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/proc.h>
52 #include <sys/systm.h>
53 #include <sys/jail.h>
54 #include <sys/ucred.h>
55
56 #include <rpc/rpc.h>
57 #include <rpc/rpcsec_tls.h>
58
59 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
60 struct rpc_msg *) = NULL;
61 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
62 struct ucred **, int *);
63
64 static const struct svc_auth_ops svc_auth_null_ops;
65
66 /*
67 * The call rpc message, msg has been obtained from the wire. The msg contains
68 * the raw form of credentials and verifiers. authenticate returns AUTH_OK
69 * if the msg is successfully authenticated. If AUTH_OK then the routine also
70 * does the following things:
71 * set rqst->rq_xprt->verf to the appropriate response verifier;
72 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
73 *
74 * NB: rqst->rq_cxprt->verf must be pre-allocated;
75 * its length is set appropriately.
76 *
77 * The caller still owns and is responsible for msg->u.cmb.cred and
78 * msg->u.cmb.verf. The authentication system retains ownership of
79 * rqst->rq_client_cred, the cooked credentials.
80 *
81 * There is an assumption that any flavour less than AUTH_NULL is
82 * invalid.
83 */
84 enum auth_stat
85 _authenticate(struct svc_req *rqst, struct rpc_msg *msg)
86 {
87 int cred_flavor;
88 enum auth_stat dummy;
89
90 rqst->rq_cred = msg->rm_call.cb_cred;
91 rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
92 rqst->rq_auth.svc_ah_private = NULL;
93 cred_flavor = rqst->rq_cred.oa_flavor;
94 switch (cred_flavor) {
95 case AUTH_NULL:
96 dummy = _svcauth_null(rqst, msg);
97 return (dummy);
98 case AUTH_SYS:
99 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
100 return (AUTH_REJECTEDCRED);
101 dummy = _svcauth_unix(rqst, msg);
102 return (dummy);
103 case AUTH_SHORT:
104 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
105 return (AUTH_REJECTEDCRED);
106 dummy = _svcauth_short(rqst, msg);
107 return (dummy);
108 case RPCSEC_GSS:
109 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0)
110 return (AUTH_REJECTEDCRED);
111 if (!_svcauth_rpcsec_gss)
112 return (AUTH_REJECTEDCRED);
113 dummy = _svcauth_rpcsec_gss(rqst, msg);
114 return (dummy);
115 case AUTH_TLS:
116 dummy = _svcauth_rpcsec_tls(rqst, msg);
117 return (dummy);
118 default:
119 break;
120 }
121
122 return (AUTH_REJECTEDCRED);
123 }
124
125 /*
126 * A set of null auth methods used by any authentication protocols
127 * that don't need to inspect or modify the message body.
128 */
129 static bool_t
130 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
131 {
132
133 return (TRUE);
134 }
135
136 static bool_t
137 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
138 {
139
140 return (TRUE);
141 }
142
143 static void
144 svcauth_null_release(SVCAUTH *auth)
145 {
146
147 }
148
149 static const struct svc_auth_ops svc_auth_null_ops = {
150 .svc_ah_wrap = svcauth_null_wrap,
151 .svc_ah_unwrap = svcauth_null_unwrap,
152 .svc_ah_release = svcauth_null_release,
153 };
154
155 /*ARGSUSED*/
156 enum auth_stat
157 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
158 {
159
160 rqst->rq_verf = _null_auth;
161 return (AUTH_OK);
162 }
163
164 int
165 svc_auth_reg(int flavor,
166 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
167 int (*getcred)(struct svc_req *, struct ucred **, int *))
168 {
169
170 if (flavor == RPCSEC_GSS) {
171 _svcauth_rpcsec_gss = svcauth;
172 _svcauth_rpcsec_gss_getcred = getcred;
173 }
174 return (TRUE);
175 }
176
177 int
178 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
179 {
180 struct ucred *cr = NULL;
181 int flavor;
182 struct xucred *xcr;
183 SVCXPRT *xprt = rqst->rq_xprt;
184
185 flavor = rqst->rq_cred.oa_flavor;
186 if (flavorp)
187 *flavorp = flavor;
188
189 /*
190 * If there are credentials acquired via a TLS
191 * certificate for this TCP connection, use those
192 * instead of what is in the RPC header.
193 */
194 if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER |
195 RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER &&
196 flavor == AUTH_UNIX) {
197 cr = crget();
198 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid;
199 crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp);
200 cr->cr_rgid = cr->cr_svgid = xprt->xp_gidp[0];
201 #ifdef VNET_NFSD
202 if (jailed(curthread->td_ucred))
203 cr->cr_prison = curthread->td_ucred->cr_prison;
204 else
205 #endif
206 cr->cr_prison = &prison0;
207 prison_hold(cr->cr_prison);
208 *crp = cr;
209 return (TRUE);
210 }
211
212 switch (flavor) {
213 case AUTH_UNIX:
214 xcr = (struct xucred *) rqst->rq_clntcred;
215 cr = crget();
216 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
217 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
218 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
219 #ifdef VNET_NFSD
220 if (jailed(curthread->td_ucred))
221 cr->cr_prison = curthread->td_ucred->cr_prison;
222 else
223 #endif
224 cr->cr_prison = &prison0;
225 prison_hold(cr->cr_prison);
226 *crp = cr;
227 return (TRUE);
228
229 case RPCSEC_GSS:
230 if (!_svcauth_rpcsec_gss_getcred)
231 return (FALSE);
232 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
233
234 default:
235 return (FALSE);
236 }
237 }
238
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