svc_auth.c revision 184588 
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 184588 2008-11-03 10:38:00Z dfr $");
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/ucred.h>
52
53#include <rpc/rpc.h>
54
55static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
56    struct rpc_msg *) = NULL;
57static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
58    struct ucred **, int *);
59
60static struct svc_auth_ops svc_auth_null_ops;
61
62/*
63 * The call rpc message, msg has been obtained from the wire.  The msg contains
64 * the raw form of credentials and verifiers.  authenticate returns AUTH_OK
65 * if the msg is successfully authenticated.  If AUTH_OK then the routine also
66 * does the following things:
67 * set rqst->rq_xprt->verf to the appropriate response verifier;
68 * sets rqst->rq_client_cred to the "cooked" form of the credentials.
69 *
70 * NB: rqst->rq_cxprt->verf must be pre-alloctaed;
71 * its length is set appropriately.
72 *
73 * The caller still owns and is responsible for msg->u.cmb.cred and
74 * msg->u.cmb.verf.  The authentication system retains ownership of
75 * rqst->rq_client_cred, the cooked credentials.
76 *
77 * There is an assumption that any flavour less than AUTH_NULL is
78 * invalid.
79 */
80enum auth_stat
81_authenticate(struct svc_req *rqst, struct rpc_msg *msg)
82{
83	int cred_flavor;
84	enum auth_stat dummy;
85
86	rqst->rq_cred = msg->rm_call.cb_cred;
87	rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops;
88	rqst->rq_auth.svc_ah_private = NULL;
89	cred_flavor = rqst->rq_cred.oa_flavor;
90	switch (cred_flavor) {
91	case AUTH_NULL:
92		dummy = _svcauth_null(rqst, msg);
93		return (dummy);
94	case AUTH_SYS:
95		dummy = _svcauth_unix(rqst, msg);
96		return (dummy);
97	case AUTH_SHORT:
98		dummy = _svcauth_short(rqst, msg);
99		return (dummy);
100	case RPCSEC_GSS:
101		if (!_svcauth_rpcsec_gss)
102			return (AUTH_REJECTEDCRED);
103		dummy = _svcauth_rpcsec_gss(rqst, msg);
104		return (dummy);
105	default:
106		break;
107	}
108
109	return (AUTH_REJECTEDCRED);
110}
111
112/*
113 * A set of null auth methods used by any authentication protocols
114 * that don't need to inspect or modify the message body.
115 */
116static bool_t
117svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
118{
119
120	return (TRUE);
121}
122
123static bool_t
124svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
125{
126
127	return (TRUE);
128}
129
130static void
131svcauth_null_release(SVCAUTH *auth)
132{
133
134}
135
136static struct svc_auth_ops svc_auth_null_ops = {
137	svcauth_null_wrap,
138	svcauth_null_unwrap,
139	svcauth_null_release,
140};
141
142/*ARGSUSED*/
143enum auth_stat
144_svcauth_null(struct svc_req *rqst, struct rpc_msg *msg)
145{
146
147	rqst->rq_verf = _null_auth;
148	return (AUTH_OK);
149}
150
151int
152svc_auth_reg(int flavor,
153    enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *),
154    int (*getcred)(struct svc_req *, struct ucred **, int *))
155{
156
157	if (flavor == RPCSEC_GSS) {
158		_svcauth_rpcsec_gss = svcauth;
159		_svcauth_rpcsec_gss_getcred = getcred;
160	}
161	return (TRUE);
162}
163
164int
165svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
166{
167	struct ucred *cr = NULL;
168	int flavor, i;
169	struct xucred *xcr;
170
171	flavor = rqst->rq_cred.oa_flavor;
172	if (flavorp)
173		*flavorp = flavor;
174
175	switch (flavor) {
176	case AUTH_UNIX:
177		xcr = (struct xucred *) rqst->rq_clntcred;
178		cr = crget();
179		cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid;
180		cr->cr_ngroups = xcr->cr_ngroups;
181		for (i = 0; i < xcr->cr_ngroups; i++)
182			cr->cr_groups[i] = xcr->cr_groups[i];
183		cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
184		*crp = cr;
185		return (TRUE);
186
187	case RPCSEC_GSS:
188		if (!_svcauth_rpcsec_gss_getcred)
189			return (FALSE);
190		return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
191
192	default:
193		return (FALSE);
194	}
195}
196
197