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|
package config
import (
"fmt"
"net"
"net/url"
)
var lookupHostFn = net.LookupHost
func isLoopbackHost(host string) (bool, error) {
ip := net.ParseIP(host)
if ip != nil {
return ip.IsLoopback(), nil
}
// Host is not an ip, perform lookup
addrs, err := lookupHostFn(host)
if err != nil {
return false, err
}
if len(addrs) == 0 {
return false, fmt.Errorf("no addrs found for host, %s", host)
}
for _, addr := range addrs {
if !net.ParseIP(addr).IsLoopback() {
return false, nil
}
}
return true, nil
}
func validateLocalURL(v string) error {
u, err := url.Parse(v)
if err != nil {
return err
}
host := u.Hostname()
if len(host) == 0 {
return fmt.Errorf("unable to parse host from local HTTP cred provider URL")
} else if isLoopback, err := isLoopbackHost(host); err != nil {
return fmt.Errorf("failed to resolve host %q, %v", host, err)
} else if !isLoopback {
return fmt.Errorf("invalid endpoint host, %q, only host resolving to loopback addresses are allowed", host)
}
return nil
}
|
