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Document tls_no_verify #394

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27 changes: 20 additions & 7 deletions src/content/docs/aws/capabilities/security-testing/custom-tls-certificates.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,9 @@
title: Custom TLS certificates
description: Using custom TLS certificates with LocalStack
template: doc
tags: ["Free"]
tags: ['Free']
sidebar:
order: 5
order: 5
---

import { Tabs, TabItem } from '@astrojs/starlight/components';
Expand Down Expand Up @@ -88,8 +88,8 @@ services:
It is recommended to create a `boot` init hook.
Create a directory on your local system that includes

* the certificate you wish to copy, and
* the following shell script:
- the certificate you wish to copy, and
- the following shell script:

```bash
#!/bin/bash
Expand All @@ -102,8 +102,21 @@ update-ca-certificates

Then run LocalStack with the environment variables

* `REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt`, and
* `CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt`, and
* `NODE_EXTRA_CA_CERTS=/etc/ssl/certs/ca-certificates.crt`
- `REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt`, and
- `CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt`, and
- `NODE_EXTRA_CA_CERTS=/etc/ssl/certs/ca-certificates.crt`

and follow the instructions fn the [init hooks documentation](/aws/capabilities/config/initialization-hooks) for configuring LocalStack to use the hook directory as a `boot` hook.

## Disabling TLS verification for LocalStack Cloud

If your proxy intercepts traffic to LocalStack cloud services (e.g., license server, localhost.localstack.cloud), you can disable TLS verification for these specific requests using the `SSL_NO_VERIFY` [configuration variable](/aws/capabilities/config/configuration#security).
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@simonrw simonrw Jan 30, 2026

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nit: localhost.localstack.cloud is not one of our cloud services. The two requests we make are to the license server, and to fetch our TLS certificate so that we can serve a trusted certificate for localhost.localstack.cloud.


```bash
SSL_NO_VERIFY=1 localstack start
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@simonrw simonrw Jan 30, 2026

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question: don't we have a thing where our envars need to be prefixed with LOCALSTACK_?

```

:::caution
This approach disables certificate verification rather than trusting your proxy's certificate.
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@simonrw simonrw Jan 30, 2026

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praise: good worth putting in here that disabling TLS verification should be a last resort 👍

Use custom certificates (as described above) when you need to maintain proper TLS verification for all traffic.
:::