1 /* $NetBSD: svc_auth.c,v 1.13 2001/01/04 14:42:21 lukem 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 0 38 #if !defined(lint) && defined(SCCSIDS) 39 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 40 #endif 41 #endif 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 <assert.h> 53 #include <stdlib.h> 54 55 #ifdef __weak_alias 56 __weak_alias(svc_auth_reg,_svc_auth_reg) 57 #endif 58 59 /* 60 * svcauthsw is the bdevsw of server side authentication. 61 * 62 * Server side authenticators are called from authenticate by 63 * using the client auth struct flavor field to index into svcauthsw. 64 * The server auth flavors must implement a routine that looks 65 * like: 66 * 67 * enum auth_stat 68 * flavorx_auth(rqst, msg) 69 * struct svc_req *rqst; 70 * struct rpc_msg *msg; 71 * 72 */ 73 74 /* declarations to allow servers to specify new authentication flavors */ 75 struct authsvc { 76 int flavor; 77 enum auth_stat (*handler) __P((struct svc_req *, struct rpc_msg *)); 78 struct authsvc *next; 79 }; 80 static struct authsvc *Auths = NULL; 81 82 /* 83 * The call rpc message, msg has been obtained from the wire. The msg contains 84 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 85 * if the msg is successfully authenticated. If AUTH_OK then the routine also 86 * does the following things: 87 * set rqst->rq_xprt->verf to the appropriate response verifier; 88 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 89 * 90 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 91 * its length is set appropriately. 92 * 93 * The caller still owns and is responsible for msg->u.cmb.cred and 94 * msg->u.cmb.verf. The authentication system retains ownership of 95 * rqst->rq_client_cred, the cooked credentials. 96 * 97 * There is an assumption that any flavour less than AUTH_NULL is 98 * invalid. 99 */ 100 enum auth_stat 101 _authenticate(rqst, msg) 102 struct svc_req *rqst; 103 struct rpc_msg *msg; 104 { 105 int cred_flavor; 106 struct authsvc *asp; 107 enum auth_stat dummy; 108 #ifdef __REENT 109 extern mutex_t authsvc_lock; 110 #endif 111 112 _DIAGASSERT(rqst != NULL); 113 _DIAGASSERT(msg != NULL); 114 115 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 116 117 rqst->rq_cred = msg->rm_call.cb_cred; 118 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 119 rqst->rq_xprt->xp_verf.oa_length = 0; 120 cred_flavor = rqst->rq_cred.oa_flavor; 121 switch (cred_flavor) { 122 case AUTH_NULL: 123 dummy = _svcauth_null(rqst, msg); 124 return (dummy); 125 case AUTH_SYS: 126 dummy = _svcauth_unix(rqst, msg); 127 return (dummy); 128 case AUTH_SHORT: 129 dummy = _svcauth_short(rqst, msg); 130 return (dummy); 131 #if 0 132 case AUTH_DES: 133 dummy = __svcauth_des(rqst, msg); 134 return (dummy); 135 #endif 136 default: 137 break; 138 } 139 140 /* flavor doesn't match any of the builtin types, so try new ones */ 141 mutex_lock(&authsvc_lock); 142 for (asp = Auths; asp; asp = asp->next) { 143 if (asp->flavor == cred_flavor) { 144 enum auth_stat as; 145 146 as = (*asp->handler)(rqst, msg); 147 mutex_unlock(&authsvc_lock); 148 return (as); 149 } 150 } 151 mutex_unlock(&authsvc_lock); 152 153 return (AUTH_REJECTEDCRED); 154 } 155 156 /*ARGSUSED*/ 157 enum auth_stat 158 _svcauth_null(rqst, msg) 159 struct svc_req *rqst; 160 struct rpc_msg *msg; 161 { 162 return (AUTH_OK); 163 } 164 165 /* 166 * Allow the rpc service to register new authentication types that it is 167 * prepared to handle. When an authentication flavor is registered, 168 * the flavor is checked against already registered values. If not 169 * registered, then a new Auths entry is added on the list. 170 * 171 * There is no provision to delete a registration once registered. 172 * 173 * This routine returns: 174 * 0 if registration successful 175 * 1 if flavor already registered 176 * -1 if can't register (errno set) 177 */ 178 179 int 180 svc_auth_reg(cred_flavor, handler) 181 int cred_flavor; 182 enum auth_stat (*handler) __P((struct svc_req *, struct rpc_msg *)); 183 { 184 struct authsvc *asp; 185 #ifdef __REENT 186 extern mutex_t authsvc_lock; 187 #endif 188 189 switch (cred_flavor) { 190 case AUTH_NULL: 191 case AUTH_SYS: 192 case AUTH_SHORT: 193 #if 0 194 case AUTH_DES: 195 #endif 196 /* already registered */ 197 return (1); 198 199 default: 200 mutex_lock(&authsvc_lock); 201 for (asp = Auths; asp; asp = asp->next) { 202 if (asp->flavor == cred_flavor) { 203 /* already registered */ 204 mutex_unlock(&authsvc_lock); 205 return (1); 206 } 207 } 208 209 /* this is a new one, so go ahead and register it */ 210 asp = mem_alloc(sizeof (*asp)); 211 if (asp == NULL) { 212 mutex_unlock(&authsvc_lock); 213 return (-1); 214 } 215 asp->flavor = cred_flavor; 216 asp->handler = handler; 217 asp->next = Auths; 218 Auths = asp; 219 mutex_unlock(&authsvc_lock); 220 break; 221 } 222 return (0); 223 } 224