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Apache HttpClient Windows specific functionality
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* This will delegate negotiation to the windows machine.
*
*
* EXPERIMENTAL
*
*
* @since 4.4
*/
public class WindowsNegotiateScheme extends AuthSchemeBase {
private final Log log = LogFactory.getLog(getClass());
// NTLM or Negotiate
private final String scheme;
private final String servicePrincipalName;
private CredHandle clientCred;
private CtxtHandle sspiContext;
private boolean continueNeeded;
private String challenge;
public WindowsNegotiateScheme(final String scheme, final String servicePrincipalName) {
super();
this.scheme = (scheme == null) ? AuthSchemes.SPNEGO : scheme;
this.challenge = null;
this.continueNeeded = true;
this.servicePrincipalName = servicePrincipalName;
if (this.log.isDebugEnabled()) {
this.log.debug("Created WindowsNegotiateScheme using " + this.scheme);
}
}
public void dispose() {
if (clientCred != null && !clientCred.isNull()) {
final int rc = Secur32.INSTANCE.FreeCredentialsHandle(clientCred);
if (WinError.SEC_E_OK != rc) {
throw new Win32Exception(rc);
}
}
if (sspiContext != null && !sspiContext.isNull()) {
final int rc = Secur32.INSTANCE.DeleteSecurityContext(sspiContext);
if (WinError.SEC_E_OK != rc) {
throw new Win32Exception(rc);
}
}
continueNeeded = true; // waiting
clientCred = null;
sspiContext = null;
}
@Override
public void finalize() throws Throwable {
dispose();
super.finalize();
}
@Override
public String getSchemeName() {
return scheme;
}
// String parameters not supported
@Override
public String getParameter(final String name) {
return null;
}
// NTLM/Negotiate do not support authentication realms
@Override
public String getRealm() {
return null;
}
@Override
public boolean isConnectionBased() {
return true;
}
@Override
protected void parseChallenge(
final CharArrayBuffer buffer,
final int beginIndex,
final int endIndex) throws MalformedChallengeException {
this.challenge = buffer.substringTrimmed(beginIndex, endIndex);
if (this.challenge.isEmpty()) {
if (clientCred != null) {
dispose(); // run cleanup first before throwing an exception otherwise can leak OS resources
if (continueNeeded) {
throw new RuntimeException("Unexpected token");
}
}
}
}
@Override
public Header authenticate(
final Credentials credentials,
final HttpRequest request,
final HttpContext context) throws AuthenticationException {
final String response;
if (clientCred == null) {
// ?? We don't use the credentials, should we allow anything?
if (!(credentials instanceof CurrentWindowsCredentials)) {
throw new InvalidCredentialsException(
"Credentials cannot be used for " + getSchemeName() + " authentication: "
+ credentials.getClass().getName());
}
// client credentials handle
try {
final String username = CurrentWindowsCredentials.getCurrentUsername();
final TimeStamp lifetime = new TimeStamp();
clientCred = new CredHandle();
final int rc = Secur32.INSTANCE.AcquireCredentialsHandle(username,
scheme, Sspi.SECPKG_CRED_OUTBOUND, null, null, null, null,
clientCred, lifetime);
if (WinError.SEC_E_OK != rc) {
throw new Win32Exception(rc);
}
final String targetName = getServicePrincipalName(context);
response = getToken(null, null, targetName);
} catch (final RuntimeException ex) {
failAuthCleanup();
if (ex instanceof Win32Exception) {
throw new AuthenticationException("Authentication Failed", ex);
} else {
throw ex;
}
}
} else if (this.challenge == null || this.challenge.isEmpty()) {
failAuthCleanup();
throw new AuthenticationException("Authentication Failed");
} else {
try {
final byte[] continueTokenBytes = Base64.decodeBase64(this.challenge);
final SecBufferDesc continueTokenBuffer = new SecBufferDesc(
Sspi.SECBUFFER_TOKEN, continueTokenBytes);
final String targetName = getServicePrincipalName(context);
response = getToken(this.sspiContext, continueTokenBuffer, targetName);
} catch (final RuntimeException ex) {
failAuthCleanup();
if (ex instanceof Win32Exception) {
throw new AuthenticationException("Authentication Failed", ex);
} else {
throw ex;
}
}
}
final CharArrayBuffer buffer = new CharArrayBuffer(scheme.length() + 30);
if (isProxy()) {
buffer.append(AUTH.PROXY_AUTH_RESP);
} else {
buffer.append(AUTH.WWW_AUTH_RESP);
}
buffer.append(": ");
buffer.append(scheme); // NTLM or Negotiate
buffer.append(" ");
buffer.append(response);
return new BufferedHeader(buffer);
}
private void failAuthCleanup() {
dispose();
this.continueNeeded = false;
}
// Per RFC4559, the Service Principal Name should HTTP/. However,
// can just be the host or the fully qualified name (e.g., see "Kerberos SPN generation"
// at http://www.chromium.org/developers/design-documents/http-authentication). Here,
// I've chosen to use the host that has been provided in HttpHost so that I don't incur
// any additional DNS lookup cost.
private String getServicePrincipalName(final HttpContext context) {
final String spn;
if (this.servicePrincipalName != null) {
spn = this.servicePrincipalName;
} else if(isProxy()){
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final RouteInfo route = clientContext.getHttpRoute();
if (route != null) {
spn = "HTTP/" + route.getProxyHost().getHostName();
} else {
// Should not happen
spn = null;
}
} else {
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final HttpHost target = clientContext.getTargetHost();
if (target != null) {
spn = "HTTP/" + target.getHostName();
} else {
final RouteInfo route = clientContext.getHttpRoute();
if (route != null) {
spn = "HTTP/" + route.getTargetHost().getHostName();
} else {
// Should not happen
spn = null;
}
}
}
if (this.log.isDebugEnabled()) {
this.log.debug("Using SPN: " + spn);
}
return spn;
}
// See http://msdn.microsoft.com/en-us/library/windows/desktop/aa375506(v=vs.85).aspx
String getToken(
final CtxtHandle continueCtx,
final SecBufferDesc continueToken,
final String targetName) {
final IntByReference attr = new IntByReference();
final SecBufferDesc token = new SecBufferDesc(
Sspi.SECBUFFER_TOKEN, Sspi.MAX_TOKEN_SIZE);
sspiContext = new CtxtHandle();
final int rc = Secur32.INSTANCE.InitializeSecurityContext(clientCred,
continueCtx, targetName, Sspi.ISC_REQ_DELEGATE | Sspi.ISC_REQ_MUTUAL_AUTH, 0,
Sspi.SECURITY_NATIVE_DREP, continueToken, 0, sspiContext, token,
attr, null);
switch (rc) {
case WinError.SEC_I_CONTINUE_NEEDED:
continueNeeded = true;
break;
case WinError.SEC_E_OK:
dispose(); // Don't keep the context
continueNeeded = false;
break;
default:
dispose();
throw new Win32Exception(rc);
}
return Base64.encodeBase64String(token.getBytes());
}
@Override
public boolean isComplete() {
return !continueNeeded;
}
@Override
@Deprecated
public Header authenticate(
final Credentials credentials,
final HttpRequest request) throws AuthenticationException {
return authenticate(credentials, request, null);
}
}