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trezor-firmware/legacy/firmware/fsm.c

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/*
* 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 "address.h"
#include "aes/aes.h"
#include "base58.h"
#include "bip32.h"
#include "bip39.h"
#include "coins.h"
#include "config.h"
#include "crypto.h"
#include "curves.h"
#include "debug.h"
#include "ecdsa.h"
#include "fsm.h"
#include "fw_signatures.h"
#include "gettext.h"
#include "hmac.h"
#include "layout2.h"
#include "memory.h"
#include "memzero.h"
#include "messages.h"
#include "messages.pb.h"
#include "oled.h"
#include "pinmatrix.h"
#include "protect.h"
#include "recovery.h"
#include "reset.h"
#include "rng.h"
#include "secp256k1.h"
#include "signing.h"
#include "supervise.h"
#include "timer.h"
#include "transaction.h"
#include "trezor.h"
#include "usb.h"
#include "util.h"
#if !BITCOIN_ONLY
#include "ethereum.h"
#include "ethereum_definitions.h"
#include "ethereum_networks.h"
#include "nem.h"
#include "nem2.h"
#include "stellar.h"
#endif
#if EMULATOR
#include <stdio.h>
#endif
// message methods
static uint8_t msg_resp[MSG_OUT_DECODED_SIZE] __attribute__((aligned));
// Authorization message type triggered by DoPreauthorized.
static MessageType authorization_type = 0;
static uint32_t unlock_path = 0;
#define RESP_INIT(TYPE) \
TYPE *resp = (TYPE *)(void *)msg_resp; \
_Static_assert(sizeof(msg_resp) >= sizeof(TYPE), #TYPE " is too large"); \
memzero(resp, sizeof(TYPE));
#define CHECK_INITIALIZED \
if (!config_isInitialized()) { \
fsm_sendFailure(FailureType_Failure_NotInitialized, NULL); \
return; \
}
#define CHECK_NOT_INITIALIZED \
if (config_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_UNLOCKED \
if (!session_isUnlocked()) { \
fsm_sendFailure(FailureType_Failure_ProcessError, _("Locked")); \
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 (protectAbortedByCancel) {
protectAbortedByCancel = false;
}
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_WipeCodeMismatch:
text = _("Wipe code mismatch");
break;
case FailureType_Failure_InvalidSession:
text = _("Invalid session");
break;
case FailureType_Failure_ThpUnallocatedSession:
text = _("Unallocated session");
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 = NULL;
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 (!config_getRootNode(&node, 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_getSlip21Key(const char *path[], size_t path_count,
uint8_t key[32]) {
const uint8_t *seed = config_getSeed();
if (seed == NULL) {
return false;
}
static CONFIDENTIAL Slip21Node node;
slip21_from_seed(seed, 64, &node);
for (size_t i = 0; i < path_count; ++i) {
slip21_derive_path(&node, (uint8_t *)path[i], strlen(path[i]));
}
memcpy(key, slip21_key(&node), 32);
memzero(&node, sizeof(node));
return true;
}
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 address_is_account,
const MultisigRedeemScriptType *multisig,
int multisig_index, uint32_t multisig_xpub_magic,
const CoinInfo *coin) {
int screen = 0, screens = 2;
if (multisig) {
screens += 2 * cryptoMultisigPubkeyCount(multisig);
}
for (;;) {
switch (screen) {
case 0: { // show address
const char *display_addr = address;
// strip cashaddr prefix
if (prefixlen) {
display_addr += prefixlen;
}
layoutAddress(display_addr, desc, false, ignorecase, address_n,
address_n_count, address_is_account);
break;
}
case 1: { // show QR code
layoutAddress(address, desc, true, ignorecase, address_n,
address_n_count, address_is_account);
break;
}
default: { // show XPUBs
int index = (screen - 2) / 2;
int page = (screen - 2) % 2;
char xpub[XPUB_MAXLEN] = {0};
const HDNodeType *node_ptr = NULL;
if (multisig->nodes_count) { // use multisig->nodes
node_ptr = &(multisig->nodes[index]);
} else if (multisig->pubkeys_count) { // use multisig->pubkeys
node_ptr = &(multisig->pubkeys[index].node);
}
if (!node_ptr) {
strlcat(xpub, "ERROR", sizeof(xpub));
} else {
HDNode node;
if (!hdnode_from_xpub(node_ptr->depth, node_ptr->child_num,
node_ptr->chain_code.bytes,
node_ptr->public_key.bytes, coin->curve_name,
&node)) {
strlcat(xpub, "ERROR", sizeof(xpub));
} else {
hdnode_serialize_public(&node, node_ptr->fingerprint,
multisig_xpub_magic, xpub, sizeof(xpub));
}
}
layoutXPUBMultisig(xpub, index, page, multisig_index == index);
break;
}
}
if (protectButton(ButtonRequestType_ButtonRequest_Address, false)) {
return true;
}
if (protectAbortedByCancel || protectAbortedByInitialize) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
layoutHome();
return false;
}
screen = (screen + 1) % screens;
}
}
static bool fsm_layoutPaginated(const char *description, const uint8_t *msg,
uint32_t len, bool is_ascii) {
const char **str = NULL;
const uint32_t row_len = is_ascii ? 18 : 8;
do {
const uint32_t show_len = MIN(len, row_len * 4);
if (is_ascii) {
str = split_message(msg, show_len, row_len);
} else {
str = split_message_hex(msg, show_len);
}
msg += show_len;
len -= show_len;
const char *label = len > 0 ? _("Next") : _("Confirm");
layoutDialogSwipeEx(&bmp_icon_question, _("Cancel"), label, description,
str[0], str[1], str[2], str[3], NULL, NULL, FONT_FIXED);
if (!protectButton(ButtonRequestType_ButtonRequest_Other, false)) {
return false;
}
} while (len > 0);
return true;
}
bool fsm_layoutSignMessage(const uint8_t *msg, uint32_t len) {
if (is_valid_ascii(msg, len)) {
return fsm_layoutPaginated(_("Sign message?"), msg, len, true);
} else {
return fsm_layoutPaginated(_("Sign binary message?"), msg, len, false);
}
}
bool fsm_layoutVerifyMessage(const uint8_t *msg, uint32_t len) {
if (is_valid_ascii(msg, len)) {
return fsm_layoutPaginated(_("Verified message?"), msg, len, true);
} else {
return fsm_layoutPaginated(_("Verified binary message?"), msg, len, false);
}
}
bool fsm_layoutCommitmentData(const uint8_t *msg, uint32_t len) {
if (is_valid_ascii(msg, len)) {
return fsm_layoutPaginated(_("Commitment data"), msg, len, true);
} else {
return fsm_layoutPaginated(_("Binary commitment data"), msg, len, false);
}
}
void fsm_msgRebootToBootloader(void) {
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Do you want to"), _("restart device in"),
_("bootloader mode?"), NULL, NULL, NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_ProtectCall, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
layoutHome();
return;
}
oledClear();
oledRefresh();
fsm_sendSuccess(_("Rebooting"));
// make sure the outgoing message is sent
usbFlush(500);
#if !EMULATOR
svc_reboot_to_bootloader();
#else
printf("Reboot!\n");
#endif
}
void fsm_abortWorkflows(void) {
recovery_abort();
signing_abort();
authorization_type = 0;
unlock_path = 0;
#if !BITCOIN_ONLY
ethereum_signing_abort();
stellar_signingAbort();
#endif
}
void fsm_postMsgCleanup(MessageType message_type) {
if (message_type != MessageType_MessageType_DoPreauthorized) {
authorization_type = 0;
}
if (message_type != MessageType_MessageType_UnlockPath) {
unlock_path = 0;
}
}
bool fsm_layoutPathWarning(void) {
layoutDialogSwipe(&bmp_icon_warning, _("Abort"), _("Continue"), NULL,
_("Wrong address path"), _("for selected coin."), NULL,
_("Continue at your"), _("own risk!"), NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_UnknownDerivationPath,
false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
return false;
}
return true;
}
#include "fsm_msg_coin.h"
#include "fsm_msg_common.h"
#include "fsm_msg_crypto.h"
#include "fsm_msg_debug.h"
#if !BITCOIN_ONLY
#include "fsm_msg_ethereum.h"
#include "fsm_msg_nem.h"
#include "fsm_msg_stellar.h"
#endif
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