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
  56 extern char *tempname;
  57
  58 void
  59 edit(pw)
  60         struct passwd *pw;
  61 {
  62         struct stat begin, end;
  63
  64         for (;;) {
  65                 if (stat(tempname, &begin))
  66                         pw_error(tempname, 1, 1);
  67                 pw_edit(1);
  68                 if (stat(tempname, &end))
  69                         pw_error(tempname, 1, 1);
  70                 if (begin.st_mtime == end.st_mtime) {
  71                         warnx("no changes made");
  72                         pw_error(NULL, 0, 0);
  73                 }
  74                 if (verify(pw))
  75                         break;
  76                 pw_prompt();
  77         }
  78 }
  79
  80 /*
  81  * display --
  82  *      print out the file for the user to edit; strange side-effect:
  83  *      set conditional flag if the user gets to edit the shell.
  84  */
  85 void
  86 display(fd, pw)
  87         int fd;
  88         struct passwd *pw;
  89 {
  90         FILE *fp;
  91         char *bp, *p, *ttoa();
  92
  93         if (!(fp = fdopen(fd, "w")))
  94                 pw_error(tempname, 1, 1);
  95
  96         (void)fprintf(fp,
  97             "#Changing user database information for %s.\n", pw->pw_name);
  98         if (!uid) {
  99                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 100                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 101                 (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
 102                 (void)fprintf(fp, "Gid [# or name]: %d\n", pw->pw_gid);
 103                 (void)fprintf(fp, "Change [month day year]: %s\n",
 104                     ttoa(pw->pw_change));
 105                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 106                     ttoa(pw->pw_expire));
 107                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 108                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 109                 (void)fprintf(fp, "Shell: %s\n",
 110                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 111         }
 112         /* Only admin can change "restricted" shells. */
 113         else if (ok_shell(pw->pw_shell))
 114                 /*
 115                  * Make shell a restricted field.  Ugly with a
 116                  * necklace, but there's not much else to do.
 117                  */
 118                 (void)fprintf(fp, "Shell: %s\n",
 119                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 120         else
 121                 list[E_SHELL].restricted = 1;
 122         bp = pw->pw_gecos;
 123         p = strsep(&bp, ",");
 124         (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
 125         p = strsep(&bp, ",");
 126         (void)fprintf(fp, "Location: %s\n", p ? p : "");
 127         p = strsep(&bp, ",");
 128         (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
 129         p = strsep(&bp, ",");
 130         (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
 131
 132         (void)fchown(fd, getuid(), getgid());
 133         (void)fclose(fp);
 134 }
 135
 136 int
 137 verify(pw)
 138         struct passwd *pw;
 139 {
 140         ENTRY *ep;
 141         char *p;
 142         struct stat sb;
 143         FILE *fp;
 144         int len;
 145         char buf[LINE_MAX];
 146
 147         if (!(fp = fopen(tempname, "r")))
 148                 pw_error(tempname, 1, 1);
 149         if (fstat(fileno(fp), &sb))
 150                 pw_error(tempname, 1, 1);
 151         if (sb.st_size == 0) {
 152                 warnx("corrupted temporary file");
 153                 goto bad;
 154         }
 155         while (fgets(buf, sizeof(buf), fp)) {
 156                 if (!buf[0] || buf[0] == '#')
 157                         continue;
 158                 if (!(p = strchr(buf, '\n'))) {
 159                         warnx("line too long");
 160                         goto bad;
 161                 }
 162                 *p = '\0';
 163                 for (ep = list;; ++ep) {
 164                         if (!ep->prompt) {
 165                                 warnx("unrecognized field");
 166                                 goto bad;
 167                         }
 168                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 169                                 if (ep->restricted && uid) {
 170                                         warnx(
 171                                             "you may not change the %s field",
 172                                                 ep->prompt);
 173                                         goto bad;
 174                                 }
 175                                 if (!(p = strchr(buf, ':'))) {
 176                                         warnx("line corrupted");
 177                                         goto bad;
 178                                 }
 179                                 while (isspace(*++p));
 180                                 if (ep->except && strpbrk(p, ep->except)) {
 181                                         warnx(
 182                                    "illegal character in the \"%s\" field",
 183                                             ep->prompt);
 184                                         goto bad;
 185                                 }
 186                                 if ((ep->func)(p, pw, ep)) {
 187 bad:                                    (void)fclose(fp);
 188                                         return (0);
 189                                 }
 190                                 break;
 191                         }
 192                 }
 193         }
 194         (void)fclose(fp);
 195
 196         /* Build the gecos field. */
 197         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 198             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4;
 199         if (!(p = malloc(len)))
 200                 err(1, NULL);
 201         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s", list[E_NAME].save,
 202             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);
 203
 204         if (snprintf(buf, sizeof(buf),
 205             "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 206             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 207             pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 208             pw->pw_shell) >= sizeof(buf)) {
 209                 warnx("entries too long");
 210                 return (0);
 211         }
 212         return (pw_scan(buf, pw));
 213 }