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/**
* This file is part of Graylog.
*
* Graylog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog. If not, see .
*/
package org.graylog2.security.ldap;
import com.google.common.util.concurrent.SimpleTimeLimiter;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.google.common.util.concurrent.UncheckedTimeoutException;
import org.apache.directory.api.ldap.model.cursor.CursorException;
import org.apache.directory.api.ldap.model.cursor.EntryCursor;
import org.apache.directory.api.ldap.model.entry.Attribute;
import org.apache.directory.api.ldap.model.entry.Entry;
import org.apache.directory.api.ldap.model.exception.LdapException;
import org.apache.directory.api.ldap.model.message.BindRequestImpl;
import org.apache.directory.api.ldap.model.message.BindResponse;
import org.apache.directory.api.ldap.model.message.ResultCodeEnum;
import org.apache.directory.api.ldap.model.message.SearchScope;
import org.apache.directory.ldap.client.api.LdapConnectionConfig;
import org.apache.directory.ldap.client.api.LdapNetworkConnection;
import org.graylog2.shared.security.ldap.LdapEntry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.StandardCharsets;
import java.text.MessageFormat;
import java.util.Iterator;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
public class LdapConnector {
private static final Logger LOG = LoggerFactory.getLogger(LdapConnector.class);
private final int connectionTimeout;
public LdapConnector(final int connectionTimeout) {
this.connectionTimeout = connectionTimeout;
}
public LdapNetworkConnection connect(LdapConnectionConfig config) throws LdapException {
final LdapNetworkConnection connection = new LdapNetworkConnection(config);
connection.setTimeOut(connectionTimeout);
if (LOG.isTraceEnabled()) {
LOG.trace("Connecting to LDAP server {}:{}, binding with user {}",
config.getLdapHost(), config.getLdapPort(), config.getName());
}
// this will perform an anonymous bind if there were no system credentials
final ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat("ldap-connector-%d").build();
final SimpleTimeLimiter timeLimiter = new SimpleTimeLimiter(Executors.newSingleThreadExecutor(threadFactory));
@SuppressWarnings("unchecked")
final Callable timeLimitedConnection = timeLimiter.newProxy(
new Callable() {
@Override
public Boolean call() throws Exception {
return connection.connect();
}
}, Callable.class,
connectionTimeout, TimeUnit.MILLISECONDS);
try {
final Boolean connected = timeLimitedConnection.call();
if (!connected) {
return null;
}
} catch (UncheckedTimeoutException e) {
LOG.error("Timed out connecting to LDAP server", e);
throw new LdapException("Could not connect to LDAP server", e.getCause());
} catch (LdapException e) {
throw e;
} catch (Exception e) {
// unhandled different exception, should really not happen here.
throw new LdapException("Unexpected error connecting to LDAP", e);
}
connection.bind();
return connection;
}
public LdapEntry search(LdapNetworkConnection connection, String searchBase, String searchPattern, String principal, boolean activeDirectory) throws LdapException, CursorException {
final LdapEntry ldapEntry = new LdapEntry();
final String filter = MessageFormat.format(searchPattern, sanitizePrincipal(principal));
if (LOG.isTraceEnabled()) {
LOG.trace("Search {} for {}, starting at {}",
activeDirectory ? "ActiveDirectory" : "LDAP", filter, searchBase);
}
final EntryCursor entryCursor = connection.search(searchBase,
filter,
SearchScope.SUBTREE,
"*");
final Iterator it = entryCursor.iterator();
if (it.hasNext()) {
final Entry e = it.next();
// for generic LDAP use the dn of the entry for the subsequent bind, active directory needs the userPrincipalName attribute (set below)
if (!activeDirectory) {
ldapEntry.setDn(e.getDn().getName());
}
for (Attribute attribute : e.getAttributes()) {
if (activeDirectory && attribute.getId().equalsIgnoreCase("userPrincipalName")) {
ldapEntry.setDn(attribute.getString());
}
if (attribute.isHumanReadable()) {
ldapEntry.put(attribute.getId(), attribute.getString());
}
}
} else {
LOG.trace("No LDAP entry found for filter {}", filter);
return null;
}
LOG.trace("LDAP search found entry for DN {} with search filter {}", ldapEntry.getDn(), filter);
return ldapEntry;
}
/**
* Escapes any special chars (RFC 4515) from a string representing a
* a search filter assertion value.
*
* @param input The input string.
* @return A assertion value string ready for insertion into a
* search filter string.
*/
private String sanitizePrincipal(final String input) {
String s = "";
for (int i = 0; i < input.length(); i++) {
char c = input.charAt(i);
if (c == '*') {
// escape asterisk
s += "\\2a";
} else if (c == '(') {
// escape left parenthesis
s += "\\28";
} else if (c == ')') {
// escape right parenthesis
s += "\\29";
} else if (c == '\\') {
// escape backslash
s += "\\5c";
} else if (c == '\u0000') {
// escape NULL char
s += "\\00";
} else if (c <= 0x7f) {
// regular 1-byte UTF-8 char
s += String.valueOf(c);
} else if (c >= 0x080) {
// higher-order 2, 3 and 4-byte UTF-8 chars
byte[] utf8bytes = String.valueOf(c).getBytes(StandardCharsets.UTF_8);
for (byte b : utf8bytes) {
s += String.format("\\%02x", b);
}
}
}
return s;
}
public boolean authenticate(LdapNetworkConnection connection, String principal, String credentials) throws LdapException {
final BindRequestImpl bindRequest = new BindRequestImpl();
bindRequest.setName(principal);
bindRequest.setCredentials(credentials);
LOG.trace("Re-binding with DN {} using password", principal);
final BindResponse bind = connection.bind(bindRequest);
if (!bind.getLdapResult().getResultCode().equals(ResultCodeEnum.SUCCESS)) {
LOG.trace("Re-binding DN {} failed", principal);
throw new RuntimeException(bind.toString());
}
LOG.trace("Binding DN {} did not throw, connection authenticated: {}", principal, connection.isAuthenticated());
return connection.isAuthenticated();
}
}
