Skip to main content

How to import an untrusted website certificate to the Java keystore

Java uses the keystore file named cacerts. It should already contain all trusted root CA certificates that are used to sign intermediate and leaf certificates. Leaf certificates are end user certificates that are used to secure websites with HTTPS. However, sometimes a root CA certificate might be missing from the Java keystore or a website might be using a self-signed certificate which will result in the following exception when you try to access the website from Java code:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
For me it happened with a certificate issued by COMODO. In this case the easiest solution is to add the website certificate to the Java keystore. Shortly, it requires exporting the certificate from the website, importing it into the keystore and restarting your Java application.
Please bear in mind that importing a self-signed certificate this way will merely hide the security issue and not solve it. So you should always use reliable trusted certificates on Production, for example, there are free ones issued by Let's Encrypt Certificate Authority.
  1. Export website certificate.
  2. Import certificate to Java keystore.
  3. Combined script.
Export website certificate
The following command will save the website certificate to a local file provided you set $HOST and $PORT variables accordingly:
echo -n | openssl s_client -connect $HOST:$PORT | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > $HOST.cert

Import certificate to Java keystore
The following command will import the certificate $FILE with the alias $NAME in the cacerts Java keystore where "changeit" is the default password.
keytool -keystore cacerts -importcert -alias $NAME -file $FILE -storepass changeit

Combined script
Finally let's combine it into a nice script to speed up the process. We'll create a script named import_certificate.sh.
#!/bin/sh

HOST=$1
PORT=$2

echo -n | openssl s_client -connect $HOST:$PORT | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > $HOST.cert
name=`echo $HOST | tr '.' '_'`
echo keytool -keystore cacerts -importcert -alias $name -file $HOST.cert -storepass changeit
Now in order to fix the issue with untrusted certificate, just run it the following way:
import_certificate.sh www.website.com 443

Comments

Popular posts from this blog

DynamicReports and Spring MVC integration

This is a tutorial on how to exploit DynamicReports reporting library in an existing  Spring MVC based web application. It's a continuation to the previous post where DynamicReports has been chosen as the most appropriate solution to implement an export feature in a web application (for my specific use case). The complete code won't be provided here but only the essential code snippets together with usage remarks. Also I've widely used this tutorial that describes a similar problem for an alternative reporting library. So let's turn to the implementation description and start with a short plan of this how-to: Adding project dependencies. Implementing the Controller part of the MVC pattern. Modifying the View part of the MVC pattern. Modifying web.xml. Adding project dependencies I used to apply Maven Project Builder throughout my Java applications, thus the dependencies will be provided in the Maven format. Maven project pom.xml file: net.sourcefo

Do It Yourself Java Profiling

This article is a free translation of the Russian one that is a transcript of the Russian video lecture done by Roman Elizarov at the Application Developer Days 2011 conference. The lecturer talked about profiling of Java applications without any standalone tools. Instead, it's suggested to use internal JVM features (i.e. threaddumps, java agents, bytecode manipulation) to implement profiling quickly and efficiently. Moreover, it can be applied on Production environments with minimal overhead. This concept is called DIY or "Do It Yourself". Below the lecture's text and slides begin. Today I'm giving a lecture "Do It Yourself Java Profiling". It's based on the real life experience that was gained during more than 10 years of developing high-loaded finance applications that work with huge amounts of data, millions currency rate changes per second and thousands of online users. As a result, we have to deal with profiling. Application pro

Using Oracle impdp utility to reload database

Here I'll show an example of using Oracle Data Pump Import (impdp) utility. It allows importing Oracle data dumps. Specifically, below is the list of steps I used on an existing Oracle schema to reload the data from a dump. Steps to reload the data from an Oracle dump We start with logging into SQL Plus as sysdba to be able to manage users. sqlplus sys/password@test as sysdba Dropping the existing user. CASCADE clause will ensure that all schema objects are removed before the user. SQL> DROP USER test CASCADE; Creating a fresh user will automatically create an empty schema with the same name. SQL> CREATE USER test IDENTIFIED BY "testpassword"; Granting DBA role to the user to load the dump later. Actually, it's an overkill and loading the dump can be permitted using a more granular role IMP_FULL_DATABASE . SQL> GRANT DBA TO test; Registering the directory where the dump is located. SQL> CREATE DIRECTORY dump_dir AS '/home/test/dumpd