Re: pam_duo 2FA && ssh-key access

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On 26/01/2021 19:04, Avila, Geoffrey wrote:
We have an ssh login host we've protected with Duo's 2FA pam module. We're
allowing both password auth and ssh-keys. Problem is, those users with a
valid ssh key are instantly allowed to log in-the pam stack for the duo .so
module never gets called, and the users are never prompted for 2FA.
Is there a way to compel the execution of PAM modules before OpenSSH
completes the login process for the user?

I use the following (with Yubikey PAM module for 2FA):

# Policy for authentication: require both pubkey *and* PAM
AuthenticationMethods publickey,keyboard-interactive:pam

# From local and VPN addresses, 2FA not required
Match Address 192.168.0.0/16,10.0.0.0/8
AuthenticationMethods publickey

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