internal static (string value, OpenIdConnectMessage error) ValidateParameterIsUnique(
IDictionary <string, string[]> requestParameters,
string parameterName,
ProtocolErrorProvider provider)
{
if (requestParameters.TryGetValue(parameterName, out var currentParameter))
{
if (currentParameter.Length > 1)
{
return(null, provider.TooManyParameters(parameterName));
}
var parameterValue = currentParameter.SingleOrDefault();
if (string.IsNullOrEmpty(parameterValue))
{
return(null, provider.MissingRequiredParameter(parameterName));
}
return(parameterValue, null);
}
else
{
return(null, provider.MissingRequiredParameter(parameterName));
}
}
public async Task FailsToCreateAuthorizationRequest_IfClientId_IsMissing()
{
// Arrange
var parameters = new Dictionary <string, string[]>
{
[OpenIdConnectParameterNames.State] = new[] { "state" }
};
var expectedError = new AuthorizationRequestError(ProtocolErrorProvider.MissingRequiredParameter(OpenIdConnectParameterNames.ClientId), null, null);
expectedError.Message.State = "state";
var factory = CreateAuthorizationRequestFactory();
// Act
var result = await factory.CreateAuthorizationRequestAsync(parameters);
// Assert
Assert.False(result.IsValid);
Assert.Equal(expectedError, result.Error, IdentityServiceErrorComparer.Instance);
Assert.Null(result.Error.RedirectUri);
Assert.Null(result.Error.ResponseMode);
}
private async Task <OpenIdConnectMessage> ValidateAuthorizationCode(
IDictionary <string, string[]> requestParameters,
string clientId,
AuthorizationGrant consentGrant)
{
if (!(consentGrant.Token is AuthorizationCode code))
{
throw new InvalidOperationException("Granted token must be an authorization code.");
}
var(redirectUri, redirectUriError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.RedirectUri, _errorProvider);
if (redirectUriError != null)
{
return(redirectUriError);
}
var tokenRedirectUri = code.RedirectUri;
if (redirectUri == null && tokenRedirectUri != null)
{
return(_errorProvider.MissingRequiredParameter(OpenIdConnectParameterNames.RedirectUri));
}
if (!string.Equals(redirectUri, tokenRedirectUri, StringComparison.Ordinal))
{
return(_errorProvider.MismatchedRedirectUrl(redirectUri));
}
var resolution = await _redirectUriValidator.ResolveRedirectUriAsync(clientId, redirectUri);
if (!resolution.IsValid)
{
return(_errorProvider.InvalidRedirectUri(redirectUri));
}
if (code.CodeChallenge != null)
{
if (!ProofOfKeyForCodeExchangeChallengeMethods.SHA256.Equals(code.CodeChallengeMethod, StringComparison.Ordinal))
{
throw new InvalidOperationException("Unsupported code challenge method.");
}
var(verifier, verifierError) = RequestParametersHelper.ValidateParameterIsUnique(requestParameters, ProofOfKeyForCodeExchangeParameterNames.CodeVerifier, _errorProvider);
if (verifierError != null)
{
return(verifierError);
}
// code-verifier = [a-zA-Z0-9\-._~]{43,128}
if (verifier.Length < 43 || verifier.Length > 128)
{
return(_errorProvider.InvalidCodeVerifier());
}
for (var i = 0; i < verifier.Length; i++)
{
if (verifier[i] > 127 || !ValidCodeVerifierCharacters[verifier[i]])
{
return(_errorProvider.InvalidCodeVerifier());
}
}
if (!string.Equals(code.CodeChallenge, GetComputedChallenge(verifier), StringComparison.Ordinal))
{
return(_errorProvider.InvalidCodeVerifier());
}
}
return(null);
}
public async Task <AuthorizationRequest> CreateAuthorizationRequestAsync(IDictionary <string, string[]> requestParameters)
{
// Parameters sent without a value MUST be treated as if they were
// omitted from the request.The authorization server MUST ignore
// unrecognized request parameters.Request and response parameters
// MUST NOT be included more than once.
// Validate that we only got send one state property as it needs to be included in all responses (including error ones)
var(state, stateError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.State, _errorProvider);
// Start by validating the client_id and redirect_uri as any of them being invalid indicates that we need to
// return a 400 response instead of a 302 response with the error. This is signaled by the result not containing
// a url to redirect to.
var(clientId, redirectUri, clientError) = await ValidateClientIdAndRedirectUri(requestParameters, state);
if (clientError != null)
{
// Send first the state error if there was one.
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(
stateError ?? clientError,
redirectUri: null,
responseMode: null)));
}
// We need to determine what response mode to use to send the errors in case there are any.
// In case the response type and response modes are valid, we should use those values when
// notifying clients of the errors.
// In case there is an issue with the response type or the response mode we need to determine
// how to notify the relying party of the errors.
// We can divide this in two situations:
// The response mode is invalid:
// * We ignore the response mode and base our response based on the response type specified.
// If a token was requested we send the error response on the fragment of the redirect uri.
// If no token was requested we send the error response on the query of the redirect uri.
// The response type is invalid:
// * We try to determine if this is a hybrid or implicit flow:
// If the invalid response type contained a request for an id_token or an access_token, or
// contained more than one space separated value, we send the response on the fragment,
// unless the response mode is specified and form_post.
// If the invalid response type only contained one value and we can not determine is an
// implicit request flow, we return the error on the query string unless the response mode
// is specified and form_post or fragment.
var(responseType, parsedResponseType, tokenRequested, responseTypeError) = ValidateResponseType(requestParameters);
var(responseMode, responseModeError) = ValidateResponseMode(requestParameters);
var invalidCombinationError = ValidateResponseModeTypeCombination(responseType, tokenRequested, responseMode);
if (responseModeError != null || responseMode == null)
{
responseMode = GetResponseMode(parsedResponseType, tokenRequested);
}
if (responseTypeError != null)
{
responseTypeError.State = state;
return(AuthorizationRequest.Invalid(
new AuthorizationRequestError(stateError ?? responseTypeError, redirectUri, responseMode)));
}
if (responseModeError != null)
{
responseModeError.State = state;
return(AuthorizationRequest.Invalid(
new AuthorizationRequestError(stateError ?? responseModeError, redirectUri, responseMode)));
}
if (invalidCombinationError != null)
{
invalidCombinationError.State = state;
return(AuthorizationRequest.Invalid(
new AuthorizationRequestError(stateError ?? invalidCombinationError, redirectUri, responseMode)));
}
var(nonce, nonceError) = tokenRequested ?
RequestParametersHelper.ValidateParameterIsUnique(requestParameters, OpenIdConnectParameterNames.Nonce, _errorProvider) :
RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.Nonce, _errorProvider);
if (nonceError != null)
{
nonceError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(nonceError, redirectUri, responseMode)));
}
var(scope, scopeError) = RequestParametersHelper.ValidateParameterIsUnique(requestParameters, OpenIdConnectParameterNames.Scope, _errorProvider);
if (scopeError != null)
{
scopeError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(scopeError, redirectUri, responseMode)));
}
var parsedScope = scope.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var allWhiteSpace = true;
for (int i = 0; i < parsedScope.Length; i++)
{
allWhiteSpace = string.IsNullOrWhiteSpace(parsedScope[i]);
if (!allWhiteSpace)
{
break;
}
}
if (allWhiteSpace)
{
scopeError = _errorProvider.MissingRequiredParameter(OpenIdConnectParameterNames.Scope);
scopeError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(
scopeError,
redirectUri,
responseMode)));
}
if (parsedResponseType.Contains(OpenIdConnectResponseType.IdToken) && !parsedScope.Contains(OpenIdConnectScope.OpenId))
{
scopeError = _errorProvider.MissingOpenIdScope();
scopeError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(
scopeError,
redirectUri,
responseMode)));
}
var resolvedScopes = await _scopeValidator.ResolveScopesAsync(clientId, parsedScope);
if (!resolvedScopes.IsValid)
{
resolvedScopes.Error.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(resolvedScopes.Error, redirectUri, responseMode)));
}
var(prompt, promptError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, OpenIdConnectParameterNames.Prompt, _errorProvider);
if (promptError != null)
{
promptError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(promptError, redirectUri, responseMode)));
}
if (prompt != null)
{
var parsedPrompt = prompt.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
promptError = ValidatePrompt(parsedPrompt);
if (promptError != null)
{
promptError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(promptError, redirectUri, responseMode)));
}
}
var(codeChallenge, codeChallengeError) = RequestParametersHelper.ValidateOptionalParameterIsUnique(requestParameters, ProofOfKeyForCodeExchangeParameterNames.CodeChallenge, _errorProvider);
if (codeChallengeError != null)
{
codeChallengeError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(codeChallengeError, redirectUri, responseMode)));
}
if (codeChallenge != null)
{
// The code challenge needs to be 43 characters long as its the result of Base64URLEncode(SHA256(code_verifier)).
// We do this check here because the code challenge might get saved in the serialized authorization code and we
// want to prevent it from getting unnecessarily big.
if (codeChallenge.Length != 43)
{
var invalidCodeChallenge = _errorProvider.InvalidCodeChallenge();
invalidCodeChallenge.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(
invalidCodeChallenge,
redirectUri,
responseMode)));
}
var(codeChallengeMethod, codeChallengeMethodError) = RequestParametersHelper.ValidateParameterIsUnique(requestParameters, ProofOfKeyForCodeExchangeParameterNames.CodeChallengeMethod, _errorProvider);
if (codeChallengeMethodError != null)
{
codeChallengeMethodError.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(codeChallengeMethodError, redirectUri, responseMode)));
}
if (!codeChallengeMethod.Equals(ProofOfKeyForCodeExchangeChallengeMethods.SHA256, StringComparison.Ordinal))
{
var invalidChallengeMethod = _errorProvider.InvalidCodeChallengeMethod(codeChallengeMethod);
invalidChallengeMethod.State = state;
return(AuthorizationRequest.Invalid(new AuthorizationRequestError(invalidChallengeMethod, redirectUri, responseMode)));
}
}
var result = new OpenIdConnectMessage(requestParameters);
result.RequestType = OpenIdConnectRequestType.Authentication;
var requestGrants = new RequestGrants
{
Tokens = GetRequestedTokens(parsedResponseType, resolvedScopes.Scopes),
Scopes = resolvedScopes.Scopes.ToList(),
ResponseMode = responseMode,
RedirectUri = redirectUri
};
return(await ValidateRequestAsync(AuthorizationRequest.Valid(result, requestGrants)));
}