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) {
 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         else if (ok_shell(pw->pw_shell))
 122                 /*
 123                  * Make shell a restricted field.  Ugly with a
 124                  * necklace, but there's not much else to do.
 125                  */
 126                 (void)fprintf(fp, "Shell: %s\n",
 127                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 128         else
 129           list[E_SHELL].restricted = 1;
 130         bp = pw->pw_gecos;
 131
 132         p = strsep(&bp, ",");
 133         if (p)
 134           list[E_NAME].save = strdup(p);
 135         if (!list[E_NAME].restricted || !uid)
 136           (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
 137
 138         p = strsep(&bp, ",");
 139         if (p)
 140           list[E_LOCATE].save = strdup(p);
 141         if (!list[E_LOCATE].restricted || !uid)
 142           (void)fprintf(fp, "Location: %s\n", p ? p : "");
 143
 144         p = strsep(&bp, ",");
 145         if (p)
 146           list[E_BPHONE].save = strdup(p);
 147         if (!list[E_BPHONE].restricted || !uid)
 148           (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
 149
 150         p = strsep(&bp, ",");
 151         if (p)
 152           list[E_HPHONE].save = strdup(p);
 153         if (!list[E_HPHONE].restricted || !uid)
 154           (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");
 155
 156         (void)fchown(fd, getuid(), getgid());
 157         (void)fclose(fp);
 158 }
 159
 160 int
 161 verify(pw)
 162         struct passwd *pw;
 163 {
 164         ENTRY *ep;
 165         char *p;
 166         struct stat sb;
 167         FILE *fp;
 168         int len;
 169         char buf[LINE_MAX];
 170
 171         if (!(fp = fopen(tempname, "r")))
 172                 pw_error(tempname, 1, 1);
 173         if (fstat(fileno(fp), &sb))
 174                 pw_error(tempname, 1, 1);
 175         if (sb.st_size == 0) {
 176                 warnx("corrupted temporary file");
 177                 goto bad;
 178         }
 179         while (fgets(buf, sizeof(buf), fp)) {
 180                 if (!buf[0] || buf[0] == '#')
 181                         continue;
 182                 if (!(p = strchr(buf, '\n'))) {
 183                         warnx("line too long");
 184                         goto bad;
 185                 }
 186                 *p = '\0';
 187                 for (ep = list;; ++ep) {
 188                         if (!ep->prompt) {
 189                                 warnx("unrecognized field");
 190                                 goto bad;
 191                         }
 192                         if (!strncasecmp(buf, ep->prompt, ep->len)) {
 193                                 if (ep->restricted && uid) {
 194                                         warnx(
 195                                             "you may not change the %s field",
 196                                                 ep->prompt);
 197                                         goto bad;
 198                                 }
 199                                 if (!(p = strchr(buf, ':'))) {
 200                                         warnx("line corrupted");
 201                                         goto bad;
 202                                 }
 203                                 while (isspace(*++p));
 204                                 if (ep->except && strpbrk(p, ep->except)) {
 205                                         warnx(
 206                                    "illegal character in the \"%s\" field",
 207                                             ep->prompt);
 208                                         goto bad;
 209                                 }
 210                                 if ((ep->func)(p, pw, ep)) {
 211 bad:                                    (void)fclose(fp);
 212                                         return (0);
 213                                 }
 214                                 break;
 215                         }
 216                 }
 217         }
 218         (void)fclose(fp);
 219
 220         /* Build the gecos field. */
 221         len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
 222             strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) + 4;
 223         if (!(p = malloc(len)))
 224                 err(1, NULL);
 225         (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s", list[E_NAME].save,
 226             list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);
 227
 228         if (snprintf(buf, sizeof(buf),
 229             "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 230             pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
 231             pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 232             pw->pw_shell) >= sizeof(buf)) {
 233                 warnx("entries too long");
 234                 return (0);
 235         }
 236         return (pw_scan(buf, pw));
 237 }