[openssh.git] / groupaccess.c

/* $OpenBSD: groupaccess.c,v 1.13 2008/07/04 03:44:59 djm 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 <sys/param.h>

#include <grp.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>

#include "xmalloc.h"
#include "groupaccess.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;
}

/*
 * Return 1 if one of user's groups matches group_pattern list.
 * Return 0 on negated or no match.
 */
int
ga_match_pattern_list(const char *group_pattern)
{
	int i, found = 0;
	size_t len = strlen(group_pattern);

	for (i = 0; i < ngroups; i++) {
		switch (match_pattern_list(groups_byname[i],
		    group_pattern, len, 0)) {
		case -1:
			return 0;	/* Negated match wins */
		case 0:
			continue;
		case 1:
			found = 1;
		}
	}
	return found;
}

/*
 * 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
cece208b	1	/* $OpenBSD: groupaccess.c,v 1.13 2008/07/04 03:44:59 djm 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>
536c14e8	29	#include <sys/param.h>
16fbe330	30
16fbe330	31	#include <grp.h>
5188ba17	32	#include <unistd.h>
31652869	33	#include <stdarg.h>
cece208b	34	#include <string.h>
16fbe330	35
63b68889	36	#include "xmalloc.h"
31652869	37	#include "groupaccess.h"
63b68889	38	#include "match.h"
42f11eb2	39	#include "log.h"
63b68889	40
63b68889	41	static int ngroups;
13dff404	42	static char **groups_byname;
63b68889	43
255cabd9	44	/*
	45	* Initialize group access list for user with primary (base) and
	46	* supplementary groups. Return the number of groups in the list.
	47	*/
63b68889	48	int
	49	ga_init(const char *user, gid_t base)
	50	{
13dff404	51	gid_t *groups_bygid;
63b68889	52	int i, j;
	53	struct group *gr;
	54
	55	if (ngroups > 0)
	56	ga_free();
	57
13dff404	58	ngroups = NGROUPS_MAX;
	59	#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
	60	ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
	61	#endif
	62
01d35895	63	groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid));
01d35895	64	groups_byname = xcalloc(ngroups, sizeof(*groups_byname));
13dff404	65
63b68889	66	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
bbe88b6d	67	logit("getgrouplist: groups list too small");
63b68889	68	for (i = 0, j = 0; i < ngroups; i++)
	69	if ((gr = getgrgid(groups_bygid[i])) != NULL)
	70	groups_byname[j++] = xstrdup(gr->gr_name);
13dff404	71	xfree(groups_bygid);
63b68889	72	return (ngroups = j);
	73	}
	74
255cabd9	75	/*
	76	* Return 1 if one of user's groups is contained in groups.
	77	* Return 0 otherwise. Use match_pattern() for string comparison.
	78	*/
63b68889	79	int
	80	ga_match(char * const *groups, int n)
	81	{
	82	int i, j;
	83
	84	for (i = 0; i < ngroups; i++)
	85	for (j = 0; j < n; j++)
	86	if (match_pattern(groups_byname[i], groups[j]))
	87	return 1;
	88	return 0;
	89	}
	90
cece208b	91	/*
	92	* Return 1 if one of user's groups matches group_pattern list.
	93	* Return 0 on negated or no match.
	94	*/
	95	int
	96	ga_match_pattern_list(const char *group_pattern)
	97	{
	98	int i, found = 0;
	99	size_t len = strlen(group_pattern);
	100
	101	for (i = 0; i < ngroups; i++) {
	102	switch (match_pattern_list(groups_byname[i],
	103	group_pattern, len, 0)) {
	104	case -1:
	105	return 0; /* Negated match wins */
	106	case 0:
	107	continue;
	108	case 1:
	109	found = 1;
	110	}
	111	}
	112	return found;
	113	}
	114
255cabd9	115	/*
	116	* Free memory allocated for group access list.
	117	*/
63b68889	118	void
	119	ga_free(void)
	120	{
	121	int i;
	122
	123	if (ngroups > 0) {
	124	for (i = 0; i < ngroups; i++)
	125	xfree(groups_byname[i]);
	126	ngroups = 0;
13dff404	127	xfree(groups_byname);
63b68889	128	}
63b68889	129	}