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#!/bin/sh
# turn shadow passwords on or off on a Debian system
set -e
shadowon () {
set -e
if [ -n "$DPKG_ROOT" ] \
&& cmp "${DPKG_ROOT}/etc/passwd" "${DPKG_ROOT}/usr/share/base-passwd/passwd.master" 2>/dev/null \
&& cmp "${DPKG_ROOT}/etc/group" "${DPKG_ROOT}/usr/share/base-passwd/group.master" 2>/dev/null; then
# If dpkg is run with --force-script-chrootless and if /etc/passwd
# and /etc/group are unchanged, we avoid the chroot() call by manually
# processing the files. This produces bit-by-bit identical results
# compared to the normal case as shown by the CI setup at
# https://salsa.debian.org/helmutg/dpkg-root-demo/-/jobs
for f in passwd group; do
cp -a "${DPKG_ROOT}/etc/$f" "${DPKG_ROOT}/etc/$f-"
done
chmod 600 "${DPKG_ROOT}/etc/passwd-"
sed -i 's/^\([^:]\+\):\*:/\1:x:/' "${DPKG_ROOT}/etc/group" "${DPKG_ROOT}/etc/passwd"
[ -n "$SOURCE_DATE_EPOCH" ] && epoch=$SOURCE_DATE_EPOCH || epoch=$(date +%s)
sed "s/^\([^:]\+\):.*/\1:*:$((epoch/60/60/24)):0:99999:7:::/" "${DPKG_ROOT}/etc/passwd" > "${DPKG_ROOT}/etc/shadow"
sed "s/^\([^:]\+\):.*/\1:*::/" "${DPKG_ROOT}/etc/group" > "${DPKG_ROOT}/etc/gshadow"
touch "${DPKG_ROOT}/etc/.pwd.lock"
chmod 600 "${DPKG_ROOT}/etc/.pwd.lock"
else
pwck -q -r
grpck -r
pwconv
grpconv
fi
chown root:root "${DPKG_ROOT}/etc/passwd" "${DPKG_ROOT}/etc/group"
chmod 644 "${DPKG_ROOT}/etc/passwd" "${DPKG_ROOT}/etc/group"
chown root:shadow "${DPKG_ROOT}/etc/shadow" "${DPKG_ROOT}/etc/gshadow"
chmod 640 "${DPKG_ROOT}/etc/shadow" "${DPKG_ROOT}/etc/gshadow"
}
shadowoff () {
set -e
pwck -q -r
grpck -r
pwunconv
grpunconv
# sometimes the passwd perms get munged
chown root:root /etc/passwd /etc/group
chmod 644 /etc/passwd /etc/group
}
case "$1" in
"on")
if shadowon ; then
echo Shadow passwords are now on.
else
echo Please correct the error and rerun \`$0 on\'
exit 1
fi
;;
"off")
if shadowoff ; then
echo Shadow passwords are now off.
else
echo Please correct the error and rerun \`$0 off\'
exit 1
fi
;;
*)
echo Usage: $0 on \| off
;;
esac
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