52 lines
1.0 KiB
Go
52 lines
1.0 KiB
Go
|
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
|
||
|
|
}
|