packages/AzStackHci.DiagnosticSettings.0.6.8/Private/AzStackHci.DNS.Helpers.ps1
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# //////////////////////////////////////////////////////////////////////////// # Strict Mode v1 (PS 5.1 safe) - surfaces reads of uninitialised variables at runtime. Set-StrictMode -Version 1.0 # Check DNS to for domain name, and return IP address if found Function Get-DnsRecord { param ( [Parameter(Mandatory=$true)] [ValidateLength(1, 255)] [string]$url, [Parameter(Mandatory=$false)] [switch]$SkipRfc1918Check ) begin { # Write-Debug "Get-DnsRecord: Beginning DNS lookup process" # Initialize variables [bool]$dnsExists = $False } process { Write-Debug "Checking to see if $($url) returns an IP address from DNS" # Remove variables Remove-Variable ipAddress -ErrorAction SilentlyContinue # Call Resolve-DnsName with exponential backoff: retry up to $script:DNS_MAX_RETRIES times # with increasing delays (1s, 2s, 4s + jitter) to avoid flooding DNS on flaky networks. For ($i=1; $i -le $script:DNS_MAX_RETRIES; $i++) { # Remove variables Remove-Variable DNSCheckError -ErrorAction SilentlyContinue # Initialize variables $DNSCheck = @() # Check if the domain name exists in DNS if(-not($dnsExists)){ Write-Debug "DNS attempt $i of 3: Checking DNS server for endpoint '$url'" try { # Check if the domain name exists in DNS using Resolve-DnsName. # //// Use "5>$null" to suppress internal tracing messages such as "DEBUG: 72136". $DNSCheck = Resolve-DnsName -Name $url -Type A -DnsOnly -ErrorAction Stop -ErrorVariable DNSCheckError 5>$null # ///////////////////// # Error handling logic # ///////////////////// } catch [System.Management.Automation.CommandNotFoundException] { # Catch if Resolve-DnsName is not found, not expected throw "Resolve-DnsName cmdlet is not available. This module requires Windows 8/Server 2012 or later." } catch { # Catch DNS Errors # Check if the error message contains 'DNS name does not exist' if($_.Exception.Message.ToString().Contains('DNS name does not exist')) { Write-Debug "DNS Error for '$url' Exception: $($_.Exception.Message)" } else { # All other DNS errors if($i -eq $script:DNS_MAX_RETRIES){ Write-HostAzS "Error: DNS lookup failed for '$url' - Exception Message: $($_.Exception.Message)" -ForegroundColor Red } } # Exponential backoff before next retry: delay = base * 2^(attempt-1) + random jitter if ($i -lt $script:DNS_MAX_RETRIES) { $backoffDelay = $script:DNS_RETRY_BASE_DELAY_SEC * [math]::Pow(2, ($i - 1)) $jitter = Get-Random -Minimum 0.0 -Maximum 0.5 $totalDelay = [math]::Round($backoffDelay + $jitter, 1) Write-HostAzS "DNS lookup failed for '$url' (attempt $i of $($script:DNS_MAX_RETRIES)), retrying in $($totalDelay)s..." -ForegroundColor Yellow Start-Sleep -Milliseconds (($backoffDelay + $jitter) * 1000) } else { Write-HostAzS "DNS lookup failed for '$url' (attempt $i of $($script:DNS_MAX_RETRIES)), no more retries." -ForegroundColor Red } } Finally { # If no DNS errors, set the ipAddress variable to IP address returned from DNS if(-not($DNSCheckError)) { # Check if the DNS name exists, and that $DnsExists is false (IP address not yet found) if($DNSCheck -and (-not($dnsExists))){ if(($DNSCheck.IPAddress).count -gt 1){ # Use first IP address returned from DNS $ipAddress = ($DNSCheck.IPAddress)[0] Write-Debug "Multiple IP addresses returned from DNS for $url, using first IP from list of addresses: $($DNSCheck.IPAddress)" $dnsExists = $True } else { # Only one IP address returned from DNS $ipAddress = $DNSCheck.IPAddress Write-Debug "Single IP address returned from DNS for $url, $ipAddress" $dnsExists = $True } } elseif((-not($DNSCheck))){ # No IP address returned from DNS, but record exists $ipAddress = "No Type A record found in DNS" $dnsExists = $False } else { # Do nothing, DNS already exists } } else { # DNS Error variable exists, set IP address to "DNS Lookup Failed" $ipAddress = "DNS name does not exist" $dnsExists = $False } } # End of Finally block } else { # DNS already exists, skip further checks, but will be on second loop Write-Debug "IP address found from DNS on attempt $($i -1), skipping further name resolution attempts" Break } } # End of For loop three attempts if($dnsExists){ Write-Verbose "DNS lookup successful for $url, returned IP Address: $ipAddress" } else { Write-HostAzS "DNS lookup failed for $url" -ForegroundColor Red Write-Verbose "DNS lookup failed three times for $url - $ipAddress" } # Test if the IP address is RFC1918 private address if(-not($SkipRfc1918Check.IsPresent)){ # Only test if the SkipRfc1918Check switch is not present if($ipAddress -and (-not($ipAddress -in @("No Type A record found in DNS","DNS name does not exist","")))){ # Check if the IP address is in valid IPv4 format if(($IpAddress -match '^(\d{1,3}\.){3}\d{1,3}$')) { # Only test if the IP address is valid Write-Verbose "Testing if returned IP Address '$ipAddress' is an RFC1918 private address" # Check if the IP address is an RFC1918 private address if(Test-IPv4IsRfc1918 -IpAddress $ipAddress){ # IP Address is an RFC1918 private address Remove-Variable testUrl -ErrorAction SilentlyContinue # Ensure URL is lowercase for comparison $testUrl = $url.ToLower() # Tier 1: Check if URL matches critical Arc service Private Link endpoints (NOT SUPPORTED) Remove-Variable isUrlArcServicePrivateLink -ErrorAction SilentlyContinue $isUrlArcServicePrivateLink = $script:PrivateLinkCriticalEndpoints | Where-Object { $testUrl -like $_ } # Tier 2: Check if URL matches PaaS services that support Private Link (proxy bypass needed) Remove-Variable isUrlPaaSPrivateLink -ErrorAction SilentlyContinue $isUrlPaaSPrivateLink = $script:PrivateLinkProxyBypassEndpoints | Where-Object { $testUrl -like $_ } # v0.6.8: when a proxy is enabled, VERIFY (not just advise) whether this # RFC1918-resolving endpoint is actually excluded from the forward proxy via # the WinHTTP bypass list or the NO_PROXY environment variable. Computed once # here; Tier 2/3 branches below use it to emit a GREEN (correctly bypassed) or # YELLOW (missing from bypass) result. Tier 1 (critical Arc) is always RED and # ignores this — Arc endpoints must resolve to PUBLIC IPs regardless of bypass. $bypassCheck = $null if ($script:Proxy.Enabled) { $bypassCheck = Test-EndpointBypassed -Fqdn $url -IpAddress $ipAddress ` -WinHttpBypass $script:Proxy.ProxyBypass -NoProxyEnv $script:Proxy.NoProxyEnv } if($isUrlArcServicePrivateLink){ # Tier 1 — RED: Arc Private Link Scopes NOT supported for Azure Local Write-Debug "URL '$url' matches critical Arc service Private Link endpoint pattern for: '$isUrlArcServicePrivateLink'" Write-HostAzS "CRITICAL: RFC1918 address detected for Arc endpoint '$url'!" -ForegroundColor Red Write-HostAzS "`tArc Private Link Scopes are NOT supported for Azure Local." -ForegroundColor Red Write-HostAzS "`tThis endpoint must resolve to a public IP address. IP returned from DNS: '$ipAddress'" -ForegroundColor Red Write-HostAzS "`tCheck for CNAME Alias in your DNS zones configuration." -ForegroundColor Red Write-HostAzS "`tReference: https://learn.microsoft.com/en-us/azure/azure-local/concepts/firewall-requirements" -ForegroundColor Red Write-HostAzS "Sleeping for 10 seconds..." -ForegroundColor Red Start-Sleep -Seconds 10 $script:PrivateLinkCriticalArray += $url } elseif($isUrlPaaSPrivateLink){ # Tier 2 — PaaS Private Link supported. Verify it is excluded from the proxy. Write-Debug "URL '$url' matches PaaS Private Link endpoint pattern for: '$isUrlPaaSPrivateLink'" if($script:Proxy.Enabled){ if($bypassCheck -and $bypassCheck.Bypassed){ # GREEN — RFC1918 Private Link endpoint correctly excluded from the proxy. Write-HostAzS "OK: RFC1918 (Private Link) detected for '$url' and correctly excluded from the proxy." -ForegroundColor Green Write-HostAzS "`tIP: '$ipAddress' | Matched $($bypassCheck.Source) bypass rule: '$($bypassCheck.MatchedRule)'" -ForegroundColor Green $script:PrivateLinkBypassConfirmedArray += $url } else { # YELLOW — RFC1918 Private Link endpoint is NOT on the bypass list. Write-HostAzS "WARNING: RFC1918 (Private Link) detected for '$url' but it is NOT on the proxy bypass list." -ForegroundColor Yellow Write-HostAzS "`tIP Address returned from DNS: '$ipAddress'" -ForegroundColor Yellow Write-HostAzS "`tAdd this FQDN (or its subnet) to the WinHTTP bypass list / NO_PROXY so traffic routes via ExpressRoute or VPN, not through the proxy." -ForegroundColor Yellow $script:PrivateLinkBypassMissingArray += $url } } else { # No proxy configured — routing must still reach the private endpoint via ExpressRoute/VPN. Write-HostAzS "WARNING: RFC1918 address detected for '$url' - Private endpoint in use." -ForegroundColor Yellow Write-HostAzS "`tIP Address returned from DNS: '$ipAddress'" -ForegroundColor Yellow Write-HostAzS "`tEnsure routing is configured to send traffic via ExpressRoute or Site-to-Site VPN." -ForegroundColor Yellow } $script:PrivateLinkProxyBypassArray += $url } else { # Tier 3 — Other RFC1918. Still verify proxy bypass so the operator gets a definitive signal. if($script:Proxy.Enabled){ if($bypassCheck -and $bypassCheck.Bypassed){ Write-HostAzS "OK: RFC1918 private address detected for '$url' and correctly excluded from the proxy." -ForegroundColor Green Write-HostAzS "`tIP: '$ipAddress' | Matched $($bypassCheck.Source) bypass rule: '$($bypassCheck.MatchedRule)'" -ForegroundColor Green $script:PrivateLinkBypassConfirmedArray += $url } else { Write-HostAzS "WARNING: RFC1918 private address detected for '$url' but it is NOT on the proxy bypass list." -ForegroundColor Yellow Write-HostAzS "`tIP returned from DNS: '$ipAddress'. Add this FQDN (or its subnet) to the WinHTTP bypass list / NO_PROXY." -ForegroundColor Yellow Write-HostAzS "`tAlso check for a CNAME alias of this endpoint in your DNS zones configuration." -ForegroundColor Yellow $script:PrivateLinkBypassMissingArray += $url } } else { # Tier 3 — YELLOW: Other RFC1918 address, informational Write-HostAzS "INFO: RFC1918 private address detected for '$url'. IP returned from DNS: '$ipAddress'" -ForegroundColor Yellow Write-HostAzS "`tCheck for CNAME Alias of endpoint in your DNS zones configuration." -ForegroundColor Yellow } } $script:PrivateLinkDetected = $true $script:PrivateLinkDetectedArray += $url } else { # Do nothing Write-Verbose "Returned IP Address is NOT an RFC1918 private address." } } else { Write-Verbose "Returned IP Address '$ipAddress' is not in valid IPv4 format, skipping RFC1918 private address test" } } else { Write-Debug "Not testing if returned IP Address '$ipAddress' is an RFC1918 private address, as it is not a valid IP address" } } else { Write-Debug "SkipRfc1918Check switch present, skipping RFC1918 private address test" } } # End of process block end { # Write-Debug "Get-DnsRecord: DNS lookup process completed" # Return True/False and IP Address output as a PSObject. $DNSReturnVariable = New-Object PsObject -Property @{ # True/False DNSExists = $dnsExists # IP Address, or "DNS Lookup Failed" IPAddress = $ipAddress } return $DNSReturnVariable } # End of end block } # End of Get-DnsRecord function # //////////////////////////////////////////////////////////////////////////// # Function to test if an IP address is in the RFC 1918 private IP range. # Returns $true if the IP address is in the private range, otherwise returns $false. Function Test-IPv4IsRfc1918 { param ( [Parameter(Mandatory = $true)] [ValidateNotNull()] [ipaddress]$IpAddress ) begin { # Write-Debug "Test-IPv4IsRfc1918: Beginning RFC1918 private IP address check for '$IpAddress'" } process { $IpAddressString = $IpAddress.ToString() # Validated IP is correct IPv4 format if (-not ($IpAddressString -match '^(\d{1,3}\.){3}\d{1,3}$')) { Write-Error "Invalid IPv4 address format." Return $false } $octets = $IpAddressString.Split('.') if ($octets.Count -ne 4) { Return $false } # Convert octets to integers $o1 = [int]$octets[0] $o2 = [int]$octets[1] # 10.0.0.0/8 (10.0.0.0 - 10.255.255.255) if ($o1 -eq 10) { Return $true } # 172.16.0.0/12 (172.16.0.0 - 172.31.255.255) if ($o1 -eq 172 -and $o2 -ge 16 -and $o2 -le 31) { Return $true } # 192.168.0.0/16 (192.168.0.0 - 192.168.255.255) if ($o1 -eq 192 -and $o2 -eq 168) { Return $true } # Not in RFC 1918 private IP range Return $false } # End of process block end { # Write-Debug "Test-IPv4IsRfc1918: RFC1918 private IP address check completed" } } # End Function Test-IPv4IsRfc1918 # SIG # Begin signature block # MIInKAYJKoZIhvcNAQcCoIInGTCCJxUCAQExDzANBglghkgBZQMEAgEFADB5Bgor # BgEEAYI3AgEEoGswaTA0BgorBgEEAYI3AgEeMCYCAwEAAAQQH8w7YFlLCE63JNLG # KX7zUQIBAAIBAAIBAAIBAAIBADAxMA0GCWCGSAFlAwQCAQUABCCBI8Rm6m+1Y/D8 # FK5bV8EcKH6l/BDVvhwK0/8rmyEYuaCCDLowggX1MIID3aADAgECAhMzAAACHU0Z # yE7XD1dIAAAAAAIdMA0GCSqGSIb3DQEBCwUAMFcxCzAJBgNVBAYTAlVTMR4wHAYD # 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