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Fix prev events not being hashed and signed during room creation.

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This commit is contained in:
Pim Kunis 2021-08-18 19:04:09 +02:00
parent 1781575e75
commit 7b011123f8
3 changed files with 102 additions and 108 deletions
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73
lib/matrix_server/room_server.ex
View file

@ -74,17 +74,11 @@ defmodule MatrixServer.RoomServer do
# TODO: power_level_content_override, initial_state, invite, invite_3pid
room = Repo.one!(from r in Room, where: r.id == ^room_id)
case create_room_events(room, account, input) do
events when is_list(events) ->
case Repo.transaction(create_room_insert_events(room, events)) do
case Repo.transaction(create_room_insert_events(room, account, input)) do
{:ok, state_set} -> {:reply, {:ok, room_id}, %{state | state_set: state_set}}
{:error, reason} -> {:reply, {:error, reason}, state}
_ -> {:reply, {:error, :unknown}, state}
end
:error ->
{:reply, {:error, :event_creation}, state}
end
end
def handle_call({:server_in_room, domain}, _from, %{state_set: state_set} = state) do
@ -100,35 +94,35 @@ defmodule MatrixServer.RoomServer do
{:reply, result, state}
end
defp create_room_events(room, account, %CreateRoom{
defp create_room_insert_events(room, account, %CreateRoom{
room_version: room_version,
preset: preset,
name: name,
topic: topic,
preset: preset
topic: topic
}) do
with {:ok, create_room} <- Event.create_room(room, account, room_version),
{:ok, join_creator} <- Event.join(room, account, [create_room]),
{:ok, pls} <- Event.power_levels(room, account, [create_room, join_creator]),
auth_events <- [create_room, join_creator, pls],
{:ok, preset_events} <- room_creation_preset(account, preset, room, auth_events),
{:ok, name_event} <-
if(name, do: Event.name(room, account, name, auth_events), else: {:ok, nil}),
{:ok, topic_event} <-
if(topic, do: Event.topic(room, account, topic, auth_events), else: {:ok, nil}) do
events = [create_room, join_creator, pls] ++ preset_events ++ [name_event, topic_event]
Enum.reject(events, &Kernel.is_nil/1)
else
_ -> :error
end
end
defp create_room_insert_events(room, events) do
fn ->
state_set = %{}
with create_room <- Event.create_room(room, account, room_version),
{:ok, state_set, create_room, room} <-
verify_and_insert_event(create_room, state_set, room),
join_creator <- Event.join(room, account, [create_room]),
{:ok, state_set, join_creator, room} <-
verify_and_insert_event(join_creator, state_set, room),
pls <- Event.power_levels(room, account, [create_room, join_creator]),
{:ok, state_set, pls, room} <- verify_and_insert_event(pls, state_set, room) do
auth_events = [create_room, join_creator, pls]
preset_events = room_creation_preset(account, preset, room, auth_events)
name_event = if name, do: Event.name(room, account, name, auth_events)
topic_event = if topic, do: Event.topic(room, account, topic, auth_events)
remaining_events =
Enum.reject(preset_events ++ [name_event, topic_event], &Kernel.is_nil/1)
result =
Enum.reduce_while(events, {%{}, room}, fn event, {state_set, room} ->
Enum.reduce_while(remaining_events, {state_set, room}, fn event, {state_set, room} ->
case verify_and_insert_event(event, state_set, room) do
{:ok, state_set, room} -> {:cont, {state_set, room}}
{:ok, state_set, _event, room} -> {:cont, {state_set, room}}
{:error, reason} -> {:halt, {:error, reason}}
end
end)
@ -146,6 +140,9 @@ defmodule MatrixServer.RoomServer do
Repo.update!(change(room, state: serialized_state_set))
state_set
end
else
_ -> Repo.rollback(:event_creation)
end
end
end
@ -169,11 +166,11 @@ defmodule MatrixServer.RoomServer do
"public_chat" -> {"public", "shared", "forbidden"}
end
with {:ok, join_rules} <- Event.join_rules(room, account, join_rule, auth_events),
{:ok, his_vis} <- Event.history_visibility(room, account, his_vis, auth_events),
{:ok, guest_access} <- Event.guest_access(room, account, guest_access, auth_events) do
{:ok, [join_rules, his_vis, guest_access]}
end
[
Event.join_rules(room, account, join_rule, auth_events),
Event.history_visibility(room, account, his_vis, auth_events),
Event.guest_access(room, account, guest_access, auth_events)
]
end
defp verify_and_insert_event(
@ -181,6 +178,7 @@ defmodule MatrixServer.RoomServer do
current_state_set,
%Room{forward_extremities: forward_extremities} = room
) do
# TODO: Correct error values.
# Check the following things:
# 1. TODO: Is a valid event, otherwise it is dropped.
# 2. TODO: Passes signature checks, otherwise it is dropped.
@ -190,7 +188,8 @@ defmodule MatrixServer.RoomServer do
# 6. Passes authorization rules based on the current state of the room, otherwise it is "soft failed".
event = %Event{event | prev_events: forward_extremities}
with true <- Event.prevalidate(event),
with {:ok, event} <- Event.post_process(event),
true <- Event.prevalidate(event),
true <- Authorization.authorized_by_auth_events?(event),
state_set <- StateResolution.resolve(event, false),
true <- Authorization.authorized?(event, state_set),
@ -198,7 +197,7 @@ defmodule MatrixServer.RoomServer do
room = Room.update_forward_extremities(event, room)
event = Repo.insert!(event)
state_set = StateResolution.resolve_forward_extremities(event)
{:ok, state_set, room}
{:ok, state_set, event, room}
else
_ -> {:error, :authorization}
end

90
lib/matrix_server/schema/event.ex
View file

@ -14,11 +14,10 @@ defmodule MatrixServer.Event do
field :content, :map
field :prev_events, {:array, :string}
field :auth_events, {:array, :string}
# TODO: make these database fields eventually?
field :signing_keys, :map, virtual: true, default: %{}
field :unsigned, :map, virtual: true, default: %{}
field :signatures, :map, virtual: true, default: %{}
field :hashes, :map, virtual: true, default: %{}
field :unsigned, :map
field :signatures, {:map, {:map, :string}}
field :hashes, {:map, :string}
belongs_to :room, Room, type: :string
end
@ -35,12 +34,11 @@ defmodule MatrixServer.Event do
def create_room(
room,
%Account{localpart: localpart} = creator,
room_version,
generate_id \\ true
room_version
) do
mxid = MatrixServer.get_mxid(localpart)
event = %Event{
%Event{
new(room, creator)
| type: "m.room.create",
state_key: "",
@ -49,14 +47,12 @@ defmodule MatrixServer.Event do
"room_version" => room_version || MatrixServer.default_room_version()
}
}
if generate_id, do: set_event_id(event), else: event
end
def join(room, %Account{localpart: localpart} = sender, auth_events, generate_id \\ true) do
def join(room, %Account{localpart: localpart} = sender, auth_events) do
mxid = MatrixServer.get_mxid(localpart)
event = %Event{
%Event{
new(room, sender)
| type: "m.room.member",
state_key: mxid,
@ -65,19 +61,16 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def power_levels(
room,
%Account{localpart: localpart} = sender,
auth_events,
generate_id \\ true
auth_events
) do
mxid = MatrixServer.get_mxid(localpart)
event = %Event{
%Event{
new(room, sender)
| type: "m.room.power_levels",
state_key: "",
@ -99,12 +92,10 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def name(room, sender, name, auth_events, generate_id \\ true) do
event = %Event{
def name(room, sender, name, auth_events) do
%Event{
new(room, sender)
| type: "m.room.name",
state_key: "",
@ -113,12 +104,10 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def topic(room, sender, topic, auth_events, generate_id \\ true) do
event = %Event{
def topic(room, sender, topic, auth_events) do
%Event{
new(room, sender)
| type: "m.room.topic",
state_key: "",
@ -127,12 +116,10 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def join_rules(room, sender, join_rule, auth_events, generate_id \\ true) do
event = %Event{
def join_rules(room, sender, join_rule, auth_events) do
%Event{
new(room, sender)
| type: "m.room.join_rules",
state_key: "",
@ -141,12 +128,10 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def history_visibility(room, sender, history_visibility, auth_events, generate_id \\ true) do
event = %Event{
def history_visibility(room, sender, history_visibility, auth_events) do
%Event{
new(room, sender)
| type: "m.room.history_visibility",
state_key: "",
@ -155,12 +140,10 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def guest_access(room, sender, guest_access, auth_events, generate_id \\ true) do
event = %Event{
def guest_access(room, sender, guest_access, auth_events) do
%Event{
new(room, sender)
| type: "m.room.guest_access",
state_key: "",
@ -169,8 +152,6 @@ defmodule MatrixServer.Event do
},
auth_events: Enum.map(auth_events, & &1.event_id)
}
if generate_id, do: set_event_id(event), else: event
end
def is_control_event(%Event{type: "m.room.power_levels", state_key: ""}), do: true
@ -294,28 +275,15 @@ defmodule MatrixServer.Event do
end)
end
def sign(event) do
content_hash =
event
|> calculate_content_hash()
|> MatrixServer.encode_unpadded_base64()
event
|> Map.put(:hashes, %{"sha256" => content_hash})
|> redact()
|> KeyServer.sign_object()
end
defp calculate_content_hash(event) do
m =
event
|> MatrixServer.to_serializable_map()
|> Map.drop([:unsigned, :signature, :hashes])
|> EncodableMap.from_map()
|> Jason.encode()
with {:ok, json} <- Jason.encode(m) do
:crypto.hash(:sha256, json)
{:ok, :crypto.hash(:sha256, json)}
end
end
@ -367,6 +335,22 @@ defmodule MatrixServer.Event do
defp redact_content(_, _), do: %{}
# Adds content hash, adds signature and calculates event id.
def post_process(event) do
with {:ok, content_hash} <- calculate_content_hash(event) do
encoded_hash = MatrixServer.encode_unpadded_base64(content_hash)
event = %Event{event | hashes: %{"sha256" => encoded_hash}}
with {:ok, sig, key_id} <- KeyServer.sign_object(redact(event)) do
event = %Event{event | signatures: %{MatrixServer.server_name() => %{key_id => sig}}}
with {:ok, event} <- set_event_id(event) do
{:ok, event}
end
end
end
end
def set_event_id(event) do
with {:ok, event_id} <- generate_event_id(event) do
{:ok, %Event{event | event_id: event_id}}

11
priv/repo/migrations/20210818133912_add_fields_to_events.exs Normal file
View file

@ -0,0 +1,11 @@
defmodule MatrixServer.Repo.Migrations.AddFieldsToEvents do
use Ecto.Migration
def change do
alter table(:events) do
add :unsigned, :map, default: %{}, null: true
add :hashes, :map, null: false
add :signatures, :map, null: false
end
end
end