C-0048 - fix to valid remediation

[YiscahLevySilas1]

User description

Overview

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Type

enhancement, bug_fix

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Description

• Enhanced hostPath volume detection logic to include volumeMounts paths in the alert details, providing a more comprehensive view of the security issue.
• Added a new helper function volume_mounts to efficiently find and include the matching volume mounts in the alert paths.
• Updated expected test results to reflect the new alert structure, ensuring test accuracy.
• Fixed a mismatch in the test deployment volume name to align with the expected volumeMounts.

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Changes walkthrough

	Relevant files
Enhancement	raw.rego Enhance HostPath Volume Detection with VolumeMounts            rules/alert-any-hostpath/raw.rego Enhanced hostPath volume detection by including volumeMounts in the alert paths. Concatenated the original dangerous volume path with the new volumeMounts paths for a comprehensive alert detail. Introduced a new helper function volume_mounts to find the matching volume mounts. +23/-8
Tests	expected.json Update Expected Test Results for Deployment with VolumeMounts rules/alert-any-hostpath/test/deployment/expected.json Updated expected test results to include both volume and volumeMounts paths in deletePaths and failedPaths. +12/-8    expected.json Update Expected Test Results for Pod with VolumeMounts      rules/alert-any-hostpath/test/pod/expected.json Updated expected test results for pod to reflect the new alert structure with volume and volumeMounts paths. +26/-22
Bug_fix	deployment.yaml Fix Test Deployment Volume Name                                                    rules/alert-any-hostpath/test/deployment/input/deployment.yaml Corrected the volume name in the test deployment to match the expected volumeMounts. +1/-1

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PR Description updated to latest commit (d956002)

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PR Review

⏱️ Estimated effort to review [1-5]	2, because the changes are focused on enhancing the detection logic for hostPath volumes and include updates to the test cases to reflect these changes. The logic is straightforward and well-contained within specific functions, making it easier to review. The addition of volume mounts in the alert details is a logical extension of the existing functionality.
🧪 Relevant tests	Yes
🔍 Possible issues	Possible Bug: The implementation assumes that every volume will have a corresponding volumeMount in every container. This might not always be the case, leading to potential mismatches or missed alerts if a volume is not mounted in a container.
	Data Structure Assumption: The code assumes that volumeMounts will always be present in the container spec. If volumeMounts is omitted (which is valid when a container does not mount any volumes), this could lead to runtime errors.
🔒 Security concerns	No

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PR Code Suggestions

Category	Suggestions
Possible issue	Ensure the variable j is properly defined and iterated over containers. It seems the variable j in the expressions pod.spec.containers[j].volumeMounts and similar lines is not defined within the scope of the code snippet provided. This could lead to runtime errors. Ensure that j is properly defined and iterated over the containers array. For example, you might need to wrap the code block in a loop that iterates over each container in the pod/workload. rules/alert-any-hostpath/raw.rego [12-65] -volumeMounts := pod.spec.containers[j].volumeMounts -volumeMounts := wl.spec.template.spec.containers[j].volumeMounts -volumeMounts := wl.spec.jobTemplate.spec.template.spec.containers[j].volumeMounts +for j := range pod.spec.containers { + volumeMounts := pod.spec.containers[j].volumeMounts + ... +}
Bug	Iterate over volumeMounts within the volume_mounts function. The function volume_mounts is called with volumeMounts as an argument, but inside the function, it attempts to access volume_mounts[j].name without defining or iterating over j. To fix this, you should iterate over volumeMounts within the function to compare each mount's name. rules/alert-any-hostpath/raw.rego [87-89] -volume_mounts(name, volume_mounts, str) = [path] { - name == volume_mounts[j].name +volume_mounts(name, volumeMounts, str) = [path] { + some j + name == volumeMounts[j].name path := sprintf("%s.volumeMounts[%v]", [str, j]) } else = []
	Correct the format string in sprintf to include a format specifier. The sprintf function is used with a format string that seems to be missing a format specifier (%v) for volumes[%v]. Ensure the format string correctly includes the specifier to avoid runtime errors or incorrect path formatting. rules/alert-any-hostpath/raw.rego [84] -path = sprintf("%vvolumes[%v]", [start_of_path, format_int(i, 10)]) +path = sprintf("%svolumes[%v]", [start_of_path, format_int(i, 10)])
Enhancement	Ensure result is an array before concatenating with pathMounts. The array.concat function is used to combine result and pathMounts. However, if result is a single element and not an array, this could lead to unexpected behavior. Ensure that result is wrapped in an array if it's not already an array to avoid issues. rules/alert-any-hostpath/raw.rego [15-67] -finalPath := array.concat([result], pathMounts) +finalPath := array.concat([result] if not is_array(result) else result, pathMounts)
Best practice	Use a single source of truth for deletePaths and failedPaths. The deletePaths and failedPaths fields are assigned the same value of finalPath. If the intention is for these fields to always mirror each other, consider using a single source of truth or documenting this behavior to avoid confusion and potential errors in future modifications. rules/alert-any-hostpath/raw.rego [21-74] -"deletePaths": finalPath, -"failedPaths": finalPath, +paths := finalPath +"deletePaths": paths, +"failedPaths": paths,

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[matthyx]

based on the unit test outputs this is exactly what I want 👍

[github-actions]

Summary:

• License scan: failure
• Credentials scan: failure
• Vulnerabilities scan: failure
• Unit test: success
• Go linting: success