cloudarmor-mcp

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 (plugin)

This repository doubles as a single-plugin marketplace, so Claude Code can install the server for you:

/plugin marketplace add shigechika/cloudarmor-mcp
/plugin install cloudarmor-mcp@cloudarmor-mcp

The plugin launches uvx cloudarmor-mcp and reads the same environment variables described in Environment variables above; export them before starting Claude Code. GOOGLE_APPLICATION_CREDENTIALS still has to point at a service-account key file that exists on your own machine — the plugin can't ship or fetch that file for you, so this server can't be fully configured through the plugin's own settings alone.

uvx must be on the PATH of the process that runs Claude Code — a login shell usually has it, but a GUI-launched app may not; install uv system-wide if the plugin fails to start.

6. Claude Code (manual)

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