To start a new SCEP configuration, click Add and then complete the following fields.
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(Optional) To make SCEP-based certificate generation more secure, you can configure a SCEP challenge-response mechanism (a one-time password (OTP)) between the public key infrastructure (PKI) and the portal for each certificate request.
The challenge mechanism that you select determines the source of the OTP. If you select Fixed, copy the enrollment challenge password from the SCEP server for the PKI and enter the string in the portal’s Password dialog that displays when configured as Fixed. Each time the portal requests a certificate, it uses this password to authenticate with the PKI. If you select Dynamic, you enter the username and password of your choice (possibly the credentials of the PKI administrator) and the SCEP Server URL where the portal-client submits these credentials. This username and password remains the same while the SCEP server transparently generates an OTP password for the portal upon each certificate request. (You can see this OTP change after a screen refresh in “The enrollment challenge password is” field upon each certificate request.) The PKI transparently passes each new password to the portal, which then uses the password for its certificate request.
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(Recommended) Token-based CN—Enter one of the supported tokens $USERNAME, $EMAILADDRESS, or $HOSTID. Use the username or email address variable to ensure that the portal requests certificates for a specific user. To request certificates for the device only, specify the hostid variable. When the GlobalProtect portal pushes the SCEP settings to the agent, the CN portion of the subject name is replaced with the actual value (username, hostid, or email address) of the certificate owner. For example:
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Static CN—The CN you specify will be used as the subject for all certificates issued by the SCEP server. For example:
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RFC 822 Name—Enter the email name in a certificate’s subject or Subject Alternative Name extension.
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DNS Name—Enter the DNS name used to evaluate certificates.
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Number of Bits—Select the key’s Number of Bits for the certificate. If the firewall is in FIPS-CC mode, the generated keys must be at least 2,048 bits. (FIPS-CC operation is indicated on the firewall login page and the firewall status bar.)
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Digest—Select the Digest algorithm for the certificate: SHA1, SHA256, SHA384, or SHA512. If the firewall is in FIPS-CC mode, you must select SHA256, SHA384, or SHA512 as the Digest algorithm.
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(Optional) To ensure that the portal connects to the correct SCEP server, enter the CA Certificate Fingerprint. Obtain this fingerprint from the SCEP server interface in the Thumbprint field.
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To enable SSL, select the root CA Certificate for the SCEP server. Optionally, you can enable mutual SSL authentication between the SCEP server and the GlobalProtect portal by selecting a Client Certificate.
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