[Mono-list] Mono 5 TLS 1.2 support not yet built-in???

[Frédéric SOUCHU]

Hi,
I am running Mono on CentOS 6 (binaries downloaded from official Mono yum repo) and could not get a connection to TLS 1.2 servers.
The documentation says ‘since 4.8 TLS 1.2 is natively supported’ but I couldn’t get it to work.
What I am missing to get TLS 1.2 on Mono? Is the only option to recompile from sources???

How to reproduce:
$> export MONO_TLS_PROVIDER=legacy
$> csharp -e 'Console.WriteLine (new System.Net.WebClient ().DownloadString ("https://www.howsmyssl.com/")'
I get back a not so nice message:
Bad Your client is using TLS 1.0, which is very old, possibly susceptible to the BEAST attack, and doesn't have the best cipher suites available on it. Additions like AES-GCM, and SHA256 to replace MD5-SHA-1 are unavailable to a TLS 1.0 client as well as many more modern cipher suites.
Trying with the BoringTLS flag yields an even worse error:
export MONO_TLS_PROVIDER=btls

Output:
System.Net.WebException:
Error: ConnectFailure (TLS Support not available.)
---> System.NotSupportedException: TLS Support not available.
---> System.NotSupportedException: No such TLS Provider: `btls'.
  at Mono.Net.Security.MonoTlsProviderFactory.LookupProviderType (System.String name, System.Boolean throwOnError) [0x00032] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsProviderFactory.LookupProvider (System.String name, System.Boolean throwOnError) [0x00000] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsProviderFactory.TryDynamicLoad () [0x00019] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsProviderFactory.CreateDefaultProviderImpl () [0x00000] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsProviderFactory.InitializeInternal () [0x0001a] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
   --- End of inner exception stack trace ---
  at Mono.Net.Security.MonoTlsProviderFactory.InitializeInternal () [0x0002e] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsProviderFactory.GetProviderInternal () [0x00010] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at Mono.Net.Security.MonoTlsStream..ctor (System.Net.HttpWebRequest request, System.Net.Sockets.NetworkStream networkStream) [0x00027] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at System.Net.WebConnection.CreateStream (System.Net.HttpWebRequest request) [0x00066] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
   --- End of inner exception stack trace ---
  at System.Net.WebClient.DownloadDataInternal (System.Uri address, System.Net.WebRequest& request) [0x00072] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at System.Net.WebClient.DownloadString (System.Uri address) [0x00020] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at System.Net.WebClient.DownloadString (System.String address) [0x00016] in <d2abb5dd463e4257bc4bb6c9614f73e7>:0
  at <InteractiveExpressionClass>.Host (System.Object& $retval) [0x00005] in <61903e49f3474c469d10aac989d2bbea>:0
  at Mono.CSharp.Evaluator.Evaluate (System.String input, System.Object& result, System.Boolean& result_set) [0x00038] in <26092501e18f4d6bbb84790c331dcb20>:0
  at Mono.CSharpShell.Evaluate (System.String input) [0x00000] in <9c2a1356e8c3450d8aa1583549a8198e>:0

System information:
Linux 2.6.32-642.1.1.el6.x86_64 #1 SMP Fri May 6 14:54:05 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux

Mono Version:
Mono JIT compiler version 5.0.1.1 (2017-02/5077205 Wed May 24 13:08:40 UTC 2017)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com<http://www.mono-project.com>
        TLS:           __thread
        SIGSEGV:       altstack
       Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug
        LLVM:          supported, not enabled.
        GC:            sgen (concurrent by default)

Regards,
Frederic

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