Files
FreshRSS/app/Utils/httpUtil.php
Inverle dcec27c69d Add SSRF mitigations using filter_var and CURLOPT_RESOLVE (#8400)
* Add SSRF mitigations using `filter_var` and `CURLOPT_RESOLVE`
The idea is to prevent FreshRSS from sending any HTTP requests to internal services, except for the ones that are explicitly allowed in the config.

Based on 6e82b46a48/lib/filelib.php (L3818) and https://github.com/symfony/symfony/blob/8.1/src/Symfony/Component/HttpClient/NoPrivateNetworkHttpClient.php

https://github.com/FreshRSS/simplepie/pull/76
https://github.com/FreshRSS/simplepie/pull/78

* Add allowlist setting in Web UI

* make readme

* Update app/i18n/fr/admin.php

Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

* make readme again

* make readme

* Further work

Still WIP and needs testing etc.

* Readd previous if check for domain combination allowlist

* Turn POST to GET after redirect

* Improve

* Update config.default.php

Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

* make readme

* Skip SSRF check if `CURLOPT_PROXY` is set

* make readme

* Fix `!empty()` mistake

* Respect max redirects feed option when fetching with `httpGet()`

* Respect max redirects during SimplePie fetching + fix bypass

bypass fix: `CURLOPT_FOLLOWLOCATION` was moved below so that emulated redirects are enforced.

* Avoid FreshRSS and Minz code in SimplePie
https://github.com/FreshRSS/FreshRSS/pull/8400#discussion_r2935375980

* Corrected hook code

* phpdoc wrong return type

* Add CIDR support in allowlist

* Implement simple DNS caching

* Suppress `dns_get_record()` warnings

* A bit of proof-reading

* Minor typo

* Fix proxy logic

* Fix HTTP POST redirect logic

* Proofread checkCIDR
Add fixes for several situations

* Remove credentials from URL in logs

* Ensure `CURLOPT_FOLLOWLOCATION` is `false` by setting it at the end

* Fix codesniffer long line

* Fix potential bypass due to wrong return value

If there were no records returned by `dns_get_record()`, no overrides to `CURLOPT_RESOLVE` would get passed,
and a potential bypass could occur, when cURL would try to resolve the domain by itself.

* Put the URL at the end in logs

* Add documentation and environment variable support

* make readme

* Fix wrong behavior in case of IP

* Fix duplicate selector in CSS

* Minor type check change

* i18n fr, en

* Minor type check change

* Fix whitespace i18n fr

* make fix-all

* Fix `$ips_ok` not being returned after domain records were cached

* make readme

* PHPStan fix

* make readme

* Minor syntax in SimplePie

* Only return `null` if no allowed IPs were found

* Add wildcard *, help message

* Consistent docs with help message

* i18n: pl

* SimplePie compatibility PHP 7.2

* make fix-all

* Sync SimplePie
* https://github.com/FreshRSS/simplepie/pull/76

* 💥 Breaking change in the Changelog

* Document `INTERNAL_HOST_ALLOWLIST` in Docker docs

* Remove `Cookie` and `Authorization` headers in `httpGet()` during cross-origin redirect

* Minor whitespace
And same comment convention than below

* Remove authentication headers and change POST to GET on redirect in SimplePie

* Remove .local in Docker example

* Fill in default ports when comparing URL origins

* Remove .local from other places than the Docker example

* Rewrite WebSub subscribe to use `httpGet()`

* make fix-all

* Also unset `CURLOPT_USERPWD` during redirects

* phpcs fix

* Always unset `CURLOPT_FOLLOWLOCATION`

* Bump SimplePie
https://github.com/FreshRSS/simplepie/pull/78

* Update logic for CURLOPT_FOLLOWLOCATION

* Fix PHPStan

* Changelog fix security section

* Update most common RSS Bridge case
https://hub.docker.com/r/rssbridge/rss-bridge

* Replace misleading 127.0.0.1:8080 example for Docker
This does not make sense for a Docker container

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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>
2026-06-28 18:51:04 +02:00

28 KiB