mirror of
https://github.com/matrix-construct/construct
synced 2024-09-07 09:15:19 +02:00
401 lines
7.3 KiB
C++
401 lines
7.3 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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using namespace ircd;
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extern "C" bool verify__keys(const m::keys &) noexcept;
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static bool cache_get(const string_view &server, const string_view &key_id, const m::keys::closure &);
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static size_t cache_set(const json::object &);
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extern "C" void get__keys(const string_view &server, const string_view &key_id, const m::keys::closure &);
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extern "C" bool query__keys(const string_view &query_server, const m::keys::queries &, const m::keys::closure_bool &);
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mapi::header
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IRCD_MODULE
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{
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"Federation 2.3 :Retrieving Server Keys"
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};
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conf::item<milliseconds>
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query_keys_timeout
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{
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{ "name", "ircd.key.keys.query.timeout" },
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{ "default", 20000L }
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};
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extern "C" bool
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query__keys(const string_view &query_server,
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const m::keys::queries &queries,
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const m::keys::closure_bool &closure)
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try
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{
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assert(!query_server.empty());
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m::v1::key::opts opts;
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opts.remote = net::hostport{query_server};
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opts.dynamic = true;
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const unique_buffer<mutable_buffer> buf
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{
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16_KiB
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};
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m::v1::key::query request
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{
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queries, buf, std::move(opts)
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};
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const milliseconds timeout(query_keys_timeout);
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request.wait(timeout);
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const auto &code
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{
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request.get()
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};
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const json::array &response
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{
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request
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};
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for(const json::object &k : response)
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{
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const m::keys &key{k};
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if(!verify__keys(key))
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{
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log::derror
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{
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"Failed to verify keys for '%s' from '%s'",
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at<"server_name"_>(key),
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query_server
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};
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continue;
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}
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log::debug
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{
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m::log, "Verified keys for '%s' from '%s'",
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at<"server_name"_>(key),
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query_server
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};
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if(!closure(k))
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return false;
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}
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return true;
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}
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catch(const ctx::timeout &e)
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{
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throw m::error
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{
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http::REQUEST_TIMEOUT, "M_TIMEOUT",
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"Failed to query keys from '%s' in time",
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query_server
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};
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}
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conf::item<milliseconds>
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get_keys_timeout
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{
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{ "name", "ircd.key.keys.get.timeout" },
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{ "default", 20000L }
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};
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void
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get__keys(const string_view &server_name,
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const string_view &key_id,
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const m::keys::closure &closure)
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try
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{
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assert(!server_name.empty());
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if(cache_get(server_name, key_id, closure))
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return;
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if(server_name == my_host())
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throw m::NOT_FOUND
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{
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"keys for '%s' (that's myself) not found", server_name
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};
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log::debug
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{
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m::log, "Keys for %s not cached; querying network...", server_name
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};
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m::v1::key::opts opts;
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const unique_buffer<mutable_buffer> buf
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{
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16_KiB
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};
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m::v1::key::keys request
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{
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server_name, buf, std::move(opts)
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};
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const milliseconds timeout(get_keys_timeout);
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request.wait(timeout);
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const auto &status
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{
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request.get()
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};
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const json::object &response
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{
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request
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};
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const json::object &keys
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{
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response
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};
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if(!verify__keys(keys)) throw m::error
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{
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http::UNAUTHORIZED, "M_INVALID_SIGNATURE",
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"Failed to verify keys for '%s'",
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server_name
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};
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log::debug
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{
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m::log, "Verified keys from '%s'", server_name
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};
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cache_set(keys);
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closure(keys);
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}
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catch(const ctx::timeout &e)
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{
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throw m::error
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{
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http::REQUEST_TIMEOUT, "M_TIMEOUT",
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"Failed to fetch keys for '%s' in time",
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server_name
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};
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}
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size_t
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cache_set(const json::object &keys)
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{
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const auto &server_name
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{
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unquote(keys.at("server_name"))
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};
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const m::node::id::buf node_id
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{
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"", server_name
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};
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const m::node::room node_room
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{
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node_id
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};
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if(!exists(node_room.room_id))
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create(node_room, m::me.user_id);
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const json::object &vks
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{
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keys.at("verify_keys")
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};
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size_t ret{0};
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for(const auto &member : vks)
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{
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if(ret > 16)
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return ret;
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const auto &key_id(unquote(member.first));
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send(node_room, m::me.user_id, "ircd.key", key_id, keys);
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++ret;
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}
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return ret;
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}
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bool
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cache_get(const string_view &server_name,
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const string_view &key_id,
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const m::keys::closure &closure)
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{
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const m::node::id::buf node_id
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{
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"", server_name
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};
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const m::node::room node_room
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{
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node_id
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};
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const auto reclosure{[&closure]
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(const m::event &event)
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{
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closure(json::get<"content"_>(event));
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}};
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// Without a key_id we search for the most recent key; note this is not
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// the same as making a state_key="" query, as that would be an actual
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// ircd.key entry without an id (which shouldn't exist).
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return !key_id?
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node_room.get(std::nothrow, "ircd.key", reclosure):
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node_room.get(std::nothrow, "ircd.key", key_id, reclosure);
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}
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bool
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verify__keys(const m::keys &keys)
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noexcept try
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{
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const auto &valid_until_ts
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{
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at<"valid_until_ts"_>(keys)
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};
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if(valid_until_ts < ircd::time<milliseconds>())
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throw ircd::error
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{
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"Key was valid until %s", timestr(valid_until_ts)
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};
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const json::object &verify_keys
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{
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at<"verify_keys"_>(keys)
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};
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const string_view &key_id
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{
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begin(verify_keys)->first
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};
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const json::object &key
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{
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begin(verify_keys)->second
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};
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const ed25519::pk pk
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{
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[&key](auto &pk)
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{
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b64decode(pk, unquote(key.at("key")));
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}
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};
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const json::object &signatures
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{
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at<"signatures"_>(keys)
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};
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const string_view &server_name
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{
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unquote(at<"server_name"_>(keys))
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};
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const json::object &server_signatures
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{
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signatures.at(server_name)
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};
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const ed25519::sig sig{[&server_signatures, &key_id](auto &sig)
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{
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b64decode(sig, unquote(server_signatures.at(key_id)));
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}};
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m::keys copy{keys};
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at<"signatures"_>(copy) = string_view{};
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thread_local char buf[4096];
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const const_buffer preimage
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{
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json::stringify(mutable_buffer{buf}, copy)
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};
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return pk.verify(preimage, sig);
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}
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catch(const std::exception &e)
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{
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log::error
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{
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m::log, "key verification for '%s' failed: %s",
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json::get<"server_name"_>(keys, "<no server name>"_sv),
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e.what()
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};
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return false;
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}
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static void
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create_my_key(const m::event &)
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{
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const json::strung verify_keys{json::members
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{
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{ string_view{m::self::public_key_id},
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{
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{ "key", m::self::public_key_b64 }
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}}
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}};
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const json::members tlsfps
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{
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{ "sha256", m::self::tls_cert_der_sha256_b64 }
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};
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const json::value tlsfp[1]
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{
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{ tlsfps }
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};
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const json::strung tls_fingerprints{json::value
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{
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tlsfp, 1
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}};
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m::keys my_key;
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json::get<"server_name"_>(my_key) = my_host();
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json::get<"old_verify_keys"_>(my_key) = "{}";
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json::get<"valid_until_ts"_>(my_key) = ircd::time<milliseconds>() + duration_cast<milliseconds>(hours(2160)).count();
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json::get<"verify_keys"_>(my_key) = verify_keys;
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json::get<"tls_fingerprints"_>(my_key) = tls_fingerprints;
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const json::strung presig
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{
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my_key
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};
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const ed25519::sig sig
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{
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m::self::secret_key.sign(const_buffer{presig})
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};
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char signature[256];
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const json::strung signatures{json::members
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{
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{ my_host(),
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{
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{ string_view{m::self::public_key_id}, b64encode_unpadded(signature, sig) }
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}}
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}};
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json::get<"signatures"_>(my_key) = signatures;
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cache_set(json::strung{my_key});
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}
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const m::hookfn<>
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create_my_key_hook
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{
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create_my_key,
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{
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{ "_site", "vm.notify" },
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{ "room_id", m::my_node.room_id() },
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{ "type", "m.room.create" },
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}
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};
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