traefik/middlewares/ip_whitelister.go

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