sfa/plc/api.py

   1 #
   2 # SFA XML-RPC and SOAP interfaces
   3 #
   4
   5 import sys
   6 import os
   7 import traceback
   8 import string
   9 import xmlrpclib
  10
  11 from sfa.util.faults import *
  12 from sfa.util.api import *
  13 from sfa.util.config import *
  14 from sfa.util.sfalogging import sfa_logger
  15 import sfa.util.xmlrpcprotocol as xmlrpcprotocol
  16 from sfa.trust.auth import Auth
  17 from sfa.trust.rights import Right, Rights, determine_rights
  18 from sfa.trust.credential import Credential,Keypair
  19 from sfa.trust.certificate import Certificate
  20 from sfa.util.xrn import get_authority, hrn_to_urn
  21 from sfa.util.plxrn import hostname_to_hrn, hrn_to_pl_slicename, hrn_to_pl_slicename, slicename_to_hrn
  22 from sfa.util.nodemanager import NodeManager
  23 try:
  24     from collections import defaultdict
  25 except:
  26     class defaultdict(dict):
  27         def __init__(self, default_factory=None, *a, **kw):
  28             if (default_factory is not None and
  29                 not hasattr(default_factory, '__call__')):
  30                 raise TypeError('first argument must be callable')
  31             dict.__init__(self, *a, **kw)
  32             self.default_factory = default_factory
  33         def __getitem__(self, key):
  34             try:
  35                 return dict.__getitem__(self, key)
  36             except KeyError:
  37                 return self.__missing__(key)
  38         def __missing__(self, key):
  39             if self.default_factory is None:
  40                 raise KeyError(key)
  41             self[key] = value = self.default_factory()
  42             return value
  43         def __reduce__(self):
  44             if self.default_factory is None:
  45                 args = tuple()
  46             else:
  47                 args = self.default_factory,
  48             return type(self), args, None, None, self.items()
  49         def copy(self):
  50             return self.__copy__()
  51         def __copy__(self):
  52             return type(self)(self.default_factory, self)
  53         def __deepcopy__(self, memo):
  54             import copy
  55             return type(self)(self.default_factory,
  56                               copy.deepcopy(self.items()))
  57         def __repr__(self):
  58             return 'defaultdict(%s, %s)' % (self.default_factory,
  59                                             dict.__repr__(self))
  60 ## end of http://code.activestate.com/recipes/523034/ }}}
  61
  62 def list_to_dict(recs, key):
  63     """
  64     convert a list of dictionaries into a dictionary keyed on the
  65     specified dictionary key
  66     """
  67     keys = [rec[key] for rec in recs]
  68     return dict(zip(keys, recs))
  69
  70 class SfaAPI(BaseAPI):
  71
  72     # flat list of method names
  73     import sfa.methods
  74     methods = sfa.methods.all
  75
  76     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8",
  77                  methods='sfa.methods', peer_cert = None, interface = None,
  78                 key_file = None, cert_file = None, cache = None):
  79         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, \
  80                          peer_cert=peer_cert, interface=interface, key_file=key_file, \
  81                          cert_file=cert_file, cache=cache)
  82
  83         self.encoding = encoding
  84         from sfa.util.table import SfaTable
  85         self.SfaTable = SfaTable
  86         # Better just be documenting the API
  87         if config is None:
  88             return
  89
  90         # Load configuration
  91         self.config = Config(config)
  92         self.auth = Auth(peer_cert)
  93         self.interface = interface
  94         self.key_file = key_file
  95         self.key = Keypair(filename=self.key_file)
  96         self.cert_file = cert_file
  97         self.cert = Certificate(filename=self.cert_file)
  98         self.credential = None
  99         # Initialize the PLC shell only if SFA wraps a myPLC
 100         rspec_type = self.config.get_aggregate_type()
 101         if (rspec_type == 'pl' or rspec_type == 'vini' or rspec_type == 'eucalyptus'):
 102             self.plshell = self.getPLCShell()
 103             self.plshell_version = "4.3"
 104
 105         self.hrn = self.config.SFA_INTERFACE_HRN
 106         self.time_format = "%Y-%m-%d %H:%M:%S"
 107         self.logger=sfa_logger()
 108
 109     def getPLCShell(self):
 110         self.plauth = {'Username': self.config.SFA_PLC_USER,
 111                        'AuthMethod': 'password',
 112                        'AuthString': self.config.SFA_PLC_PASSWORD}
 113         try:
 114             sys.path.append(os.path.dirname(os.path.realpath("/usr/bin/plcsh")))
 115             self.plshell_type = 'direct'
 116             import PLC.Shell
 117             shell = PLC.Shell.Shell(globals = globals())
 118         except:
 119             self.plshell_type = 'xmlrpc'
 120             url = self.config.SFA_PLC_URL
 121             shell = xmlrpclib.Server(url, verbose = 0, allow_none = True)
 122
 123         return shell
 124
 125     def getCredential(self):
 126         """
 127         Return a valid credential for this interface.
 128         """
 129         if self.interface in ['registry']:
 130             return self.getCredentialFromLocalRegistry()
 131         else:
 132             return self.getCredentialFromRegistry()
 133
 134     def getDelegatedCredential(self, creds):
 135         """
 136         Attempt to find a credential delegated to us in
 137         the specified list of creds.
 138         """
 139         if creds and not isinstance(creds, list):
 140             creds = [creds]
 141         delegated_creds = filter_creds_by_caller(creds,self.hrn)
 142         if not delegated_creds:
 143             return None
 144         return delegated_creds[0]
 145
 146     def getCredentialFromRegistry(self):
 147         """
 148         Get our credential from a remote registry
 149         """
 150         type = 'authority'
 151         path = self.config.SFA_DATA_DIR
 152         filename = ".".join([self.interface, self.hrn, type, "cred"])
 153         cred_filename = path + os.sep + filename
 154         try:
 155             credential = Credential(filename = cred_filename)
 156             return credential.save_to_string(save_parents=True)
 157         except IOError:
 158             from sfa.server.registry import Registries
 159             registries = Registries(self)
 160             registry = registries[self.hrn]
 161             cert_string=self.cert.save_to_string(save_parents=True)
 162             # get self credential
 163             self_cred = registry.GetSelfCredential(cert_string, self.hrn, type)
 164             # get credential
 165             cred = registry.GetCredential(self_cred, self.hrn, type)
 166
 167             # save cred to file
 168             Credential(string=cred).save_to_file(cred_filename, save_parents=True)
 169             return cred
 170
 171     def getCredentialFromLocalRegistry(self):
 172         """
 173         Get our current credential directly from the local registry.
 174         """
 175
 176         hrn = self.hrn
 177         auth_hrn = self.auth.get_authority(hrn)
 178
 179         # is this a root or sub authority
 180         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 181             auth_hrn = hrn
 182         auth_info = self.auth.get_auth_info(auth_hrn)
 183         table = self.SfaTable()
 184         records = table.findObjects(hrn)
 185         if not records:
 186             raise RecordNotFound
 187         record = records[0]
 188         type = record['type']
 189         object_gid = record.get_gid_object()
 190         new_cred = Credential(subject = object_gid.get_subject())
 191         new_cred.set_gid_caller(object_gid)
 192         new_cred.set_gid_object(object_gid)
 193         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 194
 195         r1 = determine_rights(type, hrn)
 196         new_cred.set_privileges(r1)
 197
 198         auth_kind = "authority,ma,sa"
 199
 200         new_cred.set_parent(self.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
 201
 202         new_cred.encode()
 203         new_cred.sign()
 204
 205         return new_cred.save_to_string(save_parents=True)
 206
 207
 208     def loadCredential (self):
 209         """
 210         Attempt to load credential from file if it exists. If it doesnt get
 211         credential from registry.
 212         """
 213
 214         # see if this file exists
 215         # XX This is really the aggregate's credential. Using this is easier than getting
 216         # the registry's credential from iteslf (ssl errors).
 217         ma_cred_filename = self.config.SFA_DATA_DIR + os.sep + self.interface + self.hrn + ".ma.cred"
 218         try:
 219             self.credential = Credential(filename = ma_cred_filename)
 220         except IOError:
 221             self.credential = self.getCredentialFromRegistry()
 222
 223     ##
 224     # Convert SFA fields to PLC fields for use when registering up updating
 225     # registry record in the PLC database
 226     #
 227     # @param type type of record (user, slice, ...)
 228     # @param hrn human readable name
 229     # @param sfa_fields dictionary of SFA fields
 230     # @param pl_fields dictionary of PLC fields (output)
 231
 232     def sfa_fields_to_pl_fields(self, type, hrn, record):
 233
 234         def convert_ints(tmpdict, int_fields):
 235             for field in int_fields:
 236                 if field in tmpdict:
 237                     tmpdict[field] = int(tmpdict[field])
 238
 239         pl_record = {}
 240         #for field in record:
 241         #    pl_record[field] = record[field]
 242
 243         if type == "slice":
 244             if not "instantiation" in pl_record:
 245                 pl_record["instantiation"] = "plc-instantiated"
 246             pl_record["name"] = hrn_to_pl_slicename(hrn)
 247             if "url" in record:
 248                pl_record["url"] = record["url"]
 249             if "description" in record:
 250                 pl_record["description"] = record["description"]
 251             if "expires" in record:
 252                 pl_record["expires"] = int(record["expires"])
 253
 254         elif type == "node":
 255             if not "hostname" in pl_record:
 256                 if not "hostname" in record:
 257                     raise MissingSfaInfo("hostname")
 258                 pl_record["hostname"] = record["hostname"]
 259             if not "model" in pl_record:
 260                 pl_record["model"] = "geni"
 261
 262         elif type == "authority":
 263             pl_record["login_base"] = hrn_to_pl_login_base(hrn)
 264
 265             if not "name" in pl_record:
 266                 pl_record["name"] = hrn
 267
 268             if not "abbreviated_name" in pl_record:
 269                 pl_record["abbreviated_name"] = hrn
 270
 271             if not "enabled" in pl_record:
 272                 pl_record["enabled"] = True
 273
 274             if not "is_public" in pl_record:
 275                 pl_record["is_public"] = True
 276
 277         return pl_record
 278
 279     def fill_record_pl_info(self, records):
 280         """
 281         Fill in the planetlab specific fields of a SFA record. This
 282         involves calling the appropriate PLC method to retrieve the
 283         database record for the object.
 284
 285         PLC data is filled into the pl_info field of the record.
 286
 287         @param record: record to fill in field (in/out param)
 288         """
 289         # get ids by type
 290         node_ids, site_ids, slice_ids = [], [], []
 291         person_ids, key_ids = [], []
 292         type_map = {'node': node_ids, 'authority': site_ids,
 293                     'slice': slice_ids, 'user': person_ids}
 294
 295         for record in records:
 296             for type in type_map:
 297                 if type == record['type']:
 298                     type_map[type].append(record['pointer'])
 299
 300         # get pl records
 301         nodes, sites, slices, persons, keys = {}, {}, {}, {}, {}
 302         if node_ids:
 303             node_list = self.plshell.GetNodes(self.plauth, node_ids)
 304             nodes = list_to_dict(node_list, 'node_id')
 305         if site_ids:
 306             site_list = self.plshell.GetSites(self.plauth, site_ids)
 307             sites = list_to_dict(site_list, 'site_id')
 308         if slice_ids:
 309             slice_list = self.plshell.GetSlices(self.plauth, slice_ids)
 310             slices = list_to_dict(slice_list, 'slice_id')
 311         if person_ids:
 312             person_list = self.plshell.GetPersons(self.plauth, person_ids)
 313             persons = list_to_dict(person_list, 'person_id')
 314             for person in persons:
 315                 key_ids.extend(persons[person]['key_ids'])
 316
 317         pl_records = {'node': nodes, 'authority': sites,
 318                       'slice': slices, 'user': persons}
 319
 320         if key_ids:
 321             key_list = self.plshell.GetKeys(self.plauth, key_ids)
 322             keys = list_to_dict(key_list, 'key_id')
 323
 324         # fill record info
 325         for record in records:
 326             # records with pointer==-1 do not have plc info.
 327             # for example, the top level authority records which are
 328             # authorities, but not PL "sites"
 329             if record['pointer'] == -1:
 330                 continue
 331
 332             for type in pl_records:
 333                 if record['type'] == type:
 334                     if record['pointer'] in pl_records[type]:
 335                         record.update(pl_records[type][record['pointer']])
 336                         break
 337             # fill in key info
 338             if record['type'] == 'user':
 339                 pubkeys = [keys[key_id]['key'] for key_id in record['key_ids'] if key_id in keys]
 340                 record['keys'] = pubkeys
 341
 342         # fill in record hrns
 343         records = self.fill_record_hrns(records)
 344
 345         return records
 346
 347     def fill_record_hrns(self, records):
 348         """
 349         convert pl ids to hrns
 350         """
 351
 352         # get ids
 353         slice_ids, person_ids, site_ids, node_ids = [], [], [], []
 354         for record in records:
 355             if 'site_id' in record:
 356                 site_ids.append(record['site_id'])
 357             if 'site_ids' in records:
 358                 site_ids.extend(record['site_ids'])
 359             if 'person_ids' in record:
 360                 person_ids.extend(record['person_ids'])
 361             if 'slice_ids' in record:
 362                 slice_ids.extend(record['slice_ids'])
 363             if 'node_ids' in record:
 364                 node_ids.extend(record['node_ids'])
 365
 366         # get pl records
 367         slices, persons, sites, nodes = {}, {}, {}, {}
 368         if site_ids:
 369             site_list = self.plshell.GetSites(self.plauth, site_ids, ['site_id', 'login_base'])
 370             sites = list_to_dict(site_list, 'site_id')
 371         if person_ids:
 372             person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'email'])
 373             persons = list_to_dict(person_list, 'person_id')
 374         if slice_ids:
 375             slice_list = self.plshell.GetSlices(self.plauth, slice_ids, ['slice_id', 'name'])
 376             slices = list_to_dict(slice_list, 'slice_id')
 377         if node_ids:
 378             node_list = self.plshell.GetNodes(self.plauth, node_ids, ['node_id', 'hostname'])
 379             nodes = list_to_dict(node_list, 'node_id')
 380
 381         # convert ids to hrns
 382         for record in records:
 383
 384             # get all relevant data
 385             type = record['type']
 386             pointer = record['pointer']
 387             auth_hrn = self.hrn
 388             login_base = ''
 389             if pointer == -1:
 390                 continue
 391
 392             if 'site_id' in record:
 393                 site = sites[record['site_id']]
 394                 login_base = site['login_base']
 395                 record['site'] = ".".join([auth_hrn, login_base])
 396             if 'person_ids' in record:
 397                 emails = [persons[person_id]['email'] for person_id in record['person_ids'] \
 398                           if person_id in  persons]
 399                 usernames = [email.split('@')[0] for email in emails]
 400                 person_hrns = [".".join([auth_hrn, login_base, username]) for username in usernames]
 401                 record['persons'] = person_hrns
 402             if 'slice_ids' in record:
 403                 slicenames = [slices[slice_id]['name'] for slice_id in record['slice_ids'] \
 404                               if slice_id in slices]
 405                 slice_hrns = [slicename_to_hrn(auth_hrn, slicename) for slicename in slicenames]
 406                 record['slices'] = slice_hrns
 407             if 'node_ids' in record:
 408                 hostnames = [nodes[node_id]['hostname'] for node_id in record['node_ids'] \
 409                              if node_id in nodes]
 410                 node_hrns = [hostname_to_hrn(auth_hrn, login_base, hostname) for hostname in hostnames]
 411                 record['nodes'] = node_hrns
 412             if 'site_ids' in record:
 413                 login_bases = [sites[site_id]['login_base'] for site_id in record['site_ids'] \
 414                                if site_id in sites]
 415                 site_hrns = [".".join([auth_hrn, lbase]) for lbase in login_bases]
 416                 record['sites'] = site_hrns
 417
 418         return records
 419
 420     def fill_record_sfa_info(self, records):
 421
 422         def startswith(prefix, values):
 423             return [value for value in values if value.startswith(prefix)]
 424
 425         # get person ids
 426         person_ids = []
 427         site_ids = []
 428         for record in records:
 429             person_ids.extend(record.get("person_ids", []))
 430             site_ids.extend(record.get("site_ids", []))
 431             if 'site_id' in record:
 432                 site_ids.append(record['site_id'])
 433
 434         # get all pis from the sites we've encountered
 435         # and store them in a dictionary keyed on site_id
 436         site_pis = {}
 437         if site_ids:
 438             pi_filter = {'|roles': ['pi'], '|site_ids': site_ids}
 439             pi_list = self.plshell.GetPersons(self.plauth, pi_filter, ['person_id', 'site_ids'])
 440             for pi in pi_list:
 441                 # we will need the pi's hrns also
 442                 person_ids.append(pi['person_id'])
 443
 444                 # we also need to keep track of the sites these pis
 445                 # belong to
 446                 for site_id in pi['site_ids']:
 447                     if site_id in site_pis:
 448                         site_pis[site_id].append(pi)
 449                     else:
 450                         site_pis[site_id] = [pi]
 451
 452         # get sfa records for all records associated with these records.
 453         # we'll replace pl ids (person_ids) with hrns from the sfa records
 454         # we obtain
 455
 456         # get the sfa records
 457         table = self.SfaTable()
 458         person_list, persons = [], {}
 459         person_list = table.find({'type': 'user', 'pointer': person_ids})
 460         # create a hrns keyed on the sfa record's pointer.
 461         # Its possible for  multiple records to have the same pointer so
 462         # the dict's value will be a list of hrns.
 463         persons = defaultdict(list)
 464         for person in person_list:
 465             persons[person['pointer']].append(person)
 466
 467         # get the pl records
 468         pl_person_list, pl_persons = [], {}
 469         pl_person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'roles'])
 470         pl_persons = list_to_dict(pl_person_list, 'person_id')
 471
 472         # fill sfa info
 473         for record in records:
 474             # skip records with no pl info (top level authorities)
 475             if record['pointer'] == -1:
 476                 continue
 477             sfa_info = {}
 478             type = record['type']
 479             if (type == "slice"):
 480                 # all slice users are researchers
 481                 record['PI'] = []
 482                 record['researcher'] = []
 483                 for person_id in record['person_ids']:
 484                     hrns = [person['hrn'] for person in persons[person_id]]
 485                     record['researcher'].extend(hrns)
 486
 487                 # pis at the slice's site
 488                 pl_pis = site_pis[record['site_id']]
 489                 pi_ids = [pi['person_id'] for pi in pl_pis]
 490                 for person_id in pi_ids:
 491                     hrns = [person['hrn'] for person in persons[person_id]]
 492                     record['PI'].extend(hrns)
 493                 record['geni_urn'] = hrn_to_urn(record['hrn'], 'slice')
 494                 record['geni_creator'] = record['PI']
 495
 496             elif (type == "authority"):
 497                 record['PI'] = []
 498                 record['operator'] = []
 499                 record['owner'] = []
 500                 for pointer in record['person_ids']:
 501                     if pointer not in persons or pointer not in pl_persons:
 502                         # this means there is not sfa or pl record for this user
 503                         continue
 504                     hrns = [person['hrn'] for person in persons[pointer]]
 505                     roles = pl_persons[pointer]['roles']
 506                     if 'pi' in roles:
 507                         record['PI'].extend(hrns)
 508                     if 'tech' in roles:
 509                         record['operator'].extend(hrns)
 510                     if 'admin' in roles:
 511                         record['owner'].extend(hrns)
 512                     # xxx TODO: OrganizationName
 513             elif (type == "node"):
 514                 sfa_info['dns'] = record.get("hostname", "")
 515                 # xxx TODO: URI, LatLong, IP, DNS
 516
 517             elif (type == "user"):
 518                 sfa_info['email'] = record.get("email", "")
 519                 sfa_info['geni_urn'] = hrn_to_urn(record['hrn'], 'user')
 520                 sfa_info['geni_certificate'] = record['gid']
 521                 # xxx TODO: PostalAddress, Phone
 522             record.update(sfa_info)
 523
 524     def fill_record_info(self, records):
 525         """
 526         Given a SFA record, fill in the PLC specific and SFA specific
 527         fields in the record.
 528         """
 529         if not isinstance(records, list):
 530             records = [records]
 531
 532         self.fill_record_pl_info(records)
 533         self.fill_record_sfa_info(records)
 534
 535     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 536         # get a list of the HRNs tht are members of the old and new records
 537         if oldRecord:
 538             oldList = oldRecord.get(listName, [])
 539         else:
 540             oldList = []
 541         newList = record.get(listName, [])
 542
 543         # if the lists are the same, then we don't have to update anything
 544         if (oldList == newList):
 545             return
 546
 547         # build a list of the new person ids, by looking up each person to get
 548         # their pointer
 549         newIdList = []
 550         table = self.SfaTable()
 551         records = table.find({'type': 'user', 'hrn': newList})
 552         for rec in records:
 553             newIdList.append(rec['pointer'])
 554
 555         # build a list of the old person ids from the person_ids field
 556         if oldRecord:
 557             oldIdList = oldRecord.get("person_ids", [])
 558             containerId = oldRecord.get_pointer()
 559         else:
 560             # if oldRecord==None, then we are doing a Register, instead of an
 561             # update.
 562             oldIdList = []
 563             containerId = record.get_pointer()
 564
 565     # add people who are in the new list, but not the oldList
 566         for personId in newIdList:
 567             if not (personId in oldIdList):
 568                 addFunc(self.plauth, personId, containerId)
 569
 570         # remove people who are in the old list, but not the new list
 571         for personId in oldIdList:
 572             if not (personId in newIdList):
 573                 delFunc(self.plauth, personId, containerId)
 574
 575     def update_membership(self, oldRecord, record):
 576         if record.type == "slice":
 577             self.update_membership_list(oldRecord, record, 'researcher',
 578                                         self.plshell.AddPersonToSlice,
 579                                         self.plshell.DeletePersonFromSlice)
 580         elif record.type == "authority":
 581             # xxx TODO
 582             pass
 583
 584
 585
 586 class ComponentAPI(BaseAPI):
 587
 588     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8", methods='sfa.methods',
 589                  peer_cert = None, interface = None, key_file = None, cert_file = None):
 590
 591         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, peer_cert=peer_cert,
 592                          interface=interface, key_file=key_file, cert_file=cert_file)
 593         self.encoding = encoding
 594
 595         # Better just be documenting the API
 596         if config is None:
 597             return
 598
 599         self.nodemanager = NodeManager(self.config)
 600
 601     def sliver_exists(self):
 602         sliver_dict = self.nodemanager.GetXIDs()
 603         if slicename in sliver_dict.keys():
 604             return True
 605         else:
 606             return False
 607
 608     def get_registry(self):
 609         addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
 610         url = "http://%(addr)s:%(port)s" % locals()
 611         server = xmlrpcprotocol.get_server(url, self.key_file, self.cert_file)
 612         return server
 613
 614     def get_node_key(self):
 615         # this call requires no authentication,
 616         # so we can generate a random keypair here
 617         subject="component"
 618         (kfd, keyfile) = tempfile.mkstemp()
 619         (cfd, certfile) = tempfile.mkstemp()
 620         key = Keypair(create=True)
 621         key.save_to_file(keyfile)
 622         cert = Certificate(subject=subject)
 623         cert.set_issuer(key=key, subject=subject)
 624         cert.set_pubkey(key)
 625         cert.sign()
 626         cert.save_to_file(certfile)
 627         registry = self.get_registry()
 628         # the registry will scp the key onto the node
 629         registry.get_key()
 630
 631     def getCredential(self):
 632         """
 633         Get our credential from a remote registry
 634         """
 635         path = self.config.SFA_DATA_DIR
 636         config_dir = self.config.config_path
 637         cred_filename = path + os.sep + 'node.cred'
 638         try:
 639             credential = Credential(filename = cred_filename)
 640             return credential.save_to_string(save_parents=True)
 641         except IOError:
 642             node_pkey_file = config_dir + os.sep + "node.key"
 643             node_gid_file = config_dir + os.sep + "node.gid"
 644             cert_filename = path + os.sep + 'server.cert'
 645             if not os.path.exists(node_pkey_file) or \
 646                not os.path.exists(node_gid_file):
 647                 self.get_node_key()
 648
 649             # get node's hrn
 650             gid = GID(filename=node_gid_file)
 651             hrn = gid.get_hrn()
 652             # get credential from registry
 653             cert_str = Certificate(filename=cert_filename).save_to_string(save_parents=True)
 654             registry = self.get_registry()
 655             cred = registry.GetSelfCredential(cert_str, hrn, 'node')
 656             Credential(string=cred).save_to_file(credfile, save_parents=True)
 657
 658             return cred
 659
 660     def clean_key_cred(self):
 661         """
 662         remove the existing keypair and cred  and generate new ones
 663         """
 664         files = ["server.key", "server.cert", "node.cred"]
 665         for f in files:
 666             filepath = KEYDIR + os.sep + f
 667             if os.path.isfile(filepath):
 668                 os.unlink(f)
 669
 670         # install the new key pair
 671         # GetCredential will take care of generating the new keypair
 672         # and credential
 673         self.get_node_key()
 674         self.getCredential()
 675
 676