SSL Certificate Checker

This script retrieves SSL certificate information for a list of domains, storing the output in separate directories for successful connections and errors. It also supports connecting through a proxy for specific subdomains and utilizes parallel processing for efficiency.

Features

• Retrieves SSL certificate details including subject, issuer, and validity period.
• Supports proxy connections for designated subdomains.
• Outputs results to output/success/ for successful connections and output/error/ for connection errors.
• Uses parallel processing to handle multiple domains simultaneously, improving speed and efficiency.

Requirements

• Perl 5
• Perl modules:
  • IO::Socket::SSL
  • Net::SSLeay
  • Parallel::ForkManager
  • File::Path (part of Perl core)

Installation

1. Install the required Perl modules:

   sudo cpan install IO::Socket::SSL Net::SSLeay Parallel::ForkManager

2. Ensure you have OpenSSL installed and the development headers if needed:

   • RedHat/Rockylinux:

     sudo yum install openssl-devel

   • Ubuntu/Debian:

     sudo apt-get install libssl-dev

Usage

1. Prepare a file called domains.txt listing the domains and ports to check, one per line in the format:

   example.com:443
   sub.example.com:443
   

2. Run the script:

   perl ssl_certificate_checker.pl

3. Results will be saved in:

   • output/success/ for successful connections.
   • output/error/ for failed connections, along with error details.

Configuration

Proxy Settings

The script supports proxy connections for specific subdomains. To enable this, modify the condition within the script where sub.example.com appears to match the desired subdomains. Configure the $proxy_host and $proxy_port variables for your proxy server.

Parallel Processing

The script uses parallel processing to handle multiple domains at once. You can adjust the number of parallel processes by modifying the $max_processes variable in the script. By default, it is set to 5. This setting can help improve speed when checking multiple domains.

License

This project is licensed under the MIT License