| // Copyright (C) 2012 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; |
| |
| import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Strings; |
| import com.google.gerrit.extensions.registration.DynamicItem; |
| import com.google.gerrit.server.AccessPath; |
| import com.google.gerrit.server.account.AccountCache; |
| import com.google.gerrit.server.account.AccountException; |
| import com.google.gerrit.server.account.AccountManager; |
| import com.google.gerrit.server.account.AccountState; |
| 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.NoSuchUserException; |
| import com.google.gerrit.server.config.AuthConfig; |
| import com.google.inject.Inject; |
| import com.google.inject.Singleton; |
| |
| import org.apache.commons.codec.binary.Base64; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Locale; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.http.HttpServletResponseWrapper; |
| |
| /** |
| * Authenticates the current user by HTTP basic authentication. |
| * <p> |
| * The current HTTP request is authenticated by looking up the username and |
| * password from the Base64 encoded Authorization header and validating them |
| * against any username/password configured authentication system in Gerrit. |
| * This filter is intended only to protect the {@link GitOverHttpServlet} and |
| * its handled URLs, which provide remote repository access over HTTP. |
| * |
| * @see <a href="http://www.ietf.org/rfc/rfc2617.txt">RFC 2617</a> |
| */ |
| @Singleton |
| class ProjectBasicAuthFilter implements Filter { |
| private static final Logger log = LoggerFactory |
| .getLogger(ProjectBasicAuthFilter.class); |
| |
| public static final String REALM_NAME = "Gerrit Code Review"; |
| private static final String AUTHORIZATION = "Authorization"; |
| private static final String LIT_BASIC = "Basic "; |
| |
| private final DynamicItem<WebSession> session; |
| private final AccountCache accountCache; |
| private final AccountManager accountManager; |
| private final AuthConfig authConfig; |
| |
| @Inject |
| ProjectBasicAuthFilter(DynamicItem<WebSession> session, |
| AccountCache accountCache, AccountManager accountManager, |
| AuthConfig authConfig) { |
| this.session = session; |
| this.accountCache = accountCache; |
| this.accountManager = accountManager; |
| this.authConfig = authConfig; |
| } |
| |
| @Override |
| public void init(FilterConfig config) { |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, |
| FilterChain chain) throws IOException, ServletException { |
| HttpServletRequest req = (HttpServletRequest) request; |
| Response rsp = new Response((HttpServletResponse) response); |
| |
| if (verify(req, rsp)) { |
| chain.doFilter(req, rsp); |
| } |
| } |
| |
| private boolean verify(HttpServletRequest req, Response rsp) |
| throws IOException { |
| final String hdr = req.getHeader(AUTHORIZATION); |
| if (hdr == null || !hdr.startsWith(LIT_BASIC)) { |
| // Allow an anonymous connection through, or it might be using a |
| // session cookie instead of basic authentication. |
| return true; |
| } |
| |
| final byte[] decoded = |
| Base64.decodeBase64(hdr.substring(LIT_BASIC.length())); |
| String usernamePassword = new String(decoded, encoding(req)); |
| int splitPos = usernamePassword.indexOf(':'); |
| if (splitPos < 1) { |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| |
| String username = usernamePassword.substring(0, splitPos); |
| String password = usernamePassword.substring(splitPos + 1); |
| if (Strings.isNullOrEmpty(password)) { |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| if (authConfig.isUserNameToLowerCase()) { |
| username = username.toLowerCase(Locale.US); |
| } |
| |
| final AccountState who = accountCache.getByUsername(username); |
| if (who == null || !who.getAccount().isActive()) { |
| log.warn("Authentication failed for " + username |
| + ": account inactive or not provisioned in Gerrit"); |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| |
| if (!authConfig.isLdapAuthType() |
| && !passwordMatchesTheUserGeneratedOne(who, username, password)) { |
| log.warn("Authentication failed for " + username |
| + ": password does not match the one stored in Gerrit"); |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| |
| AuthRequest whoAuth = AuthRequest.forUser(username); |
| whoAuth.setPassword(password); |
| |
| try { |
| AuthResult whoAuthResult = accountManager.authenticate(whoAuth); |
| WebSession ws = session.get(); |
| ws.setUserAccountId(whoAuthResult.getAccountId()); |
| ws.setAccessPathOk(AccessPath.GIT, true); |
| ws.setAccessPathOk(AccessPath.REST_API, true); |
| return true; |
| } catch (NoSuchUserException e) { |
| if (password.equals(who.getPassword(who.getUserName()))) { |
| WebSession ws = session.get(); |
| ws.setUserAccountId(who.getAccount().getId()); |
| ws.setAccessPathOk(AccessPath.GIT, true); |
| ws.setAccessPathOk(AccessPath.REST_API, true); |
| return true; |
| } else { |
| log.warn("Authentication failed for " + username, e); |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| } catch (AuthenticationFailedException e) { |
| log.warn("Authentication failed for " + username + ": " + e.getMessage()); |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } catch (AccountException e) { |
| log.warn("Authentication failed for " + username, e); |
| rsp.sendError(SC_UNAUTHORIZED); |
| return false; |
| } |
| } |
| |
| private boolean passwordMatchesTheUserGeneratedOne(AccountState who, |
| String username, String password) { |
| String accountPassword = who.getPassword(username); |
| return accountPassword != null && password != null |
| && accountPassword.equals(password); |
| } |
| |
| private String encoding(HttpServletRequest req) { |
| return MoreObjects.firstNonNull(req.getCharacterEncoding(), "UTF-8"); |
| } |
| |
| static class Response extends HttpServletResponseWrapper { |
| private static final String WWW_AUTHENTICATE = "WWW-Authenticate"; |
| |
| Response(HttpServletResponse rsp) { |
| super(rsp); |
| } |
| |
| private void status(int sc) { |
| if (sc == SC_UNAUTHORIZED) { |
| StringBuilder v = new StringBuilder(); |
| v.append(LIT_BASIC); |
| v.append("realm=\"").append(REALM_NAME).append("\""); |
| setHeader(WWW_AUTHENTICATE, v.toString()); |
| } else if (containsHeader(WWW_AUTHENTICATE)) { |
| setHeader(WWW_AUTHENTICATE, null); |
| } |
| } |
| |
| @Override |
| public void sendError(int sc, String msg) throws IOException { |
| status(sc); |
| super.sendError(sc, msg); |
| } |
| |
| @Override |
| public void sendError(int sc) throws IOException { |
| status(sc); |
| super.sendError(sc); |
| } |
| |
| @Override |
| @Deprecated |
| public void setStatus(int sc, String sm) { |
| status(sc); |
| super.setStatus(sc, sm); |
| } |
| |
| @Override |
| public void setStatus(int sc) { |
| status(sc); |
| super.setStatus(sc); |
| } |
| } |
| } |