def verify_chain(self, trusted_certs = None):
# do the normal certificate verification stuff
trusted_root = Certificate.verify_chain(self, trusted_certs)
if self.parent:
# make sure the parent's hrn is a prefix of the child's hrn
if not hrn_authfor_hrn(self.parent.get_hrn(), self.get_hrn()):
raise GidParentHrn("This cert HRN %s isn't in the namespace for parent HRN %s" % (self.get_hrn(), self.parent.get_hrn()))
# Parent must also be an authority (of some type) to sign a GID
# There are multiple types of authority - accept them all here
if not self.parent.get_type().find('authority') == 0:
raise GidInvalidParentHrn("This cert %s's parent %s is not an authority (is a %s)" % (self.get_hrn(), self.parent.get_hrn(), self.parent.get_type()))
# Then recurse up the chain - ensure the parent is a trusted
# root or is in the namespace of a trusted root
self.parent.verify_chain(trusted_certs)
else:
# make sure that the trusted root's hrn is a prefix of the child's
trusted_gid = GID(string=trusted_root.save_to_string())
trusted_type = trusted_gid.get_type()
trusted_hrn = trusted_gid.get_hrn()
#if trusted_type == 'authority':
# trusted_hrn = trusted_hrn[:trusted_hrn.rindex('.')]
cur_hrn = self.get_hrn()
if not hrn_authfor_hrn(trusted_hrn, cur_hrn):
raise GidParentHrn("Trusted root with HRN %s isn't a namespace authority for this cert: %s" % (trusted_hrn, cur_hrn))
# There are multiple types of authority - accept them all here
if not trusted_type.find('authority') == 0:
raise GidInvalidParentHrn("This cert %s's trusted root signer %s is not an authority (is a %s)" % (self.get_hrn(), trusted_hrn, trusted_type))
return
def verify_issuer(self, trusted_gids):
root_cred = self.get_credential_list()[-1]
root_target_gid = root_cred.get_gid_object()
root_cred_signer = root_cred.get_signature().get_issuer_gid()
# Case 1:
# Allow non authority to sign target and cred about target.
#
# Why do we need to allow non authorities to sign?
# If in the target gid validation step we correctly
# checked that the target is only signed by an authority,
# then this is just a special case of case 3.
# This short-circuit is the common case currently -
# and cause GID validation doesn't check 'authority',
# this allows users to generate valid slice credentials.
if root_target_gid.is_signed_by_cert(root_cred_signer):
# cred signer matches target signer, return success
return
# Case 2:
# Allow someone to sign credential about themeselves. Used?
# If not, remove this.
#root_target_gid_str = root_target_gid.save_to_string()
#root_cred_signer_str = root_cred_signer.save_to_string()
#if root_target_gid_str == root_cred_signer_str:
# # cred signer is target, return success
# return
# Case 3:
# root_cred_signer is not the target_gid
# So this is a different gid that we have not verified.
# xmlsec1 verified the cert chain on this already, but
# it hasn't verified that the gid meets the HRN namespace
# requirements.
# Below we'll ensure that it is an authority.
# But we haven't verified that it is _signed by_ an authority
# We also don't know if xmlsec1 requires that cert signers
# are marked as CAs.
# Note that if verify() gave us no trusted_gids then this
# call will fail. So skip it if we have no trusted_gids
if trusted_gids and len(trusted_gids) > 0:
root_cred_signer.verify_chain(trusted_gids)
else:
print "No trusted gids. Cannot verify that cred signer is signed by a trusted authority. Skipping that check."
# See if the signer is an authority over the domain of the target.
# There are multiple types of authority - accept them all here
# Maybe should be (hrn, type) = urn_to_hrn(root_cred_signer.get_urn())
root_cred_signer_type = root_cred_signer.get_type()
if (root_cred_signer_type.find('authority') == 0):
#logger.debug('Cred signer is an authority')
# signer is an authority, see if target is in authority's domain
signerhrn = root_cred_signer.get_hrn()
if hrn_authfor_hrn(signerhrn, root_target_gid.get_hrn()):
return
# We've required that the credential be signed by an authority
# for that domain. Reasonable and probably correct.
# A looser model would also allow the signer to be an authority
# in my control framework - eg My CA or CH. Even if it is not
# the CH that issued these, eg, user credentials.
# Give up, credential does not pass issuer verification
raise CredentialNotVerifiable("Could not verify credential owned by %s for object %s. Cred signer %s not the trusted authority for Cred target %s" % (self.gidCaller.get_urn(), self.gidObject.get_urn(), root_cred_signer.get_hrn(), root_target_gid.get_hrn()))