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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.message;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import javax.crypto.SecretKey;
import org.apache.wss4j.common.crypto.Crypto;
import org.apache.wss4j.common.crypto.CryptoType;
import org.apache.wss4j.common.derivedKey.AlgoFactory;
import org.apache.wss4j.common.derivedKey.ConversationConstants;
import org.apache.wss4j.common.derivedKey.DerivationAlgorithm;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.token.Reference;
import org.apache.wss4j.common.token.SecurityTokenReference;
import org.apache.wss4j.common.util.KeyUtils;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.dom.message.token.DerivedKeyToken;
import org.apache.wss4j.dom.message.token.KerberosSecurity;
import org.apache.wss4j.dom.util.WSSecurityUtil;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Base class for DerivedKey encryption and signature
*/
public abstract class WSSecDerivedKeyBase extends WSSecSignatureBase {
private static final org.slf4j.Logger LOG =
org.slf4j.LoggerFactory.getLogger(WSSecDerivedKeyBase.class);
/**
* DerivedKeyToken of this builder
*/
private DerivedKeyToken dkt;
/**
* Session key used as the secret in key derivation
*/
private byte[] ephemeralKey;
/**
* Client's label value
*/
private String clientLabel = ConversationConstants.DEFAULT_LABEL;
/**
* Service's label value
*/
private String serviceLabel = ConversationConstants.DEFAULT_LABEL;
/**
* The Token identifier of the token that the DerivedKeyToken
* is (or to be) derived from.
*/
private String tokenIdentifier;
/**
* True if the tokenIdentifier is a direct reference to a key identifier
* instead of a URI to a key
*/
private boolean tokenIdDirectId;
/**
* The wsse:SecurityTokenReference element to be used
*/
private Element strElem;
/**
* wsu:Id of the wsc:DerivedKeyToken
*/
private String dktId;
/**
* Raw bytes of the derived key
*/
private byte[] derivedKeyBytes;
private int wscVersion = ConversationConstants.DEFAULT_VERSION;
private String customValueType;
private X509Certificate useThisCert;
private Crypto crypto;
public WSSecDerivedKeyBase(WSSecHeader securityHeader) {
super(securityHeader);
setKeyIdentifierType(0);
}
public WSSecDerivedKeyBase(Document doc) {
super(doc);
setKeyIdentifierType(0);
}
/**
* The derived key will change depending on the sig/encr algorithm.
* Therefore the child classes are expected to provide this value.
* @return the derived key length
* @throws WSSecurityException
*/
protected abstract int getDerivedKeyLength() throws WSSecurityException;
/**
* @param ephemeralKey The ephemeralKey to set.
*/
public void setExternalKey(byte[] ephemeralKey, String tokenIdentifier) {
this.ephemeralKey = ephemeralKey;
this.tokenIdentifier = tokenIdentifier;
}
/**
* @param ephemeralKey The ephemeralKey to set.
*/
public void setExternalKey(byte[] ephemeralKey, Element strElem) {
this.ephemeralKey = ephemeralKey;
this.strElem = strElem;
}
/**
* @return Returns the tokenIdentifier.
*/
public String getTokenIdentifier() {
return tokenIdentifier;
}
/**
* Set the X509 Certificate to use
* @param cer the X509 Certificate to use
*/
public void setX509Certificate(X509Certificate cer) {
this.useThisCert = cer;
}
/**
* Get the id generated during prepare().
*
* Returns the the value of wsu:Id attribute of the DerivedKeyToken element.
*
* @return Return the wsu:Id of this token or null if prepare()
* was not called before.
*/
public String getId() {
return dktId;
}
/**
* Set the label value of the client.
* @param clientLabel
*/
public void setClientLabel(String clientLabel) {
this.clientLabel = clientLabel;
}
/**
* Set the label value of the service.
* @param serviceLabel
*/
public void setServiceLabel(String serviceLabel) {
this.serviceLabel = serviceLabel;
}
/**
* Initialize a WSSec Derived key.
*
* The method prepares and initializes a WSSec derived key structure after the
* relevant information was set. This method also creates and initializes the
* derived token using the ephemeral key. After preparation references
* can be added, encrypted and signed as required.
*
* This method does not add any element to the security header. This must be
* done explicitly.
*
* @throws WSSecurityException
*/
public void prepare() throws WSSecurityException {
// Create the derived keys
// At this point figure out the key length according to the symencAlgo
int offset = 0;
int length = getDerivedKeyLength();
byte[] label;
String labelText = clientLabel + serviceLabel;
label = labelText.getBytes(StandardCharsets.UTF_8);
byte[] nonce = WSSecurityUtil.generateNonce(16);
byte[] seed = new byte[label.length + nonce.length];
System.arraycopy(label, 0, seed, 0, label.length);
System.arraycopy(nonce, 0, seed, label.length, nonce.length);
DerivationAlgorithm algo =
AlgoFactory.getInstance(ConversationConstants.DerivationAlgorithm.P_SHA_1);
if (ephemeralKey == null || ephemeralKey.length == 0) {
LOG.debug("No ephemeral key is supplied for id: " + tokenIdentifier);
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE);
}
derivedKeyBytes = algo.createKey(ephemeralKey, seed, offset, length);
// Add the DKTs
dkt = new DerivedKeyToken(wscVersion, getDocument());
dktId = getIdAllocator().createId("DK-", dkt);
dkt.setOffset(offset);
dkt.setLength(length);
dkt.setNonce(XMLUtils.encodeToString(nonce));
dkt.setID(dktId);
if (strElem == null) {
SecurityTokenReference secRef = new SecurityTokenReference(getDocument());
String strUri = getIdAllocator().createSecureId("STR-", secRef);
secRef.setID(strUri);
X509Certificate[] certs = getSigningCerts();
switch (keyIdentifierType) {
case WSConstants.X509_KEY_IDENTIFIER:
secRef.setKeyIdentifier(certs[0]);
break;
case WSConstants.SKI_KEY_IDENTIFIER:
secRef.setKeyIdentifierSKI(certs[0], crypto);
break;
case WSConstants.THUMBPRINT_IDENTIFIER:
secRef.setKeyIdentifierThumb(certs[0]);
break;
case WSConstants.CUSTOM_KEY_IDENTIFIER:
secRef.setKeyIdentifier(customValueType, tokenIdentifier);
if (WSConstants.WSS_SAML_KI_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_SAML_TOKEN_TYPE);
} else if (WSConstants.WSS_SAML2_KI_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_SAML2_TOKEN_TYPE);
} else if (WSConstants.WSS_ENC_KEY_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_ENC_KEY_VALUE_TYPE);
}
break;
default:
Reference ref = new Reference(getDocument());
if (tokenIdDirectId) {
ref.setURI(tokenIdentifier);
} else {
ref.setURI("#" + tokenIdentifier);
}
if (customValueType != null && !"".equals(customValueType)) {
ref.setValueType(customValueType);
}
if (WSConstants.WSS_SAML_KI_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_SAML_TOKEN_TYPE);
ref.setValueType(customValueType);
} else if (WSConstants.WSS_SAML2_KI_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_SAML2_TOKEN_TYPE);
} else if (WSConstants.WSS_ENC_KEY_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_ENC_KEY_VALUE_TYPE);
ref.setValueType(customValueType);
} else if (KerberosSecurity.isKerberosToken(customValueType)) {
secRef.addTokenType(customValueType);
ref.setValueType(customValueType);
} else if (WSConstants.WSC_SCT.equals(customValueType)
|| WSConstants.WSC_SCT_05_12.equals(customValueType)) {
ref.setValueType(customValueType);
} else if (!WSConstants.WSS_USERNAME_TOKEN_VALUE_TYPE.equals(customValueType)) {
secRef.addTokenType(WSConstants.WSS_ENC_KEY_VALUE_TYPE);
}
secRef.setReference(ref);
}
dkt.setSecurityTokenReference(secRef);
} else {
dkt.setSecurityTokenReference(strElem);
}
}
/**
* Prepend the DerivedKey element to the elements already in the Security
* header.
*
* The method can be called any time after prepare(). This
* allows to insert the DerivedKey element at any position in the Security
* header.
*/
public void prependDKElementToHeader() {
Element securityHeaderElement = getSecurityHeader().getSecurityHeaderElement();
WSSecurityUtil.prependChildElement(securityHeaderElement, dkt.getElement());
}
public void appendDKElementToHeader() {
Element securityHeaderElement = getSecurityHeader().getSecurityHeaderElement();
securityHeaderElement.appendChild(dkt.getElement());
}
/**
* @param wscVersion The wscVersion to set.
*/
public void setWscVersion(int wscVersion) {
this.wscVersion = wscVersion;
}
public int getWscVersion() {
return wscVersion;
}
public Element getdktElement() {
return dkt.getElement();
}
public void setCustomValueType(String customValueType) {
this.customValueType = customValueType;
}
public void setTokenIdDirectId(boolean b) {
tokenIdDirectId = b;
}
/**
* Set up the X509 Certificate(s) for signing.
*/
private X509Certificate[] getSigningCerts() throws WSSecurityException {
X509Certificate[] certs = null;
if (keyIdentifierType == WSConstants.ISSUER_SERIAL
|| keyIdentifierType == WSConstants.X509_KEY_IDENTIFIER
|| keyIdentifierType == WSConstants.SKI_KEY_IDENTIFIER
|| keyIdentifierType == WSConstants.THUMBPRINT_IDENTIFIER) {
if (useThisCert == null) {
CryptoType cryptoType = new CryptoType(CryptoType.TYPE.ALIAS);
cryptoType.setAlias(user);
if (crypto == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILURE, "noSigCryptoFile");
}
certs = crypto.getX509Certificates(cryptoType);
} else {
certs = new X509Certificate[] {useThisCert};
}
if (certs == null || certs.length <= 0) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILURE,
"noUserCertsFound",
new Object[] {user, "signature"});
}
}
return certs;
}
public void setCrypto(Crypto crypto) {
this.crypto = crypto;
}
protected SecretKey getDerivedKey(String algorithm) {
return KeyUtils.prepareSecretKey(algorithm, derivedKeyBytes);
}
}
