Skip to main content

Encrypting stored passwords in spring web application

We take security very seriously and have taken steps to harden our services so if some one has ssh access to the box he wont be able to read the files but the webapp has to be able to read the spring config which has passwords to database so we need to protect it from any file download vulnerability.

So the plan was to encrypt passwords stored in spring files and decrypt it at runtime. As we had to decrypt the passwords back this has to be a symmetric encryption but with salt.  After doing some research I found jasypt library that would be able to do this. The steps I followed were:

1) move all passwords to a separate  file called as XXX_passwords.properties
2)changed spring xml to use property placeholders like ${mysql.user.password}.
3) added spring beans to load the password and decrypt them using the ENV variable ENCRYPTION_PASSWORD and added two jars to class path jasypt-1.9.1.jar and jasypt-spring31-1.9.1.jar

    <bean id="encryptablePropertyPlaceholderConfigurer" class="org.jasypt.spring31.properties.EncryptablePropertyPlaceholderConfigurer">
       <constructor-arg ref="configurationEncryptor" />
       <property name="location" value="classpath:xxx_passwords.properties" />
    </bean>
    <bean id="configurationEncryptor" class="org.jasypt.encryption.pbe.StandardPBEStringEncryptor">
       <property name="config" ref="environmentVariablesConfiguration" />
    </bean>
    <bean id="environmentVariablesConfiguration"
          class="org.jasypt.encryption.pbe.config.EnvironmentStringPBEConfig">
       <property name="algorithm" value="PBEWithMD5AndDES" />
       <property name="passwordEnvName" value="ENCRYPTION_PASSWORD" />
    </bean>
4)Wrote a sample property file encoder that will take a normal file and encode the passwords.
public class PPFileEncoder {
    public static void main(String[] args) throws Exception {
        String filePath = args[0];
        File file = new File(filePath);
        if (!file.exists()) {
            System.out.println("File " + filePath + " doesnt exits");
        }
        Properties inputProps = new Properties();
        FileReader reader = new FileReader(filePath);
        inputProps.load(reader);
        reader.close();
        EnvironmentStringPBEConfig config = new EnvironmentStringPBEConfig();
        config.setAlgorithm("PBEWithMD5AndDES");
        config.setPasswordEnvName("ENCRYPTION_PASSWORD");
        StandardPBEStringEncryptor encryptor = new StandardPBEStringEncryptor();
        encryptor.setConfig(config);

        Properties outputProps = new Properties();
        for (Entry entry : inputProps.entrySet()) {
            String key = (String) entry.getKey();
            String value = (String) entry.getValue();
            outputProps.setProperty(key, getEncryptedProperty(encryptor, value));
        }
        FileWriter writer = new FileWriter(file);
        outputProps.store(writer, "Encrypted file");
        writer.close();
    }

    private static String getEncryptedProperty(StandardPBEStringEncryptor encryptor, String value) {
        if (value == null || value.trim().startsWith("ENC(")) {
            return value;
        } else {
            return "ENC(" + encryptor.encrypt(value) + ")";
        }
    }
}

5)Changed install process to encrypt passwords as the last step of install and overwrite the original property file.
6)Now ops will unset the env variable once app is up.

with jasypt if your original file was

mysql.user.password=KalpeshPatel
it would become
mysql.user.password=ENC(B4UEFvcfdIJqavADLRTZqw\=\=)






Good thing about this solution is that devops  can choose a completely random value for ENCRYPTION_PASSWORD variable everytime they install the installer and different value for different machines.

Comments

Post a Comment

Popular posts from this blog

RabbitMQ java clients for beginners

Here is a sample of a consumer and producer example for RabbitMQ. The steps are
Download ErlangDownload Rabbit MQ ServerDownload Rabbit MQ Java client jarsCompile and run the below two class and you are done.
This sample create a Durable Exchange, Queue and a Message. You will have to start the consumer first before you start the for the first time.

For more information on AMQP, Exchanges, Queues, read this excellent tutorial
http://blogs.digitar.com/jjww/2009/01/rabbits-and-warrens/

+++++++++++++++++RabbitMQProducer.java+++++++++++++++++++++++++++
import com.rabbitmq.client.Connection; import com.rabbitmq.client.Channel; import com.rabbitmq.client.*; public class RabbitMQProducer { public static void main(String []args) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setUsername("guest"); factory.setPassword("guest"); factory.setVirtualHost("/"); factory.setHost("127.0.0.1"); factory.setPort(5672); Conne…

Logging to Graphite monitoring tool from java

We use Graphite as a tool for monitoring some stats and watch trends. A requirement is to monitor impact of new releases as build is deployed to app nodes to see if things like
1) Has the memcache usage increased.
2) Has the no of Java exceptions went up.
3) Is the app using more tomcat threads.
Here is a screenshot

We changed the installer to log a deploy event when a new build is deployed. I wrote a simple spring bean to log graphite events using java. Logging to graphite is easy, all you need to do is open a socket and send lines of events.
import org.slf4j.Logger;import org.slf4j.LoggerFactory; import java.io.OutputStreamWriter; import java.io.Writer; import java.net.Socket; import java.util.HashMap; import java.util.Map; public class GraphiteLogger { private static final Logger logger = LoggerFactory.getLogger(GraphiteLogger.class); private String graphiteHost; private int graphitePort; public String getGraphiteHost() { return graphiteHost; } public void setGraphite…

Jersey posting multipart data

This took me sometime to figure out mostly it was because I was only including jersey-multipart-1.6.jar but I was not including mimepull-1.3.jar.

So the intent is to upload a file using REST api and we need pass meta attributes in addition to uploading the file. Also the intent is to stream the file instead of first storing it on the local disk. Here is some sample code.
@Path("/upload-service") public class UploadService { @Context protected HttpServletResponse response; @Context protected HttpServletRequest request; @POST @Consumes(MediaType.MULTIPART_FORM_DATA) @Produces(MediaType.APPLICATION_JSON) public String uploadFile(@PathParam("fileName") final String fileName, @FormDataParam("workgroupId") String workgroupId, @FormDataParam("userId") final int userId, @FormDataParam("content") final InputStream content) throws JSONException { //.......Upload the file to S3 or netapp or any storage service } }
Now to tes…