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Cisco ASA Series CLI Configuration Guide
Chapter 1 Configuring Digital Certificates
Information About Digital Certificates
The ASA does not support polling for certificates.
The ASA supports load balancing for this feature.
Revocation Checking
When a certificate is issued, it is valid for a fixed period of time. Sometimes a CA revokes a certificate
before this time period expires; for example, because of security concerns or a change of name or
association. CAs periodically issue a signed list of revoked certificates. Enabling revocation checking
forces the ASA to check that the CA has not revoked a certificate each time that it uses the certificate
for authentication.
When you enable revocation checking, the ASA checks certificate revocation status during the PKI
certificate validation process, which can use either CRL checking, OCSP, or both. OCSP is only used
when the first method returns an error (for example, indicating that the server is unavailable).
With CRL checking, the ASA retrieves, parses, and caches CRLs, which provide a complete list of
revoked (and unrevoked) certificates with their certificate serial numbers. The ASA evaluates certificates
according to CRLs, also called authority revocation lists, from the identity certificate up the chain of
subordinate certificate authorities.
OCSP offers a more scalable method of checking revocation status in that it localizes certificate status
through a validation authority, which it queries for status of a specific certificate.
Supported CA Servers
The ASA supports the following CA servers:
Cisco IOS CS, ASA Local CA, and third-party X.509 compliant CA vendors including, but not limited
to:
•
Baltimore Technologies
•
Entrust
•
Digicert
•
Geotrust
•
GoDaddy
•
iPlanet/Netscape
•
Microsoft Certificate Services
•
RSA Keon
•
Thawte
•
VeriSign
CRLs
CRLs provide the ASA with one way of determining whether a certificate that is within its valid time
range has been revoked by the issuing CA. CRL configuration is part of configuration of a trustpoint.
You can configure the ASA to make CRL checks mandatory when authenticating a certificate by using
the
revocation-check crl
command. You can also make the CRL check optional by using the
revocation-check crl none
command, which allows the certificate authentication to succeed when the
CA is unavailable to provide updated CRL data.
Summary of Contents for 5505 - ASA Firewall Edition Bundle
Page 28: ...Glossary GL 24 Cisco ASA Series CLI Configuration Guide ...
Page 61: ...P A R T 1 Getting Started with the ASA ...
Page 62: ......
Page 219: ...P A R T 2 Configuring High Availability and Scalability ...
Page 220: ......
Page 403: ...P A R T 2 Configuring Interfaces ...
Page 404: ......
Page 499: ...P A R T 2 Configuring Basic Settings ...
Page 500: ......
Page 533: ...P A R T 2 Configuring Objects and Access Lists ...
Page 534: ......
Page 601: ...P A R T 2 Configuring IP Routing ...
Page 602: ......
Page 745: ...P A R T 2 Configuring Network Address Translation ...
Page 746: ......
Page 845: ...P A R T 2 Configuring AAA Servers and the Local Database ...
Page 846: ......
Page 981: ...P A R T 2 Configuring Access Control ...
Page 982: ......
Page 1061: ...P A R T 2 Configuring Service Policies Using the Modular Policy Framework ...
Page 1062: ......
Page 1093: ...P A R T 2 Configuring Application Inspection ...
Page 1094: ......
Page 1191: ...P A R T 2 Configuring Unified Communications ...
Page 1192: ......
Page 1333: ...P A R T 2 Configuring Connection Settings and QoS ...
Page 1334: ......
Page 1379: ...P A R T 2 Configuring Advanced Network Protection ...
Page 1380: ......
Page 1475: ...P A R T 2 Configuring Modules ...
Page 1476: ......
Page 1549: ...P A R T 2 Configuring VPN ...
Page 1550: ......
Page 1965: ...P A R T 2 Configuring Logging SNMP and Smart Call Home ...
Page 1966: ......
Page 2059: ...P A R T 2 System Administration ...
Page 2060: ......
Page 2098: ...1 8 Cisco ASA Series CLI Configuration Guide Chapter 1 Troubleshooting Viewing the Coredump ...
Page 2099: ...P A R T 2 Reference ...
Page 2100: ......