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kernFTP

A project that aims to run a full fledged FTP entirely in kernel space.

Features

  • USER, PASS, TYPE, PASV, EPSV, RETR, LIST, QUIT commands recognized
  • Passive downloads supported in both extended (EPSV) and regular passive mode (PASV).
  • Mount namespacing to fully isolate FTP directories from path traversal escapes and unpermitted accesses using the helper userspace binary run_server.

TODO

  • More essential commands like CWD, PWD, PORT etc.
  • Multithreaded or event based client loop support, whichever comes first.
  • Proper clean up of resources.
  • Fixes for millions of potential BoFs, UAFs and race conditions.

Compile and run

make
sudo ./run_server <your-ftp-directory>

Server runs at port 2121.

Note: You can also insmod kftp.ko directly but you lose the benefit of having an isolated mount namespace.