DnsPlugins/RFC2136.ps1
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function Add-DnsTxtRFC2136 { [CmdletBinding(DefaultParameterSetName='Secure')] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(Mandatory)] [string]$DDNSNameserver, [string]$DDNSPort=53, [string]$DDNSKeyName, [ValidateSet('hmac-md5','hmac-sha1','hmac-sha224','hmac-sha256','hmac-sha384','hmac-sha512')] [string]$DDNSKeyType, [Parameter(ParameterSetName='Secure')] [securestring]$DDNSKeyValue, [Parameter(ParameterSetName='Insecure')] [string]$DDNSKeyValueInsecure, [string]$DDNSExePath='nsupdate', [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # grab the cleartext key value if it was specified if ($DDNSKeyValue -and 'Secure' -eq $PSCmdlet.ParameterSetName) { $DDNSKeyValueInsecure = (New-Object PSCredential "user",$DDNSKeyValue).GetNetworkCredential().Password } # The nice thing about RFC2136 is that BIND doesn't care if you send duplicate updates # for the same record and value. So we don't need to check whether the record already # exists or not. Even if you're removing a record that's already gone, it still works. # build the params we'll send to the update function $updateParams = @{ RecordName = "$RecordName." TxtValue = $TxtValue Action = 'add' Nameserver = $DDNSNameserver Port = $DDNSPort NSUpdatePath = $DDNSExePath } # add the TSIG params if they were included if ($DDNSKeyName -and $DDNSKeyType -and $DDNSKeyValueInsecure) { $updateParams.TsigKeyName = $DDNSKeyName $updateParams.TsigKeyType = $DDNSKeyType $updateParams.TsigKeyValue = $DDNSKeyValueInsecure } Write-Verbose "Adding $RecordName with value $TxtValue" Send-DynamicTXTUpdate @updateParams <# .SYNOPSIS Add a DNS TXT record using RFC2136 .DESCRIPTION Uses the nsupdate utility to send dynamic updates to an authoritative nameserver. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER DDNSNameserver The hostname or IP address of the authoritative nameserver to send updates. .PARAMETER DDNSPort The port number the nameserver is listening on. Default is 53. .PARAMETER DDNSKeyName When using TSIG authentication, the name of the key you are using. .PARAMETER DDNSKeyType When using TSIG authentication, the type of key you are using. Accepts hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and hmac-sha512. .PARAMETER DDNSKeyValue When using TSIG authentication, the value of the key you are using. This SecureString version can only be used on Windows or any OS with PowerShell 6.2+. .PARAMETER DDNSKeyValueInsecure When using TSIG authentication, the value of the key you are using. This standard String version may be used on any OS. .PARAMETER DDNSExePath The path to the nsupdate executable. The default is just 'nsupdate' which will use the first copy found in the PATH environment variable. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE Add-DnsTxtRFC2136 '_acme-challenge.example.com' 'txt-value' -DDNSNameserver 'ns.example.com' Adds the specified TXT record with the specified value using unauthenticated RFC2136. .EXAMPLE $tsigParams = @{DDNSKeyName='key-name';DDNSKeyType='hmac-sha256';DDNSKeyValueInsecure='key-value'} PS C:\>Add-DnsTxtRFC2136 '_acme-challenge.example.com' 'txt-value' -DDNSNameserver 'ns.example.com' @tsigParams Adds the specified TXT record with the specified value using RFC2136 with SHA256 TSIG authentication. #> } function Remove-DnsTxtRFC2136 { [CmdletBinding(DefaultParameterSetName='Secure')] param( [Parameter(Mandatory,Position=0)] [string]$RecordName, [Parameter(Mandatory,Position=1)] [string]$TxtValue, [Parameter(Mandatory)] [string]$DDNSNameserver, [string]$DDNSPort=53, [string]$DDNSKeyName, [ValidateSet('hmac-md5','hmac-sha1','hmac-sha224','hmac-sha256','hmac-sha384','hmac-sha512')] [string]$DDNSKeyType, [Parameter(ParameterSetName='Secure')] [securestring]$DDNSKeyValue, [Parameter(ParameterSetName='Insecure')] [string]$DDNSKeyValueInsecure, [string]$DDNSExePath='nsupdate', [Parameter(ValueFromRemainingArguments)] $ExtraParams ) # grab the cleartext key value if it was specified if ($DDNSKeyValue -and 'Secure' -eq $PSCmdlet.ParameterSetName) { $DDNSKeyValueInsecure = (New-Object PSCredential "user",$DDNSKeyValue).GetNetworkCredential().Password } # The nice thing about RFC2136 is that BIND doesn't care if you send duplicate updates # for the same record and value. So we don't need to check whether the record already # exists or not. Even if you're removing a record that's already gone, it still works. # build the params we'll send to the update function $updateParams = @{ RecordName = "$RecordName." TxtValue = $TxtValue Action = 'del' Nameserver = $DDNSNameserver Port = $DDNSPort NSUpdatePath = $DDNSExePath } # add the TSIG params if they were included if ($DDNSKeyName -and $DDNSKeyType -and $DDNSKeyValueInsecure) { $updateParams.TsigKeyName = $DDNSKeyName $updateParams.TsigKeyType = $DDNSKeyType $updateParams.TsigKeyValue = $DDNSKeyValueInsecure } Write-Verbose "Removing $RecordName with value $TxtValue" Send-DynamicTXTUpdate @updateParams <# .SYNOPSIS Remove a DNS TXT record using RFC2136 .DESCRIPTION Uses the nsupdate utility to send dynamic updates to an authoritative nameserver. .PARAMETER RecordName The fully qualified name of the TXT record. .PARAMETER TxtValue The value of the TXT record. .PARAMETER DDNSNameserver The hostname or IP address of the authoritative nameserver to send updates. .PARAMETER DDNSPort The port number the nameserver is listening on. Default is 53. .PARAMETER DDNSKeyName When using TSIG authentication, the name of the key you are using. .PARAMETER DDNSKeyType When using TSIG authentication, the type of key you are using. Accepts hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and hmac-sha512. .PARAMETER DDNSKeyValue When using TSIG authentication, the value of the key you are using. This SecureString version can only be used on Windows or any OS with PowerShell 6.2+. .PARAMETER DDNSKeyValueInsecure When using TSIG authentication, the value of the key you are using. This standard String version may be used on any OS. .PARAMETER DDNSExePath The path to the nsupdate executable. The default is just 'nsupdate' which will use the first copy found in the PATH environment variable. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. .EXAMPLE Remove-DnsTxtRFC2136 '_acme-challenge.example.com' 'txt-value' -DDNSNameserver 'ns.example.com' Removes the specified TXT record with the specified value using unauthenticated RFC2136. .EXAMPLE $tsigParams = @{DDNSKeyName='key-name';DDNSKeyType='hmac-sha256';DDNSKeyValueInsecure='key-value'} PS C:\>Remove-DnsTxtRFC2136 '_acme-challenge.example.com' 'txt-value' -DDNSNameserver 'ns.example.com' @tsigParams Removes the specified TXT record with the specified value using RFC2136 with SHA256 TSIG authentication. #> } function Save-DnsTxtRFC2136 { [CmdletBinding()] param( [Parameter(ValueFromRemainingArguments)] $ExtraParams ) <# .SYNOPSIS Not required. .DESCRIPTION This provider does not require calling this function to commit changes to DNS records. .PARAMETER ExtraParams This parameter can be ignored and is only used to prevent errors when splatting with more parameters than this function supports. #> } ############################ # Helper Functions ############################ function Send-DynamicTXTUpdate { [CmdletBinding()] param( [Parameter(Mandatory)] [string]$RecordName, [Parameter(Mandatory)] [string]$TxtValue, [Parameter(Mandatory)] [ValidateSet('add','del')] [string]$Action, [Parameter(Mandatory)] [string]$Nameserver, [int]$Port=53, [string]$TsigKeyName, [ValidateSet('hmac-md5','hmac-sha1','hmac-sha224','hmac-sha256','hmac-sha384','hmac-sha512')] [string]$TsigKeyType, [string]$TsigKeyValue, [string]$NSUpdatePath='nsupdate' ) # build the input array we're going to send to nsupdate via stdin $input = @( "server $Nameserver $Port" "key $($TsigKeyType):$TsigKeyName $TsigKeyValue" "update $Action $RecordName 60 TXT `"$TxtValue`"" 'send' 'answer' ) # remove the "key" line if those variables were empty if (-not $TsigKeyName -or -not $TsigKeyType -or -not $TsigKeyValue) { Write-Debug "Using unauthenticated update" $input = $input[0,2,3,4,5] } else { Write-Debug "Using TSIG authentication with key $TsigKeyName" } try { $answerLines = $input | & $NSUpdatePath 2>&1 } catch { throw } if ($true -notin ($answerLines | ForEach-Object { $_ -like '* status: NOERROR,*' })) { $answerLines | ForEach-Object { Write-Verbose $_ } throw "Unexpected output from nsupdate command. Use -Verbose for details." } } |