shadow/src/gpasswd.c
nekral-guest 6461841ccd * Merge two is_shadowgrp blocks.
* Indicate that we continue when *_unlock fail
2008-08-06 15:55:57 +00:00

1071 lines
27 KiB
C

/*
* Copyright (c) 1990 - 1994, 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 <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include "defines.h"
#include "exitcodes.h"
#include "groupio.h"
#include "nscd.h"
#include "prototypes.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif
/*
* Global variables
*/
/* The name of this command, as it is invoked */
static char *Prog;
#ifdef SHADOWGRP
/* Indicate if shadow groups are enabled on the system
* (/etc/gshadow present) */
static bool is_shadowgrp;
static bool gshadow_locked = false;
#endif
static bool group_locked = false;
/* Flags set by options */
static bool aflg = false;
static bool Aflg = false;
static bool dflg = false;
static bool Mflg = false;
static bool rflg = false;
static bool Rflg = false;
/* The name of the group that is being affected */
static char *group = NULL;
/* The name of the user being added (-a) or removed (-d) from group */
static char *user = NULL;
/* The new list of members set with -M */
static char *members = NULL;
#ifdef SHADOWGRP
/* The new list of group administrators set with -A */
static char *admins = NULL;
#endif
/* The name of the caller */
static char *myname = NULL;
/* The UID of the caller */
static uid_t bywho;
/* Indicate if gpasswd was called by root */
#define amroot (0 == bywho)
/* The number of retries for th user to provide and repeat a new password */
#ifndef RETRIES
#define RETRIES 3
#endif
/* local function prototypes */
static void usage (void);
static RETSIGTYPE catch_signals (int killed);
static void fail_exit (int status);
static bool is_valid_user_list (const char *users);
static void process_flags (int argc, char **argv);
static void check_flags (int argc, int opt_index);
static void open_files (void);
static void close_files (void);
#ifdef SHADOWGRP
static void get_group (struct group *gr, struct sgrp *sg);
static void check_perms (const struct group *gr, const struct sgrp *sg);
static void update_group (struct group *gr, struct sgrp *sg);
static void change_passwd (struct group *gr, struct sgrp *sg);
#else
static void get_group (struct group *gr);
static void check_perms (const struct group *gr);
static void update_group (struct group *gr);
static void change_passwd (struct group *gr);
#endif
/*
* usage - display usage message
*/
static void usage (void)
{
fprintf (stderr, _("Usage: %s [-r|-R] group\n"), Prog);
fprintf (stderr, _(" %s [-a user] group\n"), Prog);
fprintf (stderr, _(" %s [-d user] group\n"), Prog);
#ifdef SHADOWGRP
fprintf (stderr,
_(" %s [-A user,...] [-M user,...] group\n"), Prog);
#else
fprintf (stderr, _(" %s [-M user,...] group\n"), Prog);
#endif
exit (E_USAGE);
}
/*
* catch_signals - set or reset termio modes.
*
* catch_signals() is called before processing begins. signal() is then
* called with catch_signals() as the signal handler. If signal later
* calls catch_signals() with a signal number, the terminal modes are
* then reset.
*/
static RETSIGTYPE catch_signals (int killed)
{
static TERMIO sgtty;
if (0 != killed) {
STTY (0, &sgtty);
} else {
GTTY (0, &sgtty);
}
if (0 != killed) {
(void) putchar ('\n');
(void) fflush (stdout);
fail_exit (killed);
}
}
/*
* fail_exit - undo as much as possible
*/
static void fail_exit (int status)
{
if (group_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: cannot unlock the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot unlock the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"unlocking group file",
group, AUDIT_NO_ID, 0);
#endif
}
}
#ifdef SHADOWGRP
if (gshadow_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: cannot unlock the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot unlock the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"unlocking gshadow file",
group, AUDIT_NO_ID, 0);
#endif
}
}
#endif
exit (status);
}
/*
* is_valid_user_list - check a comma-separated list of user names for validity
*
* is_valid_user_list scans a comma-separated list of user names and
* checks that each listed name exists is the user database.
*
* It returns true if the list of users is valid.
*/
static bool is_valid_user_list (const char *users)
{
const char *start, *end;
char username[32];
bool valid = true;
size_t len;
for (start = users; (NULL != start) && ('\0' != *start); start = end) {
end = strchr (start, ',');
if (NULL != end) {
len = (size_t) (end - start);
end++;
} else {
len = strlen (start);
}
if (len > sizeof (username) - 1) {
len = sizeof (username) - 1;
}
strncpy (username, start, len);
username[len] = '\0';
/*
* This user must exist.
*/
/* local, no need for xgetpwnam */
if (getpwnam (username) == NULL) {
fprintf (stderr, _("%s: user '%s' does not exist\n"),
Prog, username);
valid = false;
}
}
return valid;
}
static void failure (void)
{
fprintf (stderr, _("%s: Permission denied.\n"), Prog);
fail_exit (1);
}
/*
* process_flags - process the command line options and arguments
*/
static void process_flags (int argc, char **argv)
{
int flag;
while ((flag = getopt (argc, argv, "a:A:d:gM:rR")) != EOF) {
switch (flag) {
case 'a': /* add a user */
user = optarg;
/* local, no need for xgetpwnam */
if (getpwnam (user) == NULL) {
fprintf (stderr,
_("%s: user '%s' does not exist\n"), Prog,
user);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding to group",
user, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
aflg = true;
break;
#ifdef SHADOWGRP
case 'A':
if (!amroot) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"Listing administrators",
NULL, (unsigned int) bywho, 0);
#endif
failure ();
}
if (!is_shadowgrp) {
fprintf (stderr,
_("%s: shadow group passwords required for -A\n"),
Prog);
fail_exit (2);
}
admins = optarg;
if (!is_valid_user_list (admins)) {
fail_exit (1);
}
Aflg = true;
break;
#endif
case 'd': /* delete a user */
dflg = true;
user = optarg;
break;
case 'g': /* no-op from normal password */
break;
case 'M':
if (!amroot) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"listing members",
NULL, (unsigned int) bywho, 0);
#endif
failure ();
}
members = optarg;
if (!is_valid_user_list (members)) {
fail_exit (1);
}
Mflg = true;
break;
case 'r': /* remove group password */
rflg = true;
break;
case 'R': /* restrict group password */
Rflg = true;
break;
default:
usage ();
}
}
/* Get the name of the group that is being affected. */
group = argv[optind];
check_flags (argc, optind);
}
/*
* check_flags - check the validity of options
*/
static void check_flags (int argc, int opt_index)
{
int exclusive = 0;
/*
* Make sure exclusive flags are exclusive
*/
if (aflg) {
exclusive++;
}
if (dflg) {
exclusive++;
}
if (rflg) {
exclusive++;
}
if (Rflg) {
exclusive++;
}
if (Aflg || Mflg) {
exclusive++;
}
if (exclusive > 1) {
usage ();
}
/*
* Make sure one (and only one) group was provided
*/
if ((argc != (opt_index+1)) || (NULL == group)) {
usage ();
}
}
/*
* open_files - lock and open the group databases
*
* It will call exit in case of error.
*/
static void open_files (void)
{
if (gr_lock () == 0) {
fprintf (stderr, _("%s: cannot lock the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot lock the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"locking /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
group_locked = true;
#ifdef SHADOWGRP
if (is_shadowgrp) {
if (sgr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot lock the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"locking /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
gshadow_locked = true;
}
#endif
if (gr_open (O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot open the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"opening /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#ifdef SHADOWGRP
if (is_shadowgrp && (sgr_open (O_RDWR) == 0)) {
fprintf (stderr, _("%s: cannot open the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot open the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"opening /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#endif
}
/*
* close_files - close and unlock the group databases
*
* This cause any changes in the databases to be committed.
*
* It will call exit in case of error.
*/
static void close_files (void)
{
if (gr_close () == 0) {
fprintf (stderr, _("%s: cannot rewrite the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot rewrite the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"rewriting /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#ifdef SHADOWGRP
if (is_shadowgrp) {
if (sgr_close () == 0) {
fprintf (stderr, _("%s: cannot rewrite the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot rewrite the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"rewriting /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: cannot unlock the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot unlock the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"unlocking gshadow file",
group, AUDIT_NO_ID, 0);
#endif
/* continue */
}
gshadow_locked = false;
}
#endif
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: cannot unlock the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot unlock the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"unlocking group file",
group, AUDIT_NO_ID, 0);
#endif
/* continue */
}
group_locked = false;
}
/*
* check_perms - check if the user is allowed to change the password of
* the specified group.
*
* It only returns if the user is allowed.
*/
#ifdef SHADOWGRP
static void check_perms (const struct group *gr, const struct sgrp *sg)
#else
static void check_perms (const struct group *gr)
#endif
{
#ifdef SHADOWGRP
if (is_shadowgrp) {
/*
* The policy here for changing a group is that
* 1) you must be root or
* 2) you must be listed as an administrative member.
* Administrative members can do anything to a group that
* the root user can.
*/
if (!amroot && !is_on_list (sg->sg_adm, myname)) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modify group",
group, AUDIT_NO_ID, 0);
#endif
failure ();
}
} else
#endif /* ! SHADOWGRP */
{
#ifdef FIRST_MEMBER_IS_ADMIN
/*
* The policy here for changing a group is that
* 1) you must be root or
* 2) you must be the first listed member of the group.
* The first listed member of a group can do anything to
* that group that the root user can. The rationale for
* this hack is that the FIRST user is probably the most
* important user in this entire group.
*
* This feature enabled by default could be a security
* problem when installed on existing systems where the
* first group member might be just a normal user.
* --marekm
*/
if (!amroot) {
if (gr->gr_mem[0] == (char *) 0) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying group",
group, AUDIT_NO_ID, 0);
#endif
failure ();
}
if (strcmp (gr->gr_mem[0], myname) != 0) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying group",
myname, AUDIT_NO_ID, 0);
#endif
failure ();
}
}
#else /* ! FIRST_MEMBER_IS_ADMIN */
if (!amroot) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying group",
group, AUDIT_NO_ID, 0);
#endif
failure ();
}
#endif
}
}
/*
* update_group - Update the group information in the databases
*/
#ifdef SHADOWGRP
static void update_group (struct group *gr, struct sgrp *sg)
#else
static void update_group (struct group *gr)
#endif
{
if (gr_update (gr) == 0) {
fprintf (stderr, _("%s: cannot update the entry of '%s' in the group file\n"), Prog, gr->gr_name);
SYSLOG ((LOG_WARN, "cannot update the entry of '%s' in the group file", gr->gr_name));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"updating /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#ifdef SHADOWGRP
if (is_shadowgrp && (sgr_update (sg) == 0)) {
fprintf (stderr, _("%s: cannot update the entry of '%s' in the shadow group file\n"), Prog, sg->sg_name);
SYSLOG ((LOG_WARN, "cannot update the entry of '%s' in the shadow group file", sg->sg_name));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"updating /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#endif
}
/*
* get_group - get the current information for the group
*
* The information are copied in group structure(s) so that they can be
* modified later.
*
* Note: If !is_shadowgrp, *sg will not be initialized.
*/
#ifdef SHADOWGRP
static void get_group (struct group *gr, struct sgrp *sg)
#else
static void get_group (struct group *gr)
#endif
{
struct group const*tmpgr = NULL;
struct sgrp const*tmpsg = NULL;
if (gr_open (O_RDONLY) == 0) {
fprintf (stderr, _("%s: cannot open the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot open the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"opening /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
tmpgr = gr_locate (group);
if (NULL == tmpgr) {
fprintf (stderr, _("%s: group '%s' does not exist in the group file\n"), Prog, group);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"group lookup",
group, AUDIT_NO_ID, 0);
#endif
failure ();
}
*gr = *tmpgr;
gr->gr_name = xstrdup (tmpgr->gr_name);
gr->gr_passwd = xstrdup (tmpgr->gr_passwd);
gr->gr_mem = dup_list (tmpgr->gr_mem);
if (gr_close () == 0) {
fprintf (stderr, _("%s: cannot rewrite the group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot rewrite the group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"closing /etc/group",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#ifdef SHADOWGRP
if (is_shadowgrp) {
if (sgr_open (O_RDONLY) == 0) {
fprintf (stderr,
_("%s: cannot open the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot open the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"opening /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
tmpsg = sgr_locate (group);
if (NULL != tmpsg) {
*sg = *tmpsg;
sg->sg_name = xstrdup (tmpsg->sg_name);
sg->sg_passwd = xstrdup (tmpsg->sg_passwd);
sg->sg_mem = dup_list (tmpsg->sg_mem);
sg->sg_adm = dup_list (tmpsg->sg_adm);
} else {
sg->sg_name = xstrdup (group);
sg->sg_passwd = gr->gr_passwd;
gr->gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
sg->sg_mem = dup_list (gr->gr_mem);
sg->sg_adm = (char **) xmalloc (sizeof (char *) * 2);
#ifdef FIRST_MEMBER_IS_ADMIN
if (sg->sg_mem[0]) {
sg->sg_adm[0] = xstrdup (sg->sg_mem[0]);
sg->sg_adm[1] = NULL;
} else
#endif
{
sg->sg_adm[0] = NULL;
}
}
if (sgr_close () == 0) {
fprintf (stderr,
_("%s: cannot rewrite the shadow group file\n"), Prog);
SYSLOG ((LOG_WARN, "cannot rewrite the shadow group file"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"closing /etc/gshadow",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
}
#endif /* SHADOWGRP */
}
/*
* change_passwd - change the group's password
*
* Get the new password from the user and update the password in the
* group's structure.
*
* It will call exit in case of error.
*/
#ifdef SHADOWGRP
static void change_passwd (struct group *gr, struct sgrp *sg)
#else
static void change_passwd (struct group *gr)
#endif
{
char *cp;
static char pass[BUFSIZ];
int retries;
/*
* A new password is to be entered and it must be encrypted, etc.
* The password will be prompted for twice, and both entries must be
* identical. There is no need to validate the old password since
* the invoker is either the group owner, or root.
*/
printf (_("Changing the password for group %s\n"), group);
for (retries = 0; retries < RETRIES; retries++) {
cp = getpass (_("New Password: "));
if (NULL == cp) {
fail_exit (1);
}
STRFCPY (pass, cp);
strzero (cp);
cp = getpass (_("Re-enter new password: "));
if (NULL == cp) {
fail_exit (1);
}
if (strcmp (pass, cp) == 0) {
strzero (cp);
break;
}
strzero (cp);
memzero (pass, sizeof pass);
if (retries + 1 < RETRIES) {
puts (_("They don't match; try again"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing password",
group, AUDIT_NO_ID, 0);
#endif
}
}
if (retries == RETRIES) {
fprintf (stderr, _("%s: Try again later\n"), Prog);
fail_exit (1);
}
cp = pw_encrypt (pass, crypt_make_salt (NULL, NULL));
memzero (pass, sizeof pass);
#ifdef SHADOWGRP
if (is_shadowgrp) {
sg->sg_passwd = cp;
} else
#endif
{
gr->gr_passwd = cp;
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing password",
group, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "change the password for group %s by %s", group,
myname));
}
/*
* gpasswd - administer the /etc/group file
*
* -a user add user to the named group
* -d user remove user from the named group
* -r remove password from the named group
* -R restrict access to the named group
* -A user,... make list of users the administrative users
* -M user,... make list of users the group members
*/
int main (int argc, char **argv)
{
struct group grent;
#ifdef SHADOWGRP
struct sgrp sgent;
#endif
struct passwd *pw = NULL;
#ifdef WITH_AUDIT
audit_help_open ();
#endif
sanitize_env ();
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
/*
* Make a note of whether or not this command was invoked by root.
* This will be used to bypass certain checks later on. Also, set
* the real user ID to match the effective user ID. This will
* prevent the invoker from issuing signals which would interfer
* with this command.
*/
bywho = getuid ();
Prog = Basename (argv[0]);
OPENLOG ("gpasswd");
setbuf (stdout, NULL);
setbuf (stderr, NULL);
#ifdef SHADOWGRP
is_shadowgrp = sgr_file_present ();
#endif
/* Parse the options */
process_flags (argc, argv);
/*
* Determine the name of the user that invoked this command. This
* is really hit or miss because there are so many ways that command
* can be executed and so many ways to trip up the routines that
* report the user name.
*/
pw = get_my_pwent ();
if (NULL == pw) {
fputs (_("Who are you?\n"), stderr);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"user lookup",
NULL, (unsigned int) bywho, 0);
#endif
failure ();
}
myname = xstrdup (pw->pw_name);
/*
* Replicate the group so it can be modified later on.
*/
#ifdef SHADOWGRP
get_group (&grent, &sgent);
#else
get_group (&grent);
#endif
/*
* Check if the user is allowed to change the password of this group.
*/
#ifdef SHADOWGRP
check_perms (&grent, &sgent);
#else
check_perms (&grent);
#endif
/*
* Removing a password is straight forward. Just set the password
* field to a "".
*/
if (rflg) {
grent.gr_passwd = ""; /* XXX warning: const */
#ifdef SHADOWGRP
sgent.sg_passwd = ""; /* XXX warning: const */
#endif
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"deleting group password",
group, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "remove password from group %s by %s",
group, myname));
goto output;
} else if (Rflg) {
/*
* Same thing for restricting the group. Set the password
* field to "!".
*/
grent.gr_passwd = "!"; /* XXX warning: const */
#ifdef SHADOWGRP
sgent.sg_passwd = "!"; /* XXX warning: const */
#endif
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"restrict access to group",
group, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "restrict access to group %s by %s",
group, myname));
goto output;
}
/*
* Adding a member to a member list is pretty straightforward as
* well. Call the appropriate routine and split.
*/
if (aflg) {
printf (_("Adding user %s to group %s\n"), user, group);
grent.gr_mem = add_list (grent.gr_mem, user);
#ifdef SHADOWGRP
if (is_shadowgrp) {
sgent.sg_mem = add_list (sgent.sg_mem, user);
}
#endif
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"adding group member",
user, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "add member %s to group %s by %s", user,
group, myname));
goto output;
}
/*
* Removing a member from the member list is the same deal as adding
* one, except the routine is different.
*/
if (dflg) {
bool removed = false;
printf (_("Removing user %s from group %s\n"), user, group);
if (is_on_list (grent.gr_mem, user)) {
removed = true;
grent.gr_mem = del_list (grent.gr_mem, user);
}
#ifdef SHADOWGRP
if (is_shadowgrp) {
if (is_on_list (sgent.sg_mem, user)) {
removed = true;
sgent.sg_mem = del_list (sgent.sg_mem, user);
}
}
#endif
if (!removed) {
fprintf (stderr, _("%s: user '%s' is not a member of '%s'\n"),
Prog, user, group);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"deleting member",
user, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"deleting member",
user, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "remove member %s from group %s by %s",
user, group, myname));
goto output;
}
#ifdef SHADOWGRP
/*
* Replacing the entire list of administrators is simple. Check the
* list to make sure everyone is a real user. Then slap the new list
* in place.
*/
if (Aflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"setting group admin",
group, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "set administrators of %s to %s",
group, admins));
sgent.sg_adm = comma_to_list (admins);
if (!Mflg) {
goto output;
}
}
#endif
/*
* Replacing the entire list of members is simple. Check the list to
* make sure everyone is a real user. Then slap the new list in
* place.
*/
if (Mflg) {
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"setting group members",
group, AUDIT_NO_ID, 1);
#endif
SYSLOG ((LOG_INFO, "set members of %s to %s", group, members));
#ifdef SHADOWGRP
sgent.sg_mem = comma_to_list (members);
#endif
grent.gr_mem = comma_to_list (members);
goto output;
}
/*
* If the password is being changed, the input and output must both
* be a tty. The typical keyboard signals are caught so the termio
* modes can be restored.
*/
if ((isatty (0) == 0) || (isatty (1) == 0)) {
fprintf (stderr, _("%s: Not a tty\n"), Prog);
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing password",
group, AUDIT_NO_ID, 0);
#endif
fail_exit (1);
}
catch_signals (0); /* save tty modes */
(void) signal (SIGHUP, catch_signals);
(void) signal (SIGINT, catch_signals);
(void) signal (SIGQUIT, catch_signals);
(void) signal (SIGTERM, catch_signals);
#ifdef SIGTSTP
(void) signal (SIGTSTP, catch_signals);
#endif
/* Prompt for the new password */
#ifdef SHADOWGRP
change_passwd (&grent, &sgent);
#else
change_passwd (&grent);
#endif
/*
* This is the common arrival point to output the new group file.
* The freshly crafted entry is in allocated space. The group file
* will be locked and opened for writing. The new entry will be
* output, etc.
*/
output:
if (setuid (0) != 0) {
fputs (_("Cannot change ID to root.\n"), stderr);
SYSLOG ((LOG_ERR, "can't setuid(0)"));
#ifdef WITH_AUDIT
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"changing id to root",
group, AUDIT_NO_ID, 0);
#endif
closelog ();
fail_exit (1);
}
pwd_init ();
open_files ();
#ifdef SHADOWGRP
update_group (&grent, &sgent);
#else
update_group (&grent);
#endif
close_files ();
nscd_flush_cache ("group");
exit (E_SUCCESS);
}