svc_auth.c revision 1.15
1 /* $NetBSD: svc_auth.c,v 1.15 2003/09/09 03:56:40 itojun 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 1.15 2003/09/09 03:56:40 itojun 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) __P((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(rqst, msg) 105 struct svc_req *rqst; 106 struct rpc_msg *msg; 107 { 108 int cred_flavor; 109 struct authsvc *asp; 110 enum auth_stat dummy; 111 #ifdef _REENTRANT 112 extern mutex_t authsvc_lock; 113 #endif 114 115 _DIAGASSERT(rqst != NULL); 116 _DIAGASSERT(msg != NULL); 117 118 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 119 120 rqst->rq_cred = msg->rm_call.cb_cred; 121 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 122 rqst->rq_xprt->xp_verf.oa_length = 0; 123 cred_flavor = rqst->rq_cred.oa_flavor; 124 switch (cred_flavor) { 125 case AUTH_NULL: 126 dummy = _svcauth_null(rqst, msg); 127 return (dummy); 128 case AUTH_SYS: 129 dummy = _svcauth_unix(rqst, msg); 130 return (dummy); 131 case AUTH_SHORT: 132 dummy = _svcauth_short(rqst, msg); 133 return (dummy); 134 #if 0 135 case AUTH_DES: 136 dummy = __svcauth_des(rqst, msg); 137 return (dummy); 138 #endif 139 default: 140 break; 141 } 142 143 /* flavor doesn't match any of the builtin types, so try new ones */ 144 mutex_lock(&authsvc_lock); 145 for (asp = Auths; asp; asp = asp->next) { 146 if (asp->flavor == cred_flavor) { 147 enum auth_stat as; 148 149 as = (*asp->handler)(rqst, msg); 150 mutex_unlock(&authsvc_lock); 151 return (as); 152 } 153 } 154 mutex_unlock(&authsvc_lock); 155 156 return (AUTH_REJECTEDCRED); 157 } 158 159 /*ARGSUSED*/ 160 enum auth_stat 161 _svcauth_null(rqst, msg) 162 struct svc_req *rqst; 163 struct rpc_msg *msg; 164 { 165 return (AUTH_OK); 166 } 167 168 /* 169 * Allow the rpc service to register new authentication types that it is 170 * prepared to handle. When an authentication flavor is registered, 171 * the flavor is checked against already registered values. If not 172 * registered, then a new Auths entry is added on the list. 173 * 174 * There is no provision to delete a registration once registered. 175 * 176 * This routine returns: 177 * 0 if registration successful 178 * 1 if flavor already registered 179 * -1 if can't register (errno set) 180 */ 181 182 int 183 svc_auth_reg(cred_flavor, handler) 184 int cred_flavor; 185 enum auth_stat (*handler) __P((struct svc_req *, struct rpc_msg *)); 186 { 187 struct authsvc *asp; 188 #ifdef _REENTRANT 189 extern mutex_t authsvc_lock; 190 #endif 191 192 switch (cred_flavor) { 193 case AUTH_NULL: 194 case AUTH_SYS: 195 case AUTH_SHORT: 196 #if 0 197 case AUTH_DES: 198 #endif 199 /* already registered */ 200 return (1); 201 202 default: 203 mutex_lock(&authsvc_lock); 204 for (asp = Auths; asp; asp = asp->next) { 205 if (asp->flavor == cred_flavor) { 206 /* already registered */ 207 mutex_unlock(&authsvc_lock); 208 return (1); 209 } 210 } 211 212 /* this is a new one, so go ahead and register it */ 213 asp = mem_alloc(sizeof (*asp)); 214 if (asp == NULL) { 215 mutex_unlock(&authsvc_lock); 216 return (-1); 217 } 218 asp->flavor = cred_flavor; 219 asp->handler = handler; 220 asp->next = Auths; 221 Auths = asp; 222 mutex_unlock(&authsvc_lock); 223 break; 224 } 225 return (0); 226 } 227
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