/*
* 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
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 = (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 = ∅
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
}
}
/*
* 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);
}
