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