Updating to 1.3.1 may require user intervention

[LDVG]

As part of the 1.3.1 update, permissions checking of the authfile were hardened. If your authfile is writable by the file's group (g) or other users (o), pam-u2f will refuse to authenticate. Please ensure that these file mode bits are not set by issuing

$ chmod g-w,o-w /path/to/authfile

We sincerely apologize for any inconvenience this may cause our users.

[LDVG]

FYI: We have released pam-u2f 1.3.2 to revert this breaking change; pam-u2f will instead log a warning message to syslog, alerting the system administrator about potentially unsafe permissions on the authfile. Again, we apologize for the inconvenience this caused you.