svc_auth_sys.c revision 1219:f89f56c2d9ac 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
29/* All Rights Reserved */
30/*
31 * Portions of this source code were derived from Berkeley
32 * 4.3 BSD under license from the Regents of the University of
33 * California.
34 */
35
36#pragma ident	"%Z%%M%	%I%	%E% SMI"
37
38/*
39 * Handles UNIX flavor authentication parameters on the service side of rpc.
40 * There are two svc auth implementations here: AUTH_SYS and AUTH_SHORT.
41 * __svcauth_sys does full blown unix style uid, gid+gids auth,
42 * __svcauth_short uses a shorthand auth to index into a cache of
43 *	longhand auths.
44 * Note: the shorthand has been gutted for efficiency.
45 *
46 */
47
48#include "mt.h"
49#include <stdio.h>
50#include <rpc/rpc.h>
51#include <syslog.h>
52#include <sys/types.h>
53#include <string.h>
54
55/*
56 * System (Unix) longhand authenticator
57 */
58enum auth_stat
59__svcauth_sys(struct svc_req *rqst, struct rpc_msg *msg)
60{
61	enum auth_stat stat;
62	XDR xdrs;
63	struct authsys_parms *aup;
64	rpc_inline_t *buf;
65	struct area {
66		struct authsys_parms area_aup;
67		char area_machname[MAX_MACHINE_NAME+1];
68		gid_t area_gids[NGRPS];
69	} *area;
70	uint_t auth_len;
71	uint_t str_len, gid_len;
72	int i;
73
74	/* LINTED pointer cast */
75	area = (struct area *)rqst->rq_clntcred;
76	aup = &area->area_aup;
77	aup->aup_machname = area->area_machname;
78	aup->aup_gids = area->area_gids;
79	auth_len = (uint_t)msg->rm_call.cb_cred.oa_length;
80	if (auth_len == 0)
81		return (AUTH_BADCRED);
82	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
83			XDR_DECODE);
84	buf = XDR_INLINE(&xdrs, auth_len);
85	if (buf != NULL) {
86		aup->aup_time = IXDR_GET_INT32(buf);
87		str_len = IXDR_GET_U_INT32(buf);
88		if (str_len > MAX_MACHINE_NAME) {
89			stat = AUTH_BADCRED;
90			goto done;
91		}
92		(void) memcpy(aup->aup_machname, buf, str_len);
93		aup->aup_machname[str_len] = 0;
94		str_len = RNDUP(str_len);
95		buf += str_len / (int)sizeof (int32_t);
96		aup->aup_uid = IXDR_GET_INT32(buf);
97		aup->aup_gid = IXDR_GET_INT32(buf);
98		gid_len = IXDR_GET_U_INT32(buf);
99		if (gid_len > NGRPS) {
100			stat = AUTH_BADCRED;
101			goto done;
102		}
103		aup->aup_len = gid_len;
104		for (i = 0; i < gid_len; i++) {
105			aup->aup_gids[i] = (gid_t)IXDR_GET_INT32(buf);
106		}
107		/*
108		 * five is the smallest unix credentials structure -
109		 * timestamp, hostname len (0), uid, gid, and gids len (0).
110		 */
111		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
112			(void) syslog(LOG_ERR,
113				"bad auth_len gid %d str %d auth %d",
114					gid_len, str_len, auth_len);
115			stat = AUTH_BADCRED;
116			goto done;
117		}
118	} else if (! xdr_authsys_parms(&xdrs, aup)) {
119		xdrs.x_op = XDR_FREE;
120		(void) xdr_authsys_parms(&xdrs, aup);
121		stat = AUTH_BADCRED;
122		goto done;
123	}
124	rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
125	rqst->rq_xprt->xp_verf.oa_length = 0;
126	stat = AUTH_OK;
127done:
128	XDR_DESTROY(&xdrs);
129	return (stat);
130}
131
132/*
133 * Shorthand unix authenticator
134 * Looks up longhand in a cache.
135 */
136/*ARGSUSED*/
137enum auth_stat
138__svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
139{
140	return (AUTH_REJECTEDCRED);
141}
142
143/*
144 * Unix longhand authenticator. Will be obsoleted
145 */
146enum auth_stat
147__svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
148{
149	return (__svcauth_sys(rqst, msg));
150}
151