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 sfa_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         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         type = 'authority'
 132         path = self.config.SFA_DATA_DIR
 133         filename = ".".join([self.interface, self.hrn, type, "cred"])
 134         cred_filename = path + os.sep + filename
 135         cred = None
 136         if os.path.isfile(cred_filename):
 137             cred = Credential(filename = cred_filename)
 138             # make sure cred isnt expired
 139             if not cred.get_expiration or \
 140                datetime.datetime.today() < cred.get_expiration():
 141                 return cred.save_to_string(save_parents=True)
 142
 143         # get a new credential
 144         if self.interface in ['registry']:
 145             cred =  self.__getCredentialRaw()
 146         else:
 147             cred =  self.__getCredential()
 148         cred.save_to_file(cred_filename, save_parents=True)
 149
 150         return cred.save_to_string(save_parents=True)
 151
 152
 153     def getDelegatedCredential(self, creds):
 154         """
 155         Attempt to find a credential delegated to us in
 156         the specified list of creds.
 157         """
 158         if creds and not isinstance(creds, list):
 159             creds = [creds]
 160         delegated_creds = filter_creds_by_caller(creds,self.hrn)
 161         if not delegated_creds:
 162             return None
 163         return delegated_creds[0]
 164
 165     def __getCredential(self):
 166         """
 167         Get our credential from a remote registry
 168         """
 169         from sfa.server.registry import Registries
 170         registries = Registries(self)
 171         registry = registries[self.hrn]
 172         cert_string=self.cert.save_to_string(save_parents=True)
 173         # get self credential
 174         self_cred = registry.GetSelfCredential(cert_string, self.hrn, 'authority')
 175         # get credential
 176         cred = registry.GetCredential(self_cred, self.hrn, 'authority')
 177         return Credential(string=cred)
 178
 179     def __getCredentialRaw(self):
 180         """
 181         Get our current credential directly from the local registry.
 182         """
 183
 184         hrn = self.hrn
 185         auth_hrn = self.auth.get_authority(hrn)
 186
 187         # is this a root or sub authority
 188         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 189             auth_hrn = hrn
 190         auth_info = self.auth.get_auth_info(auth_hrn)
 191         table = self.SfaTable()
 192         records = table.findObjects(hrn)
 193         if not records:
 194             raise RecordNotFound
 195         record = records[0]
 196         type = record['type']
 197         object_gid = record.get_gid_object()
 198         new_cred = Credential(subject = object_gid.get_subject())
 199         new_cred.set_gid_caller(object_gid)
 200         new_cred.set_gid_object(object_gid)
 201         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 202
 203         r1 = determine_rights(type, hrn)
 204         new_cred.set_privileges(r1)
 205         new_cred.encode()
 206         new_cred.sign()
 207
 208         return new_cred
 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                 if 'key_ids' not in record:
 343                     self.logger.info("user record has no 'key_ids' - need to import from myplc ?")
 344                 else:
 345                     pubkeys = [keys[key_id]['key'] for key_id in record['key_ids'] if key_id in keys]
 346                     record['keys'] = pubkeys
 347
 348         # fill in record hrns
 349         records = self.fill_record_hrns(records)
 350
 351         return records
 352
 353     def fill_record_hrns(self, records):
 354         """
 355         convert pl ids to hrns
 356         """
 357
 358         # get ids
 359         slice_ids, person_ids, site_ids, node_ids = [], [], [], []
 360         for record in records:
 361             if 'site_id' in record:
 362                 site_ids.append(record['site_id'])
 363             if 'site_ids' in records:
 364                 site_ids.extend(record['site_ids'])
 365             if 'person_ids' in record:
 366                 person_ids.extend(record['person_ids'])
 367             if 'slice_ids' in record:
 368                 slice_ids.extend(record['slice_ids'])
 369             if 'node_ids' in record:
 370                 node_ids.extend(record['node_ids'])
 371
 372         # get pl records
 373         slices, persons, sites, nodes = {}, {}, {}, {}
 374         if site_ids:
 375             site_list = self.plshell.GetSites(self.plauth, site_ids, ['site_id', 'login_base'])
 376             sites = list_to_dict(site_list, 'site_id')
 377         if person_ids:
 378             person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'email'])
 379             persons = list_to_dict(person_list, 'person_id')
 380         if slice_ids:
 381             slice_list = self.plshell.GetSlices(self.plauth, slice_ids, ['slice_id', 'name'])
 382             slices = list_to_dict(slice_list, 'slice_id')
 383         if node_ids:
 384             node_list = self.plshell.GetNodes(self.plauth, node_ids, ['node_id', 'hostname'])
 385             nodes = list_to_dict(node_list, 'node_id')
 386
 387         # convert ids to hrns
 388         for record in records:
 389             # get all relevant data
 390             type = record['type']
 391             pointer = record['pointer']
 392             auth_hrn = self.hrn
 393             login_base = ''
 394             if pointer == -1:
 395                 continue
 396
 397             if 'site_id' in record:
 398                 site = sites[record['site_id']]
 399                 login_base = site['login_base']
 400                 record['site'] = ".".join([auth_hrn, login_base])
 401             if 'person_ids' in record:
 402                 emails = [persons[person_id]['email'] for person_id in record['person_ids'] \
 403                           if person_id in  persons]
 404                 usernames = [email.split('@')[0] for email in emails]
 405                 person_hrns = [".".join([auth_hrn, login_base, username]) for username in usernames]
 406                 record['persons'] = person_hrns
 407             if 'slice_ids' in record:
 408                 slicenames = [slices[slice_id]['name'] for slice_id in record['slice_ids'] \
 409                               if slice_id in slices]
 410                 slice_hrns = [slicename_to_hrn(auth_hrn, slicename) for slicename in slicenames]
 411                 record['slices'] = slice_hrns
 412             if 'node_ids' in record:
 413                 hostnames = [nodes[node_id]['hostname'] for node_id in record['node_ids'] \
 414                              if node_id in nodes]
 415                 node_hrns = [hostname_to_hrn(auth_hrn, login_base, hostname) for hostname in hostnames]
 416                 record['nodes'] = node_hrns
 417             if 'site_ids' in record:
 418                 login_bases = [sites[site_id]['login_base'] for site_id in record['site_ids'] \
 419                                if site_id in sites]
 420                 site_hrns = [".".join([auth_hrn, lbase]) for lbase in login_bases]
 421                 record['sites'] = site_hrns
 422
 423         return records
 424
 425     def fill_record_sfa_info(self, records):
 426
 427         def startswith(prefix, values):
 428             return [value for value in values if value.startswith(prefix)]
 429
 430         # get person ids
 431         person_ids = []
 432         site_ids = []
 433         for record in records:
 434             person_ids.extend(record.get("person_ids", []))
 435             site_ids.extend(record.get("site_ids", []))
 436             if 'site_id' in record:
 437                 site_ids.append(record['site_id'])
 438
 439         # get all pis from the sites we've encountered
 440         # and store them in a dictionary keyed on site_id
 441         site_pis = {}
 442         if site_ids:
 443             pi_filter = {'|roles': ['pi'], '|site_ids': site_ids}
 444             pi_list = self.plshell.GetPersons(self.plauth, pi_filter, ['person_id', 'site_ids'])
 445             for pi in pi_list:
 446                 # we will need the pi's hrns also
 447                 person_ids.append(pi['person_id'])
 448
 449                 # we also need to keep track of the sites these pis
 450                 # belong to
 451                 for site_id in pi['site_ids']:
 452                     if site_id in site_pis:
 453                         site_pis[site_id].append(pi)
 454                     else:
 455                         site_pis[site_id] = [pi]
 456
 457         # get sfa records for all records associated with these records.
 458         # we'll replace pl ids (person_ids) with hrns from the sfa records
 459         # we obtain
 460
 461         # get the sfa records
 462         table = self.SfaTable()
 463         person_list, persons = [], {}
 464         person_list = table.find({'type': 'user', 'pointer': person_ids})
 465         # create a hrns keyed on the sfa record's pointer.
 466         # Its possible for  multiple records to have the same pointer so
 467         # the dict's value will be a list of hrns.
 468         persons = defaultdict(list)
 469         for person in person_list:
 470             persons[person['pointer']].append(person)
 471
 472         # get the pl records
 473         pl_person_list, pl_persons = [], {}
 474         pl_person_list = self.plshell.GetPersons(self.plauth, person_ids, ['person_id', 'roles'])
 475         pl_persons = list_to_dict(pl_person_list, 'person_id')
 476
 477         # fill sfa info
 478         for record in records:
 479             # skip records with no pl info (top level authorities)
 480             #if record['pointer'] == -1:
 481             #    continue
 482             sfa_info = {}
 483             type = record['type']
 484             if (type == "slice"):
 485                 # all slice users are researchers
 486                 record['geni_urn'] = hrn_to_urn(record['hrn'], 'slice')
 487                 record['PI'] = []
 488                 record['researcher'] = []
 489                 for person_id in record.get('person_ids', []):
 490                     hrns = [person['hrn'] for person in persons[person_id]]
 491                     record['researcher'].extend(hrns)
 492
 493                 # pis at the slice's site
 494                 if 'site_id' in record and record['site_id'] in site_pis:
 495                     pl_pis = site_pis[record['site_id']]
 496                     pi_ids = [pi['person_id'] for pi in pl_pis]
 497                     for person_id in pi_ids:
 498                         hrns = [person['hrn'] for person in persons[person_id]]
 499                         record['PI'].extend(hrns)
 500                         record['geni_creator'] = record['PI']
 501
 502             elif (type.startswith("authority")):
 503                 record['url'] = None
 504                 if record['hrn'] in self.aggregates:
 505                     record['url'] = self.aggregates[record['hrn']].url
 506
 507                 if record['pointer'] != -1:
 508                     record['PI'] = []
 509                     record['operator'] = []
 510                     record['owner'] = []
 511                     for pointer in record.get('person_ids', []):
 512                         if pointer not in persons or pointer not in pl_persons:
 513                             # this means there is not sfa or pl record for this user
 514                             continue
 515                         hrns = [person['hrn'] for person in persons[pointer]]
 516                         roles = pl_persons[pointer]['roles']
 517                         if 'pi' in roles:
 518                             record['PI'].extend(hrns)
 519                         if 'tech' in roles:
 520                             record['operator'].extend(hrns)
 521                         if 'admin' in roles:
 522                             record['owner'].extend(hrns)
 523                         # xxx TODO: OrganizationName
 524             elif (type == "node"):
 525                 sfa_info['dns'] = record.get("hostname", "")
 526                 # xxx TODO: URI, LatLong, IP, DNS
 527
 528             elif (type == "user"):
 529                 sfa_info['email'] = record.get("email", "")
 530                 sfa_info['geni_urn'] = hrn_to_urn(record['hrn'], 'user')
 531                 sfa_info['geni_certificate'] = record['gid']
 532                 # xxx TODO: PostalAddress, Phone
 533             record.update(sfa_info)
 534
 535     def fill_record_info(self, records):
 536         """
 537         Given a SFA record, fill in the PLC specific and SFA specific
 538         fields in the record.
 539         """
 540         if not isinstance(records, list):
 541             records = [records]
 542
 543         self.fill_record_pl_info(records)
 544         self.fill_record_sfa_info(records)
 545
 546     def update_membership_list(self, oldRecord, record, listName, addFunc, delFunc):
 547         # get a list of the HRNs tht are members of the old and new records
 548         if oldRecord:
 549             oldList = oldRecord.get(listName, [])
 550         else:
 551             oldList = []
 552         newList = record.get(listName, [])
 553
 554         # if the lists are the same, then we don't have to update anything
 555         if (oldList == newList):
 556             return
 557
 558         # build a list of the new person ids, by looking up each person to get
 559         # their pointer
 560         newIdList = []
 561         table = self.SfaTable()
 562         records = table.find({'type': 'user', 'hrn': newList})
 563         for rec in records:
 564             newIdList.append(rec['pointer'])
 565
 566         # build a list of the old person ids from the person_ids field
 567         if oldRecord:
 568             oldIdList = oldRecord.get("person_ids", [])
 569             containerId = oldRecord.get_pointer()
 570         else:
 571             # if oldRecord==None, then we are doing a Register, instead of an
 572             # update.
 573             oldIdList = []
 574             containerId = record.get_pointer()
 575
 576     # add people who are in the new list, but not the oldList
 577         for personId in newIdList:
 578             if not (personId in oldIdList):
 579                 addFunc(self.plauth, personId, containerId)
 580
 581         # remove people who are in the old list, but not the new list
 582         for personId in oldIdList:
 583             if not (personId in newIdList):
 584                 delFunc(self.plauth, personId, containerId)
 585
 586     def update_membership(self, oldRecord, record):
 587         if record.type == "slice":
 588             self.update_membership_list(oldRecord, record, 'researcher',
 589                                         self.plshell.AddPersonToSlice,
 590                                         self.plshell.DeletePersonFromSlice)
 591         elif record.type == "authority":
 592             # xxx TODO
 593             pass
 594
 595
 596
 597 class ComponentAPI(BaseAPI):
 598
 599     def __init__(self, config = "/etc/sfa/sfa_config.py", encoding = "utf-8", methods='sfa.methods',
 600                  peer_cert = None, interface = None, key_file = None, cert_file = None):
 601
 602         BaseAPI.__init__(self, config=config, encoding=encoding, methods=methods, peer_cert=peer_cert,
 603                          interface=interface, key_file=key_file, cert_file=cert_file)
 604         self.encoding = encoding
 605
 606         # Better just be documenting the API
 607         if config is None:
 608             return
 609
 610         self.nodemanager = NodeManager(self.config)
 611
 612     def sliver_exists(self):
 613         sliver_dict = self.nodemanager.GetXIDs()
 614         if slicename in sliver_dict.keys():
 615             return True
 616         else:
 617             return False
 618
 619     def get_registry(self):
 620         addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
 621         url = "http://%(addr)s:%(port)s" % locals()
 622         server = xmlrpcprotocol.get_server(url, self.key_file, self.cert_file)
 623         return server
 624
 625     def get_node_key(self):
 626         # this call requires no authentication,
 627         # so we can generate a random keypair here
 628         subject="component"
 629         (kfd, keyfile) = tempfile.mkstemp()
 630         (cfd, certfile) = tempfile.mkstemp()
 631         key = Keypair(create=True)
 632         key.save_to_file(keyfile)
 633         cert = Certificate(subject=subject)
 634         cert.set_issuer(key=key, subject=subject)
 635         cert.set_pubkey(key)
 636         cert.sign()
 637         cert.save_to_file(certfile)
 638         registry = self.get_registry()
 639         # the registry will scp the key onto the node
 640         registry.get_key()
 641
 642     def getCredential(self):
 643         """
 644         Get our credential from a remote registry
 645         """
 646         path = self.config.SFA_DATA_DIR
 647         config_dir = self.config.config_path
 648         cred_filename = path + os.sep + 'node.cred'
 649         try:
 650             credential = Credential(filename = cred_filename)
 651             return credential.save_to_string(save_parents=True)
 652         except IOError:
 653             node_pkey_file = config_dir + os.sep + "node.key"
 654             node_gid_file = config_dir + os.sep + "node.gid"
 655             cert_filename = path + os.sep + 'server.cert'
 656             if not os.path.exists(node_pkey_file) or \
 657                not os.path.exists(node_gid_file):
 658                 self.get_node_key()
 659
 660             # get node's hrn
 661             gid = GID(filename=node_gid_file)
 662             hrn = gid.get_hrn()
 663             # get credential from registry
 664             cert_str = Certificate(filename=cert_filename).save_to_string(save_parents=True)
 665             registry = self.get_registry()
 666             cred = registry.GetSelfCredential(cert_str, hrn, 'node')
 667             Credential(string=cred).save_to_file(credfile, save_parents=True)
 668
 669             return cred
 670
 671     def clean_key_cred(self):
 672         """
 673         remove the existing keypair and cred  and generate new ones
 674         """
 675         files = ["server.key", "server.cert", "node.cred"]
 676         for f in files:
 677             filepath = KEYDIR + os.sep + f
 678             if os.path.isfile(filepath):
 679                 os.unlink(f)
 680
 681         # install the new key pair
 682         # GetCredential will take care of generating the new keypair
 683         # and credential
 684         self.get_node_key()
 685         self.getCredential()
 686
 687