From 3b05e602cef7fb5ccadbd88f3b845d510ba51350 Mon Sep 17 00:00:00 2001 From: Ewoud Kohl van Wijngaarden Date: Fri, 5 Jan 2024 15:58:59 +0100 Subject: [PATCH] Only set min_version on OpenSSL < 1.1.0 Both Red Hat and Debian-like systems configure the minimum TLS version to be 1.2 by default, but allow users to change this via configs. On Red Hat and derivatives this happens via crypto-policies[1], which in writes settings in /etc/crypto-policies/back-ends/opensslcnf.config. Most notably, it sets TLS.MinProtocol there. For Debian there's MinProtocol in /etc/ssl/openssl.cnf. Both default to TLSv1.2, which is considered a secure default. In constrast, the SSLContext has a hard coded OpenSSL::SSL::TLS1_VERSION for min_version. TLS 1.0 and 1.1 are considered insecure. By always setting this in the default parameters, the system wide default can't be respected, even if a developer wants to. This takes the approach that's also done for ciphers: it's only set for OpenSSL < 1.1.0. [1]: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/security_hardening/using-the-system-wide-cryptographic-policies_security-hardening --- lib/openssl/ssl.rb | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/openssl/ssl.rb b/lib/openssl/ssl.rb index e557b8b48..83ecacafb 100644 --- a/lib/openssl/ssl.rb +++ b/lib/openssl/ssl.rb @@ -22,7 +22,6 @@ module OpenSSL module SSL class SSLContext DEFAULT_PARAMS = { # :nodoc: - :min_version => OpenSSL::SSL::TLS1_VERSION, :verify_mode => OpenSSL::SSL::VERIFY_PEER, :verify_hostname => true, :options => -> { @@ -55,6 +54,7 @@ class SSLContext if !(OpenSSL::OPENSSL_VERSION.start_with?("OpenSSL") && OpenSSL::OPENSSL_VERSION_NUMBER >= 0x10100000) DEFAULT_PARAMS.merge!( + min_version: OpenSSL::SSL::TLS1_VERSION, ciphers: %w{ ECDHE-ECDSA-AES128-GCM-SHA256 ECDHE-RSA-AES128-GCM-SHA256