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security-considerations.md

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Security Considerations

Azure Active Directory Authentication (Entra ID)

Configuration

Prior to 9.0 RC 2, the TenantId configuration option is optional. However when configuring dotnet-monitor, TenantId should always be explicitly set to your tenant's id and not a pseudo tenant (e.g. common or organizations).

Token Validation

When using Azure Active Directory for authentication, the following noteworthy properties on a token will be validated:

  • aud will be validated using the AppIdUri configuration option.
  • iss will be validated using the TenantId configuration option.
  • roles will be validated to make sure that the RequiredRole configuration option is present.
  • Properties relating to the lifetime of the token will be validated.

Storing Configuration Secrets

It is not recommended to store secrets such as blob storage keys in JSON configuration. The following are recommendations for how to more securely store your configuration secrets for different platforms:

Locally

When running locally, a preferred alternative is to specify secrets via environment variables when launching dotnet monitor. The following is an example using PowerShell, setting the value of AzureBlobStorage__monitorBlob__AccountKey prior to beginning collection:

$env:Egress__AzureBlobStorage__monitorBlob__AccountKey = "accountKey"; dotnet-monitor collect

Kubernetes

For Kubernetes, a preferred alternative is to mount your secrets in the file system with restricted access - for more information and an example of how to do this, view the Kubernetes documentation. For additional information on how secrets work in Kubernetes, view the following documentation.

Prometheus Metrics

By default, dotnet-monitor exposes Prometheus metrics using http with an unauthenticated endpoint and no other artifacts are available on this unauthenticated endpoint. This is to support the default scraping configuration. If your application contains custom metrics or tags, ensure that no sensitive data is being emitted in your metrics.