Author Posts

August 19, 2017 at 11:34 am

I am trying to loginto a web application called Thruk.. it is using the OMD version.

I am using invoke-webrequest to use a websession to try and connect to a local thruk omd instance. I am trying to correlate the forms the best i can from the examples but when I try and submit the web session the output just keeps going back to the login page.

This is the following code I run:

add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
    public bool CheckValidationResult(
        ServicePoint srvPoint, X509Certificate certificate,
        WebRequest request, int certificateProblem) {
            return true;
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

$login = Invoke-WebRequest "https://icinga/bcmonitoring/thruk/cgi-bin/login.cgi?bcmonitoring/thruk/" -SessionVariable fb
$login.Forms[0].Fields.loginuser = $cred.UserName
$login.Forms[0].Fields.password = $cred.GetNetworkCredential().Password
$UAstring = "Firefox"
$mainPage = Invoke-WebRequest ("https://icinga/bcmonitoring/thruk/cgi-bin/login.cgi?bcmonitoring/thruk/") -WebSession $fb -Body $login -Method Post -UserAgent $UAstring 

This is the output:

The above is just an excerpt. Any help will be most appreciated...

August 19, 2017 at 10:25 pm

Here's what I came up with using the Thrunk Demo page.

#Initialize Session
$R=Invoke-WebRequest -SessionVariable thrunksession

#Set Login and Password

$R=Invoke-WebRequest -Uri ("" + $R.Forms[0].Action) -WebSession $thrunksession -Method POST -Body $R.Forms[0].Fields

$R=Invoke-WebRequest -Uri ("") -WebSession $thrunksession -Method POST

August 20, 2017 at 6:17 am

Thanks @Curtis!

I compared and contrasted your code and saw that the difference that you had was


where I put it as loginuser

Thats because that is what i see in the output:

Id Method Action    Fields                                                     
-- ------ ------    ------                                                     
   post   login.cgi {[referer, ], [loginuser, ], [password, ], [submit, Login]}

I am curious why is that powershell understood login instead of login user. Is this how it is designed?

August 20, 2017 at 12:07 pm

loginuser is the ID of the field, but the name of the filed is login.

August 20, 2017 at 12:43 pm

Oh, so i am assuming you were looking at the inputfields property?

innerHTML : 
innerText : 
outerHTML : 
outerText : 
tagName   : INPUT
id        : loginuser
class     : logininput
name      : login

August 21, 2017 at 3:37 am

I actually used the developer tools of IE and/or Chrome to look at the form html on the page.