2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com>
10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
12 * Paul Moore <paul@paul-moore.com>
13 * Copyright (C) 2010 Nokia Corporation
14 * Copyright (C) 2011 Intel Corporation.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/xattr.h>
22 #include <linux/pagemap.h>
23 #include <linux/mount.h>
24 #include <linux/stat.h>
26 #include <asm/ioctls.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/dccp.h>
31 #include <linux/slab.h>
32 #include <linux/mutex.h>
33 #include <linux/pipe_fs_i.h>
34 #include <net/cipso_ipv4.h>
37 #include <linux/audit.h>
38 #include <linux/magic.h>
39 #include <linux/dcache.h>
40 #include <linux/personality.h>
41 #include <linux/msg.h>
42 #include <linux/shm.h>
43 #include <linux/binfmts.h>
46 #define task_security(task) (task_cred_xxx((task), security))
48 #define TRANS_TRUE "TRUE"
49 #define TRANS_TRUE_SIZE 4
51 #define SMK_CONNECTING 0
52 #define SMK_RECEIVING 1
55 LIST_HEAD(smk_ipv6_port_list);
58 * smk_fetch - Fetch the smack label from a file.
59 * @ip: a pointer to the inode
60 * @dp: a pointer to the dentry
62 * Returns a pointer to the master list entry for the Smack label
63 * or NULL if there was no label to fetch.
65 static struct smack_known *smk_fetch(const char *name, struct inode *ip,
70 struct smack_known *skp = NULL;
72 if (ip->i_op->getxattr == NULL)
75 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL);
79 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL);
81 skp = smk_import_entry(buffer, rc);
89 * new_inode_smack - allocate an inode security blob
90 * @smack: a pointer to the Smack label to use in the blob
92 * Returns the new blob or NULL if there's no memory available
94 struct inode_smack *new_inode_smack(char *smack)
96 struct inode_smack *isp;
98 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS);
102 isp->smk_inode = smack;
104 mutex_init(&isp->smk_lock);
110 * new_task_smack - allocate a task security blob
111 * @smack: a pointer to the Smack label to use in the blob
113 * Returns the new blob or NULL if there's no memory available
115 static struct task_smack *new_task_smack(struct smack_known *task,
116 struct smack_known *forked, gfp_t gfp)
118 struct task_smack *tsp;
120 tsp = kzalloc(sizeof(struct task_smack), gfp);
124 tsp->smk_task = task;
125 tsp->smk_forked = forked;
126 INIT_LIST_HEAD(&tsp->smk_rules);
127 mutex_init(&tsp->smk_rules_lock);
133 * smk_copy_rules - copy a rule set
134 * @nhead - new rules header pointer
135 * @ohead - old rules header pointer
137 * Returns 0 on success, -ENOMEM on error
139 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
142 struct smack_rule *nrp;
143 struct smack_rule *orp;
146 INIT_LIST_HEAD(nhead);
148 list_for_each_entry_rcu(orp, ohead, list) {
149 nrp = kzalloc(sizeof(struct smack_rule), gfp);
155 list_add_rcu(&nrp->list, nhead);
162 * We he, that is fun!
166 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH
167 * @ctp: child task pointer
168 * @mode: ptrace attachment mode
170 * Returns 0 if access is OK, an error code otherwise
172 * Do the capability checks, and require read and write.
174 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
177 struct smk_audit_info ad;
178 struct smack_known *skp;
180 rc = cap_ptrace_access_check(ctp, mode);
184 skp = smk_of_task(task_security(ctp));
185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
186 smk_ad_setfield_u_tsk(&ad, ctp);
188 rc = smk_curacc(skp->smk_known, mode, &ad);
193 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
194 * @ptp: parent task pointer
196 * Returns 0 if access is OK, an error code otherwise
198 * Do the capability checks, and require read and write.
200 static int smack_ptrace_traceme(struct task_struct *ptp)
203 struct smk_audit_info ad;
204 struct smack_known *skp;
206 rc = cap_ptrace_traceme(ptp);
210 skp = smk_of_task(task_security(ptp));
211 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
212 smk_ad_setfield_u_tsk(&ad, ptp);
214 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad);
219 * smack_syslog - Smack approval on syslog
220 * @type: message type
222 * Returns 0 on success, error code otherwise.
224 static int smack_syslog(int typefrom_file)
227 struct smack_known *skp = smk_of_current();
229 if (smack_privileged(CAP_MAC_OVERRIDE))
232 if (smack_syslog_label != NULL && smack_syslog_label != skp)
244 * smack_sb_alloc_security - allocate a superblock blob
245 * @sb: the superblock getting the blob
247 * Returns 0 on success or -ENOMEM on error.
249 static int smack_sb_alloc_security(struct super_block *sb)
251 struct superblock_smack *sbsp;
253 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
258 sbsp->smk_root = smack_known_floor.smk_known;
259 sbsp->smk_default = smack_known_floor.smk_known;
260 sbsp->smk_floor = smack_known_floor.smk_known;
261 sbsp->smk_hat = smack_known_hat.smk_known;
263 * smk_initialized will be zero from kzalloc.
265 sb->s_security = sbsp;
271 * smack_sb_free_security - free a superblock blob
272 * @sb: the superblock getting the blob
275 static void smack_sb_free_security(struct super_block *sb)
277 kfree(sb->s_security);
278 sb->s_security = NULL;
282 * smack_sb_copy_data - copy mount options data for processing
283 * @orig: where to start
284 * @smackopts: mount options string
286 * Returns 0 on success or -ENOMEM on error.
288 * Copy the Smack specific mount options out of the mount
291 static int smack_sb_copy_data(char *orig, char *smackopts)
293 char *cp, *commap, *otheropts, *dp;
295 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
296 if (otheropts == NULL)
299 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
300 if (strstr(cp, SMK_FSDEFAULT) == cp)
302 else if (strstr(cp, SMK_FSFLOOR) == cp)
304 else if (strstr(cp, SMK_FSHAT) == cp)
306 else if (strstr(cp, SMK_FSROOT) == cp)
308 else if (strstr(cp, SMK_FSTRANS) == cp)
313 commap = strchr(cp, ',');
322 strcpy(orig, otheropts);
323 free_page((unsigned long)otheropts);
329 * smack_sb_kern_mount - Smack specific mount processing
330 * @sb: the file system superblock
331 * @flags: the mount flags
332 * @data: the smack mount options
334 * Returns 0 on success, an error code on failure
336 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
338 struct dentry *root = sb->s_root;
339 struct inode *inode = root->d_inode;
340 struct superblock_smack *sp = sb->s_security;
341 struct inode_smack *isp;
342 struct smack_known *skp;
349 if (sp->smk_initialized)
352 sp->smk_initialized = 1;
354 for (op = data; op != NULL; op = commap) {
355 commap = strchr(op, ',');
359 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
360 op += strlen(SMK_FSHAT);
361 nsp = smk_import(op, 0);
366 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
367 op += strlen(SMK_FSFLOOR);
368 nsp = smk_import(op, 0);
373 } else if (strncmp(op, SMK_FSDEFAULT,
374 strlen(SMK_FSDEFAULT)) == 0) {
375 op += strlen(SMK_FSDEFAULT);
376 nsp = smk_import(op, 0);
378 sp->smk_default = nsp;
381 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
382 op += strlen(SMK_FSROOT);
383 nsp = smk_import(op, 0);
388 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
389 op += strlen(SMK_FSTRANS);
390 nsp = smk_import(op, 0);
399 if (!smack_privileged(CAP_MAC_ADMIN)) {
401 * Unprivileged mounts don't get to specify Smack values.
406 * Unprivileged mounts get root and default from the caller.
408 skp = smk_of_current();
409 sp->smk_root = skp->smk_known;
410 sp->smk_default = skp->smk_known;
413 * Initialize the root inode.
415 isp = inode->i_security;
416 if (inode->i_security == NULL) {
417 inode->i_security = new_inode_smack(sp->smk_root);
418 isp = inode->i_security;
420 isp->smk_inode = sp->smk_root;
423 isp->smk_flags |= SMK_INODE_TRANSMUTE;
429 * smack_sb_statfs - Smack check on statfs
430 * @dentry: identifies the file system in question
432 * Returns 0 if current can read the floor of the filesystem,
433 * and error code otherwise
435 static int smack_sb_statfs(struct dentry *dentry)
437 struct superblock_smack *sbp = dentry->d_sb->s_security;
439 struct smk_audit_info ad;
441 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
442 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
444 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad);
453 * smack_bprm_set_creds - set creds for exec
454 * @bprm: the exec information
456 * Returns 0 if it gets a blob, -ENOMEM otherwise
458 static int smack_bprm_set_creds(struct linux_binprm *bprm)
460 struct inode *inode = file_inode(bprm->file);
461 struct task_smack *bsp = bprm->cred->security;
462 struct inode_smack *isp;
465 rc = cap_bprm_set_creds(bprm);
469 if (bprm->cred_prepared)
472 isp = inode->i_security;
473 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
479 bsp->smk_task = isp->smk_task;
480 bprm->per_clear |= PER_CLEAR_ON_SETID;
486 * smack_bprm_committing_creds - Prepare to install the new credentials
489 * @bprm: binprm for exec
491 static void smack_bprm_committing_creds(struct linux_binprm *bprm)
493 struct task_smack *bsp = bprm->cred->security;
495 if (bsp->smk_task != bsp->smk_forked)
496 current->pdeath_signal = 0;
500 * smack_bprm_secureexec - Return the decision to use secureexec.
501 * @bprm: binprm for exec
503 * Returns 0 on success.
505 static int smack_bprm_secureexec(struct linux_binprm *bprm)
507 struct task_smack *tsp = current_security();
508 int ret = cap_bprm_secureexec(bprm);
510 if (!ret && (tsp->smk_task != tsp->smk_forked))
521 * smack_inode_alloc_security - allocate an inode blob
522 * @inode: the inode in need of a blob
524 * Returns 0 if it gets a blob, -ENOMEM otherwise
526 static int smack_inode_alloc_security(struct inode *inode)
528 struct smack_known *skp = smk_of_current();
530 inode->i_security = new_inode_smack(skp->smk_known);
531 if (inode->i_security == NULL)
537 * smack_inode_free_security - free an inode blob
538 * @inode: the inode with a blob
540 * Clears the blob pointer in inode
542 static void smack_inode_free_security(struct inode *inode)
544 kfree(inode->i_security);
545 inode->i_security = NULL;
549 * smack_inode_init_security - copy out the smack from an inode
553 * @name: where to put the attribute name
554 * @value: where to put the attribute value
555 * @len: where to put the length of the attribute
557 * Returns 0 if it all works out, -ENOMEM if there's no memory
559 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
560 const struct qstr *qstr, const char **name,
561 void **value, size_t *len)
563 struct inode_smack *issp = inode->i_security;
564 struct smack_known *skp = smk_of_current();
565 char *isp = smk_of_inode(inode);
566 char *dsp = smk_of_inode(dir);
570 *name = XATTR_SMACK_SUFFIX;
574 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules);
578 * If the access rule allows transmutation and
579 * the directory requests transmutation then
580 * by all means transmute.
581 * Mark the inode as changed.
583 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
584 smk_inode_transmutable(dir)) {
586 issp->smk_flags |= SMK_INODE_CHANGED;
589 *value = kstrdup(isp, GFP_NOFS);
595 *len = strlen(isp) + 1;
601 * smack_inode_link - Smack check on link
602 * @old_dentry: the existing object
604 * @new_dentry: the new object
606 * Returns 0 if access is permitted, an error code otherwise
608 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
609 struct dentry *new_dentry)
612 struct smk_audit_info ad;
615 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
616 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
618 isp = smk_of_inode(old_dentry->d_inode);
619 rc = smk_curacc(isp, MAY_WRITE, &ad);
621 if (rc == 0 && new_dentry->d_inode != NULL) {
622 isp = smk_of_inode(new_dentry->d_inode);
623 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
624 rc = smk_curacc(isp, MAY_WRITE, &ad);
631 * smack_inode_unlink - Smack check on inode deletion
632 * @dir: containing directory object
633 * @dentry: file to unlink
635 * Returns 0 if current can write the containing directory
636 * and the object, error code otherwise
638 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
640 struct inode *ip = dentry->d_inode;
641 struct smk_audit_info ad;
644 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
645 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
648 * You need write access to the thing you're unlinking
650 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
653 * You also need write access to the containing directory
655 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
656 smk_ad_setfield_u_fs_inode(&ad, dir);
657 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
663 * smack_inode_rmdir - Smack check on directory deletion
664 * @dir: containing directory object
665 * @dentry: directory to unlink
667 * Returns 0 if current can write the containing directory
668 * and the directory, error code otherwise
670 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
672 struct smk_audit_info ad;
675 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
676 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
679 * You need write access to the thing you're removing
681 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
684 * You also need write access to the containing directory
686 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
687 smk_ad_setfield_u_fs_inode(&ad, dir);
688 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
695 * smack_inode_rename - Smack check on rename
696 * @old_inode: the old directory
697 * @old_dentry: unused
698 * @new_inode: the new directory
699 * @new_dentry: unused
701 * Read and write access is required on both the old and
704 * Returns 0 if access is permitted, an error code otherwise
706 static int smack_inode_rename(struct inode *old_inode,
707 struct dentry *old_dentry,
708 struct inode *new_inode,
709 struct dentry *new_dentry)
713 struct smk_audit_info ad;
715 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
716 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);
718 isp = smk_of_inode(old_dentry->d_inode);
719 rc = smk_curacc(isp, MAY_READWRITE, &ad);
721 if (rc == 0 && new_dentry->d_inode != NULL) {
722 isp = smk_of_inode(new_dentry->d_inode);
723 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
724 rc = smk_curacc(isp, MAY_READWRITE, &ad);
730 * smack_inode_permission - Smack version of permission()
731 * @inode: the inode in question
732 * @mask: the access requested
734 * This is the important Smack hook.
736 * Returns 0 if access is permitted, -EACCES otherwise
738 static int smack_inode_permission(struct inode *inode, int mask)
740 struct smk_audit_info ad;
741 int no_block = mask & MAY_NOT_BLOCK;
743 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
745 * No permission to check. Existence test. Yup, it's there.
750 /* May be droppable after audit */
753 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
754 smk_ad_setfield_u_fs_inode(&ad, inode);
755 return smk_curacc(smk_of_inode(inode), mask, &ad);
759 * smack_inode_setattr - Smack check for setting attributes
760 * @dentry: the object
761 * @iattr: for the force flag
763 * Returns 0 if access is permitted, an error code otherwise
765 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
767 struct smk_audit_info ad;
769 * Need to allow for clearing the setuid bit.
771 if (iattr->ia_valid & ATTR_FORCE)
773 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
774 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
776 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
780 * smack_inode_getattr - Smack check for getting attributes
782 * @dentry: the object
784 * Returns 0 if access is permitted, an error code otherwise
786 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
788 struct smk_audit_info ad;
791 path.dentry = dentry;
794 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
795 smk_ad_setfield_u_fs_path(&ad, path);
796 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
800 * smack_inode_setxattr - Smack check for setting xattrs
801 * @dentry: the object
802 * @name: name of the attribute
807 * This protects the Smack attribute explicitly.
809 * Returns 0 if access is permitted, an error code otherwise
811 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
812 const void *value, size_t size, int flags)
814 struct smk_audit_info ad;
815 struct smack_known *skp;
817 int check_import = 0;
822 * Check label validity here so import won't fail in post_setxattr
824 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
825 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
826 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
829 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
830 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
834 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
836 if (size != TRANS_TRUE_SIZE ||
837 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
840 rc = cap_inode_setxattr(dentry, name, value, size, flags);
842 if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
845 if (rc == 0 && check_import) {
846 skp = smk_import_entry(value, size);
847 if (skp == NULL || (check_star &&
848 (skp == &smack_known_star || skp == &smack_known_web)))
852 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
853 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
856 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
862 * smack_inode_post_setxattr - Apply the Smack update approved above
864 * @name: attribute name
865 * @value: attribute value
866 * @size: attribute size
869 * Set the pointer in the inode blob to the entry found
870 * in the master label list.
872 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
873 const void *value, size_t size, int flags)
875 struct smack_known *skp;
876 struct inode_smack *isp = dentry->d_inode->i_security;
878 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
879 isp->smk_flags |= SMK_INODE_TRANSMUTE;
883 skp = smk_import_entry(value, size);
884 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
886 isp->smk_inode = skp->smk_known;
888 isp->smk_inode = smack_known_invalid.smk_known;
889 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
893 isp->smk_task = &smack_known_invalid;
894 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
898 isp->smk_mmap = &smack_known_invalid;
905 * smack_inode_getxattr - Smack check on getxattr
906 * @dentry: the object
909 * Returns 0 if access is permitted, an error code otherwise
911 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
913 struct smk_audit_info ad;
915 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
916 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
918 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
922 * smack_inode_removexattr - Smack check on removexattr
923 * @dentry: the object
924 * @name: name of the attribute
926 * Removing the Smack attribute requires CAP_MAC_ADMIN
928 * Returns 0 if access is permitted, an error code otherwise
930 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
932 struct inode_smack *isp;
933 struct smk_audit_info ad;
936 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
937 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
938 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
939 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
940 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
941 strcmp(name, XATTR_NAME_SMACKMMAP)) {
942 if (!smack_privileged(CAP_MAC_ADMIN))
945 rc = cap_inode_removexattr(dentry, name);
947 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
948 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
950 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
953 isp = dentry->d_inode->i_security;
954 isp->smk_task = NULL;
955 isp->smk_mmap = NULL;
962 * smack_inode_getsecurity - get smack xattrs
964 * @name: attribute name
965 * @buffer: where to put the result
968 * Returns the size of the attribute or an error code
970 static int smack_inode_getsecurity(const struct inode *inode,
971 const char *name, void **buffer,
974 struct socket_smack *ssp;
976 struct super_block *sbp;
977 struct inode *ip = (struct inode *)inode;
982 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
983 isp = smk_of_inode(inode);
984 ilen = strlen(isp) + 1;
990 * The rest of the Smack xattrs are only on sockets.
993 if (sbp->s_magic != SOCKFS_MAGIC)
997 if (sock == NULL || sock->sk == NULL)
1000 ssp = sock->sk->sk_security;
1002 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1004 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1005 isp = ssp->smk_out->smk_known;
1009 ilen = strlen(isp) + 1;
1020 * smack_inode_listsecurity - list the Smack attributes
1021 * @inode: the object
1022 * @buffer: where they go
1023 * @buffer_size: size of buffer
1025 * Returns 0 on success, -EINVAL otherwise
1027 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1030 int len = strlen(XATTR_NAME_SMACK);
1032 if (buffer != NULL && len <= buffer_size) {
1033 memcpy(buffer, XATTR_NAME_SMACK, len);
1040 * smack_inode_getsecid - Extract inode's security id
1041 * @inode: inode to extract the info from
1042 * @secid: where result will be saved
1044 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1046 struct inode_smack *isp = inode->i_security;
1048 *secid = smack_to_secid(isp->smk_inode);
1056 * smack_file_permission - Smack check on file operations
1062 * Should access checks be done on each read or write?
1063 * UNICOS and SELinux say yes.
1064 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1066 * I'll say no for now. Smack does not do the frequent
1067 * label changing that SELinux does.
1069 static int smack_file_permission(struct file *file, int mask)
1075 * smack_file_alloc_security - assign a file security blob
1078 * The security blob for a file is a pointer to the master
1079 * label list, so no allocation is done.
1083 static int smack_file_alloc_security(struct file *file)
1085 struct smack_known *skp = smk_of_current();
1087 file->f_security = skp->smk_known;
1092 * smack_file_free_security - clear a file security blob
1095 * The security blob for a file is a pointer to the master
1096 * label list, so no memory is freed.
1098 static void smack_file_free_security(struct file *file)
1100 file->f_security = NULL;
1104 * smack_file_ioctl - Smack check on ioctls
1109 * Relies heavily on the correct use of the ioctl command conventions.
1111 * Returns 0 if allowed, error code otherwise
1113 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1117 struct smk_audit_info ad;
1119 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1120 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1122 if (_IOC_DIR(cmd) & _IOC_WRITE)
1123 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1125 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1126 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1132 * smack_file_lock - Smack check on file locking
1136 * Returns 0 if current has lock access, error code otherwise
1138 static int smack_file_lock(struct file *file, unsigned int cmd)
1140 struct smk_audit_info ad;
1142 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1143 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1144 return smk_curacc(file->f_security, MAY_LOCK, &ad);
1148 * smack_file_fcntl - Smack check on fcntl
1150 * @cmd: what action to check
1153 * Generally these operations are harmless.
1154 * File locking operations present an obvious mechanism
1155 * for passing information, so they require write access.
1157 * Returns 0 if current has access, error code otherwise
1159 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1162 struct smk_audit_info ad;
1171 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1172 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1173 rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
1177 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1178 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1179 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1190 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1191 * if mapping anonymous memory.
1192 * @file contains the file structure for file to map (may be NULL).
1193 * @reqprot contains the protection requested by the application.
1194 * @prot contains the protection that will be applied by the kernel.
1195 * @flags contains the operational flags.
1196 * Return 0 if permission is granted.
1198 static int smack_mmap_file(struct file *file,
1199 unsigned long reqprot, unsigned long prot,
1200 unsigned long flags)
1202 struct smack_known *skp;
1203 struct smack_known *mkp;
1204 struct smack_rule *srp;
1205 struct task_smack *tsp;
1207 struct inode_smack *isp;
1216 isp = file_inode(file)->i_security;
1217 if (isp->smk_mmap == NULL)
1219 mkp = isp->smk_mmap;
1221 tsp = current_security();
1222 skp = smk_of_current();
1227 * For each Smack rule associated with the subject
1228 * label verify that the SMACK64MMAP also has access
1229 * to that rule's object label.
1231 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1232 osmack = srp->smk_object;
1234 * Matching labels always allows access.
1236 if (mkp->smk_known == osmack)
1239 * If there is a matching local rule take
1240 * that into account as well.
1242 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
1245 may = srp->smk_access;
1247 may &= srp->smk_access;
1249 * If may is zero the SMACK64MMAP subject can't
1250 * possibly have less access.
1256 * Fetch the global list entry.
1257 * If there isn't one a SMACK64MMAP subject
1258 * can't have as much access as current.
1260 mmay = smk_access_entry(mkp->smk_known, osmack,
1262 if (mmay == -ENOENT) {
1267 * If there is a local entry it modifies the
1268 * potential access, too.
1270 tmay = smk_access_entry(mkp->smk_known, osmack,
1272 if (tmay != -ENOENT)
1276 * If there is any access available to current that is
1277 * not available to a SMACK64MMAP subject
1280 if ((may | mmay) != mmay) {
1292 * smack_file_set_fowner - set the file security blob value
1293 * @file: object in question
1296 * Further research may be required on this one.
1298 static int smack_file_set_fowner(struct file *file)
1300 struct smack_known *skp = smk_of_current();
1302 file->f_security = skp->smk_known;
1307 * smack_file_send_sigiotask - Smack on sigio
1308 * @tsk: The target task
1309 * @fown: the object the signal come from
1312 * Allow a privileged task to get signals even if it shouldn't
1314 * Returns 0 if a subject with the object's smack could
1315 * write to the task, an error code otherwise.
1317 static int smack_file_send_sigiotask(struct task_struct *tsk,
1318 struct fown_struct *fown, int signum)
1320 struct smack_known *skp;
1321 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1324 struct smk_audit_info ad;
1327 * struct fown_struct is never outside the context of a struct file
1329 file = container_of(fown, struct file, f_owner);
1331 /* we don't log here as rc can be overriden */
1332 skp = smk_find_entry(file->f_security);
1333 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
1334 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1337 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1338 smk_ad_setfield_u_tsk(&ad, tsk);
1339 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
1344 * smack_file_receive - Smack file receive check
1347 * Returns 0 if current has access, error code otherwise
1349 static int smack_file_receive(struct file *file)
1352 struct smk_audit_info ad;
1354 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1355 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1357 * This code relies on bitmasks.
1359 if (file->f_mode & FMODE_READ)
1361 if (file->f_mode & FMODE_WRITE)
1364 return smk_curacc(file->f_security, may, &ad);
1368 * smack_file_open - Smack dentry open processing
1372 * Set the security blob in the file structure.
1376 static int smack_file_open(struct file *file, const struct cred *cred)
1378 struct inode_smack *isp = file_inode(file)->i_security;
1380 file->f_security = isp->smk_inode;
1390 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1391 * @new: the new credentials
1392 * @gfp: the atomicity of any memory allocations
1394 * Prepare a blank set of credentials for modification. This must allocate all
1395 * the memory the LSM module might require such that cred_transfer() can
1396 * complete without error.
1398 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1400 struct task_smack *tsp;
1402 tsp = new_task_smack(NULL, NULL, gfp);
1406 cred->security = tsp;
1413 * smack_cred_free - "free" task-level security credentials
1414 * @cred: the credentials in question
1417 static void smack_cred_free(struct cred *cred)
1419 struct task_smack *tsp = cred->security;
1420 struct smack_rule *rp;
1421 struct list_head *l;
1422 struct list_head *n;
1426 cred->security = NULL;
1428 list_for_each_safe(l, n, &tsp->smk_rules) {
1429 rp = list_entry(l, struct smack_rule, list);
1430 list_del(&rp->list);
1437 * smack_cred_prepare - prepare new set of credentials for modification
1438 * @new: the new credentials
1439 * @old: the original credentials
1440 * @gfp: the atomicity of any memory allocations
1442 * Prepare a new set of credentials for modification.
1444 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1447 struct task_smack *old_tsp = old->security;
1448 struct task_smack *new_tsp;
1451 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1452 if (new_tsp == NULL)
1455 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1459 new->security = new_tsp;
1464 * smack_cred_transfer - Transfer the old credentials to the new credentials
1465 * @new: the new credentials
1466 * @old: the original credentials
1468 * Fill in a set of blank credentials from another set of credentials.
1470 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1472 struct task_smack *old_tsp = old->security;
1473 struct task_smack *new_tsp = new->security;
1475 new_tsp->smk_task = old_tsp->smk_task;
1476 new_tsp->smk_forked = old_tsp->smk_task;
1477 mutex_init(&new_tsp->smk_rules_lock);
1478 INIT_LIST_HEAD(&new_tsp->smk_rules);
1481 /* cbs copy rule list */
1485 * smack_kernel_act_as - Set the subjective context in a set of credentials
1486 * @new: points to the set of credentials to be modified.
1487 * @secid: specifies the security ID to be set
1489 * Set the security data for a kernel service.
1491 static int smack_kernel_act_as(struct cred *new, u32 secid)
1493 struct task_smack *new_tsp = new->security;
1494 struct smack_known *skp = smack_from_secid(secid);
1499 new_tsp->smk_task = skp;
1504 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1505 * @new: points to the set of credentials to be modified
1506 * @inode: points to the inode to use as a reference
1508 * Set the file creation context in a set of credentials to the same
1509 * as the objective context of the specified inode
1511 static int smack_kernel_create_files_as(struct cred *new,
1512 struct inode *inode)
1514 struct inode_smack *isp = inode->i_security;
1515 struct task_smack *tsp = new->security;
1517 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1518 tsp->smk_task = tsp->smk_forked;
1523 * smk_curacc_on_task - helper to log task related access
1524 * @p: the task object
1525 * @access: the access requested
1526 * @caller: name of the calling function for audit
1528 * Return 0 if access is permitted
1530 static int smk_curacc_on_task(struct task_struct *p, int access,
1533 struct smk_audit_info ad;
1534 struct smack_known *skp = smk_of_task(task_security(p));
1536 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1537 smk_ad_setfield_u_tsk(&ad, p);
1538 return smk_curacc(skp->smk_known, access, &ad);
1542 * smack_task_setpgid - Smack check on setting pgid
1543 * @p: the task object
1546 * Return 0 if write access is permitted
1548 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1550 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1554 * smack_task_getpgid - Smack access check for getpgid
1555 * @p: the object task
1557 * Returns 0 if current can read the object task, error code otherwise
1559 static int smack_task_getpgid(struct task_struct *p)
1561 return smk_curacc_on_task(p, MAY_READ, __func__);
1565 * smack_task_getsid - Smack access check for getsid
1566 * @p: the object task
1568 * Returns 0 if current can read the object task, error code otherwise
1570 static int smack_task_getsid(struct task_struct *p)
1572 return smk_curacc_on_task(p, MAY_READ, __func__);
1576 * smack_task_getsecid - get the secid of the task
1577 * @p: the object task
1578 * @secid: where to put the result
1580 * Sets the secid to contain a u32 version of the smack label.
1582 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1584 struct smack_known *skp = smk_of_task(task_security(p));
1586 *secid = skp->smk_secid;
1590 * smack_task_setnice - Smack check on setting nice
1591 * @p: the task object
1594 * Return 0 if write access is permitted
1596 static int smack_task_setnice(struct task_struct *p, int nice)
1600 rc = cap_task_setnice(p, nice);
1602 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1607 * smack_task_setioprio - Smack check on setting ioprio
1608 * @p: the task object
1611 * Return 0 if write access is permitted
1613 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1617 rc = cap_task_setioprio(p, ioprio);
1619 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1624 * smack_task_getioprio - Smack check on reading ioprio
1625 * @p: the task object
1627 * Return 0 if read access is permitted
1629 static int smack_task_getioprio(struct task_struct *p)
1631 return smk_curacc_on_task(p, MAY_READ, __func__);
1635 * smack_task_setscheduler - Smack check on setting scheduler
1636 * @p: the task object
1640 * Return 0 if read access is permitted
1642 static int smack_task_setscheduler(struct task_struct *p)
1646 rc = cap_task_setscheduler(p);
1648 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1653 * smack_task_getscheduler - Smack check on reading scheduler
1654 * @p: the task object
1656 * Return 0 if read access is permitted
1658 static int smack_task_getscheduler(struct task_struct *p)
1660 return smk_curacc_on_task(p, MAY_READ, __func__);
1664 * smack_task_movememory - Smack check on moving memory
1665 * @p: the task object
1667 * Return 0 if write access is permitted
1669 static int smack_task_movememory(struct task_struct *p)
1671 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1675 * smack_task_kill - Smack check on signal delivery
1676 * @p: the task object
1679 * @secid: identifies the smack to use in lieu of current's
1681 * Return 0 if write access is permitted
1683 * The secid behavior is an artifact of an SELinux hack
1684 * in the USB code. Someday it may go away.
1686 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1689 struct smk_audit_info ad;
1690 struct smack_known *skp;
1691 struct smack_known *tkp = smk_of_task(task_security(p));
1693 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1694 smk_ad_setfield_u_tsk(&ad, p);
1696 * Sending a signal requires that the sender
1697 * can write the receiver.
1700 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
1702 * If the secid isn't 0 we're dealing with some USB IO
1703 * specific behavior. This is not clean. For one thing
1704 * we can't take privilege into account.
1706 skp = smack_from_secid(secid);
1707 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
1711 * smack_task_wait - Smack access check for waiting
1712 * @p: task to wait for
1716 static int smack_task_wait(struct task_struct *p)
1719 * Allow the operation to succeed.
1721 * In userless environments (e.g. phones) programs
1722 * get marked with SMACK64EXEC and even if the parent
1723 * and child shouldn't be talking the parent still
1724 * may expect to know when the child exits.
1730 * smack_task_to_inode - copy task smack into the inode blob
1731 * @p: task to copy from
1732 * @inode: inode to copy to
1734 * Sets the smack pointer in the inode security blob
1736 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1738 struct inode_smack *isp = inode->i_security;
1739 struct smack_known *skp = smk_of_task(task_security(p));
1741 isp->smk_inode = skp->smk_known;
1749 * smack_sk_alloc_security - Allocate a socket blob
1752 * @gfp_flags: memory allocation flags
1754 * Assign Smack pointers to current
1756 * Returns 0 on success, -ENOMEM is there's no memory
1758 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1760 struct smack_known *skp = smk_of_current();
1761 struct socket_smack *ssp;
1763 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1767 ssp->smk_in = skp->smk_known;
1769 ssp->smk_packet = NULL;
1771 sk->sk_security = ssp;
1777 * smack_sk_free_security - Free a socket blob
1780 * Clears the blob pointer
1782 static void smack_sk_free_security(struct sock *sk)
1784 kfree(sk->sk_security);
1788 * smack_host_label - check host based restrictions
1789 * @sip: the object end
1791 * looks for host based access restrictions
1793 * This version will only be appropriate for really small sets of single label
1794 * hosts. The caller is responsible for ensuring that the RCU read lock is
1795 * taken before calling this function.
1797 * Returns the label of the far end or NULL if it's not special.
1799 static char *smack_host_label(struct sockaddr_in *sip)
1801 struct smk_netlbladdr *snp;
1802 struct in_addr *siap = &sip->sin_addr;
1804 if (siap->s_addr == 0)
1807 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1809 * we break after finding the first match because
1810 * the list is sorted from longest to shortest mask
1811 * so we have found the most specific match
1813 if ((&snp->smk_host.sin_addr)->s_addr ==
1814 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1815 /* we have found the special CIPSO option */
1816 if (snp->smk_label == smack_cipso_option)
1818 return snp->smk_label;
1825 * smack_netlabel - Set the secattr on a socket
1827 * @labeled: socket label scheme
1829 * Convert the outbound smack value (smk_out) to a
1830 * secattr and attach it to the socket.
1832 * Returns 0 on success or an error code
1834 static int smack_netlabel(struct sock *sk, int labeled)
1836 struct smack_known *skp;
1837 struct socket_smack *ssp = sk->sk_security;
1841 * Usually the netlabel code will handle changing the
1842 * packet labeling based on the label.
1843 * The case of a single label host is different, because
1844 * a single label host should never get a labeled packet
1845 * even though the label is usually associated with a packet
1849 bh_lock_sock_nested(sk);
1851 if (ssp->smk_out == smack_net_ambient ||
1852 labeled == SMACK_UNLABELED_SOCKET)
1853 netlbl_sock_delattr(sk);
1856 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1866 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1868 * @sap: the destination address
1870 * Set the correct secattr for the given socket based on the destination
1871 * address and perform any outbound access checks needed.
1873 * Returns 0 on success or an error code.
1876 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1878 struct smack_known *skp;
1882 struct socket_smack *ssp = sk->sk_security;
1883 struct smk_audit_info ad;
1886 hostsp = smack_host_label(sap);
1887 if (hostsp != NULL) {
1889 struct lsm_network_audit net;
1891 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1892 ad.a.u.net->family = sap->sin_family;
1893 ad.a.u.net->dport = sap->sin_port;
1894 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
1896 sk_lbl = SMACK_UNLABELED_SOCKET;
1898 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
1900 sk_lbl = SMACK_CIPSO_SOCKET;
1907 return smack_netlabel(sk, sk_lbl);
1911 * smk_ipv6_port_label - Smack port access table management
1915 * Create or update the port list entry
1917 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
1919 struct sock *sk = sock->sk;
1920 struct sockaddr_in6 *addr6;
1921 struct socket_smack *ssp = sock->sk->sk_security;
1922 struct smk_port_label *spp;
1923 unsigned short port = 0;
1925 if (address == NULL) {
1927 * This operation is changing the Smack information
1928 * on the bound socket. Take the changes to the port
1931 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1932 if (sk != spp->smk_sock)
1934 spp->smk_in = ssp->smk_in;
1935 spp->smk_out = ssp->smk_out;
1939 * A NULL address is only used for updating existing
1940 * bound entries. If there isn't one, it's OK.
1945 addr6 = (struct sockaddr_in6 *)address;
1946 port = ntohs(addr6->sin6_port);
1948 * This is a special case that is safely ignored.
1954 * Look for an existing port list entry.
1955 * This is an indication that a port is getting reused.
1957 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1958 if (spp->smk_port != port)
1960 spp->smk_port = port;
1962 spp->smk_in = ssp->smk_in;
1963 spp->smk_out = ssp->smk_out;
1968 * A new port entry is required.
1970 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
1974 spp->smk_port = port;
1976 spp->smk_in = ssp->smk_in;
1977 spp->smk_out = ssp->smk_out;
1979 list_add(&spp->list, &smk_ipv6_port_list);
1984 * smk_ipv6_port_check - check Smack port access
1988 * Create or update the port list entry
1990 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
1995 struct smk_port_label *spp;
1996 struct socket_smack *ssp = sk->sk_security;
1997 struct smack_known *skp;
1998 unsigned short port = 0;
2000 struct smk_audit_info ad;
2002 struct lsm_network_audit net;
2005 if (act == SMK_RECEIVING) {
2006 skp = smack_net_ambient;
2007 object = ssp->smk_in;
2010 object = smack_net_ambient->smk_known;
2014 * Get the IP address and port from the address.
2016 port = ntohs(address->sin6_port);
2017 bep = (__be16 *)(&address->sin6_addr);
2018 be32p = (__be32 *)(&address->sin6_addr);
2021 * It's remote, so port lookup does no good.
2023 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2027 * It's local so the send check has to have passed.
2029 if (act == SMK_RECEIVING) {
2030 skp = &smack_known_web;
2034 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2035 if (spp->smk_port != port)
2037 object = spp->smk_in;
2038 if (act == SMK_CONNECTING)
2039 ssp->smk_packet = spp->smk_out->smk_known;
2046 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2047 ad.a.u.net->family = sk->sk_family;
2048 ad.a.u.net->dport = port;
2049 if (act == SMK_RECEIVING)
2050 ad.a.u.net->v6info.saddr = address->sin6_addr;
2052 ad.a.u.net->v6info.daddr = address->sin6_addr;
2054 return smk_access(skp, object, MAY_WRITE, &ad);
2058 * smack_inode_setsecurity - set smack xattrs
2059 * @inode: the object
2060 * @name: attribute name
2061 * @value: attribute value
2062 * @size: size of the attribute
2065 * Sets the named attribute in the appropriate blob
2067 * Returns 0 on success, or an error code
2069 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2070 const void *value, size_t size, int flags)
2072 struct smack_known *skp;
2073 struct inode_smack *nsp = inode->i_security;
2074 struct socket_smack *ssp;
2075 struct socket *sock;
2078 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2081 skp = smk_import_entry(value, size);
2085 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2086 nsp->smk_inode = skp->smk_known;
2087 nsp->smk_flags |= SMK_INODE_INSTANT;
2091 * The rest of the Smack xattrs are only on sockets.
2093 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2096 sock = SOCKET_I(inode);
2097 if (sock == NULL || sock->sk == NULL)
2100 ssp = sock->sk->sk_security;
2102 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2103 ssp->smk_in = skp->smk_known;
2104 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2106 if (sock->sk->sk_family == PF_INET) {
2107 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2110 "Smack: \"%s\" netlbl error %d.\n",
2116 if (sock->sk->sk_family == PF_INET6)
2117 smk_ipv6_port_label(sock, NULL);
2123 * smack_socket_post_create - finish socket setup
2125 * @family: protocol family
2130 * Sets the netlabel information on the socket
2132 * Returns 0 on success, and error code otherwise
2134 static int smack_socket_post_create(struct socket *sock, int family,
2135 int type, int protocol, int kern)
2137 if (family != PF_INET || sock->sk == NULL)
2140 * Set the outbound netlbl.
2142 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2146 * smack_socket_bind - record port binding information.
2148 * @address: the port address
2149 * @addrlen: size of the address
2151 * Records the label bound to a port.
2155 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2158 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2159 smk_ipv6_port_label(sock, address);
2165 * smack_socket_connect - connect access check
2167 * @sap: the other end
2168 * @addrlen: size of sap
2170 * Verifies that a connection may be possible
2172 * Returns 0 on success, and error code otherwise
2174 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2179 if (sock->sk == NULL)
2182 switch (sock->sk->sk_family) {
2184 if (addrlen < sizeof(struct sockaddr_in))
2186 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2189 if (addrlen < sizeof(struct sockaddr_in6))
2191 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2199 * smack_flags_to_may - convert S_ to MAY_ values
2200 * @flags: the S_ value
2202 * Returns the equivalent MAY_ value
2204 static int smack_flags_to_may(int flags)
2208 if (flags & S_IRUGO)
2210 if (flags & S_IWUGO)
2212 if (flags & S_IXUGO)
2219 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2224 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2226 struct smack_known *skp = smk_of_current();
2228 msg->security = skp->smk_known;
2233 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2236 * Clears the blob pointer
2238 static void smack_msg_msg_free_security(struct msg_msg *msg)
2240 msg->security = NULL;
2244 * smack_of_shm - the smack pointer for the shm
2247 * Returns a pointer to the smack value
2249 static char *smack_of_shm(struct shmid_kernel *shp)
2251 return (char *)shp->shm_perm.security;
2255 * smack_shm_alloc_security - Set the security blob for shm
2260 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2262 struct kern_ipc_perm *isp = &shp->shm_perm;
2263 struct smack_known *skp = smk_of_current();
2265 isp->security = skp->smk_known;
2270 * smack_shm_free_security - Clear the security blob for shm
2273 * Clears the blob pointer
2275 static void smack_shm_free_security(struct shmid_kernel *shp)
2277 struct kern_ipc_perm *isp = &shp->shm_perm;
2279 isp->security = NULL;
2283 * smk_curacc_shm : check if current has access on shm
2285 * @access : access requested
2287 * Returns 0 if current has the requested access, error code otherwise
2289 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2291 char *ssp = smack_of_shm(shp);
2292 struct smk_audit_info ad;
2295 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2296 ad.a.u.ipc_id = shp->shm_perm.id;
2298 return smk_curacc(ssp, access, &ad);
2302 * smack_shm_associate - Smack access check for shm
2304 * @shmflg: access requested
2306 * Returns 0 if current has the requested access, error code otherwise
2308 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2312 may = smack_flags_to_may(shmflg);
2313 return smk_curacc_shm(shp, may);
2317 * smack_shm_shmctl - Smack access check for shm
2319 * @cmd: what it wants to do
2321 * Returns 0 if current has the requested access, error code otherwise
2323 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2336 may = MAY_READWRITE;
2341 * System level information.
2347 return smk_curacc_shm(shp, may);
2351 * smack_shm_shmat - Smack access for shmat
2354 * @shmflg: access requested
2356 * Returns 0 if current has the requested access, error code otherwise
2358 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2363 may = smack_flags_to_may(shmflg);
2364 return smk_curacc_shm(shp, may);
2368 * smack_of_sem - the smack pointer for the sem
2371 * Returns a pointer to the smack value
2373 static char *smack_of_sem(struct sem_array *sma)
2375 return (char *)sma->sem_perm.security;
2379 * smack_sem_alloc_security - Set the security blob for sem
2384 static int smack_sem_alloc_security(struct sem_array *sma)
2386 struct kern_ipc_perm *isp = &sma->sem_perm;
2387 struct smack_known *skp = smk_of_current();
2389 isp->security = skp->smk_known;
2394 * smack_sem_free_security - Clear the security blob for sem
2397 * Clears the blob pointer
2399 static void smack_sem_free_security(struct sem_array *sma)
2401 struct kern_ipc_perm *isp = &sma->sem_perm;
2403 isp->security = NULL;
2407 * smk_curacc_sem : check if current has access on sem
2409 * @access : access requested
2411 * Returns 0 if current has the requested access, error code otherwise
2413 static int smk_curacc_sem(struct sem_array *sma, int access)
2415 char *ssp = smack_of_sem(sma);
2416 struct smk_audit_info ad;
2419 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2420 ad.a.u.ipc_id = sma->sem_perm.id;
2422 return smk_curacc(ssp, access, &ad);
2426 * smack_sem_associate - Smack access check for sem
2428 * @semflg: access requested
2430 * Returns 0 if current has the requested access, error code otherwise
2432 static int smack_sem_associate(struct sem_array *sma, int semflg)
2436 may = smack_flags_to_may(semflg);
2437 return smk_curacc_sem(sma, may);
2441 * smack_sem_shmctl - Smack access check for sem
2443 * @cmd: what it wants to do
2445 * Returns 0 if current has the requested access, error code otherwise
2447 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2465 may = MAY_READWRITE;
2470 * System level information
2477 return smk_curacc_sem(sma, may);
2481 * smack_sem_semop - Smack checks of semaphore operations
2487 * Treated as read and write in all cases.
2489 * Returns 0 if access is allowed, error code otherwise
2491 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2492 unsigned nsops, int alter)
2494 return smk_curacc_sem(sma, MAY_READWRITE);
2498 * smack_msg_alloc_security - Set the security blob for msg
2503 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2505 struct kern_ipc_perm *kisp = &msq->q_perm;
2506 struct smack_known *skp = smk_of_current();
2508 kisp->security = skp->smk_known;
2513 * smack_msg_free_security - Clear the security blob for msg
2516 * Clears the blob pointer
2518 static void smack_msg_queue_free_security(struct msg_queue *msq)
2520 struct kern_ipc_perm *kisp = &msq->q_perm;
2522 kisp->security = NULL;
2526 * smack_of_msq - the smack pointer for the msq
2529 * Returns a pointer to the smack value
2531 static char *smack_of_msq(struct msg_queue *msq)
2533 return (char *)msq->q_perm.security;
2537 * smk_curacc_msq : helper to check if current has access on msq
2539 * @access : access requested
2541 * return 0 if current has access, error otherwise
2543 static int smk_curacc_msq(struct msg_queue *msq, int access)
2545 char *msp = smack_of_msq(msq);
2546 struct smk_audit_info ad;
2549 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2550 ad.a.u.ipc_id = msq->q_perm.id;
2552 return smk_curacc(msp, access, &ad);
2556 * smack_msg_queue_associate - Smack access check for msg_queue
2558 * @msqflg: access requested
2560 * Returns 0 if current has the requested access, error code otherwise
2562 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2566 may = smack_flags_to_may(msqflg);
2567 return smk_curacc_msq(msq, may);
2571 * smack_msg_queue_msgctl - Smack access check for msg_queue
2573 * @cmd: what it wants to do
2575 * Returns 0 if current has the requested access, error code otherwise
2577 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2588 may = MAY_READWRITE;
2593 * System level information
2600 return smk_curacc_msq(msq, may);
2604 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2607 * @msqflg: access requested
2609 * Returns 0 if current has the requested access, error code otherwise
2611 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2616 may = smack_flags_to_may(msqflg);
2617 return smk_curacc_msq(msq, may);
2621 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2628 * Returns 0 if current has read and write access, error code otherwise
2630 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2631 struct task_struct *target, long type, int mode)
2633 return smk_curacc_msq(msq, MAY_READWRITE);
2637 * smack_ipc_permission - Smack access for ipc_permission()
2638 * @ipp: the object permissions
2639 * @flag: access requested
2641 * Returns 0 if current has read and write access, error code otherwise
2643 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2645 char *isp = ipp->security;
2646 int may = smack_flags_to_may(flag);
2647 struct smk_audit_info ad;
2650 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2651 ad.a.u.ipc_id = ipp->id;
2653 return smk_curacc(isp, may, &ad);
2657 * smack_ipc_getsecid - Extract smack security id
2658 * @ipp: the object permissions
2659 * @secid: where result will be saved
2661 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2663 char *smack = ipp->security;
2665 *secid = smack_to_secid(smack);
2669 * smack_d_instantiate - Make sure the blob is correct on an inode
2670 * @opt_dentry: dentry where inode will be attached
2671 * @inode: the object
2673 * Set the inode's security blob if it hasn't been done already.
2675 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2677 struct super_block *sbp;
2678 struct superblock_smack *sbsp;
2679 struct inode_smack *isp;
2680 struct smack_known *skp;
2681 struct smack_known *ckp = smk_of_current();
2683 char trattr[TRANS_TRUE_SIZE];
2691 isp = inode->i_security;
2693 mutex_lock(&isp->smk_lock);
2695 * If the inode is already instantiated
2696 * take the quick way out
2698 if (isp->smk_flags & SMK_INODE_INSTANT)
2702 sbsp = sbp->s_security;
2704 * We're going to use the superblock default label
2705 * if there's no label on the file.
2707 final = sbsp->smk_default;
2710 * If this is the root inode the superblock
2711 * may be in the process of initialization.
2712 * If that is the case use the root value out
2713 * of the superblock.
2715 if (opt_dentry->d_parent == opt_dentry) {
2716 isp->smk_inode = sbsp->smk_root;
2717 isp->smk_flags |= SMK_INODE_INSTANT;
2722 * This is pretty hackish.
2723 * Casey says that we shouldn't have to do
2724 * file system specific code, but it does help
2725 * with keeping it simple.
2727 switch (sbp->s_magic) {
2730 * Casey says that it's a little embarrassing
2731 * that the smack file system doesn't do
2732 * extended attributes.
2734 final = smack_known_star.smk_known;
2738 * Casey says pipes are easy (?)
2740 final = smack_known_star.smk_known;
2742 case DEVPTS_SUPER_MAGIC:
2744 * devpts seems content with the label of the task.
2745 * Programs that change smack have to treat the
2748 final = ckp->smk_known;
2752 * Socket access is controlled by the socket
2753 * structures associated with the task involved.
2755 final = smack_known_star.smk_known;
2757 case PROC_SUPER_MAGIC:
2759 * Casey says procfs appears not to care.
2760 * The superblock default suffices.
2765 * Device labels should come from the filesystem,
2766 * but watch out, because they're volitile,
2767 * getting recreated on every reboot.
2769 final = smack_known_star.smk_known;
2773 * If a smack value has been set we want to use it,
2774 * but since tmpfs isn't giving us the opportunity
2775 * to set mount options simulate setting the
2776 * superblock default.
2780 * This isn't an understood special case.
2781 * Get the value from the xattr.
2785 * UNIX domain sockets use lower level socket data.
2787 if (S_ISSOCK(inode->i_mode)) {
2788 final = smack_known_star.smk_known;
2792 * No xattr support means, alas, no SMACK label.
2793 * Use the aforeapplied default.
2794 * It would be curious if the label of the task
2795 * does not match that assigned.
2797 if (inode->i_op->getxattr == NULL)
2800 * Get the dentry for xattr.
2802 dp = dget(opt_dentry);
2803 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2805 final = skp->smk_known;
2808 * Transmuting directory
2810 if (S_ISDIR(inode->i_mode)) {
2812 * If this is a new directory and the label was
2813 * transmuted when the inode was initialized
2814 * set the transmute attribute on the directory
2815 * and mark the inode.
2817 * If there is a transmute attribute on the
2818 * directory mark the inode.
2820 if (isp->smk_flags & SMK_INODE_CHANGED) {
2821 isp->smk_flags &= ~SMK_INODE_CHANGED;
2822 rc = inode->i_op->setxattr(dp,
2823 XATTR_NAME_SMACKTRANSMUTE,
2824 TRANS_TRUE, TRANS_TRUE_SIZE,
2827 rc = inode->i_op->getxattr(dp,
2828 XATTR_NAME_SMACKTRANSMUTE, trattr,
2830 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2831 TRANS_TRUE_SIZE) != 0)
2835 transflag = SMK_INODE_TRANSMUTE;
2838 * Don't let the exec or mmap label be "*" or "@".
2840 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2841 if (skp == &smack_known_star || skp == &smack_known_web)
2843 isp->smk_task = skp;
2844 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2845 if (skp == &smack_known_star || skp == &smack_known_web)
2847 isp->smk_mmap = skp;
2854 isp->smk_inode = ckp->smk_known;
2856 isp->smk_inode = final;
2858 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2861 mutex_unlock(&isp->smk_lock);
2866 * smack_getprocattr - Smack process attribute access
2867 * @p: the object task
2868 * @name: the name of the attribute in /proc/.../attr
2869 * @value: where to put the result
2871 * Places a copy of the task Smack into value
2873 * Returns the length of the smack label or an error code
2875 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2877 struct smack_known *skp = smk_of_task(task_security(p));
2881 if (strcmp(name, "current") != 0)
2884 cp = kstrdup(skp->smk_known, GFP_KERNEL);
2894 * smack_setprocattr - Smack process attribute setting
2895 * @p: the object task
2896 * @name: the name of the attribute in /proc/.../attr
2897 * @value: the value to set
2898 * @size: the size of the value
2900 * Sets the Smack value of the task. Only setting self
2901 * is permitted and only with privilege
2903 * Returns the length of the smack label or an error code
2905 static int smack_setprocattr(struct task_struct *p, char *name,
2906 void *value, size_t size)
2908 struct task_smack *tsp;
2910 struct smack_known *skp;
2913 * Changing another process' Smack value is too dangerous
2914 * and supports no sane use case.
2919 if (!smack_privileged(CAP_MAC_ADMIN))
2922 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2925 if (strcmp(name, "current") != 0)
2928 skp = smk_import_entry(value, size);
2933 * No process is ever allowed the web ("@") label.
2935 if (skp == &smack_known_web)
2938 new = prepare_creds();
2942 tsp = new->security;
2943 tsp->smk_task = skp;
2950 * smack_unix_stream_connect - Smack access on UDS
2952 * @other: the other sock
2955 * Return 0 if a subject with the smack of sock could access
2956 * an object with the smack of other, otherwise an error code
2958 static int smack_unix_stream_connect(struct sock *sock,
2959 struct sock *other, struct sock *newsk)
2961 struct smack_known *skp;
2962 struct socket_smack *ssp = sock->sk_security;
2963 struct socket_smack *osp = other->sk_security;
2964 struct socket_smack *nsp = newsk->sk_security;
2965 struct smk_audit_info ad;
2969 struct lsm_network_audit net;
2971 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2972 smk_ad_setfield_u_net_sk(&ad, other);
2975 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
2977 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
2981 * Cross reference the peer labels for SO_PEERSEC.
2984 nsp->smk_packet = ssp->smk_out->smk_known;
2985 ssp->smk_packet = osp->smk_out->smk_known;
2992 * smack_unix_may_send - Smack access on UDS
2994 * @other: the other socket
2996 * Return 0 if a subject with the smack of sock could access
2997 * an object with the smack of other, otherwise an error code
2999 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3001 struct socket_smack *ssp = sock->sk->sk_security;
3002 struct socket_smack *osp = other->sk->sk_security;
3003 struct smack_known *skp;
3004 struct smk_audit_info ad;
3007 struct lsm_network_audit net;
3009 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3010 smk_ad_setfield_u_net_sk(&ad, other->sk);
3013 if (smack_privileged(CAP_MAC_OVERRIDE))
3017 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
3021 * smack_socket_sendmsg - Smack check based on destination host
3024 * @size: the size of the message
3026 * Return 0 if the current subject can write to the destination host.
3027 * For IPv4 this is only a question if the destination is a single label host.
3028 * For IPv6 this is a check against the label of the port.
3030 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3033 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3034 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3038 * Perfectly reasonable for this to be NULL
3043 switch (sip->sin_family) {
3045 rc = smack_netlabel_send(sock->sk, sip);
3048 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3055 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3056 * @sap: netlabel secattr
3057 * @ssp: socket security information
3059 * Returns a pointer to a Smack label entry found on the label list.
3061 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3062 struct socket_smack *ssp)
3064 struct smack_known *skp;
3069 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3071 * Looks like a CIPSO packet.
3072 * If there are flags but no level netlabel isn't
3073 * behaving the way we expect it to.
3075 * Look it up in the label table
3076 * Without guidance regarding the smack value
3077 * for the packet fall back on the network
3081 list_for_each_entry(skp, &smack_known_list, list) {
3082 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3085 * Compare the catsets. Use the netlbl APIs.
3087 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3088 if ((skp->smk_netlabel.flags &
3089 NETLBL_SECATTR_MLS_CAT) == 0)
3093 for (acat = -1, kcat = -1; acat == kcat; ) {
3094 acat = netlbl_secattr_catmap_walk(
3095 sap->attr.mls.cat, acat + 1);
3096 kcat = netlbl_secattr_catmap_walk(
3097 skp->smk_netlabel.attr.mls.cat,
3099 if (acat < 0 || kcat < 0)
3112 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
3113 return &smack_known_web;
3114 return &smack_known_star;
3116 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3118 * Looks like a fallback, which gives us a secid.
3120 skp = smack_from_secid(sap->attr.secid);
3122 * This has got to be a bug because it is
3123 * impossible to specify a fallback without
3124 * specifying the label, which will ensure
3125 * it has a secid, and the only way to get a
3126 * secid is from a fallback.
3128 BUG_ON(skp == NULL);
3132 * Without guidance regarding the smack value
3133 * for the packet fall back on the network
3136 return smack_net_ambient;
3139 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3143 int proto = -EINVAL;
3144 struct ipv6hdr _ipv6h;
3145 struct ipv6hdr *ip6;
3147 struct tcphdr _tcph, *th;
3148 struct udphdr _udph, *uh;
3149 struct dccp_hdr _dccph, *dh;
3153 offset = skb_network_offset(skb);
3154 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3157 sip->sin6_addr = ip6->saddr;
3159 nexthdr = ip6->nexthdr;
3160 offset += sizeof(_ipv6h);
3161 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3168 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3170 sip->sin6_port = th->source;
3173 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3175 sip->sin6_port = uh->source;
3178 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3180 sip->sin6_port = dh->dccph_sport;
3187 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3191 * Returns 0 if the packet should be delivered, an error code otherwise
3193 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3195 struct netlbl_lsm_secattr secattr;
3196 struct socket_smack *ssp = sk->sk_security;
3197 struct smack_known *skp;
3198 struct sockaddr_in6 sadd;
3200 struct smk_audit_info ad;
3202 struct lsm_network_audit net;
3204 switch (sk->sk_family) {
3207 * Translate what netlabel gave us.
3209 netlbl_secattr_init(&secattr);
3211 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3213 skp = smack_from_secattr(&secattr, ssp);
3215 skp = smack_net_ambient;
3217 netlbl_secattr_destroy(&secattr);
3220 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3221 ad.a.u.net->family = sk->sk_family;
3222 ad.a.u.net->netif = skb->skb_iif;
3223 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3226 * Receiving a packet requires that the other end
3227 * be able to write here. Read access is not required.
3228 * This is the simplist possible security model
3231 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3233 netlbl_skbuff_err(skb, rc, 0);
3236 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3237 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3238 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3247 * smack_socket_getpeersec_stream - pull in packet label
3249 * @optval: user's destination
3250 * @optlen: size thereof
3253 * returns zero on success, an error code otherwise
3255 static int smack_socket_getpeersec_stream(struct socket *sock,
3256 char __user *optval,
3257 int __user *optlen, unsigned len)
3259 struct socket_smack *ssp;
3264 ssp = sock->sk->sk_security;
3265 if (ssp->smk_packet != NULL) {
3266 rcp = ssp->smk_packet;
3267 slen = strlen(rcp) + 1;
3272 else if (copy_to_user(optval, rcp, slen) != 0)
3275 if (put_user(slen, optlen) != 0)
3283 * smack_socket_getpeersec_dgram - pull in packet label
3284 * @sock: the peer socket
3286 * @secid: pointer to where to put the secid of the packet
3288 * Sets the netlabel socket state on sk from parent
3290 static int smack_socket_getpeersec_dgram(struct socket *sock,
3291 struct sk_buff *skb, u32 *secid)
3294 struct netlbl_lsm_secattr secattr;
3295 struct socket_smack *ssp = NULL;
3296 struct smack_known *skp;
3297 int family = PF_UNSPEC;
3298 u32 s = 0; /* 0 is the invalid secid */
3302 if (skb->protocol == htons(ETH_P_IP))
3304 else if (skb->protocol == htons(ETH_P_IPV6))
3307 if (family == PF_UNSPEC && sock != NULL)
3308 family = sock->sk->sk_family;
3310 if (family == PF_UNIX) {
3311 ssp = sock->sk->sk_security;
3312 s = ssp->smk_out->smk_secid;
3313 } else if (family == PF_INET || family == PF_INET6) {
3315 * Translate what netlabel gave us.
3317 if (sock != NULL && sock->sk != NULL)
3318 ssp = sock->sk->sk_security;
3319 netlbl_secattr_init(&secattr);
3320 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3322 skp = smack_from_secattr(&secattr, ssp);
3325 netlbl_secattr_destroy(&secattr);
3334 * smack_sock_graft - Initialize a newly created socket with an existing sock
3336 * @parent: parent socket
3338 * Set the smk_{in,out} state of an existing sock based on the process that
3339 * is creating the new socket.
3341 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3343 struct socket_smack *ssp;
3344 struct smack_known *skp = smk_of_current();
3347 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3350 ssp = sk->sk_security;
3351 ssp->smk_in = skp->smk_known;
3353 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3357 * smack_inet_conn_request - Smack access check on connect
3358 * @sk: socket involved
3362 * Returns 0 if a task with the packet label could write to
3363 * the socket, otherwise an error code
3365 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3366 struct request_sock *req)
3368 u16 family = sk->sk_family;
3369 struct smack_known *skp;
3370 struct socket_smack *ssp = sk->sk_security;
3371 struct netlbl_lsm_secattr secattr;
3372 struct sockaddr_in addr;
3376 struct smk_audit_info ad;
3378 struct lsm_network_audit net;
3381 if (family == PF_INET6) {
3383 * Handle mapped IPv4 packets arriving
3384 * via IPv6 sockets. Don't set up netlabel
3385 * processing on IPv6.
3387 if (skb->protocol == htons(ETH_P_IP))
3393 netlbl_secattr_init(&secattr);
3394 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3396 skp = smack_from_secattr(&secattr, ssp);
3398 skp = &smack_known_huh;
3399 netlbl_secattr_destroy(&secattr);
3402 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3403 ad.a.u.net->family = family;
3404 ad.a.u.net->netif = skb->skb_iif;
3405 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3408 * Receiving a packet requires that the other end be able to write
3409 * here. Read access is not required.
3411 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3416 * Save the peer's label in the request_sock so we can later setup
3417 * smk_packet in the child socket so that SO_PEERCRED can report it.
3419 req->peer_secid = skp->smk_secid;
3422 * We need to decide if we want to label the incoming connection here
3423 * if we do we only need to label the request_sock and the stack will
3424 * propagate the wire-label to the sock when it is created.
3427 addr.sin_addr.s_addr = hdr->saddr;
3429 hsp = smack_host_label(&addr);
3433 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3435 netlbl_req_delattr(req);
3441 * smack_inet_csk_clone - Copy the connection information to the new socket
3442 * @sk: the new socket
3443 * @req: the connection's request_sock
3445 * Transfer the connection's peer label to the newly created socket.
3447 static void smack_inet_csk_clone(struct sock *sk,
3448 const struct request_sock *req)
3450 struct socket_smack *ssp = sk->sk_security;
3451 struct smack_known *skp;
3453 if (req->peer_secid != 0) {
3454 skp = smack_from_secid(req->peer_secid);
3455 ssp->smk_packet = skp->smk_known;
3457 ssp->smk_packet = NULL;
3461 * Key management security hooks
3463 * Casey has not tested key support very heavily.
3464 * The permission check is most likely too restrictive.
3465 * If you care about keys please have a look.
3470 * smack_key_alloc - Set the key security blob
3472 * @cred: the credentials to use
3475 * No allocation required
3479 static int smack_key_alloc(struct key *key, const struct cred *cred,
3480 unsigned long flags)
3482 struct smack_known *skp = smk_of_task(cred->security);
3484 key->security = skp->smk_known;
3489 * smack_key_free - Clear the key security blob
3492 * Clear the blob pointer
3494 static void smack_key_free(struct key *key)
3496 key->security = NULL;
3500 * smack_key_permission - Smack access on a key
3501 * @key_ref: gets to the object
3502 * @cred: the credentials to use
3505 * Return 0 if the task has read and write to the object,
3506 * an error code otherwise
3508 static int smack_key_permission(key_ref_t key_ref,
3509 const struct cred *cred, key_perm_t perm)
3512 struct smk_audit_info ad;
3513 struct smack_known *tkp = smk_of_task(cred->security);
3515 keyp = key_ref_to_ptr(key_ref);
3519 * If the key hasn't been initialized give it access so that
3522 if (keyp->security == NULL)
3525 * This should not occur
3530 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3531 ad.a.u.key_struct.key = keyp->serial;
3532 ad.a.u.key_struct.key_desc = keyp->description;
3534 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
3536 #endif /* CONFIG_KEYS */
3541 * Audit requires a unique representation of each Smack specific
3542 * rule. This unique representation is used to distinguish the
3543 * object to be audited from remaining kernel objects and also
3544 * works as a glue between the audit hooks.
3546 * Since repository entries are added but never deleted, we'll use
3547 * the smack_known label address related to the given audit rule as
3548 * the needed unique representation. This also better fits the smack
3549 * model where nearly everything is a label.
3554 * smack_audit_rule_init - Initialize a smack audit rule
3555 * @field: audit rule fields given from user-space (audit.h)
3556 * @op: required testing operator (=, !=, >, <, ...)
3557 * @rulestr: smack label to be audited
3558 * @vrule: pointer to save our own audit rule representation
3560 * Prepare to audit cases where (@field @op @rulestr) is true.
3561 * The label to be audited is created if necessay.
3563 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3565 char **rule = (char **)vrule;
3568 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3571 if (op != Audit_equal && op != Audit_not_equal)
3574 *rule = smk_import(rulestr, 0);
3580 * smack_audit_rule_known - Distinguish Smack audit rules
3581 * @krule: rule of interest, in Audit kernel representation format
3583 * This is used to filter Smack rules from remaining Audit ones.
3584 * If it's proved that this rule belongs to us, the
3585 * audit_rule_match hook will be called to do the final judgement.
3587 static int smack_audit_rule_known(struct audit_krule *krule)
3589 struct audit_field *f;
3592 for (i = 0; i < krule->field_count; i++) {
3593 f = &krule->fields[i];
3595 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3603 * smack_audit_rule_match - Audit given object ?
3604 * @secid: security id for identifying the object to test
3605 * @field: audit rule flags given from user-space
3606 * @op: required testing operator
3607 * @vrule: smack internal rule presentation
3608 * @actx: audit context associated with the check
3610 * The core Audit hook. It's used to take the decision of
3611 * whether to audit or not to audit a given object.
3613 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3614 struct audit_context *actx)
3616 struct smack_known *skp;
3619 if (unlikely(!rule)) {
3620 WARN_ONCE(1, "Smack: missing rule\n");
3624 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3627 skp = smack_from_secid(secid);
3630 * No need to do string comparisons. If a match occurs,
3631 * both pointers will point to the same smack_known
3634 if (op == Audit_equal)
3635 return (rule == skp->smk_known);
3636 if (op == Audit_not_equal)
3637 return (rule != skp->smk_known);
3643 * smack_audit_rule_free - free smack rule representation
3644 * @vrule: rule to be freed.
3646 * No memory was allocated.
3648 static void smack_audit_rule_free(void *vrule)
3653 #endif /* CONFIG_AUDIT */
3656 * smack_ismaclabel - check if xattr @name references a smack MAC label
3657 * @name: Full xattr name to check.
3659 static int smack_ismaclabel(const char *name)
3661 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
3666 * smack_secid_to_secctx - return the smack label for a secid
3667 * @secid: incoming integer
3668 * @secdata: destination
3669 * @seclen: how long it is
3671 * Exists for networking code.
3673 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3675 struct smack_known *skp = smack_from_secid(secid);
3678 *secdata = skp->smk_known;
3679 *seclen = strlen(skp->smk_known);
3684 * smack_secctx_to_secid - return the secid for a smack label
3685 * @secdata: smack label
3686 * @seclen: how long result is
3687 * @secid: outgoing integer
3689 * Exists for audit and networking code.
3691 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3693 *secid = smack_to_secid(secdata);
3698 * smack_release_secctx - don't do anything.
3702 * Exists to make sure nothing gets done, and properly
3704 static void smack_release_secctx(char *secdata, u32 seclen)
3708 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3710 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3713 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3715 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3718 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3721 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3729 struct security_operations smack_ops = {
3732 .ptrace_access_check = smack_ptrace_access_check,
3733 .ptrace_traceme = smack_ptrace_traceme,
3734 .syslog = smack_syslog,
3736 .sb_alloc_security = smack_sb_alloc_security,
3737 .sb_free_security = smack_sb_free_security,
3738 .sb_copy_data = smack_sb_copy_data,
3739 .sb_kern_mount = smack_sb_kern_mount,
3740 .sb_statfs = smack_sb_statfs,
3742 .bprm_set_creds = smack_bprm_set_creds,
3743 .bprm_committing_creds = smack_bprm_committing_creds,
3744 .bprm_secureexec = smack_bprm_secureexec,
3746 .inode_alloc_security = smack_inode_alloc_security,
3747 .inode_free_security = smack_inode_free_security,
3748 .inode_init_security = smack_inode_init_security,
3749 .inode_link = smack_inode_link,
3750 .inode_unlink = smack_inode_unlink,
3751 .inode_rmdir = smack_inode_rmdir,
3752 .inode_rename = smack_inode_rename,
3753 .inode_permission = smack_inode_permission,
3754 .inode_setattr = smack_inode_setattr,
3755 .inode_getattr = smack_inode_getattr,
3756 .inode_setxattr = smack_inode_setxattr,
3757 .inode_post_setxattr = smack_inode_post_setxattr,
3758 .inode_getxattr = smack_inode_getxattr,
3759 .inode_removexattr = smack_inode_removexattr,
3760 .inode_getsecurity = smack_inode_getsecurity,
3761 .inode_setsecurity = smack_inode_setsecurity,
3762 .inode_listsecurity = smack_inode_listsecurity,
3763 .inode_getsecid = smack_inode_getsecid,
3765 .file_permission = smack_file_permission,
3766 .file_alloc_security = smack_file_alloc_security,
3767 .file_free_security = smack_file_free_security,
3768 .file_ioctl = smack_file_ioctl,
3769 .file_lock = smack_file_lock,
3770 .file_fcntl = smack_file_fcntl,
3771 .mmap_file = smack_mmap_file,
3772 .mmap_addr = cap_mmap_addr,
3773 .file_set_fowner = smack_file_set_fowner,
3774 .file_send_sigiotask = smack_file_send_sigiotask,
3775 .file_receive = smack_file_receive,
3777 .file_open = smack_file_open,
3779 .cred_alloc_blank = smack_cred_alloc_blank,
3780 .cred_free = smack_cred_free,
3781 .cred_prepare = smack_cred_prepare,
3782 .cred_transfer = smack_cred_transfer,
3783 .kernel_act_as = smack_kernel_act_as,
3784 .kernel_create_files_as = smack_kernel_create_files_as,
3785 .task_setpgid = smack_task_setpgid,
3786 .task_getpgid = smack_task_getpgid,
3787 .task_getsid = smack_task_getsid,
3788 .task_getsecid = smack_task_getsecid,
3789 .task_setnice = smack_task_setnice,
3790 .task_setioprio = smack_task_setioprio,
3791 .task_getioprio = smack_task_getioprio,
3792 .task_setscheduler = smack_task_setscheduler,
3793 .task_getscheduler = smack_task_getscheduler,
3794 .task_movememory = smack_task_movememory,
3795 .task_kill = smack_task_kill,
3796 .task_wait = smack_task_wait,
3797 .task_to_inode = smack_task_to_inode,
3799 .ipc_permission = smack_ipc_permission,
3800 .ipc_getsecid = smack_ipc_getsecid,
3802 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3803 .msg_msg_free_security = smack_msg_msg_free_security,
3805 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3806 .msg_queue_free_security = smack_msg_queue_free_security,
3807 .msg_queue_associate = smack_msg_queue_associate,
3808 .msg_queue_msgctl = smack_msg_queue_msgctl,
3809 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3810 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3812 .shm_alloc_security = smack_shm_alloc_security,
3813 .shm_free_security = smack_shm_free_security,
3814 .shm_associate = smack_shm_associate,
3815 .shm_shmctl = smack_shm_shmctl,
3816 .shm_shmat = smack_shm_shmat,
3818 .sem_alloc_security = smack_sem_alloc_security,
3819 .sem_free_security = smack_sem_free_security,
3820 .sem_associate = smack_sem_associate,
3821 .sem_semctl = smack_sem_semctl,
3822 .sem_semop = smack_sem_semop,
3824 .d_instantiate = smack_d_instantiate,
3826 .getprocattr = smack_getprocattr,
3827 .setprocattr = smack_setprocattr,
3829 .unix_stream_connect = smack_unix_stream_connect,
3830 .unix_may_send = smack_unix_may_send,
3832 .socket_post_create = smack_socket_post_create,
3833 .socket_bind = smack_socket_bind,
3834 .socket_connect = smack_socket_connect,
3835 .socket_sendmsg = smack_socket_sendmsg,
3836 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3837 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3838 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3839 .sk_alloc_security = smack_sk_alloc_security,
3840 .sk_free_security = smack_sk_free_security,
3841 .sock_graft = smack_sock_graft,
3842 .inet_conn_request = smack_inet_conn_request,
3843 .inet_csk_clone = smack_inet_csk_clone,
3845 /* key management security hooks */
3847 .key_alloc = smack_key_alloc,
3848 .key_free = smack_key_free,
3849 .key_permission = smack_key_permission,
3850 #endif /* CONFIG_KEYS */
3854 .audit_rule_init = smack_audit_rule_init,
3855 .audit_rule_known = smack_audit_rule_known,
3856 .audit_rule_match = smack_audit_rule_match,
3857 .audit_rule_free = smack_audit_rule_free,
3858 #endif /* CONFIG_AUDIT */
3860 .ismaclabel = smack_ismaclabel,
3861 .secid_to_secctx = smack_secid_to_secctx,
3862 .secctx_to_secid = smack_secctx_to_secid,
3863 .release_secctx = smack_release_secctx,
3864 .inode_notifysecctx = smack_inode_notifysecctx,
3865 .inode_setsecctx = smack_inode_setsecctx,
3866 .inode_getsecctx = smack_inode_getsecctx,
3870 static __init void init_smack_known_list(void)
3873 * Initialize rule list locks
3875 mutex_init(&smack_known_huh.smk_rules_lock);
3876 mutex_init(&smack_known_hat.smk_rules_lock);
3877 mutex_init(&smack_known_floor.smk_rules_lock);
3878 mutex_init(&smack_known_star.smk_rules_lock);
3879 mutex_init(&smack_known_invalid.smk_rules_lock);
3880 mutex_init(&smack_known_web.smk_rules_lock);
3882 * Initialize rule lists
3884 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3885 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3886 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3887 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3888 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3889 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3891 * Create the known labels list
3893 smk_insert_entry(&smack_known_huh);
3894 smk_insert_entry(&smack_known_hat);
3895 smk_insert_entry(&smack_known_star);
3896 smk_insert_entry(&smack_known_floor);
3897 smk_insert_entry(&smack_known_invalid);
3898 smk_insert_entry(&smack_known_web);
3902 * smack_init - initialize the smack system
3906 static __init int smack_init(void)
3909 struct task_smack *tsp;
3911 if (!security_module_enable(&smack_ops))
3914 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
3919 printk(KERN_INFO "Smack: Initializing.\n");
3922 * Set the security state for the initial task.
3924 cred = (struct cred *) current->cred;
3925 cred->security = tsp;
3927 /* initialize the smack_known_list */
3928 init_smack_known_list();
3933 if (register_security(&smack_ops))
3934 panic("smack: Unable to register with kernel.\n");
3939 #ifdef CONFIG_SECURITY_SMACK_PERMISSIVE_MODE
3940 static int __init mode_setup(char *str)
3943 if (!kstrtoul(str, 10, &mode))
3944 permissive_mode = mode ? 1 : 0;
3947 __setup("permissive=", mode_setup);
3951 * Smack requires early initialization in order to label
3952 * all processes and objects when they are created.
3954 security_initcall(smack_init);