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* NEWS, src/groupmod.c: Make sure the passwd, group, and gshadow

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files are unlocked on exit. Unlock locked files in fail_exit().
  Prefer fail_exit() over exit().
* NEWS, src/groupmod.c: When the GID of a group is changed, update
  also the GID of the passwd entries of the users whose primary
  group is the group being modified.
This commit is contained in:
nekral-guest 2008-03-08 23:01:49 +00:00
parent b1a0769d3d
commit a8a614c515
3 changed files with 128 additions and 27 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2008-03-08 Nicolas François <nicolas.francois@centraliens.net>
* NEWS, src/groupmod.c: Make sure the passwd, group, and gshadow
files are unlocked on exit. Unlock locked files in fail_exit().
Prefer fail_exit() over exit().
* NEWS, src/groupmod.c: When the GID of a group is changed, update
also the GID of the passwd entries of the users whose primary
group is the group being modified.
2008-03-08 Nicolas François <nicolas.francois@centraliens.net>
* lib/commonio.c (commonio_remove): Fail when the name to be

3
NEWS
View File

@ -42,6 +42,9 @@ shadow-4.1.0 -> shadow-4.1.1 UNRELEASED
* Fix buffer overflow when adding an user to a group. Thanks to Peter Vrabec.
- groupmod
* New option -p/--password to specify an encrypted password.
* Make sure the group and gshadow files are unlocked on exit.
* When the GID of a group is changed, update also the GID of the passwd
entries of the users whose primary group is the group being modified.
- grpck
* Fix logging of changes to syslog when a group file is provided,
without a gshadow file.

143
src/groupmod.c
View File

@ -44,6 +44,7 @@
#include "chkname.h"
#include "defines.h"
#include "groupio.h"
#include "pwio.h"
#include "nscd.h"
#include "prototypes.h"
#ifdef SHADOWGRP
@ -64,7 +65,10 @@
*/
#ifdef SHADOWGRP
static int is_shadow_grp;
static int gshadow_locked = 0;
#endif
static int group_locked = 0;
static int passwd_locked = 0;
static char *group_name;
static char *group_newname;
static char *group_passwd;
@ -81,6 +85,7 @@ static int
/* local function prototypes */
static void usage (void);
static void fail_exit (int);
static void new_grent (struct group *);
#ifdef SHADOWGRP
@ -93,6 +98,7 @@ static void process_flags (int, char **);
static void close_files (void);
static void open_files (void);
static gid_t get_gid (const char *gidstr);
static void update_primary_groups (gid_t ogid, gid_t ngid);
/*
* usage - display usage message and exit
@ -112,6 +118,20 @@ static void usage (void)
exit (E_USAGE);
}
static void fail_exit (int status)
{
if (group_locked) {
gr_unlock ();
}
if (gshadow_locked) {
sgr_unlock ();
}
if (passwd_locked) {
pw_unlock();
}
exit (status);
}
/*
* new_grent - updates the values in a group file entry
*
@ -174,7 +194,7 @@ static void grp_update (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifying group",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
grp = *ogrp;
new_grent (&grp);
@ -187,6 +207,10 @@ static void grp_update (void)
}
#endif /* SHADOWGRP */
if (gflg) {
update_primary_groups (ogrp->gr_gid, group_newid);
}
/*
* Write out the new group file entry.
*/
@ -196,7 +220,7 @@ static void grp_update (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
if (nflg && !gr_remove (group_name)) {
fprintf (stderr, _("%s: error removing group entry\n"), Prog);
@ -204,7 +228,7 @@ static void grp_update (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "deleting group",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
@ -225,7 +249,7 @@ static void grp_update (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "adding group",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp && nflg && !sgr_remove (group_name)) {
fprintf (stderr, _("%s: error removing group entry\n"), Prog);
@ -233,7 +257,7 @@ static void grp_update (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "deleting group",
group_name, -1, 0);
#endif
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
out:
#endif /* SHADOWGRP */
@ -246,9 +270,10 @@ static void grp_update (void)
SYSLOG ((LOG_INFO, "change group `%s' to `%s'",
group_name, group_newname));
if (gflg)
if (gflg) {
SYSLOG ((LOG_INFO, "change GID for `%s' to %u",
nflg ? group_newname : group_name, group_newid));
}
}
/*
@ -279,7 +304,7 @@ static void check_new_gid (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modify gid", NULL,
group_newid, 0);
#endif
exit (E_GID_IN_USE);
fail_exit (E_GID_IN_USE);
}
/*
@ -312,7 +337,7 @@ static void check_new_name (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying group", group_name, -1, 0);
#endif
exit (E_NAME_IN_USE);
fail_exit (E_NAME_IN_USE);
}
return;
}
@ -327,7 +352,7 @@ static void check_new_name (void)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog, "modifying group", group_name,
-1, 0);
#endif
exit (E_BAD_ARG);
fail_exit (E_BAD_ARG);
}
/*
@ -342,7 +367,7 @@ static gid_t get_gid (const char *gidstr)
if (*errptr || errno == ERANGE || val < 0) {
fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog,
gidstr);
exit (E_BAD_ARG);
fail_exit (E_BAD_ARG);
}
return val;
}
@ -417,18 +442,30 @@ static void close_files (void)
{
if (!gr_close ()) {
fprintf (stderr, _("%s: cannot rewrite group file\n"), Prog);
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
gr_unlock ();
group_locked--;
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_close ()) {
fprintf (stderr,
_("%s: cannot rewrite shadow group file\n"), Prog);
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
if (is_shadow_grp)
if (is_shadow_grp) {
sgr_unlock ();
gshadow_locked--;
}
#endif /* SHADOWGRP */
if (gflg) {
if (!pw_close ()) {
fprintf (stderr,
_("%s: cannot rewrite passwd file\n"), Prog);
fail_exit (E_GRP_UPDATE);
}
pw_unlock();
passwd_locked--;
}
}
/*
@ -440,24 +477,74 @@ static void open_files (void)
{
if (!gr_lock ()) {
fprintf (stderr, _("%s: unable to lock group file\n"), Prog);
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
group_locked++;
if (!gr_open (O_RDWR)) {
fprintf (stderr, _("%s: unable to open group file\n"), Prog);
exit (E_GRP_UPDATE);
fail_exit (E_GRP_UPDATE);
}
#ifdef SHADOWGRP
if (is_shadow_grp && !sgr_lock ()) {
fprintf (stderr,
_("%s: unable to lock shadow group file\n"), Prog);
exit (E_GRP_UPDATE);
}
if (is_shadow_grp && !sgr_open (O_RDWR)) {
fprintf (stderr,
_("%s: unable to open shadow group file\n"), Prog);
exit (E_GRP_UPDATE);
if (is_shadow_grp) {
if (!sgr_lock ()) {
fprintf (stderr,
_("%s: unable to lock shadow group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
gshadow_locked++;
if (!sgr_open (O_RDWR)) {
fprintf (stderr,
_("%s: unable to open shadow group file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
}
#endif /* SHADOWGRP */
if (gflg) {
if (!pw_lock ()) {
fprintf (stderr,
_("%s: unable to lock password file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
passwd_locked++;
if (!pw_open (O_RDWR)) {
fprintf (stderr,
_("%s: unable to open password file\n"),
Prog);
fail_exit (E_GRP_UPDATE);
}
}
}
void update_primary_groups (gid_t ogid, gid_t ngid)
{
struct passwd *pwd;
setpwent ();
while ((pwd = getpwent ()) != NULL) {
if (pwd->pw_gid == ogid) {
const struct passwd *lpwd;
struct passwd npwd;
lpwd = pw_locate (pwd->pw_name);
if (NULL == lpwd) {
fprintf (stderr,
_("%s: cannot change the primary group of user '%s' from %u to %u, since it is not in the passwd file.\n"),
Prog, pwd->pw_name, ogid, ngid);
fail_exit (E_GRP_UPDATE);
} else {
npwd = *lpwd;
npwd.pw_gid = ngid;
if (!pw_update (&npwd)) {
fprintf (stderr,
_("%s: cannot change the primary group of user '%s' from %u to %u.\n"),
Prog, pwd->pw_name, ogid, ngid);
fail_exit (E_GRP_UPDATE);
}
}
}
}
}
/*
@ -528,7 +615,7 @@ int main (int argc, char **argv)
if (retval != PAM_SUCCESS) {
fprintf (stderr, _("%s: PAM authentication failed\n"), Prog);
exit (1);
fail_exit (1);
}
#endif /* USE_PAM */
@ -548,7 +635,7 @@ int main (int argc, char **argv)
audit_logger (AUDIT_USER_CHAUTHTOK, Prog,
"modifying group", group_name, -1, 0);
#endif
exit (E_NOTFOUND);
fail_exit (E_NOTFOUND);
} else
group_id = grp->gr_gid;
}
@ -581,7 +668,7 @@ int main (int argc, char **argv)
fprintf (stderr, _("%s: %s is the NIS master\n"),
Prog, nis_master);
}
exit (E_NOTFOUND);
fail_exit (E_NOTFOUND);
}
#endif
@ -598,6 +685,7 @@ int main (int argc, char **argv)
open_files ();
grp_update ();
close_files ();
nscd_flush_cache ("group");
@ -609,3 +697,4 @@ int main (int argc, char **argv)
exit (E_SUCCESS);
/* NOT REACHED */
}