[openssh.git] / groupaccess.c

/*
 * 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;

/*
 * 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 = xmalloc(ngroups * sizeof(*groups_bygid));
	groups_byname = xmalloc(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
63b68889	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
	27	#include "groupaccess.h"
63b68889	28	#include "xmalloc.h"
63b68889	29	#include "match.h"
42f11eb2	30	#include "log.h"
63b68889	31
63b68889	32	static int ngroups;
13dff404	33	static char **groups_byname;
63b68889	34
255cabd9	35	/*
	36	* Initialize group access list for user with primary (base) and
	37	* supplementary groups. Return the number of groups in the list.
	38	*/
63b68889	39	int
	40	ga_init(const char *user, gid_t base)
	41	{
13dff404	42	gid_t *groups_bygid;
63b68889	43	int i, j;
	44	struct group *gr;
	45
	46	if (ngroups > 0)
	47	ga_free();
	48
13dff404	49	ngroups = NGROUPS_MAX;
	50	#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
	51	ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
	52	#endif
	53
	54	groups_bygid = xmalloc(ngroups * sizeof(*groups_bygid));
	55	groups_byname = xmalloc(ngroups * sizeof(*groups_byname));
	56
63b68889	57	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
bbe88b6d	58	logit("getgrouplist: groups list too small");
63b68889	59	for (i = 0, j = 0; i < ngroups; i++)
	60	if ((gr = getgrgid(groups_bygid[i])) != NULL)
	61	groups_byname[j++] = xstrdup(gr->gr_name);
13dff404	62	xfree(groups_bygid);
63b68889	63	return (ngroups = j);
	64	}
	65
255cabd9	66	/*
	67	* Return 1 if one of user's groups is contained in groups.
	68	* Return 0 otherwise. Use match_pattern() for string comparison.
	69	*/
63b68889	70	int
	71	ga_match(char * const *groups, int n)
	72	{
	73	int i, j;
	74
	75	for (i = 0; i < ngroups; i++)
	76	for (j = 0; j < n; j++)
	77	if (match_pattern(groups_byname[i], groups[j]))
	78	return 1;
	79	return 0;
	80	}
	81
255cabd9	82	/*
	83	* Free memory allocated for group access list.
	84	*/
63b68889	85	void
	86	ga_free(void)
	87	{
	88	int i;
	89
	90	if (ngroups > 0) {
	91	for (i = 0; i < ngroups; i++)
	92	xfree(groups_byname[i]);
	93	ngroups = 0;
13dff404	94	xfree(groups_byname);
63b68889	95	}
63b68889	96	}