selinux: handle TCP SYN-ACK packets correctly in selinux_ip_output()

In selinux_ip_output() we always label packets based on the parent
socket.  While this approach works in almost all cases, it doesn't
work in the case of TCP SYN-ACK packets when the correct label is not
the label of the parent socket, but rather the label of the larval
socket represented by the request_sock struct.

Unfortunately, since the request_sock isn't queued on the parent
socket until *after* the SYN-ACK packet is sent, we can't lookup the
request_sock to determine the correct label for the packet; at this
point in time the best we can do is simply pass/NF_ACCEPT the packet.
It must be said that simply passing the packet without any explicit
labeling action, while far from ideal, is not terrible as the SYN-ACK
packet will inherit any IP option based labeling from the initial
connection request so the label *should* be correct and all our
access controls remain in place so we shouldn't have to worry about
information leaks.

Reported-by: Janak Desai <Janak.Desai@gtri.gatech.edu>
Tested-by: Janak Desai <Janak.Desai@gtri.gatech.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 777ee98273d1..877bab748c87 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -53,6 +53,7 @@
 #include <net/ip.h>             /* for local_port_range[] */
 #include <net/sock.h>
 #include <net/tcp.h>            /* struct or_callable used in sock_rcv_skb */
+#include <net/inet_connection_sock.h>
 #include <net/net_namespace.h>
 #include <net/netlabel.h>
 #include <linux/uaccess.h>
@@ -4731,6 +4732,7 @@ static unsigned int selinux_ipv6_forward(unsigned int hooknum,
 static unsigned int selinux_ip_output(struct sk_buff *skb,
                                       u16 family)
 {
+        struct sock *sk;
         u32 sid;
 
         if (!netlbl_enabled())
@@ -4739,8 +4741,27 @@ static unsigned int selinux_ip_output(struct sk_buff *skb,
         /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
          * because we want to make sure we apply the necessary labeling
          * before IPsec is applied so we can leverage AH protection */
-        if (skb->sk) {
-                struct sk_security_struct *sksec = skb->sk->sk_security;
+        sk = skb->sk;
+        if (sk) {
+                struct sk_security_struct *sksec;
+
+                if (sk->sk_state == TCP_LISTEN)
+                        /* if the socket is the listening state then this
+                         * packet is a SYN-ACK packet which means it needs to
+                         * be labeled based on the connection/request_sock and
+                         * not the parent socket.  unfortunately, we can't
+                         * lookup the request_sock yet as it isn't queued on
+                         * the parent socket until after the SYN-ACK is sent.
+                         * the "solution" is to simply pass the packet as-is
+                         * as any IP option based labeling should be copied
+                         * from the initial connection request (in the IP
+                         * layer).  it is far from ideal, but until we get a
+                         * security label in the packet itself this is the
+                         * best we can do. */
+                        return NF_ACCEPT;
+
+                /* standard practice, label using the parent socket */
+                sksec = sk->sk_security;
                 sid = sksec->sid;
         } else
                 sid = SECINITSID_KERNEL;