[Feature] [Prototype] Adding internal scripting engine

[Mzack9999]

Adding supports for OOB-yaml based templates:

• DSL matcher on requests
• Invoke a custom callback in python-like language
• Allows to manipulate responses (currently only HTTP and partially DNS)

Not compiling as nebula is still incomplete

[Mzack9999]

Steps to reproduce locally:

• Run interactsh-server

$ go run . -template -unsafe -debug -skip-acme
2021/09/13 13:26:40 Client Token: <Token>
2021/09/13 13:26:40 Listening on DNS, SMTP and HTTP ports

• run interactsh-client:

$ go run . -url http://localhost -v -template-path templates/callbacks_http.yaml -token <token>

    _       __                       __       __  
   (_)___  / /____  _________ ______/ /______/ /_ 
  / / __ \/ __/ _ \/ ___/ __ '/ ___/ __/ ___/ __ \
 / / / / / /_/  __/ /  / /_/ / /__/ /_(__  ) / / /
/_/_/ /_/\__/\___/_/   \__,_/\___/\__/____/_/ /_/ v0.0.5

                projectdiscovery.io

[INF] Listing 1 URL for OOB Testing
[INF] <id>.localhost

• Issue the following request with the path /test1 to trigger the customized response

GET /test1 HTTP/1.1
Host: <id>.localhost
Content-Length: 2

Response:

HTTP/1.1 500 Internal Server Error
Another_one: this is another header
Authorization: kasdkasjd
Date: Mon, 13 Sep 2021 11:22:43 GMT
Content-Length: 4
Content-Type: text/plain; charset=utf-8

test

[ehsandeep]

Closing as not planned.