def __init__(self, peer_cert = None, config = None ):
self.peer_cert = peer_cert
if not config:
self.config = CONFIG#Config()
else:
self.config = config
self.hierarchy = Hierarchy(self.config)
self.load_trusted_certs()
class Auth:
"""
Credential based authentication
"""
def __init__(self, peer_cert = None, config = None ):
self.peer_cert = peer_cert
if not config:
self.config = CONFIG#Config()
else:
self.config = config
self.hierarchy = Hierarchy(self.config)
self.load_trusted_certs()
def load_trusted_certs(self):
self.trusted_cert_list = TrustedRoots(self.config.TRUSTED_ROOTS_DIR).get_list()
self.trusted_cert_file_list = TrustedRoots(self.config.TRUSTED_ROOTS_DIR).get_file_list()
def checkCredentials(self, creds, operation, hrn = None):
valid = []
error = None
if not isinstance(creds, list):
creds = [creds]
for cred in creds:
try:
self.check(cred, operation, hrn)
valid.append(cred)
except Exception as e:
cred_obj=Credential(string=cred)
error = e#sys.exc_info()[:2]
continue
if not len(valid):
if not error:
error = "No valid credentials found"
raise InsufficientRights('Access denied: %s' % (str(error)))
return valid
def check(self, cred, operation, hrn = None):
"""
Check the credential against the peer cert (callerGID included
in the credential matches the caller that is connected to the
HTTPS connection, check if the credential was signed by a
trusted cert and check if the credential is allowed to perform
the specified operation.
"""
self.client_cred = Credential(string = cred)
self.client_gid = self.client_cred.get_gid_caller()
self.object_gid = self.client_cred.get_gid_object()
# make sure the client_gid is not blank
if not self.client_gid:
raise MissingCallerGID(self.client_cred.get_subject())
# validate the client cert if it exists
if self.peer_cert:
self.verifyPeerCert(self.peer_cert, self.client_gid)
# make sure the client is allowed to perform the operation
if operation:
if not self.client_cred.can_perform(operation):
raise InsufficientRights(operation)
if self.trusted_cert_list:
self.client_cred.verify(self.trusted_cert_file_list, self.config.SFA_CREDENTIAL_SCHEMA)
else:
raise MissingTrustedRoots(self.config.get_trustedroots_dir())
# Make sure the credential's target matches the specified hrn.
# This check does not apply to trusted peers
trusted_peers = [gid.get_hrn() for gid in self.trusted_cert_list]
if hrn and self.client_gid.get_hrn() not in trusted_peers:
target_hrn = self.object_gid.get_hrn()
if not hrn == target_hrn:
raise PermissionError("Target hrn: %s doesn't match specified hrn: %s " % \
(target_hrn, hrn) )
return True
def check_ticket(self, ticket):
"""
Check if the tickt was signed by a trusted cert
"""
if self.trusted_cert_list:
client_ticket = SfaTicket(string=ticket)
client_ticket.verify_chain(self.trusted_cert_list)
else:
raise MissingTrustedRoots(self.config.get_trustedroots_dir())
return True
def verifyPeerCert(self, cert, gid):
# make sure the client_gid matches client's certificate
if not cert.is_pubkey(gid.get_pubkey()):
raise ConnectionKeyGIDMismatch(gid.get_subject()+":"+cert.get_subject())
def verifyGidRequestHash(self, gid, hash, arglist):
key = gid.get_pubkey()
if not key.verify_string(str(arglist), hash):
raise BadRequestHash(hash)
def verifyCredRequestHash(self, cred, hash, arglist):
gid = cred.get_gid_caller()
self.verifyGidRequestHash(gid, hash, arglist)
def validateGid(self, gid):
if self.trusted_cert_list:
gid.verify_chain(self.trusted_cert_list)
def validateCred(self, cred):
if self.trusted_cert_list:
cred.verify(self.trusted_cert_file_list)
def authenticateGid(self, gidStr, argList, requestHash=None):
gid = GID(string = gidStr)
self.validateGid(gid)
# request_hash is optional
if requestHash:
self.verifyGidRequestHash(gid, requestHash, argList)
return gid
def authenticateCred(self, credStr, argList, requestHash=None):
cred = Credential(string = credStr)
self.validateCred(cred)
# request hash is optional
if requestHash:
self.verifyCredRequestHash(cred, requestHash, argList)
return cred
def authenticateCert(self, certStr, requestHash):
cert = Certificate(string=certStr)
# xxx should be validateCred ??
self.validateCred(cert)
def gidNoop(self, gidStr, value, requestHash):
self.authenticateGid(gidStr, [gidStr, value], requestHash)
return value
def credNoop(self, credStr, value, requestHash):
self.authenticateCred(credStr, [credStr, value], requestHash)
return value
def verify_cred_is_me(self, credential):
cred = Credential(string=credential)
caller_gid = cred.get_gid_caller()
caller_hrn = caller_gid.get_hrn()
if caller_hrn != self.config.SFA_INTERFACE_HRN:
raise SfaPermissionDenied(self.config.SFA_INTEFACE_HRN)
return
def get_auth_info(self, auth_hrn):
"""
Given an authority name, return the information for that authority.
This is basically a stub that calls the hierarchy module.
@param auth_hrn human readable name of authority
"""
return self.hierarchy.get_auth_info(auth_hrn)
def veriry_auth_belongs_to_me(self, name):
"""
Verify that an authority belongs to our hierarchy.
This is basically left up to the implementation of the hierarchy
module. If the specified name does not belong, ane exception is
thrown indicating the caller should contact someone else.
@param auth_name human readable name of authority
"""
# get auth info will throw an exception if the authority doesnt exist
self.get_auth_info(name)
def verify_object_belongs_to_me(self, name):
"""
Verify that an object belongs to our hierarchy. By extension,
this implies that the authority that owns the object belongs
to our hierarchy. If it does not an exception is thrown.
@param name human readable name of object
"""
auth_name = self.get_authority(name)
if not auth_name:
auth_name = name
if name == self.config.SFA_INTERFACE_HRN:
return
self.verify_auth_belongs_to_me(auth_name)
def verify_auth_belongs_to_me(self, name):
# get auth info will throw an exception if the authority doesnt exist
self.get_auth_info(name)
def verify_object_permission(self, name):
"""
Verify that the object gid that was specified in the credential
allows permission to the object 'name'. This is done by a simple
prefix test. For example, an object_gid for plc.arizona would
match the objects plc.arizona.slice1 and plc.arizona.
@param name human readable name to test
"""
object_hrn = self.object_gid.get_hrn()
if object_hrn == name:
return
if name.startswith(object_hrn + "."):
return
#if name.startswith(get_authority(name)):
#return
raise PermissionError(name)
def determine_user_rights(self, caller_hrn, reg_record):
"""
Given a user credential and a record, determine what set of rights the
user should have to that record.
This is intended to replace determine_user_rights() and
verify_cancreate_credential()
"""
rl = Rights()
type = reg_record.type
if type == 'slice':
# researchers in the slice are in the DB as-is
researcher_hrns = [ user.hrn for user in reg_record.reg_researchers ]
# locating PIs attached to that slice
slice_pis=reg_record.get_pis()
pi_hrns = [ user.hrn for user in slice_pis ]
if (caller_hrn in researcher_hrns + pi_hrns):
rl.add('refresh')
rl.add('embed')
rl.add('bind')
rl.add('control')
rl.add('info')
elif type == 'authority':
pi_hrns = [ user.hrn for user in reg_record.reg_pis ]
if (caller_hrn == self.config.SFA_INTERFACE_HRN):
rl.add('authority')
rl.add('sa')
rl.add('ma')
if (caller_hrn in pi_hrns):
rl.add('authority')
rl.add('sa')
# NOTE: for the PL implementation, this 'operators' list
# amounted to users with 'tech' role in that site
# it seems like this is not needed any longer, so for now I just drop that
# operator_hrns = reg_record.get('operator',[])
# if (caller_hrn in operator_hrns):
# rl.add('authority')
# rl.add('ma')
elif type == 'user':
rl.add('refresh')
rl.add('resolve')
rl.add('info')
elif type == 'node':
rl.add('operator')
return rl
def get_authority(self, hrn):
return get_authority(hrn)
def filter_creds_by_caller(self, creds, caller_hrn_list):
"""
Returns a list of creds who's gid caller matches the
specified caller hrn
"""
if not isinstance(creds, list):
creds = [creds]
creds = []
if not isinstance(caller_hrn_list, list):
caller_hrn_list = [caller_hrn_list]
for cred in creds:
try:
tmp_cred = Credential(string=cred)
if tmp_cred.get_gid_caller().get_hrn() in [caller_hrn_list]:
creds.append(cred)
except: pass
return creds