1 /* 2 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * Copyright 2000 by the Massachusetts Institute of Technology. 10 * All Rights Reserved. 11 * 12 * Export of this software from the United States of America may 13 * require a specific license from the United States Government. 14 * It is the responsibility of any person or organization contemplating 15 * export to obtain such a license before exporting. 16 * 17 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 18 * distribute this software and its documentation for any purpose and 19 * without fee is hereby granted, provided that the above copyright 20 * notice appear in all copies and that both that copyright notice and 21 * this permission notice appear in supporting documentation, and that 22 * the name of M.I.T. not be used in advertising or publicity pertaining 23 * to distribution of the software without specific, written prior 24 * permission. Furthermore if you modify this software you must label 25 * your software as modified software and not distribute it in such a 26 * fashion that it might be confused with the original M.I.T. software. 27 * M.I.T. makes no representations about the suitability of 28 * this software for any purpose. It is provided "as is" without express 29 * or implied warranty. 30 * 31 */ 32 /* 33 * Copyright 1993 by OpenVision Technologies, Inc. 34 * 35 * Permission to use, copy, modify, distribute, and sell this software 36 * and its documentation for any purpose is hereby granted without fee, 37 * provided that the above copyright notice appears in all copies and 38 * that both that copyright notice and this permission notice appear in 39 * supporting documentation, and that the name of OpenVision not be used 40 * in advertising or publicity pertaining to distribution of the software 41 * without specific, written prior permission. OpenVision makes no 42 * representations about the suitability of this software for any 43 * purpose. It is provided "as is" without express or implied warranty. 44 * 45 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 46 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 47 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR 48 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 49 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 50 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 51 * PERFORMANCE OF THIS SOFTWARE. 52 */ 53 54 /* 55 * Copyright (C) 1998 by the FundsXpress, INC. 56 * 57 * All rights reserved. 58 * 59 * Export of this software from the United States of America may require 60 * a specific license from the United States Government. It is the 61 * responsibility of any person or organization contemplating export to 62 * obtain such a license before exporting. 63 * 64 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 65 * distribute this software and its documentation for any purpose and 66 * without fee is hereby granted, provided that the above copyright 67 * notice appear in all copies and that both that copyright notice and 68 * this permission notice appear in supporting documentation, and that 69 * the name of FundsXpress. not be used in advertising or publicity pertaining 70 * to distribution of the software without specific, written prior 71 * permission. FundsXpress makes no representations about the suitability of 72 * this software for any purpose. It is provided "as is" without express 73 * or implied warranty. 74 * 75 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 76 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 77 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 78 */ 79 80 #include "gssapiP_krb5.h" 81 82 size_t KRB5_CALLCONV krb5_encrypt_size(size_t, krb5_enctype); 83 84 /* SUNW15resync - XXX find new home for this func */ 85 #ifdef _KERNEL 86 size_t KRB5_CALLCONV 87 krb5_encrypt_size(size_t length, krb5_enctype crypto) 88 { 89 size_t ret; 90 91 if (krb5_c_encrypt_length(/* XXX */ 0, crypto, length, &ret)) 92 /*LINTED*/ 93 return(-1); /* XXX */ 94 95 return(ret); 96 } 97 #endif 98 99 /* V2 interface */ 100 OM_uint32 101 krb5_gss_wrap_size_limit(minor_status, context_handle, conf_req_flag, 102 qop_req, req_output_size, max_input_size) 103 OM_uint32 *minor_status; 104 gss_ctx_id_t context_handle; 105 int conf_req_flag; 106 gss_qop_t qop_req; 107 OM_uint32 req_output_size; 108 OM_uint32 *max_input_size; 109 { 110 krb5_gss_ctx_id_rec *ctx; 111 OM_uint32 data_size, conflen; 112 OM_uint32 ohlen; 113 int overhead; 114 115 /* Solaris Kerb - check to make sure we aren't writing to a NULL pointer */ 116 if (!max_input_size) 117 return(GSS_S_CALL_INACCESSIBLE_WRITE); 118 119 /* only default qop is allowed */ 120 /* 121 * SUNW15resync 122 * mit 1.2-6: if (qop_req != GSS_C_QOP_DEFAULT) { 123 * Go with Solaris version here, though not sure which is 124 * correct and RFC 2743 does not make it clear. 125 */ 126 if ((qop_req & GSS_KRB5_CONF_C_QOP_MASK) != GSS_C_QOP_DEFAULT) { 127 *minor_status = (OM_uint32) G_UNKNOWN_QOP; 128 /* SUNW15resync - RFC 2743 is clear here but 129 this is still GSS_S_FAILURE in MIT */ 130 return(GSS_S_BAD_QOP); 131 } 132 133 /* validate the context handle */ 134 if (! kg_validate_ctx_id(context_handle)) { 135 *minor_status = (OM_uint32) G_VALIDATE_FAILED; 136 return(GSS_S_NO_CONTEXT); 137 } 138 139 ctx = (krb5_gss_ctx_id_rec *) context_handle; 140 if (! ctx->established) { 141 *minor_status = KG_CTX_INCOMPLETE; 142 return(GSS_S_NO_CONTEXT); 143 } 144 145 if (ctx->proto == 1) { 146 /* No pseudo-ASN.1 wrapper overhead, so no sequence length and 147 OID. */ 148 OM_uint32 sz = req_output_size; 149 /* Token header: 16 octets. */ 150 if (conf_req_flag) { 151 while (sz > 0 && krb5_encrypt_size(sz, ctx->enc->enctype) + 16 > req_output_size) 152 sz--; 153 /* Allow for encrypted copy of header. */ 154 if (sz > 16) 155 sz -= 16; 156 else 157 sz = 0; 158 #ifdef CFX_EXERCISE 159 /* Allow for EC padding. In the MIT implementation, only 160 added while testing. */ 161 if (sz > 65535) 162 sz -= 65535; 163 else 164 sz = 0; 165 #endif 166 } else { 167 /* Allow for token header and checksum. */ 168 if (sz < 16 + ctx->cksum_size) 169 sz = 0; 170 else 171 sz -= (16 + ctx->cksum_size); 172 } 173 174 *max_input_size = sz; 175 *minor_status = 0; 176 return GSS_S_COMPLETE; 177 } 178 179 /* Calculate the token size and subtract that from the output size */ 180 overhead = 7 + ctx->mech_used->length; 181 data_size = req_output_size; 182 conflen = kg_confounder_size(ctx->k5_context, ctx->enc); 183 data_size = (conflen + data_size + 8) & (~(OM_uint32)7); 184 ohlen = g_token_size(ctx->mech_used, 185 (unsigned int) (data_size + ctx->cksum_size + 14)) 186 - req_output_size; 187 188 if (ohlen+overhead < req_output_size) 189 /* 190 * Cannot have trailer length that will cause us to pad over our 191 * length. 192 */ 193 *max_input_size = (req_output_size - ohlen - overhead) & (~(OM_uint32)7); 194 else 195 *max_input_size = 0; 196 197 *minor_status = 0; 198 return(GSS_S_COMPLETE); 199 } 200