svc_auth.c revision 193650 
1/*	$NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31/*
32 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33 */
34
35#if defined(LIBC_SCCS) && !defined(lint)
36#ident	"@(#)svc_auth.c	1.16	94/04/24 SMI"
37static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/rpc/svc_auth.c 193650 2009-06-07 20:51:31Z rwatson $");
41
42/*
43 * svc_auth.c, Server-side rpc authenticator interface.
44 *
45 */
46
47#include <sys/param.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/systm.h>
51#include <sys/jail.h>
52#include <sys/ucred.h>
53
54#include <rpc/rpc.h>
55
56static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
57    struct rpc_msg *) = NULL;
58static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
59    struct ucred **, int *);
60
61static struct svc_auth_ops svc_auth_null_ops;
62
63/*
64 * The call rpc message, msg has been obtained from the wire.  The msg contains
65 * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
66 * if the msg is successfully authenticated.  If AUTH_OK then the routine also
67 * does the following things:
68 * set rqst->rq_xprt->verf to the appropriate response verifier;
69 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
70 *
71 * NB: rqst->rq_cxprt->verf must be pre-alloctaed;
72 * its length is set appropriately.
73 *
74 * The caller still owns and is responsible for msg->u.cmb.cred and
75 * msg->u.cmb.verf.  The authentication system retains ownership of
76 * rqst->rq_client_cred, the cooked credentials.
77 *
78 * There is an assumption that any flavour less than AUTH_NULL is
79 * invalid.
80 */
81enum auth_stat
82_authenticate(struct svc_req *rqst, struct rpc_msg *msg)
83{
84	int cred_flavor;
85	enum auth_stat dummy;
86
87	rqst->rq_cred = msg->rm_call.cb_cred;
88	rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
89	rqst->rq_auth.svc_ah_private = NULL;
90	cred_flavor = rqst->rq_cred.oa_flavor;
91	switch (cred_flavor) {
92	case AUTH_NULL:
93		dummy = _svcauth_null(rqst, msg);
94		return (dummy);
95	case AUTH_SYS:
96		dummy = _svcauth_unix(rqst, msg);
97		return (dummy);
98	case AUTH_SHORT:
99		dummy = _svcauth_short(rqst, msg);
100		return (dummy);
101	case RPCSEC_GSS:
102		if (!_svcauth_rpcsec_gss)
103			return (AUTH_REJECTEDCRED);
104		dummy = _svcauth_rpcsec_gss(rqst, msg);
105		return (dummy);
106	default:
107		break;
108	}
109
110	return (AUTH_REJECTEDCRED);
111}
112
113/*
114 * A set of null auth methods used by any authentication protocols
115 * that don't need to inspect or modify the message body.
116 */
117static bool_t
118svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
119{
120
121	return (TRUE);
122}
123
124static bool_t
125svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
126{
127
128	return (TRUE);
129}
130
131static void
132svcauth_null_release(SVCAUTH *auth)
133{
134
135}
136
137static struct svc_auth_ops svc_auth_null_ops = {
138	svcauth_null_wrap,
139	svcauth_null_unwrap,
140	svcauth_null_release,
141};
142
143/*ARGSUSED*/
144enum auth_stat
145_svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
146{
147
148	rqst->rq_verf = _null_auth;
149	return (AUTH_OK);
150}
151
152int
153svc_auth_reg(int flavor,
154    enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
155    int (*getcred)(struct svc_req *, struct ucred **, int *))
156{
157
158	if (flavor == RPCSEC_GSS) {
159		_svcauth_rpcsec_gss = svcauth;
160		_svcauth_rpcsec_gss_getcred = getcred;
161	}
162	return (TRUE);
163}
164
165int
166svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
167{
168	struct ucred *cr = NULL;
169	int flavor, i;
170	struct xucred *xcr;
171
172	flavor = rqst->rq_cred.oa_flavor;
173	if (flavorp)
174		*flavorp = flavor;
175
176	switch (flavor) {
177	case AUTH_UNIX:
178		xcr = (struct xucred *) rqst->rq_clntcred;
179		cr = crget();
180		cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
181		cr->cr_ngroups = xcr->cr_ngroups;
182		for (i = 0; i < xcr->cr_ngroups; i++)
183			cr->cr_groups[i] = xcr->cr_groups[i];
184		cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
185		cr->cr_prison = &prison0;
186		prison_hold(cr->cr_prison);
187		*crp = cr;
188		return (TRUE);
189
190	case RPCSEC_GSS:
191		if (!_svcauth_rpcsec_gss_getcred)
192			return (FALSE);
193		return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
194
195	default:
196		return (FALSE);
197	}
198}
199
200