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local.go (1034B)

      1 package config
      2 
      3 import (
      4 	"fmt"
      5 	"net"
      6 	"net/url"
      7 )
      8 
      9 var lookupHostFn = net.LookupHost
     10 
     11 func isLoopbackHost(host string) (bool, error) {
     12 	ip := net.ParseIP(host)
     13 	if ip != nil {
     14 		return ip.IsLoopback(), nil
     15 	}
     16 
     17 	// Host is not an ip, perform lookup
     18 	addrs, err := lookupHostFn(host)
     19 	if err != nil {
     20 		return false, err
     21 	}
     22 	if len(addrs) == 0 {
     23 		return false, fmt.Errorf("no addrs found for host, %s", host)
     24 	}
     25 
     26 	for _, addr := range addrs {
     27 		if !net.ParseIP(addr).IsLoopback() {
     28 			return false, nil
     29 		}
     30 	}
     31 
     32 	return true, nil
     33 }
     34 
     35 func validateLocalURL(v string) error {
     36 	u, err := url.Parse(v)
     37 	if err != nil {
     38 		return err
     39 	}
     40 
     41 	host := u.Hostname()
     42 	if len(host) == 0 {
     43 		return fmt.Errorf("unable to parse host from local HTTP cred provider URL")
     44 	} else if isLoopback, err := isLoopbackHost(host); err != nil {
     45 		return fmt.Errorf("failed to resolve host %q, %v", host, err)
     46 	} else if !isLoopback {
     47 		return fmt.Errorf("invalid endpoint host, %q, only host resolving to loopback addresses are allowed", host)
     48 	}
     49 
     50 	return nil
     51 }