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 #if defined(LIBC_SCCS) && !defined(lint) 32 static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro"; 33 static char *sccsid = "@(#)svc_auth_unix.c 2.3 88/08/01 4.0 RPCSRC"; 34 #endif 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 /* 39 * svc_auth_unix.c 40 * Handles UNIX flavor authentication parameters on the service side of rpc. 41 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 42 * _svcauth_unix does full blown unix style uid,gid+gids auth, 43 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 44 * Note: the shorthand has been gutted for efficiency. 45 * 46 * Copyright (C) 1984, Sun Microsystems, Inc. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/systm.h> 53 #include <sys/ucred.h> 54 55 #include <rpc/rpc.h> 56 57 #include <rpc/rpc_com.h> 58 59 #define MAX_MACHINE_NAME 255 60 #define NGRPS 16 61 62 /* 63 * Unix longhand authenticator 64 */ 65 enum auth_stat 66 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 67 { 68 enum auth_stat stat; 69 XDR xdrs; 70 int32_t *buf; 71 uint32_t time; 72 struct xucred *xcr; 73 u_int auth_len; 74 size_t str_len, gid_len; 75 u_int i; 76 77 xcr = rqst->rq_clntcred; 78 auth_len = (u_int)msg->rm_call.cb_cred.oa_length; 79 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, 80 XDR_DECODE); 81 buf = XDR_INLINE(&xdrs, auth_len); 82 if (buf != NULL) { 83 time = IXDR_GET_UINT32(buf); 84 str_len = (size_t)IXDR_GET_UINT32(buf); 85 if (str_len > MAX_MACHINE_NAME) { 86 stat = AUTH_BADCRED; 87 goto done; 88 } 89 str_len = RNDUP(str_len); 90 buf += str_len / sizeof (int32_t); 91 xcr->cr_uid = IXDR_GET_UINT32(buf); 92 xcr->cr_groups[0] = IXDR_GET_UINT32(buf); 93 gid_len = (size_t)IXDR_GET_UINT32(buf); 94 if (gid_len > NGRPS) { 95 stat = AUTH_BADCRED; 96 goto done; 97 } 98 for (i = 0; i < gid_len; i++) { 99 if (i + 1 < XU_NGROUPS) 100 xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf); 101 else 102 buf++; 103 } 104 if (gid_len + 1 > XU_NGROUPS) 105 xcr->cr_ngroups = XU_NGROUPS; 106 else 107 xcr->cr_ngroups = gid_len + 1; 108 109 /* 110 * five is the smallest unix credentials structure - 111 * timestamp, hostname len (0), uid, gid, and gids len (0). 112 */ 113 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) { 114 (void) printf("bad auth_len gid %ld str %ld auth %u\n", 115 (long)gid_len, (long)str_len, auth_len); 116 stat = AUTH_BADCRED; 117 goto done; 118 } 119 } else if (! xdr_authunix_parms(&xdrs, &time, xcr)) { 120 stat = AUTH_BADCRED; 121 goto done; 122 } 123 124 rqst->rq_verf = _null_auth; 125 stat = AUTH_OK; 126 done: 127 XDR_DESTROY(&xdrs); 128 129 return (stat); 130 } 131 132 133 /* 134 * Shorthand unix authenticator 135 * Looks up longhand in a cache. 136 */ 137 /*ARGSUSED*/ 138 enum auth_stat 139 _svcauth_short(rqst, msg) 140 struct svc_req *rqst; 141 struct rpc_msg *msg; 142 { 143 return (AUTH_REJECTEDCRED); 144 } 145