authunix_prot.c revision 180025 
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 180025 2008-06-26 10:21:54Z dfr $");
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/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
70	if (xdrs->x_op == XDR_ENCODE) {
71		/*
72		 * Restrict name length to 255 according to RFC 1057.
73		 */
74		namelen = strlen(hostname);
75		if (namelen > 255)
76			namelen = 255;
77	} else {
78		namelen = 0;
79	}
80	junk = 0;
81
82	if (!xdr_uint32_t(xdrs, time)
83	    || !xdr_uint32_t(xdrs, &namelen))
84		return (FALSE);
85
86	/*
87	 * Ignore the hostname on decode.
88	 */
89	if (xdrs->x_op == XDR_ENCODE) {
90		if (!xdr_opaque(xdrs, hostname, namelen))
91			return (FALSE);
92	} else {
93		xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
94	}
95
96	if (!xdr_uint32_t(xdrs, &cred->cr_uid))
97		return (FALSE);
98	if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
99		return (FALSE);
100
101	if (xdrs->x_op == XDR_ENCODE) {
102		ngroups = cred->cr_ngroups - 1;
103		if (ngroups > NGRPS)
104			ngroups = NGRPS;
105	}
106
107	if (!xdr_uint32_t(xdrs, &ngroups))
108		return (FALSE);
109	for (i = 0; i < ngroups; i++) {
110		if (i + 1 < NGROUPS) {
111			if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
112				return (FALSE);
113		} else {
114			if (!xdr_uint32_t(xdrs, &junk))
115				return (FALSE);
116		}
117	}
118
119	if (xdrs->x_op == XDR_DECODE) {
120		if (ngroups + 1 > NGROUPS)
121			cred->cr_ngroups = NGROUPS;
122		else
123			cred->cr_ngroups = ngroups + 1;
124	}
125
126	return (TRUE);
127}
128