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Deprecated elliptic curves

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Most of the curves that were defined for the supported_groups extension in RFC 4492 have been deprecated in RFC 8422 and RFC 8446. Appendix B.3.1.4 of RFC 8446 says that these deprecated values "are used in previous versions of TLS and MUST NOT be offered or negotiated by TLS 1.3 implementations."

According to a recent discussion on the TLS mail list (see, for example, https://www.ietf.org/mail-archive/web/tls/current/msg26974.html and https://www.ietf.org/mail-archive/web/tls/current/msg26980.html) a TLS 1.3 server implementation may choose to reject a TLS 1.3 ClientHello simply because the ClientHello offers one or more of the deprecated curves.

This PR address this issue by no longer offering the deprecated curves in TLS 1.3 ClientHello messages. This only affects run_pfs(), since socksend_tls_clienthello() already does not offer the deprecated curves in TLS 1.3 ClientHello messages.

The change in this PR has no affect on the testing of servers that do not support TLS 1.3. For those that do support TLS 1.3, only the 5 non-deprecated curves are tested with TLS 1.3, but all 30 curves are tested with TLS 1.2.
This commit is contained in:
David Cooper 2018-09-17 11:57:51 -04:00
parent 96a1002f84
commit 4effe1dbf3
1 changed files with 9 additions and 2 deletions
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testssl.sh
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@ -8267,6 +8267,9 @@ run_pfs() {
local curves_hex=("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" "00,1d" "00,1e")
local -a curves_ossl=("sect163k1" "sect163r1" "sect163r2" "sect193r1" "sect193r2" "sect233k1" "sect233r1" "sect239k1" "sect283k1" "sect283r1" "sect409k1" "sect409r1" "sect571k1" "sect571r1" "secp160k1" "secp160r1" "secp160r2" "secp192k1" "prime192v1" "secp224k1" "secp224r1" "secp256k1" "prime256v1" "secp384r1" "secp521r1" "brainpoolP256r1" "brainpoolP384r1" "brainpoolP512r1" "X25519" "X448")
local -a curves_ossl_output=("K-163" "sect163r1" "B-163" "sect193r1" "sect193r2" "K-233" "B-233" "sect239k1" "K-283" "B-283" "K-409" "B-409" "K-571" "B-571" "secp160k1" "secp160r1" "secp160r2" "secp192k1" "P-192" "secp224k1" "P-224" "secp256k1" "P-256" "P-384" "P-521" "brainpoolP256r1" "brainpoolP384r1" "brainpoolP512r1" "X25519" "X448")
# Many curves have been deprecated, and RFC 8446, Appendix B.3.1.4, states
# that these curves MUST NOT be offered in a TLS 1.3 ClientHello.
local -a curves_deprecated=("true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "true" "false" "false" "false" "true" "true" "true" "false" "false")
local -a ffdhe_groups_hex=("01,00" "01,01" "01,02" "01,03" "01,04")
local -a ffdhe_groups_output=("ffdhe2048" "ffdhe3072" "ffdhe4096" "ffdhe6144" "ffdhe8192")
local -a supported_curve
@ -8540,7 +8543,9 @@ run_pfs() {
while true; do
curves_to_test=""
for (( i=low; i < high; i++ )); do
"${ossl_supported[i]}" && ! "${supported_curve[i]}" && curves_to_test+=":${curves_ossl[i]}"
if ! "$HAS_TLS13" || ! "${curves_deprecated[i]}" || [[ "$proto" == "-no_tls1_3" ]]; then
"${ossl_supported[i]}" && ! "${supported_curve[i]}" && curves_to_test+=":${curves_ossl[i]}"
fi
done
[[ -z "$curves_to_test" ]] && break
$OPENSSL s_client $(s_client_options "$proto -cipher "\'${ecdhe_cipher_list:1}\'" -ciphersuites "\'${tls13_cipher_list:1}\'" -curves "${curves_to_test:1}" $STARTTLS $BUGS -connect $NODEIP:$PORT $PROXY $SNI") &>$TMPFILE </dev/null
@ -8571,7 +8576,9 @@ run_pfs() {
while true; do
curves_to_test=""
for (( i=0; i < nr_curves; i++ )); do
! "${supported_curve[i]}" && curves_to_test+=", ${curves_hex[i]}"
if ! "${curves_deprecated[i]}" || [[ "$proto" == "03" ]]; then
! "${supported_curve[i]}" && curves_to_test+=", ${curves_hex[i]}"
fi
done
[[ -z "$curves_to_test" ]] && break
len1=$(printf "%02x" "$((2*${#curves_to_test}/7))")