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-rw-r--r--lib/ssh/src/ssh_transport.erl33
1 files changed, 24 insertions, 9 deletions
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index f4e6a23a1e..2e7391e1f8 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -246,26 +246,41 @@ handle_kexinit_msg(#ssh_msg_kexinit{} = CounterPart, #ssh_msg_kexinit{} = Own,
Ssh0#ssh{algorithms = Algoritms});
_ ->
%% TODO: Correct code?
- throw(#ssh_msg_disconnect{code = ?SSH_DISCONNECT_PROTOCOL_ERROR,
+ throw(#ssh_msg_disconnect{code = ?SSH_DISCONNECT_KEY_EXCHANGE_FAILED,
description = "Selection of key exchange"
" algorithm failed",
- language = "en"})
+ language = ""})
end;
handle_kexinit_msg(#ssh_msg_kexinit{} = CounterPart, #ssh_msg_kexinit{} = Own,
#ssh{role = server} = Ssh) ->
{ok, Algoritms} = select_algorithm(server, CounterPart, Own),
- {ok, Ssh#ssh{algorithms = Algoritms}}.
+ case verify_algorithm(Algoritms) of
+ true ->
+ {ok, Ssh#ssh{algorithms = Algoritms}};
+ _ ->
+ throw(#ssh_msg_disconnect{code = ?SSH_DISCONNECT_KEY_EXCHANGE_FAILED,
+ description = "Selection of key exchange"
+ " algorithm failed",
+ language = ""})
+ end.
%% TODO: diffie-hellman-group14-sha1 should also be supported.
%% Maybe check more things ...
-verify_algorithm(#alg{kex = 'diffie-hellman-group1-sha1'}) ->
- true;
-verify_algorithm(#alg{kex = 'diffie-hellman-group-exchange-sha1'}) ->
- true;
-verify_algorithm(_) ->
- false.
+
+verify_algorithm(#alg{kex = undefined}) -> false;
+verify_algorithm(#alg{hkey = undefined}) -> false;
+verify_algorithm(#alg{send_mac = undefined}) -> false;
+verify_algorithm(#alg{recv_mac = undefined}) -> false;
+verify_algorithm(#alg{encrypt = undefined}) -> false;
+verify_algorithm(#alg{decrypt = undefined}) -> false;
+verify_algorithm(#alg{compress = undefined}) -> false;
+verify_algorithm(#alg{decompress = undefined}) -> false;
+
+verify_algorithm(#alg{kex = 'diffie-hellman-group1-sha1'}) -> true;
+verify_algorithm(#alg{kex = 'diffie-hellman-group-exchange-sha1'}) -> true;
+verify_algorithm(_) -> false.
key_exchange_first_msg('diffie-hellman-group1-sha1', Ssh0) ->
{G, P} = dh_group1(),