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trezor-firmware/legacy/firmware/ethereum.c
Andrew Kozlik 0af5cd18c2 feat(legacy): Strict path validation for Ethereum.
2022-05-03 21:50:50 +02:00

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2016 Alex Beregszaszi <alex@rtfs.hu>
* Copyright (C) 2016 Pavol Rusnak <stick@satoshilabs.com>
* Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.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 "ethereum.h"
#include "address.h"
#include "crypto.h"
#include "ecdsa.h"
#include "ethereum_networks.h"
#include "ethereum_tokens.h"
#include "fsm.h"
#include "gettext.h"
#include "layout2.h"
#include "memzero.h"
#include "messages.h"
#include "messages.pb.h"
#include "protect.h"
#include "secp256k1.h"
#include "sha3.h"
#include "transaction.h"
#include "util.h"
#ifdef USE_SECP256K1_ZKP_ECDSA
#include "zkp_ecdsa.h"
#endif
/* Maximum chain_id which returns the full signature_v (which must fit into an
uint32). chain_ids larger than this will only return one bit and the caller must
recalculate the full value: v = 2 * chain_id + 35 + v_bit */
#define MAX_CHAIN_ID ((0xFFFFFFFF - 36) >> 1)
#define EIP1559_TX_TYPE 2
static bool ethereum_signing = false;
static uint32_t data_total, data_left;
static EthereumTxRequest msg_tx_request;
static CONFIDENTIAL uint8_t privkey[32];
static uint64_t chain_id;
static bool eip1559;
struct SHA3_CTX keccak_ctx = {0};
static uint32_t signing_access_list_count;
static EthereumAccessList signing_access_list[8];
_Static_assert(sizeof(signing_access_list) ==
sizeof(((EthereumSignTxEIP1559 *)NULL)->access_list),
"access_list buffer size mismatch");
struct signing_params {
bool pubkeyhash_set;
uint8_t pubkeyhash[20];
uint64_t chain_id;
uint32_t data_length;
uint32_t data_initial_chunk_size;
const uint8_t *data_initial_chunk_bytes;
bool has_to;
const char *to;
const TokenType *token;
uint32_t value_size;
const uint8_t *value_bytes;
};
static inline void hash_data(const uint8_t *buf, size_t size) {
sha3_Update(&keccak_ctx, buf, size);
}
/*
* Push an RLP encoded length to the hash buffer.
*/
static void hash_rlp_length(uint32_t length, uint8_t firstbyte) {
uint8_t buf[4] = {0};
if (length == 1 && firstbyte <= 0x7f) {
/* empty length header */
} else if (length <= 55) {
buf[0] = 0x80 + length;
hash_data(buf, 1);
} else if (length <= 0xff) {
buf[0] = 0xb7 + 1;
buf[1] = length;
hash_data(buf, 2);
} else if (length <= 0xffff) {
buf[0] = 0xb7 + 2;
buf[1] = length >> 8;
buf[2] = length & 0xff;
hash_data(buf, 3);
} else {
buf[0] = 0xb7 + 3;
buf[1] = length >> 16;
buf[2] = length >> 8;
buf[3] = length & 0xff;
hash_data(buf, 4);
}
}
/*
* Push an RLP encoded list length to the hash buffer.
*/
static void hash_rlp_list_length(uint32_t length) {
uint8_t buf[4] = {0};
if (length <= 55) {
buf[0] = 0xc0 + length;
hash_data(buf, 1);
} else if (length <= 0xff) {
buf[0] = 0xf7 + 1;
buf[1] = length;
hash_data(buf, 2);
} else if (length <= 0xffff) {
buf[0] = 0xf7 + 2;
buf[1] = length >> 8;
buf[2] = length & 0xff;
hash_data(buf, 3);
} else {
buf[0] = 0xf7 + 3;
buf[1] = length >> 16;
buf[2] = length >> 8;
buf[3] = length & 0xff;
hash_data(buf, 4);
}
}
/*
* Push an RLP encoded length field and data to the hash buffer.
*/
static void hash_rlp_field(const uint8_t *buf, size_t size) {
hash_rlp_length(size, buf[0]);
hash_data(buf, size);
}
/*
* Push an RLP encoded number to the hash buffer.
* Ethereum yellow paper says to convert to big endian and strip leading zeros.
*/
static void hash_rlp_number(uint64_t number) {
if (!number) {
return;
}
uint8_t data[8] = {0};
data[0] = (number >> 56) & 0xff;
data[1] = (number >> 48) & 0xff;
data[2] = (number >> 40) & 0xff;
data[3] = (number >> 32) & 0xff;
data[4] = (number >> 24) & 0xff;
data[5] = (number >> 16) & 0xff;
data[6] = (number >> 8) & 0xff;
data[7] = (number)&0xff;
int offset = 0;
while (!data[offset]) {
offset++;
}
hash_rlp_field(data + offset, 8 - offset);
}
/*
* Calculate the number of bytes needed for an RLP length header.
* NOTE: supports up to 16MB of data (how unlikely...)
* FIXME: improve
*/
static int rlp_calculate_length(int length, uint8_t firstbyte) {
if (length == 1 && firstbyte <= 0x7f) {
return 1;
} else if (length <= 55) {
return 1 + length;
} else if (length <= 0xff) {
return 2 + length;
} else if (length <= 0xffff) {
return 3 + length;
} else {
return 4 + length;
}
}
/* If number is less than 0x80 the RLP encoding is iteself (1 byte).
* If it is 0x80 or larger, RLP encoding is 1 + length in bytes.
*/
static int rlp_calculate_number_length(uint64_t number) {
int length = 1;
if (number >= 0x80) {
while (number) {
length++;
number = number >> 8;
}
}
return length;
}
static uint32_t rlp_calculate_access_list_keys_length(
const EthereumAccessList_storage_keys_t *keys, uint32_t keys_count) {
uint32_t keys_length = 0;
for (size_t i = 0; i < keys_count; i++) {
keys_length += rlp_calculate_length(keys[i].size, keys[i].bytes[0]);
}
return keys_length;
}
static uint32_t rlp_calculate_access_list_length(
const EthereumAccessList access_list[8], uint32_t access_list_count) {
uint32_t length = 0;
for (size_t i = 0; i < access_list_count; i++) {
uint32_t address_length = rlp_calculate_length(20, 0xff);
uint32_t keys_length = rlp_calculate_access_list_keys_length(
access_list[i].storage_keys, access_list[i].storage_keys_count);
length += rlp_calculate_length(
address_length + rlp_calculate_length(keys_length, 0xff), 0xff);
}
return length;
}
static void send_request_chunk(void) {
int progress = 1000 - (data_total > 1000000 ? data_left / (data_total / 800)
: data_left * 800 / data_total);
layoutProgress(_("Signing"), progress);
msg_tx_request.has_data_length = true;
msg_tx_request.data_length = data_left <= 1024 ? data_left : 1024;
msg_write(MessageType_MessageType_EthereumTxRequest, &msg_tx_request);
}
static int ethereum_is_canonic(uint8_t v, uint8_t signature[64]) {
(void)signature;
return (v & 2) == 0;
}
static void send_signature(void) {
uint8_t hash[32] = {0}, sig[64] = {0};
uint8_t v = 0;
layoutProgress(_("Signing"), 1000);
if (eip1559) {
hash_rlp_list_length(rlp_calculate_access_list_length(
signing_access_list, signing_access_list_count));
for (size_t i = 0; i < signing_access_list_count; i++) {
uint8_t address[20] = {0};
if (!ethereum_parse(signing_access_list[i].address, address)) {
fsm_sendFailure(FailureType_Failure_DataError, _("Malformed address"));
ethereum_signing_abort();
return;
}
uint32_t address_length =
rlp_calculate_length(sizeof(address), address[0]);
uint32_t keys_length = rlp_calculate_access_list_keys_length(
signing_access_list[i].storage_keys,
signing_access_list[i].storage_keys_count);
hash_rlp_list_length(address_length +
rlp_calculate_length(keys_length, 0xff));
hash_rlp_field(address, sizeof(address));
hash_rlp_list_length(keys_length);
for (size_t j = 0; j < signing_access_list[i].storage_keys_count; j++) {
hash_rlp_field(signing_access_list[i].storage_keys[j].bytes,
signing_access_list[i].storage_keys[j].size);
}
}
} else {
/* eip-155 replay protection */
/* hash v=chain_id, r=0, s=0 */
hash_rlp_number(chain_id);
hash_rlp_length(0, 0);
hash_rlp_length(0, 0);
}
keccak_Final(&keccak_ctx, hash);
if (ecdsa_sign_digest(&secp256k1, privkey, hash, sig, &v,
ethereum_is_canonic) != 0) {
fsm_sendFailure(FailureType_Failure_ProcessError, _("Signing failed"));
ethereum_signing_abort();
return;
}
memzero(privkey, sizeof(privkey));
/* Send back the result */
msg_tx_request.has_data_length = false;
msg_tx_request.has_signature_v = true;
if (eip1559 || chain_id > MAX_CHAIN_ID) {
msg_tx_request.signature_v = v;
} else {
msg_tx_request.signature_v = v + 2 * chain_id + 35;
}
msg_tx_request.has_signature_r = true;
msg_tx_request.signature_r.size = 32;
memcpy(msg_tx_request.signature_r.bytes, sig, 32);
msg_tx_request.has_signature_s = true;
msg_tx_request.signature_s.size = 32;
memcpy(msg_tx_request.signature_s.bytes, sig + 32, 32);
msg_write(MessageType_MessageType_EthereumTxRequest, &msg_tx_request);
ethereum_signing_abort();
}
/* Format a 256 bit number (amount in wei) into a human readable format
* using standard ethereum units.
* The buffer must be at least 25 bytes.
*/
static void ethereumFormatAmount(const bignum256 *amnt, const TokenType *token,
char *buf, int buflen) {
bignum256 bn1e9 = {0};
bn_read_uint32(1000000000, &bn1e9);
const char *suffix = NULL;
int decimals = 18;
if (token == UnknownToken) {
strlcpy(buf, "Unknown token value", buflen);
return;
} else if (token != NULL) {
suffix = token->ticker;
decimals = token->decimals;
} else if (bn_is_less(amnt, &bn1e9)) {
suffix = " Wei";
decimals = 0;
} else {
ASSIGN_ETHEREUM_SUFFIX(suffix, chain_id);
}
bn_format(amnt, NULL, suffix, decimals, 0, false, buf, buflen);
}
static void layoutEthereumConfirmTx(const uint8_t *to, uint32_t to_len,
const uint8_t *value, uint32_t value_len,
const TokenType *token) {
bignum256 val = {0};
uint8_t pad_val[32] = {0};
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - value_len), value, value_len);
bn_read_be(pad_val, &val);
char amount[32] = {0};
if (token == NULL) {
if (bn_is_zero(&val)) {
strcpy(amount, _("message"));
} else {
ethereumFormatAmount(&val, NULL, amount, sizeof(amount));
}
} else {
ethereumFormatAmount(&val, token, amount, sizeof(amount));
}
char _to1[] = "to ____________";
char _to2[] = "_______________";
char _to3[] = "_______________?";
if (to_len) {
char to_str[43] = {0};
bool rskip60 = false;
// constants from trezor-common/defs/ethereum/networks.json
switch (chain_id) {
case 30:
rskip60 = true;
break;
case 31:
rskip60 = true;
break;
}
ethereum_address_checksum(to, to_str, rskip60, chain_id);
memcpy(_to1 + 3, to_str, 12);
memcpy(_to2, to_str + 12, 15);
memcpy(_to3, to_str + 27, 15);
} else {
strlcpy(_to1, _("to new contract?"), sizeof(_to1));
strlcpy(_to2, "", sizeof(_to2));
strlcpy(_to3, "", sizeof(_to3));
}
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Send"), amount, _to1, _to2, _to3, NULL);
}
static void layoutEthereumData(const uint8_t *data, uint32_t len,
uint32_t total_len) {
char hexdata[3][17] = {0};
char summary[20] = {0};
uint32_t printed = 0;
for (int i = 0; i < 3; i++) {
uint32_t linelen = len - printed;
if (linelen > 8) {
linelen = 8;
}
data2hex(data, linelen, hexdata[i]);
data += linelen;
printed += linelen;
}
strcpy(summary, "... bytes");
char *p = summary + 11;
uint32_t number = total_len;
while (number > 0) {
*p-- = '0' + number % 10;
number = number / 10;
}
char *summarystart = summary;
if (total_len == printed) summarystart = summary + 4;
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Transaction data:"), hexdata[0], hexdata[1], hexdata[2],
summarystart, NULL);
}
static void layoutEthereumFee(const uint8_t *value, uint32_t value_len,
const uint8_t *gas_price, uint32_t gas_price_len,
const uint8_t *gas_limit, uint32_t gas_limit_len,
bool is_token) {
bignum256 val = {0}, gas = {0};
uint8_t pad_val[32] = {0};
char tx_value[32] = {0};
char gas_value[32] = {0};
memzero(tx_value, sizeof(tx_value));
memzero(gas_value, sizeof(gas_value));
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - gas_price_len), gas_price, gas_price_len);
bn_read_be(pad_val, &val);
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - gas_limit_len), gas_limit, gas_limit_len);
bn_read_be(pad_val, &gas);
bn_multiply(&val, &gas, &secp256k1.prime);
ethereumFormatAmount(&gas, NULL, gas_value, sizeof(gas_value));
memzero(pad_val, sizeof(pad_val));
memcpy(pad_val + (32 - value_len), value, value_len);
bn_read_be(pad_val, &val);
if (bn_is_zero(&val)) {
strcpy(tx_value, is_token ? _("token") : _("message"));
} else {
ethereumFormatAmount(&val, NULL, tx_value, sizeof(tx_value));
}
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Really send"), tx_value, _("paying up to"), gas_value,
_("for gas?"), NULL);
}
static void layoutEthereumFeeEIP1559(const char *description,
const uint8_t *amount_bytes,
uint32_t amount_len,
const uint8_t *multiplier_bytes,
uint32_t multiplier_len) {
bignum256 amount_val = {0};
uint8_t padded[32] = {0};
char amount_str[32] = {0};
memcpy(padded + (32 - amount_len), amount_bytes, amount_len);
bn_read_be(padded, &amount_val);
if (multiplier_len > 0) {
bignum256 multiplier_val = {0};
memzero(padded, sizeof(padded));
memcpy(padded + (32 - multiplier_len), multiplier_bytes, multiplier_len);
bn_read_be(padded, &multiplier_val);
bn_multiply(&multiplier_val, &amount_val, &secp256k1.prime);
}
ethereumFormatAmount(&amount_val, NULL, amount_str, sizeof(amount_str));
layoutDialogSwipe(&bmp_icon_question, _("Cancel"), _("Confirm"), NULL,
_("Confirm fee"), description, amount_str, NULL, NULL,
NULL);
}
/*
* RLP fields:
* - nonce (0 .. 32)
* - gas_price (0 .. 32)
* - gas_limit (0 .. 32)
* - to (0, 20)
* - value (0 .. 32)
* - data (0 ..)
*/
static bool ethereum_signing_init_common(struct signing_params *params) {
ethereum_signing = true;
sha3_256_Init(&keccak_ctx);
data_total = data_left = 0;
chain_id = 0;
memzero(&msg_tx_request, sizeof(EthereumTxRequest));
memzero(signing_access_list, sizeof(signing_access_list));
signing_access_list_count = 0;
/* eip-155 chain id */
if (params->chain_id < 1) {
fsm_sendFailure(FailureType_Failure_DataError, _("Chain ID out of bounds"));
return false;
}
chain_id = params->chain_id;
if (params->data_length > 0) {
if (params->data_initial_chunk_size == 0) {
fsm_sendFailure(FailureType_Failure_DataError,
_("Data length provided, but no initial chunk"));
return false;
}
/* Our encoding only supports transactions up to 2^24 bytes. To
* prevent exceeding the limit we use a stricter limit on data length.
*/
if (params->data_length > 16000000) {
fsm_sendFailure(FailureType_Failure_DataError,
_("Data length exceeds limit"));
return false;
}
data_total = params->data_length;
} else {
data_total = 0;
}
if (params->data_initial_chunk_size > data_total) {
fsm_sendFailure(FailureType_Failure_DataError,
_("Invalid size of initial chunk"));
return false;
}
// safety checks
size_t tolen = params->has_to ? strlen(params->to) : 0;
/* Address has wrong length */
bool wrong_length = (tolen != 42 && tolen != 40 && tolen != 0);
// sending transaction to address 0 (contract creation) without a data field
bool contract_without_data = (tolen == 0 && params->data_length == 0);
if (wrong_length || contract_without_data) {
fsm_sendFailure(FailureType_Failure_DataError, _("Safety check failed"));
return false;
}
return true;
}
static void ethereum_signing_handle_erc20(struct signing_params *params) {
if (params->has_to && ethereum_parse(params->to, params->pubkeyhash)) {
params->pubkeyhash_set = true;
} else {
params->pubkeyhash_set = false;
memzero(params->pubkeyhash, sizeof(params->pubkeyhash));
}
// detect ERC-20 token
if (params->pubkeyhash_set && params->value_size == 0 && data_total == 68 &&
params->data_initial_chunk_size == 68 &&
memcmp(params->data_initial_chunk_bytes,
"\xa9\x05\x9c\xbb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
16) == 0) {
params->token = tokenByChainAddress(chain_id, params->pubkeyhash);
}
}
static bool ethereum_signing_confirm_common(
const struct signing_params *params) {
if (params->token != NULL) {
layoutEthereumConfirmTx(params->data_initial_chunk_bytes + 16, 20,
params->data_initial_chunk_bytes + 36, 32,
params->token);
} else {
layoutEthereumConfirmTx(params->pubkeyhash, 20, params->value_bytes,
params->value_size, NULL);
}
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
return false;
}
if (params->token == NULL && data_total > 0) {
layoutEthereumData(params->data_initial_chunk_bytes,
params->data_initial_chunk_size, data_total);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
return false;
}
}
return true;
}
void ethereum_signing_init(const EthereumSignTx *msg, const HDNode *node) {
struct signing_params params = {
.chain_id = msg->chain_id,
.data_length = msg->data_length,
.data_initial_chunk_size = msg->data_initial_chunk.size,
.data_initial_chunk_bytes = msg->data_initial_chunk.bytes,
.has_to = msg->has_to,
.to = msg->to,
.value_size = msg->value.size,
.value_bytes = msg->value.bytes,
};
eip1559 = false;
if (!ethereum_signing_init_common(&params)) {
ethereum_signing_abort();
return;
}
// sanity check that fee doesn't overflow
if (msg->gas_price.size + msg->gas_limit.size > 30) {
fsm_sendFailure(FailureType_Failure_DataError, _("Safety check failed"));
ethereum_signing_abort();
return;
}
uint32_t tx_type = 0;
/* Wanchain txtype */
if (msg->has_tx_type) {
if (msg->tx_type == 1 || msg->tx_type == 6) {
tx_type = msg->tx_type;
} else {
fsm_sendFailure(FailureType_Failure_DataError, _("Txtype out of bounds"));
ethereum_signing_abort();
return;
}
}
ethereum_signing_handle_erc20(&params);
if (!ethereum_signing_confirm_common(&params)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
layoutEthereumFee(msg->value.bytes, msg->value.size, msg->gas_price.bytes,
msg->gas_price.size, msg->gas_limit.bytes,
msg->gas_limit.size, params.token != NULL);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
/* Stage 1: Calculate total RLP length */
uint32_t rlp_length = 0;
layoutProgress(_("Signing"), 0);
rlp_length += rlp_calculate_length(msg->nonce.size, msg->nonce.bytes[0]);
rlp_length +=
rlp_calculate_length(msg->gas_price.size, msg->gas_price.bytes[0]);
rlp_length +=
rlp_calculate_length(msg->gas_limit.size, msg->gas_limit.bytes[0]);
rlp_length += rlp_calculate_length(params.pubkeyhash_set ? 20 : 0,
params.pubkeyhash[0]);
rlp_length += rlp_calculate_length(params.value_size, params.value_bytes[0]);
rlp_length +=
rlp_calculate_length(data_total, params.data_initial_chunk_bytes[0]);
if (tx_type) {
rlp_length += rlp_calculate_number_length(tx_type);
}
rlp_length += rlp_calculate_number_length(chain_id);
rlp_length += rlp_calculate_length(0, 0);
rlp_length += rlp_calculate_length(0, 0);
/* Stage 2: Store header fields */
hash_rlp_list_length(rlp_length);
layoutProgress(_("Signing"), 100);
if (tx_type) {
hash_rlp_number(tx_type);
}
hash_rlp_field(msg->nonce.bytes, msg->nonce.size);
hash_rlp_field(msg->gas_price.bytes, msg->gas_price.size);
hash_rlp_field(msg->gas_limit.bytes, msg->gas_limit.size);
hash_rlp_field(params.pubkeyhash, params.pubkeyhash_set ? 20 : 0);
hash_rlp_field(params.value_bytes, params.value_size);
hash_rlp_length(data_total, params.data_initial_chunk_bytes[0]);
hash_data(params.data_initial_chunk_bytes, params.data_initial_chunk_size);
data_left = data_total - params.data_initial_chunk_size;
memcpy(privkey, node->private_key, 32);
if (data_left > 0) {
send_request_chunk();
} else {
send_signature();
}
}
void ethereum_signing_init_eip1559(const EthereumSignTxEIP1559 *msg,
const HDNode *node) {
struct signing_params params = {
.chain_id = msg->chain_id,
.data_length = msg->data_length,
.data_initial_chunk_size = msg->data_initial_chunk.size,
.data_initial_chunk_bytes = msg->data_initial_chunk.bytes,
.has_to = msg->has_to,
.to = msg->to,
.value_size = msg->value.size,
.value_bytes = msg->value.bytes,
};
eip1559 = true;
if (!ethereum_signing_init_common(&params)) {
ethereum_signing_abort();
return;
}
// sanity check that fee doesn't overflow
if (msg->max_gas_fee.size + msg->gas_limit.size > 30 ||
msg->max_priority_fee.size + msg->gas_limit.size > 30) {
fsm_sendFailure(FailureType_Failure_DataError, _("Safety check failed"));
ethereum_signing_abort();
return;
}
ethereum_signing_handle_erc20(&params);
if (!ethereum_signing_confirm_common(&params)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
layoutEthereumFeeEIP1559(_("Maximum fee per gas"), msg->max_gas_fee.bytes,
msg->max_gas_fee.size, NULL, 0);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
layoutEthereumFeeEIP1559(_("Priority fee per gas"),
msg->max_priority_fee.bytes,
msg->max_priority_fee.size, NULL, 0);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
layoutEthereumFeeEIP1559(_("Maximum fee"), msg->gas_limit.bytes,
msg->gas_limit.size, msg->max_gas_fee.bytes,
msg->max_gas_fee.size);
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
fsm_sendFailure(FailureType_Failure_ActionCancelled, NULL);
ethereum_signing_abort();
return;
}
/* Stage 1: Calculate total RLP length */
uint32_t rlp_length = 0;
layoutProgress(_("Signing"), 0);
rlp_length += rlp_calculate_number_length(chain_id);
rlp_length += rlp_calculate_length(msg->nonce.size, msg->nonce.bytes[0]);
rlp_length += rlp_calculate_length(msg->max_priority_fee.size,
msg->max_priority_fee.bytes[0]);
rlp_length +=
rlp_calculate_length(msg->max_gas_fee.size, msg->max_gas_fee.bytes[0]);
rlp_length +=
rlp_calculate_length(msg->gas_limit.size, msg->gas_limit.bytes[0]);
rlp_length += rlp_calculate_length(params.pubkeyhash_set ? 20 : 0,
params.pubkeyhash[0]);
rlp_length += rlp_calculate_length(params.value_size, params.value_bytes[0]);
rlp_length +=
rlp_calculate_length(data_total, params.data_initial_chunk_bytes[0]);
rlp_length +=
rlp_calculate_length(rlp_calculate_access_list_length(
msg->access_list, msg->access_list_count),
0xff);
/* Stage 2: Store header fields */
hash_rlp_number(EIP1559_TX_TYPE);
hash_rlp_list_length(rlp_length);
layoutProgress(_("Signing"), 100);
hash_rlp_number(chain_id);
hash_rlp_field(msg->nonce.bytes, msg->nonce.size);
hash_rlp_field(msg->max_priority_fee.bytes, msg->max_priority_fee.size);
hash_rlp_field(msg->max_gas_fee.bytes, msg->max_gas_fee.size);
hash_rlp_field(msg->gas_limit.bytes, msg->gas_limit.size);
hash_rlp_field(params.pubkeyhash, params.pubkeyhash_set ? 20 : 0);
hash_rlp_field(params.value_bytes, params.value_size);
hash_rlp_length(data_total, params.data_initial_chunk_bytes[0]);
hash_data(params.data_initial_chunk_bytes, params.data_initial_chunk_size);
data_left = data_total - params.data_initial_chunk_size;
/* make a copy of access_list, hash it after data is processed */
memcpy(signing_access_list, msg->access_list, sizeof(signing_access_list));
signing_access_list_count = msg->access_list_count;
memcpy(privkey, node->private_key, 32);
if (data_left > 0) {
send_request_chunk();
} else {
send_signature();
}
}
void ethereum_signing_txack(const EthereumTxAck *tx) {
if (!ethereum_signing) {
fsm_sendFailure(FailureType_Failure_UnexpectedMessage,
_("Not in Ethereum signing mode"));
layoutHome();
return;
}
if (tx->data_chunk.size > data_left) {
fsm_sendFailure(FailureType_Failure_DataError, _("Too much data"));
ethereum_signing_abort();
return;
}
if (data_left > 0 && tx->data_chunk.size == 0) {
fsm_sendFailure(FailureType_Failure_DataError,
_("Empty data chunk received"));
ethereum_signing_abort();
return;
}
hash_data(tx->data_chunk.bytes, tx->data_chunk.size);
data_left -= tx->data_chunk.size;
if (data_left > 0) {
send_request_chunk();
} else {
send_signature();
}
}
void ethereum_signing_abort(void) {
if (ethereum_signing) {
memzero(privkey, sizeof(privkey));
layoutHome();
ethereum_signing = false;
}
}
static void ethereum_message_hash(const uint8_t *message, size_t message_len,
uint8_t hash[32]) {
struct SHA3_CTX ctx = {0};
sha3_256_Init(&ctx);
sha3_Update(&ctx, (const uint8_t *)"\x19" "Ethereum Signed Message:\n", 26);
uint8_t c = 0;
if (message_len >= 1000000000) {
c = '0' + message_len / 1000000000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 100000000) {
c = '0' + message_len / 100000000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 10000000) {
c = '0' + message_len / 10000000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 1000000) {
c = '0' + message_len / 1000000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 100000) {
c = '0' + message_len / 100000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 10000) {
c = '0' + message_len / 10000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 1000) {
c = '0' + message_len / 1000 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 100) {
c = '0' + message_len / 100 % 10;
sha3_Update(&ctx, &c, 1);
}
if (message_len >= 10) {
c = '0' + message_len / 10 % 10;
sha3_Update(&ctx, &c, 1);
}
c = '0' + message_len % 10;
sha3_Update(&ctx, &c, 1);
sha3_Update(&ctx, message, message_len);
keccak_Final(&ctx, hash);
}
void ethereum_message_sign(const EthereumSignMessage *msg, const HDNode *node,
EthereumMessageSignature *resp) {
uint8_t hash[32] = {0};
ethereum_message_hash(msg->message.bytes, msg->message.size, hash);
uint8_t v = 0;
if (ecdsa_sign_digest(&secp256k1, node->private_key, hash,
resp->signature.bytes, &v, ethereum_is_canonic) != 0) {
fsm_sendFailure(FailureType_Failure_ProcessError, _("Signing failed"));
return;
}
resp->signature.bytes[64] = 27 + v;
resp->signature.size = 65;
msg_write(MessageType_MessageType_EthereumMessageSignature, resp);
}
int ethereum_message_verify(const EthereumVerifyMessage *msg) {
if (msg->signature.size != 65) {
fsm_sendFailure(FailureType_Failure_DataError, _("Malformed signature"));
return 1;
}
uint8_t pubkeyhash[20] = {0};
if (!ethereum_parse(msg->address, pubkeyhash)) {
fsm_sendFailure(FailureType_Failure_DataError, _("Malformed address"));
return 1;
}
uint8_t pubkey[65] = {0};
uint8_t hash[32] = {0};
ethereum_message_hash(msg->message.bytes, msg->message.size, hash);
/* v should be 27, 28 but some implementations use 0,1. We are
* compatible with both.
*/
uint8_t v = msg->signature.bytes[64];
if (v >= 27) {
v -= 27;
}
if (v >= 2) {
return 2;
}
int ret = 0;
#ifdef USE_SECP256K1_ZKP_ECDSA
ret = zkp_ecdsa_recover_pub_from_sig(&secp256k1, pubkey, msg->signature.bytes,
hash, v);
#else
ret = ecdsa_recover_pub_from_sig(&secp256k1, pubkey, msg->signature.bytes,
hash, v);
#endif
if (ret != 0) {
return 2;
}
struct SHA3_CTX ctx = {0};
sha3_256_Init(&ctx);
sha3_Update(&ctx, pubkey + 1, 64);
keccak_Final(&ctx, hash);
/* result are the least significant 160 bits */
if (memcmp(pubkeyhash, hash + 12, 20) != 0) {
return 2;
}
return 0;
}
/*
* EIP-712 hashes might have no message_hash if primaryType="EIP712Domain".
* In this case, set has_message_hash=false.
*/
static void ethereum_typed_hash(const uint8_t domain_separator_hash[32],
const uint8_t message_hash[32],
bool has_message_hash, uint8_t hash[32]) {
struct SHA3_CTX ctx = {0};
sha3_256_Init(&ctx);
sha3_Update(&ctx, (const uint8_t *)"\x19\x01", 2);
sha3_Update(&ctx, domain_separator_hash, 32);
if (has_message_hash) {
sha3_Update(&ctx, message_hash, 32);
}
keccak_Final(&ctx, hash);
}
void ethereum_typed_hash_sign(const EthereumSignTypedHash *msg,
const HDNode *node,
EthereumTypedDataSignature *resp) {
uint8_t hash[32] = {0};
ethereum_typed_hash(msg->domain_separator_hash.bytes, msg->message_hash.bytes,
msg->has_message_hash, hash);
uint8_t v = 0;
if (ecdsa_sign_digest(&secp256k1, node->private_key, hash,
resp->signature.bytes, &v, ethereum_is_canonic) != 0) {
fsm_sendFailure(FailureType_Failure_ProcessError, _("Signing failed"));
return;
}
resp->signature.bytes[64] = 27 + v;
resp->signature.size = 65;
msg_write(MessageType_MessageType_EthereumTypedDataSignature, resp);
}
bool ethereum_parse(const char *address, uint8_t pubkeyhash[20]) {
memzero(pubkeyhash, 20);
size_t len = strlen(address);
if (len == 40) {
// do nothing
} else if (len == 42) {
// check for "0x" prefix and strip it when required
if (address[0] != '0') return false;
if (address[1] != 'x' && address[1] != 'X') return false;
address += 2;
len -= 2;
} else {
return false;
}
for (size_t i = 0; i < len; i++) {
if (address[i] >= '0' && address[i] <= '9') {
pubkeyhash[i / 2] |= (address[i] - '0') << ((1 - (i % 2)) * 4);
} else if (address[i] >= 'a' && address[i] <= 'f') {
pubkeyhash[i / 2] |= ((address[i] - 'a') + 10) << ((1 - (i % 2)) * 4);
} else if (address[i] >= 'A' && address[i] <= 'F') {
pubkeyhash[i / 2] |= ((address[i] - 'A') + 10) << ((1 - (i % 2)) * 4);
} else {
return false;
}
}
return true;
}
bool ethereum_path_check(uint32_t address_n_count, const uint32_t *address_n,
bool pubkey_export, uint64_t chain) {
bool valid = (address_n_count >= 3);
valid = valid && (address_n[0] == (PATH_HARDENED | 44));
valid = valid && (address_n[1] & PATH_HARDENED);
valid = valid && (address_n[2] & PATH_HARDENED);
valid = valid && ((address_n[2] & PATH_UNHARDEN_MASK) <= PATH_MAX_ACCOUNT);
uint32_t path_slip44 = address_n[1] & PATH_UNHARDEN_MASK;
if (chain == CHAIN_ID_UNKNOWN) {
valid = valid && (is_ethereum_slip44(path_slip44));
} else {
uint32_t chain_slip44 = ethereum_slip44_by_chain_id(chain);
if (chain_slip44 == SLIP44_UNKNOWN) {
// Allow Ethereum or testnet paths for unknown networks.
valid = valid && (path_slip44 == 60 || path_slip44 == 1);
} else if (chain_slip44 != 60 && chain_slip44 != 1) {
// Allow cross-signing with Ethereum unless it's testnet.
valid = valid && (path_slip44 == chain_slip44 || path_slip44 == 60);
} else {
valid = valid && (path_slip44 == chain_slip44);
}
}
if (pubkey_export) {
// m/44'/coin_type'/account'/*
return valid;
}
if (address_n_count == 3) {
// SEP-0005 for non-UTXO-based currencies, defined by Stellar:
// https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0005.md
// m/44'/coin_type'/account'
return valid;
}
// We believe Ethereum should use the SEP-0005 scheme for everything, because
// it is account-based, rather than UTXO-based. Unfortunately, a lot of
// Ethereum tools (MEW, Metamask) do not use such scheme and set account = 0
// and then iterate the address index. For compatibility, we allow this scheme
// as well.
// m/44'/coin_type'/account'/change/address_index
valid = valid && (address_n_count == 5);
valid = valid && (address_n[3] <= PATH_MAX_CHANGE);
valid = valid && (address_n[4] <= PATH_MAX_ADDRESS_INDEX);
return valid;
}
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