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-rw-r--r--lib/ssh/src/ssh_auth.erl126
1 files changed, 53 insertions, 73 deletions
diff --git a/lib/ssh/src/ssh_auth.erl b/lib/ssh/src/ssh_auth.erl
index 88c8144063..9eb11a53dc 100644
--- a/lib/ssh/src/ssh_auth.erl
+++ b/lib/ssh/src/ssh_auth.erl
@@ -136,34 +136,40 @@ keyboard_interactive_msg([#ssh{user = User,
Ssh)
end.
-publickey_msg([Alg, #ssh{user = User,
+publickey_msg([SigAlg, #ssh{user = User,
session_id = SessionId,
service = Service,
opts = Opts} = Ssh]) ->
- Hash = ssh_transport:sha(Alg),
+ Hash = ssh_transport:sha(SigAlg),
+ KeyAlg = key_alg(SigAlg),
{KeyCb,KeyCbOpts} = ?GET_OPT(key_cb, Opts),
UserOpts = ?GET_OPT(user_options, Opts),
- case KeyCb:user_key(Alg, [{key_cb_private,KeyCbOpts}|UserOpts]) of
+ case KeyCb:user_key(KeyAlg, [{key_cb_private,KeyCbOpts}|UserOpts]) of
{ok, PrivKey} ->
- StrAlgo = atom_to_list(Alg),
- case encode_public_key(StrAlgo, ssh_transport:extract_public_key(PrivKey)) of
- not_ok ->
- {not_ok, Ssh};
+ SigAlgStr = atom_to_list(SigAlg),
+ 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, StrAlgo),
+ SigData = build_sig_data(SessionId, User, Service,
+ PubKeyBlob, SigAlgStr),
Sig = ssh_transport:sign(SigData, Hash, PrivKey),
- SigBlob = list_to_binary([?string(StrAlgo), ?binary(Sig)]),
+ 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(StrAlgo),
+ ?string(SigAlgStr),
?binary(PubKeyBlob),
?binary(SigBlob)]},
Ssh)
- end;
+ catch
+ _:_ ->
+ {not_ok, Ssh}
+ end;
_Error ->
{not_ok, Ssh}
end.
@@ -175,6 +181,7 @@ service_request_msg(Ssh) ->
%%%----------------------------------------------------------------
init_userauth_request_msg(#ssh{opts = Opts} = Ssh) ->
+ %% Client side
case ?GET_OPT(user, Opts) of
undefined ->
ErrStr = "Could not determine the users name",
@@ -183,25 +190,16 @@ init_userauth_request_msg(#ssh{opts = Opts} = Ssh) ->
description = ErrStr});
User ->
- Msg = #ssh_msg_userauth_request{user = User,
- service = "ssh-connection",
- method = "none",
- data = <<>>},
- Algs0 = ?GET_OPT(pref_public_key_algs, Opts),
- %% The following line is not strictly correct. The call returns the
- %% supported HOST key types while we are interested in USER keys. However,
- %% they "happens" to be the same (for now). This could change....
- %% There is no danger as long as the set of user keys is a subset of the set
- %% of host keys.
- CryptoSupported = ssh_transport:supported_algorithms(public_key),
- Algs = [A || A <- Algs0,
- lists:member(A, CryptoSupported)],
-
- Prefs = method_preference(Algs),
- ssh_transport:ssh_packet(Msg, Ssh#ssh{user = User,
- userauth_preference = Prefs,
- userauth_methods = none,
- service = "ssh-connection"})
+ ssh_transport:ssh_packet(
+ #ssh_msg_userauth_request{user = User,
+ service = "ssh-connection",
+ method = "none",
+ data = <<>>},
+ Ssh#ssh{user = User,
+ userauth_preference = method_preference(Ssh#ssh.userauth_pubkeys),
+ userauth_methods = none,
+ service = "ssh-connection"}
+ )
end.
%%%----------------------------------------------------------------
@@ -272,8 +270,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
#ssh{opts = Opts,
userauth_supported_methods = Methods} = Ssh) ->
- case pre_verify_sig(User, binary_to_list(BAlg),
- KeyBlob, Opts) of
+ case pre_verify_sig(User, KeyBlob, Opts) of
true ->
{not_authorized, {User, undefined},
ssh_transport:ssh_packet(
@@ -299,8 +296,7 @@ handle_userauth_request(#ssh_msg_userauth_request{user = User,
userauth_supported_methods = Methods} = Ssh) ->
case verify_sig(SessionId, User, "ssh-connection",
- binary_to_list(BAlg),
- KeyBlob, SigWLen, Opts) of
+ BAlg, KeyBlob, SigWLen, Opts) of
true ->
{authorized, User,
ssh_transport:ssh_packet(
@@ -453,14 +449,14 @@ handle_userauth_info_response(#ssh_msg_userauth_info_response{},
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
-method_preference(Algs) ->
- lists:foldr(fun(A, Acc) ->
- [{"publickey", ?MODULE, publickey_msg, [A]} | Acc]
- end,
- [{"password", ?MODULE, password_msg, []},
- {"keyboard-interactive", ?MODULE, keyboard_interactive_msg, []}
- ],
- Algs).
+method_preference(SigKeyAlgs) ->
+ %% PubKeyAlgs: List of user (client) public key algorithms to try to use.
+ %% All of the acceptable algorithms is the default values.
+ PubKeyDefs = [{"publickey", ?MODULE, publickey_msg, [A]} || A <- SigKeyAlgs],
+ NonPKmethods = [{"password", ?MODULE, password_msg, []},
+ {"keyboard-interactive", ?MODULE, keyboard_interactive_msg, []}
+ ],
+ PubKeyDefs ++ NonPKmethods.
check_password(User, Password, Opts, Ssh) ->
case ?GET_OPT(pwdfun, Opts) of
@@ -499,9 +495,9 @@ get_password_option(Opts, User) ->
false -> ?GET_OPT(password, Opts)
end.
-pre_verify_sig(User, Alg, KeyBlob, Opts) ->
+pre_verify_sig(User, KeyBlob, Opts) ->
try
- {ok, Key} = decode_public_key_v2(KeyBlob, Alg),
+ Key = public_key:ssh_decode(KeyBlob, ssh2_pubkey), % or exception
{KeyCb,KeyCbOpts} = ?GET_OPT(key_cb, Opts),
UserOpts = ?GET_OPT(user_options, Opts),
KeyCb:is_auth_key(Key, User, [{key_cb_private,KeyCbOpts}|UserOpts])
@@ -510,23 +506,18 @@ pre_verify_sig(User, Alg, KeyBlob, Opts) ->
false
end.
-verify_sig(SessionId, User, Service, Alg, KeyBlob, SigWLen, Opts) ->
+verify_sig(SessionId, User, Service, AlgBin, KeyBlob, SigWLen, Opts) ->
try
- {ok, Key} = decode_public_key_v2(KeyBlob, Alg),
-
+ Alg = binary_to_list(AlgBin),
{KeyCb,KeyCbOpts} = ?GET_OPT(key_cb, Opts),
UserOpts = ?GET_OPT(user_options, Opts),
- case KeyCb:is_auth_key(Key, User, [{key_cb_private,KeyCbOpts}|UserOpts]) of
- true ->
- PlainText = build_sig_data(SessionId, User,
- Service, KeyBlob, Alg),
- <<?UINT32(AlgSigLen), AlgSig:AlgSigLen/binary>> = SigWLen,
- <<?UINT32(AlgLen), _Alg:AlgLen/binary,
- ?UINT32(SigLen), Sig:SigLen/binary>> = AlgSig,
- ssh_transport:verify(PlainText, ssh_transport:sha(list_to_atom(Alg)), Sig, Key);
- false ->
- false
- end
+ Key = public_key:ssh_decode(KeyBlob, ssh2_pubkey), % or exception
+ true = KeyCb:is_auth_key(Key, User, [{key_cb_private,KeyCbOpts}|UserOpts]),
+ PlainText = build_sig_data(SessionId, User, Service, KeyBlob, Alg),
+ <<?UINT32(AlgSigLen), AlgSig:AlgSigLen/binary>> = SigWLen,
+ <<?UINT32(AlgLen), _Alg:AlgLen/binary,
+ ?UINT32(SigLen), Sig:SigLen/binary>> = AlgSig,
+ ssh_transport:verify(PlainText, ssh_transport:sha(Alg), Sig, Key)
catch
_:_ ->
false
@@ -598,18 +589,7 @@ keyboard_interact_fun(KbdInteractFun, Name, Instr, PromptInfos, NumPrompts) ->
language = "en"}})
end.
-decode_public_key_v2(Bin, _Type) ->
- try
- public_key:ssh_decode(Bin, ssh2_pubkey)
- of
- Key -> {ok, Key}
- catch
- _:_ -> {error, bad_format}
- end.
-encode_public_key(_Alg, Key) ->
- try
- public_key:ssh_encode(Key, ssh2_pubkey)
- catch
- _:_ -> not_ok
- end.
+key_alg('rsa-sha2-256') -> 'ssh-rsa';
+key_alg('rsa-sha2-512') -> 'ssh-rsa';
+key_alg(Alg) -> Alg.
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-19 02:03:28 +0000