Skip to main content

Making OWA canary's sing using cookies in your OWA scripts

In Exchange 2007 SP3 Microsoft implemented canaries in OWA to help prevent man in the middle/cross scripting attacks in OWA gives a good explanation around why you would want to use a canary and what it is. But put basically a canary is a secret between the client and server in OWA this gets stored in cookie collection of your browser and then it gets submitted with the various requests that your browser sends. If your request doesn't have the canary then the server pretty much says "no OWA for you!". Because in the scripting world it can be useful as a workaround to instrument OWA to automate particular things such as enabling the extended junk-Email rule in OWA and Outlook in the past I've posted scripts that use OWA automation that have now pretty much been broken by the canary's.

So to fix this you need to add some code that will deal with the canary my favorite object to use for these type of scripts is the MSXML2.ServerXMLHTTP object because this handles all the FBA cookies in OWA without the need to add lines of code. To Get the canary from the cookie collection once you have logged on it needs another request to the mailbox your going to access which if things go well means your cookie collection should now be populated and you can just parse the cookie with a few lines of script eg

req.Open "GET", "https://" & snServername & "/owa/" & Targetmailbox & "", False
req.SetOption 2, 13056
req.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
req.setRequestHeader "Content-Length", Len(xmlstr)
req.send szXml
reqhedrarry = split(req.GetAllResponseHeaders(), vbCrLf,-1,1)
for each ent in reqhedrarry
wscript.echo ent
cookie = req.getResponseHeader("Set-Cookie")
if instr(cookie,"=") then
slen = instr(cookie,"=")+1
elen = instr(slen,cookie,"&")
canary = mid(cookie,slen,elen-slen)
wscript.echo "parsed canary : " & canary
end if

Once you have the canary you need to make sure you include it in your request for the junkemail script you need to modify the XML sent to look like

"<params><canary>" & canary & "</canary><fEnbl>1</fEnbl></params>"

And if everything is good your canary should sing to OWA to and achieve what it is your asking it to do. I've put a updated version of the junkemail script here

Popular posts from this blog

Export calendar Items to a CSV file using EWS and Powershell

Somebody asked about this last week and while I have a lot of EWS scripts that do access the Calendar I didn't have a simple example that just exported a list of the Calendar events with relevant information to a CSV file so here it is. I've talked on this one before in this howto  but when you query the calendar folder using EWS you need to use a CalendarView which will expand any recurring appointments in a calendar. There are some limits when you use a calendarview in that you can only return a maximum of 2 years of appointments at a time and paging will limit the max number of items to 1000 per call. So if you have a calendar with a very large number of appointments you need to break your query into small date time blocks. In this example script I'm just grabbing the next 7 days of appointments if you want to query a longer period you need to adjust the following lines (keeping in mind what I just mentioned) #Define Date to Query $StartDate = (Get-Date) $EndDate

Downloading a shared file from Onedrive for business using Powershell

I thought I'd quickly share this script I came up with to download a file that was shared using One Drive for Business (which is SharePoint under the covers) with Powershell. The following script takes a OneDrive for business URL which would look like This script is pretty simple it uses the SharePoint CSOM (Client side object Model) which it loads in the first line. It uses the URI object to separate the host and relative URL which the CSOM requires and also the SharePointOnlineCredentials object to handle the Office365 SharePoint online authentication. The following script is a function that take the OneDrive URL, Credentials for Office365 and path you want to download the file to and downloads the file. eg to run the script you would use something like ./spdownload.ps1 '

Writing a simple scripted process to download attachmentts in Exchange 2007/ 2010 using the EWS Managed API

Every complicated thing in life is made up of smaller simpler building blocks, when it comes to writing a script (or any code really) the more of these little building blocks you have to figure out the more the process of solving a problem can become bewildering. The Internet generally provides you with lots of half eaten sandwiches of information something someone else has taken a bite out but a lot of the time half done, and as with any code its usefulness declines over time as new and better API's and methods are derived. In this post I'm going to go through a simple scripted process that hopefully covers a few more of these smaller building blocks that you might face when asked to come up with a simple costless solution to perform an automated business function with a script. So the process im going to look at is one that comes up a lot and that is you have an Email that comes into to certain mailbox every day with a certain subject in my case "Daily Export" this
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.