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("$FreeBSD$"); 41 42 /* 43 * svc_auth.c, Server-side rpc authenticator interface. 44 * 45 */ 46 47 #include "namespace.h" 48 #include "reentrant.h" 49 #include <sys/types.h> 50 #include <rpc/rpc.h> 51 #include <stdlib.h> 52 #include "un-namespace.h" 53 #include "mt_misc.h" 54 55 /* 56 * svcauthsw is the bdevsw of server side authentication. 57 * 58 * Server side authenticators are called from authenticate by 59 * using the client auth struct flavor field to index into svcauthsw. 60 * The server auth flavors must implement a routine that looks 61 * like: 62 * 63 * enum auth_stat 64 * flavorx_auth(rqst, msg) 65 * struct svc_req *rqst; 66 * struct rpc_msg *msg; 67 * 68 */ 69 70 /* declarations to allow servers to specify new authentication flavors */ 71 struct authsvc { 72 int flavor; 73 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 74 struct authsvc *next; 75 }; 76 static struct authsvc *Auths = NULL; 77 78 struct svc_auth_ops svc_auth_null_ops; 79 80 /* 81 * The call rpc message, msg has been obtained from the wire. The msg contains 82 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 83 * if the msg is successfully authenticated. If AUTH_OK then the routine also 84 * does the following things: 85 * set rqst->rq_xprt->verf to the appropriate response verifier; 86 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 87 * 88 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 89 * its length is set appropriately. 90 * 91 * The caller still owns and is responsible for msg->u.cmb.cred and 92 * msg->u.cmb.verf. The authentication system retains ownership of 93 * rqst->rq_client_cred, the cooked credentials. 94 * 95 * There is an assumption that any flavour less than AUTH_NULL is 96 * invalid. 97 */ 98 enum auth_stat 99 _authenticate(rqst, msg) 100 struct svc_req *rqst; 101 struct rpc_msg *msg; 102 { 103 int cred_flavor; 104 struct authsvc *asp; 105 enum auth_stat dummy; 106 107 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 108 109 rqst->rq_cred = msg->rm_call.cb_cred; 110 SVC_AUTH(rqst->rq_xprt).svc_ah_ops = &svc_auth_null_ops; 111 SVC_AUTH(rqst->rq_xprt).svc_ah_private = NULL; 112 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 113 rqst->rq_xprt->xp_verf.oa_length = 0; 114 cred_flavor = rqst->rq_cred.oa_flavor; 115 switch (cred_flavor) { 116 case AUTH_NULL: 117 dummy = _svcauth_null(rqst, msg); 118 return (dummy); 119 case AUTH_SYS: 120 dummy = _svcauth_unix(rqst, msg); 121 return (dummy); 122 case AUTH_SHORT: 123 dummy = _svcauth_short(rqst, msg); 124 return (dummy); 125 #ifdef DES_BUILTIN 126 case AUTH_DES: 127 dummy = _svcauth_des(rqst, msg); 128 return (dummy); 129 #endif 130 default: 131 break; 132 } 133 134 /* flavor doesn't match any of the builtin types, so try new ones */ 135 mutex_lock(&authsvc_lock); 136 for (asp = Auths; asp; asp = asp->next) { 137 if (asp->flavor == cred_flavor) { 138 enum auth_stat as; 139 140 as = (*asp->handler)(rqst, msg); 141 mutex_unlock(&authsvc_lock); 142 return (as); 143 } 144 } 145 mutex_unlock(&authsvc_lock); 146 147 return (AUTH_REJECTEDCRED); 148 } 149 150 /* 151 * A set of null auth methods used by any authentication protocols 152 * that don't need to inspect or modify the message body. 153 */ 154 static bool_t 155 svcauth_null_wrap(auth, xdrs, xdr_func, xdr_ptr) 156 SVCAUTH *auth; 157 XDR *xdrs; 158 xdrproc_t xdr_func; 159 caddr_t xdr_ptr; 160 { 161 162 return (xdr_func(xdrs, xdr_ptr)); 163 } 164 165 struct svc_auth_ops svc_auth_null_ops = { 166 svcauth_null_wrap, 167 svcauth_null_wrap, 168 }; 169 170 /*ARGSUSED*/ 171 enum auth_stat 172 _svcauth_null(rqst, msg) 173 struct svc_req *rqst; 174 struct rpc_msg *msg; 175 { 176 return (AUTH_OK); 177 } 178 179 /* 180 * Allow the rpc service to register new authentication types that it is 181 * prepared to handle. When an authentication flavor is registered, 182 * the flavor is checked against already registered values. If not 183 * registered, then a new Auths entry is added on the list. 184 * 185 * There is no provision to delete a registration once registered. 186 * 187 * This routine returns: 188 * 0 if registration successful 189 * 1 if flavor already registered 190 * -1 if can't register (errno set) 191 */ 192 193 int 194 svc_auth_reg(cred_flavor, handler) 195 int cred_flavor; 196 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 197 { 198 struct authsvc *asp; 199 200 switch (cred_flavor) { 201 case AUTH_NULL: 202 case AUTH_SYS: 203 case AUTH_SHORT: 204 #ifdef DES_BUILTIN 205 case AUTH_DES: 206 #endif 207 /* already registered */ 208 return (1); 209 210 default: 211 mutex_lock(&authsvc_lock); 212 for (asp = Auths; asp; asp = asp->next) { 213 if (asp->flavor == cred_flavor) { 214 /* already registered */ 215 mutex_unlock(&authsvc_lock); 216 return (1); 217 } 218 } 219 220 /* this is a new one, so go ahead and register it */ 221 asp = mem_alloc(sizeof (*asp)); 222 if (asp == NULL) { 223 mutex_unlock(&authsvc_lock); 224 return (-1); 225 } 226 asp->flavor = cred_flavor; 227 asp->handler = handler; 228 asp->next = Auths; 229 Auths = asp; 230 mutex_unlock(&authsvc_lock); 231 break; 232 } 233 return (0); 234 } 235