More extensions in socksend_tls_clienthello()
This PR adds the signature algorithms, heartbeat, session ticket, and next protocol extensions to the client hello message created by socksend_tls_clienthello() for TLS 1.0 and above. It also adds the supported elliptic curves and ec points format extensions if the client hello message includes any ECC cipher suites. I tested this version against several servers with $EXPERIMENTAL set to true and get the same results as with the current code with $EXPERIMENTAL set to false.
This commit is contained in:
David Cooper
parent
199708f94c
commit
7e506e5c5a
172
testssl.sh
172
testssl.sh
|
|
@ -4165,41 +4165,128 @@ sslv2_sockets() {
|
|||
# ARG1: TLS version low byte (00: SSLv3, 01: TLS 1.0, 02: TLS 1.1, 03: TLS 1.2)
|
||||
# ARG2: CIPHER_SUITES string
|
||||
socksend_tls_clienthello() {
|
||||
#FIXME: redo this with all extensions!
|
||||
local tls_low_byte="$1"
|
||||
local tls_word_reclayer="03, 01" # the first TLS version number is the record layer and always 0301 -- except: SSLv3
|
||||
local servername_hexstr len_servername len_servername_hex
|
||||
local hexdump_format_str
|
||||
local all_extensions
|
||||
local hexdump_format_str part1 part2
|
||||
local all_extensions=""
|
||||
local -i i j len_extension
|
||||
local len_sni_listlen len_sni_ext len_extension_hex
|
||||
local cipher_suites len_ciph_suites len_ciph_suites_word
|
||||
local cipher_suites len_ciph_suites len_ciph_suites_byte len_ciph_suites_word
|
||||
local len_client_hello_word len_all_word
|
||||
|
||||
#len_servername=$(echo ${#NODE})
|
||||
len_servername=${#NODE}
|
||||
hexdump_format_str="$len_servername/1 \"%02x,\""
|
||||
servername_hexstr=$(printf $NODE | hexdump -v -e "${hexdump_format_str}" | sed 's/,$//')
|
||||
local ecc_cipher_suite_found=false
|
||||
local extension_signature_algorithms extension_heartbeat
|
||||
local extension_session_ticket extension_next_protocol extensions_ecc
|
||||
|
||||
code2network "$2" # convert CIPHER_SUITES
|
||||
cipher_suites="$NW_STR" # we don't have the leading \x here so string length is two byte less, see next
|
||||
|
||||
#formatted example for SNI
|
||||
#00 00 # extension server_name
|
||||
#00 1a # length = the following +2 = server_name length + 5
|
||||
#00 18 # server_name list_length = server_name length +3
|
||||
#00 # server_name type (hostname)
|
||||
#00 15 # server_name length
|
||||
#66 66 66 66 66 66 2e 66 66 66 66 66 66 66 66 66 66 2e 66 66 66 target.mydomain1.tld # server_name target
|
||||
|
||||
# convert lengths we need to fill in from dec to hex:
|
||||
len_servername_hex=$(printf "%02x\n" $len_servername)
|
||||
len_sni_listlen=$(printf "%02x\n" $((len_servername+3)))
|
||||
len_sni_ext=$(printf "%02x\n" $((len_servername+5)))
|
||||
len_extension_hex=$(printf "%02x\n" $((len_servername+9))) #FIXME: for TLS 1.2 and IIS servers we need extension_signature_algorithms!!
|
||||
|
||||
len_ciph_suites_byte=$(echo ${#cipher_suites})
|
||||
let "len_ciph_suites_byte += 2"
|
||||
|
||||
if [[ "$tls_low_byte" != "00" ]]; then
|
||||
# Add extensions
|
||||
|
||||
# Check to see if any ECC cipher suites are included in cipher_suites
|
||||
for (( i=0; i<len_ciph_suites_byte; i=i+8 )); do
|
||||
j=$i+4
|
||||
part1="0x${cipher_suites:$i:2}"
|
||||
part2="0x${cipher_suites:$j:2}"
|
||||
if [[ "$part1" == "0xc0" ]]; then
|
||||
if [[ "$part2" -ge "0x01" ]] && [[ "$part2" -le "0x19" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x23" ]] && [[ "$part2" -le "0x3b" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x48" ]] && [[ "$part2" -le "0x4f" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x5c" ]] && [[ "$part2" -le "0x63" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x70" ]] && [[ "$part2" -le "0x79" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x86" ]] && [[ "$part2" -le "0x8d" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0x9a" ]] && [[ "$part2" -le "0x9b" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
elif [[ "$part2" -ge "0xac" ]] && [[ "$part2" -le "0xaf" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
fi
|
||||
elif [[ "$part1" == "0xcc" ]]; then
|
||||
if [[ "$part2" == "0xa8" ]] || [[ "$part2" == "0xa9" ]] || [[ "$part2" == "0xac" ]] || [[ "$part2" == "13" ]] || [[ "$part2" == "0x14" ]]; then
|
||||
ecc_cipher_suite_found=true && break
|
||||
fi
|
||||
fi
|
||||
done
|
||||
|
||||
#formatted example for SNI
|
||||
#00 00 # extension server_name
|
||||
#00 1a # length = the following +2 = server_name length + 5
|
||||
#00 18 # server_name list_length = server_name length +3
|
||||
#00 # server_name type (hostname)
|
||||
#00 15 # server_name length
|
||||
#66 66 66 66 66 66 2e 66 66 66 66 66 66 66 66 66 66 2e 66 66 66 target.mydomain1.tld # server_name target
|
||||
len_servername=${#NODE}
|
||||
hexdump_format_str="$len_servername/1 \"%02x,\""
|
||||
servername_hexstr=$(printf $NODE | hexdump -v -e "${hexdump_format_str}" | sed 's/,$//')
|
||||
# convert lengths we need to fill in from dec to hex:
|
||||
len_servername_hex=$(printf "%02x\n" $len_servername)
|
||||
len_sni_listlen=$(printf "%02x\n" $((len_servername+3)))
|
||||
len_sni_ext=$(printf "%02x\n" $((len_servername+5)))
|
||||
|
||||
extension_signature_algorithms="
|
||||
00, 0d, # Type: signature_algorithms , see RFC 5246
|
||||
00, 20, # len
|
||||
00,1e, 06,01, 06,02, 06,03, 05,01, 05,02, 05,03,
|
||||
04,01, 04,02, 04,03, 03,01, 03,02, 03,03, 02,01, 02,02, 02,03"
|
||||
|
||||
extension_heartbeat="
|
||||
00, 0f, 00, 01, 01"
|
||||
|
||||
extension_session_ticket="
|
||||
00, 23, 00, 00"
|
||||
|
||||
extension_next_protocol="
|
||||
33, 74, 00, 00"
|
||||
|
||||
# Supported Elliptic Curves Extension and Supported Point Formats Extension.
|
||||
extensions_ecc="
|
||||
00, 0a, # Type: Supported Elliptic Curves , see RFC 4492
|
||||
00, 3a, 00, 38, # lengths
|
||||
00, 01, 00, 02, 00, 03, 00, 04, 00, 05, 00, 06, 00, 07, 00, 08,
|
||||
00, 09, 00, 0a, 00, 0b, 00, 0c, 00, 0d, 00, 0e, 00, 0f, 00, 10,
|
||||
00, 11, 00, 12, 00, 13, 00, 14, 00, 15, 00, 16, 00, 17, 00, 18,
|
||||
00, 19, 00, 1a, 00, 1b, 00, 1c,
|
||||
00, 0b, # Type: Supported Point Formats , see RFC 4492
|
||||
00, 02, # len
|
||||
01, 00"
|
||||
|
||||
all_extensions="
|
||||
00, 00 # extension server_name
|
||||
,00, $len_sni_ext # length SNI EXT
|
||||
,00, $len_sni_listlen # server_name list_length
|
||||
,00 # server_name type (hostname)
|
||||
,00, $len_servername_hex # server_name length. We assume len(hostname) < FF - 9
|
||||
,$servername_hexstr # server_name target
|
||||
,$extension_signature_algorithms
|
||||
,$extension_heartbeat
|
||||
,$extension_session_ticket
|
||||
,$extension_next_protocol"
|
||||
|
||||
if $ecc_cipher_suite_found; then
|
||||
all_extensions="$all_extensions
|
||||
,$extensions_ecc"
|
||||
fi
|
||||
|
||||
code2network "$all_extensions" # convert extensions
|
||||
all_extensions="$NW_STR" # we don't have the leading \x here so string length is two byte less, see next
|
||||
len_extension=${#all_extensions}
|
||||
len_extension+=2
|
||||
len_extension=$len_extension/4
|
||||
len_extension_hex=$(printf "%02x\n" $len_extension)
|
||||
all_extensions="
|
||||
,00, $len_extension_hex # first the len of all extentions.
|
||||
,$all_extensions"
|
||||
fi
|
||||
|
||||
# we have additional 2 chars \x in each 2 byte string and 2 byte ciphers, so we need to divide by 4:
|
||||
len_ciph_suites=$(printf "%02x\n" $(($len_ciph_suites_byte / 4 )))
|
||||
len2twobytes "$len_ciph_suites"
|
||||
|
|
@ -4245,45 +4332,6 @@ socksend_tls_clienthello() {
|
|||
,01 # Compression methods length
|
||||
,00" # Compression method (x00 for NULL)
|
||||
|
||||
#TODO,add (see heartbleed)
|
||||
# extension lenghth (word)
|
||||
# extension ec_point_formats (4 words) 1st: 00 0b
|
||||
#len 00 04
|
||||
# ec prot formats len: 03
|
||||
# uncompressed 00
|
||||
# EC point format: ansiX962_compressed_prime 01
|
||||
# EC point format: ansiX962_compressed_char2 02
|
||||
|
||||
# ec, 1st: 00 0a
|
||||
# 2nd length: (word) e.g. 0x34
|
||||
# 3rd: ec curve len ln-2 e.g. 0x32
|
||||
# 4.-n. curves e.g. 25 words
|
||||
|
||||
# Extension: Session Ticket 00 23
|
||||
|
||||
extension_signature_algorithms="
|
||||
00, 0d, # Type: signature_algorithms , see RFC 5246
|
||||
00, 20, # len
|
||||
00,1e, 06,01, 06,02, 06,03, 05,01, 05,02, 05,03,
|
||||
04,01, 04,02, 04,03, 03,01, 03,02, 03,03, 02,01, 02,02, 02,03"
|
||||
|
||||
# Extension: Haertbeat 00 0f
|
||||
# len 00 01
|
||||
# peer allowed to send requests 01
|
||||
|
||||
if [[ "$tls_low_byte" == "00" ]]; then
|
||||
all_extensions=""
|
||||
else #FIXME: we (probably) need extension_signature_algorithms here. TLS 1.2 fails on IIS otherwise
|
||||
all_extensions="
|
||||
,00, $len_extension_hex # first the len of all (here: 1) extentions. We assume len(hostname) < FF - 9
|
||||
,00, 00 # extension server_name
|
||||
,00, $len_sni_ext # length SNI EXT
|
||||
,00, $len_sni_listlen # server_name list_length
|
||||
,00 # server_name type (hostname)
|
||||
,00, $len_servername_hex # server_name length
|
||||
,$servername_hexstr" # server_name target
|
||||
fi
|
||||
|
||||
fd_socket 5 || return 6
|
||||
|
||||
code2network "$TLS_CLIENT_HELLO$all_extensions"
|
||||
|
|
|
|||
Loading…
Reference in New Issue