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 char sccsid[] = "@(#)edit.c      8.3 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <paths.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 #include <pw_scan.h>
  52 #include <pw_util.h>
  53
  54 #include "chpass.h"
  55 #ifdef YP
  56 #include "pw_yp.h"
  57 #endif /* YP */
  58
  59 extern char *tempname;
  60
  61 void
  62 edit(pw)
  63         struct passwd *pw;
  64 {
  65         struct stat begin, end;
  66
  67         for (;;) {
  68                 if (stat(tempname, &begin))
  69                         pw_error(tempname, 1, 1);
  70                 pw_edit(1);
  71                 if (stat(tempname, &end))
  72                         pw_error(tempname, 1, 1);
  73                 if (begin.st_mtime == end.st_mtime) {
  74                         warnx("no changes made");
  75                         pw_error(NULL, 0, 0);
  76                 }
  77                 if (verify(pw))
  78                         break;
  79                 pw_prompt();
  80         }
  81 }
  82
  83 /*
  84  * display --
  85  *      print out the file for the user to edit; strange side-effect:
  86  *      set conditional flag if the user gets to edit the shell.
  87  */
  88 void
  89 display(fd, pw)
  90         int fd;
  91         struct passwd *pw;
  92 {
  93         FILE *fp;
  94         char *bp, *p, *ttoa();
  95
  96         if (!(fp = fdopen(fd, "w")))
  97                 pw_error(tempname, 1, 1);
  98
  99         (void)fprintf(fp,
 100 #ifdef YP
 101             "#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
 102         if (!uid && (!_use_yp || suser_override)) {
 103 #else
 104             "#Changing user database information for %s.\n", pw->pw_name);
 105         if (!uid) {
 106 #endif /* YP */
 107                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 108                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 109                 (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
 110                 (void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
 111                 (void)fprintf(fp, "Change [month day year]: %s\n",
 112                     ttoa(pw->pw_change));
 113                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 114                     ttoa(pw->pw_expire));
 115                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 116                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 117                 (void)fprintf(fp, "Shell: %s\n",
 118                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 119         }
 120         /* Only admin can change "restricted" shells. */
 121 #ifdef 0
 122         else if (ok_shell(pw->pw_shell))
 123                 /*
 124                  * Make shell a restricted field.  Ugly with a
 125                  * necklace, but there's not much else to do.
 126                  */
 127 #else
 128         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) || !uid)
 129                 /*
 130                  * If change not restrict (table.c) and standard shell
 131                  *      OR if root, then allow editing of shell.
 132                  */
 133 #endif
 134                 (void)fprintf(fp, "Shell: %s\n",
 135                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 136         else
 137           list[E_SHELL].restricted = 1;
 138         bp = pw->pw_gecos;
 139
 140         p = strsep(&bp, ",");
 141         if (p)
 142           list[E_NAME].save = strdup(p);
 143         if (!list[E_NAME].restricted || !uid)
 144           (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
 145
 146         p = strsep(&bp, ",");
 147         if (p)
 148           list[E_LOCATE].save = strdup(p);
 149         if (!list[E_LOCATE].restricted || !uid)
 150           (void)fprintf(fp, "Location: %s\n", p ? p : "");
 151
 152         p = strsep(&bp, ",");
 153         if (p)
 154           list[E_BPHONE].save = strdup(p);
 155         if (!list[E_BPHONE].restricted || !uid)
 156           (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
 157
 158         p = strsep(&bp, ",");
 159         if (p)
 160           list[E_HPHONE].save = strdup(p);
 161         if (!list[E_HPHONE].restricted || !uid)
 162           (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
 163
 164         (void)fchown(fd, getuid(), getgid());
 165         (void)fclose(fp);
 166 }
 167
 168 int
 169 verify(pw)
 170         struct passwd *pw;
 171 {
 172         ENTRY *ep;
 173         char *p;
 174         struct stat sb;
 175         FILE *fp;
 176         int len;
 177         static char buf[LINE_MAX];
 178
 179         if (!(fp = fopen(tempname, "r")))
 180                 pw_error(tempname, 1, 1);
 181         if (fstat(fileno(fp), &sb))
 182                 pw_error(tempname, 1, 1);
 183         if (sb.st_size == 0) {
 184                 warnx("corrupted temporary file");
 185                 goto bad;
 186         }
 187         while (fgets(buf, sizeof(buf), fp)) {
 188                 if (!buf[0] || buf[0] == '#')
 189                         continue;
 190                 if (!(p = strchr(buf, '\n'))) {
 191                         warnx("line too long");
 192                         goto bad;
 193                 }
 194                 *p = '\0';
 195                 for (ep = list;; ++ep) {
 196                         if (!ep->prompt) {
 197                                 warnx("unrecognized field");
 198                                 goto bad;
 199                         }
 200                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 201                                 if (ep->restricted && uid) {
 202                                         warnx(
 203                                             "you may not change the %s field",
 204                                                 ep->prompt);
 205                                         goto bad;
 206                                 }
 207                                 if (!(p = strchr(buf, ':'))) {
 208                                         warnx("line corrupted");
 209                                         goto bad;
 210                                 }
 211                                 while (isspace(*++p));
 212                                 if (ep->except && strpbrk(p, ep->except)) {
 213                                         warnx(
 214                                    "illegal character in the \"%s\" field",
 215                                             ep->prompt);
 216                                         goto bad;
 217                                 }
 218                                 if ((ep->func)(p, pw, ep)) {
 219 bad:                                    (void)fclose(fp);
 220                                         return (0);
 221                                 }
 222                                 break;
 223                         }
 224                 }
 225         }
 226         (void)fclose(fp);
 227
 228         /* Build the gecos field. */
 229         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 230             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4;
 231         if (!(p = malloc(len)))
 232                 err(1, NULL);
 233         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s", list[E_NAME].save,
 234             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);
 235
 236         while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
 237                 pw->pw_gecos[len - 1] = '\0';
 238
 239         if (snprintf(buf, sizeof(buf),
 240             "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 241             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 242             pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 243             pw->pw_shell) >= sizeof(buf)) {
 244                 warnx("entries too long");
 245                 return (0);
 246         }
 247         return (pw_scan(buf, pw));
 248 }