108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"encoding/xml"
|
|
"fmt"
|
|
"golang.org/x/crypto/ssh/terminal"
|
|
"net/http"
|
|
"os"
|
|
"strings"
|
|
"syscall"
|
|
)
|
|
|
|
// The XML response returned by the WatchGuard server
|
|
type Resp struct {
|
|
Action string `xml:"action"`
|
|
LogonStatus int `xml:"logon_status"`
|
|
LogonId int `xml:"logon_id"`
|
|
Error string `xml:"errStr"`
|
|
Challenge string `xml:"chaStr"`
|
|
}
|
|
|
|
func main() {
|
|
args := os.Args[1:]
|
|
|
|
if len(args) != 1 {
|
|
fmt.Fprintln(os.Stderr, "Usage: watchblob <vpn-host>")
|
|
os.Exit(1)
|
|
}
|
|
|
|
host := args[0]
|
|
|
|
username, password, err := readCredentials()
|
|
if err != nil {
|
|
fmt.Fprintf(os.Stderr, "Could not read credentials: %v\n", err)
|
|
}
|
|
|
|
fmt.Printf("Requesting challenge from %s as user %s\n", host, username)
|
|
challenge, err := triggerChallengeResponse(&host, &username, &password)
|
|
|
|
if err != nil || challenge.LogonStatus != 4 {
|
|
fmt.Fprintln(os.Stderr, "Did not receive challenge from server")
|
|
fmt.Fprintf(os.Stderr, "Response: %v\nError: %v\n", challenge, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
token := getToken(&challenge)
|
|
err = logon(&host, &challenge, &token)
|
|
|
|
if err != nil {
|
|
fmt.Fprintf(os.Stderr, "Logon failed: %v\n", err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
fmt.Printf("Login succeeded, you may now (quickly) authenticate OpenVPN with %s as your password\n", token)
|
|
}
|
|
|
|
func readCredentials() (string, string, error) {
|
|
fmt.Printf("Username: ")
|
|
reader := bufio.NewReader(os.Stdin)
|
|
username, err := reader.ReadString('\n')
|
|
|
|
fmt.Printf("Password: ")
|
|
password, err := terminal.ReadPassword(syscall.Stdin)
|
|
fmt.Println()
|
|
|
|
// If an error occured, I don't care about which one it is.
|
|
return strings.TrimSpace(username), strings.TrimSpace(string(password)), err
|
|
}
|
|
|
|
func triggerChallengeResponse(host *string, username *string, password *string) (r Resp, err error) {
|
|
return request(templateUrl(host, templateChallengeTriggerUri(username, password)))
|
|
}
|
|
|
|
func getToken(challenge *Resp) string {
|
|
fmt.Println(challenge.Challenge)
|
|
|
|
reader := bufio.NewReader(os.Stdin)
|
|
token, _ := reader.ReadString('\n')
|
|
|
|
return strings.TrimSpace(token)
|
|
}
|
|
|
|
func logon(host *string, challenge *Resp, token *string) (err error) {
|
|
resp, err := request(templateUrl(host, templateResponseUri(challenge.LogonId, token)))
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if resp.LogonStatus != 1 {
|
|
err = fmt.Errorf("Challenge/response authentication failed: %v", resp)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func request(url string) (r Resp, err error) {
|
|
resp, err := http.Get(url)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
defer resp.Body.Close()
|
|
decoder := xml.NewDecoder(resp.Body)
|
|
|
|
err = decoder.Decode(&r)
|
|
return
|
|
}
|