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