ssl: Proper handling of clients that choose to send an empty

answer to a certificate request

Solves ERL-599

4 files changed, 78 insertions, 38 deletions

diff --git a/lib/ssl/src/ssl_connection.erl b/lib/ssl/src/ssl_connection.erl
index 63fae78195..64ecc29b97 100644
--- a/lib/ssl/src/ssl_connection.erl
+++ b/lib/ssl/src/ssl_connection.erl
@@ -709,6 +709,22 @@ certify(internal, #server_key_exchange{exchange_keys = Keys},
 						Version, ?FUNCTION_NAME, State)
 	    end
     end;
+certify(internal, #certificate_request{},
+	#state{role = client, negotiated_version = Version,
+               key_algorithm = Alg} = State, _)
+  when Alg == dh_anon; Alg == ecdh_anon;
+       Alg == psk; Alg == dhe_psk; Alg == ecdhe_psk; Alg == rsa_psk;
+       Alg == srp_dss; Alg == srp_rsa; Alg == srp_anon ->
+    handle_own_alert(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE),
+                     Version, ?FUNCTION_NAME, State);
+certify(internal, #certificate_request{},
+	#state{session = #session{own_certificate = undefined},
+	       role = client} = State0, Connection) ->
+    %% The client does not have a certificate and will send an empty reply, the server may fail 
+    %% or accept the connection by its own preference. No signature algorihms needed as there is
+    %% no certificate to verify.
+    {Record, State} = Connection:next_record(State0),
+    Connection:next_event(?FUNCTION_NAME, Record, State#state{client_certificate_requested = true});
 certify(internal, #certificate_request{} = CertRequest,
 	#state{session = #session{own_certificate = Cert},
 	       role = client,
diff --git a/lib/ssl/src/ssl_connection.hrl b/lib/ssl/src/ssl_connection.hrl
index f9d2149170..72a7e6ebcc 100644
--- a/lib/ssl/src/ssl_connection.hrl
+++ b/lib/ssl/src/ssl_connection.hrl
@@ -61,7 +61,7 @@
           client_certificate_requested = false :: boolean(),
 	  key_algorithm         :: ssl_cipher:key_algo(),
 	  hashsign_algorithm = {undefined, undefined},
-	  cert_hashsign_algorithm,
+	  cert_hashsign_algorithm = {undefined, undefined},
           public_key_info      :: ssl_handshake:public_key_info() | 'undefined',
           private_key          :: public_key:private_key() | secret_printout() | 'undefined',
 	  diffie_hellman_params:: #'DHParameter'{} | undefined | secret_printout(),
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl
index 7efb89bfae..8b1ea52ac9 100644
--- a/lib/ssl/src/ssl_handshake.erl
+++ b/lib/ssl/src/ssl_handshake.erl
@@ -1066,12 +1066,6 @@ select_hashsign(_, Cert, _, _, Version) ->
 %%
 %% Description: Handles signature algorithms selection for certificate requests (client) 
 %%--------------------------------------------------------------------
-select_hashsign(#certificate_request{}, undefined, _, {Major, Minor})  when Major >= 3 andalso Minor >= 3->
-    %% There client does not have a certificate and will send an empty reply, the server may fail 
-    %% or accept the connection by its own preference. No signature algorihms needed as there is
-    %% no certificate to verify.
-    {undefined, undefined}; 
- 
 select_hashsign(#certificate_request{hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSigns}, 
 				     certificate_types = Types}, Cert, SupportedHashSigns, 
 		{Major, Minor})  when Major >= 3 andalso Minor >= 3->
diff --git a/lib/ssl/test/ssl_certificate_verify_SUITE.erl b/lib/ssl/test/ssl_certificate_verify_SUITE.erl
index 0bc265fa10..1de4c89d7f 100644
--- a/lib/ssl/test/ssl_certificate_verify_SUITE.erl
+++ b/lib/ssl/test/ssl_certificate_verify_SUITE.erl
@@ -40,14 +40,22 @@
 %%--------------------------------------------------------------------
 all() ->
     [
-     {group, tls},
-     {group, dtls}
+     {group, 'tlsv1.2'},
+     {group, 'tlsv1.1'},
+     {group, 'tlsv1'},
+     {group, 'sslv3'},
+     {group, 'dtlsv1.2'},
+     {group, 'dtlsv1'}
     ].
 
 groups() ->
     [
-     {tls, [], all_protocol_groups()},
-     {dtls, [], all_protocol_groups()},
+     {'tlsv1.2', [], all_protocol_groups()},
+     {'tlsv1.1', [], all_protocol_groups()},
+     {'tlsv1', [], all_protocol_groups()},
+     {'sslv3', [], all_protocol_groups()},
+     {'dtlsv1.2', [], all_protocol_groups()},
+     {'dtlsv1', [], all_protocol_groups()},
      {active, [], tests()},
      {active_once, [], tests()},
      {passive, [], tests()},
@@ -65,6 +73,7 @@ tests() ->
      verify_none,
      server_require_peer_cert_ok,
      server_require_peer_cert_fail,
+     server_require_peer_cert_empty_ok,
      server_require_peer_cert_partial_chain,
      server_require_peer_cert_allow_partial_chain,
      server_require_peer_cert_do_not_allow_partial_chain,
@@ -104,24 +113,6 @@ end_per_suite(_Config) ->
     ssl:stop(),
     application:stop(crypto).
 
-init_per_group(tls, Config0) ->
-    Version = tls_record:protocol_version(tls_record:highest_protocol_version([])),
-    ssl:stop(),
-    application:load(ssl),
-    application:set_env(ssl, protocol_version, Version),
-    ssl:start(),
-    Config = ssl_test_lib:init_tls_version(Version, Config0),
-    [{version, tls_record:protocol_version(Version)} | Config];
-
-init_per_group(dtls, Config0) ->
-    Version = dtls_record:protocol_version(dtls_record:highest_protocol_version([])),
-    ssl:stop(),
-    application:load(ssl),
-    application:set_env(ssl, protocol_version, Version),
-    ssl:start(),
-    Config = ssl_test_lib:init_tls_version(Version, Config0),
-    [{version, dtls_record:protocol_version(Version)} | Config];
-
 init_per_group(active, Config) ->
     [{active, true}, {receive_function, send_recv_result_active} | Config];
 init_per_group(active_once, Config) ->
@@ -130,15 +121,24 @@ init_per_group(passive, Config) ->
     [{active, false}, {receive_function, send_recv_result} | Config];
 init_per_group(error_handling, Config) ->
     [{active, false}, {receive_function, send_recv_result} | Config];
+init_per_group(GroupName, Config) ->
+    case ssl_test_lib:is_tls_version(GroupName) of
+	true ->
+	    case ssl_test_lib:sufficient_crypto_support(GroupName) of
+		true ->
+		    [{version, GroupName} | ssl_test_lib:init_tls_version(GroupName, Config)];
+		false ->
+		    {skip, "Missing crypto support"}
+	    end
+    end.
 
-init_per_group(_, Config) ->
-    Config.
-
-end_per_group(GroupName, Config) when GroupName == tls;
-                                      GroupName == dtls ->
-    ssl_test_lib:clean_tls_version(Config);
-end_per_group(_GroupName, Config) ->
-    Config.
+end_per_group(GroupName, Config) ->
+       case ssl_test_lib:is_tls_version(GroupName) of
+        true ->
+            ssl_test_lib:clean_tls_version(Config);
+        false ->
+            Config
+    end.
 
 init_per_testcase(_TestCase, Config) ->
     ssl:stop(),
@@ -306,6 +306,35 @@ server_require_peer_cert_fail(Config) when is_list(Config) ->
     end.
 
 %%--------------------------------------------------------------------
+server_require_peer_cert_empty_ok() ->
+    [{doc,"Test server option fail_if_no_peer_cert when peer sends cert"}].
+
+server_require_peer_cert_empty_ok(Config) when is_list(Config) ->
+    ServerOpts = [{verify, verify_peer}, {fail_if_no_peer_cert, false}
+		  | ssl_test_lib:ssl_options(server_rsa_opts, Config)],
+    ClientOpts0 = ssl_test_lib:ssl_options(client_rsa_opts, Config),
+    Active = proplists:get_value(active, Config),
+    ReceiveFunction =  proplists:get_value(receive_function, Config),
+    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
+
+    ClientOpts = proplists:delete(keyfile, proplists:delete(certfile, ClientOpts0)),
+
+    Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0},
+					{from, self()},
+			   {mfa, {ssl_test_lib, ReceiveFunction, []}},
+			   {options, [{active, Active} | ServerOpts]}]),
+    Port = ssl_test_lib:inet_port(Server),
+    Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port},
+					{host, Hostname},
+			   {from, self()},
+			   {mfa, {ssl_test_lib, ReceiveFunction, []}},
+			   {options, [{active, Active} | ClientOpts]}]),
+
+    ssl_test_lib:check_result(Server, ok, Client, ok),
+    ssl_test_lib:close(Server),
+    ssl_test_lib:close(Client).
+
+%%--------------------------------------------------------------------
 
 server_require_peer_cert_partial_chain() ->
     [{doc, "Client sends an incompleate chain, by default not acceptable."}].
@@ -930,6 +959,7 @@ client_with_cert_cipher_suites_handshake(Config) when is_list(Config) ->
                                                                  Config, "_sign_only_extensions"),
     ClientOpts =  ssl_test_lib:ssl_options(ClientOpts0, Config),
     ServerOpts =  ssl_test_lib:ssl_options(ServerOpts0, Config),
+    TLSVersion = ssl_test_lib:protocol_version(Config, tuple),
 
     {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
     Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0},
@@ -938,7 +968,7 @@ client_with_cert_cipher_suites_handshake(Config) when is_list(Config) ->
 					       send_recv_result_active, []}},
 					{options, [{active, true},
 						   {ciphers, 
-						    ssl_test_lib:rsa_non_signed_suites(proplists:get_value(version, Config))}
+						    ssl_test_lib:rsa_non_signed_suites(TLSVersion)}
 						   | ServerOpts]}]),
     Port  = ssl_test_lib:inet_port(Server),
     Client = ssl_test_lib:start_client([{node, ClientNode}, {port, Port},