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#!/bin/bash
ua_set_vars () {
ua_set_vars () {
:
}
if [ -z "$MLTK_INSTALL" ]; then
# regular mltk mode, copy the current user-related files to TARGET_BUILD_DIR
if [ -z "$TARGET_BUILD_DIR" ] || [ "$TARGET_BUILD_DIR" == "/" ]; then
perror "Almost wrecked your local passwd, group and shadow file. phew."
fi
local prefix=0
command useradd --help 2>&1 | grep -q -- "--prefix" && prefix=1
declare -rg _PASSWD="${TARGET_BUILD_DIR}/etc/passwd"
declare -rg _GROUP="${TARGET_BUILD_DIR}/etc/group"
declare -rg _SHADOW="${TARGET_BUILD_DIR}/etc/shadow"
if (( prefix == 0 )); then
declare -rga _USER_EXTRA_OPTS=( "--root" "$TARGET_BUILD_DIR" )
else
declare -rga _USER_EXTRA_OPTS=( "--prefix" "$TARGET_BUILD_DIR" )
fi
# prepare files
[ -s "${_PASSWD}" ] && [ -s "${_GROUP}" ] && [ -s "${_SHADOW}" ] && return
pinfo "Creating users and groups based on local system...."
mkdir -p "${_PASSWD%/*}" || perror "Could not mkdir '${_PASSWD%/*}'."
cp -a "/etc/passwd" "$_PASSWD" || perror "Could not copy /etc/passwd"
cp -a "/etc/group" "$_GROUP" || perror "Could not copy /etc/group"
# remove local users from group file (TODO: currently assumes users have ids 1000-1999)
local LOCALUSERS=$( awk -F ':' '$3 >= 1000 && $3 < 2000 {print $1}' "${_PASSWD}" )
local USER
for USER in $LOCALUSERS; do
sed -r -i "s/([:,])${USER}(,|$)/\1/g;s/,$//" "${_GROUP}"
done
# remove all non-system groups (also assumes users have 1000-1999, so nogroup will be kept)
awk -F ':' '$3 < 1000 || $3 >= 2000' "${_GROUP}" > "${_GROUP}.tmp"
mv -f "${_GROUP}.tmp" "${_GROUP}" || perror "Move error ($_GROUP)"
# same for users...
awk -F ':' '$3 < 1000 || $3 >= 2000' "${_PASSWD}" > "${_PASSWD}.tmp"
mv -f "${_PASSWD}.tmp" "${_PASSWD}" || perror "Move error ($_PASSWD)"
# generate fresh shadow file
awk -F ':' '{print $1":*:15555:0:99999:7:::"}' "${_PASSWD}" > "${_SHADOW}"
# make sure shadow has group shadow
chgrp shadow "$_SHADOW"
chmod 0640 "$_SHADOW"
if (( prefix == 0 )); then
# all user-related tools that support "--root" option require nss libs in the
# chroot target, thus we need to copy the libs over there.
tarcopy "$(find /lib /lib64 /usr/lib /usr/lib64 -maxdepth 4 -name "libnss_files*")" "$TARGET_BUILD_DIR"
fi
else
declare -rg _PASSWD="/etc/passwd"
declare -rg _GROUP="/etc/group"
declare -rg _SHADOW="/etc/shadow"
declare -rga _USER_EXTRA_OPTS=()
fi
}
useradd () {
ua_set_vars
declare -a opts=( "$@" )
local _uid _gid name _nuid
local sys=0
local uid=
local gid=
local mkgrp=0
local pw="#"
while [ $# -gt 0 ]; do
name="$1"
case "$1" in
--root|-R) perror "Must not use --root" ;;
--prefix|-P) perror "Must not use --prefix" ;;
--system|-r) sys=1 ;;
--uid|-u) uid="$2"; shift ;;
--gid|-g) gid="$2"; shift ;;
--user-group|-U) mkgrp=1 ;;
--password|-p) pw="$2"; shift ;;
esac
shift
done
# Existing user id, if any
_nuid="$( getuid "$name" )"
# Group checks
if (( mkgrp == 1 )); then
[ -n "$gid" ] && perror "$name: Cannot use -U and -g at the same time"
_gid="$( getgid "$name" )"
elif [ -n "$gid" ]; then
_gid="$( getgid "$gid" )"
[ -z "$_gid" ] && perror "$name: Cannot create user and add to $gid: Group not found"
fi
# User checks
if [ -n "$uid" ]; then
_uid="$( getuid "$uid" )"
[ -n "$_uid" ] && [ "$_uid" != "$uid" ] && perror "$name: Requested uid already taken"
[ -n "$_nuid" ] && [ "$_nuid" != "$uid" ] && perror "$name: User already exists with $_nuid"
elif (( sys == 1 )) && [ -n "$_nuid" ] && (( _nuid >= 1000 )); then
perror "$name: Requested as system user, but already has $_nuid"
elif (( sys == 0 )) && [ -n "$_nuid" ] && (( _nuid < 1000 )); then
perror "$name: Requested as normal user, but already has $_nuid"
fi
if [ -n "$_nuid" ]; then
[ -n "$_gid" ] && [ "$( getusergroup "$name" )" != "$_gid" ] && perror "$name: Exists with group != $_gid"
[ "$pw" != "#" ] && usr_setpw "$name" "$pw"
return 0 # Nothing to do
fi
command useradd "${_USER_EXTRA_OPTS[@]}" "${opts[@]}" || perror "useradd failed"
[ "$pw" != "#" ] && usr_setpw "$name" "$pw"
}
groupadd () {
ua_set_vars
declare -a opts=( "$@" )
local name _ngid
local sys=0
local gid=
while [ $# -gt 0 ]; do
name="$1"
case "$1" in
--root|-R) perror "Must not use --root" ;;
--prefix|-P) perror "Must not use --prefix" ;;
--system|-r) sys=1 ;;
--gid|-g) gid="$2"; shift ;;
esac
shift
done
# Existing group id, if any
_ngid="$( getgid "$name" )"
if [ -n "$gid" ]; then # Want specific gid
_gid="$( getgid "$gid" )"
if [ -n "$_gid" ]; then # Requested gid exists
[ -n "$_ngid" ] && (( _gid == _ngid )) && return 0 # Nothing to do
perror "$name: gid $_gid already taken"
fi
elif [ -n "$_ngid" ]; then
(( sys == 1 && _ngid >= 1000 )) && perror "$name: Already exists with non-system id $_ngid"
(( sys == 0 && _ngid < 1000 )) && perror "$name: Already exists with system id $_ngid"
return 0
fi
command groupadd "${_USER_EXTRA_OPTS[@]}" "${opts[@]}" || perror "groupadd failed"
}
# Get numeric ID of given user (name or ID)
getuid () {
awk -F ':' -v p="$1" -v n= '{if ($1 == p) n = $3; if (n == "" && $3 == p) n = $3;}END{if (length(n)) print n}' "$_PASSWD"
}
# Get numeric ID of given group (name or ID)
getgid () {
awk -F ':' -v p="$1" -v n= '{if ($1 == p) n = $3; if (n == "" && $3 == p) n = $3;}END{if (length(n)) print n}' "$_GROUP"
}
# Get numeric ID of primary group of given user (name or ID)
getusergroup () {
awk -F ':' -v p="$1" -v n= '{if ($1 == p) n = $4; if (n == "" && $4 == p) n = $3;}END{if (length(n)) print n}' "$_PASSWD"
}
# usr_setpw username password
usr_setpw () {
local PW=
local pw="$2"
if [ -z "$pw" ]; then
PW="*"
elif [ "${pw:0:1}" != '$' ] || [ "${pw:2:1}" != '$' ]; then
PW="$( mkpasswd -m sha-512 "${pw}" )"
[ -z "${PW}" ] && PW="$( openssl passwd -6 "${pw}" )"
[ -z "${PW}" ] && PW="$( openssl passwd -1 "${pw}" )"
[ -z "${PW}" ] && perror "Error generating hashed password for $1"
else
PW="$pw"
fi
local s r
s="$( sed -r 's~[\[{(*+/^$?\\]~\\&~g' <<<"$1" )"
r="$( sed -r 's~[&/\\]~\\&~g' <<<"$1:$PW" )"
sed -i -r "s/$s:[^:]*:/$r:/" "${_SHADOW}"
}
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