How does SSL work on two connected domains? - ssl

I've read through related questions but couldn't quite find what I am looking for.
I have set up a domain just as "domain.com" and created two subdomains "client.domain.com" and "client-intern.domain.com". Further, there is a redirect active for "client.domain.com/intern" pointing to "client-intern.domain.com".
If I buy a single SSL certificate for "client.domain.com", will the data transfer also be secured when the client is going to "client.domain.com/intern"?
Or do I have to purchase a second certificate for "client-intern.domain.com"?
Thanks in advance for clarification,
Paul
UPDATE: If entering "client.domain.com/intern" into the web browsers address bar, this address remains there and the browser shows the content of "client-intern.domain.com" nonetheless.

You need a wildcard certificate to cover multiple subdomains (in your case domain.com, client.domain.com and client-intern.domain.com). Some CAs might offer you an option to include one or two subdomains into the certificate (as alternative name field) for free or for a small additional fee, but this is CA-dependent and in general the right way is a wildcard certificate. You can read about wildcard certs here (GlobalSign site).

Related

DNS records cannot be found for SSL certificate using custom domain on GAE

I am trying to add a custom domain to GAE but Google is struggling to issue an SSL certificate for the naked domain, as it says the DNS records could not be found.
I have tried to map both the naked domain and the www subdomain. When I entered these in the GAE custom domain section I was given 4xA records (above), 4xAAAA records (above), and 1x CNAME record for the www subdomain.
I've entered all of these records at GoDaddy.
The www subdomain in GAE was able to verify the DNS records relatively promptly but the naked domain has not been able to for 4/5 days now.
When I use a DNS lookup tool to check the A records, for the naked domain I see:
...and the four records provided by GAE are there (the other two can't be deleted or edited at GoDaddy). So why is GAE saying the DNS records cannot be found?
And when I use the same tool to lookup the www subdomain I see:
...which I guess must be correct as the certificate has issue without any problems.
If I remove the naked domain from GAE custom domain mapping then users just see a Google generated 404 error message saying the URL was not found on their servers.
Without the SSL, I can navigate to the naked domain using HTTP and I get redirected to the www subdomain (not sure if this is GoDaddy domain forwarding or Django PREPEND_WWW in action - both are setup). But if I try HTTPS on the naked domain, I get a page cannot be displayed due to failing to establish a secure connection, therefore I really need to get to the bottom of the SSL issuing problem.
I am not sure where I am going wrong and would appreciate some suggestions.
The traffic is confused, that is why the naked domain is not working because it was pointing to 2 separate vendors (server) by using the A record one from godaddy and another one from GAE. What you are doing is correct by adding the A record from GAE to your godaddy DNS. However the A record from godaddy must be deleted.
Based from this link possibly there is a forwarding setup wherein your domain is lock from the godaddy’s A record. It was also mentioned in the link that if you don't have forwarding setup, you can reach for their assistance on this link
Another possible concern is that a preset has been set on the account that permanently forwards your domain. It was suggested to remove the preset or change the settings of the preset to unlock the A record.

Arbitrary Sub-Subdomains

We have a project where we want customers to be able to enter our site by way of a custom subdomain. This is not an issue on our main domain, example.com, as we can use the traditional wildcard method: customer.example.com.
Where this gets tricky, is with our development subdomains. So, for example, we may have dev.example.com. This would require the use of...
customer.dev.example.com
...where 'customer' is an arbitrary value, not contained in DNS. This would be handled by the web server and tied to a customer value.
Is this possible?
There are a couple of options that can satisfy this need. A number of vendors offer something called a Cloud Certificate. This is an all-encompassing certificate that lists a number of SANs under one roof. The downsides are that they are both expensive, and any changes require a separate purchase and installation.
The better solution is to purchase a series of wildcard certificates for each subdomain you wish to use. For example, for the domain example.com, you would have the wildcard certificate *.example.com, but you could also purchase subdomain wildcards, such as *.a.example.com, *.b.wildcard.com, etc. These are separate certificates that can all be generated using the same CSR and use the same private key. Even better, they are distinct from one another, can be purchased separately, and you add any further subdomain you need by simply buying its corresponding wildcard certificate.

SSL on primary subdomain not showing securely

Hoping this doesn't come across as a stupid question. Server and SSL stuff isn't my forte.
I've got a wildcard SSL cert and on my root domain it works. On one of my subdomains it show securely. But on a second subdomain I get the broken padlock.
www.mydomain.ca - secure
www.subdom.mydomain.ca - secure
www.subdom2.mydomain.ca - broken padlock
Now with the root domain I know its a particular CMS, the first subdom is a Drupal site and the one that is broken right now is hosted in Azure.
I suppose my question is do I need to install a seperate SSL cert on my subdom2? (For all I know it was done to the first subdom before my time). Or is the nature of a wildcard SSL cert to cover anything that's a subdomain - provided that all the content is being served securely on the website?
Update
If anyone comes across this, the issue was our vendor was serving an image that wasn't https. In the end in the issue had nothing to do with my wildcard SSL cert and it looks as though it does in fact cover all subdomains as long as content is being served securely!
If anyone comes across this, the issue was our vendor was serving an image that wasn't https. In the end in the issue had nothing to do with my wildcard SSL cert and it looks as though it does in fact cover all subdomains as long as content is being served securely!

Pointing GoDaddy DNS to GitHub page uses http over https

I have my DNS settings as shown in the image
DNS Setting along with an additional CNAME with host www and value as my GitHub page. Next I setup a CNAME entry in my GitHub page with an apex entry to my domain. The issue I face is that whenever I visit my domain with an https protocol, it shows a warning that the connection is not secure. I get the following in Chrome:
NET::ERR_CERT_COMMON_NAME_INVALID
How do I fix this? I have both https and http access for my domain.
UPDATE: Github introduced custom domain support for HTTPS on May 1, 2018.
If you are using GoDaddy and want to upgrade to HTTPS, do the following:
Go to DNS settings for your site in your GoDaddy account.
Remove all existing A records.
Open a terminal and do dig +noall +answer <YOUR-USERNAME>.github.io. You should see a table listing 4 slightly different IP addresses:
On GoDaddy, create 4 new A records, each one pointing to one of the IPs. For host use # and set the TTL to a low user-defined value (if you are in a hurry).
Go to your page repository settings on Github, and clear the custom domain name and save. Wait a while (minutes).
When executing dig +noall +answer <YOUR-CUSTOM-DOMAIN> yields the 4 IP addresses that you entered in the A records, go back to the Github repository settings and re-enter and save your custom domain name (which you just cleared) in the custom domain cell.
Optionally, check the box Enforce HTTPS. But make sure that https://<YOUR-DOMAIN>is responsive first.
Make sure you have a CNAME record in your DNS settings also. Host should be www and it should point to your <YOUR-USERNAME>.github.io.
Make sure there is a file in your website repository named CNAME containing the name of your custom domain (in my case ulfaslak.com).
Reference
EDIT: Please see answer below by Arturo Herrero: https://stackoverflow.com/a/50203412/462015
GitHub pages does not support HTTPS for custom domains.
The only work around for doing so is to use an SSL provider as the middle man, such as Cloudflare. However, this would involve pointing your DNS name servers at Cloudflare's, which takes some time and complicates things.
If you want HTTPS support using GitHub pages you'll have to use GitHub's provided URL instead of your custom domain.
Another great option for static sites if you want custom domain name HTTPS is Amazon Web Services. You could set up an S3 bucket for your static website, configure CloudFront to distribute the static content, point your domain name at the CloudFront distribution, and use a free SSL certificate from Amazon's cert manager. This option comes out to less than $1/Month with a low-traffic website. A great in depth tutorial for that would be here.
I hope this answered your question! GitHub pages is a great hosting option, and it's not the end of the world if you decide to forget about HTTPS.
Custom domains on GitHub Pages gain support for HTTPS since May 01, 2018
https://blog.github.com/2018-05-01-github-pages-custom-domains-https/

Can you have an alias for a subdomain with a ssl cert

I have a wildcard certificate for our domain. *.domain.com
We host multiple sites on our one server using host headers with subdomains. In this specific case lets use site1.domain.com the site has a https binding on the hostname with the wildcard ssl cert.
for marketing reasons we want to rename the sites URL / Name. for example awesomewebsite.com
But for hosting and ssl certificate reasons we cant simply change the host headers on the site.
So my question. Is there a way for me to make awesomewebsite.com an alias tohttps://site1.domain.com so that the user can operate and use the site as if it was hosted at awesomewebsite.com and for security reasons all requests are actually sent to https://site1.domain.com
I have both the domains with 'dyndns.org' I know they offer some added services. Not sure if that will be of any user to me?
Also if I can obtain this are there any security concerns or other issues which might be introduced.
When using webhop feature in dyndns.org i get the following error:
Refused to display 'https://site1.domain.com/Account/Login?ReturnUrl=%2F' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'
So my question. Is there a way for me to make awesomewebsite.com an alias tohttps://site1.domain.com so that the user can operate and use the site as if it was hosted at awesomewebsite.com and for security reasons all requests are actually sent to https://site1.domain.com
The validation of the contents of the certificate is done against the name in the URL, which means that your certificate must contain the alias name too.
Never answered properly.
For whom who ends up here during a search:
What you need is a certificate (requested) with alternative names, meaning it contains all the variances you desire of FQDN/DNS names. They do not need to match or belong to the same domain. Also ideal for external name and system internal names (e.g. www.mystuff.com, host123.myhost.com):
https://www.digicert.com/subject-alternative-name.htm