1/*	$NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft Exp $	*/
2
3/*-
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
33static char *sccsid = "@(#)authunix_prot.c	2.1 88/07/29 4.0 RPCSRC";
34#endif
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38/*
39 * authunix_prot.c
40 * XDR for UNIX style authentication parameters for RPC
41 *
42 * Copyright (C) 1984, Sun Microsystems, Inc.
43 */
44
45#include <sys/param.h>
46#include <sys/jail.h>
47#include <sys/kernel.h>
48#include <sys/systm.h>
49#include <sys/ucred.h>
50
51#include <rpc/types.h>
52#include <rpc/xdr.h>
53#include <rpc/auth.h>
54
55#include <rpc/rpc_com.h>
56
57/* gids compose part of a credential; there may not be more than 16 of them */
58#define NGRPS 16
59
60/*
61 * XDR for unix authentication parameters.
62 */
63bool_t
64xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred)
65{
66	uint32_t namelen;
67	uint32_t ngroups, i;
68	uint32_t junk;
69	char hostbuf[MAXHOSTNAMELEN];
70
71	if (xdrs->x_op == XDR_ENCODE) {
72		/*
73		 * Restrict name length to 255 according to RFC 1057.
74		 */
75		getcredhostname(NULL, hostbuf, sizeof(hostbuf));
76		namelen = strlen(hostbuf);
77		if (namelen > 255)
78			namelen = 255;
79	} else {
80		namelen = 0;
81	}
82	junk = 0;
83
84	if (!xdr_uint32_t(xdrs, time)
85	    || !xdr_uint32_t(xdrs, &namelen))
86		return (FALSE);
87
88	/*
89	 * Ignore the hostname on decode.
90	 */
91	if (xdrs->x_op == XDR_ENCODE) {
92		if (!xdr_opaque(xdrs, hostbuf, namelen))
93			return (FALSE);
94	} else {
95		xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
96	}
97
98	if (!xdr_uint32_t(xdrs, &cred->cr_uid))
99		return (FALSE);
100	if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
101		return (FALSE);
102
103	if (xdrs->x_op == XDR_ENCODE) {
104		ngroups = cred->cr_ngroups - 1;
105		if (ngroups > NGRPS)
106			ngroups = NGRPS;
107	}
108
109	if (!xdr_uint32_t(xdrs, &ngroups))
110		return (FALSE);
111	for (i = 0; i < ngroups; i++) {
112		if (i + 1 < ngroups_max + 1) {
113			if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
114				return (FALSE);
115		} else {
116			if (!xdr_uint32_t(xdrs, &junk))
117				return (FALSE);
118		}
119	}
120
121	if (xdrs->x_op == XDR_DECODE) {
122		if (ngroups + 1 > ngroups_max + 1)
123			cred->cr_ngroups = ngroups_max + 1;
124		else
125			cred->cr_ngroups = ngroups + 1;
126	}
127
128	return (TRUE);
129}
130