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-rw-r--r--lib/ssh/src/ssh_auth.erl110
1 files changed, 62 insertions, 48 deletions
diff --git a/lib/ssh/src/ssh_auth.erl b/lib/ssh/src/ssh_auth.erl
index 45fd907383..45c4d52d7e 100644
--- a/lib/ssh/src/ssh_auth.erl
+++ b/lib/ssh/src/ssh_auth.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 2008-2013. All Rights Reserved.
+%% Copyright Ericsson AB 2008-2014. 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
@@ -119,8 +119,7 @@ init_userauth_request_msg(#ssh{opts = Opts} = Ssh) ->
false ->
FirstAlg = proplists:get_value(public_key_alg, Opts, ?PREFERRED_PK_ALG),
SecondAlg = other_alg(FirstAlg),
- AllowUserInt = proplists:get_value(user_interaction, Opts, true),
- Prefs = method_preference(FirstAlg, SecondAlg, AllowUserInt),
+ Prefs = method_preference(FirstAlg, SecondAlg),
ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
userauth_preference = Prefs,
userauth_methods = none,
@@ -130,15 +129,13 @@ init_userauth_request_msg(#ssh{opts = Opts} = Ssh) ->
case length(Algs) =:= 2 of
true ->
SecondAlg = other_alg(FirstAlg),
- AllowUserInt = proplists:get_value(user_interaction, Opts, true),
- Prefs = method_preference(FirstAlg, SecondAlg, AllowUserInt),
+ Prefs = method_preference(FirstAlg, SecondAlg),
ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
userauth_preference = Prefs,
userauth_methods = none,
service = "ssh-connection"});
_ ->
- AllowUserInt = proplists:get_value(user_interaction, Opts, true),
- Prefs = method_preference(FirstAlg, AllowUserInt),
+ Prefs = method_preference(FirstAlg),
ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
userauth_preference = Prefs,
userauth_methods = none,
@@ -187,9 +184,8 @@ handle_userauth_request(#ssh_msg_service_request{name =
handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
method = "password",
- data = Data}, _,
+ data = <<?FALSE, ?UINT32(Sz), BinPwd:Sz/binary>>}, _,
#ssh{opts = Opts} = Ssh) ->
- <<_:8, ?UINT32(Sz), BinPwd:Sz/binary>> = Data,
Password = unicode:characters_to_list(BinPwd),
case check_password(User, Password, Opts) of
true ->
@@ -204,6 +200,27 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
+ method = "password",
+ data = <<?TRUE,
+ _/binary
+ %% ?UINT32(Sz1), OldBinPwd:Sz1/binary,
+ %% ?UINT32(Sz2), NewBinPwd:Sz2/binary
+ >>
+ }, _,
+ Ssh) ->
+ %% Password change without us having sent SSH_MSG_USERAUTH_PASSWD_CHANGEREQ (because we never do)
+ %% RFC 4252 says:
+ %% SSH_MSG_USERAUTH_FAILURE without partial success - The password
+ %% has not been changed. Either password changing was not supported,
+ %% or the old password was bad.
+
+ {not_authorized, {User, {error,"Password change not supported"}},
+ ssh_transport:ssh_packet(#ssh_msg_userauth_failure{
+ authentications = "",
+ partial_success = false}, Ssh)};
+
+handle_userauth_request(#ssh_msg_userauth_request{user = User,
+ service = "ssh-connection",
method = "none"}, _,
#ssh{userauth_supported_methods = Methods} = Ssh) ->
{not_authorized, {User, undefined},
@@ -256,15 +273,12 @@ handle_userauth_info_request(
data = Data}, IoCb,
#ssh{opts = Opts} = Ssh) ->
PromptInfos = decode_keyboard_interactive_prompts(NumPrompts,Data),
- Resps = keyboard_interact_get_responses(IoCb, Opts,
+ Responses = keyboard_interact_get_responses(IoCb, Opts,
Name, Instr, PromptInfos),
- RespBin = list_to_binary(
- lists:map(fun(S) -> <<?STRING(list_to_binary(S))>> end,
- Resps)),
{ok,
ssh_transport:ssh_packet(
#ssh_msg_userauth_info_response{num_responses = NumPrompts,
- data = RespBin}, Ssh)}.
+ data = Responses}, Ssh)}.
handle_userauth_info_response(#ssh_msg_userauth_info_response{},
_Auth) ->
@@ -276,25 +290,16 @@ handle_userauth_info_response(#ssh_msg_userauth_info_response{},
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
-method_preference(Alg1, Alg2, true) ->
+method_preference(Alg1, Alg2) ->
[{"publickey", ?MODULE, publickey_msg, [Alg1]},
{"publickey", ?MODULE, publickey_msg,[Alg2]},
{"password", ?MODULE, password_msg, []},
{"keyboard-interactive", ?MODULE, keyboard_interactive_msg, []}
- ];
-method_preference(Alg1, Alg2, false) ->
- [{"publickey", ?MODULE, publickey_msg, [Alg1]},
- {"publickey", ?MODULE, publickey_msg,[Alg2]},
- {"password", ?MODULE, password_msg, []}
].
-method_preference(Alg1, true) ->
+method_preference(Alg1) ->
[{"publickey", ?MODULE, publickey_msg, [Alg1]},
{"password", ?MODULE, password_msg, []},
{"keyboard-interactive", ?MODULE, keyboard_interactive_msg, []}
- ];
-method_preference(Alg1, false) ->
- [{"publickey", ?MODULE, publickey_msg, [Alg1]},
- {"password", ?MODULE, password_msg, []}
].
user_name(Opts) ->
@@ -362,35 +367,29 @@ build_sig_data(SessionId, User, Service, KeyBlob, Alg) ->
algorithm_string('ssh-rsa') ->
"ssh-rsa";
algorithm_string('ssh-dss') ->
- "ssh-dss".
+ "ssh-dss".
decode_keyboard_interactive_prompts(_NumPrompts, Data) ->
ssh_message:decode_keyboard_interactive_prompts(Data, []).
keyboard_interact_get_responses(IoCb, Opts, Name, Instr, PromptInfos) ->
NumPrompts = length(PromptInfos),
- case proplists:get_value(keyboard_interact_fun, Opts) of
- undefined when NumPrompts == 1 ->
- %% Special case/fallback for just one prompt
- %% (assumed to be the password prompt)
- case proplists:get_value(password, Opts) of
- undefined -> keyboard_interact(IoCb, Name, Instr, PromptInfos, Opts);
- PW -> [PW]
- end;
- undefined ->
- keyboard_interact(IoCb, Name, Instr, PromptInfos, Opts);
- KbdInteractFun ->
- Prompts = lists:map(fun({Prompt, _Echo}) -> Prompt end,
- PromptInfos),
- case KbdInteractFun(Name, Instr, Prompts) of
- Rs when length(Rs) == NumPrompts ->
- Rs;
- Rs ->
- erlang:error({mismatching_number_of_responses,
- {got,Rs},
- {expected,NumPrompts}})
- end
- end.
+ keyboard_interact_get_responses(proplists:get_value(user_interaction, Opts, true),
+ proplists:get_value(keyboard_interact_fun, Opts),
+ proplists:get_value(password, Opts, undefined), IoCb, Name,
+ Instr, PromptInfos, Opts, NumPrompts).
+
+keyboard_interact_get_responses(_, undefined, Password, _, _, _, _, _,
+ 1) when Password =/= undefined ->
+ [Password]; %% Password auth implemented with keyboard-interaction and passwd is known
+keyboard_interact_get_responses(_, _, _, _, _, _, _, _, 0) ->
+ [""];
+keyboard_interact_get_responses(false, undefined, undefined, _, _, _, [Prompt|_], Opts, _) ->
+ ssh_no_io:read_line(Prompt, Opts); %% Throws error as keyboard interaction is not allowed
+keyboard_interact_get_responses(true, undefined, _,IoCb, Name, Instr, PromptInfos, Opts, _) ->
+ keyboard_interact(IoCb, Name, Instr, PromptInfos, Opts);
+keyboard_interact_get_responses(true, Fun, _, Name, Instr, PromptInfos, _, _, NumPrompts) ->
+ keyboard_interact_fun(Fun, Name, Instr, PromptInfos, NumPrompts).
keyboard_interact(IoCb, Name, Instr, Prompts, Opts) ->
if Name /= "" -> IoCb:format("~s", [Name]);
@@ -404,6 +403,21 @@ keyboard_interact(IoCb, Name, Instr, Prompts, Opts) ->
end,
Prompts).
+keyboard_interact_fun(KbdInteractFun, Name, Instr, PromptInfos, NumPrompts) ->
+ Prompts = lists:map(fun({Prompt, _Echo}) -> Prompt end,
+ PromptInfos),
+ case KbdInteractFun(Name, Instr, Prompts) of
+ Rs when length(Rs) == NumPrompts ->
+ Rs;
+ Rs ->
+ throw({mismatching_number_of_responses,
+ {got,Rs},
+ {expected, NumPrompts},
+ #ssh_msg_disconnect{code = ?SSH_DISCONNECT_SERVICE_NOT_AVAILABLE,
+ description = "User interaction failed",
+ language = "en"}})
+ end.
+
other_alg('ssh-rsa') ->
'ssh-dss';
other_alg('ssh-dss') ->