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.
Related
We have a number of test/uat app services and websites running on app services. We currently restrict access via IP address by adding the IP address to the firewall.
This worked fine when it was mostly developers with static IP addresses but now we have suppliers and customers accessing the UAT systems from various places including home. It's a pain to maintain the IP addresses.
Ideally, I would like to be able to setup users in Azure and give them access to the various test system via this user.
Is there anyway to do something similar or is there a better approach.
Thanks.
You can use Azure App Registrations with a client secret and then use the client credentials flow to obtain access. This is probably the easiest way.
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.
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
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.
Background:
I'm hosting 2 separate Website instances - 1 for a WebAPI2 "API", and 1 as an MVC5 "Client" that consumes said API. I would like to restrict access for the "API" to the "Client" (there are multiple clients)
(I've only seen answers for Cloud Services or VMs, so wanted to ask if there was anything I could use for Websites. I don't want to use a cloud service or a VM, as the website is faster, lighter, cheaper - which is what I need.... could not find a firewall feature for Websites in Azure.)
Problem:
I believe I can limit access to the "API" by setting parameters in the project's Web.Config file.
But nslookup in the command prompt yields the same IP Address for all azure websites under my account.
Question:
How do I find the right IP Address -- one that the "Client" website will use to access the "API" Website instance?
If there is a better way to restrict access...please do suggest it.
You cannot secure your site by IP ACLing as web sites in Azure are running in a multi-tenant environment and they share set of IP addresses (IP addresses are per DC).
You need to rely on different security mechanisms (using some secret which only client/server know etc.).
Hope that helps.
You can also take a look at How to determine Azure website outgoing IP Address?
Petr