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Diffstat (limited to 'src/wallet/message_store.cpp')
| -rw-r--r-- | src/wallet/message_store.cpp | 1445 |
1 files changed, 1445 insertions, 0 deletions
diff --git a/src/wallet/message_store.cpp b/src/wallet/message_store.cpp new file mode 100644 index 000000000..ce6f4f52b --- /dev/null +++ b/src/wallet/message_store.cpp @@ -0,0 +1,1445 @@ +// Copyright (c) 2018, The Monero Project +// +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without modification, are +// permitted provided that the following conditions are met: +// +// 1. Redistributions of source code must retain the above copyright notice, this list of +// conditions and the following disclaimer. +// +// 2. Redistributions in binary form must reproduce the above copyright notice, this list +// of conditions and the following disclaimer in the documentation and/or other +// materials provided with the distribution. +// +// 3. Neither the name of the copyright holder nor the names of its contributors may be +// used to endorse or promote products derived from this software without specific +// prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY +// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL +// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF +// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "message_store.h" +#include <boost/archive/portable_binary_oarchive.hpp> +#include <boost/archive/portable_binary_iarchive.hpp> +#include <boost/format.hpp> +#include <boost/algorithm/string.hpp> +#include <fstream> +#include <sstream> +#include "file_io_utils.h" +#include "storages/http_abstract_invoke.h" +#include "wallet_errors.h" +#include "serialization/binary_utils.h" +#include "common/base58.h" +#include "common/util.h" +#include "string_tools.h" + + +#undef MONERO_DEFAULT_LOG_CATEGORY +#define MONERO_DEFAULT_LOG_CATEGORY "wallet.mms" + +namespace mms +{ + +message_store::message_store() +{ + m_active = false; + m_auto_send = false; + m_next_message_id = 1; + m_num_authorized_signers = 0; + m_num_required_signers = 0; + m_nettype = cryptonote::network_type::UNDEFINED; + m_run = true; +} + +namespace +{ + // MMS options handling mirrors what "wallet2" is doing for its options, on-demand init and all + // It's not very clean to initialize Bitmessage-specific options here, but going one level further + // down still into "message_transporter" for that is a little bit too much + struct options + { + const command_line::arg_descriptor<std::string> bitmessage_address = {"bitmessage-address", mms::message_store::tr("Use PyBitmessage instance at URL <arg>"), "http://localhost:8442/"}; + const command_line::arg_descriptor<std::string> bitmessage_login = {"bitmessage-login", mms::message_store::tr("Specify <arg> as username:password for PyBitmessage API"), "username:password"}; + }; +} + +void message_store::init_options(boost::program_options::options_description& desc_params) +{ + const options opts{}; + command_line::add_arg(desc_params, opts.bitmessage_address); + command_line::add_arg(desc_params, opts.bitmessage_login); +} + +void message_store::init(const multisig_wallet_state &state, const std::string &own_label, + const std::string &own_transport_address, uint32_t num_authorized_signers, uint32_t num_required_signers) +{ + m_num_authorized_signers = num_authorized_signers; + m_num_required_signers = num_required_signers; + m_signers.clear(); + m_messages.clear(); + m_next_message_id = 1; + + // The vector "m_signers" gets here once the required number of elements, one for each authorized signer, + // and is never changed again. The rest of the code relies on "size(m_signers) == m_num_authorized_signers" + // without further checks. + authorized_signer signer; + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + signer.me = signer.index == 0; // Strict convention: The very first signer is fixed as / must be "me" + m_signers.push_back(signer); + signer.index++; + } + + set_signer(state, 0, own_label, own_transport_address, state.address); + + m_nettype = state.nettype; + set_active(true); + m_filename = state.mms_file; + save(state); +} + +void message_store::set_options(const boost::program_options::variables_map& vm) +{ + const options opts{}; + std::string bitmessage_address = command_line::get_arg(vm, opts.bitmessage_address); + epee::wipeable_string bitmessage_login = command_line::get_arg(vm, opts.bitmessage_login); + set_options(bitmessage_address, bitmessage_login); +} + +void message_store::set_options(const std::string &bitmessage_address, const epee::wipeable_string &bitmessage_login) +{ + m_transporter.set_options(bitmessage_address, bitmessage_login); +} + +void message_store::set_signer(const multisig_wallet_state &state, + uint32_t index, + const boost::optional<std::string> &label, + const boost::optional<std::string> &transport_address, + const boost::optional<cryptonote::account_public_address> monero_address) +{ + THROW_WALLET_EXCEPTION_IF(index >= m_num_authorized_signers, tools::error::wallet_internal_error, "Invalid signer index " + index); + authorized_signer &m = m_signers[index]; + if (label) + { + m.label = label.get(); + } + if (transport_address) + { + m.transport_address = transport_address.get(); + } + if (monero_address) + { + m.monero_address_known = true; + m.monero_address = monero_address.get(); + } + // Save to minimize the chance to loose that info (at least while in beta) + save(state); +} + +const authorized_signer &message_store::get_signer(uint32_t index) const +{ + THROW_WALLET_EXCEPTION_IF(index >= m_num_authorized_signers, tools::error::wallet_internal_error, "Invalid signer index " + index); + return m_signers[index]; +} + +bool message_store::signer_config_complete() const +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.label.empty() || m.transport_address.empty() || !m.monero_address_known) + { + return false; + } + } + return true; +} + +// Check if all signers have a label set (as it's a requirement for starting auto-config +// by the "manager") +bool message_store::signer_labels_complete() const +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.label.empty()) + { + return false; + } + } + return true; +} + +void message_store::get_signer_config(std::string &signer_config) +{ + std::stringstream oss; + boost::archive::portable_binary_oarchive ar(oss); + ar << m_signers; + signer_config = oss.str(); +} + +void message_store::unpack_signer_config(const multisig_wallet_state &state, const std::string &signer_config, + std::vector<authorized_signer> &signers) +{ + try + { + std::stringstream iss; + iss << signer_config; + boost::archive::portable_binary_iarchive ar(iss); + ar >> signers; + } + catch (...) + { + THROW_WALLET_EXCEPTION_IF(true, tools::error::wallet_internal_error, "Invalid structure of signer config"); + } + uint32_t num_signers = (uint32_t)signers.size(); + THROW_WALLET_EXCEPTION_IF(num_signers != m_num_authorized_signers, tools::error::wallet_internal_error, "Wrong number of signers in config: " + num_signers); +} + +void message_store::process_signer_config(const multisig_wallet_state &state, const std::string &signer_config) +{ + // The signers in "signer_config" and the resident wallet signers are matched not by label, but + // by Monero address, and ALL labels will be set from "signer_config", even the "me" label. + // In the auto-config process as implemented now the auto-config manager is responsible for defining + // the labels, and right at the end of the process ALL wallets use the SAME labels. The idea behind this + // is preventing problems like duplicate labels and confusion (Bob choosing a label "IamAliceHonest"). + // (Of course signers are free to re-define any labels they don't like AFTER auto-config.) + // + // Usually this method will be called with only the "me" signer defined in the wallet, and may + // produce unexpected behaviour if that wallet contains additional signers that have nothing to do with + // those arriving in "signer_config". + std::vector<authorized_signer> signers; + unpack_signer_config(state, signer_config, signers); + + uint32_t new_index = 1; + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = signers[i]; + uint32_t index; + uint32_t take_index; + bool found = get_signer_index_by_monero_address(m.monero_address, index); + if (found) + { + // Redefine existing (probably "me", under usual circumstances) + take_index = index; + } + else + { + // Add new; neglect that we may erroneously overwrite already defined signers + // (but protect "me") + take_index = new_index; + if ((new_index + 1) < m_num_authorized_signers) + { + new_index++; + } + } + authorized_signer &modify = m_signers[take_index]; + modify.label = m.label; // ALWAYS set label, see comments above + if (!modify.me) + { + modify.transport_address = m.transport_address; + modify.monero_address_known = m.monero_address_known; + if (m.monero_address_known) + { + modify.monero_address = m.monero_address; + } + } + } + save(state); +} + +void message_store::start_auto_config(const multisig_wallet_state &state) +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + authorized_signer &m = m_signers[i]; + if (!m.me) + { + setup_signer_for_auto_config(i, create_auto_config_token(), true); + } + m.auto_config_running = true; + } + save(state); +} + +// Check auto-config token string and convert to standardized form; +// Try to make it as foolproof as possible, with built-in tolerance to make up for +// errors in transmission that still leave the token recognizable. +bool message_store::check_auto_config_token(const std::string &raw_token, + std::string &adjusted_token) const +{ + std::string prefix(AUTO_CONFIG_TOKEN_PREFIX); + uint32_t num_hex_digits = (AUTO_CONFIG_TOKEN_BYTES + 1) * 2; + uint32_t full_length = num_hex_digits + prefix.length(); + uint32_t raw_length = raw_token.length(); + std::string hex_digits; + + if (raw_length == full_length) + { + // Prefix must be there; accept it in any casing + std::string raw_prefix(raw_token.substr(0, 3)); + boost::algorithm::to_lower(raw_prefix); + if (raw_prefix != prefix) + { + return false; + } + hex_digits = raw_token.substr(3); + } + else if (raw_length == num_hex_digits) + { + // Accept the token without the prefix if it's otherwise ok + hex_digits = raw_token; + } + else + { + return false; + } + + // Convert to strict lowercase and correct any common misspellings + boost::algorithm::to_lower(hex_digits); + std::replace(hex_digits.begin(), hex_digits.end(), 'o', '0'); + std::replace(hex_digits.begin(), hex_digits.end(), 'i', '1'); + std::replace(hex_digits.begin(), hex_digits.end(), 'l', '1'); + + // Now it must be correct hex with correct checksum, no further tolerance possible + std::string token_bytes; + if (!epee::string_tools::parse_hexstr_to_binbuff(hex_digits, token_bytes)) + { + return false; + } + const crypto::hash &hash = crypto::cn_fast_hash(token_bytes.data(), token_bytes.size() - 1); + if (token_bytes[AUTO_CONFIG_TOKEN_BYTES] != hash.data[0]) + { + return false; + } + adjusted_token = prefix + hex_digits; + return true; +} + +// Create a new auto-config token with prefix, random 8-hex digits plus 2 checksum digits +std::string message_store::create_auto_config_token() +{ + unsigned char random[AUTO_CONFIG_TOKEN_BYTES]; + crypto::rand(AUTO_CONFIG_TOKEN_BYTES, random); + std::string token_bytes; + token_bytes.append((char *)random, AUTO_CONFIG_TOKEN_BYTES); + + // Add a checksum because technically ANY four bytes are a valid token, and without a checksum we would send + // auto-config messages "to nowhere" after the slightest typo without knowing it + const crypto::hash &hash = crypto::cn_fast_hash(token_bytes.data(), token_bytes.size()); + token_bytes += hash.data[0]; + std::string prefix(AUTO_CONFIG_TOKEN_PREFIX); + return prefix + epee::string_tools::buff_to_hex_nodelimer(token_bytes); +} + +// Add a message for sending "me" address data to the auto-config transport address +// that can be derived from the token and activate auto-config +size_t message_store::add_auto_config_data_message(const multisig_wallet_state &state, + const std::string &auto_config_token) +{ + authorized_signer &me = m_signers[0]; + me.auto_config_token = auto_config_token; + setup_signer_for_auto_config(0, auto_config_token, false); + me.auto_config_running = true; + + auto_config_data data; + data.label = me.label; + data.transport_address = me.transport_address; + data.monero_address = me.monero_address; + + std::stringstream oss; + boost::archive::portable_binary_oarchive ar(oss); + ar << data; + + return add_message(state, 0, message_type::auto_config_data, message_direction::out, oss.str()); +} + +// Process a single message with auto-config data, destined for "message.signer_index" +void message_store::process_auto_config_data_message(uint32_t id) +{ + // "auto_config_data" contains the label that the auto-config data sender uses for "me", but that's + // more for completeness' sake, and right now it's not used. In general, the auto-config manager + // decides/defines the labels, and right after completing auto-config ALL wallets use the SAME labels. + + const message &m = get_message_ref_by_id(id); + + auto_config_data data; + try + { + std::stringstream iss; + iss << m.content; + boost::archive::portable_binary_iarchive ar(iss); + ar >> data; + } + catch (...) + { + THROW_WALLET_EXCEPTION_IF(true, tools::error::wallet_internal_error, "Invalid structure of auto config data"); + } + + authorized_signer &signer = m_signers[m.signer_index]; + // "signer.label" does NOT change, see comment above + signer.transport_address = data.transport_address; + signer.monero_address_known = true; + signer.monero_address = data.monero_address; + signer.auto_config_running = false; +} + +void message_store::stop_auto_config() +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + authorized_signer &m = m_signers[i]; + if (!m.me && !m.auto_config_transport_address.empty()) + { + // Try to delete those "unused API" addresses in PyBitmessage, especially since + // it seems it's not possible to delete them interactively, only to "disable" them + m_transporter.delete_transport_address(m.auto_config_transport_address); + } + m.auto_config_token.clear(); + m.auto_config_public_key = crypto::null_pkey; + m.auto_config_secret_key = crypto::null_skey; + m.auto_config_transport_address.clear(); + m.auto_config_running = false; + } +} + +void message_store::setup_signer_for_auto_config(uint32_t index, const std::string token, bool receiving) +{ + // It may be a little strange to hash the textual hex digits of the auto config token into + // 32 bytes and turn that into a Monero public/secret key pair, instead of doing something + // much less complicated like directly using the underlying random 40 bits as key for a + // symmetric cipher, but everything is there already for encrypting and decrypting messages + // with such key pairs, and furthermore it would be trivial to use tokens with a different + // number of bytes. + // + // In the wallet of the auto-config manager each signer except "me" gets set its own + // auto-config parameters. In the wallet of somebody using the token to send auto-config + // data the auto-config parameters are stored in the "me" signer and taken from there + // to send that data. + THROW_WALLET_EXCEPTION_IF(index >= m_num_authorized_signers, tools::error::wallet_internal_error, "Invalid signer index " + index); + authorized_signer &m = m_signers[index]; + m.auto_config_token = token; + crypto::hash_to_scalar(token.data(), token.size(), m.auto_config_secret_key); + crypto::secret_key_to_public_key(m.auto_config_secret_key, m.auto_config_public_key); + if (receiving) + { + m.auto_config_transport_address = m_transporter.derive_and_receive_transport_address(m.auto_config_token); + } + else + { + m.auto_config_transport_address = m_transporter.derive_transport_address(m.auto_config_token); + } +} + +bool message_store::get_signer_index_by_monero_address(const cryptonote::account_public_address &monero_address, uint32_t &index) const +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.monero_address == monero_address) + { + index = m.index; + return true; + } + } + MWARNING("No authorized signer with Monero address " << account_address_to_string(monero_address)); + return false; +} + +bool message_store::get_signer_index_by_label(const std::string label, uint32_t &index) const +{ + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.label == label) + { + index = m.index; + return true; + } + } + MWARNING("No authorized signer with label " << label); + return false; +} + +void message_store::process_wallet_created_data(const multisig_wallet_state &state, message_type type, const std::string &content) +{ + switch(type) + { + case message_type::key_set: + // Result of a "prepare_multisig" command in the wallet + // Send the key set to all other signers + case message_type::additional_key_set: + // Result of a "make_multisig" command or a "exchange_multisig_keys" in the wallet in case of M/N multisig + // Send the additional key set to all other signers + case message_type::multisig_sync_data: + // Result of a "export_multisig_info" command in the wallet + // Send the sync data to all other signers + for (uint32_t i = 1; i < m_num_authorized_signers; ++i) + { + add_message(state, i, type, message_direction::out, content); + } + break; + + case message_type::partially_signed_tx: + // Result of a "transfer" command in the wallet, or a "sign_multisig" command + // that did not yet result in the minimum number of signatures required + // Create a message "from me to me" as a container for the tx data + if (m_num_required_signers == 1) + { + // Probably rare, but possible: The 1 signature is already enough, correct the type + // Easier to correct here than asking all callers to detect this rare special case + type = message_type::fully_signed_tx; + } + add_message(state, 0, type, message_direction::in, content); + break; + + case message_type::fully_signed_tx: + add_message(state, 0, type, message_direction::in, content); + break; + + default: + THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Illegal message type " + (uint32_t)type); + break; + } +} + +size_t message_store::add_message(const multisig_wallet_state &state, + uint32_t signer_index, message_type type, message_direction direction, + const std::string &content) +{ + message m; + m.id = m_next_message_id++; + m.type = type; + m.direction = direction; + m.content = content; + m.created = (uint64_t)time(NULL); + m.modified = m.created; + m.sent = 0; + m.signer_index = signer_index; + if (direction == message_direction::out) + { + m.state = message_state::ready_to_send; + } + else + { + m.state = message_state::waiting; + }; + m.wallet_height = (uint32_t)state.num_transfer_details; + if (m.type == message_type::additional_key_set) + { + m.round = state.multisig_rounds_passed; + } + else + { + m.round = 0; + } + m.signature_count = 0; // Future expansion for signature counting when signing txs + m.hash = crypto::null_hash; + m_messages.push_back(m); + + // Save for every new message right away (at least while in beta) + save(state); + + MINFO(boost::format("Added %s message %s for signer %s of type %s") + % message_direction_to_string(direction) % m.id % signer_index % message_type_to_string(type)); + return m_messages.size() - 1; +} + +// Get the index of the message with id "id", return false if not found +bool message_store::get_message_index_by_id(uint32_t id, size_t &index) const +{ + for (size_t i = 0; i < m_messages.size(); ++i) + { + if (m_messages[i].id == id) + { + index = i; + return true; + } + } + MWARNING("No message found with an id of " << id); + return false; +} + +// Get the index of the message with id "id" that must exist +size_t message_store::get_message_index_by_id(uint32_t id) const +{ + size_t index; + bool found = get_message_index_by_id(id, index); + THROW_WALLET_EXCEPTION_IF(!found, tools::error::wallet_internal_error, "Invalid message id " + id); + return index; +} + +// Get the modifiable message with id "id" that must exist; private/internal use! +message& message_store::get_message_ref_by_id(uint32_t id) +{ + return m_messages[get_message_index_by_id(id)]; +} + +// Get the message with id "id", return false if not found +// This version of the method allows to check whether id is valid without triggering an error +bool message_store::get_message_by_id(uint32_t id, message &m) const +{ + size_t index; + bool found = get_message_index_by_id(id, index); + if (found) + { + m = m_messages[index]; + } + return found; +} + +// Get the message with id "id" that must exist +message message_store::get_message_by_id(uint32_t id) const +{ + message m; + bool found = get_message_by_id(id, m); + THROW_WALLET_EXCEPTION_IF(!found, tools::error::wallet_internal_error, "Invalid message id " + id); + return m; +} + +bool message_store::any_message_of_type(message_type type, message_direction direction) const +{ + for (size_t i = 0; i < m_messages.size(); ++i) + { + if ((m_messages[i].type == type) && (m_messages[i].direction == direction)) + { + return true; + } + } + return false; +} + +bool message_store::any_message_with_hash(const crypto::hash &hash) const +{ + for (size_t i = 0; i < m_messages.size(); ++i) + { + if (m_messages[i].hash == hash) + { + return true; + } + } + return false; +} + +// Count the ids in the vector that are set i.e. not 0, while ignoring index 0 +// Mostly used to check whether we have a message for each authorized signer except me, +// with the signer index used as index into 'ids'; the element at index 0, for me, +// is ignored, to make constant subtractions of 1 for indices when filling the +// vector unnecessary +size_t message_store::get_other_signers_id_count(const std::vector<uint32_t> &ids) const +{ + size_t count = 0; + for (size_t i = 1 /* and not 0 */; i < ids.size(); ++i) + { + if (ids[i] != 0) + { + count++; + } + } + return count; +} + +// Is in every element of vector 'ids' (except at index 0) a message id i.e. not 0? +bool message_store::message_ids_complete(const std::vector<uint32_t> &ids) const +{ + return get_other_signers_id_count(ids) == (ids.size() - 1); +} + +void message_store::delete_message(uint32_t id) +{ + delete_transport_message(id); + size_t index = get_message_index_by_id(id); + m_messages.erase(m_messages.begin() + index); +} + +void message_store::delete_all_messages() +{ + for (size_t i = 0; i < m_messages.size(); ++i) + { + delete_transport_message(m_messages[i].id); + } + m_messages.clear(); +} + +// Make a message text, which is "attacker controlled data", reasonably safe to display +// This is mostly geared towards the safe display of notes sent by "mms note" with a "mms show" command +void message_store::get_sanitized_message_text(const message &m, std::string &sanitized_text) const +{ + sanitized_text.clear(); + + // Restrict the size to fend of DOS-style attacks with heaps of data + size_t length = std::min(m.content.length(), (size_t)1000); + + for (size_t i = 0; i < length; ++i) + { + char c = m.content[i]; + if ((int)c < 32) + { + // Strip out any controls, especially ESC for getting rid of potentially dangerous + // ANSI escape sequences that a console window might interpret + c = ' '; + } + else if ((c == '<') || (c == '>')) + { + // Make XML or HTML impossible that e.g. might contain scripts that Qt might execute + // when displayed in the GUI wallet + c = ' '; + } + sanitized_text += c; + } +} + +void message_store::write_to_file(const multisig_wallet_state &state, const std::string &filename) +{ + std::stringstream oss; + boost::archive::portable_binary_oarchive ar(oss); + ar << *this; + std::string buf = oss.str(); + + crypto::chacha_key key; + crypto::generate_chacha_key(&state.view_secret_key, sizeof(crypto::secret_key), key, 1); + + file_data write_file_data = boost::value_initialized<file_data>(); + write_file_data.magic_string = "MMS"; + write_file_data.file_version = 0; + write_file_data.iv = crypto::rand<crypto::chacha_iv>(); + std::string encrypted_data; + encrypted_data.resize(buf.size()); + crypto::chacha20(buf.data(), buf.size(), key, write_file_data.iv, &encrypted_data[0]); + write_file_data.encrypted_data = encrypted_data; + + std::stringstream file_oss; + boost::archive::portable_binary_oarchive file_ar(file_oss); + file_ar << write_file_data; + + bool success = epee::file_io_utils::save_string_to_file(filename, file_oss.str()); + THROW_WALLET_EXCEPTION_IF(!success, tools::error::file_save_error, filename); +} + +void message_store::read_from_file(const multisig_wallet_state &state, const std::string &filename) +{ + boost::system::error_code ignored_ec; + bool file_exists = boost::filesystem::exists(filename, ignored_ec); + if (!file_exists) + { + // Simply do nothing if the file is not there; allows e.g. easy recovery + // from problems with the MMS by deleting the file + MERROR("No message store file found: " << filename); + return; + } + + std::string buf; + bool success = epee::file_io_utils::load_file_to_string(filename, buf); + THROW_WALLET_EXCEPTION_IF(!success, tools::error::file_read_error, filename); + + file_data read_file_data; + try + { + std::stringstream iss; + iss << buf; + boost::archive::portable_binary_iarchive ar(iss); + ar >> read_file_data; + } + catch (const std::exception &e) + { + MERROR("MMS file " << filename << " has bad structure <iv,encrypted_data>: " << e.what()); + THROW_WALLET_EXCEPTION_IF(true, tools::error::file_read_error, filename); + } + + crypto::chacha_key key; + crypto::generate_chacha_key(&state.view_secret_key, sizeof(crypto::secret_key), key, 1); + std::string decrypted_data; + decrypted_data.resize(read_file_data.encrypted_data.size()); + crypto::chacha20(read_file_data.encrypted_data.data(), read_file_data.encrypted_data.size(), key, read_file_data.iv, &decrypted_data[0]); + + try + { + std::stringstream iss; + iss << decrypted_data; + boost::archive::portable_binary_iarchive ar(iss); + ar >> *this; + } + catch (const std::exception &e) + { + MERROR("MMS file " << filename << " has bad structure: " << e.what()); + THROW_WALLET_EXCEPTION_IF(true, tools::error::file_read_error, filename); + } + + m_filename = filename; +} + +// Save to the same file this message store was loaded from +// Called after changes deemed "important", to make it less probable to lose messages in case of +// a crash; a better and long-term solution would of course be to use LMDB ... +void message_store::save(const multisig_wallet_state &state) +{ + if (!m_filename.empty()) + { + write_to_file(state, m_filename); + } +} + +bool message_store::get_processable_messages(const multisig_wallet_state &state, + bool force_sync, std::vector<processing_data> &data_list, std::string &wait_reason) +{ + uint32_t wallet_height = (uint32_t)state.num_transfer_details; + data_list.clear(); + wait_reason.clear(); + // In all scans over all messages looking for complete sets (1 message for each signer), + // if there are duplicates, the OLDEST of them is taken. This may not play a role with + // any of the current message types, but may with future ones, and it's probably a good + // idea to have a clear and somewhat defensive strategy. + + std::vector<uint32_t> auto_config_messages(m_num_authorized_signers, 0); + bool any_auto_config = false; + + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if ((m.type == message_type::auto_config_data) && (m.state == message_state::waiting)) + { + if (auto_config_messages[m.signer_index] == 0) + { + auto_config_messages[m.signer_index] = m.id; + any_auto_config = true; + } + // else duplicate auto config data, ignore + } + } + + if (any_auto_config) + { + bool auto_config_complete = message_ids_complete(auto_config_messages); + if (auto_config_complete) + { + processing_data data; + data.processing = message_processing::process_auto_config_data; + data.message_ids = auto_config_messages; + data.message_ids.erase(data.message_ids.begin()); + data_list.push_back(data); + return true; + } + else + { + wait_reason = tr("Auto-config cannot proceed because auto config data from other signers is not complete"); + return false; + // With ANY auto config data present but not complete refuse to check for any + // other processing. Manually delete those messages to abort such an auto config + // phase if needed. + } + } + + // Any signer config that arrived will be processed right away, regardless of other things that may wait + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if ((m.type == message_type::signer_config) && (m.state == message_state::waiting)) + { + processing_data data; + data.processing = message_processing::process_signer_config; + data.message_ids.push_back(m.id); + data_list.push_back(data); + return true; + } + } + + // ALL of the following processings depend on the signer info being complete + if (!signer_config_complete()) + { + wait_reason = tr("The signer config is not complete."); + return false; + } + + if (!state.multisig) + { + + if (!any_message_of_type(message_type::key_set, message_direction::out)) + { + // With the own key set not yet ready we must do "prepare_multisig" first; + // Key sets from other signers may be here already, but if we process them now + // the wallet will go multisig too early: we can't produce our own key set any more! + processing_data data; + data.processing = message_processing::prepare_multisig; + data_list.push_back(data); + return true; + } + + // Ids of key set messages per signer index, to check completeness + // Naturally, does not care about the order of the messages and is trivial to secure against + // key sets that were received more than once + // With full M/N multisig now possible consider only key sets of the right round, i.e. + // with not yet multisig the only possible round 0 + std::vector<uint32_t> key_set_messages(m_num_authorized_signers, 0); + + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if ((m.type == message_type::key_set) && (m.state == message_state::waiting) + && (m.round == 0)) + { + if (key_set_messages[m.signer_index] == 0) + { + key_set_messages[m.signer_index] = m.id; + } + // else duplicate key set, ignore + } + } + + bool key_sets_complete = message_ids_complete(key_set_messages); + if (key_sets_complete) + { + // Nothing else can be ready to process earlier than this, ignore everything else and give back + processing_data data; + data.processing = message_processing::make_multisig; + data.message_ids = key_set_messages; + data.message_ids.erase(data.message_ids.begin()); + data_list.push_back(data); + return true; + } + else + { + wait_reason = tr("Wallet can't go multisig because key sets from other signers are missing or not complete."); + return false; + } + } + + if (state.multisig && !state.multisig_is_ready) + { + // In the case of M/N multisig the call 'wallet2::multisig' returns already true + // after "make_multisig" but with calls to "exchange_multisig_keys" still needed, and + // sets the parameter 'ready' to false to document this particular "in-between" state. + // So what may be possible here, with all necessary messages present, is a call to + // "exchange_multisig_keys". + // Consider only messages belonging to the next round to do, which has the number + // "state.multisig_rounds_passed". + std::vector<uint32_t> additional_key_set_messages(m_num_authorized_signers, 0); + + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if ((m.type == message_type::additional_key_set) && (m.state == message_state::waiting) + && (m.round == state.multisig_rounds_passed)) + { + if (additional_key_set_messages[m.signer_index] == 0) + { + additional_key_set_messages[m.signer_index] = m.id; + } + // else duplicate key set, ignore + } + } + + bool key_sets_complete = message_ids_complete(additional_key_set_messages); + if (key_sets_complete) + { + processing_data data; + data.processing = message_processing::exchange_multisig_keys; + data.message_ids = additional_key_set_messages; + data.message_ids.erase(data.message_ids.begin()); + data_list.push_back(data); + return true; + } + else + { + wait_reason = tr("Wallet can't start another key exchange round because key sets from other signers are missing or not complete."); + return false; + } + } + + // Properly exchanging multisig sync data is easiest and most transparent + // for the user if a wallet sends its own data first and processes any received + // sync data afterwards so that's the order that the MMS enforces here. + // (Technically, it seems to work also the other way round.) + // + // To check whether a NEW round of syncing is necessary the MMS works with a + // "wallet state": new state means new syncing needed. + // + // The MMS monitors the "wallet state" by recording "wallet heights" as + // numbers of transfers present in a wallet at the time of message creation. While + // not watertight, this quite simple scheme should already suffice to trigger + // and orchestrate a sensible exchange of sync data. + if (state.has_multisig_partial_key_images || force_sync) + { + // Sync is necessary and not yet completed: Processing of transactions + // will only be possible again once properly synced + // Check first whether we generated already OUR sync info; take note of + // any processable sync info from other signers on the way in case we need it + bool own_sync_data_created = false; + std::vector<uint32_t> sync_messages(m_num_authorized_signers, 0); + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if ((m.type == message_type::multisig_sync_data) && (force_sync || (m.wallet_height == wallet_height))) + // It's data for the same "round" of syncing, on the same "wallet height", therefore relevant + // With "force_sync" take ANY waiting sync data, maybe it will work out + { + if (m.direction == message_direction::out) + { + own_sync_data_created = true; + // Ignore whether sent already or not, and assume as complete if several other signers there + } + else if ((m.direction == message_direction::in) && (m.state == message_state::waiting)) + { + if (sync_messages[m.signer_index] == 0) + { + sync_messages[m.signer_index] = m.id; + } + // else duplicate sync message, ignore + } + } + } + if (!own_sync_data_created) + { + // As explained above, creating sync data BEFORE processing such data from + // other signers reliably works, so insist on that here + processing_data data; + data.processing = message_processing::create_sync_data; + data_list.push_back(data); + return true; + } + uint32_t id_count = (uint32_t)get_other_signers_id_count(sync_messages); + // Do we have sync data from ALL other signers? + bool all_sync_data = id_count == (m_num_authorized_signers - 1); + // Do we have just ENOUGH sync data to have a minimal viable sync set? + // In cases like 2/3 multisig we don't need messages from ALL other signers, only + // from enough of them i.e. num_required_signers minus 1 messages + bool enough_sync_data = id_count >= (m_num_required_signers - 1); + bool sync = false; + wait_reason = tr("Syncing not done because multisig sync data from other signers are missing or not complete."); + if (all_sync_data) + { + sync = true; + } + else if (enough_sync_data) + { + if (force_sync) + { + sync = true; + } + else + { + // Don't sync, but give a hint how this minimal set COULD be synced if really wanted + wait_reason += (boost::format("\nUse \"mms next sync\" if you want to sync with just %s out of %s authorized signers and transact just with them") + % (m_num_required_signers - 1) % (m_num_authorized_signers - 1)).str(); + } + } + if (sync) + { + processing_data data; + data.processing = message_processing::process_sync_data; + for (size_t i = 0; i < sync_messages.size(); ++i) + { + uint32_t id = sync_messages[i]; + if (id != 0) + { + data.message_ids.push_back(id); + } + } + data_list.push_back(data); + return true; + } + else + { + // We can't proceed to any transactions until we have synced; "wait_reason" already set above + return false; + } + } + + bool waiting_found = false; + bool note_found = false; + bool sync_data_found = false; + for (size_t i = 0; i < m_messages.size(); ++i) + { + message &m = m_messages[i]; + if (m.state == message_state::waiting) + { + waiting_found = true; + switch (m.type) + { + case message_type::fully_signed_tx: + { + // We can either submit it ourselves, or send it to any other signer for submission + processing_data data; + data.processing = message_processing::submit_tx; + data.message_ids.push_back(m.id); + data_list.push_back(data); + + data.processing = message_processing::send_tx; + for (uint32_t j = 1; j < m_num_authorized_signers; ++j) + { + data.receiving_signer_index = j; + data_list.push_back(data); + } + return true; + } + + case message_type::partially_signed_tx: + { + if (m.signer_index == 0) + { + // We started this ourselves, or signed it but with still signatures missing: + // We can send it to any other signer for signing / further signing + // In principle it does not make sense to send it back to somebody who + // already signed, but the MMS does not / not yet keep track of that, + // because that would be somewhat complicated. + processing_data data; + data.processing = message_processing::send_tx; + data.message_ids.push_back(m.id); + for (uint32_t j = 1; j < m_num_authorized_signers; ++j) + { + data.receiving_signer_index = j; + data_list.push_back(data); + } + return true; + } + else + { + // Somebody else sent this to us: We can sign it + // It would be possible to just pass it on, but that's not directly supported here + processing_data data; + data.processing = message_processing::sign_tx; + data.message_ids.push_back(m.id); + data_list.push_back(data); + return true; + } + } + + case message_type::note: + note_found = true; + break; + + case message_type::multisig_sync_data: + sync_data_found = true; + break; + + default: + break; + } + } + } + if (waiting_found) + { + wait_reason = tr("There are waiting messages, but nothing is ready to process under normal circumstances"); + if (sync_data_found) + { + wait_reason += tr("\nUse \"mms next sync\" if you want to force processing of the waiting sync data"); + } + if (note_found) + { + wait_reason += tr("\nUse \"mms note\" to display the waiting notes"); + } + } + else + { + wait_reason = tr("There are no messages waiting to be processed."); + } + + return false; +} + +void message_store::set_messages_processed(const processing_data &data) +{ + for (size_t i = 0; i < data.message_ids.size(); ++i) + { + set_message_processed_or_sent(data.message_ids[i]); + } +} + +void message_store::set_message_processed_or_sent(uint32_t id) +{ + message &m = get_message_ref_by_id(id); + if (m.state == message_state::waiting) + { + // So far a fairly cautious and conservative strategy: Only delete from Bitmessage + // when fully processed (and e.g. not already after reception and writing into + // the message store file) + delete_transport_message(id); + m.state = message_state::processed; + } + else if (m.state == message_state::ready_to_send) + { + m.state = message_state::sent; + } + m.modified = (uint64_t)time(NULL); +} + +void message_store::encrypt(crypto::public_key public_key, const std::string &plaintext, + std::string &ciphertext, crypto::public_key &encryption_public_key, crypto::chacha_iv &iv) +{ + crypto::secret_key encryption_secret_key; + crypto::generate_keys(encryption_public_key, encryption_secret_key); + + crypto::key_derivation derivation; + bool success = crypto::generate_key_derivation(public_key, encryption_secret_key, derivation); + THROW_WALLET_EXCEPTION_IF(!success, tools::error::wallet_internal_error, "Failed to generate key derivation for message encryption"); + + crypto::chacha_key chacha_key; + crypto::generate_chacha_key(&derivation, sizeof(derivation), chacha_key, 1); + iv = crypto::rand<crypto::chacha_iv>(); + ciphertext.resize(plaintext.size()); + crypto::chacha20(plaintext.data(), plaintext.size(), chacha_key, iv, &ciphertext[0]); +} + +void message_store::decrypt(const std::string &ciphertext, const crypto::public_key &encryption_public_key, const crypto::chacha_iv &iv, + const crypto::secret_key &view_secret_key, std::string &plaintext) +{ + crypto::key_derivation derivation; + bool success = crypto::generate_key_derivation(encryption_public_key, view_secret_key, derivation); + THROW_WALLET_EXCEPTION_IF(!success, tools::error::wallet_internal_error, "Failed to generate key derivation for message decryption"); + crypto::chacha_key chacha_key; + crypto::generate_chacha_key(&derivation, sizeof(derivation), chacha_key, 1); + plaintext.resize(ciphertext.size()); + crypto::chacha20(ciphertext.data(), ciphertext.size(), chacha_key, iv, &plaintext[0]); +} + +void message_store::send_message(const multisig_wallet_state &state, uint32_t id) +{ + message &m = get_message_ref_by_id(id); + const authorized_signer &me = m_signers[0]; + const authorized_signer &receiver = m_signers[m.signer_index]; + transport_message dm; + crypto::public_key public_key; + + dm.timestamp = (uint64_t)time(NULL); + dm.subject = "MMS V0 " + tools::get_human_readable_timestamp(dm.timestamp); + dm.source_transport_address = me.transport_address; + dm.source_monero_address = me.monero_address; + if (m.type == message_type::auto_config_data) + { + // Encrypt with the public key derived from the auto-config token, and send to the + // transport address likewise derived from that token + public_key = me.auto_config_public_key; + dm.destination_transport_address = me.auto_config_transport_address; + // The destination Monero address is not yet known + memset(&dm.destination_monero_address, 0, sizeof(cryptonote::account_public_address)); + } + else + { + // Encrypt with the receiver's view public key + public_key = receiver.monero_address.m_view_public_key; + const authorized_signer &receiver = m_signers[m.signer_index]; + dm.destination_monero_address = receiver.monero_address; + dm.destination_transport_address = receiver.transport_address; + } + encrypt(public_key, m.content, dm.content, dm.encryption_public_key, dm.iv); + dm.type = (uint32_t)m.type; + dm.hash = crypto::cn_fast_hash(dm.content.data(), dm.content.size()); + dm.round = m.round; + + crypto::generate_signature(dm.hash, me.monero_address.m_view_public_key, state.view_secret_key, dm.signature); + + m_transporter.send_message(dm); + + m.state=message_state::sent; + m.sent= (uint64_t)time(NULL); +} + +bool message_store::check_for_messages(const multisig_wallet_state &state, std::vector<message> &messages) +{ + m_run.store(true, std::memory_order_relaxed); + const authorized_signer &me = m_signers[0]; + std::vector<std::string> destinations; + destinations.push_back(me.transport_address); + for (uint32_t i = 1; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.auto_config_running) + { + destinations.push_back(m.auto_config_transport_address); + } + } + std::vector<transport_message> transport_messages; + bool r = m_transporter.receive_messages(destinations, transport_messages); + if (!m_run.load(std::memory_order_relaxed)) + { + // Stop was called, don't waste time processing the messages + // (but once started processing them, don't react to stop request anymore, avoid receiving them "partially)" + return false; + } + + bool new_messages = false; + for (size_t i = 0; i < transport_messages.size(); ++i) + { + transport_message &rm = transport_messages[i]; + if (any_message_with_hash(rm.hash)) + { + // Already seen, do not take again + } + else + { + uint32_t sender_index; + bool take = false; + message_type type = static_cast<message_type>(rm.type); + crypto::secret_key decrypt_key = state.view_secret_key; + if (type == message_type::auto_config_data) + { + // Find out which signer sent it by checking which auto config transport address + // the message was sent to + for (uint32_t i = 1; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + if (m.auto_config_transport_address == rm.destination_transport_address) + { + take = true; + sender_index = i; + decrypt_key = m.auto_config_secret_key; + break; + } + } + } + else if (type == message_type::signer_config) + { + // Typically we can't check yet whether we know the sender, so take from any + // and pretend it's from "me" because we might have nothing else yet + take = true; + sender_index = 0; + } + else + { + // Only accept from senders that are known as signer here, otherwise just ignore + take = get_signer_index_by_monero_address(rm.source_monero_address, sender_index); + } + if (take && (type != message_type::auto_config_data)) + { + // If the destination address is known, check it as well; this additional filter + // allows using the same transport address for multiple signers + take = rm.destination_monero_address == me.monero_address; + } + if (take) + { + crypto::hash actual_hash = crypto::cn_fast_hash(rm.content.data(), rm.content.size()); + THROW_WALLET_EXCEPTION_IF(actual_hash != rm.hash, tools::error::wallet_internal_error, "Message hash mismatch"); + + bool signature_valid = crypto::check_signature(actual_hash, rm.source_monero_address.m_view_public_key, rm.signature); + THROW_WALLET_EXCEPTION_IF(!signature_valid, tools::error::wallet_internal_error, "Message signature not valid"); + + std::string plaintext; + decrypt(rm.content, rm.encryption_public_key, rm.iv, decrypt_key, plaintext); + size_t index = add_message(state, sender_index, (message_type)rm.type, message_direction::in, plaintext); + message &m = m_messages[index]; + m.hash = rm.hash; + m.transport_id = rm.transport_id; + m.sent = rm.timestamp; + m.round = rm.round; + m.signature_count = rm.signature_count; + messages.push_back(m); + new_messages = true; + } + } + } + return new_messages; +} + +void message_store::delete_transport_message(uint32_t id) +{ + const message &m = get_message_by_id(id); + if (!m.transport_id.empty()) + { + m_transporter.delete_message(m.transport_id); + } +} + +std::string message_store::account_address_to_string(const cryptonote::account_public_address &account_address) const +{ + return get_account_address_as_str(m_nettype, false, account_address); +} + +const char* message_store::message_type_to_string(message_type type) +{ + switch (type) + { + case message_type::key_set: + return tr("key set"); + case message_type::additional_key_set: + return tr("additional key set"); + case message_type::multisig_sync_data: + return tr("multisig sync data"); + case message_type::partially_signed_tx: + return tr("partially signed tx"); + case message_type::fully_signed_tx: + return tr("fully signed tx"); + case message_type::note: + return tr("note"); + case message_type::signer_config: + return tr("signer config"); + case message_type::auto_config_data: + return tr("auto-config data"); + default: + return tr("unknown message type"); + } +} + +const char* message_store::message_direction_to_string(message_direction direction) +{ + switch (direction) + { + case message_direction::in: + return tr("in"); + case message_direction::out: + return tr("out"); + default: + return tr("unknown message direction"); + } +} + +const char* message_store::message_state_to_string(message_state state) +{ + switch (state) + { + case message_state::ready_to_send: + return tr("ready to send"); + case message_state::sent: + return tr("sent"); + case message_state::waiting: + return tr("waiting"); + case message_state::processed: + return tr("processed"); + case message_state::cancelled: + return tr("cancelled"); + default: + return tr("unknown message state"); + } +} + +// Convert a signer to string suitable for a column in a list, with 'max_width' +// Format: label: transport_address +std::string message_store::signer_to_string(const authorized_signer &signer, uint32_t max_width) +{ + std::string s = ""; + s.reserve(max_width); + uint32_t avail = max_width; + uint32_t label_len = signer.label.length(); + if (label_len > avail) + { + s.append(signer.label.substr(0, avail - 2)); + s.append(".."); + return s; + } + s.append(signer.label); + avail -= label_len; + uint32_t transport_addr_len = signer.transport_address.length(); + if ((transport_addr_len > 0) && (avail > 10)) + { + s.append(": "); + avail -= 2; + if (transport_addr_len <= avail) + { + s.append(signer.transport_address); + } + else + { + s.append(signer.transport_address.substr(0, avail-2)); + s.append(".."); + } + } + return s; +} + +} |