[erlang-questions] ssl psk since 20.3 failed

[Oliver Bollmann]

This works with 20.2.2 but since 20.3(21.x) it doesn't!

Error in process <0.79.0> with exit value:
{{badmatch,{error,{tls_alert,"handshake failure"}}},
  [{client_server,init_connect,1,[{file,"client_server.erl"},{line,37}]}]}

Any hints?

-module(client_server). %%% Purpose: Example of SSL client and server using psk. -export([start/0, init_connect/1]). start() ->
   %% Start ssl application {ok,StartedApps} = application:ensure_all_started(ssl),

   %% Let the current process be the server that listens and accepts %% Listen {ok,LSock} = ssl:listen(0, mk_opts(listen)),
   {ok, {_,LPort}} = ssl:sockname(LSock),
   io:fwrite("Listen: port = ~w.~n", [LPort]),

   %% Spawn the client process that connects to the server spawn(?MODULE, init_connect, [LPort]),

   %% Accept {ok,ASock} = ssl:transport_accept(LSock),
   ok = ssl:ssl_accept(ASock),
   io:fwrite("Accept: accepted.~n"),
   ssl:send(ASock,"hello"),
   {error, closed} = ssl:recv(ASock,0),
   io:fwrite("Accept: detected closed.~n"),
   ssl:close(ASock),
   io:fwrite("Listen: closing and terminating.~n"),
   ssl:close(LSock),

   lists:foreach(fun application:stop/1, lists:reverse(StartedApps)). %% Client connect init_connect(LPort) ->
   {ok,Host} = inet:gethostname(),
   {ok,CSock} = ssl:connect(Host,LPort, mk_opts(connect)),
   io:fwrite("Connect: connected.~n"),
   {ok,Data} = ssl:recv(CSock,0),
   io:fwrite("Connect: got data: ~p~n", [Data]),
   io:fwrite("Connect: closing and terminating.~n"),
   ssl:close(CSock). mk_opts(listen) ->
   mk_opts("server");
mk_opts(connect) ->
   mk_opts("client");
mk_opts(Role) ->
   [{active, false},
     {psk_identity,Role},
     {user_lookup_fun,{fun lookup/3,list_to_binary(Role)}},
     {versions,['tlsv1.2']},
     {ciphers, [{dhe_psk,aes_256_gcm,null,sha384}
     ]}
   ]. lookup(psk,_,_) -> {ok,<<"psk">>}.

-- 
Grüße
Oliver Bollmann

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