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