trezor-firmware/firmware/fsm.c

/*
 * This file is part of the TREZOR project, https://trezor.io/
 *
 * Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <libopencm3/stm32/flash.h>

#include "trezor.h"
#include "fsm.h"
#include "messages.h"
#include "bip32.h"
#include "storage.h"
#include "coins.h"
#include "debug.h"
#include "transaction.h"
#include "rng.h"
#include "storage.h"
#include "oled.h"
#include "protect.h"
#include "pinmatrix.h"
#include "layout2.h"
#include "address.h"
#include "base58.h"
#include "ecdsa.h"
#include "reset.h"
#include "recovery.h"
#include "memory.h"
#include "usb.h"
#include "util.h"
#include "signing.h"
#include "aes/aes.h"
#include "hmac.h"
#include "crypto.h"
#include "base58.h"
#include "bip39.h"
#include "ripemd160.h"
#include "curves.h"
#include "secp256k1.h"
#include "ethereum.h"
#include "nem.h"
#include "nem2.h"
#include "rfc6979.h"
#include "gettext.h"
#include "supervise.h"
#include "stellar.h"

// message methods

static uint8_t msg_resp[MSG_OUT_SIZE] __attribute__ ((aligned));

#define RESP_INIT(TYPE) \
			TYPE *resp = (TYPE *) (void *) msg_resp; \
			_Static_assert(sizeof(msg_resp) >= sizeof(TYPE), #TYPE " is too large"); \
			memset(resp, 0, sizeof(TYPE));

#define CHECK_INITIALIZED \
	if (!storage_isInitialized()) { \
		fsm_sendFailure(FailureType_Failure_NotInitialized, NULL); \
		return; \
	}

#define CHECK_NOT_INITIALIZED \
	if (storage_isInitialized()) { \
		fsm_sendFailure(FailureType_Failure_UnexpectedMessage, _("Device is already initialized. Use Wipe first.")); \
		return; \
	}

#define CHECK_PIN \
	if (!protectPin(true)) { \
		layoutHome(); \
		return; \
	}

#define CHECK_PIN_UNCACHED \
	if (!protectPin(false)) { \
		layoutHome(); \
		return; \
	}

#define CHECK_PARAM(cond, errormsg) \
	if (!(cond)) { \
		fsm_sendFailure(FailureType_Failure_DataError, (errormsg)); \
		layoutHome(); \
		return; \
	}

void fsm_sendSuccess(const char *text)
{
	RESP_INIT(Success);
	if (text) {
		resp->has_message = true;
		strlcpy(resp->message, text, sizeof(resp->message));
	}
	msg_write(MessageType_MessageType_Success, resp);
}

#if DEBUG_LINK
void fsm_sendFailureDebug(FailureType code, const char *text, const char *source)
#else
void fsm_sendFailure(FailureType code, const char *text)
#endif
{
	if (protectAbortedByInitialize) {
		fsm_msgInitialize((Initialize *)0);
		protectAbortedByInitialize = false;
		return;
	}
	RESP_INIT(Failure);
	resp->has_code = true;
	resp->code = code;
	if (!text) {
		switch (code) {
			case FailureType_Failure_UnexpectedMessage:
				text = _("Unexpected message");
				break;
			case FailureType_Failure_ButtonExpected:
				text = _("Button expected");
				break;
			case FailureType_Failure_DataError:
				text = _("Data error");
				break;
			case FailureType_Failure_ActionCancelled:
				text = _("Action cancelled by user");
				break;
			case FailureType_Failure_PinExpected:
				text = _("PIN expected");
				break;
			case FailureType_Failure_PinCancelled:
				text = _("PIN cancelled");
				break;
			case FailureType_Failure_PinInvalid:
				text = _("PIN invalid");
				break;
			case FailureType_Failure_InvalidSignature:
				text = _("Invalid signature");
				break;
			case FailureType_Failure_ProcessError:
				text = _("Process error");
				break;
			case FailureType_Failure_NotEnoughFunds:
				text = _("Not enough funds");
				break;
			case FailureType_Failure_NotInitialized:
				text = _("Device not initialized");
				break;
			case FailureType_Failure_PinMismatch:
				text = _("PIN mismatch");
				break;
			case FailureType_Failure_FirmwareError:
				text = _("Firmware error");
				break;
		}
	}
#if DEBUG_LINK
	resp->has_message = true;
	strlcpy(resp->message, source, sizeof(resp->message));
	if (text) {
		strlcat(resp->message, text, sizeof(resp->message));
	}
#else
	if (text) {
		resp->has_message = true;
		strlcpy(resp->message, text, sizeof(resp->message));
	}
#endif
	msg_write(MessageType_MessageType_Failure, resp);
}

static const CoinInfo *fsm_getCoin(bool has_name, const char *name)
{
	const CoinInfo *coin;
	if (has_name) {
		coin = coinByName(name);
	} else {
		coin = coinByName("Bitcoin");
	}
	if (!coin) {
		fsm_sendFailure(FailureType_Failure_DataError, _("Invalid coin name"));
		layoutHome();
		return 0;
	}
	return coin;
}

static HDNode *fsm_getDerivedNode(const char *curve, const uint32_t *address_n, size_t address_n_count, uint32_t *fingerprint)
{
	static CONFIDENTIAL HDNode node;
	if (fingerprint) {
		*fingerprint = 0;
	}
	if (!storage_getRootNode(&node, curve, true)) {
		fsm_sendFailure(FailureType_Failure_NotInitialized, _("Device not initialized or passphrase request cancelled or unsupported curve"));
		layoutHome();
		return 0;
	}
	if (!address_n || address_n_count == 0) {
		return &node;
	}
	if (hdnode_private_ckd_cached(&node, address_n, address_n_count, fingerprint) == 0) {
		fsm_sendFailure(FailureType_Failure_ProcessError, _("Failed to derive private key"));
		layoutHome();
		return 0;
	}
	return &node;
}

static bool fsm_layoutAddress(const char *address, const char *desc, bool ignorecase, size_t prefixlen, const uint32_t *address_n, size_t address_n_count)
{
	bool qrcode = false;
	for (;;) {
		const char* display_addr = address;
		if (prefixlen && !qrcode) {
			display_addr += prefixlen;
		}
		layoutAddress(display_addr, desc, qrcode, ignorecase, address_n, address_n_count);
		if (protectButton(ButtonRequestType_ButtonRequest_Address, false)) {
			return true;
		}
		if (protectAbortedByInitialize) {
			fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
			layoutHome();
			return false;
		}
		qrcode = !qrcode;
	}
}

#include "fsm_msg_common.h"
#include "fsm_msg_coin.h"
#include "fsm_msg_ethereum.h"
#include "fsm_msg_crypto.h"
#include "fsm_msg_nem.h"
#include "fsm_msg_stellar.h"
#include "fsm_msg_debug.h"