cloudarmor-mcp

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MCP server for Google Cloud Armor WAF log patrol — deny summaries per rule, home-region false-positive checks, and preview (dry-run) rule review, straight from Cloud Logging.

Built for a daily "is the WAF healthy?" patrol: one daily_brief call answers what did we block, did we block anyone we shouldn't have, and are the preview rules ready to promote.

Documentation: https://shigechika.github.io/cloudarmor-mcp/

Tools

Tool	Purpose
`daily_brief`	One-call morning summary: enforced DENYs by rule priority, home-region false-positive lens, preview DENYs
`enforce_denies`	Enforced DENY counts per rule priority
`home_region_denies`	Enforced DENYs whose source IP geolocates to your home region — anything not marked known-normal is a false-positive candidate
`preview_denies`	Preview (dry-run) DENY counts — a quiet preview rule is a promotion candidate
`health_check`	Version, config presence, and a minimal Cloud Logging probe

All tools are read-only. Counts are hard-capped (default 2000 entries per query) and a capped result is reported as >= N (capped), never as an exact total.

Setup

1. Least-privilege service account

Create a service account with roles/logging.viewer only and download a key. Unlike human accounts, service accounts are not subject to organization re-authentication policies, so an unattended patrol never silently expires.

gcloud iam service-accounts create waf-log-viewer --project=YOUR_PROJECT
gcloud projects add-iam-policy-binding YOUR_PROJECT \
  --member=serviceAccount:waf-log-viewer@YOUR_PROJECT.iam.gserviceaccount.com \
  --role=roles/logging.viewer
gcloud iam service-accounts keys create key.json \
  --iam-account=waf-log-viewer@YOUR_PROJECT.iam.gserviceaccount.com

2. Install

pip install cloudarmor-mcp
# or
uv tool install cloudarmor-mcp

3. Environment variables

Variable	Required	Meaning
`CLOUDARMOR_PROJECT`	yes	GCP project ID that receives the load-balancer logs
`GOOGLE_APPLICATION_CREDENTIALS`	yes	Path to the service-account key file
`CLOUDARMOR_BACKEND_SERVICES`	no	Comma-separated backend service names to filter (default: all)
`CLOUDARMOR_HOME_REGION`	no	ISO region code treated as home traffic, e.g. `JP`. Enables the false-positive lens
`CLOUDARMOR_RULES_INI`	no	Path to a rules INI (labels + known-normal priorities, see below)
`CLOUDARMOR_MAX_ENTRIES`	no	Max entries fetched per query (default 2000)

4. Optional rules INI

Keep your rule numbering out of prompts and give the reports human-readable labels:

[rules]
101 = block non-home deep-path crawlers
500 = AutoDiscover probe block
1002 = OWASP LFI protection

[home]
; home-region DENYs on these priorities are expected, not false positives
known_normal_priorities = 500, 600

5. Claude Code

claude mcp add cloudarmor -- cloudarmor-mcp

with the environment variables above in the server's env.

CLI

cloudarmor-mcp --version   # print version
cloudarmor-mcp --check     # config + API probe (exit 0 when healthy)
cloudarmor-mcp --brief     # print daily_brief to stdout (cron / smoke tests)

Reading the report

Enforced DENY by rule — your normal blocking volume. Sudden shifts in the mix are worth a look.
Home-region DENY — requests from your own country/region that were blocked. Legitimate users and legitimate crawlers being denied show up here; scanner traffic that happens to originate locally will too, so the known_normal_priorities list keeps expected rules (e.g. an AutoDiscover block) out of the suspicious list.
Preview DENY — rules in dry-run. A preview rule that stays free of home-region hits over time is a candidate for promotion to enforce.

License

MIT

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