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SChannelConnection.cpp
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475 lines (400 loc) · 12.6 KB
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#define SECURITY_WIN32
#define NOMINMAX
#include "SChannelConnection.h"
#ifdef HTTPS_BACKEND_SCHANNEL
#include <windows.h>
#include <security.h>
#include <schnlsp.h>
#include <assert.h>
#include <algorithm>
#include <memory>
#include <array>
#ifndef SCH_USE_STRONG_CRYPTO
# define SCH_USE_STRONG_CRYPTO 0x00400000
#endif
#ifndef SP_PROT_TLS1_1_CLIENT
# define SP_PROT_TLS1_1_CLIENT 0x00000200
#endif
#ifndef SP_PROT_TLS1_2_CLIENT
# define SP_PROT_TLS1_2_CLIENT 0x00000800
#endif
#ifdef DEBUG_SCHANNEL
#include <iostream>
std::ostream &debug = std::cout;
#else
struct Debug
{
template<typename T>
Debug &operator<<(const T&) { return *this; }
} debug;
#endif
static void enqueue(std::vector<char> &buffer, char *data, size_t size)
{
size_t oldSize = buffer.size();
buffer.resize(oldSize + size);
memcpy(&buffer[oldSize], data, size);
}
static void enqueue_prepend(std::vector<char> &buffer, char *data, size_t size)
{
size_t oldSize = buffer.size();
buffer.resize(oldSize + size);
if (oldSize > 0)
memmove(&buffer[size], &buffer[0], oldSize);
memcpy(&buffer[0], data, size);
}
static size_t dequeue(std::vector<char> &buffer, char *data, size_t size)
{
size = std::min(size, buffer.size());
size_t remaining = buffer.size() - size;
memcpy(data, &buffer[0], size);
if (remaining > 0)
{
memmove(&buffer[0], &buffer[size], remaining);
buffer.resize(remaining);
}
else
{
buffer.resize(0);
}
return size;
}
SChannelConnection::SChannelConnection()
: context(nullptr)
{
}
SChannelConnection::~SChannelConnection()
{
destroyContext();
}
SECURITY_STATUS InitializeSecurityContext(CredHandle *phCredential, std::unique_ptr<CtxtHandle>& phContext, const std::string& szTargetName, ULONG fContextReq, std::vector<char>& inputBuffer, std::vector<char>& outputBuffer, ULONG *pfContextAttr)
{
std::array<SecBuffer, 1> recvBuffers;
recvBuffers[0].BufferType = SECBUFFER_TOKEN;
recvBuffers[0].pvBuffer = outputBuffer.data();
recvBuffers[0].cbBuffer = outputBuffer.size();
std::array<SecBuffer, 2> sendBuffers;
sendBuffers[0].BufferType = SECBUFFER_TOKEN;
sendBuffers[0].pvBuffer = inputBuffer.data();
sendBuffers[0].cbBuffer = inputBuffer.size();
sendBuffers[1].BufferType = SECBUFFER_EMPTY;
sendBuffers[1].pvBuffer = nullptr;
sendBuffers[1].cbBuffer = 0;
SecBufferDesc recvBufferDesc, sendBufferDesc;
recvBufferDesc.ulVersion = sendBufferDesc.ulVersion = SECBUFFER_VERSION;
recvBufferDesc.pBuffers = &recvBuffers[0];
recvBufferDesc.cBuffers = recvBuffers.size();
if (!inputBuffer.empty())
{
sendBufferDesc.pBuffers = &sendBuffers[0];
sendBufferDesc.cBuffers = sendBuffers.size();
}
else
{
sendBufferDesc.pBuffers = nullptr;
sendBufferDesc.cBuffers = 0;
}
CtxtHandle* phOldContext = nullptr;
CtxtHandle* phNewContext = nullptr;
if (!phContext)
{
phContext = std::make_unique<CtxtHandle>();
phNewContext = phContext.get();
}
else
{
phOldContext = phContext.get();
}
auto ret = InitializeSecurityContext(phCredential, phOldContext, const_cast<char*>(szTargetName.c_str()), fContextReq, 0, 0, &sendBufferDesc, 0, phNewContext, &recvBufferDesc, pfContextAttr, nullptr);
outputBuffer.resize(recvBuffers[0].cbBuffer);
// Clear the input buffer, so the reader can append
// If we have unprocessed data, leave it in the buffer
size_t unprocessed = 0;
if (sendBuffers[1].BufferType == SECBUFFER_EXTRA)
unprocessed = sendBuffers[1].cbBuffer;
if (unprocessed > 0)
memmove(inputBuffer.data(), inputBuffer.data() + inputBuffer.size() - unprocessed, unprocessed);
inputBuffer.resize(unprocessed);
return ret;
}
bool SChannelConnection::connect(const std::string &hostname, uint16_t port)
{
debug << "Trying to connect to " << hostname << ":" << port << "\n";
if (!socket.connect(hostname, port))
return false;
debug << "Connected\n";
SCHANNEL_CRED cred;
memset(&cred, 0, sizeof(cred));
cred.dwVersion = SCHANNEL_CRED_VERSION;
cred.grbitEnabledProtocols = SP_PROT_TLS1_CLIENT | SP_PROT_TLS1_1_CLIENT | SP_PROT_TLS1_2_CLIENT;
cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION | SCH_CRED_NO_DEFAULT_CREDS | SCH_USE_STRONG_CRYPTO | SCH_CRED_REVOCATION_CHECK_CHAIN;
CredHandle credHandle;
if (AcquireCredentialsHandle(nullptr, (char*) UNISP_NAME, SECPKG_CRED_OUTBOUND, nullptr, &cred, nullptr, nullptr, &credHandle, nullptr) != SEC_E_OK)
{
debug << "Failed to acquire handle\n";
socket.close();
return false;
}
debug << "Acquired handle\n";
static constexpr size_t bufferSize = 8192;
bool done = false, success = false, contextCreated = false;
ULONG contextAttr;
std::unique_ptr<CtxtHandle> context;
std::vector<char> inputBuffer;
std::vector<char> outputBuffer;
do
{
outputBuffer.resize(bufferSize);
bool recvData = false;
bool sendData = false;
auto ret = InitializeSecurityContext(&credHandle, context, hostname, ISC_REQ_STREAM, inputBuffer, outputBuffer, &contextAttr);
switch (ret)
{
/*case SEC_I_COMPLETE_NEEDED:
case SEC_I_COMPLETE_AND_CONTINUE:
if (CompleteAuthToken(context.get(), &outputBuffer) != SEC_E_OK)
done = true;
else if (ret == SEC_I_COMPLETE_NEEDED)
success = done = true;
break;*/
case SEC_I_CONTINUE_NEEDED:
debug << "Initialize: continue needed\n";
recvData = true;
sendData = true;
break;
case SEC_E_INCOMPLETE_CREDENTIALS:
debug << "Initialize failed: incomplete credentials\n";
done = true;
break;
case SEC_E_INCOMPLETE_MESSAGE:
debug << "Initialize: incomplete message\n";
recvData = true;
break;
case SEC_E_OK:
debug << "Initialize succeeded\n";
success = done = true;
sendData = true;
break;
default:
debug << "Initialize done: " << outputBuffer.size() << " bytes of output and unknown status " << ret << "\n";
done = true;
success = false;
break;
}
if (!done)
contextCreated = true;
if (sendData && !outputBuffer.empty())
{
socket.write(outputBuffer.data(), outputBuffer.size());
debug << "Sent " << outputBuffer.size() << " bytes of data\n";
}
if (recvData)
{
size_t unprocessed = inputBuffer.size();
inputBuffer.resize(unprocessed + bufferSize);
size_t actual = socket.read(inputBuffer.data() + unprocessed, bufferSize);
inputBuffer.resize(actual + unprocessed);
debug << "Received " << actual << " bytes of data\n";
if (unprocessed > 0)
debug << " had " << unprocessed << " bytes of remaining, unprocessed data\n";
if (actual + unprocessed == 0)
{
debug << "No data to submit, break\n";
break;
}
}
} while (!done);
debug << "Done!\n";
if (success)
{
SecPkgContext_Flags resultFlags;
QueryContextAttributes(context.get(), SECPKG_ATTR_FLAGS, &resultFlags);
if (resultFlags.Flags & ISC_REQ_CONFIDENTIALITY == 0)
{
debug << "Resulting context is not encrypted, marking as failed\n";
success = false;
}
if (resultFlags.Flags & ISC_REQ_INTEGRITY == 0)
{
debug << "Resulting context is not signed, marking as failed\n";
success = false;
}
}
if (success)
this->context = context.release();
else if (contextCreated)
DeleteSecurityContext(context.get());
return success;
}
size_t SChannelConnection::read(char *buffer, size_t size)
{
if (decRecvBuffer.size() > 0)
{
size = dequeue(decRecvBuffer, buffer, size);
debug << "Read " << size << " bytes of previously decoded data\n";
return size;
}
else if (encRecvBuffer.size() > 0)
{
size = dequeue(encRecvBuffer, buffer, size);
debug << "Read " << size << " bytes of extra data\n";
}
else
{
size = socket.read(buffer, size);
debug << "Received " << size << " bytes of data\n";
}
return decrypt(buffer, size);
}
size_t SChannelConnection::decrypt(char *buffer, size_t size, bool recurse)
{
if (size == 0)
return 0;
SecBuffer secBuffers[4];
secBuffers[0].cbBuffer = size;
secBuffers[0].BufferType = SECBUFFER_DATA;
secBuffers[0].pvBuffer = buffer;
for (size_t i = 1; i < 4; ++i)
{
secBuffers[i].BufferType = SECBUFFER_EMPTY;
secBuffers[i].pvBuffer = nullptr;
secBuffers[i].cbBuffer = 0;
}
SecBufferDesc secBufferDesc;
secBufferDesc.ulVersion = SECBUFFER_VERSION;
secBufferDesc.cBuffers = 4;
secBufferDesc.pBuffers = &secBuffers[0];
auto ret = DecryptMessage(static_cast<CtxtHandle*>(context), &secBufferDesc, 0, nullptr); // FIXME
debug << "DecryptMessage returns: " << ret << "\n";
switch (ret)
{
case SEC_E_OK:
{
void *actualDataStart = buffer;
for (size_t i = 0; i < 4; ++i)
{
auto &buffer = secBuffers[i];
if (buffer.BufferType == SECBUFFER_DATA)
{
actualDataStart = buffer.pvBuffer;
size = buffer.cbBuffer;
}
else if (buffer.BufferType == SECBUFFER_EXTRA)
{
debug << "\tExtra data in buffer " << i << " (" << buffer.cbBuffer << " bytes)\n";
enqueue(encRecvBuffer, static_cast<char*>(buffer.pvBuffer), buffer.cbBuffer);
}
else if (buffer.BufferType != SECBUFFER_EMPTY)
debug << "\tBuffer of type " << buffer.BufferType << "\n";
}
if (actualDataStart)
memmove(buffer, actualDataStart, size);
break;
}
case SEC_E_INCOMPLETE_MESSAGE:
{
// Move all our current data to encRecvBuffer
enqueue(encRecvBuffer, buffer, size);
// Now try to read some more data from the socket
size_t bufferSize = encRecvBuffer.size() + 8192;
char *recvBuffer = new char[bufferSize];
size_t recvd = socket.read(recvBuffer+encRecvBuffer.size(), 8192);
debug << recvd << " bytes of extra data read from socket\n";
if (recvd == 0 && !recurse)
{
debug << "Recursion prevented, bailing\n";
return 0;
}
// Fill our buffer with the queued data and the newly received data
size_t totalSize = encRecvBuffer.size() + recvd;
dequeue(encRecvBuffer, recvBuffer, encRecvBuffer.size());
debug << "Trying to decrypt with " << totalSize << " bytes of data\n";
// Now try to decrypt that
size_t decrypted = decrypt(recvBuffer, totalSize, false);
debug << "\tObtained " << decrypted << " bytes of decrypted data\n";
// Copy the first size bytes to the output buffer
size = std::min(size, decrypted);
memcpy(buffer, recvBuffer, size);
// And write the remainder to our queued decrypted data...
// Note: we prepend, since our recursive call may already have written
// something and we can be sure decrypt wasn't called if the buffer was
// non-empty in read
enqueue_prepend(decRecvBuffer, recvBuffer+size, decrypted-size);
debug << "\tStoring " << decrypted-size << " bytes of extra decrypted data\n";
return size;
}
// TODO: More?
default:
size = 0;
break;
}
debug << "\tDecrypted " << size << " bytes of data\n";
return size;
}
size_t SChannelConnection::write(const char *buffer, size_t size)
{
static constexpr size_t bufferSize = 8192;
assert(size <= bufferSize);
SecPkgContext_StreamSizes Sizes;
QueryContextAttributes(
static_cast<CtxtHandle*>(context),
SECPKG_ATTR_STREAM_SIZES,
&Sizes);
debug << "stream sizes:\n\theader: " << Sizes.cbHeader << "\n\tfooter: " << Sizes.cbTrailer << "\n";
char *sendBuffer = new char[bufferSize + Sizes.cbHeader + Sizes.cbTrailer];
memcpy(sendBuffer+Sizes.cbHeader, buffer, size);
SecBuffer secBuffers[4];
secBuffers[0].cbBuffer = Sizes.cbHeader;
secBuffers[0].BufferType = SECBUFFER_STREAM_HEADER;
secBuffers[0].pvBuffer = sendBuffer;
secBuffers[1].cbBuffer = size;
secBuffers[1].BufferType = SECBUFFER_DATA;
secBuffers[1].pvBuffer = sendBuffer+Sizes.cbHeader;
secBuffers[2].cbBuffer = Sizes.cbTrailer;
secBuffers[2].pvBuffer = sendBuffer+Sizes.cbHeader+size;
secBuffers[2].BufferType = SECBUFFER_STREAM_TRAILER;
secBuffers[3].cbBuffer = 0;
secBuffers[3].BufferType = SECBUFFER_EMPTY;
secBuffers[3].pvBuffer = nullptr;
SecBufferDesc secBufferDesc;
secBufferDesc.ulVersion = SECBUFFER_VERSION;
secBufferDesc.cBuffers = 4;
secBufferDesc.pBuffers = secBuffers;
auto ret = EncryptMessage(static_cast<CtxtHandle*>(context), 0, &secBufferDesc, 0); // FIXME
debug << "Send:\n\tHeader size: " << secBuffers[0].cbBuffer << "\n\t\ttype: " << secBuffers[0].BufferType << "\n\tData size: " << secBuffers[1].cbBuffer << "\n\t\ttype: " << secBuffers[1].BufferType << "\n\tFooter size: " << secBuffers[2].cbBuffer << "\n\t\ttype: " << secBuffers[2].BufferType << "\n";
size_t sendSize = 0;
for (size_t i = 0; i < 4; ++i)
if (secBuffers[i].cbBuffer != bufferSize)
sendSize += secBuffers[i].cbBuffer;
debug << "\tReal length? " << sendSize << "\n";
switch (ret)
{
case SEC_E_OK:
socket.write(sendBuffer, sendSize);
break;
// TODO: More?
default:
size = 0;
break;
}
delete[] sendBuffer;
return size;
}
void SChannelConnection::destroyContext()
{
if (context)
{
DeleteSecurityContext(context);
delete context;
context = nullptr;
}
}
void SChannelConnection::close()
{
destroyContext();
socket.close();
}
bool SChannelConnection::valid()
{
return true;
}
#endif // HTTPS_BACKEND_SCHANNEL