diff options
| -rw-r--r-- | src/simplewallet/simplewallet.cpp | 42 | ||||
| -rw-r--r-- | src/simplewallet/simplewallet.h | 2 | ||||
| -rw-r--r-- | src/wallet/message_store.cpp | 101 | ||||
| -rw-r--r-- | src/wallet/message_store.h | 3 |
4 files changed, 121 insertions, 27 deletions
diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp index b1e69161f..9d4b42cbd 100644 --- a/src/simplewallet/simplewallet.cpp +++ b/src/simplewallet/simplewallet.cpp @@ -250,6 +250,7 @@ namespace const char* USAGE_MMS_SET("mms set <option_name> [<option_value>]"); const char* USAGE_MMS_SEND_SIGNER_CONFIG("mms send_signer_config"); const char* USAGE_MMS_START_AUTO_CONFIG("mms start_auto_config [<label> <label> ...]"); + const char* USAGE_MMS_CONFIG_CHECKSUM("mms config_checksum"); const char* USAGE_MMS_STOP_AUTO_CONFIG("mms stop_auto_config"); const char* USAGE_MMS_AUTO_CONFIG("mms auto_config <auto_config_token>"); const char* USAGE_PRINT_RING("print_ring <key_image> | <txid>"); @@ -3460,7 +3461,7 @@ simple_wallet::simple_wallet() tr("Interface with the MMS (Multisig Messaging System)\n" "<subcommand> is one of:\n" " init, info, signer, list, next, sync, transfer, delete, send, receive, export, note, show, set, help\n" - " send_signer_config, start_auto_config, stop_auto_config, auto_config\n" + " send_signer_config, start_auto_config, stop_auto_config, auto_config, config_checksum\n" "Get help about a subcommand with: help_advanced mms <subcommand>")); m_cmd_binder.set_handler("mms init", boost::bind(&simple_wallet::on_command, this, &simple_wallet::mms, _1), @@ -3529,6 +3530,10 @@ simple_wallet::simple_wallet() boost::bind(&simple_wallet::on_command, this, &simple_wallet::mms, _1), tr(USAGE_MMS_START_AUTO_CONFIG), tr("Start auto-config at the auto-config manager's wallet by issuing auto-config tokens and optionally set others' labels")); + m_cmd_binder.set_handler("mms config_checksum", + boost::bind(&simple_wallet::on_command, this, &simple_wallet::mms, _1), + tr(USAGE_MMS_CONFIG_CHECKSUM), + tr("Get a checksum that allows signers to easily check for identical MMS configuration")); m_cmd_binder.set_handler("mms stop_auto_config", boost::bind(&simple_wallet::on_command, this, &simple_wallet::mms, _1), tr(USAGE_MMS_STOP_AUTO_CONFIG), @@ -10361,6 +10366,14 @@ bool simple_wallet::user_confirms(const std::string &question) return !std::cin.eof() && command_line::is_yes(answer); } +bool simple_wallet::user_confirms_auto_config() +{ + message_writer(console_color_red, true) << tr("WARNING: Using MMS auto-config mechanisms is not trustless"); + message_writer() << tr("A malicious auto-config manager could send you info about own wallets instead of other signers' info"); + message_writer() << tr("If in doubt do not use auto-config or at least compare configs using the \"mms config_checksum\" command"); + return user_confirms("Accept the risks and continue?"); +} + bool simple_wallet::get_number_from_arg(const std::string &arg, uint32_t &number, const uint32_t lower_bound, const uint32_t upper_bound) { bool valid = false; @@ -10513,7 +10526,7 @@ void simple_wallet::show_message(const mms::message &m) case mms::message_type::additional_key_set: case mms::message_type::note: display_content = true; - ms.get_sanitized_message_text(m, sanitized_text); + sanitized_text = mms::message_store::get_sanitized_text(m.content, 1000); break; default: display_content = false; @@ -10862,6 +10875,11 @@ void simple_wallet::mms_next(const std::vector<std::string> &args) { break; } + if (!user_confirms_auto_config()) + { + message_writer() << tr("You can use the \"mms delete\" command to delete any unwanted message"); + break; + } } ms.process_signer_config(state, m.content); ms.stop_auto_config(); @@ -11188,6 +11206,18 @@ void simple_wallet::mms_start_auto_config(const std::vector<std::string> &args) list_signers(ms.get_all_signers()); } +void simple_wallet::mms_config_checksum(const std::vector<std::string> &args) +{ + if (args.size() != 0) + { + fail_msg_writer() << tr("Usage: mms config_checksum"); + return; + } + mms::message_store& ms = m_wallet->get_message_store(); + LOCK_IDLE_SCOPE(); + message_writer() << ms.get_config_checksum(); +} + void simple_wallet::mms_stop_auto_config(const std::vector<std::string> &args) { if (args.size() != 0) @@ -11218,6 +11248,10 @@ void simple_wallet::mms_auto_config(const std::vector<std::string> &args) fail_msg_writer() << tr("Invalid auto-config token"); return; } + if (!user_confirms_auto_config()) + { + return; + } mms::authorized_signer me = ms.get_signer(0); if (me.auto_config_running) { @@ -11330,6 +11364,10 @@ bool simple_wallet::mms(const std::vector<std::string> &args) { mms_start_auto_config(mms_args); } + else if (sub_command == "config_checksum") + { + mms_config_checksum(mms_args); + } else if (sub_command == "stop_auto_config") { mms_stop_auto_config(mms_args); diff --git a/src/simplewallet/simplewallet.h b/src/simplewallet/simplewallet.h index 59818b303..135406040 100644 --- a/src/simplewallet/simplewallet.h +++ b/src/simplewallet/simplewallet.h @@ -478,6 +478,7 @@ namespace cryptonote void ask_send_all_ready_messages(); void check_for_messages(); bool user_confirms(const std::string &question); + bool user_confirms_auto_config(); bool get_message_from_arg(const std::string &arg, mms::message &m); bool get_number_from_arg(const std::string &arg, uint32_t &number, const uint32_t lower_bound, const uint32_t upper_bound); @@ -498,6 +499,7 @@ namespace cryptonote void mms_help(const std::vector<std::string> &args); void mms_send_signer_config(const std::vector<std::string> &args); void mms_start_auto_config(const std::vector<std::string> &args); + void mms_config_checksum(const std::vector<std::string> &args); void mms_stop_auto_config(const std::vector<std::string> &args); void mms_auto_config(const std::vector<std::string> &args); }; diff --git a/src/wallet/message_store.cpp b/src/wallet/message_store.cpp index 25a8bd4ef..fb07b42f0 100644 --- a/src/wallet/message_store.cpp +++ b/src/wallet/message_store.cpp @@ -39,6 +39,7 @@ #include "serialization/binary_utils.h" #include "common/base58.h" #include "common/util.h" +#include "common/utf8.h" #include "string_tools.h" @@ -129,18 +130,18 @@ void message_store::set_signer(const multisig_wallet_state &state, authorized_signer &m = m_signers[index]; if (label) { - m.label = label.get(); + m.label = get_sanitized_text(label.get(), 50); } if (transport_address) { - m.transport_address = transport_address.get(); + m.transport_address = get_sanitized_text(transport_address.get(), 200); } 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 to minimize the chance to loose that info save(state); } @@ -202,6 +203,13 @@ void message_store::unpack_signer_config(const multisig_wallet_state &state, con } 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: " + std::to_string(num_signers)); + for (uint32_t i = 0; i < num_signers; ++i) + { + authorized_signer &m = signers[i]; + m.label = get_sanitized_text(m.label, 50); + m.transport_address = get_sanitized_text(m.transport_address, 200); + m.auto_config_token = get_sanitized_text(m.auto_config_token, 20); + } } void message_store::process_signer_config(const multisig_wallet_state &state, const std::string &signer_config) @@ -242,10 +250,10 @@ void message_store::process_signer_config(const multisig_wallet_state &state, co } } authorized_signer &modify = m_signers[take_index]; - modify.label = m.label; // ALWAYS set label, see comments above + modify.label = get_sanitized_text(m.label, 50); // ALWAYS set label, see comments above if (!modify.me) { - modify.transport_address = m.transport_address; + modify.transport_address = get_sanitized_text(m.transport_address, 200); modify.monero_address_known = m.monero_address_known; if (m.monero_address_known) { @@ -392,6 +400,45 @@ void message_store::process_auto_config_data_message(uint32_t id) signer.auto_config_running = false; } +void add_hash(crypto::hash &sum, const crypto::hash &summand) +{ + for (uint32_t i = 0; i < crypto::HASH_SIZE; ++i) + { + uint32_t x = (uint32_t)sum.data[i]; + uint32_t y = (uint32_t)summand.data[i]; + sum.data[i] = (char)((x + y) % 256); + } +} + +// Calculate a checksum that allows signers to make sure they work with an identical signer config +// by exchanging and comparing checksums out-of-band i.e. not using the MMS; +// Because different signers have a different order of signers in the config work with "adding" +// individual hashes because that operation is commutative +std::string message_store::get_config_checksum() const +{ + crypto::hash sum = crypto::null_hash; + uint32_t num = SWAP32LE(m_num_authorized_signers); + add_hash(sum, crypto::cn_fast_hash(&num, sizeof(num))); + num = SWAP32LE(m_num_required_signers); + add_hash(sum, crypto::cn_fast_hash(&num, sizeof(num))); + for (uint32_t i = 0; i < m_num_authorized_signers; ++i) + { + const authorized_signer &m = m_signers[i]; + add_hash(sum, crypto::cn_fast_hash(m.transport_address.data(), m.transport_address.size())); + if (m.monero_address_known) + { + add_hash(sum, crypto::cn_fast_hash(&m.monero_address.m_spend_public_key, sizeof(m.monero_address.m_spend_public_key))); + add_hash(sum, crypto::cn_fast_hash(&m.monero_address.m_view_public_key, sizeof(m.monero_address.m_view_public_key))); + } + } + std::string checksum_bytes; + checksum_bytes += sum.data[0]; + checksum_bytes += sum.data[1]; + checksum_bytes += sum.data[2]; + checksum_bytes += sum.data[3]; + return epee::string_tools::buff_to_hex_nodelimer(checksum_bytes); +} + void message_store::stop_auto_config() { for (uint32_t i = 0; i < m_num_authorized_signers; ++i) @@ -661,32 +708,38 @@ void message_store::delete_all_messages() m_messages.clear(); } -// Make a message text, which is "attacker controlled data", reasonably safe to display +// Make a 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 +std::string message_store::get_sanitized_text(const std::string &text, size_t max_length) { - 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); + size_t length = std::min(text.length(), max_length); + std::string sanitized_text = text.substr(0, length); - for (size_t i = 0; i < length; ++i) + try { - char c = m.content[i]; - if ((int)c < 32) + sanitized_text = tools::utf8canonical(sanitized_text, [](wint_t c) { - // 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; + if ((c < 0x20) || (c == 0x7f) || (c >= 0x80 && c <= 0x9f)) + { + // 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 = '?'; + } + return c; + }); + } + catch (const std::exception &e) + { + sanitized_text = "(Illegal UTF-8 string)"; } + return sanitized_text; } void message_store::write_to_file(const multisig_wallet_state &state, const std::string &filename) diff --git a/src/wallet/message_store.h b/src/wallet/message_store.h index d40daf186..9055fd776 100644 --- a/src/wallet/message_store.h +++ b/src/wallet/message_store.h @@ -242,6 +242,7 @@ namespace mms size_t add_auto_config_data_message(const multisig_wallet_state &state, const std::string &auto_config_token); void process_auto_config_data_message(uint32_t id); + std::string get_config_checksum() const; void stop_auto_config(); // Process data just created by "me" i.e. the own local wallet, e.g. as the result of a "prepare_multisig" command @@ -275,7 +276,7 @@ namespace mms void set_message_processed_or_sent(uint32_t id); void delete_message(uint32_t id); void delete_all_messages(); - void get_sanitized_message_text(const message &m, std::string &sanitized_text) const; + static std::string get_sanitized_text(const std::string &text, size_t max_length); void send_message(const multisig_wallet_state &state, uint32_t id); bool check_for_messages(const multisig_wallet_state &state, std::vector<message> &messages); |