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#!/bin/bash
# Connects to a SSL host for a list of ciphers
# Author: Peter Wu <lekensteyn@gmail.com>
host=${1:-localhost}
portbase=${2:-4430}
s_client_client_random() {
awk '
# match Master-Key from SSL Session dump
/Master-Key:/{key=$2}
# start matching bytes when requested
l > 0 {
b=1;e=16;
if(l==3)b=7;
if(l==1)e=6;
for (i = b; i <= e; i++)
s=s$i;
# at the end, save random value in map r
if (l--==1)
queued[s] = 1;
}
# Match block containing Crandom bytes (over three lines)
/ ClientHello|ServerHello$/{l=3;s=""}
# whenever a key and random is available, print it. This allows the random
# to be known before the connection is finished.
key {
for (rnd in queued) {
has_random = 1;
print "CLIENT_RANDOM", rnd, key
delete queued[rnd];
}
fflush();
}
END {
for (rnd in queued) {
print "# No master key for random", rnd
}
# should not be possible since the first thing we sent out is a
# ClientHello, but just to be sure...
if (!has_random) {
if (key)
print "# No random found for key", key
else
print "# No random nor key found"
}
}'
}
# When stdin is a TTY, try all ciphers
if [ -t 0 ]; then
openssl ciphers -V
else
# otherwise if not TTY, pass-through (useful for grep)
cat
fi |
awk '# Look for something like ECDHE-RSA-AES256-SHA
{
for (i = 1; i <= NF; i++) {
if ($i ~ /.-./) {
print $i;
break
}
}
}' |
while read cipher; do
case $cipher in
*-ECDSA-*)
port=$((portbase+1)) ;;
ECDH-RSA-*)
port=$((portbase+2)) ;;
*-DSS-*)
port=$((portbase+3)) ;;
PSK-*)
echo "Skipping unsupported PSK" >&2
continue
;;
*-RSA-*|*) # assume RSA (includes name like RC4-SHA)
port=$portbase ;;
esac
echo "# Cipher Suite $cipher"
# It is expected that the other side closes the connection
printf "GET / HTTP/1.0\r\n\r\n" |
openssl s_client -connect "$host:$port" -ign_eof -cipher "$cipher" \
-msg 2>&1 | s_client_client_random
done
# vim: set et sw=4 ts=4:
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