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/* $OpenBSD: groupaccess.c,v 1.17 2019/03/06 22:14:23 dtucker 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 <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <limits.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, retry = 0;
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));
while (getgrouplist(user, base, groups_bygid, &ngroups) == -1) {
if (retry++ > 0)
fatal("getgrouplist: groups list too small");
groups_bygid = xreallocarray(groups_bygid, ngroups,
sizeof(*groups_bygid));
}
groups_byname = xcalloc(ngroups, sizeof(*groups_byname));
for (i = 0, j = 0; i < ngroups; i++)
if ((gr = getgrgid(groups_bygid[i])) != NULL)
groups_byname[j++] = xstrdup(gr->gr_name);
free(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;
for (i = 0; i < ngroups; i++) {
switch (match_usergroup_pattern_list(groups_byname[i],
group_pattern)) {
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++)
free(groups_byname[i]);
ngroups = 0;
free(groups_byname);
groups_byname = NULL;
}
}
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