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Informations about the package magesuite-vary-cookie-signer

Motivation

Magento uses special cookie called X-Magento-Vary to distinguish between different variants of some pages (eg. PDP page for customers with special discount).

When varnish server is used this is handled by adding content of X-Magento-Vary cookie to hash key.

This can be abused to bypass varnish page cache and generate high load on php server by generating random value for every request.

This extension provide a way to verify valid cookie on varnish server by providing extra cookie called X-Magento-Vary-Sign containing sha1 hash of X-Magento-Vary cookie content and signing key (which should be random value). Without knowing secret, attacker isn't able to generate correctly signed cookie and we can verify it on varnish server and ignore incorrect values, therefore reuse cached page.

Magento configuration

Edit the /app/etc/env.php file to configure the signing key.

Varnish configuration

You need to install uplex vmod_blobdigest also available as RPM in mageops repository.

Make sure you have those imports at the beginning of your VCL:

Add to sub vcl_init

Add to sub vcl_recv

NOTE: First if statement can only fail when update is called after finish, but this is not possible, however VCL do not allow calling object methods, therefore this function mainly as workaround to this limitation.

Do not forget to replace REPLACE_THIS_WITH_SIGNING_KEY with your unique random string, and make sure you use the same value in varnish and magento.

https://creativestyle.atlassian.net/wiki/spaces/MGSDEV/pages/2359951361/VaryCookieSigner+optional

All versions of magesuite-vary-cookie-signer with dependencies

PHP Build Version
Package Version
Requires magento/framework Version >=103.0.5 <130.0.5-p5
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