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 * 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"
37 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro";
38 #endif
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: releng/9.2/sys/rpc/svc_auth.c 194498 2009-06-19 17:10:35Z brooks $");
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
56 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *,
57 struct rpc_msg *) = NULL;
58 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *,
59 struct ucred **, int *);
60
61 static 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 */
81 enum 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 */
117 static bool_t
118 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp)
119 {
120
121 return (TRUE);
122 }
123
124 static bool_t
125 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp)
126 {
127
128 return (TRUE);
129 }
130
131 static void
132 svcauth_null_release(SVCAUTH *auth)
133 {
134
135 }
136
137 static struct svc_auth_ops svc_auth_null_ops = {
138 svcauth_null_wrap,
139 svcauth_null_unwrap,
140 svcauth_null_release,
141 };
142
143 /*ARGSUSED*/
144 enum 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
152 int
153 svc_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
165 int
166 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp)
167 {
168 struct ucred *cr = NULL;
169 int flavor;
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 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups);
182 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0];
183 cr->cr_prison = &prison0;
184 prison_hold(cr->cr_prison);
185 *crp = cr;
186 return (TRUE);
187
188 case RPCSEC_GSS:
189 if (!_svcauth_rpcsec_gss_getcred)
190 return (FALSE);
191 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp));
192
193 default:
194 return (FALSE);
195 }
196 }
197
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