135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* $OpenBSD: groupaccess.c,v 1.17 2019/03/06 22:14:23 dtucker 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 "includes.h"
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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;
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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;
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int i, j, retry = 0;
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struct group *gr;
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if (ngroups > 0)
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ga_free();
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ngroups = NGROUPS_MAX;
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#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
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ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
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#endif
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groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid));
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while (getgrouplist(user, base, groups_bygid, &ngroups) == -1) {
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if (retry++ > 0)
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fatal("getgrouplist: groups list too small");
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groups_bygid = xreallocarray(groups_bygid, ngroups,
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sizeof(*groups_bygid));
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}
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groups_byname = xcalloc(ngroups, sizeof(*groups_byname));
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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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free(groups_bygid);
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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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free(groups_byname);
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groups_byname = NULL;
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}
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}
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