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Merge pull request #57 from hslatman/appsec
Add `AppSec` integration
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| // Copyright 2024 Herman Slatman | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package appsec | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "net/http" | ||
| "net/netip" | ||
|
|
||
| "github.com/caddyserver/caddy/v2" | ||
| "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" | ||
| "github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile" | ||
| "github.com/caddyserver/caddy/v2/modules/caddyhttp" | ||
| "go.uber.org/zap" | ||
|
|
||
| "github.com/hslatman/caddy-crowdsec-bouncer/crowdsec" | ||
| "github.com/hslatman/caddy-crowdsec-bouncer/internal/bouncer" | ||
| "github.com/hslatman/caddy-crowdsec-bouncer/internal/httputils" | ||
| ) | ||
|
|
||
| func init() { | ||
| caddy.RegisterModule(Handler{}) | ||
| httpcaddyfile.RegisterHandlerDirective("appsec", parseCaddyfileHandlerDirective) | ||
| } | ||
|
|
||
| // Handler checks the CrowdSec AppSec component decided whether | ||
| // an HTTP request is blocked or not. | ||
| type Handler struct { | ||
| logger *zap.Logger | ||
| crowdsec *crowdsec.CrowdSec | ||
| } | ||
|
|
||
| // CaddyModule returns the Caddy module information. | ||
| func (Handler) CaddyModule() caddy.ModuleInfo { | ||
| return caddy.ModuleInfo{ | ||
| ID: "http.handlers.appsec", | ||
| New: func() caddy.Module { return new(Handler) }, | ||
| } | ||
| } | ||
|
|
||
| // Provision sets up the CrowdSec AppSec handler. | ||
| func (h *Handler) Provision(ctx caddy.Context) error { | ||
| crowdsecAppIface, err := ctx.App("crowdsec") | ||
| if err != nil { | ||
| return fmt.Errorf("getting crowdsec app: %v", err) | ||
| } | ||
| h.crowdsec = crowdsecAppIface.(*crowdsec.CrowdSec) | ||
|
|
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| h.logger = ctx.Logger(h) | ||
|
|
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| return nil | ||
| } | ||
|
|
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| // Validate ensures the app's configuration is valid. | ||
| func (h *Handler) Validate() error { | ||
| if h.crowdsec == nil { | ||
| return errors.New("crowdsec app not available") | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
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| // Cleanup cleans up resources when the module is being stopped. | ||
| func (h *Handler) Cleanup() error { | ||
| h.logger.Sync() // nolint | ||
|
|
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| return nil | ||
| } | ||
|
|
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| // ServeHTTP is the Caddy handler for serving HTTP requests. | ||
| func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error { | ||
| var ( | ||
| ctx = r.Context() | ||
| ip netip.Addr | ||
| ) | ||
|
|
||
| ctx, ip = httputils.EnsureIP(ctx) | ||
| if err := h.crowdsec.CheckRequest(ctx, r); err != nil { | ||
| a := &bouncer.AppSecError{} | ||
| if !errors.As(err, &a) { | ||
| return err | ||
| } | ||
|
|
||
| switch a.Action { | ||
| case "allow": | ||
| // nothing to do | ||
| case "log": | ||
| h.logger.Info("appsec rule triggered", zap.String("ip", ip.String()), zap.String("action", a.Action)) | ||
| default: | ||
| return httputils.WriteResponse(w, h.logger, a.Action, ip.String(), a.Duration, a.StatusCode) | ||
| } | ||
| } | ||
|
|
||
| // Continue down the handler stack | ||
| if err := next.ServeHTTP(w, r.WithContext(ctx)); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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| // UnmarshalCaddyfile implements caddyfile.Unmarshaler. | ||
| func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error { | ||
| return nil | ||
| } | ||
|
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| // parseCaddyfileHandlerDirective parses the `crowdsec` Caddyfile directive | ||
| func parseCaddyfileHandlerDirective(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) { | ||
| var handler Handler | ||
| err := handler.UnmarshalCaddyfile(h.Dispenser) | ||
| return &handler, err | ||
| } | ||
|
|
||
| // Interface guards | ||
| var ( | ||
| _ caddy.Module = (*Handler)(nil) | ||
| _ caddy.Provisioner = (*Handler)(nil) | ||
| _ caddy.Validator = (*Handler)(nil) | ||
| _ caddyhttp.MiddlewareHandler = (*Handler)(nil) | ||
| _ caddyfile.Unmarshaler = (*Handler)(nil) | ||
| ) |
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