I am checking TLS certificates chain validity against CA sore in this path:
I use Ubuntu 18.04 and OpenSSL 1.1.0g. I need to know whether this CAs store is from Ubuntu or OpenSSL?
OpenSSL has no own CA store although it has a default location where it will look for a CA store. On Debian/Ubuntu this default location is
/usr/lib/ssl/certs which is a link to
/etc/ssl/certs/ca-certificates.crt (note the leading '/' since this is an absolute path) is created from the certificates in
/etc/ssl/certs using the update-ca-certificates program which is part of Ubuntu and Debian and run automatically on installation and when needed on software updates. The certificates which are in
/etc/ssl/certs by default are part of the ca-certificates package.