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tls: re-define max supported version as 1.2

Several secureProtocol strings allow any supported TLS version as the
maximum, but our maximum supported protocol version is TLSv1.2 even if
someone configures a build against an OpenSSL that supports TLSv1.3.

Fixes: #24658

PR-URL: #25024
Reviewed-By: Richard Lau <>
Reviewed-By: Ben Noordhuis <>
Reviewed-By: Daniel Bevenius <>
Reviewed-By: Colin Ihrig <>
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sam-github authored and MylesBorins committed Nov 28, 2018
1 parent 2516e9c commit e340b8f1ffed92067e945d89fdb225a00a52f830
Showing with 6 additions and 0 deletions.
  1. +6 −0 src/
@@ -501,6 +501,12 @@ void SecureContext::Init(const FunctionCallbackInfo<Value>& args) {

SSL_CTX_set_min_proto_version(sc->ctx_.get(), min_version);

if (max_version == 0) {
// Selecting some secureProtocol methods allows the TLS version to be "any
// supported", but we don't support TLSv1.3, even if OpenSSL does.
max_version = TLS1_2_VERSION;
SSL_CTX_set_max_proto_version(sc->ctx_.get(), max_version);
// OpenSSL 1.1.0 changed the ticket key size, but the OpenSSL 1.0.x size was
// exposed in the public API. To retain compatibility, install a callback

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