usr.sbin/pwd_mkdb/pw_scan.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)pw_scan.c        8.3 (Berkeley) 4/2/94
  34  * $FreeBSD: src/usr.sbin/pwd_mkdb/pw_scan.c,v 1.14.2.1 2002/11/11 08:52:04 maxim Exp $
  35  * $DragonFly: src/usr.sbin/pwd_mkdb/pw_scan.c,v 1.3 2005/12/05 02:40:27 swildner Exp $
  36  */
  37
  38 /*
  39  * This module is used to "verify" password entries by chpass(1) and
  40  * pwd_mkdb(8).
  41  */
  42
  43 #include <sys/param.h>
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <pwd.h>
  49 #include <stdio.h>
  50 #include <string.h>
  51 #include <stdlib.h>
  52 #include <unistd.h>
  53
  54 #include "pw_scan.h"
  55
  56 /*
  57  * Some software assumes that IDs are short.  We should emit warnings
  58  * for id's which can not be stored in a short, but we are more liberal
  59  * by default, warning for IDs greater than USHRT_MAX.
  60  *
  61  * If pw_big_ids_warning is anything other than -1 on entry to pw_scan()
  62  * it will be set based on the existance of PW_SCAN_BIG_IDS in the
  63  * environment.
  64  */
  65 int     pw_big_ids_warning = -1;
  66
  67 int
  68 pw_scan(char *bp, struct passwd *pw)
  69 {
  70         uid_t id;
  71         int root;
  72         char *ep, *p, *sh;
  73
  74         if (pw_big_ids_warning == -1)
  75                 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0;
  76
  77         pw->pw_fields = 0;
  78         if (!(pw->pw_name = strsep(&bp, ":")))          /* login */
  79                 goto fmt;
  80         root = !strcmp(pw->pw_name, "root");
  81         if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0'))
  82                 pw->pw_fields |= _PWF_NAME;
  83
  84         if (!(pw->pw_passwd = strsep(&bp, ":")))        /* passwd */
  85                 goto fmt;
  86         if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD;
  87
  88         if (!(p = strsep(&bp, ":")))                    /* uid */
  89                 goto fmt;
  90         if (p[0])
  91                 pw->pw_fields |= _PWF_UID;
  92         else {
  93                 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
  94                         warnx("no uid for user %s", pw->pw_name);
  95                         return (0);
  96                 }
  97         }
  98         id = strtoul(p, &ep, 10);
  99         if (errno == ERANGE) {
 100                 warnx("%s > max uid value (%lu)", p, ULONG_MAX);
 101                 return (0);
 102         }
 103         if (*ep != '\0') {
 104                 warnx("%s uid is incorrect", p);
 105                 return (0);
 106         }
 107         if (root && id) {
 108                 warnx("root uid should be 0");
 109                 return (0);
 110         }
 111         if (pw_big_ids_warning && id > USHRT_MAX) {
 112                 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX);
 113                 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */
 114         }
 115         pw->pw_uid = id;
 116
 117         if (!(p = strsep(&bp, ":")))                    /* gid */
 118                 goto fmt;
 119         if(p[0])
 120                 pw->pw_fields |= _PWF_GID;
 121         else {
 122                 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
 123                         warnx("no gid for user %s", pw->pw_name);
 124                         return (0);
 125                 }
 126         }
 127         id = strtoul(p, &ep, 10);
 128         if (errno == ERANGE) {
 129                 warnx("%s > max gid value (%lu)", p, ULONG_MAX);
 130                 return (0);
 131         }
 132         if (*ep != '\0') {
 133                 warnx("%s gid is incorrect", p);
 134                 return (0);
 135         }
 136         if (pw_big_ids_warning && id > USHRT_MAX) {
 137                 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX);
 138                 /* return (0); This should not be fatal! */
 139         }
 140         pw->pw_gid = id;
 141
 142         pw->pw_class = strsep(&bp, ":");                /* class */
 143         if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS;
 144
 145         if (!(p = strsep(&bp, ":")))                    /* change */
 146                 goto fmt;
 147         if(p[0]) pw->pw_fields |= _PWF_CHANGE;
 148         pw->pw_change = atol(p);
 149
 150         if (!(p = strsep(&bp, ":")))                    /* expire */
 151                 goto fmt;
 152         if(p[0]) pw->pw_fields |= _PWF_EXPIRE;
 153         pw->pw_expire = atol(p);
 154
 155         if (!(pw->pw_gecos = strsep(&bp, ":")))         /* gecos */
 156                 goto fmt;
 157         if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS;
 158
 159         if (!(pw->pw_dir = strsep(&bp, ":")))                   /* directory */
 160                 goto fmt;
 161         if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR;
 162
 163         if (!(pw->pw_shell = strsep(&bp, ":")))         /* shell */
 164                 goto fmt;
 165
 166         p = pw->pw_shell;
 167         if (root && *p)                                 /* empty == /bin/sh */
 168                 for (setusershell();;) {
 169                         if (!(sh = getusershell())) {
 170                                 warnx("warning, unknown root shell");
 171                                 break;
 172                         }
 173                         if (!strcmp(p, sh))
 174                                 break;
 175                 }
 176         if(p[0]) pw->pw_fields |= _PWF_SHELL;
 177
 178         if ((p = strsep(&bp, ":"))) {                   /* too many */
 179 fmt:            warnx("corrupted entry");
 180                 return (0);
 181         }
 182         return (1);
 183 }