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Authentication
Arguments
The arguments are a list of tokens that are passed to the module when it is invoked. They
are much like arguments to a typical Linux shell command. Generally, valid arguments
are optional and are specific to any given module. Invalid arguments are ignored by a
module, however, when encountering an invalid argument, the module is required to
write an error to syslog(3).
The following are optional arguments which are likely to be understood by any module.
Arguments (including these) are in general, optional.
Arguments Description
debug Use the syslog(3) call to log debugging information to the system log
files.
no_warn Instruct module to not give warning messages to the application.
use_first_pass The module should not prompt the user for a password. Instead, it
should obtain the previously typed password (from the preceding auth
module), and use that. If that doesn’t work, then the user will not be
authenticated. (This option is intended for auth and password modules
only).
try_first_pass The module should attempt authentication with the previously typed
password (from the preceding auth module). If that doesn’t work, then
the user is prompted for a password. (This option is intended for auth
modules only).
use_mapped_
pass This argument is not currently supported by any of the modules in the
Linux-PAM distribution because of possible consequences associated
with U.S. encryption exporting restrictions.
Table 3.8: List of valid arguments to PAM