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>
33 * I hope these are the hokeyist lines of code in the module. Casey.
35 #define DEVPTS_SUPER_MAGIC 0x1cd1
36 #define SOCKFS_MAGIC 0x534F434B
37 #define TMPFS_MAGIC 0x01021994
40 * smk_fetch - Fetch the smack label from a file.
41 * @ip: a pointer to the inode
42 * @dp: a pointer to the dentry
44 * Returns a pointer to the master list entry for the Smack label
45 * or NULL if there was no label to fetch.
47 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
50 char in
[SMK_LABELLEN
];
52 if (ip
->i_op
->getxattr
== NULL
)
55 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
59 return smk_import(in
, rc
);
63 * new_inode_smack - allocate an inode security blob
64 * @smack: a pointer to the Smack label to use in the blob
66 * Returns the new blob or NULL if there's no memory available
68 struct inode_smack
*new_inode_smack(char *smack
)
70 struct inode_smack
*isp
;
72 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
76 isp
->smk_inode
= smack
;
78 mutex_init(&isp
->smk_lock
);
89 * smack_ptrace - Smack approval on ptrace
90 * @ptp: parent task pointer
91 * @ctp: child task pointer
93 * Returns 0 if access is OK, an error code otherwise
95 * Do the capability checks, and require read and write.
97 static int smack_ptrace(struct task_struct
*ptp
, struct task_struct
*ctp
)
101 rc
= cap_ptrace(ptp
, ctp
);
105 rc
= smk_access(ptp
->security
, ctp
->security
, MAY_READWRITE
);
106 if (rc
!= 0 && __capable(ptp
, CAP_MAC_OVERRIDE
))
113 * smack_syslog - Smack approval on syslog
114 * @type: message type
116 * Require that the task has the floor label
118 * Returns 0 on success, error code otherwise.
120 static int smack_syslog(int type
)
123 char *sp
= current
->security
;
125 rc
= cap_syslog(type
);
129 if (capable(CAP_MAC_OVERRIDE
))
132 if (sp
!= smack_known_floor
.smk_known
)
144 * smack_sb_alloc_security - allocate a superblock blob
145 * @sb: the superblock getting the blob
147 * Returns 0 on success or -ENOMEM on error.
149 static int smack_sb_alloc_security(struct super_block
*sb
)
151 struct superblock_smack
*sbsp
;
153 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
158 sbsp
->smk_root
= smack_known_floor
.smk_known
;
159 sbsp
->smk_default
= smack_known_floor
.smk_known
;
160 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
161 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
162 sbsp
->smk_initialized
= 0;
163 spin_lock_init(&sbsp
->smk_sblock
);
165 sb
->s_security
= sbsp
;
171 * smack_sb_free_security - free a superblock blob
172 * @sb: the superblock getting the blob
175 static void smack_sb_free_security(struct super_block
*sb
)
177 kfree(sb
->s_security
);
178 sb
->s_security
= NULL
;
182 * smack_sb_copy_data - copy mount options data for processing
183 * @type: file system type
184 * @orig: where to start
187 * Returns 0 on success or -ENOMEM on error.
189 * Copy the Smack specific mount options out of the mount
192 static int smack_sb_copy_data(struct file_system_type
*type
, void *orig
,
195 char *cp
, *commap
, *otheropts
, *dp
;
197 /* Binary mount data: just copy */
198 if (type
->fs_flags
& FS_BINARY_MOUNTDATA
) {
199 copy_page(smackopts
, orig
);
203 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
204 if (otheropts
== NULL
)
207 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
208 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
210 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
212 else if (strstr(cp
, SMK_FSHAT
) == cp
)
214 else if (strstr(cp
, SMK_FSROOT
) == cp
)
219 commap
= strchr(cp
, ',');
228 strcpy(orig
, otheropts
);
229 free_page((unsigned long)otheropts
);
235 * smack_sb_kern_mount - Smack specific mount processing
236 * @sb: the file system superblock
237 * @data: the smack mount options
239 * Returns 0 on success, an error code on failure
241 static int smack_sb_kern_mount(struct super_block
*sb
, void *data
)
243 struct dentry
*root
= sb
->s_root
;
244 struct inode
*inode
= root
->d_inode
;
245 struct superblock_smack
*sp
= sb
->s_security
;
246 struct inode_smack
*isp
;
251 spin_lock(&sp
->smk_sblock
);
252 if (sp
->smk_initialized
!= 0) {
253 spin_unlock(&sp
->smk_sblock
);
256 sp
->smk_initialized
= 1;
257 spin_unlock(&sp
->smk_sblock
);
259 for (op
= data
; op
!= NULL
; op
= commap
) {
260 commap
= strchr(op
, ',');
264 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
265 op
+= strlen(SMK_FSHAT
);
266 nsp
= smk_import(op
, 0);
269 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
270 op
+= strlen(SMK_FSFLOOR
);
271 nsp
= smk_import(op
, 0);
274 } else if (strncmp(op
, SMK_FSDEFAULT
,
275 strlen(SMK_FSDEFAULT
)) == 0) {
276 op
+= strlen(SMK_FSDEFAULT
);
277 nsp
= smk_import(op
, 0);
279 sp
->smk_default
= nsp
;
280 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
281 op
+= strlen(SMK_FSROOT
);
282 nsp
= smk_import(op
, 0);
289 * Initialize the root inode.
291 isp
= inode
->i_security
;
293 inode
->i_security
= new_inode_smack(sp
->smk_root
);
295 isp
->smk_inode
= sp
->smk_root
;
301 * smack_sb_statfs - Smack check on statfs
302 * @dentry: identifies the file system in question
304 * Returns 0 if current can read the floor of the filesystem,
305 * and error code otherwise
307 static int smack_sb_statfs(struct dentry
*dentry
)
309 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
311 return smk_curacc(sbp
->smk_floor
, MAY_READ
);
315 * smack_sb_mount - Smack check for mounting
322 * Returns 0 if current can write the floor of the filesystem
323 * being mounted on, an error code otherwise.
325 static int smack_sb_mount(char *dev_name
, struct nameidata
*nd
,
326 char *type
, unsigned long flags
, void *data
)
328 struct superblock_smack
*sbp
= nd
->path
.mnt
->mnt_sb
->s_security
;
330 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
334 * smack_sb_umount - Smack check for unmounting
335 * @mnt: file system to unmount
338 * Returns 0 if current can write the floor of the filesystem
339 * being unmounted, an error code otherwise.
341 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
343 struct superblock_smack
*sbp
;
345 sbp
= mnt
->mnt_sb
->s_security
;
347 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
355 * smack_inode_alloc_security - allocate an inode blob
356 * @inode - the inode in need of a blob
358 * Returns 0 if it gets a blob, -ENOMEM otherwise
360 static int smack_inode_alloc_security(struct inode
*inode
)
362 inode
->i_security
= new_inode_smack(current
->security
);
363 if (inode
->i_security
== NULL
)
369 * smack_inode_free_security - free an inode blob
370 * @inode - the inode with a blob
372 * Clears the blob pointer in inode
374 static void smack_inode_free_security(struct inode
*inode
)
376 kfree(inode
->i_security
);
377 inode
->i_security
= NULL
;
381 * smack_inode_init_security - copy out the smack from an inode
384 * @name: where to put the attribute name
385 * @value: where to put the attribute value
386 * @len: where to put the length of the attribute
388 * Returns 0 if it all works out, -ENOMEM if there's no memory
390 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
391 char **name
, void **value
, size_t *len
)
393 char *isp
= smk_of_inode(inode
);
396 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
402 *value
= kstrdup(isp
, GFP_KERNEL
);
408 *len
= strlen(isp
) + 1;
414 * smack_inode_link - Smack check on link
415 * @old_dentry: the existing object
417 * @new_dentry: the new object
419 * Returns 0 if access is permitted, an error code otherwise
421 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
422 struct dentry
*new_dentry
)
427 isp
= smk_of_inode(old_dentry
->d_inode
);
428 rc
= smk_curacc(isp
, MAY_WRITE
);
430 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
431 isp
= smk_of_inode(new_dentry
->d_inode
);
432 rc
= smk_curacc(isp
, MAY_WRITE
);
439 * smack_inode_unlink - Smack check on inode deletion
440 * @dir: containing directory object
441 * @dentry: file to unlink
443 * Returns 0 if current can write the containing directory
444 * and the object, error code otherwise
446 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
448 struct inode
*ip
= dentry
->d_inode
;
452 * You need write access to the thing you're unlinking
454 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
);
457 * You also need write access to the containing directory
459 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
465 * smack_inode_rmdir - Smack check on directory deletion
466 * @dir: containing directory object
467 * @dentry: directory to unlink
469 * Returns 0 if current can write the containing directory
470 * and the directory, error code otherwise
472 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
477 * You need write access to the thing you're removing
479 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
482 * You also need write access to the containing directory
484 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
490 * smack_inode_rename - Smack check on rename
491 * @old_inode: the old directory
492 * @old_dentry: unused
493 * @new_inode: the new directory
494 * @new_dentry: unused
496 * Read and write access is required on both the old and
499 * Returns 0 if access is permitted, an error code otherwise
501 static int smack_inode_rename(struct inode
*old_inode
,
502 struct dentry
*old_dentry
,
503 struct inode
*new_inode
,
504 struct dentry
*new_dentry
)
509 isp
= smk_of_inode(old_dentry
->d_inode
);
510 rc
= smk_curacc(isp
, MAY_READWRITE
);
512 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
513 isp
= smk_of_inode(new_dentry
->d_inode
);
514 rc
= smk_curacc(isp
, MAY_READWRITE
);
521 * smack_inode_permission - Smack version of permission()
522 * @inode: the inode in question
523 * @mask: the access requested
526 * This is the important Smack hook.
528 * Returns 0 if access is permitted, -EACCES otherwise
530 static int smack_inode_permission(struct inode
*inode
, int mask
,
531 struct nameidata
*nd
)
534 * No permission to check. Existence test. Yup, it's there.
539 return smk_curacc(smk_of_inode(inode
), mask
);
543 * smack_inode_setattr - Smack check for setting attributes
544 * @dentry: the object
545 * @iattr: for the force flag
547 * Returns 0 if access is permitted, an error code otherwise
549 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
552 * Need to allow for clearing the setuid bit.
554 if (iattr
->ia_valid
& ATTR_FORCE
)
557 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
561 * smack_inode_getattr - Smack check for getting attributes
563 * @dentry: the object
565 * Returns 0 if access is permitted, an error code otherwise
567 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
569 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
573 * smack_inode_setxattr - Smack check for setting xattrs
574 * @dentry: the object
575 * @name: name of the attribute
580 * This protects the Smack attribute explicitly.
582 * Returns 0 if access is permitted, an error code otherwise
584 static int smack_inode_setxattr(struct dentry
*dentry
, char *name
,
585 void *value
, size_t size
, int flags
)
587 if (!capable(CAP_MAC_ADMIN
)) {
588 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
589 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
590 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0)
594 return 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
, char *name
,
609 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
, 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
, char *name
)
661 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 && !capable(CAP_MAC_ADMIN
))
664 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
668 * smack_inode_getsecurity - get smack xattrs
670 * @name: attribute name
671 * @buffer: where to put the result
672 * @size: size of the buffer
675 * Returns the size of the attribute or an error code
677 static int smack_inode_getsecurity(const struct inode
*inode
,
678 const char *name
, void **buffer
,
681 struct socket_smack
*ssp
;
683 struct super_block
*sbp
;
684 struct inode
*ip
= (struct inode
*)inode
;
689 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
690 isp
= smk_of_inode(inode
);
691 ilen
= strlen(isp
) + 1;
697 * The rest of the Smack xattrs are only on sockets.
700 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
704 if (sock
== NULL
|| sock
->sk
== NULL
)
707 ssp
= sock
->sk
->sk_security
;
709 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
711 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
716 ilen
= strlen(isp
) + 1;
727 * smack_inode_listsecurity - list the Smack attributes
729 * @buffer: where they go
730 * @buffer_size: size of buffer
732 * Returns 0 on success, -EINVAL otherwise
734 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
737 int len
= strlen(XATTR_NAME_SMACK
);
739 if (buffer
!= NULL
&& len
<= buffer_size
) {
740 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
751 * smack_file_permission - Smack check on file operations
757 * Should access checks be done on each read or write?
758 * UNICOS and SELinux say yes.
759 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
761 * I'll say no for now. Smack does not do the frequent
762 * label changing that SELinux does.
764 static int smack_file_permission(struct file
*file
, int mask
)
770 * smack_file_alloc_security - assign a file security blob
773 * The security blob for a file is a pointer to the master
774 * label list, so no allocation is done.
778 static int smack_file_alloc_security(struct file
*file
)
780 file
->f_security
= current
->security
;
785 * smack_file_free_security - clear a file security blob
788 * The security blob for a file is a pointer to the master
789 * label list, so no memory is freed.
791 static void smack_file_free_security(struct file
*file
)
793 file
->f_security
= NULL
;
797 * smack_file_ioctl - Smack check on ioctls
802 * Relies heavily on the correct use of the ioctl command conventions.
804 * Returns 0 if allowed, error code otherwise
806 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
811 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
812 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
814 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
815 rc
= smk_curacc(file
->f_security
, MAY_READ
);
821 * smack_file_lock - Smack check on file locking
825 * Returns 0 if current has write access, error code otherwise
827 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
829 return smk_curacc(file
->f_security
, MAY_WRITE
);
833 * smack_file_fcntl - Smack check on fcntl
835 * @cmd: what action to check
838 * Returns 0 if current has access, error code otherwise
840 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
852 rc
= smk_curacc(file
->f_security
, MAY_READ
);
860 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
863 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
);
870 * smack_file_set_fowner - set the file security blob value
871 * @file: object in question
874 * Further research may be required on this one.
876 static int smack_file_set_fowner(struct file
*file
)
878 file
->f_security
= current
->security
;
883 * smack_file_send_sigiotask - Smack on sigio
884 * @tsk: The target task
885 * @fown: the object the signal come from
888 * Allow a privileged task to get signals even if it shouldn't
890 * Returns 0 if a subject with the object's smack could
891 * write to the task, an error code otherwise.
893 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
894 struct fown_struct
*fown
, int signum
)
900 * struct fown_struct is never outside the context of a struct file
902 file
= container_of(fown
, struct file
, f_owner
);
903 rc
= smk_access(file
->f_security
, tsk
->security
, MAY_WRITE
);
904 if (rc
!= 0 && __capable(tsk
, CAP_MAC_OVERRIDE
))
910 * smack_file_receive - Smack file receive check
913 * Returns 0 if current has access, error code otherwise
915 static int smack_file_receive(struct file
*file
)
920 * This code relies on bitmasks.
922 if (file
->f_mode
& FMODE_READ
)
924 if (file
->f_mode
& FMODE_WRITE
)
927 return smk_curacc(file
->f_security
, may
);
935 * smack_task_alloc_security - "allocate" a task blob
936 * @tsk: the task in need of a blob
938 * Smack isn't using copies of blobs. Everyone
939 * points to an immutable list. No alloc required.
940 * No data copy required.
944 static int smack_task_alloc_security(struct task_struct
*tsk
)
946 tsk
->security
= current
->security
;
952 * smack_task_free_security - "free" a task blob
953 * @task: the task with the blob
955 * Smack isn't using copies of blobs. Everyone
956 * points to an immutable list. The blobs never go away.
957 * There is no leak here.
959 static void smack_task_free_security(struct task_struct
*task
)
961 task
->security
= NULL
;
965 * smack_task_setpgid - Smack check on setting pgid
966 * @p: the task object
969 * Return 0 if write access is permitted
971 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
973 return smk_curacc(p
->security
, MAY_WRITE
);
977 * smack_task_getpgid - Smack access check for getpgid
978 * @p: the object task
980 * Returns 0 if current can read the object task, error code otherwise
982 static int smack_task_getpgid(struct task_struct
*p
)
984 return smk_curacc(p
->security
, MAY_READ
);
988 * smack_task_getsid - Smack access check for getsid
989 * @p: the object task
991 * Returns 0 if current can read the object task, error code otherwise
993 static int smack_task_getsid(struct task_struct
*p
)
995 return smk_curacc(p
->security
, MAY_READ
);
999 * smack_task_getsecid - get the secid of the task
1000 * @p: the object task
1001 * @secid: where to put the result
1003 * Sets the secid to contain a u32 version of the smack label.
1005 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1007 *secid
= smack_to_secid(p
->security
);
1011 * smack_task_setnice - Smack check on setting nice
1012 * @p: the task object
1015 * Return 0 if write access is permitted
1017 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1019 return smk_curacc(p
->security
, MAY_WRITE
);
1023 * smack_task_setioprio - Smack check on setting ioprio
1024 * @p: the task object
1027 * Return 0 if write access is permitted
1029 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1031 return smk_curacc(p
->security
, MAY_WRITE
);
1035 * smack_task_getioprio - Smack check on reading ioprio
1036 * @p: the task object
1038 * Return 0 if read access is permitted
1040 static int smack_task_getioprio(struct task_struct
*p
)
1042 return smk_curacc(p
->security
, MAY_READ
);
1046 * smack_task_setscheduler - Smack check on setting scheduler
1047 * @p: the task object
1051 * Return 0 if read access is permitted
1053 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1054 struct sched_param
*lp
)
1056 return smk_curacc(p
->security
, MAY_WRITE
);
1060 * smack_task_getscheduler - Smack check on reading scheduler
1061 * @p: the task object
1063 * Return 0 if read access is permitted
1065 static int smack_task_getscheduler(struct task_struct
*p
)
1067 return smk_curacc(p
->security
, MAY_READ
);
1071 * smack_task_movememory - Smack check on moving memory
1072 * @p: the task object
1074 * Return 0 if write access is permitted
1076 static int smack_task_movememory(struct task_struct
*p
)
1078 return smk_curacc(p
->security
, MAY_WRITE
);
1082 * smack_task_kill - Smack check on signal delivery
1083 * @p: the task object
1086 * @secid: identifies the smack to use in lieu of current's
1088 * Return 0 if write access is permitted
1090 * The secid behavior is an artifact of an SELinux hack
1091 * in the USB code. Someday it may go away.
1093 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1097 * Special cases where signals really ought to go through
1098 * in spite of policy. Stephen Smalley suggests it may
1099 * make sense to change the caller so that it doesn't
1100 * bother with the LSM hook in these cases.
1102 if (info
!= SEND_SIG_NOINFO
&&
1103 (is_si_special(info
) || SI_FROMKERNEL(info
)))
1106 * Sending a signal requires that the sender
1107 * can write the receiver.
1110 return smk_curacc(p
->security
, MAY_WRITE
);
1112 * If the secid isn't 0 we're dealing with some USB IO
1113 * specific behavior. This is not clean. For one thing
1114 * we can't take privilege into account.
1116 return smk_access(smack_from_secid(secid
), p
->security
, MAY_WRITE
);
1120 * smack_task_wait - Smack access check for waiting
1121 * @p: task to wait for
1123 * Returns 0 if current can wait for p, error code otherwise
1125 static int smack_task_wait(struct task_struct
*p
)
1129 rc
= smk_access(current
->security
, p
->security
, MAY_WRITE
);
1134 * Allow the operation to succeed if either task
1135 * has privilege to perform operations that might
1136 * account for the smack labels having gotten to
1137 * be different in the first place.
1139 * This breaks the strict subjet/object access
1140 * control ideal, taking the object's privilege
1141 * state into account in the decision as well as
1144 if (capable(CAP_MAC_OVERRIDE
) || __capable(p
, CAP_MAC_OVERRIDE
))
1151 * smack_task_to_inode - copy task smack into the inode blob
1152 * @p: task to copy from
1153 * inode: inode to copy to
1155 * Sets the smack pointer in the inode security blob
1157 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1159 struct inode_smack
*isp
= inode
->i_security
;
1160 isp
->smk_inode
= p
->security
;
1168 * smack_sk_alloc_security - Allocate a socket blob
1171 * @priority: memory allocation priority
1173 * Assign Smack pointers to current
1175 * Returns 0 on success, -ENOMEM is there's no memory
1177 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1179 char *csp
= current
->security
;
1180 struct socket_smack
*ssp
;
1182 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1188 ssp
->smk_packet
[0] = '\0';
1190 sk
->sk_security
= ssp
;
1196 * smack_sk_free_security - Free a socket blob
1199 * Clears the blob pointer
1201 static void smack_sk_free_security(struct sock
*sk
)
1203 kfree(sk
->sk_security
);
1207 * smack_set_catset - convert a capset to netlabel mls categories
1208 * @catset: the Smack categories
1209 * @sap: where to put the netlabel categories
1211 * Allocates and fills attr.mls.cat
1213 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1224 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1225 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1226 sap
->attr
.mls
.cat
->startbit
= 0;
1228 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1229 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1232 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1238 * smack_to_secattr - fill a secattr from a smack value
1239 * @smack: the smack value
1240 * @nlsp: where the result goes
1242 * Casey says that CIPSO is good enough for now.
1243 * It can be used to effect.
1244 * It can also be abused to effect when necessary.
1245 * Appologies to the TSIG group in general and GW in particular.
1247 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1249 struct smack_cipso cipso
;
1252 switch (smack_net_nltype
) {
1253 case NETLBL_NLTYPE_CIPSOV4
:
1254 nlsp
->domain
= kstrdup(smack
, GFP_ATOMIC
);
1255 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1257 rc
= smack_to_cipso(smack
, &cipso
);
1259 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1260 smack_set_catset(cipso
.smk_catset
, nlsp
);
1262 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1263 smack_set_catset(smack
, nlsp
);
1272 * smack_netlabel - Set the secattr on a socket
1275 * Convert the outbound smack value (smk_out) to a
1276 * secattr and attach it to the socket.
1278 * Returns 0 on success or an error code
1280 static int smack_netlabel(struct sock
*sk
)
1282 struct socket_smack
*ssp
;
1283 struct netlbl_lsm_secattr secattr
;
1286 ssp
= sk
->sk_security
;
1287 netlbl_secattr_init(&secattr
);
1288 smack_to_secattr(ssp
->smk_out
, &secattr
);
1289 rc
= netlbl_sock_setattr(sk
, &secattr
);
1290 netlbl_secattr_destroy(&secattr
);
1296 * smack_inode_setsecurity - set smack xattrs
1297 * @inode: the object
1298 * @name: attribute name
1299 * @value: attribute value
1300 * @size: size of the attribute
1303 * Sets the named attribute in the appropriate blob
1305 * Returns 0 on success, or an error code
1307 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1308 const void *value
, size_t size
, int flags
)
1311 struct inode_smack
*nsp
= inode
->i_security
;
1312 struct socket_smack
*ssp
;
1313 struct socket
*sock
;
1316 if (value
== NULL
|| size
> SMK_LABELLEN
)
1319 sp
= smk_import(value
, size
);
1323 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1324 nsp
->smk_inode
= sp
;
1328 * The rest of the Smack xattrs are only on sockets.
1330 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1333 sock
= SOCKET_I(inode
);
1334 if (sock
== NULL
|| sock
->sk
== NULL
)
1337 ssp
= sock
->sk
->sk_security
;
1339 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1341 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1343 rc
= smack_netlabel(sock
->sk
);
1345 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1354 * smack_socket_post_create - finish socket setup
1356 * @family: protocol family
1361 * Sets the netlabel information on the socket
1363 * Returns 0 on success, and error code otherwise
1365 static int smack_socket_post_create(struct socket
*sock
, int family
,
1366 int type
, int protocol
, int kern
)
1368 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1371 * Set the outbound netlbl.
1373 return smack_netlabel(sock
->sk
);
1377 * smack_flags_to_may - convert S_ to MAY_ values
1378 * @flags: the S_ value
1380 * Returns the equivalent MAY_ value
1382 static int smack_flags_to_may(int flags
)
1386 if (flags
& S_IRUGO
)
1388 if (flags
& S_IWUGO
)
1390 if (flags
& S_IXUGO
)
1397 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1402 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1404 msg
->security
= current
->security
;
1409 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1412 * Clears the blob pointer
1414 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1416 msg
->security
= NULL
;
1420 * smack_of_shm - the smack pointer for the shm
1423 * Returns a pointer to the smack value
1425 static char *smack_of_shm(struct shmid_kernel
*shp
)
1427 return (char *)shp
->shm_perm
.security
;
1431 * smack_shm_alloc_security - Set the security blob for shm
1436 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1438 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1440 isp
->security
= current
->security
;
1445 * smack_shm_free_security - Clear the security blob for shm
1448 * Clears the blob pointer
1450 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1452 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1454 isp
->security
= NULL
;
1458 * smack_shm_associate - Smack access check for shm
1460 * @shmflg: access requested
1462 * Returns 0 if current has the requested access, error code otherwise
1464 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1466 char *ssp
= smack_of_shm(shp
);
1469 may
= smack_flags_to_may(shmflg
);
1470 return smk_curacc(ssp
, may
);
1474 * smack_shm_shmctl - Smack access check for shm
1476 * @cmd: what it wants to do
1478 * Returns 0 if current has the requested access, error code otherwise
1480 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1482 char *ssp
= smack_of_shm(shp
);
1494 may
= MAY_READWRITE
;
1499 * System level information.
1506 return smk_curacc(ssp
, may
);
1510 * smack_shm_shmat - Smack access for shmat
1513 * @shmflg: access requested
1515 * Returns 0 if current has the requested access, error code otherwise
1517 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1520 char *ssp
= smack_of_shm(shp
);
1523 may
= smack_flags_to_may(shmflg
);
1524 return smk_curacc(ssp
, may
);
1528 * smack_of_sem - the smack pointer for the sem
1531 * Returns a pointer to the smack value
1533 static char *smack_of_sem(struct sem_array
*sma
)
1535 return (char *)sma
->sem_perm
.security
;
1539 * smack_sem_alloc_security - Set the security blob for sem
1544 static int smack_sem_alloc_security(struct sem_array
*sma
)
1546 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1548 isp
->security
= current
->security
;
1553 * smack_sem_free_security - Clear the security blob for sem
1556 * Clears the blob pointer
1558 static void smack_sem_free_security(struct sem_array
*sma
)
1560 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1562 isp
->security
= NULL
;
1566 * smack_sem_associate - Smack access check for sem
1568 * @semflg: access requested
1570 * Returns 0 if current has the requested access, error code otherwise
1572 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1574 char *ssp
= smack_of_sem(sma
);
1577 may
= smack_flags_to_may(semflg
);
1578 return smk_curacc(ssp
, may
);
1582 * smack_sem_shmctl - Smack access check for sem
1584 * @cmd: what it wants to do
1586 * Returns 0 if current has the requested access, error code otherwise
1588 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1590 char *ssp
= smack_of_sem(sma
);
1607 may
= MAY_READWRITE
;
1612 * System level information
1619 return smk_curacc(ssp
, may
);
1623 * smack_sem_semop - Smack checks of semaphore operations
1629 * Treated as read and write in all cases.
1631 * Returns 0 if access is allowed, error code otherwise
1633 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
1634 unsigned nsops
, int alter
)
1636 char *ssp
= smack_of_sem(sma
);
1638 return smk_curacc(ssp
, MAY_READWRITE
);
1642 * smack_msg_alloc_security - Set the security blob for msg
1647 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
1649 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1651 kisp
->security
= current
->security
;
1656 * smack_msg_free_security - Clear the security blob for msg
1659 * Clears the blob pointer
1661 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
1663 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1665 kisp
->security
= NULL
;
1669 * smack_of_msq - the smack pointer for the msq
1672 * Returns a pointer to the smack value
1674 static char *smack_of_msq(struct msg_queue
*msq
)
1676 return (char *)msq
->q_perm
.security
;
1680 * smack_msg_queue_associate - Smack access check for msg_queue
1682 * @msqflg: access requested
1684 * Returns 0 if current has the requested access, error code otherwise
1686 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
1688 char *msp
= smack_of_msq(msq
);
1691 may
= smack_flags_to_may(msqflg
);
1692 return smk_curacc(msp
, may
);
1696 * smack_msg_queue_msgctl - Smack access check for msg_queue
1698 * @cmd: what it wants to do
1700 * Returns 0 if current has the requested access, error code otherwise
1702 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
1704 char *msp
= smack_of_msq(msq
);
1714 may
= MAY_READWRITE
;
1719 * System level information
1726 return smk_curacc(msp
, may
);
1730 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1733 * @msqflg: access requested
1735 * Returns 0 if current has the requested access, error code otherwise
1737 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
1740 char *msp
= smack_of_msq(msq
);
1743 rc
= smack_flags_to_may(msqflg
);
1744 return smk_curacc(msp
, rc
);
1748 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1755 * Returns 0 if current has read and write access, error code otherwise
1757 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
1758 struct task_struct
*target
, long type
, int mode
)
1760 char *msp
= smack_of_msq(msq
);
1762 return smk_curacc(msp
, MAY_READWRITE
);
1766 * smack_ipc_permission - Smack access for ipc_permission()
1767 * @ipp: the object permissions
1768 * @flag: access requested
1770 * Returns 0 if current has read and write access, error code otherwise
1772 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
1774 char *isp
= ipp
->security
;
1777 may
= smack_flags_to_may(flag
);
1778 return smk_curacc(isp
, may
);
1782 * smack_d_instantiate - Make sure the blob is correct on an inode
1783 * @opt_dentry: unused
1784 * @inode: the object
1786 * Set the inode's security blob if it hasn't been done already.
1788 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
1790 struct super_block
*sbp
;
1791 struct superblock_smack
*sbsp
;
1792 struct inode_smack
*isp
;
1793 char *csp
= current
->security
;
1801 isp
= inode
->i_security
;
1803 mutex_lock(&isp
->smk_lock
);
1805 * If the inode is already instantiated
1806 * take the quick way out
1808 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
1812 sbsp
= sbp
->s_security
;
1814 * We're going to use the superblock default label
1815 * if there's no label on the file.
1817 final
= sbsp
->smk_default
;
1820 * This is pretty hackish.
1821 * Casey says that we shouldn't have to do
1822 * file system specific code, but it does help
1823 * with keeping it simple.
1825 switch (sbp
->s_magic
) {
1828 * Casey says that it's a little embarassing
1829 * that the smack file system doesn't do
1830 * extended attributes.
1832 final
= smack_known_star
.smk_known
;
1836 * Casey says pipes are easy (?)
1838 final
= smack_known_star
.smk_known
;
1840 case DEVPTS_SUPER_MAGIC
:
1842 * devpts seems content with the label of the task.
1843 * Programs that change smack have to treat the
1850 * Casey says sockets get the smack of the task.
1854 case PROC_SUPER_MAGIC
:
1856 * Casey says procfs appears not to care.
1857 * The superblock default suffices.
1862 * Device labels should come from the filesystem,
1863 * but watch out, because they're volitile,
1864 * getting recreated on every reboot.
1866 final
= smack_known_star
.smk_known
;
1870 * If a smack value has been set we want to use it,
1871 * but since tmpfs isn't giving us the opportunity
1872 * to set mount options simulate setting the
1873 * superblock default.
1877 * This isn't an understood special case.
1878 * Get the value from the xattr.
1880 * No xattr support means, alas, no SMACK label.
1881 * Use the aforeapplied default.
1882 * It would be curious if the label of the task
1883 * does not match that assigned.
1885 if (inode
->i_op
->getxattr
== NULL
)
1888 * Get the dentry for xattr.
1890 if (opt_dentry
== NULL
) {
1891 dp
= d_find_alias(inode
);
1895 dp
= dget(opt_dentry
);
1900 fetched
= smk_fetch(inode
, dp
);
1901 if (fetched
!= NULL
)
1909 isp
->smk_inode
= csp
;
1911 isp
->smk_inode
= final
;
1913 isp
->smk_flags
|= SMK_INODE_INSTANT
;
1916 mutex_unlock(&isp
->smk_lock
);
1921 * smack_getprocattr - Smack process attribute access
1922 * @p: the object task
1923 * @name: the name of the attribute in /proc/.../attr
1924 * @value: where to put the result
1926 * Places a copy of the task Smack into value
1928 * Returns the length of the smack label or an error code
1930 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
1935 if (strcmp(name
, "current") != 0)
1938 cp
= kstrdup(p
->security
, GFP_KERNEL
);
1948 * smack_setprocattr - Smack process attribute setting
1949 * @p: the object task
1950 * @name: the name of the attribute in /proc/.../attr
1951 * @value: the value to set
1952 * @size: the size of the value
1954 * Sets the Smack value of the task. Only setting self
1955 * is permitted and only with privilege
1957 * Returns the length of the smack label or an error code
1959 static int smack_setprocattr(struct task_struct
*p
, char *name
,
1960 void *value
, size_t size
)
1964 if (!__capable(p
, CAP_MAC_ADMIN
))
1968 * Changing another process' Smack value is too dangerous
1969 * and supports no sane use case.
1974 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
1977 if (strcmp(name
, "current") != 0)
1980 newsmack
= smk_import(value
, size
);
1981 if (newsmack
== NULL
)
1984 p
->security
= newsmack
;
1989 * smack_unix_stream_connect - Smack access on UDS
1991 * @other: the other socket
1994 * Return 0 if a subject with the smack of sock could access
1995 * an object with the smack of other, otherwise an error code
1997 static int smack_unix_stream_connect(struct socket
*sock
,
1998 struct socket
*other
, struct sock
*newsk
)
2000 struct inode
*sp
= SOCK_INODE(sock
);
2001 struct inode
*op
= SOCK_INODE(other
);
2003 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_READWRITE
);
2007 * smack_unix_may_send - Smack access on UDS
2009 * @other: the other socket
2011 * Return 0 if a subject with the smack of sock could access
2012 * an object with the smack of other, otherwise an error code
2014 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2016 struct inode
*sp
= SOCK_INODE(sock
);
2017 struct inode
*op
= SOCK_INODE(other
);
2019 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
);
2023 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2025 * @sap: netlabel secattr
2026 * @sip: where to put the result
2028 * Copies a smack label into sip
2030 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2032 char smack
[SMK_LABELLEN
];
2035 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) == 0) {
2037 * If there are flags but no level netlabel isn't
2038 * behaving the way we expect it to.
2040 * Without guidance regarding the smack value
2041 * for the packet fall back on the network
2044 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2048 * Get the categories, if any
2050 memset(smack
, '\0', SMK_LABELLEN
);
2051 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2053 pcat
= netlbl_secattr_catmap_walk(sap
->attr
.mls
.cat
,
2057 smack_catset_bit(pcat
, smack
);
2060 * If it is CIPSO using smack direct mapping
2061 * we are already done. WeeHee.
2063 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2064 memcpy(sip
, smack
, SMK_MAXLEN
);
2068 * Look it up in the supplied table if it is not a direct mapping.
2070 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2075 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2079 * Returns 0 if the packet should be delivered, an error code otherwise
2081 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2083 struct netlbl_lsm_secattr secattr
;
2084 struct socket_smack
*ssp
= sk
->sk_security
;
2085 char smack
[SMK_LABELLEN
];
2088 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2092 * Translate what netlabel gave us.
2094 memset(smack
, '\0', SMK_LABELLEN
);
2095 netlbl_secattr_init(&secattr
);
2096 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2098 smack_from_secattr(&secattr
, smack
);
2100 strncpy(smack
, smack_net_ambient
, SMK_MAXLEN
);
2101 netlbl_secattr_destroy(&secattr
);
2103 * Receiving a packet requires that the other end
2104 * be able to write here. Read access is not required.
2105 * This is the simplist possible security model
2108 return smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2112 * smack_socket_getpeersec_stream - pull in packet label
2114 * @optval: user's destination
2115 * @optlen: size thereof
2118 * returns zero on success, an error code otherwise
2120 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2121 char __user
*optval
,
2122 int __user
*optlen
, unsigned len
)
2124 struct socket_smack
*ssp
;
2128 ssp
= sock
->sk
->sk_security
;
2129 slen
= strlen(ssp
->smk_packet
) + 1;
2133 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2136 if (put_user(slen
, optlen
) != 0)
2144 * smack_socket_getpeersec_dgram - pull in packet label
2147 * @secid: pointer to where to put the secid of the packet
2149 * Sets the netlabel socket state on sk from parent
2151 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2152 struct sk_buff
*skb
, u32
*secid
)
2155 struct netlbl_lsm_secattr secattr
;
2157 char smack
[SMK_LABELLEN
];
2158 int family
= PF_INET
;
2163 * Only works for families with packets.
2167 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2169 family
= sk
->sk_family
;
2172 * Translate what netlabel gave us.
2174 memset(smack
, '\0', SMK_LABELLEN
);
2175 netlbl_secattr_init(&secattr
);
2176 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2178 smack_from_secattr(&secattr
, smack
);
2179 netlbl_secattr_destroy(&secattr
);
2182 * Give up if we couldn't get anything
2187 s
= smack_to_secid(smack
);
2196 * smack_sock_graft - graft access state between two sockets
2198 * @parent: donor socket
2200 * Sets the netlabel socket state on sk from parent
2202 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2204 struct socket_smack
*ssp
;
2210 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2213 ssp
= sk
->sk_security
;
2214 ssp
->smk_in
= current
->security
;
2215 ssp
->smk_out
= current
->security
;
2216 ssp
->smk_packet
[0] = '\0';
2218 rc
= smack_netlabel(sk
);
2220 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
2225 * smack_inet_conn_request - Smack access check on connect
2226 * @sk: socket involved
2230 * Returns 0 if a task with the packet label could write to
2231 * the socket, otherwise an error code
2233 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2234 struct request_sock
*req
)
2236 struct netlbl_lsm_secattr skb_secattr
;
2237 struct socket_smack
*ssp
= sk
->sk_security
;
2238 char smack
[SMK_LABELLEN
];
2244 memset(smack
, '\0', SMK_LABELLEN
);
2245 netlbl_secattr_init(&skb_secattr
);
2246 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &skb_secattr
);
2248 smack_from_secattr(&skb_secattr
, smack
);
2250 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2251 netlbl_secattr_destroy(&skb_secattr
);
2253 * Receiving a packet requires that the other end
2254 * be able to write here. Read access is not required.
2256 * If the request is successful save the peer's label
2257 * so that SO_PEERCRED can report it.
2259 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2261 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2267 * Key management security hooks
2269 * Casey has not tested key support very heavily.
2270 * The permission check is most likely too restrictive.
2271 * If you care about keys please have a look.
2276 * smack_key_alloc - Set the key security blob
2278 * @tsk: the task associated with the key
2281 * No allocation required
2285 static int smack_key_alloc(struct key
*key
, struct task_struct
*tsk
,
2286 unsigned long flags
)
2288 key
->security
= tsk
->security
;
2293 * smack_key_free - Clear the key security blob
2296 * Clear the blob pointer
2298 static void smack_key_free(struct key
*key
)
2300 key
->security
= NULL
;
2304 * smack_key_permission - Smack access on a key
2305 * @key_ref: gets to the object
2306 * @context: task involved
2309 * Return 0 if the task has read and write to the object,
2310 * an error code otherwise
2312 static int smack_key_permission(key_ref_t key_ref
,
2313 struct task_struct
*context
, key_perm_t perm
)
2317 keyp
= key_ref_to_ptr(key_ref
);
2321 * If the key hasn't been initialized give it access so that
2324 if (keyp
->security
== NULL
)
2327 * This should not occur
2329 if (context
->security
== NULL
)
2332 return smk_access(context
->security
, keyp
->security
, MAY_READWRITE
);
2334 #endif /* CONFIG_KEYS */
2337 * smack_secid_to_secctx - return the smack label for a secid
2338 * @secid: incoming integer
2339 * @secdata: destination
2340 * @seclen: how long it is
2342 * Exists for networking code.
2344 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
2346 char *sp
= smack_from_secid(secid
);
2349 *seclen
= strlen(sp
);
2354 * smack_secctx_to_secid - return the secid for a smack label
2355 * @secdata: smack label
2356 * @seclen: how long result is
2357 * @secid: outgoing integer
2359 * Exists for audit and networking code.
2361 static int smack_secctx_to_secid(char *secdata
, u32 seclen
, u32
*secid
)
2363 *secid
= smack_to_secid(secdata
);
2368 * smack_release_secctx - don't do anything.
2373 * Exists to make sure nothing gets done, and properly
2375 static void smack_release_secctx(char *secdata
, u32 seclen
)
2379 static struct security_operations smack_ops
= {
2380 .ptrace
= smack_ptrace
,
2381 .capget
= cap_capget
,
2382 .capset_check
= cap_capset_check
,
2383 .capset_set
= cap_capset_set
,
2384 .capable
= cap_capable
,
2385 .syslog
= smack_syslog
,
2386 .settime
= cap_settime
,
2387 .vm_enough_memory
= cap_vm_enough_memory
,
2389 .bprm_apply_creds
= cap_bprm_apply_creds
,
2390 .bprm_set_security
= cap_bprm_set_security
,
2391 .bprm_secureexec
= cap_bprm_secureexec
,
2393 .sb_alloc_security
= smack_sb_alloc_security
,
2394 .sb_free_security
= smack_sb_free_security
,
2395 .sb_copy_data
= smack_sb_copy_data
,
2396 .sb_kern_mount
= smack_sb_kern_mount
,
2397 .sb_statfs
= smack_sb_statfs
,
2398 .sb_mount
= smack_sb_mount
,
2399 .sb_umount
= smack_sb_umount
,
2401 .inode_alloc_security
= smack_inode_alloc_security
,
2402 .inode_free_security
= smack_inode_free_security
,
2403 .inode_init_security
= smack_inode_init_security
,
2404 .inode_link
= smack_inode_link
,
2405 .inode_unlink
= smack_inode_unlink
,
2406 .inode_rmdir
= smack_inode_rmdir
,
2407 .inode_rename
= smack_inode_rename
,
2408 .inode_permission
= smack_inode_permission
,
2409 .inode_setattr
= smack_inode_setattr
,
2410 .inode_getattr
= smack_inode_getattr
,
2411 .inode_setxattr
= smack_inode_setxattr
,
2412 .inode_post_setxattr
= smack_inode_post_setxattr
,
2413 .inode_getxattr
= smack_inode_getxattr
,
2414 .inode_removexattr
= smack_inode_removexattr
,
2415 .inode_getsecurity
= smack_inode_getsecurity
,
2416 .inode_setsecurity
= smack_inode_setsecurity
,
2417 .inode_listsecurity
= smack_inode_listsecurity
,
2419 .file_permission
= smack_file_permission
,
2420 .file_alloc_security
= smack_file_alloc_security
,
2421 .file_free_security
= smack_file_free_security
,
2422 .file_ioctl
= smack_file_ioctl
,
2423 .file_lock
= smack_file_lock
,
2424 .file_fcntl
= smack_file_fcntl
,
2425 .file_set_fowner
= smack_file_set_fowner
,
2426 .file_send_sigiotask
= smack_file_send_sigiotask
,
2427 .file_receive
= smack_file_receive
,
2429 .task_alloc_security
= smack_task_alloc_security
,
2430 .task_free_security
= smack_task_free_security
,
2431 .task_post_setuid
= cap_task_post_setuid
,
2432 .task_setpgid
= smack_task_setpgid
,
2433 .task_getpgid
= smack_task_getpgid
,
2434 .task_getsid
= smack_task_getsid
,
2435 .task_getsecid
= smack_task_getsecid
,
2436 .task_setnice
= smack_task_setnice
,
2437 .task_setioprio
= smack_task_setioprio
,
2438 .task_getioprio
= smack_task_getioprio
,
2439 .task_setscheduler
= smack_task_setscheduler
,
2440 .task_getscheduler
= smack_task_getscheduler
,
2441 .task_movememory
= smack_task_movememory
,
2442 .task_kill
= smack_task_kill
,
2443 .task_wait
= smack_task_wait
,
2444 .task_reparent_to_init
= cap_task_reparent_to_init
,
2445 .task_to_inode
= smack_task_to_inode
,
2447 .ipc_permission
= smack_ipc_permission
,
2449 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
2450 .msg_msg_free_security
= smack_msg_msg_free_security
,
2452 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
2453 .msg_queue_free_security
= smack_msg_queue_free_security
,
2454 .msg_queue_associate
= smack_msg_queue_associate
,
2455 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
2456 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
2457 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
2459 .shm_alloc_security
= smack_shm_alloc_security
,
2460 .shm_free_security
= smack_shm_free_security
,
2461 .shm_associate
= smack_shm_associate
,
2462 .shm_shmctl
= smack_shm_shmctl
,
2463 .shm_shmat
= smack_shm_shmat
,
2465 .sem_alloc_security
= smack_sem_alloc_security
,
2466 .sem_free_security
= smack_sem_free_security
,
2467 .sem_associate
= smack_sem_associate
,
2468 .sem_semctl
= smack_sem_semctl
,
2469 .sem_semop
= smack_sem_semop
,
2471 .netlink_send
= cap_netlink_send
,
2472 .netlink_recv
= cap_netlink_recv
,
2474 .d_instantiate
= smack_d_instantiate
,
2476 .getprocattr
= smack_getprocattr
,
2477 .setprocattr
= smack_setprocattr
,
2479 .unix_stream_connect
= smack_unix_stream_connect
,
2480 .unix_may_send
= smack_unix_may_send
,
2482 .socket_post_create
= smack_socket_post_create
,
2483 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
2484 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
2485 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
2486 .sk_alloc_security
= smack_sk_alloc_security
,
2487 .sk_free_security
= smack_sk_free_security
,
2488 .sock_graft
= smack_sock_graft
,
2489 .inet_conn_request
= smack_inet_conn_request
,
2490 /* key management security hooks */
2492 .key_alloc
= smack_key_alloc
,
2493 .key_free
= smack_key_free
,
2494 .key_permission
= smack_key_permission
,
2495 #endif /* CONFIG_KEYS */
2496 .secid_to_secctx
= smack_secid_to_secctx
,
2497 .secctx_to_secid
= smack_secctx_to_secid
,
2498 .release_secctx
= smack_release_secctx
,
2502 * smack_init - initialize the smack system
2506 static __init
int smack_init(void)
2508 printk(KERN_INFO
"Smack: Initializing.\n");
2511 * Set the security state for the initial task.
2513 current
->security
= &smack_known_floor
.smk_known
;
2518 spin_lock_init(&smack_known_unset
.smk_cipsolock
);
2519 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
2520 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
2521 spin_lock_init(&smack_known_star
.smk_cipsolock
);
2522 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
2523 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
2528 if (register_security(&smack_ops
))
2529 panic("smack: Unable to register with kernel.\n");
2535 * Smack requires early initialization in order to label
2536 * all processes and objects when they are created.
2538 security_initcall(smack_init
);