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// Copyright 2019 Robin Krahl <robin.krahl@ireas.org>
// SPDX-License-Identifier: GPL-3.0-or-later
use usb_device::bus::{UsbBus, UsbBusAllocator};
use usb_device::device::{UsbDevice, UsbDeviceBuilder, UsbVidPid};
use crate::hid::{HidDevice, Protocol, ReportType, Subclass};
use crate::util::TryFrom;
const VID_CLAY_LOGIC: u16 = 0x20a0;
const PID_NITROKEY_PRO: u16 = 0x4108;
const REPORT_LEN: usize = 64;
const REPORT_DESCRIPTOR: &[u8] = &[
0x05, 0x01, 0x09, 0x06, 0xA1, 0x01, 0x05, 0x07, 0x19, 0xE0, 0x29, 0xE7, 0x15, 0x00, 0x25, 0x01,
0x75, 0x01, 0x95, 0x08, 0x81, 0x02, 0x95, 0x01, 0x75, 0x08, 0x81, 0x03, 0x95, 0x05, 0x75, 0x01,
0x05, 0x08, 0x19, 0x01, 0x29, 0x05, 0x91, 0x02, 0x95, 0x01, 0x75, 0x03, 0x91, 0x03, 0x95, 0x06,
0x75, 0x08, 0x15, 0x00, 0x25, 0x65, 0x05, 0x07, 0x19, 0x00, 0x29, 0x65, 0x81, 0x00, 0x09, 0x03,
0x75, 0x08, 0x95, 0x40, 0xB1, 0x02, 0xC0,
];
enum_u8! {
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum DeviceStatus {
Ok = 0,
Busy = 1,
Error = 2,
ReceivedReport = 3,
}
}
enum_u8! {
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CommandStatus {
Ok = 0,
WrongCrc = 1,
WrongSlot = 2,
SlotNotProgrammed = 3,
WrongPassword = 4,
NotAuthorized = 5,
TimestampWarning = 6,
NoNameError = 7,
NotSupported = 8,
UnknownCommand = 9,
AesDecryptionFailed = 10,
}
}
enum_u8! {
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum CommandId {
GetStatus = 0,
ReadSlotName = 2,
}
}
pub struct Nitrokey {
buf: [u8; REPORT_LEN],
}
impl Nitrokey {
pub fn new() -> Self {
Nitrokey {
buf: [0; REPORT_LEN],
}
}
fn execute_command(
&self,
command_id: CommandId,
data: &[u8],
) -> Result<[u8; 53], CommandStatus> {
match command_id {
CommandId::GetStatus => {
let mut data = [0u8; 53];
data[0] = 1; // firmware_version_st.minor
data[1] = 0; // firmware_version_st.major
data[2] = 0; // card_serial[0]
data[3] = 0; // card_serial[1]
data[4] = 0; // card_serial[2]
data[5] = 0; // card_serial[3]
data[6] = 0; // numlock
data[7] = 0; // capslock
data[8] = 0; // enable_user_password
data[9] = 0; // delete_user_password
Ok(data)
}
CommandId::ReadSlotName => {
assert!(data.len() > 1);
let slot_number = data[0];
if slot_number != 0x20 {
Err(CommandStatus::SlotNotProgrammed)
} else {
let mut data = [0u8; 53];
data[0] = 0x74; // t
data[1] = 0x65; // e
data[2] = 0x73; // s
data[3] = 0x74; // t
Ok(data)
}
}
}
}
}
impl HidDevice for Nitrokey {
fn subclass(&self) -> Subclass {
Subclass::BootInterface
}
fn protocol(&self) -> Protocol {
Protocol::Keyboard
}
fn report_descriptor(&self) -> &[u8] {
REPORT_DESCRIPTOR
}
fn get_report(&mut self, report_type: ReportType, report_id: u8) -> Result<&[u8], ()> {
if report_type != ReportType::Feature || report_id != 0 {
return Err(());
}
let device_status = DeviceStatus::Ok;
let command_id = self.buf[0];
let result = if let Ok(command_id) = CommandId::try_from(command_id) {
self.execute_command(command_id, &self.buf[1..60])
} else {
Err(CommandStatus::UnknownCommand)
};
let (command_status, command_data) = result
.map(|d| (CommandStatus::Ok, d))
.unwrap_or_else(|status| (status, [0; 53]));
let pre_data: [u8; 7] = [
device_status.into(), // device status
command_id, // command_id
self.buf[60],
self.buf[61],
self.buf[62],
self.buf[63], // last_command_crc
command_status.into(), // last_command_status
];
let post_data: [u8; 4] = [
0x00, 0x00, 0x00, 0x01, // crc -- libnitrokey accepts any non-zero value
];
self.buf[0..7].copy_from_slice(&pre_data);
self.buf[7..7 + command_data.len()].copy_from_slice(&command_data);
self.buf[60..64].copy_from_slice(&post_data);
Ok(&self.buf)
}
fn set_report(
&mut self,
report_type: ReportType,
report_id: u8,
data: &[u8],
) -> Result<(), ()> {
if report_type != ReportType::Feature || report_id != 0 || data.len() != REPORT_LEN {
Err(())
} else {
self.buf.copy_from_slice(data);
Ok(())
}
}
}
pub fn create_usb_device<B: UsbBus>(alloc: &UsbBusAllocator<B>) -> UsbDevice<'_, B> {
UsbDeviceBuilder::new(alloc, UsbVidPid(VID_CLAY_LOGIC, PID_NITROKEY_PRO))
.manufacturer("Nitrokey/ntw")
.product("Nitrokey Pro/ntw")
.serial_number("?")
.build()
}
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