Commit 3e112172 authored by Paul Moore's avatar Paul Moore Committed by James Morris
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SELinux: Add network port SID cache 



Much like we added a network node cache, this patch adds a network port
cache. The design is taken almost completely from the network node cache
which in turn was taken from the network interface cache.  The basic idea is
to cache entries in a hash table based on protocol/port information.  The
hash function only takes the port number into account since the number of
different protocols in use at any one time is expected to be relatively
small.

Signed-off-by: default avatarPaul Moore <paul.moore@hp.com>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 832cbd9a

security/selinux/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ selinux-y := avc.o \ 
	     nlmsgtab.o \

	     netif.o \

	     netnode.o \

	     netport.o \

	     exports.o



selinux-$(CONFIG_SECURITY_NETWORK_XFRM) += xfrm.o

security/selinux/hooks.c

+8 −12
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ 
#include "objsec.h"

#include "netif.h"

#include "netnode.h"

#include "netport.h"

#include "xfrm.h"

#include "netlabel.h"
@@ -3670,10 +3671,8 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in 
			inet_get_local_port_range(&low, &high);



			if (snum < max(PROT_SOCK, low) || snum > high) {

				err = security_port_sid(sk->sk_family,

							sk->sk_type,

							sk->sk_protocol, snum,

							&sid);

				err = sel_netport_sid(sk->sk_protocol,

						      snum, &sid);

				if (err)

					goto out;

				AVC_AUDIT_DATA_INIT(&ad,NET);
@@ -3761,8 +3760,7 @@ static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, 
			snum = ntohs(addr6->sin6_port);

		}



		err = security_port_sid(sk->sk_family, sk->sk_type,

					sk->sk_protocol, snum, &sid);

		err = sel_netport_sid(sk->sk_protocol, snum, &sid);

		if (err)

			goto out;
@@ -3993,9 +3991,8 @@ static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk, 


	if (!recv_perm)

		return 0;

	err = security_port_sid(sk->sk_family, sk->sk_type,

				sk->sk_protocol, ntohs(ad->u.net.sport),

				&port_sid);

	err = sel_netport_sid(sk->sk_protocol,

			      ntohs(ad->u.net.sport), &port_sid);

	if (unlikely(err)) {

		printk(KERN_WARNING

		       "SELinux: failure in"
@@ -4416,9 +4413,8 @@ static int selinux_ip_postroute_iptables_compat(struct sock *sk, 
	if (send_perm != 0)

		return 0;



	err = security_port_sid(sk->sk_family, sk->sk_type,

				sk->sk_protocol, ntohs(ad->u.net.dport),

				&port_sid);

	err = sel_netport_sid(sk->sk_protocol,

			      ntohs(ad->u.net.dport), &port_sid);

	if (unlikely(err)) {

		printk(KERN_WARNING

		       "SELinux: failure in"

security/selinux/include/objsec.h

+6 −0
Original line number Diff line number Diff line
@@ -103,6 +103,12 @@ struct netnode_security_struct { 
	u16 family;			/* address family */

};



struct netport_security_struct {

	u32 sid;			/* SID for this node */

	u16 port;			/* port number */

	u8 protocol;			/* transport protocol */

};



struct sk_security_struct {

	u32 sid;			/* SID of this object */

	u32 peer_sid;			/* SID of peer */

security/selinux/include/security.h

+1 −2
Original line number Diff line number Diff line
@@ -102,8 +102,7 @@ int security_context_to_sid_default(char *scontext, u32 scontext_len, 
int security_get_user_sids(u32 callsid, char *username,

			   u32 **sids, u32 *nel);



int security_port_sid(u16 domain, u16 type, u8 protocol, u16 port,

	u32 *out_sid);

int security_port_sid(u8 protocol, u16 port, u32 *out_sid);



int security_netif_sid(char *name, u32 *if_sid);

security/selinux/ss/services.c

+1 −7
Original line number Diff line number Diff line
@@ -1472,17 +1472,11 @@ err: 


/**

 * security_port_sid - Obtain the SID for a port.

 * @domain: communication domain aka address family

 * @type: socket type

 * @protocol: protocol number

 * @port: port number

 * @out_sid: security identifier

 */

int security_port_sid(u16 domain,

		      u16 type,

		      u8 protocol,

		      u16 port,

		      u32 *out_sid)

int security_port_sid(u8 protocol, u16 port, u32 *out_sid)

{

	struct ocontext *c;

	int rc = 0;

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