1 /* $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 /* 31 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" 36 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 37 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * svc_auth.c, Server-side rpc authenticator interface. 43 * 44 */ 45 46 #include <sys/param.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/systm.h> 50 #include <sys/jail.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; 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 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups); 181 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; 182 cr->cr_prison = &prison0; 183 prison_hold(cr->cr_prison); 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