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|
#!/bin/sh
# Copyright (c) 2020 Kimmo Suominen <kim@netbsd.org>
# Copyright (c) 2022 Thomas Voss <mail@thomasvoss.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
# AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
# DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
# OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
# TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
# Edit a temporary copy of the doas.conf file and check it for syntax
# errors before installing it as the actual doas.conf file.
set -eu
PATH=/bin:/usr/bin:/usr/local/bin
export PATH
PROG="${0##*/}"
umask 022
DOAS_CONF=@DOAS_CONF@
doas_conf_mode="0600"
[ $(id -u) -eq 0 ] && EDIT="${VISUAL:-${EDITOR:-vi}}" || EDIT=doasedit
warn() { echo "$PROG: $@" >&2; }
die() { rv=$1; shift; warn "$@"; exit $rv; }
usage() { die 1 "Usage: $PROG [-n] [file]"; }
get_intr() {
stty -a | sed -En '
/^(.* )?intr = / {
s///
s/;.*$//
p
}'
}
set_trap_rm() {
local file files
files=
for file in "$@"; do
files="$files '$file'"
done
[ -n "$files" ] && trap "rm -f $files" EXIT HUP INT TERM
}
noop=0
while getopts n c; do
case "$c" in
n) noop=$(($noop + 1)) ;;
*) usage ;;
esac
done
shift $(($OPTIND - 1))
case $# in
0) ;;
1) DOAS_CONF="$1" ;;
*) usage ;;
esac
case $noop in
0) noop=false ;;
1) noop=true ;;
*) noop=true; exec >/dev/null 2>&1 ;;
esac
case "$DOAS_CONF" in
-*)
warn "Invalid filename: $DOAS_CONF"
die 1 "Try using './$DOAS_CONF' instead"
;;
esac
doas_conf_dir="$(dirname "$DOAS_CONF")"
doas_conf_base="$(basename "$DOAS_CONF")"
DOAS_CONF="$doas_conf_dir/$doas_conf_base"
doas_lock_file="$DOAS_CONF.lock"
# These checks are only for producing nicer diagnostic messages to the
# user. They are not relied on by the rest of the code.
[ ! -e "$doas_conf_dir" ] && die 1 "$doas_conf_dir does not exist"
[ ! -d "$doas_conf_dir" ] && die 1 "$doas_conf_dir is not a directory"
[ ! -w "$doas_conf_dir" ] && {
owner="$(stat -c %U "$doas_conf_dir")"
warn "$doas_conf_dir is not writable"
die 1 "You probably need to run $PROG as $owner"
}
tmp_doas="$(mktemp --tmpdir vidoas.XXXXXXXXXX)" \
|| die 1 "You probably need to run $PROG as root"
set_trap_rm "$tmp_doas"
# It is important that the ln(1) command fails if the target already
# exists. Some versions are known to behave like "ln -f" by default
# (removing any existing target). Adjust PATH to avoid such ln(1)
# implementations.
tmp_test_ln="$(mktemp --tmpdir vidoas.XXXXXXXXXX)"
set_trap_rm "$tmp_doas" "$tmp_test_ln"
ln "$tmp_doas" "$tmp_test_ln" 2>/dev/null \
&& die 1 'ln(1) is not safe for creating lock files, bailing'
# If a doas.conf file exists, copy it into the temporary file for
# editing. If none exist, the editor will open with an empty file.
[ -f "$DOAS_CONF" ] && {
if [ -r "$DOAS_CONF" ]; then
cp "$DOAS_CONF" "$tmp_doas"
else
die 1 "$DOAS_CONF is not readable"
fi
}
$noop && {
doas -C "$DOAS_CONF" || die 1 "$DOAS_CONF contains syntax errors."
die 0 'OK: Prerequisite checks passed'
}
# Link the temporary file to the lock file.
if ln "$tmp_doas" "$doas_lock_file"; then
set_trap_rm "$tmp_doas" "$tmp_test_ln" "$doas_lock_file"
else
die 1 "$DOAS_CONF is already locked"
fi
# Some versions of vi(1) exit with a code that reflects the number of
# editing errors made. This is why we ignore the exit code from the
# editor.
"$EDIT" "$tmp_doas" || true
until doas -C "$tmp_doas"; do
warn "Press enter to edit doas.conf again to fix it,"
warn "or ($(get_intr)) to cancel."
read _
"$EDIT" "$tmp_doas" || true
done
# Use mv(1) to rename the temporary file to doas.conf as it is atomic.
# Update: No longer use mv as it messes up permissions on the doas.conf file.
# Use install with ownership set to root.
if [ -s "$tmp_doas" ]; then
if cmp -s "$tmp_doas" "$DOAS_CONF"; then
warn "No changes made"
warn "$DOAS_CONF unchanged"
else
install -o root -m "$doas_conf_mode" "$tmp_doas" \
"$DOAS_CONF" \
&& warn "$DOAS_CONF updated"
fi
else
warn "Not installing an empty doas.conf file"
warn "$DOAS_CONF unchanged"
fi
|
