George2: Created page with " package ldaptest; import java.util.Hashtable; import javax.naming.Context; import javax.naming.NamingEnumeration; import javax.naming.NamingException; i..."

2015-04-14T12:13:06Z

Created page with "<source lang="java"> package ldaptest; import java.util.Hashtable; import javax.naming.Context; import javax.naming.NamingEnumeration; import javax.naming.NamingException; i..."

New page

<source lang="java">

package ldaptest;

import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.InitialLdapContext;
import javax.naming.ldap.LdapContext;

/**
* Example code for retrieving a Users Primary Group
* from Microsoft Active Directory via. its LDAP API
*
* @author Adam Retter <adam.retter@googlemail.com>
*/
public class LDAPTest {

/**
* @param args the command line arguments
*/
public static void main(String[] args) throws NamingException {

final String ldapAdServer = "ldap://ad.your-server.com:389";
final String ldapSearchBase = "dc=ad,dc=my-domain,dc=com";

final String ldapUsername = "myLdapUsername";
final String ldapPassword = "myLdapPassword";

final String ldapAccountToLookup = "myOtherLdapUsername";

Hashtable<String, Object> env = new Hashtable<String, Object>();
env.put(Context.SECURITY_AUTHENTICATION, "simple");
if(ldapUsername != null) {
env.put(Context.SECURITY_PRINCIPAL, ldapUsername);
}
if(ldapPassword != null) {
env.put(Context.SECURITY_CREDENTIALS, ldapPassword);
}
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, ldapAdServer);

//ensures that objectSID attribute values
//will be returned as a byte[] instead of a String
env.put("java.naming.ldap.attributes.binary", "objectSID");

// the following is helpful in debugging errors
//env.put("com.sun.jndi.ldap.trace.ber", System.err);

LdapContext ctx = new InitialLdapContext();

LDAPTest ldap = new LDAPTest();

//1) lookup the ldap account
SearchResult srLdapUser = ldap.findAccountByAccountName(ctx, ldapSearchBase, ldapAccountToLookup);

//2) get the SID of the users primary group
String primaryGroupSID = ldap.getPrimaryGroupSID(srLdapUser);

//3) get the users Primary Group
String primaryGroupName = ldap.findGroupBySID(ctx, ldapSearchBase, primaryGroupSID);
}

public SearchResult findAccountByAccountName(DirContext ctx, String ldapSearchBase, String accountName) throws NamingException {

String searchFilter = "(&(objectClass=user)(sAMAccountName=" + accountName + "))";

SearchControls searchControls = new SearchControls();
searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);

NamingEnumeration<SearchResult> results = ctx.search(ldapSearchBase, searchFilter, searchControls);

SearchResult searchResult = null;
if(results.hasMoreElements()) {
searchResult = (SearchResult) results.nextElement();

//make sure there is not another item available, there should be only 1 match
if(results.hasMoreElements()) {
System.err.println("Matched multiple users for the accountName: " + accountName);
return null;
}
}

return searchResult;
}

public String findGroupBySID(DirContext ctx, String ldapSearchBase, String sid) throws NamingException {

String searchFilter = "(&(objectClass=group)(objectSid=" + sid + "))";

SearchControls searchControls = new SearchControls();
searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);

NamingEnumeration<SearchResult> results = ctx.search(ldapSearchBase, searchFilter, searchControls);

if(results.hasMoreElements()) {
SearchResult searchResult = (SearchResult) results.nextElement();

//make sure there is not another item available, there should be only 1 match
if(results.hasMoreElements()) {
System.err.println("Matched multiple groups for the group with SID: " + sid);
return null;
} else {
return (String)searchResult.getAttributes().get("sAMAccountName").get();
}
}
return null;
}

public String getPrimaryGroupSID(SearchResult srLdapUser) throws NamingException {
byte[] objectSID = (byte[])srLdapUser.getAttributes().get("objectSid").get();
String strPrimaryGroupID = (String)srLdapUser.getAttributes().get("primaryGroupID").get();

String strObjectSid = decodeSID(objectSID);

return strObjectSid.substring(0, strObjectSid.lastIndexOf('-') + 1) + strPrimaryGroupID;
}

/**
* The binary data is in the form:
* byte[0] - revision level
* byte[1] - count of sub-authorities
* byte[2-7] - 48 bit authority (big-endian)
* and then count x 32 bit sub authorities (little-endian)
*
* The String value is: S-Revision-Authority-SubAuthority[n]...
*
* Based on code from here - http://forums.oracle.com/forums/thread.jspa?threadID=1155740&tstart=0
*/
public static String decodeSID(byte[] sid) {

final StringBuilder strSid = new StringBuilder("S-");

// get version
final int revision = sid[0];
strSid.append(Integer.toString(revision));

//next byte is the count of sub-authorities
final int countSubAuths = sid[1] & 0xFF;

//get the authority
long authority = 0;
//String rid = "";
for(int i = 2; i <= 7; i++) {
authority |= ((long)sid[i]) << (8 * (5 - (i - 2)));
}
strSid.append("-");
strSid.append(Long.toHexString(authority));

//iterate all the sub-auths
int offset = 8;
int size = 4; //4 bytes for each sub auth
for(int j = 0; j < countSubAuths; j++) {
long subAuthority = 0;
for(int k = 0; k < size; k++) {
subAuthority |= (long)(sid[offset + k] & 0xFF) << (8 * k);
}

strSid.append("-");
strSid.append(subAuthority);

offset += size;
}

return strSid.toString();
}
}

</source>

Query Active Directory (ldaptest) - Revision history

George2: Created page with " package ldaptest; import java.util.Hashtable; import javax.naming.Context; import javax.naming.NamingEnumeration; import javax.naming.NamingException; i..."