4 from sfa.util.faults import SfaFault, SfaAPIError, RecordNotFound
5 from sfa.util.genicode import GENICODE
6 from sfa.util.config import Config
7 from sfa.util.cache import Cache
9 from sfa.trust.auth import Auth
10 from sfa.trust.certificate import Keypair, Certificate
11 from sfa.trust.credential import Credential
12 from sfa.trust.rights import determine_rights
13 from sfa.util.version import version_core
14 from sfa.server.xmlrpcapi import XmlrpcApi
15 from sfa.client.return_value import ReturnValue
17 from sfa.storage.alchemy import alchemy
20 class SfaApi (XmlrpcApi):
22 An SfaApi instance is a basic xmlrcp service
23 augmented with the local cryptographic material and hrn
25 It also has the notion of its own interface (a string describing
26 whether we run a registry, aggregate or slicemgr) and has
27 the notion of neighbour sfa services as defined
28 in /etc/sfa/{aggregates,registries}.xml
30 Finally it contains a cache instance
32 It gets augmented by the generic layer with
33 (*) an instance of manager (actually a manager module for now)
34 beware that this is shared among all instances of api
35 (*) an instance of a testbed driver
38 def __init__ (self, encoding="utf-8", methods='sfa.methods',
39 config = "/etc/sfa/sfa_config",
40 peer_cert = None, interface = None,
41 key_file = None, cert_file = None, cache = None):
43 XmlrpcApi.__init__ (self, encoding)
45 # we may be just be documenting the API
49 self.config = Config(config)
50 self.credential = None
51 self.auth = Auth(peer_cert)
52 self.interface = interface
53 self.hrn = self.config.SFA_INTERFACE_HRN
54 self.key_file = key_file
55 self.key = Keypair(filename=self.key_file)
56 self.cert_file = cert_file
57 self.cert = Certificate(filename=self.cert_file)
59 if self.cache is None:
63 from sfa.server.registry import Registries
64 self.registries = Registries()
67 from sfa.server.aggregate import Aggregates
68 self.aggregates = Aggregates()
70 # filled later on by generic/Generic
74 def server_proxy(self, interface, cred, timeout=30):
76 Returns a connection to the specified interface. Use the specified
77 credential to determine the caller and look for the caller's key/cert
78 in the registry hierarchy cache.
80 from sfa.trust.hierarchy import Hierarchy
81 if not isinstance(cred, Credential):
82 cred_obj = Credential(string=cred)
85 caller_gid = cred_obj.get_gid_caller()
86 hierarchy = Hierarchy()
87 auth_info = hierarchy.get_auth_info(caller_gid.get_hrn())
88 key_file = auth_info.get_privkey_filename()
89 cert_file = auth_info.get_gid_filename()
90 server = interface.server_proxy(key_file, cert_file, timeout)
94 if self._dbsession is None:
95 self._dbsession=alchemy.session()
96 return self._dbsession
98 def close_dbsession(self):
99 if self._dbsession is None: return
100 alchemy.close_session(self._dbsession)
103 def getCredential(self, minimumExpiration=0):
105 Return a valid credential for this interface.
108 path = self.config.SFA_DATA_DIR
109 filename = ".".join([self.interface, self.hrn, type, "cred"])
110 cred_filename = os.path.join(path,filename)
112 if os.path.isfile(cred_filename):
113 cred = Credential(filename = cred_filename)
114 # make sure cred isnt expired
115 if not cred.get_expiration or \
116 datetime.datetime.utcnow() + datetime.timedelta(seconds=minimumExpiration) < cred.get_expiration():
117 return cred.save_to_string(save_parents=True)
119 # get a new credential
120 if self.interface in ['registry']:
121 cred = self._getCredentialRaw()
123 cred = self._getCredential()
124 cred.save_to_file(cred_filename, save_parents=True)
126 return cred.save_to_string(save_parents=True)
129 def getDelegatedCredential(self, creds):
131 Attempt to find a credential delegated to us in
132 the specified list of creds.
134 from sfa.trust.hierarchy import Hierarchy
135 if creds and not isinstance(creds, list):
137 hierarchy = Hierarchy()
139 delegated_cred = None
141 if hierarchy.auth_exists(Credential(cred=cred).get_gid_caller().get_hrn()):
142 delegated_cred = cred
144 return delegated_cred
146 def _getCredential(self):
148 Get our credential from a remote registry
150 from sfa.server.registry import Registries
151 registries = Registries()
152 registry = registries.server_proxy(self.hrn, self.key_file, self.cert_file)
153 cert_string=self.cert.save_to_string(save_parents=True)
154 # get self credential
155 self_cred = registry.GetSelfCredential(cert_string, self.hrn, 'authority')
157 cred = registry.GetCredential(self_cred, self.hrn, 'authority')
158 return Credential(string=cred)
160 def _getCredentialRaw(self):
162 Get our current credential directly from the local registry.
166 auth_hrn = self.auth.get_authority(hrn)
168 # is this a root or sub authority
169 if not auth_hrn or hrn == self.config.SFA_INTERFACE_HRN:
171 auth_info = self.auth.get_auth_info(auth_hrn)
172 # xxx although unlikely we might want to check for a potential leak
173 dbsession=self.dbsession()
174 from sfa.storage.model import RegRecord
175 record = dbsession.query(RegRecord).filter_by(type='authority+sa', hrn=hrn).first()
177 raise RecordNotFound(hrn)
179 object_gid = record.get_gid_object()
180 new_cred = Credential(subject = object_gid.get_subject())
181 new_cred.set_gid_caller(object_gid)
182 new_cred.set_gid_object(object_gid)
183 new_cred.set_issuer_keys(auth_info.get_privkey_filename(), auth_info.get_gid_filename())
185 r1 = determine_rights(type, hrn)
186 new_cred.set_privileges(r1)
192 def loadCredential (self):
194 Attempt to load credential from file if it exists. If it doesnt get
195 credential from registry.
198 # see if this file exists
199 # XX This is really the aggregate's credential. Using this is easier than getting
200 # the registry's credential from iteslf (ssl errors).
201 filename = self.interface + self.hrn + ".ma.cred"
202 ma_cred_path = os.path.join(self.config.SFA_DATA_DIR,filename)
204 self.credential = Credential(filename = ma_cred_path)
206 self.credential = self.getCredentialFromRegistry()
208 def get_cached_server_version(self, server):
209 cache_key = server.url + "-version"
210 server_version = None
212 server_version = self.cache.get(cache_key)
213 if not server_version:
214 result = server.GetVersion()
215 server_version = ReturnValue.get_value(result)
216 # cache version for 24 hours
217 self.cache.add(cache_key, server_version, ttl= 60*60*24)
218 return server_version
221 def get_geni_code(self, result):
223 'geni_code': GENICODE.SUCCESS,
227 if isinstance(result, SfaFault):
228 code['geni_code'] = result.faultCode
229 code['am_code'] = result.faultCode
233 def get_geni_value(self, result):
235 if isinstance(result, SfaFault):
239 def get_geni_output(self, result):
241 if isinstance(result, SfaFault):
242 output = result.faultString
245 def prepare_response_am(self, result):
246 version = version_core()
249 'code': self.get_geni_code(result),
250 'value': self.get_geni_value(result),
251 'output': self.get_geni_output(result),
255 def prepare_response(self, result, method=""):
257 Converts the specified result into a standard GENI compliant
260 # as of dec 13 2011 we only support API v2
261 if self.interface.lower() in ['aggregate', 'slicemgr']:
262 result = self.prepare_response_am(result)
263 return XmlrpcApi.prepare_response(self, result, method)