Good evening,
I currently have deployed a VPN in azure, in this network I have added a cloud service and have also granted access to an azure website, so far so good.
Now I want the cloud service to be available only to the nodes of my VPN, especially the azure website. In order to achieve this I have created some ACLs which grant access to every node of my subnet i.e,
<Rule action="permit" description="test2" order="200" remoteSubnet="172.16.0.0/27" />
However, once the ACL Rule is enforced, the website has no access to the cloud service and therefor a timeout exception is thrown. Am I doing something wrong or the only way to achieve this is to deploy both of my projects on cloud services instead of a website and a cloud service? It is vital for this project that the cloud service is only available locally.
Thanks in advance
You can't currently restrict Azure Websites to only be accessible via a private VNet and as you suggested you will need to use either Web Role (Cloud Service) or a VM.
Related
I have an Azure Web App and an Azure SQL Server, both in the same subscription. Both of them are connected to the same VNet Subnet as shown in the below snapshots. The SQL Server is configured not to Allow Azure Resources and Services to access the server, as it should only permit access from either the connected subnet or a set of IP rules.
Unfortunately, the SQL Server is actively refusing any connection from the web app stating that the web app IP is not allowed to access the server.
The interesting thing is that I have the exact same configuration working on another subscription.
What could I be missing?
Snapshots:
1- Here you can see the web application connected to the "webapps" subnet
2- And here you can see the SQL Server connected to the same subnet
3- And that's the error I get
TLDR
The configuration is correct, but an app service restart may be required.
VNET Integration
The configuration of using a virtual network to connect a web app to a SQL database is correct: if the web app is connected to the same subnet/vnet which is allowed in the database's ACLs, and the Microsoft.Sql service endpoint is enabled on the subnet, the web app is able to communicate to the database. This is the whole reason for service endpoints: you do not need to configure with IP allowances on the database.
As to why the configuration still resulted in an error, it could be the order in which the resources were configured. We were experiencing the exact same setup and issue (which is what let me to this question)!
We connected our web app to the subnet/vnet but had not enabled the service endpoint on the subnet. We then added/allowed the subnet/vnet as an ACL in the database, during which we were prompted to enable the Microsoft.Sql service endpoint (we did). However, even after waiting ~20 minutes, we were still seeing the same connection issue.
However, once we restarted the app service, the issue went away and the web app could connect to the SQL database.
I suspect the issue is due to enabling the subnet's service endpoint after the app service was connected to the subnet. The app service must need a restart to refresh the app service's vnet config/routing.
Configuration NOT needed
Contrary to other answers, you do not need to configure firewall IP allowances nor enable access to Azure services and resources. In fact, there are downsides to both approaches:
Enabling access to Azure services and resources allows any Azure-based resource to connect to your database, which includes resources not owned by you. From doc:
This option configures the firewall to allow all connections from Azure, including connections from the subscriptions of other customers.
Unless you're using an App Service Environment (which is significantly more expensive than normal App Service plans), your web app's outbound IP addresses are neither static nor specific to your application. From doc:
Azure App Service is a multi-tenant service, except for App Service Environments. Apps that are not in an App Service environment (not in the Isolated tier) share network infrastructure with other apps. As a result, the inbound and outbound IP addresses of an app can be different, and can even change in certain situations.
The second point is further elaborated upon in this Github issue:
IPs are indeed shared with other App Service plans (including other customer's plans) that are deployed into the same shared webspace. The network resources are shared among the plans in a workspace even if the computing instances are dedicated (e.g. in Standard tier). This is inherent to the App Service multi-tenant model. The only way to have a dedicated webspace (i.e. outbound IPs) is to deploy an App Service plan into an App Service Environment (ASE) (i.e. Isolated tier). ASE is the only thing that offers true single-tenency in App Service.
So neither of the above options will truly harden your SQL database if you want to isolate communication from only your web app. If you have resources in the same subnet, using vnet integration is the correct way to solve the problem.
If resources cannot be in the same subnet, the solution is to use Private Endpoints.
Virtual networking in Azure is quite different from how it would work on premises.
I had similar problems in production environment and digging deep, the working solution (meeting security standards and create a secure connection to the database) was to create a private endpoint for SQL access in the virtual network. Then all the calls to the SQL were performed internally (it did not go on the internet), and the databases were denying all public calls.
In your case now, you deactivated the Allow Azure apps to access so when your app is trying to access the SQL the server checks the ip to find out if it is white listed or not. So fast solutions would be one of the following:
Enable Azure Web apps to access SQL
Find all outbound IPs of your web app and register them in you SQL firewall/ security settings.
If you talk about a proper production environment with security regulations I would suggest you go down the more tedious path of private endpoints.
You have to configure the outbound IPs from the app service in the sql fw.
You can find them under properties of your app service. Documentation.
The reason why is that the VNET integration doesn't give your app service an outbound IP in the VNET you configured it in, so the FW you configured doesn't work.
I have working web apps which access storage accounts and KVs. These storage accounts and KVs accept traffic from a particular subnet and the web apps have been configured to integrate with those subnets. I did face an issue where even after integration apps were not able to access these resources. What worked for me was, I changed the App service SKU from Standard to Premium and restarted the app. As you can see, it warns that "Outgoing IPs of your app might change". This is not guaranteed solution but it worked for me.. several times! Not sure about SQL server though. Private endpoint does seem like the way to go but you can give this a try.
I have an Azure App Service where the customer is using an Akamai WAF in front of it to connect to it. Now I have the requirement that the App Service should not be reachable other then through that WAF. I got a list of IPs I have entered in the App Service Networking in the Access Restrictions list (App Service -> Networking -> Access restrictions).
This works pretty well in principle, but if I now try to access the service directly (so by using appname.azurewebsites.net), not through the WAF, it will return a 403 error response. But the requirement is that the service should not answer, at all.
Is there a way to achieve that in Azure? What would be the best way to do this?
By default, when you configure ip restrinctions on App Services, the App Service will return the 403 forbidden page from Azure.
So, if you want to Avoid default 403 when IP Restrinctions are configured on App Services, you could vote up this feedback to promote this to be achieved.
There is a way to achieve this behaviour right now in an app service:
What you need to do is use an app service plan on the Isolation tier, create a v-net and add a network security group to it where you can restrict inbound ips.
This is pretty expensive, but currently the only way.
What I ended up with is to use a VM with a v-net, as this is much cheaper. An App service on the isolation tier unfortunatly would have destroyed the budget.
I have website deployed on Azure App Service and I want to restrict access to my website from any other country accessing it but only a specific country can access that website.
Is there any way where I can restrict/allow at the infrastructure level inside Azure?
Even though AppService does not provide, Yes this can be done with Azure CDN provider does via the Geo Level Filtering. More details can be found here.
Is there any way where I can restrict/allow at the infrastructure level inside Azure?
Agree with Sajeetharan. It seems Azure Web App could not restrict the access just by country directly. You can have a try with Azure CDN, it can restrict the access by country.
But, as the comment you said, you do not have to restrict CDN, in this case, you can consider to restrict IP addressees in Azure. You can also use IP Restrictions menu in Azure app services to add restrictions:
You can check the document Azure App Service Access Restrictions for some more details.
Besides, you can try to use web.config or use IP restrictions feature of the webapp:
Check this thread for some more info.
Hope this helps.
Answer is: Azure Front Door with Front Door WAF policy
After going through with different Microsoft documentation I finally implemented the solution with Azure Front Door where you can set Frontend hosts and Backend pools with forwarding/redirecting. And in Frontend hosts, you can select WAF policy.
In the backend pool, you can select any application e.g. App Service or any IP where your app is deployed.
In WAF policy there are multiple options to restrict your traffic and one of them is geolocation restriction.
Just apply geolocation restriction according to your desired country and it will work like a charm.
I am planning on using an outsourcing team for data processing and want to avoid them downloading or storing client data on their local machines. To facilitate this, I want to create an Azure VM in which they can do all their work (msoft office, etc.) and access an ASP MVC app hosted as an app service in Azure. The MVC app is integrated with the corporate AD and for the outsourcing logins I want to see if the request is coming from my VM or the internet (the latter gets denied). So far I have:
Created a ASP MVC5 app and an Azure VM
Connected the two via VPN (point to site)
When I attempt to go to the public URL for the website on the VM, I get the "this page can't be displayed" thing, which leads me to believe I'm on the right track (now I have to update the hostfile of the machine to the private IP of the mvc app service app?). How do I do the following:
Connect to the app service via web browser (this needs to be over the vnet so that I can pick and choose in the app code who can login outside the network)
Get the network ip of the app service so I can update the VM hostfile
Am I on the right track here? Thanks in advance!
Your understanding of Azure App service is not accurate. Azure App service cannot be accessed via a private IP. They already sit inside a private vnet. They can be only accessed via public hostname with a common DNS name (azurewebsites.net)
Your scenario requires the Azure Web app and the VM to reside in the same VNET, which is not possible. There is another offering called ILB ASE, which allows you to do this. But it's a more elaborate setup. See this for more information: Using ILB with AN ASE
In your scenario you can restrict access to the web app via IP Restrictions module. See this article: IP & Domain Restrictions in Azure App Service
I understand this not the solution u wanted. What you want can be achieved via ILB ASE, but that is an expensive and elaborate set-up.
HTH
you may want to try using cloud service, though MS recommends App Service, you requirement doesn't fit into App service..
Official documentation from MS: https://learn.microsoft.com/en-us/azure/cloud-services/cloud-services-startup-tasks-common
Block a specific IP address
You can restrict an Azure web role access to a set of specified IP addresses by modifying your IIS web.config file. You also need to use a command file which unlocks the ipSecurity section of the ApplicationHost.config file.
Given:
Couple of websites created using Azure Web Sites execution model.
No RDP access since Azure Web Sites doesn't provide it.
Possibility to install/create Cloud Service on Azure. Cloud Service
does have RDP access to its websites.
Question:
Will it be possible to access the existing websites via RDP on Cloud Service?
Assuming you had deployed your sites in Azure Cloud Services and enabled RD, you can very well look at the setup and config of your site(s) under it.
However if you make any changes, it may not be reflected to the setup as the Azure Cloud Services is non persistent and during any Data center activities like load balancing the fabric controller may just pull of your instance and re-deploy in someother instance. During this process all your changes will be lost and the original package of cscsf and cscfg will utilized during deployment.