internal async Task <TokenResponseValidationResult> ValidateTokenResponseAsync(TokenResponse response, AuthorizeState state, bool requireIdentityToken, CancellationToken cancellationToken = default)
{
_logger.LogTrace("ValidateTokenResponse");
// token response must contain an access token
if (response.AccessToken.IsMissing())
{
return(new TokenResponseValidationResult("Access token is missing on token response."));
}
if (requireIdentityToken)
{
// token response must contain an identity token (openid scope is mandatory)
if (response.IdentityToken.IsMissing())
{
return(new TokenResponseValidationResult("Identity token is missing on token response."));
}
}
if (response.IdentityToken.IsPresent())
{
// if identity token is present, it must be valid
var validationResult = await _tokenValidator.ValidateAsync(response.IdentityToken, cancellationToken);
if (validationResult.IsError)
{
return(new TokenResponseValidationResult(validationResult.Error ?? "Identity token validation error"));
}
// validate nonce
if (state != null)
{
if (!ValidateNonce(state.Nonce, validationResult.User))
{
return(new TokenResponseValidationResult("Invalid nonce."));
}
}
// validate at_hash
var atHash = validationResult.User.FindFirst(JwtClaimTypes.AccessTokenHash);
if (atHash == null)
{
if (_options.Policy.RequireAccessTokenHash)
{
return(new TokenResponseValidationResult("at_hash is missing."));
}
}
else
{
if (!_crypto.ValidateHash(response.AccessToken, atHash.Value, validationResult.SignatureAlgorithm))
{
return(new TokenResponseValidationResult("Invalid access token hash."));
}
}
return(new TokenResponseValidationResult(validationResult));
}
return(new TokenResponseValidationResult((IdentityTokenValidationResult)null));
}
private async Task <ResponseValidationResult> ProcessHybridFlowResponseAsync(AuthorizeResponse authorizeResponse, AuthorizeState state, object extraParameters = null)
{
_logger.LogTrace("ProcessHybridFlowResponseAsync");
//////////////////////////////////////////////////////
// validate front-channel response
//////////////////////////////////////////////////////
// id_token must be present
if (authorizeResponse.IdentityToken.IsMissing())
{
return(new ResponseValidationResult("Missing identity token."));
}
// id_token must be valid
var frontChannelValidationResult = await _tokenValidator.ValidateAsync(authorizeResponse.IdentityToken);
if (frontChannelValidationResult.IsError)
{
return(new ResponseValidationResult(frontChannelValidationResult.Error ?? "Identity token validation error."));
}
// nonce must be valid
if (!ValidateNonce(state.Nonce, frontChannelValidationResult.User))
{
return(new ResponseValidationResult("Invalid nonce."));
}
// validate c_hash
var cHash = frontChannelValidationResult.User.FindFirst(JwtClaimTypes.AuthorizationCodeHash);
if (cHash == null)
{
if (_options.Policy.RequireAuthorizationCodeHash)
{
return(new ResponseValidationResult("c_hash is missing."));
}
}
else
{
if (!_crypto.ValidateHash(authorizeResponse.Code, cHash.Value, frontChannelValidationResult.SignatureAlgorithm))
{
return(new ResponseValidationResult("Invalid c_hash."));
}
}
//////////////////////////////////////////////////////
// process back-channel response
//////////////////////////////////////////////////////
// redeem code for tokens
var tokenResponse = await RedeemCodeAsync(authorizeResponse.Code, state, extraParameters);
if (tokenResponse.IsError)
{
return(new ResponseValidationResult(tokenResponse.Error));
}
// validate token response
var tokenResponseValidationResult = await ValidateTokenResponseAsync(tokenResponse, state);
if (tokenResponseValidationResult.IsError)
{
return(new ResponseValidationResult(tokenResponseValidationResult.Error));
}
// compare front & back channel subs
var frontChannelSub = frontChannelValidationResult.User.FindFirst(JwtClaimTypes.Subject).Value;
var backChannelSub = tokenResponseValidationResult.IdentityTokenValidationResult.User.FindFirst(JwtClaimTypes.Subject).Value;
if (!string.Equals(frontChannelSub, backChannelSub, StringComparison.Ordinal))
{
return(new ResponseValidationResult($"Subject on front-channel ({frontChannelSub}) does not match subject on back-channel ({backChannelSub})."));
}
return(new ResponseValidationResult
{
AuthorizeResponse = authorizeResponse,
TokenResponse = tokenResponse,
User = tokenResponseValidationResult.IdentityTokenValidationResult.User
});
}