2 * Simplified MAC Kernel (smack) security module
4 * This file contains the smack hook function implementations.
7 * Casey Schaufler <casey@schaufler-ca.com>
9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2,
13 * as published by the Free Software Foundation.
16 #include <linux/xattr.h>
17 #include <linux/pagemap.h>
18 #include <linux/mount.h>
19 #include <linux/stat.h>
20 #include <linux/ext2_fs.h>
22 #include <asm/ioctls.h>
23 #include <linux/tcp.h>
24 #include <linux/udp.h>
25 #include <linux/mutex.h>
26 #include <linux/pipe_fs_i.h>
27 #include <net/netlabel.h>
28 #include <net/cipso_ipv4.h>
29 #include <linux/audit.h>
34 * I hope these are the hokeyist lines of code in the module. Casey.
36 #define DEVPTS_SUPER_MAGIC 0x1cd1
37 #define SOCKFS_MAGIC 0x534F434B
38 #define TMPFS_MAGIC 0x01021994
41 * smk_fetch - Fetch the smack label from a file.
42 * @ip: a pointer to the inode
43 * @dp: a pointer to the dentry
45 * Returns a pointer to the master list entry for the Smack label
46 * or NULL if there was no label to fetch.
48 static char *smk_fetch(struct inode *ip, struct dentry *dp)
51 char in[SMK_LABELLEN];
53 if (ip->i_op->getxattr == NULL)
56 rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
60 return smk_import(in, rc);
64 * new_inode_smack - allocate an inode security blob
65 * @smack: a pointer to the Smack label to use in the blob
67 * Returns the new blob or NULL if there's no memory available
69 struct inode_smack *new_inode_smack(char *smack)
71 struct inode_smack *isp;
73 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
77 isp->smk_inode = smack;
79 mutex_init(&isp->smk_lock);
90 * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH
91 * @ctp: child task pointer
93 * Returns 0 if access is OK, an error code otherwise
95 * Do the capability checks, and require read and write.
97 static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode)
101 rc = cap_ptrace_may_access(ctp, mode);
105 rc = smk_access(current->security, ctp->security, MAY_READWRITE);
106 if (rc != 0 && capable(CAP_MAC_OVERRIDE))
112 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
113 * @ptp: parent task pointer
115 * Returns 0 if access is OK, an error code otherwise
117 * Do the capability checks, and require read and write.
119 static int smack_ptrace_traceme(struct task_struct *ptp)
123 rc = cap_ptrace_traceme(ptp);
127 rc = smk_access(ptp->security, current->security, MAY_READWRITE);
128 if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
134 * smack_syslog - Smack approval on syslog
135 * @type: message type
137 * Require that the task has the floor label
139 * Returns 0 on success, error code otherwise.
141 static int smack_syslog(int type)
144 char *sp = current->security;
146 rc = cap_syslog(type);
150 if (capable(CAP_MAC_OVERRIDE))
153 if (sp != smack_known_floor.smk_known)
165 * smack_sb_alloc_security - allocate a superblock blob
166 * @sb: the superblock getting the blob
168 * Returns 0 on success or -ENOMEM on error.
170 static int smack_sb_alloc_security(struct super_block *sb)
172 struct superblock_smack *sbsp;
174 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
179 sbsp->smk_root = smack_known_floor.smk_known;
180 sbsp->smk_default = smack_known_floor.smk_known;
181 sbsp->smk_floor = smack_known_floor.smk_known;
182 sbsp->smk_hat = smack_known_hat.smk_known;
183 sbsp->smk_initialized = 0;
184 spin_lock_init(&sbsp->smk_sblock);
186 sb->s_security = sbsp;
192 * smack_sb_free_security - free a superblock blob
193 * @sb: the superblock getting the blob
196 static void smack_sb_free_security(struct super_block *sb)
198 kfree(sb->s_security);
199 sb->s_security = NULL;
203 * smack_sb_copy_data - copy mount options data for processing
204 * @type: file system type
205 * @orig: where to start
208 * Returns 0 on success or -ENOMEM on error.
210 * Copy the Smack specific mount options out of the mount
213 static int smack_sb_copy_data(char *orig, char *smackopts)
215 char *cp, *commap, *otheropts, *dp;
217 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
218 if (otheropts == NULL)
221 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
222 if (strstr(cp, SMK_FSDEFAULT) == cp)
224 else if (strstr(cp, SMK_FSFLOOR) == cp)
226 else if (strstr(cp, SMK_FSHAT) == cp)
228 else if (strstr(cp, SMK_FSROOT) == cp)
233 commap = strchr(cp, ',');
242 strcpy(orig, otheropts);
243 free_page((unsigned long)otheropts);
249 * smack_sb_kern_mount - Smack specific mount processing
250 * @sb: the file system superblock
251 * @data: the smack mount options
253 * Returns 0 on success, an error code on failure
255 static int smack_sb_kern_mount(struct super_block *sb, void *data)
257 struct dentry *root = sb->s_root;
258 struct inode *inode = root->d_inode;
259 struct superblock_smack *sp = sb->s_security;
260 struct inode_smack *isp;
265 spin_lock(&sp->smk_sblock);
266 if (sp->smk_initialized != 0) {
267 spin_unlock(&sp->smk_sblock);
270 sp->smk_initialized = 1;
271 spin_unlock(&sp->smk_sblock);
273 for (op = data; op != NULL; op = commap) {
274 commap = strchr(op, ',');
278 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
279 op += strlen(SMK_FSHAT);
280 nsp = smk_import(op, 0);
283 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
284 op += strlen(SMK_FSFLOOR);
285 nsp = smk_import(op, 0);
288 } else if (strncmp(op, SMK_FSDEFAULT,
289 strlen(SMK_FSDEFAULT)) == 0) {
290 op += strlen(SMK_FSDEFAULT);
291 nsp = smk_import(op, 0);
293 sp->smk_default = nsp;
294 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
295 op += strlen(SMK_FSROOT);
296 nsp = smk_import(op, 0);
303 * Initialize the root inode.
305 isp = inode->i_security;
307 inode->i_security = new_inode_smack(sp->smk_root);
309 isp->smk_inode = sp->smk_root;
315 * smack_sb_statfs - Smack check on statfs
316 * @dentry: identifies the file system in question
318 * Returns 0 if current can read the floor of the filesystem,
319 * and error code otherwise
321 static int smack_sb_statfs(struct dentry *dentry)
323 struct superblock_smack *sbp = dentry->d_sb->s_security;
325 return smk_curacc(sbp->smk_floor, MAY_READ);
329 * smack_sb_mount - Smack check for mounting
336 * Returns 0 if current can write the floor of the filesystem
337 * being mounted on, an error code otherwise.
339 static int smack_sb_mount(char *dev_name, struct path *path,
340 char *type, unsigned long flags, void *data)
342 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
344 return smk_curacc(sbp->smk_floor, MAY_WRITE);
348 * smack_sb_umount - Smack check for unmounting
349 * @mnt: file system to unmount
352 * Returns 0 if current can write the floor of the filesystem
353 * being unmounted, an error code otherwise.
355 static int smack_sb_umount(struct vfsmount *mnt, int flags)
357 struct superblock_smack *sbp;
359 sbp = mnt->mnt_sb->s_security;
361 return smk_curacc(sbp->smk_floor, MAY_WRITE);
369 * smack_inode_alloc_security - allocate an inode blob
370 * @inode - the inode in need of a blob
372 * Returns 0 if it gets a blob, -ENOMEM otherwise
374 static int smack_inode_alloc_security(struct inode *inode)
376 inode->i_security = new_inode_smack(current->security);
377 if (inode->i_security == NULL)
383 * smack_inode_free_security - free an inode blob
384 * @inode - the inode with a blob
386 * Clears the blob pointer in inode
388 static void smack_inode_free_security(struct inode *inode)
390 kfree(inode->i_security);
391 inode->i_security = NULL;
395 * smack_inode_init_security - copy out the smack from an inode
398 * @name: where to put the attribute name
399 * @value: where to put the attribute value
400 * @len: where to put the length of the attribute
402 * Returns 0 if it all works out, -ENOMEM if there's no memory
404 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
405 char **name, void **value, size_t *len)
407 char *isp = smk_of_inode(inode);
410 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
416 *value = kstrdup(isp, GFP_KERNEL);
422 *len = strlen(isp) + 1;
428 * smack_inode_link - Smack check on link
429 * @old_dentry: the existing object
431 * @new_dentry: the new object
433 * Returns 0 if access is permitted, an error code otherwise
435 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
436 struct dentry *new_dentry)
441 isp = smk_of_inode(old_dentry->d_inode);
442 rc = smk_curacc(isp, MAY_WRITE);
444 if (rc == 0 && new_dentry->d_inode != NULL) {
445 isp = smk_of_inode(new_dentry->d_inode);
446 rc = smk_curacc(isp, MAY_WRITE);
453 * smack_inode_unlink - Smack check on inode deletion
454 * @dir: containing directory object
455 * @dentry: file to unlink
457 * Returns 0 if current can write the containing directory
458 * and the object, error code otherwise
460 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
462 struct inode *ip = dentry->d_inode;
466 * You need write access to the thing you're unlinking
468 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE);
471 * You also need write access to the containing directory
473 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
479 * smack_inode_rmdir - Smack check on directory deletion
480 * @dir: containing directory object
481 * @dentry: directory to unlink
483 * Returns 0 if current can write the containing directory
484 * and the directory, error code otherwise
486 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
491 * You need write access to the thing you're removing
493 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
496 * You also need write access to the containing directory
498 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
504 * smack_inode_rename - Smack check on rename
505 * @old_inode: the old directory
506 * @old_dentry: unused
507 * @new_inode: the new directory
508 * @new_dentry: unused
510 * Read and write access is required on both the old and
513 * Returns 0 if access is permitted, an error code otherwise
515 static int smack_inode_rename(struct inode *old_inode,
516 struct dentry *old_dentry,
517 struct inode *new_inode,
518 struct dentry *new_dentry)
523 isp = smk_of_inode(old_dentry->d_inode);
524 rc = smk_curacc(isp, MAY_READWRITE);
526 if (rc == 0 && new_dentry->d_inode != NULL) {
527 isp = smk_of_inode(new_dentry->d_inode);
528 rc = smk_curacc(isp, MAY_READWRITE);
535 * smack_inode_permission - Smack version of permission()
536 * @inode: the inode in question
537 * @mask: the access requested
540 * This is the important Smack hook.
542 * Returns 0 if access is permitted, -EACCES otherwise
544 static int smack_inode_permission(struct inode *inode, int mask)
547 * No permission to check. Existence test. Yup, it's there.
552 return smk_curacc(smk_of_inode(inode), mask);
556 * smack_inode_setattr - Smack check for setting attributes
557 * @dentry: the object
558 * @iattr: for the force flag
560 * Returns 0 if access is permitted, an error code otherwise
562 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
565 * Need to allow for clearing the setuid bit.
567 if (iattr->ia_valid & ATTR_FORCE)
570 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
574 * smack_inode_getattr - Smack check for getting attributes
576 * @dentry: the object
578 * Returns 0 if access is permitted, an error code otherwise
580 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
582 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
586 * smack_inode_setxattr - Smack check for setting xattrs
587 * @dentry: the object
588 * @name: name of the attribute
593 * This protects the Smack attribute explicitly.
595 * Returns 0 if access is permitted, an error code otherwise
597 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
598 const void *value, size_t size, int flags)
602 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
603 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
604 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
605 if (!capable(CAP_MAC_ADMIN))
608 rc = cap_inode_setxattr(dentry, name, value, size, flags);
611 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
617 * smack_inode_post_setxattr - Apply the Smack update approved above
619 * @name: attribute name
620 * @value: attribute value
621 * @size: attribute size
624 * Set the pointer in the inode blob to the entry found
625 * in the master label list.
627 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
628 const void *value, size_t size, int flags)
630 struct inode_smack *isp;
636 if (strcmp(name, XATTR_NAME_SMACK))
639 if (size >= SMK_LABELLEN)
642 isp = dentry->d_inode->i_security;
645 * No locking is done here. This is a pointer
648 nsp = smk_import(value, size);
650 isp->smk_inode = nsp;
652 isp->smk_inode = smack_known_invalid.smk_known;
658 * smack_inode_getxattr - Smack check on getxattr
659 * @dentry: the object
662 * Returns 0 if access is permitted, an error code otherwise
664 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
666 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
670 * smack_inode_removexattr - Smack check on removexattr
671 * @dentry: the object
672 * @name: name of the attribute
674 * Removing the Smack attribute requires CAP_MAC_ADMIN
676 * Returns 0 if access is permitted, an error code otherwise
678 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
682 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
683 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
684 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
685 if (!capable(CAP_MAC_ADMIN))
688 rc = cap_inode_removexattr(dentry, name);
691 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
697 * smack_inode_getsecurity - get smack xattrs
699 * @name: attribute name
700 * @buffer: where to put the result
701 * @size: size of the buffer
704 * Returns the size of the attribute or an error code
706 static int smack_inode_getsecurity(const struct inode *inode,
707 const char *name, void **buffer,
710 struct socket_smack *ssp;
712 struct super_block *sbp;
713 struct inode *ip = (struct inode *)inode;
718 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
719 isp = smk_of_inode(inode);
720 ilen = strlen(isp) + 1;
726 * The rest of the Smack xattrs are only on sockets.
729 if (sbp->s_magic != SOCKFS_MAGIC)
733 if (sock == NULL || sock->sk == NULL)
736 ssp = sock->sk->sk_security;
738 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
740 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
745 ilen = strlen(isp) + 1;
756 * smack_inode_listsecurity - list the Smack attributes
758 * @buffer: where they go
759 * @buffer_size: size of buffer
761 * Returns 0 on success, -EINVAL otherwise
763 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
766 int len = strlen(XATTR_NAME_SMACK);
768 if (buffer != NULL && len <= buffer_size) {
769 memcpy(buffer, XATTR_NAME_SMACK, len);
776 * smack_inode_getsecid - Extract inode's security id
777 * @inode: inode to extract the info from
778 * @secid: where result will be saved
780 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
782 struct inode_smack *isp = inode->i_security;
784 *secid = smack_to_secid(isp->smk_inode);
792 * smack_file_permission - Smack check on file operations
798 * Should access checks be done on each read or write?
799 * UNICOS and SELinux say yes.
800 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
802 * I'll say no for now. Smack does not do the frequent
803 * label changing that SELinux does.
805 static int smack_file_permission(struct file *file, int mask)
811 * smack_file_alloc_security - assign a file security blob
814 * The security blob for a file is a pointer to the master
815 * label list, so no allocation is done.
819 static int smack_file_alloc_security(struct file *file)
821 file->f_security = current->security;
826 * smack_file_free_security - clear a file security blob
829 * The security blob for a file is a pointer to the master
830 * label list, so no memory is freed.
832 static void smack_file_free_security(struct file *file)
834 file->f_security = NULL;
838 * smack_file_ioctl - Smack check on ioctls
843 * Relies heavily on the correct use of the ioctl command conventions.
845 * Returns 0 if allowed, error code otherwise
847 static int smack_file_ioctl(struct file *file, unsigned int cmd,
852 if (_IOC_DIR(cmd) & _IOC_WRITE)
853 rc = smk_curacc(file->f_security, MAY_WRITE);
855 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
856 rc = smk_curacc(file->f_security, MAY_READ);
862 * smack_file_lock - Smack check on file locking
866 * Returns 0 if current has write access, error code otherwise
868 static int smack_file_lock(struct file *file, unsigned int cmd)
870 return smk_curacc(file->f_security, MAY_WRITE);
874 * smack_file_fcntl - Smack check on fcntl
876 * @cmd: what action to check
879 * Returns 0 if current has access, error code otherwise
881 static int smack_file_fcntl(struct file *file, unsigned int cmd,
893 rc = smk_curacc(file->f_security, MAY_READ);
901 rc = smk_curacc(file->f_security, MAY_WRITE);
904 rc = smk_curacc(file->f_security, MAY_READWRITE);
911 * smack_file_set_fowner - set the file security blob value
912 * @file: object in question
915 * Further research may be required on this one.
917 static int smack_file_set_fowner(struct file *file)
919 file->f_security = current->security;
924 * smack_file_send_sigiotask - Smack on sigio
925 * @tsk: The target task
926 * @fown: the object the signal come from
929 * Allow a privileged task to get signals even if it shouldn't
931 * Returns 0 if a subject with the object's smack could
932 * write to the task, an error code otherwise.
934 static int smack_file_send_sigiotask(struct task_struct *tsk,
935 struct fown_struct *fown, int signum)
941 * struct fown_struct is never outside the context of a struct file
943 file = container_of(fown, struct file, f_owner);
944 rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
945 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
951 * smack_file_receive - Smack file receive check
954 * Returns 0 if current has access, error code otherwise
956 static int smack_file_receive(struct file *file)
961 * This code relies on bitmasks.
963 if (file->f_mode & FMODE_READ)
965 if (file->f_mode & FMODE_WRITE)
968 return smk_curacc(file->f_security, may);
976 * smack_task_alloc_security - "allocate" a task blob
977 * @tsk: the task in need of a blob
979 * Smack isn't using copies of blobs. Everyone
980 * points to an immutable list. No alloc required.
981 * No data copy required.
985 static int smack_task_alloc_security(struct task_struct *tsk)
987 tsk->security = current->security;
993 * smack_task_free_security - "free" a task blob
994 * @task: the task with the blob
996 * Smack isn't using copies of blobs. Everyone
997 * points to an immutable list. The blobs never go away.
998 * There is no leak here.
1000 static void smack_task_free_security(struct task_struct *task)
1002 task->security = NULL;
1006 * smack_task_setpgid - Smack check on setting pgid
1007 * @p: the task object
1010 * Return 0 if write access is permitted
1012 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1014 return smk_curacc(p->security, MAY_WRITE);
1018 * smack_task_getpgid - Smack access check for getpgid
1019 * @p: the object task
1021 * Returns 0 if current can read the object task, error code otherwise
1023 static int smack_task_getpgid(struct task_struct *p)
1025 return smk_curacc(p->security, MAY_READ);
1029 * smack_task_getsid - Smack access check for getsid
1030 * @p: the object task
1032 * Returns 0 if current can read the object task, error code otherwise
1034 static int smack_task_getsid(struct task_struct *p)
1036 return smk_curacc(p->security, MAY_READ);
1040 * smack_task_getsecid - get the secid of the task
1041 * @p: the object task
1042 * @secid: where to put the result
1044 * Sets the secid to contain a u32 version of the smack label.
1046 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1048 *secid = smack_to_secid(p->security);
1052 * smack_task_setnice - Smack check on setting nice
1053 * @p: the task object
1056 * Return 0 if write access is permitted
1058 static int smack_task_setnice(struct task_struct *p, int nice)
1062 rc = cap_task_setnice(p, nice);
1064 rc = smk_curacc(p->security, MAY_WRITE);
1069 * smack_task_setioprio - Smack check on setting ioprio
1070 * @p: the task object
1073 * Return 0 if write access is permitted
1075 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1079 rc = cap_task_setioprio(p, ioprio);
1081 rc = smk_curacc(p->security, MAY_WRITE);
1086 * smack_task_getioprio - Smack check on reading ioprio
1087 * @p: the task object
1089 * Return 0 if read access is permitted
1091 static int smack_task_getioprio(struct task_struct *p)
1093 return smk_curacc(p->security, MAY_READ);
1097 * smack_task_setscheduler - Smack check on setting scheduler
1098 * @p: the task object
1102 * Return 0 if read access is permitted
1104 static int smack_task_setscheduler(struct task_struct *p, int policy,
1105 struct sched_param *lp)
1109 rc = cap_task_setscheduler(p, policy, lp);
1111 rc = smk_curacc(p->security, MAY_WRITE);
1116 * smack_task_getscheduler - Smack check on reading scheduler
1117 * @p: the task object
1119 * Return 0 if read access is permitted
1121 static int smack_task_getscheduler(struct task_struct *p)
1123 return smk_curacc(p->security, MAY_READ);
1127 * smack_task_movememory - Smack check on moving memory
1128 * @p: the task object
1130 * Return 0 if write access is permitted
1132 static int smack_task_movememory(struct task_struct *p)
1134 return smk_curacc(p->security, MAY_WRITE);
1138 * smack_task_kill - Smack check on signal delivery
1139 * @p: the task object
1142 * @secid: identifies the smack to use in lieu of current's
1144 * Return 0 if write access is permitted
1146 * The secid behavior is an artifact of an SELinux hack
1147 * in the USB code. Someday it may go away.
1149 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1153 * Sending a signal requires that the sender
1154 * can write the receiver.
1157 return smk_curacc(p->security, MAY_WRITE);
1159 * If the secid isn't 0 we're dealing with some USB IO
1160 * specific behavior. This is not clean. For one thing
1161 * we can't take privilege into account.
1163 return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
1167 * smack_task_wait - Smack access check for waiting
1168 * @p: task to wait for
1170 * Returns 0 if current can wait for p, error code otherwise
1172 static int smack_task_wait(struct task_struct *p)
1176 rc = smk_access(current->security, p->security, MAY_WRITE);
1181 * Allow the operation to succeed if either task
1182 * has privilege to perform operations that might
1183 * account for the smack labels having gotten to
1184 * be different in the first place.
1186 * This breaks the strict subject/object access
1187 * control ideal, taking the object's privilege
1188 * state into account in the decision as well as
1191 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1198 * smack_task_to_inode - copy task smack into the inode blob
1199 * @p: task to copy from
1200 * inode: inode to copy to
1202 * Sets the smack pointer in the inode security blob
1204 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1206 struct inode_smack *isp = inode->i_security;
1207 isp->smk_inode = p->security;
1215 * smack_sk_alloc_security - Allocate a socket blob
1218 * @priority: memory allocation priority
1220 * Assign Smack pointers to current
1222 * Returns 0 on success, -ENOMEM is there's no memory
1224 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1226 char *csp = current->security;
1227 struct socket_smack *ssp;
1229 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1235 ssp->smk_packet[0] = '\0';
1237 sk->sk_security = ssp;
1243 * smack_sk_free_security - Free a socket blob
1246 * Clears the blob pointer
1248 static void smack_sk_free_security(struct sock *sk)
1250 kfree(sk->sk_security);
1254 * smack_set_catset - convert a capset to netlabel mls categories
1255 * @catset: the Smack categories
1256 * @sap: where to put the netlabel categories
1258 * Allocates and fills attr.mls.cat
1260 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1271 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1272 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1273 sap->attr.mls.cat->startbit = 0;
1275 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1276 for (m = 0x80; m != 0; m >>= 1, cat++) {
1279 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1285 * smack_to_secattr - fill a secattr from a smack value
1286 * @smack: the smack value
1287 * @nlsp: where the result goes
1289 * Casey says that CIPSO is good enough for now.
1290 * It can be used to effect.
1291 * It can also be abused to effect when necessary.
1292 * Appologies to the TSIG group in general and GW in particular.
1294 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1296 struct smack_cipso cipso;
1299 switch (smack_net_nltype) {
1300 case NETLBL_NLTYPE_CIPSOV4:
1301 nlsp->domain = smack;
1302 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
1304 rc = smack_to_cipso(smack, &cipso);
1306 nlsp->attr.mls.lvl = cipso.smk_level;
1307 smack_set_catset(cipso.smk_catset, nlsp);
1309 nlsp->attr.mls.lvl = smack_cipso_direct;
1310 smack_set_catset(smack, nlsp);
1319 * smack_netlabel - Set the secattr on a socket
1322 * Convert the outbound smack value (smk_out) to a
1323 * secattr and attach it to the socket.
1325 * Returns 0 on success or an error code
1327 static int smack_netlabel(struct sock *sk)
1329 struct socket_smack *ssp;
1330 struct netlbl_lsm_secattr secattr;
1333 ssp = sk->sk_security;
1334 netlbl_secattr_init(&secattr);
1335 smack_to_secattr(ssp->smk_out, &secattr);
1336 rc = netlbl_sock_setattr(sk, &secattr);
1337 netlbl_secattr_destroy(&secattr);
1343 * smack_inode_setsecurity - set smack xattrs
1344 * @inode: the object
1345 * @name: attribute name
1346 * @value: attribute value
1347 * @size: size of the attribute
1350 * Sets the named attribute in the appropriate blob
1352 * Returns 0 on success, or an error code
1354 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1355 const void *value, size_t size, int flags)
1358 struct inode_smack *nsp = inode->i_security;
1359 struct socket_smack *ssp;
1360 struct socket *sock;
1363 if (value == NULL || size > SMK_LABELLEN)
1366 sp = smk_import(value, size);
1370 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1371 nsp->smk_inode = sp;
1375 * The rest of the Smack xattrs are only on sockets.
1377 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1380 sock = SOCKET_I(inode);
1381 if (sock == NULL || sock->sk == NULL)
1384 ssp = sock->sk->sk_security;
1386 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1388 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1390 rc = smack_netlabel(sock->sk);
1392 printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
1401 * smack_socket_post_create - finish socket setup
1403 * @family: protocol family
1408 * Sets the netlabel information on the socket
1410 * Returns 0 on success, and error code otherwise
1412 static int smack_socket_post_create(struct socket *sock, int family,
1413 int type, int protocol, int kern)
1415 if (family != PF_INET || sock->sk == NULL)
1418 * Set the outbound netlbl.
1420 return smack_netlabel(sock->sk);
1424 * smack_flags_to_may - convert S_ to MAY_ values
1425 * @flags: the S_ value
1427 * Returns the equivalent MAY_ value
1429 static int smack_flags_to_may(int flags)
1433 if (flags & S_IRUGO)
1435 if (flags & S_IWUGO)
1437 if (flags & S_IXUGO)
1444 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1449 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
1451 msg->security = current->security;
1456 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1459 * Clears the blob pointer
1461 static void smack_msg_msg_free_security(struct msg_msg *msg)
1463 msg->security = NULL;
1467 * smack_of_shm - the smack pointer for the shm
1470 * Returns a pointer to the smack value
1472 static char *smack_of_shm(struct shmid_kernel *shp)
1474 return (char *)shp->shm_perm.security;
1478 * smack_shm_alloc_security - Set the security blob for shm
1483 static int smack_shm_alloc_security(struct shmid_kernel *shp)
1485 struct kern_ipc_perm *isp = &shp->shm_perm;
1487 isp->security = current->security;
1492 * smack_shm_free_security - Clear the security blob for shm
1495 * Clears the blob pointer
1497 static void smack_shm_free_security(struct shmid_kernel *shp)
1499 struct kern_ipc_perm *isp = &shp->shm_perm;
1501 isp->security = NULL;
1505 * smack_shm_associate - Smack access check for shm
1507 * @shmflg: access requested
1509 * Returns 0 if current has the requested access, error code otherwise
1511 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
1513 char *ssp = smack_of_shm(shp);
1516 may = smack_flags_to_may(shmflg);
1517 return smk_curacc(ssp, may);
1521 * smack_shm_shmctl - Smack access check for shm
1523 * @cmd: what it wants to do
1525 * Returns 0 if current has the requested access, error code otherwise
1527 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
1541 may = MAY_READWRITE;
1546 * System level information.
1553 ssp = smack_of_shm(shp);
1554 return smk_curacc(ssp, may);
1558 * smack_shm_shmat - Smack access for shmat
1561 * @shmflg: access requested
1563 * Returns 0 if current has the requested access, error code otherwise
1565 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
1568 char *ssp = smack_of_shm(shp);
1571 may = smack_flags_to_may(shmflg);
1572 return smk_curacc(ssp, may);
1576 * smack_of_sem - the smack pointer for the sem
1579 * Returns a pointer to the smack value
1581 static char *smack_of_sem(struct sem_array *sma)
1583 return (char *)sma->sem_perm.security;
1587 * smack_sem_alloc_security - Set the security blob for sem
1592 static int smack_sem_alloc_security(struct sem_array *sma)
1594 struct kern_ipc_perm *isp = &sma->sem_perm;
1596 isp->security = current->security;
1601 * smack_sem_free_security - Clear the security blob for sem
1604 * Clears the blob pointer
1606 static void smack_sem_free_security(struct sem_array *sma)
1608 struct kern_ipc_perm *isp = &sma->sem_perm;
1610 isp->security = NULL;
1614 * smack_sem_associate - Smack access check for sem
1616 * @semflg: access requested
1618 * Returns 0 if current has the requested access, error code otherwise
1620 static int smack_sem_associate(struct sem_array *sma, int semflg)
1622 char *ssp = smack_of_sem(sma);
1625 may = smack_flags_to_may(semflg);
1626 return smk_curacc(ssp, may);
1630 * smack_sem_shmctl - Smack access check for sem
1632 * @cmd: what it wants to do
1634 * Returns 0 if current has the requested access, error code otherwise
1636 static int smack_sem_semctl(struct sem_array *sma, int cmd)
1655 may = MAY_READWRITE;
1660 * System level information
1667 ssp = smack_of_sem(sma);
1668 return smk_curacc(ssp, may);
1672 * smack_sem_semop - Smack checks of semaphore operations
1678 * Treated as read and write in all cases.
1680 * Returns 0 if access is allowed, error code otherwise
1682 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
1683 unsigned nsops, int alter)
1685 char *ssp = smack_of_sem(sma);
1687 return smk_curacc(ssp, MAY_READWRITE);
1691 * smack_msg_alloc_security - Set the security blob for msg
1696 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
1698 struct kern_ipc_perm *kisp = &msq->q_perm;
1700 kisp->security = current->security;
1705 * smack_msg_free_security - Clear the security blob for msg
1708 * Clears the blob pointer
1710 static void smack_msg_queue_free_security(struct msg_queue *msq)
1712 struct kern_ipc_perm *kisp = &msq->q_perm;
1714 kisp->security = NULL;
1718 * smack_of_msq - the smack pointer for the msq
1721 * Returns a pointer to the smack value
1723 static char *smack_of_msq(struct msg_queue *msq)
1725 return (char *)msq->q_perm.security;
1729 * smack_msg_queue_associate - Smack access check for msg_queue
1731 * @msqflg: access requested
1733 * Returns 0 if current has the requested access, error code otherwise
1735 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
1737 char *msp = smack_of_msq(msq);
1740 may = smack_flags_to_may(msqflg);
1741 return smk_curacc(msp, may);
1745 * smack_msg_queue_msgctl - Smack access check for msg_queue
1747 * @cmd: what it wants to do
1749 * Returns 0 if current has the requested access, error code otherwise
1751 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
1763 may = MAY_READWRITE;
1768 * System level information
1775 msp = smack_of_msq(msq);
1776 return smk_curacc(msp, may);
1780 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1783 * @msqflg: access requested
1785 * Returns 0 if current has the requested access, error code otherwise
1787 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
1790 char *msp = smack_of_msq(msq);
1793 rc = smack_flags_to_may(msqflg);
1794 return smk_curacc(msp, rc);
1798 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1805 * Returns 0 if current has read and write access, error code otherwise
1807 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
1808 struct task_struct *target, long type, int mode)
1810 char *msp = smack_of_msq(msq);
1812 return smk_curacc(msp, MAY_READWRITE);
1816 * smack_ipc_permission - Smack access for ipc_permission()
1817 * @ipp: the object permissions
1818 * @flag: access requested
1820 * Returns 0 if current has read and write access, error code otherwise
1822 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
1824 char *isp = ipp->security;
1827 may = smack_flags_to_may(flag);
1828 return smk_curacc(isp, may);
1832 * smack_ipc_getsecid - Extract smack security id
1833 * @ipcp: the object permissions
1834 * @secid: where result will be saved
1836 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
1838 char *smack = ipp->security;
1840 *secid = smack_to_secid(smack);
1844 * smack_d_instantiate - Make sure the blob is correct on an inode
1845 * @opt_dentry: unused
1846 * @inode: the object
1848 * Set the inode's security blob if it hasn't been done already.
1850 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
1852 struct super_block *sbp;
1853 struct superblock_smack *sbsp;
1854 struct inode_smack *isp;
1855 char *csp = current->security;
1863 isp = inode->i_security;
1865 mutex_lock(&isp->smk_lock);
1867 * If the inode is already instantiated
1868 * take the quick way out
1870 if (isp->smk_flags & SMK_INODE_INSTANT)
1874 sbsp = sbp->s_security;
1876 * We're going to use the superblock default label
1877 * if there's no label on the file.
1879 final = sbsp->smk_default;
1882 * If this is the root inode the superblock
1883 * may be in the process of initialization.
1884 * If that is the case use the root value out
1885 * of the superblock.
1887 if (opt_dentry->d_parent == opt_dentry) {
1888 isp->smk_inode = sbsp->smk_root;
1889 isp->smk_flags |= SMK_INODE_INSTANT;
1894 * This is pretty hackish.
1895 * Casey says that we shouldn't have to do
1896 * file system specific code, but it does help
1897 * with keeping it simple.
1899 switch (sbp->s_magic) {
1902 * Casey says that it's a little embarassing
1903 * that the smack file system doesn't do
1904 * extended attributes.
1906 final = smack_known_star.smk_known;
1910 * Casey says pipes are easy (?)
1912 final = smack_known_star.smk_known;
1914 case DEVPTS_SUPER_MAGIC:
1916 * devpts seems content with the label of the task.
1917 * Programs that change smack have to treat the
1924 * Casey says sockets get the smack of the task.
1928 case PROC_SUPER_MAGIC:
1930 * Casey says procfs appears not to care.
1931 * The superblock default suffices.
1936 * Device labels should come from the filesystem,
1937 * but watch out, because they're volitile,
1938 * getting recreated on every reboot.
1940 final = smack_known_star.smk_known;
1944 * If a smack value has been set we want to use it,
1945 * but since tmpfs isn't giving us the opportunity
1946 * to set mount options simulate setting the
1947 * superblock default.
1951 * This isn't an understood special case.
1952 * Get the value from the xattr.
1954 * No xattr support means, alas, no SMACK label.
1955 * Use the aforeapplied default.
1956 * It would be curious if the label of the task
1957 * does not match that assigned.
1959 if (inode->i_op->getxattr == NULL)
1962 * Get the dentry for xattr.
1964 if (opt_dentry == NULL) {
1965 dp = d_find_alias(inode);
1969 dp = dget(opt_dentry);
1974 fetched = smk_fetch(inode, dp);
1975 if (fetched != NULL)
1983 isp->smk_inode = csp;
1985 isp->smk_inode = final;
1987 isp->smk_flags |= SMK_INODE_INSTANT;
1990 mutex_unlock(&isp->smk_lock);
1995 * smack_getprocattr - Smack process attribute access
1996 * @p: the object task
1997 * @name: the name of the attribute in /proc/.../attr
1998 * @value: where to put the result
2000 * Places a copy of the task Smack into value
2002 * Returns the length of the smack label or an error code
2004 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2009 if (strcmp(name, "current") != 0)
2012 cp = kstrdup(p->security, GFP_KERNEL);
2022 * smack_setprocattr - Smack process attribute setting
2023 * @p: the object task
2024 * @name: the name of the attribute in /proc/.../attr
2025 * @value: the value to set
2026 * @size: the size of the value
2028 * Sets the Smack value of the task. Only setting self
2029 * is permitted and only with privilege
2031 * Returns the length of the smack label or an error code
2033 static int smack_setprocattr(struct task_struct *p, char *name,
2034 void *value, size_t size)
2039 * Changing another process' Smack value is too dangerous
2040 * and supports no sane use case.
2045 if (!capable(CAP_MAC_ADMIN))
2048 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2051 if (strcmp(name, "current") != 0)
2054 newsmack = smk_import(value, size);
2055 if (newsmack == NULL)
2058 p->security = newsmack;
2063 * smack_unix_stream_connect - Smack access on UDS
2065 * @other: the other socket
2068 * Return 0 if a subject with the smack of sock could access
2069 * an object with the smack of other, otherwise an error code
2071 static int smack_unix_stream_connect(struct socket *sock,
2072 struct socket *other, struct sock *newsk)
2074 struct inode *sp = SOCK_INODE(sock);
2075 struct inode *op = SOCK_INODE(other);
2077 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE);
2081 * smack_unix_may_send - Smack access on UDS
2083 * @other: the other socket
2085 * Return 0 if a subject with the smack of sock could access
2086 * an object with the smack of other, otherwise an error code
2088 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2090 struct inode *sp = SOCK_INODE(sock);
2091 struct inode *op = SOCK_INODE(other);
2093 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE);
2097 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2099 * @sap: netlabel secattr
2100 * @sip: where to put the result
2102 * Copies a smack label into sip
2104 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2106 char smack[SMK_LABELLEN];
2109 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) {
2111 * If there are flags but no level netlabel isn't
2112 * behaving the way we expect it to.
2114 * Without guidance regarding the smack value
2115 * for the packet fall back on the network
2118 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2122 * Get the categories, if any
2124 memset(smack, '\0', SMK_LABELLEN);
2125 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2127 pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat,
2131 smack_catset_bit(pcat, smack);
2134 * If it is CIPSO using smack direct mapping
2135 * we are already done. WeeHee.
2137 if (sap->attr.mls.lvl == smack_cipso_direct) {
2138 memcpy(sip, smack, SMK_MAXLEN);
2142 * Look it up in the supplied table if it is not a direct mapping.
2144 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2149 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2153 * Returns 0 if the packet should be delivered, an error code otherwise
2155 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2157 struct netlbl_lsm_secattr secattr;
2158 struct socket_smack *ssp = sk->sk_security;
2159 char smack[SMK_LABELLEN];
2162 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2166 * Translate what netlabel gave us.
2168 memset(smack, '\0', SMK_LABELLEN);
2169 netlbl_secattr_init(&secattr);
2170 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2172 smack_from_secattr(&secattr, smack);
2174 strncpy(smack, smack_net_ambient, SMK_MAXLEN);
2175 netlbl_secattr_destroy(&secattr);
2177 * Receiving a packet requires that the other end
2178 * be able to write here. Read access is not required.
2179 * This is the simplist possible security model
2182 return smk_access(smack, ssp->smk_in, MAY_WRITE);
2186 * smack_socket_getpeersec_stream - pull in packet label
2188 * @optval: user's destination
2189 * @optlen: size thereof
2192 * returns zero on success, an error code otherwise
2194 static int smack_socket_getpeersec_stream(struct socket *sock,
2195 char __user *optval,
2196 int __user *optlen, unsigned len)
2198 struct socket_smack *ssp;
2202 ssp = sock->sk->sk_security;
2203 slen = strlen(ssp->smk_packet) + 1;
2207 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2210 if (put_user(slen, optlen) != 0)
2218 * smack_socket_getpeersec_dgram - pull in packet label
2221 * @secid: pointer to where to put the secid of the packet
2223 * Sets the netlabel socket state on sk from parent
2225 static int smack_socket_getpeersec_dgram(struct socket *sock,
2226 struct sk_buff *skb, u32 *secid)
2229 struct netlbl_lsm_secattr secattr;
2231 char smack[SMK_LABELLEN];
2232 int family = PF_INET;
2237 * Only works for families with packets.
2241 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2243 family = sk->sk_family;
2246 * Translate what netlabel gave us.
2248 memset(smack, '\0', SMK_LABELLEN);
2249 netlbl_secattr_init(&secattr);
2250 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2252 smack_from_secattr(&secattr, smack);
2253 netlbl_secattr_destroy(&secattr);
2256 * Give up if we couldn't get anything
2261 s = smack_to_secid(smack);
2270 * smack_sock_graft - graft access state between two sockets
2272 * @parent: donor socket
2274 * Sets the netlabel socket state on sk from parent
2276 static void smack_sock_graft(struct sock *sk, struct socket *parent)
2278 struct socket_smack *ssp;
2284 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2287 ssp = sk->sk_security;
2288 ssp->smk_in = current->security;
2289 ssp->smk_out = current->security;
2290 ssp->smk_packet[0] = '\0';
2292 rc = smack_netlabel(sk);
2294 printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
2299 * smack_inet_conn_request - Smack access check on connect
2300 * @sk: socket involved
2304 * Returns 0 if a task with the packet label could write to
2305 * the socket, otherwise an error code
2307 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
2308 struct request_sock *req)
2310 struct netlbl_lsm_secattr skb_secattr;
2311 struct socket_smack *ssp = sk->sk_security;
2312 char smack[SMK_LABELLEN];
2318 memset(smack, '\0', SMK_LABELLEN);
2319 netlbl_secattr_init(&skb_secattr);
2320 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
2322 smack_from_secattr(&skb_secattr, smack);
2324 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
2325 netlbl_secattr_destroy(&skb_secattr);
2327 * Receiving a packet requires that the other end
2328 * be able to write here. Read access is not required.
2330 * If the request is successful save the peer's label
2331 * so that SO_PEERCRED can report it.
2333 rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
2335 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
2341 * Key management security hooks
2343 * Casey has not tested key support very heavily.
2344 * The permission check is most likely too restrictive.
2345 * If you care about keys please have a look.
2350 * smack_key_alloc - Set the key security blob
2352 * @tsk: the task associated with the key
2355 * No allocation required
2359 static int smack_key_alloc(struct key *key, struct task_struct *tsk,
2360 unsigned long flags)
2362 key->security = tsk->security;
2367 * smack_key_free - Clear the key security blob
2370 * Clear the blob pointer
2372 static void smack_key_free(struct key *key)
2374 key->security = NULL;
2378 * smack_key_permission - Smack access on a key
2379 * @key_ref: gets to the object
2380 * @context: task involved
2383 * Return 0 if the task has read and write to the object,
2384 * an error code otherwise
2386 static int smack_key_permission(key_ref_t key_ref,
2387 struct task_struct *context, key_perm_t perm)
2391 keyp = key_ref_to_ptr(key_ref);
2395 * If the key hasn't been initialized give it access so that
2398 if (keyp->security == NULL)
2401 * This should not occur
2403 if (context->security == NULL)
2406 return smk_access(context->security, keyp->security, MAY_READWRITE);
2408 #endif /* CONFIG_KEYS */
2413 * Audit requires a unique representation of each Smack specific
2414 * rule. This unique representation is used to distinguish the
2415 * object to be audited from remaining kernel objects and also
2416 * works as a glue between the audit hooks.
2418 * Since repository entries are added but never deleted, we'll use
2419 * the smack_known label address related to the given audit rule as
2420 * the needed unique representation. This also better fits the smack
2421 * model where nearly everything is a label.
2426 * smack_audit_rule_init - Initialize a smack audit rule
2427 * @field: audit rule fields given from user-space (audit.h)
2428 * @op: required testing operator (=, !=, >, <, ...)
2429 * @rulestr: smack label to be audited
2430 * @vrule: pointer to save our own audit rule representation
2432 * Prepare to audit cases where (@field @op @rulestr) is true.
2433 * The label to be audited is created if necessay.
2435 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
2437 char **rule = (char **)vrule;
2440 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
2443 if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
2446 *rule = smk_import(rulestr, 0);
2452 * smack_audit_rule_known - Distinguish Smack audit rules
2453 * @krule: rule of interest, in Audit kernel representation format
2455 * This is used to filter Smack rules from remaining Audit ones.
2456 * If it's proved that this rule belongs to us, the
2457 * audit_rule_match hook will be called to do the final judgement.
2459 static int smack_audit_rule_known(struct audit_krule *krule)
2461 struct audit_field *f;
2464 for (i = 0; i < krule->field_count; i++) {
2465 f = &krule->fields[i];
2467 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
2475 * smack_audit_rule_match - Audit given object ?
2476 * @secid: security id for identifying the object to test
2477 * @field: audit rule flags given from user-space
2478 * @op: required testing operator
2479 * @vrule: smack internal rule presentation
2480 * @actx: audit context associated with the check
2482 * The core Audit hook. It's used to take the decision of
2483 * whether to audit or not to audit a given object.
2485 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
2486 struct audit_context *actx)
2492 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
2493 "Smack: missing rule\n");
2497 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
2500 smack = smack_from_secid(secid);
2503 * No need to do string comparisons. If a match occurs,
2504 * both pointers will point to the same smack_known
2507 if (op == AUDIT_EQUAL)
2508 return (rule == smack);
2509 if (op == AUDIT_NOT_EQUAL)
2510 return (rule != smack);
2516 * smack_audit_rule_free - free smack rule representation
2517 * @vrule: rule to be freed.
2519 * No memory was allocated.
2521 static void smack_audit_rule_free(void *vrule)
2526 #endif /* CONFIG_AUDIT */
2529 * smack_secid_to_secctx - return the smack label for a secid
2530 * @secid: incoming integer
2531 * @secdata: destination
2532 * @seclen: how long it is
2534 * Exists for networking code.
2536 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
2538 char *sp = smack_from_secid(secid);
2541 *seclen = strlen(sp);
2546 * smack_secctx_to_secid - return the secid for a smack label
2547 * @secdata: smack label
2548 * @seclen: how long result is
2549 * @secid: outgoing integer
2551 * Exists for audit and networking code.
2553 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
2555 *secid = smack_to_secid(secdata);
2560 * smack_release_secctx - don't do anything.
2565 * Exists to make sure nothing gets done, and properly
2567 static void smack_release_secctx(char *secdata, u32 seclen)
2571 struct security_operations smack_ops = {
2574 .ptrace_may_access = smack_ptrace_may_access,
2575 .ptrace_traceme = smack_ptrace_traceme,
2576 .capget = cap_capget,
2577 .capset_check = cap_capset_check,
2578 .capset_set = cap_capset_set,
2579 .capable = cap_capable,
2580 .syslog = smack_syslog,
2581 .settime = cap_settime,
2582 .vm_enough_memory = cap_vm_enough_memory,
2584 .bprm_apply_creds = cap_bprm_apply_creds,
2585 .bprm_set_security = cap_bprm_set_security,
2586 .bprm_secureexec = cap_bprm_secureexec,
2588 .sb_alloc_security = smack_sb_alloc_security,
2589 .sb_free_security = smack_sb_free_security,
2590 .sb_copy_data = smack_sb_copy_data,
2591 .sb_kern_mount = smack_sb_kern_mount,
2592 .sb_statfs = smack_sb_statfs,
2593 .sb_mount = smack_sb_mount,
2594 .sb_umount = smack_sb_umount,
2596 .inode_alloc_security = smack_inode_alloc_security,
2597 .inode_free_security = smack_inode_free_security,
2598 .inode_init_security = smack_inode_init_security,
2599 .inode_link = smack_inode_link,
2600 .inode_unlink = smack_inode_unlink,
2601 .inode_rmdir = smack_inode_rmdir,
2602 .inode_rename = smack_inode_rename,
2603 .inode_permission = smack_inode_permission,
2604 .inode_setattr = smack_inode_setattr,
2605 .inode_getattr = smack_inode_getattr,
2606 .inode_setxattr = smack_inode_setxattr,
2607 .inode_post_setxattr = smack_inode_post_setxattr,
2608 .inode_getxattr = smack_inode_getxattr,
2609 .inode_removexattr = smack_inode_removexattr,
2610 .inode_need_killpriv = cap_inode_need_killpriv,
2611 .inode_killpriv = cap_inode_killpriv,
2612 .inode_getsecurity = smack_inode_getsecurity,
2613 .inode_setsecurity = smack_inode_setsecurity,
2614 .inode_listsecurity = smack_inode_listsecurity,
2615 .inode_getsecid = smack_inode_getsecid,
2617 .file_permission = smack_file_permission,
2618 .file_alloc_security = smack_file_alloc_security,
2619 .file_free_security = smack_file_free_security,
2620 .file_ioctl = smack_file_ioctl,
2621 .file_lock = smack_file_lock,
2622 .file_fcntl = smack_file_fcntl,
2623 .file_set_fowner = smack_file_set_fowner,
2624 .file_send_sigiotask = smack_file_send_sigiotask,
2625 .file_receive = smack_file_receive,
2627 .task_alloc_security = smack_task_alloc_security,
2628 .task_free_security = smack_task_free_security,
2629 .task_post_setuid = cap_task_post_setuid,
2630 .task_setpgid = smack_task_setpgid,
2631 .task_getpgid = smack_task_getpgid,
2632 .task_getsid = smack_task_getsid,
2633 .task_getsecid = smack_task_getsecid,
2634 .task_setnice = smack_task_setnice,
2635 .task_setioprio = smack_task_setioprio,
2636 .task_getioprio = smack_task_getioprio,
2637 .task_setscheduler = smack_task_setscheduler,
2638 .task_getscheduler = smack_task_getscheduler,
2639 .task_movememory = smack_task_movememory,
2640 .task_kill = smack_task_kill,
2641 .task_wait = smack_task_wait,
2642 .task_reparent_to_init = cap_task_reparent_to_init,
2643 .task_to_inode = smack_task_to_inode,
2644 .task_prctl = cap_task_prctl,
2646 .ipc_permission = smack_ipc_permission,
2647 .ipc_getsecid = smack_ipc_getsecid,
2649 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
2650 .msg_msg_free_security = smack_msg_msg_free_security,
2652 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
2653 .msg_queue_free_security = smack_msg_queue_free_security,
2654 .msg_queue_associate = smack_msg_queue_associate,
2655 .msg_queue_msgctl = smack_msg_queue_msgctl,
2656 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
2657 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
2659 .shm_alloc_security = smack_shm_alloc_security,
2660 .shm_free_security = smack_shm_free_security,
2661 .shm_associate = smack_shm_associate,
2662 .shm_shmctl = smack_shm_shmctl,
2663 .shm_shmat = smack_shm_shmat,
2665 .sem_alloc_security = smack_sem_alloc_security,
2666 .sem_free_security = smack_sem_free_security,
2667 .sem_associate = smack_sem_associate,
2668 .sem_semctl = smack_sem_semctl,
2669 .sem_semop = smack_sem_semop,
2671 .netlink_send = cap_netlink_send,
2672 .netlink_recv = cap_netlink_recv,
2674 .d_instantiate = smack_d_instantiate,
2676 .getprocattr = smack_getprocattr,
2677 .setprocattr = smack_setprocattr,
2679 .unix_stream_connect = smack_unix_stream_connect,
2680 .unix_may_send = smack_unix_may_send,
2682 .socket_post_create = smack_socket_post_create,
2683 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
2684 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
2685 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
2686 .sk_alloc_security = smack_sk_alloc_security,
2687 .sk_free_security = smack_sk_free_security,
2688 .sock_graft = smack_sock_graft,
2689 .inet_conn_request = smack_inet_conn_request,
2691 /* key management security hooks */
2693 .key_alloc = smack_key_alloc,
2694 .key_free = smack_key_free,
2695 .key_permission = smack_key_permission,
2696 #endif /* CONFIG_KEYS */
2700 .audit_rule_init = smack_audit_rule_init,
2701 .audit_rule_known = smack_audit_rule_known,
2702 .audit_rule_match = smack_audit_rule_match,
2703 .audit_rule_free = smack_audit_rule_free,
2704 #endif /* CONFIG_AUDIT */
2706 .secid_to_secctx = smack_secid_to_secctx,
2707 .secctx_to_secid = smack_secctx_to_secid,
2708 .release_secctx = smack_release_secctx,
2712 * smack_init - initialize the smack system
2716 static __init int smack_init(void)
2718 if (!security_module_enable(&smack_ops))
2721 printk(KERN_INFO "Smack: Initializing.\n");
2724 * Set the security state for the initial task.
2726 current->security = &smack_known_floor.smk_known;
2731 spin_lock_init(&smack_known_unset.smk_cipsolock);
2732 spin_lock_init(&smack_known_huh.smk_cipsolock);
2733 spin_lock_init(&smack_known_hat.smk_cipsolock);
2734 spin_lock_init(&smack_known_star.smk_cipsolock);
2735 spin_lock_init(&smack_known_floor.smk_cipsolock);
2736 spin_lock_init(&smack_known_invalid.smk_cipsolock);
2741 if (register_security(&smack_ops))
2742 panic("smack: Unable to register with kernel.\n");
2748 * Smack requires early initialization in order to label
2749 * all processes and objects when they are created.
2751 security_initcall(smack_init);