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-alloctaed; 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 } 198 199