Enable use of system CA store for Conjur's SSL certificate verification

[sgnn7]

Summary

Currently, we strongly enforce that the user provides Conjur certificate via CONJUR_SSL_CERTIFICATE or CONJUR_CERT_FILE. This does not support a valid use case where the cert is installed on the system itself and the system CA store can be used.

Steps to Reproduce

Steps to reproduce the behavior:

1. Don't set CONJUR_SSL_CERTIFICATE or CONJUR_CERT_FILE
2. Run the authenticator

Expected Results

System CA store is used

Actual Results (including error logs, if applicable)

Error exit

Reproducible

• Always
• Sometimes
• Non-Reproducible

Version/Tag number

Latest (0.18.1)

Environment setup

Any

Additional Information

Note: This use case may not be very common due to the fact that usual deployment is with a bare container containing just the binary but it's a valid one