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 /* #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" */ 36 37 #if !defined(lint) && defined(SCCSIDS) 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 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 /* 79 * The call rpc message, msg has been obtained from the wire. The msg contains 80 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 81 * if the msg is successfully authenticated. If AUTH_OK then the routine also 82 * does the following things: 83 * set rqst->rq_xprt->verf to the appropriate response verifier; 84 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 85 * 86 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 87 * its length is set appropriately. 88 * 89 * The caller still owns and is responsible for msg->u.cmb.cred and 90 * msg->u.cmb.verf. The authentication system retains ownership of 91 * rqst->rq_client_cred, the cooked credentials. 92 * 93 * There is an assumption that any flavour less than AUTH_NULL is 94 * invalid. 95 */ 96 enum auth_stat 97 _authenticate(rqst, msg) 98 struct svc_req *rqst; 99 struct rpc_msg *msg; 100 { 101 int cred_flavor; 102 struct authsvc *asp; 103 enum auth_stat dummy; 104 extern mutex_t authsvc_lock; 105 106 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 107 108 rqst->rq_cred = msg->rm_call.cb_cred; 109 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 110 rqst->rq_xprt->xp_verf.oa_length = 0; 111 cred_flavor = rqst->rq_cred.oa_flavor; 112 switch (cred_flavor) { 113 case AUTH_NULL: 114 dummy = _svcauth_null(rqst, msg); 115 return (dummy); 116 case AUTH_SYS: 117 dummy = _svcauth_unix(rqst, msg); 118 return (dummy); 119 case AUTH_SHORT: 120 dummy = _svcauth_short(rqst, msg); 121 return (dummy); 122 #ifdef DES_BUILTIN 123 case AUTH_DES: 124 dummy = _svcauth_des(rqst, msg); 125 return (dummy); 126 #endif 127 default: 128 break; 129 } 130 131 /* flavor doesn't match any of the builtin types, so try new ones */ 132 mutex_lock(&authsvc_lock); 133 for (asp = Auths; asp; asp = asp->next) { 134 if (asp->flavor == cred_flavor) { 135 enum auth_stat as; 136 137 as = (*asp->handler)(rqst, msg); 138 mutex_unlock(&authsvc_lock); 139 return (as); 140 } 141 } 142 mutex_unlock(&authsvc_lock); 143 144 return (AUTH_REJECTEDCRED); 145 } 146 147 /*ARGSUSED*/ 148 enum auth_stat 149 _svcauth_null(rqst, msg) 150 struct svc_req *rqst; 151 struct rpc_msg *msg; 152 { 153 return (AUTH_OK); 154 } 155 156 /* 157 * Allow the rpc service to register new authentication types that it is 158 * prepared to handle. When an authentication flavor is registered, 159 * the flavor is checked against already registered values. If not 160 * registered, then a new Auths entry is added on the list. 161 * 162 * There is no provision to delete a registration once registered. 163 * 164 * This routine returns: 165 * 0 if registration successful 166 * 1 if flavor already registered 167 * -1 if can't register (errno set) 168 */ 169 170 int 171 svc_auth_reg(cred_flavor, handler) 172 int cred_flavor; 173 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 174 { 175 struct authsvc *asp; 176 extern mutex_t authsvc_lock; 177 178 switch (cred_flavor) { 179 case AUTH_NULL: 180 case AUTH_SYS: 181 case AUTH_SHORT: 182 #ifdef DES_BUILTIN 183 case AUTH_DES: 184 #endif 185 /* already registered */ 186 return (1); 187 188 default: 189 mutex_lock(&authsvc_lock); 190 for (asp = Auths; asp; asp = asp->next) { 191 if (asp->flavor == cred_flavor) { 192 /* already registered */ 193 mutex_unlock(&authsvc_lock); 194 return (1); 195 } 196 } 197 198 /* this is a new one, so go ahead and register it */ 199 asp = mem_alloc(sizeof (*asp)); 200 if (asp == NULL) { 201 mutex_unlock(&authsvc_lock); 202 return (-1); 203 } 204 asp->flavor = cred_flavor; 205 asp->handler = handler; 206 asp->next = Auths; 207 Auths = asp; 208 mutex_unlock(&authsvc_lock); 209 break; 210 } 211 return (0); 212 } 213