Create a DNS integration to automate DV certificates on load balancers

Before you start, create a DNS script for the operating system you want to automate the DV certificate installation. You can create a script or modify one of the sample scripts to define your script.

For Windows, you need two scripts to prove your control over the domains: DNS .bat script and embedded PowerShell postscript (.ps1, .py, .ps, or any other format).

For Linux, you need a DNS .sh script to prove control over the domains.

Example: ./adddnsintegration.sh -type custom

[root@c7-sowjanya-124 cli]# ./adddnsintegration.sh -type custom

Sensor CLI.  Copyright 2023, DigiCert Inc.
Add a DNS integration to automate DV certificates.

Enter alias:CustomeDNS
Script file path:/tmp/test.sh

DNS integration custom added.
After adding the DNS integration, go back to CertCentral and link the integration to the load balancer where you want to automate a DV certificate.

#ensure AWS PStools are installed incl
#https://docs.aws.amazon.com/powershell/latest/userguide/pstools-getting-set-up-windows.html
#Install-Module -Name AWS.Tools.Installer
#Install-AWSToolsModule AWS.Tools.Route53
#Set-AWSCredential -AccessKey <accesskey> -SecretKey <secretkey> -StoreAs TestDNSProfile

Import-Module AWSPowerShell
Function Set-R53Record {
 
    # Entry parameters
    Param (
		[Parameter(Mandatory=$True)] [String]$Profile,
        [Parameter(Mandatory=$True)][String]$Domain,
        [Parameter(Mandatory=$True)][String]$Type,
        [Parameter(Mandatory=$True)][String]$Name,
        [Parameter(Mandatory=$True)][String]$Value,
        [Int]$TTL = 300,
        [String]$Comment
    )
 
    $DomainDot = $Domain + "."
 
    # Create two objects for R53 update
    $Change = New-Object Amazon.Route53.Model.Change
    $Change.Action = "UPSERT"
    # CREATE: Creates a resource record set that has the specified values.
    # DELETE: Deletes an existing resource record set that has the specified values.
    # UPSERT: If a resource record set doesn't already exist, AWS creates it. If it does, Route 53 updates it with values in the request.
    $Change.ResourceRecordSet = New-Object Amazon.Route53.Model.ResourceRecordSet
    $Change.ResourceRecordSet.Name = "$Name.$Domain"
    $Change.ResourceRecordSet.Type = $Type
    $Change.ResourceRecordSet.TTL = $TTL
    # For TXT-based DNS challenges, value must be in quotes
    $challengeValue = if ($Type -eq "TXT") {"""$Value"""} else {$Value}
    $Change.ResourceRecordSet.ResourceRecords.Add(@{Value=$challengeValue})
 
    # Get hosted zone
    $HostedZone = Get-R53HostedZones -ProfileName $Profile| Where-Object { $DomainDot.EndsWith($_.Name) }
    Write-Output "Found HostedZone:$HostedZone"
    # Set final parameters and execute
    $Parameters = @{
        HostedZoneId = $HostedZone.Id
        ChangeBatch_Change = $Change # Object
        ChangeBatch_Comment = $Comment # "Edited A record"
    }
   return Edit-R53ResourceRecordSet -ProfileName $Profile @Parameters
}

if($args.Length -ne 1){
    Write-Output "Args not found"
    exit -1;
}

$fileInput = Get-Content $args[0]
if ($fileInput.Length -lt 3){
    Write-Output "File not found"
   exit -1;
}
$tempDomains = $fileInput[0].Split(",")
$challenge = $fileInput[2]
$domains = @()
foreach ($d in $tempDomains)
    {
        if ("$d" -ne "null")
        {
            Write-Output $d
            $domains = $domains += $d
        }
    }

foreach ($domain in $domains)
{     
    Set-R53Record -Profile DNSProfileName -Domain $domain -Type "TXT" -Name "_dnsauth" -Value $challenge -TTL 86400 -Comment "DNS challenge for $domain"
}

echo "Invoking DNS script"
pushd %~dp0
powershell.exe -File {DNSPostscriptPath} %*
echo "Exit Code : %errorlevel%"
set returnCode=%errorlevel%
popd
EXIT /B %returnCode%

#!/usr/bin/bash

set_R53_Record(){
    Profile=$1
    Domain=$2
    Type=$3
    Name=$4
    Value=$5
    TTL=$6
    Comment=$7
    DomainDot="$Domain."
    echo "Profile:$Profile Domain:$Domain"
    HOSTEDZONEID=$(/usr/local/bin/aws route53 list-hosted-zones --profile $Profile | jq '.HostedZones | .[] | select(.Name|inside('\"$DomainDot\"')) | .Id' | tr -d '"')
    cat > change-batch.json << EOL
    {"Comment":"$Comment","Changes":[{"Action":"UPSERT","ResourceRecordSet":{"Name":"$Name.$Domain","Type":"$Type","TTL":$TTL,"ResourceRecords":[{"Value":"\"$Value\""}]}}]}
EOL
    /usr/local/bin/aws route53 change-resource-record-sets --hosted-zone-id $HOSTEDZONEID --profile $Profile --change-batch file://change-batch.json
}


if [ "$#" -ne 1 ]; then
    echo "Args not found"
    exit -1;
fi

 IFS=$'\n' read -d '' -r -a lines < $1

if [ ${#lines[@]} != 3 ]; then
    echo "File not found"
    exit -1;
fi

challenge=${lines[2]}

IFS=',' read -ra domains <<< "${lines[0]}"
for domain in "${domains[@]}"; do
    set_R53_Record default $domain "TXT" "_dnsauth" $challenge 86400 "DNS challenge for $domain"
done