coreos/coreos-cloudinit — pull request #57 by marineam (2014-04-01 05:30:57+00:00)
Title: fix(user): Use '*' as default password field rather than '!'

When using openssh without pam it checks for a ! prefix in the password
field, locking the account entirely if found. The other common lock
character, *, is allowed by ssh to login via ssh keys so use it instead.

Note: haven't actually tested this, it's time for bed so will do that tomorrow...