/// <summary>
/// Creates a new association with a given Provider.
/// </summary>
/// <param name="provider">The provider to create an association with.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// The newly created association, or null if no association can be created with
/// the given Provider given the current security settings.
/// </returns>
/// <remarks>
/// A new association is created and returned even if one already exists in the
/// association store.
/// Any new association is automatically added to the <see cref="associationStore" />.
/// </remarks>
private async Task <Association> CreateNewAssociationAsync(IProviderEndpoint provider, CancellationToken cancellationToken)
{
Requires.NotNull(provider, "provider");
// If there is no association store, there is no point in creating an association.
if (this.associationStore == null)
{
return(null);
}
try {
var associateRequest = AssociateRequestRelyingParty.Create(this.securitySettings, provider);
const int RenegotiateRetries = 1;
return(await this.CreateNewAssociationAsync(provider, associateRequest, RenegotiateRetries, cancellationToken));
} catch (VerificationException ex) {
// See Trac ticket #163. In partial trust host environments, the
// Diffie-Hellman implementation we're using for HTTP OP endpoints
// sometimes causes the CLR to throw:
// "VerificationException: Operation could destabilize the runtime."
// Just give up and use dumb mode in this case.
Logger.OpenId.ErrorFormat("VerificationException occurred while trying to create an association with {0}. {1}", provider.Uri, ex);
return(null);
}
}
public void AssociateRequestDeterminedBySecuritySettings()
{
Protocol protocol = Protocol.V20;
SecuritySettings securitySettings = new RelyingPartySecuritySettings();
securitySettings.MinimumHashBitLength = 160;
securitySettings.MaximumHashBitLength = 160;
ProviderEndpointDescription provider = new ProviderEndpointDescription(OPUri, protocol.Version);
Assert.AreEqual(AssociateRequestRelyingParty.Create(securitySettings, provider).AssociationType, protocol.Args.SignatureAlgorithm.HMAC_SHA1);
securitySettings.MinimumHashBitLength = 384;
securitySettings.MaximumHashBitLength = 384;
Assert.AreEqual(AssociateRequestRelyingParty.Create(securitySettings, provider).AssociationType, protocol.Args.SignatureAlgorithm.HMAC_SHA384);
}
public async Task GetRequest()
{
var httpInfo = new HttpRequestMessage(HttpMethod.Get, "http://someUri");
Assert.IsNull(await this.provider.GetRequestAsync(httpInfo), "An irrelevant request should return null.");
var providerDescription = new ProviderEndpointDescription(OPUri, Protocol.Default.Version);
// Test some non-empty request scenario.
HandleProvider(
async(op, req) => {
IRequest request = await op.GetRequestAsync(req);
Assert.IsInstanceOf <AutoResponsiveRequest>(request);
return(await op.PrepareResponseAsync(request));
});
var rp = this.CreateRelyingParty();
await rp.Channel.RequestAsync(AssociateRequestRelyingParty.Create(rp.SecuritySettings, providerDescription), CancellationToken.None);
}
private HttpRequestInfo CreateAssociateRequest(Uri opEndpoint)
{
var rp = CreateRelyingParty(true);
AssociateRequest associateMessage = AssociateRequestRelyingParty.Create(rp.SecuritySettings, new ProviderEndpointDescription(opEndpoint, Protocol.Default.Version));
Channel rpChannel = rp.Channel;
MemoryStream ms = new MemoryStream();
StreamWriter mswriter = new StreamWriter(ms);
mswriter.Write(MessagingUtilities.CreateQueryString(rpChannel.MessageDescriptions.GetAccessor(associateMessage)));
mswriter.Flush();
ms.Position = 0;
var headers = new WebHeaderCollection();
headers.Add(HttpRequestHeader.ContentType, Channel.HttpFormUrlEncoded);
var httpRequest = new HttpRequestInfo("POST", opEndpoint, headers, ms);
return(httpRequest);
}
public void GetRequest()
{
var httpInfo = new HttpRequestInfo("GET", new Uri("http://someUri"));
Assert.IsNull(this.provider.GetRequest(httpInfo), "An irrelevant request should return null.");
var providerDescription = new ProviderEndpointDescription(OPUri, Protocol.Default.Version);
// Test some non-empty request scenario.
OpenIdCoordinator coordinator = new OpenIdCoordinator(
rp => {
rp.Channel.Request(AssociateRequestRelyingParty.Create(rp.SecuritySettings, providerDescription));
},
op => {
IRequest request = op.GetRequest();
Assert.IsInstanceOf <AutoResponsiveRequest>(request);
op.Respond(request);
});
coordinator.Run();
}
/// <summary>
/// Creates a new association with a given Provider.
/// </summary>
/// <param name="provider">The provider to create an association with.</param>
/// <param name="associateRequest">The associate request. May be <c>null</c>, which will always result in a <c>null</c> return value..</param>
/// <param name="retriesRemaining">The number of times to try the associate request again if the Provider suggests it.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// The newly created association, or null if no association can be created with
/// the given Provider given the current security settings.
/// </returns>
/// <exception cref="ProtocolException">Create if an error occurs while creating the new association.</exception>
private async Task <Association> CreateNewAssociationAsync(IProviderEndpoint provider, AssociateRequest associateRequest, int retriesRemaining, CancellationToken cancellationToken)
{
Requires.NotNull(provider, "provider");
if (associateRequest == null || retriesRemaining < 0)
{
// this can happen if security requirements and protocol conflict
// to where there are no association types to choose from.
return(null);
}
Exception exception = null;
try {
var associateResponse = await this.channel.RequestAsync(associateRequest, cancellationToken);
var associateSuccessfulResponse = associateResponse as IAssociateSuccessfulResponseRelyingParty;
var associateUnsuccessfulResponse = associateResponse as AssociateUnsuccessfulResponse;
if (associateSuccessfulResponse != null)
{
Association association = associateSuccessfulResponse.CreateAssociationAtRelyingParty(associateRequest);
this.associationStore.StoreAssociation(provider.Uri, association);
return(association);
}
else if (associateUnsuccessfulResponse != null)
{
if (string.IsNullOrEmpty(associateUnsuccessfulResponse.AssociationType))
{
Logger.OpenId.Debug("Provider rejected an association request and gave no suggestion as to an alternative association type. Giving up.");
return(null);
}
if (!this.securitySettings.IsAssociationInPermittedRange(Protocol.Lookup(provider.Version), associateUnsuccessfulResponse.AssociationType))
{
Logger.OpenId.DebugFormat("Provider rejected an association request and suggested '{0}' as an association to try, which this Relying Party does not support. Giving up.", associateUnsuccessfulResponse.AssociationType);
return(null);
}
if (retriesRemaining <= 0)
{
Logger.OpenId.Debug("Unable to agree on an association type with the Provider in the allowed number of retries. Giving up.");
return(null);
}
// Make sure the Provider isn't suggesting an incompatible pair of association/session types.
Protocol protocol = Protocol.Lookup(provider.Version);
ErrorUtilities.VerifyProtocol(
HmacShaAssociation.IsDHSessionCompatible(protocol, associateUnsuccessfulResponse.AssociationType, associateUnsuccessfulResponse.SessionType),
OpenIdStrings.IncompatibleAssociationAndSessionTypes,
associateUnsuccessfulResponse.AssociationType,
associateUnsuccessfulResponse.SessionType);
associateRequest = AssociateRequestRelyingParty.Create(this.securitySettings, provider, associateUnsuccessfulResponse.AssociationType, associateUnsuccessfulResponse.SessionType);
return(await this.CreateNewAssociationAsync(provider, associateRequest, retriesRemaining - 1, cancellationToken));
}
else
{
throw new ProtocolException(MessagingStrings.UnexpectedMessageReceivedOfMany);
}
} catch (ProtocolException ex) {
exception = ex;
}
Assumes.NotNull(exception);
// If the association failed because the remote server can't handle Expect: 100 Continue headers,
// then our web request handler should have already accomodated for future calls. Go ahead and
// immediately make one of those future calls now to try to get the association to succeed.
if (UntrustedWebRequestHandler.IsExceptionFrom417ExpectationFailed(exception))
{
return(await this.CreateNewAssociationAsync(provider, associateRequest, retriesRemaining - 1, cancellationToken));
}
// Since having associations with OPs is not totally critical, we'll log and eat
// the exception so that auth may continue in dumb mode.
Logger.OpenId.ErrorFormat("An error occurred while trying to create an association with {0}. {1}", provider.Uri, exception);
return(null);
}