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
  41 #if 0
  42 #ifndef lint
  43 static char sccsid[] = "@(#)field.c     8.4 (Berkeley) 4/2/94";
  44 #endif /* not lint */
  45 #endif
  46
  47 #include <sys/cdefs.h>
  48 __FBSDID("$FreeBSD$");
  49
  50 #include <sys/param.h>
  51 #include <sys/stat.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <grp.h>
  57 #include <paths.h>
  58 #include <pwd.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61
  62 #include "chpass.h"
  63
  64 /* ARGSUSED */
  65 int
  66 p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
  67 {
  68         if (!*p) {
  69                 warnx("empty login field");
  70                 return (-1);
  71         }
  72         if (*p == '-') {
  73                 warnx("login names may not begin with a hyphen");
  74                 return (-1);
  75         }
  76         if (!(pw->pw_name = strdup(p))) {
  77                 warnx("can't save entry");
  78                 return (-1);
  79         }
  80         if (strchr(p, '.'))
  81                 warnx("\'.\' is dangerous in a login name");
  82         for (; *p; ++p)
  83                 if (isupper(*p)) {
  84                         warnx("upper-case letters are dangerous in a login name");
  85                         break;
  86                 }
  87         return (0);
  88 }
  89
  90 /* ARGSUSED */
  91 int
  92 p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
  93 {
  94         if (!(pw->pw_passwd = strdup(p))) {
  95                 warnx("can't save password entry");
  96                 return (-1);
  97         }
  98
  99         return (0);
 100 }
 101
 102 /* ARGSUSED */
 103 int
 104 p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
 105 {
 106         uid_t id;
 107         char *np;
 108
 109         if (!*p) {
 110                 warnx("empty uid field");
 111                 return (-1);
 112         }
 113         if (!isdigit(*p)) {
 114                 warnx("illegal uid");
 115                 return (-1);
 116         }
 117         errno = 0;
 118         id = strtoul(p, &np, 10);
 119         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 120                 warnx("illegal uid");
 121                 return (-1);
 122         }
 123         pw->pw_uid = id;
 124         return (0);
 125 }
 126
 127 /* ARGSUSED */
 128 int
 129 p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
 130 {
 131         struct group *gr;
 132         gid_t id;
 133         char *np;
 134
 135         if (!*p) {
 136                 warnx("empty gid field");
 137                 return (-1);
 138         }
 139         if (!isdigit(*p)) {
 140                 if (!(gr = getgrnam(p))) {
 141                         warnx("unknown group %s", p);
 142                         return (-1);
 143                 }
 144                 pw->pw_gid = gr->gr_gid;
 145                 return (0);
 146         }
 147         errno = 0;
 148         id = strtoul(p, &np, 10);
 149         if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
 150                 warnx("illegal gid");
 151                 return (-1);
 152         }
 153         pw->pw_gid = id;
 154         return (0);
 155 }
 156
 157 /* ARGSUSED */
 158 int
 159 p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
 160 {
 161         if (!(pw->pw_class = strdup(p))) {
 162                 warnx("can't save entry");
 163                 return (-1);
 164         }
 165
 166         return (0);
 167 }
 168
 169 /* ARGSUSED */
 170 int
 171 p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
 172 {
 173         if (!atot(p, &pw->pw_change))
 174                 return (0);
 175         warnx("illegal date for change field");
 176         return (-1);
 177 }
 178
 179 /* ARGSUSED */
 180 int
 181 p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
 182 {
 183         if (!atot(p, &pw->pw_expire))
 184                 return (0);
 185         warnx("illegal date for expire field");
 186         return (-1);
 187 }
 188
 189 /* ARGSUSED */
 190 int
 191 p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
 192 {
 193         if (!(ep->save = strdup(p))) {
 194                 warnx("can't save entry");
 195                 return (-1);
 196         }
 197         return (0);
 198 }
 199
 200 /* ARGSUSED */
 201 int
 202 p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
 203 {
 204         if (!*p) {
 205                 warnx("empty home directory field");
 206                 return (-1);
 207         }
 208         if (!(pw->pw_dir = strdup(p))) {
 209                 warnx("can't save entry");
 210                 return (-1);
 211         }
 212         return (0);
 213 }
 214
 215 /* ARGSUSED */
 216 int
 217 p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
 218 {
 219         struct stat sbuf;
 220
 221         if (!*p) {
 222                 pw->pw_shell = strdup(_PATH_BSHELL);
 223                 return (0);
 224         }
 225         /* only admin can change from or to "restricted" shells */
 226         if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 227                 warnx("%s: current shell non-standard", pw->pw_shell);
 228                 return (-1);
 229         }
 230         if (!ok_shell(p)) {
 231                 if (!master_mode) {
 232                         warnx("%s: non-standard shell", p);
 233                         return (-1);
 234                 }
 235                 pw->pw_shell = strdup(p);
 236         }
 237         else
 238                 pw->pw_shell = dup_shell(p);
 239         if (!pw->pw_shell) {
 240                 warnx("can't save entry");
 241                 return (-1);
 242         }
 243         if (stat(pw->pw_shell, &sbuf) < 0) {
 244                 if (errno == ENOENT)
 245                         warnx("WARNING: shell '%s' does not exist",
 246                             pw->pw_shell);
 247                 else
 248                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 249                 return (0);
 250         }
 251         if (!S_ISREG(sbuf.st_mode)) {
 252                 warnx("WARNING: shell '%s' is not a regular file",
 253                         pw->pw_shell);
 254                 return (0);
 255         }
 256         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 257                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 258                 return (0);
 259         }
 260         return (0);
 261 }