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Merge pull request #499 from dcooper16/get_full_server_response

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Add option to retrieve entire server response
This commit is contained in:
Dirk Wetter
2016-11-03 13:12:16 +01:00
committed by GitHub
parent f1d609e008 80d9f418d0
commit 82dbb23cab
1 changed files with 151 additions and 4 deletions
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testssl.sh
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@@ -5761,10 +5761,98 @@ parse_sslv2_serverhello() {
return $ret
}
# Return 0 if arg1 contains the entire server response, 1 if it does not, and 2 if the response is malformed.
# Return 3 if the response version is TLS 1.3 and the entire ServerHello has been received, since any remaining
# portion of the response will be encrypted.
# arg1: ASCII-HEX encoded reply
check_tls_serverhellodone() {
local tls_hello_ascii="$1"
local tls_handshake_ascii="" tls_alert_ascii=""
local -i i tls_hello_ascii_len tls_handshake_ascii_len tls_alert_ascii_len
local -i msg_len remaining
local tls_content_type tls_protocol tls_handshake_type tls_msg_type
local tls_err_level
# arg1: name of file with socket reply
DETECTED_TLS_VERSION=""
if [[ -z "$tls_hello_ascii" ]]; then
return 0 # no server hello received
fi
tls_hello_ascii_len=${#tls_hello_ascii}
for (( i=0; i<tls_hello_ascii_len; i=i+msg_len )); do
remaining=$tls_hello_ascii_len-$i
[[ $remaining -lt 10 ]] && return 1
tls_content_type="${tls_hello_ascii:i:2}"
[[ "$tls_content_type" != "15" ]] && [[ "$tls_content_type" != "16" ]] && \
[[ "$tls_content_type" != "17" ]] && return 2
i=$i+2
tls_protocol="${tls_hello_ascii:i:4}"
[[ -z "$DETECTED_TLS_VERSION" ]] && DETECTED_TLS_VERSION=$tls_protocol
[[ "${tls_protocol:0:2}" != "03" ]] && return 2
i=$i+4
msg_len=2*$(hex2dec "${tls_hello_ascii:i:4}")
i=$i+4
remaining=$tls_hello_ascii_len-$i
[[ $msg_len -gt $remaining ]] && return 1
if [[ "$tls_content_type" == "16" ]]; then
tls_handshake_ascii+="${tls_hello_ascii:i:msg_len}"
tls_handshake_ascii_len=${#tls_handshake_ascii}
# the ServerHello MUST be the first handshake message
[[ $tls_handshake_ascii_len -ge 2 ]] && [[ "${tls_handshake_ascii:0:2}" != "02" ]] && return 2
if [[ $tls_handshake_ascii_len -ge 12 ]]; then
DETECTED_TLS_VERSION="${tls_handshake_ascii:8:4}"
if [[ 0x"$DETECTED_TLS_VERSION" -ge "0x0304" ]]; then
tls_handshake_ascii_len=2*$(hex2dec "${tls_handshake_ascii:2:6}")
if [[ $tls_handshake_ascii_len+8 -gt $remaining ]]; then
return 1 # Not all of the ServerHello message has been received
else
return 3
fi
fi
fi
elif [[ "$tls_content_type" == "15" ]]; then # TLS ALERT
tls_alert_ascii+="${tls_hello_ascii:i:msg_len}"
fi
done
# If there is a fatal alert, then we are done.
tls_alert_ascii_len=${#tls_alert_ascii}
for (( i=0; i<tls_alert_ascii_len; i=i+4 )); do
remaining=$tls_alert_ascii_len-$i
[[ $remaining -lt 4 ]] && return 1
tls_err_level=${tls_alert_ascii:i:2} # 1: warning, 2: fatal
[[ $tls_err_level == "02" ]] && DETECTED_TLS_VERSION="" && return 0
done
# If there is a serverHelloDone or Finished, then we are done.
tls_handshake_ascii_len=${#tls_handshake_ascii}
for (( i=0; i<tls_handshake_ascii_len; i=i+msg_len )); do
remaining=$tls_handshake_ascii_len-$i
[[ $remaining -lt 8 ]] && return 1
tls_msg_type="${tls_handshake_ascii:i:2}"
i=$i+2
msg_len=2*$(hex2dec "${tls_handshake_ascii:i:6}")
i=$i+6
remaining=$tls_handshake_ascii_len-$i
[[ $msg_len -gt $remaining ]] && return 1
# For SSLv3 - TLS1.2 look for a ServerHelloDone message.
# For TLS 1.3 look for a Finished message.
[[ $tls_msg_type == "0E" ]] && return 0
[[ $tls_msg_type == "14" ]] && return 0
done
# If we haven't encoountered a fatal alert or a server hello done,
# then there must be more data to retrieve.
return 1
}
# arg1: ASCII-HEX encoded reply
parse_tls_serverhello() {
local tls_hello_ascii=$(hexdump -v -e '16/1 "%02X"' "$1")
local tls_hello_ascii="$1"
local tls_handshake_ascii="" tls_alert_ascii=""
local -i tls_hello_ascii_len tls_handshake_ascii_len tls_alert_ascii_len msg_len
local tls_serverhello_ascii=""
@@ -6322,12 +6410,18 @@ socksend_tls_clienthello() {
# arg1: TLS version low byte
# (00: SSLv3, 01: TLS 1.0, 02: TLS 1.1, 03: TLS 1.2)
# arg2: (optional) list of cipher suites
# arg3: (optional): "all" - process full response (including Certificate and certificate_status handshake messages)
# "ephemeralkey" - extract the server's ephemeral key (if any)
tls_sockets() {
local -i ret=0
local -i save=0
local lines
local tls_low_byte
local cipher_list_2send
local sock_reply_file2 sock_reply_file3
local tls_hello_ascii next_packet hello_done=0
local process_full="$3"
tls_low_byte="$1"
if [[ -n "$2" ]]; then # use supplied string in arg2 if there is one
@@ -6348,15 +6442,68 @@ tls_sockets() {
if [[ $ret -eq 0 ]]; then
sockread_serverhello 32768
TLS_NOW=$(LC_ALL=C date "+%s")
tls_hello_ascii=$(hexdump -v -e '16/1 "%02X"' "$SOCK_REPLY_FILE")
tls_hello_ascii="${tls_hello_ascii%%[!0-9A-F]*}"
# The server's response may span more than one packet. So,
# check if response appears to be complete, and if it isn't
# then try to get another packet from the server.
if [[ "$process_full" == "all" ]] || [[ "$process_full" == "ephemeralkey" ]]; then
check_tls_serverhellodone "$tls_hello_ascii"
hello_done=$?
[[ "$hello_done" -eq 3 ]] && process_full="ephemeralkey"
fi
for (( 1 ; hello_done==1; 1 )); do
sock_reply_file2=$(mktemp $TEMPDIR/ddreply.XXXXXX) || return 7
mv "$SOCK_REPLY_FILE" "$sock_reply_file2"
debugme echo "requesting more server hello data..."
socksend "" $USLEEP_SND
sockread_serverhello 32768
next_packet=$(hexdump -v -e '16/1 "%02X"' "$SOCK_REPLY_FILE")
next_packet="${next_packet%%[!0-9A-F]*}"
if [[ ${#next_packet} -eq 0 ]]; then
# This shouldn't be necessary. However, it protects against
# getting into an infinite loop if the server has nothing
# left to send and check_tls_serverhellodone doesn't
# correctly catch it.
mv "$sock_reply_file2" "$SOCK_REPLY_FILE"
hello_done=0
else
tls_hello_ascii+="$next_packet"
sock_reply_file3=$(mktemp $TEMPDIR/ddreply.XXXXXX) || return 7
mv "$SOCK_REPLY_FILE" "$sock_reply_file3"
mv "$sock_reply_file2" "$SOCK_REPLY_FILE"
cat "$sock_reply_file3" >> "$SOCK_REPLY_FILE"
rm "$sock_reply_file3"
check_tls_serverhellodone "$tls_hello_ascii"
hello_done=$?
[[ "$hello_done" -eq 3 ]] && process_full="ephemeralkey"
fi
done
debugme outln "reading server hello..."
if [[ "$DEBUG" -ge 4 ]]; then
hexdump -C $SOCK_REPLY_FILE | head -6
echo
fi
parse_tls_serverhello "$SOCK_REPLY_FILE"
parse_tls_serverhello "$tls_hello_ascii" "$process_full"
save=$?
if [[ $save == 0 ]]; then
debugme echo "sending close_notify..."
if [[ "$DETECTED_TLS_VERSION" == "0300" ]]; then
socksend ",x15, x03, x00, x00, x02, x02, x00" 0
else
socksend ",x15, x03, x01, x00, x02, x02, x00" 0
fi
fi
# see https://secure.wand.net.nz/trac/libprotoident/wiki/SSL
lines=$(count_lines "$(hexdump -C "$SOCK_REPLY_FILE" 2>$ERRFILE)")
debugme out " (returned $lines lines) "
@@ -9465,7 +9612,7 @@ lets_roll() {
determine_service "$1" # any starttls service goes here
$do_tls_sockets && [[ $TLS_LOW_BYTE -eq 22 ]] && { sslv2_sockets "" "true"; echo "$?" ; exit 0; }
$do_tls_sockets && [[ $TLS_LOW_BYTE -ne 22 ]] && { tls_sockets "$TLS_LOW_BYTE" "$HEX_CIPHER"; echo "$?" ; exit 0; }
$do_tls_sockets && [[ $TLS_LOW_BYTE -ne 22 ]] && { tls_sockets "$TLS_LOW_BYTE" "$HEX_CIPHER" "all"; echo "$?" ; exit 0; }
$do_test_just_one && test_just_one ${single_cipher}
# all top level functions now following have the prefix "run_"