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Merge pull request #5778

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8703aa5 MMS: Use chans instead of normal addresses for auto-config (rbrunner7)
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luigi1111 2019-08-21 15:31:11 -05:00
commit 11ab328ce3
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3 changed files with 41 additions and 35 deletions
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14
src/wallet/message_store.cpp
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@ -397,10 +397,9 @@ 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())
if (!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
// Try to delete the chan that was used for auto-config
m_transporter.delete_transport_address(m.auto_config_transport_address);
}
m.auto_config_token.clear();
@ -429,14 +428,7 @@ void message_store::setup_signer_for_auto_config(uint32_t index, const std::stri
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);
}
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

61
src/wallet/message_transporter.cpp
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@ -192,47 +192,47 @@ bool message_transporter::delete_message(const std::string &transport_id)
return true;
}
// Deterministically derive a transport / Bitmessage address from 'seed' (the 10-hex-digits
// auto-config token will be used), but do not set it up for receiving in PyBitmessage as
// well, because it's possible the address will only ever be used to SEND auto-config data
// Deterministically derive a new transport address from 'seed' (the 10-hex-digits auto-config
// token will be used) and set it up for sending and receiving
// In a first attempt a normal Bitmessage address was used here, but it turned out the
// key exchange necessary to put it into service could take a long time or even did not
// work out at all sometimes. Also there were problems when deleting those temporary
// addresses again after auto-config. Now a chan is used which avoids all these drawbacks
// quite nicely.
std::string message_transporter::derive_transport_address(const std::string &seed)
{
// Don't use the seed directly as chan name; that would be too dangerous, e.g. in the
// case of a PyBitmessage instance used by multiple unrelated people
// If an auto-config token gets hashed in another context use different salt instead of "chan"
std::string salted_seed = seed + "chan";
std::string chan_name = epee::string_tools::pod_to_hex(crypto::cn_fast_hash(salted_seed.data(), salted_seed.size()));
// Calculate the Bitmessage address that the chan will get for being able to
// use 'joinChain', as 'createChan' will fail and not tell the address if the chan
// already exists (which it can if all auto-config participants share a PyBitmessage
// instance). 'joinChan' will also fail in that case, but that won't matter.
std::string request;
start_xml_rpc_cmd(request, "getDeterministicAddress");
add_xml_rpc_base64_param(request, seed);
add_xml_rpc_base64_param(request, chan_name);
add_xml_rpc_integer_param(request, 4); // addressVersionNumber
add_xml_rpc_integer_param(request, 1); // streamNumber
end_xml_rpc_cmd(request);
std::string answer;
post_request(request, answer);
std::string address = get_str_between_tags(answer, "<string>", "</string>");
return address;
}
// Derive a transport address and configure it for receiving in PyBitmessage, typically
// for receiving auto-config messages by the wallet of the auto-config organizer
std::string message_transporter::derive_and_receive_transport_address(const std::string &seed)
{
// We need to call both "get_deterministic_address" AND "createDeterministicAddresses"
// because we won't get back the address from the latter call if it exists already
std::string address = derive_transport_address(seed);
std::string request;
start_xml_rpc_cmd(request, "createDeterministicAddresses");
add_xml_rpc_base64_param(request, seed);
add_xml_rpc_integer_param(request, 1); // numberOfAddresses
add_xml_rpc_integer_param(request, 4); // addressVersionNumber
start_xml_rpc_cmd(request, "joinChan");
add_xml_rpc_base64_param(request, chan_name);
add_xml_rpc_string_param(request, address);
end_xml_rpc_cmd(request);
std::string answer;
post_request(request, answer);
return address;
}
bool message_transporter::delete_transport_address(const std::string &transport_address)
{
std::string request;
start_xml_rpc_cmd(request, "deleteAddress");
start_xml_rpc_cmd(request, "leaveChan");
add_xml_rpc_string_param(request, transport_address);
end_xml_rpc_cmd(request);
std::string answer;
@ -270,7 +270,22 @@ bool message_transporter::post_request(const std::string &request, std::string &
std::string string_value = get_str_between_tags(answer, "<string>", "</string>");
if ((string_value.find("API Error") == 0) || (string_value.find("RPC ") == 0))
{
THROW_WALLET_EXCEPTION(tools::error::bitmessage_api_error, string_value);
if ((string_value.find("API Error 0021") == 0) && (request.find("joinChan") != std::string::npos))
{
// Error that occurs if one tries to join an already joined chan, which can happen
// if several auto-config participants share one PyBitmessage instance: As a little
// hack simply ignore the error. (A clean solution would be to check for the chan
// with 'listAddresses2', but parsing the returned array is much more complicated.)
}
else if ((string_value.find("API Error 0013") == 0) && (request.find("leaveChan") != std::string::npos))
{
// Error that occurs if one tries to leave an already left / deleted chan, which can happen
// if several auto-config participants share one PyBitmessage instance: Also ignore.
}
else
{
THROW_WALLET_EXCEPTION(tools::error::bitmessage_api_error, string_value);
}
}
return r;

1
src/wallet/message_transporter.h
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@ -91,7 +91,6 @@ public:
bool delete_message(const std::string &transport_id);
void stop() { m_run.store(false, std::memory_order_relaxed); }
std::string derive_transport_address(const std::string &seed);
std::string derive_and_receive_transport_address(const std::string &seed);
bool delete_transport_address(const std::string &transport_address);
private: