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refactored the serializatio of Auth_Data

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otavepto 2023-12-22 20:51:25 +02:00 committed by otavepto
parent 48a8ada43f
commit a626470846
1 changed files with 93 additions and 10 deletions
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101
dll/auth.h
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@ -1,3 +1,5 @@
// source of the data: https://github.com/Detanup01/stmsrv/blob/main/Steam3Server/Others/AppTickets.cs
#ifndef AUTH_INCLUDE
#define AUTH_INCLUDE
@ -321,6 +323,35 @@ struct Auth_Data {
std::vector<uint8_t> Serialize()
{
/*
* layout of Auth_Data with GC:
* ------------------------
* X bytes: GC data blob (currently 52 bytes)
* ------------------------
* 4 bytes: remaining Auth_Data blob size (4 + Y + Z)
* ------------------------
* 4 bytes: size of ticket data layout (not blob!, hence blob + 4)
* ------------------------
* Y bytes: ticket data blob
* ------------------------
* Z bytes: App Ticket signature
* ------------------------
*
* total layout length = X + 4 + 4 + Y + Z
*/
/*
* layout of Auth_Data without GC:
* ------------------------
* 4 bytes: size of ticket data layout (not blob!, hence blob + 4)
* ------------------------
* Y bytes: ticket data blob
* ------------------------
* Z bytes: App Ticket signature
* ------------------------
*
* total layout length = 4 + Y + Z
*/
const uint64_t steam_id = id.ConvertToUint64();
PRINT_DEBUG(
@ -334,31 +365,81 @@ struct Auth_Data {
number
);
/*
* layout of ticket data:
* ------------------------
* 4 bytes: size of ticket data layout (not blob!, hence blob + 4)
* ------------------------
* Y bytes: ticket data blob
* ------------------------
*
* total layout length = 4 + Y
*/
std::vector<uint8_t> tickedData = Ticket.Serialize();
size_t size = tickedData.size() + 4;
// we need this variable because we depend on the sizeof, must be 4 bytes
const uint32_t ticket_data_layout_length =
sizeof(uint32_t) +
(uint32_t)tickedData.size();
size_t total_size_without_siglen = ticket_data_layout_length;
std::vector<uint8_t> GCData;
size_t gc_data_layout_length = 0;
if (HasGC)
{
/*
* layout of GC data:
* ------------------------
* X bytes: GC data blob (currently 52 bytes)
* ------------------------
* 4 bytes: remaining Auth_Data blob size
* ------------------------
*
* total layout length = X + 4
*/
GCData = GC.Serialize();
size += GCData.size() + 4;
gc_data_layout_length +=
GCData.size() +
sizeof(uint32_t);
total_size_without_siglen += gc_data_layout_length;
}
PRINT_DEBUG("AUTH::Auth_Data::SER final size = %zu\n", size);
const size_t final_buffer_size = total_size_without_siglen + STEAM_APPTICKET_SIGLEN;
PRINT_DEBUG(
"AUTH::Auth_Data::SER size without sig len = %zu, size with sig len (final size) = %zu\n",
total_size_without_siglen,
final_buffer_size
);
std::vector<uint8_t> buffer;
buffer.resize(size + STEAM_APPTICKET_SIGLEN);
buffer.resize(final_buffer_size);
uint8_t* pBuffer = buffer.data();
#define SER_VAR(v) \
*reinterpret_cast<std::remove_const<decltype(v)>::type *>(pBuffer) = v; \
pBuffer += sizeof(v)
// serialize the GC data first
if (HasGC)
{
memcpy(pBuffer, GCData.data(), GCData.size());
pBuffer+= GCData.size();
pBuffer += GCData.size();
*reinterpret_cast<uint32_t*>(pBuffer) = (128+tickedData.size()+4);
pBuffer += 4;
// when GC data is written (HasGC),
// the next 4 bytes after the GCData will be the length of the remaining data in the final buffer
// i.e. final buffer size - length of GCData layout
// i.e. ticket data length + STEAM_APPTICKET_SIGLEN
//
// notice that we subtract the entire layout length, not just GCData.size(),
// otherwise these next 4 bytes will include themselves!
uint32_t remaining_length = (uint32_t)(final_buffer_size - gc_data_layout_length);
SER_VAR(remaining_length);
}
*reinterpret_cast<uint32_t*>(pBuffer) = (tickedData.size()+4);
pBuffer += 4;
// serialize the ticket data
SER_VAR(ticket_data_layout_length);
memcpy(pBuffer, tickedData.data(), tickedData.size());
#ifndef EMU_RELEASE_BUILD
@ -368,6 +449,8 @@ struct Auth_Data {
#endif
//Todo make a signature
#undef SER_VAR
return buffer;
}
};