From e3043123f5a9dec70cad50b0c84dac6064fda885 Mon Sep 17 00:00:00 2001 From: Benjamin Berg Date: Fri, 15 May 2020 21:06:24 +0200 Subject: [PATCH] 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. --- libfprint/drivers/virtual-sdcp.c | 676 +++++++++++++++++++++++++++++++ libfprint/meson.build | 3 + meson.build | 2 +- 3 files changed, 680 insertions(+), 1 deletion(-) create mode 100644 libfprint/drivers/virtual-sdcp.c diff --git a/libfprint/drivers/virtual-sdcp.c b/libfprint/drivers/virtual-sdcp.c new file mode 100644 index 0000000..02da3da --- /dev/null +++ b/libfprint/drivers/virtual-sdcp.c @@ -0,0 +1,676 @@ +/* + * Virtual driver for SDCP device debugging + * + * Copyright (C) 2020 Benjamin Berg + * + * 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 +#include + +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[] = { + 0x30, 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0xCB, 0x1F, 0x0A, 0x37, 0x62, 0xB1, 0x8E, 0xCE, 0xD9, 0x9A, 0x9E, 0xAC, 0xE6, + 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, "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, "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, "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, "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, "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, "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; +} diff --git a/libfprint/meson.build b/libfprint/meson.build index efe228f..70b85bd 100644 --- a/libfprint/meson.build +++ b/libfprint/meson.build @@ -123,6 +123,8 @@ driver_sources = { [ 'drivers/virtual-device.c' ], 'virtual_device_storage' : [ 'drivers/virtual-device-storage.c' ], + 'virtual_sdcp' : + [ 'drivers/virtual-sdcp.c' ], 'synaptics' : [ 'drivers/synaptics/synaptics.c', 'drivers/synaptics/bmkt_message.c' ], 'goodixmoc' : @@ -153,6 +155,7 @@ driver_helpers = { 'virtual_image' : [ 'virtual' ], 'virtual_device' : [ 'virtual' ], 'virtual_device_storage' : [ 'virtual' ], + 'virtual_sdcp' : [ 'sdcp' ], } helpers = [] diff --git a/meson.build b/meson.build index d7fff25..4c79a2a 100644 --- a/meson.build +++ b/meson.build @@ -92,8 +92,8 @@ virtual_drivers = [ 'virtual_image', 'virtual_device', 'virtual_device_storage', + 'virtual_sdcp', ] - default_drivers = [ 'upektc_img', 'vfs5011',