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>
34 * I hope these are the hokeyist lines of code in the module. Casey.
36 #define DEVPTS_SUPER_MAGIC 0x1cd1
37 #define SOCKFS_MAGIC 0x534F434B
38 #define TMPFS_MAGIC 0x01021994
41 * smk_fetch - Fetch the smack label from a file.
42 * @ip: a pointer to the inode
43 * @dp: a pointer to the dentry
45 * Returns a pointer to the master list entry for the Smack label
46 * or NULL if there was no label to fetch.
48 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
51 char in
[SMK_LABELLEN
];
53 if (ip
->i_op
->getxattr
== NULL
)
56 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
60 return smk_import(in
, rc
);
64 * new_inode_smack - allocate an inode security blob
65 * @smack: a pointer to the Smack label to use in the blob
67 * Returns the new blob or NULL if there's no memory available
69 struct inode_smack
*new_inode_smack(char *smack
)
71 struct inode_smack
*isp
;
73 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
77 isp
->smk_inode
= smack
;
79 mutex_init(&isp
->smk_lock
);
90 * smack_ptrace - Smack approval on ptrace
91 * @ptp: parent task pointer
92 * @ctp: child task pointer
94 * Returns 0 if access is OK, an error code otherwise
96 * Do the capability checks, and require read and write.
98 static int smack_ptrace(struct task_struct
*ptp
, struct task_struct
*ctp
)
102 rc
= cap_ptrace(ptp
, ctp
);
106 rc
= smk_access(ptp
->security
, ctp
->security
, MAY_READWRITE
);
107 if (rc
!= 0 && __capable(ptp
, CAP_MAC_OVERRIDE
))
114 * smack_syslog - Smack approval on syslog
115 * @type: message type
117 * Require that the task has the floor label
119 * Returns 0 on success, error code otherwise.
121 static int smack_syslog(int type
)
124 char *sp
= current
->security
;
126 rc
= cap_syslog(type
);
130 if (capable(CAP_MAC_OVERRIDE
))
133 if (sp
!= smack_known_floor
.smk_known
)
145 * smack_sb_alloc_security - allocate a superblock blob
146 * @sb: the superblock getting the blob
148 * Returns 0 on success or -ENOMEM on error.
150 static int smack_sb_alloc_security(struct super_block
*sb
)
152 struct superblock_smack
*sbsp
;
154 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
159 sbsp
->smk_root
= smack_known_floor
.smk_known
;
160 sbsp
->smk_default
= smack_known_floor
.smk_known
;
161 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
162 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
163 sbsp
->smk_initialized
= 0;
164 spin_lock_init(&sbsp
->smk_sblock
);
166 sb
->s_security
= sbsp
;
172 * smack_sb_free_security - free a superblock blob
173 * @sb: the superblock getting the blob
176 static void smack_sb_free_security(struct super_block
*sb
)
178 kfree(sb
->s_security
);
179 sb
->s_security
= NULL
;
183 * smack_sb_copy_data - copy mount options data for processing
184 * @type: file system type
185 * @orig: where to start
188 * Returns 0 on success or -ENOMEM on error.
190 * Copy the Smack specific mount options out of the mount
193 static int smack_sb_copy_data(char *orig
, char *smackopts
)
195 char *cp
, *commap
, *otheropts
, *dp
;
197 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
198 if (otheropts
== NULL
)
201 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
202 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
204 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
206 else if (strstr(cp
, SMK_FSHAT
) == cp
)
208 else if (strstr(cp
, SMK_FSROOT
) == cp
)
213 commap
= strchr(cp
, ',');
222 strcpy(orig
, otheropts
);
223 free_page((unsigned long)otheropts
);
229 * smack_sb_kern_mount - Smack specific mount processing
230 * @sb: the file system superblock
231 * @data: the smack mount options
233 * Returns 0 on success, an error code on failure
235 static int smack_sb_kern_mount(struct super_block
*sb
, void *data
)
237 struct dentry
*root
= sb
->s_root
;
238 struct inode
*inode
= root
->d_inode
;
239 struct superblock_smack
*sp
= sb
->s_security
;
240 struct inode_smack
*isp
;
245 spin_lock(&sp
->smk_sblock
);
246 if (sp
->smk_initialized
!= 0) {
247 spin_unlock(&sp
->smk_sblock
);
250 sp
->smk_initialized
= 1;
251 spin_unlock(&sp
->smk_sblock
);
253 for (op
= data
; op
!= NULL
; op
= commap
) {
254 commap
= strchr(op
, ',');
258 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
259 op
+= strlen(SMK_FSHAT
);
260 nsp
= smk_import(op
, 0);
263 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
264 op
+= strlen(SMK_FSFLOOR
);
265 nsp
= smk_import(op
, 0);
268 } else if (strncmp(op
, SMK_FSDEFAULT
,
269 strlen(SMK_FSDEFAULT
)) == 0) {
270 op
+= strlen(SMK_FSDEFAULT
);
271 nsp
= smk_import(op
, 0);
273 sp
->smk_default
= nsp
;
274 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
275 op
+= strlen(SMK_FSROOT
);
276 nsp
= smk_import(op
, 0);
283 * Initialize the root inode.
285 isp
= inode
->i_security
;
287 inode
->i_security
= new_inode_smack(sp
->smk_root
);
289 isp
->smk_inode
= sp
->smk_root
;
295 * smack_sb_statfs - Smack check on statfs
296 * @dentry: identifies the file system in question
298 * Returns 0 if current can read the floor of the filesystem,
299 * and error code otherwise
301 static int smack_sb_statfs(struct dentry
*dentry
)
303 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
305 return smk_curacc(sbp
->smk_floor
, MAY_READ
);
309 * smack_sb_mount - Smack check for mounting
316 * Returns 0 if current can write the floor of the filesystem
317 * being mounted on, an error code otherwise.
319 static int smack_sb_mount(char *dev_name
, struct path
*path
,
320 char *type
, unsigned long flags
, void *data
)
322 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
324 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
328 * smack_sb_umount - Smack check for unmounting
329 * @mnt: file system to unmount
332 * Returns 0 if current can write the floor of the filesystem
333 * being unmounted, an error code otherwise.
335 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
337 struct superblock_smack
*sbp
;
339 sbp
= mnt
->mnt_sb
->s_security
;
341 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
349 * smack_inode_alloc_security - allocate an inode blob
350 * @inode - the inode in need of a blob
352 * Returns 0 if it gets a blob, -ENOMEM otherwise
354 static int smack_inode_alloc_security(struct inode
*inode
)
356 inode
->i_security
= new_inode_smack(current
->security
);
357 if (inode
->i_security
== NULL
)
363 * smack_inode_free_security - free an inode blob
364 * @inode - the inode with a blob
366 * Clears the blob pointer in inode
368 static void smack_inode_free_security(struct inode
*inode
)
370 kfree(inode
->i_security
);
371 inode
->i_security
= NULL
;
375 * smack_inode_init_security - copy out the smack from an inode
378 * @name: where to put the attribute name
379 * @value: where to put the attribute value
380 * @len: where to put the length of the attribute
382 * Returns 0 if it all works out, -ENOMEM if there's no memory
384 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
385 char **name
, void **value
, size_t *len
)
387 char *isp
= smk_of_inode(inode
);
390 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
396 *value
= kstrdup(isp
, GFP_KERNEL
);
402 *len
= strlen(isp
) + 1;
408 * smack_inode_link - Smack check on link
409 * @old_dentry: the existing object
411 * @new_dentry: the new object
413 * Returns 0 if access is permitted, an error code otherwise
415 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
416 struct dentry
*new_dentry
)
421 isp
= smk_of_inode(old_dentry
->d_inode
);
422 rc
= smk_curacc(isp
, MAY_WRITE
);
424 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
425 isp
= smk_of_inode(new_dentry
->d_inode
);
426 rc
= smk_curacc(isp
, MAY_WRITE
);
433 * smack_inode_unlink - Smack check on inode deletion
434 * @dir: containing directory object
435 * @dentry: file to unlink
437 * Returns 0 if current can write the containing directory
438 * and the object, error code otherwise
440 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
442 struct inode
*ip
= dentry
->d_inode
;
446 * You need write access to the thing you're unlinking
448 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
);
451 * You also need write access to the containing directory
453 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
459 * smack_inode_rmdir - Smack check on directory deletion
460 * @dir: containing directory object
461 * @dentry: directory to unlink
463 * Returns 0 if current can write the containing directory
464 * and the directory, error code otherwise
466 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
471 * You need write access to the thing you're removing
473 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
476 * You also need write access to the containing directory
478 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
484 * smack_inode_rename - Smack check on rename
485 * @old_inode: the old directory
486 * @old_dentry: unused
487 * @new_inode: the new directory
488 * @new_dentry: unused
490 * Read and write access is required on both the old and
493 * Returns 0 if access is permitted, an error code otherwise
495 static int smack_inode_rename(struct inode
*old_inode
,
496 struct dentry
*old_dentry
,
497 struct inode
*new_inode
,
498 struct dentry
*new_dentry
)
503 isp
= smk_of_inode(old_dentry
->d_inode
);
504 rc
= smk_curacc(isp
, MAY_READWRITE
);
506 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
507 isp
= smk_of_inode(new_dentry
->d_inode
);
508 rc
= smk_curacc(isp
, MAY_READWRITE
);
515 * smack_inode_permission - Smack version of permission()
516 * @inode: the inode in question
517 * @mask: the access requested
520 * This is the important Smack hook.
522 * Returns 0 if access is permitted, -EACCES otherwise
524 static int smack_inode_permission(struct inode
*inode
, int mask
,
525 struct nameidata
*nd
)
528 * No permission to check. Existence test. Yup, it's there.
533 return smk_curacc(smk_of_inode(inode
), mask
);
537 * smack_inode_setattr - Smack check for setting attributes
538 * @dentry: the object
539 * @iattr: for the force flag
541 * Returns 0 if access is permitted, an error code otherwise
543 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
546 * Need to allow for clearing the setuid bit.
548 if (iattr
->ia_valid
& ATTR_FORCE
)
551 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
555 * smack_inode_getattr - Smack check for getting attributes
557 * @dentry: the object
559 * Returns 0 if access is permitted, an error code otherwise
561 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
563 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
567 * smack_inode_setxattr - Smack check for setting xattrs
568 * @dentry: the object
569 * @name: name of the attribute
574 * This protects the Smack attribute explicitly.
576 * Returns 0 if access is permitted, an error code otherwise
578 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
579 const void *value
, size_t size
, int flags
)
583 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
584 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
585 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
586 if (!capable(CAP_MAC_ADMIN
))
589 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
592 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
598 * smack_inode_post_setxattr - Apply the Smack update approved above
600 * @name: attribute name
601 * @value: attribute value
602 * @size: attribute size
605 * Set the pointer in the inode blob to the entry found
606 * in the master label list.
608 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
609 const void *value
, size_t size
, int flags
)
611 struct inode_smack
*isp
;
617 if (strcmp(name
, XATTR_NAME_SMACK
))
620 if (size
>= SMK_LABELLEN
)
623 isp
= dentry
->d_inode
->i_security
;
626 * No locking is done here. This is a pointer
629 nsp
= smk_import(value
, size
);
631 isp
->smk_inode
= nsp
;
633 isp
->smk_inode
= smack_known_invalid
.smk_known
;
639 * smack_inode_getxattr - Smack check on getxattr
640 * @dentry: the object
643 * Returns 0 if access is permitted, an error code otherwise
645 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
647 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
651 * smack_inode_removexattr - Smack check on removexattr
652 * @dentry: the object
653 * @name: name of the attribute
655 * Removing the Smack attribute requires CAP_MAC_ADMIN
657 * Returns 0 if access is permitted, an error code otherwise
659 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
663 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
664 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
665 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
666 if (!capable(CAP_MAC_ADMIN
))
669 rc
= cap_inode_removexattr(dentry
, name
);
672 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
678 * smack_inode_getsecurity - get smack xattrs
680 * @name: attribute name
681 * @buffer: where to put the result
682 * @size: size of the buffer
685 * Returns the size of the attribute or an error code
687 static int smack_inode_getsecurity(const struct inode
*inode
,
688 const char *name
, void **buffer
,
691 struct socket_smack
*ssp
;
693 struct super_block
*sbp
;
694 struct inode
*ip
= (struct inode
*)inode
;
699 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
700 isp
= smk_of_inode(inode
);
701 ilen
= strlen(isp
) + 1;
707 * The rest of the Smack xattrs are only on sockets.
710 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
714 if (sock
== NULL
|| sock
->sk
== NULL
)
717 ssp
= sock
->sk
->sk_security
;
719 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
721 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
726 ilen
= strlen(isp
) + 1;
737 * smack_inode_listsecurity - list the Smack attributes
739 * @buffer: where they go
740 * @buffer_size: size of buffer
742 * Returns 0 on success, -EINVAL otherwise
744 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
747 int len
= strlen(XATTR_NAME_SMACK
);
749 if (buffer
!= NULL
&& len
<= buffer_size
) {
750 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
757 * smack_inode_getsecid - Extract inode's security id
758 * @inode: inode to extract the info from
759 * @secid: where result will be saved
761 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
763 struct inode_smack
*isp
= inode
->i_security
;
765 *secid
= smack_to_secid(isp
->smk_inode
);
773 * smack_file_permission - Smack check on file operations
779 * Should access checks be done on each read or write?
780 * UNICOS and SELinux say yes.
781 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
783 * I'll say no for now. Smack does not do the frequent
784 * label changing that SELinux does.
786 static int smack_file_permission(struct file
*file
, int mask
)
792 * smack_file_alloc_security - assign a file security blob
795 * The security blob for a file is a pointer to the master
796 * label list, so no allocation is done.
800 static int smack_file_alloc_security(struct file
*file
)
802 file
->f_security
= current
->security
;
807 * smack_file_free_security - clear a file security blob
810 * The security blob for a file is a pointer to the master
811 * label list, so no memory is freed.
813 static void smack_file_free_security(struct file
*file
)
815 file
->f_security
= NULL
;
819 * smack_file_ioctl - Smack check on ioctls
824 * Relies heavily on the correct use of the ioctl command conventions.
826 * Returns 0 if allowed, error code otherwise
828 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
833 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
834 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
836 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
837 rc
= smk_curacc(file
->f_security
, MAY_READ
);
843 * smack_file_lock - Smack check on file locking
847 * Returns 0 if current has write access, error code otherwise
849 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
851 return smk_curacc(file
->f_security
, MAY_WRITE
);
855 * smack_file_fcntl - Smack check on fcntl
857 * @cmd: what action to check
860 * Returns 0 if current has access, error code otherwise
862 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
874 rc
= smk_curacc(file
->f_security
, MAY_READ
);
882 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
885 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
);
892 * smack_file_set_fowner - set the file security blob value
893 * @file: object in question
896 * Further research may be required on this one.
898 static int smack_file_set_fowner(struct file
*file
)
900 file
->f_security
= current
->security
;
905 * smack_file_send_sigiotask - Smack on sigio
906 * @tsk: The target task
907 * @fown: the object the signal come from
910 * Allow a privileged task to get signals even if it shouldn't
912 * Returns 0 if a subject with the object's smack could
913 * write to the task, an error code otherwise.
915 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
916 struct fown_struct
*fown
, int signum
)
922 * struct fown_struct is never outside the context of a struct file
924 file
= container_of(fown
, struct file
, f_owner
);
925 rc
= smk_access(file
->f_security
, tsk
->security
, MAY_WRITE
);
926 if (rc
!= 0 && __capable(tsk
, CAP_MAC_OVERRIDE
))
932 * smack_file_receive - Smack file receive check
935 * Returns 0 if current has access, error code otherwise
937 static int smack_file_receive(struct file
*file
)
942 * This code relies on bitmasks.
944 if (file
->f_mode
& FMODE_READ
)
946 if (file
->f_mode
& FMODE_WRITE
)
949 return smk_curacc(file
->f_security
, may
);
957 * smack_task_alloc_security - "allocate" a task blob
958 * @tsk: the task in need of a blob
960 * Smack isn't using copies of blobs. Everyone
961 * points to an immutable list. No alloc required.
962 * No data copy required.
966 static int smack_task_alloc_security(struct task_struct
*tsk
)
968 tsk
->security
= current
->security
;
974 * smack_task_free_security - "free" a task blob
975 * @task: the task with the blob
977 * Smack isn't using copies of blobs. Everyone
978 * points to an immutable list. The blobs never go away.
979 * There is no leak here.
981 static void smack_task_free_security(struct task_struct
*task
)
983 task
->security
= NULL
;
987 * smack_task_setpgid - Smack check on setting pgid
988 * @p: the task object
991 * Return 0 if write access is permitted
993 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
995 return smk_curacc(p
->security
, MAY_WRITE
);
999 * smack_task_getpgid - Smack access check for getpgid
1000 * @p: the object task
1002 * Returns 0 if current can read the object task, error code otherwise
1004 static int smack_task_getpgid(struct task_struct
*p
)
1006 return smk_curacc(p
->security
, MAY_READ
);
1010 * smack_task_getsid - Smack access check for getsid
1011 * @p: the object task
1013 * Returns 0 if current can read the object task, error code otherwise
1015 static int smack_task_getsid(struct task_struct
*p
)
1017 return smk_curacc(p
->security
, MAY_READ
);
1021 * smack_task_getsecid - get the secid of the task
1022 * @p: the object task
1023 * @secid: where to put the result
1025 * Sets the secid to contain a u32 version of the smack label.
1027 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1029 *secid
= smack_to_secid(p
->security
);
1033 * smack_task_setnice - Smack check on setting nice
1034 * @p: the task object
1037 * Return 0 if write access is permitted
1039 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1043 rc
= cap_task_setnice(p
, nice
);
1045 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1050 * smack_task_setioprio - Smack check on setting ioprio
1051 * @p: the task object
1054 * Return 0 if write access is permitted
1056 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1060 rc
= cap_task_setioprio(p
, ioprio
);
1062 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1067 * smack_task_getioprio - Smack check on reading ioprio
1068 * @p: the task object
1070 * Return 0 if read access is permitted
1072 static int smack_task_getioprio(struct task_struct
*p
)
1074 return smk_curacc(p
->security
, MAY_READ
);
1078 * smack_task_setscheduler - Smack check on setting scheduler
1079 * @p: the task object
1083 * Return 0 if read access is permitted
1085 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1086 struct sched_param
*lp
)
1090 rc
= cap_task_setscheduler(p
, policy
, lp
);
1092 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1097 * smack_task_getscheduler - Smack check on reading scheduler
1098 * @p: the task object
1100 * Return 0 if read access is permitted
1102 static int smack_task_getscheduler(struct task_struct
*p
)
1104 return smk_curacc(p
->security
, MAY_READ
);
1108 * smack_task_movememory - Smack check on moving memory
1109 * @p: the task object
1111 * Return 0 if write access is permitted
1113 static int smack_task_movememory(struct task_struct
*p
)
1115 return smk_curacc(p
->security
, MAY_WRITE
);
1119 * smack_task_kill - Smack check on signal delivery
1120 * @p: the task object
1123 * @secid: identifies the smack to use in lieu of current's
1125 * Return 0 if write access is permitted
1127 * The secid behavior is an artifact of an SELinux hack
1128 * in the USB code. Someday it may go away.
1130 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1134 * Sending a signal requires that the sender
1135 * can write the receiver.
1138 return smk_curacc(p
->security
, MAY_WRITE
);
1140 * If the secid isn't 0 we're dealing with some USB IO
1141 * specific behavior. This is not clean. For one thing
1142 * we can't take privilege into account.
1144 return smk_access(smack_from_secid(secid
), p
->security
, MAY_WRITE
);
1148 * smack_task_wait - Smack access check for waiting
1149 * @p: task to wait for
1151 * Returns 0 if current can wait for p, error code otherwise
1153 static int smack_task_wait(struct task_struct
*p
)
1157 rc
= smk_access(current
->security
, p
->security
, MAY_WRITE
);
1162 * Allow the operation to succeed if either task
1163 * has privilege to perform operations that might
1164 * account for the smack labels having gotten to
1165 * be different in the first place.
1167 * This breaks the strict subjet/object access
1168 * control ideal, taking the object's privilege
1169 * state into account in the decision as well as
1172 if (capable(CAP_MAC_OVERRIDE
) || __capable(p
, CAP_MAC_OVERRIDE
))
1179 * smack_task_to_inode - copy task smack into the inode blob
1180 * @p: task to copy from
1181 * inode: inode to copy to
1183 * Sets the smack pointer in the inode security blob
1185 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1187 struct inode_smack
*isp
= inode
->i_security
;
1188 isp
->smk_inode
= p
->security
;
1196 * smack_sk_alloc_security - Allocate a socket blob
1199 * @priority: memory allocation priority
1201 * Assign Smack pointers to current
1203 * Returns 0 on success, -ENOMEM is there's no memory
1205 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1207 char *csp
= current
->security
;
1208 struct socket_smack
*ssp
;
1210 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1216 ssp
->smk_packet
[0] = '\0';
1218 sk
->sk_security
= ssp
;
1224 * smack_sk_free_security - Free a socket blob
1227 * Clears the blob pointer
1229 static void smack_sk_free_security(struct sock
*sk
)
1231 kfree(sk
->sk_security
);
1235 * smack_set_catset - convert a capset to netlabel mls categories
1236 * @catset: the Smack categories
1237 * @sap: where to put the netlabel categories
1239 * Allocates and fills attr.mls.cat
1241 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1252 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1253 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1254 sap
->attr
.mls
.cat
->startbit
= 0;
1256 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1257 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1260 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1266 * smack_to_secattr - fill a secattr from a smack value
1267 * @smack: the smack value
1268 * @nlsp: where the result goes
1270 * Casey says that CIPSO is good enough for now.
1271 * It can be used to effect.
1272 * It can also be abused to effect when necessary.
1273 * Appologies to the TSIG group in general and GW in particular.
1275 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1277 struct smack_cipso cipso
;
1280 switch (smack_net_nltype
) {
1281 case NETLBL_NLTYPE_CIPSOV4
:
1282 nlsp
->domain
= smack
;
1283 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1285 rc
= smack_to_cipso(smack
, &cipso
);
1287 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1288 smack_set_catset(cipso
.smk_catset
, nlsp
);
1290 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1291 smack_set_catset(smack
, nlsp
);
1300 * smack_netlabel - Set the secattr on a socket
1303 * Convert the outbound smack value (smk_out) to a
1304 * secattr and attach it to the socket.
1306 * Returns 0 on success or an error code
1308 static int smack_netlabel(struct sock
*sk
)
1310 struct socket_smack
*ssp
;
1311 struct netlbl_lsm_secattr secattr
;
1314 ssp
= sk
->sk_security
;
1315 netlbl_secattr_init(&secattr
);
1316 smack_to_secattr(ssp
->smk_out
, &secattr
);
1317 rc
= netlbl_sock_setattr(sk
, &secattr
);
1318 netlbl_secattr_destroy(&secattr
);
1324 * smack_inode_setsecurity - set smack xattrs
1325 * @inode: the object
1326 * @name: attribute name
1327 * @value: attribute value
1328 * @size: size of the attribute
1331 * Sets the named attribute in the appropriate blob
1333 * Returns 0 on success, or an error code
1335 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1336 const void *value
, size_t size
, int flags
)
1339 struct inode_smack
*nsp
= inode
->i_security
;
1340 struct socket_smack
*ssp
;
1341 struct socket
*sock
;
1344 if (value
== NULL
|| size
> SMK_LABELLEN
)
1347 sp
= smk_import(value
, size
);
1351 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1352 nsp
->smk_inode
= sp
;
1356 * The rest of the Smack xattrs are only on sockets.
1358 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1361 sock
= SOCKET_I(inode
);
1362 if (sock
== NULL
|| sock
->sk
== NULL
)
1365 ssp
= sock
->sk
->sk_security
;
1367 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1369 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1371 rc
= smack_netlabel(sock
->sk
);
1373 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1382 * smack_socket_post_create - finish socket setup
1384 * @family: protocol family
1389 * Sets the netlabel information on the socket
1391 * Returns 0 on success, and error code otherwise
1393 static int smack_socket_post_create(struct socket
*sock
, int family
,
1394 int type
, int protocol
, int kern
)
1396 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1399 * Set the outbound netlbl.
1401 return smack_netlabel(sock
->sk
);
1405 * smack_flags_to_may - convert S_ to MAY_ values
1406 * @flags: the S_ value
1408 * Returns the equivalent MAY_ value
1410 static int smack_flags_to_may(int flags
)
1414 if (flags
& S_IRUGO
)
1416 if (flags
& S_IWUGO
)
1418 if (flags
& S_IXUGO
)
1425 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1430 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1432 msg
->security
= current
->security
;
1437 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1440 * Clears the blob pointer
1442 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1444 msg
->security
= NULL
;
1448 * smack_of_shm - the smack pointer for the shm
1451 * Returns a pointer to the smack value
1453 static char *smack_of_shm(struct shmid_kernel
*shp
)
1455 return (char *)shp
->shm_perm
.security
;
1459 * smack_shm_alloc_security - Set the security blob for shm
1464 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1466 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1468 isp
->security
= current
->security
;
1473 * smack_shm_free_security - Clear the security blob for shm
1476 * Clears the blob pointer
1478 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1480 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1482 isp
->security
= NULL
;
1486 * smack_shm_associate - Smack access check for shm
1488 * @shmflg: access requested
1490 * Returns 0 if current has the requested access, error code otherwise
1492 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1494 char *ssp
= smack_of_shm(shp
);
1497 may
= smack_flags_to_may(shmflg
);
1498 return smk_curacc(ssp
, may
);
1502 * smack_shm_shmctl - Smack access check for shm
1504 * @cmd: what it wants to do
1506 * Returns 0 if current has the requested access, error code otherwise
1508 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1522 may
= MAY_READWRITE
;
1527 * System level information.
1534 ssp
= smack_of_shm(shp
);
1535 return smk_curacc(ssp
, may
);
1539 * smack_shm_shmat - Smack access for shmat
1542 * @shmflg: access requested
1544 * Returns 0 if current has the requested access, error code otherwise
1546 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1549 char *ssp
= smack_of_shm(shp
);
1552 may
= smack_flags_to_may(shmflg
);
1553 return smk_curacc(ssp
, may
);
1557 * smack_of_sem - the smack pointer for the sem
1560 * Returns a pointer to the smack value
1562 static char *smack_of_sem(struct sem_array
*sma
)
1564 return (char *)sma
->sem_perm
.security
;
1568 * smack_sem_alloc_security - Set the security blob for sem
1573 static int smack_sem_alloc_security(struct sem_array
*sma
)
1575 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1577 isp
->security
= current
->security
;
1582 * smack_sem_free_security - Clear the security blob for sem
1585 * Clears the blob pointer
1587 static void smack_sem_free_security(struct sem_array
*sma
)
1589 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1591 isp
->security
= NULL
;
1595 * smack_sem_associate - Smack access check for sem
1597 * @semflg: access requested
1599 * Returns 0 if current has the requested access, error code otherwise
1601 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1603 char *ssp
= smack_of_sem(sma
);
1606 may
= smack_flags_to_may(semflg
);
1607 return smk_curacc(ssp
, may
);
1611 * smack_sem_shmctl - Smack access check for sem
1613 * @cmd: what it wants to do
1615 * Returns 0 if current has the requested access, error code otherwise
1617 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1636 may
= MAY_READWRITE
;
1641 * System level information
1648 ssp
= smack_of_sem(sma
);
1649 return smk_curacc(ssp
, may
);
1653 * smack_sem_semop - Smack checks of semaphore operations
1659 * Treated as read and write in all cases.
1661 * Returns 0 if access is allowed, error code otherwise
1663 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
1664 unsigned nsops
, int alter
)
1666 char *ssp
= smack_of_sem(sma
);
1668 return smk_curacc(ssp
, MAY_READWRITE
);
1672 * smack_msg_alloc_security - Set the security blob for msg
1677 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
1679 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1681 kisp
->security
= current
->security
;
1686 * smack_msg_free_security - Clear the security blob for msg
1689 * Clears the blob pointer
1691 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
1693 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1695 kisp
->security
= NULL
;
1699 * smack_of_msq - the smack pointer for the msq
1702 * Returns a pointer to the smack value
1704 static char *smack_of_msq(struct msg_queue
*msq
)
1706 return (char *)msq
->q_perm
.security
;
1710 * smack_msg_queue_associate - Smack access check for msg_queue
1712 * @msqflg: access requested
1714 * Returns 0 if current has the requested access, error code otherwise
1716 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
1718 char *msp
= smack_of_msq(msq
);
1721 may
= smack_flags_to_may(msqflg
);
1722 return smk_curacc(msp
, may
);
1726 * smack_msg_queue_msgctl - Smack access check for msg_queue
1728 * @cmd: what it wants to do
1730 * Returns 0 if current has the requested access, error code otherwise
1732 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
1744 may
= MAY_READWRITE
;
1749 * System level information
1756 msp
= smack_of_msq(msq
);
1757 return smk_curacc(msp
, may
);
1761 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1764 * @msqflg: access requested
1766 * Returns 0 if current has the requested access, error code otherwise
1768 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
1771 char *msp
= smack_of_msq(msq
);
1774 rc
= smack_flags_to_may(msqflg
);
1775 return smk_curacc(msp
, rc
);
1779 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1786 * Returns 0 if current has read and write access, error code otherwise
1788 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
1789 struct task_struct
*target
, long type
, int mode
)
1791 char *msp
= smack_of_msq(msq
);
1793 return smk_curacc(msp
, MAY_READWRITE
);
1797 * smack_ipc_permission - Smack access for ipc_permission()
1798 * @ipp: the object permissions
1799 * @flag: access requested
1801 * Returns 0 if current has read and write access, error code otherwise
1803 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
1805 char *isp
= ipp
->security
;
1808 may
= smack_flags_to_may(flag
);
1809 return smk_curacc(isp
, may
);
1813 * smack_ipc_getsecid - Extract smack security id
1814 * @ipcp: the object permissions
1815 * @secid: where result will be saved
1817 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
1819 char *smack
= ipp
->security
;
1821 *secid
= smack_to_secid(smack
);
1824 /* module stacking operations */
1827 * smack_register_security - stack capability module
1828 * @name: module name
1829 * @ops: module operations - ignored
1831 * Allow the capability module to register.
1833 static int smack_register_security(const char *name
,
1834 struct security_operations
*ops
)
1836 if (strcmp(name
, "capability") != 0)
1839 printk(KERN_INFO
"%s: Registering secondary module %s\n",
1846 * smack_d_instantiate - Make sure the blob is correct on an inode
1847 * @opt_dentry: unused
1848 * @inode: the object
1850 * Set the inode's security blob if it hasn't been done already.
1852 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
1854 struct super_block
*sbp
;
1855 struct superblock_smack
*sbsp
;
1856 struct inode_smack
*isp
;
1857 char *csp
= current
->security
;
1865 isp
= inode
->i_security
;
1867 mutex_lock(&isp
->smk_lock
);
1869 * If the inode is already instantiated
1870 * take the quick way out
1872 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
1876 sbsp
= sbp
->s_security
;
1878 * We're going to use the superblock default label
1879 * if there's no label on the file.
1881 final
= sbsp
->smk_default
;
1884 * This is pretty hackish.
1885 * Casey says that we shouldn't have to do
1886 * file system specific code, but it does help
1887 * with keeping it simple.
1889 switch (sbp
->s_magic
) {
1892 * Casey says that it's a little embarassing
1893 * that the smack file system doesn't do
1894 * extended attributes.
1896 final
= smack_known_star
.smk_known
;
1900 * Casey says pipes are easy (?)
1902 final
= smack_known_star
.smk_known
;
1904 case DEVPTS_SUPER_MAGIC
:
1906 * devpts seems content with the label of the task.
1907 * Programs that change smack have to treat the
1914 * Casey says sockets get the smack of the task.
1918 case PROC_SUPER_MAGIC
:
1920 * Casey says procfs appears not to care.
1921 * The superblock default suffices.
1926 * Device labels should come from the filesystem,
1927 * but watch out, because they're volitile,
1928 * getting recreated on every reboot.
1930 final
= smack_known_star
.smk_known
;
1934 * If a smack value has been set we want to use it,
1935 * but since tmpfs isn't giving us the opportunity
1936 * to set mount options simulate setting the
1937 * superblock default.
1941 * This isn't an understood special case.
1942 * Get the value from the xattr.
1944 * No xattr support means, alas, no SMACK label.
1945 * Use the aforeapplied default.
1946 * It would be curious if the label of the task
1947 * does not match that assigned.
1949 if (inode
->i_op
->getxattr
== NULL
)
1952 * Get the dentry for xattr.
1954 if (opt_dentry
== NULL
) {
1955 dp
= d_find_alias(inode
);
1959 dp
= dget(opt_dentry
);
1964 fetched
= smk_fetch(inode
, dp
);
1965 if (fetched
!= NULL
)
1973 isp
->smk_inode
= csp
;
1975 isp
->smk_inode
= final
;
1977 isp
->smk_flags
|= SMK_INODE_INSTANT
;
1980 mutex_unlock(&isp
->smk_lock
);
1985 * smack_getprocattr - Smack process attribute access
1986 * @p: the object task
1987 * @name: the name of the attribute in /proc/.../attr
1988 * @value: where to put the result
1990 * Places a copy of the task Smack into value
1992 * Returns the length of the smack label or an error code
1994 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
1999 if (strcmp(name
, "current") != 0)
2002 cp
= kstrdup(p
->security
, GFP_KERNEL
);
2012 * smack_setprocattr - Smack process attribute setting
2013 * @p: the object task
2014 * @name: the name of the attribute in /proc/.../attr
2015 * @value: the value to set
2016 * @size: the size of the value
2018 * Sets the Smack value of the task. Only setting self
2019 * is permitted and only with privilege
2021 * Returns the length of the smack label or an error code
2023 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2024 void *value
, size_t size
)
2028 if (!__capable(p
, CAP_MAC_ADMIN
))
2032 * Changing another process' Smack value is too dangerous
2033 * and supports no sane use case.
2038 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2041 if (strcmp(name
, "current") != 0)
2044 newsmack
= smk_import(value
, size
);
2045 if (newsmack
== NULL
)
2048 p
->security
= newsmack
;
2053 * smack_unix_stream_connect - Smack access on UDS
2055 * @other: the other socket
2058 * Return 0 if a subject with the smack of sock could access
2059 * an object with the smack of other, otherwise an error code
2061 static int smack_unix_stream_connect(struct socket
*sock
,
2062 struct socket
*other
, struct sock
*newsk
)
2064 struct inode
*sp
= SOCK_INODE(sock
);
2065 struct inode
*op
= SOCK_INODE(other
);
2067 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_READWRITE
);
2071 * smack_unix_may_send - Smack access on UDS
2073 * @other: the other socket
2075 * Return 0 if a subject with the smack of sock could access
2076 * an object with the smack of other, otherwise an error code
2078 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2080 struct inode
*sp
= SOCK_INODE(sock
);
2081 struct inode
*op
= SOCK_INODE(other
);
2083 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
);
2087 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2089 * @sap: netlabel secattr
2090 * @sip: where to put the result
2092 * Copies a smack label into sip
2094 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2096 char smack
[SMK_LABELLEN
];
2099 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) == 0) {
2101 * If there are flags but no level netlabel isn't
2102 * behaving the way we expect it to.
2104 * Without guidance regarding the smack value
2105 * for the packet fall back on the network
2108 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2112 * Get the categories, if any
2114 memset(smack
, '\0', SMK_LABELLEN
);
2115 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2117 pcat
= netlbl_secattr_catmap_walk(sap
->attr
.mls
.cat
,
2121 smack_catset_bit(pcat
, smack
);
2124 * If it is CIPSO using smack direct mapping
2125 * we are already done. WeeHee.
2127 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2128 memcpy(sip
, smack
, SMK_MAXLEN
);
2132 * Look it up in the supplied table if it is not a direct mapping.
2134 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2139 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2143 * Returns 0 if the packet should be delivered, an error code otherwise
2145 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2147 struct netlbl_lsm_secattr secattr
;
2148 struct socket_smack
*ssp
= sk
->sk_security
;
2149 char smack
[SMK_LABELLEN
];
2152 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2156 * Translate what netlabel gave us.
2158 memset(smack
, '\0', SMK_LABELLEN
);
2159 netlbl_secattr_init(&secattr
);
2160 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2162 smack_from_secattr(&secattr
, smack
);
2164 strncpy(smack
, smack_net_ambient
, SMK_MAXLEN
);
2165 netlbl_secattr_destroy(&secattr
);
2167 * Receiving a packet requires that the other end
2168 * be able to write here. Read access is not required.
2169 * This is the simplist possible security model
2172 return smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2176 * smack_socket_getpeersec_stream - pull in packet label
2178 * @optval: user's destination
2179 * @optlen: size thereof
2182 * returns zero on success, an error code otherwise
2184 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2185 char __user
*optval
,
2186 int __user
*optlen
, unsigned len
)
2188 struct socket_smack
*ssp
;
2192 ssp
= sock
->sk
->sk_security
;
2193 slen
= strlen(ssp
->smk_packet
) + 1;
2197 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2200 if (put_user(slen
, optlen
) != 0)
2208 * smack_socket_getpeersec_dgram - pull in packet label
2211 * @secid: pointer to where to put the secid of the packet
2213 * Sets the netlabel socket state on sk from parent
2215 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2216 struct sk_buff
*skb
, u32
*secid
)
2219 struct netlbl_lsm_secattr secattr
;
2221 char smack
[SMK_LABELLEN
];
2222 int family
= PF_INET
;
2227 * Only works for families with packets.
2231 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2233 family
= sk
->sk_family
;
2236 * Translate what netlabel gave us.
2238 memset(smack
, '\0', SMK_LABELLEN
);
2239 netlbl_secattr_init(&secattr
);
2240 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2242 smack_from_secattr(&secattr
, smack
);
2243 netlbl_secattr_destroy(&secattr
);
2246 * Give up if we couldn't get anything
2251 s
= smack_to_secid(smack
);
2260 * smack_sock_graft - graft access state between two sockets
2262 * @parent: donor socket
2264 * Sets the netlabel socket state on sk from parent
2266 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2268 struct socket_smack
*ssp
;
2274 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2277 ssp
= sk
->sk_security
;
2278 ssp
->smk_in
= current
->security
;
2279 ssp
->smk_out
= current
->security
;
2280 ssp
->smk_packet
[0] = '\0';
2282 rc
= smack_netlabel(sk
);
2284 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
2289 * smack_inet_conn_request - Smack access check on connect
2290 * @sk: socket involved
2294 * Returns 0 if a task with the packet label could write to
2295 * the socket, otherwise an error code
2297 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2298 struct request_sock
*req
)
2300 struct netlbl_lsm_secattr skb_secattr
;
2301 struct socket_smack
*ssp
= sk
->sk_security
;
2302 char smack
[SMK_LABELLEN
];
2308 memset(smack
, '\0', SMK_LABELLEN
);
2309 netlbl_secattr_init(&skb_secattr
);
2310 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &skb_secattr
);
2312 smack_from_secattr(&skb_secattr
, smack
);
2314 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2315 netlbl_secattr_destroy(&skb_secattr
);
2317 * Receiving a packet requires that the other end
2318 * be able to write here. Read access is not required.
2320 * If the request is successful save the peer's label
2321 * so that SO_PEERCRED can report it.
2323 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2325 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2331 * Key management security hooks
2333 * Casey has not tested key support very heavily.
2334 * The permission check is most likely too restrictive.
2335 * If you care about keys please have a look.
2340 * smack_key_alloc - Set the key security blob
2342 * @tsk: the task associated with the key
2345 * No allocation required
2349 static int smack_key_alloc(struct key
*key
, struct task_struct
*tsk
,
2350 unsigned long flags
)
2352 key
->security
= tsk
->security
;
2357 * smack_key_free - Clear the key security blob
2360 * Clear the blob pointer
2362 static void smack_key_free(struct key
*key
)
2364 key
->security
= NULL
;
2368 * smack_key_permission - Smack access on a key
2369 * @key_ref: gets to the object
2370 * @context: task involved
2373 * Return 0 if the task has read and write to the object,
2374 * an error code otherwise
2376 static int smack_key_permission(key_ref_t key_ref
,
2377 struct task_struct
*context
, key_perm_t perm
)
2381 keyp
= key_ref_to_ptr(key_ref
);
2385 * If the key hasn't been initialized give it access so that
2388 if (keyp
->security
== NULL
)
2391 * This should not occur
2393 if (context
->security
== NULL
)
2396 return smk_access(context
->security
, keyp
->security
, MAY_READWRITE
);
2398 #endif /* CONFIG_KEYS */
2403 * Audit requires a unique representation of each Smack specific
2404 * rule. This unique representation is used to distinguish the
2405 * object to be audited from remaining kernel objects and also
2406 * works as a glue between the audit hooks.
2408 * Since repository entries are added but never deleted, we'll use
2409 * the smack_known label address related to the given audit rule as
2410 * the needed unique representation. This also better fits the smack
2411 * model where nearly everything is a label.
2416 * smack_audit_rule_init - Initialize a smack audit rule
2417 * @field: audit rule fields given from user-space (audit.h)
2418 * @op: required testing operator (=, !=, >, <, ...)
2419 * @rulestr: smack label to be audited
2420 * @vrule: pointer to save our own audit rule representation
2422 * Prepare to audit cases where (@field @op @rulestr) is true.
2423 * The label to be audited is created if necessay.
2425 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2427 char **rule
= (char **)vrule
;
2430 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2433 if (op
!= AUDIT_EQUAL
&& op
!= AUDIT_NOT_EQUAL
)
2436 *rule
= smk_import(rulestr
, 0);
2442 * smack_audit_rule_known - Distinguish Smack audit rules
2443 * @krule: rule of interest, in Audit kernel representation format
2445 * This is used to filter Smack rules from remaining Audit ones.
2446 * If it's proved that this rule belongs to us, the
2447 * audit_rule_match hook will be called to do the final judgement.
2449 static int smack_audit_rule_known(struct audit_krule
*krule
)
2451 struct audit_field
*f
;
2454 for (i
= 0; i
< krule
->field_count
; i
++) {
2455 f
= &krule
->fields
[i
];
2457 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2465 * smack_audit_rule_match - Audit given object ?
2466 * @secid: security id for identifying the object to test
2467 * @field: audit rule flags given from user-space
2468 * @op: required testing operator
2469 * @vrule: smack internal rule presentation
2470 * @actx: audit context associated with the check
2472 * The core Audit hook. It's used to take the decision of
2473 * whether to audit or not to audit a given object.
2475 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2476 struct audit_context
*actx
)
2482 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2483 "Smack: missing rule\n");
2487 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2490 smack
= smack_from_secid(secid
);
2493 * No need to do string comparisons. If a match occurs,
2494 * both pointers will point to the same smack_known
2497 if (op
== AUDIT_EQUAL
)
2498 return (rule
== smack
);
2499 if (op
== AUDIT_NOT_EQUAL
)
2500 return (rule
!= smack
);
2506 * smack_audit_rule_free - free smack rule representation
2507 * @vrule: rule to be freed.
2509 * No memory was allocated.
2511 static void smack_audit_rule_free(void *vrule
)
2516 #endif /* CONFIG_AUDIT */
2519 * smack_secid_to_secctx - return the smack label for a secid
2520 * @secid: incoming integer
2521 * @secdata: destination
2522 * @seclen: how long it is
2524 * Exists for networking code.
2526 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
2528 char *sp
= smack_from_secid(secid
);
2531 *seclen
= strlen(sp
);
2536 * smack_secctx_to_secid - return the secid for a smack label
2537 * @secdata: smack label
2538 * @seclen: how long result is
2539 * @secid: outgoing integer
2541 * Exists for audit and networking code.
2543 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
2545 *secid
= smack_to_secid(secdata
);
2550 * smack_release_secctx - don't do anything.
2555 * Exists to make sure nothing gets done, and properly
2557 static void smack_release_secctx(char *secdata
, u32 seclen
)
2561 struct security_operations smack_ops
= {
2564 .ptrace
= smack_ptrace
,
2565 .capget
= cap_capget
,
2566 .capset_check
= cap_capset_check
,
2567 .capset_set
= cap_capset_set
,
2568 .capable
= cap_capable
,
2569 .syslog
= smack_syslog
,
2570 .settime
= cap_settime
,
2571 .vm_enough_memory
= cap_vm_enough_memory
,
2573 .bprm_apply_creds
= cap_bprm_apply_creds
,
2574 .bprm_set_security
= cap_bprm_set_security
,
2575 .bprm_secureexec
= cap_bprm_secureexec
,
2577 .sb_alloc_security
= smack_sb_alloc_security
,
2578 .sb_free_security
= smack_sb_free_security
,
2579 .sb_copy_data
= smack_sb_copy_data
,
2580 .sb_kern_mount
= smack_sb_kern_mount
,
2581 .sb_statfs
= smack_sb_statfs
,
2582 .sb_mount
= smack_sb_mount
,
2583 .sb_umount
= smack_sb_umount
,
2585 .inode_alloc_security
= smack_inode_alloc_security
,
2586 .inode_free_security
= smack_inode_free_security
,
2587 .inode_init_security
= smack_inode_init_security
,
2588 .inode_link
= smack_inode_link
,
2589 .inode_unlink
= smack_inode_unlink
,
2590 .inode_rmdir
= smack_inode_rmdir
,
2591 .inode_rename
= smack_inode_rename
,
2592 .inode_permission
= smack_inode_permission
,
2593 .inode_setattr
= smack_inode_setattr
,
2594 .inode_getattr
= smack_inode_getattr
,
2595 .inode_setxattr
= smack_inode_setxattr
,
2596 .inode_post_setxattr
= smack_inode_post_setxattr
,
2597 .inode_getxattr
= smack_inode_getxattr
,
2598 .inode_removexattr
= smack_inode_removexattr
,
2599 .inode_need_killpriv
= cap_inode_need_killpriv
,
2600 .inode_killpriv
= cap_inode_killpriv
,
2601 .inode_getsecurity
= smack_inode_getsecurity
,
2602 .inode_setsecurity
= smack_inode_setsecurity
,
2603 .inode_listsecurity
= smack_inode_listsecurity
,
2604 .inode_getsecid
= smack_inode_getsecid
,
2606 .file_permission
= smack_file_permission
,
2607 .file_alloc_security
= smack_file_alloc_security
,
2608 .file_free_security
= smack_file_free_security
,
2609 .file_ioctl
= smack_file_ioctl
,
2610 .file_lock
= smack_file_lock
,
2611 .file_fcntl
= smack_file_fcntl
,
2612 .file_set_fowner
= smack_file_set_fowner
,
2613 .file_send_sigiotask
= smack_file_send_sigiotask
,
2614 .file_receive
= smack_file_receive
,
2616 .task_alloc_security
= smack_task_alloc_security
,
2617 .task_free_security
= smack_task_free_security
,
2618 .task_post_setuid
= cap_task_post_setuid
,
2619 .task_setpgid
= smack_task_setpgid
,
2620 .task_getpgid
= smack_task_getpgid
,
2621 .task_getsid
= smack_task_getsid
,
2622 .task_getsecid
= smack_task_getsecid
,
2623 .task_setnice
= smack_task_setnice
,
2624 .task_setioprio
= smack_task_setioprio
,
2625 .task_getioprio
= smack_task_getioprio
,
2626 .task_setscheduler
= smack_task_setscheduler
,
2627 .task_getscheduler
= smack_task_getscheduler
,
2628 .task_movememory
= smack_task_movememory
,
2629 .task_kill
= smack_task_kill
,
2630 .task_wait
= smack_task_wait
,
2631 .task_reparent_to_init
= cap_task_reparent_to_init
,
2632 .task_to_inode
= smack_task_to_inode
,
2633 .task_prctl
= cap_task_prctl
,
2635 .ipc_permission
= smack_ipc_permission
,
2636 .ipc_getsecid
= smack_ipc_getsecid
,
2638 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
2639 .msg_msg_free_security
= smack_msg_msg_free_security
,
2641 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
2642 .msg_queue_free_security
= smack_msg_queue_free_security
,
2643 .msg_queue_associate
= smack_msg_queue_associate
,
2644 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
2645 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
2646 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
2648 .shm_alloc_security
= smack_shm_alloc_security
,
2649 .shm_free_security
= smack_shm_free_security
,
2650 .shm_associate
= smack_shm_associate
,
2651 .shm_shmctl
= smack_shm_shmctl
,
2652 .shm_shmat
= smack_shm_shmat
,
2654 .sem_alloc_security
= smack_sem_alloc_security
,
2655 .sem_free_security
= smack_sem_free_security
,
2656 .sem_associate
= smack_sem_associate
,
2657 .sem_semctl
= smack_sem_semctl
,
2658 .sem_semop
= smack_sem_semop
,
2660 .netlink_send
= cap_netlink_send
,
2661 .netlink_recv
= cap_netlink_recv
,
2663 .register_security
= smack_register_security
,
2665 .d_instantiate
= smack_d_instantiate
,
2667 .getprocattr
= smack_getprocattr
,
2668 .setprocattr
= smack_setprocattr
,
2670 .unix_stream_connect
= smack_unix_stream_connect
,
2671 .unix_may_send
= smack_unix_may_send
,
2673 .socket_post_create
= smack_socket_post_create
,
2674 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
2675 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
2676 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
2677 .sk_alloc_security
= smack_sk_alloc_security
,
2678 .sk_free_security
= smack_sk_free_security
,
2679 .sock_graft
= smack_sock_graft
,
2680 .inet_conn_request
= smack_inet_conn_request
,
2682 /* key management security hooks */
2684 .key_alloc
= smack_key_alloc
,
2685 .key_free
= smack_key_free
,
2686 .key_permission
= smack_key_permission
,
2687 #endif /* CONFIG_KEYS */
2691 .audit_rule_init
= smack_audit_rule_init
,
2692 .audit_rule_known
= smack_audit_rule_known
,
2693 .audit_rule_match
= smack_audit_rule_match
,
2694 .audit_rule_free
= smack_audit_rule_free
,
2695 #endif /* CONFIG_AUDIT */
2697 .secid_to_secctx
= smack_secid_to_secctx
,
2698 .secctx_to_secid
= smack_secctx_to_secid
,
2699 .release_secctx
= smack_release_secctx
,
2703 * smack_init - initialize the smack system
2707 static __init
int smack_init(void)
2709 if (!security_module_enable(&smack_ops
))
2712 printk(KERN_INFO
"Smack: Initializing.\n");
2715 * Set the security state for the initial task.
2717 current
->security
= &smack_known_floor
.smk_known
;
2722 spin_lock_init(&smack_known_unset
.smk_cipsolock
);
2723 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
2724 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
2725 spin_lock_init(&smack_known_star
.smk_cipsolock
);
2726 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
2727 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
2732 if (register_security(&smack_ops
))
2733 panic("smack: Unable to register with kernel.\n");
2739 * Smack requires early initialization in order to label
2740 * all processes and objects when they are created.
2742 security_initcall(smack_init
);