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      1 /*
      2  * Copyright (c) 2001 Kevin Steves.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "includes.h"
     26 RCSID("$OpenBSD: groupaccess.c,v 1.5 2002/03/04 17:27:39 stevesk Exp $");
     27 
     28 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     29 
     30 #include "groupaccess.h"
     31 #include "xmalloc.h"
     32 #include "match.h"
     33 #include "log.h"
     34 
     35 static int ngroups;
     36 static char *groups_byname[NGROUPS_UMAX + 1];	/* +1 for base/primary group */
     37 
     38 /*
     39  * Initialize group access list for user with primary (base) and
     40  * supplementary groups.  Return the number of groups in the list.
     41  */
     42 int
     43 ga_init(const char *user, gid_t base)
     44 {
     45 	gid_t groups_bygid[NGROUPS_UMAX + 1];
     46 	int i, j;
     47 	struct group *gr;
     48 
     49 	if (ngroups > 0)
     50 		ga_free();
     51 
     52 	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
     53 	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
     54 		log("getgrouplist: groups list too small");
     55 	for (i = 0, j = 0; i < ngroups; i++)
     56 		if ((gr = getgrgid(groups_bygid[i])) != NULL)
     57 			groups_byname[j++] = xstrdup(gr->gr_name);
     58 	return (ngroups = j);
     59 }
     60 
     61 /*
     62  * Return 1 if one of user's groups is contained in groups.
     63  * Return 0 otherwise.  Use match_pattern() for string comparison.
     64  */
     65 int
     66 ga_match(char * const *groups, int n)
     67 {
     68 	int i, j;
     69 
     70 	for (i = 0; i < ngroups; i++)
     71 		for (j = 0; j < n; j++)
     72 			if (match_pattern(groups_byname[i], groups[j]))
     73 				return 1;
     74 	return 0;
     75 }
     76 
     77 /*
     78  * Free memory allocated for group access list.
     79  */
     80 void
     81 ga_free(void)
     82 {
     83 	int i;
     84 
     85 	if (ngroups > 0) {
     86 		for (i = 0; i < ngroups; i++)
     87 			xfree(groups_byname[i]);
     88 		ngroups = 0;
     89 	}
     90 }
     91