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package android.gov.nist.javax.sip.clientauthutils;
/*
*
* This code has been contributed with permission from:
*
* SIP Communicator, the OpenSource Java VoIP and Instant Messaging client but has been significantly changed.
* It is donated to the JAIN-SIP project as it is common code that many sip clients
* need to perform class and others will consitute a set of utility functions
* that will implement common operations that ease the life of the developer.
*
* Acknowledgements:
* ----------------
*
* Fredrik Wickstrom reported that dialog cseq counters are not incremented
* when resending requests. He later uncovered additional problems and
* proposed a way to fix them (his proposition was taken into account).
*/
import android.gov.nist.core.CommonLogger;
import android.gov.nist.core.LogWriter;
import android.gov.nist.core.StackLogger;
import android.gov.nist.javax.sip.address.SipUri;
import android.gov.nist.javax.sip.header.SIPHeader;
import android.gov.nist.javax.sip.message.SIPRequest;
import android.gov.nist.javax.sip.stack.SIPClientTransaction;
import android.gov.nist.javax.sip.stack.SIPTransactionStack;
import java.text.ParseException;
import java.util.Collection;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Timer;
import android.javax.sip.ClientTransaction;
import android.javax.sip.DialogState;
import android.javax.sip.InvalidArgumentException;
import android.javax.sip.SipException;
import android.javax.sip.SipProvider;
import android.javax.sip.address.Hop;
import android.javax.sip.address.SipURI;
import android.javax.sip.address.URI;
import android.javax.sip.header.AuthorizationHeader;
import android.javax.sip.header.CSeqHeader;
import android.javax.sip.header.Header;
import android.javax.sip.header.HeaderFactory;
import android.javax.sip.header.ProxyAuthenticateHeader;
import android.javax.sip.header.ProxyAuthorizationHeader;
import android.javax.sip.header.ViaHeader;
import android.javax.sip.header.WWWAuthenticateHeader;
import android.javax.sip.message.Request;
import android.javax.sip.message.Response;
/**
* The class handles authentication challenges, caches user credentials and takes care (through
* the SecurityAuthority interface) about retrieving passwords.
*
*
* @author Emil Ivov
* @author Jeroen van Bemmel
* @author M. Ranganathan
*
* @since 2.0
*/
public class AuthenticationHelperImpl implements AuthenticationHelper {
private static StackLogger logger = CommonLogger.getLogger(AuthenticationHelperImpl.class);
/**
* Credentials cached so far.
*/
private CredentialsCache cachedCredentials;
/**
* The account manager for the system. Stores user credentials.
*/
private Object accountManager = null;
/*
* Header factory for this security manager.
*/
private HeaderFactory headerFactory;
private SIPTransactionStack sipStack;
Timer timer;
/**
* Default constructor for the security manager. There is one Account manager. There is one
* SipSecurity manager for every user name,
*
* @param sipStack -- our stack.
* @param accountManager -- an implementation of the AccountManager interface.
* @param headerFactory -- header factory.
*/
public AuthenticationHelperImpl(SIPTransactionStack sipStack, AccountManager accountManager,
HeaderFactory headerFactory) {
this.accountManager = accountManager;
this.headerFactory = headerFactory;
this.sipStack = sipStack;
this.cachedCredentials = new CredentialsCache(((SIPTransactionStack) sipStack).getTimer());
}
/**
* Default constructor for the security manager. There is one Account manager. There is one
* SipSecurity manager for every user name,
*
* @param sipStack -- our stack.
* @param accountManager -- an implementation of the AccountManager interface.
* @param headerFactory -- header factory.
*/
public AuthenticationHelperImpl(SIPTransactionStack sipStack, SecureAccountManager accountManager,
HeaderFactory headerFactory) {
this.accountManager = accountManager;
this.headerFactory = headerFactory;
this.sipStack = sipStack;
this.cachedCredentials = new CredentialsCache(((SIPTransactionStack) sipStack).getTimer());
}
/*
* (non-Javadoc)
*
* @see android.gov.nist.javax.sip.clientauthutils.AuthenticationHelper#handleChallenge(android.javax.sip.message.Response,
* android.javax.sip.ClientTransaction, android.javax.sip.SipProvider)
*/
public ClientTransaction handleChallenge(Response challenge,
ClientTransaction challengedTransaction, SipProvider transactionCreator, int cacheTime)
throws SipException, NullPointerException {
return handleChallenge(challenge, challengedTransaction, transactionCreator, cacheTime, false);
}
/*
* (non-Javadoc)
*
* @see android.gov.nist.javax.sip.clientauthutils.AuthenticationHelper#handleChallenge(android.javax.sip.message.Response,
* android.javax.sip.ClientTransaction, android.javax.sip.SipProvider)
*/
public ClientTransaction handleChallenge(Response challenge,
ClientTransaction challengedTransaction, SipProvider transactionCreator, int cacheTime, boolean looseRouting)
throws SipException, NullPointerException {
try {
if ( logger.isLoggingEnabled(LogWriter.TRACE_DEBUG))
logger.logDebug("handleChallenge: " + challenge);
SIPRequest challengedRequest = ((SIPRequest) challengedTransaction.getRequest());
Request reoriginatedRequest = null;
/*
* If the challenged request is part of a Dialog and the
* Dialog is confirmed the re-originated request should be
* generated as an in-Dialog request.
*/
if ( challengedRequest.getToTag() != null ||
challengedTransaction.getDialog() == null ||
challengedTransaction.getDialog().getState() != DialogState.CONFIRMED) {
reoriginatedRequest = (Request) challengedRequest.clone();
} else {
/*
* Re-originate the request by consulting the dialog. In particular
* the route set could change between the original request and the
* in-dialog challenge.
*/
reoriginatedRequest =
challengedTransaction.getDialog().createRequest(challengedRequest.getMethod());
Iterator headerNames = challengedRequest.getHeaderNames();
while (headerNames.hasNext()) {
String headerName = headerNames.next();
if ( reoriginatedRequest.getHeader(headerName) == null) {
ListIterator iterator = challengedRequest.getHeaders(headerName);
while (iterator.hasNext()) { reoriginatedRequest.addHeader(iterator.next()); }
}
}
}
// remove the branch id so that we could use the request in a new
// transaction
removeBranchID(reoriginatedRequest);
if (challenge == null || reoriginatedRequest == null) {
throw new NullPointerException("A null argument was passed to handle challenge.");
}
ListIterator authHeaders = null;
if (challenge.getStatusCode() == Response.UNAUTHORIZED) {
authHeaders = challenge.getHeaders(WWWAuthenticateHeader.NAME);
} else if (challenge.getStatusCode() == Response.PROXY_AUTHENTICATION_REQUIRED) {
authHeaders = challenge.getHeaders(ProxyAuthenticateHeader.NAME);
} else {
throw new IllegalArgumentException("Unexpected status code ");
}
if (authHeaders == null) {
throw new IllegalArgumentException(
"Could not find WWWAuthenticate or ProxyAuthenticate headers");
}
// Remove all authorization headers from the request (we'll re-add them
// from cache)
reoriginatedRequest.removeHeader(AuthorizationHeader.NAME);
reoriginatedRequest.removeHeader(ProxyAuthorizationHeader.NAME);
// rfc 3261 says that the cseq header should be augmented for the new
// request. do it here so that the new dialog (created together with
// the new client transaction) takes it into account.
// Bug report - Fredrik Wickstrom
CSeqHeader cSeq = (CSeqHeader) reoriginatedRequest.getHeader((CSeqHeader.NAME));
try {
cSeq.setSeqNumber(cSeq.getSeqNumber() + 1l);
} catch (InvalidArgumentException ex) {
throw new SipException("Invalid CSeq -- could not increment : "
+ cSeq.getSeqNumber());
}
/* Resolve this to the next hop based on the previous lookup. If we are not using
* lose routing (RFC2543) then just attach hop as a maddr param.
*/
if (!looseRouting && challengedRequest.getRouteHeaders() == null ) {
Hop hop = ((SIPClientTransaction) challengedTransaction).getNextHop();
SipURI sipUri = (SipURI) reoriginatedRequest.getRequestURI();
sipUri.setMAddrParam(hop.getHost());
if ( hop.getPort() != -1 ) sipUri.setPort(hop.getPort());
}
ClientTransaction retryTran = transactionCreator
.getNewClientTransaction(reoriginatedRequest);
WWWAuthenticateHeader authHeader = null;
SipURI requestUri = (SipURI) challengedTransaction.getRequest().getRequestURI();
while (authHeaders.hasNext()) {
authHeader = (WWWAuthenticateHeader) authHeaders.next();
String realm = authHeader.getRealm();
AuthorizationHeader authorization = null;
String sipDomain;
if ( this.accountManager instanceof SecureAccountManager ) {
UserCredentialHash credHash =
((SecureAccountManager)this.accountManager).getCredentialHash(challengedTransaction,realm);
if ( credHash == null ) {
logger.logDebug("Could not find creds");
throw new SipException(
"Cannot find user creds for the given user name and realm");
}
URI uri = reoriginatedRequest.getRequestURI();
sipDomain = credHash.getSipDomain();
authorization = this.getAuthorization(reoriginatedRequest
.getMethod(), uri.toString(),
(reoriginatedRequest.getContent() == null) ? "" : new String(
reoriginatedRequest.getRawContent()), authHeader, credHash);
} else {
UserCredentials userCreds = ((AccountManager) this.accountManager).getCredentials(challengedTransaction, realm);
if (userCreds == null) {
throw new SipException(
"Cannot find user creds for the given user name and realm");
}
sipDomain = userCreds.getSipDomain();
// we haven't yet authenticated this realm since we were
// started.
authorization = this.getAuthorization(reoriginatedRequest
.getMethod(), reoriginatedRequest.getRequestURI().toString(),
(reoriginatedRequest.getContent() == null) ? "" : new String(
reoriginatedRequest.getRawContent()), authHeader, userCreds);
}
if ( logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug(
"Created authorization header: " + authorization.toString());
}
if (cacheTime != 0) {
String callId = challengedRequest.getCallId().getCallId();
cachedCredentials.cacheAuthorizationHeader(callId,
authorization, cacheTime);
}
reoriginatedRequest.addHeader(authorization);
}
if ( logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
logger.logDebug(
"Returning authorization transaction." + retryTran);
}
return retryTran;
} catch (SipException ex) {
throw ex;
} catch (Exception ex) {
logger.logError("Unexpected exception ", ex);
throw new SipException("Unexpected exception ", ex);
}
}
/**
* Generates an authorisation header in response to wwwAuthHeader.
*
* @param method method of the request being authenticated
* @param uri digest-uri
* @param requestBody the body of the request.
* @param authHeader the challenge that we should respond to
* @param userCredentials username and pass
*
* @return an authorisation header in response to authHeader.
*
* @throws OperationFailedException if auth header was malformated.
*/
private AuthorizationHeader getAuthorization(String method, String uri, String requestBody,
WWWAuthenticateHeader authHeader, UserCredentials userCredentials) {
String response = null;
// JvB: authHeader.getQop() is a quoted _list_ of qop values
// (e.g. "auth,auth-int") Client is supposed to pick one
String qopList = authHeader.getQop();
String qop = (qopList != null) ? "auth" : null;
String nc_value = "00000001";
String cnonce = "xyz";
response = MessageDigestAlgorithm.calculateResponse(authHeader.getAlgorithm(),
userCredentials.getUserName(), authHeader.getRealm(), userCredentials
.getPassword(), authHeader.getNonce(), nc_value, // JvB added
cnonce, // JvB added
method, uri, requestBody, qop,logger);// jvb changed
AuthorizationHeader authorization = null;
try {
if (authHeader instanceof ProxyAuthenticateHeader) {
authorization = headerFactory.createProxyAuthorizationHeader(authHeader
.getScheme());
} else {
authorization = headerFactory.createAuthorizationHeader(authHeader.getScheme());
}
authorization.setUsername(userCredentials.getUserName());
authorization.setRealm(authHeader.getRealm());
authorization.setNonce(authHeader.getNonce());
authorization.setParameter("uri", uri);
authorization.setResponse(response);
if (authHeader.getAlgorithm() != null) {
authorization.setAlgorithm(authHeader.getAlgorithm());
}
if (authHeader.getOpaque() != null) {
authorization.setOpaque(authHeader.getOpaque());
}
// jvb added
if (qop != null) {
authorization.setQop(qop);
authorization.setCNonce(cnonce);
authorization.setNonceCount(Integer.parseInt(nc_value));
}
authorization.setResponse(response);
} catch (ParseException ex) {
throw new RuntimeException("Failed to create an authorization header!");
}
return authorization;
}
/**
* Generates an authorisation header in response to wwwAuthHeader.
*
* @param method method of the request being authenticated
* @param uri digest-uri
* @param requestBody the body of the request.
* @param authHeader the challenge that we should respond to
* @param userCredentials username and pass
*
* @return an authorisation header in response to authHeader.
*
* @throws OperationFailedException if auth header was malformated.
*/
private AuthorizationHeader getAuthorization(String method, String uri, String requestBody,
WWWAuthenticateHeader authHeader, UserCredentialHash userCredentials) {
String response = null;
// JvB: authHeader.getQop() is a quoted _list_ of qop values
// (e.g. "auth,auth-int") Client is supposed to pick one
String qopList = authHeader.getQop();
String qop = (qopList != null) ? "auth" : null;
String nc_value = "00000001";
String cnonce = "xyz";
response = MessageDigestAlgorithm.calculateResponse(authHeader.getAlgorithm(),
userCredentials.getHashUserDomainPassword(), authHeader.getNonce(), nc_value, // JvB added
cnonce, // JvB added
method, uri, requestBody, qop,logger);// jvb changed
AuthorizationHeader authorization = null;
try {
if (authHeader instanceof ProxyAuthenticateHeader) {
authorization = headerFactory.createProxyAuthorizationHeader(authHeader
.getScheme());
} else {
authorization = headerFactory.createAuthorizationHeader(authHeader.getScheme());
}
authorization.setUsername(userCredentials.getUserName());
authorization.setRealm(authHeader.getRealm());
authorization.setNonce(authHeader.getNonce());
authorization.setParameter("uri", uri);
authorization.setResponse(response);
if (authHeader.getAlgorithm() != null) {
authorization.setAlgorithm(authHeader.getAlgorithm());
}
if (authHeader.getOpaque() != null) {
authorization.setOpaque(authHeader.getOpaque());
}
// jvb added
if (qop != null) {
authorization.setQop(qop);
authorization.setCNonce(cnonce);
authorization.setNonceCount(Integer.parseInt(nc_value));
}
authorization.setResponse(response);
} catch (ParseException ex) {
throw new RuntimeException("Failed to create an authorization header!");
}
return authorization;
}
/**
* Removes all via headers from request and replaces them with a new one, equal to
* the one that was top most.
*
* @param request the Request whose branchID we'd like to remove.
*
*/
private void removeBranchID(Request request) {
ViaHeader viaHeader = (ViaHeader) request.getHeader(ViaHeader.NAME);
viaHeader.removeParameter("branch");
}
/*
* (non-Javadoc)
*
* @see android.gov.nist.javax.sip.clientauthutils.AuthenticationHelper#attachAuthenticationHeaders(android.javax.sip.message.Request)
*/
public void setAuthenticationHeaders(Request request) {
SIPRequest sipRequest = (SIPRequest) request;
String callId = sipRequest.getCallId().getCallId();
request.removeHeader(AuthorizationHeader.NAME);
Collection authHeaders = this.cachedCredentials
.getCachedAuthorizationHeaders(callId);
if (authHeaders == null) {
if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG))
logger.logDebug(
"Could not find authentication headers for " + callId);
return;
}
for (AuthorizationHeader authHeader : authHeaders) {
request.addHeader(authHeader);
}
}
/*
* (non-Javadoc)
*
* @see android.gov.nist.javax.sip.clientauthutils.AuthenticationHelper#removeCachedAuthenticationHeaders(java.lang.String)
*/
public void removeCachedAuthenticationHeaders(String callId) {
if (callId == null)
throw new NullPointerException("Null callId argument ");
this.cachedCredentials.removeAuthenticationHeader(callId);
}
}
