= smk_of_inode(dir
);
1000 *name
= XATTR_SMACK_SUFFIX
;
1004 may
= smk_access_entry(skp
->smk_known
, dsp
->smk_known
,
1009 * If the access rule allows transmutation and
1010 * the directory requests transmutation then
1011 * by all means transmute.
1012 * Mark the inode as changed.
1014 if (may
> 0 && ((may
& MAY_TRANSMUTE
) != 0) &&
1015 smk_inode_transmutable(dir
)) {
1017 issp
->smk_flags
|= SMK_INODE_CHANGED
;
1020 *value
= kstrdup(isp
->smk_known
, GFP_NOFS
);
1024 *len
= strlen(isp
->smk_known
);
1031 * smack_inode_link - Smack check on link
1032 * @old_dentry: the existing object
1034 * @new_dentry: the new object
1036 * Returns 0 if access is permitted, an error code otherwise
1038 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
1039 struct dentry
*new_dentry
)
1041 struct smack_known
*isp
;
1042 struct smk_audit_info ad
;
1045 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1046 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1048 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1049 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1050 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_WRITE
, rc
);
1052 if (rc
== 0 && d_is_positive(new_dentry
)) {
1053 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1054 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1055 rc
= smk_curacc(isp
, MAY_WRITE
, &ad
);
1056 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_WRITE
, rc
);
1063 * smack_inode_unlink - Smack check on inode deletion
1064 * @dir: containing directory object
1065 * @dentry: file to unlink
1067 * Returns 0 if current can write the containing directory
1068 * and the object, error code otherwise
1070 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
1072 struct inode
*ip
= d_backing_inode(dentry
);
1073 struct smk_audit_info ad
;
1076 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1077 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1080 * You need write access to the thing you're unlinking
1082 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
, &ad
);
1083 rc
= smk_bu_inode(ip
, MAY_WRITE
, rc
);
1086 * You also need write access to the containing directory
1088 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1089 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1090 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1091 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1097 * smack_inode_rmdir - Smack check on directory deletion
1098 * @dir: containing directory object
1099 * @dentry: directory to unlink
1101 * Returns 0 if current can write the containing directory
1102 * and the directory, error code otherwise
1104 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1106 struct smk_audit_info ad
;
1109 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1110 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1113 * You need write access to the thing you're removing
1115 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1116 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1119 * You also need write access to the containing directory
1121 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1122 smk_ad_setfield_u_fs_inode(&ad
, dir
);
1123 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
, &ad
);
1124 rc
= smk_bu_inode(dir
, MAY_WRITE
, rc
);
1131 * smack_inode_rename - Smack check on rename
1132 * @old_inode: unused
1133 * @old_dentry: the old object
1134 * @new_inode: unused
1135 * @new_dentry: the new object
1137 * Read and write access is required on both the old and
1140 * Returns 0 if access is permitted, an error code otherwise
1142 static int smack_inode_rename(struct inode
*old_inode
,
1143 struct dentry
*old_dentry
,
1144 struct inode
*new_inode
,
1145 struct dentry
*new_dentry
)
1148 struct smack_known
*isp
;
1149 struct smk_audit_info ad
;
1151 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1152 smk_ad_setfield_u_fs_path_dentry(&ad
, old_dentry
);
1154 isp
= smk_of_inode(d_backing_inode(old_dentry
));
1155 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1156 rc
= smk_bu_inode(d_backing_inode(old_dentry
), MAY_READWRITE
, rc
);
1158 if (rc
== 0 && d_is_positive(new_dentry
)) {
1159 isp
= smk_of_inode(d_backing_inode(new_dentry
));
1160 smk_ad_setfield_u_fs_path_dentry(&ad
, new_dentry
);
1161 rc
= smk_curacc(isp
, MAY_READWRITE
, &ad
);
1162 rc
= smk_bu_inode(d_backing_inode(new_dentry
), MAY_READWRITE
, rc
);
1168 * smack_inode_permission - Smack version of permission()
1169 * @inode: the inode in question
1170 * @mask: the access requested
1172 * This is the important Smack hook.
1174 * Returns 0 if access is permitted, -EACCES otherwise
1176 static int smack_inode_permission(struct inode
*inode
, int mask
)
1178 struct smk_audit_info ad
;
1179 int no_block
= mask
& MAY_NOT_BLOCK
;
1182 mask
&= (MAY_READ
|MAY_WRITE
|MAY_EXEC
|MAY_APPEND
);
1184 * No permission to check. Existence test. Yup, it's there.
1189 /* May be droppable after audit */
1192 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_INODE
);
1193 smk_ad_setfield_u_fs_inode(&ad
, inode
);
1194 rc
= smk_curacc(smk_of_inode(inode
), mask
, &ad
);
1195 rc
= smk_bu_inode(inode
, mask
, rc
);
1200 * smack_inode_setattr - Smack check for setting attributes
1201 * @dentry: the object
1202 * @iattr: for the force flag
1204 * Returns 0 if access is permitted, an error code otherwise
1206 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
1208 struct smk_audit_info ad
;
1212 * Need to allow for clearing the setuid bit.
1214 if (iattr
->ia_valid
& ATTR_FORCE
)
1216 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1217 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1219 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1220 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1225 * smack_inode_getattr - Smack check for getting attributes
1226 * @mnt: vfsmount of the object
1227 * @dentry: the object
1229 * Returns 0 if access is permitted, an error code otherwise
1231 static int smack_inode_getattr(const struct path
*path
)
1233 struct smk_audit_info ad
;
1234 struct inode
*inode
= d_backing_inode(path
->dentry
);
1237 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1238 smk_ad_setfield_u_fs_path(&ad
, *path
);
1239 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1240 rc
= smk_bu_inode(inode
, MAY_READ
, rc
);
1245 * smack_inode_setxattr - Smack check for setting xattrs
1246 * @dentry: the object
1247 * @name: name of the attribute
1248 * @value: value of the attribute
1249 * @size: size of the value
1252 * This protects the Smack attribute explicitly.
1254 * Returns 0 if access is permitted, an error code otherwise
1256 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
1257 const void *value
, size_t size
, int flags
)
1259 struct smk_audit_info ad
;
1260 struct smack_known
*skp
;
1262 int check_import
= 0;
1267 * Check label validity here so import won't fail in post_setxattr
1269 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1270 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1271 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
1274 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1275 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1279 } else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1281 if (size
!= TRANS_TRUE_SIZE
||
1282 strncmp(value
, TRANS_TRUE
, TRANS_TRUE_SIZE
) != 0)
1285 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
1287 if (check_priv
&& !smack_privileged(CAP_MAC_ADMIN
))
1290 if (rc
== 0 && check_import
) {
1291 skp
= size
? smk_import_entry(value
, size
) : NULL
;
1294 else if (skp
== NULL
|| (check_star
&&
1295 (skp
== &smack_known_star
|| skp
== &smack_known_web
)))
1299 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1300 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1303 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1304 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1311 * smack_inode_post_setxattr - Apply the Smack update approved above
1313 * @name: attribute name
1314 * @value: attribute value
1315 * @size: attribute size
1318 * Set the pointer in the inode blob to the entry found
1319 * in the master label list.
1321 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
1322 const void *value
, size_t size
, int flags
)
1324 struct smack_known
*skp
;
1325 struct inode_smack
*isp
= d_backing_inode(dentry
)->i_security
;
1327 if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0) {
1328 isp
->smk_flags
|= SMK_INODE_TRANSMUTE
;
1332 if (strcmp(name
, XATTR_NAME_SMACK
) == 0) {
1333 skp
= smk_import_entry(value
, size
);
1335 isp
->smk_inode
= skp
;
1337 isp
->smk_inode
= &smack_known_invalid
;
1338 } else if (strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0) {
1339 skp
= smk_import_entry(value
, size
);
1341 isp
->smk_task
= skp
;
1343 isp
->smk_task
= &smack_known_invalid
;
1344 } else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1345 skp
= smk_import_entry(value
, size
);
1347 isp
->smk_mmap
= skp
;
1349 isp
->smk_mmap
= &smack_known_invalid
;
1356 * smack_inode_getxattr - Smack check on getxattr
1357 * @dentry: the object
1360 * Returns 0 if access is permitted, an error code otherwise
1362 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
1364 struct smk_audit_info ad
;
1367 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1368 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1370 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_READ
, &ad
);
1371 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_READ
, rc
);
1376 * smack_inode_removexattr - Smack check on removexattr
1377 * @dentry: the object
1378 * @name: name of the attribute
1380 * Removing the Smack attribute requires CAP_MAC_ADMIN
1382 * Returns 0 if access is permitted, an error code otherwise
1384 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
1386 struct inode_smack
*isp
;
1387 struct smk_audit_info ad
;
1390 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
1391 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
1392 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0 ||
1393 strcmp(name
, XATTR_NAME_SMACKEXEC
) == 0 ||
1394 strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0 ||
1395 strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0) {
1396 if (!smack_privileged(CAP_MAC_ADMIN
))
1399 rc
= cap_inode_removexattr(dentry
, name
);
1404 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_DENTRY
);
1405 smk_ad_setfield_u_fs_path_dentry(&ad
, dentry
);
1407 rc
= smk_curacc(smk_of_inode(d_backing_inode(dentry
)), MAY_WRITE
, &ad
);
1408 rc
= smk_bu_inode(d_backing_inode(dentry
), MAY_WRITE
, rc
);
1412 isp
= d_backing_inode(dentry
)->i_security
;
1414 * Don't do anything special for these.
1415 * XATTR_NAME_SMACKIPIN
1416 * XATTR_NAME_SMACKIPOUT
1417 * XATTR_NAME_SMACKEXEC
1419 if (strcmp(name
, XATTR_NAME_SMACK
) == 0)
1420 isp
->smk_task
= NULL
;
1421 else if (strcmp(name
, XATTR_NAME_SMACKMMAP
) == 0)
1422 isp
->smk_mmap
= NULL
;
1423 else if (strcmp(name
, XATTR_NAME_SMACKTRANSMUTE
) == 0)
1424 isp
->smk_flags
&= ~SMK_INODE_TRANSMUTE
;
1430 * smack_inode_getsecurity - get smack xattrs
1431 * @inode: the object
1432 * @name: attribute name
1433 * @buffer: where to put the result
1436 * Returns the size of the attribute or an error code
1438 static int smack_inode_getsecurity(const struct inode
*inode
,
1439 const char *name
, void **buffer
,
1442 struct socket_smack
*ssp
;
1443 struct socket
*sock
;
1444 struct super_block
*sbp
;
1445 struct inode
*ip
= (struct inode
*)inode
;
1446 struct smack_known
*isp
;
1450 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1451 isp
= smk_of_inode(inode
);
1452 ilen
= strlen(isp
->smk_known
);
1453 *buffer
= isp
->smk_known
;
1458 * The rest of the Smack xattrs are only on sockets.
1461 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
1464 sock
= SOCKET_I(ip
);
1465 if (sock
== NULL
|| sock
->sk
== NULL
)
1468 ssp
= sock
->sk
->sk_security
;
1470 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1472 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
1477 ilen
= strlen(isp
->smk_known
);
1479 *buffer
= isp
->smk_known
;
1488 * smack_inode_listsecurity - list the Smack attributes
1489 * @inode: the object
1490 * @buffer: where they go
1491 * @buffer_size: size of buffer
1493 * Returns 0 on success, -EINVAL otherwise
1495 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
1498 int len
= sizeof(XATTR_NAME_SMACK
);
1500 if (buffer
!= NULL
&& len
<= buffer_size
)
1501 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
1507 * smack_inode_getsecid - Extract inode's security id
1508 * @inode: inode to extract the info from
1509 * @secid: where result will be saved
1511 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
1513 struct inode_smack
*isp
= inode
->i_security
;
1515 *secid
= isp
->smk_inode
->smk_secid
;
1523 * smack_file_permission - Smack check on file operations
1529 * Should access checks be done on each read or write?
1530 * UNICOS and SELinux say yes.
1531 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1533 * I'll say no for now. Smack does not do the frequent
1534 * label changing that SELinux does.
1536 static int smack_file_permission(struct file
*file
, int mask
)
1542 * smack_file_alloc_security - assign a file security blob
1545 * The security blob for a file is a pointer to the master
1546 * label list, so no allocation is done.
1548 * f_security is the owner security information. It
1549 * isn't used on file access checks, it's for send_sigio.
1553 static int smack_file_alloc_security(struct file
*file
)
1555 struct smack_known
*skp
= smk_of_current();
1557 file
->f_security
= skp
;
1562 * smack_file_free_security - clear a file security blob
1565 * The security blob for a file is a pointer to the master
1566 * label list, so no memory is freed.
1568 static void smack_file_free_security(struct file
*file
)
1570 file
->f_security
= NULL
;
1574 * smack_file_ioctl - Smack check on ioctls
1579 * Relies heavily on the correct use of the ioctl command conventions.
1581 * Returns 0 if allowed, error code otherwise
1583 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
1587 struct smk_audit_info ad
;
1588 struct inode
*inode
= file_inode(file
);
1590 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1591 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1593 if (_IOC_DIR(cmd
) & _IOC_WRITE
) {
1594 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1595 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1598 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
)) {
1599 rc
= smk_curacc(smk_of_inode(inode
), MAY_READ
, &ad
);
1600 rc
= smk_bu_file(file
, MAY_READ
, rc
);
1607 * smack_file_lock - Smack check on file locking
1611 * Returns 0 if current has lock access, error code otherwise
1613 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
1615 struct smk_audit_info ad
;
1617 struct inode
*inode
= file_inode(file
);
1619 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1620 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1621 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1622 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1627 * smack_file_fcntl - Smack check on fcntl
1629 * @cmd: what action to check
1632 * Generally these operations are harmless.
1633 * File locking operations present an obvious mechanism
1634 * for passing information, so they require write access.
1636 * Returns 0 if current has access, error code otherwise
1638 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
1641 struct smk_audit_info ad
;
1643 struct inode
*inode
= file_inode(file
);
1650 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1651 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1652 rc
= smk_curacc(smk_of_inode(inode
), MAY_LOCK
, &ad
);
1653 rc
= smk_bu_file(file
, MAY_LOCK
, rc
);
1657 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1658 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1659 rc
= smk_curacc(smk_of_inode(inode
), MAY_WRITE
, &ad
);
1660 rc
= smk_bu_file(file
, MAY_WRITE
, rc
);
1671 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1672 * if mapping anonymous memory.
1673 * @file contains the file structure for file to map (may be NULL).
1674 * @reqprot contains the protection requested by the application.
1675 * @prot contains the protection that will be applied by the kernel.
1676 * @flags contains the operational flags.
1677 * Return 0 if permission is granted.
1679 static int smack_mmap_file(struct file
*file
,
1680 unsigned long reqprot
, unsigned long prot
,
1681 unsigned long flags
)
1683 struct smack_known
*skp
;
1684 struct smack_known
*mkp
;
1685 struct smack_rule
*srp
;
1686 struct task_smack
*tsp
;
1687 struct smack_known
*okp
;
1688 struct inode_smack
*isp
;
1697 isp
= file_inode(file
)->i_security
;
1698 if (isp
->smk_mmap
== NULL
)
1700 mkp
= isp
->smk_mmap
;
1702 tsp
= current_security();
1703 skp
= smk_of_current();
1708 * For each Smack rule associated with the subject
1709 * label verify that the SMACK64MMAP also has access
1710 * to that rule's object label.
1712 list_for_each_entry_rcu(srp
, &skp
->smk_rules
, list
) {
1713 okp
= srp
->smk_object
;
1715 * Matching labels always allows access.
1717 if (mkp
->smk_known
== okp
->smk_known
)
1720 * If there is a matching local rule take
1721 * that into account as well.
1723 may
= smk_access_entry(srp
->smk_subject
->smk_known
,
1727 may
= srp
->smk_access
;
1729 may
&= srp
->smk_access
;
1731 * If may is zero the SMACK64MMAP subject can't
1732 * possibly have less access.
1738 * Fetch the global list entry.
1739 * If there isn't one a SMACK64MMAP subject
1740 * can't have as much access as current.
1742 mmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1744 if (mmay
== -ENOENT
) {
1749 * If there is a local entry it modifies the
1750 * potential access, too.
1752 tmay
= smk_access_entry(mkp
->smk_known
, okp
->smk_known
,
1754 if (tmay
!= -ENOENT
)
1758 * If there is any access available to current that is
1759 * not available to a SMACK64MMAP subject
1762 if ((may
| mmay
) != mmay
) {
1774 * smack_file_set_fowner - set the file security blob value
1775 * @file: object in question
1778 static void smack_file_set_fowner(struct file
*file
)
1780 file
->f_security
= smk_of_current();
1784 * smack_file_send_sigiotask - Smack on sigio
1785 * @tsk: The target task
1786 * @fown: the object the signal come from
1789 * Allow a privileged task to get signals even if it shouldn't
1791 * Returns 0 if a subject with the object's smack could
1792 * write to the task, an error code otherwise.
1794 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
1795 struct fown_struct
*fown
, int signum
)
1797 struct smack_known
*skp
;
1798 struct smack_known
*tkp
= smk_of_task(tsk
->cred
->security
);
1801 struct smk_audit_info ad
;
1804 * struct fown_struct is never outside the context of a struct file
1806 file
= container_of(fown
, struct file
, f_owner
);
1808 /* we don't log here as rc can be overriden */
1809 skp
= file
->f_security
;
1810 rc
= smk_access(skp
, tkp
, MAY_WRITE
, NULL
);
1811 rc
= smk_bu_note("sigiotask", skp
, tkp
, MAY_WRITE
, rc
);
1812 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
1815 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
1816 smk_ad_setfield_u_tsk(&ad
, tsk
);
1817 smack_log(skp
->smk_known
, tkp
->smk_known
, MAY_WRITE
, rc
, &ad
);
1822 * smack_file_receive - Smack file receive check
1825 * Returns 0 if current has access, error code otherwise
1827 static int smack_file_receive(struct file
*file
)
1831 struct smk_audit_info ad
;
1832 struct inode
*inode
= file_inode(file
);
1834 if (unlikely(IS_PRIVATE(inode
)))
1837 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1838 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1840 * This code relies on bitmasks.
1842 if (file
->f_mode
& FMODE_READ
)
1844 if (file
->f_mode
& FMODE_WRITE
)
1847 rc
= smk_curacc(smk_of_inode(inode
), may
, &ad
);
1848 rc
= smk_bu_file(file
, may
, rc
);
1853 * smack_file_open - Smack dentry open processing
1855 * @cred: task credential
1857 * Set the security blob in the file structure.
1858 * Allow the open only if the task has read access. There are
1859 * many read operations (e.g. fstat) that you can do with an
1860 * fd even if you have the file open write-only.
1864 static int smack_file_open(struct file
*file
, const struct cred
*cred
)
1866 struct task_smack
*tsp
= cred
->security
;
1867 struct inode
*inode
= file_inode(file
);
1868 struct smk_audit_info ad
;
1871 if (smack_privileged(CAP_MAC_OVERRIDE
))
1874 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_PATH
);
1875 smk_ad_setfield_u_fs_path(&ad
, file
->f_path
);
1876 rc
= smk_access(tsp
->smk_task
, smk_of_inode(inode
), MAY_READ
, &ad
);
1877 rc
= smk_bu_credfile(cred
, file
, MAY_READ
, rc
);
1887 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1888 * @new: the new credentials
1889 * @gfp: the atomicity of any memory allocations
1891 * Prepare a blank set of credentials for modification. This must allocate all
1892 * the memory the LSM module might require such that cred_transfer() can
1893 * complete without error.
1895 static int smack_cred_alloc_blank(struct cred
*cred
, gfp_t gfp
)
1897 struct task_smack
*tsp
;
1899 tsp
= new_task_smack(NULL
, NULL
, gfp
);
1903 cred
->security
= tsp
;
1910 * smack_cred_free - "free" task-level security credentials
1911 * @cred: the credentials in question
1914 static void smack_cred_free(struct cred
*cred
)
1916 struct task_smack
*tsp
= cred
->security
;
1917 struct smack_rule
*rp
;
1918 struct list_head
*l
;
1919 struct list_head
*n
;
1923 cred
->security
= NULL
;
1925 list_for_each_safe(l
, n
, &tsp
->smk_rules
) {
1926 rp
= list_entry(l
, struct smack_rule
, list
);
1927 list_del(&rp
->list
);
1934 * smack_cred_prepare - prepare new set of credentials for modification
1935 * @new: the new credentials
1936 * @old: the original credentials
1937 * @gfp: the atomicity of any memory allocations
1939 * Prepare a new set of credentials for modification.
1941 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1944 struct task_smack
*old_tsp
= old
->security
;
1945 struct task_smack
*new_tsp
;
1948 new_tsp
= new_task_smack(old_tsp
->smk_task
, old_tsp
->smk_task
, gfp
);
1949 if (new_tsp
== NULL
)
1952 rc
= smk_copy_rules(&new_tsp
->smk_rules
, &old_tsp
->smk_rules
, gfp
);
1956 new->security
= new_tsp
;
1961 * smack_cred_transfer - Transfer the old credentials to the new credentials
1962 * @new: the new credentials
1963 * @old: the original credentials
1965 * Fill in a set of blank credentials from another set of credentials.
1967 static void smack_cred_transfer(struct cred
*new, const struct cred
*old
)
1969 struct task_smack
*old_tsp
= old
->security
;
1970 struct task_smack
*new_tsp
= new->security
;
1972 new_tsp
->smk_task
= old_tsp
->smk_task
;
1973 new_tsp
->smk_forked
= old_tsp
->smk_task
;
1974 mutex_init(&new_tsp
->smk_rules_lock
);
1975 INIT_LIST_HEAD(&new_tsp
->smk_rules
);
1978 /* cbs copy rule list */
1982 * smack_kernel_act_as - Set the subjective context in a set of credentials
1983 * @new: points to the set of credentials to be modified.
1984 * @secid: specifies the security ID to be set
1986 * Set the security data for a kernel service.
1988 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1990 struct task_smack
*new_tsp
= new->security
;
1991 struct smack_known
*skp
= smack_from_secid(secid
);
1996 new_tsp
->smk_task
= skp
;
2001 * smack_kernel_create_files_as - Set the file creation label in a set of creds
2002 * @new: points to the set of credentials to be modified
2003 * @inode: points to the inode to use as a reference
2005 * Set the file creation context in a set of credentials to the same
2006 * as the objective context of the specified inode
2008 static int smack_kernel_create_files_as(struct cred
*new,
2009 struct inode
*inode
)
2011 struct inode_smack
*isp
= inode
->i_security
;
2012 struct task_smack
*tsp
= new->security
;
2014 tsp
->smk_forked
= isp
->smk_inode
;
2015 tsp
->smk_task
= tsp
->smk_forked
;
2020 * smk_curacc_on_task - helper to log task related access
2021 * @p: the task object
2022 * @access: the access requested
2023 * @caller: name of the calling function for audit
2025 * Return 0 if access is permitted
2027 static int smk_curacc_on_task(struct task_struct
*p
, int access
,
2030 struct smk_audit_info ad
;
2031 struct smack_known
*skp
= smk_of_task_struct(p
);
2034 smk_ad_init(&ad
, caller
, LSM_AUDIT_DATA_TASK
);
2035 smk_ad_setfield_u_tsk(&ad
, p
);
2036 rc
= smk_curacc(skp
, access
, &ad
);
2037 rc
= smk_bu_task(p
, access
, rc
);
2042 * smack_task_setpgid - Smack check on setting pgid
2043 * @p: the task object
2046 * Return 0 if write access is permitted
2048 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
2050 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2054 * smack_task_getpgid - Smack access check for getpgid
2055 * @p: the object task
2057 * Returns 0 if current can read the object task, error code otherwise
2059 static int smack_task_getpgid(struct task_struct
*p
)
2061 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2065 * smack_task_getsid - Smack access check for getsid
2066 * @p: the object task
2068 * Returns 0 if current can read the object task, error code otherwise
2070 static int smack_task_getsid(struct task_struct
*p
)
2072 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2076 * smack_task_getsecid - get the secid of the task
2077 * @p: the object task
2078 * @secid: where to put the result
2080 * Sets the secid to contain a u32 version of the smack label.
2082 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
2084 struct smack_known
*skp
= smk_of_task_struct(p
);
2086 *secid
= skp
->smk_secid
;
2090 * smack_task_setnice - Smack check on setting nice
2091 * @p: the task object
2094 * Return 0 if write access is permitted
2096 static int smack_task_setnice(struct task_struct
*p
, int nice
)
2098 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2102 * smack_task_setioprio - Smack check on setting ioprio
2103 * @p: the task object
2106 * Return 0 if write access is permitted
2108 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
2110 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2114 * smack_task_getioprio - Smack check on reading ioprio
2115 * @p: the task object
2117 * Return 0 if read access is permitted
2119 static int smack_task_getioprio(struct task_struct
*p
)
2121 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2125 * smack_task_setscheduler - Smack check on setting scheduler
2126 * @p: the task object
2130 * Return 0 if read access is permitted
2132 static int smack_task_setscheduler(struct task_struct
*p
)
2134 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2138 * smack_task_getscheduler - Smack check on reading scheduler
2139 * @p: the task object
2141 * Return 0 if read access is permitted
2143 static int smack_task_getscheduler(struct task_struct
*p
)
2145 return smk_curacc_on_task(p
, MAY_READ
, __func__
);
2149 * smack_task_movememory - Smack check on moving memory
2150 * @p: the task object
2152 * Return 0 if write access is permitted
2154 static int smack_task_movememory(struct task_struct
*p
)
2156 return smk_curacc_on_task(p
, MAY_WRITE
, __func__
);
2160 * smack_task_kill - Smack check on signal delivery
2161 * @p: the task object
2164 * @secid: identifies the smack to use in lieu of current's
2166 * Return 0 if write access is permitted
2168 * The secid behavior is an artifact of an SELinux hack
2169 * in the USB code. Someday it may go away.
2171 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
2174 struct smk_audit_info ad
;
2175 struct smack_known
*skp
;
2176 struct smack_known
*tkp
= smk_of_task_struct(p
);
2179 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_TASK
);
2180 smk_ad_setfield_u_tsk(&ad
, p
);
2182 * Sending a signal requires that the sender
2183 * can write the receiver.
2186 rc
= smk_curacc(tkp
, MAY_WRITE
, &ad
);
2187 rc
= smk_bu_task(p
, MAY_WRITE
, rc
);
2191 * If the secid isn't 0 we're dealing with some USB IO
2192 * specific behavior. This is not clean. For one thing
2193 * we can't take privilege into account.
2195 skp
= smack_from_secid(secid
);
2196 rc
= smk_access(skp
, tkp
, MAY_WRITE
, &ad
);
2197 rc
= smk_bu_note("USB signal", skp
, tkp
, MAY_WRITE
, rc
);
2202 * smack_task_wait - Smack access check for waiting
2203 * @p: task to wait for
2207 static int smack_task_wait(struct task_struct
*p
)
2210 * Allow the operation to succeed.
2212 * In userless environments (e.g. phones) programs
2213 * get marked with SMACK64EXEC and even if the parent
2214 * and child shouldn't be talking the parent still
2215 * may expect to know when the child exits.
2221 * smack_task_to_inode - copy task smack into the inode blob
2222 * @p: task to copy from
2223 * @inode: inode to copy to
2225 * Sets the smack pointer in the inode security blob
2227 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
2229 struct inode_smack
*isp
= inode
->i_security
;
2230 struct smack_known
*skp
= smk_of_task_struct(p
);
2232 isp
->smk_inode
= skp
;
2240 * smack_sk_alloc_security - Allocate a socket blob
2243 * @gfp_flags: memory allocation flags
2245 * Assign Smack pointers to current
2247 * Returns 0 on success, -ENOMEM is there's no memory
2249 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
2251 struct smack_known
*skp
= smk_of_current();
2252 struct socket_smack
*ssp
;
2254 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
2260 ssp
->smk_packet
= NULL
;
2262 sk
->sk_security
= ssp
;
2268 * smack_sk_free_security - Free a socket blob
2271 * Clears the blob pointer
2273 static void smack_sk_free_security(struct sock
*sk
)
2275 kfree(sk
->sk_security
);
2279 * smack_ipv4host_label - check host based restrictions
2280 * @sip: the object end
2282 * looks for host based access restrictions
2284 * This version will only be appropriate for really small sets of single label
2285 * hosts. The caller is responsible for ensuring that the RCU read lock is
2286 * taken before calling this function.
2288 * Returns the label of the far end or NULL if it's not special.
2290 static struct smack_known
*smack_ipv4host_label(struct sockaddr_in
*sip
)
2292 struct smk_net4addr
*snp
;
2293 struct in_addr
*siap
= &sip
->sin_addr
;
2295 if (siap
->s_addr
== 0)
2298 list_for_each_entry_rcu(snp
, &smk_net4addr_list
, list
)
2300 * we break after finding the first match because
2301 * the list is sorted from longest to shortest mask
2302 * so we have found the most specific match
2304 if (snp
->smk_host
.s_addr
==
2305 (siap
->s_addr
& snp
->smk_mask
.s_addr
))
2306 return snp
->smk_label
;
2311 #if IS_ENABLED(CONFIG_IPV6)
2313 * smk_ipv6_localhost - Check for local ipv6 host address
2316 * Returns boolean true if this is the localhost address
2318 static bool smk_ipv6_localhost(struct sockaddr_in6
*sip
)
2320 __be16
*be16p
= (__be16
*)&sip
->sin6_addr
;
2321 __be32
*be32p
= (__be32
*)&sip
->sin6_addr
;
2323 if (be32p
[0] == 0 && be32p
[1] == 0 && be32p
[2] == 0 && be16p
[6] == 0 &&
2324 ntohs(be16p
[7]) == 1)
2330 * smack_ipv6host_label - check host based restrictions
2331 * @sip: the object end
2333 * looks for host based access restrictions
2335 * This version will only be appropriate for really small sets of single label
2336 * hosts. The caller is responsible for ensuring that the RCU read lock is
2337 * taken before calling this function.
2339 * Returns the label of the far end or NULL if it's not special.
2341 static struct smack_known
*smack_ipv6host_label(struct sockaddr_in6
*sip
)
2343 struct smk_net6addr
*snp
;
2344 struct in6_addr
*sap
= &sip
->sin6_addr
;
2349 * It's local. Don't look for a host label.
2351 if (smk_ipv6_localhost(sip
))
2354 list_for_each_entry_rcu(snp
, &smk_net6addr_list
, list
) {
2356 * we break after finding the first match because
2357 * the list is sorted from longest to shortest mask
2358 * so we have found the most specific match
2360 for (found
= 1, i
= 0; i
< 8; i
++) {
2362 * If the label is NULL the entry has
2363 * been renounced. Ignore it.
2365 if (snp
->smk_label
== NULL
)
2367 if ((sap
->s6_addr16
[i
] & snp
->smk_mask
.s6_addr16
[i
]) !=
2368 snp
->smk_host
.s6_addr16
[i
]) {
2374 return snp
->smk_label
;
2379 #endif /* CONFIG_IPV6 */
2382 * smack_netlabel - Set the secattr on a socket
2384 * @labeled: socket label scheme
2386 * Convert the outbound smack value (smk_out) to a
2387 * secattr and attach it to the socket.
2389 * Returns 0 on success or an error code
2391 static int smack_netlabel(struct sock
*sk
, int labeled
)
2393 struct smack_known
*skp
;
2394 struct socket_smack
*ssp
= sk
->sk_security
;
2398 * Usually the netlabel code will handle changing the
2399 * packet labeling based on the label.
2400 * The case of a single label host is different, because
2401 * a single label host should never get a labeled packet
2402 * even though the label is usually associated with a packet
2406 bh_lock_sock_nested(sk
);
2408 if (ssp
->smk_out
== smack_net_ambient
||
2409 labeled
== SMACK_UNLABELED_SOCKET
)
2410 netlbl_sock_delattr(sk
);
2413 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &skp
->smk_netlabel
);
2423 * smack_netlbel_send - Set the secattr on a socket and perform access checks
2425 * @sap: the destination address
2427 * Set the correct secattr for the given socket based on the destination
2428 * address and perform any outbound access checks needed.
2430 * Returns 0 on success or an error code.
2433 static int smack_netlabel_send(struct sock
*sk
, struct sockaddr_in
*sap
)
2435 struct smack_known
*skp
;
2438 struct smack_known
*hkp
;
2439 struct socket_smack
*ssp
= sk
->sk_security
;
2440 struct smk_audit_info ad
;
2443 hkp
= smack_ipv4host_label(sap
);
2446 struct lsm_network_audit net
;
2448 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2449 ad
.a
.u
.net
->family
= sap
->sin_family
;
2450 ad
.a
.u
.net
->dport
= sap
->sin_port
;
2451 ad
.a
.u
.net
->v4info
.daddr
= sap
->sin_addr
.s_addr
;
2453 sk_lbl
= SMACK_UNLABELED_SOCKET
;
2455 rc
= smk_access(skp
, hkp
, MAY_WRITE
, &ad
);
2456 rc
= smk_bu_note("IPv4 host check", skp
, hkp
, MAY_WRITE
, rc
);
2458 sk_lbl
= SMACK_CIPSO_SOCKET
;
2465 return smack_netlabel(sk
, sk_lbl
);
2468 #if IS_ENABLED(CONFIG_IPV6)
2470 * smk_ipv6_check - check Smack access
2471 * @subject: subject Smack label
2472 * @object: object Smack label
2474 * @act: the action being taken
2476 * Check an IPv6 access
2478 static int smk_ipv6_check(struct smack_known
*subject
,
2479 struct smack_known
*object
,
2480 struct sockaddr_in6
*address
, int act
)
2483 struct lsm_network_audit net
;
2485 struct smk_audit_info ad
;
2489 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
2490 ad
.a
.u
.net
->family
= PF_INET6
;
2491 ad
.a
.u
.net
->dport
= ntohs(address
->sin6_port
);
2492 if (act
== SMK_RECEIVING
)
2493 ad
.a
.u
.net
->v6info
.saddr
= address
->sin6_addr
;
2495 ad
.a
.u
.net
->v6info
.daddr
= address
->sin6_addr
;
2497 rc
= smk_access(subject
, object
, MAY_WRITE
, &ad
);
2498 rc
= smk_bu_note("IPv6 check", subject
, object
, MAY_WRITE
, rc
);
2501 #endif /* CONFIG_IPV6 */
2503 #ifdef SMACK_IPV6_PORT_LABELING
2505 * smk_ipv6_port_label - Smack port access table management
2509 * Create or update the port list entry
2511 static void smk_ipv6_port_label(struct socket
*sock
, struct sockaddr
*address
)
2513 struct sock
*sk
= sock
->sk
;
2514 struct sockaddr_in6
*addr6
;
2515 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2516 struct smk_port_label
*spp
;
2517 unsigned short port
= 0;
2519 if (address
== NULL
) {
2521 * This operation is changing the Smack information
2522 * on the bound socket. Take the changes to the port
2525 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2526 if (sk
!= spp
->smk_sock
)
2528 spp
->smk_in
= ssp
->smk_in
;
2529 spp
->smk_out
= ssp
->smk_out
;
2533 * A NULL address is only used for updating existing
2534 * bound entries. If there isn't one, it's OK.
2539 addr6
= (struct sockaddr_in6
*)address
;
2540 port
= ntohs(addr6
->sin6_port
);
2542 * This is a special case that is safely ignored.
2548 * Look for an existing port list entry.
2549 * This is an indication that a port is getting reused.
2551 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2552 if (spp
->smk_port
!= port
)
2554 spp
->smk_port
= port
;
2556 spp
->smk_in
= ssp
->smk_in
;
2557 spp
->smk_out
= ssp
->smk_out
;
2562 * A new port entry is required.
2564 spp
= kzalloc(sizeof(*spp
), GFP_KERNEL
);
2568 spp
->smk_port
= port
;
2570 spp
->smk_in
= ssp
->smk_in
;
2571 spp
->smk_out
= ssp
->smk_out
;
2573 list_add(&spp
->list
, &smk_ipv6_port_list
);
2578 * smk_ipv6_port_check - check Smack port access
2582 * Create or update the port list entry
2584 static int smk_ipv6_port_check(struct sock
*sk
, struct sockaddr_in6
*address
,
2587 struct smk_port_label
*spp
;
2588 struct socket_smack
*ssp
= sk
->sk_security
;
2589 struct smack_known
*skp
= NULL
;
2590 unsigned short port
;
2591 struct smack_known
*object
;
2593 if (act
== SMK_RECEIVING
) {
2594 skp
= smack_ipv6host_label(address
);
2595 object
= ssp
->smk_in
;
2598 object
= smack_ipv6host_label(address
);
2602 * The other end is a single label host.
2604 if (skp
!= NULL
&& object
!= NULL
)
2605 return smk_ipv6_check(skp
, object
, address
, act
);
2607 skp
= smack_net_ambient
;
2609 object
= smack_net_ambient
;
2612 * It's remote, so port lookup does no good.
2614 if (!smk_ipv6_localhost(address
))
2615 return smk_ipv6_check(skp
, object
, address
, act
);
2618 * It's local so the send check has to have passed.
2620 if (act
== SMK_RECEIVING
)
2623 port
= ntohs(address
->sin6_port
);
2624 list_for_each_entry(spp
, &smk_ipv6_port_list
, list
) {
2625 if (spp
->smk_port
!= port
)
2627 object
= spp
->smk_in
;
2628 if (act
== SMK_CONNECTING
)
2629 ssp
->smk_packet
= spp
->smk_out
;
2633 return smk_ipv6_check(skp
, object
, address
, act
);
2635 #endif /* SMACK_IPV6_PORT_LABELING */
2638 * smack_inode_setsecurity - set smack xattrs
2639 * @inode: the object
2640 * @name: attribute name
2641 * @value: attribute value
2642 * @size: size of the attribute
2645 * Sets the named attribute in the appropriate blob
2647 * Returns 0 on success, or an error code
2649 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
2650 const void *value
, size_t size
, int flags
)
2652 struct smack_known
*skp
;
2653 struct inode_smack
*nsp
= inode
->i_security
;
2654 struct socket_smack
*ssp
;
2655 struct socket
*sock
;
2658 if (value
== NULL
|| size
> SMK_LONGLABEL
|| size
== 0)
2661 skp
= smk_import_entry(value
, size
);
2663 return PTR_ERR(skp
);
2665 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
2666 nsp
->smk_inode
= skp
;
2667 nsp
->smk_flags
|= SMK_INODE_INSTANT
;
2671 * The rest of the Smack xattrs are only on sockets.
2673 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
2676 sock
= SOCKET_I(inode
);
2677 if (sock
== NULL
|| sock
->sk
== NULL
)
2680 ssp
= sock
->sk
->sk_security
;
2682 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
2684 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
2686 if (sock
->sk
->sk_family
== PF_INET
) {
2687 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2690 "Smack: \"%s\" netlbl error %d.\n",
2696 #ifdef SMACK_IPV6_PORT_LABELING
2697 if (sock
->sk
->sk_family
== PF_INET6
)
2698 smk_ipv6_port_label(sock
, NULL
);
2705 * smack_socket_post_create - finish socket setup
2707 * @family: protocol family
2712 * Sets the netlabel information on the socket
2714 * Returns 0 on success, and error code otherwise
2716 static int smack_socket_post_create(struct socket
*sock
, int family
,
2717 int type
, int protocol
, int kern
)
2719 struct socket_smack
*ssp
;
2721 if (sock
->sk
== NULL
)
2725 * Sockets created by kernel threads receive web label.
2727 if (unlikely(current
->flags
& PF_KTHREAD
)) {
2728 ssp
= sock
->sk
->sk_security
;
2729 ssp
->smk_in
= &smack_known_web
;
2730 ssp
->smk_out
= &smack_known_web
;
2733 if (family
!= PF_INET
)
2736 * Set the outbound netlbl.
2738 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2741 #ifdef SMACK_IPV6_PORT_LABELING
2743 * smack_socket_bind - record port binding information.
2745 * @address: the port address
2746 * @addrlen: size of the address
2748 * Records the label bound to a port.
2752 static int smack_socket_bind(struct socket
*sock
, struct sockaddr
*address
,
2755 if (sock
->sk
!= NULL
&& sock
->sk
->sk_family
== PF_INET6
)
2756 smk_ipv6_port_label(sock
, address
);
2759 #endif /* SMACK_IPV6_PORT_LABELING */
2762 * smack_socket_connect - connect access check
2764 * @sap: the other end
2765 * @addrlen: size of sap
2767 * Verifies that a connection may be possible
2769 * Returns 0 on success, and error code otherwise
2771 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
2775 #if IS_ENABLED(CONFIG_IPV6)
2776 struct sockaddr_in6
*sip
= (struct sockaddr_in6
*)sap
;
2778 #ifdef SMACK_IPV6_SECMARK_LABELING
2779 struct smack_known
*rsp
;
2780 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2783 if (sock
->sk
== NULL
)
2786 switch (sock
->sk
->sk_family
) {
2788 if (addrlen
< sizeof(struct sockaddr_in
))
2790 rc
= smack_netlabel_send(sock
->sk
, (struct sockaddr_in
*)sap
);
2793 if (addrlen
< sizeof(struct sockaddr_in6
))
2795 #ifdef SMACK_IPV6_SECMARK_LABELING
2796 rsp
= smack_ipv6host_label(sip
);
2798 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sip
,
2801 #ifdef SMACK_IPV6_PORT_LABELING
2802 rc
= smk_ipv6_port_check(sock
->sk
, sip
, SMK_CONNECTING
);
2810 * smack_flags_to_may - convert S_ to MAY_ values
2811 * @flags: the S_ value
2813 * Returns the equivalent MAY_ value
2815 static int smack_flags_to_may(int flags
)
2819 if (flags
& S_IRUGO
)
2821 if (flags
& S_IWUGO
)
2823 if (flags
& S_IXUGO
)
2830 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2835 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
2837 struct smack_known
*skp
= smk_of_current();
2839 msg
->security
= skp
;
2844 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2847 * Clears the blob pointer
2849 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
2851 msg
->security
= NULL
;
2855 * smack_of_shm - the smack pointer for the shm
2858 * Returns a pointer to the smack value
2860 static struct smack_known
*smack_of_shm(struct shmid_kernel
*shp
)
2862 return (struct smack_known
*)shp
->shm_perm
.security
;
2866 * smack_shm_alloc_security - Set the security blob for shm
2871 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
2873 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2874 struct smack_known
*skp
= smk_of_current();
2876 isp
->security
= skp
;
2881 * smack_shm_free_security - Clear the security blob for shm
2884 * Clears the blob pointer
2886 static void smack_shm_free_security(struct shmid_kernel
*shp
)
2888 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
2890 isp
->security
= NULL
;
2894 * smk_curacc_shm : check if current has access on shm
2896 * @access : access requested
2898 * Returns 0 if current has the requested access, error code otherwise
2900 static int smk_curacc_shm(struct shmid_kernel
*shp
, int access
)
2902 struct smack_known
*ssp
= smack_of_shm(shp
);
2903 struct smk_audit_info ad
;
2907 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
2908 ad
.a
.u
.ipc_id
= shp
->shm_perm
.id
;
2910 rc
= smk_curacc(ssp
, access
, &ad
);
2911 rc
= smk_bu_current("shm", ssp
, access
, rc
);
2916 * smack_shm_associate - Smack access check for shm
2918 * @shmflg: access requested
2920 * Returns 0 if current has the requested access, error code otherwise
2922 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
2926 may
= smack_flags_to_may(shmflg
);
2927 return smk_curacc_shm(shp
, may
);
2931 * smack_shm_shmctl - Smack access check for shm
2933 * @cmd: what it wants to do
2935 * Returns 0 if current has the requested access, error code otherwise
2937 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
2950 may
= MAY_READWRITE
;
2955 * System level information.
2961 return smk_curacc_shm(shp
, may
);
2965 * smack_shm_shmat - Smack access for shmat
2968 * @shmflg: access requested
2970 * Returns 0 if current has the requested access, error code otherwise
2972 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
2977 may
= smack_flags_to_may(shmflg
);
2978 return smk_curacc_shm(shp
, may
);
2982 * smack_of_sem - the smack pointer for the sem
2985 * Returns a pointer to the smack value
2987 static struct smack_known
*smack_of_sem(struct sem_array
*sma
)
2989 return (struct smack_known
*)sma
->sem_perm
.security
;
2993 * smack_sem_alloc_security - Set the security blob for sem
2998 static int smack_sem_alloc_security(struct sem_array
*sma
)
3000 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3001 struct smack_known
*skp
= smk_of_current();
3003 isp
->security
= skp
;
3008 * smack_sem_free_security - Clear the security blob for sem
3011 * Clears the blob pointer
3013 static void smack_sem_free_security(struct sem_array
*sma
)
3015 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
3017 isp
->security
= NULL
;
3021 * smk_curacc_sem : check if current has access on sem
3023 * @access : access requested
3025 * Returns 0 if current has the requested access, error code otherwise
3027 static int smk_curacc_sem(struct sem_array
*sma
, int access
)
3029 struct smack_known
*ssp
= smack_of_sem(sma
);
3030 struct smk_audit_info ad
;
3034 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3035 ad
.a
.u
.ipc_id
= sma
->sem_perm
.id
;
3037 rc
= smk_curacc(ssp
, access
, &ad
);
3038 rc
= smk_bu_current("sem", ssp
, access
, rc
);
3043 * smack_sem_associate - Smack access check for sem
3045 * @semflg: access requested
3047 * Returns 0 if current has the requested access, error code otherwise
3049 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
3053 may
= smack_flags_to_may(semflg
);
3054 return smk_curacc_sem(sma
, may
);
3058 * smack_sem_shmctl - Smack access check for sem
3060 * @cmd: what it wants to do
3062 * Returns 0 if current has the requested access, error code otherwise
3064 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
3082 may
= MAY_READWRITE
;
3087 * System level information
3094 return smk_curacc_sem(sma
, may
);
3098 * smack_sem_semop - Smack checks of semaphore operations
3104 * Treated as read and write in all cases.
3106 * Returns 0 if access is allowed, error code otherwise
3108 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
3109 unsigned nsops
, int alter
)
3111 return smk_curacc_sem(sma
, MAY_READWRITE
);
3115 * smack_msg_alloc_security - Set the security blob for msg
3120 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
3122 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3123 struct smack_known
*skp
= smk_of_current();
3125 kisp
->security
= skp
;
3130 * smack_msg_free_security - Clear the security blob for msg
3133 * Clears the blob pointer
3135 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
3137 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
3139 kisp
->security
= NULL
;
3143 * smack_of_msq - the smack pointer for the msq
3146 * Returns a pointer to the smack label entry
3148 static struct smack_known
*smack_of_msq(struct msg_queue
*msq
)
3150 return (struct smack_known
*)msq
->q_perm
.security
;
3154 * smk_curacc_msq : helper to check if current has access on msq
3156 * @access : access requested
3158 * return 0 if current has access, error otherwise
3160 static int smk_curacc_msq(struct msg_queue
*msq
, int access
)
3162 struct smack_known
*msp
= smack_of_msq(msq
);
3163 struct smk_audit_info ad
;
3167 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3168 ad
.a
.u
.ipc_id
= msq
->q_perm
.id
;
3170 rc
= smk_curacc(msp
, access
, &ad
);
3171 rc
= smk_bu_current("msq", msp
, access
, rc
);
3176 * smack_msg_queue_associate - Smack access check for msg_queue
3178 * @msqflg: access requested
3180 * Returns 0 if current has the requested access, error code otherwise
3182 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
3186 may
= smack_flags_to_may(msqflg
);
3187 return smk_curacc_msq(msq
, may
);
3191 * smack_msg_queue_msgctl - Smack access check for msg_queue
3193 * @cmd: what it wants to do
3195 * Returns 0 if current has the requested access, error code otherwise
3197 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
3208 may
= MAY_READWRITE
;
3213 * System level information
3220 return smk_curacc_msq(msq
, may
);
3224 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3227 * @msqflg: access requested
3229 * Returns 0 if current has the requested access, error code otherwise
3231 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
3236 may
= smack_flags_to_may(msqflg
);
3237 return smk_curacc_msq(msq
, may
);
3241 * smack_msg_queue_msgsnd - Smack access check for msg_queue
3248 * Returns 0 if current has read and write access, error code otherwise
3250 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
3251 struct task_struct
*target
, long type
, int mode
)
3253 return smk_curacc_msq(msq
, MAY_READWRITE
);
3257 * smack_ipc_permission - Smack access for ipc_permission()
3258 * @ipp: the object permissions
3259 * @flag: access requested
3261 * Returns 0 if current has read and write access, error code otherwise
3263 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
3265 struct smack_known
*iskp
= ipp
->security
;
3266 int may
= smack_flags_to_may(flag
);
3267 struct smk_audit_info ad
;
3271 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_IPC
);
3272 ad
.a
.u
.ipc_id
= ipp
->id
;
3274 rc
= smk_curacc(iskp
, may
, &ad
);
3275 rc
= smk_bu_current("svipc", iskp
, may
, rc
);
3280 * smack_ipc_getsecid - Extract smack security id
3281 * @ipp: the object permissions
3282 * @secid: where result will be saved
3284 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
3286 struct smack_known
*iskp
= ipp
->security
;
3288 *secid
= iskp
->smk_secid
;
3292 * smack_d_instantiate - Make sure the blob is correct on an inode
3293 * @opt_dentry: dentry where inode will be attached
3294 * @inode: the object
3296 * Set the inode's security blob if it hasn't been done already.
3298 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
3300 struct super_block
*sbp
;
3301 struct superblock_smack
*sbsp
;
3302 struct inode_smack
*isp
;
3303 struct smack_known
*skp
;
3304 struct smack_known
*ckp
= smk_of_current();
3305 struct smack_known
*final
;
3306 char trattr
[TRANS_TRUE_SIZE
];
3314 isp
= inode
->i_security
;
3316 mutex_lock(&isp
->smk_lock
);
3318 * If the inode is already instantiated
3319 * take the quick way out
3321 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
3325 sbsp
= sbp
->s_security
;
3327 * We're going to use the superblock default label
3328 * if there's no label on the file.
3330 final
= sbsp
->smk_default
;
3333 * If this is the root inode the superblock
3334 * may be in the process of initialization.
3335 * If that is the case use the root value out
3336 * of the superblock.
3338 if (opt_dentry
->d_parent
== opt_dentry
) {
3339 switch (sbp
->s_magic
) {
3340 case CGROUP_SUPER_MAGIC
:
3342 * The cgroup filesystem is never mounted,
3343 * so there's no opportunity to set the mount
3346 sbsp
->smk_root
= &smack_known_star
;
3347 sbsp
->smk_default
= &smack_known_star
;
3348 isp
->smk_inode
= sbsp
->smk_root
;
3352 * What about shmem/tmpfs anonymous files with dentry
3353 * obtained from d_alloc_pseudo()?
3355 isp
->smk_inode
= smk_of_current();
3358 isp
->smk_inode
= sbsp
->smk_root
;
3361 isp
->smk_flags
|= SMK_INODE_INSTANT
;
3366 * This is pretty hackish.
3367 * Casey says that we shouldn't have to do
3368 * file system specific code, but it does help
3369 * with keeping it simple.
3371 switch (sbp
->s_magic
) {
3375 case CGROUP_SUPER_MAGIC
:
3377 * Casey says that it's a little embarrassing
3378 * that the smack file system doesn't do
3379 * extended attributes.
3381 * Casey says pipes are easy (?)
3383 * Socket access is controlled by the socket
3384 * structures associated with the task involved.
3386 * Cgroupfs is special
3388 final
= &smack_known_star
;
3390 case DEVPTS_SUPER_MAGIC
:
3392 * devpts seems content with the label of the task.
3393 * Programs that change smack have to treat the
3398 case PROC_SUPER_MAGIC
:
3400 * Casey says procfs appears not to care.
3401 * The superblock default suffices.
3406 * Device labels should come from the filesystem,
3407 * but watch out, because they're volitile,
3408 * getting recreated on every reboot.
3410 final
= &smack_known_star
;
3414 * If a smack value has been set we want to use it,
3415 * but since tmpfs isn't giving us the opportunity
3416 * to set mount options simulate setting the
3417 * superblock default.
3421 * This isn't an understood special case.
3422 * Get the value from the xattr.
3426 * UNIX domain sockets use lower level socket data.
3428 if (S_ISSOCK(inode
->i_mode
)) {
3429 final
= &smack_known_star
;
3433 * No xattr support means, alas, no SMACK label.
3434 * Use the aforeapplied default.
3435 * It would be curious if the label of the task
3436 * does not match that assigned.
3438 if (inode
->i_op
->getxattr
== NULL
)
3441 * Get the dentry for xattr.
3443 dp
= dget(opt_dentry
);
3444 skp
= smk_fetch(XATTR_NAME_SMACK
, inode
, dp
);
3445 if (!IS_ERR_OR_NULL(skp
))
3449 * Transmuting directory
3451 if (S_ISDIR(inode
->i_mode
)) {
3453 * If this is a new directory and the label was
3454 * transmuted when the inode was initialized
3455 * set the transmute attribute on the directory
3456 * and mark the inode.
3458 * If there is a transmute attribute on the
3459 * directory mark the inode.
3461 if (isp
->smk_flags
& SMK_INODE_CHANGED
) {
3462 isp
->smk_flags
&= ~SMK_INODE_CHANGED
;
3463 rc
= inode
->i_op
->setxattr(dp
,
3464 XATTR_NAME_SMACKTRANSMUTE
,
3465 TRANS_TRUE
, TRANS_TRUE_SIZE
,
3468 rc
= inode
->i_op
->getxattr(dp
,
3469 XATTR_NAME_SMACKTRANSMUTE
, trattr
,
3471 if (rc
>= 0 && strncmp(trattr
, TRANS_TRUE
,
3472 TRANS_TRUE_SIZE
) != 0)
3476 transflag
= SMK_INODE_TRANSMUTE
;
3479 * Don't let the exec or mmap label be "*" or "@".
3481 skp
= smk_fetch(XATTR_NAME_SMACKEXEC
, inode
, dp
);
3482 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3483 skp
== &smack_known_web
)
3485 isp
->smk_task
= skp
;
3487 skp
= smk_fetch(XATTR_NAME_SMACKMMAP
, inode
, dp
);
3488 if (IS_ERR(skp
) || skp
== &smack_known_star
||
3489 skp
== &smack_known_web
)
3491 isp
->smk_mmap
= skp
;
3498 isp
->smk_inode
= ckp
;
3500 isp
->smk_inode
= final
;
3502 isp
->smk_flags
|= (SMK_INODE_INSTANT
| transflag
);
3505 mutex_unlock(&isp
->smk_lock
);
3510 * smack_getprocattr - Smack process attribute access
3511 * @p: the object task
3512 * @name: the name of the attribute in /proc/.../attr
3513 * @value: where to put the result
3515 * Places a copy of the task Smack into value
3517 * Returns the length of the smack label or an error code
3519 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
3521 struct smack_known
*skp
= smk_of_task_struct(p
);
3525 if (strcmp(name
, "current") != 0)
3528 cp
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
3538 * smack_setprocattr - Smack process attribute setting
3539 * @p: the object task
3540 * @name: the name of the attribute in /proc/.../attr
3541 * @value: the value to set
3542 * @size: the size of the value
3544 * Sets the Smack value of the task. Only setting self
3545 * is permitted and only with privilege
3547 * Returns the length of the smack label or an error code
3549 static int smack_setprocattr(struct task_struct
*p
, char *name
,
3550 void *value
, size_t size
)
3552 struct task_smack
*tsp
;
3554 struct smack_known
*skp
;
3557 * Changing another process' Smack value is too dangerous
3558 * and supports no sane use case.
3563 if (!smack_privileged(CAP_MAC_ADMIN
))
3566 if (value
== NULL
|| size
== 0 || size
>= SMK_LONGLABEL
)
3569 if (strcmp(name
, "current") != 0)
3572 skp
= smk_import_entry(value
, size
);
3574 return PTR_ERR(skp
);
3577 * No process is ever allowed the web ("@") label.
3579 if (skp
== &smack_known_web
)
3582 new = prepare_creds();
3586 tsp
= new->security
;
3587 tsp
->smk_task
= skp
;
3594 * smack_unix_stream_connect - Smack access on UDS
3596 * @other: the other sock
3599 * Return 0 if a subject with the smack of sock could access
3600 * an object with the smack of other, otherwise an error code
3602 static int smack_unix_stream_connect(struct sock
*sock
,
3603 struct sock
*other
, struct sock
*newsk
)
3605 struct smack_known
*skp
;
3606 struct smack_known
*okp
;
3607 struct socket_smack
*ssp
= sock
->sk_security
;
3608 struct socket_smack
*osp
= other
->sk_security
;
3609 struct socket_smack
*nsp
= newsk
->sk_security
;
3610 struct smk_audit_info ad
;
3613 struct lsm_network_audit net
;
3616 if (!smack_privileged(CAP_MAC_OVERRIDE
)) {
3620 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3621 smk_ad_setfield_u_net_sk(&ad
, other
);
3623 rc
= smk_access(skp
, okp
, MAY_WRITE
, &ad
);
3624 rc
= smk_bu_note("UDS connect", skp
, okp
, MAY_WRITE
, rc
);
3628 rc
= smk_access(okp
, skp
, MAY_WRITE
, &ad
);
3629 rc
= smk_bu_note("UDS connect", okp
, skp
,
3635 * Cross reference the peer labels for SO_PEERSEC.
3638 nsp
->smk_packet
= ssp
->smk_out
;
3639 ssp
->smk_packet
= osp
->smk_out
;
3646 * smack_unix_may_send - Smack access on UDS
3648 * @other: the other socket
3650 * Return 0 if a subject with the smack of sock could access
3651 * an object with the smack of other, otherwise an error code
3653 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
3655 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3656 struct socket_smack
*osp
= other
->sk
->sk_security
;
3657 struct smk_audit_info ad
;
3661 struct lsm_network_audit net
;
3663 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3664 smk_ad_setfield_u_net_sk(&ad
, other
->sk
);
3667 if (smack_privileged(CAP_MAC_OVERRIDE
))
3670 rc
= smk_access(ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, &ad
);
3671 rc
= smk_bu_note("UDS send", ssp
->smk_out
, osp
->smk_in
, MAY_WRITE
, rc
);
3676 * smack_socket_sendmsg - Smack check based on destination host
3679 * @size: the size of the message
3681 * Return 0 if the current subject can write to the destination host.
3682 * For IPv4 this is only a question if the destination is a single label host.
3683 * For IPv6 this is a check against the label of the port.
3685 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
3688 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
3689 #if IS_ENABLED(CONFIG_IPV6)
3690 struct sockaddr_in6
*sap
= (struct sockaddr_in6
*) msg
->msg_name
;
3692 #ifdef SMACK_IPV6_SECMARK_LABELING
3693 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
3694 struct smack_known
*rsp
;
3699 * Perfectly reasonable for this to be NULL
3704 switch (sip
->sin_family
) {
3706 rc
= smack_netlabel_send(sock
->sk
, sip
);
3709 #ifdef SMACK_IPV6_SECMARK_LABELING
3710 rsp
= smack_ipv6host_label(sap
);
3712 rc
= smk_ipv6_check(ssp
->smk_out
, rsp
, sap
,
3715 #ifdef SMACK_IPV6_PORT_LABELING
3716 rc
= smk_ipv6_port_check(sock
->sk
, sap
, SMK_SENDING
);
3724 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3725 * @sap: netlabel secattr
3726 * @ssp: socket security information
3728 * Returns a pointer to a Smack label entry found on the label list.
3730 static struct smack_known
*smack_from_secattr(struct netlbl_lsm_secattr
*sap
,
3731 struct socket_smack
*ssp
)
3733 struct smack_known
*skp
;
3738 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
3740 * Looks like a CIPSO packet.
3741 * If there are flags but no level netlabel isn't
3742 * behaving the way we expect it to.
3744 * Look it up in the label table
3745 * Without guidance regarding the smack value
3746 * for the packet fall back on the network
3750 list_for_each_entry(skp
, &smack_known_list
, list
) {
3751 if (sap
->attr
.mls
.lvl
!= skp
->smk_netlabel
.attr
.mls
.lvl
)
3754 * Compare the catsets. Use the netlbl APIs.
3756 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) == 0) {
3757 if ((skp
->smk_netlabel
.flags
&
3758 NETLBL_SECATTR_MLS_CAT
) == 0)
3762 for (acat
= -1, kcat
= -1; acat
== kcat
; ) {
3763 acat
= netlbl_catmap_walk(sap
->attr
.mls
.cat
,
3765 kcat
= netlbl_catmap_walk(
3766 skp
->smk_netlabel
.attr
.mls
.cat
,
3768 if (acat
< 0 || kcat
< 0)
3781 if (ssp
!= NULL
&& ssp
->smk_in
== &smack_known_star
)
3782 return &smack_known_web
;
3783 return &smack_known_star
;
3785 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
3787 * Looks like a fallback, which gives us a secid.
3789 skp
= smack_from_secid(sap
->attr
.secid
);
3791 * This has got to be a bug because it is
3792 * impossible to specify a fallback without
3793 * specifying the label, which will ensure
3794 * it has a secid, and the only way to get a
3795 * secid is from a fallback.
3797 BUG_ON(skp
== NULL
);
3801 * Without guidance regarding the smack value
3802 * for the packet fall back on the network
3805 return smack_net_ambient
;
3808 #if IS_ENABLED(CONFIG_IPV6)
3809 static int smk_skb_to_addr_ipv6(struct sk_buff
*skb
, struct sockaddr_in6
*sip
)
3813 int proto
= -EINVAL
;
3814 struct ipv6hdr _ipv6h
;
3815 struct ipv6hdr
*ip6
;
3817 struct tcphdr _tcph
, *th
;
3818 struct udphdr _udph
, *uh
;
3819 struct dccp_hdr _dccph
, *dh
;
3823 offset
= skb_network_offset(skb
);
3824 ip6
= skb_header_pointer(skb
, offset
, sizeof(_ipv6h
), &_ipv6h
);
3827 sip
->sin6_addr
= ip6
->saddr
;
3829 nexthdr
= ip6
->nexthdr
;
3830 offset
+= sizeof(_ipv6h
);
3831 offset
= ipv6_skip_exthdr(skb
, offset
, &nexthdr
, &frag_off
);
3838 th
= skb_header_pointer(skb
, offset
, sizeof(_tcph
), &_tcph
);
3840 sip
->sin6_port
= th
->source
;
3843 uh
= skb_header_pointer(skb
, offset
, sizeof(_udph
), &_udph
);
3845 sip
->sin6_port
= uh
->source
;
3848 dh
= skb_header_pointer(skb
, offset
, sizeof(_dccph
), &_dccph
);
3850 sip
->sin6_port
= dh
->dccph_sport
;
3855 #endif /* CONFIG_IPV6 */
3858 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3862 * Returns 0 if the packet should be delivered, an error code otherwise
3864 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
3866 struct netlbl_lsm_secattr secattr
;
3867 struct socket_smack
*ssp
= sk
->sk_security
;
3868 struct smack_known
*skp
= NULL
;
3870 struct smk_audit_info ad
;
3872 struct lsm_network_audit net
;
3874 #if IS_ENABLED(CONFIG_IPV6)
3875 struct sockaddr_in6 sadd
;
3877 #endif /* CONFIG_IPV6 */
3879 switch (sk
->sk_family
) {
3881 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3883 * If there is a secmark use it rather than the CIPSO label.
3884 * If there is no secmark fall back to CIPSO.
3885 * The secmark is assumed to reflect policy better.
3887 if (skb
&& skb
->secmark
!= 0) {
3888 skp
= smack_from_secid(skb
->secmark
);
3891 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
3893 * Translate what netlabel gave us.
3895 netlbl_secattr_init(&secattr
);
3897 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
3899 skp
= smack_from_secattr(&secattr
, ssp
);
3901 skp
= smack_net_ambient
;
3903 netlbl_secattr_destroy(&secattr
);
3905 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
3909 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3910 ad
.a
.u
.net
->family
= sk
->sk_family
;
3911 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3912 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3915 * Receiving a packet requires that the other end
3916 * be able to write here. Read access is not required.
3917 * This is the simplist possible security model
3920 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3921 rc
= smk_bu_note("IPv4 delivery", skp
, ssp
->smk_in
,
3924 netlbl_skbuff_err(skb
, rc
, 0);
3926 #if IS_ENABLED(CONFIG_IPV6)
3928 proto
= smk_skb_to_addr_ipv6(skb
, &sadd
);
3929 if (proto
!= IPPROTO_UDP
&& proto
!= IPPROTO_TCP
)
3931 #ifdef SMACK_IPV6_SECMARK_LABELING
3932 if (skb
&& skb
->secmark
!= 0)
3933 skp
= smack_from_secid(skb
->secmark
);
3935 skp
= smack_ipv6host_label(&sadd
);
3937 skp
= smack_net_ambient
;
3939 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
3940 ad
.a
.u
.net
->family
= sk
->sk_family
;
3941 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
3942 ipv6_skb_to_auditdata(skb
, &ad
.a
, NULL
);
3943 #endif /* CONFIG_AUDIT */
3944 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
3945 rc
= smk_bu_note("IPv6 delivery", skp
, ssp
->smk_in
,
3947 #endif /* SMACK_IPV6_SECMARK_LABELING */
3948 #ifdef SMACK_IPV6_PORT_LABELING
3949 rc
= smk_ipv6_port_check(sk
, &sadd
, SMK_RECEIVING
);
3950 #endif /* SMACK_IPV6_PORT_LABELING */
3952 #endif /* CONFIG_IPV6 */
3959 * smack_socket_getpeersec_stream - pull in packet label
3961 * @optval: user's destination
3962 * @optlen: size thereof
3965 * returns zero on success, an error code otherwise
3967 static int smack_socket_getpeersec_stream(struct socket
*sock
,
3968 char __user
*optval
,
3969 int __user
*optlen
, unsigned len
)
3971 struct socket_smack
*ssp
;
3976 ssp
= sock
->sk
->sk_security
;
3977 if (ssp
->smk_packet
!= NULL
) {
3978 rcp
= ssp
->smk_packet
->smk_known
;
3979 slen
= strlen(rcp
) + 1;
3984 else if (copy_to_user(optval
, rcp
, slen
) != 0)
3987 if (put_user(slen
, optlen
) != 0)
3995 * smack_socket_getpeersec_dgram - pull in packet label
3996 * @sock: the peer socket
3998 * @secid: pointer to where to put the secid of the packet
4000 * Sets the netlabel socket state on sk from parent
4002 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
4003 struct sk_buff
*skb
, u32
*secid
)
4006 struct netlbl_lsm_secattr secattr
;
4007 struct socket_smack
*ssp
= NULL
;
4008 struct smack_known
*skp
;
4009 int family
= PF_UNSPEC
;
4010 u32 s
= 0; /* 0 is the invalid secid */
4014 if (skb
->protocol
== htons(ETH_P_IP
))
4016 #if IS_ENABLED(CONFIG_IPV6)
4017 else if (skb
->protocol
== htons(ETH_P_IPV6
))
4019 #endif /* CONFIG_IPV6 */
4021 if (family
== PF_UNSPEC
&& sock
!= NULL
)
4022 family
= sock
->sk
->sk_family
;
4026 ssp
= sock
->sk
->sk_security
;
4027 s
= ssp
->smk_out
->smk_secid
;
4030 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4036 * Translate what netlabel gave us.
4038 if (sock
!= NULL
&& sock
->sk
!= NULL
)
4039 ssp
= sock
->sk
->sk_security
;
4040 netlbl_secattr_init(&secattr
);
4041 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4043 skp
= smack_from_secattr(&secattr
, ssp
);
4046 netlbl_secattr_destroy(&secattr
);
4049 #ifdef SMACK_IPV6_SECMARK_LABELING
4061 * smack_sock_graft - Initialize a newly created socket with an existing sock
4063 * @parent: parent socket
4065 * Set the smk_{in,out} state of an existing sock based on the process that
4066 * is creating the new socket.
4068 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
4070 struct socket_smack
*ssp
;
4071 struct smack_known
*skp
= smk_of_current();
4074 (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
))
4077 ssp
= sk
->sk_security
;
4080 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
4084 * smack_inet_conn_request - Smack access check on connect
4085 * @sk: socket involved
4089 * Returns 0 if a task with the packet label could write to
4090 * the socket, otherwise an error code
4092 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
4093 struct request_sock
*req
)
4095 u16 family
= sk
->sk_family
;
4096 struct smack_known
*skp
;
4097 struct socket_smack
*ssp
= sk
->sk_security
;
4098 struct netlbl_lsm_secattr secattr
;
4099 struct sockaddr_in addr
;
4101 struct smack_known
*hskp
;
4103 struct smk_audit_info ad
;
4105 struct lsm_network_audit net
;
4108 #if IS_ENABLED(CONFIG_IPV6)
4109 if (family
== PF_INET6
) {
4111 * Handle mapped IPv4 packets arriving
4112 * via IPv6 sockets. Don't set up netlabel
4113 * processing on IPv6.
4115 if (skb
->protocol
== htons(ETH_P_IP
))
4120 #endif /* CONFIG_IPV6 */
4122 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4124 * If there is a secmark use it rather than the CIPSO label.
4125 * If there is no secmark fall back to CIPSO.
4126 * The secmark is assumed to reflect policy better.
4128 if (skb
&& skb
->secmark
!= 0) {
4129 skp
= smack_from_secid(skb
->secmark
);
4132 #endif /* CONFIG_SECURITY_SMACK_NETFILTER */
4134 netlbl_secattr_init(&secattr
);
4135 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
4137 skp
= smack_from_secattr(&secattr
, ssp
);
4139 skp
= &smack_known_huh
;
4140 netlbl_secattr_destroy(&secattr
);
4142 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4147 smk_ad_init_net(&ad
, __func__
, LSM_AUDIT_DATA_NET
, &net
);
4148 ad
.a
.u
.net
->family
= family
;
4149 ad
.a
.u
.net
->netif
= skb
->skb_iif
;
4150 ipv4_skb_to_auditdata(skb
, &ad
.a
, NULL
);
4153 * Receiving a packet requires that the other end be able to write
4154 * here. Read access is not required.
4156 rc
= smk_access(skp
, ssp
->smk_in
, MAY_WRITE
, &ad
);
4157 rc
= smk_bu_note("IPv4 connect", skp
, ssp
->smk_in
, MAY_WRITE
, rc
);
4162 * Save the peer's label in the request_sock so we can later setup
4163 * smk_packet in the child socket so that SO_PEERCRED can report it.
4165 req
->peer_secid
= skp
->smk_secid
;
4168 * We need to decide if we want to label the incoming connection here
4169 * if we do we only need to label the request_sock and the stack will
4170 * propagate the wire-label to the sock when it is created.
4173 addr
.sin_addr
.s_addr
= hdr
->saddr
;
4175 hskp
= smack_ipv4host_label(&addr
);
4179 rc
= netlbl_req_setattr(req
, &skp
->smk_netlabel
);
4181 netlbl_req_delattr(req
);
4187 * smack_inet_csk_clone - Copy the connection information to the new socket
4188 * @sk: the new socket
4189 * @req: the connection's request_sock
4191 * Transfer the connection's peer label to the newly created socket.
4193 static void smack_inet_csk_clone(struct sock
*sk
,
4194 const struct request_sock
*req
)
4196 struct socket_smack
*ssp
= sk
->sk_security
;
4197 struct smack_known
*skp
;
4199 if (req
->peer_secid
!= 0) {
4200 skp
= smack_from_secid(req
->peer_secid
);
4201 ssp
->smk_packet
= skp
;
4203 ssp
->smk_packet
= NULL
;
4207 * Key management security hooks
4209 * Casey has not tested key support very heavily.
4210 * The permission check is most likely too restrictive.
4211 * If you care about keys please have a look.
4216 * smack_key_alloc - Set the key security blob
4218 * @cred: the credentials to use
4221 * No allocation required
4225 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
4226 unsigned long flags
)
4228 struct smack_known
*skp
= smk_of_task(cred
->security
);
4230 key
->security
= skp
;
4235 * smack_key_free - Clear the key security blob
4238 * Clear the blob pointer
4240 static void smack_key_free(struct key
*key
)
4242 key
->security
= NULL
;
4246 * smack_key_permission - Smack access on a key
4247 * @key_ref: gets to the object
4248 * @cred: the credentials to use
4249 * @perm: requested key permissions
4251 * Return 0 if the task has read and write to the object,
4252 * an error code otherwise
4254 static int smack_key_permission(key_ref_t key_ref
,
4255 const struct cred
*cred
, unsigned perm
)
4258 struct smk_audit_info ad
;
4259 struct smack_known
*tkp
= smk_of_task(cred
->security
);
4263 keyp
= key_ref_to_ptr(key_ref
);
4267 * If the key hasn't been initialized give it access so that
4270 if (keyp
->security
== NULL
)
4273 * This should not occur
4278 smk_ad_init(&ad
, __func__
, LSM_AUDIT_DATA_KEY
);
4279 ad
.a
.u
.key_struct
.key
= keyp
->serial
;
4280 ad
.a
.u
.key_struct
.key_desc
= keyp
->description
;
4282 if (perm
& KEY_NEED_READ
)
4284 if (perm
& (KEY_NEED_WRITE
| KEY_NEED_LINK
| KEY_NEED_SETATTR
))
4285 request
= MAY_WRITE
;
4286 rc
= smk_access(tkp
, keyp
->security
, request
, &ad
);
4287 rc
= smk_bu_note("key access", tkp
, keyp
->security
, request
, rc
);
4292 * smack_key_getsecurity - Smack label tagging the key
4293 * @key points to the key to be queried
4294 * @_buffer points to a pointer that should be set to point to the
4295 * resulting string (if no label or an error occurs).
4296 * Return the length of the string (including terminating NUL) or -ve if
4298 * May also return 0 (and a NULL buffer pointer) if there is no label.
4300 static int smack_key_getsecurity(struct key
*key
, char **_buffer
)
4302 struct smack_known
*skp
= key
->security
;
4306 if (key
->security
== NULL
) {
4311 copy
= kstrdup(skp
->smk_known
, GFP_KERNEL
);
4314 length
= strlen(copy
) + 1;
4320 #endif /* CONFIG_KEYS */
4325 * Audit requires a unique representation of each Smack specific
4326 * rule. This unique representation is used to distinguish the
4327 * object to be audited from remaining kernel objects and also
4328 * works as a glue between the audit hooks.
4330 * Since repository entries are added but never deleted, we'll use
4331 * the smack_known label address related to the given audit rule as
4332 * the needed unique representation. This also better fits the smack
4333 * model where nearly everything is a label.
4338 * smack_audit_rule_init - Initialize a smack audit rule
4339 * @field: audit rule fields given from user-space (audit.h)
4340 * @op: required testing operator (=, !=, >, <, ...)
4341 * @rulestr: smack label to be audited
4342 * @vrule: pointer to save our own audit rule representation
4344 * Prepare to audit cases where (@field @op @rulestr) is true.
4345 * The label to be audited is created if necessay.
4347 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
4349 struct smack_known
*skp
;
4350 char **rule
= (char **)vrule
;
4353 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4356 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
4359 skp
= smk_import_entry(rulestr
, 0);
4361 return PTR_ERR(skp
);
4363 *rule
= skp
->smk_known
;
4369 * smack_audit_rule_known - Distinguish Smack audit rules
4370 * @krule: rule of interest, in Audit kernel representation format
4372 * This is used to filter Smack rules from remaining Audit ones.
4373 * If it's proved that this rule belongs to us, the
4374 * audit_rule_match hook will be called to do the final judgement.
4376 static int smack_audit_rule_known(struct audit_krule
*krule
)
4378 struct audit_field
*f
;
4381 for (i
= 0; i
< krule
->field_count
; i
++) {
4382 f
= &krule
->fields
[i
];
4384 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
4392 * smack_audit_rule_match - Audit given object ?
4393 * @secid: security id for identifying the object to test
4394 * @field: audit rule flags given from user-space
4395 * @op: required testing operator
4396 * @vrule: smack internal rule presentation
4397 * @actx: audit context associated with the check
4399 * The core Audit hook. It's used to take the decision of
4400 * whether to audit or not to audit a given object.
4402 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
4403 struct audit_context
*actx
)
4405 struct smack_known
*skp
;
4408 if (unlikely(!rule
)) {
4409 WARN_ONCE(1, "Smack: missing rule\n");
4413 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
4416 skp
= smack_from_secid(secid
);
4419 * No need to do string comparisons. If a match occurs,
4420 * both pointers will point to the same smack_known
4423 if (op
== Audit_equal
)
4424 return (rule
== skp
->smk_known
);
4425 if (op
== Audit_not_equal
)
4426 return (rule
!= skp
->smk_known
);
4432 * smack_audit_rule_free - free smack rule representation
4433 * @vrule: rule to be freed.
4435 * No memory was allocated.
4437 static void smack_audit_rule_free(void *vrule
)
4442 #endif /* CONFIG_AUDIT */
4445 * smack_ismaclabel - check if xattr @name references a smack MAC label
4446 * @name: Full xattr name to check.
4448 static int smack_ismaclabel(const char *name
)
4450 return (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0);
4455 * smack_secid_to_secctx - return the smack label for a secid
4456 * @secid: incoming integer
4457 * @secdata: destination
4458 * @seclen: how long it is
4460 * Exists for networking code.
4462 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
4464 struct smack_known
*skp
= smack_from_secid(secid
);
4467 *secdata
= skp
->smk_known
;
4468 *seclen
= strlen(skp
->smk_known
);
4473 * smack_secctx_to_secid - return the secid for a smack label
4474 * @secdata: smack label
4475 * @seclen: how long result is
4476 * @secid: outgoing integer
4478 * Exists for audit and networking code.
4480 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
4482 struct smack_known
*skp
= smk_find_entry(secdata
);
4485 *secid
= skp
->smk_secid
;
4492 * smack_release_secctx - don't do anything.
4496 * Exists to make sure nothing gets done, and properly
4498 static void smack_release_secctx(char *secdata
, u32 seclen
)
4502 static int smack_inode_notifysecctx(struct inode
*inode
, void *ctx
, u32 ctxlen
)
4504 return smack_inode_setsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, ctxlen
, 0);
4507 static int smack_inode_setsecctx(struct dentry
*dentry
, void *ctx
, u32 ctxlen
)
4509 return __vfs_setxattr_noperm(dentry
, XATTR_NAME_SMACK
, ctx
, ctxlen
, 0);
4512 static int smack_inode_getsecctx(struct inode
*inode
, void **ctx
, u32
*ctxlen
)
4515 len
= smack_inode_getsecurity(inode
, XATTR_SMACK_SUFFIX
, ctx
, true);
4523 static struct security_hook_list smack_hooks
[] = {
4524 LSM_HOOK_INIT(ptrace_access_check
, smack_ptrace_access_check
),
4525 LSM_HOOK_INIT(ptrace_traceme
, smack_ptrace_traceme
),
4526 LSM_HOOK_INIT(syslog
, smack_syslog
),
4528 LSM_HOOK_INIT(sb_alloc_security
, smack_sb_alloc_security
),
4529 LSM_HOOK_INIT(sb_free_security
, smack_sb_free_security
),
4530 LSM_HOOK_INIT(sb_copy_data
, smack_sb_copy_data
),
4531 LSM_HOOK_INIT(sb_kern_mount
, smack_sb_kern_mount
),
4532 LSM_HOOK_INIT(sb_statfs
, smack_sb_statfs
),
4533 LSM_HOOK_INIT(sb_set_mnt_opts
, smack_set_mnt_opts
),
4534 LSM_HOOK_INIT(sb_parse_opts_str
, smack_parse_opts_str
),
4536 LSM_HOOK_INIT(bprm_set_creds
, smack_bprm_set_creds
),
4537 LSM_HOOK_INIT(bprm_committing_creds
, smack_bprm_committing_creds
),
4538 LSM_HOOK_INIT(bprm_secureexec
, smack_bprm_secureexec
),
4540 LSM_HOOK_INIT(inode_alloc_security
, smack_inode_alloc_security
),
4541 LSM_HOOK_INIT(inode_free_security
, smack_inode_free_security
),
4542 LSM_HOOK_INIT(inode_init_security
, smack_inode_init_security
),
4543 LSM_HOOK_INIT(inode_link
, smack_inode_link
),
4544 LSM_HOOK_INIT(inode_unlink
, smack_inode_unlink
),
4545 LSM_HOOK_INIT(inode_rmdir
, smack_inode_rmdir
),
4546 LSM_HOOK_INIT(inode_rename
, smack_inode_rename
),
4547 LSM_HOOK_INIT(inode_permission
, smack_inode_permission
),
4548 LSM_HOOK_INIT(inode_setattr
, smack_inode_setattr
),
4549 LSM_HOOK_INIT(inode_getattr
, smack_inode_getattr
),
4550 LSM_HOOK_INIT(inode_setxattr
, smack_inode_setxattr
),
4551 LSM_HOOK_INIT(inode_post_setxattr
, smack_inode_post_setxattr
),
4552 LSM_HOOK_INIT(inode_getxattr
, smack_inode_getxattr
),
4553 LSM_HOOK_INIT(inode_removexattr
, smack_inode_removexattr
),
4554 LSM_HOOK_INIT(inode_getsecurity
, smack_inode_getsecurity
),
4555 LSM_HOOK_INIT(inode_setsecurity
, smack_inode_setsecurity
),
4556 LSM_HOOK_INIT(inode_listsecurity
, smack_inode_listsecurity
),
4557 LSM_HOOK_INIT(inode_getsecid
, smack_inode_getsecid
),
4559 LSM_HOOK_INIT(file_permission
, smack_file_permission
),
4560 LSM_HOOK_INIT(file_alloc_security
, smack_file_alloc_security
),
4561 LSM_HOOK_INIT(file_free_security
, smack_file_free_security
),
4562 LSM_HOOK_INIT(file_ioctl
, smack_file_ioctl
),
4563 LSM_HOOK_INIT(file_lock
, smack_file_lock
),
4564 LSM_HOOK_INIT(file_fcntl
, smack_file_fcntl
),
4565 LSM_HOOK_INIT(mmap_file
, smack_mmap_file
),
4566 LSM_HOOK_INIT(mmap_addr
, cap_mmap_addr
),
4567 LSM_HOOK_INIT(file_set_fowner
, smack_file_set_fowner
),
4568 LSM_HOOK_INIT(file_send_sigiotask
, smack_file_send_sigiotask
),
4569 LSM_HOOK_INIT(file_receive
, smack_file_receive
),
4571 LSM_HOOK_INIT(file_open
, smack_file_open
),
4573 LSM_HOOK_INIT(cred_alloc_blank
, smack_cred_alloc_blank
),
4574 LSM_HOOK_INIT(cred_free
, smack_cred_free
),
4575 LSM_HOOK_INIT(cred_prepare
, smack_cred_prepare
),
4576 LSM_HOOK_INIT(cred_transfer
, smack_cred_transfer
),
4577 LSM_HOOK_INIT(kernel_act_as
, smack_kernel_act_as
),
4578 LSM_HOOK_INIT(kernel_create_files_as
, smack_kernel_create_files_as
),
4579 LSM_HOOK_INIT(task_setpgid
, smack_task_setpgid
),
4580 LSM_HOOK_INIT(task_getpgid
, smack_task_getpgid
),
4581 LSM_HOOK_INIT(task_getsid
, smack_task_getsid
),
4582 LSM_HOOK_INIT(task_getsecid
, smack_task_getsecid
),
4583 LSM_HOOK_INIT(task_setnice
, smack_task_setnice
),
4584 LSM_HOOK_INIT(task_setioprio
, smack_task_setioprio
),
4585 LSM_HOOK_INIT(task_getioprio
, smack_task_getioprio
),
4586 LSM_HOOK_INIT(task_setscheduler
, smack_task_setscheduler
),
4587 LSM_HOOK_INIT(task_getscheduler
, smack_task_getscheduler
),
4588 LSM_HOOK_INIT(task_movememory
, smack_task_movememory
),
4589 LSM_HOOK_INIT(task_kill
, smack_task_kill
),
4590 LSM_HOOK_INIT(task_wait
, smack_task_wait
),
4591 LSM_HOOK_INIT(task_to_inode
, smack_task_to_inode
),
4593 LSM_HOOK_INIT(ipc_permission
, smack_ipc_permission
),
4594 LSM_HOOK_INIT(ipc_getsecid
, smack_ipc_getsecid
),
4596 LSM_HOOK_INIT(msg_msg_alloc_security
, smack_msg_msg_alloc_security
),
4597 LSM_HOOK_INIT(msg_msg_free_security
, smack_msg_msg_free_security
),
4599 LSM_HOOK_INIT(msg_queue_alloc_security
, smack_msg_queue_alloc_security
),
4600 LSM_HOOK_INIT(msg_queue_free_security
, smack_msg_queue_free_security
),
4601 LSM_HOOK_INIT(msg_queue_associate
, smack_msg_queue_associate
),
4602 LSM_HOOK_INIT(msg_queue_msgctl
, smack_msg_queue_msgctl
),
4603 LSM_HOOK_INIT(msg_queue_msgsnd
, smack_msg_queue_msgsnd
),
4604 LSM_HOOK_INIT(msg_queue_msgrcv
, smack_msg_queue_msgrcv
),
4606 LSM_HOOK_INIT(shm_alloc_security
, smack_shm_alloc_security
),
4607 LSM_HOOK_INIT(shm_free_security
, smack_shm_free_security
),
4608 LSM_HOOK_INIT(shm_associate
, smack_shm_associate
),
4609 LSM_HOOK_INIT(shm_shmctl
, smack_shm_shmctl
),
4610 LSM_HOOK_INIT(shm_shmat
, smack_shm_shmat
),
4612 LSM_HOOK_INIT(sem_alloc_security
, smack_sem_alloc_security
),
4613 LSM_HOOK_INIT(sem_free_security
, smack_sem_free_security
),
4614 LSM_HOOK_INIT(sem_associate
, smack_sem_associate
),
4615 LSM_HOOK_INIT(sem_semctl
, smack_sem_semctl
),
4616 LSM_HOOK_INIT(sem_semop
, smack_sem_semop
),
4618 LSM_HOOK_INIT(d_instantiate
, smack_d_instantiate
),
4620 LSM_HOOK_INIT(getprocattr
, smack_getprocattr
),
4621 LSM_HOOK_INIT(setprocattr
, smack_setprocattr
),
4623 LSM_HOOK_INIT(unix_stream_connect
, smack_unix_stream_connect
),
4624 LSM_HOOK_INIT(unix_may_send
, smack_unix_may_send
),
4626 LSM_HOOK_INIT(socket_post_create
, smack_socket_post_create
),
4627 #ifdef SMACK_IPV6_PORT_LABELING
4628 LSM_HOOK_INIT(socket_bind
, smack_socket_bind
),
4630 LSM_HOOK_INIT(socket_connect
, smack_socket_connect
),
4631 LSM_HOOK_INIT(socket_sendmsg
, smack_socket_sendmsg
),
4632 LSM_HOOK_INIT(socket_sock_rcv_skb
, smack_socket_sock_rcv_skb
),
4633 LSM_HOOK_INIT(socket_getpeersec_stream
, smack_socket_getpeersec_stream
),
4634 LSM_HOOK_INIT(socket_getpeersec_dgram
, smack_socket_getpeersec_dgram
),
4635 LSM_HOOK_INIT(sk_alloc_security
, smack_sk_alloc_security
),
4636 LSM_HOOK_INIT(sk_free_security
, smack_sk_free_security
),
4637 LSM_HOOK_INIT(sock_graft
, smack_sock_graft
),
4638 LSM_HOOK_INIT(inet_conn_request
, smack_inet_conn_request
),
4639 LSM_HOOK_INIT(inet_csk_clone
, smack_inet_csk_clone
),
4641 /* key management security hooks */
4643 LSM_HOOK_INIT(key_alloc
, smack_key_alloc
),
4644 LSM_HOOK_INIT(key_free
, smack_key_free
),
4645 LSM_HOOK_INIT(key_permission
, smack_key_permission
),
4646 LSM_HOOK_INIT(key_getsecurity
, smack_key_getsecurity
),
4647 #endif /* CONFIG_KEYS */
4651 LSM_HOOK_INIT(audit_rule_init
, smack_audit_rule_init
),
4652 LSM_HOOK_INIT(audit_rule_known
, smack_audit_rule_known
),
4653 LSM_HOOK_INIT(audit_rule_match
, smack_audit_rule_match
),
4654 LSM_HOOK_INIT(audit_rule_free
, smack_audit_rule_free
),
4655 #endif /* CONFIG_AUDIT */
4657 LSM_HOOK_INIT(ismaclabel
, smack_ismaclabel
),
4658 LSM_HOOK_INIT(secid_to_secctx
, smack_secid_to_secctx
),
4659 LSM_HOOK_INIT(secctx_to_secid
, smack_secctx_to_secid
),
4660 LSM_HOOK_INIT(release_secctx
, smack_release_secctx
),
4661 LSM_HOOK_INIT(inode_notifysecctx
, smack_inode_notifysecctx
),
4662 LSM_HOOK_INIT(inode_setsecctx
, smack_inode_setsecctx
),
4663 LSM_HOOK_INIT(inode_getsecctx
, smack_inode_getsecctx
),
4667 static __init
void init_smack_known_list(void)
4670 * Initialize rule list locks
4672 mutex_init(&smack_known_huh
.smk_rules_lock
);
4673 mutex_init(&smack_known_hat
.smk_rules_lock
);
4674 mutex_init(&smack_known_floor
.smk_rules_lock
);
4675 mutex_init(&smack_known_star
.smk_rules_lock
);
4676 mutex_init(&smack_known_invalid
.smk_rules_lock
);
4677 mutex_init(&smack_known_web
.smk_rules_lock
);
4679 * Initialize rule lists
4681 INIT_LIST_HEAD(&smack_known_huh
.smk_rules
);
4682 INIT_LIST_HEAD(&smack_known_hat
.smk_rules
);
4683 INIT_LIST_HEAD(&smack_known_star
.smk_rules
);
4684 INIT_LIST_HEAD(&smack_known_floor
.smk_rules
);
4685 INIT_LIST_HEAD(&smack_known_invalid
.smk_rules
);
4686 INIT_LIST_HEAD(&smack_known_web
.smk_rules
);
4688 * Create the known labels list
4690 smk_insert_entry(&smack_known_huh
);
4691 smk_insert_entry(&smack_known_hat
);
4692 smk_insert_entry(&smack_known_star
);
4693 smk_insert_entry(&smack_known_floor
);
4694 smk_insert_entry(&smack_known_invalid
);
4695 smk_insert_entry(&smack_known_web
);
4699 * smack_init - initialize the smack system
4703 static __init
int smack_init(void)
4706 struct task_smack
*tsp
;
4708 if (!security_module_enable("smack"))
4713 smack_inode_cache
= KMEM_CACHE(inode_smack
, 0);
4714 if (!smack_inode_cache
)
4717 tsp
= new_task_smack(&smack_known_floor
, &smack_known_floor
,
4720 kmem_cache_destroy(smack_inode_cache
);
4724 pr_info("Smack: Initializing.\n");
4725 #ifdef CONFIG_SECURITY_SMACK_NETFILTER
4726 pr_info("Smack: Netfilter enabled.\n");
4728 #ifdef SMACK_IPV6_PORT_LABELING
4729 pr_info("Smack: IPv6 port labeling enabled.\n");
4731 #ifdef SMACK_IPV6_SECMARK_LABELING
4732 pr_info("Smack: IPv6 Netfilter enabled.\n");
4736 * Set the security state for the initial task.
4738 cred
= (struct cred
*) current
->cred
;
4739 cred
->security
= tsp
;
4741 /* initialize the smack_known_list */
4742 init_smack_known_list();
4747 security_add_hooks(smack_hooks
, ARRAY_SIZE(smack_hooks
));
4753 * Smack requires early initialization in order to label
4754 * all processes and objects when they are created.
4756 security_initcall(smack_init
);