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 static char sccsid[] = "@(#)svc_auth.c 1.26 89/02/07 Copyr 1984 Sun Micro"; 38 #endif 39 #include <sys/cdefs.h> 40 /* 41 * svc_auth.c, Server-side rpc authenticator interface. 42 * 43 */ 44 45 #include <sys/param.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/proc.h> 49 #include <sys/systm.h> 50 #include <sys/jail.h> 51 #include <sys/ucred.h> 52 53 #include <rpc/rpc.h> 54 #include <rpc/rpcsec_tls.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 const 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-allocated; 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 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 97 return (AUTH_REJECTEDCRED); 98 dummy = _svcauth_unix(rqst, msg); 99 return (dummy); 100 case AUTH_SHORT: 101 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 102 return (AUTH_REJECTEDCRED); 103 dummy = _svcauth_short(rqst, msg); 104 return (dummy); 105 case RPCSEC_GSS: 106 if ((rqst->rq_xprt->xp_tls & RPCTLS_FLAGS_DISABLED) != 0) 107 return (AUTH_REJECTEDCRED); 108 if (!_svcauth_rpcsec_gss) 109 return (AUTH_REJECTEDCRED); 110 dummy = _svcauth_rpcsec_gss(rqst, msg); 111 return (dummy); 112 case AUTH_TLS: 113 dummy = _svcauth_rpcsec_tls(rqst, msg); 114 return (dummy); 115 default: 116 break; 117 } 118 119 return (AUTH_REJECTEDCRED); 120 } 121 122 /* 123 * A set of null auth methods used by any authentication protocols 124 * that don't need to inspect or modify the message body. 125 */ 126 static bool_t 127 svcauth_null_wrap(SVCAUTH *auth, struct mbuf **mp) 128 { 129 130 return (TRUE); 131 } 132 133 static bool_t 134 svcauth_null_unwrap(SVCAUTH *auth, struct mbuf **mp) 135 { 136 137 return (TRUE); 138 } 139 140 static void 141 svcauth_null_release(SVCAUTH *auth) 142 { 143 144 } 145 146 static const struct svc_auth_ops svc_auth_null_ops = { 147 .svc_ah_wrap = svcauth_null_wrap, 148 .svc_ah_unwrap = svcauth_null_unwrap, 149 .svc_ah_release = svcauth_null_release, 150 }; 151 152 /*ARGSUSED*/ 153 enum auth_stat 154 _svcauth_null(struct svc_req *rqst, struct rpc_msg *msg) 155 { 156 157 rqst->rq_verf = _null_auth; 158 return (AUTH_OK); 159 } 160 161 int 162 svc_auth_reg(int flavor, 163 enum auth_stat (*svcauth)(struct svc_req *, struct rpc_msg *), 164 int (*getcred)(struct svc_req *, struct ucred **, int *)) 165 { 166 167 if (flavor == RPCSEC_GSS) { 168 _svcauth_rpcsec_gss = svcauth; 169 _svcauth_rpcsec_gss_getcred = getcred; 170 } 171 return (TRUE); 172 } 173 174 int 175 svc_getcred(struct svc_req *rqst, struct ucred **crp, int *flavorp) 176 { 177 struct ucred *cr = NULL; 178 int flavor; 179 struct xucred *xcr; 180 SVCXPRT *xprt = rqst->rq_xprt; 181 182 flavor = rqst->rq_cred.oa_flavor; 183 if (flavorp) 184 *flavorp = flavor; 185 186 /* 187 * If there are credentials acquired via a TLS 188 * certificate for this TCP connection, use those 189 * instead of what is in the RPC header. 190 */ 191 if ((xprt->xp_tls & (RPCTLS_FLAGS_CERTUSER | 192 RPCTLS_FLAGS_DISABLED)) == RPCTLS_FLAGS_CERTUSER && 193 flavor == AUTH_UNIX) { 194 cr = crget(); 195 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xprt->xp_uid; 196 crsetgroups(cr, xprt->xp_ngrps, xprt->xp_gidp); 197 cr->cr_rgid = cr->cr_svgid = xprt->xp_gidp[0]; 198 cr->cr_prison = curthread->td_ucred->cr_prison; 199 prison_hold(cr->cr_prison); 200 *crp = cr; 201 return (TRUE); 202 } 203 204 switch (flavor) { 205 case AUTH_UNIX: 206 xcr = (struct xucred *) rqst->rq_clntcred; 207 cr = crget(); 208 cr->cr_uid = cr->cr_ruid = cr->cr_svuid = xcr->cr_uid; 209 crsetgroups(cr, xcr->cr_ngroups, xcr->cr_groups); 210 cr->cr_rgid = cr->cr_svgid = cr->cr_groups[0]; 211 cr->cr_prison = curthread->td_ucred->cr_prison; 212 prison_hold(cr->cr_prison); 213 *crp = cr; 214 return (TRUE); 215 216 case RPCSEC_GSS: 217 if (!_svcauth_rpcsec_gss_getcred) 218 return (FALSE); 219 return (_svcauth_rpcsec_gss_getcred(rqst, crp, flavorp)); 220 221 default: 222 return (FALSE); 223 } 224 } 225 226