Category: Programmazione

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Register a web application with Azure AD Portal App Registration to connect to a Microsoft 365 tenant

PowerShell Limits

Through Powershell it is possible to connect to a Microsoft 365 tenant to perform operations on users, groups and any other element of the tenant. When you use this tool, Powershell presents you with the mask for entering your account and password. You can write accounts and passwords directly in the Powershell script but it would be a serious security compromise.

Application

An alternative is to build a software that connects directly to the Tenant through customized keys present in the Tenant itself. In other words, it is necessary to communicate to the Tenant that there is a certain application that is authorized to access the Tenant. Furthermore, for each operation that you want to perform on the Tenant it is necessary to specify the appropriate permissions. To create these applications, we recommend that you follow the excellent tutorial “.Net Core console application for calling Microsoft Graph“.  This post proposes the images present in the previous tutorial only to specify how the application must be prepared on the Microsoft Tenant.

Register a web application with Azure AD Portal App Registration

Open a browser and navigate to the Azure Portal. Login using your account. Select the resource “Azure Active Directory”. On the left side menu, select “App regitstration”. Click New registration from the current page.

On the Register an application page, specify the following values:

  • Name = Name of your Application
  • Supported account types
  • Redirect URI
    • Type = Web
    • Value = https://localhost:8080   (*)

(*) The Redirect URI value must be unique within your domain. This value can be changed at a later time and does not need to point to a realy hosted URI.

It is now necessary to store 2 values that will be used in your application:

  • Application (client) ID
  • Directory (tenant) ID

Certificates & secrets

Click Certificates & secrets.

  1. Click New client secret.
  2. On the Add a client secret dialog, specify the following values:
    • Description = Your secret’s description
    • Expires = In 1 year (for example)
  3. Click Add.

After the screen has updated with the newly created client secret copy the VALUE of the client secret. This secret string is never shown again, so make sure you copy it now.

API permissions

Click API permissions.

  • Click Add a permission
  • On the Request API permissions panel select Microsoft Graph.

  • Select Application permissions.

Now you have to choose between the permissions to authorize your app. For example, to create an application to read alla information about Tenant’s users, in the “Select permissions” search box type “User”.Select User.Read.All from the filtered list. At the end, on the API permissions content blade, click Grant admin consent for the Tenant.

Summary of the data necessary for the application

Let’s see what data your application needs to connect and operate on the Microsoft Tenant.

  • applicationId = “xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
  • applicationSecret = “xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
  • tenantId = “xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”;
  • redirectUri = “https://localhost:8080”;
  • domain = “yourtenant.onmicrosoft.com”;

Permissions

  • User.Read.All : Read all users’ full profiles
  • User.ReadWrite.All : Read and write all users’ full profiles
  • Group.ReadWrite.All : Read and write all groups
  • Notes.ReadWrite.All : Read and write all OneNote notebooks

Documentation

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CS1617: Invalid option ‘6’ for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default

Compiler Error CS1617

Invalid option ‘option’ for /langversion. Use ‘/langversion:?’ to list supported values.

For example

Invalid option ‘6’ for /langversion; must be ISO-1, ISO-2, 3, 4, 5 or Default

Solution

Right click on your project and select “Properties” from menu.

Select Build menu and, in the bottom, click on button “Advanced”.

In the next form you don’t have any voice for the field “Language Version”

Select “default”

Done

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How to check the execution of Microsoft Agent Backup

To check the outcome of Microsoft Azure Backup execution we can take advantage of the fact that, if the backup fails, some events are generated.

Prepare script to send email

Copy and paste the following code in a new file and modify it with your data (mail server, user, password, messages).

$SMTPServer = "YOUR SMTP SERVER"
$SMTPPort = "25"
$Username = "USERNAME TO ACCESS SERVER"
$Password = "PASSWORD"

$to = "Email recipient"
# $cc = "cc email recipient"
$subject = "Error Backup MyServer"
$body = "backup failed"
# $attachment = ""

$message = New-Object System.Net.Mail.MailMessage
$message.subject = $subject
$message.body = $body
$message.to.add($to)
# $message.cc.add($cc)
$message.from = $username
# $message.attachments.add($attachment)

$smtp = New-Object System.Net.Mail.SmtpClient($SMTPServer, $SMTPPort);
$smtp.EnableSSL = $true
$smtp.Credentials = New-Object System.Net.NetworkCredential($Username, $Password);
$smtp.send($message)
write-host "Mail Sent"

Save it as file with extension .ps1

Creating a new Task

  1. Open the Task Scheduler : Control Panel -> Administrative Tools -> Task Scheduler
  2. Right-click the “Task Scheduler Library” branch, and select the New Folder option.
  3. Type a name for the folder. For example, MyTasks.
  4. Expand the “Task Scheduler Library” branch, and select the MyTasks folder.
  5. Click the Action menu.
  6. Select the Create Task option.

Task to check Azure Backup

  1. In the Name field you can write something like “Check Micrososft Agent Backup”.
  2. Click the Triggers tab.
  3. Click the New button.
  4. Use the “Begin the task” drop-down menu to select “On a Event”
  5. Click custom option under the Settings section.

  1. Click the Edit Event Filter… button.
  2. Go the XML tab and at the bottom of the menu press the edit query manually button.
  3. Copy and paste the below XML and OK the changes.
<QueryList>
<Query Id="0" Path="CloudBackup">
<Select Path="CloudBackup">*[System[(Level=1 or Level=2) and (EventID=5 or EventID=10 or EventID=11 or EventID=12 or EventID=13 or EventID=14 or EventID=16 or EventID=18)]]</Select>
</Query>
</QueryList>
  1. Click the Actions tab.
  2. Click the New button.
  3. Browse on the previous powershel script
  4. Clicck OK to save the task

From now on, an email should be sent to you when the backup fails.

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c# and shadow copy – notes on library AlphaVSS

AlphaVSS

AlphaVSS is a .NET class library providing a managed API for the Volume Shadow Copy Service also known as VSS

Error loading library AlphaVSS.x64.dll

if you have error loading the library probabilly you need to install on the machine the Visual C++ 2017 Redist package.

You can find it at this link

Control shadow copy

To control shadow copy, created using alphavss library, you have to open a command prompt whith administrative priviliges and type

vssadmin

to list your shadow copy you have to type :

vssadmin list shadows

 

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Configure a Point-to-Site VPN connection via Openvpn on Azure

Create a virtual network

  1. Sign in to the Azure portal.
  2. In Search resources, service, and docs , type virtual network.
  3. On the Virtual Network page, select Create.
  4. On the IP Addresses tab, configure the values

Subnet: If you use the default address space, a default subnet is created automatically.

  • Subnet name: In this example, we named the subnet “FrontEnd”.
  • Subnet address range: The address range for this subnet.

On the Security tab, at this time, leave the default values:

  • DDos protection: Basic
  • Firewall: Disabled

So we will have this configuration (as example) :

  • Address space: 10.1.0.0/16
    Subnet name: FrontEnd
  • Subnet address range: 10.1.0.0/24

Create a virtual network gateway

  1. In the Search the Marketplace field, type ‘Virtual Network Gateway’

SKU: Select the gateway SKU from the dropdown. For Openvpn you need to select VpnGw1 because

Gateway subnet address range: This field only appears if your VNet doesn’t have a gateway subnet. If possible, make the range /27 or larger (/26,/25 etc.)

In this example :

GatewaySubnet: 10.1.1.0/27

Certificates

Certificates are used by Azure to authenticate clients connecting to a VNet over a Point-to-Site VPN connection. You have two options : use a root certificate that was generated with an enterprise solution (recommended), or generate a self-signed certificate.

Generate and export certificates for Point-to-Site using PowerShell

Two steps : generate root certificate; generate client certificate.

root certificate

From a computer running Windows 10 or Windows Server 2016, open a Windows PowerShell console in Admin mode.

Use the following example to create the self-signed root certificate. The following example creates a self-signed root certificate named ‘TestVPNRootCert’ that is automatically installed in ‘Certificates-Current User\Personal\Certificates’.

$cert = New-SelfSignedCertificate -Type Custom -KeySpec Signature -Subject "CN=TestVPNRootCert" -KeyExportPolicy Exportable -HashAlgorithm sha256 -KeyLength 2048 -CertStoreLocation "Cert:\CurrentUser\My" -KeyUsageProperty Sign -KeyUsage CertSign

You can view the certificate by opening certmgr.msc, or Manage User Certificates.

client certificate

Each client computer that connects to a VNet using Point-to-Site must have a client certificate installed. You generate a client certificate from the self-signed root certificate.

From a computer running Windows 10 or Windows Server 2016, open a Windows PowerShell console in Admin mode. Identify the self-signed root certificate that is installed on the computer. This cmdlet returns a list of certificates that are installed on your computer.

Get-ChildItem -Path "Cert:\CurrentUser\My"

As output you will see a string and a name for every certificate installed on your machine.

For example :

AED812AD883826FF76B4D1D5A77B3C08EFA79F3F CN=MyOldVPNRootCert

7181AA8C1B4D34EEDB2F3D3BEC5839F3FE52D655 CN=TestVPNRootCert

Declare a variable for the root certificate using the string from the previous step:

$cert = Get-ChildItem -Path “Cert:\CurrentUser\My\7181AA8C1B4D34EEDB2F3D3BEC5839F3FE52D655”

Modify and run the example to generate a client certificate. The result of the following example is a client certificate named ‘TestVPNClientCert’

New-SelfSignedCertificate -Type Custom -DnsName TestVPNClientCert -KeySpec Signature  -Subject "CN=TestVPNClientCert" -KeyExportPolicy Exportable  -HashAlgorithm sha256 -KeyLength 2048  -CertStoreLocation "Cert:\CurrentUser\My"  -Signer $cert -TextExtension @("2.5.29.37={text}1.3.6.1.5.5.7.3.2")

The client certificate that you generate is automatically installed in ‘Certificates – Current User\Personal\Certificates’ on your computer.

Export the root certificate public key (.cer)

To obtain a .cer file from the certificate, open Manage user certificates. Locate the self-signed root certificate, typically in ‘Certificates – Current User\Personal\Certificates’, and right-click. Click All Tasks, and then click Export. This opens the Certificate Export Wizard.

Select No, do not export the private key, and then click Next

On the Export File Format page, select Base-64 encoded X.509 (.CER)., and then click Next.

For File to Export, Browse to the location to which you want to export the certificate. For File name, name the certificate file. Then, click Next.

Click Finish to export the certificate. You’ll find a file .cer in location selected.

Export the client certificate

To export a client certificate, open Manage user certificates. The client certificates that you generated are, by default, located in ‘Certificates – Current User\Personal\Certificates’. Right-click the client certificate that you want to export, click all tasks, and then click Export to open the Certificate Export Wizard.

Select Yes, export the private key, and then click Next. IMPORTANT!!!!

On the Export File Format page, leave the defaults selected. Make sure that Include all certificates in the certification path if possible is selected

On the Security page, you must protect the private key, using a password.

On the File to Export, Browse to the location to which you want to export the certificate. For File name, name the certificate file. Then, click Next.Click Finish to export the certificate.

Add the client address pool

The client address pool is a range of private IP addresses that you specify. The clients that connect over a Point-to-Site VPN dynamically receive an IP address from this range. Use a private IP address range that does not overlap with the on-premises location that you connect from, or the VNet that you want to connect to.

Open virtual network gateway configuration page, navigate to the Settings section of the virtual network gateway page. In the Settings section, select Point-to-site configuration. Select Configure now to open the configuration page.

In the Address pool box, add the private IP address range that you want to use. VPN clients dynamically receive an IP address from the range that you specify.

For example : 172.16.0.0/24

Tunnel Type : OpenVpn

Authentication Type : Azure certificate

In root certificate section you have to put the root certificate name (in this example TestVPNRootCert).

Open the root certificate file (.cer) with a text editor, such as Notepad. Copy the text as in image and past it in “Public certificate data”

Save Point to Site Configuration.

Download vpn Client clicking on “Download vpn Client” 🙂

Install Openssl

https://slproweb.com/products/Win32OpenSSL.html

Extract the private key and the base64 thumbprint from the .pfx client certificate.

Using OpenSSL on your machine is one way. The profileinfo.txt file contains the private key and the thumbprint for the CA and the Client certificate

openssl pkcs12 -in “C:\myfolder\clientcert_vpn_test.pfx” -nodes -out “C:\myfolder\profileinfo.txt”

Configure openvpn client

Unzip the profile downloaded from virtual network point to site configuration. Next, open the vpnconfig.ovpn configuration file from the OpenVPN folder using Notepad. Open profileinfo.txt in Notepad and copy and paste in vpnconfig.ovpn the sections :

# P2S client certificate
# please fill this field with a PEM formatted cert
<cert>
$CLIENTCERTIFICATE
</cert>
# P2S client root certificate private key
# please fill this field with a PEM formatted key
<key>
$PRIVATEKEY
</key>

IMPORTANT :certificate and kay need to be insert in  openvpncon with  —- begin — and —-end —–