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
  14 import sfa.util.sfalogging
  15 import sfa.util.xmlrpcprotocol as xmlrpcprotocol
  16 from sfa.trust.auth import Auth
  17 from sfa.util.config import *
  18 from sfa.util.faults import *
  19 from sfa.util.debug import *
  20 from sfa.trust.rights import *
  21 from sfa.trust.credential import *
  22 from sfa.trust.certificate import *
  23 from sfa.util.namespace import *
  24 from sfa.util.api import *
  25 from sfa.util.nodemanager import NodeManager
  26 try:
  27     from collections import defaultdict
  28 except:
  29     class defaultdict(dict):
  30         def __init__(self, default_factory=None, *a, **kw):
  31             if (default_factory is not None and
  32                 not hasattr(default_factory, '__call__')):
  33                 raise TypeError('first argument must be callable')
  34             dict.__init__(self, *a, **kw)
  35             self.default_factory = default_factory
  36         def __getitem__(self, key):
  37             try:
  38                 return dict.__getitem__(self, key)
  39             except KeyError:
  40                 return self.__missing__(key)
  41         def __missing__(self, key):
  42             if self.default_factory is None:
  43                 raise KeyError(key)
  44             self[key] = value = self.default_factory()
  45             return value
  46         def __reduce__(self):
  47             if self.default_factory is None:
  48                 args = tuple()
  49             else:
  50                 args = self.default_factory,
  51             return type(self), args, None, None, self.items()
  52         def copy(self):
  53             return self.__copy__()
  54         def __copy__(self):
  55             return type(self)(self.default_factory, self)
  56         def __deepcopy__(self, memo):
  57             import copy
  58             return type(self)(self.default_factory,
  59                               copy.deepcopy(self.items()))
  60         def __repr__(self):
  61             return 'defaultdict(%s, %s)' % (self.default_factory,
  62                                             dict.__repr__(self))
  63 ## end of http://code.activestate.com/recipes/523034/ }}}
  64
  65 def list_to_dict(recs, key):
  66     """
  67     convert a list of dictionaries into a dictionary keyed on the
  68     specified dictionary key
  69     """
  70     keys = [rec[key] for rec in recs]
  71     return dict(zip(keys, recs))
  72
  73 class SfaAPI(BaseAPI):
  74
  75     # flat list of method names
  76     import sfa.methods
  77     methods = sfa.methods.all
  78
  79     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8",
  80                  methods='sfa.methods', peer_cert = None, interface = None,
  81                 key_file = None, cert_file = None, cache = None):
  82         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, \
  83                          peer_cert=peer_cert, interface=interface, key_file=key_file, \
  84                          cert_file=cert_file, cache=cache)
  85
  86         self.encoding = encoding
  87         from sfa.util.table import SfaTable
  88         self.SfaTable = SfaTable
  89         # Better just be documenting the API
  90         if config is None:
  91             return
  92
  93         # Load configuration
  94         self.config = Config(config)
  95         self.auth = Auth(peer_cert)
  96         self.interface = interface
  97         self.key_file = key_file
  98         self.key = Keypair(filename=self.key_file)
  99         self.cert_file = cert_file
 100         self.cert = Certificate(filename=self.cert_file)
 101         self.credential = None
 102         # Initialize the PLC shell only if SFA wraps a myPLC
 103         rspec_type = self.config.get_aggregate_type()
 104         if (rspec_type == 'pl' or rspec_type == 'vini' or rspec_type == 'eucalyptus'):
 105             self.plshell = self.getPLCShell()
 106             self.plshell_version = "4.3"
 107
 108         self.hrn = self.config.SFA_INTERFACE_HRN
 109         self.time_format = "%Y-%m-%d %H:%M:%S"
 110         self.logger=sfa.util.sfalogging.logger
 111
 112     def getPLCShell(self):
 113         self.plauth = {'Username': self.config.SFA_PLC_USER,
 114                        'AuthMethod': 'password',
 115                        'AuthString': self.config.SFA_PLC_PASSWORD}
 116         try:
 117             sys.path.append(os.path.dirname(os.path.realpath("/usr/bin/plcsh")))
 118             self.plshell_type = 'direct'
 119             import PLC.Shell
 120             shell = PLC.Shell.Shell(globals = globals())
 121         except:
 122             self.plshell_type = 'xmlrpc'
 123             url = self.config.SFA_PLC_URL
 124             shell = xmlrpclib.Server(url, verbose = 0, allow_none = True)
 125
 126         return shell
 127
 128     def getCredential(self):
 129         """
 130         Retrun a valid credential for this interface.
 131         """
 132         if self.interface in ['registry']:
 133             return self.getCredentialFromLocalRegistry()
 134         else:
 135             return self.getCredentialFromRegistry()
 136
 137     def getDelegatedCredential(self, creds):
 138         """
 139         Attempt to find a credential delegated to us in
 140         the specified list of creds.
 141         """
 142         if creds and not isinstance(creds, list):
 143             creds = [creds]
 144         delegated_creds = filter_creds_by_caller(creds,self.hrn)
 145         if not delegated_creds:
 146             return None
 147         return delegated_creds[0]
 148
 149     def getCredentialFromRegistry(self):
 150         """
 151         Get our credential from a remote registry
 152         """
 153         type = 'authority'
 154         path = self.config.SFA_DATA_DIR
 155         filename = ".".join([self.interface, self.hrn, type, "cred"])
 156         cred_filename = path + os.sep + filename
 157         try:
 158             credential = Credential(filename = cred_filename)
 159             return credential.save_to_string(save_parents=True)
 160         except IOError:
 161             from sfa.server.registry import Registries
 162             registries = Registries(self)
 163             registry = registries[self.hrn]
 164             cert_string=self.cert.save_to_string(save_parents=True)
 165             # get self credential
 166             self_cred = registry.get_self_credential(cert_string, type, self.hrn)
 167             # get credential
 168             cred = registry.get_credential(self_cred, type, self.hrn)
 169
 170             # save cred to file
 171             Credential(string=cred).save_to_file(cred_filename, save_parents=True)
 172             return cred
 173
 174     def getCredentialFromLocalRegistry(self):
 175         """
 176         Get our current credential directly from the local registry.
 177         """
 178
 179         hrn = self.hrn
 180         auth_hrn = self.auth.get_authority(hrn)
 181
 182         # is this a root or sub authority
 183         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 184             auth_hrn = hrn
 185         auth_info = self.auth.get_auth_info(auth_hrn)
 186         table = self.SfaTable()
 187         records = table.findObjects(hrn)
 188         if not records:
 189             raise RecordNotFound
 190         record = records[0]
 191         type = record['type']
 192         object_gid = record.get_gid_object()
 193         new_cred = Credential(subject = object_gid.get_subject())
 194         new_cred.set_gid_caller(object_gid)
 195         new_cred.set_gid_object(object_gid)
 196         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 197
 198         r1 = determine_rights(type, hrn)
 199         new_cred.set_privileges(r1)
 200
 201         auth_kind = "authority,ma,sa"
 202
 203         new_cred.set_parent(self.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
 204
 205         new_cred.encode()
 206         new_cred.sign()
 207
 208         return new_cred.save_to_string(save_parents=True)
 209
 210
 211     def loadCredential (self):
 212         """
 213         Attempt to load credential from file if it exists. If it doesnt get
 214         credential from registry.
 215         """
 216
 217         # see if this file exists
 218         # XX This is really the aggregate's credential. Using this is easier than getting
 219         # the registry's credential from iteslf (ssl errors).
 220         ma_cred_filename = self.config.SFA_DATA_DIR + os.sep + self.interface + self.hrn + ".ma.cred"
 221         try:
 222             self.credential = Credential(filename = ma_cred_filename)
 223         except IOError:
 224             self.credential = self.getCredentialFromRegistry()
 225
 226     ##
 227     # Convert SFA fields to PLC fields for use when registering up updating
 228     # registry record in the PLC database
 229     #
 230     # @param type type of record (user, slice, ...)
 231     # @param hrn human readable name
 232     # @param sfa_fields dictionary of SFA fields
 233     # @param pl_fields dictionary of PLC fields (output)
 234
 235     def sfa_fields_to_pl_fields(self, type, hrn, record):
 236
 237         def convert_ints(tmpdict, int_fields):
 238             for field in int_fields:
 239                 if field in tmpdict:
 240                     tmpdict[field] = int(tmpdict[field])
 241
 242         pl_record = {}
 243         #for field in record:
 244         #    pl_record[field] = record[field]
 245
 246         if type == "slice":
 247             if not "instantiation" in pl_record:
 248                 pl_record["instantiation"] = "plc-instantiated"
 249             pl_record["name"] = hrn_to_pl_slicename(hrn)
 250             if "url" in record:
 251                pl_record["url"] = record["url"]
 252             if "description" in record:
 253                 pl_record["description"] = record["description"]
 254             if "expires" in record:
 255                 pl_record["expires"] = int(record["expires"])
 256
 257         elif type == "node":
 258             if not "hostname" in pl_record:
 259                 if not "hostname" in record:
 260                     raise MissingSfaInfo("hostname")
 261                 pl_record["hostname"] = record["hostname"]
 262             if not "model" in pl_record:
 263                 pl_record["model"] = "geni"
 264
 265         elif type == "authority":
 266             pl_record["login_base"] = hrn_to_pl_login_base(hrn)
 267
 268             if not "name" in pl_record:
 269                 pl_record["name"] = hrn
 270
 271             if not "abbreviated_name" in pl_record:
 272                 pl_record["abbreviated_name"] = hrn
 273
 274             if not "enabled" in pl_record:
 275                 pl_record["enabled"] = True
 276
 277             if not "is_public" in pl_record:
 278                 pl_record["is_public"] = True
 279
 280         return pl_record
 281
 282     def fill_record_pl_info(self, records):
 283         """
 284         Fill in the planetlab specific fields of a SFA record. This
 285         involves calling the appropriate PLC method to retrieve the
 286         database record for the object.
 287
 288         PLC data is filled into the pl_info field of the record.
 289
 290         @param record: record to fill in field (in/out param)
 291         """
 292         # get ids by type
 293         node_ids, site_ids, slice_ids = [], [], []
 294         person_ids, key_ids = [], []
 295         type_map = {'node': node_ids, 'authority': site_ids,
 296                     'slice': slice_ids, 'user': person_ids}
 297
 298         for record in records:
 299             for type in type_map:
 300                 if type == record['type']:
 301                     type_map[type].append(record['pointer'])
 302
 303         # get pl records
 304         nodes, sites, slices, persons, keys = {}, {}, {}, {}, {}
 305         if node_ids:
 306             node_list = self.plshell.GetNodes(self.plauth, node_ids)
 307             nodes = list_to_dict(node_list, 'node_id')
 308         if site_ids:
 309             site_list = self.plshell.GetSites(self.plauth, site_ids)
 310             sites = list_to_dict(site_list, 'site_id')
 311         if slice_ids:
 312             slice_list = self.plshell.GetSlices(self.plauth, slice_ids)
 313             slices = list_to_dict(slice_list, 'slice_id')
 314         if person_ids:
 315             person_list = self.plshell.GetPersons(self.plauth, person_ids)
 316             persons = list_to_dict(person_list, 'person_id')
 317             for person in persons:
 318                 key_ids.extend(persons[person]['key_ids'])
 319
 320         pl_records = {'node': nodes, 'authority': sites,
 321                       'slice': slices, 'user': persons}
 322
 323         if key_ids:
 324             key_list = self.plshell.GetKeys(self.plauth, key_ids)
 325             keys = list_to_dict(key_list, 'key_id')
 326
 327         # fill record info
 328         for record in records:
 329             # records with pointer==-1 do not have plc info.
 330             # for example, the top level authority records which are
 331             # authorities, but not PL "sites"
 332             if record['pointer'] == -1:
 333                 continue
 334
 335             for type in pl_records:
 336                 if record['type'] == type:
 337                     if record['pointer'] in pl_records[type]:
 338                         record.update(pl_records[type][record['pointer']])
 339                         break
 340             # fill in key info
 341             if record['type'] == 'user':
 342                 pubkeys = [keys[key_id]['key'] for key_id in record['key_ids'] if key_id in keys]
 343                 record['keys'] = pubkeys
 344
 345         # fill in record hrns
 346         records = self.fill_record_hrns(records)
 347
 348         return records
 349
 350     def fill_record_hrns(self, records):
 351         """
 352         convert pl ids to hrns
 353         """
 354
 355         # get ids
 356         slice_ids, person_ids, site_ids, node_ids = [], [], [], []
 357         for record in records:
 358             if 'site_id' in record:
 359                 site_ids.append(record['site_id'])
 360             if 'site_ids' in records:
 361                 site_ids.extend(record['site_ids'])
 362             if 'person_ids' in record:
 363                 person_ids.extend(record['person_ids'])
 364             if 'slice_ids' in record:
 365                 slice_ids.extend(record['slice_ids'])
 366             if 'node_ids' in record:
 367                 node_ids.extend(record['node_ids'])
 368
 369         # get pl records
 370         slices, persons, sites, nodes = {}, {}, {}, {}
 371         if site_ids:
 372             site_list = self.plshell.GetSites(self.plauth, site_ids, ['site_id', 'login_base'])
 373             sites = list_to_dict(site_list, 'site_id')
 374         if person_ids:
 375             person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'email'])
 376             persons = list_to_dict(person_list, 'person_id')
 377         if slice_ids:
 378             slice_list = self.plshell.GetSlices(self.plauth, slice_ids, ['slice_id', 'name'])
 379             slices = list_to_dict(slice_list, 'slice_id')
 380         if node_ids:
 381             node_list = self.plshell.GetNodes(self.plauth, node_ids, ['node_id', 'hostname'])
 382             nodes = list_to_dict(node_list, 'node_id')
 383
 384         # convert ids to hrns
 385         for record in records:
 386
 387             # get all relevant data
 388             type = record['type']
 389             pointer = record['pointer']
 390             auth_hrn = self.hrn
 391             login_base = ''
 392             if pointer == -1:
 393                 continue
 394
 395             if 'site_id' in record:
 396                 site = sites[record['site_id']]
 397                 login_base = site['login_base']
 398                 record['site'] = ".".join([auth_hrn, login_base])
 399             if 'person_ids' in record:
 400                 emails = [persons[person_id]['email'] for person_id in record['person_ids'] \
 401                           if person_id in  persons]
 402                 usernames = [email.split('@')[0] for email in emails]
 403                 person_hrns = [".".join([auth_hrn, login_base, username]) for username in usernames]
 404                 record['persons'] = person_hrns
 405             if 'slice_ids' in record:
 406                 slicenames = [slices[slice_id]['name'] for slice_id in record['slice_ids'] \
 407                               if slice_id in slices]
 408                 slice_hrns = [slicename_to_hrn(auth_hrn, slicename) for slicename in slicenames]
 409                 record['slices'] = slice_hrns
 410             if 'node_ids' in record:
 411                 hostnames = [nodes[node_id]['hostname'] for node_id in record['node_ids'] \
 412                              if node_id in nodes]
 413                 node_hrns = [hostname_to_hrn(auth_hrn, login_base, hostname) for hostname in hostnames]
 414                 record['nodes'] = node_hrns
 415             if 'site_ids' in record:
 416                 login_bases = [sites[site_id]['login_base'] for site_id in record['site_ids'] \
 417                                if site_id in sites]
 418                 site_hrns = [".".join([auth_hrn, lbase]) for lbase in login_bases]
 419                 record['sites'] = site_hrns
 420
 421         return records
 422
 423     def fill_record_sfa_info(self, records):
 424
 425         def startswith(prefix, values):
 426             return [value for value in values if value.startswith(prefix)]
 427
 428         # get person ids
 429         person_ids = []
 430         site_ids = []
 431         for record in records:
 432             person_ids.extend(record.get("person_ids", []))
 433             site_ids.extend(record.get("site_ids", []))
 434             if 'site_id' in record:
 435                 site_ids.append(record['site_id'])
 436
 437         # get all pis from the sites we've encountered
 438         # and store them in a dictionary keyed on site_id
 439         site_pis = {}
 440         if site_ids:
 441             pi_filter = {'|roles': ['pi'], '|site_ids': site_ids}
 442             pi_list = self.plshell.GetPersons(self.plauth, pi_filter, ['person_id', 'site_ids'])
 443             for pi in pi_list:
 444                 # we will need the pi's hrns also
 445                 person_ids.append(pi['person_id'])
 446
 447                 # we also need to keep track of the sites these pis
 448                 # belong to
 449                 for site_id in pi['site_ids']:
 450                     if site_id in site_pis:
 451                         site_pis[site_id].append(pi)
 452                     else:
 453                         site_pis[site_id] = [pi]
 454
 455         # get sfa records for all records associated with these records.
 456         # we'll replace pl ids (person_ids) with hrns from the sfa records
 457         # we obtain
 458
 459         # get the sfa records
 460         table = self.SfaTable()
 461         person_list, persons = [], {}
 462         person_list = table.find({'type': 'user', 'pointer': person_ids})
 463         # create a hrns keyed on the sfa record's pointer.
 464         # Its possible for  multiple records to have the same pointer so
 465         # the dict's value will be a list of hrns.
 466         persons = defaultdict(list)
 467         for person in person_list:
 468             persons[person['pointer']].append(person)
 469
 470         # get the pl records
 471         pl_person_list, pl_persons = [], {}
 472         pl_person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'roles'])
 473         pl_persons = list_to_dict(pl_person_list, 'person_id')
 474
 475         # fill sfa info
 476         for record in records:
 477             # skip records with no pl info (top level authorities)
 478             if record['pointer'] == -1:
 479                 continue
 480             sfa_info = {}
 481             type = record['type']
 482             if (type == "slice"):
 483                 # all slice users are researchers
 484                 record['PI'] = []
 485                 record['researcher'] = []
 486                 for person_id in record['person_ids']:
 487                     hrns = [person['hrn'] for person in persons[person_id]]
 488                     record['researcher'].extend(hrns)
 489
 490                 # pis at the slice's site
 491                 pl_pis = site_pis[record['site_id']]
 492                 pi_ids = [pi['person_id'] for pi in pl_pis]
 493                 for person_id in pi_ids:
 494                     hrns = [person['hrn'] for person in persons[person_id]]
 495                     record['PI'].extend(hrns)
 496                 record['geni_urn'] = hrn_to_urn(record['hrn'], 'slice')
 497                 record['geni_creator'] = record['PI']
 498
 499             elif (type == "authority"):
 500                 record['PI'] = []
 501                 record['operator'] = []
 502                 record['owner'] = []
 503                 for pointer in record['person_ids']:
 504                     if pointer not in persons or pointer not in pl_persons:
 505                         # this means there is not sfa or pl record for this user
 506                         continue
 507                     hrns = [person['hrn'] for person in persons[pointer]]
 508                     roles = pl_persons[pointer]['roles']
 509                     if 'pi' in roles:
 510                         record['PI'].extend(hrns)
 511                     if 'tech' in roles:
 512                         record['operator'].extend(hrns)
 513                     if 'admin' in roles:
 514                         record['owner'].extend(hrns)
 515                     # xxx TODO: OrganizationName
 516             elif (type == "node"):
 517                 sfa_info['dns'] = record.get("hostname", "")
 518                 # xxx TODO: URI, LatLong, IP, DNS
 519
 520             elif (type == "user"):
 521                 sfa_info['email'] = record.get("email", "")
 522                 sfa_info['geni_urn'] = hrn_to_urn(record['hrn'], 'user')
 523                 sfa_info['geni_certificate'] = record['gid']
 524                 # xxx TODO: PostalAddress, Phone
 525             record.update(sfa_info)
 526
 527     def fill_record_info(self, records):
 528         """
 529         Given a SFA record, fill in the PLC specific and SFA specific
 530         fields in the record.
 531         """
 532         if not isinstance(records, list):
 533             records = [records]
 534
 535         self.fill_record_pl_info(records)
 536         self.fill_record_sfa_info(records)
 537
 538     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 539         # get a list of the HRNs tht are members of the old and new records
 540         if oldRecord:
 541             oldList = oldRecord.get(listName, [])
 542         else:
 543             oldList = []
 544         newList = record.get(listName, [])
 545
 546         # if the lists are the same, then we don't have to update anything
 547         if (oldList == newList):
 548             return
 549
 550         # build a list of the new person ids, by looking up each person to get
 551         # their pointer
 552         newIdList = []
 553         table = self.SfaTable()
 554         records = table.find({'type': 'user', 'hrn': newList})
 555         for rec in records:
 556             newIdList.append(rec['pointer'])
 557
 558         # build a list of the old person ids from the person_ids field
 559         if oldRecord:
 560             oldIdList = oldRecord.get("person_ids", [])
 561             containerId = oldRecord.get_pointer()
 562         else:
 563             # if oldRecord==None, then we are doing a Register, instead of an
 564             # update.
 565             oldIdList = []
 566             containerId = record.get_pointer()
 567
 568     # add people who are in the new list, but not the oldList
 569         for personId in newIdList:
 570             if not (personId in oldIdList):
 571                 addFunc(self.plauth, personId, containerId)
 572
 573         # remove people who are in the old list, but not the new list
 574         for personId in oldIdList:
 575             if not (personId in newIdList):
 576                 delFunc(self.plauth, personId, containerId)
 577
 578     def update_membership(self, oldRecord, record):
 579         if record.type == "slice":
 580             self.update_membership_list(oldRecord, record, 'researcher',
 581                                         self.plshell.AddPersonToSlice,
 582                                         self.plshell.DeletePersonFromSlice)
 583         elif record.type == "authority":
 584             # xxx TODO
 585             pass
 586
 587
 588
 589 class ComponentAPI(BaseAPI):
 590
 591     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8", methods='sfa.methods',
 592                  peer_cert = None, interface = None, key_file = None, cert_file = None):
 593
 594         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, peer_cert=peer_cert,
 595                          interface=interface, key_file=key_file, cert_file=cert_file)
 596         self.encoding = encoding
 597
 598         # Better just be documenting the API
 599         if config is None:
 600             return
 601
 602         self.nodemanager = NodeManager(self.config)
 603
 604     def sliver_exists(self):
 605         sliver_dict = self.nodemanager.GetXIDs()
 606         if slicename in sliver_dict.keys():
 607             return True
 608         else:
 609             return False
 610
 611     def get_registry(self):
 612         addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
 613         url = "http://%(addr)s:%(port)s" % locals()
 614         server = xmlrpcprotocol.get_server(url, self.key_file, self.cert_file)
 615         return server
 616
 617     def get_node_key(self):
 618         # this call requires no authentication,
 619         # so we can generate a random keypair here
 620         subject="component"
 621         (kfd, keyfile) = tempfile.mkstemp()
 622         (cfd, certfile) = tempfile.mkstemp()
 623         key = Keypair(create=True)
 624         key.save_to_file(keyfile)
 625         cert = Certificate(subject=subject)
 626         cert.set_issuer(key=key, subject=subject)
 627         cert.set_pubkey(key)
 628         cert.sign()
 629         cert.save_to_file(certfile)
 630         registry = self.get_registry()
 631         # the registry will scp the key onto the node
 632         registry.get_key()
 633
 634     def getCredential(self):
 635         """
 636         Get our credential from a remote registry
 637         """
 638         path = self.config.SFA_DATA_DIR
 639         config_dir = self.config.config_path
 640         cred_filename = path + os.sep + 'node.cred'
 641         try:
 642             credential = Credential(filename = cred_filename)
 643             return credential.save_to_string(save_parents=True)
 644         except IOError:
 645             node_pkey_file = config_dir + os.sep + "node.key"
 646             node_gid_file = config_dir + os.sep + "node.gid"
 647             cert_filename = path + os.sep + 'server.cert'
 648             if not os.path.exists(node_pkey_file) or \
 649                not os.path.exists(node_gid_file):
 650                 self.get_node_key()
 651
 652             # get node's hrn
 653             gid = GID(filename=node_gid_file)
 654             hrn = gid.get_hrn()
 655             # get credential from registry
 656             cert_str = Certificate(filename=cert_filename).save_to_string(save_parents=True)
 657             registry = self.get_registry()
 658             cred = registry.get_self_credential(cert_str, 'node', hrn)
 659             Credential(string=cred).save_to_file(credfile, save_parents=True)
 660
 661             return cred
 662
 663     def clean_key_cred(self):
 664         """
 665         remove the existing keypair and cred  and generate new ones
 666         """
 667         files = ["server.key", "server.cert", "node.cred"]
 668         for f in files:
 669             filepath = KEYDIR + os.sep + f
 670             if os.path.isfile(filepath):
 671                 os.unlink(f)
 672
 673         # install the new key pair
 674         # get_credential will take care of generating the new keypair
 675         # and credential
 676         self.get_node_key()
 677         self.getCredential()
 678
 679