chpass/edit.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1990, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 2002 Networks Associates Technology, Inc.
   7  * All rights reserved.
   8  *
   9  * Portions of this software were developed for the FreeBSD Project by
  10  * ThinkSec AS and NAI Labs, the Security Research Division of Network
  11  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
  12  * ("CBOSS"), as part of the DARPA CHATS research program.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *      This product includes software developed by the University of
  25  *      California, Berkeley and its contributors.
  26  * 4. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  */
  42
  43 #if 0
  44 #ifndef lint
  45 static char sccsid[] = "@(#)edit.c      8.3 (Berkeley) 4/2/94";
  46 #endif /* not lint */
  47 #endif
  48
  49 #include <sys/cdefs.h>
  50 __FBSDID("$FreeBSD$");
  51
  52 #include <sys/param.h>
  53 #include <sys/stat.h>
  54
  55 #include <ctype.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <paths.h>
  59 #include <pwd.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #include <pw_scan.h>
  66 #include <libutil.h>
  67
  68 #include "chpass.h"
  69
  70 static int display(const char *tfn, struct passwd *pw);
  71 static struct passwd *verify(const char *tfn, struct passwd *pw);
  72
  73 struct passwd *
  74 edit(const char *tfn, struct passwd *pw)
  75 {
  76         struct passwd *npw;
  77         char *line;
  78         size_t len;
  79
  80         if (display(tfn, pw) == -1)
  81                 return (NULL);
  82         for (;;) {
  83                 switch (pw_edit(1)) {
  84                 case -1:
  85                         return (NULL);
  86                 case 0:
  87                         return (pw_dup(pw));
  88                 default:
  89                         break;
  90                 }
  91                 if ((npw = verify(tfn, pw)) != NULL)
  92                         return (npw);
  93                 free(npw);
  94                 printf("re-edit the password file? ");
  95                 fflush(stdout);
  96                 if ((line = fgetln(stdin, &len)) == NULL) {
  97                         warn("fgetln()");
  98                         return (NULL);
  99                 }
 100                 if (len > 0 && (*line == 'N' || *line == 'n'))
 101                         return (NULL);
 102         }
 103 }
 104
 105 /*
 106  * display --
 107  *      print out the file for the user to edit; strange side-effect:
 108  *      set conditional flag if the user gets to edit the shell.
 109  */
 110 static int
 111 display(const char *tfn, struct passwd *pw)
 112 {
 113         FILE *fp;
 114         char *bp, *gecos, *p;
 115
 116         if ((fp = fopen(tfn, "w")) == NULL) {
 117                 warn("%s", tfn);
 118                 return (-1);
 119         }
 120
 121         (void)fprintf(fp,
 122             "#Changing user information for %s.\n", pw->pw_name);
 123         if (master_mode) {
 124                 (void)fprintf(fp, "Login: %s\n", pw->pw_name);
 125                 (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
 126                 (void)fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
 127                 (void)fprintf(fp, "Gid [# or name]: %lu\n",
 128                     (unsigned long)pw->pw_gid);
 129                 (void)fprintf(fp, "Change [month day year]: %s\n",
 130                     ttoa(pw->pw_change));
 131                 (void)fprintf(fp, "Expire [month day year]: %s\n",
 132                     ttoa(pw->pw_expire));
 133                 (void)fprintf(fp, "Class: %s\n", pw->pw_class);
 134                 (void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 135                 (void)fprintf(fp, "Shell: %s\n",
 136                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 137         }
 138         /* Only admin can change "restricted" shells. */
 139 #if 0
 140         else if (ok_shell(pw->pw_shell))
 141                 /*
 142                  * Make shell a restricted field.  Ugly with a
 143                  * necklace, but there's not much else to do.
 144                  */
 145 #else
 146         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) ||
 147             master_mode)
 148                 /*
 149                  * If change not restrict (table.c) and standard shell
 150                  *      OR if root, then allow editing of shell.
 151                  */
 152 #endif
 153                 (void)fprintf(fp, "Shell: %s\n",
 154                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 155         else
 156                 list[E_SHELL].restricted = 1;
 157
 158         if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) {
 159                 warn(NULL);
 160                 fclose(fp);
 161                 return (-1);
 162         }
 163
 164         p = strsep(&bp, ",");
 165         p = strdup(p ? p : "");
 166         list[E_NAME].save = p;
 167         if (!list[E_NAME].restricted || master_mode)
 168           (void)fprintf(fp, "Full Name: %s\n", p);
 169
 170         p = strsep(&bp, ",");
 171         p = strdup(p ? p : "");
 172         list[E_LOCATE].save = p;
 173         if (!list[E_LOCATE].restricted || master_mode)
 174           (void)fprintf(fp, "Office Location: %s\n", p);
 175
 176         p = strsep(&bp, ",");
 177         p = strdup(p ? p : "");
 178         list[E_BPHONE].save = p;
 179         if (!list[E_BPHONE].restricted || master_mode)
 180           (void)fprintf(fp, "Office Phone: %s\n", p);
 181
 182         p = strsep(&bp, ",");
 183         p = strdup(p ? p : "");
 184         list[E_HPHONE].save = p;
 185         if (!list[E_HPHONE].restricted || master_mode)
 186           (void)fprintf(fp, "Home Phone: %s\n", p);
 187
 188         bp = strdup(bp ? bp : "");
 189         list[E_OTHER].save = bp;
 190         if (!list[E_OTHER].restricted || master_mode)
 191           (void)fprintf(fp, "Other information: %s\n", bp);
 192
 193         free(gecos);
 194
 195         (void)fchown(fileno(fp), getuid(), getgid());
 196         (void)fclose(fp);
 197         return (0);
 198 }
 199
 200 static struct passwd *
 201 verify(const char *tfn, struct passwd *pw)
 202 {
 203         struct passwd *npw;
 204         ENTRY *ep;
 205         char *buf, *p, *val;
 206         struct stat sb;
 207         FILE *fp;
 208         int line;
 209         size_t len;
 210
 211         if ((pw = pw_dup(pw)) == NULL)
 212                 return (NULL);
 213         if ((fp = fopen(tfn, "r")) == NULL ||
 214             fstat(fileno(fp), &sb) == -1) {
 215                 warn("%s", tfn);
 216                 free(pw);
 217                 return (NULL);
 218         }
 219         if (sb.st_size == 0) {
 220                 warnx("corrupted temporary file");
 221                 fclose(fp);
 222                 free(pw);
 223                 return (NULL);
 224         }
 225         val = NULL;
 226         for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) {
 227                 if (*buf == '\0' || *buf == '#')
 228                         continue;
 229                 while (len > 0 && isspace(buf[len - 1]))
 230                         --len;
 231                 for (ep = list;; ++ep) {
 232                         if (!ep->prompt) {
 233                                 warnx("%s: unrecognized field on line %d",
 234                                     tfn, line);
 235                                 goto bad;
 236                         }
 237                         if (ep->len > len)
 238                                 continue;
 239                         if (strncasecmp(buf, ep->prompt, ep->len) != 0)
 240                                 continue;
 241                         if (ep->restricted && !master_mode) {
 242                                 warnx("%s: you may not change the %s field",
 243                                     tfn, ep->prompt);
 244                                 goto bad;
 245                         }
 246                         for (p = buf; p < buf + len && *p != ':'; ++p)
 247                                 /* nothing */ ;
 248                         if (*p != ':') {
 249                                 warnx("%s: line %d corrupted", tfn, line);
 250                                 goto bad;
 251                         }
 252                         while (++p < buf + len && isspace(*p))
 253                                 /* nothing */ ;
 254                         free(val);
 255                         asprintf(&val, "%.*s", (int)(buf + len - p), p);
 256                         if (val == NULL)
 257                                 goto bad;
 258                         if (ep->except && strpbrk(val, ep->except)) {
 259                                 warnx("%s: invalid character in \"%s\" field '%s'",
 260                                     tfn, ep->prompt, val);
 261                                 goto bad;
 262                         }
 263                         if ((ep->func)(val, pw, ep))
 264                                 goto bad;
 265                         break;
 266                 }
 267         }
 268         free(val);
 269         fclose(fp);
 270
 271         /* Build the gecos field. */
 272         len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 273             list[E_LOCATE].save, list[E_BPHONE].save,
 274             list[E_HPHONE].save, list[E_OTHER].save);
 275         if (p == NULL) {
 276                 warn("asprintf()");
 277                 free(pw);
 278                 return (NULL);
 279         }
 280         while (len > 0 && p[len - 1] == ',')
 281                 p[--len] = '\0';
 282         pw->pw_gecos = p;
 283         buf = pw_make(pw);
 284         free(pw);
 285         free(p);
 286         if (buf == NULL) {
 287                 warn("pw_make()");
 288                 return (NULL);
 289         }
 290         npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER);
 291         free(buf);
 292         return (npw);
 293 bad:
 294         free(pw);
 295         free(val);
 296         fclose(fp);
 297         return (NULL);
 298 }