summaryrefslogtreecommitdiff
path: root/tor-exit-ssl-check-many
blob: ea8986d21b161c8c3dfd4a9283a890b21c208408 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
#!/bin/bash

# Copyright (c) 2013 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

usage() {
  echo "Usage: $0 [<options>] <target> [<target> ...]"
  echo "Options:"
  echo "  -a <auth>  use this authority [$AUTH]"
  echo "  -l <dir>   log dir [$LOGDIR]"
  echo "  -m         send mail when a certificate mismatch is found"
  echo "  -v         be a bit verbose"
  echo "  -h         print this help"
}


TORPID=""
CHECKDIR=""

cleanup() {
	[ -z "$TORPID" ] || kill "$TORPID" || true
	[ -z "$CHECKDIR" ] || rm -rf "$CHECKDIR" || true
}



AUTH=tor.noreply.org
PER_RUN=60
DEFAULT_CHECKHOSTS="www.torproject.org"
LOGDIR="tor-exit-ssl-check-many.log"
CACHEDIR="tor-exit-ssl-check-many.cache"
MAIL=0
CHECKDIR=$(mktemp -d "/tmp/cert-check-many-XXXXXX")
DUMPFILE="$CHECKDIR/dump"
trap 'cleanup' EXIT

mkdir -vp "$LOGDIR"
mkdir -vp "$CACHEDIR"

LOG="$LOGDIR/log"
CTR=0
HOSTNAME=$(hostname)
VERBOSE=0
while getopts "vha:l:m" OPTION
do
  case "$OPTION" in
    v)
      VERBOSE=$((VERBOSE + 1))
      ;;
    h)
      usage
      exit 0
      ;;
    a)
      AUTH="$OPTARG"
      ;;
    l)
      LOGDIR="$OPTARG"
      ;;
    m)
      MAIL=1
      ;;
    *)
      usage >&2
      exit 1
  esac
done
shift $(($OPTIND - 1))

if [ "${1:-}" = "--help" ]; then
  usage
  exit 0
fi

declare -a CHECKHOSTS=("$@")
if [ "${#CHECKHOSTS[@]}" = 0 ]; then
  for i in $DEFAULT_CHECKHOSTS; do
    CHECKHOSTS[${#CHECKHOSTS[@]}]="$i"
  done
fi

run_some_checks() {
  local idx=$(( RANDOM % ${#CHECKHOSTS[@]} ))
  local host="${CHECKHOSTS[$idx]}"
  wget -q -O - "http://$AUTH"/tor/status-vote/current/consensus | \
    grep -v BadExit | grep '^s .*Exit' -B1 |\
    awk '$1 == "r" {print $3}' |\
    sort -R | \
    head -n "$PER_RUN" | \
    while read fpr; do
      [ "$VERBOSE" = 0 ] || echo -n "[$(TZ=UTC date +%Y-%m-%dT%H:%M:%SZ)] Checking $host at $fpr..."
      if timeout 600 tor-exit-ssl-check -c "$CACHEDIR" -C "$CONTROLSOCKET" "$fpr" $host > "$DUMPFILE" 2>&1; then
        ecode=0
      else
        ecode="$?"
      fi
      [ "$VERBOSE" = 0 ] || echo "$ecode"
      prefix="[$(TZ=UTC date +%Y-%m-%dT%H:%M:%SZ)][$fpr][EC=$ecode]"
      case "$ecode" in
        0) echo "$prefix OK" >> "$LOG";;
        2) echo "$prefix connect failed" >> "$LOG";;
        4) echo "$prefix handshake failed" >> "$LOG";;
        8) lf="$LOGDIR/$(date +%s).$HOSTNAME.$$.$CTR"
           echo "$prefix differences - logged as $lf" >> "$LOG"
           CTR=$((CTR + 1))
           echo "$fpr" > "$lf"
           echo >> "$lf"
           cat "$DUMPFILE" >> "$lf"
           echo >> "$lf"
           wget -q -O - http://"$AUTH"/tor/server/fp/$(echo "$fpr" | perl -MMIME::Base64 -e "print unpack(\"H*\", decode_base64(<>)),\"\n\"") >> "$lf"
           if [ "$MAIL" -gt 0 ]; then
             (echo "Log file at $lf:"; echo; cat "$lf") | mail -s "certificate mismatch found for relay $fpr" "$USER"
           fi
           ;;
        124) echo "$prefix timeout!" >> "$LOG";;
        *)
           echo "$prefix unknown exit code" >> "$LOG"
           echo "$prefix unknown exit code" >&2
           cp $DUMPFILE "$LOGDIR/failed-output"
           exit 1
      esac
    done
}


start_tor() {
	local pidfile="$CHECKDIR/pid"

	if command -v tor > /dev/null; then
		tor="tor"
	elif [ -x /usr/sbin/tor ]; then
		tor="/usr/sbin/tor"
	else
		echo >&2 "Cannot find tor executable"
		exit 1
	fi

	local datadir="$CHECKDIR/tor"
	CONTROLSOCKET="$CHECKDIR/sock"
	cat > "$CHECKDIR/torrc" << EOF
DataDirectory $datadir
RunAsDaemon 1
SocksPort auto
PidFile $pidfile
SafeLogging 0
ControlSocket $CONTROLSOCKET
StrictNodes 1
EOF

	mkdir -p -m 0700 "$datadir"
	"$tor" --hush -f "$CHECKDIR/torrc"
	TORPID="$(cat $pidfile)"
}

start_tor
while : ; do
  run_some_checks
  sleep 60
done