virtual-sdcp: Add a virtual SDCP device

This device is designed to talk to an external executable. This
executable can be provided/created using the test implementation from
Microsoft.
This commit is contained in:
Benjamin Berg 2020-05-15 21:06:24 +02:00
parent aa1981e280
commit 8767796562
3 changed files with 680 additions and 1 deletions

View file

@ -0,0 +1,676 @@
/*
* Virtual driver for SDCP device debugging
*
* Copyright (C) 2020 Benjamin Berg <bberg@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* This is a virtual test driver to test the basic SDCP functionality.
* It uses the test binaries from Microsoft, which were extended to allow
* a simple chat with the device.
* The environment variable contains the to be executed binary including
* arguments. This binary should be compiled from the code in
* https://github.com/Microsoft/SecureDeviceConnectionProtocol
* or, until it is merged upstream
* https://github.com/benzea/SecureDeviceConnectionProtocol
*
* Note that using this as an external executable has the advantage that we
* do not need to link against mbedtls or any other crypto library.
*/
#define FP_COMPONENT "virtual_sdcp"
#include "fpi-log.h"
#include "fpi-ssm.h"
#include "../fpi-sdcp-device.h"
#include <glib/gstdio.h>
#include <gio/gio.h>
struct _FpDeviceVirtualSdcp
{
FpSdcpDevice parent;
GSubprocess *proc;
GOutputStream *proc_stdin;
GInputStream *proc_stdout;
/* Only valid while a read/write is pending */
GByteArray *msg_out;
GByteArray *msg_in;
GByteArray *connect_msg;
};
G_DECLARE_FINAL_TYPE (FpDeviceVirtualSdcp, fpi_device_virtual_sdcp, FPI, DEVICE_VIRTUAL_SDCP, FpSdcpDevice)
G_DEFINE_TYPE (FpDeviceVirtualSdcp, fpi_device_virtual_sdcp, FP_TYPE_SDCP_DEVICE)
guint8 ca_1[] = {
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0x04
};
guint8 ca_2[] = {
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0x1A, 0xD4, 0xB8, 0xF1, 0xA8, 0x2B, 0xB1, 0xB4, 0x40, 0x9B
};
static void
msg_written_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GError *error = NULL;
GOutputStream *stream = G_OUTPUT_STREAM (source_object);
FpiSsm *ssm = user_data;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (fpi_ssm_get_device (ssm));
g_clear_pointer (&self->msg_out, g_byte_array_unref);
g_assert (self->msg_out == NULL);
if (!g_output_stream_write_all_finish (stream, res, NULL, &error))
{
fpi_ssm_mark_failed (ssm, error);
return;
}
fpi_ssm_next_state (ssm);
}
static void
msg_received_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GError *error = NULL;
GInputStream *stream = G_INPUT_STREAM (source_object);
FpiSsm *ssm = user_data;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (fpi_ssm_get_device (ssm));
gsize read;
g_assert (self->msg_out == NULL);
if (!g_input_stream_read_all_finish (stream, res, &read, &error) ||
read != self->msg_in->len)
{
g_clear_pointer (&self->msg_in, g_byte_array_unref);
if (!error)
error = fpi_device_error_new_msg (FP_DEVICE_ERROR_PROTO,
"Received EOF while reading from test binary.");
fpi_ssm_mark_failed (ssm, error);
return;
}
fpi_ssm_next_state (ssm);
}
enum {
SEND_MESSAGE,
RECV_MESSAGE,
SEND_RECV_STATES
};
static void
send_recv_ssm (FpiSsm *ssm, FpDevice *dev)
{
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
switch (fpi_ssm_get_cur_state (ssm))
{
case SEND_MESSAGE:
g_output_stream_write_all_async (self->proc_stdin,
self->msg_out->data,
self->msg_out->len,
G_PRIORITY_DEFAULT,
fpi_device_get_cancellable (FP_DEVICE (dev)),
msg_written_cb,
ssm);
break;
case RECV_MESSAGE:
g_input_stream_read_all_async (self->proc_stdout,
self->msg_in->data,
self->msg_in->len,
G_PRIORITY_DEFAULT,
fpi_device_get_cancellable (FP_DEVICE (dev)),
msg_received_cb,
ssm);
break;
}
}
static void
connect_2_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
g_autoptr(GBytes) recv_data = NULL;
g_autoptr(GBytes) r_d = NULL;
g_autoptr(FpiSdcpClaim) claim = NULL;
g_autoptr(GBytes) mac = NULL;
g_autoptr(GBytes) ca_1_bytes = NULL, ca_2_bytes = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
guint16 cert_size;
if (error)
{
fpi_sdcp_device_connect_complete (FP_SDCP_DEVICE (dev), NULL, NULL, NULL, error);
g_clear_pointer (&self->connect_msg, g_byte_array_unref);
return;
}
memcpy (&cert_size, self->connect_msg->data + 32, 2);
g_byte_array_append (self->connect_msg, self->msg_in->data, self->msg_in->len);
g_clear_pointer (&self->msg_in, g_byte_array_unref);
/* Double check that the size is correct. */
g_assert (self->connect_msg->len == 32 + (2 + cert_size + 65 + 65 + 32 + 64 + 64) + 32);
recv_data = g_byte_array_free_to_bytes (g_steal_pointer (&self->connect_msg));
claim = fpi_sdcp_claim_new ();
r_d = g_bytes_new_from_bytes (recv_data, 0, 32);
claim->cert_m = g_bytes_new_from_bytes (recv_data, 34, cert_size);
claim->pk_d = g_bytes_new_from_bytes (recv_data, 34 + cert_size, 65);
claim->pk_f = g_bytes_new_from_bytes (recv_data, 34 + cert_size + 65, 65);
claim->h_f = g_bytes_new_from_bytes (recv_data, 34 + cert_size + 65 + 65, 32);
claim->s_m = g_bytes_new_from_bytes (recv_data, 34 + cert_size + 65 + 65 + 32, 64);
claim->s_d = g_bytes_new_from_bytes (recv_data, 34 + cert_size + 65 + 65 + 32 + 64, 64);
mac = g_bytes_new_from_bytes (recv_data, 34 + cert_size + 65 + 65 + 32 + 64 + 64, 32);
ca_1_bytes = g_bytes_new_static (ca_1, G_N_ELEMENTS (ca_1));
ca_2_bytes = g_bytes_new_static (ca_2, G_N_ELEMENTS (ca_2));
fpi_sdcp_device_set_intermediat_cas (FP_SDCP_DEVICE (dev),
ca_1_bytes,
ca_2_bytes);
fpi_sdcp_device_connect_complete (FP_SDCP_DEVICE (dev), r_d, claim, mac, NULL);
}
static void
connect_1_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
guint16 cert_size;
if (error)
{
fpi_sdcp_device_connect_complete (FP_SDCP_DEVICE (dev), NULL, NULL, NULL, error);
return;
}
g_clear_pointer (&self->connect_msg, g_byte_array_unref);
self->connect_msg = g_steal_pointer (&self->msg_in);
memcpy (&cert_size, self->connect_msg->data + 32, 2);
/* Nothing to send and the rest to receive. */
self->msg_out = g_byte_array_new ();
self->msg_in = g_byte_array_new ();
g_byte_array_set_size (self->msg_in, 32 + (2 + cert_size + 65 + 65 + 32 + 64 + 64) + 32 - self->connect_msg->len);
/* New SSM */
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "connect 2");
fpi_ssm_start (ssm, connect_2_cb);
}
static void
connect (FpSdcpDevice *dev)
{
g_autoptr(GBytes) r_h = NULL;
g_autoptr(GBytes) pk_h = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
FpiSsm *ssm;
G_DEBUG_HERE ();
g_assert (self->proc);
g_assert (self->connect_msg == NULL);
fpi_sdcp_device_get_connect_data (dev, &r_h, &pk_h);
self->msg_out = g_byte_array_new ();
g_byte_array_append (self->msg_out, (const guint8 *) "C", 1);
g_byte_array_append (self->msg_out,
g_bytes_get_data (r_h, NULL),
g_bytes_get_size (r_h));
g_byte_array_append (self->msg_out,
g_bytes_get_data (pk_h, NULL),
g_bytes_get_size (pk_h));
self->msg_in = g_byte_array_new ();
g_byte_array_set_size (self->msg_in, 34);
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "connect");
fpi_ssm_start (ssm, connect_1_cb);
}
static void
reconnect_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
g_autoptr(GBytes) mac = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
if (error)
{
fpi_sdcp_device_reconnect_complete (FP_SDCP_DEVICE (dev), mac, error);
return;
}
mac = g_byte_array_free_to_bytes (g_steal_pointer (&self->msg_in));
fpi_sdcp_device_reconnect_complete (FP_SDCP_DEVICE (dev), mac, NULL);
}
static void
reconnect (FpSdcpDevice *dev)
{
g_autoptr(GBytes) r_h = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
FpiSsm *ssm;
G_DEBUG_HERE ();
g_assert (self->proc);
fpi_sdcp_device_get_reconnect_data (dev, &r_h);
self->msg_out = g_byte_array_new ();
g_byte_array_append (self->msg_out, (const guint8 *) "R", 1);
g_byte_array_append (self->msg_out,
g_bytes_get_data (r_h, NULL),
g_bytes_get_size (r_h));
self->msg_in = g_byte_array_new ();
g_byte_array_set_size (self->msg_in, 32);
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "connect 2");
fpi_ssm_start (ssm, reconnect_cb);
}
static void
enroll_begin_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
g_autoptr(GBytes) nonce = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
if (error)
{
fpi_sdcp_device_enroll_ready (FP_SDCP_DEVICE (dev), error);
return;
}
nonce = g_byte_array_free_to_bytes (g_steal_pointer (&self->msg_in));
fpi_sdcp_device_enroll_set_nonce (FP_SDCP_DEVICE (dev), nonce);
/* Claim that we completed one enroll step. */
fpi_device_enroll_progress (dev, 1, NULL, NULL);
/* And signal that we are ready to commit. */
fpi_sdcp_device_enroll_ready (FP_SDCP_DEVICE (dev), NULL);
}
static void
enroll_begin (FpSdcpDevice *dev)
{
g_autoptr(GBytes) r_h = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
FpiSsm *ssm;
G_DEBUG_HERE ();
g_assert (self->proc);
fpi_sdcp_device_get_reconnect_data (dev, &r_h);
self->msg_out = g_byte_array_new ();
g_byte_array_append (self->msg_out, (const guint8 *) "E", 1);
/* Expect 32 byte nonce */
self->msg_in = g_byte_array_new ();
g_byte_array_set_size (self->msg_in, 32);
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "enroll_begin");
fpi_ssm_start (ssm, enroll_begin_cb);
}
static void
enroll_commit_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
g_clear_pointer (&self->msg_in, g_byte_array_unref);
if (error)
{
fpi_sdcp_device_enroll_ready (FP_SDCP_DEVICE (dev), error);
return;
}
/* Signal that we have committed. We don't expect a response
* from the virtual device (even though that is kind of broken).
*/
fpi_sdcp_device_enroll_commit_complete (FP_SDCP_DEVICE (dev), NULL);
}
static void
enroll_commit (FpSdcpDevice *dev, GBytes *id_in)
{
g_autoptr(GBytes) r_h = NULL;
g_autoptr(GBytes) id = id_in;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
FpiSsm *ssm;
G_DEBUG_HERE ();
g_assert (self->proc);
fpi_sdcp_device_get_reconnect_data (dev, &r_h);
self->msg_out = g_byte_array_new ();
self->msg_in = g_byte_array_new ();
if (id)
{
g_byte_array_append (self->msg_out, (const guint8 *) "F", 1);
g_byte_array_append (self->msg_out,
g_bytes_get_data (id, NULL),
g_bytes_get_size (id));
/* NOTE: No response from device, assume commit works. */
}
else
{
/* Cancel enroll (does not receive a reply) */
g_byte_array_append (self->msg_out, (const guint8 *) "G", 1);
/* NOTE: No response from device, assume cancellation works. */
}
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "enroll_commit");
fpi_ssm_start (ssm, enroll_commit_cb);
}
static void
identify_cb (FpiSsm *ssm, FpDevice *dev, GError *error)
{
g_autoptr(GBytes) reply = NULL;
g_autoptr(GBytes) id = NULL;
g_autoptr(GBytes) mac = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
if (error)
{
fpi_sdcp_device_identify_complete (FP_SDCP_DEVICE (dev), NULL, NULL, error);
return;
}
reply = g_byte_array_free_to_bytes (g_steal_pointer (&self->msg_in));
id = g_bytes_new_from_bytes (reply, 0, 32);
mac = g_bytes_new_from_bytes (reply, 32, 32);
fpi_sdcp_device_identify_complete (FP_SDCP_DEVICE (self), id, mac, NULL);
}
static void
identify (FpSdcpDevice *dev)
{
g_autoptr(GBytes) nonce = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
FpiSsm *ssm;
G_DEBUG_HERE ();
g_assert (self->proc);
fpi_sdcp_device_get_identify_data (dev, &nonce);
self->msg_out = g_byte_array_new ();
g_byte_array_append (self->msg_out, (const guint8 *) "I", 1);
g_byte_array_append (self->msg_out, g_bytes_get_data (nonce, NULL), g_bytes_get_size (nonce));
/* Expect 64 byte nonce */
self->msg_in = g_byte_array_new ();
g_byte_array_set_size (self->msg_in, 64);
ssm = fpi_ssm_new_full (FP_DEVICE (dev), send_recv_ssm, SEND_RECV_STATES, SEND_RECV_STATES, "identify");
fpi_ssm_start (ssm, identify_cb);
}
static void
probe (FpDevice *dev)
{
g_auto(GStrv) argv = NULL;
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (dev);
GError *error = NULL;
const char *env;
/* We launch the test binary alread at probe time and quit only when
* the object is finalized. This allows testing reconnect properly.
*
* Also, we'll fail probe if something goes wrong executing it.
*/
env = fpi_device_get_virtual_env (FP_DEVICE (self));
if (!g_shell_parse_argv (env, NULL, &argv, &error))
goto out;
self->proc = g_subprocess_newv ((const char * const *) argv,
G_SUBPROCESS_FLAGS_STDIN_PIPE | G_SUBPROCESS_FLAGS_STDOUT_PIPE,
&error);
if (!self->proc)
goto out;
self->proc_stdin = g_object_ref (g_subprocess_get_stdin_pipe (self->proc));
self->proc_stdout = g_object_ref (g_subprocess_get_stdout_pipe (self->proc));
out:
fpi_device_probe_complete (dev, "virtual-sdcp", NULL, error);
}
static void
dev_close (FpDevice *dev)
{
/* No-op, needs to be defined. */
fpi_device_close_complete (dev, NULL);
}
static void
fpi_device_virtual_sdcp_init (FpDeviceVirtualSdcp *self)
{
}
static void
fpi_device_virtual_sdcp_finalize (GObject *obj)
{
FpDeviceVirtualSdcp *self = FPI_DEVICE_VIRTUAL_SDCP (obj);
/* Just kill the subprocess, no need to be graceful here. */
if (self->proc)
g_subprocess_force_exit (self->proc);
g_clear_object (&self->proc);
g_clear_object (&self->proc_stdin);
g_clear_object (&self->proc_stdout);
G_OBJECT_CLASS (fpi_device_virtual_sdcp_parent_class)->finalize (obj);
}
static const FpIdEntry driver_ids[] = {
{ .virtual_envvar = "FP_VIRTUAL_SDCP" },
{ .virtual_envvar = NULL }
};
static void
fpi_device_virtual_sdcp_class_init (FpDeviceVirtualSdcpClass *klass)
{
GObjectClass *obj_class = G_OBJECT_CLASS (klass);
FpDeviceClass *dev_class = FP_DEVICE_CLASS (klass);
FpSdcpDeviceClass *sdcp_class = FP_SDCP_DEVICE_CLASS (klass);
obj_class->finalize = fpi_device_virtual_sdcp_finalize;
dev_class->id = FP_COMPONENT;
dev_class->full_name = "Virtual SDCP device talking to MS test code";
dev_class->type = FP_DEVICE_TYPE_VIRTUAL;
dev_class->id_table = driver_ids;
dev_class->nr_enroll_stages = 1;
/* The SDCP base class may need to override this in the long run */
dev_class->probe = probe;
dev_class->close = dev_close;
sdcp_class->connect = connect;
sdcp_class->reconnect = reconnect;
sdcp_class->enroll_begin = enroll_begin;
sdcp_class->enroll_commit = enroll_commit;
sdcp_class->identify = identify;
}

View file

@ -131,6 +131,8 @@ driver_sources = {
[ 'drivers/virtual-device.c' ], [ 'drivers/virtual-device.c' ],
'virtual_device_storage' : 'virtual_device_storage' :
[ 'drivers/virtual-device-storage.c' ], [ 'drivers/virtual-device-storage.c' ],
'virtual_sdcp' :
[ 'drivers/virtual-sdcp.c' ],
'synaptics' : 'synaptics' :
[ 'drivers/synaptics/synaptics.c', 'drivers/synaptics/bmkt_message.c' ], [ 'drivers/synaptics/synaptics.c', 'drivers/synaptics/bmkt_message.c' ],
'goodixmoc' : 'goodixmoc' :

View file

@ -96,8 +96,8 @@ virtual_drivers = [
'virtual_image', 'virtual_image',
'virtual_device', 'virtual_device',
'virtual_device_storage', 'virtual_device_storage',
'virtual_sdcp',
] ]
default_drivers = [ default_drivers = [
'upektc_img', 'upektc_img',
'vfs5011', 'vfs5011',
@ -157,6 +157,7 @@ driver_helper_mapping = {
'virtual_image' : [ 'virtual' ], 'virtual_image' : [ 'virtual' ],
'virtual_device' : [ 'virtual' ], 'virtual_device' : [ 'virtual' ],
'virtual_device_storage' : [ 'virtual' ], 'virtual_device_storage' : [ 'virtual' ],
'virtual_sdcp' : [ 'sdcp' ],
} }
driver_helpers = [] driver_helpers = []