2 # Implements GENI GID. GIDs are based on certificates, and the GID class is a
3 # descendant of the certificate class.
12 from sfa.trust.certificate import Certificate
15 # Create a new uuid. Returns the UUID as a string.
18 return str(uuid.uuid4().int)
22 # (uuid, hrn, public_key)
24 # UUID is a unique identifier and is created by the python uuid module
25 # (or the utility function create_uuid() in gid.py).
27 # HRN is a human readable name. It is a dotted form similar to a backward domain
28 # name. For example, planetlab.us.arizona.bakers.
30 # PUBLIC_KEY is the public key of the principal identified by the UUID/HRN.
31 # It is a Keypair object as defined in the cert.py module.
33 # It is expected that there is a one-to-one pairing between UUIDs and HRN,
34 # but it is uncertain how this would be inforced or if it needs to be enforced.
36 # These fields are encoded using xmlrpc into the subjectAltName field of the
37 # x509 certificate. Note: Call encode() once the fields have been filled in
38 # to perform this encoding.
41 class GID(Certificate):
46 # Create a new GID object
48 # @param create If true, create the X509 certificate
49 # @param subject If subject!=None, create the X509 cert and set the subject name
50 # @param string If string!=None, load the GID from a string
51 # @param filename If filename!=None, load the GID from a file
53 def __init__(self, create=False, subject=None, string=None, filename=None, uuid=None, hrn=None):
54 Certificate.__init__(self, create, subject, string, filename)
60 def set_uuid(self, uuid):
68 def set_hrn(self, hrn):
77 # Encode the GID fields and package them into the subject-alt-name field
78 # of the X509 certificate. This must be called prior to signing the
79 # certificate. It may only be called once per certificate.
82 dict = {"uuid": self.uuid,
84 str = xmlrpclib.dumps((dict,))
88 # Decode the subject-alt-name field of the X509 certificate into the
89 # fields of the GID. This is automatically called by the various get_*()
90 # functions in this class.
93 data = self.get_data()
95 dict = xmlrpclib.loads(self.get_data())[0][0]
99 self.uuid = dict.get("uuid", None)
100 self.hrn = dict.get("hrn", None)
103 # Dump the credential to stdout.
105 # @param indent specifies a number of spaces to indent the output
106 # @param dump_parents If true, also dump the parents of the GID
108 def dump(self, indent=0, dump_parents=False):
109 print " "*indent, " hrn:", self.get_hrn()
110 print " "*indent, "uuid:", self.get_uuid()
112 if self.parent and dump_parents:
113 print " "*indent, "parent:"
114 self.parent.dump(indent+4)
117 # Verify the chain of authenticity of the GID. First perform the checks
118 # of the certificate class (verifying that each parent signs the child,
119 # etc). In addition, GIDs also confirm that the parent's HRN is a prefix
120 # of the child's HRN.
122 # Verifying these prefixes prevents a rogue authority from signing a GID
123 # for a principal that is not a member of that authority. For example,
124 # planetlab.us.arizona cannot sign a GID for planetlab.us.princeton.foo.
126 def verify_chain(self, trusted_certs = None):
127 # do the normal certificate verification stuff
128 Certificate.verify_chain(self, trusted_certs)
131 # make sure the parent's hrn is a prefix of the child's hrn
132 if not self.get_hrn().startswith(self.parent.get_hrn()):
133 raise GidParentHrn(self.parent.get_subject())