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 * Copyright 2017 Joyent Inc
26 * Use is subject to license terms.
27 */
28
29 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
30 /* All Rights Reserved */
31 /*
32 * Portions of this source code were derived from Berkeley
33 * 4.3 BSD under license from the Regents of the University of
34 * California.
35 */
36
37 /*
38 * Handles UNIX flavor authentication parameters on the service side of rpc.
39 * There are two svc auth implementations here: AUTH_SYS and AUTH_SHORT.
40 * __svcauth_sys does full blown unix style uid, gid+gids auth,
41 * __svcauth_short uses a shorthand auth to index into a cache of
42 * longhand auths.
43 * Note: the shorthand has been gutted for efficiency.
44 *
45 */
46
47 #include "mt.h"
48 #include <stdio.h>
49 #include <rpc/rpc.h>
50 #include <syslog.h>
51 #include <sys/types.h>
52 #include <sys/debug.h>
53 #include <string.h>
54
55 /*
56 * NOTE: this has to fit inside RQCRED_SIZE bytes. If you update this struct,
57 * double-check it still fits.
58 */
59 struct authsys_area {
60 struct authsys_parms area_aup;
61 char area_machname[MAX_MACHINE_NAME+1];
62 gid_t area_gids[NGRPS];
63 };
64 CTASSERT(sizeof (struct authsys_area) <= RQCRED_SIZE);
65
66 /*
67 * System (Unix) longhand authenticator
68 */
69 enum auth_stat
__svcauth_sys(struct svc_req * rqst,struct rpc_msg * msg)70 __svcauth_sys(struct svc_req *rqst, struct rpc_msg *msg)
71 {
72 struct authsys_parms *aup;
73 int32_t *buf;
74 struct authsys_area *area;
75 uint_t auth_len;
76 uint_t str_len, gid_len;
77 int i;
78
79 /* LINTED pointer cast */
80 area = (struct authsys_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 = msg->rm_call.cb_cred.oa_length;
85 if (auth_len == 0)
86 return (AUTH_BADCRED);
87
88 /* LINTED pointer cast */
89 buf = (int32_t *)msg->rm_call.cb_cred.oa_base;
90
91 aup->aup_time = IXDR_GET_INT32(buf);
92 str_len = IXDR_GET_U_INT32(buf);
93 if (str_len > MAX_MACHINE_NAME)
94 return (AUTH_BADCRED);
95 (void) memcpy(aup->aup_machname, buf, str_len);
96 aup->aup_machname[str_len] = 0;
97 str_len = RNDUP(str_len);
98 buf += str_len / (int)sizeof (int32_t);
99 aup->aup_uid = IXDR_GET_INT32(buf);
100 aup->aup_gid = IXDR_GET_INT32(buf);
101 gid_len = IXDR_GET_U_INT32(buf);
102 if (gid_len > NGRPS)
103 return (AUTH_BADCRED);
104 aup->aup_len = gid_len;
105 for (i = 0; i < gid_len; i++) {
106 aup->aup_gids[i] = (gid_t)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 return (AUTH_BADCRED);
114
115 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
116 rqst->rq_xprt->xp_verf.oa_length = 0;
117
118 return (AUTH_OK);
119 }
120
121 /*
122 * Shorthand unix authenticator
123 * Looks up longhand in a cache.
124 */
125 /*ARGSUSED*/
126 enum auth_stat
__svcauth_short(struct svc_req * rqst,struct rpc_msg * msg)127 __svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
128 {
129 return (AUTH_REJECTEDCRED);
130 }
131
132 /*
133 * Unix longhand authenticator. Will be obsoleted
134 */
135 enum auth_stat
__svcauth_unix(struct svc_req * rqst,struct rpc_msg * msg)136 __svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
137 {
138 return (__svcauth_sys(rqst, msg));
139 }
140