405 lines
10 KiB
C
405 lines
10 KiB
C
/* $NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $ */
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/*-
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* Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: getgroupmembership.c,v 1.4 2008/04/28 20:22:59 martin Exp $");
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#endif /* LIBC_SCCS and not lint */
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/*
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* calculate group access list
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <nsswitch.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef HESIOD
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#include <hesiod.h>
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#endif
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#include "gr_private.h"
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#ifdef __weak_alias
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__weak_alias(getgroupmembership,_getgroupmembership)
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#endif
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/*
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* __gr_addgid
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* Add gid to the groups array (of maxgrp size) at the position
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* indicated by *groupc, unless it already exists or *groupc is
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* past &groups[maxgrp].
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* Returns 1 upon success (including duplicate suppression), 0 otherwise.
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*/
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static int
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__gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *groupc)
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{
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int ret, dupc;
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_DIAGASSERT(groupc != NULL);
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_DIAGASSERT(groups != NULL);
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/* skip duplicates */
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for (dupc = 0; dupc < MIN(maxgrp, *groupc); dupc++) {
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if (groups[dupc] == gid)
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return 1;
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}
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ret = 1;
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if (*groupc < maxgrp) /* add this gid */
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groups[*groupc] = gid;
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else
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ret = 0;
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(*groupc)++;
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return ret;
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}
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/*ARGSUSED*/
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static int
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_files_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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gid_t agroup = va_arg(ap, gid_t);
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_files state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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while (__grscan_files(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_files(&state);
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return NS_NOTFOUND;
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}
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#ifdef HESIOD
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/*ARGSUSED*/
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static int
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_dns_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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gid_t agroup = va_arg(ap, gid_t);
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_dns state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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unsigned long id;
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void *context;
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char **hp, *cp, *ep;
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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hp = NULL;
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rv = NS_NOTFOUND;
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if (hesiod_init(&context) == -1) /* setup hesiod */
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return NS_UNAVAIL;
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hp = hesiod_resolve(context, uname, "grplist"); /* find grplist */
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if (hp == NULL) {
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if (errno != ENOENT) { /* wasn't "not found"*/
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rv = NS_UNAVAIL;
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goto dnsgroupmembers_out;
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}
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/* grplist not found, fallback to _dns_grscan */
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memset(&state, 0, sizeof(state));
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while (__grscan_dns(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp,
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groupc))
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*result = -1;
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break;
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}
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}
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__grend_dns(&state);
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rv = NS_NOTFOUND;
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goto dnsgroupmembers_out;
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}
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if ((ep = strchr(hp[0], '\n')) != NULL)
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*ep = '\0'; /* clear trailing \n */
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for (cp = hp[0]; *cp != '\0'; ) { /* parse grplist */
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if ((cp = strchr(cp, ':')) == NULL) /* skip grpname */
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break;
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cp++;
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id = strtoul(cp, &ep, 10); /* parse gid */
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if (id > GID_MAX || (*ep != ':' && *ep != '\0')) {
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rv = NS_UNAVAIL;
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goto dnsgroupmembers_out;
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}
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cp = ep;
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if (*cp == ':')
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cp++;
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/* add gid */
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if (! __gr_addgid((gid_t)id, groups, maxgrp, groupc))
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*result = -1;
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}
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rv = NS_NOTFOUND;
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dnsgroupmembers_out:
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if (hp)
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hesiod_free_list(context, hp);
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hesiod_end(context);
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return rv;
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}
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#endif /* HESIOD */
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#ifdef YP
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/*ARGSUSED*/
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static int
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_nis_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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gid_t agroup = va_arg(ap, gid_t);
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_nis state;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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while (__grscan_nis(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0) == NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_nis(&state);
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return NS_NOTFOUND;
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}
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#endif /* YP */
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#ifdef _GROUP_COMPAT
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struct __compatggm {
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const char *uname; /* user to search for */
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gid_t *groups;
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gid_t agroup;
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int maxgrp;
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int *groupc;
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};
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static int
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_compat_ggm_search(void *cookie, struct group **groupres)
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{
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struct __compatggm *cp;
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int rerror, crv;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(__grbad_compat, "files")
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NS_DNS_CB(_dns_getgroupmembership, NULL)
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NS_NIS_CB(_nis_getgroupmembership, NULL)
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NS_COMPAT_CB(__grbad_compat, "compat")
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NS_NULL_CB
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};
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*groupres = NULL; /* we don't care about this */
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cp = (struct __compatggm *)cookie;
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crv = nsdispatch(NULL, dtab,
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NSDB_GROUP_COMPAT, "getgroupmembership",
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__nsdefaultnis,
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&rerror, cp->uname, cp->agroup, cp->groups, cp->maxgrp, cp->groupc);
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if (crv == NS_SUCCESS)
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crv = NS_NOTFOUND; /* indicate "no more +: entries" */
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return crv;
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}
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/* ARGSUSED */
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static int
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_compat_getgroupmembership(void *retval, void *cb_data, va_list ap)
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{
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int *result = va_arg(ap, int *);
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const char *uname = va_arg(ap, const char *);
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gid_t agroup = va_arg(ap, gid_t);
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gid_t *groups = va_arg(ap, gid_t *);
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int maxgrp = va_arg(ap, int);
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int *groupc = va_arg(ap, int *);
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struct __grstate_compat state;
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struct __compatggm ggmstate;
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struct group grp;
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char grpbuf[_GETGR_R_SIZE_MAX];
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int rv, i;
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_DIAGASSERT(result != NULL);
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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/* install primary group */
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(void) __gr_addgid(agroup, groups, maxgrp, groupc);
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memset(&state, 0, sizeof(state));
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memset(&ggmstate, 0, sizeof(ggmstate));
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ggmstate.uname = uname;
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ggmstate.groups = groups;
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ggmstate.agroup = agroup;
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ggmstate.maxgrp = maxgrp;
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ggmstate.groupc = groupc;
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while (__grscan_compat(&rv, &grp, grpbuf, sizeof(grpbuf), &state,
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0, NULL, 0, _compat_ggm_search, &ggmstate)
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== NS_SUCCESS) {
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/* scan members */
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for (i = 0; grp.gr_mem[i]; i++) {
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if (strcmp(grp.gr_mem[i], uname) != 0)
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continue;
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if (! __gr_addgid(grp.gr_gid, groups, maxgrp, groupc))
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*result = -1;
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break;
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}
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}
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__grend_compat(&state);
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return NS_NOTFOUND;
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}
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#endif /* _GROUP_COMPAT */
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int
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getgroupmembership(const char *uname, gid_t agroup,
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gid_t *groups, int maxgrp, int *groupc)
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{
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int rerror;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_getgroupmembership, NULL)
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NS_DNS_CB(_dns_getgroupmembership, NULL)
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NS_NIS_CB(_nis_getgroupmembership, NULL)
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NS_COMPAT_CB(_compat_getgroupmembership, NULL)
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NS_NULL_CB
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};
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_DIAGASSERT(uname != NULL);
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/* groups may be NULL if just sizing when invoked with maxgrp = 0 */
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_DIAGASSERT(groupc != NULL);
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*groupc = 0;
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mutex_lock(&__grmutex);
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/*
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* Call each backend.
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* For compatibility with getgrent(3) semantics,
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* a backend should return NS_NOTFOUND even upon
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* completion, to allow result merging to occur.
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*/
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(void) nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
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__nsdefaultcompat,
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&rerror, uname, agroup, groups, maxgrp, groupc);
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mutex_unlock(&__grmutex);
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if (*groupc > maxgrp) /* too many groups found */
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return -1;
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else
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return 0;
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}
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