2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/slab.h>
31 #include <linux/mutex.h>
32 #include <linux/pipe_fs_i.h>
33 #include <net/cipso_ipv4.h>
34 #include <linux/audit.h>
35 #include <linux/magic.h>
36 #include <linux/dcache.h>
37 #include <linux/personality.h>
38 #include <linux/msg.h>
39 #include <linux/shm.h>
40 #include <linux/binfmts.h>
43 #define task_security(task) (task_cred_xxx((task), security))
45 #define TRANS_TRUE "TRUE"
46 #define TRANS_TRUE_SIZE 4
49 * smk_fetch - Fetch the smack label from a file.
50 * @ip: a pointer to the inode
51 * @dp: a pointer to the dentry
53 * Returns a pointer to the master list entry for the Smack label
54 * or NULL if there was no label to fetch.
56 static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
62 if (ip->i_op->getxattr == NULL)
65 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
69 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
71 result = smk_import(buffer, rc);
79 * new_inode_smack - allocate an inode security blob
80 * @smack: a pointer to the Smack label to use in the blob
82 * Returns the new blob or NULL if there's no memory available
84 struct inode_smack *new_inode_smack(char *smack)
86 struct inode_smack *isp;
88 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
92 isp->smk_inode = smack;
94 mutex_init(&isp->smk_lock);
100 * new_task_smack - allocate a task security blob
101 * @smack: a pointer to the Smack label to use in the blob
103 * Returns the new blob or NULL if there's no memory available
105 static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
107 struct task_smack *tsp;
109 tsp = kzalloc(sizeof(struct task_smack), gfp);
113 tsp->smk_task = task;
114 tsp->smk_forked = forked;
115 INIT_LIST_HEAD(&tsp->smk_rules);
116 mutex_init(&tsp->smk_rules_lock);
122 * smk_copy_rules - copy a rule set
123 * @nhead - new rules header pointer
124 * @ohead - old rules header pointer
126 * Returns 0 on success, -ENOMEM on error
128 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
131 struct smack_rule *nrp;
132 struct smack_rule *orp;
135 INIT_LIST_HEAD(nhead);
137 list_for_each_entry_rcu(orp, ohead, list) {
138 nrp = kzalloc(sizeof(struct smack_rule), gfp);
144 list_add_rcu(&nrp->list, nhead);
151 * We he, that is fun!
155 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
156 * @ctp: child task pointer
157 * @mode: ptrace attachment mode
159 * Returns 0 if access is OK, an error code otherwise
161 * Do the capability checks, and require read and write.
163 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
166 struct smk_audit_info ad;
169 rc = cap_ptrace_access_check(ctp, mode);
173 tsp = smk_of_task(task_security(ctp));
174 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
175 smk_ad_setfield_u_tsk(&ad, ctp);
177 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
182 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
183 * @ptp: parent task pointer
185 * Returns 0 if access is OK, an error code otherwise
187 * Do the capability checks, and require read and write.
189 static int smack_ptrace_traceme(struct task_struct *ptp)
192 struct smk_audit_info ad;
195 rc = cap_ptrace_traceme(ptp);
199 tsp = smk_of_task(task_security(ptp));
200 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
201 smk_ad_setfield_u_tsk(&ad, ptp);
203 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
208 * smack_syslog - Smack approval on syslog
209 * @type: message type
211 * Require that the task has the floor label
213 * Returns 0 on success, error code otherwise.
215 static int smack_syslog(int typefrom_file)
218 char *sp = smk_of_current();
220 if (capable(CAP_MAC_OVERRIDE))
223 if (sp != smack_known_floor.smk_known)
235 * smack_sb_alloc_security - allocate a superblock blob
236 * @sb: the superblock getting the blob
238 * Returns 0 on success or -ENOMEM on error.
240 static int smack_sb_alloc_security(struct super_block *sb)
242 struct superblock_smack *sbsp;
244 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
249 sbsp->smk_root = smack_known_floor.smk_known;
250 sbsp->smk_default = smack_known_floor.smk_known;
251 sbsp->smk_floor = smack_known_floor.smk_known;
252 sbsp->smk_hat = smack_known_hat.smk_known;
253 sbsp->smk_initialized = 0;
254 spin_lock_init(&sbsp->smk_sblock);
256 sb->s_security = sbsp;
262 * smack_sb_free_security - free a superblock blob
263 * @sb: the superblock getting the blob
266 static void smack_sb_free_security(struct super_block *sb)
268 kfree(sb->s_security);
269 sb->s_security = NULL;
273 * smack_sb_copy_data - copy mount options data for processing
274 * @orig: where to start
275 * @smackopts: mount options string
277 * Returns 0 on success or -ENOMEM on error.
279 * Copy the Smack specific mount options out of the mount
282 static int smack_sb_copy_data(char *orig, char *smackopts)
284 char *cp, *commap, *otheropts, *dp;
286 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
287 if (otheropts == NULL)
290 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
291 if (strstr(cp, SMK_FSDEFAULT) == cp)
293 else if (strstr(cp, SMK_FSFLOOR) == cp)
295 else if (strstr(cp, SMK_FSHAT) == cp)
297 else if (strstr(cp, SMK_FSROOT) == cp)
302 commap = strchr(cp, ',');
311 strcpy(orig, otheropts);
312 free_page((unsigned long)otheropts);
318 * smack_sb_kern_mount - Smack specific mount processing
319 * @sb: the file system superblock
320 * @flags: the mount flags
321 * @data: the smack mount options
323 * Returns 0 on success, an error code on failure
325 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
327 struct dentry *root = sb->s_root;
328 struct inode *inode = root->d_inode;
329 struct superblock_smack *sp = sb->s_security;
330 struct inode_smack *isp;
335 spin_lock(&sp->smk_sblock);
336 if (sp->smk_initialized != 0) {
337 spin_unlock(&sp->smk_sblock);
340 sp->smk_initialized = 1;
341 spin_unlock(&sp->smk_sblock);
343 for (op = data; op != NULL; op = commap) {
344 commap = strchr(op, ',');
348 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
349 op += strlen(SMK_FSHAT);
350 nsp = smk_import(op, 0);
353 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
354 op += strlen(SMK_FSFLOOR);
355 nsp = smk_import(op, 0);
358 } else if (strncmp(op, SMK_FSDEFAULT,
359 strlen(SMK_FSDEFAULT)) == 0) {
360 op += strlen(SMK_FSDEFAULT);
361 nsp = smk_import(op, 0);
363 sp->smk_default = nsp;
364 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
365 op += strlen(SMK_FSROOT);
366 nsp = smk_import(op, 0);
373 * Initialize the root inode.
375 isp = inode->i_security;
377 inode->i_security = new_inode_smack(sp->smk_root);
379 isp->smk_inode = sp->smk_root;
385 * smack_sb_statfs - Smack check on statfs
386 * @dentry: identifies the file system in question
388 * Returns 0 if current can read the floor of the filesystem,
389 * and error code otherwise
391 static int smack_sb_statfs(struct dentry *dentry)
393 struct superblock_smack *sbp = dentry->d_sb->s_security;
395 struct smk_audit_info ad;
397 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
398 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
400 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
405 * smack_sb_mount - Smack check for mounting
412 * Returns 0 if current can write the floor of the filesystem
413 * being mounted on, an error code otherwise.
415 static int smack_sb_mount(char *dev_name, struct path *path,
416 char *type, unsigned long flags, void *data)
418 struct superblock_smack *sbp = path->dentry->d_sb->s_security;
419 struct smk_audit_info ad;
421 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
422 smk_ad_setfield_u_fs_path(&ad, *path);
424 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
428 * smack_sb_umount - Smack check for unmounting
429 * @mnt: file system to unmount
432 * Returns 0 if current can write the floor of the filesystem
433 * being unmounted, an error code otherwise.
435 static int smack_sb_umount(struct vfsmount *mnt, int flags)
437 struct superblock_smack *sbp;
438 struct smk_audit_info ad;
441 path.dentry = mnt->mnt_root;
444 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
445 smk_ad_setfield_u_fs_path(&ad, path);
447 sbp = path.dentry->d_sb->s_security;
448 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
456 * smack_bprm_set_creds - set creds for exec
457 * @bprm: the exec information
459 * Returns 0 if it gets a blob, -ENOMEM otherwise
461 static int smack_bprm_set_creds(struct linux_binprm *bprm)
463 struct inode *inode = bprm->file->f_path.dentry->d_inode;
464 struct task_smack *bsp = bprm->cred->security;
465 struct inode_smack *isp;
468 rc = cap_bprm_set_creds(bprm);
472 if (bprm->cred_prepared)
475 isp = inode->i_security;
476 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
482 bsp->smk_task = isp->smk_task;
483 bprm->per_clear |= PER_CLEAR_ON_SETID;
489 * smack_bprm_committing_creds - Prepare to install the new credentials
492 * @bprm: binprm for exec
494 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
496 struct task_smack *bsp = bprm->cred->security;
498 if (bsp->smk_task != bsp->smk_forked)
499 current->pdeath_signal = 0;
503 * smack_bprm_secureexec - Return the decision to use secureexec.
504 * @bprm: binprm for exec
506 * Returns 0 on success.
508 static int smack_bprm_secureexec(struct linux_binprm *bprm)
510 struct task_smack *tsp = current_security();
511 int ret = cap_bprm_secureexec(bprm);
513 if (!ret && (tsp->smk_task != tsp->smk_forked))
524 * smack_inode_alloc_security - allocate an inode blob
525 * @inode: the inode in need of a blob
527 * Returns 0 if it gets a blob, -ENOMEM otherwise
529 static int smack_inode_alloc_security(struct inode *inode)
531 inode->i_security = new_inode_smack(smk_of_current());
532 if (inode->i_security == NULL)
538 * smack_inode_free_security - free an inode blob
539 * @inode: the inode with a blob
541 * Clears the blob pointer in inode
543 static void smack_inode_free_security(struct inode *inode)
545 kfree(inode->i_security);
546 inode->i_security = NULL;
550 * smack_inode_init_security - copy out the smack from an inode
554 * @name: where to put the attribute name
555 * @value: where to put the attribute value
556 * @len: where to put the length of the attribute
558 * Returns 0 if it all works out, -ENOMEM if there's no memory
560 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
561 const struct qstr *qstr, char **name,
562 void **value, size_t *len)
564 struct smack_known *skp;
565 struct inode_smack *issp = inode->i_security;
566 char *csp = smk_of_current();
567 char *isp = smk_of_inode(inode);
568 char *dsp = smk_of_inode(dir);
572 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
578 skp = smk_find_entry(csp);
580 may = smk_access_entry(csp, dsp, &skp->smk_rules);
584 * If the access rule allows transmutation and
585 * the directory requests transmutation then
586 * by all means transmute.
587 * Mark the inode as changed.
589 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
590 smk_inode_transmutable(dir)) {
592 issp->smk_flags |= SMK_INODE_CHANGED;
595 *value = kstrdup(isp, GFP_NOFS);
601 *len = strlen(isp) + 1;
607 * smack_inode_link - Smack check on link
608 * @old_dentry: the existing object
610 * @new_dentry: the new object
612 * Returns 0 if access is permitted, an error code otherwise
614 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
615 struct dentry *new_dentry)
618 struct smk_audit_info ad;
621 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
622 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
624 isp = smk_of_inode(old_dentry->d_inode);
625 rc = smk_curacc(isp, MAY_WRITE, &ad);
627 if (rc == 0 && new_dentry->d_inode != NULL) {
628 isp = smk_of_inode(new_dentry->d_inode);
629 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
630 rc = smk_curacc(isp, MAY_WRITE, &ad);
637 * smack_inode_unlink - Smack check on inode deletion
638 * @dir: containing directory object
639 * @dentry: file to unlink
641 * Returns 0 if current can write the containing directory
642 * and the object, error code otherwise
644 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
646 struct inode *ip = dentry->d_inode;
647 struct smk_audit_info ad;
650 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
651 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
654 * You need write access to the thing you're unlinking
656 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
659 * You also need write access to the containing directory
661 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
662 smk_ad_setfield_u_fs_inode(&ad, dir);
663 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
669 * smack_inode_rmdir - Smack check on directory deletion
670 * @dir: containing directory object
671 * @dentry: directory to unlink
673 * Returns 0 if current can write the containing directory
674 * and the directory, error code otherwise
676 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
678 struct smk_audit_info ad;
681 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
682 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
685 * You need write access to the thing you're removing
687 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
690 * You also need write access to the containing directory
692 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
693 smk_ad_setfield_u_fs_inode(&ad, dir);
694 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
701 * smack_inode_rename - Smack check on rename
702 * @old_inode: the old directory
703 * @old_dentry: unused
704 * @new_inode: the new directory
705 * @new_dentry: unused
707 * Read and write access is required on both the old and
710 * Returns 0 if access is permitted, an error code otherwise
712 static int smack_inode_rename(struct inode *old_inode,
713 struct dentry *old_dentry,
714 struct inode *new_inode,
715 struct dentry *new_dentry)
719 struct smk_audit_info ad;
721 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
722 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
724 isp = smk_of_inode(old_dentry->d_inode);
725 rc = smk_curacc(isp, MAY_READWRITE, &ad);
727 if (rc == 0 && new_dentry->d_inode != NULL) {
728 isp = smk_of_inode(new_dentry->d_inode);
729 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
730 rc = smk_curacc(isp, MAY_READWRITE, &ad);
736 * smack_inode_permission - Smack version of permission()
737 * @inode: the inode in question
738 * @mask: the access requested
740 * This is the important Smack hook.
742 * Returns 0 if access is permitted, -EACCES otherwise
744 static int smack_inode_permission(struct inode *inode, int mask)
746 struct smk_audit_info ad;
747 int no_block = mask & MAY_NOT_BLOCK;
749 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
751 * No permission to check. Existence test. Yup, it's there.
756 /* May be droppable after audit */
759 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
760 smk_ad_setfield_u_fs_inode(&ad, inode);
761 return smk_curacc(smk_of_inode(inode), mask, &ad);
765 * smack_inode_setattr - Smack check for setting attributes
766 * @dentry: the object
767 * @iattr: for the force flag
769 * Returns 0 if access is permitted, an error code otherwise
771 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
773 struct smk_audit_info ad;
775 * Need to allow for clearing the setuid bit.
777 if (iattr->ia_valid & ATTR_FORCE)
779 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
780 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
782 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
786 * smack_inode_getattr - Smack check for getting attributes
788 * @dentry: the object
790 * Returns 0 if access is permitted, an error code otherwise
792 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
794 struct smk_audit_info ad;
797 path.dentry = dentry;
800 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
801 smk_ad_setfield_u_fs_path(&ad, path);
802 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
806 * smack_inode_setxattr - Smack check for setting xattrs
807 * @dentry: the object
808 * @name: name of the attribute
813 * This protects the Smack attribute explicitly.
815 * Returns 0 if access is permitted, an error code otherwise
817 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
818 const void *value, size_t size, int flags)
820 struct smk_audit_info ad;
823 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
824 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
825 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
826 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
827 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
828 if (!capable(CAP_MAC_ADMIN))
831 * check label validity here so import wont fail on
834 if (size == 0 || size >= SMK_LONGLABEL ||
835 smk_import(value, size) == NULL)
837 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
838 if (!capable(CAP_MAC_ADMIN))
840 if (size != TRANS_TRUE_SIZE ||
841 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
844 rc = cap_inode_setxattr(dentry, name, value, size, flags);
846 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
847 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
850 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
856 * smack_inode_post_setxattr - Apply the Smack update approved above
858 * @name: attribute name
859 * @value: attribute value
860 * @size: attribute size
863 * Set the pointer in the inode blob to the entry found
864 * in the master label list.
866 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
867 const void *value, size_t size, int flags)
870 struct inode_smack *isp = dentry->d_inode->i_security;
872 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
873 nsp = smk_import(value, size);
875 isp->smk_inode = nsp;
877 isp->smk_inode = smack_known_invalid.smk_known;
878 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
879 nsp = smk_import(value, size);
883 isp->smk_task = smack_known_invalid.smk_known;
884 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
885 nsp = smk_import(value, size);
889 isp->smk_mmap = smack_known_invalid.smk_known;
890 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
891 isp->smk_flags |= SMK_INODE_TRANSMUTE;
897 * smack_inode_getxattr - Smack check on getxattr
898 * @dentry: the object
901 * Returns 0 if access is permitted, an error code otherwise
903 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
905 struct smk_audit_info ad;
907 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
908 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
910 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
914 * smack_inode_removexattr - Smack check on removexattr
915 * @dentry: the object
916 * @name: name of the attribute
918 * Removing the Smack attribute requires CAP_MAC_ADMIN
920 * Returns 0 if access is permitted, an error code otherwise
922 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
924 struct inode_smack *isp;
925 struct smk_audit_info ad;
928 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
929 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
930 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
931 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
932 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
933 strcmp(name, XATTR_NAME_SMACKMMAP)) {
934 if (!capable(CAP_MAC_ADMIN))
937 rc = cap_inode_removexattr(dentry, name);
939 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
940 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
942 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
945 isp = dentry->d_inode->i_security;
946 isp->smk_task = NULL;
947 isp->smk_mmap = NULL;
954 * smack_inode_getsecurity - get smack xattrs
956 * @name: attribute name
957 * @buffer: where to put the result
960 * Returns the size of the attribute or an error code
962 static int smack_inode_getsecurity(const struct inode *inode,
963 const char *name, void **buffer,
966 struct socket_smack *ssp;
968 struct super_block *sbp;
969 struct inode *ip = (struct inode *)inode;
974 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
975 isp = smk_of_inode(inode);
976 ilen = strlen(isp) + 1;
982 * The rest of the Smack xattrs are only on sockets.
985 if (sbp->s_magic != SOCKFS_MAGIC)
989 if (sock == NULL || sock->sk == NULL)
992 ssp = sock->sk->sk_security;
994 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
996 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1001 ilen = strlen(isp) + 1;
1012 * smack_inode_listsecurity - list the Smack attributes
1013 * @inode: the object
1014 * @buffer: where they go
1015 * @buffer_size: size of buffer
1017 * Returns 0 on success, -EINVAL otherwise
1019 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1022 int len = strlen(XATTR_NAME_SMACK);
1024 if (buffer != NULL && len <= buffer_size) {
1025 memcpy(buffer, XATTR_NAME_SMACK, len);
1032 * smack_inode_getsecid - Extract inode's security id
1033 * @inode: inode to extract the info from
1034 * @secid: where result will be saved
1036 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1038 struct inode_smack *isp = inode->i_security;
1040 *secid = smack_to_secid(isp->smk_inode);
1048 * smack_file_permission - Smack check on file operations
1054 * Should access checks be done on each read or write?
1055 * UNICOS and SELinux say yes.
1056 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1058 * I'll say no for now. Smack does not do the frequent
1059 * label changing that SELinux does.
1061 static int smack_file_permission(struct file *file, int mask)
1067 * smack_file_alloc_security - assign a file security blob
1070 * The security blob for a file is a pointer to the master
1071 * label list, so no allocation is done.
1075 static int smack_file_alloc_security(struct file *file)
1077 file->f_security = smk_of_current();
1082 * smack_file_free_security - clear a file security blob
1085 * The security blob for a file is a pointer to the master
1086 * label list, so no memory is freed.
1088 static void smack_file_free_security(struct file *file)
1090 file->f_security = NULL;
1094 * smack_file_ioctl - Smack check on ioctls
1099 * Relies heavily on the correct use of the ioctl command conventions.
1101 * Returns 0 if allowed, error code otherwise
1103 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1107 struct smk_audit_info ad;
1109 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1110 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1112 if (_IOC_DIR(cmd) & _IOC_WRITE)
1113 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1115 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1116 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1122 * smack_file_lock - Smack check on file locking
1126 * Returns 0 if current has write access, error code otherwise
1128 static int smack_file_lock(struct file *file, unsigned int cmd)
1130 struct smk_audit_info ad;
1132 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1133 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1134 return smk_curacc(file->f_security, MAY_WRITE, &ad);
1138 * smack_file_fcntl - Smack check on fcntl
1140 * @cmd: what action to check
1143 * Generally these operations are harmless.
1144 * File locking operations present an obvious mechanism
1145 * for passing information, so they require write access.
1147 * Returns 0 if current has access, error code otherwise
1149 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1152 struct smk_audit_info ad;
1162 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1163 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1164 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1175 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1176 * if mapping anonymous memory.
1177 * @file contains the file structure for file to map (may be NULL).
1178 * @reqprot contains the protection requested by the application.
1179 * @prot contains the protection that will be applied by the kernel.
1180 * @flags contains the operational flags.
1181 * Return 0 if permission is granted.
1183 static int smack_file_mmap(struct file *file,
1184 unsigned long reqprot, unsigned long prot,
1185 unsigned long flags, unsigned long addr,
1186 unsigned long addr_only)
1188 struct smack_known *skp;
1189 struct smack_rule *srp;
1190 struct task_smack *tsp;
1194 struct inode_smack *isp;
1201 /* do DAC check on address space usage */
1202 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1203 if (rc || addr_only)
1206 if (file == NULL || file->f_dentry == NULL)
1209 dp = file->f_dentry;
1211 if (dp->d_inode == NULL)
1214 isp = dp->d_inode->i_security;
1215 if (isp->smk_mmap == NULL)
1217 msmack = isp->smk_mmap;
1219 tsp = current_security();
1220 sp = smk_of_current();
1221 skp = smk_find_entry(sp);
1226 * For each Smack rule associated with the subject
1227 * label verify that the SMACK64MMAP also has access
1228 * to that rule's object label.
1230 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1231 osmack = srp->smk_object;
1233 * Matching labels always allows access.
1235 if (msmack == osmack)
1238 * If there is a matching local rule take
1239 * that into account as well.
1241 may = smk_access_entry(srp->smk_subject, osmack,
1244 may = srp->smk_access;
1246 may &= srp->smk_access;
1248 * If may is zero the SMACK64MMAP subject can't
1249 * possibly have less access.
1255 * Fetch the global list entry.
1256 * If there isn't one a SMACK64MMAP subject
1257 * can't have as much access as current.
1259 skp = smk_find_entry(msmack);
1260 mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
1261 if (mmay == -ENOENT) {
1266 * If there is a local entry it modifies the
1267 * potential access, too.
1269 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1270 if (tmay != -ENOENT)
1274 * If there is any access available to current that is
1275 * not available to a SMACK64MMAP subject
1278 if ((may | mmay) != mmay) {
1290 * smack_file_set_fowner - set the file security blob value
1291 * @file: object in question
1294 * Further research may be required on this one.
1296 static int smack_file_set_fowner(struct file *file)
1298 file->f_security = smk_of_current();
1303 * smack_file_send_sigiotask - Smack on sigio
1304 * @tsk: The target task
1305 * @fown: the object the signal come from
1308 * Allow a privileged task to get signals even if it shouldn't
1310 * Returns 0 if a subject with the object's smack could
1311 * write to the task, an error code otherwise.
1313 static int smack_file_send_sigiotask(struct task_struct *tsk,
1314 struct fown_struct *fown, int signum)
1318 char *tsp = smk_of_task(tsk->cred->security);
1319 struct smk_audit_info ad;
1322 * struct fown_struct is never outside the context of a struct file
1324 file = container_of(fown, struct file, f_owner);
1326 /* we don't log here as rc can be overriden */
1327 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1328 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1331 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1332 smk_ad_setfield_u_tsk(&ad, tsk);
1333 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1338 * smack_file_receive - Smack file receive check
1341 * Returns 0 if current has access, error code otherwise
1343 static int smack_file_receive(struct file *file)
1346 struct smk_audit_info ad;
1348 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1349 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1351 * This code relies on bitmasks.
1353 if (file->f_mode & FMODE_READ)
1355 if (file->f_mode & FMODE_WRITE)
1358 return smk_curacc(file->f_security, may, &ad);
1362 * smack_file_open - Smack dentry open processing
1366 * Set the security blob in the file structure.
1370 static int smack_file_open(struct file *file, const struct cred *cred)
1372 struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
1374 file->f_security = isp->smk_inode;
1384 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1385 * @new: the new credentials
1386 * @gfp: the atomicity of any memory allocations
1388 * Prepare a blank set of credentials for modification. This must allocate all
1389 * the memory the LSM module might require such that cred_transfer() can
1390 * complete without error.
1392 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1394 struct task_smack *tsp;
1396 tsp = new_task_smack(NULL, NULL, gfp);
1400 cred->security = tsp;
1407 * smack_cred_free - "free" task-level security credentials
1408 * @cred: the credentials in question
1411 static void smack_cred_free(struct cred *cred)
1413 struct task_smack *tsp = cred->security;
1414 struct smack_rule *rp;
1415 struct list_head *l;
1416 struct list_head *n;
1420 cred->security = NULL;
1422 list_for_each_safe(l, n, &tsp->smk_rules) {
1423 rp = list_entry(l, struct smack_rule, list);
1424 list_del(&rp->list);
1431 * smack_cred_prepare - prepare new set of credentials for modification
1432 * @new: the new credentials
1433 * @old: the original credentials
1434 * @gfp: the atomicity of any memory allocations
1436 * Prepare a new set of credentials for modification.
1438 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1441 struct task_smack *old_tsp = old->security;
1442 struct task_smack *new_tsp;
1445 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1446 if (new_tsp == NULL)
1449 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1453 new->security = new_tsp;
1458 * smack_cred_transfer - Transfer the old credentials to the new credentials
1459 * @new: the new credentials
1460 * @old: the original credentials
1462 * Fill in a set of blank credentials from another set of credentials.
1464 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1466 struct task_smack *old_tsp = old->security;
1467 struct task_smack *new_tsp = new->security;
1469 new_tsp->smk_task = old_tsp->smk_task;
1470 new_tsp->smk_forked = old_tsp->smk_task;
1471 mutex_init(&new_tsp->smk_rules_lock);
1472 INIT_LIST_HEAD(&new_tsp->smk_rules);
1475 /* cbs copy rule list */
1479 * smack_kernel_act_as - Set the subjective context in a set of credentials
1480 * @new: points to the set of credentials to be modified.
1481 * @secid: specifies the security ID to be set
1483 * Set the security data for a kernel service.
1485 static int smack_kernel_act_as(struct cred *new, u32 secid)
1487 struct task_smack *new_tsp = new->security;
1488 char *smack = smack_from_secid(secid);
1493 new_tsp->smk_task = smack;
1498 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1499 * @new: points to the set of credentials to be modified
1500 * @inode: points to the inode to use as a reference
1502 * Set the file creation context in a set of credentials to the same
1503 * as the objective context of the specified inode
1505 static int smack_kernel_create_files_as(struct cred *new,
1506 struct inode *inode)
1508 struct inode_smack *isp = inode->i_security;
1509 struct task_smack *tsp = new->security;
1511 tsp->smk_forked = isp->smk_inode;
1512 tsp->smk_task = isp->smk_inode;
1517 * smk_curacc_on_task - helper to log task related access
1518 * @p: the task object
1519 * @access: the access requested
1520 * @caller: name of the calling function for audit
1522 * Return 0 if access is permitted
1524 static int smk_curacc_on_task(struct task_struct *p, int access,
1527 struct smk_audit_info ad;
1529 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1530 smk_ad_setfield_u_tsk(&ad, p);
1531 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1535 * smack_task_setpgid - Smack check on setting pgid
1536 * @p: the task object
1539 * Return 0 if write access is permitted
1541 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1543 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1547 * smack_task_getpgid - Smack access check for getpgid
1548 * @p: the object task
1550 * Returns 0 if current can read the object task, error code otherwise
1552 static int smack_task_getpgid(struct task_struct *p)
1554 return smk_curacc_on_task(p, MAY_READ, __func__);
1558 * smack_task_getsid - Smack access check for getsid
1559 * @p: the object task
1561 * Returns 0 if current can read the object task, error code otherwise
1563 static int smack_task_getsid(struct task_struct *p)
1565 return smk_curacc_on_task(p, MAY_READ, __func__);
1569 * smack_task_getsecid - get the secid of the task
1570 * @p: the object task
1571 * @secid: where to put the result
1573 * Sets the secid to contain a u32 version of the smack label.
1575 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1577 *secid = smack_to_secid(smk_of_task(task_security(p)));
1581 * smack_task_setnice - Smack check on setting nice
1582 * @p: the task object
1585 * Return 0 if write access is permitted
1587 static int smack_task_setnice(struct task_struct *p, int nice)
1591 rc = cap_task_setnice(p, nice);
1593 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1598 * smack_task_setioprio - Smack check on setting ioprio
1599 * @p: the task object
1602 * Return 0 if write access is permitted
1604 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1608 rc = cap_task_setioprio(p, ioprio);
1610 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1615 * smack_task_getioprio - Smack check on reading ioprio
1616 * @p: the task object
1618 * Return 0 if read access is permitted
1620 static int smack_task_getioprio(struct task_struct *p)
1622 return smk_curacc_on_task(p, MAY_READ, __func__);
1626 * smack_task_setscheduler - Smack check on setting scheduler
1627 * @p: the task object
1631 * Return 0 if read access is permitted
1633 static int smack_task_setscheduler(struct task_struct *p)
1637 rc = cap_task_setscheduler(p);
1639 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1644 * smack_task_getscheduler - Smack check on reading scheduler
1645 * @p: the task object
1647 * Return 0 if read access is permitted
1649 static int smack_task_getscheduler(struct task_struct *p)
1651 return smk_curacc_on_task(p, MAY_READ, __func__);
1655 * smack_task_movememory - Smack check on moving memory
1656 * @p: the task object
1658 * Return 0 if write access is permitted
1660 static int smack_task_movememory(struct task_struct *p)
1662 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1666 * smack_task_kill - Smack check on signal delivery
1667 * @p: the task object
1670 * @secid: identifies the smack to use in lieu of current's
1672 * Return 0 if write access is permitted
1674 * The secid behavior is an artifact of an SELinux hack
1675 * in the USB code. Someday it may go away.
1677 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1680 struct smk_audit_info ad;
1682 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1683 smk_ad_setfield_u_tsk(&ad, p);
1685 * Sending a signal requires that the sender
1686 * can write the receiver.
1689 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1692 * If the secid isn't 0 we're dealing with some USB IO
1693 * specific behavior. This is not clean. For one thing
1694 * we can't take privilege into account.
1696 return smk_access(smack_from_secid(secid),
1697 smk_of_task(task_security(p)), MAY_WRITE, &ad);
1701 * smack_task_wait - Smack access check for waiting
1702 * @p: task to wait for
1704 * Returns 0 if current can wait for p, error code otherwise
1706 static int smack_task_wait(struct task_struct *p)
1708 struct smk_audit_info ad;
1709 char *sp = smk_of_current();
1710 char *tsp = smk_of_forked(task_security(p));
1713 /* we don't log here, we can be overriden */
1714 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
1719 * Allow the operation to succeed if either task
1720 * has privilege to perform operations that might
1721 * account for the smack labels having gotten to
1722 * be different in the first place.
1724 * This breaks the strict subject/object access
1725 * control ideal, taking the object's privilege
1726 * state into account in the decision as well as
1729 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1731 /* we log only if we didn't get overriden */
1733 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1734 smk_ad_setfield_u_tsk(&ad, p);
1735 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
1740 * smack_task_to_inode - copy task smack into the inode blob
1741 * @p: task to copy from
1742 * @inode: inode to copy to
1744 * Sets the smack pointer in the inode security blob
1746 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1748 struct inode_smack *isp = inode->i_security;
1749 isp->smk_inode = smk_of_task(task_security(p));
1757 * smack_sk_alloc_security - Allocate a socket blob
1760 * @gfp_flags: memory allocation flags
1762 * Assign Smack pointers to current
1764 * Returns 0 on success, -ENOMEM is there's no memory
1766 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1768 char *csp = smk_of_current();
1769 struct socket_smack *ssp;
1771 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1777 ssp->smk_packet = NULL;
1779 sk->sk_security = ssp;
1785 * smack_sk_free_security - Free a socket blob
1788 * Clears the blob pointer
1790 static void smack_sk_free_security(struct sock *sk)
1792 kfree(sk->sk_security);
1796 * smack_host_label - check host based restrictions
1797 * @sip: the object end
1799 * looks for host based access restrictions
1801 * This version will only be appropriate for really small sets of single label
1802 * hosts. The caller is responsible for ensuring that the RCU read lock is
1803 * taken before calling this function.
1805 * Returns the label of the far end or NULL if it's not special.
1807 static char *smack_host_label(struct sockaddr_in *sip)
1809 struct smk_netlbladdr *snp;
1810 struct in_addr *siap = &sip->sin_addr;
1812 if (siap->s_addr == 0)
1815 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1817 * we break after finding the first match because
1818 * the list is sorted from longest to shortest mask
1819 * so we have found the most specific match
1821 if ((&snp->smk_host.sin_addr)->s_addr ==
1822 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1823 /* we have found the special CIPSO option */
1824 if (snp->smk_label == smack_cipso_option)
1826 return snp->smk_label;
1833 * smack_netlabel - Set the secattr on a socket
1835 * @labeled: socket label scheme
1837 * Convert the outbound smack value (smk_out) to a
1838 * secattr and attach it to the socket.
1840 * Returns 0 on success or an error code
1842 static int smack_netlabel(struct sock *sk, int labeled)
1844 struct smack_known *skp;
1845 struct socket_smack *ssp = sk->sk_security;
1849 * Usually the netlabel code will handle changing the
1850 * packet labeling based on the label.
1851 * The case of a single label host is different, because
1852 * a single label host should never get a labeled packet
1853 * even though the label is usually associated with a packet
1857 bh_lock_sock_nested(sk);
1859 if (ssp->smk_out == smack_net_ambient ||
1860 labeled == SMACK_UNLABELED_SOCKET)
1861 netlbl_sock_delattr(sk);
1863 skp = smk_find_entry(ssp->smk_out);
1864 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1874 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1876 * @sap: the destination address
1878 * Set the correct secattr for the given socket based on the destination
1879 * address and perform any outbound access checks needed.
1881 * Returns 0 on success or an error code.
1884 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1889 struct socket_smack *ssp = sk->sk_security;
1890 struct smk_audit_info ad;
1893 hostsp = smack_host_label(sap);
1894 if (hostsp != NULL) {
1896 struct lsm_network_audit net;
1898 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1899 ad.a.u.net->family = sap->sin_family;
1900 ad.a.u.net->dport = sap->sin_port;
1901 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
1903 sk_lbl = SMACK_UNLABELED_SOCKET;
1904 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1906 sk_lbl = SMACK_CIPSO_SOCKET;
1913 return smack_netlabel(sk, sk_lbl);
1917 * smack_inode_setsecurity - set smack xattrs
1918 * @inode: the object
1919 * @name: attribute name
1920 * @value: attribute value
1921 * @size: size of the attribute
1924 * Sets the named attribute in the appropriate blob
1926 * Returns 0 on success, or an error code
1928 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1929 const void *value, size_t size, int flags)
1932 struct inode_smack *nsp = inode->i_security;
1933 struct socket_smack *ssp;
1934 struct socket *sock;
1937 if (value == NULL || size > SMK_LONGLABEL || size == 0)
1940 sp = smk_import(value, size);
1944 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1945 nsp->smk_inode = sp;
1946 nsp->smk_flags |= SMK_INODE_INSTANT;
1950 * The rest of the Smack xattrs are only on sockets.
1952 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1955 sock = SOCKET_I(inode);
1956 if (sock == NULL || sock->sk == NULL)
1959 ssp = sock->sk->sk_security;
1961 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1963 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1965 if (sock->sk->sk_family != PF_UNIX) {
1966 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1969 "Smack: \"%s\" netlbl error %d.\n",
1979 * smack_socket_post_create - finish socket setup
1981 * @family: protocol family
1986 * Sets the netlabel information on the socket
1988 * Returns 0 on success, and error code otherwise
1990 static int smack_socket_post_create(struct socket *sock, int family,
1991 int type, int protocol, int kern)
1993 if (family != PF_INET || sock->sk == NULL)
1996 * Set the outbound netlbl.
1998 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2002 * smack_socket_connect - connect access check
2004 * @sap: the other end
2005 * @addrlen: size of sap
2007 * Verifies that a connection may be possible
2009 * Returns 0 on success, and error code otherwise
2011 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2014 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
2016 if (addrlen < sizeof(struct sockaddr_in))
2019 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2023 * smack_flags_to_may - convert S_ to MAY_ values
2024 * @flags: the S_ value
2026 * Returns the equivalent MAY_ value
2028 static int smack_flags_to_may(int flags)
2032 if (flags & S_IRUGO)
2034 if (flags & S_IWUGO)
2036 if (flags & S_IXUGO)
2043 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2048 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2050 msg->security = smk_of_current();
2055 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2058 * Clears the blob pointer
2060 static void smack_msg_msg_free_security(struct msg_msg *msg)
2062 msg->security = NULL;
2066 * smack_of_shm - the smack pointer for the shm
2069 * Returns a pointer to the smack value
2071 static char *smack_of_shm(struct shmid_kernel *shp)
2073 return (char *)shp->shm_perm.security;
2077 * smack_shm_alloc_security - Set the security blob for shm
2082 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2084 struct kern_ipc_perm *isp = &shp->shm_perm;
2086 isp->security = smk_of_current();
2091 * smack_shm_free_security - Clear the security blob for shm
2094 * Clears the blob pointer
2096 static void smack_shm_free_security(struct shmid_kernel *shp)
2098 struct kern_ipc_perm *isp = &shp->shm_perm;
2100 isp->security = NULL;
2104 * smk_curacc_shm : check if current has access on shm
2106 * @access : access requested
2108 * Returns 0 if current has the requested access, error code otherwise
2110 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2112 char *ssp = smack_of_shm(shp);
2113 struct smk_audit_info ad;
2116 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2117 ad.a.u.ipc_id = shp->shm_perm.id;
2119 return smk_curacc(ssp, access, &ad);
2123 * smack_shm_associate - Smack access check for shm
2125 * @shmflg: access requested
2127 * Returns 0 if current has the requested access, error code otherwise
2129 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2133 may = smack_flags_to_may(shmflg);
2134 return smk_curacc_shm(shp, may);
2138 * smack_shm_shmctl - Smack access check for shm
2140 * @cmd: what it wants to do
2142 * Returns 0 if current has the requested access, error code otherwise
2144 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2157 may = MAY_READWRITE;
2162 * System level information.
2168 return smk_curacc_shm(shp, may);
2172 * smack_shm_shmat - Smack access for shmat
2175 * @shmflg: access requested
2177 * Returns 0 if current has the requested access, error code otherwise
2179 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2184 may = smack_flags_to_may(shmflg);
2185 return smk_curacc_shm(shp, may);
2189 * smack_of_sem - the smack pointer for the sem
2192 * Returns a pointer to the smack value
2194 static char *smack_of_sem(struct sem_array *sma)
2196 return (char *)sma->sem_perm.security;
2200 * smack_sem_alloc_security - Set the security blob for sem
2205 static int smack_sem_alloc_security(struct sem_array *sma)
2207 struct kern_ipc_perm *isp = &sma->sem_perm;
2209 isp->security = smk_of_current();
2214 * smack_sem_free_security - Clear the security blob for sem
2217 * Clears the blob pointer
2219 static void smack_sem_free_security(struct sem_array *sma)
2221 struct kern_ipc_perm *isp = &sma->sem_perm;
2223 isp->security = NULL;
2227 * smk_curacc_sem : check if current has access on sem
2229 * @access : access requested
2231 * Returns 0 if current has the requested access, error code otherwise
2233 static int smk_curacc_sem(struct sem_array *sma, int access)
2235 char *ssp = smack_of_sem(sma);
2236 struct smk_audit_info ad;
2239 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2240 ad.a.u.ipc_id = sma->sem_perm.id;
2242 return smk_curacc(ssp, access, &ad);
2246 * smack_sem_associate - Smack access check for sem
2248 * @semflg: access requested
2250 * Returns 0 if current has the requested access, error code otherwise
2252 static int smack_sem_associate(struct sem_array *sma, int semflg)
2256 may = smack_flags_to_may(semflg);
2257 return smk_curacc_sem(sma, may);
2261 * smack_sem_shmctl - Smack access check for sem
2263 * @cmd: what it wants to do
2265 * Returns 0 if current has the requested access, error code otherwise
2267 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2285 may = MAY_READWRITE;
2290 * System level information
2297 return smk_curacc_sem(sma, may);
2301 * smack_sem_semop - Smack checks of semaphore operations
2307 * Treated as read and write in all cases.
2309 * Returns 0 if access is allowed, error code otherwise
2311 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2312 unsigned nsops, int alter)
2314 return smk_curacc_sem(sma, MAY_READWRITE);
2318 * smack_msg_alloc_security - Set the security blob for msg
2323 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2325 struct kern_ipc_perm *kisp = &msq->q_perm;
2327 kisp->security = smk_of_current();
2332 * smack_msg_free_security - Clear the security blob for msg
2335 * Clears the blob pointer
2337 static void smack_msg_queue_free_security(struct msg_queue *msq)
2339 struct kern_ipc_perm *kisp = &msq->q_perm;
2341 kisp->security = NULL;
2345 * smack_of_msq - the smack pointer for the msq
2348 * Returns a pointer to the smack value
2350 static char *smack_of_msq(struct msg_queue *msq)
2352 return (char *)msq->q_perm.security;
2356 * smk_curacc_msq : helper to check if current has access on msq
2358 * @access : access requested
2360 * return 0 if current has access, error otherwise
2362 static int smk_curacc_msq(struct msg_queue *msq, int access)
2364 char *msp = smack_of_msq(msq);
2365 struct smk_audit_info ad;
2368 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2369 ad.a.u.ipc_id = msq->q_perm.id;
2371 return smk_curacc(msp, access, &ad);
2375 * smack_msg_queue_associate - Smack access check for msg_queue
2377 * @msqflg: access requested
2379 * Returns 0 if current has the requested access, error code otherwise
2381 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2385 may = smack_flags_to_may(msqflg);
2386 return smk_curacc_msq(msq, may);
2390 * smack_msg_queue_msgctl - Smack access check for msg_queue
2392 * @cmd: what it wants to do
2394 * Returns 0 if current has the requested access, error code otherwise
2396 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2407 may = MAY_READWRITE;
2412 * System level information
2419 return smk_curacc_msq(msq, may);
2423 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2426 * @msqflg: access requested
2428 * Returns 0 if current has the requested access, error code otherwise
2430 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2435 may = smack_flags_to_may(msqflg);
2436 return smk_curacc_msq(msq, may);
2440 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2447 * Returns 0 if current has read and write access, error code otherwise
2449 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2450 struct task_struct *target, long type, int mode)
2452 return smk_curacc_msq(msq, MAY_READWRITE);
2456 * smack_ipc_permission - Smack access for ipc_permission()
2457 * @ipp: the object permissions
2458 * @flag: access requested
2460 * Returns 0 if current has read and write access, error code otherwise
2462 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2464 char *isp = ipp->security;
2465 int may = smack_flags_to_may(flag);
2466 struct smk_audit_info ad;
2469 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2470 ad.a.u.ipc_id = ipp->id;
2472 return smk_curacc(isp, may, &ad);
2476 * smack_ipc_getsecid - Extract smack security id
2477 * @ipp: the object permissions
2478 * @secid: where result will be saved
2480 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2482 char *smack = ipp->security;
2484 *secid = smack_to_secid(smack);
2488 * smack_d_instantiate - Make sure the blob is correct on an inode
2489 * @opt_dentry: dentry where inode will be attached
2490 * @inode: the object
2492 * Set the inode's security blob if it hasn't been done already.
2494 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2496 struct super_block *sbp;
2497 struct superblock_smack *sbsp;
2498 struct inode_smack *isp;
2499 char *csp = smk_of_current();
2502 char trattr[TRANS_TRUE_SIZE];
2510 isp = inode->i_security;
2512 mutex_lock(&isp->smk_lock);
2514 * If the inode is already instantiated
2515 * take the quick way out
2517 if (isp->smk_flags & SMK_INODE_INSTANT)
2521 sbsp = sbp->s_security;
2523 * We're going to use the superblock default label
2524 * if there's no label on the file.
2526 final = sbsp->smk_default;
2529 * If this is the root inode the superblock
2530 * may be in the process of initialization.
2531 * If that is the case use the root value out
2532 * of the superblock.
2534 if (opt_dentry->d_parent == opt_dentry) {
2535 isp->smk_inode = sbsp->smk_root;
2536 isp->smk_flags |= SMK_INODE_INSTANT;
2541 * This is pretty hackish.
2542 * Casey says that we shouldn't have to do
2543 * file system specific code, but it does help
2544 * with keeping it simple.
2546 switch (sbp->s_magic) {
2549 * Casey says that it's a little embarrassing
2550 * that the smack file system doesn't do
2551 * extended attributes.
2553 final = smack_known_star.smk_known;
2557 * Casey says pipes are easy (?)
2559 final = smack_known_star.smk_known;
2561 case DEVPTS_SUPER_MAGIC:
2563 * devpts seems content with the label of the task.
2564 * Programs that change smack have to treat the
2571 * Socket access is controlled by the socket
2572 * structures associated with the task involved.
2574 final = smack_known_star.smk_known;
2576 case PROC_SUPER_MAGIC:
2578 * Casey says procfs appears not to care.
2579 * The superblock default suffices.
2584 * Device labels should come from the filesystem,
2585 * but watch out, because they're volitile,
2586 * getting recreated on every reboot.
2588 final = smack_known_star.smk_known;
2592 * If a smack value has been set we want to use it,
2593 * but since tmpfs isn't giving us the opportunity
2594 * to set mount options simulate setting the
2595 * superblock default.
2599 * This isn't an understood special case.
2600 * Get the value from the xattr.
2604 * UNIX domain sockets use lower level socket data.
2606 if (S_ISSOCK(inode->i_mode)) {
2607 final = smack_known_star.smk_known;
2611 * No xattr support means, alas, no SMACK label.
2612 * Use the aforeapplied default.
2613 * It would be curious if the label of the task
2614 * does not match that assigned.
2616 if (inode->i_op->getxattr == NULL)
2619 * Get the dentry for xattr.
2621 dp = dget(opt_dentry);
2622 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2623 if (fetched != NULL)
2627 * Transmuting directory
2629 if (S_ISDIR(inode->i_mode)) {
2631 * If this is a new directory and the label was
2632 * transmuted when the inode was initialized
2633 * set the transmute attribute on the directory
2634 * and mark the inode.
2636 * If there is a transmute attribute on the
2637 * directory mark the inode.
2639 if (isp->smk_flags & SMK_INODE_CHANGED) {
2640 isp->smk_flags &= ~SMK_INODE_CHANGED;
2641 rc = inode->i_op->setxattr(dp,
2642 XATTR_NAME_SMACKTRANSMUTE,
2643 TRANS_TRUE, TRANS_TRUE_SIZE,
2646 rc = inode->i_op->getxattr(dp,
2647 XATTR_NAME_SMACKTRANSMUTE, trattr,
2649 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2650 TRANS_TRUE_SIZE) != 0)
2654 transflag = SMK_INODE_TRANSMUTE;
2656 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2657 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2664 isp->smk_inode = csp;
2666 isp->smk_inode = final;
2668 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2671 mutex_unlock(&isp->smk_lock);
2676 * smack_getprocattr - Smack process attribute access
2677 * @p: the object task
2678 * @name: the name of the attribute in /proc/.../attr
2679 * @value: where to put the result
2681 * Places a copy of the task Smack into value
2683 * Returns the length of the smack label or an error code
2685 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2690 if (strcmp(name, "current") != 0)
2693 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2703 * smack_setprocattr - Smack process attribute setting
2704 * @p: the object task
2705 * @name: the name of the attribute in /proc/.../attr
2706 * @value: the value to set
2707 * @size: the size of the value
2709 * Sets the Smack value of the task. Only setting self
2710 * is permitted and only with privilege
2712 * Returns the length of the smack label or an error code
2714 static int smack_setprocattr(struct task_struct *p, char *name,
2715 void *value, size_t size)
2718 struct task_smack *tsp;
2719 struct task_smack *oldtsp;
2724 * Changing another process' Smack value is too dangerous
2725 * and supports no sane use case.
2730 if (!capable(CAP_MAC_ADMIN))
2733 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2736 if (strcmp(name, "current") != 0)
2739 newsmack = smk_import(value, size);
2740 if (newsmack == NULL)
2744 * No process is ever allowed the web ("@") label.
2746 if (newsmack == smack_known_web.smk_known)
2749 oldtsp = p->cred->security;
2750 new = prepare_creds();
2754 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
2759 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2763 new->security = tsp;
2769 * smack_unix_stream_connect - Smack access on UDS
2771 * @other: the other sock
2774 * Return 0 if a subject with the smack of sock could access
2775 * an object with the smack of other, otherwise an error code
2777 static int smack_unix_stream_connect(struct sock *sock,
2778 struct sock *other, struct sock *newsk)
2780 struct socket_smack *ssp = sock->sk_security;
2781 struct socket_smack *osp = other->sk_security;
2782 struct socket_smack *nsp = newsk->sk_security;
2783 struct smk_audit_info ad;
2787 struct lsm_network_audit net;
2789 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2790 smk_ad_setfield_u_net_sk(&ad, other);
2793 if (!capable(CAP_MAC_OVERRIDE))
2794 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2797 * Cross reference the peer labels for SO_PEERSEC.
2800 nsp->smk_packet = ssp->smk_out;
2801 ssp->smk_packet = osp->smk_out;
2808 * smack_unix_may_send - Smack access on UDS
2810 * @other: the other socket
2812 * Return 0 if a subject with the smack of sock could access
2813 * an object with the smack of other, otherwise an error code
2815 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2817 struct socket_smack *ssp = sock->sk->sk_security;
2818 struct socket_smack *osp = other->sk->sk_security;
2819 struct smk_audit_info ad;
2823 struct lsm_network_audit net;
2825 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2826 smk_ad_setfield_u_net_sk(&ad, other->sk);
2829 if (!capable(CAP_MAC_OVERRIDE))
2830 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2836 * smack_socket_sendmsg - Smack check based on destination host
2839 * @size: the size of the message
2841 * Return 0 if the current subject can write to the destination
2842 * host. This is only a question if the destination is a single
2845 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2848 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2851 * Perfectly reasonable for this to be NULL
2853 if (sip == NULL || sip->sin_family != AF_INET)
2856 return smack_netlabel_send(sock->sk, sip);
2860 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2861 * @sap: netlabel secattr
2862 * @ssp: socket security information
2864 * Returns a pointer to a Smack label found on the label list.
2866 static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
2867 struct socket_smack *ssp)
2869 struct smack_known *kp;
2873 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2875 * Looks like a CIPSO packet.
2876 * If there are flags but no level netlabel isn't
2877 * behaving the way we expect it to.
2879 * Look it up in the label table
2880 * Without guidance regarding the smack value
2881 * for the packet fall back on the network
2885 list_for_each_entry(kp, &smack_known_list, list) {
2886 if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
2888 if (memcmp(sap->attr.mls.cat,
2889 kp->smk_netlabel.attr.mls.cat,
2898 return kp->smk_known;
2900 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2901 return smack_known_web.smk_known;
2902 return smack_known_star.smk_known;
2904 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2906 * Looks like a fallback, which gives us a secid.
2908 sp = smack_from_secid(sap->attr.secid);
2910 * This has got to be a bug because it is
2911 * impossible to specify a fallback without
2912 * specifying the label, which will ensure
2913 * it has a secid, and the only way to get a
2914 * secid is from a fallback.
2920 * Without guidance regarding the smack value
2921 * for the packet fall back on the network
2924 return smack_net_ambient;
2928 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2932 * Returns 0 if the packet should be delivered, an error code otherwise
2934 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2936 struct netlbl_lsm_secattr secattr;
2937 struct socket_smack *ssp = sk->sk_security;
2940 struct smk_audit_info ad;
2942 struct lsm_network_audit net;
2944 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2948 * Translate what netlabel gave us.
2950 netlbl_secattr_init(&secattr);
2952 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2954 csp = smack_from_secattr(&secattr, ssp);
2956 csp = smack_net_ambient;
2958 netlbl_secattr_destroy(&secattr);
2961 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2962 ad.a.u.net->family = sk->sk_family;
2963 ad.a.u.net->netif = skb->skb_iif;
2964 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2967 * Receiving a packet requires that the other end
2968 * be able to write here. Read access is not required.
2969 * This is the simplist possible security model
2972 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2974 netlbl_skbuff_err(skb, rc, 0);
2979 * smack_socket_getpeersec_stream - pull in packet label
2981 * @optval: user's destination
2982 * @optlen: size thereof
2985 * returns zero on success, an error code otherwise
2987 static int smack_socket_getpeersec_stream(struct socket *sock,
2988 char __user *optval,
2989 int __user *optlen, unsigned len)
2991 struct socket_smack *ssp;
2996 ssp = sock->sk->sk_security;
2997 if (ssp->smk_packet != NULL) {
2998 rcp = ssp->smk_packet;
2999 slen = strlen(rcp) + 1;
3004 else if (copy_to_user(optval, rcp, slen) != 0)
3007 if (put_user(slen, optlen) != 0)
3015 * smack_socket_getpeersec_dgram - pull in packet label
3016 * @sock: the peer socket
3018 * @secid: pointer to where to put the secid of the packet
3020 * Sets the netlabel socket state on sk from parent
3022 static int smack_socket_getpeersec_dgram(struct socket *sock,
3023 struct sk_buff *skb, u32 *secid)
3026 struct netlbl_lsm_secattr secattr;
3027 struct socket_smack *ssp = NULL;
3029 int family = PF_UNSPEC;
3030 u32 s = 0; /* 0 is the invalid secid */
3034 if (skb->protocol == htons(ETH_P_IP))
3036 else if (skb->protocol == htons(ETH_P_IPV6))
3039 if (family == PF_UNSPEC && sock != NULL)
3040 family = sock->sk->sk_family;
3042 if (family == PF_UNIX) {
3043 ssp = sock->sk->sk_security;
3044 s = smack_to_secid(ssp->smk_out);
3045 } else if (family == PF_INET || family == PF_INET6) {
3047 * Translate what netlabel gave us.
3049 if (sock != NULL && sock->sk != NULL)
3050 ssp = sock->sk->sk_security;
3051 netlbl_secattr_init(&secattr);
3052 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3054 sp = smack_from_secattr(&secattr, ssp);
3055 s = smack_to_secid(sp);
3057 netlbl_secattr_destroy(&secattr);
3066 * smack_sock_graft - Initialize a newly created socket with an existing sock
3068 * @parent: parent socket
3070 * Set the smk_{in,out} state of an existing sock based on the process that
3071 * is creating the new socket.
3073 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3075 struct socket_smack *ssp;
3078 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3081 ssp = sk->sk_security;
3082 ssp->smk_in = ssp->smk_out = smk_of_current();
3083 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3087 * smack_inet_conn_request - Smack access check on connect
3088 * @sk: socket involved
3092 * Returns 0 if a task with the packet label could write to
3093 * the socket, otherwise an error code
3095 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3096 struct request_sock *req)
3098 u16 family = sk->sk_family;
3099 struct smack_known *skp;
3100 struct socket_smack *ssp = sk->sk_security;
3101 struct netlbl_lsm_secattr secattr;
3102 struct sockaddr_in addr;
3107 struct smk_audit_info ad;
3109 struct lsm_network_audit net;
3112 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3113 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3116 netlbl_secattr_init(&secattr);
3117 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3119 sp = smack_from_secattr(&secattr, ssp);
3121 sp = smack_known_huh.smk_known;
3122 netlbl_secattr_destroy(&secattr);
3125 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3126 ad.a.u.net->family = family;
3127 ad.a.u.net->netif = skb->skb_iif;
3128 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3131 * Receiving a packet requires that the other end be able to write
3132 * here. Read access is not required.
3134 rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
3139 * Save the peer's label in the request_sock so we can later setup
3140 * smk_packet in the child socket so that SO_PEERCRED can report it.
3142 req->peer_secid = smack_to_secid(sp);
3145 * We need to decide if we want to label the incoming connection here
3146 * if we do we only need to label the request_sock and the stack will
3147 * propagate the wire-label to the sock when it is created.
3150 addr.sin_addr.s_addr = hdr->saddr;
3152 hsp = smack_host_label(&addr);
3156 skp = smk_find_entry(sp);
3157 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3159 netlbl_req_delattr(req);
3165 * smack_inet_csk_clone - Copy the connection information to the new socket
3166 * @sk: the new socket
3167 * @req: the connection's request_sock
3169 * Transfer the connection's peer label to the newly created socket.
3171 static void smack_inet_csk_clone(struct sock *sk,
3172 const struct request_sock *req)
3174 struct socket_smack *ssp = sk->sk_security;
3176 if (req->peer_secid != 0)
3177 ssp->smk_packet = smack_from_secid(req->peer_secid);
3179 ssp->smk_packet = NULL;
3183 * Key management security hooks
3185 * Casey has not tested key support very heavily.
3186 * The permission check is most likely too restrictive.
3187 * If you care about keys please have a look.
3192 * smack_key_alloc - Set the key security blob
3194 * @cred: the credentials to use
3197 * No allocation required
3201 static int smack_key_alloc(struct key *key, const struct cred *cred,
3202 unsigned long flags)
3204 key->security = smk_of_task(cred->security);
3209 * smack_key_free - Clear the key security blob
3212 * Clear the blob pointer
3214 static void smack_key_free(struct key *key)
3216 key->security = NULL;
3220 * smack_key_permission - Smack access on a key
3221 * @key_ref: gets to the object
3222 * @cred: the credentials to use
3225 * Return 0 if the task has read and write to the object,
3226 * an error code otherwise
3228 static int smack_key_permission(key_ref_t key_ref,
3229 const struct cred *cred, key_perm_t perm)
3232 struct smk_audit_info ad;
3233 char *tsp = smk_of_task(cred->security);
3235 keyp = key_ref_to_ptr(key_ref);
3239 * If the key hasn't been initialized give it access so that
3242 if (keyp->security == NULL)
3245 * This should not occur
3250 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3251 ad.a.u.key_struct.key = keyp->serial;
3252 ad.a.u.key_struct.key_desc = keyp->description;
3254 return smk_access(tsp, keyp->security,
3255 MAY_READWRITE, &ad);
3257 #endif /* CONFIG_KEYS */
3262 * Audit requires a unique representation of each Smack specific
3263 * rule. This unique representation is used to distinguish the
3264 * object to be audited from remaining kernel objects and also
3265 * works as a glue between the audit hooks.
3267 * Since repository entries are added but never deleted, we'll use
3268 * the smack_known label address related to the given audit rule as
3269 * the needed unique representation. This also better fits the smack
3270 * model where nearly everything is a label.
3275 * smack_audit_rule_init - Initialize a smack audit rule
3276 * @field: audit rule fields given from user-space (audit.h)
3277 * @op: required testing operator (=, !=, >, <, ...)
3278 * @rulestr: smack label to be audited
3279 * @vrule: pointer to save our own audit rule representation
3281 * Prepare to audit cases where (@field @op @rulestr) is true.
3282 * The label to be audited is created if necessay.
3284 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3286 char **rule = (char **)vrule;
3289 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3292 if (op != Audit_equal && op != Audit_not_equal)
3295 *rule = smk_import(rulestr, 0);
3301 * smack_audit_rule_known - Distinguish Smack audit rules
3302 * @krule: rule of interest, in Audit kernel representation format
3304 * This is used to filter Smack rules from remaining Audit ones.
3305 * If it's proved that this rule belongs to us, the
3306 * audit_rule_match hook will be called to do the final judgement.
3308 static int smack_audit_rule_known(struct audit_krule *krule)
3310 struct audit_field *f;
3313 for (i = 0; i < krule->field_count; i++) {
3314 f = &krule->fields[i];
3316 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3324 * smack_audit_rule_match - Audit given object ?
3325 * @secid: security id for identifying the object to test
3326 * @field: audit rule flags given from user-space
3327 * @op: required testing operator
3328 * @vrule: smack internal rule presentation
3329 * @actx: audit context associated with the check
3331 * The core Audit hook. It's used to take the decision of
3332 * whether to audit or not to audit a given object.
3334 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3335 struct audit_context *actx)
3341 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
3342 "Smack: missing rule\n");
3346 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3349 smack = smack_from_secid(secid);
3352 * No need to do string comparisons. If a match occurs,
3353 * both pointers will point to the same smack_known
3356 if (op == Audit_equal)
3357 return (rule == smack);
3358 if (op == Audit_not_equal)
3359 return (rule != smack);
3365 * smack_audit_rule_free - free smack rule representation
3366 * @vrule: rule to be freed.
3368 * No memory was allocated.
3370 static void smack_audit_rule_free(void *vrule)
3375 #endif /* CONFIG_AUDIT */
3378 * smack_secid_to_secctx - return the smack label for a secid
3379 * @secid: incoming integer
3380 * @secdata: destination
3381 * @seclen: how long it is
3383 * Exists for networking code.
3385 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3387 char *sp = smack_from_secid(secid);
3391 *seclen = strlen(sp);
3396 * smack_secctx_to_secid - return the secid for a smack label
3397 * @secdata: smack label
3398 * @seclen: how long result is
3399 * @secid: outgoing integer
3401 * Exists for audit and networking code.
3403 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3405 *secid = smack_to_secid(secdata);
3410 * smack_release_secctx - don't do anything.
3414 * Exists to make sure nothing gets done, and properly
3416 static void smack_release_secctx(char *secdata, u32 seclen)
3420 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3422 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3425 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3427 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3430 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3433 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3441 struct security_operations smack_ops = {
3444 .ptrace_access_check = smack_ptrace_access_check,
3445 .ptrace_traceme = smack_ptrace_traceme,
3446 .syslog = smack_syslog,
3448 .sb_alloc_security = smack_sb_alloc_security,
3449 .sb_free_security = smack_sb_free_security,
3450 .sb_copy_data = smack_sb_copy_data,
3451 .sb_kern_mount = smack_sb_kern_mount,
3452 .sb_statfs = smack_sb_statfs,
3453 .sb_mount = smack_sb_mount,
3454 .sb_umount = smack_sb_umount,
3456 .bprm_set_creds = smack_bprm_set_creds,
3457 .bprm_committing_creds = smack_bprm_committing_creds,
3458 .bprm_secureexec = smack_bprm_secureexec,
3460 .inode_alloc_security = smack_inode_alloc_security,
3461 .inode_free_security = smack_inode_free_security,
3462 .inode_init_security = smack_inode_init_security,
3463 .inode_link = smack_inode_link,
3464 .inode_unlink = smack_inode_unlink,
3465 .inode_rmdir = smack_inode_rmdir,
3466 .inode_rename = smack_inode_rename,
3467 .inode_permission = smack_inode_permission,
3468 .inode_setattr = smack_inode_setattr,
3469 .inode_getattr = smack_inode_getattr,
3470 .inode_setxattr = smack_inode_setxattr,
3471 .inode_post_setxattr = smack_inode_post_setxattr,
3472 .inode_getxattr = smack_inode_getxattr,
3473 .inode_removexattr = smack_inode_removexattr,
3474 .inode_getsecurity = smack_inode_getsecurity,
3475 .inode_setsecurity = smack_inode_setsecurity,
3476 .inode_listsecurity = smack_inode_listsecurity,
3477 .inode_getsecid = smack_inode_getsecid,
3479 .file_permission = smack_file_permission,
3480 .file_alloc_security = smack_file_alloc_security,
3481 .file_free_security = smack_file_free_security,
3482 .file_ioctl = smack_file_ioctl,
3483 .file_lock = smack_file_lock,
3484 .file_fcntl = smack_file_fcntl,
3485 .file_mmap = smack_file_mmap,
3486 .file_set_fowner = smack_file_set_fowner,
3487 .file_send_sigiotask = smack_file_send_sigiotask,
3488 .file_receive = smack_file_receive,
3490 .file_open = smack_file_open,
3492 .cred_alloc_blank = smack_cred_alloc_blank,
3493 .cred_free = smack_cred_free,
3494 .cred_prepare = smack_cred_prepare,
3495 .cred_transfer = smack_cred_transfer,
3496 .kernel_act_as = smack_kernel_act_as,
3497 .kernel_create_files_as = smack_kernel_create_files_as,
3498 .task_setpgid = smack_task_setpgid,
3499 .task_getpgid = smack_task_getpgid,
3500 .task_getsid = smack_task_getsid,
3501 .task_getsecid = smack_task_getsecid,
3502 .task_setnice = smack_task_setnice,
3503 .task_setioprio = smack_task_setioprio,
3504 .task_getioprio = smack_task_getioprio,
3505 .task_setscheduler = smack_task_setscheduler,
3506 .task_getscheduler = smack_task_getscheduler,
3507 .task_movememory = smack_task_movememory,
3508 .task_kill = smack_task_kill,
3509 .task_wait = smack_task_wait,
3510 .task_to_inode = smack_task_to_inode,
3512 .ipc_permission = smack_ipc_permission,
3513 .ipc_getsecid = smack_ipc_getsecid,
3515 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3516 .msg_msg_free_security = smack_msg_msg_free_security,
3518 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3519 .msg_queue_free_security = smack_msg_queue_free_security,
3520 .msg_queue_associate = smack_msg_queue_associate,
3521 .msg_queue_msgctl = smack_msg_queue_msgctl,
3522 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3523 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3525 .shm_alloc_security = smack_shm_alloc_security,
3526 .shm_free_security = smack_shm_free_security,
3527 .shm_associate = smack_shm_associate,
3528 .shm_shmctl = smack_shm_shmctl,
3529 .shm_shmat = smack_shm_shmat,
3531 .sem_alloc_security = smack_sem_alloc_security,
3532 .sem_free_security = smack_sem_free_security,
3533 .sem_associate = smack_sem_associate,
3534 .sem_semctl = smack_sem_semctl,
3535 .sem_semop = smack_sem_semop,
3537 .d_instantiate = smack_d_instantiate,
3539 .getprocattr = smack_getprocattr,
3540 .setprocattr = smack_setprocattr,
3542 .unix_stream_connect = smack_unix_stream_connect,
3543 .unix_may_send = smack_unix_may_send,
3545 .socket_post_create = smack_socket_post_create,
3546 .socket_connect = smack_socket_connect,
3547 .socket_sendmsg = smack_socket_sendmsg,
3548 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3549 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3550 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3551 .sk_alloc_security = smack_sk_alloc_security,
3552 .sk_free_security = smack_sk_free_security,
3553 .sock_graft = smack_sock_graft,
3554 .inet_conn_request = smack_inet_conn_request,
3555 .inet_csk_clone = smack_inet_csk_clone,
3557 /* key management security hooks */
3559 .key_alloc = smack_key_alloc,
3560 .key_free = smack_key_free,
3561 .key_permission = smack_key_permission,
3562 #endif /* CONFIG_KEYS */
3566 .audit_rule_init = smack_audit_rule_init,
3567 .audit_rule_known = smack_audit_rule_known,
3568 .audit_rule_match = smack_audit_rule_match,
3569 .audit_rule_free = smack_audit_rule_free,
3570 #endif /* CONFIG_AUDIT */
3572 .secid_to_secctx = smack_secid_to_secctx,
3573 .secctx_to_secid = smack_secctx_to_secid,
3574 .release_secctx = smack_release_secctx,
3575 .inode_notifysecctx = smack_inode_notifysecctx,
3576 .inode_setsecctx = smack_inode_setsecctx,
3577 .inode_getsecctx = smack_inode_getsecctx,
3581 static __init void init_smack_known_list(void)
3584 * Initialize rule list locks
3586 mutex_init(&smack_known_huh.smk_rules_lock);
3587 mutex_init(&smack_known_hat.smk_rules_lock);
3588 mutex_init(&smack_known_floor.smk_rules_lock);
3589 mutex_init(&smack_known_star.smk_rules_lock);
3590 mutex_init(&smack_known_invalid.smk_rules_lock);
3591 mutex_init(&smack_known_web.smk_rules_lock);
3593 * Initialize rule lists
3595 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3596 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3597 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3598 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3599 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3600 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3602 * Create the known labels list
3604 list_add(&smack_known_huh.list, &smack_known_list);
3605 list_add(&smack_known_hat.list, &smack_known_list);
3606 list_add(&smack_known_star.list, &smack_known_list);
3607 list_add(&smack_known_floor.list, &smack_known_list);
3608 list_add(&smack_known_invalid.list, &smack_known_list);
3609 list_add(&smack_known_web.list, &smack_known_list);
3613 * smack_init - initialize the smack system
3617 static __init int smack_init(void)
3620 struct task_smack *tsp;
3622 if (!security_module_enable(&smack_ops))
3625 tsp = new_task_smack(smack_known_floor.smk_known,
3626 smack_known_floor.smk_known, GFP_KERNEL);
3630 printk(KERN_INFO "Smack: Initializing.\n");
3633 * Set the security state for the initial task.
3635 cred = (struct cred *) current->cred;
3636 cred->security = tsp;
3638 /* initialize the smack_known_list */
3639 init_smack_known_list();
3644 if (register_security(&smack_ops))
3645 panic("smack: Unable to register with kernel.\n");
3651 * Smack requires early initialization in order to label
3652 * all processes and objects when they are created.
3654 security_initcall(smack_init);