2 * Copyright (c) 2010, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
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17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
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
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23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Copyright 2008 by the Massachusetts Institute of Technology.
34 * All Rights Reserved.
36 * Export of this software from the United States of America may
37 * require a specific license from the United States Government.
38 * It is the responsibility of any person or organization contemplating
39 * export to obtain such a license before exporting.
41 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
42 * distribute this software and its documentation for any purpose and
43 * without fee is hereby granted, provided that the above copyright
44 * notice appear in all copies and that both that copyright notice and
45 * this permission notice appear in supporting documentation, and that
46 * the name of M.I.T. not be used in advertising or publicity pertaining
47 * to distribution of the software without specific, written prior
48 * permission. Furthermore if you modify this software you must label
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51 * M.I.T. makes no representations about the suitability of
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53 * or implied warranty.
56 #include "gssapiP_eap.h"
58 #define INIT_IOV_DATA(_iov) do { (_iov)->buffer.value = NULL; \
59 (_iov)->buffer.length = 0; } \
63 gss_wrap_iov_length(OM_uint32 *minor,
68 gss_iov_buffer_desc *iov,
71 gss_iov_buffer_t header, trailer, padding;
72 size_t dataLength, assocDataLength;
73 size_t gssHeaderLen, gssPadLen, gssTrailerLen;
74 unsigned int krbHeaderLen = 0, krbTrailerLen = 0, krbPadLen = 0;
76 krb5_context krbContext;
80 if (qop_req != GSS_C_QOP_DEFAULT)
83 if (!CTX_IS_ESTABLISHED(ctx))
84 return GSS_S_NO_CONTEXT;
86 GSSEAP_KRB_INIT(&krbContext);
88 header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
93 INIT_IOV_DATA(header);
95 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
96 if (trailer != NULL) {
97 INIT_IOV_DATA(trailer);
100 dce_style = ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0);
102 /* For CFX, EC is used instead of padding, and is placed in header or trailer */
103 padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
104 if (padding != NULL) {
105 INIT_IOV_DATA(padding);
108 gssEapIovMessageLength(iov, iov_count, &dataLength, &assocDataLength);
110 if (conf_req_flag && gssEapIsIntegrityOnly(iov, iov_count))
111 conf_req_flag = FALSE;
113 gssHeaderLen = gssPadLen = gssTrailerLen = 0;
115 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
117 KRB5_CRYPTO_TYPE_TRAILER : KRB5_CRYPTO_TYPE_CHECKSUM,
121 return GSS_S_FAILURE;
125 code = krb5_c_crypto_length(krbContext, ctx->encryptionType,
126 KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
129 return GSS_S_FAILURE;
133 gssHeaderLen = 16; /* Header */
135 gssHeaderLen += krbHeaderLen; /* Kerb-Header */
136 gssTrailerLen = 16 /* E(Header) */ + krbTrailerLen; /* Kerb-Trailer */
138 code = krb5_c_padding_length(krbContext, ctx->encryptionType,
139 dataLength - assocDataLength + 16 /* E(Header) */,
143 return GSS_S_FAILURE;
146 if (krbPadLen == 0 && dce_style) {
147 /* Windows rejects AEAD tokens with non-zero EC */
148 code = krb5_c_block_size(krbContext, ctx->encryptionType, &ec);
151 return GSS_S_FAILURE;
158 gssTrailerLen = krbTrailerLen; /* Kerb-Checksum */
161 dataLength += gssPadLen;
164 gssHeaderLen += gssTrailerLen;
166 trailer->buffer.length = gssTrailerLen;
168 assert(gssPadLen == 0 || padding != NULL);
171 padding->buffer.length = gssPadLen;
173 header->buffer.length = gssHeaderLen;
175 if (conf_state != NULL)
176 *conf_state = conf_req_flag;
179 return GSS_S_COMPLETE;