We are using Azure Web APP for for our FrontEnd site. Recently we have discovered DOS attack on our website. When I googled around I got to know solution for Azure Cloud Services. Is there any way, Azure Web APP can be protected with out of box support..
Azure Web Sites enabled the Dynamic IP Restrictions module for IIS8.You can protect your Azure Web App from DDOS Attacks by configuring Dynamic Ip Security under System.WebServer in your App's web.config file as follows.
<security>
<dynamicIpSecurity denyAction="NotFound">
<!--<denyByConcurrentRequests enabled="true" maxConcurrentRequests="20" />-->
<denyByRequestRate enabled="true" maxRequests="20" requestIntervalInMilliseconds="5000"/>
</dynamicIpSecurity>
</security>
Read Reference For More Information
https://azure.microsoft.com/fr-fr/blog/confirming-dynamic-ip-address-restrictions-in-windows-azure-web-sites/
Related
I am trying to deploy an Azure App Service from Visual Studio 15.2. Specifically I am trying to deploy this following service: https://github.com/Microsoft/Azure-SQL-DB-auditing-OMS-integration to ingest audit logs from SQL Data Warehouse to OMS. However, due to security concerns, we would like to do so without creating a public endpoint, a url. We have tried configuring it in a VNet but it does not allow you to do so unless the VNet has a public gateway.
Configure Azure App Service without public URL
As far as I know, we couldn't configure Azure App Service without public URL. If you created a web app, it will auto provide public endpoint for user to access.
Here are two work around.
I found the github application just use the web app's webjobs.
One way:
If you don't need any web site, just use the backgourd process to run the webjobs, you could choose azure function which uses WebJobs SDK itself but doesn't require an App Service to be configured for it.
Second way:
Normally we run WebJobs in a Azure App Service web app, and that Azure App Service web app can be accessed/browsed via URL. If you want to prevent users from browsing to that Azure App Service web app, you can add a rewrite rule to site’s web.config to block web access.
The web.config is like this:
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
https://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="Block unauthorized traffic to staging sites" stopProcessing="true">
<match url=".*" />
<conditions>
<!-- Enter your staging site host name here as the pattern-->
<add input="{HTTP_HOST}" pattern=".*" />
<!-- Enter your white listed IP addresses -->
<add input="{REMOTE_ADDR}" pattern="123\.123\.123\.1" negate="true"/>
<!-- Add the white listed IP addresses with a new condition as seen below -->
<!-- <add input="{REMOTE_ADDR}" pattern="123\.123\.123\.2" negate="true"/> -->
</conditions>
<action type="CustomResponse" statusCode="403" statusReason="Forbidden"
statusDescription="Site is not accessible" />
</rule>
</rules>
</rewrite>
</system.webServer>
</configuration>
More details about how to add the web.config to your web app, you could follow this steps:
1.Open kudu tool in web portal.
2.Open cmd console and locate the \site\wwwroot folder.
3.Create web.config and copy the settings in it.
4.When we accessed the web site, you could find this:
I have a web app running a old ASMX service that I want to limit access to for only other apps and services within my azure environment.
Is there any easy and cheap way to do this?
App Service Environments seems like it does this, but they seem rather expensive for this small purpose. I would be cheaper with a VM that I can configure the firewall on.
If you know the IP-Ranges you can use web.config file in root of your app:
<security>
<ipSecurity allowUnlisted="false"> <!-- this line blocks everybody, except those listed below -->
<clear/> <!-- removes all upstream restrictions -->
<add ipAddress="127.0.0.1" allowed="true"/> <!-- allow requests from the local machine -->
<add ipAddress="81.116.19.53" allowed="true"/> <!-- allow the specific IP of 81.116.19.53 -->
</ipSecurity>
</security>
I am attempting to host multiple websites in a single Azure WebApp rather than having multiple web apps each hosting a site. Each of these sites is rather small, but in order to meet the requirements of the SLA with Azure, we need to have the server scaled with more than one instance for our Production environment, thus the reasoning for combining sites.
After researching this topic, I have got the following setup with our Azure account.
Created the proper CNAME DNS records in our zone manager (complete and works).
Setup the Azure WebApp to respond to the subdomains (complete and works).
Setup a virtual directory for the second web application (complete and works)
At this point, both web applications function correctly and both subdomains are pointing at our Azure instance. We now have the following setup:
both www.mydomain.com and app.mydomain.com bring up the root application that I deployed.
going to www.mydomain.com/app2 and app.mydomain.com/app2 bring up the second application that I deployed to the virtual directory
What I would like to achieve:
Going to app.mydomain.com would bring up the application in the virtual directory.
Going to www.mydomain.com would bring up the application at the root of the azure instance.
However, what I cannot figure out is how to map a subdomain to a specific virtual directory. I have tried to update the Site URL to be the subdomain I want the application to respond to, however, the subdomain still brings up whatever I have in the root of the WebApp deployment.
Should I have some HttpHandler that sits in the site root and directs traffic to the proper virtual directory? Is there a setting in the portal that I am missing? Previously, we did this with Web Roles and tinkering with the ServiceDefinition file, but the tool sets for the Azure Web Apps in regards to publishing, integration with Source Control, etc seem to be a bit further along.
The answer posted by RuslanY will work (with some modifications to the rules slightly) however, after understanding more of the Azure portal and Web App configurations, it is not needed to host multiple sites within a single Web App (Its technically multiple web apps all sharing the resource plan you define, such as 2 instances of Standard Level 0 (S0))*.
As of today's Azure service offerings, the following is true. When you create a new Web App, you pecify the "App Service Plan" that the app falls into. If you have an App Service plan, lets say Standard with 2 instances, any Web App you deploy to that App Service plan shares those resources with other web apps in the same service plan, meaning you are not paying additional costs to host the additional web app if it is in the same App Service plan. I had assumed each web app was its own set of resources (it can be, but doesn't have to be). Given this, to accomplish what I need, I simply create a web app for each sub domain and place them all into the same App Service plan. I now am hosting multiple sites, not paying for 2 servers per site (what I wanted to avoid) and I don't have to use URL rewrites or HTTP Handlers.
I hope this write-up helps others understand the structure of the Azure Web Apps a little bit better. The current online documentation, from what I can tell, doesn't make this exactly clear.
This may be possible to do with URL rewrite rule which takes the hostname of the request and rewrites the request URL to start with the subdomain extracted from the hostname:
<system.webServer>
<rewrite>
<rules>
<rule name="Rewrite Subdomain To Directory">
<match url=".*" />
<conditions>
<add input="{HTTP_HOST}" pattern="^www\.mydomain\.com$" negate="true" />
<add input="{HTTP_HOST}" pattern="^(.+)\.mydomain.\com$" />
</conditions>
<action type="Rewrite" url="{C:1}/{R:0}" />
</rule>
</rules>
</rewrite>
</system.webServer>
To understand the syntax of the rewrite rules you can refer to the IIS.net documentation about URL rewrite module.
I need to make a web api internal to Azure cloud. What attributes or setting to make?
setup
I have two application deployed in azure cloud.
1st is a frontend MVC5 application with UI.
The 2nd is a WebAPI.
The user external to cloud can make calls only to 1st application.
The 1st application calls the 2nd appliction internal to cloud.
i don't what users external to cloud make calls to 2nd application.
How do i restrict it?
The 1st application is a website deployed in cloud. Second application is also a MVC5 website with only WebAPIs deployed in cloud.
Thanks in advance.
Since Azure Web Sites don't support virtual networks yet, what you can do is configure IP restriction.
Place this section in your Web.config file and replace the IP address with the MVC5 address.
<security>
<ipSecurity allowUnlisted="false"> <!-- block everybody, except those listed below -->
<add ipAddress="999.999.999.999" allowed="true"/> <!-- allow requests from the MVC5 app -->
</ipSecurity>
</security>
One caveat is that all Web Sites from the same Azure region are sharing the same IP address. To get around this, you need to configure SSL as described here: http://blogs.msdn.com/b/benjaminperkins/archive/2014/05/05/how-to-get-a-static-ip-address-for-your-microsoft-azure-web-site.aspx
I have a web application that is hosted by azure as a web role. The application is installed on two sub domains, QA and Production, the QA environment has the X-Frame-Options set to deny, but the production environment does not.
Currently the same code is deployed to each environment, so it must be a configuration option. I can't find anywhere in the web app where the XFO headers are set. Where else might the configuration be set?
I know this is old but still no answer so...
You can set it in the web.config like this:
<customHeaders>
<clear/>
<add name="X-Frame-Options" value="ALLOW-FROM youruri" />
</customHeaders>