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package org.apache.catalina.authenticator;
import org.apache.catalina.HttpRequest;
import org.apache.catalina.HttpResponse;
import org.apache.catalina.deploy.LoginConfig;
import org.apache.catalina.util.DigestEncoder;
import org.apache.catalina.LifecycleException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Principal;
import java.util.Map;
import java.util.StringTokenizer;
/**
* An Authenticator and Valve implementation of HTTP DIGEST
* Authentication (see RFC 2069).
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @version $Revision: 1.6 $ $Date: 2007/04/17 21:33:22 $
*/
public class DigestAuthenticator
extends AuthenticatorBase {
// -------------------------------------------------------------- Constants
/**
* The MD5 helper object for this class.
*/
protected static final DigestEncoder digestEncoder = new DigestEncoder();
/**
* Descriptive information about this implementation.
*/
protected static final String info =
"org.apache.catalina.authenticator.DigestAuthenticator/1.0";
/**
* DIGEST implementation only supports auth quality of protection.
*/
protected static final String QOP = "auth";
/**
* The default message digest algorithm to use if we cannot use
* the requested one.
*/
protected static final String DEFAULT_ALGORITHM = "MD5";
private static final String EMPTY_STRING = "";
// ----------------------------------------------------------- Constructors
public DigestAuthenticator() {
super();
}
// ----------------------------------------------------- Static Variables
/**
* The message digest algorithm to be used when generating session
* identifiers. This must be an algorithm supported by the
* java.security.MessageDigest class on your platform.
*/
protected static volatile String algorithm = DEFAULT_ALGORITHM;
/**
* MD5 message digest provider.
*/
protected volatile static MessageDigest messageDigest;
// ----------------------------------------------------- Instance Variables
/**
* List of client nonce values currently being tracked
protected Map cnonces;
*/
/**
* Maximum number of client nonces to keep in the cache. If not specified,
* the default value of 1000 is used.
*/
protected int cnonceCacheSize = 1000;
/**
* Private key.
*/
protected String key = null;
/**
* How long server nonces are valid for in milliseconds. Defaults to 5
* minutes.
*/
protected long nonceValidity = 5 * 60 * 1000;
/**
* Opaque string.
*/
protected String opaque;
/**
* Should the URI be validated as required by RFC2617? Can be disabled in
* reverse proxies where the proxy has modified the URI.
*/
protected boolean validateUri = true;
// ------------------------------------------------------------- Properties
/**
* Return the message digest algorithm for this Manager.
*/
public static String getAlgorithm() {
return algorithm;
}
/**
* Set the message digest algorithm for this Manager.
*
* @param alg The new message digest algorithm
*/
public static synchronized void setAlgorithm(String alg) {
algorithm = alg;
// reset the messageDigest
messageDigest = null;
}
/**
* Return descriptive information about this Valve implementation.
*/
@Override
public String getInfo() {
return (info);
}
public int getCnonceCacheSize() {
return cnonceCacheSize;
}
public void setCnonceCacheSize(int cnonceCacheSize) {
this.cnonceCacheSize = cnonceCacheSize;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public long getNonceValidity() {
return nonceValidity;
}
public void setNonceValidity(long nonceValidity) {
this.nonceValidity = nonceValidity;
}
public String getOpaque() {
return opaque;
}
public void setOpaque(String opaque) {
this.opaque = opaque;
}
public boolean isValidateUri() {
return validateUri;
}
public void setValidateUri(boolean validateUri) {
this.validateUri = validateUri;
}
// --------------------------------------------------------- Public Methods
/**
* Authenticate the user making this request, based on the specified
* login configuration. Return true if any specified
* constraint has been satisfied, or false if we have
* created a response challenge already.
*
* @param request Request we are processing
* @param response Response we are creating
* @param config Login configuration describing how authentication
* should be performed
*
* @exception IOException if an input/output error occurs
*/
@Override
public boolean authenticate(HttpRequest request,
HttpResponse response,
LoginConfig config)
throws IOException {
// Have we already authenticated someone?
Principal principal =
((HttpServletRequest) request.getRequest()).getUserPrincipal();
if (principal != null)
return (true);
// Validate any credentials already included with this request
HttpServletRequest hreq =
(HttpServletRequest) request.getRequest();
HttpServletResponse hres =
(HttpServletResponse) response.getResponse();
String authorization = request.getAuthorization();
DigestInfo digestInfo = new DigestInfo(getOpaque(), getNonceValidity(),
getKey(), /*cnonces,*/ isValidateUri());
if (authorization != null) {
boolean validRequest = digestInfo.validate(hreq, authorization, config);
if (validRequest) {
principal = context.getRealm().authenticate(hreq);
if (principal != null) {
String username = parseUsername(authorization);
register(request, response, principal,
Constants.DIGEST_METHOD,
username, null);
String ssoId = (String) request.getNote(
Constants.REQ_SSOID_NOTE);
if (ssoId != null) {
getSession(request, true);
}
return (true);
}
}
}
// Send an "unauthorized" response and an appropriate challenge
// Next, generate a nOnce token (that is a token which is supposed
// to be unique).
String nonce = generateNonce(hreq);
setAuthenticateHeader(hreq, hres, config, nonce,
digestInfo.isNonceStale());
hres.sendError(HttpServletResponse.SC_UNAUTHORIZED);
// hres.flushBuffer();
return (false);
}
// ------------------------------------------------------ Protected Methods
/**
* Parse the username from the specified authorization string. If none
* can be identified, return null
*
* @param authorization Authorization string to be parsed
*/
protected String parseUsername(String authorization) {
//System.out.println("Authorization token : " + authorization);
// Validate the authorization credentials format
if (authorization == null)
return (null);
if (!authorization.startsWith("Digest "))
return (null);
authorization = authorization.substring(7).trim();
StringTokenizer commaTokenizer =
new StringTokenizer(authorization, ",");
while (commaTokenizer.hasMoreTokens()) {
String currentToken = commaTokenizer.nextToken();
int equalSign = currentToken.indexOf('=');
if (equalSign < 0)
return null;
String currentTokenName =
currentToken.substring(0, equalSign).trim();
String currentTokenValue =
currentToken.substring(equalSign + 1).trim();
if ("username".equals(currentTokenName))
return (removeQuotes(currentTokenValue));
}
return (null);
}
@Override
protected String getAuthMethod() {
return HttpServletRequest.DIGEST_AUTH;
}
/**
* Removes the quotes on a string.
*/
protected static String removeQuotes(String quotedString,
boolean quotesRequired) {
//support both quoted and non-quoted
if (quotedString.length() > 0 && quotedString.charAt(0) != '"' &&
!quotesRequired) {
return quotedString;
} else if (quotedString.length() > 2) {
return quotedString.substring(1, quotedString.length() - 1);
} else {
return EMPTY_STRING;
}
}
/**
* Removes the quotes on a string.
*/
protected static String removeQuotes(String quotedString) {
return removeQuotes(quotedString, false);
}
/**
* Generate a unique token. The token is generated according to the
* following pattern. NOnceToken = Base64 ( MD5 ( client-IP ":"
* time-stamp ":" private-key ) ).
*
* @param request HTTP Servlet request
*/
protected String generateNonce(HttpServletRequest request) {
long currentTime = System.currentTimeMillis();
String ipTimeKey =
request.getRemoteAddr() + ":" + currentTime + ":" + getKey();
byte[] buffer = digest(ipTimeKey.getBytes(Charset.defaultCharset()));
return currentTime + ":" + new String (digestEncoder.encode(buffer));
}
/**
* Generates the WWW-Authenticate header.
*
* The header MUST follow this template :
*
* WWW-Authenticate = "WWW-Authenticate" ":" "Digest"
* digest-challenge
*
* digest-challenge = 1#( realm | [ domain ] | nOnce |
* [ digest-opaque ] |[ stale ] | [ algorithm ] )
*
* realm = "realm" "=" realm-value
* realm-value = quoted-string
* domain = "domain" "=" <"> 1#URI <">
* nonce = "nonce" "=" nonce-value
* nonce-value = quoted-string
* opaque = "opaque" "=" quoted-string
* stale = "stale" "=" ( "true" | "false" )
* algorithm = "algorithm" "=" ( "MD5" | token )
*
*
* @param request HTTP Servlet request
* @param response HTTP Servlet response
* @param config Login configuration describing how authentication
* should be performed
* @param nOnce nonce token
*/
protected void setAuthenticateHeader(HttpServletRequest request,
HttpServletResponse response,
LoginConfig config,
String nOnce,
boolean isNonceStale) {
// Get the realm name
String realmName = config.getRealmName();
if (realmName == null)
realmName = REALM_NAME;
String authenticateHeader;
if (isNonceStale) {
authenticateHeader = "Digest realm=\"" + realmName + "\", " +
"qop=\"" + QOP + "\", nonce=\"" + nOnce + "\", " + "opaque=\"" +
getOpaque() + "\", stale=true";
} else {
authenticateHeader = "Digest realm=\"" + realmName + "\", " +
"qop=\"" + QOP + "\", nonce=\"" + nOnce + "\", " + "opaque=\"" +
getOpaque() + "\"";
}
response.setHeader(AUTH_HEADER_NAME, authenticateHeader);
}
protected static synchronized MessageDigest getMessageDigest() {
if (messageDigest == null) {
try {
messageDigest = MessageDigest.getInstance(algorithm);
} catch(NoSuchAlgorithmException e) {
throw new IllegalStateException(
algorithm + " digest algorithm not available", e);
}
}
return messageDigest;
}
protected static byte[] digest(byte[] data) {
byte[] buffer = null;
MessageDigest md = getMessageDigest();
synchronized(md) {
buffer = md.digest(data);
}
return buffer;
}
// ------------------------------------------------------- Lifecycle Methods
@Override
public synchronized void start() throws LifecycleException {
super.start();
// Generate a random secret key
if (getKey() == null) {
setKey(generateSessionId());
}
// Generate the opaque string the same way
if (getOpaque() == null) {
setOpaque(generateSessionId());
}
}
private static class DigestInfo {
private String opaque;
private long nonceValidity;
private String key;
private boolean validateUri = true;
private String userName = null;
private String uri = null;
private String response = null;
private String nonce = null;
private String nc = null;
private String cnonce = null;
private String realmName = null;
private String qop = null;
private boolean nonceStale = false;
public DigestInfo(String opaque, long nonceValidity, String key,
boolean validateUri) {
this.opaque = opaque;
this.nonceValidity = nonceValidity;
this.key = key;
this.validateUri = validateUri;
}
public boolean validate(HttpServletRequest request, String authorization,
LoginConfig config) {
// Validate the authorization credentials format
if (authorization == null) {
return false;
}
if (!authorization.startsWith("Digest ")) {
return false;
}
authorization = authorization.substring(7).trim();
// Bugzilla 37132: http://issues.apache.org/bugzilla/show_bug.cgi?id=37132
String[] tokens = authorization.split(",(?=(?:[^\"]*\"[^\"]*\")+$)");
String opaque_client = null;
for (int i = 0; i < tokens.length; i++) {
String currentToken = tokens[i];
if (currentToken.length() == 0)
continue;
int equalSign = currentToken.indexOf('=');
if (equalSign < 0) {
return false;
}
String currentTokenName =
currentToken.substring(0, equalSign).trim();
String currentTokenValue =
currentToken.substring(equalSign + 1).trim();
if ("username".equals(currentTokenName))
userName = removeQuotes(currentTokenValue);
if ("realm".equals(currentTokenName))
realmName = removeQuotes(currentTokenValue, true);
if ("nonce".equals(currentTokenName))
nonce = removeQuotes(currentTokenValue);
if ("nc".equals(currentTokenName))
nc = removeQuotes(currentTokenValue);
if ("cnonce".equals(currentTokenName))
cnonce = removeQuotes(currentTokenValue);
if ("qop".equals(currentTokenName))
qop = removeQuotes(currentTokenValue);
if ("uri".equals(currentTokenName))
uri = removeQuotes(currentTokenValue);
if ("response".equals(currentTokenName))
response = removeQuotes(currentTokenValue);
if ("opaque".equals(currentTokenName))
opaque_client = removeQuotes(currentTokenValue);
}
if ( (userName == null) || (realmName == null) || (nonce == null)
|| (uri == null) || (response == null) ) {
return false;
}
// Validate the URI - should match the request line sent by client
if (validateUri) {
String uriQuery;
String query = request.getQueryString();
if (query == null) {
uriQuery = request.getRequestURI();
} else {
uriQuery = request.getRequestURI() + "?" + query;
}
if (!uri.equals(uriQuery)) {
return false;
}
}
// Validate the Realm name
String lcRealm = config.getRealmName();
if (lcRealm == null) {
lcRealm = REALM_NAME;
}
if (!lcRealm.equals(realmName)) {
return false;
}
// Validate the opaque string
if (!this.opaque.equals(opaque_client)) {
return false;
}
// Validate nonce
int i = nonce.indexOf(":");
if (i < 0 || (i + 1) == nonce.length()) {
return false;
}
long nOnceTime;
try {
nOnceTime = Long.parseLong(nonce.substring(0, i));
} catch (NumberFormatException nfe) {
return false;
}
String md5clientIpTimeKey = nonce.substring(i + 1);
long currentTime = System.currentTimeMillis();
if ((currentTime - nOnceTime) > nonceValidity) {
nonceStale = true;
return false;
}
String serverIpTimeKey =
request.getRemoteAddr() + ":" + nOnceTime + ":" + key;
byte[] buffer = digest(serverIpTimeKey.getBytes(Charset.defaultCharset()));
String md5ServerIpTimeKey = new String(digestEncoder.encode(buffer));
if (!md5ServerIpTimeKey.equals(md5clientIpTimeKey)) {
return false;
}
// Validate qop
if (qop != null && !QOP.equals(qop)) {
return false;
}
// Validate cnonce and nc
// Check if presence of nc and nonce is consistent with presence of qop
if (qop == null) {
if (cnonce != null || nc != null) {
return false;
}
} else {
if (cnonce == null || nc == null) {
return false;
}
if (nc.length() != 8) {
return false;
}
try {
Long.parseLong(nc, 16);
} catch (NumberFormatException nfe) {
return false;
}
}
return true;
}
public boolean isNonceStale() {
return nonceStale;
}
}
}
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