Network Device Enrollment Service (NDES) in Active Directory Certificate Services (AD CS) - Tech. Net Articles - United States (English)The Network Device Enrollment Service (NDES) is one of the role services of the Active Directory Certificate Services (AD CS) role. The main points about the above code are: Step 1 sets up the parameters for the Active Directory search. DirectoryEntry is a class in the System.DirectoryServices.It implements the Simple Certificate Enrollment Protocol (SCEP). SCEP defines the communication between. Registration Authority (RA) for certificate enrollment and is defined in detail in. The goal of SCEP is to support the secure issuance of certificates to network devices in a scalable manner, using existing technology whenever possible .". This article was updated to cover the Windows Server 2. With the current low prices for servers and the need for processing power, even a small company may end up with quite a few of them. If ten years ago it was still. Some functionality was modified in the Windows Server 2. R2 release, Windows Server 2. Service Pack 2, and software updates for the Windows Server 2. Whenever applicable, the document will explicitly state the differences between the different operating. SCEP implementation is available in the Resource Kit for Windows 2. Server and Windows Server 2. It is also known as the Microsoft Simple Certificate Enrollment Protocol (MSCEP). Appendix 1 highlights the delta between the SCEP implementation in the. Windows Server 2. Windows Server 2. Return to Top. Prerequisites. This article is intended for those with a basic understanding of PKI concepts and x. Return to Top. Understanding the Network Device Enrollment Service. This is a step-by-step guide on how to enable active directory logon, logoff and failure events with clear steps. Best Practices for Deploying and Managing the Windows Azure Active Directory Sync Tool. The need to secure networks has grown substantially over the last few years. One of the security challenges organizations face is authentication. There are few protocols that can be used for authentication- one of which, Internet Protocol Security (IPSec). X5. 09 version 3 certificates as a means to identify the entities involved in a secure session. However, the challenge has moved from authentication to issuance certificate to these end entities. Moreover, our network includes devices that do not run with. SCEP enables network devices that do not run with domain credentials to enroll for x. Certification Authority (CA). At the end of the transactions defined in this protocol, the network device will have a private key and associated certificate that is issued by a CA. Applications on the device may use the key and its associated certificate to interact with other entities. The most common usage of this certificate on a network device is to authenticate the device in an IPSec session. Return to Top. The Entities. The following entities are involved in SCEP. Device (client) This is the actual client for this protocol. It can be a router or any other device including software components such as virtual private network (VPN) clients that do not run with domain credentials; hence, they cannot authenticate. Device Administrator This entity is responsible for the administration of the device or client. Network Device Enrollment Service (Service) This is the service that corresponds to the server in the SCEP. This service might be referred to as the RA. CA server This is the server that runs Certificate Services. The CA issues client certificates. CA administrator This user has administrator rights on the CA server and can modify its policy settings. Domain Controller (DC) This is the server that runs Microsoft Active Directory Domain Services. It is used as a central repository for certificate templates to enforce certificate issuance policies across the domain. Return to Top. Terminology Used in this Article. Password challenge As defined in the SCEP, the password challenge is a sequence of bytes the service may supply to the device administrator and can later be used to authenticate the device. Password cache The service maintains a list of passwords it has supplied to the device administrators to enable device authentication. The service uses an in- memory cache for these passwords. Once a password has been used, it will be removed. Administration site This is the Web site that should be used by a device administrator to obtain password challenges for device enrollment. Service certificates These are the two certificates the service will use during the device enrollment session. The encryption certificate will be used by the device to encrypt the password challenge it sends with the enrollment request. The signing certificate will be used by the service to send the device request to the CA. Configured CA The Network Device Enrollment Service has one CA that is used for sending certificate requests and retrieving CA information. This CA is configured during the service setup and cannot be modified later. It can be either an. Enterprise CA or a Stand- alone CA. Configured Certificate Templates If the configured CA is an enterprise CA, the Network Device Enrollment Service will use the configured templates when sending an enrollment request to the CA. Three configured templates are defined in. For more information, see. Configuring the Network Device Enrollment Service. Return to Top. The Enrollment Process. Figure 1 illustrates the various steps for enrolling certificates through the Network Device Enrollment Service. Figure 1 : Enrollment Process The enrollment process includes the following steps. The device generates an RSA public- private key pair on the device. The administrator obtains a password from the Network Device Enrollment Service. The administrator browses to the administration Web page. The service verifies that the administrator holds the required permissions for the configured certificate templates. The administrator sets the device with the password and sets it to trust the enterprise PKI. The administrator configures the device to send the enrollment request to the Network Device Enrollment Service. The Network Device Enrollment Service signs the enrollment request with its Enrollment Agent certificate and sends it to the CA. The CA issues the certificate and returns to the service. The device retrieves the issued certificate from the service. Step 1: Generates a public- private key pair In this step, the device must create a private and public key pair. The device must define the cryptography actions enabled for this key from the following list. Signing and signature verifications, ORDecryption and encryption, ORBoth At the end of the step, the device must have a public- private key pair for cryptography operations. Step 2: Obtains a password from the Network Device Enrollment Service In this step, the device administrator obtains a password from the Network Device Enrollment Service at. Server. Name> /certsrv/mscep_admin (Figure 2). Noteshttps is not required, but is recommended. By default, the service requires a password for authenticating the devices in step 4; however, the service can be configured to accept requests without obtaining passwords. The service gets the requestor credentials and verifies that it possesses the following permissions. If the service- configured CA is an Enterprise CA, the requestor must have Enroll permission for all three configured certificate templates. These templates are set through the Encryption. Template, Signature. Template, and General. Purpose. Template registry keys. For more information about configuring templates, see Configuring Templates for Device Enrollment. If the service- configured CA is a Stand- alone CA, the requestor must be a member of the CA Administrators group. Next, the service will check that the password table is not full. If it is not full, the service will create a random password and embed it in the html page returned to the caller. For more information about the service password table, see Password and Password. Cache. Figure 2 : Administration Web Page Step 3: Sets the device to trust the Enterprise PKI This step is specific for each device. By the end of this step, the device should be configured to trust the enterprise PKI. It is usually achieved when the device is invoking the Get. CACert operation implemented by the service, and trusting the returned. CA certificate. The following is an example for a call to get the CA certificate. Get. CACert& message=My. Device. IDStep 4: Submits a certificate enrollment request to the service In this step, the device administrator performs the required steps to submit a request from the device to the service. If the service requires a password, the administrator needs to configure the device with the password that was received from the service. Step 2. This step is device- specific. Once it is completed, the service must receive a PKCS #7 request containing the required information for the device enrollment.
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