Created
October 15, 2021 08:43
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Update NSG with Exchange Online SMTP endpoints
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| $nsgName = "litware-sccm012021-05-10T04-44-28-34" | |
| $nsgResourceGroup = "litware-infra" | |
| $priority = 200 | |
| $sourceAddressPrefix = "*" # zdrojový server/prefix pro odesílání SMTP přes ExO | |
| #region Helper functions | |
| function Set-NsgRule { | |
| param( | |
| $nsg, | |
| $smtpEndpoint, | |
| $addresses, | |
| $family | |
| ) | |
| $ruleName = "$($smtpEndpoint.serviceArea.ToLower())-$($smtpEndpoint.id)-$family" | |
| $existingRule = Get-AzNetworkSecurityRuleConfig -NetworkSecurityGroup $nsg -Name $ruleName -ErrorAction SilentlyContinue | |
| if($existingRule -and $existingRule.DestinationAddressPrefix -ne $addresses) { | |
| Remove-AzNetworkSecurityRuleConfig -Name $ruleName -NetworkSecurityGroup $nsg | Out-Null | |
| } | |
| $nsg | Add-AzNetworkSecurityRuleConfig -Direction Outbound -Name $ruleName -Priority $priority -Protocol Tcp -SourceAddressPrefix $sourceAddressPrefix -DestinationAddressPrefix $addresses -DestinationPortRange $smtpEndpoint.tcpPorts -SourcePortRange * -Access Allow | Out-Null | |
| $global:priority += 1 | |
| $priority | |
| } | |
| function Get-FamilyIpAddresses { | |
| param( | |
| [parameter(Mandatory = $true)] | |
| $Addresses, | |
| [parameter(Mandatory = $true)] | |
| [ValidateSet("Ipv4", "Ipv6")] | |
| $AddressFamily | |
| ) | |
| if($AddressFamily -eq "Ipv4") { | |
| $Addresses | Where-Object { $_.Contains(".") } | |
| } | |
| if($AddressFamily -eq "Ipv6") { | |
| $Addresses | Where-Object { $_.Contains(":") } | |
| } | |
| } | |
| #endregion | |
| #region Update NSG | |
| $nsg = Get-AzNetworkSecurityGroup -Name $nsgName -ResourceGroupName $nsgResourceGroup | |
| $endpoints = Invoke-RestMethod -Method Get -Uri "https://endpoints.office.com/endpoints/worldwide?clientrequestid=3fa58f87-1b7c-4d82-a802-1737f2745ac0&ServiceAreas=Exchange" | |
| $smtpEndpoints = $endpoints | Where-Object { $_.tcpPorts.Split(",").Contains("25") } | |
| foreach($smtpEndpoint in $smtpEndpoints) { | |
| # NSG accept addresses only from the same protocol family | |
| $v4Addresses = Get-FamilyIpAddresses -Addresses $smtpEndpoint.ips -AddressFamily Ipv4 | |
| if($v4Addresses -and $v4Addresses.Count -gt 0) { | |
| Set-NsgRule -family "v4" -nsg $nsg -smtpEndpoint $smtpEndpoint -addresses $v4Addresses | |
| } | |
| $v6Addresses = Get-FamilyIpAddresses -Addresses $smtpEndpoint.ips -AddressFamily Ipv6 | |
| if($v6Addresses -and $v6Addresses.Count -gt 0) { | |
| Set-NsgRule -family "v6" -nsg $nsg -smtpEndpoint $smtpEndpoint -addresses $v6Addresses | |
| } | |
| } | |
| # Save changes | |
| $nsg | Set-AzNetworkSecurityGroup | |
| #endregion |
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