[MESOS-9972] Update Names for TLS-related environment variables in libprocess.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.9.1, 1.10.0
• Labels: libprocess ssl tls
• Target Version/s: 1.9.1, 1.10.0
• Sprint: Foundations: RI-18 55
• Story Points: 5
• Assignee: Benno Evers
• Reporter: Benno Evers
• Created: 18/Sep/19 10:31
• Updated: 19/Mar/20 22:36
• Resolved: 20/Sep/19 18:28

Description

The environment variables `LIBPROCESS_SSL_VERIFY_CERT` and `LIBPROCESS_SSL_REQUIRE_CERT` regularly cause confusion because they do not precisely describe their function.

In particular, one might mistakenly assume that certificates are not required when setting `LIBPROCESS_SSL_REQUIRE_CERT=false`, or that all certificates are verified when `LIBPROCESS_SSL_VERIFY_CERT=true`.

We should rename the options to `LIBPROCESS_SSL_VERIFY_SERVER_CERT` and `LIBPROCESS_SSL_REQUIRE_CLIENT_CERT` to make the semantics more clear.