chpass/field.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1988, 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[] = "@(#)field.c     8.4 (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 <grp.h>
  59 #include <paths.h>
  60 #include <pwd.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63
  64 #include "chpass.h"
  65
  66 /* ARGSUSED */
  67 int
  68 p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
  69 {
  70         if (!*p) {
  71                 warnx("empty login field");
  72                 return (-1);
  73         }
  74         if (*p == '-') {
  75                 warnx("login names may not begin with a hyphen");
  76                 return (-1);
  77         }
  78         if (!(pw->pw_name = strdup(p))) {
  79                 warnx("can't save entry");
  80                 return (-1);
  81         }
  82         if (strchr(p, '.'))
  83                 warnx("\'.\' is dangerous in a login name");
  84         for (; *p; ++p)
  85                 if (isupper(*p)) {
  86                         warnx("upper-case letters are dangerous in a login name");
  87                         break;
  88                 }
  89         return (0);
  90 }
  91
  92 /* ARGSUSED */
  93 int
  94 p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
  95 {
  96         if (!(pw->pw_passwd = strdup(p))) {
  97                 warnx("can't save password entry");
  98                 return (-1);
  99         }
 100
 101         return (0);
 102 }
 103
 104 /* ARGSUSED */
 105 int
 106 p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
 107 {
 108         uid_t id;
 109         char *np;
 110
 111         if (!*p) {
 112                 warnx("empty uid field");
 113                 return (-1);
 114         }
 115         if (!isdigit(*p)) {
 116                 warnx("illegal uid");
 117                 return (-1);
 118         }
 119         errno = 0;
 120         id = strtoul(p, &np, 10);
 121         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 122                 warnx("illegal uid");
 123                 return (-1);
 124         }
 125         pw->pw_uid = id;
 126         return (0);
 127 }
 128
 129 /* ARGSUSED */
 130 int
 131 p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
 132 {
 133         struct group *gr;
 134         gid_t id;
 135         char *np;
 136
 137         if (!*p) {
 138                 warnx("empty gid field");
 139                 return (-1);
 140         }
 141         if (!isdigit(*p)) {
 142                 if (!(gr = getgrnam(p))) {
 143                         warnx("unknown group %s", p);
 144                         return (-1);
 145                 }
 146                 pw->pw_gid = gr->gr_gid;
 147                 return (0);
 148         }
 149         errno = 0;
 150         id = strtoul(p, &np, 10);
 151         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 152                 warnx("illegal gid");
 153                 return (-1);
 154         }
 155         pw->pw_gid = id;
 156         return (0);
 157 }
 158
 159 /* ARGSUSED */
 160 int
 161 p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
 162 {
 163         if (!(pw->pw_class = strdup(p))) {
 164                 warnx("can't save entry");
 165                 return (-1);
 166         }
 167
 168         return (0);
 169 }
 170
 171 /* ARGSUSED */
 172 int
 173 p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
 174 {
 175         if (!atot(p, &pw->pw_change))
 176                 return (0);
 177         warnx("illegal date for change field");
 178         return (-1);
 179 }
 180
 181 /* ARGSUSED */
 182 int
 183 p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
 184 {
 185         if (!atot(p, &pw->pw_expire))
 186                 return (0);
 187         warnx("illegal date for expire field");
 188         return (-1);
 189 }
 190
 191 /* ARGSUSED */
 192 int
 193 p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
 194 {
 195         if (!(ep->save = strdup(p))) {
 196                 warnx("can't save entry");
 197                 return (-1);
 198         }
 199         return (0);
 200 }
 201
 202 /* ARGSUSED */
 203 int
 204 p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
 205 {
 206         if (!*p) {
 207                 warnx("empty home directory field");
 208                 return (-1);
 209         }
 210         if (!(pw->pw_dir = strdup(p))) {
 211                 warnx("can't save entry");
 212                 return (-1);
 213         }
 214         return (0);
 215 }
 216
 217 /* ARGSUSED */
 218 int
 219 p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
 220 {
 221         struct stat sbuf;
 222
 223         if (!*p) {
 224                 pw->pw_shell = strdup(_PATH_BSHELL);
 225                 return (0);
 226         }
 227         /* only admin can change from or to "restricted" shells */
 228         if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 229                 warnx("%s: current shell non-standard", pw->pw_shell);
 230                 return (-1);
 231         }
 232         if (!ok_shell(p)) {
 233                 if (!master_mode) {
 234                         warnx("%s: non-standard shell", p);
 235                         return (-1);
 236                 }
 237                 pw->pw_shell = strdup(p);
 238         }
 239         else
 240                 pw->pw_shell = dup_shell(p);
 241         if (!pw->pw_shell) {
 242                 warnx("can't save entry");
 243                 return (-1);
 244         }
 245         if (stat(pw->pw_shell, &sbuf) < 0) {
 246                 if (errno == ENOENT)
 247                         warnx("WARNING: shell '%s' does not exist",
 248                             pw->pw_shell);
 249                 else
 250                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 251                 return (0);
 252         }
 253         if (!S_ISREG(sbuf.st_mode)) {
 254                 warnx("WARNING: shell '%s' is not a regular file",
 255                         pw->pw_shell);
 256                 return (0);
 257         }
 258         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 259                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 260                 return (0);
 261         }
 262         return (0);
 263 }