/// <summary>
/// Logs an ignored signature validation.
/// </summary>
/// <param name="logger">The <see cref="ILogger"/>.</param>
/// <param name="result">The <see cref="SignatureValidationResult"/>.</param>
/// <param name="ex">The <see cref="Exception"/>, if any.</param>
public static void SignatureValidationIgnored(this ILogger logger, SignatureValidationResult result, Exception ex = null)
{
_signatureValidationIgnored(
logger,
result?.Status ?? SignatureValidationResultStatus.Disabled,
ex);
}
/// <summary>
/// Logs a successful signature validation.
/// </summary>
/// <param name="logger">The <see cref="ILogger"/>.</param>
/// <param name="result">The <see cref="SignatureValidationResult"/>.</param>
/// <param name="ex">The <see cref="Exception"/>, if any.</param>
public static void SignatureValidationSucceeded(this ILogger logger, SignatureValidationResult result, Exception ex = null)
{
_signatureValidationSucceeded(
logger,
result?.Status ?? SignatureValidationResultStatus.OK,
result?.ClientId,
ex);
}
/// <summary>
/// Logs a failed signature validation.
/// </summary>
/// <param name="logger">The <see cref="ILogger"/>.</param>
/// <param name="result">The <see cref="SignatureValidationResult"/>.</param>
/// <param name="ex">The <see cref="Exception"/>, if any.</param>
public static void SignatureValidationFailed(this ILogger logger, SignatureValidationResult result, Exception ex = null)
{
_signatureValidationFailed(
logger,
result?.Status ?? SignatureValidationResultStatus.InternalError,
result?.ServerTimestamp ?? 0,
result?.SignatureValue,
result?.ClientId,
result?.ComputedSignature,
result?.SignatureBodySource == null ? null : Convert.ToBase64String(result.SignatureBodySource),
ex);
}
/// <inheritdoc />
public async Task <SignatureValidationResult> Validate(HttpRequest request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
var serverTimestamp = _clock.UtcNow.ToUnixTimeSeconds();
SignatureValidationResult result;
if (_options.Disabled)
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.Disabled,
serverTimestamp);
_logger.SignatureValidationIgnored(result);
return(result);
}
var headerValue = request.Headers[_options.HeaderName];
if (string.IsNullOrWhiteSpace(headerValue))
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.HeaderNotFound,
serverTimestamp);
_logger.SignatureValidationFailed(result);
return(result);
}
var signatureValue = headerValue.ToString().Trim();
var headerMatch = _signaturePatternParser.Match(signatureValue);
if (!headerMatch.Success)
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.HeaderParseError,
serverTimestamp,
signatureValue: signatureValue);
_logger.SignatureValidationFailed(result);
return(result);
}
var signatureComponents = new SignatureValueComponents
{
ClientId = headerMatch.Groups["ClientId"]?.Value,
Nonce = headerMatch.Groups["Nonce"]?.Value,
Timestamp = long.Parse(headerMatch.Groups["Timestamp"]?.Value ?? "0", CultureInfo.InvariantCulture),
SignatureBody = headerMatch.Groups["SignatureBody"]?.Value,
};
var clientOptions = _options.Clients.FirstOrDefault(x => string.Equals(x.ClientId, signatureComponents.ClientId, StringComparison.Ordinal));
if (clientOptions == null)
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.ClientIdNotFound,
serverTimestamp,
signatureValue: signatureValue,
clientId: signatureComponents.ClientId);
_logger.SignatureValidationFailed(result);
return(result);
}
if (await _nonceRepository.Exists(signatureComponents.Nonce))
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.NonceHasBeenUsedBefore,
serverTimestamp,
signatureValue: signatureValue,
clientId: clientOptions.ClientId);
_logger.SignatureValidationFailed(result);
return(result);
}
if (Math.Abs(serverTimestamp - signatureComponents.Timestamp) > _options.ClockSkew.TotalSeconds)
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.TimestampIsOff,
serverTimestamp,
signatureValue: signatureValue,
clientId: clientOptions.ClientId);
_logger.SignatureValidationFailed(result);
return(result);
}
var signatureBodySourceComponents = clientOptions.SignatureBodySourceComponents.Any()
? clientOptions.SignatureBodySourceComponents
: DefaultConstants.SignatureBodySourceComponents;
byte[] body = null;
if (signatureBodySourceComponents.Contains(SignatureBodySourceComponents.Body))
{
#if NETCOREAPP2_1
request.EnableRewind();
#endif
#if NETCOREAPP3_0
request.EnableBuffering();
#endif
request.Body.Seek(0, SeekOrigin.Begin);
using (var memoryStream = _memoryStreamManager.GetStream())
{
await request.Body.CopyToAsync(memoryStream);
body = memoryStream.ToArray();
}
request.Body.Seek(0, SeekOrigin.Begin);
}
var signatureBodySourceParameters = new SignatureBodySourceParameters(
request.Method,
new Uri($"{request.Scheme}://{request.Host}{request.Path}{request.QueryString}"),
request.Headers.ToDictionary(x => x.Key, x => x.Value.ToString()),
signatureComponents.Nonce,
signatureComponents.Timestamp,
clientOptions.ClientId,
signatureBodySourceComponents,
body);
var signatureBodySource = await _signatureBodySourceBuilder.Build(signatureBodySourceParameters);
var signatureBodyParameters = new SignatureBodyParameters(signatureBodySource, clientOptions.ClientSecret);
var signature = await _signatureBodySigner.Sign(signatureBodyParameters);
if (!string.Equals(signature, signatureComponents.SignatureBody, StringComparison.Ordinal))
{
result = new SignatureValidationResult(
SignatureValidationResultStatus.SignatureDoesntMatch,
serverTimestamp,
signatureValue: signatureValue,
clientId: clientOptions.ClientId,
computedSignature: signature,
signatureBodySource: signatureBodySource);
_logger.SignatureValidationFailed(result);
return(result);
}
await _nonceRepository.Add(signatureComponents.Nonce);
result = new SignatureValidationResult(
SignatureValidationResultStatus.OK,
serverTimestamp,
signatureValue: signatureValue,
clientId: clientOptions.ClientId,
computedSignature: signature);
_logger.SignatureValidationSucceeded(result);
return(result);
}
/// <summary>
/// Initializes a new instance of the <see cref="RequestsSignatureValidationException"/> class with a specified <see cref="SignatureValidationResult"/>.
/// </summary>
/// <param name="result">The <see cref="SignatureValidationResult"/>.</param>
public RequestsSignatureValidationException(SignatureValidationResult result)
: base(result?.Status.ToString())
{
Result = result;
}