Merge branch 'feature/openldap-support' into 'develop'

OpenLDAP support

Closes #203

See merge request pleroma/pleroma!859

3 files changed, 154 insertions, 6 deletions

diff --git a/lib/pleroma/web/auth/ldap_authenticator.ex b/lib/pleroma/web/auth/ldap_authenticator.ex
new file mode 100644
index 000000000..88217aab8
--- /dev/null
+++ b/lib/pleroma/web/auth/ldap_authenticator.ex
@@ -0,0 +1,143 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Auth.LDAPAuthenticator do
+  alias Pleroma.User
+
+  require Logger
+
+  @behaviour Pleroma.Web.Auth.Authenticator
+
+  @connection_timeout 10_000
+  @search_timeout 10_000
+
+  def get_user(%Plug.Conn{} = conn) do
+    if Pleroma.Config.get([:ldap, :enabled]) do
+      {name, password} =
+        case conn.params do
+          %{"authorization" => %{"name" => name, "password" => password}} ->
+            {name, password}
+
+          %{"grant_type" => "password", "username" => name, "password" => password} ->
+            {name, password}
+        end
+
+      case ldap_user(name, password) do
+        %User{} = user ->
+          {:ok, user}
+
+        {:error, {:ldap_connection_error, _}} ->
+          # When LDAP is unavailable, try default authenticator
+          Pleroma.Web.Auth.PleromaAuthenticator.get_user(conn)
+
+        error ->
+          error
+      end
+    else
+      # Fall back to default authenticator
+      Pleroma.Web.Auth.PleromaAuthenticator.get_user(conn)
+    end
+  end
+
+  def handle_error(%Plug.Conn{} = _conn, error) do
+    error
+  end
+
+  def auth_template, do: nil
+
+  defp ldap_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
+          if Keyword.get(ldap, :tls, false) do
+            :application.ensure_all_started(:ssl)
+
+            case :eldap.start_tls(
+                   connection,
+                   Keyword.get(ldap, :tlsopts, []),
+                   @connection_timeout
+                 ) do
+              :ok ->
+                :ok
+
+              error ->
+                Logger.error("Could not start TLS: #{inspect(error)}")
+            end
+          end
+
+          bind_user(connection, ldap, name, password)
+        after
+          :eldap.close(connection)
+        end
+
+      {:error, error} ->
+        Logger.error("Could not open LDAP connection: #{inspect(error)}")
+        {:error, {:ldap_connection_error, error}}
+    end
+  end
+
+  defp bind_user(connection, ldap, name, password) 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
+  end
+
+  defp 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()},
+           {:attributes, ['mail', 'email']},
+           {: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
+          _ ->
+            Logger.error("Could not find LDAP attribute mail: #{inspect(attributes)}")
+            {:error, :ldap_registration_missing_attributes}
+        end
+
+      error ->
+        error
+    end
+  end
+end
diff --git a/lib/pleroma/web/auth/pleroma_authenticator.ex b/lib/pleroma/web/auth/pleroma_authenticator.ex
index 333446bef..94a19ad49 100644
--- a/lib/pleroma/web/auth/pleroma_authenticator.ex
+++ b/lib/pleroma/web/auth/pleroma_authenticator.ex
@@ -9,7 +9,14 @@ defmodule Pleroma.Web.Auth.PleromaAuthenticator do
   @behaviour Pleroma.Web.Auth.Authenticator
 
   def get_user(%Plug.Conn{} = conn) do
-    %{"authorization" => %{"name" => name, "password" => password}} = conn.params
+    {name, password} =
+      case conn.params do
+        %{"authorization" => %{"name" => name, "password" => password}} ->
+          {name, password}
+
+        %{"grant_type" => "password", "username" => name, "password" => password} ->
+          {name, password}
+      end
 
     with {_, %User{} = user} <- {:user, User.get_by_nickname_or_email(name)},
          {_, true} <- {:checkpw, Pbkdf2.checkpw(password, user.password_hash)} do
diff --git a/lib/pleroma/web/oauth/oauth_controller.ex b/lib/pleroma/web/oauth/oauth_controller.ex
index ec70b7ccc..d69383d40 100644
--- a/lib/pleroma/web/oauth/oauth_controller.ex
+++ b/lib/pleroma/web/oauth/oauth_controller.ex
@@ -5,7 +5,6 @@
 defmodule Pleroma.Web.OAuth.OAuthController do
   use Pleroma.Web, :controller
 
-  alias Comeonin.Pbkdf2
   alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web.Auth.Authenticator
@@ -126,11 +125,10 @@ defmodule Pleroma.Web.OAuth.OAuthController do
 
   def token_exchange(
         conn,
-        %{"grant_type" => "password", "username" => name, "password" => password} = params
+        %{"grant_type" => "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),
+    with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
+         %App{} = app <- get_app_from_request(conn, params),
          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
          scopes <- oauth_scopes(params, app.scopes),
          [] <- scopes -- app.scopes,