1 /* $NetBSD: svc_auth.c,v 1.16 2012/03/20 17:14:50 matt 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 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 #if 0 40 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 41 #else 42 __RCSID("$NetBSD: svc_auth.c,v 1.16 2012/03/20 17:14:50 matt Exp $"); 43 #endif 44 #endif 45 46 /* 47 * svc_auth.c, Server-side rpc authenticator interface. 48 * 49 */ 50 51 #include "namespace.h" 52 #include "reentrant.h" 53 #include <sys/types.h> 54 #include <rpc/rpc.h> 55 #include <assert.h> 56 #include <stdlib.h> 57 58 #ifdef __weak_alias 59 __weak_alias(svc_auth_reg,_svc_auth_reg) 60 #endif 61 62 /* 63 * svcauthsw is the bdevsw of server side authentication. 64 * 65 * Server side authenticators are called from authenticate by 66 * using the client auth struct flavor field to index into svcauthsw. 67 * The server auth flavors must implement a routine that looks 68 * like: 69 * 70 * enum auth_stat 71 * flavorx_auth(rqst, msg) 72 * struct svc_req *rqst; 73 * struct rpc_msg *msg; 74 * 75 */ 76 77 /* declarations to allow servers to specify new authentication flavors */ 78 struct authsvc { 79 int flavor; 80 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 81 struct authsvc *next; 82 }; 83 static struct authsvc *Auths = NULL; 84 85 /* 86 * The call rpc message, msg has been obtained from the wire. The msg contains 87 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 88 * if the msg is successfully authenticated. If AUTH_OK then the routine also 89 * does the following things: 90 * set rqst->rq_xprt->verf to the appropriate response verifier; 91 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 92 * 93 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 94 * its length is set appropriately. 95 * 96 * The caller still owns and is responsible for msg->u.cmb.cred and 97 * msg->u.cmb.verf. The authentication system retains ownership of 98 * rqst->rq_client_cred, the cooked credentials. 99 * 100 * There is an assumption that any flavour less than AUTH_NULL is 101 * invalid. 102 */ 103 enum auth_stat 104 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 105 { 106 int cred_flavor; 107 struct authsvc *asp; 108 enum auth_stat dummy; 109 #ifdef _REENTRANT 110 extern mutex_t authsvc_lock; 111 #endif 112 113 _DIAGASSERT(rqst != NULL); 114 _DIAGASSERT(msg != NULL); 115 116 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 117 118 rqst->rq_cred = msg->rm_call.cb_cred; 119 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 120 rqst->rq_xprt->xp_verf.oa_length = 0; 121 cred_flavor = rqst->rq_cred.oa_flavor; 122 switch (cred_flavor) { 123 case AUTH_NULL: 124 dummy = _svcauth_null(rqst, msg); 125 return (dummy); 126 case AUTH_SYS: 127 dummy = _svcauth_unix(rqst, msg); 128 return (dummy); 129 case AUTH_SHORT: 130 dummy = _svcauth_short(rqst, msg); 131 return (dummy); 132 #if 0 133 case AUTH_DES: 134 dummy = __svcauth_des(rqst, msg); 135 return (dummy); 136 #endif 137 default: 138 break; 139 } 140 141 /* flavor doesn't match any of the builtin types, so try new ones */ 142 mutex_lock(&authsvc_lock); 143 for (asp = Auths; asp; asp = asp->next) { 144 if (asp->flavor == cred_flavor) { 145 enum auth_stat as; 146 147 as = (*asp->handler)(rqst, msg); 148 mutex_unlock(&authsvc_lock); 149 return (as); 150 } 151 } 152 mutex_unlock(&authsvc_lock); 153 154 return (AUTH_REJECTEDCRED); 155 } 156 157 /*ARGSUSED*/ 158 enum auth_stat 159 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 160 { 161 return (AUTH_OK); 162 } 163 164 /* 165 * Allow the rpc service to register new authentication types that it is 166 * prepared to handle. When an authentication flavor is registered, 167 * the flavor is checked against already registered values. If not 168 * registered, then a new Auths entry is added on the list. 169 * 170 * There is no provision to delete a registration once registered. 171 * 172 * This routine returns: 173 * 0 if registration successful 174 * 1 if flavor already registered 175 * -1 if can't register (errno set) 176 */ 177 178 int 179 svc_auth_reg( 180 int cred_flavor, 181 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *)) 182 { 183 struct authsvc *asp; 184 #ifdef _REENTRANT 185 extern mutex_t authsvc_lock; 186 #endif 187 188 switch (cred_flavor) { 189 case AUTH_NULL: 190 case AUTH_SYS: 191 case AUTH_SHORT: 192 #if 0 193 case AUTH_DES: 194 #endif 195 /* already registered */ 196 return (1); 197 198 default: 199 mutex_lock(&authsvc_lock); 200 for (asp = Auths; asp; asp = asp->next) { 201 if (asp->flavor == cred_flavor) { 202 /* already registered */ 203 mutex_unlock(&authsvc_lock); 204 return (1); 205 } 206 } 207 208 /* this is a new one, so go ahead and register it */ 209 asp = mem_alloc(sizeof (*asp)); 210 if (asp == NULL) { 211 mutex_unlock(&authsvc_lock); 212 return (-1); 213 } 214 asp->flavor = cred_flavor; 215 asp->handler = handler; 216 asp->next = Auths; 217 Auths = asp; 218 mutex_unlock(&authsvc_lock); 219 break; 220 } 221 return (0); 222 } 223