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fix sshd detection for ControlMaster connections
[code/molly-guard.git] / run.d / 30-query-hostname
1 #!/bin/sh
2 #
3 # 30-ask-hostname - request the user to type in the hostname of the local host
4 #
5 # Copyright © martin f. krafft <madduck@madduck.net>
6 # Released under the terms of the Artistic Licence 2.0
7 #
8 set -eu
9
10 ME=molly-guard
11
12 [ -f "$MOLLYGUARD_SETTINGS" ] && . "$MOLLYGUARD_SETTINGS"
13
14 PRETEND_SSH=0
15 for arg in "$@"; do
16   case "$arg" in
17     (*-pretend-ssh) PRETEND_SSH=1;;
18   esac
19 done
20
21 # require an interactive terminal connected to stdin
22 test -t 0 || exit 0
23
24 # we've been asked to always protect this host
25 case "${ALWAYS_QUERY_HOSTNAME:-0}" in
26   0|false|False|no|No|off|Off)
27     # only run if we are being called over SSH, that is if the current terminal
28     # was created by sshd.
29     PTS=$(readlink /proc/$$/fd/0)
30     if ! pgrep -f "^sshd.+${PTS#/dev/}\>" >/dev/null \
31       && [ -z "${SSH_CONNECTION:-}" ]; then
32         if [ $PRETEND_SSH -eq 1 ]; then
33           echo "I: $ME: this is not an SSH session, but --pretend-ssh was given..." >&2
34         else
35           exit 0
36         fi
37     else
38       echo "W: $ME: SSH session detected!" >&2
39     fi
40     ;;
41   *)
42     echo "I: $ME: $MOLLYGUARD_CMD is always molly-guarded on this system." >&2
43     ;;
44 esac
45
46 HOSTNAME="$(hostname --short)"
47
48 sigh()
49 {
50   echo "Good thing I asked; I won't $MOLLYGUARD_CMD $HOSTNAME ..." >&2
51   exit 1
52 }
53
54 trap 'echo;sigh' 1 2 3 9 10 12 15
55
56 echo -n "Please type in hostname of the machine to $MOLLYGUARD_CMD: "
57 read HOSTNAME_USER || :
58
59 [ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
60
61 trap - 1 2 3 9 10 12 15
62
63 exit 0