google-authenticator-libpam

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brew install google-authenticator-libpam


Includes google-authenticator binary.
google-authenticator --help


Add 2-factor authentication for ssh:
 echo "auth required /usr/local/opt/google-authenticator-libpam/lib/security/pam_google_authenticator.so" \
 | sudo tee -a /etc/pam.d/sshd

Add 2-factor authentication for ssh allowing users to log in without OTP:
 echo "auth required /usr/local/opt/google-authenticator-libpam/lib/security/pam_google_authenticator.so" \
 "nullok" | sudo tee -a /etc/pam.d/sshd

See also[edit]

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