1 /* $NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft 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 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro"; 35 static char *sccsid = "@(#)authunix_prot.c 2.1 88/07/29 4.0 RPCSRC"; 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * authunix_prot.c 42 * XDR for UNIX style authentication parameters for RPC 43 * 44 * Copyright (C) 1984, Sun Microsystems, Inc. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/jail.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/ucred.h> 52 53 #include <rpc/types.h> 54 #include <rpc/xdr.h> 55 #include <rpc/auth.h> 56 57 #include <rpc/rpc_com.h> 58 59 /* gids compose part of a credential; there may not be more than 16 of them */ 60 #define NGRPS 16 61 62 /* 63 * XDR for unix authentication parameters. 64 */ 65 bool_t 66 xdr_authunix_parms(XDR *xdrs, uint32_t *time, struct xucred *cred) 67 { 68 uint32_t namelen; 69 uint32_t ngroups, i; 70 uint32_t junk; 71 char hostbuf[MAXHOSTNAMELEN]; 72 73 if (xdrs->x_op == XDR_ENCODE) { 74 /* 75 * Restrict name length to 255 according to RFC 1057. 76 */ 77 getcredhostname(NULL, hostbuf, sizeof(hostbuf)); 78 namelen = strlen(hostbuf); 79 if (namelen > 255) 80 namelen = 255; 81 } else { 82 namelen = 0; 83 } 84 junk = 0; 85 86 if (!xdr_uint32_t(xdrs, time) 87 || !xdr_uint32_t(xdrs, &namelen)) 88 return (FALSE); 89 90 /* 91 * Ignore the hostname on decode. 92 */ 93 if (xdrs->x_op == XDR_ENCODE) { 94 if (!xdr_opaque(xdrs, hostbuf, namelen)) 95 return (FALSE); 96 } else { 97 xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen)); 98 } 99 100 if (!xdr_uint32_t(xdrs, &cred->cr_uid)) 101 return (FALSE); 102 if (!xdr_uint32_t(xdrs, &cred->cr_groups[0])) 103 return (FALSE); 104 105 if (xdrs->x_op == XDR_ENCODE) { 106 ngroups = cred->cr_ngroups - 1; 107 if (ngroups > NGRPS) 108 ngroups = NGRPS; 109 } 110 111 if (!xdr_uint32_t(xdrs, &ngroups)) 112 return (FALSE); 113 for (i = 0; i < ngroups; i++) { 114 if (i + 1 < ngroups_max + 1) { 115 if (!xdr_uint32_t(xdrs, &cred->cr_groups[i + 1])) 116 return (FALSE); 117 } else { 118 if (!xdr_uint32_t(xdrs, &junk)) 119 return (FALSE); 120 } 121 } 122 123 if (xdrs->x_op == XDR_DECODE) { 124 if (ngroups + 1 > ngroups_max + 1) 125 cred->cr_ngroups = ngroups_max + 1; 126 else 127 cred->cr_ngroups = ngroups + 1; 128 } 129 130 return (TRUE); 131 } 132