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-rw-r--r--lass/5pkgs/ecrypt/default.nix108
1 files changed, 108 insertions, 0 deletions
diff --git a/lass/5pkgs/ecrypt/default.nix b/lass/5pkgs/ecrypt/default.nix
new file mode 100644
index 000000000..9bb35a8dc
--- /dev/null
+++ b/lass/5pkgs/ecrypt/default.nix
@@ -0,0 +1,108 @@
+{ 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
+''