shadow/src/pwconv.c

189 lines
4.8 KiB
C

/*
* pwconv - create or update /etc/shadow with information from
* /etc/passwd.
*
* It is more like SysV pwconv, slightly different from the original Shadow
* pwconv. Depends on "x" as password in /etc/passwd which means that the
* password has already been moved to /etc/shadow. There is no need to move
* /etc/npasswd to /etc/passwd, password files are updated using library
* routines with proper locking.
*
* Can be used to update /etc/shadow after adding/deleting users by editing
* /etc/passwd. There is no man page yet, but this program should be close
* to pwconv(1M) on Solaris 2.x.
*
* Warning: make sure that all users have "x" as the password in /etc/passwd
* before running this program for the first time on a system which already
* has shadow passwords. Anything else (like "*" from old versions of the
* shadow suite) will replace the user's encrypted password in /etc/shadow.
*
* Doesn't currently support pw_age information in /etc/passwd, and doesn't
* support DBM files. Add it if you need it...
*
* Copyright (C) 1996-1997, Marek Michalkiewicz
* <marekm@i17linuxb.ists.pwr.wroc.pl>
* This program may be freely used and distributed for any purposes. If you
* improve it, please send me your changes. Thanks!
*/
#include <config.h>
#ident "$Id$"
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "defines.h"
#include "getdef.h"
#include "prototypes.h"
#include "pwio.h"
#include "shadowio.h"
#include "nscd.h"
/*
* exit status values
*/
#define E_SUCCESS 0 /* success */
#define E_NOPERM 1 /* permission denied */
#define E_USAGE 2 /* invalid command syntax */
#define E_FAILURE 3 /* unexpected failure, nothing done */
#define E_MISSING 4 /* unexpected failure, passwd file missing */
#define E_PWDBUSY 5 /* passwd file(s) busy */
#define E_BADENTRY 6 /* bad shadow entry */
/*
* Global variables
*/
static int
shadow_locked = 0, passwd_locked = 0;
/* local function prototypes */
static void fail_exit (int);
static void fail_exit (int status)
{
if (shadow_locked)
spw_unlock ();
if (passwd_locked)
pw_unlock ();
exit (status);
}
int main (int argc, char **argv)
{
const struct passwd *pw;
struct passwd pwent;
const struct spwd *sp;
struct spwd spent;
char *Prog = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
if (!pw_lock ()) {
fprintf (stderr, _("%s: can't lock passwd file\n"), Prog);
fail_exit (E_PWDBUSY);
}
passwd_locked++;
if (!pw_open (O_RDWR)) {
fprintf (stderr, _("%s: can't open passwd file\n"), Prog);
fail_exit (E_MISSING);
}
if (!spw_lock ()) {
fprintf (stderr, _("%s: can't lock shadow file\n"), Prog);
fail_exit (E_PWDBUSY);
}
shadow_locked++;
if (!spw_open (O_CREAT | O_RDWR)) {
fprintf (stderr, _("%s: can't open shadow file\n"), Prog);
fail_exit (E_FAILURE);
}
/*
* Remove /etc/shadow entries for users not in /etc/passwd.
*/
spw_rewind ();
while ((sp = spw_next ())) {
if (pw_locate (sp->sp_namp))
continue;
if (!spw_remove (sp->sp_namp)) {
/*
* This shouldn't happen (the entry exists) but...
*/
fprintf (stderr,
_
("%s: can't remove shadow entry for %s\n"),
Prog, sp->sp_namp);
fail_exit (E_FAILURE);
}
}
/*
* Update shadow entries which don't have "x" as pw_passwd. Add any
* missing shadow entries.
*/
pw_rewind ();
while ((pw = pw_next ())) {
sp = spw_locate (pw->pw_name);
if (sp) {
/* do we need to update this entry? */
if (strcmp (pw->pw_passwd, SHADOW_PASSWD_STRING) == 0)
continue;
/* update existing shadow entry */
spent = *sp;
} else {
/* add new shadow entry */
memset (&spent, 0, sizeof spent);
spent.sp_namp = pw->pw_name;
spent.sp_min = getdef_num ("PASS_MIN_DAYS", -1);
spent.sp_max = getdef_num ("PASS_MAX_DAYS", -1);
spent.sp_warn = getdef_num ("PASS_WARN_AGE", -1);
spent.sp_inact = -1;
spent.sp_expire = -1;
spent.sp_flag = -1;
}
spent.sp_pwdp = pw->pw_passwd;
spent.sp_lstchg = time ((time_t *) 0) / (24L * 3600L);
if (!spw_update (&spent)) {
fprintf (stderr,
_
("%s: can't update shadow entry for %s\n"),
Prog, spent.sp_namp);
fail_exit (E_FAILURE);
}
/* remove password from /etc/passwd */
pwent = *pw;
pwent.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
if (!pw_update (&pwent)) {
fprintf (stderr,
_
("%s: can't update passwd entry for %s\n"),
Prog, pwent.pw_name);
fail_exit (E_FAILURE);
}
}
if (!spw_close ()) {
fprintf (stderr, _("%s: can't update shadow file\n"), Prog);
fail_exit (E_FAILURE);
}
if (!pw_close ()) {
fprintf (stderr, _("%s: can't update passwd file\n"), Prog);
fail_exit (E_FAILURE);
}
chmod (PASSWD_FILE "-", 0600); /* /etc/passwd- (backup file) */
spw_unlock ();
pw_unlock ();
nscd_flush_cache ("passwd");
exit (E_SUCCESS);
}