2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2,
13 * as published by the Free Software Foundation.
16 #include <linux/xattr.h>
17 #include <linux/pagemap.h>
18 #include <linux/mount.h>
19 #include <linux/stat.h>
20 #include <linux/ext2_fs.h>
22 #include <asm/ioctls.h>
23 #include <linux/tcp.h>
24 #include <linux/udp.h>
25 #include <linux/mutex.h>
26 #include <linux/pipe_fs_i.h>
27 #include <net/netlabel.h>
28 #include <net/cipso_ipv4.h>
29 #include <linux/audit.h>
33 #define task_security(task) (task_cred_xxx((task), security))
36 * I hope these are the hokeyist lines of code in the module. Casey.
38 #define DEVPTS_SUPER_MAGIC 0x1cd1
39 #define SOCKFS_MAGIC 0x534F434B
40 #define TMPFS_MAGIC 0x01021994
43 * smk_fetch - Fetch the smack label from a file.
44 * @ip: a pointer to the inode
45 * @dp: a pointer to the dentry
47 * Returns a pointer to the master list entry for the Smack label
48 * or NULL if there was no label to fetch.
50 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
53 char in
[SMK_LABELLEN
];
55 if (ip
->i_op
->getxattr
== NULL
)
58 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
62 return smk_import(in
, rc
);
66 * new_inode_smack - allocate an inode security blob
67 * @smack: a pointer to the Smack label to use in the blob
69 * Returns the new blob or NULL if there's no memory available
71 struct inode_smack
*new_inode_smack(char *smack
)
73 struct inode_smack
*isp
;
75 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
79 isp
->smk_inode
= smack
;
81 mutex_init(&isp
->smk_lock
);
92 * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH
93 * @ctp: child task pointer
94 * @mode: ptrace attachment mode
96 * Returns 0 if access is OK, an error code otherwise
98 * Do the capability checks, and require read and write.
100 static int smack_ptrace_may_access(struct task_struct
*ctp
, unsigned int mode
)
104 rc
= cap_ptrace_may_access(ctp
, mode
);
108 rc
= smk_access(current_security(), task_security(ctp
), MAY_READWRITE
);
109 if (rc
!= 0 && capable(CAP_MAC_OVERRIDE
))
115 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
116 * @ptp: parent task pointer
118 * Returns 0 if access is OK, an error code otherwise
120 * Do the capability checks, and require read and write.
122 static int smack_ptrace_traceme(struct task_struct
*ptp
)
126 rc
= cap_ptrace_traceme(ptp
);
130 rc
= smk_access(task_security(ptp
), current_security(), MAY_READWRITE
);
131 if (rc
!= 0 && has_capability(ptp
, CAP_MAC_OVERRIDE
))
137 * smack_syslog - Smack approval on syslog
138 * @type: message type
140 * Require that the task has the floor label
142 * Returns 0 on success, error code otherwise.
144 static int smack_syslog(int type
)
147 char *sp
= current_security();
149 rc
= cap_syslog(type
);
153 if (capable(CAP_MAC_OVERRIDE
))
156 if (sp
!= smack_known_floor
.smk_known
)
168 * smack_sb_alloc_security - allocate a superblock blob
169 * @sb: the superblock getting the blob
171 * Returns 0 on success or -ENOMEM on error.
173 static int smack_sb_alloc_security(struct super_block
*sb
)
175 struct superblock_smack
*sbsp
;
177 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
182 sbsp
->smk_root
= smack_known_floor
.smk_known
;
183 sbsp
->smk_default
= smack_known_floor
.smk_known
;
184 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
185 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
186 sbsp
->smk_initialized
= 0;
187 spin_lock_init(&sbsp
->smk_sblock
);
189 sb
->s_security
= sbsp
;
195 * smack_sb_free_security - free a superblock blob
196 * @sb: the superblock getting the blob
199 static void smack_sb_free_security(struct super_block
*sb
)
201 kfree(sb
->s_security
);
202 sb
->s_security
= NULL
;
206 * smack_sb_copy_data - copy mount options data for processing
207 * @orig: where to start
208 * @smackopts: mount options string
210 * Returns 0 on success or -ENOMEM on error.
212 * Copy the Smack specific mount options out of the mount
215 static int smack_sb_copy_data(char *orig
, char *smackopts
)
217 char *cp
, *commap
, *otheropts
, *dp
;
219 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
220 if (otheropts
== NULL
)
223 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
224 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
226 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
228 else if (strstr(cp
, SMK_FSHAT
) == cp
)
230 else if (strstr(cp
, SMK_FSROOT
) == cp
)
235 commap
= strchr(cp
, ',');
244 strcpy(orig
, otheropts
);
245 free_page((unsigned long)otheropts
);
251 * smack_sb_kern_mount - Smack specific mount processing
252 * @sb: the file system superblock
253 * @flags: the mount flags
254 * @data: the smack mount options
256 * Returns 0 on success, an error code on failure
258 static int smack_sb_kern_mount(struct super_block
*sb
, int flags
, void *data
)
260 struct dentry
*root
= sb
->s_root
;
261 struct inode
*inode
= root
->d_inode
;
262 struct superblock_smack
*sp
= sb
->s_security
;
263 struct inode_smack
*isp
;
268 spin_lock(&sp
->smk_sblock
);
269 if (sp
->smk_initialized
!= 0) {
270 spin_unlock(&sp
->smk_sblock
);
273 sp
->smk_initialized
= 1;
274 spin_unlock(&sp
->smk_sblock
);
276 for (op
= data
; op
!= NULL
; op
= commap
) {
277 commap
= strchr(op
, ',');
281 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
282 op
+= strlen(SMK_FSHAT
);
283 nsp
= smk_import(op
, 0);
286 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
287 op
+= strlen(SMK_FSFLOOR
);
288 nsp
= smk_import(op
, 0);
291 } else if (strncmp(op
, SMK_FSDEFAULT
,
292 strlen(SMK_FSDEFAULT
)) == 0) {
293 op
+= strlen(SMK_FSDEFAULT
);
294 nsp
= smk_import(op
, 0);
296 sp
->smk_default
= nsp
;
297 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
298 op
+= strlen(SMK_FSROOT
);
299 nsp
= smk_import(op
, 0);
306 * Initialize the root inode.
308 isp
= inode
->i_security
;
310 inode
->i_security
= new_inode_smack(sp
->smk_root
);
312 isp
->smk_inode
= sp
->smk_root
;
318 * smack_sb_statfs - Smack check on statfs
319 * @dentry: identifies the file system in question
321 * Returns 0 if current can read the floor of the filesystem,
322 * and error code otherwise
324 static int smack_sb_statfs(struct dentry
*dentry
)
326 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
328 return smk_curacc(sbp
->smk_floor
, MAY_READ
);
332 * smack_sb_mount - Smack check for mounting
339 * Returns 0 if current can write the floor of the filesystem
340 * being mounted on, an error code otherwise.
342 static int smack_sb_mount(char *dev_name
, struct path
*path
,
343 char *type
, unsigned long flags
, void *data
)
345 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
347 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
351 * smack_sb_umount - Smack check for unmounting
352 * @mnt: file system to unmount
355 * Returns 0 if current can write the floor of the filesystem
356 * being unmounted, an error code otherwise.
358 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
360 struct superblock_smack
*sbp
;
362 sbp
= mnt
->mnt_sb
->s_security
;
364 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
372 * smack_inode_alloc_security - allocate an inode blob
373 * @inode: the inode in need of a blob
375 * Returns 0 if it gets a blob, -ENOMEM otherwise
377 static int smack_inode_alloc_security(struct inode
*inode
)
379 inode
->i_security
= new_inode_smack(current_security());
380 if (inode
->i_security
== NULL
)
386 * smack_inode_free_security - free an inode blob
387 * @inode: the inode with a blob
389 * Clears the blob pointer in inode
391 static void smack_inode_free_security(struct inode
*inode
)
393 kfree(inode
->i_security
);
394 inode
->i_security
= NULL
;
398 * smack_inode_init_security - copy out the smack from an inode
401 * @name: where to put the attribute name
402 * @value: where to put the attribute value
403 * @len: where to put the length of the attribute
405 * Returns 0 if it all works out, -ENOMEM if there's no memory
407 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
408 char **name
, void **value
, size_t *len
)
410 char *isp
= smk_of_inode(inode
);
413 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
419 *value
= kstrdup(isp
, GFP_KERNEL
);
425 *len
= strlen(isp
) + 1;
431 * smack_inode_link - Smack check on link
432 * @old_dentry: the existing object
434 * @new_dentry: the new object
436 * Returns 0 if access is permitted, an error code otherwise
438 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
439 struct dentry
*new_dentry
)
444 isp
= smk_of_inode(old_dentry
->d_inode
);
445 rc
= smk_curacc(isp
, MAY_WRITE
);
447 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
448 isp
= smk_of_inode(new_dentry
->d_inode
);
449 rc
= smk_curacc(isp
, MAY_WRITE
);
456 * smack_inode_unlink - Smack check on inode deletion
457 * @dir: containing directory object
458 * @dentry: file to unlink
460 * Returns 0 if current can write the containing directory
461 * and the object, error code otherwise
463 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
465 struct inode
*ip
= dentry
->d_inode
;
469 * You need write access to the thing you're unlinking
471 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
);
474 * You also need write access to the containing directory
476 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
482 * smack_inode_rmdir - Smack check on directory deletion
483 * @dir: containing directory object
484 * @dentry: directory to unlink
486 * Returns 0 if current can write the containing directory
487 * and the directory, error code otherwise
489 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
494 * You need write access to the thing you're removing
496 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
499 * You also need write access to the containing directory
501 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
507 * smack_inode_rename - Smack check on rename
508 * @old_inode: the old directory
509 * @old_dentry: unused
510 * @new_inode: the new directory
511 * @new_dentry: unused
513 * Read and write access is required on both the old and
516 * Returns 0 if access is permitted, an error code otherwise
518 static int smack_inode_rename(struct inode
*old_inode
,
519 struct dentry
*old_dentry
,
520 struct inode
*new_inode
,
521 struct dentry
*new_dentry
)
526 isp
= smk_of_inode(old_dentry
->d_inode
);
527 rc
= smk_curacc(isp
, MAY_READWRITE
);
529 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
530 isp
= smk_of_inode(new_dentry
->d_inode
);
531 rc
= smk_curacc(isp
, MAY_READWRITE
);
538 * smack_inode_permission - Smack version of permission()
539 * @inode: the inode in question
540 * @mask: the access requested
542 * This is the important Smack hook.
544 * Returns 0 if access is permitted, -EACCES otherwise
546 static int smack_inode_permission(struct inode
*inode
, int mask
)
549 * No permission to check. Existence test. Yup, it's there.
554 return smk_curacc(smk_of_inode(inode
), mask
);
558 * smack_inode_setattr - Smack check for setting attributes
559 * @dentry: the object
560 * @iattr: for the force flag
562 * Returns 0 if access is permitted, an error code otherwise
564 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
567 * Need to allow for clearing the setuid bit.
569 if (iattr
->ia_valid
& ATTR_FORCE
)
572 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
576 * smack_inode_getattr - Smack check for getting attributes
578 * @dentry: the object
580 * Returns 0 if access is permitted, an error code otherwise
582 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
584 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
588 * smack_inode_setxattr - Smack check for setting xattrs
589 * @dentry: the object
590 * @name: name of the attribute
595 * This protects the Smack attribute explicitly.
597 * Returns 0 if access is permitted, an error code otherwise
599 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
600 const void *value
, size_t size
, int flags
)
604 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
605 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
606 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
607 if (!capable(CAP_MAC_ADMIN
))
610 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
613 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
619 * smack_inode_post_setxattr - Apply the Smack update approved above
621 * @name: attribute name
622 * @value: attribute value
623 * @size: attribute size
626 * Set the pointer in the inode blob to the entry found
627 * in the master label list.
629 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
630 const void *value
, size_t size
, int flags
)
632 struct inode_smack
*isp
;
638 if (strcmp(name
, XATTR_NAME_SMACK
))
641 if (size
>= SMK_LABELLEN
)
644 isp
= dentry
->d_inode
->i_security
;
647 * No locking is done here. This is a pointer
650 nsp
= smk_import(value
, size
);
652 isp
->smk_inode
= nsp
;
654 isp
->smk_inode
= smack_known_invalid
.smk_known
;
660 * smack_inode_getxattr - Smack check on getxattr
661 * @dentry: the object
664 * Returns 0 if access is permitted, an error code otherwise
666 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
668 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
672 * smack_inode_removexattr - Smack check on removexattr
673 * @dentry: the object
674 * @name: name of the attribute
676 * Removing the Smack attribute requires CAP_MAC_ADMIN
678 * Returns 0 if access is permitted, an error code otherwise
680 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
684 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
685 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
686 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
687 if (!capable(CAP_MAC_ADMIN
))
690 rc
= cap_inode_removexattr(dentry
, name
);
693 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
699 * smack_inode_getsecurity - get smack xattrs
701 * @name: attribute name
702 * @buffer: where to put the result
705 * Returns the size of the attribute or an error code
707 static int smack_inode_getsecurity(const struct inode
*inode
,
708 const char *name
, void **buffer
,
711 struct socket_smack
*ssp
;
713 struct super_block
*sbp
;
714 struct inode
*ip
= (struct inode
*)inode
;
719 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
720 isp
= smk_of_inode(inode
);
721 ilen
= strlen(isp
) + 1;
727 * The rest of the Smack xattrs are only on sockets.
730 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
734 if (sock
== NULL
|| sock
->sk
== NULL
)
737 ssp
= sock
->sk
->sk_security
;
739 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
741 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
746 ilen
= strlen(isp
) + 1;
757 * smack_inode_listsecurity - list the Smack attributes
759 * @buffer: where they go
760 * @buffer_size: size of buffer
762 * Returns 0 on success, -EINVAL otherwise
764 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
767 int len
= strlen(XATTR_NAME_SMACK
);
769 if (buffer
!= NULL
&& len
<= buffer_size
) {
770 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
777 * smack_inode_getsecid - Extract inode's security id
778 * @inode: inode to extract the info from
779 * @secid: where result will be saved
781 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
783 struct inode_smack
*isp
= inode
->i_security
;
785 *secid
= smack_to_secid(isp
->smk_inode
);
793 * smack_file_permission - Smack check on file operations
799 * Should access checks be done on each read or write?
800 * UNICOS and SELinux say yes.
801 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
803 * I'll say no for now. Smack does not do the frequent
804 * label changing that SELinux does.
806 static int smack_file_permission(struct file
*file
, int mask
)
812 * smack_file_alloc_security - assign a file security blob
815 * The security blob for a file is a pointer to the master
816 * label list, so no allocation is done.
820 static int smack_file_alloc_security(struct file
*file
)
822 file
->f_security
= current_security();
827 * smack_file_free_security - clear a file security blob
830 * The security blob for a file is a pointer to the master
831 * label list, so no memory is freed.
833 static void smack_file_free_security(struct file
*file
)
835 file
->f_security
= NULL
;
839 * smack_file_ioctl - Smack check on ioctls
844 * Relies heavily on the correct use of the ioctl command conventions.
846 * Returns 0 if allowed, error code otherwise
848 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
853 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
854 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
856 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
857 rc
= smk_curacc(file
->f_security
, MAY_READ
);
863 * smack_file_lock - Smack check on file locking
867 * Returns 0 if current has write access, error code otherwise
869 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
871 return smk_curacc(file
->f_security
, MAY_WRITE
);
875 * smack_file_fcntl - Smack check on fcntl
877 * @cmd: what action to check
880 * Returns 0 if current has access, error code otherwise
882 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
894 rc
= smk_curacc(file
->f_security
, MAY_READ
);
902 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
905 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
);
912 * smack_file_set_fowner - set the file security blob value
913 * @file: object in question
916 * Further research may be required on this one.
918 static int smack_file_set_fowner(struct file
*file
)
920 file
->f_security
= current_security();
925 * smack_file_send_sigiotask - Smack on sigio
926 * @tsk: The target task
927 * @fown: the object the signal come from
930 * Allow a privileged task to get signals even if it shouldn't
932 * Returns 0 if a subject with the object's smack could
933 * write to the task, an error code otherwise.
935 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
936 struct fown_struct
*fown
, int signum
)
942 * struct fown_struct is never outside the context of a struct file
944 file
= container_of(fown
, struct file
, f_owner
);
945 rc
= smk_access(file
->f_security
, tsk
->cred
->security
, MAY_WRITE
);
946 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
952 * smack_file_receive - Smack file receive check
955 * Returns 0 if current has access, error code otherwise
957 static int smack_file_receive(struct file
*file
)
962 * This code relies on bitmasks.
964 if (file
->f_mode
& FMODE_READ
)
966 if (file
->f_mode
& FMODE_WRITE
)
969 return smk_curacc(file
->f_security
, may
);
977 * smack_cred_free - "free" task-level security credentials
978 * @cred: the credentials in question
980 * Smack isn't using copies of blobs. Everyone
981 * points to an immutable list. The blobs never go away.
982 * There is no leak here.
984 static void smack_cred_free(struct cred
*cred
)
986 cred
->security
= NULL
;
990 * smack_cred_prepare - prepare new set of credentials for modification
991 * @new: the new credentials
992 * @old: the original credentials
993 * @gfp: the atomicity of any memory allocations
995 * Prepare a new set of credentials for modification.
997 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1000 new->security
= old
->security
;
1005 * smack_cred_commit - commit new credentials
1006 * @new: the new credentials
1007 * @old: the original credentials
1009 static void smack_cred_commit(struct cred
*new, const struct cred
*old
)
1014 * smack_kernel_act_as - Set the subjective context in a set of credentials
1015 * @new: points to the set of credentials to be modified.
1016 * @secid: specifies the security ID to be set
1018 * Set the security data for a kernel service.
1020 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1022 char *smack
= smack_from_secid(secid
);
1027 new->security
= smack
;
1032 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1033 * @new: points to the set of credentials to be modified
1034 * @inode: points to the inode to use as a reference
1036 * Set the file creation context in a set of credentials to the same
1037 * as the objective context of the specified inode
1039 static int smack_kernel_create_files_as(struct cred
*new,
1040 struct inode
*inode
)
1042 struct inode_smack
*isp
= inode
->i_security
;
1044 new->security
= isp
->smk_inode
;
1049 * smack_task_setpgid - Smack check on setting pgid
1050 * @p: the task object
1053 * Return 0 if write access is permitted
1055 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1057 return smk_curacc(task_security(p
), MAY_WRITE
);
1061 * smack_task_getpgid - Smack access check for getpgid
1062 * @p: the object task
1064 * Returns 0 if current can read the object task, error code otherwise
1066 static int smack_task_getpgid(struct task_struct
*p
)
1068 return smk_curacc(task_security(p
), MAY_READ
);
1072 * smack_task_getsid - Smack access check for getsid
1073 * @p: the object task
1075 * Returns 0 if current can read the object task, error code otherwise
1077 static int smack_task_getsid(struct task_struct
*p
)
1079 return smk_curacc(task_security(p
), MAY_READ
);
1083 * smack_task_getsecid - get the secid of the task
1084 * @p: the object task
1085 * @secid: where to put the result
1087 * Sets the secid to contain a u32 version of the smack label.
1089 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1091 *secid
= smack_to_secid(task_security(p
));
1095 * smack_task_setnice - Smack check on setting nice
1096 * @p: the task object
1099 * Return 0 if write access is permitted
1101 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1105 rc
= cap_task_setnice(p
, nice
);
1107 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1112 * smack_task_setioprio - Smack check on setting ioprio
1113 * @p: the task object
1116 * Return 0 if write access is permitted
1118 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1122 rc
= cap_task_setioprio(p
, ioprio
);
1124 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1129 * smack_task_getioprio - Smack check on reading ioprio
1130 * @p: the task object
1132 * Return 0 if read access is permitted
1134 static int smack_task_getioprio(struct task_struct
*p
)
1136 return smk_curacc(task_security(p
), MAY_READ
);
1140 * smack_task_setscheduler - Smack check on setting scheduler
1141 * @p: the task object
1145 * Return 0 if read access is permitted
1147 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1148 struct sched_param
*lp
)
1152 rc
= cap_task_setscheduler(p
, policy
, lp
);
1154 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1159 * smack_task_getscheduler - Smack check on reading scheduler
1160 * @p: the task object
1162 * Return 0 if read access is permitted
1164 static int smack_task_getscheduler(struct task_struct
*p
)
1166 return smk_curacc(task_security(p
), MAY_READ
);
1170 * smack_task_movememory - Smack check on moving memory
1171 * @p: the task object
1173 * Return 0 if write access is permitted
1175 static int smack_task_movememory(struct task_struct
*p
)
1177 return smk_curacc(task_security(p
), MAY_WRITE
);
1181 * smack_task_kill - Smack check on signal delivery
1182 * @p: the task object
1185 * @secid: identifies the smack to use in lieu of current's
1187 * Return 0 if write access is permitted
1189 * The secid behavior is an artifact of an SELinux hack
1190 * in the USB code. Someday it may go away.
1192 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1196 * Sending a signal requires that the sender
1197 * can write the receiver.
1200 return smk_curacc(task_security(p
), MAY_WRITE
);
1202 * If the secid isn't 0 we're dealing with some USB IO
1203 * specific behavior. This is not clean. For one thing
1204 * we can't take privilege into account.
1206 return smk_access(smack_from_secid(secid
), task_security(p
), MAY_WRITE
);
1210 * smack_task_wait - Smack access check for waiting
1211 * @p: task to wait for
1213 * Returns 0 if current can wait for p, error code otherwise
1215 static int smack_task_wait(struct task_struct
*p
)
1219 rc
= smk_access(current_security(), task_security(p
), MAY_WRITE
);
1224 * Allow the operation to succeed if either task
1225 * has privilege to perform operations that might
1226 * account for the smack labels having gotten to
1227 * be different in the first place.
1229 * This breaks the strict subject/object access
1230 * control ideal, taking the object's privilege
1231 * state into account in the decision as well as
1234 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1241 * smack_task_to_inode - copy task smack into the inode blob
1242 * @p: task to copy from
1243 * @inode: inode to copy to
1245 * Sets the smack pointer in the inode security blob
1247 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1249 struct inode_smack
*isp
= inode
->i_security
;
1250 isp
->smk_inode
= task_security(p
);
1258 * smack_sk_alloc_security - Allocate a socket blob
1261 * @gfp_flags: memory allocation flags
1263 * Assign Smack pointers to current
1265 * Returns 0 on success, -ENOMEM is there's no memory
1267 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1269 char *csp
= current_security();
1270 struct socket_smack
*ssp
;
1272 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1278 ssp
->smk_labeled
= SMACK_CIPSO_SOCKET
;
1279 ssp
->smk_packet
[0] = '\0';
1281 sk
->sk_security
= ssp
;
1287 * smack_sk_free_security - Free a socket blob
1290 * Clears the blob pointer
1292 static void smack_sk_free_security(struct sock
*sk
)
1294 kfree(sk
->sk_security
);
1298 * smack_set_catset - convert a capset to netlabel mls categories
1299 * @catset: the Smack categories
1300 * @sap: where to put the netlabel categories
1302 * Allocates and fills attr.mls.cat
1304 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1315 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1316 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1317 sap
->attr
.mls
.cat
->startbit
= 0;
1319 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1320 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1323 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1329 * smack_to_secattr - fill a secattr from a smack value
1330 * @smack: the smack value
1331 * @nlsp: where the result goes
1333 * Casey says that CIPSO is good enough for now.
1334 * It can be used to effect.
1335 * It can also be abused to effect when necessary.
1336 * Appologies to the TSIG group in general and GW in particular.
1338 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1340 struct smack_cipso cipso
;
1343 nlsp
->domain
= smack
;
1344 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1346 rc
= smack_to_cipso(smack
, &cipso
);
1348 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1349 smack_set_catset(cipso
.smk_catset
, nlsp
);
1351 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1352 smack_set_catset(smack
, nlsp
);
1357 * smack_netlabel - Set the secattr on a socket
1359 * @labeled: socket label scheme
1361 * Convert the outbound smack value (smk_out) to a
1362 * secattr and attach it to the socket.
1364 * Returns 0 on success or an error code
1366 static int smack_netlabel(struct sock
*sk
, int labeled
)
1368 struct socket_smack
*ssp
;
1369 struct netlbl_lsm_secattr secattr
;
1372 ssp
= sk
->sk_security
;
1374 * Usually the netlabel code will handle changing the
1375 * packet labeling based on the label.
1376 * The case of a single label host is different, because
1377 * a single label host should never get a labeled packet
1378 * even though the label is usually associated with a packet
1382 bh_lock_sock_nested(sk
);
1384 if (ssp
->smk_out
== smack_net_ambient
||
1385 labeled
== SMACK_UNLABELED_SOCKET
)
1386 netlbl_sock_delattr(sk
);
1388 netlbl_secattr_init(&secattr
);
1389 smack_to_secattr(ssp
->smk_out
, &secattr
);
1390 rc
= netlbl_sock_setattr(sk
, sk
->sk_family
, &secattr
);
1391 netlbl_secattr_destroy(&secattr
);
1397 * Remember the label scheme used so that it is not
1398 * necessary to do the netlabel setting if it has not
1399 * changed the next time through.
1401 * The -EDESTADDRREQ case is an indication that there's
1402 * a single level host involved.
1405 ssp
->smk_labeled
= labeled
;
1411 * smack_inode_setsecurity - set smack xattrs
1412 * @inode: the object
1413 * @name: attribute name
1414 * @value: attribute value
1415 * @size: size of the attribute
1418 * Sets the named attribute in the appropriate blob
1420 * Returns 0 on success, or an error code
1422 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1423 const void *value
, size_t size
, int flags
)
1426 struct inode_smack
*nsp
= inode
->i_security
;
1427 struct socket_smack
*ssp
;
1428 struct socket
*sock
;
1431 if (value
== NULL
|| size
> SMK_LABELLEN
)
1434 sp
= smk_import(value
, size
);
1438 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1439 nsp
->smk_inode
= sp
;
1443 * The rest of the Smack xattrs are only on sockets.
1445 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1448 sock
= SOCKET_I(inode
);
1449 if (sock
== NULL
|| sock
->sk
== NULL
)
1452 ssp
= sock
->sk
->sk_security
;
1454 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1456 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1458 rc
= smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1460 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1469 * smack_socket_post_create - finish socket setup
1471 * @family: protocol family
1476 * Sets the netlabel information on the socket
1478 * Returns 0 on success, and error code otherwise
1480 static int smack_socket_post_create(struct socket
*sock
, int family
,
1481 int type
, int protocol
, int kern
)
1483 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1486 * Set the outbound netlbl.
1488 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1493 * smack_host_label - check host based restrictions
1494 * @sip: the object end
1496 * looks for host based access restrictions
1498 * This version will only be appropriate for really small
1499 * sets of single label hosts.
1501 * Returns the label of the far end or NULL if it's not special.
1503 static char *smack_host_label(struct sockaddr_in
*sip
)
1505 struct smk_netlbladdr
*snp
;
1506 struct in_addr
*siap
= &sip
->sin_addr
;
1508 if (siap
->s_addr
== 0)
1512 list_for_each_entry_rcu(snp
, &smk_netlbladdr_list
, list
) {
1514 * we break after finding the first match because
1515 * the list is sorted from longest to shortest mask
1516 * so we have found the most specific match
1518 if ((&snp
->smk_host
.sin_addr
)->s_addr
==
1519 (siap
->s_addr
& (&snp
->smk_mask
)->s_addr
)) {
1521 return snp
->smk_label
;
1529 * smack_socket_connect - connect access check
1531 * @sap: the other end
1532 * @addrlen: size of sap
1534 * Verifies that a connection may be possible
1536 * Returns 0 on success, and error code otherwise
1538 static int smack_socket_connect(struct socket
*sock
, struct sockaddr
*sap
,
1541 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
1545 if (sock
->sk
== NULL
|| sock
->sk
->sk_family
!= PF_INET
)
1548 if (addrlen
< sizeof(struct sockaddr_in
))
1551 hostsp
= smack_host_label((struct sockaddr_in
*)sap
);
1552 if (hostsp
== NULL
) {
1553 if (ssp
->smk_labeled
!= SMACK_CIPSO_SOCKET
)
1554 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
1558 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
);
1562 if (ssp
->smk_labeled
!= SMACK_UNLABELED_SOCKET
)
1563 return smack_netlabel(sock
->sk
, SMACK_UNLABELED_SOCKET
);
1568 * smack_flags_to_may - convert S_ to MAY_ values
1569 * @flags: the S_ value
1571 * Returns the equivalent MAY_ value
1573 static int smack_flags_to_may(int flags
)
1577 if (flags
& S_IRUGO
)
1579 if (flags
& S_IWUGO
)
1581 if (flags
& S_IXUGO
)
1588 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1593 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1595 msg
->security
= current_security();
1600 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1603 * Clears the blob pointer
1605 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1607 msg
->security
= NULL
;
1611 * smack_of_shm - the smack pointer for the shm
1614 * Returns a pointer to the smack value
1616 static char *smack_of_shm(struct shmid_kernel
*shp
)
1618 return (char *)shp
->shm_perm
.security
;
1622 * smack_shm_alloc_security - Set the security blob for shm
1627 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1629 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1631 isp
->security
= current_security();
1636 * smack_shm_free_security - Clear the security blob for shm
1639 * Clears the blob pointer
1641 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1643 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1645 isp
->security
= NULL
;
1649 * smack_shm_associate - Smack access check for shm
1651 * @shmflg: access requested
1653 * Returns 0 if current has the requested access, error code otherwise
1655 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1657 char *ssp
= smack_of_shm(shp
);
1660 may
= smack_flags_to_may(shmflg
);
1661 return smk_curacc(ssp
, may
);
1665 * smack_shm_shmctl - Smack access check for shm
1667 * @cmd: what it wants to do
1669 * Returns 0 if current has the requested access, error code otherwise
1671 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1685 may
= MAY_READWRITE
;
1690 * System level information.
1697 ssp
= smack_of_shm(shp
);
1698 return smk_curacc(ssp
, may
);
1702 * smack_shm_shmat - Smack access for shmat
1705 * @shmflg: access requested
1707 * Returns 0 if current has the requested access, error code otherwise
1709 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1712 char *ssp
= smack_of_shm(shp
);
1715 may
= smack_flags_to_may(shmflg
);
1716 return smk_curacc(ssp
, may
);
1720 * smack_of_sem - the smack pointer for the sem
1723 * Returns a pointer to the smack value
1725 static char *smack_of_sem(struct sem_array
*sma
)
1727 return (char *)sma
->sem_perm
.security
;
1731 * smack_sem_alloc_security - Set the security blob for sem
1736 static int smack_sem_alloc_security(struct sem_array
*sma
)
1738 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1740 isp
->security
= current_security();
1745 * smack_sem_free_security - Clear the security blob for sem
1748 * Clears the blob pointer
1750 static void smack_sem_free_security(struct sem_array
*sma
)
1752 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1754 isp
->security
= NULL
;
1758 * smack_sem_associate - Smack access check for sem
1760 * @semflg: access requested
1762 * Returns 0 if current has the requested access, error code otherwise
1764 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1766 char *ssp
= smack_of_sem(sma
);
1769 may
= smack_flags_to_may(semflg
);
1770 return smk_curacc(ssp
, may
);
1774 * smack_sem_shmctl - Smack access check for sem
1776 * @cmd: what it wants to do
1778 * Returns 0 if current has the requested access, error code otherwise
1780 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1799 may
= MAY_READWRITE
;
1804 * System level information
1811 ssp
= smack_of_sem(sma
);
1812 return smk_curacc(ssp
, may
);
1816 * smack_sem_semop - Smack checks of semaphore operations
1822 * Treated as read and write in all cases.
1824 * Returns 0 if access is allowed, error code otherwise
1826 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
1827 unsigned nsops
, int alter
)
1829 char *ssp
= smack_of_sem(sma
);
1831 return smk_curacc(ssp
, MAY_READWRITE
);
1835 * smack_msg_alloc_security - Set the security blob for msg
1840 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
1842 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1844 kisp
->security
= current_security();
1849 * smack_msg_free_security - Clear the security blob for msg
1852 * Clears the blob pointer
1854 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
1856 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1858 kisp
->security
= NULL
;
1862 * smack_of_msq - the smack pointer for the msq
1865 * Returns a pointer to the smack value
1867 static char *smack_of_msq(struct msg_queue
*msq
)
1869 return (char *)msq
->q_perm
.security
;
1873 * smack_msg_queue_associate - Smack access check for msg_queue
1875 * @msqflg: access requested
1877 * Returns 0 if current has the requested access, error code otherwise
1879 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
1881 char *msp
= smack_of_msq(msq
);
1884 may
= smack_flags_to_may(msqflg
);
1885 return smk_curacc(msp
, may
);
1889 * smack_msg_queue_msgctl - Smack access check for msg_queue
1891 * @cmd: what it wants to do
1893 * Returns 0 if current has the requested access, error code otherwise
1895 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
1907 may
= MAY_READWRITE
;
1912 * System level information
1919 msp
= smack_of_msq(msq
);
1920 return smk_curacc(msp
, may
);
1924 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1927 * @msqflg: access requested
1929 * Returns 0 if current has the requested access, error code otherwise
1931 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
1934 char *msp
= smack_of_msq(msq
);
1937 rc
= smack_flags_to_may(msqflg
);
1938 return smk_curacc(msp
, rc
);
1942 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1949 * Returns 0 if current has read and write access, error code otherwise
1951 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
1952 struct task_struct
*target
, long type
, int mode
)
1954 char *msp
= smack_of_msq(msq
);
1956 return smk_curacc(msp
, MAY_READWRITE
);
1960 * smack_ipc_permission - Smack access for ipc_permission()
1961 * @ipp: the object permissions
1962 * @flag: access requested
1964 * Returns 0 if current has read and write access, error code otherwise
1966 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
1968 char *isp
= ipp
->security
;
1971 may
= smack_flags_to_may(flag
);
1972 return smk_curacc(isp
, may
);
1976 * smack_ipc_getsecid - Extract smack security id
1977 * @ipp: the object permissions
1978 * @secid: where result will be saved
1980 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
1982 char *smack
= ipp
->security
;
1984 *secid
= smack_to_secid(smack
);
1988 * smack_d_instantiate - Make sure the blob is correct on an inode
1989 * @opt_dentry: unused
1990 * @inode: the object
1992 * Set the inode's security blob if it hasn't been done already.
1994 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
1996 struct super_block
*sbp
;
1997 struct superblock_smack
*sbsp
;
1998 struct inode_smack
*isp
;
1999 char *csp
= current_security();
2007 isp
= inode
->i_security
;
2009 mutex_lock(&isp
->smk_lock
);
2011 * If the inode is already instantiated
2012 * take the quick way out
2014 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
2018 sbsp
= sbp
->s_security
;
2020 * We're going to use the superblock default label
2021 * if there's no label on the file.
2023 final
= sbsp
->smk_default
;
2026 * If this is the root inode the superblock
2027 * may be in the process of initialization.
2028 * If that is the case use the root value out
2029 * of the superblock.
2031 if (opt_dentry
->d_parent
== opt_dentry
) {
2032 isp
->smk_inode
= sbsp
->smk_root
;
2033 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2038 * This is pretty hackish.
2039 * Casey says that we shouldn't have to do
2040 * file system specific code, but it does help
2041 * with keeping it simple.
2043 switch (sbp
->s_magic
) {
2046 * Casey says that it's a little embarassing
2047 * that the smack file system doesn't do
2048 * extended attributes.
2050 final
= smack_known_star
.smk_known
;
2054 * Casey says pipes are easy (?)
2056 final
= smack_known_star
.smk_known
;
2058 case DEVPTS_SUPER_MAGIC
:
2060 * devpts seems content with the label of the task.
2061 * Programs that change smack have to treat the
2068 * Casey says sockets get the smack of the task.
2072 case PROC_SUPER_MAGIC
:
2074 * Casey says procfs appears not to care.
2075 * The superblock default suffices.
2080 * Device labels should come from the filesystem,
2081 * but watch out, because they're volitile,
2082 * getting recreated on every reboot.
2084 final
= smack_known_star
.smk_known
;
2088 * If a smack value has been set we want to use it,
2089 * but since tmpfs isn't giving us the opportunity
2090 * to set mount options simulate setting the
2091 * superblock default.
2095 * This isn't an understood special case.
2096 * Get the value from the xattr.
2098 * No xattr support means, alas, no SMACK label.
2099 * Use the aforeapplied default.
2100 * It would be curious if the label of the task
2101 * does not match that assigned.
2103 if (inode
->i_op
->getxattr
== NULL
)
2106 * Get the dentry for xattr.
2108 if (opt_dentry
== NULL
) {
2109 dp
= d_find_alias(inode
);
2113 dp
= dget(opt_dentry
);
2118 fetched
= smk_fetch(inode
, dp
);
2119 if (fetched
!= NULL
)
2127 isp
->smk_inode
= csp
;
2129 isp
->smk_inode
= final
;
2131 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2134 mutex_unlock(&isp
->smk_lock
);
2139 * smack_getprocattr - Smack process attribute access
2140 * @p: the object task
2141 * @name: the name of the attribute in /proc/.../attr
2142 * @value: where to put the result
2144 * Places a copy of the task Smack into value
2146 * Returns the length of the smack label or an error code
2148 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2153 if (strcmp(name
, "current") != 0)
2156 cp
= kstrdup(task_security(p
), GFP_KERNEL
);
2166 * smack_setprocattr - Smack process attribute setting
2167 * @p: the object task
2168 * @name: the name of the attribute in /proc/.../attr
2169 * @value: the value to set
2170 * @size: the size of the value
2172 * Sets the Smack value of the task. Only setting self
2173 * is permitted and only with privilege
2175 * Returns the length of the smack label or an error code
2177 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2178 void *value
, size_t size
)
2184 * Changing another process' Smack value is too dangerous
2185 * and supports no sane use case.
2190 if (!capable(CAP_MAC_ADMIN
))
2193 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2196 if (strcmp(name
, "current") != 0)
2199 newsmack
= smk_import(value
, size
);
2200 if (newsmack
== NULL
)
2204 * No process is ever allowed the web ("@") label.
2206 if (newsmack
== smack_known_web
.smk_known
)
2209 new = prepare_creds();
2212 new->security
= newsmack
;
2218 * smack_unix_stream_connect - Smack access on UDS
2220 * @other: the other socket
2223 * Return 0 if a subject with the smack of sock could access
2224 * an object with the smack of other, otherwise an error code
2226 static int smack_unix_stream_connect(struct socket
*sock
,
2227 struct socket
*other
, struct sock
*newsk
)
2229 struct inode
*sp
= SOCK_INODE(sock
);
2230 struct inode
*op
= SOCK_INODE(other
);
2232 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_READWRITE
);
2236 * smack_unix_may_send - Smack access on UDS
2238 * @other: the other socket
2240 * Return 0 if a subject with the smack of sock could access
2241 * an object with the smack of other, otherwise an error code
2243 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2245 struct inode
*sp
= SOCK_INODE(sock
);
2246 struct inode
*op
= SOCK_INODE(other
);
2248 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
);
2252 * smack_socket_sendmsg - Smack check based on destination host
2255 * @size: the size of the message
2257 * Return 0 if the current subject can write to the destination
2258 * host. This is only a question if the destination is a single
2261 static int smack_socket_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
2264 struct sockaddr_in
*sip
= (struct sockaddr_in
*) msg
->msg_name
;
2265 struct socket_smack
*ssp
= sock
->sk
->sk_security
;
2270 * Perfectly reasonable for this to be NULL
2272 if (sip
== NULL
|| sip
->sin_family
!= PF_INET
)
2275 hostsp
= smack_host_label(sip
);
2276 if (hostsp
== NULL
) {
2277 if (ssp
->smk_labeled
!= SMACK_CIPSO_SOCKET
)
2278 return smack_netlabel(sock
->sk
, SMACK_CIPSO_SOCKET
);
2282 rc
= smk_access(ssp
->smk_out
, hostsp
, MAY_WRITE
);
2286 if (ssp
->smk_labeled
!= SMACK_UNLABELED_SOCKET
)
2287 return smack_netlabel(sock
->sk
, SMACK_UNLABELED_SOCKET
);
2295 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2296 * @sap: netlabel secattr
2297 * @sip: where to put the result
2299 * Copies a smack label into sip
2301 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2303 char smack
[SMK_LABELLEN
];
2307 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) != 0) {
2309 * Looks like a CIPSO packet.
2310 * If there are flags but no level netlabel isn't
2311 * behaving the way we expect it to.
2313 * Get the categories, if any
2314 * Without guidance regarding the smack value
2315 * for the packet fall back on the network
2318 memset(smack
, '\0', SMK_LABELLEN
);
2319 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2321 pcat
= netlbl_secattr_catmap_walk(
2322 sap
->attr
.mls
.cat
, pcat
+ 1);
2325 smack_catset_bit(pcat
, smack
);
2328 * If it is CIPSO using smack direct mapping
2329 * we are already done. WeeHee.
2331 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2332 memcpy(sip
, smack
, SMK_MAXLEN
);
2336 * Look it up in the supplied table if it is not
2339 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2342 if ((sap
->flags
& NETLBL_SECATTR_SECID
) != 0) {
2344 * Looks like a fallback, which gives us a secid.
2346 sp
= smack_from_secid(sap
->attr
.secid
);
2348 * This has got to be a bug because it is
2349 * impossible to specify a fallback without
2350 * specifying the label, which will ensure
2351 * it has a secid, and the only way to get a
2352 * secid is from a fallback.
2355 strncpy(sip
, sp
, SMK_MAXLEN
);
2359 * Without guidance regarding the smack value
2360 * for the packet fall back on the network
2363 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2368 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2372 * Returns 0 if the packet should be delivered, an error code otherwise
2374 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2376 struct netlbl_lsm_secattr secattr
;
2377 struct socket_smack
*ssp
= sk
->sk_security
;
2378 char smack
[SMK_LABELLEN
];
2382 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2386 * Translate what netlabel gave us.
2388 netlbl_secattr_init(&secattr
);
2390 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2392 smack_from_secattr(&secattr
, smack
);
2395 csp
= smack_net_ambient
;
2397 netlbl_secattr_destroy(&secattr
);
2400 * Receiving a packet requires that the other end
2401 * be able to write here. Read access is not required.
2402 * This is the simplist possible security model
2405 rc
= smk_access(csp
, ssp
->smk_in
, MAY_WRITE
);
2407 netlbl_skbuff_err(skb
, rc
, 0);
2412 * smack_socket_getpeersec_stream - pull in packet label
2414 * @optval: user's destination
2415 * @optlen: size thereof
2418 * returns zero on success, an error code otherwise
2420 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2421 char __user
*optval
,
2422 int __user
*optlen
, unsigned len
)
2424 struct socket_smack
*ssp
;
2428 ssp
= sock
->sk
->sk_security
;
2429 slen
= strlen(ssp
->smk_packet
) + 1;
2433 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2436 if (put_user(slen
, optlen
) != 0)
2444 * smack_socket_getpeersec_dgram - pull in packet label
2447 * @secid: pointer to where to put the secid of the packet
2449 * Sets the netlabel socket state on sk from parent
2451 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2452 struct sk_buff
*skb
, u32
*secid
)
2455 struct netlbl_lsm_secattr secattr
;
2457 char smack
[SMK_LABELLEN
];
2458 int family
= PF_INET
;
2463 * Only works for families with packets.
2467 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2469 family
= sk
->sk_family
;
2472 * Translate what netlabel gave us.
2474 netlbl_secattr_init(&secattr
);
2475 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2477 smack_from_secattr(&secattr
, smack
);
2478 netlbl_secattr_destroy(&secattr
);
2481 * Give up if we couldn't get anything
2486 s
= smack_to_secid(smack
);
2495 * smack_sock_graft - graft access state between two sockets
2497 * @parent: donor socket
2499 * Sets the netlabel socket state on sk from parent
2501 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2503 struct socket_smack
*ssp
;
2509 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2512 ssp
= sk
->sk_security
;
2513 ssp
->smk_in
= ssp
->smk_out
= current_security();
2514 ssp
->smk_packet
[0] = '\0';
2516 rc
= smack_netlabel(sk
, SMACK_CIPSO_SOCKET
);
2518 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
2523 * smack_inet_conn_request - Smack access check on connect
2524 * @sk: socket involved
2528 * Returns 0 if a task with the packet label could write to
2529 * the socket, otherwise an error code
2531 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2532 struct request_sock
*req
)
2534 struct netlbl_lsm_secattr skb_secattr
;
2535 struct socket_smack
*ssp
= sk
->sk_security
;
2536 char smack
[SMK_LABELLEN
];
2542 netlbl_secattr_init(&skb_secattr
);
2543 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &skb_secattr
);
2545 smack_from_secattr(&skb_secattr
, smack
);
2547 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2548 netlbl_secattr_destroy(&skb_secattr
);
2550 * Receiving a packet requires that the other end
2551 * be able to write here. Read access is not required.
2553 * If the request is successful save the peer's label
2554 * so that SO_PEERCRED can report it.
2556 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2558 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2564 * Key management security hooks
2566 * Casey has not tested key support very heavily.
2567 * The permission check is most likely too restrictive.
2568 * If you care about keys please have a look.
2573 * smack_key_alloc - Set the key security blob
2575 * @cred: the credentials to use
2578 * No allocation required
2582 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
2583 unsigned long flags
)
2585 key
->security
= cred
->security
;
2590 * smack_key_free - Clear the key security blob
2593 * Clear the blob pointer
2595 static void smack_key_free(struct key
*key
)
2597 key
->security
= NULL
;
2601 * smack_key_permission - Smack access on a key
2602 * @key_ref: gets to the object
2603 * @cred: the credentials to use
2606 * Return 0 if the task has read and write to the object,
2607 * an error code otherwise
2609 static int smack_key_permission(key_ref_t key_ref
,
2610 const struct cred
*cred
, key_perm_t perm
)
2614 keyp
= key_ref_to_ptr(key_ref
);
2618 * If the key hasn't been initialized give it access so that
2621 if (keyp
->security
== NULL
)
2624 * This should not occur
2626 if (cred
->security
== NULL
)
2629 return smk_access(cred
->security
, keyp
->security
, MAY_READWRITE
);
2631 #endif /* CONFIG_KEYS */
2636 * Audit requires a unique representation of each Smack specific
2637 * rule. This unique representation is used to distinguish the
2638 * object to be audited from remaining kernel objects and also
2639 * works as a glue between the audit hooks.
2641 * Since repository entries are added but never deleted, we'll use
2642 * the smack_known label address related to the given audit rule as
2643 * the needed unique representation. This also better fits the smack
2644 * model where nearly everything is a label.
2649 * smack_audit_rule_init - Initialize a smack audit rule
2650 * @field: audit rule fields given from user-space (audit.h)
2651 * @op: required testing operator (=, !=, >, <, ...)
2652 * @rulestr: smack label to be audited
2653 * @vrule: pointer to save our own audit rule representation
2655 * Prepare to audit cases where (@field @op @rulestr) is true.
2656 * The label to be audited is created if necessay.
2658 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2660 char **rule
= (char **)vrule
;
2663 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2666 if (op
!= Audit_equal
&& op
!= Audit_not_equal
)
2669 *rule
= smk_import(rulestr
, 0);
2675 * smack_audit_rule_known - Distinguish Smack audit rules
2676 * @krule: rule of interest, in Audit kernel representation format
2678 * This is used to filter Smack rules from remaining Audit ones.
2679 * If it's proved that this rule belongs to us, the
2680 * audit_rule_match hook will be called to do the final judgement.
2682 static int smack_audit_rule_known(struct audit_krule
*krule
)
2684 struct audit_field
*f
;
2687 for (i
= 0; i
< krule
->field_count
; i
++) {
2688 f
= &krule
->fields
[i
];
2690 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2698 * smack_audit_rule_match - Audit given object ?
2699 * @secid: security id for identifying the object to test
2700 * @field: audit rule flags given from user-space
2701 * @op: required testing operator
2702 * @vrule: smack internal rule presentation
2703 * @actx: audit context associated with the check
2705 * The core Audit hook. It's used to take the decision of
2706 * whether to audit or not to audit a given object.
2708 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2709 struct audit_context
*actx
)
2715 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2716 "Smack: missing rule\n");
2720 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2723 smack
= smack_from_secid(secid
);
2726 * No need to do string comparisons. If a match occurs,
2727 * both pointers will point to the same smack_known
2730 if (op
== Audit_equal
)
2731 return (rule
== smack
);
2732 if (op
== Audit_not_equal
)
2733 return (rule
!= smack
);
2739 * smack_audit_rule_free - free smack rule representation
2740 * @vrule: rule to be freed.
2742 * No memory was allocated.
2744 static void smack_audit_rule_free(void *vrule
)
2749 #endif /* CONFIG_AUDIT */
2752 * smack_secid_to_secctx - return the smack label for a secid
2753 * @secid: incoming integer
2754 * @secdata: destination
2755 * @seclen: how long it is
2757 * Exists for networking code.
2759 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
2761 char *sp
= smack_from_secid(secid
);
2764 *seclen
= strlen(sp
);
2769 * smack_secctx_to_secid - return the secid for a smack label
2770 * @secdata: smack label
2771 * @seclen: how long result is
2772 * @secid: outgoing integer
2774 * Exists for audit and networking code.
2776 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
2778 *secid
= smack_to_secid(secdata
);
2783 * smack_release_secctx - don't do anything.
2787 * Exists to make sure nothing gets done, and properly
2789 static void smack_release_secctx(char *secdata
, u32 seclen
)
2793 struct security_operations smack_ops
= {
2796 .ptrace_may_access
= smack_ptrace_may_access
,
2797 .ptrace_traceme
= smack_ptrace_traceme
,
2798 .capget
= cap_capget
,
2799 .capset
= cap_capset
,
2800 .capable
= cap_capable
,
2801 .syslog
= smack_syslog
,
2802 .settime
= cap_settime
,
2803 .vm_enough_memory
= cap_vm_enough_memory
,
2805 .bprm_set_creds
= cap_bprm_set_creds
,
2806 .bprm_secureexec
= cap_bprm_secureexec
,
2808 .sb_alloc_security
= smack_sb_alloc_security
,
2809 .sb_free_security
= smack_sb_free_security
,
2810 .sb_copy_data
= smack_sb_copy_data
,
2811 .sb_kern_mount
= smack_sb_kern_mount
,
2812 .sb_statfs
= smack_sb_statfs
,
2813 .sb_mount
= smack_sb_mount
,
2814 .sb_umount
= smack_sb_umount
,
2816 .inode_alloc_security
= smack_inode_alloc_security
,
2817 .inode_free_security
= smack_inode_free_security
,
2818 .inode_init_security
= smack_inode_init_security
,
2819 .inode_link
= smack_inode_link
,
2820 .inode_unlink
= smack_inode_unlink
,
2821 .inode_rmdir
= smack_inode_rmdir
,
2822 .inode_rename
= smack_inode_rename
,
2823 .inode_permission
= smack_inode_permission
,
2824 .inode_setattr
= smack_inode_setattr
,
2825 .inode_getattr
= smack_inode_getattr
,
2826 .inode_setxattr
= smack_inode_setxattr
,
2827 .inode_post_setxattr
= smack_inode_post_setxattr
,
2828 .inode_getxattr
= smack_inode_getxattr
,
2829 .inode_removexattr
= smack_inode_removexattr
,
2830 .inode_need_killpriv
= cap_inode_need_killpriv
,
2831 .inode_killpriv
= cap_inode_killpriv
,
2832 .inode_getsecurity
= smack_inode_getsecurity
,
2833 .inode_setsecurity
= smack_inode_setsecurity
,
2834 .inode_listsecurity
= smack_inode_listsecurity
,
2835 .inode_getsecid
= smack_inode_getsecid
,
2837 .file_permission
= smack_file_permission
,
2838 .file_alloc_security
= smack_file_alloc_security
,
2839 .file_free_security
= smack_file_free_security
,
2840 .file_ioctl
= smack_file_ioctl
,
2841 .file_lock
= smack_file_lock
,
2842 .file_fcntl
= smack_file_fcntl
,
2843 .file_set_fowner
= smack_file_set_fowner
,
2844 .file_send_sigiotask
= smack_file_send_sigiotask
,
2845 .file_receive
= smack_file_receive
,
2847 .cred_free
= smack_cred_free
,
2848 .cred_prepare
= smack_cred_prepare
,
2849 .cred_commit
= smack_cred_commit
,
2850 .kernel_act_as
= smack_kernel_act_as
,
2851 .kernel_create_files_as
= smack_kernel_create_files_as
,
2852 .task_fix_setuid
= cap_task_fix_setuid
,
2853 .task_setpgid
= smack_task_setpgid
,
2854 .task_getpgid
= smack_task_getpgid
,
2855 .task_getsid
= smack_task_getsid
,
2856 .task_getsecid
= smack_task_getsecid
,
2857 .task_setnice
= smack_task_setnice
,
2858 .task_setioprio
= smack_task_setioprio
,
2859 .task_getioprio
= smack_task_getioprio
,
2860 .task_setscheduler
= smack_task_setscheduler
,
2861 .task_getscheduler
= smack_task_getscheduler
,
2862 .task_movememory
= smack_task_movememory
,
2863 .task_kill
= smack_task_kill
,
2864 .task_wait
= smack_task_wait
,
2865 .task_to_inode
= smack_task_to_inode
,
2866 .task_prctl
= cap_task_prctl
,
2868 .ipc_permission
= smack_ipc_permission
,
2869 .ipc_getsecid
= smack_ipc_getsecid
,
2871 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
2872 .msg_msg_free_security
= smack_msg_msg_free_security
,
2874 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
2875 .msg_queue_free_security
= smack_msg_queue_free_security
,
2876 .msg_queue_associate
= smack_msg_queue_associate
,
2877 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
2878 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
2879 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
2881 .shm_alloc_security
= smack_shm_alloc_security
,
2882 .shm_free_security
= smack_shm_free_security
,
2883 .shm_associate
= smack_shm_associate
,
2884 .shm_shmctl
= smack_shm_shmctl
,
2885 .shm_shmat
= smack_shm_shmat
,
2887 .sem_alloc_security
= smack_sem_alloc_security
,
2888 .sem_free_security
= smack_sem_free_security
,
2889 .sem_associate
= smack_sem_associate
,
2890 .sem_semctl
= smack_sem_semctl
,
2891 .sem_semop
= smack_sem_semop
,
2893 .netlink_send
= cap_netlink_send
,
2894 .netlink_recv
= cap_netlink_recv
,
2896 .d_instantiate
= smack_d_instantiate
,
2898 .getprocattr
= smack_getprocattr
,
2899 .setprocattr
= smack_setprocattr
,
2901 .unix_stream_connect
= smack_unix_stream_connect
,
2902 .unix_may_send
= smack_unix_may_send
,
2904 .socket_post_create
= smack_socket_post_create
,
2905 .socket_connect
= smack_socket_connect
,
2906 .socket_sendmsg
= smack_socket_sendmsg
,
2907 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
2908 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
2909 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
2910 .sk_alloc_security
= smack_sk_alloc_security
,
2911 .sk_free_security
= smack_sk_free_security
,
2912 .sock_graft
= smack_sock_graft
,
2913 .inet_conn_request
= smack_inet_conn_request
,
2915 /* key management security hooks */
2917 .key_alloc
= smack_key_alloc
,
2918 .key_free
= smack_key_free
,
2919 .key_permission
= smack_key_permission
,
2920 #endif /* CONFIG_KEYS */
2924 .audit_rule_init
= smack_audit_rule_init
,
2925 .audit_rule_known
= smack_audit_rule_known
,
2926 .audit_rule_match
= smack_audit_rule_match
,
2927 .audit_rule_free
= smack_audit_rule_free
,
2928 #endif /* CONFIG_AUDIT */
2930 .secid_to_secctx
= smack_secid_to_secctx
,
2931 .secctx_to_secid
= smack_secctx_to_secid
,
2932 .release_secctx
= smack_release_secctx
,
2936 static __init
void init_smack_know_list(void)
2938 list_add(&smack_known_huh
.list
, &smack_known_list
);
2939 list_add(&smack_known_hat
.list
, &smack_known_list
);
2940 list_add(&smack_known_star
.list
, &smack_known_list
);
2941 list_add(&smack_known_floor
.list
, &smack_known_list
);
2942 list_add(&smack_known_invalid
.list
, &smack_known_list
);
2943 list_add(&smack_known_web
.list
, &smack_known_list
);
2947 * smack_init - initialize the smack system
2951 static __init
int smack_init(void)
2955 if (!security_module_enable(&smack_ops
))
2958 printk(KERN_INFO
"Smack: Initializing.\n");
2961 * Set the security state for the initial task.
2963 cred
= (struct cred
*) current
->cred
;
2964 cred
->security
= &smack_known_floor
.smk_known
;
2966 /* initilize the smack_know_list */
2967 init_smack_know_list();
2971 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
2972 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
2973 spin_lock_init(&smack_known_star
.smk_cipsolock
);
2974 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
2975 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
2980 if (register_security(&smack_ops
))
2981 panic("smack: Unable to register with kernel.\n");
2987 * Smack requires early initialization in order to label
2988 * all processes and objects when they are created.
2990 security_initcall(smack_init
);