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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.auth.ldap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.naming.NamingException;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchResult;
import javax.security.auth.login.Configuration;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.api.server.ServerSide;
/**
* @author Evgeny Mandrikov
*/
@ServerSide
public class DefaultLdapAuthenticator implements LdapAuthenticator {
private static final Pattern SANITIZE_PATTERN = Pattern.compile("[\n\r]");
private static final Logger LOG = LoggerFactory.getLogger(DefaultLdapAuthenticator.class);
private final Map<String, LdapContextFactory> contextFactories;
private final Map<String, LdapUserMapping> userMappings;
public DefaultLdapAuthenticator(Map<String, LdapContextFactory> contextFactories, Map<String, LdapUserMapping> userMappings) {
this.contextFactories = contextFactories;
this.userMappings = userMappings;
}
@Override
public LdapAuthenticationResult doAuthenticate(Context context) {
return authenticate(context.getUsername(), context.getPassword());
}
/**
* Authenticate the user against LDAP servers until first success.
*
* @param login The login to use.
* @param password The password to use.
* @return false if specified user cannot be authenticated with specified password on any LDAP server
*/
private LdapAuthenticationResult authenticate(String login, String password) {
for (Map.Entry<String, LdapUserMapping> ldapEntry : userMappings.entrySet()) {
String ldapKey = ldapEntry.getKey();
LdapUserMapping ldapUserMapping = ldapEntry.getValue();
LdapContextFactory ldapContextFactory = contextFactories.get(ldapKey);
final String principal;
if (ldapContextFactory.isSasl()) {
principal = login;
} else {
SearchResult result = findUser(login, ldapKey, ldapUserMapping, ldapContextFactory);
if (result == null) {
continue;
}
principal = result.getNameInNamespace();
}
boolean passwordValid = isPasswordValid(password, ldapKey, ldapContextFactory, principal);
if (passwordValid) {
return LdapAuthenticationResult.success(ldapKey);
}
}
LOG.atDebug().log("User {} not found", getSanitizedLogin(login));
return LdapAuthenticationResult.failed();
}
private static SearchResult findUser(String login, String ldapKey, LdapUserMapping ldapUserMapping, LdapContextFactory ldapContextFactory) {
SearchResult result;
try {
result = ldapUserMapping.createSearch(ldapContextFactory, login).findUnique();
} catch (NamingException e) {
LOG.atDebug().log("User {} not found in server <{}>: {}", getSanitizedLogin(login), ldapKey, e.toString());
return null;
}
if (result == null) {
LOG.atDebug().log("User {} not found in <{}>", getSanitizedLogin(login), ldapKey);
return null;
}
return result;
}
private static String getSanitizedLogin(String login) {
Matcher matcher = SANITIZE_PATTERN.matcher(login);
return matcher.replaceAll("_");
}
private boolean isPasswordValid(String password, String ldapKey, LdapContextFactory ldapContextFactory, String principal) {
if (ldapContextFactory.isGssapi()) {
return checkPasswordUsingGssapi(principal, password, ldapKey);
}
return checkPasswordUsingBind(principal, password, ldapKey);
}
private boolean checkPasswordUsingBind(String principal, String password, String ldapKey) {
if (StringUtils.isEmpty(password)) {
LOG.debug("Password is blank.");
return false;
}
InitialDirContext context = null;
try {
context = contextFactories.get(ldapKey).createUserContext(principal, password);
return true;
} catch (NamingException e) {
LOG.debug("Password not valid for user {} in server {}: {}", principal, ldapKey, e.getMessage());
return false;
} finally {
ContextHelper.closeQuietly(context);
}
}
private boolean checkPasswordUsingGssapi(String principal, String password, String ldapKey) {
// Use our custom configuration to avoid reliance on external config
Configuration.setConfiguration(new Krb5LoginConfiguration());
LoginContext lc;
try {
lc = new LoginContext(getClass().getName(), new CallbackHandlerImpl(principal, password));
lc.login();
} catch (LoginException e) {
// Bad username: Client not found in Kerberos database
// Bad password: Integrity check on decrypted field failed
LOG.debug("Password not valid for {} in server {}: {}", principal, ldapKey, e.getMessage());
return false;
}
try {
lc.logout();
} catch (LoginException e) {
LOG.warn("Logout fails", e);
}
return true;
}
}
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