Script that can be used to extract the server's certificate from an IMAP

server.

get-cert

@@ -0,0 +1,42 @@
+#!/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+HOST=$1
+TMPFILE=/tmp/get-cert.$$
+ERRFILE=/tmp/get-cert-err.$$
+CERTFILE=/tmp/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
+/bin/rm -f $TMPFILE $ERRFILE $CERTFILE