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