util/hierarchy.py

   1 # hierarchy.py
   2 #
   3 # hierarchy of GENI authorities
   4 #
   5 # This correspond's almost identically to the functionality of Soner's
   6 # "tree" module. Each component of an HRN is stored in a different subdirectory.
   7 # Inside this subdirectory are:
   8 #      *.GID - GID file
   9 #      *.PKEY - private key file
  10 #      *.DBINFO - database info
  11
  12 import os
  13 from cert import *
  14 from gid import *
  15 from misc import *
  16 from config import *
  17
  18 class AuthInfo():
  19     hrn = None
  20     gid_filename = None
  21     privkey_filename = None
  22     dbinfo_filename = None
  23
  24     def __init__(self, hrn, gid_filename, privkey_filename, dbinfo_filename):
  25         self.hrn = hrn
  26         self.gid_filename = gid_filename
  27         self.privkey_filename = privkey_filename
  28         self.dbinfo_filename = dbinfo_filename
  29
  30     def get_gid_object(self):
  31         return GID(filename = self.gid_filename)
  32
  33     def get_pkey_object(self):
  34         return Keypair(filename = self.privkey_filename)
  35
  36     def get_dbinfo(self):
  37         f = file(self.dbinfo_filename)
  38         dict = eval(f.read())\r
  39         f.close()\r
  40         return dict\r
  41
  42 class Hierarchy():
  43     def __init__(self, basedir="."):
  44         self.basedir = basedir
  45
  46     # type = sa|ma
  47     def get_auth_info(self, hrn, type, can_create=True):
  48         leaf = get_leaf(hrn)
  49         parent_hrn = get_authority(hrn)
  50         directory = os.path.join(self.basedir,
  51                         os.path.join(type, hrn.replace(".", "/")))
  52
  53         gid_filename = os.path.join(directory, leaf+".gid")
  54         privkey_filename = os.path.join(directory, leaf+".pkey")
  55         dbinfo_filename = os.path.join(directory, leaf+".dbinfo")
  56
  57         if (not os.path.exists(gid_filename)) or \
  58            (not os.path.exists(privkey_filename)) or \
  59            (not os.path.exists(dbinfo_filename)):
  60             if not can_create:
  61                 return MissingAuthorityFiles(hrn)
  62
  63             # create the directory to hold the files
  64             try:
  65                 os.makedirs(directory)\r
  66             # if the path already exists then pass\r
  67             except OSError, (errno, strerr):\r
  68                 if errno == 17:\r
  69                     pass
  70
  71             pkey = Keypair(create = True)
  72             pkey.save_to_file(privkey_filename)
  73
  74             gid = self.create_gid(type, hrn, create_uuid(), pkey)
  75             gid.save_to_file(gid_filename)
  76
  77             # XXX TODO: think up a better way for the dbinfo to work
  78
  79             dbinfo = get_default_dbinfo()
  80             dbinfo_file = file(dbinfo_filename, "w")
  81             dbinfo_file.write(str(dbinfo))\r
  82             dbinfo_file.close()\r
  83
  84         auth_info = AuthInfo(hrn, gid_filename, privkey_filename, dbinfo_filename)
  85
  86         return auth_info
  87
  88     def create_gid(self, type, hrn, uuid, pkey):
  89         parent_hrn = get_authority(hrn)
  90
  91         gid = GID(subject=hrn, uuid=uuid)
  92
  93         if not parent_hrn:
  94             # if there is no parent hrn, then it must be self-signed. this
  95             # is where we terminate the recursion
  96             gid.set_issuer(pkey, hrn)
  97         else:
  98             # we need the parent's private key in order to sign this GID
  99             parent_auth_info = self.get_auth_info(parent_hrn, type)
 100             gid.set_issuer(parent_auth_info.get_pkey_object(), parent_auth_info.hrn)
 101             gid.set_parent(parent_auth_info.get_gid_object())
 102
 103         gid.set_pubkey(pkey)
 104         gid.sign()
 105
 106         return gid
 107
 108     def refresh_gid(self, type, gid, hrn=None, uuid=None, pubkey=None):
 109         # TODO: compute expiration time of GID, refresh it if necessary
 110         gid_is_expired = False
 111
 112         # update the gid if we need to
 113         if gid_is_expired or hrn or uuid or pubkey:
 114             if not hrn:
 115                 hrn = gid.get_hrn()
 116             if not uuid:
 117                 uuid = gid.get_uuid()
 118             if not pubkey:
 119                 pubkey = gid.get_pubkey()
 120
 121             gid = self.create_gid(type, hrn, uuid, pubkey)
 122
 123         return gid
 124