A packet capture for the request looks similar to this: The response is simply the binary-encoded CA certificate (X.509). The new certificate template is listed now within the Certificate Templates folder content. Under advanced, there will be three tabs. Any certificate extensions reqested, such as: response body is the DER-encoded X.509 CA certificate, response body is a DER-encoded degenerate PKCS#7 that contains the CA and RA certificates. In the Trustpoint field, select the new trustpoint from the drop down menu and click Update & Apply to Device. Select Enabled or Provision List from the drop down menu next to the Status label and then click Apply to Trigger AP LSC enrollement. As a result, the client needs to keep a copy of the pre- and post-rollover certificates for both the CA and the ID certificate. Actual data that is signed - With SCEP, this is a PKCS#7 Enveloped-data format (Encrypted Envelope). Once max attempts limit is reached, the APs fallback to MIC and join again, but since LSC provision is enabled the APs request a new LSC. To remove this feature, the registry key on the NDES server needs to be modified: Step 1. If "Prompt For Challenge Password" isn't supported with SCEP Proxy, it seems like Cisco took one step forward and one step backward with the … CLI configuration for steps one and two, in this configuration example the keypair is generated with label AP-LSC and modulus size of 2048 bits: Step 3. Obtain a copy of the Certificate Authority (CA) certificate and validate it. Step 2. Is there anything interesting in your CA debug log file? Currently there is no support to open a provision window. If the templates are not properly mapped in the server registry or if the server requires password challenge, the certificate request for either the 9800 WLC or the APs is rejected. All rights reserved. Select the Network Device Enrollment Service, and Online Responder role services to be configured in the menu, then select Next. Unlike a normal renewal request, the "Shadow ID" certificate that is returned becomes valid at the time of CA certificate expiration (rollover). Step 1. SCEP certificate profiles directly reference the trusted certificate profile that you use to provision devices with a Trusted Root CA certificate. Step 4. Step 5. The password is used on the device to authorize the certificate request. controller acts as a CA-proxy and help to get the certificate request (self-generated) signed by the CA for the AP. The following SCEP messages are implemented: 1. GetCACert 4. Caution: If LSC is enabled but the 9800 WLC's trustpoint refers to the MIC or an SSC, the APs try to join with the LSC for the configured number of join attempts. 9800 Wireless LAN Controller version 16.10.1 or higher. Thank you, Andrew On 04/21/2011 06:00 AM, Jennings, Charles wrote: Looking for some help: Step 2. The SCEP CA MUST NOT attempt to authenticate a client based on a self-signed certificate unless it has been verified through out-of-band means such as a … Renewal happens when the ID certificate of the client approaches expiration, and its expiration date is not the same (earlier than) as the expiration date of the CA certificate. This is … Step 4. Navigate to Computer > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Cryptography > MSCEP > EnforcePassword. Right-click on the Users certificate template, then select Duplicate Template in the context menu. This document specifies the Simple Certificate Enrollment Protocol (SCEP), a Public Key Infrastructure (PKI) communication protocol which leverages existing technology by using PKCS#7 and PKCS#10 over HTTP. It sends this request to the NDES server. CLI configuration for steps three and four: Caution: The subject-name configuration line must be formatted in LDAP syntax, otherwise it is not accepted by the controller. The Cisco ASA displays the FQDN to be used in the certificate. Edit the EncryptionTemplate, GeneralPurposeTemplate, and SignatureTemplate registries so that they point to the newly created certificate template. Step 5. The controller needs to have a trustpoint defined to authenticate APs once they have been provisioned. If it is already 0, then leave it as is. The encrypted data - This is encrypted with a randomly generated key (that has been encrypted with the recipient's public key). Navigate to the URL http://
/certsrv/mscep/mscep.dll to verify that the service is available. Within the same menu, input the AP ethernet mac address in format xxxx.xxxx.xxxx in the text field and click the + sign. If you need to install new APs, they need to be previously provisioned with an LSC signed by the same CA that the one in the management trustpoint. As shown in the third shaded line, the Cisco ASA asks if you would like to include its serial number in … Step 8. Inclusion of the challengePassword by the SCEP client is OPTIONAL and allows for unauthenticated authorization of enrollment requests. The client needs to validate that the CA certificate is trusted through an examination of the fingerprint/hash. to trust the SCEP server when testing connections, retrieving challenge passwords, and acting as a proxy for SCEP requests from devices. A pre-shared secret key provided by the CA, which adds additional layer of security. There is a solution called SCEPman | Intune SCEP-as-a-Service build by Glück & Kanja Consulting AG available in the Azure Marketplace.All it needs is an active Azure Subscription. When the SCEP client's ID certificate approaches expiration, the SCEP client queries the CA for the "Shadow CA" Certificate. GetCRL 3. Password cache The service maintains a list of passwords it has supplied to the device administrators to enable device authentication. List of the signers and the fingerprint generated by each signer - With SCEP, there is only one signer. By default, the Windows Server used a dynamic challenge password to authenticate client and endpoint requests before enrollment within Microsoft SCEP (MSCEP). The request asked for attributes that the CA did not authorize, The request was signed by an identity that the CA does not trust. In the Service Account for NDES select either option between the built-in application pool or the service account, then select Next. In this example the trustpoint name is "microsoft-ca" (only relevant output is displayed): In order to verify the details about the wireless management trustpoint run the show wireless management trustpoint command, ensure that the correct trustpoint (the one that contains the LSC details, AP-LSC in this example) is in use and is marked as Available: In order to verify the details about the AP LSC provisioning configuration, along with the list of APs added to the provision list, run the show ap lsc-provision summary command. Note:Subject-name-parameters restricted to 2 characters like country code must be strictly respected, as the 9800 WLC does not validate those attributes.For more information consult the defect CSCvo72999 as a reference. Step 3. Note: To enable port dot1x for the APs, it is needed to define the dot1x credentials for the APs in either the AP profile or the AP configuration itself with dummy values. Select it and select the Configure Active Directory Services on the destination server option link to lauch the AD CS Configuration wizard menu. With SCEP, the CA and device certificates are received from the CA server, and later installed automatically in the controller. Step 10. It is also used by MdM and EMM solutions to enroll certificates on behalf of devices such as mobiles. Go to HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\MSCEP. Cisco recommends that you have knowledge of these technologies: The information in this document is based on these software and hardware versions: Note: The server side configuration in this document is specifically WLC SCEP, for additional strengthten, security, and certificate server configurations please refer to Microsoft TechNet. Rollover happens when the ID certificate approaches expiration, and its expiration date is the same as the CA's certificate expiration date. 2. Version number - With SCEP, version 0 is used. Navigate to the Security tab, ensure that the service account defined in Step 6 of the Enable SCEP Services in the Windows Server has Full Control permissions of the template, then select Apply and OK. The new LSC certificates, both Certificate Authority (CA) root certificate and device certificate, must be installed on the controller to eventually download it in the APs. SCEP is specified in the IETF draft Simple Certificate Enrollment Protocol (draft-nourse-scep-23). Step 1. There must be reachability between the controller and the server. From there, select the server instance that is used for SCEP server enrollment. Fill out the trustpoint details with the device information, and then select Apply to Device: Warning: The 9800 controller does not support multi-tier server chains for LSC installation, so the root CA must be the one that signs the certificate requests from the controller and the APs. Generate a CSR and send it securely to the CA. 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