FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_auth.c
1 /* $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, 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 "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32 /*
33 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI"
38 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
39 #endif
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 /*
44 * svc_auth.c, Server-side rpc authenticator interface.
45 *
46 */
47
48 #include <sys/param.h>
49 #include <sys/lock.h>
50 #include <sys/mutex.h>
51 #include <sys/systm.h>
52 #include <sys/jail.h>
53 #include <sys/ucred.h>
54
55 #include <rpc/rpc.h>
56
57 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
58 struct rpc_msg *) = NULL;
59 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
60 struct ucred **, int *);
61
62 static struct svc_auth_ops svc_auth_null_ops;
63
64 /*
65 * The call rpc message, msg has been obtained from the wire. The msg contains
66 * the raw form of credentials and verifiers. authenticate returns AUTH_OK
67 * if the msg is successfully authenticated. If AUTH_OK then the routine also
68 * does the following things:
69 * set rqst->rq_xprt->verf to the appropriate response verifier;
70 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
71 *
72 * NB: rqst->rq_cxprt->verf must be pre-allocated;
73 * its length is set appropriately.
74 *
75 * The caller still owns and is responsible for msg->u.cmb.cred and
76 * msg->u.cmb.verf. The authentication system retains ownership of
77 * rqst->rq_client_cred, the cooked credentials.
78 *
79 * There is an assumption that any flavour less than AUTH_NULL is
80 * invalid.
81 */
82 enum auth_stat
83 _authenticate(struct svc_req *rqst, struct rpc_msg *msg)
84 {
85 int cred_flavor;
86 enum auth_stat dummy;
87
88 rqst->rq_cred = msg->rm_call.cb_cred;
89 rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
90 rqst->rq_auth.svc_ah_private = NULL;
91 cred_flavor = rqst->rq_cred.oa_flavor;
92 switch (cred_flavor) {
93 case AUTH_NULL:
94 dummy = _svcauth_null(rqst, msg);
95 return (dummy);
96 case AUTH_SYS:
97 dummy = _svcauth_unix(rqst, msg);
98 return (dummy);
99 case AUTH_SHORT:
100 dummy = _svcauth_short(rqst, msg);
101 return (dummy);
102 case RPCSEC_GSS:
103 if (!_svcauth_rpcsec_gss)
104 return (AUTH_REJECTEDCRED);
105 dummy = _svcauth_rpcsec_gss(rqst, msg);
106 return (dummy);
107 default:
108 break;
109 }
110
111 return (AUTH_REJECTEDCRED);
112 }
113
114 /*
115 * A set of null auth methods used by any authentication protocols
116 * that don't need to inspect or modify the message body.
117 */
118 static bool_t
119 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
120 {
121
122 return (TRUE);
123 }
124
125 static bool_t
126 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
127 {
128
129 return (TRUE);
130 }
131
132 static void
133 svcauth_null_release(SVCAUTH *auth)
134 {
135
136 }
137
138 static struct svc_auth_ops svc_auth_null_ops = {
139 svcauth_null_wrap,
140 svcauth_null_unwrap,
141 svcauth_null_release,
142 };
143
144 /*ARGSUSED*/
145 enum auth_stat
146 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
147 {
148
149 rqst->rq_verf = _null_auth;
150 return (AUTH_OK);
151 }
152
153 int
154 svc_auth_reg(int flavor,
155 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
156 int (*getcred)(struct svc_req *, struct ucred **, int *))
157 {
158
159 if (flavor == RPCSEC_GSS) {
160 _svcauth_rpcsec_gss = svcauth;
161 _svcauth_rpcsec_gss_getcred = getcred;
162 }
163 return (TRUE);
164 }
165
166 int
167 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
168 {
169 struct ucred *cr = NULL;
170 int flavor;
171 struct xucred *xcr;
172
173 flavor = rqst->rq_cred.oa_flavor;
174 if (flavorp)
175 *flavorp = flavor;
176
177 switch (flavor) {
178 case AUTH_UNIX:
179 xcr = (struct xucred *) rqst->rq_clntcred;
180 cr = crget();
181 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
182 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
183 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
184 cr->cr_prison = &prison0;
185 prison_hold(cr->cr_prison);
186 *crp = cr;
187 return (TRUE);
188
189 case RPCSEC_GSS:
190 if (!_svcauth_rpcsec_gss_getcred)
191 return (FALSE);
192 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
193
194 default:
195 return (FALSE);
196 }
197 }
198
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