sfa/methods/get_credential.py

   1 ### $Id$
   2 ### $URL$
   3
   4 from sfa.trust.credential import *
   5 from sfa.trust.rights import *
   6 from sfa.util.faults import *
   7 from sfa.util.method import Method
   8 from sfa.util.parameter import Parameter, Mixed
   9 from sfa.trust.auth import Auth
  10 from sfa.trust.gid import GID
  11 from sfa.util.record import GeniRecord
  12 from sfa.util.genitable import *
  13 from sfa.util.debug import log
  14
  15 class get_credential(Method):
  16     """
  17     Retrive a credential for an object
  18     If cred == Nonee then the behavior reverts to get_self_credential
  19
  20     @param cred credential object specifying rights of the caller
  21     @param type type of object (user | slice | sa | ma | node)
  22     @param hrn human readable name of object
  23     @param origin_hrn human readable name of calls origin
  24
  25     @return the string representation of a credential object
  26     """
  27
  28     interfaces = ['registry']
  29
  30     accepts = [
  31         Mixed(Parameter(str, "credential"),
  32               Parameter(None, "No credential")),
  33         Parameter(str, "Human readable name (hrn)"),
  34         Mixed(Parameter(str, "Request hash"),
  35               Parameter(None, "Request hash not specified")),
  36         Parameter(str, "Human readable name (hrn)"),
  37         ]
  38
  39     returns = Parameter(str, "String representation of a credential object")
  40
  41     def call(self, cred, type, hrn, origin_hrn=None, request_hash=None):
  42
  43         self.api.auth.authenticateCred(cred, [cred, type, hrn], request_hash)
  44         self.api.auth.check(cred, 'getcredential')
  45         self.api.auth.verify_object_belongs_to_me(hrn)
  46         auth_hrn = self.api.auth.get_authority(hrn)
  47
  48         # Is this a root or sub authority
  49         if not auth_hrn or hrn == self.api.config.SFA_INTERFACE_HRN:
  50             auth_hrn = hrn
  51
  52         # get record info
  53         auth_info = self.api.auth.get_auth_info(auth_hrn)
  54         table = GeniTable()
  55         records = table.find({'type': type, 'hrn': hrn})
  56         if not records:
  57             raise RecordNotFound(hrn)
  58         record = records[0]
  59
  60         # get the origin caller's gid (this is the caller's gid by default)
  61         if origin_hrn:
  62             orgin_records = table.find({'hrn': origin_hrn})
  63             if not origin_records:
  64                 raise RecordNotFound(origin_hrn)
  65             origin_record = origin_records[0]
  66             origin_caller_gid_object = GID(string = record['gid'])
  67         else:
  68             origin_caller_gid_object = self.api.auth.client_gid
  69
  70
  71         # verify_cancreate_credential requires that the member lists
  72         # (researchers, pis, etc) be filled in
  73         self.api.fill_record_info(record)
  74
  75         caller_hrn = self.api.auth.client_cred.get_gid_caller().get_hrn()
  76         rights = self.api.auth.determine_user_rights(caller_hrn, record)
  77         if rights.is_empty():
  78             raise PermissionError(self.api.auth.client_cred.get_gid_object().get_hrn() + " has no rights to " + record['name'])
  79
  80         # TODO: Check permission that self.client_cred can access the object
  81
  82         gid = record['gid']
  83         gid_object = GID(string=gid)
  84
  85         new_cred = Credential(subject = gid_object.get_subject())
  86         new_cred.set_gid_caller(self.api.auth.client_gid)
  87         new_cred.set_gid_origin_caller(origin_caller_gid_object)
  88         new_cred.set_gid_object(gid_object)
  89         new_cred.set_issuer(key=auth_info.get_pkey_object(), subject=auth_hrn)
  90         new_cred.set_pubkey(gid_object.get_pubkey())
  91         new_cred.set_privileges(rights)
  92         new_cred.set_delegate(True)
  93
  94         auth_kind = "authority,ma,sa"
  95         new_cred.set_parent(self.api.auth.hierarchy.get_auth_cred(auth_hrn, kind=auth_kind))
  96
  97         new_cred.encode()
  98         new_cred.sign()
  99
 100         return new_cred.save_to_string(save_parents=True)
 101