shadow/src/groups.c

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/*
* Copyright (c) 1991 - 1993, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2001 - 2006, Tomasz Kłoczko
* Copyright (c) 2007 - 2008, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#ident "$Id$"
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include "defines.h"
#include "prototypes.h"
/*
* Global variables
*/
static char *Prog;
/* local function prototypes */
static void print_groups (const char *member);
/*
* print_groups - print the groups which the named user is a member of
*
* print_groups() scans the groups file for the list of groups which
* the user is listed as being a member of.
*/
static void print_groups (const char *member)
{
int groups = 0;
struct group *grp;
struct passwd *pwd;
bool flag = false;
pwd = getpwnam (member); /* local, no need for xgetpwnam */
if (NULL == pwd) {
(void) fprintf (stderr, _("%s: unknown user %s\n"),
Prog, member);
exit (1);
}
setgrent ();
while ((grp = getgrent ()) != NULL) {
if (is_on_list (grp->gr_mem, member)) {
if (0 != groups) {
(void) putchar (' ');
}
groups++;
(void) printf ("%s", grp->gr_name);
if (grp->gr_gid == pwd->pw_gid) {
flag = true;
}
}
}
endgrent ();
/* The user may not be in the list of members of its primary group */
if (!flag) {
grp = getgrgid (pwd->pw_gid); /* local, no need for xgetgrgid */
if (NULL != grp) {
if (0 != groups) {
(void) putchar (' ');
}
groups++;
(void) printf ("%s", grp->gr_name);
}
}
if (0 != groups) {
(void) putchar ('\n');
}
}
/*
* groups - print out the groups a process is a member of
*/
int main (int argc, char **argv)
{
#ifdef HAVE_GETGROUPS
long sys_ngroups;
int ngroups;
GETGROUPS_T *groups;
int pri_grp; /* TODO: should be GETGROUPS_T */
int i;
#else
char *logname;
char *getlogin ();
#endif
#ifdef HAVE_GETGROUPS
sys_ngroups = sysconf (_SC_NGROUPS_MAX);
groups = (GETGROUPS_T *) malloc (sizeof (GETGROUPS_T) * sys_ngroups);
#endif
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
/*
* Get the program name so that error messages can use it.
*/
Prog = Basename (argv[0]);
if (argc == 1) {
/*
* Called with no arguments - give the group set for the
* current user.
*/
#ifdef HAVE_GETGROUPS
/*
* This system supports concurrent group sets, so I can ask
* the system to tell me which groups are currently set for
* this process.
*/
ngroups = getgroups (sys_ngroups, groups);
if (ngroups < 0) {
perror ("getgroups");
exit (1);
}
/*
* The groupset includes the primary group as well.
*/
pri_grp = getegid ();
for (i = 0; i < ngroups; i++) {
if (pri_grp == (int) groups[i]) {
break;
}
}
if (i != ngroups) {
pri_grp = -1;
}
/*
* Print out the name of every group in the current group
* set. Unknown groups are printed as their decimal group ID
* values.
*/
if (-1 != pri_grp) {
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
2007-11-19 04:45:26 +05:30
struct group *gr;
/* local, no need for xgetgrgid */
gr = getgrgid (pri_grp);
if (NULL != gr) {
(void) printf ("%s", gr->gr_name);
} else {
(void) printf ("%d", pri_grp);
}
}
for (i = 0; i < ngroups; i++) {
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
2007-11-19 04:45:26 +05:30
struct group *gr;
if ((0 != i) || (-1 != pri_grp)) {
(void) putchar (' ');
}
* lib/prototypes.h, configure.in, libmisc/Makefile.am, libmisc/xgetXXbyYY.c, libmisc/xgetpwnam.c, libmisc/xgetpwuid.c, libmisc/xgetgrnam.c, libmisc/xgetgrgid.c, libmisc/xgetspnam.c: Added functions xgetpwnam(), xgetpwuid(), xgetgrnam(), xgetgrgid(), and xgetspnam(). They allocate memory for the returned structure and are more robust to successive calls. They are implemented with the libc's getxxyyy_r() functions if available. * libmisc/limits.c, libmisc/entry.c, libmisc/chowntty.c, libmisc/addgrps.c, libmisc/myname.c, libmisc/rlogin.c, libmisc/pwdcheck.c, src/newgrp.c, src/login_nopam.c, src/userdel.c, src/lastlog.c, src/grpck.c, src/gpasswd.c, src/newusers.c, src/chpasswd.c, src/chfn.c, src/groupmems.c, src/usermod.c, src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/su.c, src/useradd.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/groupadd.c, src/chage.c, src/login.c, src/suauth.c, src/faillog.c, src/groups.c, src/chsh.c, src/id.c: Review all the usage of one of the getpwnam(), getpwuid(), getgrnam(), getgrgid(), and getspnam() functions. It was noticed on http://bugs.debian.org/341230 that chfn and chsh use a passwd structure after calling a pam function, which result in using information from the passwd structure requested by pam, not the original one. It is much easier to use the new xget... functions to avoid these issues. I've checked which call to the original get... functions could be left (reducing the scope of the structure if possible), and I've left comments to ease future reviews (e.g. /* local, no need for xgetpwnam */). Note: the getpwent/getgrent calls should probably be checked also. * src/groupdel.c, src/expiry.c: Fix typos in comments. * src/groupmod.c: Re-indent. * libmisc/Makefile.am, lib/groupmem.c, lib/groupio.c, lib/pwmem.c, lib/pwio.c, lib/shadowmem.c, lib/shadowio.c: Move the __<xx>_dup functions (used by the xget... functions) from the <xx>io.c files to the new <xx>mem.c files. This avoid linking some utils against the SELinux library.
2007-11-19 04:45:26 +05:30
/* local, no need for xgetgrgid */
gr = getgrgid (groups[i]);
if (NULL != gr) {
(void) printf ("%s", gr->gr_name);
} else {
(void) printf ("%ld", (long) groups[i]);
}
}
(void) putchar ('\n');
#else
/*
* This system does not have the getgroups() system call, so
* I must check the groups file directly.
*/
logname = getlogin ();
if (NULL != logname) {
print_groups (logname);
} else {
exit (1);
}
#endif
} else {
/*
* The invoker wanted to know about some other user. Use
* that name to look up the groups instead.
*/
print_groups (argv[1]);
}
exit (0);
}