![]() Host = 'wss://'.format(_name, auth_token, self.node_id) The easiest way to identify where this data is being sent is to look into this code in the Azure CLI, since it is open source.Īfter some digging, the code for this command in the Azure CLI can be found at the following file: Knowing this, we can infer that the Azure CLI is listening on our local socket, accepting connections, and forwarding all data received on those sockets towards the Bastion service, somewhere. The RDP session is established with the local system on the port specified in the command. This section explains the process of reverse engineering the service. TLDR skip this section if you just want to know how the native client connections work. By connecting to that local port with the native rdp client, the user can access the internal VM over rdp.īastion Native Client RDP session Reverse Engineering Native Client Support In practice, both of these commands are the same, but the second command allows the user to define the connection in more detail.īy running the second command, the Azure CLI creates a tunnel and listens on a local port. Note that the second command specifies a local port and a “resource port”. These two options look like the following:Īz network bastion rdp -name "" -resource-group "" -target-resource-id ""Īz network bastion tunnel -name "" -resource-group "" -target-resource-id "" -resource-port "" -port "" ![]() There are two options for connecting to a VM over RDP, for example, through bastion. So how does this work under the hood? Native Client SetupĪccording to Microsoft’s documentation, the user must use the Azure CLI to establish a connection using their native clients. Instead of logging in through the Azure Portal, Azure Bastion now allows users to connect using their native RDP or SSH clients. However, a new feature is available that allows users to connect via their native SSH or RDP client instead of the web interface, which is what this article is about. Additionally, users are required to authenticate to bastion using their Azure AD credentials, in addition to protocol specific authentication once a session is established with an internal VM.īastion supports RDP and SSH, and provides users with access to a browser based session for these protocols through the Azure Portal, based on Apache Guacamole. ![]() Since Azure manages the host for the customer, the customer does not need to worry about patching or management, and relies on Microsoft to ensure no vulnerabilities exist on the host or on the services running there. ![]() Microsoft markets it as a secure way to access internal virtual machines without exposing public IP addresses directly on those systems. What is Azure BastionĪzure Bastion is a managed Bastion host running in a customer’s Virtual Network. This again reduces the attack surface of the system. No other software runs on these systems other than the service running at the port, such as ssh. By funneling all traffic through these servers, administrators can limit network attack surface to a system that is hardened and heavily monitored.īastion hosts are generally single purpose systems that only listen on one port. They are generally used as an entry point into some zone in a private network. Azure Bastion Tcp Tunneling Enabled What is a Bastion host?īastion hosts provide access to internal resources from an external network. ![]()
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