* [PULL 01/18] hw: xhci: check return value of 'usb_packet_map'
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 02/18] hw: ehci: destroy sglist in error path Gerd Hoffmann
` (17 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, Eduardo Habkost, Li Qiang,
Alexander Bulekov, Gerd Hoffmann, Cleber Rosa, Paolo Bonzini
From: Li Qiang <liq3ea@163.com>
Currently we don't check the return value of 'usb_packet_map',
this will cause an UAF issue. This is LP#1891341.
Following is the reproducer provided in:
-->https://bugs.launchpad.net/qemu/+bug/1891341
cat << EOF | ./i386-softmmu/qemu-system-i386 -device nec-usb-xhci \
-trace usb\* -device usb-audio -device usb-storage,drive=mydrive \
-drive id=mydrive,file=null-co://,size=2M,format=raw,if=none \
-nodefaults -nographic -qtest stdio
outl 0xcf8 0x80001016
outl 0xcfc 0x3c009f0d
outl 0xcf8 0x80001004
outl 0xcfc 0xc77695e
writel 0x9f0d000000000040 0xffff3655
writeq 0x9f0d000000002000 0xff2f9e0000000000
write 0x1d 0x1 0x27
write 0x2d 0x1 0x2e
write 0x17232 0x1 0x03
write 0x17254 0x1 0x06
write 0x17278 0x1 0x34
write 0x3d 0x1 0x27
write 0x40 0x1 0x2e
write 0x41 0x1 0x72
write 0x42 0x1 0x01
write 0x4d 0x1 0x2e
write 0x4f 0x1 0x01
writeq 0x9f0d000000002000 0x5c051a0100000000
write 0x34001d 0x1 0x13
write 0x340026 0x1 0x30
write 0x340028 0x1 0x08
write 0x34002c 0x1 0xfe
write 0x34002d 0x1 0x08
write 0x340037 0x1 0x5e
write 0x34003a 0x1 0x05
write 0x34003d 0x1 0x05
write 0x34004d 0x1 0x13
writeq 0x9f0d000000002000 0xff00010100400009
EOF
This patch fixes this.
Buglink: https://bugs.launchpad.net/qemu/+bug/1891341
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-id: 20200812153139.15146-1-liq3ea@163.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/hcd-xhci.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 67a18fe2b64c..46a2186d912a 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1615,7 +1615,10 @@ static int xhci_setup_packet(XHCITransfer *xfer)
xhci_xfer_create_sgl(xfer, dir == USB_TOKEN_IN); /* Also sets int_req */
usb_packet_setup(&xfer->packet, dir, ep, xfer->streamid,
xfer->trbs[0].addr, false, xfer->int_req);
- usb_packet_map(&xfer->packet, &xfer->sgl);
+ if (usb_packet_map(&xfer->packet, &xfer->sgl)) {
+ qemu_sglist_destroy(&xfer->sgl);
+ return -1;
+ }
DPRINTF("xhci: setup packet pid 0x%x addr %d ep %d\n",
xfer->packet.pid, ep->dev->addr, ep->nr);
return 0;
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 02/18] hw: ehci: destroy sglist in error path
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
2020-08-31 8:32 ` [PULL 01/18] hw: xhci: check return value of 'usb_packet_map' Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 03/18] hw: ehci: check return value of 'usb_packet_map' Gerd Hoffmann
` (16 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, Eduardo Habkost, Li Qiang, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini
From: Li Qiang <liq3ea@163.com>
This may cause resource leak.
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20200812161712.29361-1-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/hcd-ehci.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 1495e8f7fab1..58cceacbf83a 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1445,6 +1445,7 @@ static int ehci_process_itd(EHCIState *ehci,
dev = ehci_find_device(ehci, devaddr);
if (dev == NULL) {
ehci_trace_guest_bug(ehci, "no device found");
+ qemu_sglist_destroy(&ehci->isgl);
return -1;
}
pid = dir ? USB_TOKEN_IN : USB_TOKEN_OUT;
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 03/18] hw: ehci: check return value of 'usb_packet_map'
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
2020-08-31 8:32 ` [PULL 01/18] hw: xhci: check return value of 'usb_packet_map' Gerd Hoffmann
2020-08-31 8:32 ` [PULL 02/18] hw: ehci: destroy sglist in error path Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 04/18] ehci: drop pointless warn_report for guest bugs Gerd Hoffmann
` (15 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, Eduardo Habkost, Li Qiang, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini
From: Li Qiang <liq3ea@163.com>
If 'usb_packet_map' fails, we should stop to process the usb
request.
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20200812161727.29412-1-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/hcd-ehci.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 58cceacbf83a..4da446d2de6b 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1373,7 +1373,10 @@ static int ehci_execute(EHCIPacket *p, const char *action)
spd = (p->pid == USB_TOKEN_IN && NLPTR_TBIT(p->qtd.altnext) == 0);
usb_packet_setup(&p->packet, p->pid, ep, 0, p->qtdaddr, spd,
(p->qtd.token & QTD_TOKEN_IOC) != 0);
- usb_packet_map(&p->packet, &p->sgl);
+ if (usb_packet_map(&p->packet, &p->sgl)) {
+ qemu_sglist_destroy(&p->sgl);
+ return -1;
+ }
p->async = EHCI_ASYNC_INITIALIZED;
}
@@ -1453,7 +1456,10 @@ static int ehci_process_itd(EHCIState *ehci,
if (ep && ep->type == USB_ENDPOINT_XFER_ISOC) {
usb_packet_setup(&ehci->ipacket, pid, ep, 0, addr, false,
(itd->transact[i] & ITD_XACT_IOC) != 0);
- usb_packet_map(&ehci->ipacket, &ehci->isgl);
+ if (usb_packet_map(&ehci->ipacket, &ehci->isgl)) {
+ qemu_sglist_destroy(&ehci->isgl);
+ return -1;
+ }
usb_handle_packet(dev, &ehci->ipacket);
usb_packet_unmap(&ehci->ipacket, &ehci->isgl);
} else {
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 04/18] ehci: drop pointless warn_report for guest bugs.
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (2 preceding siblings ...)
2020-08-31 8:32 ` [PULL 03/18] hw: ehci: check return value of 'usb_packet_map' Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 05/18] hw/usb: Regroup USB HID protocol values Gerd Hoffmann
` (14 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, Eduardo Habkost, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Philippe Mathieu-Daudé
We have a tracepoint at the same place which can be enabled if needed.
Buglink: https://bugzilla.redhat.com//show_bug.cgi?id=1859236
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200722072613.10390-1-kraxel@redhat.com>
---
hw/usb/hcd-ehci.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 4da446d2de6b..2b995443fbfd 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -352,7 +352,6 @@ static void ehci_trace_sitd(EHCIState *s, hwaddr addr,
static void ehci_trace_guest_bug(EHCIState *s, const char *message)
{
trace_usb_ehci_guest_bug(message);
- warn_report("%s", message);
}
static inline bool ehci_enabled(EHCIState *s)
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 05/18] hw/usb: Regroup USB HID protocol values
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (3 preceding siblings ...)
2020-08-31 8:32 ` [PULL 04/18] ehci: drop pointless warn_report for guest bugs Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 06/18] docs: Add USB U2F key device documentation Gerd Hoffmann
` (13 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
Group some HID values that are used pretty much everywhere when
dealing with HID devices.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200812094135.20550-2-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
include/hw/usb/hid.h | 17 +++++++++++++++++
hw/usb/dev-hid.c | 26 +++++++-------------------
hw/usb/dev-wacom.c | 12 +++---------
3 files changed, 27 insertions(+), 28 deletions(-)
create mode 100644 include/hw/usb/hid.h
diff --git a/include/hw/usb/hid.h b/include/hw/usb/hid.h
new file mode 100644
index 000000000000..1c142584ffab
--- /dev/null
+++ b/include/hw/usb/hid.h
@@ -0,0 +1,17 @@
+#ifndef HW_USB_HID_H
+#define HW_USB_HID_H
+
+/* HID interface requests */
+#define HID_GET_REPORT 0xa101
+#define HID_GET_IDLE 0xa102
+#define HID_GET_PROTOCOL 0xa103
+#define HID_SET_REPORT 0x2109
+#define HID_SET_IDLE 0x210a
+#define HID_SET_PROTOCOL 0x210b
+
+/* HID descriptor types */
+#define USB_DT_HID 0x21
+#define USB_DT_REPORT 0x22
+#define USB_DT_PHY 0x23
+
+#endif
diff --git a/hw/usb/dev-hid.c b/hw/usb/dev-hid.c
index 89f63b698b8a..c73f7b2fe2c5 100644
--- a/hw/usb/dev-hid.c
+++ b/hw/usb/dev-hid.c
@@ -32,21 +32,9 @@
#include "qemu/module.h"
#include "qemu/timer.h"
#include "hw/input/hid.h"
+#include "hw/usb/hid.h"
#include "hw/qdev-properties.h"
-/* HID interface requests */
-#define GET_REPORT 0xa101
-#define GET_IDLE 0xa102
-#define GET_PROTOCOL 0xa103
-#define SET_REPORT 0x2109
-#define SET_IDLE 0x210a
-#define SET_PROTOCOL 0x210b
-
-/* HID descriptor types */
-#define USB_DT_HID 0x21
-#define USB_DT_REPORT 0x22
-#define USB_DT_PHY 0x23
-
typedef struct USBHIDState {
USBDevice dev;
USBEndpoint *intr;
@@ -618,38 +606,38 @@ static void usb_hid_handle_control(USBDevice *dev, USBPacket *p,
goto fail;
}
break;
- case GET_REPORT:
+ case HID_GET_REPORT:
if (hs->kind == HID_MOUSE || hs->kind == HID_TABLET) {
p->actual_length = hid_pointer_poll(hs, data, length);
} else if (hs->kind == HID_KEYBOARD) {
p->actual_length = hid_keyboard_poll(hs, data, length);
}
break;
- case SET_REPORT:
+ case HID_SET_REPORT:
if (hs->kind == HID_KEYBOARD) {
p->actual_length = hid_keyboard_write(hs, data, length);
} else {
goto fail;
}
break;
- case GET_PROTOCOL:
+ case HID_GET_PROTOCOL:
if (hs->kind != HID_KEYBOARD && hs->kind != HID_MOUSE) {
goto fail;
}
data[0] = hs->protocol;
p->actual_length = 1;
break;
- case SET_PROTOCOL:
+ case HID_SET_PROTOCOL:
if (hs->kind != HID_KEYBOARD && hs->kind != HID_MOUSE) {
goto fail;
}
hs->protocol = value;
break;
- case GET_IDLE:
+ case HID_GET_IDLE:
data[0] = hs->idle;
p->actual_length = 1;
break;
- case SET_IDLE:
+ case HID_SET_IDLE:
hs->idle = (uint8_t) (value >> 8);
hid_set_next_idle(hs);
if (hs->kind == HID_MOUSE || hs->kind == HID_TABLET) {
diff --git a/hw/usb/dev-wacom.c b/hw/usb/dev-wacom.c
index 8aba44b8bc3d..76fc5a5dabf3 100644
--- a/hw/usb/dev-wacom.c
+++ b/hw/usb/dev-wacom.c
@@ -29,6 +29,7 @@
#include "qemu/osdep.h"
#include "ui/console.h"
#include "hw/usb.h"
+#include "hw/usb/hid.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "desc.h"
@@ -37,13 +38,6 @@
#define WACOM_GET_REPORT 0x2101
#define WACOM_SET_REPORT 0x2109
-/* HID interface requests */
-#define HID_GET_REPORT 0xa101
-#define HID_GET_IDLE 0xa102
-#define HID_GET_PROTOCOL 0xa103
-#define HID_SET_IDLE 0x210a
-#define HID_SET_PROTOCOL 0x210b
-
typedef struct USBWacomState {
USBDevice dev;
USBEndpoint *intr;
@@ -86,11 +80,11 @@ static const USBDescIface desc_iface_wacom = {
/* HID descriptor */
.data = (uint8_t[]) {
0x09, /* u8 bLength */
- 0x21, /* u8 bDescriptorType */
+ USB_DT_HID, /* u8 bDescriptorType */
0x01, 0x10, /* u16 HID_class */
0x00, /* u8 country_code */
0x01, /* u8 num_descriptors */
- 0x22, /* u8 type: Report */
+ USB_DT_REPORT, /* u8 type: Report */
0x6e, 0, /* u16 len */
},
},
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 06/18] docs: Add USB U2F key device documentation
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (4 preceding siblings ...)
2020-08-31 8:32 ` [PULL 05/18] hw/usb: Regroup USB HID protocol values Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 07/18] hw/usb: Add U2F key base class Gerd Hoffmann
` (12 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
Add USB U2F key device documentation:
- USB U2F key device
- Building
- Using u2f-emulated
- Using u2f-passthru
- Libu2f-emu
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-3-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
docs/u2f.txt | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
create mode 100644 docs/u2f.txt
diff --git a/docs/u2f.txt b/docs/u2f.txt
new file mode 100644
index 000000000000..f60052882ec3
--- /dev/null
+++ b/docs/u2f.txt
@@ -0,0 +1,101 @@
+QEMU U2F Key Device Documentation.
+
+Contents
+1. USB U2F key device
+2. Building
+3. Using u2f-emulated
+4. Using u2f-passthru
+5. Libu2f-emu
+
+1. USB U2F key device
+
+U2F is an open authentication standard that enables relying parties
+exposed to the internet to offer a strong second factor option for end
+user authentication.
+
+The standard brings many advantages to both parties, client and server,
+allowing to reduce over-reliance on passwords, it increases authentication
+security and simplifies passwords.
+
+The second factor is materialized by a device implementing the U2F
+protocol. In case of a USB U2F security key, it is a USB HID device
+that implements the U2F protocol.
+
+In Qemu, the USB U2F key device offers a dedicated support of U2F, allowing
+guest USB FIDO/U2F security keys operating in two possible modes:
+pass-through and emulated.
+
+The pass-through mode consists of passing all requests made from the guest
+to the physical security key connected to the host machine and vice versa.
+In addition, the dedicated pass-through allows to have a U2F security key
+shared on several guests which is not possible with a simple host device
+assignment pass-through.
+
+The emulated mode consists of completely emulating the behavior of an
+U2F device through software part. Libu2f-emu is used for that.
+
+
+2. Building
+
+To ensure the build of the u2f-emulated device variant which depends
+on libu2f-emu: configuring and building:
+
+ ./configure --enable-u2f && make
+
+
+3. Using u2f-emulated
+
+To work, an emulated U2F device must have four elements:
+ * ec x509 certificate
+ * ec private key
+ * counter (four bytes value)
+ * 48 bytes of entropy (random bits)
+
+To use this type of device, this one has to be configured, and these
+four elements must be passed one way or another.
+
+Assuming that you have a working libu2f-emu installed on the host.
+There are three possible ways of configurations:
+ * ephemeral
+ * setup directory
+ * manual
+
+Ephemeral is the simplest way to configure, it lets the device generate
+all the elements it needs for a single use of the lifetime of the device.
+
+ qemu -usb -device u2f-emulated
+
+Setup directory allows to configure the device from a directory containing
+four files:
+ * certificate.pem: ec x509 certificate
+ * private-key.pem: ec private key
+ * counter: counter value
+ * entropy: 48 bytes of entropy
+
+ qemu -usb -device u2f-emulated,dir=$dir
+
+Manual allows to configure the device more finely by specifying each
+of the elements necessary for the device:
+ * cert
+ * priv
+ * counter
+ * entropy
+
+ qemu -usb -device u2f-emulated,cert=$DIR1/$FILE1,priv=$DIR2/$FILE2,counter=$DIR3/$FILE3,entropy=$DIR4/$FILE4
+
+
+4. Using u2f-passthru
+
+On the host specify the u2f-passthru device with a suitable hidraw:
+
+ qemu -usb -device u2f-passthru,hidraw=/dev/hidraw0
+
+
+5. Libu2f-emu
+
+The u2f-emulated device uses libu2f-emu for the U2F key emulation. Libu2f-emu
+implements completely the U2F protocol device part for all specified
+transport given by the FIDO Alliance.
+
+For more information about libu2f-emu see this page:
+https://github.com/MattGorko/libu2f-emu.
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 07/18] hw/usb: Add U2F key base class
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (5 preceding siblings ...)
2020-08-31 8:32 ` [PULL 06/18] docs: Add USB U2F key device documentation Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 08/18] hw/usb: Add U2F key base class implementation Gerd Hoffmann
` (11 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds the specification for the U2F key base class.
Used to group the common characteristics, this device class will be
inherited by its two variants, corresponding to the two modes:
passthrough and emulated
This prepares the U2F devices hierarchy which is as follow:
USB device -> u2f-key -> {u2f-passthru, u2f-emulated}.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-4-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/u2f.h | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
create mode 100644 hw/usb/u2f.h
diff --git a/hw/usb/u2f.h b/hw/usb/u2f.h
new file mode 100644
index 000000000000..db30f3586bf7
--- /dev/null
+++ b/hw/usb/u2f.h
@@ -0,0 +1,92 @@
+/*
+ * 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.
+ */
+
+#ifndef U2F_H
+#define U2F_H
+
+#include "hw/qdev-core.h"
+
+#define U2FHID_PACKET_SIZE 64
+#define U2FHID_PENDING_IN_NUM 32
+
+typedef struct U2FKeyState U2FKeyState;
+typedef struct U2FKeyInfo U2FKeyInfo;
+
+#define TYPE_U2F_KEY "u2f-key"
+#define U2F_KEY(obj) \
+ OBJECT_CHECK(U2FKeyState, (obj), TYPE_U2F_KEY)
+#define U2F_KEY_CLASS(klass) \
+ OBJECT_CLASS_CHECK(U2FKeyClass, (klass), TYPE_U2F_KEY)
+#define U2F_KEY_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(U2FKeyClass, (obj), TYPE_U2F_KEY)
+
+/*
+ * Callbacks to be used by the U2F key base device (i.e. hw/u2f.c)
+ * to interact with its variants (i.e. hw/u2f-*.c)
+ */
+typedef struct U2FKeyClass {
+ /*< private >*/
+ USBDeviceClass parent_class;
+
+ /*< public >*/
+ void (*recv_from_guest)(U2FKeyState *key,
+ const uint8_t packet[U2FHID_PACKET_SIZE]);
+ void (*realize)(U2FKeyState *key, Error **errp);
+ void (*unrealize)(U2FKeyState *key);
+} U2FKeyClass;
+
+/*
+ * State of the U2F key base device (i.e. hw/u2f.c)
+ */
+typedef struct U2FKeyState {
+ USBDevice dev;
+ USBEndpoint *ep;
+ uint8_t idle;
+
+ /* Pending packets to be send to the guest */
+ uint8_t pending_in[U2FHID_PENDING_IN_NUM][U2FHID_PACKET_SIZE];
+ uint8_t pending_in_start;
+ uint8_t pending_in_end;
+ uint8_t pending_in_num;
+} U2FKeyState;
+
+/*
+ * API to be used by the U2F key device variants (i.e. hw/u2f-*.c)
+ * to interact with the the U2F key base device (i.e. hw/u2f.c)
+ */
+void u2f_send_to_guest(U2FKeyState *key,
+ const uint8_t packet[U2FHID_PACKET_SIZE]);
+
+extern const VMStateDescription vmstate_u2f_key;
+
+#define VMSTATE_U2F_KEY(_field, _state) { \
+ .name = (stringify(_field)), \
+ .size = sizeof(U2FKeyState), \
+ .vmsd = &vmstate_u2f_key, \
+ .flags = VMS_STRUCT, \
+ .offset = vmstate_offset_value(_state, _field, U2FKeyState), \
+}
+
+#endif /* U2F_H */
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 08/18] hw/usb: Add U2F key base class implementation
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (6 preceding siblings ...)
2020-08-31 8:32 ` [PULL 07/18] hw/usb: Add U2F key base class Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 09/18] hw/usb: Add U2F key passthru mode Gerd Hoffmann
` (10 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds the U2F key base class implementation.
The U2F key base mainly takes care of the HID interfacing with guest.
On the one hand, it retrieves the guest U2FHID packets and transmits
them to the variant associated according to the mode: pass-through
or emulated.
On the other hand, it provides the public API used by its variants to
send U2FHID packets to the guest.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-5-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/u2f.c | 352 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 352 insertions(+)
create mode 100644 hw/usb/u2f.c
diff --git a/hw/usb/u2f.c b/hw/usb/u2f.c
new file mode 100644
index 000000000000..bc09191f063e
--- /dev/null
+++ b/hw/usb/u2f.c
@@ -0,0 +1,352 @@
+/*
+ * 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);
+ usb_legacy_register(TYPE_U2F_KEY, "u2f-key", NULL);
+}
+
+type_init(u2f_key_register_types)
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 09/18] hw/usb: Add U2F key passthru mode
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (7 preceding siblings ...)
2020-08-31 8:32 ` [PULL 08/18] hw/usb: Add U2F key base class implementation Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 10/18] hw/usb: Add U2F key emulated mode Gerd Hoffmann
` (9 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds the U2F key pass-through mode.
The pass-through mode consists of passing all requests made from the
guest to the physical security key connected to the host machine and
vice versa.
In addition, the dedicated pass-through allows to have a U2F security key
shared on several guests which is not possible with a simple host device
assignment pass-through.
The pass-through mode is associated with a device inheriting from
u2f-key base.
To work, it needs the path to a U2F hidraw, obtained from the Qemu
command line, and passed by the user:
qemu -usb -device u2f-passthru,hidraw=/dev/hidrawX
Autoscan and U2F compatibility checking features are given at the end
of the patch series.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-6-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/u2f-passthru.c | 423 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 423 insertions(+)
create mode 100644 hw/usb/u2f-passthru.c
diff --git a/hw/usb/u2f-passthru.c b/hw/usb/u2f-passthru.c
new file mode 100644
index 000000000000..52b44670775d
--- /dev/null
+++ b/hw/usb/u2f-passthru.c
@@ -0,0 +1,423 @@
+/*
+ * U2F USB Passthru 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 "qemu/main-loop.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "hw/qdev-properties.h"
+#include "hw/usb.h"
+#include "migration/vmstate.h"
+
+#include "u2f.h"
+
+#define NONCE_SIZE 8
+#define BROADCAST_CID 0xFFFFFFFF
+#define TRANSACTION_TIMEOUT 120000
+
+struct transaction {
+ uint32_t cid;
+ uint16_t resp_bcnt;
+ uint16_t resp_size;
+
+ /* Nonce for broadcast isolation */
+ uint8_t nonce[NONCE_SIZE];
+};
+
+typedef struct U2FPassthruState U2FPassthruState;
+
+#define CURRENT_TRANSACTIONS_NUM 4
+
+struct U2FPassthruState {
+ U2FKeyState base;
+
+ /* Host device */
+ char *hidraw;
+ int hidraw_fd;
+
+ /* Current Transactions */
+ struct transaction current_transactions[CURRENT_TRANSACTIONS_NUM];
+ uint8_t current_transactions_start;
+ uint8_t current_transactions_end;
+ uint8_t current_transactions_num;
+
+ /* Transaction time checking */
+ int64_t last_transaction_time;
+ QEMUTimer timer;
+};
+
+#define TYPE_U2F_PASSTHRU "u2f-passthru"
+#define PASSTHRU_U2F_KEY(obj) \
+ OBJECT_CHECK(U2FPassthruState, (obj), TYPE_U2F_PASSTHRU)
+
+/* Init packet sizes */
+#define PACKET_INIT_HEADER_SIZE 7
+#define PACKET_INIT_DATA_SIZE (U2FHID_PACKET_SIZE - PACKET_INIT_HEADER_SIZE)
+
+/* Cont packet sizes */
+#define PACKET_CONT_HEADER_SIZE 5
+#define PACKET_CONT_DATA_SIZE (U2FHID_PACKET_SIZE - PACKET_CONT_HEADER_SIZE)
+
+struct packet_init {
+ uint32_t cid;
+ uint8_t cmd;
+ uint8_t bcnth;
+ uint8_t bcntl;
+ uint8_t data[PACKET_INIT_DATA_SIZE];
+} QEMU_PACKED;
+
+static inline uint32_t packet_get_cid(const void *packet)
+{
+ return *((uint32_t *)packet);
+}
+
+static inline bool packet_is_init(const void *packet)
+{
+ return ((uint8_t *)packet)[4] & (1 << 7);
+}
+
+static inline uint16_t packet_init_get_bcnt(
+ const struct packet_init *packet_init)
+{
+ uint16_t bcnt = 0;
+ bcnt |= packet_init->bcnth << 8;
+ bcnt |= packet_init->bcntl;
+
+ return bcnt;
+}
+
+static void u2f_passthru_reset(U2FPassthruState *key)
+{
+ timer_del(&key->timer);
+ qemu_set_fd_handler(key->hidraw_fd, NULL, NULL, key);
+ key->last_transaction_time = 0;
+ key->current_transactions_start = 0;
+ key->current_transactions_end = 0;
+ key->current_transactions_num = 0;
+}
+
+static void u2f_timeout_check(void *opaque)
+{
+ U2FPassthruState *key = opaque;
+ int64_t time = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
+
+ if (time > key->last_transaction_time + TRANSACTION_TIMEOUT) {
+ u2f_passthru_reset(key);
+ } else {
+ timer_mod(&key->timer, time + TRANSACTION_TIMEOUT / 4);
+ }
+}
+
+static int u2f_transaction_get_index(U2FPassthruState *key, uint32_t cid)
+{
+ for (int i = 0; i < key->current_transactions_num; ++i) {
+ int index = (key->current_transactions_start + i)
+ % CURRENT_TRANSACTIONS_NUM;
+ if (cid == key->current_transactions[index].cid) {
+ return index;
+ }
+ }
+ return -1;
+}
+
+static struct transaction *u2f_transaction_get(U2FPassthruState *key,
+ uint32_t cid)
+{
+ int index = u2f_transaction_get_index(key, cid);
+ if (index < 0) {
+ return NULL;
+ }
+ return &key->current_transactions[index];
+}
+
+static struct transaction *u2f_transaction_get_from_nonce(U2FPassthruState *key,
+ const uint8_t nonce[NONCE_SIZE])
+{
+ for (int i = 0; i < key->current_transactions_num; ++i) {
+ int index = (key->current_transactions_start + i)
+ % CURRENT_TRANSACTIONS_NUM;
+ if (key->current_transactions[index].cid == BROADCAST_CID
+ && memcmp(nonce, key->current_transactions[index].nonce,
+ NONCE_SIZE) == 0) {
+ return &key->current_transactions[index];
+ }
+ }
+ return NULL;
+}
+
+static void u2f_transaction_close(U2FPassthruState *key, uint32_t cid)
+{
+ int index, next_index;
+ index = u2f_transaction_get_index(key, cid);
+ if (index < 0) {
+ return;
+ }
+ next_index = (index + 1) % CURRENT_TRANSACTIONS_NUM;
+
+ /* Rearrange to ensure the oldest is at the start position */
+ while (next_index != key->current_transactions_end) {
+ memcpy(&key->current_transactions[index],
+ &key->current_transactions[next_index],
+ sizeof(struct transaction));
+
+ index = next_index;
+ next_index = (index + 1) % CURRENT_TRANSACTIONS_NUM;
+ }
+
+ key->current_transactions_end = index;
+ --key->current_transactions_num;
+
+ if (key->current_transactions_num == 0) {
+ u2f_passthru_reset(key);
+ }
+}
+
+static void u2f_transaction_add(U2FPassthruState *key, uint32_t cid,
+ const uint8_t nonce[NONCE_SIZE])
+{
+ uint8_t index;
+ struct transaction *transaction;
+
+ if (key->current_transactions_num >= CURRENT_TRANSACTIONS_NUM) {
+ /* Close the oldest transaction */
+ index = key->current_transactions_start;
+ transaction = &key->current_transactions[index];
+ u2f_transaction_close(key, transaction->cid);
+ }
+
+ /* Index */
+ index = key->current_transactions_end;
+ key->current_transactions_end = (index + 1) % CURRENT_TRANSACTIONS_NUM;
+ ++key->current_transactions_num;
+
+ /* Transaction */
+ transaction = &key->current_transactions[index];
+ transaction->cid = cid;
+ transaction->resp_bcnt = 0;
+ transaction->resp_size = 0;
+
+ /* Nonce */
+ if (nonce != NULL) {
+ memcpy(transaction->nonce, nonce, NONCE_SIZE);
+ }
+}
+
+static void u2f_passthru_read(void *opaque);
+
+static void u2f_transaction_start(U2FPassthruState *key,
+ const struct packet_init *packet_init)
+{
+ int64_t time;
+
+ /* Transaction */
+ if (packet_init->cid == BROADCAST_CID) {
+ u2f_transaction_add(key, packet_init->cid, packet_init->data);
+ } else {
+ u2f_transaction_add(key, packet_init->cid, NULL);
+ }
+
+ /* Time */
+ time = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
+ if (key->last_transaction_time == 0) {
+ qemu_set_fd_handler(key->hidraw_fd, u2f_passthru_read, NULL, key);
+ timer_init_ms(&key->timer, QEMU_CLOCK_VIRTUAL, u2f_timeout_check, key);
+ timer_mod(&key->timer, time + TRANSACTION_TIMEOUT / 4);
+ }
+ key->last_transaction_time = time;
+}
+
+static void u2f_passthru_recv_from_host(U2FPassthruState *key,
+ const uint8_t packet[U2FHID_PACKET_SIZE])
+{
+ struct transaction *transaction;
+ uint32_t cid;
+
+ /* Retrieve transaction */
+ cid = packet_get_cid(packet);
+ if (cid == BROADCAST_CID) {
+ struct packet_init *packet_init;
+ if (!packet_is_init(packet)) {
+ return;
+ }
+ packet_init = (struct packet_init *)packet;
+ transaction = u2f_transaction_get_from_nonce(key, packet_init->data);
+ } else {
+ transaction = u2f_transaction_get(key, cid);
+ }
+
+ /* Ignore no started transaction */
+ if (transaction == NULL) {
+ return;
+ }
+
+ if (packet_is_init(packet)) {
+ struct packet_init *packet_init = (struct packet_init *)packet;
+ transaction->resp_bcnt = packet_init_get_bcnt(packet_init);
+ transaction->resp_size = PACKET_INIT_DATA_SIZE;
+
+ if (packet_init->cid == BROADCAST_CID) {
+ /* Nonce checking for legitimate response */
+ if (memcmp(transaction->nonce, packet_init->data, NONCE_SIZE)
+ != 0) {
+ return;
+ }
+ }
+ } else {
+ transaction->resp_size += PACKET_CONT_DATA_SIZE;
+ }
+
+ /* Transaction end check */
+ if (transaction->resp_size >= transaction->resp_bcnt) {
+ u2f_transaction_close(key, cid);
+ }
+ u2f_send_to_guest(&key->base, packet);
+}
+
+static void u2f_passthru_read(void *opaque)
+{
+ U2FPassthruState *key = opaque;
+ U2FKeyState *base = &key->base;
+ uint8_t packet[2 * U2FHID_PACKET_SIZE];
+ int ret;
+
+ /* Full size base queue check */
+ if (base->pending_in_num >= U2FHID_PENDING_IN_NUM) {
+ return;
+ }
+
+ ret = read(key->hidraw_fd, packet, sizeof(packet));
+ if (ret < 0) {
+ /* Detach */
+ if (base->dev.attached) {
+ usb_device_detach(&base->dev);
+ u2f_passthru_reset(key);
+ }
+ return;
+ }
+ if (ret != U2FHID_PACKET_SIZE) {
+ return;
+ }
+ u2f_passthru_recv_from_host(key, packet);
+}
+
+static void u2f_passthru_recv_from_guest(U2FKeyState *base,
+ const uint8_t packet[U2FHID_PACKET_SIZE])
+{
+ U2FPassthruState *key = PASSTHRU_U2F_KEY(base);
+ uint8_t host_packet[U2FHID_PACKET_SIZE + 1];
+ ssize_t written;
+
+ if (packet_is_init(packet)) {
+ u2f_transaction_start(key, (struct packet_init *)packet);
+ }
+
+ host_packet[0] = 0;
+ memcpy(host_packet + 1, packet, U2FHID_PACKET_SIZE);
+
+ written = write(key->hidraw_fd, host_packet, sizeof(host_packet));
+ if (written != sizeof(host_packet)) {
+ error_report("%s: Bad written size (req 0x%zu, val 0x%zd)",
+ TYPE_U2F_PASSTHRU, sizeof(host_packet), written);
+ }
+}
+
+static void u2f_passthru_unrealize(U2FKeyState *base)
+{
+ U2FPassthruState *key = PASSTHRU_U2F_KEY(base);
+
+ u2f_passthru_reset(key);
+ qemu_close(key->hidraw_fd);
+}
+
+static void u2f_passthru_realize(U2FKeyState *base, Error **errp)
+{
+ U2FPassthruState *key = PASSTHRU_U2F_KEY(base);
+ int fd;
+
+ if (key->hidraw == NULL) {
+ error_setg(errp, "%s: Missing hidraw", TYPE_U2F_PASSTHRU);
+ return;
+ }
+
+ fd = qemu_open(key->hidraw, O_RDWR);
+ if (fd < 0) {
+ error_setg(errp, "%s: Failed to open %s", TYPE_U2F_PASSTHRU,
+ key->hidraw);
+ return;
+ }
+ key->hidraw_fd = fd;
+ u2f_passthru_reset(key);
+}
+
+static int u2f_passthru_post_load(void *opaque, int version_id)
+{
+ U2FPassthruState *key = opaque;
+ u2f_passthru_reset(key);
+ return 0;
+}
+
+static const VMStateDescription u2f_passthru_vmstate = {
+ .name = "u2f-key-passthru",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = u2f_passthru_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_U2F_KEY(base, U2FPassthruState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static Property u2f_passthru_properties[] = {
+ DEFINE_PROP_STRING("hidraw", U2FPassthruState, hidraw),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void u2f_passthru_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ U2FKeyClass *kc = U2F_KEY_CLASS(klass);
+
+ kc->realize = u2f_passthru_realize;
+ kc->unrealize = u2f_passthru_unrealize;
+ kc->recv_from_guest = u2f_passthru_recv_from_guest;
+ dc->desc = "QEMU U2F passthrough key";
+ dc->vmsd = &u2f_passthru_vmstate;
+ device_class_set_props(dc, u2f_passthru_properties);
+}
+
+static const TypeInfo u2f_key_passthru_info = {
+ .name = TYPE_U2F_PASSTHRU,
+ .parent = TYPE_U2F_KEY,
+ .instance_size = sizeof(U2FPassthruState),
+ .class_init = u2f_passthru_class_init
+};
+
+static void u2f_key_passthru_register_types(void)
+{
+ type_register_static(&u2f_key_passthru_info);
+}
+
+type_init(u2f_key_passthru_register_types)
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 10/18] hw/usb: Add U2F key emulated mode
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (8 preceding siblings ...)
2020-08-31 8:32 ` [PULL 09/18] hw/usb: Add U2F key passthru mode Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 11/18] meson: Add U2F key to meson Gerd Hoffmann
` (8 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds the U2F key emulated mode.
The emulated mode consists of completely emulating the behavior of a
U2F device through software part. Libu2f-emu is used for that.
The emulated mode is associated with a device inheriting from
u2f-key base.
To work, an emulated U2F device must have differents elements which
can be given in different ways. This is detailed in docs/u2f.txt.
The Ephemeral one is the simplest way to configure, it lets the device
generate all the elements it needs for a single use of the lifetime
of the device:
qemu -usb -device u2f-emulated
For more information about libu2f-emu see this page:
https://github.com/MattGorko/libu2f-emu.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-7-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/u2f-emulated.c | 405 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 405 insertions(+)
create mode 100644 hw/usb/u2f-emulated.c
diff --git a/hw/usb/u2f-emulated.c b/hw/usb/u2f-emulated.c
new file mode 100644
index 000000000000..9e1b829f3d32
--- /dev/null
+++ b/hw/usb/u2f-emulated.c
@@ -0,0 +1,405 @@
+/*
+ * U2F USB Emulated 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 "qemu/thread.h"
+#include "qemu/main-loop.h"
+#include "qapi/error.h"
+#include "hw/usb.h"
+#include "hw/qdev-properties.h"
+
+#include <u2f-emu/u2f-emu.h>
+
+#include "u2f.h"
+
+/* Counter which sync with a file */
+struct synced_counter {
+ /* Emulated device counter */
+ struct u2f_emu_vdev_counter vdev_counter;
+
+ /* Private attributes */
+ uint32_t value;
+ FILE *fp;
+};
+
+static void counter_increment(struct u2f_emu_vdev_counter *vdev_counter)
+{
+ struct synced_counter *counter = (struct synced_counter *)vdev_counter;
+ ++counter->value;
+
+ /* Write back */
+ if (fseek(counter->fp, 0, SEEK_SET) == -1) {
+ return;
+ }
+ fprintf(counter->fp, "%u\n", counter->value);
+}
+
+static uint32_t counter_read(struct u2f_emu_vdev_counter *vdev_counter)
+{
+ struct synced_counter *counter = (struct synced_counter *)vdev_counter;
+ return counter->value;
+}
+
+typedef struct U2FEmulatedState U2FEmulatedState;
+
+#define PENDING_OUT_NUM 32
+
+struct U2FEmulatedState {
+ U2FKeyState base;
+
+ /* U2F virtual emulated device */
+ u2f_emu_vdev *vdev;
+ QemuMutex vdev_mutex;
+
+ /* Properties */
+ char *dir;
+ char *cert;
+ char *privkey;
+ char *entropy;
+ char *counter;
+ struct synced_counter synced_counter;
+
+ /* Pending packets received from the guest */
+ uint8_t pending_out[PENDING_OUT_NUM][U2FHID_PACKET_SIZE];
+ uint8_t pending_out_start;
+ uint8_t pending_out_end;
+ uint8_t pending_out_num;
+ QemuMutex pending_out_mutex;
+
+ /* Emulation thread and sync */
+ QemuCond key_cond;
+ QemuMutex key_mutex;
+ QemuThread key_thread;
+ bool stop_thread;
+ EventNotifier notifier;
+};
+
+#define TYPE_U2F_EMULATED "u2f-emulated"
+#define EMULATED_U2F_KEY(obj) \
+ OBJECT_CHECK(U2FEmulatedState, (obj), TYPE_U2F_EMULATED)
+
+static void u2f_emulated_reset(U2FEmulatedState *key)
+{
+ key->pending_out_start = 0;
+ key->pending_out_end = 0;
+ key->pending_out_num = 0;
+}
+
+static void u2f_pending_out_add(U2FEmulatedState *key,
+ const uint8_t packet[U2FHID_PACKET_SIZE])
+{
+ int index;
+
+ if (key->pending_out_num >= PENDING_OUT_NUM) {
+ return;
+ }
+
+ index = key->pending_out_end;
+ key->pending_out_end = (index + 1) % PENDING_OUT_NUM;
+ ++key->pending_out_num;
+
+ memcpy(&key->pending_out[index], packet, U2FHID_PACKET_SIZE);
+}
+
+static uint8_t *u2f_pending_out_get(U2FEmulatedState *key)
+{
+ int index;
+
+ if (key->pending_out_num == 0) {
+ return NULL;
+ }
+
+ index = key->pending_out_start;
+ key->pending_out_start = (index + 1) % PENDING_OUT_NUM;
+ --key->pending_out_num;
+
+ return key->pending_out[index];
+}
+
+static void u2f_emulated_recv_from_guest(U2FKeyState *base,
+ const uint8_t packet[U2FHID_PACKET_SIZE])
+{
+ U2FEmulatedState *key = EMULATED_U2F_KEY(base);
+
+ qemu_mutex_lock(&key->pending_out_mutex);
+ u2f_pending_out_add(key, packet);
+ qemu_mutex_unlock(&key->pending_out_mutex);
+
+ qemu_mutex_lock(&key->key_mutex);
+ qemu_cond_signal(&key->key_cond);
+ qemu_mutex_unlock(&key->key_mutex);
+}
+
+static void *u2f_emulated_thread(void* arg)
+{
+ U2FEmulatedState *key = arg;
+ uint8_t packet[U2FHID_PACKET_SIZE];
+ uint8_t *packet_out = NULL;
+
+
+ while (true) {
+ /* Wait signal */
+ qemu_mutex_lock(&key->key_mutex);
+ qemu_cond_wait(&key->key_cond, &key->key_mutex);
+ qemu_mutex_unlock(&key->key_mutex);
+
+ /* Exit thread check */
+ if (key->stop_thread) {
+ key->stop_thread = false;
+ break;
+ }
+
+ qemu_mutex_lock(&key->pending_out_mutex);
+ packet_out = u2f_pending_out_get(key);
+ if (packet_out == NULL) {
+ qemu_mutex_unlock(&key->pending_out_mutex);
+ continue;
+ }
+ memcpy(packet, packet_out, U2FHID_PACKET_SIZE);
+ qemu_mutex_unlock(&key->pending_out_mutex);
+
+ qemu_mutex_lock(&key->vdev_mutex);
+ u2f_emu_vdev_send(key->vdev, U2F_EMU_USB, packet,
+ U2FHID_PACKET_SIZE);
+
+ /* Notify response */
+ if (u2f_emu_vdev_has_response(key->vdev, U2F_EMU_USB)) {
+ event_notifier_set(&key->notifier);
+ }
+ qemu_mutex_unlock(&key->vdev_mutex);
+ }
+ return NULL;
+}
+
+static ssize_t u2f_emulated_read(const char *path, char *buffer,
+ size_t buffer_len)
+{
+ int fd;
+ ssize_t ret;
+
+ fd = qemu_open(path, O_RDONLY);
+ if (fd < 0) {
+ return -1;
+ }
+
+ ret = read(fd, buffer, buffer_len);
+ close(fd);
+
+ return ret;
+}
+
+static bool u2f_emulated_setup_counter(const char *path,
+ struct synced_counter *counter)
+{
+ int fd, ret;
+ FILE *fp;
+
+ fd = qemu_open(path, O_RDWR);
+ if (fd < 0) {
+ return false;
+ }
+ fp = fdopen(fd, "r+");
+ if (fp == NULL) {
+ close(fd);
+ return false;
+ }
+ ret = fscanf(fp, "%u", &counter->value);
+ if (ret == EOF) {
+ fclose(fp);
+ return false;
+ }
+ counter->fp = fp;
+ counter->vdev_counter.counter_increment = counter_increment;
+ counter->vdev_counter.counter_read = counter_read;
+
+ return true;
+}
+
+static u2f_emu_rc u2f_emulated_setup_vdev_manualy(U2FEmulatedState *key)
+{
+ ssize_t ret;
+ char cert_pem[4096], privkey_pem[2048];
+ struct u2f_emu_vdev_setup setup_info;
+
+ /* Certificate */
+ ret = u2f_emulated_read(key->cert, cert_pem, sizeof(cert_pem));
+ if (ret < 0) {
+ return -1;
+ }
+
+ /* Private key */
+ ret = u2f_emulated_read(key->privkey, privkey_pem, sizeof(privkey_pem));
+ if (ret < 0) {
+ return -1;
+ }
+
+ /* Entropy */
+ ret = u2f_emulated_read(key->entropy, (char *)&setup_info.entropy,
+ sizeof(setup_info.entropy));
+ if (ret < 0) {
+ return -1;
+ }
+
+ /* Counter */
+ if (!u2f_emulated_setup_counter(key->counter, &key->synced_counter)) {
+ return -1;
+ }
+
+ /* Setup */
+ setup_info.certificate = cert_pem;
+ setup_info.private_key = privkey_pem;
+ setup_info.counter = (struct u2f_emu_vdev_counter *)&key->synced_counter;
+
+ return u2f_emu_vdev_new(&key->vdev, &setup_info);
+}
+
+static void u2f_emulated_event_handler(EventNotifier *notifier)
+{
+ U2FEmulatedState *key = container_of(notifier, U2FEmulatedState, notifier);
+ size_t packet_size;
+ uint8_t *packet_in = NULL;
+
+ event_notifier_test_and_clear(&key->notifier);
+ qemu_mutex_lock(&key->vdev_mutex);
+ while (u2f_emu_vdev_has_response(key->vdev, U2F_EMU_USB)) {
+ packet_size = u2f_emu_vdev_get_response(key->vdev, U2F_EMU_USB,
+ &packet_in);
+ if (packet_size == U2FHID_PACKET_SIZE) {
+ u2f_send_to_guest(&key->base, packet_in);
+ }
+ u2f_emu_vdev_free_response(packet_in);
+ }
+ qemu_mutex_unlock(&key->vdev_mutex);
+}
+
+static void u2f_emulated_realize(U2FKeyState *base, Error **errp)
+{
+ U2FEmulatedState *key = EMULATED_U2F_KEY(base);
+ u2f_emu_rc rc;
+
+ if (key->cert != NULL || key->privkey != NULL || key->entropy != NULL
+ || key->counter != NULL) {
+ if (key->cert != NULL && key->privkey != NULL
+ && key->entropy != NULL && key->counter != NULL) {
+ rc = u2f_emulated_setup_vdev_manualy(key);
+ } else {
+ error_setg(errp, "%s: cert, priv, entropy and counter "
+ "parameters must be provided to manualy configure "
+ "the emulated device", TYPE_U2F_EMULATED);
+ return;
+ }
+ } else if (key->dir != NULL) {
+ rc = u2f_emu_vdev_new_from_dir(&key->vdev, key->dir);
+ } else {
+ rc = u2f_emu_vdev_new_ephemeral(&key->vdev);
+ }
+
+ if (rc != U2F_EMU_OK) {
+ error_setg(errp, "%s: Failed to setup the key", TYPE_U2F_EMULATED);
+ return;
+ }
+
+ if (event_notifier_init(&key->notifier, false) < 0) {
+ error_setg(errp, "%s: Failed to initialize notifier",
+ TYPE_U2F_EMULATED);
+ return;
+ }
+ /* Notifier */
+ event_notifier_set_handler(&key->notifier, u2f_emulated_event_handler);
+
+ /* Synchronization */
+ qemu_cond_init(&key->key_cond);
+ qemu_mutex_init(&key->vdev_mutex);
+ qemu_mutex_init(&key->pending_out_mutex);
+ qemu_mutex_init(&key->key_mutex);
+ u2f_emulated_reset(key);
+
+ /* Thread */
+ key->stop_thread = false;
+ qemu_thread_create(&key->key_thread, "u2f-key", u2f_emulated_thread,
+ key, QEMU_THREAD_JOINABLE);
+}
+
+static void u2f_emulated_unrealize(U2FKeyState *base)
+{
+ U2FEmulatedState *key = EMULATED_U2F_KEY(base);
+
+ /* Thread */
+ key->stop_thread = true;
+ qemu_cond_signal(&key->key_cond);
+ qemu_thread_join(&key->key_thread);
+
+ /* Notifier */
+ event_notifier_set_handler(&key->notifier, NULL);
+ event_notifier_cleanup(&key->notifier);
+
+ /* Synchronization */
+ qemu_cond_destroy(&key->key_cond);
+ qemu_mutex_destroy(&key->vdev_mutex);
+ qemu_mutex_destroy(&key->key_mutex);
+ qemu_mutex_destroy(&key->pending_out_mutex);
+
+ /* Vdev */
+ u2f_emu_vdev_free(key->vdev);
+ if (key->synced_counter.fp != NULL) {
+ fclose(key->synced_counter.fp);
+ }
+}
+
+static Property u2f_emulated_properties[] = {
+ DEFINE_PROP_STRING("dir", U2FEmulatedState, dir),
+ DEFINE_PROP_STRING("cert", U2FEmulatedState, cert),
+ DEFINE_PROP_STRING("privkey", U2FEmulatedState, privkey),
+ DEFINE_PROP_STRING("entropy", U2FEmulatedState, entropy),
+ DEFINE_PROP_STRING("counter", U2FEmulatedState, counter),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void u2f_emulated_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ U2FKeyClass *kc = U2F_KEY_CLASS(klass);
+
+ kc->realize = u2f_emulated_realize;
+ kc->unrealize = u2f_emulated_unrealize;
+ kc->recv_from_guest = u2f_emulated_recv_from_guest;
+ dc->desc = "QEMU U2F emulated key";
+ device_class_set_props(dc, u2f_emulated_properties);
+}
+
+static const TypeInfo u2f_key_emulated_info = {
+ .name = TYPE_U2F_EMULATED,
+ .parent = TYPE_U2F_KEY,
+ .instance_size = sizeof(U2FEmulatedState),
+ .class_init = u2f_emulated_class_init
+};
+
+static void u2f_key_emulated_register_types(void)
+{
+ type_register_static(&u2f_key_emulated_info);
+}
+
+type_init(u2f_key_emulated_register_types)
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 11/18] meson: Add U2F key to meson
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (9 preceding siblings ...)
2020-08-31 8:32 ` [PULL 10/18] hw/usb: Add U2F key emulated mode Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 12/18] docs/system: Add U2F key to the USB devices examples Gerd Hoffmann
` (7 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-8-cesar.belley@lse.epita.fr
[ fixes suggested by paolo ]
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
configure | 8 +++++++-
meson_options.txt | 1 +
hw/usb/Kconfig | 5 +++++
hw/usb/meson.build | 7 +++++++
meson.build | 7 +++++++
5 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 6ecaff429b1b..8dc981684bb9 100755
--- a/configure
+++ b/configure
@@ -495,6 +495,7 @@ trace_file="trace"
spice=""
rbd=""
smartcard=""
+u2f="auto"
libusb=""
usb_redir=""
opengl=""
@@ -1415,6 +1416,10 @@ for opt do
;;
--enable-smartcard) smartcard="yes"
;;
+ --disable-u2f) u2f="disabled"
+ ;;
+ --enable-u2f) u2f="enabled"
+ ;;
--disable-libusb) libusb="no"
;;
--enable-libusb) libusb="yes"
@@ -1945,6 +1950,7 @@ disabled with --disable-FEATURE, default is enabled if available:
libiscsi iscsi support
libnfs nfs support
smartcard smartcard support (libcacard)
+ u2f U2F support (u2f-emu)
libusb libusb (for usb passthrough)
live-block-migration Block migration in the main migration stream
usb-redir usb network redirection support
@@ -8229,7 +8235,7 @@ NINJA=${ninja:-$PWD/ninjatool} $meson setup \
-Db_coverage=$(if test "$gcov" = yes; then echo true; else echo false; fi) \
-Dsdl=$sdl -Dsdl_image=$sdl_image \
-Dvnc=$vnc -Dvnc_sasl=$vnc_sasl -Dvnc_jpeg=$vnc_jpeg -Dvnc_png=$vnc_png \
- -Dgettext=$gettext -Dxkbcommon=$xkbcommon \
+ -Dgettext=$gettext -Dxkbcommon=$xkbcommon -Du2f=$u2f\
$cross_arg \
"$PWD" "$source_path"
diff --git a/meson_options.txt b/meson_options.txt
index c55f9cd94cb2..aef2de652332 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,6 +1,7 @@
option('gettext', type : 'boolean', value : true)
option('sdl', type : 'feature', value : 'auto')
option('sdl_image', type : 'feature', value : 'auto')
+option('u2f', type : 'feature', value : 'auto')
option('vnc', type : 'feature', value : 'enabled')
option('vnc_jpeg', type : 'feature', value : 'auto')
option('vnc_png', type : 'feature', value : 'auto')
diff --git a/hw/usb/Kconfig b/hw/usb/Kconfig
index 5e63dc75f815..3fc8fbe3c74c 100644
--- a/hw/usb/Kconfig
+++ b/hw/usb/Kconfig
@@ -96,6 +96,11 @@ config USB_STORAGE_MTP
default y
depends on USB
+config USB_U2F
+ bool
+ default y
+ depends on USB
+
config IMX_USBPHY
bool
default y
diff --git a/hw/usb/meson.build b/hw/usb/meson.build
index 3c44a1b06954..a25109b88c91 100644
--- a/hw/usb/meson.build
+++ b/hw/usb/meson.build
@@ -50,6 +50,13 @@ if config_host.has_key('CONFIG_SMARTCARD')
hw_usb_modules += {'smartcard': usbsmartcard_ss}
endif
+# U2F
+softmmu_ss.add(when: 'CONFIG_USB_U2F', if_true: files('u2f.c'))
+softmmu_ss.add(when: ['CONFIG_LINUX', 'CONFIG_USB_U2F'], if_true: files('u2f-passthru.c'))
+if u2f.found()
+ softmmu_ss.add(when: 'CONFIG_USB_U2F', if_true: [u2f, files('u2f-emulated.c')])
+endif
+
# usb redirect
if config_host.has_key('CONFIG_USB_REDIR')
usbredir_ss = ss.source_set()
diff --git a/meson.build b/meson.build
index 74f8ea0c2e11..1e7aee85e33a 100644
--- a/meson.build
+++ b/meson.build
@@ -377,6 +377,12 @@ if 'CONFIG_SMARTCARD' in config_host
cacard = declare_dependency(compile_args: config_host['SMARTCARD_CFLAGS'].split(),
link_args: config_host['SMARTCARD_LIBS'].split())
endif
+u2f = not_found
+if have_system
+ u2f = dependency('u2f-emu', required: get_option('u2f'),
+ method: 'pkg-config',
+ static: enable_static)
+endif
usbredir = not_found
if 'CONFIG_USB_REDIR' in config_host
usbredir = declare_dependency(compile_args: config_host['USB_REDIR_CFLAGS'].split(),
@@ -1375,6 +1381,7 @@ summary_info += {'spice support': config_host.has_key('CONFIG_SPICE')}
summary_info += {'rbd support': config_host.has_key('CONFIG_RBD')}
summary_info += {'xfsctl support': config_host.has_key('CONFIG_XFS')}
summary_info += {'smartcard support': config_host.has_key('CONFIG_SMARTCARD')}
+summary_info += {'U2F support': u2f.found()}
summary_info += {'libusb': config_host.has_key('CONFIG_USB_LIBUSB')}
summary_info += {'usb net redir': config_host.has_key('CONFIG_USB_REDIR')}
summary_info += {'OpenGL support': config_host.has_key('CONFIG_OPENGL')}
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 12/18] docs/system: Add U2F key to the USB devices examples
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (10 preceding siblings ...)
2020-08-31 8:32 ` [PULL 11/18] meson: Add U2F key to meson Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 13/18] docs/qdev-device-use.txt: Add USB U2F key to the QDEV " Gerd Hoffmann
` (6 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-9-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
docs/system/usb.rst | 3 +++
1 file changed, 3 insertions(+)
diff --git a/docs/system/usb.rst b/docs/system/usb.rst
index ddfa828d74ae..9a2f1927c451 100644
--- a/docs/system/usb.rst
+++ b/docs/system/usb.rst
@@ -81,6 +81,9 @@ option or the ``device_add`` monitor command. Available devices are:
``usb-audio``
USB audio device
+``u2f-{emulated,passthru}``
+ Universal Second Factor device
+
.. _host_005fusb_005fdevices:
Using host USB devices on a Linux host
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 13/18] docs/qdev-device-use.txt: Add USB U2F key to the QDEV devices examples
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (11 preceding siblings ...)
2020-08-31 8:32 ` [PULL 12/18] docs/system: Add U2F key to the USB devices examples Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 14/18] scripts: Add u2f-setup-gen script Gerd Hoffmann
` (5 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-10-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
docs/qdev-device-use.txt | 1 +
1 file changed, 1 insertion(+)
diff --git a/docs/qdev-device-use.txt b/docs/qdev-device-use.txt
index f8d0d2fe297a..9889521e3c07 100644
--- a/docs/qdev-device-use.txt
+++ b/docs/qdev-device-use.txt
@@ -325,6 +325,7 @@ The new way is -device DEVNAME,DEV-OPTS... Details depend on DRIVER:
* mouse -device usb-mouse
* tablet -device usb-tablet
* wacom-tablet -device usb-wacom-tablet
+* u2f -device u2f-{emulated,passthru}
* braille See "Character Devices"
=== Watchdog Devices ===
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 14/18] scripts: Add u2f-setup-gen script
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (12 preceding siblings ...)
2020-08-31 8:32 ` [PULL 13/18] docs/qdev-device-use.txt: Add USB U2F key to the QDEV " Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 15/18] hw/usb: Add U2F device check to passthru mode Gerd Hoffmann
` (4 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds the script used to generate setup directories, needed
for the device u2f-emulated configuration in directory mode:
python u2f-setup-gen.py $DIR
qemu -usb -device u2f-emulated,dir=$DIR
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-11-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
scripts/u2f-setup-gen.py | 170 +++++++++++++++++++++++++++++++++++++++
1 file changed, 170 insertions(+)
create mode 100755 scripts/u2f-setup-gen.py
diff --git a/scripts/u2f-setup-gen.py b/scripts/u2f-setup-gen.py
new file mode 100755
index 000000000000..2122598fed8e
--- /dev/null
+++ b/scripts/u2f-setup-gen.py
@@ -0,0 +1,170 @@
+#!/usr/bin/env python3
+#
+# Libu2f-emu setup directory generator for USB U2F key emulation.
+#
+# Copyright (c) 2020 César Belley <cesar.belley@lse.epita.fr>
+# Written by César Belley <cesar.belley@lse.epita.fr>
+#
+# This work is licensed under the terms of the GNU GPL, version 2
+# or, at your option, any later version. See the COPYING file in
+# the top-level directory.
+
+import sys
+import os
+from random import randint
+from typing import Tuple
+
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives.asymmetric import ec
+from cryptography.hazmat.primitives.serialization import Encoding, \
+ NoEncryption, PrivateFormat, PublicFormat
+from OpenSSL import crypto
+
+
+def write_setup_dir(dirpath: str, privkey_pem: bytes, cert_pem: bytes,
+ entropy: bytes, counter: int) -> None:
+ """
+ Write the setup directory.
+
+ Args:
+ dirpath: The directory path.
+ key_pem: The private key PEM.
+ cert_pem: The certificate PEM.
+ entropy: The 48 bytes of entropy.
+ counter: The counter value.
+ """
+ # Directory
+ os.mkdir(dirpath)
+
+ # Private key
+ with open(f'{dirpath}/private-key.pem', 'bw') as f:
+ f.write(privkey_pem)
+
+ # Certificate
+ with open(f'{dirpath}/certificate.pem', 'bw') as f:
+ f.write(cert_pem)
+
+ # Entropy
+ with open(f'{dirpath}/entropy', 'wb') as f:
+ f.write(entropy)
+
+ # Counter
+ with open(f'{dirpath}/counter', 'w') as f:
+ f.write(f'{str(counter)}\n')
+
+
+def generate_ec_key_pair() -> Tuple[str, str]:
+ """
+ Generate an ec key pair.
+
+ Returns:
+ The private and public key PEM.
+ """
+ # Key generation
+ privkey = ec.generate_private_key(ec.SECP256R1, default_backend())
+ pubkey = privkey.public_key()
+
+ # PEM serialization
+ privkey_pem = privkey.private_bytes(encoding=Encoding.PEM,
+ format=PrivateFormat.TraditionalOpenSSL,
+ encryption_algorithm=NoEncryption())
+ pubkey_pem = pubkey.public_bytes(encoding=Encoding.PEM,
+ format=PublicFormat.SubjectPublicKeyInfo)
+ return privkey_pem, pubkey_pem
+
+
+def generate_certificate(privkey_pem: str, pubkey_pem: str) -> str:
+ """
+ Generate a x509 certificate from a key pair.
+
+ Args:
+ privkey_pem: The private key PEM.
+ pubkey_pem: The public key PEM.
+
+ Returns:
+ The certificate PEM.
+ """
+ # Convert key pair
+ privkey = crypto.load_privatekey(crypto.FILETYPE_PEM, privkey_pem)
+ pubkey = crypto.load_publickey(crypto.FILETYPE_PEM, pubkey_pem)
+
+ # New x509v3 certificate
+ cert = crypto.X509()
+ cert.set_version(0x2)
+
+ # Serial number
+ cert.set_serial_number(randint(1, 2 ** 64))
+
+ # Before / After
+ cert.gmtime_adj_notBefore(0)
+ cert.gmtime_adj_notAfter(4 * (365 * 24 * 60 * 60))
+
+ # Public key
+ cert.set_pubkey(pubkey)
+
+ # Subject name and issueer
+ cert.get_subject().CN = "U2F emulated"
+ cert.set_issuer(cert.get_subject())
+
+ # Extensions
+ cert.add_extensions([
+ crypto.X509Extension(b"subjectKeyIdentifier",
+ False, b"hash", subject=cert),
+ ])
+ cert.add_extensions([
+ crypto.X509Extension(b"authorityKeyIdentifier",
+ False, b"keyid:always", issuer=cert),
+ ])
+ cert.add_extensions([
+ crypto.X509Extension(b"basicConstraints", True, b"CA:TRUE")
+ ])
+
+ # Signature
+ cert.sign(privkey, 'sha256')
+
+ return crypto.dump_certificate(crypto.FILETYPE_PEM, cert)
+
+
+def generate_setup_dir(dirpath: str) -> None:
+ """
+ Generates the setup directory.
+
+ Args:
+ dirpath: The directory path.
+ """
+ # Key pair
+ privkey_pem, pubkey_pem = generate_ec_key_pair()
+
+ # Certificate
+ certificate_pem = generate_certificate(privkey_pem, pubkey_pem)
+
+ # Entropy
+ entropy = os.urandom(48)
+
+ # Counter
+ counter = 0
+
+ # Write
+ write_setup_dir(dirpath, privkey_pem, certificate_pem, entropy, counter)
+
+
+def main() -> None:
+ """
+ Main function
+ """
+ # Dir path
+ if len(sys.argv) != 2:
+ sys.stderr.write(f'Usage: {sys.argv[0]} <setup_dir>\n')
+ exit(2)
+ dirpath = sys.argv[1]
+
+ # Dir non existence
+ if os.path.exists(dirpath):
+ sys.stderr.write(f'Directory: {dirpath} already exists.\n')
+ exit(1)
+
+ generate_setup_dir(dirpath)
+
+
+if __name__ == '__main__':
+ main()
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 15/18] hw/usb: Add U2F device check to passthru mode
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (13 preceding siblings ...)
2020-08-31 8:32 ` [PULL 14/18] scripts: Add u2f-setup-gen script Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:32 ` [PULL 16/18] hw/usb: Add U2F device autoscan " Gerd Hoffmann
` (3 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patchs adds a check to verify that the device passed through the
hidraw property is a U2F device.
The check is done by ensuring that the first values of the report
descriptor (USAGE PAGE and USAGE) correspond to those of a U2F device.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-12-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
hw/usb/u2f-passthru.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/hw/usb/u2f-passthru.c b/hw/usb/u2f-passthru.c
index 52b44670775d..74d4ae6e9294 100644
--- a/hw/usb/u2f-passthru.c
+++ b/hw/usb/u2f-passthru.c
@@ -34,6 +34,12 @@
#include "u2f.h"
+#ifdef CONFIG_LIBUDEV
+#include <libudev.h>
+#endif
+#include <linux/hidraw.h>
+#include <sys/ioctl.h>
+
#define NONCE_SIZE 8
#define BROADCAST_CID 0xFFFFFFFF
#define TRANSACTION_TIMEOUT 120000
@@ -344,6 +350,34 @@ static void u2f_passthru_recv_from_guest(U2FKeyState *base,
}
}
+static bool u2f_passthru_is_u2f_device(int fd)
+{
+ int ret, rdesc_size;
+ struct hidraw_report_descriptor rdesc;
+ const uint8_t u2f_hid_report_desc_header[] = {
+ 0x06, 0xd0, 0xf1, /* Usage Page (FIDO) */
+ 0x09, 0x01, /* Usage (FIDO) */
+ };
+
+ /* Get report descriptor size */
+ ret = ioctl(fd, HIDIOCGRDESCSIZE, &rdesc_size);
+ if (ret < 0 || rdesc_size < sizeof(u2f_hid_report_desc_header)) {
+ return false;
+ }
+
+ /* Get report descriptor */
+ memset(&rdesc, 0x0, sizeof(rdesc));
+ rdesc.size = rdesc_size;
+ ret = ioctl(fd, HIDIOCGRDESC, &rdesc);
+ if (ret < 0) {
+ return false;
+ }
+
+ /* Header bytes cover specific U2F rdesc values */
+ return memcmp(u2f_hid_report_desc_header, rdesc.value,
+ sizeof(u2f_hid_report_desc_header)) == 0;
+}
+
static void u2f_passthru_unrealize(U2FKeyState *base)
{
U2FPassthruState *key = PASSTHRU_U2F_KEY(base);
@@ -368,6 +402,13 @@ static void u2f_passthru_realize(U2FKeyState *base, Error **errp)
key->hidraw);
return;
}
+
+ if (!u2f_passthru_is_u2f_device(fd)) {
+ qemu_close(fd);
+ error_setg(errp, "%s: Passed hidraw does not represent "
+ "a U2F HID device", TYPE_U2F_PASSTHRU);
+ return;
+ }
key->hidraw_fd = fd;
u2f_passthru_reset(key);
}
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 16/18] hw/usb: Add U2F device autoscan to passthru mode
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (14 preceding siblings ...)
2020-08-31 8:32 ` [PULL 15/18] hw/usb: Add U2F device check to passthru mode Gerd Hoffmann
@ 2020-08-31 8:32 ` Gerd Hoffmann
2020-08-31 8:33 ` [PULL 17/18] usb-host: workaround libusb bug Gerd Hoffmann
` (2 subsequent siblings)
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:32 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, César Belley, Gerd Hoffmann,
Cleber Rosa, Paolo Bonzini, Eduardo Habkost
From: César Belley <cesar.belley@lse.epita.fr>
This patch adds an autoscan to let u2f-passthru choose the first U2F
device it finds.
The autoscan is performed using libudev with an enumeration of all the
hidraw devices present on the host.
The first device which happens to be a U2F device is taken to do the
passtru.
Signed-off-by: César Belley <cesar.belley@lse.epita.fr>
Message-id: 20200826114209.28821-13-cesar.belley@lse.epita.fr
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
docs/u2f.txt | 9 ++++
hw/usb/u2f-passthru.c | 113 +++++++++++++++++++++++++++++++++++++-----
hw/usb/meson.build | 2 +-
3 files changed, 110 insertions(+), 14 deletions(-)
diff --git a/docs/u2f.txt b/docs/u2f.txt
index f60052882ec3..8f44994818a2 100644
--- a/docs/u2f.txt
+++ b/docs/u2f.txt
@@ -42,6 +42,10 @@ on libu2f-emu: configuring and building:
./configure --enable-u2f && make
+The pass-through mode is built by default on Linux. To take advantage
+of the autoscan option it provides, make sure you have a working libudev
+installed on the host.
+
3. Using u2f-emulated
@@ -90,6 +94,11 @@ On the host specify the u2f-passthru device with a suitable hidraw:
qemu -usb -device u2f-passthru,hidraw=/dev/hidraw0
+Alternately, the u2f-passthru device can autoscan to take the first
+U2F device it finds on the host (this requires a working libudev):
+
+ qemu -usb -device u2f-passthru
+
5. Libu2f-emu
diff --git a/hw/usb/u2f-passthru.c b/hw/usb/u2f-passthru.c
index 74d4ae6e9294..e9c8aa459586 100644
--- a/hw/usb/u2f-passthru.c
+++ b/hw/usb/u2f-passthru.c
@@ -378,6 +378,84 @@ static bool u2f_passthru_is_u2f_device(int fd)
sizeof(u2f_hid_report_desc_header)) == 0;
}
+#ifdef CONFIG_LIBUDEV
+static int u2f_passthru_open_from_device(struct udev_device *device)
+{
+ const char *devnode = udev_device_get_devnode(device);
+
+ int fd = qemu_open(devnode, O_RDWR);
+ if (fd < 0) {
+ return -1;
+ } else if (!u2f_passthru_is_u2f_device(fd)) {
+ qemu_close(fd);
+ return -1;
+ }
+ return fd;
+}
+
+static int u2f_passthru_open_from_enumerate(struct udev *udev,
+ struct udev_enumerate *enumerate)
+{
+ struct udev_list_entry *devices, *entry;
+ int ret, fd;
+
+ ret = udev_enumerate_scan_devices(enumerate);
+ if (ret < 0) {
+ return -1;
+ }
+
+ devices = udev_enumerate_get_list_entry(enumerate);
+ udev_list_entry_foreach(entry, devices) {
+ struct udev_device *device;
+ const char *syspath = udev_list_entry_get_name(entry);
+
+ if (syspath == NULL) {
+ continue;
+ }
+
+ device = udev_device_new_from_syspath(udev, syspath);
+ if (device == NULL) {
+ continue;
+ }
+
+ fd = u2f_passthru_open_from_device(device);
+ udev_device_unref(device);
+ if (fd >= 0) {
+ return fd;
+ }
+ }
+ return -1;
+}
+
+static int u2f_passthru_open_from_scan(void)
+{
+ struct udev *udev;
+ struct udev_enumerate *enumerate;
+ int ret, fd = -1;
+
+ udev = udev_new();
+ if (udev == NULL) {
+ return -1;
+ }
+
+ enumerate = udev_enumerate_new(udev);
+ if (enumerate == NULL) {
+ udev_unref(udev);
+ return -1;
+ }
+
+ ret = udev_enumerate_add_match_subsystem(enumerate, "hidraw");
+ if (ret >= 0) {
+ fd = u2f_passthru_open_from_enumerate(udev, enumerate);
+ }
+
+ udev_enumerate_unref(enumerate);
+ udev_unref(udev);
+
+ return fd;
+}
+#endif
+
static void u2f_passthru_unrealize(U2FKeyState *base)
{
U2FPassthruState *key = PASSTHRU_U2F_KEY(base);
@@ -392,22 +470,31 @@ static void u2f_passthru_realize(U2FKeyState *base, Error **errp)
int fd;
if (key->hidraw == NULL) {
+#ifdef CONFIG_LIBUDEV
+ fd = u2f_passthru_open_from_scan();
+ if (fd < 0) {
+ error_setg(errp, "%s: Failed to find a U2F USB device",
+ TYPE_U2F_PASSTHRU);
+ return;
+ }
+#else
error_setg(errp, "%s: Missing hidraw", TYPE_U2F_PASSTHRU);
return;
- }
+#endif
+ } else {
+ fd = qemu_open(key->hidraw, O_RDWR);
+ if (fd < 0) {
+ error_setg(errp, "%s: Failed to open %s", TYPE_U2F_PASSTHRU,
+ key->hidraw);
+ return;
+ }
- fd = qemu_open(key->hidraw, O_RDWR);
- if (fd < 0) {
- error_setg(errp, "%s: Failed to open %s", TYPE_U2F_PASSTHRU,
- key->hidraw);
- return;
- }
-
- if (!u2f_passthru_is_u2f_device(fd)) {
- qemu_close(fd);
- error_setg(errp, "%s: Passed hidraw does not represent "
- "a U2F HID device", TYPE_U2F_PASSTHRU);
- return;
+ if (!u2f_passthru_is_u2f_device(fd)) {
+ qemu_close(fd);
+ error_setg(errp, "%s: Passed hidraw does not represent "
+ "a U2F HID device", TYPE_U2F_PASSTHRU);
+ return;
+ }
}
key->hidraw_fd = fd;
u2f_passthru_reset(key);
diff --git a/hw/usb/meson.build b/hw/usb/meson.build
index a25109b88c91..b7c7ff23bfbd 100644
--- a/hw/usb/meson.build
+++ b/hw/usb/meson.build
@@ -52,7 +52,7 @@ endif
# U2F
softmmu_ss.add(when: 'CONFIG_USB_U2F', if_true: files('u2f.c'))
-softmmu_ss.add(when: ['CONFIG_LINUX', 'CONFIG_USB_U2F'], if_true: files('u2f-passthru.c'))
+softmmu_ss.add(when: ['CONFIG_LINUX', 'CONFIG_USB_U2F'], if_true: [libudev, files('u2f-passthru.c')])
if u2f.found()
softmmu_ss.add(when: 'CONFIG_USB_U2F', if_true: [u2f, files('u2f-emulated.c')])
endif
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 17/18] usb-host: workaround libusb bug
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (15 preceding siblings ...)
2020-08-31 8:32 ` [PULL 16/18] hw/usb: Add U2F device autoscan " Gerd Hoffmann
@ 2020-08-31 8:33 ` Gerd Hoffmann
2020-08-31 8:33 ` [PULL 18/18] usb: fix setup_len init (CVE-2020-14364) Gerd Hoffmann
2020-08-31 21:15 ` [PULL 00/18] Usb 20200831 patches Peter Maydell
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:33 UTC (permalink / raw)
To: qemu-devel
Cc: Paolo Bonzini, Daniel P. Berrangé, Gerd Hoffmann,
Eduardo Habkost, Cleber Rosa
libusb_get_device_speed() does not work for
libusb_wrap_sys_device() devices in v1.0.23.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1871090
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200824110057.32089-1-kraxel@redhat.com
---
hw/usb/host-libusb.c | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index c474551d8456..08604f787fdf 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -39,6 +39,11 @@
#endif
#include <libusb.h>
+#ifdef CONFIG_LINUX
+#include <sys/ioctl.h>
+#include <linux/usbdevice_fs.h>
+#endif
+
#include "qapi/error.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
@@ -885,6 +890,7 @@ static void usb_host_ep_update(USBHostDevice *s)
static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
{
USBDevice *udev = USB_DEVICE(s);
+ int libusb_speed;
int bus_num = 0;
int addr = 0;
int rc;
@@ -935,7 +941,36 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
usb_ep_init(udev);
usb_host_ep_update(s);
- udev->speed = speed_map[libusb_get_device_speed(dev)];
+ libusb_speed = libusb_get_device_speed(dev);
+#ifdef CONFIG_LINUX
+ if (hostfd && libusb_speed == 0) {
+ /*
+ * Workaround libusb bug: libusb_get_device_speed() does not
+ * work for libusb_wrap_sys_device() devices in v1.0.23.
+ *
+ * Speeds are defined in linux/usb/ch9.h, file not included
+ * due to name conflicts.
+ */
+ int rc = ioctl(hostfd, USBDEVFS_GET_SPEED, NULL);
+ switch (rc) {
+ case 1: /* low */
+ libusb_speed = LIBUSB_SPEED_LOW;
+ break;
+ case 2: /* full */
+ libusb_speed = LIBUSB_SPEED_FULL;
+ break;
+ case 3: /* high */
+ case 4: /* wireless */
+ libusb_speed = LIBUSB_SPEED_HIGH;
+ break;
+ case 5: /* super */
+ case 6: /* super plus */
+ libusb_speed = LIBUSB_SPEED_SUPER;
+ break;
+ }
+ }
+#endif
+ udev->speed = speed_map[libusb_speed];
usb_host_speed_compat(s);
if (s->ddesc.iProduct) {
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* [PULL 18/18] usb: fix setup_len init (CVE-2020-14364)
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (16 preceding siblings ...)
2020-08-31 8:33 ` [PULL 17/18] usb-host: workaround libusb bug Gerd Hoffmann
@ 2020-08-31 8:33 ` Gerd Hoffmann
2020-08-31 21:15 ` [PULL 00/18] Usb 20200831 patches Peter Maydell
18 siblings, 0 replies; 22+ messages in thread
From: Gerd Hoffmann @ 2020-08-31 8:33 UTC (permalink / raw)
To: qemu-devel
Cc: Daniel P. Berrangé, Eduardo Habkost, Li Qiang, Gonglei,
Gerd Hoffmann, Cleber Rosa, Paolo Bonzini
Store calculated setup_len in a local variable, verify it, and only
write it to the struct (USBDevice->setup_len) in case it passed the
sanity checks.
This prevents other code (do_token_{in,out} functions specifically)
from working with invalid USBDevice->setup_len values and overrunning
the USBDevice->setup_buf[] buffer.
Fixes: CVE-2020-14364
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Message-id: 20200825053636.29648-1-kraxel@redhat.com
---
hw/usb/core.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/hw/usb/core.c b/hw/usb/core.c
index 5abd128b6bc5..5234dcc73fea 100644
--- a/hw/usb/core.c
+++ b/hw/usb/core.c
@@ -129,6 +129,7 @@ void usb_wakeup(USBEndpoint *ep, unsigned int stream)
static void do_token_setup(USBDevice *s, USBPacket *p)
{
int request, value, index;
+ unsigned int setup_len;
if (p->iov.size != 8) {
p->status = USB_RET_STALL;
@@ -138,14 +139,15 @@ static void do_token_setup(USBDevice *s, USBPacket *p)
usb_packet_copy(p, s->setup_buf, p->iov.size);
s->setup_index = 0;
p->actual_length = 0;
- s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
- if (s->setup_len > sizeof(s->data_buf)) {
+ setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
+ if (setup_len > sizeof(s->data_buf)) {
fprintf(stderr,
"usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
- s->setup_len, sizeof(s->data_buf));
+ setup_len, sizeof(s->data_buf));
p->status = USB_RET_STALL;
return;
}
+ s->setup_len = setup_len;
request = (s->setup_buf[0] << 8) | s->setup_buf[1];
value = (s->setup_buf[3] << 8) | s->setup_buf[2];
@@ -259,26 +261,28 @@ static void do_token_out(USBDevice *s, USBPacket *p)
static void do_parameter(USBDevice *s, USBPacket *p)
{
int i, request, value, index;
+ unsigned int setup_len;
for (i = 0; i < 8; i++) {
s->setup_buf[i] = p->parameter >> (i*8);
}
s->setup_state = SETUP_STATE_PARAM;
- s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
s->setup_index = 0;
request = (s->setup_buf[0] << 8) | s->setup_buf[1];
value = (s->setup_buf[3] << 8) | s->setup_buf[2];
index = (s->setup_buf[5] << 8) | s->setup_buf[4];
- if (s->setup_len > sizeof(s->data_buf)) {
+ setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
+ if (setup_len > sizeof(s->data_buf)) {
fprintf(stderr,
"usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
- s->setup_len, sizeof(s->data_buf));
+ setup_len, sizeof(s->data_buf));
p->status = USB_RET_STALL;
return;
}
+ s->setup_len = setup_len;
if (p->pid == USB_TOKEN_OUT) {
usb_packet_copy(p, s->data_buf, s->setup_len);
--
2.27.0
^ permalink raw reply related [flat|nested] 22+ messages in thread* Re: [PULL 00/18] Usb 20200831 patches
2020-08-31 8:32 [PULL 00/18] Usb 20200831 patches Gerd Hoffmann
` (17 preceding siblings ...)
2020-08-31 8:33 ` [PULL 18/18] usb: fix setup_len init (CVE-2020-14364) Gerd Hoffmann
@ 2020-08-31 21:15 ` Peter Maydell
18 siblings, 0 replies; 22+ messages in thread
From: Peter Maydell @ 2020-08-31 21:15 UTC (permalink / raw)
To: Gerd Hoffmann
Cc: Paolo Bonzini, Cleber Rosa, Daniel P. Berrangé,
QEMU Developers, Eduardo Habkost
On Mon, 31 Aug 2020 at 09:41, Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> The following changes since commit 39335fab59e11cfda9b7cf63929825db2dd3a3e0:
>
> Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-5.2-pull-=
> request' into staging (2020-08-28 22:30:11 +0100)
>
> are available in the Git repository at:
>
> git://git.kraxel.org/qemu tags/usb-20200831-pull-request
>
> for you to fetch changes up to b946434f2659a182afc17e155be6791ebfb302eb:
>
> usb: fix setup_len init (CVE-2020-14364) (2020-08-31 08:23:39 +0200)
>
> ----------------------------------------------------------------
> usb: usb_packet_map fixes for ehci and xhci.
> usb: setup_len fix (CVE-2020-14364).
> usb: u2f key support (GSoC).
> * v2: 32bit build fixed.
> * v3: libu2f-emu dependency fixed.
Applied, thanks.
Please update the changelog at https://wiki.qemu.org/ChangeLog/5.2
for any user-visible changes.
-- PMM
^ permalink raw reply [flat|nested] 22+ messages in thread