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Merge branch 'refactor/http-signature-plug' into 'develop' 

http signature plug: separation of concerns

See merge request pleroma/pleroma!1449
develop
kaniini 2019-07-19 16:57:24 +00:00
parent 6561709742 c947cfec5a
commit 716afc83ce
8 changed files with 154 additions and 51 deletions
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51
lib/pleroma/plugs/http_signature.ex
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@ -3,7 +3,6 @@
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
alias Pleroma.Web.ActivityPub.Utils
import Plug.Conn
require Logger
@ -16,38 +15,30 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
end
def call(conn, _opts) do
user = Utils.get_ap_id(conn.params["actor"])
Logger.debug("Checking sig for #{user}")
[signature | _] = get_req_header(conn, "signature")
cond do
signature && String.contains?(signature, user) ->
# set (request-target) header to the appropriate value
# we also replace the digest header with the one we computed
conn =
conn
|> put_req_header(
"(request-target)",
String.downcase("#{conn.method}") <> " #{conn.request_path}"
)
conn =
if conn.assigns[:digest] do
conn
|> put_req_header("digest", conn.assigns[:digest])
else
conn
end
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
signature ->
Logger.debug("Signature not from actor")
assign(conn, :valid_signature, false)
true ->
Logger.debug("No signature header!")
if signature do
# set (request-target) header to the appropriate value
# we also replace the digest header with the one we computed
conn =
conn
|> put_req_header(
"(request-target)",
String.downcase("#{conn.method}") <> " #{conn.request_path}"
)
conn =
if conn.assigns[:digest] do
conn
|> put_req_header("digest", conn.assigns[:digest])
else
conn
end
assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
else
Logger.debug("No signature header!")
conn
end
end
end

70
lib/pleroma/plugs/mapped_signature_to_identity_plug.ex Normal file
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@ -0,0 +1,70 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.MappedSignatureToIdentityPlug do
alias Pleroma.Signature
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Utils
import Plug.Conn
require Logger
def init(options), do: options
defp key_id_from_conn(conn) do
with %{"keyId" => key_id} <- HTTPSignatures.signature_for_conn(conn) do
Signature.key_id_to_actor_id(key_id)
else
_ ->
nil
end
end
defp user_from_key_id(conn) do
with key_actor_id when is_binary(key_actor_id) <- key_id_from_conn(conn),
{:ok, %User{} = user} <- User.get_or_fetch_by_ap_id(key_actor_id) do
user
else
_ ->
nil
end
end
def call(%{assigns: %{user: _}} = conn, _opts), do: conn
# if this has payload make sure it is signed by the same actor that made it
def call(%{assigns: %{valid_signature: true}, params: %{"actor" => actor}} = conn, _opts) do
with actor_id <- Utils.get_ap_id(actor),
{:user, %User{} = user} <- {:user, user_from_key_id(conn)},
{:user_match, true} <- {:user_match, user.ap_id == actor_id} do
assign(conn, :user, user)
else
{:user_match, false} ->
Logger.debug("Failed to map identity from signature (payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
assign(conn, :valid_signature, false)
# remove me once testsuite uses mapped capabilities instead of what we do now
{:user, nil} ->
Logger.debug("Failed to map identity from signature (lookup failure)")
Logger.debug("key_id=#{key_id_from_conn(conn)}, actor=#{actor}")
conn
end
end
# no payload, probably a signed fetch
def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
with %User{} = user <- user_from_key_id(conn) do
assign(conn, :user, user)
else
_ ->
Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
Logger.debug("key_id=#{key_id_from_conn(conn)}")
assign(conn, :valid_signature, false)
end
end
# no signature at all
def call(conn, _opts), do: conn
end

2
lib/pleroma/signature.ex
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@ -9,7 +9,7 @@ defmodule Pleroma.Signature do
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
defp key_id_to_actor_id(key_id) do
def key_id_to_actor_id(key_id) do
URI.parse(key_id)
|> Map.put(:fragment, nil)
|> URI.to_string()

1
lib/pleroma/web/router.ex
View File

@ -617,6 +617,7 @@ defmodule Pleroma.Web.Router do
pipeline :activitypub do
plug(:accepts, ["activity+json", "json"])
plug(Pleroma.Web.Plugs.HTTPSignaturePlug)
plug(Pleroma.Web.Plugs.MappedSignatureToIdentityPlug)
end
scope "/", Pleroma.Web.ActivityPub do

2
mix.exs
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@ -138,7 +138,7 @@ defmodule Pleroma.Mixfile do
ref: "95e8188490e97505c56636c1379ffdf036c1fdde"},
{:http_signatures,
git: "https://git.pleroma.social/pleroma/http_signatures.git",
ref: "a2a5982fa167fb1352fbd518ce6b606ba233a989"},
ref: "293d77bb6f4a67ac8bde1428735c3b42f22cbb30"},
{:pleroma_job_queue, "~> 0.2.0"},
{:telemetry, "~> 0.3"},
{:prometheus_ex, "~> 3.0"},

2
mix.lock
View File

@ -38,7 +38,7 @@
"hackney": {:hex, :hackney, "1.15.1", "9f8f471c844b8ce395f7b6d8398139e26ddca9ebc171a8b91342ee15a19963f4", [:rebar3], [{:certifi, "2.5.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "6.0.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.4", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
"html_entities": {:hex, :html_entities, "0.4.0", "f2fee876858cf6aaa9db608820a3209e45a087c5177332799592142b50e89a6b", [:mix], [], "hexpm"},
"html_sanitize_ex": {:hex, :html_sanitize_ex, "1.3.0", "f005ad692b717691203f940c686208aa3d8ffd9dd4bb3699240096a51fa9564e", [:mix], [{:mochiweb, "~> 2.15", [hex: :mochiweb, repo: "hexpm", optional: false]}], "hexpm"},
"http_signatures": {:git, "https://git.pleroma.social/pleroma/http_signatures.git", "a2a5982fa167fb1352fbd518ce6b606ba233a989", [ref: "a2a5982fa167fb1352fbd518ce6b606ba233a989"]},
"http_signatures": {:git, "https://git.pleroma.social/pleroma/http_signatures.git", "293d77bb6f4a67ac8bde1428735c3b42f22cbb30", [ref: "293d77bb6f4a67ac8bde1428735c3b42f22cbb30"]},
"httpoison": {:hex, :httpoison, "1.2.0", "2702ed3da5fd7a8130fc34b11965c8cfa21ade2f232c00b42d96d4967c39a3a3", [:mix], [{:hackney, "~> 1.8", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
"idna": {:hex, :idna, "6.0.0", "689c46cbcdf3524c44d5f3dde8001f364cd7608a99556d8fbd8239a5798d4c10", [:rebar3], [{:unicode_util_compat, "0.4.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
"jason": {:hex, :jason, "1.1.2", "b03dedea67a99223a2eaf9f1264ce37154564de899fd3d8b9a21b1a6fd64afe7", [:mix], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm"},

18
test/plugs/http_signature_plug_test.exs
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@ -26,22 +26,4 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlugTest do
assert called(HTTPSignatures.validate_conn(:_))
end
end
test "bails out early if the signature isn't by the activity actor" do
params = %{"actor" => "https://mst3k.interlinked.me/users/luciferMysticus"}
conn = build_conn(:get, "/doesntmattter", params)
with_mock HTTPSignatures, validate_conn: fn _ -> false end do
conn =
conn
|> put_req_header(
"signature",
"keyId=\"http://mastodon.example.org/users/admin#main-key"
)
|> HTTPSignaturePlug.call(%{})
assert conn.assigns.valid_signature == false
refute called(HTTPSignatures.validate_conn(:_))
end
end
end

59
test/plugs/mapped_identity_to_signature_plug_test.exs Normal file
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@ -0,0 +1,59 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.MappedSignatureToIdentityPlugTest do
use Pleroma.Web.ConnCase
alias Pleroma.Web.Plugs.MappedSignatureToIdentityPlug
import Tesla.Mock
import Plug.Conn
setup do
mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
:ok
end
defp set_signature(conn, key_id) do
conn
|> put_req_header("signature", "keyId=\"#{key_id}\"")
|> assign(:valid_signature, true)
end
test "it successfully maps a valid identity with a valid signature" do
conn =
build_conn(:get, "/doesntmattter")
|> set_signature("http://mastodon.example.org/users/admin")
|> MappedSignatureToIdentityPlug.call(%{})
refute is_nil(conn.assigns.user)
end
test "it successfully maps a valid identity with a valid signature with payload" do
conn =
build_conn(:post, "/doesntmattter", %{"actor" => "http://mastodon.example.org/users/admin"})
|> set_signature("http://mastodon.example.org/users/admin")
|> MappedSignatureToIdentityPlug.call(%{})
refute is_nil(conn.assigns.user)
end
test "it considers a mapped identity to be invalid when it mismatches a payload" do
conn =
build_conn(:post, "/doesntmattter", %{"actor" => "http://mastodon.example.org/users/admin"})
|> set_signature("https://niu.moe/users/rye")
|> MappedSignatureToIdentityPlug.call(%{})
assert %{valid_signature: false} == conn.assigns
end
@tag skip: "known breakage; the testsuite presently depends on it"
test "it considers a mapped identity to be invalid when the identity cannot be found" do
conn =
build_conn(:post, "/doesntmattter", %{"actor" => "http://mastodon.example.org/users/admin"})
|> set_signature("http://niu.moe/users/rye")
|> MappedSignatureToIdentityPlug.call(%{})
assert %{valid_signature: false} == conn.assigns
end
end