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/**
* 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.
*/
package org.apache.wss4j.dom.validate;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.UnsupportedCallbackException;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.common.ext.WSPasswordCallback;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.util.UsernameTokenUtil;
import org.apache.wss4j.dom.handler.RequestData;
import org.apache.wss4j.dom.message.token.UsernameToken;
import org.apache.xml.security.utils.XMLUtils;
/**
* This class validates a processed UsernameToken, extracted from the Credential passed to
* the validate method.
*/
public class UsernameTokenValidator implements Validator {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(UsernameTokenValidator.class);
/**
* Validate the credential argument. It must contain a non-null UsernameToken. A
* CallbackHandler implementation is also required to be set.
*
* If the password type is either digest or plaintext, it extracts a password from the
* CallbackHandler and then compares the passwords appropriately.
*
* If the password is null it queries a hook to allow the user to validate UsernameTokens
* of this type.
*
* @param credential the Credential to be validated
* @param data the RequestData associated with the request
* @throws WSSecurityException on a failed validation
*/
public Credential validate(Credential credential, RequestData data) throws WSSecurityException {
if (credential == null || credential.getUsernametoken() == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "noCredential");
}
boolean handleCustomPasswordTypes = data.isHandleCustomPasswordTypes();
boolean passwordsAreEncoded = data.isEncodePasswords();
String requiredPasswordType = data.getRequiredPasswordType();
UsernameToken usernameToken = credential.getUsernametoken();
usernameToken.setPasswordsAreEncoded(passwordsAreEncoded);
String pwType = usernameToken.getPasswordType();
LOG.debug("UsernameToken user {}", usernameToken.getName());
LOG.debug("UsernameToken password type {}", pwType);
if (requiredPasswordType != null && !requiredPasswordType.equals(pwType)) {
LOG.warn("Authentication failed as the received password type does not "
+ "match the required password type of: {}", requiredPasswordType);
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
//
// If the UsernameToken is hashed or plaintext, then retrieve the password from the
// callback handler and compare directly. If the UsernameToken is of some unknown type,
// then delegate authentication to the callback handler
//
String password = usernameToken.getPassword();
if (usernameToken.isHashed()) {
verifyDigestPassword(usernameToken, data);
} else if (WSConstants.PASSWORD_TEXT.equals(pwType)
|| password != null && (pwType == null || pwType.trim().length() == 0)) {
verifyPlaintextPassword(usernameToken, data);
} else if (password != null) {
if (!handleCustomPasswordTypes) {
LOG.warn("Authentication failed as handleCustomUsernameTokenTypes is false");
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
verifyCustomPassword(usernameToken, data);
} else {
verifyUnknownPassword(usernameToken, data);
}
return credential;
}
/**
* Verify a UsernameToken containing a password of some unknown (but specified) password
* type. It does this by querying a CallbackHandler instance to obtain a password for the
* given username, and then comparing it against the received password.
* This method currently uses the same logic as the verifyPlaintextPassword case, but it in
* a separate protected method to allow users to override the validation of the custom
* password type specific case.
* @param usernameToken The UsernameToken instance to verify
* @throws WSSecurityException on a failed authentication.
*/
protected void verifyCustomPassword(UsernameToken usernameToken,
RequestData data) throws WSSecurityException {
verifyPlaintextPassword(usernameToken, data);
}
/**
* Verify a UsernameToken containing a plaintext password. It does this by querying a
* CallbackHandler instance to obtain a password for the given username, and then comparing
* it against the received password.
* This method currently uses the same logic as the verifyDigestPassword case, but it in
* a separate protected method to allow users to override the validation of the plaintext
* password specific case.
* @param usernameToken The UsernameToken instance to verify
* @throws WSSecurityException on a failed authentication.
*/
protected void verifyPlaintextPassword(UsernameToken usernameToken,
RequestData data) throws WSSecurityException {
verifyDigestPassword(usernameToken, data);
}
/**
* Verify a UsernameToken containing a password digest. It does this by querying a
* CallbackHandler instance to obtain a password for the given username, and then comparing
* it against the received password.
* @param usernameToken The UsernameToken instance to verify
* @throws WSSecurityException on a failed authentication.
*/
protected void verifyDigestPassword(UsernameToken usernameToken,
RequestData data) throws WSSecurityException {
if (data.getCallbackHandler() == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "noCallback");
}
String user = usernameToken.getName();
String password = usernameToken.getPassword();
String nonce = usernameToken.getNonce();
String createdTime = usernameToken.getCreated();
String pwType = usernameToken.getPasswordType();
boolean passwordsAreEncoded = usernameToken.getPasswordsAreEncoded();
WSPasswordCallback pwCb =
new WSPasswordCallback(user, null, pwType, WSPasswordCallback.USERNAME_TOKEN);
try {
data.getCallbackHandler().handle(new Callback[]{pwCb});
} catch (IOException | UnsupportedCallbackException e) {
LOG.debug(e.getMessage(), e);
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILED_AUTHENTICATION, e
);
}
String origPassword = pwCb.getPassword();
if (origPassword == null) {
LOG.warn("Callback supplied no password for: {}", user);
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
if (usernameToken.isHashed()) {
byte[] decodedNonce = XMLUtils.decode(nonce);
byte[] decodedPassword = XMLUtils.decode(password);
byte[] passDigest;
if (passwordsAreEncoded) {
passDigest = UsernameTokenUtil.doRawPasswordDigest(decodedNonce, createdTime,
XMLUtils.decode(origPassword));
} else {
passDigest = UsernameTokenUtil.doRawPasswordDigest(decodedNonce, createdTime,
origPassword.getBytes(StandardCharsets.UTF_8));
}
if (!MessageDigest.isEqual(decodedPassword, passDigest)) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
} else {
byte[] origPasswordBytes = origPassword.getBytes(StandardCharsets.UTF_8);
byte[] passwordBytes = password.getBytes(StandardCharsets.UTF_8);
if (!MessageDigest.isEqual(origPasswordBytes, passwordBytes)) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
}
}
/**
* Verify a UsernameToken containing no password. An exception is thrown unless the user
* has explicitly allowed this use-case via WSHandlerConstants.ALLOW_USERNAMETOKEN_NOPASSWORD
* @param usernameToken The UsernameToken instance to verify
* @throws WSSecurityException on a failed authentication.
*/
protected void verifyUnknownPassword(UsernameToken usernameToken,
RequestData data) throws WSSecurityException {
boolean allowUsernameTokenDerivedKeys = data.isAllowUsernameTokenNoPassword();
if (!allowUsernameTokenDerivedKeys) {
LOG.warn("Authentication failed as the received UsernameToken does not "
+ "contain any password element");
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_AUTHENTICATION);
}
}
}
