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https://github.com/matrix-construct/construct
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105 lines
3 KiB
C++
105 lines
3 KiB
C++
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 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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namespace ircd::m
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{
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static void auth_room_redaction(const event &, event::auth::hookdata &);
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extern hookfn<event::auth::hookdata &> auth_room_redaction_hookfn;
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}
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ircd::mapi::header
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IRCD_MODULE
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{
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"Matrix m.room.redaction"
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};
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decltype(ircd::m::auth_room_redaction_hookfn)
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ircd::m::auth_room_redaction_hookfn
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{
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auth_room_redaction,
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{
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{ "_site", "event.auth" },
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{ "type", "m.room.redaction" },
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}
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};
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void
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ircd::m::auth_room_redaction(const m::event &event,
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event::auth::hookdata &data)
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{
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using FAIL = event::auth::FAIL;
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// 11. If type is m.room.redaction:
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assert(json::get<"type"_>(event) == "m.room.redaction");
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const m::event::prev prev{event};
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const m::room::power power
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{
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data.auth_power? *data.auth_power : m::event{}, *data.auth_create
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};
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// a. If the sender's power level is greater than or equal to the
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// redact level, allow.
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if(power(at<"sender"_>(event), "redact"))
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{
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data.allow = true;
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return;
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}
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// b. If the domain of the event_id of the event being redacted is the
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// same as the domain of the event_id of the m.room.redaction, allow.
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//
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//if(event::id(json::get<"redacts"_>(event)).host() == user::id(at<"sender"_>(event)).host())
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// return {};
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//
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// In past room versions, redactions were only permitted to enter the
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// DAG if the sender's domain matched the domain in the event ID
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// being redacted, or the sender had appropriate permissions per the
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// power levels. Due to servers now not being able to determine where
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// an event came from during event authorization, redaction events
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// are always accepted (provided the event is allowed by events and
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// events_default in the power levels). However, servers should not
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// apply or send redactions to clients until both the redaction event
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// and original event have been seen, and are valid. Servers should
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// only apply redactions to events where the sender's domains match,
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// or the sender of the redaction has the appropriate permissions per
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// the power levels.
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const auto redact_target_idx
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{
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m::index(at<"redacts"_>(event), std::nothrow)
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};
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const auto sender_domain_match
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{
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[&event](const string_view &tgt)
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{
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return tgt? user::id(tgt).host() == user::id(at<"sender"_>(event)).host(): false;
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}
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};
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if(!redact_target_idx)
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throw FAIL
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{
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"m.room.redaction redacts target is unknown."
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};
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if(m::query(std::nothrow, redact_target_idx, "redacts", sender_domain_match))
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{
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data.allow = true;
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return;
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}
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// c. Otherwise, reject.
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throw FAIL
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{
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"m.room.redaction fails authorization."
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};
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}
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