2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2,
13 * as published by the Free Software Foundation.
16 #include <linux/xattr.h>
17 #include <linux/pagemap.h>
18 #include <linux/mount.h>
19 #include <linux/stat.h>
20 #include <linux/ext2_fs.h>
22 #include <asm/ioctls.h>
23 #include <linux/tcp.h>
24 #include <linux/udp.h>
25 #include <linux/mutex.h>
26 #include <linux/pipe_fs_i.h>
27 #include <net/netlabel.h>
28 #include <net/cipso_ipv4.h>
29 #include <linux/audit.h>
33 #define task_security(task) (task_cred_xxx((task), security))
36 * I hope these are the hokeyist lines of code in the module. Casey.
38 #define DEVPTS_SUPER_MAGIC 0x1cd1
39 #define SOCKFS_MAGIC 0x534F434B
40 #define TMPFS_MAGIC 0x01021994
43 * smk_fetch - Fetch the smack label from a file.
44 * @ip: a pointer to the inode
45 * @dp: a pointer to the dentry
47 * Returns a pointer to the master list entry for the Smack label
48 * or NULL if there was no label to fetch.
50 static char *smk_fetch(struct inode
*ip
, struct dentry
*dp
)
53 char in
[SMK_LABELLEN
];
55 if (ip
->i_op
->getxattr
== NULL
)
58 rc
= ip
->i_op
->getxattr(dp
, XATTR_NAME_SMACK
, in
, SMK_LABELLEN
);
62 return smk_import(in
, rc
);
66 * new_inode_smack - allocate an inode security blob
67 * @smack: a pointer to the Smack label to use in the blob
69 * Returns the new blob or NULL if there's no memory available
71 struct inode_smack
*new_inode_smack(char *smack
)
73 struct inode_smack
*isp
;
75 isp
= kzalloc(sizeof(struct inode_smack
), GFP_KERNEL
);
79 isp
->smk_inode
= smack
;
81 mutex_init(&isp
->smk_lock
);
92 * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH
93 * @ctp: child task pointer
95 * Returns 0 if access is OK, an error code otherwise
97 * Do the capability checks, and require read and write.
99 static int smack_ptrace_may_access(struct task_struct
*ctp
, unsigned int mode
)
103 rc
= cap_ptrace_may_access(ctp
, mode
);
107 rc
= smk_access(current_security(), task_security(ctp
), MAY_READWRITE
);
108 if (rc
!= 0 && capable(CAP_MAC_OVERRIDE
))
114 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
115 * @ptp: parent task pointer
117 * Returns 0 if access is OK, an error code otherwise
119 * Do the capability checks, and require read and write.
121 static int smack_ptrace_traceme(struct task_struct
*ptp
)
125 rc
= cap_ptrace_traceme(ptp
);
129 rc
= smk_access(task_security(ptp
), current_security(), MAY_READWRITE
);
130 if (rc
!= 0 && has_capability(ptp
, CAP_MAC_OVERRIDE
))
136 * smack_syslog - Smack approval on syslog
137 * @type: message type
139 * Require that the task has the floor label
141 * Returns 0 on success, error code otherwise.
143 static int smack_syslog(int type
)
146 char *sp
= current_security();
148 rc
= cap_syslog(type
);
152 if (capable(CAP_MAC_OVERRIDE
))
155 if (sp
!= smack_known_floor
.smk_known
)
167 * smack_sb_alloc_security - allocate a superblock blob
168 * @sb: the superblock getting the blob
170 * Returns 0 on success or -ENOMEM on error.
172 static int smack_sb_alloc_security(struct super_block
*sb
)
174 struct superblock_smack
*sbsp
;
176 sbsp
= kzalloc(sizeof(struct superblock_smack
), GFP_KERNEL
);
181 sbsp
->smk_root
= smack_known_floor
.smk_known
;
182 sbsp
->smk_default
= smack_known_floor
.smk_known
;
183 sbsp
->smk_floor
= smack_known_floor
.smk_known
;
184 sbsp
->smk_hat
= smack_known_hat
.smk_known
;
185 sbsp
->smk_initialized
= 0;
186 spin_lock_init(&sbsp
->smk_sblock
);
188 sb
->s_security
= sbsp
;
194 * smack_sb_free_security - free a superblock blob
195 * @sb: the superblock getting the blob
198 static void smack_sb_free_security(struct super_block
*sb
)
200 kfree(sb
->s_security
);
201 sb
->s_security
= NULL
;
205 * smack_sb_copy_data - copy mount options data for processing
206 * @type: file system type
207 * @orig: where to start
210 * Returns 0 on success or -ENOMEM on error.
212 * Copy the Smack specific mount options out of the mount
215 static int smack_sb_copy_data(char *orig
, char *smackopts
)
217 char *cp
, *commap
, *otheropts
, *dp
;
219 otheropts
= (char *)get_zeroed_page(GFP_KERNEL
);
220 if (otheropts
== NULL
)
223 for (cp
= orig
, commap
= orig
; commap
!= NULL
; cp
= commap
+ 1) {
224 if (strstr(cp
, SMK_FSDEFAULT
) == cp
)
226 else if (strstr(cp
, SMK_FSFLOOR
) == cp
)
228 else if (strstr(cp
, SMK_FSHAT
) == cp
)
230 else if (strstr(cp
, SMK_FSROOT
) == cp
)
235 commap
= strchr(cp
, ',');
244 strcpy(orig
, otheropts
);
245 free_page((unsigned long)otheropts
);
251 * smack_sb_kern_mount - Smack specific mount processing
252 * @sb: the file system superblock
253 * @data: the smack mount options
255 * Returns 0 on success, an error code on failure
257 static int smack_sb_kern_mount(struct super_block
*sb
, void *data
)
259 struct dentry
*root
= sb
->s_root
;
260 struct inode
*inode
= root
->d_inode
;
261 struct superblock_smack
*sp
= sb
->s_security
;
262 struct inode_smack
*isp
;
267 spin_lock(&sp
->smk_sblock
);
268 if (sp
->smk_initialized
!= 0) {
269 spin_unlock(&sp
->smk_sblock
);
272 sp
->smk_initialized
= 1;
273 spin_unlock(&sp
->smk_sblock
);
275 for (op
= data
; op
!= NULL
; op
= commap
) {
276 commap
= strchr(op
, ',');
280 if (strncmp(op
, SMK_FSHAT
, strlen(SMK_FSHAT
)) == 0) {
281 op
+= strlen(SMK_FSHAT
);
282 nsp
= smk_import(op
, 0);
285 } else if (strncmp(op
, SMK_FSFLOOR
, strlen(SMK_FSFLOOR
)) == 0) {
286 op
+= strlen(SMK_FSFLOOR
);
287 nsp
= smk_import(op
, 0);
290 } else if (strncmp(op
, SMK_FSDEFAULT
,
291 strlen(SMK_FSDEFAULT
)) == 0) {
292 op
+= strlen(SMK_FSDEFAULT
);
293 nsp
= smk_import(op
, 0);
295 sp
->smk_default
= nsp
;
296 } else if (strncmp(op
, SMK_FSROOT
, strlen(SMK_FSROOT
)) == 0) {
297 op
+= strlen(SMK_FSROOT
);
298 nsp
= smk_import(op
, 0);
305 * Initialize the root inode.
307 isp
= inode
->i_security
;
309 inode
->i_security
= new_inode_smack(sp
->smk_root
);
311 isp
->smk_inode
= sp
->smk_root
;
317 * smack_sb_statfs - Smack check on statfs
318 * @dentry: identifies the file system in question
320 * Returns 0 if current can read the floor of the filesystem,
321 * and error code otherwise
323 static int smack_sb_statfs(struct dentry
*dentry
)
325 struct superblock_smack
*sbp
= dentry
->d_sb
->s_security
;
327 return smk_curacc(sbp
->smk_floor
, MAY_READ
);
331 * smack_sb_mount - Smack check for mounting
338 * Returns 0 if current can write the floor of the filesystem
339 * being mounted on, an error code otherwise.
341 static int smack_sb_mount(char *dev_name
, struct path
*path
,
342 char *type
, unsigned long flags
, void *data
)
344 struct superblock_smack
*sbp
= path
->mnt
->mnt_sb
->s_security
;
346 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
350 * smack_sb_umount - Smack check for unmounting
351 * @mnt: file system to unmount
354 * Returns 0 if current can write the floor of the filesystem
355 * being unmounted, an error code otherwise.
357 static int smack_sb_umount(struct vfsmount
*mnt
, int flags
)
359 struct superblock_smack
*sbp
;
361 sbp
= mnt
->mnt_sb
->s_security
;
363 return smk_curacc(sbp
->smk_floor
, MAY_WRITE
);
371 * smack_inode_alloc_security - allocate an inode blob
372 * @inode - the inode in need of a blob
374 * Returns 0 if it gets a blob, -ENOMEM otherwise
376 static int smack_inode_alloc_security(struct inode
*inode
)
378 inode
->i_security
= new_inode_smack(current_security());
379 if (inode
->i_security
== NULL
)
385 * smack_inode_free_security - free an inode blob
386 * @inode - the inode with a blob
388 * Clears the blob pointer in inode
390 static void smack_inode_free_security(struct inode
*inode
)
392 kfree(inode
->i_security
);
393 inode
->i_security
= NULL
;
397 * smack_inode_init_security - copy out the smack from an inode
400 * @name: where to put the attribute name
401 * @value: where to put the attribute value
402 * @len: where to put the length of the attribute
404 * Returns 0 if it all works out, -ENOMEM if there's no memory
406 static int smack_inode_init_security(struct inode
*inode
, struct inode
*dir
,
407 char **name
, void **value
, size_t *len
)
409 char *isp
= smk_of_inode(inode
);
412 *name
= kstrdup(XATTR_SMACK_SUFFIX
, GFP_KERNEL
);
418 *value
= kstrdup(isp
, GFP_KERNEL
);
424 *len
= strlen(isp
) + 1;
430 * smack_inode_link - Smack check on link
431 * @old_dentry: the existing object
433 * @new_dentry: the new object
435 * Returns 0 if access is permitted, an error code otherwise
437 static int smack_inode_link(struct dentry
*old_dentry
, struct inode
*dir
,
438 struct dentry
*new_dentry
)
443 isp
= smk_of_inode(old_dentry
->d_inode
);
444 rc
= smk_curacc(isp
, MAY_WRITE
);
446 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
447 isp
= smk_of_inode(new_dentry
->d_inode
);
448 rc
= smk_curacc(isp
, MAY_WRITE
);
455 * smack_inode_unlink - Smack check on inode deletion
456 * @dir: containing directory object
457 * @dentry: file to unlink
459 * Returns 0 if current can write the containing directory
460 * and the object, error code otherwise
462 static int smack_inode_unlink(struct inode
*dir
, struct dentry
*dentry
)
464 struct inode
*ip
= dentry
->d_inode
;
468 * You need write access to the thing you're unlinking
470 rc
= smk_curacc(smk_of_inode(ip
), MAY_WRITE
);
473 * You also need write access to the containing directory
475 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
481 * smack_inode_rmdir - Smack check on directory deletion
482 * @dir: containing directory object
483 * @dentry: directory to unlink
485 * Returns 0 if current can write the containing directory
486 * and the directory, error code otherwise
488 static int smack_inode_rmdir(struct inode
*dir
, struct dentry
*dentry
)
493 * You need write access to the thing you're removing
495 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
498 * You also need write access to the containing directory
500 rc
= smk_curacc(smk_of_inode(dir
), MAY_WRITE
);
506 * smack_inode_rename - Smack check on rename
507 * @old_inode: the old directory
508 * @old_dentry: unused
509 * @new_inode: the new directory
510 * @new_dentry: unused
512 * Read and write access is required on both the old and
515 * Returns 0 if access is permitted, an error code otherwise
517 static int smack_inode_rename(struct inode
*old_inode
,
518 struct dentry
*old_dentry
,
519 struct inode
*new_inode
,
520 struct dentry
*new_dentry
)
525 isp
= smk_of_inode(old_dentry
->d_inode
);
526 rc
= smk_curacc(isp
, MAY_READWRITE
);
528 if (rc
== 0 && new_dentry
->d_inode
!= NULL
) {
529 isp
= smk_of_inode(new_dentry
->d_inode
);
530 rc
= smk_curacc(isp
, MAY_READWRITE
);
537 * smack_inode_permission - Smack version of permission()
538 * @inode: the inode in question
539 * @mask: the access requested
542 * This is the important Smack hook.
544 * Returns 0 if access is permitted, -EACCES otherwise
546 static int smack_inode_permission(struct inode
*inode
, int mask
)
549 * No permission to check. Existence test. Yup, it's there.
554 return smk_curacc(smk_of_inode(inode
), mask
);
558 * smack_inode_setattr - Smack check for setting attributes
559 * @dentry: the object
560 * @iattr: for the force flag
562 * Returns 0 if access is permitted, an error code otherwise
564 static int smack_inode_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
567 * Need to allow for clearing the setuid bit.
569 if (iattr
->ia_valid
& ATTR_FORCE
)
572 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
576 * smack_inode_getattr - Smack check for getting attributes
578 * @dentry: the object
580 * Returns 0 if access is permitted, an error code otherwise
582 static int smack_inode_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
)
584 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
588 * smack_inode_setxattr - Smack check for setting xattrs
589 * @dentry: the object
590 * @name: name of the attribute
595 * This protects the Smack attribute explicitly.
597 * Returns 0 if access is permitted, an error code otherwise
599 static int smack_inode_setxattr(struct dentry
*dentry
, const char *name
,
600 const void *value
, size_t size
, int flags
)
604 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
605 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
606 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
607 if (!capable(CAP_MAC_ADMIN
))
610 rc
= cap_inode_setxattr(dentry
, name
, value
, size
, flags
);
613 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
619 * smack_inode_post_setxattr - Apply the Smack update approved above
621 * @name: attribute name
622 * @value: attribute value
623 * @size: attribute size
626 * Set the pointer in the inode blob to the entry found
627 * in the master label list.
629 static void smack_inode_post_setxattr(struct dentry
*dentry
, const char *name
,
630 const void *value
, size_t size
, int flags
)
632 struct inode_smack
*isp
;
638 if (strcmp(name
, XATTR_NAME_SMACK
))
641 if (size
>= SMK_LABELLEN
)
644 isp
= dentry
->d_inode
->i_security
;
647 * No locking is done here. This is a pointer
650 nsp
= smk_import(value
, size
);
652 isp
->smk_inode
= nsp
;
654 isp
->smk_inode
= smack_known_invalid
.smk_known
;
660 * smack_inode_getxattr - Smack check on getxattr
661 * @dentry: the object
664 * Returns 0 if access is permitted, an error code otherwise
666 static int smack_inode_getxattr(struct dentry
*dentry
, const char *name
)
668 return smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_READ
);
672 * smack_inode_removexattr - Smack check on removexattr
673 * @dentry: the object
674 * @name: name of the attribute
676 * Removing the Smack attribute requires CAP_MAC_ADMIN
678 * Returns 0 if access is permitted, an error code otherwise
680 static int smack_inode_removexattr(struct dentry
*dentry
, const char *name
)
684 if (strcmp(name
, XATTR_NAME_SMACK
) == 0 ||
685 strcmp(name
, XATTR_NAME_SMACKIPIN
) == 0 ||
686 strcmp(name
, XATTR_NAME_SMACKIPOUT
) == 0) {
687 if (!capable(CAP_MAC_ADMIN
))
690 rc
= cap_inode_removexattr(dentry
, name
);
693 rc
= smk_curacc(smk_of_inode(dentry
->d_inode
), MAY_WRITE
);
699 * smack_inode_getsecurity - get smack xattrs
701 * @name: attribute name
702 * @buffer: where to put the result
703 * @size: size of the buffer
706 * Returns the size of the attribute or an error code
708 static int smack_inode_getsecurity(const struct inode
*inode
,
709 const char *name
, void **buffer
,
712 struct socket_smack
*ssp
;
714 struct super_block
*sbp
;
715 struct inode
*ip
= (struct inode
*)inode
;
720 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
721 isp
= smk_of_inode(inode
);
722 ilen
= strlen(isp
) + 1;
728 * The rest of the Smack xattrs are only on sockets.
731 if (sbp
->s_magic
!= SOCKFS_MAGIC
)
735 if (sock
== NULL
|| sock
->sk
== NULL
)
738 ssp
= sock
->sk
->sk_security
;
740 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
742 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0)
747 ilen
= strlen(isp
) + 1;
758 * smack_inode_listsecurity - list the Smack attributes
760 * @buffer: where they go
761 * @buffer_size: size of buffer
763 * Returns 0 on success, -EINVAL otherwise
765 static int smack_inode_listsecurity(struct inode
*inode
, char *buffer
,
768 int len
= strlen(XATTR_NAME_SMACK
);
770 if (buffer
!= NULL
&& len
<= buffer_size
) {
771 memcpy(buffer
, XATTR_NAME_SMACK
, len
);
778 * smack_inode_getsecid - Extract inode's security id
779 * @inode: inode to extract the info from
780 * @secid: where result will be saved
782 static void smack_inode_getsecid(const struct inode
*inode
, u32
*secid
)
784 struct inode_smack
*isp
= inode
->i_security
;
786 *secid
= smack_to_secid(isp
->smk_inode
);
794 * smack_file_permission - Smack check on file operations
800 * Should access checks be done on each read or write?
801 * UNICOS and SELinux say yes.
802 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
804 * I'll say no for now. Smack does not do the frequent
805 * label changing that SELinux does.
807 static int smack_file_permission(struct file
*file
, int mask
)
813 * smack_file_alloc_security - assign a file security blob
816 * The security blob for a file is a pointer to the master
817 * label list, so no allocation is done.
821 static int smack_file_alloc_security(struct file
*file
)
823 file
->f_security
= current_security();
828 * smack_file_free_security - clear a file security blob
831 * The security blob for a file is a pointer to the master
832 * label list, so no memory is freed.
834 static void smack_file_free_security(struct file
*file
)
836 file
->f_security
= NULL
;
840 * smack_file_ioctl - Smack check on ioctls
845 * Relies heavily on the correct use of the ioctl command conventions.
847 * Returns 0 if allowed, error code otherwise
849 static int smack_file_ioctl(struct file
*file
, unsigned int cmd
,
854 if (_IOC_DIR(cmd
) & _IOC_WRITE
)
855 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
857 if (rc
== 0 && (_IOC_DIR(cmd
) & _IOC_READ
))
858 rc
= smk_curacc(file
->f_security
, MAY_READ
);
864 * smack_file_lock - Smack check on file locking
868 * Returns 0 if current has write access, error code otherwise
870 static int smack_file_lock(struct file
*file
, unsigned int cmd
)
872 return smk_curacc(file
->f_security
, MAY_WRITE
);
876 * smack_file_fcntl - Smack check on fcntl
878 * @cmd: what action to check
881 * Returns 0 if current has access, error code otherwise
883 static int smack_file_fcntl(struct file
*file
, unsigned int cmd
,
895 rc
= smk_curacc(file
->f_security
, MAY_READ
);
903 rc
= smk_curacc(file
->f_security
, MAY_WRITE
);
906 rc
= smk_curacc(file
->f_security
, MAY_READWRITE
);
913 * smack_file_set_fowner - set the file security blob value
914 * @file: object in question
917 * Further research may be required on this one.
919 static int smack_file_set_fowner(struct file
*file
)
921 file
->f_security
= current_security();
926 * smack_file_send_sigiotask - Smack on sigio
927 * @tsk: The target task
928 * @fown: the object the signal come from
931 * Allow a privileged task to get signals even if it shouldn't
933 * Returns 0 if a subject with the object's smack could
934 * write to the task, an error code otherwise.
936 static int smack_file_send_sigiotask(struct task_struct
*tsk
,
937 struct fown_struct
*fown
, int signum
)
943 * struct fown_struct is never outside the context of a struct file
945 file
= container_of(fown
, struct file
, f_owner
);
946 rc
= smk_access(file
->f_security
, tsk
->cred
->security
, MAY_WRITE
);
947 if (rc
!= 0 && has_capability(tsk
, CAP_MAC_OVERRIDE
))
953 * smack_file_receive - Smack file receive check
956 * Returns 0 if current has access, error code otherwise
958 static int smack_file_receive(struct file
*file
)
963 * This code relies on bitmasks.
965 if (file
->f_mode
& FMODE_READ
)
967 if (file
->f_mode
& FMODE_WRITE
)
970 return smk_curacc(file
->f_security
, may
);
978 * smack_cred_free - "free" task-level security credentials
979 * @cred: the credentials in question
981 * Smack isn't using copies of blobs. Everyone
982 * points to an immutable list. The blobs never go away.
983 * There is no leak here.
985 static void smack_cred_free(struct cred
*cred
)
987 cred
->security
= NULL
;
991 * smack_cred_prepare - prepare new set of credentials for modification
992 * @new: the new credentials
993 * @old: the original credentials
994 * @gfp: the atomicity of any memory allocations
996 * Prepare a new set of credentials for modification.
998 static int smack_cred_prepare(struct cred
*new, const struct cred
*old
,
1001 new->security
= old
->security
;
1006 * commit new credentials
1007 * @new: the new credentials
1008 * @old: the original credentials
1010 static void smack_cred_commit(struct cred
*new, const struct cred
*old
)
1015 * smack_kernel_act_as - Set the subjective context in a set of credentials
1016 * @new points to the set of credentials to be modified.
1017 * @secid specifies the security ID to be set
1019 * Set the security data for a kernel service.
1021 static int smack_kernel_act_as(struct cred
*new, u32 secid
)
1023 char *smack
= smack_from_secid(secid
);
1028 new->security
= smack
;
1033 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1034 * @new points to the set of credentials to be modified
1035 * @inode points to the inode to use as a reference
1037 * Set the file creation context in a set of credentials to the same
1038 * as the objective context of the specified inode
1040 static int smack_kernel_create_files_as(struct cred
*new,
1041 struct inode
*inode
)
1043 struct inode_smack
*isp
= inode
->i_security
;
1045 new->security
= isp
->smk_inode
;
1050 * smack_task_setpgid - Smack check on setting pgid
1051 * @p: the task object
1054 * Return 0 if write access is permitted
1056 static int smack_task_setpgid(struct task_struct
*p
, pid_t pgid
)
1058 return smk_curacc(task_security(p
), MAY_WRITE
);
1062 * smack_task_getpgid - Smack access check for getpgid
1063 * @p: the object task
1065 * Returns 0 if current can read the object task, error code otherwise
1067 static int smack_task_getpgid(struct task_struct
*p
)
1069 return smk_curacc(task_security(p
), MAY_READ
);
1073 * smack_task_getsid - Smack access check for getsid
1074 * @p: the object task
1076 * Returns 0 if current can read the object task, error code otherwise
1078 static int smack_task_getsid(struct task_struct
*p
)
1080 return smk_curacc(task_security(p
), MAY_READ
);
1084 * smack_task_getsecid - get the secid of the task
1085 * @p: the object task
1086 * @secid: where to put the result
1088 * Sets the secid to contain a u32 version of the smack label.
1090 static void smack_task_getsecid(struct task_struct
*p
, u32
*secid
)
1092 *secid
= smack_to_secid(task_security(p
));
1096 * smack_task_setnice - Smack check on setting nice
1097 * @p: the task object
1100 * Return 0 if write access is permitted
1102 static int smack_task_setnice(struct task_struct
*p
, int nice
)
1106 rc
= cap_task_setnice(p
, nice
);
1108 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1113 * smack_task_setioprio - Smack check on setting ioprio
1114 * @p: the task object
1117 * Return 0 if write access is permitted
1119 static int smack_task_setioprio(struct task_struct
*p
, int ioprio
)
1123 rc
= cap_task_setioprio(p
, ioprio
);
1125 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1130 * smack_task_getioprio - Smack check on reading ioprio
1131 * @p: the task object
1133 * Return 0 if read access is permitted
1135 static int smack_task_getioprio(struct task_struct
*p
)
1137 return smk_curacc(task_security(p
), MAY_READ
);
1141 * smack_task_setscheduler - Smack check on setting scheduler
1142 * @p: the task object
1146 * Return 0 if read access is permitted
1148 static int smack_task_setscheduler(struct task_struct
*p
, int policy
,
1149 struct sched_param
*lp
)
1153 rc
= cap_task_setscheduler(p
, policy
, lp
);
1155 rc
= smk_curacc(task_security(p
), MAY_WRITE
);
1160 * smack_task_getscheduler - Smack check on reading scheduler
1161 * @p: the task object
1163 * Return 0 if read access is permitted
1165 static int smack_task_getscheduler(struct task_struct
*p
)
1167 return smk_curacc(task_security(p
), MAY_READ
);
1171 * smack_task_movememory - Smack check on moving memory
1172 * @p: the task object
1174 * Return 0 if write access is permitted
1176 static int smack_task_movememory(struct task_struct
*p
)
1178 return smk_curacc(task_security(p
), MAY_WRITE
);
1182 * smack_task_kill - Smack check on signal delivery
1183 * @p: the task object
1186 * @secid: identifies the smack to use in lieu of current's
1188 * Return 0 if write access is permitted
1190 * The secid behavior is an artifact of an SELinux hack
1191 * in the USB code. Someday it may go away.
1193 static int smack_task_kill(struct task_struct
*p
, struct siginfo
*info
,
1197 * Sending a signal requires that the sender
1198 * can write the receiver.
1201 return smk_curacc(task_security(p
), MAY_WRITE
);
1203 * If the secid isn't 0 we're dealing with some USB IO
1204 * specific behavior. This is not clean. For one thing
1205 * we can't take privilege into account.
1207 return smk_access(smack_from_secid(secid
), task_security(p
), MAY_WRITE
);
1211 * smack_task_wait - Smack access check for waiting
1212 * @p: task to wait for
1214 * Returns 0 if current can wait for p, error code otherwise
1216 static int smack_task_wait(struct task_struct
*p
)
1220 rc
= smk_access(current_security(), task_security(p
), MAY_WRITE
);
1225 * Allow the operation to succeed if either task
1226 * has privilege to perform operations that might
1227 * account for the smack labels having gotten to
1228 * be different in the first place.
1230 * This breaks the strict subject/object access
1231 * control ideal, taking the object's privilege
1232 * state into account in the decision as well as
1235 if (capable(CAP_MAC_OVERRIDE
) || has_capability(p
, CAP_MAC_OVERRIDE
))
1242 * smack_task_to_inode - copy task smack into the inode blob
1243 * @p: task to copy from
1244 * inode: inode to copy to
1246 * Sets the smack pointer in the inode security blob
1248 static void smack_task_to_inode(struct task_struct
*p
, struct inode
*inode
)
1250 struct inode_smack
*isp
= inode
->i_security
;
1251 isp
->smk_inode
= task_security(p
);
1259 * smack_sk_alloc_security - Allocate a socket blob
1262 * @priority: memory allocation priority
1264 * Assign Smack pointers to current
1266 * Returns 0 on success, -ENOMEM is there's no memory
1268 static int smack_sk_alloc_security(struct sock
*sk
, int family
, gfp_t gfp_flags
)
1270 char *csp
= current_security();
1271 struct socket_smack
*ssp
;
1273 ssp
= kzalloc(sizeof(struct socket_smack
), gfp_flags
);
1279 ssp
->smk_packet
[0] = '\0';
1281 sk
->sk_security
= ssp
;
1287 * smack_sk_free_security - Free a socket blob
1290 * Clears the blob pointer
1292 static void smack_sk_free_security(struct sock
*sk
)
1294 kfree(sk
->sk_security
);
1298 * smack_set_catset - convert a capset to netlabel mls categories
1299 * @catset: the Smack categories
1300 * @sap: where to put the netlabel categories
1302 * Allocates and fills attr.mls.cat
1304 static void smack_set_catset(char *catset
, struct netlbl_lsm_secattr
*sap
)
1315 sap
->flags
|= NETLBL_SECATTR_MLS_CAT
;
1316 sap
->attr
.mls
.cat
= netlbl_secattr_catmap_alloc(GFP_ATOMIC
);
1317 sap
->attr
.mls
.cat
->startbit
= 0;
1319 for (cat
= 1, cp
= catset
, byte
= 0; byte
< SMK_LABELLEN
; cp
++, byte
++)
1320 for (m
= 0x80; m
!= 0; m
>>= 1, cat
++) {
1323 rc
= netlbl_secattr_catmap_setbit(sap
->attr
.mls
.cat
,
1329 * smack_to_secattr - fill a secattr from a smack value
1330 * @smack: the smack value
1331 * @nlsp: where the result goes
1333 * Casey says that CIPSO is good enough for now.
1334 * It can be used to effect.
1335 * It can also be abused to effect when necessary.
1336 * Appologies to the TSIG group in general and GW in particular.
1338 static void smack_to_secattr(char *smack
, struct netlbl_lsm_secattr
*nlsp
)
1340 struct smack_cipso cipso
;
1343 switch (smack_net_nltype
) {
1344 case NETLBL_NLTYPE_CIPSOV4
:
1345 nlsp
->domain
= smack
;
1346 nlsp
->flags
= NETLBL_SECATTR_DOMAIN
| NETLBL_SECATTR_MLS_LVL
;
1348 rc
= smack_to_cipso(smack
, &cipso
);
1350 nlsp
->attr
.mls
.lvl
= cipso
.smk_level
;
1351 smack_set_catset(cipso
.smk_catset
, nlsp
);
1353 nlsp
->attr
.mls
.lvl
= smack_cipso_direct
;
1354 smack_set_catset(smack
, nlsp
);
1363 * smack_netlabel - Set the secattr on a socket
1366 * Convert the outbound smack value (smk_out) to a
1367 * secattr and attach it to the socket.
1369 * Returns 0 on success or an error code
1371 static int smack_netlabel(struct sock
*sk
)
1373 struct socket_smack
*ssp
;
1374 struct netlbl_lsm_secattr secattr
;
1377 ssp
= sk
->sk_security
;
1378 netlbl_secattr_init(&secattr
);
1379 smack_to_secattr(ssp
->smk_out
, &secattr
);
1380 rc
= netlbl_sock_setattr(sk
, &secattr
);
1381 netlbl_secattr_destroy(&secattr
);
1387 * smack_inode_setsecurity - set smack xattrs
1388 * @inode: the object
1389 * @name: attribute name
1390 * @value: attribute value
1391 * @size: size of the attribute
1394 * Sets the named attribute in the appropriate blob
1396 * Returns 0 on success, or an error code
1398 static int smack_inode_setsecurity(struct inode
*inode
, const char *name
,
1399 const void *value
, size_t size
, int flags
)
1402 struct inode_smack
*nsp
= inode
->i_security
;
1403 struct socket_smack
*ssp
;
1404 struct socket
*sock
;
1407 if (value
== NULL
|| size
> SMK_LABELLEN
)
1410 sp
= smk_import(value
, size
);
1414 if (strcmp(name
, XATTR_SMACK_SUFFIX
) == 0) {
1415 nsp
->smk_inode
= sp
;
1419 * The rest of the Smack xattrs are only on sockets.
1421 if (inode
->i_sb
->s_magic
!= SOCKFS_MAGIC
)
1424 sock
= SOCKET_I(inode
);
1425 if (sock
== NULL
|| sock
->sk
== NULL
)
1428 ssp
= sock
->sk
->sk_security
;
1430 if (strcmp(name
, XATTR_SMACK_IPIN
) == 0)
1432 else if (strcmp(name
, XATTR_SMACK_IPOUT
) == 0) {
1434 rc
= smack_netlabel(sock
->sk
);
1436 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
1445 * smack_socket_post_create - finish socket setup
1447 * @family: protocol family
1452 * Sets the netlabel information on the socket
1454 * Returns 0 on success, and error code otherwise
1456 static int smack_socket_post_create(struct socket
*sock
, int family
,
1457 int type
, int protocol
, int kern
)
1459 if (family
!= PF_INET
|| sock
->sk
== NULL
)
1462 * Set the outbound netlbl.
1464 return smack_netlabel(sock
->sk
);
1468 * smack_flags_to_may - convert S_ to MAY_ values
1469 * @flags: the S_ value
1471 * Returns the equivalent MAY_ value
1473 static int smack_flags_to_may(int flags
)
1477 if (flags
& S_IRUGO
)
1479 if (flags
& S_IWUGO
)
1481 if (flags
& S_IXUGO
)
1488 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1493 static int smack_msg_msg_alloc_security(struct msg_msg
*msg
)
1495 msg
->security
= current_security();
1500 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1503 * Clears the blob pointer
1505 static void smack_msg_msg_free_security(struct msg_msg
*msg
)
1507 msg
->security
= NULL
;
1511 * smack_of_shm - the smack pointer for the shm
1514 * Returns a pointer to the smack value
1516 static char *smack_of_shm(struct shmid_kernel
*shp
)
1518 return (char *)shp
->shm_perm
.security
;
1522 * smack_shm_alloc_security - Set the security blob for shm
1527 static int smack_shm_alloc_security(struct shmid_kernel
*shp
)
1529 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1531 isp
->security
= current_security();
1536 * smack_shm_free_security - Clear the security blob for shm
1539 * Clears the blob pointer
1541 static void smack_shm_free_security(struct shmid_kernel
*shp
)
1543 struct kern_ipc_perm
*isp
= &shp
->shm_perm
;
1545 isp
->security
= NULL
;
1549 * smack_shm_associate - Smack access check for shm
1551 * @shmflg: access requested
1553 * Returns 0 if current has the requested access, error code otherwise
1555 static int smack_shm_associate(struct shmid_kernel
*shp
, int shmflg
)
1557 char *ssp
= smack_of_shm(shp
);
1560 may
= smack_flags_to_may(shmflg
);
1561 return smk_curacc(ssp
, may
);
1565 * smack_shm_shmctl - Smack access check for shm
1567 * @cmd: what it wants to do
1569 * Returns 0 if current has the requested access, error code otherwise
1571 static int smack_shm_shmctl(struct shmid_kernel
*shp
, int cmd
)
1585 may
= MAY_READWRITE
;
1590 * System level information.
1597 ssp
= smack_of_shm(shp
);
1598 return smk_curacc(ssp
, may
);
1602 * smack_shm_shmat - Smack access for shmat
1605 * @shmflg: access requested
1607 * Returns 0 if current has the requested access, error code otherwise
1609 static int smack_shm_shmat(struct shmid_kernel
*shp
, char __user
*shmaddr
,
1612 char *ssp
= smack_of_shm(shp
);
1615 may
= smack_flags_to_may(shmflg
);
1616 return smk_curacc(ssp
, may
);
1620 * smack_of_sem - the smack pointer for the sem
1623 * Returns a pointer to the smack value
1625 static char *smack_of_sem(struct sem_array
*sma
)
1627 return (char *)sma
->sem_perm
.security
;
1631 * smack_sem_alloc_security - Set the security blob for sem
1636 static int smack_sem_alloc_security(struct sem_array
*sma
)
1638 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1640 isp
->security
= current_security();
1645 * smack_sem_free_security - Clear the security blob for sem
1648 * Clears the blob pointer
1650 static void smack_sem_free_security(struct sem_array
*sma
)
1652 struct kern_ipc_perm
*isp
= &sma
->sem_perm
;
1654 isp
->security
= NULL
;
1658 * smack_sem_associate - Smack access check for sem
1660 * @semflg: access requested
1662 * Returns 0 if current has the requested access, error code otherwise
1664 static int smack_sem_associate(struct sem_array
*sma
, int semflg
)
1666 char *ssp
= smack_of_sem(sma
);
1669 may
= smack_flags_to_may(semflg
);
1670 return smk_curacc(ssp
, may
);
1674 * smack_sem_shmctl - Smack access check for sem
1676 * @cmd: what it wants to do
1678 * Returns 0 if current has the requested access, error code otherwise
1680 static int smack_sem_semctl(struct sem_array
*sma
, int cmd
)
1699 may
= MAY_READWRITE
;
1704 * System level information
1711 ssp
= smack_of_sem(sma
);
1712 return smk_curacc(ssp
, may
);
1716 * smack_sem_semop - Smack checks of semaphore operations
1722 * Treated as read and write in all cases.
1724 * Returns 0 if access is allowed, error code otherwise
1726 static int smack_sem_semop(struct sem_array
*sma
, struct sembuf
*sops
,
1727 unsigned nsops
, int alter
)
1729 char *ssp
= smack_of_sem(sma
);
1731 return smk_curacc(ssp
, MAY_READWRITE
);
1735 * smack_msg_alloc_security - Set the security blob for msg
1740 static int smack_msg_queue_alloc_security(struct msg_queue
*msq
)
1742 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1744 kisp
->security
= current_security();
1749 * smack_msg_free_security - Clear the security blob for msg
1752 * Clears the blob pointer
1754 static void smack_msg_queue_free_security(struct msg_queue
*msq
)
1756 struct kern_ipc_perm
*kisp
= &msq
->q_perm
;
1758 kisp
->security
= NULL
;
1762 * smack_of_msq - the smack pointer for the msq
1765 * Returns a pointer to the smack value
1767 static char *smack_of_msq(struct msg_queue
*msq
)
1769 return (char *)msq
->q_perm
.security
;
1773 * smack_msg_queue_associate - Smack access check for msg_queue
1775 * @msqflg: access requested
1777 * Returns 0 if current has the requested access, error code otherwise
1779 static int smack_msg_queue_associate(struct msg_queue
*msq
, int msqflg
)
1781 char *msp
= smack_of_msq(msq
);
1784 may
= smack_flags_to_may(msqflg
);
1785 return smk_curacc(msp
, may
);
1789 * smack_msg_queue_msgctl - Smack access check for msg_queue
1791 * @cmd: what it wants to do
1793 * Returns 0 if current has the requested access, error code otherwise
1795 static int smack_msg_queue_msgctl(struct msg_queue
*msq
, int cmd
)
1807 may
= MAY_READWRITE
;
1812 * System level information
1819 msp
= smack_of_msq(msq
);
1820 return smk_curacc(msp
, may
);
1824 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1827 * @msqflg: access requested
1829 * Returns 0 if current has the requested access, error code otherwise
1831 static int smack_msg_queue_msgsnd(struct msg_queue
*msq
, struct msg_msg
*msg
,
1834 char *msp
= smack_of_msq(msq
);
1837 rc
= smack_flags_to_may(msqflg
);
1838 return smk_curacc(msp
, rc
);
1842 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1849 * Returns 0 if current has read and write access, error code otherwise
1851 static int smack_msg_queue_msgrcv(struct msg_queue
*msq
, struct msg_msg
*msg
,
1852 struct task_struct
*target
, long type
, int mode
)
1854 char *msp
= smack_of_msq(msq
);
1856 return smk_curacc(msp
, MAY_READWRITE
);
1860 * smack_ipc_permission - Smack access for ipc_permission()
1861 * @ipp: the object permissions
1862 * @flag: access requested
1864 * Returns 0 if current has read and write access, error code otherwise
1866 static int smack_ipc_permission(struct kern_ipc_perm
*ipp
, short flag
)
1868 char *isp
= ipp
->security
;
1871 may
= smack_flags_to_may(flag
);
1872 return smk_curacc(isp
, may
);
1876 * smack_ipc_getsecid - Extract smack security id
1877 * @ipcp: the object permissions
1878 * @secid: where result will be saved
1880 static void smack_ipc_getsecid(struct kern_ipc_perm
*ipp
, u32
*secid
)
1882 char *smack
= ipp
->security
;
1884 *secid
= smack_to_secid(smack
);
1888 * smack_d_instantiate - Make sure the blob is correct on an inode
1889 * @opt_dentry: unused
1890 * @inode: the object
1892 * Set the inode's security blob if it hasn't been done already.
1894 static void smack_d_instantiate(struct dentry
*opt_dentry
, struct inode
*inode
)
1896 struct super_block
*sbp
;
1897 struct superblock_smack
*sbsp
;
1898 struct inode_smack
*isp
;
1899 char *csp
= current_security();
1907 isp
= inode
->i_security
;
1909 mutex_lock(&isp
->smk_lock
);
1911 * If the inode is already instantiated
1912 * take the quick way out
1914 if (isp
->smk_flags
& SMK_INODE_INSTANT
)
1918 sbsp
= sbp
->s_security
;
1920 * We're going to use the superblock default label
1921 * if there's no label on the file.
1923 final
= sbsp
->smk_default
;
1926 * If this is the root inode the superblock
1927 * may be in the process of initialization.
1928 * If that is the case use the root value out
1929 * of the superblock.
1931 if (opt_dentry
->d_parent
== opt_dentry
) {
1932 isp
->smk_inode
= sbsp
->smk_root
;
1933 isp
->smk_flags
|= SMK_INODE_INSTANT
;
1938 * This is pretty hackish.
1939 * Casey says that we shouldn't have to do
1940 * file system specific code, but it does help
1941 * with keeping it simple.
1943 switch (sbp
->s_magic
) {
1946 * Casey says that it's a little embarassing
1947 * that the smack file system doesn't do
1948 * extended attributes.
1950 final
= smack_known_star
.smk_known
;
1954 * Casey says pipes are easy (?)
1956 final
= smack_known_star
.smk_known
;
1958 case DEVPTS_SUPER_MAGIC
:
1960 * devpts seems content with the label of the task.
1961 * Programs that change smack have to treat the
1968 * Casey says sockets get the smack of the task.
1972 case PROC_SUPER_MAGIC
:
1974 * Casey says procfs appears not to care.
1975 * The superblock default suffices.
1980 * Device labels should come from the filesystem,
1981 * but watch out, because they're volitile,
1982 * getting recreated on every reboot.
1984 final
= smack_known_star
.smk_known
;
1988 * If a smack value has been set we want to use it,
1989 * but since tmpfs isn't giving us the opportunity
1990 * to set mount options simulate setting the
1991 * superblock default.
1995 * This isn't an understood special case.
1996 * Get the value from the xattr.
1998 * No xattr support means, alas, no SMACK label.
1999 * Use the aforeapplied default.
2000 * It would be curious if the label of the task
2001 * does not match that assigned.
2003 if (inode
->i_op
->getxattr
== NULL
)
2006 * Get the dentry for xattr.
2008 if (opt_dentry
== NULL
) {
2009 dp
= d_find_alias(inode
);
2013 dp
= dget(opt_dentry
);
2018 fetched
= smk_fetch(inode
, dp
);
2019 if (fetched
!= NULL
)
2027 isp
->smk_inode
= csp
;
2029 isp
->smk_inode
= final
;
2031 isp
->smk_flags
|= SMK_INODE_INSTANT
;
2034 mutex_unlock(&isp
->smk_lock
);
2039 * smack_getprocattr - Smack process attribute access
2040 * @p: the object task
2041 * @name: the name of the attribute in /proc/.../attr
2042 * @value: where to put the result
2044 * Places a copy of the task Smack into value
2046 * Returns the length of the smack label or an error code
2048 static int smack_getprocattr(struct task_struct
*p
, char *name
, char **value
)
2053 if (strcmp(name
, "current") != 0)
2056 cp
= kstrdup(task_security(p
), GFP_KERNEL
);
2066 * smack_setprocattr - Smack process attribute setting
2067 * @p: the object task
2068 * @name: the name of the attribute in /proc/.../attr
2069 * @value: the value to set
2070 * @size: the size of the value
2072 * Sets the Smack value of the task. Only setting self
2073 * is permitted and only with privilege
2075 * Returns the length of the smack label or an error code
2077 static int smack_setprocattr(struct task_struct
*p
, char *name
,
2078 void *value
, size_t size
)
2084 * Changing another process' Smack value is too dangerous
2085 * and supports no sane use case.
2090 if (!capable(CAP_MAC_ADMIN
))
2093 if (value
== NULL
|| size
== 0 || size
>= SMK_LABELLEN
)
2096 if (strcmp(name
, "current") != 0)
2099 newsmack
= smk_import(value
, size
);
2100 if (newsmack
== NULL
)
2103 new = prepare_creds();
2106 new->security
= newsmack
;
2112 * smack_unix_stream_connect - Smack access on UDS
2114 * @other: the other socket
2117 * Return 0 if a subject with the smack of sock could access
2118 * an object with the smack of other, otherwise an error code
2120 static int smack_unix_stream_connect(struct socket
*sock
,
2121 struct socket
*other
, struct sock
*newsk
)
2123 struct inode
*sp
= SOCK_INODE(sock
);
2124 struct inode
*op
= SOCK_INODE(other
);
2126 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_READWRITE
);
2130 * smack_unix_may_send - Smack access on UDS
2132 * @other: the other socket
2134 * Return 0 if a subject with the smack of sock could access
2135 * an object with the smack of other, otherwise an error code
2137 static int smack_unix_may_send(struct socket
*sock
, struct socket
*other
)
2139 struct inode
*sp
= SOCK_INODE(sock
);
2140 struct inode
*op
= SOCK_INODE(other
);
2142 return smk_access(smk_of_inode(sp
), smk_of_inode(op
), MAY_WRITE
);
2146 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2148 * @sap: netlabel secattr
2149 * @sip: where to put the result
2151 * Copies a smack label into sip
2153 static void smack_from_secattr(struct netlbl_lsm_secattr
*sap
, char *sip
)
2155 char smack
[SMK_LABELLEN
];
2158 if ((sap
->flags
& NETLBL_SECATTR_MLS_LVL
) == 0) {
2160 * If there are flags but no level netlabel isn't
2161 * behaving the way we expect it to.
2163 * Without guidance regarding the smack value
2164 * for the packet fall back on the network
2167 strncpy(sip
, smack_net_ambient
, SMK_MAXLEN
);
2171 * Get the categories, if any
2173 memset(smack
, '\0', SMK_LABELLEN
);
2174 if ((sap
->flags
& NETLBL_SECATTR_MLS_CAT
) != 0)
2176 pcat
= netlbl_secattr_catmap_walk(sap
->attr
.mls
.cat
,
2180 smack_catset_bit(pcat
, smack
);
2183 * If it is CIPSO using smack direct mapping
2184 * we are already done. WeeHee.
2186 if (sap
->attr
.mls
.lvl
== smack_cipso_direct
) {
2187 memcpy(sip
, smack
, SMK_MAXLEN
);
2191 * Look it up in the supplied table if it is not a direct mapping.
2193 smack_from_cipso(sap
->attr
.mls
.lvl
, smack
, sip
);
2198 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2202 * Returns 0 if the packet should be delivered, an error code otherwise
2204 static int smack_socket_sock_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
2206 struct netlbl_lsm_secattr secattr
;
2207 struct socket_smack
*ssp
= sk
->sk_security
;
2208 char smack
[SMK_LABELLEN
];
2211 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2215 * Translate what netlabel gave us.
2217 memset(smack
, '\0', SMK_LABELLEN
);
2218 netlbl_secattr_init(&secattr
);
2219 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &secattr
);
2221 smack_from_secattr(&secattr
, smack
);
2223 strncpy(smack
, smack_net_ambient
, SMK_MAXLEN
);
2224 netlbl_secattr_destroy(&secattr
);
2226 * Receiving a packet requires that the other end
2227 * be able to write here. Read access is not required.
2228 * This is the simplist possible security model
2231 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2233 netlbl_skbuff_err(skb
, rc
, 0);
2238 * smack_socket_getpeersec_stream - pull in packet label
2240 * @optval: user's destination
2241 * @optlen: size thereof
2244 * returns zero on success, an error code otherwise
2246 static int smack_socket_getpeersec_stream(struct socket
*sock
,
2247 char __user
*optval
,
2248 int __user
*optlen
, unsigned len
)
2250 struct socket_smack
*ssp
;
2254 ssp
= sock
->sk
->sk_security
;
2255 slen
= strlen(ssp
->smk_packet
) + 1;
2259 else if (copy_to_user(optval
, ssp
->smk_packet
, slen
) != 0)
2262 if (put_user(slen
, optlen
) != 0)
2270 * smack_socket_getpeersec_dgram - pull in packet label
2273 * @secid: pointer to where to put the secid of the packet
2275 * Sets the netlabel socket state on sk from parent
2277 static int smack_socket_getpeersec_dgram(struct socket
*sock
,
2278 struct sk_buff
*skb
, u32
*secid
)
2281 struct netlbl_lsm_secattr secattr
;
2283 char smack
[SMK_LABELLEN
];
2284 int family
= PF_INET
;
2289 * Only works for families with packets.
2293 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2295 family
= sk
->sk_family
;
2298 * Translate what netlabel gave us.
2300 memset(smack
, '\0', SMK_LABELLEN
);
2301 netlbl_secattr_init(&secattr
);
2302 rc
= netlbl_skbuff_getattr(skb
, family
, &secattr
);
2304 smack_from_secattr(&secattr
, smack
);
2305 netlbl_secattr_destroy(&secattr
);
2308 * Give up if we couldn't get anything
2313 s
= smack_to_secid(smack
);
2322 * smack_sock_graft - graft access state between two sockets
2324 * @parent: donor socket
2326 * Sets the netlabel socket state on sk from parent
2328 static void smack_sock_graft(struct sock
*sk
, struct socket
*parent
)
2330 struct socket_smack
*ssp
;
2336 if (sk
->sk_family
!= PF_INET
&& sk
->sk_family
!= PF_INET6
)
2339 ssp
= sk
->sk_security
;
2340 ssp
->smk_in
= ssp
->smk_out
= current_security();
2341 ssp
->smk_packet
[0] = '\0';
2343 rc
= smack_netlabel(sk
);
2345 printk(KERN_WARNING
"Smack: \"%s\" netlbl error %d.\n",
2350 * smack_inet_conn_request - Smack access check on connect
2351 * @sk: socket involved
2355 * Returns 0 if a task with the packet label could write to
2356 * the socket, otherwise an error code
2358 static int smack_inet_conn_request(struct sock
*sk
, struct sk_buff
*skb
,
2359 struct request_sock
*req
)
2361 struct netlbl_lsm_secattr skb_secattr
;
2362 struct socket_smack
*ssp
= sk
->sk_security
;
2363 char smack
[SMK_LABELLEN
];
2369 memset(smack
, '\0', SMK_LABELLEN
);
2370 netlbl_secattr_init(&skb_secattr
);
2371 rc
= netlbl_skbuff_getattr(skb
, sk
->sk_family
, &skb_secattr
);
2373 smack_from_secattr(&skb_secattr
, smack
);
2375 strncpy(smack
, smack_known_huh
.smk_known
, SMK_MAXLEN
);
2376 netlbl_secattr_destroy(&skb_secattr
);
2378 * Receiving a packet requires that the other end
2379 * be able to write here. Read access is not required.
2381 * If the request is successful save the peer's label
2382 * so that SO_PEERCRED can report it.
2384 rc
= smk_access(smack
, ssp
->smk_in
, MAY_WRITE
);
2386 strncpy(ssp
->smk_packet
, smack
, SMK_MAXLEN
);
2392 * Key management security hooks
2394 * Casey has not tested key support very heavily.
2395 * The permission check is most likely too restrictive.
2396 * If you care about keys please have a look.
2401 * smack_key_alloc - Set the key security blob
2403 * @cred: the credentials to use
2406 * No allocation required
2410 static int smack_key_alloc(struct key
*key
, const struct cred
*cred
,
2411 unsigned long flags
)
2413 key
->security
= cred
->security
;
2418 * smack_key_free - Clear the key security blob
2421 * Clear the blob pointer
2423 static void smack_key_free(struct key
*key
)
2425 key
->security
= NULL
;
2429 * smack_key_permission - Smack access on a key
2430 * @key_ref: gets to the object
2431 * @cred: the credentials to use
2434 * Return 0 if the task has read and write to the object,
2435 * an error code otherwise
2437 static int smack_key_permission(key_ref_t key_ref
,
2438 const struct cred
*cred
, key_perm_t perm
)
2442 keyp
= key_ref_to_ptr(key_ref
);
2446 * If the key hasn't been initialized give it access so that
2449 if (keyp
->security
== NULL
)
2452 * This should not occur
2454 if (cred
->security
== NULL
)
2457 return smk_access(cred
->security
, keyp
->security
, MAY_READWRITE
);
2459 #endif /* CONFIG_KEYS */
2464 * Audit requires a unique representation of each Smack specific
2465 * rule. This unique representation is used to distinguish the
2466 * object to be audited from remaining kernel objects and also
2467 * works as a glue between the audit hooks.
2469 * Since repository entries are added but never deleted, we'll use
2470 * the smack_known label address related to the given audit rule as
2471 * the needed unique representation. This also better fits the smack
2472 * model where nearly everything is a label.
2477 * smack_audit_rule_init - Initialize a smack audit rule
2478 * @field: audit rule fields given from user-space (audit.h)
2479 * @op: required testing operator (=, !=, >, <, ...)
2480 * @rulestr: smack label to be audited
2481 * @vrule: pointer to save our own audit rule representation
2483 * Prepare to audit cases where (@field @op @rulestr) is true.
2484 * The label to be audited is created if necessay.
2486 static int smack_audit_rule_init(u32 field
, u32 op
, char *rulestr
, void **vrule
)
2488 char **rule
= (char **)vrule
;
2491 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2494 if (op
!= AUDIT_EQUAL
&& op
!= AUDIT_NOT_EQUAL
)
2497 *rule
= smk_import(rulestr
, 0);
2503 * smack_audit_rule_known - Distinguish Smack audit rules
2504 * @krule: rule of interest, in Audit kernel representation format
2506 * This is used to filter Smack rules from remaining Audit ones.
2507 * If it's proved that this rule belongs to us, the
2508 * audit_rule_match hook will be called to do the final judgement.
2510 static int smack_audit_rule_known(struct audit_krule
*krule
)
2512 struct audit_field
*f
;
2515 for (i
= 0; i
< krule
->field_count
; i
++) {
2516 f
= &krule
->fields
[i
];
2518 if (f
->type
== AUDIT_SUBJ_USER
|| f
->type
== AUDIT_OBJ_USER
)
2526 * smack_audit_rule_match - Audit given object ?
2527 * @secid: security id for identifying the object to test
2528 * @field: audit rule flags given from user-space
2529 * @op: required testing operator
2530 * @vrule: smack internal rule presentation
2531 * @actx: audit context associated with the check
2533 * The core Audit hook. It's used to take the decision of
2534 * whether to audit or not to audit a given object.
2536 static int smack_audit_rule_match(u32 secid
, u32 field
, u32 op
, void *vrule
,
2537 struct audit_context
*actx
)
2543 audit_log(actx
, GFP_KERNEL
, AUDIT_SELINUX_ERR
,
2544 "Smack: missing rule\n");
2548 if (field
!= AUDIT_SUBJ_USER
&& field
!= AUDIT_OBJ_USER
)
2551 smack
= smack_from_secid(secid
);
2554 * No need to do string comparisons. If a match occurs,
2555 * both pointers will point to the same smack_known
2558 if (op
== AUDIT_EQUAL
)
2559 return (rule
== smack
);
2560 if (op
== AUDIT_NOT_EQUAL
)
2561 return (rule
!= smack
);
2567 * smack_audit_rule_free - free smack rule representation
2568 * @vrule: rule to be freed.
2570 * No memory was allocated.
2572 static void smack_audit_rule_free(void *vrule
)
2577 #endif /* CONFIG_AUDIT */
2580 * smack_secid_to_secctx - return the smack label for a secid
2581 * @secid: incoming integer
2582 * @secdata: destination
2583 * @seclen: how long it is
2585 * Exists for networking code.
2587 static int smack_secid_to_secctx(u32 secid
, char **secdata
, u32
*seclen
)
2589 char *sp
= smack_from_secid(secid
);
2592 *seclen
= strlen(sp
);
2597 * smack_secctx_to_secid - return the secid for a smack label
2598 * @secdata: smack label
2599 * @seclen: how long result is
2600 * @secid: outgoing integer
2602 * Exists for audit and networking code.
2604 static int smack_secctx_to_secid(const char *secdata
, u32 seclen
, u32
*secid
)
2606 *secid
= smack_to_secid(secdata
);
2611 * smack_release_secctx - don't do anything.
2616 * Exists to make sure nothing gets done, and properly
2618 static void smack_release_secctx(char *secdata
, u32 seclen
)
2622 struct security_operations smack_ops
= {
2625 .ptrace_may_access
= smack_ptrace_may_access
,
2626 .ptrace_traceme
= smack_ptrace_traceme
,
2627 .capget
= cap_capget
,
2628 .capset
= cap_capset
,
2629 .capable
= cap_capable
,
2630 .syslog
= smack_syslog
,
2631 .settime
= cap_settime
,
2632 .vm_enough_memory
= cap_vm_enough_memory
,
2634 .bprm_set_creds
= cap_bprm_set_creds
,
2635 .bprm_secureexec
= cap_bprm_secureexec
,
2637 .sb_alloc_security
= smack_sb_alloc_security
,
2638 .sb_free_security
= smack_sb_free_security
,
2639 .sb_copy_data
= smack_sb_copy_data
,
2640 .sb_kern_mount
= smack_sb_kern_mount
,
2641 .sb_statfs
= smack_sb_statfs
,
2642 .sb_mount
= smack_sb_mount
,
2643 .sb_umount
= smack_sb_umount
,
2645 .inode_alloc_security
= smack_inode_alloc_security
,
2646 .inode_free_security
= smack_inode_free_security
,
2647 .inode_init_security
= smack_inode_init_security
,
2648 .inode_link
= smack_inode_link
,
2649 .inode_unlink
= smack_inode_unlink
,
2650 .inode_rmdir
= smack_inode_rmdir
,
2651 .inode_rename
= smack_inode_rename
,
2652 .inode_permission
= smack_inode_permission
,
2653 .inode_setattr
= smack_inode_setattr
,
2654 .inode_getattr
= smack_inode_getattr
,
2655 .inode_setxattr
= smack_inode_setxattr
,
2656 .inode_post_setxattr
= smack_inode_post_setxattr
,
2657 .inode_getxattr
= smack_inode_getxattr
,
2658 .inode_removexattr
= smack_inode_removexattr
,
2659 .inode_need_killpriv
= cap_inode_need_killpriv
,
2660 .inode_killpriv
= cap_inode_killpriv
,
2661 .inode_getsecurity
= smack_inode_getsecurity
,
2662 .inode_setsecurity
= smack_inode_setsecurity
,
2663 .inode_listsecurity
= smack_inode_listsecurity
,
2664 .inode_getsecid
= smack_inode_getsecid
,
2666 .file_permission
= smack_file_permission
,
2667 .file_alloc_security
= smack_file_alloc_security
,
2668 .file_free_security
= smack_file_free_security
,
2669 .file_ioctl
= smack_file_ioctl
,
2670 .file_lock
= smack_file_lock
,
2671 .file_fcntl
= smack_file_fcntl
,
2672 .file_set_fowner
= smack_file_set_fowner
,
2673 .file_send_sigiotask
= smack_file_send_sigiotask
,
2674 .file_receive
= smack_file_receive
,
2676 .cred_free
= smack_cred_free
,
2677 .cred_prepare
= smack_cred_prepare
,
2678 .cred_commit
= smack_cred_commit
,
2679 .kernel_act_as
= smack_kernel_act_as
,
2680 .kernel_create_files_as
= smack_kernel_create_files_as
,
2681 .task_fix_setuid
= cap_task_fix_setuid
,
2682 .task_setpgid
= smack_task_setpgid
,
2683 .task_getpgid
= smack_task_getpgid
,
2684 .task_getsid
= smack_task_getsid
,
2685 .task_getsecid
= smack_task_getsecid
,
2686 .task_setnice
= smack_task_setnice
,
2687 .task_setioprio
= smack_task_setioprio
,
2688 .task_getioprio
= smack_task_getioprio
,
2689 .task_setscheduler
= smack_task_setscheduler
,
2690 .task_getscheduler
= smack_task_getscheduler
,
2691 .task_movememory
= smack_task_movememory
,
2692 .task_kill
= smack_task_kill
,
2693 .task_wait
= smack_task_wait
,
2694 .task_to_inode
= smack_task_to_inode
,
2695 .task_prctl
= cap_task_prctl
,
2697 .ipc_permission
= smack_ipc_permission
,
2698 .ipc_getsecid
= smack_ipc_getsecid
,
2700 .msg_msg_alloc_security
= smack_msg_msg_alloc_security
,
2701 .msg_msg_free_security
= smack_msg_msg_free_security
,
2703 .msg_queue_alloc_security
= smack_msg_queue_alloc_security
,
2704 .msg_queue_free_security
= smack_msg_queue_free_security
,
2705 .msg_queue_associate
= smack_msg_queue_associate
,
2706 .msg_queue_msgctl
= smack_msg_queue_msgctl
,
2707 .msg_queue_msgsnd
= smack_msg_queue_msgsnd
,
2708 .msg_queue_msgrcv
= smack_msg_queue_msgrcv
,
2710 .shm_alloc_security
= smack_shm_alloc_security
,
2711 .shm_free_security
= smack_shm_free_security
,
2712 .shm_associate
= smack_shm_associate
,
2713 .shm_shmctl
= smack_shm_shmctl
,
2714 .shm_shmat
= smack_shm_shmat
,
2716 .sem_alloc_security
= smack_sem_alloc_security
,
2717 .sem_free_security
= smack_sem_free_security
,
2718 .sem_associate
= smack_sem_associate
,
2719 .sem_semctl
= smack_sem_semctl
,
2720 .sem_semop
= smack_sem_semop
,
2722 .netlink_send
= cap_netlink_send
,
2723 .netlink_recv
= cap_netlink_recv
,
2725 .d_instantiate
= smack_d_instantiate
,
2727 .getprocattr
= smack_getprocattr
,
2728 .setprocattr
= smack_setprocattr
,
2730 .unix_stream_connect
= smack_unix_stream_connect
,
2731 .unix_may_send
= smack_unix_may_send
,
2733 .socket_post_create
= smack_socket_post_create
,
2734 .socket_sock_rcv_skb
= smack_socket_sock_rcv_skb
,
2735 .socket_getpeersec_stream
= smack_socket_getpeersec_stream
,
2736 .socket_getpeersec_dgram
= smack_socket_getpeersec_dgram
,
2737 .sk_alloc_security
= smack_sk_alloc_security
,
2738 .sk_free_security
= smack_sk_free_security
,
2739 .sock_graft
= smack_sock_graft
,
2740 .inet_conn_request
= smack_inet_conn_request
,
2742 /* key management security hooks */
2744 .key_alloc
= smack_key_alloc
,
2745 .key_free
= smack_key_free
,
2746 .key_permission
= smack_key_permission
,
2747 #endif /* CONFIG_KEYS */
2751 .audit_rule_init
= smack_audit_rule_init
,
2752 .audit_rule_known
= smack_audit_rule_known
,
2753 .audit_rule_match
= smack_audit_rule_match
,
2754 .audit_rule_free
= smack_audit_rule_free
,
2755 #endif /* CONFIG_AUDIT */
2757 .secid_to_secctx
= smack_secid_to_secctx
,
2758 .secctx_to_secid
= smack_secctx_to_secid
,
2759 .release_secctx
= smack_release_secctx
,
2763 * smack_init - initialize the smack system
2767 static __init
int smack_init(void)
2771 if (!security_module_enable(&smack_ops
))
2774 printk(KERN_INFO
"Smack: Initializing.\n");
2777 * Set the security state for the initial task.
2779 cred
= (struct cred
*) current
->cred
;
2780 cred
->security
= &smack_known_floor
.smk_known
;
2785 spin_lock_init(&smack_known_unset
.smk_cipsolock
);
2786 spin_lock_init(&smack_known_huh
.smk_cipsolock
);
2787 spin_lock_init(&smack_known_hat
.smk_cipsolock
);
2788 spin_lock_init(&smack_known_star
.smk_cipsolock
);
2789 spin_lock_init(&smack_known_floor
.smk_cipsolock
);
2790 spin_lock_init(&smack_known_invalid
.smk_cipsolock
);
2795 if (register_security(&smack_ops
))
2796 panic("smack: Unable to register with kernel.\n");
2802 * Smack requires early initialization in order to label
2803 * all processes and objects when they are created.
2805 security_initcall(smack_init
);