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/8.3/sys/rpc/authunix_prot.c 204293 2010-02-24 22:16:16Z brooks $");
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 */
64 bool_t
65 xdr_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_max + 1) {
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_max + 1)
124 cred->cr_ngroups = ngroups_max + 1;
125 else
126 cred->cr_ngroups = ngroups + 1;
127 }
128
129 return (TRUE);
130 }
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