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[code/molly-guard.git] / run.d / 30-ask-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 if [ ${ALWAYS_QUERY_HOSTNAME:-0} -eq 1 ]; then
26   echo "I: $ME: $MOLLYGUARD_CMD is always molly-guarded on this system." >&2
27 else
28   # only run if we are being called over SSH, that is if the current terminal
29   # was created by sshd.
30   PTS=$(readlink /proc/$$/fd/0)
31   if ! pgrep -f "^sshd.+${PTS#/dev/}[[:space:]]*$" >/dev/null \
32     && [ -z "${SSH_CONNECTION:-}" ]; then
33       if [ $PRETEND_SSH -eq 1 ]; then
34         echo "I: $ME: this is not an SSH session, but --pretend-ssh was given..." >&2
35       else
36         exit 0
37       fi
38   else
39     echo "W: $ME: SSH session detected!" >&2
40   fi
41 fi
42
43 HOSTNAME="$(hostname --short)"
44
45 sigh()
46 {
47   echo "Good thing I asked; I won't $MOLLYGUARD_CMD $HOSTNAME ..." >&2
48   exit 1
49 }
50
51 trap 'echo;sigh' 1 2 3 9 10 12 15
52
53 echo -n "Please type in hostname of the machine to $MOLLYGUARD_CMD: "
54 read HOSTNAME_USER || :
55
56 [ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
57
58 trap - 1 2 3 9 10 12 15
59
60 exit 0