traefik/pkg/middlewares/ipwhitelist/ip_whitelist.go

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package ipwhitelist
import (
"context"
"errors"
"fmt"
"net/http"
"github.com/rs/zerolog/log"
"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/ip"
"github.com/traefik/traefik/v3/pkg/middlewares"
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"github.com/traefik/traefik/v3/pkg/middlewares/observability"
"go.opentelemetry.io/otel/trace"
)
const (
typeName = "IPWhiteLister"
)
// ipWhiteLister is a middleware that provides Checks of the Requesting IP against a set of Whitelists.
type ipWhiteLister struct {
next http.Handler
whiteLister *ip.Checker
strategy ip.Strategy
name string
}
// New builds a new IPWhiteLister given a list of CIDR-Strings to whitelist.
func New(ctx context.Context, next http.Handler, config dynamic.IPWhiteList, name string) (http.Handler, error) {
logger := middlewares.GetLogger(ctx, name, typeName)
logger.Debug().Msg("Creating middleware")
if len(config.SourceRange) == 0 {
return nil, errors.New("sourceRange is empty, IPWhiteLister not created")
}
checker, err := ip.NewChecker(config.SourceRange)
if err != nil {
return nil, fmt.Errorf("cannot parse CIDR whitelist %s: %w", config.SourceRange, err)
}
strategy, err := config.IPStrategy.Get()
if err != nil {
return nil, err
}
logger.Debug().Msgf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
return &ipWhiteLister{
strategy: strategy,
whiteLister: checker,
next: next,
name: name,
}, nil
}
func (wl *ipWhiteLister) GetTracingInformation() (string, string, trace.SpanKind) {
return wl.name, typeName, trace.SpanKindInternal
}
func (wl *ipWhiteLister) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
logger := middlewares.GetLogger(req.Context(), wl.name, typeName)
ctx := logger.WithContext(req.Context())
clientIP := wl.strategy.GetIP(req)
err := wl.whiteLister.IsAuthorized(clientIP)
if err != nil {
msg := fmt.Sprintf("Rejecting IP %s: %v", clientIP, err)
logger.Debug().Msg(msg)
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observability.SetStatusErrorf(req.Context(), msg)
reject(ctx, rw)
return
}
logger.Debug().Msgf("Accepting IP %s", clientIP)
wl.next.ServeHTTP(rw, req)
}
func reject(ctx context.Context, rw http.ResponseWriter) {
statusCode := http.StatusForbidden
rw.WriteHeader(statusCode)
_, err := rw.Write([]byte(http.StatusText(statusCode)))
if err != nil {
log.Ctx(ctx).Error().Err(err).Send()
}
}