/*      $NetBSD: local_passwd.c,v 1.37 2024/05/18 19:03:31 andvar Exp $ */

/*-
* Copyright (c) 1990, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)local_passwd.c    8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: local_passwd.c,v 1.37 2024/05/18 19:03:31 andvar Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include <login_cap.h>
#include <syslog.h>

#include "extern.h"

static uid_t uid;

static char *
getnewpasswd(struct passwd *pw, int min_pw_len)
{
       int tries;
       char *p, *t;
       char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN+1];
       char option[LINE_MAX], *key, *opt;

       (void)printf("Changing local password for %s.\n", pw->pw_name);

       if (uid && pw->pw_passwd[0] &&
           strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
           pw->pw_passwd)) {
               errno = EACCES;
               syslog(LOG_AUTH | LOG_NOTICE,
                      "user %s (UID %lu) failed to change the "
                      "local password of user %s: %m",
                      pw->pw_name, (unsigned long)uid, pw->pw_name);
               pw_error(NULL, 1, 1);
       }

       for (buf[0] = '\0', tries = 0;;) {
               p = getpass("New password:");
               if (!*p) {
                       (void)printf("Password unchanged.\n");
                       pw_error(NULL, 0, 0);
               }
               if (min_pw_len > 0 && (int)strlen(p) < min_pw_len) {
                       (void) printf("Password is too short.\n");
                       continue;
               }
               if (strlen(p) <= 5 && ++tries < 2) {
                       (void)printf("Please enter a longer password.\n");
                       continue;
               }
               for (t = p; *t && islower((unsigned char)*t); ++t);
               if (!*t && ++tries < 2) {
                       (void)printf("Please don't use an all-lower case "
                                    "password.\nUnusual capitalization, "
                                    "control characters or digits are "
                                    "suggested.\n");
                       continue;
               }
               (void)strlcpy(buf, p, sizeof(buf));
               if (!strcmp(buf, getpass("Retype new password:")))
                       break;
               (void)printf("Mismatch; try again, EOF to quit.\n");
       }

       pw_getpwconf(option, sizeof(option), pw, "localcipher");
       opt = option;
       key = strsep(&opt, ",");
       if(pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) {
               warn("Couldn't generate salt");
               pw_error(NULL, 0, 0);
       }
       return(crypt(buf, salt));
}

#ifdef USE_PAM

void
pwlocal_usage(const char *prefix)
{

       (void) fprintf(stderr, "%s %s [-d files | -l] [user]\n",
           prefix, getprogname());
}

void
pwlocal_process(const char *username, int argc, char **argv)
{
       struct passwd *pw;
       struct passwd old_pw;
       time_t old_change;
       int pfd, tfd;
       int min_pw_len = 0;
       int pw_expiry  = 0;
       int ch;
#ifdef LOGIN_CAP
       login_cap_t *lc;
#endif

       while ((ch = getopt(argc, argv, "l")) != -1) {
               switch (ch) {
               case 'l':
                       /*
                        * Absorb the -l that may have gotten us here.
                        */
                       break;

               default:
                       usage();
                       /* NOTREACHED */
               }
       }

       argc -= optind;
       argv += optind;

       switch (argc) {
       case 0:
               /* username already provided */
               break;
       case 1:
               username = argv[0];
               break;
       default:
               usage();
               /* NOTREACHED */
       }

       if (!(pw = getpwnam(username)))
               errx(1, "unknown user %s", username);

       uid = getuid();
       if (uid && uid != pw->pw_uid)
               errx(1, "%s", strerror(EACCES));

       /* Save the old pw information for comparing on pw_copy(). */
       old_pw = *pw;

       /*
        * Get class restrictions for this user, then get the new password.
        */
#ifdef LOGIN_CAP
       if((lc = login_getclass(pw->pw_class)) != NULL) {
               min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0);
               pw_expiry  = (int) login_getcaptime(lc, "passwordtime", 0, 0);
               login_close(lc);
       }
#endif

       pw->pw_passwd = getnewpasswd(pw, min_pw_len);
       old_change = pw->pw_change;
       pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0;

       /*
        * Now that the user has given us a new password, let us
        * change the database.
        */
       pw_init();
       tfd = pw_lock(0);
       if (tfd < 0) {
               warnx ("The passwd file is busy, waiting...");
               tfd = pw_lock(10);
               if (tfd < 0)
                       errx(1, "The passwd file is still busy, "
                            "try again later.");
       }

       pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
       if (pfd < 0)
               pw_error(_PATH_MASTERPASSWD, 1, 1);

       pw_copy(pfd, tfd, pw, &old_pw);

       if (pw_mkdb(username, old_change == pw->pw_change) < 0)
               pw_error(NULL, 0, 1);

       syslog(LOG_AUTH | LOG_INFO,
              "user %s (UID %lu) successfully changed "
              "the local password of user %s",
              uid ? username : "root", (unsigned long)uid, username);
}

#else /* ! USE_PAM */

static int force_local;

int
local_init(const char *progname)
{
       force_local = 0;
       return (0);
}

int
local_arg(char ch, const char *arg)
{
       switch (ch) {
       case 'l':
               force_local = 1;
               break;
       default:
               return(0);
       }
       return(1);
}

int
local_arg_end(void)
{
       if (force_local)
               return(PW_USE_FORCE);
       return(PW_USE);
}

void
local_end(void)
{
       /* NOOP */
}

int
local_chpw(const char *uname)
{
       struct passwd *pw;
       struct passwd old_pw;
       time_t old_change;
       int pfd, tfd;
       int min_pw_len = 0;
       int pw_expiry  = 0;
#ifdef LOGIN_CAP
       login_cap_t *lc;
#endif

       if (!(pw = getpwnam(uname))) {
               warnx("unknown user %s", uname);
               return (1);
       }

       uid = getuid();
       if (uid && uid != pw->pw_uid) {
               warnx("%s", strerror(EACCES));
               return (1);
       }

       /* Save the old pw information for comparing on pw_copy(). */
       old_pw = *pw;

       /*
        * Get class restrictions for this user, then get the new password.
        */
#ifdef LOGIN_CAP
       if((lc = login_getclass(pw->pw_class))) {
               min_pw_len = (int) login_getcapnum(lc, "minpasswordlen", 0, 0);
               pw_expiry  = (int) login_getcaptime(lc, "passwordtime", 0, 0);
               login_close(lc);
       }
#endif

       pw->pw_passwd = getnewpasswd(pw, min_pw_len);
       old_change = pw->pw_change;
       pw->pw_change = pw_expiry ? pw_expiry + time(NULL) : 0;

       /*
        * Now that the user has given us a new password, let us
        * change the database.
        */
       pw_init();
       tfd = pw_lock(0);
       if (tfd < 0) {
               warnx ("The passwd file is busy, waiting...");
               tfd = pw_lock(10);
               if (tfd < 0)
                       errx(1, "The passwd file is still busy, "
                            "try again later.");
       }

       pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
       if (pfd < 0)
               pw_error(_PATH_MASTERPASSWD, 1, 1);

       pw_copy(pfd, tfd, pw, &old_pw);

       if (pw_mkdb(uname, old_change == pw->pw_change) < 0)
               pw_error(NULL, 0, 1);

       syslog(LOG_AUTH | LOG_INFO,
              "user %s (UID %lu) successfully changed "
              "the local password of user %s",
              uid ? uname : "root", (unsigned long)uid, uname);

       return (0);
}

#endif /* USE_PAM */

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