December Adventure 2023

On 2023-12-01 I've learned about December Adventure. It's a very nice idea (esp. compared to Advent of Code, as I don't like competing).

My December Adventure will be working on Lacre, a Postfix mail filter encrypting incoming mail before it is written to recipient's inbox.

• Lacre Webgate: Add identity table — I've finished introduction of identity database.
• Lacre backend: Fix unencrypted delivery and key removal — I've re-read and merged my recent work on storing identities in a database.
• Lacre backend: Enhance validation of keys with multiple email addresses — I've analysed the flow, and found that:
  • we enforce keys with single email during key verification in Lacre Webgate (in public_html/include/gpg.php:76);
  • to handle keys with multiple emails I'll need to rework GnuPG.confirm_key function.
• I've learned a bit about asyncio Streams in Python by writing a little program. So far I seem to be doing something wrong.

• I've implemented a tiny key-value store in Python using asyncio streams and email. It's an exercise before I approach something bigger but with similar semantics in Lacre backend.
• Next, I've written something very similar based on http.server Python package.

• I've added support for TTL to my tiny key-value store, learning how to use named tuples and delayed callbacks with asyncio.

• I've fixed cron script that I've broken during refactoring. (I should rework its tests too.)
• I've fixed identity removal.
• I've added support for -r or –reload flag to import command, which deletes all keys before importing them from GnuPG's pubring.kbx.

• I've written some Python decorators. I suspect reading decorators from the standard library could be enlightening.

• Today I've skimmed some functools code and written another Python decorator. This one emits an auditing event before execution of the decorated function.

• Fixed some minor error-reporting issues. Now when an expired key prevents Lacre from encrypting a message, a short error message is logged instead of a full trace-back.
• Updated admin CLI documentation to include info about import command and its -r option.
• Tagged 0.2 RC2.
• Started working on Rust re-implementation of the Lacre admin's CLI tool. Started by trying to connect to sqlite.