svc_auth_unix.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
33static char *sccsid = "@(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC";
34#endif
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/sys/rpc/svc_auth_unix.c 330897 2018-03-14 03:19:51Z eadler $");
37
38/*
39 * svc_auth_unix.c
40 * Handles UNIX flavor authentication parameters on the service side of rpc.
41 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
42 * _svcauth_unix does full blown unix style uid,gid+gids auth,
43 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
44 * Note: the shorthand has been gutted for efficiency.
45 *
46 * Copyright (C) 1984, Sun Microsystems, Inc.
47 */
48
49#include <sys/param.h>
50#include <sys/lock.h>
51#include <sys/mutex.h>
52#include <sys/systm.h>
53#include <sys/ucred.h>
54
55#include <rpc/rpc.h>
56
57#include <rpc/rpc_com.h>
58
59#define MAX_MACHINE_NAME	255
60#define NGRPS			16
61
62/*
63 * Unix longhand authenticator
64 */
65enum auth_stat
66_svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
67{
68	enum auth_stat stat;
69	XDR xdrs;
70	int32_t *buf;
71	uint32_t time;
72	struct xucred *xcr;
73	u_int auth_len;
74	size_t str_len, gid_len;
75	u_int i;
76
77	xcr = rqst->rq_clntcred;
78	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
79	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
80	    XDR_DECODE);
81	buf = XDR_INLINE(&xdrs, auth_len);
82	if (buf != NULL) {
83		time = IXDR_GET_UINT32(buf);
84		str_len = (size_t)IXDR_GET_UINT32(buf);
85		if (str_len > MAX_MACHINE_NAME) {
86			stat = AUTH_BADCRED;
87			goto done;
88		}
89		str_len = RNDUP(str_len);
90		buf += str_len / sizeof (int32_t);
91		xcr->cr_uid = IXDR_GET_UINT32(buf);
92		xcr->cr_groups[0] = IXDR_GET_UINT32(buf);
93		gid_len = (size_t)IXDR_GET_UINT32(buf);
94		if (gid_len > NGRPS) {
95			stat = AUTH_BADCRED;
96			goto done;
97		}
98		for (i = 0; i < gid_len; i++) {
99			if (i + 1 < XU_NGROUPS)
100				xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf);
101			else
102				buf++;
103		}
104		if (gid_len + 1 > XU_NGROUPS)
105			xcr->cr_ngroups = XU_NGROUPS;
106		else
107			xcr->cr_ngroups = gid_len + 1;
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, &time, xcr)) {
120		stat = AUTH_BADCRED;
121		goto done;
122	}
123
124	rqst->rq_verf = _null_auth;
125	stat = AUTH_OK;
126done:
127	XDR_DESTROY(&xdrs);
128
129	return (stat);
130}
131
132
133/*
134 * Shorthand unix authenticator
135 * Looks up longhand in a cache.
136 */
137/*ARGSUSED*/
138enum auth_stat
139_svcauth_short(rqst, msg)
140	struct svc_req *rqst;
141	struct rpc_msg *msg;
142{
143	return (AUTH_REJECTEDCRED);
144}
145