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Our kernel supports 16 groups (NGROUPS_MAX), but nothing prevents an admin from adding a user to more groups. With that tweak we'll keep on ignoring them instead of potentially reading past the buffer passed to getgrouplist(3). That behavior is explicitely described in initgroups(3). ok millert@ gilles@
122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/* $OpenBSD: groupaccess.c,v 1.18 2024/11/04 21:59:15 jca Exp $ */
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/*
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* Copyright (c) 2001 Kevin Steves. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <grp.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "xmalloc.h"
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#include "groupaccess.h"
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#include "match.h"
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#include "log.h"
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static int ngroups;
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static char *groups_byname[NGROUPS_MAX + 1]; /* +1 for base/primary group */
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/*
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* Initialize group access list for user with primary (base) and
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* supplementary groups. Return the number of groups in the list.
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*/
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int
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ga_init(const char *user, gid_t base)
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{
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gid_t groups_bygid[NGROUPS_MAX + 1];
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int i, j, maxgroups;
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struct group *gr;
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if (ngroups > 0)
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ga_free();
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maxgroups = ngroups = sizeof(groups_bygid) / sizeof(gid_t);
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if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) {
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logit("getgrouplist: groups list too small");
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/* Truncate group list */
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ngroups = maxgroups;
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}
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for (i = 0, j = 0; i < ngroups; i++)
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if ((gr = getgrgid(groups_bygid[i])) != NULL)
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groups_byname[j++] = xstrdup(gr->gr_name);
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return (ngroups = j);
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}
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/*
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* Return 1 if one of user's groups is contained in groups.
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* Return 0 otherwise. Use match_pattern() for string comparison.
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*/
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int
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ga_match(char * const *groups, int n)
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{
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int i, j;
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for (i = 0; i < ngroups; i++)
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for (j = 0; j < n; j++)
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if (match_pattern(groups_byname[i], groups[j]))
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return 1;
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return 0;
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}
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/*
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* Return 1 if one of user's groups matches group_pattern list.
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* Return 0 on negated or no match.
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*/
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int
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ga_match_pattern_list(const char *group_pattern)
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{
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int i, found = 0;
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for (i = 0; i < ngroups; i++) {
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switch (match_usergroup_pattern_list(groups_byname[i],
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group_pattern)) {
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case -1:
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return 0; /* Negated match wins */
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case 0:
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continue;
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case 1:
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found = 1;
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}
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}
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return found;
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}
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/*
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* Free memory allocated for group access list.
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*/
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void
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ga_free(void)
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{
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int i;
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if (ngroups > 0) {
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for (i = 0; i < ngroups; i++)
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free(groups_byname[i]);
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ngroups = 0;
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}
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}
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