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f5d580578c
The sequence diagrams used the keyword `Destroy` (capital D). Mermaid keywords are case-sensitive, so the invalid token aborted parsing and every diagram failed to render on GitHub. Lowercase all `Destroy` -> `destroy` in README.md and the captcha example README. The `create` keyword was already correct, and each create/destroy is properly paired with an adjacent message. Fixes #270 Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
162 lines
5.1 KiB
Markdown
162 lines
5.1 KiB
Markdown
# Example
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## Enabling catpcha response from crowdsec
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Crowdsec support 3 remediations solutions `ban`, `captcha`, and `throttle`.
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This plugins support the `ban` and `captcha` remediation.
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### Traefik configuration
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The minimal configuration is defined below.
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For now 3 captcha providers are supported:
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- [hcaptcha](https://www.hcaptcha.com/)
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- [recaptcha](https://www.google.com/recaptcha/about/)
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- [turnstile](https://www.cloudflare.com/fr-fr/products/turnstile/)
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```yaml
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labels:
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# Choose captcha provider
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- "traefik.http.middlewares.crowdsec.plugin.bouncer.captchaProvider=hcaptcha"
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# Define captcha site key
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- "traefik.http.middlewares.crowdsec.plugin.bouncer.captchaSiteKey=FIXME"
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# Define captcha secret key
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- "traefik.http.middlewares.crowdsec.plugin.bouncer.captchaSecretKey=FIXME"
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# Define captcha grace period seconds
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- "traefik.http.middlewares.crowdsec.plugin.bouncer.captchaGracePeriodSeconds=1800"
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# Define captcha HTML file path
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- "traefik.http.middlewares.crowdsec.plugin.bouncer.captchaHTMLFilePath=/captcha.html"
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```
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The captcha HTML file must be present in the Traefik container (bind mounted or added during a custom build).
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It is not directly accessible from Traefik even when importing the plugin, so [download](https://raw.githubusercontent.com/maxlerebourg/crowdsec-bouncer-traefik-plugin/master/captcha.html) it locally to expose it to Traefik.
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```yaml
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...
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traefik:
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image: "traefik:v3.0.0"
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volumes:
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- './captcha.html:/captcha.html'
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...
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```
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### Crowdsec configuration
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Crowdsec by default will take the ban action on suspicious activity detected in logs.
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To instruct Crowdsec to use captcha remediation, change the `/etc/crowdsec/profiles.yaml`.
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2 modes are supported:
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- Always return a captcha decision
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- Return a captcha decision the first X times and then a ban decision.
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The second mode could be used to prevent repeated malicious activity.
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More information is available on configuring Crowdsec in the [official documentation](https://docs.crowdsec.net/docs/next/local_api/profiles/captcha_profile/).
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```yaml
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...
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crowdsec:
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image: crowdsecurity/crowdsec:v1.6.1-2
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volumes:
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# For captcha and ban mixed decision
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- './profiles.yaml:/etc/crowdsec/profiles.yaml:ro'
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# For captcha only remediation
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# - './profiles_captcha_only.yaml:/etc/crowdsec/profiles.yaml:ro'
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...
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```
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## Exemple navigation
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We can try to query normally the whoami server:
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```bash
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curl http://localhost:8000/foo
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```
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We can try to ban ourself
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```bash
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docker exec crowdsec cscli decisions add --ip 10.0.0.20 -d 4h --type captcha
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```
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We will see in the browser the captcha validation page:
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To play the demo environment run:
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```bash
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make run_captcha
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```
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> Note, if we are banned with a "ban" decision from crowdsec a captcha will not be asked and you will have to wait for the decision to expire or remove it manually.
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```bash
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docker exec crowdsec cscli decisions add --ip 10.0.0.10 -d 10m --type ban
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```
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## Captcha Workflow
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> Context: The user has no decision attached to his IP
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```mermaid
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sequenceDiagram
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participant User
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participant TraefikPlugin
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User->>TraefikPlugin: Can I access that webpage
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create participant PluginCache
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TraefikPlugin-->>PluginCache: Does the user IP has a crowdsec decision ?
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destroy PluginCache
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PluginCache-->>TraefikPlugin: Nothing, all good!
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destroy TraefikPlugin
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TraefikPlugin->>Webserver: Forwarding this HTTP Request from User
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Webserver->>User: HTTP Response
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```
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> Context: The user has a captcha decision attached to his IP
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```mermaid
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sequenceDiagram
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participant User
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participant TraefikPlugin
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User->>TraefikPlugin: Can I access that webpage
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create participant PluginCache
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TraefikPlugin-->>PluginCache: Does the User IP has a Crowdsec Decision ?
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PluginCache-->>TraefikPlugin: Yes a Catpcha Decision
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TraefikPlugin->>User: Please complete this captcha
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User->>TraefikPlugin: Fine, done!
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create participant ProviderCaptcha
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TraefikPlugin-->>ProviderCaptcha: Is the validation OK ?
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destroy ProviderCaptcha
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ProviderCaptcha-->>TraefikPlugin: Yes
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TraefikPlugin-->>PluginCache: Set the User IP Clean for captchaGracePeriodSeconds
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destroy PluginCache
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PluginCache-->>TraefikPlugin: Done
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destroy TraefikPlugin
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TraefikPlugin->>Webserver: Forwarding this HTTP Request from User
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Webserver->>User: HTTP Response
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```
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> Context: The user has a ban decision attached to his IP
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```mermaid
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sequenceDiagram
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participant User
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participant TraefikPlugin
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User->>TraefikPlugin: Can I access that webpage
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create participant PluginCache
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TraefikPlugin-->>PluginCache: Does the User IP has a Crowdsec Decision ?
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destroy PluginCache
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PluginCache-->>TraefikPlugin: Yes a ban Decision
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TraefikPlugin->>User: No, HTTP 403
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```
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## Captcha Configuration:
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- Recaptcha
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Choose v2 (challenge) and configure the domain to protect:
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- Turnstile
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TODO
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- Hcatpcha
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TODO
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