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-rw-r--r--lib/ssh/src/ssh.hrl6
-rw-r--r--lib/ssh/src/ssh_auth.erl146
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl31
3 files changed, 105 insertions, 78 deletions
diff --git a/lib/ssh/src/ssh.hrl b/lib/ssh/src/ssh.hrl
index 94154c8a96..a02c87505d 100644
--- a/lib/ssh/src/ssh.hrl
+++ b/lib/ssh/src/ssh.hrl
@@ -128,8 +128,10 @@
user,
service,
userauth_quiet_mode, % boolean()
- userauth_supported_methods , %
- userauth_methods,
+ userauth_supported_methods, % string() eg "keyboard-interactive,password"
+ userauth_methods, % list( string() ) eg ["keyboard-interactive", "password"]
+ kb_tries_left = 0, % integer(), num tries left for "keyboard-interactive"
+ kb_data,
userauth_preference,
available_host_keys,
authenticated = false
diff --git a/lib/ssh/src/ssh_auth.erl b/lib/ssh/src/ssh_auth.erl
index df9a97c8f8..58faee062e 100644
--- a/lib/ssh/src/ssh_auth.erl
+++ b/lib/ssh/src/ssh_auth.erl
@@ -169,7 +169,8 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
method = "password",
data = <<?FALSE, ?UINT32(Sz), BinPwd:Sz/binary>>}, _,
- #ssh{opts = Opts} = Ssh) ->
+ #ssh{opts = Opts,
+ userauth_supported_methods = Methods} = Ssh) ->
Password = unicode:characters_to_list(BinPwd),
case check_password(User, Password, Opts) of
true ->
@@ -178,7 +179,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
false ->
{not_authorized, {User, {error,"Bad user or password"}},
ssh_transport:ssh_packet(#ssh_msg_userauth_failure{
- authentications = "",
+ authentications = Methods,
partial_success = false}, Ssh)}
end;
@@ -191,7 +192,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
%% ?UINT32(Sz2), NewBinPwd:Sz2/binary
>>
}, _,
- Ssh) ->
+ #ssh{userauth_supported_methods = Methods} = 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
@@ -200,7 +201,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
{not_authorized, {User, {error,"Password change not supported"}},
ssh_transport:ssh_packet(#ssh_msg_userauth_failure{
- authentications = "",
+ authentications = Methods,
partial_success = false}, Ssh)};
handle_userauth_request(#ssh_msg_userauth_request{user = User,
@@ -216,7 +217,9 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
method = "publickey",
data = Data},
- SessionId, #ssh{opts = Opts} = Ssh) ->
+ SessionId,
+ #ssh{opts = Opts,
+ userauth_supported_methods = Methods} = Ssh) ->
<<?BYTE(HaveSig), ?UINT32(ALen), BAlg:ALen/binary,
?UINT32(KLen), KeyBlob:KLen/binary, SigWLen/binary>> = Data,
Alg = binary_to_list(BAlg),
@@ -231,7 +234,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
false ->
{not_authorized, {User, undefined},
ssh_transport:ssh_packet(#ssh_msg_userauth_failure{
- authentications="publickey,password",
+ authentications = Methods,
partial_success = false}, Ssh)}
end;
?FALSE ->
@@ -245,49 +248,60 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
method = "keyboard-interactive",
data = _},
- _, #ssh{opts = Opts} = Ssh) ->
- %% RFC4256
- %% The data field contains:
- %% - language tag (deprecated). If =/=[] SHOULD use it however. We skip
- %% it for simplicity.
- %% - submethods. "... the user can give a hint of which actual methods
- %% he wants to use. ...". It's a "MAY use" so we skip
- %% it. It also needs an understanding between the client
- %% and the server.
- %%
- %% "The server MUST reply with an SSH_MSG_USERAUTH_SUCCESS,
- %% SSH_MSG_USERAUTH_FAILURE, or SSH_MSG_USERAUTH_INFO_REQUEST message."
- Default = {"SSH server",
- "Enter password for \""++User++"\"",
- "pwd: ",
- false},
-
- {Name, Instruction, Prompt, Echo} =
- case proplists:get_value(auth_method_kb_interactive_data, Opts) of
- undefined ->
- Default;
- {_,_,_,_}=V ->
- V;
- F when is_function(F) ->
- {_,PeerName} = Ssh#ssh.peer,
- F(PeerName, User, "ssh-connection")
- end,
- EchoEnc = case Echo of
- true -> <<?TRUE>>;
- false -> <<?FALSE>>
- end,
- Msg = #ssh_msg_userauth_info_request{name = unicode:characters_to_list(Name),
- instruction = unicode:characters_to_list(Instruction),
- language_tag = "",
- num_prompts = 1,
- data = <<?STRING(unicode:characters_to_binary(Prompt)),
- EchoEnc/binary
- >>
- },
- {not_authorized, {User, undefined},
- ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
- opts = [{max_kb_tries,3},{kb_userauth_info_msg,Msg}|Opts]
- })};
+ _, #ssh{opts = Opts,
+ kb_tries_left = KbTriesLeft,
+ userauth_supported_methods = Methods} = Ssh) ->
+ case KbTriesLeft of
+ N when N<1 ->
+ {not_authorized, {User, {authmethod, "keyboard-interactive"}},
+ ssh_transport:ssh_packet(
+ #ssh_msg_userauth_failure{authentications = Methods,
+ partial_success = false}, Ssh)};
+
+ _ ->
+ %% RFC4256
+ %% The data field contains:
+ %% - language tag (deprecated). If =/=[] SHOULD use it however. We skip
+ %% it for simplicity.
+ %% - submethods. "... the user can give a hint of which actual methods
+ %% he wants to use. ...". It's a "MAY use" so we skip
+ %% it. It also needs an understanding between the client
+ %% and the server.
+ %%
+ %% "The server MUST reply with an SSH_MSG_USERAUTH_SUCCESS,
+ %% SSH_MSG_USERAUTH_FAILURE, or SSH_MSG_USERAUTH_INFO_REQUEST message."
+ Default = {"SSH server",
+ "Enter password for \""++User++"\"",
+ "password: ",
+ false},
+
+ {Name, Instruction, Prompt, Echo} =
+ case proplists:get_value(auth_method_kb_interactive_data, Opts) of
+ undefined ->
+ Default;
+ {_,_,_,_}=V ->
+ V;
+ F when is_function(F) ->
+ {_,PeerName} = Ssh#ssh.peer,
+ F(PeerName, User, "ssh-connection")
+ end,
+ EchoEnc = case Echo of
+ true -> <<?TRUE>>;
+ false -> <<?FALSE>>
+ end,
+ Msg = #ssh_msg_userauth_info_request{name = unicode:characters_to_list(Name),
+ instruction = unicode:characters_to_list(Instruction),
+ language_tag = "",
+ num_prompts = 1,
+ data = <<?STRING(unicode:characters_to_binary(Prompt)),
+ EchoEnc/binary
+ >>
+ },
+ {not_authorized, {User, undefined},
+ ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
+ kb_data = Msg
+ })}
+ end;
handle_userauth_request(#ssh_msg_userauth_request{user = User,
service = "ssh-connection",
@@ -314,33 +328,37 @@ handle_userauth_info_request(
handle_userauth_info_response(#ssh_msg_userauth_info_response{num_responses = 1,
data = <<?UINT32(Sz), Password:Sz/binary>>},
- #ssh{opts = Opts0,
- user = User} = Ssh) ->
- NumTriesLeft = proplists:get_value(max_kb_tries, Opts0, 0) - 1,
- Opts = lists:keydelete(max_kb_tries,1,Opts0),
+ #ssh{opts = Opts,
+ kb_tries_left = KbTriesLeft0,
+ kb_data = InfoMsg,
+ user = User,
+ userauth_supported_methods = Methods} = Ssh) ->
+ KbTriesLeft = KbTriesLeft0 - 1,
case check_password(User, unicode:characters_to_list(Password), Opts) of
true ->
{authorized, User,
ssh_transport:ssh_packet(#ssh_msg_userauth_success{}, Ssh)};
- false when NumTriesLeft > 0 ->
+ false when KbTriesLeft > 0 ->
UserAuthInfoMsg =
- (proplists:get_value(kb_userauth_info_msg,Opts))
- #ssh_msg_userauth_info_request{name = "",
- instruction =
- lists:concat(
- ["Bad user or password, try again. ",
- integer_to_list(NumTriesLeft),
- " tries left."])},
+ InfoMsg#ssh_msg_userauth_info_request{
+ name = "",
+ instruction =
+ lists:concat(
+ ["Bad user or password, try again. ",
+ integer_to_list(KbTriesLeft),
+ " tries left."])
+ },
{not_authorized, {User, undefined},
ssh_transport:ssh_packet(UserAuthInfoMsg,
- Ssh#ssh{opts = [{max_kb_tries,NumTriesLeft}|Opts]})};
+ Ssh#ssh{kb_tries_left = KbTriesLeft})};
false ->
{not_authorized, {User, {error,"Bad user or password"}},
ssh_transport:ssh_packet(#ssh_msg_userauth_failure{
- authentications = "",
+ authentications = Methods,
partial_success = false},
- Ssh#ssh{opts = lists:keydelete(kb_userauth_info_msg,1,Opts)}
+ Ssh#ssh{kb_data = undefined,
+ kb_tries_left = 0}
)}
end;
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index ab1fc93a1b..d8bf66d2a8 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -483,17 +483,22 @@ userauth(#ssh_msg_userauth_request{service = "ssh-connection",
service = "ssh-connection",
peer = {_, Address}} = Ssh0,
opts = Opts, starter = Pid} = State) ->
- case ssh_auth:handle_userauth_request(Msg, SessionId, Ssh0) of
- {authorized, User, {Reply, Ssh}} ->
- send_msg(Reply, State),
- Pid ! ssh_connected,
- connected_fun(User, Address, Method, Opts),
- {next_state, connected,
- next_packet(State#state{auth_user = User, ssh_params = Ssh})};
- {not_authorized, {User, Reason}, {Reply, Ssh}} ->
- retry_fun(User, Address, Reason, Opts),
- send_msg(Reply, State),
- {next_state, userauth, next_packet(State#state{ssh_params = Ssh})}
+ case lists:member(Method, Ssh0#ssh.userauth_methods) of
+ true ->
+ case ssh_auth:handle_userauth_request(Msg, SessionId, Ssh0) of
+ {authorized, User, {Reply, Ssh}} ->
+ send_msg(Reply, State),
+ Pid ! ssh_connected,
+ connected_fun(User, Address, Method, Opts),
+ {next_state, connected,
+ next_packet(State#state{auth_user = User, ssh_params = Ssh})};
+ {not_authorized, {User, Reason}, {Reply, Ssh}} ->
+ retry_fun(User, Address, Reason, Opts),
+ send_msg(Reply, State),
+ {next_state, userauth, next_packet(State#state{ssh_params = Ssh})}
+ end;
+ false ->
+ userauth(Msg#ssh_msg_userauth_request{method="none"}, State)
end;
userauth(#ssh_msg_userauth_info_request{} = Msg,
@@ -1148,9 +1153,9 @@ init_ssh(client = Role, Vsn, Version, Options, Socket) ->
};
init_ssh(server = Role, Vsn, Version, Options, Socket) ->
-
AuthMethods = proplists:get_value(auth_methods, Options,
?SUPPORTED_AUTH_METHODS),
+ AuthMethodsAsList = string:tokens(AuthMethods, ","),
{ok, PeerAddr} = inet:peername(Socket),
KeyCb = proplists:get_value(key_cb, Options, ssh_file),
@@ -1161,6 +1166,8 @@ init_ssh(server = Role, Vsn, Version, Options, Socket) ->
io_cb = proplists:get_value(io_cb, Options, ssh_io),
opts = Options,
userauth_supported_methods = AuthMethods,
+ userauth_methods = AuthMethodsAsList,
+ kb_tries_left = 3,
peer = {undefined, PeerAddr},
available_host_keys = supported_host_keys(Role, KeyCb, Options)
}.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 04:04:35 +0000