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Allow cipher list to be passed to sslv2_sockets()

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This PR changes `sslv2_sockets()` so that a list of ciphers may optionally be passed as an argument. This will support the use of `sslv2_sockets()` in some places where `$OPENSSL s_client` is currently used.
This commit is contained in:
David Cooper 2016-09-28 13:46:43 -04:00 committed by GitHub
parent a54df8a55b
commit 4751a58d56
1 changed files with 38 additions and 21 deletions
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59
testssl.sh
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@ -299,26 +299,6 @@ c0,0d, c0,03, 00,0a, 00,63, 00,15, 00,12, 00,0f, 00,0c,
00,62, 00,09, 00,65, 00,64, 00,14, 00,11, 00,0e, 00,0b,
00,08, 00,06, 00,03, 00,ff"
readonly SSLv2_CLIENT_HELLO="
,80,34 # length (here: 52)
,01 # Client Hello
,00,02 # SSLv2
,00,1b # cipher spec length (here: 27 )
,00,00 # session ID length
,00,10 # challenge length
,05,00,80 # 1st cipher 9 cipher specs, only classical V2 ciphers are used here, see FIXME below
,03,00,80 # 2nd there are v3 in v2!!! : https://tools.ietf.org/html/rfc6101#appendix-E
,01,00,80 # 3rd Cipher specifications introduced in version 3.0 can be included in version 2.0 client hello messages using
,07,00,c0 # 4th the syntax below. [..] # V2CipherSpec (see Version 3.0 name) = { 0x00, CipherSuite }; !!!!
,08,00,80 # 5th
,06,00,40 # 6th
,04,00,80 # 7th
,02,00,80 # 8th
,00,00,00 # 9th
,29,22,be,b3,5a,01,8b,04,fe,5f,80,03,a0,13,eb,c4" # Challenge
# https://idea.popcount.org/2012-06-16-dissecting-ssl-handshake/ (client)
# FIXME: http://max.euston.net/d/tip_sslciphers.html
###### Cipher suite information #####
CIPHERS_BY_STRENGTH_FILE=""
declare -i TLS_NR_CIPHERS=0
@ -5759,12 +5739,49 @@ parse_tls_serverhello() {
}
#arg1: list of ciphers suites or empty
sslv2_sockets() {
local ret
local client_hello cipher_suites len_client_hello
local len_ciph_suites_byte len_ciph_suites
if [[ -n "$1" ]]; then
cipher_suites="$1"
else
cipher_suites="
05,00,80, # 1st cipher 9 cipher specs, only classical V2 ciphers are used here, see FIXME below
03,00,80, # 2nd there are v3 in v2!!! : https://tools.ietf.org/html/rfc6101#appendix-E
01,00,80, # 3rd Cipher specifications introduced in version 3.0 can be included in version 2.0 client hello messages using
07,00,c0, # 4th the syntax below. [..] # V2CipherSpec (see Version 3.0 name) = { 0x00, CipherSuite }; !!!!
08,00,80, # 5th
06,00,40, # 6th
04,00,80, # 7th
02,00,80, # 8th
00,00,00" # 9th
# FIXME: http://max.euston.net/d/tip_sslciphers.html
fi
code2network "$cipher_suites" # convert CIPHER_SUITES
cipher_suites="$NW_STR" # we don't have the leading \x here so string length is two byte less, see next
len_ciph_suites_byte=$(echo ${#cipher_suites})
let "len_ciph_suites_byte += 2"
len_ciph_suites=$(printf "%02x\n" $(($len_ciph_suites_byte / 4 )))
len_client_hello=$(printf "%02x\n" $((0x$len_ciph_suites + 0x19)))
client_hello="
,80,$len_client_hello # length
,01 # Client Hello
,00,02 # SSLv2
,00,$len_ciph_suites # cipher spec length
,00,00 # session ID length
,00,10 # challenge length
,$cipher_suites
,29,22,be,b3,5a,01,8b,04,fe,5f,80,03,a0,13,eb,c4" # Challenge
# https://idea.popcount.org/2012-06-16-dissecting-ssl-handshake/ (client)
fd_socket 5 || return 6
debugme outln "sending client hello... "
socksend_sslv2_clienthello "$SSLv2_CLIENT_HELLO"
socksend_sslv2_clienthello "$client_hello"
sockread_serverhello 32768
debugme outln "reading server hello... "