2 * NSA Security-Enhanced Linux (SELinux) security module
4 * This file contains the SELinux hook function implementations.
6 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
7 * Chris Vance, <cvance@nai.com>
8 * Wayne Salamon, <wsalamon@nai.com>
9 * James Morris <jmorris@redhat.com>
11 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
12 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
14 * <dgoeddel@trustedcs.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2,
18 * as published by the Free Software Foundation.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/ptrace.h>
26 #include <linux/errno.h>
27 #include <linux/sched.h>
28 #include <linux/security.h>
29 #include <linux/xattr.h>
30 #include <linux/capability.h>
31 #include <linux/unistd.h>
33 #include <linux/mman.h>
34 #include <linux/slab.h>
35 #include <linux/pagemap.h>
36 #include <linux/swap.h>
37 #include <linux/smp_lock.h>
38 #include <linux/spinlock.h>
39 #include <linux/syscalls.h>
40 #include <linux/file.h>
41 #include <linux/namei.h>
42 #include <linux/mount.h>
43 #include <linux/ext2_fs.h>
44 #include <linux/proc_fs.h>
46 #include <linux/netfilter_ipv4.h>
47 #include <linux/netfilter_ipv6.h>
48 #include <linux/tty.h>
50 #include <net/ip.h> /* for sysctl_local_port_range[] */
51 #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
52 #include <asm/uaccess.h>
53 #include <asm/semaphore.h>
54 #include <asm/ioctls.h>
55 #include <linux/bitops.h>
56 #include <linux/interrupt.h>
57 #include <linux/netdevice.h> /* for network interface checks */
58 #include <linux/netlink.h>
59 #include <linux/tcp.h>
60 #include <linux/udp.h>
61 #include <linux/quota.h>
62 #include <linux/un.h> /* for Unix socket types */
63 #include <net/af_unix.h> /* for Unix socket types */
64 #include <linux/parser.h>
65 #include <linux/nfs_mount.h>
67 #include <linux/hugetlb.h>
68 #include <linux/personality.h>
69 #include <linux/sysctl.h>
70 #include <linux/audit.h>
71 #include <linux/string.h>
72 #include <linux/selinux.h>
79 #define XATTR_SELINUX_SUFFIX "selinux"
80 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
82 extern unsigned int policydb_loaded_version;
83 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
84 extern int selinux_compat_net;
86 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
87 int selinux_enforcing = 0;
89 static int __init enforcing_setup(char *str)
91 selinux_enforcing = simple_strtol(str,NULL,0);
94 __setup("enforcing=", enforcing_setup);
97 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
98 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
100 static int __init selinux_enabled_setup(char *str)
102 selinux_enabled = simple_strtol(str, NULL, 0);
105 __setup("selinux=", selinux_enabled_setup);
107 int selinux_enabled = 1;
110 /* Original (dummy) security module. */
111 static struct security_operations *original_ops = NULL;
113 /* Minimal support for a secondary security module,
114 just to allow the use of the dummy or capability modules.
115 The owlsm module can alternatively be used as a secondary
116 module as long as CONFIG_OWLSM_FD is not enabled. */
117 static struct security_operations *secondary_ops = NULL;
119 /* Lists of inode and superblock security structures initialized
120 before the policy was loaded. */
121 static LIST_HEAD(superblock_security_head);
122 static DEFINE_SPINLOCK(sb_security_lock);
124 static kmem_cache_t *sel_inode_cache;
126 /* Return security context for a given sid or just the context
127 length if the buffer is null or length is 0 */
128 static int selinux_getsecurity(u32 sid, void *buffer, size_t size)
134 rc = security_sid_to_context(sid, &context, &len);
138 if (!buffer || !size)
139 goto getsecurity_exit;
143 goto getsecurity_exit;
145 memcpy(buffer, context, len);
152 /* Allocate and free functions for each kind of security blob. */
154 static int task_alloc_security(struct task_struct *task)
156 struct task_security_struct *tsec;
158 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
163 tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
164 task->security = tsec;
169 static void task_free_security(struct task_struct *task)
171 struct task_security_struct *tsec = task->security;
172 task->security = NULL;
176 static int inode_alloc_security(struct inode *inode)
178 struct task_security_struct *tsec = current->security;
179 struct inode_security_struct *isec;
181 isec = kmem_cache_alloc(sel_inode_cache, SLAB_KERNEL);
185 memset(isec, 0, sizeof(*isec));
186 init_MUTEX(&isec->sem);
187 INIT_LIST_HEAD(&isec->list);
189 isec->sid = SECINITSID_UNLABELED;
190 isec->sclass = SECCLASS_FILE;
191 isec->task_sid = tsec->sid;
192 inode->i_security = isec;
197 static void inode_free_security(struct inode *inode)
199 struct inode_security_struct *isec = inode->i_security;
200 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
202 spin_lock(&sbsec->isec_lock);
203 if (!list_empty(&isec->list))
204 list_del_init(&isec->list);
205 spin_unlock(&sbsec->isec_lock);
207 inode->i_security = NULL;
208 kmem_cache_free(sel_inode_cache, isec);
211 static int file_alloc_security(struct file *file)
213 struct task_security_struct *tsec = current->security;
214 struct file_security_struct *fsec;
216 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
221 fsec->sid = tsec->sid;
222 fsec->fown_sid = tsec->sid;
223 file->f_security = fsec;
228 static void file_free_security(struct file *file)
230 struct file_security_struct *fsec = file->f_security;
231 file->f_security = NULL;
235 static int superblock_alloc_security(struct super_block *sb)
237 struct superblock_security_struct *sbsec;
239 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
243 init_MUTEX(&sbsec->sem);
244 INIT_LIST_HEAD(&sbsec->list);
245 INIT_LIST_HEAD(&sbsec->isec_head);
246 spin_lock_init(&sbsec->isec_lock);
248 sbsec->sid = SECINITSID_UNLABELED;
249 sbsec->def_sid = SECINITSID_FILE;
250 sb->s_security = sbsec;
255 static void superblock_free_security(struct super_block *sb)
257 struct superblock_security_struct *sbsec = sb->s_security;
259 spin_lock(&sb_security_lock);
260 if (!list_empty(&sbsec->list))
261 list_del_init(&sbsec->list);
262 spin_unlock(&sb_security_lock);
264 sb->s_security = NULL;
268 static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
270 struct sk_security_struct *ssec;
272 if (family != PF_UNIX)
275 ssec = kzalloc(sizeof(*ssec), priority);
280 ssec->peer_sid = SECINITSID_UNLABELED;
281 sk->sk_security = ssec;
286 static void sk_free_security(struct sock *sk)
288 struct sk_security_struct *ssec = sk->sk_security;
290 if (sk->sk_family != PF_UNIX)
293 sk->sk_security = NULL;
297 /* The security server must be initialized before
298 any labeling or access decisions can be provided. */
299 extern int ss_initialized;
301 /* The file system's label must be initialized prior to use. */
303 static char *labeling_behaviors[6] = {
305 "uses transition SIDs",
307 "uses genfs_contexts",
308 "not configured for labeling",
309 "uses mountpoint labeling",
312 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
314 static inline int inode_doinit(struct inode *inode)
316 return inode_doinit_with_dentry(inode, NULL);
325 static match_table_t tokens = {
326 {Opt_context, "context=%s"},
327 {Opt_fscontext, "fscontext=%s"},
328 {Opt_defcontext, "defcontext=%s"},
331 #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
333 static int try_context_mount(struct super_block *sb, void *data)
335 char *context = NULL, *defcontext = NULL;
338 int alloc = 0, rc = 0, seen = 0;
339 struct task_security_struct *tsec = current->security;
340 struct superblock_security_struct *sbsec = sb->s_security;
345 name = sb->s_type->name;
347 if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
349 /* NFS we understand. */
350 if (!strcmp(name, "nfs")) {
351 struct nfs_mount_data *d = data;
353 if (d->version < NFS_MOUNT_VERSION)
357 context = d->context;
364 /* Standard string-based options. */
365 char *p, *options = data;
367 while ((p = strsep(&options, ",")) != NULL) {
369 substring_t args[MAX_OPT_ARGS];
374 token = match_token(p, tokens, args);
380 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
383 context = match_strdup(&args[0]);
394 if (seen & (Opt_context|Opt_fscontext)) {
396 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
399 context = match_strdup(&args[0]);
406 seen |= Opt_fscontext;
410 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
412 printk(KERN_WARNING "SELinux: "
413 "defcontext option is invalid "
414 "for this filesystem type\n");
417 if (seen & (Opt_context|Opt_defcontext)) {
419 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
422 defcontext = match_strdup(&args[0]);
429 seen |= Opt_defcontext;
434 printk(KERN_WARNING "SELinux: unknown mount "
446 rc = security_context_to_sid(context, strlen(context), &sid);
448 printk(KERN_WARNING "SELinux: security_context_to_sid"
449 "(%s) failed for (dev %s, type %s) errno=%d\n",
450 context, sb->s_id, name, rc);
454 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
455 FILESYSTEM__RELABELFROM, NULL);
459 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
460 FILESYSTEM__RELABELTO, NULL);
466 if (seen & Opt_context)
467 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
471 rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
473 printk(KERN_WARNING "SELinux: security_context_to_sid"
474 "(%s) failed for (dev %s, type %s) errno=%d\n",
475 defcontext, sb->s_id, name, rc);
479 if (sid == sbsec->def_sid)
482 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
483 FILESYSTEM__RELABELFROM, NULL);
487 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
488 FILESYSTEM__ASSOCIATE, NULL);
492 sbsec->def_sid = sid;
504 static int superblock_doinit(struct super_block *sb, void *data)
506 struct superblock_security_struct *sbsec = sb->s_security;
507 struct dentry *root = sb->s_root;
508 struct inode *inode = root->d_inode;
512 if (sbsec->initialized)
515 if (!ss_initialized) {
516 /* Defer initialization until selinux_complete_init,
517 after the initial policy is loaded and the security
518 server is ready to handle calls. */
519 spin_lock(&sb_security_lock);
520 if (list_empty(&sbsec->list))
521 list_add(&sbsec->list, &superblock_security_head);
522 spin_unlock(&sb_security_lock);
526 /* Determine the labeling behavior to use for this filesystem type. */
527 rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
529 printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
530 __FUNCTION__, sb->s_type->name, rc);
534 rc = try_context_mount(sb, data);
538 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
539 /* Make sure that the xattr handler exists and that no
540 error other than -ENODATA is returned by getxattr on
541 the root directory. -ENODATA is ok, as this may be
542 the first boot of the SELinux kernel before we have
543 assigned xattr values to the filesystem. */
544 if (!inode->i_op->getxattr) {
545 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
546 "xattr support\n", sb->s_id, sb->s_type->name);
550 rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
551 if (rc < 0 && rc != -ENODATA) {
552 if (rc == -EOPNOTSUPP)
553 printk(KERN_WARNING "SELinux: (dev %s, type "
554 "%s) has no security xattr handler\n",
555 sb->s_id, sb->s_type->name);
557 printk(KERN_WARNING "SELinux: (dev %s, type "
558 "%s) getxattr errno %d\n", sb->s_id,
559 sb->s_type->name, -rc);
564 if (strcmp(sb->s_type->name, "proc") == 0)
567 sbsec->initialized = 1;
569 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) {
570 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n",
571 sb->s_id, sb->s_type->name);
574 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n",
575 sb->s_id, sb->s_type->name,
576 labeling_behaviors[sbsec->behavior-1]);
579 /* Initialize the root inode. */
580 rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root);
582 /* Initialize any other inodes associated with the superblock, e.g.
583 inodes created prior to initial policy load or inodes created
584 during get_sb by a pseudo filesystem that directly
586 spin_lock(&sbsec->isec_lock);
588 if (!list_empty(&sbsec->isec_head)) {
589 struct inode_security_struct *isec =
590 list_entry(sbsec->isec_head.next,
591 struct inode_security_struct, list);
592 struct inode *inode = isec->inode;
593 spin_unlock(&sbsec->isec_lock);
594 inode = igrab(inode);
596 if (!IS_PRIVATE (inode))
600 spin_lock(&sbsec->isec_lock);
601 list_del_init(&isec->list);
604 spin_unlock(&sbsec->isec_lock);
610 static inline u16 inode_mode_to_security_class(umode_t mode)
612 switch (mode & S_IFMT) {
614 return SECCLASS_SOCK_FILE;
616 return SECCLASS_LNK_FILE;
618 return SECCLASS_FILE;
620 return SECCLASS_BLK_FILE;
624 return SECCLASS_CHR_FILE;
626 return SECCLASS_FIFO_FILE;
630 return SECCLASS_FILE;
633 static inline int default_protocol_stream(int protocol)
635 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
638 static inline int default_protocol_dgram(int protocol)
640 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
643 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
650 return SECCLASS_UNIX_STREAM_SOCKET;
652 return SECCLASS_UNIX_DGRAM_SOCKET;
659 if (default_protocol_stream(protocol))
660 return SECCLASS_TCP_SOCKET;
662 return SECCLASS_RAWIP_SOCKET;
664 if (default_protocol_dgram(protocol))
665 return SECCLASS_UDP_SOCKET;
667 return SECCLASS_RAWIP_SOCKET;
669 return SECCLASS_RAWIP_SOCKET;
675 return SECCLASS_NETLINK_ROUTE_SOCKET;
676 case NETLINK_FIREWALL:
677 return SECCLASS_NETLINK_FIREWALL_SOCKET;
678 case NETLINK_INET_DIAG:
679 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
681 return SECCLASS_NETLINK_NFLOG_SOCKET;
683 return SECCLASS_NETLINK_XFRM_SOCKET;
684 case NETLINK_SELINUX:
685 return SECCLASS_NETLINK_SELINUX_SOCKET;
687 return SECCLASS_NETLINK_AUDIT_SOCKET;
689 return SECCLASS_NETLINK_IP6FW_SOCKET;
690 case NETLINK_DNRTMSG:
691 return SECCLASS_NETLINK_DNRT_SOCKET;
692 case NETLINK_KOBJECT_UEVENT:
693 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
695 return SECCLASS_NETLINK_SOCKET;
698 return SECCLASS_PACKET_SOCKET;
700 return SECCLASS_KEY_SOCKET;
702 return SECCLASS_APPLETALK_SOCKET;
705 return SECCLASS_SOCKET;
708 #ifdef CONFIG_PROC_FS
709 static int selinux_proc_get_sid(struct proc_dir_entry *de,
714 char *buffer, *path, *end;
716 buffer = (char*)__get_free_page(GFP_KERNEL);
726 while (de && de != de->parent) {
727 buflen -= de->namelen + 1;
731 memcpy(end, de->name, de->namelen);
736 rc = security_genfs_sid("proc", path, tclass, sid);
737 free_page((unsigned long)buffer);
741 static int selinux_proc_get_sid(struct proc_dir_entry *de,
749 /* The inode's security attributes must be initialized before first use. */
750 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
752 struct superblock_security_struct *sbsec = NULL;
753 struct inode_security_struct *isec = inode->i_security;
755 struct dentry *dentry;
756 #define INITCONTEXTLEN 255
757 char *context = NULL;
762 if (isec->initialized)
767 if (isec->initialized)
770 sbsec = inode->i_sb->s_security;
771 if (!sbsec->initialized) {
772 /* Defer initialization until selinux_complete_init,
773 after the initial policy is loaded and the security
774 server is ready to handle calls. */
775 spin_lock(&sbsec->isec_lock);
776 if (list_empty(&isec->list))
777 list_add(&isec->list, &sbsec->isec_head);
778 spin_unlock(&sbsec->isec_lock);
782 switch (sbsec->behavior) {
783 case SECURITY_FS_USE_XATTR:
784 if (!inode->i_op->getxattr) {
785 isec->sid = sbsec->def_sid;
789 /* Need a dentry, since the xattr API requires one.
790 Life would be simpler if we could just pass the inode. */
792 /* Called from d_instantiate or d_splice_alias. */
793 dentry = dget(opt_dentry);
795 /* Called from selinux_complete_init, try to find a dentry. */
796 dentry = d_find_alias(inode);
799 printk(KERN_WARNING "%s: no dentry for dev=%s "
800 "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
805 len = INITCONTEXTLEN;
806 context = kmalloc(len, GFP_KERNEL);
812 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
815 /* Need a larger buffer. Query for the right size. */
816 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
824 context = kmalloc(len, GFP_KERNEL);
830 rc = inode->i_op->getxattr(dentry,
836 if (rc != -ENODATA) {
837 printk(KERN_WARNING "%s: getxattr returned "
838 "%d for dev=%s ino=%ld\n", __FUNCTION__,
839 -rc, inode->i_sb->s_id, inode->i_ino);
843 /* Map ENODATA to the default file SID */
844 sid = sbsec->def_sid;
847 rc = security_context_to_sid_default(context, rc, &sid,
850 printk(KERN_WARNING "%s: context_to_sid(%s) "
851 "returned %d for dev=%s ino=%ld\n",
852 __FUNCTION__, context, -rc,
853 inode->i_sb->s_id, inode->i_ino);
855 /* Leave with the unlabeled SID */
863 case SECURITY_FS_USE_TASK:
864 isec->sid = isec->task_sid;
866 case SECURITY_FS_USE_TRANS:
867 /* Default to the fs SID. */
868 isec->sid = sbsec->sid;
870 /* Try to obtain a transition SID. */
871 isec->sclass = inode_mode_to_security_class(inode->i_mode);
872 rc = security_transition_sid(isec->task_sid,
881 /* Default to the fs SID. */
882 isec->sid = sbsec->sid;
885 struct proc_inode *proci = PROC_I(inode);
887 isec->sclass = inode_mode_to_security_class(inode->i_mode);
888 rc = selinux_proc_get_sid(proci->pde,
899 isec->initialized = 1;
902 if (isec->sclass == SECCLASS_FILE)
903 isec->sclass = inode_mode_to_security_class(inode->i_mode);
910 /* Convert a Linux signal to an access vector. */
911 static inline u32 signal_to_av(int sig)
917 /* Commonly granted from child to parent. */
918 perm = PROCESS__SIGCHLD;
921 /* Cannot be caught or ignored */
922 perm = PROCESS__SIGKILL;
925 /* Cannot be caught or ignored */
926 perm = PROCESS__SIGSTOP;
929 /* All other signals. */
930 perm = PROCESS__SIGNAL;
937 /* Check permission betweeen a pair of tasks, e.g. signal checks,
938 fork check, ptrace check, etc. */
939 static int task_has_perm(struct task_struct *tsk1,
940 struct task_struct *tsk2,
943 struct task_security_struct *tsec1, *tsec2;
945 tsec1 = tsk1->security;
946 tsec2 = tsk2->security;
947 return avc_has_perm(tsec1->sid, tsec2->sid,
948 SECCLASS_PROCESS, perms, NULL);
951 /* Check whether a task is allowed to use a capability. */
952 static int task_has_capability(struct task_struct *tsk,
955 struct task_security_struct *tsec;
956 struct avc_audit_data ad;
958 tsec = tsk->security;
960 AVC_AUDIT_DATA_INIT(&ad,CAP);
964 return avc_has_perm(tsec->sid, tsec->sid,
965 SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad);
968 /* Check whether a task is allowed to use a system operation. */
969 static int task_has_system(struct task_struct *tsk,
972 struct task_security_struct *tsec;
974 tsec = tsk->security;
976 return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
977 SECCLASS_SYSTEM, perms, NULL);
980 /* Check whether a task has a particular permission to an inode.
981 The 'adp' parameter is optional and allows other audit
982 data to be passed (e.g. the dentry). */
983 static int inode_has_perm(struct task_struct *tsk,
986 struct avc_audit_data *adp)
988 struct task_security_struct *tsec;
989 struct inode_security_struct *isec;
990 struct avc_audit_data ad;
992 tsec = tsk->security;
993 isec = inode->i_security;
997 AVC_AUDIT_DATA_INIT(&ad, FS);
998 ad.u.fs.inode = inode;
1001 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
1004 /* Same as inode_has_perm, but pass explicit audit data containing
1005 the dentry to help the auditing code to more easily generate the
1006 pathname if needed. */
1007 static inline int dentry_has_perm(struct task_struct *tsk,
1008 struct vfsmount *mnt,
1009 struct dentry *dentry,
1012 struct inode *inode = dentry->d_inode;
1013 struct avc_audit_data ad;
1014 AVC_AUDIT_DATA_INIT(&ad,FS);
1016 ad.u.fs.dentry = dentry;
1017 return inode_has_perm(tsk, inode, av, &ad);
1020 /* Check whether a task can use an open file descriptor to
1021 access an inode in a given way. Check access to the
1022 descriptor itself, and then use dentry_has_perm to
1023 check a particular permission to the file.
1024 Access to the descriptor is implicitly granted if it
1025 has the same SID as the process. If av is zero, then
1026 access to the file is not checked, e.g. for cases
1027 where only the descriptor is affected like seek. */
1028 static int file_has_perm(struct task_struct *tsk,
1032 struct task_security_struct *tsec = tsk->security;
1033 struct file_security_struct *fsec = file->f_security;
1034 struct vfsmount *mnt = file->f_vfsmnt;
1035 struct dentry *dentry = file->f_dentry;
1036 struct inode *inode = dentry->d_inode;
1037 struct avc_audit_data ad;
1040 AVC_AUDIT_DATA_INIT(&ad, FS);
1042 ad.u.fs.dentry = dentry;
1044 if (tsec->sid != fsec->sid) {
1045 rc = avc_has_perm(tsec->sid, fsec->sid,
1053 /* av is zero if only checking access to the descriptor. */
1055 return inode_has_perm(tsk, inode, av, &ad);
1060 /* Check whether a task can create a file. */
1061 static int may_create(struct inode *dir,
1062 struct dentry *dentry,
1065 struct task_security_struct *tsec;
1066 struct inode_security_struct *dsec;
1067 struct superblock_security_struct *sbsec;
1069 struct avc_audit_data ad;
1072 tsec = current->security;
1073 dsec = dir->i_security;
1074 sbsec = dir->i_sb->s_security;
1076 AVC_AUDIT_DATA_INIT(&ad, FS);
1077 ad.u.fs.dentry = dentry;
1079 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
1080 DIR__ADD_NAME | DIR__SEARCH,
1085 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1086 newsid = tsec->create_sid;
1088 rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
1094 rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
1098 return avc_has_perm(newsid, sbsec->sid,
1099 SECCLASS_FILESYSTEM,
1100 FILESYSTEM__ASSOCIATE, &ad);
1103 /* Check whether a task can create a key. */
1104 static int may_create_key(u32 ksid,
1105 struct task_struct *ctx)
1107 struct task_security_struct *tsec;
1109 tsec = ctx->security;
1111 return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
1115 #define MAY_UNLINK 1
1118 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1119 static int may_link(struct inode *dir,
1120 struct dentry *dentry,
1124 struct task_security_struct *tsec;
1125 struct inode_security_struct *dsec, *isec;
1126 struct avc_audit_data ad;
1130 tsec = current->security;
1131 dsec = dir->i_security;
1132 isec = dentry->d_inode->i_security;
1134 AVC_AUDIT_DATA_INIT(&ad, FS);
1135 ad.u.fs.dentry = dentry;
1138 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1139 rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
1154 printk(KERN_WARNING "may_link: unrecognized kind %d\n", kind);
1158 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
1162 static inline int may_rename(struct inode *old_dir,
1163 struct dentry *old_dentry,
1164 struct inode *new_dir,
1165 struct dentry *new_dentry)
1167 struct task_security_struct *tsec;
1168 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1169 struct avc_audit_data ad;
1171 int old_is_dir, new_is_dir;
1174 tsec = current->security;
1175 old_dsec = old_dir->i_security;
1176 old_isec = old_dentry->d_inode->i_security;
1177 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1178 new_dsec = new_dir->i_security;
1180 AVC_AUDIT_DATA_INIT(&ad, FS);
1182 ad.u.fs.dentry = old_dentry;
1183 rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
1184 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1187 rc = avc_has_perm(tsec->sid, old_isec->sid,
1188 old_isec->sclass, FILE__RENAME, &ad);
1191 if (old_is_dir && new_dir != old_dir) {
1192 rc = avc_has_perm(tsec->sid, old_isec->sid,
1193 old_isec->sclass, DIR__REPARENT, &ad);
1198 ad.u.fs.dentry = new_dentry;
1199 av = DIR__ADD_NAME | DIR__SEARCH;
1200 if (new_dentry->d_inode)
1201 av |= DIR__REMOVE_NAME;
1202 rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1205 if (new_dentry->d_inode) {
1206 new_isec = new_dentry->d_inode->i_security;
1207 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1208 rc = avc_has_perm(tsec->sid, new_isec->sid,
1210 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1218 /* Check whether a task can perform a filesystem operation. */
1219 static int superblock_has_perm(struct task_struct *tsk,
1220 struct super_block *sb,
1222 struct avc_audit_data *ad)
1224 struct task_security_struct *tsec;
1225 struct superblock_security_struct *sbsec;
1227 tsec = tsk->security;
1228 sbsec = sb->s_security;
1229 return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
1233 /* Convert a Linux mode and permission mask to an access vector. */
1234 static inline u32 file_mask_to_av(int mode, int mask)
1238 if ((mode & S_IFMT) != S_IFDIR) {
1239 if (mask & MAY_EXEC)
1240 av |= FILE__EXECUTE;
1241 if (mask & MAY_READ)
1244 if (mask & MAY_APPEND)
1246 else if (mask & MAY_WRITE)
1250 if (mask & MAY_EXEC)
1252 if (mask & MAY_WRITE)
1254 if (mask & MAY_READ)
1261 /* Convert a Linux file to an access vector. */
1262 static inline u32 file_to_av(struct file *file)
1266 if (file->f_mode & FMODE_READ)
1268 if (file->f_mode & FMODE_WRITE) {
1269 if (file->f_flags & O_APPEND)
1278 /* Set an inode's SID to a specified value. */
1279 static int inode_security_set_sid(struct inode *inode, u32 sid)
1281 struct inode_security_struct *isec = inode->i_security;
1282 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
1284 if (!sbsec->initialized) {
1285 /* Defer initialization to selinux_complete_init. */
1290 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1292 isec->initialized = 1;
1297 /* Hook functions begin here. */
1299 static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
1301 struct task_security_struct *psec = parent->security;
1302 struct task_security_struct *csec = child->security;
1305 rc = secondary_ops->ptrace(parent,child);
1309 rc = task_has_perm(parent, child, PROCESS__PTRACE);
1310 /* Save the SID of the tracing process for later use in apply_creds. */
1311 if (!(child->ptrace & PT_PTRACED) && !rc)
1312 csec->ptrace_sid = psec->sid;
1316 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1317 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1321 error = task_has_perm(current, target, PROCESS__GETCAP);
1325 return secondary_ops->capget(target, effective, inheritable, permitted);
1328 static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
1329 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1333 error = secondary_ops->capset_check(target, effective, inheritable, permitted);
1337 return task_has_perm(current, target, PROCESS__SETCAP);
1340 static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
1341 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1343 secondary_ops->capset_set(target, effective, inheritable, permitted);
1346 static int selinux_capable(struct task_struct *tsk, int cap)
1350 rc = secondary_ops->capable(tsk, cap);
1354 return task_has_capability(tsk,cap);
1357 static int selinux_sysctl(ctl_table *table, int op)
1361 struct task_security_struct *tsec;
1365 rc = secondary_ops->sysctl(table, op);
1369 tsec = current->security;
1371 rc = selinux_proc_get_sid(table->de, (op == 001) ?
1372 SECCLASS_DIR : SECCLASS_FILE, &tsid);
1374 /* Default to the well-defined sysctl SID. */
1375 tsid = SECINITSID_SYSCTL;
1378 /* The op values are "defined" in sysctl.c, thereby creating
1379 * a bad coupling between this module and sysctl.c */
1381 error = avc_has_perm(tsec->sid, tsid,
1382 SECCLASS_DIR, DIR__SEARCH, NULL);
1390 error = avc_has_perm(tsec->sid, tsid,
1391 SECCLASS_FILE, av, NULL);
1397 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1410 rc = superblock_has_perm(current,
1412 FILESYSTEM__QUOTAMOD, NULL);
1417 rc = superblock_has_perm(current,
1419 FILESYSTEM__QUOTAGET, NULL);
1422 rc = 0; /* let the kernel handle invalid cmds */
1428 static int selinux_quota_on(struct dentry *dentry)
1430 return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
1433 static int selinux_syslog(int type)
1437 rc = secondary_ops->syslog(type);
1442 case 3: /* Read last kernel messages */
1443 case 10: /* Return size of the log buffer */
1444 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1446 case 6: /* Disable logging to console */
1447 case 7: /* Enable logging to console */
1448 case 8: /* Set level of messages printed to console */
1449 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1451 case 0: /* Close log */
1452 case 1: /* Open log */
1453 case 2: /* Read from log */
1454 case 4: /* Read/clear last kernel messages */
1455 case 5: /* Clear ring buffer */
1457 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1464 * Check that a process has enough memory to allocate a new virtual
1465 * mapping. 0 means there is enough memory for the allocation to
1466 * succeed and -ENOMEM implies there is not.
1468 * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1469 * if the capability is granted, but __vm_enough_memory requires 1 if
1470 * the capability is granted.
1472 * Do not audit the selinux permission check, as this is applied to all
1473 * processes that allocate mappings.
1475 static int selinux_vm_enough_memory(long pages)
1477 int rc, cap_sys_admin = 0;
1478 struct task_security_struct *tsec = current->security;
1480 rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
1482 rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1483 SECCLASS_CAPABILITY,
1484 CAP_TO_MASK(CAP_SYS_ADMIN),
1490 return __vm_enough_memory(pages, cap_sys_admin);
1493 /* binprm security operations */
1495 static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
1497 struct bprm_security_struct *bsec;
1499 bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
1504 bsec->sid = SECINITSID_UNLABELED;
1507 bprm->security = bsec;
1511 static int selinux_bprm_set_security(struct linux_binprm *bprm)
1513 struct task_security_struct *tsec;
1514 struct inode *inode = bprm->file->f_dentry->d_inode;
1515 struct inode_security_struct *isec;
1516 struct bprm_security_struct *bsec;
1518 struct avc_audit_data ad;
1521 rc = secondary_ops->bprm_set_security(bprm);
1525 bsec = bprm->security;
1530 tsec = current->security;
1531 isec = inode->i_security;
1533 /* Default to the current task SID. */
1534 bsec->sid = tsec->sid;
1536 /* Reset fs, key, and sock SIDs on execve. */
1537 tsec->create_sid = 0;
1538 tsec->keycreate_sid = 0;
1539 tsec->sockcreate_sid = 0;
1541 if (tsec->exec_sid) {
1542 newsid = tsec->exec_sid;
1543 /* Reset exec SID on execve. */
1546 /* Check for a default transition on this program. */
1547 rc = security_transition_sid(tsec->sid, isec->sid,
1548 SECCLASS_PROCESS, &newsid);
1553 AVC_AUDIT_DATA_INIT(&ad, FS);
1554 ad.u.fs.mnt = bprm->file->f_vfsmnt;
1555 ad.u.fs.dentry = bprm->file->f_dentry;
1557 if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
1560 if (tsec->sid == newsid) {
1561 rc = avc_has_perm(tsec->sid, isec->sid,
1562 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
1566 /* Check permissions for the transition. */
1567 rc = avc_has_perm(tsec->sid, newsid,
1568 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
1572 rc = avc_has_perm(newsid, isec->sid,
1573 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
1577 /* Clear any possibly unsafe personality bits on exec: */
1578 current->personality &= ~PER_CLEAR_ON_SETID;
1580 /* Set the security field to the new SID. */
1588 static int selinux_bprm_check_security (struct linux_binprm *bprm)
1590 return secondary_ops->bprm_check_security(bprm);
1594 static int selinux_bprm_secureexec (struct linux_binprm *bprm)
1596 struct task_security_struct *tsec = current->security;
1599 if (tsec->osid != tsec->sid) {
1600 /* Enable secure mode for SIDs transitions unless
1601 the noatsecure permission is granted between
1602 the two SIDs, i.e. ahp returns 0. */
1603 atsecure = avc_has_perm(tsec->osid, tsec->sid,
1605 PROCESS__NOATSECURE, NULL);
1608 return (atsecure || secondary_ops->bprm_secureexec(bprm));
1611 static void selinux_bprm_free_security(struct linux_binprm *bprm)
1613 kfree(bprm->security);
1614 bprm->security = NULL;
1617 extern struct vfsmount *selinuxfs_mount;
1618 extern struct dentry *selinux_null;
1620 /* Derived from fs/exec.c:flush_old_files. */
1621 static inline void flush_unauthorized_files(struct files_struct * files)
1623 struct avc_audit_data ad;
1624 struct file *file, *devnull = NULL;
1625 struct tty_struct *tty = current->signal->tty;
1626 struct fdtable *fdt;
1631 file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
1633 /* Revalidate access to controlling tty.
1634 Use inode_has_perm on the tty inode directly rather
1635 than using file_has_perm, as this particular open
1636 file may belong to another process and we are only
1637 interested in the inode-based check here. */
1638 struct inode *inode = file->f_dentry->d_inode;
1639 if (inode_has_perm(current, inode,
1640 FILE__READ | FILE__WRITE, NULL)) {
1641 /* Reset controlling tty. */
1642 current->signal->tty = NULL;
1643 current->signal->tty_old_pgrp = 0;
1649 /* Revalidate access to inherited open files. */
1651 AVC_AUDIT_DATA_INIT(&ad,FS);
1653 spin_lock(&files->file_lock);
1655 unsigned long set, i;
1660 fdt = files_fdtable(files);
1661 if (i >= fdt->max_fds || i >= fdt->max_fdset)
1663 set = fdt->open_fds->fds_bits[j];
1666 spin_unlock(&files->file_lock);
1667 for ( ; set ; i++,set >>= 1) {
1672 if (file_has_perm(current,
1674 file_to_av(file))) {
1676 fd = get_unused_fd();
1686 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
1693 fd_install(fd, devnull);
1698 spin_lock(&files->file_lock);
1701 spin_unlock(&files->file_lock);
1704 static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
1706 struct task_security_struct *tsec;
1707 struct bprm_security_struct *bsec;
1711 secondary_ops->bprm_apply_creds(bprm, unsafe);
1713 tsec = current->security;
1715 bsec = bprm->security;
1718 tsec->osid = tsec->sid;
1720 if (tsec->sid != sid) {
1721 /* Check for shared state. If not ok, leave SID
1722 unchanged and kill. */
1723 if (unsafe & LSM_UNSAFE_SHARE) {
1724 rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
1725 PROCESS__SHARE, NULL);
1732 /* Check for ptracing, and update the task SID if ok.
1733 Otherwise, leave SID unchanged and kill. */
1734 if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
1735 rc = avc_has_perm(tsec->ptrace_sid, sid,
1736 SECCLASS_PROCESS, PROCESS__PTRACE,
1748 * called after apply_creds without the task lock held
1750 static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
1752 struct task_security_struct *tsec;
1753 struct rlimit *rlim, *initrlim;
1754 struct itimerval itimer;
1755 struct bprm_security_struct *bsec;
1758 tsec = current->security;
1759 bsec = bprm->security;
1762 force_sig_specific(SIGKILL, current);
1765 if (tsec->osid == tsec->sid)
1768 /* Close files for which the new task SID is not authorized. */
1769 flush_unauthorized_files(current->files);
1771 /* Check whether the new SID can inherit signal state
1772 from the old SID. If not, clear itimers to avoid
1773 subsequent signal generation and flush and unblock
1774 signals. This must occur _after_ the task SID has
1775 been updated so that any kill done after the flush
1776 will be checked against the new SID. */
1777 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1778 PROCESS__SIGINH, NULL);
1780 memset(&itimer, 0, sizeof itimer);
1781 for (i = 0; i < 3; i++)
1782 do_setitimer(i, &itimer, NULL);
1783 flush_signals(current);
1784 spin_lock_irq(¤t->sighand->siglock);
1785 flush_signal_handlers(current, 1);
1786 sigemptyset(¤t->blocked);
1787 recalc_sigpending();
1788 spin_unlock_irq(¤t->sighand->siglock);
1791 /* Check whether the new SID can inherit resource limits
1792 from the old SID. If not, reset all soft limits to
1793 the lower of the current task's hard limit and the init
1794 task's soft limit. Note that the setting of hard limits
1795 (even to lower them) can be controlled by the setrlimit
1796 check. The inclusion of the init task's soft limit into
1797 the computation is to avoid resetting soft limits higher
1798 than the default soft limit for cases where the default
1799 is lower than the hard limit, e.g. RLIMIT_CORE or
1801 rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1802 PROCESS__RLIMITINH, NULL);
1804 for (i = 0; i < RLIM_NLIMITS; i++) {
1805 rlim = current->signal->rlim + i;
1806 initrlim = init_task.signal->rlim+i;
1807 rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur);
1809 if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
1811 * This will cause RLIMIT_CPU calculations
1814 current->it_prof_expires = jiffies_to_cputime(1);
1818 /* Wake up the parent if it is waiting so that it can
1819 recheck wait permission to the new task SID. */
1820 wake_up_interruptible(¤t->parent->signal->wait_chldexit);
1823 /* superblock security operations */
1825 static int selinux_sb_alloc_security(struct super_block *sb)
1827 return superblock_alloc_security(sb);
1830 static void selinux_sb_free_security(struct super_block *sb)
1832 superblock_free_security(sb);
1835 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
1840 return !memcmp(prefix, option, plen);
1843 static inline int selinux_option(char *option, int len)
1845 return (match_prefix("context=", sizeof("context=")-1, option, len) ||
1846 match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) ||
1847 match_prefix("defcontext=", sizeof("defcontext=")-1, option, len));
1850 static inline void take_option(char **to, char *from, int *first, int len)
1858 memcpy(*to, from, len);
1862 static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
1864 int fnosec, fsec, rc = 0;
1865 char *in_save, *in_curr, *in_end;
1866 char *sec_curr, *nosec_save, *nosec;
1871 /* Binary mount data: just copy */
1872 if (type->fs_flags & FS_BINARY_MOUNTDATA) {
1873 copy_page(sec_curr, in_curr);
1877 nosec = (char *)get_zeroed_page(GFP_KERNEL);
1885 in_save = in_end = orig;
1888 if (*in_end == ',' || *in_end == '\0') {
1889 int len = in_end - in_curr;
1891 if (selinux_option(in_curr, len))
1892 take_option(&sec_curr, in_curr, &fsec, len);
1894 take_option(&nosec, in_curr, &fnosec, len);
1896 in_curr = in_end + 1;
1898 } while (*in_end++);
1900 strcpy(in_save, nosec_save);
1901 free_page((unsigned long)nosec_save);
1906 static int selinux_sb_kern_mount(struct super_block *sb, void *data)
1908 struct avc_audit_data ad;
1911 rc = superblock_doinit(sb, data);
1915 AVC_AUDIT_DATA_INIT(&ad,FS);
1916 ad.u.fs.dentry = sb->s_root;
1917 return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
1920 static int selinux_sb_statfs(struct dentry *dentry)
1922 struct avc_audit_data ad;
1924 AVC_AUDIT_DATA_INIT(&ad,FS);
1925 ad.u.fs.dentry = dentry->d_sb->s_root;
1926 return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
1929 static int selinux_mount(char * dev_name,
1930 struct nameidata *nd,
1932 unsigned long flags,
1937 rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data);
1941 if (flags & MS_REMOUNT)
1942 return superblock_has_perm(current, nd->mnt->mnt_sb,
1943 FILESYSTEM__REMOUNT, NULL);
1945 return dentry_has_perm(current, nd->mnt, nd->dentry,
1949 static int selinux_umount(struct vfsmount *mnt, int flags)
1953 rc = secondary_ops->sb_umount(mnt, flags);
1957 return superblock_has_perm(current,mnt->mnt_sb,
1958 FILESYSTEM__UNMOUNT,NULL);
1961 /* inode security operations */
1963 static int selinux_inode_alloc_security(struct inode *inode)
1965 return inode_alloc_security(inode);
1968 static void selinux_inode_free_security(struct inode *inode)
1970 inode_free_security(inode);
1973 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
1974 char **name, void **value,
1977 struct task_security_struct *tsec;
1978 struct inode_security_struct *dsec;
1979 struct superblock_security_struct *sbsec;
1982 char *namep = NULL, *context;
1984 tsec = current->security;
1985 dsec = dir->i_security;
1986 sbsec = dir->i_sb->s_security;
1988 if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1989 newsid = tsec->create_sid;
1991 rc = security_transition_sid(tsec->sid, dsec->sid,
1992 inode_mode_to_security_class(inode->i_mode),
1995 printk(KERN_WARNING "%s: "
1996 "security_transition_sid failed, rc=%d (dev=%s "
1999 -rc, inode->i_sb->s_id, inode->i_ino);
2004 inode_security_set_sid(inode, newsid);
2006 if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2010 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
2017 rc = security_sid_to_context(newsid, &context, &clen);
2029 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2031 return may_create(dir, dentry, SECCLASS_FILE);
2034 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2038 rc = secondary_ops->inode_link(old_dentry,dir,new_dentry);
2041 return may_link(dir, old_dentry, MAY_LINK);
2044 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2048 rc = secondary_ops->inode_unlink(dir, dentry);
2051 return may_link(dir, dentry, MAY_UNLINK);
2054 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2056 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2059 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2061 return may_create(dir, dentry, SECCLASS_DIR);
2064 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2066 return may_link(dir, dentry, MAY_RMDIR);
2069 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2073 rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
2077 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2080 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2081 struct inode *new_inode, struct dentry *new_dentry)
2083 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2086 static int selinux_inode_readlink(struct dentry *dentry)
2088 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2091 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2095 rc = secondary_ops->inode_follow_link(dentry,nameidata);
2098 return dentry_has_perm(current, NULL, dentry, FILE__READ);
2101 static int selinux_inode_permission(struct inode *inode, int mask,
2102 struct nameidata *nd)
2106 rc = secondary_ops->inode_permission(inode, mask, nd);
2111 /* No permission to check. Existence test. */
2115 return inode_has_perm(current, inode,
2116 file_mask_to_av(inode->i_mode, mask), NULL);
2119 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2123 rc = secondary_ops->inode_setattr(dentry, iattr);
2127 if (iattr->ia_valid & ATTR_FORCE)
2130 if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2131 ATTR_ATIME_SET | ATTR_MTIME_SET))
2132 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2134 return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
2137 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2139 return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
2142 static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags)
2144 struct task_security_struct *tsec = current->security;
2145 struct inode *inode = dentry->d_inode;
2146 struct inode_security_struct *isec = inode->i_security;
2147 struct superblock_security_struct *sbsec;
2148 struct avc_audit_data ad;
2152 if (strcmp(name, XATTR_NAME_SELINUX)) {
2153 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2154 sizeof XATTR_SECURITY_PREFIX - 1) &&
2155 !capable(CAP_SYS_ADMIN)) {
2156 /* A different attribute in the security namespace.
2157 Restrict to administrator. */
2161 /* Not an attribute we recognize, so just check the
2162 ordinary setattr permission. */
2163 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2166 sbsec = inode->i_sb->s_security;
2167 if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2170 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
2173 AVC_AUDIT_DATA_INIT(&ad,FS);
2174 ad.u.fs.dentry = dentry;
2176 rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
2177 FILE__RELABELFROM, &ad);
2181 rc = security_context_to_sid(value, size, &newsid);
2185 rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
2186 FILE__RELABELTO, &ad);
2190 rc = security_validate_transition(isec->sid, newsid, tsec->sid,
2195 return avc_has_perm(newsid,
2197 SECCLASS_FILESYSTEM,
2198 FILESYSTEM__ASSOCIATE,
2202 static void selinux_inode_post_setxattr(struct dentry *dentry, char *name,
2203 void *value, size_t size, int flags)
2205 struct inode *inode = dentry->d_inode;
2206 struct inode_security_struct *isec = inode->i_security;
2210 if (strcmp(name, XATTR_NAME_SELINUX)) {
2211 /* Not an attribute we recognize, so nothing to do. */
2215 rc = security_context_to_sid(value, size, &newsid);
2217 printk(KERN_WARNING "%s: unable to obtain SID for context "
2218 "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc);
2226 static int selinux_inode_getxattr (struct dentry *dentry, char *name)
2228 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2231 static int selinux_inode_listxattr (struct dentry *dentry)
2233 return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2236 static int selinux_inode_removexattr (struct dentry *dentry, char *name)
2238 if (strcmp(name, XATTR_NAME_SELINUX)) {
2239 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2240 sizeof XATTR_SECURITY_PREFIX - 1) &&
2241 !capable(CAP_SYS_ADMIN)) {
2242 /* A different attribute in the security namespace.
2243 Restrict to administrator. */
2247 /* Not an attribute we recognize, so just check the
2248 ordinary setattr permission. Might want a separate
2249 permission for removexattr. */
2250 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2253 /* No one is allowed to remove a SELinux security label.
2254 You can change the label, but all data must be labeled. */
2258 static const char *selinux_inode_xattr_getsuffix(void)
2260 return XATTR_SELINUX_SUFFIX;
2264 * Copy the in-core inode security context value to the user. If the
2265 * getxattr() prior to this succeeded, check to see if we need to
2266 * canonicalize the value to be finally returned to the user.
2268 * Permission check is handled by selinux_inode_getxattr hook.
2270 static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
2272 struct inode_security_struct *isec = inode->i_security;
2274 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2277 return selinux_getsecurity(isec->sid, buffer, size);
2280 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2281 const void *value, size_t size, int flags)
2283 struct inode_security_struct *isec = inode->i_security;
2287 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2290 if (!value || !size)
2293 rc = security_context_to_sid((void*)value, size, &newsid);
2301 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2303 const int len = sizeof(XATTR_NAME_SELINUX);
2304 if (buffer && len <= buffer_size)
2305 memcpy(buffer, XATTR_NAME_SELINUX, len);
2309 /* file security operations */
2311 static int selinux_file_permission(struct file *file, int mask)
2313 struct inode *inode = file->f_dentry->d_inode;
2316 /* No permission to check. Existence test. */
2320 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2321 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2324 return file_has_perm(current, file,
2325 file_mask_to_av(inode->i_mode, mask));
2328 static int selinux_file_alloc_security(struct file *file)
2330 return file_alloc_security(file);
2333 static void selinux_file_free_security(struct file *file)
2335 file_free_security(file);
2338 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2350 case EXT2_IOC_GETFLAGS:
2352 case EXT2_IOC_GETVERSION:
2353 error = file_has_perm(current, file, FILE__GETATTR);
2356 case EXT2_IOC_SETFLAGS:
2358 case EXT2_IOC_SETVERSION:
2359 error = file_has_perm(current, file, FILE__SETATTR);
2362 /* sys_ioctl() checks */
2366 error = file_has_perm(current, file, 0);
2371 error = task_has_capability(current,CAP_SYS_TTY_CONFIG);
2374 /* default case assumes that the command will go
2375 * to the file's ioctl() function.
2378 error = file_has_perm(current, file, FILE__IOCTL);
2384 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2386 #ifndef CONFIG_PPC32
2387 if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2389 * We are making executable an anonymous mapping or a
2390 * private file mapping that will also be writable.
2391 * This has an additional check.
2393 int rc = task_has_perm(current, current, PROCESS__EXECMEM);
2400 /* read access is always possible with a mapping */
2401 u32 av = FILE__READ;
2403 /* write access only matters if the mapping is shared */
2404 if (shared && (prot & PROT_WRITE))
2407 if (prot & PROT_EXEC)
2408 av |= FILE__EXECUTE;
2410 return file_has_perm(current, file, av);
2415 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2416 unsigned long prot, unsigned long flags)
2420 rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
2424 if (selinux_checkreqprot)
2427 return file_map_prot_check(file, prot,
2428 (flags & MAP_TYPE) == MAP_SHARED);
2431 static int selinux_file_mprotect(struct vm_area_struct *vma,
2432 unsigned long reqprot,
2437 rc = secondary_ops->file_mprotect(vma, reqprot, prot);
2441 if (selinux_checkreqprot)
2444 #ifndef CONFIG_PPC32
2445 if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
2447 if (vma->vm_start >= vma->vm_mm->start_brk &&
2448 vma->vm_end <= vma->vm_mm->brk) {
2449 rc = task_has_perm(current, current,
2451 } else if (!vma->vm_file &&
2452 vma->vm_start <= vma->vm_mm->start_stack &&
2453 vma->vm_end >= vma->vm_mm->start_stack) {
2454 rc = task_has_perm(current, current, PROCESS__EXECSTACK);
2455 } else if (vma->vm_file && vma->anon_vma) {
2457 * We are making executable a file mapping that has
2458 * had some COW done. Since pages might have been
2459 * written, check ability to execute the possibly
2460 * modified content. This typically should only
2461 * occur for text relocations.
2463 rc = file_has_perm(current, vma->vm_file,
2471 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
2474 static int selinux_file_lock(struct file *file, unsigned int cmd)
2476 return file_has_perm(current, file, FILE__LOCK);
2479 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
2486 if (!file->f_dentry || !file->f_dentry->d_inode) {
2491 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
2492 err = file_has_perm(current, file,FILE__WRITE);
2501 /* Just check FD__USE permission */
2502 err = file_has_perm(current, file, 0);
2507 #if BITS_PER_LONG == 32
2512 if (!file->f_dentry || !file->f_dentry->d_inode) {
2516 err = file_has_perm(current, file, FILE__LOCK);
2523 static int selinux_file_set_fowner(struct file *file)
2525 struct task_security_struct *tsec;
2526 struct file_security_struct *fsec;
2528 tsec = current->security;
2529 fsec = file->f_security;
2530 fsec->fown_sid = tsec->sid;
2535 static int selinux_file_send_sigiotask(struct task_struct *tsk,
2536 struct fown_struct *fown, int signum)
2540 struct task_security_struct *tsec;
2541 struct file_security_struct *fsec;
2543 /* struct fown_struct is never outside the context of a struct file */
2544 file = (struct file *)((long)fown - offsetof(struct file,f_owner));
2546 tsec = tsk->security;
2547 fsec = file->f_security;
2550 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
2552 perm = signal_to_av(signum);
2554 return avc_has_perm(fsec->fown_sid, tsec->sid,
2555 SECCLASS_PROCESS, perm, NULL);
2558 static int selinux_file_receive(struct file *file)
2560 return file_has_perm(current, file, file_to_av(file));
2563 /* task security operations */
2565 static int selinux_task_create(unsigned long clone_flags)
2569 rc = secondary_ops->task_create(clone_flags);
2573 return task_has_perm(current, current, PROCESS__FORK);
2576 static int selinux_task_alloc_security(struct task_struct *tsk)
2578 struct task_security_struct *tsec1, *tsec2;
2581 tsec1 = current->security;
2583 rc = task_alloc_security(tsk);
2586 tsec2 = tsk->security;
2588 tsec2->osid = tsec1->osid;
2589 tsec2->sid = tsec1->sid;
2591 /* Retain the exec, fs, key, and sock SIDs across fork */
2592 tsec2->exec_sid = tsec1->exec_sid;
2593 tsec2->create_sid = tsec1->create_sid;
2594 tsec2->keycreate_sid = tsec1->keycreate_sid;
2595 tsec2->sockcreate_sid = tsec1->sockcreate_sid;
2597 /* Retain ptracer SID across fork, if any.
2598 This will be reset by the ptrace hook upon any
2599 subsequent ptrace_attach operations. */
2600 tsec2->ptrace_sid = tsec1->ptrace_sid;
2605 static void selinux_task_free_security(struct task_struct *tsk)
2607 task_free_security(tsk);
2610 static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2612 /* Since setuid only affects the current process, and
2613 since the SELinux controls are not based on the Linux
2614 identity attributes, SELinux does not need to control
2615 this operation. However, SELinux does control the use
2616 of the CAP_SETUID and CAP_SETGID capabilities using the
2621 static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2623 return secondary_ops->task_post_setuid(id0,id1,id2,flags);
2626 static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
2628 /* See the comment for setuid above. */
2632 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
2634 return task_has_perm(current, p, PROCESS__SETPGID);
2637 static int selinux_task_getpgid(struct task_struct *p)
2639 return task_has_perm(current, p, PROCESS__GETPGID);
2642 static int selinux_task_getsid(struct task_struct *p)
2644 return task_has_perm(current, p, PROCESS__GETSESSION);
2647 static int selinux_task_setgroups(struct group_info *group_info)
2649 /* See the comment for setuid above. */
2653 static int selinux_task_setnice(struct task_struct *p, int nice)
2657 rc = secondary_ops->task_setnice(p, nice);
2661 return task_has_perm(current,p, PROCESS__SETSCHED);
2664 static int selinux_task_setioprio(struct task_struct *p, int ioprio)
2666 return task_has_perm(current, p, PROCESS__SETSCHED);
2669 static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
2671 struct rlimit *old_rlim = current->signal->rlim + resource;
2674 rc = secondary_ops->task_setrlimit(resource, new_rlim);
2678 /* Control the ability to change the hard limit (whether
2679 lowering or raising it), so that the hard limit can
2680 later be used as a safe reset point for the soft limit
2681 upon context transitions. See selinux_bprm_apply_creds. */
2682 if (old_rlim->rlim_max != new_rlim->rlim_max)
2683 return task_has_perm(current, current, PROCESS__SETRLIMIT);
2688 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
2690 return task_has_perm(current, p, PROCESS__SETSCHED);
2693 static int selinux_task_getscheduler(struct task_struct *p)
2695 return task_has_perm(current, p, PROCESS__GETSCHED);
2698 static int selinux_task_movememory(struct task_struct *p)
2700 return task_has_perm(current, p, PROCESS__SETSCHED);
2703 static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig)
2708 rc = secondary_ops->task_kill(p, info, sig);
2712 if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
2716 perm = PROCESS__SIGNULL; /* null signal; existence test */
2718 perm = signal_to_av(sig);
2720 return task_has_perm(current, p, perm);
2723 static int selinux_task_prctl(int option,
2729 /* The current prctl operations do not appear to require
2730 any SELinux controls since they merely observe or modify
2731 the state of the current process. */
2735 static int selinux_task_wait(struct task_struct *p)
2739 perm = signal_to_av(p->exit_signal);
2741 return task_has_perm(p, current, perm);
2744 static void selinux_task_reparent_to_init(struct task_struct *p)
2746 struct task_security_struct *tsec;
2748 secondary_ops->task_reparent_to_init(p);
2751 tsec->osid = tsec->sid;
2752 tsec->sid = SECINITSID_KERNEL;
2756 static void selinux_task_to_inode(struct task_struct *p,
2757 struct inode *inode)
2759 struct task_security_struct *tsec = p->security;
2760 struct inode_security_struct *isec = inode->i_security;
2762 isec->sid = tsec->sid;
2763 isec->initialized = 1;
2767 /* Returns error only if unable to parse addresses */
2768 static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct avc_audit_data *ad)
2770 int offset, ihlen, ret = -EINVAL;
2771 struct iphdr _iph, *ih;
2773 offset = skb->nh.raw - skb->data;
2774 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
2778 ihlen = ih->ihl * 4;
2779 if (ihlen < sizeof(_iph))
2782 ad->u.net.v4info.saddr = ih->saddr;
2783 ad->u.net.v4info.daddr = ih->daddr;
2786 switch (ih->protocol) {
2788 struct tcphdr _tcph, *th;
2790 if (ntohs(ih->frag_off) & IP_OFFSET)
2794 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2798 ad->u.net.sport = th->source;
2799 ad->u.net.dport = th->dest;
2804 struct udphdr _udph, *uh;
2806 if (ntohs(ih->frag_off) & IP_OFFSET)
2810 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2814 ad->u.net.sport = uh->source;
2815 ad->u.net.dport = uh->dest;
2826 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2828 /* Returns error only if unable to parse addresses */
2829 static int selinux_parse_skb_ipv6(struct sk_buff *skb, struct avc_audit_data *ad)
2832 int ret = -EINVAL, offset;
2833 struct ipv6hdr _ipv6h, *ip6;
2835 offset = skb->nh.raw - skb->data;
2836 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
2840 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
2841 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
2844 nexthdr = ip6->nexthdr;
2845 offset += sizeof(_ipv6h);
2846 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
2852 struct tcphdr _tcph, *th;
2854 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2858 ad->u.net.sport = th->source;
2859 ad->u.net.dport = th->dest;
2864 struct udphdr _udph, *uh;
2866 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2870 ad->u.net.sport = uh->source;
2871 ad->u.net.dport = uh->dest;
2875 /* includes fragments */
2885 static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
2886 char **addrp, int *len, int src)
2890 switch (ad->u.net.family) {
2892 ret = selinux_parse_skb_ipv4(skb, ad);
2896 *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
2897 &ad->u.net.v4info.daddr);
2900 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2902 ret = selinux_parse_skb_ipv6(skb, ad);
2906 *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
2907 &ad->u.net.v6info.daddr);
2917 /* socket security operations */
2918 static int socket_has_perm(struct task_struct *task, struct socket *sock,
2921 struct inode_security_struct *isec;
2922 struct task_security_struct *tsec;
2923 struct avc_audit_data ad;
2926 tsec = task->security;
2927 isec = SOCK_INODE(sock)->i_security;
2929 if (isec->sid == SECINITSID_KERNEL)
2932 AVC_AUDIT_DATA_INIT(&ad,NET);
2933 ad.u.net.sk = sock->sk;
2934 err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
2940 static int selinux_socket_create(int family, int type,
2941 int protocol, int kern)
2944 struct task_security_struct *tsec;
2950 tsec = current->security;
2951 newsid = tsec->sockcreate_sid ? : tsec->sid;
2952 err = avc_has_perm(tsec->sid, newsid,
2953 socket_type_to_security_class(family, type,
2954 protocol), SOCKET__CREATE, NULL);
2960 static void selinux_socket_post_create(struct socket *sock, int family,
2961 int type, int protocol, int kern)
2963 struct inode_security_struct *isec;
2964 struct task_security_struct *tsec;
2967 isec = SOCK_INODE(sock)->i_security;
2969 tsec = current->security;
2970 newsid = tsec->sockcreate_sid ? : tsec->sid;
2971 isec->sclass = socket_type_to_security_class(family, type, protocol);
2972 isec->sid = kern ? SECINITSID_KERNEL : newsid;
2973 isec->initialized = 1;
2978 /* Range of port numbers used to automatically bind.
2979 Need to determine whether we should perform a name_bind
2980 permission check between the socket and the port number. */
2981 #define ip_local_port_range_0 sysctl_local_port_range[0]
2982 #define ip_local_port_range_1 sysctl_local_port_range[1]
2984 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
2989 err = socket_has_perm(current, sock, SOCKET__BIND);
2994 * If PF_INET or PF_INET6, check name_bind permission for the port.
2995 * Multiple address binding for SCTP is not supported yet: we just
2996 * check the first address now.
2998 family = sock->sk->sk_family;
2999 if (family == PF_INET || family == PF_INET6) {
3001 struct inode_security_struct *isec;
3002 struct task_security_struct *tsec;
3003 struct avc_audit_data ad;
3004 struct sockaddr_in *addr4 = NULL;
3005 struct sockaddr_in6 *addr6 = NULL;
3006 unsigned short snum;
3007 struct sock *sk = sock->sk;
3008 u32 sid, node_perm, addrlen;
3010 tsec = current->security;
3011 isec = SOCK_INODE(sock)->i_security;
3013 if (family == PF_INET) {
3014 addr4 = (struct sockaddr_in *)address;
3015 snum = ntohs(addr4->sin_port);
3016 addrlen = sizeof(addr4->sin_addr.s_addr);
3017 addrp = (char *)&addr4->sin_addr.s_addr;
3019 addr6 = (struct sockaddr_in6 *)address;
3020 snum = ntohs(addr6->sin6_port);
3021 addrlen = sizeof(addr6->sin6_addr.s6_addr);
3022 addrp = (char *)&addr6->sin6_addr.s6_addr;
3025 if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) ||
3026 snum > ip_local_port_range_1)) {
3027 err = security_port_sid(sk->sk_family, sk->sk_type,
3028 sk->sk_protocol, snum, &sid);
3031 AVC_AUDIT_DATA_INIT(&ad,NET);
3032 ad.u.net.sport = htons(snum);
3033 ad.u.net.family = family;
3034 err = avc_has_perm(isec->sid, sid,
3036 SOCKET__NAME_BIND, &ad);
3041 switch(isec->sclass) {
3042 case SECCLASS_TCP_SOCKET:
3043 node_perm = TCP_SOCKET__NODE_BIND;
3046 case SECCLASS_UDP_SOCKET:
3047 node_perm = UDP_SOCKET__NODE_BIND;
3051 node_perm = RAWIP_SOCKET__NODE_BIND;
3055 err = security_node_sid(family, addrp, addrlen, &sid);
3059 AVC_AUDIT_DATA_INIT(&ad,NET);
3060 ad.u.net.sport = htons(snum);
3061 ad.u.net.family = family;
3063 if (family == PF_INET)
3064 ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3066 ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3068 err = avc_has_perm(isec->sid, sid,
3069 isec->sclass, node_perm, &ad);
3077 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3079 struct inode_security_struct *isec;
3082 err = socket_has_perm(current, sock, SOCKET__CONNECT);
3087 * If a TCP socket, check name_connect permission for the port.
3089 isec = SOCK_INODE(sock)->i_security;
3090 if (isec->sclass == SECCLASS_TCP_SOCKET) {
3091 struct sock *sk = sock->sk;
3092 struct avc_audit_data ad;
3093 struct sockaddr_in *addr4 = NULL;
3094 struct sockaddr_in6 *addr6 = NULL;
3095 unsigned short snum;
3098 if (sk->sk_family == PF_INET) {
3099 addr4 = (struct sockaddr_in *)address;
3100 if (addrlen < sizeof(struct sockaddr_in))
3102 snum = ntohs(addr4->sin_port);
3104 addr6 = (struct sockaddr_in6 *)address;
3105 if (addrlen < SIN6_LEN_RFC2133)
3107 snum = ntohs(addr6->sin6_port);
3110 err = security_port_sid(sk->sk_family, sk->sk_type,
3111 sk->sk_protocol, snum, &sid);
3115 AVC_AUDIT_DATA_INIT(&ad,NET);
3116 ad.u.net.dport = htons(snum);
3117 ad.u.net.family = sk->sk_family;
3118 err = avc_has_perm(isec->sid, sid, isec->sclass,
3119 TCP_SOCKET__NAME_CONNECT, &ad);
3128 static int selinux_socket_listen(struct socket *sock, int backlog)
3130 return socket_has_perm(current, sock, SOCKET__LISTEN);
3133 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3136 struct inode_security_struct *isec;
3137 struct inode_security_struct *newisec;
3139 err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3143 newisec = SOCK_INODE(newsock)->i_security;
3145 isec = SOCK_INODE(sock)->i_security;
3146 newisec->sclass = isec->sclass;
3147 newisec->sid = isec->sid;
3148 newisec->initialized = 1;
3153 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3156 return socket_has_perm(current, sock, SOCKET__WRITE);
3159 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3160 int size, int flags)
3162 return socket_has_perm(current, sock, SOCKET__READ);
3165 static int selinux_socket_getsockname(struct socket *sock)
3167 return socket_has_perm(current, sock, SOCKET__GETATTR);
3170 static int selinux_socket_getpeername(struct socket *sock)
3172 return socket_has_perm(current, sock, SOCKET__GETATTR);
3175 static int selinux_socket_setsockopt(struct socket *sock,int level,int optname)
3177 return socket_has_perm(current, sock, SOCKET__SETOPT);
3180 static int selinux_socket_getsockopt(struct socket *sock, int level,
3183 return socket_has_perm(current, sock, SOCKET__GETOPT);
3186 static int selinux_socket_shutdown(struct socket *sock, int how)
3188 return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3191 static int selinux_socket_unix_stream_connect(struct socket *sock,
3192 struct socket *other,
3195 struct sk_security_struct *ssec;
3196 struct inode_security_struct *isec;
3197 struct inode_security_struct *other_isec;
3198 struct avc_audit_data ad;
3201 err = secondary_ops->unix_stream_connect(sock, other, newsk);
3205 isec = SOCK_INODE(sock)->i_security;
3206 other_isec = SOCK_INODE(other)->i_security;
3208 AVC_AUDIT_DATA_INIT(&ad,NET);
3209 ad.u.net.sk = other->sk;
3211 err = avc_has_perm(isec->sid, other_isec->sid,
3213 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3217 /* connecting socket */
3218 ssec = sock->sk->sk_security;
3219 ssec->peer_sid = other_isec->sid;
3221 /* server child socket */
3222 ssec = newsk->sk_security;
3223 ssec->peer_sid = isec->sid;
3228 static int selinux_socket_unix_may_send(struct socket *sock,
3229 struct socket *other)
3231 struct inode_security_struct *isec;
3232 struct inode_security_struct *other_isec;
3233 struct avc_audit_data ad;
3236 isec = SOCK_INODE(sock)->i_security;
3237 other_isec = SOCK_INODE(other)->i_security;
3239 AVC_AUDIT_DATA_INIT(&ad,NET);
3240 ad.u.net.sk = other->sk;
3242 err = avc_has_perm(isec->sid, other_isec->sid,
3243 isec->sclass, SOCKET__SENDTO, &ad);
3250 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
3251 struct avc_audit_data *ad, u32 sock_sid, u16 sock_class,
3252 u16 family, char *addrp, int len)
3255 u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3260 err = sel_netif_sids(skb->dev, &if_sid, NULL);
3264 switch (sock_class) {
3265 case SECCLASS_UDP_SOCKET:
3266 netif_perm = NETIF__UDP_RECV;
3267 node_perm = NODE__UDP_RECV;
3268 recv_perm = UDP_SOCKET__RECV_MSG;
3271 case SECCLASS_TCP_SOCKET:
3272 netif_perm = NETIF__TCP_RECV;
3273 node_perm = NODE__TCP_RECV;
3274 recv_perm = TCP_SOCKET__RECV_MSG;
3278 netif_perm = NETIF__RAWIP_RECV;
3279 node_perm = NODE__RAWIP_RECV;
3283 err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
3287 err = security_node_sid(family, addrp, len, &node_sid);
3291 err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, ad);
3298 err = security_port_sid(sk->sk_family, sk->sk_type,
3299 sk->sk_protocol, ntohs(ad->u.net.sport),
3304 err = avc_has_perm(sock_sid, port_sid,
3305 sock_class, recv_perm, ad);
3312 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3319 struct socket *sock;
3320 struct avc_audit_data ad;
3322 family = sk->sk_family;
3323 if (family != PF_INET && family != PF_INET6)
3326 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
3327 if (family == PF_INET6 && skb->protocol == ntohs(ETH_P_IP))
3330 read_lock_bh(&sk->sk_callback_lock);
3331 sock = sk->sk_socket;
3333 struct inode *inode;
3334 inode = SOCK_INODE(sock);
3336 struct inode_security_struct *isec;
3337 isec = inode->i_security;
3338 sock_sid = isec->sid;
3339 sock_class = isec->sclass;
3342 read_unlock_bh(&sk->sk_callback_lock);
3346 AVC_AUDIT_DATA_INIT(&ad, NET);
3347 ad.u.net.netif = skb->dev ? skb->dev->name : "[unknown]";
3348 ad.u.net.family = family;
3350 err = selinux_parse_skb(skb, &ad, &addrp, &len, 1);
3354 if (selinux_compat_net)
3355 err = selinux_sock_rcv_skb_compat(sk, skb, &ad, sock_sid,
3359 err = avc_has_perm(sock_sid, skb->secmark, SECCLASS_PACKET,
3364 err = selinux_xfrm_sock_rcv_skb(sock_sid, skb);
3369 static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
3370 int __user *optlen, unsigned len)
3375 struct sk_security_struct *ssec;
3376 struct inode_security_struct *isec;
3379 isec = SOCK_INODE(sock)->i_security;
3381 /* if UNIX_STREAM check peer_sid, if TCP check dst for labelled sa */
3382 if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET) {
3383 ssec = sock->sk->sk_security;
3384 peer_sid = ssec->peer_sid;
3386 else if (isec->sclass == SECCLASS_TCP_SOCKET) {
3387 peer_sid = selinux_socket_getpeer_stream(sock->sk);
3389 if (peer_sid == SECSID_NULL) {
3399 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
3404 if (scontext_len > len) {
3409 if (copy_to_user(optval, scontext, scontext_len))
3413 if (put_user(scontext_len, optlen))
3421 static int selinux_socket_getpeersec_dgram(struct sk_buff *skb, char **secdata, u32 *seclen)
3426 if (skb->sk->sk_family == PF_UNIX)
3427 selinux_get_inode_sid(SOCK_INODE(skb->sk->sk_socket),
3430 peer_sid = selinux_socket_getpeer_dgram(skb);
3432 if (peer_sid == SECSID_NULL)
3435 err = security_sid_to_context(peer_sid, secdata, seclen);
3442 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
3444 return sk_alloc_security(sk, family, priority);
3447 static void selinux_sk_free_security(struct sock *sk)
3449 sk_free_security(sk);
3452 static unsigned int selinux_sk_getsid_security(struct sock *sk, struct flowi *fl, u8 dir)
3454 struct inode_security_struct *isec;
3455 u32 sock_sid = SECINITSID_ANY_SOCKET;
3458 return selinux_no_sk_sid(fl);
3460 read_lock_bh(&sk->sk_callback_lock);
3461 isec = get_sock_isec(sk);
3464 sock_sid = isec->sid;
3466 read_unlock_bh(&sk->sk_callback_lock);
3470 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
3474 struct nlmsghdr *nlh;
3475 struct socket *sock = sk->sk_socket;
3476 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3478 if (skb->len < NLMSG_SPACE(0)) {
3482 nlh = (struct nlmsghdr *)skb->data;
3484 err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
3486 if (err == -EINVAL) {
3487 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
3488 "SELinux: unrecognized netlink message"
3489 " type=%hu for sclass=%hu\n",
3490 nlh->nlmsg_type, isec->sclass);
3491 if (!selinux_enforcing)
3501 err = socket_has_perm(current, sock, perm);
3506 #ifdef CONFIG_NETFILTER
3508 static int selinux_ip_postroute_last_compat(struct sock *sk, struct net_device *dev,
3509 struct inode_security_struct *isec,
3510 struct avc_audit_data *ad,
3511 u16 family, char *addrp, int len)
3514 u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
3516 err = sel_netif_sids(dev, &if_sid, NULL);
3520 switch (isec->sclass) {
3521 case SECCLASS_UDP_SOCKET:
3522 netif_perm = NETIF__UDP_SEND;
3523 node_perm = NODE__UDP_SEND;
3524 send_perm = UDP_SOCKET__SEND_MSG;
3527 case SECCLASS_TCP_SOCKET:
3528 netif_perm = NETIF__TCP_SEND;
3529 node_perm = NODE__TCP_SEND;
3530 send_perm = TCP_SOCKET__SEND_MSG;
3534 netif_perm = NETIF__RAWIP_SEND;
3535 node_perm = NODE__RAWIP_SEND;
3539 err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
3543 err = security_node_sid(family, addrp, len, &node_sid);
3547 err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, node_perm, ad);
3554 err = security_port_sid(sk->sk_family,
3557 ntohs(ad->u.net.dport),
3562 err = avc_has_perm(isec->sid, port_sid, isec->sclass,
3569 static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
3570 struct sk_buff **pskb,
3571 const struct net_device *in,
3572 const struct net_device *out,
3573 int (*okfn)(struct sk_buff *),
3579 struct socket *sock;
3580 struct inode *inode;
3581 struct sk_buff *skb = *pskb;
3582 struct inode_security_struct *isec;
3583 struct avc_audit_data ad;
3584 struct net_device *dev = (struct net_device *)out;
3590 sock = sk->sk_socket;
3594 inode = SOCK_INODE(sock);
3598 isec = inode->i_security;
3600 AVC_AUDIT_DATA_INIT(&ad, NET);
3601 ad.u.net.netif = dev->name;
3602 ad.u.net.family = family;
3604 err = selinux_parse_skb(skb, &ad, &addrp, &len, 0);
3608 if (selinux_compat_net)
3609 err = selinux_ip_postroute_last_compat(sk, dev, isec, &ad,
3610 family, addrp, len);
3612 err = avc_has_perm(isec->sid, skb->secmark, SECCLASS_PACKET,
3618 err = selinux_xfrm_postroute_last(isec->sid, skb);
3620 return err ? NF_DROP : NF_ACCEPT;
3623 static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
3624 struct sk_buff **pskb,
3625 const struct net_device *in,
3626 const struct net_device *out,
3627 int (*okfn)(struct sk_buff *))
3629 return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET);
3632 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3634 static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum,
3635 struct sk_buff **pskb,
3636 const struct net_device *in,
3637 const struct net_device *out,
3638 int (*okfn)(struct sk_buff *))
3640 return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6);
3645 #endif /* CONFIG_NETFILTER */
3647 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
3651 err = secondary_ops->netlink_send(sk, skb);
3655 if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
3656 err = selinux_nlmsg_perm(sk, skb);
3661 static int selinux_netlink_recv(struct sk_buff *skb, int capability)
3664 struct avc_audit_data ad;
3666 err = secondary_ops->netlink_recv(skb, capability);
3670 AVC_AUDIT_DATA_INIT(&ad, CAP);
3671 ad.u.cap = capability;
3673 return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
3674 SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
3677 static int ipc_alloc_security(struct task_struct *task,
3678 struct kern_ipc_perm *perm,
3681 struct task_security_struct *tsec = task->security;
3682 struct ipc_security_struct *isec;
3684 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
3688 isec->sclass = sclass;
3689 isec->ipc_perm = perm;
3690 isec->sid = tsec->sid;
3691 perm->security = isec;
3696 static void ipc_free_security(struct kern_ipc_perm *perm)
3698 struct ipc_security_struct *isec = perm->security;
3699 perm->security = NULL;
3703 static int msg_msg_alloc_security(struct msg_msg *msg)
3705 struct msg_security_struct *msec;
3707 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
3712 msec->sid = SECINITSID_UNLABELED;
3713 msg->security = msec;
3718 static void msg_msg_free_security(struct msg_msg *msg)
3720 struct msg_security_struct *msec = msg->security;
3722 msg->security = NULL;
3726 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
3729 struct task_security_struct *tsec;
3730 struct ipc_security_struct *isec;
3731 struct avc_audit_data ad;
3733 tsec = current->security;
3734 isec = ipc_perms->security;
3736 AVC_AUDIT_DATA_INIT(&ad, IPC);
3737 ad.u.ipc_id = ipc_perms->key;
3739 return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3742 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
3744 return msg_msg_alloc_security(msg);
3747 static void selinux_msg_msg_free_security(struct msg_msg *msg)
3749 msg_msg_free_security(msg);
3752 /* message queue security operations */
3753 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
3755 struct task_security_struct *tsec;
3756 struct ipc_security_struct *isec;
3757 struct avc_audit_data ad;
3760 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
3764 tsec = current->security;
3765 isec = msq->q_perm.security;
3767 AVC_AUDIT_DATA_INIT(&ad, IPC);
3768 ad.u.ipc_id = msq->q_perm.key;
3770 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3773 ipc_free_security(&msq->q_perm);
3779 static void selinux_msg_queue_free_security(struct msg_queue *msq)
3781 ipc_free_security(&msq->q_perm);
3784 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
3786 struct task_security_struct *tsec;
3787 struct ipc_security_struct *isec;
3788 struct avc_audit_data ad;
3790 tsec = current->security;
3791 isec = msq->q_perm.security;
3793 AVC_AUDIT_DATA_INIT(&ad, IPC);
3794 ad.u.ipc_id = msq->q_perm.key;
3796 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3797 MSGQ__ASSOCIATE, &ad);
3800 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3808 /* No specific object, just general system-wide information. */
3809 return task_has_system(current, SYSTEM__IPC_INFO);
3812 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
3815 perms = MSGQ__SETATTR;
3818 perms = MSGQ__DESTROY;
3824 err = ipc_has_perm(&msq->q_perm, perms);
3828 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
3830 struct task_security_struct *tsec;
3831 struct ipc_security_struct *isec;
3832 struct msg_security_struct *msec;
3833 struct avc_audit_data ad;
3836 tsec = current->security;
3837 isec = msq->q_perm.security;
3838 msec = msg->security;
3841 * First time through, need to assign label to the message
3843 if (msec->sid == SECINITSID_UNLABELED) {
3845 * Compute new sid based on current process and
3846 * message queue this message will be stored in
3848 rc = security_transition_sid(tsec->sid,
3856 AVC_AUDIT_DATA_INIT(&ad, IPC);
3857 ad.u.ipc_id = msq->q_perm.key;
3859 /* Can this process write to the queue? */
3860 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3863 /* Can this process send the message */
3864 rc = avc_has_perm(tsec->sid, msec->sid,
3865 SECCLASS_MSG, MSG__SEND, &ad);
3867 /* Can the message be put in the queue? */
3868 rc = avc_has_perm(msec->sid, isec->sid,
3869 SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
3874 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3875 struct task_struct *target,
3876 long type, int mode)
3878 struct task_security_struct *tsec;
3879 struct ipc_security_struct *isec;
3880 struct msg_security_struct *msec;
3881 struct avc_audit_data ad;
3884 tsec = target->security;
3885 isec = msq->q_perm.security;
3886 msec = msg->security;
3888 AVC_AUDIT_DATA_INIT(&ad, IPC);
3889 ad.u.ipc_id = msq->q_perm.key;
3891 rc = avc_has_perm(tsec->sid, isec->sid,
3892 SECCLASS_MSGQ, MSGQ__READ, &ad);
3894 rc = avc_has_perm(tsec->sid, msec->sid,
3895 SECCLASS_MSG, MSG__RECEIVE, &ad);
3899 /* Shared Memory security operations */
3900 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
3902 struct task_security_struct *tsec;
3903 struct ipc_security_struct *isec;
3904 struct avc_audit_data ad;
3907 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
3911 tsec = current->security;
3912 isec = shp->shm_perm.security;
3914 AVC_AUDIT_DATA_INIT(&ad, IPC);
3915 ad.u.ipc_id = shp->shm_perm.key;
3917 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3920 ipc_free_security(&shp->shm_perm);
3926 static void selinux_shm_free_security(struct shmid_kernel *shp)
3928 ipc_free_security(&shp->shm_perm);
3931 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
3933 struct task_security_struct *tsec;
3934 struct ipc_security_struct *isec;
3935 struct avc_audit_data ad;
3937 tsec = current->security;
3938 isec = shp->shm_perm.security;
3940 AVC_AUDIT_DATA_INIT(&ad, IPC);
3941 ad.u.ipc_id = shp->shm_perm.key;
3943 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3944 SHM__ASSOCIATE, &ad);
3947 /* Note, at this point, shp is locked down */
3948 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
3956 /* No specific object, just general system-wide information. */
3957 return task_has_system(current, SYSTEM__IPC_INFO);
3960 perms = SHM__GETATTR | SHM__ASSOCIATE;
3963 perms = SHM__SETATTR;
3970 perms = SHM__DESTROY;
3976 err = ipc_has_perm(&shp->shm_perm, perms);
3980 static int selinux_shm_shmat(struct shmid_kernel *shp,
3981 char __user *shmaddr, int shmflg)
3986 rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
3990 if (shmflg & SHM_RDONLY)
3993 perms = SHM__READ | SHM__WRITE;
3995 return ipc_has_perm(&shp->shm_perm, perms);
3998 /* Semaphore security operations */
3999 static int selinux_sem_alloc_security(struct sem_array *sma)
4001 struct task_security_struct *tsec;
4002 struct ipc_security_struct *isec;
4003 struct avc_audit_data ad;
4006 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
4010 tsec = current->security;
4011 isec = sma->sem_perm.security;
4013 AVC_AUDIT_DATA_INIT(&ad, IPC);
4014 ad.u.ipc_id = sma->sem_perm.key;
4016 rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
4019 ipc_free_security(&sma->sem_perm);
4025 static void selinux_sem_free_security(struct sem_array *sma)
4027 ipc_free_security(&sma->sem_perm);
4030 static int selinux_sem_associate(struct sem_array *sma, int semflg)
4032 struct task_security_struct *tsec;
4033 struct ipc_security_struct *isec;
4034 struct avc_audit_data ad;
4036 tsec = current->security;
4037 isec = sma->sem_perm.security;
4039 AVC_AUDIT_DATA_INIT(&ad, IPC);
4040 ad.u.ipc_id = sma->sem_perm.key;
4042 return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
4043 SEM__ASSOCIATE, &ad);
4046 /* Note, at this point, sma is locked down */
4047 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
4055 /* No specific object, just general system-wide information. */
4056 return task_has_system(current, SYSTEM__IPC_INFO);
4060 perms = SEM__GETATTR;
4071 perms = SEM__DESTROY;
4074 perms = SEM__SETATTR;
4078 perms = SEM__GETATTR | SEM__ASSOCIATE;
4084 err = ipc_has_perm(&sma->sem_perm, perms);
4088 static int selinux_sem_semop(struct sem_array *sma,
4089 struct sembuf *sops, unsigned nsops, int alter)
4094 perms = SEM__READ | SEM__WRITE;
4098 return ipc_has_perm(&sma->sem_perm, perms);
4101 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
4107 av |= IPC__UNIX_READ;
4109 av |= IPC__UNIX_WRITE;
4114 return ipc_has_perm(ipcp, av);
4117 /* module stacking operations */
4118 static int selinux_register_security (const char *name, struct security_operations *ops)
4120 if (secondary_ops != original_ops) {
4121 printk(KERN_INFO "%s: There is already a secondary security "
4122 "module registered.\n", __FUNCTION__);
4126 secondary_ops = ops;
4128 printk(KERN_INFO "%s: Registering secondary module %s\n",
4135 static int selinux_unregister_security (const char *name, struct security_operations *ops)
4137 if (ops != secondary_ops) {
4138 printk (KERN_INFO "%s: trying to unregister a security module "
4139 "that is not registered.\n", __FUNCTION__);
4143 secondary_ops = original_ops;
4148 static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode)
4151 inode_doinit_with_dentry(inode, dentry);
4154 static int selinux_getprocattr(struct task_struct *p,
4155 char *name, void *value, size_t size)
4157 struct task_security_struct *tsec;
4162 error = task_has_perm(current, p, PROCESS__GETATTR);
4169 if (!strcmp(name, "current"))
4171 else if (!strcmp(name, "prev"))
4173 else if (!strcmp(name, "exec"))
4174 sid = tsec->exec_sid;
4175 else if (!strcmp(name, "fscreate"))
4176 sid = tsec->create_sid;
4177 else if (!strcmp(name, "keycreate"))
4178 sid = tsec->keycreate_sid;
4179 else if (!strcmp(name, "sockcreate"))
4180 sid = tsec->sockcreate_sid;
4187 return selinux_getsecurity(sid, value, size);
4190 static int selinux_setprocattr(struct task_struct *p,
4191 char *name, void *value, size_t size)
4193 struct task_security_struct *tsec;
4199 /* SELinux only allows a process to change its own
4200 security attributes. */
4205 * Basic control over ability to set these attributes at all.
4206 * current == p, but we'll pass them separately in case the
4207 * above restriction is ever removed.
4209 if (!strcmp(name, "exec"))
4210 error = task_has_perm(current, p, PROCESS__SETEXEC);
4211 else if (!strcmp(name, "fscreate"))
4212 error = task_has_perm(current, p, PROCESS__SETFSCREATE);
4213 else if (!strcmp(name, "keycreate"))
4214 error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
4215 else if (!strcmp(name, "sockcreate"))
4216 error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
4217 else if (!strcmp(name, "current"))
4218 error = task_has_perm(current, p, PROCESS__SETCURRENT);
4224 /* Obtain a SID for the context, if one was specified. */
4225 if (size && str[1] && str[1] != '\n') {
4226 if (str[size-1] == '\n') {
4230 error = security_context_to_sid(value, size, &sid);
4235 /* Permission checking based on the specified context is
4236 performed during the actual operation (execve,
4237 open/mkdir/...), when we know the full context of the
4238 operation. See selinux_bprm_set_security for the execve
4239 checks and may_create for the file creation checks. The
4240 operation will then fail if the context is not permitted. */
4242 if (!strcmp(name, "exec"))
4243 tsec->exec_sid = sid;
4244 else if (!strcmp(name, "fscreate"))
4245 tsec->create_sid = sid;
4246 else if (!strcmp(name, "keycreate")) {
4247 error = may_create_key(sid, p);
4250 tsec->keycreate_sid = sid;
4251 } else if (!strcmp(name, "sockcreate"))
4252 tsec->sockcreate_sid = sid;
4253 else if (!strcmp(name, "current")) {
4254 struct av_decision avd;
4259 /* Only allow single threaded processes to change context */
4260 if (atomic_read(&p->mm->mm_users) != 1) {
4261 struct task_struct *g, *t;
4262 struct mm_struct *mm = p->mm;
4263 read_lock(&tasklist_lock);
4264 do_each_thread(g, t)
4265 if (t->mm == mm && t != p) {
4266 read_unlock(&tasklist_lock);
4269 while_each_thread(g, t);
4270 read_unlock(&tasklist_lock);
4273 /* Check permissions for the transition. */
4274 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
4275 PROCESS__DYNTRANSITION, NULL);
4279 /* Check for ptracing, and update the task SID if ok.
4280 Otherwise, leave SID unchanged and fail. */
4282 if (p->ptrace & PT_PTRACED) {
4283 error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
4285 PROCESS__PTRACE, &avd);
4289 avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS,
4290 PROCESS__PTRACE, &avd, error, NULL);
4306 static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
4307 unsigned long flags)
4309 struct task_security_struct *tsec = tsk->security;
4310 struct key_security_struct *ksec;
4312 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
4317 if (tsec->keycreate_sid)
4318 ksec->sid = tsec->keycreate_sid;
4320 ksec->sid = tsec->sid;
4326 static void selinux_key_free(struct key *k)
4328 struct key_security_struct *ksec = k->security;
4334 static int selinux_key_permission(key_ref_t key_ref,
4335 struct task_struct *ctx,
4339 struct task_security_struct *tsec;
4340 struct key_security_struct *ksec;
4342 key = key_ref_to_ptr(key_ref);
4344 tsec = ctx->security;
4345 ksec = key->security;
4347 /* if no specific permissions are requested, we skip the
4348 permission check. No serious, additional covert channels
4349 appear to be created. */
4353 return avc_has_perm(tsec->sid, ksec->sid,
4354 SECCLASS_KEY, perm, NULL);
4359 static struct security_operations selinux_ops = {
4360 .ptrace = selinux_ptrace,
4361 .capget = selinux_capget,
4362 .capset_check = selinux_capset_check,
4363 .capset_set = selinux_capset_set,
4364 .sysctl = selinux_sysctl,
4365 .capable = selinux_capable,
4366 .quotactl = selinux_quotactl,
4367 .quota_on = selinux_quota_on,
4368 .syslog = selinux_syslog,
4369 .vm_enough_memory = selinux_vm_enough_memory,
4371 .netlink_send = selinux_netlink_send,
4372 .netlink_recv = selinux_netlink_recv,
4374 .bprm_alloc_security = selinux_bprm_alloc_security,
4375 .bprm_free_security = selinux_bprm_free_security,
4376 .bprm_apply_creds = selinux_bprm_apply_creds,
4377 .bprm_post_apply_creds = selinux_bprm_post_apply_creds,
4378 .bprm_set_security = selinux_bprm_set_security,
4379 .bprm_check_security = selinux_bprm_check_security,
4380 .bprm_secureexec = selinux_bprm_secureexec,
4382 .sb_alloc_security = selinux_sb_alloc_security,
4383 .sb_free_security = selinux_sb_free_security,
4384 .sb_copy_data = selinux_sb_copy_data,
4385 .sb_kern_mount = selinux_sb_kern_mount,
4386 .sb_statfs = selinux_sb_statfs,
4387 .sb_mount = selinux_mount,
4388 .sb_umount = selinux_umount,
4390 .inode_alloc_security = selinux_inode_alloc_security,
4391 .inode_free_security = selinux_inode_free_security,
4392 .inode_init_security = selinux_inode_init_security,
4393 .inode_create = selinux_inode_create,
4394 .inode_link = selinux_inode_link,
4395 .inode_unlink = selinux_inode_unlink,
4396 .inode_symlink = selinux_inode_symlink,
4397 .inode_mkdir = selinux_inode_mkdir,
4398 .inode_rmdir = selinux_inode_rmdir,
4399 .inode_mknod = selinux_inode_mknod,
4400 .inode_rename = selinux_inode_rename,
4401 .inode_readlink = selinux_inode_readlink,
4402 .inode_follow_link = selinux_inode_follow_link,
4403 .inode_permission = selinux_inode_permission,
4404 .inode_setattr = selinux_inode_setattr,
4405 .inode_getattr = selinux_inode_getattr,
4406 .inode_setxattr = selinux_inode_setxattr,
4407 .inode_post_setxattr = selinux_inode_post_setxattr,
4408 .inode_getxattr = selinux_inode_getxattr,
4409 .inode_listxattr = selinux_inode_listxattr,
4410 .inode_removexattr = selinux_inode_removexattr,
4411 .inode_xattr_getsuffix = selinux_inode_xattr_getsuffix,
4412 .inode_getsecurity = selinux_inode_getsecurity,
4413 .inode_setsecurity = selinux_inode_setsecurity,
4414 .inode_listsecurity = selinux_inode_listsecurity,
4416 .file_permission = selinux_file_permission,
4417 .file_alloc_security = selinux_file_alloc_security,
4418 .file_free_security = selinux_file_free_security,
4419 .file_ioctl = selinux_file_ioctl,
4420 .file_mmap = selinux_file_mmap,
4421 .file_mprotect = selinux_file_mprotect,
4422 .file_lock = selinux_file_lock,
4423 .file_fcntl = selinux_file_fcntl,
4424 .file_set_fowner = selinux_file_set_fowner,
4425 .file_send_sigiotask = selinux_file_send_sigiotask,
4426 .file_receive = selinux_file_receive,
4428 .task_create = selinux_task_create,
4429 .task_alloc_security = selinux_task_alloc_security,
4430 .task_free_security = selinux_task_free_security,
4431 .task_setuid = selinux_task_setuid,
4432 .task_post_setuid = selinux_task_post_setuid,
4433 .task_setgid = selinux_task_setgid,
4434 .task_setpgid = selinux_task_setpgid,
4435 .task_getpgid = selinux_task_getpgid,
4436 .task_getsid = selinux_task_getsid,
4437 .task_setgroups = selinux_task_setgroups,
4438 .task_setnice = selinux_task_setnice,
4439 .task_setioprio = selinux_task_setioprio,
4440 .task_setrlimit = selinux_task_setrlimit,
4441 .task_setscheduler = selinux_task_setscheduler,
4442 .task_getscheduler = selinux_task_getscheduler,
4443 .task_movememory = selinux_task_movememory,
4444 .task_kill = selinux_task_kill,
4445 .task_wait = selinux_task_wait,
4446 .task_prctl = selinux_task_prctl,
4447 .task_reparent_to_init = selinux_task_reparent_to_init,
4448 .task_to_inode = selinux_task_to_inode,
4450 .ipc_permission = selinux_ipc_permission,
4452 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
4453 .msg_msg_free_security = selinux_msg_msg_free_security,
4455 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
4456 .msg_queue_free_security = selinux_msg_queue_free_security,
4457 .msg_queue_associate = selinux_msg_queue_associate,
4458 .msg_queue_msgctl = selinux_msg_queue_msgctl,
4459 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
4460 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
4462 .shm_alloc_security = selinux_shm_alloc_security,
4463 .shm_free_security = selinux_shm_free_security,
4464 .shm_associate = selinux_shm_associate,
4465 .shm_shmctl = selinux_shm_shmctl,
4466 .shm_shmat = selinux_shm_shmat,
4468 .sem_alloc_security = selinux_sem_alloc_security,
4469 .sem_free_security = selinux_sem_free_security,
4470 .sem_associate = selinux_sem_associate,
4471 .sem_semctl = selinux_sem_semctl,
4472 .sem_semop = selinux_sem_semop,
4474 .register_security = selinux_register_security,
4475 .unregister_security = selinux_unregister_security,
4477 .d_instantiate = selinux_d_instantiate,
4479 .getprocattr = selinux_getprocattr,
4480 .setprocattr = selinux_setprocattr,
4482 .unix_stream_connect = selinux_socket_unix_stream_connect,
4483 .unix_may_send = selinux_socket_unix_may_send,
4485 .socket_create = selinux_socket_create,
4486 .socket_post_create = selinux_socket_post_create,
4487 .socket_bind = selinux_socket_bind,
4488 .socket_connect = selinux_socket_connect,
4489 .socket_listen = selinux_socket_listen,
4490 .socket_accept = selinux_socket_accept,
4491 .socket_sendmsg = selinux_socket_sendmsg,
4492 .socket_recvmsg = selinux_socket_recvmsg,
4493 .socket_getsockname = selinux_socket_getsockname,
4494 .socket_getpeername = selinux_socket_getpeername,
4495 .socket_getsockopt = selinux_socket_getsockopt,
4496 .socket_setsockopt = selinux_socket_setsockopt,
4497 .socket_shutdown = selinux_socket_shutdown,
4498 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
4499 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
4500 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
4501 .sk_alloc_security = selinux_sk_alloc_security,
4502 .sk_free_security = selinux_sk_free_security,
4503 .sk_getsid = selinux_sk_getsid_security,
4505 #ifdef CONFIG_SECURITY_NETWORK_XFRM
4506 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
4507 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
4508 .xfrm_policy_free_security = selinux_xfrm_policy_free,
4509 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
4510 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
4511 .xfrm_state_free_security = selinux_xfrm_state_free,
4512 .xfrm_state_delete_security = selinux_xfrm_state_delete,
4513 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
4517 .key_alloc = selinux_key_alloc,
4518 .key_free = selinux_key_free,
4519 .key_permission = selinux_key_permission,
4523 static __init int selinux_init(void)
4525 struct task_security_struct *tsec;
4527 if (!selinux_enabled) {
4528 printk(KERN_INFO "SELinux: Disabled at boot.\n");
4532 printk(KERN_INFO "SELinux: Initializing.\n");
4534 /* Set the security state for the initial task. */
4535 if (task_alloc_security(current))
4536 panic("SELinux: Failed to initialize initial task.\n");
4537 tsec = current->security;
4538 tsec->osid = tsec->sid = SECINITSID_KERNEL;
4540 sel_inode_cache = kmem_cache_create("selinux_inode_security",
4541 sizeof(struct inode_security_struct),
4542 0, SLAB_PANIC, NULL, NULL);
4545 original_ops = secondary_ops = security_ops;
4547 panic ("SELinux: No initial security operations\n");
4548 if (register_security (&selinux_ops))
4549 panic("SELinux: Unable to register with kernel.\n");
4551 if (selinux_enforcing) {
4552 printk(KERN_INFO "SELinux: Starting in enforcing mode\n");
4554 printk(KERN_INFO "SELinux: Starting in permissive mode\n");
4558 /* Add security information to initial keyrings */
4559 selinux_key_alloc(&root_user_keyring, current,
4560 KEY_ALLOC_NOT_IN_QUOTA);
4561 selinux_key_alloc(&root_session_keyring, current,
4562 KEY_ALLOC_NOT_IN_QUOTA);
4568 void selinux_complete_init(void)
4570 printk(KERN_INFO "SELinux: Completing initialization.\n");
4572 /* Set up any superblocks initialized prior to the policy load. */
4573 printk(KERN_INFO "SELinux: Setting up existing superblocks.\n");
4574 spin_lock(&sb_lock);
4575 spin_lock(&sb_security_lock);
4577 if (!list_empty(&superblock_security_head)) {
4578 struct superblock_security_struct *sbsec =
4579 list_entry(superblock_security_head.next,
4580 struct superblock_security_struct,
4582 struct super_block *sb = sbsec->sb;
4584 spin_unlock(&sb_security_lock);
4585 spin_unlock(&sb_lock);
4586 down_read(&sb->s_umount);
4588 superblock_doinit(sb, NULL);
4590 spin_lock(&sb_lock);
4591 spin_lock(&sb_security_lock);
4592 list_del_init(&sbsec->list);
4595 spin_unlock(&sb_security_lock);
4596 spin_unlock(&sb_lock);
4599 /* SELinux requires early initialization in order to label
4600 all processes and objects when they are created. */
4601 security_initcall(selinux_init);
4603 #if defined(CONFIG_NETFILTER)
4605 static struct nf_hook_ops selinux_ipv4_op = {
4606 .hook = selinux_ipv4_postroute_last,
4607 .owner = THIS_MODULE,
4609 .hooknum = NF_IP_POST_ROUTING,
4610 .priority = NF_IP_PRI_SELINUX_LAST,
4613 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4615 static struct nf_hook_ops selinux_ipv6_op = {
4616 .hook = selinux_ipv6_postroute_last,
4617 .owner = THIS_MODULE,
4619 .hooknum = NF_IP6_POST_ROUTING,
4620 .priority = NF_IP6_PRI_SELINUX_LAST,
4625 static int __init selinux_nf_ip_init(void)
4629 if (!selinux_enabled)
4632 printk(KERN_INFO "SELinux: Registering netfilter hooks\n");
4634 err = nf_register_hook(&selinux_ipv4_op);
4636 panic("SELinux: nf_register_hook for IPv4: error %d\n", err);
4638 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4640 err = nf_register_hook(&selinux_ipv6_op);
4642 panic("SELinux: nf_register_hook for IPv6: error %d\n", err);
4650 __initcall(selinux_nf_ip_init);
4652 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4653 static void selinux_nf_ip_exit(void)
4655 printk(KERN_INFO "SELinux: Unregistering netfilter hooks\n");
4657 nf_unregister_hook(&selinux_ipv4_op);
4658 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4659 nf_unregister_hook(&selinux_ipv6_op);
4664 #else /* CONFIG_NETFILTER */
4666 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4667 #define selinux_nf_ip_exit()
4670 #endif /* CONFIG_NETFILTER */
4672 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4673 int selinux_disable(void)
4675 extern void exit_sel_fs(void);
4676 static int selinux_disabled = 0;
4678 if (ss_initialized) {
4679 /* Not permitted after initial policy load. */
4683 if (selinux_disabled) {
4684 /* Only do this once. */
4688 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
4690 selinux_disabled = 1;
4691 selinux_enabled = 0;
4693 /* Reset security_ops to the secondary module, dummy or capability. */
4694 security_ops = secondary_ops;
4696 /* Unregister netfilter hooks. */
4697 selinux_nf_ip_exit();
4699 /* Unregister selinuxfs. */