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75 lines
2.6 KiB
YAML
75 lines
2.6 KiB
YAML
id: gcloud-vm-project-ssh-keys-enabled
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info:
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name: Block Project-Wide SSH Keys Not Enabled
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author: princechaddha
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severity: medium
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description: |
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Ensure that your Google Compute Engine instances are configured to ignore GCP project-wide (shared) public SSH keys and use instance-level SSH keys instead. Project-wide SSH keys can be used to log in to all the VM instances running inside a GCP project. While project-wide SSH keys can ease SSH key management, if compromised, they pose a security risk which can impact all VM instances within the project.
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impact: |
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Using project-wide SSH keys increases the attack surface - if compromised, an attacker could gain access to all VM instances in the project instead of just a single instance.
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remediation: |
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Enable "Block Project-Wide SSH Keys" feature for your VM instances and configure instance-specific SSH keys instead. This limits the impact if any single key is compromised.
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reference:
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- https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ComputeEngine/enable-block-project-wide-ssh-keys.html
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- https://cloud.google.com/compute/docs/instances/adding-removing-ssh-keys
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tags: cloud,devops,gcp,gcloud,compute,security,ssh,gcp-cloud-config
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flow: |
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code(1)
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for(let projectId of iterate(template.projectIds)){
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set("projectId", projectId)
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code(2)
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for(let instance of iterate(template.instances)){
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instance = JSON.parse(instance)
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set("instanceName", instance.name)
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set("zone", instance.zone)
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code(3)
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}
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}
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self-contained: true
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code:
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- engine:
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- sh
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- bash
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source: |
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gcloud projects list --format="json(projectId)"
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extractors:
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- type: json
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name: projectIds
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internal: true
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json:
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- '.[].projectId'
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- engine:
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- sh
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- bash
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source: |
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gcloud compute instances list --project $projectId --format="json(name,zone.basename())"
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extractors:
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- type: json
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name: instances
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internal: true
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json:
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- '.[]'
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- engine:
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- sh
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- bash
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source: |
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gcloud compute instances describe $instanceName --zone $zone --project $projectId --format="json(metadata.items)"
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matchers:
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- type: word
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words:
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- "null"
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extractors:
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- type: dsl
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dsl:
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- '"VM instance " + instanceName + " in zone " + zone + " of project " + projectId + " is not configured to block project-wide SSH keys"'
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# digest: 490a0046304402207f53624c0d249b3aac27bf5fb31e65c05aec746010620bd810326b22598254f00220109787c755180220327be63e40bf99f95211d459a00abb5adb61d89e9b55afa1:922c64590222798bb761d5b6d8e72950 |