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/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
43 #define task_security(task) (task_cred_xxx((task), security))
45 #define TRANS_TRUE "TRUE"
46 #define TRANS_TRUE_SIZE 4
48 #define SMK_CONNECTING 0
49 #define SMK_RECEIVING 1
52 LIST_HEAD(smk_ipv6_port_list);
53 static struct kmem_cache *smack_inode_cache;
56 * smk_fetch - Fetch the smack label from a file.
57 * @ip: a pointer to the inode
58 * @dp: a pointer to the dentry
60 * Returns a pointer to the master list entry for the Smack label
61 * or NULL if there was no label to fetch.
63 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
68 struct smack_known *skp = NULL;
70 if (ip->i_op->getxattr == NULL)
73 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
77 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
79 skp = smk_import_entry(buffer, rc);
87 * new_inode_smack - allocate an inode security blob
88 * @smack: a pointer to the Smack label to use in the blob
90 * Returns the new blob or NULL if there's no memory available
92 struct inode_smack *new_inode_smack(char *smack)
94 struct inode_smack *isp;
96 isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS);
100 isp->smk_inode = smack;
102 mutex_init(&isp->smk_lock);
108 * new_task_smack - allocate a task security blob
109 * @smack: a pointer to the Smack label to use in the blob
111 * Returns the new blob or NULL if there's no memory available
113 static struct task_smack *new_task_smack(struct smack_known *task,
114 struct smack_known *forked, gfp_t gfp)
116 struct task_smack *tsp;
118 tsp = kzalloc(sizeof(struct task_smack), gfp);
122 tsp->smk_task = task;
123 tsp->smk_forked = forked;
124 INIT_LIST_HEAD(&tsp->smk_rules);
125 mutex_init(&tsp->smk_rules_lock);
131 * smk_copy_rules - copy a rule set
132 * @nhead - new rules header pointer
133 * @ohead - old rules header pointer
135 * Returns 0 on success, -ENOMEM on error
137 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
140 struct smack_rule *nrp;
141 struct smack_rule *orp;
144 INIT_LIST_HEAD(nhead);
146 list_for_each_entry_rcu(orp, ohead, list) {
147 nrp = kzalloc(sizeof(struct smack_rule), gfp);
153 list_add_rcu(&nrp->list, nhead);
160 * We he, that is fun!
164 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
165 * @ctp: child task pointer
166 * @mode: ptrace attachment mode
168 * Returns 0 if access is OK, an error code otherwise
170 * Do the capability checks, and require read and write.
172 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
175 struct smk_audit_info ad;
176 struct smack_known *skp;
178 rc = cap_ptrace_access_check(ctp, mode);
182 skp = smk_of_task(task_security(ctp));
183 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
184 smk_ad_setfield_u_tsk(&ad, ctp);
186 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
191 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
192 * @ptp: parent task pointer
194 * Returns 0 if access is OK, an error code otherwise
196 * Do the capability checks, and require read and write.
198 static int smack_ptrace_traceme(struct task_struct *ptp)
201 struct smk_audit_info ad;
202 struct smack_known *skp;
204 rc = cap_ptrace_traceme(ptp);
208 skp = smk_of_task(task_security(ptp));
209 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
210 smk_ad_setfield_u_tsk(&ad, ptp);
212 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
217 * smack_syslog - Smack approval on syslog
218 * @type: message type
220 * Require that the task has the floor label
222 * Returns 0 on success, error code otherwise.
224 static int smack_syslog(int typefrom_file)
227 struct smack_known *skp = smk_of_current();
229 if (smack_privileged(CAP_MAC_OVERRIDE))
232 if (skp != &smack_known_floor)
244 * smack_sb_alloc_security - allocate a superblock blob
245 * @sb: the superblock getting the blob
247 * Returns 0 on success or -ENOMEM on error.
249 static int smack_sb_alloc_security(struct super_block *sb)
251 struct superblock_smack *sbsp;
253 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
258 sbsp->smk_root = smack_known_floor.smk_known;
259 sbsp->smk_default = smack_known_floor.smk_known;
260 sbsp->smk_floor = smack_known_floor.smk_known;
261 sbsp->smk_hat = smack_known_hat.smk_known;
263 * smk_initialized will be zero from kzalloc.
265 sb->s_security = sbsp;
271 * smack_sb_free_security - free a superblock blob
272 * @sb: the superblock getting the blob
275 static void smack_sb_free_security(struct super_block *sb)
277 kfree(sb->s_security);
278 sb->s_security = NULL;
282 * smack_sb_copy_data - copy mount options data for processing
283 * @orig: where to start
284 * @smackopts: mount options string
286 * Returns 0 on success or -ENOMEM on error.
288 * Copy the Smack specific mount options out of the mount
291 static int smack_sb_copy_data(char *orig, char *smackopts)
293 char *cp, *commap, *otheropts, *dp;
295 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
296 if (otheropts == NULL)
299 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
300 if (strstr(cp, SMK_FSDEFAULT) == cp)
302 else if (strstr(cp, SMK_FSFLOOR) == cp)
304 else if (strstr(cp, SMK_FSHAT) == cp)
306 else if (strstr(cp, SMK_FSROOT) == cp)
308 else if (strstr(cp, SMK_FSTRANS) == cp)
313 commap = strchr(cp, ',');
322 strcpy(orig, otheropts);
323 free_page((unsigned long)otheropts);
329 * smack_sb_kern_mount - Smack specific mount processing
330 * @sb: the file system superblock
331 * @flags: the mount flags
332 * @data: the smack mount options
334 * Returns 0 on success, an error code on failure
336 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
338 struct dentry *root = sb->s_root;
339 struct inode *inode = root->d_inode;
340 struct superblock_smack *sp = sb->s_security;
341 struct inode_smack *isp;
347 if (sp->smk_initialized)
350 sp->smk_initialized = 1;
352 for (op = data; op != NULL; op = commap) {
353 commap = strchr(op, ',');
357 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
358 op += strlen(SMK_FSHAT);
359 nsp = smk_import(op, 0);
362 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
363 op += strlen(SMK_FSFLOOR);
364 nsp = smk_import(op, 0);
367 } else if (strncmp(op, SMK_FSDEFAULT,
368 strlen(SMK_FSDEFAULT)) == 0) {
369 op += strlen(SMK_FSDEFAULT);
370 nsp = smk_import(op, 0);
372 sp->smk_default = nsp;
373 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
374 op += strlen(SMK_FSROOT);
375 nsp = smk_import(op, 0);
378 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
379 op += strlen(SMK_FSTRANS);
380 nsp = smk_import(op, 0);
389 * Initialize the root inode.
391 isp = inode->i_security;
392 if (inode->i_security == NULL) {
393 inode->i_security = new_inode_smack(sp->smk_root);
394 isp = inode->i_security;
396 isp->smk_inode = sp->smk_root;
399 isp->smk_flags |= SMK_INODE_TRANSMUTE;
405 * smack_sb_statfs - Smack check on statfs
406 * @dentry: identifies the file system in question
408 * Returns 0 if current can read the floor of the filesystem,
409 * and error code otherwise
411 static int smack_sb_statfs(struct dentry *dentry)
413 struct superblock_smack *sbp = dentry->d_sb->s_security;
415 struct smk_audit_info ad;
417 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
418 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
420 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
425 * smack_sb_mount - Smack check for mounting
432 * Returns 0 if current can write the floor of the filesystem
433 * being mounted on, an error code otherwise.
435 static int smack_sb_mount(char *dev_name, struct path *path,
436 char *type, unsigned long flags, void *data)
438 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
439 struct smk_audit_info ad;
441 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
442 smk_ad_setfield_u_fs_path(&ad, *path);
444 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
448 * smack_sb_umount - Smack check for unmounting
449 * @mnt: file system to unmount
452 * Returns 0 if current can write the floor of the filesystem
453 * being unmounted, an error code otherwise.
455 static int smack_sb_umount(struct vfsmount *mnt, int flags)
457 struct superblock_smack *sbp;
458 struct smk_audit_info ad;
461 path.dentry = mnt->mnt_root;
464 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
465 smk_ad_setfield_u_fs_path(&ad, path);
467 sbp = mnt->mnt_sb->s_security;
468 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
476 * smack_bprm_set_creds - set creds for exec
477 * @bprm: the exec information
479 * Returns 0 if it gets a blob, -ENOMEM otherwise
481 static int smack_bprm_set_creds(struct linux_binprm *bprm)
483 struct inode *inode = bprm->file->f_path.dentry->d_inode;
484 struct task_smack *bsp = bprm->cred->security;
485 struct inode_smack *isp;
488 rc = cap_bprm_set_creds(bprm);
492 if (bprm->cred_prepared)
495 isp = inode->i_security;
496 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
502 bsp->smk_task = isp->smk_task;
503 bprm->per_clear |= PER_CLEAR_ON_SETID;
509 * smack_bprm_committing_creds - Prepare to install the new credentials
512 * @bprm: binprm for exec
514 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
516 struct task_smack *bsp = bprm->cred->security;
518 if (bsp->smk_task != bsp->smk_forked)
519 current->pdeath_signal = 0;
523 * smack_bprm_secureexec - Return the decision to use secureexec.
524 * @bprm: binprm for exec
526 * Returns 0 on success.
528 static int smack_bprm_secureexec(struct linux_binprm *bprm)
530 struct task_smack *tsp = current_security();
531 int ret = cap_bprm_secureexec(bprm);
533 if (!ret && (tsp->smk_task != tsp->smk_forked))
544 * smack_inode_alloc_security - allocate an inode blob
545 * @inode: the inode in need of a blob
547 * Returns 0 if it gets a blob, -ENOMEM otherwise
549 static int smack_inode_alloc_security(struct inode *inode)
551 struct smack_known *skp = smk_of_current();
553 inode->i_security = new_inode_smack(skp->smk_known);
554 if (inode->i_security == NULL)
560 * smack_inode_free_security - free an inode blob
561 * @inode: the inode with a blob
563 * Clears the blob pointer in inode
565 static void smack_inode_free_security(struct inode *inode)
567 kmem_cache_free(smack_inode_cache, inode->i_security);
568 inode->i_security = NULL;
572 * smack_inode_init_security - copy out the smack from an inode
576 * @name: where to put the attribute name
577 * @value: where to put the attribute value
578 * @len: where to put the length of the attribute
580 * Returns 0 if it all works out, -ENOMEM if there's no memory
582 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
583 const struct qstr *qstr, char **name,
584 void **value, size_t *len)
586 struct inode_smack *issp = inode->i_security;
587 struct smack_known *skp = smk_of_current();
588 char *isp = smk_of_inode(inode);
589 char *dsp = smk_of_inode(dir);
593 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
600 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
604 * If the access rule allows transmutation and
605 * the directory requests transmutation then
606 * by all means transmute.
607 * Mark the inode as changed.
609 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
610 smk_inode_transmutable(dir)) {
612 issp->smk_flags |= SMK_INODE_CHANGED;
615 *value = kstrdup(isp, GFP_KERNEL);
621 *len = strlen(isp) + 1;
627 * smack_inode_link - Smack check on link
628 * @old_dentry: the existing object
630 * @new_dentry: the new object
632 * Returns 0 if access is permitted, an error code otherwise
634 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
635 struct dentry *new_dentry)
638 struct smk_audit_info ad;
641 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
642 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
644 isp = smk_of_inode(old_dentry->d_inode);
645 rc = smk_curacc(isp, MAY_WRITE, &ad);
647 if (rc == 0 && new_dentry->d_inode != NULL) {
648 isp = smk_of_inode(new_dentry->d_inode);
649 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
650 rc = smk_curacc(isp, MAY_WRITE, &ad);
657 * smack_inode_unlink - Smack check on inode deletion
658 * @dir: containing directory object
659 * @dentry: file to unlink
661 * Returns 0 if current can write the containing directory
662 * and the object, error code otherwise
664 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
666 struct inode *ip = dentry->d_inode;
667 struct smk_audit_info ad;
670 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
671 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
674 * You need write access to the thing you're unlinking
676 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
679 * You also need write access to the containing directory
681 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
682 smk_ad_setfield_u_fs_inode(&ad, dir);
683 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
689 * smack_inode_rmdir - Smack check on directory deletion
690 * @dir: containing directory object
691 * @dentry: directory to unlink
693 * Returns 0 if current can write the containing directory
694 * and the directory, error code otherwise
696 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
698 struct smk_audit_info ad;
701 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
702 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
705 * You need write access to the thing you're removing
707 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
710 * You also need write access to the containing directory
712 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
713 smk_ad_setfield_u_fs_inode(&ad, dir);
714 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
721 * smack_inode_rename - Smack check on rename
722 * @old_inode: the old directory
723 * @old_dentry: unused
724 * @new_inode: the new directory
725 * @new_dentry: unused
727 * Read and write access is required on both the old and
730 * Returns 0 if access is permitted, an error code otherwise
732 static int smack_inode_rename(struct inode *old_inode,
733 struct dentry *old_dentry,
734 struct inode *new_inode,
735 struct dentry *new_dentry)
739 struct smk_audit_info ad;
741 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
742 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
744 isp = smk_of_inode(old_dentry->d_inode);
745 rc = smk_curacc(isp, MAY_READWRITE, &ad);
747 if (rc == 0 && new_dentry->d_inode != NULL) {
748 isp = smk_of_inode(new_dentry->d_inode);
749 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
750 rc = smk_curacc(isp, MAY_READWRITE, &ad);
756 * smack_inode_permission - Smack version of permission()
757 * @inode: the inode in question
758 * @mask: the access requested
759 * @flags: special case
761 * This is the important Smack hook.
763 * Returns 0 if access is permitted, -EACCES otherwise
765 static int smack_inode_permission(struct inode *inode, int mask, unsigned flags)
767 struct smk_audit_info ad;
769 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
771 * No permission to check. Existence test. Yup, it's there.
776 /* May be droppable after audit */
777 if (flags & IPERM_FLAG_RCU)
780 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
781 smk_ad_setfield_u_fs_inode(&ad, inode);
782 return smk_curacc(smk_of_inode(inode), mask, &ad);
786 * smack_inode_setattr - Smack check for setting attributes
787 * @dentry: the object
788 * @iattr: for the force flag
790 * Returns 0 if access is permitted, an error code otherwise
792 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
794 struct smk_audit_info ad;
796 * Need to allow for clearing the setuid bit.
798 if (iattr->ia_valid & ATTR_FORCE)
800 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
801 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
803 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
807 * smack_inode_getattr - Smack check for getting attributes
809 * @dentry: the object
811 * Returns 0 if access is permitted, an error code otherwise
813 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
815 struct smk_audit_info ad;
818 path.dentry = dentry;
821 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
822 smk_ad_setfield_u_fs_path(&ad, path);
823 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
827 * smack_inode_setxattr - Smack check for setting xattrs
828 * @dentry: the object
829 * @name: name of the attribute
834 * This protects the Smack attribute explicitly.
836 * Returns 0 if access is permitted, an error code otherwise
838 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
839 const void *value, size_t size, int flags)
841 struct smk_audit_info ad;
844 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
845 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
846 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
847 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
848 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
849 if (!smack_privileged(CAP_MAC_ADMIN))
852 * check label validity here so import wont fail on
855 if (size == 0 || size >= SMK_LONGLABEL ||
856 smk_import(value, size) == NULL)
858 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
859 if (!smack_privileged(CAP_MAC_ADMIN))
861 if (size != TRANS_TRUE_SIZE ||
862 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
865 rc = cap_inode_setxattr(dentry, name, value, size, flags);
867 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
868 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
871 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
877 * smack_inode_post_setxattr - Apply the Smack update approved above
879 * @name: attribute name
880 * @value: attribute value
881 * @size: attribute size
884 * Set the pointer in the inode blob to the entry found
885 * in the master label list.
887 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
888 const void *value, size_t size, int flags)
890 struct smack_known *skp;
891 struct inode_smack *isp = dentry->d_inode->i_security;
893 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
894 isp->smk_flags |= SMK_INODE_TRANSMUTE;
898 skp = smk_import_entry(value, size);
899 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
901 isp->smk_inode = skp->smk_known;
903 isp->smk_inode = smack_known_invalid.smk_known;
904 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
908 isp->smk_task = &smack_known_invalid;
909 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
913 isp->smk_mmap = &smack_known_invalid;
920 * smack_inode_getxattr - Smack check on getxattr
921 * @dentry: the object
924 * Returns 0 if access is permitted, an error code otherwise
926 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
928 struct smk_audit_info ad;
930 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
931 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
933 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
937 * smack_inode_removexattr - Smack check on removexattr
938 * @dentry: the object
939 * @name: name of the attribute
941 * Removing the Smack attribute requires CAP_MAC_ADMIN
943 * Returns 0 if access is permitted, an error code otherwise
945 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
947 struct inode_smack *isp;
948 struct smk_audit_info ad;
951 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
952 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
953 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
954 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
955 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
956 strcmp(name, XATTR_NAME_SMACKMMAP)) {
957 if (!smack_privileged(CAP_MAC_ADMIN))
960 rc = cap_inode_removexattr(dentry, name);
962 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
963 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
965 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
968 isp = dentry->d_inode->i_security;
969 isp->smk_task = NULL;
970 isp->smk_mmap = NULL;
977 * smack_inode_getsecurity - get smack xattrs
979 * @name: attribute name
980 * @buffer: where to put the result
983 * Returns the size of the attribute or an error code
985 static int smack_inode_getsecurity(const struct inode *inode,
986 const char *name, void **buffer,
989 struct socket_smack *ssp;
991 struct super_block *sbp;
992 struct inode *ip = (struct inode *)inode;
997 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
998 isp = smk_of_inode(inode);
999 ilen = strlen(isp) + 1;
1005 * The rest of the Smack xattrs are only on sockets.
1008 if (sbp->s_magic != SOCKFS_MAGIC)
1011 sock = SOCKET_I(ip);
1012 if (sock == NULL || sock->sk == NULL)
1015 ssp = sock->sk->sk_security;
1017 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1019 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1020 isp = ssp->smk_out->smk_known;
1024 ilen = strlen(isp) + 1;
1035 * smack_inode_listsecurity - list the Smack attributes
1036 * @inode: the object
1037 * @buffer: where they go
1038 * @buffer_size: size of buffer
1040 * Returns 0 on success, -EINVAL otherwise
1042 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1045 int len = strlen(XATTR_NAME_SMACK);
1047 if (buffer != NULL && len <= buffer_size) {
1048 memcpy(buffer, XATTR_NAME_SMACK, len);
1055 * smack_inode_getsecid - Extract inode's security id
1056 * @inode: inode to extract the info from
1057 * @secid: where result will be saved
1059 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1061 struct inode_smack *isp = inode->i_security;
1063 *secid = smack_to_secid(isp->smk_inode);
1071 * smack_file_permission - Smack check on file operations
1077 * Should access checks be done on each read or write?
1078 * UNICOS and SELinux say yes.
1079 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1081 * I'll say no for now. Smack does not do the frequent
1082 * label changing that SELinux does.
1084 static int smack_file_permission(struct file *file, int mask)
1090 * smack_file_alloc_security - assign a file security blob
1093 * The security blob for a file is a pointer to the master
1094 * label list, so no allocation is done.
1098 static int smack_file_alloc_security(struct file *file)
1100 struct smack_known *skp = smk_of_current();
1102 file->f_security = skp->smk_known;
1107 * smack_file_free_security - clear a file security blob
1110 * The security blob for a file is a pointer to the master
1111 * label list, so no memory is freed.
1113 static void smack_file_free_security(struct file *file)
1115 file->f_security = NULL;
1119 * smack_file_ioctl - Smack check on ioctls
1124 * Relies heavily on the correct use of the ioctl command conventions.
1126 * Returns 0 if allowed, error code otherwise
1128 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1132 struct smk_audit_info ad;
1134 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1135 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1137 if (_IOC_DIR(cmd) & _IOC_WRITE)
1138 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1140 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1141 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1147 * smack_file_lock - Smack check on file locking
1151 * Returns 0 if current has lock access, error code otherwise
1153 static int smack_file_lock(struct file *file, unsigned int cmd)
1155 struct smk_audit_info ad;
1157 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1158 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1159 return smk_curacc(file->f_security, MAY_LOCK, &ad);
1163 * smack_file_fcntl - Smack check on fcntl
1165 * @cmd: what action to check
1168 * Generally these operations are harmless.
1169 * File locking operations present an obvious mechanism
1170 * for passing information, so they require write access.
1172 * Returns 0 if current has access, error code otherwise
1174 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1177 struct smk_audit_info ad;
1186 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1187 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1188 rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
1192 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1193 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1194 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1205 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1206 * if mapping anonymous memory.
1207 * @file contains the file structure for file to map (may be NULL).
1208 * @reqprot contains the protection requested by the application.
1209 * @prot contains the protection that will be applied by the kernel.
1210 * @flags contains the operational flags.
1211 * Return 0 if permission is granted.
1213 static int smack_file_mmap(struct file *file,
1214 unsigned long reqprot, unsigned long prot,
1215 unsigned long flags, unsigned long addr,
1216 unsigned long addr_only)
1218 struct smack_known *skp;
1219 struct smack_known *mkp;
1220 struct smack_rule *srp;
1221 struct task_smack *tsp;
1223 struct inode_smack *isp;
1230 /* do DAC check on address space usage */
1231 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1232 if (rc || addr_only)
1235 if (file == NULL || file->f_dentry == NULL)
1238 dp = file->f_dentry;
1240 if (dp->d_inode == NULL)
1243 isp = dp->d_inode->i_security;
1244 if (isp->smk_mmap == NULL)
1246 mkp = isp->smk_mmap;
1248 tsp = current_security();
1249 skp = smk_of_current();
1254 * For each Smack rule associated with the subject
1255 * label verify that the SMACK64MMAP also has access
1256 * to that rule's object label.
1258 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1259 osmack = srp->smk_object;
1261 * Matching labels always allows access.
1263 if (mkp->smk_known == osmack)
1266 * If there is a matching local rule take
1267 * that into account as well.
1269 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
1272 may = srp->smk_access;
1274 may &= srp->smk_access;
1276 * If may is zero the SMACK64MMAP subject can't
1277 * possibly have less access.
1283 * Fetch the global list entry.
1284 * If there isn't one a SMACK64MMAP subject
1285 * can't have as much access as current.
1287 mmay = smk_access_entry(mkp->smk_known, osmack,
1289 if (mmay == -ENOENT) {
1294 * If there is a local entry it modifies the
1295 * potential access, too.
1297 tmay = smk_access_entry(mkp->smk_known, osmack,
1299 if (tmay != -ENOENT)
1303 * If there is any access available to current that is
1304 * not available to a SMACK64MMAP subject
1307 if ((may | mmay) != mmay) {
1319 * smack_file_set_fowner - set the file security blob value
1320 * @file: object in question
1323 * Further research may be required on this one.
1325 static int smack_file_set_fowner(struct file *file)
1327 struct smack_known *skp = smk_of_current();
1329 file->f_security = skp->smk_known;
1334 * smack_file_send_sigiotask - Smack on sigio
1335 * @tsk: The target task
1336 * @fown: the object the signal come from
1339 * Allow a privileged task to get signals even if it shouldn't
1341 * Returns 0 if a subject with the object's smack could
1342 * write to the task, an error code otherwise.
1344 static int smack_file_send_sigiotask(struct task_struct *tsk,
1345 struct fown_struct *fown, int signum)
1347 struct smack_known *skp;
1348 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1351 struct smk_audit_info ad;
1354 * struct fown_struct is never outside the context of a struct file
1356 file = container_of(fown, struct file, f_owner);
1358 /* we don't log here as rc can be overriden */
1359 skp = smk_find_entry(file->f_security);
1360 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
1361 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1364 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1365 smk_ad_setfield_u_tsk(&ad, tsk);
1366 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
1371 * smack_file_receive - Smack file receive check
1374 * Returns 0 if current has access, error code otherwise
1376 static int smack_file_receive(struct file *file)
1379 struct smk_audit_info ad;
1381 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1382 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1384 * This code relies on bitmasks.
1386 if (file->f_mode & FMODE_READ)
1388 if (file->f_mode & FMODE_WRITE)
1391 return smk_curacc(file->f_security, may, &ad);
1395 * smack_dentry_open - Smack dentry open processing
1399 * Set the security blob in the file structure.
1403 static int smack_dentry_open(struct file *file, const struct cred *cred)
1405 struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
1407 file->f_security = isp->smk_inode;
1417 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1418 * @new: the new credentials
1419 * @gfp: the atomicity of any memory allocations
1421 * Prepare a blank set of credentials for modification. This must allocate all
1422 * the memory the LSM module might require such that cred_transfer() can
1423 * complete without error.
1425 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1427 struct task_smack *tsp;
1429 tsp = new_task_smack(NULL, NULL, gfp);
1433 cred->security = tsp;
1440 * smack_cred_free - "free" task-level security credentials
1441 * @cred: the credentials in question
1444 static void smack_cred_free(struct cred *cred)
1446 struct task_smack *tsp = cred->security;
1447 struct smack_rule *rp;
1448 struct list_head *l;
1449 struct list_head *n;
1453 cred->security = NULL;
1455 list_for_each_safe(l, n, &tsp->smk_rules) {
1456 rp = list_entry(l, struct smack_rule, list);
1457 list_del(&rp->list);
1464 * smack_cred_prepare - prepare new set of credentials for modification
1465 * @new: the new credentials
1466 * @old: the original credentials
1467 * @gfp: the atomicity of any memory allocations
1469 * Prepare a new set of credentials for modification.
1471 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1474 struct task_smack *old_tsp = old->security;
1475 struct task_smack *new_tsp;
1478 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1479 if (new_tsp == NULL)
1482 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1486 new->security = new_tsp;
1491 * smack_cred_transfer - Transfer the old credentials to the new credentials
1492 * @new: the new credentials
1493 * @old: the original credentials
1495 * Fill in a set of blank credentials from another set of credentials.
1497 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1499 struct task_smack *old_tsp = old->security;
1500 struct task_smack *new_tsp = new->security;
1502 new_tsp->smk_task = old_tsp->smk_task;
1503 new_tsp->smk_forked = old_tsp->smk_task;
1504 mutex_init(&new_tsp->smk_rules_lock);
1505 INIT_LIST_HEAD(&new_tsp->smk_rules);
1508 /* cbs copy rule list */
1512 * smack_kernel_act_as - Set the subjective context in a set of credentials
1513 * @new: points to the set of credentials to be modified.
1514 * @secid: specifies the security ID to be set
1516 * Set the security data for a kernel service.
1518 static int smack_kernel_act_as(struct cred *new, u32 secid)
1520 struct task_smack *new_tsp = new->security;
1521 struct smack_known *skp = smack_from_secid(secid);
1526 new_tsp->smk_task = skp;
1531 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1532 * @new: points to the set of credentials to be modified
1533 * @inode: points to the inode to use as a reference
1535 * Set the file creation context in a set of credentials to the same
1536 * as the objective context of the specified inode
1538 static int smack_kernel_create_files_as(struct cred *new,
1539 struct inode *inode)
1541 struct inode_smack *isp = inode->i_security;
1542 struct task_smack *tsp = new->security;
1544 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1545 tsp->smk_task = tsp->smk_forked;
1550 * smk_curacc_on_task - helper to log task related access
1551 * @p: the task object
1552 * @access: the access requested
1553 * @caller: name of the calling function for audit
1555 * Return 0 if access is permitted
1557 static int smk_curacc_on_task(struct task_struct *p, int access,
1560 struct smk_audit_info ad;
1561 struct smack_known *skp = smk_of_task(task_security(p));
1563 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1564 smk_ad_setfield_u_tsk(&ad, p);
1565 return smk_curacc(skp->smk_known, access, &ad);
1569 * smack_task_setpgid - Smack check on setting pgid
1570 * @p: the task object
1573 * Return 0 if write access is permitted
1575 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1577 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1581 * smack_task_getpgid - Smack access check for getpgid
1582 * @p: the object task
1584 * Returns 0 if current can read the object task, error code otherwise
1586 static int smack_task_getpgid(struct task_struct *p)
1588 return smk_curacc_on_task(p, MAY_READ, __func__);
1592 * smack_task_getsid - Smack access check for getsid
1593 * @p: the object task
1595 * Returns 0 if current can read the object task, error code otherwise
1597 static int smack_task_getsid(struct task_struct *p)
1599 return smk_curacc_on_task(p, MAY_READ, __func__);
1603 * smack_task_getsecid - get the secid of the task
1604 * @p: the object task
1605 * @secid: where to put the result
1607 * Sets the secid to contain a u32 version of the smack label.
1609 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1611 struct smack_known *skp = smk_of_task(task_security(p));
1613 *secid = skp->smk_secid;
1617 * smack_task_setnice - Smack check on setting nice
1618 * @p: the task object
1621 * Return 0 if write access is permitted
1623 static int smack_task_setnice(struct task_struct *p, int nice)
1627 rc = cap_task_setnice(p, nice);
1629 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1634 * smack_task_setioprio - Smack check on setting ioprio
1635 * @p: the task object
1638 * Return 0 if write access is permitted
1640 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1644 rc = cap_task_setioprio(p, ioprio);
1646 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1651 * smack_task_getioprio - Smack check on reading ioprio
1652 * @p: the task object
1654 * Return 0 if read access is permitted
1656 static int smack_task_getioprio(struct task_struct *p)
1658 return smk_curacc_on_task(p, MAY_READ, __func__);
1662 * smack_task_setscheduler - Smack check on setting scheduler
1663 * @p: the task object
1667 * Return 0 if read access is permitted
1669 static int smack_task_setscheduler(struct task_struct *p)
1673 rc = cap_task_setscheduler(p);
1675 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1680 * smack_task_getscheduler - Smack check on reading scheduler
1681 * @p: the task object
1683 * Return 0 if read access is permitted
1685 static int smack_task_getscheduler(struct task_struct *p)
1687 return smk_curacc_on_task(p, MAY_READ, __func__);
1691 * smack_task_movememory - Smack check on moving memory
1692 * @p: the task object
1694 * Return 0 if write access is permitted
1696 static int smack_task_movememory(struct task_struct *p)
1698 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1702 * smack_task_kill - Smack check on signal delivery
1703 * @p: the task object
1706 * @secid: identifies the smack to use in lieu of current's
1708 * Return 0 if write access is permitted
1710 * The secid behavior is an artifact of an SELinux hack
1711 * in the USB code. Someday it may go away.
1713 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1716 struct smk_audit_info ad;
1717 struct smack_known *skp;
1718 struct smack_known *tkp = smk_of_task(task_security(p));
1720 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1721 smk_ad_setfield_u_tsk(&ad, p);
1723 * Sending a signal requires that the sender
1724 * can write the receiver.
1727 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
1729 * If the secid isn't 0 we're dealing with some USB IO
1730 * specific behavior. This is not clean. For one thing
1731 * we can't take privilege into account.
1733 skp = smack_from_secid(secid);
1734 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
1738 * smack_task_wait - Smack access check for waiting
1739 * @p: task to wait for
1743 static int smack_task_wait(struct task_struct *p)
1746 * Allow the operation to succeed.
1748 * In userless environments (e.g. phones) programs
1749 * get marked with SMACK64EXEC and even if the parent
1750 * and child shouldn't be talking the parent still
1751 * may expect to know when the child exits.
1757 * smack_task_to_inode - copy task smack into the inode blob
1758 * @p: task to copy from
1759 * @inode: inode to copy to
1761 * Sets the smack pointer in the inode security blob
1763 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1765 struct inode_smack *isp = inode->i_security;
1766 struct smack_known *skp = smk_of_task(task_security(p));
1768 isp->smk_inode = skp->smk_known;
1776 * smack_sk_alloc_security - Allocate a socket blob
1779 * @gfp_flags: memory allocation flags
1781 * Assign Smack pointers to current
1783 * Returns 0 on success, -ENOMEM is there's no memory
1785 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1787 struct smack_known *skp = smk_of_current();
1788 struct socket_smack *ssp;
1790 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1794 ssp->smk_in = skp->smk_known;
1796 ssp->smk_packet = NULL;
1798 sk->sk_security = ssp;
1804 * smack_sk_free_security - Free a socket blob
1807 * Clears the blob pointer
1809 static void smack_sk_free_security(struct sock *sk)
1811 kfree(sk->sk_security);
1815 * smack_host_label - check host based restrictions
1816 * @sip: the object end
1818 * looks for host based access restrictions
1820 * This version will only be appropriate for really small sets of single label
1821 * hosts. The caller is responsible for ensuring that the RCU read lock is
1822 * taken before calling this function.
1824 * Returns the label of the far end or NULL if it's not special.
1826 static char *smack_host_label(struct sockaddr_in *sip)
1828 struct smk_netlbladdr *snp;
1829 struct in_addr *siap = &sip->sin_addr;
1831 if (siap->s_addr == 0)
1834 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1836 * we break after finding the first match because
1837 * the list is sorted from longest to shortest mask
1838 * so we have found the most specific match
1840 if ((&snp->smk_host.sin_addr)->s_addr ==
1841 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1842 /* we have found the special CIPSO option */
1843 if (snp->smk_label == smack_cipso_option)
1845 return snp->smk_label;
1852 * smack_netlabel - Set the secattr on a socket
1854 * @labeled: socket label scheme
1856 * Convert the outbound smack value (smk_out) to a
1857 * secattr and attach it to the socket.
1859 * Returns 0 on success or an error code
1861 static int smack_netlabel(struct sock *sk, int labeled)
1863 struct smack_known *skp;
1864 struct socket_smack *ssp = sk->sk_security;
1868 * Usually the netlabel code will handle changing the
1869 * packet labeling based on the label.
1870 * The case of a single label host is different, because
1871 * a single label host should never get a labeled packet
1872 * even though the label is usually associated with a packet
1876 bh_lock_sock_nested(sk);
1878 if (ssp->smk_out == smack_net_ambient ||
1879 labeled == SMACK_UNLABELED_SOCKET)
1880 netlbl_sock_delattr(sk);
1883 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1893 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1895 * @sap: the destination address
1897 * Set the correct secattr for the given socket based on the destination
1898 * address and perform any outbound access checks needed.
1900 * Returns 0 on success or an error code.
1903 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1905 struct smack_known *skp;
1909 struct socket_smack *ssp = sk->sk_security;
1910 struct smk_audit_info ad;
1913 hostsp = smack_host_label(sap);
1914 if (hostsp != NULL) {
1915 sk_lbl = SMACK_UNLABELED_SOCKET;
1917 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
1918 ad.a.u.net.family = sap->sin_family;
1919 ad.a.u.net.dport = sap->sin_port;
1920 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
1923 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
1925 sk_lbl = SMACK_CIPSO_SOCKET;
1932 return smack_netlabel(sk, sk_lbl);
1936 * smk_ipv6_port_label - Smack port access table management
1940 * Create or update the port list entry
1942 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
1944 struct sock *sk = sock->sk;
1945 struct sockaddr_in6 *addr6;
1946 struct socket_smack *ssp = sock->sk->sk_security;
1947 struct smk_port_label *spp;
1948 unsigned short port = 0;
1950 if (address == NULL) {
1952 * This operation is changing the Smack information
1953 * on the bound socket. Take the changes to the port
1956 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1957 if (sk != spp->smk_sock)
1959 spp->smk_in = ssp->smk_in;
1960 spp->smk_out = ssp->smk_out;
1964 * A NULL address is only used for updating existing
1965 * bound entries. If there isn't one, it's OK.
1970 addr6 = (struct sockaddr_in6 *)address;
1971 port = ntohs(addr6->sin6_port);
1973 * This is a special case that is safely ignored.
1979 * Look for an existing port list entry.
1980 * This is an indication that a port is getting reused.
1982 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1983 if (spp->smk_port != port)
1985 spp->smk_port = port;
1987 spp->smk_in = ssp->smk_in;
1988 spp->smk_out = ssp->smk_out;
1993 * A new port entry is required.
1995 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
1999 spp->smk_port = port;
2001 spp->smk_in = ssp->smk_in;
2002 spp->smk_out = ssp->smk_out;
2004 list_add(&spp->list, &smk_ipv6_port_list);
2009 * smk_ipv6_port_check - check Smack port access
2013 * Create or update the port list entry
2015 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
2020 struct smk_port_label *spp;
2021 struct socket_smack *ssp = sk->sk_security;
2022 struct smack_known *skp;
2023 unsigned short port = 0;
2025 struct smk_audit_info ad;
2027 if (act == SMK_RECEIVING) {
2028 skp = smack_net_ambient;
2029 object = ssp->smk_in;
2032 object = smack_net_ambient->smk_known;
2036 * Get the IP address and port from the address.
2038 port = ntohs(address->sin6_port);
2039 bep = (__be16 *)(&address->sin6_addr);
2040 be32p = (__be32 *)(&address->sin6_addr);
2043 * It's remote, so port lookup does no good.
2045 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2049 * It's local so the send check has to have passed.
2051 if (act == SMK_RECEIVING) {
2052 skp = &smack_known_web;
2056 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2057 if (spp->smk_port != port)
2059 object = spp->smk_in;
2060 if (act == SMK_CONNECTING)
2061 ssp->smk_packet = spp->smk_out->smk_known;
2068 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2069 ad.a.u.net.family = sk->sk_family;
2070 ad.a.u.net.dport = port;
2071 if (act == SMK_RECEIVING)
2072 ad.a.u.net.v6info.saddr = address->sin6_addr;
2074 ad.a.u.net.v6info.daddr = address->sin6_addr;
2076 return smk_access(skp, object, MAY_WRITE, &ad);
2080 * smack_inode_setsecurity - set smack xattrs
2081 * @inode: the object
2082 * @name: attribute name
2083 * @value: attribute value
2084 * @size: size of the attribute
2087 * Sets the named attribute in the appropriate blob
2089 * Returns 0 on success, or an error code
2091 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2092 const void *value, size_t size, int flags)
2094 struct smack_known *skp;
2095 struct inode_smack *nsp = inode->i_security;
2096 struct socket_smack *ssp;
2097 struct socket *sock;
2100 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2103 skp = smk_import_entry(value, size);
2107 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2108 nsp->smk_inode = skp->smk_known;
2109 nsp->smk_flags |= SMK_INODE_INSTANT;
2113 * The rest of the Smack xattrs are only on sockets.
2115 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2118 sock = SOCKET_I(inode);
2119 if (sock == NULL || sock->sk == NULL)
2122 ssp = sock->sk->sk_security;
2124 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2125 ssp->smk_in = skp->smk_known;
2126 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2128 if (sock->sk->sk_family == PF_INET) {
2129 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2132 "Smack: \"%s\" netlbl error %d.\n",
2138 if (sock->sk->sk_family == PF_INET6)
2139 smk_ipv6_port_label(sock, NULL);
2145 * smack_socket_post_create - finish socket setup
2147 * @family: protocol family
2152 * Sets the netlabel information on the socket
2154 * Returns 0 on success, and error code otherwise
2156 static int smack_socket_post_create(struct socket *sock, int family,
2157 int type, int protocol, int kern)
2159 if (family != PF_INET || sock->sk == NULL)
2162 * Set the outbound netlbl.
2164 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2168 * smack_socket_bind - record port binding information.
2170 * @address: the port address
2171 * @addrlen: size of the address
2173 * Records the label bound to a port.
2177 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2180 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2181 smk_ipv6_port_label(sock, address);
2187 * smack_socket_connect - connect access check
2189 * @sap: the other end
2190 * @addrlen: size of sap
2192 * Verifies that a connection may be possible
2194 * Returns 0 on success, and error code otherwise
2196 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2201 if (sock->sk == NULL)
2204 switch (sock->sk->sk_family) {
2206 if (addrlen < sizeof(struct sockaddr_in))
2208 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2211 if (addrlen < sizeof(struct sockaddr_in6))
2213 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2221 * smack_flags_to_may - convert S_ to MAY_ values
2222 * @flags: the S_ value
2224 * Returns the equivalent MAY_ value
2226 static int smack_flags_to_may(int flags)
2230 if (flags & S_IRUGO)
2232 if (flags & S_IWUGO)
2234 if (flags & S_IXUGO)
2241 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2246 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2248 struct smack_known *skp = smk_of_current();
2250 msg->security = skp->smk_known;
2255 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2258 * Clears the blob pointer
2260 static void smack_msg_msg_free_security(struct msg_msg *msg)
2262 msg->security = NULL;
2266 * smack_of_shm - the smack pointer for the shm
2269 * Returns a pointer to the smack value
2271 static char *smack_of_shm(struct shmid_kernel *shp)
2273 return (char *)shp->shm_perm.security;
2277 * smack_shm_alloc_security - Set the security blob for shm
2282 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2284 struct kern_ipc_perm *isp = &shp->shm_perm;
2285 struct smack_known *skp = smk_of_current();
2287 isp->security = skp->smk_known;
2292 * smack_shm_free_security - Clear the security blob for shm
2295 * Clears the blob pointer
2297 static void smack_shm_free_security(struct shmid_kernel *shp)
2299 struct kern_ipc_perm *isp = &shp->shm_perm;
2301 isp->security = NULL;
2305 * smk_curacc_shm : check if current has access on shm
2307 * @access : access requested
2309 * Returns 0 if current has the requested access, error code otherwise
2311 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2313 char *ssp = smack_of_shm(shp);
2314 struct smk_audit_info ad;
2317 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2318 ad.a.u.ipc_id = shp->shm_perm.id;
2320 return smk_curacc(ssp, access, &ad);
2324 * smack_shm_associate - Smack access check for shm
2326 * @shmflg: access requested
2328 * Returns 0 if current has the requested access, error code otherwise
2330 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2334 may = smack_flags_to_may(shmflg);
2335 return smk_curacc_shm(shp, may);
2339 * smack_shm_shmctl - Smack access check for shm
2341 * @cmd: what it wants to do
2343 * Returns 0 if current has the requested access, error code otherwise
2345 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2358 may = MAY_READWRITE;
2363 * System level information.
2369 return smk_curacc_shm(shp, may);
2373 * smack_shm_shmat - Smack access for shmat
2376 * @shmflg: access requested
2378 * Returns 0 if current has the requested access, error code otherwise
2380 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2385 may = smack_flags_to_may(shmflg);
2386 return smk_curacc_shm(shp, may);
2390 * smack_of_sem - the smack pointer for the sem
2393 * Returns a pointer to the smack value
2395 static char *smack_of_sem(struct sem_array *sma)
2397 return (char *)sma->sem_perm.security;
2401 * smack_sem_alloc_security - Set the security blob for sem
2406 static int smack_sem_alloc_security(struct sem_array *sma)
2408 struct kern_ipc_perm *isp = &sma->sem_perm;
2409 struct smack_known *skp = smk_of_current();
2411 isp->security = skp->smk_known;
2416 * smack_sem_free_security - Clear the security blob for sem
2419 * Clears the blob pointer
2421 static void smack_sem_free_security(struct sem_array *sma)
2423 struct kern_ipc_perm *isp = &sma->sem_perm;
2425 isp->security = NULL;
2429 * smk_curacc_sem : check if current has access on sem
2431 * @access : access requested
2433 * Returns 0 if current has the requested access, error code otherwise
2435 static int smk_curacc_sem(struct sem_array *sma, int access)
2437 char *ssp = smack_of_sem(sma);
2438 struct smk_audit_info ad;
2441 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2442 ad.a.u.ipc_id = sma->sem_perm.id;
2444 return smk_curacc(ssp, access, &ad);
2448 * smack_sem_associate - Smack access check for sem
2450 * @semflg: access requested
2452 * Returns 0 if current has the requested access, error code otherwise
2454 static int smack_sem_associate(struct sem_array *sma, int semflg)
2458 may = smack_flags_to_may(semflg);
2459 return smk_curacc_sem(sma, may);
2463 * smack_sem_shmctl - Smack access check for sem
2465 * @cmd: what it wants to do
2467 * Returns 0 if current has the requested access, error code otherwise
2469 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2487 may = MAY_READWRITE;
2492 * System level information
2499 return smk_curacc_sem(sma, may);
2503 * smack_sem_semop - Smack checks of semaphore operations
2509 * Treated as read and write in all cases.
2511 * Returns 0 if access is allowed, error code otherwise
2513 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2514 unsigned nsops, int alter)
2516 return smk_curacc_sem(sma, MAY_READWRITE);
2520 * smack_msg_alloc_security - Set the security blob for msg
2525 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2527 struct kern_ipc_perm *kisp = &msq->q_perm;
2528 struct smack_known *skp = smk_of_current();
2530 kisp->security = skp->smk_known;
2535 * smack_msg_free_security - Clear the security blob for msg
2538 * Clears the blob pointer
2540 static void smack_msg_queue_free_security(struct msg_queue *msq)
2542 struct kern_ipc_perm *kisp = &msq->q_perm;
2544 kisp->security = NULL;
2548 * smack_of_msq - the smack pointer for the msq
2551 * Returns a pointer to the smack value
2553 static char *smack_of_msq(struct msg_queue *msq)
2555 return (char *)msq->q_perm.security;
2559 * smk_curacc_msq : helper to check if current has access on msq
2561 * @access : access requested
2563 * return 0 if current has access, error otherwise
2565 static int smk_curacc_msq(struct msg_queue *msq, int access)
2567 char *msp = smack_of_msq(msq);
2568 struct smk_audit_info ad;
2571 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2572 ad.a.u.ipc_id = msq->q_perm.id;
2574 return smk_curacc(msp, access, &ad);
2578 * smack_msg_queue_associate - Smack access check for msg_queue
2580 * @msqflg: access requested
2582 * Returns 0 if current has the requested access, error code otherwise
2584 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2588 may = smack_flags_to_may(msqflg);
2589 return smk_curacc_msq(msq, may);
2593 * smack_msg_queue_msgctl - Smack access check for msg_queue
2595 * @cmd: what it wants to do
2597 * Returns 0 if current has the requested access, error code otherwise
2599 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2610 may = MAY_READWRITE;
2615 * System level information
2622 return smk_curacc_msq(msq, may);
2626 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2629 * @msqflg: access requested
2631 * Returns 0 if current has the requested access, error code otherwise
2633 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2638 may = smack_flags_to_may(msqflg);
2639 return smk_curacc_msq(msq, may);
2643 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2650 * Returns 0 if current has read and write access, error code otherwise
2652 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2653 struct task_struct *target, long type, int mode)
2655 return smk_curacc_msq(msq, MAY_READWRITE);
2659 * smack_ipc_permission - Smack access for ipc_permission()
2660 * @ipp: the object permissions
2661 * @flag: access requested
2663 * Returns 0 if current has read and write access, error code otherwise
2665 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2667 char *isp = ipp->security;
2668 int may = smack_flags_to_may(flag);
2669 struct smk_audit_info ad;
2672 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2673 ad.a.u.ipc_id = ipp->id;
2675 return smk_curacc(isp, may, &ad);
2679 * smack_ipc_getsecid - Extract smack security id
2680 * @ipp: the object permissions
2681 * @secid: where result will be saved
2683 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2685 char *smack = ipp->security;
2687 *secid = smack_to_secid(smack);
2691 * smack_d_instantiate - Make sure the blob is correct on an inode
2692 * @opt_dentry: dentry where inode will be attached
2693 * @inode: the object
2695 * Set the inode's security blob if it hasn't been done already.
2697 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2699 struct super_block *sbp;
2700 struct superblock_smack *sbsp;
2701 struct inode_smack *isp;
2702 struct smack_known *skp;
2703 struct smack_known *ckp = smk_of_current();
2705 char trattr[TRANS_TRUE_SIZE];
2713 isp = inode->i_security;
2715 mutex_lock(&isp->smk_lock);
2717 * If the inode is already instantiated
2718 * take the quick way out
2720 if (isp->smk_flags & SMK_INODE_INSTANT)
2724 sbsp = sbp->s_security;
2726 * We're going to use the superblock default label
2727 * if there's no label on the file.
2729 final = sbsp->smk_default;
2732 * If this is the root inode the superblock
2733 * may be in the process of initialization.
2734 * If that is the case use the root value out
2735 * of the superblock.
2737 if (opt_dentry->d_parent == opt_dentry) {
2738 isp->smk_inode = sbsp->smk_root;
2739 isp->smk_flags |= SMK_INODE_INSTANT;
2744 * This is pretty hackish.
2745 * Casey says that we shouldn't have to do
2746 * file system specific code, but it does help
2747 * with keeping it simple.
2749 switch (sbp->s_magic) {
2752 * Casey says that it's a little embarrassing
2753 * that the smack file system doesn't do
2754 * extended attributes.
2756 final = smack_known_star.smk_known;
2760 * Casey says pipes are easy (?)
2762 final = smack_known_star.smk_known;
2764 case DEVPTS_SUPER_MAGIC:
2766 * devpts seems content with the label of the task.
2767 * Programs that change smack have to treat the
2770 final = ckp->smk_known;
2774 * Socket access is controlled by the socket
2775 * structures associated with the task involved.
2777 final = smack_known_star.smk_known;
2779 case PROC_SUPER_MAGIC:
2781 * Casey says procfs appears not to care.
2782 * The superblock default suffices.
2787 * Device labels should come from the filesystem,
2788 * but watch out, because they're volitile,
2789 * getting recreated on every reboot.
2791 final = smack_known_star.smk_known;
2795 * If a smack value has been set we want to use it,
2796 * but since tmpfs isn't giving us the opportunity
2797 * to set mount options simulate setting the
2798 * superblock default.
2802 * This isn't an understood special case.
2803 * Get the value from the xattr.
2807 * UNIX domain sockets use lower level socket data.
2809 if (S_ISSOCK(inode->i_mode)) {
2810 final = smack_known_star.smk_known;
2814 * No xattr support means, alas, no SMACK label.
2815 * Use the aforeapplied default.
2816 * It would be curious if the label of the task
2817 * does not match that assigned.
2819 if (inode->i_op->getxattr == NULL)
2822 * Get the dentry for xattr.
2824 dp = dget(opt_dentry);
2825 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2827 final = skp->smk_known;
2830 * Transmuting directory
2832 if (S_ISDIR(inode->i_mode)) {
2834 * If this is a new directory and the label was
2835 * transmuted when the inode was initialized
2836 * set the transmute attribute on the directory
2837 * and mark the inode.
2839 * If there is a transmute attribute on the
2840 * directory mark the inode.
2842 if (isp->smk_flags & SMK_INODE_CHANGED) {
2843 isp->smk_flags &= ~SMK_INODE_CHANGED;
2844 rc = inode->i_op->setxattr(dp,
2845 XATTR_NAME_SMACKTRANSMUTE,
2846 TRANS_TRUE, TRANS_TRUE_SIZE,
2849 rc = inode->i_op->getxattr(dp,
2850 XATTR_NAME_SMACKTRANSMUTE, trattr,
2852 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2853 TRANS_TRUE_SIZE) != 0)
2857 transflag = SMK_INODE_TRANSMUTE;
2859 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2860 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2867 isp->smk_inode = ckp->smk_known;
2869 isp->smk_inode = final;
2871 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2874 mutex_unlock(&isp->smk_lock);
2879 * smack_getprocattr - Smack process attribute access
2880 * @p: the object task
2881 * @name: the name of the attribute in /proc/.../attr
2882 * @value: where to put the result
2884 * Places a copy of the task Smack into value
2886 * Returns the length of the smack label or an error code
2888 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2890 struct smack_known *skp = smk_of_task(task_security(p));
2894 if (strcmp(name, "current") != 0)
2897 cp = kstrdup(skp->smk_known, GFP_KERNEL);
2907 * smack_setprocattr - Smack process attribute setting
2908 * @p: the object task
2909 * @name: the name of the attribute in /proc/.../attr
2910 * @value: the value to set
2911 * @size: the size of the value
2913 * Sets the Smack value of the task. Only setting self
2914 * is permitted and only with privilege
2916 * Returns the length of the smack label or an error code
2918 static int smack_setprocattr(struct task_struct *p, char *name,
2919 void *value, size_t size)
2921 struct task_smack *tsp;
2923 struct smack_known *skp;
2926 * Changing another process' Smack value is too dangerous
2927 * and supports no sane use case.
2932 if (!smack_privileged(CAP_MAC_ADMIN))
2935 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2938 if (strcmp(name, "current") != 0)
2941 skp = smk_import_entry(value, size);
2946 * No process is ever allowed the web ("@") label.
2948 if (skp == &smack_known_web)
2951 new = prepare_creds();
2955 tsp = new->security;
2956 tsp->smk_task = skp;
2963 * smack_unix_stream_connect - Smack access on UDS
2965 * @other: the other sock
2968 * Return 0 if a subject with the smack of sock could access
2969 * an object with the smack of other, otherwise an error code
2971 static int smack_unix_stream_connect(struct sock *sock,
2972 struct sock *other, struct sock *newsk)
2974 struct smack_known *skp;
2975 struct socket_smack *ssp = sock->sk_security;
2976 struct socket_smack *osp = other->sk_security;
2977 struct socket_smack *nsp = newsk->sk_security;
2978 struct smk_audit_info ad;
2981 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2982 smk_ad_setfield_u_net_sk(&ad, other);
2984 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
2986 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
2990 * Cross reference the peer labels for SO_PEERSEC.
2993 nsp->smk_packet = ssp->smk_out->smk_known;
2994 ssp->smk_packet = osp->smk_out->smk_known;
3001 * smack_unix_may_send - Smack access on UDS
3003 * @other: the other socket
3005 * Return 0 if a subject with the smack of sock could access
3006 * an object with the smack of other, otherwise an error code
3008 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3010 struct socket_smack *ssp = sock->sk->sk_security;
3011 struct socket_smack *osp = other->sk->sk_security;
3012 struct smack_known *skp;
3013 struct smk_audit_info ad;
3015 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3016 smk_ad_setfield_u_net_sk(&ad, other->sk);
3018 if (smack_privileged(CAP_MAC_OVERRIDE))
3022 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
3026 * smack_socket_sendmsg - Smack check based on destination host
3029 * @size: the size of the message
3031 * Return 0 if the current subject can write to the destination host.
3032 * For IPv4 this is only a question if the destination is a single label host.
3033 * For IPv6 this is a check against the label of the port.
3035 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3038 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3039 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3043 * Perfectly reasonable for this to be NULL
3048 switch (sip->sin_family) {
3050 rc = smack_netlabel_send(sock->sk, sip);
3053 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3060 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3061 * @sap: netlabel secattr
3062 * @ssp: socket security information
3064 * Returns a pointer to a Smack label entry found on the label list.
3066 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3067 struct socket_smack *ssp)
3069 struct smack_known *skp;
3074 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3076 * Looks like a CIPSO packet.
3077 * If there are flags but no level netlabel isn't
3078 * behaving the way we expect it to.
3080 * Look it up in the label table
3081 * Without guidance regarding the smack value
3082 * for the packet fall back on the network
3086 list_for_each_entry(skp, &smack_known_list, list) {
3087 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3090 * Compare the catsets. Use the netlbl APIs.
3092 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3093 if ((skp->smk_netlabel.flags &
3094 NETLBL_SECATTR_MLS_CAT) == 0)
3098 for (acat = -1, kcat = -1; acat == kcat; ) {
3099 acat = netlbl_secattr_catmap_walk(
3100 sap->attr.mls.cat, acat + 1);
3101 kcat = netlbl_secattr_catmap_walk(
3102 skp->smk_netlabel.attr.mls.cat,
3104 if (acat < 0 || kcat < 0)
3117 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
3118 return &smack_known_web;
3119 return &smack_known_star;
3121 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3123 * Looks like a fallback, which gives us a secid.
3125 skp = smack_from_secid(sap->attr.secid);
3127 * This has got to be a bug because it is
3128 * impossible to specify a fallback without
3129 * specifying the label, which will ensure
3130 * it has a secid, and the only way to get a
3131 * secid is from a fallback.
3133 BUG_ON(skp == NULL);
3137 * Without guidance regarding the smack value
3138 * for the packet fall back on the network
3141 return smack_net_ambient;
3144 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3148 int proto = -EINVAL;
3149 struct ipv6hdr _ipv6h;
3150 struct ipv6hdr *ip6;
3152 struct tcphdr _tcph, *th;
3153 struct udphdr _udph, *uh;
3154 struct dccp_hdr _dccph, *dh;
3158 offset = skb_network_offset(skb);
3159 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3162 sip->sin6_addr = ip6->saddr;
3164 nexthdr = ip6->nexthdr;
3165 offset += sizeof(_ipv6h);
3166 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3173 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3175 sip->sin6_port = th->source;
3178 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3180 sip->sin6_port = uh->source;
3183 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3185 sip->sin6_port = dh->dccph_sport;
3192 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3196 * Returns 0 if the packet should be delivered, an error code otherwise
3198 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3200 struct netlbl_lsm_secattr secattr;
3201 struct socket_smack *ssp = sk->sk_security;
3202 struct smack_known *skp;
3203 struct sockaddr_in6 sadd;
3205 struct smk_audit_info ad;
3206 switch (sk->sk_family) {
3209 * Translate what netlabel gave us.
3211 netlbl_secattr_init(&secattr);
3213 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3215 skp = smack_from_secattr(&secattr, ssp);
3217 skp = smack_net_ambient;
3219 netlbl_secattr_destroy(&secattr);
3222 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3223 ad.a.u.net.family = sk->sk_family;
3224 ad.a.u.net.netif = skb->skb_iif;
3225 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3228 * Receiving a packet requires that the other end
3229 * be able to write here. Read access is not required.
3230 * This is the simplist possible security model
3233 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3235 netlbl_skbuff_err(skb, rc, 0);
3238 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3239 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3240 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3249 * smack_socket_getpeersec_stream - pull in packet label
3251 * @optval: user's destination
3252 * @optlen: size thereof
3255 * returns zero on success, an error code otherwise
3257 static int smack_socket_getpeersec_stream(struct socket *sock,
3258 char __user *optval,
3259 int __user *optlen, unsigned len)
3261 struct socket_smack *ssp;
3266 ssp = sock->sk->sk_security;
3267 if (ssp->smk_packet != NULL) {
3268 rcp = ssp->smk_packet;
3269 slen = strlen(rcp) + 1;
3274 else if (copy_to_user(optval, rcp, slen) != 0)
3277 if (put_user(slen, optlen) != 0)
3285 * smack_socket_getpeersec_dgram - pull in packet label
3286 * @sock: the peer socket
3288 * @secid: pointer to where to put the secid of the packet
3290 * Sets the netlabel socket state on sk from parent
3292 static int smack_socket_getpeersec_dgram(struct socket *sock,
3293 struct sk_buff *skb, u32 *secid)
3296 struct netlbl_lsm_secattr secattr;
3297 struct socket_smack *ssp = NULL;
3298 struct smack_known *skp;
3299 int family = PF_UNSPEC;
3300 u32 s = 0; /* 0 is the invalid secid */
3304 if (skb->protocol == htons(ETH_P_IP))
3306 else if (skb->protocol == htons(ETH_P_IPV6))
3309 if (family == PF_UNSPEC && sock != NULL)
3310 family = sock->sk->sk_family;
3312 if (family == PF_UNIX) {
3313 ssp = sock->sk->sk_security;
3314 s = ssp->smk_out->smk_secid;
3315 } else if (family == PF_INET || family == PF_INET6) {
3317 * Translate what netlabel gave us.
3319 if (sock != NULL && sock->sk != NULL)
3320 ssp = sock->sk->sk_security;
3321 netlbl_secattr_init(&secattr);
3322 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3324 skp = smack_from_secattr(&secattr, ssp);
3327 netlbl_secattr_destroy(&secattr);
3336 * smack_sock_graft - Initialize a newly created socket with an existing sock
3338 * @parent: parent socket
3340 * Set the smk_{in,out} state of an existing sock based on the process that
3341 * is creating the new socket.
3343 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3345 struct socket_smack *ssp;
3346 struct smack_known *skp = smk_of_current();
3349 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3352 ssp = sk->sk_security;
3353 ssp->smk_in = skp->smk_known;
3355 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3359 * smack_inet_conn_request - Smack access check on connect
3360 * @sk: socket involved
3364 * Returns 0 if a task with the packet label could write to
3365 * the socket, otherwise an error code
3367 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3368 struct request_sock *req)
3370 u16 family = sk->sk_family;
3371 struct smack_known *skp;
3372 struct socket_smack *ssp = sk->sk_security;
3373 struct netlbl_lsm_secattr secattr;
3374 struct sockaddr_in addr;
3378 struct smk_audit_info ad;
3380 if (family == PF_INET6) {
3382 * Handle mapped IPv4 packets arriving
3383 * via IPv6 sockets. Don't set up netlabel
3384 * processing on IPv6.
3386 if (skb->protocol == htons(ETH_P_IP))
3392 netlbl_secattr_init(&secattr);
3393 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3395 skp = smack_from_secattr(&secattr, ssp);
3397 skp = &smack_known_huh;
3398 netlbl_secattr_destroy(&secattr);
3401 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3402 ad.a.u.net.family = family;
3403 ad.a.u.net.netif = skb->skb_iif;
3404 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3407 * Receiving a packet requires that the other end be able to write
3408 * here. Read access is not required.
3410 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3415 * Save the peer's label in the request_sock so we can later setup
3416 * smk_packet in the child socket so that SO_PEERCRED can report it.
3418 req->peer_secid = skp->smk_secid;
3421 * We need to decide if we want to label the incoming connection here
3422 * if we do we only need to label the request_sock and the stack will
3423 * propagate the wire-label to the sock when it is created.
3426 addr.sin_addr.s_addr = hdr->saddr;
3428 hsp = smack_host_label(&addr);
3432 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3434 netlbl_req_delattr(req);
3440 * smack_inet_csk_clone - Copy the connection information to the new socket
3441 * @sk: the new socket
3442 * @req: the connection's request_sock
3444 * Transfer the connection's peer label to the newly created socket.
3446 static void smack_inet_csk_clone(struct sock *sk,
3447 const struct request_sock *req)
3449 struct socket_smack *ssp = sk->sk_security;
3450 struct smack_known *skp;
3452 if (req->peer_secid != 0) {
3453 skp = smack_from_secid(req->peer_secid);
3454 ssp->smk_packet = skp->smk_known;
3456 ssp->smk_packet = NULL;
3460 * Key management security hooks
3462 * Casey has not tested key support very heavily.
3463 * The permission check is most likely too restrictive.
3464 * If you care about keys please have a look.
3469 * smack_key_alloc - Set the key security blob
3471 * @cred: the credentials to use
3474 * No allocation required
3478 static int smack_key_alloc(struct key *key, const struct cred *cred,
3479 unsigned long flags)
3481 struct smack_known *skp = smk_of_task(cred->security);
3483 key->security = skp->smk_known;
3488 * smack_key_free - Clear the key security blob
3491 * Clear the blob pointer
3493 static void smack_key_free(struct key *key)
3495 key->security = NULL;
3499 * smack_key_permission - Smack access on a key
3500 * @key_ref: gets to the object
3501 * @cred: the credentials to use
3504 * Return 0 if the task has read and write to the object,
3505 * an error code otherwise
3507 static int smack_key_permission(key_ref_t key_ref,
3508 const struct cred *cred, key_perm_t perm)
3511 struct smk_audit_info ad;
3512 struct smack_known *tkp = smk_of_task(cred->security);
3514 keyp = key_ref_to_ptr(key_ref);
3518 * If the key hasn't been initialized give it access so that
3521 if (keyp->security == NULL)
3524 * This should not occur
3529 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3530 ad.a.u.key_struct.key = keyp->serial;
3531 ad.a.u.key_struct.key_desc = keyp->description;
3533 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
3535 #endif /* CONFIG_KEYS */
3540 * Audit requires a unique representation of each Smack specific
3541 * rule. This unique representation is used to distinguish the
3542 * object to be audited from remaining kernel objects and also
3543 * works as a glue between the audit hooks.
3545 * Since repository entries are added but never deleted, we'll use
3546 * the smack_known label address related to the given audit rule as
3547 * the needed unique representation. This also better fits the smack
3548 * model where nearly everything is a label.
3553 * smack_audit_rule_init - Initialize a smack audit rule
3554 * @field: audit rule fields given from user-space (audit.h)
3555 * @op: required testing operator (=, !=, >, <, ...)
3556 * @rulestr: smack label to be audited
3557 * @vrule: pointer to save our own audit rule representation
3559 * Prepare to audit cases where (@field @op @rulestr) is true.
3560 * The label to be audited is created if necessay.
3562 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3564 char **rule = (char **)vrule;
3567 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3570 if (op != Audit_equal && op != Audit_not_equal)
3573 *rule = smk_import(rulestr, 0);
3579 * smack_audit_rule_known - Distinguish Smack audit rules
3580 * @krule: rule of interest, in Audit kernel representation format
3582 * This is used to filter Smack rules from remaining Audit ones.
3583 * If it's proved that this rule belongs to us, the
3584 * audit_rule_match hook will be called to do the final judgement.
3586 static int smack_audit_rule_known(struct audit_krule *krule)
3588 struct audit_field *f;
3591 for (i = 0; i < krule->field_count; i++) {
3592 f = &krule->fields[i];
3594 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3602 * smack_audit_rule_match - Audit given object ?
3603 * @secid: security id for identifying the object to test
3604 * @field: audit rule flags given from user-space
3605 * @op: required testing operator
3606 * @vrule: smack internal rule presentation
3607 * @actx: audit context associated with the check
3609 * The core Audit hook. It's used to take the decision of
3610 * whether to audit or not to audit a given object.
3612 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3613 struct audit_context *actx)
3615 struct smack_known *skp;
3619 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
3620 "Smack: missing rule\n");
3624 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3627 skp = smack_from_secid(secid);
3630 * No need to do string comparisons. If a match occurs,
3631 * both pointers will point to the same smack_known
3634 if (op == Audit_equal)
3635 return (rule == skp->smk_known);
3636 if (op == Audit_not_equal)
3637 return (rule != skp->smk_known);
3643 * smack_audit_rule_free - free smack rule representation
3644 * @vrule: rule to be freed.
3646 * No memory was allocated.
3648 static void smack_audit_rule_free(void *vrule)
3653 #endif /* CONFIG_AUDIT */
3656 * smack_secid_to_secctx - return the smack label for a secid
3657 * @secid: incoming integer
3658 * @secdata: destination
3659 * @seclen: how long it is
3661 * Exists for networking code.
3663 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3665 struct smack_known *skp = smack_from_secid(secid);
3668 *secdata = skp->smk_known;
3669 *seclen = strlen(skp->smk_known);
3674 * smack_secctx_to_secid - return the secid for a smack label
3675 * @secdata: smack label
3676 * @seclen: how long result is
3677 * @secid: outgoing integer
3679 * Exists for audit and networking code.
3681 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3683 *secid = smack_to_secid(secdata);
3688 * smack_release_secctx - don't do anything.
3692 * Exists to make sure nothing gets done, and properly
3694 static void smack_release_secctx(char *secdata, u32 seclen)
3698 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3700 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3703 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3705 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3708 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3711 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3719 struct security_operations smack_ops = {
3722 .ptrace_access_check = smack_ptrace_access_check,
3723 .ptrace_traceme = smack_ptrace_traceme,
3724 .syslog = smack_syslog,
3726 .sb_alloc_security = smack_sb_alloc_security,
3727 .sb_free_security = smack_sb_free_security,
3728 .sb_copy_data = smack_sb_copy_data,
3729 .sb_kern_mount = smack_sb_kern_mount,
3730 .sb_statfs = smack_sb_statfs,
3731 .sb_mount = smack_sb_mount,
3732 .sb_umount = smack_sb_umount,
3734 .bprm_set_creds = smack_bprm_set_creds,
3735 .bprm_committing_creds = smack_bprm_committing_creds,
3736 .bprm_secureexec = smack_bprm_secureexec,
3738 .inode_alloc_security = smack_inode_alloc_security,
3739 .inode_free_security = smack_inode_free_security,
3740 .inode_init_security = smack_inode_init_security,
3741 .inode_link = smack_inode_link,
3742 .inode_unlink = smack_inode_unlink,
3743 .inode_rmdir = smack_inode_rmdir,
3744 .inode_rename = smack_inode_rename,
3745 .inode_permission = smack_inode_permission,
3746 .inode_setattr = smack_inode_setattr,
3747 .inode_getattr = smack_inode_getattr,
3748 .inode_setxattr = smack_inode_setxattr,
3749 .inode_post_setxattr = smack_inode_post_setxattr,
3750 .inode_getxattr = smack_inode_getxattr,
3751 .inode_removexattr = smack_inode_removexattr,
3752 .inode_getsecurity = smack_inode_getsecurity,
3753 .inode_setsecurity = smack_inode_setsecurity,
3754 .inode_listsecurity = smack_inode_listsecurity,
3755 .inode_getsecid = smack_inode_getsecid,
3757 .file_permission = smack_file_permission,
3758 .file_alloc_security = smack_file_alloc_security,
3759 .file_free_security = smack_file_free_security,
3760 .file_ioctl = smack_file_ioctl,
3761 .file_lock = smack_file_lock,
3762 .file_fcntl = smack_file_fcntl,
3763 .file_mmap = smack_file_mmap,
3764 .file_set_fowner = smack_file_set_fowner,
3765 .file_send_sigiotask = smack_file_send_sigiotask,
3766 .file_receive = smack_file_receive,
3768 .dentry_open = smack_dentry_open,
3770 .cred_alloc_blank = smack_cred_alloc_blank,
3771 .cred_free = smack_cred_free,
3772 .cred_prepare = smack_cred_prepare,
3773 .cred_transfer = smack_cred_transfer,
3774 .kernel_act_as = smack_kernel_act_as,
3775 .kernel_create_files_as = smack_kernel_create_files_as,
3776 .task_setpgid = smack_task_setpgid,
3777 .task_getpgid = smack_task_getpgid,
3778 .task_getsid = smack_task_getsid,
3779 .task_getsecid = smack_task_getsecid,
3780 .task_setnice = smack_task_setnice,
3781 .task_setioprio = smack_task_setioprio,
3782 .task_getioprio = smack_task_getioprio,
3783 .task_setscheduler = smack_task_setscheduler,
3784 .task_getscheduler = smack_task_getscheduler,
3785 .task_movememory = smack_task_movememory,
3786 .task_kill = smack_task_kill,
3787 .task_wait = smack_task_wait,
3788 .task_to_inode = smack_task_to_inode,
3790 .ipc_permission = smack_ipc_permission,
3791 .ipc_getsecid = smack_ipc_getsecid,
3793 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3794 .msg_msg_free_security = smack_msg_msg_free_security,
3796 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3797 .msg_queue_free_security = smack_msg_queue_free_security,
3798 .msg_queue_associate = smack_msg_queue_associate,
3799 .msg_queue_msgctl = smack_msg_queue_msgctl,
3800 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3801 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3803 .shm_alloc_security = smack_shm_alloc_security,
3804 .shm_free_security = smack_shm_free_security,
3805 .shm_associate = smack_shm_associate,
3806 .shm_shmctl = smack_shm_shmctl,
3807 .shm_shmat = smack_shm_shmat,
3809 .sem_alloc_security = smack_sem_alloc_security,
3810 .sem_free_security = smack_sem_free_security,
3811 .sem_associate = smack_sem_associate,
3812 .sem_semctl = smack_sem_semctl,
3813 .sem_semop = smack_sem_semop,
3815 .d_instantiate = smack_d_instantiate,
3817 .getprocattr = smack_getprocattr,
3818 .setprocattr = smack_setprocattr,
3820 .unix_stream_connect = smack_unix_stream_connect,
3821 .unix_may_send = smack_unix_may_send,
3823 .socket_post_create = smack_socket_post_create,
3824 .socket_bind = smack_socket_bind,
3825 .socket_connect = smack_socket_connect,
3826 .socket_sendmsg = smack_socket_sendmsg,
3827 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3828 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3829 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3830 .sk_alloc_security = smack_sk_alloc_security,
3831 .sk_free_security = smack_sk_free_security,
3832 .sock_graft = smack_sock_graft,
3833 .inet_conn_request = smack_inet_conn_request,
3834 .inet_csk_clone = smack_inet_csk_clone,
3836 /* key management security hooks */
3838 .key_alloc = smack_key_alloc,
3839 .key_free = smack_key_free,
3840 .key_permission = smack_key_permission,
3841 #endif /* CONFIG_KEYS */
3845 .audit_rule_init = smack_audit_rule_init,
3846 .audit_rule_known = smack_audit_rule_known,
3847 .audit_rule_match = smack_audit_rule_match,
3848 .audit_rule_free = smack_audit_rule_free,
3849 #endif /* CONFIG_AUDIT */
3851 .secid_to_secctx = smack_secid_to_secctx,
3852 .secctx_to_secid = smack_secctx_to_secid,
3853 .release_secctx = smack_release_secctx,
3854 .inode_notifysecctx = smack_inode_notifysecctx,
3855 .inode_setsecctx = smack_inode_setsecctx,
3856 .inode_getsecctx = smack_inode_getsecctx,
3860 static __init void init_smack_known_list(void)
3863 * Initialize rule list locks
3865 mutex_init(&smack_known_huh.smk_rules_lock);
3866 mutex_init(&smack_known_hat.smk_rules_lock);
3867 mutex_init(&smack_known_floor.smk_rules_lock);
3868 mutex_init(&smack_known_star.smk_rules_lock);
3869 mutex_init(&smack_known_invalid.smk_rules_lock);
3870 mutex_init(&smack_known_web.smk_rules_lock);
3872 * Initialize rule lists
3874 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3875 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3876 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3877 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3878 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3879 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3881 * Create the known labels list
3883 smk_insert_entry(&smack_known_huh);
3884 smk_insert_entry(&smack_known_hat);
3885 smk_insert_entry(&smack_known_star);
3886 smk_insert_entry(&smack_known_floor);
3887 smk_insert_entry(&smack_known_invalid);
3888 smk_insert_entry(&smack_known_web);
3891 /* KMEM caches for fast and thrifty allocations */
3892 struct kmem_cache *smack_rule_cache;
3893 struct kmem_cache *smack_master_list_cache;
3896 * smack_init - initialize the smack system
3900 static __init int smack_init(void)
3903 struct task_smack *tsp;
3905 if (!security_module_enable(&smack_ops))
3908 smack_rule_cache = KMEM_CACHE(smack_rule, 0);
3909 if (!smack_rule_cache)
3912 smack_master_list_cache = KMEM_CACHE(smack_master_list, 0);
3913 if (!smack_master_list_cache) {
3914 kmem_cache_destroy(smack_rule_cache);
3918 smack_inode_cache = KMEM_CACHE(inode_smack, 0);
3919 if (!smack_inode_cache) {
3920 kmem_cache_destroy(smack_master_list_cache);
3921 kmem_cache_destroy(smack_rule_cache);
3925 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
3928 kmem_cache_destroy(smack_master_list_cache);
3929 kmem_cache_destroy(smack_rule_cache);
3930 kmem_cache_destroy(smack_inode_cache);
3934 printk(KERN_INFO "Smack: Initializing.\n");
3937 * Set the security state for the initial task.
3939 cred = (struct cred *) current->cred;
3940 cred->security = tsp;
3942 /* initialize the smack_known_list */
3943 init_smack_known_list();
3948 if (register_security(&smack_ops))
3949 panic("smack: Unable to register with kernel.\n");
3954 #ifdef CONFIG_SECURITY_SMACK_PERMISSIVE_MODE
3955 static int __init mode_setup(char *str)
3958 if (!kstrtoul(str, 10, &mode))
3959 permissive_mode = mode ? 1 : 0;
3962 __setup("permissive=", mode_setup);
3966 * Smack requires early initialization in order to label
3967 * all processes and objects when they are created.
3969 security_initcall(smack_init);