/*
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* Copyright 2013 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.auth;
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import java.io.File;
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import org.jvnet.libpam.PAM;
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import org.jvnet.libpam.PAMException;
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import org.jvnet.libpam.impl.CLibrary;
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import com.gitblit.Constants;
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import com.gitblit.Constants.AccountType;
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import com.gitblit.Keys;
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import com.gitblit.auth.AuthenticationProvider.UsernamePasswordAuthenticationProvider;
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import com.gitblit.models.UserModel;
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/**
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* Implementation of PAM authentication for Linux/Unix/MacOSX.
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*
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* @author James Moger
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*/
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public class PAMAuthProvider extends UsernamePasswordAuthenticationProvider {
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public PAMAuthProvider() {
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super("pam");
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}
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@Override
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public void setup() {
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// Try to identify the passwd database
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String [] files = { "/etc/shadow", "/etc/master.passwd" };
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File passwdFile = null;
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for (String name : files) {
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File f = new File(name);
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if (f.exists()) {
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passwdFile = f;
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break;
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}
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}
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if (passwdFile == null) {
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logger.error("PAM Authentication could not find a passwd database!");
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} else if (!passwdFile.canRead()) {
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logger.error("PAM Authentication can not read passwd database {}! PAM authentications may fail!", passwdFile);
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}
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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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@Override
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public boolean supportsDisplayNameChanges() {
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return true;
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}
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@Override
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public boolean supportsEmailAddressChanges() {
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return true;
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}
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@Override
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public boolean supportsTeamMembershipChanges() {
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return true;
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}
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@Override
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public AccountType getAccountType() {
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return AccountType.PAM;
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}
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@Override
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public UserModel authenticate(String username, char[] password) {
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if (CLibrary.libc.getpwnam(username) == null) {
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logger.warn("Can not get PAM passwd for " + username);
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return null;
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}
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PAM pam = null;
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try {
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String serviceName = settings.getString(Keys.realm.pam.serviceName, "system-auth");
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pam = new PAM(serviceName);
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pam.authenticate(username, new String(password));
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} catch (PAMException e) {
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logger.error(e.getMessage());
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return null;
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} finally {
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pam.dispose();
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}
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UserModel user = userManager.getUserModel(username);
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if (user == null) {
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// create user object for new authenticated user
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user = new UserModel(username.toLowerCase());
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}
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// create a user cookie
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setCookie(user, password);
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// update user attributes from UnixUser
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user.accountType = getAccountType();
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user.password = Constants.EXTERNAL_ACCOUNT;
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// TODO consider mapping PAM groups to teams
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// push the changes to the backing user service
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updateUser(user);
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return user;
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}
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}
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