text: /*-
   * Copyright (c) 1988, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   * Copyright (c) 2002 Networks Associates Technology, Inc.
   * All rights reserved.
   *
   * Portions of this software were developed for the FreeBSD Project by
   * ThinkSec AS and NAI Labs, the Security Research Division of Network
   * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   * ("CBOSS"), as part of the DARPA CHATS research program.
   *
   * 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.
   * 4. 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.
   *
   * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
   * @(#)chpass.c	8.4 (Berkeley) 4/2/94
   * $FreeBSD: src/usr.bin/chpass/chpass.c,v 1.28 2006/09/25 15:06:24 marck Exp $
   * $DragonFly: src/usr.bin/chpass/chpass.c,v 1.4 2003/11/03 19:31:28 eirikn Exp $
   */
  
  #include <sys/param.h>
  
  #include <err.h>
  #include <errno.h>
  #include <pwd.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #ifdef YP
  #include <ypclnt.h>
  #endif
  
  #include <pw_scan.h>
  #include <libutil.h>
  
  #include "chpass.h"
  
  int master_mode;
  
  static void	baduser(void);
  static void	usage(void);
  
  int
  main(int argc, char **argv)
  {
  	enum { NEWSH, LOADENTRY, EDITENTRY, NEWPW, NEWEXP } op;
  	struct passwd lpw, *old_pw, *pw;
  	int ch, pfd, tfd;
  	const char *password;
  	char *cryptpw;
  	char *arg = NULL;
  	uid_t uid;
  #ifdef YP
  	struct ypclnt *ypclnt;
  	const char *yp_domain = NULL, *yp_host = NULL;
  #endif
  
  	pw = old_pw = NULL;
  	op = EDITENTRY;
  #ifdef YP
  	while ((ch = getopt(argc, argv, "a:p:s:e:d:h:loy")) != -1)
  #else
  	while ((ch = getopt(argc, argv, "a:p:s:e:")) != -1)
  #endif
  		switch (ch) {
  		case 'a':
  			op = LOADENTRY;
  			arg = optarg;
  			break;
  		case 's':
  			op = NEWSH;
  			arg = optarg;
  			break;
  		case 'p':
  			op = NEWPW;
  			arg = optarg;
  			break;
  		case 'e':
  			op = NEWEXP;
  			arg = optarg;
  			break;
  #ifdef YP
  		case 'd':
  			yp_domain = optarg;
  			break;
  		case 'h':
  			yp_host = optarg;
  			break;
  		case 'l':
  		case 'o':
  		case 'y':
  			/* compatibility */
  			break;
  #endif
  		case '?':
  		default:
  			usage();
  		}
  
  	argc -= optind;
  	argv += optind;
  
  	if (argc > 1)
  		usage();
  
  	uid = getuid();
  
  	if (op == EDITENTRY || op == NEWSH || op == NEWPW || op == NEWEXP) {
  		if (argc == 0) {
  			if ((pw = getpwuid(uid)) == NULL)
  				errx(1, "unknown user: uid %lu",
  				    (unsigned long)uid);
  		} else {
  			if ((pw = getpwnam(*argv)) == NULL)
  				errx(1, "unknown user: %s", *argv);
  			if (uid != 0 && uid != pw->pw_uid)
  				baduser();
  		}
  
  		/* Make a copy for later verification */
  		if ((pw = pw_dup(pw)) == NULL ||
  		    (old_pw = pw_dup(pw)) == NULL)
  			err(1, "pw_dup");
  	}
  
  #ifdef YP
  	if (pw != NULL && (pw->pw_fields & _PWF_SOURCE) == _PWF_NIS) {
  		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
  		master_mode = (ypclnt != NULL &&
  		    ypclnt_connect(ypclnt) != -1 &&
  		    ypclnt_havepasswdd(ypclnt) == 1);
  		ypclnt_free(ypclnt);
  	} else
  #endif
  	master_mode = (uid == 0);
  
  	if (op == NEWSH) {
  		/* protect p_shell -- it thinks NULL is /bin/sh */
  		if (!arg[0])
  			usage();
  		if (p_shell(arg, pw, NULL) == -1)
  			exit(1);
  	}
  
  	if (op == NEWEXP) {
  		if (uid)	/* only root can change expire */
  			baduser();
  		if (p_expire(arg, pw, NULL) == -1)
  			exit(1);
  	}
  
  	if (op == LOADENTRY) {
  		if (uid)
  			baduser();
  		pw = &lpw;
  		old_pw = NULL;
  		if (!__pw_scan(arg, pw, _PWSCAN_WARN|_PWSCAN_MASTER))
  			exit(1);
  	}
  
  	if (op == NEWPW) {
  		if (uid)
  			baduser();
  
  		if (strchr(arg, ':'))
  			errx(1, "invalid format for password");
  		pw->pw_passwd = arg;
  	}
  
  	if (op == EDITENTRY) {
  		/*
  		 * We don't really need pw_*() here, but pw_edit() (used
  		 * by edit()) is just too useful...
  		 */
  		if (pw_init(NULL, NULL))
  			err(1, "pw_init()");
  		if ((tfd = pw_tmp(-1)) == -1) {
  			pw_fini();
  			err(1, "pw_tmp()");
  		}
  		free(pw);
  		pw = edit(pw_tempname(), old_pw);
  		pw_fini();
  		if (pw == NULL)
  			err(1, "edit()");
  		/*
  		 * pw_equal does not check for crypted passwords, so we
  		 * should do it explicitly
  		 */
  		if (pw_equal(old_pw, pw) &&
  		    strcmp(old_pw->pw_passwd, pw->pw_passwd) == 0)
  			errx(0, "user information unchanged");
  	}
  
  	if (old_pw && !master_mode) {
  		password = getpass("Password: ");
  		cryptpw = crypt(password, old_pw->pw_passwd);
  		if (cryptpw == NULL || strcmp(cryptpw, old_pw->pw_passwd) != 0)
  			baduser();
  	} else {
  		password = "";
  	}
  
  	if (old_pw != NULL)
  		pw->pw_fields |= (old_pw->pw_fields & _PWF_SOURCE);
  	switch (pw->pw_fields & _PWF_SOURCE) {
  #ifdef YP
  	case _PWF_NIS:
  		ypclnt = ypclnt_new(yp_domain, "passwd.byname", yp_host);
  		if (ypclnt == NULL ||
  		    ypclnt_connect(ypclnt) == -1 ||
  		    ypclnt_passwd(ypclnt, pw, password) == -1) {
  			warnx("%s", ypclnt->error);
  			ypclnt_free(ypclnt);
  			exit(1);
  		}
  		ypclnt_free(ypclnt);
  		errx(0, "NIS user information updated");
  #endif /* YP */
  	case 0:
  	case _PWF_FILES:
  		if (pw_init(NULL, NULL))
  			err(1, "pw_init()");
  		if ((pfd = pw_lock()) == -1) {
  			pw_fini();
  			err(1, "pw_lock()");
  		}
  		if ((tfd = pw_tmp(-1)) == -1) {
  			pw_fini();
  			err(1, "pw_tmp()");
  		}
  		if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
  			pw_fini();
  			err(1, "pw_copy");
  		}
  		if (pw_mkdb(pw->pw_name) == -1) {
  			pw_fini();
  			err(1, "pw_mkdb()");
  		}
  		pw_fini();
  		errx(0, "user information updated");
  		break;
  	default:
  		errx(1, "unsupported passwd source");
  	}
  }
  
  static void
  baduser(void)
  {
  
  	errx(1, "%s", strerror(EACCES));
  }
  
  static void
  usage(void)
  {
  
  	fprintf(stderr,
  	    "usage: chpass%s %s [user]\n",
  #ifdef YP
  	    " [-d domain] [-h host]",
  #else
  	    "",
  #endif
  	    "[-a list] [-p encpass] [-s shell] [-e mmm dd yy]");
  	exit(1);
  }
  