| debug | syslog(3) debugging information at LOG_DEBUG level. |
| use_first_pass | If the authentication module is not the first in the stack, and a previous module obtained the user’s password, that password is used to authenticate the user. If this fails, the authentication module returns failure without prompting the user for a password. This option has no effect if the authentication module is the first in the stack, or if no previous modules obtained the user’s password. |
| try_first_pass | This option is similar to the use_first_pass option, except that if the previously obtained password fails, the user is prompted for another password. |
| auth_as_self | This option will require the user to authenticate himself as the user given by getlogin(2), not as the account they are attempting to access. This is primarily for services like su(1), where the user’s ability to retype their own password might be deemed sufficient. |
| nullok | If the password database has no password for the entity being authenticated, then this option will forgo password prompting, and silently allow authentication to succeed. |
| local_pass | Use only the local password database, even if NIS is in use. This will cause an authentication failure if the system is configured to only use NIS. |
| nis_pass | Use only the NIS password database. This will cause an authentication failure if the system is not configured to use NIS. |
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