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+#!/bin/sh
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+#
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+# This script will extract the necessary certificate from the IMAP server
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+# It assumes that an attacker isn't trying to spoof you when you connect
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+# to the IMAP server! You're better off downloading the certificate
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+# from a trusted source.
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+#
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+# Copyright (C) 2003 Theodore Ts'o <tytso@alum.mit.edu>
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program; if not, write to the Free Software
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+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+#
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+
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+HOST=$1
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+TMPFILE=/tmp/get-cert.$$
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+ERRFILE=/tmp/get-cert-err.$$
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+CERTFILE=/tmp/cert.$$
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+
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+echo QUIT | openssl s_client -connect $HOST:993 -showcerts \
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+ > $TMPFILE 2> $ERRFILE
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+sed -e '1,/^-----BEGIN CERTIFICATE-----/d' \
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+ -e '/^-----END CERTIFICATE-----/,$d' < $TMPFILE > $CERTFILE
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+
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+if test -s $CERTFILE ; then
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+ echo -----BEGIN CERTIFICATE-----
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+ cat $CERTFILE
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+ echo -----END CERTIFICATE-----
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+else
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+ echo "Couldn't retrieve certificate. Openssl reported the following errors"
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+ cat $ERRFILE
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+fi
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+/bin/rm -f $TMPFILE $ERRFILE $CERTFILE
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Theodore Ts'o