The SCEP CA MAY use the challengePassword in addition to the previously issued certificate that signs the request to authenticate the request. It then requests a SCEP challenge password from the management point. As shown in the third shaded line, the Cisco ASA asks if you would like to include its serial number in … This field is parsed by the authenticator to verify that it is used by the client for its intended purpose. 2. The password will be prompted as following: router1(config) #crypto ca enroll cisco % % Start certificate enrollment .. % Create a challenge password. 0 Helpful Reboot the NDES server, so return to the Certification Authority window, select on the server name, and select the Stop and Play button succssively. Only the CA can actually decrypt the "Encrypted Data.". © 2020 Cisco and/or its affiliates. Instead of manually specifying a large number of parameters, such as company name and IP address, SCEP sends the certificate server this information automatically after reading the data from within the concentrator's configuration. Title: Cisco Router and RA SCEP & PIN. Wait for the server to complete the feature installation process, then select Close to close the Wizard. All rights reserved. After the installation, the SCEP url is available with any web brower. Verify that the Certification Authority, Network Device Enrollment Service, and Online Responder features are selected, and then select Next: Step 3. The EnvelopedData PKCS#7 is a container that contains "Encrypted Data" and the "decryption key." SCEP is specified in the IETF draft Simple Certificate Enrollment Protocol (draft-nourse-scep-23). Certificate type – The CSR needs to specify the entity type of the certificate; SCEP endpoint URL – The endpoint to which the device will make the cert request; Subject Name and Subject Alternate Name – To identify the entity for which the certificate is being requested The data format includes the original data and the associated metadata necessary in order to perform the cryptographic operation. By default, the Windows Server used a dynamic challenge password to authenticate client and endpoint requests before enrollment within Microsoft SCEP (MSCEP). What I don't understand and cannot find on the Internet is Certificate Enrollment on FTD. This has to be done via an out-of-band method (a phone call to a system administrator or pre-configuration of the fingerprint within the trustpoint). This document describes the Simple Certificate Enrollment Protocol (SCEP), which is a protocol used for enrollment and other Public Key Infrastructure (PKI) operations. Return to the Certification Authority window, right-click in the Certificate Templates folder and select New > Certificate Template to Issue. Step 1. Simple Certificate Enrollment Protocol (SCEP)--A Cisco-developed enrollment protocol that uses HTTP to communicate with the CA or registration authority (RA). Alternatively, upload a csv file that contains the AP mac addresses, select the file and then select Upload File. Under the PasswordMax key, create a new DWORD key named PasswordMax and increase the value. 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). Step 3. The client needs to validate that the CA certificate is trusted through an examination of the fingerprint/hash. If it is already 0, then leave it as is. Step 1. It proceeds in a few steps: The SCEP server issues a one-time password (the “challenge password”), transmitted out-of … Private Key Infrastructure (PKI) and certificates. After invoking the crypto ca enroll command, the Cisco ASA asks you for a password to be used for this certificate. The new certificate template is listed now within the Certificate Templates folder content. Step 2. To make sure that the proper application policy is integrated to the WLC and AP certificates, create the proper certificate template and map it to the NDES registry: Step 1. Step 5. 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. GetCACertChain 5. This document describes how to configure the 9800 Wireless LAN Controller (WLC) for Locally Significant Certificate (LSC) enrollment for Access Point (AP) join purposes through the Microsoft Network Device Enrollment Service (NDES) and Simple Certificate Enrollment Protocol (SCEP) features within Windows Server 2012 R2 Standard. SCEP certificate profiles directly reference the trusted certificate profile that you use to provision devices with a Trusted Root CA certificate. The controller needs to have a trustpoint defined to authenticate APs once they have been provisioned. List of Digest Algorithms Used - With SCEP, there is only one Signer and thus only one Hashing Algorithm. Click the SCEP Challenge Password tab. Navigate to Configuration > Security > PKI Management and select the RSA Keypair Generation tab. Navigate to Configuration > Interface > Wireless and select the management interface. 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. Ensure that the correct proviosion state is shown: In order to verify the certificates installed in the AP run the show crypto command from the AP CLI, ensure that both CA Root certificate and Device certificate are present (the output shows only relevant data): If LSC for switch port dot1x authentication is used, from the AP you can verify if port authentication is enabled. Inclusion of the challengePassword by the SCEP client is OPTIONAL and allows for unauthenticated authorization of enrollment requests. This document describes the Simple Certificate Enrollment Protocol (SCEP), which is a protocol used for enrollment and other Public Key Infrastructure (PKI) operations. Poll the SCEP server in order to check whether the certificate was signed. password to the CA Administrator in order to revoke your certificate. Under advanced, there will be three tabs. In this specific case, the recipient is the CA; as a result. The controller and the server are synchronized to the same NTP server, or share the same date and timezone (If the time is different between the CA server and the time from the AP, the AP has issues with certificate validation and installation). There is a slight behavioral difference between renewal and rollover. (Optional) AP LSC provisioning can be triggered for all the APs joined to the controller, or to specific APs defined in a mac address list. The SignedData PKCS#7 is signed by the client with one of these certificates; it is used to prove that the client sent it and that it has not been altered in transit: A self-signed certificate (used upon initial enrollment), A Manufacturer Installed Certificate (MIC), A current certification that expires soon (re-enrollment). Ensure that Client Authentication is in the Application Policies window; otherwise,select Add and add it. A packet capture for the request looks similar to this: The response is simply the binary-encoded CA certificate (X.509). Step 10. PKCS#7 content might or might not contain encrypted/signed enveloped data; if it does not (only contains a set of certificates), it is referred to as a degenerate PKCS#7. The Cisco ASA displays the FQDN to be used in the certificate. Enrollment and usage of SCEP generally follows this work flow: SCEP uses the CA certificate in order to secure the message exchange for the CSR. Tip: If AP LSC provisioning is done through a pre-production controller is used along with the provision list, do not remove the AP entries once the certificate is provisioned. Note: PKCS#7 and PKCS#10 are not SCEP-specific. The enrollment challenge password is generated, 8C095292BF12FAAD in the example below. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Legacy SCEP using the CLI Configuration Guide, Request/response model based on HTTP (GET method; optional support for POST method), Uses PKCS#10 as the certificate request format, Uses PKCS#7 in order to convey cryptographically signed/encrypted messages, Supports asynchronous granting by the server, with regular polling by the requester, Has limited Certificate Revocation List (CRL) retrieval support (the preferred method is through a CRL Distribution Point (CDP) query, for scalability reasons), Does not support online certificate revocation (must be done offline through other means). A little background from the product description: Microsoft Intune allows third-party certificate authorities (CA) to issue and validate certificates using the Simple Certificate Enrollment Protocol (). Go to Configuration->Remote Access VPN->Certificate Management->Identity Certificates. PKCS#7 is a defined data format that allows data to be signed or encrypted. A Device admin accesses the SCEP- admin page and receives a temporary/one-time password. PKCS#10 [RFC2986] specifies a PKCS#9 [RFC2985] challengePassword attribute to be sent as part of the enrollment request. Select it and select the Configure Active Directory Services on the destination server option link to lauch the AD CS Configuration wizard menu. The signed envelope is a format that carries data and confirms that the encapsulated data is not altered in transit via digital signatures. Obtain a copy of the Certificate Authority (CA) certificate and validate it. If this is done, and the APs fallback to MIC and join the same pre-production controller, their LSC certificates are erased. This structure is used as the building blocks of SCEP. 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. Step 9. It sends this request to the NDES server. GetCRL 3. A pop-up appears to indicate that users do not need admin approval to get their certificate signed, select OK. The "Encrypted Data" portion of the Enveloped PKCS#7 is the CSR (PKCS#10). Set the SCEP challenge password. List of certificates of the signers - With SCEP, this is a self-signed certificate on initial enrollment or the current certificate if you re-enroll. SCEP is a protocol supported by several manufacturers, including Microsoft and Cisco, and designed to make certificate issuance easier in particular in large-scale environments. Simple Certificate Enrollment Protocol (SCEP), designed by Cisco, is a way for a router to communicate a certificate issuing authority, such as a CA, to enroll certificates for the router. The following SCEP messages are implemented: 1. 2. Servers and server roles The following on-premises infrastructure must run on servers that are domain-joined to your Active Directory, with the exception of the Web Application Proxy Server. Return to the Registry Editor window and navigate to Computer > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Cryptography > MSCEP. Step 4. 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. The CA generates a new CA certificate which becomes valid once the current CA certificate expires. 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. In the Server Manager application, select the Manage menu and then select the Add Roles and Features option to open the role Add Roles and Features Configuration Wizard. From there, select the server instance that is used for SCEP server enrollment. Step 1. View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices. 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. You will need to verbally provide this. In order to successfully perform SCEP with the Windows Server, the 9800 WLC must meet these requirements: The Windows Server must have the Internet Information Services (IIS) previously enabled. In the Password and Confirm Password fields, enter the OTP that you obtained in Step 1. c. Click OK, which returns you to the Add Identity Certificate dialog. Specify whether the key is 1024 or 2048 bits. If the POST method is supported, content that would be sent in Base64 encoding with GET might be sent in binary format with POST instead. If time is not synchronized between the server and the 9800 WLC, certificates are not installed since time validity check fails. The "Prompt for Challenge Password" variable seems to be part of the XML tag used for the "CA URL" which is only used in Legacy SCEP. The configuration is performed either throught the web interface or the command line. The text is then URL Decoded into an ASCII text string. The NDES server forwards the request to the certificate registration point site system via the NDES policy module. Unlike a normal renewal request, the "Shadow ID" certificate that is returned becomes valid at the time of CA certificate expiration (rollover). 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. Expand the CA Server folder tree, right-click on the Certificate Templates folders and select Manage. For security reasons your password will not be saved in the configuration. 3. Navigate to Computer > HKEY_LOCAL_MACHINE > SOFTWARE > Microsoft > Cryptography > MSCEP > EnforcePassword. It is also used by MdM and EMM solutions to enroll certificates on behalf of devices such as mobiles. Enable SCEP Services in the Windows Server, Disable SCEP Enrollment Challenge Password Requirement, Configure the Certificate Template and Registry, Define AP Enrollment Parameters and Update Management Trustpoint, Verify Controller Certificate Installation, Verify Access Point Certificate Installation, Example of a Successful Enrollment Attempt. Please make a note of it. The client generates a CSR and goes through the Enrollment process (as defined previously). Step 8. Obtain a copy of the Certificate Authority (CA) certificate and validate it. Step 7. Re-enroll as necessary in order to obtain a new certificate prior to the expiration of the current certificate. Note: The newly created certificate template may take longer to be listed in multiple server deployments as it needs to be replicated accross all servers. GetCACert 4. The request is sent as a HTTP GET request. The text after the "message=" is a URL Encoded String, which is extracted from the GET request string. Key Size. To verify that the LSC information is present in the 9800 WLC trustpoint issue the command show crypto pki certificates verbose , two certificates are associated to the trustpoint created for LSC provisioning and enrollment. Caution: When the Validity period is modified, ensure that it is not greater than the Certification Authority root certificate validity. A packet capture for the request looks similar to this: The response to the SCEP enrollment request is one of three types: Prior to certificate expiration, the client needs to get a new certificate. If the IIS default sites are disabled, the SCEP service is disabled as well, therefore the URL defined in the trustpoint is not reachable and the 9800 WLC does not send any certificate request. 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. The LSC feature on a controller does not take password challenge. The GetCACert operation is used. Rollover happens when the ID certificate approaches expiration, and its expiration date is the same as the CA's certificate expiration date. In the Service Account for NDES select either option between the built-in application pool or the service account, then select Next. The request asked for attributes that the CA did not authorize, The request was signed by an identity that the CA does not trust. Use these commands to troubleshoot 9800 controller certificate enrollment: In order to troubleshoot and monitor AP enrollment use these commands: From the AP command line, show logging shows if the AP had issues with certificate installation, and it provides details about the reason certificate was not installed: This is the output from the debugs before mentioned for a successful enrollment for both the controller and its associated APs. 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