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