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auth: login: explicit check for ipv6 port bindings #1251

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auth: login: explicit check for ipv6 port bindings #1251

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17 changes: 14 additions & 3 deletions internal/pkg/auth/user_login.go
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,8 @@ func AuthorizeUser(p *print.Printer, authConfig UserAuthConfig) error {
var redirectURL string
var listener net.Listener
var listenerErr error
var ipv6Listener net.Listener
var ipv6ListenerErr error
var port int
startingPort := defaultPort
portRange := configuredPortRange
Expand All @@ -94,18 +96,27 @@ func AuthorizeUser(p *print.Printer, authConfig UserAuthConfig) error {
}
for i := range portRange {
port = startingPort + i
portString := fmt.Sprintf(":%s", strconv.Itoa(port))
ipv4addr := fmt.Sprintf("127.0.0.1:%d", port)
ipv6addr := fmt.Sprintf("[::1]:%d", port)
p.Debug(print.DebugLevel, "trying to bind port %d for login redirect", port)
listener, listenerErr = net.Listen("tcp", portString)
ipv6Listener, ipv6ListenerErr = net.Listen("tcp6", ipv6addr)
if ipv6ListenerErr != nil {
continue
}
listener, listenerErr = net.Listen("tcp4", ipv4addr)
if listenerErr == nil {
_ = ipv6Listener.Close()
redirectURL = fmt.Sprintf("http://localhost:%d", port)
p.Debug(print.DebugLevel, "bound port %d for login redirect", port)
break
}
p.Debug(print.DebugLevel, "unable to bind port %d for login redirect: %s", port, listenerErr)
}
if ipv6ListenerErr != nil {
return fmt.Errorf("unable to bind port for login redirect, tried from port %d to %d: %w", startingPort, port, ipv6ListenerErr)
}
if listenerErr != nil {
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@marceljk marceljk Mar 4, 2026

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this should be extended with a check if ipv6ListenerErr is not nil. It's probably unlikely, but if someone uses already all the ports from 8000-8020, it will continue here without an error and try the authentication flow without an redirect url and the CLI will stop with a panic.

I extended your python code, to simulate this case

#!/usr/bin/env python3
import threading
from http.server import HTTPServer, SimpleHTTPRequestHandler
import socket

HOST = "::1"
PORT = 8000


class IPv6HTTPServer(HTTPServer):
   address_family = socket.AF_INET6

for i in range(0, 21):
   server = IPv6HTTPServer((HOST, PORT + i), SimpleHTTPRequestHandler)
   print(f"Serving on http://[{HOST}]:{PORT+i}")
   t = threading.Thread(target=server.serve_forever)
   t.start()

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@svetlyopet svetlyopet Mar 13, 2026

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Added a check for ipv6ListenerErr with the same message for binding ports error, couldn't think of a more appropriate error message.

return fmt.Errorf("unable to bind port for login redirect, tried from port %d to %d: %w", defaultPort, port, listenerErr)
return fmt.Errorf("unable to bind port for login redirect, tried from port %d to %d: %w", startingPort, port, listenerErr)
}

conf := &oauth2.Config{
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