[openssh.git] / groupaccess.c

/* $OpenBSD: groupaccess.c,v 1.9 2006/07/02 22:45:59 stevesk 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 <sys/types.h>

#include <grp.h>

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

static int ngroups;
static char **groups_byname;

/*
 * 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;
	int i, j;
	struct group *gr;

	if (ngroups > 0)
		ga_free();

	ngroups = NGROUPS_MAX;
#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
	ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
#endif

	groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid));
	groups_byname = xcalloc(ngroups, sizeof(*groups_byname));

	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
		logit("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);
	xfree(groups_bygid);
	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;
		xfree(groups_byname);
	}
}
Commit	Line	Data
16fbe330	1	/* $OpenBSD: groupaccess.c,v 1.9 2006/07/02 22:45:59 stevesk Exp $ */
63b68889	2	/*
	3	* Copyright (c) 2001 Kevin Steves. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "includes.h"
	27
16fbe330	28	#include <sys/types.h>
	29
	30	#include <grp.h>
	31
63b68889	32	#include "groupaccess.h"
63b68889	33	#include "xmalloc.h"
63b68889	34	#include "match.h"
42f11eb2	35	#include "log.h"
63b68889	36
63b68889	37	static int ngroups;
13dff404	38	static char **groups_byname;
63b68889	39
255cabd9	40	/*
	41	* Initialize group access list for user with primary (base) and
	42	* supplementary groups. Return the number of groups in the list.
	43	*/
63b68889	44	int
	45	ga_init(const char *user, gid_t base)
	46	{
13dff404	47	gid_t *groups_bygid;
63b68889	48	int i, j;
	49	struct group *gr;
	50
	51	if (ngroups > 0)
	52	ga_free();
	53
13dff404	54	ngroups = NGROUPS_MAX;
	55	#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
	56	ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
	57	#endif
	58
01d35895	59	groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid));
01d35895	60	groups_byname = xcalloc(ngroups, sizeof(*groups_byname));
13dff404	61
63b68889	62	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
bbe88b6d	63	logit("getgrouplist: groups list too small");
63b68889	64	for (i = 0, j = 0; i < ngroups; i++)
	65	if ((gr = getgrgid(groups_bygid[i])) != NULL)
	66	groups_byname[j++] = xstrdup(gr->gr_name);
13dff404	67	xfree(groups_bygid);
63b68889	68	return (ngroups = j);
	69	}
	70
255cabd9	71	/*
	72	* Return 1 if one of user's groups is contained in groups.
	73	* Return 0 otherwise. Use match_pattern() for string comparison.
	74	*/
63b68889	75	int
	76	ga_match(char * const *groups, int n)
	77	{
	78	int i, j;
	79
	80	for (i = 0; i < ngroups; i++)
	81	for (j = 0; j < n; j++)
	82	if (match_pattern(groups_byname[i], groups[j]))
	83	return 1;
	84	return 0;
	85	}
	86
255cabd9	87	/*
	88	* Free memory allocated for group access list.
	89	*/
63b68889	90	void
	91	ga_free(void)
	92	{
	93	int i;
	94
	95	if (ngroups > 0) {
	96	for (i = 0; i < ngroups; i++)
	97	xfree(groups_byname[i]);
	98	ngroups = 0;
13dff404	99	xfree(groups_byname);
63b68889	100	}
63b68889	101	}