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authorHans Nilsson <[email protected]>2017-09-28 18:14:07 +0200
committerHans Nilsson <[email protected]>2017-09-28 18:38:29 +0200
commitb8d031c4fbb91454f72a0882afe5289fe0fce933 (patch)
tree0ff501472568d9108e822ca98d2428bc3ce2021f /lib
parent02fd746c40e829adbe77cc526c7df904698e2534 (diff)
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ssh: exclude aes_gcm if peer is OpenSSH 6.2 (known bug)
Diffstat (limited to 'lib')
-rw-r--r--lib/ssh/src/ssh_transport.erl21
1 files changed, 18 insertions, 3 deletions
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index c48c0800e4..0052347912 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -251,9 +251,9 @@ key_exchange_init_msg(Ssh0) ->
{SshPacket, Ssh} = ssh_packet(Msg, Ssh0),
{Msg, SshPacket, Ssh}.
-kex_init(#ssh{role = Role, opts = Opts, available_host_keys = HostKeyAlgs}) ->
+kex_init(#ssh{role = Role, opts = Opts, available_host_keys = HostKeyAlgs} = Ssh) ->
Random = ssh_bits:random(16),
- PrefAlgs = ?GET_OPT(preferred_algorithms, Opts),
+ PrefAlgs = adjust_algs_for_peer_version(Role, ?GET_OPT(preferred_algorithms, Opts), Ssh),
kexinit_message(Role, Random, PrefAlgs, HostKeyAlgs, Opts).
key_init(client, Ssh, Value) ->
@@ -261,7 +261,22 @@ key_init(client, Ssh, Value) ->
key_init(server, Ssh, Value) ->
Ssh#ssh{s_keyinit = Value}.
-
+adjust_algs_for_peer_version(client, PrefAlgs, #ssh{s_version=V}) ->
+ adjust_algs_for_peer_version(V, PrefAlgs);
+adjust_algs_for_peer_version(server, PrefAlgs, #ssh{c_version=V}) ->
+ adjust_algs_for_peer_version(V, PrefAlgs).
+%%
+adjust_algs_for_peer_version("SSH-2.0-OpenSSH_6.2"++_, PrefAlgs) ->
+ C0 = proplists:get_value(cipher, PrefAlgs, same([])),
+ C = [{D,L} || D <- [client2server, server2client],
+ L <- [[K || K <- proplists:get_value(D, C0, []),
+ K =/= '[email protected]']]
+ ],
+ lists:keyreplace(cipher, 1, PrefAlgs, {cipher,C});
+adjust_algs_for_peer_version(_, PrefAlgs) ->
+ PrefAlgs.
+
kexinit_message(Role, Random, Algs, HostKeyAlgs, Opts) ->
#ssh_msg_kexinit{
cookie = Random,