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-rw-r--r--lib/ssh/src/ssh_auth.erl59
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl88
2 files changed, 95 insertions, 52 deletions
diff --git a/lib/ssh/src/ssh_auth.erl b/lib/ssh/src/ssh_auth.erl
index 6cf659f830..ac64a7bf14 100644
--- a/lib/ssh/src/ssh_auth.erl
+++ b/lib/ssh/src/ssh_auth.erl
@@ -28,7 +28,8 @@
-include("ssh_auth.hrl").
-include("ssh_transport.hrl").
--export([publickey_msg/1, password_msg/1, keyboard_interactive_msg/1,
+-export([get_public_key/2,
+ publickey_msg/1, password_msg/1, keyboard_interactive_msg/1,
service_request_msg/1, init_userauth_request_msg/1,
userauth_request_msg/1, handle_userauth_request/3,
handle_userauth_info_request/2, handle_userauth_info_response/2
@@ -136,41 +137,49 @@ keyboard_interactive_msg([#ssh{user = User,
Ssh)
end.
-publickey_msg([SigAlg, #ssh{user = User,
- session_id = SessionId,
- service = Service,
- opts = Opts} = Ssh]) ->
- Hash = ssh_transport:sha(SigAlg),
+
+get_public_key(SigAlg, #ssh{opts = Opts}) ->
KeyAlg = key_alg(SigAlg),
{KeyCb,KeyCbOpts} = ?GET_OPT(key_cb, Opts),
UserOpts = ?GET_OPT(user_options, Opts),
case KeyCb:user_key(KeyAlg, [{key_cb_private,KeyCbOpts}|UserOpts]) of
- {ok, PrivKey} ->
- SigAlgStr = atom_to_list(SigAlg),
+ {ok, PrivKey} ->
try
Key = ssh_transport:extract_public_key(PrivKey),
public_key:ssh_encode(Key, ssh2_pubkey)
of
- PubKeyBlob ->
- SigData = build_sig_data(SessionId, User, Service,
- PubKeyBlob, SigAlgStr),
- Sig = ssh_transport:sign(SigData, Hash, PrivKey),
- SigBlob = list_to_binary([?string(SigAlgStr),
- ?binary(Sig)]),
- ssh_transport:ssh_packet(
- #ssh_msg_userauth_request{user = User,
- service = Service,
- method = "publickey",
- data = [?TRUE,
- ?string(SigAlgStr),
- ?binary(PubKeyBlob),
- ?binary(SigBlob)]},
- Ssh)
+ PubKeyBlob -> {ok,{PrivKey,PubKeyBlob}}
catch
_:_ ->
- {not_ok, Ssh}
+ not_ok
end;
- _Error ->
+ _Error ->
+ not_ok
+ end.
+
+
+publickey_msg([SigAlg, #ssh{user = User,
+ session_id = SessionId,
+ service = Service} = Ssh]) ->
+ case get_public_key(SigAlg, Ssh) of
+ {ok, {PrivKey,PubKeyBlob}} ->
+ SigAlgStr = atom_to_list(SigAlg),
+ SigData = build_sig_data(SessionId, User, Service,
+ PubKeyBlob, SigAlgStr),
+ Hash = ssh_transport:sha(SigAlg),
+ Sig = ssh_transport:sign(SigData, Hash, PrivKey),
+ SigBlob = list_to_binary([?string(SigAlgStr),
+ ?binary(Sig)]),
+ ssh_transport:ssh_packet(
+ #ssh_msg_userauth_request{user = User,
+ service = Service,
+ method = "publickey",
+ data = [?TRUE,
+ ?string(SigAlgStr),
+ ?binary(PubKeyBlob),
+ ?binary(SigBlob)]},
+ Ssh);
+ _ ->
{not_ok, Ssh}
end.
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index f1ce337947..4c6aff5c24 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -453,16 +453,20 @@ init_ssh_record(Role, _Socket, PeerAddr, Opts) ->
PeerName0 when is_list(PeerName0) ->
PeerName0
end,
- S0#ssh{c_vsn = Vsn,
- c_version = Version,
- io_cb = case ?GET_OPT(user_interaction, Opts) of
- true -> ssh_io;
- false -> ssh_no_io
- end,
- userauth_pubkeys = ?GET_OPT(pref_public_key_algs, Opts),
- userauth_quiet_mode = ?GET_OPT(quiet_mode, Opts),
- peer = {PeerName, PeerAddr}
- };
+ S1 =
+ S0#ssh{c_vsn = Vsn,
+ c_version = Version,
+ io_cb = case ?GET_OPT(user_interaction, Opts) of
+ true -> ssh_io;
+ false -> ssh_no_io
+ end,
+ userauth_quiet_mode = ?GET_OPT(quiet_mode, Opts),
+ peer = {PeerName, PeerAddr}
+ },
+ S1#ssh{userauth_pubkeys = [K || K <- ?GET_OPT(pref_public_key_algs, Opts),
+ is_usable_user_pubkey(K, S1)
+ ]
+ };
server ->
S0#ssh{s_vsn = Vsn,
@@ -1700,29 +1704,59 @@ handle_ssh_msg_ext_info(#ssh_msg_ext_info{data=Data}, D0) ->
lists:foldl(fun ext_info/2, D0, Data).
-ext_info({"server-sig-algs",SigAlgs}, D0 = #data{ssh_params=#ssh{role=client,
- userauth_pubkeys=ClientSigAlgs}=Ssh0}) ->
- %% Make strings to eliminate risk of beeing bombed with odd strings that fills the atom table:
- SupportedAlgs = lists:map(fun erlang:atom_to_list/1, ssh_transport:supported_algorithms(public_key)),
- ServerSigAlgs = [list_to_atom(SigAlg) || SigAlg <- string:tokens(SigAlgs,","),
- %% length of SigAlg is implicitly checked by the comparison
- %% in member/2:
- lists:member(SigAlg, SupportedAlgs)
- ],
- CommonAlgs = [Alg || Alg <- ServerSigAlgs,
- lists:member(Alg, ClientSigAlgs)],
- SelectedAlgs =
- case CommonAlgs of
- [] -> ClientSigAlgs; % server-sig-algs value is just an advice
- _ -> CommonAlgs
- end,
- D0#data{ssh_params = Ssh0#ssh{userauth_pubkeys = SelectedAlgs} };
+ext_info({"server-sig-algs",SigAlgsStr},
+ D0 = #data{ssh_params=#ssh{role=client,
+ userauth_pubkeys=ClientSigAlgs}=Ssh0}) ->
+ %% ClientSigAlgs are the pub_key algortithms that:
+ %% 1) is usable, that is, the user has such a public key and
+ %% 2) is either the default list or set by the caller
+ %% with the client option 'pref_public_key_algs'
+ %%
+ %% The list is already checked for duplicates.
+
+ SigAlgs = [A || Astr <- string:tokens(SigAlgsStr, ","),
+ A <- try [list_to_existing_atom(Astr)]
+ %% list_to_existing_atom will fail for unknown algorithms
+ catch _:_ -> []
+ end],
+
+ CommonAlgs = [A || A <- SigAlgs,
+ lists:member(A, ClientSigAlgs)],
+
+ %% Re-arrange the client supported public-key algorithms so that the server
+ %% preferred ones are tried first.
+ %% Trying algorithms not mentioned by the server is ok, since the server can't know
+ %% if the client supports 'server-sig-algs' or not.
+
+ D0#data{
+ ssh_params =
+ Ssh0#ssh{
+ userauth_pubkeys =
+ CommonAlgs ++ (ClientSigAlgs -- CommonAlgs)
+ }};
+
+ %% If there are algorithms common to the client and the server, use them.
+ %% Otherwise try with ones that the client supports. The server-sig-alg
+ %% list is a suggestion, not an order.
+ %% case CommonAlgs of
+ %% [_|_] ->
+ %% D0#data{ssh_params = Ssh0#ssh{userauth_pubkeys = CommonAlgs}};
+ %% [] ->
+ %% D0
+ %% end;
ext_info(_, D0) ->
%% Not implemented
D0.
%%%----------------------------------------------------------------
+is_usable_user_pubkey(A, Ssh) ->
+ case ssh_auth:get_public_key(A, Ssh) of
+ {ok,_} -> true;
+ _ -> false
+ end.
+
+%%%----------------------------------------------------------------
handle_request(ChannelPid, ChannelId, Type, Data, WantReply, From, D) ->
case ssh_channel:cache_lookup(cache(D), ChannelId) of
#channel{remote_id = Id} = Channel ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 15:02:36 +0000