780 lines
30 KiB
Java
780 lines
30 KiB
Java
/*
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* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.security.auth.module;
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import javax.security.auth.*;
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import javax.security.auth.callback.*;
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import javax.security.auth.login.*;
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import javax.security.auth.spi.*;
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import javax.naming.*;
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import javax.naming.directory.*;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Map;
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import java.util.LinkedList;
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import java.util.ResourceBundle;
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import com.sun.security.auth.UnixPrincipal;
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import com.sun.security.auth.UnixNumericUserPrincipal;
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import com.sun.security.auth.UnixNumericGroupPrincipal;
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/**
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* <p> The module prompts for a username and password
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* and then verifies the password against the password stored in
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* a directory service configured under JNDI.
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*
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* <p> This <code>LoginModule</code> interoperates with
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* any conformant JNDI service provider. To direct this
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* <code>LoginModule</code> to use a specific JNDI service provider,
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* two options must be specified in the login <code>Configuration</code>
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* for this <code>LoginModule</code>.
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* <pre>
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* user.provider.url=<b>name_service_url</b>
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* group.provider.url=<b>name_service_url</b>
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* </pre>
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*
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* <b>name_service_url</b> specifies
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* the directory service and path where this <code>LoginModule</code>
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* can access the relevant user and group information. Because this
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* <code>LoginModule</code> only performs one-level searches to
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* find the relevant user information, the <code>URL</code>
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* must point to a directory one level above where the user and group
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* information is stored in the directory service.
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* For example, to instruct this <code>LoginModule</code>
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* to contact a NIS server, the following URLs must be specified:
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* <pre>
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* user.provider.url="nis://<b>NISServerHostName</b>/<b>NISDomain</b>/user"
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* group.provider.url="nis://<b>NISServerHostName</b>/<b>NISDomain</b>/system/group"
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* </pre>
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*
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* <b>NISServerHostName</b> specifies the server host name of the
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* NIS server (for example, <i>nis.sun.com</i>, and <b>NISDomain</b>
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* specifies the domain for that NIS server (for example, <i>jaas.sun.com</i>.
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* To contact an LDAP server, the following URLs must be specified:
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* <pre>
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* user.provider.url="ldap://<b>LDAPServerHostName</b>/<b>LDAPName</b>"
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* group.provider.url="ldap://<b>LDAPServerHostName</b>/<b>LDAPName</b>"
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* </pre>
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*
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* <b>LDAPServerHostName</b> specifies the server host name of the
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* LDAP server, which may include a port number
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* (for example, <i>ldap.sun.com:389</i>),
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* and <b>LDAPName</b> specifies the entry name in the LDAP directory
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* (for example, <i>ou=People,o=Sun,c=US</i> and <i>ou=Groups,o=Sun,c=US</i>
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* for user and group information, respectively).
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*
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* <p> The format in which the user's information must be stored in
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* the directory service is specified in RFC 2307. Specifically,
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* this <code>LoginModule</code> will search for the user's entry in the
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* directory service using the user's <i>uid</i> attribute,
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* where <i>uid=<b>username</b></i>. If the search succeeds,
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* this <code>LoginModule</code> will then
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* obtain the user's encrypted password from the retrieved entry
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* using the <i>userPassword</i> attribute.
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* This <code>LoginModule</code> assumes that the password is stored
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* as a byte array, which when converted to a <code>String</code>,
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* has the following format:
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* <pre>
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* "{crypt}<b>encrypted_password</b>"
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* </pre>
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*
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* The LDAP directory server must be configured
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* to permit read access to the userPassword attribute.
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* If the user entered a valid username and password,
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* this <code>LoginModule</code> associates a
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* <code>UnixPrincipal</code>, <code>UnixNumericUserPrincipal</code>,
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* and the relevant UnixNumericGroupPrincipals with the
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* <code>Subject</code>.
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*
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* <p> This LoginModule also recognizes the following <code>Configuration</code>
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* options:
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* <pre>
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* debug if, true, debug messages are output to System.out.
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*
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* useFirstPass if, true, this LoginModule retrieves the
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* username and password from the module's shared state,
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* using "javax.security.auth.login.name" and
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* "javax.security.auth.login.password" as the respective
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* keys. The retrieved values are used for authentication.
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* If authentication fails, no attempt for a retry is made,
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* and the failure is reported back to the calling
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* application.
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*
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* tryFirstPass if, true, this LoginModule retrieves the
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* the username and password from the module's shared state,
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* using "javax.security.auth.login.name" and
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* "javax.security.auth.login.password" as the respective
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* keys. The retrieved values are used for authentication.
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* If authentication fails, the module uses the
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* CallbackHandler to retrieve a new username and password,
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* and another attempt to authenticate is made.
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* If the authentication fails, the failure is reported
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* back to the calling application.
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*
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* storePass if, true, this LoginModule stores the username and password
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* obtained from the CallbackHandler in the module's
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* shared state, using "javax.security.auth.login.name" and
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* "javax.security.auth.login.password" as the respective
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* keys. This is not performed if existing values already
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* exist for the username and password in the shared state,
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* or if authentication fails.
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*
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* clearPass if, true, this <code>LoginModule</code> clears the
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* username and password stored in the module's shared state
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* after both phases of authentication (login and commit)
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* have completed.
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* </pre>
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*
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*/
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@jdk.Exported
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public class JndiLoginModule implements LoginModule {
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private static final ResourceBundle rb = AccessController.doPrivileged(
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new PrivilegedAction<ResourceBundle>() {
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public ResourceBundle run() {
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return ResourceBundle.getBundle(
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"sun.security.util.AuthResources");
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}
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}
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);
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/** JNDI Provider */
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public final String USER_PROVIDER = "user.provider.url";
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public final String GROUP_PROVIDER = "group.provider.url";
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// configurable options
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private boolean debug = false;
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private boolean strongDebug = false;
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private String userProvider;
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private String groupProvider;
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private boolean useFirstPass = false;
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private boolean tryFirstPass = false;
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private boolean storePass = false;
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private boolean clearPass = false;
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// the authentication status
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private boolean succeeded = false;
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private boolean commitSucceeded = false;
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// username, password, and JNDI context
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private String username;
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private char[] password;
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DirContext ctx;
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// the user (assume it is a UnixPrincipal)
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private UnixPrincipal userPrincipal;
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private UnixNumericUserPrincipal UIDPrincipal;
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private UnixNumericGroupPrincipal GIDPrincipal;
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private LinkedList<UnixNumericGroupPrincipal> supplementaryGroups =
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new LinkedList<>();
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// initial state
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private Subject subject;
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private CallbackHandler callbackHandler;
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private Map<String, Object> sharedState;
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private Map<String, ?> options;
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private static final String CRYPT = "{crypt}";
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private static final String USER_PWD = "userPassword";
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private static final String USER_UID = "uidNumber";
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private static final String USER_GID = "gidNumber";
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private static final String GROUP_ID = "gidNumber";
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private static final String NAME = "javax.security.auth.login.name";
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private static final String PWD = "javax.security.auth.login.password";
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/**
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* Initialize this <code>LoginModule</code>.
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*
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* <p>
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*
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* @param subject the <code>Subject</code> to be authenticated. <p>
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*
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* @param callbackHandler a <code>CallbackHandler</code> for communicating
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* with the end user (prompting for usernames and
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* passwords, for example). <p>
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*
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* @param sharedState shared <code>LoginModule</code> state. <p>
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*
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* @param options options specified in the login
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* <code>Configuration</code> for this particular
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* <code>LoginModule</code>.
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*/
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// Unchecked warning from (Map<String, Object>)sharedState is safe
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// since javax.security.auth.login.LoginContext passes a raw HashMap.
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// Unchecked warnings from options.get(String) are safe since we are
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// passing known keys.
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@SuppressWarnings("unchecked")
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public void initialize(Subject subject, CallbackHandler callbackHandler,
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Map<String,?> sharedState,
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Map<String,?> options) {
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this.subject = subject;
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this.callbackHandler = callbackHandler;
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this.sharedState = (Map<String, Object>)sharedState;
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this.options = options;
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// initialize any configured options
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debug = "true".equalsIgnoreCase((String)options.get("debug"));
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strongDebug =
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"true".equalsIgnoreCase((String)options.get("strongDebug"));
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userProvider = (String)options.get(USER_PROVIDER);
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groupProvider = (String)options.get(GROUP_PROVIDER);
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tryFirstPass =
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"true".equalsIgnoreCase((String)options.get("tryFirstPass"));
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useFirstPass =
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"true".equalsIgnoreCase((String)options.get("useFirstPass"));
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storePass =
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"true".equalsIgnoreCase((String)options.get("storePass"));
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clearPass =
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"true".equalsIgnoreCase((String)options.get("clearPass"));
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}
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/**
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* <p> Prompt for username and password.
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* Verify the password against the relevant name service.
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*
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* <p>
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*
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* @return true always, since this <code>LoginModule</code>
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* should not be ignored.
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*
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* @exception FailedLoginException if the authentication fails. <p>
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*
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* @exception LoginException if this <code>LoginModule</code>
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* is unable to perform the authentication.
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*/
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public boolean login() throws LoginException {
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if (userProvider == null) {
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throw new LoginException
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("Error: Unable to locate JNDI user provider");
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}
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if (groupProvider == null) {
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throw new LoginException
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("Error: Unable to locate JNDI group provider");
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}
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] user provider: " +
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userProvider);
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System.out.println("\t\t[JndiLoginModule] group provider: " +
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groupProvider);
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}
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// attempt the authentication
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if (tryFirstPass) {
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try {
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// attempt the authentication by getting the
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// username and password from shared state
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attemptAuthentication(true);
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// authentication succeeded
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succeeded = true;
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"tryFirstPass succeeded");
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}
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return true;
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} catch (LoginException le) {
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// authentication failed -- try again below by prompting
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cleanState();
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"tryFirstPass failed with:" +
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le.toString());
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}
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}
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} else if (useFirstPass) {
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try {
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// attempt the authentication by getting the
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// username and password from shared state
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attemptAuthentication(true);
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// authentication succeeded
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succeeded = true;
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"useFirstPass succeeded");
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}
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return true;
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} catch (LoginException le) {
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// authentication failed
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cleanState();
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"useFirstPass failed");
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}
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throw le;
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}
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}
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// attempt the authentication by prompting for the username and pwd
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try {
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attemptAuthentication(false);
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// authentication succeeded
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succeeded = true;
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"regular authentication succeeded");
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}
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return true;
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} catch (LoginException le) {
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cleanState();
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if (debug) {
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System.out.println("\t\t[JndiLoginModule] " +
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"regular authentication failed");
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}
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throw le;
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}
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}
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/**
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* Abstract method to commit the authentication process (phase 2).
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*
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* <p> This method is called if the LoginContext's
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* overall authentication succeeded
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* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules
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* succeeded).
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*
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* <p> If this LoginModule's own authentication attempt
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* succeeded (checked by retrieving the private state saved by the
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* <code>login</code> method), then this method associates a
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* <code>UnixPrincipal</code>
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* with the <code>Subject</code> located in the
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* <code>LoginModule</code>. If this LoginModule's own
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* authentication attempted failed, then this method removes
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* any state that was originally saved.
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*
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* <p>
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*
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* @exception LoginException if the commit fails
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*
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* @return true if this LoginModule's own login and commit
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* attempts succeeded, or false otherwise.
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*/
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public boolean commit() throws LoginException {
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if (succeeded == false) {
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return false;
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} else {
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if (subject.isReadOnly()) {
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cleanState();
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throw new LoginException ("Subject is Readonly");
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}
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// add Principals to the Subject
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if (!subject.getPrincipals().contains(userPrincipal))
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subject.getPrincipals().add(userPrincipal);
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if (!subject.getPrincipals().contains(UIDPrincipal))
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subject.getPrincipals().add(UIDPrincipal);
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if (!subject.getPrincipals().contains(GIDPrincipal))
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subject.getPrincipals().add(GIDPrincipal);
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for (int i = 0; i < supplementaryGroups.size(); i++) {
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if (!subject.getPrincipals().contains
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(supplementaryGroups.get(i)))
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subject.getPrincipals().add(supplementaryGroups.get(i));
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}
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if (debug) {
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System.out.println("\t\t[JndiLoginModule]: " +
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"added UnixPrincipal,");
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System.out.println("\t\t\t\tUnixNumericUserPrincipal,");
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System.out.println("\t\t\t\tUnixNumericGroupPrincipal(s),");
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System.out.println("\t\t\t to Subject");
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}
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}
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// in any case, clean out state
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cleanState();
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commitSucceeded = true;
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return true;
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}
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/**
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* <p> This method is called if the LoginContext's
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* overall authentication failed.
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* (the relevant REQUIRED, REQUISITE, SUFFICIENT and OPTIONAL LoginModules
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* did not succeed).
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*
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* <p> If this LoginModule's own authentication attempt
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* succeeded (checked by retrieving the private state saved by the
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* <code>login</code> and <code>commit</code> methods),
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* then this method cleans up any state that was originally saved.
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*
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* <p>
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*
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* @exception LoginException if the abort fails.
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*
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* @return false if this LoginModule's own login and/or commit attempts
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* failed, and true otherwise.
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*/
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public boolean abort() throws LoginException {
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if (debug)
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System.out.println("\t\t[JndiLoginModule]: " +
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"aborted authentication failed");
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if (succeeded == false) {
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return false;
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} else if (succeeded == true && commitSucceeded == false) {
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// Clean out state
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succeeded = false;
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cleanState();
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userPrincipal = null;
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UIDPrincipal = null;
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GIDPrincipal = null;
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supplementaryGroups = new LinkedList<UnixNumericGroupPrincipal>();
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} else {
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// overall authentication succeeded and commit succeeded,
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// but someone else's commit failed
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logout();
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}
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return true;
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}
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/**
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* Logout a user.
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*
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* <p> This method removes the Principals
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* that were added by the <code>commit</code> method.
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*
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* <p>
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*
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* @exception LoginException if the logout fails.
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*
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* @return true in all cases since this <code>LoginModule</code>
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* should not be ignored.
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*/
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public boolean logout() throws LoginException {
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if (subject.isReadOnly()) {
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cleanState();
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throw new LoginException ("Subject is Readonly");
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}
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subject.getPrincipals().remove(userPrincipal);
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subject.getPrincipals().remove(UIDPrincipal);
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subject.getPrincipals().remove(GIDPrincipal);
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for (int i = 0; i < supplementaryGroups.size(); i++) {
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subject.getPrincipals().remove(supplementaryGroups.get(i));
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}
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// clean out state
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cleanState();
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succeeded = false;
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commitSucceeded = false;
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userPrincipal = null;
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UIDPrincipal = null;
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GIDPrincipal = null;
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supplementaryGroups = new LinkedList<UnixNumericGroupPrincipal>();
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if (debug) {
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System.out.println("\t\t[JndiLoginModule]: " +
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"logged out Subject");
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}
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return true;
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}
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/**
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* Attempt authentication
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*
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* <p>
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*
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* @param getPasswdFromSharedState boolean that tells this method whether
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* to retrieve the password from the sharedState.
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*/
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private void attemptAuthentication(boolean getPasswdFromSharedState)
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throws LoginException {
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String encryptedPassword = null;
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// first get the username and password
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getUsernamePassword(getPasswdFromSharedState);
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try {
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// get the user's passwd entry from the user provider URL
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InitialContext iCtx = new InitialContext();
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ctx = (DirContext)iCtx.lookup(userProvider);
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/*
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SearchControls controls = new SearchControls
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(SearchControls.ONELEVEL_SCOPE,
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0,
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5000,
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new String[] { USER_PWD },
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false,
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false);
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*/
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SearchControls controls = new SearchControls();
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NamingEnumeration<SearchResult> ne = ctx.search("",
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"(uid=" + username + ")",
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controls);
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if (ne.hasMore()) {
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SearchResult result = ne.next();
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Attributes attributes = result.getAttributes();
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// get the password
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// this module works only if the LDAP directory server
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// is configured to permit read access to the userPassword
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// attribute. The directory administrator need to grant
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// this access.
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//
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// A workaround would be to make the server do authentication
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// by setting the Context.SECURITY_PRINCIPAL
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// and Context.SECURITY_CREDENTIALS property.
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// However, this would make it not work with systems that
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// don't do authentication at the server (like NIS).
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//
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// Setting the SECURITY_* properties and using "simple"
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// authentication for LDAP is recommended only for secure
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// channels. For nonsecure channels, SSL is recommended.
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Attribute pwd = attributes.get(USER_PWD);
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String encryptedPwd = new String((byte[])pwd.get(), "UTF8");
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encryptedPassword = encryptedPwd.substring(CRYPT.length());
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// check the password
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if (verifyPassword
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(encryptedPassword, new String(password)) == true) {
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// authentication succeeded
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if (debug)
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System.out.println("\t\t[JndiLoginModule] " +
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"attemptAuthentication() succeeded");
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} else {
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// authentication failed
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if (debug)
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System.out.println("\t\t[JndiLoginModule] " +
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"attemptAuthentication() failed");
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throw new FailedLoginException("Login incorrect");
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}
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// save input as shared state only if
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// authentication succeeded
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if (storePass &&
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!sharedState.containsKey(NAME) &&
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!sharedState.containsKey(PWD)) {
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sharedState.put(NAME, username);
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sharedState.put(PWD, password);
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}
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// create the user principal
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userPrincipal = new UnixPrincipal(username);
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// get the UID
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Attribute uid = attributes.get(USER_UID);
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String uidNumber = (String)uid.get();
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UIDPrincipal = new UnixNumericUserPrincipal(uidNumber);
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if (debug && uidNumber != null) {
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System.out.println("\t\t[JndiLoginModule] " +
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"user: '" + username + "' has UID: " +
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uidNumber);
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}
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// get the GID
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Attribute gid = attributes.get(USER_GID);
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String gidNumber = (String)gid.get();
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GIDPrincipal = new UnixNumericGroupPrincipal
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(gidNumber, true);
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if (debug && gidNumber != null) {
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System.out.println("\t\t[JndiLoginModule] " +
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"user: '" + username + "' has GID: " +
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gidNumber);
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}
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// get the supplementary groups from the group provider URL
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ctx = (DirContext)iCtx.lookup(groupProvider);
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ne = ctx.search("", new BasicAttributes("memberUid", username));
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while (ne.hasMore()) {
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result = ne.next();
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attributes = result.getAttributes();
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gid = attributes.get(GROUP_ID);
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String suppGid = (String)gid.get();
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if (!gidNumber.equals(suppGid)) {
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UnixNumericGroupPrincipal suppPrincipal =
|
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new UnixNumericGroupPrincipal(suppGid, false);
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supplementaryGroups.add(suppPrincipal);
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if (debug && suppGid != null) {
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System.out.println("\t\t[JndiLoginModule] " +
|
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"user: '" + username +
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"' has Supplementary Group: " +
|
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suppGid);
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}
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}
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}
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|
|
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} else {
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// bad username
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|
if (debug) {
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System.out.println("\t\t[JndiLoginModule]: User not found");
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}
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throw new FailedLoginException("User not found");
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}
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} catch (NamingException ne) {
|
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// bad username
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|
if (debug) {
|
|
System.out.println("\t\t[JndiLoginModule]: User not found");
|
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ne.printStackTrace();
|
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}
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throw new FailedLoginException("User not found");
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} catch (java.io.UnsupportedEncodingException uee) {
|
|
// password stored in incorrect format
|
|
if (debug) {
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|
System.out.println("\t\t[JndiLoginModule]: " +
|
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"password incorrectly encoded");
|
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uee.printStackTrace();
|
|
}
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throw new LoginException("Login failure due to incorrect " +
|
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"password encoding in the password database");
|
|
}
|
|
|
|
// authentication succeeded
|
|
}
|
|
|
|
/**
|
|
* Get the username and password.
|
|
* This method does not return any value.
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|
* Instead, it sets global name and password variables.
|
|
*
|
|
* <p> Also note that this method will set the username and password
|
|
* values in the shared state in case subsequent LoginModules
|
|
* want to use them via use/tryFirstPass.
|
|
*
|
|
* <p>
|
|
*
|
|
* @param getPasswdFromSharedState boolean that tells this method whether
|
|
* to retrieve the password from the sharedState.
|
|
*/
|
|
private void getUsernamePassword(boolean getPasswdFromSharedState)
|
|
throws LoginException {
|
|
|
|
if (getPasswdFromSharedState) {
|
|
// use the password saved by the first module in the stack
|
|
username = (String)sharedState.get(NAME);
|
|
password = (char[])sharedState.get(PWD);
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|
return;
|
|
}
|
|
|
|
// prompt for a username and password
|
|
if (callbackHandler == null)
|
|
throw new LoginException("Error: no CallbackHandler available " +
|
|
"to garner authentication information from the user");
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|
|
String protocol = userProvider.substring(0, userProvider.indexOf(":"));
|
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|
|
Callback[] callbacks = new Callback[2];
|
|
callbacks[0] = new NameCallback(protocol + " "
|
|
+ rb.getString("username."));
|
|
callbacks[1] = new PasswordCallback(protocol + " " +
|
|
rb.getString("password."),
|
|
false);
|
|
|
|
try {
|
|
callbackHandler.handle(callbacks);
|
|
username = ((NameCallback)callbacks[0]).getName();
|
|
char[] tmpPassword = ((PasswordCallback)callbacks[1]).getPassword();
|
|
password = new char[tmpPassword.length];
|
|
System.arraycopy(tmpPassword, 0,
|
|
password, 0, tmpPassword.length);
|
|
((PasswordCallback)callbacks[1]).clearPassword();
|
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|
|
} catch (java.io.IOException ioe) {
|
|
throw new LoginException(ioe.toString());
|
|
} catch (UnsupportedCallbackException uce) {
|
|
throw new LoginException("Error: " + uce.getCallback().toString() +
|
|
" not available to garner authentication information " +
|
|
"from the user");
|
|
}
|
|
|
|
// print debugging information
|
|
if (strongDebug) {
|
|
System.out.println("\t\t[JndiLoginModule] " +
|
|
"user entered username: " +
|
|
username);
|
|
System.out.print("\t\t[JndiLoginModule] " +
|
|
"user entered password: ");
|
|
for (int i = 0; i < password.length; i++)
|
|
System.out.print(password[i]);
|
|
System.out.println();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verify a password against the encrypted passwd from /etc/shadow
|
|
*/
|
|
private boolean verifyPassword(String encryptedPassword, String password) {
|
|
|
|
if (encryptedPassword == null)
|
|
return false;
|
|
|
|
Crypt c = new Crypt();
|
|
try {
|
|
byte oldCrypt[] = encryptedPassword.getBytes("UTF8");
|
|
byte newCrypt[] = c.crypt(password.getBytes("UTF8"),
|
|
oldCrypt);
|
|
if (newCrypt.length != oldCrypt.length)
|
|
return false;
|
|
for (int i = 0; i < newCrypt.length; i++) {
|
|
if (oldCrypt[i] != newCrypt[i])
|
|
return false;
|
|
}
|
|
} catch (java.io.UnsupportedEncodingException uee) {
|
|
// cannot happen, but return false just to be safe
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Clean out state because of a failed authentication attempt
|
|
*/
|
|
private void cleanState() {
|
|
username = null;
|
|
if (password != null) {
|
|
for (int i = 0; i < password.length; i++)
|
|
password[i] = ' ';
|
|
password = null;
|
|
}
|
|
ctx = null;
|
|
|
|
if (clearPass) {
|
|
sharedState.remove(NAME);
|
|
sharedState.remove(PWD);
|
|
}
|
|
}
|
|
}
|