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Webserver Certchain

webserver_certchain.py is a Python script designed to retrieve and display the certificate chain of a specified web server. The script leverages OpenSSL to extract certificate details such as subject, issuer, expiration date (notAfter), and Subject Alternative Names (SANs).

Features

  • Extracts and displays information from a web server's certificate chain:
    • Subject
    • Issuer
    • Expiration Date (notAfter)
    • Subject Alternative Names (subjectAlternativeName)

Requirements

  • Python 3.x
  • OpenSSL installed and accessible in your system's PATH

Installation

  1. Ensure you have Python installed on your system.
  2. Ensure OpenSSL is available in your system's PATH.
  3. Download the script or clone the repository.

Usage

The script can be run directly via the command line. The basic syntax is:

python webserver_certchain.py <website_fqdn> [webserver_ip|webserver_fqdn] [port]