77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
package middlewares
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import (
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"fmt"
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"net"
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"net/http"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/middlewares/tracing"
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"github.com/containous/traefik/whitelist"
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"github.com/pkg/errors"
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"github.com/urfave/negroni"
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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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handler negroni.Handler
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whiteLister *whitelist.IP
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}
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// NewIPWhitelister builds a new IPWhiteLister given a list of CIDR-Strings to whitelist
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func NewIPWhitelister(whitelistStrings []string) (*IPWhiteLister, error) {
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if len(whitelistStrings) == 0 {
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return nil, errors.New("no whitelists provided")
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}
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whiteLister := IPWhiteLister{}
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ip, err := whitelist.NewIP(whitelistStrings, false)
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if err != nil {
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return nil, fmt.Errorf("parsing CIDR whitelist %s: %v", whitelistStrings, err)
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}
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whiteLister.whiteLister = ip
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whiteLister.handler = negroni.HandlerFunc(whiteLister.handle)
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log.Debugf("configured %u IP whitelists: %s", len(whitelistStrings), whitelistStrings)
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return &whiteLister, nil
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}
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func (wl *IPWhiteLister) handle(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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ipAddress, _, err := net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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tracing.SetErrorAndWarnLog(r, "unable to parse remote-address from header: %s - rejecting", r.RemoteAddr)
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reject(w)
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return
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}
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allowed, ip, err := wl.whiteLister.Contains(ipAddress)
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if err != nil {
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tracing.SetErrorAndDebugLog(r, "source-IP %s matched none of the whitelists - rejecting", ipAddress)
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reject(w)
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return
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}
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if allowed {
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tracing.SetErrorAndDebugLog(r, "source-IP %s matched whitelist %s - passing", ipAddress, wl.whiteLister)
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next.ServeHTTP(w, r)
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return
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}
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tracing.SetErrorAndDebugLog(r, "source-IP %s matched none of the whitelists - rejecting", ip)
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reject(w)
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}
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func (wl *IPWhiteLister) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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wl.handler.ServeHTTP(rw, r, next)
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}
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func reject(w http.ResponseWriter) {
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statusCode := http.StatusForbidden
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w.WriteHeader(statusCode)
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w.Write([]byte(http.StatusText(statusCode)))
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}
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