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google-authenticator-libpam-remote-verification

The original google-authenticator-libpam verifies the code in the login server. If the server is hacked, all the secret will be lost. To improve the security for the system, the code is modified to verify the code in remote server. The code is sent to another python socket server called ClientServer through unix file. The the code then is sent to Server to verify. The Server connects with mysql to get the otp secret to verify.

Install google-authenticator-libpam

cd google-authenticator-libpam
./bootstrap.sh
./configure
make
cp .libs/pam_google_authenticator.so /usr/lib64/security

Config google-authenticator-libpam

  1. The user parameter must be set in /etc/pam.d/sshd
  2. The socket parameter must be set to connect with ClientServer and is should be the same with SOCK_ADDR in config.py
  3. Other setting is the same in original google-authenticator-libpam
  4. The following parameters do not work any more: secret, noskewadj, grace_period
  5. Example:auth required pam_google_authenticator.so user=otp socket=/tmp/sock1

Run Servers

  1. Server: python3 OTPServer.py server in a verification server which can connect to mysql.
  2. ClientServer: sudo -u username python3 OTPServer.py client in the login server. username should be the same with user in /etc/pam.d/sshd

OTP Utils

  1. python3 OTPServer.py util new username set new otp secret the speficy user.
  2. python3 OTPServer.py util get username get otp secret the speficy user.
  3. python3 OTPServer.py util verify username otpcode verify the otpcode for a specific user.