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527 lines
17 KiB
527 lines
17 KiB
/*
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* This file is part of the TREZOR project.
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "signing.h"
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#include "fsm.h"
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#include "layout2.h"
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#include "messages.h"
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#include "transaction.h"
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#include "ecdsa.h"
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#include "protect.h"
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#include "crypto.h"
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static uint32_t inputs_count;
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static uint32_t outputs_count;
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static const CoinType *coin;
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static const HDNode *root;
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static HDNode node;
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static bool signing = false;
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enum {
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STAGE_REQUEST_1_INPUT,
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STAGE_REQUEST_2_PREV_META,
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STAGE_REQUEST_2_PREV_INPUT,
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STAGE_REQUEST_2_PREV_OUTPUT,
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STAGE_REQUEST_3_INPUT,
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STAGE_REQUEST_3_OUTPUT,
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STAGE_REQUEST_4_OUTPUT
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} signing_stage;
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static uint32_t idx1i, idx2i, idx2o, idx3i, idx3o, idx4o;
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static TxRequest resp;
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static TxInputType input;
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static TxOutputBinType bin_output;
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static TxStruct to, tp, ti, tc;
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static uint8_t hash[32], hash_check[32], privkey[32], pubkey[33], sig[64];
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static uint64_t to_spend, spending, change_spend;
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const uint32_t version = 1;
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const uint32_t lock_time = 0;
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static uint32_t progress, progress_total;
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static bool multisig_fp_set, multisig_fp_mismatch;
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static uint8_t multisig_fp[32];
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/*
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Workflow of streamed signing
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I - input
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O - output
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foreach I:
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Request I STAGE_REQUEST_1_INPUT
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Calculate amount of I:
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Request prevhash I, META STAGE_REQUEST_2_PREV_META
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foreach prevhash I: STAGE_REQUEST_2_PREV_INPUT
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Request prevhash I
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foreach prevhash O: STAGE_REQUEST_2_PREV_OUTPUT
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Request prevhash O
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Store amount of I
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Calculate hash of streamed tx, compare to prevhash I
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foreach I: STAGE_REQUEST_3_INPUT
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Request I
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If I == I-to-be-signed:
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Fill scriptsig
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Add I to StreamTransactionSign
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foreach O:
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Request O STAGE_REQUEST_3_OUTPUT
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If I=0:
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Display output
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Ask for confirmation
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Add O to StreamTransactionSign
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If I=0:
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Check tx fee
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Calculate txhash
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else:
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Compare current hash with txhash
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If different:
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Failure
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Sign StreamTransactionSign
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Return signed chunk
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*/
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void send_req_1_input(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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idx2i = idx2o = idx3i = idx3o = 0;
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signing_stage = STAGE_REQUEST_1_INPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXINPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx1i;
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_2_prev_meta(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_2_PREV_META;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXMETA;
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resp.has_details = true;
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resp.details.has_tx_hash = true;
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resp.details.tx_hash.size = input.prev_hash.size;
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memcpy(resp.details.tx_hash.bytes, input.prev_hash.bytes, input.prev_hash.size);
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_2_prev_input(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_2_PREV_INPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXINPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx2i;
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resp.details.has_tx_hash = true;
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resp.details.tx_hash.size = input.prev_hash.size;
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memcpy(resp.details.tx_hash.bytes, input.prev_hash.bytes, resp.details.tx_hash.size);
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_2_prev_output(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_2_PREV_OUTPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXOUTPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx2o;
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resp.details.has_tx_hash = true;
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resp.details.tx_hash.size = input.prev_hash.size;
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memcpy(resp.details.tx_hash.bytes, input.prev_hash.bytes, resp.details.tx_hash.size);
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_3_input(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_3_INPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXINPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx3i;
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_3_output(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_3_OUTPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXOUTPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx3o;
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_4_output(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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signing_stage = STAGE_REQUEST_4_OUTPUT;
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resp.has_request_type = true;
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resp.request_type = RequestType_TXOUTPUT;
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resp.has_details = true;
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resp.details.has_request_index = true;
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resp.details.request_index = idx4o;
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void send_req_finished(void)
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{
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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resp.has_request_type = true;
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resp.request_type = RequestType_TXFINISHED;
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msg_write(MessageType_MessageType_TxRequest, &resp);
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}
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void signing_init(uint32_t _inputs_count, uint32_t _outputs_count, const CoinType *_coin, HDNode *_root)
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{
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inputs_count = _inputs_count;
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outputs_count = _outputs_count;
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coin = _coin;
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root = _root;
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idx1i = idx2i = idx2o = idx3i = idx3o = idx4o = 0;
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to_spend = 0;
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spending = 0;
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change_spend = 0;
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memset(&input, 0, sizeof(TxInputType));
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memset(&resp, 0, sizeof(TxRequest));
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signing = true;
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progress = 1;
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progress_total = inputs_count * (1 + inputs_count + outputs_count) + outputs_count + 1;
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multisig_fp_set = false;
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multisig_fp_mismatch = false;
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tx_init(&to, inputs_count, outputs_count, version, lock_time, false);
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layoutProgressSwipe("Signing transaction", 0);
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send_req_1_input();
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}
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void signing_txack(TransactionType *tx)
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{
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if (!signing) {
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fsm_sendFailure(FailureType_Failure_UnexpectedMessage, "Not in Signing mode");
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layoutHome();
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return;
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}
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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int co;
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memset(&resp, 0, sizeof(TxRequest));
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switch (signing_stage) {
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case STAGE_REQUEST_1_INPUT:
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progress++;
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memcpy(&input, tx->inputs, sizeof(TxInputType));
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send_req_2_prev_meta();
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return;
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case STAGE_REQUEST_2_PREV_META:
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tx_init(&tp, tx->inputs_cnt, tx->outputs_cnt, tx->version, tx->lock_time, false);
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send_req_2_prev_input();
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return;
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case STAGE_REQUEST_2_PREV_INPUT:
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if (!tx_serialize_input_hash(&tp, tx->inputs)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize input");
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signing_abort();
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return;
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}
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if (idx2i < tp.inputs_len - 1) {
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idx2i++;
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send_req_2_prev_input();
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} else {
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send_req_2_prev_output();
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}
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return;
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case STAGE_REQUEST_2_PREV_OUTPUT:
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if (!tx_serialize_output_hash(&tp, tx->bin_outputs)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
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signing_abort();
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return;
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}
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if (idx2o == input.prev_index) {
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to_spend += tx->bin_outputs[0].amount;
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}
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if (idx2o < tp.outputs_len - 1) {
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idx2o++;
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send_req_2_prev_output();
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} else {
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tx_hash_final(&tp, hash, true);
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if (memcmp(hash, input.prev_hash.bytes, 32) != 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Encountered invalid prevhash");
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signing_abort();
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return;
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}
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tx_init(&ti, inputs_count, outputs_count, version, lock_time, true);
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tx_init(&tc, inputs_count, outputs_count, version, lock_time, true);
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memset(privkey, 0, 32);
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memset(pubkey, 0, 33);
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send_req_3_input();
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}
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return;
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case STAGE_REQUEST_3_INPUT:
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progress++;
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if (!tx_serialize_input_hash(&tc, tx->inputs)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize input");
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signing_abort();
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return;
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}
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if (idx1i == 0) {
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if (tx->inputs[0].script_type == InputScriptType_SPENDMULTISIG &&
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tx->inputs[0].has_multisig && !multisig_fp_mismatch) {
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if (multisig_fp_set) {
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uint8_t h[32];
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if (cryptoMultisigFingerprint(&(tx->inputs[0].multisig), h) == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Error computing multisig fingeprint");
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signing_abort();
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return;
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}
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if (memcmp(multisig_fp, h, 32) != 0) {
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multisig_fp_mismatch = true;
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}
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} else {
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if (cryptoMultisigFingerprint(&(tx->inputs[0].multisig), multisig_fp) == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Error computing multisig fingeprint");
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signing_abort();
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return;
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}
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multisig_fp_set = true;
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}
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}
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}
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if (idx3i == idx1i) {
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memcpy(&node, root, sizeof(HDNode));
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uint32_t k;
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for (k = 0; k < tx->inputs[0].address_n_count; k++) {
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if (hdnode_private_ckd(&node, tx->inputs[0].address_n[k]) == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to derive private key");
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signing_abort();
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return;
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}
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}
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if (tx->inputs[0].script_type == InputScriptType_SPENDMULTISIG) {
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if (!tx->inputs[0].has_multisig) {
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fsm_sendFailure(FailureType_Failure_Other, "Multisig info not provided");
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signing_abort();
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return;
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}
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tx->inputs[0].script_sig.size = compile_script_multisig(&(tx->inputs[0].multisig), tx->inputs[0].script_sig.bytes);
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} else { // SPENDADDRESS
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ecdsa_get_pubkeyhash(node.public_key, hash);
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tx->inputs[0].script_sig.size = compile_script_sig(coin->address_type, hash, tx->inputs[0].script_sig.bytes);
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}
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if (tx->inputs[0].script_sig.size == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to compile input");
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signing_abort();
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return;
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}
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memcpy(privkey, node.private_key, 32);
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memcpy(pubkey, node.public_key, 33);
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} else {
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tx->inputs[0].script_sig.size = 0;
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}
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if (!tx_serialize_input_hash(&ti, tx->inputs)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize input");
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signing_abort();
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return;
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}
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if (idx3i < inputs_count - 1) {
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idx3i++;
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send_req_3_input();
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} else {
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send_req_3_output();
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}
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return;
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case STAGE_REQUEST_3_OUTPUT:
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progress++;
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if (idx1i == 0) {
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bool is_change = false;
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if (tx->outputs[0].script_type == OutputScriptType_PAYTOMULTISIG &&
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tx->outputs[0].has_multisig &&
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multisig_fp_set && !multisig_fp_mismatch) {
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uint8_t h[32];
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if (cryptoMultisigFingerprint(&(tx->outputs[0].multisig), h) == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Error computing multisig fingeprint");
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signing_abort();
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return;
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}
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if (memcmp(multisig_fp, h, 32) == 0) {
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is_change = true;
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}
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} else
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if (tx->outputs[0].script_type == OutputScriptType_PAYTOADDRESS &&
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tx->outputs[0].address_n_count > 0) {
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is_change = true;
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}
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if (is_change) {
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if (change_spend == 0) { // not set
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change_spend = tx->outputs[0].amount;
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} else {
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fsm_sendFailure(FailureType_Failure_Other, "Only one change output allowed");
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signing_abort();
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return;
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}
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}
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spending += tx->outputs[0].amount;
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co = compile_output(coin, root, tx->outputs, &bin_output, !is_change);
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if (!is_change) {
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layoutProgress("Signing transaction", 1000 * progress / progress_total);
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}
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} else {
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co = compile_output(coin, root, tx->outputs, &bin_output, false);
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}
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if (co < 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Signing cancelled by user");
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signing_abort();
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return;
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} else if (co == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to compile output");
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signing_abort();
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return;
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}
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if (!tx_serialize_output_hash(&tc, &bin_output)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
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signing_abort();
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return;
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}
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if (!tx_serialize_output_hash(&ti, &bin_output)) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize output");
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signing_abort();
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return;
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}
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if (idx3o < outputs_count - 1) {
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idx3o++;
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send_req_3_output();
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} else {
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if (idx1i == 0) {
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tx_hash_final(&tc, hash_check, false);
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} else {
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tx_hash_final(&tc, hash, false);
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if (memcmp(hash, hash_check, 32) != 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Transaction has changed during signing");
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signing_abort();
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return;
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}
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}
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tx_hash_final(&ti, hash, false);
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resp.has_serialized = true;
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resp.serialized.has_signature_index = true;
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resp.serialized.signature_index = idx1i;
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resp.serialized.has_signature = true;
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resp.serialized.has_serialized_tx = true;
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ecdsa_sign_digest(privkey, hash, sig, 0);
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resp.serialized.signature.size = ecdsa_sig_to_der(sig, resp.serialized.signature.bytes);
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if (input.script_type == InputScriptType_SPENDMULTISIG) {
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if (!input.has_multisig) {
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fsm_sendFailure(FailureType_Failure_Other, "Multisig info not provided");
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signing_abort();
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return;
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}
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// fill in the signature
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int pubkey_idx = cryptoMultisigPubkeyIndex(&(input.multisig), pubkey);
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if (pubkey_idx < 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Pubkey not found in multisig script");
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signing_abort();
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return;
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}
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memcpy(input.multisig.signatures[pubkey_idx].bytes, resp.serialized.signature.bytes, resp.serialized.signature.size);
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input.multisig.signatures[pubkey_idx].size = resp.serialized.signature.size;
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input.script_sig.size = serialize_script_multisig(&(input.multisig), input.script_sig.bytes);
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if (input.script_sig.size == 0) {
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fsm_sendFailure(FailureType_Failure_Other, "Failed to serialize multisig script");
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signing_abort();
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return;
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}
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} else { // SPENDADDRESS
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input.script_sig.size = serialize_script_sig(resp.serialized.signature.bytes, resp.serialized.signature.size, pubkey, 33, input.script_sig.bytes);
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}
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resp.serialized.serialized_tx.size = tx_serialize_input(&to, &input, resp.serialized.serialized_tx.bytes);
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if (idx1i < inputs_count - 1) {
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idx1i++;
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send_req_1_input();
|
|
} else {
|
|
if (spending > to_spend) {
|
|
fsm_sendFailure(FailureType_Failure_NotEnoughFunds, "Not enough funds");
|
|
layoutHome();
|
|
return;
|
|
}
|
|
uint64_t fee = to_spend - spending;
|
|
uint32_t tx_est_size = transactionEstimateSizeKb(inputs_count, outputs_count);
|
|
if (fee > (uint64_t)tx_est_size * coin->maxfee_kb) {
|
|
layoutFeeOverThreshold(coin, fee, tx_est_size);
|
|
if (!protectButton(ButtonRequestType_ButtonRequest_FeeOverThreshold, false)) {
|
|
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Fee over threshold. Signing cancelled.");
|
|
layoutHome();
|
|
return;
|
|
}
|
|
}
|
|
// last confirmation
|
|
layoutConfirmTx(coin, to_spend - change_spend - fee, fee);
|
|
if (!protectButton(ButtonRequestType_ButtonRequest_SignTx, false)) {
|
|
fsm_sendFailure(FailureType_Failure_ActionCancelled, "Signing cancelled by user");
|
|
signing_abort();
|
|
return;
|
|
}
|
|
send_req_4_output();
|
|
}
|
|
}
|
|
return;
|
|
case STAGE_REQUEST_4_OUTPUT:
|
|
progress++;
|
|
if (compile_output(coin, root, tx->outputs, &bin_output, false) <= 0) {
|
|
fsm_sendFailure(FailureType_Failure_Other, "Failed to compile output");
|
|
signing_abort();
|
|
return;
|
|
}
|
|
resp.has_serialized = true;
|
|
resp.serialized.has_serialized_tx = true;
|
|
resp.serialized.serialized_tx.size = tx_serialize_output(&to, &bin_output, resp.serialized.serialized_tx.bytes);
|
|
if (idx4o < outputs_count - 1) {
|
|
idx4o++;
|
|
send_req_4_output();
|
|
} else {
|
|
send_req_finished();
|
|
signing_abort();
|
|
}
|
|
return;
|
|
}
|
|
|
|
fsm_sendFailure(FailureType_Failure_Other, "Signing error");
|
|
signing_abort();
|
|
}
|
|
|
|
void signing_abort(void)
|
|
{
|
|
if (signing) {
|
|
layoutHome();
|
|
signing = false;
|
|
}
|
|
}
|