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: src/sys/rpc/authunix_prot.c,v 1.6 2008/10/02 15:37:58 zec Exp $");
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 */
66 bool_t
67 xdr_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
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