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/jail.h> 52 #include <sys/ucred.h> 53 54 #include <rpc/rpc.h> 55 56 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *, 57 struct rpc_msg *) = NULL; 58 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *, 59 struct ucred **, int *); 60 61 static struct svc_auth_ops svc_auth_null_ops; 62 63 /* 64 * The call rpc message, msg has been obtained from the wire. The msg contains 65 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 66 * if the msg is successfully authenticated. If AUTH_OK then the routine also 67 * does the following things: 68 * set rqst->rq_xprt->verf to the appropriate response verifier; 69 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 70 * 71 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 72 * its length is set appropriately. 73 * 74 * The caller still owns and is responsible for msg->u.cmb.cred and 75 * msg->u.cmb.verf. The authentication system retains ownership of 76 * rqst->rq_client_cred, the cooked credentials. 77 * 78 * There is an assumption that any flavour less than AUTH_NULL is 79 * invalid. 80 */ 81 enum auth_stat 82 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 83 { 84 int cred_flavor; 85 enum auth_stat dummy; 86 87 rqst->rq_cred = msg->rm_call.cb_cred; 88 rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops; 89 rqst->rq_auth.svc_ah_private = NULL; 90 cred_flavor = rqst->rq_cred.oa_flavor; 91 switch (cred_flavor) { 92 case AUTH_NULL: 93 dummy = _svcauth_null(rqst, msg); 94 return (dummy); 95 case AUTH_SYS: 96 dummy = _svcauth_unix(rqst, msg); 97 return (dummy); 98 case AUTH_SHORT: 99 dummy = _svcauth_short(rqst, msg); 100 return (dummy); 101 case RPCSEC_GSS: 102 if (!_svcauth_rpcsec_gss) 103 return (AUTH_REJECTEDCRED); 104 dummy = _svcauth_rpcsec_gss(rqst, msg); 105 return (dummy); 106 default: 107 break; 108 } 109 110 return (AUTH_REJECTEDCRED); 111 } 112 113 /* 114 * A set of null auth methods used by any authentication protocols 115 * that don't need to inspect or modify the message body. 116 */ 117 static bool_t 118 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp) 119 { 120 121 return (TRUE); 122 } 123 124 static bool_t 125 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp) 126 { 127 128 return (TRUE); 129 } 130 131 static void 132 svcauth_null_release(SVCAUTH *auth) 133 { 134 135 } 136 137 static struct svc_auth_ops svc_auth_null_ops = { 138 svcauth_null_wrap, 139 svcauth_null_unwrap, 140 svcauth_null_release, 141 }; 142 143 /*ARGSUSED*/ 144 enum auth_stat 145 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 146 { 147 148 rqst->rq_verf = _null_auth; 149 return (AUTH_OK); 150 } 151 152 int 153 svc_auth_reg(int flavor, 154 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *), 155 int (*getcred)(struct svc_req *, struct ucred **, int *)) 156 { 157 158 if (flavor == RPCSEC_GSS) { 159 _svcauth_rpcsec_gss = svcauth; 160 _svcauth_rpcsec_gss_getcred = getcred; 161 } 162 return (TRUE); 163 } 164 165 int 166 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp) 167 { 168 struct ucred *cr = NULL; 169 int flavor; 170 struct xucred *xcr; 171 172 flavor = rqst->rq_cred.oa_flavor; 173 if (flavorp) 174 *flavorp = flavor; 175 176 switch (flavor) { 177 case AUTH_UNIX: 178 xcr = (struct xucred *) rqst->rq_clntcred; 179 cr = crget(); 180 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid; 181 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups); 182 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; 183 cr->cr_prison = &prison0; 184 prison_hold(cr->cr_prison); 185 *crp = cr; 186 return (TRUE); 187 188 case RPCSEC_GSS: 189 if (!_svcauth_rpcsec_gss_getcred) 190 return (FALSE); 191 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp)); 192 193 default: 194 return (FALSE); 195 } 196 } 197 198