Problem
I have an App Service that is unable to access (unauthorized storage exception) a storage account.
Both of these resources are in the same Resource Group (i.e. Resource Group XYZ).
The storage account has its Networking "Allow access from" to "Selected Networks". From here I configured a Virtual Network, and also include all the outbound IP Addresses under the Firewall section.
Note that if I set the Networking "Allow access from" to "All Networks", then everything works fine.
My Suspicion
I noticed that my app service is NOT on the Virtual Network that is the storage account is configured with. I am unable to add the vnet (under the app's Networking blade) due to some error - which I suspect is due to the fact that the app service is under an App Service Plan which is associated with a different resource group (i.e. Resource Group ABC).
Question(s)
Any ideas what could be the culprit to the storage account access issue?
Again, I suspect it could be related to the App Service Plan being in a different resource group - in which case, it is a different issue altogether (i am unable to see my other App Service Plans under the "Change App Service Plan" blade).
The are 2 things to take into consideration:
That your app service can reach the storage account.
This depends on how locked down your storage account is. If is only allows access from the Vnet that it is on, then you need to add your app service to the same vnet
You need minimum Standard app service plan for network integration. The app service must also be in the same region as the vnet.
Your app service is allowed to access the storage account.
You can either do this using a Managed identity or a Shared Access Signature. See this link for using managed identity: https://learn.microsoft.com/en-us/azure/app-service/scenario-secure-app-access-storage?tabs=azure-portal%2Ccommand-line
Related
We have a .Net application, running in a docker container, connecting to Azure Storage, running on Azure AKS. We use the connectionString to connect to the Azure Storage, for both temporary file storage, as well as logging purposes. Our AKS sits within a vNet, with it's own subnet, and it happily connects to the storage, which also sits in its own subnet, with the two subnets linked via a service endpoint. The storage is not open to all networks, it's been set to only be enabled from selected virtual networks and IP addresses.
Now, if we try and move / run the container on the AKS virtual node, it's starts up amd runs without any issues, but if we try and hit the storage from within the container, we now have authorization issues:
Status: 403 (This request is not authorized to perform this
operation.) ErrorCode: AuthorizationFailure
Content: AuthorizationFailureThis
request is not authorized to perform this operation.
RequestId:131fd452-901e-001a-4329-f3010f000000
Time:2022-11-08T04:23:09.0663031Z
If I enable the storage to have public network access, it works, but we don't want this. So what our options to fix this seeing as we can't add a service endpoint to the underlying subnet / vNet on which the virtual node is running. We're also concerned, because this will probably affect any db connections as well, which will be an issue if we want to run our db backed containers on the virtual node.
Status: 403 (This request is not authorized to perform this operation.) ErrorCode: AuthorizationFailure
Content: AuthorizationFailureThis request is not authorized to perform this operation.
The above 403 errors occur you may not give proper permission and also you may not assign roles in storage account.
For principal authentication purpose you need to assign roles in your storage account.
Storage blob data owner
Storage blob data contributor.
Portal:
In portal go to your storage account -> Access Control (IAM) -> Add ->Add role assignments-> Storage blob data owner or Storage blob data contributor with your service principal.
After assigning it you can view the access through portal by referring below snap:
Make sure with Networking and Firewalls and virtual networks in the public access is set to Enabled from selected virtual networks and IP addresses.
Make sure you were adding correct virtual network and subnets in the portal and also virtual node client IP address in your environment issue may client IP was not added to the firewall rules for the storage account and also check the Allow Azure services on the trusted services list to access this storage account. in Checked state, Then, these trusted providers will establish a secure connection to your storage account using strong authentication.
Go to Azure Portal -> Storage Accounts -> Networking-> Enabled from selected virtual networks and IP addresses.
Reference:
Creating Azure Storage Containers in a storage account with network rules, with Terraform by Ansuman Bal
We have an Azure Storage Account that we need to access from our company but it also needs to be accessible to one of our web apps in the same Resource group. This app is only visible to our company and some other apps that use some parts of it.
So the path looks something like this:
Storage account (Secured for App1 and our company) <= App1 (Secured for Other Apps and our company) <= Other apps (Publicly available)
My question is: How to secure/setup the storage account so the App1 can use it but it is still only available to our company without using VNET?
Currently there is only the exception for our company on the storage account. And the "Allow Azure services on the trusted services list to access this storage account." setting allowed which I read on some Technet thread that it should allow the access of resources in the same subscripition to the storage account which it unfortunatelly doesnt as Web Apps dont seem to be on the trusted list for some reason.
The App1 is .NET Framowork 4.8 connecting to the storage in the account via conenction string and is using a container inside it. When the Networking security is disabled everything is working properly.
So far I have tried the following:
Allowing all the outbound address of App1 on the storage account FW
Giving App1 an Identity and assigning it with the Storage Blob Data Contributor role on Subscription lvl per this manual https://learn.microsoft.com/en-us/azure/app-service/scenario-secure-app-access-storage?tabs=azure-portal%2Cprogramming-language-csharp
Is there any option that could do the trick before we start messing with VNETs which should work?
How to secure/setup the storage account so the App1 can use it but it
is still only available to our company without using VNET?
You can integrate your web app with VNET so that the web app can access the resources in the Virtual Network
Go to your Web App in the portal --> Select networking --> In the outbound traffic, select VNET integration --> Add your VNET and the subnets
Now go to your Storage Account --> Select Networking --> Under the selected networks, click on Add existing virtual network --> Add your virtual network and the subnets
Now, you would be able to access the storage account from your web app.
I have an Azure App Service which uses Blob Storage to host it's static files. For this particular app (staging environment) we only want to allow access from the app service and a specific set of ip addresses.
What is the best way to go about this? I tried providing an identity for the app service with the role of Owner but it keeps getting a 403 when trying to access blob storage.
I can reproduce your problem:
Why you still get 403 is because you are missing the necessary steps.
You have two way.
1, add service outbound ip to the firewall of storage.
2, put the app under a virtual network and then allow the VNET to access.
Common solution:
First of all, create a virtual network on azure.
Then add the network to the firewall setting of storage:
After above configuration, my Azure App Service can access the storage with no problem. Please have a try on your side.(Pleace notice that VNET configuration will not work immediately, you need wait for a little time.)
I am currently working with a client that requires access to all Azure resource locking down as much as possible and I am having problems with the Storage Account that is utilised by our Azure Functions.
With the Firewalls and Virtual Networks blade in portal set to "All Networks" I am able to deploy to the Function App and it runs without issue.
However once I enable the access restriction by checking "Selected Networks"no matter what virtual network subnets I enter or IP Addresses I can not get the communication to work
I have entered the Outbound IP Addresses of our Consumption based Function App and also check that the additional IP Addresses from the Powershell and all have been added to the whitelist. I have also added all the CIDR IP ranges of the local Azure datacenter but again it does not work.
The problem we have is that once the access restrictions have been put into place we are unable to deploy to the Function App and the app no longer runs. Is this scenario supported and what is the mechanism for tying down access to the Storage Account so that only the Function App can utilise it.
As far as I know, you have two options to restrict access to your storage account from your function app or web app.
Whitelist the outboundIpAddresses and possibleOutboundIpAddresses of the function app in the firewall of the storage account. However, it does not work if the Azure function app and Azure storage located in the same region refer to Sam's answer.
when you hit the storage account from your function, because they are
in the same region as each other, all the traffic goes over the
internal Azure network on internal IP's, not the public IPs listed in
the web app, and so is not allowed over the firewall.
If your resources were in different regions, you could use the network section of function app to allow function app to access resources in a VNet, then enable service endpoint for Microsoft.Storage in this app integration subnet. But you need Azure Functions Premium plan referring to this tutorial: integrate Functions with an Azure virtual network.
Sometimes, the deployment order for networking is important. In this case, you will deploy the followings:
Firstly, you could deploy new VNet integration with an unused subnet. After the VNet Integration is completed and the function app is restarted, you could enable service endpoint for this subnet. In the end, you could add the subnet in the firewall of the storage account.
Note that the new version is in Preview, currently. You could also check these characteristics and get more references from this thread.
Originally I tried to restrict access from an app service to blob storage using IP addresses, however it turned out that you can only do this using a Virtual Network: Firewall access from Azure app service to blob storage
I want to be able to achieve this without setting up a point-to-site VPN. The steps I have taken to set up a virtual network in Azure are as follows:
Created Network security group "securitygroup-frontend", add custom
inbound rule called Web with Source: Service Tag, Source service tag:
Internet, Source port ranges: *, Destination : Any, Destination port
ranges: 80, 443, Protocol: Any, Action: Allow, Priority: 100
Created Virtual Network with address space 192.168.0.0/23 and subnet called frontend address range 192.168.0.0/26 with network security group: securitygroup-frontend and subnet delegation to Microsoft.Web/serverFarms and service endpoints Microsoft.Storage
Went to app service -> Networking -> Configure VNet integration ->
Add VNet preview and select the subnet you created
Went to Storage -> Firewalls and virtual Networking -> Configure VNet integration -> Select 'Selected networks' and add in the virtual network and subnet just created.
I have had to move Azure diagnostics and logs such as for key vault, service bus and sql azure to its own blob storage as these require blob storage outside of a virtual network and can't be made to work inside. The app service is in the Standard plan. The app service, blob storage and virtual network are all in the same region.
This question and answer does not provide any insights: https://social.msdn.microsoft.com/Forums/azure/en-US/9f4d8aeb-68a6-4ec1-9e11-bee2d1301792/allow-access-to-azure-storage-account-only-from-an-app-service?forum=windowsazurewebsitespreview
The above steps though block off access from the app service to blob storage and any assets within return an error: (403) Forbidden. If I remove the Virtual network from blob storage it works fine. What am I doing wrong?
Yes, you can do this using a VNet but you need to deploy the web app in a VNet with App Service Environments. You can not do this with VNet integration. Integrating Azure services to an Azure virtual network enables private access to the service from virtual machines or compute resources in the virtual network. However, web app service in a regular app service plan is multi-tenant. With ASE, you could deploy it into your VNet.
You could get more details and explanation from this similar thread. According to a comment from silent, you could also consider deploying your web app inside a container which could be deployed in a VNet with some restriction.
Update
Sometimes, the deployment order for networking is important. In your case, you enable service endpoint before VNet integration. I suggest removing NSG restriction in integrated app subnet VNet for a test. Then you could check the following steps.
Firstly, you could deploy new VNet integration with an unused subnet. After the VNet Integration is completed and the web app is restarted, you could enable service endpoint and subnet delegation for this subnet. In the end, you could add the subnet in the firewall of the storage account.
The new version is in Preview and not GA currently. It might be not all functions available. you could also check the following characteristics.
No gateway is required to use the new VNet Integration feature。
You can access resources across ExpressRoute connections without any additional configuration beyond integrating with the ExpressRoute connected VNet.
The app and the VNet must be in the same region.
The new feature requires an unused subnet in your Resource Manager VNet.
Your app must be in an Azure App Service deployment that is capable of scaling up to Premium v2.
Your App Service plan must be a Standard, Premium, or PremiumV2 plan Production workloads are not supported on the new feature while
it is in Preview
The new VNet Integration feature doesn't work for apps in an App Service Environment.
You cannot delete a VNet with an integrated app.
Route tables and global peering are not yet available with the new VNet Integration.
One address is used for each App Service plan instance. Since subnet size cannot be changed after assignment, use a subnet that can
more than cover your maximum scale size. A /27 with 32 addresses is
the recommended size as that would accommodate an App Service plan
that is scaled to 20 instances.
You can consume Service Endpoint secured resources using the new VNet Integration capability. To do so, enable service endpoints on the
subnet used for VNet Integration.