Merge branch '15529-federated-user-accounts' refs #15529
authorPeter Amstutz <pamstutz@veritasgenetics.com>
Thu, 5 Sep 2019 18:38:20 +0000 (14:38 -0400)
committerPeter Amstutz <pamstutz@veritasgenetics.com>
Thu, 5 Sep 2019 18:38:20 +0000 (14:38 -0400)
Arvados-DCO-1.1-Signed-off-by: Peter Amstutz <pamstutz@veritasgenetics.com>

lib/config/config.default.yml
lib/config/export.go
lib/config/generated_config.go
sdk/go/arvados/config.go
services/api/app/controllers/user_sessions_controller.rb
services/api/app/models/api_client_authorization.rb
services/api/config/arvados_config.rb
services/api/test/functional/user_sessions_controller_test.rb
services/api/test/integration/remote_user_test.rb

index 24b2e450eb8c927388ec5add94299fb931163ccf..c7a038bec6c5da05fbeef993acae2f31ff7197b9 100644 (file)
@@ -413,11 +413,20 @@ Clusters:
         MaxUUIDEntries:       1000
 
     Login:
-      # These settings are provided by your OAuth2 provider (e.g.,
-      # sso-provider).
+      # These settings are provided by your OAuth2 provider (eg
+      # Google) used to perform upstream authentication.
       ProviderAppSecret: ""
       ProviderAppID: ""
 
+      # The cluster ID to delegate the user database.  When set,
+      # logins on this cluster will be redirected to the login cluster
+      # (login cluster must appear in RemoteHosts with Proxy: true)
+      LoginCluster: ""
+
+      # How long a cached token belonging to a remote cluster will
+      # remain valid before it needs to be revalidated.
+      RemoteTokenRefresh: 5m
+
     Git:
       # Path to git or gitolite-shell executable. Each authenticated
       # request will execute this program with the single argument "http-backend"
index 6eb4fbe5f570d4abf9ffd885f1ab0d822acf7fa2..69aae2c624a68ed4fcf5837739e33e3d97fc30e7 100644 (file)
@@ -117,7 +117,11 @@ var whitelist = map[string]bool{
        "InstanceTypes":                                true,
        "InstanceTypes.*":                              true,
        "InstanceTypes.*.*":                            true,
-       "Login":                                        false,
+       "Login":                                        true,
+       "Login.ProviderAppSecret":                      false,
+       "Login.ProviderAppID":                          false,
+       "Login.LoginCluster":                           true,
+       "Login.RemoteTokenRefresh":                     true,
        "Mail":                                         false,
        "ManagementToken":                              false,
        "PostgreSQL":                                   false,
index 8a5b4610c2b9b3ec88dd7029eed52bc7de4ce704..f8a0e097dc7d4e3f9de577d747cd9c0b54a87d0b 100644 (file)
@@ -419,11 +419,20 @@ Clusters:
         MaxUUIDEntries:       1000
 
     Login:
-      # These settings are provided by your OAuth2 provider (e.g.,
-      # sso-provider).
+      # These settings are provided by your OAuth2 provider (eg
+      # Google) used to perform upstream authentication.
       ProviderAppSecret: ""
       ProviderAppID: ""
 
+      # The cluster ID to delegate the user database.  When set,
+      # logins on this cluster will be redirected to the login cluster
+      # (login cluster must appear in RemoteHosts with Proxy: true)
+      LoginCluster: ""
+
+      # How long a cached token belonging to a remote cluster will
+      # remain valid before it needs to be revalidated.
+      RemoteTokenRefresh: 5m
+
     Git:
       # Path to git or gitolite-shell executable. Each authenticated
       # request will execute this program with the single argument "http-backend"
index 5a18972f5232127466a1590c023915deef354935..29dd62ac1eb2ca3f0c224bd08033284451f45c05 100644 (file)
@@ -119,8 +119,10 @@ type Cluster struct {
                Repositories string
        }
        Login struct {
-               ProviderAppSecret string
-               ProviderAppID     string
+               ProviderAppSecret  string
+               ProviderAppID      string
+               LoginCluster       string
+               RemoteTokenRefresh Duration
        }
        Mail struct {
                MailchimpAPIKey                string
index ef0f8868666dfb3bb786dab263270c8911df45e6..49af414310782ba25b55679840329c9fcfe18ead 100644 (file)
@@ -13,6 +13,10 @@ class UserSessionsController < ApplicationController
 
   # omniauth callback method
   def create
+    if !Rails.configuration.Login.LoginCluster.empty? and Rails.configuration.Login.LoginCluster != Rails.configuration.ClusterID
+      raise "Local login disabled when LoginCluster is set"
+    end
+
     omniauth = request.env['omniauth.auth']
 
     identity_url_ok = (omniauth['info']['identity_url'].length > 0) rescue false
@@ -151,13 +155,30 @@ class UserSessionsController < ApplicationController
     end
     p = []
     p << "auth_provider=#{CGI.escape(params[:auth_provider])}" if params[:auth_provider]
-    if params[:return_to]
-      # Encode remote param inside callback's return_to, so that we'll get it on
-      # create() after login.
-      remote_param = params[:remote].nil? ? '' : params[:remote]
-      p << "return_to=#{CGI.escape(remote_param + ',' + params[:return_to])}"
+
+    if !Rails.configuration.Login.LoginCluster.empty? and Rails.configuration.Login.LoginCluster != Rails.configuration.ClusterID
+      host = ApiClientAuthorization.remote_host(uuid_prefix: Rails.configuration.Login.LoginCluster)
+      if not host
+        raise "LoginCluster #{Rails.configuration.Login.LoginCluster} missing from RemoteClusters"
+      end
+      scheme = "https"
+      cluster = Rails.configuration.RemoteClusters[Rails.configuration.Login.LoginCluster]
+      if cluster and cluster['Scheme'] and !cluster['Scheme'].empty?
+        scheme = cluster['Scheme']
+      end
+      login_cluster = "#{scheme}://#{host}"
+      p << "remote=#{CGI.escape(params[:remote])}" if params[:remote]
+      p << "return_to=#{CGI.escape(params[:return_to])}" if params[:return_to]
+      redirect_to "#{login_cluster}/login?#{p.join('&')}"
+    else
+      if params[:return_to]
+        # Encode remote param inside callback's return_to, so that we'll get it on
+        # create() after login.
+        remote_param = params[:remote].nil? ? '' : params[:remote]
+        p << "return_to=#{CGI.escape(remote_param + ',' + params[:return_to])}"
+      end
+      redirect_to "/auth/joshid?#{p.join('&')}"
     end
-    redirect_to "/auth/joshid?#{p.join('&')}"
   end
 
   def send_api_token_to(callback_url, user, remote=nil)
index 7645d1597ca726579dd91ead5285a9f0253c3873..55db16a4b5e3e81fe407263d0dda69cb1dce9c35 100644 (file)
@@ -87,19 +87,33 @@ class ApiClientAuthorization < ArvadosModel
   end
 
   def self.remote_host(uuid_prefix:)
-    (Rails.configuration.RemoteClusters[uuid_prefix].andand.Host) ||
-      (Rails.configuration.RemoteClusters["*"].Proxy &&
+    (Rails.configuration.RemoteClusters[uuid_prefix].andand["Host"]) ||
+      (Rails.configuration.RemoteClusters["*"]["Proxy"] &&
        uuid_prefix+".arvadosapi.com")
   end
 
+  def self.make_http_client
+    clnt = HTTPClient.new
+    if Rails.configuration.TLS.Insecure
+      clnt.ssl_config.verify_mode = OpenSSL::SSL::VERIFY_NONE
+    else
+      # Use system CA certificates
+      ["/etc/ssl/certs/ca-certificates.crt",
+       "/etc/pki/tls/certs/ca-bundle.crt"]
+        .select { |ca_path| File.readable?(ca_path) }
+        .each { |ca_path| clnt.ssl_config.add_trust_ca(ca_path) }
+    end
+    clnt
+  end
+
   def self.validate(token:, remote: nil)
     return nil if !token
     remote ||= Rails.configuration.ClusterID
 
     case token[0..2]
     when 'v2/'
-      _, uuid, secret, optional = token.split('/')
-      unless uuid.andand.length == 27 && secret.andand.length.andand > 0
+      _, token_uuid, secret, optional = token.split('/')
+      unless token_uuid.andand.length == 27 && secret.andand.length.andand > 0
         return nil
       end
 
@@ -108,11 +122,11 @@ class ApiClientAuthorization < ArvadosModel
         # matches expections.
         c = Container.where(uuid: optional).first
         if !c.nil?
-          if !c.auth_uuid.nil? and c.auth_uuid != uuid
+          if !c.auth_uuid.nil? and c.auth_uuid != token_uuid
             # token doesn't match the container's token
             return nil
           end
-          if !c.runtime_token.nil? and "v2/#{uuid}/#{secret}" != c.runtime_token
+          if !c.runtime_token.nil? and "v2/#{token_uuid}/#{secret}" != c.runtime_token
             # token doesn't match the container's token
             return nil
           end
@@ -123,45 +137,45 @@ class ApiClientAuthorization < ArvadosModel
         end
       end
 
+      # fast path: look up the token in the local database
       auth = ApiClientAuthorization.
              includes(:user, :api_client).
-             where('uuid=? and (expires_at is null or expires_at > CURRENT_TIMESTAMP)', uuid).
+             where('uuid=? and (expires_at is null or expires_at > CURRENT_TIMESTAMP)', token_uuid).
              first
       if auth && auth.user &&
          (secret == auth.api_token ||
           secret == OpenSSL::HMAC.hexdigest('sha1', auth.api_token, remote))
+        # found it
         return auth
       end
 
-      uuid_prefix = uuid[0..4]
-      if uuid_prefix == Rails.configuration.ClusterID
-        # If the token were valid, we would have validated it above
+      token_uuid_prefix = token_uuid[0..4]
+      if token_uuid_prefix == Rails.configuration.ClusterID
+        # Token is supposedly issued by local cluster, but if the
+        # token were valid, we would have been found in the database
+        # in the above query.
         return nil
-      elsif uuid_prefix.length != 5
+      elsif token_uuid_prefix.length != 5
         # malformed
         return nil
       end
 
-      host = remote_host(uuid_prefix: uuid_prefix)
+      # Invariant: token_uuid_prefix != Rails.configuration.ClusterID
+      #
+      # In other words the remaing code in this method below is the
+      # case that determines whether to accept a token that was issued
+      # by a remote cluster when the token absent or expired in our
+      # database.  To begin, we need to ask the cluster that issued
+      # the token to [re]validate it.
+      clnt = ApiClientAuthorization.make_http_client
+
+      host = remote_host(uuid_prefix: token_uuid_prefix)
       if !host
-        Rails.logger.warn "remote authentication rejected: no host for #{uuid_prefix.inspect}"
+        Rails.logger.warn "remote authentication rejected: no host for #{token_uuid_prefix.inspect}"
         return nil
       end
 
-      # Token was issued by a different cluster. If it's expired or
-      # missing in our database, ask the originating cluster to
-      # [re]validate it.
       begin
-        clnt = HTTPClient.new
-        if Rails.configuration.TLS.Insecure
-          clnt.ssl_config.verify_mode = OpenSSL::SSL::VERIFY_NONE
-        else
-          # Use system CA certificates
-          ["/etc/ssl/certs/ca-certificates.crt",
-           "/etc/pki/tls/certs/ca-bundle.crt"]
-            .select { |ca_path| File.readable?(ca_path) }
-            .each { |ca_path| clnt.ssl_config.add_trust_ca(ca_path) }
-        end
         remote_user = SafeJSON.load(
           clnt.get_content('https://' + host + '/arvados/v1/users/current',
                            {'remote' => Rails.configuration.ClusterID},
@@ -170,63 +184,91 @@ class ApiClientAuthorization < ArvadosModel
         Rails.logger.warn "remote authentication with token #{token.inspect} failed: #{e}"
         return nil
       end
-      if !remote_user.is_a?(Hash) || !remote_user['uuid'].is_a?(String) || remote_user['uuid'][0..4] != uuid[0..4]
+
+      # Check the response is well formed.
+      if !remote_user.is_a?(Hash) || !remote_user['uuid'].is_a?(String)
         Rails.logger.warn "remote authentication rejected: remote_user=#{remote_user.inspect}"
         return nil
       end
-      act_as_system_user do
-        # Add/update user and token in our database so we can
-        # validate subsequent requests faster.
-
-        user = User.find_or_create_by(uuid: remote_user['uuid']) do |user|
-          # (this block runs for the "create" case, not for "find")
-          user.is_admin = false
-          user.email = remote_user['email']
-          if remote_user['username'].andand.length.andand > 0
-            user.set_initial_username(requested: remote_user['username'])
-          end
-        end
 
+      remote_user_prefix = remote_user['uuid'][0..4]
+
+      # Clusters can only authenticate for their own users.
+      if remote_user_prefix != token_uuid_prefix
+        Rails.logger.warn "remote authentication rejected: claimed remote user #{remote_user_prefix} but token was issued by #{token_uuid_prefix}"
+        return nil
+      end
+
+      # Invariant:    remote_user_prefix == token_uuid_prefix
+      # therefore:    remote_user_prefix != Rails.configuration.ClusterID
+
+      # Add or update user and token in local database so we can
+      # validate subsequent requests faster.
+
+      user = User.find_by_uuid(remote_user['uuid'])
+
+      if !user
+        # Create a new record for this user.
+        user = User.new(uuid: remote_user['uuid'],
+                        is_active: false,
+                        is_admin: false,
+                        email: remote_user['email'],
+                        owner_uuid: system_user_uuid)
+        user.set_initial_username(requested: remote_user['username'])
+      end
+
+      # Sync user record.
+      if remote_user_prefix == Rails.configuration.Login.LoginCluster
+        # Remote cluster controls our user database, copy both
+        # 'is_active' and 'is_admin'
+        user.is_active = remote_user['is_active']
+        user.is_admin = remote_user['is_admin']
+      else
         if Rails.configuration.Users.NewUsersAreActive ||
-           Rails.configuration.RemoteClusters[remote_user['uuid'][0..4]].andand["ActivateUsers"]
-          # Update is_active to whatever it is at the remote end
+           Rails.configuration.RemoteClusters[remote_user_prefix].andand["ActivateUsers"]
+          # Default policy is to activate users, so match activate
+          # with the remote record.
           user.is_active = remote_user['is_active']
         elsif !remote_user['is_active']
-          # Remote user is inactive; our mirror should be, too.
+          # Deactivate user if the remote is inactive, otherwise don't
+          # change 'is_active'.
           user.is_active = false
         end
+      end
 
-        %w[first_name last_name email prefs].each do |attr|
-          user.send(attr+'=', remote_user[attr])
-        end
+      %w[first_name last_name email prefs].each do |attr|
+        user.send(attr+'=', remote_user[attr])
+      end
 
+      act_as_system_user do
         user.save!
 
-        auth = ApiClientAuthorization.find_or_create_by(uuid: uuid) do |auth|
+        # We will accept this token (and avoid reloading the user
+        # record) for 'RemoteTokenRefresh' (default 5 minutes).
+        # Possible todo:
+        # Request the actual api_client_auth record from the remote
+        # server in case it wants the token to expire sooner.
+        auth = ApiClientAuthorization.find_or_create_by(uuid: token_uuid) do |auth|
           auth.user = user
-          auth.api_token = secret
           auth.api_client_id = 0
         end
-
-        # Accept this token (and don't reload the user record) for
-        # 5 minutes. TODO: Request the actual api_client_auth
-        # record from the remote server in case it wants the token
-        # to expire sooner.
         auth.update_attributes!(user: user,
                                 api_token: secret,
                                 api_client_id: 0,
-                                expires_at: Time.now + 5.minutes)
+                                expires_at: Time.now + Rails.configuration.Login.RemoteTokenRefresh)
       end
       return auth
     else
+      # token is not a 'v2' token
       auth = ApiClientAuthorization.
-             includes(:user, :api_client).
-             where('api_token=? and (expires_at is null or expires_at > CURRENT_TIMESTAMP)', token).
-             first
+               includes(:user, :api_client).
+               where('api_token=? and (expires_at is null or expires_at > CURRENT_TIMESTAMP)', token).
+               first
       if auth && auth.user
         return auth
       end
     end
+
     return nil
   end
 
index 09e54b9d4f4037656d76f5749e8ce959aed2848d..5546e8e406de5ec5c3c44e9ab889786391bcd4c1 100644 (file)
@@ -107,6 +107,8 @@ arvcfg.declare_config "Users.NewUserNotificationRecipients", Hash, :new_user_not
 arvcfg.declare_config "Users.NewInactiveUserNotificationRecipients", Hash, :new_inactive_user_notification_recipients, method(:arrayToHash)
 arvcfg.declare_config "Login.ProviderAppSecret", NonemptyString, :sso_app_secret
 arvcfg.declare_config "Login.ProviderAppID", NonemptyString, :sso_app_id
+arvcfg.declare_config "Login.LoginCluster", String
+arvcfg.declare_config "Login.RemoteTokenRefresh", ActiveSupport::Duration
 arvcfg.declare_config "TLS.Insecure", Boolean, :sso_insecure
 arvcfg.declare_config "Services.SSO.ExternalURL", NonemptyString, :sso_provider_url
 arvcfg.declare_config "AuditLogs.MaxAge", ActiveSupport::Duration, :max_audit_log_age
index cee8245b25120192bd198115cba374a2232ab4b6..d96ccb0903fc72026297a412ac474a8ac895af04 100644 (file)
@@ -6,7 +6,16 @@ require 'test_helper'
 
 class UserSessionsControllerTest < ActionController::TestCase
 
-  test "new user from new api client" do
+  test "redirect to joshid" do
+    api_client_page = 'http://client.example.com/home'
+    get :login, params: {return_to: api_client_page}
+    assert_response :redirect
+    assert_equal("http://test.host/auth/joshid?return_to=%2Chttp%3A%2F%2Fclient.example.com%2Fhome", @response.redirect_url)
+    assert_nil assigns(:api_client)
+  end
+
+
+  test "send token when user is already logged in" do
     authorize_with :inactive
     api_client_page = 'http://client.example.com/home'
     get :login, params: {return_to: api_client_page}
@@ -35,4 +44,24 @@ class UserSessionsControllerTest < ActionController::TestCase
     get :login, params: {return_to: api_client_page, remote: remote_prefix}
     assert_response 400
   end
+
+  test "login to LoginCluster" do
+    Rails.configuration.Login.LoginCluster = 'zbbbb'
+    Rails.configuration.RemoteClusters['zbbbb'] = {'Host' => 'zbbbb.example.com'}
+    api_client_page = 'http://client.example.com/home'
+    get :login, params: {return_to: api_client_page}
+    assert_response :redirect
+    assert_equal("https://zbbbb.example.com/login?return_to=http%3A%2F%2Fclient.example.com%2Fhome", @response.redirect_url)
+    assert_nil assigns(:api_client)
+  end
+
+  test "don't go into redirect loop if LoginCluster is self" do
+    Rails.configuration.Login.LoginCluster = 'zzzzz'
+    api_client_page = 'http://client.example.com/home'
+    get :login, params: {return_to: api_client_page}
+    assert_response :redirect
+    assert_equal("http://test.host/auth/joshid?return_to=%2Chttp%3A%2F%2Fclient.example.com%2Fhome", @response.redirect_url)
+    assert_nil assigns(:api_client)
+  end
+
 end
index 90a55865397cefb6ce7e0829eca626a21734c2fc..957051833c0aba3a940d983b76dd3c5d2dd1de10 100644 (file)
@@ -33,39 +33,54 @@ class RemoteUsersTest < ActionDispatch::IntegrationTest
 
     @controller = Arvados::V1::UsersController.new
     ready = Thread::Queue.new
-    srv = WEBrick::HTTPServer.new(
-      Port: 0,
-      Logger: WEBrick::Log.new(
-        Rails.root.join("log", "webrick.log").to_s,
-        WEBrick::Log::INFO),
-      AccessLog: [[File.open(Rails.root.join(
-                              "log", "webrick_access.log").to_s, 'a+'),
-                   WEBrick::AccessLog::COMBINED_LOG_FORMAT]],
-      SSLEnable: true,
-      SSLVerifyClient: OpenSSL::SSL::VERIFY_NONE,
-      SSLPrivateKey: OpenSSL::PKey::RSA.new(
-        File.open(Rails.root.join("tmp", "self-signed.key")).read),
-      SSLCertificate: OpenSSL::X509::Certificate.new(
-        File.open(Rails.root.join("tmp", "self-signed.pem")).read),
-      SSLCertName: [["CN", WEBrick::Utils::getservername]],
-      StartCallback: lambda { ready.push(true) })
-    srv.mount_proc '/discovery/v1/apis/arvados/v1/rest' do |req, res|
-      Rails.cache.delete 'arvados_v1_rest_discovery'
-      res.body = Arvados::V1::SchemaController.new.send(:discovery_doc).to_json
-    end
-    srv.mount_proc '/arvados/v1/users/current' do |req, res|
-      res.status = @stub_status
-      res.body = @stub_content.is_a?(String) ? @stub_content : @stub_content.to_json
-    end
-    Thread.new do
-      srv.start
+
+    @remote_server = []
+    @remote_host = []
+
+    ['zbbbb', 'zbork'].each do |clusterid|
+      srv = WEBrick::HTTPServer.new(
+        Port: 0,
+        Logger: WEBrick::Log.new(
+          Rails.root.join("log", "webrick.log").to_s,
+          WEBrick::Log::INFO),
+        AccessLog: [[File.open(Rails.root.join(
+                                 "log", "webrick_access.log").to_s, 'a+'),
+                     WEBrick::AccessLog::COMBINED_LOG_FORMAT]],
+        SSLEnable: true,
+        SSLVerifyClient: OpenSSL::SSL::VERIFY_NONE,
+        SSLPrivateKey: OpenSSL::PKey::RSA.new(
+          File.open(Rails.root.join("tmp", "self-signed.key")).read),
+        SSLCertificate: OpenSSL::X509::Certificate.new(
+          File.open(Rails.root.join("tmp", "self-signed.pem")).read),
+        SSLCertName: [["CN", WEBrick::Utils::getservername]],
+        StartCallback: lambda { ready.push(true) })
+      srv.mount_proc '/discovery/v1/apis/arvados/v1/rest' do |req, res|
+        Rails.cache.delete 'arvados_v1_rest_discovery'
+        res.body = Arvados::V1::SchemaController.new.send(:discovery_doc).to_json
+      end
+      srv.mount_proc '/arvados/v1/users/current' do |req, res|
+        if clusterid == 'zbbbb' and req.header['authorization'][0][10..14] == 'zbork'
+          # asking zbbbb about zbork should yield an error, zbbbb doesn't trust zbork
+          res.status = 401
+          return
+        end
+        res.status = @stub_status
+        res.body = @stub_content.is_a?(String) ? @stub_content : @stub_content.to_json
+      end
+      srv.mount_proc '/arvados/v1/users/register' do |req, res|
+        res.status = @stub_status
+        res.body = @stub_content.is_a?(String) ? @stub_content : @stub_content.to_json
+      end
+      Thread.new do
+        srv.start
+      end
+      ready.pop
+      @remote_server << srv
+      @remote_host << "127.0.0.1:#{srv.config[:Port]}"
     end
-    ready.pop
-    @remote_server = srv
-    @remote_host = "127.0.0.1:#{srv.config[:Port]}"
-    Rails.configuration.RemoteClusters = Rails.configuration.RemoteClusters.merge({zbbbb: ActiveSupport::InheritableOptions.new({Host: @remote_host}),
-                                                                                   zbork: ActiveSupport::InheritableOptions.new({Host: @remote_host})})
-    Arvados::V1::SchemaController.any_instance.stubs(:root_url).returns "https://#{@remote_host}"
+    Rails.configuration.RemoteClusters = Rails.configuration.RemoteClusters.merge({zbbbb: ActiveSupport::InheritableOptions.new({Host: @remote_host[0]}),
+                                                                                   zbork: ActiveSupport::InheritableOptions.new({Host: @remote_host[1]})})
+    Arvados::V1::SchemaController.any_instance.stubs(:root_url).returns "https://#{@remote_host[0]}"
     @stub_status = 200
     @stub_content = {
       uuid: 'zbbbb-tpzed-000000000000000',
@@ -77,7 +92,9 @@ class RemoteUsersTest < ActionDispatch::IntegrationTest
   end
 
   teardown do
-    @remote_server.andand.stop
+    @remote_server.each do |srv|
+      srv.stop
+    end
   end
 
   test 'authenticate with remote token' do
@@ -148,7 +165,7 @@ class RemoteUsersTest < ActionDispatch::IntegrationTest
     assert_equal 'foo', json_response['username']
   end
 
-  test 'authenticate with remote token from misbhehaving remote cluster' do
+  test 'authenticate with remote token from misbehaving remote cluster' do
     get '/arvados/v1/users/current',
       params: {format: 'json'},
       headers: auth(remote: 'zbork')
@@ -255,6 +272,19 @@ class RemoteUsersTest < ActionDispatch::IntegrationTest
     assert_equal 'barney', json_response['username']
   end
 
+  test 'get user from Login cluster' do
+    Rails.configuration.Login.LoginCluster = 'zbbbb'
+    get '/arvados/v1/users/current',
+      params: {format: 'json'},
+      headers: auth(remote: 'zbbbb')
+    assert_response :success
+    assert_equal 'zbbbb-tpzed-000000000000000', json_response['uuid']
+    assert_equal true, json_response['is_admin']
+    assert_equal true, json_response['is_active']
+    assert_equal 'foo@example.com', json_response['email']
+    assert_equal 'barney', json_response['username']
+  end
+
   test 'pre-activate remote user' do
     post '/arvados/v1/users',
       params: {