Provided by: usermode_1.114-3_amd64 
NAME
userhelper - A helper interface to PAM.
SYNOPSIS
userhelper [ -t ] [ -w prog args ] [ -c ] [ -f full-name ] [ -o office ] [ -p office-
phone ] [ -h home-phone ] [ -s shell ] [ username ]
DESCRIPTION
NOTE this program is NOT intended to be run interactively. If you want to change this
information on the command line use passwd(1), chfn(1), or chsh(1).
This program provides a basic interface to change a user's password, gecos information,
and shell. The main difference between this program and its traditional equivalents is
that prompts are written to standard out to make it easy for a GUI wrapper to interface to
it as a child process.
The output is in the form of:
<number> <string>
Where the number is the type of prompt returned from libpam, and the string is the prompt
to give the user.
The prompt numbers are as follows:
1 Prompt with visible input.
2 Prompt with invisible input.
3 Suggested answer for the current prompt.
4 Informational message.
5 Error message.
6 Count of messages sent in this block so far.
7 The name of the service being used.
8 Whether or not the command will be executed as the user if authentication fails.
9 The name of the user being authenticated.
OPTIONS
-t Use text mode authentication instead of the numbered message types just described;
only used with -w.
-w Specify a program name to be run and arguments to be passed to it. userhelper will
look in the file /etc/security/console.apps/programname for the name of a user to
authenticate, the path of the binary to be run, and other settings described below.
userhelper will then attempt to authenticate the user using PAM, specifying
programname as the PAM service name. If authentication succeeds, the binary will
be run with superuser privileges. If the configuration file specifies that PAM
session management should be performed, userhelper will also open a PAM session
before starting the program, and close the session when the program terminates. If
authentication fails, userhelper can be configured run the program with the user's
privileges instead.
-c Change the current user's password. Note that this option cannot be used with any
of the other options. This is due to the limitation in the interface to libpam.
-f Specify a new Full Name.
-o Specify a new Office.
-p Specify a new Office Phone.
-h Specify a new Home Phone.
-s Specify a new shell.
WRAPPER CONFIGURATION
The wrapper configuration file used with -w contains variable assignments and file
inclusions.
A file inclusion line has the following form:
. path
(that is a dot and a space, followed by path). If path is relative, it is interpreted
relative to the directory containing the current file. The file inclusion line is
interpreted by inserting contents of path to the current file. Nested file inclusions are
possible, recursive file inclusion results in undefined behavior.
A variable assignment line has the following form:
name=value
No additional white space is allowed. If value is surrounded by a matching pair of " or '
quotes, the quotes are removed; otherwise, the \ characters are removed, except that \\ is
replaced by a single \.
The following variables are recognized:
USER The name of the user userhelper should attempt to authenticate the invoking user
as. Typically this is root. The special value <user> (which is also the default)
indicates that userhelper should authenticate the invoking user.
The special value <none> indicates that access should be denied; when used in
conjunction with UGROUPS, members of the given groups can authenticate but all
others are given an Insufficient Rights message.
UGROUPS
A comma-separated list of groups whose members will be authenticated as if USER
were set to the special value <user>. If the invoking user is not a member of one
of these groups, the name defined in USER will be used as normal. For example,
setting UGROUPS to wheel and USER to root allows members of wheel (traditionally
used for administrative privileges) to authenticate with their own credentials and
requires other users to provide the root password.
PROGRAM
The name of the binary to execute if authentication succeeds. This should always
be specified as an absolute path. If not specified, userhelper will attempt to run
/sbin/programname first, and failing that, it will attempt to run
/usr/sbin/programname.
SESSION
Specifies whether or not userhelper should perform PAM session management when
running the program. Typically this is needed if the PAM configuration uses a
module such as pam_xauth.so to forward X11 authentication tokens for use by the
program. Valid values are yes and no, with the default being no.
KEEP_ENV_VARS
A comma-separated list of names of environment variables that should be kept in the
environment of the wrapped program. The environment is cleared by default and only
a few selected variables are kept in the environment if they do not contain any
potentially dangerous substrings.
RETRY Specifies the number of times userhelper should attempt to authenticate the user if
the initial attempt fails. The default value is 2, which causes userhelper to
attempt to authenticate the user a total of 3 times.
FALLBACK
Specifies whether or not the specified binary should be run with the invoking
user's privileges if authentication fails. This option is useful for running
applications which gain additional abilities when run with superuser privileges,
but which are still useful when run without them.
NOXOPTION
The name of an option which, if passed to userhelper as an argument for the program
it will run, will cause userhelper to behave as if the -t flag had been passed to
it.
GUI Specifies whether or not userhelper should use consolehelper to present graphical
dialog boxes when prompting the user for information. This is the inverse of the
-t option. Valid values are yes and no, with the default being yes.
BANNER Specifies specific text which userhelper should present to the user when userhelper
prompts for information. The default is a generic message based on the PAM service
name.
BANNER_DOMAIN
Specifies the text domain in which translations of the banner are stored. This
setting is deprecated in favor of the DOMAIN setting.
DOMAIN Specifies the text domain in which translations of strings are stored. If this
setting is specified, it overrides any setting for BANNER_DOMAIN which may also be
set.
STARTUP_NOTIFICATION_NAME
Specifies the startup notification name used for startup notification.
STARTUP_NOTIFICATION_DESCRIPTION
Specifies the startup notification name used for startup notification.
STARTUP_NOTIFICATION_WORKSPACE
Specifies the startup notification workspace used for startup notification.
STARTUP_NOTIFICATION_WMCLASS
Specifies the startup notification binary wmclass used for startup notification.
STARTUP_NOTIFICATION_BINARY_NAME
Specifies the startup notification binary name used for startup notification.
STARTUP_NOTIFICATION_ICON_NAME
Specifies the startup notification icon name used for startup notification.
EXIT STATUS
A non-zero exit status indicates an error occurred. Those errors are:
1 The authentication passwords was incorrect.
2 One or more of the GECOS fields is invalid. This occurs when there is a colon
supplied in one of the fields.
3 Password resetting error.
4 Some system files are locked.
5 User unknown.
6 Insufficient rights.
7 Invalid call to this program.
8 The shell provided is not valid (i.e., does not exist in /etc/shells).
9 Ran out of memory.
10 Could not find the program.
11 Executing the program failed even though it exists.
12 The user canceled the operation.
255 Unknown error.
FILES
/etc/passwd The gecos and shell information is stored in this file.
/etc/shells This file is checked to see if the new shell supplied is valid.
/etc/security/console.apps/prog
This file contains the values which will be used for the
variables when userhelper is used with the -w flag.
/etc/pam.d/prog This file contains the PAM configuration used when userhelper is
used with the -w flag.
SEE ALSO
userpasswd(1), userinfo(1), consolehelper(8), chfn(1), chsh(1), passwd(5)
AUTHOR
Otto Hammersmith <otto@redhat.com>
Michael K. Johnson <johnsonm@redhat.com>