2 * Copyright (c) 2011, 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.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of JANET(UK) nor the names of its contributors
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
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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
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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
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47 * to distribution of the software without specific, written prior
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51 * M.I.T. makes no representations about the suitability of
52 * this software for any purpose. It is provided "as is" without express
53 * or implied warranty.
57 * Message protection services: determine protected message size.
60 #include "gssapiP_eap.h"
62 #define INIT_IOV_DATA(_iov) do { (_iov)->buffer.value = NULL; \
63 (_iov)->buffer.length = 0; } \
67 gssEapWrapIovLength(OM_uint32 *minor,
72 gss_iov_buffer_desc *iov,
74 enum gss_eap_token_type toktype)
76 gss_iov_buffer_t header, trailer, padding;
77 size_t dataLength, assocDataLength;
78 size_t gssHeaderLen, gssPadLen, gssTrailerLen;
79 size_t krbHeaderLen = 0, krbTrailerLen = 0, krbPadLen = 0;
81 krb5_context krbContext;
84 #ifdef HAVE_HEIMDAL_VERSION
85 krb5_crypto krbCrypto = NULL;
88 if (qop_req != GSS_C_QOP_DEFAULT) {
89 *minor = GSSEAP_UNKNOWN_QOP;
90 return GSS_S_UNAVAILABLE;
93 if (ctx->encryptionType == ENCTYPE_NULL) {
94 *minor = GSSEAP_KEY_UNAVAILABLE;
95 return GSS_S_UNAVAILABLE;
98 GSSEAP_KRB_INIT(&krbContext);
100 header = gssEapLocateHeaderIov(iov, iov_count, toktype);
101 if (header == NULL) {
102 *minor = GSSEAP_MISSING_IOV;
103 return GSS_S_FAILURE;
105 INIT_IOV_DATA(header);
107 trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
108 if (trailer != NULL) {
109 INIT_IOV_DATA(trailer);
112 /* MIC tokens and DCE-style wrap tokens have similar length considerations:
113 * no padding, and the framing surrounds the header only, not the data. */
114 dce_or_mic = ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0 ||
115 toktype == TOK_TYPE_MIC);
117 /* For CFX, EC is used instead of padding, and is placed in header or trailer */
118 padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
119 if (padding != NULL) {
120 INIT_IOV_DATA(padding);
123 gssEapIovMessageLength(iov, iov_count, &dataLength, &assocDataLength);
125 if (conf_req_flag && gssEapIsIntegrityOnly(iov, iov_count))
126 conf_req_flag = FALSE;
128 gssPadLen = gssTrailerLen = 0;
130 #ifdef HAVE_HEIMDAL_VERSION
131 code = krb5_crypto_init(krbContext, &ctx->rfc3961Key, ETYPE_NULL, &krbCrypto);
136 code = krbCryptoLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
138 KRB5_CRYPTO_TYPE_TRAILER : KRB5_CRYPTO_TYPE_CHECKSUM,
142 return GSS_S_FAILURE;
146 code = krbCryptoLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
147 KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
150 return GSS_S_FAILURE;
154 gssHeaderLen = 16; /* Header */
156 gssHeaderLen += krbHeaderLen; /* Kerb-Header */
157 gssTrailerLen = 16 /* E(Header) */ + krbTrailerLen; /* Kerb-Trailer */
159 code = krbPaddingLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
160 dataLength - assocDataLength + 16 /* E(Header) */,
164 return GSS_S_FAILURE;
167 if (krbPadLen == 0 && dce_or_mic) {
168 /* Windows rejects AEAD tokens with non-zero EC */
169 code = krbBlockSize(krbContext, KRB_CRYPTO_CONTEXT(ctx), &ec);
172 return GSS_S_FAILURE;
179 gssTrailerLen = krbTrailerLen; /* Kerb-Checksum */
182 dataLength += gssPadLen;
185 gssHeaderLen += gssTrailerLen;
187 trailer->buffer.length = gssTrailerLen;
189 GSSEAP_ASSERT(gssPadLen == 0 || padding != NULL);
192 padding->buffer.length = gssPadLen;
194 header->buffer.length = gssHeaderLen;
196 if (conf_state != NULL)
197 *conf_state = conf_req_flag;
200 return GSS_S_COMPLETE;
203 OM_uint32 GSSAPI_CALLCONV
204 gss_wrap_iov_length(OM_uint32 *minor,
209 gss_iov_buffer_desc *iov,
214 if (ctx == GSS_C_NO_CONTEXT) {
216 return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
221 GSSEAP_MUTEX_LOCK(&ctx->mutex);
223 if (!CTX_IS_ESTABLISHED(ctx)) {
224 major = GSS_S_NO_CONTEXT;
225 *minor = GSSEAP_CONTEXT_INCOMPLETE;
229 major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
230 conf_state, iov, iov_count, TOK_TYPE_WRAP);
231 if (GSS_ERROR(major))
235 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
240 OM_uint32 GSSAPI_CALLCONV
241 gss_get_mic_iov_length(OM_uint32 *minor,
244 gss_iov_buffer_desc *iov,
250 if (ctx == GSS_C_NO_CONTEXT) {
252 return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
257 GSSEAP_MUTEX_LOCK(&ctx->mutex);
259 if (!CTX_IS_ESTABLISHED(ctx)) {
260 major = GSS_S_NO_CONTEXT;
261 *minor = GSSEAP_CONTEXT_INCOMPLETE;
265 major = gssEapWrapIovLength(minor, ctx, FALSE, qop_req,
266 &conf_state, iov, iov_count, TOK_TYPE_MIC);
267 if (GSS_ERROR(major))
271 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);