Use PBKDF2 password records and harden TLS init - #78
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Replaced the custom SHA256+Base64 password flow with GnuTLS-based PBKDF2-SHA256 records (`scheme$iterations$salt$hash`) and added dedicated generate/verify helpers. FTP login (`PASS`) and `fftp -p` now use the new record format, with secure zeroing of sensitive buffers. Also improved startup reliability by making TLS initialization return explicit success/failure, handling partial-init cleanup safely, and tracking global GnuTLS init/deinit state. Updated sample config defaults to avoid embedded plaintext admin passwords and document hash generation. Commit description made with Copilot.
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Replaced the custom SHA256+Base64 password flow with GnuTLS-based PBKDF2-SHA256 records (
scheme$iterations$salt$hash) and added dedicated generate/verify helpers. FTP login (PASS) andfftp -pnow use the new record format, with secure zeroing of sensitive buffers.Also improved startup reliability by making TLS initialization return explicit success/failure, handling partial-init cleanup safely, and tracking global GnuTLS init/deinit state. Updated sample config defaults to avoid embedded plaintext admin passwords and document hash generation. Commit description made with Copilot.