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PHKP: A PHP implementation for a HKP keyserver

About

PHKP is an implementation of the OpenPGP HTTP Keyserver Protocol (HKP) in PHP. It allows people to serve a PGP keyserver on most webservers, provided that the webserver has GnuPG and PHP with exec() enabled. Searching, requesting and submitting (optional) of keys are all supported.

Installation

  • Copy the phkp.php script to your webserver directory. If you can put it in the root directory of your web dir, you can rename it to index.php. If you don't do this, you will need to redirect every request to /pks to this script. For example, using Apache rewrite rules:

      RewriteRule ^/pks/(.*)   /phkp.php?/pks/$1

  • Modify the values in index.php to reflect your settings and create the necessary directories

Usage

Simply point your gpg to the right keyserver and port. For example:

	gpg --keyserver hkp://example.com:80 --search-keys Remko
	gpg --keyserver hkp://example.com:80 --send-keys 8E041080
	gpg --keyserver hkp://example.com:80 --recv-keys 8E041080

Known Issues

  • Expiration and revocation is only detected with the english version of GnuPG. Other languages will omit this information.

TODO

  • Provide more information for uids in searches
  • Return human readable output if 'mr' option is not set
  • Make more robust, fool proof and secure
  • Better logging
  • More graceful calls to GnuPG
  • Fine-tune GnuPG options (try to avoid creation of trustdb etc. if possible)
  • Look at expiration date computation. Currently has a workaround to avoid being one day off.

Disclaimer

This software is not production-ready. It probably contains bugs and security leaks. Use at your own risk.