Replace deprecated crypt module and bump version to 2.1

[ericbsd]

The crypt module is removed in Python 3.13. Verify the password by calling crypt(3) from libcrypt through ctypes instead, comparing in constant time and rejecting empty or locked hashes. Stop printing part of the stored hash to stdout.

Replace the no-op package_dir with packages=[] in setup.py.

Summary by Sourcery

Maintain password authentication compatibility with modern Python while improving verification security and package configuration.

Bug Fixes:

• Replace the deprecated Python crypt module with libcrypt-based password verification compatible with Python 3.13.
• Harden password checks by rejecting empty or locked hashes, comparing results in constant time, and avoiding stored-hash output.

Enhancements:

• Clean up package configuration by replacing the no-op package_dir setting with an explicit empty package list.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The PR prepares the project for Python 3.13 by replacing the deprecated crypt module with libcrypt access via ctypes and safer password-hash handling, while updating packaging configuration and the release version to 2.1.

Sequence diagram for ctypes-based password verification

sequenceDiagram
    participant User
    participant software_station
    participant libcrypt

    User->>software_station: enter password
    software_station->>software_station: ctypes.CDLL
    software_station->>libcrypt: crypt(password, stored_hash)
    libcrypt-->>software_station: computed_hash
    software_station->>software_station: hmac.compare_digest
    alt empty or locked stored hash
        software_station-->>User: reject password
    else hashes differ
        software_station-->>User: reject password
    else hashes match
        software_station-->>User: accept password
    end

Loading

File-Level Changes

Change	Details	Files
Replace Python's removed crypt-module dependency with a ctypes-based libcrypt password verification path.	Load and call the system crypt(3) function through ctypes. Compare the generated hash with the stored hash in constant time. Reject empty and locked password hashes before verification. Remove stdout output that exposed part of the stored hash.	software-station
Update packaging metadata for the 2.1 release.	Replace the no-op package_dir configuration with packages=[]. Bump the package version to 2.1.	setup.py

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. This changes password verification at an authentication boundary by replacing Python's crypt call with a direct libcrypt invocation and digest comparison. If the ctypes binding or hash handling is wrong, users could be denied access or an invalid password could be accepted; reverting restores the old check but cannot undo any access granted while the faulty verifier was live.

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