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chore: Drop support for deprecated TLS versions (#2945)

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* chore: Set `TLS_INTERMEDIATE_SUITE` to only use TLS 1.2 ciphersuites

Removes support of the following cipher suites that are only valid for TLS 1.0 + 1.1:

- `ECDHE-ECDSA-AES128-SHA`
- `ECDHE-RSA-AES128-SHA`
- `ECDHE-ECDSA-AES256-SHA`
- `ECDHE-RSA-AES256-SHA`
- `DHE-RSA-AES128-SHA`
- `DHE-RSA-AES256-SHA`

* chore: Update TLS version min and ignore settings

These are now the same as modern settings.

* fix: Remove min TLS support workaround

No longer required now that outdated TLS versions have been dropped.

* tests: Remove support for TLS 1.0 and 1.1 ciphersuites

* tests: Remove support for TLS 1.0 and 1.1 ciphersuites (Port 25)

The removed SHA1 cipher suites are still supported in TLS 1.2, thus they've been excluded for port 25 via the `SHA1` exclusion pattern in `main.cf`.
This commit is contained in:
Brennan Kinney 2022-12-24 02:30:43 +13:00 committed by GitHub
parent b58165762a
commit 4dda5f8b1f
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 12 additions and 49 deletions
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2
target/postfix/main.cf
View file

@ -38,7 +38,7 @@ smtpd_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtp_tls_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtpd_tls_mandatory_ciphers = high
smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3,!TLSv1,!TLSv1.1
smtpd_tls_exclude_ciphers = aNULL, SEED, CAMELLIA, RSA+AES
smtpd_tls_exclude_ciphers = aNULL, SEED, CAMELLIA, RSA+AES, SHA1
smtpd_tls_dh1024_param_file = /etc/postfix/dhparams.pem
smtpd_tls_CApath = /etc/ssl/certs
smtp_tls_CApath = /etc/ssl/certs

18
target/scripts/helpers/ssl.sh
View file

@ -136,24 +136,12 @@ function _setup_ssl
;;
( "intermediate" )
local TLS_INTERMEDIATE_SUITE='ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA'
local TLS_INTERMEDIATE_IGNORE='!SSLv2,!SSLv3'
local TLS_INTERMEDIATE_MIN='TLSv1'
local TLS_INTERMEDIATE_SUITE='ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA256'
local TLS_INTERMEDIATE_IGNORE='!SSLv2,!SSLv3,!TLSv1,!TLSv1.1'
local TLS_INTERMEDIATE_MIN='TLSv1.2'
_apply_tls_level "${TLS_INTERMEDIATE_SUITE}" "${TLS_INTERMEDIATE_IGNORE}" "${TLS_INTERMEDIATE_MIN}"
# Lowers the minimum acceptable TLS version connection to `TLSv1` (from Debian upstream `TLSv1.2`)
# Lowers Security Level to `1` (from Debian upstream `2`, openssl release defaults to `1`)
# https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_security_level.html
# https://wiki.debian.org/ContinuousIntegration/TriagingTips/openssl-1.1.1
# https://dovecot.org/pipermail/dovecot/2020-October/120225.html
# TODO: This is a fix for Debian Bullseye Dovecot. Can remove when we only support TLS >=1.2.
# WARNING: This applies to all processes that use openssl and respect these settings.
sedfile -i -r \
-e 's|^(MinProtocol).*|\1 = TLSv1|' \
-e 's|^(CipherString).*|\1 = DEFAULT@SECLEVEL=1|' \
/usr/lib/ssl/openssl.cnf
_log 'debug' "TLS configured with 'intermediate' ciphers"
;;

41
test/tests/serial/security_tls_cipherlists.bats
View file

@ -165,18 +165,11 @@ function check_cipherlists() {
local RESULTS_FILE=$1
local p25=$2 # optional suffix
# TLS_LEVEL `modern` doesn't have TLS v1.0 or v1.1 cipher suites. Sets TLS v1.2 as minimum.
if [[ ${TLS_LEVEL} == "intermediate" ]]
then
compare_cipherlist "cipherorder_TLSv1" "${RESULTS_FILE}" "$(get_cipherlist "TLSv1${p25}")"
compare_cipherlist "cipherorder_TLSv1_1" "${RESULTS_FILE}" "$(get_cipherlist "TLSv1_1${p25}")"
fi
compare_cipherlist "cipherorder_TLSv1_2" "${RESULTS_FILE}" "$(get_cipherlist "TLSv1_2${p25}")"
compare_cipherlist "cipherorder_TLSv1_3" "${RESULTS_FILE}" "$(get_cipherlist 'TLSv1_3')"
}
# Expected cipher lists. Should match `TLS_LEVEL` cipher lists set in `start-mailserver.sh`.
# Expected cipher lists. Should match `TLS_LEVEL` cipher lists set in `scripts/helpers/ssl.sh`.
# Excluding Port 25 which uses defaults from Postfix after applying `smtpd_tls_exclude_ciphers` rules.
# NOTE: If a test fails, look at the `check_ports` params, then update the corresponding associative key's value
# with the `actual` error value (assuming an update needs to be made, and not a valid security issue to look into).
@ -192,48 +185,30 @@ function get_cipherlist() {
# Associative array for easy querying of required cipher list
declare -A CIPHER_LIST
# `intermediate` cipher lists TLS v1.0 and v1.1 cipher suites should be the same:
CIPHER_LIST["rsa_intermediate_TLSv1"]='"ECDHE-RSA-AES128-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES128-SHA DHE-RSA-AES256-SHA"'
CIPHER_LIST["rsa_intermediate_TLSv1_1"]=${CIPHER_LIST["rsa_intermediate_TLSv1"]}
CIPHER_LIST["rsa_intermediate_TLSv1_2"]='"ECDHE-RSA-CHACHA20-POLY1305 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 ECDHE-RSA-AES128-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA DHE-RSA-AES256-SHA256 DHE-RSA-AES256-SHA"'
# `modern` cipher lists shouldn't have TLS v1.0 or v1.1 cipher suites:
CIPHER_LIST["rsa_intermediate_TLSv1_2"]='"ECDHE-RSA-CHACHA20-POLY1305 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
CIPHER_LIST["rsa_modern_TLSv1_2"]='"ECDHE-RSA-AES128-GCM-SHA256 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
# ECDSA:
CIPHER_LIST["ecdsa_intermediate_TLSv1"]='"ECDHE-ECDSA-AES128-SHA ECDHE-ECDSA-AES256-SHA"'
CIPHER_LIST["ecdsa_intermediate_TLSv1_1"]=${CIPHER_LIST["ecdsa_intermediate_TLSv1"]}
CIPHER_LIST["ecdsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES128-SHA ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA"'
CIPHER_LIST["ecdsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES256-SHA384"'
CIPHER_LIST["ecdsa_modern_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305"'
# ECDSA + RSA fallback, dual cert support:
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1"]='"ECDHE-ECDSA-AES128-SHA ECDHE-RSA-AES128-SHA ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES128-SHA DHE-RSA-AES256-SHA"'
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_1"]=${CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1"]}
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 ECDHE-ECDSA-AES128-SHA ECDHE-RSA-AES256-SHA384 ECDHE-RSA-AES128-SHA ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA DHE-RSA-AES256-SHA256 DHE-RSA-AES256-SHA"'
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2"]='"ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 ECDHE-RSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA384 DHE-RSA-AES128-SHA256 DHE-RSA-AES256-SHA256"'
CIPHER_LIST["ecdsa_rsa_modern_TLSv1_2"]='"ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES256-GCM-SHA384"'
# Port 25
# TLSv1 and TLSv1_1 share the same cipher suites as other ports have. But the server order differs:
CIPHER_LIST["rsa_intermediate_TLSv1_p25"]='"ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA"'
CIPHER_LIST["rsa_intermediate_TLSv1_1_p25"]=${CIPHER_LIST["rsa_intermediate_TLSv1_p25"]}
# TLSv1_2 has different server order and also includes ARIA, CCM, DHE+CHACHA20-POLY1305 cipher suites:
CIPHER_LIST["rsa_intermediate_TLSv1_2_p25"]='"ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA ARIA256-GCM-SHA384 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA ARIA128-GCM-SHA256"'
# Port 25 is unaffected by `TLS_LEVEL` profiles (other than min TLS version), it has the same TLS v1.2 cipher list under both:
CIPHER_LIST["rsa_intermediate_TLSv1_2_p25"]='"ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
# Port 25 is unaffected by `TLS_LEVEL` profiles, it has the same TLS v1.2 cipher list under both:
CIPHER_LIST["rsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["rsa_intermediate_TLSv1_2_p25"]}
# ECDSA (Port 25):
CIPHER_LIST["ecdsa_intermediate_TLSv1_p25"]='"ECDHE-ECDSA-AES256-SHA ECDHE-ECDSA-AES128-SHA"'
CIPHER_LIST["ecdsa_intermediate_TLSv1_1_p25"]=${CIPHER_LIST["ecdsa_intermediate_TLSv1_p25"]}
CIPHER_LIST["ecdsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256 ECDHE-ECDSA-AES128-SHA"'
CIPHER_LIST["ecdsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256"'
CIPHER_LIST["ecdsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["ecdsa_intermediate_TLSv1_2_p25"]}
# ECDSA + RSA fallback, dual cert support (Port 25):
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_p25"]='"ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA ECDHE-ECDSA-AES128-SHA ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA"'
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_1_p25"]=${CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_p25"]}
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA DHE-RSA-AES256-SHA ARIA256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ECDHE-ECDSA-AES128-SHA ECDHE-RSA-AES128-SHA DHE-RSA-AES128-SHA ARIA128-GCM-SHA256"'
CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2_p25"]='"ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 DHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-CCM8 ECDHE-ECDSA-AES256-CCM DHE-RSA-AES256-CCM8 DHE-RSA-AES256-CCM ECDHE-ECDSA-ARIA256-GCM-SHA384 ECDHE-ARIA256-GCM-SHA384 DHE-RSA-ARIA256-GCM-SHA384 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES256-SHA384 DHE-RSA-AES256-SHA256 ARIA256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256 DHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES128-CCM8 ECDHE-ECDSA-AES128-CCM DHE-RSA-AES128-CCM8 DHE-RSA-AES128-CCM ECDHE-ECDSA-ARIA128-GCM-SHA256 ECDHE-ARIA128-GCM-SHA256 DHE-RSA-ARIA128-GCM-SHA256 ECDHE-ECDSA-AES128-SHA256 ECDHE-RSA-AES128-SHA256 DHE-RSA-AES128-SHA256 ARIA128-GCM-SHA256"'
CIPHER_LIST["ecdsa_rsa_modern_TLSv1_2_p25"]=${CIPHER_LIST["ecdsa_rsa_intermediate_TLSv1_2_p25"]}