sfa/server/sfaapi.py

   1 from sfa.util.faults import SfaAPIError
   2 from sfa.util.config import Config
   3 from sfa.util.cache import Cache
   4 from sfa.trust.auth import Auth
   5 from sfa.trust.certificate import Keypair, Certificate
   6
   7 # this is wrong all right, but temporary
   8 from sfa.managers.managerwrapper import ManagerWrapper, import_manager
   9 from sfa.server.xmlrpcapi import XmlrpcApi
  10 import os
  11
  12 ####################
  13 class SfaApi (XmlrpcApi):
  14
  15     """
  16     An SfaApi instance is a basic xmlrcp service
  17     augmented with the local cryptographic material and hrn
  18     It also has the notion of neighbour sfa services
  19     as defined in /etc/sfa/{aggregates,registries}.xml
  20     It has no a priori knowledge of the underlying testbed
  21     """
  22
  23     def __init__ (self, encoding="utf-8", methods='sfa.methods',
  24                   config = "/etc/sfa/sfa_config.py",
  25                   peer_cert = None, interface = None,
  26                   key_file = None, cert_file = None, cache = None):
  27
  28         XmlrpcApi.__init__ (self, encoding)
  29
  30         # we may be just be documenting the API
  31         if config is None:
  32             return
  33         # Load configuration
  34         self.config = Config(config)
  35         self.auth = Auth(peer_cert)
  36         self.interface = interface
  37         self.hrn = self.config.SFA_INTERFACE_HRN
  38         self.key_file = key_file
  39         self.key = Keypair(filename=self.key_file)
  40         self.cert_file = cert_file
  41         self.cert = Certificate(filename=self.cert_file)
  42         self.cache = cache
  43         if self.cache is None:
  44             self.cache = Cache()
  45         self.credential = None
  46
  47         # load registries
  48         from sfa.server.registry import Registries
  49         self.registries = Registries()
  50
  51         # load aggregates
  52         from sfa.server.aggregate import Aggregates
  53         self.aggregates = Aggregates()
  54
  55
  56     def get_interface_manager(self, manager_base = 'sfa.managers'):
  57         """
  58         Returns the appropriate manager module for this interface.
  59         Modules are usually found in sfa/managers/
  60         """
  61         manager=None
  62         if self.interface in ['registry']:
  63             manager=import_manager ("registry",  self.config.SFA_REGISTRY_TYPE)
  64         elif self.interface in ['aggregate']:
  65             manager=import_manager ("aggregate", self.config.SFA_AGGREGATE_TYPE)
  66         elif self.interface in ['slicemgr', 'sm']:
  67             manager=import_manager ("slice",     self.config.SFA_SM_TYPE)
  68         elif self.interface in ['component', 'cm']:
  69             manager=import_manager ("component", self.config.SFA_CM_TYPE)
  70         if not manager:
  71             raise SfaAPIError("No manager for interface: %s" % self.interface)
  72
  73         # this isnt necessary but will help to produce better error messages
  74         # if someone tries to access an operation this manager doesn't implement
  75         manager = ManagerWrapper(manager, self.interface)
  76
  77         return manager
  78
  79     def get_server(self, interface, cred, timeout=30):
  80         """
  81         Returns a connection to the specified interface. Use the specified
  82         credential to determine the caller and look for the caller's key/cert
  83         in the registry hierarchy cache.
  84         """
  85         from sfa.trust.hierarchy import Hierarchy
  86         if not isinstance(cred, Credential):
  87             cred_obj = Credential(string=cred)
  88         else:
  89             cred_obj = cred
  90         caller_gid = cred_obj.get_gid_caller()
  91         hierarchy = Hierarchy()
  92         auth_info = hierarchy.get_auth_info(caller_gid.get_hrn())
  93         key_file = auth_info.get_privkey_filename()
  94         cert_file = auth_info.get_gid_filename()
  95         server = interface.get_server(key_file, cert_file, timeout)
  96         return server
  97
  98
  99     def getCredential(self):
 100         """
 101         Return a valid credential for this interface.
 102         """
 103         type = 'authority'
 104         path = self.config.SFA_DATA_DIR
 105         filename = ".".join([self.interface, self.hrn, type, "cred"])
 106         cred_filename = path + os.sep + filename
 107         cred = None
 108         if os.path.isfile(cred_filename):
 109             cred = Credential(filename = cred_filename)
 110             # make sure cred isnt expired
 111             if not cred.get_expiration or \
 112                datetime.datetime.utcnow() < cred.get_expiration():
 113                 return cred.save_to_string(save_parents=True)
 114
 115         # get a new credential
 116         if self.interface in ['registry']:
 117             cred =  self.__getCredentialRaw()
 118         else:
 119             cred =  self.__getCredential()
 120         cred.save_to_file(cred_filename, save_parents=True)
 121
 122         return cred.save_to_string(save_parents=True)
 123
 124
 125     def getDelegatedCredential(self, creds):
 126         """
 127         Attempt to find a credential delegated to us in
 128         the specified list of creds.
 129         """
 130         from sfa.trust.hierarchy import Hierarchy
 131         if creds and not isinstance(creds, list):
 132             creds = [creds]
 133         hierarchy = Hierarchy()
 134
 135         delegated_cred = None
 136         for cred in creds:
 137             if hierarchy.auth_exists(Credential(string=cred).get_gid_caller().get_hrn()):
 138                 delegated_cred = cred
 139                 break
 140         return delegated_cred
 141
 142     def __getCredential(self):
 143         """
 144         Get our credential from a remote registry
 145         """
 146         from sfa.server.registry import Registries
 147         registries = Registries()
 148         registry = registries.get_server(self.hrn, self.key_file, self.cert_file)
 149         cert_string=self.cert.save_to_string(save_parents=True)
 150         # get self credential
 151         self_cred = registry.GetSelfCredential(cert_string, self.hrn, 'authority')
 152         # get credential
 153         cred = registry.GetCredential(self_cred, self.hrn, 'authority')
 154         return Credential(string=cred)
 155
 156     def __getCredentialRaw(self):
 157         """
 158         Get our current credential directly from the local registry.
 159         """
 160
 161         hrn = self.hrn
 162         auth_hrn = self.auth.get_authority(hrn)
 163
 164         # is this a root or sub authority
 165         if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
 166             auth_hrn = hrn
 167         auth_info = self.auth.get_auth_info(auth_hrn)
 168         table = self.SfaTable()
 169         records = table.findObjects({'hrn': hrn, 'type': 'authority+sa'})
 170         if not records:
 171             raise RecordNotFound
 172         record = records[0]
 173         type = record['type']
 174         object_gid = record.get_gid_object()
 175         new_cred = Credential(subject = object_gid.get_subject())
 176         new_cred.set_gid_caller(object_gid)
 177         new_cred.set_gid_object(object_gid)
 178         new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
 179
 180         r1 = determine_rights(type, hrn)
 181         new_cred.set_privileges(r1)
 182         new_cred.encode()
 183         new_cred.sign()
 184
 185         return new_cred
 186
 187     def loadCredential (self):
 188         """
 189         Attempt to load credential from file if it exists. If it doesnt get
 190         credential from registry.
 191         """
 192
 193         # see if this file exists
 194         # XX This is really the aggregate's credential. Using this is easier than getting
 195         # the registry's credential from iteslf (ssl errors).
 196         ma_cred_filename = self.config.SFA_DATA_DIR + os.sep + self.interface + self.hrn + ".ma.cred"
 197         try:
 198             self.credential = Credential(filename = ma_cred_filename)
 199         except IOError:
 200             self.credential = self.getCredentialFromRegistry()
 201
 202     def get_cached_server_version(self, server):
 203         cache_key = server.url + "-version"
 204         server_version = None
 205         if self.cache:
 206             server_version = self.cache.get(cache_key)
 207         if not server_version:
 208             server_version = server.GetVersion()
 209             # cache version for 24 hours
 210             self.cache.add(cache_key, server_version, ttl= 60*60*24)
 211         return server_version