fix C-0069 - anonymous auth disabled by default

[YiscahLevySilas1]

User description

Overview

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Type

bug_fix

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Description

• Adjusted anonymous authentication detection logic in raw.rego to no longer alert when anonymous auth is not explicitly disabled via command-line arguments, but rather only if explicitly enabled in the kubelet configuration file.
• Updated test expectations and inputs to align with the new detection logic for anonymous authentication.

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Changes walkthrough

	Relevant files
Bug fix	raw.rego Adjust Anonymous Authentication Detection Logic                    rules/anonymous-requests-to-kubelet-updated/raw.rego Removed the rule that triggers an alert when anonymous authentication is not explicitly disabled via command-line arguments. Adjusted the rule to trigger an alert only if anonymous authentication is explicitly enabled in the kubelet configuration file. +1/-20
Tests	expected.json Update Test Expectations for Anonymous Auth Checks              rules/anonymous-requests-to-kubelet-updated/test/invalid-config-no-value/expected.json Removed all expected alerts for tests involving configurations where anonymous authentication setting is not explicitly defined, reflecting the new logic. +1/-28    expected.json Align Test Expectations with Updated Auth Logic                    rules/anonymous-requests-to-kubelet-updated/test/no-cli-params/expected.json Removed all expected alerts for tests involving missing command-line parameters for anonymous authentication, aligning with the updated detection logic. +1/-22    kubelet-info.json Update Test Input for Anonymous Auth Configuration              rules/anonymous-requests-to-kubelet-updated/test/valid-cli/input/kubelet-info.json Updated test input to reflect the scenario where anonymous authentication is not explicitly disabled via command-line but is disabled in the configuration file. +1/-1

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PR Description updated to latest commit (https://github.com/kubescape/regolibrary/commit/54d0c7d65d8c9f14fe263d889ad9dc37f4ab48fe)

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PR Review

⏱️ Estimated effort to review [1-5]	2, because the changes are focused and involve specific logic adjustments in the detection of anonymous authentication settings in kubelet configurations. The modifications are straightforward and localized to a single Rego file and associated test files.
🧪 Relevant tests	Yes
🔍 Possible issues	Possible Regression: The removal of the check for the absence of "--anonymous-auth" and "--config" command-line arguments might lead to scenarios where anonymous authentication is inadvertently allowed due to misconfigurations not caught by this logic.
🔒 Security concerns	No

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PR Code Suggestions

Category	Suggestions
Enhancement	Change the condition to check if anonymous authentication is not explicitly disabled. ___ **It seems like the condition yamlConfig.authentication.anonymous.enabled == true is directly asserting that anonymous authentication is enabled without considering the possibility that the configuration might not explicitly set this field, thus defaulting to the Kubernetes default (which might vary between versions). A safer approach would be to check if the field is not explicitly set to false, which would cover more cases and ensure that the policy is effective even if the configuration defaults change.** [rules/anonymous-requests-to-kubelet-updated/raw.rego [36]](https://github.com/kubescape/regolibrary/pull/615/files#diff-a84785820ea9ae2cdb37df951ad48ad8a568fdbbcbe87478895868dfb46e2588R36-R36) ```diff -yamlConfig.authentication.anonymous.enabled == true +not yamlConfig.authentication.anonymous.enabled == false ```
	Add a test case for implicitly enabled anonymous authentication. ___ **The test case expected.json for invalid configurations without a value has been changed to an empty array [], which might not accurately test the behavior of the policy when anonymous authentication is implicitly enabled (by not being explicitly disabled). It would be beneficial to include a test case that ensures the policy triggers an alert when the configuration does not explicitly disable anonymous authentication, reflecting more realistic scenarios.** [rules/anonymous-requests-to-kubelet-updated/test/invalid-config-no-value/expected.json [1]](https://github.com/kubescape/regolibrary/pull/615/files#diff-22bded34abd6510e4f915fda41dc36b39ce1942168079fcb56b3b585a019495eR1-R1) ```diff -[] +[{ + "alertMessage": "Anonymous requests is enabled.", + "alertScore": 7, + "failedPaths": ["authentication.anonymous.enabled"], + "fixPaths": ["authentication.anonymous.enabled"], + "packagename": "armo_builtins" +}] ```
	Add a test case for scenarios with no CLI parameters where anonymous authentication might be enabled by default. ___ **Similar to the previous suggestion, the test case for scenarios with no CLI parameters has been reduced to an empty array []. This change might miss testing the policy's ability to detect and alert on configurations where anonymous authentication is enabled by default or not explicitly disabled. Consider adding a detailed test case that verifies the policy's effectiveness in such scenarios.** [rules/anonymous-requests-to-kubelet-updated/test/no-cli-params/expected.json [1]](https://github.com/kubescape/regolibrary/pull/615/files#diff-ecc1f959a13f9554e78fc0935b73bbfc6356eef6470286b5445b5a49af1a75cdR1-R1) ```diff -[] +[{ + "alertMessage": "Anonymous requests is enabled.", + "alertScore": 7, + "failedPaths": [], + "fixPaths": ["authentication.anonymous.enabled"], + "packagename": "armo_builtins" +}] ```
	Include command line scenarios both with and without the --anonymous-auth=false flag. ___ **The modification in kubelet-info.json removes the --anonymous-auth=false flag from the command line, which is a significant change for testing the policy's behavior. However, to ensure comprehensive testing, it would be beneficial to include both scenarios: one with the flag explicitly set to false and another without the flag. This approach would help verify that the policy correctly interprets the absence of the flag as not explicitly disabling anonymous authentication.** [rules/anonymous-requests-to-kubelet-updated/test/valid-cli/input/kubelet-info.json [5]](https://github.com/kubescape/regolibrary/pull/615/files#diff-3243da95e28d4ff97248f77d47eeb0977b01f1afa2b2b6a121f6e33c0027ad87R5-R5) ```diff -"cmdLine": "/var/lib/minikube/binaries/v1.23.1/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --config=ss", +"cmdLine": "/var/lib/minikube/binaries/v1.23.1/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --anonymous-auth=false --config=ss", ```

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