public override async Task <CompleteRegistrationRequestValidationResult> Validate(NameValueCollection parameters, string accessToken = null)
{
Logger.LogDebug($"[{nameof(CompleteRegistrationRequestValidator)}] Started trusted device registration request validation.");
// The access token needs to be valid and have at least the openid scope.
var tokenValidationResult = await TokenValidator.ValidateAccessTokenAsync(accessToken, IdentityServerConstants.StandardScopes.OpenId);
if (tokenValidationResult.IsError)
{
return(Error(tokenValidationResult.Error, "Provided access token is not valid."));
}
// The access token must have at lease a 'sub' and 'client_id' claim.
var claimsToValidate = new[] {
JwtClaimTypes.Subject,
JwtClaimTypes.ClientId
};
foreach (var claim in claimsToValidate)
{
var claimValue = tokenValidationResult.Claims.SingleOrDefault(x => x.Type == claim)?.Value;
if (string.IsNullOrWhiteSpace(claimValue))
{
return(Error(OidcConstants.ProtectedResourceErrors.InvalidToken, $"Access token must contain the '{claim}' claim."));
}
}
// Get 'code' parameter and retrieve it from the store.
var code = parameters.Get(RegistrationRequestParameters.Code);
if (string.IsNullOrWhiteSpace(code))
{
return(Error(OidcConstants.TokenErrors.InvalidGrant, $"Parameter '{nameof(RegistrationRequestParameters.Code)}' is not specified."));
}
var authorizationCode = await CodeChallengeStore.GetAuthorizationCode(code);
if (authorizationCode == null)
{
return(Error(OidcConstants.TokenErrors.InvalidGrant, "Authorization code is invalid."));
}
// Validate that the consumer specified all required parameters.
var parametersToValidate = new List <string> {
RegistrationRequestParameters.CodeSignature,
RegistrationRequestParameters.CodeVerifier,
RegistrationRequestParameters.DeviceId,
RegistrationRequestParameters.DevicePlatform
};
if (authorizationCode.InteractionMode == InteractionMode.Fingerprint)
{
parametersToValidate.Add(RegistrationRequestParameters.PublicKey);
}
if (authorizationCode.InteractionMode == InteractionMode.Pin)
{
parametersToValidate.Add(RegistrationRequestParameters.Pin);
}
var otpAuthenticatedValue = tokenValidationResult.Claims.FirstOrDefault(x => x.Type == BasicClaimTypes.OtpAuthenticated)?.Value;
var otpAuthenticated = !string.IsNullOrWhiteSpace(otpAuthenticatedValue) && bool.Parse(otpAuthenticatedValue);
if (!otpAuthenticated)
{
parametersToValidate.Add(RegistrationRequestParameters.OtpCode);
}
foreach (var parameter in parametersToValidate)
{
var parameterValue = parameters.Get(parameter);
if (string.IsNullOrWhiteSpace(parameterValue))
{
return(Error(OidcConstants.TokenErrors.InvalidGrant, $"Parameter '{parameter}' is not specified."));
}
}
var isValidPlatform = Enum.TryParse(typeof(DevicePlatform), parameters.Get(RegistrationRequestParameters.DevicePlatform), out var platform);
if (!isValidPlatform)
{
return(Error(OidcConstants.TokenErrors.InvalidRequest, $"Parameter '{nameof(RegistrationRequestParameters.DevicePlatform)}' does not have a valid value."));
}
// Load client and validate that it allows the 'password' flow.
var client = await LoadClient(tokenValidationResult);
if (client == null)
{
return(Error(OidcConstants.AuthorizeErrors.UnauthorizedClient, $"Client is unknown or not enabled."));
}
if (client.AllowedGrantTypes.Except(Constants.RequiredGrantTypes).Any())
{
return(Error(OidcConstants.AuthorizeErrors.UnauthorizedClient, $"Client not authorized any of the following grant types: {string.Join(", ", Constants.RequiredGrantTypes)}"));
}
// Validate authorization code against code verifier given by the client.
var codeVerifier = parameters.Get(RegistrationRequestParameters.CodeVerifier);
var authorizationCodeValidationResult = await ValidateAuthorizationCode(code, authorizationCode, codeVerifier, parameters.Get(RegistrationRequestParameters.DeviceId), client);
if (authorizationCodeValidationResult.IsError)
{
return(Error(authorizationCodeValidationResult.Error, authorizationCodeValidationResult.ErrorDescription));
}
// Validate given public key against signature for fingerprint.
string publicKey = null;
if (authorizationCode.InteractionMode == InteractionMode.Fingerprint)
{
publicKey = parameters.Get(RegistrationRequestParameters.PublicKey);
var codeSignature = parameters.Get(RegistrationRequestParameters.CodeSignature);
var publicKeyValidationResult = ValidateSignature(publicKey, code, codeSignature);
if (publicKeyValidationResult.IsError)
{
return(Error(publicKeyValidationResult.Error, publicKeyValidationResult.ErrorDescription));
}
}
// Find requested scopes.
var requestedScopes = tokenValidationResult.Claims.Where(claim => claim.Type == JwtClaimTypes.Scope).Select(claim => claim.Value).ToList();
// Create principal from incoming access token excluding protocol claims.
var claims = tokenValidationResult.Claims.Where(x => !Constants.ProtocolClaimsFilter.Contains(x.Type));
var principal = Principal.Create("TrustedDevice", claims.ToArray());
var userId = tokenValidationResult.Claims.Single(x => x.Type == JwtClaimTypes.Subject).Value;
// Validate OTP code, if needed.
if (!otpAuthenticated)
{
var totpResult = await TotpService.Verify(
principal : principal,
code : parameters.Get(RegistrationRequestParameters.OtpCode),
purpose : Constants.TrustedDeviceOtpPurpose(userId, authorizationCode.DeviceId)
);
if (!totpResult.Success)
{
return(Error(totpResult.Error));
}
}
// Finally return result.
return(new CompleteRegistrationRequestValidationResult {
IsError = false,
Client = client,
DeviceId = authorizationCode.DeviceId,
DeviceName = parameters.Get(RegistrationRequestParameters.DeviceName),
DevicePlatform = (DevicePlatform)platform,
InteractionMode = authorizationCode.InteractionMode,
Pin = parameters.Get(RegistrationRequestParameters.Pin),
Principal = principal,
PublicKey = publicKey,
RequestedScopes = requestedScopes,
UserId = userId
});
}
public async Task ValidateAsync(ExtensionGrantValidationContext context)
{
var parameters = context.Request.Raw;
var deviceId = parameters.Get(RegistrationRequestParameters.DeviceId);
if (string.IsNullOrWhiteSpace(deviceId))
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, $"Parameter '{RegistrationRequestParameters.DeviceId}' is not specified.");
return;
}
// Load device.
var device = await UserDeviceStore.GetByDeviceId(deviceId);
if (device == null)
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, "Device is unknown.");
return;
}
// If a code is present we are heading towards fingerprint login.
var code = parameters.Get(RegistrationRequestParameters.Code);
if (!string.IsNullOrWhiteSpace(code))
{
// Retrieve authorization code from the store.
var authorizationCode = await CodeChallengeStore.GetAuthorizationCode(code);
if (authorizationCode == null)
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, "Authorization code is invalid.");
return;
}
// Validate that the consumer specified all required parameters.
var parametersToValidate = new List <string> {
RegistrationRequestParameters.CodeSignature,
RegistrationRequestParameters.CodeVerifier
};
foreach (var parameter in parametersToValidate)
{
var parameterValue = parameters.Get(parameter);
if (string.IsNullOrWhiteSpace(parameterValue))
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, $"Parameter '{parameter}' is not specified.");
return;
}
}
// Validate authorization code against code verifier given by the client.
var codeVerifier = parameters.Get(RegistrationRequestParameters.CodeVerifier);
var authorizationCodeValidationResult = await ValidateAuthorizationCode(code, authorizationCode, codeVerifier, deviceId, context.Request.Client);
if (authorizationCodeValidationResult.IsError)
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, authorizationCodeValidationResult.ErrorDescription);
return;
}
// Validate given public key against signature for fingerprint.
var publicKey = parameters.Get(RegistrationRequestParameters.PublicKey);
var codeSignature = parameters.Get(RegistrationRequestParameters.CodeSignature);
var publicKeyValidationResult = ValidateSignature(publicKey, code, codeSignature);
if (publicKeyValidationResult.IsError)
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, publicKeyValidationResult.ErrorDescription);
return;
}
await UserDeviceStore.UpdateDevicePublicKey(device, publicKey);
// Grant access token.
context.Result = new GrantValidationResult(authorizationCode.Subject.GetSubjectId(), GrantType);
await UserDeviceStore.UpdateLastSignInDate(device);
}
var pin = parameters.Get(RegistrationRequestParameters.Pin);
if (!string.IsNullOrWhiteSpace(pin))
{
var result = DevicePasswordHasher.VerifyHashedPassword(device, device.Password, pin);
if (result == PasswordVerificationResult.Failed)
{
context.Result = new GrantValidationResult(TokenRequestErrors.InvalidGrant, "Wrong pin.");
return;
}
context.Result = new GrantValidationResult(device.UserId, GrantType);
await UserDeviceStore.UpdateLastSignInDate(device);
}
}