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/**
* FreeRDP: A Remote Desktop Protocol Implementation
* Generic Security Service Application Program Interface (GSSAPI)
*
* Copyright 2015 ANSSI, Author Thomas Calderon
* Copyright 2015 Marc-Andre Moreau <marcandre.moreau@gmail.com>
* Copyright 2017 Dorian Ducournau <dorian.ducournau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/endian.h>
#include <winpr/asn1.h>
#include <winpr/stream.h>
#include "sspi_gss.h"
BOOL sspi_gss_wrap_token(SecBuffer* buf, const WinPrAsn1_OID* oid, uint16_t tok_id,
const sspi_gss_data* token)
{
WinPrAsn1Encoder* enc = NULL;
BYTE tok_id_buf[2];
WinPrAsn1_MemoryChunk mc = { 2, tok_id_buf };
wStream s;
size_t len = 0;
BOOL ret = FALSE;
WINPR_ASSERT(buf);
WINPR_ASSERT(oid);
WINPR_ASSERT(token);
Data_Write_UINT16_BE(tok_id_buf, tok_id);
enc = WinPrAsn1Encoder_New(WINPR_ASN1_DER);
if (!enc)
return FALSE;
/* initialContextToken [APPLICATION 0] */
if (!WinPrAsn1EncAppContainer(enc, 0))
goto cleanup;
/* thisMech OID */
if (!WinPrAsn1EncOID(enc, oid))
goto cleanup;
/* TOK_ID */
if (!WinPrAsn1EncRawContent(enc, &mc))
goto cleanup;
/* innerToken */
mc.data = (BYTE*)token->data;
mc.len = token->length;
if (!WinPrAsn1EncRawContent(enc, &mc))
goto cleanup;
if (!WinPrAsn1EncEndContainer(enc))
goto cleanup;
if (!WinPrAsn1EncStreamSize(enc, &len) || len > buf->cbBuffer)
goto cleanup;
Stream_StaticInit(&s, buf->pvBuffer, len);
if (WinPrAsn1EncToStream(enc, &s))
{
buf->cbBuffer = len;
ret = TRUE;
}
cleanup:
WinPrAsn1Encoder_Free(&enc);
return ret;
}
BOOL sspi_gss_unwrap_token(const SecBuffer* buf, WinPrAsn1_OID* oid, uint16_t* tok_id,
sspi_gss_data* token)
{
WinPrAsn1Decoder dec;
WinPrAsn1Decoder dec2;
WinPrAsn1_tagId tag = 0;
wStream sbuffer = { 0 };
wStream* s = NULL;
WINPR_ASSERT(buf);
WINPR_ASSERT(oid);
WINPR_ASSERT(token);
WinPrAsn1Decoder_InitMem(&dec, WINPR_ASN1_DER, buf->pvBuffer, buf->cbBuffer);
if (!WinPrAsn1DecReadApp(&dec, &tag, &dec2) || tag != 0)
return FALSE;
if (!WinPrAsn1DecReadOID(&dec2, oid, FALSE))
return FALSE;
sbuffer = WinPrAsn1DecGetStream(&dec2);
s = &sbuffer;
if (Stream_Length(s) < 2)
return FALSE;
if (tok_id)
Stream_Read_INT16_BE(s, *tok_id);
token->data = Stream_Pointer(s);
token->length = (UINT)Stream_GetRemainingLength(s);
return TRUE;
}
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