svc_auth_unix.c revision 225736 
1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
32static char *sccsid = "@(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC";
33#endif
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: stable/9/lib/libc/rpc/svc_auth_unix.c 136581 2004-10-16 06:11:35Z obrien $");
36
37/*
38 * svc_auth_unix.c
39 * Handles UNIX flavor authentication parameters on the service side of rpc.
40 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
41 * _svcauth_unix does full blown unix style uid,gid+gids auth,
42 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
43 * Note: the shorthand has been gutted for efficiency.
44 *
45 * Copyright (C) 1984, Sun Microsystems, Inc.
46 */
47
48#include "namespace.h"
49#include <assert.h>
50#include <stdio.h>
51#include <string.h>
52
53#include <rpc/rpc.h>
54#include "un-namespace.h"
55
56/*
57 * Unix longhand authenticator
58 */
59enum auth_stat
60_svcauth_unix(rqst, msg)
61	struct svc_req *rqst;
62	struct rpc_msg *msg;
63{
64	enum auth_stat stat;
65	XDR xdrs;
66	struct authunix_parms *aup;
67	int32_t *buf;
68	struct area {
69		struct authunix_parms area_aup;
70		char area_machname[MAX_MACHINE_NAME+1];
71		int area_gids[NGRPS];
72	} *area;
73	u_int auth_len;
74	size_t str_len, gid_len;
75	u_int i;
76
77	assert(rqst != NULL);
78	assert(msg != NULL);
79
80	area = (struct area *) rqst->rq_clntcred;
81	aup = &area->area_aup;
82	aup->aup_machname = area->area_machname;
83	aup->aup_gids = area->area_gids;
84	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
85	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
86	buf = XDR_INLINE(&xdrs, auth_len);
87	if (buf != NULL) {
88		aup->aup_time = IXDR_GET_INT32(buf);
89		str_len = (size_t)IXDR_GET_U_INT32(buf);
90		if (str_len > MAX_MACHINE_NAME) {
91			stat = AUTH_BADCRED;
92			goto done;
93		}
94		memmove(aup->aup_machname, buf, str_len);
95		aup->aup_machname[str_len] = 0;
96		str_len = RNDUP(str_len);
97		buf += str_len / sizeof (int32_t);
98		aup->aup_uid = (int)IXDR_GET_INT32(buf);
99		aup->aup_gid = (int)IXDR_GET_INT32(buf);
100		gid_len = (size_t)IXDR_GET_U_INT32(buf);
101		if (gid_len > NGRPS) {
102			stat = AUTH_BADCRED;
103			goto done;
104		}
105		aup->aup_len = gid_len;
106		for (i = 0; i < gid_len; i++) {
107			aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
108		}
109		/*
110		 * five is the smallest unix credentials structure -
111		 * timestamp, hostname len (0), uid, gid, and gids len (0).
112		 */
113		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
114			(void) printf("bad auth_len gid %ld str %ld auth %u\n",
115			    (long)gid_len, (long)str_len, auth_len);
116			stat = AUTH_BADCRED;
117			goto done;
118		}
119	} else if (! xdr_authunix_parms(&xdrs, aup)) {
120		xdrs.x_op = XDR_FREE;
121		(void)xdr_authunix_parms(&xdrs, aup);
122		stat = AUTH_BADCRED;
123		goto done;
124	}
125
126       /* get the verifier */
127	if ((u_int)msg->rm_call.cb_verf.oa_length) {
128		rqst->rq_xprt->xp_verf.oa_flavor =
129			msg->rm_call.cb_verf.oa_flavor;
130		rqst->rq_xprt->xp_verf.oa_base =
131			msg->rm_call.cb_verf.oa_base;
132		rqst->rq_xprt->xp_verf.oa_length =
133			msg->rm_call.cb_verf.oa_length;
134	} else {
135		rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
136		rqst->rq_xprt->xp_verf.oa_length = 0;
137	}
138	stat = AUTH_OK;
139done:
140	XDR_DESTROY(&xdrs);
141	return (stat);
142}
143
144
145/*
146 * Shorthand unix authenticator
147 * Looks up longhand in a cache.
148 */
149/*ARGSUSED*/
150enum auth_stat
151_svcauth_short(rqst, msg)
152	struct svc_req *rqst;
153	struct rpc_msg *msg;
154{
155	return (AUTH_REJECTEDCRED);
156}
157