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uid.pl
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: [email protected]
WWW: http://www.swi-prolog.org
Copyright (C): 2011, VU University Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU 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 General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(uid,
[ getuid/1, % -UID
getgid/1, % -GID
geteuid/1, % -UID
getegid/1, % -GID
user_info/2, % +User, -UserInfo
group_info/2, % +Group, -GroupInfo
user_data/3, % +Field, +UserInfo, -Value
group_data/3, % +Field, +GroupInfo, -Value
setuid/1, % +UID
setgid/1, % +GID
seteuid/1, % +UID
setegid/1, % +GID
set_user_and_group/1, % +User
set_user_and_group/2 % +User, +Group
]).
:- use_foreign_library(foreign(uid)).
/** <module> User and group management on Unix systems
@ingroup SWIclib
This module provides and interface to user and group information on
Posix systems. In addition, it allows for changing user and group ids.
@see Please check the documentation of your OS for details on the
semantics of this predicates.
*/
%% getuid(-UID) is det.
%
% UID is the real user ID of the calling process.
%% getgid(-GID) is det.
%
% GID is the real group ID of the calling process.
%% geteuid(-UID) is det.
%
% UID is the effective user ID of the calling process.
%% getegid(-GID) is det.
%
% GID is the effective group ID of the calling process.
%% user_info(+User, -UserData) is det.
%
% UserData represent the passwd information for User. User is
% either a numeric UID or a user name. The predicate user_data/3
% can be used to extract information from UserData.
%% user_data(?Field, ?UserData, ?Value)
%
% Value is the value for Field in UserData. Defined fields are:
%
% * name
% Name of the user
% * password
% Password hash of the user (or =x= if this is not accessible)
% * uid
% Numeric user id of the user
% * gid
% Numeric primary group id of the user
% * comment
% The _gecos_ field
% * home
% Home directory of the user
% * shell
% Default (login) shell of the user.
user_data(name, user_info(Nam, _, _, _, _, _, _), Nam).
user_data(password, user_info(_, PWD, _, _, _, _, _), PWD).
user_data(uid, user_info(_, _, UID, _, _, _, _), UID).
user_data(gid, user_info(_, _, _, GID, _, _, _), GID).
user_data(comment, user_info(_, _, _, _, GEC, _, _), GEC).
user_data(home, user_info(_, _, _, _, _, HOM, _), HOM).
user_data(shell, user_info(_, _, _, _, _, _, SHE), SHE).
%% group_info(+Group, -GroupData) is det.
%
% GroupData represent the group information for Group. Group is
% either a numeric GID or a group name. The predicate group_data/3
% can be used to extract information from GroupData.
%% group_data(?Field, ?GroupData, ?Value)
%
% Value is the value for Field GroupData. Defined fields are:
%
% * name
% Name of the user
% * password
% Password hash of the user (or =x= if this is not accessible)
% * gid
% Numeric group id of the group
% * members
% List of user-names that are member of this group.
group_data(name, group_info(Nam, _, _, _), Nam).
group_data(password, group_info(_, PWD, _, _), PWD).
group_data(gid, group_info(_, _, GID, _), GID).
group_data(members, group_info(_, _, _, MBR), MBR).
/*******************************
* SETTING *
*******************************/
%% setuid(+UID)
%
% Set the user id of the calling process.
%% seteuid(+UID)
%
% Set the effective user id of the calling process.
%% setgid(+GID)
%
% Set the group id of the calling process.
%% setegid(+GID)
%
% Set the effective group id of the calling process.
%% set_user_and_group(+User) is det.
%% set_user_and_group(+User, +Group) is det.
%
% Set the UID and GID to the User. User is either a UID or a user
% name. If Group is not specified, the primary group of User is
% used.
set_user_and_group(User) :-
user_info(User, Data),
user_data(uid, Data, UID),
user_data(gid, Data, GID),
setgid(GID),
setuid(UID).
set_user_and_group(User, Group) :-
user_info(User, Data),
group_info(Group, GData),
user_data(uid, Data, UID),
group_data(gid, GData, GID),
setgid(GID),
setuid(UID).