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 1.2 2003/06/17 04:30:02 dillon 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(bp, pw)
  69         char *bp;
  70         struct passwd *pw;
  71 {
  72         uid_t id;
  73         int root;
  74         char *ep, *p, *sh;
  75
  76         if (pw_big_ids_warning == -1)
  77                 pw_big_ids_warning = getenv("PW_SCAN_BIG_IDS") == NULL ? 1 : 0;
  78
  79         pw->pw_fields = 0;
  80         if (!(pw->pw_name = strsep(&bp, ":")))          /* login */
  81                 goto fmt;
  82         root = !strcmp(pw->pw_name, "root");
  83         if(pw->pw_name[0] && (pw->pw_name[0] != '+' || pw->pw_name[1] == '\0'))
  84                 pw->pw_fields |= _PWF_NAME;
  85
  86         if (!(pw->pw_passwd = strsep(&bp, ":")))        /* passwd */
  87                 goto fmt;
  88         if(pw->pw_passwd[0]) pw->pw_fields |= _PWF_PASSWD;
  89
  90         if (!(p = strsep(&bp, ":")))                    /* uid */
  91                 goto fmt;
  92         if (p[0])
  93                 pw->pw_fields |= _PWF_UID;
  94         else {
  95                 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
  96                         warnx("no uid for user %s", pw->pw_name);
  97                         return (0);
  98                 }
  99         }
 100         id = strtoul(p, &ep, 10);
 101         if (errno == ERANGE) {
 102                 warnx("%s > max uid value (%lu)", p, ULONG_MAX);
 103                 return (0);
 104         }
 105         if (*ep != '\0') {
 106                 warnx("%s uid is incorrect", p);
 107                 return (0);
 108         }
 109         if (root && id) {
 110                 warnx("root uid should be 0");
 111                 return (0);
 112         }
 113         if (pw_big_ids_warning && id > USHRT_MAX) {
 114                 warnx("%s > recommended max uid value (%u)", p, USHRT_MAX);
 115                 /*return (0);*/ /* THIS SHOULD NOT BE FATAL! */
 116         }
 117         pw->pw_uid = id;
 118
 119         if (!(p = strsep(&bp, ":")))                    /* gid */
 120                 goto fmt;
 121         if(p[0])
 122                 pw->pw_fields |= _PWF_GID;
 123         else {
 124                 if (pw->pw_name[0] != '+' && pw->pw_name[0] != '-') {
 125                         warnx("no gid for user %s", pw->pw_name);
 126                         return (0);
 127                 }
 128         }
 129         id = strtoul(p, &ep, 10);
 130         if (errno == ERANGE) {
 131                 warnx("%s > max gid value (%lu)", p, ULONG_MAX);
 132                 return (0);
 133         }
 134         if (*ep != '\0') {
 135                 warnx("%s gid is incorrect", p);
 136                 return (0);
 137         }
 138         if (pw_big_ids_warning && id > USHRT_MAX) {
 139                 warnx("%s > recommended max gid value (%u)", p, USHRT_MAX);
 140                 /* return (0); This should not be fatal! */
 141         }
 142         pw->pw_gid = id;
 143
 144         pw->pw_class = strsep(&bp, ":");                /* class */
 145         if(pw->pw_class[0]) pw->pw_fields |= _PWF_CLASS;
 146
 147         if (!(p = strsep(&bp, ":")))                    /* change */
 148                 goto fmt;
 149         if(p[0]) pw->pw_fields |= _PWF_CHANGE;
 150         pw->pw_change = atol(p);
 151
 152         if (!(p = strsep(&bp, ":")))                    /* expire */
 153                 goto fmt;
 154         if(p[0]) pw->pw_fields |= _PWF_EXPIRE;
 155         pw->pw_expire = atol(p);
 156
 157         if (!(pw->pw_gecos = strsep(&bp, ":")))         /* gecos */
 158                 goto fmt;
 159         if(pw->pw_gecos[0]) pw->pw_fields |= _PWF_GECOS;
 160
 161         if (!(pw->pw_dir = strsep(&bp, ":")))                   /* directory */
 162                 goto fmt;
 163         if(pw->pw_dir[0]) pw->pw_fields |= _PWF_DIR;
 164
 165         if (!(pw->pw_shell = strsep(&bp, ":")))         /* shell */
 166                 goto fmt;
 167
 168         p = pw->pw_shell;
 169         if (root && *p)                                 /* empty == /bin/sh */
 170                 for (setusershell();;) {
 171                         if (!(sh = getusershell())) {
 172                                 warnx("warning, unknown root shell");
 173                                 break;
 174                         }
 175                         if (!strcmp(p, sh))
 176                                 break;
 177                 }
 178         if(p[0]) pw->pw_fields |= _PWF_SHELL;
 179
 180         if ((p = strsep(&bp, ":"))) {                   /* too many */
 181 fmt:            warnx("corrupted entry");
 182                 return (0);
 183         }
 184         return (1);
 185 }