Azure App Service - Does a new SSL Cert get automatically used? - azure

We have an Azure app service which has an SSL cert which expires in about 30 days - I have purchased and installed a new SSL cert which is shown in the Azure portal as Healthy with the right expiry date - the about to expire SSL cert is also shown with a warning of its impending expiration.
My question is does the new SSL Cert automatically take over when the old one expires - or do I need to something else - e.g. delete the old SSL
Thanks in advance for any help with this

Firstly, Check whether you have enabled Auto Renew Option if not, find the below steps to enable auto renew .
if Auto Renew is on then it will be renewed automatically before it expires, the linked App Service Apps will be moved to the new certificate.
For Auto Renew App Service Certificate, you could check it in your App Service Certificate -> Auto Renew Settings -> Auto Renew App Service Certificate
below is the link to upload SSL certificate manually.
Or,
To upload your renewed certificate to your app service, also you can use this powershell command [New-AzureRmWebAppSSLBinding] (https://learn.microsoft.com/en-us/powershell/module/azurerm.websites/New-AzureRmWebAppSSLBinding?view=azurermps-6.6.0).

When the question 'Does my app service SSL cert get renewed automatically?' is asked the common response advises the questioner to check the 'Auto Renew' option. But when the SSL cert was purchased from a 3rd party and uploaded to the app service there is no 'Auto Renew' option available. This answer is to address that scenario.
The MS doc here gives details on what to do in an 'uploaded SSL' scenario.
Renew Certificate
Upload the new certificate to the app service via the TLS/SSL option
Bind the new certificate to the same custom domain without deleting the existing, expiring certificate.
Go to your App Service app's TLS/SSL settings pane, and select
'+Add Binding'. This action replaces the binding, rather than remove the existing certificate binding.
You can now delete the existing, expiring certificate
You need to follow these steps because the app service bindings will not automatically update for any hosts when the certificate has been manually loaded in to an App Service Private PFX Certificates.

Related

Problem with SSL WIldcard Certificate on Azure App Service

Firstly I had working custom subdomain for my appservice.
Then I bought SSL wildcard Certificate and then generated pfx file with password. Next I uploaded certificate using Upload Certificate under Private Key Certificates. Certificate has Health Status = Healthy.
Finally, under binding tab I added TLS/SSL binging for my custom domain, choosen this certificate and its type = SNI SSL. Everything seems to be fine, undet custom domain there is SSL State = Secure and SSL Binding = SNI SSL.
When I go to my website - there is no information about any certificates.
I also tried the same with Create App Service Managed Certificate - the same effect, status Healthy, but certificate does not appear on the browser.
#mateuszwdowiak It sounds like you successfully added the SSL binding.
There are two main issues that I can think of that might have proceed the unexpected results that you encountered. Firstly, it can take some time for the SSL certificates to propagate out across the web. From my experience, I've seen it take up to 3 hours. Just because the Azure portal says it's binded, does not mean it will be getting served up just yet.
Secondly, I've seen browser cache also come into play.
It's been a few days but I wanted to see if you resolved this issue. If not, can you please try re-binding your wild card cert, wait up to 3 hours, and then using a fresh browsing session, attempt to browse your site. This should resolve the matter. If not, please reply back so we can assist you further.

Azure Front Door SSL Certificate Update

I have setup a Azure Front Door on top of my Function APIs. I have setup a custom domain and SSL certificate for the same. The certificate was bought from Azure and was set to auto renew. After a year , the certificate has got expired in the front door. The app service certificate was auto-renewed but the Front door did not get the update. I had to manually go to the site to update the certificate with the new secret from the key vault. Why is this happening? Shouldn't the certificate be updated automatically. Please advice.
Please refer to the below link, which says:
Certificate will auto renew within 90 days. But in case if it does not renews then even with less than 60/ 30 days, then need to file a ticket to the support team
https://learn.microsoft.com/en-us/answers/questions/75126/azure-front-door-automatic-ssl-certificate-renewal.html

Assign/import/issue an auto-renewed App Service Certificate in Azure?

I have an App Service Certificate in Azure that is set to auto renew. When I try to import it into the associated App Service, however, I get the error:
App Service Certificate is not issued.
How do I “issue” an App Service Certificate so that it can be assigned to an App Service via import?
App Service Certificate Configuration
To verify the status of the App Service Certificate, I did the following:
Open the “App Service Certificate” under “All Resources”
Click “Certificate Expired” warning (or, alternatively, “Certificate Configuration”)
Confirmed “Certificate successfully imported to Key Vault” (checked)
Confirmed “Domain ownership verified” (checked)
Confirmed “Certificate ready to use in App Service”
Followed instructions under “Step 3: Assign”
App Service Certificate Assignment
To assign the App Service Certificate, I followed the instructions under the Certificate Status’s “Step 3: Assign” window. This is similar to the instructions on Microsoft’s Buy SSL Cert page.
Open the “App Service” under “All Resources”
Click “TSL/SSL Settings”
Click “Private Key Certificates (.pfx)”
Click “Import App Service Certificate”
Click the App Service Certificate (it shows up as expected)
Receive error, “App Service Certificate is not issued.”
Note: The steps above are slightly different than those in the “Certificate Status” page due to changes in the Azure Portal user interface. E.g., “Custom domains and SSL” has been renamed to “TSL/SSL Settings”, and “Certificates” has been renamed to “Private Key Certificates (.pfx)”.
Other Information
As part of troubleshooting this process, I also verified the following:
The certificate is currently marked as expired
“Auto Renew App Service Certificate” is set to “On”
“Manual renewal not allowed at this time… to prevent accidental renewal”
“Rekey is not allowed” since the certificate is not in an issued state
While “Step 3: Assign” reports “Certificate ready to use in App Service”, that step is not checked—presumably because it hasn’t been assigned.
Note: I went through this process last year with this same Subscription, App Service, and App Service Certificate without a problem.
Analysis
The “Step 3: Assign” instructions state “completing all the steps will get the certificate to the Issued state”. It then goes on to say, “An issued App Service certificate may be used on any App Service Web App”. There seems to be a missing step between these, however, as while it reports that “Certificate ready to use in App Service”, the App Service states that the “App Service Certificate is not issued”. How do I get the App Service Certificate to an “Issued” state?
The certificate is currently marked as expired, “Auto Renew App Service Certificate” is set to “On”
As you have said, your certification is expired now, and though you turn on the Auto Renew setting, it does not bind the new cert to the WebApps where the cert it is replacing is currently bound to. You need to manually bind the new cert once it available. Here is an article you could refer to renew your certificate.
Also, if you are creating a new app service certificate and get this error, I suggest you delete it and recreate a new one.

Azure App Service using Self-Signed Cert

I deployed an application out to our app service in Azure, and the app needs to have SSL to run, but since it is still in development I did not want to have to purchase a cert yet, so I created a self-signed cert through openssl. The private key is 2048 bits, which should be enough, but when I go to apply the cert to the hostname, it just sits there and never applies.
Is there a special step you have to complete to get self signed certs to work, or, are you not allowed to use self signed certs in Azure App Services?
Try to use ServerCertificateValidationCallback to monitor the verification of server certificate, comparing the certificates between local and server or just returning true.
Now when you invoke the https service in your web app, the verification callback will be invoked automatically. If failed, you will see the errors. If successful, the service response will be returned.
For more details refer this article: http://devchat.live/en/2017/09/29/how-to-invoke-https-service-protected-by-self-signed-certificate-from-azure-app-service/.

Certificate Renewal Issue in Mobile

We need to implement certificate pinning in our mobile app. We have used Appcelerator Titanium as the framework to build the same.
There is a module with AFNetworking that supports Certificate Pinning.
The concern is, if we store the certificate within the app and bundle it whilst being uploaded to the App Store/Play Store; what happens if the certificate expires?
Do we have to push another update with the renewed certificate bundled? Or is there a mechanism to get the certificate updated within the mobile app?
if we store the certificate within the app and bundle it whilst being uploaded to the App Store/Play Store; what happens if the certificate expires?
You include a truststore in the app which contains the trusted CA root to validate SSL connection. If the root expires then your SSL connection will fail. It is the expected behaviour. You can ignore it (java - ignore expired ssl certificate), but then you are decreasing your security level, that was the main reason to include the trustore
Do we have to push another update with the renewed certificate bundled?
This action will solve the issue. Be aware that if you use a trusted CA (like verisign), the certificates have very long expiration time, so this is not going to be a common action. In fact you'll know well in advance when it expires
Or is there a mechanism to get the certificate updated within the mobile app?
I think it is possible to set a service to download the new trustore before the root CA expires, and use it in Android application with a custom trust manager

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