%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2004-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(ssh).
-include("ssh.hrl").
-include("ssh_connect.hrl").
-include_lib("public_key/include/public_key.hrl").
-export([start/0, start/1, stop/0, connect/3, connect/4, close/1, connection_info/2,
channel_info/3,
daemon/1, daemon/2, daemon/3,
stop_listener/1, stop_listener/2, stop_daemon/1, stop_daemon/2,
shell/1, shell/2, shell/3]).
-deprecated({sign_data, 2, next_major_release}).
-deprecated({verify_data, 3, next_major_release}).
-export([sign_data/2, verify_data/3]).
%%--------------------------------------------------------------------
%% Function: start([, Type]) -> ok
%%
%% Type = permanent | transient | temporary
%%
%% Description: Starts the ssh application. Default type
%% is temporary. see application(3)
%%--------------------------------------------------------------------
start() ->
application:start(crypto),
application:start(public_key),
application:start(ssh).
start(Type) ->
application:start(crypto, Type),
application:start(public_key, Type),
application:start(ssh, Type).
%%--------------------------------------------------------------------
%% Function: stop() -> ok
%%
%% Description: Stops the ssh application.
%%--------------------------------------------------------------------
stop() ->
application:stop(ssh).
%%--------------------------------------------------------------------
%% Function: connect(Host, Port, Options) ->
%% connect(Host, Port, Options, Timeout -> ConnectionRef | {error, Reason}
%%
%% Host - string()
%% Port - integer()
%% Options - [{Option, Value}]
%% Timeout - infinity | integer().
%%
%% Description: Starts an ssh connection.
%%--------------------------------------------------------------------
connect(Host, Port, Options) ->
connect(Host, Port, Options, infinity).
connect(Host, Port, Options, Timeout) ->
case handle_options(Options) of
{error, _Reason} = Error ->
Error;
{SocketOptions, SshOptions} ->
DisableIpv6 = proplists:get_value(ipv6_disabled, SshOptions, false),
Inet = inetopt(DisableIpv6),
do_connect(Host, Port, [Inet | SocketOptions],
[{user_pid, self()}, {host, Host} | fix_idle_time(SshOptions)], Timeout, DisableIpv6)
end.
do_connect(Host, Port, SocketOptions, SshOptions, Timeout, DisableIpv6) ->
try sshc_sup:start_child([[{address, Host}, {port, Port},
{role, client},
{channel_pid, self()},
{socket_opts, SocketOptions},
{ssh_opts, SshOptions}]]) of
{ok, ConnectionSup} ->
{ok, Manager} =
ssh_connection_sup:connection_manager(ConnectionSup),
msg_loop(Manager, DisableIpv6, Host, Port, SocketOptions, SshOptions, Timeout)
catch
exit:{noproc, _} ->
{error, ssh_not_started}
end.
msg_loop(Manager, DisableIpv6, Host, Port, SocketOptions, SshOptions, Timeout) ->
receive
{Manager, is_connected} ->
{ok, Manager};
%% When the connection fails
%% ssh_connection_sup:connection_manager
%% might return undefined as the connection manager
%% could allready have terminated, so we will not
%% match the Manager in this case
{_, not_connected, {error, econnrefused}} when DisableIpv6 == false ->
do_connect(Host, Port, proplists:delete(inet6, SocketOptions),
SshOptions, Timeout, true);
{_, not_connected, {error, Reason}} ->
{error, Reason};
{_, not_connected, Other} ->
{error, Other};
{From, user_password} ->
Pass = io:get_password(),
From ! Pass,
msg_loop(Manager, DisableIpv6, Host, Port, SocketOptions, SshOptions, Timeout);
{From, question} ->
Answer = io:get_line(""),
From ! Answer,
msg_loop(Manager, DisableIpv6, Host, Port, SocketOptions, SshOptions, Timeout)
after Timeout ->
ssh_connection_manager:stop(Manager),
{error, timeout}
end.
%%--------------------------------------------------------------------
%% Function: close(ConnectionRef) -> ok
%%
%% Description: Closes an ssh connection.
%%--------------------------------------------------------------------
close(ConnectionRef) ->
ssh_connection_manager:stop(ConnectionRef).
%%--------------------------------------------------------------------
%% Function: connection_info(ConnectionRef) -> [{Option, Value}]
%%
%% Description: Retrieves information about a connection.
%%--------------------------------------------------------------------
connection_info(ConnectionRef, Options) ->
ssh_connection_manager:connection_info(ConnectionRef, Options).
%%--------------------------------------------------------------------
%% Function: channel_info(ConnectionRef) -> [{Option, Value}]
%%
%% Description: Retrieves information about a connection.
%%--------------------------------------------------------------------
channel_info(ConnectionRef, ChannelId, Options) ->
ssh_connection_manager:channel_info(ConnectionRef, ChannelId, Options).
%%--------------------------------------------------------------------
%% Function: daemon(Port) ->
%% daemon(Port, Options) ->
%% daemon(Address, Port, Options) -> SshSystemRef
%%
%% Description: Starts a server listening for SSH connections
%% on the given port.
%%--------------------------------------------------------------------
daemon(Port) ->
daemon(Port, []).
daemon(Port, Options) ->
daemon(any, Port, Options).
daemon(HostAddr, Port, Options0) ->
Options1 = case proplists:get_value(shell, Options0) of
undefined ->
[{shell, {shell, start, []}} | Options0];
_ ->
Options0
end,
DisableIpv6 = proplists:get_value(ipv6_disabled, Options0, false),
{Host, Inet, Options} = case HostAddr of
any ->
{ok, Host0} = inet:gethostname(),
{Host0, inetopt(DisableIpv6), Options1};
{_,_,_,_} ->
{HostAddr, inet,
[{ip, HostAddr} | Options1]};
{_,_,_,_,_,_,_,_} ->
{HostAddr, inet6,
[{ip, HostAddr} | Options1]}
end,
start_daemon(Host, Port, Options, Inet).
%%--------------------------------------------------------------------
%% Function: stop_listener(SysRef) -> ok
%% stop_listener(Address, Port) -> ok
%%
%%
%% Description: Stops the listener, but leaves
%% existing connections started by the listener up and running.
%%--------------------------------------------------------------------
stop_listener(SysSup) ->
ssh_system_sup:stop_listener(SysSup).
stop_listener(Address, Port) ->
ssh_system_sup:stop_listener(Address, Port).
%%--------------------------------------------------------------------
%% Function: stop_daemon(SysRef) -> ok
%%% stop_daemon(Address, Port) -> ok
%%
%%
%% Description: Stops the listener and all connections started by
%% the listener.
%%--------------------------------------------------------------------
stop_daemon(SysSup) ->
ssh_system_sup:stop_system(SysSup).
stop_daemon(Address, Port) ->
ssh_system_sup:stop_system(Address, Port).
%%--------------------------------------------------------------------
%% Function: shell(Host [,Port,Options]) -> {ok, ConnectionRef} |
%% {error, Reason}
%%
%% Host = string()
%% Port = integer()
%% Options = [{Option, Value}]
%%
%% Description: Starts an interactive shell to an SSH server on the
%% given <Host>. The function waits for user input,
%% and will not return until the remote shell is ended.(e.g. on
%% exit from the shell)
%%--------------------------------------------------------------------
shell(Host) ->
shell(Host, ?SSH_DEFAULT_PORT, []).
shell(Host, Options) ->
shell(Host, ?SSH_DEFAULT_PORT, Options).
shell(Host, Port, Options) ->
case connect(Host, Port, Options) of
{ok, ConnectionRef} ->
case ssh_connection:session_channel(ConnectionRef, infinity) of
{ok,ChannelId} ->
Args = [{channel_cb, ssh_shell},
{init_args,[ConnectionRef, ChannelId]},
{cm, ConnectionRef}, {channel_id, ChannelId}],
{ok, State} = ssh_channel:init([Args]),
ssh_channel:enter_loop(State);
Error ->
Error
end;
Error ->
Error
end.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
fix_idle_time(SshOptions) ->
case proplists:get_value(idle_time, SshOptions) of
undefined ->
[{idle_time, infinity}|SshOptions];
_ ->
SshOptions
end.
start_daemon(Host, Port, Options, Inet) ->
case handle_options(Options) of
{error, _Reason} = Error ->
Error;
{SocketOptions, SshOptions}->
do_start_daemon(Host, Port,[{role, server} |SshOptions] , [Inet | SocketOptions])
end.
do_start_daemon(Host, Port, Options, SocketOptions) ->
case ssh_system_sup:system_supervisor(Host, Port) of
undefined ->
%% It would proably make more sense to call the
%% address option host but that is a too big change at the
%% monent. The name is a legacy name!
try sshd_sup:start_child([{address, Host},
{port, Port}, {role, server},
{socket_opts, SocketOptions},
{ssh_opts, Options}]) of
{ok, SysSup} ->
{ok, SysSup};
{error, {already_started, _}} ->
{error, eaddrinuse};
{error, R} ->
{error, R}
catch
exit:{noproc, _} ->
{error, ssh_not_started}
end;
Sup ->
case ssh_system_sup:restart_acceptor(Host, Port) of
{ok, _} ->
{ok, Sup};
_ ->
{error, eaddrinuse}
end
end.
handle_options(Opts) ->
try handle_option(proplists:unfold(Opts), [], []) of
{_,_} = Options ->
Options
catch
throw:Error ->
Error
end.
handle_option([], SocketOptions, SshOptions) ->
{SocketOptions, SshOptions};
handle_option([{system_dir, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{user_dir, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{user_dir_fun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{silently_accept_hosts, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{user_interaction, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{public_key_alg, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{connect_timeout, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{user, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{dsa_pass_phrase, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{rsa_pass_phrase, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{password, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{user_passwords, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{pwdfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{key_cb, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{role, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{compression, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
%%Backwards compatibility
handle_option([{allow_user_interaction, Value} | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option({user_interaction, Value}) | SshOptions]);
handle_option([{infofun, _} = Opt | Rest],SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{connectfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{disconnectfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{failfun, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
%%Backwards compatibility should not be underscore between ip and v6 in API
handle_option([{ip_v6_disabled, Value} | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option({ipv6_disabled, Value}) | SshOptions]);
handle_option([{ipv6_disabled, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{transport, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{subsystems, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{ssh_cli, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{shell, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{exec, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{auth_methods, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{pref_public_key_algs, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{quiet_mode, _} = Opt|Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{idle_time, _} = Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([{rekey_limit, _} = Opt|Rest], SocketOptions, SshOptions) ->
handle_option(Rest, SocketOptions, [handle_ssh_option(Opt) | SshOptions]);
handle_option([Opt | Rest], SocketOptions, SshOptions) ->
handle_option(Rest, [handle_inet_option(Opt) | SocketOptions], SshOptions).
handle_ssh_option({system_dir, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({user_dir, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({user_dir_fun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({silently_accept_hosts, Value} = Opt) when Value == true; Value == false ->
Opt;
handle_ssh_option({user_interaction, Value} = Opt) when Value == true; Value == false ->
Opt;
handle_ssh_option({public_key_alg, ssh_dsa}) ->
{public_key_alg, 'ssh-dss'};
handle_ssh_option({public_key_alg, ssh_rsa}) ->
{public_key_alg, 'ssh-rsa'};
handle_ssh_option({public_key_alg, Value} = Opt) when Value == 'ssh-rsa'; Value == 'ssh-dss' ->
Opt;
handle_ssh_option({pref_public_key_algs, Value} = Opt) when is_list(Value), length(Value) >= 1 ->
case handle_pref_algs(Value, []) of
{true, NewOpts} ->
NewOpts;
_ ->
throw({error, {eoptions, Opt}})
end;
handle_ssh_option({connect_timeout, Value} = Opt) when is_integer(Value); Value == infinity ->
Opt;
handle_ssh_option({user, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({dsa_pass_phrase, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({rsa_pass_phrase, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({password, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({user_passwords, Value} = Opt) when is_list(Value)->
Opt;
handle_ssh_option({pwdfun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({key_cb, Value} = Opt) when is_atom(Value) ->
Opt;
handle_ssh_option({compression, Value} = Opt) when is_atom(Value) ->
Opt;
handle_ssh_option({exec, {Module, Function, _}} = Opt) when is_atom(Module),
is_atom(Function) ->
Opt;
handle_ssh_option({auth_methods, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({infofun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({connectfun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({disconnectfun , Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({failfun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({ipv6_disabled, Value} = Opt) when Value == true;
Value == false ->
Opt;
handle_ssh_option({transport, {Protocol, Cb, ClosTag}} = Opt) when is_atom(Protocol),
is_atom(Cb),
is_atom(ClosTag) ->
Opt;
handle_ssh_option({subsystems, Value} = Opt) when is_list(Value) ->
Opt;
handle_ssh_option({ssh_cli, {Cb, _}}= Opt) when is_atom(Cb) ->
Opt;
handle_ssh_option({shell, {Module, Function, _}} = Opt) when is_atom(Module),
is_atom(Function) ->
Opt;
handle_ssh_option({shell, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({quiet_mode, Value} = Opt) when Value == true;
Value == false ->
Opt;
handle_ssh_option({idle_time, Value} = Opt) when is_integer(Value), Value > 0 ->
Opt;
handle_ssh_option({rekey_limit, Value} = Opt) when is_integer(Value) ->
Opt;
handle_ssh_option(Opt) ->
throw({error, {eoptions, Opt}}).
handle_inet_option({active, _} = Opt) ->
throw({error, {{eoptions, Opt}, "Ssh has built in flow control, "
"and activ is handled internaly user is not allowd"
"to specify this option"}});
handle_inet_option({inet, _} = Opt) ->
throw({error, {{eoptions, Opt},"Is set internaly use ipv6_disabled to"
" enforce iv4 in the server, client will fallback to ipv4 if"
" it can not use ipv6"}});
handle_inet_option({reuseaddr, _} = Opt) ->
throw({error, {{eoptions, Opt},"Is set internaly user is not allowd"
"to specify this option"}});
%% Option verified by inet
handle_inet_option(Opt) ->
Opt.
%% Check preferred algs
handle_pref_algs([], Acc) ->
{true, lists:reverse(Acc)};
handle_pref_algs([H|T], Acc) ->
case H of
ssh_dsa ->
handle_pref_algs(T, ['ssh-dss'| Acc]);
ssh_rsa ->
handle_pref_algs(T, ['ssh-rsa'| Acc]);
'ssh-dss' ->
handle_pref_algs(T, ['ssh-dss'| Acc]);
'ssh-rsa' ->
handle_pref_algs(T, ['ssh-rsa'| Acc]);
_ ->
false
end.
%% Has IPv6 been disabled?
inetopt(true) ->
inet;
inetopt(false) ->
case gen_tcp:listen(0, [inet6]) of
{ok, Dummyport} ->
gen_tcp:close(Dummyport),
inet6;
_ ->
inet
end.
%%%
%% Deprecated
%%%
%%--------------------------------------------------------------------
%% Function: sign_data(Data, Algorithm) -> binary() |
%% {error, Reason}
%%
%% Data = binary()
%% Algorithm = "ssh-rsa"
%%
%% Description: Use SSH key to sign data.
%%--------------------------------------------------------------------
sign_data(Data, Algorithm) when is_binary(Data) ->
case ssh_file:user_key(Algorithm,[]) of
{ok, Key} when Algorithm == "ssh-rsa" ->
public_key:sign(Data, sha, Key);
Error ->
Error
end.
%%--------------------------------------------------------------------
%% Function: verify_data(Data, Signature, Algorithm) -> ok |
%% {error, Reason}
%%
%% Data = binary()
%% Signature = binary()
%% Algorithm = "ssh-rsa"
%%
%% Description: Use SSH signature to verify data.
%%--------------------------------------------------------------------
verify_data(Data, Signature, Algorithm) when is_binary(Data), is_binary(Signature) ->
case ssh_file:user_key(Algorithm, []) of
{ok, #'RSAPrivateKey'{publicExponent = E, modulus = N}} when Algorithm == "ssh-rsa" ->
public_key:verify(Data, sha, Signature, #'RSAPublicKey'{publicExponent = E, modulus = N});
Error ->
Error
end.
