pwd_mkdb.tproj/pw_scan.c

   1 /*      $OpenBSD: passwd.c,v 1.42 2003/06/26 16:34:42 deraadt Exp $     */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994, 1995
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 static const char rcsid[] = "$OpenBSD: passwd.c,v 1.42 2003/06/26 16:34:42 deraadt Exp $";
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40 #include <sys/wait.h>
  41
  42 #include <fcntl.h>
  43 #include <unistd.h>
  44 #include <stdlib.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <ctype.h>
  48 #include <pwd.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <paths.h>
  52 #include <signal.h>
  53 #include <limits.h>
  54
  55 #include "util.h"
  56
  57 int
  58 pw_scan(char *bp, struct passwd *pw, int *flags)
  59 {
  60         u_long id;
  61         int root;
  62         char *p, *sh, *p2;
  63
  64         if (flags != (int *)NULL)
  65                 *flags = 0;
  66
  67         if (!(p = strsep(&bp, ":")) || *p == '\0')      /* login */
  68                 goto fmt;
  69         pw->pw_name = p;
  70         root = !strcmp(pw->pw_name, "root");
  71
  72         if (!(pw->pw_passwd = strsep(&bp, ":")))        /* passwd */
  73                 goto fmt;
  74
  75         if (!(p = strsep(&bp, ":")))                    /* uid */
  76                 goto fmt;
  77         id = strtoul(p, &p2, 10);
  78         if (root && id) {
  79                 warnx("root uid should be 0");
  80                 return (0);
  81         }
  82         if (*p2 != '\0') {
  83                 warnx("illegal uid field");
  84                 return (0);
  85         }
  86 #ifndef __APPLE__
  87         /* Apple's UID_MAX is too small (sizeof signed) 3091256 */
  88         if (id > UID_MAX) {
  89                 /* errno is set to ERANGE by strtoul(3) */
  90                 warnx("uid greater than %u", UID_MAX-1);
  91                 return (0);
  92         }
  93 #endif
  94         pw->pw_uid = (uid_t)id;
  95         if ((*p == '\0') && (flags != (int *)NULL))
  96                 *flags |= _PASSWORD_NOUID;
  97
  98         if (!(p = strsep(&bp, ":")))                    /* gid */
  99                 goto fmt;
 100         id = strtoul(p, &p2, 10);
 101         if (*p2 != '\0') {
 102                 warnx("illegal gid field");
 103                 return (0);
 104         }
 105 #ifndef __APPLE__
 106         /* Apple's UID_MAX is too small (sizeof signed) 3091256 */
 107         if (id > UID_MAX) {
 108                 /* errno is set to ERANGE by strtoul(3) */
 109                 warnx("gid greater than %u", UID_MAX-1);
 110                 return (0);
 111         }
 112 #endif
 113         pw->pw_gid = (gid_t)id;
 114         if ((*p == '\0') && (flags != (int *)NULL))
 115                 *flags |= _PASSWORD_NOGID;
 116
 117         pw->pw_class = strsep(&bp, ":");                /* class */
 118         if (!(p = strsep(&bp, ":")))                    /* change */
 119                 goto fmt;
 120         pw->pw_change = atol(p);
 121         if ((*p == '\0') && (flags != (int *)NULL))
 122                 *flags |= _PASSWORD_NOCHG;
 123         if (!(p = strsep(&bp, ":")))                    /* expire */
 124                 goto fmt;
 125         pw->pw_expire = atol(p);
 126         if ((*p == '\0') && (flags != (int *)NULL))
 127                 *flags |= _PASSWORD_NOEXP;
 128         pw->pw_gecos = strsep(&bp, ":");                /* gecos */
 129         pw->pw_dir = strsep(&bp, ":");                  /* directory */
 130         if (!(pw->pw_shell = strsep(&bp, ":")))         /* shell */
 131                 goto fmt;
 132
 133         p = pw->pw_shell;
 134         if (root && *p) {                               /* empty == /bin/sh */
 135                 for (setusershell();;) {
 136                         if (!(sh = getusershell())) {
 137                                 warnx("warning, unknown root shell");
 138                                 break;
 139                         }
 140                         if (!strcmp(p, sh))
 141                                 break;
 142                 }
 143                 endusershell();
 144         }
 145
 146         if ((p = strsep(&bp, ":"))) {                   /* too many */
 147 fmt:            warnx("corrupted entry");
 148                 return (0);
 149         }
 150
 151         return (1);
 152 }