Add 'allow_readonly' option

AliakseiKorneu commented 4 years ago

See Issue #13

Several times we were faced with the situation when we could not log into the server because there was no free space, and the module should update the file due to the grace_period option enabled. As a result, the module failed during file updates and don't give access to the server.

This fix ignores errors that occur when trying to update the .google_authenticator file but leaves 2FA functionality enabled.

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AliakseiKorneu commented 4 years ago

@googlebot I signed it!

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ThomasHabets commented 4 years ago

Kinda defeats the "one" in "one time password".

I'll merge it but will add extra scare language in the documentation. (attacker can fill up the disk, then attack other accounts on the system)

google / google-authenticator-libpam