private void doAuthentication(PGStream pgStream, String user, String password, Logger logger)
throws IOException, SQLException {
// Now get the response from the backend, either an error message
// or an authentication request
while (true) {
int beresp = pgStream.ReceiveChar();
switch (beresp) {
case 'E':
// An error occured, so pass the error message to the
// user.
//
// The most common one to be thrown here is:
// "User authentication failed"
//
int l_elen = pgStream.ReceiveInteger4();
if (l_elen > 30000) {
// if the error length is > than 30000 we assume this is really a v2 protocol
// server, so trigger fallback.
throw new UnsupportedProtocolException();
}
ServerErrorMessage errorMsg =
new ServerErrorMessage(pgStream.ReceiveString(l_elen - 4), logger.getLogLevel());
if (logger.logDebug()) logger.debug(" <=BE ErrorMessage(" + errorMsg + ")");
throw new PSQLException(errorMsg);
case 'R':
// Authentication request.
// Get the message length
int l_msgLen = pgStream.ReceiveInteger4();
// Get the type of request
int areq = pgStream.ReceiveInteger4();
// Process the request.
switch (areq) {
case AUTH_REQ_CRYPT:
{
byte[] rst = new byte[2];
rst[0] = (byte) pgStream.ReceiveChar();
rst[1] = (byte) pgStream.ReceiveChar();
String salt = new String(rst, 0, 2, "US-ASCII");
if (logger.logDebug())
logger.debug(" <=BE AuthenticationReqCrypt(salt='" + salt + "')");
if (password == null)
throw new PSQLException(
GT.tr(
"The server requested password-based authentication, but no password was provided."),
PSQLState.CONNECTION_REJECTED);
String result = UnixCrypt.crypt(salt, password);
byte[] encodedResult = result.getBytes("US-ASCII");
if (logger.logDebug()) logger.debug(" FE=> Password(crypt='" + result + "')");
pgStream.SendChar('p');
pgStream.SendInteger4(4 + encodedResult.length + 1);
pgStream.Send(encodedResult);
pgStream.SendChar(0);
pgStream.flush();
break;
}
case AUTH_REQ_MD5:
{
byte[] md5Salt = pgStream.Receive(4);
if (logger.logDebug()) {
logger.debug(
" <=BE AuthenticationReqMD5(salt=" + Utils.toHexString(md5Salt) + ")");
}
if (password == null)
throw new PSQLException(
GT.tr(
"The server requested password-based authentication, but no password was provided."),
PSQLState.CONNECTION_REJECTED);
byte[] digest = MD5Digest.encode(user, password, md5Salt);
if (logger.logDebug()) {
logger.debug(" FE=> Password(md5digest=" + new String(digest, "US-ASCII") + ")");
}
pgStream.SendChar('p');
pgStream.SendInteger4(4 + digest.length + 1);
pgStream.Send(digest);
pgStream.SendChar(0);
pgStream.flush();
break;
}
case AUTH_REQ_PASSWORD:
{
if (logger.logDebug()) {
logger.debug(" <=BE AuthenticationReqPassword");
logger.debug(" FE=> Password(password=<not shown>)");
}
if (password == null)
throw new PSQLException(
GT.tr(
"The server requested password-based authentication, but no password was provided."),
PSQLState.CONNECTION_REJECTED);
byte[] encodedPassword = password.getBytes("US-ASCII");
pgStream.SendChar('p');
pgStream.SendInteger4(4 + encodedPassword.length + 1);
pgStream.Send(encodedPassword);
pgStream.SendChar(0);
pgStream.flush();
break;
}
case AUTH_REQ_OK:
if (logger.logDebug()) logger.debug(" <=BE AuthenticationOk");
return; // We're done.
default:
if (logger.logDebug())
logger.debug(" <=BE AuthenticationReq (unsupported type " + ((int) areq) + ")");
throw new PSQLException(
GT.tr(
"The authentication type {0} is not supported. Check that you have configured the pg_hba.conf file to include the client''s IP address or subnet, and that it is using an authentication scheme supported by the driver.",
new Integer(areq)),
PSQLState.CONNECTION_REJECTED);
}
break;
default:
throw new PSQLException(
GT.tr("Protocol error. Session setup failed."),
PSQLState.CONNECTION_UNABLE_TO_CONNECT);
}
}
}
public int getServerVersionNum() {
if (serverVersionNum != 0) return serverVersionNum;
return Utils.parseServerVersionStr(serverVersion);
}