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. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)field.c  8.4 (Berkeley) 4/2/94
  37  * $FreeBSD: src/usr.bin/chpass/field.c,v 1.9 2004/01/18 21:46:39 charnier Exp $
  38  * $DragonFly: src/usr.bin/chpass/field.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43
  44 #include <ctype.h>
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <grp.h>
  48 #include <paths.h>
  49 #include <pwd.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 #include "chpass.h"
  54
  55 /* ARGSUSED */
  56 int
  57 p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
  58 {
  59         if (!*p) {
  60                 warnx("empty login field");
  61                 return (-1);
  62         }
  63         if (*p == '-') {
  64                 warnx("login names may not begin with a hyphen");
  65                 return (-1);
  66         }
  67         if (!(pw->pw_name = strdup(p))) {
  68                 warnx("can't save entry");
  69                 return (-1);
  70         }
  71         if (strchr(p, '.'))
  72                 warnx("\'.\' is dangerous in a login name");
  73         for (; *p; ++p)
  74                 if (isupper(*p)) {
  75                         warnx("upper-case letters are dangerous in a login name");
  76                         break;
  77                 }
  78         return (0);
  79 }
  80
  81 /* ARGSUSED */
  82 int
  83 p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
  84 {
  85         if (!(pw->pw_passwd = strdup(p))) {
  86                 warnx("can't save password entry");
  87                 return (-1);
  88         }
  89
  90         return (0);
  91 }
  92
  93 /* ARGSUSED */
  94 int
  95 p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
  96 {
  97         uid_t id;
  98         char *np;
  99
 100         if (!*p) {
 101                 warnx("empty uid field");
 102                 return (-1);
 103         }
 104         if (!isdigit(*p)) {
 105                 warnx("illegal uid");
 106                 return (-1);
 107         }
 108         errno = 0;
 109         id = strtoul(p, &np, 10);
 110         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 111                 warnx("illegal uid");
 112                 return (-1);
 113         }
 114         pw->pw_uid = id;
 115         return (0);
 116 }
 117
 118 /* ARGSUSED */
 119 int
 120 p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
 121 {
 122         struct group *gr;
 123         gid_t id;
 124         char *np;
 125
 126         if (!*p) {
 127                 warnx("empty gid field");
 128                 return (-1);
 129         }
 130         if (!isdigit(*p)) {
 131                 if (!(gr = getgrnam(p))) {
 132                         warnx("unknown group %s", p);
 133                         return (-1);
 134                 }
 135                 pw->pw_gid = gr->gr_gid;
 136                 return (0);
 137         }
 138         errno = 0;
 139         id = strtoul(p, &np, 10);
 140         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 141                 warnx("illegal gid");
 142                 return (-1);
 143         }
 144         pw->pw_gid = id;
 145         return (0);
 146 }
 147
 148 /* ARGSUSED */
 149 int
 150 p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
 151 {
 152         if (!(pw->pw_class = strdup(p))) {
 153                 warnx("can't save entry");
 154                 return (-1);
 155         }
 156
 157         return (0);
 158 }
 159
 160 /* ARGSUSED */
 161 int
 162 p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
 163 {
 164         if (!atot(p, &pw->pw_change))
 165                 return (0);
 166         warnx("illegal date for change field");
 167         return (-1);
 168 }
 169
 170 /* ARGSUSED */
 171 int
 172 p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
 173 {
 174         if (!atot(p, &pw->pw_expire))
 175                 return (0);
 176         warnx("illegal date for expire field");
 177         return (-1);
 178 }
 179
 180 /* ARGSUSED */
 181 int
 182 p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
 183 {
 184         if (!(ep->save = strdup(p))) {
 185                 warnx("can't save entry");
 186                 return (-1);
 187         }
 188         return (0);
 189 }
 190
 191 /* ARGSUSED */
 192 int
 193 p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
 194 {
 195         if (!*p) {
 196                 warnx("empty home directory field");
 197                 return (-1);
 198         }
 199         if (!(pw->pw_dir = strdup(p))) {
 200                 warnx("can't save entry");
 201                 return (-1);
 202         }
 203         return (0);
 204 }
 205
 206 /* ARGSUSED */
 207 int
 208 p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
 209 {
 210         struct stat sbuf;
 211
 212         if (!*p) {
 213                 pw->pw_shell = strdup(_PATH_BSHELL);
 214                 return (0);
 215         }
 216         /* only admin can change from or to "restricted" shells */
 217         if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 218                 warnx("%s: current shell non-standard", pw->pw_shell);
 219                 return (-1);
 220         }
 221         if (!ok_shell(p)) {
 222                 if (!master_mode) {
 223                         warnx("%s: non-standard shell", p);
 224                         return (-1);
 225                 }
 226                 pw->pw_shell = strdup(p);
 227         }
 228         else
 229                 pw->pw_shell = dup_shell(p);
 230         if (!pw->pw_shell) {
 231                 warnx("can't save entry");
 232                 return (-1);
 233         }
 234         if (stat(pw->pw_shell, &sbuf) < 0) {
 235                 if (errno == ENOENT)
 236                         warnx("WARNING: shell '%s' does not exist",
 237                             pw->pw_shell);
 238                 else
 239                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 240                 return (0);
 241         }
 242         if (!S_ISREG(sbuf.st_mode)) {
 243                 warnx("WARNING: shell '%s' is not a regular file",
 244                         pw->pw_shell);
 245                 return (0);
 246         }
 247         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 248                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 249                 return (0);
 250         }
 251         return (0);
 252 }