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 1.16 94/04/24 SMI; 1.26 89/02/07 Copyr 1984 Sun Micro 30 * $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ 31 * $FreeBSD: src/lib/libc/rpc/svc_auth.c,v 1.13 2006/02/27 22:10:59 deischen Exp $ 32 * $DragonFly: src/lib/libc/rpc/svc_auth.c,v 1.4 2005/11/13 12:27:04 swildner Exp $ 33 */ 34 /* 35 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 36 */ 37 38 /* 39 * svc_auth.c, Server-side rpc authenticator interface. 40 */ 41 42 #include "namespace.h" 43 #include "reentrant.h" 44 #include <sys/types.h> 45 #include <rpc/rpc.h> 46 #include <stdlib.h> 47 #include "un-namespace.h" 48 #include "mt_misc.h" 49 50 /* 51 * svcauthsw is the bdevsw of server side authentication. 52 * 53 * Server side authenticators are called from authenticate by 54 * using the client auth struct flavor field to index into svcauthsw. 55 * The server auth flavors must implement a routine that looks 56 * like: 57 * 58 * enum auth_stat 59 * flavorx_auth(rqst, msg) 60 * struct svc_req *rqst; 61 * struct rpc_msg *msg; 62 * 63 */ 64 65 /* declarations to allow servers to specify new authentication flavors */ 66 struct authsvc { 67 int flavor; 68 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *); 69 struct authsvc *next; 70 }; 71 static struct authsvc *Auths = NULL; 72 73 /* 74 * The call rpc message, msg has been obtained from the wire. The msg contains 75 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 76 * if the msg is successfully authenticated. If AUTH_OK then the routine also 77 * does the following things: 78 * set rqst->rq_xprt->verf to the appropriate response verifier; 79 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 80 * 81 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 82 * its length is set appropriately. 83 * 84 * The caller still owns and is responsible for msg->u.cmb.cred and 85 * msg->u.cmb.verf. The authentication system retains ownership of 86 * rqst->rq_client_cred, the cooked credentials. 87 * 88 * There is an assumption that any flavour less than AUTH_NULL is 89 * invalid. 90 */ 91 enum auth_stat 92 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 93 { 94 int cred_flavor; 95 struct authsvc *asp; 96 enum auth_stat dummy; 97 98 /* VARIABLES PROTECTED BY authsvc_lock: asp, Auths */ 99 100 rqst->rq_cred = msg->rm_call.cb_cred; 101 rqst->rq_xprt->xp_verf.oa_flavor = _null_auth.oa_flavor; 102 rqst->rq_xprt->xp_verf.oa_length = 0; 103 cred_flavor = rqst->rq_cred.oa_flavor; 104 switch (cred_flavor) { 105 case AUTH_NULL: 106 dummy = _svcauth_null(rqst, msg); 107 return (dummy); 108 case AUTH_SYS: 109 dummy = _svcauth_unix(rqst, msg); 110 return (dummy); 111 case AUTH_SHORT: 112 dummy = _svcauth_short(rqst, msg); 113 return (dummy); 114 #ifdef DES_BUILTIN 115 case AUTH_DES: 116 dummy = _svcauth_des(rqst, msg); 117 return (dummy); 118 #endif 119 default: 120 break; 121 } 122 123 /* flavor doesn't match any of the builtin types, so try new ones */ 124 mutex_lock(&authsvc_lock); 125 for (asp = Auths; asp; asp = asp->next) { 126 if (asp->flavor == cred_flavor) { 127 enum auth_stat as; 128 129 as = (*asp->handler)(rqst, msg); 130 mutex_unlock(&authsvc_lock); 131 return (as); 132 } 133 } 134 mutex_unlock(&authsvc_lock); 135 136 return (AUTH_REJECTEDCRED); 137 } 138 139 /*ARGSUSED*/ 140 enum auth_stat 141 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 142 { 143 return (AUTH_OK); 144 } 145 146 /* 147 * Allow the rpc service to register new authentication types that it is 148 * prepared to handle. When an authentication flavor is registered, 149 * the flavor is checked against already registered values. If not 150 * registered, then a new Auths entry is added on the list. 151 * 152 * There is no provision to delete a registration once registered. 153 * 154 * This routine returns: 155 * 0 if registration successful 156 * 1 if flavor already registered 157 * -1 if can't register (errno set) 158 */ 159 160 int 161 svc_auth_reg(int cred_flavor, 162 enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *)) 163 { 164 struct authsvc *asp; 165 166 switch (cred_flavor) { 167 case AUTH_NULL: 168 case AUTH_SYS: 169 case AUTH_SHORT: 170 #ifdef DES_BUILTIN 171 case AUTH_DES: 172 #endif 173 /* already registered */ 174 return (1); 175 176 default: 177 mutex_lock(&authsvc_lock); 178 for (asp = Auths; asp; asp = asp->next) { 179 if (asp->flavor == cred_flavor) { 180 /* already registered */ 181 mutex_unlock(&authsvc_lock); 182 return (1); 183 } 184 } 185 186 /* this is a new one, so go ahead and register it */ 187 asp = mem_alloc(sizeof (*asp)); 188 if (asp == NULL) { 189 mutex_unlock(&authsvc_lock); 190 return (-1); 191 } 192 asp->flavor = cred_flavor; 193 asp->handler = handler; 194 asp->next = Auths; 195 Auths = asp; 196 mutex_unlock(&authsvc_lock); 197 break; 198 } 199 return (0); 200 } 201