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POUnable to use PLAINTEXT signature with a DotNetOpenAuth ServiceProvider
 

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  1. POUnable to use PLAINTEXT signature with a DotNetOpenAuth ServiceProvider
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    <p>I am building an <a href="http://oauth.net/core/1.0a"><code>OAuth 1.0(a)</code></a> authorization server using <a href="http://www.dotnetopenauth.net/"><code>DotNetOpenAuth</code></a> (NuGet package <code>DotNetOpenAuth.OAuth.ServiceProvider, version = 4.1.4.12333</code>). The server is hosted in an ASP.NET application but that's irrelevant to the question.</p> <p>My <a href="https://github.com/AArnott/dotnetopenid/blob/master/src/DotNetOpenAuth.OAuth.ServiceProvider/OAuth/ServiceProvider.cs"><code>ServiceProvider</code></a> is configured like this:</p> <pre><code>private ServiceProvider GetServiceProvider() { var baseUri = "http://myauth.com"; return new ServiceProvider( new ServiceProviderDescription { UserAuthorizationEndpoint = new MessageReceivingEndpoint( new Uri(baseUri + "/get_request_token"), HttpDeliveryMethods.GetRequest ), RequestTokenEndpoint = new MessageReceivingEndpoint( new Uri(baseUri + "/authorize"), HttpDeliveryMethods.PostRequest ), AccessTokenEndpoint = new MessageReceivingEndpoint( new Uri(baseUri + "/get_token"), HttpDeliveryMethods.PostRequest ), ProtocolVersion = ProtocolVersion.V10a, TamperProtectionElements = new ITamperProtectionChannelBindingElement[] { new PlaintextSigningBindingElement(), new HmacSha1SigningBindingElement(), }, }, tokenManager, new OAuthServiceProviderMessageFactory(tokenManager) ); } </code></pre> <p>The relevant part of my <code>get_request_token</code> endpoint looks like this:</p> <pre><code>var serviceProvider = GetServiceProvider(); var tokenRequest = serviceProvider.ReadTokenRequest(); </code></pre> <p>Now when a consumer sends the following request to this endpoint:</p> <pre><code>GET /get_request_token?oauth_nonce=C5657420BCE5F3224914304376B5334696B09B7FFC17C105A7F9629A008869DC&amp;oauth_timestamp=1356006599&amp;oauth_consumer_key=sampleconsumer&amp;oauth_signature_method=plaintext&amp;oauth_signature=samplesecret%26&amp;oauth_version=1.0&amp;oauth_callback=http%3a%2f%2flocalhost%3a30103%2fCustomOAuth1 HTTP/1.1 Host: localhost:8180 Connection: close </code></pre> <p>(broken for clarity):</p> <pre><code>oauth_nonce=C5657420BCE5F3224914304376B5334696B09B7FFC17C105A7F9629A008869DC oauth_timestamp=1356006599 oauth_consumer_key=sampleconsumer oauth_signature_method=plaintext oauth_signature=samplesecret%26 oauth_version=1.0 oauth_callback=http%3a%2f%2flocalhost%3a30103%2fCustomOAuth1 </code></pre> <p>The <code>serviceProvider.ReadTokenRequest()</code> method throws an exception:</p> <pre><code>The UnauthorizedTokenRequest message required protections {All} but the channel could only apply {Expiration, ReplayProtection}. at DotNetOpenAuth.Messaging.Channel.ProcessIncomingMessage(IProtocolMessage message) at DotNetOpenAuth.Messaging.Channel.ReadFromRequest(HttpRequestBase httpRequest) at DotNetOpenAuth.Messaging.Channel.TryReadFromRequest[TRequest](HttpRequestBase httpRequest, TRequest&amp; request) at DotNetOpenAuth.OAuth.ServiceProvider.ReadTokenRequest(HttpRequestBase request) at DotNetOpenAuth.OAuth.ServiceProvider.ReadTokenRequest() at OAuthServers.OAuth1.Services.OAuth1Service.Any(GetRequestTokenRequest request) at lambda_method(Closure , Object , Object ) at ServiceStack.ServiceHost.ServiceRunner`1.Execute(IRequestContext requestContext, Object instance, TRequest request) </code></pre> <p>On the other hand if the client sends the following request:</p> <pre><code>GET /get_request_token?oauth_callback=http%3a%2f%2flocalhost%3a65271%2foauth1%2fHandleAccessToken&amp;oauth_consumer_key=sampleconsumer&amp;oauth_nonce=rGFvxlWm&amp;oauth_signature_method=HMAC-SHA1&amp;oauth_signature=HV%2f5Vq%2b0cF3NrtiISE9k4jmgCrY%3d&amp;oauth_version=1.0&amp;oauth_timestamp=1356007830 HTTP/1.1 Host: localhost:8180 Connection: close </code></pre> <p>(broken for clarity):</p> <pre><code>oauth_callback=http%3a%2f%2flocalhost%3a65271%2foauth1%2fHandleAccessToken oauth_consumer_key=sampleconsumer oauth_nonce=rGFvxlWm oauth_signature_method=HMAC-SHA1 oauth_signature=HV%2f5Vq%2b0cF3NrtiISE9k4jmgCrY%3d oauth_version=1.0 oauth_timestamp=1356007830 </code></pre> <p>it succeeds. </p> <p>As you can see the only difference between those 2 requests is the <code>oauth_signature_method</code> being used. In the first case <code>PLAINTEXT</code> is used whereas in the second <code>HMAC-SHA1</code>.</p> <p>Is it possible to make DotNetOpenAuth accept a <code>PLAINTEXT</code> signature method for the request token endpoint along with the GET verb (even if the <a href="http://oauth.net/core/1.0a/#rfc.section.6.1.1"><code>OAuth 1.0(a) specification</code></a> recommends POST to be used for this endpoint)? Is there some config option that could <em>relax</em> this requirement on the server? </p> <p>At the moment modifying the client is not an option for me.</p>
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    1. USstarskythehutch
    1. USDarin Dimitrov
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    1. COAre you using SSL? plain text requires HTTPS URLs.
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      1. USAndrew Arnott
    2. CONo, I am not using SSL for the testing site. I have setup `relaxSslRequirements="true"` in my web.config on the `<messaging>` element. Let me try activating SSL to see if this works.
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      1. USDarin Dimitrov
    3. COActivating SSL on the server didn't solve the problem. It's worth mentioning that I am using an invalid SSL certificate on the server (IIS Express) and ignored SSL errors from the client using the `ServicePointManager.ServerCertificateValidationCallback` but normally this shouldn't affect the server, should it? Anyway I will end up modifying the client to use HMAC-SHA1, but just wanted to know if this could be solved without modifying the client (out of personal interest and to better know how DotNetOpenAuth works).
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      1. USDarin Dimitrov
 

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