ssl: Add option signature_algs

In TLS-1.2 The signature algorithm and the hash function algorithm
used to produce the digest that is used when creating the digital signature
may be negotiated through the signature algorithm extension RFC 5246.

We want to make these algorithm pairs configurable.
In connections using lower versions of TLS these algorithms are
implicit defined and can not be negotiated or configured.

DTLS is updated to not cause dialyzer errors, but needs to get a real
implementation later.

1 files changed, 56 insertions, 2 deletions

diff --git a/lib/ssl/test/ssl_basic_SUITE.erl b/lib/ssl/test/ssl_basic_SUITE.erl
index f2cf99e8a8..f045d50cce 100644
--- a/lib/ssl/test/ssl_basic_SUITE.erl
+++ b/lib/ssl/test/ssl_basic_SUITE.erl
@@ -58,7 +58,7 @@ all() ->
 groups() ->
     [{basic, [], basic_tests()},
      {options, [], options_tests()},
-     {'tlsv1.2', [], all_versions_groups()},
+     {'tlsv1.2', [], all_versions_groups() ++ [conf_signature_algs, no_common_signature_algs]},
      {'tlsv1.1', [], all_versions_groups()},
      {'tlsv1', [], all_versions_groups() ++ rizzo_tests()},
      {'sslv3', [], all_versions_groups() ++ rizzo_tests() ++ [ciphersuite_vs_version]},
@@ -2900,7 +2900,61 @@ ciphersuite_vs_version(Config) when is_list(Config) ->
 	_ ->
 	    ct:fail({unexpected_server_hello, ServerHello})
     end.
-										
+			
+%%--------------------------------------------------------------------
+conf_signature_algs() ->
+    [{doc,"Test to set the signature_algs option on both client and server"}].
+conf_signature_algs(Config) when is_list(Config) -> 
+    ClientOpts = ?config(client_opts, Config),
+    ServerOpts = ?config(server_opts, Config),
+    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
+    Server = 
+	ssl_test_lib:start_server([{node, ServerNode}, {port, 0}, 
+				   {from, self()}, 
+				   {mfa, {ssl_test_lib, send_recv_result, []}},
+				   {options,  [{active, false}, {signature_algs, [{sha256, rsa}]} | 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, send_recv_result, []}},
+				   {options, [{active, false}, {signature_algs, [{sha256, rsa}]} | ClientOpts]}]),
+    
+    ct:log("Testcase ~p, Client ~p  Server ~p ~n",
+			 [self(), Client, Server]),
+    
+    ssl_test_lib:check_result(Server, ok, Client, ok),
+    
+    ssl_test_lib:close(Server),
+    ssl_test_lib:close(Client).
+
+
+%%--------------------------------------------------------------------
+no_common_signature_algs()  ->
+    [{doc,"Set the signature_algs option so that there client and server does not share any hash sign algorithms"}].
+no_common_signature_algs(Config) when is_list(Config) ->
+    
+    ClientOpts = ?config(client_opts, Config),
+    ServerOpts = ?config(server_opts, Config),
+
+    {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
+
+
+    Server = ssl_test_lib:start_server_error([{node, ServerNode}, {port, 0},
+					      {from, self()},
+					      {options, [{signature_algs, [{sha256, rsa}]}
+							 | ServerOpts]}]),
+    Port = ssl_test_lib:inet_port(Server),
+    Client = ssl_test_lib:start_client_error([{node, ClientNode}, {port, Port},
+					      {host, Hostname},
+					      {from, self()}, 
+					      {options, [{signature_algs, [{sha384, rsa}]}
+							 | ClientOpts]}]),
+    
+    ssl_test_lib:check_result(Server, {error, {tls_alert, "insufficient security"}},
+			      Client, {error, {tls_alert, "insufficient security"}}).
+    						
 %%--------------------------------------------------------------------
 
 dont_crash_on_handshake_garbage() ->