85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
package ipwhitelist
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
|
|
"github.com/containous/traefik/pkg/config/dynamic"
|
|
"github.com/containous/traefik/pkg/ip"
|
|
"github.com/containous/traefik/pkg/middlewares"
|
|
"github.com/containous/traefik/pkg/tracing"
|
|
"github.com/opentracing/opentracing-go/ext"
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
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("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: %v", config.SourceRange, err)
|
|
}
|
|
|
|
strategy, err := config.IPStrategy.Get()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
logger.Debugf("Setting up IPWhiteLister with sourceRange: %s", config.SourceRange)
|
|
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) {
|
|
logger := middlewares.GetLogger(req.Context(), wl.name, typeName)
|
|
|
|
err := wl.whiteLister.IsAuthorized(wl.strategy.GetIP(req))
|
|
if err != nil {
|
|
logMessage := fmt.Sprintf("rejecting request %+v: %v", req, err)
|
|
logger.Debug(logMessage)
|
|
tracing.SetErrorWithEvent(req, logMessage)
|
|
reject(logger, rw)
|
|
return
|
|
}
|
|
logger.Debugf("Accept %s: %+v", wl.strategy.GetIP(req), req)
|
|
|
|
wl.next.ServeHTTP(rw, req)
|
|
}
|
|
|
|
func reject(logger logrus.FieldLogger, rw http.ResponseWriter) {
|
|
statusCode := http.StatusForbidden
|
|
|
|
rw.WriteHeader(statusCode)
|
|
_, err := rw.Write([]byte(http.StatusText(statusCode)))
|
|
if err != nil {
|
|
logger.Error(err)
|
|
}
|
|
}
|