mirror of
https://github.com/matrix-construct/construct
synced 2024-08-24 18:42:16 +02:00
284 lines
6.2 KiB
C++
284 lines
6.2 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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//
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// request
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//
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ircd::m::request::request(const string_view &method,
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const string_view &uri,
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const mutable_buffer &body_buf,
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const json::members &body)
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:request
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{
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my_host(),
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string_view{},
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method,
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uri,
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json::stringify(mutable_buffer{body_buf}, body)
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}
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{}
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ircd::m::request::request(const string_view &method,
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const string_view &uri)
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:request
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{
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my_host(),
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string_view{},
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method,
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uri,
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json::object{}
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}
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{}
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ircd::m::request::request(const string_view &method,
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const string_view &uri,
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const json::object &content)
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:request
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{
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my_host(),
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string_view{},
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method,
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uri,
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content
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}
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{}
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ircd::m::request::request(const string_view &origin,
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const string_view &destination,
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const string_view &method,
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const string_view &uri,
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const json::object &content)
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{
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json::get<"origin"_>(*this) = origin;
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json::get<"destination"_>(*this) = destination;
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json::get<"method"_>(*this) = method;
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json::get<"uri"_>(*this) = uri;
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json::get<"content"_>(*this) = content;
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}
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ircd::string_view
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ircd::m::request::operator()(const mutable_buffer &out,
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const vector_view<const http::header> &addl_headers)
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const
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{
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const ctx::critical_assertion ca;
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static const size_t headers_max{32};
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thread_local http::header header[headers_max];
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size_t headers{0};
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header[headers++] =
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{
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"User-Agent", info::user_agent
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};
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thread_local char x_matrix[2_KiB];
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if(startswith(at<"uri"_>(*this), "/_matrix/federation"))
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{
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const auto &sk{self::secret_key};
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const auto &pkid{self::public_key_id};
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header[headers++] =
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{
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"Authorization", generate(x_matrix, sk, pkid)
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};
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}
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assert(headers <= headers_max);
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assert(headers + addl_headers.size() <= headers_max);
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for(size_t i(0); i < addl_headers.size() && headers < headers_max; ++i)
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header[headers++] = addl_headers.at(i);
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static const string_view content_type
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{
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"application/json; charset=utf-8"_sv
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};
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const auto content_length
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{
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string_view(json::get<"content"_>(*this)).size()
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};
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window_buffer sb{out};
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http::request
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{
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sb,
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at<"destination"_>(*this),
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at<"method"_>(*this),
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at<"uri"_>(*this),
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content_length,
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content_type,
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{ header, headers }
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};
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return sb.completed();
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}
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ircd::string_view
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ircd::m::request::generate(const mutable_buffer &out,
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const ed25519::sk &sk,
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const string_view &pkid)
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const
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{
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static const size_t request_content_max
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{
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1_MiB
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};
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const ctx::critical_assertion ca;
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thread_local char buf[request_content_max];
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if(unlikely(json::serialized(*this) > sizeof(buf)))
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throw m::error
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{
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"M_REQUEST_TOO_LARGE", "This server generated a request of %zu bytes; limit is %zu",
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json::serialized(*this),
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sizeof(buf)
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};
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const json::object object
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{
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stringify(mutable_buffer{buf}, *this)
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};
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const ed25519::sig sig
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{
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self::secret_key.sign(object)
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};
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const auto &origin
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{
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unquote(string_view{at<"origin"_>(*this)})
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};
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thread_local char sigb64[1_KiB];
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return fmt::sprintf
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{
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out, "X-Matrix origin=%s,key=\"%s\",sig=\"%s\"",
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origin,
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pkid,
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b64encode_unpadded(sigb64, sig)
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};
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}
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bool
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ircd::m::request::verify(const string_view &key,
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const string_view &sig_)
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const
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{
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const ed25519::sig sig
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{
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[&sig_](auto &buf)
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{
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b64decode(buf, sig_);
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}
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};
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const m::node::id::buf node_id
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{
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"", unquote(at<"origin"_>(*this))
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};
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const m::node node
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{
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node_id
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};
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bool verified{false};
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node.key(key, [this, &verified, &sig]
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(const ed25519::pk &pk)
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{
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verified = verify(pk, sig);
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});
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return verified;
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}
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bool
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ircd::m::request::verify(const ed25519::pk &pk,
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const ed25519::sig &sig)
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const
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{
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static const size_t request_max
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{
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1_MiB
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};
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// Matrix spec sez that an empty content object {} is excluded entirely
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// from the verification. Our JSON only excludes members if they evaluate
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// to undefined i.e json::object{}/string_view{} but not json::object{"{}"}
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// or even json::object{""}; rather than burdening the caller with ensuring
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// their assignment conforms perfectly, we ensure correctness manually.
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auto _this(*this);
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if(empty(json::get<"content"_>(*this)))
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json::get<"content"_>(_this) = json::object{};
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const size_t request_size
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{
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json::serialized(_this)
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};
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const ctx::critical_assertion ca;
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thread_local char buf[request_max];
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if(unlikely(request_size > sizeof(buf)))
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throw m::error
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{
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http::PAYLOAD_TOO_LARGE, "M_REQUEST_TOO_LARGE",
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"The request size %zu bytes exceeds maximum of %zu bytes",
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request_size,
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request_max
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};
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const json::object object
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{
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stringify(mutable_buffer{buf}, _this)
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};
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return verify(pk, sig, object);
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}
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bool
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ircd::m::request::verify(const ed25519::pk &pk,
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const ed25519::sig &sig,
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const json::object &object)
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{
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return pk.verify(object, sig);
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}
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//
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// x_matrix
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//
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ircd::m::request::x_matrix::x_matrix(const string_view &input)
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{
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string_view tokens[3];
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if(ircd::tokens(split(input, ' ').second, ',', tokens) != 3)
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throw std::out_of_range{"The x_matrix header is malformed"};
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for(const auto &token : tokens)
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{
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const auto &kv{split(token, '=')};
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const auto &val{unquote(kv.second)};
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switch(hash(kv.first))
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{
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case hash("origin"): origin = val; break;
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case hash("key"): key = val; break;
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case hash("sig"): sig = val; break;
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}
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}
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if(empty(origin))
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throw std::out_of_range{"The x_matrix header is missing 'origin='"};
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if(empty(key))
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throw std::out_of_range{"The x_matrix header is missing 'key='"};
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if(empty(sig))
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throw std::out_of_range{"The x_matrix header is missing 'sig='"};
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}
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