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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.httpd.auth.ldap;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.MoreObjects;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.registration.DynamicItem;
import com.google.gerrit.httpd.CanonicalWebUrl;
import com.google.gerrit.httpd.HtmlDomUtil;
import com.google.gerrit.httpd.LoginUrlToken;
import com.google.gerrit.httpd.WebSession;
import com.google.gerrit.httpd.template.SiteHeaderFooter;
import com.google.gerrit.server.account.AccountException;
import com.google.gerrit.server.account.AccountManager;
import com.google.gerrit.server.account.AccountUserNameException;
import com.google.gerrit.server.account.AuthRequest;
import com.google.gerrit.server.account.AuthResult;
import com.google.gerrit.server.account.AuthenticationFailedException;
import com.google.gerrit.server.auth.AuthenticationUnavailableException;
import com.google.gerrit.util.http.CacheHeaders;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/** Handles username/password based authentication against the directory. */
@Singleton
class LdapLoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private final AccountManager accountManager;
private final DynamicItem<WebSession> webSession;
private final CanonicalWebUrl urlProvider;
private final SiteHeaderFooter headers;
@Inject
LdapLoginServlet(
AccountManager accountManager,
DynamicItem<WebSession> webSession,
CanonicalWebUrl urlProvider,
SiteHeaderFooter headers) {
this.accountManager = accountManager;
this.webSession = webSession;
this.urlProvider = urlProvider;
this.headers = headers;
}
private void sendForm(
HttpServletRequest req, HttpServletResponse res, @Nullable String errorMessage)
throws IOException {
String self = req.getRequestURI();
String cancel = MoreObjects.firstNonNull(urlProvider.get(req), "/");
cancel += LoginUrlToken.getToken(req);
Document doc = headers.parse(LdapLoginServlet.class, "LoginForm.html");
HtmlDomUtil.find(doc, "hostName").setTextContent(req.getServerName());
HtmlDomUtil.find(doc, "login_form").setAttribute("action", self);
HtmlDomUtil.find(doc, "cancel_link").setAttribute("href", cancel);
Element emsg = HtmlDomUtil.find(doc, "error_message");
if (Strings.isNullOrEmpty(errorMessage)) {
emsg.getParentNode().removeChild(emsg);
} else {
emsg.setTextContent(errorMessage);
}
byte[] bin = HtmlDomUtil.toUTF8(doc);
res.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
res.setContentType("text/html");
res.setCharacterEncoding(UTF_8.name());
res.setContentLength(bin.length);
try (ServletOutputStream out = res.getOutputStream()) {
out.write(bin);
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
sendForm(req, res, null);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
req.setCharacterEncoding(UTF_8.name());
String username = Strings.nullToEmpty(req.getParameter("username")).trim();
String password = Strings.nullToEmpty(req.getParameter("password"));
String remember = Strings.nullToEmpty(req.getParameter("rememberme"));
if (username.isEmpty() || password.isEmpty()) {
sendForm(req, res, "Invalid username or password.");
return;
}
AuthRequest areq = AuthRequest.forUser(username);
areq.setPassword(password);
AuthResult ares;
try {
ares = accountManager.authenticate(areq);
} catch (AccountUserNameException e) {
sendForm(req, res, e.getMessage());
return;
} catch (AuthenticationUnavailableException e) {
sendForm(req, res, "Authentication unavailable at this time.");
return;
} catch (AuthenticationFailedException e) {
// This exception is thrown if the user provided wrong credentials, we don't need to log a
// stacktrace for it.
logger.atWarning().log("'%s' failed to sign in: %s", username, e.getMessage());
sendForm(req, res, "Invalid username or password.");
return;
} catch (AccountException e) {
logger.atWarning().withCause(e).log("'%s' failed to sign in", username);
sendForm(req, res, "Authentication failed.");
return;
} catch (RuntimeException e) {
logger.atSevere().withCause(e).log("LDAP authentication failed");
sendForm(req, res, "Authentication unavailable at this time.");
return;
}
StringBuilder dest = new StringBuilder();
dest.append(urlProvider.get(req));
dest.append(LoginUrlToken.getToken(req));
CacheHeaders.setNotCacheable(res);
webSession.get().login(ares, "1".equals(remember));
res.sendRedirect(dest.toString());
}
}
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