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 "namespace.h" 49 #include "reentrant.h" 50 #include <sys/types.h> 51 #include <rpc/rpc.h> 52 #include <stdlib.h> 53 #include "un-namespace.h" 54 #include "mt_misc.h" 55 56 /* 57 * svcauthsw is the bdevsw of server side authentication. 58 * 59 * Server side authenticators are called from authenticate by 60 * using the client auth struct flavor field to index into svcauthsw. 61 * The server auth flavors must implement a routine that looks 62 * like: 63 * 64 * enum auth_stat 65 * flavorx_auth(rqst, msg) 66 * struct svc_req *rqst; 67 * struct rpc_msg *msg; 68 * 69 */ 70 71 /* declarations to allow servers to specify new authentication flavors */ 72 struct authsvc { 73 int flavor; 74 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 75 struct authsvc *next; 76 }; 77 static struct authsvc *Auths = NULL; 78 79 struct svc_auth_ops svc_auth_null_ops; 80 81 /* 82 * The call rpc message, msg has been obtained from the wire. The msg contains 83 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 84 * if the msg is successfully authenticated. If AUTH_OK then the routine also 85 * does the following things: 86 * set rqst->rq_xprt->verf to the appropriate response verifier; 87 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 88 * 89 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 90 * its length is set appropriately. 91 * 92 * The caller still owns and is responsible for msg->u.cmb.cred and 93 * msg->u.cmb.verf. The authentication system retains ownership of 94 * rqst->rq_client_cred, the cooked credentials. 95 * 96 * There is an assumption that any flavour less than AUTH_NULL is 97 * invalid. 98 */ 99 enum auth_stat 100 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 101 { 102 int cred_flavor; 103 struct authsvc *asp; 104 enum auth_stat dummy; 105 106 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 107 108 rqst->rq_cred = msg->rm_call.cb_cred; 109 SVC_AUTH(rqst->rq_xprt).svc_ah_ops = &svc_auth_null_ops; 110 SVC_AUTH(rqst->rq_xprt).svc_ah_private = NULL; 111 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 112 rqst->rq_xprt->xp_verf.oa_length = 0; 113 cred_flavor = rqst->rq_cred.oa_flavor; 114 switch (cred_flavor) { 115 case AUTH_NULL: 116 dummy = _svcauth_null(rqst, msg); 117 return (dummy); 118 case AUTH_SYS: 119 dummy = _svcauth_unix(rqst, msg); 120 return (dummy); 121 case AUTH_SHORT: 122 dummy = _svcauth_short(rqst, msg); 123 return (dummy); 124 #ifdef DES_BUILTIN 125 case AUTH_DES: 126 dummy = _svcauth_des(rqst, msg); 127 return (dummy); 128 #endif 129 default: 130 break; 131 } 132 133 /* flavor doesn't match any of the builtin types, so try new ones */ 134 mutex_lock(&authsvc_lock); 135 for (asp = Auths; asp; asp = asp->next) { 136 if (asp->flavor == cred_flavor) { 137 enum auth_stat as; 138 139 as = (*asp->handler)(rqst, msg); 140 mutex_unlock(&authsvc_lock); 141 return (as); 142 } 143 } 144 mutex_unlock(&authsvc_lock); 145 146 return (AUTH_REJECTEDCRED); 147 } 148 149 /* 150 * A set of null auth methods used by any authentication protocols 151 * that don't need to inspect or modify the message body. 152 */ 153 static bool_t 154 svcauth_null_wrap(SVCAUTH *auth, XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr) 155 { 156 157 return (xdr_func(xdrs, xdr_ptr)); 158 } 159 160 struct svc_auth_ops svc_auth_null_ops = { 161 svcauth_null_wrap, 162 svcauth_null_wrap, 163 }; 164 165 /*ARGSUSED*/ 166 enum auth_stat 167 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 168 { 169 return (AUTH_OK); 170 } 171 172 /* 173 * Allow the rpc service to register new authentication types that it is 174 * prepared to handle. When an authentication flavor is registered, 175 * the flavor is checked against already registered values. If not 176 * registered, then a new Auths entry is added on the list. 177 * 178 * There is no provision to delete a registration once registered. 179 * 180 * This routine returns: 181 * 0 if registration successful 182 * 1 if flavor already registered 183 * -1 if can't register (errno set) 184 */ 185 186 int 187 svc_auth_reg(int cred_flavor, 188 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *)) 189 { 190 struct authsvc *asp; 191 192 switch (cred_flavor) { 193 case AUTH_NULL: 194 case AUTH_SYS: 195 case AUTH_SHORT: 196 #ifdef DES_BUILTIN 197 case AUTH_DES: 198 #endif 199 /* already registered */ 200 return (1); 201 202 default: 203 mutex_lock(&authsvc_lock); 204 for (asp = Auths; asp; asp = asp->next) { 205 if (asp->flavor == cred_flavor) { 206 /* already registered */ 207 mutex_unlock(&authsvc_lock); 208 return (1); 209 } 210 } 211 212 /* this is a new one, so go ahead and register it */ 213 asp = mem_alloc(sizeof (*asp)); 214 if (asp == NULL) { 215 mutex_unlock(&authsvc_lock); 216 return (-1); 217 } 218 asp->flavor = cred_flavor; 219 asp->handler = handler; 220 asp->next = Auths; 221 Auths = asp; 222 mutex_unlock(&authsvc_lock); 223 break; 224 } 225 return (0); 226 } 227