private static async Task <HttpResponseMessage> SendWithNtAuthAsync(HttpRequestMessage request, Uri authUri, bool async, ICredentials credentials, bool isProxyAuth, HttpConnection connection, HttpConnectionPool connectionPool, CancellationToken cancellationToken)
{
HttpResponseMessage response = await InnerSendAsync(request, async, isProxyAuth, connectionPool, connection, cancellationToken).ConfigureAwait(false);
if (!isProxyAuth && connection.Kind == HttpConnectionKind.Proxy && !ProxySupportsConnectionAuth(response))
{
// Proxy didn't indicate that it supports connection-based auth, so we can't proceed.
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Error(connection, $"Proxy doesn't support connection-based auth, uri={authUri}");
}
return(response);
}
if (TryGetAuthenticationChallenge(response, isProxyAuth, authUri, credentials, out AuthenticationChallenge challenge))
{
if (challenge.AuthenticationType == AuthenticationType.Negotiate ||
challenge.AuthenticationType == AuthenticationType.Ntlm)
{
bool isNewConnection = false;
bool needDrain = true;
try
{
if (response.Headers.ConnectionClose.GetValueOrDefault())
{
// Server is closing the connection and asking us to authenticate on a new connection.
// First, detach the current connection from the pool. This means it will no longer count against the connection limit.
// Instead, it will be replaced by the new connection below.
connection.DetachFromPool();
connection = await connectionPool.CreateHttp11ConnectionAsync(request, async, cancellationToken).ConfigureAwait(false);
connection !.Acquire();
isNewConnection = true;
needDrain = false;
}
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Info(connection, $"Authentication: {challenge.AuthenticationType}, Uri: {authUri.AbsoluteUri}");
}
// Calculate SPN (Service Principal Name) using the host name of the request.
// Use the request's 'Host' header if available. Otherwise, use the request uri.
// Ignore the 'Host' header if this is proxy authentication since we need to use
// the host name of the proxy itself for SPN calculation.
string hostName;
if (!isProxyAuth && request.HasHeaders && request.Headers.Host != null)
{
// Use the host name without any normalization.
hostName = request.Headers.Host;
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Info(connection, $"Authentication: {challenge.AuthenticationType}, Host: {hostName}");
}
}
else
{
// Need to use FQDN normalized host so that CNAME's are traversed.
// Use DNS to do the forward lookup to an A (host) record.
// But skip DNS lookup on IP literals. Otherwise, we would end up
// doing an unintended reverse DNS lookup.
UriHostNameType hnt = authUri.HostNameType;
if (hnt == UriHostNameType.IPv6 || hnt == UriHostNameType.IPv4)
{
hostName = authUri.IdnHost;
}
else
{
IPHostEntry result = await Dns.GetHostEntryAsync(authUri.IdnHost, cancellationToken).ConfigureAwait(false);
hostName = result.HostName;
}
if (!isProxyAuth && !authUri.IsDefaultPort && UsePortInSpn)
{
hostName = string.Create(null, stackalloc char[128], $"{hostName}:{authUri.Port}");
}
}
string spn = "HTTP/" + hostName;
if (NetEventSource.Log.IsEnabled())
{
NetEventSource.Info(connection, $"Authentication: {challenge.AuthenticationType}, SPN: {spn}");
}
ProtectionLevel requiredProtectionLevel = ProtectionLevel.None;
// When connecting to proxy server don't enforce the integrity to avoid
// compatibility issues. The assumption is that the proxy server comes
// from a trusted source. On macOS we always need to enforce the integrity
// to avoid the GSSAPI implementation generating corrupted authentication
// tokens.
if (!isProxyAuth || OperatingSystem.IsMacOS())
{
requiredProtectionLevel = ProtectionLevel.Sign;
}
NegotiateAuthenticationClientOptions authClientOptions = new NegotiateAuthenticationClientOptions
{
Package = challenge.SchemeName,
Credential = challenge.Credential,
TargetName = spn,
RequiredProtectionLevel = requiredProtectionLevel,
Binding = connection.TransportContext?.GetChannelBinding(ChannelBindingKind.Endpoint)
};
using NegotiateAuthentication authContext = new NegotiateAuthentication(authClientOptions);
string?challengeData = challenge.ChallengeData;
NegotiateAuthenticationStatusCode statusCode;
while (true)
{
string?challengeResponse = authContext.GetOutgoingBlob(challengeData, out statusCode);
if (statusCode > NegotiateAuthenticationStatusCode.ContinueNeeded || challengeResponse == null)
{
// Response indicated denial even after login, so stop processing and return current response.
break;
}
if (needDrain)
{
await connection.DrainResponseAsync(response !, cancellationToken).ConfigureAwait(false);
}
SetRequestAuthenticationHeaderValue(request, new AuthenticationHeaderValue(challenge.SchemeName, challengeResponse), isProxyAuth);
response = await InnerSendAsync(request, async, isProxyAuth, connectionPool, connection, cancellationToken).ConfigureAwait(false);
if (authContext.IsAuthenticated || !TryGetChallengeDataForScheme(challenge.SchemeName, GetResponseAuthenticationHeaderValues(response, isProxyAuth), out challengeData))
{
break;
}
if (!IsAuthenticationChallenge(response, isProxyAuth))
{
// Tail response for Negoatiate on successful authentication. Validate it before we proceed.
authContext.GetOutgoingBlob(challengeData, out statusCode);
if (statusCode > NegotiateAuthenticationStatusCode.ContinueNeeded)
{
isNewConnection = false;
connection.Dispose();
throw new HttpRequestException(SR.Format(SR.net_http_authvalidationfailure, statusCode), null, HttpStatusCode.Unauthorized);
}
break;
}
needDrain = true;
}
}
finally
{
if (isNewConnection)
{
connection !.Release();
}
}
}
}
return(response !);
}
internal static async Task HandleAuthenticationRequest(LoopbackServer.Connection connection, bool useNtlm, bool useNegotiate, bool closeConnection)
{
HttpRequestData request = await connection.ReadRequestDataAsync();
NegotiateAuthentication authContext = null;
string authHeader = null;
foreach (HttpHeaderData header in request.Headers)
{
if (header.Name == "Authorization")
{
authHeader = header.Value;
break;
}
}
if (string.IsNullOrEmpty(authHeader))
{
// This is initial request, we reject with showing supported mechanisms.
authHeader = string.Empty;
if (useNtlm)
{
authHeader += NtlmAuthHeader + "\r\n";
}
if (useNegotiate)
{
authHeader += NegotiateAuthHeader + "\r\n";
}
await connection.SendResponseAsync(HttpStatusCode.Unauthorized, authHeader).ConfigureAwait(false);
connection.CompleteRequestProcessing();
// Read next requests and fall-back to loop bellow to process it.
request = await connection.ReadRequestDataAsync();
}
NegotiateAuthenticationStatusCode statusCode;
do
{
foreach (HttpHeaderData header in request.Headers)
{
if (header.Name == "Authorization")
{
authHeader = header.Value;
break;
}
}
Assert.NotNull(authHeader);
var tokens = authHeader.Split(' ', 2, StringSplitOptions.TrimEntries);
// Should be type and base64 encoded blob
Assert.Equal(2, tokens.Length);
authContext ??= new NegotiateAuthentication(new NegotiateAuthenticationServerOptions {
Package = tokens[0]
});
byte[]? outBlob = authContext.GetOutgoingBlob(Convert.FromBase64String(tokens[1]), out statusCode);
if (outBlob != null && statusCode == NegotiateAuthenticationStatusCode.ContinueNeeded)
{
authHeader = $"WWW-Authenticate: {tokens[0]} {Convert.ToBase64String(outBlob)}\r\n";
await connection.SendResponseAsync(HttpStatusCode.Unauthorized, authHeader);
connection.CompleteRequestProcessing();
request = await connection.ReadRequestDataAsync();
}
}while (statusCode == NegotiateAuthenticationStatusCode.ContinueNeeded);
if (statusCode == NegotiateAuthenticationStatusCode.Completed)
{
// If authentication succeeded ask Windows about the identity and send it back as custom header.
IIdentity identity = authContext.RemoteIdentity;
authHeader = $"{UserHeaderName}: {identity.Name}\r\n";
if (closeConnection)
{
authHeader += "Connection: close\r\n";
}
await connection.SendResponseAsync(HttpStatusCode.OK, authHeader, "foo");
authContext.Dispose();
}
else
{
await connection.SendResponseAsync(HttpStatusCode.Forbidden, "Connection: close\r\n", "boo");
}
}