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 if (strcmp(name, XATTR_NAME_SMACK) == 0) {
884 skp = smk_import_entry(value, size);
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) {
890 skp = smk_import_entry(value, size);
894 isp->smk_task = &smack_known_invalid;
895 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
896 skp = smk_import_entry(value, size);
900 isp->smk_mmap = &smack_known_invalid;
907 * smack_inode_getxattr - Smack check on getxattr
908 * @dentry: the object
911 * Returns 0 if access is permitted, an error code otherwise
913 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
915 struct smk_audit_info ad;
917 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
918 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
920 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad);
924 * smack_inode_removexattr - Smack check on removexattr
925 * @dentry: the object
926 * @name: name of the attribute
928 * Removing the Smack attribute requires CAP_MAC_ADMIN
930 * Returns 0 if access is permitted, an error code otherwise
932 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
934 struct inode_smack *isp;
935 struct smk_audit_info ad;
938 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
939 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
940 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
941 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
942 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 ||
943 strcmp(name, XATTR_NAME_SMACKMMAP)) {
944 if (!smack_privileged(CAP_MAC_ADMIN))
947 rc = cap_inode_removexattr(dentry, name);
949 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
950 smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
952 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
955 isp = dentry->d_inode->i_security;
956 isp->smk_task = NULL;
957 isp->smk_mmap = NULL;
964 * smack_inode_getsecurity - get smack xattrs
966 * @name: attribute name
967 * @buffer: where to put the result
970 * Returns the size of the attribute or an error code
972 static int smack_inode_getsecurity(const struct inode *inode,
973 const char *name, void **buffer,
976 struct socket_smack *ssp;
978 struct super_block *sbp;
979 struct inode *ip = (struct inode *)inode;
984 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
985 isp = smk_of_inode(inode);
986 ilen = strlen(isp) + 1;
992 * The rest of the Smack xattrs are only on sockets.
995 if (sbp->s_magic != SOCKFS_MAGIC)
999 if (sock == NULL || sock->sk == NULL)
1002 ssp = sock->sk->sk_security;
1004 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1006 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
1007 isp = ssp->smk_out->smk_known;
1011 ilen = strlen(isp) + 1;
1022 * smack_inode_listsecurity - list the Smack attributes
1023 * @inode: the object
1024 * @buffer: where they go
1025 * @buffer_size: size of buffer
1027 * Returns 0 on success, -EINVAL otherwise
1029 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
1032 int len = strlen(XATTR_NAME_SMACK);
1034 if (buffer != NULL && len <= buffer_size) {
1035 memcpy(buffer, XATTR_NAME_SMACK, len);
1042 * smack_inode_getsecid - Extract inode's security id
1043 * @inode: inode to extract the info from
1044 * @secid: where result will be saved
1046 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
1048 struct inode_smack *isp = inode->i_security;
1050 *secid = smack_to_secid(isp->smk_inode);
1058 * smack_file_permission - Smack check on file operations
1064 * Should access checks be done on each read or write?
1065 * UNICOS and SELinux say yes.
1066 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
1068 * I'll say no for now. Smack does not do the frequent
1069 * label changing that SELinux does.
1071 static int smack_file_permission(struct file *file, int mask)
1077 * smack_file_alloc_security - assign a file security blob
1080 * The security blob for a file is a pointer to the master
1081 * label list, so no allocation is done.
1085 static int smack_file_alloc_security(struct file *file)
1087 struct smack_known *skp = smk_of_current();
1089 file->f_security = skp->smk_known;
1094 * smack_file_free_security - clear a file security blob
1097 * The security blob for a file is a pointer to the master
1098 * label list, so no memory is freed.
1100 static void smack_file_free_security(struct file *file)
1102 file->f_security = NULL;
1106 * smack_file_ioctl - Smack check on ioctls
1111 * Relies heavily on the correct use of the ioctl command conventions.
1113 * Returns 0 if allowed, error code otherwise
1115 static int smack_file_ioctl(struct file *file, unsigned int cmd,
1119 struct smk_audit_info ad;
1121 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1122 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1124 if (_IOC_DIR(cmd) & _IOC_WRITE)
1125 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1127 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
1128 rc = smk_curacc(file->f_security, MAY_READ, &ad);
1134 * smack_file_lock - Smack check on file locking
1138 * Returns 0 if current has lock access, error code otherwise
1140 static int smack_file_lock(struct file *file, unsigned int cmd)
1142 struct smk_audit_info ad;
1144 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1145 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1146 return smk_curacc(file->f_security, MAY_LOCK, &ad);
1150 * smack_file_fcntl - Smack check on fcntl
1152 * @cmd: what action to check
1155 * Generally these operations are harmless.
1156 * File locking operations present an obvious mechanism
1157 * for passing information, so they require write access.
1159 * Returns 0 if current has access, error code otherwise
1161 static int smack_file_fcntl(struct file *file, unsigned int cmd,
1164 struct smk_audit_info ad;
1173 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1174 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1175 rc = smk_curacc(file->f_security, MAY_LOCK, &ad);
1179 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1180 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1181 rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
1192 * Check permissions for a mmap operation. The @file may be NULL, e.g.
1193 * if mapping anonymous memory.
1194 * @file contains the file structure for file to map (may be NULL).
1195 * @reqprot contains the protection requested by the application.
1196 * @prot contains the protection that will be applied by the kernel.
1197 * @flags contains the operational flags.
1198 * Return 0 if permission is granted.
1200 static int smack_mmap_file(struct file *file,
1201 unsigned long reqprot, unsigned long prot,
1202 unsigned long flags)
1204 struct smack_known *skp;
1205 struct smack_known *mkp;
1206 struct smack_rule *srp;
1207 struct task_smack *tsp;
1209 struct inode_smack *isp;
1218 isp = file_inode(file)->i_security;
1219 if (isp->smk_mmap == NULL)
1221 mkp = isp->smk_mmap;
1223 tsp = current_security();
1224 skp = smk_of_current();
1229 * For each Smack rule associated with the subject
1230 * label verify that the SMACK64MMAP also has access
1231 * to that rule's object label.
1233 list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
1234 osmack = srp->smk_object;
1236 * Matching labels always allows access.
1238 if (mkp->smk_known == osmack)
1241 * If there is a matching local rule take
1242 * that into account as well.
1244 may = smk_access_entry(srp->smk_subject->smk_known, osmack,
1247 may = srp->smk_access;
1249 may &= srp->smk_access;
1251 * If may is zero the SMACK64MMAP subject can't
1252 * possibly have less access.
1258 * Fetch the global list entry.
1259 * If there isn't one a SMACK64MMAP subject
1260 * can't have as much access as current.
1262 mmay = smk_access_entry(mkp->smk_known, osmack,
1264 if (mmay == -ENOENT) {
1269 * If there is a local entry it modifies the
1270 * potential access, too.
1272 tmay = smk_access_entry(mkp->smk_known, osmack,
1274 if (tmay != -ENOENT)
1278 * If there is any access available to current that is
1279 * not available to a SMACK64MMAP subject
1282 if ((may | mmay) != mmay) {
1294 * smack_file_set_fowner - set the file security blob value
1295 * @file: object in question
1298 * Further research may be required on this one.
1300 static int smack_file_set_fowner(struct file *file)
1302 struct smack_known *skp = smk_of_current();
1304 file->f_security = skp->smk_known;
1309 * smack_file_send_sigiotask - Smack on sigio
1310 * @tsk: The target task
1311 * @fown: the object the signal come from
1314 * Allow a privileged task to get signals even if it shouldn't
1316 * Returns 0 if a subject with the object's smack could
1317 * write to the task, an error code otherwise.
1319 static int smack_file_send_sigiotask(struct task_struct *tsk,
1320 struct fown_struct *fown, int signum)
1322 struct smack_known *skp;
1323 struct smack_known *tkp = smk_of_task(tsk->cred->security);
1326 struct smk_audit_info ad;
1329 * struct fown_struct is never outside the context of a struct file
1331 file = container_of(fown, struct file, f_owner);
1333 /* we don't log here as rc can be overriden */
1334 skp = smk_find_entry(file->f_security);
1335 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL);
1336 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
1339 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1340 smk_ad_setfield_u_tsk(&ad, tsk);
1341 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad);
1346 * smack_file_receive - Smack file receive check
1349 * Returns 0 if current has access, error code otherwise
1351 static int smack_file_receive(struct file *file)
1354 struct smk_audit_info ad;
1356 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
1357 smk_ad_setfield_u_fs_path(&ad, file->f_path);
1359 * This code relies on bitmasks.
1361 if (file->f_mode & FMODE_READ)
1363 if (file->f_mode & FMODE_WRITE)
1366 return smk_curacc(file->f_security, may, &ad);
1370 * smack_file_open - Smack dentry open processing
1374 * Set the security blob in the file structure.
1378 static int smack_file_open(struct file *file, const struct cred *cred)
1380 struct inode_smack *isp = file_inode(file)->i_security;
1382 file->f_security = isp->smk_inode;
1392 * smack_cred_alloc_blank - "allocate" blank task-level security credentials
1393 * @new: the new credentials
1394 * @gfp: the atomicity of any memory allocations
1396 * Prepare a blank set of credentials for modification. This must allocate all
1397 * the memory the LSM module might require such that cred_transfer() can
1398 * complete without error.
1400 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
1402 struct task_smack *tsp;
1404 tsp = new_task_smack(NULL, NULL, gfp);
1408 cred->security = tsp;
1415 * smack_cred_free - "free" task-level security credentials
1416 * @cred: the credentials in question
1419 static void smack_cred_free(struct cred *cred)
1421 struct task_smack *tsp = cred->security;
1422 struct smack_rule *rp;
1423 struct list_head *l;
1424 struct list_head *n;
1428 cred->security = NULL;
1430 list_for_each_safe(l, n, &tsp->smk_rules) {
1431 rp = list_entry(l, struct smack_rule, list);
1432 list_del(&rp->list);
1439 * smack_cred_prepare - prepare new set of credentials for modification
1440 * @new: the new credentials
1441 * @old: the original credentials
1442 * @gfp: the atomicity of any memory allocations
1444 * Prepare a new set of credentials for modification.
1446 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1449 struct task_smack *old_tsp = old->security;
1450 struct task_smack *new_tsp;
1453 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp);
1454 if (new_tsp == NULL)
1457 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
1461 new->security = new_tsp;
1466 * smack_cred_transfer - Transfer the old credentials to the new credentials
1467 * @new: the new credentials
1468 * @old: the original credentials
1470 * Fill in a set of blank credentials from another set of credentials.
1472 static void smack_cred_transfer(struct cred *new, const struct cred *old)
1474 struct task_smack *old_tsp = old->security;
1475 struct task_smack *new_tsp = new->security;
1477 new_tsp->smk_task = old_tsp->smk_task;
1478 new_tsp->smk_forked = old_tsp->smk_task;
1479 mutex_init(&new_tsp->smk_rules_lock);
1480 INIT_LIST_HEAD(&new_tsp->smk_rules);
1483 /* cbs copy rule list */
1487 * smack_kernel_act_as - Set the subjective context in a set of credentials
1488 * @new: points to the set of credentials to be modified.
1489 * @secid: specifies the security ID to be set
1491 * Set the security data for a kernel service.
1493 static int smack_kernel_act_as(struct cred *new, u32 secid)
1495 struct task_smack *new_tsp = new->security;
1496 struct smack_known *skp = smack_from_secid(secid);
1501 new_tsp->smk_task = skp;
1506 * smack_kernel_create_files_as - Set the file creation label in a set of creds
1507 * @new: points to the set of credentials to be modified
1508 * @inode: points to the inode to use as a reference
1510 * Set the file creation context in a set of credentials to the same
1511 * as the objective context of the specified inode
1513 static int smack_kernel_create_files_as(struct cred *new,
1514 struct inode *inode)
1516 struct inode_smack *isp = inode->i_security;
1517 struct task_smack *tsp = new->security;
1519 tsp->smk_forked = smk_find_entry(isp->smk_inode);
1520 tsp->smk_task = tsp->smk_forked;
1525 * smk_curacc_on_task - helper to log task related access
1526 * @p: the task object
1527 * @access: the access requested
1528 * @caller: name of the calling function for audit
1530 * Return 0 if access is permitted
1532 static int smk_curacc_on_task(struct task_struct *p, int access,
1535 struct smk_audit_info ad;
1536 struct smack_known *skp = smk_of_task(task_security(p));
1538 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK);
1539 smk_ad_setfield_u_tsk(&ad, p);
1540 return smk_curacc(skp->smk_known, access, &ad);
1544 * smack_task_setpgid - Smack check on setting pgid
1545 * @p: the task object
1548 * Return 0 if write access is permitted
1550 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1552 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1556 * smack_task_getpgid - Smack access check for getpgid
1557 * @p: the object task
1559 * Returns 0 if current can read the object task, error code otherwise
1561 static int smack_task_getpgid(struct task_struct *p)
1563 return smk_curacc_on_task(p, MAY_READ, __func__);
1567 * smack_task_getsid - Smack access check for getsid
1568 * @p: the object task
1570 * Returns 0 if current can read the object task, error code otherwise
1572 static int smack_task_getsid(struct task_struct *p)
1574 return smk_curacc_on_task(p, MAY_READ, __func__);
1578 * smack_task_getsecid - get the secid of the task
1579 * @p: the object task
1580 * @secid: where to put the result
1582 * Sets the secid to contain a u32 version of the smack label.
1584 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1586 struct smack_known *skp = smk_of_task(task_security(p));
1588 *secid = skp->smk_secid;
1592 * smack_task_setnice - Smack check on setting nice
1593 * @p: the task object
1596 * Return 0 if write access is permitted
1598 static int smack_task_setnice(struct task_struct *p, int nice)
1602 rc = cap_task_setnice(p, nice);
1604 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1609 * smack_task_setioprio - Smack check on setting ioprio
1610 * @p: the task object
1613 * Return 0 if write access is permitted
1615 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1619 rc = cap_task_setioprio(p, ioprio);
1621 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1626 * smack_task_getioprio - Smack check on reading ioprio
1627 * @p: the task object
1629 * Return 0 if read access is permitted
1631 static int smack_task_getioprio(struct task_struct *p)
1633 return smk_curacc_on_task(p, MAY_READ, __func__);
1637 * smack_task_setscheduler - Smack check on setting scheduler
1638 * @p: the task object
1642 * Return 0 if read access is permitted
1644 static int smack_task_setscheduler(struct task_struct *p)
1648 rc = cap_task_setscheduler(p);
1650 rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
1655 * smack_task_getscheduler - Smack check on reading scheduler
1656 * @p: the task object
1658 * Return 0 if read access is permitted
1660 static int smack_task_getscheduler(struct task_struct *p)
1662 return smk_curacc_on_task(p, MAY_READ, __func__);
1666 * smack_task_movememory - Smack check on moving memory
1667 * @p: the task object
1669 * Return 0 if write access is permitted
1671 static int smack_task_movememory(struct task_struct *p)
1673 return smk_curacc_on_task(p, MAY_WRITE, __func__);
1677 * smack_task_kill - Smack check on signal delivery
1678 * @p: the task object
1681 * @secid: identifies the smack to use in lieu of current's
1683 * Return 0 if write access is permitted
1685 * The secid behavior is an artifact of an SELinux hack
1686 * in the USB code. Someday it may go away.
1688 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1691 struct smk_audit_info ad;
1692 struct smack_known *skp;
1693 struct smack_known *tkp = smk_of_task(task_security(p));
1695 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
1696 smk_ad_setfield_u_tsk(&ad, p);
1698 * Sending a signal requires that the sender
1699 * can write the receiver.
1702 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad);
1704 * If the secid isn't 0 we're dealing with some USB IO
1705 * specific behavior. This is not clean. For one thing
1706 * we can't take privilege into account.
1708 skp = smack_from_secid(secid);
1709 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad);
1713 * smack_task_wait - Smack access check for waiting
1714 * @p: task to wait for
1718 static int smack_task_wait(struct task_struct *p)
1721 * Allow the operation to succeed.
1723 * In userless environments (e.g. phones) programs
1724 * get marked with SMACK64EXEC and even if the parent
1725 * and child shouldn't be talking the parent still
1726 * may expect to know when the child exits.
1732 * smack_task_to_inode - copy task smack into the inode blob
1733 * @p: task to copy from
1734 * @inode: inode to copy to
1736 * Sets the smack pointer in the inode security blob
1738 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1740 struct inode_smack *isp = inode->i_security;
1741 struct smack_known *skp = smk_of_task(task_security(p));
1743 isp->smk_inode = skp->smk_known;
1751 * smack_sk_alloc_security - Allocate a socket blob
1754 * @gfp_flags: memory allocation flags
1756 * Assign Smack pointers to current
1758 * Returns 0 on success, -ENOMEM is there's no memory
1760 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1762 struct smack_known *skp = smk_of_current();
1763 struct socket_smack *ssp;
1765 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1769 ssp->smk_in = skp->smk_known;
1771 ssp->smk_packet = NULL;
1773 sk->sk_security = ssp;
1779 * smack_sk_free_security - Free a socket blob
1782 * Clears the blob pointer
1784 static void smack_sk_free_security(struct sock *sk)
1786 kfree(sk->sk_security);
1790 * smack_host_label - check host based restrictions
1791 * @sip: the object end
1793 * looks for host based access restrictions
1795 * This version will only be appropriate for really small sets of single label
1796 * hosts. The caller is responsible for ensuring that the RCU read lock is
1797 * taken before calling this function.
1799 * Returns the label of the far end or NULL if it's not special.
1801 static char *smack_host_label(struct sockaddr_in *sip)
1803 struct smk_netlbladdr *snp;
1804 struct in_addr *siap = &sip->sin_addr;
1806 if (siap->s_addr == 0)
1809 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list)
1811 * we break after finding the first match because
1812 * the list is sorted from longest to shortest mask
1813 * so we have found the most specific match
1815 if ((&snp->smk_host.sin_addr)->s_addr ==
1816 (siap->s_addr & (&snp->smk_mask)->s_addr)) {
1817 /* we have found the special CIPSO option */
1818 if (snp->smk_label == smack_cipso_option)
1820 return snp->smk_label;
1827 * smack_netlabel - Set the secattr on a socket
1829 * @labeled: socket label scheme
1831 * Convert the outbound smack value (smk_out) to a
1832 * secattr and attach it to the socket.
1834 * Returns 0 on success or an error code
1836 static int smack_netlabel(struct sock *sk, int labeled)
1838 struct smack_known *skp;
1839 struct socket_smack *ssp = sk->sk_security;
1843 * Usually the netlabel code will handle changing the
1844 * packet labeling based on the label.
1845 * The case of a single label host is different, because
1846 * a single label host should never get a labeled packet
1847 * even though the label is usually associated with a packet
1851 bh_lock_sock_nested(sk);
1853 if (ssp->smk_out == smack_net_ambient ||
1854 labeled == SMACK_UNLABELED_SOCKET)
1855 netlbl_sock_delattr(sk);
1858 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
1868 * smack_netlbel_send - Set the secattr on a socket and perform access checks
1870 * @sap: the destination address
1872 * Set the correct secattr for the given socket based on the destination
1873 * address and perform any outbound access checks needed.
1875 * Returns 0 on success or an error code.
1878 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
1880 struct smack_known *skp;
1884 struct socket_smack *ssp = sk->sk_security;
1885 struct smk_audit_info ad;
1888 hostsp = smack_host_label(sap);
1889 if (hostsp != NULL) {
1891 struct lsm_network_audit net;
1893 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
1894 ad.a.u.net->family = sap->sin_family;
1895 ad.a.u.net->dport = sap->sin_port;
1896 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
1898 sk_lbl = SMACK_UNLABELED_SOCKET;
1900 rc = smk_access(skp, hostsp, MAY_WRITE, &ad);
1902 sk_lbl = SMACK_CIPSO_SOCKET;
1909 return smack_netlabel(sk, sk_lbl);
1913 * smk_ipv6_port_label - Smack port access table management
1917 * Create or update the port list entry
1919 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
1921 struct sock *sk = sock->sk;
1922 struct sockaddr_in6 *addr6;
1923 struct socket_smack *ssp = sock->sk->sk_security;
1924 struct smk_port_label *spp;
1925 unsigned short port = 0;
1927 if (address == NULL) {
1929 * This operation is changing the Smack information
1930 * on the bound socket. Take the changes to the port
1933 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1934 if (sk != spp->smk_sock)
1936 spp->smk_in = ssp->smk_in;
1937 spp->smk_out = ssp->smk_out;
1941 * A NULL address is only used for updating existing
1942 * bound entries. If there isn't one, it's OK.
1947 addr6 = (struct sockaddr_in6 *)address;
1948 port = ntohs(addr6->sin6_port);
1950 * This is a special case that is safely ignored.
1956 * Look for an existing port list entry.
1957 * This is an indication that a port is getting reused.
1959 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
1960 if (spp->smk_port != port)
1962 spp->smk_port = port;
1964 spp->smk_in = ssp->smk_in;
1965 spp->smk_out = ssp->smk_out;
1970 * A new port entry is required.
1972 spp = kzalloc(sizeof(*spp), GFP_KERNEL);
1976 spp->smk_port = port;
1978 spp->smk_in = ssp->smk_in;
1979 spp->smk_out = ssp->smk_out;
1981 list_add(&spp->list, &smk_ipv6_port_list);
1986 * smk_ipv6_port_check - check Smack port access
1990 * Create or update the port list entry
1992 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
1997 struct smk_port_label *spp;
1998 struct socket_smack *ssp = sk->sk_security;
1999 struct smack_known *skp;
2000 unsigned short port = 0;
2002 struct smk_audit_info ad;
2004 struct lsm_network_audit net;
2007 if (act == SMK_RECEIVING) {
2008 skp = smack_net_ambient;
2009 object = ssp->smk_in;
2012 object = smack_net_ambient->smk_known;
2016 * Get the IP address and port from the address.
2018 port = ntohs(address->sin6_port);
2019 bep = (__be16 *)(&address->sin6_addr);
2020 be32p = (__be32 *)(&address->sin6_addr);
2023 * It's remote, so port lookup does no good.
2025 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1)
2029 * It's local so the send check has to have passed.
2031 if (act == SMK_RECEIVING) {
2032 skp = &smack_known_web;
2036 list_for_each_entry(spp, &smk_ipv6_port_list, list) {
2037 if (spp->smk_port != port)
2039 object = spp->smk_in;
2040 if (act == SMK_CONNECTING)
2041 ssp->smk_packet = spp->smk_out->smk_known;
2048 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2049 ad.a.u.net->family = sk->sk_family;
2050 ad.a.u.net->dport = port;
2051 if (act == SMK_RECEIVING)
2052 ad.a.u.net->v6info.saddr = address->sin6_addr;
2054 ad.a.u.net->v6info.daddr = address->sin6_addr;
2056 return smk_access(skp, object, MAY_WRITE, &ad);
2060 * smack_inode_setsecurity - set smack xattrs
2061 * @inode: the object
2062 * @name: attribute name
2063 * @value: attribute value
2064 * @size: size of the attribute
2067 * Sets the named attribute in the appropriate blob
2069 * Returns 0 on success, or an error code
2071 static int smack_inode_setsecurity(struct inode *inode, const char *name,
2072 const void *value, size_t size, int flags)
2074 struct smack_known *skp;
2075 struct inode_smack *nsp = inode->i_security;
2076 struct socket_smack *ssp;
2077 struct socket *sock;
2080 if (value == NULL || size > SMK_LONGLABEL || size == 0)
2083 skp = smk_import_entry(value, size);
2087 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
2088 nsp->smk_inode = skp->smk_known;
2089 nsp->smk_flags |= SMK_INODE_INSTANT;
2093 * The rest of the Smack xattrs are only on sockets.
2095 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
2098 sock = SOCKET_I(inode);
2099 if (sock == NULL || sock->sk == NULL)
2102 ssp = sock->sk->sk_security;
2104 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
2105 ssp->smk_in = skp->smk_known;
2106 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
2108 if (sock->sk->sk_family == PF_INET) {
2109 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2112 "Smack: \"%s\" netlbl error %d.\n",
2118 if (sock->sk->sk_family == PF_INET6)
2119 smk_ipv6_port_label(sock, NULL);
2125 * smack_socket_post_create - finish socket setup
2127 * @family: protocol family
2132 * Sets the netlabel information on the socket
2134 * Returns 0 on success, and error code otherwise
2136 static int smack_socket_post_create(struct socket *sock, int family,
2137 int type, int protocol, int kern)
2139 if (family != PF_INET || sock->sk == NULL)
2142 * Set the outbound netlbl.
2144 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET);
2148 * smack_socket_bind - record port binding information.
2150 * @address: the port address
2151 * @addrlen: size of the address
2153 * Records the label bound to a port.
2157 static int smack_socket_bind(struct socket *sock, struct sockaddr *address,
2160 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6)
2161 smk_ipv6_port_label(sock, address);
2167 * smack_socket_connect - connect access check
2169 * @sap: the other end
2170 * @addrlen: size of sap
2172 * Verifies that a connection may be possible
2174 * Returns 0 on success, and error code otherwise
2176 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
2181 if (sock->sk == NULL)
2184 switch (sock->sk->sk_family) {
2186 if (addrlen < sizeof(struct sockaddr_in))
2188 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap);
2191 if (addrlen < sizeof(struct sockaddr_in6))
2193 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap,
2201 * smack_flags_to_may - convert S_ to MAY_ values
2202 * @flags: the S_ value
2204 * Returns the equivalent MAY_ value
2206 static int smack_flags_to_may(int flags)
2210 if (flags & S_IRUGO)
2212 if (flags & S_IWUGO)
2214 if (flags & S_IXUGO)
2221 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
2226 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
2228 struct smack_known *skp = smk_of_current();
2230 msg->security = skp->smk_known;
2235 * smack_msg_msg_free_security - Clear the security blob for msg_msg
2238 * Clears the blob pointer
2240 static void smack_msg_msg_free_security(struct msg_msg *msg)
2242 msg->security = NULL;
2246 * smack_of_shm - the smack pointer for the shm
2249 * Returns a pointer to the smack value
2251 static char *smack_of_shm(struct shmid_kernel *shp)
2253 return (char *)shp->shm_perm.security;
2257 * smack_shm_alloc_security - Set the security blob for shm
2262 static int smack_shm_alloc_security(struct shmid_kernel *shp)
2264 struct kern_ipc_perm *isp = &shp->shm_perm;
2265 struct smack_known *skp = smk_of_current();
2267 isp->security = skp->smk_known;
2272 * smack_shm_free_security - Clear the security blob for shm
2275 * Clears the blob pointer
2277 static void smack_shm_free_security(struct shmid_kernel *shp)
2279 struct kern_ipc_perm *isp = &shp->shm_perm;
2281 isp->security = NULL;
2285 * smk_curacc_shm : check if current has access on shm
2287 * @access : access requested
2289 * Returns 0 if current has the requested access, error code otherwise
2291 static int smk_curacc_shm(struct shmid_kernel *shp, int access)
2293 char *ssp = smack_of_shm(shp);
2294 struct smk_audit_info ad;
2297 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2298 ad.a.u.ipc_id = shp->shm_perm.id;
2300 return smk_curacc(ssp, access, &ad);
2304 * smack_shm_associate - Smack access check for shm
2306 * @shmflg: access requested
2308 * Returns 0 if current has the requested access, error code otherwise
2310 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
2314 may = smack_flags_to_may(shmflg);
2315 return smk_curacc_shm(shp, may);
2319 * smack_shm_shmctl - Smack access check for shm
2321 * @cmd: what it wants to do
2323 * Returns 0 if current has the requested access, error code otherwise
2325 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
2338 may = MAY_READWRITE;
2343 * System level information.
2349 return smk_curacc_shm(shp, may);
2353 * smack_shm_shmat - Smack access for shmat
2356 * @shmflg: access requested
2358 * Returns 0 if current has the requested access, error code otherwise
2360 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
2365 may = smack_flags_to_may(shmflg);
2366 return smk_curacc_shm(shp, may);
2370 * smack_of_sem - the smack pointer for the sem
2373 * Returns a pointer to the smack value
2375 static char *smack_of_sem(struct sem_array *sma)
2377 return (char *)sma->sem_perm.security;
2381 * smack_sem_alloc_security - Set the security blob for sem
2386 static int smack_sem_alloc_security(struct sem_array *sma)
2388 struct kern_ipc_perm *isp = &sma->sem_perm;
2389 struct smack_known *skp = smk_of_current();
2391 isp->security = skp->smk_known;
2396 * smack_sem_free_security - Clear the security blob for sem
2399 * Clears the blob pointer
2401 static void smack_sem_free_security(struct sem_array *sma)
2403 struct kern_ipc_perm *isp = &sma->sem_perm;
2405 isp->security = NULL;
2409 * smk_curacc_sem : check if current has access on sem
2411 * @access : access requested
2413 * Returns 0 if current has the requested access, error code otherwise
2415 static int smk_curacc_sem(struct sem_array *sma, int access)
2417 char *ssp = smack_of_sem(sma);
2418 struct smk_audit_info ad;
2421 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2422 ad.a.u.ipc_id = sma->sem_perm.id;
2424 return smk_curacc(ssp, access, &ad);
2428 * smack_sem_associate - Smack access check for sem
2430 * @semflg: access requested
2432 * Returns 0 if current has the requested access, error code otherwise
2434 static int smack_sem_associate(struct sem_array *sma, int semflg)
2438 may = smack_flags_to_may(semflg);
2439 return smk_curacc_sem(sma, may);
2443 * smack_sem_shmctl - Smack access check for sem
2445 * @cmd: what it wants to do
2447 * Returns 0 if current has the requested access, error code otherwise
2449 static int smack_sem_semctl(struct sem_array *sma, int cmd)
2467 may = MAY_READWRITE;
2472 * System level information
2479 return smk_curacc_sem(sma, may);
2483 * smack_sem_semop - Smack checks of semaphore operations
2489 * Treated as read and write in all cases.
2491 * Returns 0 if access is allowed, error code otherwise
2493 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
2494 unsigned nsops, int alter)
2496 return smk_curacc_sem(sma, MAY_READWRITE);
2500 * smack_msg_alloc_security - Set the security blob for msg
2505 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
2507 struct kern_ipc_perm *kisp = &msq->q_perm;
2508 struct smack_known *skp = smk_of_current();
2510 kisp->security = skp->smk_known;
2515 * smack_msg_free_security - Clear the security blob for msg
2518 * Clears the blob pointer
2520 static void smack_msg_queue_free_security(struct msg_queue *msq)
2522 struct kern_ipc_perm *kisp = &msq->q_perm;
2524 kisp->security = NULL;
2528 * smack_of_msq - the smack pointer for the msq
2531 * Returns a pointer to the smack value
2533 static char *smack_of_msq(struct msg_queue *msq)
2535 return (char *)msq->q_perm.security;
2539 * smk_curacc_msq : helper to check if current has access on msq
2541 * @access : access requested
2543 * return 0 if current has access, error otherwise
2545 static int smk_curacc_msq(struct msg_queue *msq, int access)
2547 char *msp = smack_of_msq(msq);
2548 struct smk_audit_info ad;
2551 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2552 ad.a.u.ipc_id = msq->q_perm.id;
2554 return smk_curacc(msp, access, &ad);
2558 * smack_msg_queue_associate - Smack access check for msg_queue
2560 * @msqflg: access requested
2562 * Returns 0 if current has the requested access, error code otherwise
2564 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
2568 may = smack_flags_to_may(msqflg);
2569 return smk_curacc_msq(msq, may);
2573 * smack_msg_queue_msgctl - Smack access check for msg_queue
2575 * @cmd: what it wants to do
2577 * Returns 0 if current has the requested access, error code otherwise
2579 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
2590 may = MAY_READWRITE;
2595 * System level information
2602 return smk_curacc_msq(msq, may);
2606 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2609 * @msqflg: access requested
2611 * Returns 0 if current has the requested access, error code otherwise
2613 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
2618 may = smack_flags_to_may(msqflg);
2619 return smk_curacc_msq(msq, may);
2623 * smack_msg_queue_msgsnd - Smack access check for msg_queue
2630 * Returns 0 if current has read and write access, error code otherwise
2632 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
2633 struct task_struct *target, long type, int mode)
2635 return smk_curacc_msq(msq, MAY_READWRITE);
2639 * smack_ipc_permission - Smack access for ipc_permission()
2640 * @ipp: the object permissions
2641 * @flag: access requested
2643 * Returns 0 if current has read and write access, error code otherwise
2645 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
2647 char *isp = ipp->security;
2648 int may = smack_flags_to_may(flag);
2649 struct smk_audit_info ad;
2652 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
2653 ad.a.u.ipc_id = ipp->id;
2655 return smk_curacc(isp, may, &ad);
2659 * smack_ipc_getsecid - Extract smack security id
2660 * @ipp: the object permissions
2661 * @secid: where result will be saved
2663 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
2665 char *smack = ipp->security;
2667 *secid = smack_to_secid(smack);
2671 * smack_d_instantiate - Make sure the blob is correct on an inode
2672 * @opt_dentry: dentry where inode will be attached
2673 * @inode: the object
2675 * Set the inode's security blob if it hasn't been done already.
2677 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
2679 struct super_block *sbp;
2680 struct superblock_smack *sbsp;
2681 struct inode_smack *isp;
2682 struct smack_known *skp;
2683 struct smack_known *ckp = smk_of_current();
2685 char trattr[TRANS_TRUE_SIZE];
2693 isp = inode->i_security;
2695 mutex_lock(&isp->smk_lock);
2697 * If the inode is already instantiated
2698 * take the quick way out
2700 if (isp->smk_flags & SMK_INODE_INSTANT)
2704 sbsp = sbp->s_security;
2706 * We're going to use the superblock default label
2707 * if there's no label on the file.
2709 final = sbsp->smk_default;
2712 * If this is the root inode the superblock
2713 * may be in the process of initialization.
2714 * If that is the case use the root value out
2715 * of the superblock.
2717 if (opt_dentry->d_parent == opt_dentry) {
2718 if (sbp->s_magic == CGROUP_SUPER_MAGIC) {
2720 * The cgroup filesystem is never mounted,
2721 * so there's no opportunity to set the mount
2724 sbsp->smk_root = smack_known_star.smk_known;
2725 sbsp->smk_default = smack_known_star.smk_known;
2727 isp->smk_inode = sbsp->smk_root;
2728 isp->smk_flags |= SMK_INODE_INSTANT;
2733 * This is pretty hackish.
2734 * Casey says that we shouldn't have to do
2735 * file system specific code, but it does help
2736 * with keeping it simple.
2738 switch (sbp->s_magic) {
2742 case CGROUP_SUPER_MAGIC:
2744 * Casey says that it's a little embarrassing
2745 * that the smack file system doesn't do
2746 * extended attributes.
2748 * Casey says pipes are easy (?)
2750 * Socket access is controlled by the socket
2751 * structures associated with the task involved.
2753 * Cgroupfs is special
2755 final = smack_known_star.smk_known;
2757 case DEVPTS_SUPER_MAGIC:
2759 * devpts seems content with the label of the task.
2760 * Programs that change smack have to treat the
2763 final = ckp->smk_known;
2765 case PROC_SUPER_MAGIC:
2767 * Casey says procfs appears not to care.
2768 * The superblock default suffices.
2773 * Device labels should come from the filesystem,
2774 * but watch out, because they're volitile,
2775 * getting recreated on every reboot.
2777 final = smack_known_star.smk_known;
2781 * If a smack value has been set we want to use it,
2782 * but since tmpfs isn't giving us the opportunity
2783 * to set mount options simulate setting the
2784 * superblock default.
2788 * This isn't an understood special case.
2789 * Get the value from the xattr.
2793 * UNIX domain sockets use lower level socket data.
2795 if (S_ISSOCK(inode->i_mode)) {
2796 final = smack_known_star.smk_known;
2800 * No xattr support means, alas, no SMACK label.
2801 * Use the aforeapplied default.
2802 * It would be curious if the label of the task
2803 * does not match that assigned.
2805 if (inode->i_op->getxattr == NULL)
2808 * Get the dentry for xattr.
2810 dp = dget(opt_dentry);
2811 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
2813 final = skp->smk_known;
2816 * Transmuting directory
2818 if (S_ISDIR(inode->i_mode)) {
2820 * If this is a new directory and the label was
2821 * transmuted when the inode was initialized
2822 * set the transmute attribute on the directory
2823 * and mark the inode.
2825 * If there is a transmute attribute on the
2826 * directory mark the inode.
2828 if (isp->smk_flags & SMK_INODE_CHANGED) {
2829 isp->smk_flags &= ~SMK_INODE_CHANGED;
2830 rc = inode->i_op->setxattr(dp,
2831 XATTR_NAME_SMACKTRANSMUTE,
2832 TRANS_TRUE, TRANS_TRUE_SIZE,
2835 rc = inode->i_op->getxattr(dp,
2836 XATTR_NAME_SMACKTRANSMUTE, trattr,
2838 if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
2839 TRANS_TRUE_SIZE) != 0)
2843 transflag = SMK_INODE_TRANSMUTE;
2846 * Don't let the exec or mmap label be "*" or "@".
2848 skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
2849 if (skp == &smack_known_star || skp == &smack_known_web)
2851 isp->smk_task = skp;
2852 skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
2853 if (skp == &smack_known_star || skp == &smack_known_web)
2855 isp->smk_mmap = skp;
2862 isp->smk_inode = ckp->smk_known;
2864 isp->smk_inode = final;
2866 isp->smk_flags |= (SMK_INODE_INSTANT | transflag);
2869 mutex_unlock(&isp->smk_lock);
2874 * smack_getprocattr - Smack process attribute access
2875 * @p: the object task
2876 * @name: the name of the attribute in /proc/.../attr
2877 * @value: where to put the result
2879 * Places a copy of the task Smack into value
2881 * Returns the length of the smack label or an error code
2883 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2885 struct smack_known *skp = smk_of_task(task_security(p));
2889 if (strcmp(name, "current") != 0)
2892 cp = kstrdup(skp->smk_known, GFP_KERNEL);
2902 * smack_setprocattr - Smack process attribute setting
2903 * @p: the object task
2904 * @name: the name of the attribute in /proc/.../attr
2905 * @value: the value to set
2906 * @size: the size of the value
2908 * Sets the Smack value of the task. Only setting self
2909 * is permitted and only with privilege
2911 * Returns the length of the smack label or an error code
2913 static int smack_setprocattr(struct task_struct *p, char *name,
2914 void *value, size_t size)
2916 struct task_smack *tsp;
2918 struct smack_known *skp;
2921 * Changing another process' Smack value is too dangerous
2922 * and supports no sane use case.
2927 if (!smack_privileged(CAP_MAC_ADMIN))
2930 if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
2933 if (strcmp(name, "current") != 0)
2936 skp = smk_import_entry(value, size);
2941 * No process is ever allowed the web ("@") label.
2943 if (skp == &smack_known_web)
2946 new = prepare_creds();
2950 tsp = new->security;
2951 tsp->smk_task = skp;
2958 * smack_unix_stream_connect - Smack access on UDS
2960 * @other: the other sock
2963 * Return 0 if a subject with the smack of sock could access
2964 * an object with the smack of other, otherwise an error code
2966 static int smack_unix_stream_connect(struct sock *sock,
2967 struct sock *other, struct sock *newsk)
2969 struct smack_known *skp;
2970 struct socket_smack *ssp = sock->sk_security;
2971 struct socket_smack *osp = other->sk_security;
2972 struct socket_smack *nsp = newsk->sk_security;
2973 struct smk_audit_info ad;
2977 struct lsm_network_audit net;
2979 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
2980 smk_ad_setfield_u_net_sk(&ad, other);
2983 if (!smack_privileged(CAP_MAC_OVERRIDE)) {
2985 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
2989 * Cross reference the peer labels for SO_PEERSEC.
2992 nsp->smk_packet = ssp->smk_out->smk_known;
2993 ssp->smk_packet = osp->smk_out->smk_known;
3000 * smack_unix_may_send - Smack access on UDS
3002 * @other: the other socket
3004 * Return 0 if a subject with the smack of sock could access
3005 * an object with the smack of other, otherwise an error code
3007 static int smack_unix_may_send(struct socket *sock, struct socket *other)
3009 struct socket_smack *ssp = sock->sk->sk_security;
3010 struct socket_smack *osp = other->sk->sk_security;
3011 struct smack_known *skp;
3012 struct smk_audit_info ad;
3015 struct lsm_network_audit net;
3017 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3018 smk_ad_setfield_u_net_sk(&ad, other->sk);
3021 if (smack_privileged(CAP_MAC_OVERRIDE))
3025 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad);
3029 * smack_socket_sendmsg - Smack check based on destination host
3032 * @size: the size of the message
3034 * Return 0 if the current subject can write to the destination host.
3035 * For IPv4 this is only a question if the destination is a single label host.
3036 * For IPv6 this is a check against the label of the port.
3038 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3041 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
3042 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
3046 * Perfectly reasonable for this to be NULL
3051 switch (sip->sin_family) {
3053 rc = smack_netlabel_send(sock->sk, sip);
3056 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
3063 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack
3064 * @sap: netlabel secattr
3065 * @ssp: socket security information
3067 * Returns a pointer to a Smack label entry found on the label list.
3069 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
3070 struct socket_smack *ssp)
3072 struct smack_known *skp;
3077 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
3079 * Looks like a CIPSO packet.
3080 * If there are flags but no level netlabel isn't
3081 * behaving the way we expect it to.
3083 * Look it up in the label table
3084 * Without guidance regarding the smack value
3085 * for the packet fall back on the network
3089 list_for_each_entry(skp, &smack_known_list, list) {
3090 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
3093 * Compare the catsets. Use the netlbl APIs.
3095 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
3096 if ((skp->smk_netlabel.flags &
3097 NETLBL_SECATTR_MLS_CAT) == 0)
3101 for (acat = -1, kcat = -1; acat == kcat; ) {
3102 acat = netlbl_secattr_catmap_walk(
3103 sap->attr.mls.cat, acat + 1);
3104 kcat = netlbl_secattr_catmap_walk(
3105 skp->smk_netlabel.attr.mls.cat,
3107 if (acat < 0 || kcat < 0)
3120 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known)
3121 return &smack_known_web;
3122 return &smack_known_star;
3124 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) {
3126 * Looks like a fallback, which gives us a secid.
3128 skp = smack_from_secid(sap->attr.secid);
3130 * This has got to be a bug because it is
3131 * impossible to specify a fallback without
3132 * specifying the label, which will ensure
3133 * it has a secid, and the only way to get a
3134 * secid is from a fallback.
3136 BUG_ON(skp == NULL);
3140 * Without guidance regarding the smack value
3141 * for the packet fall back on the network
3144 return smack_net_ambient;
3147 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
3151 int proto = -EINVAL;
3152 struct ipv6hdr _ipv6h;
3153 struct ipv6hdr *ip6;
3155 struct tcphdr _tcph, *th;
3156 struct udphdr _udph, *uh;
3157 struct dccp_hdr _dccph, *dh;
3161 offset = skb_network_offset(skb);
3162 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3165 sip->sin6_addr = ip6->saddr;
3167 nexthdr = ip6->nexthdr;
3168 offset += sizeof(_ipv6h);
3169 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
3176 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3178 sip->sin6_port = th->source;
3181 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3183 sip->sin6_port = uh->source;
3186 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3188 sip->sin6_port = dh->dccph_sport;
3195 * smack_socket_sock_rcv_skb - Smack packet delivery access check
3199 * Returns 0 if the packet should be delivered, an error code otherwise
3201 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3203 struct netlbl_lsm_secattr secattr;
3204 struct socket_smack *ssp = sk->sk_security;
3205 struct smack_known *skp;
3206 struct sockaddr_in6 sadd;
3208 struct smk_audit_info ad;
3210 struct lsm_network_audit net;
3212 switch (sk->sk_family) {
3215 * Translate what netlabel gave us.
3217 netlbl_secattr_init(&secattr);
3219 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
3221 skp = smack_from_secattr(&secattr, ssp);
3223 skp = smack_net_ambient;
3225 netlbl_secattr_destroy(&secattr);
3228 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3229 ad.a.u.net->family = sk->sk_family;
3230 ad.a.u.net->netif = skb->skb_iif;
3231 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3234 * Receiving a packet requires that the other end
3235 * be able to write here. Read access is not required.
3236 * This is the simplist possible security model
3239 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3241 netlbl_skbuff_err(skb, rc, 0);
3244 rc = smk_skb_to_addr_ipv6(skb, &sadd);
3245 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP)
3246 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
3255 * smack_socket_getpeersec_stream - pull in packet label
3257 * @optval: user's destination
3258 * @optlen: size thereof
3261 * returns zero on success, an error code otherwise
3263 static int smack_socket_getpeersec_stream(struct socket *sock,
3264 char __user *optval,
3265 int __user *optlen, unsigned len)
3267 struct socket_smack *ssp;
3272 ssp = sock->sk->sk_security;
3273 if (ssp->smk_packet != NULL) {
3274 rcp = ssp->smk_packet;
3275 slen = strlen(rcp) + 1;
3280 else if (copy_to_user(optval, rcp, slen) != 0)
3283 if (put_user(slen, optlen) != 0)
3291 * smack_socket_getpeersec_dgram - pull in packet label
3292 * @sock: the peer socket
3294 * @secid: pointer to where to put the secid of the packet
3296 * Sets the netlabel socket state on sk from parent
3298 static int smack_socket_getpeersec_dgram(struct socket *sock,
3299 struct sk_buff *skb, u32 *secid)
3302 struct netlbl_lsm_secattr secattr;
3303 struct socket_smack *ssp = NULL;
3304 struct smack_known *skp;
3305 int family = PF_UNSPEC;
3306 u32 s = 0; /* 0 is the invalid secid */
3310 if (skb->protocol == htons(ETH_P_IP))
3312 else if (skb->protocol == htons(ETH_P_IPV6))
3315 if (family == PF_UNSPEC && sock != NULL)
3316 family = sock->sk->sk_family;
3318 if (family == PF_UNIX) {
3319 ssp = sock->sk->sk_security;
3320 s = ssp->smk_out->smk_secid;
3321 } else if (family == PF_INET || family == PF_INET6) {
3323 * Translate what netlabel gave us.
3325 if (sock != NULL && sock->sk != NULL)
3326 ssp = sock->sk->sk_security;
3327 netlbl_secattr_init(&secattr);
3328 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3330 skp = smack_from_secattr(&secattr, ssp);
3333 netlbl_secattr_destroy(&secattr);
3342 * smack_sock_graft - Initialize a newly created socket with an existing sock
3344 * @parent: parent socket
3346 * Set the smk_{in,out} state of an existing sock based on the process that
3347 * is creating the new socket.
3349 static void smack_sock_graft(struct sock *sk, struct socket *parent)
3351 struct socket_smack *ssp;
3352 struct smack_known *skp = smk_of_current();
3355 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
3358 ssp = sk->sk_security;
3359 ssp->smk_in = skp->smk_known;
3361 /* cssp->smk_packet is already set in smack_inet_csk_clone() */
3365 * smack_inet_conn_request - Smack access check on connect
3366 * @sk: socket involved
3370 * Returns 0 if a task with the packet label could write to
3371 * the socket, otherwise an error code
3373 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
3374 struct request_sock *req)
3376 u16 family = sk->sk_family;
3377 struct smack_known *skp;
3378 struct socket_smack *ssp = sk->sk_security;
3379 struct netlbl_lsm_secattr secattr;
3380 struct sockaddr_in addr;
3384 struct smk_audit_info ad;
3386 struct lsm_network_audit net;
3389 if (family == PF_INET6) {
3391 * Handle mapped IPv4 packets arriving
3392 * via IPv6 sockets. Don't set up netlabel
3393 * processing on IPv6.
3395 if (skb->protocol == htons(ETH_P_IP))
3401 netlbl_secattr_init(&secattr);
3402 rc = netlbl_skbuff_getattr(skb, family, &secattr);
3404 skp = smack_from_secattr(&secattr, ssp);
3406 skp = &smack_known_huh;
3407 netlbl_secattr_destroy(&secattr);
3410 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
3411 ad.a.u.net->family = family;
3412 ad.a.u.net->netif = skb->skb_iif;
3413 ipv4_skb_to_auditdata(skb, &ad.a, NULL);
3416 * Receiving a packet requires that the other end be able to write
3417 * here. Read access is not required.
3419 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
3424 * Save the peer's label in the request_sock so we can later setup
3425 * smk_packet in the child socket so that SO_PEERCRED can report it.
3427 req->peer_secid = skp->smk_secid;
3430 * We need to decide if we want to label the incoming connection here
3431 * if we do we only need to label the request_sock and the stack will
3432 * propagate the wire-label to the sock when it is created.
3435 addr.sin_addr.s_addr = hdr->saddr;
3437 hsp = smack_host_label(&addr);
3441 rc = netlbl_req_setattr(req, &skp->smk_netlabel);
3443 netlbl_req_delattr(req);
3449 * smack_inet_csk_clone - Copy the connection information to the new socket
3450 * @sk: the new socket
3451 * @req: the connection's request_sock
3453 * Transfer the connection's peer label to the newly created socket.
3455 static void smack_inet_csk_clone(struct sock *sk,
3456 const struct request_sock *req)
3458 struct socket_smack *ssp = sk->sk_security;
3459 struct smack_known *skp;
3461 if (req->peer_secid != 0) {
3462 skp = smack_from_secid(req->peer_secid);
3463 ssp->smk_packet = skp->smk_known;
3465 ssp->smk_packet = NULL;
3469 * Key management security hooks
3471 * Casey has not tested key support very heavily.
3472 * The permission check is most likely too restrictive.
3473 * If you care about keys please have a look.
3478 * smack_key_alloc - Set the key security blob
3480 * @cred: the credentials to use
3483 * No allocation required
3487 static int smack_key_alloc(struct key *key, const struct cred *cred,
3488 unsigned long flags)
3490 struct smack_known *skp = smk_of_task(cred->security);
3492 key->security = skp->smk_known;
3497 * smack_key_free - Clear the key security blob
3500 * Clear the blob pointer
3502 static void smack_key_free(struct key *key)
3504 key->security = NULL;
3508 * smack_key_permission - Smack access on a key
3509 * @key_ref: gets to the object
3510 * @cred: the credentials to use
3513 * Return 0 if the task has read and write to the object,
3514 * an error code otherwise
3516 static int smack_key_permission(key_ref_t key_ref,
3517 const struct cred *cred, unsigned perm)
3520 struct smk_audit_info ad;
3521 struct smack_known *tkp = smk_of_task(cred->security);
3523 keyp = key_ref_to_ptr(key_ref);
3527 * If the key hasn't been initialized give it access so that
3530 if (keyp->security == NULL)
3533 * This should not occur
3538 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
3539 ad.a.u.key_struct.key = keyp->serial;
3540 ad.a.u.key_struct.key_desc = keyp->description;
3542 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad);
3544 #endif /* CONFIG_KEYS */
3549 * Audit requires a unique representation of each Smack specific
3550 * rule. This unique representation is used to distinguish the
3551 * object to be audited from remaining kernel objects and also
3552 * works as a glue between the audit hooks.
3554 * Since repository entries are added but never deleted, we'll use
3555 * the smack_known label address related to the given audit rule as
3556 * the needed unique representation. This also better fits the smack
3557 * model where nearly everything is a label.
3562 * smack_audit_rule_init - Initialize a smack audit rule
3563 * @field: audit rule fields given from user-space (audit.h)
3564 * @op: required testing operator (=, !=, >, <, ...)
3565 * @rulestr: smack label to be audited
3566 * @vrule: pointer to save our own audit rule representation
3568 * Prepare to audit cases where (@field @op @rulestr) is true.
3569 * The label to be audited is created if necessay.
3571 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3573 char **rule = (char **)vrule;
3576 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3579 if (op != Audit_equal && op != Audit_not_equal)
3582 *rule = smk_import(rulestr, 0);
3588 * smack_audit_rule_known - Distinguish Smack audit rules
3589 * @krule: rule of interest, in Audit kernel representation format
3591 * This is used to filter Smack rules from remaining Audit ones.
3592 * If it's proved that this rule belongs to us, the
3593 * audit_rule_match hook will be called to do the final judgement.
3595 static int smack_audit_rule_known(struct audit_krule *krule)
3597 struct audit_field *f;
3600 for (i = 0; i < krule->field_count; i++) {
3601 f = &krule->fields[i];
3603 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
3611 * smack_audit_rule_match - Audit given object ?
3612 * @secid: security id for identifying the object to test
3613 * @field: audit rule flags given from user-space
3614 * @op: required testing operator
3615 * @vrule: smack internal rule presentation
3616 * @actx: audit context associated with the check
3618 * The core Audit hook. It's used to take the decision of
3619 * whether to audit or not to audit a given object.
3621 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
3622 struct audit_context *actx)
3624 struct smack_known *skp;
3627 if (unlikely(!rule)) {
3628 WARN_ONCE(1, "Smack: missing rule\n");
3632 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
3635 skp = smack_from_secid(secid);
3638 * No need to do string comparisons. If a match occurs,
3639 * both pointers will point to the same smack_known
3642 if (op == Audit_equal)
3643 return (rule == skp->smk_known);
3644 if (op == Audit_not_equal)
3645 return (rule != skp->smk_known);
3651 * smack_audit_rule_free - free smack rule representation
3652 * @vrule: rule to be freed.
3654 * No memory was allocated.
3656 static void smack_audit_rule_free(void *vrule)
3661 #endif /* CONFIG_AUDIT */
3664 * smack_ismaclabel - check if xattr @name references a smack MAC label
3665 * @name: Full xattr name to check.
3667 static int smack_ismaclabel(const char *name)
3669 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
3674 * smack_secid_to_secctx - return the smack label for a secid
3675 * @secid: incoming integer
3676 * @secdata: destination
3677 * @seclen: how long it is
3679 * Exists for networking code.
3681 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
3683 struct smack_known *skp = smack_from_secid(secid);
3686 *secdata = skp->smk_known;
3687 *seclen = strlen(skp->smk_known);
3692 * smack_secctx_to_secid - return the secid for a smack label
3693 * @secdata: smack label
3694 * @seclen: how long result is
3695 * @secid: outgoing integer
3697 * Exists for audit and networking code.
3699 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
3701 *secid = smack_to_secid(secdata);
3706 * smack_release_secctx - don't do anything.
3710 * Exists to make sure nothing gets done, and properly
3712 static void smack_release_secctx(char *secdata, u32 seclen)
3716 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
3718 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0);
3721 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
3723 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0);
3726 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
3729 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true);
3737 struct security_operations smack_ops = {
3740 .ptrace_access_check = smack_ptrace_access_check,
3741 .ptrace_traceme = smack_ptrace_traceme,
3742 .syslog = smack_syslog,
3744 .sb_alloc_security = smack_sb_alloc_security,
3745 .sb_free_security = smack_sb_free_security,
3746 .sb_copy_data = smack_sb_copy_data,
3747 .sb_kern_mount = smack_sb_kern_mount,
3748 .sb_statfs = smack_sb_statfs,
3750 .bprm_set_creds = smack_bprm_set_creds,
3751 .bprm_committing_creds = smack_bprm_committing_creds,
3752 .bprm_secureexec = smack_bprm_secureexec,
3754 .inode_alloc_security = smack_inode_alloc_security,
3755 .inode_free_security = smack_inode_free_security,
3756 .inode_init_security = smack_inode_init_security,
3757 .inode_link = smack_inode_link,
3758 .inode_unlink = smack_inode_unlink,
3759 .inode_rmdir = smack_inode_rmdir,
3760 .inode_rename = smack_inode_rename,
3761 .inode_permission = smack_inode_permission,
3762 .inode_setattr = smack_inode_setattr,
3763 .inode_getattr = smack_inode_getattr,
3764 .inode_setxattr = smack_inode_setxattr,
3765 .inode_post_setxattr = smack_inode_post_setxattr,
3766 .inode_getxattr = smack_inode_getxattr,
3767 .inode_removexattr = smack_inode_removexattr,
3768 .inode_getsecurity = smack_inode_getsecurity,
3769 .inode_setsecurity = smack_inode_setsecurity,
3770 .inode_listsecurity = smack_inode_listsecurity,
3771 .inode_getsecid = smack_inode_getsecid,
3773 .file_permission = smack_file_permission,
3774 .file_alloc_security = smack_file_alloc_security,
3775 .file_free_security = smack_file_free_security,
3776 .file_ioctl = smack_file_ioctl,
3777 .file_lock = smack_file_lock,
3778 .file_fcntl = smack_file_fcntl,
3779 .mmap_file = smack_mmap_file,
3780 .mmap_addr = cap_mmap_addr,
3781 .file_set_fowner = smack_file_set_fowner,
3782 .file_send_sigiotask = smack_file_send_sigiotask,
3783 .file_receive = smack_file_receive,
3785 .file_open = smack_file_open,
3787 .cred_alloc_blank = smack_cred_alloc_blank,
3788 .cred_free = smack_cred_free,
3789 .cred_prepare = smack_cred_prepare,
3790 .cred_transfer = smack_cred_transfer,
3791 .kernel_act_as = smack_kernel_act_as,
3792 .kernel_create_files_as = smack_kernel_create_files_as,
3793 .task_setpgid = smack_task_setpgid,
3794 .task_getpgid = smack_task_getpgid,
3795 .task_getsid = smack_task_getsid,
3796 .task_getsecid = smack_task_getsecid,
3797 .task_setnice = smack_task_setnice,
3798 .task_setioprio = smack_task_setioprio,
3799 .task_getioprio = smack_task_getioprio,
3800 .task_setscheduler = smack_task_setscheduler,
3801 .task_getscheduler = smack_task_getscheduler,
3802 .task_movememory = smack_task_movememory,
3803 .task_kill = smack_task_kill,
3804 .task_wait = smack_task_wait,
3805 .task_to_inode = smack_task_to_inode,
3807 .ipc_permission = smack_ipc_permission,
3808 .ipc_getsecid = smack_ipc_getsecid,
3810 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
3811 .msg_msg_free_security = smack_msg_msg_free_security,
3813 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
3814 .msg_queue_free_security = smack_msg_queue_free_security,
3815 .msg_queue_associate = smack_msg_queue_associate,
3816 .msg_queue_msgctl = smack_msg_queue_msgctl,
3817 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
3818 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
3820 .shm_alloc_security = smack_shm_alloc_security,
3821 .shm_free_security = smack_shm_free_security,
3822 .shm_associate = smack_shm_associate,
3823 .shm_shmctl = smack_shm_shmctl,
3824 .shm_shmat = smack_shm_shmat,
3826 .sem_alloc_security = smack_sem_alloc_security,
3827 .sem_free_security = smack_sem_free_security,
3828 .sem_associate = smack_sem_associate,
3829 .sem_semctl = smack_sem_semctl,
3830 .sem_semop = smack_sem_semop,
3832 .d_instantiate = smack_d_instantiate,
3834 .getprocattr = smack_getprocattr,
3835 .setprocattr = smack_setprocattr,
3837 .unix_stream_connect = smack_unix_stream_connect,
3838 .unix_may_send = smack_unix_may_send,
3840 .socket_post_create = smack_socket_post_create,
3841 .socket_bind = smack_socket_bind,
3842 .socket_connect = smack_socket_connect,
3843 .socket_sendmsg = smack_socket_sendmsg,
3844 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
3845 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
3846 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
3847 .sk_alloc_security = smack_sk_alloc_security,
3848 .sk_free_security = smack_sk_free_security,
3849 .sock_graft = smack_sock_graft,
3850 .inet_conn_request = smack_inet_conn_request,
3851 .inet_csk_clone = smack_inet_csk_clone,
3853 /* key management security hooks */
3855 .key_alloc = smack_key_alloc,
3856 .key_free = smack_key_free,
3857 .key_permission = smack_key_permission,
3858 #endif /* CONFIG_KEYS */
3862 .audit_rule_init = smack_audit_rule_init,
3863 .audit_rule_known = smack_audit_rule_known,
3864 .audit_rule_match = smack_audit_rule_match,
3865 .audit_rule_free = smack_audit_rule_free,
3866 #endif /* CONFIG_AUDIT */
3868 .ismaclabel = smack_ismaclabel,
3869 .secid_to_secctx = smack_secid_to_secctx,
3870 .secctx_to_secid = smack_secctx_to_secid,
3871 .release_secctx = smack_release_secctx,
3872 .inode_notifysecctx = smack_inode_notifysecctx,
3873 .inode_setsecctx = smack_inode_setsecctx,
3874 .inode_getsecctx = smack_inode_getsecctx,
3878 static __init void init_smack_known_list(void)
3881 * Initialize rule list locks
3883 mutex_init(&smack_known_huh.smk_rules_lock);
3884 mutex_init(&smack_known_hat.smk_rules_lock);
3885 mutex_init(&smack_known_floor.smk_rules_lock);
3886 mutex_init(&smack_known_star.smk_rules_lock);
3887 mutex_init(&smack_known_invalid.smk_rules_lock);
3888 mutex_init(&smack_known_web.smk_rules_lock);
3890 * Initialize rule lists
3892 INIT_LIST_HEAD(&smack_known_huh.smk_rules);
3893 INIT_LIST_HEAD(&smack_known_hat.smk_rules);
3894 INIT_LIST_HEAD(&smack_known_star.smk_rules);
3895 INIT_LIST_HEAD(&smack_known_floor.smk_rules);
3896 INIT_LIST_HEAD(&smack_known_invalid.smk_rules);
3897 INIT_LIST_HEAD(&smack_known_web.smk_rules);
3899 * Create the known labels list
3901 smk_insert_entry(&smack_known_huh);
3902 smk_insert_entry(&smack_known_hat);
3903 smk_insert_entry(&smack_known_star);
3904 smk_insert_entry(&smack_known_floor);
3905 smk_insert_entry(&smack_known_invalid);
3906 smk_insert_entry(&smack_known_web);
3910 * smack_init - initialize the smack system
3914 static __init int smack_init(void)
3917 struct task_smack *tsp;
3919 if (!security_module_enable(&smack_ops))
3922 tsp = new_task_smack(&smack_known_floor, &smack_known_floor,
3927 printk(KERN_INFO "Smack: Initializing.\n");
3930 * Set the security state for the initial task.
3932 cred = (struct cred *) current->cred;
3933 cred->security = tsp;
3935 /* initialize the smack_known_list */
3936 init_smack_known_list();
3941 if (register_security(&smack_ops))
3942 panic("smack: Unable to register with kernel.\n");
3948 * Smack requires early initialization in order to label
3949 * all processes and objects when they are created.
3951 security_initcall(smack_init);