/**
* Licensed to Jasig under one or more contributor license
* agreements. See the NOTICE file distributed with this work
* for additional information regarding copyright ownership.
* Jasig licenses this file to you 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 org.jasig.portal.security.provider;
import java.util.Properties;
import javax.naming.AuthenticationException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import org.jasig.portal.ldap.LdapServices;
import org.jasig.portal.ldap.ILdapServer;
import org.jasig.portal.security.IConfigurableSecurityContext;
import org.jasig.portal.security.PortalSecurityException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <p>This is an implementation of a SecurityContext that checks a user's
* credentials against an LDAP directory. It expects to be able to bind
* to the LDAP directory as the user so that it can authenticate the
* user.</p>
* <p>
* By implementing the {@link org.jasig.portal.security.IConfigurableSecurityContext}
* interface this context may have properties set on it. The one property
* the <code>SimpleLdapSecurityContext</code> looks for is defined by
* the String {@link #LDAP_PROPERTIES_CONNECTION_NAME} "connection".
* This property allows a specific, named, LDAP connection to be used by
* the context. If no "connection" property is specified the default
* LDAP connection returned by {@link org.jasig.portal.ldap.LdapServices} is
* used.
* </p>
*
* @author Russell Tokuyama (University of Hawaii)
* @version $Revision$
*/
public class SimpleLdapSecurityContext extends ChainingSecurityContext implements IConfigurableSecurityContext {
private final Logger log = LoggerFactory.getLogger(this.getClass());
// Attributes that we're interested in.
public static final int ATTR_UID = 0;
public static final int ATTR_FIRSTNAME = ATTR_UID + 1;
public static final int ATTR_LASTNAME = ATTR_FIRSTNAME + 1;
private final int SIMPLE_LDAP_SECURITYAUTHTYPE = 0xFF04;
private static final String[] attributes = {
"uid", // user ID
"givenName", // first name
"sn" // last name
};
public static final String LDAP_PROPERTIES_CONNECTION_NAME = "connection";
private Properties ctxProperties;
SimpleLdapSecurityContext() {
super();
ctxProperties = new Properties();
}
/**
* Sets the properties to use for this security context.
*
* @see org.jasig.portal.security.IConfigurableSecurityContext#setProperties(java.util.Properties)
*/
public void setProperties(Properties props) {
ctxProperties = props;
}
/**
* Returns the type of authentication this class provides.
*
* @return authorization type
*/
public int getAuthType() {
/*
* What is this for? No one would know what to do with the
* value returned. Subclasses might know but our getAuthType()
* doesn't return anything easily useful.
*/
return this.SIMPLE_LDAP_SECURITYAUTHTYPE;
}
/**
* Authenticates the user.
*/
public synchronized void authenticate() throws PortalSecurityException {
this.isauth = false;
ILdapServer ldapConn;
String propFile = ctxProperties.getProperty(LDAP_PROPERTIES_CONNECTION_NAME);
if (propFile != null && propFile.length() > 0)
ldapConn = LdapServices.getLdapServer(propFile);
else
ldapConn = LdapServices.getDefaultLdapServer();
String creds = new String(this.myOpaqueCredentials.credentialstring);
if (this.myPrincipal.UID != null && !this.myPrincipal.UID.trim().equals("")
&& this.myOpaqueCredentials.credentialstring != null && !creds.trim().equals("")) {
DirContext conn = null;
NamingEnumeration results = null;
StringBuffer user = new StringBuffer("(");
String first_name = null;
String last_name = null;
user.append(ldapConn.getUidAttribute()).append("=");
user.append(this.myPrincipal.UID).append(")");
log.debug("SimpleLdapSecurityContext: Looking for {}", user.toString());
try {
conn = ldapConn.getConnection();
// set up search controls
SearchControls searchCtls = new SearchControls();
searchCtls.setReturningAttributes(attributes);
searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
// do lookup
if (conn != null) {
try {
results = conn.search(ldapConn.getBaseDN(), user.toString(), searchCtls);
if (results != null) {
if (!results.hasMore()) {
log.error("SimpleLdapSecurityContext: user not found: {}", this.myPrincipal.UID);
}
while (results != null && results.hasMore()) {
SearchResult entry = (SearchResult) results.next();
StringBuffer dnBuffer = new StringBuffer();
dnBuffer.append(entry.getName()).append(", ");
dnBuffer.append(ldapConn.getBaseDN());
Attributes attrs = entry.getAttributes();
first_name = getAttributeValue(attrs, ATTR_FIRSTNAME);
last_name = getAttributeValue(attrs, ATTR_LASTNAME);
// re-bind as user
conn.removeFromEnvironment(javax.naming.Context.SECURITY_PRINCIPAL);
conn.removeFromEnvironment(javax.naming.Context.SECURITY_CREDENTIALS);
conn.addToEnvironment(javax.naming.Context.SECURITY_PRINCIPAL, dnBuffer.toString());
conn.addToEnvironment(javax.naming.Context.SECURITY_CREDENTIALS, this.myOpaqueCredentials.credentialstring);
searchCtls = new SearchControls();
searchCtls.setReturningAttributes(new String[0]);
searchCtls.setSearchScope(SearchControls.OBJECT_SCOPE);
String attrSearch = "(" + ldapConn.getUidAttribute() + "=*)";
log.debug("SimpleLdapSecurityContext: Looking in {} for {}", dnBuffer.toString(), attrSearch);
conn.search(dnBuffer.toString(), attrSearch, searchCtls);
this.isauth = true;
this.myPrincipal.FullName = first_name + " " + last_name;
log.debug("SimpleLdapSecurityContext: User {} ({}) is authenticated",
this.myPrincipal.UID, this.myPrincipal.FullName);
// Since LDAP is case-insensitive with respect to uid, force
// user name to lower case for use by the portal
this.myPrincipal.UID = this.myPrincipal.UID.toLowerCase();
} // while (results != null && results.hasMore())
} else {
log.error("SimpleLdapSecurityContext: No such user: {}", this.myPrincipal.UID);
}
} catch (AuthenticationException ae) {
log.info("SimpleLdapSecurityContext: Password invalid for user: " + this.myPrincipal.UID);
} catch (Exception e) {
log.error("SimpleLdapSecurityContext: LDAP Error with user: " + this.myPrincipal.UID + "; ", e);
throw new PortalSecurityException("SimpleLdapSecurityContext: LDAP Error" + e
+ " with user: " + this.myPrincipal.UID);
} finally {
ldapConn.releaseConnection(conn);
}
} else {
log.error("LDAP Server Connection unavailable");
}
} catch (final NamingException ne) {
log.error("Error getting connection to LDAP server.", ne);
}
} else {
// If the principal and/or credential are missing, the context authentication
// simply fails. It should not be construed that this is an error. It happens for guest access.
log.info("Principal or OpaqueCredentials not initialized prior to authenticate");
}
// Ok...we are now ready to authenticate all of our subcontexts.
super.authenticate();
return;
}
/*--------------------- Helper methods ---------------------*/
/**
* <p>Return a single value of an attribute from possibly multiple values,
* grossly ignoring anything else. If there are no values, then
* return an empty string.</p>
*
* @param attrs LDAP query results
* @param attribute LDAP attribute we are interested in
* @return a single value of the attribute
*/
private String getAttributeValue(Attributes attrs, int attribute) throws NamingException {
NamingEnumeration values = null;
String aValue = "";
if (!isAttribute(attribute))
return aValue;
Attribute attrib = attrs.get(attributes[attribute]);
if (attrib != null) {
for (values = attrib.getAll(); values.hasMoreElements(); ) {
aValue = (String) values.nextElement();
break; // take only the first attribute value
}
}
return aValue;
}
/**
* Is this a value attribute that's been requested?
*
* @param attribute in question
*/
private boolean isAttribute(int attribute) {
if (attribute < ATTR_UID || attribute > ATTR_LASTNAME) {
return false;
}
return true;
}
}