A Firewall that Blocks rather than Narrates
Every security feature on this service defaults to telling you, not to stopping it: threat_intelligence_mode defaults to Alert, which logs traffic to known-malicious destinations and forwards it, and intrusion detection does the same. Deny for both here, with the DNS proxy on so FQDN rules and the client agree on an answer.
Verification
Static-verifiedPassed: validated and lint-clean (provider-schema-validated for AWS/Azure/GCP; Terraform-language lint elsewhere).
Conformance
- Static validation (fmt · validate · tflint)
- Security scan clean (Checkov)
- Plan tests (mocked: validation rules · outputs)
Provenance
- SHA-256 checksum
- Signature (pending)
Functional
- Live test pending (no cloud run yet)
Last verified 2026-09-13 · how we verify
Use it from the registry
terraform · opentofumodule "firewall" {
source = "www.iac-bazaar.com/iac-bazaar/azure-firewall/azure"
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.
Cite it in your README
badge · attributionPaste this beside the module in the repository that uses it. The badge is rendered from this artifact's verification record, so it reads static-verified because the record says so, and the link lands on this page.
[](https://www.iac-bazaar.com/catalog/azure-firewall?utm_source=syndication&utm_medium=readme&utm_campaign=artifact)
Terraform module 1.0.0, static-verified on IaC Bazaar: [A Firewall that Blocks rather than Narrates](https://www.iac-bazaar.com/catalog/azure-firewall?utm_source=syndication&utm_medium=readme&utm_campaign=artifact)
```hcl
module "firewall" {
source = "www.iac-bazaar.com/iac-bazaar/azure-firewall/azure"
version = "1.0.0"
}
```Preview:
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
azure-firewall
An Azure Firewall that blocks rather than narrates. Works with Terraform and
OpenTofu (>= 1.6), azurerm provider >= 4.0, < 5.0.
Every security feature on this service defaults to telling you, not to
stopping it. threat_intelligence_mode defaults to Alert: traffic to
addresses and domains on Microsoft's malicious-infrastructure feed is logged and
then forwarded. Intrusion detection defaults to Alert as well: the
signature fires, the alert is written, the packet is delivered. In both cases
the portal shows the feature as enabled and the dashboards fill with detections,
while nothing is prevented. Deny for both here, with
blocks_known_malicious_traffic and blocks_intrusion_signatures as outputs.
IDPS and TLS inspection exist only on the Premium SKU. On Standard, setting an intrusion detection mode is accepted by Terraform and does nothing - the worst of both worlds, since you pay for neither and believe you have one. A precondition refuses that combination.
FQDN rules in network rule collections need the DNS proxy. Without
dns_proxy_enabled, the firewall resolves the name when it evaluates the rule
and the client resolves it separately - and a round-robin or geo-routed record
can hand them different answers, so the address the client actually reaches is
not the address the rule allowed. On here.
Azure Firewall records nothing by itself. An allow or deny that was never written down cannot be reviewed, which removes the only evidence that any of the above did what it claims.
Smaller things: the subnet must be named exactly AzureFirewallSubnet and
Azure's error when it is not does not say so, so a precondition checks the name;
and three availability zones by default, because every route in the virtual
network points at this firewall by design and a single-zone deployment is a
single point of failure for all of them.
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
azure-b2c
An Azure AD B2C tenant created where its customer directory should live, on PremiumP1 or P2, linked to the subscription that pays per monthly active user. Data residency and the onmicrosoft.com name are chosen once and cannot change; user flows, policies and app registrations are configured inside the tenant with an azuread provider pointed at the exported tenant ID.
azure-ddos-protection-plan
The plan is a fixed monthly charge of roughly three thousand dollars from the moment it exists, attached VNets or not; it protects only the VNets that reference it; and DDoS IP Protection on the addresses themselves is an order of magnitude cheaper for a handful. The charge accepted by name before the plan is created, the plan ID exported for azure-vnet, an output that says it bills unattached.
azure-entra-domain-services
Microsoft Entra Domain Services with NTLM v1, TLS 1.0 and RC4 off and Kerberos armoring on, the WinRM network security group the service insists on, the AAD DC Administrators group with the members you name, and the Domain Controller Services principal registered, all of which fail late when missing. Notifications go to the admins; filtered sync and LDAPS are inputs.
azure-purview
A Microsoft Purview account for the data map with public network access off, the managed Event Hub that bills monthly whether used or not turned off, a system identity, and Storage Blob Data Reader granted to that identity on every storage account it will scan, since a scan fails otherwise. The account bills for data map capacity from creation; public access is accepted by name.
azure-waf-policy
Detection mode evaluates every rule, logs every match and forwards every request - the dashboard fills with blocked-looking entries while the backend receives them all. Prevention by default, Detection only by name. A policy attached to no listener protects nothing, so the attached listeners are an output; every exclusion is a hole and has to carry a reason.
azure-network-security-group
Every NSG carries default rules nobody wrote; a group with no subnet or NIC association is a rule set in the portal that filters nothing; and SSH and RDP from Internet are the first rules the portal offers. Your allows in priority order with an explicit DenyAllInbound at 4000, subnets associated by the module (none by name), 22 and 3389 from Internet refused unless accepted.