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
24
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
34
* Message protection services: determine maximum input size.
37
#include "gssapiP_eap.h"
39
OM_uint32 GSSAPI_CALLCONV
40
gss_wrap_size_limit(OM_uint32 *minor,
44
OM_uint32 req_output_size,
45
OM_uint32 *max_input_size)
47
gss_iov_buffer_desc iov[4];
48
OM_uint32 major, overhead;
50
if (ctx == GSS_C_NO_CONTEXT) {
52
return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
57
GSSEAP_MUTEX_LOCK(&ctx->mutex);
59
if (!CTX_IS_ESTABLISHED(ctx)) {
60
major = GSS_S_NO_CONTEXT;
61
*minor = GSSEAP_CONTEXT_INCOMPLETE;
65
iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
66
iov[0].buffer.value = NULL;
67
iov[0].buffer.length = 0;
69
iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
70
iov[1].buffer.length = req_output_size;
71
iov[1].buffer.value = NULL;
73
iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
74
iov[2].buffer.value = NULL;
75
iov[2].buffer.length = 0;
77
iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
78
iov[3].buffer.value = NULL;
79
iov[3].buffer.length = 0;
81
major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
86
overhead = iov[0].buffer.length + iov[3].buffer.length;
88
if (iov[2].buffer.length == 0 && overhead < req_output_size)
89
*max_input_size = req_output_size - overhead;
94
GSSEAP_MUTEX_UNLOCK(&ctx->mutex);