The Rule that Wins over Every Allow
A deny policy is evaluated before any allow and stops the request whatever roles the caller holds, Owner included - the only way to say nobody deletes the audit bucket and mean it. public:all with the break-glass group excepted is the shape; a rule with no exceptions locks out break-glass too and says so; a rule conditioned on a tag denies nothing until the tag is attached, and is counted.
Verification
Static-verifiedPassed: validated and lint-clean (provider-schema-validated for AWS/Azure/GCP; Terraform-language lint elsewhere).
Conformance
- Static validation (fmt · validate · tflint)
- No applicable security policies for this provider
- Plan tests (mocked: validation rules · outputs)
Provenance
- SHA-256 checksum
- Signature (pending)
Functional
- Live test pending (no cloud run yet)
Last verified 2026-09-14 · how we verify
Use it from the registry
terraform · opentofumodule "iam_deny_policy" {
source = "www.iac-bazaar.com/iac-bazaar/gcp-iam-deny-policy/gcp"
version = "1.0.0"
}Needs a registry token from /account/tokens. The module itself is free; the account is what identifies you. Full setup: registry docs.
Inputs & outputs
Create a free account to read this module's contract
The declared contract - every input name, type, default and description, plus every output - is shown to signed-in accounts, not to anonymous visitors.
A free account sees the contract of every module in the catalogue. There is no subscription and nothing to buy - the modules are free to download, and they run under Vizier.
Documentation
gcp-iam-deny-policy
An IAM deny policy: the rule that wins over every allow. Works with
Terraform and OpenTofu (>= 1.6), google provider >= 6.0, < 7.0.
Deny is evaluated first and cannot be out-granted. Allow policies at every level add up; a deny policy is checked before any of them, and an explicit deny stops the request whatever roles the caller holds, Owner included. It is the only way to write "nobody deletes the audit bucket" and mean nobody.
principalSet://goog/public:all is how you say everyone. The usual
intent is everyone except the break-glass group: deny public:all and put
the group in exception_principals. A rule with no exceptions denies the
break-glass group too - sometimes the point, sometimes a lock-out - and
needs accept_no_break_glass.
A conditioned deny waits for its trigger. A CEL condition over resource
tags means the rule denies nothing until the tag is attached. A policy whose
every rule is conditional needs accept_only_conditional_rules;
acts_immediately reports whether anything denies on day one.
Permissions are written service.googleapis.com/verb, not the role
spelling. A validation checks the shape, because the API's error does not.
Verification
Static validation runs tofu fmt, init, validate, tflint and checkov.
This module has not yet had a live test, so it is published as statically
validated with its live test pending and does not carry the live-tested mark.
Usage code & full reference need an account
The complete copy-paste usage, the full input/output reference, and operational notes are free with an account - shown here and bundled in the download. Sign in and this section fills in.
- Usage
Related modules
gcp-firewall-policy
A global network firewall policy exists independently of any network; an association puts it in the path, and a policy with a hundred rules and none governs nobody while rendering as fully configured. enable_logging defaults to false on every rule, so a deny that fires leaves no evidence. Refuses a policy with no network, logs every rule unless told not to, and counts the disabled ones.
gcp-service-perimeter
spec is the dry-run configuration and status is the enforced one - two blocks of the same shape, and a perimeter with only a spec is evaluated on every request, logs violations, and blocks nothing. Empty restricted_services is the other way to have none: the perimeter exists, covers the projects, and governs no API.
gcp-recaptcha
A key with a testing score returns that score for every assessment, bots included - right for staging and, on a production key, a filter that filters nothing; allow_all_domains lets any site consume your assessments against your quota. Testing mode refused without acceptance, domains required on web keys, invisible scoring by default; only a backend assessment call turns a token into a decision.
gcp-cloud-ids
Creating the endpoint creates no packet mirroring policy, so an endpoint with nothing mirrored is provisioned, billed by the hour, shown with a green check and has never seen a packet. The mirroring policy is created with it and refused when it mirrors nothing. Cloud IDS detects and never blocks; blocks_traffic is an output that is always false.
gcp-cloud-armor
A global Cloud Armor WAF policy with preconfigured OWASP SQLi and XSS rules enforcing by default, an optional per-client rate limit, and custom IP allow/deny rules - attachable to many backends.
gcp-security-command-center
The findings page is not a pager: a project accumulates thousands of findings with nobody having received a message, and a mute rule silences a whole category, now and in future, with no record why. Streams CRITICAL and HIGH findings to a Pub/Sub topic as a requirement, refuses a mute without a written reason, and refuses a custom detector created DISABLED, which is listed and evaluates nothing.