.NET Getting Started with ASM

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You can monitor application security for .NET apps running in Docker, Kubernetes, AWS ECS, and AWS Fargate.

In general, setting up Application Security Monitoring (ASM) involves:

Updating to the latest Datadog library (the most recent APM tracing library).
Enabling the library to collect the application security data from the services and send it to Datadog.
Triggering security signals in your application and seeing how Datadog displays the resulting information.

Prerequisites

The Datadog Agent is installed and configured for your application’s operating system or container, cloud, or virtual environment.
Datadog APM is configured for your application or service, and traces are being received by Datadog.

Get started

Update your Datadog .NET library to at least version 2.2.0, for your target operating system architecture.
For information about which language and framework versions are supported by the library, see Compatibility.

Enable ASM by setting the DD_APPSEC_ENABLED environment variable to true. For example, on Windows self-hosted, run the following PowerShell snippet as part of your application start up script:

$target=[System.EnvironmentVariableTarget]::Process
[System.Environment]::SetEnvironmentVariable("DD_APPSEC_ENABLED","true",$target)

Or one of the following methods, depending on where your application runs:

In a Windows console:

rem Set environment variables
SET CORECLR_ENABLE_PROFILING=1
SET CORECLR_PROFILER={846F5F1C-F9AE-4B07-969E-05C26BC060D8}
SET DD_APPSEC_ENABLED=true

rem Start application
dotnet.exe example.dll

Run the following PowerShell command as administrator to configure the necessary environment variables in the registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment and restart IIS.

$target=[System.EnvironmentVariableTarget]::Machine
[System.Environment]::SetEnvironmentVariable("DD_APPSEC_ENABLED","true",$target)
net stop was /y
net start w3svc

Or, for IIS services exclusively, on WAS and W3SVC with Powershell as an administrator, run:

$appsecPart = "DD_APPSEC_ENABLED=true"
[string[]] $defaultvariable = @("CORECLR_ENABLE_PROFILING=1", "CORECLR_PROFILER={846F5F1C-F9AE-4B07-969E-05C26BC060D8}", $appsecPart)

function Add-AppSec {

    param (
        $path
    )
    $v = (Get-ItemProperty -Path $path).Environment
    If ($v -eq $null) {
        Set-ItemProperty -Path $path -Name "Environment" -Value $defaultvariable
    }
    ElseIf (-not ($v -match $appsecPart)) {
        $v += " " + $appsecPart;
        Set-ItemProperty -Path $path -Name "Environment" -Value $v
    }
}
Add-AppSec -path "HKLM:SYSTEM\CurrentControlSet\Services\WAS\"
Add-AppSec -path "HKLM:SYSTEM\CurrentControlSet\Services\W3SVC\"

net stop was /y
net start w3svc

Or, to avoid editing registry keys, edit the application settings in the web.config file of your application:

<configuration>
  <appSettings>
        <add key="DD_APPSEC_ENABLED" value="true"/>
  </appSettings>
</configuration>

This can also be done at the IIS application pools level in the applicationHost.config file, usually in C:\Windows\System32\inetsrv\config\:

<system.applicationHost>

    <applicationPools>
        <add name="DefaultAppPool">
            <environmentVariables>
                <add name="DD_APPSEC_ENABLED" value="true" />
            </environmentVariables>
            (...)

Add the following to your application configuration:

DD_APPSEC_ENABLED=true

Update your configuration container for APM by adding the following argument in your docker run command:

docker run [...] -e DD_APPSEC_ENABLED=true [...]

Add the following environment variable value to your container Dockerfile:

ENV DD_APPSEC_ENABLED=true

Update your deployment configuration file for APM and add the ASM environment variable:

spec:
  template:
    spec:
      containers:
        - name: <CONTAINER_NAME>
          image: <CONTAINER_IMAGE>/<TAG>
          env:
            - name: DD_APPSEC_ENABLED
              value: "true"

Update your ECS task definition JSON file, by adding this in the environment section:

"environment": [
  ...,
  {
    "name": "DD_APPSEC_ENABLED",
    "value": "true"
  }
]

Add the following line to your container Dockerfile:

ENV DD_APPSEC_ENABLED=true

Restart the application using a full stop and start.
The library collects security data from your application and sends it to the Agent, which sends it to Datadog, where out-of-the-box detection rules flag attacker techniques and potential misconfigurations so you can take steps to remediate.
To see Application Security Monitoring threat detection in action, send known attack patterns to your application. For example, trigger the Security Scanner Detected rule by running a file that contains the following curl script:
```
for ((i=1;i<=200;i++)); 
do
# Target existing service’s routes
curl https://your-application-url/existing-route -A dd-test-scanner-log;
# Target non existing service’s routes
curl https://your-application-url/non-existing-route -A dd-test-scanner-log;
done
```
Note: The dd-test-scanner-log value is supported in the most recent releases.
A few minutes after you enable your application and exercise it, threat information appears in the Application Trace and Signals Explorer in Datadog.

.NET Getting Started with ASM

Prerequisites

Get started

Further Reading