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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 <unistd.h>
#include "qpid/sys/cyrus/CyrusSecurityLayer.h"
#include <algorithm>
#include "qpid/framing/reply_exceptions.h"
#include "qpid/log/Statement.h"
#include <string.h>
namespace qpid {
namespace sys {
namespace cyrus {
CyrusSecurityLayer::CyrusSecurityLayer(sasl_conn_t* c, uint16_t maxFrameSize) :
conn(c), decrypted(0), decryptedSize(0), encrypted(0), encryptedSize(0), codec(0), maxInputSize(0),
decodeBuffer(maxFrameSize), encodeBuffer(maxFrameSize), encoded(0)
{
const void* value(0);
int result = sasl_getprop(conn, SASL_MAXOUTBUF, &value);
if (result != SASL_OK) {
throw framing::InternalErrorException(QPID_MSG("SASL encode error: " << sasl_errdetail(conn)));
}
maxInputSize = *(reinterpret_cast<const unsigned*>(value));
}
size_t CyrusSecurityLayer::decode(const char* input, size_t size)
{
size_t inStart = 0;
do {
size_t inSize = std::min(size - inStart, maxInputSize);
int result = sasl_decode(conn, input + inStart, inSize, &decrypted, &decryptedSize);
if (result != SASL_OK) {
throw framing::InternalErrorException(QPID_MSG("SASL decode error: " << sasl_errdetail(conn)));
}
inStart += inSize;
size_t copied = 0;
do {
size_t count = std::min(decryptedSize - copied, decodeBuffer.size - decodeBuffer.position);
::memcpy(decodeBuffer.data + decodeBuffer.position, decrypted + copied, count);
copied += count;
decodeBuffer.position += count;
size_t decodedSize = codec->decode(decodeBuffer.data, decodeBuffer.position);
if (decodedSize == 0) break;
if (decodedSize < decodeBuffer.position) {
::memmove(decodeBuffer.data, decodeBuffer.data + decodedSize, decodeBuffer.position - decodedSize);
}
decodeBuffer.position -= decodedSize;
} while (copied < decryptedSize);
} while (inStart < size);
return size;
}
size_t CyrusSecurityLayer::encode(const char* buffer, size_t size)
{
size_t processed = 0;//records how many bytes have been written to buffer
do {
if (!encrypted) {
if (!encoded) {
encodeBuffer.position = 0;
encoded = codec->encode(encodeBuffer.data, encodeBuffer.size);
if (!encoded) break;//nothing more to do
}
size_t encryptable = std::min(encoded, maxInputSize);
int result = sasl_encode(conn, encodeBuffer.data + encodeBuffer.position, encryptable, &encrypted, &encryptedSize);
if (result != SASL_OK) {
throw framing::InternalErrorException(QPID_MSG("SASL encode error: " << sasl_errdetail(conn)));
}
encodeBuffer.position += encryptable;
encoded -= encryptable;
}
size_t remaining = size - processed;
if (remaining < encryptedSize) {
//can't fit all encrypted data in the buffer we've
//been given, copy in what we can and hold on to the
//rest until the next call
::memcpy(const_cast<char*>(buffer + processed), encrypted, remaining);
processed += remaining;
encrypted += remaining;
encryptedSize -= remaining;
} else {
::memcpy(const_cast<char*>(buffer + processed), encrypted, encryptedSize);
processed += encryptedSize;
encrypted = 0;
encryptedSize = 0;
}
} while (processed < size);
return processed;
}
bool CyrusSecurityLayer::canEncode()
{
return codec && (encrypted || codec->canEncode());
}
void CyrusSecurityLayer::init(qpid::sys::Codec* c)
{
codec = c;
}
CyrusSecurityLayer::DataBuffer::DataBuffer(size_t s) : position(0), size(s)
{
data = new char[size];
}
CyrusSecurityLayer::DataBuffer::~DataBuffer()
{
delete[] data;
}
}}} // namespace qpid::sys::cyrus
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