usr.bin/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  * $FreeBSD: src/usr.bin/chpass/edit.c,v 1.16.2.2 2001/08/02 01:48:22 obrien Exp $
  34  * $DragonFly: src/usr.bin/chpass/edit.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  35  *
  36  * @(#)edit.c   8.3 (Berkeley) 4/2/94
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <errno.h>
  45 #include <md5.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(struct passwd *pw)
  65 {
  66         struct stat begin, end;
  67         char *begin_sum, *end_sum;
  68
  69         for (;;) {
  70                 if (stat(tempname, &begin))
  71                         pw_error(tempname, 1, 1);
  72                 begin_sum = MD5File(tempname, (char *)NULL);
  73                 pw_edit(1);
  74                 if (stat(tempname, &end))
  75                         pw_error(tempname, 1, 1);
  76                 end_sum = MD5File(tempname, (char *)NULL);
  77                 if ((begin.st_mtime == end.st_mtime) &&
  78                     (strcmp(begin_sum, end_sum) == 0)) {
  79                         warnx("no changes made");
  80                         pw_error(NULL, 0, 0);
  81                 }
  82                 free(begin_sum);
  83                 free(end_sum);
  84                 if (verify(pw))
  85                         break;
  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(int fd, struct passwd *pw)
  97 {
  98         FILE *fp;
  99         char *bp, *p, *ttoa();
 100
 101         if (!(fp = fdopen(fd, "w")))
 102                 pw_error(tempname, 1, 1);
 103
 104         (void)fprintf(fp,
 105 #ifdef YP
 106             "#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
 107         if (!uid && (!_use_yp || suser_override)) {
 108 #else
 109             "#Changing user database information for %s.\n", pw->pw_name);
 110         if (!uid) {
 111 #endif /* YP */
 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 [#]: %lu\n", (unsigned long)pw->pw_uid);
 115                 (void)fprintf(fp, "Gid [# or name]: %lu\n",
 116                     (unsigned long)pw->pw_gid);
 117                 (void)fprintf(fp, "Change [month day year]: %s\n",
 118                     ttoa(pw->pw_change));
 119                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 120                     ttoa(pw->pw_expire));
 121                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 122                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 123                 (void)fprintf(fp, "Shell: %s\n",
 124                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 125         }
 126         /* Only admin can change "restricted" shells. */
 127 #if 0
 128         else if (ok_shell(pw->pw_shell))
 129                 /*
 130                  * Make shell a restricted field.  Ugly with a
 131                  * necklace, but there's not much else to do.
 132                  */
 133 #else
 134         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || !uid)
 135                 /*
 136                  * If change not restrict (table.c) and standard shell
 137                  *      OR if root, then allow editing of shell.
 138                  */
 139 #endif
 140                 (void)fprintf(fp, "Shell: %s\n",
 141                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 142         else
 143           list[E_SHELL].restricted = 1;
 144         bp = pw->pw_gecos;
 145
 146         p = strsep(&bp, ",");
 147         p = strdup(p ? p : "");
 148         list[E_NAME].save = p;
 149         if (!list[E_NAME].restricted || !uid)
 150           (void)fprintf(fp, "Full Name: %s\n", p);
 151
 152         p = strsep(&bp, ",");
 153         p = strdup(p ? p : "");
 154         list[E_LOCATE].save = p;
 155         if (!list[E_LOCATE].restricted || !uid)
 156           (void)fprintf(fp, "Office Location: %s\n", p);
 157
 158         p = strsep(&bp, ",");
 159         p = strdup(p ? p : "");
 160         list[E_BPHONE].save = p;
 161         if (!list[E_BPHONE].restricted || !uid)
 162           (void)fprintf(fp, "Office Phone: %s\n", p);
 163
 164         p = strsep(&bp, ",");
 165         p = strdup(p ? p : "");
 166         list[E_HPHONE].save = p;
 167         if (!list[E_HPHONE].restricted || !uid)
 168           (void)fprintf(fp, "Home Phone: %s\n", p);
 169
 170         bp = strdup(bp ? bp : "");
 171         list[E_OTHER].save = bp;
 172         if (!list[E_OTHER].restricted || !uid)
 173           (void)fprintf(fp, "Other information: %s\n", bp);
 174
 175         (void)fchown(fd, getuid(), getgid());
 176         (void)fclose(fp);
 177 }
 178
 179 int
 180 verify(struct passwd *pw)
 181 {
 182         ENTRY *ep;
 183         char *p;
 184         struct stat sb;
 185         FILE *fp;
 186         int len, line;
 187         static char buf[LINE_MAX];
 188
 189         if (!(fp = fopen(tempname, "r")))
 190                 pw_error(tempname, 1, 1);
 191         if (fstat(fileno(fp), &sb))
 192                 pw_error(tempname, 1, 1);
 193         if (sb.st_size == 0) {
 194                 warnx("corrupted temporary file");
 195                 goto bad;
 196         }
 197         line = 0;
 198         while (fgets(buf, sizeof(buf), fp)) {
 199                 line++;
 200                 if (!buf[0] || buf[0] == '#')
 201                         continue;
 202                 if (!(p = strchr(buf, '\n'))) {
 203                         warnx("line %d too long", line);
 204                         goto bad;
 205                 }
 206                 *p = '\0';
 207                 for (ep = list;; ++ep) {
 208                         if (!ep->prompt) {
 209                                 warnx("unrecognized field on line %d", line);
 210                                 goto bad;
 211                         }
 212                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 213                                 if (ep->restricted && uid) {
 214                                         warnx(
 215                                             "you may not change the %s field",
 216                                                 ep->prompt);
 217                                         goto bad;
 218                                 }
 219                                 if (!(p = strchr(buf, ':'))) {
 220                                         warnx("line %d corrupted", line);
 221                                         goto bad;
 222                                 }
 223                                 while (isspace(*++p));
 224                                 if (ep->except && strpbrk(p, ep->except)) {
 225                                         warnx(
 226                                    "illegal character in the \"%s\" field",
 227                                             ep->prompt);
 228                                         goto bad;
 229                                 }
 230                                 if ((ep->func)(p, pw, ep)) {
 231 bad:                                    (void)fclose(fp);
 232                                         return (0);
 233                                 }
 234                                 break;
 235                         }
 236                 }
 237         }
 238         (void)fclose(fp);
 239
 240         /* Build the gecos field. */
 241         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 242             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) +
 243             strlen(list[E_OTHER].save) + 5;
 244         if (!(p = malloc(len)))
 245                 err(1, NULL);
 246         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 247             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save,
 248             list[E_OTHER].save);
 249
 250         while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
 251                 pw->pw_gecos[len - 1] = '\0';
 252
 253         if (snprintf(buf, sizeof(buf),
 254             "%s:%s:%lu:%lu:%s:%ld:%ld:%s:%s:%s",
 255             pw->pw_name, pw->pw_passwd, (unsigned long)pw->pw_uid,
 256             (unsigned long)pw->pw_gid, pw->pw_class, (long)pw->pw_change,
 257             (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 258             pw->pw_shell) >= sizeof(buf)) {
 259                 warnx("entries too long");
 260                 free(p);
 261                 return (0);
 262         }
 263         free(p);
 264         return (pw_scan(buf, pw));
 265 }