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|
#!/bin/sh
# Copyright (c) 2020 Kimmo Suominen <kim@netbsd.org>
# Copyright (c) 2022–2026 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
readonly PROG="${0##*/}"
umask 022
DOAS_CONF=@DOAS_CONF@
doas_conf_mode="0600"
if [ $(id -u) -eq 0 ]
then
EDIT="${VISUAL:-${EDITOR:-vi}}"
else
EDIT=doasedit
fi
warn()
{
echo "$PROG: $@" >&2
}
err()
{
warn "$@"
exit 1
}
usage()
{
err "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
-*)
err "invalid filename: $DOAS_CONF"
;;
esac
doas_conf_dir="$(dirname "$DOAS_CONF")"
doas_conf_base="$(basename "$DOAS_CONF")"
DOAS_CONF="$doas_conf_dir/$doas_conf_base"
doas_lock_file="$DOAS_CONF.lock"
[ ! -e "$doas_conf_dir" ] && err "$doas_conf_dir does not exist"
[ ! -d "$doas_conf_dir" ] && err "$doas_conf_dir is not a directory"
[ ! -w "$doas_conf_dir" ] && {
owner="$(stat -c %U "$doas_conf_dir")"
err "$doas_conf_dir is not writable"
}
tmp_doas="$(mktemp -t vidoas.XXXXXXXX)" || exit 1
set_trap_rm "$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="$(mktemp -t vidoas.XXXXXXXX)"
set_trap_rm "$tmp_doas" "$tmp_test_ln"
ln "$tmp_doas" "$tmp_test_ln" 2>/dev/null &&
err 'ln(1) is not safe for creating lock files, bailing'
# If a doas.conf file exists, copy it into the temporary file for
# editing. If none exist, the editor will open with an empty file.
if [ -f "$DOAS_CONF" ]
then
if [ -r "$DOAS_CONF" ]
then
cp "$DOAS_CONF" "$tmp_doas"
else
err "$DOAS_CONF is not readable"
fi
fi
if $noop
then
doas -C "$DOAS_CONF" || err "$DOAS_CONF contains syntax errors"
warn 'ok; prerequisite checks passed'
exit 0
fi
# Link the temporary file to the lock file.
if ln "$tmp_doas" "$doas_lock_file"
then
set_trap_rm "$tmp_doas" "$tmp_test_ln" "$doas_lock_file"
else
err "$DOAS_CONF is already locked"
fi
# Some versions of vi(1) exit with a code that reflects the number of
# editing errors made. This is why we ignore the exit code from the
# editor.
"$EDIT" "$tmp_doas" || true
until doas -C "$tmp_doas"
do
warn "press enter to edit doas.conf again and fix it,"
warn "or $(get_intr) to cancel."
read _
"$EDIT" "$tmp_doas" || true
done
if [ -s "$tmp_doas" ]
then
if cmp -s "$tmp_doas" "$DOAS_CONF"
then
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
|
