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