githubmirror/libuser

docs/libuser.conf.5.in
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Tomas Halman
Add documentation of allow_id_duplicates option
23 янв 2023, 19:10
23 янв 2023, 19:10888d305
'\" t
.\" A man page for libuser.conf -*- nroff -*-
.\" Copyright (C) 2005, 2008, 2010 Red Hat, Inc.
.\"
.\" This is free software; you can redistribute it and/or modify it under
.\" the terms of the GNU Library General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful, but
.\" WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
.\" General Public License for more details.
.\"
.\" You should have received a copy of the GNU Library General Public
.\" License along with this program; if not, write to the Free Software
.\" Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
.\"
.\" Author: Miloslav Trmac <mitr@redhat.com>
.TH libuser.conf 5 2010-02-08 libuser

.SH NAME
libuser.conf \- configuration for libuser and libuser utilities

.SH FILE FORMAT
.B libuser.conf
is a text file.
Leading and trailing white space on each line is ignored.
Lines starting with
.B #
are ignored.

The file defines variables grouped into sections.  Each section starts with
a section header:
.RS
\fB[\fIsection name\fB]\fR
.RE
A single section header can appear more than once in the file.

The lines following a section header define variables from that section:
.RS
.I variable
.B =
.I value
.RE
The
.I value
can be empty.

A
.I variable
can have more than one value, specified by using more than one line
defining that \fIvariable\fR.
All currently defined variables accept only the first value and ignore
the others, if any.

.SH \fB[defaults]\fR
.TP
.B create_modules
A list of module names to use when creating user or group entries,
unless the application specifies a different list.
The module names in the list can be separated using space, tab or comma.
Default value is \fBfiles shadow\fR.

.TP
.B crypt_style
The algorithm to use for password encryption when creating new passwords.
The current algorithm may be retained
when changing a password of an existing user, depending on the application.

Possible values are \fBdes\fR, \fBmd5\fR, \fBblowfish\fR,
.B sha256,
\fBsha512\fR, and \fByescrypt\fR, all case-insensitive.
Unrecognized values are treated as \fBdes\fR.
Default value is \fBdes\fR.

.TP
\fBhash_rounds_min\fR, \fBhash_rounds_max\fR
These variables specify an inclusive range of hash rounds used when
.B crypt_style
is
.B sha256
or \fBsha512\fR.
A number of hash rounds is chosen from this interval randomly.
A larger number of rounds makes password checking, and brute-force attempts
to guess the password by reversing the hash, more CPU-intensive.
The number of rounds is restricted to the interval [1000, 999999999].

If only one of the above variables is specified, the number of rounds used is
specified by the other variable.
If neither variable is specified, the number of rounds is chosen by \fBlibc\fR.

.TP
.B mailspooldir
The directory containing user's mail spool files.
Default value is \fB/var/mail\fR.

.TP
.B moduledir
The directory containing
.B libuser
modules.
Default value uses the modules installed with \fBlibuser\fR,
corresponding to the architecture of the
.B libuser
library,
e.g. \fB/usr/lib/libuser\fR or \fB/usr/lib64/libuser\fR
(assuming
.B libuser
was configured with \fB--prefix=/usr\fR).

.TP
.B modules
A list of module names to use when not creating user or group entries,
unless the application specifies a different list.
The module names in the list can be separated using space, tab or comma.
Default value is \fBfiles shadow\fR.

.TP
.B skeleton
The directory containing files to copy to newly created home directories.
Default value is \fB/etc/skel\fR.

.SH \fB[import]\fR
.TP
.B login_defs
A path to the
.I login.defs
file from \fBshadow\fR.
If this variable is defined,
the variables from the named file are used in place of some
.B libuser
variables.
Variables explicitly defined in
.I libuser.conf
are not affected by contents of \fIlogin.defs\fR.

The following variables are imported:
.TS
tab(,);
l|l
-|-
lb|lb.
Variable,Imported as
ENCRYPT_METHOD,defaults/crypt_style
GID_MIN,groupdefaults/LU_GIDNUMBER
MAIL_DIR,defaults/mailspooldir
MD5_CRYPT_ENAB,defaults/crypt_style
PASS_MAX_DAYS,userdefaults/LU_SHADOWMAX
PASS_MIN_DAYS,userdefaults/LU_SHADOWMIN
PASS_WARN_AGE,userdefaults/LU_SHADOWWARNING
SHA_CRYPT_MIN_ROUNDS,defaults/hash_rounds_min
SHA_CRYPT_MAX_ROUNDS,defaults/hash_rounds_max
UID_MIN,userdefaults/LU_UIDNUMBER
.TE

The following variables are
.I not
imported:
\fBCREATE_HOME\fR, \fBGID_MAX\fR, \fBMAIL_FILE\fR, \fBSYSLOG_SG_ENAB\fR,
\fBUID_MAX\fR, \fBUMASK\fR, \fBUSERDEL_CMD\fR, \fBUSERGROUPS_ENAB\fR

.TP
.B default_useradd
A path to the
.I default/useradd
file from
.B useradd
in \fBshadow\fR.
If this variable is defined,
the variables from the named file are used in place of some
.B libuser
variables.
Variables explicitly defined in
.I libuser.conf
are not affected by contents of \fIdefault/useradd\fR.

The following variables are imported:
.TS
tab(,);
l|l
-|-
lb|lb.
Variable,Imported as
EXPIRE,userdefaults/LU_SHADOWEXPIRE
GROUP,userdefaults/LU_GIDNUMBER
HOME,userdefaults/LU_HOMEDIRECTORY
INACTIVE,userdefaults/LU_SHADOWINACTIVE
SHELL,userdefaults/LU_LOGINSHELL
SKEL,defaults/skeleton
.TE

The
.B HOME
variable value has
.B /%n
appended to it before importing.

.SH \fB[userdefaults]\fR
This section defines attribute values of newly created user entities.
There is one special variable:

.TP
.B LU_UIDNUMBER
A decimal number, the first allowed UID value for regular users (not system
users).
Default value is \fB500\fR.

.P
All other variables have the same names as the attribute names from
\fB<libuser/entity.h>\fR and define attribute values.
Either the macro name (e.g. \fBLU_GECOS\fR)
or the macro content (e.g. \fBpw_gecos\fR)
can be used;
if both are used, the one appearing later in the configuration file
is used.

The
.B %
character in the value of the variable introduces an escape sequence:
.B %n
is replaced by the user name,
.B %d
is replaced by current date in days since the epoch,
.B %u
is replaced by the user's UID.
There is no way to escape the
.B %
character and avoid this substitution.

After the
.B userdefaults
section is processed, modules may define additional attributes
or even override the attributes defined in this section.

.SH \fB[groupdefaults]\fR
The
.B groupdefaults
section is similar to \fBuserdefaults\fR.
There is one special variable:

.TP
.B LU_GIDNUMBER
A decimal number, the first allowed GID value for regular groups (not system
groups).
Default value is \fB500\fR.

.P
The other variables follow the same rules as in the
.B userdefaults
section,
except that
.B %n
and
.B %u
are replaced by the group name and group's GID, respectively.

After the
.B groupdefaults
section is processed, modules may define additional attributes
or even override the attributes defined in this section.

.SH \fB[files]\fR
Configures the
.B files
module, which manages
.I /etc/group
and \fI/etc/passwd\fR.
The configuration variables are probably useful only for
.B libuser
development.

.TP
.B directory
The directory containing the
.I group
and
.I passwd
files.
Default value is \fB/etc\fR.

.TP
.B nonroot
Allow module initialization when not invoked as the
.B root
user if the value is \fByes\fR.

.TP
.B allow_id_duplicates
Allow to use duplicate uid/gid.The default value is \fBno\fR.

.SH \fB[shadow]\fR
Configures the
.B files
module, which manages
.I /etc/gshadow
and \fI/etc/shadow\fR.
The configuration variables are probably useful only for
.B libuser
development.

.TP
.B directory
The directory containing the
.I gshadow
and
.I shadow
files.
Default value is \fB/etc\fR.

.TP
.B nonroot
Allow module initialization when not invoked as the
.B root
user if the value is \fByes\fR.

.SH \fB[ldap]\fR
Configures the
.B ldap
module, which manages an user database accessible using LDAP.

.TP
.B userBranch
The LDAP suffix for user entities.
Default value is \fBou=People\fR.

.TP
.B groupBranch
The LDAP suffix for group entities.
Default value is \fBou=Group\fR.

.TP
.B server
A domain name or an URI of the LDAP server.
The URI can use the \fBldap\fR,
.B ldapi
or the
.B ldaps
protocol.
When a simple domain name is used,
the connection fails if TLS can not be used;
an URI using the
.B ldap
protocol allows connection without TLS.
TLS is never used with the
.B ldapi
protocol.
Default value is \fBldap\fR.

.TP
.B basedn
The base DN of the server.
Default value is \fBdc=example,dc=com\fR.

.TP
.B binddn
A DN for binding to the server.
If the value is empty or binding using this DN fails,
a DN of \fBuid=\fIuser\fR,\fIuserBranch\fR,\fIbasedn\fR is used, where
.I userBranch
and
.I basedn
are variables from this section
and
.I user
is the user name of the invoking user, unless overridden by the
.B user
variable from this section.
Default value is \fBcn=manager,dc=example,dc=com\fR.

.TP
.B user
The SASLv2 identity for authenticating to the LDAP server,
also overrides the user name for generating a bind DN.
Default value is the name of the invoking user.

.TP
.B password
The password used for a simple bind by default.  If not specified, there is
no default and the user must supply the password each time.

.B IT IS STRONGLY RECOMMENDED NOT TO STORE A PASSWORD IN THE SYSTEM-WIDE
.I @sysconfdir@/libuser.conf
.B FILE.
The configuration file is world-readable by default,
and setuid programs that prompt for a server name could be used
to send the password to an attacker-controlled server.

.TP
.B authuser
The SASLv2 authorization user, if non-empty.
Default value is empty.

.TP
.B bindtype
The list of bind types to use, separated by commas.
Allowed bind types are \fBsimple\fR, \fBsasl\fR, and \fBsasl/\fImechanism\fR,
where
.I mechanism
is a SASL mechanism.
The bind types (but not necessarily \fImechanism\fR) are case-insensitive.
If more than one bind type is specified, their relative order is ignored.
Default value is \fBsimple,sasl\fR.

.SH \fB[sasl]\fR
Configures the
.B sasl
module, which manages a SASLv2 user database.

.TP
.B appname
Name of the SASLv2 application.
Default value is empty.

.TP
.B domain
Domain used by libuser for the SASLv2 authentication object.
Default value is empty.

.SH BUGS
Invalid lines in the configuration file (or the imported
.B shadow
configuration files) are silently ignored.

.SH FILES
.TP
.I @sysconfdir@/libuser.conf
The default location of the configuration file. Can be overridden
by the
.I LIBUSER_CONF
environment variable, except in set-uid or set-gid programs.