Someone has used our email address to register a Let’s Encrypt certificate for what looks like a phishing domain. How can we stop people using our email address for this purpose (as we obviously don’t want to be associated with it, not keep receiving renewal notifications for it).
Is there any mechanism within Let’s Encrypt to set authentication required for an account? Or maybe some standard mechanism to say “I’m the owner of email address … and would like domain … revoked please”
The domain is: appleid.apple.com.greetingsaskaboutorder9281.tk
The email body has a link to unsubscribe from future notices. If you hit that link, you won’t get any expiration notices for the next year. The list of “who’s unsubscribed” is independent for Staging notices and Production notices, so you can feel free to unsubscribe from Staging without affecting your Production status.
So is there any way of stopping this from happening? Or authenticating “I’m the owner of the email address, I’d like to get the chance to approve/reject certificates (or revoke them after the fact) requested using this address”?
You can revoke certificates whenever you want, as long as you control the domain.
You can’t authenticate certificate issuance via email, but you can prevent or control issuance by placing a CAA record on your domain, to the effect of blocking Let’s Encrypt: https://letsencrypt.org/docs/caa/ . At some point in the future, it will be possible to setup a CAA record that only allows a nominated Let’s Encrypt account to issue certificates for your domain, but we’re not quite there yet.
Double-opt-in for emails would be preferable in my opinion, I’m not sure why they didn’t choose that option.
Which domain? The domain the email used OR the domain the certificate was registered for?
CAA record on your domain, to the effect of blocking Let’s Encrypt
Do you mean on our email’s domain OR on this dodgy person’s phishing domain?
Hopefully more comes in the future regarding this as it feels the controls around cert creation are proof of concept level rather than polished professional level. Don’t get me wrong, I love LE - but now our account is getting spam and we can’t just bin our primary company’s contact email address, nor block the emails because we use LE too.
Probably because it isn't consistent with "obtain the cert immediately with a single command".
How so? They validate domain control in accordance with industry practices. With very limited exceptions, they do not block certs for bad actors, as they (correctly) take the position that the cert makes no assertion regarding the trustworthiness of the site you're visiting.
You're getting expiration notices for a domain that doesn't exist any more. After a couple of them, the cert will be expired, and you won't get any more. Your company's email is not "associated" with that phishing domain in any public way.
Very true tdelmas, we’re a UK company so this law definitely applies. However, it is good to know that Let’s Encrypt will never give out our email address from a domain name, even if the authorities ask them “who is the owner of phishing domain X.Y.Z”.
I just suggested the opposite could happen, what makes you think that they will not give it to authorities? (or did you meant, “its better to delete it to be sure Let’s Encrypt will not give our email address if the authorities ask them “who is the owner of phishing domain X.Y.Z”?)