diff options
Diffstat (limited to 'lib/ssh/src/ssh_connection_handler.erl')
| -rw-r--r-- | lib/ssh/src/ssh_connection_handler.erl | 121 |
1 files changed, 72 insertions, 49 deletions
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl index 4158a52a27..0ca960ef96 100644 --- a/lib/ssh/src/ssh_connection_handler.erl +++ b/lib/ssh/src/ssh_connection_handler.erl @@ -46,6 +46,7 @@ %%% Internal application API -export([start_connection/4, + available_hkey_algorithms/2, open_channel/6, request/6, request/7, reply_request/3, @@ -324,23 +325,32 @@ renegotiate_data(ConnectionHandler) -> %% Internal process state %%==================================================================== -record(data, { - starter :: pid(), + starter :: pid() + | undefined, auth_user :: string() | undefined, connection_state :: #connection{}, - latest_channel_id = 0 :: non_neg_integer(), + latest_channel_id = 0 :: non_neg_integer() + | undefined, idle_timer_ref :: undefined | infinity | reference(), idle_timer_value = infinity :: infinity | pos_integer(), - transport_protocol :: atom(), % ex: tcp - transport_cb :: atom(), % ex: gen_tcp - transport_close_tag :: atom(), % ex: tcp_closed - ssh_params :: #ssh{}, - socket :: inet:socket(), - decrypted_data_buffer = <<>> :: binary(), - encrypted_data_buffer = <<>> :: binary(), + transport_protocol :: atom() + | undefined, % ex: tcp + transport_cb :: atom() + | undefined, % ex: gen_tcp + transport_close_tag :: atom() + | undefined, % ex: tcp_closed + ssh_params :: #ssh{} + | undefined, + socket :: inet:socket() + | undefined, + decrypted_data_buffer = <<>> :: binary() + | undefined, + encrypted_data_buffer = <<>> :: binary() + | undefined, undecrypted_packet_length :: undefined | non_neg_integer(), key_exchange_init_msg :: #ssh_msg_kexinit{} | undefined, @@ -369,16 +379,17 @@ init_connection_handler(Role, Socket, Opts) -> StartState, D); - {stop, enotconn} -> - %% Handles the abnormal sequence: - %% SYN-> - %% <-SYNACK - %% ACK-> - %% RST-> - exit({shutdown, "TCP connection to server was prematurely closed by the client"}); - - {stop, OtherError} -> - exit({shutdown, {init,OtherError}}) + {stop, Error} -> + Sups = ?GET_INTERNAL_OPT(supervisors, Opts), + C = #connection{system_supervisor = proplists:get_value(system_sup, Sups), + sub_system_supervisor = proplists:get_value(subsystem_sup, Sups), + connection_supervisor = proplists:get_value(connection_sup, Sups) + }, + gen_statem:enter_loop(?MODULE, + [], + {init_error,Error}, + #data{connection_state=C, + socket=Socket}) end. @@ -432,13 +443,12 @@ init_ssh_record(Role, Socket, Opts) -> init_ssh_record(Role, Socket, PeerAddr, Opts). init_ssh_record(Role, _Socket, PeerAddr, Opts) -> - KeyCb = ?GET_OPT(key_cb, Opts), AuthMethods = ?GET_OPT(auth_methods, Opts), S0 = #ssh{role = Role, - key_cb = KeyCb, + key_cb = ?GET_OPT(key_cb, Opts), opts = Opts, userauth_supported_methods = AuthMethods, - available_host_keys = supported_host_keys(Role, KeyCb, Opts), + available_host_keys = available_hkey_algorithms(Role, Opts), random_length_padding = ?GET_OPT(max_random_length_padding, Opts) }, @@ -531,6 +541,21 @@ renegotiation(_) -> false. callback_mode() -> handle_event_function. + +handle_event(_, _Event, {init_error,Error}, _) -> + case Error of + enotconn -> + %% Handles the abnormal sequence: + %% SYN-> + %% <-SYNACK + %% ACK-> + %% RST-> + {stop, {shutdown,"TCP connenction to server was prematurely closed by the client"}}; + + OtherError -> + {stop, {shutdown,{init,OtherError}}} + end; + %%% ######## {hello, client|server} #### %% The very first event that is sent when the we are set as controlling process of Socket handle_event(_, socket_control, {hello,_}, D) -> @@ -1544,44 +1569,42 @@ peer_role(client) -> server; peer_role(server) -> client. %%-------------------------------------------------------------------- -supported_host_keys(client, _, Options) -> - try - find_sup_hkeys(Options) - of - [] -> +available_hkey_algorithms(Role, Options) -> + KeyCb = ?GET_OPT(key_cb, Options), + case [A || A <- available_hkey_algos(Options), + (Role==client) orelse available_host_key(KeyCb, A, Options) + ] of + + [] when Role==client -> error({shutdown, "No public key algs"}); - Algs -> - [atom_to_list(A) || A<-Algs] - catch - exit:Reason -> - error({shutdown, Reason}) - end; -supported_host_keys(server, KeyCb, Options) -> - [atom_to_list(A) || A <- find_sup_hkeys(Options), - available_host_key(KeyCb, A, Options) - ]. + [] when Role==server -> + error({shutdown, "No host key available"}); -find_sup_hkeys(Options) -> - case proplists:get_value(public_key, - ?GET_OPT(preferred_algorithms,Options) - ) - of - undefined -> - ssh_transport:default_algorithms(public_key); - L -> - NonSupported = L--ssh_transport:supported_algorithms(public_key), - L -- NonSupported + Algs -> + [atom_to_list(A) || A<-Algs] end. +available_hkey_algos(Options) -> + SupAlgos = ssh_transport:supported_algorithms(public_key), + HKeys = proplists:get_value(public_key, + ?GET_OPT(preferred_algorithms,Options) + ), + NonSupported = HKeys -- SupAlgos, + AvailableAndSupported = HKeys -- NonSupported, + AvailableAndSupported. + %% Alg :: atom() available_host_key({KeyCb,KeyCbOpts}, Alg, Opts) -> UserOpts = ?GET_OPT(user_options, Opts), case KeyCb:host_key(Alg, [{key_cb_private,KeyCbOpts}|UserOpts]) of - {ok,_} -> true; - _ -> false + {ok,Key} -> + %% Check the key - the KeyCb may be a buggy plugin + ssh_transport:valid_key_sha_alg(Key, Alg); + _ -> + false end. |