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 #include <sys/cdefs.h>
32 /*
33 * auth_none.c
34 * Creates a client authentication handle for passing "null"
35 * credentials and verifiers to remote systems.
36 *
37 * Copyright (C) 1984, Sun Microsystems, Inc.
38 */
39
40 /*
41 * Modified from auth_none.c to expect a reply verifier of "STARTTLS"
42 * for the RPC-over-TLS STARTTLS command.
43 */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/lock.h>
49 #include <sys/malloc.h>
50 #include <sys/mutex.h>
51
52 #include <rpc/types.h>
53 #include <rpc/xdr.h>
54 #include <rpc/auth.h>
55 #include <rpc/clnt.h>
56 #include <rpc/rpcsec_tls.h>
57
58 #define MAX_MARSHAL_SIZE 20
59
60 /*
61 * Authenticator operations routines
62 */
63
64 static bool_t authtls_marshal (AUTH *, uint32_t, XDR *, struct mbuf *);
65 static void authtls_verf (AUTH *);
66 static bool_t authtls_validate (AUTH *, uint32_t, struct opaque_auth *,
67 struct mbuf **);
68 static bool_t authtls_refresh (AUTH *, void *);
69 static void authtls_destroy (AUTH *);
70
71 static const struct auth_ops authtls_ops = {
72 .ah_nextverf = authtls_verf,
73 .ah_marshal = authtls_marshal,
74 .ah_validate = authtls_validate,
75 .ah_refresh = authtls_refresh,
76 .ah_destroy = authtls_destroy,
77 };
78
79 struct authtls_private {
80 AUTH no_client;
81 char mclient[MAX_MARSHAL_SIZE];
82 u_int mcnt;
83 };
84
85 static struct authtls_private authtls_private;
86 static struct opaque_auth _tls_null_auth;
87
88 static void
authtls_init(void * dummy)89 authtls_init(void *dummy)
90 {
91 struct authtls_private *ap = &authtls_private;
92 XDR xdrs;
93
94 _tls_null_auth.oa_flavor = AUTH_TLS;
95 _tls_null_auth.oa_base = NULL;
96 _tls_null_auth.oa_length = 0;
97 ap->no_client.ah_cred = _tls_null_auth;
98 ap->no_client.ah_verf = _null_auth;
99 ap->no_client.ah_ops = &authtls_ops;
100 xdrmem_create(&xdrs, ap->mclient, MAX_MARSHAL_SIZE, XDR_ENCODE);
101 xdr_opaque_auth(&xdrs, &ap->no_client.ah_cred);
102 xdr_opaque_auth(&xdrs, &ap->no_client.ah_verf);
103 ap->mcnt = XDR_GETPOS(&xdrs);
104 XDR_DESTROY(&xdrs);
105 }
106 SYSINIT(authtls_init, SI_SUB_KMEM, SI_ORDER_ANY, authtls_init, NULL);
107
108 AUTH *
authtls_create(void)109 authtls_create(void)
110 {
111 struct authtls_private *ap = &authtls_private;
112
113 return (&ap->no_client);
114 }
115
116 /*ARGSUSED*/
117 static bool_t
authtls_marshal(AUTH * client,uint32_t xid,XDR * xdrs,struct mbuf * args)118 authtls_marshal(AUTH *client, uint32_t xid, XDR *xdrs, struct mbuf *args)
119 {
120 struct authtls_private *ap = &authtls_private;
121
122 KASSERT(xdrs != NULL, ("authtls_marshal: xdrs is null"));
123
124 if (!XDR_PUTBYTES(xdrs, ap->mclient, ap->mcnt))
125 return (FALSE);
126
127 xdrmbuf_append(xdrs, args);
128
129 return (TRUE);
130 }
131
132 /* All these unused parameters are required to keep ANSI-C from grumbling */
133 /*ARGSUSED*/
134 static void
authtls_verf(AUTH * client)135 authtls_verf(AUTH *client)
136 {
137 }
138
139 /*ARGSUSED*/
140 static bool_t
authtls_validate(AUTH * client,uint32_t xid,struct opaque_auth * opaque,struct mbuf ** mrepp)141 authtls_validate(AUTH *client, uint32_t xid, struct opaque_auth *opaque,
142 struct mbuf **mrepp)
143 {
144 size_t strsiz;
145
146 strsiz = strlen(RPCTLS_START_STRING);
147 /* The verifier must be the string RPCTLS_START_STRING. */
148 if (opaque != NULL &&
149 (opaque->oa_length != strsiz || memcmp(opaque->oa_base,
150 RPCTLS_START_STRING, strsiz) != 0))
151 return (FALSE);
152 return (TRUE);
153 }
154
155 /*ARGSUSED*/
156 static bool_t
authtls_refresh(AUTH * client,void * dummy)157 authtls_refresh(AUTH *client, void *dummy)
158 {
159
160 return (FALSE);
161 }
162
163 /*ARGSUSED*/
164 static void
authtls_destroy(AUTH * client)165 authtls_destroy(AUTH *client)
166 {
167 }
168