Dinesh on Java

MongoDB can be run in a secure mode where access to databases is controlled through name and password authentication. When run in this mode, any client application must provide a name and password before doing any operations. In the Java driver, you simply do the following with a MongoClient instance:

MongoClient mongoClient = new MongoClient();
DB db = mongoClient.getDB("test");
boolean auth = db.authenticate(myUserName, myPassword);

If the name and password are valid for the database, auth will be true. Otherwise, it will be false. You should look at the MongoDB log for further information if available.

Most users run MongoDB without authentication in a trusted environment.In this tutorial, we show you how to start MongoDB in secure mode (authentication access is require), and uses Java driver to connect MongoDB with provided username and password.

1. Start MongoDB in Secure Mode

Create an user “dineshonjava” in MongoDB database “dineshonjavaDB”.

> use dineshonjavaDB
> db.addUser("dineshonjava","password")

To start mongoDB in secure mode, just provide the “–auth” argument

> mongod --auth

2. Now, the MongoDB is started in secure /authentication mode (authenticate with username and password is require).

if you try to access the auth db then we will get following.

> db.auth("dineshonjava","password")
1
> db.auth("dineshonjava","password1")
Error: { errmsg: "auth fails", ok: 0.0 }
0
>

3. Java connect MongoDB

In Java, you can use “db.authenticate” to handle the MongoDB authentication.

DB db = mongo.getDB("dineshonjavaDB");
boolean auth = db.authenticate("dineshonjava", "password".toCharArray());

If username and password is valid, “auth” will be true, else it will be false and return the following error pattern

com.mongodb.MongoException: unauthorized db:dineshonjavaDB lock type:-1 client:192.168.1.3
 at com.mongodb.MongoException.parse(MongoException.java:82)
 at com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:302)
 at com.mongodb.DBCursor._check(DBCursor.java:354)
 at com.mongodb.DBCursor._hasNext(DBCursor.java:484)
 at com.mongodb.DBCursor.hasNext(DBCursor.java:509)
 at com.dineshonjava.mongo.test.MongoAuthDemo.main(MongoAuthDemo.java:24)

See the full example as follows.

package com.dineshonjava.mongo.test;

import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.Mongo;
import com.mongodb.MongoException;

/**
 * @author Dinesh Rajput
 *
 */
public class MongoAuthDemo {

 public static void main(String[] args) {
 
 try {
 
  Mongo mongo = new Mongo("localhost", 27017);
  DB db = mongo.getDB("dineshonjavaDB");
  boolean auth = db.authenticate("dineshonjava", "password".toCharArray());
  DBCollection collection = db.getCollection("empCollection");
  if(auth){
   System.out.println("TRUE");
  }else{
   System.out.println("FALSE");
  }
   
  System.out.println("Done");
 
  } catch (UnknownHostException e) {
   e.printStackTrace();
  } catch (MongoException e) {
   e.printStackTrace();
  }
 
 }

}

If everything is fine then we will get the following output-

Download Source Code + Libs
MongoDBAuthDemo.zip

References
MongoDB Java Authentication
MongoDB Security and Authentication