1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro 30 * $FreeBSD: src/lib/libc/rpc/svc_auth.c,v 1.7 1999/12/29 05:04:16 peter Exp $ 31 * $DragonFly: src/lib/libc/rpc/svc_auth.c,v 1.3 2004/10/25 19:38:02 drhodus Exp $ 32 */ 33 /* 34 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 35 */ 36 37 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" 38 39 /* 40 * svc_auth.c, Server-side rpc authenticator interface. 41 * 42 */ 43 44 #ifdef _KERNEL 45 #include <sys/param.h> 46 #include <rpc/types.h> 47 #include <rpc/xdr.h> 48 #include <rpc/auth.h> 49 #include <rpc/clnt.h> 50 #include <rpc/rpc_msg.h> 51 #include <rpc/svc.h> 52 #include <rpc/svc_auth.h> 53 #else 54 #include <stdlib.h> 55 #include <rpc/rpc.h> 56 #endif 57 #include <sys/types.h> 58 59 /* 60 * svcauthsw is the bdevsw of server side authentication. 61 * 62 * Server side authenticators are called from authenticate by 63 * using the client auth struct flavor field to index into svcauthsw. 64 * The server auth flavors must implement a routine that looks 65 * like: 66 * 67 * enum auth_stat 68 * flavorx_auth(rqst, msg) 69 * struct svc_req *rqst; 70 * struct rpc_msg *msg; 71 * 72 */ 73 74 enum auth_stat _svcauth_null(); /* no authentication */ 75 enum auth_stat _svcauth_unix(); /* (system) unix style (uid, gids) */ 76 enum auth_stat _svcauth_short(); /* short hand unix style */ 77 enum auth_stat _svcauth_des(); /* des style */ 78 79 /* declarations to allow servers to specify new authentication flavors */ 80 struct authsvc { 81 int flavor; 82 enum auth_stat (*handler)(); 83 struct authsvc *next; 84 }; 85 static struct authsvc *Auths = NULL; 86 87 /* 88 * The call rpc message, msg has been obtained from the wire. The msg contains 89 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 90 * if the msg is successfully authenticated. If AUTH_OK then the routine also 91 * does the following things: 92 * set rqst->rq_xprt->verf to the appropriate response verifier; 93 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 94 * 95 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 96 * its length is set appropriately. 97 * 98 * The caller still owns and is responsible for msg->u.cmb.cred and 99 * msg->u.cmb.verf. The authentication system retains ownership of 100 * rqst->rq_client_cred, the cooked credentials. 101 * 102 * There is an assumption that any flavour less than AUTH_NULL is 103 * invalid. 104 */ 105 enum auth_stat 106 _authenticate(rqst, msg) 107 struct svc_req *rqst; 108 struct rpc_msg *msg; 109 { 110 int cred_flavor; 111 struct authsvc *asp; 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 return(_svcauth_null(rqst, msg)); 120 case AUTH_UNIX: 121 return(_svcauth_unix(rqst, msg)); 122 case AUTH_SHORT: 123 return(_svcauth_short(rqst, msg)); 124 /* 125 * We leave AUTH_DES turned off by default because svcauth_des() 126 * needs getpublickey(), which is in librpcsvc, not libc. If we 127 * included AUTH_DES as a built-in flavor, programs that don't 128 * have -lrpcsvc in their Makefiles wouldn't link correctly, even 129 * though they don't use AUTH_DES. And I'm too lazy to go through 130 * the tree looking for all of them. 131 */ 132 #ifdef DES_BUILTIN 133 case AUTH_DES: 134 return(_svcauth_des(rqst, msg)); 135 #endif 136 } 137 138 /* flavor doesn't match any of the builtin types, so try new ones */ 139 for (asp = Auths; asp; asp = asp->next) { 140 if (asp->flavor == cred_flavor) { 141 enum auth_stat as; 142 143 as = (*asp->handler)(rqst, msg); 144 return (as); 145 } 146 } 147 148 return (AUTH_REJECTEDCRED); 149 } 150 151 /*ARGSUSED*/ 152 enum auth_stat 153 _svcauth_null(rqst, msg) 154 struct svc_req *rqst; 155 struct rpc_msg *msg; 156 { 157 return (AUTH_OK); 158 } 159 160 /* 161 * Allow the rpc service to register new authentication types that it is 162 * prepared to handle. When an authentication flavor is registered, 163 * the flavor is checked against already registered values. If not 164 * registered, then a new Auths entry is added on the list. 165 * 166 * There is no provision to delete a registration once registered. 167 * 168 * This routine returns: 169 * 0 if registration successful 170 * 1 if flavor already registered 171 * -1 if can't register (errno set) 172 */ 173 174 int 175 svc_auth_reg(cred_flavor, handler) 176 int cred_flavor; 177 enum auth_stat (*handler)(); 178 { 179 struct authsvc *asp; 180 181 switch (cred_flavor) { 182 case AUTH_NULL: 183 case AUTH_UNIX: 184 case AUTH_SHORT: 185 #ifdef DES_BUILTIN 186 case AUTH_DES: 187 #endif 188 /* already registered */ 189 return (1); 190 191 default: 192 for (asp = Auths; asp; asp = asp->next) { 193 if (asp->flavor == cred_flavor) { 194 /* already registered */ 195 return (1); 196 } 197 } 198 199 /* this is a new one, so go ahead and register it */ 200 asp = (struct authsvc *)mem_alloc(sizeof (*asp)); 201 if (asp == NULL) { 202 return (-1); 203 } 204 asp->flavor = cred_flavor; 205 asp->handler = handler; 206 asp->next = Auths; 207 Auths = asp; 208 break; 209 } 210 return (0); 211 } 212