[linux-2.6-block.git] / security / selinux / netlabel.c

/*
 * SELinux NetLabel Support
 *
 * This file provides the necessary glue to tie NetLabel into the SELinux
 * subsystem.
 *
 * Author: Paul Moore <paul.moore@hp.com>
 *
 */

/*
 * (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008
 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program;  if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/sock.h>
#include <net/netlabel.h>
#include <net/ip.h>
#include <net/ipv6.h>

#include "objsec.h"
#include "security.h"
#include "netlabel.h"

/**
 * selinux_netlbl_sidlookup_cached - Cache a SID lookup
 * @skb: the packet
 * @secattr: the NetLabel security attributes
 * @sid: the SID
 *
 * Description:
 * Query the SELinux security server to lookup the correct SID for the given
 * security attributes.  If the query is successful, cache the result to speed
 * up future lookups.  Returns zero on success, negative values on failure.
 *
 */
static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
					   struct netlbl_lsm_secattr *secattr,
					   u32 *sid)
{
	int rc;

	rc = security_netlbl_secattr_to_sid(secattr, sid);
	if (rc == 0 &&
	    (secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
	    (secattr->flags & NETLBL_SECATTR_CACHE))
		netlbl_cache_add(skb, secattr);

	return rc;
}

/**
 * selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr
 * @sk: the socket
 *
 * Description:
 * Generate the NetLabel security attributes for a socket, making full use of
 * the socket's attribute cache.  Returns a pointer to the security attributes
 * on success, NULL on failure.
 *
 */
static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
{
	int rc;
	struct sk_security_struct *sksec = sk->sk_security;
	struct netlbl_lsm_secattr *secattr;

	if (sksec->nlbl_secattr != NULL)
		return sksec->nlbl_secattr;

	secattr = netlbl_secattr_alloc(GFP_ATOMIC);
	if (secattr == NULL)
		return NULL;
	rc = security_netlbl_sid_to_secattr(sksec->sid, secattr);
	if (rc != 0) {
		netlbl_secattr_free(secattr);
		return NULL;
	}
	sksec->nlbl_secattr = secattr;

	return secattr;
}

/**
 * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
 *
 * Description:
 * Invalidate the NetLabel security attribute mapping cache.
 *
 */
void selinux_netlbl_cache_invalidate(void)
{
	netlbl_cache_invalidate();
}

/**
 * selinux_netlbl_err - Handle a NetLabel packet error
 * @skb: the packet
 * @error: the error code
 * @gateway: true if host is acting as a gateway, false otherwise
 *
 * Description:
 * When a packet is dropped due to a call to avc_has_perm() pass the error
 * code to the NetLabel subsystem so any protocol specific processing can be
 * done.  This is safe to call even if you are unsure if NetLabel labeling is
 * present on the packet, NetLabel is smart enough to only act when it should.
 *
 */
void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway)
{
	netlbl_skbuff_err(skb, error, gateway);
}

/**
 * selinux_netlbl_sk_security_free - Free the NetLabel fields
 * @sssec: the sk_security_struct
 *
 * Description:
 * Free all of the memory in the NetLabel fields of a sk_security_struct.
 *
 */
void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec)
{
	if (ssec->nlbl_secattr != NULL)
		netlbl_secattr_free(ssec->nlbl_secattr);
}

/**
 * selinux_netlbl_sk_security_reset - Reset the NetLabel fields
 * @ssec: the sk_security_struct
 * @family: the socket family
 *
 * Description:
 * Called when the NetLabel state of a sk_security_struct needs to be reset.
 * The caller is responsibile for all the NetLabel sk_security_struct locking.
 *
 */
void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec)
{
	ssec->nlbl_state = NLBL_UNSET;
}

/**
 * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
 * @skb: the packet
 * @family: protocol family
 * @type: NetLabel labeling protocol type
 * @sid: the SID
 *
 * Description:
 * Call the NetLabel mechanism to get the security attributes of the given
 * packet and use those attributes to determine the correct context/SID to
 * assign to the packet.  Returns zero on success, negative values on failure.
 *
 */
int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
				 u16 family,
				 u32 *type,
				 u32 *sid)
{
	int rc;
	struct netlbl_lsm_secattr secattr;

	if (!netlbl_enabled()) {
		*sid = SECSID_NULL;
		return 0;
	}

	netlbl_secattr_init(&secattr);
	rc = netlbl_skbuff_getattr(skb, family, &secattr);
	if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
		rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid);
	else
		*sid = SECSID_NULL;
	*type = secattr.type;
	netlbl_secattr_destroy(&secattr);

	return rc;
}

/**
 * selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid
 * @skb: the packet
 * @family: protocol family
 * @sid: the SID
 *
 * Description
 * Call the NetLabel mechanism to set the label of a packet using @sid.
 * Returns zero on success, negative values on failure.
 *
 */
int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
				 u16 family,
				 u32 sid)
{
	int rc;
	struct netlbl_lsm_secattr secattr_storage;
	struct netlbl_lsm_secattr *secattr = NULL;
	struct sock *sk;

	/* if this is a locally generated packet check to see if it is already
	 * being labeled by it's parent socket, if it is just exit */
	sk = skb->sk;
	if (sk != NULL) {
		struct sk_security_struct *sksec = sk->sk_security;
		if (sksec->nlbl_state != NLBL_REQSKB)
			return 0;
		secattr = sksec->nlbl_secattr;
	}
	if (secattr == NULL) {
		secattr = &secattr_storage;
		netlbl_secattr_init(secattr);
		rc = security_netlbl_sid_to_secattr(sid, secattr);
		if (rc != 0)
			goto skbuff_setsid_return;
	}

	rc = netlbl_skbuff_setattr(skb, family, secattr);

skbuff_setsid_return:
	if (secattr == &secattr_storage)
		netlbl_secattr_destroy(secattr);
	return rc;
}

/**
 * selinux_netlbl_inet_conn_request - Label an incoming stream connection
 * @req: incoming connection request socket
 *
 * Description:
 * A new incoming connection request is represented by @req, we need to label
 * the new request_sock here and the stack will ensure the on-the-wire label
 * will get preserved when a full sock is created once the connection handshake
 * is complete.  Returns zero on success, negative values on failure.
 *
 */
int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
{
	int rc;
	struct netlbl_lsm_secattr secattr;

	if (family != PF_INET)
		return 0;

	netlbl_secattr_init(&secattr);
	rc = security_netlbl_sid_to_secattr(req->secid, &secattr);
	if (rc != 0)
		goto inet_conn_request_return;
	rc = netlbl_req_setattr(req, &secattr);
inet_conn_request_return:
	netlbl_secattr_destroy(&secattr);
	return rc;
}

/**
 * selinux_netlbl_inet_csk_clone - Initialize the newly created sock
 * @sk: the new sock
 *
 * Description:
 * A new connection has been established using @sk, we've already labeled the
 * socket via the request_sock struct in selinux_netlbl_inet_conn_request() but
 * we need to set the NetLabel state here since we now have a sock structure.
 *
 */
void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
{
	struct sk_security_struct *sksec = sk->sk_security;

	if (family == PF_INET)
		sksec->nlbl_state = NLBL_LABELED;
	else
		sksec->nlbl_state = NLBL_UNSET;
}

/**
 * selinux_netlbl_socket_post_create - Label a socket using NetLabel
 * @sock: the socket to label
 * @family: protocol family
 *
 * Description:
 * Attempt to label a socket using the NetLabel mechanism using the given
 * SID.  Returns zero values on success, negative values on failure.
 *
 */
int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
{
	int rc;
	struct sk_security_struct *sksec = sk->sk_security;
	struct netlbl_lsm_secattr *secattr;

	if (family != PF_INET)
		return 0;

	secattr = selinux_netlbl_sock_genattr(sk);
	if (secattr == NULL)
		return -ENOMEM;
	rc = netlbl_sock_setattr(sk, family, secattr);
	switch (rc) {
	case 0:
		sksec->nlbl_state = NLBL_LABELED;
		break;
	case -EDESTADDRREQ:
		sksec->nlbl_state = NLBL_REQSKB;
		rc = 0;
		break;
	}

	return rc;
}

/**
 * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
 * @sksec: the sock's sk_security_struct
 * @skb: the packet
 * @family: protocol family
 * @ad: the audit data
 *
 * Description:
 * Fetch the NetLabel security attributes from @skb and perform an access check
 * against the receiving socket.  Returns zero on success, negative values on
 * error.
 *
 */
int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
				struct sk_buff *skb,
				u16 family,
				struct common_audit_data *ad)
{
	int rc;
	u32 nlbl_sid;
	u32 perm;
	struct netlbl_lsm_secattr secattr;

	if (!netlbl_enabled())
		return 0;

	netlbl_secattr_init(&secattr);
	rc = netlbl_skbuff_getattr(skb, family, &secattr);
	if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
		rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid);
	else
		nlbl_sid = SECINITSID_UNLABELED;
	netlbl_secattr_destroy(&secattr);
	if (rc != 0)
		return rc;

	switch (sksec->sclass) {
	case SECCLASS_UDP_SOCKET:
		perm = UDP_SOCKET__RECVFROM;
		break;
	case SECCLASS_TCP_SOCKET:
		perm = TCP_SOCKET__RECVFROM;
		break;
	default:
		perm = RAWIP_SOCKET__RECVFROM;
	}

	rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
	if (rc == 0)
		return 0;

	if (nlbl_sid != SECINITSID_UNLABELED)
		netlbl_skbuff_err(skb, rc, 0);
	return rc;
}

/**
 * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
 * @sock: the socket
 * @level: the socket level or protocol
 * @optname: the socket option name
 *
 * Description:
 * Check the setsockopt() call and if the user is trying to replace the IP
 * options on a socket and a NetLabel is in place for the socket deny the
 * access; otherwise allow the access.  Returns zero when the access is
 * allowed, -EACCES when denied, and other negative values on error.
 *
 */
int selinux_netlbl_socket_setsockopt(struct socket *sock,
				     int level,
				     int optname)
{
	int rc = 0;
	struct sock *sk = sock->sk;
	struct sk_security_struct *sksec = sk->sk_security;
	struct netlbl_lsm_secattr secattr;

	if (level == IPPROTO_IP && optname == IP_OPTIONS &&
	    (sksec->nlbl_state == NLBL_LABELED ||
	     sksec->nlbl_state == NLBL_CONNLABELED)) {
		netlbl_secattr_init(&secattr);
		lock_sock(sk);
		rc = netlbl_sock_getattr(sk, &secattr);
		release_sock(sk);
		if (rc == 0)
			rc = -EACCES;
		else if (rc == -ENOMSG)
			rc = 0;
		netlbl_secattr_destroy(&secattr);
	}

	return rc;
}

/**
 * selinux_netlbl_socket_connect - Label a client-side socket on connect
 * @sk: the socket to label
 * @addr: the destination address
 *
 * Description:
 * Attempt to label a connected socket with NetLabel using the given address.
 * Returns zero values on success, negative values on failure.
 *
 */
int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
{
	int rc;
	struct sk_security_struct *sksec = sk->sk_security;
	struct netlbl_lsm_secattr *secattr;

	if (sksec->nlbl_state != NLBL_REQSKB &&
	    sksec->nlbl_state != NLBL_CONNLABELED)
		return 0;

	local_bh_disable();
	bh_lock_sock_nested(sk);

	/* connected sockets are allowed to disconnect when the address family
	 * is set to AF_UNSPEC, if that is what is happening we want to reset
	 * the socket */
	if (addr->sa_family == AF_UNSPEC) {
		netlbl_sock_delattr(sk);
		sksec->nlbl_state = NLBL_REQSKB;
		rc = 0;
		goto socket_connect_return;
	}
	secattr = selinux_netlbl_sock_genattr(sk);
	if (secattr == NULL) {
		rc = -ENOMEM;
		goto socket_connect_return;
	}
	rc = netlbl_conn_setattr(sk, addr, secattr);
	if (rc == 0)
		sksec->nlbl_state = NLBL_CONNLABELED;

socket_connect_return:
	bh_unlock_sock(sk);
	local_bh_enable();
	return rc;
}
Commit	Line	Data
5778eabd PM	1	/*
	2	* SELinux NetLabel Support
	3	*
	4	* This file provides the necessary glue to tie NetLabel into the SELinux
	5	* subsystem.
	6	*
	7	* Author: Paul Moore <paul.moore@hp.com>
	8	*
	9	*/
	10
	11	/*
948bf85c	12	* (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008
5778eabd PM	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	22	* the GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	27	*
	28	*/
	29
	30	#include <linux/spinlock.h>
	31	#include <linux/rcupdate.h>
014ab19a PM	32	#include <linux/ip.h>
014ab19a PM	33	#include <linux/ipv6.h>
5778eabd PM	34	#include <net/sock.h>
5778eabd PM	35	#include <net/netlabel.h>
014ab19a PM	36	#include <net/ip.h>
014ab19a PM	37	#include <net/ipv6.h>
5778eabd PM	38
	39	#include "objsec.h"
	40	#include "security.h"
d4ee4231	41	#include "netlabel.h"
5778eabd	42
5dbe1eb0 PM	43	/**
	44	* selinux_netlbl_sidlookup_cached - Cache a SID lookup
	45	* @skb: the packet
	46	* @secattr: the NetLabel security attributes
	47	* @sid: the SID
	48	*
	49	* Description:
	50	* Query the SELinux security server to lookup the correct SID for the given
	51	* security attributes. If the query is successful, cache the result to speed
	52	* up future lookups. Returns zero on success, negative values on failure.
	53	*
	54	*/
	55	static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
	56	struct netlbl_lsm_secattr *secattr,
	57	u32 *sid)
	58	{
	59	int rc;
	60
	61	rc = security_netlbl_secattr_to_sid(secattr, sid);
	62	if (rc == 0 &&
	63	(secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
	64	(secattr->flags & NETLBL_SECATTR_CACHE))
	65	netlbl_cache_add(skb, secattr);
	66
	67	return rc;
	68	}
	69
6c5b3fc0 PM	70	/**
	71	* selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr
	72	* @sk: the socket
	73	*
	74	* Description:
	75	* Generate the NetLabel security attributes for a socket, making full use of
	76	* the socket's attribute cache. Returns a pointer to the security attributes
	77	* on success, NULL on failure.
	78	*
	79	*/
	80	static struct netlbl_lsm_secattr selinux_netlbl_sock_genattr(struct sock sk)
	81	{
	82	int rc;
	83	struct sk_security_struct *sksec = sk->sk_security;
	84	struct netlbl_lsm_secattr *secattr;
	85
	86	if (sksec->nlbl_secattr != NULL)
	87	return sksec->nlbl_secattr;
	88
	89	secattr = netlbl_secattr_alloc(GFP_ATOMIC);
	90	if (secattr == NULL)
	91	return NULL;
	92	rc = security_netlbl_sid_to_secattr(sksec->sid, secattr);
	93	if (rc != 0) {
	94	netlbl_secattr_free(secattr);
	95	return NULL;
	96	}
	97	sksec->nlbl_secattr = secattr;
	98
	99	return secattr;
	100	}
	101
5778eabd PM	102	/**
	103	* selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
	104	*
	105	* Description:
	106	* Invalidate the NetLabel security attribute mapping cache.
	107	*
	108	*/
	109	void selinux_netlbl_cache_invalidate(void)
	110	{
	111	netlbl_cache_invalidate();
	112	}
	113
dfaebe98 PM	114	/**
	115	* selinux_netlbl_err - Handle a NetLabel packet error
	116	* @skb: the packet
	117	* @error: the error code
	118	* @gateway: true if host is acting as a gateway, false otherwise
	119	*
	120	* Description:
	121	* When a packet is dropped due to a call to avc_has_perm() pass the error
	122	* code to the NetLabel subsystem so any protocol specific processing can be
	123	* done. This is safe to call even if you are unsure if NetLabel labeling is
	124	* present on the packet, NetLabel is smart enough to only act when it should.
	125	*
	126	*/
	127	void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway)
	128	{
	129	netlbl_skbuff_err(skb, error, gateway);
	130	}
	131
6c5b3fc0 PM	132	/**
	133	* selinux_netlbl_sk_security_free - Free the NetLabel fields
	134	* @sssec: the sk_security_struct
	135	*
	136	* Description:
	137	* Free all of the memory in the NetLabel fields of a sk_security_struct.
	138	*
	139	*/
	140	void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec)
	141	{
	142	if (ssec->nlbl_secattr != NULL)
	143	netlbl_secattr_free(ssec->nlbl_secattr);
	144	}
	145
5778eabd PM	146	/**
	147	* selinux_netlbl_sk_security_reset - Reset the NetLabel fields
	148	* @ssec: the sk_security_struct
	149	* @family: the socket family
	150	*
	151	* Description:
	152	* Called when the NetLabel state of a sk_security_struct needs to be reset.
	153	* The caller is responsibile for all the NetLabel sk_security_struct locking.
	154	*
	155	*/
389fb800	156	void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec)
5778eabd	157	{
389fb800	158	ssec->nlbl_state = NLBL_UNSET;
5778eabd PM	159	}
5778eabd PM	160
5778eabd PM	161	/**
	162	* selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
	163	* @skb: the packet
75e22910	164	* @family: protocol family
220deb96	165	* @type: NetLabel labeling protocol type
5778eabd PM	166	* @sid: the SID
	167	*
	168	* Description:
	169	* Call the NetLabel mechanism to get the security attributes of the given
	170	* packet and use those attributes to determine the correct context/SID to
	171	* assign to the packet. Returns zero on success, negative values on failure.
	172	*
	173	*/
75e22910 PM	174	int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
75e22910 PM	175	u16 family,
220deb96	176	u32 *type,
75e22910	177	u32 *sid)
5778eabd PM	178	{
	179	int rc;
	180	struct netlbl_lsm_secattr secattr;
	181
23bcdc1a PM	182	if (!netlbl_enabled()) {
	183	*sid = SECSID_NULL;
	184	return 0;
	185	}
	186
5778eabd	187	netlbl_secattr_init(&secattr);
75e22910	188	rc = netlbl_skbuff_getattr(skb, family, &secattr);
5dbe1eb0 PM	189	if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
	190	rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid);
	191	else
5778eabd	192	*sid = SECSID_NULL;
220deb96	193	*type = secattr.type;
5778eabd PM	194	netlbl_secattr_destroy(&secattr);
	195
	196	return rc;
	197	}
	198
948bf85c PM	199	/**
	200	* selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid
	201	* @skb: the packet
	202	* @family: protocol family
	203	* @sid: the SID
	204	*
	205	* Description
	206	* Call the NetLabel mechanism to set the label of a packet using @sid.
af901ca1	207	* Returns zero on success, negative values on failure.
948bf85c PM	208	*
	209	*/
	210	int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
	211	u16 family,
	212	u32 sid)
	213	{
	214	int rc;
6c5b3fc0 PM	215	struct netlbl_lsm_secattr secattr_storage;
6c5b3fc0 PM	216	struct netlbl_lsm_secattr *secattr = NULL;
948bf85c PM	217	struct sock *sk;
	218
	219	/* if this is a locally generated packet check to see if it is already
	220	* being labeled by it's parent socket, if it is just exit */
	221	sk = skb->sk;
	222	if (sk != NULL) {
	223	struct sk_security_struct *sksec = sk->sk_security;
	224	if (sksec->nlbl_state != NLBL_REQSKB)
	225	return 0;
6c5b3fc0 PM	226	secattr = sksec->nlbl_secattr;
	227	}
	228	if (secattr == NULL) {
	229	secattr = &secattr_storage;
	230	netlbl_secattr_init(secattr);
	231	rc = security_netlbl_sid_to_secattr(sid, secattr);
	232	if (rc != 0)
	233	goto skbuff_setsid_return;
948bf85c PM	234	}
948bf85c PM	235
6c5b3fc0	236	rc = netlbl_skbuff_setattr(skb, family, secattr);
948bf85c PM	237
948bf85c PM	238	skbuff_setsid_return:
6c5b3fc0 PM	239	if (secattr == &secattr_storage)
6c5b3fc0 PM	240	netlbl_secattr_destroy(secattr);
948bf85c PM	241	return rc;
	242	}
	243
5778eabd	244	/**
389fb800 PM	245	* selinux_netlbl_inet_conn_request - Label an incoming stream connection
389fb800 PM	246	* @req: incoming connection request socket
5778eabd PM	247	*
5778eabd PM	248	* Description:
389fb800 PM	249	* A new incoming connection request is represented by @req, we need to label
	250	* the new request_sock here and the stack will ensure the on-the-wire label
	251	* will get preserved when a full sock is created once the connection handshake
	252	* is complete. Returns zero on success, negative values on failure.
5778eabd PM	253	*
5778eabd PM	254	*/
389fb800	255	int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
5778eabd	256	{
014ab19a	257	int rc;
389fb800	258	struct netlbl_lsm_secattr secattr;
014ab19a	259
389fb800 PM	260	if (family != PF_INET)
389fb800 PM	261	return 0;
014ab19a	262
389fb800 PM	263	netlbl_secattr_init(&secattr);
	264	rc = security_netlbl_sid_to_secattr(req->secid, &secattr);
	265	if (rc != 0)
	266	goto inet_conn_request_return;
	267	rc = netlbl_req_setattr(req, &secattr);
	268	inet_conn_request_return:
	269	netlbl_secattr_destroy(&secattr);
	270	return rc;
5778eabd PM	271	}
	272
	273	/**
389fb800 PM	274	* selinux_netlbl_inet_csk_clone - Initialize the newly created sock
389fb800 PM	275	* @sk: the new sock
5778eabd PM	276	*
5778eabd PM	277	* Description:
389fb800 PM	278	* A new connection has been established using @sk, we've already labeled the
	279	* socket via the request_sock struct in selinux_netlbl_inet_conn_request() but
	280	* we need to set the NetLabel state here since we now have a sock structure.
5778eabd PM	281	*
5778eabd PM	282	*/
389fb800	283	void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
5778eabd	284	{
389fb800 PM	285	struct sk_security_struct *sksec = sk->sk_security;
	286
	287	if (family == PF_INET)
	288	sksec->nlbl_state = NLBL_LABELED;
	289	else
	290	sksec->nlbl_state = NLBL_UNSET;
5778eabd PM	291	}
	292
	293	/**
389fb800 PM	294	* selinux_netlbl_socket_post_create - Label a socket using NetLabel
	295	* @sock: the socket to label
	296	* @family: protocol family
5778eabd PM	297	*
5778eabd PM	298	* Description:
389fb800 PM	299	* Attempt to label a socket using the NetLabel mechanism using the given
389fb800 PM	300	* SID. Returns zero values on success, negative values on failure.
5778eabd PM	301	*
5778eabd PM	302	*/
389fb800	303	int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
5778eabd PM	304	{
5778eabd PM	305	int rc;
389fb800 PM	306	struct sk_security_struct *sksec = sk->sk_security;
389fb800 PM	307	struct netlbl_lsm_secattr *secattr;
5778eabd	308
389fb800	309	if (family != PF_INET)
5778eabd	310	return 0;
f74af6e8	311
389fb800 PM	312	secattr = selinux_netlbl_sock_genattr(sk);
	313	if (secattr == NULL)
	314	return -ENOMEM;
	315	rc = netlbl_sock_setattr(sk, family, secattr);
	316	switch (rc) {
	317	case 0:
	318	sksec->nlbl_state = NLBL_LABELED;
	319	break;
	320	case -EDESTADDRREQ:
	321	sksec->nlbl_state = NLBL_REQSKB;
f74af6e8	322	rc = 0;
389fb800 PM	323	break;
389fb800 PM	324	}
5778eabd PM	325
	326	return rc;
	327	}
	328
	329	/**
	330	* selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
	331	* @sksec: the sock's sk_security_struct
	332	* @skb: the packet
75e22910	333	* @family: protocol family
5778eabd PM	334	* @ad: the audit data
	335	*
	336	* Description:
	337	* Fetch the NetLabel security attributes from @skb and perform an access check
	338	* against the receiving socket. Returns zero on success, negative values on
	339	* error.
	340	*
	341	*/
	342	int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
	343	struct sk_buff *skb,
75e22910	344	u16 family,
2bf49690	345	struct common_audit_data *ad)
5778eabd PM	346	{
5778eabd PM	347	int rc;
f36158c4 PM	348	u32 nlbl_sid;
	349	u32 perm;
	350	struct netlbl_lsm_secattr secattr;
5778eabd	351
23bcdc1a PM	352	if (!netlbl_enabled())
	353	return 0;
	354
f36158c4	355	netlbl_secattr_init(&secattr);
75e22910	356	rc = netlbl_skbuff_getattr(skb, family, &secattr);
5dbe1eb0 PM	357	if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
	358	rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid);
	359	else
f36158c4 PM	360	nlbl_sid = SECINITSID_UNLABELED;
f36158c4 PM	361	netlbl_secattr_destroy(&secattr);
5778eabd PM	362	if (rc != 0)
5778eabd PM	363	return rc;
8d9107e8	364
5778eabd PM	365	switch (sksec->sclass) {
5778eabd PM	366	case SECCLASS_UDP_SOCKET:
f36158c4	367	perm = UDP_SOCKET__RECVFROM;
5778eabd PM	368	break;
5778eabd PM	369	case SECCLASS_TCP_SOCKET:
f36158c4	370	perm = TCP_SOCKET__RECVFROM;
5778eabd PM	371	break;
5778eabd PM	372	default:
f36158c4	373	perm = RAWIP_SOCKET__RECVFROM;
5778eabd PM	374	}
5778eabd PM	375
f36158c4	376	rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
5778eabd PM	377	if (rc == 0)
	378	return 0;
	379
f36158c4	380	if (nlbl_sid != SECINITSID_UNLABELED)
dfaebe98	381	netlbl_skbuff_err(skb, rc, 0);
5778eabd PM	382	return rc;
	383	}
	384
	385	/**
	386	* selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
	387	* @sock: the socket
	388	* @level: the socket level or protocol
	389	* @optname: the socket option name
	390	*
	391	* Description:
	392	* Check the setsockopt() call and if the user is trying to replace the IP
	393	* options on a socket and a NetLabel is in place for the socket deny the
	394	* access; otherwise allow the access. Returns zero when the access is
	395	* allowed, -EACCES when denied, and other negative values on error.
	396	*
	397	*/
	398	int selinux_netlbl_socket_setsockopt(struct socket *sock,
	399	int level,
	400	int optname)
	401	{
	402	int rc = 0;
ba6ff9f2 PM	403	struct sock *sk = sock->sk;
ba6ff9f2 PM	404	struct sk_security_struct *sksec = sk->sk_security;
5778eabd PM	405	struct netlbl_lsm_secattr secattr;
5778eabd PM	406
5778eabd	407	if (level == IPPROTO_IP && optname == IP_OPTIONS &&
014ab19a PM	408	(sksec->nlbl_state == NLBL_LABELED \|\|
014ab19a PM	409	sksec->nlbl_state == NLBL_CONNLABELED)) {
5778eabd	410	netlbl_secattr_init(&secattr);
ba6ff9f2 PM	411	lock_sock(sk);
	412	rc = netlbl_sock_getattr(sk, &secattr);
	413	release_sock(sk);
09c50b4a	414	if (rc == 0)
5778eabd	415	rc = -EACCES;
09c50b4a PM	416	else if (rc == -ENOMSG)
09c50b4a PM	417	rc = 0;
5778eabd PM	418	netlbl_secattr_destroy(&secattr);
5778eabd PM	419	}
5778eabd PM	420
	421	return rc;
	422	}
014ab19a PM	423
	424	/**
	425	* selinux_netlbl_socket_connect - Label a client-side socket on connect
	426	* @sk: the socket to label
	427	* @addr: the destination address
	428	*
	429	* Description:
	430	* Attempt to label a connected socket with NetLabel using the given address.
	431	* Returns zero values on success, negative values on failure.
	432	*
	433	*/
	434	int selinux_netlbl_socket_connect(struct sock sk, struct sockaddr addr)
	435	{
	436	int rc;
	437	struct sk_security_struct *sksec = sk->sk_security;
6c5b3fc0	438	struct netlbl_lsm_secattr *secattr;
014ab19a PM	439
	440	if (sksec->nlbl_state != NLBL_REQSKB &&
	441	sksec->nlbl_state != NLBL_CONNLABELED)
	442	return 0;
	443
014ab19a PM	444	local_bh_disable();
	445	bh_lock_sock_nested(sk);
	446
	447	/* connected sockets are allowed to disconnect when the address family
	448	* is set to AF_UNSPEC, if that is what is happening we want to reset
	449	* the socket */
	450	if (addr->sa_family == AF_UNSPEC) {
	451	netlbl_sock_delattr(sk);
	452	sksec->nlbl_state = NLBL_REQSKB;
	453	rc = 0;
	454	goto socket_connect_return;
	455	}
6c5b3fc0 PM	456	secattr = selinux_netlbl_sock_genattr(sk);
	457	if (secattr == NULL) {
	458	rc = -ENOMEM;
014ab19a	459	goto socket_connect_return;
6c5b3fc0 PM	460	}
	461	rc = netlbl_conn_setattr(sk, addr, secattr);
	462	if (rc == 0)
	463	sksec->nlbl_state = NLBL_CONNLABELED;
014ab19a PM	464
	465	socket_connect_return:
	466	bh_unlock_sock(sk);
	467	local_bh_enable();
014ab19a PM	468	return rc;
014ab19a PM	469	}