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testssl.sh
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Find more extensions in run_server_defaults() 

This PR uses `tls_sockets()` to determine whether a server supports certain extensions that may not be supported by `$OPENSSL`. At the moment it checks for max_fragment_length, client_certificate_url, truncated_hmac, ALPN, signed_certificate_timestamp, encrypt_then_mac, and extended_master_secret.

In https://github.com/dcooper16/testssl.sh/blob/extended_tls_sockets/testssl.sh, `run_server_defaults()` is re-written to use `tls_sockets()` instead of `$OPENSSL`, with just one call to `$OPENSSL s_client` to get the session ticket, which reduces the dependence on `$OPENSSL`, but this PR limits the number of calls to `tls_sockets()`, which is still slow.

Note: I included ALPN in the `tls_sockets()` ClientHello since a single call to `tls_sockets()` cannot test for both NPN and ALPN, and since support for NPN was added to OpenSSL before support for ALPN was added, I figured it was more likely that `determine_tls_extensions()` had already determined whether the server supported NPN.
This commit is contained in:
David Cooper 2016-11-08 12:36:25 -05:00 committed by GitHub
parent 9ea5cf8698
commit 3a68e5b937
1 changed files with 38 additions and 0 deletions
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testssl.sh
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@ -839,6 +839,23 @@ asciihex_to_binary_file(){
return 0
}
# arg1: text string
# Output a comma-separated ASCII-HEX string resprestation of the input string.
string_to_asciihex() {
local string="$1"
local -i i eos
local output=""
eos=${#string}-1
for (( i=0; i<eos; i++ )); do
output+="$(printf "%02x," "'${string:i:1}")"
done
[[ -n "$string" ]] && output+="$(printf "%02x" "'${string:eos:1}")"
out "$output"
return 0
}
###### check code starts here ######
# determines whether the port has an HTTP service running or not (plain TLS, no STARTTLS)
@ -5135,6 +5152,8 @@ run_server_defaults() {
local -a ocsp_response ocsp_response_status sni_used
local -a ciphers_to_test success
local cn_nosni cn_sni sans_nosni sans_sni san
local alpn_proto alpn="" alpn_list_len_hex alpn_extn_len_hex success
local -i alpn_list_len alpn_extn_len
# Try each public key type once:
# ciphers_to_test[1]: cipher suites using certificates with RSA signature public keys
@ -5269,6 +5288,25 @@ run_server_defaults() {
sessticket_str=$(grep -aw "session ticket" $TMPFILE | grep -a lifetime)
fi
# Use TLS sockets to check whether server supports certain extensions that aren't supported by $OPENSSL
for alpn_proto in $ALPN_PROTOs; do
alpn+=",$(printf "%02x" ${#alpn_proto}),$(string_to_asciihex "$alpn_proto")"
done
alpn_list_len=${#alpn}/3
alpn_list_len_hex=$(printf "%04x" $alpn_list_len)
alpn_extn_len=$alpn_list_len+2
alpn_extn_len_hex=$(printf "%04x" $alpn_extn_len)
tls_sockets "03" "$TLS12_CIPHER" "all" "00,01,00,01,02, 00,02,00,00, 00,04,00,00, 00,12,00,00, 00,16,00,00, 00,17,00,00, 00,10,${alpn_extn_len_hex:0:2},${alpn_extn_len_hex:2:2},${alpn_list_len_hex:0:2},${alpn_list_len_hex:2:2}$alpn"
success=$?
if [[ $success -eq 0 ]] || [[ $success -eq 2 ]]; then
# check to see if any new TLS extensions were returned and add any new ones to all_tls_extensions
while read -d "\"" -r line; do
if [[ $line != "" ]] && ! grep -q "$line" <<< "$all_tls_extensions"; then
all_tls_extensions="${all_tls_extensions} \"${line}\""
fi
done <<<$TLS_EXTENSIONS
fi
outln
pr_headlineln " Testing server defaults (Server Hello) "
outln