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qemu/hw/usb/u2f.c

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/*
* U2F USB device.
*
* Copyright (c) 2020 César Belley <cesar.belley@lse.epita.fr>
* Written by César Belley <cesar.belley@lse.epita.fr>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "hw/usb.h"
#include "hw/usb/hid.h"
#include "migration/vmstate.h"
#include "desc.h"
#include "u2f.h"
/* U2F key Vendor / Product */
#define U2F_KEY_VENDOR_NUM 0x46f4 /* CRC16() of "QEMU" */
#define U2F_KEY_PRODUCT_NUM 0x0005
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER,
STR_CONFIG,
STR_INTERFACE
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "QEMU",
[STR_PRODUCT] = "U2F USB key",
[STR_SERIALNUMBER] = "0",
[STR_CONFIG] = "U2F key config",
[STR_INTERFACE] = "U2F key interface"
};
static const USBDescIface desc_iface_u2f_key = {
.bInterfaceNumber = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_HID,
.bInterfaceSubClass = 0x0,
.bInterfaceProtocol = 0x0,
.ndesc = 1,
.descs = (USBDescOther[]) {
{
/* HID descriptor */
.data = (uint8_t[]) {
0x09, /* u8 bLength */
USB_DT_HID, /* u8 bDescriptorType */
0x10, 0x01, /* u16 HID_class */
0x00, /* u8 country_code */
0x01, /* u8 num_descriptors */
USB_DT_REPORT, /* u8 type: Report */
0x22, 0, /* u16 len */
},
},
},
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = U2FHID_PACKET_SIZE,
.bInterval = 0x05,
}, {
.bEndpointAddress = USB_DIR_OUT | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = U2FHID_PACKET_SIZE,
.bInterval = 0x05,
},
},
};
static const USBDescDevice desc_device_u2f_key = {
.bcdUSB = 0x0100,
.bMaxPacketSize0 = U2FHID_PACKET_SIZE,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.iConfiguration = STR_CONFIG,
.bmAttributes = USB_CFG_ATT_ONE,
.bMaxPower = 15,
.nif = 1,
.ifs = &desc_iface_u2f_key,
},
},
};
static const USBDesc desc_u2f_key = {
.id = {
.idVendor = U2F_KEY_VENDOR_NUM,
.idProduct = U2F_KEY_PRODUCT_NUM,
.bcdDevice = 0,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device_u2f_key,
.str = desc_strings,
};
static const uint8_t u2f_key_hid_report_desc[] = {
0x06, 0xd0, 0xf1, /* Usage Page (FIDO) */
0x09, 0x01, /* Usage (FIDO) */
0xa1, 0x01, /* Collection (HID Application) */
0x09, 0x20, /* Usage (FIDO data in) */
0x15, 0x00, /* Logical Minimum (0) */
0x26, 0xFF, 0x00, /* Logical Maximum (0xff) */
0x75, 0x08, /* Report Size (8) */
0x95, 0x40, /* Report Count (0x40) */
0x81, 0x02, /* Input (Data, Variable, Absolute) */
0x09, 0x21, /* Usage (FIDO data out) */
0x15, 0x00, /* Logical Minimum (0) */
0x26, 0xFF, 0x00, /* Logical Maximum (0xFF) */
0x75, 0x08, /* Report Size (8) */
0x95, 0x40, /* Report Count (0x40) */
0x91, 0x02, /* Output (Data, Variable, Absolute) */
0xC0 /* End Collection */
};
static void u2f_key_reset(U2FKeyState *key)
{
key->pending_in_start = 0;
key->pending_in_end = 0;
key->pending_in_num = 0;
}
static void u2f_key_handle_reset(USBDevice *dev)
{
U2FKeyState *key = U2F_KEY(dev);
u2f_key_reset(key);
}
static void u2f_key_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
U2FKeyState *key = U2F_KEY(dev);
int ret;
ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
if (ret >= 0) {
return;
}
switch (request) {
case InterfaceRequest | USB_REQ_GET_DESCRIPTOR:
switch (value >> 8) {
case 0x22:
memcpy(data, u2f_key_hid_report_desc,
sizeof(u2f_key_hid_report_desc));
p->actual_length = sizeof(u2f_key_hid_report_desc);
break;
default:
goto fail;
}
break;
case HID_GET_IDLE:
data[0] = key->idle;
p->actual_length = 1;
break;
case HID_SET_IDLE:
key->idle = (uint8_t)(value >> 8);
break;
default:
fail:
p->status = USB_RET_STALL;
break;
}
}
static void u2f_key_recv_from_guest(U2FKeyState *key, USBPacket *p)
{
U2FKeyClass *kc = U2F_KEY_GET_CLASS(key);
uint8_t packet[U2FHID_PACKET_SIZE];
if (kc->recv_from_guest == NULL || p->iov.size != U2FHID_PACKET_SIZE) {
return;
}
usb_packet_copy(p, packet, p->iov.size);
kc->recv_from_guest(key, packet);
}
static void u2f_pending_in_add(U2FKeyState *key,
const uint8_t packet[U2FHID_PACKET_SIZE])
{
uint8_t index;
if (key->pending_in_num >= U2FHID_PENDING_IN_NUM) {
return;
}
index = key->pending_in_end;
key->pending_in_end = (index + 1) % U2FHID_PENDING_IN_NUM;
++key->pending_in_num;
memcpy(key->pending_in[index], packet, U2FHID_PACKET_SIZE);
}
static uint8_t *u2f_pending_in_get(U2FKeyState *key)
{
uint8_t index;
if (key->pending_in_num == 0) {
return NULL;
}
index = key->pending_in_start;
key->pending_in_start = (index + 1) % U2FHID_PENDING_IN_NUM;
--key->pending_in_num;
return key->pending_in[index];
}
static void u2f_key_handle_data(USBDevice *dev, USBPacket *p)
{
U2FKeyState *key = U2F_KEY(dev);
uint8_t *packet_in;
/* Endpoint number check */
if (p->ep->nr != 1) {
p->status = USB_RET_STALL;
return;
}
switch (p->pid) {
case USB_TOKEN_OUT:
u2f_key_recv_from_guest(key, p);
break;
case USB_TOKEN_IN:
packet_in = u2f_pending_in_get(key);
if (packet_in == NULL) {
p->status = USB_RET_NAK;
return;
}
usb_packet_copy(p, packet_in, U2FHID_PACKET_SIZE);
break;
default:
p->status = USB_RET_STALL;
break;
}
}
void u2f_send_to_guest(U2FKeyState *key,
const uint8_t packet[U2FHID_PACKET_SIZE])
{
u2f_pending_in_add(key, packet);
usb_wakeup(key->ep, 0);
}
static void u2f_key_unrealize(USBDevice *dev)
{
U2FKeyState *key = U2F_KEY(dev);
U2FKeyClass *kc = U2F_KEY_GET_CLASS(key);
if (kc->unrealize != NULL) {
kc->unrealize(key);
}
}
static void u2f_key_realize(USBDevice *dev, Error **errp)
{
U2FKeyState *key = U2F_KEY(dev);
U2FKeyClass *kc = U2F_KEY_GET_CLASS(key);
Error *local_err = NULL;
usb_desc_create_serial(dev);
usb_desc_init(dev);
u2f_key_reset(key);
if (kc->realize != NULL) {
kc->realize(key, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return;
}
}
key->ep = usb_ep_get(dev, USB_TOKEN_IN, 1);
}
const VMStateDescription vmstate_u2f_key = {
.name = "u2f-key",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_USB_DEVICE(dev, U2FKeyState),
VMSTATE_UINT8(idle, U2FKeyState),
VMSTATE_UINT8_2DARRAY(pending_in, U2FKeyState,
U2FHID_PENDING_IN_NUM, U2FHID_PACKET_SIZE),
VMSTATE_UINT8(pending_in_start, U2FKeyState),
VMSTATE_UINT8(pending_in_end, U2FKeyState),
VMSTATE_UINT8(pending_in_num, U2FKeyState),
VMSTATE_END_OF_LIST()
}
};
static void u2f_key_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->product_desc = "QEMU U2F USB key";
uc->usb_desc = &desc_u2f_key;
uc->handle_reset = u2f_key_handle_reset;
uc->handle_control = u2f_key_handle_control;
uc->handle_data = u2f_key_handle_data;
uc->handle_attach = usb_desc_attach;
uc->realize = u2f_key_realize;
uc->unrealize = u2f_key_unrealize;
dc->desc = "QEMU U2F key";
dc->vmsd = &vmstate_u2f_key;
}
static const TypeInfo u2f_key_info = {
.name = TYPE_U2F_KEY,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(U2FKeyState),
.abstract = true,
.class_size = sizeof(U2FKeyClass),
.class_init = u2f_key_class_init,
};
static void u2f_key_register_types(void)
{
type_register_static(&u2f_key_info);
}
type_init(u2f_key_register_types)
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