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shadow/src/grpck.c

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/*
* Copyright 1992 - 1994, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH 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 JULIE HAUGH 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: grpck.c,v 1.28 2005/09/07 15:00:45 kloczek Exp $"
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include "chkname.h"
#include "commonio.h"
#include "defines.h"
#include "groupio.h"
#include "prototypes.h"
extern void __gr_del_entry (const struct commonio_entry *);
extern struct commonio_entry *__gr_get_head (void);
#ifdef SHADOWGRP
#include "sgroupio.h"
extern void __sgr_del_entry (const struct commonio_entry *);
extern struct commonio_entry *__sgr_get_head (void);
#endif
/*
* Exit codes
*/
#define E_OKAY 0
#define E_USAGE 1
#define E_BAD_ENTRY 2
#define E_CANT_OPEN 3
#define E_CANT_LOCK 4
#define E_CANT_UPDATE 5
/*
* Global variables
*/
static char *Prog;
static const char *grp_file = GROUP_FILE;
#ifdef SHADOWGRP
static const char *sgr_file = SGROUP_FILE;
#endif
static int read_only = 0;
/* local function prototypes */
static void usage (void);
static int yes_or_no (void);
static void delete_member (char **, const char *);
/*
* usage - print syntax message and exit
*/
static void usage (void)
{
#ifdef SHADOWGRP
fprintf (stderr, _("Usage: %s [-r] [-s] [group [gshadow]]\n"), Prog);
#else
fprintf (stderr, _("Usage: %s [-r] [-s] [group]\n"), Prog);
#endif
exit (E_USAGE);
}
/*
* yes_or_no - get answer to question from the user
*/
static int yes_or_no (void)
{
char buf[80];
/*
* In read-only mode all questions are answered "no".
*/
if (read_only) {
printf (_("No\n"));
return 0;
}
/*
* Get a line and see what the first character is.
*/
if (fgets (buf, sizeof buf, stdin))
return buf[0] == 'y' || buf[0] == 'Y';
return 0;
}
/*
* delete_member - delete an entry in a list of members
*/
static void delete_member (char **list, const char *member)
{
int i;
for (i = 0; list[i]; i++)
if (list[i] == member)
break;
if (list[i])
for (; list[i]; i++)
list[i] = list[i + 1];
}
/*
* grpck - verify group file integrity
*/
int main (int argc, char **argv)
{
int arg;
int errors = 0;
int deleted = 0;
int i;
struct commonio_entry *gre, *tgre;
struct group *grp;
int sort_mode = 0;
#ifdef SHADOWGRP
struct commonio_entry *sge, *tsge;
struct sgrp *sgr;
int is_shadow = 0;
#endif
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
OPENLOG ("grpck");
/*
* Parse the command line arguments
*/
while ((arg = getopt (argc, argv, "qrs")) != EOF) {
switch (arg) {
case 'q':
/* quiet - ignored for now */
break;
case 'r':
read_only = 1;
break;
case 's':
sort_mode = 1;
break;
default:
usage ();
}
}
if (sort_mode && read_only) {
fprintf (stderr, _("%s: -s and -r are incompatibile\n"), Prog);
exit (E_USAGE);
}
/*
* Make certain we have the right number of arguments
*/
#ifdef SHADOWGRP
if (optind != argc && optind + 1 != argc && optind + 2 != argc)
#else
if (optind != argc && optind + 1 != argc)
#endif
usage ();
/*
* If there are two left over filenames, use those as the group and
* group password filenames.
*/
if (optind != argc) {
grp_file = argv[optind];
gr_name (grp_file);
}
#ifdef SHADOWGRP
if (optind + 2 == argc) {
sgr_file = argv[optind + 1];
sgr_name (sgr_file);
is_shadow = 1;
} else if (optind == argc)
is_shadow = sgr_file_present ();
#endif
/*
* Lock the files if we aren't in "read-only" mode
*/
if (!read_only) {
if (!gr_lock ()) {
fprintf (stderr, _("%s: cannot lock file %s\n"),
Prog, grp_file);
if (optind == argc)
SYSLOG ((LOG_WARN, "cannot lock %s", grp_file));
closelog ();
exit (E_CANT_LOCK);
}
#ifdef SHADOWGRP
if (is_shadow && !sgr_lock ()) {
fprintf (stderr, _("%s: cannot lock file %s\n"),
Prog, sgr_file);
if (optind == argc)
SYSLOG ((LOG_WARN, "cannot lock %s", sgr_file));
closelog ();
exit (E_CANT_LOCK);
}
#endif
}
/*
* Open the files. Use O_RDONLY if we are in read_only mode,
* O_RDWR otherwise.
*/
if (!gr_open (read_only ? O_RDONLY : O_RDWR)) {
fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
grp_file);
if (optind == argc)
SYSLOG ((LOG_WARN, "cannot open %s", grp_file));
closelog ();
exit (E_CANT_OPEN);
}
#ifdef SHADOWGRP
if (is_shadow && !sgr_open (read_only ? O_RDONLY : O_RDWR)) {
fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
sgr_file);
if (optind == argc)
SYSLOG ((LOG_WARN, "cannot open %s", sgr_file));
closelog ();
exit (E_CANT_OPEN);
}
#endif
if (sort_mode) {
gr_sort ();
#ifdef SHADOWGRP
if (is_shadow)
sgr_sort ();
#endif
goto write_and_bye;
}
/*
* Loop through the entire group file.
*/
for (gre = __gr_get_head (); gre; gre = gre->next) {
/*
* Skip all NIS entries.
*/
if (gre->line[0] == '+' || gre->line[0] == '-')
continue;
/*
* Start with the entries that are completely corrupt. They
* have no (struct group) entry because they couldn't be
* parsed properly.
*/
if (!gre->eptr) {
/*
* Tell the user this entire line is bogus and ask
* them to delete it.
*/
printf (_("invalid group file entry\n"));
printf (_("delete line `%s'? "), gre->line);
errors++;
/*
* prompt the user to delete the entry or not
*/
if (!yes_or_no ())
continue;
/*
* All group file deletions wind up here. This code
* removes the current entry from the linked list.
* When done, it skips back to the top of the loop
* to try out the next list element.
*/
delete_gr:
SYSLOG ((LOG_INFO, "delete group line `%s'",
gre->line));
deleted++;
__gr_del_entry (gre);
continue;
}
/*
* Group structure is good, start using it.
*/
grp = gre->eptr;
/*
* Make sure this entry has a unique name.
*/
for (tgre = __gr_get_head (); tgre; tgre = tgre->next) {
const struct group *ent = tgre->eptr;
/*
* Don't check this entry
*/
if (tgre == gre)
continue;
/*
* Don't check invalid entries.
*/
if (!ent)
continue;
if (strcmp (grp->gr_name, ent->gr_name) != 0)
continue;
/*
* Tell the user this entry is a duplicate of
* another and ask them to delete it.
*/
printf (_("duplicate group entry\n"));
printf (_("delete line `%s'? "), gre->line);
errors++;
/*
* prompt the user to delete the entry or not
*/
if (yes_or_no ())
goto delete_gr;
}
/*
* Check for invalid group names. --marekm
*/
if (!check_group_name (grp->gr_name)) {
errors++;
printf (_("invalid group name `%s'\n"), grp->gr_name);
}
/*
* Workaround for a NYS libc 5.3.12 bug on RedHat 4.2 -
* groups with no members are returned as groups with one
* member "", causing grpck to fail. --marekm
*/
if (grp->gr_mem[0] && !grp->gr_mem[1]
&& *(grp->gr_mem[0]) == '\0')
grp->gr_mem[0] = (char *) 0;
/*
* Make sure each member exists
*/
for (i = 0; grp->gr_mem[i]; i++) {
if (getpwnam (grp->gr_mem[i]))
continue;
/*
* Can't find this user. Remove them
* from the list.
*/
errors++;
printf (_("group %s: no user %s\n"),
grp->gr_name, grp->gr_mem[i]);
printf (_("delete member `%s'? "), grp->gr_mem[i]);
if (!yes_or_no ())
continue;
SYSLOG ((LOG_INFO, "delete member `%s' group `%s'",
grp->gr_mem[i], grp->gr_name));
deleted++;
delete_member (grp->gr_mem, grp->gr_mem[i]);
gre->changed = 1;
__gr_set_changed ();
}
}
#ifdef SHADOWGRP
if (!is_shadow)
goto shadow_done;
/*
* Loop through the entire shadow group file.
*/
for (sge = __sgr_get_head (); sge; sge = sge->next) {
/*
* Start with the entries that are completely corrupt. They
* have no (struct sgrp) entry because they couldn't be
* parsed properly.
*/
if (!sge->eptr) {
/*
* Tell the user this entire line is bogus and ask
* them to delete it.
*/
printf (_("invalid shadow group file entry\n"));
printf (_("delete line `%s'? "), sge->line);
errors++;
/*
* prompt the user to delete the entry or not
*/
if (!yes_or_no ())
continue;
/*
* All shadow group file deletions wind up here.
* This code removes the current entry from the
* linked list. When done, it skips back to the top
* of the loop to try out the next list element.
*/
delete_sg:
SYSLOG ((LOG_INFO, "delete shadow line `%s'",
sge->line));
deleted++;
__sgr_del_entry (sge);
continue;
}
/*
* Shadow group structure is good, start using it.
*/
sgr = sge->eptr;
/*
* Make sure this entry has a unique name.
*/
for (tsge = __sgr_get_head (); tsge; tsge = tsge->next) {
const struct sgrp *ent = tsge->eptr;
/*
* Don't check this entry
*/
if (tsge == sge)
continue;
/*
* Don't check invalid entries.
*/
if (!ent)
continue;
if (strcmp (sgr->sg_name, ent->sg_name) != 0)
continue;
/*
* Tell the user this entry is a duplicate of
* another and ask them to delete it.
*/
printf (_("duplicate shadow group entry\n"));
printf (_("delete line `%s'? "), sge->line);
errors++;
/*
* prompt the user to delete the entry or not
*/
if (yes_or_no ())
goto delete_sg;
}
/*
* Make sure this entry exists in the /etc/group file.
*/
if (!gr_locate (sgr->sg_name)) {
printf (_("no matching group file entry\n"));
printf (_("delete line `%s'? "), sge->line);
errors++;
if (yes_or_no ())
goto delete_sg;
}
/*
* Make sure each administrator exists
*/
for (i = 0; sgr->sg_adm[i]; i++) {
if (getpwnam (sgr->sg_adm[i]))
continue;
/*
* Can't find this user. Remove them
* from the list.
*/
errors++;
printf (_
("shadow group %s: no administrative user %s\n"),
sgr->sg_name, sgr->sg_adm[i]);
printf (_("delete administrative member `%s'? "),
sgr->sg_adm[i]);
if (!yes_or_no ())
continue;
SYSLOG ((LOG_INFO,
"delete admin `%s' from shadow group `%s'",
sgr->sg_adm[i], sgr->sg_name));
deleted++;
delete_member (sgr->sg_adm, sgr->sg_adm[i]);
sge->changed = 1;
__sgr_set_changed ();
}
/*
* Make sure each member exists
*/
for (i = 0; sgr->sg_mem[i]; i++) {
if (getpwnam (sgr->sg_mem[i]))
continue;
/*
* Can't find this user. Remove them from the list.
*/
errors++;
printf (_("shadow group %s: no user %s\n"),
sgr->sg_name, sgr->sg_mem[i]);
printf (_("delete member `%s'? "), sgr->sg_mem[i]);
if (!yes_or_no ())
continue;
SYSLOG ((LOG_INFO,
"delete member `%s' from shadow group `%s'",
sgr->sg_mem[i], sgr->sg_name));
deleted++;
delete_member (sgr->sg_mem, sgr->sg_mem[i]);
sge->changed = 1;
__sgr_set_changed ();
}
}
shadow_done:
#endif /* SHADOWGRP */
/*
* All done. If there were no deletions we can just abandon any
* changes to the files.
*/
if (deleted) {
write_and_bye:
if (!gr_close ()) {
fprintf (stderr, _("%s: cannot update file %s\n"),
Prog, grp_file);
exit (E_CANT_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow && !sgr_close ()) {
fprintf (stderr, _("%s: cannot update file %s\n"),
Prog, sgr_file);
exit (E_CANT_UPDATE);
}
#endif
}
/*
* Don't be anti-social - unlock the files when you're done.
*/
#ifdef SHADOWGRP
if (is_shadow)
sgr_unlock ();
#endif
(void) gr_unlock ();
nscd_flush_cache ("group");
/*
* Tell the user what we did and exit.
*/
if (errors)
printf (deleted ?
_("%s: the files have been updated\n") :
_("%s: no changes\n"), Prog);
exit (errors ? E_BAD_ENTRY : E_OKAY);
}
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