geni/util/api.py

   1 #
   2 # Geniwrapper XML-RPC and SOAP interfaces
   3 #
   4 #
   5
   6 import sys
   7 import os
   8 import traceback
   9 import string
  10 import xmlrpclib
  11 from geni.util.auth import Auth
  12 from geni.util.config import *
  13 from geni.util.faults import *
  14 from geni.util.debug import *
  15 from geni.util.rights import *
  16 from geni.util.credential import *
  17 from geni.util.misc import *
  18
  19 # See "2.2 Characters" in the XML specification:
  20 #
  21 # #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD]
  22 # avoiding
  23 # [#x7F-#x84], [#x86-#x9F], [#xFDD0-#xFDDF]
  24
  25 invalid_xml_ascii = map(chr, range(0x0, 0x8) + [0xB, 0xC] + range(0xE, 0x1F))
  26 xml_escape_table = string.maketrans("".join(invalid_xml_ascii), "?" * len(invalid_xml_ascii))
  27
  28 def xmlrpclib_escape(s, replace = string.replace):
  29     """
  30     xmlrpclib does not handle invalid 7-bit control characters. This
  31     function augments xmlrpclib.escape, which by default only replaces
  32     '&', '<', and '>' with entities.
  33     """
  34
  35     # This is the standard xmlrpclib.escape function
  36     s = replace(s, "&", "&amp;")
  37     s = replace(s, "<", "&lt;")
  38     s = replace(s, ">", "&gt;",)
  39
  40     # Replace invalid 7-bit control characters with '?'
  41     return s.translate(xml_escape_table)
  42
  43 def xmlrpclib_dump(self, value, write):
  44     """
  45     xmlrpclib cannot marshal instances of subclasses of built-in
  46     types. This function overrides xmlrpclib.Marshaller.__dump so that
  47     any value that is an instance of one of its acceptable types is
  48     marshalled as that type.
  49
  50     xmlrpclib also cannot handle invalid 7-bit control characters. See
  51     above.
  52     """
  53
  54     # Use our escape function
  55     args = [self, value, write]
  56     if isinstance(value, (str, unicode)):
  57         args.append(xmlrpclib_escape)
  58
  59     try:
  60         # Try for an exact match first
  61         f = self.dispatch[type(value)]
  62     except KeyError:
  63         raise
  64         # Try for an isinstance() match
  65         for Type, f in self.dispatch.iteritems():
  66             if isinstance(value, Type):
  67                 f(*args)
  68                 return
  69         raise TypeError, "cannot marshal %s objects" % type(value)
  70     else:
  71         f(*args)
  72
  73 # You can't hide from me!
  74 xmlrpclib.Marshaller._Marshaller__dump = xmlrpclib_dump
  75
  76 # SOAP support is optional
  77 try:
  78     import SOAPpy
  79     from SOAPpy.Parser import parseSOAPRPC
  80     from SOAPpy.Types import faultType
  81     from SOAPpy.NS import NS
  82     from SOAPpy.SOAPBuilder import buildSOAP
  83 except ImportError:
  84     SOAPpy = None
  85
  86 import geni.methods
  87
  88 def import_deep(name):
  89     mod = __import__(name)
  90     components = name.split('.')
  91     for comp in components[1:]:
  92         mod = getattr(mod, comp)
  93     return mod
  94
  95 class GeniAPI:
  96
  97     # flat list of method names
  98     methods = geni.methods.methods
  99
 100     def __init__(self, config = "/usr/share/geniwrapper/geni/util/geni_config", encoding = "utf-8", peer_cert = None, interface = None, key_file = None, cert_file = None):
 101         self.encoding = encoding
 102
 103         # Better just be documenting the API
 104         if config is None:
 105             return
 106
 107         # Load configuration
 108         self.config = Config(config)
 109         self.auth = Auth(peer_cert)
 110         self.interface = interface
 111         self.key_file = key_file
 112         self.cert_file = cert_file
 113         self.credential = None
 114         self.plshell = self.getPLCShell()
 115         self.basedir = self.config.GENI_BASE_DIR + os.sep
 116         self.server_basedir = self.basedir + os.sep + "geni" + os.sep
 117         self.hrn = self.config.GENI_INTERFACE_HRN
 118         self.time_format = "%Y-%m-%d %H:%M:%S"
 119
 120
 121     def getPLCShell(self):
 122         self.plauth = {'Username': self.config.GENI_PLC_USER,
 123                          'AuthMethod': 'password',
 124                          'AuthString': self.config.GENI_PLC_PASSWORD}
 125         try:
 126             import PLC.Shell
 127             shell = PLC.Shell.Shell(globals = globals())
 128             shell.AuthCheck(self.plauth)
 129             return shell
 130         except ImportError:
 131             # connect via xmlrpc
 132             plc_host = self.config.GENI_PLC_HOST
 133             plc_port = self.config.GENI_PLC_PORT
 134             plc_api_path = self.config.GENI_PLC_API_PATH
 135             url = "https://%(plc_host)s:%(plc_port)s/%(plc_api_path)s/" % \
 136                    locals()
 137
 138             shell = xmlrpclib.Server(url, verbose = 0, allow_none = True)
 139             shell.AuthCheck(self.plauth)
 140             return shell
 141
 142     def getCredential(self):
 143         if self.interface in ['registry']:
 144             return self.getCredentialFromLocalRegistry()
 145         else:
 146             return self.getCredentialFromRegistry()
 147
 148
 149     def getCredentialFromRegistry(self):
 150         """
 151         Get our credential from a remote registry using a geniclient connection
 152         """
 153         type = 'authority'
 154         cred_filename = ".".join([self.server_basedir, self.interface, self.hrn, type, "cred"])
 155         try:
 156             credential = Credential(filename = cred_filename)
 157             return credential
 158         except IOError:
 159             from geni.registry import Registries
 160             registries = Registries(self)
 161             registry = registries[self.hrn]
 162             self_cred = registry.get_credential(None, type, self.hrn)
 163             cred = registry.get_credential(self_cred, type, self.hrn)
 164             cred.save_to_file(cred_filename, save_parents=True)
 165
 166     def getCredentialFromLocalRegistry(self):
 167         """
 168         Get our current credential directly from the local registry.
 169         """
 170
 171         hrn = self.hrn
 172         auth_hrn = self.auth.get_authority(hrn)
 173         if not auth_hrn:
 174             auth_hrn = hrn
 175         auth_info = self.auth.get_auth_info(auth_hrn)
 176         table = self.auth.get_auth_table(auth_hrn)
 177         records = table.resolve('*', hrn)
 178         if not records:
 179             raise RecordnotFound
 180         record = records[0]
 181         type = record.get_type()
 182         object_gid = record.get_gid_object()
 183         new_cred = Credential(subject = object_gid.get_subject())
 184         new_cred.set_gid_caller(object_gid)
 185         new_cred.set_gid_object(object_gid)
 186         new_cred.set_issuer(key=auth_info.get_pkey_object(), subject=auth_hrn)
 187         new_cred.set_pubkey(object_gid.get_pubkey())
 188         r1 = determine_rights(type, hrn)
 189         new_cred.set_privileges(r1)
 190
 191         auth_kind = "authority,ma,sa"
 192
 193         new_cred.set_parent(self.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
 194
 195         new_cred.encode()
 196         new_cred.sign()
 197
 198         return new_cred
 199
 200
 201     def loadCredential(self):
 202         """
 203         Attempt to load credential from file if it exists. If it doesnt get
 204         credential from registry.
 205         """
 206
 207         # see if this file exists
 208         # XX This is really the aggregate's credential. Using this is easier than getting
 209         # the registry's credential from iteslf (ssl errors).
 210         ma_cred_filename = self.server_basedir + os.sep + self.interface + self.hrn + ".ma.cred"
 211         try:
 212             self.credential = Credential(filename = ma_cred_filename)
 213         except IOError:
 214             self.credential = self.getCredentialFromRegistry()
 215
 216     ##
 217     # Convert geni fields to PLC fields for use when registering up updating
 218     # registry record in the PLC database
 219     #
 220     # @param type type of record (user, slice, ...)
 221     # @param hrn human readable name
 222     # @param geni_fields dictionary of geni fields
 223     # @param pl_fields dictionary of PLC fields (output)
 224
 225     def geni_fields_to_pl_fields(self, type, hrn, geni_fields, pl_fields):
 226         if type == "user":
 227             if not "email" in pl_fields:
 228                 if not "email" in geni_fields:
 229                     raise MissingGeniInfo("email")
 230                 pl_fields["email"] = geni_fields["email"]
 231
 232             if not "first_name" in pl_fields:
 233                 pl_fields["first_name"] = "geni"
 234
 235             if not "last_name" in pl_fields:
 236                 pl_fields["last_name"] = hrn
 237
 238         elif type == "slice":
 239             if not "instantiation" in pl_fields:
 240                 pl_fields["instantiation"] = "delegated"  # "plc-instantiated"
 241             if not "name" in pl_fields:
 242                 pl_fields["name"] = hrn_to_pl_slicename(hrn)
 243             if not "max_nodes" in pl_fields:
 244                 pl_fields["max_nodes"] = 10
 245
 246         elif type == "node":
 247             if not "hostname" in pl_fields:
 248                 if not "dns" in geni_fields:
 249                     raise MissingGeniInfo("dns")
 250                 pl_fields["hostname"] = geni_fields["dns"]
 251             if not "model" in pl_fields:
 252                 pl_fields["model"] = "geni"
 253
 254         elif type == "authority":
 255             pl_fields["login_base"] = hrn_to_pl_login_base(hrn)
 256
 257             if not "name" in pl_fields:
 258                 pl_fields["name"] = hrn
 259
 260             if not "abbreviated_name" in pl_fields:
 261                 pl_fields["abbreviated_name"] = hrn
 262
 263             if not "enabled" in pl_fields:
 264                 pl_fields["enabled"] = True
 265
 266             if not "is_public" in pl_fields:
 267                 pl_fields["is_public"] = True
 268
 269
 270
 271     def fill_record_pl_info(self, record):
 272         """
 273         Fill in the planetlab specific fields of a Geni record. This
 274         involves calling the appropraite PLC method to retrie the
 275         dtabase record for the object.
 276
 277         PLC data is filled into the pl_fino field of the record.
 278
 279         @param record record to fill in field (in/out param)
 280         """
 281         type = record.get_type()
 282         pointer = record.get_pointer()
 283
 284         # records with pointer==-1 do not have plc info associated with them.
 285         # for example, the top level authority records which are
 286         # authorities, but not PL "sites"
 287         if pointer == -1:
 288             record.set_pl_info({})
 289             return
 290
 291         if (type == "authority"):
 292             pl_res = self.plshell.GetSites(self.plauth, [pointer])
 293         elif (type == "slice"):
 294             pl_res = self.plshell.GetSlices(self.plauth, [pointer])
 295         elif (type == "user"):
 296             pl_res = self.plshell.GetPersons(self.plauth, [pointer])
 297             key_ids = pl_res[0]['key_ids']
 298             keys = self.plshell.GetKeys(self.plauth, key_ids)
 299             pubkeys = []
 300             if keys:
 301                 pubkeys = [key['key'] for key in keys]
 302             pl_res[0]['keys'] = pubkeys
 303         elif (type == "node"):
 304             pl_res = self.plshell.GetNodes(self.plauth, [pointer])
 305         else:
 306             raise UnknownGeniType(type)
 307
 308         if not pl_res:
 309             # the planetlab record no longer exists
 310             # TODO: delete the geni record ?
 311             raise PlanetLabRecordDoesNotExist(record.get_name())
 312
 313         record.set_pl_info(pl_res[0])
 314
 315
 316     def lookup_users(self, auth_table, user_id_list, role="*"):
 317         record_list = []
 318         for person_id in user_id_list:
 319             user_records = auth_table.find("user", person_id, "pointer")
 320             for user_record in user_records:
 321                 self.fill_record_info(user_record)
 322
 323                 user_roles = user_record.get_pl_info().get("roles")
 324                 if (role=="*") or (role in user_roles):
 325                     record_list.append(user_record.get_name())
 326         return record_list
 327
 328     def fill_record_geni_info(self, record):
 329         geni_info = {}
 330         type = record.get_type()
 331
 332         if (type == "slice"):
 333             auth_table = self.auth.get_auth_table(self.auth.get_authority(record.get_name()))
 334             person_ids = record.pl_info.get("person_ids", [])
 335             researchers = self.lookup_users(auth_table, person_ids)
 336             geni_info['researcher'] = researchers
 337
 338         elif (type == "authority"):
 339             auth_table = self.auth.get_auth_table(record.get_name())
 340             person_ids = record.pl_info.get("person_ids", [])
 341             pis = self.lookup_users(auth_table, person_ids, "pi")
 342             operators = self.lookup_users(auth_table, person_ids, "tech")
 343             owners = self.lookup_users(auth_table, person_ids, "admin")
 344             geni_info['pi'] = pis
 345             geni_info['operator'] = operators
 346             geni_info['owner'] = owners
 347             # TODO: OrganizationName
 348
 349         elif (type == "node"):
 350             geni_info['dns'] = record.pl_info.get("hostname", "")
 351             # TODO: URI, LatLong, IP, DNS
 352
 353         elif (type == "user"):
 354             geni_info['email'] = record.pl_info.get("email", "")
 355             # TODO: PostalAddress, Phone
 356
 357         record.set_geni_info(geni_info)
 358
 359     def fill_record_info(self, record):
 360         """
 361         Given a geni record, fill in the PLC specific and Geni specific
 362         fields in the record.
 363         """
 364         self.fill_record_pl_info(record)
 365         self.fill_record_geni_info(record)
 366
 367     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 368         # get a list of the HRNs tht are members of the old and new records^M
 369         if oldRecord:
 370             if oldRecord.pl_info == None:
 371                 oldRecord.pl_info = {}
 372             oldList = oldRecord.get_geni_info().get(listName, [])
 373         else:
 374             oldList = []
 375         newList = record.get_geni_info().get(listName, [])
 376
 377         # if the lists are the same, then we don't have to update anything
 378         if (oldList == newList):
 379             return
 380
 381         # build a list of the new person ids, by looking up each person to get
 382         # their pointer
 383         newIdList = []
 384         for hrn in newList:
 385             auth_hrn = self.auth.get_authority(hrn)
 386             if not auth_hrn:
 387                 auth_hrn = hrn
 388             auth_info = self.auth.get_auth_info(auth_hrn)
 389             table = self.auth.get_auth_table(auth_hrn)
 390             records = table.resolve('user', hrn)
 391             if records:
 392                 userRecord = records[0]
 393                 newIdList.append(userRecord.get_pointer())
 394
 395         # build a list of the old person ids from the person_ids field of the
 396         # pl_info
 397         if oldRecord:
 398             oldIdList = oldRecord.pl_info.get("person_ids", [])
 399             containerId = oldRecord.get_pointer()
 400         else:
 401             # if oldRecord==None, then we are doing a Register, instead of an
 402             # update.
 403             oldIdList = []
 404             containerId = record.get_pointer()
 405
 406     # add people who are in the new list, but not the oldList
 407         for personId in newIdList:
 408             if not (personId in oldIdList):
 409                 print "adding id", personId, "to", record.get_name()
 410                 addFunc(self.plauth, personId, containerId)
 411
 412         # remove people who are in the old list, but not the new list
 413         for personId in oldIdList:
 414             if not (personId in newIdList):
 415                 print "removing id", personId, "from", record.get_name()
 416                 delFunc(self.plauth, personId, containerId)
 417
 418     def update_membership(self, oldRecord, record):
 419         if record.type == "slice":
 420             self.update_membership_list(oldRecord, record, 'researcher',
 421                                         self.plshell.AddPersonToSlice,
 422                                         self.plshell.DeletePersonFromSlice)
 423         elif record.type == "authority":
 424             # TODO
 425             pass
 426
 427
 428     def callable(self, method):
 429         """
 430         Return a new instance of the specified method.
 431         """
 432         # Look up method
 433         if method not in self.methods:
 434             raise GeniInvalidAPIMethod, method
 435
 436         # Get new instance of method
 437         try:
 438             classname = method.split(".")[-1]
 439             module = __import__("geni.methods." + method, globals(), locals(), [classname])
 440             callablemethod = getattr(module, classname)(self)
 441             return getattr(module, classname)(self)
 442         except ImportError, AttributeError:
 443             raise
 444             raise GeniInvalidAPIMethod, method
 445
 446     def call(self, source, method, *args):
 447         """
 448         Call the named method from the specified source with the
 449         specified arguments.
 450         """
 451         function = self.callable(method)
 452         function.source = source
 453         return function(*args)
 454
 455     def handle(self, source, data):
 456         """
 457         Handle an XML-RPC or SOAP request from the specified source.
 458         """
 459
 460         # Parse request into method name and arguments
 461         try:
 462             interface = xmlrpclib
 463             (args, method) = xmlrpclib.loads(data)
 464             methodresponse = True
 465         except Exception, e:
 466             if SOAPpy is not None:
 467                 interface = SOAPpy
 468                 (r, header, body, attrs) = parseSOAPRPC(data, header = 1, body = 1, attrs = 1)
 469                 method = r._name
 470                 args = r._aslist()
 471                 # XXX Support named arguments
 472             else:
 473                 raise e
 474
 475         try:
 476             result = self.call(source, method, *args)
 477         except Exception, fault:
 478             traceback.print_exc(file = log)
 479             # Handle expected faults
 480             if interface == xmlrpclib:
 481                 result = fault
 482                 methodresponse = None
 483             elif interface == SOAPpy:
 484                 result = faultParameter(NS.ENV_T + ":Server", "Method Failed", method)
 485                 result._setDetail("Fault %d: %s" % (fault.faultCode, fault.faultString))
 486
 487         # Return result
 488         if interface == xmlrpclib:
 489             if not isinstance(result, GeniFault):
 490                 result = (result,)
 491
 492             data = xmlrpclib.dumps(result, methodresponse = True, encoding = self.encoding, allow_none = 1)
 493         elif interface == SOAPpy:
 494             data = buildSOAP(kw = {'%sResponse' % method: {'Result': result}}, encoding = self.encoding)
 495
 496         return data