faruqisan / go-tfa

Two factor authenticator client

Google Authenticator

A small go program to generate the google authenticator code.

• Install go

  • On OSX run brew install go.
  • Follow instructions on https://golang.org/doc/install for other OSes.

• Setup go

  • Make sure that the executable go is in your shell's path.
  • Add the following in your .zshrc or .bashrc: (where <workspace_dir> is the directory in which you'll checkout your code)

GOPATH=<workspace_dir>
export GOPATH
PATH="${PATH}:${GOPATH}/bin"
export PATH

• Clone the repo in your GOPATH
• Provide your 16-digit secret token in secrets.pem file
• Change the input file in google-authenticator.go from dummy_secret.pem to secret.pem

The auth code works on the secret token and the current time. The time on your local machine should be in sync according to NTP.

• Run sudo ntpdate time.nist.gov to sync time
• Run go run google_authenticator.go. (For MAC users, it will copy the code to clipboard also)