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>
33 #define task_security(task) (task_cred_xxx((task), security))
36 * I hope these are the hokeyist lines of code in the module. Casey.
38 #define DEVPTS_SUPER_MAGIC 0x1cd1
39 #define SOCKFS_MAGIC 0x534F434B
40 #define TMPFS_MAGIC 0x01021994
43 * smk_fetch - Fetch the smack label from a file.
44 * @ip: a pointer to the inode
45 * @dp: a pointer to the dentry
47 * Returns a pointer to the master list entry for the Smack label
48 * or NULL if there was no label to fetch.
50 static char *smk_fetch(struct inode *ip, struct dentry *dp)
53 char in[SMK_LABELLEN];
55 if (ip->i_op->getxattr == NULL)
58 rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
62 return smk_import(in, rc);
66 * new_inode_smack - allocate an inode security blob
67 * @smack: a pointer to the Smack label to use in the blob
69 * Returns the new blob or NULL if there's no memory available
71 struct inode_smack *new_inode_smack(char *smack)
73 struct inode_smack *isp;
75 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
79 isp->smk_inode = smack;
81 mutex_init(&isp->smk_lock);
92 * smack_ptrace_may_access - Smack approval on PTRACE_ATTACH
93 * @ctp: child task pointer
95 * Returns 0 if access is OK, an error code otherwise
97 * Do the capability checks, and require read and write.
99 static int smack_ptrace_may_access(struct task_struct *ctp, unsigned int mode)
103 rc = cap_ptrace_may_access(ctp, mode);
107 rc = smk_access(current_security(), task_security(ctp), MAY_READWRITE);
108 if (rc != 0 && capable(CAP_MAC_OVERRIDE))
114 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME
115 * @ptp: parent task pointer
117 * Returns 0 if access is OK, an error code otherwise
119 * Do the capability checks, and require read and write.
121 static int smack_ptrace_traceme(struct task_struct *ptp)
125 rc = cap_ptrace_traceme(ptp);
129 rc = smk_access(task_security(ptp), current_security(), MAY_READWRITE);
130 if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
136 * smack_syslog - Smack approval on syslog
137 * @type: message type
139 * Require that the task has the floor label
141 * Returns 0 on success, error code otherwise.
143 static int smack_syslog(int type)
146 char *sp = current_security();
148 rc = cap_syslog(type);
152 if (capable(CAP_MAC_OVERRIDE))
155 if (sp != smack_known_floor.smk_known)
167 * smack_sb_alloc_security - allocate a superblock blob
168 * @sb: the superblock getting the blob
170 * Returns 0 on success or -ENOMEM on error.
172 static int smack_sb_alloc_security(struct super_block *sb)
174 struct superblock_smack *sbsp;
176 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
181 sbsp->smk_root = smack_known_floor.smk_known;
182 sbsp->smk_default = smack_known_floor.smk_known;
183 sbsp->smk_floor = smack_known_floor.smk_known;
184 sbsp->smk_hat = smack_known_hat.smk_known;
185 sbsp->smk_initialized = 0;
186 spin_lock_init(&sbsp->smk_sblock);
188 sb->s_security = sbsp;
194 * smack_sb_free_security - free a superblock blob
195 * @sb: the superblock getting the blob
198 static void smack_sb_free_security(struct super_block *sb)
200 kfree(sb->s_security);
201 sb->s_security = NULL;
205 * smack_sb_copy_data - copy mount options data for processing
206 * @type: file system type
207 * @orig: where to start
210 * Returns 0 on success or -ENOMEM on error.
212 * Copy the Smack specific mount options out of the mount
215 static int smack_sb_copy_data(char *orig, char *smackopts)
217 char *cp, *commap, *otheropts, *dp;
219 otheropts = (char *)get_zeroed_page(GFP_KERNEL);
220 if (otheropts == NULL)
223 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
224 if (strstr(cp, SMK_FSDEFAULT) == cp)
226 else if (strstr(cp, SMK_FSFLOOR) == cp)
228 else if (strstr(cp, SMK_FSHAT) == cp)
230 else if (strstr(cp, SMK_FSROOT) == cp)
235 commap = strchr(cp, ',');
244 strcpy(orig, otheropts);
245 free_page((unsigned long)otheropts);
251 * smack_sb_kern_mount - Smack specific mount processing
252 * @sb: the file system superblock
253 * @data: the smack mount options
255 * Returns 0 on success, an error code on failure
257 static int smack_sb_kern_mount(struct super_block *sb, void *data)
259 struct dentry *root = sb->s_root;
260 struct inode *inode = root->d_inode;
261 struct superblock_smack *sp = sb->s_security;
262 struct inode_smack *isp;
267 spin_lock(&sp->smk_sblock);
268 if (sp->smk_initialized != 0) {
269 spin_unlock(&sp->smk_sblock);
272 sp->smk_initialized = 1;
273 spin_unlock(&sp->smk_sblock);
275 for (op = data; op != NULL; op = commap) {
276 commap = strchr(op, ',');
280 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
281 op += strlen(SMK_FSHAT);
282 nsp = smk_import(op, 0);
285 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
286 op += strlen(SMK_FSFLOOR);
287 nsp = smk_import(op, 0);
290 } else if (strncmp(op, SMK_FSDEFAULT,
291 strlen(SMK_FSDEFAULT)) == 0) {
292 op += strlen(SMK_FSDEFAULT);
293 nsp = smk_import(op, 0);
295 sp->smk_default = nsp;
296 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
297 op += strlen(SMK_FSROOT);
298 nsp = smk_import(op, 0);
305 * Initialize the root inode.
307 isp = inode->i_security;
309 inode->i_security = new_inode_smack(sp->smk_root);
311 isp->smk_inode = sp->smk_root;
317 * smack_sb_statfs - Smack check on statfs
318 * @dentry: identifies the file system in question
320 * Returns 0 if current can read the floor of the filesystem,
321 * and error code otherwise
323 static int smack_sb_statfs(struct dentry *dentry)
325 struct superblock_smack *sbp = dentry->d_sb->s_security;
327 return smk_curacc(sbp->smk_floor, MAY_READ);
331 * smack_sb_mount - Smack check for mounting
338 * Returns 0 if current can write the floor of the filesystem
339 * being mounted on, an error code otherwise.
341 static int smack_sb_mount(char *dev_name, struct path *path,
342 char *type, unsigned long flags, void *data)
344 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security;
346 return smk_curacc(sbp->smk_floor, MAY_WRITE);
350 * smack_sb_umount - Smack check for unmounting
351 * @mnt: file system to unmount
354 * Returns 0 if current can write the floor of the filesystem
355 * being unmounted, an error code otherwise.
357 static int smack_sb_umount(struct vfsmount *mnt, int flags)
359 struct superblock_smack *sbp;
361 sbp = mnt->mnt_sb->s_security;
363 return smk_curacc(sbp->smk_floor, MAY_WRITE);
371 * smack_inode_alloc_security - allocate an inode blob
372 * @inode - the inode in need of a blob
374 * Returns 0 if it gets a blob, -ENOMEM otherwise
376 static int smack_inode_alloc_security(struct inode *inode)
378 inode->i_security = new_inode_smack(current_security());
379 if (inode->i_security == NULL)
385 * smack_inode_free_security - free an inode blob
386 * @inode - the inode with a blob
388 * Clears the blob pointer in inode
390 static void smack_inode_free_security(struct inode *inode)
392 kfree(inode->i_security);
393 inode->i_security = NULL;
397 * smack_inode_init_security - copy out the smack from an inode
400 * @name: where to put the attribute name
401 * @value: where to put the attribute value
402 * @len: where to put the length of the attribute
404 * Returns 0 if it all works out, -ENOMEM if there's no memory
406 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
407 char **name, void **value, size_t *len)
409 char *isp = smk_of_inode(inode);
412 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
418 *value = kstrdup(isp, GFP_KERNEL);
424 *len = strlen(isp) + 1;
430 * smack_inode_link - Smack check on link
431 * @old_dentry: the existing object
433 * @new_dentry: the new object
435 * Returns 0 if access is permitted, an error code otherwise
437 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
438 struct dentry *new_dentry)
443 isp = smk_of_inode(old_dentry->d_inode);
444 rc = smk_curacc(isp, MAY_WRITE);
446 if (rc == 0 && new_dentry->d_inode != NULL) {
447 isp = smk_of_inode(new_dentry->d_inode);
448 rc = smk_curacc(isp, MAY_WRITE);
455 * smack_inode_unlink - Smack check on inode deletion
456 * @dir: containing directory object
457 * @dentry: file to unlink
459 * Returns 0 if current can write the containing directory
460 * and the object, error code otherwise
462 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
464 struct inode *ip = dentry->d_inode;
468 * You need write access to the thing you're unlinking
470 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE);
473 * You also need write access to the containing directory
475 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
481 * smack_inode_rmdir - Smack check on directory deletion
482 * @dir: containing directory object
483 * @dentry: directory to unlink
485 * Returns 0 if current can write the containing directory
486 * and the directory, error code otherwise
488 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
493 * You need write access to the thing you're removing
495 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
498 * You also need write access to the containing directory
500 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
506 * smack_inode_rename - Smack check on rename
507 * @old_inode: the old directory
508 * @old_dentry: unused
509 * @new_inode: the new directory
510 * @new_dentry: unused
512 * Read and write access is required on both the old and
515 * Returns 0 if access is permitted, an error code otherwise
517 static int smack_inode_rename(struct inode *old_inode,
518 struct dentry *old_dentry,
519 struct inode *new_inode,
520 struct dentry *new_dentry)
525 isp = smk_of_inode(old_dentry->d_inode);
526 rc = smk_curacc(isp, MAY_READWRITE);
528 if (rc == 0 && new_dentry->d_inode != NULL) {
529 isp = smk_of_inode(new_dentry->d_inode);
530 rc = smk_curacc(isp, MAY_READWRITE);
537 * smack_inode_permission - Smack version of permission()
538 * @inode: the inode in question
539 * @mask: the access requested
542 * This is the important Smack hook.
544 * Returns 0 if access is permitted, -EACCES otherwise
546 static int smack_inode_permission(struct inode *inode, int mask)
549 * No permission to check. Existence test. Yup, it's there.
554 return smk_curacc(smk_of_inode(inode), mask);
558 * smack_inode_setattr - Smack check for setting attributes
559 * @dentry: the object
560 * @iattr: for the force flag
562 * Returns 0 if access is permitted, an error code otherwise
564 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
567 * Need to allow for clearing the setuid bit.
569 if (iattr->ia_valid & ATTR_FORCE)
572 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
576 * smack_inode_getattr - Smack check for getting attributes
578 * @dentry: the object
580 * Returns 0 if access is permitted, an error code otherwise
582 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
584 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
588 * smack_inode_setxattr - Smack check for setting xattrs
589 * @dentry: the object
590 * @name: name of the attribute
595 * This protects the Smack attribute explicitly.
597 * Returns 0 if access is permitted, an error code otherwise
599 static int smack_inode_setxattr(struct dentry *dentry, const char *name,
600 const void *value, size_t size, int flags)
604 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
605 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
606 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
607 if (!capable(CAP_MAC_ADMIN))
610 rc = cap_inode_setxattr(dentry, name, value, size, flags);
613 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
619 * smack_inode_post_setxattr - Apply the Smack update approved above
621 * @name: attribute name
622 * @value: attribute value
623 * @size: attribute size
626 * Set the pointer in the inode blob to the entry found
627 * in the master label list.
629 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
630 const void *value, size_t size, int flags)
632 struct inode_smack *isp;
638 if (strcmp(name, XATTR_NAME_SMACK))
641 if (size >= SMK_LABELLEN)
644 isp = dentry->d_inode->i_security;
647 * No locking is done here. This is a pointer
650 nsp = smk_import(value, size);
652 isp->smk_inode = nsp;
654 isp->smk_inode = smack_known_invalid.smk_known;
660 * smack_inode_getxattr - Smack check on getxattr
661 * @dentry: the object
664 * Returns 0 if access is permitted, an error code otherwise
666 static int smack_inode_getxattr(struct dentry *dentry, const char *name)
668 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
672 * smack_inode_removexattr - Smack check on removexattr
673 * @dentry: the object
674 * @name: name of the attribute
676 * Removing the Smack attribute requires CAP_MAC_ADMIN
678 * Returns 0 if access is permitted, an error code otherwise
680 static int smack_inode_removexattr(struct dentry *dentry, const char *name)
684 if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
685 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
686 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
687 if (!capable(CAP_MAC_ADMIN))
690 rc = cap_inode_removexattr(dentry, name);
693 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
699 * smack_inode_getsecurity - get smack xattrs
701 * @name: attribute name
702 * @buffer: where to put the result
703 * @size: size of the buffer
706 * Returns the size of the attribute or an error code
708 static int smack_inode_getsecurity(const struct inode *inode,
709 const char *name, void **buffer,
712 struct socket_smack *ssp;
714 struct super_block *sbp;
715 struct inode *ip = (struct inode *)inode;
720 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
721 isp = smk_of_inode(inode);
722 ilen = strlen(isp) + 1;
728 * The rest of the Smack xattrs are only on sockets.
731 if (sbp->s_magic != SOCKFS_MAGIC)
735 if (sock == NULL || sock->sk == NULL)
738 ssp = sock->sk->sk_security;
740 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
742 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
747 ilen = strlen(isp) + 1;
758 * smack_inode_listsecurity - list the Smack attributes
760 * @buffer: where they go
761 * @buffer_size: size of buffer
763 * Returns 0 on success, -EINVAL otherwise
765 static int smack_inode_listsecurity(struct inode *inode, char *buffer,
768 int len = strlen(XATTR_NAME_SMACK);
770 if (buffer != NULL && len <= buffer_size) {
771 memcpy(buffer, XATTR_NAME_SMACK, len);
778 * smack_inode_getsecid - Extract inode's security id
779 * @inode: inode to extract the info from
780 * @secid: where result will be saved
782 static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
784 struct inode_smack *isp = inode->i_security;
786 *secid = smack_to_secid(isp->smk_inode);
794 * smack_file_permission - Smack check on file operations
800 * Should access checks be done on each read or write?
801 * UNICOS and SELinux say yes.
802 * Trusted Solaris, Trusted Irix, and just about everyone else says no.
804 * I'll say no for now. Smack does not do the frequent
805 * label changing that SELinux does.
807 static int smack_file_permission(struct file *file, int mask)
813 * smack_file_alloc_security - assign a file security blob
816 * The security blob for a file is a pointer to the master
817 * label list, so no allocation is done.
821 static int smack_file_alloc_security(struct file *file)
823 file->f_security = current_security();
828 * smack_file_free_security - clear a file security blob
831 * The security blob for a file is a pointer to the master
832 * label list, so no memory is freed.
834 static void smack_file_free_security(struct file *file)
836 file->f_security = NULL;
840 * smack_file_ioctl - Smack check on ioctls
845 * Relies heavily on the correct use of the ioctl command conventions.
847 * Returns 0 if allowed, error code otherwise
849 static int smack_file_ioctl(struct file *file, unsigned int cmd,
854 if (_IOC_DIR(cmd) & _IOC_WRITE)
855 rc = smk_curacc(file->f_security, MAY_WRITE);
857 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
858 rc = smk_curacc(file->f_security, MAY_READ);
864 * smack_file_lock - Smack check on file locking
868 * Returns 0 if current has write access, error code otherwise
870 static int smack_file_lock(struct file *file, unsigned int cmd)
872 return smk_curacc(file->f_security, MAY_WRITE);
876 * smack_file_fcntl - Smack check on fcntl
878 * @cmd: what action to check
881 * Returns 0 if current has access, error code otherwise
883 static int smack_file_fcntl(struct file *file, unsigned int cmd,
895 rc = smk_curacc(file->f_security, MAY_READ);
903 rc = smk_curacc(file->f_security, MAY_WRITE);
906 rc = smk_curacc(file->f_security, MAY_READWRITE);
913 * smack_file_set_fowner - set the file security blob value
914 * @file: object in question
917 * Further research may be required on this one.
919 static int smack_file_set_fowner(struct file *file)
921 file->f_security = current_security();
926 * smack_file_send_sigiotask - Smack on sigio
927 * @tsk: The target task
928 * @fown: the object the signal come from
931 * Allow a privileged task to get signals even if it shouldn't
933 * Returns 0 if a subject with the object's smack could
934 * write to the task, an error code otherwise.
936 static int smack_file_send_sigiotask(struct task_struct *tsk,
937 struct fown_struct *fown, int signum)
943 * struct fown_struct is never outside the context of a struct file
945 file = container_of(fown, struct file, f_owner);
946 rc = smk_access(file->f_security, tsk->cred->security, MAY_WRITE);
947 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
953 * smack_file_receive - Smack file receive check
956 * Returns 0 if current has access, error code otherwise
958 static int smack_file_receive(struct file *file)
963 * This code relies on bitmasks.
965 if (file->f_mode & FMODE_READ)
967 if (file->f_mode & FMODE_WRITE)
970 return smk_curacc(file->f_security, may);
978 * smack_cred_free - "free" task-level security credentials
979 * @cred: the credentials in question
981 * Smack isn't using copies of blobs. Everyone
982 * points to an immutable list. The blobs never go away.
983 * There is no leak here.
985 static void smack_cred_free(struct cred *cred)
987 cred->security = NULL;
991 * smack_cred_prepare - prepare new set of credentials for modification
992 * @new: the new credentials
993 * @old: the original credentials
994 * @gfp: the atomicity of any memory allocations
996 * Prepare a new set of credentials for modification.
998 static int smack_cred_prepare(struct cred *new, const struct cred *old,
1001 new->security = old->security;
1006 * commit new credentials
1007 * @new: the new credentials
1008 * @old: the original credentials
1010 static void smack_cred_commit(struct cred *new, const struct cred *old)
1015 * smack_task_setpgid - Smack check on setting pgid
1016 * @p: the task object
1019 * Return 0 if write access is permitted
1021 static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
1023 return smk_curacc(task_security(p), MAY_WRITE);
1027 * smack_task_getpgid - Smack access check for getpgid
1028 * @p: the object task
1030 * Returns 0 if current can read the object task, error code otherwise
1032 static int smack_task_getpgid(struct task_struct *p)
1034 return smk_curacc(task_security(p), MAY_READ);
1038 * smack_task_getsid - Smack access check for getsid
1039 * @p: the object task
1041 * Returns 0 if current can read the object task, error code otherwise
1043 static int smack_task_getsid(struct task_struct *p)
1045 return smk_curacc(task_security(p), MAY_READ);
1049 * smack_task_getsecid - get the secid of the task
1050 * @p: the object task
1051 * @secid: where to put the result
1053 * Sets the secid to contain a u32 version of the smack label.
1055 static void smack_task_getsecid(struct task_struct *p, u32 *secid)
1057 *secid = smack_to_secid(task_security(p));
1061 * smack_task_setnice - Smack check on setting nice
1062 * @p: the task object
1065 * Return 0 if write access is permitted
1067 static int smack_task_setnice(struct task_struct *p, int nice)
1071 rc = cap_task_setnice(p, nice);
1073 rc = smk_curacc(task_security(p), MAY_WRITE);
1078 * smack_task_setioprio - Smack check on setting ioprio
1079 * @p: the task object
1082 * Return 0 if write access is permitted
1084 static int smack_task_setioprio(struct task_struct *p, int ioprio)
1088 rc = cap_task_setioprio(p, ioprio);
1090 rc = smk_curacc(task_security(p), MAY_WRITE);
1095 * smack_task_getioprio - Smack check on reading ioprio
1096 * @p: the task object
1098 * Return 0 if read access is permitted
1100 static int smack_task_getioprio(struct task_struct *p)
1102 return smk_curacc(task_security(p), MAY_READ);
1106 * smack_task_setscheduler - Smack check on setting scheduler
1107 * @p: the task object
1111 * Return 0 if read access is permitted
1113 static int smack_task_setscheduler(struct task_struct *p, int policy,
1114 struct sched_param *lp)
1118 rc = cap_task_setscheduler(p, policy, lp);
1120 rc = smk_curacc(task_security(p), MAY_WRITE);
1125 * smack_task_getscheduler - Smack check on reading scheduler
1126 * @p: the task object
1128 * Return 0 if read access is permitted
1130 static int smack_task_getscheduler(struct task_struct *p)
1132 return smk_curacc(task_security(p), MAY_READ);
1136 * smack_task_movememory - Smack check on moving memory
1137 * @p: the task object
1139 * Return 0 if write access is permitted
1141 static int smack_task_movememory(struct task_struct *p)
1143 return smk_curacc(task_security(p), MAY_WRITE);
1147 * smack_task_kill - Smack check on signal delivery
1148 * @p: the task object
1151 * @secid: identifies the smack to use in lieu of current's
1153 * Return 0 if write access is permitted
1155 * The secid behavior is an artifact of an SELinux hack
1156 * in the USB code. Someday it may go away.
1158 static int smack_task_kill(struct task_struct *p, struct siginfo *info,
1162 * Sending a signal requires that the sender
1163 * can write the receiver.
1166 return smk_curacc(task_security(p), MAY_WRITE);
1168 * If the secid isn't 0 we're dealing with some USB IO
1169 * specific behavior. This is not clean. For one thing
1170 * we can't take privilege into account.
1172 return smk_access(smack_from_secid(secid), task_security(p), MAY_WRITE);
1176 * smack_task_wait - Smack access check for waiting
1177 * @p: task to wait for
1179 * Returns 0 if current can wait for p, error code otherwise
1181 static int smack_task_wait(struct task_struct *p)
1185 rc = smk_access(current_security(), task_security(p), MAY_WRITE);
1190 * Allow the operation to succeed if either task
1191 * has privilege to perform operations that might
1192 * account for the smack labels having gotten to
1193 * be different in the first place.
1195 * This breaks the strict subject/object access
1196 * control ideal, taking the object's privilege
1197 * state into account in the decision as well as
1200 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE))
1207 * smack_task_to_inode - copy task smack into the inode blob
1208 * @p: task to copy from
1209 * inode: inode to copy to
1211 * Sets the smack pointer in the inode security blob
1213 static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
1215 struct inode_smack *isp = inode->i_security;
1216 isp->smk_inode = task_security(p);
1224 * smack_sk_alloc_security - Allocate a socket blob
1227 * @priority: memory allocation priority
1229 * Assign Smack pointers to current
1231 * Returns 0 on success, -ENOMEM is there's no memory
1233 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
1235 char *csp = current_security();
1236 struct socket_smack *ssp;
1238 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
1244 ssp->smk_packet[0] = '\0';
1246 sk->sk_security = ssp;
1252 * smack_sk_free_security - Free a socket blob
1255 * Clears the blob pointer
1257 static void smack_sk_free_security(struct sock *sk)
1259 kfree(sk->sk_security);
1263 * smack_set_catset - convert a capset to netlabel mls categories
1264 * @catset: the Smack categories
1265 * @sap: where to put the netlabel categories
1267 * Allocates and fills attr.mls.cat
1269 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
1280 sap->flags |= NETLBL_SECATTR_MLS_CAT;
1281 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
1282 sap->attr.mls.cat->startbit = 0;
1284 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
1285 for (m = 0x80; m != 0; m >>= 1, cat++) {
1288 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
1294 * smack_to_secattr - fill a secattr from a smack value
1295 * @smack: the smack value
1296 * @nlsp: where the result goes
1298 * Casey says that CIPSO is good enough for now.
1299 * It can be used to effect.
1300 * It can also be abused to effect when necessary.
1301 * Appologies to the TSIG group in general and GW in particular.
1303 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
1305 struct smack_cipso cipso;
1308 switch (smack_net_nltype) {
1309 case NETLBL_NLTYPE_CIPSOV4:
1310 nlsp->domain = smack;
1311 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
1313 rc = smack_to_cipso(smack, &cipso);
1315 nlsp->attr.mls.lvl = cipso.smk_level;
1316 smack_set_catset(cipso.smk_catset, nlsp);
1318 nlsp->attr.mls.lvl = smack_cipso_direct;
1319 smack_set_catset(smack, nlsp);
1328 * smack_netlabel - Set the secattr on a socket
1331 * Convert the outbound smack value (smk_out) to a
1332 * secattr and attach it to the socket.
1334 * Returns 0 on success or an error code
1336 static int smack_netlabel(struct sock *sk)
1338 struct socket_smack *ssp;
1339 struct netlbl_lsm_secattr secattr;
1342 ssp = sk->sk_security;
1343 netlbl_secattr_init(&secattr);
1344 smack_to_secattr(ssp->smk_out, &secattr);
1345 rc = netlbl_sock_setattr(sk, &secattr);
1346 netlbl_secattr_destroy(&secattr);
1352 * smack_inode_setsecurity - set smack xattrs
1353 * @inode: the object
1354 * @name: attribute name
1355 * @value: attribute value
1356 * @size: size of the attribute
1359 * Sets the named attribute in the appropriate blob
1361 * Returns 0 on success, or an error code
1363 static int smack_inode_setsecurity(struct inode *inode, const char *name,
1364 const void *value, size_t size, int flags)
1367 struct inode_smack *nsp = inode->i_security;
1368 struct socket_smack *ssp;
1369 struct socket *sock;
1372 if (value == NULL || size > SMK_LABELLEN)
1375 sp = smk_import(value, size);
1379 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
1380 nsp->smk_inode = sp;
1384 * The rest of the Smack xattrs are only on sockets.
1386 if (inode->i_sb->s_magic != SOCKFS_MAGIC)
1389 sock = SOCKET_I(inode);
1390 if (sock == NULL || sock->sk == NULL)
1393 ssp = sock->sk->sk_security;
1395 if (strcmp(name, XATTR_SMACK_IPIN) == 0)
1397 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
1399 rc = smack_netlabel(sock->sk);
1401 printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
1410 * smack_socket_post_create - finish socket setup
1412 * @family: protocol family
1417 * Sets the netlabel information on the socket
1419 * Returns 0 on success, and error code otherwise
1421 static int smack_socket_post_create(struct socket *sock, int family,
1422 int type, int protocol, int kern)
1424 if (family != PF_INET || sock->sk == NULL)
1427 * Set the outbound netlbl.
1429 return smack_netlabel(sock->sk);
1433 * smack_flags_to_may - convert S_ to MAY_ values
1434 * @flags: the S_ value
1436 * Returns the equivalent MAY_ value
1438 static int smack_flags_to_may(int flags)
1442 if (flags & S_IRUGO)
1444 if (flags & S_IWUGO)
1446 if (flags & S_IXUGO)
1453 * smack_msg_msg_alloc_security - Set the security blob for msg_msg
1458 static int smack_msg_msg_alloc_security(struct msg_msg *msg)
1460 msg->security = current_security();
1465 * smack_msg_msg_free_security - Clear the security blob for msg_msg
1468 * Clears the blob pointer
1470 static void smack_msg_msg_free_security(struct msg_msg *msg)
1472 msg->security = NULL;
1476 * smack_of_shm - the smack pointer for the shm
1479 * Returns a pointer to the smack value
1481 static char *smack_of_shm(struct shmid_kernel *shp)
1483 return (char *)shp->shm_perm.security;
1487 * smack_shm_alloc_security - Set the security blob for shm
1492 static int smack_shm_alloc_security(struct shmid_kernel *shp)
1494 struct kern_ipc_perm *isp = &shp->shm_perm;
1496 isp->security = current_security();
1501 * smack_shm_free_security - Clear the security blob for shm
1504 * Clears the blob pointer
1506 static void smack_shm_free_security(struct shmid_kernel *shp)
1508 struct kern_ipc_perm *isp = &shp->shm_perm;
1510 isp->security = NULL;
1514 * smack_shm_associate - Smack access check for shm
1516 * @shmflg: access requested
1518 * Returns 0 if current has the requested access, error code otherwise
1520 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
1522 char *ssp = smack_of_shm(shp);
1525 may = smack_flags_to_may(shmflg);
1526 return smk_curacc(ssp, may);
1530 * smack_shm_shmctl - Smack access check for shm
1532 * @cmd: what it wants to do
1534 * Returns 0 if current has the requested access, error code otherwise
1536 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
1550 may = MAY_READWRITE;
1555 * System level information.
1562 ssp = smack_of_shm(shp);
1563 return smk_curacc(ssp, may);
1567 * smack_shm_shmat - Smack access for shmat
1570 * @shmflg: access requested
1572 * Returns 0 if current has the requested access, error code otherwise
1574 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
1577 char *ssp = smack_of_shm(shp);
1580 may = smack_flags_to_may(shmflg);
1581 return smk_curacc(ssp, may);
1585 * smack_of_sem - the smack pointer for the sem
1588 * Returns a pointer to the smack value
1590 static char *smack_of_sem(struct sem_array *sma)
1592 return (char *)sma->sem_perm.security;
1596 * smack_sem_alloc_security - Set the security blob for sem
1601 static int smack_sem_alloc_security(struct sem_array *sma)
1603 struct kern_ipc_perm *isp = &sma->sem_perm;
1605 isp->security = current_security();
1610 * smack_sem_free_security - Clear the security blob for sem
1613 * Clears the blob pointer
1615 static void smack_sem_free_security(struct sem_array *sma)
1617 struct kern_ipc_perm *isp = &sma->sem_perm;
1619 isp->security = NULL;
1623 * smack_sem_associate - Smack access check for sem
1625 * @semflg: access requested
1627 * Returns 0 if current has the requested access, error code otherwise
1629 static int smack_sem_associate(struct sem_array *sma, int semflg)
1631 char *ssp = smack_of_sem(sma);
1634 may = smack_flags_to_may(semflg);
1635 return smk_curacc(ssp, may);
1639 * smack_sem_shmctl - Smack access check for sem
1641 * @cmd: what it wants to do
1643 * Returns 0 if current has the requested access, error code otherwise
1645 static int smack_sem_semctl(struct sem_array *sma, int cmd)
1664 may = MAY_READWRITE;
1669 * System level information
1676 ssp = smack_of_sem(sma);
1677 return smk_curacc(ssp, may);
1681 * smack_sem_semop - Smack checks of semaphore operations
1687 * Treated as read and write in all cases.
1689 * Returns 0 if access is allowed, error code otherwise
1691 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
1692 unsigned nsops, int alter)
1694 char *ssp = smack_of_sem(sma);
1696 return smk_curacc(ssp, MAY_READWRITE);
1700 * smack_msg_alloc_security - Set the security blob for msg
1705 static int smack_msg_queue_alloc_security(struct msg_queue *msq)
1707 struct kern_ipc_perm *kisp = &msq->q_perm;
1709 kisp->security = current_security();
1714 * smack_msg_free_security - Clear the security blob for msg
1717 * Clears the blob pointer
1719 static void smack_msg_queue_free_security(struct msg_queue *msq)
1721 struct kern_ipc_perm *kisp = &msq->q_perm;
1723 kisp->security = NULL;
1727 * smack_of_msq - the smack pointer for the msq
1730 * Returns a pointer to the smack value
1732 static char *smack_of_msq(struct msg_queue *msq)
1734 return (char *)msq->q_perm.security;
1738 * smack_msg_queue_associate - Smack access check for msg_queue
1740 * @msqflg: access requested
1742 * Returns 0 if current has the requested access, error code otherwise
1744 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
1746 char *msp = smack_of_msq(msq);
1749 may = smack_flags_to_may(msqflg);
1750 return smk_curacc(msp, may);
1754 * smack_msg_queue_msgctl - Smack access check for msg_queue
1756 * @cmd: what it wants to do
1758 * Returns 0 if current has the requested access, error code otherwise
1760 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
1772 may = MAY_READWRITE;
1777 * System level information
1784 msp = smack_of_msq(msq);
1785 return smk_curacc(msp, may);
1789 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1792 * @msqflg: access requested
1794 * Returns 0 if current has the requested access, error code otherwise
1796 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
1799 char *msp = smack_of_msq(msq);
1802 rc = smack_flags_to_may(msqflg);
1803 return smk_curacc(msp, rc);
1807 * smack_msg_queue_msgsnd - Smack access check for msg_queue
1814 * Returns 0 if current has read and write access, error code otherwise
1816 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
1817 struct task_struct *target, long type, int mode)
1819 char *msp = smack_of_msq(msq);
1821 return smk_curacc(msp, MAY_READWRITE);
1825 * smack_ipc_permission - Smack access for ipc_permission()
1826 * @ipp: the object permissions
1827 * @flag: access requested
1829 * Returns 0 if current has read and write access, error code otherwise
1831 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
1833 char *isp = ipp->security;
1836 may = smack_flags_to_may(flag);
1837 return smk_curacc(isp, may);
1841 * smack_ipc_getsecid - Extract smack security id
1842 * @ipcp: the object permissions
1843 * @secid: where result will be saved
1845 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
1847 char *smack = ipp->security;
1849 *secid = smack_to_secid(smack);
1853 * smack_d_instantiate - Make sure the blob is correct on an inode
1854 * @opt_dentry: unused
1855 * @inode: the object
1857 * Set the inode's security blob if it hasn't been done already.
1859 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
1861 struct super_block *sbp;
1862 struct superblock_smack *sbsp;
1863 struct inode_smack *isp;
1864 char *csp = current_security();
1872 isp = inode->i_security;
1874 mutex_lock(&isp->smk_lock);
1876 * If the inode is already instantiated
1877 * take the quick way out
1879 if (isp->smk_flags & SMK_INODE_INSTANT)
1883 sbsp = sbp->s_security;
1885 * We're going to use the superblock default label
1886 * if there's no label on the file.
1888 final = sbsp->smk_default;
1891 * If this is the root inode the superblock
1892 * may be in the process of initialization.
1893 * If that is the case use the root value out
1894 * of the superblock.
1896 if (opt_dentry->d_parent == opt_dentry) {
1897 isp->smk_inode = sbsp->smk_root;
1898 isp->smk_flags |= SMK_INODE_INSTANT;
1903 * This is pretty hackish.
1904 * Casey says that we shouldn't have to do
1905 * file system specific code, but it does help
1906 * with keeping it simple.
1908 switch (sbp->s_magic) {
1911 * Casey says that it's a little embarassing
1912 * that the smack file system doesn't do
1913 * extended attributes.
1915 final = smack_known_star.smk_known;
1919 * Casey says pipes are easy (?)
1921 final = smack_known_star.smk_known;
1923 case DEVPTS_SUPER_MAGIC:
1925 * devpts seems content with the label of the task.
1926 * Programs that change smack have to treat the
1933 * Casey says sockets get the smack of the task.
1937 case PROC_SUPER_MAGIC:
1939 * Casey says procfs appears not to care.
1940 * The superblock default suffices.
1945 * Device labels should come from the filesystem,
1946 * but watch out, because they're volitile,
1947 * getting recreated on every reboot.
1949 final = smack_known_star.smk_known;
1953 * If a smack value has been set we want to use it,
1954 * but since tmpfs isn't giving us the opportunity
1955 * to set mount options simulate setting the
1956 * superblock default.
1960 * This isn't an understood special case.
1961 * Get the value from the xattr.
1963 * No xattr support means, alas, no SMACK label.
1964 * Use the aforeapplied default.
1965 * It would be curious if the label of the task
1966 * does not match that assigned.
1968 if (inode->i_op->getxattr == NULL)
1971 * Get the dentry for xattr.
1973 if (opt_dentry == NULL) {
1974 dp = d_find_alias(inode);
1978 dp = dget(opt_dentry);
1983 fetched = smk_fetch(inode, dp);
1984 if (fetched != NULL)
1992 isp->smk_inode = csp;
1994 isp->smk_inode = final;
1996 isp->smk_flags |= SMK_INODE_INSTANT;
1999 mutex_unlock(&isp->smk_lock);
2004 * smack_getprocattr - Smack process attribute access
2005 * @p: the object task
2006 * @name: the name of the attribute in /proc/.../attr
2007 * @value: where to put the result
2009 * Places a copy of the task Smack into value
2011 * Returns the length of the smack label or an error code
2013 static int smack_getprocattr(struct task_struct *p, char *name, char **value)
2018 if (strcmp(name, "current") != 0)
2021 cp = kstrdup(task_security(p), GFP_KERNEL);
2031 * smack_setprocattr - Smack process attribute setting
2032 * @p: the object task
2033 * @name: the name of the attribute in /proc/.../attr
2034 * @value: the value to set
2035 * @size: the size of the value
2037 * Sets the Smack value of the task. Only setting self
2038 * is permitted and only with privilege
2040 * Returns the length of the smack label or an error code
2042 static int smack_setprocattr(struct task_struct *p, char *name,
2043 void *value, size_t size)
2049 * Changing another process' Smack value is too dangerous
2050 * and supports no sane use case.
2055 if (!capable(CAP_MAC_ADMIN))
2058 if (value == NULL || size == 0 || size >= SMK_LABELLEN)
2061 if (strcmp(name, "current") != 0)
2064 newsmack = smk_import(value, size);
2065 if (newsmack == NULL)
2068 new = prepare_creds();
2071 new->security = newsmack;
2077 * smack_unix_stream_connect - Smack access on UDS
2079 * @other: the other socket
2082 * Return 0 if a subject with the smack of sock could access
2083 * an object with the smack of other, otherwise an error code
2085 static int smack_unix_stream_connect(struct socket *sock,
2086 struct socket *other, struct sock *newsk)
2088 struct inode *sp = SOCK_INODE(sock);
2089 struct inode *op = SOCK_INODE(other);
2091 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE);
2095 * smack_unix_may_send - Smack access on UDS
2097 * @other: the other socket
2099 * Return 0 if a subject with the smack of sock could access
2100 * an object with the smack of other, otherwise an error code
2102 static int smack_unix_may_send(struct socket *sock, struct socket *other)
2104 struct inode *sp = SOCK_INODE(sock);
2105 struct inode *op = SOCK_INODE(other);
2107 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE);
2111 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
2113 * @sap: netlabel secattr
2114 * @sip: where to put the result
2116 * Copies a smack label into sip
2118 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
2120 char smack[SMK_LABELLEN];
2123 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) {
2125 * If there are flags but no level netlabel isn't
2126 * behaving the way we expect it to.
2128 * Without guidance regarding the smack value
2129 * for the packet fall back on the network
2132 strncpy(sip, smack_net_ambient, SMK_MAXLEN);
2136 * Get the categories, if any
2138 memset(smack, '\0', SMK_LABELLEN);
2139 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
2141 pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat,
2145 smack_catset_bit(pcat, smack);
2148 * If it is CIPSO using smack direct mapping
2149 * we are already done. WeeHee.
2151 if (sap->attr.mls.lvl == smack_cipso_direct) {
2152 memcpy(sip, smack, SMK_MAXLEN);
2156 * Look it up in the supplied table if it is not a direct mapping.
2158 smack_from_cipso(sap->attr.mls.lvl, smack, sip);
2163 * smack_socket_sock_rcv_skb - Smack packet delivery access check
2167 * Returns 0 if the packet should be delivered, an error code otherwise
2169 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
2171 struct netlbl_lsm_secattr secattr;
2172 struct socket_smack *ssp = sk->sk_security;
2173 char smack[SMK_LABELLEN];
2176 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2180 * Translate what netlabel gave us.
2182 memset(smack, '\0', SMK_LABELLEN);
2183 netlbl_secattr_init(&secattr);
2184 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
2186 smack_from_secattr(&secattr, smack);
2188 strncpy(smack, smack_net_ambient, SMK_MAXLEN);
2189 netlbl_secattr_destroy(&secattr);
2191 * Receiving a packet requires that the other end
2192 * be able to write here. Read access is not required.
2193 * This is the simplist possible security model
2196 rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
2198 netlbl_skbuff_err(skb, rc, 0);
2203 * smack_socket_getpeersec_stream - pull in packet label
2205 * @optval: user's destination
2206 * @optlen: size thereof
2209 * returns zero on success, an error code otherwise
2211 static int smack_socket_getpeersec_stream(struct socket *sock,
2212 char __user *optval,
2213 int __user *optlen, unsigned len)
2215 struct socket_smack *ssp;
2219 ssp = sock->sk->sk_security;
2220 slen = strlen(ssp->smk_packet) + 1;
2224 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
2227 if (put_user(slen, optlen) != 0)
2235 * smack_socket_getpeersec_dgram - pull in packet label
2238 * @secid: pointer to where to put the secid of the packet
2240 * Sets the netlabel socket state on sk from parent
2242 static int smack_socket_getpeersec_dgram(struct socket *sock,
2243 struct sk_buff *skb, u32 *secid)
2246 struct netlbl_lsm_secattr secattr;
2248 char smack[SMK_LABELLEN];
2249 int family = PF_INET;
2254 * Only works for families with packets.
2258 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2260 family = sk->sk_family;
2263 * Translate what netlabel gave us.
2265 memset(smack, '\0', SMK_LABELLEN);
2266 netlbl_secattr_init(&secattr);
2267 rc = netlbl_skbuff_getattr(skb, family, &secattr);
2269 smack_from_secattr(&secattr, smack);
2270 netlbl_secattr_destroy(&secattr);
2273 * Give up if we couldn't get anything
2278 s = smack_to_secid(smack);
2287 * smack_sock_graft - graft access state between two sockets
2289 * @parent: donor socket
2291 * Sets the netlabel socket state on sk from parent
2293 static void smack_sock_graft(struct sock *sk, struct socket *parent)
2295 struct socket_smack *ssp;
2301 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
2304 ssp = sk->sk_security;
2305 ssp->smk_in = ssp->smk_out = current_security();
2306 ssp->smk_packet[0] = '\0';
2308 rc = smack_netlabel(sk);
2310 printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
2315 * smack_inet_conn_request - Smack access check on connect
2316 * @sk: socket involved
2320 * Returns 0 if a task with the packet label could write to
2321 * the socket, otherwise an error code
2323 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
2324 struct request_sock *req)
2326 struct netlbl_lsm_secattr skb_secattr;
2327 struct socket_smack *ssp = sk->sk_security;
2328 char smack[SMK_LABELLEN];
2334 memset(smack, '\0', SMK_LABELLEN);
2335 netlbl_secattr_init(&skb_secattr);
2336 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
2338 smack_from_secattr(&skb_secattr, smack);
2340 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
2341 netlbl_secattr_destroy(&skb_secattr);
2343 * Receiving a packet requires that the other end
2344 * be able to write here. Read access is not required.
2346 * If the request is successful save the peer's label
2347 * so that SO_PEERCRED can report it.
2349 rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
2351 strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
2357 * Key management security hooks
2359 * Casey has not tested key support very heavily.
2360 * The permission check is most likely too restrictive.
2361 * If you care about keys please have a look.
2366 * smack_key_alloc - Set the key security blob
2368 * @cred: the credentials to use
2371 * No allocation required
2375 static int smack_key_alloc(struct key *key, const struct cred *cred,
2376 unsigned long flags)
2378 key->security = cred->security;
2383 * smack_key_free - Clear the key security blob
2386 * Clear the blob pointer
2388 static void smack_key_free(struct key *key)
2390 key->security = NULL;
2394 * smack_key_permission - Smack access on a key
2395 * @key_ref: gets to the object
2396 * @cred: the credentials to use
2399 * Return 0 if the task has read and write to the object,
2400 * an error code otherwise
2402 static int smack_key_permission(key_ref_t key_ref,
2403 const struct cred *cred, key_perm_t perm)
2407 keyp = key_ref_to_ptr(key_ref);
2411 * If the key hasn't been initialized give it access so that
2414 if (keyp->security == NULL)
2417 * This should not occur
2419 if (cred->security == NULL)
2422 return smk_access(cred->security, keyp->security, MAY_READWRITE);
2424 #endif /* CONFIG_KEYS */
2429 * Audit requires a unique representation of each Smack specific
2430 * rule. This unique representation is used to distinguish the
2431 * object to be audited from remaining kernel objects and also
2432 * works as a glue between the audit hooks.
2434 * Since repository entries are added but never deleted, we'll use
2435 * the smack_known label address related to the given audit rule as
2436 * the needed unique representation. This also better fits the smack
2437 * model where nearly everything is a label.
2442 * smack_audit_rule_init - Initialize a smack audit rule
2443 * @field: audit rule fields given from user-space (audit.h)
2444 * @op: required testing operator (=, !=, >, <, ...)
2445 * @rulestr: smack label to be audited
2446 * @vrule: pointer to save our own audit rule representation
2448 * Prepare to audit cases where (@field @op @rulestr) is true.
2449 * The label to be audited is created if necessay.
2451 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
2453 char **rule = (char **)vrule;
2456 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
2459 if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
2462 *rule = smk_import(rulestr, 0);
2468 * smack_audit_rule_known - Distinguish Smack audit rules
2469 * @krule: rule of interest, in Audit kernel representation format
2471 * This is used to filter Smack rules from remaining Audit ones.
2472 * If it's proved that this rule belongs to us, the
2473 * audit_rule_match hook will be called to do the final judgement.
2475 static int smack_audit_rule_known(struct audit_krule *krule)
2477 struct audit_field *f;
2480 for (i = 0; i < krule->field_count; i++) {
2481 f = &krule->fields[i];
2483 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
2491 * smack_audit_rule_match - Audit given object ?
2492 * @secid: security id for identifying the object to test
2493 * @field: audit rule flags given from user-space
2494 * @op: required testing operator
2495 * @vrule: smack internal rule presentation
2496 * @actx: audit context associated with the check
2498 * The core Audit hook. It's used to take the decision of
2499 * whether to audit or not to audit a given object.
2501 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
2502 struct audit_context *actx)
2508 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR,
2509 "Smack: missing rule\n");
2513 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
2516 smack = smack_from_secid(secid);
2519 * No need to do string comparisons. If a match occurs,
2520 * both pointers will point to the same smack_known
2523 if (op == AUDIT_EQUAL)
2524 return (rule == smack);
2525 if (op == AUDIT_NOT_EQUAL)
2526 return (rule != smack);
2532 * smack_audit_rule_free - free smack rule representation
2533 * @vrule: rule to be freed.
2535 * No memory was allocated.
2537 static void smack_audit_rule_free(void *vrule)
2542 #endif /* CONFIG_AUDIT */
2545 * smack_secid_to_secctx - return the smack label for a secid
2546 * @secid: incoming integer
2547 * @secdata: destination
2548 * @seclen: how long it is
2550 * Exists for networking code.
2552 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
2554 char *sp = smack_from_secid(secid);
2557 *seclen = strlen(sp);
2562 * smack_secctx_to_secid - return the secid for a smack label
2563 * @secdata: smack label
2564 * @seclen: how long result is
2565 * @secid: outgoing integer
2567 * Exists for audit and networking code.
2569 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
2571 *secid = smack_to_secid(secdata);
2576 * smack_release_secctx - don't do anything.
2581 * Exists to make sure nothing gets done, and properly
2583 static void smack_release_secctx(char *secdata, u32 seclen)
2587 struct security_operations smack_ops = {
2590 .ptrace_may_access = smack_ptrace_may_access,
2591 .ptrace_traceme = smack_ptrace_traceme,
2592 .capget = cap_capget,
2593 .capset = cap_capset,
2594 .capable = cap_capable,
2595 .syslog = smack_syslog,
2596 .settime = cap_settime,
2597 .vm_enough_memory = cap_vm_enough_memory,
2599 .bprm_apply_creds = cap_bprm_apply_creds,
2600 .bprm_set_security = cap_bprm_set_security,
2601 .bprm_secureexec = cap_bprm_secureexec,
2603 .sb_alloc_security = smack_sb_alloc_security,
2604 .sb_free_security = smack_sb_free_security,
2605 .sb_copy_data = smack_sb_copy_data,
2606 .sb_kern_mount = smack_sb_kern_mount,
2607 .sb_statfs = smack_sb_statfs,
2608 .sb_mount = smack_sb_mount,
2609 .sb_umount = smack_sb_umount,
2611 .inode_alloc_security = smack_inode_alloc_security,
2612 .inode_free_security = smack_inode_free_security,
2613 .inode_init_security = smack_inode_init_security,
2614 .inode_link = smack_inode_link,
2615 .inode_unlink = smack_inode_unlink,
2616 .inode_rmdir = smack_inode_rmdir,
2617 .inode_rename = smack_inode_rename,
2618 .inode_permission = smack_inode_permission,
2619 .inode_setattr = smack_inode_setattr,
2620 .inode_getattr = smack_inode_getattr,
2621 .inode_setxattr = smack_inode_setxattr,
2622 .inode_post_setxattr = smack_inode_post_setxattr,
2623 .inode_getxattr = smack_inode_getxattr,
2624 .inode_removexattr = smack_inode_removexattr,
2625 .inode_need_killpriv = cap_inode_need_killpriv,
2626 .inode_killpriv = cap_inode_killpriv,
2627 .inode_getsecurity = smack_inode_getsecurity,
2628 .inode_setsecurity = smack_inode_setsecurity,
2629 .inode_listsecurity = smack_inode_listsecurity,
2630 .inode_getsecid = smack_inode_getsecid,
2632 .file_permission = smack_file_permission,
2633 .file_alloc_security = smack_file_alloc_security,
2634 .file_free_security = smack_file_free_security,
2635 .file_ioctl = smack_file_ioctl,
2636 .file_lock = smack_file_lock,
2637 .file_fcntl = smack_file_fcntl,
2638 .file_set_fowner = smack_file_set_fowner,
2639 .file_send_sigiotask = smack_file_send_sigiotask,
2640 .file_receive = smack_file_receive,
2642 .cred_free = smack_cred_free,
2643 .cred_prepare = smack_cred_prepare,
2644 .cred_commit = smack_cred_commit,
2645 .task_fix_setuid = cap_task_fix_setuid,
2646 .task_setpgid = smack_task_setpgid,
2647 .task_getpgid = smack_task_getpgid,
2648 .task_getsid = smack_task_getsid,
2649 .task_getsecid = smack_task_getsecid,
2650 .task_setnice = smack_task_setnice,
2651 .task_setioprio = smack_task_setioprio,
2652 .task_getioprio = smack_task_getioprio,
2653 .task_setscheduler = smack_task_setscheduler,
2654 .task_getscheduler = smack_task_getscheduler,
2655 .task_movememory = smack_task_movememory,
2656 .task_kill = smack_task_kill,
2657 .task_wait = smack_task_wait,
2658 .task_to_inode = smack_task_to_inode,
2659 .task_prctl = cap_task_prctl,
2661 .ipc_permission = smack_ipc_permission,
2662 .ipc_getsecid = smack_ipc_getsecid,
2664 .msg_msg_alloc_security = smack_msg_msg_alloc_security,
2665 .msg_msg_free_security = smack_msg_msg_free_security,
2667 .msg_queue_alloc_security = smack_msg_queue_alloc_security,
2668 .msg_queue_free_security = smack_msg_queue_free_security,
2669 .msg_queue_associate = smack_msg_queue_associate,
2670 .msg_queue_msgctl = smack_msg_queue_msgctl,
2671 .msg_queue_msgsnd = smack_msg_queue_msgsnd,
2672 .msg_queue_msgrcv = smack_msg_queue_msgrcv,
2674 .shm_alloc_security = smack_shm_alloc_security,
2675 .shm_free_security = smack_shm_free_security,
2676 .shm_associate = smack_shm_associate,
2677 .shm_shmctl = smack_shm_shmctl,
2678 .shm_shmat = smack_shm_shmat,
2680 .sem_alloc_security = smack_sem_alloc_security,
2681 .sem_free_security = smack_sem_free_security,
2682 .sem_associate = smack_sem_associate,
2683 .sem_semctl = smack_sem_semctl,
2684 .sem_semop = smack_sem_semop,
2686 .netlink_send = cap_netlink_send,
2687 .netlink_recv = cap_netlink_recv,
2689 .d_instantiate = smack_d_instantiate,
2691 .getprocattr = smack_getprocattr,
2692 .setprocattr = smack_setprocattr,
2694 .unix_stream_connect = smack_unix_stream_connect,
2695 .unix_may_send = smack_unix_may_send,
2697 .socket_post_create = smack_socket_post_create,
2698 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
2699 .socket_getpeersec_stream = smack_socket_getpeersec_stream,
2700 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
2701 .sk_alloc_security = smack_sk_alloc_security,
2702 .sk_free_security = smack_sk_free_security,
2703 .sock_graft = smack_sock_graft,
2704 .inet_conn_request = smack_inet_conn_request,
2706 /* key management security hooks */
2708 .key_alloc = smack_key_alloc,
2709 .key_free = smack_key_free,
2710 .key_permission = smack_key_permission,
2711 #endif /* CONFIG_KEYS */
2715 .audit_rule_init = smack_audit_rule_init,
2716 .audit_rule_known = smack_audit_rule_known,
2717 .audit_rule_match = smack_audit_rule_match,
2718 .audit_rule_free = smack_audit_rule_free,
2719 #endif /* CONFIG_AUDIT */
2721 .secid_to_secctx = smack_secid_to_secctx,
2722 .secctx_to_secid = smack_secctx_to_secid,
2723 .release_secctx = smack_release_secctx,
2727 * smack_init - initialize the smack system
2731 static __init int smack_init(void)
2735 if (!security_module_enable(&smack_ops))
2738 printk(KERN_INFO "Smack: Initializing.\n");
2741 * Set the security state for the initial task.
2743 cred = (struct cred *) current->cred;
2744 cred->security = &smack_known_floor.smk_known;
2749 spin_lock_init(&smack_known_unset.smk_cipsolock);
2750 spin_lock_init(&smack_known_huh.smk_cipsolock);
2751 spin_lock_init(&smack_known_hat.smk_cipsolock);
2752 spin_lock_init(&smack_known_star.smk_cipsolock);
2753 spin_lock_init(&smack_known_floor.smk_cipsolock);
2754 spin_lock_init(&smack_known_invalid.smk_cipsolock);
2759 if (register_security(&smack_ops))
2760 panic("smack: Unable to register with kernel.\n");
2766 * Smack requires early initialization in order to label
2767 * all processes and objects when they are created.
2769 security_initcall(smack_init);