authunix_prot.c revision 193066 
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 193066 2009-05-29 21:27:12Z jamie $");
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/jail.h>
48#include <sys/kernel.h>
49#include <sys/systm.h>
50#include <sys/ucred.h>
51
52#include <rpc/types.h>
53#include <rpc/xdr.h>
54#include <rpc/auth.h>
55
56#include <rpc/rpc_com.h>
57
58/* gids compose part of a credential; there may not be more than 16 of them */
59#define NGRPS 16
60
61/*
62 * XDR for unix authentication parameters.
63 */
64bool_t
65xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred)
66{
67	uint32_t namelen;
68	uint32_t ngroups, i;
69	uint32_t junk;
70	char hostbuf[MAXHOSTNAMELEN];
71
72	if (xdrs->x_op == XDR_ENCODE) {
73		/*
74		 * Restrict name length to 255 according to RFC 1057.
75		 */
76		getcredhostname(NULL, hostbuf, sizeof(hostbuf));
77		namelen = strlen(hostbuf);
78		if (namelen > 255)
79			namelen = 255;
80	} else {
81		namelen = 0;
82	}
83	junk = 0;
84
85	if (!xdr_uint32_t(xdrs, time)
86	    || !xdr_uint32_t(xdrs, &namelen))
87		return (FALSE);
88
89	/*
90	 * Ignore the hostname on decode.
91	 */
92	if (xdrs->x_op == XDR_ENCODE) {
93		if (!xdr_opaque(xdrs, hostbuf, namelen))
94			return (FALSE);
95	} else {
96		xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
97	}
98
99	if (!xdr_uint32_t(xdrs, &cred->cr_uid))
100		return (FALSE);
101	if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
102		return (FALSE);
103
104	if (xdrs->x_op == XDR_ENCODE) {
105		ngroups = cred->cr_ngroups - 1;
106		if (ngroups > NGRPS)
107			ngroups = NGRPS;
108	}
109
110	if (!xdr_uint32_t(xdrs, &ngroups))
111		return (FALSE);
112	for (i = 0; i < ngroups; i++) {
113		if (i + 1 < NGROUPS) {
114			if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
115				return (FALSE);
116		} else {
117			if (!xdr_uint32_t(xdrs, &junk))
118				return (FALSE);
119		}
120	}
121
122	if (xdrs->x_op == XDR_DECODE) {
123		if (ngroups + 1 > NGROUPS)
124			cred->cr_ngroups = NGROUPS;
125		else
126			cred->cr_ngroups = ngroups + 1;
127	}
128
129	return (TRUE);
130}
131