/// <summary>
/// Returns an AuthenticationResult object corresponding to the result of authentication done
/// using the client supplied artifacts in the HTTP authorization header in hawk scheme.
/// </summary>
/// <param name="now">Current UNIX time in milliseconds.</param>
/// <param name="request">Request object.</param>
/// <param name="options">Hawk authentication options</param>
/// <returns></returns>
internal static async Task <AuthenticationResult> AuthenticateAsync(ulong now, IRequestMessage request, Options options)
{
ArtifactsContainer artifacts = null;
Credential credential = null;
if (request.HasValidHawkScheme())
{
if (ArtifactsContainer.TryParse(request.Authorization.Parameter, out artifacts))
{
if (artifacts != null && artifacts.AreClientArtifactsValid)
{
credential = options.CredentialsCallback(artifacts.Id);
if (credential != null && credential.IsValid)
{
var normalizedRequest = new NormalizedRequest(request, artifacts);
var crypto = new Cryptographer(normalizedRequest, artifacts, credential);
// Request body is needed only when payload hash is present in the request
string body = null;
if (artifacts.PayloadHash != null && artifacts.PayloadHash.Length > 0)
{
body = await request.ReadBodyAsStringAsync();
}
if (crypto.IsSignatureValid(body, request.ContentType)) // MAC and hash checks
{
if (IsTimestampFresh(now, artifacts, options))
{
// If you get this far, you are authentic. Welcome and thanks for flying Hawk!
return(new AuthenticationResult()
{
IsAuthentic = true,
Artifacts = artifacts,
Credential = credential,
ApplicationSpecificData = artifacts.ApplicationSpecificData
});
}
else
{
// Authentic but for the timestamp freshness.
// Give a chance to the client to correct the clocks skew.
var timestamp = new NormalizedTimestamp(DateTime.UtcNow, credential, options.LocalTimeOffsetMillis);
request.ChallengeParameter = timestamp.ToWwwAuthenticateHeaderParameter();
}
}
}
}
}
}
return(new AuthenticationResult()
{
IsAuthentic = false
});
}
/// <summary>
/// Returns an AuthenticationResult object corresponding to the result of authentication done
/// using the client supplied artifacts in the HTTP authorization header in hawk scheme.
/// </summary>
/// <param name="now">Current UNIX time in milliseconds.</param>
/// <param name="request">Request object.</param>
/// <param name="callback">The callback function that returns a Credential object corresponding to the identifier passed in.</param>
/// <returns></returns>
internal static async Task <AuthenticationResult> AuthenticateAsync(ulong now, HttpRequestMessage request,
Func <string, Credential> callback)
{
ArtifactsContainer artifacts = null;
Credential credential = null;
if (request.HasValidHawkScheme())
{
if (ArtifactsContainer.TryParse(request.Headers.Authorization.Parameter, out artifacts))
{
if (artifacts != null && artifacts.AreClientArtifactsValid)
{
credential = callback(artifacts.Id);
if (credential != null && credential.IsValid)
{
var normalizedRequest = new NormalizedRequest(request, artifacts);
var crypto = new Cryptographer(normalizedRequest, artifacts, credential);
if (await crypto.IsSignatureValidAsync(request.Content)) // MAC and hash checks
{
if (IsTimestampFresh(now, artifacts))
{
// If you get this far, you are authentic. Welcome and thanks for flying Hawk!
return(new AuthenticationResult()
{
IsAuthentic = true,
Artifacts = artifacts,
Credential = credential,
ApplicationSpecificData = artifacts.ApplicationSpecificData
});
}
else
{
// Authentic but for the timestamp freshness.
// Give a chance to the client to correct the clocks skew.
var timestamp = new NormalizedTimestamp(DateTime.UtcNow, credential);
request.PutChallengeParameter(timestamp.ToWwwAuthenticateHeaderParameter());
}
}
}
}
}
}
return(new AuthenticationResult()
{
IsAuthentic = false
});
}
