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%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2016, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 13 Dec 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(xmpp_stream_pkix).
%% API
-export([authenticate/1, authenticate/2]).
-include("xmpp.hrl").
-include_lib("public_key/include/public_key.hrl").
-include("XmppAddr.hrl").
%%%===================================================================
%%% API
%%%===================================================================
-spec authenticate(xmpp_stream_in:state() | xmpp_stream_out:state())
-> {ok, binary()} | {error, binary(), binary()}.
authenticate(State) ->
authenticate(State, <<"">>).
-spec authenticate(xmpp_stream_in:state() | xmpp_stream_out:state(), binary())
-> {ok, binary()} | {error, binary(), binary()}.
authenticate(#{xmlns := ?NS_SERVER, remote_server := Peer,
sockmod := SockMod, socket := Socket}, _Authzid) ->
case SockMod:get_peer_certificate(Socket) of
{ok, Cert} ->
case SockMod:get_verify_result(Socket) of
0 ->
case ejabberd_idna:domain_utf8_to_ascii(Peer) of
false ->
{error, <<"Cannot decode remote server name">>, Peer};
AsciiPeer ->
case lists:any(
fun(D) -> match_domain(AsciiPeer, D) end,
get_cert_domains(Cert)) of
true ->
{ok, Peer};
false ->
{error, <<"Certificate host name mismatch">>, Peer}
end
end;
VerifyRes ->
{error, fast_tls:get_cert_verify_string(VerifyRes, Cert), Peer}
end;
{error, _Reason} ->
{error, <<"Cannot get peer certificate">>, Peer};
error ->
{error, <<"Cannot get peer certificate">>, Peer}
end;
authenticate(_State, _Authzid) ->
%% TODO: client PKIX authentication
{error, <<"Client certificate verification not implemented">>, <<"">>}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
get_cert_domains(Cert) ->
TBSCert = Cert#'Certificate'.tbsCertificate,
Subject = case TBSCert#'TBSCertificate'.subject of
{rdnSequence, Subj} -> lists:flatten(Subj);
_ -> []
end,
Extensions = case TBSCert#'TBSCertificate'.extensions of
Exts when is_list(Exts) -> Exts;
_ -> []
end,
lists:flatmap(
fun(#'AttributeTypeAndValue'{type = ?'id-at-commonName',value = Val}) ->
case 'OTP-PUB-KEY':decode('X520CommonName', Val) of
{ok, {_, D1}} ->
D = if is_binary(D1) -> D1;
is_list(D1) -> list_to_binary(D1);
true -> error
end,
if D /= error ->
case jid:from_string(D) of
#jid{luser = <<"">>, lserver = LD,
lresource = <<"">>} ->
[LD];
_ -> []
end;
true -> []
end;
_ -> []
end;
(_) -> []
end, Subject) ++
lists:flatmap(
fun(#'Extension'{extnID = ?'id-ce-subjectAltName',
extnValue = Val}) ->
BVal = if is_list(Val) -> list_to_binary(Val);
true -> Val
end,
case 'OTP-PUB-KEY':decode('SubjectAltName', BVal) of
{ok, SANs} ->
lists:flatmap(
fun({otherName, #'AnotherName'{'type-id' = ?'id-on-xmppAddr',
value = XmppAddr}}) ->
case 'XmppAddr':decode('XmppAddr', XmppAddr) of
{ok, D} when is_binary(D) ->
case jid:from_string(D) of
#jid{luser = <<"">>,
lserver = LD,
lresource = <<"">>} ->
case ejabberd_idna:domain_utf8_to_ascii(LD) of
false ->
[];
PCLD ->
[PCLD]
end;
_ -> []
end;
_ -> []
end;
({dNSName, D}) when is_list(D) ->
case jid:from_string(list_to_binary(D)) of
#jid{luser = <<"">>,
lserver = LD,
lresource = <<"">>} ->
[LD];
_ -> []
end;
(_) -> []
end, SANs);
_ -> []
end;
(_) -> []
end, Extensions).
match_domain(Domain, Domain) -> true;
match_domain(Domain, Pattern) ->
DLabels = str:tokens(Domain, <<".">>),
PLabels = str:tokens(Pattern, <<".">>),
match_labels(DLabels, PLabels).
match_labels([], []) -> true;
match_labels([], [_ | _]) -> false;
match_labels([_ | _], []) -> false;
match_labels([DL | DLabels], [PL | PLabels]) ->
case lists:all(fun (C) ->
$a =< C andalso C =< $z orelse
$0 =< C andalso C =< $9 orelse
C == $- orelse C == $*
end,
binary_to_list(PL))
of
true ->
Regexp = ejabberd_regexp:sh_to_awk(PL),
case ejabberd_regexp:run(DL, Regexp) of
match -> match_labels(DLabels, PLabels);
nomatch -> false
end;
false -> false
end.
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