CODEWITHSUNDEEP
phparchitectureasp-classic
Yury Fedorov
Yury Fedorov

Reputation: 14928

How to access ASP classic session variable from PHP?

I have a login protected back office website written in ASP classic running on Windows. Login status is stored in a session variable. I also have a PHP page that should be accessible only to logged in users. How do I check in PHP that the client is logged in to this website?

P.S. There may be multiple users accessing the page at the same time.

Upvotes: 4

Views: 2357

Answers (2)

WilliamK
WilliamK

Reputation: 781

My solution was to auto-submit a webform which works both ways regardless of whether PHP to ASP or ASP to PHP.

On the leading page simply add an OnLoad to the body tag like so:

<body onload="document.xxx.submit()">

Where "xxx" is the is the ID of your form that contains the hidden fields that you want to pass. For example:

<form id="xxx" action="example.asp" method="post">

This will work locally and across domains.

Upvotes: 1

Kul-Tigin
Kul-Tigin

Reputation: 16950

By assuming both PHP and ASP applications share the same domain name, here's a step by step guide.

1 - Create an asp file named sessionConnector.asp.

2 - In sessionConnector.asp, serialize the Session.Contents object into a format that PHP can deserialize, JSON for example. You can use JSON.asp from aspjson. 

<%@Language=VBScript CodePage=65001%>
<!--#include file="JSON.asp"-->
<%
Set JSONObject = jsObject()

For Each Key In Session.Contents
    If Not IsObject(Session.Contents(Key)) Then 'skip the objects cannot be serialized
        JSONObject(Key) = Session.Contents(Key)
    End If
Next

JSONObject.Flush
%>

3 - Create a PHP function named GetASPSessionState().

4 - In GetASPSessionState(), make an HTTP request for sessionConnector.asp by specifying the Cookie header filled with $_SERVER["HTTP_COOKIE"] which must contains identifier of the ASP Session, so ASP can identify the user and the response will vary by user.

5 - After fetching the response (string of JSON), deserialize by using json_decode and look for the ASP session variable. 

function GetASPSessionState(){
    if(stripos($_SERVER["HTTP_COOKIE"], "ASPSESSIONID") === false){
        # since ASP sessions stored in memory 
        # don't make request to get ASP session state if the cookie does not contain ASPSESSIONID
        # otherwise IIS will create new redundant sessions for each of your checks so it wouldn't be a memory-friendly way
        # returning an empty array
        return array();
    } else {
        $options = array('http' => 
            array('method'=>"GET", 'header' => "Cookie: " . $_SERVER["HTTP_COOKIE"])
        );
        $cx = stream_context_create($options);
        $response = file_get_contents("http://mywebsite.com/sessionConnector.asp", false, $cx);
        return json_decode($response, JSON_FORCE_OBJECT);
    }
}

$aspSessionState = GetASPSessionState();
if($aspSessionState["IsLoggedIn"] == true){
    //user previously logged in with the ASP
}

Upvotes: 10

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