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 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 <stdlib.h> 53 54 #ifdef __weak_alias 55 __weak_alias(svc_auth_reg,_svc_auth_reg) 56 #endif 57 58 /* 59 * svcauthsw is the bdevsw of server side authentication. 60 * 61 * Server side authenticators are called from authenticate by 62 * using the client auth struct flavor field to index into svcauthsw. 63 * The server auth flavors must implement a routine that looks 64 * like: 65 * 66 * enum auth_stat 67 * flavorx_auth(rqst, msg) 68 * struct svc_req *rqst; 69 * struct rpc_msg *msg; 70 * 71 */ 72 73 /* declarations to allow servers to specify new authentication flavors */ 74 struct authsvc { 75 int flavor; 76 enum auth_stat (*handler) __P((struct svc_req *, struct rpc_msg *)); 77 struct authsvc *next; 78 }; 79 static struct authsvc *Auths = NULL; 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(rqst, msg) 101 struct svc_req *rqst; 102 struct rpc_msg *msg; 103 { 104 int cred_flavor; 105 struct authsvc *asp; 106 enum auth_stat dummy; 107 #ifdef __REENT 108 extern mutex_t authsvc_lock; 109 #endif 110 111 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 112 113 rqst->rq_cred = msg->rm_call.cb_cred; 114 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 115 rqst->rq_xprt->xp_verf.oa_length = 0; 116 cred_flavor = rqst->rq_cred.oa_flavor; 117 switch (cred_flavor) { 118 case AUTH_NULL: 119 dummy = _svcauth_null(rqst, msg); 120 return (dummy); 121 case AUTH_SYS: 122 dummy = _svcauth_unix(rqst, msg); 123 return (dummy); 124 case AUTH_SHORT: 125 dummy = _svcauth_short(rqst, msg); 126 return (dummy); 127 #if 0 128 case AUTH_DES: 129 dummy = __svcauth_des(rqst, msg); 130 return (dummy); 131 #endif 132 default: 133 break; 134 } 135 136 /* flavor doesn't match any of the builtin types, so try new ones */ 137 mutex_lock(&authsvc_lock); 138 for (asp = Auths; asp; asp = asp->next) { 139 if (asp->flavor == cred_flavor) { 140 enum auth_stat as; 141 142 as = (*asp->handler)(rqst, msg); 143 mutex_unlock(&authsvc_lock); 144 return (as); 145 } 146 } 147 mutex_unlock(&authsvc_lock); 148 149 return (AUTH_REJECTEDCRED); 150 } 151 152 /*ARGSUSED*/ 153 enum auth_stat 154 _svcauth_null(rqst, msg) 155 struct svc_req *rqst; 156 struct rpc_msg *msg; 157 { 158 return (AUTH_OK); 159 } 160 161 /* 162 * Allow the rpc service to register new authentication types that it is 163 * prepared to handle. When an authentication flavor is registered, 164 * the flavor is checked against already registered values. If not 165 * registered, then a new Auths entry is added on the list. 166 * 167 * There is no provision to delete a registration once registered. 168 * 169 * This routine returns: 170 * 0 if registration successful 171 * 1 if flavor already registered 172 * -1 if can't register (errno set) 173 */ 174 175 int 176 svc_auth_reg(cred_flavor, handler) 177 int cred_flavor; 178 enum auth_stat (*handler) __P((struct svc_req *, struct rpc_msg *)); 179 { 180 struct authsvc *asp; 181 #ifdef __REENT 182 extern mutex_t authsvc_lock; 183 #endif 184 185 switch (cred_flavor) { 186 case AUTH_NULL: 187 case AUTH_SYS: 188 case AUTH_SHORT: 189 #if 0 190 case AUTH_DES: 191 #endif 192 /* already registered */ 193 return (1); 194 195 default: 196 mutex_lock(&authsvc_lock); 197 for (asp = Auths; asp; asp = asp->next) { 198 if (asp->flavor == cred_flavor) { 199 /* already registered */ 200 mutex_unlock(&authsvc_lock); 201 return (1); 202 } 203 } 204 205 /* this is a new one, so go ahead and register it */ 206 asp = mem_alloc(sizeof (*asp)); 207 if (asp == NULL) { 208 mutex_unlock(&authsvc_lock); 209 return (-1); 210 } 211 asp->flavor = cred_flavor; 212 asp->handler = handler; 213 asp->next = Auths; 214 Auths = asp; 215 mutex_unlock(&authsvc_lock); 216 break; 217 } 218 return (0); 219 } 220