usr.bin/chpass/field.c

   1 /*
   2  * Copyright (c) 1988, 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  * @(#)field.c  8.4 (Berkeley) 4/2/94
  41  * $FreeBSD: src/usr.bin/chpass/field.c,v 1.9 2004/01/18 21:46:39 charnier Exp $
  42  * $DragonFly: src/usr.bin/chpass/field.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 <grp.h>
  52 #include <paths.h>
  53 #include <pwd.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56
  57 #include "chpass.h"
  58
  59 /* ARGSUSED */
  60 int
  61 p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
  62 {
  63         if (!*p) {
  64                 warnx("empty login field");
  65                 return (-1);
  66         }
  67         if (*p == '-') {
  68                 warnx("login names may not begin with a hyphen");
  69                 return (-1);
  70         }
  71         if (!(pw->pw_name = strdup(p))) {
  72                 warnx("can't save entry");
  73                 return (-1);
  74         }
  75         if (strchr(p, '.'))
  76                 warnx("\'.\' is dangerous in a login name");
  77         for (; *p; ++p)
  78                 if (isupper(*p)) {
  79                         warnx("upper-case letters are dangerous in a login name");
  80                         break;
  81                 }
  82         return (0);
  83 }
  84
  85 /* ARGSUSED */
  86 int
  87 p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
  88 {
  89         if (!(pw->pw_passwd = strdup(p))) {
  90                 warnx("can't save password entry");
  91                 return (-1);
  92         }
  93
  94         return (0);
  95 }
  96
  97 /* ARGSUSED */
  98 int
  99 p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
 100 {
 101         uid_t id;
 102         char *np;
 103
 104         if (!*p) {
 105                 warnx("empty uid field");
 106                 return (-1);
 107         }
 108         if (!isdigit(*p)) {
 109                 warnx("illegal uid");
 110                 return (-1);
 111         }
 112         errno = 0;
 113         id = strtoul(p, &np, 10);
 114         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 115                 warnx("illegal uid");
 116                 return (-1);
 117         }
 118         pw->pw_uid = id;
 119         return (0);
 120 }
 121
 122 /* ARGSUSED */
 123 int
 124 p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
 125 {
 126         struct group *gr;
 127         gid_t id;
 128         char *np;
 129
 130         if (!*p) {
 131                 warnx("empty gid field");
 132                 return (-1);
 133         }
 134         if (!isdigit(*p)) {
 135                 if (!(gr = getgrnam(p))) {
 136                         warnx("unknown group %s", p);
 137                         return (-1);
 138                 }
 139                 pw->pw_gid = gr->gr_gid;
 140                 return (0);
 141         }
 142         errno = 0;
 143         id = strtoul(p, &np, 10);
 144         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 145                 warnx("illegal gid");
 146                 return (-1);
 147         }
 148         pw->pw_gid = id;
 149         return (0);
 150 }
 151
 152 /* ARGSUSED */
 153 int
 154 p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
 155 {
 156         if (!(pw->pw_class = strdup(p))) {
 157                 warnx("can't save entry");
 158                 return (-1);
 159         }
 160
 161         return (0);
 162 }
 163
 164 /* ARGSUSED */
 165 int
 166 p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
 167 {
 168         if (!atot(p, &pw->pw_change))
 169                 return (0);
 170         warnx("illegal date for change field");
 171         return (-1);
 172 }
 173
 174 /* ARGSUSED */
 175 int
 176 p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
 177 {
 178         if (!atot(p, &pw->pw_expire))
 179                 return (0);
 180         warnx("illegal date for expire field");
 181         return (-1);
 182 }
 183
 184 /* ARGSUSED */
 185 int
 186 p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
 187 {
 188         if (!(ep->save = strdup(p))) {
 189                 warnx("can't save entry");
 190                 return (-1);
 191         }
 192         return (0);
 193 }
 194
 195 /* ARGSUSED */
 196 int
 197 p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
 198 {
 199         if (!*p) {
 200                 warnx("empty home directory field");
 201                 return (-1);
 202         }
 203         if (!(pw->pw_dir = strdup(p))) {
 204                 warnx("can't save entry");
 205                 return (-1);
 206         }
 207         return (0);
 208 }
 209
 210 /* ARGSUSED */
 211 int
 212 p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
 213 {
 214         struct stat sbuf;
 215
 216         if (!*p) {
 217                 pw->pw_shell = strdup(_PATH_BSHELL);
 218                 return (0);
 219         }
 220         /* only admin can change from or to "restricted" shells */
 221         if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 222                 warnx("%s: current shell non-standard", pw->pw_shell);
 223                 return (-1);
 224         }
 225         if (!ok_shell(p)) {
 226                 if (!master_mode) {
 227                         warnx("%s: non-standard shell", p);
 228                         return (-1);
 229                 }
 230                 pw->pw_shell = strdup(p);
 231         }
 232         else
 233                 pw->pw_shell = dup_shell(p);
 234         if (!pw->pw_shell) {
 235                 warnx("can't save entry");
 236                 return (-1);
 237         }
 238         if (stat(pw->pw_shell, &sbuf) < 0) {
 239                 if (errno == ENOENT)
 240                         warnx("WARNING: shell '%s' does not exist",
 241                             pw->pw_shell);
 242                 else
 243                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 244                 return (0);
 245         }
 246         if (!S_ISREG(sbuf.st_mode)) {
 247                 warnx("WARNING: shell '%s' is not a regular file",
 248                         pw->pw_shell);
 249                 return (0);
 250         }
 251         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 252                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 253                 return (0);
 254         }
 255         return (0);
 256 }