2007-10-07 17:14:02 +05:30
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/*
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* pwconv - create or update /etc/shadow with information from
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* /etc/passwd.
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*
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* It is more like SysV pwconv, slightly different from the
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* original Shadow pwconv. Depends on "x" as password in
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* /etc/passwd which means that the password has already been
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* moved to /etc/shadow. There is no need to move /etc/npasswd
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* to /etc/passwd, password files are updated using library
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* routines with proper locking.
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*
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* Can be used to update /etc/shadow after adding/deleting users
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* by editing /etc/passwd. There is no man page yet, but this
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* program should be close to pwconv(1M) on Solaris 2.x.
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*
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* Warning: make sure that all users have "x" as the password in
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* /etc/passwd before running this program for the first time on
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* a system which already has shadow passwords. Anything else
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* (like "*" from old versions of the shadow suite) will replace
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* the user's encrypted password in /etc/shadow.
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*
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* Doesn't currently support pw_age information in /etc/passwd,
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* and doesn't support DBM files. Add it if you need it...
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*
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* Copyright (C) 1996-1997, Marek Michalkiewicz
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* <marekm@i17linuxb.ists.pwr.wroc.pl>
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* This program may be freely used and distributed for any purposes.
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* If you improve it, please send me your changes. Thanks!
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*/
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#include <config.h>
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#include "rcsid.h"
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2007-10-07 17:14:14 +05:30
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RCSID(PKG_VER "$Id: pwconv.c,v 1.11 2000/08/26 18:27:18 marekm Exp $")
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2007-10-07 17:14:02 +05:30
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <pwd.h>
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#include "prototypes.h"
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#include "defines.h"
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#include "pwio.h"
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#include "shadowio.h"
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#include "getdef.h"
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/*
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* exit status values
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*/
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#define E_SUCCESS 0 /* success */
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#define E_NOPERM 1 /* permission denied */
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#define E_USAGE 2 /* bad command syntax */
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#define E_FAILURE 3 /* unexpected failure, nothing done */
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#define E_MISSING 4 /* unexpected failure, passwd file missing */
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#define E_PWDBUSY 5 /* passwd file(s) busy */
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#define E_BADENTRY 6 /* bad shadow entry */
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static int
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shadow_locked = 0,
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passwd_locked = 0;
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/* local function prototypes */
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2007-10-07 17:14:14 +05:30
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static void fail_exit(int);
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2007-10-07 17:14:02 +05:30
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static void
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fail_exit(int status)
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{
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if (shadow_locked)
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spw_unlock();
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if (passwd_locked)
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pw_unlock();
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exit(status);
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}
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int
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main(int argc, char **argv)
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{
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const struct passwd *pw;
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struct passwd pwent;
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const struct spwd *sp;
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struct spwd spent;
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char *Prog = argv[0];
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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if (!pw_lock()) {
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fprintf(stderr, _("%s: can't lock passwd file\n"), Prog);
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fail_exit(E_PWDBUSY);
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}
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passwd_locked++;
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if (!pw_open(O_RDWR)) {
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fprintf(stderr, _("%s: can't open passwd file\n"), Prog);
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fail_exit(E_MISSING);
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}
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if (!spw_lock()) {
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fprintf(stderr, _("%s: can't lock shadow file\n"), Prog);
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fail_exit(E_PWDBUSY);
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}
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shadow_locked++;
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if (!spw_open(O_CREAT | O_RDWR)) {
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fprintf(stderr, _("%s: can't open shadow file\n"), Prog);
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fail_exit(E_FAILURE);
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}
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/*
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* Remove /etc/shadow entries for users not in /etc/passwd.
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*/
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spw_rewind();
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while ((sp = spw_next())) {
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if (pw_locate(sp->sp_namp))
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continue;
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if (!spw_remove(sp->sp_namp)) {
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/*
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* This shouldn't happen (the entry exists) but...
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*/
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fprintf(stderr,
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_("%s: can't remove shadow entry for %s\n"),
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Prog, sp->sp_namp);
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fail_exit(E_FAILURE);
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}
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}
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/*
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* Update shadow entries which don't have "x" as pw_passwd.
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* Add any missing shadow entries.
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*/
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pw_rewind();
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while ((pw = pw_next())) {
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sp = spw_locate(pw->pw_name);
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if (sp) {
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/* do we need to update this entry? */
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if (strcmp(pw->pw_passwd, SHADOW_PASSWD_STRING) == 0)
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continue;
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/* update existing shadow entry */
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spent = *sp;
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} else {
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/* add new shadow entry */
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memset(&spent, 0, sizeof spent);
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spent.sp_namp = pw->pw_name;
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spent.sp_min = getdef_num("PASS_MIN_DAYS", -1);
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spent.sp_max = getdef_num("PASS_MAX_DAYS", -1);
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spent.sp_warn = getdef_num("PASS_WARN_AGE", -1);
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spent.sp_inact = -1;
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spent.sp_expire = -1;
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spent.sp_flag = -1;
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}
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spent.sp_pwdp = pw->pw_passwd;
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spent.sp_lstchg = time((time_t *) 0) / (24L*3600L);
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if (!spw_update(&spent)) {
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fprintf(stderr,
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_("%s: can't update shadow entry for %s\n"),
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Prog, spent.sp_namp);
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fail_exit(E_FAILURE);
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}
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/* remove password from /etc/passwd */
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pwent = *pw;
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pwent.pw_passwd = SHADOW_PASSWD_STRING; /* XXX warning: const */
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if (!pw_update(&pwent)) {
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fprintf(stderr,
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_("%s: can't update passwd entry for %s\n"),
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Prog, pwent.pw_name);
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fail_exit(E_FAILURE);
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}
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}
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if (!spw_close()) {
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fprintf(stderr, _("%s: can't update shadow file\n"), Prog);
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fail_exit(E_FAILURE);
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}
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if (!pw_close()) {
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fprintf(stderr, _("%s: can't update passwd file\n"), Prog);
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fail_exit(E_FAILURE);
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}
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chmod(PASSWD_FILE "-", 0600); /* /etc/passwd- (backup file) */
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spw_unlock();
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pw_unlock();
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exit(E_SUCCESS);
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}
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