OpenLDAP support

2 files changed, 109 insertions, 2 deletions

diff --git a/lib/pleroma/ldap.ex b/lib/pleroma/ldap.ex
new file mode 100644
index 000000000..282d8e553
--- /dev/null
+++ b/lib/pleroma/ldap.ex
@@ -0,0 +1,84 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.LDAP do
+  alias Pleroma.User
+
+  require Logger
+
+  @connection_timeout 10_000
+  @search_timeout 10_000
+
+  def get_user(name, password) do
+    ldap = Pleroma.Config.get(:ldap, [])
+    host = Keyword.get(ldap, :host, "localhost")
+    port = Keyword.get(ldap, :port, 389)
+    ssl = Keyword.get(ldap, :ssl, false)
+    sslopts = Keyword.get(ldap, :sslopts, [])
+
+    options =
+      [{:port, port}, {:ssl, ssl}, {:timeout, @connection_timeout}] ++
+        if sslopts != [], do: [{:sslopts, sslopts}], else: []
+
+    case :eldap.open([to_charlist(host)], options) do
+      {:ok, connection} ->
+        try do
+          uid = Keyword.get(ldap, :uid, "cn")
+          base = Keyword.get(ldap, :base)
+
+          case :eldap.simple_bind(connection, "#{uid}=#{name},#{base}", password) do
+            :ok ->
+              case User.get_by_nickname_or_email(name) do
+                %User{} = user ->
+                  user
+
+                _ ->
+                  register_user(connection, base, uid, name, password)
+              end
+
+            error ->
+              error
+          end
+        after
+          :eldap.close(connection)
+        end
+
+      {:error, error} ->
+        Logger.error("Could not open LDAP connection: #{inspect(error)}")
+        {:error, {:ldap_connection_error, error}}
+    end
+  end
+
+  def register_user(connection, base, uid, name, password) do
+    case :eldap.search(connection, [
+           {:base, to_charlist(base)},
+           {:filter, :eldap.equalityMatch(to_charlist(uid), to_charlist(name))},
+           {:scope, :eldap.wholeSubtree()},
+           {:timeout, @search_timeout}
+         ]) do
+      {:ok, {:eldap_search_result, [{:eldap_entry, _, attributes}], _}} ->
+        with {_, [mail]} <- List.keyfind(attributes, 'mail', 0) do
+          params = %{
+            email: :erlang.list_to_binary(mail),
+            name: name,
+            nickname: name,
+            password: password,
+            password_confirmation: password
+          }
+
+          changeset = User.register_changeset(%User{}, params)
+
+          case User.register(changeset) do
+            {:ok, user} -> user
+            error -> error
+          end
+        else
+          _ -> {:error, :ldap_registration_missing_attributes}
+        end
+
+      error ->
+        error
+    end
+  end
+end
diff --git a/lib/pleroma/web/oauth/oauth_controller.ex b/lib/pleroma/web/oauth/oauth_controller.ex
index 7c1a3adbd..654beb2c4 100644
--- a/lib/pleroma/web/oauth/oauth_controller.ex
+++ b/lib/pleroma/web/oauth/oauth_controller.ex
@@ -130,8 +130,7 @@ defmodule Pleroma.Web.OAuth.OAuthController do
         %{"grant_type" => "password", "username" => name, "password" => password} = params
       ) do
     with %App{} = app <- get_app_from_request(conn, params),
-         %User{} = user <- User.get_by_nickname_or_email(name),
-         true <- Pbkdf2.checkpw(password, user.password_hash),
+         %User{} = user <- get_user(name, password),
          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
          scopes <- oauth_scopes(params, app.scopes),
          [] <- scopes -- app.scopes,
@@ -215,4 +214,28 @@ defmodule Pleroma.Web.OAuth.OAuthController do
       nil
     end
   end
+
+  defp get_user(name, password) do
+    if Pleroma.Config.get([:ldap, :enabled]) do
+      case Pleroma.LDAP.get_user(name, password) do
+        %User{} = user ->
+          user
+
+        {:error, {:ldap_connection_error, _}} ->
+          # When LDAP is unavailable, try default login
+          with %User{} = user <- User.get_by_nickname_or_email(name),
+               true <- Pbkdf2.checkpw(password, user.password_hash) do
+            user
+          end
+
+        error ->
+          error
+      end
+    else
+      with %User{} = user <- User.get_by_nickname_or_email(name),
+           true <- Pbkdf2.checkpw(password, user.password_hash) do
+        user
+      end
+    end
+  end
 end