svc_auth_unix.c revision 261046 
1/*-
2 * Copyright (c) 2009, Sun Microsystems, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 *   this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 *   this list of conditions and the following disclaimer in the documentation
11 *   and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 *   contributors may be used to endorse or promote products derived
14 *   from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#if defined(LIBC_SCCS) && !defined(lint)
30static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
31static char *sccsid = "@(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC";
32#endif
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/10/lib/libc/rpc/svc_auth_unix.c 261046 2014-01-22 23:45:27Z mav $");
35
36/*
37 * svc_auth_unix.c
38 * Handles UNIX flavor authentication parameters on the service side of rpc.
39 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
40 * _svcauth_unix does full blown unix style uid,gid+gids auth,
41 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
42 * Note: the shorthand has been gutted for efficiency.
43 *
44 * Copyright (C) 1984, Sun Microsystems, Inc.
45 */
46
47#include "namespace.h"
48#include <assert.h>
49#include <stdio.h>
50#include <string.h>
51
52#include <rpc/rpc.h>
53#include "un-namespace.h"
54
55/*
56 * Unix longhand authenticator
57 */
58enum auth_stat
59_svcauth_unix(rqst, msg)
60	struct svc_req *rqst;
61	struct rpc_msg *msg;
62{
63	enum auth_stat stat;
64	XDR xdrs;
65	struct authunix_parms *aup;
66	int32_t *buf;
67	struct area {
68		struct authunix_parms area_aup;
69		char area_machname[MAX_MACHINE_NAME+1];
70		u_int area_gids[NGRPS];
71	} *area;
72	u_int auth_len;
73	size_t str_len, gid_len;
74	u_int i;
75
76	assert(rqst != NULL);
77	assert(msg != NULL);
78
79	area = (struct area *) rqst->rq_clntcred;
80	aup = &area->area_aup;
81	aup->aup_machname = area->area_machname;
82	aup->aup_gids = area->area_gids;
83	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
84	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
85	buf = XDR_INLINE(&xdrs, auth_len);
86	if (buf != NULL) {
87		aup->aup_time = IXDR_GET_INT32(buf);
88		str_len = (size_t)IXDR_GET_U_INT32(buf);
89		if (str_len > MAX_MACHINE_NAME) {
90			stat = AUTH_BADCRED;
91			goto done;
92		}
93		memmove(aup->aup_machname, buf, str_len);
94		aup->aup_machname[str_len] = 0;
95		str_len = RNDUP(str_len);
96		buf += str_len / sizeof (int32_t);
97		aup->aup_uid = (int)IXDR_GET_INT32(buf);
98		aup->aup_gid = (int)IXDR_GET_INT32(buf);
99		gid_len = (size_t)IXDR_GET_U_INT32(buf);
100		if (gid_len > NGRPS) {
101			stat = AUTH_BADCRED;
102			goto done;
103		}
104		aup->aup_len = gid_len;
105		for (i = 0; i < gid_len; i++) {
106			aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
107		}
108		/*
109		 * five is the smallest unix credentials structure -
110		 * timestamp, hostname len (0), uid, gid, and gids len (0).
111		 */
112		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
113			(void) printf("bad auth_len gid %ld str %ld auth %u\n",
114			    (long)gid_len, (long)str_len, auth_len);
115			stat = AUTH_BADCRED;
116			goto done;
117		}
118	} else if (! xdr_authunix_parms(&xdrs, aup)) {
119		xdrs.x_op = XDR_FREE;
120		(void)xdr_authunix_parms(&xdrs, aup);
121		stat = AUTH_BADCRED;
122		goto done;
123	}
124
125       /* get the verifier */
126	if ((u_int)msg->rm_call.cb_verf.oa_length) {
127		rqst->rq_xprt->xp_verf.oa_flavor =
128			msg->rm_call.cb_verf.oa_flavor;
129		rqst->rq_xprt->xp_verf.oa_base =
130			msg->rm_call.cb_verf.oa_base;
131		rqst->rq_xprt->xp_verf.oa_length =
132			msg->rm_call.cb_verf.oa_length;
133	} else {
134		rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
135		rqst->rq_xprt->xp_verf.oa_length = 0;
136	}
137	stat = AUTH_OK;
138done:
139	XDR_DESTROY(&xdrs);
140	return (stat);
141}
142
143
144/*
145 * Shorthand unix authenticator
146 * Looks up longhand in a cache.
147 */
148/*ARGSUSED*/
149enum auth_stat
150_svcauth_short(rqst, msg)
151	struct svc_req *rqst;
152	struct rpc_msg *msg;
153{
154	return (AUTH_REJECTEDCRED);
155}
156