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#!/bin/sh
#
# rotate keys and reencrypt passwords
#
# Reuse identities file: export PA_IDENTITIES=~/.local/share/pa/identities
# Reuse recipients file: export PA_RECIPIENTS=~/.local/share/pa/recipients
die() {
printf '%s: %s.\n' "$(basename "$0")" "$1" >&2
exit 1
}
age=$(command -v age || command -v rage) ||
die "age not found, install per https://age-encryption.org"
age_keygen=$(command -v age-keygen || command -v rage-keygen) ||
die "age-keygen not found, install per https://age-encryption.org"
# Restrict permissions of any new files to only the current user.
umask 077
basedir=${XDG_DATA_HOME:=$HOME/.local/share}/pa
: "${PA_DIR:=$basedir/passwords}"
realstore=$(realpath "$PA_DIR") ||
die "Couldn't get path to password directory"
tmpdir=$basedir/tmp
mkdir "$tmpdir" ||
die "Couldn't create temporary directory"
trap 'rm -rf "$tmpdir"; exit' EXIT
trap 'rm -rf "$tmpdir"; trap - INT; kill -s INT 0' INT
cp -Rp "$realstore" "$tmpdir/passwords" ||
die "Couldn't copy password directory"
# Remove git repository for forward secrecy.
rm -rf "$tmpdir/passwords/.git"
[ "$PA_IDENTITIES" ] && cp "$PA_IDENTITIES" "$tmpdir/identities"
[ "$PA_RECIPIENTS" ] && cp "$PA_RECIPIENTS" "$tmpdir/recipients"
$age_keygen >>"$tmpdir/identities" 2>/dev/null
$age_keygen -y "$tmpdir/identities" >>"$tmpdir/recipients" 2>/dev/null
pa l | while read -r name; do
pa s "$name" |
$age -R "$tmpdir/recipients" -o "$tmpdir/passwords/$name.age" ||
die "Couldn't encrypt $name.age"
done
trap - INT EXIT
rm -rf "$realstore" ||
die "Couldn't remove password directory"
mv "$tmpdir/passwords" "$realstore"
mv "$tmpdir/identities" "$(realpath "$basedir/identities")"
mv "$tmpdir/recipients" "$(realpath "$basedir/recipients")"
rmdir "$tmpdir"
# Recreate git repository if needed.
pa l >/dev/null