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Merge pull request 'Reject unsupported HTTP Message Signatures' (#7918) from activitypub-bot-federation into develop

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Reviewed-on: https://git.pleroma.social/pleroma/pleroma/pulls/7918
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lain 2026-07-26 08:50:16 +00:00
commit d115b41848
3 changed files with 189 additions and 11 deletions
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144
test/pleroma/web/activity_pub/activity_pub_controller_test.exs
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@ -729,6 +729,22 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
assert Activity.get_by_ap_id(data["id"])
end
test "rejects duplicate Signature headers before processing signed inbox requests", %{
conn: conn
} do
data = File.read!("test/fixtures/mastodon-post-activity.json") |> Jason.decode!()
conn =
conn
|> assign_valid_signature_for_actor(data["actor"])
|> put_req_header("content-type", "application/activity+json")
|> Map.update!(:req_headers, &[{"signature", "sig1=:fake-signature:"} | &1])
|> post("/inbox", data)
assert "error, unsupported HTTP Message Signature" == json_response(conn, 401)
assert [] == all_enqueued(worker: ReceiverWorker)
end
test "it inserts an incoming activity into the database" <>
"even if we can't fetch the user but have it in our db",
%{conn: conn} do
@ -757,6 +773,120 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
assert Activity.get_by_ap_id(data["id"])
end
test "rejects unsupported HTTP Message Signatures so clients can fall back", %{conn: conn} do
data = %{
"type" => "Create",
"actor" => "https://activitypubbot.example/user/ok",
"id" => "https://activitypubbot.example/activities/rfc9421-create",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => [],
"object" => %{
"type" => "Note",
"id" => "https://activitypubbot.example/objects/rfc9421-note",
"actor" => "https://activitypubbot.example/user/ok",
"attributedTo" => "https://activitypubbot.example/user/ok",
"content" => "hello from activitypub-bot",
"published" => "2026-05-29T13:33:31Z",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => []
}
}
Mox.expect(Pleroma.StubbedHTTPSignaturesMock, :validate_conn, fn _conn -> false end)
conn =
conn
|> put_req_header("content-type", "application/activity+json")
|> put_req_header("date", "Fri, 29 May 2026 13:33:31 GMT")
|> put_req_header("content-digest", "sha-256=:fake-digest:")
|> put_req_header(
"signature-input",
"sig1=(\"@method\" \"@target-uri\" \"date\" \"content-type\" \"content-digest\");keyid=\"https://activitypubbot.example/user/ok/publickey\";alg=\"rsa-v1_5-sha256\";created=1780061611"
)
|> put_req_header("signature", "sig1=:fake-signature:")
|> post("/inbox", data)
assert "error, unsupported HTTP Message Signature" == json_response(conn, 401)
assert [] == all_enqueued(worker: SignatureRetryWorker)
end
test "rejects duplicate Signature headers so clients can fall back", %{conn: conn} do
data = %{
"type" => "Create",
"actor" => "https://activitypubbot.example/user/ok",
"id" => "https://activitypubbot.example/activities/duplicate-signature-create",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => [],
"object" => %{
"type" => "Note",
"id" => "https://activitypubbot.example/objects/duplicate-signature-note",
"actor" => "https://activitypubbot.example/user/ok",
"attributedTo" => "https://activitypubbot.example/user/ok",
"content" => "hello from activitypub-bot",
"published" => "2026-05-29T13:33:31Z",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => []
}
}
legacy_signature =
"keyId=\"https://activitypubbot.example/user/ok#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest content-type\",signature=\"fake-signature\""
Mox.expect(Pleroma.StubbedHTTPSignaturesMock, :validate_conn, fn _conn -> false end)
conn =
conn
|> put_req_header("content-type", "application/activity+json")
|> put_req_header("date", "Fri, 29 May 2026 13:33:31 GMT")
|> put_req_header("digest", "SHA-256=fake-digest")
|> put_req_header("signature", "sig1=:fake-signature:")
|> Map.update!(:req_headers, &[{"signature", legacy_signature} | &1])
|> post("/inbox", data)
assert "error, unsupported HTTP Message Signature" == json_response(conn, 401)
assert [] == all_enqueued(worker: SignatureRetryWorker)
end
test "keeps failed-signature retry for legacy signatures with Signature-Input", %{conn: conn} do
data = %{
"type" => "Create",
"actor" => "https://activitypubbot.example/user/ok",
"id" => "https://activitypubbot.example/activities/legacy-create",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => [],
"object" => %{
"type" => "Note",
"id" => "https://activitypubbot.example/objects/legacy-note",
"actor" => "https://activitypubbot.example/user/ok",
"attributedTo" => "https://activitypubbot.example/user/ok",
"content" => "hello from activitypub-bot",
"published" => "2026-05-29T13:33:31Z",
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
"cc" => []
}
}
Mox.expect(Pleroma.StubbedHTTPSignaturesMock, :validate_conn, fn _conn -> false end)
conn =
conn
|> put_req_header("content-type", "application/activity+json")
|> put_req_header("date", "Fri, 29 May 2026 13:33:31 GMT")
|> put_req_header("digest", "SHA-256=fake-digest")
|> put_req_header(
"signature-input",
"sig1=(\"@method\" \"@target-uri\" \"date\" \"content-type\" \"digest\");keyid=\"https://activitypubbot.example/user/ok/publickey\";alg=\"rsa-v1_5-sha256\";created=1780061611"
)
|> put_req_header(
"signature",
"keyId=\"https://activitypubbot.example/user/ok#main-key\",algorithm=\"rsa-sha256\",headers=\"(request-target) host date digest content-type\",signature=\"fake-signature\""
)
|> post("/inbox", data)
assert "ok" == json_response(conn, 200)
assert [_] = all_enqueued(worker: SignatureRetryWorker)
end
test "does not create a forged post after failed signature retry", %{conn: conn} do
alice = insert(:user, local: false, ap_id: "https://one.com/users/alice")
bob = insert(:user, local: false, ap_id: "https://two.com/users/bob")
@ -1320,6 +1450,20 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
assert Activity.get_by_ap_id(data["id"])
end
test "rejects duplicate Signature headers", %{conn: conn, data: data} do
user = insert(:user)
conn =
conn
|> assign_valid_signature_for_actor(data["actor"])
|> put_req_header("content-type", "application/activity+json")
|> Map.update!(:req_headers, &[{"signature", "sig1=:fake-signature:"} | &1])
|> post("/users/#{user.nickname}/inbox", data)
assert "error, unsupported HTTP Message Signature" == json_response(conn, 401)
assert [] == all_enqueued(worker: ReceiverWorker)
end
test "it accepts messages with to as string instead of array", %{conn: conn, data: data} do
user = insert(:user)