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 <sys/param.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/systm.h> 51 #include <sys/ucred.h> 52 53 #include <rpc/rpc.h> 54 55 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *, 56 struct rpc_msg *) = NULL; 57 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *, 58 struct ucred **, int *); 59 60 static struct svc_auth_ops svc_auth_null_ops; 61 62 /* 63 * The call rpc message, msg has been obtained from the wire. The msg contains 64 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 65 * if the msg is successfully authenticated. If AUTH_OK then the routine also 66 * does the following things: 67 * set rqst->rq_xprt->verf to the appropriate response verifier; 68 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 69 * 70 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 71 * its length is set appropriately. 72 * 73 * The caller still owns and is responsible for msg->u.cmb.cred and 74 * msg->u.cmb.verf. The authentication system retains ownership of 75 * rqst->rq_client_cred, the cooked credentials. 76 * 77 * There is an assumption that any flavour less than AUTH_NULL is 78 * invalid. 79 */ 80 enum auth_stat 81 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 82 { 83 int cred_flavor; 84 enum auth_stat dummy; 85 86 rqst->rq_cred = msg->rm_call.cb_cred; 87 rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops; 88 rqst->rq_auth.svc_ah_private = NULL; 89 cred_flavor = rqst->rq_cred.oa_flavor; 90 switch (cred_flavor) { 91 case AUTH_NULL: 92 dummy = _svcauth_null(rqst, msg); 93 return (dummy); 94 case AUTH_SYS: 95 dummy = _svcauth_unix(rqst, msg); 96 return (dummy); 97 case AUTH_SHORT: 98 dummy = _svcauth_short(rqst, msg); 99 return (dummy); 100 case RPCSEC_GSS: 101 if (!_svcauth_rpcsec_gss) 102 return (AUTH_REJECTEDCRED); 103 dummy = _svcauth_rpcsec_gss(rqst, msg); 104 return (dummy); 105 default: 106 break; 107 } 108 109 return (AUTH_REJECTEDCRED); 110 } 111 112 /* 113 * A set of null auth methods used by any authentication protocols 114 * that don't need to inspect or modify the message body. 115 */ 116 static bool_t 117 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp) 118 { 119 120 return (TRUE); 121 } 122 123 static bool_t 124 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp) 125 { 126 127 return (TRUE); 128 } 129 130 static void 131 svcauth_null_release(SVCAUTH *auth) 132 { 133 134 } 135 136 static struct svc_auth_ops svc_auth_null_ops = { 137 svcauth_null_wrap, 138 svcauth_null_unwrap, 139 svcauth_null_release, 140 }; 141 142 /*ARGSUSED*/ 143 enum auth_stat 144 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 145 { 146 147 rqst->rq_verf = _null_auth; 148 return (AUTH_OK); 149 } 150 151 int 152 svc_auth_reg(int flavor, 153 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *), 154 int (*getcred)(struct svc_req *, struct ucred **, int *)) 155 { 156 157 if (flavor == RPCSEC_GSS) { 158 _svcauth_rpcsec_gss = svcauth; 159 _svcauth_rpcsec_gss_getcred = getcred; 160 } 161 return (TRUE); 162 } 163 164 int 165 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp) 166 { 167 struct ucred *cr = NULL; 168 int flavor, i; 169 struct xucred *xcr; 170 171 flavor = rqst->rq_cred.oa_flavor; 172 if (flavorp) 173 *flavorp = flavor; 174 175 switch (flavor) { 176 case AUTH_UNIX: 177 xcr = (struct xucred *) rqst->rq_clntcred; 178 cr = crget(); 179 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid; 180 cr->cr_ngroups = xcr->cr_ngroups; 181 for (i = 0; i < xcr->cr_ngroups; i++) 182 cr->cr_groups[i] = xcr->cr_groups[i]; 183 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; 184 *crp = cr; 185 return (TRUE); 186 187 case RPCSEC_GSS: 188 if (!_svcauth_rpcsec_gss_getcred) 189 return (FALSE); 190 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp)); 191 192 default: 193 return (FALSE); 194 } 195 } 196 197