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 #if defined(LIBC_SCCS) && !defined(lint) 36 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" 37 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 38 #endif 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 /* 43 * svc_auth.c, Server-side rpc authenticator interface. 44 * 45 */ 46 47 #include "namespace.h" 48 #include "reentrant.h" 49 #include <sys/types.h> 50 #include <rpc/rpc.h> 51 #include <stdlib.h> 52 #include "un-namespace.h" 53 #include "mt_misc.h" 54 55 /* 56 * svcauthsw is the bdevsw of server side authentication. 57 * 58 * Server side authenticators are called from authenticate by 59 * using the client auth struct flavor field to index into svcauthsw. 60 * The server auth flavors must implement a routine that looks 61 * like: 62 * 63 * enum auth_stat 64 * flavorx_auth(rqst, msg) 65 * struct svc_req *rqst; 66 * struct rpc_msg *msg; 67 * 68 */ 69 70 /* declarations to allow servers to specify new authentication flavors */ 71 struct authsvc { 72 int flavor; 73 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 74 struct authsvc *next; 75 }; 76 static struct authsvc *Auths = NULL; 77 78 /* 79 * The call rpc message, msg has been obtained from the wire. The msg contains 80 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 81 * if the msg is successfully authenticated. If AUTH_OK then the routine also 82 * does the following things: 83 * set rqst->rq_xprt->verf to the appropriate response verifier; 84 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 85 * 86 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 87 * its length is set appropriately. 88 * 89 * The caller still owns and is responsible for msg->u.cmb.cred and 90 * msg->u.cmb.verf. The authentication system retains ownership of 91 * rqst->rq_client_cred, the cooked credentials. 92 * 93 * There is an assumption that any flavour less than AUTH_NULL is 94 * invalid. 95 */ 96 enum auth_stat 97 _authenticate(rqst, msg) 98 struct svc_req *rqst; 99 struct rpc_msg *msg; 100 { 101 int cred_flavor; 102 struct authsvc *asp; 103 enum auth_stat dummy; 104 105 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 106 107 rqst->rq_cred = msg->rm_call.cb_cred; 108 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 109 rqst->rq_xprt->xp_verf.oa_length = 0; 110 cred_flavor = rqst->rq_cred.oa_flavor; 111 switch (cred_flavor) { 112 case AUTH_NULL: 113 dummy = _svcauth_null(rqst, msg); 114 return (dummy); 115 case AUTH_SYS: 116 dummy = _svcauth_unix(rqst, msg); 117 return (dummy); 118 case AUTH_SHORT: 119 dummy = _svcauth_short(rqst, msg); 120 return (dummy); 121 #ifdef DES_BUILTIN 122 case AUTH_DES: 123 dummy = _svcauth_des(rqst, msg); 124 return (dummy); 125 #endif 126 default: 127 break; 128 } 129 130 /* flavor doesn't match any of the builtin types, so try new ones */ 131 mutex_lock(&authsvc_lock); 132 for (asp = Auths; asp; asp = asp->next) { 133 if (asp->flavor == cred_flavor) { 134 enum auth_stat as; 135 136 as = (*asp->handler)(rqst, msg); 137 mutex_unlock(&authsvc_lock); 138 return (as); 139 } 140 } 141 mutex_unlock(&authsvc_lock); 142 143 return (AUTH_REJECTEDCRED); 144 } 145 146 /*ARGSUSED*/ 147 enum auth_stat 148 _svcauth_null(rqst, msg) 149 struct svc_req *rqst; 150 struct rpc_msg *msg; 151 { 152 return (AUTH_OK); 153 } 154 155 /* 156 * Allow the rpc service to register new authentication types that it is 157 * prepared to handle. When an authentication flavor is registered, 158 * the flavor is checked against already registered values. If not 159 * registered, then a new Auths entry is added on the list. 160 * 161 * There is no provision to delete a registration once registered. 162 * 163 * This routine returns: 164 * 0 if registration successful 165 * 1 if flavor already registered 166 * -1 if can't register (errno set) 167 */ 168 169 int 170 svc_auth_reg(cred_flavor, handler) 171 int cred_flavor; 172 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 173 { 174 struct authsvc *asp; 175 176 switch (cred_flavor) { 177 case AUTH_NULL: 178 case AUTH_SYS: 179 case AUTH_SHORT: 180 #ifdef DES_BUILTIN 181 case AUTH_DES: 182 #endif 183 /* already registered */ 184 return (1); 185 186 default: 187 mutex_lock(&authsvc_lock); 188 for (asp = Auths; asp; asp = asp->next) { 189 if (asp->flavor == cred_flavor) { 190 /* already registered */ 191 mutex_unlock(&authsvc_lock); 192 return (1); 193 } 194 } 195 196 /* this is a new one, so go ahead and register it */ 197 asp = mem_alloc(sizeof (*asp)); 198 if (asp == NULL) { 199 mutex_unlock(&authsvc_lock); 200 return (-1); 201 } 202 asp->flavor = cred_flavor; 203 asp->handler = handler; 204 asp->next = Auths; 205 Auths = asp; 206 mutex_unlock(&authsvc_lock); 207 break; 208 } 209 return (0); 210 } 211