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package com.sun.security.sasl.ntlm;

import com.sun.security.ntlm.NTLMException;
import com.sun.security.ntlm.Server;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Map;
import java.util.Random;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.*;


Required callbacks:
- RealmCallback
     used as key by handler to fetch password, optional
- NameCallback
     used as key by handler to fetch password
- PasswordCallback
     handler must enter password for username/realm supplied
Environment properties that affect the implementation:
javax.security.sasl.qop
   String, quality of protection; only "auth" is accepted, default "auth"
com.sun.security.sasl.ntlm.version
   String, name a specific version to accept:
     LM/NTLM: Original NTLM v1
     LM: Original NTLM v1, LM only
     NTLM: Original NTLM v1, NTLM only
     NTLM2: NTLM v1 with Client Challenge
     LMv2/NTLMv2: NTLM v2
     LMv2: NTLM v2, LM only
     NTLMv2: NTLM v2, NTLM only
   If not specified, use system property "ntlm.version". If also
   not specified, all versions are accepted.
com.sun.security.sasl.ntlm.domain
   String, the domain of the server, default is server name (fqdn parameter)
com.sun.security.sasl.ntlm.random
   java.util.Random, the nonce source. Default null, an internal
   java.util.Random object will be used
Negotiated Properties:
javax.security.sasl.qop
   Always "auth"
com.sun.security.sasl.ntlm.hostname
   The hostname for the user, provided by the client

/**
  * Required callbacks:
  * - RealmCallback
  *      used as key by handler to fetch password, optional
  * - NameCallback
  *      used as key by handler to fetch password
  * - PasswordCallback
  *      handler must enter password for username/realm supplied
  *
  * Environment properties that affect the implementation:
  *
  * javax.security.sasl.qop
  *    String, quality of protection; only "auth" is accepted, default "auth"
  *
  * com.sun.security.sasl.ntlm.version
  *    String, name a specific version to accept:
  *      LM/NTLM: Original NTLM v1
  *      LM: Original NTLM v1, LM only
  *      NTLM: Original NTLM v1, NTLM only
  *      NTLM2: NTLM v1 with Client Challenge
  *      LMv2/NTLMv2: NTLM v2
  *      LMv2: NTLM v2, LM only
  *      NTLMv2: NTLM v2, NTLM only
  *    If not specified, use system property "ntlm.version". If also
  *    not specified, all versions are accepted.
  *
  * com.sun.security.sasl.ntlm.domain
  *    String, the domain of the server, default is server name (fqdn parameter)
  *
  * com.sun.security.sasl.ntlm.random
  *    java.util.Random, the nonce source. Default null, an internal
  *    java.util.Random object will be used
  *
  * Negotiated Properties:
  *
  * javax.security.sasl.qop
  *    Always "auth"
  *
  * com.sun.security.sasl.ntlm.hostname
  *    The hostname for the user, provided by the client
  *
  */

final class NTLMServer implements SaslServer {

    private final static String NTLM_VERSION =
            "com.sun.security.sasl.ntlm.version";
    private final static String NTLM_DOMAIN =
            "com.sun.security.sasl.ntlm.domain";
    private final static String NTLM_HOSTNAME =
            "com.sun.security.sasl.ntlm.hostname";
    private static final String NTLM_RANDOM =
            "com.sun.security.sasl.ntlm.random";

    private final Random random;
    private final Server server;
    private byte[] nonce;
    private int step = 0;
    private String authzId;
    private final String mech;
    private String hostname;

    
Params:
  • mech – not null
  • protocol – not null for Sasl, ignored in NTLM
  • serverName – not null for Sasl, can be null in NTLM. If non-null,
might be used as domain if not provided in props
  • props – can be null
  • cbh – can be null for Sasl, already null-checked in factory
Throws:
/**
     * @param mech not null
     * @param protocol not null for Sasl, ignored in NTLM
     * @param serverName not null for Sasl, can be null in NTLM. If non-null,
     * might be used as domain if not provided in props
     * @param props can be null
     * @param cbh can be null for Sasl, already null-checked in factory
     * @throws SaslException
     */
    NTLMServer(String mech, String protocol, String serverName,
            Map<String, ?> props, final CallbackHandler cbh)
            throws SaslException {

        this.mech = mech;
        String version = null;
        String domain = null;
        Random rtmp = null;

        if (props != null) {
            domain = (String) props.get(NTLM_DOMAIN);
            version = (String)props.get(NTLM_VERSION);
            rtmp = (Random)props.get(NTLM_RANDOM);
        }
        random = rtmp != null ? rtmp : new Random();

        if (version == null) {
            version = System.getProperty("ntlm.version");
        }
        if (domain == null) {
            domain = serverName;
        }
        if (domain == null) {
            throw new SaslException("Domain must be provided as"
                    + " the serverName argument or in props");
        }

        try {
            server = new Server(version, domain) {
                public char[] getPassword(String ntdomain, String username) {
                    try {
                        RealmCallback rcb =
                                (ntdomain == null || ntdomain.isEmpty())
                                    ? new RealmCallback("Domain: ")
                                    : new RealmCallback("Domain: ", ntdomain);
                        NameCallback ncb = new NameCallback(
                                "Name: ", username);
                        PasswordCallback pcb = new PasswordCallback(
                                "Password: ", false);
                        cbh.handle(new Callback[] { rcb, ncb, pcb });
                        char[] passwd = pcb.getPassword();
                        pcb.clearPassword();
                        return passwd;
                    } catch (IOException ioe) {
                        return null;
                    } catch (UnsupportedCallbackException uce) {
                        return null;
                    }
                }
            };
        } catch (NTLMException ne) {
            throw new SaslException(
                    "NTLM: server creation failure", ne);
        }
        nonce = new byte[8];
    }

    @Override
    public String getMechanismName() {
        return mech;
    }

    @Override
    public byte[] evaluateResponse(byte[] response) throws SaslException {
        try {
            step++;
            if (step == 1) {
                random.nextBytes(nonce);
                return server.type2(response, nonce);
            } else {
                String[] out = server.verify(response, nonce);
                authzId = out[0];
                hostname = out[1];
                return null;
            }
        } catch (NTLMException ex) {
            throw new SaslException("NTLM: generate response failure", ex);
        }
    }

    @Override
    public boolean isComplete() {
        return step >= 2;
    }

    @Override
    public String getAuthorizationID() {
        if (!isComplete()) {
            throw new IllegalStateException("authentication not complete");
        }
        return authzId;
    }

    @Override
    public byte[] unwrap(byte[] incoming, int offset, int len)
            throws SaslException {
        throw new IllegalStateException("Not supported yet.");
    }

    @Override
    public byte[] wrap(byte[] outgoing, int offset, int len)
            throws SaslException {
        throw new IllegalStateException("Not supported yet.");
    }

    @Override
    public Object getNegotiatedProperty(String propName) {
        if (!isComplete()) {
            throw new IllegalStateException("authentication not complete");
        }
        switch (propName) {
            case Sasl.QOP:
                return "auth";
            case NTLM_HOSTNAME:
                return hostname;
            default:
                return null;
        }
    }

    @Override
    public void dispose() throws SaslException {
        return;
    }
}