dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses.

[ Upstream commit 23be1e0e2a83a8543214d2599a31d9a2185a796b ]

Initially, commit 4237c75c0a35 ("[MLSXFRM]: Auto-labeling of child
sockets") introduced security_inet_conn_request() in some functions
where reqsk is allocated.  The hook is added just after the allocation,
so reqsk's IPv6 remote address was not initialised then.

However, SELinux/Smack started to read it in netlbl_req_setattr()
after commit e1adea927080 ("calipso: Allow request sockets to be
relabelled by the lsm.").

Commit 284904aa7946 ("lsm: Relocate the IPv4 security_inet_conn_request()
hooks") fixed that kind of issue only in TCPv4 because IPv6 labeling was
not supported at that time.  Finally, the same issue was introduced again
in IPv6.

Let's apply the same fix on DCCPv6 and TCPv6.

Fixes: e1adea927080 ("calipso: Allow request sockets to be relabelled by the lsm.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 9b8c6cf0e5eee4eea40083940695906270a4baf5..72ceefbf231205260af46fbf997fdd739895f56c 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -349,15 +349,15 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
        if (dccp_parse_options(sk, dreq, skb))
                goto drop_and_free;
 
-       if (security_inet_conn_request(sk, skb, req))
-               goto drop_and_free;
-
        ireq = inet_rsk(req);
        ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
        ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
        ireq->ireq_family = AF_INET6;
        ireq->ir_mark = inet_request_mark(sk, skb);
 
+       if (security_inet_conn_request(sk, skb, req))
+               goto drop_and_free;
+
        if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
            np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
            np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {

diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index d1bfdb9c2f2da6139c3a916ad4955a9106d575a6..3a54d3947052edecf35328a2160aaf87d3d57484 100644 (file)
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -183,14 +183,15 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
        treq = tcp_rsk(req);
        treq->tfo_listener = false;
 
-       if (security_inet_conn_request(sk, skb, req))
-               goto out_free;
-
        req->mss = mss;
        ireq->ir_rmt_port = th->source;
        ireq->ir_num = ntohs(th->dest);
        ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
        ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
+
+       if (security_inet_conn_request(sk, skb, req))
+               goto out_free;
+
        if (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) ||
            np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
            np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {