/*
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* Copyright 2012 John Crygier
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* Copyright 2012 gitblit.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit;
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import java.io.File;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.security.GeneralSecurityException;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.gitblit.models.TeamModel;
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import com.gitblit.models.UserModel;
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import com.gitblit.utils.ArrayUtils;
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import com.gitblit.utils.StringUtils;
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import com.unboundid.ldap.sdk.Attribute;
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import com.unboundid.ldap.sdk.LDAPConnection;
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import com.unboundid.ldap.sdk.LDAPException;
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import com.unboundid.ldap.sdk.LDAPSearchException;
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import com.unboundid.ldap.sdk.SearchResult;
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import com.unboundid.ldap.sdk.SearchResultEntry;
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import com.unboundid.ldap.sdk.SearchScope;
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import com.unboundid.util.ssl.SSLUtil;
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import com.unboundid.util.ssl.TrustAllTrustManager;
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/**
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* Implementation of an LDAP user service.
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*
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* @author John Crygier
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*/
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public class LdapUserService extends GitblitUserService {
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public static final Logger logger = LoggerFactory.getLogger(LdapUserService.class);
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private IStoredSettings settings;
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public LdapUserService() {
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super();
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}
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@Override
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public void setup(IStoredSettings settings) {
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this.settings = settings;
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String file = settings.getString(Keys.realm.ldap.backingUserService, "users.conf");
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File realmFile = GitBlit.getFileOrFolder(file);
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serviceImpl = createUserService(realmFile);
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logger.info("LDAP User Service backed by " + serviceImpl.toString());
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}
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private LDAPConnection getLdapConnection() {
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try {
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URI ldapUrl = new URI(settings.getRequiredString(Keys.realm.ldap.server));
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String bindUserName = settings.getString(Keys.realm.ldap.username, "");
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String bindPassword = settings.getString(Keys.realm.ldap.password, "");
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int ldapPort = ldapUrl.getPort();
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if (ldapUrl.getScheme().equalsIgnoreCase("ldaps")) { // SSL
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if (ldapPort == -1) // Default Port
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ldapPort = 636;
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SSLUtil sslUtil = new SSLUtil(new TrustAllTrustManager());
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return new LDAPConnection(sslUtil.createSSLSocketFactory(), ldapUrl.getHost(), ldapPort, bindUserName, bindPassword);
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} else {
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if (ldapPort == -1) // Default Port
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ldapPort = 389;
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return new LDAPConnection(ldapUrl.getHost(), ldapPort, bindUserName, bindPassword);
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}
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} catch (URISyntaxException e) {
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logger.error("Bad LDAP URL, should be in the form: ldap(s)://<server>:<port>", e);
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} catch (GeneralSecurityException e) {
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logger.error("Unable to create SSL Connection", e);
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} catch (LDAPException e) {
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logger.error("Error Connecting to LDAP", e);
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}
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return null;
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}
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/**
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* Credentials are defined in the LDAP server and can not be manipulated
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* from Gitblit.
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*
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* @return false
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* @since 1.0.0
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*/
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@Override
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public boolean supportsCredentialChanges() {
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return false;
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}
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/**
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* If no displayName pattern is defined then Gitblit can manage the display name.
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*
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* @return true if Gitblit can manage the user display name
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* @since 1.0.0
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*/
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@Override
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public boolean supportsDisplayNameChanges() {
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return StringUtils.isEmpty(settings.getString(Keys.realm.ldap.displayName, ""));
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}
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/**
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* If no email pattern is defined then Gitblit can manage the email address.
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*
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* @return true if Gitblit can manage the user email address
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* @since 1.0.0
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*/
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@Override
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public boolean supportsEmailAddressChanges() {
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return StringUtils.isEmpty(settings.getString(Keys.realm.ldap.email, ""));
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}
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/**
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* If the LDAP server will maintain team memberships then LdapUserService
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* will not allow team membership changes. In this scenario all team
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* changes must be made on the LDAP server by the LDAP administrator.
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*
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* @return true or false
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* @since 1.0.0
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*/
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public boolean supportsTeamMembershipChanges() {
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return !settings.getBoolean(Keys.realm.ldap.maintainTeams, false);
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}
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@Override
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public UserModel authenticate(String username, char[] password) {
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String simpleUsername = getSimpleUsername(username);
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LDAPConnection ldapConnection = getLdapConnection();
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if (ldapConnection != null) {
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// Find the logging in user's DN
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String accountBase = settings.getString(Keys.realm.ldap.accountBase, "");
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String accountPattern = settings.getString(Keys.realm.ldap.accountPattern, "(&(objectClass=person)(sAMAccountName=${username}))");
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accountPattern = StringUtils.replace(accountPattern, "${username}", escapeLDAPSearchFilter(simpleUsername));
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SearchResult result = doSearch(ldapConnection, accountBase, accountPattern);
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if (result != null && result.getEntryCount() == 1) {
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SearchResultEntry loggingInUser = result.getSearchEntries().get(0);
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String loggingInUserDN = loggingInUser.getDN();
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if (isAuthenticated(ldapConnection, loggingInUserDN, new String(password))) {
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logger.debug("LDAP authenticated: " + username);
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UserModel user = getUserModel(simpleUsername);
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if (user == null) // create user object for new authenticated user
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user = new UserModel(simpleUsername);
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// create a user cookie
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if (StringUtils.isEmpty(user.cookie) && !ArrayUtils.isEmpty(password)) {
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user.cookie = StringUtils.getSHA1(user.username + new String(password));
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}
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if (!supportsTeamMembershipChanges())
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getTeamsFromLdap(ldapConnection, simpleUsername, loggingInUser, user);
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// Get User Attributes
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setUserAttributes(user, loggingInUser);
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// Push the ldap looked up values to backing file
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super.updateUserModel(user);
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if (!supportsTeamMembershipChanges()) {
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for (TeamModel userTeam : user.teams)
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updateTeamModel(userTeam);
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}
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return user;
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}
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}
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}
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return null;
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}
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private void setAdminAttribute(UserModel user) {
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user.canAdmin = false;
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List<String> admins = settings.getStrings(Keys.realm.ldap.admins);
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for (String admin : admins) {
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if (admin.startsWith("@")) { // Team
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if (user.getTeam(admin.substring(1)) != null)
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user.canAdmin = true;
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} else
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if (user.getName().equalsIgnoreCase(admin))
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user.canAdmin = true;
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}
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}
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private void setUserAttributes(UserModel user, SearchResultEntry userEntry) {
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// Is this user an admin?
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setAdminAttribute(user);
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// Don't want visibility into the real password, make up a dummy
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user.password = "StoredInLDAP";
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// Get full name Attribute
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String displayName = settings.getString(Keys.realm.ldap.displayName, "");
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if (!StringUtils.isEmpty(displayName)) {
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// Replace embedded ${} with attributes
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if (displayName.contains("${")) {
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for (Attribute userAttribute : userEntry.getAttributes())
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displayName = StringUtils.replace(displayName, "${" + userAttribute.getName() + "}", userAttribute.getValue());
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user.displayName = displayName;
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} else {
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Attribute attribute = userEntry.getAttribute(displayName);
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if (attribute != null && attribute.hasValue()) {
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user.displayName = attribute.getValue();
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}
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}
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}
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// Get email address Attribute
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String email = settings.getString(Keys.realm.ldap.email, "");
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if (!StringUtils.isEmpty(email)) {
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if (email.contains("${")) {
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for (Attribute userAttribute : userEntry.getAttributes())
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email = StringUtils.replace(email, "${" + userAttribute.getName() + "}", userAttribute.getValue());
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user.emailAddress = email;
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} else {
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Attribute attribute = userEntry.getAttribute(email);
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if (attribute != null && attribute.hasValue()) {
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user.emailAddress = attribute.getValue();
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}
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}
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}
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}
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private void getTeamsFromLdap(LDAPConnection ldapConnection, String simpleUsername, SearchResultEntry loggingInUser, UserModel user) {
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String loggingInUserDN = loggingInUser.getDN();
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user.teams.clear(); // Clear the users team memberships - we're going to get them from LDAP
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String groupBase = settings.getString(Keys.realm.ldap.groupBase, "");
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String groupMemberPattern = settings.getString(Keys.realm.ldap.groupMemberPattern, "(&(objectClass=group)(member=${dn}))");
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groupMemberPattern = StringUtils.replace(groupMemberPattern, "${dn}", escapeLDAPSearchFilter(loggingInUserDN));
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groupMemberPattern = StringUtils.replace(groupMemberPattern, "${username}", escapeLDAPSearchFilter(simpleUsername));
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// Fill in attributes into groupMemberPattern
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for (Attribute userAttribute : loggingInUser.getAttributes())
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groupMemberPattern = StringUtils.replace(groupMemberPattern, "${" + userAttribute.getName() + "}", escapeLDAPSearchFilter(userAttribute.getValue()));
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SearchResult teamMembershipResult = doSearch(ldapConnection, groupBase, groupMemberPattern);
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if (teamMembershipResult != null && teamMembershipResult.getEntryCount() > 0) {
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for (int i = 0; i < teamMembershipResult.getEntryCount(); i++) {
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SearchResultEntry teamEntry = teamMembershipResult.getSearchEntries().get(i);
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String teamName = teamEntry.getAttribute("cn").getValue();
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TeamModel teamModel = getTeamModel(teamName);
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if (teamModel == null)
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teamModel = createTeamFromLdap(teamEntry);
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user.teams.add(teamModel);
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teamModel.addUser(user.getName());
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}
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}
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}
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private TeamModel createTeamFromLdap(SearchResultEntry teamEntry) {
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TeamModel answer = new TeamModel(teamEntry.getAttributeValue("cn"));
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// potentially retrieve other attributes here in the future
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return answer;
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}
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private SearchResult doSearch(LDAPConnection ldapConnection, String base, String filter) {
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try {
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return ldapConnection.search(base, SearchScope.SUB, filter);
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} catch (LDAPSearchException e) {
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logger.error("Problem Searching LDAP", e);
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return null;
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}
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}
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private boolean isAuthenticated(LDAPConnection ldapConnection, String userDn, String password) {
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try {
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// Binding will stop any LDAP-Injection Attacks since the searched-for user needs to bind to that DN
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ldapConnection.bind(userDn, password);
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return true;
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} catch (LDAPException e) {
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logger.error("Error authenticating user", e);
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return false;
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}
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}
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/**
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* Returns a simple username without any domain prefixes.
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*
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* @param username
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* @return a simple username
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*/
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protected String getSimpleUsername(String username) {
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int lastSlash = username.lastIndexOf('\\');
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if (lastSlash > -1) {
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username = username.substring(lastSlash + 1);
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}
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return username;
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}
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// From: https://www.owasp.org/index.php/Preventing_LDAP_Injection_in_Java
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public static final String escapeLDAPSearchFilter(String filter) {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < filter.length(); i++) {
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char curChar = filter.charAt(i);
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switch (curChar) {
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case '\\':
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sb.append("\\5c");
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break;
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case '*':
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sb.append("\\2a");
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break;
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case '(':
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sb.append("\\28");
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break;
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case ')':
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sb.append("\\29");
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break;
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case '\u0000':
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sb.append("\\00");
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break;
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default:
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sb.append(curChar);
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}
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}
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return sb.toString();
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}
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}
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