Auditing Gcp Iam Permissions

Ne Zaman Kullanılır

• performing yaparken security assessments of GCP organization or project IAM configurations
• identifying yaparken: service accounts with excessive permissions or unused access
• compliance yaparken: requirements mandate review of access controls and role assignments
• investigating yaparken potential lateral movement through IAM misconfigurations
• reducing yaparken: the blast radius of compromised credentials by scoping down permissions

Kullanma: for VPC firewall rule auditing (use network security tools), for GKE RBAC auditing (use Kubernetes-specific RBAC tools), or for real-time threat Tespit on IAM actions (use SCC Event Threat Tespit).

Ön Gereksinimler

• GCP organization or project with roles/iam.securityReviewer and roles/cloudAsset.viewer
• gcloud CLI authenticated with appropriate permissions
• Cloud Asset API enabled (gcloud services enable cloudasset.googleapis.com)
• IAM Recommender API enabled (gcloud services enable recommender.googleapis.com)
• Policy Analyzer API enabled (gcloud services enable policyanalyzer.googleapis.com)

İş Akışı

Adım 1: Enumerate IAM Bindings Across the Organization

List all IAM bindings at organization, folder, and project levels to understand the full access landscape.

gcloud organizations get-iam-policy ORG_ID \
  --format=json > org-iam-policy.json

gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --format="table(resource, policy.bindings.role, policy.bindings.members)" \
  --limit=500

gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy:roles/owner" \
  --format="table(resource, policy.bindings.members)"

gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy:roles/owner OR policy:roles/editor" \
  --format=json | python3 -c "
import json, sys
data = json.load(sys.stdin)
for result in data:
    resource = result.get('resource', '')
    for binding in result.get('policy', {}).get('bindings', []):
        role = binding.get('role', '')
        if role in ['roles/owner', 'roles/editor']:
            for member in binding.get('members', []):
                print(f'{resource} | {role} | {member}')
"

Adım 2: Audit Service Accounts and Their Keys

Identify service accounts with excessive permissions, user-managed keys, and unused accounts.

gcloud iam service-accounts list \
  --project=PROJECT_ID \
  --format="table(email, displayName, disabled)"

for sa in $(gcloud iam service-accounts list --project=PROJECT_ID --format="value(email)"); do
  keys=$(gcloud iam service-accounts keys list \
    --iam-account="$sa" \
    --managed-by=user \
    --format="table(name.basename(),validAfterTime,validBeforeTime)")
  if [ -n "$keys" ]; then
    echo "=== $sa ==="
    echo "$keys"
  fi
done

gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy.bindings.members:serviceAccount AND (policy:roles/owner OR policy:roles/editor OR policy:admin)" \
  --format="table(resource, policy.bindings.role, policy.bindings.members)"

for sa in $(gcloud iam service-accounts list --project=PROJECT_ID --format="value(email)"); do
  echo "=== $sa ==="
  gcloud iam service-accounts get-iam-policy "$sa" --format=json 2>/dev/null
done

Adım 3: Use IAM Recommender to Identify Excess Permissions

Leverage GCP's IAM Recommender to Bul: roles that grant more access than actually used.

gcloud recommender recommendations list \
  --project=PROJECT_ID \
  --recommender=google.iam.policy.Recommender \
  --location=global \
  --format="table(name, description, priority, stateInfo.state)"

gcloud recommender recommendations describe RECOMMENDATION_ID \
  --project=PROJECT_ID \
  --recommender=google.iam.policy.Recommender \
  --location=global \
  --format=json

gcloud recommender insights list \
  --project=PROJECT_ID \
  --insight-type=google.iam.policy.Insight \
  --location=global \
  --format="table(name, description, severity, category)"

gcloud recommender recommendations mark-claimed RECOMMENDATION_ID \
  --project=PROJECT_ID \
  --recommender=google.iam.policy.Recommender \
  --location=global \
  --etag=ETAG

Adım 4: Analyze Effective Permissions with Policy Analyzer

Use Policy Analyzer to Belirle: effective access for specific principals or resources.

gcloud asset analyze-iam-policy \
  --organization=ORG_ID \
  --full-resource-name="//storage.googleapis.com/projects/_/buckets/sensitive-data-bucket" \
  --format="table(identityList.identities, accessControlLists.accesses.role)"

gcloud asset analyze-iam-policy \
  --organization=ORG_ID \
  --identity="user:developer@company.com" \
  --format="table(accessControlLists.resources.fullResourceName, accessControlLists.accesses.role)"

gcloud asset analyze-iam-policy \
  --organization=ORG_ID \
  --full-resource-name="//cloudresourcemanager.googleapis.com/projects/PROJECT_ID" \
  --permissions="iam.serviceAccounts.actAs,iam.serviceAccountKeys.create" \
  --format="table(identityList.identities, accessControlLists.accesses.permission)"

gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy:allUsers OR policy:allAuthenticatedUsers" \
  --format="table(resource, policy.bindings.role, policy.bindings.members)"

Adım 5: Check for Domain-Wide Delegation and Impersonation Risks

Identify service accounts with domain-wide delegation and impersonation capabilities.

gcloud iam service-accounts list --project=PROJECT_ID --format=json | python3 -c "
import json, sys
accounts = json.load(sys.stdin)
for sa in accounts:
    email = sa.get('email', '')
    # Check if the SA has domain-wide delegation enabled
    # This requires Admin SDK API access
    print(f'SA: {email} - Check admin.google.com for delegation status')
"

for sa in $(gcloud iam service-accounts list --project=PROJECT_ID --format="value(email)"); do
  policy=$(gcloud iam service-accounts get-iam-policy "$sa" --format=json 2>/dev/null)
  if echo "$policy" | python3 -c "
import json, sys
p = json.load(sys.stdin)
for b in p.get('bindings', []):
    if b['role'] in ['roles/iam.serviceAccountTokenCreator', 'roles/iam.serviceAccountUser']:
        print(f'  {b[\"role\"]}: {b[\"members\"]}')
" 2>/dev/null; then
    echo "=== Impersonation risk: $sa ==="
  fi
done

Adım 6: Şunu üret:udit Report and Apply Remediation

Compile Bul:ings and implement recommended permission reductions.

gcloud projects remove-iam-policy-binding PROJECT_ID \
  --member="user:developer@company.com" \
  --role="roles/editor"

gcloud projects add-iam-policy-binding PROJECT_ID \
  --member="user:developer@company.com" \
  --role="roles/compute.viewer"

gcloud projects add-iam-policy-binding PROJECT_ID \
  --member="user:developer@company.com" \
  --role="roles/storage.objectViewer"

gcloud iam service-accounts keys delete KEY_ID \
  --iam-account=SA_EMAIL

gcloud iam service-accounts disable SA_EMAIL --project=PROJECT_ID

Key Concepts

Term	Definition
Primitive Role	Legacy GCP roles (Owner, Editor, Viewer) that grant broad permissions across all services, not recommended for production
Predefined Role	GCP-managed role scoped to specific services and actions, providing more granular access than primitive roles
IAM Recommender	GCP ML-based service that analyzes actual permission usage and suggests role reductions to achieve least privilege
Policy Analyzer	Tool for analyzing effective IAM access across the organization hierarchy, answering who-can-access-what queries
Service Account Key	User-managed credential for service account authentication, a security risk as keys can be exported and do not auto-expire
Domain-Wide Delegation	Grants a service account the ability to impersonate any user in the Google Workspace domain, a significant privilege escalation risk

Tools & Systems

• gcloud CLI: Primary tool for querying and managing GCP IAM policies, service accounts, and role bindings
• IAM Recommender: ML-based recommendation engine for reducing excessive permissions based on actual usage
• Policy Analyzer: Organization-wide effective access analysis tool for understanding who can access what
• Cloud Asset Inventory: Cross-project Ara: IAM policies and resource metadata
• ScoutSuite: Multi-cloud auditing tool with GCP IAM-specific checks for role assignments and service accounts

Common Scenarios

Scenario: Reducing Primitive Role Usage Across a GCP Organization

Context: An audit reveals that 60% of IAM bindings across the organization use primitive roles (Owner/Editor). The security team needs to migrate to predefined roles without disrupting developer workflows.

Approach:

1. Run gcloud asset search-all-iam-policies to inventory all primitive role bindings
2. Use IAM Recommender to get ML-based suggestions for replacement predefined roles
3. For each binding, use Policy Analyzer to understand what the principal actually accesses
4. Şunu oluştur: mapping document: primitive role -> specific predefined roles needed
5. Apply predefined roles alongside primitive roles for a testing period
6. Monitor for access denied errors using Cloud Audit Logs
7. Remove primitive roles after confirming no access issues over 2 weeks

Pitfalls: Primitive roles include permissions across all GCP services, so replacing them requires multiple predefined roles. The Recommender may suggest overly restrictive roles if the observation period does not capture all use cases. Custom roles can fill gaps where no predefined role matches the exact permission set needed.

Output Format

GCP IAM Permissions Audit Report
===================================
Organization: acme-org (ORG_ID: 123456789)
Projects Audited: 25
Audit Date: 2026-02-23

IAM BINDING SUMMARY:
  Total bindings:                    342
  Using primitive roles:             205 (60%)
  Using predefined roles:            112 (33%)
  Using custom roles:                 25 (7%)

CRITICAL Bul:INGS:
[IAM-001] Service Account with Owner Role
  SA: admin-sa@prod-project.iam.gserviceaccount.com
  Role: roles/owner on project prod-project
  User-Managed Keys: 3 (oldest: 14 months)
  Remediation: Replace with specific predefined roles, delete old keys

[IAM-002] allAuthenticatedUsers Binding
  Resource: gs://public-data-bucket
  Role: roles/storage.objectViewer
  Risk: Any Google account holder can read bucket contents
  Remediation: Restrict to specific user groups or service accounts

SERVICE ACCOUNT HEALTH:
  Total service accounts:            67
  With user-managed keys:            23
  Keys older than 90 days:           18
  Unused accounts (90+ days):        12
  With domain-wide delegation:        2

RECOMMENDER SUGGESTIONS:
  Total recommendations:             45
  Priority HIGH:                     12
  Estimated permissions reduced:     2,847 individual permissions

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