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pw_scan.c revision 1.12 
      1 /*	$NetBSD: pw_scan.c,v 1.12 2003/08/07 16:42:55 agc 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 HAVE_CONFIG_H
     33 #include "config.h"
     34 #include "compat_pwd.h"
     35 #else
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 __RCSID("$NetBSD: pw_scan.c,v 1.12 2003/08/07 16:42:55 agc Exp $");
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #if defined(_LIBC)
     42 #include "namespace.h"
     43 #endif
     44 #include <sys/types.h>
     45 
     46 #include <assert.h>
     47 #include <err.h>
     48 #include <limits.h>
     49 #include <pwd.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 
     55 #ifdef _LIBC
     56 #include "pw_private.h"
     57 #endif
     58 #endif /* !HAVE_CONFIG_H */
     59 
     60 int
     61 #ifdef _LIBC
     62 __pw_scan(bp, pw, flags)
     63 #else
     64 pw_scan(bp, pw, flags)
     65 #endif
     66 	char *bp;
     67 	struct passwd *pw;
     68 	int *flags;
     69 {
     70 	unsigned long id;
     71 	int root, inflags;
     72 	char *ep;
     73 	const char *p, *sh;
     74 
     75 	_DIAGASSERT(bp != NULL);
     76 	_DIAGASSERT(pw != NULL);
     77 
     78 	inflags = 0;
     79 	if (flags != (int *)NULL) {
     80 		inflags = *flags;
     81 		*flags = 0;
     82 	}
     83 
     84 	if (!(pw->pw_name = strsep(&bp, ":")))		/* login */
     85 		goto fmt;
     86 	root = !strcmp(pw->pw_name, "root");
     87 
     88 	if (!(pw->pw_passwd = strsep(&bp, ":")))	/* passwd */
     89 		goto fmt;
     90 
     91 	if (!(p = strsep(&bp, ":")))			/* uid */
     92 		goto fmt;
     93 	id = strtoul(p, &ep, 10);
     94 	if (root && id) {
     95 		if (!(inflags & _PASSWORD_NOWARN))
     96 			warnx("root uid should be 0");
     97 		return (0);
     98 	}
     99 	if (id > UID_MAX || *ep != '\0') {
    100 		if (!(inflags & _PASSWORD_NOWARN))
    101 			warnx("invalid uid '%s'", p);
    102 		return (0);
    103 	}
    104 	pw->pw_uid = (uid_t)id;
    105 	if ((*p == '\0') && (flags != (int *)NULL))
    106 		*flags |= _PASSWORD_NOUID;
    107 
    108 	if (!(p = strsep(&bp, ":")))			/* gid */
    109 		goto fmt;
    110 	id = strtoul(p, &ep, 10);
    111 	if (id > GID_MAX || *ep != '\0') {
    112 		if (!(inflags & _PASSWORD_NOWARN))
    113 			warnx("invalid gid '%s'", p);
    114 		return (0);
    115 	}
    116 	pw->pw_gid = (gid_t)id;
    117 	if ((*p == '\0') && (flags != (int *)NULL))
    118 		*flags |= _PASSWORD_NOGID;
    119 
    120 	if (inflags & _PASSWORD_OLDFMT) {
    121 		pw->pw_class = "";
    122 		pw->pw_change = 0;
    123 		pw->pw_expire = 0;
    124 		*flags |= (_PASSWORD_NOCHG | _PASSWORD_NOEXP);
    125 	} else {
    126 		pw->pw_class = strsep(&bp, ":");	/* class */
    127 		if (!(p = strsep(&bp, ":")))		/* change */
    128 			goto fmt;
    129 		pw->pw_change = atol(p);
    130 		if ((*p == '\0') && (flags != (int *)NULL))
    131 			*flags |= _PASSWORD_NOCHG;
    132 		if (!(p = strsep(&bp, ":")))		/* expire */
    133 			goto fmt;
    134 		pw->pw_expire = atol(p);
    135 		if ((*p == '\0') && (flags != (int *)NULL))
    136 			*flags |= _PASSWORD_NOEXP;
    137 	}
    138 	pw->pw_gecos = strsep(&bp, ":");		/* gecos */
    139 	pw->pw_dir = strsep(&bp, ":");			/* directory */
    140 	if (!(pw->pw_shell = strsep(&bp, ":")))		/* shell */
    141 		goto fmt;
    142 
    143 #if !HAVE_CONFIG_H
    144 	p = pw->pw_shell;
    145 	if (root && *p)					/* empty == /bin/sh */
    146 		for (setusershell();;) {
    147 			if (!(sh = getusershell())) {
    148 				if (!(inflags & _PASSWORD_NOWARN))
    149 					warnx("warning, unknown root shell");
    150 				break;
    151 			}
    152 			if (!strcmp(p, sh))
    153 				break;
    154 		}
    155 #endif
    156 
    157 	if ((p = strsep(&bp, ":")) != NULL) {			/* too many */
    158 fmt:
    159 		if (!(inflags & _PASSWORD_NOWARN))
    160 			warnx("corrupted entry");
    161 		return (0);
    162 	}
    163 
    164 	return (1);
    165 }
    166