Merge branch 'fix/oauth-http-basic' into 'develop'

Make OAuth token endpoint work with HTTP Basic auth

See merge request pleroma/pleroma!191

lib/pleroma/web/oauth/oauth_controller.ex

@@ -56,12 +56,7 @@ def create_authorization(conn, %{
   # TODO
   # - proper scope handling
   def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
-    with %App{} = app <-
-           Repo.get_by(
-             App,
-             client_id: params["client_id"],
-             client_secret: params["client_secret"]
-           ),
+    with %App{} = app <- get_app_from_request(conn, params),
          fixed_token = fix_padding(params["code"]),
          %Authorization{} = auth <-
            Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
@@ -76,7 +71,9 @@ def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
 
       json(conn, response)
     else
-      _error -> json(conn, %{error: "Invalid credentials"})
+      _error ->
+        put_status(conn, 400)
+        |> json(%{error: "Invalid credentials"})
     end
   end
 
@@ -86,12 +83,7 @@ def token_exchange(
         conn,
         %{"grant_type" => "password", "name" => name, "password" => password} = params
       ) do
-    with %App{} = app <-
-           Repo.get_by(
-             App,
-             client_id: params["client_id"],
-             client_secret: params["client_secret"]
-           ),
+    with %App{} = app <- get_app_from_request(conn, params),
          %User{} = user <- User.get_cached_by_nickname(name),
          true <- Pbkdf2.checkpw(password, user.password_hash),
          {:ok, auth} <- Authorization.create_authorization(app, user),
@@ -106,7 +98,9 @@ def token_exchange(
 
       json(conn, response)
     else
-      _error -> json(conn, %{error: "Invalid credentials"})
+      _error ->
+        put_status(conn, 400)
+        |> json(%{error: "Invalid credentials"})
     end
   end
 
@@ -115,4 +109,28 @@ defp fix_padding(token) do
     |> Base.url_decode64!(padding: false)
     |> Base.url_encode64()
   end
+
+  defp get_app_from_request(conn, params) do
+    # Per RFC 6749, HTTP Basic is preferred to body params
+    {client_id, client_secret} =
+      with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
+           {:ok, decoded} <- Base.decode64(encoded),
+           [id, secret] <-
+             String.split(decoded, ":")
+             |> Enum.map(fn s -> URI.decode_www_form(s) end) do
+        {id, secret}
+      else
+        _ -> {params["client_id"], params["client_secret"]}
+      end
+
+    if client_id && client_secret do
+      Repo.get_by(
+        App,
+        client_id: client_id,
+        client_secret: client_secret
+      )
+    else
+      nil
+    end
+  end
 end

test/support/factory.ex

@@ -146,4 +146,15 @@ def websub_client_subscription_factory do
       subscribers: []
     }
   end
+
+  def oauth_app_factory do
+    %Pleroma.Web.OAuth.App{
+      client_name: "Some client",
+      redirect_uris: "https://example.com/callback",
+      scopes: "read",
+      website: "https://example.com",
+      client_id: "aaabbb==",
+      client_secret: "aaa;/&bbb"
+    }
+  end
 end

test/web/oauth/oauth_controller_test.exs

@@ -0,0 +1,113 @@
+defmodule Pleroma.Web.OAuth.OAuthControllerTest do
+  use Pleroma.Web.ConnCase
+  import Pleroma.Factory
+
+  alias Pleroma.Repo
+  alias Pleroma.Web.OAuth.{Authorization, Token}
+
+  test "redirects with oauth authorization" do
+    user = insert(:user)
+    app = insert(:oauth_app)
+
+    conn =
+      build_conn()
+      |> post("/oauth/authorize", %{
+        "authorization" => %{
+          "name" => user.nickname,
+          "password" => "test",
+          "client_id" => app.client_id,
+          "redirect_uri" => app.redirect_uris,
+          "state" => "statepassed"
+        }
+      })
+
+    target = redirected_to(conn)
+    assert target =~ app.redirect_uris
+
+    query = URI.parse(target).query |> URI.query_decoder() |> Map.new()
+
+    assert %{"state" => "statepassed", "code" => code} = query
+    assert Repo.get_by(Authorization, token: code)
+  end
+
+  test "issues a token for an all-body request" do
+    user = insert(:user)
+    app = insert(:oauth_app)
+
+    {:ok, auth} = Authorization.create_authorization(app, user)
+
+    conn =
+      build_conn()
+      |> post("/oauth/token", %{
+        "grant_type" => "authorization_code",
+        "code" => auth.token,
+        "redirect_uri" => app.redirect_uris,
+        "client_id" => app.client_id,
+        "client_secret" => app.client_secret
+      })
+
+    assert %{"access_token" => token} = json_response(conn, 200)
+    assert Repo.get_by(Token, token: token)
+  end
+
+  test "issues a token for request with HTTP basic auth client credentials" do
+    user = insert(:user)
+    app = insert(:oauth_app)
+
+    {:ok, auth} = Authorization.create_authorization(app, user)
+
+    app_encoded =
+      (URI.encode_www_form(app.client_id) <> ":" <> URI.encode_www_form(app.client_secret))
+      |> Base.encode64()
+
+    conn =
+      build_conn()
+      |> put_req_header("authorization", "Basic " <> app_encoded)
+      |> post("/oauth/token", %{
+        "grant_type" => "authorization_code",
+        "code" => auth.token,
+        "redirect_uri" => app.redirect_uris
+      })
+
+    assert %{"access_token" => token} = json_response(conn, 200)
+    assert Repo.get_by(Token, token: token)
+  end
+
+  test "rejects token exchange with invalid client credentials" do
+    user = insert(:user)
+    app = insert(:oauth_app)
+
+    {:ok, auth} = Authorization.create_authorization(app, user)
+
+    conn =
+      build_conn()
+      |> put_req_header("authorization", "Basic JTIxOiVGMCU5RiVBNCVCNwo=")
+      |> post("/oauth/token", %{
+        "grant_type" => "authorization_code",
+        "code" => auth.token,
+        "redirect_uri" => app.redirect_uris
+      })
+
+    assert resp = json_response(conn, 400)
+    assert %{"error" => _} = resp
+    refute Map.has_key?(resp, "access_token")
+  end
+
+  test "rejects an invalid authorization code" do
+    app = insert(:oauth_app)
+
+    conn =
+      build_conn()
+      |> post("/oauth/token", %{
+        "grant_type" => "authorization_code",
+        "code" => "Imobviouslyinvalid",
+        "redirect_uri" => app.redirect_uris,
+        "client_id" => app.client_id,
+        "client_secret" => app.client_secret
+      })
+
+    assert resp = json_response(conn, 400)
+    assert %{"error" => _} = json_response(conn, 400)
+    refute Map.has_key?(resp, "access_token")
+  end
+end