authunix_prot.c revision 183550 
1/*	$NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
34static char *sccsid = "@(#)authunix_prot.c	2.1 88/07/29 4.0 RPCSRC";
35#endif
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sys/rpc/authunix_prot.c 183550 2008-10-02 15:37:58Z zec $");
38
39/*
40 * authunix_prot.c
41 * XDR for UNIX style authentication parameters for RPC
42 *
43 * Copyright (C) 1984, Sun Microsystems, Inc.
44 */
45
46#include <sys/param.h>
47#include <sys/kernel.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/systm.h>
51#include <sys/ucred.h>
52#include <sys/vimage.h>
53
54#include <rpc/types.h>
55#include <rpc/xdr.h>
56#include <rpc/auth.h>
57
58#include <rpc/rpc_com.h>
59
60/* gids compose part of a credential; there may not be more than 16 of them */
61#define NGRPS 16
62
63/*
64 * XDR for unix authentication parameters.
65 */
66bool_t
67xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred)
68{
69	uint32_t namelen;
70	uint32_t ngroups, i;
71	uint32_t junk;
72	INIT_VPROCG(TD_TO_VPROCG(&thread0)); /* XXX revisit - fixme! */
73
74	mtx_lock(&hostname_mtx);
75	if (xdrs->x_op == XDR_ENCODE) {
76		/*
77		 * Restrict name length to 255 according to RFC 1057.
78		 */
79		namelen = strlen(V_hostname);
80		if (namelen > 255)
81			namelen = 255;
82	} else {
83		namelen = 0;
84	}
85	junk = 0;
86
87	if (!xdr_uint32_t(xdrs, time)
88	    || !xdr_uint32_t(xdrs, &namelen))
89		return (FALSE);
90
91	/*
92	 * Ignore the hostname on decode.
93	 */
94	if (xdrs->x_op == XDR_ENCODE) {
95		if (!xdr_opaque(xdrs, V_hostname, namelen))
96			return (FALSE);
97	} else {
98		xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
99	}
100	mtx_unlock(&hostname_mtx);
101
102	if (!xdr_uint32_t(xdrs, &cred->cr_uid))
103		return (FALSE);
104	if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
105		return (FALSE);
106
107	if (xdrs->x_op == XDR_ENCODE) {
108		ngroups = cred->cr_ngroups - 1;
109		if (ngroups > NGRPS)
110			ngroups = NGRPS;
111	}
112
113	if (!xdr_uint32_t(xdrs, &ngroups))
114		return (FALSE);
115	for (i = 0; i < ngroups; i++) {
116		if (i + 1 < NGROUPS) {
117			if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
118				return (FALSE);
119		} else {
120			if (!xdr_uint32_t(xdrs, &junk))
121				return (FALSE);
122		}
123	}
124
125	if (xdrs->x_op == XDR_DECODE) {
126		if (ngroups + 1 > NGROUPS)
127			cred->cr_ngroups = NGROUPS;
128		else
129			cred->cr_ngroups = ngroups + 1;
130	}
131
132	return (TRUE);
133}
134