services/api/app/models/user.rb

   1 class User < ArvadosModel
   2   include AssignUuid
   3   include KindAndEtag
   4   include CommonApiTemplate
   5   serialize :prefs, Hash
   6   has_many :api_client_authorizations
   7   before_update :prevent_privilege_escalation
   8   before_update :prevent_inactive_admin
   9   before_create :check_auto_admin
  10   after_create :add_system_group_permission_link
  11   after_create AdminNotifier
  12
  13   has_many :authorized_keys, :foreign_key => :authorized_user_uuid, :primary_key => :uuid
  14
  15   api_accessible :user, extend: :common do |t|
  16     t.add :email
  17     t.add :full_name
  18     t.add :first_name
  19     t.add :last_name
  20     t.add :identity_url
  21     t.add :is_active
  22     t.add :is_admin
  23     t.add :is_invited
  24     t.add :prefs
  25   end
  26
  27   ALL_PERMISSIONS = {read: true, write: true, manage: true}
  28
  29   def full_name
  30     "#{first_name} #{last_name}".strip
  31   end
  32
  33   def is_invited
  34     !!(self.is_active ||
  35        Rails.configuration.new_users_are_active ||
  36        self.groups_i_can(:read).select { |x| x.match /-f+$/ }.first)
  37   end
  38
  39   def groups_i_can(verb)
  40     self.group_permissions.select { |uuid, mask| mask[verb] }.keys
  41   end
  42
  43   def can?(actions)
  44     return true if is_admin
  45     actions.each do |action, target|
  46       target_uuid = target
  47       if target.respond_to? :uuid
  48         target_uuid = target.uuid
  49       end
  50       next if target_uuid == self.uuid
  51       next if (group_permissions[target_uuid] and
  52                group_permissions[target_uuid][action])
  53       if target.respond_to? :owner_uuid
  54         next if target.owner_uuid == self.uuid
  55         next if (group_permissions[target.owner_uuid] and
  56                  group_permissions[target.owner_uuid][action])
  57       end
  58       return false
  59     end
  60     true
  61   end
  62
  63   def self.invalidate_permissions_cache
  64     Rails.cache.delete_matched(/^groups_for_user_/)
  65   end
  66
  67   # Return a hash of {group_uuid: perm_hash} where perm_hash[:read]
  68   # and perm_hash[:write] are true if this user can read and write
  69   # objects owned by group_uuid.
  70   def group_permissions
  71     Rails.cache.fetch "groups_for_user_#{self.uuid}" do
  72       permissions_from = {}
  73       todo = {self.uuid => true}
  74       done = {}
  75       while !todo.empty?
  76         lookup_uuids = todo.keys
  77         lookup_uuids.each do |uuid| done[uuid] = true end
  78         todo = {}
  79         newgroups = []
  80         Group.where('owner_uuid in (?)', lookup_uuids).each do |group|
  81           newgroups << [group.owner_uuid, group.uuid, 'can_manage']
  82         end
  83         Link.where('tail_uuid in (?) and link_class = ? and (head_uuid like ? or head_uuid like ?)',
  84                    lookup_uuids,
  85                    'permission',
  86                    Group.uuid_like_pattern,
  87                    User.uuid_like_pattern).each do |link|
  88           newgroups << [link.tail_uuid, link.head_uuid, link.name]
  89         end
  90         newgroups.each do |tail_uuid, head_uuid, perm_name|
  91           unless done.has_key? head_uuid
  92             todo[head_uuid] = true
  93           end
  94           link_permissions = {}
  95           case perm_name
  96           when 'can_read'
  97             link_permissions = {read:true}
  98           when 'can_write'
  99             link_permissions = {read:true,write:true}
 100           when 'can_manage'
 101             link_permissions = ALL_PERMISSIONS
 102           end
 103           permissions_from[tail_uuid] ||= {}
 104           permissions_from[tail_uuid][head_uuid] ||= {}
 105           link_permissions.each do |k,v|
 106             permissions_from[tail_uuid][head_uuid][k] ||= v
 107           end
 108         end
 109       end
 110       search_permissions(self.uuid, permissions_from)
 111     end
 112   end
 113
 114   def self.setup(user, openid_prefix, repo_name=nil, vm_uuid=nil)
 115     return user.setup_repo_vm_links(repo_name, vm_uuid, openid_prefix)
 116   end
 117
 118   # create links
 119   def setup_repo_vm_links(repo_name, vm_uuid, openid_prefix)
 120     oid_login_perm = create_oid_login_perm openid_prefix
 121     repo_perm = create_user_repo_link repo_name
 122     vm_login_perm = create_vm_login_permission_link vm_uuid, repo_name
 123     group_perm = create_user_group_link
 124
 125     return [oid_login_perm, repo_perm, vm_login_perm, group_perm, self].compact
 126   end
 127
 128   # delete user signatures, login, repo, and vm perms, and mark as inactive
 129   def unsetup
 130     # delete oid_login_perms for this user
 131     oid_login_perms = Link.where(tail_uuid: self.email,
 132                                  link_class: 'permission',
 133                                  name: 'can_login')
 134     oid_login_perms.each do |perm|
 135       Link.delete perm
 136     end
 137
 138     # delete repo_perms for this user
 139     repo_perms = Link.where(tail_uuid: self.uuid,
 140                             link_class: 'permission',
 141                             name: 'can_write')
 142     repo_perms.each do |perm|
 143       Link.delete perm
 144     end
 145
 146     # delete vm_login_perms for this user
 147     vm_login_perms = Link.where(tail_uuid: self.uuid,
 148                                 link_class: 'permission',
 149                                 name: 'can_login')
 150     vm_login_perms.each do |perm|
 151       Link.delete perm
 152     end
 153
 154     # delete "All users' group read permissions for this user
 155     group = Group.where(name: 'All users').select do |g|
 156       g[:uuid].match /-f+$/
 157     end.first
 158     group_perms = Link.where(tail_uuid: self.uuid,
 159                              head_uuid: group[:uuid],
 160                              link_class: 'permission',
 161                              name: 'can_read')
 162     group_perms.each do |perm|
 163       Link.delete perm
 164     end
 165
 166     # delete any signatures by this user
 167     signed_uuids = Link.where(link_class: 'signature',
 168                               tail_uuid: self.uuid)
 169     signed_uuids.each do |sign|
 170       Link.delete sign
 171     end
 172
 173     # mark the user as inactive
 174     self.is_active = false
 175     self.save!
 176   end
 177
 178   protected
 179
 180   def permission_to_update
 181     # users must be able to update themselves (even if they are
 182     # inactive) in order to create sessions
 183     self == current_user or super
 184   end
 185
 186   def permission_to_create
 187     current_user.andand.is_admin or
 188       (self == current_user and
 189        self.is_active == Rails.configuration.new_users_are_active)
 190   end
 191
 192   def check_auto_admin
 193     if User.where("uuid not like '%-000000000000000'").where(:is_admin => true).count == 0 and Rails.configuration.auto_admin_user
 194       if current_user.email == Rails.configuration.auto_admin_user
 195         self.is_admin = true
 196         self.is_active = true
 197       end
 198     end
 199   end
 200
 201   def prevent_privilege_escalation
 202     if current_user.andand.is_admin
 203       return true
 204     end
 205     if self.is_active_changed?
 206       if self.is_active != self.is_active_was
 207         logger.warn "User #{current_user.uuid} tried to change is_active from #{self.is_admin_was} to #{self.is_admin} for #{self.uuid}"
 208         self.is_active = self.is_active_was
 209       end
 210     end
 211     if self.is_admin_changed?
 212       if self.is_admin != self.is_admin_was
 213         logger.warn "User #{current_user.uuid} tried to change is_admin from #{self.is_admin_was} to #{self.is_admin} for #{self.uuid}"
 214         self.is_admin = self.is_admin_was
 215       end
 216     end
 217     true
 218   end
 219
 220   def prevent_inactive_admin
 221     if self.is_admin and not self.is_active
 222       # There is no known use case for the strange set of permissions
 223       # that would result from this change. It's safest to assume it's
 224       # a mistake and disallow it outright.
 225       raise "Admin users cannot be inactive"
 226     end
 227     true
 228   end
 229
 230   def search_permissions(start, graph, merged={}, upstream_mask=nil, upstream_path={})
 231     nextpaths = graph[start]
 232     return merged if !nextpaths
 233     return merged if upstream_path.has_key? start
 234     upstream_path[start] = true
 235     upstream_mask ||= ALL_PERMISSIONS
 236     nextpaths.each do |head, mask|
 237       merged[head] ||= {}
 238       mask.each do |k,v|
 239         merged[head][k] ||= v if upstream_mask[k]
 240       end
 241       search_permissions(head, graph, merged, upstream_mask.select { |k,v| v && merged[head][k] }, upstream_path)
 242     end
 243     upstream_path.delete start
 244     merged
 245   end
 246
 247   def create_oid_login_perm (openid_prefix)
 248     login_perm_props = { "identity_url_prefix" => openid_prefix}
 249
 250     # Check oid_login_perm
 251     oid_login_perms = Link.where(tail_uuid: self.email,
 252                                    link_class: 'permission',
 253                                    name: 'can_login').where("head_uuid = ?", self.uuid)
 254
 255     if !oid_login_perms.any?
 256       # create openid login permission
 257       oid_login_perm = Link.create(link_class: 'permission',
 258                                    name: 'can_login',
 259                                    tail_uuid: self.email,
 260                                    head_uuid: self.uuid,
 261                                    properties: login_perm_props
 262                                   )
 263       logger.info { "openid login permission: " + oid_login_perm[:uuid] }
 264     else
 265       oid_login_perm = oid_login_perms.first
 266     end
 267
 268     return oid_login_perm
 269   end
 270
 271   def create_user_repo_link(repo_name)
 272     # repo_name is optional
 273     if not repo_name
 274       logger.warn ("Repository name not given for #{self.uuid}.")
 275       return
 276     end
 277
 278     # Check for an existing repository with the same name we're about to use.
 279     repo = Repository.where(name: repo_name).first
 280
 281     if repo
 282       logger.warn "Repository exists for #{repo_name}: #{repo[:uuid]}."
 283
 284       # Look for existing repository access for this repo
 285       repo_perms = Link.where(tail_uuid: self.uuid,
 286                               head_uuid: repo[:uuid],
 287                               link_class: 'permission',
 288                               name: 'can_write')
 289       if repo_perms.any?
 290         logger.warn "User already has repository access " +
 291             repo_perms.collect { |p| p[:uuid] }.inspect
 292         return repo_perms.first
 293       end
 294     end
 295
 296     # create repo, if does not already exist
 297     repo ||= Repository.create(name: repo_name)
 298     logger.info { "repo uuid: " + repo[:uuid] }
 299
 300     repo_perm = Link.create(tail_uuid: self.uuid,
 301                             head_uuid: repo[:uuid],
 302                             link_class: 'permission',
 303                             name: 'can_write')
 304     logger.info { "repo permission: " + repo_perm[:uuid] }
 305     return repo_perm
 306   end
 307
 308   # create login permission for the given vm_uuid, if it does not already exist
 309   def create_vm_login_permission_link(vm_uuid, repo_name)
 310     begin
 311
 312       # vm uuid is optional
 313       if vm_uuid
 314         vm = VirtualMachine.where(uuid: vm_uuid).first
 315
 316         if not vm
 317           logger.warn "Could not find virtual machine for #{vm_uuid.inspect}"
 318           raise "No vm found for #{vm_uuid}"
 319         end
 320       else
 321         return
 322       end
 323
 324       logger.info { "vm uuid: " + vm[:uuid] }
 325
 326       login_perms = Link.where(tail_uuid: self.uuid,
 327                               head_uuid: vm[:uuid],
 328                               link_class: 'permission',
 329                               name: 'can_login')
 330
 331       perm_exists = false
 332       login_perms.each do |perm|
 333         if perm.properties[:username] == repo_name
 334           perm_exists = true
 335           break
 336         end
 337       end
 338
 339       if !perm_exists
 340         login_perm = Link.create(tail_uuid: self.uuid,
 341                                  head_uuid: vm[:uuid],
 342                                  link_class: 'permission',
 343                                  name: 'can_login',
 344                                  properties: {username: repo_name})
 345         logger.info { "login permission: " + login_perm[:uuid] }
 346       else
 347         login_perm = login_perms.first
 348       end
 349
 350       return login_perm
 351     end
 352   end
 353
 354   # add the user to the 'All users' group
 355   def create_user_group_link
 356     # Look up the "All users" group (we expect uuid *-*-fffffffffffffff).
 357     group = Group.where(name: 'All users').select do |g|
 358       g[:uuid].match /-f+$/
 359     end.first
 360
 361     if not group
 362       logger.warn "No 'All users' group with uuid '*-*-fffffffffffffff'."
 363       raise "No 'All users' group with uuid '*-*-fffffffffffffff' is found"
 364     else
 365       logger.info { "\"All users\" group uuid: " + group[:uuid] }
 366
 367       group_perms = Link.where(tail_uuid: self.uuid,
 368                               head_uuid: group[:uuid],
 369                               link_class: 'permission',
 370                               name: 'can_read')
 371
 372       if !group_perms.any?
 373         group_perm = Link.create(tail_uuid: self.uuid,
 374                                  head_uuid: group[:uuid],
 375                                  link_class: 'permission',
 376                                  name: 'can_read')
 377         logger.info { "group permission: " + group_perm[:uuid] }
 378       else
 379         group_perm = group_perms.first
 380       end
 381
 382       return group_perm
 383     end
 384   end
 385
 386   # Give the special "System group" permission to manage this user and
 387   # all of this user's stuff.
 388   #
 389   def add_system_group_permission_link
 390     act_as_system_user do
 391       Link.create(link_class: 'permission',
 392                   name: 'can_manage',
 393                   tail_uuid: system_group_uuid,
 394                   head_uuid: self.uuid)
 395     end
 396   end
 397 end