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authorVenkat Yekkirala <vyekkirala@trustedcs.com>2006-11-08 17:04:09 -0600
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:21:33 -0800
commit6b877699c6f1efede4545bcecc367786a472eedb (patch)
treec0a60dc90578fa9f16d4496e2700bc285eab47c0 /security
parentc1a856c9640c9ff3d70bbd8214b6a0974609eef8 (diff)
downloadleg-kernel-6b877699c6f1efede4545bcecc367786a472eedb.tar.gz
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>
Diffstat (limited to 'security')
-rw-r--r--security/dummy.c6
-rw-r--r--security/selinux/hooks.c21
-rw-r--r--security/selinux/include/xfrm.h12
-rw-r--r--security/selinux/xfrm.c40
4 files changed, 32 insertions, 47 deletions
diff --git a/security/dummy.c b/security/dummy.c
index 838d8442cf3c..0148d1518dd1 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -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
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 28ee187ed224..5bbd599a4471 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -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
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 8e329ddb5e37..27502365d706 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -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_ */
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index 4d5a043cdfa1..8fef74271f22 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -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)
@@ -403,43 +404,8 @@ void selinux_xfrm_state_free(struct xfrm_state *x)
}
/*
- * 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.