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#!/bin/sh
# Copyright (c) 2018 - 2022 Chris Cromer
# Released under the 2-clause BSD license.
#
# This is an implementation of the systemd-sysusers command
sysusersver=0.7.3
warninvalid() {
printf "sysusers: %s on line %d of '%s'\n" "${1:-ignoring invalid entry}" \
"${lineno}" "${file}"
: "$((error += 1))"
} >&2
add_group() {
# add_group <name> <id>
if [ "$2" = '-' ]; then
grep -q "^$1:" "$root/etc/group" || groupadd --prefix "$root" -r "$1"
elif ! grep -q "^$1:\|^[^:]*:[^:]*:$2:[^:]*$" "$root/etc/group"; then
groupadd --prefix "$root" -g "$2" "$1"
fi
}
add_user() {
# add_user <name> <uid> <gid> <gecos> <home> [locked]*
if ! id "$1" >/dev/null 2>&1; then
if [ "$2" = '-' ]; then
if [ "$3" = '-' ]; then
useradd --prefix "$root" -rc "$4" -g "$1" -d "$5" -s '/sbin/nologin' "$1"
else
useradd --prefix "$root" -rc "$4" -g "$3" -d "$5" -s '/sbin/nologin' "$1"
fi
else
useradd --prefix "$root" -rc "$4" -u "$2" -g "$3" -d "$5" -s '/sbin/nologin' "$1"
fi
passwd --prefix "$root" -l "$1" >/dev/null 2>&1
while [ $# -gt 5 ]; do
case "$6" in
locked) usermod --prefix "$root" -e 1 "$1" ;;
esac
shift
done
fi
}
update_login_defs() {
# update_login_defs <name> <id>
[ "$1" != '-' ] && warninvalid && return
min="${2%%-*}" max="${2#*-}"
[ "${max}" != "${max#*-}" ] && warninvalid && return
[ "${min}" -ge "${max}" ] && warninvalid "invalid range" && return
while read -r key val; do
case "${key}" in
SYS_UID_MAX) suid_max="${val}" ;;
SYS_GID_MAX) sgid_max="${val}" ;;
esac
done < "${root}/etc/login.defs"
[ "${min}" -lt "${suid_max}" ] && warninvalid "invalid range" && return
[ "${min}" -lt "${sgid_max}" ] && warninvalid "invalid range" && return
sed -e "/[GU]ID_MIN[[:space:]]\+/s/[^[:space:]]*$/${min}/" \
-e "/[GU]ID_MAX[[:space:]]\+/s/[^[:space:]]*$/${max}/" \
-i "${root}/etc/login.defs"
}
parse_file() {
while read -r conf; do
lineno=0
while read -r line; do
parse_string "${line}" "$((lineno += 1))"
done < "${conf}"
[ -n "${line}" ] && parse_string "${line}"
done
}
parse_string() {
[ -n "${1%%#*}" ] || return
full_line=$1
#eval "set -- $1" # do not use eval, see CVE-2021-40084
set -- $1
suffix="${1#?}"
type="${1%%${suffix}}" name="$2" id="$3" gecos="$4" home="$5"
# and now set the GECOS field without eval
if [ "${type}" = u ]; then
if [ ! -z "$4" ] && [ "$4" != '-' ]; then
# strip everything before the first "
gecosplus=${full_line#*\"}
# now strip everything after the last "
gecos=${gecosplus%\"*}
# check if there are other valid fields after GECOS
gecostest=$(echo $gecosplus | grep -o '".*' -)
if [ "$gecostest" = '"' ]; then
home=
else
set -- $gecostest
home=$2
fi
fi
fi
case "${type}" in
u)
uid=${id%%:*}
gid=${id##*:}
case "${uid}" in 65535|4294967295) warninvalid; return; esac
case "${gid}" in 65535|4294967295) warninvalid; return; esac
if [ "${uid}" != '-' ] && [ "${gid}" = '-' ]; then warninvalid; return; fi
[ "${home:--}" = '-' ] && home='/'
if [ "${uid}" = "${id}" ]; then
# No specific gid, create group for this user
add_group "${name}" "${id}"
fi
case "${suffix}" in
'!') locked=1;;
'') ;;
*) warninvalid; return;;
esac
add_user "${name}" "${uid}" "${gid}" "${gecos}" "${home}" ${locked:+locked}
;;
g)
case "${id}" in 65535|4294967295) warninvalid; return; esac
add_group "${name}" "${id}"
;;
m)
add_group "${id}" '-'
if id "${name}" >/dev/null 2>&1; then
usermod --prefix "$root" -a -G "${id}" "${name}"
else
useradd --prefix "$root" -r -g "${id}" -s '/sbin/nologin' "${name}"
passwd --prefix "$root" -l "${name}" >/dev/null 2>&1
fi
;;
r)
update_login_defs "${name}" "${id}"
;;
*) warninvalid; return ;;
esac
}
usage() {
printf '%s\n' \
"${0##*/}" '' \
"${0##*/} creates system users and groups, based on the file" \
'format and location specified in sysusers.d(5).' '' \
"Usage: ${0##*/} [OPTIONS...] [CONFIGFILE...]" '' \
'Options:' \
' --root=root All paths will be prefixed with the' \
' given alternate root path, including' \
' config search paths.' \
" --replace=PATH Don't run check in the package" \
' --inline Treat each positional argument as a' \
' separate configuration line instead of a' \
' file name.' \
' -h, --help Print a short help text and exit.' \
' --version Print a short version string and exit.'
exit "$1"
}
error=0 inline=0 replace='' root='' seen=''
# opensysusers is an implementation of sysusers.d spec without
# systemd command, it doesn't accept options or arguments
[ "${0##*/}" = opensysusers ] && set --
while [ "$#" -ne 0 ]; do
case "$1" in
--root=*) root="${1#--root=}" ;;
--root) root="$2"; shift ;;
--replace=*) replace="${1#--replace=}" ;;
--replace) replace="$2"; shift ;;
--inline) inline=1 ;;
--version) printf '%s\n' "${sysusersver}"; exit 0 ;;
-h|--help) usage 0 ;;
-[!-]|--?*) usage 1 ;;
--) shift; break ;;
*) break ;;
esac
shift
done
if [ "${inline}" -eq 0 ]; then
for file do
[ "${file}" = '--' ] && continue
for dir in etc run usr/lib; do
if [ -f "${root}/${dir}/sysusers.d/${file}" ]; then
sed -i -e '$a\' "${root}/${dir}/sysusers.d/${file}"
printf '%s/%s/sysusers.d/%s\n' "${root}" "${dir}" "${file}" |
parse_file
break
fi
done
done
else
for string in "$@"; do
parse_string "${string}"
done
fi
if [ "$#" -eq 0 ] || [ -n "${replace}" ]; then
set -- "${root}/etc/sysusers.d/"*.conf "${root}/run/sysusers.d/"*.conf \
"${root}/usr/lib/sysusers.d/"*.conf
for f do printf '%s %s\n' "${f##*/}" "${f%/*}"; done | sort -k1,1 |
while read -r b d; do
[ "${seen}" = "${seen#* ${b} }" ] && [ -f "${d}/${b}" ] &&
{ seen="${seen:- }${b} "; printf '%s/%s\n' "${d}" "${b}"; }
done | parse_file
fi
exit "${error}"
|
