private PGStream enableSSL(PGStream pgStream, boolean requireSSL, Properties info, Logger logger)
throws IOException, SQLException {
if (logger.logDebug()) logger.debug(" FE=> SSLRequest");
// Send SSL request packet
pgStream.SendInteger4(8);
pgStream.SendInteger2(1234);
pgStream.SendInteger2(5679);
pgStream.flush();
// Now get the response from the backend, one of N, E, S.
int beresp = pgStream.ReceiveChar();
switch (beresp) {
case 'E':
if (logger.logDebug()) logger.debug(" <=BE SSLError");
// Server doesn't even know about the SSL handshake protocol
if (requireSSL)
throw new PSQLException(
GT.tr("The server does not support SSL."), PSQLState.CONNECTION_FAILURE);
// We have to reconnect to continue.
pgStream.close();
return new PGStream(pgStream.getHost(), pgStream.getPort());
case 'N':
if (logger.logDebug()) logger.debug(" <=BE SSLRefused");
// Server does not support ssl
if (requireSSL)
throw new PSQLException(
GT.tr("The server does not support SSL."), PSQLState.CONNECTION_FAILURE);
return pgStream;
case 'S':
if (logger.logDebug()) logger.debug(" <=BE SSLOk");
// Server supports ssl
Driver.makeSSL(pgStream, info, logger);
return pgStream;
default:
throw new PSQLException(
GT.tr("An error occured while setting up the SSL connection."),
PSQLState.CONNECTION_FAILURE);
}
}
private void sendStartupPacket(PGStream pgStream, String[][] params, Logger logger)
throws IOException {
if (logger.logDebug()) {
String details = "";
for (int i = 0; i < params.length; ++i) {
if (i != 0) details += ", ";
details += params[i][0] + "=" + params[i][1];
}
logger.debug(" FE=> StartupPacket(" + details + ")");
}
/*
* Precalculate message length and encode params.
*/
int length = 4 + 4;
byte[][] encodedParams = new byte[params.length * 2][];
for (int i = 0; i < params.length; ++i) {
encodedParams[i * 2] = params[i][0].getBytes("US-ASCII");
encodedParams[i * 2 + 1] = params[i][1].getBytes("US-ASCII");
length += encodedParams[i * 2].length + 1 + encodedParams[i * 2 + 1].length + 1;
}
length += 1; // Terminating \0
/*
* Send the startup message.
*/
pgStream.SendInteger4(length);
pgStream.SendInteger2(3); // protocol major
pgStream.SendInteger2(0); // protocol minor
for (int i = 0; i < encodedParams.length; ++i) {
pgStream.Send(encodedParams[i]);
pgStream.SendChar(0);
}
pgStream.SendChar(0);
pgStream.flush();
}
public ProtocolConnection openConnectionImpl(
String host, int port, String user, String database, Properties info, Logger logger)
throws SQLException {
// Extract interesting values from the info properties:
// - the SSL setting
boolean requireSSL = (info.getProperty("ssl") != null);
boolean trySSL = requireSSL; // XXX temporary until we revisit the ssl property values
// NOTE: To simplify this code, it is assumed that if we are
// using the V3 protocol, then the database is at least 7.4. That
// eliminates the need to check database versions and maintain
// backward-compatible code here.
//
// Change by Chris Smith <*****@*****.**>
if (logger.logDebug())
logger.debug("Trying to establish a protocol version 3 connection to " + host + ":" + port);
if (!Driver.sslEnabled()) {
if (requireSSL)
throw new PSQLException(
GT.tr("The driver does not support SSL."), PSQLState.CONNECTION_FAILURE);
trySSL = false;
}
//
// Establish a connection.
//
PGStream newStream = null;
try {
newStream = new PGStream(host, port);
// Construct and send an ssl startup packet if requested.
if (trySSL) newStream = enableSSL(newStream, requireSSL, info, logger);
// Construct and send a startup packet.
String[][] params = {
{"user", user},
{"database", database},
{"client_encoding", "UNICODE"},
{"DateStyle", "ISO"},
{"extra_float_digits", "2"}
};
sendStartupPacket(newStream, params, logger);
// Do authentication (until AuthenticationOk).
doAuthentication(newStream, user, info.getProperty("password"), logger);
// Do final startup.
ProtocolConnectionImpl protoConnection =
new ProtocolConnectionImpl(newStream, user, database, info, logger);
readStartupMessages(newStream, protoConnection, logger);
// And we're done.
return protoConnection;
} catch (UnsupportedProtocolException upe) {
// Swallow this and return null so ConnectionFactory tries the next protocol.
if (logger.logDebug()) logger.debug("Protocol not supported, abandoning connection.");
try {
newStream.close();
} catch (IOException e) {
}
return null;
} catch (ConnectException cex) {
// Added by Peter Mount <*****@*****.**>
// ConnectException is thrown when the connection cannot be made.
// we trap this an return a more meaningful message for the end user
throw new PSQLException(
GT.tr(
"Connection refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections."),
PSQLState.CONNECTION_REJECTED,
cex);
} catch (IOException ioe) {
if (newStream != null) {
try {
newStream.close();
} catch (IOException e) {
}
}
throw new PSQLException(
GT.tr("The connection attempt failed."), PSQLState.CONNECTION_UNABLE_TO_CONNECT, ioe);
} catch (SQLException se) {
if (newStream != null) {
try {
newStream.close();
} catch (IOException e) {
}
}
throw se;
}
}
private void readStartupMessages(
PGStream pgStream, ProtocolConnectionImpl protoConnection, Logger logger)
throws IOException, SQLException {
while (true) {
int beresp = pgStream.ReceiveChar();
switch (beresp) {
case 'Z':
// Ready For Query; we're done.
if (pgStream.ReceiveInteger4() != 5)
throw new IOException("unexpected length of ReadyForQuery packet");
char tStatus = (char) pgStream.ReceiveChar();
if (logger.logDebug()) logger.debug(" <=BE ReadyForQuery(" + tStatus + ")");
// Update connection state.
switch (tStatus) {
case 'I':
protoConnection.setTransactionState(ProtocolConnection.TRANSACTION_IDLE);
break;
case 'T':
protoConnection.setTransactionState(ProtocolConnection.TRANSACTION_OPEN);
break;
case 'E':
protoConnection.setTransactionState(ProtocolConnection.TRANSACTION_FAILED);
break;
default:
// Huh?
break;
}
return;
case 'K':
// BackendKeyData
int l_msgLen = pgStream.ReceiveInteger4();
if (l_msgLen != 12)
throw new PSQLException(
GT.tr("Protocol error. Session setup failed."),
PSQLState.CONNECTION_UNABLE_TO_CONNECT);
int pid = pgStream.ReceiveInteger4();
int ckey = pgStream.ReceiveInteger4();
if (logger.logDebug())
logger.debug(" <=BE BackendKeyData(pid=" + pid + ",ckey=" + ckey + ")");
protoConnection.setBackendKeyData(pid, ckey);
break;
case 'E':
// Error
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 + ")");
throw new PSQLException(l_errorMsg);
case 'N':
// Warning
int l_nlen = pgStream.ReceiveInteger4();
ServerErrorMessage l_warnMsg =
new ServerErrorMessage(pgStream.ReceiveString(l_nlen - 4), logger.getLogLevel());
if (logger.logDebug()) logger.debug(" <=BE NoticeResponse(" + l_warnMsg + ")");
protoConnection.addWarning(new PSQLWarning(l_warnMsg));
break;
case 'S':
// ParameterStatus
int l_len = pgStream.ReceiveInteger4();
String name = pgStream.ReceiveString();
String value = pgStream.ReceiveString();
if (logger.logDebug())
logger.debug(" <=BE ParameterStatus(" + name + " = " + value + ")");
if (name.equals("server_version")) protoConnection.setServerVersion(value);
else if (name.equals("client_encoding")) {
if (!value.equals("UNICODE"))
throw new PSQLException(
GT.tr("Protocol error. Session setup failed."),
PSQLState.CONNECTION_UNABLE_TO_CONNECT);
pgStream.setEncoding(Encoding.getDatabaseEncoding("UNICODE"));
} else if (name.equals("standard_conforming_strings")) {
if (value.equals("on")) protoConnection.setStandardConformingStrings(true);
else if (value.equals("off")) protoConnection.setStandardConformingStrings(false);
else
throw new PSQLException(
GT.tr("Protocol error. Session setup failed."),
PSQLState.CONNECTION_UNABLE_TO_CONNECT);
}
break;
default:
if (logger.logDebug()) logger.debug("invalid message type=" + (char) beresp);
throw new PSQLException(
GT.tr("Protocol error. Session setup failed."),
PSQLState.CONNECTION_UNABLE_TO_CONNECT);
}
}
}
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);
}
}
}
