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: releng/6.4/sys/rpc/authunix_prot.c 178459 2008-04-24 10:46:25Z 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 */
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 }
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