1/*
2 * svc_auth.c, Server-side rpc authenticator interface.
3 *
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <rpc/rpc.h>
35#include <rpc/svc.h>
36#include <rpc/svc_auth.h>
37#include <shlib-compat.h>
38
39/*
40 * svcauthsw is the bdevsw of server side authentication.
41 *
42 * Server side authenticators are called from authenticate by
43 * using the client auth struct flavor field to index into svcauthsw.
44 * The server auth flavors must implement a routine that looks
45 * like:
46 *
47 * enum auth_stat
48 * flavorx_auth(rqst, msg)
49 * register struct svc_req *rqst;
50 * register struct rpc_msg *msg;
51 *
52 */
53
54static enum auth_stat _svcauth_null (struct svc_req *, struct rpc_msg *);
55 /* no authentication */
56extern enum auth_stat _svcauth_unix (struct svc_req *, struct rpc_msg *);
57 /* unix style (uid, gids) */
58extern enum auth_stat _svcauth_short (struct svc_req *, struct rpc_msg *);
59 /* short hand unix style */
60extern enum auth_stat _svcauth_des (struct svc_req *, struct rpc_msg *);
61 /* des style */
62
63static const struct
64 {
65 enum auth_stat (*authenticator) (struct svc_req *, struct rpc_msg *);
66 }
67svcauthsw[] =
68{
69 { _svcauth_null }, /* AUTH_NULL */
70 { _svcauth_unix }, /* AUTH_UNIX */
71 { _svcauth_short }, /* AUTH_SHORT */
72 { _svcauth_des } /* AUTH_DES */
73};
74#define AUTH_MAX 3 /* HIGHEST AUTH NUMBER */
75
76
77/*
78 * The call rpc message, msg has been obtained from the wire. The msg contains
79 * the raw form of credentials and verifiers. authenticate returns AUTH_OK
80 * if the msg is successfully authenticated. If AUTH_OK then the routine also
81 * does the following things:
82 * set rqst->rq_xprt->verf to the appropriate response verifier;
83 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
84 *
85 * NB: rqst->rq_cxprt->verf must be pre-allocated;
86 * its length is set appropriately.
87 *
88 * The caller still owns and is responsible for msg->u.cmb.cred and
89 * msg->u.cmb.verf. The authentication system retains ownership of
90 * rqst->rq_client_cred, the cooked credentials.
91 *
92 * There is an assumption that any flavour less than AUTH_NULL is
93 * invalid.
94 */
95enum auth_stat
96_authenticate (register struct svc_req *rqst, struct rpc_msg *msg)
97{
98 register int cred_flavor;
99
100 rqst->rq_cred = msg->rm_call.cb_cred;
101 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor;
102 rqst->rq_xprt->xp_verf.oa_length = 0;
103 cred_flavor = rqst->rq_cred.oa_flavor;
104 if ((cred_flavor <= AUTH_MAX) && (cred_flavor >= AUTH_NULL))
105 return (*(svcauthsw[cred_flavor].authenticator)) (rqst, msg);
106
107 return AUTH_REJECTEDCRED;
108}
109libc_hidden_nolink_sunrpc (_authenticate, GLIBC_2_1)
110
111static enum auth_stat
112_svcauth_null (struct svc_req *rqst, struct rpc_msg *msg)
113{
114 return AUTH_OK;
115}
116