Agent skill

performing-cloud-asset-inventory-with-cartography

Perform comprehensive cloud asset inventory and relationship mapping using Cartography to build a Neo4j security graph of infrastructure assets, IAM permissions, and attack paths across AWS, GCP, and Azure.

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SKILL.md

Performing Cloud Asset Inventory with Cartography

Overview

Cartography is a CNCF sandbox project (originally created at Lyft) that consolidates infrastructure assets and their relationships into a Neo4j graph database. It queries cloud APIs to discover resources, maps relationships between them, and enables security teams to identify attack paths, generate asset reports, and find areas for security improvement. The graph model reveals hidden connections such as IAM permission chains, network paths, and cross-account trust relationships.

Prerequisites

  • Python 3.8+
  • Neo4j 4.x or 5.x database
  • Cloud provider credentials (AWS, GCP, Azure)
  • Docker (optional, for Neo4j deployment)
  • Minimum 4GB RAM for Neo4j, more for large environments

Installation

bash
# Install Cartography
pip install cartography

# Verify installation
cartography --help

Deploy Neo4j with Docker

bash
docker run -d \
  --name neo4j \
  -p 7474:7474 -p 7687:7687 \
  -e NEO4J_AUTH=neo4j/changethispassword \
  -e NEO4J_PLUGINS='["apoc"]' \
  -v neo4j_data:/data \
  neo4j:5-community

Running Cartography

Basic AWS Sync

bash
# Sync AWS account data to Neo4j
cartography \
  --neo4j-uri bolt://localhost:7687 \
  --neo4j-user neo4j \
  --neo4j-password-env-var NEO4J_PASSWORD

Sync specific AWS modules

bash
cartography \
  --neo4j-uri bolt://localhost:7687 \
  --neo4j-user neo4j \
  --neo4j-password-env-var NEO4J_PASSWORD \
  --aws-sync-all-profiles

GCP Sync

bash
cartography \
  --neo4j-uri bolt://localhost:7687 \
  --neo4j-user neo4j \
  --neo4j-password-env-var NEO4J_PASSWORD \
  --gcp-requested-syncs compute iam storage

Security-Focused Cypher Queries

Find all S3 buckets with public access

cypher
MATCH (b:S3Bucket)
WHERE b.anonymous_access = true
   OR b.anonymous_actions IS NOT NULL
RETURN b.name, b.anonymous_actions, b.region, b.arn
ORDER BY b.name

Identify IAM users with admin policies

cypher
MATCH (user:AWSUser)-[:POLICY]->(policy:AWSPolicy)
WHERE policy.name = 'AdministratorAccess'
   OR policy.arn CONTAINS 'AdministratorAccess'
RETURN user.name, user.arn, policy.name, user.password_last_used

Find EC2 instances exposed to internet

cypher
MATCH (instance:EC2Instance)-[:MEMBER_OF_EC2_SECURITY_GROUP]->(sg:EC2SecurityGroup)
      -[:MEMBER_OF_EC2_SECURITY_GROUP_RULE]->(rule:IpRule)
WHERE rule.fromport <= 22 AND rule.toport >= 22
  AND rule.protocol IN ['tcp', '-1']
  AND '0.0.0.0/0' IN rule.ipranges
RETURN instance.instanceid, instance.publicipaddress, sg.groupid, sg.name

Discover cross-account trust relationships

cypher
MATCH (role:AWSRole)-[:TRUSTS_AWS_PRINCIPAL]->(principal:AWSPrincipal)
WHERE principal.arn CONTAINS ':root'
  AND NOT principal.arn CONTAINS role.accountid
RETURN role.arn, role.name, principal.arn AS trusted_account
ORDER BY role.name

Find attack path from public EC2 to sensitive S3

cypher
MATCH path = (instance:EC2Instance)-[:STS_ASSUME_ROLE_ALLOWS|MEMBER_OF_EC2_SECURITY_GROUP|
  POLICY|INSTANCE_PROFILE*1..5]->(bucket:S3Bucket)
WHERE instance.publicipaddress IS NOT NULL
  AND bucket.name CONTAINS 'sensitive'
RETURN path
LIMIT 25

Identify unused IAM roles

cypher
MATCH (role:AWSRole)
WHERE role.last_used IS NULL
   OR role.last_used < datetime().epochMillis - (90 * 24 * 60 * 60 * 1000)
RETURN role.name, role.arn, role.last_used
ORDER BY role.last_used

Find Lambda functions with overprivileged roles

cypher
MATCH (func:AWSLambda)-[:STS_ASSUME_ROLE_ALLOWS]->(role:AWSRole)-[:POLICY]->(policy:AWSPolicy)
WHERE policy.name = 'AdministratorAccess'
RETURN func.name, func.arn, role.name, policy.name

Network path analysis

cypher
MATCH (vpc:AWSVpc)-[:RESOURCE]->(subnet:EC2Subnet)-[:MEMBER_OF_SUBNET]->(instance:EC2Instance)
WHERE instance.publicipaddress IS NOT NULL
RETURN vpc.id, subnet.subnetid, subnet.cidr_block, instance.instanceid,
       instance.publicipaddress, instance.state

Scheduling Regular Syncs

Cron-based sync

bash
# Add to crontab - sync every 6 hours
0 */6 * * * /usr/local/bin/cartography \
  --neo4j-uri bolt://localhost:7687 \
  --neo4j-user neo4j \
  --neo4j-password-env-var NEO4J_PASSWORD \
  >> /var/log/cartography/sync.log 2>&1

Docker Compose deployment

yaml
version: '3.8'
services:
  neo4j:
    image: neo4j:5-community
    ports:
      - "7474:7474"
      - "7687:7687"
    environment:
      NEO4J_AUTH: neo4j/securepwd123
      NEO4J_PLUGINS: '["apoc"]'
      NEO4J_dbms_memory_heap_max__size: 4G
    volumes:
      - neo4j_data:/data

  cartography:
    image: ghcr.io/cartography-cncf/cartography:latest
    depends_on:
      - neo4j
    environment:
      NEO4J_PASSWORD: securepwd123
      AWS_DEFAULT_REGION: us-east-1
    command: >
      --neo4j-uri bolt://neo4j:7687
      --neo4j-user neo4j
      --neo4j-password-env-var NEO4J_PASSWORD

volumes:
  neo4j_data:

Data Model Overview

Key Node Types

  • AWSAccount, GCPProject, AzureSubscription
  • EC2Instance, S3Bucket, RDSInstance, AWSLambda
  • AWSUser, AWSRole, AWSGroup, AWSPolicy
  • EC2SecurityGroup, EC2Subnet, AWSVpc
  • GCPInstance, GCSBucket, GCPRole

Key Relationship Types

  • RESOURCE: Account owns resource
  • POLICY: Principal has policy attached
  • STS_ASSUME_ROLE_ALLOWS: Principal can assume role
  • MEMBER_OF_EC2_SECURITY_GROUP: Instance belongs to SG
  • TRUSTS_AWS_PRINCIPAL: Cross-account trust

References

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