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#!/bin/sh
#
# $NetBSD: creds_msdos,v 1.5 2021/12/11 19:24:18 mrg Exp $
#
# Copyright (c) 2019 Matthew R. Green
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# If "creds_msdos_partition" is an msdos partition and has a creds.txt
# in it, perform these commands:
# "sshkeyfile <user> <path on msdos>"
# "sshkey <user> <entry>"
# "useraddhash <user> <passwd hash>"
# "useradd <user> <passwd>"
# If the "useradd" method is used, this the creds.txt file will be
# shredded and deleted with rm -P.
# PROVIDE: creds_msdos
# REQUIRE: mountall
$_rc_subr_loaded . /etc/rc.subr
name="creds_msdos"
start_cmd="creds_msdos_start"
stop_cmd=":"
fail() {
echo "$@" 1>&2
exit 1
}
# This uses $ssh_userkeys global
sshkey_setup() {
local user="$1"
local group="wheel"
# don't create existing users
if ! id -u "${user}" > /dev/null 2>&1; then
useradd -m -G "${group}" "${user}" || fail "Useradd failed."
fi
eval ssh_userdir=~"${user}/.ssh"
mkdir -p -m 755 "${ssh_userdir}" || fail "mkdir ~/.ssh failed."
chmod 755 "${ssh_userdir}"
chown "${user}" "${ssh_userdir}"
ssh_userkeys="${ssh_userdir}/authorized_keys"
}
sshkey_finish() {
local user="$1"
chmod 644 "${ssh_userkeys}"
chown "${user}" "${ssh_userkeys}"
}
do_sshkeyfile() {
local user="$1"
local newkeys="${creds_msdos_partition}/$2"
if [ ! -f "${newkeys}" ]; then
return
fi
sshkey_setup "${user}"
# check entry is not present
while read type keydata name; do
if fgrep -q "${keydata}" "${ssh_userkeys}" 2>/dev/null; then
continue
fi
echo "${type} ${keydata} ${name}" >> "${ssh_userkeys}"
done < "${newkeys}"
sshkey_finish "${user}"
}
do_sshkey() {
local user="$1"
local newkey="$2"
sshkey_setup "${user}"
echo "${newkey}" >> "${ssh_userkeys}"
sshkey_finish "${user}"
}
do_useraddpwhash() {
local user="$1"
local pwhash="$2"
local group="wheel"
# don't add to existing users
if id -u "${user}" > /dev/null 2>&1; then
return
fi
useradd -m -p "${pwhash}" -G "${group}" "${user}" || fail "Useradd failed."
}
do_useradd() {
local user="$1"
local password="$2"
local pwhash=$(pwhash "$password")
do_useraddpwhash "${user}" "${pwhash}"
}
creds_msdos_start()
{
local fstab_file=/etc/fstab
if [ -z "${creds_msdos_partition}" ]; then
echo "Not looking for credentials on msdos"
return
fi
while read junk1 mp fstype junk2; do
if [ "${mp}" != "${creds_msdos_partition}" ]; then
continue
fi
if [ "${fstype}" != "msdos" ]; then
echo "Not checking for creds on ${creds_msdos_partition}: not an msdos file system"
return
fi
break
done < "${fstab_file}"
local delete_creds=no
local creds_file="${creds_msdos_partition}/creds.txt"
if [ -f "${creds_file}" ]; then
while read type user args; do
# strip cr
local clean_args=$(echo "$args" | tr -d '\015')
case "$type" in
\#*|'')
continue
;;
sshkeyfile)
echo "Added user ${user} via ssh key file method."
do_sshkeyfile "${user}" "${clean_args}"
;;
sshkey)
echo "Added user ${user} via ssh key string method."
do_sshkey "${user}" "${clean_args}"
;;
useraddpwhash)
echo "Added user ${user} via password hash method."
do_useraddpwhash "${user}" "${clean_args}"
;;
useradd)
echo "Added user ${user} via password method, shredding credentials file."
do_useradd "${user}" "${clean_args}"
delete_creds=yes
;;
*)
echo "Do not understand '$type' creds" 1>&2
exit 1
;;
esac
done < "${creds_file}"
fi
if [ $delete_creds = yes ]; then
rm -P -f "${creds_file}"
fi
}
load_rc_config $name
run_rc_command "$1"
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