hooks.c 129.2 KB
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/*
 *  NSA Security-Enhanced Linux (SELinux) security module
 *
 *  This file contains the SELinux hook function implementations.
 *
 *  Authors:  Stephen Smalley, <sds@epoch.ncsc.mil>
 *            Chris Vance, <cvance@nai.com>
 *            Wayne Salamon, <wsalamon@nai.com>
 *            James Morris <jmorris@redhat.com>
 *
 *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
 *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
 *  Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
 *                          <dgoeddel@trustedcs.com>
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 *  Copyright (C) 2006 Hewlett-Packard Development Company, L.P.
 *                     Paul Moore, <paul.moore@hp.com>
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 *  Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
 *                     Yuichi Nakamura <ynakam@hitachisoft.jp>
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 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License version 2,
 *      as published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/security.h>
#include <linux/xattr.h>
#include <linux/capability.h>
#include <linux/unistd.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/spinlock.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/ext2_fs.h>
#include <linux/proc_fs.h>
#include <linux/kd.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/tty.h>
#include <net/icmp.h>
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#include <net/ip.h>		/* for local_port_range[] */
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#include <net/tcp.h>		/* struct or_callable used in sock_rcv_skb */
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>	/* for network interface checks */
#include <linux/netlink.h>
#include <linux/tcp.h>
#include <linux/udp.h>
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#include <linux/dccp.h>
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#include <linux/quota.h>
#include <linux/un.h>		/* for Unix socket types */
#include <net/af_unix.h>	/* for Unix socket types */
#include <linux/parser.h>
#include <linux/nfs_mount.h>
#include <net/ipv6.h>
#include <linux/hugetlb.h>
#include <linux/personality.h>
#include <linux/sysctl.h>
#include <linux/audit.h>
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#include <linux/string.h>
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#include <linux/selinux.h>
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#include <linux/mutex.h>
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#include "avc.h"
#include "objsec.h"
#include "netif.h"
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#include "xfrm.h"
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#include "netlabel.h"
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#define XATTR_SELINUX_SUFFIX "selinux"
#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX

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#define NUM_SEL_MNT_OPTS 4

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extern unsigned int policydb_loaded_version;
extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
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extern int selinux_compat_net;
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extern struct security_operations *security_ops;
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
int selinux_enforcing = 0;

static int __init enforcing_setup(char *str)
{
	selinux_enforcing = simple_strtol(str,NULL,0);
	return 1;
}
__setup("enforcing=", enforcing_setup);
#endif

#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;

static int __init selinux_enabled_setup(char *str)
{
	selinux_enabled = simple_strtol(str, NULL, 0);
	return 1;
}
__setup("selinux=", selinux_enabled_setup);
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#else
int selinux_enabled = 1;
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#endif

/* Original (dummy) security module. */
static struct security_operations *original_ops = NULL;

/* Minimal support for a secondary security module,
   just to allow the use of the dummy or capability modules.
   The owlsm module can alternatively be used as a secondary
   module as long as CONFIG_OWLSM_FD is not enabled. */
static struct security_operations *secondary_ops = NULL;

/* Lists of inode and superblock security structures initialized
   before the policy was loaded. */
static LIST_HEAD(superblock_security_head);
static DEFINE_SPINLOCK(sb_security_lock);

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static struct kmem_cache *sel_inode_cache;
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/* Return security context for a given sid or just the context 
   length if the buffer is null or length is 0 */
static int selinux_getsecurity(u32 sid, void *buffer, size_t size)
{
	char *context;
	unsigned len;
	int rc;

	rc = security_sid_to_context(sid, &context, &len);
	if (rc)
		return rc;

	if (!buffer || !size)
		goto getsecurity_exit;

	if (size < len) {
		len = -ERANGE;
		goto getsecurity_exit;
	}
	memcpy(buffer, context, len);

getsecurity_exit:
	kfree(context);
	return len;
}

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/* Allocate and free functions for each kind of security blob. */

static int task_alloc_security(struct task_struct *task)
{
	struct task_security_struct *tsec;

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	tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
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	if (!tsec)
		return -ENOMEM;

	tsec->task = task;
	tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
	task->security = tsec;

	return 0;
}

static void task_free_security(struct task_struct *task)
{
	struct task_security_struct *tsec = task->security;
	task->security = NULL;
	kfree(tsec);
}

static int inode_alloc_security(struct inode *inode)
{
	struct task_security_struct *tsec = current->security;
	struct inode_security_struct *isec;

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	isec = kmem_cache_zalloc(sel_inode_cache, GFP_KERNEL);
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	if (!isec)
		return -ENOMEM;

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	mutex_init(&isec->lock);
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	INIT_LIST_HEAD(&isec->list);
	isec->inode = inode;
	isec->sid = SECINITSID_UNLABELED;
	isec->sclass = SECCLASS_FILE;
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	isec->task_sid = tsec->sid;
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	inode->i_security = isec;

	return 0;
}

static void inode_free_security(struct inode *inode)
{
	struct inode_security_struct *isec = inode->i_security;
	struct superblock_security_struct *sbsec = inode->i_sb->s_security;

	spin_lock(&sbsec->isec_lock);
	if (!list_empty(&isec->list))
		list_del_init(&isec->list);
	spin_unlock(&sbsec->isec_lock);

	inode->i_security = NULL;
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	kmem_cache_free(sel_inode_cache, isec);
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}

static int file_alloc_security(struct file *file)
{
	struct task_security_struct *tsec = current->security;
	struct file_security_struct *fsec;

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	fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
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	if (!fsec)
		return -ENOMEM;

	fsec->file = file;
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	fsec->sid = tsec->sid;
	fsec->fown_sid = tsec->sid;
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	file->f_security = fsec;

	return 0;
}

static void file_free_security(struct file *file)
{
	struct file_security_struct *fsec = file->f_security;
	file->f_security = NULL;
	kfree(fsec);
}

static int superblock_alloc_security(struct super_block *sb)
{
	struct superblock_security_struct *sbsec;

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	sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
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	if (!sbsec)
		return -ENOMEM;

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	mutex_init(&sbsec->lock);
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	INIT_LIST_HEAD(&sbsec->list);
	INIT_LIST_HEAD(&sbsec->isec_head);
	spin_lock_init(&sbsec->isec_lock);
	sbsec->sb = sb;
	sbsec->sid = SECINITSID_UNLABELED;
	sbsec->def_sid = SECINITSID_FILE;
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	sbsec->mntpoint_sid = SECINITSID_UNLABELED;
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	sb->s_security = sbsec;

	return 0;
}

static void superblock_free_security(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = sb->s_security;

	spin_lock(&sb_security_lock);
	if (!list_empty(&sbsec->list))
		list_del_init(&sbsec->list);
	spin_unlock(&sb_security_lock);

	sb->s_security = NULL;
	kfree(sbsec);
}

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static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
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{
	struct sk_security_struct *ssec;

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	ssec = kzalloc(sizeof(*ssec), priority);
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	if (!ssec)
		return -ENOMEM;

	ssec->sk = sk;
	ssec->peer_sid = SECINITSID_UNLABELED;
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	ssec->sid = SECINITSID_UNLABELED;
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	sk->sk_security = ssec;

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	selinux_netlbl_sk_security_init(ssec, family);

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	return 0;
}

static void sk_free_security(struct sock *sk)
{
	struct sk_security_struct *ssec = sk->sk_security;

	sk->sk_security = NULL;
	kfree(ssec);
}

/* The security server must be initialized before
   any labeling or access decisions can be provided. */
extern int ss_initialized;

/* The file system's label must be initialized prior to use. */

static char *labeling_behaviors[6] = {
	"uses xattr",
	"uses transition SIDs",
	"uses task SIDs",
	"uses genfs_contexts",
	"not configured for labeling",
	"uses mountpoint labeling",
};

static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);

static inline int inode_doinit(struct inode *inode)
{
	return inode_doinit_with_dentry(inode, NULL);
}

enum {
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	Opt_error = -1,
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	Opt_context = 1,
	Opt_fscontext = 2,
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	Opt_defcontext = 3,
	Opt_rootcontext = 4,
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};

static match_table_t tokens = {
	{Opt_context, "context=%s"},
	{Opt_fscontext, "fscontext=%s"},
	{Opt_defcontext, "defcontext=%s"},
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	{Opt_rootcontext, "rootcontext=%s"},
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	{Opt_error, NULL},
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};

#define SEL_MOUNT_FAIL_MSG "SELinux:  duplicate or incompatible mount options\n"

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static int may_context_mount_sb_relabel(u32 sid,
			struct superblock_security_struct *sbsec,
			struct task_security_struct *tsec)
{
	int rc;

	rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
			  FILESYSTEM__RELABELFROM, NULL);
	if (rc)
		return rc;

	rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
			  FILESYSTEM__RELABELTO, NULL);
	return rc;
}

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static int may_context_mount_inode_relabel(u32 sid,
			struct superblock_security_struct *sbsec,
			struct task_security_struct *tsec)
{
	int rc;
	rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
			  FILESYSTEM__RELABELFROM, NULL);
	if (rc)
		return rc;

	rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
			  FILESYSTEM__ASSOCIATE, NULL);
	return rc;
}

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static int sb_finish_set_opts(struct super_block *sb)
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{
	struct superblock_security_struct *sbsec = sb->s_security;
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	struct dentry *root = sb->s_root;
	struct inode *root_inode = root->d_inode;
	int rc = 0;
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	if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
		/* Make sure that the xattr handler exists and that no
		   error other than -ENODATA is returned by getxattr on
		   the root directory.  -ENODATA is ok, as this may be
		   the first boot of the SELinux kernel before we have
		   assigned xattr values to the filesystem. */
		if (!root_inode->i_op->getxattr) {
			printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
			       "xattr support\n", sb->s_id, sb->s_type->name);
			rc = -EOPNOTSUPP;
			goto out;
		}
		rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
		if (rc < 0 && rc != -ENODATA) {
			if (rc == -EOPNOTSUPP)
				printk(KERN_WARNING "SELinux: (dev %s, type "
				       "%s) has no security xattr handler\n",
				       sb->s_id, sb->s_type->name);
			else
				printk(KERN_WARNING "SELinux: (dev %s, type "
				       "%s) getxattr errno %d\n", sb->s_id,
				       sb->s_type->name, -rc);
			goto out;
		}
	}
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	sbsec->initialized = 1;
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	if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
		printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
		       sb->s_id, sb->s_type->name);
	else
		printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
		       sb->s_id, sb->s_type->name,
		       labeling_behaviors[sbsec->behavior-1]);
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	/* Initialize the root inode. */
	rc = inode_doinit_with_dentry(root_inode, root);
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	/* Initialize any other inodes associated with the superblock, e.g.
	   inodes created prior to initial policy load or inodes created
	   during get_sb by a pseudo filesystem that directly
	   populates itself. */
	spin_lock(&sbsec->isec_lock);
next_inode:
	if (!list_empty(&sbsec->isec_head)) {
		struct inode_security_struct *isec =
				list_entry(sbsec->isec_head.next,
					   struct inode_security_struct, list);
		struct inode *inode = isec->inode;
		spin_unlock(&sbsec->isec_lock);
		inode = igrab(inode);
		if (inode) {
			if (!IS_PRIVATE(inode))
				inode_doinit(inode);
			iput(inode);
		}
		spin_lock(&sbsec->isec_lock);
		list_del_init(&isec->list);
		goto next_inode;
	}
	spin_unlock(&sbsec->isec_lock);
out:
	return rc;
}
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/*
 * This function should allow an FS to ask what it's mount security
 * options were so it can use those later for submounts, displaying
 * mount options, or whatever.
 */
static int selinux_get_mnt_opts(const struct super_block *sb,
				char ***mount_options, int **mnt_opts_flags,
				int *num_opts)
{
	int rc = 0, i;
	struct superblock_security_struct *sbsec = sb->s_security;
	char *context = NULL;
	u32 len;
	char tmp;
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	*num_opts = 0;
	*mount_options = NULL;
	*mnt_opts_flags = NULL;
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	if (!sbsec->initialized)
		return -EINVAL;
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	if (!ss_initialized)
		return -EINVAL;
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	/*
	 * if we ever use sbsec flags for anything other than tracking mount
	 * settings this is going to need a mask
	 */
	tmp = sbsec->flags;
	/* count the number of mount options for this sb */
	for (i = 0; i < 8; i++) {
		if (tmp & 0x01)
			(*num_opts)++;
		tmp >>= 1;
	}
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	*mount_options = kcalloc(*num_opts, sizeof(char *), GFP_ATOMIC);
	if (!*mount_options) {
		rc = -ENOMEM;
		goto out_free;
	}
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	*mnt_opts_flags = kcalloc(*num_opts, sizeof(int), GFP_ATOMIC);
	if (!*mnt_opts_flags) {
		rc = -ENOMEM;
		goto out_free;
	}
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	i = 0;
	if (sbsec->flags & FSCONTEXT_MNT) {
		rc = security_sid_to_context(sbsec->sid, &context, &len);
		if (rc)
			goto out_free;
		(*mount_options)[i] = context;
		(*mnt_opts_flags)[i++] = FSCONTEXT_MNT;
	}
	if (sbsec->flags & CONTEXT_MNT) {
		rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
		if (rc)
			goto out_free;
		(*mount_options)[i] = context;
		(*mnt_opts_flags)[i++] = CONTEXT_MNT;
	}
	if (sbsec->flags & DEFCONTEXT_MNT) {
		rc = security_sid_to_context(sbsec->def_sid, &context, &len);
		if (rc)
			goto out_free;
		(*mount_options)[i] = context;
		(*mnt_opts_flags)[i++] = DEFCONTEXT_MNT;
	}
	if (sbsec->flags & ROOTCONTEXT_MNT) {
		struct inode *root = sbsec->sb->s_root->d_inode;
		struct inode_security_struct *isec = root->i_security;
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		rc = security_sid_to_context(isec->sid, &context, &len);
		if (rc)
			goto out_free;
		(*mount_options)[i] = context;
		(*mnt_opts_flags)[i++] = ROOTCONTEXT_MNT;
	}
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	BUG_ON(i != *num_opts);
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	return 0;

out_free:
	/* don't leak context string if security_sid_to_context had an error */
	if (*mount_options && i)
		for (; i > 0; i--)
			kfree((*mount_options)[i-1]);
	kfree(*mount_options);
	*mount_options = NULL;
	kfree(*mnt_opts_flags);
	*mnt_opts_flags = NULL;
	*num_opts = 0;
	return rc;
}
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static int bad_option(struct superblock_security_struct *sbsec, char flag,
		      u32 old_sid, u32 new_sid)
{
	/* check if the old mount command had the same options */
	if (sbsec->initialized)
		if (!(sbsec->flags & flag) ||
		    (old_sid != new_sid))
			return 1;

	/* check if we were passed the same options twice,
	 * aka someone passed context=a,context=b
	 */
	if (!sbsec->initialized)
		if (sbsec->flags & flag)
			return 1;
	return 0;
}
/*
 * Allow filesystems with binary mount data to explicitly set mount point
 * labeling information.
 */
int selinux_set_mnt_opts(struct super_block *sb, char **mount_options,
				 int *flags, int num_opts)
{
	int rc = 0, i;
	struct task_security_struct *tsec = current->security;
	struct superblock_security_struct *sbsec = sb->s_security;
	const char *name = sb->s_type->name;
	struct inode *inode = sbsec->sb->s_root->d_inode;
	struct inode_security_struct *root_isec = inode->i_security;
	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
	u32 defcontext_sid = 0;

	mutex_lock(&sbsec->lock);

	if (!ss_initialized) {
		if (!num_opts) {
			/* Defer initialization until selinux_complete_init,
			   after the initial policy is loaded and the security
			   server is ready to handle calls. */
			spin_lock(&sb_security_lock);
			if (list_empty(&sbsec->list))
				list_add(&sbsec->list, &superblock_security_head);
			spin_unlock(&sb_security_lock);
			goto out;
		}
		rc = -EINVAL;
		printk(KERN_WARNING "Unable to set superblock options before "
		       "the security server is initialized\n");
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		goto out;
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	}
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	/*
	 * parse the mount options, check if they are valid sids.
	 * also check if someone is trying to mount the same sb more
	 * than once with different security options.
	 */
	for (i = 0; i < num_opts; i++) {
		u32 sid;
		rc = security_context_to_sid(mount_options[i],
					     strlen(mount_options[i]), &sid);
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		if (rc) {
			printk(KERN_WARNING "SELinux: security_context_to_sid"
			       "(%s) failed for (dev %s, type %s) errno=%d\n",
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
			       mount_options[i], sb->s_id, name, rc);
			goto out;
		}
		switch (flags[i]) {
		case FSCONTEXT_MNT:
			fscontext_sid = sid;

			if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
					fscontext_sid))
				goto out_double_mount;

			sbsec->flags |= FSCONTEXT_MNT;
			break;
		case CONTEXT_MNT:
			context_sid = sid;

			if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
					context_sid))
				goto out_double_mount;

			sbsec->flags |= CONTEXT_MNT;
			break;
		case ROOTCONTEXT_MNT:
			rootcontext_sid = sid;

			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
					rootcontext_sid))
				goto out_double_mount;

			sbsec->flags |= ROOTCONTEXT_MNT;

			break;
		case DEFCONTEXT_MNT:
			defcontext_sid = sid;

			if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
					defcontext_sid))
				goto out_double_mount;

			sbsec->flags |= DEFCONTEXT_MNT;

			break;
		default:
			rc = -EINVAL;
			goto out;
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652
		}
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672
	}

	if (sbsec->initialized) {
		/* previously mounted with options, but not on this attempt? */
		if (sbsec->flags && !num_opts)
			goto out_double_mount;
		rc = 0;
		goto out;
	}

	if (strcmp(sb->s_type->name, "proc") == 0)
		sbsec->proc = 1;

	/* Determine the labeling behavior to use for this filesystem type. */
	rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
	if (rc) {
		printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
		       __FUNCTION__, sb->s_type->name, rc);
		goto out;
	}
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674 675 676 677
	/* sets the context of the superblock for the fs being mounted. */
	if (fscontext_sid) {

		rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec);
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		if (rc)
679
			goto out;
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681
		sbsec->sid = fscontext_sid;
682 683 684 685 686 687 688
	}

	/*
	 * Switch to using mount point labeling behavior.
	 * sets the label used on all file below the mountpoint, and will set
	 * the superblock context if not already set.
	 */
689 690 691
	if (context_sid) {
		if (!fscontext_sid) {
			rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec);
692
			if (rc)
693 694
				goto out;
			sbsec->sid = context_sid;
695
		} else {
696
			rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec);
697
			if (rc)
698
				goto out;
699
		}
700 701
		if (!rootcontext_sid)
			rootcontext_sid = context_sid;
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702

703
		sbsec->mntpoint_sid = context_sid;
704
		sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
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	}

707 708
	if (rootcontext_sid) {
		rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec);
709
		if (rc)
710
			goto out;
711

712 713
		root_isec->sid = rootcontext_sid;
		root_isec->initialized = 1;
714 715
	}

716 717 718 719 720 721
	if (defcontext_sid) {
		if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
			rc = -EINVAL;
			printk(KERN_WARNING "SELinux: defcontext option is "
			       "invalid for this filesystem type\n");
			goto out;
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		}

724 725 726 727 728 729
		if (defcontext_sid != sbsec->def_sid) {
			rc = may_context_mount_inode_relabel(defcontext_sid,
							     sbsec, tsec);
			if (rc)
				goto out;
		}
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731
		sbsec->def_sid = defcontext_sid;
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	}

734
	rc = sb_finish_set_opts(sb);
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out:
736
	mutex_unlock(&sbsec->lock);
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	return rc;
738 739 740 741 742
out_double_mount:
	rc = -EINVAL;
	printk(KERN_WARNING "SELinux: mount invalid.  Same superblock, different "
	       "security settings for (dev %s, type %s)\n", sb->s_id, name);
	goto out;
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}

745 746
static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
					struct super_block *newsb)
L
Linus Torvalds 已提交
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{
748 749
	const struct superblock_security_struct *oldsbsec = oldsb->s_security;
	struct superblock_security_struct *newsbsec = newsb->s_security;
L
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751 752 753
	int set_fscontext =	(oldsbsec->flags & FSCONTEXT_MNT);
	int set_context =	(oldsbsec->flags & CONTEXT_MNT);
	int set_rootcontext =	(oldsbsec->flags & ROOTCONTEXT_MNT);
L
Linus Torvalds 已提交
754

755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
	/* we can't error, we can't save the info, this shouldn't get called
	 * this early in the boot process. */
	BUG_ON(!ss_initialized);

	/* this might go away sometime down the line if there is a new user
	 * of clone, but for now, nfs better not get here... */
	BUG_ON(newsbsec->initialized);

	/* how can we clone if the old one wasn't set up?? */
	BUG_ON(!oldsbsec->initialized);

	mutex_lock(&newsbsec->lock);

	newsbsec->flags = oldsbsec->flags;

	newsbsec->sid = oldsbsec->sid;
	newsbsec->def_sid = oldsbsec->def_sid;
	newsbsec->behavior = oldsbsec->behavior;

	if (set_context) {
		u32 sid = oldsbsec->mntpoint_sid;

		if (!set_fscontext)
			newsbsec->sid = sid;
		if (!set_rootcontext) {
			struct inode *newinode = newsb->s_root->d_inode;
			struct inode_security_struct *newisec = newinode->i_security;
			newisec->sid = sid;
		}
		newsbsec->mntpoint_sid = sid;
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	}
786 787 788 789 790
	if (set_rootcontext) {
		const struct inode *oldinode = oldsb->s_root->d_inode;
		const struct inode_security_struct *oldisec = oldinode->i_security;
		struct inode *newinode = newsb->s_root->d_inode;
		struct inode_security_struct *newisec = newinode->i_security;
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792
		newisec->sid = oldisec->sid;
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	}

795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
	sb_finish_set_opts(newsb);
	mutex_unlock(&newsbsec->lock);
}

/*
 * string mount options parsing and call set the sbsec
 */
static int superblock_doinit(struct super_block *sb, void *data)
{
	char *context = NULL, *defcontext = NULL;
	char *fscontext = NULL, *rootcontext = NULL;
	int rc = 0;
	char *p, *options = data;
	/* selinux only know about a fixed number of mount options */
	char *mnt_opts[NUM_SEL_MNT_OPTS];
	int mnt_opts_flags[NUM_SEL_MNT_OPTS], num_mnt_opts = 0;

	if (!data)
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		goto out;

815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
	/* with the nfs patch this will become a goto out; */
	if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
		const char *name = sb->s_type->name;
		/* NFS we understand. */
		if (!strcmp(name, "nfs")) {
			struct nfs_mount_data *d = data;

			if (d->version !=  NFS_MOUNT_VERSION)
				goto out;

			if (d->context[0]) {
				context = kstrdup(d->context, GFP_KERNEL);
				if (!context) {
					rc = -ENOMEM;
					goto out;
				}
			}
			goto build_flags;
		} else
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			goto out;
	}

837 838 839 840
	/* Standard string-based options. */
	while ((p = strsep(&options, "|")) != NULL) {
		int token;
		substring_t args[MAX_OPT_ARGS];
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842 843
		if (!*p)
			continue;
L
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844

845
		token = match_token(p, tokens, args);
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847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
		switch (token) {
		case Opt_context:
			if (context || defcontext) {
				rc = -EINVAL;
				printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
				goto out_err;
			}
			context = match_strdup(&args[0]);
			if (!context) {
				rc = -ENOMEM;
				goto out_err;
			}
			break;

		case Opt_fscontext:
			if (fscontext) {
				rc = -EINVAL;
				printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
				goto out_err;
			}
			fscontext = match_strdup(&args[0]);
			if (!fscontext) {
				rc = -ENOMEM;
				goto out_err;
			}
			break;

		case Opt_rootcontext:
			if (rootcontext) {
				rc = -EINVAL;
				printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
				goto out_err;
			}
			rootcontext = match_strdup(&args[0]);
			if (!rootcontext) {
				rc = -ENOMEM;
				goto out_err;
			}
			break;

		case Opt_defcontext:
			if (context || defcontext) {
				rc = -EINVAL;
				printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
				goto out_err;
			}
			defcontext = match_strdup(&args[0]);
			if (!defcontext) {
				rc = -ENOMEM;
				goto out_err;
			}
			break;

		default:
			rc = -EINVAL;
			printk(KERN_WARNING "SELinux:  unknown mount option\n");
			goto out_err;
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904 905 906

		}
	}
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925

build_flags:
	if (fscontext) {
		mnt_opts[num_mnt_opts] = fscontext;
		mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
	}
	if (context) {
		mnt_opts[num_mnt_opts] = context;
		mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
	}
	if (rootcontext) {
		mnt_opts[num_mnt_opts] = rootcontext;
		mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
	}
	if (defcontext) {
		mnt_opts[num_mnt_opts] = defcontext;
		mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
	}

L
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out:
927 928 929 930 931 932
	rc = selinux_set_mnt_opts(sb, mnt_opts, mnt_opts_flags, num_mnt_opts);
out_err:
	kfree(context);
	kfree(defcontext);
	kfree(fscontext);
	kfree(rootcontext);
L
Linus Torvalds 已提交
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958
	return rc;
}

static inline u16 inode_mode_to_security_class(umode_t mode)
{
	switch (mode & S_IFMT) {
	case S_IFSOCK:
		return SECCLASS_SOCK_FILE;
	case S_IFLNK:
		return SECCLASS_LNK_FILE;
	case S_IFREG:
		return SECCLASS_FILE;
	case S_IFBLK:
		return SECCLASS_BLK_FILE;
	case S_IFDIR:
		return SECCLASS_DIR;
	case S_IFCHR:
		return SECCLASS_CHR_FILE;
	case S_IFIFO:
		return SECCLASS_FIFO_FILE;

	}

	return SECCLASS_FILE;
}

959 960 961 962 963 964 965 966 967 968
static inline int default_protocol_stream(int protocol)
{
	return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
}

static inline int default_protocol_dgram(int protocol)
{
	return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
}

L
Linus Torvalds 已提交
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
static inline u16 socket_type_to_security_class(int family, int type, int protocol)
{
	switch (family) {
	case PF_UNIX:
		switch (type) {
		case SOCK_STREAM:
		case SOCK_SEQPACKET:
			return SECCLASS_UNIX_STREAM_SOCKET;
		case SOCK_DGRAM:
			return SECCLASS_UNIX_DGRAM_SOCKET;
		}
		break;
	case PF_INET:
	case PF_INET6:
		switch (type) {
		case SOCK_STREAM:
985 986 987 988
			if (default_protocol_stream(protocol))
				return SECCLASS_TCP_SOCKET;
			else
				return SECCLASS_RAWIP_SOCKET;
L
Linus Torvalds 已提交
989
		case SOCK_DGRAM:
990 991 992 993
			if (default_protocol_dgram(protocol))
				return SECCLASS_UDP_SOCKET;
			else
				return SECCLASS_RAWIP_SOCKET;
J
James Morris 已提交
994 995
		case SOCK_DCCP:
			return SECCLASS_DCCP_SOCKET;
996
		default:
L
Linus Torvalds 已提交
997 998 999 1000 1001 1002 1003 1004 1005
			return SECCLASS_RAWIP_SOCKET;
		}
		break;
	case PF_NETLINK:
		switch (protocol) {
		case NETLINK_ROUTE:
			return SECCLASS_NETLINK_ROUTE_SOCKET;
		case NETLINK_FIREWALL:
			return SECCLASS_NETLINK_FIREWALL_SOCKET;
1006
		case NETLINK_INET_DIAG:
L
Linus Torvalds 已提交
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
			return SECCLASS_NETLINK_TCPDIAG_SOCKET;
		case NETLINK_NFLOG:
			return SECCLASS_NETLINK_NFLOG_SOCKET;
		case NETLINK_XFRM:
			return SECCLASS_NETLINK_XFRM_SOCKET;
		case NETLINK_SELINUX:
			return SECCLASS_NETLINK_SELINUX_SOCKET;
		case NETLINK_AUDIT:
			return SECCLASS_NETLINK_AUDIT_SOCKET;
		case NETLINK_IP6_FW:
			return SECCLASS_NETLINK_IP6FW_SOCKET;
		case NETLINK_DNRTMSG:
			return SECCLASS_NETLINK_DNRT_SOCKET;
1020 1021
		case NETLINK_KOBJECT_UEVENT:
			return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
L
Linus Torvalds 已提交
1022 1023 1024 1025 1026 1027 1028
		default:
			return SECCLASS_NETLINK_SOCKET;
		}
	case PF_PACKET:
		return SECCLASS_PACKET_SOCKET;
	case PF_KEY:
		return SECCLASS_KEY_SOCKET;
1029 1030
	case PF_APPLETALK:
		return SECCLASS_APPLETALK_SOCKET;
L
Linus Torvalds 已提交
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
	}

	return SECCLASS_SOCKET;
}

#ifdef CONFIG_PROC_FS
static int selinux_proc_get_sid(struct proc_dir_entry *de,
				u16 tclass,
				u32 *sid)
{
	int buflen, rc;
	char *buffer, *path, *end;

	buffer = (char*)__get_free_page(GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buflen = PAGE_SIZE;
	end = buffer+buflen;
	*--end = '\0';
	buflen--;
	path = end-1;
	*path = '/';
	while (de && de != de->parent) {
		buflen -= de->namelen + 1;
		if (buflen < 0)
			break;
		end -= de->namelen;
		memcpy(end, de->name, de->namelen);
		*--end = '/';
		path = end;
		de = de->parent;
	}
	rc = security_genfs_sid("proc", path, tclass, sid);
	free_page((unsigned long)buffer);
	return rc;
}
#else
static int selinux_proc_get_sid(struct proc_dir_entry *de,
				u16 tclass,
				u32 *sid)
{
	return -EINVAL;
}
#endif

/* The inode's security attributes must be initialized before first use. */
static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
{
	struct superblock_security_struct *sbsec = NULL;
	struct inode_security_struct *isec = inode->i_security;
	u32 sid;
	struct dentry *dentry;
#define INITCONTEXTLEN 255
	char *context = NULL;
	unsigned len = 0;
	int rc = 0;

	if (isec->initialized)
		goto out;

1092
	mutex_lock(&isec->lock);
L
Linus Torvalds 已提交
1093
	if (isec->initialized)
1094
		goto out_unlock;
L
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1095 1096 1097 1098 1099 1100 1101 1102 1103 1104

	sbsec = inode->i_sb->s_security;
	if (!sbsec->initialized) {
		/* Defer initialization until selinux_complete_init,
		   after the initial policy is loaded and the security
		   server is ready to handle calls. */
		spin_lock(&sbsec->isec_lock);
		if (list_empty(&isec->list))
			list_add(&isec->list, &sbsec->isec_head);
		spin_unlock(&sbsec->isec_lock);
1105
		goto out_unlock;
L
Linus Torvalds 已提交
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
	}

	switch (sbsec->behavior) {
	case SECURITY_FS_USE_XATTR:
		if (!inode->i_op->getxattr) {
			isec->sid = sbsec->def_sid;
			break;
		}

		/* Need a dentry, since the xattr API requires one.
		   Life would be simpler if we could just pass the inode. */
		if (opt_dentry) {
			/* Called from d_instantiate or d_splice_alias. */
			dentry = dget(opt_dentry);
		} else {
			/* Called from selinux_complete_init, try to find a dentry. */
			dentry = d_find_alias(inode);
		}
		if (!dentry) {
			printk(KERN_WARNING "%s:  no dentry for dev=%s "
			       "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
			       inode->i_ino);
1128
			goto out_unlock;
L
Linus Torvalds 已提交
1129 1130 1131 1132 1133 1134 1135
		}

		len = INITCONTEXTLEN;
		context = kmalloc(len, GFP_KERNEL);
		if (!context) {
			rc = -ENOMEM;
			dput(dentry);
1136
			goto out_unlock;
L
Linus Torvalds 已提交
1137 1138 1139 1140 1141 1142 1143 1144 1145
		}
		rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
					   context, len);
		if (rc == -ERANGE) {
			/* Need a larger buffer.  Query for the right size. */
			rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
						   NULL, 0);
			if (rc < 0) {
				dput(dentry);
1146
				goto out_unlock;
L
Linus Torvalds 已提交
1147 1148 1149 1150 1151 1152 1153
			}
			kfree(context);
			len = rc;
			context = kmalloc(len, GFP_KERNEL);
			if (!context) {
				rc = -ENOMEM;
				dput(dentry);
1154
				goto out_unlock;
L
Linus Torvalds 已提交
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
			}
			rc = inode->i_op->getxattr(dentry,
						   XATTR_NAME_SELINUX,
						   context, len);
		}
		dput(dentry);
		if (rc < 0) {
			if (rc != -ENODATA) {
				printk(KERN_WARNING "%s:  getxattr returned "
				       "%d for dev=%s ino=%ld\n", __FUNCTION__,
				       -rc, inode->i_sb->s_id, inode->i_ino);
				kfree(context);
1167
				goto out_unlock;
L
Linus Torvalds 已提交
1168 1169 1170 1171 1172
			}
			/* Map ENODATA to the default file SID */
			sid = sbsec->def_sid;
			rc = 0;
		} else {
1173 1174
			rc = security_context_to_sid_default(context, rc, &sid,
			                                     sbsec->def_sid);
L
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1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
			if (rc) {
				printk(KERN_WARNING "%s:  context_to_sid(%s) "
				       "returned %d for dev=%s ino=%ld\n",
				       __FUNCTION__, context, -rc,
				       inode->i_sb->s_id, inode->i_ino);
				kfree(context);
				/* Leave with the unlabeled SID */
				rc = 0;
				break;
			}
		}
		kfree(context);
		isec->sid = sid;
		break;
	case SECURITY_FS_USE_TASK:
		isec->sid = isec->task_sid;
		break;
	case SECURITY_FS_USE_TRANS:
		/* Default to the fs SID. */
		isec->sid = sbsec->sid;

		/* Try to obtain a transition SID. */
		isec->sclass = inode_mode_to_security_class(inode->i_mode);
		rc = security_transition_sid(isec->task_sid,
					     sbsec->sid,
					     isec->sclass,
					     &sid);
		if (rc)
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			goto out_unlock;
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		isec->sid = sid;
		break;
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	case SECURITY_FS_USE_MNTPOINT:
		isec->sid = sbsec->mntpoint_sid;
		break;
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	default:
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		/* Default to the fs superblock SID. */
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		isec->sid = sbsec->sid;

		if (sbsec->proc) {
			struct proc_inode *proci = PROC_I(inode);
			if (proci->pde) {
				isec->sclass = inode_mode_to_security_class(inode->i_mode);
				rc = selinux_proc_get_sid(proci->pde,
							  isec->sclass,
							  &sid);
				if (rc)
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					goto out_unlock;
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				isec->sid = sid;
			}
		}
		break;
	}

	isec->initialized = 1;

1230 1231
out_unlock:
	mutex_unlock(&isec->lock);
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out:
	if (isec->sclass == SECCLASS_FILE)
		isec->sclass = inode_mode_to_security_class(inode->i_mode);
	return rc;
}

/* Convert a Linux signal to an access vector. */
static inline u32 signal_to_av(int sig)
{
	u32 perm = 0;

	switch (sig) {
	case SIGCHLD:
		/* Commonly granted from child to parent. */
		perm = PROCESS__SIGCHLD;
		break;
	case SIGKILL:
		/* Cannot be caught or ignored */
		perm = PROCESS__SIGKILL;
		break;
	case SIGSTOP:
		/* Cannot be caught or ignored */
		perm = PROCESS__SIGSTOP;
		break;
	default:
		/* All other signals. */
		perm = PROCESS__SIGNAL;
		break;
	}

	return perm;
}

/* Check permission betweeen a pair of tasks, e.g. signal checks,
   fork check, ptrace check, etc. */
static int task_has_perm(struct task_struct *tsk1,
			 struct task_struct *tsk2,
			 u32 perms)
{
	struct task_security_struct *tsec1, *tsec2;

	tsec1 = tsk1->security;
	tsec2 = tsk2->security;
	return avc_has_perm(tsec1->sid, tsec2->sid,
			    SECCLASS_PROCESS, perms, NULL);
}

/* Check whether a task is allowed to use a capability. */
static int task_has_capability(struct task_struct *tsk,
			       int cap)
{
	struct task_security_struct *tsec;
	struct avc_audit_data ad;

	tsec = tsk->security;

	AVC_AUDIT_DATA_INIT(&ad,CAP);
	ad.tsk = tsk;
	ad.u.cap = cap;

	return avc_has_perm(tsec->sid, tsec->sid,
			    SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad);
}

/* Check whether a task is allowed to use a system operation. */
static int task_has_system(struct task_struct *tsk,
			   u32 perms)
{
	struct task_security_struct *tsec;

	tsec = tsk->security;

	return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
			    SECCLASS_SYSTEM, perms, NULL);
}

/* Check whether a task has a particular permission to an inode.
   The 'adp' parameter is optional and allows other audit
   data to be passed (e.g. the dentry). */
static int inode_has_perm(struct task_struct *tsk,
			  struct inode *inode,
			  u32 perms,
			  struct avc_audit_data *adp)
{
	struct task_security_struct *tsec;
	struct inode_security_struct *isec;
	struct avc_audit_data ad;

1320 1321 1322
	if (unlikely (IS_PRIVATE (inode)))
		return 0;

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	tsec = tsk->security;
	isec = inode->i_security;

	if (!adp) {
		adp = &ad;
		AVC_AUDIT_DATA_INIT(&ad, FS);
		ad.u.fs.inode = inode;
	}

	return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
}

/* Same as inode_has_perm, but pass explicit audit data containing
   the dentry to help the auditing code to more easily generate the
   pathname if needed. */
static inline int dentry_has_perm(struct task_struct *tsk,
				  struct vfsmount *mnt,
				  struct dentry *dentry,
				  u32 av)
{
	struct inode *inode = dentry->d_inode;
	struct avc_audit_data ad;
	AVC_AUDIT_DATA_INIT(&ad,FS);
	ad.u.fs.mnt = mnt;
	ad.u.fs.dentry = dentry;
	return inode_has_perm(tsk, inode, av, &ad);
}

/* Check whether a task can use an open file descriptor to
   access an inode in a given way.  Check access to the
   descriptor itself, and then use dentry_has_perm to
   check a particular permission to the file.
   Access to the descriptor is implicitly granted if it
   has the same SID as the process.  If av is zero, then
   access to the file is not checked, e.g. for cases
   where only the descriptor is affected like seek. */
1359
static int file_has_perm(struct task_struct *tsk,
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				struct file *file,
				u32 av)
{
	struct task_security_struct *tsec = tsk->security;
	struct file_security_struct *fsec = file->f_security;
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	struct vfsmount *mnt = file->f_path.mnt;
	struct dentry *dentry = file->f_path.dentry;
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	struct inode *inode = dentry->d_inode;
	struct avc_audit_data ad;
	int rc;

	AVC_AUDIT_DATA_INIT(&ad, FS);
	ad.u.fs.mnt = mnt;
	ad.u.fs.dentry = dentry;

	if (tsec->sid != fsec->sid) {
		rc = avc_has_perm(tsec->sid, fsec->sid,
				  SECCLASS_FD,
				  FD__USE,
				  &ad);
		if (rc)
			return rc;
	}

	/* av is zero if only checking access to the descriptor. */
	if (av)
		return inode_has_perm(tsk, inode, av, &ad);

	return 0;
}

/* Check whether a task can create a file. */
static int may_create(struct inode *dir,
		      struct dentry *dentry,
		      u16 tclass)
{
	struct task_security_struct *tsec;
	struct inode_security_struct *dsec;
	struct superblock_security_struct *sbsec;
	u32 newsid;
	struct avc_audit_data ad;
	int rc;

	tsec = current->security;
	dsec = dir->i_security;
	sbsec = dir->i_sb->s_security;

	AVC_AUDIT_DATA_INIT(&ad, FS);
	ad.u.fs.dentry = dentry;

	rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
			  DIR__ADD_NAME | DIR__SEARCH,
			  &ad);
	if (rc)
		return rc;

	if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
		newsid = tsec->create_sid;
	} else {
		rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
					     &newsid);
		if (rc)
			return rc;
	}

	rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
	if (rc)
		return rc;

	return avc_has_perm(newsid, sbsec->sid,
			    SECCLASS_FILESYSTEM,
			    FILESYSTEM__ASSOCIATE, &ad);
}

1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
/* Check whether a task can create a key. */
static int may_create_key(u32 ksid,
			  struct task_struct *ctx)
{
	struct task_security_struct *tsec;

	tsec = ctx->security;

	return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
}

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#define MAY_LINK   0
#define MAY_UNLINK 1
#define MAY_RMDIR  2

/* Check whether a task can link, unlink, or rmdir a file/directory. */
static int may_link(struct inode *dir,
		    struct dentry *dentry,
		    int kind)

{
	struct task_security_struct *tsec;
	struct inode_security_struct *dsec, *isec;
	struct avc_audit_data ad;
	u32 av;
	int rc;

	tsec = current->security;
	dsec = dir->i_security;
	isec = dentry->d_inode->i_security;

	AVC_AUDIT_DATA_INIT(&ad, FS);
	ad.u.fs.dentry = dentry;

	av = DIR__SEARCH;
	av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
	rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
	if (rc)
		return rc;

	switch (kind) {
	case MAY_LINK:
		av = FILE__LINK;
		break;
	case MAY_UNLINK:
		av = FILE__UNLINK;
		break;
	case MAY_RMDIR:
		av = DIR__RMDIR;
		break;
	default:
		printk(KERN_WARNING "may_link:  unrecognized kind %d\n", kind);
		return 0;
	}

	rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
	return rc;
}

static inline int may_rename(struct inode *old_dir,
			     struct dentry *old_dentry,
			     struct inode *new_dir,
			     struct dentry *new_dentry)
{
	struct task_security_struct *tsec;
	struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
	struct avc_audit_data ad;
	u32 av;
	int old_is_dir, new_is_dir;
	int rc;

	tsec = current->security;
	old_dsec = old_dir->i_security;
	old_isec = old_dentry->d_inode->i_security;
	old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
	new_dsec = new_dir->i_security;

	AVC_AUDIT_DATA_INIT(&ad, FS);

	ad.u.fs.dentry = old_dentry;
	rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
			  DIR__REMOVE_NAME | DIR__SEARCH, &ad);
	if (rc)
		return rc;
	rc = avc_has_perm(tsec->sid, old_isec->sid,
			  old_isec->sclass, FILE__RENAME, &ad);
	if (rc)
		return rc;
	if (old_is_dir && new_dir != old_dir) {
		rc = avc_has_perm(tsec->sid, old_isec->sid,
				  old_isec->sclass, DIR__REPARENT, &ad);
		if (rc)
			return rc;
	}

	ad.u.fs.dentry = new_dentry;
	av = DIR__ADD_NAME | DIR__SEARCH;
	if (new_dentry->d_inode)
		av |= DIR__REMOVE_NAME;
	rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
	if (rc)
		return rc;
	if (new_dentry->d_inode) {
		new_isec = new_dentry->d_inode->i_security;
		new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
		rc = avc_has_perm(tsec->sid, new_isec->sid,
				  new_isec->sclass,
				  (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
		if (rc)
			return rc;
	}

	return 0;
}

/* Check whether a task can perform a filesystem operation. */
static int superblock_has_perm(struct task_struct *tsk,
			       struct super_block *sb,
			       u32 perms,
			       struct avc_audit_data *ad)
{
	struct task_security_struct *tsec;
	struct superblock_security_struct *sbsec;

	tsec = tsk->security;
	sbsec = sb->s_security;
	return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
			    perms, ad);
}

/* Convert a Linux mode and permission mask to an access vector. */
static inline u32 file_mask_to_av(int mode, int mask)
{
	u32 av = 0;

	if ((mode & S_IFMT) != S_IFDIR) {
		if (mask & MAY_EXEC)
			av |= FILE__EXECUTE;
		if (mask & MAY_READ)
			av |= FILE__READ;

		if (mask & MAY_APPEND)
			av |= FILE__APPEND;
		else if (mask & MAY_WRITE)
			av |= FILE__WRITE;

	} else {
		if (mask & MAY_EXEC)
			av |= DIR__SEARCH;
		if (mask & MAY_WRITE)
			av |= DIR__WRITE;
		if (mask & MAY_READ)
			av |= DIR__READ;
	}

	return av;
}

/* Convert a Linux file to an access vector. */
static inline u32 file_to_av(struct file *file)
{
	u32 av = 0;

	if (file->f_mode & FMODE_READ)
		av |= FILE__READ;
	if (file->f_mode & FMODE_WRITE) {
		if (file->f_flags & O_APPEND)
			av |= FILE__APPEND;
		else
			av |= FILE__WRITE;
	}

	return av;
}

/* Hook functions begin here. */

static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
{
	struct task_security_struct *psec = parent->security;
	struct task_security_struct *csec = child->security;
	int rc;

	rc = secondary_ops->ptrace(parent,child);
	if (rc)
		return rc;

	rc = task_has_perm(parent, child, PROCESS__PTRACE);
	/* Save the SID of the tracing process for later use in apply_creds. */
1623
	if (!(child->ptrace & PT_PTRACED) && !rc)
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		csec->ptrace_sid = psec->sid;
	return rc;
}

static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
                          kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	int error;

	error = task_has_perm(current, target, PROCESS__GETCAP);
	if (error)
		return error;

	return secondary_ops->capget(target, effective, inheritable, permitted);
}

static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
                                kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	int error;

	error = secondary_ops->capset_check(target, effective, inheritable, permitted);
	if (error)
		return error;

	return task_has_perm(current, target, PROCESS__SETCAP);
}

static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
                               kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	secondary_ops->capset_set(target, effective, inheritable, permitted);
}

static int selinux_capable(struct task_struct *tsk, int cap)
{
	int rc;

	rc = secondary_ops->capable(tsk, cap);
	if (rc)
		return rc;

	return task_has_capability(tsk,cap);
}

1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
{
	int buflen, rc;
	char *buffer, *path, *end;

	rc = -ENOMEM;
	buffer = (char*)__get_free_page(GFP_KERNEL);
	if (!buffer)
		goto out;

	buflen = PAGE_SIZE;
	end = buffer+buflen;
	*--end = '\0';
	buflen--;
	path = end-1;
	*path = '/';
	while (table) {
		const char *name = table->procname;
		size_t namelen = strlen(name);
		buflen -= namelen + 1;
		if (buflen < 0)
			goto out_free;
		end -= namelen;
		memcpy(end, name, namelen);
		*--end = '/';
		path = end;
		table = table->parent;
	}
1697 1698 1699 1700 1701 1702
	buflen -= 4;
	if (buflen < 0)
		goto out_free;
	end -= 4;
	memcpy(end, "/sys", 4);
	path = end;
1703 1704 1705 1706 1707 1708 1709
	rc = security_genfs_sid("proc", path, tclass, sid);
out_free:
	free_page((unsigned long)buffer);
out:
	return rc;
}

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static int selinux_sysctl(ctl_table *table, int op)
{
	int error = 0;
	u32 av;
	struct task_security_struct *tsec;
	u32 tsid;
	int rc;

	rc = secondary_ops->sysctl(table, op);
	if (rc)
		return rc;

	tsec = current->security;

1724 1725
	rc = selinux_sysctl_get_sid(table, (op == 0001) ?
				    SECCLASS_DIR : SECCLASS_FILE, &tsid);
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	if (rc) {
		/* Default to the well-defined sysctl SID. */
		tsid = SECINITSID_SYSCTL;
	}

	/* The op values are "defined" in sysctl.c, thereby creating
	 * a bad coupling between this module and sysctl.c */
	if(op == 001) {
		error = avc_has_perm(tsec->sid, tsid,
				     SECCLASS_DIR, DIR__SEARCH, NULL);
	} else {
		av = 0;
		if (op & 004)
			av |= FILE__READ;
		if (op & 002)
			av |= FILE__WRITE;
		if (av)
			error = avc_has_perm(tsec->sid, tsid,
					     SECCLASS_FILE, av, NULL);
        }

	return error;
}

static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
{
	int rc = 0;

	if (!sb)
		return 0;

	switch (cmds) {
		case Q_SYNC:
		case Q_QUOTAON:
		case Q_QUOTAOFF:
	        case Q_SETINFO:
		case Q_SETQUOTA:
			rc = superblock_has_perm(current,
						 sb,
						 FILESYSTEM__QUOTAMOD, NULL);
			break;
	        case Q_GETFMT:
	        case Q_GETINFO:
		case Q_GETQUOTA:
			rc = superblock_has_perm(current,
						 sb,
						 FILESYSTEM__QUOTAGET, NULL);
			break;
		default:
			rc = 0;  /* let the kernel handle invalid cmds */
			break;
	}
	return rc;
}

static int selinux_quota_on(struct dentry *dentry)
{
	return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
}

static int selinux_syslog(int type)
{
	int rc;

	rc = secondary_ops->syslog(type);
	if (rc)
		return rc;

	switch (type) {
		case 3:         /* Read last kernel messages */
		case 10:        /* Return size of the log buffer */
			rc = task_has_system(current, SYSTEM__SYSLOG_READ);
			break;
		case 6:         /* Disable logging to console */
		case 7:         /* Enable logging to console */
		case 8:		/* Set level of messages printed to console */
			rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
			break;
		case 0:         /* Close log */
		case 1:         /* Open log */
		case 2:         /* Read from log */
		case 4:         /* Read/clear last kernel messages */
		case 5:         /* Clear ring buffer */
		default:
			rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
			break;
	}
	return rc;
}

/*
 * Check that a process has enough memory to allocate a new virtual
 * mapping. 0 means there is enough memory for the allocation to
 * succeed and -ENOMEM implies there is not.
 *
 * Note that secondary_ops->capable and task_has_perm_noaudit return 0
 * if the capability is granted, but __vm_enough_memory requires 1 if
 * the capability is granted.
 *
 * Do not audit the selinux permission check, as this is applied to all
 * processes that allocate mappings.
 */
1828
static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
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Linus Torvalds 已提交
1829 1830 1831 1832 1833 1834 1835
{
	int rc, cap_sys_admin = 0;
	struct task_security_struct *tsec = current->security;

	rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
	if (rc == 0)
		rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1836 1837 1838 1839
					  SECCLASS_CAPABILITY,
					  CAP_TO_MASK(CAP_SYS_ADMIN),
					  0,
					  NULL);
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Linus Torvalds 已提交
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	if (rc == 0)
		cap_sys_admin = 1;

1844
	return __vm_enough_memory(mm, pages, cap_sys_admin);
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1845 1846 1847 1848 1849 1850 1851 1852
}

/* binprm security operations */

static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
{
	struct bprm_security_struct *bsec;

J
James Morris 已提交
1853
	bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
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1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	if (!bsec)
		return -ENOMEM;

	bsec->bprm = bprm;
	bsec->sid = SECINITSID_UNLABELED;
	bsec->set = 0;

	bprm->security = bsec;
	return 0;
}

static int selinux_bprm_set_security(struct linux_binprm *bprm)
{
	struct task_security_struct *tsec;
J
Josef Sipek 已提交
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	struct inode *inode = bprm->file->f_path.dentry->d_inode;
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	struct inode_security_struct *isec;
	struct bprm_security_struct *bsec;
	u32 newsid;
	struct avc_audit_data ad;
	int rc;

	rc = secondary_ops->bprm_set_security(bprm);
	if (rc)
		return rc;

	bsec = bprm->security;

	if (bsec->set)
		return 0;

	tsec = current->security;
	isec = inode->i_security;

	/* Default to the current task SID. */
	bsec->sid = tsec->sid;

1890
	/* Reset fs, key, and sock SIDs on execve. */
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	tsec->create_sid = 0;
1892
	tsec->keycreate_sid = 0;
1893
	tsec->sockcreate_sid = 0;
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	if (tsec->exec_sid) {
		newsid = tsec->exec_sid;
		/* Reset exec SID on execve. */
		tsec->exec_sid = 0;
	} else {
		/* Check for a default transition on this program. */
		rc = security_transition_sid(tsec->sid, isec->sid,
		                             SECCLASS_PROCESS, &newsid);
		if (rc)
			return rc;
	}

	AVC_AUDIT_DATA_INIT(&ad, FS);
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Josef Sipek 已提交
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	ad.u.fs.mnt = bprm->file->f_path.mnt;
	ad.u.fs.dentry = bprm->file->f_path.dentry;
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	if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
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		newsid = tsec->sid;

        if (tsec->sid == newsid) {
		rc = avc_has_perm(tsec->sid, isec->sid,
				  SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
		if (rc)
			return rc;
	} else {
		/* Check permissions for the transition. */
		rc = avc_has_perm(tsec->sid, newsid,
				  SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
		if (rc)
			return rc;

		rc = avc_has_perm(newsid, isec->sid,
				  SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
		if (rc)
			return rc;

		/* Clear any possibly unsafe personality bits on exec: */
		current->personality &= ~PER_CLEAR_ON_SETID;

		/* Set the security field to the new SID. */
		bsec->sid = newsid;
	}

	bsec->set = 1;
	return 0;
}

static int selinux_bprm_check_security (struct linux_binprm *bprm)
{
	return secondary_ops->bprm_check_security(bprm);
}


static int selinux_bprm_secureexec (struct linux_binprm *bprm)
{
	struct task_security_struct *tsec = current->security;
	int atsecure = 0;

	if (tsec->osid != tsec->sid) {
		/* Enable secure mode for SIDs transitions unless
		   the noatsecure permission is granted between
		   the two SIDs, i.e. ahp returns 0. */
		atsecure = avc_has_perm(tsec->osid, tsec->sid,
					 SECCLASS_PROCESS,
					 PROCESS__NOATSECURE, NULL);
	}

	return (atsecure || secondary_ops->bprm_secureexec(bprm));
}

static void selinux_bprm_free_security(struct linux_binprm *bprm)
{
J
Jesper Juhl 已提交
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	kfree(bprm->security);
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	bprm->security = NULL;
}

extern struct vfsmount *selinuxfs_mount;
extern struct dentry *selinux_null;

/* Derived from fs/exec.c:flush_old_files. */
static inline void flush_unauthorized_files(struct files_struct * files)
{
	struct avc_audit_data ad;
	struct file *file, *devnull = NULL;
1979
	struct tty_struct *tty;
1980
	struct fdtable *fdt;
L
Linus Torvalds 已提交
1981
	long j = -1;
1982
	int drop_tty = 0;
L
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1983

1984
	mutex_lock(&tty_mutex);
1985
	tty = get_current_tty();
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1986 1987
	if (tty) {
		file_list_lock();
E
Eric Dumazet 已提交
1988
		file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
L
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		if (file) {
			/* Revalidate access to controlling tty.
			   Use inode_has_perm on the tty inode directly rather
			   than using file_has_perm, as this particular open
			   file may belong to another process and we are only
			   interested in the inode-based check here. */
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Josef Sipek 已提交
1995
			struct inode *inode = file->f_path.dentry->d_inode;
L
Linus Torvalds 已提交
1996 1997
			if (inode_has_perm(current, inode,
					   FILE__READ | FILE__WRITE, NULL)) {
1998
				drop_tty = 1;
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			}
		}
		file_list_unlock();
	}
2003
	mutex_unlock(&tty_mutex);
2004 2005 2006
	/* Reset controlling tty. */
	if (drop_tty)
		no_tty();
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	/* Revalidate access to inherited open files. */

	AVC_AUDIT_DATA_INIT(&ad,FS);

	spin_lock(&files->file_lock);
	for (;;) {
		unsigned long set, i;
		int fd;

		j++;
		i = j * __NFDBITS;
2019
		fdt = files_fdtable(files);
2020
		if (i >= fdt->max_fds)
L
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2021
			break;
2022
		set = fdt->open_fds->fds_bits[j];
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		if (!set)
			continue;
		spin_unlock(&files->file_lock);
		for ( ; set ; i++,set >>= 1) {
			if (set & 1) {
				file = fget(i);
				if (!file)
					continue;
				if (file_has_perm(current,
						  file,
						  file_to_av(file))) {
					sys_close(i);
					fd = get_unused_fd();
					if (fd != i) {
						if (fd >= 0)
							put_unused_fd(fd);
						fput(file);
						continue;
					}
					if (devnull) {
2043
						get_file(devnull);
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Linus Torvalds 已提交
2044 2045
					} else {
						devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
2046 2047
						if (IS_ERR(devnull)) {
							devnull = NULL;
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							put_unused_fd(fd);
							fput(file);
							continue;
						}
					}
					fd_install(fd, devnull);
				}
				fput(file);
			}
		}
		spin_lock(&files->file_lock);

	}
	spin_unlock(&files->file_lock);
}

static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
{
	struct task_security_struct *tsec;
	struct bprm_security_struct *bsec;
	u32 sid;
	int rc;

	secondary_ops->bprm_apply_creds(bprm, unsafe);

	tsec = current->security;

	bsec = bprm->security;
	sid = bsec->sid;

	tsec->osid = tsec->sid;
	bsec->unsafe = 0;
	if (tsec->sid != sid) {
		/* Check for shared state.  If not ok, leave SID
		   unchanged and kill. */
		if (unsafe & LSM_UNSAFE_SHARE) {
			rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
					PROCESS__SHARE, NULL);
			if (rc) {
				bsec->unsafe = 1;
				return;
			}
		}

		/* Check for ptracing, and update the task SID if ok.
		   Otherwise, leave SID unchanged and kill. */
		if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
			rc = avc_has_perm(tsec->ptrace_sid, sid,
					  SECCLASS_PROCESS, PROCESS__PTRACE,
					  NULL);
			if (rc) {
				bsec->unsafe = 1;
				return;
			}
		}
		tsec->sid = sid;
	}
}

/*
 * called after apply_creds without the task lock held
 */
static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
{
	struct task_security_struct *tsec;
	struct rlimit *rlim, *initrlim;
	struct itimerval itimer;
	struct bprm_security_struct *bsec;
	int rc, i;

	tsec = current->security;
	bsec = bprm->security;

	if (bsec->unsafe) {
		force_sig_specific(SIGKILL, current);
		return;
	}
	if (tsec->osid == tsec->sid)
		return;

	/* Close files for which the new task SID is not authorized. */
	flush_unauthorized_files(current->files);

	/* Check whether the new SID can inherit signal state
	   from the old SID.  If not, clear itimers to avoid
	   subsequent signal generation and flush and unblock
	   signals. This must occur _after_ the task SID has
	  been updated so that any kill done after the flush
	  will be checked against the new SID. */
	rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
			  PROCESS__SIGINH, NULL);
	if (rc) {
		memset(&itimer, 0, sizeof itimer);
		for (i = 0; i < 3; i++)
			do_setitimer(i, &itimer, NULL);
		flush_signals(current);
		spin_lock_irq(&current->sighand->siglock);
		flush_signal_handlers(current, 1);
		sigemptyset(&current->blocked);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

2151 2152 2153
	/* Always clear parent death signal on SID transitions. */
	current->pdeath_signal = 0;

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	/* Check whether the new SID can inherit resource limits
	   from the old SID.  If not, reset all soft limits to
	   the lower of the current task's hard limit and the init
	   task's soft limit.  Note that the setting of hard limits
	   (even to lower them) can be controlled by the setrlimit
	   check. The inclusion of the init task's soft limit into
	   the computation is to avoid resetting soft limits higher
	   than the default soft limit for cases where the default
	   is lower than the hard limit, e.g. RLIMIT_CORE or
	   RLIMIT_STACK.*/
	rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
			  PROCESS__RLIMITINH, NULL);
	if (rc) {
		for (i = 0; i < RLIM_NLIMITS; i++) {
			rlim = current->signal->rlim + i;
			initrlim = init_task.signal->rlim+i;
			rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur);
		}
		if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
			/*
			 * This will cause RLIMIT_CPU calculations
			 * to be refigured.
			 */
			current->it_prof_expires = jiffies_to_cputime(1);
		}
	}

	/* Wake up the parent if it is waiting so that it can
	   recheck wait permission to the new task SID. */
	wake_up_interruptible(&current->parent->signal->wait_chldexit);
}

/* superblock security operations */

static int selinux_sb_alloc_security(struct super_block *sb)
{
	return superblock_alloc_security(sb);
}

static void selinux_sb_free_security(struct super_block *sb)
{
	superblock_free_security(sb);
}

static inline int match_prefix(char *prefix, int plen, char *option, int olen)
{
	if (plen > olen)
		return 0;

	return !memcmp(prefix, option, plen);
}

static inline int selinux_option(char *option, int len)
{
	return (match_prefix("context=", sizeof("context=")-1, option, len) ||
	        match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) ||
2210 2211
	        match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) ||
		match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len));
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Linus Torvalds 已提交
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}

static inline void take_option(char **to, char *from, int *first, int len)
{
	if (!*first) {
		**to = ',';
		*to += 1;
2219
	} else
L
Linus Torvalds 已提交
2220 2221 2222 2223 2224
		*first = 0;
	memcpy(*to, from, len);
	*to += len;
}

2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
static inline void take_selinux_option(char **to, char *from, int *first, 
		                       int len)
{
	int current_size = 0;

	if (!*first) {
		**to = '|';
		*to += 1;
	}
	else
		*first = 0;

	while (current_size < len) {
		if (*from != '"') {
			**to = *from;
			*to += 1;
		}
		from += 1;
		current_size += 1;
	}
}

L
Linus Torvalds 已提交
2247 2248 2249 2250 2251
static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
{
	int fnosec, fsec, rc = 0;
	char *in_save, *in_curr, *in_end;
	char *sec_curr, *nosec_save, *nosec;
2252
	int open_quote = 0;
L
Linus Torvalds 已提交
2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273

	in_curr = orig;
	sec_curr = copy;

	/* Binary mount data: just copy */
	if (type->fs_flags & FS_BINARY_MOUNTDATA) {
		copy_page(sec_curr, in_curr);
		goto out;
	}

	nosec = (char *)get_zeroed_page(GFP_KERNEL);
	if (!nosec) {
		rc = -ENOMEM;
		goto out;
	}

	nosec_save = nosec;
	fnosec = fsec = 1;
	in_save = in_end = orig;

	do {
2274 2275 2276 2277
		if (*in_end == '"')
			open_quote = !open_quote;
		if ((*in_end == ',' && open_quote == 0) ||
				*in_end == '\0') {
L
Linus Torvalds 已提交
2278 2279 2280
			int len = in_end - in_curr;

			if (selinux_option(in_curr, len))
2281
				take_selinux_option(&sec_curr, in_curr, &fsec, len);
L
Linus Torvalds 已提交
2282 2283 2284 2285 2286 2287 2288
			else
				take_option(&nosec, in_curr, &fnosec, len);

			in_curr = in_end + 1;
		}
	} while (*in_end++);

2289
	strcpy(in_save, nosec_save);
2290
	free_page((unsigned long)nosec_save);
L
Linus Torvalds 已提交
2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
out:
	return rc;
}

static int selinux_sb_kern_mount(struct super_block *sb, void *data)
{
	struct avc_audit_data ad;
	int rc;

	rc = superblock_doinit(sb, data);
	if (rc)
		return rc;

	AVC_AUDIT_DATA_INIT(&ad,FS);
	ad.u.fs.dentry = sb->s_root;
	return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
}

2309
static int selinux_sb_statfs(struct dentry *dentry)
L
Linus Torvalds 已提交
2310 2311 2312 2313
{
	struct avc_audit_data ad;

	AVC_AUDIT_DATA_INIT(&ad,FS);
2314 2315
	ad.u.fs.dentry = dentry->d_sb->s_root;
	return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
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}

static int selinux_mount(char * dev_name,
                         struct nameidata *nd,
                         char * type,
                         unsigned long flags,
                         void * data)
{
	int rc;

	rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data);
	if (rc)
		return rc;

	if (flags & MS_REMOUNT)
		return superblock_has_perm(current, nd->mnt->mnt_sb,
		                           FILESYSTEM__REMOUNT, NULL);
	else
		return dentry_has_perm(current, nd->mnt, nd->dentry,
		                       FILE__MOUNTON);
}

static int selinux_umount(struct vfsmount *mnt, int flags)
{
	int rc;

	rc = secondary_ops->sb_umount(mnt, flags);
	if (rc)
		return rc;

	return superblock_has_perm(current,mnt->mnt_sb,
	                           FILESYSTEM__UNMOUNT,NULL);
}

/* inode security operations */

static int selinux_inode_alloc_security(struct inode *inode)
{
	return inode_alloc_security(inode);
}

static void selinux_inode_free_security(struct inode *inode)
{
	inode_free_security(inode);
}

2362 2363 2364 2365 2366 2367 2368
static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
				       char **name, void **value,
				       size_t *len)
{
	struct task_security_struct *tsec;
	struct inode_security_struct *dsec;
	struct superblock_security_struct *sbsec;
2369
	u32 newsid, clen;
2370
	int rc;
2371
	char *namep = NULL, *context;
2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392

	tsec = current->security;
	dsec = dir->i_security;
	sbsec = dir->i_sb->s_security;

	if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
		newsid = tsec->create_sid;
	} else {
		rc = security_transition_sid(tsec->sid, dsec->sid,
					     inode_mode_to_security_class(inode->i_mode),
					     &newsid);
		if (rc) {
			printk(KERN_WARNING "%s:  "
			       "security_transition_sid failed, rc=%d (dev=%s "
			       "ino=%ld)\n",
			       __FUNCTION__,
			       -rc, inode->i_sb->s_id, inode->i_ino);
			return rc;
		}
	}

2393 2394 2395 2396 2397 2398 2399
	/* Possibly defer initialization to selinux_complete_init. */
	if (sbsec->initialized) {
		struct inode_security_struct *isec = inode->i_security;
		isec->sclass = inode_mode_to_security_class(inode->i_mode);
		isec->sid = newsid;
		isec->initialized = 1;
	}
2400

2401
	if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2402 2403
		return -EOPNOTSUPP;

2404 2405 2406 2407 2408 2409
	if (name) {
		namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
		if (!namep)
			return -ENOMEM;
		*name = namep;
	}
2410

2411 2412 2413 2414 2415 2416 2417 2418
	if (value && len) {
		rc = security_sid_to_context(newsid, &context, &clen);
		if (rc) {
			kfree(namep);
			return rc;
		}
		*value = context;
		*len = clen;
2419 2420 2421 2422 2423
	}

	return 0;
}

L
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static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
{
	return may_create(dir, dentry, SECCLASS_FILE);
}

static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
{
	int rc;

	rc = secondary_ops->inode_link(old_dentry,dir,new_dentry);
	if (rc)
		return rc;
	return may_link(dir, old_dentry, MAY_LINK);
}

static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
{
	int rc;

	rc = secondary_ops->inode_unlink(dir, dentry);
	if (rc)
		return rc;
	return may_link(dir, dentry, MAY_UNLINK);
}

static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
{
	return may_create(dir, dentry, SECCLASS_LNK_FILE);
}

static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
{
	return may_create(dir, dentry, SECCLASS_DIR);
}

static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
	return may_link(dir, dentry, MAY_RMDIR);
}

static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
	int rc;

	rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
	if (rc)
		return rc;

	return may_create(dir, dentry, inode_mode_to_security_class(mode));
}

static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
                                struct inode *new_inode, struct dentry *new_dentry)
{
	return may_rename(old_inode, old_dentry, new_inode, new_dentry);
}

static int selinux_inode_readlink(struct dentry *dentry)
{
	return dentry_has_perm(current, NULL, dentry, FILE__READ);
}

static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
{
	int rc;

	rc = secondary_ops->inode_follow_link(dentry,nameidata);
	if (rc)
		return rc;
	return dentry_has_perm(current, NULL, dentry, FILE__READ);
}

static int selinux_inode_permission(struct inode *inode, int mask,
				    struct nameidata *nd)
{
	int rc;

	rc = secondary_ops->inode_permission(inode, mask, nd);
	if (rc)
		return rc;

	if (!mask) {
		/* No permission to check.  Existence test. */
		return 0;
	}

	return inode_has_perm(current, inode,
			       file_mask_to_av(inode->i_mode, mask), NULL);
}

static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
{
	int rc;

	rc = secondary_ops->inode_setattr(dentry, iattr);
	if (rc)
		return rc;

	if (iattr->ia_valid & ATTR_FORCE)
		return 0;

	if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
			       ATTR_ATIME_SET | ATTR_MTIME_SET))
		return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);

	return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
}

static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
	return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
}

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static int selinux_inode_setotherxattr(struct dentry *dentry, char *name)
{
	if (!strncmp(name, XATTR_SECURITY_PREFIX,
		     sizeof XATTR_SECURITY_PREFIX - 1)) {
		if (!strcmp(name, XATTR_NAME_CAPS)) {
			if (!capable(CAP_SETFCAP))
				return -EPERM;
		} else if (!capable(CAP_SYS_ADMIN)) {
			/* A different attribute in the security namespace.
			   Restrict to administrator. */
			return -EPERM;
		}
	}

	/* Not an attribute we recognize, so just check the
	   ordinary setattr permission. */
	return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
}

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static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags)
{
	struct task_security_struct *tsec = current->security;
	struct inode *inode = dentry->d_inode;
	struct inode_security_struct *isec = inode->i_security;
	struct superblock_security_struct *sbsec;
	struct avc_audit_data ad;
	u32 newsid;
	int rc = 0;

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	if (strcmp(name, XATTR_NAME_SELINUX))
		return selinux_inode_setotherxattr(dentry, name);
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	sbsec = inode->i_sb->s_security;
	if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
		return -EOPNOTSUPP;

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	if (!is_owner_or_cap(inode))
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		return -EPERM;

	AVC_AUDIT_DATA_INIT(&ad,FS);
	ad.u.fs.dentry = dentry;

	rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
			  FILE__RELABELFROM, &ad);
	if (rc)
		return rc;

	rc = security_context_to_sid(value, size, &newsid);
	if (rc)
		return rc;

	rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
			  FILE__RELABELTO, &ad);
	if (rc)
		return rc;

	rc = security_validate_transition(isec->sid, newsid, tsec->sid,
	                                  isec->sclass);
	if (rc)
		return rc;

	return avc_has_perm(newsid,
			    sbsec->sid,
			    SECCLASS_FILESYSTEM,
			    FILESYSTEM__ASSOCIATE,
			    &ad);
}

static void selinux_inode_post_setxattr(struct dentry *dentry, char *name,
                                        void *value, size_t size, int flags)
{
	struct inode *inode = dentry->d_inode;
	struct inode_security_struct *isec = inode->i_security;
	u32 newsid;
	int rc;

	if (strcmp(name, XATTR_NAME_SELINUX)) {
		/* Not an attribute we recognize, so nothing to do. */
		return;
	}

	rc = security_context_to_sid(value, size, &newsid);
	if (rc) {
		printk(KERN_WARNING "%s:  unable to obtain SID for context "
		       "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc);
		return;
	}

	isec->sid = newsid;
	return;
}

static int selinux_inode_getxattr (struct dentry *dentry, char *name)
{
	return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
}

static int selinux_inode_listxattr (struct dentry *dentry)
{
	return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
}

static int selinux_inode_removexattr (struct dentry *dentry, char *name)
{
2641 2642
	if (strcmp(name, XATTR_NAME_SELINUX))
		return selinux_inode_setotherxattr(dentry, name);
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	/* No one is allowed to remove a SELinux security label.
	   You can change the label, but all data must be labeled. */
	return -EACCES;
}

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/*
 * Copy the in-core inode security context value to the user.  If the
 * getxattr() prior to this succeeded, check to see if we need to
 * canonicalize the value to be finally returned to the user.
 *
 * Permission check is handled by selinux_inode_getxattr hook.
 */
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static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void *buffer, size_t size, int err)
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{
	struct inode_security_struct *isec = inode->i_security;
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2660 2661
	if (strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;
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	return selinux_getsecurity(isec->sid, buffer, size);
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}

static int selinux_inode_setsecurity(struct inode *inode, const char *name,
                                     const void *value, size_t size, int flags)
{
	struct inode_security_struct *isec = inode->i_security;
	u32 newsid;
	int rc;

	if (strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;

	if (!value || !size)
		return -EACCES;

	rc = security_context_to_sid((void*)value, size, &newsid);
	if (rc)
		return rc;

	isec->sid = newsid;
	return 0;
}

static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
{
	const int len = sizeof(XATTR_NAME_SELINUX);
	if (buffer && len <= buffer_size)
		memcpy(buffer, XATTR_NAME_SELINUX, len);
	return len;
}

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static int selinux_inode_need_killpriv(struct dentry *dentry)
{
	return secondary_ops->inode_need_killpriv(dentry);
}

static int selinux_inode_killpriv(struct dentry *dentry)
{
	return secondary_ops->inode_killpriv(dentry);
}

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/* file security operations */

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static int selinux_revalidate_file_permission(struct file *file, int mask)
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{
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	int rc;
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	struct inode *inode = file->f_path.dentry->d_inode;
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	if (!mask) {
		/* No permission to check.  Existence test. */
		return 0;
	}

	/* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
	if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
		mask |= MAY_APPEND;

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	rc = file_has_perm(current, file,
			   file_mask_to_av(inode->i_mode, mask));
	if (rc)
		return rc;

	return selinux_netlbl_inode_permission(inode, mask);
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}

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static int selinux_file_permission(struct file *file, int mask)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	struct task_security_struct *tsec = current->security;
	struct file_security_struct *fsec = file->f_security;
	struct inode_security_struct *isec = inode->i_security;

	if (!mask) {
		/* No permission to check.  Existence test. */
		return 0;
	}

	if (tsec->sid == fsec->sid && fsec->isid == isec->sid
	    && fsec->pseqno == avc_policy_seqno())
		return selinux_netlbl_inode_permission(inode, mask);

	return selinux_revalidate_file_permission(file, mask);
}

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static int selinux_file_alloc_security(struct file *file)
{
	return file_alloc_security(file);
}

static void selinux_file_free_security(struct file *file)
{
	file_free_security(file);
}

static int selinux_file_ioctl(struct file *file, unsigned int cmd,
			      unsigned long arg)
{
	int error = 0;

	switch (cmd) {
		case FIONREAD:
		/* fall through */
		case FIBMAP:
		/* fall through */
		case FIGETBSZ:
		/* fall through */
		case EXT2_IOC_GETFLAGS:
		/* fall through */
		case EXT2_IOC_GETVERSION:
			error = file_has_perm(current, file, FILE__GETATTR);
			break;

		case EXT2_IOC_SETFLAGS:
		/* fall through */
		case EXT2_IOC_SETVERSION:
			error = file_has_perm(current, file, FILE__SETATTR);
			break;

		/* sys_ioctl() checks */
		case FIONBIO:
		/* fall through */
		case FIOASYNC:
			error = file_has_perm(current, file, 0);
			break;

	        case KDSKBENT:
	        case KDSKBSENT:
			error = task_has_capability(current,CAP_SYS_TTY_CONFIG);
			break;

		/* default case assumes that the command will go
		 * to the file's ioctl() function.
		 */
		default:
			error = file_has_perm(current, file, FILE__IOCTL);

	}
	return error;
}

static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
{
#ifndef CONFIG_PPC32
	if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
		/*
		 * We are making executable an anonymous mapping or a
		 * private file mapping that will also be writable.
		 * This has an additional check.
		 */
		int rc = task_has_perm(current, current, PROCESS__EXECMEM);
		if (rc)
			return rc;
	}
#endif

	if (file) {
		/* read access is always possible with a mapping */
		u32 av = FILE__READ;

		/* write access only matters if the mapping is shared */
		if (shared && (prot & PROT_WRITE))
			av |= FILE__WRITE;

		if (prot & PROT_EXEC)
			av |= FILE__EXECUTE;

		return file_has_perm(current, file, av);
	}
	return 0;
}

static int selinux_file_mmap(struct file *file, unsigned long reqprot,
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			     unsigned long prot, unsigned long flags,
			     unsigned long addr, unsigned long addr_only)
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{
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	int rc = 0;
	u32 sid = ((struct task_security_struct*)(current->security))->sid;
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	if (addr < mmap_min_addr)
		rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
				  MEMPROTECT__MMAP_ZERO, NULL);
	if (rc || addr_only)
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		return rc;

	if (selinux_checkreqprot)
		prot = reqprot;

	return file_map_prot_check(file, prot,
				   (flags & MAP_TYPE) == MAP_SHARED);
}

static int selinux_file_mprotect(struct vm_area_struct *vma,
				 unsigned long reqprot,
				 unsigned long prot)
{
	int rc;

	rc = secondary_ops->file_mprotect(vma, reqprot, prot);
	if (rc)
		return rc;

	if (selinux_checkreqprot)
		prot = reqprot;

#ifndef CONFIG_PPC32
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	if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
		rc = 0;
		if (vma->vm_start >= vma->vm_mm->start_brk &&
		    vma->vm_end <= vma->vm_mm->brk) {
			rc = task_has_perm(current, current,
					   PROCESS__EXECHEAP);
		} else if (!vma->vm_file &&
			   vma->vm_start <= vma->vm_mm->start_stack &&
			   vma->vm_end >= vma->vm_mm->start_stack) {
			rc = task_has_perm(current, current, PROCESS__EXECSTACK);
		} else if (vma->vm_file && vma->anon_vma) {
			/*
			 * We are making executable a file mapping that has
			 * had some COW done. Since pages might have been
			 * written, check ability to execute the possibly
			 * modified content.  This typically should only
			 * occur for text relocations.
			 */
			rc = file_has_perm(current, vma->vm_file,
					   FILE__EXECMOD);
		}
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		if (rc)
			return rc;
	}
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#endif

	return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
}

static int selinux_file_lock(struct file *file, unsigned int cmd)
{
	return file_has_perm(current, file, FILE__LOCK);
}

static int selinux_file_fcntl(struct file *file, unsigned int cmd,
			      unsigned long arg)
{
	int err = 0;

	switch (cmd) {
	        case F_SETFL:
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			if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
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				err = -EINVAL;
				break;
			}

			if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
				err = file_has_perm(current, file,FILE__WRITE);
				break;
			}
			/* fall through */
	        case F_SETOWN:
	        case F_SETSIG:
	        case F_GETFL:
	        case F_GETOWN:
	        case F_GETSIG:
			/* Just check FD__USE permission */
			err = file_has_perm(current, file, 0);
			break;
		case F_GETLK:
		case F_SETLK:
	        case F_SETLKW:
#if BITS_PER_LONG == 32
	        case F_GETLK64:
		case F_SETLK64:
	        case F_SETLKW64:
#endif
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			if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
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				err = -EINVAL;
				break;
			}
			err = file_has_perm(current, file, FILE__LOCK);
			break;
	}

	return err;
}

static int selinux_file_set_fowner(struct file *file)
{
	struct task_security_struct *tsec;
	struct file_security_struct *fsec;

	tsec = current->security;
	fsec = file->f_security;
	fsec->fown_sid = tsec->sid;

	return 0;
}

static int selinux_file_send_sigiotask(struct task_struct *tsk,
				       struct fown_struct *fown, int signum)
{
        struct file *file;
	u32 perm;
	struct task_security_struct *tsec;
	struct file_security_struct *fsec;

	/* struct fown_struct is never outside the context of a struct file */
2968
        file = container_of(fown, struct file, f_owner);
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	tsec = tsk->security;
	fsec = file->f_security;

	if (!signum)
		perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
	else
		perm = signal_to_av(signum);

	return avc_has_perm(fsec->fown_sid, tsec->sid,
			    SECCLASS_PROCESS, perm, NULL);
}

static int selinux_file_receive(struct file *file)
{
	return file_has_perm(current, file, file_to_av(file));
}

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static int selinux_dentry_open(struct file *file)
{
	struct file_security_struct *fsec;
	struct inode *inode;
	struct inode_security_struct *isec;
	inode = file->f_path.dentry->d_inode;
	fsec = file->f_security;
	isec = inode->i_security;
	/*
	 * Save inode label and policy sequence number
	 * at open-time so that selinux_file_permission
	 * can determine whether revalidation is necessary.
	 * Task label is already saved in the file security
	 * struct as its SID.
	 */
	fsec->isid = isec->sid;
	fsec->pseqno = avc_policy_seqno();
	/*
	 * Since the inode label or policy seqno may have changed
	 * between the selinux_inode_permission check and the saving
	 * of state above, recheck that access is still permitted.
	 * Otherwise, access might never be revalidated against the
	 * new inode label or new policy.
	 * This check is not redundant - do not remove.
	 */
	return inode_has_perm(current, inode, file_to_av(file), NULL);
}

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/* task security operations */

static int selinux_task_create(unsigned long clone_flags)
{
	int rc;

	rc = secondary_ops->task_create(clone_flags);
	if (rc)
		return rc;

	return task_has_perm(current, current, PROCESS__FORK);
}

static int selinux_task_alloc_security(struct task_struct *tsk)
{
	struct task_security_struct *tsec1, *tsec2;
	int rc;

	tsec1 = current->security;

	rc = task_alloc_security(tsk);
	if (rc)
		return rc;
	tsec2 = tsk->security;

	tsec2->osid = tsec1->osid;
	tsec2->sid = tsec1->sid;

3043
	/* Retain the exec, fs, key, and sock SIDs across fork */
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	tsec2->exec_sid = tsec1->exec_sid;
	tsec2->create_sid = tsec1->create_sid;
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	tsec2->keycreate_sid = tsec1->keycreate_sid;
3047
	tsec2->sockcreate_sid = tsec1->sockcreate_sid;
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	/* Retain ptracer SID across fork, if any.
	   This will be reset by the ptrace hook upon any
	   subsequent ptrace_attach operations. */
	tsec2->ptrace_sid = tsec1->ptrace_sid;

	return 0;
}

static void selinux_task_free_security(struct task_struct *tsk)
{
	task_free_security(tsk);
}

static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
{
	/* Since setuid only affects the current process, and
	   since the SELinux controls are not based on the Linux
	   identity attributes, SELinux does not need to control
	   this operation.  However, SELinux does control the use
	   of the CAP_SETUID and CAP_SETGID capabilities using the
	   capable hook. */
	return 0;
}

static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
{
	return secondary_ops->task_post_setuid(id0,id1,id2,flags);
}

static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
{
	/* See the comment for setuid above. */
	return 0;
}

static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
{
	return task_has_perm(current, p, PROCESS__SETPGID);
}

static int selinux_task_getpgid(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__GETPGID);
}

static int selinux_task_getsid(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__GETSESSION);
}

3099 3100 3101 3102 3103
static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
{
	selinux_get_task_sid(p, secid);
}

L
Linus Torvalds 已提交
3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120
static int selinux_task_setgroups(struct group_info *group_info)
{
	/* See the comment for setuid above. */
	return 0;
}

static int selinux_task_setnice(struct task_struct *p, int nice)
{
	int rc;

	rc = secondary_ops->task_setnice(p, nice);
	if (rc)
		return rc;

	return task_has_perm(current,p, PROCESS__SETSCHED);
}

3121 3122
static int selinux_task_setioprio(struct task_struct *p, int ioprio)
{
3123 3124 3125 3126 3127 3128
	int rc;

	rc = secondary_ops->task_setioprio(p, ioprio);
	if (rc)
		return rc;

3129 3130 3131
	return task_has_perm(current, p, PROCESS__SETSCHED);
}

3132 3133 3134 3135 3136
static int selinux_task_getioprio(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__GETSCHED);
}

L
Linus Torvalds 已提交
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157
static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
{
	struct rlimit *old_rlim = current->signal->rlim + resource;
	int rc;

	rc = secondary_ops->task_setrlimit(resource, new_rlim);
	if (rc)
		return rc;

	/* Control the ability to change the hard limit (whether
	   lowering or raising it), so that the hard limit can
	   later be used as a safe reset point for the soft limit
	   upon context transitions. See selinux_bprm_apply_creds. */
	if (old_rlim->rlim_max != new_rlim->rlim_max)
		return task_has_perm(current, current, PROCESS__SETRLIMIT);

	return 0;
}

static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
{
3158 3159 3160 3161 3162 3163
	int rc;

	rc = secondary_ops->task_setscheduler(p, policy, lp);
	if (rc)
		return rc;

L
Linus Torvalds 已提交
3164 3165 3166 3167 3168 3169 3170 3171
	return task_has_perm(current, p, PROCESS__SETSCHED);
}

static int selinux_task_getscheduler(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__GETSCHED);
}

3172 3173 3174 3175 3176
static int selinux_task_movememory(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__SETSCHED);
}

3177 3178
static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
				int sig, u32 secid)
L
Linus Torvalds 已提交
3179 3180 3181
{
	u32 perm;
	int rc;
3182
	struct task_security_struct *tsec;
L
Linus Torvalds 已提交
3183

3184
	rc = secondary_ops->task_kill(p, info, sig, secid);
L
Linus Torvalds 已提交
3185 3186 3187
	if (rc)
		return rc;

3188
	if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
L
Linus Torvalds 已提交
3189 3190 3191 3192 3193 3194
		return 0;

	if (!sig)
		perm = PROCESS__SIGNULL; /* null signal; existence test */
	else
		perm = signal_to_av(sig);
3195 3196 3197 3198 3199 3200
	tsec = p->security;
	if (secid)
		rc = avc_has_perm(secid, tsec->sid, SECCLASS_PROCESS, perm, NULL);
	else
		rc = task_has_perm(current, p, perm);
	return rc;
L
Linus Torvalds 已提交
3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216
}

static int selinux_task_prctl(int option,
			      unsigned long arg2,
			      unsigned long arg3,
			      unsigned long arg4,
			      unsigned long arg5)
{
	/* The current prctl operations do not appear to require
	   any SELinux controls since they merely observe or modify
	   the state of the current process. */
	return 0;
}

static int selinux_task_wait(struct task_struct *p)
{
3217
	return task_has_perm(p, current, PROCESS__SIGCHLD);
L
Linus Torvalds 已提交
3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
}

static void selinux_task_reparent_to_init(struct task_struct *p)
{
  	struct task_security_struct *tsec;

	secondary_ops->task_reparent_to_init(p);

	tsec = p->security;
	tsec->osid = tsec->sid;
	tsec->sid = SECINITSID_KERNEL;
	return;
}

static void selinux_task_to_inode(struct task_struct *p,
				  struct inode *inode)
{
	struct task_security_struct *tsec = p->security;
	struct inode_security_struct *isec = inode->i_security;

	isec->sid = tsec->sid;
	isec->initialized = 1;
	return;
}

/* Returns error only if unable to parse addresses */
3244 3245
static int selinux_parse_skb_ipv4(struct sk_buff *skb,
			struct avc_audit_data *ad, u8 *proto)
L
Linus Torvalds 已提交
3246 3247 3248 3249
{
	int offset, ihlen, ret = -EINVAL;
	struct iphdr _iph, *ih;

3250
	offset = skb_network_offset(skb);
L
Linus Torvalds 已提交
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262
	ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
	if (ih == NULL)
		goto out;

	ihlen = ih->ihl * 4;
	if (ihlen < sizeof(_iph))
		goto out;

	ad->u.net.v4info.saddr = ih->saddr;
	ad->u.net.v4info.daddr = ih->daddr;
	ret = 0;

3263 3264 3265
	if (proto)
		*proto = ih->protocol;

L
Linus Torvalds 已提交
3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
	switch (ih->protocol) {
        case IPPROTO_TCP: {
        	struct tcphdr _tcph, *th;

        	if (ntohs(ih->frag_off) & IP_OFFSET)
        		break;

		offset += ihlen;
		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net.sport = th->source;
		ad->u.net.dport = th->dest;
		break;
        }
        
        case IPPROTO_UDP: {
        	struct udphdr _udph, *uh;
        	
        	if (ntohs(ih->frag_off) & IP_OFFSET)
        		break;
        		
		offset += ihlen;
        	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;	

        	ad->u.net.sport = uh->source;
        	ad->u.net.dport = uh->dest;
        	break;
        }

J
James Morris 已提交
3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314
	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		offset += ihlen;
		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net.sport = dh->dccph_sport;
		ad->u.net.dport = dh->dccph_dport;
		break;
        }

L
Linus Torvalds 已提交
3315 3316 3317 3318 3319 3320 3321 3322 3323 3324
        default:
        	break;
        }
out:
	return ret;
}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

/* Returns error only if unable to parse addresses */
3325 3326
static int selinux_parse_skb_ipv6(struct sk_buff *skb,
			struct avc_audit_data *ad, u8 *proto)
L
Linus Torvalds 已提交
3327 3328 3329 3330 3331
{
	u8 nexthdr;
	int ret = -EINVAL, offset;
	struct ipv6hdr _ipv6h, *ip6;

3332
	offset = skb_network_offset(skb);
L
Linus Torvalds 已提交
3333 3334 3335 3336 3337 3338 3339 3340 3341 3342
	ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
	if (ip6 == NULL)
		goto out;

	ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
	ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
	ret = 0;

	nexthdr = ip6->nexthdr;
	offset += sizeof(_ipv6h);
3343
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
L
Linus Torvalds 已提交
3344 3345 3346
	if (offset < 0)
		goto out;

3347 3348 3349
	if (proto)
		*proto = nexthdr;

L
Linus Torvalds 已提交
3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374
	switch (nexthdr) {
	case IPPROTO_TCP: {
        	struct tcphdr _tcph, *th;

		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net.sport = th->source;
		ad->u.net.dport = th->dest;
		break;
	}

	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net.sport = uh->source;
		ad->u.net.dport = uh->dest;
		break;
	}

J
James Morris 已提交
3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net.sport = dh->dccph_sport;
		ad->u.net.dport = dh->dccph_dport;
		break;
        }

L
Linus Torvalds 已提交
3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397
	/* includes fragments */
	default:
		break;
	}
out:
	return ret;
}

#endif /* IPV6 */

static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
3398
			     char **addrp, int *len, int src, u8 *proto)
L
Linus Torvalds 已提交
3399 3400 3401 3402 3403
{
	int ret = 0;

	switch (ad->u.net.family) {
	case PF_INET:
3404
		ret = selinux_parse_skb_ipv4(skb, ad, proto);
L
Linus Torvalds 已提交
3405 3406 3407 3408 3409 3410 3411 3412 3413
		if (ret || !addrp)
			break;
		*len = 4;
		*addrp = (char *)(src ? &ad->u.net.v4info.saddr :
					&ad->u.net.v4info.daddr);
		break;

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case PF_INET6:
3414
		ret = selinux_parse_skb_ipv6(skb, ad, proto);
L
Linus Torvalds 已提交
3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428
		if (ret || !addrp)
			break;
		*len = 16;
		*addrp = (char *)(src ? &ad->u.net.v6info.saddr :
					&ad->u.net.v6info.daddr);
		break;
#endif	/* IPV6 */
	default:
		break;
	}

	return ret;
}

3429 3430 3431
/**
 * selinux_skb_extlbl_sid - Determine the external label of a packet
 * @skb: the packet
3432
 * @family: protocol family
3433 3434 3435 3436
 * @sid: the packet's SID
 *
 * Description:
 * Check the various different forms of external packet labeling and determine
3437 3438 3439 3440 3441 3442
 * the external SID for the packet.  If only one form of external labeling is
 * present then it is used, if both labeled IPsec and NetLabel labels are
 * present then the SELinux type information is taken from the labeled IPsec
 * SA and the MLS sensitivity label information is taken from the NetLabel
 * security attributes.  This bit of "magic" is done in the call to
 * selinux_netlbl_skbuff_getsid().
3443 3444
 *
 */
3445 3446 3447
static void selinux_skb_extlbl_sid(struct sk_buff *skb,
				   u16 family,
				   u32 *sid)
3448 3449 3450 3451 3452 3453
{
	u32 xfrm_sid;
	u32 nlbl_sid;

	selinux_skb_xfrm_sid(skb, &xfrm_sid);
	if (selinux_netlbl_skbuff_getsid(skb,
3454
					 family,
3455
					 (xfrm_sid == SECSID_NULL ?
3456
					  SECINITSID_NETMSG : xfrm_sid),
3457 3458 3459 3460 3461
					 &nlbl_sid) != 0)
		nlbl_sid = SECSID_NULL;
	*sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid);
}

L
Linus Torvalds 已提交
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489
/* socket security operations */
static int socket_has_perm(struct task_struct *task, struct socket *sock,
			   u32 perms)
{
	struct inode_security_struct *isec;
	struct task_security_struct *tsec;
	struct avc_audit_data ad;
	int err = 0;

	tsec = task->security;
	isec = SOCK_INODE(sock)->i_security;

	if (isec->sid == SECINITSID_KERNEL)
		goto out;

	AVC_AUDIT_DATA_INIT(&ad,NET);
	ad.u.net.sk = sock->sk;
	err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);

out:
	return err;
}

static int selinux_socket_create(int family, int type,
				 int protocol, int kern)
{
	int err = 0;
	struct task_security_struct *tsec;
3490
	u32 newsid;
L
Linus Torvalds 已提交
3491 3492 3493 3494 3495

	if (kern)
		goto out;

	tsec = current->security;
3496 3497
	newsid = tsec->sockcreate_sid ? : tsec->sid;
	err = avc_has_perm(tsec->sid, newsid,
L
Linus Torvalds 已提交
3498 3499 3500 3501 3502 3503 3504
			   socket_type_to_security_class(family, type,
			   protocol), SOCKET__CREATE, NULL);

out:
	return err;
}

V
Venkat Yekkirala 已提交
3505 3506
static int selinux_socket_post_create(struct socket *sock, int family,
				      int type, int protocol, int kern)
L
Linus Torvalds 已提交
3507
{
V
Venkat Yekkirala 已提交
3508
	int err = 0;
L
Linus Torvalds 已提交
3509 3510
	struct inode_security_struct *isec;
	struct task_security_struct *tsec;
3511
	struct sk_security_struct *sksec;
3512
	u32 newsid;
L
Linus Torvalds 已提交
3513 3514 3515 3516

	isec = SOCK_INODE(sock)->i_security;

	tsec = current->security;
3517
	newsid = tsec->sockcreate_sid ? : tsec->sid;
L
Linus Torvalds 已提交
3518
	isec->sclass = socket_type_to_security_class(family, type, protocol);
3519
	isec->sid = kern ? SECINITSID_KERNEL : newsid;
L
Linus Torvalds 已提交
3520 3521
	isec->initialized = 1;

3522 3523 3524
	if (sock->sk) {
		sksec = sock->sk->sk_security;
		sksec->sid = isec->sid;
P
Paul Moore 已提交
3525
		err = selinux_netlbl_socket_post_create(sock);
3526 3527
	}

V
Venkat Yekkirala 已提交
3528
	return err;
L
Linus Torvalds 已提交
3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545
}

/* Range of port numbers used to automatically bind.
   Need to determine whether we should perform a name_bind
   permission check between the socket and the port number. */

static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
{
	u16 family;
	int err;

	err = socket_has_perm(current, sock, SOCKET__BIND);
	if (err)
		goto out;

	/*
	 * If PF_INET or PF_INET6, check name_bind permission for the port.
3546 3547
	 * Multiple address binding for SCTP is not supported yet: we just
	 * check the first address now.
L
Linus Torvalds 已提交
3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575
	 */
	family = sock->sk->sk_family;
	if (family == PF_INET || family == PF_INET6) {
		char *addrp;
		struct inode_security_struct *isec;
		struct task_security_struct *tsec;
		struct avc_audit_data ad;
		struct sockaddr_in *addr4 = NULL;
		struct sockaddr_in6 *addr6 = NULL;
		unsigned short snum;
		struct sock *sk = sock->sk;
		u32 sid, node_perm, addrlen;

		tsec = current->security;
		isec = SOCK_INODE(sock)->i_security;

		if (family == PF_INET) {
			addr4 = (struct sockaddr_in *)address;
			snum = ntohs(addr4->sin_port);
			addrlen = sizeof(addr4->sin_addr.s_addr);
			addrp = (char *)&addr4->sin_addr.s_addr;
		} else {
			addr6 = (struct sockaddr_in6 *)address;
			snum = ntohs(addr6->sin6_port);
			addrlen = sizeof(addr6->sin6_addr.s6_addr);
			addrp = (char *)&addr6->sin6_addr.s6_addr;
		}

3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596
		if (snum) {
			int low, high;

			inet_get_local_port_range(&low, &high);

			if (snum < max(PROT_SOCK, low) || snum > high) {
				err = security_port_sid(sk->sk_family,
							sk->sk_type,
							sk->sk_protocol, snum,
							&sid);
				if (err)
					goto out;
				AVC_AUDIT_DATA_INIT(&ad,NET);
				ad.u.net.sport = htons(snum);
				ad.u.net.family = family;
				err = avc_has_perm(isec->sid, sid,
						   isec->sclass,
						   SOCKET__NAME_BIND, &ad);
				if (err)
					goto out;
			}
L
Linus Torvalds 已提交
3597 3598
		}
		
3599 3600
		switch(isec->sclass) {
		case SECCLASS_TCP_SOCKET:
L
Linus Torvalds 已提交
3601 3602 3603
			node_perm = TCP_SOCKET__NODE_BIND;
			break;
			
3604
		case SECCLASS_UDP_SOCKET:
L
Linus Torvalds 已提交
3605 3606
			node_perm = UDP_SOCKET__NODE_BIND;
			break;
J
James Morris 已提交
3607 3608 3609 3610 3611

		case SECCLASS_DCCP_SOCKET:
			node_perm = DCCP_SOCKET__NODE_BIND;
			break;

L
Linus Torvalds 已提交
3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648
		default:
			node_perm = RAWIP_SOCKET__NODE_BIND;
			break;
		}
		
		err = security_node_sid(family, addrp, addrlen, &sid);
		if (err)
			goto out;
		
		AVC_AUDIT_DATA_INIT(&ad,NET);
		ad.u.net.sport = htons(snum);
		ad.u.net.family = family;

		if (family == PF_INET)
			ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
		else
			ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);

		err = avc_has_perm(isec->sid, sid,
		                   isec->sclass, node_perm, &ad);
		if (err)
			goto out;
	}
out:
	return err;
}

static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
{
	struct inode_security_struct *isec;
	int err;

	err = socket_has_perm(current, sock, SOCKET__CONNECT);
	if (err)
		return err;

	/*
J
James Morris 已提交
3649
	 * If a TCP or DCCP socket, check name_connect permission for the port.
L
Linus Torvalds 已提交
3650 3651
	 */
	isec = SOCK_INODE(sock)->i_security;
J
James Morris 已提交
3652 3653
	if (isec->sclass == SECCLASS_TCP_SOCKET ||
	    isec->sclass == SECCLASS_DCCP_SOCKET) {
L
Linus Torvalds 已提交
3654 3655 3656 3657 3658
		struct sock *sk = sock->sk;
		struct avc_audit_data ad;
		struct sockaddr_in *addr4 = NULL;
		struct sockaddr_in6 *addr6 = NULL;
		unsigned short snum;
J
James Morris 已提交
3659
		u32 sid, perm;
L
Linus Torvalds 已提交
3660 3661 3662

		if (sk->sk_family == PF_INET) {
			addr4 = (struct sockaddr_in *)address;
3663
			if (addrlen < sizeof(struct sockaddr_in))
L
Linus Torvalds 已提交
3664 3665 3666 3667
				return -EINVAL;
			snum = ntohs(addr4->sin_port);
		} else {
			addr6 = (struct sockaddr_in6 *)address;
3668
			if (addrlen < SIN6_LEN_RFC2133)
L
Linus Torvalds 已提交
3669 3670 3671 3672 3673 3674 3675 3676 3677
				return -EINVAL;
			snum = ntohs(addr6->sin6_port);
		}

		err = security_port_sid(sk->sk_family, sk->sk_type,
					sk->sk_protocol, snum, &sid);
		if (err)
			goto out;

J
James Morris 已提交
3678 3679 3680
		perm = (isec->sclass == SECCLASS_TCP_SOCKET) ?
		       TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;

L
Linus Torvalds 已提交
3681 3682 3683
		AVC_AUDIT_DATA_INIT(&ad,NET);
		ad.u.net.dport = htons(snum);
		ad.u.net.family = sk->sk_family;
J
James Morris 已提交
3684
		err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad);
L
Linus Torvalds 已提交
3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720
		if (err)
			goto out;
	}

out:
	return err;
}

static int selinux_socket_listen(struct socket *sock, int backlog)
{
	return socket_has_perm(current, sock, SOCKET__LISTEN);
}

static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
{
	int err;
	struct inode_security_struct *isec;
	struct inode_security_struct *newisec;

	err = socket_has_perm(current, sock, SOCKET__ACCEPT);
	if (err)
		return err;

	newisec = SOCK_INODE(newsock)->i_security;

	isec = SOCK_INODE(sock)->i_security;
	newisec->sclass = isec->sclass;
	newisec->sid = isec->sid;
	newisec->initialized = 1;

	return 0;
}

static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
 				  int size)
{
V
Venkat Yekkirala 已提交
3721 3722 3723 3724 3725 3726 3727
	int rc;

	rc = socket_has_perm(current, sock, SOCKET__WRITE);
	if (rc)
		return rc;

	return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE);
L
Linus Torvalds 已提交
3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747
}

static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
				  int size, int flags)
{
	return socket_has_perm(current, sock, SOCKET__READ);
}

static int selinux_socket_getsockname(struct socket *sock)
{
	return socket_has_perm(current, sock, SOCKET__GETATTR);
}

static int selinux_socket_getpeername(struct socket *sock)
{
	return socket_has_perm(current, sock, SOCKET__GETATTR);
}

static int selinux_socket_setsockopt(struct socket *sock,int level,int optname)
{
3748 3749 3750 3751 3752 3753 3754
	int err;

	err = socket_has_perm(current, sock, SOCKET__SETOPT);
	if (err)
		return err;

	return selinux_netlbl_socket_setsockopt(sock, level, optname);
L
Linus Torvalds 已提交
3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
}

static int selinux_socket_getsockopt(struct socket *sock, int level,
				     int optname)
{
	return socket_has_perm(current, sock, SOCKET__GETOPT);
}

static int selinux_socket_shutdown(struct socket *sock, int how)
{
	return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
}

static int selinux_socket_unix_stream_connect(struct socket *sock,
					      struct socket *other,
					      struct sock *newsk)
{
	struct sk_security_struct *ssec;
	struct inode_security_struct *isec;
	struct inode_security_struct *other_isec;
	struct avc_audit_data ad;
	int err;

	err = secondary_ops->unix_stream_connect(sock, other, newsk);
	if (err)
		return err;

	isec = SOCK_INODE(sock)->i_security;
	other_isec = SOCK_INODE(other)->i_security;

	AVC_AUDIT_DATA_INIT(&ad,NET);
	ad.u.net.sk = other->sk;

	err = avc_has_perm(isec->sid, other_isec->sid,
			   isec->sclass,
			   UNIX_STREAM_SOCKET__CONNECTTO, &ad);
	if (err)
		return err;

	/* connecting socket */
	ssec = sock->sk->sk_security;
	ssec->peer_sid = other_isec->sid;
	
	/* server child socket */
	ssec = newsk->sk_security;
	ssec->peer_sid = isec->sid;
3801 3802 3803
	err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid);

	return err;
L
Linus Torvalds 已提交
3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827
}

static int selinux_socket_unix_may_send(struct socket *sock,
					struct socket *other)
{
	struct inode_security_struct *isec;
	struct inode_security_struct *other_isec;
	struct avc_audit_data ad;
	int err;

	isec = SOCK_INODE(sock)->i_security;
	other_isec = SOCK_INODE(other)->i_security;

	AVC_AUDIT_DATA_INIT(&ad,NET);
	ad.u.net.sk = other->sk;

	err = avc_has_perm(isec->sid, other_isec->sid,
			   isec->sclass, SOCKET__SENDTO, &ad);
	if (err)
		return err;

	return 0;
}

3828
static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
3829
		struct avc_audit_data *ad, u16 family, char *addrp, int len)
L
Linus Torvalds 已提交
3830
{
3831
	int err = 0;
L
Linus Torvalds 已提交
3832
	u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
	struct socket *sock;
	u16 sock_class = 0;
	u32 sock_sid = 0;

 	read_lock_bh(&sk->sk_callback_lock);
 	sock = sk->sk_socket;
 	if (sock) {
 		struct inode *inode;
 		inode = SOCK_INODE(sock);
 		if (inode) {
 			struct inode_security_struct *isec;
 			isec = inode->i_security;
 			sock_sid = isec->sid;
 			sock_class = isec->sclass;
 		}
 	}
 	read_unlock_bh(&sk->sk_callback_lock);
 	if (!sock_sid)
  		goto out;
L
Linus Torvalds 已提交
3852

3853
	if (!skb->dev)
L
Linus Torvalds 已提交
3854 3855
		goto out;

3856
	err = sel_netif_sids(skb->dev, &if_sid, NULL);
L
Linus Torvalds 已提交
3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
	if (err)
		goto out;

	switch (sock_class) {
	case SECCLASS_UDP_SOCKET:
		netif_perm = NETIF__UDP_RECV;
		node_perm = NODE__UDP_RECV;
		recv_perm = UDP_SOCKET__RECV_MSG;
		break;
	
	case SECCLASS_TCP_SOCKET:
		netif_perm = NETIF__TCP_RECV;
		node_perm = NODE__TCP_RECV;
		recv_perm = TCP_SOCKET__RECV_MSG;
		break;
J
James Morris 已提交
3872 3873 3874 3875 3876 3877 3878

	case SECCLASS_DCCP_SOCKET:
		netif_perm = NETIF__DCCP_RECV;
		node_perm = NODE__DCCP_RECV;
		recv_perm = DCCP_SOCKET__RECV_MSG;
		break;

L
Linus Torvalds 已提交
3879 3880 3881 3882 3883 3884
	default:
		netif_perm = NETIF__RAWIP_RECV;
		node_perm = NODE__RAWIP_RECV;
		break;
	}

3885
	err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
L
Linus Torvalds 已提交
3886 3887 3888 3889 3890 3891 3892
	if (err)
		goto out;
	
	err = security_node_sid(family, addrp, len, &node_sid);
	if (err)
		goto out;
	
3893
	err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, ad);
L
Linus Torvalds 已提交
3894 3895 3896 3897 3898 3899 3900
	if (err)
		goto out;

	if (recv_perm) {
		u32 port_sid;

		err = security_port_sid(sk->sk_family, sk->sk_type,
3901
		                        sk->sk_protocol, ntohs(ad->u.net.sport),
L
Linus Torvalds 已提交
3902 3903 3904 3905 3906
		                        &port_sid);
		if (err)
			goto out;

		err = avc_has_perm(sock_sid, port_sid,
3907
				   sock_class, recv_perm, ad);
L
Linus Torvalds 已提交
3908
	}
3909

3910 3911 3912 3913 3914 3915 3916 3917 3918 3919
out:
	return err;
}

static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	u16 family;
	char *addrp;
	int len, err = 0;
	struct avc_audit_data ad;
3920
	struct sk_security_struct *sksec = sk->sk_security;
3921 3922 3923 3924 3925 3926

	family = sk->sk_family;
	if (family != PF_INET && family != PF_INET6)
		goto out;

	/* Handle mapped IPv4 packets arriving via IPv6 sockets */
A
Al Viro 已提交
3927
	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3928 3929 3930 3931 3932 3933
		family = PF_INET;

	AVC_AUDIT_DATA_INIT(&ad, NET);
	ad.u.net.netif = skb->dev ? skb->dev->name : "[unknown]";
	ad.u.net.family = family;

3934
	err = selinux_parse_skb(skb, &ad, &addrp, &len, 1, NULL);
3935 3936 3937 3938
	if (err)
		goto out;

	if (selinux_compat_net)
3939
		err = selinux_sock_rcv_skb_compat(sk, skb, &ad, family,
3940 3941
						  addrp, len);
	else
3942
		err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET,
3943 3944 3945
				   PACKET__RECV, &ad);
	if (err)
		goto out;
3946

3947
	err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
V
Venkat Yekkirala 已提交
3948 3949 3950
	if (err)
		goto out;

3951
	err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
L
Linus Torvalds 已提交
3952 3953 3954 3955
out:	
	return err;
}

C
Catherine Zhang 已提交
3956 3957
static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
					    int __user *optlen, unsigned len)
L
Linus Torvalds 已提交
3958 3959 3960 3961 3962 3963
{
	int err = 0;
	char *scontext;
	u32 scontext_len;
	struct sk_security_struct *ssec;
	struct inode_security_struct *isec;
3964
	u32 peer_sid = SECSID_NULL;
L
Linus Torvalds 已提交
3965 3966

	isec = SOCK_INODE(sock)->i_security;
C
Catherine Zhang 已提交
3967

3968 3969
	if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
	    isec->sclass == SECCLASS_TCP_SOCKET) {
C
Catherine Zhang 已提交
3970 3971 3972
		ssec = sock->sk->sk_security;
		peer_sid = ssec->peer_sid;
	}
3973
	if (peer_sid == SECSID_NULL) {
L
Linus Torvalds 已提交
3974 3975 3976 3977
		err = -ENOPROTOOPT;
		goto out;
	}

C
Catherine Zhang 已提交
3978 3979
	err = security_sid_to_context(peer_sid, &scontext, &scontext_len);

L
Linus Torvalds 已提交
3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999
	if (err)
		goto out;

	if (scontext_len > len) {
		err = -ERANGE;
		goto out_len;
	}

	if (copy_to_user(optval, scontext, scontext_len))
		err = -EFAULT;

out_len:
	if (put_user(scontext_len, optlen))
		err = -EFAULT;

	kfree(scontext);
out:	
	return err;
}

4000
static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
C
Catherine Zhang 已提交
4001
{
4002
	u32 peer_secid = SECSID_NULL;
4003
	u16 family;
C
Catherine Zhang 已提交
4004

4005 4006 4007 4008 4009 4010 4011 4012
	if (sock)
		family = sock->sk->sk_family;
	else if (skb && skb->sk)
		family = skb->sk->sk_family;
	else
		goto out;

	if (sock && family == PF_UNIX)
4013
		selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
4014
	else if (skb)
4015
		selinux_skb_extlbl_sid(skb, family, &peer_secid);
C
Catherine Zhang 已提交
4016

4017
out:
4018
	*secid = peer_secid;
4019 4020 4021
	if (peer_secid == SECSID_NULL)
		return -EINVAL;
	return 0;
C
Catherine Zhang 已提交
4022 4023
}

A
Al Viro 已提交
4024
static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
L
Linus Torvalds 已提交
4025 4026 4027 4028 4029 4030 4031 4032 4033
{
	return sk_alloc_security(sk, family, priority);
}

static void selinux_sk_free_security(struct sock *sk)
{
	sk_free_security(sk);
}

4034
static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4035
{
4036 4037
	struct sk_security_struct *ssec = sk->sk_security;
	struct sk_security_struct *newssec = newsk->sk_security;
4038

4039 4040
	newssec->sid = ssec->sid;
	newssec->peer_sid = ssec->peer_sid;
4041

P
Paul Moore 已提交
4042
	selinux_netlbl_sk_security_clone(ssec, newssec);
4043 4044
}

V
Venkat Yekkirala 已提交
4045
static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
4046
{
4047
	if (!sk)
V
Venkat Yekkirala 已提交
4048
		*secid = SECINITSID_ANY_SOCKET;
4049 4050
	else {
		struct sk_security_struct *sksec = sk->sk_security;
4051

V
Venkat Yekkirala 已提交
4052
		*secid = sksec->sid;
4053
	}
4054 4055
}

4056
static void selinux_sock_graft(struct sock* sk, struct socket *parent)
4057 4058 4059 4060
{
	struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
	struct sk_security_struct *sksec = sk->sk_security;

4061 4062 4063
	if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
	    sk->sk_family == PF_UNIX)
		isec->sid = sksec->sid;
V
Venkat Yekkirala 已提交
4064 4065

	selinux_netlbl_sock_graft(sk, parent);
4066 4067
}

4068 4069
static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
				     struct request_sock *req)
4070 4071 4072
{
	struct sk_security_struct *sksec = sk->sk_security;
	int err;
V
Venkat Yekkirala 已提交
4073
	u32 newsid;
4074 4075
	u32 peersid;

4076
	selinux_skb_extlbl_sid(skb, sk->sk_family, &peersid);
4077 4078
	if (peersid == SECSID_NULL) {
		req->secid = sksec->sid;
4079
		req->peer_secid = SECSID_NULL;
4080 4081 4082
		return 0;
	}

4083 4084 4085 4086 4087
	err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
	if (err)
		return err;

	req->secid = newsid;
4088
	req->peer_secid = peersid;
4089 4090 4091
	return 0;
}

4092 4093
static void selinux_inet_csk_clone(struct sock *newsk,
				   const struct request_sock *req)
4094 4095 4096 4097
{
	struct sk_security_struct *newsksec = newsk->sk_security;

	newsksec->sid = req->secid;
4098
	newsksec->peer_sid = req->peer_secid;
4099 4100 4101 4102
	/* NOTE: Ideally, we should also get the isec->sid for the
	   new socket in sync, but we don't have the isec available yet.
	   So we will wait until sock_graft to do it, by which
	   time it will have been created and available. */
4103

P
Paul Moore 已提交
4104 4105 4106
	/* We don't need to take any sort of lock here as we are the only
	 * thread with access to newsksec */
	selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
4107 4108
}

4109 4110 4111 4112 4113
static void selinux_inet_conn_established(struct sock *sk,
				struct sk_buff *skb)
{
	struct sk_security_struct *sksec = sk->sk_security;

4114
	selinux_skb_extlbl_sid(skb, sk->sk_family, &sksec->peer_sid);
4115 4116
}

4117 4118
static void selinux_req_classify_flow(const struct request_sock *req,
				      struct flowi *fl)
4119 4120 4121 4122
{
	fl->secid = req->secid;
}

L
Linus Torvalds 已提交
4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134
static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
{
	int err = 0;
	u32 perm;
	struct nlmsghdr *nlh;
	struct socket *sock = sk->sk_socket;
	struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
	
	if (skb->len < NLMSG_SPACE(0)) {
		err = -EINVAL;
		goto out;
	}
4135
	nlh = nlmsg_hdr(skb);
L
Linus Torvalds 已提交
4136 4137 4138 4139
	
	err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
	if (err) {
		if (err == -EINVAL) {
4140
			audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
L
Linus Torvalds 已提交
4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160
				  "SELinux:  unrecognized netlink message"
				  " type=%hu for sclass=%hu\n",
				  nlh->nlmsg_type, isec->sclass);
			if (!selinux_enforcing)
				err = 0;
		}

		/* Ignore */
		if (err == -ENOENT)
			err = 0;
		goto out;
	}

	err = socket_has_perm(current, sock, perm);
out:
	return err;
}

#ifdef CONFIG_NETFILTER

4161 4162 4163
static int selinux_ip_postroute_last_compat(struct sock *sk, struct net_device *dev,
					    struct avc_audit_data *ad,
					    u16 family, char *addrp, int len)
L
Linus Torvalds 已提交
4164
{
4165
	int err = 0;
L
Linus Torvalds 已提交
4166
	u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179
	struct socket *sock;
	struct inode *inode;
	struct inode_security_struct *isec;

	sock = sk->sk_socket;
	if (!sock)
		goto out;

	inode = SOCK_INODE(sock);
	if (!inode)
		goto out;

	isec = inode->i_security;
L
Linus Torvalds 已提交
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196
	
	err = sel_netif_sids(dev, &if_sid, NULL);
	if (err)
		goto out;

	switch (isec->sclass) {
	case SECCLASS_UDP_SOCKET:
		netif_perm = NETIF__UDP_SEND;
		node_perm = NODE__UDP_SEND;
		send_perm = UDP_SOCKET__SEND_MSG;
		break;
	
	case SECCLASS_TCP_SOCKET:
		netif_perm = NETIF__TCP_SEND;
		node_perm = NODE__TCP_SEND;
		send_perm = TCP_SOCKET__SEND_MSG;
		break;
J
James Morris 已提交
4197 4198 4199 4200 4201 4202 4203

	case SECCLASS_DCCP_SOCKET:
		netif_perm = NETIF__DCCP_SEND;
		node_perm = NODE__DCCP_SEND;
		send_perm = DCCP_SOCKET__SEND_MSG;
		break;

L
Linus Torvalds 已提交
4204 4205 4206 4207 4208 4209
	default:
		netif_perm = NETIF__RAWIP_SEND;
		node_perm = NODE__RAWIP_SEND;
		break;
	}

4210 4211
	err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
	if (err)
L
Linus Torvalds 已提交
4212 4213
		goto out;
		
4214 4215
	err = security_node_sid(family, addrp, len, &node_sid);
	if (err)
L
Linus Torvalds 已提交
4216 4217
		goto out;
	
4218 4219
	err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, node_perm, ad);
	if (err)
L
Linus Torvalds 已提交
4220 4221 4222 4223 4224 4225 4226 4227
		goto out;

	if (send_perm) {
		u32 port_sid;
		
		err = security_port_sid(sk->sk_family,
		                        sk->sk_type,
		                        sk->sk_protocol,
4228 4229 4230
		                        ntohs(ad->u.net.dport),
		                        &port_sid);
		if (err)
L
Linus Torvalds 已提交
4231 4232 4233
			goto out;

		err = avc_has_perm(isec->sid, port_sid, isec->sclass,
4234
				   send_perm, ad);
L
Linus Torvalds 已提交
4235
	}
4236 4237 4238 4239 4240
out:
	return err;
}

static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
4241
                                              struct sk_buff *skb,
4242 4243 4244 4245 4246 4247 4248 4249 4250 4251
                                              const struct net_device *in,
                                              const struct net_device *out,
                                              int (*okfn)(struct sk_buff *),
                                              u16 family)
{
	char *addrp;
	int len, err = 0;
	struct sock *sk;
	struct avc_audit_data ad;
	struct net_device *dev = (struct net_device *)out;
4252
	struct sk_security_struct *sksec;
4253
	u8 proto;
L
Linus Torvalds 已提交
4254

4255 4256
	sk = skb->sk;
	if (!sk)
4257 4258
		goto out;

4259
	sksec = sk->sk_security;
4260 4261 4262 4263 4264

	AVC_AUDIT_DATA_INIT(&ad, NET);
	ad.u.net.netif = dev->name;
	ad.u.net.family = family;

4265
	err = selinux_parse_skb(skb, &ad, &addrp, &len, 0, &proto);
4266 4267 4268 4269
	if (err)
		goto out;

	if (selinux_compat_net)
4270
		err = selinux_ip_postroute_last_compat(sk, dev, &ad,
4271 4272
						       family, addrp, len);
	else
4273
		err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET,
4274
				   PACKET__SEND, &ad);
4275

4276 4277 4278
	if (err)
		goto out;

4279
	err = selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto);
L
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4280
out:
4281
	return err ? NF_DROP : NF_ACCEPT;
L
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4282 4283 4284
}

static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
4285
						struct sk_buff *skb,
L
Linus Torvalds 已提交
4286 4287 4288 4289
						const struct net_device *in,
						const struct net_device *out,
						int (*okfn)(struct sk_buff *))
{
4290
	return selinux_ip_postroute_last(hooknum, skb, in, out, okfn, PF_INET);
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}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum,
4296
						struct sk_buff *skb,
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						const struct net_device *in,
						const struct net_device *out,
						int (*okfn)(struct sk_buff *))
{
4301
	return selinux_ip_postroute_last(hooknum, skb, in, out, okfn, PF_INET6);
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}

#endif	/* IPV6 */

#endif	/* CONFIG_NETFILTER */

static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
{
	int err;

	err = secondary_ops->netlink_send(sk, skb);
	if (err)
		return err;

	if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
		err = selinux_nlmsg_perm(sk, skb);

	return err;
}

4322
static int selinux_netlink_recv(struct sk_buff *skb, int capability)
L
Linus Torvalds 已提交
4323
{
4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335
	int err;
	struct avc_audit_data ad;

	err = secondary_ops->netlink_recv(skb, capability);
	if (err)
		return err;

	AVC_AUDIT_DATA_INIT(&ad, CAP);
	ad.u.cap = capability;

	return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
	                    SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
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}

static int ipc_alloc_security(struct task_struct *task,
			      struct kern_ipc_perm *perm,
			      u16 sclass)
{
	struct task_security_struct *tsec = task->security;
	struct ipc_security_struct *isec;

J
James Morris 已提交
4345
	isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
L
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	if (!isec)
		return -ENOMEM;

	isec->sclass = sclass;
	isec->ipc_perm = perm;
4351
	isec->sid = tsec->sid;
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	perm->security = isec;

	return 0;
}

static void ipc_free_security(struct kern_ipc_perm *perm)
{
	struct ipc_security_struct *isec = perm->security;
	perm->security = NULL;
	kfree(isec);
}

static int msg_msg_alloc_security(struct msg_msg *msg)
{
	struct msg_security_struct *msec;

J
James Morris 已提交
4368
	msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
L
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	if (!msec)
		return -ENOMEM;

	msec->msg = msg;
	msec->sid = SECINITSID_UNLABELED;
	msg->security = msec;

	return 0;
}

static void msg_msg_free_security(struct msg_msg *msg)
{
	struct msg_security_struct *msec = msg->security;

	msg->security = NULL;
	kfree(msec);
}

static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
4388
			u32 perms)
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{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;

	tsec = current->security;
	isec = ipc_perms->security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
	ad.u.ipc_id = ipc_perms->key;

4400
	return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
L
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4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484
}

static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
{
	return msg_msg_alloc_security(msg);
}

static void selinux_msg_msg_free_security(struct msg_msg *msg)
{
	msg_msg_free_security(msg);
}

/* message queue security operations */
static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;
	int rc;

	rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
	if (rc)
		return rc;

	tsec = current->security;
	isec = msq->q_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
 	ad.u.ipc_id = msq->q_perm.key;

	rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__CREATE, &ad);
	if (rc) {
		ipc_free_security(&msq->q_perm);
		return rc;
	}
	return 0;
}

static void selinux_msg_queue_free_security(struct msg_queue *msq)
{
	ipc_free_security(&msq->q_perm);
}

static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;

	tsec = current->security;
	isec = msq->q_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
	ad.u.ipc_id = msq->q_perm.key;

	return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
			    MSGQ__ASSOCIATE, &ad);
}

static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
{
	int err;
	int perms;

	switch(cmd) {
	case IPC_INFO:
	case MSG_INFO:
		/* No specific object, just general system-wide information. */
		return task_has_system(current, SYSTEM__IPC_INFO);
	case IPC_STAT:
	case MSG_STAT:
		perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
		break;
	case IPC_SET:
		perms = MSGQ__SETATTR;
		break;
	case IPC_RMID:
		perms = MSGQ__DESTROY;
		break;
	default:
		return 0;
	}

4485
	err = ipc_has_perm(&msq->q_perm, perms);
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4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636
	return err;
}

static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct avc_audit_data ad;
	int rc;

	tsec = current->security;
	isec = msq->q_perm.security;
	msec = msg->security;

	/*
	 * First time through, need to assign label to the message
	 */
	if (msec->sid == SECINITSID_UNLABELED) {
		/*
		 * Compute new sid based on current process and
		 * message queue this message will be stored in
		 */
		rc = security_transition_sid(tsec->sid,
					     isec->sid,
					     SECCLASS_MSG,
					     &msec->sid);
		if (rc)
			return rc;
	}

	AVC_AUDIT_DATA_INIT(&ad, IPC);
	ad.u.ipc_id = msq->q_perm.key;

	/* Can this process write to the queue? */
	rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__WRITE, &ad);
	if (!rc)
		/* Can this process send the message */
		rc = avc_has_perm(tsec->sid, msec->sid,
				  SECCLASS_MSG, MSG__SEND, &ad);
	if (!rc)
		/* Can the message be put in the queue? */
		rc = avc_has_perm(msec->sid, isec->sid,
				  SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);

	return rc;
}

static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
				    struct task_struct *target,
				    long type, int mode)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct avc_audit_data ad;
	int rc;

	tsec = target->security;
	isec = msq->q_perm.security;
	msec = msg->security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
 	ad.u.ipc_id = msq->q_perm.key;

	rc = avc_has_perm(tsec->sid, isec->sid,
			  SECCLASS_MSGQ, MSGQ__READ, &ad);
	if (!rc)
		rc = avc_has_perm(tsec->sid, msec->sid,
				  SECCLASS_MSG, MSG__RECEIVE, &ad);
	return rc;
}

/* Shared Memory security operations */
static int selinux_shm_alloc_security(struct shmid_kernel *shp)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;
	int rc;

	rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
	if (rc)
		return rc;

	tsec = current->security;
	isec = shp->shm_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
 	ad.u.ipc_id = shp->shm_perm.key;

	rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
			  SHM__CREATE, &ad);
	if (rc) {
		ipc_free_security(&shp->shm_perm);
		return rc;
	}
	return 0;
}

static void selinux_shm_free_security(struct shmid_kernel *shp)
{
	ipc_free_security(&shp->shm_perm);
}

static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;

	tsec = current->security;
	isec = shp->shm_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
	ad.u.ipc_id = shp->shm_perm.key;

	return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
			    SHM__ASSOCIATE, &ad);
}

/* Note, at this point, shp is locked down */
static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
{
	int perms;
	int err;

	switch(cmd) {
	case IPC_INFO:
	case SHM_INFO:
		/* No specific object, just general system-wide information. */
		return task_has_system(current, SYSTEM__IPC_INFO);
	case IPC_STAT:
	case SHM_STAT:
		perms = SHM__GETATTR | SHM__ASSOCIATE;
		break;
	case IPC_SET:
		perms = SHM__SETATTR;
		break;
	case SHM_LOCK:
	case SHM_UNLOCK:
		perms = SHM__LOCK;
		break;
	case IPC_RMID:
		perms = SHM__DESTROY;
		break;
	default:
		return 0;
	}

4637
	err = ipc_has_perm(&shp->shm_perm, perms);
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4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655
	return err;
}

static int selinux_shm_shmat(struct shmid_kernel *shp,
			     char __user *shmaddr, int shmflg)
{
	u32 perms;
	int rc;

	rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
	if (rc)
		return rc;

	if (shmflg & SHM_RDONLY)
		perms = SHM__READ;
	else
		perms = SHM__READ | SHM__WRITE;

4656
	return ipc_has_perm(&shp->shm_perm, perms);
L
Linus Torvalds 已提交
4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744
}

/* Semaphore security operations */
static int selinux_sem_alloc_security(struct sem_array *sma)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;
	int rc;

	rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
	if (rc)
		return rc;

	tsec = current->security;
	isec = sma->sem_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
 	ad.u.ipc_id = sma->sem_perm.key;

	rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
			  SEM__CREATE, &ad);
	if (rc) {
		ipc_free_security(&sma->sem_perm);
		return rc;
	}
	return 0;
}

static void selinux_sem_free_security(struct sem_array *sma)
{
	ipc_free_security(&sma->sem_perm);
}

static int selinux_sem_associate(struct sem_array *sma, int semflg)
{
	struct task_security_struct *tsec;
	struct ipc_security_struct *isec;
	struct avc_audit_data ad;

	tsec = current->security;
	isec = sma->sem_perm.security;

	AVC_AUDIT_DATA_INIT(&ad, IPC);
	ad.u.ipc_id = sma->sem_perm.key;

	return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
			    SEM__ASSOCIATE, &ad);
}

/* Note, at this point, sma is locked down */
static int selinux_sem_semctl(struct sem_array *sma, int cmd)
{
	int err;
	u32 perms;

	switch(cmd) {
	case IPC_INFO:
	case SEM_INFO:
		/* No specific object, just general system-wide information. */
		return task_has_system(current, SYSTEM__IPC_INFO);
	case GETPID:
	case GETNCNT:
	case GETZCNT:
		perms = SEM__GETATTR;
		break;
	case GETVAL:
	case GETALL:
		perms = SEM__READ;
		break;
	case SETVAL:
	case SETALL:
		perms = SEM__WRITE;
		break;
	case IPC_RMID:
		perms = SEM__DESTROY;
		break;
	case IPC_SET:
		perms = SEM__SETATTR;
		break;
	case IPC_STAT:
	case SEM_STAT:
		perms = SEM__GETATTR | SEM__ASSOCIATE;
		break;
	default:
		return 0;
	}

4745
	err = ipc_has_perm(&sma->sem_perm, perms);
L
Linus Torvalds 已提交
4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758
	return err;
}

static int selinux_sem_semop(struct sem_array *sma,
			     struct sembuf *sops, unsigned nsops, int alter)
{
	u32 perms;

	if (alter)
		perms = SEM__READ | SEM__WRITE;
	else
		perms = SEM__READ;

4759
	return ipc_has_perm(&sma->sem_perm, perms);
L
Linus Torvalds 已提交
4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774
}

static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
{
	u32 av = 0;

	av = 0;
	if (flag & S_IRUGO)
		av |= IPC__UNIX_READ;
	if (flag & S_IWUGO)
		av |= IPC__UNIX_WRITE;

	if (av == 0)
		return 0;

4775
	return ipc_has_perm(ipcp, av);
L
Linus Torvalds 已提交
4776 4777 4778 4779 4780 4781
}

/* module stacking operations */
static int selinux_register_security (const char *name, struct security_operations *ops)
{
	if (secondary_ops != original_ops) {
4782
		printk(KERN_ERR "%s:  There is already a secondary security "
L
Linus Torvalds 已提交
4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802
		       "module registered.\n", __FUNCTION__);
		return -EINVAL;
 	}

	secondary_ops = ops;

	printk(KERN_INFO "%s:  Registering secondary module %s\n",
	       __FUNCTION__,
	       name);

	return 0;
}

static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode)
{
	if (inode)
		inode_doinit_with_dentry(inode, dentry);
}

static int selinux_getprocattr(struct task_struct *p,
4803
			       char *name, char **value)
L
Linus Torvalds 已提交
4804 4805
{
	struct task_security_struct *tsec;
4806
	u32 sid;
L
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4807
	int error;
4808
	unsigned len;
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	if (current != p) {
		error = task_has_perm(current, p, PROCESS__GETATTR);
		if (error)
			return error;
	}

	tsec = p->security;

	if (!strcmp(name, "current"))
		sid = tsec->sid;
	else if (!strcmp(name, "prev"))
		sid = tsec->osid;
	else if (!strcmp(name, "exec"))
		sid = tsec->exec_sid;
	else if (!strcmp(name, "fscreate"))
		sid = tsec->create_sid;
4826 4827
	else if (!strcmp(name, "keycreate"))
		sid = tsec->keycreate_sid;
4828 4829
	else if (!strcmp(name, "sockcreate"))
		sid = tsec->sockcreate_sid;
L
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4830 4831 4832 4833 4834 4835
	else
		return -EINVAL;

	if (!sid)
		return 0;

4836 4837 4838 4839
	error = security_sid_to_context(sid, value, &len);
	if (error)
		return error;
	return len;
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}

static int selinux_setprocattr(struct task_struct *p,
			       char *name, void *value, size_t size)
{
	struct task_security_struct *tsec;
	u32 sid = 0;
	int error;
	char *str = value;

	if (current != p) {
		/* SELinux only allows a process to change its own
		   security attributes. */
		return -EACCES;
	}

	/*
	 * Basic control over ability to set these attributes at all.
	 * current == p, but we'll pass them separately in case the
	 * above restriction is ever removed.
	 */
	if (!strcmp(name, "exec"))
		error = task_has_perm(current, p, PROCESS__SETEXEC);
	else if (!strcmp(name, "fscreate"))
		error = task_has_perm(current, p, PROCESS__SETFSCREATE);
4865 4866
	else if (!strcmp(name, "keycreate"))
		error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
4867 4868
	else if (!strcmp(name, "sockcreate"))
		error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
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	else if (!strcmp(name, "current"))
		error = task_has_perm(current, p, PROCESS__SETCURRENT);
	else
		error = -EINVAL;
	if (error)
		return error;

	/* Obtain a SID for the context, if one was specified. */
	if (size && str[1] && str[1] != '\n') {
		if (str[size-1] == '\n') {
			str[size-1] = 0;
			size--;
		}
		error = security_context_to_sid(value, size, &sid);
		if (error)
			return error;
	}

	/* Permission checking based on the specified context is
	   performed during the actual operation (execve,
	   open/mkdir/...), when we know the full context of the
	   operation.  See selinux_bprm_set_security for the execve
	   checks and may_create for the file creation checks. The
	   operation will then fail if the context is not permitted. */
	tsec = p->security;
	if (!strcmp(name, "exec"))
		tsec->exec_sid = sid;
	else if (!strcmp(name, "fscreate"))
		tsec->create_sid = sid;
4898 4899 4900 4901 4902
	else if (!strcmp(name, "keycreate")) {
		error = may_create_key(sid, p);
		if (error)
			return error;
		tsec->keycreate_sid = sid;
4903 4904 4905
	} else if (!strcmp(name, "sockcreate"))
		tsec->sockcreate_sid = sid;
	else if (!strcmp(name, "current")) {
L
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4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936
		struct av_decision avd;

		if (sid == 0)
			return -EINVAL;

		/* Only allow single threaded processes to change context */
		if (atomic_read(&p->mm->mm_users) != 1) {
			struct task_struct *g, *t;
			struct mm_struct *mm = p->mm;
			read_lock(&tasklist_lock);
			do_each_thread(g, t)
				if (t->mm == mm && t != p) {
					read_unlock(&tasklist_lock);
					return -EPERM;
				}
			while_each_thread(g, t);
			read_unlock(&tasklist_lock);
                }

		/* Check permissions for the transition. */
		error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
		                     PROCESS__DYNTRANSITION, NULL);
		if (error)
			return error;

		/* Check for ptracing, and update the task SID if ok.
		   Otherwise, leave SID unchanged and fail. */
		task_lock(p);
		if (p->ptrace & PT_PTRACED) {
			error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
						     SECCLASS_PROCESS,
4937
						     PROCESS__PTRACE, 0, &avd);
L
Linus Torvalds 已提交
4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955
			if (!error)
				tsec->sid = sid;
			task_unlock(p);
			avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS,
				  PROCESS__PTRACE, &avd, error, NULL);
			if (error)
				return error;
		} else {
			tsec->sid = sid;
			task_unlock(p);
		}
	}
	else
		return -EINVAL;

	return size;
}

4956 4957 4958 4959 4960
static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
	return security_sid_to_context(secid, secdata, seclen);
}

4961 4962 4963 4964 4965
static int selinux_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
{
	return security_context_to_sid(secdata, seclen, secid);
}

4966 4967
static void selinux_release_secctx(char *secdata, u32 seclen)
{
4968
	kfree(secdata);
4969 4970
}

4971 4972
#ifdef CONFIG_KEYS

4973 4974
static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
			     unsigned long flags)
4975 4976 4977 4978 4979 4980 4981 4982 4983
{
	struct task_security_struct *tsec = tsk->security;
	struct key_security_struct *ksec;

	ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
	if (!ksec)
		return -ENOMEM;

	ksec->obj = k;
4984 4985 4986 4987
	if (tsec->keycreate_sid)
		ksec->sid = tsec->keycreate_sid;
	else
		ksec->sid = tsec->sid;
4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025
	k->security = ksec;

	return 0;
}

static void selinux_key_free(struct key *k)
{
	struct key_security_struct *ksec = k->security;

	k->security = NULL;
	kfree(ksec);
}

static int selinux_key_permission(key_ref_t key_ref,
			    struct task_struct *ctx,
			    key_perm_t perm)
{
	struct key *key;
	struct task_security_struct *tsec;
	struct key_security_struct *ksec;

	key = key_ref_to_ptr(key_ref);

	tsec = ctx->security;
	ksec = key->security;

	/* if no specific permissions are requested, we skip the
	   permission check. No serious, additional covert channels
	   appear to be created. */
	if (perm == 0)
		return 0;

	return avc_has_perm(tsec->sid, ksec->sid,
			    SECCLASS_KEY, perm, NULL);
}

#endif

L
Linus Torvalds 已提交
5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055
static struct security_operations selinux_ops = {
	.ptrace =			selinux_ptrace,
	.capget =			selinux_capget,
	.capset_check =			selinux_capset_check,
	.capset_set =			selinux_capset_set,
	.sysctl =			selinux_sysctl,
	.capable =			selinux_capable,
	.quotactl =			selinux_quotactl,
	.quota_on =			selinux_quota_on,
	.syslog =			selinux_syslog,
	.vm_enough_memory =		selinux_vm_enough_memory,

	.netlink_send =			selinux_netlink_send,
        .netlink_recv =			selinux_netlink_recv,

	.bprm_alloc_security =		selinux_bprm_alloc_security,
	.bprm_free_security =		selinux_bprm_free_security,
	.bprm_apply_creds =		selinux_bprm_apply_creds,
	.bprm_post_apply_creds =	selinux_bprm_post_apply_creds,
	.bprm_set_security =		selinux_bprm_set_security,
	.bprm_check_security =		selinux_bprm_check_security,
	.bprm_secureexec =		selinux_bprm_secureexec,

	.sb_alloc_security =		selinux_sb_alloc_security,
	.sb_free_security =		selinux_sb_free_security,
	.sb_copy_data =			selinux_sb_copy_data,
	.sb_kern_mount =	        selinux_sb_kern_mount,
	.sb_statfs =			selinux_sb_statfs,
	.sb_mount =			selinux_mount,
	.sb_umount =			selinux_umount,
5056 5057 5058
	.sb_get_mnt_opts =		selinux_get_mnt_opts,
	.sb_set_mnt_opts =		selinux_set_mnt_opts,
	.sb_clone_mnt_opts = 		selinux_sb_clone_mnt_opts,
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Linus Torvalds 已提交
5059 5060 5061

	.inode_alloc_security =		selinux_inode_alloc_security,
	.inode_free_security =		selinux_inode_free_security,
5062
	.inode_init_security =		selinux_inode_init_security,
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5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083
	.inode_create =			selinux_inode_create,
	.inode_link =			selinux_inode_link,
	.inode_unlink =			selinux_inode_unlink,
	.inode_symlink =		selinux_inode_symlink,
	.inode_mkdir =			selinux_inode_mkdir,
	.inode_rmdir =			selinux_inode_rmdir,
	.inode_mknod =			selinux_inode_mknod,
	.inode_rename =			selinux_inode_rename,
	.inode_readlink =		selinux_inode_readlink,
	.inode_follow_link =		selinux_inode_follow_link,
	.inode_permission =		selinux_inode_permission,
	.inode_setattr =		selinux_inode_setattr,
	.inode_getattr =		selinux_inode_getattr,
	.inode_setxattr =		selinux_inode_setxattr,
	.inode_post_setxattr =		selinux_inode_post_setxattr,
	.inode_getxattr =		selinux_inode_getxattr,
	.inode_listxattr =		selinux_inode_listxattr,
	.inode_removexattr =		selinux_inode_removexattr,
	.inode_getsecurity =            selinux_inode_getsecurity,
	.inode_setsecurity =            selinux_inode_setsecurity,
	.inode_listsecurity =           selinux_inode_listsecurity,
5084 5085
	.inode_need_killpriv =		selinux_inode_need_killpriv,
	.inode_killpriv =		selinux_inode_killpriv,
L
Linus Torvalds 已提交
5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098

	.file_permission =		selinux_file_permission,
	.file_alloc_security =		selinux_file_alloc_security,
	.file_free_security =		selinux_file_free_security,
	.file_ioctl =			selinux_file_ioctl,
	.file_mmap =			selinux_file_mmap,
	.file_mprotect =		selinux_file_mprotect,
	.file_lock =			selinux_file_lock,
	.file_fcntl =			selinux_file_fcntl,
	.file_set_fowner =		selinux_file_set_fowner,
	.file_send_sigiotask =		selinux_file_send_sigiotask,
	.file_receive =			selinux_file_receive,

5099 5100
	.dentry_open =                  selinux_dentry_open,

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Linus Torvalds 已提交
5101 5102 5103 5104 5105 5106 5107 5108 5109
	.task_create =			selinux_task_create,
	.task_alloc_security =		selinux_task_alloc_security,
	.task_free_security =		selinux_task_free_security,
	.task_setuid =			selinux_task_setuid,
	.task_post_setuid =		selinux_task_post_setuid,
	.task_setgid =			selinux_task_setgid,
	.task_setpgid =			selinux_task_setpgid,
	.task_getpgid =			selinux_task_getpgid,
	.task_getsid =		        selinux_task_getsid,
5110
	.task_getsecid =		selinux_task_getsecid,
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Linus Torvalds 已提交
5111 5112
	.task_setgroups =		selinux_task_setgroups,
	.task_setnice =			selinux_task_setnice,
5113
	.task_setioprio =		selinux_task_setioprio,
5114
	.task_getioprio =		selinux_task_getioprio,
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Linus Torvalds 已提交
5115 5116 5117
	.task_setrlimit =		selinux_task_setrlimit,
	.task_setscheduler =		selinux_task_setscheduler,
	.task_getscheduler =		selinux_task_getscheduler,
5118
	.task_movememory =		selinux_task_movememory,
L
Linus Torvalds 已提交
5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155
	.task_kill =			selinux_task_kill,
	.task_wait =			selinux_task_wait,
	.task_prctl =			selinux_task_prctl,
	.task_reparent_to_init =	selinux_task_reparent_to_init,
	.task_to_inode =                selinux_task_to_inode,

	.ipc_permission =		selinux_ipc_permission,

	.msg_msg_alloc_security =	selinux_msg_msg_alloc_security,
	.msg_msg_free_security =	selinux_msg_msg_free_security,

	.msg_queue_alloc_security =	selinux_msg_queue_alloc_security,
	.msg_queue_free_security =	selinux_msg_queue_free_security,
	.msg_queue_associate =		selinux_msg_queue_associate,
	.msg_queue_msgctl =		selinux_msg_queue_msgctl,
	.msg_queue_msgsnd =		selinux_msg_queue_msgsnd,
	.msg_queue_msgrcv =		selinux_msg_queue_msgrcv,

	.shm_alloc_security =		selinux_shm_alloc_security,
	.shm_free_security =		selinux_shm_free_security,
	.shm_associate =		selinux_shm_associate,
	.shm_shmctl =			selinux_shm_shmctl,
	.shm_shmat =			selinux_shm_shmat,

	.sem_alloc_security = 		selinux_sem_alloc_security,
	.sem_free_security =  		selinux_sem_free_security,
	.sem_associate =		selinux_sem_associate,
	.sem_semctl =			selinux_sem_semctl,
	.sem_semop =			selinux_sem_semop,

	.register_security =		selinux_register_security,

	.d_instantiate =                selinux_d_instantiate,

	.getprocattr =                  selinux_getprocattr,
	.setprocattr =                  selinux_setprocattr,

5156
	.secid_to_secctx =		selinux_secid_to_secctx,
5157
	.secctx_to_secid =		selinux_secctx_to_secid,
5158 5159
	.release_secctx =		selinux_release_secctx,

L
Linus Torvalds 已提交
5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176
        .unix_stream_connect =		selinux_socket_unix_stream_connect,
	.unix_may_send =		selinux_socket_unix_may_send,

	.socket_create =		selinux_socket_create,
	.socket_post_create =		selinux_socket_post_create,
	.socket_bind =			selinux_socket_bind,
	.socket_connect =		selinux_socket_connect,
	.socket_listen =		selinux_socket_listen,
	.socket_accept =		selinux_socket_accept,
	.socket_sendmsg =		selinux_socket_sendmsg,
	.socket_recvmsg =		selinux_socket_recvmsg,
	.socket_getsockname =		selinux_socket_getsockname,
	.socket_getpeername =		selinux_socket_getpeername,
	.socket_getsockopt =		selinux_socket_getsockopt,
	.socket_setsockopt =		selinux_socket_setsockopt,
	.socket_shutdown =		selinux_socket_shutdown,
	.socket_sock_rcv_skb =		selinux_socket_sock_rcv_skb,
C
Catherine Zhang 已提交
5177 5178
	.socket_getpeersec_stream =	selinux_socket_getpeersec_stream,
	.socket_getpeersec_dgram =	selinux_socket_getpeersec_dgram,
L
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5179 5180
	.sk_alloc_security =		selinux_sk_alloc_security,
	.sk_free_security =		selinux_sk_free_security,
5181
	.sk_clone_security =		selinux_sk_clone_security,
V
Venkat Yekkirala 已提交
5182
	.sk_getsecid = 			selinux_sk_getsecid,
5183 5184 5185
	.sock_graft =			selinux_sock_graft,
	.inet_conn_request =		selinux_inet_conn_request,
	.inet_csk_clone =		selinux_inet_csk_clone,
5186
	.inet_conn_established =	selinux_inet_conn_established,
5187
	.req_classify_flow =		selinux_req_classify_flow,
5188 5189 5190 5191 5192

#ifdef CONFIG_SECURITY_NETWORK_XFRM
	.xfrm_policy_alloc_security =	selinux_xfrm_policy_alloc,
	.xfrm_policy_clone_security =	selinux_xfrm_policy_clone,
	.xfrm_policy_free_security =	selinux_xfrm_policy_free,
C
Catherine Zhang 已提交
5193
	.xfrm_policy_delete_security =	selinux_xfrm_policy_delete,
5194 5195
	.xfrm_state_alloc_security =	selinux_xfrm_state_alloc,
	.xfrm_state_free_security =	selinux_xfrm_state_free,
C
Catherine Zhang 已提交
5196
	.xfrm_state_delete_security =	selinux_xfrm_state_delete,
5197
	.xfrm_policy_lookup = 		selinux_xfrm_policy_lookup,
5198 5199
	.xfrm_state_pol_flow_match =	selinux_xfrm_state_pol_flow_match,
	.xfrm_decode_session =		selinux_xfrm_decode_session,
L
Linus Torvalds 已提交
5200
#endif
5201 5202 5203 5204 5205 5206

#ifdef CONFIG_KEYS
	.key_alloc =                    selinux_key_alloc,
	.key_free =                     selinux_key_free,
	.key_permission =               selinux_key_permission,
#endif
L
Linus Torvalds 已提交
5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225
};

static __init int selinux_init(void)
{
	struct task_security_struct *tsec;

	if (!selinux_enabled) {
		printk(KERN_INFO "SELinux:  Disabled at boot.\n");
		return 0;
	}

	printk(KERN_INFO "SELinux:  Initializing.\n");

	/* Set the security state for the initial task. */
	if (task_alloc_security(current))
		panic("SELinux:  Failed to initialize initial task.\n");
	tsec = current->security;
	tsec->osid = tsec->sid = SECINITSID_KERNEL;

5226 5227
	sel_inode_cache = kmem_cache_create("selinux_inode_security",
					    sizeof(struct inode_security_struct),
5228
					    0, SLAB_PANIC, NULL);
L
Linus Torvalds 已提交
5229 5230 5231 5232 5233 5234 5235 5236 5237
	avc_init();

	original_ops = secondary_ops = security_ops;
	if (!secondary_ops)
		panic ("SELinux: No initial security operations\n");
	if (register_security (&selinux_ops))
		panic("SELinux: Unable to register with kernel.\n");

	if (selinux_enforcing) {
5238
		printk(KERN_DEBUG "SELinux:  Starting in enforcing mode\n");
L
Linus Torvalds 已提交
5239
	} else {
5240
		printk(KERN_DEBUG "SELinux:  Starting in permissive mode\n");
L
Linus Torvalds 已提交
5241
	}
5242 5243 5244

#ifdef CONFIG_KEYS
	/* Add security information to initial keyrings */
5245 5246 5247 5248
	selinux_key_alloc(&root_user_keyring, current,
			  KEY_ALLOC_NOT_IN_QUOTA);
	selinux_key_alloc(&root_session_keyring, current,
			  KEY_ALLOC_NOT_IN_QUOTA);
5249 5250
#endif

L
Linus Torvalds 已提交
5251 5252 5253 5254 5255
	return 0;
}

void selinux_complete_init(void)
{
5256
	printk(KERN_DEBUG "SELinux:  Completing initialization.\n");
L
Linus Torvalds 已提交
5257 5258

	/* Set up any superblocks initialized prior to the policy load. */
5259
	printk(KERN_DEBUG "SELinux:  Setting up existing superblocks.\n");
5260
	spin_lock(&sb_lock);
L
Linus Torvalds 已提交
5261 5262 5263 5264 5265 5266 5267 5268 5269 5270
	spin_lock(&sb_security_lock);
next_sb:
	if (!list_empty(&superblock_security_head)) {
		struct superblock_security_struct *sbsec =
				list_entry(superblock_security_head.next,
				           struct superblock_security_struct,
				           list);
		struct super_block *sb = sbsec->sb;
		sb->s_count++;
		spin_unlock(&sb_security_lock);
5271
		spin_unlock(&sb_lock);
L
Linus Torvalds 已提交
5272 5273 5274 5275
		down_read(&sb->s_umount);
		if (sb->s_root)
			superblock_doinit(sb, NULL);
		drop_super(sb);
5276
		spin_lock(&sb_lock);
L
Linus Torvalds 已提交
5277 5278 5279 5280 5281
		spin_lock(&sb_security_lock);
		list_del_init(&sbsec->list);
		goto next_sb;
	}
	spin_unlock(&sb_security_lock);
5282
	spin_unlock(&sb_lock);
L
Linus Torvalds 已提交
5283 5284 5285 5286 5287 5288
}

/* SELinux requires early initialization in order to label
   all processes and objects when they are created. */
security_initcall(selinux_init);

5289
#if defined(CONFIG_NETFILTER)
L
Linus Torvalds 已提交
5290 5291 5292 5293 5294

static struct nf_hook_ops selinux_ipv4_op = {
	.hook =		selinux_ipv4_postroute_last,
	.owner =	THIS_MODULE,
	.pf =		PF_INET,
5295
	.hooknum =	NF_INET_POST_ROUTING,
L
Linus Torvalds 已提交
5296 5297 5298 5299 5300 5301 5302 5303 5304
	.priority =	NF_IP_PRI_SELINUX_LAST,
};

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

static struct nf_hook_ops selinux_ipv6_op = {
	.hook =		selinux_ipv6_postroute_last,
	.owner =	THIS_MODULE,
	.pf =		PF_INET6,
5305
	.hooknum =	NF_INET_POST_ROUTING,
L
Linus Torvalds 已提交
5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316
	.priority =	NF_IP6_PRI_SELINUX_LAST,
};

#endif	/* IPV6 */

static int __init selinux_nf_ip_init(void)
{
	int err = 0;

	if (!selinux_enabled)
		goto out;
5317 5318 5319

	printk(KERN_DEBUG "SELinux:  Registering netfilter hooks\n");

L
Linus Torvalds 已提交
5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330
	err = nf_register_hook(&selinux_ipv4_op);
	if (err)
		panic("SELinux: nf_register_hook for IPv4: error %d\n", err);

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)

	err = nf_register_hook(&selinux_ipv6_op);
	if (err)
		panic("SELinux: nf_register_hook for IPv6: error %d\n", err);

#endif	/* IPV6 */
5331

L
Linus Torvalds 已提交
5332 5333 5334 5335 5336 5337 5338 5339 5340
out:
	return err;
}

__initcall(selinux_nf_ip_init);

#ifdef CONFIG_SECURITY_SELINUX_DISABLE
static void selinux_nf_ip_exit(void)
{
5341
	printk(KERN_DEBUG "SELinux:  Unregistering netfilter hooks\n");
L
Linus Torvalds 已提交
5342 5343 5344 5345 5346 5347 5348 5349

	nf_unregister_hook(&selinux_ipv4_op);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	nf_unregister_hook(&selinux_ipv6_op);
#endif	/* IPV6 */
}
#endif

5350
#else /* CONFIG_NETFILTER */
L
Linus Torvalds 已提交
5351 5352 5353 5354 5355

#ifdef CONFIG_SECURITY_SELINUX_DISABLE
#define selinux_nf_ip_exit()
#endif

5356
#endif /* CONFIG_NETFILTER */
L
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5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376

#ifdef CONFIG_SECURITY_SELINUX_DISABLE
int selinux_disable(void)
{
	extern void exit_sel_fs(void);
	static int selinux_disabled = 0;

	if (ss_initialized) {
		/* Not permitted after initial policy load. */
		return -EINVAL;
	}

	if (selinux_disabled) {
		/* Only do this once. */
		return -EINVAL;
	}

	printk(KERN_INFO "SELinux:  Disabled at runtime.\n");

	selinux_disabled = 1;
5377
	selinux_enabled = 0;
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Linus Torvalds 已提交
5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392

	/* Reset security_ops to the secondary module, dummy or capability. */
	security_ops = secondary_ops;

	/* Unregister netfilter hooks. */
	selinux_nf_ip_exit();

	/* Unregister selinuxfs. */
	exit_sel_fs();

	return 0;
}
#endif