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 <ext-jarkko.2.sakkinen@nokia.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.moore@hp.com>
13 * Copyright (C) 2010 Nokia Corporation
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2,
17 * as published by the Free Software Foundation.
20 #include <linux/xattr.h>
21 #include <linux/pagemap.h>
22 #include <linux/mount.h>
23 #include <linux/stat.h>
25 #include <asm/ioctls.h>
27 #include <linux/tcp.h>
28 #include <linux/udp.h>
29 #include <linux/slab.h>
30 #include <linux/mutex.h>
31 #include <linux/pipe_fs_i.h>
32 #include <net/netlabel.h>
33 #include <net/cipso_ipv4.h>
34 #include <linux/audit.h>
35 #include <linux/magic.h>
38 #define task_security(task) (task_cred_xxx((task), security))
40 #define TRANS_TRUE "TRUE"
41 #define TRANS_TRUE_SIZE 4
44 * smk_fetch - Fetch the smack label from a file.
45 * @ip: a pointer to the inode
46 * @dp: a pointer to the dentry
48 * Returns a pointer to the master list entry for the Smack label
49 * or NULL if there was no label to fetch.
51 static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
54 char in[SMK_LABELLEN];
56 if (ip->i_op->getxattr == NULL)
59 rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
63 return smk_import(in, rc);
67 * new_inode_smack - allocate an inode security blob
68 * @smack: a pointer to the Smack label to use in the blob
70 * Returns the new blob or NULL if there's no memory available
72 struct inode_smack *new_inode_smack(char *smack)
74 struct inode_smack *isp;
76 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
80 isp->smk_inode = smack;
82 mutex_init(&isp->smk_lock);
88 * new_task_smack - allocate a task security blob
89 * @smack: a pointer to the Smack label to use in the blob
91 * Returns the new blob or NULL if there's no memory available
93 static struct task_smack *new_task_smack(char *task, char *forked, gfp_t gfp)
95 struct task_smack *tsp;
97 tsp = kzalloc(sizeof(struct task_smack), gfp);
101 tsp->smk_task = task;
102 tsp->smk_forked = forked;
103 INIT_LIST_HEAD(&tsp->smk_rules);
104 mutex_init(&tsp->smk_rules_lock);
110 * smk_copy_rules - copy a rule set
111 * @nhead - new rules header pointer
112 * @ohead - old rules header pointer
114 * Returns 0 on success, -ENOMEM on error
116 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
119 struct smack_rule *nrp;
120 struct smack_rule *orp;
123 INIT_LIST_HEAD(nhead);
125 list_for_each_entry_rcu(orp, ohead, list) {
126 nrp = kzalloc(sizeof(struct smack_rule), gfp);
132 list_add_rcu(&nrp->list, nhead);
139 * We he, that is fun!
143 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
144 * @ctp: child task pointer
145 * @mode: ptrace attachment mode
147 * Returns 0 if access is OK, an error code otherwise
149 * Do the capability checks, and require read and write.
151 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
154 struct smk_audit_info ad;
157 rc = cap_ptrace_access_check(ctp, mode);
161 tsp = smk_of_task(task_security(ctp));
162 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
163 smk_ad_setfield_u_tsk(&ad, ctp);
165 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
170 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
171 * @ptp: parent task pointer
173 * Returns 0 if access is OK, an error code otherwise
175 * Do the capability checks, and require read and write.
177 static int smack_ptrace_traceme(struct task_struct *ptp)
180 struct smk_audit_info ad;
183 rc = cap_ptrace_traceme(ptp);
187 tsp = smk_of_task(task_security(ptp));
188 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
189 smk_ad_setfield_u_tsk(&ad, ptp);
191 rc = smk_curacc(tsp, MAY_READWRITE, &ad);
196 * smack_syslog - Smack approval on syslog
197 * @type: message type
199 * Require that the task has the floor label
201 * Returns 0 on success, error code otherwise.
203 static int smack_syslog(int typefrom_file)
206 char *sp = smk_of_current();
208 if (capable(CAP_MAC_OVERRIDE))
211 if (sp != smack_known_floor.smk_known)
223 * smack_sb_alloc_security - allocate a superblock blob
224 * @sb: the superblock getting the blob
226 * Returns 0 on success or -ENOMEM on error.
228 static int smack_sb_alloc_security(struct super_block *sb)
230 struct superblock_smack *sbsp;
232 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
237 sbsp->smk_root = smack_known_floor.smk_known;
238 sbsp->smk_default = smack_known_floor.smk_known;
239 sbsp->smk_floor = smack_known_floor.smk_known;
240 sbsp->smk_hat = smack_known_hat.smk_known;
241 sbsp->smk_initialized = 0;
242 spin_lock_init(&sbsp->smk_sblock);
244 sb->s_security = sbsp;
250 * smack_sb_free_security - free a superblock blob
251 * @sb: the superblock getting the blob
254 static void smack_sb_free_security(struct super_block *sb)
256 kfree(sb->s_security);
257 sb->s_security = NULL;
261 * smack_sb_copy_data - copy mount options data for processing
262 * @orig: where to start
263 * @smackopts: mount options string
265 * Returns 0 on success or -ENOMEM on error.
267 * Copy the Smack specific mount options out of the mount
270 static int smack_sb_copy_data(char *orig, char *smackopts)
272 char *cp, *commap, *otheropts, *dp;
274 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
275 if (otheropts == NULL)
278 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
279 if (strstr(cp, SMK_FSDEFAULT) == cp)
281 else if (strstr(cp, SMK_FSFLOOR) == cp)
283 else if (strstr(cp, SMK_FSHAT) == cp)
285 else if (strstr(cp, SMK_FSROOT) == cp)
290 commap = strchr(cp, ',');
299 strcpy(orig, otheropts);
300 free_page((unsigned long)otheropts);
306 * smack_sb_kern_mount - Smack specific mount processing
307 * @sb: the file system superblock
308 * @flags: the mount flags
309 * @data: the smack mount options
311 * Returns 0 on success, an error code on failure
313 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
315 struct dentry *root = sb->s_root;
316 struct inode *inode = root->d_inode;
317 struct superblock_smack *sp = sb->s_security;
318 struct inode_smack *isp;
323 spin_lock(&sp->smk_sblock);
324 if (sp->smk_initialized != 0) {
325 spin_unlock(&sp->smk_sblock);
328 sp->smk_initialized = 1;
329 spin_unlock(&sp->smk_sblock);
331 for (op = data; op != NULL; op = commap) {
332 commap = strchr(op, ',');
336 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
337 op += strlen(SMK_FSHAT);
338 nsp = smk_import(op, 0);
341 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
342 op += strlen(SMK_FSFLOOR);
343 nsp = smk_import(op, 0);
346 } else if (strncmp(op, SMK_FSDEFAULT,
347 strlen(SMK_FSDEFAULT)) == 0) {
348 op += strlen(SMK_FSDEFAULT);
349 nsp = smk_import(op, 0);
351 sp->smk_default = nsp;
352 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
353 op += strlen(SMK_FSROOT);
354 nsp = smk_import(op, 0);
361 * Initialize the root inode.
363 isp = inode->i_security;
365 inode->i_security = new_inode_smack(sp->smk_root);
367 isp->smk_inode = sp->smk_root;
373 * smack_sb_statfs - Smack check on statfs
374 * @dentry: identifies the file system in question
376 * Returns 0 if current can read the floor of the filesystem,
377 * and error code otherwise
379 static int smack_sb_statfs(struct dentry *dentry)
381 struct superblock_smack *sbp = dentry->d_sb->s_security;
383 struct smk_audit_info ad;
385 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
386 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
388 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
393 * smack_sb_mount - Smack check for mounting
400 * Returns 0 if current can write the floor of the filesystem
401 * being mounted on, an error code otherwise.
403 static int smack_sb_mount(char *dev_name, struct path *path,
404 char *type, unsigned long flags, void *data)
406 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
407 struct smk_audit_info ad;
409 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
410 smk_ad_setfield_u_fs_path(&ad, *path);
412 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
416 * smack_sb_umount - Smack check for unmounting
417 * @mnt: file system to unmount
420 * Returns 0 if current can write the floor of the filesystem
421 * being unmounted, an error code otherwise.
423 static int smack_sb_umount(struct vfsmount *mnt, int flags)
425 struct superblock_smack *sbp;
426 struct smk_audit_info ad;
428 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
429 smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root);
430 smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
432 sbp = mnt->mnt_sb->s_security;
433 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
440 static int smack_bprm_set_creds(struct linux_binprm *bprm)
442 struct task_smack *tsp = bprm->cred->security;
443 struct inode_smack *isp;
447 rc = cap_bprm_set_creds(bprm);
451 if (bprm->cred_prepared)
454 if (bprm->file == NULL || bprm->file->f_dentry == NULL)
457 dp = bprm->file->f_dentry;
459 if (dp->d_inode == NULL)
462 isp = dp->d_inode->i_security;
464 if (isp->smk_task != NULL)
465 tsp->smk_task = isp->smk_task;
475 * smack_inode_alloc_security - allocate an inode blob
476 * @inode: the inode in need of a blob
478 * Returns 0 if it gets a blob, -ENOMEM otherwise
480 static int smack_inode_alloc_security(struct inode *inode)
482 inode->i_security = new_inode_smack(smk_of_current());
483 if (inode->i_security == NULL)
489 * smack_inode_free_security - free an inode blob
490 * @inode: the inode with a blob
492 * Clears the blob pointer in inode
494 static void smack_inode_free_security(struct inode *inode)
496 kfree(inode->i_security);
497 inode->i_security = NULL;
501 * smack_inode_init_security - copy out the smack from an inode
504 * @name: where to put the attribute name
505 * @value: where to put the attribute value
506 * @len: where to put the length of the attribute
508 * Returns 0 if it all works out, -ENOMEM if there's no memory
510 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
511 char **name, void **value, size_t *len)
513 char *isp = smk_of_inode(inode);
514 char *dsp = smk_of_inode(dir);
518 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
525 may = smk_access_entry(smk_of_current(), dsp, &smack_rule_list);
529 * If the access rule allows transmutation and
530 * the directory requests transmutation then
531 * by all means transmute.
533 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
534 smk_inode_transmutable(dir))
537 *value = kstrdup(isp, GFP_KERNEL);
543 *len = strlen(isp) + 1;
549 * smack_inode_link - Smack check on link
550 * @old_dentry: the existing object
552 * @new_dentry: the new object
554 * Returns 0 if access is permitted, an error code otherwise
556 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
557 struct dentry *new_dentry)
560 struct smk_audit_info ad;
563 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
564 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
566 isp = smk_of_inode(old_dentry->d_inode);
567 rc = smk_curacc(isp, MAY_WRITE, &ad);
569 if (rc == 0 && new_dentry->d_inode != NULL) {
570 isp = smk_of_inode(new_dentry->d_inode);
571 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
572 rc = smk_curacc(isp, MAY_WRITE, &ad);
579 * smack_inode_unlink - Smack check on inode deletion
580 * @dir: containing directory object
581 * @dentry: file to unlink
583 * Returns 0 if current can write the containing directory
584 * and the object, error code otherwise
586 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
588 struct inode *ip = dentry->d_inode;
589 struct smk_audit_info ad;
592 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
593 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
596 * You need write access to the thing you're unlinking
598 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
601 * You also need write access to the containing directory
603 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
604 smk_ad_setfield_u_fs_inode(&ad, dir);
605 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
611 * smack_inode_rmdir - Smack check on directory deletion
612 * @dir: containing directory object
613 * @dentry: directory to unlink
615 * Returns 0 if current can write the containing directory
616 * and the directory, error code otherwise
618 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
620 struct smk_audit_info ad;
623 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
624 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
627 * You need write access to the thing you're removing
629 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
632 * You also need write access to the containing directory
634 smk_ad_setfield_u_fs_path_dentry(&ad, NULL);
635 smk_ad_setfield_u_fs_inode(&ad, dir);
636 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
643 * smack_inode_rename - Smack check on rename
644 * @old_inode: the old directory
645 * @old_dentry: unused
646 * @new_inode: the new directory
647 * @new_dentry: unused
649 * Read and write access is required on both the old and
652 * Returns 0 if access is permitted, an error code otherwise
654 static int smack_inode_rename(struct inode *old_inode,
655 struct dentry *old_dentry,
656 struct inode *new_inode,
657 struct dentry *new_dentry)
661 struct smk_audit_info ad;
663 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
664 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
666 isp = smk_of_inode(old_dentry->d_inode);
667 rc = smk_curacc(isp, MAY_READWRITE, &ad);
669 if (rc == 0 && new_dentry->d_inode != NULL) {
670 isp = smk_of_inode(new_dentry->d_inode);
671 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
672 rc = smk_curacc(isp, MAY_READWRITE, &ad);
678 * smack_inode_permission - Smack version of permission()
679 * @inode: the inode in question
680 * @mask: the access requested
682 * This is the important Smack hook.
684 * Returns 0 if access is permitted, -EACCES otherwise
686 static int smack_inode_permission(struct inode *inode, int mask)
688 struct smk_audit_info ad;
690 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
692 * No permission to check. Existence test. Yup, it's there.
696 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
697 smk_ad_setfield_u_fs_inode(&ad, inode);
698 return smk_curacc(smk_of_inode(inode), mask, &ad);
702 * smack_inode_setattr - Smack check for setting attributes
703 * @dentry: the object
704 * @iattr: for the force flag
706 * Returns 0 if access is permitted, an error code otherwise
708 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
710 struct smk_audit_info ad;
712 * Need to allow for clearing the setuid bit.
714 if (iattr->ia_valid & ATTR_FORCE)
716 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
717 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
719 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
723 * smack_inode_getattr - Smack check for getting attributes
725 * @dentry: the object
727 * Returns 0 if access is permitted, an error code otherwise
729 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
731 struct smk_audit_info ad;
733 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
734 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
735 smk_ad_setfield_u_fs_path_mnt(&ad, mnt);
736 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
740 * smack_inode_setxattr - Smack check for setting xattrs
741 * @dentry: the object
742 * @name: name of the attribute
747 * This protects the Smack attribute explicitly.
749 * Returns 0 if access is permitted, an error code otherwise
751 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
752 const void *value, size_t size, int flags)
754 struct smk_audit_info ad;
757 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
758 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
759 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
760 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
761 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
762 if (!capable(CAP_MAC_ADMIN))
765 * check label validity here so import wont fail on
768 if (size == 0 || size >= SMK_LABELLEN ||
769 smk_import(value, size) == NULL)
771 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
772 if (!capable(CAP_MAC_ADMIN))
774 if (size != TRANS_TRUE_SIZE ||
775 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
778 rc = cap_inode_setxattr(dentry, name, value, size, flags);
780 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
781 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
784 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
790 * smack_inode_post_setxattr - Apply the Smack update approved above
792 * @name: attribute name
793 * @value: attribute value
794 * @size: attribute size
797 * Set the pointer in the inode blob to the entry found
798 * in the master label list.
800 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
801 const void *value, size_t size, int flags)
804 struct inode_smack *isp = dentry->d_inode->i_security;
806 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
807 nsp = smk_import(value, size);
809 isp->smk_inode = nsp;
811 isp->smk_inode = smack_known_invalid.smk_known;
812 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
813 nsp = smk_import(value, size);
817 isp->smk_task = smack_known_invalid.smk_known;
818 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
819 nsp = smk_import(value, size);
823 isp->smk_mmap = smack_known_invalid.smk_known;
824 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0)
825 isp->smk_flags |= SMK_INODE_TRANSMUTE;
831 * smack_inode_getxattr - Smack check on getxattr
832 * @dentry: the object
835 * Returns 0 if access is permitted, an error code otherwise
837 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
839 struct smk_audit_info ad;
841 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
842 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
844 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
848 * smack_inode_removexattr - Smack check on removexattr
849 * @dentry: the object
850 * @name: name of the attribute
852 * Removing the Smack attribute requires CAP_MAC_ADMIN
854 * Returns 0 if access is permitted, an error code otherwise
856 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
858 struct inode_smack *isp;
859 struct smk_audit_info ad;
862 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
863 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
864 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
865 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
866 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
867 strcmp(name, XATTR_NAME_SMACKMMAP)) {
868 if (!capable(CAP_MAC_ADMIN))
871 rc = cap_inode_removexattr(dentry, name);
873 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
874 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
876 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
879 isp = dentry->d_inode->i_security;
880 isp->smk_task = NULL;
881 isp->smk_mmap = NULL;
888 * smack_inode_getsecurity - get smack xattrs
890 * @name: attribute name
891 * @buffer: where to put the result
894 * Returns the size of the attribute or an error code
896 static int smack_inode_getsecurity(const struct inode *inode,
897 const char *name, void **buffer,
900 struct socket_smack *ssp;
902 struct super_block *sbp;
903 struct inode *ip = (struct inode *)inode;
908 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
909 isp = smk_of_inode(inode);
910 ilen = strlen(isp) + 1;
916 * The rest of the Smack xattrs are only on sockets.
919 if (sbp->s_magic != SOCKFS_MAGIC)
923 if (sock == NULL || sock->sk == NULL)
926 ssp = sock->sk->sk_security;
928 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
930 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
935 ilen = strlen(isp) + 1;
946 * smack_inode_listsecurity - list the Smack attributes
948 * @buffer: where they go
949 * @buffer_size: size of buffer
951 * Returns 0 on success, -EINVAL otherwise
953 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
956 int len = strlen(XATTR_NAME_SMACK);
958 if (buffer != NULL && len <= buffer_size) {
959 memcpy(buffer, XATTR_NAME_SMACK, len);
966 * smack_inode_getsecid - Extract inode's security id
967 * @inode: inode to extract the info from
968 * @secid: where result will be saved
970 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
972 struct inode_smack *isp = inode->i_security;
974 *secid = smack_to_secid(isp->smk_inode);
982 * smack_file_permission - Smack check on file operations
988 * Should access checks be done on each read or write?
989 * UNICOS and SELinux say yes.
990 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
992 * I'll say no for now. Smack does not do the frequent
993 * label changing that SELinux does.
995 static int smack_file_permission(struct file *file, int mask)
1001 * smack_file_alloc_security - assign a file security blob
1004 * The security blob for a file is a pointer to the master
1005 * label list, so no allocation is done.
1009 static int smack_file_alloc_security(struct file *file)
1011 file->f_security = smk_of_current();
1016 * smack_file_free_security - clear a file security blob
1019 * The security blob for a file is a pointer to the master
1020 * label list, so no memory is freed.
1022 static void smack_file_free_security(struct file *file)
1024 file->f_security = NULL;
1028 * smack_file_ioctl - Smack check on ioctls
1033 * Relies heavily on the correct use of the ioctl command conventions.
1035 * Returns 0 if allowed, error code otherwise
1037 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1041 struct smk_audit_info ad;
1043 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
1044 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1046 if (_IOC_DIR(cmd) & _IOC_WRITE)
1047 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1049 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1050 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1056 * smack_file_lock - Smack check on file locking
1060 * Returns 0 if current has write access, error code otherwise
1062 static int smack_file_lock(struct file *file, unsigned int cmd)
1064 struct smk_audit_info ad;
1066 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
1067 smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry);
1068 return smk_curacc(file->f_security, MAY_WRITE, &ad);
1072 * smack_file_fcntl - Smack check on fcntl
1074 * @cmd: what action to check
1077 * Returns 0 if current has access, error code otherwise
1079 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1082 struct smk_audit_info ad;
1085 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS);
1086 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1095 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1103 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1106 rc = smk_curacc(file->f_security, MAY_READWRITE, &ad);
1113 * smk_mmap_list_check - the mmap check
1114 * @sub: subject label
1115 * @obj: object label
1116 * @access: access mode
1117 * @local: the task specific rule list
1119 * Returns 0 if acces is permitted, -EACCES otherwise
1121 static int smk_mmap_list_check(char *sub, char *obj, int access,
1122 struct list_head *local)
1127 * If there is not a global rule that
1128 * allows access say no.
1130 may = smk_access_entry(sub, obj, &smack_rule_list);
1131 if (may == -ENOENT || (may & access) != access)
1134 * If there is a task local rule that
1135 * denies access say no.
1137 may = smk_access_entry(sub, obj, local);
1138 if (may != -ENOENT && (may & access) != access)
1146 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1147 * if mapping anonymous memory.
1148 * @file contains the file structure for file to map (may be NULL).
1149 * @reqprot contains the protection requested by the application.
1150 * @prot contains the protection that will be applied by the kernel.
1151 * @flags contains the operational flags.
1152 * Return 0 if permission is granted.
1154 static int smack_file_mmap(struct file *file,
1155 unsigned long reqprot, unsigned long prot,
1156 unsigned long flags, unsigned long addr,
1157 unsigned long addr_only)
1159 struct smack_rule *srp;
1160 struct task_smack *tsp;
1163 struct inode_smack *isp;
1167 /* do DAC check on address space usage */
1168 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1169 if (rc || addr_only)
1172 if (file == NULL || file->f_dentry == NULL)
1175 dp = file->f_dentry;
1177 if (dp->d_inode == NULL)
1180 isp = dp->d_inode->i_security;
1181 if (isp->smk_mmap == NULL)
1183 msmack = isp->smk_mmap;
1185 tsp = current_security();
1186 sp = smk_of_current();
1191 * For each Smack rule associated with the subject
1192 * label verify that the SMACK64MMAP also has access
1193 * to that rule's object label.
1195 * Because neither of the labels comes
1196 * from the networking code it is sufficient
1197 * to compare pointers.
1199 list_for_each_entry_rcu(srp, &smack_rule_list, list) {
1200 if (srp->smk_subject != sp)
1203 * Matching labels always allows access.
1205 if (msmack == srp->smk_object)
1208 rc = smk_mmap_list_check(msmack, srp->smk_object,
1209 srp->smk_access, &tsp->smk_rules);
1220 * smack_file_set_fowner - set the file security blob value
1221 * @file: object in question
1224 * Further research may be required on this one.
1226 static int smack_file_set_fowner(struct file *file)
1228 file->f_security = smk_of_current();
1233 * smack_file_send_sigiotask - Smack on sigio
1234 * @tsk: The target task
1235 * @fown: the object the signal come from
1238 * Allow a privileged task to get signals even if it shouldn't
1240 * Returns 0 if a subject with the object's smack could
1241 * write to the task, an error code otherwise.
1243 static int smack_file_send_sigiotask(struct task_struct *tsk,
1244 struct fown_struct *fown, int signum)
1248 char *tsp = smk_of_task(tsk->cred->security);
1249 struct smk_audit_info ad;
1252 * struct fown_struct is never outside the context of a struct file
1254 file = container_of(fown, struct file, f_owner);
1256 /* we don't log here as rc can be overriden */
1257 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1258 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1261 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1262 smk_ad_setfield_u_tsk(&ad, tsk);
1263 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1268 * smack_file_receive - Smack file receive check
1271 * Returns 0 if current has access, error code otherwise
1273 static int smack_file_receive(struct file *file)
1276 struct smk_audit_info ad;
1278 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1279 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1281 * This code relies on bitmasks.
1283 if (file->f_mode & FMODE_READ)
1285 if (file->f_mode & FMODE_WRITE)
1288 return smk_curacc(file->f_security, may, &ad);
1296 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1297 * @new: the new credentials
1298 * @gfp: the atomicity of any memory allocations
1300 * Prepare a blank set of credentials for modification. This must allocate all
1301 * the memory the LSM module might require such that cred_transfer() can
1302 * complete without error.
1304 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1306 struct task_smack *tsp;
1308 tsp = new_task_smack(NULL, NULL, gfp);
1312 cred->security = tsp;
1319 * smack_cred_free - "free" task-level security credentials
1320 * @cred: the credentials in question
1323 static void smack_cred_free(struct cred *cred)
1325 struct task_smack *tsp = cred->security;
1326 struct smack_rule *rp;
1327 struct list_head *l;
1328 struct list_head *n;
1332 cred->security = NULL;
1334 list_for_each_safe(l, n, &tsp->smk_rules) {
1335 rp = list_entry(l, struct smack_rule, list);
1336 list_del(&rp->list);
1343 * smack_cred_prepare - prepare new set of credentials for modification
1344 * @new: the new credentials
1345 * @old: the original credentials
1346 * @gfp: the atomicity of any memory allocations
1348 * Prepare a new set of credentials for modification.
1350 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1353 struct task_smack *old_tsp = old->security;
1354 struct task_smack *new_tsp;
1357 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1358 if (new_tsp == NULL)
1361 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1365 new->security = new_tsp;
1370 * smack_cred_transfer - Transfer the old credentials to the new credentials
1371 * @new: the new credentials
1372 * @old: the original credentials
1374 * Fill in a set of blank credentials from another set of credentials.
1376 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1378 struct task_smack *old_tsp = old->security;
1379 struct task_smack *new_tsp = new->security;
1381 new_tsp->smk_task = old_tsp->smk_task;
1382 new_tsp->smk_forked = old_tsp->smk_task;
1383 mutex_init(&new_tsp->smk_rules_lock);
1384 INIT_LIST_HEAD(&new_tsp->smk_rules);
1387 /* cbs copy rule list */
1391 * smack_kernel_act_as - Set the subjective context in a set of credentials
1392 * @new: points to the set of credentials to be modified.
1393 * @secid: specifies the security ID to be set
1395 * Set the security data for a kernel service.
1397 static int smack_kernel_act_as(struct cred *new, u32 secid)
1399 struct task_smack *new_tsp = new->security;
1400 char *smack = smack_from_secid(secid);
1405 new_tsp->smk_task = smack;
1410 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1411 * @new: points to the set of credentials to be modified
1412 * @inode: points to the inode to use as a reference
1414 * Set the file creation context in a set of credentials to the same
1415 * as the objective context of the specified inode
1417 static int smack_kernel_create_files_as(struct cred *new,
1418 struct inode *inode)
1420 struct inode_smack *isp = inode->i_security;
1421 struct task_smack *tsp = new->security;
1423 tsp->smk_forked = isp->smk_inode;
1424 tsp->smk_task = isp->smk_inode;
1429 * smk_curacc_on_task - helper to log task related access
1430 * @p: the task object
1431 * @access : the access requested
1433 * Return 0 if access is permitted
1435 static int smk_curacc_on_task(struct task_struct *p, int access)
1437 struct smk_audit_info ad;
1439 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1440 smk_ad_setfield_u_tsk(&ad, p);
1441 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1445 * smack_task_setpgid - Smack check on setting pgid
1446 * @p: the task object
1449 * Return 0 if write access is permitted
1451 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1453 return smk_curacc_on_task(p, MAY_WRITE);
1457 * smack_task_getpgid - Smack access check for getpgid
1458 * @p: the object task
1460 * Returns 0 if current can read the object task, error code otherwise
1462 static int smack_task_getpgid(struct task_struct *p)
1464 return smk_curacc_on_task(p, MAY_READ);
1468 * smack_task_getsid - Smack access check for getsid
1469 * @p: the object task
1471 * Returns 0 if current can read the object task, error code otherwise
1473 static int smack_task_getsid(struct task_struct *p)
1475 return smk_curacc_on_task(p, MAY_READ);
1479 * smack_task_getsecid - get the secid of the task
1480 * @p: the object task
1481 * @secid: where to put the result
1483 * Sets the secid to contain a u32 version of the smack label.
1485 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1487 *secid = smack_to_secid(smk_of_task(task_security(p)));
1491 * smack_task_setnice - Smack check on setting nice
1492 * @p: the task object
1495 * Return 0 if write access is permitted
1497 static int smack_task_setnice(struct task_struct *p, int nice)
1501 rc = cap_task_setnice(p, nice);
1503 rc = smk_curacc_on_task(p, MAY_WRITE);
1508 * smack_task_setioprio - Smack check on setting ioprio
1509 * @p: the task object
1512 * Return 0 if write access is permitted
1514 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1518 rc = cap_task_setioprio(p, ioprio);
1520 rc = smk_curacc_on_task(p, MAY_WRITE);
1525 * smack_task_getioprio - Smack check on reading ioprio
1526 * @p: the task object
1528 * Return 0 if read access is permitted
1530 static int smack_task_getioprio(struct task_struct *p)
1532 return smk_curacc_on_task(p, MAY_READ);
1536 * smack_task_setscheduler - Smack check on setting scheduler
1537 * @p: the task object
1541 * Return 0 if read access is permitted
1543 static int smack_task_setscheduler(struct task_struct *p)
1547 rc = cap_task_setscheduler(p);
1549 rc = smk_curacc_on_task(p, MAY_WRITE);
1554 * smack_task_getscheduler - Smack check on reading scheduler
1555 * @p: the task object
1557 * Return 0 if read access is permitted
1559 static int smack_task_getscheduler(struct task_struct *p)
1561 return smk_curacc_on_task(p, MAY_READ);
1565 * smack_task_movememory - Smack check on moving memory
1566 * @p: the task object
1568 * Return 0 if write access is permitted
1570 static int smack_task_movememory(struct task_struct *p)
1572 return smk_curacc_on_task(p, MAY_WRITE);
1576 * smack_task_kill - Smack check on signal delivery
1577 * @p: the task object
1580 * @secid: identifies the smack to use in lieu of current's
1582 * Return 0 if write access is permitted
1584 * The secid behavior is an artifact of an SELinux hack
1585 * in the USB code. Someday it may go away.
1587 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1590 struct smk_audit_info ad;
1592 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1593 smk_ad_setfield_u_tsk(&ad, p);
1595 * Sending a signal requires that the sender
1596 * can write the receiver.
1599 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1602 * If the secid isn't 0 we're dealing with some USB IO
1603 * specific behavior. This is not clean. For one thing
1604 * we can't take privilege into account.
1606 return smk_access(smack_from_secid(secid),
1607 smk_of_task(task_security(p)), MAY_WRITE, &ad);
1611 * smack_task_wait - Smack access check for waiting
1612 * @p: task to wait for
1614 * Returns 0 if current can wait for p, error code otherwise
1616 static int smack_task_wait(struct task_struct *p)
1618 struct smk_audit_info ad;
1619 char *sp = smk_of_current();
1620 char *tsp = smk_of_forked(task_security(p));
1623 /* we don't log here, we can be overriden */
1624 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
1629 * Allow the operation to succeed if either task
1630 * has privilege to perform operations that might
1631 * account for the smack labels having gotten to
1632 * be different in the first place.
1634 * This breaks the strict subject/object access
1635 * control ideal, taking the object's privilege
1636 * state into account in the decision as well as
1639 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1641 /* we log only if we didn't get overriden */
1643 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1644 smk_ad_setfield_u_tsk(&ad, p);
1645 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
1650 * smack_task_to_inode - copy task smack into the inode blob
1651 * @p: task to copy from
1652 * @inode: inode to copy to
1654 * Sets the smack pointer in the inode security blob
1656 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1658 struct inode_smack *isp = inode->i_security;
1659 isp->smk_inode = smk_of_task(task_security(p));
1667 * smack_sk_alloc_security - Allocate a socket blob
1670 * @gfp_flags: memory allocation flags
1672 * Assign Smack pointers to current
1674 * Returns 0 on success, -ENOMEM is there's no memory
1676 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1678 char *csp = smk_of_current();
1679 struct socket_smack *ssp;
1681 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1687 ssp->smk_packet[0] = '\0';
1689 sk->sk_security = ssp;
1695 * smack_sk_free_security - Free a socket blob
1698 * Clears the blob pointer
1700 static void smack_sk_free_security(struct sock *sk)
1702 kfree(sk->sk_security);
1706 * smack_host_label - check host based restrictions
1707 * @sip: the object end
1709 * looks for host based access restrictions
1711 * This version will only be appropriate for really small sets of single label
1712 * hosts. The caller is responsible for ensuring that the RCU read lock is
1713 * taken before calling this function.
1715 * Returns the label of the far end or NULL if it's not special.
1717 static char *smack_host_label(struct sockaddr_in *sip)
1719 struct smk_netlbladdr *snp;
1720 struct in_addr *siap = &sip->sin_addr;
1722 if (siap->s_addr == 0)
1725 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1727 * we break after finding the first match because
1728 * the list is sorted from longest to shortest mask
1729 * so we have found the most specific match
1731 if ((&snp->smk_host.sin_addr)->s_addr ==
1732 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1733 /* we have found the special CIPSO option */
1734 if (snp->smk_label == smack_cipso_option)
1736 return snp->smk_label;
1743 * smack_set_catset - convert a capset to netlabel mls categories
1744 * @catset: the Smack categories
1745 * @sap: where to put the netlabel categories
1747 * Allocates and fills attr.mls.cat
1749 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1760 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1761 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1762 sap->attr.mls.cat->startbit = 0;
1764 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1765 for (m = 0x80; m != 0; m >>= 1, cat++) {
1768 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1774 * smack_to_secattr - fill a secattr from a smack value
1775 * @smack: the smack value
1776 * @nlsp: where the result goes
1778 * Casey says that CIPSO is good enough for now.
1779 * It can be used to effect.
1780 * It can also be abused to effect when necessary.
1781 * Appologies to the TSIG group in general and GW in particular.
1783 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1785 struct smack_cipso cipso;
1788 nlsp->domain = smack;
1789 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
1791 rc = smack_to_cipso(smack, &cipso);
1793 nlsp->attr.mls.lvl = cipso.smk_level;
1794 smack_set_catset(cipso.smk_catset, nlsp);
1796 nlsp->attr.mls.lvl = smack_cipso_direct;
1797 smack_set_catset(smack, nlsp);
1802 * smack_netlabel - Set the secattr on a socket
1804 * @labeled: socket label scheme
1806 * Convert the outbound smack value (smk_out) to a
1807 * secattr and attach it to the socket.
1809 * Returns 0 on success or an error code
1811 static int smack_netlabel(struct sock *sk, int labeled)
1813 struct socket_smack *ssp = sk->sk_security;
1814 struct netlbl_lsm_secattr secattr;
1818 * Usually the netlabel code will handle changing the
1819 * packet labeling based on the label.
1820 * The case of a single label host is different, because
1821 * a single label host should never get a labeled packet
1822 * even though the label is usually associated with a packet
1826 bh_lock_sock_nested(sk);
1828 if (ssp->smk_out == smack_net_ambient ||
1829 labeled == SMACK_UNLABELED_SOCKET)
1830 netlbl_sock_delattr(sk);
1832 netlbl_secattr_init(&secattr);
1833 smack_to_secattr(ssp->smk_out, &secattr);
1834 rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
1835 netlbl_secattr_destroy(&secattr);
1845 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1847 * @sap: the destination address
1849 * Set the correct secattr for the given socket based on the destination
1850 * address and perform any outbound access checks needed.
1852 * Returns 0 on success or an error code.
1855 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1860 struct socket_smack *ssp = sk->sk_security;
1861 struct smk_audit_info ad;
1864 hostsp = smack_host_label(sap);
1865 if (hostsp != NULL) {
1866 sk_lbl = SMACK_UNLABELED_SOCKET;
1868 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
1869 ad.a.u.net.family = sap->sin_family;
1870 ad.a.u.net.dport = sap->sin_port;
1871 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
1873 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1875 sk_lbl = SMACK_CIPSO_SOCKET;
1882 return smack_netlabel(sk, sk_lbl);
1886 * smack_inode_setsecurity - set smack xattrs
1887 * @inode: the object
1888 * @name: attribute name
1889 * @value: attribute value
1890 * @size: size of the attribute
1893 * Sets the named attribute in the appropriate blob
1895 * Returns 0 on success, or an error code
1897 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1898 const void *value, size_t size, int flags)
1901 struct inode_smack *nsp = inode->i_security;
1902 struct socket_smack *ssp;
1903 struct socket *sock;
1906 if (value == NULL || size > SMK_LABELLEN || size == 0)
1909 sp = smk_import(value, size);
1913 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1914 nsp->smk_inode = sp;
1915 nsp->smk_flags |= SMK_INODE_INSTANT;
1919 * The rest of the Smack xattrs are only on sockets.
1921 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1924 sock = SOCKET_I(inode);
1925 if (sock == NULL || sock->sk == NULL)
1928 ssp = sock->sk->sk_security;
1930 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1932 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1934 if (sock->sk->sk_family != PF_UNIX) {
1935 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1938 "Smack: \"%s\" netlbl error %d.\n",
1948 * smack_socket_post_create - finish socket setup
1950 * @family: protocol family
1955 * Sets the netlabel information on the socket
1957 * Returns 0 on success, and error code otherwise
1959 static int smack_socket_post_create(struct socket *sock, int family,
1960 int type, int protocol, int kern)
1962 if (family != PF_INET || sock->sk == NULL)
1965 * Set the outbound netlbl.
1967 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1971 * smack_socket_connect - connect access check
1973 * @sap: the other end
1974 * @addrlen: size of sap
1976 * Verifies that a connection may be possible
1978 * Returns 0 on success, and error code otherwise
1980 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
1983 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
1985 if (addrlen < sizeof(struct sockaddr_in))
1988 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
1992 * smack_flags_to_may - convert S_ to MAY_ values
1993 * @flags: the S_ value
1995 * Returns the equivalent MAY_ value
1997 static int smack_flags_to_may(int flags)
2001 if (flags & S_IRUGO)
2003 if (flags & S_IWUGO)
2005 if (flags & S_IXUGO)
2012 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2017 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2019 msg->security = smk_of_current();
2024 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2027 * Clears the blob pointer
2029 static void smack_msg_msg_free_security(struct msg_msg *msg)
2031 msg->security = NULL;
2035 * smack_of_shm - the smack pointer for the shm
2038 * Returns a pointer to the smack value
2040 static char *smack_of_shm(struct shmid_kernel *shp)
2042 return (char *)shp->shm_perm.security;
2046 * smack_shm_alloc_security - Set the security blob for shm
2051 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2053 struct kern_ipc_perm *isp = &shp->shm_perm;
2055 isp->security = smk_of_current();
2060 * smack_shm_free_security - Clear the security blob for shm
2063 * Clears the blob pointer
2065 static void smack_shm_free_security(struct shmid_kernel *shp)
2067 struct kern_ipc_perm *isp = &shp->shm_perm;
2069 isp->security = NULL;
2073 * smk_curacc_shm : check if current has access on shm
2075 * @access : access requested
2077 * Returns 0 if current has the requested access, error code otherwise
2079 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2081 char *ssp = smack_of_shm(shp);
2082 struct smk_audit_info ad;
2085 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2086 ad.a.u.ipc_id = shp->shm_perm.id;
2088 return smk_curacc(ssp, access, &ad);
2092 * smack_shm_associate - Smack access check for shm
2094 * @shmflg: access requested
2096 * Returns 0 if current has the requested access, error code otherwise
2098 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2102 may = smack_flags_to_may(shmflg);
2103 return smk_curacc_shm(shp, may);
2107 * smack_shm_shmctl - Smack access check for shm
2109 * @cmd: what it wants to do
2111 * Returns 0 if current has the requested access, error code otherwise
2113 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2126 may = MAY_READWRITE;
2131 * System level information.
2137 return smk_curacc_shm(shp, may);
2141 * smack_shm_shmat - Smack access for shmat
2144 * @shmflg: access requested
2146 * Returns 0 if current has the requested access, error code otherwise
2148 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2153 may = smack_flags_to_may(shmflg);
2154 return smk_curacc_shm(shp, may);
2158 * smack_of_sem - the smack pointer for the sem
2161 * Returns a pointer to the smack value
2163 static char *smack_of_sem(struct sem_array *sma)
2165 return (char *)sma->sem_perm.security;
2169 * smack_sem_alloc_security - Set the security blob for sem
2174 static int smack_sem_alloc_security(struct sem_array *sma)
2176 struct kern_ipc_perm *isp = &sma->sem_perm;
2178 isp->security = smk_of_current();
2183 * smack_sem_free_security - Clear the security blob for sem
2186 * Clears the blob pointer
2188 static void smack_sem_free_security(struct sem_array *sma)
2190 struct kern_ipc_perm *isp = &sma->sem_perm;
2192 isp->security = NULL;
2196 * smk_curacc_sem : check if current has access on sem
2198 * @access : access requested
2200 * Returns 0 if current has the requested access, error code otherwise
2202 static int smk_curacc_sem(struct sem_array *sma, int access)
2204 char *ssp = smack_of_sem(sma);
2205 struct smk_audit_info ad;
2208 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2209 ad.a.u.ipc_id = sma->sem_perm.id;
2211 return smk_curacc(ssp, access, &ad);
2215 * smack_sem_associate - Smack access check for sem
2217 * @semflg: access requested
2219 * Returns 0 if current has the requested access, error code otherwise
2221 static int smack_sem_associate(struct sem_array *sma, int semflg)
2225 may = smack_flags_to_may(semflg);
2226 return smk_curacc_sem(sma, may);
2230 * smack_sem_shmctl - Smack access check for sem
2232 * @cmd: what it wants to do
2234 * Returns 0 if current has the requested access, error code otherwise
2236 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2254 may = MAY_READWRITE;
2259 * System level information
2266 return smk_curacc_sem(sma, may);
2270 * smack_sem_semop - Smack checks of semaphore operations
2276 * Treated as read and write in all cases.
2278 * Returns 0 if access is allowed, error code otherwise
2280 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2281 unsigned nsops, int alter)
2283 return smk_curacc_sem(sma, MAY_READWRITE);
2287 * smack_msg_alloc_security - Set the security blob for msg
2292 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2294 struct kern_ipc_perm *kisp = &msq->q_perm;
2296 kisp->security = smk_of_current();
2301 * smack_msg_free_security - Clear the security blob for msg
2304 * Clears the blob pointer
2306 static void smack_msg_queue_free_security(struct msg_queue *msq)
2308 struct kern_ipc_perm *kisp = &msq->q_perm;
2310 kisp->security = NULL;
2314 * smack_of_msq - the smack pointer for the msq
2317 * Returns a pointer to the smack value
2319 static char *smack_of_msq(struct msg_queue *msq)
2321 return (char *)msq->q_perm.security;
2325 * smk_curacc_msq : helper to check if current has access on msq
2327 * @access : access requested
2329 * return 0 if current has access, error otherwise
2331 static int smk_curacc_msq(struct msg_queue *msq, int access)
2333 char *msp = smack_of_msq(msq);
2334 struct smk_audit_info ad;
2337 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2338 ad.a.u.ipc_id = msq->q_perm.id;
2340 return smk_curacc(msp, access, &ad);
2344 * smack_msg_queue_associate - Smack access check for msg_queue
2346 * @msqflg: access requested
2348 * Returns 0 if current has the requested access, error code otherwise
2350 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2354 may = smack_flags_to_may(msqflg);
2355 return smk_curacc_msq(msq, may);
2359 * smack_msg_queue_msgctl - Smack access check for msg_queue
2361 * @cmd: what it wants to do
2363 * Returns 0 if current has the requested access, error code otherwise
2365 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2376 may = MAY_READWRITE;
2381 * System level information
2388 return smk_curacc_msq(msq, may);
2392 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2395 * @msqflg: access requested
2397 * Returns 0 if current has the requested access, error code otherwise
2399 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2404 may = smack_flags_to_may(msqflg);
2405 return smk_curacc_msq(msq, may);
2409 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2416 * Returns 0 if current has read and write access, error code otherwise
2418 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2419 struct task_struct *target, long type, int mode)
2421 return smk_curacc_msq(msq, MAY_READWRITE);
2425 * smack_ipc_permission - Smack access for ipc_permission()
2426 * @ipp: the object permissions
2427 * @flag: access requested
2429 * Returns 0 if current has read and write access, error code otherwise
2431 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2433 char *isp = ipp->security;
2434 int may = smack_flags_to_may(flag);
2435 struct smk_audit_info ad;
2438 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2439 ad.a.u.ipc_id = ipp->id;
2441 return smk_curacc(isp, may, &ad);
2445 * smack_ipc_getsecid - Extract smack security id
2446 * @ipp: the object permissions
2447 * @secid: where result will be saved
2449 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2451 char *smack = ipp->security;
2453 *secid = smack_to_secid(smack);
2457 * smack_d_instantiate - Make sure the blob is correct on an inode
2458 * @opt_dentry: dentry where inode will be attached
2459 * @inode: the object
2461 * Set the inode's security blob if it hasn't been done already.
2463 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2465 struct super_block *sbp;
2466 struct superblock_smack *sbsp;
2467 struct inode_smack *isp;
2468 char *csp = smk_of_current();
2471 char trattr[TRANS_TRUE_SIZE];
2478 isp = inode->i_security;
2480 mutex_lock(&isp->smk_lock);
2482 * If the inode is already instantiated
2483 * take the quick way out
2485 if (isp->smk_flags & SMK_INODE_INSTANT)
2489 sbsp = sbp->s_security;
2491 * We're going to use the superblock default label
2492 * if there's no label on the file.
2494 final = sbsp->smk_default;
2497 * If this is the root inode the superblock
2498 * may be in the process of initialization.
2499 * If that is the case use the root value out
2500 * of the superblock.
2502 if (opt_dentry->d_parent == opt_dentry) {
2503 isp->smk_inode = sbsp->smk_root;
2504 isp->smk_flags |= SMK_INODE_INSTANT;
2509 * This is pretty hackish.
2510 * Casey says that we shouldn't have to do
2511 * file system specific code, but it does help
2512 * with keeping it simple.
2514 switch (sbp->s_magic) {
2517 * Casey says that it's a little embarassing
2518 * that the smack file system doesn't do
2519 * extended attributes.
2521 final = smack_known_star.smk_known;
2525 * Casey says pipes are easy (?)
2527 final = smack_known_star.smk_known;
2529 case DEVPTS_SUPER_MAGIC:
2531 * devpts seems content with the label of the task.
2532 * Programs that change smack have to treat the
2539 * Socket access is controlled by the socket
2540 * structures associated with the task involved.
2542 final = smack_known_star.smk_known;
2544 case PROC_SUPER_MAGIC:
2546 * Casey says procfs appears not to care.
2547 * The superblock default suffices.
2552 * Device labels should come from the filesystem,
2553 * but watch out, because they're volitile,
2554 * getting recreated on every reboot.
2556 final = smack_known_star.smk_known;
2560 * If a smack value has been set we want to use it,
2561 * but since tmpfs isn't giving us the opportunity
2562 * to set mount options simulate setting the
2563 * superblock default.
2567 * This isn't an understood special case.
2568 * Get the value from the xattr.
2572 * UNIX domain sockets use lower level socket data.
2574 if (S_ISSOCK(inode->i_mode)) {
2575 final = smack_known_star.smk_known;
2579 * No xattr support means, alas, no SMACK label.
2580 * Use the aforeapplied default.
2581 * It would be curious if the label of the task
2582 * does not match that assigned.
2584 if (inode->i_op->getxattr == NULL)
2587 * Get the dentry for xattr.
2589 dp = dget(opt_dentry);
2590 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2591 if (fetched != NULL) {
2593 if (S_ISDIR(inode->i_mode)) {
2595 inode->i_op->getxattr(dp,
2596 XATTR_NAME_SMACKTRANSMUTE,
2597 trattr, TRANS_TRUE_SIZE);
2598 if (strncmp(trattr, TRANS_TRUE,
2599 TRANS_TRUE_SIZE) == 0)
2600 transflag = SMK_INODE_TRANSMUTE;
2603 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2604 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2611 isp->smk_inode = csp;
2613 isp->smk_inode = final;
2615 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2618 mutex_unlock(&isp->smk_lock);
2623 * smack_getprocattr - Smack process attribute access
2624 * @p: the object task
2625 * @name: the name of the attribute in /proc/.../attr
2626 * @value: where to put the result
2628 * Places a copy of the task Smack into value
2630 * Returns the length of the smack label or an error code
2632 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2637 if (strcmp(name, "current") != 0)
2640 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2650 * smack_setprocattr - Smack process attribute setting
2651 * @p: the object task
2652 * @name: the name of the attribute in /proc/.../attr
2653 * @value: the value to set
2654 * @size: the size of the value
2656 * Sets the Smack value of the task. Only setting self
2657 * is permitted and only with privilege
2659 * Returns the length of the smack label or an error code
2661 static int smack_setprocattr(struct task_struct *p, char *name,
2662 void *value, size_t size)
2665 struct task_smack *tsp;
2666 struct task_smack *oldtsp;
2671 * Changing another process' Smack value is too dangerous
2672 * and supports no sane use case.
2677 if (!capable(CAP_MAC_ADMIN))
2680 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2683 if (strcmp(name, "current") != 0)
2686 newsmack = smk_import(value, size);
2687 if (newsmack == NULL)
2691 * No process is ever allowed the web ("@") label.
2693 if (newsmack == smack_known_web.smk_known)
2696 oldtsp = p->cred->security;
2697 new = prepare_creds();
2701 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
2706 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2710 new->security = tsp;
2716 * smack_unix_stream_connect - Smack access on UDS
2718 * @other: the other sock
2721 * Return 0 if a subject with the smack of sock could access
2722 * an object with the smack of other, otherwise an error code
2724 static int smack_unix_stream_connect(struct sock *sock,
2725 struct sock *other, struct sock *newsk)
2727 struct socket_smack *ssp = sock->sk_security;
2728 struct socket_smack *osp = other->sk_security;
2729 struct smk_audit_info ad;
2732 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2733 smk_ad_setfield_u_net_sk(&ad, other);
2735 if (!capable(CAP_MAC_OVERRIDE))
2736 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2742 * smack_unix_may_send - Smack access on UDS
2744 * @other: the other socket
2746 * Return 0 if a subject with the smack of sock could access
2747 * an object with the smack of other, otherwise an error code
2749 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2751 struct socket_smack *ssp = sock->sk->sk_security;
2752 struct socket_smack *osp = other->sk->sk_security;
2753 struct smk_audit_info ad;
2756 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2757 smk_ad_setfield_u_net_sk(&ad, other->sk);
2759 if (!capable(CAP_MAC_OVERRIDE))
2760 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2766 * smack_socket_sendmsg - Smack check based on destination host
2769 * @size: the size of the message
2771 * Return 0 if the current subject can write to the destination
2772 * host. This is only a question if the destination is a single
2775 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2778 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2781 * Perfectly reasonable for this to be NULL
2783 if (sip == NULL || sip->sin_family != AF_INET)
2786 return smack_netlabel_send(sock->sk, sip);
2791 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2792 * @sap: netlabel secattr
2793 * @sip: where to put the result
2795 * Copies a smack label into sip
2797 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2799 char smack[SMK_LABELLEN];
2803 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2805 * Looks like a CIPSO packet.
2806 * If there are flags but no level netlabel isn't
2807 * behaving the way we expect it to.
2809 * Get the categories, if any
2810 * Without guidance regarding the smack value
2811 * for the packet fall back on the network
2814 memset(smack, '\0', SMK_LABELLEN);
2815 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2817 pcat = netlbl_secattr_catmap_walk(
2818 sap->attr.mls.cat, pcat + 1);
2821 smack_catset_bit(pcat, smack);
2824 * If it is CIPSO using smack direct mapping
2825 * we are already done. WeeHee.
2827 if (sap->attr.mls.lvl == smack_cipso_direct) {
2828 memcpy(sip, smack, SMK_MAXLEN);
2832 * Look it up in the supplied table if it is not
2835 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2838 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2840 * Looks like a fallback, which gives us a secid.
2842 sp = smack_from_secid(sap->attr.secid);
2844 * This has got to be a bug because it is
2845 * impossible to specify a fallback without
2846 * specifying the label, which will ensure
2847 * it has a secid, and the only way to get a
2848 * secid is from a fallback.
2851 strncpy(sip, sp, SMK_MAXLEN);
2855 * Without guidance regarding the smack value
2856 * for the packet fall back on the network
2859 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2864 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2868 * Returns 0 if the packet should be delivered, an error code otherwise
2870 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2872 struct netlbl_lsm_secattr secattr;
2873 struct socket_smack *ssp = sk->sk_security;
2874 char smack[SMK_LABELLEN];
2877 struct smk_audit_info ad;
2878 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2882 * Translate what netlabel gave us.
2884 netlbl_secattr_init(&secattr);
2886 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2888 smack_from_secattr(&secattr, smack);
2891 csp = smack_net_ambient;
2893 netlbl_secattr_destroy(&secattr);
2896 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2897 ad.a.u.net.family = sk->sk_family;
2898 ad.a.u.net.netif = skb->skb_iif;
2899 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2902 * Receiving a packet requires that the other end
2903 * be able to write here. Read access is not required.
2904 * This is the simplist possible security model
2907 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2909 netlbl_skbuff_err(skb, rc, 0);
2914 * smack_socket_getpeersec_stream - pull in packet label
2916 * @optval: user's destination
2917 * @optlen: size thereof
2920 * returns zero on success, an error code otherwise
2922 static int smack_socket_getpeersec_stream(struct socket *sock,
2923 char __user *optval,
2924 int __user *optlen, unsigned len)
2926 struct socket_smack *ssp;
2930 ssp = sock->sk->sk_security;
2931 slen = strlen(ssp->smk_packet) + 1;
2935 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2938 if (put_user(slen, optlen) != 0)
2946 * smack_socket_getpeersec_dgram - pull in packet label
2947 * @sock: the peer socket
2949 * @secid: pointer to where to put the secid of the packet
2951 * Sets the netlabel socket state on sk from parent
2953 static int smack_socket_getpeersec_dgram(struct socket *sock,
2954 struct sk_buff *skb, u32 *secid)
2957 struct netlbl_lsm_secattr secattr;
2958 struct socket_smack *sp;
2959 char smack[SMK_LABELLEN];
2960 int family = PF_UNSPEC;
2961 u32 s = 0; /* 0 is the invalid secid */
2965 if (skb->protocol == htons(ETH_P_IP))
2967 else if (skb->protocol == htons(ETH_P_IPV6))
2970 if (family == PF_UNSPEC && sock != NULL)
2971 family = sock->sk->sk_family;
2973 if (family == PF_UNIX) {
2974 sp = sock->sk->sk_security;
2975 s = smack_to_secid(sp->smk_out);
2976 } else if (family == PF_INET || family == PF_INET6) {
2978 * Translate what netlabel gave us.
2980 netlbl_secattr_init(&secattr);
2981 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2983 smack_from_secattr(&secattr, smack);
2984 s = smack_to_secid(smack);
2986 netlbl_secattr_destroy(&secattr);
2995 * smack_sock_graft - Initialize a newly created socket with an existing sock
2997 * @parent: parent socket
2999 * Set the smk_{in,out} state of an existing sock based on the process that
3000 * is creating the new socket.
3002 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3004 struct socket_smack *ssp;
3007 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3010 ssp = sk->sk_security;
3011 ssp->smk_in = ssp->smk_out = smk_of_current();
3012 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3016 * smack_inet_conn_request - Smack access check on connect
3017 * @sk: socket involved
3021 * Returns 0 if a task with the packet label could write to
3022 * the socket, otherwise an error code
3024 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3025 struct request_sock *req)
3027 u16 family = sk->sk_family;
3028 struct socket_smack *ssp = sk->sk_security;
3029 struct netlbl_lsm_secattr secattr;
3030 struct sockaddr_in addr;
3032 char smack[SMK_LABELLEN];
3034 struct smk_audit_info ad;
3036 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3037 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3040 netlbl_secattr_init(&secattr);
3041 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3043 smack_from_secattr(&secattr, smack);
3045 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
3046 netlbl_secattr_destroy(&secattr);
3049 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3050 ad.a.u.net.family = family;
3051 ad.a.u.net.netif = skb->skb_iif;
3052 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3055 * Receiving a packet requires that the other end be able to write
3056 * here. Read access is not required.
3058 rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad);
3063 * Save the peer's label in the request_sock so we can later setup
3064 * smk_packet in the child socket so that SO_PEERCRED can report it.
3066 req->peer_secid = smack_to_secid(smack);
3069 * We need to decide if we want to label the incoming connection here
3070 * if we do we only need to label the request_sock and the stack will
3071 * propogate the wire-label to the sock when it is created.
3074 addr.sin_addr.s_addr = hdr->saddr;
3076 if (smack_host_label(&addr) == NULL) {
3078 netlbl_secattr_init(&secattr);
3079 smack_to_secattr(smack, &secattr);
3080 rc = netlbl_req_setattr(req, &secattr);
3081 netlbl_secattr_destroy(&secattr);
3084 netlbl_req_delattr(req);
3091 * smack_inet_csk_clone - Copy the connection information to the new socket
3092 * @sk: the new socket
3093 * @req: the connection's request_sock
3095 * Transfer the connection's peer label to the newly created socket.
3097 static void smack_inet_csk_clone(struct sock *sk,
3098 const struct request_sock *req)
3100 struct socket_smack *ssp = sk->sk_security;
3103 if (req->peer_secid != 0) {
3104 smack = smack_from_secid(req->peer_secid);
3105 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
3107 ssp->smk_packet[0] = '\0';
3111 * Key management security hooks
3113 * Casey has not tested key support very heavily.
3114 * The permission check is most likely too restrictive.
3115 * If you care about keys please have a look.
3120 * smack_key_alloc - Set the key security blob
3122 * @cred: the credentials to use
3125 * No allocation required
3129 static int smack_key_alloc(struct key *key, const struct cred *cred,
3130 unsigned long flags)
3132 key->security = smk_of_task(cred->security);
3137 * smack_key_free - Clear the key security blob
3140 * Clear the blob pointer
3142 static void smack_key_free(struct key *key)
3144 key->security = NULL;
3148 * smack_key_permission - Smack access on a key
3149 * @key_ref: gets to the object
3150 * @cred: the credentials to use
3153 * Return 0 if the task has read and write to the object,
3154 * an error code otherwise
3156 static int smack_key_permission(key_ref_t key_ref,
3157 const struct cred *cred, key_perm_t perm)
3160 struct smk_audit_info ad;
3161 char *tsp = smk_of_task(cred->security);
3163 keyp = key_ref_to_ptr(key_ref);
3167 * If the key hasn't been initialized give it access so that
3170 if (keyp->security == NULL)
3173 * This should not occur
3178 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3179 ad.a.u.key_struct.key = keyp->serial;
3180 ad.a.u.key_struct.key_desc = keyp->description;
3182 return smk_access(tsp, keyp->security,
3183 MAY_READWRITE, &ad);
3185 #endif /* CONFIG_KEYS */
3190 * Audit requires a unique representation of each Smack specific
3191 * rule. This unique representation is used to distinguish the
3192 * object to be audited from remaining kernel objects and also
3193 * works as a glue between the audit hooks.
3195 * Since repository entries are added but never deleted, we'll use
3196 * the smack_known label address related to the given audit rule as
3197 * the needed unique representation. This also better fits the smack
3198 * model where nearly everything is a label.
3203 * smack_audit_rule_init - Initialize a smack audit rule
3204 * @field: audit rule fields given from user-space (audit.h)
3205 * @op: required testing operator (=, !=, >, <, ...)
3206 * @rulestr: smack label to be audited
3207 * @vrule: pointer to save our own audit rule representation
3209 * Prepare to audit cases where (@field @op @rulestr) is true.
3210 * The label to be audited is created if necessay.
3212 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3214 char **rule = (char **)vrule;
3217 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3220 if (op != Audit_equal && op != Audit_not_equal)
3223 *rule = smk_import(rulestr, 0);
3229 * smack_audit_rule_known - Distinguish Smack audit rules
3230 * @krule: rule of interest, in Audit kernel representation format
3232 * This is used to filter Smack rules from remaining Audit ones.
3233 * If it's proved that this rule belongs to us, the
3234 * audit_rule_match hook will be called to do the final judgement.
3236 static int smack_audit_rule_known(struct audit_krule *krule)
3238 struct audit_field *f;
3241 for (i = 0; i < krule->field_count; i++) {
3242 f = &krule->fields[i];
3244 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3252 * smack_audit_rule_match - Audit given object ?
3253 * @secid: security id for identifying the object to test
3254 * @field: audit rule flags given from user-space
3255 * @op: required testing operator
3256 * @vrule: smack internal rule presentation
3257 * @actx: audit context associated with the check
3259 * The core Audit hook. It's used to take the decision of
3260 * whether to audit or not to audit a given object.
3262 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3263 struct audit_context *actx)
3269 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
3270 "Smack: missing rule\n");
3274 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3277 smack = smack_from_secid(secid);
3280 * No need to do string comparisons. If a match occurs,
3281 * both pointers will point to the same smack_known
3284 if (op == Audit_equal)
3285 return (rule == smack);
3286 if (op == Audit_not_equal)
3287 return (rule != smack);
3293 * smack_audit_rule_free - free smack rule representation
3294 * @vrule: rule to be freed.
3296 * No memory was allocated.
3298 static void smack_audit_rule_free(void *vrule)
3303 #endif /* CONFIG_AUDIT */
3306 * smack_secid_to_secctx - return the smack label for a secid
3307 * @secid: incoming integer
3308 * @secdata: destination
3309 * @seclen: how long it is
3311 * Exists for networking code.
3313 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3315 char *sp = smack_from_secid(secid);
3319 *seclen = strlen(sp);
3324 * smack_secctx_to_secid - return the secid for a smack label
3325 * @secdata: smack label
3326 * @seclen: how long result is
3327 * @secid: outgoing integer
3329 * Exists for audit and networking code.
3331 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3333 *secid = smack_to_secid(secdata);
3338 * smack_release_secctx - don't do anything.
3342 * Exists to make sure nothing gets done, and properly
3344 static void smack_release_secctx(char *secdata, u32 seclen)
3348 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3350 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3353 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3355 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3358 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3361 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3369 struct security_operations smack_ops = {
3372 .ptrace_access_check = smack_ptrace_access_check,
3373 .ptrace_traceme = smack_ptrace_traceme,
3374 .syslog = smack_syslog,
3376 .sb_alloc_security = smack_sb_alloc_security,
3377 .sb_free_security = smack_sb_free_security,
3378 .sb_copy_data = smack_sb_copy_data,
3379 .sb_kern_mount = smack_sb_kern_mount,
3380 .sb_statfs = smack_sb_statfs,
3381 .sb_mount = smack_sb_mount,
3382 .sb_umount = smack_sb_umount,
3384 .bprm_set_creds = smack_bprm_set_creds,
3386 .inode_alloc_security = smack_inode_alloc_security,
3387 .inode_free_security = smack_inode_free_security,
3388 .inode_init_security = smack_inode_init_security,
3389 .inode_link = smack_inode_link,
3390 .inode_unlink = smack_inode_unlink,
3391 .inode_rmdir = smack_inode_rmdir,
3392 .inode_rename = smack_inode_rename,
3393 .inode_permission = smack_inode_permission,
3394 .inode_setattr = smack_inode_setattr,
3395 .inode_getattr = smack_inode_getattr,
3396 .inode_setxattr = smack_inode_setxattr,
3397 .inode_post_setxattr = smack_inode_post_setxattr,
3398 .inode_getxattr = smack_inode_getxattr,
3399 .inode_removexattr = smack_inode_removexattr,
3400 .inode_getsecurity = smack_inode_getsecurity,
3401 .inode_setsecurity = smack_inode_setsecurity,
3402 .inode_listsecurity = smack_inode_listsecurity,
3403 .inode_getsecid = smack_inode_getsecid,
3405 .file_permission = smack_file_permission,
3406 .file_alloc_security = smack_file_alloc_security,
3407 .file_free_security = smack_file_free_security,
3408 .file_ioctl = smack_file_ioctl,
3409 .file_lock = smack_file_lock,
3410 .file_fcntl = smack_file_fcntl,
3411 .file_mmap = smack_file_mmap,
3412 .file_set_fowner = smack_file_set_fowner,
3413 .file_send_sigiotask = smack_file_send_sigiotask,
3414 .file_receive = smack_file_receive,
3416 .cred_alloc_blank = smack_cred_alloc_blank,
3417 .cred_free = smack_cred_free,
3418 .cred_prepare = smack_cred_prepare,
3419 .cred_transfer = smack_cred_transfer,
3420 .kernel_act_as = smack_kernel_act_as,
3421 .kernel_create_files_as = smack_kernel_create_files_as,
3422 .task_setpgid = smack_task_setpgid,
3423 .task_getpgid = smack_task_getpgid,
3424 .task_getsid = smack_task_getsid,
3425 .task_getsecid = smack_task_getsecid,
3426 .task_setnice = smack_task_setnice,
3427 .task_setioprio = smack_task_setioprio,
3428 .task_getioprio = smack_task_getioprio,
3429 .task_setscheduler = smack_task_setscheduler,
3430 .task_getscheduler = smack_task_getscheduler,
3431 .task_movememory = smack_task_movememory,
3432 .task_kill = smack_task_kill,
3433 .task_wait = smack_task_wait,
3434 .task_to_inode = smack_task_to_inode,
3436 .ipc_permission = smack_ipc_permission,
3437 .ipc_getsecid = smack_ipc_getsecid,
3439 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3440 .msg_msg_free_security = smack_msg_msg_free_security,
3442 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3443 .msg_queue_free_security = smack_msg_queue_free_security,
3444 .msg_queue_associate = smack_msg_queue_associate,
3445 .msg_queue_msgctl = smack_msg_queue_msgctl,
3446 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3447 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3449 .shm_alloc_security = smack_shm_alloc_security,
3450 .shm_free_security = smack_shm_free_security,
3451 .shm_associate = smack_shm_associate,
3452 .shm_shmctl = smack_shm_shmctl,
3453 .shm_shmat = smack_shm_shmat,
3455 .sem_alloc_security = smack_sem_alloc_security,
3456 .sem_free_security = smack_sem_free_security,
3457 .sem_associate = smack_sem_associate,
3458 .sem_semctl = smack_sem_semctl,
3459 .sem_semop = smack_sem_semop,
3461 .d_instantiate = smack_d_instantiate,
3463 .getprocattr = smack_getprocattr,
3464 .setprocattr = smack_setprocattr,
3466 .unix_stream_connect = smack_unix_stream_connect,
3467 .unix_may_send = smack_unix_may_send,
3469 .socket_post_create = smack_socket_post_create,
3470 .socket_connect = smack_socket_connect,
3471 .socket_sendmsg = smack_socket_sendmsg,
3472 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3473 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3474 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3475 .sk_alloc_security = smack_sk_alloc_security,
3476 .sk_free_security = smack_sk_free_security,
3477 .sock_graft = smack_sock_graft,
3478 .inet_conn_request = smack_inet_conn_request,
3479 .inet_csk_clone = smack_inet_csk_clone,
3481 /* key management security hooks */
3483 .key_alloc = smack_key_alloc,
3484 .key_free = smack_key_free,
3485 .key_permission = smack_key_permission,
3486 #endif /* CONFIG_KEYS */
3490 .audit_rule_init = smack_audit_rule_init,
3491 .audit_rule_known = smack_audit_rule_known,
3492 .audit_rule_match = smack_audit_rule_match,
3493 .audit_rule_free = smack_audit_rule_free,
3494 #endif /* CONFIG_AUDIT */
3496 .secid_to_secctx = smack_secid_to_secctx,
3497 .secctx_to_secid = smack_secctx_to_secid,
3498 .release_secctx = smack_release_secctx,
3499 .inode_notifysecctx = smack_inode_notifysecctx,
3500 .inode_setsecctx = smack_inode_setsecctx,
3501 .inode_getsecctx = smack_inode_getsecctx,
3505 static __init void init_smack_know_list(void)
3507 list_add(&smack_known_huh.list, &smack_known_list);
3508 list_add(&smack_known_hat.list, &smack_known_list);
3509 list_add(&smack_known_star.list, &smack_known_list);
3510 list_add(&smack_known_floor.list, &smack_known_list);
3511 list_add(&smack_known_invalid.list, &smack_known_list);
3512 list_add(&smack_known_web.list, &smack_known_list);
3516 * smack_init - initialize the smack system
3520 static __init int smack_init(void)
3523 struct task_smack *tsp;
3525 if (!security_module_enable(&smack_ops))
3528 tsp = new_task_smack(smack_known_floor.smk_known,
3529 smack_known_floor.smk_known, GFP_KERNEL);
3533 printk(KERN_INFO "Smack: Initializing.\n");
3536 * Set the security state for the initial task.
3538 cred = (struct cred *) current->cred;
3539 cred->security = tsp;
3541 /* initialize the smack_know_list */
3542 init_smack_know_list();
3546 spin_lock_init(&smack_known_huh.smk_cipsolock);
3547 spin_lock_init(&smack_known_hat.smk_cipsolock);
3548 spin_lock_init(&smack_known_star.smk_cipsolock);
3549 spin_lock_init(&smack_known_floor.smk_cipsolock);
3550 spin_lock_init(&smack_known_invalid.smk_cipsolock);
3555 if (register_security(&smack_ops))
3556 panic("smack: Unable to register with kernel.\n");
3562 * Smack requires early initialization in order to label
3563 * all processes and objects when they are created.
3565 security_initcall(smack_init);