109 lines
2.8 KiB
Nix
109 lines
2.8 KiB
Nix
{ pkgs, lib }:
|
|
|
|
#usage: ecrypt mount /var/crypted /var/unencrypted
|
|
pkgs.writers.writeDashBin "ecrypt" ''
|
|
set -euf
|
|
set -x
|
|
|
|
PATH=${lib.makeBinPath (with pkgs; [
|
|
coreutils
|
|
ecryptfs
|
|
gnused
|
|
gnugrep
|
|
jq
|
|
mount
|
|
keyutils
|
|
umount
|
|
])}
|
|
|
|
# turn echo back on if killed
|
|
trap 'stty echo' INT
|
|
|
|
case "$1" in
|
|
init)
|
|
shift
|
|
mkdir -p "$1" "$2"
|
|
|
|
# abort if src or dest are not empty
|
|
if [ -e "$1"/.cfg.json ]; then
|
|
echo 'source dir is already configured, aborting'
|
|
exit 1
|
|
elif ls -1qA "$2" | grep -q .; then
|
|
echo 'destination dir is not empty, aborting'
|
|
exit 1
|
|
else
|
|
stty -echo
|
|
printf "passphrase: "
|
|
read passphrase
|
|
stty echo
|
|
sig=$(echo "$passphrase" | ecryptfs-add-passphrase | grep 'Inserted auth tok' | sed 's/.*\[\(.*\)\].*/\1/')
|
|
mount -t ecryptfs \
|
|
-o ecryptfs_unlink_sigs,ecryptfs_fnek_sig="$sig",ecryptfs_key_bytes=16,ecryptfs_cipher=aes,ecryptfs_sig="$sig" \
|
|
"$1" "$2"
|
|
|
|
# add sig to json state file
|
|
jq -n --arg sig "$sig" '{ "sig": $sig }' > "$1"/.cfg.json
|
|
fi
|
|
;;
|
|
|
|
mount)
|
|
shift
|
|
if ! [ -e "$1"/.cfg.json ]; then
|
|
echo '.cfg.json missing in src'
|
|
exit 1
|
|
fi
|
|
old_sig=$(cat "$1"/.cfg.json | jq -r .sig)
|
|
|
|
# check if key is already in keyring, otherwise add it
|
|
|
|
if keyctl list @u | grep -q "$old_sig"; then
|
|
echo 'pw already saved'
|
|
else
|
|
stty -echo
|
|
printf "passphrase: "
|
|
read passphrase
|
|
stty echo
|
|
new_sig=$(echo "$passphrase" | ecryptfs-add-passphrase | grep 'Inserted auth tok' | sed 's/.*\[\(.*\)\].*/\1/')
|
|
|
|
# check if passphrase matches sig
|
|
if [ "$old_sig" != "$new_sig" ]; then
|
|
echo 'passphrase does not match sig, bailing out'
|
|
new_keyid=$(keyctl list @u | grep "$new_sig" | sed 's/\([0-9]*\).*/\1/')
|
|
keyctl revoke "$new_keyid"
|
|
keyctl unlink "$new_keyid"
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
sig=$old_sig
|
|
keyid=$(keyctl list @u | grep "$sig" | sed 's/\([0-9]*\).*/\1/')
|
|
if (ls -1qA "$2" | grep -q .); then
|
|
echo 'destination is not empty, bailing out'
|
|
exit 1
|
|
else
|
|
mount -i -t ecryptfs \
|
|
-o ecryptfs_passthrough=no,verbose=no,ecryptfs_unlink_sigs,ecryptfs_fnek_sig="$sig",ecryptfs_key_bytes=16,ecryptfs_cipher=aes,ecryptfs_sig="$sig" \
|
|
"$1" "$2"
|
|
fi
|
|
;;
|
|
|
|
unmount)
|
|
shift
|
|
|
|
sig=$(cat "$1"/.cfg.json | jq -r .sig)
|
|
keyid=$(keyctl list @u | grep "$sig" | sed 's/\s*\([0-9]*\).*/\1/')
|
|
|
|
umount "$2" || :
|
|
keyctl revoke "$keyid"
|
|
keyctl unlink "$keyid"
|
|
;;
|
|
|
|
*)
|
|
echo 'usage:
|
|
ecrypt init /tmp/src/ /tmp/dst/
|
|
ecrypt mount /tmp/src/ /tmp/dst/
|
|
ecrypt unmount /tmp/src/ /tmp/dst/
|
|
'
|
|
esac
|
|
''
|