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The Apache WSS4J project provides a Java implementation of the primary security standards
for Web Services, namely the OASIS Web Services Security (WS-Security) specifications
from the OASIS Web Services Security TC.
/*
* Copyright 2003-2004 The Apache Software Foundation.
*
* Licensed 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.ws.security.message.token;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSDocInfo;
import org.apache.ws.security.WSPasswordCallback;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.ws.security.util.DOM2Writer;
import org.apache.ws.security.util.WSSecurityUtil;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.content.x509.XMLX509IssuerSerial;
import org.apache.xml.security.keys.content.X509Data;
import org.apache.ws.security.util.Base64;
import org.apache.xml.security.utils.Constants;
import org.w3c.dom.*;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
/**
* Security Token Reference.
*
* @author Davanum Srinivas ([email protected]).
*/
public class SecurityTokenReference {
private static Log log =
LogFactory.getLog(SecurityTokenReference.class.getName());
public static final String SECURITY_TOKEN_REFERENCE = "SecurityTokenReference";
public static final String KEY_NAME = "KeyName";
public static final String SKI_URI =
WSConstants.X509TOKEN_NS + "#X509SubjectKeyIdentifier";
public static final String THUMB_URI =
WSConstants.SOAPMESSAGE_NS11 + "#" + WSConstants.THUMBPRINT;
public static final String SAML_ID_URI =
WSConstants.SAMLTOKEN_NS + "#" + WSConstants.SAML_ASSERTION_ID;
public static final String ENC_KEY_SHA1_URI =
WSConstants.SOAPMESSAGE_NS11 + "#" + WSConstants.ENC_KEY_SHA1_URI;
protected Element element = null;
private XMLX509IssuerSerial issuerSerial = null;
private byte[] skiBytes = null;
private static boolean doDebug = false;
/**
* Constructor.
*
* @param elem TODO
* @throws WSSecurityException
*/
public SecurityTokenReference(Element elem) throws WSSecurityException {
doDebug = log.isDebugEnabled();
this.element = elem;
boolean goodElement = false;
if (SECURITY_TOKEN_REFERENCE.equals(element.getLocalName())) {
goodElement = WSConstants.WSSE_NS.equals(element.getNamespaceURI());
// } else if (KEY_NAME.equals(element.getLocalName())) {
// goodElement = WSConstants.SIG_NS.equals(element.getNamespaceURI());
}
if (!goodElement) {
throw new WSSecurityException(WSSecurityException.FAILURE, "badElement", null);
}
}
/**
* Constructor.
*
* @param doc TODO
*/
public SecurityTokenReference(Document doc) {
doDebug = log.isDebugEnabled();
this.element =
doc.createElementNS(WSConstants.WSSE_NS, "wsse:SecurityTokenReference");
WSSecurityUtil.setNamespace(this.element, WSConstants.WSSE_NS, WSConstants.WSSE_PREFIX);
}
/**
* set the reference.
*
* @param ref
*/
public void setReference(Reference ref) {
Element elem = getFirstElement();
if (elem != null) {
this.element.replaceChild(ref.getElement(), elem);
} else {
this.element.appendChild(ref.getElement());
}
}
/**
* Gets the Reference.
*
* @return the Reference element contained in this
* SecurityTokenReference
* @throws WSSecurityException
*/
public Reference getReference() throws WSSecurityException {
Element elem = getFirstElement();
return new Reference(elem);
}
/**
* Gets the signing token element, which maybe a BinarySecurityToken
* or a SAML token.
*
* The method gets the URI attribute of the {@link Reference} contained in
* the {@link SecurityTokenReference} and tries to find the referenced
* Element in the document.
*
* @param doc the document that contains the binary security token
* element. This could be different from the document
* that contains the SecurityTokenReference (STR). See
* STRTransform.derefenceBST() method
* @return Element containing the signing token, must be a BinarySecurityToken
* @throws WSSecurityException When either no Reference element, or the found
* reference contains no URI, or the referenced signing not found.
*/
public Element getTokenElement(Document doc, WSDocInfo docInfo, CallbackHandler cb)
throws WSSecurityException {
Reference ref = getReference();
String uri = ref.getURI();
if (doDebug) {
log.debug("Token reference uri: " + uri);
}
if (uri == null) {
throw new WSSecurityException(
WSSecurityException.INVALID_SECURITY, "badReferenceURI"
);
}
Element tokElement = findTokenElement(doc, docInfo, cb, uri, ref.getValueType());
if (tokElement == null) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE,
"noToken",
new Object[]{uri}
);
}
return tokElement;
}
/**
* Gets the signing token element, which may be a BinarySecurityToken
* or a SAML token.
*
* The method gets the value of the KeyIdentifier contained in
* the {@link SecurityTokenReference} and tries to find the referenced
* Element in the document.
*
* @param doc the document that contains the binary security token
* element. This could be different from the document
* that contains the SecurityTokenReference (STR). See
* STRTransform.derefenceBST() method
* @return Element containing the signing token
*/
public Element getKeyIdentifierTokenElement(
Document doc, WSDocInfo docInfo, CallbackHandler cb
) throws WSSecurityException {
String value = getKeyIdentifierValue();
String type = getKeyIdentifierValueType();
if (doDebug) {
log.debug("Token reference uri: " + value);
}
if (value == null) {
throw new WSSecurityException(
WSSecurityException.INVALID_SECURITY, "badReferenceURI"
);
}
Element tokElement = findTokenElement(doc, docInfo, cb, value, type);
if (tokElement == null) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE,
"noToken",
new Object[]{value}
);
}
return tokElement;
}
private Element findTokenElement(
Document doc,
WSDocInfo docInfo,
CallbackHandler cb,
String uri,
String type
) {
Element tokElement = null;
String id = uri;
if (id.charAt(0) == '#') {
id = id.substring(1);
}
//
// If the type is a SAMLAssertionID then find the SAML assertion - first check
// if it has been previously processed, else search the header for it
//
String assertionStr = WSConstants.WSS_SAML_NS + WSConstants.ASSERTION_LN;
if (WSConstants.WSS_SAML_KI_VALUE_TYPE.equals(type)
|| assertionStr.equals(type)) {
Element sa = docInfo.getAssertion();
if (sa != null) {
String saID = sa.getAttribute("AssertionID");
if (doDebug) {
log.debug("SAML token ID: " + saID);
}
if (saID.equals(id)) {
tokElement = sa;
}
}
if (tokElement == null) {
Node assertion =
WSSecurityUtil.findSAMLAssertionElementById(
doc.getDocumentElement(),
id
);
if (assertion != null) {
tokElement = (Element)assertion;
}
}
}
//
// Try to find a custom token
//
if (tokElement == null && WSConstants.WSC_SCT.equals(type) && cb != null) {
//try to find a custom token
WSPasswordCallback pwcb =
new WSPasswordCallback(id, WSPasswordCallback.CUSTOM_TOKEN);
try {
cb.handle(new Callback[]{pwcb});
Element assertionElem = pwcb.getCustomToken();
if (assertionElem != null) {
tokElement = (Element)doc.importNode(assertionElem, true);
}
} catch (Exception e) {
log.debug(e.getMessage(), e);
// Consume this failure
}
}
//
// Finally try to find the element by its Id
//
if (tokElement == null) {
tokElement = WSSecurityUtil.getElementByWsuId(doc, uri);
// In some scenarios id is used rather than wsu:Id
if (tokElement == null) {
tokElement = WSSecurityUtil.getElementByGenId(doc, uri);
}
}
return tokElement;
}
/**
* Sets the KeyIdentifier Element as a X509 certificate.
* Takes a X509 certificate, converts its data into base 64 and inserts
* it into a wsse:KeyIdentifier element, which is placed
* in the wsse:SecurityTokenReference element.
*
* @param cert is the X509 certificate to be inserted as key identifier
*/
public void setKeyIdentifier(X509Certificate cert)
throws WSSecurityException {
Document doc = this.element.getOwnerDocument();
byte data[] = null;
try {
data = cert.getEncoded();
} catch (CertificateEncodingException e) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE, "encodeError", null, e
);
}
Text text = doc.createTextNode(Base64.encode(data));
createKeyIdentifier(doc, X509Security.X509_V3_TYPE, text, true);
}
/**
* Sets the KeyIdentifier Element as a X509 Subject-Key-Identifier (SKI).
* Takes a X509 certificate, gets it SKI data, converts into base 64 and
* inserts it into a wsse:KeyIdentifier element, which is placed
* in the wsse:SecurityTokenReference element.
*
* @param cert is the X509 certificate to get the SKI
* @param crypto is the Crypto implementation. Used to read SKI info bytes from certificate
*/
public void setKeyIdentifierSKI(X509Certificate cert, Crypto crypto)
throws WSSecurityException {
//
// As per the 1.1 specification, SKI can only be used for a V3 certificate
//
if (cert.getVersion() != 3) {
throw new WSSecurityException(
WSSecurityException.UNSUPPORTED_SECURITY_TOKEN,
"invalidCertForSKI",
new Object[]{new Integer(cert.getVersion())}
);
}
Document doc = this.element.getOwnerDocument();
byte data[] = crypto.getSKIBytesFromCert(cert);
org.w3c.dom.Text text = doc.createTextNode(Base64.encode(data));
createKeyIdentifier(doc, SKI_URI, text, true);
}
/**
* Sets the KeyIdentifier Element as a Thumbprint.
*
* Takes a X509 certificate, computes its thumbprint using SHA-1, converts
* into base 64 and inserts it into a wsse:KeyIdentifier
* element, which is placed in the wsse:SecurityTokenReference
* element.
*
* @param cert is the X509 certificate to get the thumbprint
*/
public void setKeyIdentifierThumb(X509Certificate cert) throws WSSecurityException {
Document doc = this.element.getOwnerDocument();
MessageDigest sha = null;
try {
sha = MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException e1) {
throw new WSSecurityException(
WSSecurityException.FAILURE, "noSHA1availabe", null, e1
);
}
sha.reset();
try {
sha.update(cert.getEncoded());
} catch (CertificateEncodingException e1) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE, "encodeError", null, e1
);
}
byte[] data = sha.digest();
org.w3c.dom.Text text = doc.createTextNode(Base64.encode(data));
createKeyIdentifier(doc, THUMB_URI, text, true);
}
public void setKeyIdentifierEncKeySHA1(String value) throws WSSecurityException {
Document doc = this.element.getOwnerDocument();
org.w3c.dom.Text text = doc.createTextNode(value);
createKeyIdentifier(doc, ENC_KEY_SHA1_URI, text, true);
}
public void setSAMLKeyIdentifier(String keyIdVal) throws WSSecurityException {
Document doc = this.element.getOwnerDocument();
createKeyIdentifier(doc, SAML_ID_URI, doc.createTextNode(keyIdVal), false);
}
public void setKeyIdentifier(String valueType, String keyIdVal) throws WSSecurityException {
Document doc = this.element.getOwnerDocument();
createKeyIdentifier(doc, valueType, doc.createTextNode(keyIdVal), false);
}
private void createKeyIdentifier(Document doc, String uri, Node node, boolean base64) {
Element keyId = doc.createElementNS(WSConstants.WSSE_NS, "wsse:KeyIdentifier");
keyId.setAttributeNS(null, "ValueType", uri);
if (base64) {
keyId.setAttributeNS(null, "EncodingType", BinarySecurity.BASE64_ENCODING);
}
keyId.appendChild(node);
Element elem = getFirstElement();
if (elem != null) {
this.element.replaceChild(keyId, elem);
} else {
this.element.appendChild(keyId);
}
}
/**
* get the first child element.
*
* @return the first Element child node
*/
public Element getFirstElement() {
for (Node currentChild = this.element.getFirstChild();
currentChild != null;
currentChild = currentChild.getNextSibling()
) {
if (currentChild instanceof Element) {
return (Element) currentChild;
}
}
return null;
}
/**
* Gets the KeyIdentifier.
*
* @return the the X509 certificate or zero if a unknown key identifier
* type was detected.
*/
public X509Certificate[] getKeyIdentifier(Crypto crypto) throws WSSecurityException {
Element elem = getFirstElement();
String value = elem.getAttribute("ValueType");
String alias = null;
if (X509Security.X509_V3_TYPE.equals(value)) {
X509Security token = new X509Security(elem);
if (token != null) {
X509Certificate cert = token.getX509Certificate(crypto);
X509Certificate[] certs = new X509Certificate[1];
certs[0] = cert;
return certs;
}
} else if (SKI_URI.equals(value)) {
alias = getX509SKIAlias(crypto);
} else if (THUMB_URI.equals(value)) {
Node node = getFirstElement().getFirstChild();
if (node == null) {
return null;
}
if (node.getNodeType() == Node.TEXT_NODE) {
byte[] thumb = Base64.decode(((Text) node).getData());
alias = crypto.getAliasForX509CertThumb(thumb);
}
}
if (alias != null) {
return crypto.getCertificates(alias);
}
return null;
}
public String getKeyIdentifierValue() {
if (containsKeyIdentifier()) {
Node node = getFirstElement().getFirstChild();
if (node == null) {
return null;
}
if (node.getNodeType() == Node.TEXT_NODE) {
return ((Text) node).getData();
}
}
return null;
}
public String getKeyIdentifierValueType() {
if (containsKeyIdentifier()) {
Element elem = getFirstElement();
return elem.getAttribute("ValueType");
}
return null;
}
public String getX509SKIAlias(Crypto crypto) throws WSSecurityException {
if (skiBytes == null) {
skiBytes = getSKIBytes();
if (skiBytes == null) {
return null;
}
}
String alias = crypto.getAliasForX509Cert(skiBytes);
if (doDebug) {
log.info("X509 SKI alias: " + alias);
}
return alias;
}
public byte[] getSKIBytes() {
if (skiBytes != null) {
return skiBytes;
}
Node node = getFirstElement().getFirstChild();
if (node == null) {
return null;
}
if (node.getNodeType() == Node.TEXT_NODE) {
try {
skiBytes = Base64.decode(((Text) node).getData());
} catch (WSSecurityException e) {
return null;
}
}
return skiBytes;
}
/**
* Sets the X509 IssuerSerial data.
*
* @param ref the {@link XMLX509IssuerSerial} to put into this
* SecurityTokenReference
*/
public void setX509IssuerSerial(X509Data ref) {
Element elem = getFirstElement();
if (elem != null) {
this.element.replaceChild(ref.getElement(), elem);
} else {
this.element.appendChild(ref.getElement());
}
}
/**
* Gets the certificate identified with X509 issuerSerial data.
* This method first tries to get the embedded certificate.
* If this fails it checks if the certificate is in the
* keystore.
*
* @return a certificate array or null if nothing found
*/
public X509Certificate[] getX509IssuerSerial(Crypto crypto) throws WSSecurityException {
String alias = getX509IssuerSerialAlias(crypto);
if (alias != null) {
return crypto.getCertificates(alias);
}
return null;
}
/**
* Gets the alias name of the certificate identified with X509 issuerSerial data.
* The keystore identifies the certificate and the key with this alias name.
*
* @return the alias name for the certificate or null if nothing found
*/
public String getX509IssuerSerialAlias(Crypto crypto) throws WSSecurityException {
if (issuerSerial == null) {
issuerSerial = getIssuerSerial();
if (issuerSerial == null) {
return null;
}
}
String alias =
crypto.getAliasForX509Cert(issuerSerial.getIssuerName(), issuerSerial.getSerialNumber());
if (doDebug) {
log.info("X509IssuerSerial alias: " + alias);
}
return alias;
}
private XMLX509IssuerSerial getIssuerSerial() throws WSSecurityException {
if (issuerSerial != null) {
return issuerSerial;
}
Element elem = getFirstElement();
if (elem == null) {
return null;
}
try {
if (Constants._TAG_X509DATA.equals(elem.getLocalName())) {
elem =
(Element)WSSecurityUtil.findElement(
elem, Constants._TAG_X509ISSUERSERIAL, Constants.SignatureSpecNS
);
}
issuerSerial = new XMLX509IssuerSerial(elem, "");
} catch (XMLSecurityException e) {
throw new WSSecurityException(
WSSecurityException.SECURITY_TOKEN_UNAVAILABLE,
"noToken",
new Object[]{"Issuer/Serial data element missing"},
e
);
}
return issuerSerial;
}
/**
* Method containsReference
*
* @return true if the SecurtityTokenReference contains
* a wsse:Reference element
*/
public boolean containsReference() {
return this.lengthReference() > 0;
}
/**
* Method lengthReference.
*
* @return number of wsse:Reference elements in
* the SecurtityTokenReference
*/
public int lengthReference() {
return this.length(WSConstants.WSSE_NS, "Reference");
}
/**
* Method containsX509IssuerSerial
*
* @return true if the SecurtityTokenReference contains
* a ds:IssuerSerial element
*/
public boolean containsX509IssuerSerial() {
return this.lengthX509IssuerSerial() > 0;
}
/**
* Method containsX509Data
*
* @return true if the SecurtityTokenReference contains
* a ds:X509Data element
*/
public boolean containsX509Data() {
return this.lengthX509Data() > 0;
}
/**
* Method lengthX509IssuerSerial.
*
* @return number of ds:IssuerSerial elements in
* the SecurtityTokenReference
*/
public int lengthX509IssuerSerial() {
return this.length(WSConstants.SIG_NS, Constants._TAG_X509ISSUERSERIAL);
}
/**
* Method lengthX509Data.
*
* @return number of ds:IssuerSerial elements in
* the SecurtityTokenReference
*/
public int lengthX509Data() {
return this.length(WSConstants.SIG_NS, Constants._TAG_X509DATA);
}
/**
* Method containsKeyIdentifier.
*
* @return true if the SecurtityTokenReference contains
* a wsse:KeyIdentifier element
*/
public boolean containsKeyIdentifier() {
return this.lengthKeyIdentifier() > 0;
}
/**
* Method lengthKeyIdentifier.
*
* @return number of wsse:KeyIdentifier elements in
* the SecurtityTokenReference
*/
public int lengthKeyIdentifier() {
return this.length(WSConstants.WSSE_NS, "KeyIdentifier");
}
/**
* Method length.
*
* @param namespace
* @param localname
* @return number of elements with matching localname and namespace
*/
public int length(String namespace, String localname) {
NodeList childNodes = this.element.getChildNodes();
int result = 0;
for (int i = 0; i < childNodes.getLength(); i++) {
Node n = childNodes.item(i);
if (n.getNodeType() == Node.ELEMENT_NODE) {
String ns = n.getNamespaceURI();
String name = n.getLocalName();
if ((((namespace != null) && namespace.equals(ns))
|| ((namespace == null) && (ns == null)))
&& (localname.equals(name))
) {
result++;
}
}
}
return result;
}
/**
* get the dom element.
*
* @return TODO
*/
public Element getElement() {
return this.element;
}
/**
* set the id.
*
* @param id
*/
public void setID(String id) {
String prefix =
WSSecurityUtil.setNamespace(
this.element, WSConstants.WSU_NS, WSConstants.WSU_PREFIX
);
this.element.setAttributeNS(WSConstants.WSU_NS, prefix + ":Id", id);
}
/**
* return the string representation.
*
* @return TODO
*/
public String toString() {
return DOM2Writer.nodeToString((Node) this.element);
}
}