DEFFS

A custom FUSE-based filesystem that distributes encrypted shards of data across machines on a local network, allowing those files to be accessible from any machine.

Installation

• Install dependencies - sudo apt-get install libfuse-dev libssl-dev

• Uncomment user_allow_other from the last line of /etc/fuse.conf

• Build

cmake .
mkdir bin
cmake --build ./ --target DEFFS -- -j 6

• Mount

mkdir ~/deffs_mountpoint
mkdir ~/deffs_storepoint

./bin/DEFFS ~/deffs_mountpoint ~/deffs_storepoint

# DEFFS now mounted at ~/deffs_mountpoint
# Files are interacted with within the mountpoint, but are stored at the storepoint
# It is not advised to modify any files in your storepoint

Usage

Right now, DEFFS can be used like a typical EXT4 filesystem. It will store encrypted data shards in <storepoint>/.shards/, so modifying files in that folder or the folder itself will break DEFFS.

This filesystem's encryption is based on the AES_encrypt method, meaning:

• It is NOT (yet) resistant to attackers
• Making files with unencrypted content longer than 15 characters is undefined (soon to be fixed)

Currently, DEFFS only encrypts files when the write syscall is called. Soon, write_buf will be supported as well. Files are decrypted upon read.

Proper usage of DEFFS looks like this:

cd mountpoint

mkdir test
touch hello
echo "hello world" > test/helloworld.txt

cat test/helloworld.txt

Progress

• [ ] Distributed
• [x] Encrypted
• [ ] Fractured
• [x] File System