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
152
testssl.sh
152
testssl.sh
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@ -4165,24 +4165,58 @@ sslv2_sockets() {
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# ARG1: TLS version low byte (00: SSLv3, 01: TLS 1.0, 02: TLS 1.1, 03: TLS 1.2)
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# ARG2: CIPHER_SUITES string
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socksend_tls_clienthello() {
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#FIXME: redo this with all extensions!
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local tls_low_byte="$1"
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local tls_word_reclayer="03, 01" # the first TLS version number is the record layer and always 0301 -- except: SSLv3
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local servername_hexstr len_servername len_servername_hex
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local hexdump_format_str
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local all_extensions
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local hexdump_format_str part1 part2
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local all_extensions=""
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local -i i j len_extension
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local len_sni_listlen len_sni_ext len_extension_hex
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local cipher_suites len_ciph_suites len_ciph_suites_word
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local cipher_suites len_ciph_suites len_ciph_suites_byte len_ciph_suites_word
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local len_client_hello_word len_all_word
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#len_servername=$(echo ${#NODE})
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len_servername=${#NODE}
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hexdump_format_str="$len_servername/1 \"%02x,\""
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servername_hexstr=$(printf $NODE | hexdump -v -e "${hexdump_format_str}" | sed 's/,$//')
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local ecc_cipher_suite_found=false
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local extension_signature_algorithms extension_heartbeat
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local extension_session_ticket extension_next_protocol extensions_ecc
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code2network "$2" # convert CIPHER_SUITES
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cipher_suites="$NW_STR" # we don't have the leading \x here so string length is two byte less, see next
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len_ciph_suites_byte=$(echo ${#cipher_suites})
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let "len_ciph_suites_byte += 2"
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if [[ "$tls_low_byte" != "00" ]]; then
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# Add extensions
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# Check to see if any ECC cipher suites are included in cipher_suites
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for (( i=0; i<len_ciph_suites_byte; i=i+8 )); do
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j=$i+4
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part1="0x${cipher_suites:$i:2}"
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part2="0x${cipher_suites:$j:2}"
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if [[ "$part1" == "0xc0" ]]; then
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if [[ "$part2" -ge "0x01" ]] && [[ "$part2" -le "0x19" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x23" ]] && [[ "$part2" -le "0x3b" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x48" ]] && [[ "$part2" -le "0x4f" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x5c" ]] && [[ "$part2" -le "0x63" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x70" ]] && [[ "$part2" -le "0x79" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x86" ]] && [[ "$part2" -le "0x8d" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0x9a" ]] && [[ "$part2" -le "0x9b" ]]; then
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ecc_cipher_suite_found=true && break
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elif [[ "$part2" -ge "0xac" ]] && [[ "$part2" -le "0xaf" ]]; then
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ecc_cipher_suite_found=true && break
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fi
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elif [[ "$part1" == "0xcc" ]]; then
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if [[ "$part2" == "0xa8" ]] || [[ "$part2" == "0xa9" ]] || [[ "$part2" == "0xac" ]] || [[ "$part2" == "13" ]] || [[ "$part2" == "0x14" ]]; then
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ecc_cipher_suite_found=true && break
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fi
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fi
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done
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#formatted example for SNI
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#00 00 # extension server_name
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#00 1a # length = the following +2 = server_name length + 5
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@ -4190,15 +4224,68 @@ socksend_tls_clienthello() {
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#00 # server_name type (hostname)
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#00 15 # server_name length
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#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
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len_servername=${#NODE}
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hexdump_format_str="$len_servername/1 \"%02x,\""
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servername_hexstr=$(printf $NODE | hexdump -v -e "${hexdump_format_str}" | sed 's/,$//')
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# convert lengths we need to fill in from dec to hex:
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len_servername_hex=$(printf "%02x\n" $len_servername)
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len_sni_listlen=$(printf "%02x\n" $((len_servername+3)))
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len_sni_ext=$(printf "%02x\n" $((len_servername+5)))
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len_extension_hex=$(printf "%02x\n" $((len_servername+9))) #FIXME: for TLS 1.2 and IIS servers we need extension_signature_algorithms!!
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len_ciph_suites_byte=$(echo ${#cipher_suites})
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let "len_ciph_suites_byte += 2"
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extension_signature_algorithms="
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00, 0d, # Type: signature_algorithms , see RFC 5246
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00, 20, # len
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00,1e, 06,01, 06,02, 06,03, 05,01, 05,02, 05,03,
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04,01, 04,02, 04,03, 03,01, 03,02, 03,03, 02,01, 02,02, 02,03"
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extension_heartbeat="
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00, 0f, 00, 01, 01"
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extension_session_ticket="
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00, 23, 00, 00"
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extension_next_protocol="
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33, 74, 00, 00"
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# Supported Elliptic Curves Extension and Supported Point Formats Extension.
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extensions_ecc="
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00, 0a, # Type: Supported Elliptic Curves , see RFC 4492
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00, 3a, 00, 38, # lengths
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00, 01, 00, 02, 00, 03, 00, 04, 00, 05, 00, 06, 00, 07, 00, 08,
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00, 09, 00, 0a, 00, 0b, 00, 0c, 00, 0d, 00, 0e, 00, 0f, 00, 10,
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00, 11, 00, 12, 00, 13, 00, 14, 00, 15, 00, 16, 00, 17, 00, 18,
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00, 19, 00, 1a, 00, 1b, 00, 1c,
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00, 0b, # Type: Supported Point Formats , see RFC 4492
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00, 02, # len
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01, 00"
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all_extensions="
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00, 00 # extension server_name
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,00, $len_sni_ext # length SNI EXT
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,00, $len_sni_listlen # server_name list_length
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,00 # server_name type (hostname)
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,00, $len_servername_hex # server_name length. We assume len(hostname) < FF - 9
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,$servername_hexstr # server_name target
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,$extension_signature_algorithms
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,$extension_heartbeat
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,$extension_session_ticket
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,$extension_next_protocol"
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if $ecc_cipher_suite_found; then
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all_extensions="$all_extensions
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,$extensions_ecc"
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fi
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code2network "$all_extensions" # convert extensions
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all_extensions="$NW_STR" # we don't have the leading \x here so string length is two byte less, see next
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len_extension=${#all_extensions}
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len_extension+=2
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len_extension=$len_extension/4
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len_extension_hex=$(printf "%02x\n" $len_extension)
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all_extensions="
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,00, $len_extension_hex # first the len of all extentions.
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,$all_extensions"
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fi
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# we have additional 2 chars \x in each 2 byte string and 2 byte ciphers, so we need to divide by 4:
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len_ciph_suites=$(printf "%02x\n" $(($len_ciph_suites_byte / 4 )))
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@ -4245,45 +4332,6 @@ socksend_tls_clienthello() {
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,01 # Compression methods length
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,00" # Compression method (x00 for NULL)
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#TODO,add (see heartbleed)
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# extension lenghth (word)
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# extension ec_point_formats (4 words) 1st: 00 0b
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#len 00 04
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# ec prot formats len: 03
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# uncompressed 00
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# EC point format: ansiX962_compressed_prime 01
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# EC point format: ansiX962_compressed_char2 02
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# ec, 1st: 00 0a
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# 2nd length: (word) e.g. 0x34
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# 3rd: ec curve len ln-2 e.g. 0x32
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# 4.-n. curves e.g. 25 words
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# Extension: Session Ticket 00 23
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extension_signature_algorithms="
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00, 0d, # Type: signature_algorithms , see RFC 5246
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00, 20, # len
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00,1e, 06,01, 06,02, 06,03, 05,01, 05,02, 05,03,
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04,01, 04,02, 04,03, 03,01, 03,02, 03,03, 02,01, 02,02, 02,03"
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# Extension: Haertbeat 00 0f
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# len 00 01
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# peer allowed to send requests 01
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if [[ "$tls_low_byte" == "00" ]]; then
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all_extensions=""
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else #FIXME: we (probably) need extension_signature_algorithms here. TLS 1.2 fails on IIS otherwise
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all_extensions="
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,00, $len_extension_hex # first the len of all (here: 1) extentions. We assume len(hostname) < FF - 9
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,00, 00 # extension server_name
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,00, $len_sni_ext # length SNI EXT
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,00, $len_sni_listlen # server_name list_length
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,00 # server_name type (hostname)
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,00, $len_servername_hex # server_name length
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,$servername_hexstr" # server_name target
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fi
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fd_socket 5 || return 6
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code2network "$TLS_CLIENT_HELLO$all_extensions"
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