WAF: Add DropRequest helper to block request in hooks

[blotus]

Allow to manually block requests from a pre_eval hook.

This allows for example to easily implement geoblocking by reusing existing crowdsec helpers:

 - filter: IsInBand == true && GeoIPEnrich(req.RemoteAddr)?.Country.IsoCode not in ["FR", "US"]
   apply:
     - SetReturnCode(400)
     - DropRequest("Forbidden Country")

[github-actions]

@blotus: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[blotus]

/kind feature
/area appsec

[codecov]

Codecov Report

❌ Patch coverage is 76.84887% with 72 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.89%. Comparing base (2398e7b) to head (9ce70b5).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/acquisition/modules/appsec/utils.go	78.45%	29 Missing and 10 partials ⚠️
pkg/acquisition/modules/appsec/appsec_runner.go	68.18%	12 Missing and 9 partials ⚠️
pkg/appsec/appsec.go	80.00%	7 Missing and 3 partials ⚠️
pkg/appsec/tx.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4016      +/-   ##
==========================================
+ Coverage   62.76%   62.89%   +0.13%     
==========================================
  Files         459      459              
  Lines       33067    33254     +187     
==========================================
+ Hits        20753    20914     +161     
- Misses      10195    10211      +16     
- Partials     2119     2129      +10     

Flag	Coverage Δ
bats	46.28% <41.47%> (-0.10%)	⬇️
unit-linux	35.74% <74.91%> (+0.27%)	⬆️
unit-windows	25.00% <58.19%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.