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 (smack_privileged(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;
255 sb->s_security = sbsp;
261 * smack_sb_free_security - free a superblock blob
262 * @sb: the superblock getting the blob
265 static void smack_sb_free_security(struct super_block *sb)
267 kfree(sb->s_security);
268 sb->s_security = NULL;
272 * smack_sb_copy_data - copy mount options data for processing
273 * @orig: where to start
274 * @smackopts: mount options string
276 * Returns 0 on success or -ENOMEM on error.
278 * Copy the Smack specific mount options out of the mount
281 static int smack_sb_copy_data(char *orig, char *smackopts)
283 char *cp, *commap, *otheropts, *dp;
285 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
286 if (otheropts == NULL)
289 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
290 if (strstr(cp, SMK_FSDEFAULT) == cp)
292 else if (strstr(cp, SMK_FSFLOOR) == cp)
294 else if (strstr(cp, SMK_FSHAT) == cp)
296 else if (strstr(cp, SMK_FSROOT) == cp)
301 commap = strchr(cp, ',');
310 strcpy(orig, otheropts);
311 free_page((unsigned long)otheropts);
317 * smack_sb_kern_mount - Smack specific mount processing
318 * @sb: the file system superblock
319 * @flags: the mount flags
320 * @data: the smack mount options
322 * Returns 0 on success, an error code on failure
324 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
326 struct dentry *root = sb->s_root;
327 struct inode *inode = root->d_inode;
328 struct superblock_smack *sp = sb->s_security;
329 struct inode_smack *isp;
334 if (sp->smk_initialized != 0)
337 sp->smk_initialized = 1;
339 for (op = data; op != NULL; op = commap) {
340 commap = strchr(op, ',');
344 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
345 op += strlen(SMK_FSHAT);
346 nsp = smk_import(op, 0);
349 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
350 op += strlen(SMK_FSFLOOR);
351 nsp = smk_import(op, 0);
354 } else if (strncmp(op, SMK_FSDEFAULT,
355 strlen(SMK_FSDEFAULT)) == 0) {
356 op += strlen(SMK_FSDEFAULT);
357 nsp = smk_import(op, 0);
359 sp->smk_default = nsp;
360 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
361 op += strlen(SMK_FSROOT);
362 nsp = smk_import(op, 0);
369 * Initialize the root inode.
371 isp = inode->i_security;
373 inode->i_security = new_inode_smack(sp->smk_root);
375 isp->smk_inode = sp->smk_root;
381 * smack_sb_statfs - Smack check on statfs
382 * @dentry: identifies the file system in question
384 * Returns 0 if current can read the floor of the filesystem,
385 * and error code otherwise
387 static int smack_sb_statfs(struct dentry *dentry)
389 struct superblock_smack *sbp = dentry->d_sb->s_security;
391 struct smk_audit_info ad;
393 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
394 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
396 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
401 * smack_sb_mount - Smack check for mounting
408 * Returns 0 if current can write the floor of the filesystem
409 * being mounted on, an error code otherwise.
411 static int smack_sb_mount(char *dev_name, struct path *path,
412 char *type, unsigned long flags, void *data)
414 struct superblock_smack *sbp = path->dentry->d_sb->s_security;
415 struct smk_audit_info ad;
417 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
418 smk_ad_setfield_u_fs_path(&ad, *path);
420 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
424 * smack_sb_umount - Smack check for unmounting
425 * @mnt: file system to unmount
428 * Returns 0 if current can write the floor of the filesystem
429 * being unmounted, an error code otherwise.
431 static int smack_sb_umount(struct vfsmount *mnt, int flags)
433 struct superblock_smack *sbp;
434 struct smk_audit_info ad;
437 path.dentry = mnt->mnt_root;
440 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
441 smk_ad_setfield_u_fs_path(&ad, path);
443 sbp = path.dentry->d_sb->s_security;
444 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
452 * smack_bprm_set_creds - set creds for exec
453 * @bprm: the exec information
455 * Returns 0 if it gets a blob, -ENOMEM otherwise
457 static int smack_bprm_set_creds(struct linux_binprm *bprm)
459 struct inode *inode = bprm->file->f_path.dentry->d_inode;
460 struct task_smack *bsp = bprm->cred->security;
461 struct inode_smack *isp;
464 rc = cap_bprm_set_creds(bprm);
468 if (bprm->cred_prepared)
471 isp = inode->i_security;
472 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
478 bsp->smk_task = isp->smk_task;
479 bprm->per_clear |= PER_CLEAR_ON_SETID;
485 * smack_bprm_committing_creds - Prepare to install the new credentials
488 * @bprm: binprm for exec
490 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
492 struct task_smack *bsp = bprm->cred->security;
494 if (bsp->smk_task != bsp->smk_forked)
495 current->pdeath_signal = 0;
499 * smack_bprm_secureexec - Return the decision to use secureexec.
500 * @bprm: binprm for exec
502 * Returns 0 on success.
504 static int smack_bprm_secureexec(struct linux_binprm *bprm)
506 struct task_smack *tsp = current_security();
507 int ret = cap_bprm_secureexec(bprm);
509 if (!ret && (tsp->smk_task != tsp->smk_forked))
520 * smack_inode_alloc_security - allocate an inode blob
521 * @inode: the inode in need of a blob
523 * Returns 0 if it gets a blob, -ENOMEM otherwise
525 static int smack_inode_alloc_security(struct inode *inode)
527 inode->i_security = new_inode_smack(smk_of_current());
528 if (inode->i_security == NULL)
534 * smack_inode_free_security - free an inode blob
535 * @inode: the inode with a blob
537 * Clears the blob pointer in inode
539 static void smack_inode_free_security(struct inode *inode)
541 kfree(inode->i_security);
542 inode->i_security = NULL;
546 * smack_inode_init_security - copy out the smack from an inode
550 * @name: where to put the attribute name
551 * @value: where to put the attribute value
552 * @len: where to put the length of the attribute
554 * Returns 0 if it all works out, -ENOMEM if there's no memory
556 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
557 const struct qstr *qstr, char **name,
558 void **value, size_t *len)
560 struct smack_known *skp;
561 struct inode_smack *issp = inode->i_security;
562 char *csp = smk_of_current();
563 char *isp = smk_of_inode(inode);
564 char *dsp = smk_of_inode(dir);
568 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
574 skp = smk_find_entry(csp);
576 may = smk_access_entry(csp, dsp, &skp->smk_rules);
580 * If the access rule allows transmutation and
581 * the directory requests transmutation then
582 * by all means transmute.
583 * Mark the inode as changed.
585 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
586 smk_inode_transmutable(dir)) {
588 issp->smk_flags |= SMK_INODE_CHANGED;
591 *value = kstrdup(isp, GFP_NOFS);
597 *len = strlen(isp) + 1;
603 * smack_inode_link - Smack check on link
604 * @old_dentry: the existing object
606 * @new_dentry: the new object
608 * Returns 0 if access is permitted, an error code otherwise
610 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
611 struct dentry *new_dentry)
614 struct smk_audit_info ad;
617 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
618 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
620 isp = smk_of_inode(old_dentry->d_inode);
621 rc = smk_curacc(isp, MAY_WRITE, &ad);
623 if (rc == 0 && new_dentry->d_inode != NULL) {
624 isp = smk_of_inode(new_dentry->d_inode);
625 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
626 rc = smk_curacc(isp, MAY_WRITE, &ad);
633 * smack_inode_unlink - Smack check on inode deletion
634 * @dir: containing directory object
635 * @dentry: file to unlink
637 * Returns 0 if current can write the containing directory
638 * and the object, error code otherwise
640 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
642 struct inode *ip = dentry->d_inode;
643 struct smk_audit_info ad;
646 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
647 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
650 * You need write access to the thing you're unlinking
652 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
655 * You also need write access to the containing directory
657 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
658 smk_ad_setfield_u_fs_inode(&ad, dir);
659 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
665 * smack_inode_rmdir - Smack check on directory deletion
666 * @dir: containing directory object
667 * @dentry: directory to unlink
669 * Returns 0 if current can write the containing directory
670 * and the directory, error code otherwise
672 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
674 struct smk_audit_info ad;
677 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
678 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
681 * You need write access to the thing you're removing
683 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
686 * You also need write access to the containing directory
688 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
689 smk_ad_setfield_u_fs_inode(&ad, dir);
690 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
697 * smack_inode_rename - Smack check on rename
698 * @old_inode: the old directory
699 * @old_dentry: unused
700 * @new_inode: the new directory
701 * @new_dentry: unused
703 * Read and write access is required on both the old and
706 * Returns 0 if access is permitted, an error code otherwise
708 static int smack_inode_rename(struct inode *old_inode,
709 struct dentry *old_dentry,
710 struct inode *new_inode,
711 struct dentry *new_dentry)
715 struct smk_audit_info ad;
717 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
718 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
720 isp = smk_of_inode(old_dentry->d_inode);
721 rc = smk_curacc(isp, MAY_READWRITE, &ad);
723 if (rc == 0 && new_dentry->d_inode != NULL) {
724 isp = smk_of_inode(new_dentry->d_inode);
725 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
726 rc = smk_curacc(isp, MAY_READWRITE, &ad);
732 * smack_inode_permission - Smack version of permission()
733 * @inode: the inode in question
734 * @mask: the access requested
736 * This is the important Smack hook.
738 * Returns 0 if access is permitted, -EACCES otherwise
740 static int smack_inode_permission(struct inode *inode, int mask)
742 struct smk_audit_info ad;
743 int no_block = mask & MAY_NOT_BLOCK;
745 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
747 * No permission to check. Existence test. Yup, it's there.
752 /* May be droppable after audit */
755 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
756 smk_ad_setfield_u_fs_inode(&ad, inode);
757 return smk_curacc(smk_of_inode(inode), mask, &ad);
761 * smack_inode_setattr - Smack check for setting attributes
762 * @dentry: the object
763 * @iattr: for the force flag
765 * Returns 0 if access is permitted, an error code otherwise
767 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
769 struct smk_audit_info ad;
771 * Need to allow for clearing the setuid bit.
773 if (iattr->ia_valid & ATTR_FORCE)
775 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
776 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
778 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
782 * smack_inode_getattr - Smack check for getting attributes
784 * @dentry: the object
786 * Returns 0 if access is permitted, an error code otherwise
788 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
790 struct smk_audit_info ad;
793 path.dentry = dentry;
796 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
797 smk_ad_setfield_u_fs_path(&ad, path);
798 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
802 * smack_inode_setxattr - Smack check for setting xattrs
803 * @dentry: the object
804 * @name: name of the attribute
809 * This protects the Smack attribute explicitly.
811 * Returns 0 if access is permitted, an error code otherwise
813 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
814 const void *value, size_t size, int flags)
816 struct smk_audit_info ad;
819 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
820 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
821 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
822 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
823 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
824 if (!smack_privileged(CAP_MAC_ADMIN))
827 * check label validity here so import wont fail on
830 if (size == 0 || size >= SMK_LONGLABEL ||
831 smk_import(value, size) == NULL)
833 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
834 if (!smack_privileged(CAP_MAC_ADMIN))
836 if (size != TRANS_TRUE_SIZE ||
837 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
840 rc = cap_inode_setxattr(dentry, name, value, size, flags);
842 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
843 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
846 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
852 * smack_inode_post_setxattr - Apply the Smack update approved above
854 * @name: attribute name
855 * @value: attribute value
856 * @size: attribute size
859 * Set the pointer in the inode blob to the entry found
860 * in the master label list.
862 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
863 const void *value, size_t size, int flags)
866 struct inode_smack *isp = dentry->d_inode->i_security;
868 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
869 nsp = smk_import(value, size);
871 isp->smk_inode = nsp;
873 isp->smk_inode = smack_known_invalid.smk_known;
874 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
875 nsp = smk_import(value, size);
879 isp->smk_task = smack_known_invalid.smk_known;
880 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
881 nsp = smk_import(value, size);
885 isp->smk_mmap = smack_known_invalid.smk_known;
886 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
887 isp->smk_flags |= SMK_INODE_TRANSMUTE;
893 * smack_inode_getxattr - Smack check on getxattr
894 * @dentry: the object
897 * Returns 0 if access is permitted, an error code otherwise
899 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
901 struct smk_audit_info ad;
903 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
904 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
906 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
910 * smack_inode_removexattr - Smack check on removexattr
911 * @dentry: the object
912 * @name: name of the attribute
914 * Removing the Smack attribute requires CAP_MAC_ADMIN
916 * Returns 0 if access is permitted, an error code otherwise
918 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
920 struct inode_smack *isp;
921 struct smk_audit_info ad;
924 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
925 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
926 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
927 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
928 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
929 strcmp(name, XATTR_NAME_SMACKMMAP)) {
930 if (!smack_privileged(CAP_MAC_ADMIN))
933 rc = cap_inode_removexattr(dentry, name);
935 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
936 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
938 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
941 isp = dentry->d_inode->i_security;
942 isp->smk_task = NULL;
943 isp->smk_mmap = NULL;
950 * smack_inode_getsecurity - get smack xattrs
952 * @name: attribute name
953 * @buffer: where to put the result
956 * Returns the size of the attribute or an error code
958 static int smack_inode_getsecurity(const struct inode *inode,
959 const char *name, void **buffer,
962 struct socket_smack *ssp;
964 struct super_block *sbp;
965 struct inode *ip = (struct inode *)inode;
970 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
971 isp = smk_of_inode(inode);
972 ilen = strlen(isp) + 1;
978 * The rest of the Smack xattrs are only on sockets.
981 if (sbp->s_magic != SOCKFS_MAGIC)
985 if (sock == NULL || sock->sk == NULL)
988 ssp = sock->sk->sk_security;
990 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
992 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
997 ilen = strlen(isp) + 1;
1008 * smack_inode_listsecurity - list the Smack attributes
1009 * @inode: the object
1010 * @buffer: where they go
1011 * @buffer_size: size of buffer
1013 * Returns 0 on success, -EINVAL otherwise
1015 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1018 int len = strlen(XATTR_NAME_SMACK);
1020 if (buffer != NULL && len <= buffer_size) {
1021 memcpy(buffer, XATTR_NAME_SMACK, len);
1028 * smack_inode_getsecid - Extract inode's security id
1029 * @inode: inode to extract the info from
1030 * @secid: where result will be saved
1032 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1034 struct inode_smack *isp = inode->i_security;
1036 *secid = smack_to_secid(isp->smk_inode);
1044 * smack_file_permission - Smack check on file operations
1050 * Should access checks be done on each read or write?
1051 * UNICOS and SELinux say yes.
1052 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1054 * I'll say no for now. Smack does not do the frequent
1055 * label changing that SELinux does.
1057 static int smack_file_permission(struct file *file, int mask)
1063 * smack_file_alloc_security - assign a file security blob
1066 * The security blob for a file is a pointer to the master
1067 * label list, so no allocation is done.
1071 static int smack_file_alloc_security(struct file *file)
1073 file->f_security = smk_of_current();
1078 * smack_file_free_security - clear a file security blob
1081 * The security blob for a file is a pointer to the master
1082 * label list, so no memory is freed.
1084 static void smack_file_free_security(struct file *file)
1086 file->f_security = NULL;
1090 * smack_file_ioctl - Smack check on ioctls
1095 * Relies heavily on the correct use of the ioctl command conventions.
1097 * Returns 0 if allowed, error code otherwise
1099 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1103 struct smk_audit_info ad;
1105 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1106 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1108 if (_IOC_DIR(cmd) & _IOC_WRITE)
1109 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1111 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1112 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1118 * smack_file_lock - Smack check on file locking
1122 * Returns 0 if current has write access, error code otherwise
1124 static int smack_file_lock(struct file *file, unsigned int cmd)
1126 struct smk_audit_info ad;
1128 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1129 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1130 return smk_curacc(file->f_security, MAY_WRITE, &ad);
1134 * smack_file_fcntl - Smack check on fcntl
1136 * @cmd: what action to check
1139 * Generally these operations are harmless.
1140 * File locking operations present an obvious mechanism
1141 * for passing information, so they require write access.
1143 * Returns 0 if current has access, error code otherwise
1145 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1148 struct smk_audit_info ad;
1158 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1159 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1160 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1171 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1172 * if mapping anonymous memory.
1173 * @file contains the file structure for file to map (may be NULL).
1174 * @reqprot contains the protection requested by the application.
1175 * @prot contains the protection that will be applied by the kernel.
1176 * @flags contains the operational flags.
1177 * Return 0 if permission is granted.
1179 static int smack_mmap_file(struct file *file,
1180 unsigned long reqprot, unsigned long prot,
1181 unsigned long flags)
1183 struct smack_known *skp;
1184 struct smack_rule *srp;
1185 struct task_smack *tsp;
1189 struct inode_smack *isp;
1196 if (file == NULL || file->f_dentry == NULL)
1199 dp = file->f_dentry;
1201 if (dp->d_inode == NULL)
1204 isp = dp->d_inode->i_security;
1205 if (isp->smk_mmap == NULL)
1207 msmack = isp->smk_mmap;
1209 tsp = current_security();
1210 sp = smk_of_current();
1211 skp = smk_find_entry(sp);
1216 * For each Smack rule associated with the subject
1217 * label verify that the SMACK64MMAP also has access
1218 * to that rule's object label.
1220 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1221 osmack = srp->smk_object;
1223 * Matching labels always allows access.
1225 if (msmack == osmack)
1228 * If there is a matching local rule take
1229 * that into account as well.
1231 may = smk_access_entry(srp->smk_subject, osmack,
1234 may = srp->smk_access;
1236 may &= srp->smk_access;
1238 * If may is zero the SMACK64MMAP subject can't
1239 * possibly have less access.
1245 * Fetch the global list entry.
1246 * If there isn't one a SMACK64MMAP subject
1247 * can't have as much access as current.
1249 skp = smk_find_entry(msmack);
1250 mmay = smk_access_entry(msmack, osmack, &skp->smk_rules);
1251 if (mmay == -ENOENT) {
1256 * If there is a local entry it modifies the
1257 * potential access, too.
1259 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1260 if (tmay != -ENOENT)
1264 * If there is any access available to current that is
1265 * not available to a SMACK64MMAP subject
1268 if ((may | mmay) != mmay) {
1280 * smack_file_set_fowner - set the file security blob value
1281 * @file: object in question
1284 * Further research may be required on this one.
1286 static int smack_file_set_fowner(struct file *file)
1288 file->f_security = smk_of_current();
1293 * smack_file_send_sigiotask - Smack on sigio
1294 * @tsk: The target task
1295 * @fown: the object the signal come from
1298 * Allow a privileged task to get signals even if it shouldn't
1300 * Returns 0 if a subject with the object's smack could
1301 * write to the task, an error code otherwise.
1303 static int smack_file_send_sigiotask(struct task_struct *tsk,
1304 struct fown_struct *fown, int signum)
1308 char *tsp = smk_of_task(tsk->cred->security);
1309 struct smk_audit_info ad;
1312 * struct fown_struct is never outside the context of a struct file
1314 file = container_of(fown, struct file, f_owner);
1316 /* we don't log here as rc can be overriden */
1317 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1318 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1321 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1322 smk_ad_setfield_u_tsk(&ad, tsk);
1323 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1328 * smack_file_receive - Smack file receive check
1331 * Returns 0 if current has access, error code otherwise
1333 static int smack_file_receive(struct file *file)
1336 struct smk_audit_info ad;
1338 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1339 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1341 * This code relies on bitmasks.
1343 if (file->f_mode & FMODE_READ)
1345 if (file->f_mode & FMODE_WRITE)
1348 return smk_curacc(file->f_security, may, &ad);
1352 * smack_file_open - Smack dentry open processing
1356 * Set the security blob in the file structure.
1360 static int smack_file_open(struct file *file, const struct cred *cred)
1362 struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
1364 file->f_security = isp->smk_inode;
1374 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1375 * @new: the new credentials
1376 * @gfp: the atomicity of any memory allocations
1378 * Prepare a blank set of credentials for modification. This must allocate all
1379 * the memory the LSM module might require such that cred_transfer() can
1380 * complete without error.
1382 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1384 struct task_smack *tsp;
1386 tsp = new_task_smack(NULL, NULL, gfp);
1390 cred->security = tsp;
1397 * smack_cred_free - "free" task-level security credentials
1398 * @cred: the credentials in question
1401 static void smack_cred_free(struct cred *cred)
1403 struct task_smack *tsp = cred->security;
1404 struct smack_rule *rp;
1405 struct list_head *l;
1406 struct list_head *n;
1410 cred->security = NULL;
1412 list_for_each_safe(l, n, &tsp->smk_rules) {
1413 rp = list_entry(l, struct smack_rule, list);
1414 list_del(&rp->list);
1421 * smack_cred_prepare - prepare new set of credentials for modification
1422 * @new: the new credentials
1423 * @old: the original credentials
1424 * @gfp: the atomicity of any memory allocations
1426 * Prepare a new set of credentials for modification.
1428 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1431 struct task_smack *old_tsp = old->security;
1432 struct task_smack *new_tsp;
1435 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1436 if (new_tsp == NULL)
1439 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1443 new->security = new_tsp;
1448 * smack_cred_transfer - Transfer the old credentials to the new credentials
1449 * @new: the new credentials
1450 * @old: the original credentials
1452 * Fill in a set of blank credentials from another set of credentials.
1454 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1456 struct task_smack *old_tsp = old->security;
1457 struct task_smack *new_tsp = new->security;
1459 new_tsp->smk_task = old_tsp->smk_task;
1460 new_tsp->smk_forked = old_tsp->smk_task;
1461 mutex_init(&new_tsp->smk_rules_lock);
1462 INIT_LIST_HEAD(&new_tsp->smk_rules);
1465 /* cbs copy rule list */
1469 * smack_kernel_act_as - Set the subjective context in a set of credentials
1470 * @new: points to the set of credentials to be modified.
1471 * @secid: specifies the security ID to be set
1473 * Set the security data for a kernel service.
1475 static int smack_kernel_act_as(struct cred *new, u32 secid)
1477 struct task_smack *new_tsp = new->security;
1478 char *smack = smack_from_secid(secid);
1483 new_tsp->smk_task = smack;
1488 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1489 * @new: points to the set of credentials to be modified
1490 * @inode: points to the inode to use as a reference
1492 * Set the file creation context in a set of credentials to the same
1493 * as the objective context of the specified inode
1495 static int smack_kernel_create_files_as(struct cred *new,
1496 struct inode *inode)
1498 struct inode_smack *isp = inode->i_security;
1499 struct task_smack *tsp = new->security;
1501 tsp->smk_forked = isp->smk_inode;
1502 tsp->smk_task = isp->smk_inode;
1507 * smk_curacc_on_task - helper to log task related access
1508 * @p: the task object
1509 * @access: the access requested
1510 * @caller: name of the calling function for audit
1512 * Return 0 if access is permitted
1514 static int smk_curacc_on_task(struct task_struct *p, int access,
1517 struct smk_audit_info ad;
1519 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1520 smk_ad_setfield_u_tsk(&ad, p);
1521 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1525 * smack_task_setpgid - Smack check on setting pgid
1526 * @p: the task object
1529 * Return 0 if write access is permitted
1531 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1533 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1537 * smack_task_getpgid - Smack access check for getpgid
1538 * @p: the object task
1540 * Returns 0 if current can read the object task, error code otherwise
1542 static int smack_task_getpgid(struct task_struct *p)
1544 return smk_curacc_on_task(p, MAY_READ, __func__);
1548 * smack_task_getsid - Smack access check for getsid
1549 * @p: the object task
1551 * Returns 0 if current can read the object task, error code otherwise
1553 static int smack_task_getsid(struct task_struct *p)
1555 return smk_curacc_on_task(p, MAY_READ, __func__);
1559 * smack_task_getsecid - get the secid of the task
1560 * @p: the object task
1561 * @secid: where to put the result
1563 * Sets the secid to contain a u32 version of the smack label.
1565 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1567 *secid = smack_to_secid(smk_of_task(task_security(p)));
1571 * smack_task_setnice - Smack check on setting nice
1572 * @p: the task object
1575 * Return 0 if write access is permitted
1577 static int smack_task_setnice(struct task_struct *p, int nice)
1581 rc = cap_task_setnice(p, nice);
1583 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1588 * smack_task_setioprio - Smack check on setting ioprio
1589 * @p: the task object
1592 * Return 0 if write access is permitted
1594 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1598 rc = cap_task_setioprio(p, ioprio);
1600 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1605 * smack_task_getioprio - Smack check on reading ioprio
1606 * @p: the task object
1608 * Return 0 if read access is permitted
1610 static int smack_task_getioprio(struct task_struct *p)
1612 return smk_curacc_on_task(p, MAY_READ, __func__);
1616 * smack_task_setscheduler - Smack check on setting scheduler
1617 * @p: the task object
1621 * Return 0 if read access is permitted
1623 static int smack_task_setscheduler(struct task_struct *p)
1627 rc = cap_task_setscheduler(p);
1629 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1634 * smack_task_getscheduler - Smack check on reading scheduler
1635 * @p: the task object
1637 * Return 0 if read access is permitted
1639 static int smack_task_getscheduler(struct task_struct *p)
1641 return smk_curacc_on_task(p, MAY_READ, __func__);
1645 * smack_task_movememory - Smack check on moving memory
1646 * @p: the task object
1648 * Return 0 if write access is permitted
1650 static int smack_task_movememory(struct task_struct *p)
1652 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1656 * smack_task_kill - Smack check on signal delivery
1657 * @p: the task object
1660 * @secid: identifies the smack to use in lieu of current's
1662 * Return 0 if write access is permitted
1664 * The secid behavior is an artifact of an SELinux hack
1665 * in the USB code. Someday it may go away.
1667 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1670 struct smk_audit_info ad;
1672 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1673 smk_ad_setfield_u_tsk(&ad, p);
1675 * Sending a signal requires that the sender
1676 * can write the receiver.
1679 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1682 * If the secid isn't 0 we're dealing with some USB IO
1683 * specific behavior. This is not clean. For one thing
1684 * we can't take privilege into account.
1686 return smk_access(smack_from_secid(secid),
1687 smk_of_task(task_security(p)), MAY_WRITE, &ad);
1691 * smack_task_wait - Smack access check for waiting
1692 * @p: task to wait for
1694 * Returns 0 if current can wait for p, error code otherwise
1696 static int smack_task_wait(struct task_struct *p)
1698 struct smk_audit_info ad;
1699 char *sp = smk_of_current();
1700 char *tsp = smk_of_forked(task_security(p));
1703 /* we don't log here, we can be overriden */
1704 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
1709 * Allow the operation to succeed if either task
1710 * has privilege to perform operations that might
1711 * account for the smack labels having gotten to
1712 * be different in the first place.
1714 * This breaks the strict subject/object access
1715 * control ideal, taking the object's privilege
1716 * state into account in the decision as well as
1719 if (smack_privileged(CAP_MAC_OVERRIDE) ||
1720 has_capability(p, CAP_MAC_OVERRIDE))
1722 /* we log only if we didn't get overriden */
1724 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1725 smk_ad_setfield_u_tsk(&ad, p);
1726 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
1731 * smack_task_to_inode - copy task smack into the inode blob
1732 * @p: task to copy from
1733 * @inode: inode to copy to
1735 * Sets the smack pointer in the inode security blob
1737 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1739 struct inode_smack *isp = inode->i_security;
1740 isp->smk_inode = smk_of_task(task_security(p));
1748 * smack_sk_alloc_security - Allocate a socket blob
1751 * @gfp_flags: memory allocation flags
1753 * Assign Smack pointers to current
1755 * Returns 0 on success, -ENOMEM is there's no memory
1757 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1759 char *csp = smk_of_current();
1760 struct socket_smack *ssp;
1762 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1768 ssp->smk_packet = NULL;
1770 sk->sk_security = ssp;
1776 * smack_sk_free_security - Free a socket blob
1779 * Clears the blob pointer
1781 static void smack_sk_free_security(struct sock *sk)
1783 kfree(sk->sk_security);
1787 * smack_host_label - check host based restrictions
1788 * @sip: the object end
1790 * looks for host based access restrictions
1792 * This version will only be appropriate for really small sets of single label
1793 * hosts. The caller is responsible for ensuring that the RCU read lock is
1794 * taken before calling this function.
1796 * Returns the label of the far end or NULL if it's not special.
1798 static char *smack_host_label(struct sockaddr_in *sip)
1800 struct smk_netlbladdr *snp;
1801 struct in_addr *siap = &sip->sin_addr;
1803 if (siap->s_addr == 0)
1806 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1808 * we break after finding the first match because
1809 * the list is sorted from longest to shortest mask
1810 * so we have found the most specific match
1812 if ((&snp->smk_host.sin_addr)->s_addr ==
1813 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1814 /* we have found the special CIPSO option */
1815 if (snp->smk_label == smack_cipso_option)
1817 return snp->smk_label;
1824 * smack_netlabel - Set the secattr on a socket
1826 * @labeled: socket label scheme
1828 * Convert the outbound smack value (smk_out) to a
1829 * secattr and attach it to the socket.
1831 * Returns 0 on success or an error code
1833 static int smack_netlabel(struct sock *sk, int labeled)
1835 struct smack_known *skp;
1836 struct socket_smack *ssp = sk->sk_security;
1840 * Usually the netlabel code will handle changing the
1841 * packet labeling based on the label.
1842 * The case of a single label host is different, because
1843 * a single label host should never get a labeled packet
1844 * even though the label is usually associated with a packet
1848 bh_lock_sock_nested(sk);
1850 if (ssp->smk_out == smack_net_ambient ||
1851 labeled == SMACK_UNLABELED_SOCKET)
1852 netlbl_sock_delattr(sk);
1854 skp = smk_find_entry(ssp->smk_out);
1855 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1865 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1867 * @sap: the destination address
1869 * Set the correct secattr for the given socket based on the destination
1870 * address and perform any outbound access checks needed.
1872 * Returns 0 on success or an error code.
1875 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1880 struct socket_smack *ssp = sk->sk_security;
1881 struct smk_audit_info ad;
1884 hostsp = smack_host_label(sap);
1885 if (hostsp != NULL) {
1887 struct lsm_network_audit net;
1889 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1890 ad.a.u.net->family = sap->sin_family;
1891 ad.a.u.net->dport = sap->sin_port;
1892 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
1894 sk_lbl = SMACK_UNLABELED_SOCKET;
1895 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1897 sk_lbl = SMACK_CIPSO_SOCKET;
1904 return smack_netlabel(sk, sk_lbl);
1908 * smack_inode_setsecurity - set smack xattrs
1909 * @inode: the object
1910 * @name: attribute name
1911 * @value: attribute value
1912 * @size: size of the attribute
1915 * Sets the named attribute in the appropriate blob
1917 * Returns 0 on success, or an error code
1919 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1920 const void *value, size_t size, int flags)
1923 struct inode_smack *nsp = inode->i_security;
1924 struct socket_smack *ssp;
1925 struct socket *sock;
1928 if (value == NULL || size > SMK_LONGLABEL || size == 0)
1931 sp = smk_import(value, size);
1935 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1936 nsp->smk_inode = sp;
1937 nsp->smk_flags |= SMK_INODE_INSTANT;
1941 * The rest of the Smack xattrs are only on sockets.
1943 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1946 sock = SOCKET_I(inode);
1947 if (sock == NULL || sock->sk == NULL)
1950 ssp = sock->sk->sk_security;
1952 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1954 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1956 if (sock->sk->sk_family != PF_UNIX) {
1957 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1960 "Smack: \"%s\" netlbl error %d.\n",
1970 * smack_socket_post_create - finish socket setup
1972 * @family: protocol family
1977 * Sets the netlabel information on the socket
1979 * Returns 0 on success, and error code otherwise
1981 static int smack_socket_post_create(struct socket *sock, int family,
1982 int type, int protocol, int kern)
1984 if (family != PF_INET || sock->sk == NULL)
1987 * Set the outbound netlbl.
1989 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1993 * smack_socket_connect - connect access check
1995 * @sap: the other end
1996 * @addrlen: size of sap
1998 * Verifies that a connection may be possible
2000 * Returns 0 on success, and error code otherwise
2002 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2005 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
2007 if (addrlen < sizeof(struct sockaddr_in))
2010 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2014 * smack_flags_to_may - convert S_ to MAY_ values
2015 * @flags: the S_ value
2017 * Returns the equivalent MAY_ value
2019 static int smack_flags_to_may(int flags)
2023 if (flags & S_IRUGO)
2025 if (flags & S_IWUGO)
2027 if (flags & S_IXUGO)
2034 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2039 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2041 msg->security = smk_of_current();
2046 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2049 * Clears the blob pointer
2051 static void smack_msg_msg_free_security(struct msg_msg *msg)
2053 msg->security = NULL;
2057 * smack_of_shm - the smack pointer for the shm
2060 * Returns a pointer to the smack value
2062 static char *smack_of_shm(struct shmid_kernel *shp)
2064 return (char *)shp->shm_perm.security;
2068 * smack_shm_alloc_security - Set the security blob for shm
2073 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2075 struct kern_ipc_perm *isp = &shp->shm_perm;
2077 isp->security = smk_of_current();
2082 * smack_shm_free_security - Clear the security blob for shm
2085 * Clears the blob pointer
2087 static void smack_shm_free_security(struct shmid_kernel *shp)
2089 struct kern_ipc_perm *isp = &shp->shm_perm;
2091 isp->security = NULL;
2095 * smk_curacc_shm : check if current has access on shm
2097 * @access : access requested
2099 * Returns 0 if current has the requested access, error code otherwise
2101 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2103 char *ssp = smack_of_shm(shp);
2104 struct smk_audit_info ad;
2107 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2108 ad.a.u.ipc_id = shp->shm_perm.id;
2110 return smk_curacc(ssp, access, &ad);
2114 * smack_shm_associate - Smack access check for shm
2116 * @shmflg: access requested
2118 * Returns 0 if current has the requested access, error code otherwise
2120 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2124 may = smack_flags_to_may(shmflg);
2125 return smk_curacc_shm(shp, may);
2129 * smack_shm_shmctl - Smack access check for shm
2131 * @cmd: what it wants to do
2133 * Returns 0 if current has the requested access, error code otherwise
2135 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2148 may = MAY_READWRITE;
2153 * System level information.
2159 return smk_curacc_shm(shp, may);
2163 * smack_shm_shmat - Smack access for shmat
2166 * @shmflg: access requested
2168 * Returns 0 if current has the requested access, error code otherwise
2170 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2175 may = smack_flags_to_may(shmflg);
2176 return smk_curacc_shm(shp, may);
2180 * smack_of_sem - the smack pointer for the sem
2183 * Returns a pointer to the smack value
2185 static char *smack_of_sem(struct sem_array *sma)
2187 return (char *)sma->sem_perm.security;
2191 * smack_sem_alloc_security - Set the security blob for sem
2196 static int smack_sem_alloc_security(struct sem_array *sma)
2198 struct kern_ipc_perm *isp = &sma->sem_perm;
2200 isp->security = smk_of_current();
2205 * smack_sem_free_security - Clear the security blob for sem
2208 * Clears the blob pointer
2210 static void smack_sem_free_security(struct sem_array *sma)
2212 struct kern_ipc_perm *isp = &sma->sem_perm;
2214 isp->security = NULL;
2218 * smk_curacc_sem : check if current has access on sem
2220 * @access : access requested
2222 * Returns 0 if current has the requested access, error code otherwise
2224 static int smk_curacc_sem(struct sem_array *sma, int access)
2226 char *ssp = smack_of_sem(sma);
2227 struct smk_audit_info ad;
2230 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2231 ad.a.u.ipc_id = sma->sem_perm.id;
2233 return smk_curacc(ssp, access, &ad);
2237 * smack_sem_associate - Smack access check for sem
2239 * @semflg: access requested
2241 * Returns 0 if current has the requested access, error code otherwise
2243 static int smack_sem_associate(struct sem_array *sma, int semflg)
2247 may = smack_flags_to_may(semflg);
2248 return smk_curacc_sem(sma, may);
2252 * smack_sem_shmctl - Smack access check for sem
2254 * @cmd: what it wants to do
2256 * Returns 0 if current has the requested access, error code otherwise
2258 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2276 may = MAY_READWRITE;
2281 * System level information
2288 return smk_curacc_sem(sma, may);
2292 * smack_sem_semop - Smack checks of semaphore operations
2298 * Treated as read and write in all cases.
2300 * Returns 0 if access is allowed, error code otherwise
2302 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2303 unsigned nsops, int alter)
2305 return smk_curacc_sem(sma, MAY_READWRITE);
2309 * smack_msg_alloc_security - Set the security blob for msg
2314 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2316 struct kern_ipc_perm *kisp = &msq->q_perm;
2318 kisp->security = smk_of_current();
2323 * smack_msg_free_security - Clear the security blob for msg
2326 * Clears the blob pointer
2328 static void smack_msg_queue_free_security(struct msg_queue *msq)
2330 struct kern_ipc_perm *kisp = &msq->q_perm;
2332 kisp->security = NULL;
2336 * smack_of_msq - the smack pointer for the msq
2339 * Returns a pointer to the smack value
2341 static char *smack_of_msq(struct msg_queue *msq)
2343 return (char *)msq->q_perm.security;
2347 * smk_curacc_msq : helper to check if current has access on msq
2349 * @access : access requested
2351 * return 0 if current has access, error otherwise
2353 static int smk_curacc_msq(struct msg_queue *msq, int access)
2355 char *msp = smack_of_msq(msq);
2356 struct smk_audit_info ad;
2359 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2360 ad.a.u.ipc_id = msq->q_perm.id;
2362 return smk_curacc(msp, access, &ad);
2366 * smack_msg_queue_associate - Smack access check for msg_queue
2368 * @msqflg: access requested
2370 * Returns 0 if current has the requested access, error code otherwise
2372 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2376 may = smack_flags_to_may(msqflg);
2377 return smk_curacc_msq(msq, may);
2381 * smack_msg_queue_msgctl - Smack access check for msg_queue
2383 * @cmd: what it wants to do
2385 * Returns 0 if current has the requested access, error code otherwise
2387 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2398 may = MAY_READWRITE;
2403 * System level information
2410 return smk_curacc_msq(msq, may);
2414 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2417 * @msqflg: access requested
2419 * Returns 0 if current has the requested access, error code otherwise
2421 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2426 may = smack_flags_to_may(msqflg);
2427 return smk_curacc_msq(msq, may);
2431 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2438 * Returns 0 if current has read and write access, error code otherwise
2440 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2441 struct task_struct *target, long type, int mode)
2443 return smk_curacc_msq(msq, MAY_READWRITE);
2447 * smack_ipc_permission - Smack access for ipc_permission()
2448 * @ipp: the object permissions
2449 * @flag: access requested
2451 * Returns 0 if current has read and write access, error code otherwise
2453 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2455 char *isp = ipp->security;
2456 int may = smack_flags_to_may(flag);
2457 struct smk_audit_info ad;
2460 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2461 ad.a.u.ipc_id = ipp->id;
2463 return smk_curacc(isp, may, &ad);
2467 * smack_ipc_getsecid - Extract smack security id
2468 * @ipp: the object permissions
2469 * @secid: where result will be saved
2471 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2473 char *smack = ipp->security;
2475 *secid = smack_to_secid(smack);
2479 * smack_d_instantiate - Make sure the blob is correct on an inode
2480 * @opt_dentry: dentry where inode will be attached
2481 * @inode: the object
2483 * Set the inode's security blob if it hasn't been done already.
2485 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2487 struct super_block *sbp;
2488 struct superblock_smack *sbsp;
2489 struct inode_smack *isp;
2490 char *csp = smk_of_current();
2493 char trattr[TRANS_TRUE_SIZE];
2501 isp = inode->i_security;
2503 mutex_lock(&isp->smk_lock);
2505 * If the inode is already instantiated
2506 * take the quick way out
2508 if (isp->smk_flags & SMK_INODE_INSTANT)
2512 sbsp = sbp->s_security;
2514 * We're going to use the superblock default label
2515 * if there's no label on the file.
2517 final = sbsp->smk_default;
2520 * If this is the root inode the superblock
2521 * may be in the process of initialization.
2522 * If that is the case use the root value out
2523 * of the superblock.
2525 if (opt_dentry->d_parent == opt_dentry) {
2526 isp->smk_inode = sbsp->smk_root;
2527 isp->smk_flags |= SMK_INODE_INSTANT;
2532 * This is pretty hackish.
2533 * Casey says that we shouldn't have to do
2534 * file system specific code, but it does help
2535 * with keeping it simple.
2537 switch (sbp->s_magic) {
2540 * Casey says that it's a little embarrassing
2541 * that the smack file system doesn't do
2542 * extended attributes.
2544 final = smack_known_star.smk_known;
2548 * Casey says pipes are easy (?)
2550 final = smack_known_star.smk_known;
2552 case DEVPTS_SUPER_MAGIC:
2554 * devpts seems content with the label of the task.
2555 * Programs that change smack have to treat the
2562 * Socket access is controlled by the socket
2563 * structures associated with the task involved.
2565 final = smack_known_star.smk_known;
2567 case PROC_SUPER_MAGIC:
2569 * Casey says procfs appears not to care.
2570 * The superblock default suffices.
2575 * Device labels should come from the filesystem,
2576 * but watch out, because they're volitile,
2577 * getting recreated on every reboot.
2579 final = smack_known_star.smk_known;
2583 * If a smack value has been set we want to use it,
2584 * but since tmpfs isn't giving us the opportunity
2585 * to set mount options simulate setting the
2586 * superblock default.
2590 * This isn't an understood special case.
2591 * Get the value from the xattr.
2595 * UNIX domain sockets use lower level socket data.
2597 if (S_ISSOCK(inode->i_mode)) {
2598 final = smack_known_star.smk_known;
2602 * No xattr support means, alas, no SMACK label.
2603 * Use the aforeapplied default.
2604 * It would be curious if the label of the task
2605 * does not match that assigned.
2607 if (inode->i_op->getxattr == NULL)
2610 * Get the dentry for xattr.
2612 dp = dget(opt_dentry);
2613 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2614 if (fetched != NULL)
2618 * Transmuting directory
2620 if (S_ISDIR(inode->i_mode)) {
2622 * If this is a new directory and the label was
2623 * transmuted when the inode was initialized
2624 * set the transmute attribute on the directory
2625 * and mark the inode.
2627 * If there is a transmute attribute on the
2628 * directory mark the inode.
2630 if (isp->smk_flags & SMK_INODE_CHANGED) {
2631 isp->smk_flags &= ~SMK_INODE_CHANGED;
2632 rc = inode->i_op->setxattr(dp,
2633 XATTR_NAME_SMACKTRANSMUTE,
2634 TRANS_TRUE, TRANS_TRUE_SIZE,
2637 rc = inode->i_op->getxattr(dp,
2638 XATTR_NAME_SMACKTRANSMUTE, trattr,
2640 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2641 TRANS_TRUE_SIZE) != 0)
2645 transflag = SMK_INODE_TRANSMUTE;
2647 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2648 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2655 isp->smk_inode = csp;
2657 isp->smk_inode = final;
2659 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2662 mutex_unlock(&isp->smk_lock);
2667 * smack_getprocattr - Smack process attribute access
2668 * @p: the object task
2669 * @name: the name of the attribute in /proc/.../attr
2670 * @value: where to put the result
2672 * Places a copy of the task Smack into value
2674 * Returns the length of the smack label or an error code
2676 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2681 if (strcmp(name, "current") != 0)
2684 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2694 * smack_setprocattr - Smack process attribute setting
2695 * @p: the object task
2696 * @name: the name of the attribute in /proc/.../attr
2697 * @value: the value to set
2698 * @size: the size of the value
2700 * Sets the Smack value of the task. Only setting self
2701 * is permitted and only with privilege
2703 * Returns the length of the smack label or an error code
2705 static int smack_setprocattr(struct task_struct *p, char *name,
2706 void *value, size_t size)
2709 struct task_smack *tsp;
2710 struct task_smack *oldtsp;
2715 * Changing another process' Smack value is too dangerous
2716 * and supports no sane use case.
2721 if (!smack_privileged(CAP_MAC_ADMIN))
2724 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2727 if (strcmp(name, "current") != 0)
2730 newsmack = smk_import(value, size);
2731 if (newsmack == NULL)
2735 * No process is ever allowed the web ("@") label.
2737 if (newsmack == smack_known_web.smk_known)
2740 oldtsp = p->cred->security;
2741 new = prepare_creds();
2745 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
2750 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2754 new->security = tsp;
2760 * smack_unix_stream_connect - Smack access on UDS
2762 * @other: the other sock
2765 * Return 0 if a subject with the smack of sock could access
2766 * an object with the smack of other, otherwise an error code
2768 static int smack_unix_stream_connect(struct sock *sock,
2769 struct sock *other, struct sock *newsk)
2771 struct socket_smack *ssp = sock->sk_security;
2772 struct socket_smack *osp = other->sk_security;
2773 struct socket_smack *nsp = newsk->sk_security;
2774 struct smk_audit_info ad;
2778 struct lsm_network_audit net;
2780 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2781 smk_ad_setfield_u_net_sk(&ad, other);
2784 if (!smack_privileged(CAP_MAC_OVERRIDE))
2785 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2788 * Cross reference the peer labels for SO_PEERSEC.
2791 nsp->smk_packet = ssp->smk_out;
2792 ssp->smk_packet = osp->smk_out;
2799 * smack_unix_may_send - Smack access on UDS
2801 * @other: the other socket
2803 * Return 0 if a subject with the smack of sock could access
2804 * an object with the smack of other, otherwise an error code
2806 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2808 struct socket_smack *ssp = sock->sk->sk_security;
2809 struct socket_smack *osp = other->sk->sk_security;
2810 struct smk_audit_info ad;
2814 struct lsm_network_audit net;
2816 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2817 smk_ad_setfield_u_net_sk(&ad, other->sk);
2820 if (!smack_privileged(CAP_MAC_OVERRIDE))
2821 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2827 * smack_socket_sendmsg - Smack check based on destination host
2830 * @size: the size of the message
2832 * Return 0 if the current subject can write to the destination
2833 * host. This is only a question if the destination is a single
2836 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2839 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2842 * Perfectly reasonable for this to be NULL
2844 if (sip == NULL || sip->sin_family != AF_INET)
2847 return smack_netlabel_send(sock->sk, sip);
2851 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2852 * @sap: netlabel secattr
2853 * @ssp: socket security information
2855 * Returns a pointer to a Smack label found on the label list.
2857 static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
2858 struct socket_smack *ssp)
2860 struct smack_known *kp;
2864 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2866 * Looks like a CIPSO packet.
2867 * If there are flags but no level netlabel isn't
2868 * behaving the way we expect it to.
2870 * Look it up in the label table
2871 * Without guidance regarding the smack value
2872 * for the packet fall back on the network
2876 list_for_each_entry(kp, &smack_known_list, list) {
2877 if (sap->attr.mls.lvl != kp->smk_netlabel.attr.mls.lvl)
2879 if (memcmp(sap->attr.mls.cat,
2880 kp->smk_netlabel.attr.mls.cat,
2889 return kp->smk_known;
2891 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
2892 return smack_known_web.smk_known;
2893 return smack_known_star.smk_known;
2895 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2897 * Looks like a fallback, which gives us a secid.
2899 sp = smack_from_secid(sap->attr.secid);
2901 * This has got to be a bug because it is
2902 * impossible to specify a fallback without
2903 * specifying the label, which will ensure
2904 * it has a secid, and the only way to get a
2905 * secid is from a fallback.
2911 * Without guidance regarding the smack value
2912 * for the packet fall back on the network
2915 return smack_net_ambient;
2919 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2923 * Returns 0 if the packet should be delivered, an error code otherwise
2925 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2927 struct netlbl_lsm_secattr secattr;
2928 struct socket_smack *ssp = sk->sk_security;
2931 struct smk_audit_info ad;
2933 struct lsm_network_audit net;
2935 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2939 * Translate what netlabel gave us.
2941 netlbl_secattr_init(&secattr);
2943 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2945 csp = smack_from_secattr(&secattr, ssp);
2947 csp = smack_net_ambient;
2949 netlbl_secattr_destroy(&secattr);
2952 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2953 ad.a.u.net->family = sk->sk_family;
2954 ad.a.u.net->netif = skb->skb_iif;
2955 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2958 * Receiving a packet requires that the other end
2959 * be able to write here. Read access is not required.
2960 * This is the simplist possible security model
2963 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2965 netlbl_skbuff_err(skb, rc, 0);
2970 * smack_socket_getpeersec_stream - pull in packet label
2972 * @optval: user's destination
2973 * @optlen: size thereof
2976 * returns zero on success, an error code otherwise
2978 static int smack_socket_getpeersec_stream(struct socket *sock,
2979 char __user *optval,
2980 int __user *optlen, unsigned len)
2982 struct socket_smack *ssp;
2987 ssp = sock->sk->sk_security;
2988 if (ssp->smk_packet != NULL) {
2989 rcp = ssp->smk_packet;
2990 slen = strlen(rcp) + 1;
2995 else if (copy_to_user(optval, rcp, slen) != 0)
2998 if (put_user(slen, optlen) != 0)
3006 * smack_socket_getpeersec_dgram - pull in packet label
3007 * @sock: the peer socket
3009 * @secid: pointer to where to put the secid of the packet
3011 * Sets the netlabel socket state on sk from parent
3013 static int smack_socket_getpeersec_dgram(struct socket *sock,
3014 struct sk_buff *skb, u32 *secid)
3017 struct netlbl_lsm_secattr secattr;
3018 struct socket_smack *ssp = NULL;
3020 int family = PF_UNSPEC;
3021 u32 s = 0; /* 0 is the invalid secid */
3025 if (skb->protocol == htons(ETH_P_IP))
3027 else if (skb->protocol == htons(ETH_P_IPV6))
3030 if (family == PF_UNSPEC && sock != NULL)
3031 family = sock->sk->sk_family;
3033 if (family == PF_UNIX) {
3034 ssp = sock->sk->sk_security;
3035 s = smack_to_secid(ssp->smk_out);
3036 } else if (family == PF_INET || family == PF_INET6) {
3038 * Translate what netlabel gave us.
3040 if (sock != NULL && sock->sk != NULL)
3041 ssp = sock->sk->sk_security;
3042 netlbl_secattr_init(&secattr);
3043 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3045 sp = smack_from_secattr(&secattr, ssp);
3046 s = smack_to_secid(sp);
3048 netlbl_secattr_destroy(&secattr);
3057 * smack_sock_graft - Initialize a newly created socket with an existing sock
3059 * @parent: parent socket
3061 * Set the smk_{in,out} state of an existing sock based on the process that
3062 * is creating the new socket.
3064 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3066 struct socket_smack *ssp;
3069 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3072 ssp = sk->sk_security;
3073 ssp->smk_in = ssp->smk_out = smk_of_current();
3074 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3078 * smack_inet_conn_request - Smack access check on connect
3079 * @sk: socket involved
3083 * Returns 0 if a task with the packet label could write to
3084 * the socket, otherwise an error code
3086 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3087 struct request_sock *req)
3089 u16 family = sk->sk_family;
3090 struct smack_known *skp;
3091 struct socket_smack *ssp = sk->sk_security;
3092 struct netlbl_lsm_secattr secattr;
3093 struct sockaddr_in addr;
3098 struct smk_audit_info ad;
3100 struct lsm_network_audit net;
3103 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3104 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3107 netlbl_secattr_init(&secattr);
3108 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3110 sp = smack_from_secattr(&secattr, ssp);
3112 sp = smack_known_huh.smk_known;
3113 netlbl_secattr_destroy(&secattr);
3116 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3117 ad.a.u.net->family = family;
3118 ad.a.u.net->netif = skb->skb_iif;
3119 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3122 * Receiving a packet requires that the other end be able to write
3123 * here. Read access is not required.
3125 rc = smk_access(sp, ssp->smk_in, MAY_WRITE, &ad);
3130 * Save the peer's label in the request_sock so we can later setup
3131 * smk_packet in the child socket so that SO_PEERCRED can report it.
3133 req->peer_secid = smack_to_secid(sp);
3136 * We need to decide if we want to label the incoming connection here
3137 * if we do we only need to label the request_sock and the stack will
3138 * propagate the wire-label to the sock when it is created.
3141 addr.sin_addr.s_addr = hdr->saddr;
3143 hsp = smack_host_label(&addr);
3147 skp = smk_find_entry(sp);
3148 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3150 netlbl_req_delattr(req);
3156 * smack_inet_csk_clone - Copy the connection information to the new socket
3157 * @sk: the new socket
3158 * @req: the connection's request_sock
3160 * Transfer the connection's peer label to the newly created socket.
3162 static void smack_inet_csk_clone(struct sock *sk,
3163 const struct request_sock *req)
3165 struct socket_smack *ssp = sk->sk_security;
3167 if (req->peer_secid != 0)
3168 ssp->smk_packet = smack_from_secid(req->peer_secid);
3170 ssp->smk_packet = NULL;
3174 * Key management security hooks
3176 * Casey has not tested key support very heavily.
3177 * The permission check is most likely too restrictive.
3178 * If you care about keys please have a look.
3183 * smack_key_alloc - Set the key security blob
3185 * @cred: the credentials to use
3188 * No allocation required
3192 static int smack_key_alloc(struct key *key, const struct cred *cred,
3193 unsigned long flags)
3195 key->security = smk_of_task(cred->security);
3200 * smack_key_free - Clear the key security blob
3203 * Clear the blob pointer
3205 static void smack_key_free(struct key *key)
3207 key->security = NULL;
3211 * smack_key_permission - Smack access on a key
3212 * @key_ref: gets to the object
3213 * @cred: the credentials to use
3216 * Return 0 if the task has read and write to the object,
3217 * an error code otherwise
3219 static int smack_key_permission(key_ref_t key_ref,
3220 const struct cred *cred, key_perm_t perm)
3223 struct smk_audit_info ad;
3224 char *tsp = smk_of_task(cred->security);
3226 keyp = key_ref_to_ptr(key_ref);
3230 * If the key hasn't been initialized give it access so that
3233 if (keyp->security == NULL)
3236 * This should not occur
3241 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3242 ad.a.u.key_struct.key = keyp->serial;
3243 ad.a.u.key_struct.key_desc = keyp->description;
3245 return smk_access(tsp, keyp->security,
3246 MAY_READWRITE, &ad);
3248 #endif /* CONFIG_KEYS */
3253 * Audit requires a unique representation of each Smack specific
3254 * rule. This unique representation is used to distinguish the
3255 * object to be audited from remaining kernel objects and also
3256 * works as a glue between the audit hooks.
3258 * Since repository entries are added but never deleted, we'll use
3259 * the smack_known label address related to the given audit rule as
3260 * the needed unique representation. This also better fits the smack
3261 * model where nearly everything is a label.
3266 * smack_audit_rule_init - Initialize a smack audit rule
3267 * @field: audit rule fields given from user-space (audit.h)
3268 * @op: required testing operator (=, !=, >, <, ...)
3269 * @rulestr: smack label to be audited
3270 * @vrule: pointer to save our own audit rule representation
3272 * Prepare to audit cases where (@field @op @rulestr) is true.
3273 * The label to be audited is created if necessay.
3275 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3277 char **rule = (char **)vrule;
3280 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3283 if (op != Audit_equal && op != Audit_not_equal)
3286 *rule = smk_import(rulestr, 0);
3292 * smack_audit_rule_known - Distinguish Smack audit rules
3293 * @krule: rule of interest, in Audit kernel representation format
3295 * This is used to filter Smack rules from remaining Audit ones.
3296 * If it's proved that this rule belongs to us, the
3297 * audit_rule_match hook will be called to do the final judgement.
3299 static int smack_audit_rule_known(struct audit_krule *krule)
3301 struct audit_field *f;
3304 for (i = 0; i < krule->field_count; i++) {
3305 f = &krule->fields[i];
3307 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3315 * smack_audit_rule_match - Audit given object ?
3316 * @secid: security id for identifying the object to test
3317 * @field: audit rule flags given from user-space
3318 * @op: required testing operator
3319 * @vrule: smack internal rule presentation
3320 * @actx: audit context associated with the check
3322 * The core Audit hook. It's used to take the decision of
3323 * whether to audit or not to audit a given object.
3325 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3326 struct audit_context *actx)
3332 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR,
3333 "Smack: missing rule\n");
3337 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3340 smack = smack_from_secid(secid);
3343 * No need to do string comparisons. If a match occurs,
3344 * both pointers will point to the same smack_known
3347 if (op == Audit_equal)
3348 return (rule == smack);
3349 if (op == Audit_not_equal)
3350 return (rule != smack);
3356 * smack_audit_rule_free - free smack rule representation
3357 * @vrule: rule to be freed.
3359 * No memory was allocated.
3361 static void smack_audit_rule_free(void *vrule)
3366 #endif /* CONFIG_AUDIT */
3369 * smack_secid_to_secctx - return the smack label for a secid
3370 * @secid: incoming integer
3371 * @secdata: destination
3372 * @seclen: how long it is
3374 * Exists for networking code.
3376 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3378 char *sp = smack_from_secid(secid);
3382 *seclen = strlen(sp);
3387 * smack_secctx_to_secid - return the secid for a smack label
3388 * @secdata: smack label
3389 * @seclen: how long result is
3390 * @secid: outgoing integer
3392 * Exists for audit and networking code.
3394 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3396 *secid = smack_to_secid(secdata);
3401 * smack_release_secctx - don't do anything.
3405 * Exists to make sure nothing gets done, and properly
3407 static void smack_release_secctx(char *secdata, u32 seclen)
3411 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3413 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3416 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3418 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3421 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3424 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3432 struct security_operations smack_ops = {
3435 .ptrace_access_check = smack_ptrace_access_check,
3436 .ptrace_traceme = smack_ptrace_traceme,
3437 .syslog = smack_syslog,
3439 .sb_alloc_security = smack_sb_alloc_security,
3440 .sb_free_security = smack_sb_free_security,
3441 .sb_copy_data = smack_sb_copy_data,
3442 .sb_kern_mount = smack_sb_kern_mount,
3443 .sb_statfs = smack_sb_statfs,
3444 .sb_mount = smack_sb_mount,
3445 .sb_umount = smack_sb_umount,
3447 .bprm_set_creds = smack_bprm_set_creds,
3448 .bprm_committing_creds = smack_bprm_committing_creds,
3449 .bprm_secureexec = smack_bprm_secureexec,
3451 .inode_alloc_security = smack_inode_alloc_security,
3452 .inode_free_security = smack_inode_free_security,
3453 .inode_init_security = smack_inode_init_security,
3454 .inode_link = smack_inode_link,
3455 .inode_unlink = smack_inode_unlink,
3456 .inode_rmdir = smack_inode_rmdir,
3457 .inode_rename = smack_inode_rename,
3458 .inode_permission = smack_inode_permission,
3459 .inode_setattr = smack_inode_setattr,
3460 .inode_getattr = smack_inode_getattr,
3461 .inode_setxattr = smack_inode_setxattr,
3462 .inode_post_setxattr = smack_inode_post_setxattr,
3463 .inode_getxattr = smack_inode_getxattr,
3464 .inode_removexattr = smack_inode_removexattr,
3465 .inode_getsecurity = smack_inode_getsecurity,
3466 .inode_setsecurity = smack_inode_setsecurity,
3467 .inode_listsecurity = smack_inode_listsecurity,
3468 .inode_getsecid = smack_inode_getsecid,
3470 .file_permission = smack_file_permission,
3471 .file_alloc_security = smack_file_alloc_security,
3472 .file_free_security = smack_file_free_security,
3473 .file_ioctl = smack_file_ioctl,
3474 .file_lock = smack_file_lock,
3475 .file_fcntl = smack_file_fcntl,
3476 .mmap_file = smack_mmap_file,
3477 .mmap_addr = cap_mmap_addr,
3478 .file_set_fowner = smack_file_set_fowner,
3479 .file_send_sigiotask = smack_file_send_sigiotask,
3480 .file_receive = smack_file_receive,
3482 .file_open = smack_file_open,
3484 .cred_alloc_blank = smack_cred_alloc_blank,
3485 .cred_free = smack_cred_free,
3486 .cred_prepare = smack_cred_prepare,
3487 .cred_transfer = smack_cred_transfer,
3488 .kernel_act_as = smack_kernel_act_as,
3489 .kernel_create_files_as = smack_kernel_create_files_as,
3490 .task_setpgid = smack_task_setpgid,
3491 .task_getpgid = smack_task_getpgid,
3492 .task_getsid = smack_task_getsid,
3493 .task_getsecid = smack_task_getsecid,
3494 .task_setnice = smack_task_setnice,
3495 .task_setioprio = smack_task_setioprio,
3496 .task_getioprio = smack_task_getioprio,
3497 .task_setscheduler = smack_task_setscheduler,
3498 .task_getscheduler = smack_task_getscheduler,
3499 .task_movememory = smack_task_movememory,
3500 .task_kill = smack_task_kill,
3501 .task_wait = smack_task_wait,
3502 .task_to_inode = smack_task_to_inode,
3504 .ipc_permission = smack_ipc_permission,
3505 .ipc_getsecid = smack_ipc_getsecid,
3507 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3508 .msg_msg_free_security = smack_msg_msg_free_security,
3510 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3511 .msg_queue_free_security = smack_msg_queue_free_security,
3512 .msg_queue_associate = smack_msg_queue_associate,
3513 .msg_queue_msgctl = smack_msg_queue_msgctl,
3514 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3515 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3517 .shm_alloc_security = smack_shm_alloc_security,
3518 .shm_free_security = smack_shm_free_security,
3519 .shm_associate = smack_shm_associate,
3520 .shm_shmctl = smack_shm_shmctl,
3521 .shm_shmat = smack_shm_shmat,
3523 .sem_alloc_security = smack_sem_alloc_security,
3524 .sem_free_security = smack_sem_free_security,
3525 .sem_associate = smack_sem_associate,
3526 .sem_semctl = smack_sem_semctl,
3527 .sem_semop = smack_sem_semop,
3529 .d_instantiate = smack_d_instantiate,
3531 .getprocattr = smack_getprocattr,
3532 .setprocattr = smack_setprocattr,
3534 .unix_stream_connect = smack_unix_stream_connect,
3535 .unix_may_send = smack_unix_may_send,
3537 .socket_post_create = smack_socket_post_create,
3538 .socket_connect = smack_socket_connect,
3539 .socket_sendmsg = smack_socket_sendmsg,
3540 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3541 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3542 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3543 .sk_alloc_security = smack_sk_alloc_security,
3544 .sk_free_security = smack_sk_free_security,
3545 .sock_graft = smack_sock_graft,
3546 .inet_conn_request = smack_inet_conn_request,
3547 .inet_csk_clone = smack_inet_csk_clone,
3549 /* key management security hooks */
3551 .key_alloc = smack_key_alloc,
3552 .key_free = smack_key_free,
3553 .key_permission = smack_key_permission,
3554 #endif /* CONFIG_KEYS */
3558 .audit_rule_init = smack_audit_rule_init,
3559 .audit_rule_known = smack_audit_rule_known,
3560 .audit_rule_match = smack_audit_rule_match,
3561 .audit_rule_free = smack_audit_rule_free,
3562 #endif /* CONFIG_AUDIT */
3564 .secid_to_secctx = smack_secid_to_secctx,
3565 .secctx_to_secid = smack_secctx_to_secid,
3566 .release_secctx = smack_release_secctx,
3567 .inode_notifysecctx = smack_inode_notifysecctx,
3568 .inode_setsecctx = smack_inode_setsecctx,
3569 .inode_getsecctx = smack_inode_getsecctx,
3573 static __init void init_smack_known_list(void)
3576 * Initialize rule list locks
3578 mutex_init(&smack_known_huh.smk_rules_lock);
3579 mutex_init(&smack_known_hat.smk_rules_lock);
3580 mutex_init(&smack_known_floor.smk_rules_lock);
3581 mutex_init(&smack_known_star.smk_rules_lock);
3582 mutex_init(&smack_known_invalid.smk_rules_lock);
3583 mutex_init(&smack_known_web.smk_rules_lock);
3585 * Initialize rule lists
3587 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3588 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3589 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3590 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3591 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3592 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3594 * Create the known labels list
3596 list_add(&smack_known_huh.list, &smack_known_list);
3597 list_add(&smack_known_hat.list, &smack_known_list);
3598 list_add(&smack_known_star.list, &smack_known_list);
3599 list_add(&smack_known_floor.list, &smack_known_list);
3600 list_add(&smack_known_invalid.list, &smack_known_list);
3601 list_add(&smack_known_web.list, &smack_known_list);
3605 * smack_init - initialize the smack system
3609 static __init int smack_init(void)
3612 struct task_smack *tsp;
3614 if (!security_module_enable(&smack_ops))
3617 tsp = new_task_smack(smack_known_floor.smk_known,
3618 smack_known_floor.smk_known, GFP_KERNEL);
3622 printk(KERN_INFO "Smack: Initializing.\n");
3625 * Set the security state for the initial task.
3627 cred = (struct cred *) current->cred;
3628 cred->security = tsp;
3630 /* initialize the smack_known_list */
3631 init_smack_known_list();
3636 if (register_security(&smack_ops))
3637 panic("smack: Unable to register with kernel.\n");
3643 * Smack requires early initialization in order to label
3644 * all processes and objects when they are created.
3646 security_initcall(smack_init);