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);
1114 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1115 * if mapping anonymous memory.
1116 * @file contains the file structure for file to map (may be NULL).
1117 * @reqprot contains the protection requested by the application.
1118 * @prot contains the protection that will be applied by the kernel.
1119 * @flags contains the operational flags.
1120 * Return 0 if permission is granted.
1122 static int smack_file_mmap(struct file *file,
1123 unsigned long reqprot, unsigned long prot,
1124 unsigned long flags, unsigned long addr,
1125 unsigned long addr_only)
1127 struct smack_rule *srp;
1128 struct task_smack *tsp;
1132 struct inode_smack *isp;
1139 /* do DAC check on address space usage */
1140 rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
1141 if (rc || addr_only)
1144 if (file == NULL || file->f_dentry == NULL)
1147 dp = file->f_dentry;
1149 if (dp->d_inode == NULL)
1152 isp = dp->d_inode->i_security;
1153 if (isp->smk_mmap == NULL)
1155 msmack = isp->smk_mmap;
1157 tsp = current_security();
1158 sp = smk_of_current();
1163 * For each Smack rule associated with the subject
1164 * label verify that the SMACK64MMAP also has access
1165 * to that rule's object label.
1167 * Because neither of the labels comes
1168 * from the networking code it is sufficient
1169 * to compare pointers.
1171 list_for_each_entry_rcu(srp, &smack_rule_list, list) {
1172 if (srp->smk_subject != sp)
1175 osmack = srp->smk_object;
1177 * Matching labels always allows access.
1179 if (msmack == osmack)
1182 * If there is a matching local rule take
1183 * that into account as well.
1185 may = smk_access_entry(srp->smk_subject, osmack,
1188 may = srp->smk_access;
1190 may &= srp->smk_access;
1192 * If may is zero the SMACK64MMAP subject can't
1193 * possibly have less access.
1199 * Fetch the global list entry.
1200 * If there isn't one a SMACK64MMAP subject
1201 * can't have as much access as current.
1203 mmay = smk_access_entry(msmack, osmack, &smack_rule_list);
1204 if (mmay == -ENOENT) {
1209 * If there is a local entry it modifies the
1210 * potential access, too.
1212 tmay = smk_access_entry(msmack, osmack, &tsp->smk_rules);
1213 if (tmay != -ENOENT)
1217 * If there is any access available to current that is
1218 * not available to a SMACK64MMAP subject
1221 if ((may | mmay) != may) {
1233 * smack_file_set_fowner - set the file security blob value
1234 * @file: object in question
1237 * Further research may be required on this one.
1239 static int smack_file_set_fowner(struct file *file)
1241 file->f_security = smk_of_current();
1246 * smack_file_send_sigiotask - Smack on sigio
1247 * @tsk: The target task
1248 * @fown: the object the signal come from
1251 * Allow a privileged task to get signals even if it shouldn't
1253 * Returns 0 if a subject with the object's smack could
1254 * write to the task, an error code otherwise.
1256 static int smack_file_send_sigiotask(struct task_struct *tsk,
1257 struct fown_struct *fown, int signum)
1261 char *tsp = smk_of_task(tsk->cred->security);
1262 struct smk_audit_info ad;
1265 * struct fown_struct is never outside the context of a struct file
1267 file = container_of(fown, struct file, f_owner);
1269 /* we don't log here as rc can be overriden */
1270 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
1271 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1274 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1275 smk_ad_setfield_u_tsk(&ad, tsk);
1276 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
1281 * smack_file_receive - Smack file receive check
1284 * Returns 0 if current has access, error code otherwise
1286 static int smack_file_receive(struct file *file)
1289 struct smk_audit_info ad;
1291 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1292 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1294 * This code relies on bitmasks.
1296 if (file->f_mode & FMODE_READ)
1298 if (file->f_mode & FMODE_WRITE)
1301 return smk_curacc(file->f_security, may, &ad);
1309 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1310 * @new: the new credentials
1311 * @gfp: the atomicity of any memory allocations
1313 * Prepare a blank set of credentials for modification. This must allocate all
1314 * the memory the LSM module might require such that cred_transfer() can
1315 * complete without error.
1317 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1319 struct task_smack *tsp;
1321 tsp = new_task_smack(NULL, NULL, gfp);
1325 cred->security = tsp;
1332 * smack_cred_free - "free" task-level security credentials
1333 * @cred: the credentials in question
1336 static void smack_cred_free(struct cred *cred)
1338 struct task_smack *tsp = cred->security;
1339 struct smack_rule *rp;
1340 struct list_head *l;
1341 struct list_head *n;
1345 cred->security = NULL;
1347 list_for_each_safe(l, n, &tsp->smk_rules) {
1348 rp = list_entry(l, struct smack_rule, list);
1349 list_del(&rp->list);
1356 * smack_cred_prepare - prepare new set of credentials for modification
1357 * @new: the new credentials
1358 * @old: the original credentials
1359 * @gfp: the atomicity of any memory allocations
1361 * Prepare a new set of credentials for modification.
1363 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1366 struct task_smack *old_tsp = old->security;
1367 struct task_smack *new_tsp;
1370 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1371 if (new_tsp == NULL)
1374 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1378 new->security = new_tsp;
1383 * smack_cred_transfer - Transfer the old credentials to the new credentials
1384 * @new: the new credentials
1385 * @old: the original credentials
1387 * Fill in a set of blank credentials from another set of credentials.
1389 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1391 struct task_smack *old_tsp = old->security;
1392 struct task_smack *new_tsp = new->security;
1394 new_tsp->smk_task = old_tsp->smk_task;
1395 new_tsp->smk_forked = old_tsp->smk_task;
1396 mutex_init(&new_tsp->smk_rules_lock);
1397 INIT_LIST_HEAD(&new_tsp->smk_rules);
1400 /* cbs copy rule list */
1404 * smack_kernel_act_as - Set the subjective context in a set of credentials
1405 * @new: points to the set of credentials to be modified.
1406 * @secid: specifies the security ID to be set
1408 * Set the security data for a kernel service.
1410 static int smack_kernel_act_as(struct cred *new, u32 secid)
1412 struct task_smack *new_tsp = new->security;
1413 char *smack = smack_from_secid(secid);
1418 new_tsp->smk_task = smack;
1423 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1424 * @new: points to the set of credentials to be modified
1425 * @inode: points to the inode to use as a reference
1427 * Set the file creation context in a set of credentials to the same
1428 * as the objective context of the specified inode
1430 static int smack_kernel_create_files_as(struct cred *new,
1431 struct inode *inode)
1433 struct inode_smack *isp = inode->i_security;
1434 struct task_smack *tsp = new->security;
1436 tsp->smk_forked = isp->smk_inode;
1437 tsp->smk_task = isp->smk_inode;
1442 * smk_curacc_on_task - helper to log task related access
1443 * @p: the task object
1444 * @access : the access requested
1446 * Return 0 if access is permitted
1448 static int smk_curacc_on_task(struct task_struct *p, int access)
1450 struct smk_audit_info ad;
1452 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1453 smk_ad_setfield_u_tsk(&ad, p);
1454 return smk_curacc(smk_of_task(task_security(p)), access, &ad);
1458 * smack_task_setpgid - Smack check on setting pgid
1459 * @p: the task object
1462 * Return 0 if write access is permitted
1464 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1466 return smk_curacc_on_task(p, MAY_WRITE);
1470 * smack_task_getpgid - Smack access check for getpgid
1471 * @p: the object task
1473 * Returns 0 if current can read the object task, error code otherwise
1475 static int smack_task_getpgid(struct task_struct *p)
1477 return smk_curacc_on_task(p, MAY_READ);
1481 * smack_task_getsid - Smack access check for getsid
1482 * @p: the object task
1484 * Returns 0 if current can read the object task, error code otherwise
1486 static int smack_task_getsid(struct task_struct *p)
1488 return smk_curacc_on_task(p, MAY_READ);
1492 * smack_task_getsecid - get the secid of the task
1493 * @p: the object task
1494 * @secid: where to put the result
1496 * Sets the secid to contain a u32 version of the smack label.
1498 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1500 *secid = smack_to_secid(smk_of_task(task_security(p)));
1504 * smack_task_setnice - Smack check on setting nice
1505 * @p: the task object
1508 * Return 0 if write access is permitted
1510 static int smack_task_setnice(struct task_struct *p, int nice)
1514 rc = cap_task_setnice(p, nice);
1516 rc = smk_curacc_on_task(p, MAY_WRITE);
1521 * smack_task_setioprio - Smack check on setting ioprio
1522 * @p: the task object
1525 * Return 0 if write access is permitted
1527 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1531 rc = cap_task_setioprio(p, ioprio);
1533 rc = smk_curacc_on_task(p, MAY_WRITE);
1538 * smack_task_getioprio - Smack check on reading ioprio
1539 * @p: the task object
1541 * Return 0 if read access is permitted
1543 static int smack_task_getioprio(struct task_struct *p)
1545 return smk_curacc_on_task(p, MAY_READ);
1549 * smack_task_setscheduler - Smack check on setting scheduler
1550 * @p: the task object
1554 * Return 0 if read access is permitted
1556 static int smack_task_setscheduler(struct task_struct *p)
1560 rc = cap_task_setscheduler(p);
1562 rc = smk_curacc_on_task(p, MAY_WRITE);
1567 * smack_task_getscheduler - Smack check on reading scheduler
1568 * @p: the task object
1570 * Return 0 if read access is permitted
1572 static int smack_task_getscheduler(struct task_struct *p)
1574 return smk_curacc_on_task(p, MAY_READ);
1578 * smack_task_movememory - Smack check on moving memory
1579 * @p: the task object
1581 * Return 0 if write access is permitted
1583 static int smack_task_movememory(struct task_struct *p)
1585 return smk_curacc_on_task(p, MAY_WRITE);
1589 * smack_task_kill - Smack check on signal delivery
1590 * @p: the task object
1593 * @secid: identifies the smack to use in lieu of current's
1595 * Return 0 if write access is permitted
1597 * The secid behavior is an artifact of an SELinux hack
1598 * in the USB code. Someday it may go away.
1600 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1603 struct smk_audit_info ad;
1605 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1606 smk_ad_setfield_u_tsk(&ad, p);
1608 * Sending a signal requires that the sender
1609 * can write the receiver.
1612 return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
1615 * If the secid isn't 0 we're dealing with some USB IO
1616 * specific behavior. This is not clean. For one thing
1617 * we can't take privilege into account.
1619 return smk_access(smack_from_secid(secid),
1620 smk_of_task(task_security(p)), MAY_WRITE, &ad);
1624 * smack_task_wait - Smack access check for waiting
1625 * @p: task to wait for
1627 * Returns 0 if current can wait for p, error code otherwise
1629 static int smack_task_wait(struct task_struct *p)
1631 struct smk_audit_info ad;
1632 char *sp = smk_of_current();
1633 char *tsp = smk_of_forked(task_security(p));
1636 /* we don't log here, we can be overriden */
1637 rc = smk_access(tsp, sp, MAY_WRITE, NULL);
1642 * Allow the operation to succeed if either task
1643 * has privilege to perform operations that might
1644 * account for the smack labels having gotten to
1645 * be different in the first place.
1647 * This breaks the strict subject/object access
1648 * control ideal, taking the object's privilege
1649 * state into account in the decision as well as
1652 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1654 /* we log only if we didn't get overriden */
1656 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1657 smk_ad_setfield_u_tsk(&ad, p);
1658 smack_log(tsp, sp, MAY_WRITE, rc, &ad);
1663 * smack_task_to_inode - copy task smack into the inode blob
1664 * @p: task to copy from
1665 * @inode: inode to copy to
1667 * Sets the smack pointer in the inode security blob
1669 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1671 struct inode_smack *isp = inode->i_security;
1672 isp->smk_inode = smk_of_task(task_security(p));
1680 * smack_sk_alloc_security - Allocate a socket blob
1683 * @gfp_flags: memory allocation flags
1685 * Assign Smack pointers to current
1687 * Returns 0 on success, -ENOMEM is there's no memory
1689 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1691 char *csp = smk_of_current();
1692 struct socket_smack *ssp;
1694 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1700 ssp->smk_packet[0] = '\0';
1702 sk->sk_security = ssp;
1708 * smack_sk_free_security - Free a socket blob
1711 * Clears the blob pointer
1713 static void smack_sk_free_security(struct sock *sk)
1715 kfree(sk->sk_security);
1719 * smack_host_label - check host based restrictions
1720 * @sip: the object end
1722 * looks for host based access restrictions
1724 * This version will only be appropriate for really small sets of single label
1725 * hosts. The caller is responsible for ensuring that the RCU read lock is
1726 * taken before calling this function.
1728 * Returns the label of the far end or NULL if it's not special.
1730 static char *smack_host_label(struct sockaddr_in *sip)
1732 struct smk_netlbladdr *snp;
1733 struct in_addr *siap = &sip->sin_addr;
1735 if (siap->s_addr == 0)
1738 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1740 * we break after finding the first match because
1741 * the list is sorted from longest to shortest mask
1742 * so we have found the most specific match
1744 if ((&snp->smk_host.sin_addr)->s_addr ==
1745 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1746 /* we have found the special CIPSO option */
1747 if (snp->smk_label == smack_cipso_option)
1749 return snp->smk_label;
1756 * smack_set_catset - convert a capset to netlabel mls categories
1757 * @catset: the Smack categories
1758 * @sap: where to put the netlabel categories
1760 * Allocates and fills attr.mls.cat
1762 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1773 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1774 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1775 sap->attr.mls.cat->startbit = 0;
1777 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1778 for (m = 0x80; m != 0; m >>= 1, cat++) {
1781 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1787 * smack_to_secattr - fill a secattr from a smack value
1788 * @smack: the smack value
1789 * @nlsp: where the result goes
1791 * Casey says that CIPSO is good enough for now.
1792 * It can be used to effect.
1793 * It can also be abused to effect when necessary.
1794 * Appologies to the TSIG group in general and GW in particular.
1796 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1798 struct smack_cipso cipso;
1801 nlsp->domain = smack;
1802 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
1804 rc = smack_to_cipso(smack, &cipso);
1806 nlsp->attr.mls.lvl = cipso.smk_level;
1807 smack_set_catset(cipso.smk_catset, nlsp);
1809 nlsp->attr.mls.lvl = smack_cipso_direct;
1810 smack_set_catset(smack, nlsp);
1815 * smack_netlabel - Set the secattr on a socket
1817 * @labeled: socket label scheme
1819 * Convert the outbound smack value (smk_out) to a
1820 * secattr and attach it to the socket.
1822 * Returns 0 on success or an error code
1824 static int smack_netlabel(struct sock *sk, int labeled)
1826 struct socket_smack *ssp = sk->sk_security;
1827 struct netlbl_lsm_secattr secattr;
1831 * Usually the netlabel code will handle changing the
1832 * packet labeling based on the label.
1833 * The case of a single label host is different, because
1834 * a single label host should never get a labeled packet
1835 * even though the label is usually associated with a packet
1839 bh_lock_sock_nested(sk);
1841 if (ssp->smk_out == smack_net_ambient ||
1842 labeled == SMACK_UNLABELED_SOCKET)
1843 netlbl_sock_delattr(sk);
1845 netlbl_secattr_init(&secattr);
1846 smack_to_secattr(ssp->smk_out, &secattr);
1847 rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr);
1848 netlbl_secattr_destroy(&secattr);
1858 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1860 * @sap: the destination address
1862 * Set the correct secattr for the given socket based on the destination
1863 * address and perform any outbound access checks needed.
1865 * Returns 0 on success or an error code.
1868 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1873 struct socket_smack *ssp = sk->sk_security;
1874 struct smk_audit_info ad;
1877 hostsp = smack_host_label(sap);
1878 if (hostsp != NULL) {
1879 sk_lbl = SMACK_UNLABELED_SOCKET;
1881 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
1882 ad.a.u.net.family = sap->sin_family;
1883 ad.a.u.net.dport = sap->sin_port;
1884 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr;
1886 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad);
1888 sk_lbl = SMACK_CIPSO_SOCKET;
1895 return smack_netlabel(sk, sk_lbl);
1899 * smack_inode_setsecurity - set smack xattrs
1900 * @inode: the object
1901 * @name: attribute name
1902 * @value: attribute value
1903 * @size: size of the attribute
1906 * Sets the named attribute in the appropriate blob
1908 * Returns 0 on success, or an error code
1910 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1911 const void *value, size_t size, int flags)
1914 struct inode_smack *nsp = inode->i_security;
1915 struct socket_smack *ssp;
1916 struct socket *sock;
1919 if (value == NULL || size > SMK_LABELLEN || size == 0)
1922 sp = smk_import(value, size);
1926 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1927 nsp->smk_inode = sp;
1928 nsp->smk_flags |= SMK_INODE_INSTANT;
1932 * The rest of the Smack xattrs are only on sockets.
1934 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1937 sock = SOCKET_I(inode);
1938 if (sock == NULL || sock->sk == NULL)
1941 ssp = sock->sk->sk_security;
1943 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1945 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1947 if (sock->sk->sk_family != PF_UNIX) {
1948 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1951 "Smack: \"%s\" netlbl error %d.\n",
1961 * smack_socket_post_create - finish socket setup
1963 * @family: protocol family
1968 * Sets the netlabel information on the socket
1970 * Returns 0 on success, and error code otherwise
1972 static int smack_socket_post_create(struct socket *sock, int family,
1973 int type, int protocol, int kern)
1975 if (family != PF_INET || sock->sk == NULL)
1978 * Set the outbound netlbl.
1980 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
1984 * smack_socket_connect - connect access check
1986 * @sap: the other end
1987 * @addrlen: size of sap
1989 * Verifies that a connection may be possible
1991 * Returns 0 on success, and error code otherwise
1993 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
1996 if (sock->sk == NULL || sock->sk->sk_family != PF_INET)
1998 if (addrlen < sizeof(struct sockaddr_in))
2001 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2005 * smack_flags_to_may - convert S_ to MAY_ values
2006 * @flags: the S_ value
2008 * Returns the equivalent MAY_ value
2010 static int smack_flags_to_may(int flags)
2014 if (flags & S_IRUGO)
2016 if (flags & S_IWUGO)
2018 if (flags & S_IXUGO)
2025 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2030 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2032 msg->security = smk_of_current();
2037 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2040 * Clears the blob pointer
2042 static void smack_msg_msg_free_security(struct msg_msg *msg)
2044 msg->security = NULL;
2048 * smack_of_shm - the smack pointer for the shm
2051 * Returns a pointer to the smack value
2053 static char *smack_of_shm(struct shmid_kernel *shp)
2055 return (char *)shp->shm_perm.security;
2059 * smack_shm_alloc_security - Set the security blob for shm
2064 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2066 struct kern_ipc_perm *isp = &shp->shm_perm;
2068 isp->security = smk_of_current();
2073 * smack_shm_free_security - Clear the security blob for shm
2076 * Clears the blob pointer
2078 static void smack_shm_free_security(struct shmid_kernel *shp)
2080 struct kern_ipc_perm *isp = &shp->shm_perm;
2082 isp->security = NULL;
2086 * smk_curacc_shm : check if current has access on shm
2088 * @access : access requested
2090 * Returns 0 if current has the requested access, error code otherwise
2092 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2094 char *ssp = smack_of_shm(shp);
2095 struct smk_audit_info ad;
2098 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2099 ad.a.u.ipc_id = shp->shm_perm.id;
2101 return smk_curacc(ssp, access, &ad);
2105 * smack_shm_associate - Smack access check for shm
2107 * @shmflg: access requested
2109 * Returns 0 if current has the requested access, error code otherwise
2111 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2115 may = smack_flags_to_may(shmflg);
2116 return smk_curacc_shm(shp, may);
2120 * smack_shm_shmctl - Smack access check for shm
2122 * @cmd: what it wants to do
2124 * Returns 0 if current has the requested access, error code otherwise
2126 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2139 may = MAY_READWRITE;
2144 * System level information.
2150 return smk_curacc_shm(shp, may);
2154 * smack_shm_shmat - Smack access for shmat
2157 * @shmflg: access requested
2159 * Returns 0 if current has the requested access, error code otherwise
2161 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2166 may = smack_flags_to_may(shmflg);
2167 return smk_curacc_shm(shp, may);
2171 * smack_of_sem - the smack pointer for the sem
2174 * Returns a pointer to the smack value
2176 static char *smack_of_sem(struct sem_array *sma)
2178 return (char *)sma->sem_perm.security;
2182 * smack_sem_alloc_security - Set the security blob for sem
2187 static int smack_sem_alloc_security(struct sem_array *sma)
2189 struct kern_ipc_perm *isp = &sma->sem_perm;
2191 isp->security = smk_of_current();
2196 * smack_sem_free_security - Clear the security blob for sem
2199 * Clears the blob pointer
2201 static void smack_sem_free_security(struct sem_array *sma)
2203 struct kern_ipc_perm *isp = &sma->sem_perm;
2205 isp->security = NULL;
2209 * smk_curacc_sem : check if current has access on sem
2211 * @access : access requested
2213 * Returns 0 if current has the requested access, error code otherwise
2215 static int smk_curacc_sem(struct sem_array *sma, int access)
2217 char *ssp = smack_of_sem(sma);
2218 struct smk_audit_info ad;
2221 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2222 ad.a.u.ipc_id = sma->sem_perm.id;
2224 return smk_curacc(ssp, access, &ad);
2228 * smack_sem_associate - Smack access check for sem
2230 * @semflg: access requested
2232 * Returns 0 if current has the requested access, error code otherwise
2234 static int smack_sem_associate(struct sem_array *sma, int semflg)
2238 may = smack_flags_to_may(semflg);
2239 return smk_curacc_sem(sma, may);
2243 * smack_sem_shmctl - Smack access check for sem
2245 * @cmd: what it wants to do
2247 * Returns 0 if current has the requested access, error code otherwise
2249 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2267 may = MAY_READWRITE;
2272 * System level information
2279 return smk_curacc_sem(sma, may);
2283 * smack_sem_semop - Smack checks of semaphore operations
2289 * Treated as read and write in all cases.
2291 * Returns 0 if access is allowed, error code otherwise
2293 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2294 unsigned nsops, int alter)
2296 return smk_curacc_sem(sma, MAY_READWRITE);
2300 * smack_msg_alloc_security - Set the security blob for msg
2305 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2307 struct kern_ipc_perm *kisp = &msq->q_perm;
2309 kisp->security = smk_of_current();
2314 * smack_msg_free_security - Clear the security blob for msg
2317 * Clears the blob pointer
2319 static void smack_msg_queue_free_security(struct msg_queue *msq)
2321 struct kern_ipc_perm *kisp = &msq->q_perm;
2323 kisp->security = NULL;
2327 * smack_of_msq - the smack pointer for the msq
2330 * Returns a pointer to the smack value
2332 static char *smack_of_msq(struct msg_queue *msq)
2334 return (char *)msq->q_perm.security;
2338 * smk_curacc_msq : helper to check if current has access on msq
2340 * @access : access requested
2342 * return 0 if current has access, error otherwise
2344 static int smk_curacc_msq(struct msg_queue *msq, int access)
2346 char *msp = smack_of_msq(msq);
2347 struct smk_audit_info ad;
2350 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2351 ad.a.u.ipc_id = msq->q_perm.id;
2353 return smk_curacc(msp, access, &ad);
2357 * smack_msg_queue_associate - Smack access check for msg_queue
2359 * @msqflg: access requested
2361 * Returns 0 if current has the requested access, error code otherwise
2363 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2367 may = smack_flags_to_may(msqflg);
2368 return smk_curacc_msq(msq, may);
2372 * smack_msg_queue_msgctl - Smack access check for msg_queue
2374 * @cmd: what it wants to do
2376 * Returns 0 if current has the requested access, error code otherwise
2378 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2389 may = MAY_READWRITE;
2394 * System level information
2401 return smk_curacc_msq(msq, may);
2405 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2408 * @msqflg: access requested
2410 * Returns 0 if current has the requested access, error code otherwise
2412 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2417 may = smack_flags_to_may(msqflg);
2418 return smk_curacc_msq(msq, may);
2422 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2429 * Returns 0 if current has read and write access, error code otherwise
2431 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2432 struct task_struct *target, long type, int mode)
2434 return smk_curacc_msq(msq, MAY_READWRITE);
2438 * smack_ipc_permission - Smack access for ipc_permission()
2439 * @ipp: the object permissions
2440 * @flag: access requested
2442 * Returns 0 if current has read and write access, error code otherwise
2444 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2446 char *isp = ipp->security;
2447 int may = smack_flags_to_may(flag);
2448 struct smk_audit_info ad;
2451 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2452 ad.a.u.ipc_id = ipp->id;
2454 return smk_curacc(isp, may, &ad);
2458 * smack_ipc_getsecid - Extract smack security id
2459 * @ipp: the object permissions
2460 * @secid: where result will be saved
2462 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2464 char *smack = ipp->security;
2466 *secid = smack_to_secid(smack);
2470 * smack_d_instantiate - Make sure the blob is correct on an inode
2471 * @opt_dentry: dentry where inode will be attached
2472 * @inode: the object
2474 * Set the inode's security blob if it hasn't been done already.
2476 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2478 struct super_block *sbp;
2479 struct superblock_smack *sbsp;
2480 struct inode_smack *isp;
2481 char *csp = smk_of_current();
2484 char trattr[TRANS_TRUE_SIZE];
2491 isp = inode->i_security;
2493 mutex_lock(&isp->smk_lock);
2495 * If the inode is already instantiated
2496 * take the quick way out
2498 if (isp->smk_flags & SMK_INODE_INSTANT)
2502 sbsp = sbp->s_security;
2504 * We're going to use the superblock default label
2505 * if there's no label on the file.
2507 final = sbsp->smk_default;
2510 * If this is the root inode the superblock
2511 * may be in the process of initialization.
2512 * If that is the case use the root value out
2513 * of the superblock.
2515 if (opt_dentry->d_parent == opt_dentry) {
2516 isp->smk_inode = sbsp->smk_root;
2517 isp->smk_flags |= SMK_INODE_INSTANT;
2522 * This is pretty hackish.
2523 * Casey says that we shouldn't have to do
2524 * file system specific code, but it does help
2525 * with keeping it simple.
2527 switch (sbp->s_magic) {
2530 * Casey says that it's a little embarassing
2531 * that the smack file system doesn't do
2532 * extended attributes.
2534 final = smack_known_star.smk_known;
2538 * Casey says pipes are easy (?)
2540 final = smack_known_star.smk_known;
2542 case DEVPTS_SUPER_MAGIC:
2544 * devpts seems content with the label of the task.
2545 * Programs that change smack have to treat the
2552 * Socket access is controlled by the socket
2553 * structures associated with the task involved.
2555 final = smack_known_star.smk_known;
2557 case PROC_SUPER_MAGIC:
2559 * Casey says procfs appears not to care.
2560 * The superblock default suffices.
2565 * Device labels should come from the filesystem,
2566 * but watch out, because they're volitile,
2567 * getting recreated on every reboot.
2569 final = smack_known_star.smk_known;
2573 * If a smack value has been set we want to use it,
2574 * but since tmpfs isn't giving us the opportunity
2575 * to set mount options simulate setting the
2576 * superblock default.
2580 * This isn't an understood special case.
2581 * Get the value from the xattr.
2585 * UNIX domain sockets use lower level socket data.
2587 if (S_ISSOCK(inode->i_mode)) {
2588 final = smack_known_star.smk_known;
2592 * No xattr support means, alas, no SMACK label.
2593 * Use the aforeapplied default.
2594 * It would be curious if the label of the task
2595 * does not match that assigned.
2597 if (inode->i_op->getxattr == NULL)
2600 * Get the dentry for xattr.
2602 dp = dget(opt_dentry);
2603 fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2604 if (fetched != NULL) {
2606 if (S_ISDIR(inode->i_mode)) {
2608 inode->i_op->getxattr(dp,
2609 XATTR_NAME_SMACKTRANSMUTE,
2610 trattr, TRANS_TRUE_SIZE);
2611 if (strncmp(trattr, TRANS_TRUE,
2612 TRANS_TRUE_SIZE) == 0)
2613 transflag = SMK_INODE_TRANSMUTE;
2616 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2617 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2624 isp->smk_inode = csp;
2626 isp->smk_inode = final;
2628 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2631 mutex_unlock(&isp->smk_lock);
2636 * smack_getprocattr - Smack process attribute access
2637 * @p: the object task
2638 * @name: the name of the attribute in /proc/.../attr
2639 * @value: where to put the result
2641 * Places a copy of the task Smack into value
2643 * Returns the length of the smack label or an error code
2645 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2650 if (strcmp(name, "current") != 0)
2653 cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
2663 * smack_setprocattr - Smack process attribute setting
2664 * @p: the object task
2665 * @name: the name of the attribute in /proc/.../attr
2666 * @value: the value to set
2667 * @size: the size of the value
2669 * Sets the Smack value of the task. Only setting self
2670 * is permitted and only with privilege
2672 * Returns the length of the smack label or an error code
2674 static int smack_setprocattr(struct task_struct *p, char *name,
2675 void *value, size_t size)
2678 struct task_smack *tsp;
2679 struct task_smack *oldtsp;
2684 * Changing another process' Smack value is too dangerous
2685 * and supports no sane use case.
2690 if (!capable(CAP_MAC_ADMIN))
2693 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2696 if (strcmp(name, "current") != 0)
2699 newsmack = smk_import(value, size);
2700 if (newsmack == NULL)
2704 * No process is ever allowed the web ("@") label.
2706 if (newsmack == smack_known_web.smk_known)
2709 oldtsp = p->cred->security;
2710 new = prepare_creds();
2714 tsp = new_task_smack(newsmack, oldtsp->smk_forked, GFP_KERNEL);
2719 rc = smk_copy_rules(&tsp->smk_rules, &oldtsp->smk_rules, GFP_KERNEL);
2723 new->security = tsp;
2729 * smack_unix_stream_connect - Smack access on UDS
2731 * @other: the other sock
2734 * Return 0 if a subject with the smack of sock could access
2735 * an object with the smack of other, otherwise an error code
2737 static int smack_unix_stream_connect(struct sock *sock,
2738 struct sock *other, struct sock *newsk)
2740 struct socket_smack *ssp = sock->sk_security;
2741 struct socket_smack *osp = other->sk_security;
2742 struct smk_audit_info ad;
2745 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2746 smk_ad_setfield_u_net_sk(&ad, other);
2748 if (!capable(CAP_MAC_OVERRIDE))
2749 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2755 * smack_unix_may_send - Smack access on UDS
2757 * @other: the other socket
2759 * Return 0 if a subject with the smack of sock could access
2760 * an object with the smack of other, otherwise an error code
2762 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2764 struct socket_smack *ssp = sock->sk->sk_security;
2765 struct socket_smack *osp = other->sk->sk_security;
2766 struct smk_audit_info ad;
2769 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2770 smk_ad_setfield_u_net_sk(&ad, other->sk);
2772 if (!capable(CAP_MAC_OVERRIDE))
2773 rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad);
2779 * smack_socket_sendmsg - Smack check based on destination host
2782 * @size: the size of the message
2784 * Return 0 if the current subject can write to the destination
2785 * host. This is only a question if the destination is a single
2788 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
2791 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
2794 * Perfectly reasonable for this to be NULL
2796 if (sip == NULL || sip->sin_family != AF_INET)
2799 return smack_netlabel_send(sock->sk, sip);
2804 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
2805 * @sap: netlabel secattr
2806 * @sip: where to put the result
2808 * Copies a smack label into sip
2810 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2812 char smack[SMK_LABELLEN];
2816 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
2818 * Looks like a CIPSO packet.
2819 * If there are flags but no level netlabel isn't
2820 * behaving the way we expect it to.
2822 * Get the categories, if any
2823 * Without guidance regarding the smack value
2824 * for the packet fall back on the network
2827 memset(smack, '\0', SMK_LABELLEN);
2828 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2830 pcat = netlbl_secattr_catmap_walk(
2831 sap->attr.mls.cat, pcat + 1);
2834 smack_catset_bit(pcat, smack);
2837 * If it is CIPSO using smack direct mapping
2838 * we are already done. WeeHee.
2840 if (sap->attr.mls.lvl == smack_cipso_direct) {
2841 memcpy(sip, smack, SMK_MAXLEN);
2845 * Look it up in the supplied table if it is not
2848 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2851 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
2853 * Looks like a fallback, which gives us a secid.
2855 sp = smack_from_secid(sap->attr.secid);
2857 * This has got to be a bug because it is
2858 * impossible to specify a fallback without
2859 * specifying the label, which will ensure
2860 * it has a secid, and the only way to get a
2861 * secid is from a fallback.
2864 strncpy(sip, sp, SMK_MAXLEN);
2868 * Without guidance regarding the smack value
2869 * for the packet fall back on the network
2872 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2877 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2881 * Returns 0 if the packet should be delivered, an error code otherwise
2883 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2885 struct netlbl_lsm_secattr secattr;
2886 struct socket_smack *ssp = sk->sk_security;
2887 char smack[SMK_LABELLEN];
2890 struct smk_audit_info ad;
2891 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2895 * Translate what netlabel gave us.
2897 netlbl_secattr_init(&secattr);
2899 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2901 smack_from_secattr(&secattr, smack);
2904 csp = smack_net_ambient;
2906 netlbl_secattr_destroy(&secattr);
2909 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
2910 ad.a.u.net.family = sk->sk_family;
2911 ad.a.u.net.netif = skb->skb_iif;
2912 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
2915 * Receiving a packet requires that the other end
2916 * be able to write here. Read access is not required.
2917 * This is the simplist possible security model
2920 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad);
2922 netlbl_skbuff_err(skb, rc, 0);
2927 * smack_socket_getpeersec_stream - pull in packet label
2929 * @optval: user's destination
2930 * @optlen: size thereof
2933 * returns zero on success, an error code otherwise
2935 static int smack_socket_getpeersec_stream(struct socket *sock,
2936 char __user *optval,
2937 int __user *optlen, unsigned len)
2939 struct socket_smack *ssp;
2943 ssp = sock->sk->sk_security;
2944 slen = strlen(ssp->smk_packet) + 1;
2948 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2951 if (put_user(slen, optlen) != 0)
2959 * smack_socket_getpeersec_dgram - pull in packet label
2960 * @sock: the peer socket
2962 * @secid: pointer to where to put the secid of the packet
2964 * Sets the netlabel socket state on sk from parent
2966 static int smack_socket_getpeersec_dgram(struct socket *sock,
2967 struct sk_buff *skb, u32 *secid)
2970 struct netlbl_lsm_secattr secattr;
2971 struct socket_smack *sp;
2972 char smack[SMK_LABELLEN];
2973 int family = PF_UNSPEC;
2974 u32 s = 0; /* 0 is the invalid secid */
2978 if (skb->protocol == htons(ETH_P_IP))
2980 else if (skb->protocol == htons(ETH_P_IPV6))
2983 if (family == PF_UNSPEC && sock != NULL)
2984 family = sock->sk->sk_family;
2986 if (family == PF_UNIX) {
2987 sp = sock->sk->sk_security;
2988 s = smack_to_secid(sp->smk_out);
2989 } else if (family == PF_INET || family == PF_INET6) {
2991 * Translate what netlabel gave us.
2993 netlbl_secattr_init(&secattr);
2994 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2996 smack_from_secattr(&secattr, smack);
2997 s = smack_to_secid(smack);
2999 netlbl_secattr_destroy(&secattr);
3008 * smack_sock_graft - Initialize a newly created socket with an existing sock
3010 * @parent: parent socket
3012 * Set the smk_{in,out} state of an existing sock based on the process that
3013 * is creating the new socket.
3015 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3017 struct socket_smack *ssp;
3020 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3023 ssp = sk->sk_security;
3024 ssp->smk_in = ssp->smk_out = smk_of_current();
3025 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3029 * smack_inet_conn_request - Smack access check on connect
3030 * @sk: socket involved
3034 * Returns 0 if a task with the packet label could write to
3035 * the socket, otherwise an error code
3037 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3038 struct request_sock *req)
3040 u16 family = sk->sk_family;
3041 struct socket_smack *ssp = sk->sk_security;
3042 struct netlbl_lsm_secattr secattr;
3043 struct sockaddr_in addr;
3045 char smack[SMK_LABELLEN];
3047 struct smk_audit_info ad;
3049 /* handle mapped IPv4 packets arriving via IPv6 sockets */
3050 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3053 netlbl_secattr_init(&secattr);
3054 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3056 smack_from_secattr(&secattr, smack);
3058 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
3059 netlbl_secattr_destroy(&secattr);
3062 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET);
3063 ad.a.u.net.family = family;
3064 ad.a.u.net.netif = skb->skb_iif;
3065 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3068 * Receiving a packet requires that the other end be able to write
3069 * here. Read access is not required.
3071 rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad);
3076 * Save the peer's label in the request_sock so we can later setup
3077 * smk_packet in the child socket so that SO_PEERCRED can report it.
3079 req->peer_secid = smack_to_secid(smack);
3082 * We need to decide if we want to label the incoming connection here
3083 * if we do we only need to label the request_sock and the stack will
3084 * propogate the wire-label to the sock when it is created.
3087 addr.sin_addr.s_addr = hdr->saddr;
3089 if (smack_host_label(&addr) == NULL) {
3091 netlbl_secattr_init(&secattr);
3092 smack_to_secattr(smack, &secattr);
3093 rc = netlbl_req_setattr(req, &secattr);
3094 netlbl_secattr_destroy(&secattr);
3097 netlbl_req_delattr(req);
3104 * smack_inet_csk_clone - Copy the connection information to the new socket
3105 * @sk: the new socket
3106 * @req: the connection's request_sock
3108 * Transfer the connection's peer label to the newly created socket.
3110 static void smack_inet_csk_clone(struct sock *sk,
3111 const struct request_sock *req)
3113 struct socket_smack *ssp = sk->sk_security;
3116 if (req->peer_secid != 0) {
3117 smack = smack_from_secid(req->peer_secid);
3118 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
3120 ssp->smk_packet[0] = '\0';
3124 * Key management security hooks
3126 * Casey has not tested key support very heavily.
3127 * The permission check is most likely too restrictive.
3128 * If you care about keys please have a look.
3133 * smack_key_alloc - Set the key security blob
3135 * @cred: the credentials to use
3138 * No allocation required
3142 static int smack_key_alloc(struct key *key, const struct cred *cred,
3143 unsigned long flags)
3145 key->security = smk_of_task(cred->security);
3150 * smack_key_free - Clear the key security blob
3153 * Clear the blob pointer
3155 static void smack_key_free(struct key *key)
3157 key->security = NULL;
3161 * smack_key_permission - Smack access on a key
3162 * @key_ref: gets to the object
3163 * @cred: the credentials to use
3166 * Return 0 if the task has read and write to the object,
3167 * an error code otherwise
3169 static int smack_key_permission(key_ref_t key_ref,
3170 const struct cred *cred, key_perm_t perm)
3173 struct smk_audit_info ad;
3174 char *tsp = smk_of_task(cred->security);
3176 keyp = key_ref_to_ptr(key_ref);
3180 * If the key hasn't been initialized give it access so that
3183 if (keyp->security == NULL)
3186 * This should not occur
3191 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3192 ad.a.u.key_struct.key = keyp->serial;
3193 ad.a.u.key_struct.key_desc = keyp->description;
3195 return smk_access(tsp, keyp->security,
3196 MAY_READWRITE, &ad);
3198 #endif /* CONFIG_KEYS */
3203 * Audit requires a unique representation of each Smack specific
3204 * rule. This unique representation is used to distinguish the
3205 * object to be audited from remaining kernel objects and also
3206 * works as a glue between the audit hooks.
3208 * Since repository entries are added but never deleted, we'll use
3209 * the smack_known label address related to the given audit rule as
3210 * the needed unique representation. This also better fits the smack
3211 * model where nearly everything is a label.
3216 * smack_audit_rule_init - Initialize a smack audit rule
3217 * @field: audit rule fields given from user-space (audit.h)
3218 * @op: required testing operator (=, !=, >, <, ...)
3219 * @rulestr: smack label to be audited
3220 * @vrule: pointer to save our own audit rule representation
3222 * Prepare to audit cases where (@field @op @rulestr) is true.
3223 * The label to be audited is created if necessay.
3225 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3227 char **rule = (char **)vrule;
3230 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3233 if (op != Audit_equal && op != Audit_not_equal)
3236 *rule = smk_import(rulestr, 0);
3242 * smack_audit_rule_known - Distinguish Smack audit rules
3243 * @krule: rule of interest, in Audit kernel representation format
3245 * This is used to filter Smack rules from remaining Audit ones.
3246 * If it's proved that this rule belongs to us, the
3247 * audit_rule_match hook will be called to do the final judgement.
3249 static int smack_audit_rule_known(struct audit_krule *krule)
3251 struct audit_field *f;
3254 for (i = 0; i < krule->field_count; i++) {
3255 f = &krule->fields[i];
3257 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3265 * smack_audit_rule_match - Audit given object ?
3266 * @secid: security id for identifying the object to test
3267 * @field: audit rule flags given from user-space
3268 * @op: required testing operator
3269 * @vrule: smack internal rule presentation
3270 * @actx: audit context associated with the check
3272 * The core Audit hook. It's used to take the decision of
3273 * whether to audit or not to audit a given object.
3275 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3276 struct audit_context *actx)
3282 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
3283 "Smack: missing rule\n");
3287 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3290 smack = smack_from_secid(secid);
3293 * No need to do string comparisons. If a match occurs,
3294 * both pointers will point to the same smack_known
3297 if (op == Audit_equal)
3298 return (rule == smack);
3299 if (op == Audit_not_equal)
3300 return (rule != smack);
3306 * smack_audit_rule_free - free smack rule representation
3307 * @vrule: rule to be freed.
3309 * No memory was allocated.
3311 static void smack_audit_rule_free(void *vrule)
3316 #endif /* CONFIG_AUDIT */
3319 * smack_secid_to_secctx - return the smack label for a secid
3320 * @secid: incoming integer
3321 * @secdata: destination
3322 * @seclen: how long it is
3324 * Exists for networking code.
3326 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3328 char *sp = smack_from_secid(secid);
3332 *seclen = strlen(sp);
3337 * smack_secctx_to_secid - return the secid for a smack label
3338 * @secdata: smack label
3339 * @seclen: how long result is
3340 * @secid: outgoing integer
3342 * Exists for audit and networking code.
3344 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3346 *secid = smack_to_secid(secdata);
3351 * smack_release_secctx - don't do anything.
3355 * Exists to make sure nothing gets done, and properly
3357 static void smack_release_secctx(char *secdata, u32 seclen)
3361 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3363 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3366 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3368 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3371 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3374 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3382 struct security_operations smack_ops = {
3385 .ptrace_access_check = smack_ptrace_access_check,
3386 .ptrace_traceme = smack_ptrace_traceme,
3387 .syslog = smack_syslog,
3389 .sb_alloc_security = smack_sb_alloc_security,
3390 .sb_free_security = smack_sb_free_security,
3391 .sb_copy_data = smack_sb_copy_data,
3392 .sb_kern_mount = smack_sb_kern_mount,
3393 .sb_statfs = smack_sb_statfs,
3394 .sb_mount = smack_sb_mount,
3395 .sb_umount = smack_sb_umount,
3397 .bprm_set_creds = smack_bprm_set_creds,
3399 .inode_alloc_security = smack_inode_alloc_security,
3400 .inode_free_security = smack_inode_free_security,
3401 .inode_init_security = smack_inode_init_security,
3402 .inode_link = smack_inode_link,
3403 .inode_unlink = smack_inode_unlink,
3404 .inode_rmdir = smack_inode_rmdir,
3405 .inode_rename = smack_inode_rename,
3406 .inode_permission = smack_inode_permission,
3407 .inode_setattr = smack_inode_setattr,
3408 .inode_getattr = smack_inode_getattr,
3409 .inode_setxattr = smack_inode_setxattr,
3410 .inode_post_setxattr = smack_inode_post_setxattr,
3411 .inode_getxattr = smack_inode_getxattr,
3412 .inode_removexattr = smack_inode_removexattr,
3413 .inode_getsecurity = smack_inode_getsecurity,
3414 .inode_setsecurity = smack_inode_setsecurity,
3415 .inode_listsecurity = smack_inode_listsecurity,
3416 .inode_getsecid = smack_inode_getsecid,
3418 .file_permission = smack_file_permission,
3419 .file_alloc_security = smack_file_alloc_security,
3420 .file_free_security = smack_file_free_security,
3421 .file_ioctl = smack_file_ioctl,
3422 .file_lock = smack_file_lock,
3423 .file_fcntl = smack_file_fcntl,
3424 .file_mmap = smack_file_mmap,
3425 .file_set_fowner = smack_file_set_fowner,
3426 .file_send_sigiotask = smack_file_send_sigiotask,
3427 .file_receive = smack_file_receive,
3429 .cred_alloc_blank = smack_cred_alloc_blank,
3430 .cred_free = smack_cred_free,
3431 .cred_prepare = smack_cred_prepare,
3432 .cred_transfer = smack_cred_transfer,
3433 .kernel_act_as = smack_kernel_act_as,
3434 .kernel_create_files_as = smack_kernel_create_files_as,
3435 .task_setpgid = smack_task_setpgid,
3436 .task_getpgid = smack_task_getpgid,
3437 .task_getsid = smack_task_getsid,
3438 .task_getsecid = smack_task_getsecid,
3439 .task_setnice = smack_task_setnice,
3440 .task_setioprio = smack_task_setioprio,
3441 .task_getioprio = smack_task_getioprio,
3442 .task_setscheduler = smack_task_setscheduler,
3443 .task_getscheduler = smack_task_getscheduler,
3444 .task_movememory = smack_task_movememory,
3445 .task_kill = smack_task_kill,
3446 .task_wait = smack_task_wait,
3447 .task_to_inode = smack_task_to_inode,
3449 .ipc_permission = smack_ipc_permission,
3450 .ipc_getsecid = smack_ipc_getsecid,
3452 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3453 .msg_msg_free_security = smack_msg_msg_free_security,
3455 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3456 .msg_queue_free_security = smack_msg_queue_free_security,
3457 .msg_queue_associate = smack_msg_queue_associate,
3458 .msg_queue_msgctl = smack_msg_queue_msgctl,
3459 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3460 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3462 .shm_alloc_security = smack_shm_alloc_security,
3463 .shm_free_security = smack_shm_free_security,
3464 .shm_associate = smack_shm_associate,
3465 .shm_shmctl = smack_shm_shmctl,
3466 .shm_shmat = smack_shm_shmat,
3468 .sem_alloc_security = smack_sem_alloc_security,
3469 .sem_free_security = smack_sem_free_security,
3470 .sem_associate = smack_sem_associate,
3471 .sem_semctl = smack_sem_semctl,
3472 .sem_semop = smack_sem_semop,
3474 .d_instantiate = smack_d_instantiate,
3476 .getprocattr = smack_getprocattr,
3477 .setprocattr = smack_setprocattr,
3479 .unix_stream_connect = smack_unix_stream_connect,
3480 .unix_may_send = smack_unix_may_send,
3482 .socket_post_create = smack_socket_post_create,
3483 .socket_connect = smack_socket_connect,
3484 .socket_sendmsg = smack_socket_sendmsg,
3485 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3486 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3487 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3488 .sk_alloc_security = smack_sk_alloc_security,
3489 .sk_free_security = smack_sk_free_security,
3490 .sock_graft = smack_sock_graft,
3491 .inet_conn_request = smack_inet_conn_request,
3492 .inet_csk_clone = smack_inet_csk_clone,
3494 /* key management security hooks */
3496 .key_alloc = smack_key_alloc,
3497 .key_free = smack_key_free,
3498 .key_permission = smack_key_permission,
3499 #endif /* CONFIG_KEYS */
3503 .audit_rule_init = smack_audit_rule_init,
3504 .audit_rule_known = smack_audit_rule_known,
3505 .audit_rule_match = smack_audit_rule_match,
3506 .audit_rule_free = smack_audit_rule_free,
3507 #endif /* CONFIG_AUDIT */
3509 .secid_to_secctx = smack_secid_to_secctx,
3510 .secctx_to_secid = smack_secctx_to_secid,
3511 .release_secctx = smack_release_secctx,
3512 .inode_notifysecctx = smack_inode_notifysecctx,
3513 .inode_setsecctx = smack_inode_setsecctx,
3514 .inode_getsecctx = smack_inode_getsecctx,
3518 static __init void init_smack_know_list(void)
3520 list_add(&smack_known_huh.list, &smack_known_list);
3521 list_add(&smack_known_hat.list, &smack_known_list);
3522 list_add(&smack_known_star.list, &smack_known_list);
3523 list_add(&smack_known_floor.list, &smack_known_list);
3524 list_add(&smack_known_invalid.list, &smack_known_list);
3525 list_add(&smack_known_web.list, &smack_known_list);
3529 * smack_init - initialize the smack system
3533 static __init int smack_init(void)
3536 struct task_smack *tsp;
3538 if (!security_module_enable(&smack_ops))
3541 tsp = new_task_smack(smack_known_floor.smk_known,
3542 smack_known_floor.smk_known, GFP_KERNEL);
3546 printk(KERN_INFO "Smack: Initializing.\n");
3549 * Set the security state for the initial task.
3551 cred = (struct cred *) current->cred;
3552 cred->security = tsp;
3554 /* initialize the smack_know_list */
3555 init_smack_know_list();
3559 spin_lock_init(&smack_known_huh.smk_cipsolock);
3560 spin_lock_init(&smack_known_hat.smk_cipsolock);
3561 spin_lock_init(&smack_known_star.smk_cipsolock);
3562 spin_lock_init(&smack_known_floor.smk_cipsolock);
3563 spin_lock_init(&smack_known_invalid.smk_cipsolock);
3568 if (register_security(&smack_ops))
3569 panic("smack: Unable to register with kernel.\n");
3575 * Smack requires early initialization in order to label
3576 * all processes and objects when they are created.
3578 security_initcall(smack_init);