traefik/pkg/middlewares/ipwhitelist/ip_whitelist.go

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package ipwhitelist
import (
"context"
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"errors"
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"fmt"
"net/http"
"github.com/opentracing/opentracing-go/ext"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/ip"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares"
"github.com/traefik/traefik/v2/pkg/tracing"
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)
const (
typeName = "IPWhiteLister"
)
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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 {
next http.Handler
whiteLister *ip.Checker
strategy ip.Strategy
name string
}
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// 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) {
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logger := log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName))
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logger.Debug("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 {
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return nil, fmt.Errorf("cannot parse CIDR whitelist %s: %w", config.SourceRange, err)
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}
strategy, err := config.IPStrategy.Get()
if err != nil {
return nil, err
}
logger.Debugf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
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return &ipWhiteLister{
strategy: strategy,
whiteLister: checker,
next: next,
name: name,
}, nil
}
func (wl *ipWhiteLister) GetTracingInformation() (string, ext.SpanKindEnum) {
return wl.name, tracing.SpanKindNoneEnum
}
func (wl *ipWhiteLister) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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ctx := middlewares.GetLoggerCtx(req.Context(), wl.name, typeName)
logger := log.FromContext(ctx)
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clientIP := wl.strategy.GetIP(req)
err := wl.whiteLister.IsAuthorized(clientIP)
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if err != nil {
msg := fmt.Sprintf("Rejecting IP %s: %v", clientIP, err)
logger.Debug(msg)
tracing.SetErrorWithEvent(req, msg)
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reject(ctx, rw)
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return
}
logger.Debugf("Accepting IP %s", clientIP)
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wl.next.ServeHTTP(rw, req)
}
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func reject(ctx context.Context, rw http.ResponseWriter) {
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statusCode := http.StatusForbidden
rw.WriteHeader(statusCode)
_, err := rw.Write([]byte(http.StatusText(statusCode)))
if err != nil {
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log.FromContext(ctx).Error(err)
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}
}