yum install gcc gcc++ make python python-devel git pam-devel
cd /tmp
git clone https://code.google.com/p/google-authenticator/
cd google-authenticator/libpam
make
make install
cd /tmp
rm -Rf google-authenticator/
To enable ssh 2 factor:
sed -i ‘1 a\ auth required pam_google_authenticator.so’ /etc/pam.d/sshd
Make sure that challenge response is listed as YES in your SSHD config
…
ChallengeResponseAuthentication yes
ChallengeResponseAuthentication yes
Login as the user you want to protect and run:
google-authenticator
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