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 * Copyright 1989 Sun Microsystems, Inc. All rights reserved.
24 * Copyright 2017 Joyent Inc
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 /*
32 * Portions of this source code were derived from Berkeley 4.3 BSD
33 * under license from the Regents of the University of California.
34 */
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
45 #include <sys/param.h>
46 #include <sys/types.h>
47 #include <sys/time.h>
48 #include <sys/systm.h>
49 #include <sys/stream.h>
50 #include <sys/stropts.h>
51 #include <sys/strsubr.h>
52 #include <sys/tiuser.h>
53 #include <sys/tihdr.h>
54 #include <sys/t_kuser.h>
55 #include <sys/cmn_err.h>
56 #include <sys/debug.h>
57
58 #include <rpc/types.h>
59 #include <rpc/xdr.h>
60 #include <rpc/auth.h>
61 #include <rpc/clnt.h>
62 #include <rpc/rpc_msg.h>
63 #include <rpc/svc.h>
64 #include <rpc/auth_unix.h>
65 #include <rpc/svc_auth.h>
66
67
68 /*
69 * Unix longhand authenticator
70 */
71 enum auth_stat
_svcauth_unix(struct svc_req * rqst,struct rpc_msg * msg)72 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
73 {
74 struct authunix_parms *aup;
75 int32_t *buf;
76 struct area {
77 struct authunix_parms area_aup;
78 char area_machname[MAX_MACHINE_NAME+1];
79 gid_t area_gids[NGRPS];
80 } *area;
81 uint_t auth_len;
82 uint_t str_len, gid_len;
83 int i;
84
85 CTASSERT(sizeof (struct area) <= RQCRED_SIZE);
86 /* LINTED pointer alignment */
87 area = (struct area *)rqst->rq_clntcred;
88 aup = &area->area_aup;
89 aup->aup_machname = area->area_machname;
90 aup->aup_gids = area->area_gids;
91 auth_len = msg->rm_call.cb_cred.oa_length;
92 if (auth_len == 0)
93 return (AUTH_BADCRED);
94
95 /* LINTED pointer cast */
96 buf = (int32_t *)msg->rm_call.cb_cred.oa_base;
97
98 aup->aup_time = IXDR_GET_INT32(buf);
99 str_len = IXDR_GET_U_INT32(buf);
100 if (str_len > MAX_MACHINE_NAME)
101 return (AUTH_BADCRED);
102 bcopy((caddr_t)buf, aup->aup_machname, str_len);
103 aup->aup_machname[str_len] = 0;
104 str_len = RNDUP(str_len);
105 buf += str_len / sizeof (int32_t);
106 aup->aup_uid = IXDR_GET_INT32(buf);
107 aup->aup_gid = IXDR_GET_INT32(buf);
108 gid_len = IXDR_GET_U_INT32(buf);
109 if (gid_len > NGRPS)
110 return (AUTH_BADCRED);
111 aup->aup_len = gid_len;
112 for (i = 0; i < gid_len; i++) {
113 aup->aup_gids[i] = IXDR_GET_INT32(buf);
114 }
115 /*
116 * five is the smallest unix credentials structure -
117 * timestamp, hostname len (0), uid, gid, and gids len (0).
118 */
119 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
120 return (AUTH_BADCRED);
121
122 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
123 rqst->rq_xprt->xp_verf.oa_length = 0;
124
125 return (AUTH_OK);
126 }
127
128
129 /*
130 * Shorthand unix authenticator
131 * Looks up longhand in a cache.
132 */
133 /* ARGSUSED */
134 enum auth_stat
_svcauth_short(struct svc_req * rqst,struct rpc_msg * msg)135 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
136 {
137 return (AUTH_REJECTEDCRED);
138 }
139