1 /* $NetBSD: authunix_prot.c,v 1.12 2000/01/22 22:19:17 mycroft Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char *sccsid2 = "@(#)authunix_prot.c 1.15 87/08/11 Copyr 1984 Sun Micro"; 34 static char *sccsid = "@(#)authunix_prot.c 2.1 88/07/29 4.0 RPCSRC"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * authunix_prot.c 41 * XDR for UNIX style authentication parameters for RPC 42 * 43 * Copyright (C) 1984, Sun Microsystems, Inc. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.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 72 mtx_lock(&hostname_mtx); 73 if (xdrs->x_op == XDR_ENCODE) { 74 /* 75 * Restrict name length to 255 according to RFC 1057. 76 */ 77 namelen = strlen(hostname); 78 if (namelen > 255) 79 namelen = 255; 80 } else { 81 namelen = 0; 82 } 83 junk = 0; 84 85 if (!xdr_uint32_t(xdrs, time) 86 || !xdr_uint32_t(xdrs, &namelen)) 87 return (FALSE); 88 89 /* 90 * Ignore the hostname on decode. 91 */ 92 if (xdrs->x_op == XDR_ENCODE) { 93 if (!xdr_opaque(xdrs, hostname, namelen)) 94 return (FALSE); 95 } else { 96 xdr_setpos(xdrs, xdr_getpos(xdrs) + RNDUP(namelen)); 97 } 98 mtx_unlock(&hostname_mtx); 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) { 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) 125 cred->cr_ngroups = NGROUPS; 126 else 127 cred->cr_ngroups = ngroups + 1; 128 } 129 130 return (TRUE); 131 } 132