NETOBSERV-1101: secure GRPC connection

[jotak]

• Add TLS and mTLS configuration to allow secure GRPC (when not using Kafka), on the same model than Kafka TLS
• Log a warning when insecure is used

(opening as draft as I did not test yet)

Related PRs:

• FLP: NETOBSERV-1101: support [Mutual] TLS for grpc server flowlogs-pipeline#469
• Operator: WIP

[openshift-ci-robot]

@jotak: This pull request references NETOBSERV-1101 which is a valid jira issue.

In response to this:

• Add TLS and mTLS configuration to allow secure GRPC (when not using Kafka), on the same model than Kafka TLS
• Log a warning when insecure is used

(opening as draft as I did not test yet)

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-ci]

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[codecov]

Codecov Report

Merging #166 (7fda953) into main (8150ccc) will decrease coverage by 0.34%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   38.66%   38.33%   -0.34%     
==========================================
  Files          31       31              
  Lines        2255     2280      +25     
==========================================
+ Hits          872      874       +2     
- Misses       1334     1355      +21     
- Partials       49       51       +2     

Flag	Coverage Δ
unittests	38.33% <20.00%> (-0.34%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pkg/agent/agent.go	37.07% <0.00%> (-0.78%)	⬇️
pkg/agent/tls.go	0.00% <0.00%> (ø)
pkg/grpc/client.go	61.90% <66.66%> (-6.85%)	⬇️
pkg/exporter/grpc_proto.go	73.91% <100.00%> (ø)

[openshift-ci-robot]

@jotak: This pull request references NETOBSERV-1101 which is a valid jira issue.

In response to this:

• Add TLS and mTLS configuration to allow secure GRPC (when not using Kafka), on the same model than Kafka TLS
• Log a warning when insecure is used

(opening as draft as I did not test yet)

Related PRs:

• FLP: NETOBSERV-1101: support [Mutual] TLS for grpc server flowlogs-pipeline#469
• Operator: WIP

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.