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shadow/src/grpck.c

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/*
* SPDX-FileCopyrightText: 1992 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2001 , Michał Moskal
* SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2011, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <getopt.h>
#include "chkname.h"
#include "commonio.h"
#include "defines.h"
#include "groupio.h"
#include "nscd.h"
#include "sssd.h"
#include "prototypes.h"
#include "shadowlog.h"
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif
/*
* Exit codes
*/
/*@-exitarg@*/
#define E_OKAY 0
#define E_SUCCESS 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
*/
const char *Prog;
static const char *grp_file = GROUP_FILE;
static bool use_system_grp_file = true;
#ifdef SHADOWGRP
static const char *sgr_file = SGROUP_FILE;
static bool use_system_sgr_file = true;
static bool is_shadow = false;
static bool sgr_locked = false;
#endif
static bool gr_locked = false;
/* Options */
static bool read_only = false;
static bool sort_mode = false;
static bool silence_warnings = false;
/* local function prototypes */
static void fail_exit (int status);
NORETURN static void usage (int status);
static void delete_member (char **, const char *);
static void process_flags (int argc, char **argv);
static void open_files (void);
static void close_files (bool 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 check_grp_file (int *errors, bool *changed);
#ifdef SHADOWGRP
static void compare_members_lists (const char *groupname,
char **members,
char **other_members,
const char *file,
const char *other_file);
static void check_sgr_file (int *errors, bool *changed);
#endif
/*
* fail_exit - exit with an error code after unlocking files
*/
static void fail_exit (int status)
{
if (gr_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
}
#ifdef SHADOWGRP
if (sgr_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
}
#endif
closelog ();
exit (status);
}
/*
* usage - print syntax message and exit
*/
NORETURN
static void
usage (int status)
{
FILE *usageout = (E_SUCCESS != status) ? stderr : stdout;
#ifdef SHADOWGRP
(void) fprintf (usageout,
_("Usage: %s [options] [group [gshadow]]\n"
"\n"
"Options:\n"),
Prog);
#else /* !SHADOWGRP */
(void) fprintf (usageout,
_("Usage: %s [options] [group]\n"
"\n"
"Options:\n"),
Prog);
#endif /* !SHADOWGRP */
(void) fputs (_(" -h, --help display this help message and exit\n"), usageout);
(void) fputs (_(" -r, --read-only display errors and warnings\n"
" but do not change files\n"), usageout);
(void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout);
(void) fputs (_(" -s, --sort sort entries by UID\n"), usageout);
(void) fputs (_(" -S, --silence-warnings silence controversial/paranoid warnings\n"), usageout);
(void) fputs ("\n", usageout);
exit (status);
}
/*
* delete_member - delete an entry in a list of members
*
* It only deletes the first entry with the given name.
* The member is defined by its address, no string comparison are
* performed.
*/
static void delete_member (char **list, const char *member)
{
int i;
for (i = 0; NULL != list[i]; i++) {
if (list[i] == member) {
break;
}
}
for (; NULL != 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 c;
static struct option long_options[] = {
{"help", no_argument, NULL, 'h'},
{"quiet", no_argument, NULL, 'q'},
{"read-only", no_argument, NULL, 'r'},
{"root", required_argument, NULL, 'R'},
{"silence-warnings", no_argument, NULL, 'S'},
{"sort", no_argument, NULL, 's'},
{NULL, 0, NULL, '\0'}
};
/*
* Parse the command line arguments
*/
while ((c = getopt_long (argc, argv, "hqrR:sS",
long_options, NULL)) != -1) {
switch (c) {
case 'h':
usage (E_SUCCESS);
/*@notreached@*/break;
case 'q':
/* quiet - ignored for now */
break;
case 'r':
read_only = true;
break;
case 'R': /* no-op, handled in process_root_flag () */
break;
case 's':
sort_mode = true;
break;
case 'S':
silence_warnings = true;
break;
default:
usage (E_USAGE);
}
}
if (sort_mode && read_only) {
fprintf (stderr, _("%s: -s and -r are incompatible\n"), Prog);
exit (E_USAGE);
}
/*
* Make certain we have the right number of arguments
*/
#ifdef SHADOWGRP
if (argc > (optind + 2))
#else
if (argc > (optind + 1))
#endif
{
usage (E_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_setdbname (grp_file);
use_system_grp_file = false;
}
#ifdef SHADOWGRP
if ((optind + 2) == argc) {
sgr_file = argv[optind + 1];
sgr_setdbname (sgr_file);
is_shadow = true;
use_system_sgr_file = false;
} 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 %s; try again later.\n"),
Prog, grp_file);
fail_exit (E_CANT_LOCK);
}
gr_locked = true;
#ifdef SHADOWGRP
if (is_shadow) {
if (sgr_lock () == 0) {
fprintf (stderr,
_("%s: cannot lock %s; try again later.\n"),
Prog, sgr_file);
fail_exit (E_CANT_LOCK);
}
sgr_locked = true;
}
#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_CREAT | O_RDWR) == 0) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog,
grp_file);
if (use_system_grp_file) {
SYSLOG ((LOG_WARN, "cannot open %s", grp_file));
}
fail_exit (E_CANT_OPEN);
}
#ifdef SHADOWGRP
if (is_shadow && (sgr_open (read_only ? O_RDONLY : O_CREAT | O_RDWR) == 0)) {
fprintf (stderr, _("%s: cannot open %s\n"), Prog,
sgr_file);
if (use_system_sgr_file) {
SYSLOG ((LOG_WARN, "cannot open %s", sgr_file));
}
fail_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 (bool 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: failure while writing changes to %s\n"),
Prog, grp_file);
fail_exit (E_CANT_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow && (sgr_close () == 0)) {
fprintf (stderr, _("%s: failure while writing changes to %s\n"),
Prog, sgr_file);
fail_exit (E_CANT_UPDATE);
}
#endif
}
/*
* Don't be anti-social - unlock the files when you're done.
*/
#ifdef SHADOWGRP
if (sgr_locked) {
if (sgr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, sgr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", sgr_dbname ()));
/* continue */
}
sgr_locked = false;
}
#endif
if (gr_locked) {
if (gr_unlock () == 0) {
fprintf (stderr, _("%s: failed to unlock %s\n"), Prog, gr_dbname ());
SYSLOG ((LOG_ERR, "failed to unlock %s", gr_dbname ()));
/* continue */
}
gr_locked = false;
}
}
/*
* 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]);
/* Rewind in case of removal */
i--;
}
return members_changed;
}
#ifdef SHADOWGRP
/*
* 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 (!silence_warnings && *other_pmem == NULL) {
printf
("'%s' is a member of the '%s' group in %s but not in %s\n",
*pmem, groupname, file, other_file);
}
}
}
#endif /* SHADOWGRP */
/*
* check_grp_file - check the content of the group file
*/
static void check_grp_file (int *errors, bool *changed)
{
struct commonio_entry *gre, *tgre;
struct group *grp;
#ifdef SHADOWGRP
const 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.
*/
(void) puts (_("invalid group file entry"));
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 = true;
__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.
*/
(void) puts (_("duplicate group entry"));
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 (!is_valid_group_name (grp->gr_name)) {
*errors += 1;
printf (_("invalid group name '%s'\n"), grp->gr_name);
}
/*
* Check for invalid group ID.
*/
if (grp->gr_gid == (gid_t)-1) {
printf (_("invalid group ID '%lu'\n"), (long unsigned int)grp->gr_gid);
*errors += 1;
}
/*
* 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 = true;
gre->changed = true;
__gr_set_changed ();
}
#ifdef SHADOWGRP
/*
* Make sure this entry exists in the /etc/gshadow file.
*/
if (is_shadow) {
sgr = 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 = true;
if (sgr_update (&sg) == 0) {
fprintf (stderr,
_("%s: failed to prepare the new %s entry '%s'\n"),
Prog, sgr_dbname (), sg.sg_name);
fail_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: failed to prepare the new %s entry '%s'\n"),
Prog, gr_dbname (), gr.gr_name);
fail_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);
/* The group entry has a gshadow counterpart.
* Make sure no passwords are in group.
*/
if (strcmp (grp->gr_passwd, SHADOW_PASSWD_STRING) != 0) {
printf (_("group %s has an entry in %s, but its password field in %s is not set to 'x'\n"),
grp->gr_name, sgr_file, grp_file);
*errors += 1;
}
}
}
#endif
}
}
#ifdef SHADOWGRP
/*
* check_sgr_file - check the content of the shadowed group file (gshadow)
*/
static void check_sgr_file (int *errors, bool *changed)
{
const 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.
*/
(void) puts (_("invalid shadow group file entry"));
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 = true;
__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.
*/
(void) puts (_("duplicate shadow group entry"));
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 = 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 = true;
sge->changed = true;
__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 = true;
sge->changed = true;
__sgr_set_changed ();
}
}
}
#endif /* SHADOWGRP */
/*
* grpck - verify group file integrity
*/
int main (int argc, char **argv)
{
int errors = 0;
bool changed = false;
/*
* Get my name so that I can use it to report errors.
*/
Prog = Basename (argv[0]);
log_set_progname(Prog);
log_set_logfd(stderr);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
process_root_flag ("-R", argc, argv);
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 = true;
#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);
if (!read_only) {
nscd_flush_cache ("group");
sssd_flush_cache (SSSD_DB_GROUP);
}
/*
* Tell the user what we did and exit.
*/
if (0 != errors) {
if (changed) {
printf (_("%s: the files have been updated\n"), Prog);
} else {
printf (_("%s: no changes\n"), Prog);
}
}
return ((0 != errors) ? E_BAD_ENTRY : E_OKAY);
}
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