Google Authenticator

Notes Google Authenticator

Display google qr code.
- https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/Example%3Aalice%40google.com%3Fsecret%3DJBSWY3DPEHPK3PXP%26issuer%3DExample
Display on command line
- qrencode -t ANSI -d 300 -s 10 "otpauth://totp/USER@vigor?secret=RBPXTBQB5ZVBUKJINCMBTG4F6E"
With encrypted home dir, need to move the .google_authenticator file out of the home dir.
- Set pam authentication with a non default path
  - auth required pam_google_authenticator.so secret=/etc/googleauthenticator/${USER}/google_authenticator

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