usr.bin/chpass/edit.c

   1 /*      $NetBSD: edit.c,v 1.20 2009/04/11 12:10:02 lukem 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)edit.c      8.3 (Berkeley) 4/2/94";
  36 #else
  37 __RCSID("$NetBSD: edit.c,v 1.20 2009/04/11 12:10:02 lukem Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <paths.h>
  48 #include <pwd.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <fcntl.h>
  54 #include <util.h>
  55
  56 #include "chpass.h"
  57
  58 void
  59 edit(char *tempname, struct passwd *pw)
  60 {
  61         struct stat begin, end;
  62
  63         for (;;) {
  64                 if (stat(tempname, &begin))
  65                         (*Pw_error)(tempname, 1, 1);
  66                 pw_edit(1, tempname);
  67                 if (stat(tempname, &end))
  68                         (*Pw_error)(tempname, 1, 1);
  69                 if (begin.st_mtime == end.st_mtime) {
  70                         warnx("no changes made");
  71                         (*Pw_error)(NULL, 0, 0);
  72                 }
  73                 if (verify(tempname, pw))
  74                         break;
  75 #ifdef YP
  76                 if (use_yp)
  77                         yppw_prompt();
  78                 else
  79 #endif
  80                         pw_prompt();
  81         }
  82 }
  83
  84 /*
  85  * display --
  86  *      print out the file for the user to edit; strange side-effect:
  87  *      set conditional flag if the user gets to edit the shell.
  88  */
  89 void
  90 display(char *tempname, int fd, struct passwd *pw)
  91 {
  92         FILE *fp;
  93         char *bp, *p;
  94         char chgstr[256], expstr[256];
  95
  96         if (!(fp = fdopen(fd, "w")))
  97                 (*Pw_error)(tempname, 1, 1);
  98
  99         (void)fprintf(fp,
 100             "#Changing user %sdatabase information for %s.\n",
 101             use_yp ? "YP " : "", pw->pw_name);
 102         if (!uid) {
 103                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 104                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 105                 (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
 106                 (void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
 107                 (void)fprintf(fp, "Change [month day year]: %s\n",
 108                     ttoa(chgstr, sizeof chgstr, pw->pw_change));
 109                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 110                     ttoa(expstr, sizeof expstr, pw->pw_expire));
 111                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 112                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 113                 (void)fprintf(fp, "Shell: %s\n",
 114                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 115         }
 116         /* Only admin can change "restricted" shells. */
 117         else if (ok_shell(pw->pw_shell))
 118                 /*
 119                  * Make shell a restricted field.  Ugly with a
 120                  * necklace, but there's not much else to do.
 121                  */
 122                 (void)fprintf(fp, "Shell: %s\n",
 123                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 124         else
 125                 list[E_SHELL].restricted = 1;
 126         bp = strdup(pw->pw_gecos);
 127         if (!bp) {
 128                 err(1, "strdup");
 129                 /*NOTREACHED*/
 130         }
 131         p = strsep(&bp, ",");
 132         (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
 133         p = strsep(&bp, ",");
 134         (void)fprintf(fp, "Location: %s\n", p ? p : "");
 135         p = strsep(&bp, ",");
 136         (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
 137         p = strsep(&bp, ",");
 138         (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
 139
 140         (void)fchown(fd, getuid(), getgid());
 141         (void)fclose(fp);
 142 }
 143
 144 int
 145 verify(char *tempname, struct passwd *pw)
 146 {
 147         ENTRY *ep;
 148         char *p;
 149         struct stat sb;
 150         FILE *fp = NULL;
 151         int len, fd;
 152         static char buf[LINE_MAX];
 153
 154 #ifdef __minix
 155         if ((fd = open(tempname, O_RDONLY)) == -1 ||
 156             (fp = fdopen(fd, "r")) == NULL)
 157 #else
 158         if ((fd = open(tempname, O_RDONLY|O_NOFOLLOW)) == -1 ||
 159             (fp = fdopen(fd, "r")) == NULL)
 160 #endif
 161                 (*Pw_error)(tempname, 1, 1);
 162         if (fstat(fd, &sb))
 163                 (*Pw_error)(tempname, 1, 1);
 164         if (sb.st_size == 0 || sb.st_nlink != 1) {
 165                 warnx("corrupted temporary file");
 166                 goto bad;
 167         }
 168         while (fgets(buf, sizeof(buf), fp)) {
 169                 if (!buf[0] || buf[0] == '#')
 170                         continue;
 171                 if (!(p = strchr(buf, '\n'))) {
 172                         warnx("line too long");
 173                         goto bad;
 174                 }
 175                 *p = '\0';
 176                 for (ep = list;; ++ep) {
 177                         if (!ep->prompt) {
 178                                 warnx("unrecognized field");
 179                                 goto bad;
 180                         }
 181                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 182                                 if (ep->restricted && uid) {
 183                                         warnx(
 184                                             "you may not change the %s field",
 185                                                 ep->prompt);
 186                                         goto bad;
 187                                 }
 188                                 if (!(p = strchr(buf, ':'))) {
 189                                         warnx("line corrupted");
 190                                         goto bad;
 191                                 }
 192                                 while (isspace((unsigned char)*++p));
 193                                 if (ep->except && strpbrk(p, ep->except)) {
 194                                         warnx(
 195                                    "illegal character in the \"%s\" field",
 196                                             ep->prompt);
 197                                         goto bad;
 198                                 }
 199                                 if ((ep->func)(p, pw, ep)) {
 200 bad:                                    (void)fclose(fp);
 201                                         return (0);
 202                                 }
 203                                 break;
 204                         }
 205                 }
 206         }
 207         (void)fclose(fp);
 208
 209         /* Build the gecos field. */
 210         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 211             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4;
 212         if (!(p = malloc(len)))
 213                 err(1, "malloc");
 214         (void)snprintf(p, len, "%s,%s,%s,%s", list[E_NAME].save,
 215             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);
 216         pw->pw_gecos = p;
 217
 218         if (snprintf(buf, sizeof(buf),
 219             "%s:%s:%d:%d:%s:%lu:%lu:%s:%s:%s",
 220             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 221             (u_long)pw->pw_change, (u_long)pw->pw_expire, pw->pw_gecos,
 222             pw->pw_dir, pw->pw_shell) >= (int)sizeof(buf)) {
 223                 warnx("entries too long");
 224                 return (0);
 225         }
 226         return (pw_scan(buf, pw, (int *)NULL));
 227 }