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several improvements

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timeout: the TLS ticket check has a timeout, so that early on non-reachable hosts
are determined. If it is running into the timeout, it quits early. The
timeout is configurable via environment e.g. TIMEOUT=16 ./ticketbleed.bash <host>

Also other ports are allowed albeit it probably it is of limited use

Supplying no arg is now more user-friendly
This commit is contained in:
Dirk 2017-06-09 12:45:22 +02:00
parent 15219475e9
commit 69fa8ca378
1 changed files with 41 additions and 9 deletions
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50
utils/ticketbleed.bash
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@ -8,19 +8,22 @@
#
###### DON'T DO EVIL! USAGE AT YOUR OWN RISK. DON'T VIOLATE LAWS! #######
readonly PS4='${LINENO}: ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
trap "cleanup" QUIT EXIT
[[ -z "$1" ]] && echo "IP is missing" && exit 1
[[ -z "$1" ]] && exit 1
readonly PS4='${LINENO}: ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
OPENSSL=${OPENSSL:-$(type -p openssl)}
TIMEOUT=${TIMEOUT:-20}
# insert some hexspeak here :-)
SID="x00,x00,x0B,xAD,xC0,xDE," # don't forget the trailing comma
NODE="$1"
NODE="${NODE%:*}" # strip port if supplied
PORT="443" # we curently support 443 only
PORT="${NODE#*:}"
PORT="${PORT-443}" # probably this doesn't make sense
NODE="${NODE%:*}" # strip port if supplied
TLSV=${2:-01} # TLS 1.0=x01 1.1=0x02, 1.2=0x3
MAXSLEEP=10
MAXSLEEP=$TIMEOUT
SOCKREPLY=""
COL_WIDTH=32
DEBUG=${DEBUG:-"false"}
@ -215,10 +218,17 @@ cleanup() {
get_sessticket() {
local sessticket_str
local output
sessticket_str="$(openssl s_client -connect $NODE:$PORT </dev/null 2>/dev/null | awk '/TLS session ticket:/,/^$/' | awk '!/TLS session ticket/')"
sessticket_str="$(sed -e 's/^.* - /x/g' -e 's/ .*$//g' <<< "$sessticket_str" | tr '\n' ',')"
sed -e 's/ /,x/g' -e 's/-/,x/g' <<< "$sessticket_str"
output="$($OPENSSL s_client -connect $NODE:$PORT </dev/null 2>/dev/null)"
if ! grep -qw CONNECTED <<< "$output"; then
return 1
else
sessticket_str="$(awk '/TLS session ticket:/,/^$/' <<< "$output" | awk '!/TLS session ticket/')"
sessticket_str="$(sed -e 's/^.* - /x/g' -e 's/ .*$//g' <<< "$sessticket_str" | tr '\n' ',')"
sed -e 's/ /,x/g' -e 's/-/,x/g' <<< "$sessticket_str"
return 0
fi
}
#### main
@ -229,13 +239,33 @@ early_exit=true
declare -a memory sid_detected
nr_sid_detected=0
# there are different "timeout". Check whether --preserve-status is supported
if type -p timeout &>/dev/null ; then
if timeout --help 2>/dev/null | grep -q 'preserve-status'; then
OPENSSL="timeout --preserve-status $TIMEOUT $OPENSSL"
else
OPENSSL="timeout $TIMEOUT $OPENSSL"
fi
else
echo " binary \"timeout\" not found. Continuing without it"
unset TIMEOUT
fi
echo
"$DEBUG" && ( echo )
echo "##### 1) Connect to determine 1x session ticket TLS"
# attn! neither here nor in the following client hello we do SNI. Assuming this is a vulnebilty of the TLS implementation
SESS_TICKET_TLS="$(get_sessticket)"
if [[ $? -ne 0 ]]; then
echo >&2
echo -e "$NODE:$PORT ${magenta}not reachable / no TLS${normal}\n " >&2
exit 0
fi
[[ "$SESS_TICKET_TLS" == "," ]] && echo -e "${green}OK, not vulnerable${normal}, no session tickets\n" && exit 0
trap "cleanup" QUIT EXIT
"$DEBUG" && ( echo; echo )
echo "##### 2) Sending 1 to 3 ClientHello(s) (TLS version 03,$TLSV) with this ticket and a made up SessionID"
@ -318,3 +348,5 @@ fi
exit 0
# vim:ts=5:sw=5