[gssapi-openssh.git] / openssh / groupaccess.c

/*	$OpenBSD: groupaccess.c,v 1.4 2001/06/26 17:27:23 markus Exp $	*/

/*
 * Copyright (c) 2001 Kevin Steves.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

#include "groupaccess.h"
#include "xmalloc.h"
#include "match.h"
#include "log.h"

static int ngroups;
static char *groups_byname[NGROUPS_MAX + 1];	/* +1 for base/primary group */

/*
 * Initialize group access list for user with primary (base) and
 * supplementary groups.  Return the number of groups in the list.
 */
int
ga_init(const char *user, gid_t base)
{
	gid_t groups_bygid[NGROUPS_MAX + 1];
	int i, j;
	struct group *gr;

	if (ngroups > 0)
		ga_free();

	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
		log("getgrouplist: groups list too small");
	for (i = 0, j = 0; i < ngroups; i++)
		if ((gr = getgrgid(groups_bygid[i])) != NULL)
			groups_byname[j++] = xstrdup(gr->gr_name);
	return (ngroups = j);
}

/*
 * Return 1 if one of user's groups is contained in groups.
 * Return 0 otherwise.  Use match_pattern() for string comparison.
 */
int
ga_match(char * const *groups, int n)
{
	int i, j;

	for (i = 0; i < ngroups; i++)
		for (j = 0; j < n; j++)
			if (match_pattern(groups_byname[i], groups[j]))
				return 1;
	return 0;
}

/*
 * Free memory allocated for group access list.
 */
void
ga_free(void)
{
	int i;

	if (ngroups > 0) {
		for (i = 0; i < ngroups; i++)
			xfree(groups_byname[i]);
		ngroups = 0;
	}
}
Commit	Line	Data
3c0ef626	1	/* $OpenBSD: groupaccess.c,v 1.4 2001/06/26 17:27:23 markus Exp $ */
	2
	3	/*
	4	* Copyright (c) 2001 Kevin Steves. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
	27	#include "includes.h"
	28
	29	#include "groupaccess.h"
	30	#include "xmalloc.h"
	31	#include "match.h"
	32	#include "log.h"
	33
	34	static int ngroups;
	35	static char groups_byname[NGROUPS_MAX + 1]; / +1 for base/primary group */
	36
	37	/*
	38	* Initialize group access list for user with primary (base) and
	39	* supplementary groups. Return the number of groups in the list.
	40	*/
	41	int
	42	ga_init(const char *user, gid_t base)
	43	{
	44	gid_t groups_bygid[NGROUPS_MAX + 1];
	45	int i, j;
	46	struct group *gr;
	47
	48	if (ngroups > 0)
	49	ga_free();
	50
	51	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
	52	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
	53	log("getgrouplist: groups list too small");
	54	for (i = 0, j = 0; i < ngroups; i++)
	55	if ((gr = getgrgid(groups_bygid[i])) != NULL)
	56	groups_byname[j++] = xstrdup(gr->gr_name);
	57	return (ngroups = j);
	58	}
	59
	60	/*
	61	* Return 1 if one of user's groups is contained in groups.
	62	* Return 0 otherwise. Use match_pattern() for string comparison.
	63	*/
	64	int
65	ga_match(char * const *groups, int n)
66	{
67	int i, j;
68
69	for (i = 0; i < ngroups; i++)
70	for (j = 0; j < n; j++)
71	if (match_pattern(groups_byname[i], groups[j]))
72	return 1;
73	return 0;
74	}
75
76	/*
77	* Free memory allocated for group access list.
78	*/
79	void
80	ga_free(void)
81	{
82	int i;
83
84	if (ngroups > 0) {
85	for (i = 0; i < ngroups; i++)
86	xfree(groups_byname[i]);
87	ngroups = 0;
88	}
89	}