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  * $FreeBSD$
  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 <md5.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
  54 #include <pw_scan.h>
  55 #include <pw_util.h>
  56
  57 #include "chpass.h"
  58 #ifdef YP
  59 #include "pw_yp.h"
  60 #endif /* YP */
  61
  62 extern char *tempname;
  63
  64 void
  65 edit(pw)
  66         struct passwd *pw;
  67 {
  68         struct stat begin, end;
  69         char *begin_sum, *end_sum;
  70
  71         for (;;) {
  72                 if (stat(tempname, &begin))
  73                         pw_error(tempname, 1, 1);
  74                 begin_sum = MD5File(tempname, (char *)NULL);
  75                 pw_edit(1);
  76                 if (stat(tempname, &end))
  77                         pw_error(tempname, 1, 1);
  78                 end_sum = MD5File(tempname, (char *)NULL);
  79                 if ((begin.st_mtime == end.st_mtime) &&
  80                     (strcmp(begin_sum, end_sum) == 0)) {
  81                         warnx("no changes made");
  82                         pw_error(NULL, 0, 0);
  83                 }
  84                 free(begin_sum);
  85                 free(end_sum);
  86                 if (verify(pw))
  87                         break;
  88                 pw_prompt();
  89         }
  90 }
  91
  92 /*
  93  * display --
  94  *      print out the file for the user to edit; strange side-effect:
  95  *      set conditional flag if the user gets to edit the shell.
  96  */
  97 void
  98 display(fd, pw)
  99         int fd;
 100         struct passwd *pw;
 101 {
 102         FILE *fp;
 103         char *bp, *p, *ttoa();
 104
 105         if (!(fp = fdopen(fd, "w")))
 106                 pw_error(tempname, 1, 1);
 107
 108         (void)fprintf(fp,
 109 #ifdef YP
 110             "#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
 111         if (!uid && (!_use_yp || suser_override)) {
 112 #else
 113             "#Changing user database information for %s.\n", pw->pw_name);
 114         if (!uid) {
 115 #endif /* YP */
 116                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 117                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 118                 (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
 119                 (void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
 120                 (void)fprintf(fp, "Change [month day year]: %s\n",
 121                     ttoa(pw->pw_change));
 122                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 123                     ttoa(pw->pw_expire));
 124                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 125                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 126                 (void)fprintf(fp, "Shell: %s\n",
 127                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 128         }
 129         /* Only admin can change "restricted" shells. */
 130 #if 0
 131         else if (ok_shell(pw->pw_shell))
 132                 /*
 133                  * Make shell a restricted field.  Ugly with a
 134                  * necklace, but there's not much else to do.
 135                  */
 136 #else
 137         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || !uid)
 138                 /*
 139                  * If change not restrict (table.c) and standard shell
 140                  *      OR if root, then allow editing of shell.
 141                  */
 142 #endif
 143                 (void)fprintf(fp, "Shell: %s\n",
 144                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 145         else
 146           list[E_SHELL].restricted = 1;
 147         bp = pw->pw_gecos;
 148
 149         p = strsep(&bp, ",");
 150         p = strdup(p ? p : "");
 151         list[E_NAME].save = p;
 152         if (!list[E_NAME].restricted || !uid)
 153           (void)fprintf(fp, "Full Name: %s\n", p);
 154
 155         p = strsep(&bp, ",");
 156         p = strdup(p ? p : "");
 157         list[E_LOCATE].save = p;
 158         if (!list[E_LOCATE].restricted || !uid)
 159           (void)fprintf(fp, "Office Location: %s\n", p);
 160
 161         p = strsep(&bp, ",");
 162         p = strdup(p ? p : "");
 163         list[E_BPHONE].save = p;
 164         if (!list[E_BPHONE].restricted || !uid)
 165           (void)fprintf(fp, "Office Phone: %s\n", p);
 166
 167         p = strsep(&bp, ",");
 168         p = strdup(p ? p : "");
 169         list[E_HPHONE].save = p;
 170         if (!list[E_HPHONE].restricted || !uid)
 171           (void)fprintf(fp, "Home Phone: %s\n", p);
 172
 173         bp = strdup(bp ? bp : "");
 174         list[E_OTHER].save = bp;
 175         if (!list[E_OTHER].restricted || !uid)
 176           (void)fprintf(fp, "Other information: %s\n", bp);
 177
 178         (void)fchown(fd, getuid(), getgid());
 179         (void)fclose(fp);
 180 }
 181
 182 int
 183 verify(pw)
 184         struct passwd *pw;
 185 {
 186         ENTRY *ep;
 187         char *p;
 188         struct stat sb;
 189         FILE *fp;
 190         int len, line;
 191         static char buf[LINE_MAX];
 192
 193         if (!(fp = fopen(tempname, "r")))
 194                 pw_error(tempname, 1, 1);
 195         if (fstat(fileno(fp), &sb))
 196                 pw_error(tempname, 1, 1);
 197         if (sb.st_size == 0) {
 198                 warnx("corrupted temporary file");
 199                 goto bad;
 200         }
 201         line = 0;
 202         while (fgets(buf, sizeof(buf), fp)) {
 203                 line++;
 204                 if (!buf[0] || buf[0] == '#')
 205                         continue;
 206                 if (!(p = strchr(buf, '\n'))) {
 207                         warnx("line %d too long", line);
 208                         goto bad;
 209                 }
 210                 *p = '\0';
 211                 for (ep = list;; ++ep) {
 212                         if (!ep->prompt) {
 213                                 warnx("unrecognized field on line %d", line);
 214                                 goto bad;
 215                         }
 216                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 217                                 if (ep->restricted && uid) {
 218                                         warnx(
 219                                             "you may not change the %s field",
 220                                                 ep->prompt);
 221                                         goto bad;
 222                                 }
 223                                 if (!(p = strchr(buf, ':'))) {
 224                                         warnx("line %d corrupted", line);
 225                                         goto bad;
 226                                 }
 227                                 while (isspace(*++p));
 228                                 if (ep->except && strpbrk(p, ep->except)) {
 229                                         warnx(
 230                                    "illegal character in the \"%s\" field",
 231                                             ep->prompt);
 232                                         goto bad;
 233                                 }
 234                                 if ((ep->func)(p, pw, ep)) {
 235 bad:                                    (void)fclose(fp);
 236                                         return (0);
 237                                 }
 238                                 break;
 239                         }
 240                 }
 241         }
 242         (void)fclose(fp);
 243
 244         /* Build the gecos field. */
 245         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 246             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) +
 247             strlen(list[E_OTHER].save) + 5;
 248         if (!(p = malloc(len)))
 249                 err(1, NULL);
 250         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 251             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save,
 252             list[E_OTHER].save);
 253
 254         while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
 255                 pw->pw_gecos[len - 1] = '\0';
 256
 257         if (snprintf(buf, sizeof(buf),
 258             "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 259             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 260             pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 261             pw->pw_shell) >= sizeof(buf)) {
 262                 warnx("entries too long");
 263                 free(p);
 264                 return (0);
 265         }
 266         free(p);
 267         return (pw_scan(buf, pw));
 268 }