topic Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization in Network Security

Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

pakmon1722 — Mon, 01 Feb 2021 17:06:01 GMT

Hello,

Very new to Cisco IOS devices and AAA configurations. We currently have a PKI infrastructure, and are using NPS for radius authentication/authorization.

I've been tasked to change our baseline IOS configuration so that it can validate user pki certificate for authentication and then validate the user with the NPS server for authorization.

Currently we have some basic configuration like this:

aaa authentication login default group radius-server1
aaa authentication login console group radius-server1
aaa authorization console
aaa authorization exec default group radius-server1

I've successfully gotten the certificate authentication to work with the following:

crypto pki trustpoint domain.local
 enrollment terminal
 revocation-check crl none
 revocation-check ocsp none
 authorization list CERT
 authorization username subjectname commonname

ip ssh server certificate profile
   user
      trustpoint verify domain.local

ip ssh server algorithm hostkey x509v3-ssh-rsa
ip ssh server algorithm authentication publickey
ip ssh server algorithm publickey x509v3-ssh-rsa

aaa authorization network CERT none

For the life of me I cannot find a good example for SSH cert authentication/radius authorization. I've read numerous forum posts from people saying you can do cert authentication and then be prompted for username and password for radius authorization, but not concrete examples.

Any help with an example would be appreciated. Thank you

Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

balaji.bandi — Mon, 01 Feb 2021 17:29:48 GMT

Very good question and thinking - i have not deployed and tested. but looking at the document durable.

Authorisation example with ISE- you can replace with NPS configuration here - ( appologies if i misguiding you here)

https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/212178-Configuring-SSH-with-x509-authentication.html

Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

pakmon1722 — Thu, 11 Feb 2021 13:42:53 GMT

Hello,

Thanks for providing the article, it was helpful but only if I'm using TACACS+ and ISE. Unfortunately I'm trying to use radius.

I read here:

Cisco Content Hub - Configuring Authorization and Revocation of Certificates in a PKI

Under the section RADIUS or TACACS+ Choosing a AAA Server Protocol that if you create radius users with the default password cisco it might be possible.

Will test and update this post.

Thanks

Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

balaji.bandi — Thu, 11 Feb 2021 14:40:52 GMT

Thank you for the input, that give more information all members of community, feedback the results will help.

Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

hboesenberg — Fri, 11 Feb 2022 17:58:18 GMT

I am trying to accomplish this exact same procedure. Were you able to successfully authorize through your AAA server?

Re: Cisco IOS MFA -SSH Certificate Authentication/Radius Authorization

Nenday — Mon, 26 Aug 2024 18:12:41 GMT

any one success to do this ?

the BlastRadius will kill us those week