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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 com.google.common.base.Objects;
import com.google.common.base.Strings;
import com.google.gerrit.common.PageLinks;
import com.google.gerrit.httpd.HtmlDomUtil;
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.auth.AuthenticationUnavailableException;
import com.google.gerrit.server.config.CanonicalWebUrl;
import com.google.gwtexpui.server.CacheHeaders;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import java.io.IOException;
import javax.annotation.Nullable;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/** Handles username/password based authentication against the directory. */
@SuppressWarnings("serial")
@Singleton
class LdapLoginServlet extends HttpServlet {
private static final Logger log = LoggerFactory
.getLogger(LdapLoginServlet.class);
private final AccountManager accountManager;
private final Provider<WebSession> webSession;
private final Provider<String> urlProvider;
private final SiteHeaderFooter headers;
@Inject
LdapLoginServlet(AccountManager accountManager,
Provider<WebSession> webSession,
@CanonicalWebUrl @Nullable Provider<String> urlProvider,
SiteHeaderFooter headers) {
this.accountManager = accountManager;
this.webSession = webSession;
this.urlProvider = urlProvider;
this.headers = headers;
if (Strings.isNullOrEmpty(urlProvider.get())) {
log.error("gerrit.canonicalWebUrl must be set in gerrit.config");
}
}
private void sendForm(HttpServletRequest req, HttpServletResponse res,
@Nullable String errorMessage) throws IOException {
String self = req.getRequestURI();
String cancel = Objects.firstNonNull(urlProvider.get(), "/");
String token = getToken(req);
if (!token.equals("/")) {
cancel += "#" + token;
}
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");
res.setContentLength(bin.length);
ServletOutputStream out = res.getOutputStream();
try {
out.write(bin);
} finally {
out.close();
}
}
@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 {
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 (AccountException e) {
log.info(String.format("'%s' failed to sign in: %s", username, e.getMessage()));
sendForm(req, res, "Invalid username or password.");
return;
} catch (RuntimeException e) {
log.error("LDAP authentication failed", e);
sendForm(req, res, "Authentication unavailable at this time.");
return;
}
String token = getToken(req);
StringBuilder dest = new StringBuilder();
dest.append(urlProvider.get());
dest.append('#');
dest.append(token);
CacheHeaders.setNotCacheable(res);
webSession.get().login(ares, "1".equals(remember));
res.sendRedirect(dest.toString());
}
private static String getToken(final HttpServletRequest req) {
String token = req.getPathInfo();
if (token == null || token.isEmpty()) {
token = PageLinks.MINE;
} else if (!token.startsWith("/")) {
token = "/" + token;
}
return token;
}
}
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