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disable opportunistic encryption
[etc/mutt.git] / .mutt / sendmail-checks.d / ack-recipients
1 #!/bin/sh
2 #
3 # ack-recipients – require double-checking of some recipients
4 #
5 # refuse to send a mail as long as recipients listed in ~/.mutt/ack-recipients
6 # are not individually "signed-off" by adding their e-mail addresses to the
7 # X-Acked header. This header is removed from the mail before it is sent.
8 #
9 # The file ~/.mutt/ack-recipients stores sha256sums of lower-cased e-mail
10 # addresses (no newline) instead of the addresses themselves as a measure to
11 # protect privacy. You can get new lines like this:
12 #
13 #   printf my.new@e-mail.addre.ss | tr '[[:upper:]]' '[[:lower:]]' \
14 #     | sha256sum | sed -e 's, .*,,'
15 #
16 # E.g. my address (see below) will become
17 #   84d5b33c9376f67274c2ec9ce0e03b6973fb8bc943ebd7abb470c903c47e00f4
18 #
19 # Copyright © 2010 martin f. krafft <madduck@madduck.net>
20 # Released under the terms of the Artistic Licence 2.0
21 #
22 set -eu
23
24 CHECKLIST="$HOME/.mutt/ack-recipients"
25 HEADER=X-Acked
26 ACKED_RCPTS=$(formail -czx ${HEADER}: < $1 | tr -d ',' | tr '[[:upper:]]' '[[:lower:]]')
27 MAILFILE="$1"; shift
28
29 ret=0
30 for r in $@; do
31   ack=0
32   # check if this recipient is in the list of acked recipients
33   rl=$(printf $r | tr '[[:upper:]]' '[[:lower:]]')
34   for a in $ACKED_RCPTS; do [ $a = $rl ] && ack=1 && break; done
35   rs=$(printf $rl | sha256sum)
36   # now check if this unacked recipient needs to be acked
37   if [ $ack -eq 0 ] && grep -q "^${rs%% *}$" "$CHECKLIST"; then
38     echo >&2 "E: will not send mail until $r has been added to the $HEADER header"
39     ret=1
40   fi
41 done
42
43 [ $ret -eq 0 ] || exit $ret
44
45 # now remove the X-Acked header from the mail
46 TMPFILE=$(tempfile -p mutt-sendmail -s .msg)
47 settrap () { trap "$@" 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15; }
48 cleanup () { rm -f "$TMPFILE"; settrap -; }
49 settrap cleanup
50 formail -I ${HEADER}: < "$MAILFILE" > "$TMPFILE"
51 mv "$TMPFILE" "$MAILFILE"
52 settrap -