1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 /* 32 * svc_auth_unix.c 33 * Handles UNIX flavor authentication parameters on the service side of rpc. 34 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 35 * _svcauth_unix does full blown unix style uid,gid+gids auth, 36 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 37 * Note: the shorthand has been gutted for efficiency. 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 */ 41 42 #include "namespace.h" 43 #include <assert.h> 44 #include <stdio.h> 45 #include <string.h> 46 47 #include <rpc/rpc.h> 48 #include "un-namespace.h" 49 50 /* 51 * Unix longhand authenticator 52 */ 53 enum auth_stat 54 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 55 { 56 enum auth_stat stat; 57 XDR xdrs; 58 struct authunix_parms *aup; 59 int32_t *buf; 60 struct area { 61 struct authunix_parms area_aup; 62 char area_machname[MAX_MACHINE_NAME+1]; 63 u_int area_gids[NGRPS]; 64 } *area; 65 u_int auth_len; 66 size_t str_len, gid_len; 67 u_int i; 68 69 assert(rqst != NULL); 70 assert(msg != NULL); 71 72 area = (struct area *) rqst->rq_clntcred; 73 aup = &area->area_aup; 74 aup->aup_machname = area->area_machname; 75 aup->aup_gids = area->area_gids; 76 auth_len = (u_int)msg->rm_call.cb_cred.oa_length; 77 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE); 78 buf = XDR_INLINE(&xdrs, auth_len); 79 if (buf != NULL) { 80 aup->aup_time = IXDR_GET_INT32(buf); 81 str_len = (size_t)IXDR_GET_U_INT32(buf); 82 if (str_len > MAX_MACHINE_NAME) { 83 stat = AUTH_BADCRED; 84 goto done; 85 } 86 memmove(aup->aup_machname, buf, str_len); 87 aup->aup_machname[str_len] = 0; 88 str_len = RNDUP(str_len); 89 buf += str_len / sizeof (int32_t); 90 aup->aup_uid = (int)IXDR_GET_INT32(buf); 91 aup->aup_gid = (int)IXDR_GET_INT32(buf); 92 gid_len = (size_t)IXDR_GET_U_INT32(buf); 93 if (gid_len > NGRPS) { 94 stat = AUTH_BADCRED; 95 goto done; 96 } 97 aup->aup_len = gid_len; 98 for (i = 0; i < gid_len; i++) { 99 aup->aup_gids[i] = (int)IXDR_GET_INT32(buf); 100 } 101 /* 102 * five is the smallest unix credentials structure - 103 * timestamp, hostname len (0), uid, gid, and gids len (0). 104 */ 105 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) { 106 (void) printf("bad auth_len gid %ld str %ld auth %u\n", 107 (long)gid_len, (long)str_len, auth_len); 108 stat = AUTH_BADCRED; 109 goto done; 110 } 111 } else if (! xdr_authunix_parms(&xdrs, aup)) { 112 xdrs.x_op = XDR_FREE; 113 (void)xdr_authunix_parms(&xdrs, aup); 114 stat = AUTH_BADCRED; 115 goto done; 116 } 117 118 /* get the verifier */ 119 if ((u_int)msg->rm_call.cb_verf.oa_length) { 120 rqst->rq_xprt->xp_verf.oa_flavor = 121 msg->rm_call.cb_verf.oa_flavor; 122 rqst->rq_xprt->xp_verf.oa_base = 123 msg->rm_call.cb_verf.oa_base; 124 rqst->rq_xprt->xp_verf.oa_length = 125 msg->rm_call.cb_verf.oa_length; 126 } else { 127 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL; 128 rqst->rq_xprt->xp_verf.oa_length = 0; 129 } 130 stat = AUTH_OK; 131 done: 132 XDR_DESTROY(&xdrs); 133 return (stat); 134 } 135 136 137 /* 138 * Shorthand unix authenticator 139 * Looks up longhand in a cache. 140 */ 141 /*ARGSUSED*/ 142 enum auth_stat 143 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg) 144 { 145 return (AUTH_REJECTEDCRED); 146 } 147