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 /* 30 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 31 */ 32 33 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" 34 35 #if !defined(lint) && defined(SCCSIDS) 36 #if 0 37 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 38 #else 39 static const char rcsid[] = 40 "$FreeBSD$"; 41 #endif 42 #endif 43 44 /* 45 * svc_auth.c, Server-side rpc authenticator interface. 46 * 47 */ 48 49 #ifdef _KERNEL 50 #include <sys/param.h> 51 #include <rpc/types.h> 52 #include <rpc/xdr.h> 53 #include <rpc/auth.h> 54 #include <rpc/clnt.h> 55 #include <rpc/rpc_msg.h> 56 #include <rpc/svc.h> 57 #include <rpc/svc_auth.h> 58 #else 59 #include <stdlib.h> 60 #include <rpc/rpc.h> 61 #endif 62 #include <sys/types.h> 63 64 /* 65 * svcauthsw is the bdevsw of server side authentication. 66 * 67 * Server side authenticators are called from authenticate by 68 * using the client auth struct flavor field to index into svcauthsw. 69 * The server auth flavors must implement a routine that looks 70 * like: 71 * 72 * enum auth_stat 73 * flavorx_auth(rqst, msg) 74 * register struct svc_req *rqst; 75 * register struct rpc_msg *msg; 76 * 77 */ 78 79 enum auth_stat _svcauth_null(); /* no authentication */ 80 enum auth_stat _svcauth_unix(); /* (system) unix style (uid, gids) */ 81 enum auth_stat _svcauth_short(); /* short hand unix style */ 82 enum auth_stat _svcauth_des(); /* des style */ 83 84 /* declarations to allow servers to specify new authentication flavors */ 85 struct authsvc { 86 int flavor; 87 enum auth_stat (*handler)(); 88 struct authsvc *next; 89 }; 90 static struct authsvc *Auths = NULL; 91 92 /* 93 * The call rpc message, msg has been obtained from the wire. The msg contains 94 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 95 * if the msg is successfully authenticated. If AUTH_OK then the routine also 96 * does the following things: 97 * set rqst->rq_xprt->verf to the appropriate response verifier; 98 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 99 * 100 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 101 * its length is set appropriately. 102 * 103 * The caller still owns and is responsible for msg->u.cmb.cred and 104 * msg->u.cmb.verf. The authentication system retains ownership of 105 * rqst->rq_client_cred, the cooked credentials. 106 * 107 * There is an assumption that any flavour less than AUTH_NULL is 108 * invalid. 109 */ 110 enum auth_stat 111 _authenticate(rqst, msg) 112 register struct svc_req *rqst; 113 struct rpc_msg *msg; 114 { 115 register int cred_flavor; 116 register struct authsvc *asp; 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 return(_svcauth_null(rqst, msg)); 125 case AUTH_UNIX: 126 return(_svcauth_unix(rqst, msg)); 127 case AUTH_SHORT: 128 return(_svcauth_short(rqst, msg)); 129 /* 130 * We leave AUTH_DES turned off by default because svcauth_des() 131 * needs getpublickey(), which is in librpcsvc, not libc. If we 132 * included AUTH_DES as a built-in flavor, programs that don't 133 * have -lrpcsvc in their Makefiles wouldn't link correctly, even 134 * though they don't use AUTH_DES. And I'm too lazy to go through 135 * the tree looking for all of them. 136 */ 137 #ifdef DES_BUILTIN 138 case AUTH_DES: 139 return(_svcauth_des(rqst, msg)); 140 #endif 141 } 142 143 /* flavor doesn't match any of the builtin types, so try new ones */ 144 for (asp = Auths; asp; asp = asp->next) { 145 if (asp->flavor == cred_flavor) { 146 enum auth_stat as; 147 148 as = (*asp->handler)(rqst, msg); 149 return (as); 150 } 151 } 152 153 return (AUTH_REJECTEDCRED); 154 } 155 156 /*ARGSUSED*/ 157 enum auth_stat 158 _svcauth_null(rqst, msg) 159 struct svc_req *rqst; 160 struct rpc_msg *msg; 161 { 162 return (AUTH_OK); 163 } 164 165 /* 166 * Allow the rpc service to register new authentication types that it is 167 * prepared to handle. When an authentication flavor is registered, 168 * the flavor is checked against already registered values. If not 169 * registered, then a new Auths entry is added on the list. 170 * 171 * There is no provision to delete a registration once registered. 172 * 173 * This routine returns: 174 * 0 if registration successful 175 * 1 if flavor already registered 176 * -1 if can't register (errno set) 177 */ 178 179 int 180 svc_auth_reg(cred_flavor, handler) 181 register int cred_flavor; 182 enum auth_stat (*handler)(); 183 { 184 register struct authsvc *asp; 185 186 switch (cred_flavor) { 187 case AUTH_NULL: 188 case AUTH_UNIX: 189 case AUTH_SHORT: 190 #ifdef DES_BUILTIN 191 case AUTH_DES: 192 #endif 193 /* already registered */ 194 return (1); 195 196 default: 197 for (asp = Auths; asp; asp = asp->next) { 198 if (asp->flavor == cred_flavor) { 199 /* already registered */ 200 return (1); 201 } 202 } 203 204 /* this is a new one, so go ahead and register it */ 205 asp = (struct authsvc *)mem_alloc(sizeof (*asp)); 206 if (asp == NULL) { 207 return (-1); 208 } 209 asp->flavor = cred_flavor; 210 asp->handler = handler; 211 asp->next = Auths; 212 Auths = asp; 213 break; 214 } 215 return (0); 216 } 217