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
  34 #ifndef lint
  35 static const char sccsid[] = "@(#)edit.c        8.3 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  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 <md5.h>
  48 #include <paths.h>
  49 #include <pwd.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 #include <pw_scan.h>
  56 #include <pw_util.h>
  57
  58 #include "chpass.h"
  59 #ifdef YP
  60 #include "pw_yp.h"
  61 #endif /* YP */
  62
  63 extern char *tempname;
  64
  65 void
  66 edit(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(int fd, struct passwd *pw)
  99 {
 100         FILE *fp;
 101         char *bp, *p;
 102
 103         if (!(fp = fdopen(fd, "w")))
 104                 pw_error(tempname, 1, 1);
 105
 106         (void)fprintf(fp,
 107 #ifdef YP
 108             "#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
 109         if (!uid && (!_use_yp || suser_override)) {
 110 #else
 111             "#Changing user database information for %s.\n", pw->pw_name);
 112         if (!uid) {
 113 #endif /* YP */
 114                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 115                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 116                 (void)fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
 117                 (void)fprintf(fp, "Gid [# or name]: %lu\n",
 118                     (unsigned long)pw->pw_gid);
 119                 (void)fprintf(fp, "Change [month day year]: %s\n",
 120                     ttoa(pw->pw_change));
 121                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 122                     ttoa(pw->pw_expire));
 123                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 124                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 125                 (void)fprintf(fp, "Shell: %s\n",
 126                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 127         }
 128         /* Only admin can change "restricted" shells. */
 129 #if 0
 130         else if (ok_shell(pw->pw_shell))
 131                 /*
 132                  * Make shell a restricted field.  Ugly with a
 133                  * necklace, but there's not much else to do.
 134                  */
 135 #else
 136         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || !uid)
 137                 /*
 138                  * If change not restrict (table.c) and standard shell
 139                  *      OR if root, then allow editing of shell.
 140                  */
 141 #endif
 142                 (void)fprintf(fp, "Shell: %s\n",
 143                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 144         else
 145           list[E_SHELL].restricted = 1;
 146         bp = pw->pw_gecos;
 147
 148         p = strsep(&bp, ",");
 149         p = strdup(p ? p : "");
 150         list[E_NAME].save = p;
 151         if (!list[E_NAME].restricted || !uid)
 152           (void)fprintf(fp, "Full Name: %s\n", p);
 153
 154         p = strsep(&bp, ",");
 155         p = strdup(p ? p : "");
 156         list[E_LOCATE].save = p;
 157         if (!list[E_LOCATE].restricted || !uid)
 158           (void)fprintf(fp, "Office Location: %s\n", p);
 159
 160         p = strsep(&bp, ",");
 161         p = strdup(p ? p : "");
 162         list[E_BPHONE].save = p;
 163         if (!list[E_BPHONE].restricted || !uid)
 164           (void)fprintf(fp, "Office Phone: %s\n", p);
 165
 166         p = strsep(&bp, ",");
 167         p = strdup(p ? p : "");
 168         list[E_HPHONE].save = p;
 169         if (!list[E_HPHONE].restricted || !uid)
 170           (void)fprintf(fp, "Home Phone: %s\n", p);
 171
 172         bp = strdup(bp ? bp : "");
 173         list[E_OTHER].save = bp;
 174         if (!list[E_OTHER].restricted || !uid)
 175           (void)fprintf(fp, "Other information: %s\n", bp);
 176
 177         (void)fchown(fd, getuid(), getgid());
 178         (void)fclose(fp);
 179 }
 180
 181 int
 182 verify(struct passwd *pw)
 183 {
 184         ENTRY *ep;
 185         char *p;
 186         struct stat sb;
 187         FILE *fp;
 188         int len, line;
 189         static char buf[LINE_MAX];
 190
 191         if (!(fp = fopen(tempname, "r")))
 192                 pw_error(tempname, 1, 1);
 193         if (fstat(fileno(fp), &sb))
 194                 pw_error(tempname, 1, 1);
 195         if (sb.st_size == 0) {
 196                 warnx("corrupted temporary file");
 197                 goto bad;
 198         }
 199         line = 0;
 200         while (fgets(buf, sizeof(buf), fp)) {
 201                 line++;
 202                 if (!buf[0] || buf[0] == '#')
 203                         continue;
 204                 if (!(p = strchr(buf, '\n'))) {
 205                         warnx("line %d too long", line);
 206                         goto bad;
 207                 }
 208                 *p = '\0';
 209                 for (ep = list;; ++ep) {
 210                         if (!ep->prompt) {
 211                                 warnx("unrecognized field on line %d", line);
 212                                 goto bad;
 213                         }
 214                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 215                                 if (ep->restricted && uid) {
 216                                         warnx(
 217                                             "you may not change the %s field",
 218                                                 ep->prompt);
 219                                         goto bad;
 220                                 }
 221                                 if (!(p = strchr(buf, ':'))) {
 222                                         warnx("line %d corrupted", line);
 223                                         goto bad;
 224                                 }
 225                                 while (isspace(*++p));
 226                                 if (ep->except && strpbrk(p, ep->except)) {
 227                                         warnx(
 228                                    "illegal character in the \"%s\" field",
 229                                             ep->prompt);
 230                                         goto bad;
 231                                 }
 232                                 if ((ep->func)(p, pw, ep)) {
 233 bad:                                    (void)fclose(fp);
 234                                         return (0);
 235                                 }
 236                                 break;
 237                         }
 238                 }
 239         }
 240         (void)fclose(fp);
 241
 242         /* Build the gecos field. */
 243         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 244             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) +
 245             strlen(list[E_OTHER].save) + 5;
 246         if (!(p = malloc(len)))
 247                 err(1, NULL);
 248         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 249             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save,
 250             list[E_OTHER].save);
 251
 252         while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
 253                 pw->pw_gecos[len - 1] = '\0';
 254
 255         if (snprintf(buf, sizeof(buf),
 256             "%s:%s:%lu:%lu:%s:%ld:%ld:%s:%s:%s",
 257             pw->pw_name, pw->pw_passwd, (unsigned long)pw->pw_uid,
 258             (unsigned long)pw->pw_gid, pw->pw_class, (long)pw->pw_change,
 259             (long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 260             pw->pw_shell) >= (int)sizeof(buf)) {
 261                 warnx("entries too long");
 262                 free(p);
 263                 return (0);
 264         }
 265         free(p);
 266         return (__pw_scan(buf, pw, _PWSCAN_WARN|_PWSCAN_MASTER));
 267 }