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Configure the CAA record. It's worth
13-11-2017 11:28:32On September this year we have talked about the obligation for SSL certificate issuers to verify the CAA in client DNS records requesting SSL since September 8, 2017. If you are a webmaster now, there is an additional tool in your hands to protect you from invalid certificate issuance.
Low CAA popularity
Due to the buzz around the CAA in 2017, the number of deployments has increased significantly. SSL Pulse reports that the number of sites using CAA has doubled since September 2017, and has grown more than tenfold over the year. Even with this growth rate, only a few thousand websites use CAA, which is still a niche security mechanism ...
Why deploy CAA?
CAA is not just a safety mechanism. In addition to minimizing risk by limiting CAs certification to issuing certificates for your domain, CAA is also a useful tool for enforcing corporate policies related to SSL certificates. Many organizations are struggling to comply with their SSL purchase and deployment policies. This is particularly important in large organizations with many offices or branches.
Example
If someone in your business creates a new service in your domain and requests a certificate, he or she will be able to use a limited list of approved offices. You can also set up a reporting URL or email address to receive notifications from CAs when they receive a request they can not fulfill.
How to implement a CAA record
Since most admins have not yet implemented the CAA, we have prepared a brief manual. CAA is a fairly easy-to-use mechanism and involves a significantly lower risk of configuration or operational errors than other mechanisms such as HSTS or HPKP. There is a technical precondition for using CAA. If you are using managed DNS, the provider must add CAA support because it is a new DNS resource record.
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Specify which CA (Offices) are used by your organization. Create a list. If the list is to include "up to" 10 Offices it's still worth it;
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Use list to enter CA to CAA record;
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You can always update your CAA record if you want to change the list of Certification Authorities
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Create a CAA DNS record.
Sample CAA record
A record that would allow DigiCert to issue certificates for a site:
yourdomain.com. CAA 0 issue "digicert.com"
This record would apply to all subdomains in the domain. If you want to authorize additional CAs, a new line will be created for each CA.
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