Services/UDS: Implement DecryptBeaconData.

This function decrypts the encrypted data tags contained in the 802.11 beacon frames.
master
Subv 2017-05-29 14:40:00 +07:00
parent 3df85a103a
commit d7d0b46fc1
1 changed files with 97 additions and 1 deletions

@ -422,6 +422,102 @@ static void SetApplicationData(Interface* self) {
rb.Push(RESULT_SUCCESS);
}
/**
* NWM_UDS::DecryptBeaconData service function.
* Decrypts the encrypted data tags contained in the 802.11 beacons.
* Inputs:
* 1 : Input network struct buffer descriptor.
* 2 : Input network struct buffer ptr.
* 3 : Input tag0 encrypted buffer descriptor.
* 4 : Input tag0 encrypted buffer ptr.
* 5 : Input tag1 encrypted buffer descriptor.
* 6 : Input tag1 encrypted buffer ptr.
* 64 : Output buffer descriptor.
* 65 : Output buffer ptr.
* Outputs:
* 0 : Return header
* 1 : Result of function, 0 on success, otherwise error code
*/
static void DecryptBeaconData(Interface* self) {
IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1F, 0, 6);
size_t desc_size;
const VAddr network_struct_addr = rp.PopStaticBuffer(&desc_size);
ASSERT(desc_size == sizeof(NetworkInfo));
size_t data0_size;
const VAddr encrypted_data0_addr = rp.PopStaticBuffer(&data0_size);
size_t data1_size;
const VAddr encrypted_data1_addr = rp.PopStaticBuffer(&data1_size);
size_t output_buffer_size;
const VAddr output_buffer_addr = rp.PeekStaticBuffer(0, &output_buffer_size);
// This size is hardcoded in the 3DS UDS code.
ASSERT(output_buffer_size == sizeof(NodeInfo) * UDSMaxNodes);
LOG_WARNING(Service_NWM, "called in0=%08X in1=%08X out=%08X", encrypted_data0_addr,
encrypted_data1_addr, output_buffer_addr);
NetworkInfo net_info;
Memory::ReadBlock(network_struct_addr, &net_info, sizeof(net_info));
// Read the encrypted data.
// The first 4 bytes should be the OUI and the OUI Type of the tags.
std::array<u8, 3> oui;
Memory::ReadBlock(encrypted_data0_addr, oui.data(), oui.size());
ASSERT_MSG(oui == NintendoOUI, "Unexpected OUI");
Memory::ReadBlock(encrypted_data1_addr, oui.data(), oui.size());
ASSERT_MSG(oui == NintendoOUI, "Unexpected OUI");
ASSERT_MSG(Memory::Read8(encrypted_data0_addr + 3) ==
static_cast<u8>(NintendoTagId::EncryptedData0),
"Unexpected tag id");
ASSERT_MSG(Memory::Read8(encrypted_data1_addr + 3) ==
static_cast<u8>(NintendoTagId::EncryptedData1),
"Unexpected tag id");
std::vector<u8> beacon_data(data0_size + data1_size);
Memory::ReadBlock(encrypted_data0_addr + 4, beacon_data.data(), data0_size);
Memory::ReadBlock(encrypted_data1_addr + 4, beacon_data.data() + data0_size, data1_size);
// Decrypt the data
DecryptBeaconData(net_info, beacon_data);
// The beacon data header contains the MD5 hash of the data.
BeaconData beacon_header;
std::memcpy(&beacon_header, beacon_data.data(), sizeof(beacon_header));
// TODO(Subv): Verify the MD5 hash of the data and return 0xE1211005 if invalid.
u8 num_nodes = net_info.max_nodes;
std::vector<NodeInfo> nodes;
for (int i = 0; i < num_nodes; ++i) {
BeaconNodeInfo info;
std::memcpy(&info, beacon_data.data() + sizeof(beacon_header) + i * sizeof(info),
sizeof(info));
// Deserialize the node information.
NodeInfo node{};
node.friend_code_seed = info.friend_code_seed;
node.network_node_id = info.network_node_id;
for (int i = 0; i < info.username.size(); ++i)
node.username[i] = info.username[i];
nodes.push_back(node);
}
Memory::ZeroBlock(output_buffer_addr, sizeof(NodeInfo) * UDSMaxNodes);
Memory::WriteBlock(output_buffer_addr, nodes.data(), sizeof(NodeInfo) * nodes.size());
IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
rb.PushStaticBuffer(output_buffer_addr, output_buffer_size, 0);
rb.Push(RESULT_SUCCESS);
}
// Sends a 802.11 beacon frame with information about the current network.
static void BeaconBroadcastCallback(u64 userdata, int cycles_late) {
// Don't do anything if we're not actually hosting a network
@ -462,7 +558,7 @@ const Interface::FunctionInfo FunctionTable[] = {
{0x001B0302, InitializeWithVersion, "InitializeWithVersion"},
{0x001D0044, BeginHostingNetwork, "BeginHostingNetwork"},
{0x001E0084, nullptr, "ConnectToNetwork"},
{0x001F0006, nullptr, "DecryptBeaconData"},
{0x001F0006, DecryptBeaconData, "DecryptBeaconData"},
{0x00200040, nullptr, "Flush"},
{0x00210080, nullptr, "SetProbeResponseParam"},
{0x00220402, nullptr, "ScanOnConnection"},