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