I asked this on the Envoy Slack earlier this week, but no response
there so I'll try here.
According to
https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/security/ssl#arch-overview-ssl-enabling-verification
If you want to validate the other side's certificate, using
validation_context.trusted_ca, and you want Envoy to use the system's
default CA bundle, you have to explicitly put that path as a
filename string inside your validation_context.trusted_ca, yes?
Is there no way to tell Envoy "please validate using the system's
default bundle", without giving it the hardcoded path?
-- Cos