rbac-police

Retrieve the RBAC permissions of Kubernetes identities - service accounts, pods, nodes, users and groups - and evaluate them using policies written in Rego.

The policy library includes over 20 policies that detect identities possessing risky permissions, each alerting on a different attack path.

Quick Start

1. Clone the repository:

   git clone https://github.com/yuvalavra/rbac-police && cd rbac-police

2. Either install rbac-police from a release:

   OS=linux  # OS=darwin
   ARCH=amd64  # ARCH=arm64
   LATEST_TAG=$(curl -s https://api.github.com/repos/yuvalavra/rbac-police/releases/latest | jq -r '.tag_name')
   curl -L -o rbac-police "https://github.com/yuvalavra/rbac-police/releases/download/${LATEST_TAG}/rbac-police_${LATEST_TAG}_${OS}_${ARCH}" && chmod +x rbac-police

   Or build it with Golang>=1.16:

   go build

3. Connect kubectl to a Kubernetes cluster.

4. Evaluate RBAC permissions and identify privilege escalation paths in your cluster using the default policy library:

   ./rbac-police eval lib/
   

5. Inspect the permissions of violating principals and identify the Roles and ClusterRoles granting them risky privileges. See the Recommendations section here for remediation advice.

   ./rbac-police expand -z sa=production-ns:violating-sa
   

Usage

Set severity threshold

Only evaluate policies with a severity equal to or higher than a threshold.

./rbac-police eval lib/ -s High

Inspect the permissions of specific identities

./rbac-police expand -z sa=kube-system:metrics-server
./rbac-police expand -z [email protected]
./rbac-police expand # all identities

Discover protections

Improve accuracy by considering features gates and admission controllers that can protect against certain attacks. Note that NodeRestriction is identified by impersonating a node and dry-run creating a pod, which may be logged by some systems.

./rbac-police eval lib/ -w

Configure violation types

Control which identities are evaluated for violations, default are sa,node,combined (see policies.md for more information).

./rbac-police eval lib/ --violations sa,user
./rbac-police eval lib/ --violations all # sa,node,combined,user,group

Note that by default, rbac-police only looks into service accounts assigned to a pod. Use -a to include all service accounts.

Scope to a namespace

Only look into service accounts and pods from a certain namespace.

./rbac-police eval lib/ -n production

Only SAs that exist on all nodes

Only alert on service accounts that exist on all nodes. Useful for identifying violating DaemonSets.

./rbac-police eval lib/ --only-sas-on-all-nodes

Ignore control plane

Ignore control plane pods and nodes in clusters that host the control plane.

./rbac-police eval lib/ --ignore-controlplane

Collect once for multiple evaluations

./rbac-police collect -o rbacDb.json

./rbac-police eval lib/ rbacDb.json -s High
./rbac-police eval lib/ rbacDb.json -s Medium --only-sas-on-all-nodes
./rbac-police expand rbacDb.json -z sa=ns:violating-sa

Documentation

• Policies
• Eval command
• Collect command
• Expand command

Media Mentions

Radiohead:

rbac-police, I've given all I can. It's not enough...

N.W.A:

rbac-police comin' straight from the underground!