Add TLS certs support for mutual authentication

[zhiburt]

Hi there

Thanks for the good first issue label

Let me know if I did something wrong (which I could 😞).

closes #82

[codecov]

Codecov Report

Merging #83 (8f37147) into master (eddadbb) will increase coverage by 1.62%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   82.18%   83.81%   +1.62%     
==========================================
  Files          18       18              
  Lines        1600     1637      +37     
==========================================
+ Hits         1315     1372      +57     
+ Misses        241      213      -28     
- Partials       44       52       +8     

Impacted Files	Coverage Δ
core/types/scenario.go	84.00% <43.75%> (-10.92%)	⬇️
config/json.go	74.43% <75.00%> (-0.27%)	⬇️
main.go	55.30% <78.94%> (-0.77%)	⬇️
core/scenario/requester/http.go	82.99% <100.00%> (+9.47%)	⬆️

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[kursataktas]

Thank you for this fantastic work 🎊 🚀

I left a few comments. Please take a look at them.

Also, you may consider adding some test cases on json_test.go and main_test.go

[zhiburt]

Also, you may consider adding some test cases on json_test.go and main_test.go

done

[kursataktas]

TODO: Readme update

[kursataktas]

Everything looks clear @zhiburt 🚀

There are 2 things left before merging this branch:

1. Could you please update the related section of the Readme
2. Could you please update the description of this PR with the explanation of your manual test steps? It would be useful for future bug investigations.

[zhiburt]

Could you please update the related section of the Readme

Added

Could you please update the description of this PR with the explanation of your manual test steps? It would be useful for future bug investigations.

I don't have any manual steps :)
I've added an descriptions for the tests in engine_test.go.

To test it manually you would need to spawn a webserver with chosen certs and direct ddosify to the webserver.

[zhiburt]

I've played a little bit and it works. (Took me a while...)
Based on https://medium.com/@sevcsik/authentication-using-https-client-certificates-3c9d270e8326

1. Generate certificates following the guide.
2. Run this server node your_file.js

const https = require('https')
const fs = require('fs');

let server = https.createServer({
    requestCert: true,
    rejectUnauthorized: false,
    key: fs.readFileSync('server_key.pem'),
    cert: fs.readFileSync('server_cert.pem'),
    ca: [ fs.readFileSync('server_cert.pem') ]
},
(req, res)  => {
    const cert = req.connection.getPeerCertificate()
    if (cert != null && cert.subject != null) {
        console.info(`Hello ${cert.subject.CN}, your certificate was issued by ${cert.issuer.CN}!`)
    }

    if (!req.client.authorized) {
        res.writeHead(401);
        return res.end('Invalid client certificate authentication.');
      }

      console.info("123213321");

      res.writeHead(200);
      res.end('Hello, world!');
});

server.listen(8098)

3. Run ddosify without certs

go run main.go -t https://127.0.0.1:8098

4. Run ddosify with alice certs

go run main.go -t https://127.0.0.1:8098 --cert_path=/alice_cert.pem --cert_key_path=/alice_key.pem

[kursataktas]

Fascinating work @zhiburt 🎊 Thank you very much for your effort. I'll merge the PR this week.