chpass/edit.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 2002 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * Portions of this software were developed for the FreeBSD Project by
   8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
   9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  10  * ("CBOSS"), as part of the DARPA CHATS research program.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #if 0
  42 #ifndef lint
  43 static char sccsid[] = "@(#)edit.c      8.3 (Berkeley) 4/2/94";
  44 #endif /* not lint */
  45 #endif
  46
  47 #include <sys/cdefs.h>
  48 __FBSDID("$FreeBSD$");
  49
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <paths.h>
  57 #include <pwd.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 #include <pw_scan.h>
  64 #include <libutil.h>
  65
  66 #include "chpass.h"
  67
  68 static int display(const char *tfn, struct passwd *pw);
  69 static struct passwd *verify(const char *tfn, struct passwd *pw);
  70
  71 struct passwd *
  72 edit(const char *tfn, struct passwd *pw)
  73 {
  74         struct passwd *npw;
  75         char *line;
  76         size_t len;
  77
  78         if (display(tfn, pw) == -1)
  79                 return (NULL);
  80         for (;;) {
  81                 switch (pw_edit(1)) {
  82                 case -1:
  83                         return (NULL);
  84                 case 0:
  85                         return (pw_dup(pw));
  86                 default:
  87                         break;
  88                 }
  89                 if ((npw = verify(tfn, pw)) != NULL)
  90                         return (npw);
  91                 free(npw);
  92                 printf("re-edit the password file? ");
  93                 fflush(stdout);
  94                 if ((line = fgetln(stdin, &len)) == NULL) {
  95                         warn("fgetln()");
  96                         return (NULL);
  97                 }
  98                 if (len > 0 && (*line == 'N' || *line == 'n'))
  99                         return (NULL);
 100         }
 101 }
 102
 103 /*
 104  * display --
 105  *      print out the file for the user to edit; strange side-effect:
 106  *      set conditional flag if the user gets to edit the shell.
 107  */
 108 static int
 109 display(const char *tfn, struct passwd *pw)
 110 {
 111         FILE *fp;
 112         char *bp, *p;
 113
 114         if ((fp = fopen(tfn, "w")) == NULL) {
 115                 warn("%s", tfn);
 116                 return (-1);
 117         }
 118
 119         (void)fprintf(fp,
 120             "#Changing user information for %s.\n", pw->pw_name);
 121         if (master_mode) {
 122                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 123                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 124                 (void)fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
 125                 (void)fprintf(fp, "Gid [# or name]: %lu\n",
 126                     (unsigned long)pw->pw_gid);
 127                 (void)fprintf(fp, "Change [month day year]: %s\n",
 128                     ttoa(pw->pw_change));
 129                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 130                     ttoa(pw->pw_expire));
 131                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 132                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 133                 (void)fprintf(fp, "Shell: %s\n",
 134                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 135         }
 136         /* Only admin can change "restricted" shells. */
 137 #if 0
 138         else if (ok_shell(pw->pw_shell))
 139                 /*
 140                  * Make shell a restricted field.  Ugly with a
 141                  * necklace, but there's not much else to do.
 142                  */
 143 #else
 144         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) ||
 145             master_mode)
 146                 /*
 147                  * If change not restrict (table.c) and standard shell
 148                  *      OR if root, then allow editing of shell.
 149                  */
 150 #endif
 151                 (void)fprintf(fp, "Shell: %s\n",
 152                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 153         else
 154           list[E_SHELL].restricted = 1;
 155         bp = pw->pw_gecos;
 156
 157         p = strsep(&bp, ",");
 158         p = strdup(p ? p : "");
 159         list[E_NAME].save = p;
 160         if (!list[E_NAME].restricted || master_mode)
 161           (void)fprintf(fp, "Full Name: %s\n", p);
 162
 163         p = strsep(&bp, ",");
 164         p = strdup(p ? p : "");
 165         list[E_LOCATE].save = p;
 166         if (!list[E_LOCATE].restricted || master_mode)
 167           (void)fprintf(fp, "Office Location: %s\n", p);
 168
 169         p = strsep(&bp, ",");
 170         p = strdup(p ? p : "");
 171         list[E_BPHONE].save = p;
 172         if (!list[E_BPHONE].restricted || master_mode)
 173           (void)fprintf(fp, "Office Phone: %s\n", p);
 174
 175         p = strsep(&bp, ",");
 176         p = strdup(p ? p : "");
 177         list[E_HPHONE].save = p;
 178         if (!list[E_HPHONE].restricted || master_mode)
 179           (void)fprintf(fp, "Home Phone: %s\n", p);
 180
 181         bp = strdup(bp ? bp : "");
 182         list[E_OTHER].save = bp;
 183         if (!list[E_OTHER].restricted || master_mode)
 184           (void)fprintf(fp, "Other information: %s\n", bp);
 185
 186         (void)fchown(fileno(fp), getuid(), getgid());
 187         (void)fclose(fp);
 188         return (0);
 189 }
 190
 191 static struct passwd *
 192 verify(const char *tfn, struct passwd *pw)
 193 {
 194         struct passwd *npw;
 195         ENTRY *ep;
 196         char *buf, *p, *val;
 197         struct stat sb;
 198         FILE *fp;
 199         int line;
 200         size_t len;
 201
 202         if ((pw = pw_dup(pw)) == NULL)
 203                 return (NULL);
 204         if ((fp = fopen(tfn, "r")) == NULL ||
 205             fstat(fileno(fp), &sb) == -1) {
 206                 warn("%s", tfn);
 207                 free(pw);
 208                 return (NULL);
 209         }
 210         if (sb.st_size == 0) {
 211                 warnx("corrupted temporary file");
 212                 fclose(fp);
 213                 free(pw);
 214                 return (NULL);
 215         }
 216         val = NULL;
 217         for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) {
 218                 if (*buf == '\0' || *buf == '#')
 219                         continue;
 220                 while (len > 0 && isspace(buf[len - 1]))
 221                         --len;
 222                 for (ep = list;; ++ep) {
 223                         if (!ep->prompt) {
 224                                 warnx("%s: unrecognized field on line %d",
 225                                     tfn, line);
 226                                 goto bad;
 227                         }
 228                         if (ep->len > len)
 229                                 continue;
 230                         if (strncasecmp(buf, ep->prompt, ep->len) != 0)
 231                                 continue;
 232                         if (ep->restricted && !master_mode) {
 233                                 warnx("%s: you may not change the %s field",
 234                                     tfn, ep->prompt);
 235                                 goto bad;
 236                         }
 237                         for (p = buf; p < buf + len && *p != ':'; ++p)
 238                                 /* nothing */ ;
 239                         if (*p != ':') {
 240                                 warnx("%s: line %d corrupted", tfn, line);
 241                                 goto bad;
 242                         }
 243                         while (++p < buf + len && isspace(*p))
 244                                 /* nothing */ ;
 245                         free(val);
 246                         asprintf(&val, "%.*s", (int)(buf + len - p), p);
 247                         if (val == NULL)
 248                                 goto bad;
 249                         if (ep->except && strpbrk(val, ep->except)) {
 250                                 warnx("%s: invalid character in \"%s\" field '%s'",
 251                                     tfn, ep->prompt, val);
 252                                 goto bad;
 253                         }
 254                         if ((ep->func)(val, pw, ep))
 255                                 goto bad;
 256                         break;
 257                 }
 258         }
 259         free(val);
 260         fclose(fp);
 261
 262         /* Build the gecos field. */
 263         len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 264             list[E_LOCATE].save, list[E_BPHONE].save,
 265             list[E_HPHONE].save, list[E_OTHER].save);
 266         if (p == NULL) {
 267                 warn("asprintf()");
 268                 free(pw);
 269                 return (NULL);
 270         }
 271         while (len > 0 && p[len - 1] == ',')
 272                 p[--len] = '\0';
 273         pw->pw_gecos = p;
 274         buf = pw_make(pw);
 275         free(pw);
 276         free(p);
 277         if (buf == NULL) {
 278                 warn("pw_make()");
 279                 return (NULL);
 280         }
 281         npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER);
 282         free(buf);
 283         return (npw);
 284 bad:
 285         free(pw);
 286         free(val);
 287         fclose(fp);
 288         return (NULL);
 289 }