#!/bin/bash

# nagios-check-tor-authority-cert - check certificate expiry time

# A nagios check for Tor v3 directory authorities:
# - Checks the current certificate expiry time
#
# Usage: nagios-check-tor-authority-cert <authority identity fingerprint>
# e.g.: nagios-check-tor-authority-cert A9AC67E64B200BBF2FA26DF194AC0469E2A948C6

# Copyright (c) 2008 Peter Palfrader <peter@palfrader.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


set -e
set -u

if [ -z "${1:-}" ]; then
	echo "Usage: $0 <authority identity fingerprint>" 2>&1
	exit 3
fi

identity="$1"

DIRSERVERS=""
DIRSERVERS="$DIRSERVERS 86.59.21.38:80"         # tor26
DIRSERVERS="$DIRSERVERS 128.31.0.34:9031"       # moria1
DIRSERVERS="$DIRSERVERS 216.224.124.114:9030"   # ides
DIRSERVERS="$DIRSERVERS 80.190.246.100:80"      # gabelmoo
#DIRSERVERS="$DIRSERVERS 140.247.60.64:80"      # lefkada
DIRSERVERS="$DIRSERVERS 194.109.206.212:80"     # dizum
DIRSERVERS="$DIRSERVERS 213.73.91.31:80"        # dannenberg

TMPFILE=$(mktemp)
trap 'rm -f "$TMPFILE"' 0

for dirserver in $DIRSERVERS; do
	if wget -q -O "$TMPFILE" "http://$dirserver/tor/keys/fp/$identity"
        then
		break
	else
		cat /dev/null > "$TMPFILE"
		continue
	fi
done

if ! [ -s "$TMPFILE" ] ; then
	echo "UNKNOWN: Downloading certificate for $identity failed."
	exit 3
fi

expirydate="$(awk '$1=="dir-key-expires" {printf "%s %s", $2, $3}' < "$TMPFILE")"
expiryunix=$(TZ=UTC date -d "$expirydate" +%s)
now=$(date +%s)

if [ "$now" -ge "$expiryunix" ]; then
	echo "CRITICAL: Certificate expired $expirydate (authority $identity)."
	exit 2
elif [ "$(( now + 7*24*60*60 ))" -ge "$expiryunix" ]; then
	echo "CRITICAL: Certificate expires $expirydate (authority $identity)."
	exit 2
elif [ "$(( now + 30*24*60*60 ))" -ge "$expiryunix" ]; then
	echo "WARNING: Certificate expires $expirydate (authority $identity)."
	exit 1
else
	echo "OK: Certificate expires $expirydate (authority $identity)."
	exit 0
fi