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 /*
30 * Handles the loopback UNIX flavor authentication parameters on the
31 * service side of rpc.
32 */
33
34 #include "mt.h"
35 #include <stdio.h>
36 #include <rpc/rpc.h>
37 #include <syslog.h>
38 #include <sys/types.h>
39 #include <sys/debug.h>
40
41 /*
42 * NOTE: this has to fit inside RQCRED_SIZE bytes. If you update this struct,
43 * double-check it still fits.
44 */
45 struct authlpbk_area {
46 struct authsys_parms area_aup;
47 char area_machname[MAX_MACHINE_NAME+1];
48 gid_t area_gids[NGRPS_LOOPBACK];
49 };
50 CTASSERT(sizeof (struct authlpbk_area) <= RQCRED_SIZE);
51
52 /*
53 * Loopback system (Unix) longhand authenticator
54 */
55 enum auth_stat
__svcauth_loopback(struct svc_req * rqst,struct rpc_msg * msg)56 __svcauth_loopback(struct svc_req *rqst, struct rpc_msg *msg)
57 {
58 struct authsys_parms *aup;
59 int32_t *buf;
60 struct authlpbk_area *area;
61 uint_t auth_len;
62 uint_t str_len, gid_len;
63 int i;
64
65 /* LINTED pointer cast */
66 area = (struct authlpbk_area *)rqst->rq_clntcred;
67 aup = &area->area_aup;
68 aup->aup_machname = area->area_machname;
69 aup->aup_gids = area->area_gids;
70 auth_len = msg->rm_call.cb_cred.oa_length;
71 if (auth_len == 0)
72 return (AUTH_BADCRED);
73
74 /* LINTED pointer cast */
75 buf = (int32_t *)msg->rm_call.cb_cred.oa_base;
76
77 aup->aup_time = IXDR_GET_INT32(buf);
78 str_len = IXDR_GET_U_INT32(buf);
79 if (str_len > MAX_MACHINE_NAME)
80 return (AUTH_BADCRED);
81 if (str_len > auth_len)
82 return (AUTH_BADCRED);
83 (void) memcpy(aup->aup_machname, buf, str_len);
84 aup->aup_machname[str_len] = 0;
85 str_len = RNDUP(str_len);
86 buf += str_len / sizeof (int);
87 aup->aup_uid = IXDR_GET_INT32(buf);
88 aup->aup_gid = IXDR_GET_INT32(buf);
89 gid_len = IXDR_GET_U_INT32(buf);
90 if (gid_len > NGRPS_LOOPBACK)
91 return (AUTH_BADCRED);
92 /*
93 * five is the smallest unix credentials structure -
94 * timestamp, hostname len (0), uid, gid, and gids len (0).
95 */
96 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
97 return (AUTH_BADCRED);
98
99 aup->aup_len = gid_len;
100 for (i = 0; i < gid_len; i++) {
101 aup->aup_gids[i] = (gid_t)IXDR_GET_INT32(buf);
102 }
103
104 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
105 rqst->rq_xprt->xp_verf.oa_length = 0;
106
107 return (AUTH_OK);
108 }
109