chpass/edit.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      $Id: edit.c,v 1.13 1999/02/23 02:41:26 ghelmer Exp $
  34  */
  35
  36 #ifndef lint
  37 static const char sccsid[] = "@(#)edit.c        8.3 (Berkeley) 4/2/94";
  38 #endif /* not lint */
  39
  40 #include <sys/param.h>
  41 #include <sys/stat.h>
  42
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <paths.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include <pw_scan.h>
  54 #include <pw_util.h>
  55
  56 #include "chpass.h"
  57 #ifdef YP
  58 #include "pw_yp.h"
  59 #endif /* YP */
  60
  61 extern char *tempname;
  62
  63 void
  64 edit(pw)
  65         struct passwd *pw;
  66 {
  67         struct stat begin, end;
  68
  69         for (;;) {
  70                 if (stat(tempname, &begin))
  71                         pw_error(tempname, 1, 1);
  72                 pw_edit(1);
  73                 if (stat(tempname, &end))
  74                         pw_error(tempname, 1, 1);
  75                 if (begin.st_mtime == end.st_mtime) {
  76                         warnx("no changes made");
  77                         pw_error(NULL, 0, 0);
  78                 }
  79                 if (verify(pw))
  80                         break;
  81                 pw_prompt();
  82         }
  83 }
  84
  85 /*
  86  * display --
  87  *      print out the file for the user to edit; strange side-effect:
  88  *      set conditional flag if the user gets to edit the shell.
  89  */
  90 void
  91 display(fd, pw)
  92         int fd;
  93         struct passwd *pw;
  94 {
  95         FILE *fp;
  96         char *bp, *p, *ttoa();
  97
  98         if (!(fp = fdopen(fd, "w")))
  99                 pw_error(tempname, 1, 1);
 100
 101         (void)fprintf(fp,
 102 #ifdef YP
 103             "#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
 104         if (!uid && (!_use_yp || suser_override)) {
 105 #else
 106             "#Changing user database information for %s.\n", pw->pw_name);
 107         if (!uid) {
 108 #endif /* YP */
 109                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 110                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 111                 (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
 112                 (void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
 113                 (void)fprintf(fp, "Change [month day year]: %s\n",
 114                     ttoa(pw->pw_change));
 115                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 116                     ttoa(pw->pw_expire));
 117                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 118                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 119                 (void)fprintf(fp, "Shell: %s\n",
 120                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 121         }
 122         /* Only admin can change "restricted" shells. */
 123 #if 0
 124         else if (ok_shell(pw->pw_shell))
 125                 /*
 126                  * Make shell a restricted field.  Ugly with a
 127                  * necklace, but there's not much else to do.
 128                  */
 129 #else
 130         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || !uid)
 131                 /*
 132                  * If change not restrict (table.c) and standard shell
 133                  *      OR if root, then allow editing of shell.
 134                  */
 135 #endif
 136                 (void)fprintf(fp, "Shell: %s\n",
 137                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 138         else
 139           list[E_SHELL].restricted = 1;
 140         bp = pw->pw_gecos;
 141
 142         p = strsep(&bp, ",");
 143         if (p)
 144           list[E_NAME].save = strdup(p);
 145         if (!list[E_NAME].restricted || !uid)
 146           (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
 147
 148         p = strsep(&bp, ",");
 149         if (p)
 150           list[E_LOCATE].save = strdup(p);
 151         if (!list[E_LOCATE].restricted || !uid)
 152           (void)fprintf(fp, "Office Location: %s\n", p ? p : "");
 153
 154         p = strsep(&bp, ",");
 155         if (p)
 156           list[E_BPHONE].save = strdup(p);
 157         if (!list[E_BPHONE].restricted || !uid)
 158           (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
 159
 160         p = strsep(&bp, ",");
 161         if (p)
 162           list[E_HPHONE].save = strdup(p);
 163         if (!list[E_HPHONE].restricted || !uid)
 164           (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
 165
 166         if (bp!=NULL)
 167           list[E_OTHER].save = strdup(bp);
 168         if (!list[E_OTHER].restricted || !uid)
 169           (void)fprintf(fp, "Other information: %s\n", bp ? bp : "");
 170
 171         (void)fchown(fd, getuid(), getgid());
 172         (void)fclose(fp);
 173 }
 174
 175 int
 176 verify(pw)
 177         struct passwd *pw;
 178 {
 179         ENTRY *ep;
 180         char *p;
 181         struct stat sb;
 182         FILE *fp;
 183         int len, line;
 184         static char buf[LINE_MAX];
 185
 186         if (!(fp = fopen(tempname, "r")))
 187                 pw_error(tempname, 1, 1);
 188         if (fstat(fileno(fp), &sb))
 189                 pw_error(tempname, 1, 1);
 190         if (sb.st_size == 0) {
 191                 warnx("corrupted temporary file");
 192                 goto bad;
 193         }
 194         line = 0;
 195         while (fgets(buf, sizeof(buf), fp)) {
 196                 line++;
 197                 if (!buf[0] || buf[0] == '#')
 198                         continue;
 199                 if (!(p = strchr(buf, '\n'))) {
 200                         warnx("line %d too long", line);
 201                         goto bad;
 202                 }
 203                 *p = '\0';
 204                 for (ep = list;; ++ep) {
 205                         if (!ep->prompt) {
 206                                 warnx("unrecognized field on line %d", line);
 207                                 goto bad;
 208                         }
 209                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 210                                 if (ep->restricted && uid) {
 211                                         warnx(
 212                                             "you may not change the %s field",
 213                                                 ep->prompt);
 214                                         goto bad;
 215                                 }
 216                                 if (!(p = strchr(buf, ':'))) {
 217                                         warnx("line %d corrupted", line);
 218                                         goto bad;
 219                                 }
 220                                 while (isspace(*++p));
 221                                 if (ep->except && strpbrk(p, ep->except)) {
 222                                         warnx(
 223                                    "illegal character in the \"%s\" field",
 224                                             ep->prompt);
 225                                         goto bad;
 226                                 }
 227                                 if ((ep->func)(p, pw, ep)) {
 228 bad:                                    (void)fclose(fp);
 229                                         return (0);
 230                                 }
 231                                 break;
 232                         }
 233                 }
 234         }
 235         (void)fclose(fp);
 236
 237         /* Build the gecos field. */
 238         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 239             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) +
 240             strlen(list[E_OTHER].save) + 4;
 241         if (!(p = malloc(len)))
 242                 err(1, NULL);
 243         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 244             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save,
 245             list[E_OTHER].save);
 246
 247         while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
 248                 pw->pw_gecos[len - 1] = '\0';
 249
 250         if (snprintf(buf, sizeof(buf),
 251             "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 252             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 253             pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 254             pw->pw_shell) >= sizeof(buf)) {
 255                 warnx("entries too long");
 256                 free(p);
 257                 return (0);
 258         }
 259         free(p);
 260         return (pw_scan(buf, pw));
 261 }