Activeeon - SSL Certificate Generator for ProActive

This project includes utility tools to generate trusted SSL certificates and keystores to be used by ProActive, in order to establish secure SSL communications with client hosts. In particular, this project includes two tools, namely: (1) a shell script to generate SSL certificates for localhost (when running ProActive locally), and (2) a Java client to generate SSL certificates for a specific domain.

1. SSL certificate for localhost

To generate a trusted SSL certificate for localhost, we create a shell script called generate_trusted_cert_and_keystore_for_localhost.sh, which is located under the folder ssl-certificate-for-localhost. The script proceed through the following steps:

• First, it considers a local Certification Authority (CA) called ActiveeonCA.
• It generates a private key (ActiveeonCA.key) a local root certificate (ActiveeonRootCA.crt) for ActiveeonCA.
• After that, the script generates a private key (localhost.key) and a certificate (localhost.crt) for localhost. The localhost certificate is signed by the local root certificate ActiveeonRootCA.crt.
• Then, the script stores localhost.key and localhost.crt in a key store called keystore.
• The generated keystore is to be used by ProActive for SSL communication and must be placed under ${ProActive_Home}/config/web.
• To make the certificate used by ProActive trusted by the client host:
  • Either add ActiveeonRootCA.crt to the OS trust store (as explained here)
  • Or add ActiveeonRootCA.crt to the client web browser (for instance, In Mozilla Firefox, click Tools > Options > Advanced. Scroll down, click Manage Certificates, click Authorities and then import ActiveeonRootCA.crt).

The script generate_trusted_cert_and_keystore_for_localhost.sh uses two files: (i) v3.ext, used to create localhost.crt, and (ii) secret, which contains a single password used to secure all private keys and keystores.

2. SSL certificate for specific domain (e.g., try.activeeon.com)

We extend an existing Java client to generate SSL certificates for a specific domain. The java client uses the ACME (Automatic Certificate Management Environment) protocol to connect to an ACME server, notably Let's Encrypt server. It performs all necessary steps to generate SSL certificates. Our Java client mainly contains three classes:

• SSLCertificateGenerator: Its role is twofold: (i) it creates a domain challenge, i.e., a specific static web resource that sould be accessible under the considered domain, and (ii) generate SSL certificate for the considered domain one the ACME challenge is met.
• WebResource: It creates the static web resource needed to meet the ACME challenge.
• EmbeddedJetty: It runs an embedded web application server (Jetty) that serves the created static web resource.

As an example of ACME challenge (required to generate the SSL certificate for a given domain)

• The following resource must be created: https://domain/.well-know/acme-challenge/kJmvx69CEVe5uEPMwNqRiHXyni__7t4sp-aJaBTaFIE
• It must contain the following content: kJmvx69CEVe5uEPMwNqRiHXyni__7t4sp-aJaBTaFIE.XMOaXhDazt2A3R42GzSEFIOFs7jsiUgY6xc1N2iL0MY

Build Jar

Execute the following command to produce a jar file called ssl-certificate-generator-all-xxxxVersion.jar

./gradlew shadowJar

Generate certificate

java -jar ssl-certificate-generator-all-xxxxVersion.jar -d domain_hostname

e.g., java -jar ssl-certificate-generator-all-xxxxVersion.jar -d try.activeeon.com -p 8080

The jar takes further arguments as input. To get more help about these arguments run, e.g.,: java -jar ssl-certificate-generator-all-xxxxVersion.jar -d try.activeeon.com -h

Meet ACME challenge when using a web server to access the considered domain

When the domain (concerned by the SSL certificate) is accessible via a web server like Apache or Nginx, the static resources created to meet the ACME challenge cannot be served by the web server in a straightforward manner. To cope with this issue, two solutions are proposed:

• Place and run ssl-certificate-generator-all-xxxxVersion.jar under the resources directory of the web server, e.g., under /var/www/html when using nginx.
• Or add the location (where ssl-certificate-generator-all-xxxxVersion.jar is placed) to the configuration of the web server. For instance, when using nginx add the following block:

location ^~ /.well-known/acme-challenge/ {
    allow  all;
    root  path_to_where_to_run_ssl-certificate-generator-all-xxxxVersion.jar;
}

This is particularly useful when generating SSL certificates for try.activeeon.com, tryqa.activeeon.com and trydev.activeeon.com.