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/*-------------------------------------------------------------------------
*
* Copyright (c) 2008-2011, PostgreSQL Global Development Group
*
*
*-------------------------------------------------------------------------
*/
package org.postgresql.gss;
import org.ietf.jgss.*;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import java.security.PrivilegedAction;
import java.io.IOException;
import java.sql.SQLException;
import org.postgresql.core.PGStream;
import org.postgresql.core.Logger;
import org.postgresql.util.*;
public class MakeGSS
{
public static void authenticate(PGStream pgStream, String host, String user, String password, String jaasApplicationName, String kerberosServerName, Logger logger, boolean useSpnego) throws IOException, SQLException
{
if (logger.logDebug())
logger.debug(" <=BE AuthenticationReqGSS");
Object result = null;
if (jaasApplicationName == null)
jaasApplicationName = "pgjdbc";
if (kerberosServerName == null)
kerberosServerName = "postgres";
try {
LoginContext lc = new LoginContext(jaasApplicationName, new GSSCallbackHandler(user, password));
lc.login();
Subject sub = lc.getSubject();
PrivilegedAction action = new GssAction(pgStream, host, user, password, kerberosServerName, logger, useSpnego);
result = Subject.doAs(sub, action);
} catch (Exception e) {
throw new PSQLException(GT.tr("GSS Authentication failed"), PSQLState.CONNECTION_FAILURE, e);
}
if (result instanceof IOException)
throw (IOException)result;
else if (result instanceof SQLException)
throw (SQLException)result;
else if (result != null)
throw new PSQLException(GT.tr("GSS Authentication failed"), PSQLState.CONNECTION_FAILURE, (Exception)result);
}
}
class GssAction implements PrivilegedAction
{
private final PGStream pgStream;
private final String host;
private final String user;
private final String password;
private final String kerberosServerName;
private final Logger logger;
private final boolean useSpnego;
public GssAction(PGStream pgStream, String host, String user, String password, String kerberosServerName, Logger logger, boolean useSpnego)
{
this.pgStream = pgStream;
this.host = host;
this.user = user;
this.password = password;
this.kerberosServerName = kerberosServerName;
this.logger = logger;
this.useSpnego = useSpnego;
}
private static boolean hasSpnegoSupport(GSSManager manager) throws GSSException {
org.ietf.jgss.Oid spnego = new org.ietf.jgss.Oid("1.3.6.1.5.5.2");
org.ietf.jgss.Oid mechs[] = manager.getMechs();
for (int i = 0; i < mechs.length; ++i) {
if (mechs[i].equals(spnego)) {
return true;
}
}
return false;
}
public Object run() {
try {
GSSManager manager = GSSManager.getInstance();
org.ietf.jgss.Oid desiredMechs[] = new org.ietf.jgss.Oid[1];
if (useSpnego && hasSpnegoSupport(manager)) {
desiredMechs[0] = new org.ietf.jgss.Oid("1.3.6.1.5.5.2");
} else {
desiredMechs[0] = new org.ietf.jgss.Oid("1.2.840.113554.1.2.2");
}
GSSName clientName = manager.createName(user, GSSName.NT_USER_NAME);
GSSCredential clientCreds = manager.createCredential(clientName, 8*3600, desiredMechs, GSSCredential.INITIATE_ONLY);
GSSName serverName = manager.createName(kerberosServerName + "@" + host, GSSName.NT_HOSTBASED_SERVICE);
GSSContext secContext = manager.createContext(serverName, desiredMechs[0], clientCreds, GSSContext.DEFAULT_LIFETIME);
secContext.requestMutualAuth(true);
byte inToken[] = new byte[0];
byte outToken[] = null;
boolean established = false;
while (!established) {
outToken = secContext.initSecContext(inToken, 0, inToken.length);
if (outToken != null) {
if (logger.logDebug())
logger.debug(" FE=> Password(GSS Authentication Token)");
pgStream.SendChar('p');
pgStream.SendInteger4(4 + outToken.length);
pgStream.Send(outToken);
pgStream.flush();
}
if (!secContext.isEstablished()) {
int response = pgStream.ReceiveChar();
// Error
if (response == 'E') {
int l_elen = pgStream.ReceiveInteger4();
ServerErrorMessage l_errorMsg = new ServerErrorMessage(pgStream.ReceiveString(l_elen - 4), logger.getLogLevel());
if (logger.logDebug())
logger.debug(" <=BE ErrorMessage(" + l_errorMsg + ")");
return new PSQLException(l_errorMsg);
} else if (response == 'R') {
if (logger.logDebug())
logger.debug(" <=BE AuthenticationGSSContinue");
int len = pgStream.ReceiveInteger4();
int type = pgStream.ReceiveInteger4();
// should check type = 8
inToken = pgStream.Receive(len - 8);
} else {
// Unknown/unexpected message type.
return new PSQLException(GT.tr("Protocol error. Session setup failed."), PSQLState.CONNECTION_UNABLE_TO_CONNECT);
}
} else {
established = true;
}
}
} catch (IOException e) {
return e;
} catch (GSSException gsse) {
return new PSQLException(GT.tr("GSS Authentication failed"), PSQLState.CONNECTION_FAILURE, gsse);
}
return null;
}
}
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