/* * 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, 0x82, 0x03, 0xFD, 0x30, 0x82, 0x03, 0x82, 0xA0, 0x03, 0x02, 0x01, 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(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; }