hooks.c 119.3 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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 *
 *	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/module.h>
#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/smp_lock.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>
#include <net/ip.h>		/* for sysctl_local_port_range[] */
#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 "selinux_netlabel.h"
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#define XATTR_SELINUX_SUFFIX "selinux"
#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX

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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#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 kmem_cache_t *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_alloc(sel_inode_cache, SLAB_KERNEL);
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	if (!isec)
		return -ENOMEM;

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	memset(isec, 0, sizeof(*isec));
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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 {
	Opt_context = 1,
	Opt_fscontext = 2,
	Opt_defcontext = 4,
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	Opt_rootcontext = 8,
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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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};

#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 try_context_mount(struct super_block *sb, void *data)
{
	char *context = NULL, *defcontext = NULL;
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	char *fscontext = NULL, *rootcontext = NULL;
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	const char *name;
	u32 sid;
	int alloc = 0, rc = 0, seen = 0;
	struct task_security_struct *tsec = current->security;
	struct superblock_security_struct *sbsec = sb->s_security;

	if (!data)
		goto out;

	name = sb->s_type->name;

	if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {

		/* 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 = d->context;
				seen |= Opt_context;
			}
		} else
			goto out;

	} else {
		/* Standard string-based options. */
		char *p, *options = data;

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		while ((p = strsep(&options, "|")) != NULL) {
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			int token;
			substring_t args[MAX_OPT_ARGS];

			if (!*p)
				continue;

			token = match_token(p, tokens, args);

			switch (token) {
			case Opt_context:
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				if (seen & (Opt_context|Opt_defcontext)) {
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					rc = -EINVAL;
					printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
					goto out_free;
				}
				context = match_strdup(&args[0]);
				if (!context) {
					rc = -ENOMEM;
					goto out_free;
				}
				if (!alloc)
					alloc = 1;
				seen |= Opt_context;
				break;

			case Opt_fscontext:
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				if (seen & Opt_fscontext) {
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					rc = -EINVAL;
					printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
					goto out_free;
				}
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				fscontext = match_strdup(&args[0]);
				if (!fscontext) {
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					rc = -ENOMEM;
					goto out_free;
				}
				if (!alloc)
					alloc = 1;
				seen |= Opt_fscontext;
				break;

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			case Opt_rootcontext:
				if (seen & Opt_rootcontext) {
					rc = -EINVAL;
					printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
					goto out_free;
				}
				rootcontext = match_strdup(&args[0]);
				if (!rootcontext) {
					rc = -ENOMEM;
					goto out_free;
				}
				if (!alloc)
					alloc = 1;
				seen |= Opt_rootcontext;
				break;

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			case Opt_defcontext:
				if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
					rc = -EINVAL;
					printk(KERN_WARNING "SELinux:  "
					       "defcontext option is invalid "
					       "for this filesystem type\n");
					goto out_free;
				}
				if (seen & (Opt_context|Opt_defcontext)) {
					rc = -EINVAL;
					printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
					goto out_free;
				}
				defcontext = match_strdup(&args[0]);
				if (!defcontext) {
					rc = -ENOMEM;
					goto out_free;
				}
				if (!alloc)
					alloc = 1;
				seen |= Opt_defcontext;
				break;

			default:
				rc = -EINVAL;
				printk(KERN_WARNING "SELinux:  unknown mount "
				       "option\n");
				goto out_free;

			}
		}
	}

	if (!seen)
		goto out;

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	/* sets the context of the superblock for the fs being mounted. */
	if (fscontext) {
		rc = security_context_to_sid(fscontext, strlen(fscontext), &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",
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			       fscontext, sb->s_id, name, rc);
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			goto out_free;
		}

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		rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
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		if (rc)
			goto out_free;

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		sbsec->sid = sid;
	}

	/*
	 * 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.
	 */
	if (context) {
		rc = security_context_to_sid(context, strlen(context), &sid);
		if (rc) {
			printk(KERN_WARNING "SELinux: security_context_to_sid"
			       "(%s) failed for (dev %s, type %s) errno=%d\n",
			       context, sb->s_id, name, rc);
			goto out_free;
		}

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		if (!fscontext) {
			rc = may_context_mount_sb_relabel(sid, sbsec, tsec);
			if (rc)
				goto out_free;
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			sbsec->sid = sid;
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		} else {
			rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
			if (rc)
				goto out_free;
		}
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		sbsec->mntpoint_sid = sid;
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		sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
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	}

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	if (rootcontext) {
		struct inode *inode = sb->s_root->d_inode;
		struct inode_security_struct *isec = inode->i_security;
		rc = security_context_to_sid(rootcontext, strlen(rootcontext), &sid);
		if (rc) {
			printk(KERN_WARNING "SELinux: security_context_to_sid"
			       "(%s) failed for (dev %s, type %s) errno=%d\n",
			       rootcontext, sb->s_id, name, rc);
			goto out_free;
		}

		rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
		if (rc)
			goto out_free;

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

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	if (defcontext) {
		rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
		if (rc) {
			printk(KERN_WARNING "SELinux: security_context_to_sid"
			       "(%s) failed for (dev %s, type %s) errno=%d\n",
			       defcontext, sb->s_id, name, rc);
			goto out_free;
		}

		if (sid == sbsec->def_sid)
			goto out_free;

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		rc = may_context_mount_inode_relabel(sid, sbsec, tsec);
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		if (rc)
			goto out_free;

		sbsec->def_sid = sid;
	}

out_free:
	if (alloc) {
		kfree(context);
		kfree(defcontext);
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		kfree(fscontext);
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		kfree(rootcontext);
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	}
out:
	return rc;
}

static int superblock_doinit(struct super_block *sb, void *data)
{
	struct superblock_security_struct *sbsec = sb->s_security;
	struct dentry *root = sb->s_root;
	struct inode *inode = root->d_inode;
	int rc = 0;

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	mutex_lock(&sbsec->lock);
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	if (sbsec->initialized)
		goto out;

	if (!ss_initialized) {
		/* 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;
	}

	/* 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;
	}

	rc = try_context_mount(sb, data);
	if (rc)
		goto out;

	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 (!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 = 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;
		}
	}

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

	sbsec->initialized = 1;

	if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) {
		printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n",
		       sb->s_id, sb->s_type->name);
	}
	else {
		printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n",
		       sb->s_id, sb->s_type->name,
		       labeling_behaviors[sbsec->behavior-1]);
	}

	/* Initialize the root inode. */
	rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root);

	/* 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:
693
	mutex_unlock(&sbsec->lock);
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	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;
}

720 721 722 723 724 725 726 727 728 729
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);
}

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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:
746 747 748 749
			if (default_protocol_stream(protocol))
				return SECCLASS_TCP_SOCKET;
			else
				return SECCLASS_RAWIP_SOCKET;
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		case SOCK_DGRAM:
751 752 753 754
			if (default_protocol_dgram(protocol))
				return SECCLASS_UDP_SOCKET;
			else
				return SECCLASS_RAWIP_SOCKET;
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		case SOCK_DCCP:
			return SECCLASS_DCCP_SOCKET;
757
		default:
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			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;
767
		case NETLINK_INET_DIAG:
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			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;
781 782
		case NETLINK_KOBJECT_UEVENT:
			return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
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		default:
			return SECCLASS_NETLINK_SOCKET;
		}
	case PF_PACKET:
		return SECCLASS_PACKET_SOCKET;
	case PF_KEY:
		return SECCLASS_KEY_SOCKET;
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	case PF_APPLETALK:
		return SECCLASS_APPLETALK_SOCKET;
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	}

	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;

853
	mutex_lock(&isec->lock);
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	if (isec->initialized)
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		goto out_unlock;
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	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);
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		goto out_unlock;
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	}

	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);
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			goto out_unlock;
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		}

		len = INITCONTEXTLEN;
		context = kmalloc(len, GFP_KERNEL);
		if (!context) {
			rc = -ENOMEM;
			dput(dentry);
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			goto out_unlock;
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		}
		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);
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				goto out_unlock;
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			}
			kfree(context);
			len = rc;
			context = kmalloc(len, GFP_KERNEL);
			if (!context) {
				rc = -ENOMEM;
				dput(dentry);
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				goto out_unlock;
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			}
			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);
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				goto out_unlock;
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			}
			/* Map ENODATA to the default file SID */
			sid = sbsec->def_sid;
			rc = 0;
		} else {
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			rc = security_context_to_sid_default(context, rc, &sid,
			                                     sbsec->def_sid);
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			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;

991 992
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;

	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. */
1117
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;
	struct vfsmount *mnt = file->f_vfsmnt;
	struct dentry *dentry = file->f_dentry;
	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);
}

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
/* 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. */
1381
	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);
}

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;

	rc = selinux_proc_get_sid(table->de, (op == 001) ?
	                          SECCLASS_DIR : SECCLASS_FILE, &tsid);
	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.
 */
static int selinux_vm_enough_memory(long pages)
{
	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,
					SECCLASS_CAPABILITY,
					CAP_TO_MASK(CAP_SYS_ADMIN),
					NULL);

	if (rc == 0)
		cap_sys_admin = 1;

	return __vm_enough_memory(pages, cap_sys_admin);
}

/* binprm security operations */

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

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	bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
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	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;
	struct inode *inode = bprm->file->f_dentry->d_inode;
	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;

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	/* Reset fs, key, and sock SIDs on execve. */
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	tsec->create_sid = 0;
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	tsec->keycreate_sid = 0;
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	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);
	ad.u.fs.mnt = bprm->file->f_vfsmnt;
	ad.u.fs.dentry = bprm->file->f_dentry;

	if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
		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)
{
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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;
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	struct tty_struct *tty;
1696
	struct fdtable *fdt;
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	long j = -1;

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	mutex_lock(&tty_mutex);
	tty = current->signal->tty;
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	if (tty) {
		file_list_lock();
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		file = list_entry(tty->tty_files.next, typeof(*file), f_u.fu_list);
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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. */
			struct inode *inode = file->f_dentry->d_inode;
			if (inode_has_perm(current, inode,
					   FILE__READ | FILE__WRITE, NULL)) {
				/* Reset controlling tty. */
				current->signal->tty = NULL;
				current->signal->tty_old_pgrp = 0;
			}
		}
		file_list_unlock();
	}
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	mutex_unlock(&tty_mutex);
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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;
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		fdt = files_fdtable(files);
		if (i >= fdt->max_fds || i >= fdt->max_fdset)
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			break;
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		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) {
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						get_file(devnull);
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					} else {
						devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
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						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);
	}

	/* 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) ||
1921 1922
	        match_prefix("defcontext=", sizeof("defcontext=")-1, option, len) ||
		match_prefix("rootcontext=", sizeof("rootcontext=")-1, option, len));
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}

static inline void take_option(char **to, char *from, int *first, int len)
{
	if (!*first) {
		**to = ',';
		*to += 1;
1930
	} else
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		*first = 0;
	memcpy(*to, from, len);
	*to += len;
}

1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
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;
	}
}

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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;
1963
	int open_quote = 0;
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	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 {
1985 1986 1987 1988
		if (*in_end == '"')
			open_quote = !open_quote;
		if ((*in_end == ',' && open_quote == 0) ||
				*in_end == '\0') {
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			int len = in_end - in_curr;

			if (selinux_option(in_curr, len))
1992
				take_selinux_option(&sec_curr, in_curr, &fsec, len);
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			else
				take_option(&nosec, in_curr, &fnosec, len);

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

2000
	strcpy(in_save, nosec_save);
2001
	free_page((unsigned long)nosec_save);
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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);
}

2020
static int selinux_sb_statfs(struct dentry *dentry)
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{
	struct avc_audit_data ad;

	AVC_AUDIT_DATA_INIT(&ad,FS);
2025 2026
	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);
}

2073 2074 2075 2076 2077 2078 2079
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;
2080
	u32 newsid, clen;
2081
	int rc;
2082
	char *namep = NULL, *context;
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103

	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;
		}
	}

2104 2105 2106 2107 2108 2109 2110
	/* 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;
	}
2111

2112
	if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2113 2114
		return -EOPNOTSUPP;

2115 2116 2117 2118 2119 2120
	if (name) {
		namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
		if (!namep)
			return -ENOMEM;
		*name = namep;
	}
2121

2122 2123 2124 2125 2126 2127 2128 2129
	if (value && len) {
		rc = security_sid_to_context(newsid, &context, &clen);
		if (rc) {
			kfree(namep);
			return rc;
		}
		*value = context;
		*len = clen;
2130 2131 2132 2133 2134
	}

	return 0;
}

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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);
}

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;

	if (strcmp(name, XATTR_NAME_SELINUX)) {
		if (!strncmp(name, XATTR_SECURITY_PREFIX,
			     sizeof XATTR_SECURITY_PREFIX - 1) &&
		    !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);
	}

	sbsec = inode->i_sb->s_security;
	if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
		return -EOPNOTSUPP;

	if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
		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)
{
	if (strcmp(name, XATTR_NAME_SELINUX)) {
		if (!strncmp(name, XATTR_SECURITY_PREFIX,
			     sizeof XATTR_SECURITY_PREFIX - 1) &&
		    !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. Might want a separate
		   permission for removexattr. */
		return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
	}

	/* No one is allowed to remove a SELinux security label.
	   You can change the label, but all data must be labeled. */
	return -EACCES;
}

2364 2365 2366 2367 2368
static const char *selinux_inode_xattr_getsuffix(void)
{
      return XATTR_SELINUX_SUFFIX;
}

2369 2370 2371 2372 2373 2374 2375
/*
 * 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.
 */
2376
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;
2379

2380 2381
	if (strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;
2382

2383
	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;
}

/* file security operations */

static int selinux_file_permission(struct file *file, int mask)
{
V
Venkat Yekkirala 已提交
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	int rc;
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Linus Torvalds 已提交
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	struct inode *inode = file->f_dentry->d_inode;

	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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Venkat Yekkirala 已提交
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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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}

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,
			     unsigned long prot, unsigned long flags)
{
	int rc;

	rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
	if (rc)
		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
2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
	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);
		}
2577 2578 2579
		if (rc)
			return rc;
	}
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2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
#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:
			if (!file->f_dentry || !file->f_dentry->d_inode) {
				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
			if (!file->f_dentry || !file->f_dentry->d_inode) {
				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 */
        file = (struct file *)((long)fown - offsetof(struct file,f_owner));

	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));
}

/* 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;

2702
	/* Retain the exec, fs, key, and sock SIDs across fork */
L
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2703 2704
	tsec2->exec_sid = tsec1->exec_sid;
	tsec2->create_sid = tsec1->create_sid;
2705
	tsec2->keycreate_sid = tsec1->keycreate_sid;
2706
	tsec2->sockcreate_sid = tsec1->sockcreate_sid;
L
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2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757

	/* 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);
}

2758 2759 2760 2761 2762
static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
{
	selinux_get_task_sid(p, secid);
}

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2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
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);
}

2780 2781 2782 2783 2784
static int selinux_task_setioprio(struct task_struct *p, int ioprio)
{
	return task_has_perm(current, p, PROCESS__SETSCHED);
}

2785 2786 2787 2788 2789
static int selinux_task_getioprio(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__GETSCHED);
}

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2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
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)
{
	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);
}

2819 2820 2821 2822 2823
static int selinux_task_movememory(struct task_struct *p)
{
	return task_has_perm(current, p, PROCESS__SETSCHED);
}

2824 2825
static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
				int sig, u32 secid)
L
Linus Torvalds 已提交
2826 2827 2828
{
	u32 perm;
	int rc;
2829
	struct task_security_struct *tsec;
L
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2830

2831
	rc = secondary_ops->task_kill(p, info, sig, secid);
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2832 2833 2834
	if (rc)
		return rc;

2835
	if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
L
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2836 2837 2838 2839 2840 2841
		return 0;

	if (!sig)
		perm = PROCESS__SIGNULL; /* null signal; existence test */
	else
		perm = signal_to_av(sig);
2842 2843 2844 2845 2846 2847
	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;
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2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
}

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)
{
	u32 perm;

	perm = signal_to_av(p->exit_signal);

	return task_has_perm(p, current, perm);
}

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 */
2895 2896
static int selinux_parse_skb_ipv4(struct sk_buff *skb,
			struct avc_audit_data *ad, u8 *proto)
L
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2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
{
	int offset, ihlen, ret = -EINVAL;
	struct iphdr _iph, *ih;

	offset = skb->nh.raw - skb->data;
	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;

2914 2915 2916
	if (proto)
		*proto = ih->protocol;

L
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2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949
	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
2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
	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;
        }

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2966 2967 2968 2969 2970 2971 2972 2973 2974 2975
        default:
        	break;
        }
out:
	return ret;
}

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

/* Returns error only if unable to parse addresses */
2976 2977
static int selinux_parse_skb_ipv6(struct sk_buff *skb,
			struct avc_audit_data *ad, u8 *proto)
L
Linus Torvalds 已提交
2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
{
	u8 nexthdr;
	int ret = -EINVAL, offset;
	struct ipv6hdr _ipv6h, *ip6;

	offset = skb->nh.raw - skb->data;
	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);
2994
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
L
Linus Torvalds 已提交
2995 2996 2997
	if (offset < 0)
		goto out;

2998 2999 3000
	if (proto)
		*proto = nexthdr;

L
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3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025
	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
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037
	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
3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
	/* includes fragments */
	default:
		break;
	}
out:
	return ret;
}

#endif /* IPV6 */

static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
3049
			     char **addrp, int *len, int src, u8 *proto)
L
Linus Torvalds 已提交
3050 3051 3052 3053 3054
{
	int ret = 0;

	switch (ad->u.net.family) {
	case PF_INET:
3055
		ret = selinux_parse_skb_ipv4(skb, ad, proto);
L
Linus Torvalds 已提交
3056 3057 3058 3059 3060 3061 3062 3063 3064
		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:
3065
		ret = selinux_parse_skb_ipv6(skb, ad, proto);
L
Linus Torvalds 已提交
3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107
		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;
}

/* 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;
3108
	u32 newsid;
L
Linus Torvalds 已提交
3109 3110 3111 3112 3113

	if (kern)
		goto out;

	tsec = current->security;
3114 3115
	newsid = tsec->sockcreate_sid ? : tsec->sid;
	err = avc_has_perm(tsec->sid, newsid,
L
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3116 3117 3118 3119 3120 3121 3122
			   socket_type_to_security_class(family, type,
			   protocol), SOCKET__CREATE, NULL);

out:
	return err;
}

V
Venkat Yekkirala 已提交
3123 3124
static int selinux_socket_post_create(struct socket *sock, int family,
				      int type, int protocol, int kern)
L
Linus Torvalds 已提交
3125
{
V
Venkat Yekkirala 已提交
3126
	int err = 0;
L
Linus Torvalds 已提交
3127 3128
	struct inode_security_struct *isec;
	struct task_security_struct *tsec;
3129
	struct sk_security_struct *sksec;
3130
	u32 newsid;
L
Linus Torvalds 已提交
3131 3132 3133 3134

	isec = SOCK_INODE(sock)->i_security;

	tsec = current->security;
3135
	newsid = tsec->sockcreate_sid ? : tsec->sid;
L
Linus Torvalds 已提交
3136
	isec->sclass = socket_type_to_security_class(family, type, protocol);
3137
	isec->sid = kern ? SECINITSID_KERNEL : newsid;
L
Linus Torvalds 已提交
3138 3139
	isec->initialized = 1;

3140 3141 3142
	if (sock->sk) {
		sksec = sock->sk->sk_security;
		sksec->sid = isec->sid;
P
Paul Moore 已提交
3143
		err = selinux_netlbl_socket_post_create(sock);
3144 3145
	}

V
Venkat Yekkirala 已提交
3146
	return err;
L
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3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
}

/* 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. */
#define ip_local_port_range_0 sysctl_local_port_range[0]
#define ip_local_port_range_1 sysctl_local_port_range[1]

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.
3166 3167
	 * Multiple address binding for SCTP is not supported yet: we just
	 * check the first address now.
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	 */
	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;
		}

		if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) ||
			   snum > ip_local_port_range_1)) {
			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;
		}
		
3212 3213
		switch(isec->sclass) {
		case SECCLASS_TCP_SOCKET:
L
Linus Torvalds 已提交
3214 3215 3216
			node_perm = TCP_SOCKET__NODE_BIND;
			break;
			
3217
		case SECCLASS_UDP_SOCKET:
L
Linus Torvalds 已提交
3218 3219
			node_perm = UDP_SOCKET__NODE_BIND;
			break;
J
James Morris 已提交
3220 3221 3222 3223 3224

		case SECCLASS_DCCP_SOCKET:
			node_perm = DCCP_SOCKET__NODE_BIND;
			break;

L
Linus Torvalds 已提交
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
		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
3262
	 * If a TCP or DCCP socket, check name_connect permission for the port.
L
Linus Torvalds 已提交
3263 3264
	 */
	isec = SOCK_INODE(sock)->i_security;
J
James Morris 已提交
3265 3266
	if (isec->sclass == SECCLASS_TCP_SOCKET ||
	    isec->sclass == SECCLASS_DCCP_SOCKET) {
L
Linus Torvalds 已提交
3267 3268 3269 3270 3271
		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
3272
		u32 sid, perm;
L
Linus Torvalds 已提交
3273 3274 3275

		if (sk->sk_family == PF_INET) {
			addr4 = (struct sockaddr_in *)address;
3276
			if (addrlen < sizeof(struct sockaddr_in))
L
Linus Torvalds 已提交
3277 3278 3279 3280
				return -EINVAL;
			snum = ntohs(addr4->sin_port);
		} else {
			addr6 = (struct sockaddr_in6 *)address;
3281
			if (addrlen < SIN6_LEN_RFC2133)
L
Linus Torvalds 已提交
3282 3283 3284 3285 3286 3287 3288 3289 3290
				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
3291 3292 3293
		perm = (isec->sclass == SECCLASS_TCP_SOCKET) ?
		       TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;

L
Linus Torvalds 已提交
3294 3295 3296
		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
3297
		err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad);
L
Linus Torvalds 已提交
3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333
		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
3334 3335 3336 3337 3338 3339 3340
	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
3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360
}

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)
{
3361 3362 3363 3364 3365 3366 3367
	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
3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413
}

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;
3414 3415 3416
	err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid);

	return err;
L
Linus Torvalds 已提交
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440
}

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;
}

3441
static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
3442
		struct avc_audit_data *ad, u16 family, char *addrp, int len)
L
Linus Torvalds 已提交
3443
{
3444
	int err = 0;
L
Linus Torvalds 已提交
3445
	u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464
	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
3465

3466
	if (!skb->dev)
L
Linus Torvalds 已提交
3467 3468
		goto out;

3469
	err = sel_netif_sids(skb->dev, &if_sid, NULL);
L
Linus Torvalds 已提交
3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484
	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
3485 3486 3487 3488 3489 3490 3491

	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
3492 3493 3494 3495 3496 3497
	default:
		netif_perm = NETIF__RAWIP_RECV;
		node_perm = NODE__RAWIP_RECV;
		break;
	}

3498
	err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
L
Linus Torvalds 已提交
3499 3500 3501 3502 3503 3504 3505
	if (err)
		goto out;
	
	err = security_node_sid(family, addrp, len, &node_sid);
	if (err)
		goto out;
	
3506
	err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, ad);
L
Linus Torvalds 已提交
3507 3508 3509 3510 3511 3512 3513
	if (err)
		goto out;

	if (recv_perm) {
		u32 port_sid;

		err = security_port_sid(sk->sk_family, sk->sk_type,
3514
		                        sk->sk_protocol, ntohs(ad->u.net.sport),
L
Linus Torvalds 已提交
3515 3516 3517 3518 3519
		                        &port_sid);
		if (err)
			goto out;

		err = avc_has_perm(sock_sid, port_sid,
3520
				   sock_class, recv_perm, ad);
L
Linus Torvalds 已提交
3521
	}
3522

3523 3524 3525 3526 3527 3528 3529 3530 3531 3532
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;
3533
	struct sk_security_struct *sksec = sk->sk_security;
3534 3535 3536 3537 3538 3539

	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
3540
	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
3541 3542 3543 3544 3545 3546
		family = PF_INET;

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

3547
	err = selinux_parse_skb(skb, &ad, &addrp, &len, 1, NULL);
3548 3549 3550 3551
	if (err)
		goto out;

	if (selinux_compat_net)
3552
		err = selinux_sock_rcv_skb_compat(sk, skb, &ad, family,
3553 3554
						  addrp, len);
	else
3555
		err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET,
3556 3557 3558
				   PACKET__RECV, &ad);
	if (err)
		goto out;
3559

V
Venkat Yekkirala 已提交
3560 3561 3562 3563
	err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad);
	if (err)
		goto out;

3564
	err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
L
Linus Torvalds 已提交
3565 3566 3567 3568
out:	
	return err;
}

C
Catherine Zhang 已提交
3569 3570
static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
					    int __user *optlen, unsigned len)
L
Linus Torvalds 已提交
3571 3572 3573 3574 3575 3576
{
	int err = 0;
	char *scontext;
	u32 scontext_len;
	struct sk_security_struct *ssec;
	struct inode_security_struct *isec;
3577
	u32 peer_sid = SECSID_NULL;
L
Linus Torvalds 已提交
3578 3579

	isec = SOCK_INODE(sock)->i_security;
C
Catherine Zhang 已提交
3580

3581 3582
	if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
	    isec->sclass == SECCLASS_TCP_SOCKET) {
C
Catherine Zhang 已提交
3583 3584 3585
		ssec = sock->sk->sk_security;
		peer_sid = ssec->peer_sid;
	}
3586
	if (peer_sid == SECSID_NULL) {
L
Linus Torvalds 已提交
3587 3588 3589 3590
		err = -ENOPROTOOPT;
		goto out;
	}

C
Catherine Zhang 已提交
3591 3592
	err = security_sid_to_context(peer_sid, &scontext, &scontext_len);

L
Linus Torvalds 已提交
3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612
	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;
}

3613
static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
C
Catherine Zhang 已提交
3614
{
3615
	u32 peer_secid = SECSID_NULL;
C
Catherine Zhang 已提交
3616
	int err = 0;
C
Catherine Zhang 已提交
3617

3618
	if (sock && sock->sk->sk_family == PF_UNIX)
3619
		selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
3620 3621 3622 3623
	else if (skb)
		security_skb_extlbl_sid(skb,
					SECINITSID_UNLABELED,
					&peer_secid);
C
Catherine Zhang 已提交
3624

3625 3626 3627
	if (peer_secid == SECSID_NULL)
		err = -EINVAL;
	*secid = peer_secid;
C
Catherine Zhang 已提交
3628

3629
	return err;
C
Catherine Zhang 已提交
3630 3631
}

A
Al Viro 已提交
3632
static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
L
Linus Torvalds 已提交
3633 3634 3635 3636 3637 3638 3639 3640 3641
{
	return sk_alloc_security(sk, family, priority);
}

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

3642
static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
3643
{
3644 3645
	struct sk_security_struct *ssec = sk->sk_security;
	struct sk_security_struct *newssec = newsk->sk_security;
3646

3647 3648
	newssec->sid = ssec->sid;
	newssec->peer_sid = ssec->peer_sid;
3649

P
Paul Moore 已提交
3650
	selinux_netlbl_sk_security_clone(ssec, newssec);
3651 3652
}

V
Venkat Yekkirala 已提交
3653
static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
3654
{
3655
	if (!sk)
V
Venkat Yekkirala 已提交
3656
		*secid = SECINITSID_ANY_SOCKET;
3657 3658
	else {
		struct sk_security_struct *sksec = sk->sk_security;
3659

V
Venkat Yekkirala 已提交
3660
		*secid = sksec->sid;
3661
	}
3662 3663
}

3664
static void selinux_sock_graft(struct sock* sk, struct socket *parent)
3665 3666 3667 3668
{
	struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
	struct sk_security_struct *sksec = sk->sk_security;

3669 3670 3671
	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
3672 3673

	selinux_netlbl_sock_graft(sk, parent);
3674 3675
}

3676 3677
static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
				     struct request_sock *req)
3678 3679 3680
{
	struct sk_security_struct *sksec = sk->sk_security;
	int err;
V
Venkat Yekkirala 已提交
3681
	u32 newsid;
3682 3683
	u32 peersid;

3684
	security_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &peersid);
3685 3686
	if (peersid == SECSID_NULL) {
		req->secid = sksec->sid;
3687
		req->peer_secid = SECSID_NULL;
3688 3689 3690
		return 0;
	}

3691 3692 3693 3694 3695
	err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
	if (err)
		return err;

	req->secid = newsid;
3696
	req->peer_secid = peersid;
3697 3698 3699
	return 0;
}

3700 3701
static void selinux_inet_csk_clone(struct sock *newsk,
				   const struct request_sock *req)
3702 3703 3704 3705
{
	struct sk_security_struct *newsksec = newsk->sk_security;

	newsksec->sid = req->secid;
3706
	newsksec->peer_sid = req->peer_secid;
3707 3708 3709 3710
	/* 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. */
3711

P
Paul Moore 已提交
3712 3713 3714
	/* 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);
3715 3716
}

3717 3718 3719 3720 3721
static void selinux_inet_conn_established(struct sock *sk,
				struct sk_buff *skb)
{
	struct sk_security_struct *sksec = sk->sk_security;

3722
	security_skb_extlbl_sid(skb, SECINITSID_UNLABELED, &sksec->peer_sid);
3723 3724
}

3725 3726
static void selinux_req_classify_flow(const struct request_sock *req,
				      struct flowi *fl)
3727 3728 3729 3730
{
	fl->secid = req->secid;
}

L
Linus Torvalds 已提交
3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747
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;
	}
	nlh = (struct nlmsghdr *)skb->data;
	
	err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
	if (err) {
		if (err == -EINVAL) {
3748
			audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
L
Linus Torvalds 已提交
3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768
				  "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

3769 3770 3771
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
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{
3773
	int err = 0;
L
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3774
	u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787
	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;
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3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804
	
	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;
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	case SECCLASS_DCCP_SOCKET:
		netif_perm = NETIF__DCCP_SEND;
		node_perm = NODE__DCCP_SEND;
		send_perm = DCCP_SOCKET__SEND_MSG;
		break;

L
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	default:
		netif_perm = NETIF__RAWIP_SEND;
		node_perm = NODE__RAWIP_SEND;
		break;
	}

3818 3819
	err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
	if (err)
L
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		goto out;
		
3822 3823
	err = security_node_sid(family, addrp, len, &node_sid);
	if (err)
L
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		goto out;
	
3826 3827
	err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE, node_perm, ad);
	if (err)
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		goto out;

	if (send_perm) {
		u32 port_sid;
		
		err = security_port_sid(sk->sk_family,
		                        sk->sk_type,
		                        sk->sk_protocol,
3836 3837 3838
		                        ntohs(ad->u.net.dport),
		                        &port_sid);
		if (err)
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			goto out;

		err = avc_has_perm(isec->sid, port_sid, isec->sclass,
3842
				   send_perm, ad);
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	}
3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
out:
	return err;
}

static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
                                              struct sk_buff **pskb,
                                              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 sk_buff *skb = *pskb;
	struct avc_audit_data ad;
	struct net_device *dev = (struct net_device *)out;
3861
	struct sk_security_struct *sksec;
3862
	u8 proto;
L
Linus Torvalds 已提交
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3864 3865
	sk = skb->sk;
	if (!sk)
3866 3867
		goto out;

3868
	sksec = sk->sk_security;
3869 3870 3871 3872 3873

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

3874
	err = selinux_parse_skb(skb, &ad, &addrp, &len, 0, &proto);
3875 3876 3877 3878
	if (err)
		goto out;

	if (selinux_compat_net)
3879
		err = selinux_ip_postroute_last_compat(sk, dev, &ad,
3880 3881
						       family, addrp, len);
	else
3882
		err = avc_has_perm(sksec->sid, skb->secmark, SECCLASS_PACKET,
3883
				   PACKET__SEND, &ad);
3884

3885 3886 3887
	if (err)
		goto out;

3888
	err = selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto);
L
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out:
3890
	return err ? NF_DROP : NF_ACCEPT;
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}

static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
						struct sk_buff **pskb,
						const struct net_device *in,
						const struct net_device *out,
						int (*okfn)(struct sk_buff *))
{
	return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET);
}

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

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

#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;
}

3931
static int selinux_netlink_recv(struct sk_buff *skb, int capability)
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{
3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944
	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
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	isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
L
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3955 3956 3957 3958 3959
	if (!isec)
		return -ENOMEM;

	isec->sclass = sclass;
	isec->ipc_perm = perm;
3960
	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
3977
	msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
L
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3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996
	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,
3997
			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;

4009
	return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
L
Linus Torvalds 已提交
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}

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;
	}

4094
	err = ipc_has_perm(&msq->q_perm, perms);
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4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245
	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;
	}

4246
	err = ipc_has_perm(&shp->shm_perm, perms);
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Linus Torvalds 已提交
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	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;

4265
	return ipc_has_perm(&shp->shm_perm, perms);
L
Linus Torvalds 已提交
4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353
}

/* 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;
	}

4354
	err = ipc_has_perm(&sma->sem_perm, perms);
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4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367
	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;

4368
	return ipc_has_perm(&sma->sem_perm, perms);
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}

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;

4384
	return ipc_has_perm(ipcp, av);
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Linus Torvalds 已提交
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}

/* module stacking operations */
static int selinux_register_security (const char *name, struct security_operations *ops)
{
	if (secondary_ops != original_ops) {
		printk(KERN_INFO "%s:  There is already a secondary security "
		       "module registered.\n", __FUNCTION__);
		return -EINVAL;
 	}

	secondary_ops = ops;

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

	return 0;
}

static int selinux_unregister_security (const char *name, struct security_operations *ops)
{
	if (ops != secondary_ops) {
		printk (KERN_INFO "%s:  trying to unregister a security module "
		        "that is not registered.\n", __FUNCTION__);
		return -EINVAL;
	}

	secondary_ops = original_ops;

	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,
			       char *name, void *value, size_t size)
{
	struct task_security_struct *tsec;
4428
	u32 sid;
L
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4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446
	int error;

	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;
4447 4448
	else if (!strcmp(name, "keycreate"))
		sid = tsec->keycreate_sid;
4449 4450
	else if (!strcmp(name, "sockcreate"))
		sid = tsec->sockcreate_sid;
L
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4451 4452 4453 4454 4455 4456
	else
		return -EINVAL;

	if (!sid)
		return 0;

4457
	return selinux_getsecurity(sid, value, size);
L
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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
}

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);
4483 4484
	else if (!strcmp(name, "keycreate"))
		error = task_has_perm(current, p, PROCESS__SETKEYCREATE);
4485 4486
	else if (!strcmp(name, "sockcreate"))
		error = task_has_perm(current, p, PROCESS__SETSOCKCREATE);
L
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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
	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;
4516 4517 4518 4519 4520
	else if (!strcmp(name, "keycreate")) {
		error = may_create_key(sid, p);
		if (error)
			return error;
		tsec->keycreate_sid = sid;
4521 4522 4523
	} else if (!strcmp(name, "sockcreate"))
		tsec->sockcreate_sid = sid;
	else if (!strcmp(name, "current")) {
L
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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
		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,
						     PROCESS__PTRACE, &avd);
			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;
}

4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584
static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
	return security_sid_to_context(secid, secdata, seclen);
}

static void selinux_release_secctx(char *secdata, u32 seclen)
{
	if (secdata)
		kfree(secdata);
}

4585 4586
#ifdef CONFIG_KEYS

4587 4588
static int selinux_key_alloc(struct key *k, struct task_struct *tsk,
			     unsigned long flags)
4589 4590 4591 4592 4593 4594 4595 4596 4597
{
	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;
4598 4599 4600 4601
	if (tsec->keycreate_sid)
		ksec->sid = tsec->keycreate_sid;
	else
		ksec->sid = tsec->sid;
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 4637 4638 4639
	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

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4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672
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,

	.inode_alloc_security =		selinux_inode_alloc_security,
	.inode_free_security =		selinux_inode_free_security,
4673
	.inode_init_security =		selinux_inode_init_security,
L
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4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691
	.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,
4692
	.inode_xattr_getsuffix =        selinux_inode_xattr_getsuffix,
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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
	.inode_getsecurity =            selinux_inode_getsecurity,
	.inode_setsecurity =            selinux_inode_setsecurity,
	.inode_listsecurity =           selinux_inode_listsecurity,

	.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,

	.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,
4718
	.task_getsecid =		selinux_task_getsecid,
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4719 4720
	.task_setgroups =		selinux_task_setgroups,
	.task_setnice =			selinux_task_setnice,
4721
	.task_setioprio =		selinux_task_setioprio,
4722
	.task_getioprio =		selinux_task_getioprio,
L
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4723 4724 4725
	.task_setrlimit =		selinux_task_setrlimit,
	.task_setscheduler =		selinux_task_setscheduler,
	.task_getscheduler =		selinux_task_getscheduler,
4726
	.task_movememory =		selinux_task_movememory,
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Linus Torvalds 已提交
4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764
	.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,
	.unregister_security =		selinux_unregister_security,

	.d_instantiate =                selinux_d_instantiate,

	.getprocattr =                  selinux_getprocattr,
	.setprocattr =                  selinux_setprocattr,

4765 4766 4767
	.secid_to_secctx =		selinux_secid_to_secctx,
	.release_secctx =		selinux_release_secctx,

L
Linus Torvalds 已提交
4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784
        .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
4785 4786
	.socket_getpeersec_stream =	selinux_socket_getpeersec_stream,
	.socket_getpeersec_dgram =	selinux_socket_getpeersec_dgram,
L
Linus Torvalds 已提交
4787 4788
	.sk_alloc_security =		selinux_sk_alloc_security,
	.sk_free_security =		selinux_sk_free_security,
4789
	.sk_clone_security =		selinux_sk_clone_security,
V
Venkat Yekkirala 已提交
4790
	.sk_getsecid = 			selinux_sk_getsecid,
4791 4792 4793
	.sock_graft =			selinux_sock_graft,
	.inet_conn_request =		selinux_inet_conn_request,
	.inet_csk_clone =		selinux_inet_csk_clone,
4794
	.inet_conn_established =	selinux_inet_conn_established,
4795
	.req_classify_flow =		selinux_req_classify_flow,
4796 4797 4798 4799 4800

#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
4801
	.xfrm_policy_delete_security =	selinux_xfrm_policy_delete,
4802 4803
	.xfrm_state_alloc_security =	selinux_xfrm_state_alloc,
	.xfrm_state_free_security =	selinux_xfrm_state_free,
C
Catherine Zhang 已提交
4804
	.xfrm_state_delete_security =	selinux_xfrm_state_delete,
4805
	.xfrm_policy_lookup = 		selinux_xfrm_policy_lookup,
4806 4807
	.xfrm_state_pol_flow_match =	selinux_xfrm_state_pol_flow_match,
	.xfrm_decode_session =		selinux_xfrm_decode_session,
L
Linus Torvalds 已提交
4808
#endif
4809 4810 4811 4812 4813 4814

#ifdef CONFIG_KEYS
	.key_alloc =                    selinux_key_alloc,
	.key_free =                     selinux_key_free,
	.key_permission =               selinux_key_permission,
#endif
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4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833
};

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;

4834 4835 4836
	sel_inode_cache = kmem_cache_create("selinux_inode_security",
					    sizeof(struct inode_security_struct),
					    0, SLAB_PANIC, NULL, NULL);
L
Linus Torvalds 已提交
4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849
	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) {
		printk(KERN_INFO "SELinux:  Starting in enforcing mode\n");
	} else {
		printk(KERN_INFO "SELinux:  Starting in permissive mode\n");
	}
4850 4851 4852

#ifdef CONFIG_KEYS
	/* Add security information to initial keyrings */
4853 4854 4855 4856
	selinux_key_alloc(&root_user_keyring, current,
			  KEY_ALLOC_NOT_IN_QUOTA);
	selinux_key_alloc(&root_session_keyring, current,
			  KEY_ALLOC_NOT_IN_QUOTA);
4857 4858
#endif

L
Linus Torvalds 已提交
4859 4860 4861 4862 4863 4864 4865 4866 4867
	return 0;
}

void selinux_complete_init(void)
{
	printk(KERN_INFO "SELinux:  Completing initialization.\n");

	/* Set up any superblocks initialized prior to the policy load. */
	printk(KERN_INFO "SELinux:  Setting up existing superblocks.\n");
4868
	spin_lock(&sb_lock);
L
Linus Torvalds 已提交
4869 4870 4871 4872 4873 4874 4875 4876 4877 4878
	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);
4879
		spin_unlock(&sb_lock);
L
Linus Torvalds 已提交
4880 4881 4882 4883
		down_read(&sb->s_umount);
		if (sb->s_root)
			superblock_doinit(sb, NULL);
		drop_super(sb);
4884
		spin_lock(&sb_lock);
L
Linus Torvalds 已提交
4885 4886 4887 4888 4889
		spin_lock(&sb_security_lock);
		list_del_init(&sbsec->list);
		goto next_sb;
	}
	spin_unlock(&sb_security_lock);
4890
	spin_unlock(&sb_lock);
L
Linus Torvalds 已提交
4891 4892 4893 4894 4895 4896
}

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

4897
#if defined(CONFIG_NETFILTER)
L
Linus Torvalds 已提交
4898 4899 4900 4901 4902 4903 4904 4905 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 4937 4938

static struct nf_hook_ops selinux_ipv4_op = {
	.hook =		selinux_ipv4_postroute_last,
	.owner =	THIS_MODULE,
	.pf =		PF_INET,
	.hooknum =	NF_IP_POST_ROUTING,
	.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,
	.hooknum =	NF_IP6_POST_ROUTING,
	.priority =	NF_IP6_PRI_SELINUX_LAST,
};

#endif	/* IPV6 */

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

	if (!selinux_enabled)
		goto out;
		
	printk(KERN_INFO "SELinux:  Registering netfilter hooks\n");
	
	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 */
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out:
	return err;
}

__initcall(selinux_nf_ip_init);

#ifdef CONFIG_SECURITY_SELINUX_DISABLE
static void selinux_nf_ip_exit(void)
{
	printk(KERN_INFO "SELinux:  Unregistering netfilter hooks\n");

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

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#else /* CONFIG_NETFILTER */
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#ifdef CONFIG_SECURITY_SELINUX_DISABLE
#define selinux_nf_ip_exit()
#endif

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#endif /* CONFIG_NETFILTER */
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#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;
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	selinux_enabled = 0;
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	/* 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