I'm trying to secure my containerized web app with a Premium V2 App Service Plan. I've enabled Service Endpoints for an integration subnet for the different App Services to restrict incoming traffic from each other except for the frontend (so all of them are integrated with the VNet and all have incoming traffic restricted to that VNet except for the frontend).
I have also other Azure services like Azure Functions or a Storage Account that can have inbound traffic restricted by using those Service Endpoints. However, One of the App Services calls an external 3rd party API that lies on Azure too. That API may or not be behind a static IP. However, it has a Custom Domain associated.
The problem arises when I try to connect to that API from one of the VNet integrated App Services. As the destination IP is inside one of the IP ranges that are added to the routing with the use of a Service Endpoint, traffic is sent via that Service Endpoint instead of simple Azure routing. I've tried overriding the route with a Route Table associated to that subnet but that seems not to be possible, with or without a NAT Gateway attached to the subnet. I guess Azure routing is prioritized here. I'm sure the route is not effective as I used it on a different subnet where I deployed a VM.
Is there any way I can use that Service Endpoint for my internal traffic only so it's not used when it goes to an Azure hosted API or I need to switch to a different approach like Private Endpoints or an ASE?
I am unsure what you're looking for but if you want to explicitly define routes you should try using app services setting "WEBSITE_VNET_ROUTE_ALL" = 1 which overrides the default precedence of routing and makes sure that every outbound call follows the route defined inside route table of subnet.
Use the following steps to add the WEBSITE_VNET_ROUTE_ALL setting in your app:
Go to the Configuration UI in your app portal. Select New application setting.
Enter WEBSITE_VNET_ROUTE_ALL in the Name box, and enter 1 in the Value box.
When WEBSITE_VNET_ROUTE_ALL is set to 1, outbound traffic is still sent from the addresses that are listed in your app properties, unless you provide routes that direct the traffic elsewhere.
We've been able to ask the 3rd party to disable blocking rules. It turns out they had a rule that blocked this specific traffic.
I already tried changing that setting, but didn't try putting a route table on it. However, it'd make no difference as I can't define a list of allowed outbound IPs belonging to Azure since we have no static IP to call.
Related
I have a logic app sitting in an internal ase which is also sitting behind an azure app gateway. The logic app does not automatically "fetch" via the run trigger I assume due to some traffic constraints utilizing the office365 api connection on an internal ase. The Logic App has a "when a new email arrives" trigger based on a specific subject line but this never triggers. Is the best way to accomplish this is to utilize a NSG to allow inbound/outbound traffic to the various list of ip address etc for Office365? Are there any pre-existing service tags I can use on the NSG?
As per document, you can use services tags in network security group. As you are using logic app which is on internal ASE, need to add inbound and output security rules as mentioned in the above document.
Add outbound rule as shown in below image,
Add inbound rule also as shown in below pic,
Reference link
I have 2 app service plans in the same Azure region running 1 app each - web frontend on one, API on the other.
I want to use access restrictions on the API to only allow access from the front end app.
I set access restriction rules using all the outgoing IP addresses associated with the frontend app (I note that these are exactly the same as the outgoing IP addresses on the API app as well) however when the frontend app tries to contact the API I get an error:
403 forbidden 'The web app you have attempted to reach has blocked your access.'
The 2 apps can communicate as normal when the access restrictions are removed.
I turned on diagnostic settings and ran a query on IP blocking by the app.
Turns out that the FE app is using an IPv6 address instead of the v4 addresses listed in the app properties.
This is because the app has a vnet integration set up connecting to a Subnet delegated to Webservice/serverfarm.
Azure does not make it obvious that using delegated subnets forces an integrated app to use IPv6 and there does not appear to be a way to discover what v6 addresses may be in use. MS forum response suggests any firewall rule for a web app attached to a delegated subnet should allow ALL IPv6 addresses (!!) as a way of working around the problem.
https://learn.microsoft.com/en-us/answers/questions/493483/why-is-my-azure-web-app-showing-an-ipv6-outbound-i.html
You can control the IP address of outbound traffic from your FE web app by using regional VNet integration together with a virtual network NAT gateway to direct traffic through a static public IP address. Regional VNet integration is available on Standard, Premium, PremiumV2 and PremiumV3 App Service plans. To learn more about this setup, see NAT gateway integration.
Once you FE web app has a static IP you can use that on the API web app restriction in an ALLOW rule.
If your requirement fits, you may also leverage Service Endpoints.
With service endpoints,to ensure inbound traffic to your API app comes only from the subnet used by your front-end web app.
With this route, you need to use VNet Integration with your front end app and service endpoints with your API app. Set service endpoints on the integration subnet used by your Front End application. This solution is fast to set up and easy as well.
-This feature works together with IP access restrictions. Service endpoints aren't compatible with remote debugging. There are some considerations you need to make, you may take a look at them here and also other combination of networking features available on App Service and related scenarios.
As a side note:
-IP-based access restriction rules only handle virtual network address ranges when your app is in an App Service Environment. If your app is in the multitenant service, you need to use service endpoints to restrict traffic to select subnets in your virtual network.
-On App Service, you could have those two separate apps in the same App Service Plan (ASP), since you pay only for ASP, saving costs.
So, you can continue to add apps to an existing plan as long as the plan has enough resources to handle the load. The apps in the same App Service plan all share the same compute resource.
My application is making HTTP requests to a 3rd party API which has an IP whitelist.
Of course, I could add the IP addresses assigned when the Web App is created but test environments are created and destroyed on demand, meaning we need to request an update the whitelist.
My thoughts are to attached the Web App to an existing VNet and assign a NAT to specify the outbound IP. Will that work?
According to the official document, the example operation can be completed, WEBSITE_VNET_ROUTE_ALL needs to be configured, and you need to pay attention to WEBSITE_VNET_ROUTE_ALL is currently not supported in Windows containers.
I have azure app service which runs .net core web api. This api access several external API s to get data and those external services has to whitelist the outbound ip addresses of my app service.
Azure app service has several outbound ip addresses and it can be change when upgrade/downgrade app service or when make internal changes like changing app service plan or resource group.
Is there any solution in azure to setup this app service behind a forward proxy ?, so i can share the IP of the forward proxy to external parties.
I think the best way would be to add all App services under a virtual network and create a Virtual Network Gateway to all outbound connections.
This would potentially need below azure services to be created:
- Virtual network
- Subnet
- Virtual Network gateway
- Routing tables (to route traffic via Gateway)
A better way would be sharing a domain name rather than IP address. Here's how to configure it directly in the Azure Portal:
https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain
You can also add an API Management in front of your web app and use it as API gateway and also apply policies on it.
https://learn.microsoft.com/en-us/azure/api-management/configure-custom-domain
I'm struggling with how to use Azure API management together with App Service Environment v1 (aka ASEv1), i.e. how to set the things via Azure portal.
I have ASE with one app service (target is several of them) and I have APIM gateway pointing to the public host name of the service.
What I have to do to make the app services in ASE VNet to be accessible only through the APIM gateway, to keep the back-end services hidden?
I need to be able to manage APIM from Azure portal and to be able to access the services directly via FTPS for deployment, collecting logs, etc.
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I've created a new subnet for the APIM and put it in the ASE VNet , where already ASE subnet was. Now I probably have to set some NSG rules but I'm not sure how and if it is all I'm supposed to do.
The second thing I'm not sure is how to change the APIM API settings. It now points to a public URL of the service - I do not know if it will be available after NSG changes.
There are a couple of options, depending on what you really want. If you're fine having your backend services visible by outside but not callable, you can employ any means of authentication between APIM and backend services:
Shared secret - header/query param
Client certificate authentication
IP filtering on the side of backend services
If you want to really hide backend services from outside, you'll have to put APIM and ASE into same VNET.
Following seems to work, although it may need some fine tuning.
In short, each layer put into separate external VNet with own Network Security Group (NSG), using caller's public IP address to manage access to VNet:
back-end service web app in ASEv1 VNet "vnet-ase", with associated NSG "nsg-ase"
APIM gateway put to a separate VNET "vnet-apim", with associated NSG "nsg-apim"
in nsg-ase allow access from public IP of APIM GW, to vnet-ase
nsg-apim will be used to manage connections to the APIM gateway