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SELinux: Return correct context for SO_PEERSEC 

Fix SO_PEERSEC for tcp sockets to return the security context of
the peer (as represented by the SA from the peer) as opposed to the
SA used by the local/source socket.

Signed-off-by: Venkat Yekkirala <vyekkirala@TrustedCS.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Venkat Yekkirala 2006-11-08 17:04:09 -06:00 committed by David S. Miller
parent c1a856c964
commit 6b877699c6
7 changed files with 50 additions and 48 deletions
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16
include/linux/security.h
View File

@ -826,6 +826,8 @@ struct request_sock;
* Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
* @inet_csk_clone:
* Sets the new child socket's sid to the openreq sid.
* @inet_conn_established:
* Sets the connection's peersid to the secmark on skb.
* @req_classify_flow:
* Sets the flow's sid to the openreq sid.
*
@ -1368,6 +1370,7 @@ struct security_operations {
int (*inet_conn_request)(struct sock *sk, struct sk_buff *skb,
struct request_sock *req);
void (*inet_csk_clone)(struct sock *newsk, const struct request_sock *req);
void (*inet_conn_established)(struct sock *sk, struct sk_buff *skb);
void (*req_classify_flow)(const struct request_sock *req, struct flowi *fl);
#endif /* CONFIG_SECURITY_NETWORK */
@ -2961,9 +2964,15 @@ static inline void security_inet_csk_clone(struct sock *newsk,
{
security_ops->inet_csk_clone(newsk, req);
}
static inline void security_inet_conn_established(struct sock *sk,
struct sk_buff *skb)
{
security_ops->inet_conn_established(sk, skb);
}
#else /* CONFIG_SECURITY_NETWORK */
static inline int security_unix_stream_connect(struct socket * sock,
struct socket * other,
struct socket * other,
struct sock * newsk)
{
return 0;
@ -3110,6 +3119,11 @@ static inline void security_inet_csk_clone(struct sock *newsk,
const struct request_sock *req)
{
}
static inline void security_inet_conn_established(struct sock *sk,
struct sk_buff *skb)
{
}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM

1
include/net/request_sock.h
View File

@ -54,6 +54,7 @@ struct request_sock {
struct request_sock_ops *rsk_ops;
struct sock *sk;
u32 secid;
u32 peer_secid;
};
static inline struct request_sock *reqsk_alloc(struct request_sock_ops *ops)

2
net/ipv4/tcp_input.c
View File

@ -4230,6 +4230,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
mb();
tcp_set_state(sk, TCP_ESTABLISHED);
security_inet_conn_established(sk, skb);
/* Make sure socket is routed, for correct metrics. */
icsk->icsk_af_ops->rebuild_header(sk);

6
security/dummy.c
View File

@ -828,6 +828,11 @@ static inline void dummy_inet_csk_clone(struct sock *newsk,
{
}
static inline void dummy_inet_conn_established(struct sock *sk,
struct sk_buff *skb)
{
}
static inline void dummy_req_classify_flow(const struct request_sock *req,
struct flowi *fl)
{
@ -1108,6 +1113,7 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, sock_graft);
set_to_dummy_if_null(ops, inet_conn_request);
set_to_dummy_if_null(ops, inet_csk_clone);
set_to_dummy_if_null(ops, inet_conn_established);
set_to_dummy_if_null(ops, req_classify_flow);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM

21
security/selinux/hooks.c
View File

@ -3535,8 +3535,10 @@ static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *op
}
else if (isec->sclass == SECCLASS_TCP_SOCKET) {
peer_sid = selinux_netlbl_socket_getpeersec_stream(sock);
if (peer_sid == SECSID_NULL)
peer_sid = selinux_socket_getpeer_stream(sock->sk);
if (peer_sid == SECSID_NULL) {
ssec = sock->sk->sk_security;
peer_sid = ssec->peer_sid;
}
if (peer_sid == SECSID_NULL) {
err = -ENOPROTOOPT;
goto out;
@ -3647,11 +3649,11 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
return 0;
}
err = selinux_xfrm_decode_session(skb, &peersid, 0);
BUG_ON(err);
selinux_skb_xfrm_sid(skb, &peersid);
if (peersid == SECSID_NULL) {
req->secid = sksec->sid;
req->peer_secid = 0;
return 0;
}
@ -3660,6 +3662,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
return err;
req->secid = newsid;
req->peer_secid = peersid;
return 0;
}
@ -3669,6 +3672,7 @@ static void selinux_inet_csk_clone(struct sock *newsk,
struct sk_security_struct *newsksec = newsk->sk_security;
newsksec->sid = req->secid;
newsksec->peer_sid = req->peer_secid;
/* 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
@ -3677,6 +3681,14 @@ static void selinux_inet_csk_clone(struct sock *newsk,
selinux_netlbl_sk_security_init(newsksec, req->rsk_ops->family);
}
static void selinux_inet_conn_established(struct sock *sk,
struct sk_buff *skb)
{
struct sk_security_struct *sksec = sk->sk_security;
selinux_skb_xfrm_sid(skb, &sksec->peer_sid);
}
static void selinux_req_classify_flow(const struct request_sock *req,
struct flowi *fl)
{
@ -4739,6 +4751,7 @@ static struct security_operations selinux_ops = {
.sock_graft = selinux_sock_graft,
.inet_conn_request = selinux_inet_conn_request,
.inet_csk_clone = selinux_inet_csk_clone,
.inet_conn_established = selinux_inet_conn_established,
.req_classify_flow = selinux_req_classify_flow,
#ifdef CONFIG_SECURITY_NETWORK_XFRM

12
security/selinux/include/xfrm.h
View File

@ -39,7 +39,6 @@ int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb,
struct avc_audit_data *ad);
int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
struct avc_audit_data *ad);
u32 selinux_socket_getpeer_stream(struct sock *sk);
u32 selinux_socket_getpeer_dgram(struct sk_buff *skb);
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall);
#else
@ -55,11 +54,6 @@ static inline int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
return 0;
}
static inline int selinux_socket_getpeer_stream(struct sock *sk)
{
return SECSID_NULL;
}
static inline int selinux_socket_getpeer_dgram(struct sk_buff *skb)
{
return SECSID_NULL;
@ -71,4 +65,10 @@ static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int
}
#endif
static inline void selinux_skb_xfrm_sid(struct sk_buff *skb, u32 *sid)
{
int err = selinux_xfrm_decode_session(skb, sid, 0);
BUG_ON(err);
}
#endif /* _SELINUX_XFRM_H_ */

40
security/selinux/xfrm.c
View File

@ -184,7 +184,8 @@ int selinux_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm,
}
/*
* LSM hook implementation that determines the sid for the session.
* LSM hook implementation that checks and/or returns the xfrm sid for the
* incoming packet.
*/
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
@ -402,44 +403,9 @@ void selinux_xfrm_state_free(struct xfrm_state *x)
kfree(ctx);
}
/*
* SELinux internal function to retrieve the context of a connected
* (sk->sk_state == TCP_ESTABLISHED) TCP socket based on its security
* association used to connect to the remote socket.
*
* Retrieve via getsockopt SO_PEERSEC.
*/
u32 selinux_socket_getpeer_stream(struct sock *sk)
{
struct dst_entry *dst, *dst_test;
u32 peer_sid = SECSID_NULL;
if (sk->sk_state != TCP_ESTABLISHED)
goto out;
dst = sk_dst_get(sk);
if (!dst)
goto out;
for (dst_test = dst; dst_test != 0;
dst_test = dst_test->child) {
struct xfrm_state *x = dst_test->xfrm;
if (x && selinux_authorizable_xfrm(x)) {
struct xfrm_sec_ctx *ctx = x->security;
peer_sid = ctx->ctx_sid;
break;
}
}
dst_release(dst);
out:
return peer_sid;
}
/*
* SELinux internal function to retrieve the context of a UDP packet
* based on its security association used to connect to the remote socket.
* based on its security association.
*
* Retrieve via setsockopt IP_PASSSEC and recvmsg with control message
* type SCM_SECURITY.