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kubescape / node-agent

Kubescape eBPF agent 🥷🏻
https://kubescape.io/
Apache License 2.0
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Removing unused file and adding hardlink where possible #246

Closed amitschendel closed 7 months ago

amitschendel commented 7 months ago

User description

Overview

Type

enhancement, bug_fix

Description

Changes walkthrough

Relevant files
Enhancement
exec.go
Enhance Exec Tracing Configuration                                             
pkg/containerwatcher/v1/exec.go
  • Added GetPaths: true to the tracerexec.Config to enhance exec tracing
    capabilities.
    		•  +1/-1     
    clamav.go
    Include Hardlink Information in Malware Detection Results
    pkg/malwaremanager/v1/clamav/clamav.go
  • Included hardlink information in the GenericMalwareResult structure.
    		•  +4/-1     
    r0001_unexpected_process_launched.go
    Enhance Unexpected Process Launch Detection with Hardlink Info
    pkg/ruleengine/v1/r0001_unexpected_process_launched.go
  • Added hardlink information to the GenericRuleFailure structure for
    unexpected process launch detection.
    		•  +4/-1     
    r0007_kubernetes_client_executed.go
    Enhance Kubernetes Client Execution Detection                       
    pkg/ruleengine/v1/r0007_kubernetes_client_executed.go
  • Enhanced Kubernetes client execution detection with hardlink
    information.
    		•  +5/-2     
    r1000_exec_from_malicious_source.go
    Update and Enhance Malicious Source Execution Detection   
    pkg/ruleengine/v1/r1000_exec_from_malicious_source.go
  • Removed outdated comments regarding malicious execs hiding.
  • Enhanced malicious source execution detection with hardlink
    information.
    		•  +5/-7     
    r1004_exec_from_mount.go
    Enhance Exec from Mount Detection                                               
    pkg/ruleengine/v1/r1004_exec_from_mount.go - Enhanced exec from mount detection with `hardlink` information.
    		+5/-3     
    r1005_fileless_execution.go
    Enhance Fileless Execution Detection with Hardlink Info   
    pkg/ruleengine/v1/r1005_fileless_execution.go
  • Added comments regarding the detection of malicious execs via
    /proc/self/fd.
  • Enhanced fileless execution detection with hardlink information.
    		•  +10/-2   
    Bug_fix
    gen_rule_files.py
    Remove Deprecated Rule Generation Script                                 
    pkg/ruleengine/v1/gen_rule_files.py - Removed the deprecated script used for generating rule files.
    		+0/-144 

    ✨ PR-Agent usage: Comment /help on the PR to get a list of all available PR-Agent tools and their descriptions

    codiumai-pr-agent-free[bot] commented 7 months ago

    PR Description updated to latest commit (https://github.com/kubescape/node-agent/commit/27131ff27fa84f60b1a73469a14ca29db9477a84)

    codiumai-pr-agent-free[bot] commented 7 months ago

    PR Review

    ⏱️ Estimated effort to review [1-5] 2, because the changes are focused on enhancing existing functionalities and removing unused code. The modifications are straightforward and localized to specific areas, making the review process relatively easy.
    🧪 Relevant tests No
    🔍 Possible issues Possible Bug: The use of `execEvent.ExePath` in conditions alongside `filepath.Base(execPath)` without clear documentation or comments might lead to confusion or bugs in the future. It's important to ensure that the logic for these conditions is correctly implemented and tested.
    Consistency Issue: The removal of comments regarding the significance of `/proc/self/fd/` in `pkg/ruleengine/v1/r1000_exec_from_malicious_source.go` and then re-adding similar comments in `pkg/ruleengine/v1/r1005_fileless_execution.go` might indicate inconsistency in code documentation practices. It's beneficial to maintain consistent and clear documentation, especially when it concerns security-related features.
    🔒 Security concerns No
    ✨ Review tool usage guide:
    **Overview:** The `review` tool scans the PR code changes, and generates a PR review which includes several types of feedbacks, such as possible PR issues, security threats and relevant test in the PR. More feedbacks can be [added](https://pr-agent-docs.codium.ai/tools/review/#general-configurations) by configuring the tool. The tool can be triggered [automatically](https://pr-agent-docs.codium.ai/usage-guide/automations_and_usage/#github-app-automatic-tools-when-a-new-pr-is-opened) every time a new PR is opened, or can be invoked manually by commenting on any PR. - When commenting, to edit [configurations](https://github.com/Codium-ai/pr-agent/blob/main/pr_agent/settings/configuration.toml#L23) related to the review tool (`pr_reviewer` section), use the following template: ``` /review --pr_reviewer.some_config1=... --pr_reviewer.some_config2=... ``` - With a [configuration file](https://pr-agent-docs.codium.ai/usage-guide/configuration_options/), use the following template: ``` [pr_reviewer] some_config1=... some_config2=... ``` See the review [usage page](https://pr-agent-docs.codium.ai/tools/review/) for a comprehensive guide on using this tool.
    codiumai-pr-agent-free[bot] commented 7 months ago

    PR Code Suggestions

    CategorySuggestions                                                                                                                                                       
    Best practice
    Handle errors immediately after function calls that return them. ___ **Consider handling the error returned by tracerexec.NewTracer immediately after its
    declaration to ensure that any errors are caught and handled properly before proceeding
    with the execution.** [pkg/containerwatcher/v1/exec.go [40-42]](https://github.com/kubescape/node-agent/pull/246/files#diff-95bba503637ab3f7e32434d1cb37b47e08ccd06907135350e6404febddf55f0eR40-R42) ```diff tracerExec, err := tracerexec.NewTracer(&tracerexec.Config{MountnsMap: execMountnsmap, GetPaths: true}, ch.containerCollection, ch.execEventCallback) if err != nil { + return fmt.Errorf("creating tracer: %w", err) +} ```
    Enhancement
    Add more key-value pairs to the Arguments map for detailed alerts. ___ **Ensure that the Arguments map includes all necessary keys and values for a comprehensive
    alert. It seems like adding only "hardlink": execEvent.ExePath might not be sufficient for
    a detailed analysis or response.** [pkg/malwaremanager/v1/clamav/clamav.go [116-118]](https://github.com/kubescape/node-agent/pull/246/files#diff-946a7b5957a07b2ec4516a5a7e935c1b17de7cb6a27511e48463ed6f3d8cd159R116-R118) ```diff Arguments: map[string]interface{}{ "hardlink": execEvent.ExePath, + // Consider adding more relevant keys and values here }, ```
    Add logging for detected executions from malicious sources. ___ **Consider adding logging for each condition where execution from a malicious source is
    detected. This can aid in debugging and provide more context in security investigations.** [pkg/ruleengine/v1/r1000_exec_from_malicious_source.go [78]](https://github.com/kubescape/node-agent/pull/246/files#diff-00351ce4b75a85e267a68663f357265bbcc7721c2e461fa6112363fdfb2150c5R78-R78) ```diff if strings.HasPrefix(execPath, maliciousExecPathPrefix) || strings.HasPrefix(execEvent.Cwd, maliciousExecPathPrefix) || strings.HasPrefix(execEvent.ExePath, maliciousExecPathPrefix) { + logger.L().Info("Detected execution from a malicious source", "execPath", execPath, "cwd", execEvent.Cwd, "exePath", execEvent.ExePath) ```
    Implement comprehensive checks for fileless execution detection. ___ **To enhance the detection of fileless execution, consider implementing additional checks
    for memory-mapped files or other advanced techniques beyond simple path prefixes.** [pkg/ruleengine/v1/r1005_fileless_execution.go [119]](https://github.com/kubescape/node-agent/pull/246/files#diff-ef0155bc510f47092b9799316b90b72f6eda3347ee96da897e27fe9961f06792R119-R119) ```diff -if strings.HasPrefix(execPath, "/proc/self/fd") || strings.HasPrefix(execEvent.Cwd, "/proc/self/fd") || strings.HasPrefix(execEvent.ExePath, "/proc/self/fd") { +if isFilelessExecution(execPath, execEvent) { + // Implement isFilelessExecution with comprehensive checks ```
    Maintainability
    Refactor condition checks into a separate function. ___ **Refactor the condition to check for Kubernetes clients into a separate function for better
    readability and maintainability.** [pkg/ruleengine/v1/r0007_kubernetes_client_executed.go [135]](https://github.com/kubescape/node-agent/pull/246/files#diff-c7f3697d600957bfc81d25f2f4f3ad77f03a09775a62f1a878856621f88ad653R135-R135) ```diff -if slices.Contains(kubernetesClients, filepath.Base(execPath)) || slices.Contains(kubernetesClients, event.ExePath) { +if isKubernetesClient(execPath, event.ExePath) { ```
    ✨ Improve tool usage guide:
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    github-actions[bot] commented 7 months ago

    Summary: