Configure Cisco ASA VPN to Interoperate with Okta via RADIUS
This guide details how to configure Cisco ASA VPN to use the Okta RADIUS Server Agent.
Okta and Cisco ASA interoperate through RADIUS. For each Cisco ASA appliance, you can configure AAA Server groups which can be RADIUS, TACAS+, LDAP, etc. Using RADIUS, Okta’s agent translates RADIUS authentication requests from the VPN into Okta API calls.
Topics
Before you begin
Before installing the Okta RADIUS Agent ensure that you have met these minimum requirements for network connectivity:
| Source | Destination | Port/Protocol | Description |
|---|---|---|---|
| Okta RADIUS Agent | Okta Identity Cloud | TCP/443 HTTP |
Configuration and authentication traffic |
| Client Gateway | Okta RADIUS Agent | UDP/1812 RADIUS (Default, may be changed in RADIUS app install and configuration) | RADIUS traffic between the gateway (client) and the RADIUS Agent (server) |
Supported factors
The following MFA Factors are supported:
When integrating with Okta RADIUS, the maximum supported number of enrolled factors is dependent on the size of resulting challenge message. Okta recommends that no more than eight ( 8 ) factor be enrolled at one time.
| MFA Factor | Password Authentication Protocol PAP |
Extensible Authentication Protocol - Generic Token Card EAP-GTC |
Extensible Authentication Protocol - Tunneled Transport Layer Security EAP-TTLS |
|---|---|---|---|
| Okta Verify (TOTP and PUSH) | Supported | Supported | Supported - as long as challenge is avoided. For example: MFA-only or password, MFA for TOTP. Push can work with primary auth + MFA as the push challenge is sent out-of-band. |
| Voice Call | Supported | Supported | Not supported |
| SMS Authentication | Supported | Supported | Not supported |
| Google Authenticator | Supported | Supported | Supported - as long as challenge is avoided. For example MFA only or password, MFA. |
| Symantec VIP | Supported | Supported | Supported |
| Security Question | Supported | Supported | Not supported |
| Custom TOTP Authentication | Supported | Supported | Not supported |
| Duo(Push, SMS and Passcode only) | Supported | Not supported | Not supported |
| YubiKey | Supported | Supported | Supported |
|
Supported |
Supported |
Supported |
|
|
Supported |
Supported |
Not supported |
Note
The U2F Security and Windows Hello MFA factors are not compatible with RADIUS-enabled implementations.
For additional information about the Radius apps refer to Configuring RADIUS applications in Okta.
Typical workflow
|
Task |
Description |
|---|---|
| Download the RADIUS agent |
|
| Install the Okta RADIUS Agent. | |
| Configure application |
|
| Configure gateway |
|
| Configure optional settings |
|
| Test |
Related topics
- Current Cisco ASA and ADSM Configuration Guides: https://www.cisco.com/c/en/us/support/security/asa-5500-series-next-generation-firewalls/products-installation-and-configuration-guides-list.htm
- SAML vs RADIUS interoperability
- Installing the Okta RADIUS Agent under Windows or Linux.