1 /* $NetBSD: svc_auth.c,v 1.12 2000/07/06 03:10:35 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2009, Sun Microsystems, Inc. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * - Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * - Neither the name of Sun Microsystems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 /* 33 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #ident "@(#)svc_auth.c 1.16 94/04/24 SMI" 38 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 39 #endif 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * svc_auth.c, Server-side rpc authenticator interface. 45 * 46 */ 47 48 #include <sys/param.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/systm.h> 52 #include <sys/jail.h> 53 #include <sys/ucred.h> 54 55 #include <rpc/rpc.h> 56 #include <rpc/rpcsec_tls.h> 57 58 static enum auth_stat (*_svcauth_rpcsec_gss)(struct svc_req *, 59 struct rpc_msg *) = NULL; 60 static int (*_svcauth_rpcsec_gss_getcred)(struct svc_req *, 61 struct ucred **, int *); 62 63 static const struct svc_auth_ops svc_auth_null_ops; 64 65 /* 66 * The call rpc message, msg has been obtained from the wire. The msg contains 67 * the raw form of credentials and verifiers. authenticate returns AUTH_OK 68 * if the msg is successfully authenticated. If AUTH_OK then the routine also 69 * does the following things: 70 * set rqst->rq_xprt->verf to the appropriate response verifier; 71 * sets rqst->rq_client_cred to the "cooked" form of the credentials. 72 * 73 * NB: rqst->rq_cxprt->verf must be pre-alloctaed; 74 * its length is set appropriately. 75 * 76 * The caller still owns and is responsible for msg->u.cmb.cred and 77 * msg->u.cmb.verf. The authentication system retains ownership of 78 * rqst->rq_client_cred, the cooked credentials. 79 * 80 * There is an assumption that any flavour less than AUTH_NULL is 81 * invalid. 82 */ 83 enum auth_stat 84 _authenticate(struct svc_req *rqst, struct rpc_msg *msg) 85 { 86 int cred_flavor; 87 enum auth_stat dummy; 88 89 rqst->rq_cred = msg->rm_call.cb_cred; 90 rqst->rq_auth.svc_ah_ops = &svc_auth_null_ops; 91 rqst->rq_auth.svc_ah_private = NULL; 92 cred_flavor = rqst->rq_cred.oa_flavor; 93 switch (cred_flavor) { 94 case AUTH_NULL: 95 dummy = _svcauth_null(rqst, msg); 96 return (dummy); 97 case AUTH_SYS: 98 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 99 return (AUTH_REJECTEDCRED); 100 dummy = _svcauth_unix(rqst, msg); 101 return (dummy); 102 case AUTH_SHORT: 103 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 104 return (AUTH_REJECTEDCRED); 105 dummy = _svcauth_short(rqst, msg); 106 return (dummy); 107 case RPCSEC_GSS: 108 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 109 return (AUTH_REJECTEDCRED); 110 if (!_svcauth_rpcsec_gss) 111 return (AUTH_REJECTEDCRED); 112 dummy = _svcauth_rpcsec_gss(rqst, msg); 113 return (dummy); 114 case AUTH_TLS: 115 dummy = _svcauth_rpcsec_tls(rqst, msg); 116 return (dummy); 117 default: 118 break; 119 } 120 121 return (AUTH_REJECTEDCRED); 122 } 123 124 /* 125 * A set of null auth methods used by any authentication protocols 126 * that don't need to inspect or modify the message body. 127 */ 128 static bool_t 129 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp) 130 { 131 132 return (TRUE); 133 } 134 135 static bool_t 136 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp) 137 { 138 139 return (TRUE); 140 } 141 142 static void 143 svcauth_null_release(SVCAUTH *auth) 144 { 145 146 } 147 148 static const struct svc_auth_ops svc_auth_null_ops = { 149 .svc_ah_wrap = svcauth_null_wrap, 150 .svc_ah_unwrap = svcauth_null_unwrap, 151 .svc_ah_release = svcauth_null_release, 152 }; 153 154 /*ARGSUSED*/ 155 enum auth_stat 156 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 157 { 158 159 rqst->rq_verf = _null_auth; 160 return (AUTH_OK); 161 } 162 163 int 164 svc_auth_reg(int flavor, 165 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *), 166 int (*getcred)(struct svc_req *, struct ucred **, int *)) 167 { 168 169 if (flavor == RPCSEC_GSS) { 170 _svcauth_rpcsec_gss = svcauth; 171 _svcauth_rpcsec_gss_getcred = getcred; 172 } 173 return (TRUE); 174 } 175 176 int 177 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp) 178 { 179 struct ucred *cr = NULL; 180 int flavor; 181 struct xucred *xcr; 182 SVCXPRT *xprt = rqst->rq_xprt; 183 184 flavor = rqst->rq_cred.oa_flavor; 185 if (flavorp) 186 *flavorp = flavor; 187 188 /* 189 * If there are credentials acquired via a TLS 190 * certificate for this TCP connection, use those 191 * instead of what is in the RPC header. 192 */ 193 if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER | 194 RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER && 195 flavor == AUTH_UNIX) { 196 cr = crget(); 197 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid; 198 crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp); 199 cr->cr_rgid = cr->cr_svgid = xprt->xp_gidp[0]; 200 cr->cr_prison = &prison0; 201 prison_hold(cr->cr_prison); 202 *crp = cr; 203 return (TRUE); 204 } 205 206 switch (flavor) { 207 case AUTH_UNIX: 208 xcr = (struct xucred *) rqst->rq_clntcred; 209 cr = crget(); 210 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid; 211 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups); 212 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; 213 cr->cr_prison = &prison0; 214 prison_hold(cr->cr_prison); 215 *crp = cr; 216 return (TRUE); 217 218 case RPCSEC_GSS: 219 if (!_svcauth_rpcsec_gss_getcred) 220 return (FALSE); 221 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp)); 222 223 default: 224 return (FALSE); 225 } 226 } 227 228