/usr/bin/mbsync-get-cert is in isync 1.3.0-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/bin/sh
#
# This script will extract the necessary certificate from the IMAP server
# It assumes that an attacker isn't trying to spoof you when you connect
# to the IMAP server! You're better off downloading the certificate
# from a trusted source.
#
# Copyright (C) 2003 Theodore Ts'o <tytso@alum.mit.edu>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
if [ $# != 1 ]; then
echo "Usage: $0 <host>" >&2
exit 1
fi
HOST=$1
seed=`date '+%s'`
try=0
while :; do
TMPDIR=/tmp/get-cert.$$.$seed
mkdir $TMPDIR 2> /dev/null && break
if [ $try = 1000 ]; then
echo "Cannot create temporary directory." >&2
exit 1
fi
try=`expr $try + 1`
seed=`expr \( \( $seed \* 1103515245 \) + 12345 \) % 2147483648`
done
TMPFILE=$TMPDIR/get-cert
ERRFILE=$TMPDIR/get-cert-err
CERTFILE=$TMPDIR/cert
echo QUIT | openssl s_client -connect $HOST:993 -showcerts \
> $TMPFILE 2> $ERRFILE
sed -e '1,/^-----BEGIN CERTIFICATE-----/d' \
-e '/^-----END CERTIFICATE-----/,$d' < $TMPFILE > $CERTFILE
if test -s $CERTFILE ; then
echo -----BEGIN CERTIFICATE-----
cat $CERTFILE
echo -----END CERTIFICATE-----
else
echo "Couldn't retrieve certificate. openssl reported the following errors:"
cat $ERRFILE
fi
rm -r $TMPDIR
|