I’m trying to integrate DUO 2FA on RHEL7 machines managed by Active Directory through SSSD. Once I’ve ensured users can SSH into machine using AD credentials, I then
- Install duoauthproxy following instructions at LDAP | Duo Security
- Install duo PAM following instructions at Duo Unix - Two-Factor Authentication for SSH | Duo Security, except I do not make change to the PAM configuration
- modify the config files so:
/etc/pam.d/system-auth
auth required pam_env.so
auth required pam_faildelay.so delay=2000000
auth [default=1 ignore=ignore success=ok] pam_succeed_if.so uid >= 1000 quiet
auth [default=1 ignore=ignore success=ok] pam_localuser.so
auth requisite pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 1000 quiet_success
auth requisite pam_sss.so forward_pass # Changed sufficient to requisite
auth sufficient pam_duo.so # Added <========================
auth required pam_deny.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 1000 quiet
account [default=bad success=ok user_unknown=ignore] pam_sss.so
account required pam_permit.so
password requisite pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password sufficient pam_sss.so use_authtok
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
-session optional pam_systemd.so
session optional pam_oddjob_mkhomedir.so umask=0077
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
session optional pam_sss.so
/etc/pam.d/password-auth
auth required pam_env.so
auth required pam_faildelay.so delay=2000000
auth [default=1 ignore=ignore success=ok] pam_succeed_if.so uid >= 1000 quiet
auth [default=1 ignore=ignore success=ok] pam_localuser.so
auth requisite pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 1000 quiet_success
auth requisite pam_sss.so forward_pass # Changed sufficient to requisite
auth sufficient pam_duo.so # Added <========================
auth required pam_deny.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 1000 quiet
account [default=bad success=ok user_unknown=ignore] pam_sss.so
account required pam_permit.so
password requisite pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password sufficient pam_sss.so use_authtok
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
-session optional pam_systemd.so
session optional pam_oddjob_mkhomedir.so umask=0077
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
session optional pam_sss.so
Important bits in /etc/ssh/sshd_config
PasswordAuthentication no
ChallengeResponseAuthentication yes
AuthenticationMethods keyboard-interactive
DUO doesn’t get triggered i.e., users can login using AD credentials like before as if DUO wasn’t installed at all. What am I missing here?
