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| author | Dmitry Safonov <dima@arista.com> | 2023-10-23 20:21:56 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-27 10:35:44 +0100 |
| commit | 0aadc73995d08f6b0dc061c14a564ffa46f5914e (patch) | |
| tree | d104c5c1772bec3362f2aababc1b5a79ec3e44bc /net/ipv6/tcp_ipv6.c | |
| parent | 4954f17ddefc51d218625dcdfaf422a253dad3fa (diff) | |
| download | linux-stable-0aadc73995d08f6b0dc061c14a564ffa46f5914e.tar.gz linux-stable-0aadc73995d08f6b0dc061c14a564ffa46f5914e.tar.bz2 linux-stable-0aadc73995d08f6b0dc061c14a564ffa46f5914e.zip | |
net/tcp: Prevent TCP-MD5 with TCP-AO being set
Be as conservative as possible: if there is TCP-MD5 key for a given peer
regardless of L3 interface - don't allow setting TCP-AO key for the same
peer. According to RFC5925, TCP-AO is supposed to replace TCP-MD5 and
there can't be any switch between both on any connected tuple.
Later it can be relaxed, if there's a use, but in the beginning restrict
any intersection.
Note: it's still should be possible to set both TCP-MD5 and TCP-AO keys
on a listening socket for *different* peers.
Co-developed-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Co-developed-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Acked-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 30bd17d03239..70a3842f47fa 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -600,6 +600,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, { struct tcp_md5sig cmd; struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; + union tcp_ao_addr *addr; int l3index = 0; u8 prefixlen; u8 flags; @@ -654,13 +655,28 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) return -EINVAL; - if (ipv6_addr_v4mapped(&sin6->sin6_addr)) - return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], + if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { + addr = (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3]; + + /* Don't allow keys for peers that have a matching TCP-AO key. + * See the comment in tcp_ao_add_cmd() + */ + if (tcp_ao_required(sk, addr, AF_INET)) + return -EKEYREJECTED; + return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, cmd.tcpm_key, cmd.tcpm_keylen); + } + + addr = (union tcp_md5_addr *)&sin6->sin6_addr; + + /* Don't allow keys for peers that have a matching TCP-AO key. + * See the comment in tcp_ao_add_cmd() + */ + if (tcp_ao_required(sk, addr, AF_INET6)) + return -EKEYREJECTED; - return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, - AF_INET6, prefixlen, l3index, flags, + return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags, cmd.tcpm_key, cmd.tcpm_keylen); } @@ -1903,6 +1919,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { .md5_parse = tcp_v6_parse_md5_keys, #endif #ifdef CONFIG_TCP_AO + .ao_lookup = tcp_v6_ao_lookup, .ao_parse = tcp_v6_parse_ao, #endif }; @@ -1934,6 +1951,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { .md5_parse = tcp_v6_parse_md5_keys, #endif #ifdef CONFIG_TCP_AO + .ao_lookup = tcp_v6_ao_lookup, .ao_parse = tcp_v6_parse_ao, #endif }; |