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 datetime
  10 import xmlrpclib
  11
  12 from sfa.util.faults import *
  13 from sfa.util.api import *
  14 from sfa.util.config import *
  15 from sfa.util.sfalogging import logger
  16 import sfa.util.xmlrpcprotocol as xmlrpcprotocol
  17 from sfa.trust.auth import Auth
  18 from sfa.trust.rights import Right, Rights, determine_rights
  19 from sfa.trust.credential import Credential,Keypair
  20 from sfa.trust.certificate import Certificate
  21 from sfa.util.xrn import get_authority, hrn_to_urn
  22 from sfa.util.plxrn import hostname_to_hrn, hrn_to_pl_slicename, hrn_to_pl_slicename, slicename_to_hrn
  23 from sfa.util.nodemanager import NodeManager
  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 \
 103             rspec_type == 'eucalyptus' or rspec_type == 'max'):
 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
 110     def getPLCShell(self):
 111         self.plauth = {'Username': self.config.SFA_PLC_USER,
 112                        'AuthMethod': 'password',
 113                        'AuthString': self.config.SFA_PLC_PASSWORD}
 114
 115         # The native shell (PLC.Shell.Shell) is more efficient than xmlrpc,
 116         # but it leaves idle db connections open. use xmlrpc until we can figure
 117         # out why PLC.Shell.Shell doesn't close db connection properly
 118         #try:
 119         #    sys.path.append(os.path.dirname(os.path.realpath("/usr/bin/plcsh")))
 120         #    self.plshell_type = 'direct'
 121         #    import PLC.Shell
 122         #    shell = PLC.Shell.Shell(globals = globals())
 123         #except:
 124
 125         self.plshell_type = 'xmlrpc'
 126         url = self.config.SFA_PLC_URL
 127         shell = xmlrpclib.Server(url, verbose = 0, allow_none = True)
 128         return shell
 129
 130     def getCredential(self):
 131         """
 132         Return a valid credential for this interface.
 133         """
 134         type = 'authority'
 135         path = self.config.SFA_DATA_DIR
 136         filename = ".".join([self.interface, self.hrn, type, "cred"])
 137         cred_filename = path + os.sep + filename
 138         cred = None
 139         if os.path.isfile(cred_filename):
 140             cred = Credential(filename = cred_filename)
 141             # make sure cred isnt expired
 142             if not cred.get_expiration or \
 143                datetime.datetime.today() < cred.get_expiration():
 144                 return cred.save_to_string(save_parents=True)
 145
 146         # get a new credential
 147         if self.interface in ['registry']:
 148             cred =  self.__getCredentialRaw()
 149         else:
 150             cred =  self.__getCredential()
 151         cred.save_to_file(cred_filename, save_parents=True)
 152
 153         return cred.save_to_string(save_parents=True)
 154
 155
 156     def getDelegatedCredential(self, creds):
 157         """
 158         Attempt to find a credential delegated to us in
 159         the specified list of creds.
 160         """
 161         if creds and not isinstance(creds, list):
 162             creds = [creds]
 163         delegated_creds = filter_creds_by_caller(creds,self.hrn)
 164         if not delegated_creds:
 165             return None
 166         return delegated_creds[0]
 167
 168     def __getCredential(self):
 169         """
 170         Get our credential from a remote registry
 171         """
 172         from sfa.server.registry import Registries
 173         registries = Registries(self)
 174         registry = registries[self.hrn]
 175         cert_string=self.cert.save_to_string(save_parents=True)
 176         # get self credential
 177         self_cred = registry.GetSelfCredential(cert_string, self.hrn, 'authority')
 178         # get credential
 179         cred = registry.GetCredential(self_cred, self.hrn, 'authority')
 180         return Credential(string=cred)
 181
 182     def __getCredentialRaw(self):
 183         """
 184         Get our current credential directly from the local registry.
 185         """
 186
 187         hrn = self.hrn
 188         auth_hrn = self.auth.get_authority(hrn)
 189
 190         # is this a root or sub authority
 191         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 192             auth_hrn = hrn
 193         auth_info = self.auth.get_auth_info(auth_hrn)
 194         table = self.SfaTable()
 195         records = table.findObjects({'hrn': hrn, 'type': 'authority+sa'})
 196         if not records:
 197             raise RecordNotFound
 198         record = records[0]
 199         type = record['type']
 200         object_gid = record.get_gid_object()
 201         new_cred = Credential(subject = object_gid.get_subject())
 202         new_cred.set_gid_caller(object_gid)
 203         new_cred.set_gid_object(object_gid)
 204         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 205
 206         r1 = determine_rights(type, hrn)
 207         new_cred.set_privileges(r1)
 208         new_cred.encode()
 209         new_cred.sign()
 210
 211         return new_cred
 212
 213
 214     def loadCredential (self):
 215         """
 216         Attempt to load credential from file if it exists. If it doesnt get
 217         credential from registry.
 218         """
 219
 220         # see if this file exists
 221         # XX This is really the aggregate's credential. Using this is easier than getting
 222         # the registry's credential from iteslf (ssl errors).
 223         ma_cred_filename = self.config.SFA_DATA_DIR + os.sep + self.interface + self.hrn + ".ma.cred"
 224         try:
 225             self.credential = Credential(filename = ma_cred_filename)
 226         except IOError:
 227             self.credential = self.getCredentialFromRegistry()
 228
 229     ##
 230     # Convert SFA fields to PLC fields for use when registering up updating
 231     # registry record in the PLC database
 232     #
 233     # @param type type of record (user, slice, ...)
 234     # @param hrn human readable name
 235     # @param sfa_fields dictionary of SFA fields
 236     # @param pl_fields dictionary of PLC fields (output)
 237
 238     def sfa_fields_to_pl_fields(self, type, hrn, record):
 239
 240         def convert_ints(tmpdict, int_fields):
 241             for field in int_fields:
 242                 if field in tmpdict:
 243                     tmpdict[field] = int(tmpdict[field])
 244
 245         pl_record = {}
 246         #for field in record:
 247         #    pl_record[field] = record[field]
 248
 249         if type == "slice":
 250             if not "instantiation" in pl_record:
 251                 pl_record["instantiation"] = "plc-instantiated"
 252             pl_record["name"] = hrn_to_pl_slicename(hrn)
 253             if "url" in record:
 254                pl_record["url"] = record["url"]
 255             if "description" in record:
 256                 pl_record["description"] = record["description"]
 257             if "expires" in record:
 258                 pl_record["expires"] = int(record["expires"])
 259
 260         elif type == "node":
 261             if not "hostname" in pl_record:
 262                 if not "hostname" in record:
 263                     raise MissingSfaInfo("hostname")
 264                 pl_record["hostname"] = record["hostname"]
 265             if not "model" in pl_record:
 266                 pl_record["model"] = "geni"
 267
 268         elif type == "authority":
 269             pl_record["login_base"] = hrn_to_pl_login_base(hrn)
 270
 271             if not "name" in pl_record:
 272                 pl_record["name"] = hrn
 273
 274             if not "abbreviated_name" in pl_record:
 275                 pl_record["abbreviated_name"] = hrn
 276
 277             if not "enabled" in pl_record:
 278                 pl_record["enabled"] = True
 279
 280             if not "is_public" in pl_record:
 281                 pl_record["is_public"] = True
 282
 283         return pl_record
 284
 285     def fill_record_pl_info(self, records):
 286         """
 287         Fill in the planetlab specific fields of a SFA record. This
 288         involves calling the appropriate PLC method to retrieve the
 289         database record for the object.
 290
 291         PLC data is filled into the pl_info field of the record.
 292
 293         @param record: record to fill in field (in/out param)
 294         """
 295         # get ids by type
 296         node_ids, site_ids, slice_ids = [], [], []
 297         person_ids, key_ids = [], []
 298         type_map = {'node': node_ids, 'authority': site_ids,
 299                     'slice': slice_ids, 'user': person_ids}
 300
 301         for record in records:
 302             for type in type_map:
 303                 if type == record['type']:
 304                     type_map[type].append(record['pointer'])
 305
 306         # get pl records
 307         nodes, sites, slices, persons, keys = {}, {}, {}, {}, {}
 308         if node_ids:
 309             node_list = self.plshell.GetNodes(self.plauth, node_ids)
 310             nodes = list_to_dict(node_list, 'node_id')
 311         if site_ids:
 312             site_list = self.plshell.GetSites(self.plauth, site_ids)
 313             sites = list_to_dict(site_list, 'site_id')
 314         if slice_ids:
 315             slice_list = self.plshell.GetSlices(self.plauth, slice_ids)
 316             slices = list_to_dict(slice_list, 'slice_id')
 317         if person_ids:
 318             person_list = self.plshell.GetPersons(self.plauth, person_ids)
 319             persons = list_to_dict(person_list, 'person_id')
 320             for person in persons:
 321                 key_ids.extend(persons[person]['key_ids'])
 322
 323         pl_records = {'node': nodes, 'authority': sites,
 324                       'slice': slices, 'user': persons}
 325
 326         if key_ids:
 327             key_list = self.plshell.GetKeys(self.plauth, key_ids)
 328             keys = list_to_dict(key_list, 'key_id')
 329
 330         # fill record info
 331         for record in records:
 332             # records with pointer==-1 do not have plc info.
 333             # for example, the top level authority records which are
 334             # authorities, but not PL "sites"
 335             if record['pointer'] == -1:
 336                 continue
 337
 338             for type in pl_records:
 339                 if record['type'] == type:
 340                     if record['pointer'] in pl_records[type]:
 341                         record.update(pl_records[type][record['pointer']])
 342                         break
 343             # fill in key info
 344             if record['type'] == 'user':
 345                 if 'key_ids' not in record:
 346                     logger.info("user record has no 'key_ids' - need to import from myplc ?")
 347                 else:
 348                     pubkeys = [keys[key_id]['key'] for key_id in record['key_ids'] if key_id in keys]
 349                     record['keys'] = pubkeys
 350
 351         # fill in record hrns
 352         records = self.fill_record_hrns(records)
 353
 354         return records
 355
 356     def fill_record_hrns(self, records):
 357         """
 358         convert pl ids to hrns
 359         """
 360
 361         # get ids
 362         slice_ids, person_ids, site_ids, node_ids = [], [], [], []
 363         for record in records:
 364             if 'site_id' in record:
 365                 site_ids.append(record['site_id'])
 366             if 'site_ids' in records:
 367                 site_ids.extend(record['site_ids'])
 368             if 'person_ids' in record:
 369                 person_ids.extend(record['person_ids'])
 370             if 'slice_ids' in record:
 371                 slice_ids.extend(record['slice_ids'])
 372             if 'node_ids' in record:
 373                 node_ids.extend(record['node_ids'])
 374
 375         # get pl records
 376         slices, persons, sites, nodes = {}, {}, {}, {}
 377         if site_ids:
 378             site_list = self.plshell.GetSites(self.plauth, site_ids, ['site_id', 'login_base'])
 379             sites = list_to_dict(site_list, 'site_id')
 380         if person_ids:
 381             person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'email'])
 382             persons = list_to_dict(person_list, 'person_id')
 383         if slice_ids:
 384             slice_list = self.plshell.GetSlices(self.plauth, slice_ids, ['slice_id', 'name'])
 385             slices = list_to_dict(slice_list, 'slice_id')
 386         if node_ids:
 387             node_list = self.plshell.GetNodes(self.plauth, node_ids, ['node_id', 'hostname'])
 388             nodes = list_to_dict(node_list, 'node_id')
 389
 390         # convert ids to hrns
 391         for record in records:
 392             # get all relevant data
 393             type = record['type']
 394             pointer = record['pointer']
 395             auth_hrn = self.hrn
 396             login_base = ''
 397             if pointer == -1:
 398                 continue
 399
 400             if 'site_id' in record:
 401                 site = sites[record['site_id']]
 402                 login_base = site['login_base']
 403                 record['site'] = ".".join([auth_hrn, login_base])
 404             if 'person_ids' in record:
 405                 emails = [persons[person_id]['email'] for person_id in record['person_ids'] \
 406                           if person_id in  persons]
 407                 usernames = [email.split('@')[0] for email in emails]
 408                 person_hrns = [".".join([auth_hrn, login_base, username]) for username in usernames]
 409                 record['persons'] = person_hrns
 410             if 'slice_ids' in record:
 411                 slicenames = [slices[slice_id]['name'] for slice_id in record['slice_ids'] \
 412                               if slice_id in slices]
 413                 slice_hrns = [slicename_to_hrn(auth_hrn, slicename) for slicename in slicenames]
 414                 record['slices'] = slice_hrns
 415             if 'node_ids' in record:
 416                 hostnames = [nodes[node_id]['hostname'] for node_id in record['node_ids'] \
 417                              if node_id in nodes]
 418                 node_hrns = [hostname_to_hrn(auth_hrn, login_base, hostname) for hostname in hostnames]
 419                 record['nodes'] = node_hrns
 420             if 'site_ids' in record:
 421                 login_bases = [sites[site_id]['login_base'] for site_id in record['site_ids'] \
 422                                if site_id in sites]
 423                 site_hrns = [".".join([auth_hrn, lbase]) for lbase in login_bases]
 424                 record['sites'] = site_hrns
 425
 426         return records
 427
 428     def fill_record_sfa_info(self, records):
 429
 430         def startswith(prefix, values):
 431             return [value for value in values if value.startswith(prefix)]
 432
 433         # get person ids
 434         person_ids = []
 435         site_ids = []
 436         for record in records:
 437             person_ids.extend(record.get("person_ids", []))
 438             site_ids.extend(record.get("site_ids", []))
 439             if 'site_id' in record:
 440                 site_ids.append(record['site_id'])
 441
 442         # get all pis from the sites we've encountered
 443         # and store them in a dictionary keyed on site_id
 444         site_pis = {}
 445         if site_ids:
 446             pi_filter = {'|roles': ['pi'], '|site_ids': site_ids}
 447             pi_list = self.plshell.GetPersons(self.plauth, pi_filter, ['person_id', 'site_ids'])
 448             for pi in pi_list:
 449                 # we will need the pi's hrns also
 450                 person_ids.append(pi['person_id'])
 451
 452                 # we also need to keep track of the sites these pis
 453                 # belong to
 454                 for site_id in pi['site_ids']:
 455                     if site_id in site_pis:
 456                         site_pis[site_id].append(pi)
 457                     else:
 458                         site_pis[site_id] = [pi]
 459
 460         # get sfa records for all records associated with these records.
 461         # we'll replace pl ids (person_ids) with hrns from the sfa records
 462         # we obtain
 463
 464         # get the sfa records
 465         table = self.SfaTable()
 466         person_list, persons = [], {}
 467         person_list = table.find({'type': 'user', 'pointer': person_ids})
 468         # create a hrns keyed on the sfa record's pointer.
 469         # Its possible for  multiple records to have the same pointer so
 470         # the dict's value will be a list of hrns.
 471         persons = defaultdict(list)
 472         for person in person_list:
 473             persons[person['pointer']].append(person)
 474
 475         # get the pl records
 476         pl_person_list, pl_persons = [], {}
 477         pl_person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'roles'])
 478         pl_persons = list_to_dict(pl_person_list, 'person_id')
 479
 480         # fill sfa info
 481         for record in records:
 482             # skip records with no pl info (top level authorities)
 483             #if record['pointer'] == -1:
 484             #    continue
 485             sfa_info = {}
 486             type = record['type']
 487             if (type == "slice"):
 488                 # all slice users are researchers
 489                 record['geni_urn'] = hrn_to_urn(record['hrn'], 'slice')
 490                 record['PI'] = []
 491                 record['researcher'] = []
 492                 for person_id in record.get('person_ids', []):
 493                     hrns = [person['hrn'] for person in persons[person_id]]
 494                     record['researcher'].extend(hrns)
 495
 496                 # pis at the slice's site
 497                 if 'site_id' in record and record['site_id'] in site_pis:
 498                     pl_pis = site_pis[record['site_id']]
 499                     pi_ids = [pi['person_id'] for pi in pl_pis]
 500                     for person_id in pi_ids:
 501                         hrns = [person['hrn'] for person in persons[person_id]]
 502                         record['PI'].extend(hrns)
 503                         record['geni_creator'] = record['PI']
 504
 505             elif (type.startswith("authority")):
 506                 record['url'] = None
 507                 if record['hrn'] in self.aggregates:
 508                     record['url'] = self.aggregates[record['hrn']].url
 509
 510                 if record['pointer'] != -1:
 511                     record['PI'] = []
 512                     record['operator'] = []
 513                     record['owner'] = []
 514                     for pointer in record.get('person_ids', []):
 515                         if pointer not in persons or pointer not in pl_persons:
 516                             # this means there is not sfa or pl record for this user
 517                             continue
 518                         hrns = [person['hrn'] for person in persons[pointer]]
 519                         roles = pl_persons[pointer]['roles']
 520                         if 'pi' in roles:
 521                             record['PI'].extend(hrns)
 522                         if 'tech' in roles:
 523                             record['operator'].extend(hrns)
 524                         if 'admin' in roles:
 525                             record['owner'].extend(hrns)
 526                         # xxx TODO: OrganizationName
 527             elif (type == "node"):
 528                 sfa_info['dns'] = record.get("hostname", "")
 529                 # xxx TODO: URI, LatLong, IP, DNS
 530
 531             elif (type == "user"):
 532                 sfa_info['email'] = record.get("email", "")
 533                 sfa_info['geni_urn'] = hrn_to_urn(record['hrn'], 'user')
 534                 sfa_info['geni_certificate'] = record['gid']
 535                 # xxx TODO: PostalAddress, Phone
 536             record.update(sfa_info)
 537
 538     def fill_record_info(self, records):
 539         """
 540         Given a SFA record, fill in the PLC specific and SFA specific
 541         fields in the record.
 542         """
 543         if not isinstance(records, list):
 544             records = [records]
 545
 546         self.fill_record_pl_info(records)
 547         self.fill_record_sfa_info(records)
 548
 549     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 550         # get a list of the HRNs tht are members of the old and new records
 551         if oldRecord:
 552             oldList = oldRecord.get(listName, [])
 553         else:
 554             oldList = []
 555         newList = record.get(listName, [])
 556
 557         # if the lists are the same, then we don't have to update anything
 558         if (oldList == newList):
 559             return
 560
 561         # build a list of the new person ids, by looking up each person to get
 562         # their pointer
 563         newIdList = []
 564         table = self.SfaTable()
 565         records = table.find({'type': 'user', 'hrn': newList})
 566         for rec in records:
 567             newIdList.append(rec['pointer'])
 568
 569         # build a list of the old person ids from the person_ids field
 570         if oldRecord:
 571             oldIdList = oldRecord.get("person_ids", [])
 572             containerId = oldRecord.get_pointer()
 573         else:
 574             # if oldRecord==None, then we are doing a Register, instead of an
 575             # update.
 576             oldIdList = []
 577             containerId = record.get_pointer()
 578
 579     # add people who are in the new list, but not the oldList
 580         for personId in newIdList:
 581             if not (personId in oldIdList):
 582                 addFunc(self.plauth, personId, containerId)
 583
 584         # remove people who are in the old list, but not the new list
 585         for personId in oldIdList:
 586             if not (personId in newIdList):
 587                 delFunc(self.plauth, personId, containerId)
 588
 589     def update_membership(self, oldRecord, record):
 590         if record.type == "slice":
 591             self.update_membership_list(oldRecord, record, 'researcher',
 592                                         self.plshell.AddPersonToSlice,
 593                                         self.plshell.DeletePersonFromSlice)
 594         elif record.type == "authority":
 595             # xxx TODO
 596             pass
 597
 598
 599
 600 class ComponentAPI(BaseAPI):
 601
 602     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8", methods='sfa.methods',
 603                  peer_cert = None, interface = None, key_file = None, cert_file = None):
 604
 605         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, peer_cert=peer_cert,
 606                          interface=interface, key_file=key_file, cert_file=cert_file)
 607         self.encoding = encoding
 608
 609         # Better just be documenting the API
 610         if config is None:
 611             return
 612
 613         self.nodemanager = NodeManager(self.config)
 614
 615     def sliver_exists(self):
 616         sliver_dict = self.nodemanager.GetXIDs()
 617         if slicename in sliver_dict.keys():
 618             return True
 619         else:
 620             return False
 621
 622     def get_registry(self):
 623         addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
 624         url = "http://%(addr)s:%(port)s" % locals()
 625         server = xmlrpcprotocol.get_server(url, self.key_file, self.cert_file)
 626         return server
 627
 628     def get_node_key(self):
 629         # this call requires no authentication,
 630         # so we can generate a random keypair here
 631         subject="component"
 632         (kfd, keyfile) = tempfile.mkstemp()
 633         (cfd, certfile) = tempfile.mkstemp()
 634         key = Keypair(create=True)
 635         key.save_to_file(keyfile)
 636         cert = Certificate(subject=subject)
 637         cert.set_issuer(key=key, subject=subject)
 638         cert.set_pubkey(key)
 639         cert.sign()
 640         cert.save_to_file(certfile)
 641         registry = self.get_registry()
 642         # the registry will scp the key onto the node
 643         registry.get_key()
 644
 645     def getCredential(self):
 646         """
 647         Get our credential from a remote registry
 648         """
 649         path = self.config.SFA_DATA_DIR
 650         config_dir = self.config.config_path
 651         cred_filename = path + os.sep + 'node.cred'
 652         try:
 653             credential = Credential(filename = cred_filename)
 654             return credential.save_to_string(save_parents=True)
 655         except IOError:
 656             node_pkey_file = config_dir + os.sep + "node.key"
 657             node_gid_file = config_dir + os.sep + "node.gid"
 658             cert_filename = path + os.sep + 'server.cert'
 659             if not os.path.exists(node_pkey_file) or \
 660                not os.path.exists(node_gid_file):
 661                 self.get_node_key()
 662
 663             # get node's hrn
 664             gid = GID(filename=node_gid_file)
 665             hrn = gid.get_hrn()
 666             # get credential from registry
 667             cert_str = Certificate(filename=cert_filename).save_to_string(save_parents=True)
 668             registry = self.get_registry()
 669             cred = registry.GetSelfCredential(cert_str, hrn, 'node')
 670             Credential(string=cred).save_to_file(credfile, save_parents=True)
 671
 672             return cred
 673
 674     def clean_key_cred(self):
 675         """
 676         remove the existing keypair and cred  and generate new ones
 677         """
 678         files = ["server.key", "server.cert", "node.cred"]
 679         for f in files:
 680             filepath = KEYDIR + os.sep + f
 681             if os.path.isfile(filepath):
 682                 os.unlink(f)
 683
 684         # install the new key pair
 685         # GetCredential will take care of generating the new keypair
 686         # and credential
 687         self.get_node_key()
 688         self.getCredential()
 689
 690