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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
/*
*
* Copyright 2014 McEvoy Software Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.milton.ldap;
import io.milton.http.webdav.PropFindPropertyBuilder;
import com.sun.jndi.ldap.Ber;
import com.sun.jndi.ldap.BerDecoder;
import io.milton.common.LogUtils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.security.auth.callback.*;
import javax.security.sasl.AuthorizeCallback;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslServer;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Handle a caldav connection.
*
* This is the server part of a LDAP client to server connection. This will
* locate information in some user repository (such as a milton carddav
* implementation) and format the results as LDAP messages.
*
*/
public class LdapConnection extends Thread {
private static final Logger log = LoggerFactory.getLogger(LdapConnection.class);
/**
* Sasl server for DIGEST-MD5 authentication
*/
protected SaslServer saslServer;
/**
* raw connection inputStream
*/
protected BufferedInputStream is;
private final UserFactory userFactory;
private final LdapPropertyMapper propertyMapper;
private final LdapResponseHandler responseHandler;
private final LdapParser ldapParser;
private final Socket client;
private final SearchManager searchManager;
private final LdapTransactionManager txManager;
private LdapPrincipal user;
private LineReaderInputStream in;
private final OutputStream os;
// user name and password initialized through connection
private String userName;
private String password;
protected static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
/**
* Initialize the streams and start the thread.
*
* @param clientSocket LDAP client socket
*/
public LdapConnection(Socket clientSocket, UserFactory userSessionFactory, SearchManager searchManager, LdapTransactionManager txManager, PropFindPropertyBuilder propFindPropertyBuilder) {
super(LdapConnection.class.getSimpleName() + '-' + clientSocket.getPort());
this.searchManager = searchManager;
this.client = clientSocket;
this.txManager = txManager;
setDaemon(true);
this.userFactory = userSessionFactory;
this.propertyMapper = new LdapPropertyMapper(propFindPropertyBuilder);
try {
is = new BufferedInputStream(client.getInputStream());
os = new BufferedOutputStream(client.getOutputStream());
} catch (IOException e) {
close();
throw new RuntimeException(e);
}
responseHandler = new LdapResponseHandler(client, os);
ldapParser = new LdapParser(propertyMapper, responseHandler, userFactory);
System.out.println("Created LDAP Connection handler");
}
@Override
public void run() {
byte[] inbuf = new byte[2048]; // Buffer for reading incoming bytes
int bytesread; // Number of bytes in inbuf
int bytesleft; // Number of bytes that need to read for completing resp
int br; // Temp; number of bytes read from stream
int offset; // Offset of where to store bytes in inbuf
boolean eos; // End of stream
try {
while (true) {
offset = 0;
// check that it is the beginning of a sequence
bytesread = is.read(inbuf, offset, 1);
if (bytesread < 0) {
break; // EOF
}
System.out.println("read bytes: " + bytesread);
if (inbuf[offset++] != (Ber.ASN_SEQUENCE | Ber.ASN_CONSTRUCTOR)) {
continue;
}
// get length of sequence
bytesread = is.read(inbuf, offset, 1);
if (bytesread < 0) {
break; // EOF
}
int seqlen = inbuf[offset++]; // Length of ASN sequence
// if high bit is on, length is encoded in the
// subsequent length bytes and the number of length bytes
// is equal to & 0x80 (i.e. length byte with high bit off).
if ((seqlen & 0x80) == 0x80) {
int seqlenlen = seqlen & 0x7f; // number of length bytes
bytesread = 0;
eos = false;
// Read all length bytes
while (bytesread < seqlenlen) {
br = is.read(inbuf, offset + bytesread,
seqlenlen - bytesread);
if (br < 0) {
eos = true;
break; // EOF
}
bytesread += br;
}
// end-of-stream reached before length bytes are read
if (eos) {
break; // EOF
}
// Add contents of length bytes to determine length
seqlen = 0;
for (int i = 0; i < seqlenlen; i++) {
seqlen = (seqlen << 8) + (inbuf[offset + i] & 0xff);
}
offset += bytesread;
}
// read in seqlen bytes
bytesleft = seqlen;
if ((offset + bytesleft) > inbuf.length) {
byte[] nbuf = new byte[offset + bytesleft];
System.arraycopy(inbuf, 0, nbuf, 0, offset);
inbuf = nbuf;
}
while (bytesleft > 0) {
bytesread = is.read(inbuf, offset, bytesleft);
if (bytesread < 0) {
break; // EOF
}
offset += bytesread;
bytesleft -= bytesread;
}
handleRequest(inbuf, offset);
}
} catch (SocketException e) {
log.debug("LOG_CONNECTION_CLOSED");
} catch (SocketTimeoutException e) {
log.debug("LOG_CLOSE_CONNECTION_ON_TIMEOUT");
} catch (Exception e) {
log.error("err", e);
try {
responseHandler.sendErr(0, Ldap.LDAP_REP_BIND, e);
} catch (IOException e2) {
log.warn("LOG_EXCEPTION_SENDING_ERROR_TO_CLIENT", e2);
}
} finally {
searchManager.cancelAllSearches(this);
close();
}
}
protected void handleRequest(final byte[] inbuf, final int offset) throws IOException {
try {
txManager.tx(() -> {
try {
_handleRequest(inbuf, offset);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
});
} catch (Throwable e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else {
throw new RuntimeException(e);
}
}
}
protected void _handleRequest(byte[] inbuf, int offset) throws IOException {
//dumpBer(inbuf, offset);
BerDecoder reqBer = new BerDecoder(inbuf, 0, offset);
int currentMessageId = 0;
try {
reqBer.parseSeq(null);
currentMessageId = reqBer.parseInt();
int requestOperation = reqBer.peekByte();
if (requestOperation == Ldap.LDAP_REQ_BIND) {
reqBer.parseSeq(null);
responseHandler.setVersion(reqBer.parseInt());
userName = reqBer.parseString(responseHandler.isLdapV3());
log.info("Bind user name: " + userName);
if (reqBer.peekByte() == (Ber.ASN_CONTEXT | Ber.ASN_CONSTRUCTOR | 3)) {
// SASL authentication
reqBer.parseSeq(null);
// Get mechanism, usually DIGEST-MD5
String mechanism = reqBer.parseString(responseHandler.isLdapV3());
byte[] serverResponse;
CallbackHandler callbackHandler = callbacks -> {
// look for username in callbacks
for (Callback callback : callbacks) {
if (callback instanceof NameCallback) {
userName = ((NameCallback) callback).getDefaultName();
// get password from session pool
password = userFactory.getUserPassword(userName);
}
}
// handle other callbacks
for (Callback callback : callbacks) {
if (callback instanceof AuthorizeCallback) {
((AuthorizeCallback) callback).setAuthorized(true);
} else if (callback instanceof PasswordCallback) {
if (password != null) {
((PasswordCallback) callback).setPassword(password.toCharArray());
}
}
}
};
int status;
if (reqBer.bytesLeft() > 0 && saslServer != null) {
byte[] clientResponse = reqBer.parseOctetString(Ber.ASN_OCTET_STR, null);
serverResponse = saslServer.evaluateResponse(clientResponse);
status = Ldap.LDAP_SUCCESS;
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_USER", currentMessageId, userName);
user = userFactory.getUser(userName, password);
if( user != null ) {
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_SUCCESS");
} else {
LogUtils.debug(log, "LOG_LDAP_REQ_BIND", "No user! " + userName);
}
} else {
Map properties = new HashMap<>();
properties.put("javax.security.sasl.qop", "auth,auth-int");
saslServer = Sasl.createSaslServer(mechanism, "ldap", client.getLocalAddress().getHostAddress(), properties, callbackHandler);
serverResponse = saslServer.evaluateResponse(EMPTY_BYTE_ARRAY);
status = Ldap.LDAP_SASL_BIND_IN_PROGRESS;
}
responseHandler.sendBindResponse(currentMessageId, status, serverResponse);
} else {
password = reqBer.parseStringWithTag(Ber.ASN_CONTEXT, responseHandler.isLdapV3(), null);
if (userName.length() > 0 && password.length() > 0) {
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_USER", currentMessageId, userName);
try {
user = userFactory.getUser(userName, password);
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_SUCCESS");
responseHandler.sendClient(currentMessageId, Ldap.LDAP_REP_BIND, Ldap.LDAP_SUCCESS, "");
} catch (IOException e) {
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_INVALID_CREDENTIALS");
responseHandler.sendClient(currentMessageId, Ldap.LDAP_REP_BIND, Ldap.LDAP_INVALID_CREDENTIALS, "");
}
} else {
LogUtils.debug(log, "LOG_LDAP_REQ_BIND_ANONYMOUS", currentMessageId);
// anonymous bind
responseHandler.sendClient(currentMessageId, Ldap.LDAP_REP_BIND, Ldap.LDAP_SUCCESS, "");
}
}
} else if (requestOperation == Ldap.LDAP_REQ_UNBIND) {
LogUtils.debug(log, "LOG_LDAP_REQ_UNBIND", currentMessageId);
if (user != null) {
user = null;
}
} else if (requestOperation == Ldap.LDAP_REQ_SEARCH) {
reqBer.parseSeq(null);
String dn = reqBer.parseString(responseHandler.isLdapV3());
log.info("Parsed DN: " + dn);
int scope = reqBer.parseEnumeration();
/*
* int derefAliases =
*/
reqBer.parseEnumeration();
int sizeLimit = reqBer.parseInt();
if (sizeLimit > 100 || sizeLimit == 0) {
sizeLimit = 100;
}
int timelimit = reqBer.parseInt();
/*
* boolean typesOnly =
*/
reqBer.parseBoolean();
LdapFilter ldapFilter = ldapParser.parseFilter(reqBer, user, userName);
Set returningAttributes = ldapParser.parseReturningAttributes(reqBer);
SearchRunnable searchRunnable = new SearchRunnable(userFactory, propertyMapper, currentMessageId, dn, scope, sizeLimit, timelimit, ldapFilter, returningAttributes, responseHandler, user, searchManager);
if (Ldap.BASE_CONTEXT.equalsIgnoreCase(dn) || Ldap.OD_USER_CONTEXT.equalsIgnoreCase(dn) || Ldap.OD_USER_CONTEXT_LION.equalsIgnoreCase(dn)) {
// launch search in a separate thread
searchManager.beginAsyncSearch(this, currentMessageId, searchRunnable);
} else {
// no need to create a separate thread, just run
searchManager.search(this, searchRunnable);
}
} else if (requestOperation == Ldap.LDAP_REQ_ABANDON) {
searchManager.abandonSearch(this, currentMessageId, reqBer);
} else {
LogUtils.debug(log, "LOG_LDAP_UNSUPPORTED_OPERATION", requestOperation);
responseHandler.sendClient(currentMessageId, Ldap.LDAP_REP_RESULT, Ldap.LDAP_OTHER, "Unsupported operation");
}
} catch (IOException e) {
responseHandler.dumpBer(inbuf, offset);
try {
responseHandler.sendErr(currentMessageId, Ldap.LDAP_REP_RESULT, e);
} catch (IOException e2) {
log.debug("LOG_EXCEPTION_SENDING_ERROR_TO_CLIENT", e2);
}
throw e;
}
}
/**
* Close client connection, streams and Exchange session .
*/
public final void close() {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(os);
try {
client.close();
} catch (IOException e2) {
log.warn("LOG_EXCEPTION_CLOSING_CLIENT_SOCKET", e2);
}
}
}