sfa/plc/api.py

   1 #
   2 # SFA XML-RPC and SOAP interfaces
   3 #
   4 ### $Id$
   5 ### $URL$
   6 #
   7
   8 import sys
   9 import os
  10 import traceback
  11 import string
  12 import xmlrpclib
  13 from sfa.trust.auth import Auth
  14 from sfa.util.config import *
  15 from sfa.util.faults import *
  16 from sfa.util.debug import *
  17 from sfa.trust.rights import *
  18 from sfa.trust.credential import *
  19 from sfa.trust.certificate import *
  20 from sfa.util.namespace import *
  21 from sfa.util.api import *
  22 from sfa.util.nodemanager import NodeManager
  23 from sfa.util.sfalogging import *
  24 try:
  25     from collections import defaultdict
  26 except:
  27     class defaultdict(dict):
  28         def __init__(self, default_factory=None, *a, **kw):
  29             if (default_factory is not None and
  30                 not hasattr(default_factory, '__call__')):
  31                 raise TypeError('first argument must be callable')
  32             dict.__init__(self, *a, **kw)
  33             self.default_factory = default_factory
  34         def __getitem__(self, key):
  35             try:
  36                 return dict.__getitem__(self, key)
  37             except KeyError:
  38                 return self.__missing__(key)
  39         def __missing__(self, key):
  40             if self.default_factory is None:
  41                 raise KeyError(key)
  42             self[key] = value = self.default_factory()
  43             return value
  44         def __reduce__(self):
  45             if self.default_factory is None:
  46                 args = tuple()
  47             else:
  48                 args = self.default_factory,
  49             return type(self), args, None, None, self.items()
  50         def copy(self):
  51             return self.__copy__()
  52         def __copy__(self):
  53             return type(self)(self.default_factory, self)
  54         def __deepcopy__(self, memo):
  55             import copy
  56             return type(self)(self.default_factory,
  57                               copy.deepcopy(self.items()))
  58         def __repr__(self):
  59             return 'defaultdict(%s, %s)' % (self.default_factory,
  60                                             dict.__repr__(self))
  61 ## end of http://code.activestate.com/recipes/523034/ }}}
  62
  63 def list_to_dict(recs, key):
  64     """
  65     convert a list of dictionaries into a dictionary keyed on the
  66     specified dictionary key
  67     """
  68     keys = [rec[key] for rec in recs]
  69     return dict(zip(keys, recs))
  70
  71 class SfaAPI(BaseAPI):
  72
  73     # flat list of method names
  74     import sfa.methods
  75     methods = sfa.methods.all
  76
  77     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8",
  78                  methods='sfa.methods', peer_cert = None, interface = None,
  79                 key_file = None, cert_file = None, cache = None):
  80         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, \
  81                          peer_cert=peer_cert, interface=interface, key_file=key_file, \
  82                          cert_file=cert_file, cache=cache)
  83
  84         self.encoding = encoding
  85         from sfa.util.table import SfaTable
  86         self.SfaTable = SfaTable
  87         # Better just be documenting the API
  88         if config is None:
  89             return
  90
  91         # Load configuration
  92         self.config = Config(config)
  93         self.auth = Auth(peer_cert)
  94         self.interface = interface
  95         self.key_file = key_file
  96         self.key = Keypair(filename=self.key_file)
  97         self.cert_file = cert_file
  98         self.cert = Certificate(filename=self.cert_file)
  99         self.credential = None
 100         # Initialize the PLC shell only if SFA wraps a myPLC
 101         rspec_type = self.config.get_aggregate_type()
 102         if (rspec_type == 'pl' or rspec_type == 'vini' or rspec_type == 'eucalyptus'):
 103             self.plshell = self.getPLCShell()
 104             self.plshell_version = "4.3"
 105
 106         self.hrn = self.config.SFA_INTERFACE_HRN
 107         self.time_format = "%Y-%m-%d %H:%M:%S"
 108         self.logger=get_sfa_logger()
 109
 110     def getPLCShell(self):
 111         self.plauth = {'Username': self.config.SFA_PLC_USER,
 112                        'AuthMethod': 'password',
 113                        'AuthString': self.config.SFA_PLC_PASSWORD}
 114         try:
 115             sys.path.append(os.path.dirname(os.path.realpath("/usr/bin/plcsh")))
 116             self.plshell_type = 'direct'
 117             import PLC.Shell
 118             shell = PLC.Shell.Shell(globals = globals())
 119         except:
 120             self.plshell_type = 'xmlrpc'
 121             url = self.config.SFA_PLC_URL
 122             shell = xmlrpclib.Server(url, verbose = 0, allow_none = True)
 123
 124         return shell
 125
 126     def getCredential(self):
 127         """
 128         Retrun a valid credential for this interface.
 129         """
 130         if self.interface in ['registry']:
 131             return self.getCredentialFromLocalRegistry()
 132         else:
 133             return self.getCredentialFromRegistry()
 134
 135     def getDelegatedCredential(self, creds):
 136         """
 137         Attempt to find a credential delegated to us in
 138         the specified list of creds.
 139         """
 140         if creds and not isinstance(creds, list): creds = [creds]
 141         return filter_creds_by_caller(creds,self.hrn)
 142
 143     def getCredentialFromRegistry(self):
 144         """
 145         Get our credential from a remote registry
 146         """
 147         type = 'authority'
 148         path = self.config.SFA_DATA_DIR
 149         filename = ".".join([self.interface, self.hrn, type, "cred"])
 150         cred_filename = path + os.sep + filename
 151         try:
 152             credential = Credential(filename = cred_filename)
 153             return credential.save_to_string(save_parents=True)
 154         except IOError:
 155             from sfa.server.registry import Registries
 156             registries = Registries(self)
 157             registry = registries[self.hrn]
 158             cert_string=self.cert.save_to_string(save_parents=True)
 159             # get self credential
 160             self_cred = registry.get_self_credential(cert_string, type, self.hrn)
 161             # get credential
 162             cred = registry.get_credential(self_cred, type, self.hrn)
 163
 164             # save cred to file
 165             Credential(string=cred).save_to_file(cred_filename, save_parents=True)
 166             return cred
 167
 168     def getCredentialFromLocalRegistry(self):
 169         """
 170         Get our current credential directly from the local registry.
 171         """
 172
 173         hrn = self.hrn
 174         auth_hrn = self.auth.get_authority(hrn)
 175
 176         # is this a root or sub authority
 177         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 178             auth_hrn = hrn
 179         auth_info = self.auth.get_auth_info(auth_hrn)
 180         table = self.SfaTable()
 181         records = table.findObjects(hrn)
 182         if not records:
 183             raise RecordNotFound
 184         record = records[0]
 185         type = record['type']
 186         object_gid = record.get_gid_object()
 187         new_cred = Credential(subject = object_gid.get_subject())
 188         new_cred.set_gid_caller(object_gid)
 189         new_cred.set_gid_object(object_gid)
 190         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 191
 192         r1 = determine_rights(type, hrn)
 193         new_cred.set_privileges(r1)
 194
 195         auth_kind = "authority,ma,sa"
 196
 197         new_cred.set_parent(self.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
 198
 199         new_cred.encode()
 200         new_cred.sign()
 201
 202         return new_cred.save_to_string(save_parents=True)
 203
 204
 205     def loadCredential (self):
 206         """
 207         Attempt to load credential from file if it exists. If it doesnt get
 208         credential from registry.
 209         """
 210
 211         # see if this file exists
 212         # XX This is really the aggregate's credential. Using this is easier than getting
 213         # the registry's credential from iteslf (ssl errors).
 214         ma_cred_filename = self.config.SFA_DATA_DIR + os.sep + self.interface + self.hrn + ".ma.cred"
 215         try:
 216             self.credential = Credential(filename = ma_cred_filename)
 217         except IOError:
 218             self.credential = self.getCredentialFromRegistry()
 219
 220     ##
 221     # Convert SFA fields to PLC fields for use when registering up updating
 222     # registry record in the PLC database
 223     #
 224     # @param type type of record (user, slice, ...)
 225     # @param hrn human readable name
 226     # @param sfa_fields dictionary of SFA fields
 227     # @param pl_fields dictionary of PLC fields (output)
 228
 229     def sfa_fields_to_pl_fields(self, type, hrn, record):
 230
 231         def convert_ints(tmpdict, int_fields):
 232             for field in int_fields:
 233                 if field in tmpdict:
 234                     tmpdict[field] = int(tmpdict[field])
 235
 236         pl_record = {}
 237         #for field in record:
 238         #    pl_record[field] = record[field]
 239
 240         if type == "slice":
 241             if not "instantiation" in pl_record:
 242                 pl_record["instantiation"] = "plc-instantiated"
 243             pl_record["name"] = hrn_to_pl_slicename(hrn)
 244             if "url" in record:
 245                pl_record["url"] = record["url"]
 246             if "description" in record:
 247                 pl_record["description"] = record["description"]
 248             if "expires" in record:
 249                 pl_record["expires"] = int(record["expires"])
 250
 251         elif type == "node":
 252             if not "hostname" in pl_record:
 253                 if not "hostname" in record:
 254                     raise MissingSfaInfo("hostname")
 255                 pl_record["hostname"] = record["hostname"]
 256             if not "model" in pl_record:
 257                 pl_record["model"] = "geni"
 258
 259         elif type == "authority":
 260             pl_record["login_base"] = hrn_to_pl_login_base(hrn)
 261
 262             if not "name" in pl_record:
 263                 pl_record["name"] = hrn
 264
 265             if not "abbreviated_name" in pl_record:
 266                 pl_record["abbreviated_name"] = hrn
 267
 268             if not "enabled" in pl_record:
 269                 pl_record["enabled"] = True
 270
 271             if not "is_public" in pl_record:
 272                 pl_record["is_public"] = True
 273
 274         return pl_record
 275
 276     def fill_record_pl_info(self, records):
 277         """
 278         Fill in the planetlab specific fields of a SFA record. This
 279         involves calling the appropriate PLC method to retrieve the
 280         database record for the object.
 281
 282         PLC data is filled into the pl_info field of the record.
 283
 284         @param record: record to fill in field (in/out param)
 285         """
 286         # get ids by type
 287         node_ids, site_ids, slice_ids = [], [], []
 288         person_ids, key_ids = [], []
 289         type_map = {'node': node_ids, 'authority': site_ids,
 290                     'slice': slice_ids, 'user': person_ids}
 291
 292         for record in records:
 293             for type in type_map:
 294                 if type == record['type']:
 295                     type_map[type].append(record['pointer'])
 296
 297         # get pl records
 298         nodes, sites, slices, persons, keys = {}, {}, {}, {}, {}
 299         if node_ids:
 300             node_list = self.plshell.GetNodes(self.plauth, node_ids)
 301             nodes = list_to_dict(node_list, 'node_id')
 302         if site_ids:
 303             site_list = self.plshell.GetSites(self.plauth, site_ids)
 304             sites = list_to_dict(site_list, 'site_id')
 305         if slice_ids:
 306             slice_list = self.plshell.GetSlices(self.plauth, slice_ids)
 307             slices = list_to_dict(slice_list, 'slice_id')
 308         if person_ids:
 309             person_list = self.plshell.GetPersons(self.plauth, person_ids)
 310             persons = list_to_dict(person_list, 'person_id')
 311             for person in persons:
 312                 key_ids.extend(persons[person]['key_ids'])
 313
 314         pl_records = {'node': nodes, 'authority': sites,
 315                       'slice': slices, 'user': persons}
 316
 317         if key_ids:
 318             key_list = self.plshell.GetKeys(self.plauth, key_ids)
 319             keys = list_to_dict(key_list, 'key_id')
 320
 321         # fill record info
 322         for record in records:
 323             # records with pointer==-1 do not have plc info.
 324             # for example, the top level authority records which are
 325             # authorities, but not PL "sites"
 326             if record['pointer'] == -1:
 327                 continue
 328
 329             for type in pl_records:
 330                 if record['type'] == type:
 331                     if record['pointer'] in pl_records[type]:
 332                         record.update(pl_records[type][record['pointer']])
 333                         break
 334             # fill in key info
 335             if record['type'] == 'user':
 336                 pubkeys = [keys[key_id]['key'] for key_id in record['key_ids'] if key_id in keys]
 337                 record['keys'] = pubkeys
 338
 339         # fill in record hrns
 340         records = self.fill_record_hrns(records)
 341
 342         return records
 343
 344     def fill_record_hrns(self, records):
 345         """
 346         convert pl ids to hrns
 347         """
 348
 349         # get ids
 350         slice_ids, person_ids, site_ids, node_ids = [], [], [], []
 351         for record in records:
 352             if 'site_id' in record:
 353                 site_ids.append(record['site_id'])
 354             if 'site_ids' in records:
 355                 site_ids.extend(record['site_ids'])
 356             if 'person_ids' in record:
 357                 person_ids.extend(record['person_ids'])
 358             if 'slice_ids' in record:
 359                 slice_ids.extend(record['slice_ids'])
 360             if 'node_ids' in record:
 361                 node_ids.extend(record['node_ids'])
 362
 363         # get pl records
 364         slices, persons, sites, nodes = {}, {}, {}, {}
 365         if site_ids:
 366             site_list = self.plshell.GetSites(self.plauth, site_ids, ['site_id', 'login_base'])
 367             sites = list_to_dict(site_list, 'site_id')
 368         if person_ids:
 369             person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'email'])
 370             persons = list_to_dict(person_list, 'person_id')
 371         if slice_ids:
 372             slice_list = self.plshell.GetSlices(self.plauth, slice_ids, ['slice_id', 'name'])
 373             slices = list_to_dict(slice_list, 'slice_id')
 374         if node_ids:
 375             node_list = self.plshell.GetNodes(self.plauth, node_ids, ['node_id', 'hostname'])
 376             nodes = list_to_dict(node_list, 'node_id')
 377
 378         # convert ids to hrns
 379         for record in records:
 380
 381             # get all relevant data
 382             type = record['type']
 383             pointer = record['pointer']
 384             auth_hrn = self.hrn
 385             login_base = ''
 386             if pointer == -1:
 387                 continue
 388
 389             if 'site_id' in record:
 390                 site = sites[record['site_id']]
 391                 login_base = site['login_base']
 392                 record['site'] = ".".join([auth_hrn, login_base])
 393             if 'person_ids' in record:
 394                 emails = [persons[person_id]['email'] for person_id in record['person_ids'] \
 395                           if person_id in  persons]
 396                 usernames = [email.split('@')[0] for email in emails]
 397                 person_hrns = [".".join([auth_hrn, login_base, username]) for username in usernames]
 398                 record['persons'] = person_hrns
 399             if 'slice_ids' in record:
 400                 slicenames = [slices[slice_id]['name'] for slice_id in record['slice_ids'] \
 401                               if slice_id in slices]
 402                 slice_hrns = [slicename_to_hrn(auth_hrn, slicename) for slicename in slicenames]
 403                 record['slices'] = slice_hrns
 404             if 'node_ids' in record:
 405                 hostnames = [nodes[node_id]['hostname'] for node_id in record['node_ids'] \
 406                              if node_id in nodes]
 407                 node_hrns = [hostname_to_hrn(auth_hrn, login_base, hostname) for hostname in hostnames]
 408                 record['nodes'] = node_hrns
 409             if 'site_ids' in record:
 410                 login_bases = [sites[site_id]['login_base'] for site_id in record['site_ids'] \
 411                                if site_id in sites]
 412                 site_hrns = [".".join([auth_hrn, lbase]) for lbase in login_bases]
 413                 record['sites'] = site_hrns
 414
 415         return records
 416
 417     def fill_record_sfa_info(self, records):
 418
 419         def startswith(prefix, values):
 420             return [value for value in values if value.startswith(prefix)]
 421
 422         # get person ids
 423         person_ids = []
 424         site_ids = []
 425         for record in records:
 426             person_ids.extend(record.get("person_ids", []))
 427             site_ids.extend(record.get("site_ids", []))
 428             if 'site_id' in record:
 429                 site_ids.append(record['site_id'])
 430
 431         # get all pis from the sites we've encountered
 432         # and store them in a dictionary keyed on site_id
 433         site_pis = {}
 434         if site_ids:
 435             pi_filter = {'|roles': ['pi'], '|site_ids': site_ids}
 436             pi_list = self.plshell.GetPersons(self.plauth, pi_filter, ['person_id', 'site_ids'])
 437             for pi in pi_list:
 438                 # we will need the pi's hrns also
 439                 person_ids.append(pi['person_id'])
 440
 441                 # we also need to keep track of the sites these pis
 442                 # belong to
 443                 for site_id in pi['site_ids']:
 444                     if site_id in site_pis:
 445                         site_pis[site_id].append(pi)
 446                     else:
 447                         site_pis[site_id] = [pi]
 448
 449         # get sfa records for all records associated with these records.
 450         # we'll replace pl ids (person_ids) with hrns from the sfa records
 451         # we obtain
 452
 453         # get the sfa records
 454         table = self.SfaTable()
 455         person_list, persons = [], {}
 456         person_list = table.find({'type': 'user', 'pointer': person_ids})
 457         # create a hrns keyed on the sfa record's pointer.
 458         # Its possible for  multiple records to have the same pointer so
 459         # the dict's value will be a list of hrns.
 460         persons = defaultdict(list)
 461         for person in person_list:
 462             persons[person['pointer']].append(person)
 463
 464         # get the pl records
 465         pl_person_list, pl_persons = [], {}
 466         pl_person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'roles'])
 467         pl_persons = list_to_dict(pl_person_list, 'person_id')
 468
 469         # fill sfa info
 470         for record in records:
 471             # skip records with no pl info (top level authorities)
 472             if record['pointer'] == -1:
 473                 continue
 474             sfa_info = {}
 475             type = record['type']
 476             if (type == "slice"):
 477                 # all slice users are researchers
 478                 record['PI'] = []
 479                 record['researcher'] = []
 480                 for person_id in record['person_ids']:
 481                     hrns = [person['hrn'] for person in persons[person_id]]
 482                     record['researcher'].extend(hrns)
 483
 484                 # pis at the slice's site
 485                 pl_pis = site_pis[record['site_id']]
 486                 pi_ids = [pi['person_id'] for pi in pl_pis]
 487                 for person_id in pi_ids:
 488                     hrns = [person['hrn'] for person in persons[person_id]]
 489                     record['PI'].extend(hrns)
 490                 record['geni_urn'] = hrn_to_urn(record['hrn'], 'slice')
 491                 record['geni_creator'] = record['PI']
 492
 493             elif (type == "authority"):
 494                 record['PI'] = []
 495                 record['operator'] = []
 496                 record['owner'] = []
 497                 for pointer in record['person_ids']:
 498                     if pointer not in persons or pointer not in pl_persons:
 499                         # this means there is not sfa or pl record for this user
 500                         continue
 501                     hrns = [person['hrn'] for person in persons[pointer]]
 502                     roles = pl_persons[pointer]['roles']
 503                     if 'pi' in roles:
 504                         record['PI'].extend(hrns)
 505                     if 'tech' in roles:
 506                         record['operator'].extend(hrns)
 507                     if 'admin' in roles:
 508                         record['owner'].extend(hrns)
 509                     # xxx TODO: OrganizationName
 510             elif (type == "node"):
 511                 sfa_info['dns'] = record.get("hostname", "")
 512                 # xxx TODO: URI, LatLong, IP, DNS
 513
 514             elif (type == "user"):
 515                 sfa_info['email'] = record.get("email", "")
 516                 sfa_info['geni_urn'] = hrn_to_urn(record['hrn'], 'user')
 517                 sfa_info['geni_certificate'] = record['gid']
 518                 # xxx TODO: PostalAddress, Phone
 519             record.update(sfa_info)
 520
 521     def fill_record_info(self, records):
 522         """
 523         Given a SFA record, fill in the PLC specific and SFA specific
 524         fields in the record.
 525         """
 526         if not isinstance(records, list):
 527             records = [records]
 528
 529         self.fill_record_pl_info(records)
 530         self.fill_record_sfa_info(records)
 531
 532     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 533         # get a list of the HRNs tht are members of the old and new records
 534         if oldRecord:
 535             oldList = oldRecord.get(listName, [])
 536         else:
 537             oldList = []
 538         newList = record.get(listName, [])
 539
 540         # if the lists are the same, then we don't have to update anything
 541         if (oldList == newList):
 542             return
 543
 544         # build a list of the new person ids, by looking up each person to get
 545         # their pointer
 546         newIdList = []
 547         table = self.SfaTable()
 548         records = table.find({'type': 'user', 'hrn': newList})
 549         for rec in records:
 550             newIdList.append(rec['pointer'])
 551
 552         # build a list of the old person ids from the person_ids field
 553         if oldRecord:
 554             oldIdList = oldRecord.get("person_ids", [])
 555             containerId = oldRecord.get_pointer()
 556         else:
 557             # if oldRecord==None, then we are doing a Register, instead of an
 558             # update.
 559             oldIdList = []
 560             containerId = record.get_pointer()
 561
 562     # add people who are in the new list, but not the oldList
 563         for personId in newIdList:
 564             if not (personId in oldIdList):
 565                 addFunc(self.plauth, personId, containerId)
 566
 567         # remove people who are in the old list, but not the new list
 568         for personId in oldIdList:
 569             if not (personId in newIdList):
 570                 delFunc(self.plauth, personId, containerId)
 571
 572     def update_membership(self, oldRecord, record):
 573         if record.type == "slice":
 574             self.update_membership_list(oldRecord, record, 'researcher',
 575                                         self.plshell.AddPersonToSlice,
 576                                         self.plshell.DeletePersonFromSlice)
 577         elif record.type == "authority":
 578             # xxx TODO
 579             pass
 580
 581
 582
 583 class ComponentAPI(BaseAPI):
 584
 585     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8", methods='sfa.methods',
 586                  peer_cert = None, interface = None, key_file = None, cert_file = None):
 587
 588         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, peer_cert=peer_cert,
 589                          interface=interface, key_file=key_file, cert_file=cert_file)
 590         self.encoding = encoding
 591
 592         # Better just be documenting the API
 593         if config is None:
 594             return
 595
 596         self.nodemanager = NodeManager(self.config)
 597
 598     def sliver_exists(self):
 599         sliver_dict = self.nodemanager.GetXIDs()
 600         if slicename in sliver_dict.keys():
 601             return True
 602         else:
 603             return False
 604
 605     def get_registry(self):
 606         addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
 607         url = "http://%(addr)s:%(port)s" % locals()
 608         server = xmlrpcprotocol.get_server(url, self.key_file, self.cert_file)
 609         return server
 610
 611     def get_node_key(self):
 612         # this call requires no authentication,
 613         # so we can generate a random keypair here
 614         subject="component"
 615         (kfd, keyfile) = tempfile.mkstemp()
 616         (cfd, certfile) = tempfile.mkstemp()
 617         key = Keypair(create=True)
 618         key.save_to_file(keyfile)
 619         cert = Certificate(subject=subject)
 620         cert.set_issuer(key=key, subject=subject)
 621         cert.set_pubkey(key)
 622         cert.sign()
 623         cert.save_to_file(certfile)
 624         registry = self.get_registry()
 625         # the registry will scp the key onto the node
 626         registry.get_key()
 627
 628     def getCredential(self):
 629         """
 630         Get our credential from a remote registry
 631         """
 632         path = self.config.SFA_DATA_DIR
 633         config_dir = self.config.config_path
 634         credfile = path + os.sep + 'node.cred'
 635         try:
 636             credential = Credential(filename = cred_filename)
 637             return credential.save_to_string(save_parents=True)
 638         except IOError:
 639             node_pkey_file = config_dir + os.sep + "node.key"
 640             node_gid_file = config_dir + os.sep + "node.gid"
 641             if not os.path.exists(node_pkey_file) or \
 642                not os.path.exists(node_gid_file):
 643                 self.get_node_key()
 644
 645             # get node's hrn
 646             gid = GID(filename=node_gid_file)
 647             hrn = gid.get_hrn()
 648             # get credential from registry
 649             registry = self.get_registry()
 650             cred = registry.get_self_credential(cert_str, 'node', hrn)
 651             Credential(string=cred).save_to_file(credfile, save_parents=True)
 652
 653             return cred
 654
 655     def clean_key_cred(self):
 656         """
 657         remove the existing keypair and cred  and generate new ones
 658         """
 659         files = ["server.key", "server.cert", "node.cred"]
 660         for f in files:
 661             filepath = KEYDIR + os.sep + f
 662             if os.path.isfile(filepath):
 663                 os.unlink(f)
 664
 665         # install the new key pair
 666         # get_credential will take care of generating the new keypair
 667         # and credential
 668         self.get_node_key()
 669         self.getCredential()
 670
 671