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trezor-firmware/legacy/firmware/usb.c

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/usb/hid.h>
#include <libopencm3/usb/usbd.h>
#include "common.h"
#include "config.h"
#include "debug.h"
#include "messages.h"
#include "timer.h"
#include "trezor.h"
#if U2F_ENABLED
#include "u2f.h"
#endif
#include "usb.h"
#include "util.h"
#include "usb21_standard.h"
#include "webusb.h"
#include "winusb.h"
#define USB_INTERFACE_INDEX_MAIN 0
#if DEBUG_LINK
#define USB_INTERFACE_INDEX_DEBUG 1
#if U2F_ENABLED
#define USB_INTERFACE_INDEX_U2F 2
#define USB_INTERFACE_COUNT 3
#else
#define USB_INTERFACE_COUNT 2
#endif
#else
#if U2F_ENABLED
#define USB_INTERFACE_INDEX_U2F 1
#define USB_INTERFACE_COUNT 2
#else
#define USB_INTERFACE_COUNT 1
#endif
#endif
#define ENDPOINT_ADDRESS_MAIN_IN (0x81)
#define ENDPOINT_ADDRESS_MAIN_OUT (0x01)
#if DEBUG_LINK
#define ENDPOINT_ADDRESS_DEBUG_IN (0x82)
#define ENDPOINT_ADDRESS_DEBUG_OUT (0x02)
#endif
#if U2F_ENABLED
#define ENDPOINT_ADDRESS_U2F_IN (0x83)
#define ENDPOINT_ADDRESS_U2F_OUT (0x03)
#endif
#define USB_STRINGS \
X(MANUFACTURER, "SatoshiLabs") \
X(PRODUCT, "TREZOR") \
X(SERIAL_NUMBER, config_uuid_str) \
X(INTERFACE_MAIN, "TREZOR Interface") \
X(INTERFACE_DEBUG, "TREZOR Debug Link Interface") \
X(INTERFACE_U2F, "TREZOR U2F Interface")
#define X(name, value) USB_STRING_##name,
enum {
USB_STRING_LANGID_CODES, // LANGID code array
USB_STRINGS
};
#undef X
#define X(name, value) value,
static const char *usb_strings[] = {USB_STRINGS};
#undef X
static const struct usb_device_descriptor dev_descr = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = 0x0210,
.bDeviceClass = 0,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.bMaxPacketSize0 = 64,
.idVendor = 0x1209,
.idProduct = 0x53c1,
.bcdDevice = 0x0100,
.iManufacturer = USB_STRING_MANUFACTURER,
.iProduct = USB_STRING_PRODUCT,
.iSerialNumber = USB_STRING_SERIAL_NUMBER,
.bNumConfigurations = 1,
};
#if U2F_ENABLED
static const uint8_t hid_report_descriptor_u2f[] = {
0x06, 0xd0, 0xf1, // USAGE_PAGE (FIDO Alliance)
0x09, 0x01, // USAGE (U2F HID Authenticator Device)
0xa1, 0x01, // COLLECTION (Application)
0x09, 0x20, // USAGE (Input Report Data)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x40, // REPORT_COUNT (64)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x09, 0x21, // USAGE (Output Report Data)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x40, // REPORT_COUNT (64)
0x91, 0x02, // OUTPUT (Data,Var,Abs)
0xc0 // END_COLLECTION
};
static const struct {
struct usb_hid_descriptor hid_descriptor_u2f;
struct {
uint8_t bReportDescriptorType;
uint16_t wDescriptorLength;
} __attribute__((packed)) hid_report_u2f;
} __attribute__((packed))
hid_function_u2f = {.hid_descriptor_u2f =
{
.bLength = sizeof(hid_function_u2f),
.bDescriptorType = USB_DT_HID,
.bcdHID = 0x0111,
.bCountryCode = 0,
.bNumDescriptors = 1,
},
.hid_report_u2f = {
.bReportDescriptorType = USB_DT_REPORT,
.wDescriptorLength = sizeof(hid_report_descriptor_u2f),
}};
static const struct usb_endpoint_descriptor hid_endpoints_u2f[2] = {
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_U2F_IN,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
},
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_U2F_OUT,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
}};
static const struct usb_interface_descriptor hid_iface_u2f[] = {{
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = USB_INTERFACE_INDEX_U2F,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = USB_STRING_INTERFACE_U2F,
.endpoint = hid_endpoints_u2f,
.extra = &hid_function_u2f,
.extralen = sizeof(hid_function_u2f),
}};
#endif
#if DEBUG_LINK
static const struct usb_endpoint_descriptor webusb_endpoints_debug[2] = {
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_DEBUG_IN,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
},
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_DEBUG_OUT,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
}};
static const struct usb_interface_descriptor webusb_iface_debug[] = {{
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = USB_INTERFACE_INDEX_DEBUG,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = USB_STRING_INTERFACE_DEBUG,
.endpoint = webusb_endpoints_debug,
.extra = NULL,
.extralen = 0,
}};
#endif
static const struct usb_endpoint_descriptor webusb_endpoints_main[2] = {
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_MAIN_IN,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
},
{
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = ENDPOINT_ADDRESS_MAIN_OUT,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 64,
.bInterval = 1,
}};
static const struct usb_interface_descriptor webusb_iface_main[] = {{
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = USB_INTERFACE_INDEX_MAIN,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = USB_STRING_INTERFACE_MAIN,
.endpoint = webusb_endpoints_main,
.extra = NULL,
.extralen = 0,
}};
// Windows are strict about interfaces appearing
// in correct order
static const struct usb_interface ifaces[] = {
{
.num_altsetting = 1,
.altsetting = webusb_iface_main,
#if DEBUG_LINK
},
{
.num_altsetting = 1,
.altsetting = webusb_iface_debug,
#endif
#if U2F_ENABLED
},
{
.num_altsetting = 1,
.altsetting = hid_iface_u2f,
#endif
}};
static const struct usb_config_descriptor config = {
.bLength = USB_DT_CONFIGURATION_SIZE,
.bDescriptorType = USB_DT_CONFIGURATION,
.wTotalLength = 0,
.bNumInterfaces = USB_INTERFACE_COUNT,
.bConfigurationValue = 1,
.iConfiguration = 0,
.bmAttributes = 0x80,
.bMaxPower = 0x32,
.interface = ifaces,
};
static volatile char tiny = 0;
#if U2F_ENABLED
static enum usbd_request_return_codes hid_control_request(
usbd_device *dev, struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
usbd_control_complete_callback *complete) {
(void)complete;
(void)dev;
wait_random();
if ((req->bmRequestType != 0x81) ||
(req->bRequest != USB_REQ_GET_DESCRIPTOR) || (req->wValue != 0x2200))
return 0;
debugLog(0, "", "hid_control_request u2f");
*buf = (uint8_t *)hid_report_descriptor_u2f;
*len = MIN_8bits(*len, sizeof(hid_report_descriptor_u2f));
return 1;
}
static void u2f_rx_callback(usbd_device *dev, uint8_t ep) {
(void)ep;
static CONFIDENTIAL uint8_t buf[64] __attribute__((aligned(4)));
debugLog(0, "", "u2f_rx_callback");
if (usbd_ep_read_packet(dev, ENDPOINT_ADDRESS_U2F_OUT, buf, 64) != 64) return;
u2fhid_read(tiny, (const U2FHID_FRAME *)(void *)buf);
}
#endif
static void main_rx_callback(usbd_device *dev, uint8_t ep) {
(void)ep;
static CONFIDENTIAL uint8_t buf[64] __attribute__((aligned(4)));
if (usbd_ep_read_packet(dev, ENDPOINT_ADDRESS_MAIN_OUT, buf, 64) != 64)
return;
debugLog(0, "", "main_rx_callback");
if (!tiny) {
msg_read(buf, 64);
} else {
msg_read_tiny(buf, 64);
}
}
#if DEBUG_LINK
static void debug_rx_callback(usbd_device *dev, uint8_t ep) {
(void)ep;
static uint8_t buf[64] __attribute__((aligned(4)));
if (usbd_ep_read_packet(dev, ENDPOINT_ADDRESS_DEBUG_OUT, buf, 64) != 64)
return;
debugLog(0, "", "debug_rx_callback");
if (!tiny) {
msg_debug_read(buf, 64);
} else {
msg_read_tiny(buf, 64);
}
}
#endif
static void set_config(usbd_device *dev, uint16_t wValue) {
(void)wValue;
usbd_ep_setup(dev, ENDPOINT_ADDRESS_MAIN_IN, USB_ENDPOINT_ATTR_INTERRUPT, 64,
0);
usbd_ep_setup(dev, ENDPOINT_ADDRESS_MAIN_OUT, USB_ENDPOINT_ATTR_INTERRUPT, 64,
main_rx_callback);
#if U2F_ENABLED
usbd_ep_setup(dev, ENDPOINT_ADDRESS_U2F_IN, USB_ENDPOINT_ATTR_INTERRUPT, 64,
0);
usbd_ep_setup(dev, ENDPOINT_ADDRESS_U2F_OUT, USB_ENDPOINT_ATTR_INTERRUPT, 64,
u2f_rx_callback);
#endif
#if DEBUG_LINK
usbd_ep_setup(dev, ENDPOINT_ADDRESS_DEBUG_IN, USB_ENDPOINT_ATTR_INTERRUPT, 64,
0);
usbd_ep_setup(dev, ENDPOINT_ADDRESS_DEBUG_OUT, USB_ENDPOINT_ATTR_INTERRUPT,
64, debug_rx_callback);
#endif
#if U2F_ENABLED
usbd_register_control_callback(
dev, USB_REQ_TYPE_STANDARD | USB_REQ_TYPE_INTERFACE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT, hid_control_request);
#endif
}
static usbd_device *usbd_dev = NULL;
static uint8_t usbd_control_buffer[256] __attribute__((aligned(2)));
static const struct usb_device_capability_descriptor *capabilities[] = {
(const struct usb_device_capability_descriptor
*)&webusb_platform_capability_descriptor_no_landing,
};
static const struct usb_bos_descriptor bos_descriptor = {
.bLength = USB_DT_BOS_SIZE,
.bDescriptorType = USB_DT_BOS,
.bNumDeviceCaps = sizeof(capabilities) / sizeof(capabilities[0]),
.capabilities = capabilities};
void usbInit(void) {
usbd_dev = usbd_init(&otgfs_usb_driver, &dev_descr, &config, usb_strings,
sizeof(usb_strings) / sizeof(*usb_strings),
usbd_control_buffer, sizeof(usbd_control_buffer));
usbd_register_set_config_callback(usbd_dev, set_config);
usb21_setup(usbd_dev, &bos_descriptor);
static const char *origin_url = "trezor.io/start";
webusb_setup(usbd_dev, origin_url);
// Debug link interface does not have WinUSB set;
// if you really need debug link on windows, edit the descriptor in winusb.c
winusb_setup(usbd_dev, USB_INTERFACE_INDEX_MAIN);
}
void usbPoll(void) {
if (usbd_dev == NULL) {
return;
}
static const uint8_t *data;
// poll read buffer
usbd_poll(usbd_dev);
// write pending data
data = msg_out_data();
if (data) {
while (usbd_ep_write_packet(usbd_dev, ENDPOINT_ADDRESS_MAIN_IN, data, 64) !=
64) {
}
}
#if U2F_ENABLED
data = u2f_out_data();
if (data) {
while (usbd_ep_write_packet(usbd_dev, ENDPOINT_ADDRESS_U2F_IN, data, 64) !=
64) {
}
}
#endif
#if DEBUG_LINK
// write pending debug data
data = msg_debug_out_data();
if (data) {
while (usbd_ep_write_packet(usbd_dev, ENDPOINT_ADDRESS_DEBUG_IN, data,
64) != 64) {
}
}
#endif
}
void usbReconnect(void) {
if (usbd_dev != NULL) {
usbd_disconnect(usbd_dev, 1);
delay(1000);
usbd_disconnect(usbd_dev, 0);
}
}
char usbTiny(char set) {
char old = tiny;
tiny = set;
return old;
}
void usbSleep(uint32_t millis) {
uint32_t start = timer_ms();
while ((timer_ms() - start) < millis) {
if (usbd_dev != NULL) {
usbd_poll(usbd_dev);
}
}
}
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