Add OIDC login

config/config.exs

@@ -30,10 +30,21 @@ config :phoenix, :json_library, Jason
 
 config :logger, truncate: :infinity
 
+config :frenzy, env: config_env()
 config :frenzy, sentry_enabled: false
 config :frenzy, external_readability: false
+config :frenzy, oidc_enabled: false
 
-config :frenzy, env: config_env()
+config :ueberauth, Ueberauth,
+  providers: [
+    oidc:
+      {Ueberauth.Strategy.OIDC,
+       [
+         default: [
+           provider: :default_oidc
+         ]
+       ]}
+  ]
 
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.

lib/frenzy.ex

@@ -10,4 +10,8 @@ defmodule Frenzy do
   def sentry_enabled? do
     Application.get_env(:frenzy, :sentry_enabled)
   end
+
+  def oidc_enabled? do
+    Application.get_env(:frenzy, :oidc_enabled)
+  end
 end

lib/frenzy/application.ex

@@ -20,6 +20,14 @@ defmodule Frenzy.Application do
       {Frenzy.BuiltinExtractor, name: Frenzy.BuiltinExtractor}
     ]
 
+    children =
+      if Frenzy.oidc_enabled?() do
+        children ++
+          [{OpenIDConnect.Worker, Application.get_env(:ueberauth, Ueberauth.Strategy.OIDC)}]
+      else
+        children
+      end
+
     # See https://hexdocs.pm/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Frenzy.Supervisor]

lib/frenzy/user.ex

@@ -8,6 +8,7 @@ defmodule Frenzy.User do
     field :password_hash, :string
     field :fever_password, :string, virtual: true
     field :fever_auth_token, :string
+    field :oidc_subject, :string
 
     has_many :approved_clients, Frenzy.ApprovedClient, on_delete: :delete_all
 
@@ -25,6 +26,7 @@ defmodule Frenzy.User do
           password_hash: String.t(),
           fever_password: String.t() | nil,
           fever_auth_token: String.t(),
+          oidc_subject: String.t() | nil,
           approved_clients: [Frenzy.ApprovedClient.t()] | Ecto.Association.NotLoaded.t(),
           groups: [Frenzy.Group.t()] | Ecto.Association.NotLoaded.t(),
           inserted_at: NaiveDateTime.t(),
@@ -61,6 +63,11 @@ defmodule Frenzy.User do
     |> put_fever_token()
   end
 
+  def set_oidc_subject_changeset(user, attrs) do
+    user
+    |> cast(attrs, [:oidc_subject])
+  end
+
   defp put_password_hash(
          %Ecto.Changeset{valid?: true, changes: %{password: password}} = changeset
        ) do

lib/frenzy_web/controllers/account_controller.ex

@@ -15,7 +15,8 @@ defmodule FrenzyWeb.AccountController do
 
     render(conn, "show.html", %{
       user: user,
-      clients: clients
+      clients: clients,
+      can_link_oidc: Frenzy.oidc_enabled?() && user.oidc_subject in [nil, ""]
     })
   end
 
@@ -147,4 +148,10 @@ defmodule FrenzyWeb.AccountController do
     opml = Frenzy.OPML.Exporter.export(user.groups)
     send_download(conn, {:binary, opml}, filename: "frenzy_export.opml")
   end
+
+  def link_oidc(conn, _params) do
+    conn
+    |> put_session(:continue_path, Routes.account_path(conn, :show))
+    |> redirect(to: Routes.login_path(conn, :ueberauth_request, "oidc"))
+  end
 end

lib/frenzy_web/controllers/login_controller.ex

@@ -3,9 +3,15 @@ defmodule FrenzyWeb.LoginController do
   alias Frenzy.{Repo, User}
   alias FrenzyWeb.Endpoint
 
+  if Frenzy.oidc_enabled?() do
+    plug Ueberauth
+  end
+
   def login(conn, params) do
-    render(conn, "login.html", %{
+    conn
-      continue: Map.get(params, "continue")
+    |> put_session(:continue_path, Map.get(params, "continue"))
+    |> render("login.html", %{
+      oidc_enabled?: Frenzy.oidc_enabled?()
     })
   end
 
@@ -14,16 +20,12 @@ defmodule FrenzyWeb.LoginController do
 
     case Bcrypt.check_pass(user, password) do
       {:ok, user} ->
-        user_token = Phoenix.Token.sign(Endpoint, "user token", user.id)
+        put_user_and_redirect(conn, user)
-        conn = put_session(conn, :user_token, user_token)
-
-        redirect_uri = Map.get(params, "continue") || Routes.group_path(Endpoint, :index)
-        redirect(conn, to: redirect_uri)
 
       {:error, _reason} ->
         conn
         |> put_flash(:error, "Invalid username or password.")
-        |> redirect(to: Routes.login_path(Endpoint, :login))
+        |> redirect(to: Routes.login_path(Endpoint, :login, continue: continue_path(conn)))
     end
   end
 
@@ -33,4 +35,52 @@ defmodule FrenzyWeb.LoginController do
     |> clear_session()
     |> redirect(to: "/")
   end
+
+  def ueberauth_callback(%{assigns: %{ueberauth_failure: _fails}} = conn, _params) do
+    conn
+    |> put_flash(:error, "Failed to authenticate.")
+    |> redirect(to: Routes.login_path(Endpoint, :login, continue: continue_path(conn)))
+  end
+
+  def ueberauth_callback(
+        %{assigns: %{ueberauth_auth: %{credentials: %{other: %{user_info: %{"sub" => subject}}}}}} =
+          conn,
+        _params
+      ) do
+    case Repo.get_by(User, oidc_subject: subject) do
+      nil ->
+        conn = FrenzyWeb.Plug.Authenticate.call(conn, nil)
+
+        case conn.assigns.user do
+          %User{} = user ->
+            changeset = User.set_oidc_subject_changeset(user, %{oidc_subject: subject})
+            {:ok, user} = Repo.update(changeset)
+
+            conn
+            |> put_flash(:info, "Successfully linked OIDC.")
+            |> redirect(to: continue_path(conn))
+
+          _ ->
+            # TODO: register new user for subject
+            conn
+            |> put_flash(:error, "No matching OIDC subject.")
+            |> redirect(to: Routes.login_path(Endpoint, :login, continue: continue_path(conn)))
+        end
+
+      user ->
+        put_user_and_redirect(conn, user)
+    end
+  end
+
+  defp continue_path(conn) do
+    get_session(conn, :continue_path) || Routes.group_path(Endpoint, :index)
+  end
+
+  defp put_user_and_redirect(conn, user) do
+    user_token = Phoenix.Token.sign(Endpoint, "user token", user.id)
+
+    conn
+    |> put_session(:user_token, user_token)
+    |> redirect(to: continue_path(conn))
+  end
 end

lib/frenzy_web/router.ex

@@ -34,6 +34,15 @@ defmodule FrenzyWeb.Router do
     post "/oauth/authorize", Fervor.OauthController, :authorize_post
   end
 
+  scope "/auth", FrenzyWeb do
+    pipe_through :browser
+
+    if Frenzy.oidc_enabled?() do
+      get "/:unused", LoginController, :ueberauth_request
+      get "/:unused/callback", LoginController, :ueberauth_callback
+    end
+  end
+
   scope "/", FrenzyWeb do
     pipe_through :browser
     pipe_through :browser_authenticate
@@ -47,6 +56,10 @@ defmodule FrenzyWeb.Router do
     post "/account/import", AccountController, :import
     post "/account/export", AccountController, :export
 
+    if Frenzy.oidc_enabled?() do
+      get "/account/link_oidc", AccountController, :link_oidc
+    end
+
     get "/", GroupController, :index
     resources "/groups", GroupController
     get "/groups/:id/read", GroupController, :read

lib/frenzy_web/templates/account/show.html.eex

@@ -25,9 +25,13 @@
 <ul class="list-group list-group-flush">
   <li class="list-group-item">
     <a href="<%= Routes.account_path(@conn, :change_password) %>" class="btn btn-secondary">Change Password</a>
-
     <a href="<%= Routes.account_path(@conn, :change_fever_password) %>" class="btn btn-secondary">Change Fever Password</a>
   </li>
+  <%= if @can_link_oidc do %>
+    <li class="list-group-item">
+      <a href="<%= Routes.account_path(@conn, :link_oidc) %>" class="btn btn-secondary">Link OIDC</a>
+    </li>
+  <% end %>
   <li class="list-group-item">
     <h5 class="card-title">Approved Clients</h5>
     <table class="table table-striped">
@@ -56,7 +60,7 @@
            </tr>
          <% end %>
        </tbody>
-    </table> </li>
+    </table>
+  </li>
 </ul>
-
 </section>

lib/frenzy_web/templates/login/login.html.eex

@@ -1,9 +1,6 @@
 <h1>Login</h1>
 
 <%= form_tag Routes.login_path(@conn, :login_post), method: :post do %>
-  <%= if @continue do %>
-    <input type="hidden" name="continue" value="<%= @continue %>">
-  <% end %>
   <div class="row mb-2">
     <label for="username" class="col-sm-2 col-form-label">Username</label>
     <div class="col-sm-10">
@@ -22,3 +19,7 @@
     </div>
   </div>
 <% end %>
+
+<%= if @oidc_enabled? do %>
+  <a href="<%= Routes.login_path(@conn, :ueberauth_request, "oidc") %>">Log In with OIDC</a>
+<% end %>

mix.exs

@@ -57,7 +57,9 @@ defmodule Frenzy.MixProject do
       {:floki, "~> 0.30"},
       {:phoenix_live_view, "~> 0.17.5"},
       {:gemini, git: "https://git.shadowfacts.net/shadowfacts/gemini-ex.git", branch: "main"},
-      {:sentry, "~> 8.0"}
+      {:sentry, "~> 8.0"},
+      {:ueberauth, "~> 0.10"},
+      {:ueberauth_oidc, "~> 0.1"}
     ]
   end
 

mix.lock

@@ -25,13 +25,16 @@
   "hackney": {:hex, :hackney, "1.18.1", "f48bf88f521f2a229fc7bae88cf4f85adc9cd9bcf23b5dc8eb6a1788c662c4f6", [:rebar3], [{:certifi, "~>2.9.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~>6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~>1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~>1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~>1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "a4ecdaff44297e9b5894ae499e9a070ea1888c84afdd1fd9b7b2bc384950128e"},
   "hpax": {:hex, :hpax, "0.1.2", "09a75600d9d8bbd064cdd741f21fc06fc1f4cf3d0fcc335e5aa19be1a7235c84", [:mix], [], "hexpm", "2c87843d5a23f5f16748ebe77969880e29809580efdaccd615cd3bed628a8c13"},
   "html_entities": {:hex, :html_entities, "0.5.2", "9e47e70598da7de2a9ff6af8758399251db6dbb7eebe2b013f2bbd2515895c3c", [:mix], [], "hexpm", "c53ba390403485615623b9531e97696f076ed415e8d8058b1dbaa28181f4fdcc"},
+  "httpoison": {:hex, :httpoison, "1.8.2", "9eb9c63ae289296a544842ef816a85d881d4a31f518a0fec089aaa744beae290", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "2bb350d26972e30c96e2ca74a1aaf8293d61d0742ff17f01e0279fef11599921"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
   "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
+  "jose": {:hex, :jose, "1.11.5", "3bc2d75ffa5e2c941ca93e5696b54978323191988eb8d225c2e663ddfefd515e", [:mix, :rebar3], [], "hexpm", "dcd3b215bafe02ea7c5b23dafd3eb8062a5cd8f2d904fd9caa323d37034ab384"},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
   "mime": {:hex, :mime, "2.0.3", "3676436d3d1f7b81b5a2d2bd8405f412c677558c81b1c92be58c00562bb59095", [:mix], [], "hexpm", "27a30bf0db44d25eecba73755acf4068cbfe26a4372f9eb3e4ea3a45956bff6b"},
   "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm", "f278585650aa581986264638ebf698f8bb19df297f66ad91b18910dfc6e19323"},
   "mint": {:hex, :mint, "1.4.2", "50330223429a6e1260b2ca5415f69b0ab086141bc76dc2fbf34d7c389a6675b2", [:mix], [{:castore, "~> 0.1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "ce75a5bbcc59b4d7d8d70f8b2fc284b1751ffb35c7b6a6302b5192f8ab4ddd80"},
   "mochiweb": {:hex, :mochiweb, "2.18.0", "eb55f1db3e6e960fac4e6db4e2db9ec3602cc9f30b86cd1481d56545c3145d2e", [:rebar3], [], "hexpm"},
+  "openid_connect": {:hex, :openid_connect, "0.2.2", "c05055363330deab39ffd89e609db6b37752f255a93802006d83b45596189c0b", [:mix], [{:httpoison, "~> 1.2", [hex: :httpoison, repo: "hexpm", optional: false]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: false]}, {:jose, "~> 1.8", [hex: :jose, repo: "hexpm", optional: false]}], "hexpm", "735769b6d592124b58edd0582554ce638524c0214cd783d8903d33357d74cc13"},
   "parse_trans": {:hex, :parse_trans, "3.3.1", "16328ab840cc09919bd10dab29e431da3af9e9e7e7e6f0089dd5a2d2820011d8", [:rebar3], [], "hexpm", "07cd9577885f56362d414e8c4c4e6bdf10d43a8767abb92d24cbe8b24c54888b"},
   "phoenix": {:hex, :phoenix, "1.6.12", "f8f8ac077600f84419806dd53114b2e77aedde7a502e74181a7d886355aa0643", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 2.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:phoenix_view, "~> 1.0", [hex: :phoenix_view, repo: "hexpm", optional: false]}, {:plug, "~> 1.10", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.2", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:plug_crypto, "~> 1.2", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2d6cf5583c9c20f7103c40e6014ef802d96553b8e5d6585ad6e627bd5ddb0d12"},
   "phoenix_ecto": {:hex, :phoenix_ecto, "4.4.0", "0672ed4e4808b3fbed494dded89958e22fb882de47a97634c0b13e7b0b5f7720", [:mix], [{:ecto, "~> 3.3", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.14.2 or ~> 3.0", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.9", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "09864e558ed31ee00bd48fcc1d4fc58ae9678c9e81649075431e69dbabb43cc1"},
@@ -56,6 +59,8 @@
   "tesla": {:hex, :tesla, "1.4.4", "bb89aa0c9745190930366f6a2ac612cdf2d0e4d7fff449861baa7875afd797b2", [:mix], [{:castore, "~> 0.1", [hex: :castore, repo: "hexpm", optional: true]}, {:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: true]}, {:finch, "~> 0.3", [hex: :finch, repo: "hexpm", optional: true]}, {:fuse, "~> 2.4", [hex: :fuse, repo: "hexpm", optional: true]}, {:gun, "~> 1.3", [hex: :gun, repo: "hexpm", optional: true]}, {:hackney, "~> 1.6", [hex: :hackney, repo: "hexpm", optional: true]}, {:ibrowse, "4.4.0", [hex: :ibrowse, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: true]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.0", [hex: :mint, repo: "hexpm", optional: true]}, {:poison, ">= 1.0.0", [hex: :poison, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm", "d5503a49f9dec1b287567ea8712d085947e247cb11b06bc54adb05bfde466457"},
   "timex": {:hex, :timex, "3.6.1", "efdf56d0e67a6b956cc57774353b0329c8ab7726766a11547e529357ffdc1d56", [:mix], [{:combine, "~> 0.10", [hex: :combine, repo: "hexpm", optional: false]}, {:gettext, "~> 0.10", [hex: :gettext, repo: "hexpm", optional: false]}, {:tzdata, "~> 0.1.8 or ~> 0.5 or ~> 1.0.0", [hex: :tzdata, repo: "hexpm", optional: false]}], "hexpm", "f354efb2400dd7a80fd9eb6c8419068c4f632da4ac47f3d8822d6e33f08bc852"},
   "tzdata": {:hex, :tzdata, "1.0.1", "f6027a331af7d837471248e62733c6ebee86a72e57c613aa071ebb1f750fc71a", [:mix], [{:hackney, "~> 1.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "cf1345dfbce6acdfd4e23cbb36e96e53d1981bc89181cd0b936f4f398f4c0b78"},
+  "ueberauth": {:hex, :ueberauth, "0.10.5", "806adb703df87e55b5615cf365e809f84c20c68aa8c08ff8a416a5a6644c4b02", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "3efd1f31d490a125c7ed453b926f7c31d78b97b8a854c755f5c40064bf3ac9e1"},
+  "ueberauth_oidc": {:hex, :ueberauth_oidc, "0.1.7", "d610cbe5ef09881dff52126906b130307adcf02791ce158c1847fd50949b283a", [:mix], [{:httpoison, "~> 1.8", [hex: :httpoison, repo: "hexpm", optional: false]}, {:jose, "~> 1.11", [hex: :jose, repo: "hexpm", optional: false]}, {:openid_connect, "~> 0.2.2", [hex: :openid_connect, repo: "hexpm", optional: false]}, {:plug, "~> 1.11", [hex: :plug, repo: "hexpm", optional: false]}, {:ueberauth, "~> 0.7", [hex: :ueberauth, repo: "hexpm", optional: false]}], "hexpm", "34d612f66a5425af4142d6c9dece887c60188c31e1dc113e5ee8cecdc6c5e8a9"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
   "xml_builder": {:hex, :xml_builder, "2.1.1", "2d6d665f09cf1319e3e1c46035755271b414d99ad8615d0bd6f337623e0c885b", [:mix], [], "hexpm", "214c16caa77e66bf0c6b74099a7059ee00de8fd07728d2a3dc32afe344a7452b"},
 }

priv/repo/migrations/20230625214304_user_add_oidc_subject.exs

@@ -0,0 +1,9 @@
+defmodule Frenzy.Repo.Migrations.UserAddOidcSubject do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add :oidc_subject, :string, default: nil
+    end
+  end
+end