AzStackHci.DiagnosticSettings

0.7.0

Public/AzStackHci.SSLInspection.ps1

                                # ///////////////////////////////////////////////////////////////////

# Strict Mode v1 (PS 5.1 safe) - surfaces reads of uninitialised variables at runtime.

Set-StrictMode -Version 1.0

# Test-AzStackHciSSLInspection function

# Used to check for the presence of SSL Inspection on traffic sent to a specified URL

# ///////////////////////////////////////////////////////////////////

function Test-AzStackHciSSLInspection {

    <#

    .SYNOPSIS

    Function to check for the presence of SSL Inspection on traffic sent to a specified URL.

    .PARAMETER url

    The URL to test for SSL Inspection

    .DESCRIPTION

    Expects Microsoft or DigiCert certificates to be used for SSL/TLS connections to the specified URL.

    If a different certificate is detected, the script will report that SSL Inspection is present.

    Script checks for redirects and follows them to test further URLs if required.

    Returns $true if SSL Inspection is detected, otherwise $false.

    #>

    [CmdletBinding()]

    [OutputType([bool])]

    param (

        [parameter(Mandatory=$true,HelpMessage="The URL to test for SSL Inspection",Position=0)]

        [System.Uri]$url,

        [Parameter(Mandatory=$false, HelpMessage="Optional switch to prevent console output from the function.")]

        [switch]$NoOutput

    )

    begin {

        # Reset SilentMode at entry — ensures clean state even if a prior call threw while -NoOutput was active

        $script:SilentMode = $false

        # Handle -NoOutput: suppress all console output

        if ($NoOutput.IsPresent) {

            $script:SilentMode = $true

            $VerbosePreference = 'SilentlyContinue'

            $DebugPreference = 'SilentlyContinue'

        }

        # Save the caller's $ErrorActionPreference so we can restore it in end {}.

        # Without this, the 'Stop' preference leaks to the caller's session (C-001).

        $OldErrorActionPreference = $ErrorActionPreference

        $ErrorActionPreference = "Stop"

        Write-HostAzS "`n`t///////////////////////////////////////////////"

        Write-HostAzS "`t Basic SSL Inspection Test for Azure Stack HCI"

        Write-HostAzS "`t///////////////////////////////////////////////`n"

        [bool]$RedirectsComplete = $false

        [bool]$SSLInspectionDetected = $false

        [int]$redirectCount = 0

        Write-HostAzS "Starting SSL Inspection Tests`n"

        Write-HostAzS "Date/Time = $(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')"

        Write-HostAzS "Performing test from hostname: $($env:COMPUTERNAME)`n"

    }

    process {

        try {

        do {

            $redirectCount++

            if ($redirectCount -gt $script:HTTP_MAX_REDIRECTS) {

                Write-HostAzS "Error: Maximum redirect limit ($($script:HTTP_MAX_REDIRECTS)) exceeded. Aborting SSL inspection test." -ForegroundColor Red

                $RedirectsComplete = $true

                break

            }

            $Request = $null

            $Response = $null

            $Request = [System.Net.HttpWebRequest]::Create($url)

            $Request.Method = "GET"

            $Request.AllowAutoRedirect = $False

            $Request.Proxy = [System.Net.WebRequest]::DefaultWebProxy

            Write-HostAzS "Testing SSL/TLS Certificate for endpoint: '$($Request.Address.AbsoluteUri)'"

            try {

                [System.Net.HttpWebResponse]$Response = $Request.GetResponse()    

            }

            catch {

                Write-HostAzS "Error: $($_.Exception.Message)"

                # Make the null-result explicit: the typed assignment above throws before

                # binding, so $Response stays $null and the later `if ($Response)` guard skips it.

                $Response = $null

            }

            try {

            # Check if the certificate subject contains "O=Microsoft" as most SSL inspection appliances will replace the certificate with their own

            if(($Request.ServicePoint.Certificate.Subject).Contains("O=Microsoft")){

                Write-HostAzS -ForegroundColor Green "Expected Certificate Subject Found: `nSubject = $($Request.ServicePoint.Certificate.Subject)"

            } else {

                $SSLInspectionDetected = $true

                Write-HostAzS -ForegroundColor Red "UNKNOWN Certificate Subject Found: `nSubject = '$($Request.ServicePoint.Certificate.Subject)'"

                Write-HostAzS -ForegroundColor Yellow "`tNote: Expected Certificate Contains Subject = 'O=Microsoft'"

            }

            # Check if the certificate issuer contains "O=Microsoft Corporation" or "O=DigiCert Inc" as most SSL inspection appliances will replace the certificate with their own

            if(($Request.ServicePoint.Certificate.Issuer).Contains("O=Microsoft Corporation") -or (($Request.ServicePoint.Certificate.Issuer).Contains("O=DigiCert Inc"))){

                Write-HostAzS -ForegroundColor Green "Expected Certificate Issuer Found: `nCertificate Issuer = $($Request.ServicePoint.Certificate.Issuer)"

            } else {

                $SSLInspectionDetected = $true

                Write-HostAzS -ForegroundColor Red "UNKNOWN Certificate Issuer Found: `nCertificate Issuer = '$($Request.ServicePoint.Certificate.Issuer)'"

                Write-HostAzS -ForegroundColor Yellow "`tNote: Expected Certificate Contains Issuer = 'O=Microsoft Corporation' or 'O=DigiCert Inc'"

            }

            # Root CA thumbprint validation: build the certificate chain and verify the root

            # against a known list of trusted Microsoft/DigiCert root CA thumbprints.

            # This provides a stronger check than string matching alone — a sophisticated

            # MITM could spoof Issuer/Subject strings but not root CA thumbprints.

            try {

                $cert2 = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2($Request.ServicePoint.Certificate)

                $chain = New-Object System.Security.Cryptography.X509Certificates.X509Chain

                $null = $chain.Build($cert2)

                if ($chain.ChainElements.Count -eq 0) {

                    Write-HostAzS -ForegroundColor Yellow "Warning: Certificate chain is empty — unable to validate root CA thumbprint."

                    throw "Certificate chain contains no elements"

                }

                $rootCert = $chain.ChainElements[$chain.ChainElements.Count - 1].Certificate

                if ($script:TRUSTED_ROOT_CA_THUMBPRINTS -contains $rootCert.Thumbprint) {

                    Write-HostAzS -ForegroundColor Green "Root CA Thumbprint Verified: $($rootCert.Thumbprint) ($($rootCert.Subject))"

                } else {

                    $SSLInspectionDetected = $true

                    Write-HostAzS -ForegroundColor Red "UNKNOWN Root CA Thumbprint: $($rootCert.Thumbprint)"

                    Write-HostAzS -ForegroundColor Red "Root CA Subject: $($rootCert.Subject)"

                    Write-HostAzS -ForegroundColor Yellow "`tNote: Root CA thumbprint does not match any known Microsoft/DigiCert root CAs"

                }

            } catch {

                Write-HostAzS -ForegroundColor Yellow "Warning: Unable to build certificate chain for root CA thumbprint validation: $($_.Exception.Message)"

            }

            # If $Response exists, check if for any redirects to further test required URLs

            if($Response){

                if(-not([string]::IsNullOrWhiteSpace($Response.Headers["Location"]))){

                    Write-HostAzS "Checking Redirected URL, as 'HTTP StatusCode = $($Response.StatusCode)'"

                    $url = $Response.Headers["Location"]

                } else {

                    # No redirects found

                    $RedirectsComplete = $true

                }

            } else {

                # No response found, unable to determine if redirects are required

                $RedirectsComplete = $true

            }

            } finally {

                # Ensure the response is always closed/disposed to prevent socket leaks

                if ($Response) { $Response.Close(); $Response = $null }

            }

            Write-HostAzS ""

        } while (

            $RedirectsComplete -ne $true

        ) # End of do..while loop for redirects

        # Note: this test uses both string matching AND root CA thumbprint verification.

        # String matching checks Subject/Issuer for known Microsoft/DigiCert organizations.

        # Thumbprint matching validates the root certificate against known trusted root CA thumbprints

        # from $script:TRUSTED_ROOT_CA_THUMBPRINTS (defined in AzStackHci.Constants.ps1).

        Write-HostAzS -ForegroundColor Yellow "Note: This test verifies certificates by matching Subject/Issuer strings and root CA thumbprints."

        Write-HostAzS -ForegroundColor Yellow "It is not intended to be an exhaustive certificate validity test.`n"

        if($SSLInspectionDetected -eq $true){

            Write-HostAzS -ForegroundColor Red "SSL Inspection Detected!`nCheck your network / proxy server configuration for SSL Inspection - https://learn.microsoft.com/en-us/azure-stack/hci/concepts/firewall-requirements`n"

        } else {

            Write-HostAzS -ForegroundColor Green "No SSL Inspection Detected :-)`n"

        }

        } finally {

            # Restore caller's $ErrorActionPreference even if an exception terminates process {} (C-001)

            $ErrorActionPreference = $OldErrorActionPreference

        }

    } # End of process block

    end {

        if ($NoOutput.IsPresent) { $script:SilentMode = $false }

        Write-HostAzS "SSL Inspection Tests Complete`n"

        # Write-Debug "Completed Test-AzStackHciSSLInspection function"

        return $SSLInspectionDetected

    }

} # End of Test-AzStackHciSSLInspection function

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