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pw_scan.c revision 1.10 
      1 /*	$NetBSD: pw_scan.c,v 1.10 1999/09/20 04:39:04 lukem 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 __RCSID("$NetBSD: pw_scan.c,v 1.10 1999/09/20 04:39:04 lukem 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 
     59 int
     60 #ifdef _LIBC
     61 __pw_scan(bp, pw, flags)
     62 #else
     63 pw_scan(bp, pw, flags)
     64 #endif
     65 	char *bp;
     66 	struct passwd *pw;
     67 	int *flags;
     68 {
     69 	unsigned long id;
     70 	int root, inflags;
     71 	char *ep;
     72 	const char *p, *sh;
     73 
     74 	_DIAGASSERT(bp != NULL);
     75 	_DIAGASSERT(pw != NULL);
     76 
     77 	inflags = 0;
     78 	if (flags != (int *)NULL) {
     79 		inflags = *flags;
     80 		*flags = 0;
     81 	}
     82 
     83 	if (!(pw->pw_name = strsep(&bp, ":")))		/* login */
     84 		goto fmt;
     85 	root = !strcmp(pw->pw_name, "root");
     86 
     87 	if (!(pw->pw_passwd = strsep(&bp, ":")))	/* passwd */
     88 		goto fmt;
     89 
     90 	if (!(p = strsep(&bp, ":")))			/* uid */
     91 		goto fmt;
     92 	id = strtoul(p, &ep, 10);
     93 	if (root && id) {
     94 		if (!(inflags & _PASSWORD_NOWARN))
     95 			warnx("root uid should be 0");
     96 		return (0);
     97 	}
     98 	if (id > UID_MAX || *ep != '\0') {
     99 		if (!(inflags & _PASSWORD_NOWARN))
    100 			warnx("invalid uid '%s'", p);
    101 		return (0);
    102 	}
    103 	pw->pw_uid = (uid_t)id;
    104 	if ((*p == '\0') && (flags != (int *)NULL))
    105 		*flags |= _PASSWORD_NOUID;
    106 
    107 	if (!(p = strsep(&bp, ":")))			/* gid */
    108 		goto fmt;
    109 	id = strtoul(p, &ep, 10);
    110 	if (id > GID_MAX || *ep != '\0') {
    111 		if (!(inflags & _PASSWORD_NOWARN))
    112 			warnx("invalid gid '%s'", p);
    113 		return (0);
    114 	}
    115 	pw->pw_gid = (gid_t)id;
    116 	if ((*p == '\0') && (flags != (int *)NULL))
    117 		*flags |= _PASSWORD_NOGID;
    118 
    119 	if (inflags & _PASSWORD_OLDFMT) {
    120 		pw->pw_class = "";
    121 		pw->pw_change = 0;
    122 		pw->pw_expire = 0;
    123 		*flags |= (_PASSWORD_NOCHG | _PASSWORD_NOEXP);
    124 	} else {
    125 		pw->pw_class = strsep(&bp, ":");	/* class */
    126 		if (!(p = strsep(&bp, ":")))		/* change */
    127 			goto fmt;
    128 		pw->pw_change = atol(p);
    129 		if ((*p == '\0') && (flags != (int *)NULL))
    130 			*flags |= _PASSWORD_NOCHG;
    131 		if (!(p = strsep(&bp, ":")))		/* expire */
    132 			goto fmt;
    133 		pw->pw_expire = atol(p);
    134 		if ((*p == '\0') && (flags != (int *)NULL))
    135 			*flags |= _PASSWORD_NOEXP;
    136 	}
    137 	pw->pw_gecos = strsep(&bp, ":");		/* gecos */
    138 	pw->pw_dir = strsep(&bp, ":");			/* directory */
    139 	if (!(pw->pw_shell = strsep(&bp, ":")))		/* shell */
    140 		goto fmt;
    141 
    142 	p = pw->pw_shell;
    143 	if (root && *p)					/* empty == /bin/sh */
    144 		for (setusershell();;) {
    145 			if (!(sh = getusershell())) {
    146 				if (!(inflags & _PASSWORD_NOWARN))
    147 					warnx("warning, unknown root shell");
    148 				break;
    149 			}
    150 			if (!strcmp(p, sh))
    151 				break;
    152 		}
    153 
    154 	if ((p = strsep(&bp, ":")) != NULL) {			/* too many */
    155 fmt:
    156 		if (!(inflags & _PASSWORD_NOWARN))
    157 			warnx("corrupted entry");
    158 		return (0);
    159 	}
    160 
    161 	return (1);
    162 }
    163