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Imagine the following scenario:

  1. Host A serves via HTTP hello_world.jpg, which has been AES-encrypted.

  2. Host B, which acts as a proxy being aware of Host A's resources, responds to a HTTP call by fetching and decrypting hello_world.jpg.

Is there any easy way to do this with an existing proxy?

Oriol del Rio
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Many proxy servers can call an external helper program to process and modify any content that is requested using the proxy. Others will also/instead support custom lua scripts to perform request modifications.

Squid for instance has the url_rewrite_program directive. See this implementation for example: https://www.funkypenguin.co.nz/how-to/april-fools-pranks-with-a-squid-proxy-server/

LUA support in:

HBruijn
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  • Thanks @HBrujin. In addition to what you are pointing to, I stumbled upon this library and example that might do the trick: https://github.com/c64bob/lua-resty-aes – Oriol del Rio May 29 '19 at 20:01