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shadow/src/grpck.c
nekral-guest a9ae2a8710 Avoid implicit conversions to booleans.
2008-01-01 17:51:54 +00:00

792 lines
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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 "$Id$"
#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 "nscd.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;
static int use_system_grp_file = 1;
#ifdef SHADOWGRP
static const char *sgr_file = SGROUP_FILE;
static int use_system_sgr_file = 1;
static int is_shadow = 0;
#endif
/* Options */
static int read_only = 0;
static int sort_mode = 0;
/* local function prototypes */
static void usage (void);
static void delete_member (char **, const char *);
static void process_flags (int argc, char **argv);
static void open_files (void);
static void close_files (int changed);
static int check_members (const char *groupname,
char **members,
const char *fmt_info,
const char *fmt_prompt,
const char *fmt_syslog,
int *errors);
static void compare_members_lists (const char *groupname,
char **members,
char **other_members,
const char *file,
const char *other_file);
static void check_grp_file (int *errors, int *changed);
#ifdef SHADOWGRP
static void check_sgr_file (int *errors, int *changed);
#endif
/*
* 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);
}
/*
* 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];
}
}
}
/*
* process_flags - parse the command line options
*
* It will not return if an error is encountered.
*/
static void process_flags (int argc, char **argv)
{
int arg;
/*
* 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 ((argc < optind) || (argc > (optind + 2)))
#else
if ((argc < optind) || (argc > (optind + 1)))
#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);
use_system_grp_file = 0;
}
#ifdef SHADOWGRP
if ((optind + 2) == argc) {
sgr_file = argv[optind + 1];
sgr_name (sgr_file);
is_shadow = 1;
use_system_sgr_file = 0;
} else if (optind == argc) {
is_shadow = sgr_file_present ();
}
#endif
}
/*
* open_files - open the shadow database
*
* In read-only mode, the databases are not locked and are opened
* only for reading.
*/
static void open_files (void)
{
/*
* Lock the files if we aren't in "read-only" mode
*/
if (!read_only) {
if (gr_lock () == 0) {
fprintf (stderr, _("%s: cannot lock file %s\n"),
Prog, grp_file);
if (use_system_grp_file) {
SYSLOG ((LOG_WARN, "cannot lock %s", grp_file));
}
closelog ();
exit (E_CANT_LOCK);
}
#ifdef SHADOWGRP
if (is_shadow && (sgr_lock () == 0)) {
fprintf (stderr, _("%s: cannot lock file %s\n"),
Prog, sgr_file);
if (use_system_sgr_file) {
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) == 0) {
fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
grp_file);
if (use_system_grp_file) {
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) == 0)) {
fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
sgr_file);
if (use_system_sgr_file) {
SYSLOG ((LOG_WARN, "cannot open %s", sgr_file));
}
closelog ();
exit (E_CANT_OPEN);
}
#endif
}
/*
* close_files - close and unlock the group/gshadow databases
*
* If changed is not set, the databases are not closed, and no
* changes are committed in the databases. The databases are
* unlocked anyway.
*/
static void close_files (int changed)
{
/*
* All done. If there were no change we can just abandon any
* changes to the files.
*/
if (changed) {
if (gr_close () == 0) {
fprintf (stderr, _("%s: cannot update file %s\n"),
Prog, grp_file);
exit (E_CANT_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow && (sgr_close () == 0)) {
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 ();
}
/*
* check_members - check that every members of a group exist
*
* If an error is detected, *errors is incremented.
*
* The user will be prompted for the removal of the non-existent
* user.
*
* If any changes are performed, the return value will be 1,
* otherwise check_members() returns 0.
*
* fmt_info, fmt_prompt, and fmt_syslog are used for logging.
* * fmt_info must contain two string flags (%s): for the group's
* name and the missing member.
* * fmt_prompt must contain one string flags (%s): the missing
* member.
* * fmt_syslog must contain two string flags (%s): for the
* group's name and the missing member.
*/
static int check_members (const char *groupname,
char **members,
const char *fmt_info,
const char *fmt_prompt,
const char *fmt_syslog,
int *errors)
{
int i;
int members_changed = 0;
/*
* Make sure each member exists
*/
for (i = 0; NULL != members[i]; i++) {
/* local, no need for xgetpwnam */
if (getpwnam (members[i]) != NULL) {
continue;
}
/*
* Can't find this user. Remove them
* from the list.
*/
*errors += 1;
printf (fmt_info, groupname, members[i]);
printf (fmt_prompt, members[i]);
if (!yes_or_no (read_only)) {
continue;
}
SYSLOG ((LOG_INFO, fmt_syslog, members[i], groupname));
members_changed = 1;
delete_member (members, members[i]);
}
return members_changed;
}
/*
* compare_members_lists - make sure the list of members is contained in
* another list.
*
* compare_members_lists() checks that all the members of members are
* also in other_members.
* file and other_file are used for logging.
*
* TODO: No changes are performed on the lists.
*/
static void compare_members_lists (const char *groupname,
char **members,
char **other_members,
const char *file,
const char *other_file)
{
char **pmem, **other_pmem;
for (pmem = members; NULL != *pmem; pmem++) {
for (other_pmem = other_members; NULL != *other_pmem; other_pmem++) {
if (strcmp (*pmem, *other_pmem) == 0) {
break;
}
}
if (*other_pmem == NULL) {
printf
("'%s' is a member of the '%s' group in %s but not in %s\n",
*pmem, groupname, file, other_file);
}
}
}
/*
* check_grp_file - check the content of the group file
*/
static void check_grp_file (int *errors, int *changed)
{
struct commonio_entry *gre, *tgre;
struct group *grp;
#ifdef SHADOWGRP
struct sgrp *sgr;
#endif
/*
* Loop through the entire group file.
*/
for (gre = __gr_get_head (); NULL != 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 (NULL == 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 += 1;
/*
* prompt the user to delete the entry or not
*/
if (!yes_or_no (read_only)) {
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));
*changed = 1;
__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 (); NULL != 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 (NULL == 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 += 1;
/*
* prompt the user to delete the entry or not
*/
if (yes_or_no (read_only)) {
goto delete_gr;
}
}
/*
* Check for invalid group names. --marekm
*/
if (!check_group_name (grp->gr_name)) {
*errors += 1;
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 ( (NULL != grp->gr_mem[0])
&& (NULL == grp->gr_mem[1])
&& ('\0' == grp->gr_mem[0][0])) {
grp->gr_mem[0] = NULL;
}
if (check_members (grp->gr_name, grp->gr_mem,
_("group %s: no user %s\n"),
_("delete member '%s'? "),
"delete member `%s' from group `%s'",
errors) == 1) {
*changed = 1;
gre->changed = 1;
__gr_set_changed ();
}
#ifdef SHADOWGRP
/*
* Make sure this entry exists in the /etc/gshadow file.
*/
if (is_shadow) {
sgr = (struct sgrp *) sgr_locate (grp->gr_name);
if (sgr == NULL) {
printf (_
("no matching group file entry in %s\n"),
sgr_file);
printf (_("add group '%s' in %s ?"),
grp->gr_name, sgr_file);
*errors += 1;
if (yes_or_no (read_only)) {
struct sgrp sg;
struct group gr;
static char *empty = NULL;
sg.sg_name = grp->gr_name;
sg.sg_passwd = grp->gr_passwd;
sg.sg_adm = &empty;
sg.sg_mem = grp->gr_mem;
SYSLOG ((LOG_INFO,
"add group `%s' to `%s'",
grp->gr_name, sgr_file));
*changed = 1;
if (sgr_update (&sg) == 0) {
fprintf (stderr,
_
("%s: can't update shadow entry for %s\n"),
Prog, sg.sg_name);
exit (E_CANT_UPDATE);
}
/* remove password from /etc/group */
gr = *grp;
gr.gr_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
if (gr_update (&gr) == 0) {
fprintf (stderr,
_
("%s: can't update entry for group %s\n"),
Prog, gr.gr_name);
exit (E_CANT_UPDATE);
}
}
} else {
/**
* Verify that all the members defined in /etc/group are also
* present in /etc/gshadow.
*/
compare_members_lists (grp->gr_name,
grp->gr_mem, sgr->sg_mem,
grp_file, sgr_file);
}
}
#endif
}
}
#ifdef SHADOWGRP
/*
* check_sgr_file - check the content of the shadowed group file (gshadow)
*/
static void check_sgr_file (int *errors, int *changed)
{
struct group *grp;
struct commonio_entry *sge, *tsge;
struct sgrp *sgr;
/*
* Loop through the entire shadow group file.
*/
for (sge = __sgr_get_head (); NULL != 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 (NULL == 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 += 1;
/*
* prompt the user to delete the entry or not
*/
if (!yes_or_no (read_only)) {
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));
*changed = 1;
__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 (); NULL != 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 (NULL == 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 += 1;
/*
* prompt the user to delete the entry or not
*/
if (yes_or_no (read_only)) {
goto delete_sg;
}
}
/*
* Make sure this entry exists in the /etc/group file.
*/
grp = (struct group *) gr_locate (sgr->sg_name);
if (grp == NULL) {
printf (_("no matching group file entry in %s\n"),
grp_file);
printf (_("delete line '%s'? "), sge->line);
*errors += 1;
if (yes_or_no (read_only)) {
goto delete_sg;
}
} else {
/**
* Verify that the all members defined in /etc/gshadow are also
* present in /etc/group.
*/
compare_members_lists (sgr->sg_name,
sgr->sg_mem, grp->gr_mem,
sgr_file, grp_file);
}
/*
* Make sure each administrator exists
*/
if (check_members (sgr->sg_name, sgr->sg_adm,
_("shadow group %s: no administrative user %s\n"),
_("delete administrative member '%s'? "),
"delete admin `%s' from shadow group `%s'",
errors) == 1) {
*changed = 1;
sge->changed = 1;
__sgr_set_changed ();
}
/*
* Make sure each member exists
*/
if (check_members (sgr->sg_name, sgr->sg_mem,
_("shadow group %s: no user %s\n"),
_("delete member '%s'? "),
"delete member `%s' from shadow group `%s'",
errors) == 1) {
*changed = 1;
sge->changed = 1;
__sgr_set_changed ();
}
}
}
#endif /* SHADOWGRP */
/*
* grpck - verify group file integrity
*/
int main (int argc, char **argv)
{
int errors = 0;
int changed = 0;
/*
* 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 */
process_flags (argc, argv);
open_files ();
if (sort_mode) {
gr_sort ();
#ifdef SHADOWGRP
if (is_shadow) {
sgr_sort ();
}
changed = 1;
#endif
} else {
check_grp_file (&errors, &changed);
#ifdef SHADOWGRP
if (is_shadow) {
check_sgr_file (&errors, &changed);
}
#endif
}
/* Commit the change in the database if needed */
close_files (changed);
nscd_flush_cache ("group");
/*
* Tell the user what we did and exit.
*/
if (errors != 0) {
printf (changed ?
_("%s: the files have been updated\n") :
_("%s: no changes\n"), Prog);
}
exit (errors ? E_BAD_ENTRY : E_OKAY);
}
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