Files
InvoiceShelf/config/pdf.php
csoscd f8cfb6cd33 fix: allow Gotenberg to reach private/Docker-internal hosts (#691)
* fix: allow Gotenberg to reach private/Docker-internal hosts (Issue #688)

The SSRF guard introduced in #664/#671 correctly blocks arbitrary
private URLs, but also prevents legitimate use-cases where Gotenberg
runs alongside InvoiceShelf in a Docker Compose network (e.g. the
default http://pdf:3000 service name resolves to a private IP).

Add a `gotenberg_allow_private_host` setting (env:
GOTENBERG_ALLOW_PRIVATE_HOST, default false) that:
- skips PrivateNetworkGuard in GotenbergPdfDriver
- skips PublicHttpUrl validation in PDFConfigurationRequest
- exposes a clearly-warned toggle in the admin PDF settings UI
- is persisted to the settings table and loaded via AppConfigProvider

A disabled guard is safe for controlled private networks (Docker
Compose, LAN); it must never be enabled for untrusted hosts. The UI
surfaces a prominent warning to communicate this constraint.

Closes #688

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* refactor(gotenberg): scope the private-host exemption to a declared host

Reshapes the escape hatch from a boolean admin setting into an
environment-declared host allowlist.

The driver streams the upstream response body back as the PDF, so a
mis-set Gotenberg host is full-response SSRF — pointed at a link-local
metadata endpoint it returns cloud credentials. A blanket "allow
private" switch left that reachable: gotenberg_host stays editable from
the admin UI, so any install that enabled the switch to run a sidecar
could have the host repointed at an internal service. The population the
flag existed to serve was exactly the population it failed to protect.

GOTENBERG_ALLOWED_PRIVATE_HOST now names the single host that may skip
the guard. Only that exact value is exempt; every other private target
stays blocked. GotenbergHostPolicy owns the comparison so the save-time
rule and the runtime driver guard cannot drift, and normalises case,
trailing slash and surrounding whitespace on both sides.

Being env-only also drops the settings-table key, the AppConfigProvider
branch and the whole admin UI surface — the toggle there could not be
switched on in any case, since BaseSwitchSection has no slot and was
passed no v-model, so the child BaseSwitch was discarded and the value
never changed from false.

Restores the gotenberg_margins validation rule, which the previous
revision replaced rather than added alongside.

Tests cover both directions, including that declaring one private host
does not exempt another; sabotaging the policy to always exempt fails 16
of the 22.

Co-authored-by: csoscd <csoscd@users.noreply.github.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Darko Gjorgjijoski <dg@darkog.com>
Co-authored-by: csoscd <csoscd@users.noreply.github.com>
2026-07-29 10:57:52 +02:00

47 lines
1.6 KiB
PHP

<?php
return [
/*
|--------------------------------------------------------------------------
| Default PDF Driver
|--------------------------------------------------------------------------
| Here you may specify which of the PDF drivers below you wish to use as
| your default driver for all PDF generation.
|
*/
'driver' => env('PDF_DRIVER', 'dompdf'),
/*
|--------------------------------------------------------------------------
| PDF Connections
|--------------------------------------------------------------------------
|
| Here are each of the connections setup for your application. Example
| configuration has been included, but you may add as many connections as
| you would like.
|
*/
'connections' => [
'dompdf' => [],
'gotenberg' => [
'host' => env('GOTENBERG_HOST', 'http://pdf:3000'),
'papersize' => env('GOTENBERG_PAPERSIZE', '210mm 297mm'),
/*
* Gotenberg usually runs as a sidecar on a private network, which the
* SSRF guard rejects. Name that one host here to exempt it — e.g.
* GOTENBERG_ALLOWED_PRIVATE_HOST=http://pdf:3000. Only this exact value
* is exempt; the guard still blocks every other private target, so the
* host setting cannot be repointed at an internal service. No default:
* the `host` fallback above must never be trusted implicitly.
*/
'allowed_private_host' => env('GOTENBERG_ALLOWED_PRIVATE_HOST'),
],
],
];