I am trying to automatically create certificate using LetsEncrypt DNS-01 challenge.
My setup is as follow (I currently uses the Staging API) :
We have our domain, let’s call it “example.net”
We also have multiple subdomain managed by our own DNS.
One of the zone is delegated to an Azure DNS Zone (ie *.client.qa.web.example.net )
In this zone, I have multiple CNAME reccords for my actual websites ( ie website1.client.qa.web.example.net, website2.client.qa.example.net)
I can sucessfully create the _acme-challenge for my dns reccord
name : _acme-challenge.website1.client.qa.web.example.net
When I “dig” the reccord, I have the following answer (I obviously changed actual DNS names to example.net)
; <<>> DiG 9.11.1-P1 <<>> -t txt _acme-challenge.website1.client.qa.web.example.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45481
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
; COOKIE: 12477e09a21bcdfd (echoed)
;; QUESTION SECTION:
;_acme-challenge.website1.client.qa.web.example.net. IN TXT
;; ANSWER SECTION:
_acme-challenge.website1.client.qa.web.example.net. 1 IN TXT "N14G9FPTbZQOwjrcj1NSAMz6PRhSVHfSZTJpsyEVXNU.MuhCFQQlvT31aAuU1sA3xH0itW1YU9QhjqnYhruDEkM"
However, when I complete the challenge, I have the following answer
"detail": "Correct value not found for DNS challenge",
Any help would be appreciated since I don’t know what is wrong in my setup
make sure you don’t quotes within the TXT record.
Reccord is not quoted. I guess this is added by dig
Value from Azure portal is as follow :
can you show the complete command you run (change the domain part only)
dig -t TXT _acme-challenge.website1.client.qa.web.example.net
even by using Google’s Nameserver
dig -t TXT _acme-challenge.aker-cd.abg.qa.web.sldev.net @184.108.40.206
I still get the same result :
;; ANSWER SECTION:
_acme-challenge.aker-cd.abg.qa.web.sldev.net. 0 IN TXT "N14G9FPTbZQOwjrcj1NSAMz6PRhSVHfSZTJpsyEVXNU.MuhCFQQlvT31aAuU1sA3xH0itW1YU9QhjqnYhruDEkM"
You’re using a bespoke client? That’s not the correct value. DNS-01 is different from HTTP-01. It should look something like this:
_acme-challenge.2017-08-14.mattnordhoff.win. 0 IN TXT "SE3rgzyr8_u0Dut_6GxFEEP5kfh14oFMr4crOKr5GJw"
https://tools.ietf.org/html/draft-ietf-acme-acme-07#section-8.5 DNS Challenge
https://tools.ietf.org/html/draft-ietf-acme-acme-07#section-8.3 HTTP Challenge
I don’t understand ACME very well, and you should read the draft (or one of the older drafts) or other documentation, but i believe the DNS value should be base64(SHA256(key authorization)) rather than the key authorization directly.
I am using Certes (https://github.com/fszlin/certes) for DNS authorization.
Your comment made think that maybe there was an issue with DNS and found that the doc is missing for this particular case ( https://github.com/fszlin/certes/issues/2)
I managed to make it work by adding the piece of code described. Thanks for pointing me in the right direction !
Hey. I’ve made a hook for the dehydrated client for DNS-01 verification in Azure:
We’re using it on around 20 servers without issues. Let me know if you need assistance. There’s a small glitch in the latest release which has already been fixed in HEAD but if you’re interested I’ll do an actual release with the fix included, just let me know.
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