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object: move object containment out of transmogrifier into it's own module

This commit is contained in:
William Pitcock 2018-12-01 22:29:41 +00:00
parent 1a360a4eaa
commit e8caecb5c7
5 changed files with 144 additions and 119 deletions
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64
lib/pleroma/object/containment.ex Normal file
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@ -0,0 +1,64 @@
defmodule Pleroma.Object.Containment do
@moduledoc """
# Object Containment
This module contains some useful functions for containing objects to specific
origins and determining those origins. They previously lived in the
ActivityPub `Transmogrifier` module.
Object containment is an important step in validating remote objects to prevent
spoofing, therefore removal of object containment functions is NOT recommended.
"""
require Logger
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
def get_actor(%{"actor" => actor}) when is_list(actor) do
if is_binary(Enum.at(actor, 0)) do
Enum.at(actor, 0)
else
Enum.find(actor, fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
|> Map.get("id")
end
end
def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
id
end
def get_actor(%{"actor" => nil, "attributedTo" => actor}) when not is_nil(actor) do
get_actor(%{"actor" => actor})
end
@doc """
Checks that an imported AP object's actor matches the domain it came from.
"""
def contain_origin(id, %{"actor" => nil}), do: :error
def contain_origin(id, %{"actor" => actor} = params) do
id_uri = URI.parse(id)
actor_uri = URI.parse(get_actor(params))
if id_uri.host == actor_uri.host do
:ok
else
:error
end
end
def contain_origin_from_id(id, %{"id" => nil}), do: :error
def contain_origin_from_id(id, %{"id" => other_id} = params) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
if id_uri.host == other_uri.host do
:ok
else
:error
end
end
end

5
lib/pleroma/web/activity_pub/activity_pub.ex
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@ -1,5 +1,6 @@
defmodule Pleroma.Web.ActivityPub.ActivityPub do
alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
alias Pleroma.Object.Containment
alias Pleroma.Web.ActivityPub.{Transmogrifier, MRF}
alias Pleroma.Web.WebFinger
alias Pleroma.Web.Federator
@ -739,7 +740,7 @@ def fetch_object_from_id(id) do
"actor" => data["actor"] || data["attributedTo"],
"object" => data
},
:ok <- Transmogrifier.contain_origin(id, params),
:ok <- Containment.contain_origin(id, params),
{:ok, activity} <- Transmogrifier.handle_incoming(params) do
{:ok, Object.normalize(activity.data["object"])}
else
@ -773,7 +774,7 @@ def fetch_and_contain_remote_object_from_id(id) do
recv_timeout: 20000
),
{:ok, data} <- Jason.decode(body),
:ok <- Transmogrifier.contain_origin_from_id(id, data) do
:ok <- Containment.contain_origin_from_id(id, data) do
{:ok, data}
else
e ->

71
lib/pleroma/web/activity_pub/transmogrifier.ex
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@ -4,6 +4,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
"""
alias Pleroma.User
alias Pleroma.Object
alias Pleroma.Object.Containment
alias Pleroma.Activity
alias Pleroma.Repo
alias Pleroma.Web.ActivityPub.ActivityPub
@ -13,56 +14,6 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
require Logger
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
def get_actor(%{"actor" => actor}) when is_list(actor) do
if is_binary(Enum.at(actor, 0)) do
Enum.at(actor, 0)
else
Enum.find(actor, fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
|> Map.get("id")
end
end
def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
id
end
def get_actor(%{"actor" => nil, "attributedTo" => actor}) when not is_nil(actor) do
get_actor(%{"actor" => actor})
end
@doc """
Checks that an imported AP object's actor matches the domain it came from.
"""
def contain_origin(id, %{"actor" => nil}), do: :error
def contain_origin(id, %{"actor" => actor} = params) do
id_uri = URI.parse(id)
actor_uri = URI.parse(get_actor(params))
if id_uri.host == actor_uri.host do
:ok
else
:error
end
end
def contain_origin_from_id(id, %{"id" => nil}), do: :error
def contain_origin_from_id(id, %{"id" => other_id} = params) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
if id_uri.host == other_uri.host do
:ok
else
:error
end
end
@doc """
Modifies an incoming AP object (mastodon format) to our internal format.
"""
@ -99,7 +50,7 @@ def fix_addressing(map) do
def fix_actor(%{"attributedTo" => actor} = object) do
object
|> Map.put("actor", get_actor(%{"actor" => actor}))
|> Map.put("actor", Containment.get_actor(%{"actor" => actor}))
end
def fix_likes(%{"likes" => likes} = object)
@ -277,7 +228,7 @@ def handle_incoming(%{"id" => id}) when not (is_binary(id) and length(id) > 8),
# - emoji
def handle_incoming(%{"type" => "Create", "object" => %{"type" => objtype} = object} = data)
when objtype in ["Article", "Note", "Video", "Page"] do
actor = get_actor(data)
actor = Containment.get_actor(data)
data =
Map.put(data, "actor", actor)
@ -360,7 +311,7 @@ defp get_follow_activity(follow_object, followed) do
def handle_incoming(
%{"type" => "Accept", "object" => follow_object, "actor" => actor, "id" => id} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = followed <- User.get_or_fetch_by_ap_id(actor),
{:ok, follow_activity} <- get_follow_activity(follow_object, followed),
{:ok, follow_activity} <- Utils.update_follow_state(follow_activity, "accept"),
@ -386,7 +337,7 @@ def handle_incoming(
def handle_incoming(
%{"type" => "Reject", "object" => follow_object, "actor" => actor, "id" => id} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = followed <- User.get_or_fetch_by_ap_id(actor),
{:ok, follow_activity} <- get_follow_activity(follow_object, followed),
{:ok, follow_activity} <- Utils.update_follow_state(follow_activity, "reject"),
@ -410,7 +361,7 @@ def handle_incoming(
def handle_incoming(
%{"type" => "Like", "object" => object_id, "actor" => actor, "id" => id} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = actor <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
{:ok, activity, _object} <- ActivityPub.like(actor, object, id, false) do
@ -423,7 +374,7 @@ def handle_incoming(
def handle_incoming(
%{"type" => "Announce", "object" => object_id, "actor" => actor, "id" => id} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = actor <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
{:ok, activity, _object} <- ActivityPub.announce(actor, object, id, false) do
@ -477,10 +428,10 @@ def handle_incoming(
) do
object_id = Utils.get_ap_id(object_id)
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = actor <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
:ok <- contain_origin(actor.ap_id, object.data),
:ok <- Containment.contain_origin(actor.ap_id, object.data),
{:ok, activity} <- ActivityPub.delete(object, false) do
{:ok, activity}
else
@ -496,7 +447,7 @@ def handle_incoming(
"id" => id
} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = actor <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
{:ok, activity, _} <- ActivityPub.unannounce(actor, object, id, false) do
@ -566,7 +517,7 @@ def handle_incoming(
"id" => id
} = data
) do
with actor <- get_actor(data),
with actor <- Containment.get_actor(data),
%User{} = actor <- User.get_or_fetch_by_ap_id(actor),
{:ok, object} <- get_obj_helper(object_id) || fetch_obj_helper(object_id),
{:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do

66
test/object/containment_test.exs Normal file
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@ -0,0 +1,66 @@
defmodule Pleroma.Object.ContainmentTest do
use Pleroma.DataCase
alias Pleroma.User
alias Pleroma.Object.Containment
alias Pleroma.Web.ActivityPub.ActivityPub
import Pleroma.Factory
describe "general origin containment" do
test "contain_origin_from_id() catches obvious spoofing attempts" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:error =
Containment.contain_origin_from_id(
"http://example.org/~alyssa/activities/1234.json",
data
)
end
test "contain_origin_from_id() allows alternate IDs within the same origin domain" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:ok =
Containment.contain_origin_from_id(
"http://example.com/~alyssa/activities/1234",
data
)
end
test "contain_origin_from_id() allows matching IDs" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:ok =
Containment.contain_origin_from_id(
"http://example.com/~alyssa/activities/1234.json",
data
)
end
test "users cannot be collided through fake direction spoofing attempts" do
user =
insert(:user, %{
nickname: "rye@niu.moe",
local: false,
ap_id: "https://niu.moe/users/rye",
follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})
})
{:error, _} = User.get_or_fetch_by_ap_id("https://n1u.moe/users/rye")
end
test "all objects with fake directions are rejected by the object fetcher" do
{:error, _} =
ActivityPub.fetch_and_contain_remote_object_from_id(
"https://info.pleroma.site/activity4.json"
)
end
end
end

57
test/web/activity_pub/transmogrifier_test.exs
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@ -945,61 +945,4 @@ test "it rejects activities which reference objects that have an incorrect attri
:error = Transmogrifier.handle_incoming(data)
end
end
describe "general origin containment" do
test "contain_origin_from_id() catches obvious spoofing attempts" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:error =
Transmogrifier.contain_origin_from_id(
"http://example.org/~alyssa/activities/1234.json",
data
)
end
test "contain_origin_from_id() allows alternate IDs within the same origin domain" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:ok =
Transmogrifier.contain_origin_from_id(
"http://example.com/~alyssa/activities/1234",
data
)
end
test "contain_origin_from_id() allows matching IDs" do
data = %{
"id" => "http://example.com/~alyssa/activities/1234.json"
}
:ok =
Transmogrifier.contain_origin_from_id(
"http://example.com/~alyssa/activities/1234.json",
data
)
end
test "users cannot be collided through fake direction spoofing attempts" do
user =
insert(:user, %{
nickname: "rye@niu.moe",
local: false,
ap_id: "https://niu.moe/users/rye",
follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})
})
{:error, _} = User.get_or_fetch_by_ap_id("https://n1u.moe/users/rye")
end
test "all objects with fake directions are rejected by the object fetcher" do
{:error, _} =
ActivityPub.fetch_and_contain_remote_object_from_id(
"https://info.pleroma.site/activity4.json"
)
end
end
end