usr.bin/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  * @(#)edit.c   8.3 (Berkeley) 4/2/94
  41  * $FreeBSD: src/usr.bin/chpass/edit.c,v 1.23 2003/04/09 18:18:42 des Exp $
  42  * $DragonFly: src/usr.bin/chpass/edit.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <paths.h>
  52 #include <pwd.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57
  58 #include <pw_scan.h>
  59 #include <libutil.h>
  60
  61 #include "chpass.h"
  62
  63 static int display(const char *tfn, struct passwd *pw);
  64 static struct passwd *verify(const char *tfn, struct passwd *pw);
  65
  66 struct passwd *
  67 edit(const char *tfn, struct passwd *pw)
  68 {
  69         struct passwd *npw;
  70         char *line;
  71         size_t len;
  72
  73         if (display(tfn, pw) == -1)
  74                 return (NULL);
  75         for (;;) {
  76                 switch (pw_edit(1)) {
  77                 case -1:
  78                         return (NULL);
  79                 case 0:
  80                         return (pw_dup(pw));
  81                 default:
  82                         break;
  83                 }
  84                 if ((npw = verify(tfn, pw)) != NULL)
  85                         return (npw);
  86                 free(npw);
  87                 printf("re-edit the password file? ");
  88                 fflush(stdout);
  89                 if ((line = fgetln(stdin, &len)) == NULL) {
  90                         warn("fgetln()");
  91                         return (NULL);
  92                 }
  93                 if (len > 0 && (*line == 'N' || *line == 'n'))
  94                         return (NULL);
  95         }
  96 }
  97
  98 /*
  99  * display --
 100  *      print out the file for the user to edit; strange side-effect:
 101  *      set conditional flag if the user gets to edit the shell.
 102  */
 103 static int
 104 display(const char *tfn, struct passwd *pw)
 105 {
 106         FILE *fp;
 107         char *bp, *gecos, *p;
 108
 109         if ((fp = fopen(tfn, "w")) == NULL) {
 110                 warn("%s", tfn);
 111                 return (-1);
 112         }
 113
 114         fprintf(fp, "#Changing user information for %s.\n", pw->pw_name);
 115         if (master_mode) {
 116                 fprintf(fp, "Login: %s\n", pw->pw_name);
 117                 fprintf(fp, "Password: %s\n", pw->pw_passwd);
 118                 fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
 119                 fprintf(fp, "Gid [# or name]: %lu\n",
 120                     (unsigned long)pw->pw_gid);
 121                 fprintf(fp, "Change [month day year]: %s\n",
 122                     ttoa(pw->pw_change));
 123                 fprintf(fp, "Expire [month day year]: %s\n",
 124                     ttoa(pw->pw_expire));
 125                 fprintf(fp, "Class: %s\n", pw->pw_class);
 126                 fprintf(fp, "Home directory: %s\n", pw->pw_dir);
 127                 fprintf(fp, "Shell: %s\n",
 128                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 129         }
 130         /* Only admin can change "restricted" shells. */
 131 #if 0
 132         else if (ok_shell(pw->pw_shell))
 133                 /*
 134                  * Make shell a restricted field.  Ugly with a
 135                  * necklace, but there's not much else to do.
 136                  */
 137 #else
 138         else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) ||
 139             master_mode)
 140                 /*
 141                  * If change not restrict (table.c) and standard shell
 142                  *      OR if root, then allow editing of shell.
 143                  */
 144 #endif
 145                 fprintf(fp, "Shell: %s\n",
 146                     *pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
 147         else
 148                 list[E_SHELL].restricted = 1;
 149
 150         if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) {
 151                 warn(NULL);
 152                 fclose(fp);
 153                 return (-1);
 154         }
 155
 156         p = strsep(&bp, ",");
 157         p = strdup(p ? p : "");
 158         list[E_NAME].save = p;
 159         if (!list[E_NAME].restricted || master_mode)
 160                 fprintf(fp, "Full Name: %s\n", p);
 161
 162         p = strsep(&bp, ",");
 163         p = strdup(p ? p : "");
 164         list[E_LOCATE].save = p;
 165         if (!list[E_LOCATE].restricted || master_mode)
 166                 fprintf(fp, "Office Location: %s\n", p);
 167
 168         p = strsep(&bp, ",");
 169         p = strdup(p ? p : "");
 170         list[E_BPHONE].save = p;
 171         if (!list[E_BPHONE].restricted || master_mode)
 172                 fprintf(fp, "Office Phone: %s\n", p);
 173
 174         p = strsep(&bp, ",");
 175         p = strdup(p ? p : "");
 176         list[E_HPHONE].save = p;
 177         if (!list[E_HPHONE].restricted || master_mode)
 178                 fprintf(fp, "Home Phone: %s\n", p);
 179
 180         bp = strdup(bp ? bp : "");
 181         list[E_OTHER].save = bp;
 182         if (!list[E_OTHER].restricted || master_mode)
 183                 fprintf(fp, "Other information: %s\n", bp);
 184
 185         free(gecos);
 186
 187         fchown(fileno(fp), getuid(), getgid());
 188         fclose(fp);
 189         return (0);
 190 }
 191
 192 static struct passwd *
 193 verify(const char *tfn, struct passwd *pw)
 194 {
 195         struct passwd *npw;
 196         ENTRY *ep;
 197         char *buf, *p, *val;
 198         struct stat sb;
 199         FILE *fp;
 200         int line;
 201         size_t len;
 202
 203         if ((pw = pw_dup(pw)) == NULL)
 204                 return (NULL);
 205         if ((fp = fopen(tfn, "r")) == NULL ||
 206             fstat(fileno(fp), &sb) == -1) {
 207                 warn("%s", tfn);
 208                 free(pw);
 209                 return (NULL);
 210         }
 211         if (sb.st_size == 0) {
 212                 warnx("corrupted temporary file");
 213                 fclose(fp);
 214                 free(pw);
 215                 return (NULL);
 216         }
 217         val = NULL;
 218         for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) {
 219                 if (*buf == '\0' || *buf == '#')
 220                         continue;
 221                 while (len > 0 && isspace(buf[len - 1]))
 222                         --len;
 223                 for (ep = list;; ++ep) {
 224                         if (!ep->prompt) {
 225                                 warnx("%s: unrecognized field on line %d",
 226                                     tfn, line);
 227                                 goto bad;
 228                         }
 229                         if (ep->len > len)
 230                                 continue;
 231                         if (strncasecmp(buf, ep->prompt, ep->len) != 0)
 232                                 continue;
 233                         if (ep->restricted && !master_mode) {
 234                                 warnx("%s: you may not change the %s field",
 235                                     tfn, ep->prompt);
 236                                 goto bad;
 237                         }
 238                         for (p = buf; p < buf + len && *p != ':'; ++p)
 239                                 /* nothing */ ;
 240                         if (*p != ':') {
 241                                 warnx("%s: line %d corrupted", tfn, line);
 242                                 goto bad;
 243                         }
 244                         while (++p < buf + len && isspace(*p))
 245                                 /* nothing */ ;
 246                         free(val);
 247                         asprintf(&val, "%.*s", (int)(buf + len - p), p);
 248                         if (val == NULL)
 249                                 goto bad;
 250                         if (ep->except && strpbrk(val, ep->except)) {
 251                                 warnx("%s: invalid character in \"%s\" field '%s'",
 252                                     tfn, ep->prompt, val);
 253                                 goto bad;
 254                         }
 255                         if ((ep->func)(val, pw, ep))
 256                                 goto bad;
 257                         break;
 258                 }
 259         }
 260         free(val);
 261         fclose(fp);
 262
 263         /* Build the gecos field. */
 264         len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save,
 265             list[E_LOCATE].save, list[E_BPHONE].save,
 266             list[E_HPHONE].save, list[E_OTHER].save);
 267         if (p == NULL) {
 268                 warn("asprintf()");
 269                 free(pw);
 270                 return (NULL);
 271         }
 272         while (len > 0 && p[len - 1] == ',')
 273                 p[--len] = '\0';
 274         pw->pw_gecos = p;
 275         buf = pw_make(pw);
 276         free(pw);
 277         free(p);
 278         if (buf == NULL) {
 279                 warn("pw_make()");
 280                 return (NULL);
 281         }
 282         npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER);
 283         free(buf);
 284         return (npw);
 285 bad:
 286         free(pw);
 287         free(val);
 288         fclose(fp);
 289         return (NULL);
 290 }