text: /*-
   * Copyright (c) 1990, 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.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 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.
   *
   * @(#)edit.c	8.3 (Berkeley) 4/2/94
   * $FreeBSD: src/usr.bin/chpass/edit.c,v 1.23 2003/04/09 18:18:42 des Exp $
   * $DragonFly: src/usr.bin/chpass/edit.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
   */
  
  #include <sys/param.h>
  #include <sys/stat.h>
  
  #include <ctype.h>
  #include <err.h>
  #include <errno.h>
  #include <paths.h>
  #include <pwd.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include <pw_scan.h>
  #include <libutil.h>
  
  #include "chpass.h"
  
  static int display(const char *tfn, struct passwd *pw);
  static struct passwd *verify(const char *tfn, struct passwd *pw);
  
  struct passwd *
  edit(const char *tfn, struct passwd *pw)
  {
  	struct passwd *npw;
  	char *line;
  	size_t len;
  
  	if (display(tfn, pw) == -1)
  		return (NULL);
  	for (;;) {
  		switch (pw_edit(1)) {
  		case -1:
  			return (NULL);
  		case 0:
  			return (pw_dup(pw));
  		default:
  			break;
  		}
  		if ((npw = verify(tfn, pw)) != NULL)
  			return (npw);
  		free(npw);
  		printf("re-edit the password file? ");
  		fflush(stdout);
  		if ((line = fgetln(stdin, &len)) == NULL) {
  			warn("fgetln()");
  			return (NULL);
  		}
  		if (len > 0 && (*line == 'N' || *line == 'n'))
  			return (NULL);
  	}
  }
  
  /*
   * display --
   *	print out the file for the user to edit; strange side-effect:
   *	set conditional flag if the user gets to edit the shell.
   */
  static int
  display(const char *tfn, struct passwd *pw)
  {
  	FILE *fp;
  	char *bp, *gecos, *p;
  
  	if ((fp = fopen(tfn, "w")) == NULL) {
  		warn("%s", tfn);
  		return (-1);
  	}
  
  	fprintf(fp, "#Changing user information for %s.\n", pw->pw_name);
  	if (master_mode) {
  		fprintf(fp, "Login: %s\n", pw->pw_name);
  		fprintf(fp, "Password: %s\n", pw->pw_passwd);
  		fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
  		fprintf(fp, "Gid [# or name]: %lu\n",
  		    (unsigned long)pw->pw_gid);
  		fprintf(fp, "Change [month day year]: %s\n",
  		    ttoa(pw->pw_change));
  		fprintf(fp, "Expire [month day year]: %s\n",
  		    ttoa(pw->pw_expire));
  		fprintf(fp, "Class: %s\n", pw->pw_class);
  		fprintf(fp, "Home directory: %s\n", pw->pw_dir);
  		fprintf(fp, "Shell: %s\n",
  		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
  	}
  	/* Only admin can change "restricted" shells. */
  #if 0
  	else if (ok_shell(pw->pw_shell))
  		/*
  		 * Make shell a restricted field.  Ugly with a
  		 * necklace, but there's not much else to do.
  		 */
  #else
  	else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) ||
  	    master_mode)
  		/*
  		 * If change not restrict (table.c) and standard shell
  		 *	OR if root, then allow editing of shell.
  		 */
  #endif
  		fprintf(fp, "Shell: %s\n",
  		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
  	else
  		list[E_SHELL].restricted = 1;
  
  	if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) {
  		warn(NULL);
  		fclose(fp);
  		return (-1);
  	}
  
  	p = strsep(&bp, ",");
  	p = strdup(p ? p : "");
  	list[E_NAME].save = p;
  	if (!list[E_NAME].restricted || master_mode)
  		fprintf(fp, "Full Name: %s\n", p);
  
  	p = strsep(&bp, ",");
  	p = strdup(p ? p : "");
  	list[E_LOCATE].save = p;
  	if (!list[E_LOCATE].restricted || master_mode)
  		fprintf(fp, "Office Location: %s\n", p);
  
  	p = strsep(&bp, ",");
  	p = strdup(p ? p : "");
  	list[E_BPHONE].save = p;
  	if (!list[E_BPHONE].restricted || master_mode)
  		fprintf(fp, "Office Phone: %s\n", p);
  
  	p = strsep(&bp, ",");
  	p = strdup(p ? p : "");
  	list[E_HPHONE].save = p;
  	if (!list[E_HPHONE].restricted || master_mode)
  		fprintf(fp, "Home Phone: %s\n", p);
  
  	bp = strdup(bp ? bp : "");
  	list[E_OTHER].save = bp;
  	if (!list[E_OTHER].restricted || master_mode)
  		fprintf(fp, "Other information: %s\n", bp);
  
  	free(gecos);
  
  	fchown(fileno(fp), getuid(), getgid());
  	fclose(fp);
  	return (0);
  }
  
  static struct passwd *
  verify(const char *tfn, struct passwd *pw)
  {
  	struct passwd *npw;
  	ENTRY *ep;
  	char *buf, *p, *val;
  	struct stat sb;
  	FILE *fp;
  	int line;
  	size_t len;
  
  	if ((pw = pw_dup(pw)) == NULL)
  		return (NULL);
  	if ((fp = fopen(tfn, "r")) == NULL ||
  	    fstat(fileno(fp), &sb) == -1) {
  		warn("%s", tfn);
  		free(pw);
  		return (NULL);
  	}
  	if (sb.st_size == 0) {
  		warnx("corrupted temporary file");
  		fclose(fp);
  		free(pw);
  		return (NULL);
  	}
  	val = NULL;
  	for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) {
  		if (*buf == '\0' || *buf == '#')
  			continue;
  		while (len > 0 && isspace(buf[len - 1]))
  			--len;
  		for (ep = list;; ++ep) {
  			if (!ep->prompt) {
  				warnx("%s: unrecognized field on line %d",
  				    tfn, line);
  				goto bad;
  			}
  			if (ep->len > len)
  				continue;
  			if (strncasecmp(buf, ep->prompt, ep->len) != 0)
  				continue;
  			if (ep->restricted && !master_mode) {
  				warnx("%s: you may not change the %s field",
  				    tfn, ep->prompt);
  				goto bad;
  			}
  			for (p = buf; p < buf + len && *p != ':'; ++p)
  				/* nothing */ ;
  			if (*p != ':') {
  				warnx("%s: line %d corrupted", tfn, line);
  				goto bad;
  			}
  			while (++p < buf + len && isspace(*p))
  				/* nothing */ ;
  			free(val);
  			asprintf(&val, "%.*s", (int)(buf + len - p), p);
  			if (val == NULL)
  				goto bad;
  			if (ep->except && strpbrk(val, ep->except)) {
  				warnx("%s: invalid character in \"%s\" field '%s'",
  				    tfn, ep->prompt, val);
  				goto bad;
  			}
  			if ((ep->func)(val, pw, ep))
  				goto bad;
  			break;
  		}
  	}
  	free(val);
  	fclose(fp);
  
  	/* Build the gecos field. */
  	len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save,
  	    list[E_LOCATE].save, list[E_BPHONE].save,
  	    list[E_HPHONE].save, list[E_OTHER].save);
  	if (p == NULL) {
  		warn("asprintf()");
  		free(pw);
  		return (NULL);
  	}
  	while (len > 0 && p[len - 1] == ',')
  		p[--len] = '\0';
  	pw->pw_gecos = p;
  	buf = pw_make(pw);
  	free(pw);
  	free(p);
  	if (buf == NULL) {
  		warn("pw_make()");
  		return (NULL);
  	}
  	npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER);
  	free(buf);
  	return (npw);
  bad:
  	free(pw);
  	free(val);
  	fclose(fp);
  	return (NULL);
  }
  