88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
package ipwhitelist
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"github.com/opentracing/opentracing-go/ext"
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"github.com/traefik/traefik/v2/pkg/config/dynamic"
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"github.com/traefik/traefik/v2/pkg/ip"
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"github.com/traefik/traefik/v2/pkg/log"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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"github.com/traefik/traefik/v2/pkg/tracing"
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)
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const (
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typeName = "IPWhiteLister"
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)
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// ipWhiteLister is a middleware that provides Checks of the Requesting IP against a set of Whitelists.
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type ipWhiteLister struct {
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next http.Handler
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whiteLister *ip.Checker
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strategy ip.Strategy
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name string
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}
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// New builds a new IPWhiteLister given a list of CIDR-Strings to whitelist.
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func New(ctx context.Context, next http.Handler, config dynamic.IPWhiteList, name string) (http.Handler, error) {
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logger := log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName))
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logger.Debug("Creating middleware")
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if len(config.SourceRange) == 0 {
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return nil, errors.New("sourceRange is empty, IPWhiteLister not created")
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}
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checker, err := ip.NewChecker(config.SourceRange)
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if err != nil {
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return nil, fmt.Errorf("cannot parse CIDR whitelist %s: %w", config.SourceRange, err)
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}
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strategy, err := config.IPStrategy.Get()
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if err != nil {
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return nil, err
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}
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logger.Debugf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
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return &ipWhiteLister{
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strategy: strategy,
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whiteLister: checker,
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next: next,
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name: name,
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}, nil
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}
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func (wl *ipWhiteLister) GetTracingInformation() (string, ext.SpanKindEnum) {
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return wl.name, tracing.SpanKindNoneEnum
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}
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func (wl *ipWhiteLister) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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ctx := middlewares.GetLoggerCtx(req.Context(), wl.name, typeName)
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logger := log.FromContext(ctx)
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clientIP := wl.strategy.GetIP(req)
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err := wl.whiteLister.IsAuthorized(clientIP)
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if err != nil {
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msg := fmt.Sprintf("Rejecting IP %s: %v", clientIP, err)
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logger.Debug(msg)
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tracing.SetErrorWithEvent(req, msg)
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reject(ctx, rw)
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return
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}
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logger.Debugf("Accepting IP %s", clientIP)
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wl.next.ServeHTTP(rw, req)
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}
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func reject(ctx context.Context, rw http.ResponseWriter) {
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statusCode := http.StatusForbidden
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rw.WriteHeader(statusCode)
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_, err := rw.Write([]byte(http.StatusText(statusCode)))
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if err != nil {
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log.FromContext(ctx).Error(err)
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}
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}
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