135 lines
4.7 KiB
Rust
135 lines
4.7 KiB
Rust
use libmcaptcha::{
|
|
cache::{messages::VerifyCaptchaResult, HashCache},
|
|
master::embedded::master::Master,
|
|
master::AddSiteBuilder,
|
|
pow::{ConfigBuilder, Work},
|
|
system::SystemBuilder,
|
|
DefenseBuilder, LevelBuilder, MCaptchaBuilder,
|
|
};
|
|
// traits from actix needs to be in scope for starting actor
|
|
use actix::prelude::*;
|
|
|
|
#[actix_rt::main]
|
|
async fn main() -> std::io::Result<()> {
|
|
// start cahce actor
|
|
// cache is used to store PoW requirements that are sent to clients
|
|
// This way, it can be verified that the client computed work over a config
|
|
// that _we_ sent. Offers protection against rainbow tables powered dictionary attacks
|
|
let cache = HashCache::default().start();
|
|
|
|
// create PoW config with unique salt. Salt has to be safely guarded.
|
|
// salts protect us from replay attacks
|
|
let pow = ConfigBuilder::default()
|
|
.salt("myrandomsaltisnotlongenoug".into())
|
|
.build()
|
|
.unwrap();
|
|
|
|
// start master actor. Master actor is responsible for managing MCaptcha actors
|
|
// each mCaptcha system should have only one master
|
|
let master = Master::new(60).start();
|
|
|
|
// Create system. System encapsulates master and cache and provides useful abstraction
|
|
// each mCaptcha system should have only one system
|
|
let system = SystemBuilder::default()
|
|
.master(master)
|
|
.cache(cache)
|
|
.pow(pow.clone())
|
|
.build()
|
|
.unwrap();
|
|
|
|
// configure defense. This is a per site configuration. A site can have several levels
|
|
// of defenses configured
|
|
let defense = DefenseBuilder::default()
|
|
// add as many defense as you see fit
|
|
.add_level(
|
|
LevelBuilder::default()
|
|
// visitor_threshold is the threshold/limit at which
|
|
// mCaptcha will adjust difficulty defense
|
|
// it is advisable to set small values for the first
|
|
// defense visitor_threshold and difficulty_factor
|
|
// as this will be the work that clients will be
|
|
// computing when there's no load
|
|
.visitor_threshold(50)
|
|
.difficulty_factor(500)
|
|
.unwrap()
|
|
.build()
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
.add_level(
|
|
LevelBuilder::default()
|
|
.visitor_threshold(5000)
|
|
.difficulty_factor(50000)
|
|
.unwrap()
|
|
.build()
|
|
.unwrap(),
|
|
)
|
|
.unwrap()
|
|
.build()
|
|
.unwrap();
|
|
|
|
// create and start MCaptcha actor that uses the above defense configuration
|
|
// This is what manages the difficulty factor of sites that an mCaptcha protects
|
|
let mcaptcha = MCaptchaBuilder::default()
|
|
.defense(defense)
|
|
// leaky bucket algorithm's emission interval
|
|
.duration(30)
|
|
// .cache(cache)
|
|
.build()
|
|
.unwrap();
|
|
|
|
// unique value identifying an MCaptcha actor
|
|
let mcaptcha_name = "batsense.net";
|
|
|
|
// add MCaptcha to Master
|
|
let msg = AddSiteBuilder::default()
|
|
.id(mcaptcha_name.into())
|
|
.mcaptcha(mcaptcha)
|
|
.build()
|
|
.unwrap();
|
|
system.master.send(msg).await.unwrap();
|
|
|
|
// Get PoW config. Should be called everytime there's a visitor for a
|
|
// managed site(here mcaptcha_name)
|
|
let work_req = system.get_pow(mcaptcha_name.into()).await.unwrap();
|
|
|
|
// the following computation should be done on the client but for the purpose
|
|
// of this illustration, we are going to do it on the server it self
|
|
let work = pow
|
|
.prove_work(&work_req.string, work_req.difficulty_factor)
|
|
.unwrap();
|
|
|
|
// the payload that the client sends to the server
|
|
let payload = Work {
|
|
string: work_req.string,
|
|
result: work.result,
|
|
nonce: work.nonce,
|
|
key: mcaptcha_name.into(),
|
|
};
|
|
|
|
// mCAptcha evaluates client's work. Returns a token if everything
|
|
// checksout and Err() if something fishy is happening
|
|
let res = system.verify_pow(payload.clone()).await;
|
|
assert!(res.is_ok());
|
|
|
|
// The client should submit the token to the mCaptcha protected service
|
|
// The service should validate the token received from the client
|
|
// with the mCaptcha server before processing client's
|
|
// request
|
|
|
|
// mcaptcha protected service sends the following paylaod to mCaptcha
|
|
// server:
|
|
let verify_msg = VerifyCaptchaResult {
|
|
token: res.unwrap(),
|
|
key: mcaptcha_name.into(),
|
|
};
|
|
|
|
// on mCaptcha server:
|
|
let res = system.validate_verification_tokens(verify_msg).await;
|
|
// mCaptcha will return true if token is valid and false if
|
|
// token is invalid
|
|
assert!(res.is_ok());
|
|
assert!(res.unwrap());
|
|
|
|
Ok(())
|
|
}
|