Azure Activity Log - azure

Question

I want to monitor who made a change in rbac assignment, I created powershell script for collection data from Azure Activity Log. I used below piece of code. Using this solution I am able to get items like:
caller - user who made a role assignment change,
timestamp,
Resource name - on this resource assignment change has been provided,
action type - write or delete
In Activity Log panel in Azure portal, in Summary portal (Message: shared with "user info"), I can see name of a user who has been granted permissions/assignment to the resource, but using my powershell script I am not able to catch this information, is there any method to get this info?
Get-AzureRmLog -StartTime (Get-Date).AddDays(-7) |
Where-Object {$_.Authorization.Action -like
'Microsoft.Authorization/roleAssignments/*'} |
Select-Object #{N="Caller";E={$_.Caller}},
#{N="Resource";E={$_.Authorization.Scope}},
#{N="Action";E={Split-Path $_.Authorization.action -leaf}},
EventTimestamp
script output:
Caller : username#xxx.com
Resource :/subscriptions/xxxx/resourceGroups/Powershell/providers/Microsoft.Compute/virtualMachines/xx/providers/Microsoft.Authorization/roleAssignments/xxxx
Action : write
EventTimestamp : 8/29/2019 10:12:31 AM

Answer 1

Your requirement of fetching the user name to whom the RBAC role is assigned is currently not supported using Az PowerShell cmdlet Get-AzLog or Get-AzureRmLog.
However, we can accomplish your requirement by leveraging Azure REST API for Activity Logs - List and Az PowerShell cmdlet Get-AzureADUser.
In this way as we are depending on Azure REST API for Activity Logs - List (but looks like you want PowerShell way of accomplishing the requirement) so call the REST API in PowerShell as something shown below.
$request = "https://management.azure.com/subscriptions/{subscriptionId}/providers/microsoft.insights/eventtypes/management/values?api-version=2015-04-01&`$filter={$filter}"
$auth = "eyxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
$authHeader = #{
'Content-Type'='application/json'
'Accept'='application/json'
'Authorization'= "Bearer $auth"
}
$Output = Invoke-RestMethod -Uri $request -Headers $authHeader -Method GET -Body $Body
$ActivityLogsFinalOutput = $Output.Value
Develop your PowerShell code to get "PrincipalId" (which is under "properties") from the output of your Azure REST API for Activity Logs - List call. The fetched "PrincipalId" is the ObjectID of the user whom you want to get ultimately.
Now leverage Az PowerShell cmdlet Get-AzureADUser and have your command something like shown below.
(Get-AzureADUser -ObjectID "<PrincipalID>").DisplayName
Hope this helps!! Cheers!!
UPDATE:
Please find PowerShell way of fetching auth token (i.e., $auth) that needs to be used in above REST API call.
$ClientID = "<ClientID>" #ApplicationID
$ClientSecret = "<ClientSecret>" #key from Application
$tennantid = "<TennantID>"
$TokenEndpoint = {https://login.windows.net/{0}/oauth2/token} -f $tennantid
$ARMResource = "https://management.core.windows.net/";
$Body1 = #{
'resource'= $ARMResource
'client_id' = $ClientID
'grant_type' = 'client_credentials'
'client_secret' = $ClientSecret
}
$params = #{
ContentType = 'application/x-www-form-urlencoded'
Headers = #{'accept'='application/json'}
Body = $Body1
Method = 'Post'
URI = $TokenEndpoint
}
$token = Invoke-RestMethod #params
$token | select access_token, #{L='Expires';E={[timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($_.expires_on))}} | fl *
I see this new way as well but I didn't get chance to test this out. If interested, you may alternatively try this or go with above approach.
UPDATE2:
$ActivityLogsFinalOutput| %{
if(($_.properties.responseBody) -like "*principalId*"){
$SplittedPrincipalID = $_.properties.responseBody -split "PrincipalID"
$SplittedComma = $SplittedPrincipalID[1] -split ","
$SplittedDoubleQuote = $SplittedComma[0] -split "`""
$PrincipalID = $SplittedDoubleQuote[2]
#Continue code for getting Azure AD User using above fetched $PrincipalID
#...
#...
}
}

Answer 2

Does this work for you?
Get-AzureRmLog -StartTime (Get-Date).AddDays(-7) |
Where-Object {$_.Authorization.Action -like 'Microsoft.Authorization/roleAssignments/*'} |
Select-Object #{N="Caller";E={$_.Caller}},
#{N="Resource";E={$_.Authorization.Scope}},
#{N="Action";E={Split-Path $_.Authorization.action -leaf}},
#{N="Name";E={$_.Claims.Content.name}},
EventTimestamp
My output:
Caller : username#domain.com
Resource : /subscriptions/xxxx/resourceGroups/xxxx/providers/Microsoft.Authorization/roleAssignments/xxxx
Action : write
Name : John Doe
EventTimestamp : 30.08.2019 12.05.52
NB: I used Get-AzLog. Not sure if there is any difference between Get-AzLog and Get-AzureRmLog.

Answer 3

Fairly certain this wouldn't be exposed with this cmdlet. I dont even see this information in the Role Assignments. So not sure what do you mean exactly.