Bug 8563 - TLS connections using a client certificate only work with RSA keys
Summary: TLS connections using a client certificate only work with RSA keys
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: System.Web.Services ()
Version: 2.10.x
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-11-23 05:56 UTC by Mathias
Modified: 2015-03-26 12:06 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Mathias 2012-11-23 05:56:01 UTC
I am using a Webservice (i.e. a class derived from SoapHttpClientProtocol) over a https connection using a client certificate for authentication. I set this client certificate by adding it to the ClientCertificates property (defined in HttpWebClientProtocol, the base class of SoapHttpClientProtocol) of my proxy class.

This works just fine, as long as I stick to RSA keys. DSA or ECDSA keys do not work. I analysed some stack traces and browsed the codes, and found out, that the relevant class for actually creating the signature in the handshake is Mono.Security.Protocol.Tls.Handshake.Client.TlsClientCertificateVerify. And there, the code blindly assumes the the AsymmetricAlgorithm object of the private is of type RSA.

I am aware, that there are no usable base methods for signing/decrypting in AsymmetricAlgorithm, which could be easily used, but the logic here could be a bit better. It should at least check for the other implementations of AsymmetricAlgorithm defined by .NET (DSA and ECDsa)