I have created an App Service Environment and have multiple web app and web API associated with it. I want to achieve an arrangement where only my App service has access to the API, so trying to block traffic to the API using IP Restriction. But all the Web Apps as well as the web API has the same VIP and i cant find any other IP address associated with it.
Also to attach the NSG to the subnet(in which ASE is there), we need to add rules which again need specific IP. How can I achieve this?
I assume you have provisioned external ASE.
"App Service has the ability to allocate a dedicated IP address to an app. This capability is available after you configure an IP-based SSL"
So, you can limit the access to some of your apps inside the ASE by using App-assigned IP-based SSL addresses (Only possible with an External ASE and when IP-based SSL is configured).
When you provision your ASE, you can select how many external IP addresses the system should have including those for IP-based SSL purposes.
please see: https://learn.microsoft.com/en-us/azure/app-service/environment/using-an-ase#ip-addresses and slide nr.14 here https://8gportalvhdsf9v440s15hrt.blob.core.windows.net/ignite2017/session-presentations/BRK3204.PPTX
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I have an Azure App Service that will have a custom domain and SSL binding in Production. Normally, I would issue the certificate first for the domain, bind to the App Service using an IP-based binding for the given domain, then update DNS entries as required once I know the IP address that Azure has bound.
My client will be issuing the certificate, and they won't do this until they know the exact inbound IP address that will be used for the SSL binding, but I don't believe I can know this IP until I've actually created the binding (which requires the certificate!) so it's a nasty chicken-and-egg scenario.
Is there a way of reserving a static inbound IP address in Azure for this purpose, prior to requiring the certificate? Or would I need to use some sort of gateway in front of the App Service instead, or some other solution I haven't thought of?
Not sure why your client doesn't want to issue the certificate until knowing the exact inbound IP address unless they are trying to have an SSL certificate for the IP address not for the domain name.
If not, to get a reserved or dedicated inbound IP address for the web app, you can easily install and configure an IP-based TLS/SSL certificate at a low cost. Then if the IP address is updated, you just need to update the A record with the new IP address in the DNS provider.
For other choices, you can use either an isolated and dedicated environment for your app service plan or set app service behind an application gateway V2 SKU. See how to Configure App Service with Application Gateway. You can also enable end-to-end TLS by using Application Gateway. Whatever you select one of them, has a higher cost and complicated configuration.
I have App Service which is classic web app written in Node.js. Let's say that my app have 2 endpoints: /SecuredEndpoint and /ClassicEndpoint. /SecuredEndpoint should be secured, meaning only certain IP addresses are allowed to access it. ClassicEndpoint on the other hand is public to whole internet.
I've found out that in Azure I can specify Access Restrictions to whole service for certain IP addresses (I can block/allow access based on IP address). But I would like to secure not the whole app but only certain endpoints.
Can someone help me how can I achieve that in Azure?
To restrict certain IP addresses is to restrict ACL in the networking layer. Access Restrictions are effectively network ACLs. However, it is implemented in the App Service front-end roles, which are upstream of the worker hosts where your code runs. In this case, you could consider selecting to use two app services for each endpoint. You can read supported security in the Azure app service.
Alternatively, you may allow certain IP addresses in your special code. Google some samples for such a feature. It might be like this SO thread. For App Service on Windows, you can also restrict IP addresses dynamically by configuring the web.config. For more information, see Dynamic IP Security.
In addition, If you are interested in securing Back-end App Service Web Apps with VNets and Service Endpoints, you could have a look at this blog.
I am running a Linux container as a web app in an internal ASE.
The ASE is deployed to a Vnet (secondary Vnet) which is peered to a another Vnet(Primary vnet) where an Azure firewall exists.
1.I have Enable service endpoints to SQL, Storage, and Event Hub on your ASE subnet.
2.From the Azure Firewall UI > Rules > Application rule collection, Set App Service Environment FQDN Tag and the Windows Update Tag.
3.From the Azure Firewall UI > Rules > Network rule collection, Set the ports to 123.Create another rule the same way to port 12000 to help triage any system issues.
4.Create a route table with the management addresses from App Service Environment management addresses with a next hop of Internet, set 0.0.0.0/0 directed to the network appliance ( Firewall internal IP address)
5.Create Application rules to allow HTTP/HTTPS traffic (Note: address is the IP of the ILB of the Internal ASE, since I cant find an IP for the web app itself)
I don't seem to be able to reach the web app. Any guidance will be appreciated. is the problem that I created an Internal ASE?
I am trying to isolate the ISE and control external access to it via a firewall.
MSDocs I referenced :https://learn.microsoft.com/en-us/azure/app-service/environment/firewall-integration
Yes, I think it's the problem with internal ASE. Also, the referring document is intended to lock down all egress from the ASE VNet. Inbound management traffic for an ASE can not be sent through a firewall device.
There are a number of inbound dependencies that an ASE has. The
inbound management traffic cannot be sent through a firewall device.
The source addresses for this traffic are known and are published in
the App Service Environment management addresses document. You can
create Network Security Group rules with that information to secure
inbound traffic.
In addition, since it's an internal ASE, it is deployed in your VNet with ILB. You can not directly access its backend web app over the Internet, you need at least a public-facing Ip address (external VIP )or other public-facing services(Public Azure application gateway) in front of it.
It will like this,
I have to restrict public access to my Azure app service, Hence I have implemented IP whitelist in web config. Is it required to whitelist the Azure datacenter IP ranges?
My app service uses Azure SQL, redis and search service.
Short answer to your question is no, you will not need to add Azure data center IP addresses for using Azure services. Only case where you need to add IP addresses to the allow list is when a service/application tries to access your web application and not the other way round.
Given your objective to restrict public access, you should definitely consider using the IP restrictions feature from Azure Portal. Microsoft has improved this feature and it's better than having just the web.config <ipsecurity> configuration,
With Azure App Service IP restrictions, traffic will blocked even
before it reaches your IIS.
You can still continue to use your web.config configuration as it is.
Configuration effort is pretty minimal as it's all available through portal
Read more about it here
Azure App Service Static IP Restrictions
For a time, the IP Restrictions capability in the portal was a layer
on top of the ipSecurity capability in IIS. The current IP
Restrictions capability is different. You can still configure
ipSecurity within your application web.config but the front-end based
IP Restrictions rules will be applied before any traffic reaches IIS.
Given that I create an Azure 'App Service'
How do I ensure that this service is only callable from ...
A.> 2 existing external servers (whose IP addresses will be known)
B.> 3 other App Services which I will be creating, but whose IP Addresses may not be known since I may need to scale those out (Over multiple additional instances)
To clarify... Is there some Azure service that will allow me to treat this collective of machines (both real and virtual) as a single group, such that I can apply some test on incoming requests to see if they originate from this group?
on Azure WebApps, You may wish to know; the IP Restrictions (https://learn.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions) allow you to define a list of IP addresses that are allowed to access your app. The allow list can include individual IP addresses or a range of IP addresses defined by a subnet mask. When a request to the app is generated from a client, the IP address is evaluated against the allow list. If the IP address is not in the list, the app replies with an HTTP 403 status code.
You can use IP and Domain Restrictions to control the set of IP addresses, and address ranges, that are either allowed or denied access to in your websites. With Azure WebApps you can enable/disable the feature, as well as customize its behavior, using web.config files located in their website.
Additionally, VNET Integration gives your web app access to resources in your virtual network but does not grant private access to your web app from the virtual network. Private site access is only available with an ASE configured with an Internal Load Balancer (ILB).
If you haven’t checked this already, checkout Integrate your app with an Azure Virtual Network for more details on VNET Integration (https://learn.microsoft.com/en-us/azure/app-service/web-sites-integrate-with-vnet)
I strongly suggest dropping the whole what's my IP approach and throwing in OAuth. Azure AD gives you access tokens with moderate effort —
Service to service calls using client credentials (shared secret or certificate)
Else, TLS client authentication would be next on my list. Although that tends to really suck if you have to deal with several programming stacks, TLS offloaders and what not.