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
,
103 rc
= cap_ptrace(ptp
, ctp
, mode
);
107 rc
= smk_access(ptp
->security
, ctp
->security
, MAY_READWRITE
);
108 if (rc
!= 0 && __capable(ptp
, CAP_MAC_OVERRIDE
))
115 * smack_syslog - Smack approval on syslog
116 * @type: message type
118 * Require that the task has the floor label
120 * Returns 0 on success, error code otherwise.
122 static int smack_syslog(int type
)
125 char *sp
= current
->security
;
127 rc
= cap_syslog(type
);
131 if (capable(CAP_MAC_OVERRIDE
))
134 if (sp
!= smack_known_floor
.smk_known
)
146 * smack_sb_alloc_security - allocate a superblock blob
147 * @sb: the superblock getting the blob
149 * Returns 0 on success or -ENOMEM on error.
151 static int smack_sb_alloc_security(struct super_block
*sb
)
153 struct superblock_smack
*sbsp
;
155 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
160 sbsp
->smk_root
= smack_known_floor
.smk_known
;
161 sbsp
->smk_default
= smack_known_floor
.smk_known
;
162 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
163 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
164 sbsp
->smk_initialized
= 0;
165 spin_lock_init(&sbsp
->smk_sblock
);
167 sb
->s_security
= sbsp
;
173 * smack_sb_free_security - free a superblock blob
174 * @sb: the superblock getting the blob
177 static void smack_sb_free_security(struct super_block
*sb
)
179 kfree(sb
->s_security
);
180 sb
->s_security
= NULL
;
184 * smack_sb_copy_data - copy mount options data for processing
185 * @type: file system type
186 * @orig: where to start
189 * Returns 0 on success or -ENOMEM on error.
191 * Copy the Smack specific mount options out of the mount
194 static int smack_sb_copy_data(char *orig
, char *smackopts
)
196 char *cp
, *commap
, *otheropts
, *dp
;
198 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
199 if (otheropts
== NULL
)
202 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
203 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
205 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
207 else if (strstr(cp
, SMK_FSHAT
) == cp
)
209 else if (strstr(cp
, SMK_FSROOT
) == cp
)
214 commap
= strchr(cp
, ',');
223 strcpy(orig
, otheropts
);
224 free_page((unsigned long)otheropts
);
230 * smack_sb_kern_mount - Smack specific mount processing
231 * @sb: the file system superblock
232 * @data: the smack mount options
234 * Returns 0 on success, an error code on failure
236 static int smack_sb_kern_mount(struct super_block
*sb
, void *data
)
238 struct dentry
*root
= sb
->s_root
;
239 struct inode
*inode
= root
->d_inode
;
240 struct superblock_smack
*sp
= sb
->s_security
;
241 struct inode_smack
*isp
;
246 spin_lock(&sp
->smk_sblock
);
247 if (sp
->smk_initialized
!= 0) {
248 spin_unlock(&sp
->smk_sblock
);
251 sp
->smk_initialized
= 1;
252 spin_unlock(&sp
->smk_sblock
);
254 for (op
= data
; op
!= NULL
; op
= commap
) {
255 commap
= strchr(op
, ',');
259 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
260 op
+= strlen(SMK_FSHAT
);
261 nsp
= smk_import(op
, 0);
264 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
265 op
+= strlen(SMK_FSFLOOR
);
266 nsp
= smk_import(op
, 0);
269 } else if (strncmp(op
, SMK_FSDEFAULT
,
270 strlen(SMK_FSDEFAULT
)) == 0) {
271 op
+= strlen(SMK_FSDEFAULT
);
272 nsp
= smk_import(op
, 0);
274 sp
->smk_default
= nsp
;
275 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
276 op
+= strlen(SMK_FSROOT
);
277 nsp
= smk_import(op
, 0);
284 * Initialize the root inode.
286 isp
= inode
->i_security
;
288 inode
->i_security
= new_inode_smack(sp
->smk_root
);
290 isp
->smk_inode
= sp
->smk_root
;
296 * smack_sb_statfs - Smack check on statfs
297 * @dentry: identifies the file system in question
299 * Returns 0 if current can read the floor of the filesystem,
300 * and error code otherwise
302 static int smack_sb_statfs(struct dentry
*dentry
)
304 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
306 return smk_curacc(sbp
->smk_floor
, MAY_READ
);
310 * smack_sb_mount - Smack check for mounting
317 * Returns 0 if current can write the floor of the filesystem
318 * being mounted on, an error code otherwise.
320 static int smack_sb_mount(char *dev_name
, struct path
*path
,
321 char *type
, unsigned long flags
, void *data
)
323 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
325 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
329 * smack_sb_umount - Smack check for unmounting
330 * @mnt: file system to unmount
333 * Returns 0 if current can write the floor of the filesystem
334 * being unmounted, an error code otherwise.
336 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
338 struct superblock_smack
*sbp
;
340 sbp
= mnt
->mnt_sb
->s_security
;
342 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
350 * smack_inode_alloc_security - allocate an inode blob
351 * @inode - the inode in need of a blob
353 * Returns 0 if it gets a blob, -ENOMEM otherwise
355 static int smack_inode_alloc_security(struct inode
*inode
)
357 inode
->i_security
= new_inode_smack(current
->security
);
358 if (inode
->i_security
== NULL
)
364 * smack_inode_free_security - free an inode blob
365 * @inode - the inode with a blob
367 * Clears the blob pointer in inode
369 static void smack_inode_free_security(struct inode
*inode
)
371 kfree(inode
->i_security
);
372 inode
->i_security
= NULL
;
376 * smack_inode_init_security - copy out the smack from an inode
379 * @name: where to put the attribute name
380 * @value: where to put the attribute value
381 * @len: where to put the length of the attribute
383 * Returns 0 if it all works out, -ENOMEM if there's no memory
385 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
386 char **name
, void **value
, size_t *len
)
388 char *isp
= smk_of_inode(inode
);
391 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
397 *value
= kstrdup(isp
, GFP_KERNEL
);
403 *len
= strlen(isp
) + 1;
409 * smack_inode_link - Smack check on link
410 * @old_dentry: the existing object
412 * @new_dentry: the new object
414 * Returns 0 if access is permitted, an error code otherwise
416 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
417 struct dentry
*new_dentry
)
422 isp
= smk_of_inode(old_dentry
->d_inode
);
423 rc
= smk_curacc(isp
, MAY_WRITE
);
425 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
426 isp
= smk_of_inode(new_dentry
->d_inode
);
427 rc
= smk_curacc(isp
, MAY_WRITE
);
434 * smack_inode_unlink - Smack check on inode deletion
435 * @dir: containing directory object
436 * @dentry: file to unlink
438 * Returns 0 if current can write the containing directory
439 * and the object, error code otherwise
441 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
443 struct inode
*ip
= dentry
->d_inode
;
447 * You need write access to the thing you're unlinking
449 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
);
452 * You also need write access to the containing directory
454 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
460 * smack_inode_rmdir - Smack check on directory deletion
461 * @dir: containing directory object
462 * @dentry: directory to unlink
464 * Returns 0 if current can write the containing directory
465 * and the directory, error code otherwise
467 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
472 * You need write access to the thing you're removing
474 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
477 * You also need write access to the containing directory
479 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
485 * smack_inode_rename - Smack check on rename
486 * @old_inode: the old directory
487 * @old_dentry: unused
488 * @new_inode: the new directory
489 * @new_dentry: unused
491 * Read and write access is required on both the old and
494 * Returns 0 if access is permitted, an error code otherwise
496 static int smack_inode_rename(struct inode
*old_inode
,
497 struct dentry
*old_dentry
,
498 struct inode
*new_inode
,
499 struct dentry
*new_dentry
)
504 isp
= smk_of_inode(old_dentry
->d_inode
);
505 rc
= smk_curacc(isp
, MAY_READWRITE
);
507 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
508 isp
= smk_of_inode(new_dentry
->d_inode
);
509 rc
= smk_curacc(isp
, MAY_READWRITE
);
516 * smack_inode_permission - Smack version of permission()
517 * @inode: the inode in question
518 * @mask: the access requested
521 * This is the important Smack hook.
523 * Returns 0 if access is permitted, -EACCES otherwise
525 static int smack_inode_permission(struct inode
*inode
, int mask
,
526 struct nameidata
*nd
)
529 * No permission to check. Existence test. Yup, it's there.
534 return smk_curacc(smk_of_inode(inode
), mask
);
538 * smack_inode_setattr - Smack check for setting attributes
539 * @dentry: the object
540 * @iattr: for the force flag
542 * Returns 0 if access is permitted, an error code otherwise
544 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
547 * Need to allow for clearing the setuid bit.
549 if (iattr
->ia_valid
& ATTR_FORCE
)
552 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
556 * smack_inode_getattr - Smack check for getting attributes
558 * @dentry: the object
560 * Returns 0 if access is permitted, an error code otherwise
562 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
564 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
568 * smack_inode_setxattr - Smack check for setting xattrs
569 * @dentry: the object
570 * @name: name of the attribute
575 * This protects the Smack attribute explicitly.
577 * Returns 0 if access is permitted, an error code otherwise
579 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
580 const void *value
, size_t size
, int flags
)
584 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
585 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
586 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
587 if (!capable(CAP_MAC_ADMIN
))
590 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
593 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
599 * smack_inode_post_setxattr - Apply the Smack update approved above
601 * @name: attribute name
602 * @value: attribute value
603 * @size: attribute size
606 * Set the pointer in the inode blob to the entry found
607 * in the master label list.
609 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
610 const void *value
, size_t size
, int flags
)
612 struct inode_smack
*isp
;
618 if (strcmp(name
, XATTR_NAME_SMACK
))
621 if (size
>= SMK_LABELLEN
)
624 isp
= dentry
->d_inode
->i_security
;
627 * No locking is done here. This is a pointer
630 nsp
= smk_import(value
, size
);
632 isp
->smk_inode
= nsp
;
634 isp
->smk_inode
= smack_known_invalid
.smk_known
;
640 * smack_inode_getxattr - Smack check on getxattr
641 * @dentry: the object
644 * Returns 0 if access is permitted, an error code otherwise
646 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
648 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
652 * smack_inode_removexattr - Smack check on removexattr
653 * @dentry: the object
654 * @name: name of the attribute
656 * Removing the Smack attribute requires CAP_MAC_ADMIN
658 * Returns 0 if access is permitted, an error code otherwise
660 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
664 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
665 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
666 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
667 if (!capable(CAP_MAC_ADMIN
))
670 rc
= cap_inode_removexattr(dentry
, name
);
673 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
679 * smack_inode_getsecurity - get smack xattrs
681 * @name: attribute name
682 * @buffer: where to put the result
683 * @size: size of the buffer
686 * Returns the size of the attribute or an error code
688 static int smack_inode_getsecurity(const struct inode
*inode
,
689 const char *name
, void **buffer
,
692 struct socket_smack
*ssp
;
694 struct super_block
*sbp
;
695 struct inode
*ip
= (struct inode
*)inode
;
700 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
701 isp
= smk_of_inode(inode
);
702 ilen
= strlen(isp
) + 1;
708 * The rest of the Smack xattrs are only on sockets.
711 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
715 if (sock
== NULL
|| sock
->sk
== NULL
)
718 ssp
= sock
->sk
->sk_security
;
720 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
722 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
727 ilen
= strlen(isp
) + 1;
738 * smack_inode_listsecurity - list the Smack attributes
740 * @buffer: where they go
741 * @buffer_size: size of buffer
743 * Returns 0 on success, -EINVAL otherwise
745 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
748 int len
= strlen(XATTR_NAME_SMACK
);
750 if (buffer
!= NULL
&& len
<= buffer_size
) {
751 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
758 * smack_inode_getsecid - Extract inode's security id
759 * @inode: inode to extract the info from
760 * @secid: where result will be saved
762 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
764 struct inode_smack
*isp
= inode
->i_security
;
766 *secid
= smack_to_secid(isp
->smk_inode
);
774 * smack_file_permission - Smack check on file operations
780 * Should access checks be done on each read or write?
781 * UNICOS and SELinux say yes.
782 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
784 * I'll say no for now. Smack does not do the frequent
785 * label changing that SELinux does.
787 static int smack_file_permission(struct file
*file
, int mask
)
793 * smack_file_alloc_security - assign a file security blob
796 * The security blob for a file is a pointer to the master
797 * label list, so no allocation is done.
801 static int smack_file_alloc_security(struct file
*file
)
803 file
->f_security
= current
->security
;
808 * smack_file_free_security - clear a file security blob
811 * The security blob for a file is a pointer to the master
812 * label list, so no memory is freed.
814 static void smack_file_free_security(struct file
*file
)
816 file
->f_security
= NULL
;
820 * smack_file_ioctl - Smack check on ioctls
825 * Relies heavily on the correct use of the ioctl command conventions.
827 * Returns 0 if allowed, error code otherwise
829 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
834 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
835 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
837 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
838 rc
= smk_curacc(file
->f_security
, MAY_READ
);
844 * smack_file_lock - Smack check on file locking
848 * Returns 0 if current has write access, error code otherwise
850 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
852 return smk_curacc(file
->f_security
, MAY_WRITE
);
856 * smack_file_fcntl - Smack check on fcntl
858 * @cmd: what action to check
861 * Returns 0 if current has access, error code otherwise
863 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
875 rc
= smk_curacc(file
->f_security
, MAY_READ
);
883 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
886 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
);
893 * smack_file_set_fowner - set the file security blob value
894 * @file: object in question
897 * Further research may be required on this one.
899 static int smack_file_set_fowner(struct file
*file
)
901 file
->f_security
= current
->security
;
906 * smack_file_send_sigiotask - Smack on sigio
907 * @tsk: The target task
908 * @fown: the object the signal come from
911 * Allow a privileged task to get signals even if it shouldn't
913 * Returns 0 if a subject with the object's smack could
914 * write to the task, an error code otherwise.
916 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
917 struct fown_struct
*fown
, int signum
)
923 * struct fown_struct is never outside the context of a struct file
925 file
= container_of(fown
, struct file
, f_owner
);
926 rc
= smk_access(file
->f_security
, tsk
->security
, MAY_WRITE
);
927 if (rc
!= 0 && __capable(tsk
, CAP_MAC_OVERRIDE
))
933 * smack_file_receive - Smack file receive check
936 * Returns 0 if current has access, error code otherwise
938 static int smack_file_receive(struct file
*file
)
943 * This code relies on bitmasks.
945 if (file
->f_mode
& FMODE_READ
)
947 if (file
->f_mode
& FMODE_WRITE
)
950 return smk_curacc(file
->f_security
, may
);
958 * smack_task_alloc_security - "allocate" a task blob
959 * @tsk: the task in need of a blob
961 * Smack isn't using copies of blobs. Everyone
962 * points to an immutable list. No alloc required.
963 * No data copy required.
967 static int smack_task_alloc_security(struct task_struct
*tsk
)
969 tsk
->security
= current
->security
;
975 * smack_task_free_security - "free" a task blob
976 * @task: the task with the blob
978 * Smack isn't using copies of blobs. Everyone
979 * points to an immutable list. The blobs never go away.
980 * There is no leak here.
982 static void smack_task_free_security(struct task_struct
*task
)
984 task
->security
= NULL
;
988 * smack_task_setpgid - Smack check on setting pgid
989 * @p: the task object
992 * Return 0 if write access is permitted
994 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
996 return smk_curacc(p
->security
, MAY_WRITE
);
1000 * smack_task_getpgid - Smack access check for getpgid
1001 * @p: the object task
1003 * Returns 0 if current can read the object task, error code otherwise
1005 static int smack_task_getpgid(struct task_struct
*p
)
1007 return smk_curacc(p
->security
, MAY_READ
);
1011 * smack_task_getsid - Smack access check for getsid
1012 * @p: the object task
1014 * Returns 0 if current can read the object task, error code otherwise
1016 static int smack_task_getsid(struct task_struct
*p
)
1018 return smk_curacc(p
->security
, MAY_READ
);
1022 * smack_task_getsecid - get the secid of the task
1023 * @p: the object task
1024 * @secid: where to put the result
1026 * Sets the secid to contain a u32 version of the smack label.
1028 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1030 *secid
= smack_to_secid(p
->security
);
1034 * smack_task_setnice - Smack check on setting nice
1035 * @p: the task object
1038 * Return 0 if write access is permitted
1040 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1044 rc
= cap_task_setnice(p
, nice
);
1046 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1051 * smack_task_setioprio - Smack check on setting ioprio
1052 * @p: the task object
1055 * Return 0 if write access is permitted
1057 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1061 rc
= cap_task_setioprio(p
, ioprio
);
1063 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1068 * smack_task_getioprio - Smack check on reading ioprio
1069 * @p: the task object
1071 * Return 0 if read access is permitted
1073 static int smack_task_getioprio(struct task_struct
*p
)
1075 return smk_curacc(p
->security
, MAY_READ
);
1079 * smack_task_setscheduler - Smack check on setting scheduler
1080 * @p: the task object
1084 * Return 0 if read access is permitted
1086 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1087 struct sched_param
*lp
)
1091 rc
= cap_task_setscheduler(p
, policy
, lp
);
1093 rc
= smk_curacc(p
->security
, MAY_WRITE
);
1098 * smack_task_getscheduler - Smack check on reading scheduler
1099 * @p: the task object
1101 * Return 0 if read access is permitted
1103 static int smack_task_getscheduler(struct task_struct
*p
)
1105 return smk_curacc(p
->security
, MAY_READ
);
1109 * smack_task_movememory - Smack check on moving memory
1110 * @p: the task object
1112 * Return 0 if write access is permitted
1114 static int smack_task_movememory(struct task_struct
*p
)
1116 return smk_curacc(p
->security
, MAY_WRITE
);
1120 * smack_task_kill - Smack check on signal delivery
1121 * @p: the task object
1124 * @secid: identifies the smack to use in lieu of current's
1126 * Return 0 if write access is permitted
1128 * The secid behavior is an artifact of an SELinux hack
1129 * in the USB code. Someday it may go away.
1131 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1135 * Sending a signal requires that the sender
1136 * can write the receiver.
1139 return smk_curacc(p
->security
, MAY_WRITE
);
1141 * If the secid isn't 0 we're dealing with some USB IO
1142 * specific behavior. This is not clean. For one thing
1143 * we can't take privilege into account.
1145 return smk_access(smack_from_secid(secid
), p
->security
, MAY_WRITE
);
1149 * smack_task_wait - Smack access check for waiting
1150 * @p: task to wait for
1152 * Returns 0 if current can wait for p, error code otherwise
1154 static int smack_task_wait(struct task_struct
*p
)
1158 rc
= smk_access(current
->security
, p
->security
, MAY_WRITE
);
1163 * Allow the operation to succeed if either task
1164 * has privilege to perform operations that might
1165 * account for the smack labels having gotten to
1166 * be different in the first place.
1168 * This breaks the strict subjet/object access
1169 * control ideal, taking the object's privilege
1170 * state into account in the decision as well as
1173 if (capable(CAP_MAC_OVERRIDE
) || __capable(p
, CAP_MAC_OVERRIDE
))
1180 * smack_task_to_inode - copy task smack into the inode blob
1181 * @p: task to copy from
1182 * inode: inode to copy to
1184 * Sets the smack pointer in the inode security blob
1186 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1188 struct inode_smack
*isp
= inode
->i_security
;
1189 isp
->smk_inode
= p
->security
;
1197 * smack_sk_alloc_security - Allocate a socket blob
1200 * @priority: memory allocation priority
1202 * Assign Smack pointers to current
1204 * Returns 0 on success, -ENOMEM is there's no memory
1206 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1208 char *csp
= current
->security
;
1209 struct socket_smack
*ssp
;
1211 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1217 ssp
->smk_packet
[0] = '\0';
1219 sk
->sk_security
= ssp
;
1225 * smack_sk_free_security - Free a socket blob
1228 * Clears the blob pointer
1230 static void smack_sk_free_security(struct sock
*sk
)
1232 kfree(sk
->sk_security
);
1236 * smack_set_catset - convert a capset to netlabel mls categories
1237 * @catset: the Smack categories
1238 * @sap: where to put the netlabel categories
1240 * Allocates and fills attr.mls.cat
1242 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1253 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1254 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1255 sap
->attr
.mls
.cat
->startbit
= 0;
1257 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1258 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1261 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1267 * smack_to_secattr - fill a secattr from a smack value
1268 * @smack: the smack value
1269 * @nlsp: where the result goes
1271 * Casey says that CIPSO is good enough for now.
1272 * It can be used to effect.
1273 * It can also be abused to effect when necessary.
1274 * Appologies to the TSIG group in general and GW in particular.
1276 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1278 struct smack_cipso cipso
;
1281 switch (smack_net_nltype
) {
1282 case NETLBL_NLTYPE_CIPSOV4
:
1283 nlsp
->domain
= smack
;
1284 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1286 rc
= smack_to_cipso(smack
, &cipso
);
1288 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1289 smack_set_catset(cipso
.smk_catset
, nlsp
);
1291 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1292 smack_set_catset(smack
, nlsp
);
1301 * smack_netlabel - Set the secattr on a socket
1304 * Convert the outbound smack value (smk_out) to a
1305 * secattr and attach it to the socket.
1307 * Returns 0 on success or an error code
1309 static int smack_netlabel(struct sock
*sk
)
1311 struct socket_smack
*ssp
;
1312 struct netlbl_lsm_secattr secattr
;
1315 ssp
= sk
->sk_security
;
1316 netlbl_secattr_init(&secattr
);
1317 smack_to_secattr(ssp
->smk_out
, &secattr
);
1318 rc
= netlbl_sock_setattr(sk
, &secattr
);
1319 netlbl_secattr_destroy(&secattr
);
1325 * smack_inode_setsecurity - set smack xattrs
1326 * @inode: the object
1327 * @name: attribute name
1328 * @value: attribute value
1329 * @size: size of the attribute
1332 * Sets the named attribute in the appropriate blob
1334 * Returns 0 on success, or an error code
1336 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1337 const void *value
, size_t size
, int flags
)
1340 struct inode_smack
*nsp
= inode
->i_security
;
1341 struct socket_smack
*ssp
;
1342 struct socket
*sock
;
1345 if (value
== NULL
|| size
> SMK_LABELLEN
)
1348 sp
= smk_import(value
, size
);
1352 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1353 nsp
->smk_inode
= sp
;
1357 * The rest of the Smack xattrs are only on sockets.
1359 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1362 sock
= SOCKET_I(inode
);
1363 if (sock
== NULL
|| sock
->sk
== NULL
)
1366 ssp
= sock
->sk
->sk_security
;
1368 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1370 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1372 rc
= smack_netlabel(sock
->sk
);
1374 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1383 * smack_socket_post_create - finish socket setup
1385 * @family: protocol family
1390 * Sets the netlabel information on the socket
1392 * Returns 0 on success, and error code otherwise
1394 static int smack_socket_post_create(struct socket
*sock
, int family
,
1395 int type
, int protocol
, int kern
)
1397 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1400 * Set the outbound netlbl.
1402 return smack_netlabel(sock
->sk
);
1406 * smack_flags_to_may - convert S_ to MAY_ values
1407 * @flags: the S_ value
1409 * Returns the equivalent MAY_ value
1411 static int smack_flags_to_may(int flags
)
1415 if (flags
& S_IRUGO
)
1417 if (flags
& S_IWUGO
)
1419 if (flags
& S_IXUGO
)
1426 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1431 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1433 msg
->security
= current
->security
;
1438 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1441 * Clears the blob pointer
1443 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1445 msg
->security
= NULL
;
1449 * smack_of_shm - the smack pointer for the shm
1452 * Returns a pointer to the smack value
1454 static char *smack_of_shm(struct shmid_kernel
*shp
)
1456 return (char *)shp
->shm_perm
.security
;
1460 * smack_shm_alloc_security - Set the security blob for shm
1465 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1467 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1469 isp
->security
= current
->security
;
1474 * smack_shm_free_security - Clear the security blob for shm
1477 * Clears the blob pointer
1479 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1481 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1483 isp
->security
= NULL
;
1487 * smack_shm_associate - Smack access check for shm
1489 * @shmflg: access requested
1491 * Returns 0 if current has the requested access, error code otherwise
1493 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1495 char *ssp
= smack_of_shm(shp
);
1498 may
= smack_flags_to_may(shmflg
);
1499 return smk_curacc(ssp
, may
);
1503 * smack_shm_shmctl - Smack access check for shm
1505 * @cmd: what it wants to do
1507 * Returns 0 if current has the requested access, error code otherwise
1509 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1523 may
= MAY_READWRITE
;
1528 * System level information.
1535 ssp
= smack_of_shm(shp
);
1536 return smk_curacc(ssp
, may
);
1540 * smack_shm_shmat - Smack access for shmat
1543 * @shmflg: access requested
1545 * Returns 0 if current has the requested access, error code otherwise
1547 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1550 char *ssp
= smack_of_shm(shp
);
1553 may
= smack_flags_to_may(shmflg
);
1554 return smk_curacc(ssp
, may
);
1558 * smack_of_sem - the smack pointer for the sem
1561 * Returns a pointer to the smack value
1563 static char *smack_of_sem(struct sem_array
*sma
)
1565 return (char *)sma
->sem_perm
.security
;
1569 * smack_sem_alloc_security - Set the security blob for sem
1574 static int smack_sem_alloc_security(struct sem_array
*sma
)
1576 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1578 isp
->security
= current
->security
;
1583 * smack_sem_free_security - Clear the security blob for sem
1586 * Clears the blob pointer
1588 static void smack_sem_free_security(struct sem_array
*sma
)
1590 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1592 isp
->security
= NULL
;
1596 * smack_sem_associate - Smack access check for sem
1598 * @semflg: access requested
1600 * Returns 0 if current has the requested access, error code otherwise
1602 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1604 char *ssp
= smack_of_sem(sma
);
1607 may
= smack_flags_to_may(semflg
);
1608 return smk_curacc(ssp
, may
);
1612 * smack_sem_shmctl - Smack access check for sem
1614 * @cmd: what it wants to do
1616 * Returns 0 if current has the requested access, error code otherwise
1618 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1637 may
= MAY_READWRITE
;
1642 * System level information
1649 ssp
= smack_of_sem(sma
);
1650 return smk_curacc(ssp
, may
);
1654 * smack_sem_semop - Smack checks of semaphore operations
1660 * Treated as read and write in all cases.
1662 * Returns 0 if access is allowed, error code otherwise
1664 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
1665 unsigned nsops
, int alter
)
1667 char *ssp
= smack_of_sem(sma
);
1669 return smk_curacc(ssp
, MAY_READWRITE
);
1673 * smack_msg_alloc_security - Set the security blob for msg
1678 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
1680 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1682 kisp
->security
= current
->security
;
1687 * smack_msg_free_security - Clear the security blob for msg
1690 * Clears the blob pointer
1692 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
1694 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1696 kisp
->security
= NULL
;
1700 * smack_of_msq - the smack pointer for the msq
1703 * Returns a pointer to the smack value
1705 static char *smack_of_msq(struct msg_queue
*msq
)
1707 return (char *)msq
->q_perm
.security
;
1711 * smack_msg_queue_associate - Smack access check for msg_queue
1713 * @msqflg: access requested
1715 * Returns 0 if current has the requested access, error code otherwise
1717 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
1719 char *msp
= smack_of_msq(msq
);
1722 may
= smack_flags_to_may(msqflg
);
1723 return smk_curacc(msp
, may
);
1727 * smack_msg_queue_msgctl - Smack access check for msg_queue
1729 * @cmd: what it wants to do
1731 * Returns 0 if current has the requested access, error code otherwise
1733 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
1745 may
= MAY_READWRITE
;
1750 * System level information
1757 msp
= smack_of_msq(msq
);
1758 return smk_curacc(msp
, may
);
1762 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1765 * @msqflg: access requested
1767 * Returns 0 if current has the requested access, error code otherwise
1769 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
1772 char *msp
= smack_of_msq(msq
);
1775 rc
= smack_flags_to_may(msqflg
);
1776 return smk_curacc(msp
, rc
);
1780 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1787 * Returns 0 if current has read and write access, error code otherwise
1789 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
1790 struct task_struct
*target
, long type
, int mode
)
1792 char *msp
= smack_of_msq(msq
);
1794 return smk_curacc(msp
, MAY_READWRITE
);
1798 * smack_ipc_permission - Smack access for ipc_permission()
1799 * @ipp: the object permissions
1800 * @flag: access requested
1802 * Returns 0 if current has read and write access, error code otherwise
1804 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
1806 char *isp
= ipp
->security
;
1809 may
= smack_flags_to_may(flag
);
1810 return smk_curacc(isp
, may
);
1814 * smack_ipc_getsecid - Extract smack security id
1815 * @ipcp: the object permissions
1816 * @secid: where result will be saved
1818 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
1820 char *smack
= ipp
->security
;
1822 *secid
= smack_to_secid(smack
);
1826 * smack_d_instantiate - Make sure the blob is correct on an inode
1827 * @opt_dentry: unused
1828 * @inode: the object
1830 * Set the inode's security blob if it hasn't been done already.
1832 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
1834 struct super_block
*sbp
;
1835 struct superblock_smack
*sbsp
;
1836 struct inode_smack
*isp
;
1837 char *csp
= current
->security
;
1845 isp
= inode
->i_security
;
1847 mutex_lock(&isp
->smk_lock
);
1849 * If the inode is already instantiated
1850 * take the quick way out
1852 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
1856 sbsp
= sbp
->s_security
;
1858 * We're going to use the superblock default label
1859 * if there's no label on the file.
1861 final
= sbsp
->smk_default
;
1864 * If this is the root inode the superblock
1865 * may be in the process of initialization.
1866 * If that is the case use the root value out
1867 * of the superblock.
1869 if (opt_dentry
->d_parent
== opt_dentry
) {
1870 isp
->smk_inode
= sbsp
->smk_root
;
1871 isp
->smk_flags
|= SMK_INODE_INSTANT
;
1876 * This is pretty hackish.
1877 * Casey says that we shouldn't have to do
1878 * file system specific code, but it does help
1879 * with keeping it simple.
1881 switch (sbp
->s_magic
) {
1884 * Casey says that it's a little embarassing
1885 * that the smack file system doesn't do
1886 * extended attributes.
1888 final
= smack_known_star
.smk_known
;
1892 * Casey says pipes are easy (?)
1894 final
= smack_known_star
.smk_known
;
1896 case DEVPTS_SUPER_MAGIC
:
1898 * devpts seems content with the label of the task.
1899 * Programs that change smack have to treat the
1906 * Casey says sockets get the smack of the task.
1910 case PROC_SUPER_MAGIC
:
1912 * Casey says procfs appears not to care.
1913 * The superblock default suffices.
1918 * Device labels should come from the filesystem,
1919 * but watch out, because they're volitile,
1920 * getting recreated on every reboot.
1922 final
= smack_known_star
.smk_known
;
1926 * If a smack value has been set we want to use it,
1927 * but since tmpfs isn't giving us the opportunity
1928 * to set mount options simulate setting the
1929 * superblock default.
1933 * This isn't an understood special case.
1934 * Get the value from the xattr.
1936 * No xattr support means, alas, no SMACK label.
1937 * Use the aforeapplied default.
1938 * It would be curious if the label of the task
1939 * does not match that assigned.
1941 if (inode
->i_op
->getxattr
== NULL
)
1944 * Get the dentry for xattr.
1946 if (opt_dentry
== NULL
) {
1947 dp
= d_find_alias(inode
);
1951 dp
= dget(opt_dentry
);
1956 fetched
= smk_fetch(inode
, dp
);
1957 if (fetched
!= NULL
)
1965 isp
->smk_inode
= csp
;
1967 isp
->smk_inode
= final
;
1969 isp
->smk_flags
|= SMK_INODE_INSTANT
;
1972 mutex_unlock(&isp
->smk_lock
);
1977 * smack_getprocattr - Smack process attribute access
1978 * @p: the object task
1979 * @name: the name of the attribute in /proc/.../attr
1980 * @value: where to put the result
1982 * Places a copy of the task Smack into value
1984 * Returns the length of the smack label or an error code
1986 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
1991 if (strcmp(name
, "current") != 0)
1994 cp
= kstrdup(p
->security
, GFP_KERNEL
);
2004 * smack_setprocattr - Smack process attribute setting
2005 * @p: the object task
2006 * @name: the name of the attribute in /proc/.../attr
2007 * @value: the value to set
2008 * @size: the size of the value
2010 * Sets the Smack value of the task. Only setting self
2011 * is permitted and only with privilege
2013 * Returns the length of the smack label or an error code
2015 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2016 void *value
, size_t size
)
2020 if (!__capable(p
, CAP_MAC_ADMIN
))
2024 * Changing another process' Smack value is too dangerous
2025 * and supports no sane use case.
2030 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2033 if (strcmp(name
, "current") != 0)
2036 newsmack
= smk_import(value
, size
);
2037 if (newsmack
== NULL
)
2040 p
->security
= newsmack
;
2045 * smack_unix_stream_connect - Smack access on UDS
2047 * @other: the other socket
2050 * Return 0 if a subject with the smack of sock could access
2051 * an object with the smack of other, otherwise an error code
2053 static int smack_unix_stream_connect(struct socket
*sock
,
2054 struct socket
*other
, struct sock
*newsk
)
2056 struct inode
*sp
= SOCK_INODE(sock
);
2057 struct inode
*op
= SOCK_INODE(other
);
2059 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_READWRITE
);
2063 * smack_unix_may_send - Smack access on UDS
2065 * @other: the other socket
2067 * Return 0 if a subject with the smack of sock could access
2068 * an object with the smack of other, otherwise an error code
2070 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2072 struct inode
*sp
= SOCK_INODE(sock
);
2073 struct inode
*op
= SOCK_INODE(other
);
2075 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
);
2079 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2081 * @sap: netlabel secattr
2082 * @sip: where to put the result
2084 * Copies a smack label into sip
2086 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2088 char smack
[SMK_LABELLEN
];
2091 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) == 0) {
2093 * If there are flags but no level netlabel isn't
2094 * behaving the way we expect it to.
2096 * Without guidance regarding the smack value
2097 * for the packet fall back on the network
2100 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2104 * Get the categories, if any
2106 memset(smack
, '\0', SMK_LABELLEN
);
2107 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2109 pcat
= netlbl_secattr_catmap_walk(sap
->attr
.mls
.cat
,
2113 smack_catset_bit(pcat
, smack
);
2116 * If it is CIPSO using smack direct mapping
2117 * we are already done. WeeHee.
2119 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2120 memcpy(sip
, smack
, SMK_MAXLEN
);
2124 * Look it up in the supplied table if it is not a direct mapping.
2126 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2131 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2135 * Returns 0 if the packet should be delivered, an error code otherwise
2137 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2139 struct netlbl_lsm_secattr secattr
;
2140 struct socket_smack
*ssp
= sk
->sk_security
;
2141 char smack
[SMK_LABELLEN
];
2144 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2148 * Translate what netlabel gave us.
2150 memset(smack
, '\0', SMK_LABELLEN
);
2151 netlbl_secattr_init(&secattr
);
2152 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2154 smack_from_secattr(&secattr
, smack
);
2156 strncpy(smack
, smack_net_ambient
, SMK_MAXLEN
);
2157 netlbl_secattr_destroy(&secattr
);
2159 * Receiving a packet requires that the other end
2160 * be able to write here. Read access is not required.
2161 * This is the simplist possible security model
2164 return smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2168 * smack_socket_getpeersec_stream - pull in packet label
2170 * @optval: user's destination
2171 * @optlen: size thereof
2174 * returns zero on success, an error code otherwise
2176 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2177 char __user
*optval
,
2178 int __user
*optlen
, unsigned len
)
2180 struct socket_smack
*ssp
;
2184 ssp
= sock
->sk
->sk_security
;
2185 slen
= strlen(ssp
->smk_packet
) + 1;
2189 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2192 if (put_user(slen
, optlen
) != 0)
2200 * smack_socket_getpeersec_dgram - pull in packet label
2203 * @secid: pointer to where to put the secid of the packet
2205 * Sets the netlabel socket state on sk from parent
2207 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2208 struct sk_buff
*skb
, u32
*secid
)
2211 struct netlbl_lsm_secattr secattr
;
2213 char smack
[SMK_LABELLEN
];
2214 int family
= PF_INET
;
2219 * Only works for families with packets.
2223 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2225 family
= sk
->sk_family
;
2228 * Translate what netlabel gave us.
2230 memset(smack
, '\0', SMK_LABELLEN
);
2231 netlbl_secattr_init(&secattr
);
2232 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2234 smack_from_secattr(&secattr
, smack
);
2235 netlbl_secattr_destroy(&secattr
);
2238 * Give up if we couldn't get anything
2243 s
= smack_to_secid(smack
);
2252 * smack_sock_graft - graft access state between two sockets
2254 * @parent: donor socket
2256 * Sets the netlabel socket state on sk from parent
2258 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2260 struct socket_smack
*ssp
;
2266 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2269 ssp
= sk
->sk_security
;
2270 ssp
->smk_in
= current
->security
;
2271 ssp
->smk_out
= current
->security
;
2272 ssp
->smk_packet
[0] = '\0';
2274 rc
= smack_netlabel(sk
);
2276 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
2281 * smack_inet_conn_request - Smack access check on connect
2282 * @sk: socket involved
2286 * Returns 0 if a task with the packet label could write to
2287 * the socket, otherwise an error code
2289 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2290 struct request_sock
*req
)
2292 struct netlbl_lsm_secattr skb_secattr
;
2293 struct socket_smack
*ssp
= sk
->sk_security
;
2294 char smack
[SMK_LABELLEN
];
2300 memset(smack
, '\0', SMK_LABELLEN
);
2301 netlbl_secattr_init(&skb_secattr
);
2302 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &skb_secattr
);
2304 smack_from_secattr(&skb_secattr
, smack
);
2306 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2307 netlbl_secattr_destroy(&skb_secattr
);
2309 * Receiving a packet requires that the other end
2310 * be able to write here. Read access is not required.
2312 * If the request is successful save the peer's label
2313 * so that SO_PEERCRED can report it.
2315 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2317 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2323 * Key management security hooks
2325 * Casey has not tested key support very heavily.
2326 * The permission check is most likely too restrictive.
2327 * If you care about keys please have a look.
2332 * smack_key_alloc - Set the key security blob
2334 * @tsk: the task associated with the key
2337 * No allocation required
2341 static int smack_key_alloc(struct key
*key
, struct task_struct
*tsk
,
2342 unsigned long flags
)
2344 key
->security
= tsk
->security
;
2349 * smack_key_free - Clear the key security blob
2352 * Clear the blob pointer
2354 static void smack_key_free(struct key
*key
)
2356 key
->security
= NULL
;
2360 * smack_key_permission - Smack access on a key
2361 * @key_ref: gets to the object
2362 * @context: task involved
2365 * Return 0 if the task has read and write to the object,
2366 * an error code otherwise
2368 static int smack_key_permission(key_ref_t key_ref
,
2369 struct task_struct
*context
, key_perm_t perm
)
2373 keyp
= key_ref_to_ptr(key_ref
);
2377 * If the key hasn't been initialized give it access so that
2380 if (keyp
->security
== NULL
)
2383 * This should not occur
2385 if (context
->security
== NULL
)
2388 return smk_access(context
->security
, keyp
->security
, MAY_READWRITE
);
2390 #endif /* CONFIG_KEYS */
2395 * Audit requires a unique representation of each Smack specific
2396 * rule. This unique representation is used to distinguish the
2397 * object to be audited from remaining kernel objects and also
2398 * works as a glue between the audit hooks.
2400 * Since repository entries are added but never deleted, we'll use
2401 * the smack_known label address related to the given audit rule as
2402 * the needed unique representation. This also better fits the smack
2403 * model where nearly everything is a label.
2408 * smack_audit_rule_init - Initialize a smack audit rule
2409 * @field: audit rule fields given from user-space (audit.h)
2410 * @op: required testing operator (=, !=, >, <, ...)
2411 * @rulestr: smack label to be audited
2412 * @vrule: pointer to save our own audit rule representation
2414 * Prepare to audit cases where (@field @op @rulestr) is true.
2415 * The label to be audited is created if necessay.
2417 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2419 char **rule
= (char **)vrule
;
2422 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2425 if (op
!= AUDIT_EQUAL
&& op
!= AUDIT_NOT_EQUAL
)
2428 *rule
= smk_import(rulestr
, 0);
2434 * smack_audit_rule_known - Distinguish Smack audit rules
2435 * @krule: rule of interest, in Audit kernel representation format
2437 * This is used to filter Smack rules from remaining Audit ones.
2438 * If it's proved that this rule belongs to us, the
2439 * audit_rule_match hook will be called to do the final judgement.
2441 static int smack_audit_rule_known(struct audit_krule
*krule
)
2443 struct audit_field
*f
;
2446 for (i
= 0; i
< krule
->field_count
; i
++) {
2447 f
= &krule
->fields
[i
];
2449 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2457 * smack_audit_rule_match - Audit given object ?
2458 * @secid: security id for identifying the object to test
2459 * @field: audit rule flags given from user-space
2460 * @op: required testing operator
2461 * @vrule: smack internal rule presentation
2462 * @actx: audit context associated with the check
2464 * The core Audit hook. It's used to take the decision of
2465 * whether to audit or not to audit a given object.
2467 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2468 struct audit_context
*actx
)
2474 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2475 "Smack: missing rule\n");
2479 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2482 smack
= smack_from_secid(secid
);
2485 * No need to do string comparisons. If a match occurs,
2486 * both pointers will point to the same smack_known
2489 if (op
== AUDIT_EQUAL
)
2490 return (rule
== smack
);
2491 if (op
== AUDIT_NOT_EQUAL
)
2492 return (rule
!= smack
);
2498 * smack_audit_rule_free - free smack rule representation
2499 * @vrule: rule to be freed.
2501 * No memory was allocated.
2503 static void smack_audit_rule_free(void *vrule
)
2508 #endif /* CONFIG_AUDIT */
2511 * smack_secid_to_secctx - return the smack label for a secid
2512 * @secid: incoming integer
2513 * @secdata: destination
2514 * @seclen: how long it is
2516 * Exists for networking code.
2518 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
2520 char *sp
= smack_from_secid(secid
);
2523 *seclen
= strlen(sp
);
2528 * smack_secctx_to_secid - return the secid for a smack label
2529 * @secdata: smack label
2530 * @seclen: how long result is
2531 * @secid: outgoing integer
2533 * Exists for audit and networking code.
2535 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
2537 *secid
= smack_to_secid(secdata
);
2542 * smack_release_secctx - don't do anything.
2547 * Exists to make sure nothing gets done, and properly
2549 static void smack_release_secctx(char *secdata
, u32 seclen
)
2553 struct security_operations smack_ops
= {
2556 .ptrace
= smack_ptrace
,
2557 .capget
= cap_capget
,
2558 .capset_check
= cap_capset_check
,
2559 .capset_set
= cap_capset_set
,
2560 .capable
= cap_capable
,
2561 .syslog
= smack_syslog
,
2562 .settime
= cap_settime
,
2563 .vm_enough_memory
= cap_vm_enough_memory
,
2565 .bprm_apply_creds
= cap_bprm_apply_creds
,
2566 .bprm_set_security
= cap_bprm_set_security
,
2567 .bprm_secureexec
= cap_bprm_secureexec
,
2569 .sb_alloc_security
= smack_sb_alloc_security
,
2570 .sb_free_security
= smack_sb_free_security
,
2571 .sb_copy_data
= smack_sb_copy_data
,
2572 .sb_kern_mount
= smack_sb_kern_mount
,
2573 .sb_statfs
= smack_sb_statfs
,
2574 .sb_mount
= smack_sb_mount
,
2575 .sb_umount
= smack_sb_umount
,
2577 .inode_alloc_security
= smack_inode_alloc_security
,
2578 .inode_free_security
= smack_inode_free_security
,
2579 .inode_init_security
= smack_inode_init_security
,
2580 .inode_link
= smack_inode_link
,
2581 .inode_unlink
= smack_inode_unlink
,
2582 .inode_rmdir
= smack_inode_rmdir
,
2583 .inode_rename
= smack_inode_rename
,
2584 .inode_permission
= smack_inode_permission
,
2585 .inode_setattr
= smack_inode_setattr
,
2586 .inode_getattr
= smack_inode_getattr
,
2587 .inode_setxattr
= smack_inode_setxattr
,
2588 .inode_post_setxattr
= smack_inode_post_setxattr
,
2589 .inode_getxattr
= smack_inode_getxattr
,
2590 .inode_removexattr
= smack_inode_removexattr
,
2591 .inode_need_killpriv
= cap_inode_need_killpriv
,
2592 .inode_killpriv
= cap_inode_killpriv
,
2593 .inode_getsecurity
= smack_inode_getsecurity
,
2594 .inode_setsecurity
= smack_inode_setsecurity
,
2595 .inode_listsecurity
= smack_inode_listsecurity
,
2596 .inode_getsecid
= smack_inode_getsecid
,
2598 .file_permission
= smack_file_permission
,
2599 .file_alloc_security
= smack_file_alloc_security
,
2600 .file_free_security
= smack_file_free_security
,
2601 .file_ioctl
= smack_file_ioctl
,
2602 .file_lock
= smack_file_lock
,
2603 .file_fcntl
= smack_file_fcntl
,
2604 .file_set_fowner
= smack_file_set_fowner
,
2605 .file_send_sigiotask
= smack_file_send_sigiotask
,
2606 .file_receive
= smack_file_receive
,
2608 .task_alloc_security
= smack_task_alloc_security
,
2609 .task_free_security
= smack_task_free_security
,
2610 .task_post_setuid
= cap_task_post_setuid
,
2611 .task_setpgid
= smack_task_setpgid
,
2612 .task_getpgid
= smack_task_getpgid
,
2613 .task_getsid
= smack_task_getsid
,
2614 .task_getsecid
= smack_task_getsecid
,
2615 .task_setnice
= smack_task_setnice
,
2616 .task_setioprio
= smack_task_setioprio
,
2617 .task_getioprio
= smack_task_getioprio
,
2618 .task_setscheduler
= smack_task_setscheduler
,
2619 .task_getscheduler
= smack_task_getscheduler
,
2620 .task_movememory
= smack_task_movememory
,
2621 .task_kill
= smack_task_kill
,
2622 .task_wait
= smack_task_wait
,
2623 .task_reparent_to_init
= cap_task_reparent_to_init
,
2624 .task_to_inode
= smack_task_to_inode
,
2625 .task_prctl
= cap_task_prctl
,
2627 .ipc_permission
= smack_ipc_permission
,
2628 .ipc_getsecid
= smack_ipc_getsecid
,
2630 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
2631 .msg_msg_free_security
= smack_msg_msg_free_security
,
2633 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
2634 .msg_queue_free_security
= smack_msg_queue_free_security
,
2635 .msg_queue_associate
= smack_msg_queue_associate
,
2636 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
2637 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
2638 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
2640 .shm_alloc_security
= smack_shm_alloc_security
,
2641 .shm_free_security
= smack_shm_free_security
,
2642 .shm_associate
= smack_shm_associate
,
2643 .shm_shmctl
= smack_shm_shmctl
,
2644 .shm_shmat
= smack_shm_shmat
,
2646 .sem_alloc_security
= smack_sem_alloc_security
,
2647 .sem_free_security
= smack_sem_free_security
,
2648 .sem_associate
= smack_sem_associate
,
2649 .sem_semctl
= smack_sem_semctl
,
2650 .sem_semop
= smack_sem_semop
,
2652 .netlink_send
= cap_netlink_send
,
2653 .netlink_recv
= cap_netlink_recv
,
2655 .d_instantiate
= smack_d_instantiate
,
2657 .getprocattr
= smack_getprocattr
,
2658 .setprocattr
= smack_setprocattr
,
2660 .unix_stream_connect
= smack_unix_stream_connect
,
2661 .unix_may_send
= smack_unix_may_send
,
2663 .socket_post_create
= smack_socket_post_create
,
2664 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
2665 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
2666 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
2667 .sk_alloc_security
= smack_sk_alloc_security
,
2668 .sk_free_security
= smack_sk_free_security
,
2669 .sock_graft
= smack_sock_graft
,
2670 .inet_conn_request
= smack_inet_conn_request
,
2672 /* key management security hooks */
2674 .key_alloc
= smack_key_alloc
,
2675 .key_free
= smack_key_free
,
2676 .key_permission
= smack_key_permission
,
2677 #endif /* CONFIG_KEYS */
2681 .audit_rule_init
= smack_audit_rule_init
,
2682 .audit_rule_known
= smack_audit_rule_known
,
2683 .audit_rule_match
= smack_audit_rule_match
,
2684 .audit_rule_free
= smack_audit_rule_free
,
2685 #endif /* CONFIG_AUDIT */
2687 .secid_to_secctx
= smack_secid_to_secctx
,
2688 .secctx_to_secid
= smack_secctx_to_secid
,
2689 .release_secctx
= smack_release_secctx
,
2693 * smack_init - initialize the smack system
2697 static __init
int smack_init(void)
2699 if (!security_module_enable(&smack_ops
))
2702 printk(KERN_INFO
"Smack: Initializing.\n");
2705 * Set the security state for the initial task.
2707 current
->security
= &smack_known_floor
.smk_known
;
2712 spin_lock_init(&smack_known_unset
.smk_cipsolock
);
2713 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
2714 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
2715 spin_lock_init(&smack_known_star
.smk_cipsolock
);
2716 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
2717 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
2722 if (register_security(&smack_ops
))
2723 panic("smack: Unable to register with kernel.\n");
2729 * Smack requires early initialization in order to label
2730 * all processes and objects when they are created.
2732 security_initcall(smack_init
);