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edit.c revision 1.12
      1 /*	$NetBSD: edit.c,v 1.12 1998/07/26 21:25:16 mycroft Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)edit.c	8.3 (Berkeley) 4/2/94";
     40 #else
     41 __RCSID("$NetBSD: edit.c,v 1.12 1998/07/26 21:25:16 mycroft Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/stat.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <errno.h>
     51 #include <paths.h>
     52 #include <pwd.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 #include <util.h>
     58 
     59 #include "chpass.h"
     60 
     61 void
     62 edit(tempname, pw)
     63 	char *tempname;
     64 	struct passwd *pw;
     65 {
     66 	struct stat begin, end;
     67 
     68 	for (;;) {
     69 		if (stat(tempname, &begin))
     70 			(*Pw_error)(tempname, 1, 1);
     71 		pw_edit(1, tempname);
     72 		if (stat(tempname, &end))
     73 			(*Pw_error)(tempname, 1, 1);
     74 		if (begin.st_mtime == end.st_mtime) {
     75 			warnx("no changes made");
     76 			unlink(tempname);
     77 			(*Pw_error)(NULL, 0, 0);
     78 		}
     79 		if (verify(tempname, pw))
     80 			break;
     81 #ifdef YP
     82 		if (use_yp)
     83 			yppw_prompt();
     84 		else
     85 #endif
     86 			pw_prompt();
     87 	}
     88 }
     89 
     90 /*
     91  * display --
     92  *	print out the file for the user to edit; strange side-effect:
     93  *	set conditional flag if the user gets to edit the shell.
     94  */
     95 void
     96 display(tempname, fd, pw)
     97 	char *tempname;
     98 	int fd;
     99 	struct passwd *pw;
    100 {
    101 	FILE *fp;
    102 	char *bp, *p;
    103 	char chgstr[256], expstr[256];
    104 
    105 	if (!(fp = fdopen(fd, "w")))
    106 		(*Pw_error)(tempname, 1, 1);
    107 
    108 	(void)fprintf(fp,
    109 	    "#Changing user %sdatabase information for %s.\n",
    110 	    use_yp ? "YP " : "", pw->pw_name);
    111 	if (!uid) {
    112 		(void)fprintf(fp, "Login: %s\n", pw->pw_name);
    113 		(void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
    114 		(void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
    115 		(void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
    116 		(void)fprintf(fp, "Change [month day year]: %s\n",
    117 		    ttoa(chgstr, sizeof chgstr, pw->pw_change));
    118 		(void)fprintf(fp, "Expire [month day year]: %s\n",
    119 		    ttoa(expstr, sizeof expstr, pw->pw_expire));
    120 		(void)fprintf(fp, "Class: %s\n", pw->pw_class);
    121 		(void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
    122 		(void)fprintf(fp, "Shell: %s\n",
    123 		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
    124 	}
    125 	/* Only admin can change "restricted" shells. */
    126 	else if (ok_shell(pw->pw_shell))
    127 		/*
    128 		 * Make shell a restricted field.  Ugly with a
    129 		 * necklace, but there's not much else to do.
    130 		 */
    131 		(void)fprintf(fp, "Shell: %s\n",
    132 		    *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
    133 	else
    134 		list[E_SHELL].restricted = 1;
    135 	bp = strdup(pw->pw_gecos);
    136 	p = strsep(&bp, ",");
    137 	(void)fprintf(fp, "Full Name: %s\n", p ? p : "");
    138 	p = strsep(&bp, ",");
    139 	(void)fprintf(fp, "Location: %s\n", p ? p : "");
    140 	p = strsep(&bp, ",");
    141 	(void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
    142 	p = strsep(&bp, ",");
    143 	(void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
    144 
    145 	(void)fchown(fd, getuid(), getgid());
    146 	(void)fclose(fp);
    147 }
    148 
    149 int
    150 verify(tempname, pw)
    151 	char *tempname;
    152 	struct passwd *pw;
    153 {
    154 	ENTRY *ep;
    155 	char *p;
    156 	struct stat sb;
    157 	FILE *fp;
    158 	int len;
    159 	static char buf[LINE_MAX];
    160 
    161 	if (!(fp = fopen(tempname, "r")))
    162 		(*Pw_error)(tempname, 1, 1);
    163 	if (fstat(fileno(fp), &sb))
    164 		(*Pw_error)(tempname, 1, 1);
    165 	if (sb.st_size == 0) {
    166 		warnx("corrupted temporary file");
    167 		goto bad;
    168 	}
    169 	while (fgets(buf, sizeof(buf), fp)) {
    170 		if (!buf[0] || buf[0] == '#')
    171 			continue;
    172 		if (!(p = strchr(buf, '\n'))) {
    173 			warnx("line too long");
    174 			goto bad;
    175 		}
    176 		*p = '\0';
    177 		for (ep = list;; ++ep) {
    178 			if (!ep->prompt) {
    179 				warnx("unrecognized field");
    180 				goto bad;
    181 			}
    182 			if (!strncasecmp(buf, ep->prompt, ep->len)) {
    183 				if (ep->restricted && uid) {
    184 					warnx(
    185 					    "you may not change the %s field",
    186 						ep->prompt);
    187 					goto bad;
    188 				}
    189 				if (!(p = strchr(buf, ':'))) {
    190 					warnx("line corrupted");
    191 					goto bad;
    192 				}
    193 				while (isspace(*++p));
    194 				if (ep->except && strpbrk(p, ep->except)) {
    195 					warnx(
    196 				   "illegal character in the \"%s\" field",
    197 					    ep->prompt);
    198 					goto bad;
    199 				}
    200 				if ((ep->func)(p, pw, ep)) {
    201 bad:					(void)fclose(fp);
    202 					return (0);
    203 				}
    204 				break;
    205 			}
    206 		}
    207 	}
    208 	(void)fclose(fp);
    209 
    210 	/* Build the gecos field. */
    211 	len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
    212 	    strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4;
    213 	if (!(p = malloc(len)))
    214 		err(1, "malloc");
    215 	(void)snprintf(p, len, "%s,%s,%s,%s", list[E_NAME].save,
    216 	    list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);
    217 	pw->pw_gecos = p;
    218 
    219 	if (snprintf(buf, sizeof(buf),
    220 	    "%s:%s:%d:%d:%s:%lu:%lu:%s:%s:%s",
    221 	    pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
    222 	    (u_long)pw->pw_change, (u_long)pw->pw_expire, pw->pw_gecos,
    223 	    pw->pw_dir, pw->pw_shell) >= sizeof(buf)) {
    224 		warnx("entries too long");
    225 		return (0);
    226 	}
    227 	return (pw_scan(buf, pw, (int *)NULL));
    228 }
    229