xref: /freebsd/sys/rpc/authunix_prot.c (revision 721351876cd4d3a8a700f62d2061331fa951a488)
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)
33 static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)authunix_prot.c	2.1 88/07/29 4.0 RPCSRC";
35 #endif
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
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  */
63 bool_t
64 xdr_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 		namelen = strlen(hostname);
72 	} else {
73 		namelen = 0;
74 	}
75 	junk = 0;
76 
77 	if (!xdr_uint32_t(xdrs, time)
78 	    || !xdr_uint32_t(xdrs, &namelen))
79 		return (FALSE);
80 
81 	/*
82 	 * Ignore the hostname on decode.
83 	 */
84 	if (xdrs->x_op == XDR_ENCODE) {
85 		if (!xdr_opaque(xdrs, hostname, namelen))
86 			return (FALSE);
87 	} else {
88 		xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen));
89 	}
90 
91 	if (!xdr_uint32_t(xdrs, &cred->cr_uid))
92 		return (FALSE);
93 	if (!xdr_uint32_t(xdrs, &cred->cr_groups[0]))
94 		return (FALSE);
95 
96 	if (xdrs->x_op == XDR_ENCODE) {
97 		ngroups = cred->cr_ngroups - 1;
98 		if (ngroups > NGRPS)
99 			ngroups = NGRPS;
100 	}
101 
102 	if (!xdr_uint32_t(xdrs, &ngroups))
103 		return (FALSE);
104 	for (i = 0; i < ngroups; i++) {
105 		if (i + 1 < NGROUPS) {
106 			if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1]))
107 				return (FALSE);
108 		} else {
109 			if (!xdr_uint32_t(xdrs, &junk))
110 				return (FALSE);
111 		}
112 	}
113 
114 	if (xdrs->x_op == XDR_DECODE) {
115 		if (ngroups + 1 > NGROUPS)
116 			cred->cr_ngroups = NGROUPS;
117 		else
118 			cred->cr_ngroups = ngroups + 1;
119 	}
120 
121 	return (TRUE);
122 }
123