dynamic-security.txt

Server-wide dynamically created security.txt and optionally signed with OpenPGP key using PHP.

https://domain.tld/security.txt

https://domain.tld/.well-known/security.txt

For Apache and Nginx.

^{(Based on Ubuntu 24.04 server, but should work on older versions and other distro's too)}

Features:

• All available fields according to RFC9116 can be configured
  • except for Canonical which is generated automatically based on visited URL
  • and Expires which is generated automatically based on time of visit + 1 year
• Only configured fields will be shown in the output
• Output will be signed if a valid OpenPGP key is supplied
• If a website has a local security.txt file present then the script will not run, so your customers can still create their own security.txt file

Requirements

• Apache (with mod_rewrite enabled) or Nginx
• PHP >= 7.4
• PHP-gnupg extension (only needed when signing with OpenPGP key)
• GnuPG >= 2.0 (only needed when signing with OpenPGP key)

How To Use

Copy

• Copy securitytxt folder to /var/www/

  ^{(for any other location you need to alter apache.conf or nginx.conf)}

Edit desired fields in /var/www/securitytxt/conf/config.php

• Leave empty or comment when the field shouldn't be displayed

• Fields are explained here:

  https://www.rfc-editor.org/rfc/rfc9116#name-field-definitions

When signing with OpenPGP key

• Create folder /var/www/.gnupg

  mkdir /var/www/.gnupg

• Set folder permissions to webserver user

  chown www-data:www-data /var/www/.gnupg

• The first time the script is run you not only need the public key but also the private key.

  Uncomment lines 7 and 9 in /var/www/securitytxt/sign/sign.php and line 55 in /var/www/securitytxt/conf/config.php.

  After the first successful run these lines can be commented again or deleted in both files.

Enable webserver configuration

Apache

• Copy /var/www/securitytxt/conf/apache.conf to /etc/apache2/conf-available/securitytxt.conf

  cp /var/www/securitytxt/conf/apache.conf /etc/apache2/conf-available/securitytxt.conf

  Or create a symlink in /etc/apache2/conf-available

  ln -s /var/www/securitytxt/conf/apache.conf /etc/apache2/conf-available/securitytxt.conf

• Check PHP handler and change if necessary

• Enable securitytxt.conf in Apache

  a2enconf securitytxt

• Reload Apache

  systemctl reload apache2

Nginx

• Copy /var/www/securitytxt/conf/nginx.conf to /etc/nginx/snippets/securitytxt.conf

  cp /var/www/securitytxt/conf/nginx.conf /etc/nginx/snippets/securitytxt.conf

  Or create a symlink in /etc/nginx/snippets

  ln -s /var/www/securitytxt/conf/nginx.conf /etc/nginx/snippets/securitytxt.conf

• Check PHP handler and change if necessary

• Reload Nginx

  systemctl reload nginx

Server-wide

• Add below to every website's vhost configuration.

• If you use a management system like ISPConfig, Plesk etc. than add below to the vhost config that is used when adding or altering a website.

  Resync all websites after.

Apache

RewriteEngine on

RewriteOptions Inherit

Nginx

include /etc/nginx/snippets/securitytxt.conf;

Example output

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

# Canonical URL
Canonical: https://domain.tld/.well-known/security.txt

# Our security address
Contact: https://domain.tld/report-vulnerability
Contact: mailto:security@domain.tld

# Our security policy
Policy: https://domain.tld/policy

# Hall of fame
Acknowledgments: https://domain.tld/hall-of-fame

# Jobs for you
Hiring: https://domain.tld/jobs

# These are the languages we speak
Preferred-Languages: en

# Our OpenPGP key
Encryption: https://domain.tld/public.key
Encryption: openpgp4fpr:BAB0EC5B0A8A52D5F4C9D0E8D5DC1526068283E3

# You shouldn't trust this file, once it has expired (like bad milk)
Expires: 2025-01-01T00:00:00Z

-----BEGIN PGP SIGNATURE-----
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=Dhpc
-----END PGP SIGNATURE-----