# Credentials are signed XML files that assign a subject gid privileges to an object gid
##
-### $Id$
-### $URL$
-
import os
import datetime
-from xml.dom.minidom import Document, parseString
from tempfile import mkstemp
-from sfa.trust.certificate import Keypair
-from sfa.trust.credential_legacy import CredentialLegacy
-from sfa.trust.rights import *
-from sfa.trust.gid import *
-from sfa.util.faults import *
+import dateutil.parser
+from StringIO import StringIO
+from xml.dom.minidom import Document, parseString
+from lxml import etree
+from sfa.util.faults import *
from sfa.util.sfalogging import logger
-from dateutil.parser import parse
-
-
+from sfa.trust.certificate import Keypair
+from sfa.trust.credential_legacy import CredentialLegacy
+from sfa.trust.rights import Right, Rights
+from sfa.trust.gid import GID
+from sfa.util.xrn import urn_to_hrn
-# Two years, in seconds
-DEFAULT_CREDENTIAL_LIFETIME = 60 * 60 * 24 * 365 * 2
+# 2 weeks, in seconds
+DEFAULT_CREDENTIAL_LIFETIME = 86400 * 14
# TODO:
# Convert a string into a bool
def str2bool(str):
- if str.lower() in ['yes','true','1']:
+ if str.lower() in ['true','1']:
return True
return False
# not be changed else the signature is no longer valid. So, once
# you have loaded an existing signed credential, do not call encode() or sign() on it.
+def filter_creds_by_caller(creds, caller_hrn):
+ """
+ Returns a list of creds who's gid caller matches the
+ specified caller hrn
+ """
+ if not isinstance(creds, list): creds = [creds]
+ caller_creds = []
+ for cred in creds:
+ try:
+ tmp_cred = Credential(string=cred)
+ if tmp_cred.get_gid_caller().get_hrn() == caller_hrn:
+ caller_creds.append(cred)
+ except: pass
+ return caller_creds
+
class Credential(object):
##
str = string
elif filename:
str = file(filename).read()
+ self.filename=filename
if str.strip().startswith("-----"):
self.legacy = CredentialLegacy(False,string=str)
self.gidObject = legacy.get_gid_object()
lifetime = legacy.get_lifetime()
if not lifetime:
- # Default to two years
- self.set_lifetime(DEFAULT_CREDENTIAL_LIFETIME)
+ self.set_expiration(datetime.datetime.utcnow() + datetime.timedelta(seconds=DEFAULT_CREDENTIAL_LIFETIME))
else:
- self.set_lifetime(int(lifetime))
+ self.set_expiration(int(lifetime))
self.lifeTime = legacy.get_lifetime()
self.set_privileges(legacy.get_privileges())
self.get_privileges().delegate_all_privileges(legacy.get_delegate())
self.decode()
return self.gidObject
+
+
##
- # set the lifetime of this credential
- #
- # @param lifetime lifetime of credential
- # . if lifeTime is a datetime object, it is used for the expiration time
- # . if lifeTime is an integer value, it is considered the number of seconds
- # remaining before expiration
-
- def set_lifetime(self, lifeTime):
- if isinstance(lifeTime, int):
- self.expiration = datetime.timedelta(seconds=lifeTime) + datetime.datetime.utcnow()
+ # Expiration: an absolute UTC time of expiration (as either an int or datetime)
+ #
+ def set_expiration(self, expiration):
+ if isinstance(expiration, int):
+ self.expiration = datetime.datetime.fromtimestamp(expiration)
else:
- self.expiration = lifeTime
+ self.expiration = expiration
+
##
# get the lifetime of the credential (in datetime format)
- def get_lifetime(self):
+ def get_expiration(self):
if not self.expiration:
self.decode()
return self.expiration
+ ##
+ # For legacy sake
+ def get_lifetime(self):
+ return self.get_expiration()
##
# set the privileges
#
- # @param privs either a comma-separated list of privileges of a RightList object
+ # @param privs either a comma-separated list of privileges of a Rights object
def set_privileges(self, privs):
if isinstance(privs, str):
- self.privileges = RightList(string = privs)
+ self.privileges = Rights(string = privs)
else:
self.privileges = privs
##
- # return the privileges as a RightList object
+ # return the privileges as a Rights object
def get_privileges(self):
if not self.privileges:
append_sub(doc, cred, "target_urn", self.gidObject.get_urn())
append_sub(doc, cred, "uuid", "")
if not self.expiration:
- self.set_lifetime(DEFAULT_CREDENTIAL_LIFETIME)
+ self.set_expiration(datetime.datetime.utcnow() + datetime.timedelta(seconds=DEFAULT_CREDENTIAL_LIFETIME))
self.expiration = self.expiration.replace(microsecond=0)
append_sub(doc, cred, "expires", self.expiration.isoformat())
privileges = doc.createElement("privileges")
f = open(filename, "w")
f.write(self.xml)
f.close()
+ self.filename=filename
def save_to_string(self, save_parents=True):
if not self.xml:
self.set_refid(cred.getAttribute("xml:id"))
- self.set_lifetime(parse(getTextNode(cred, "expires")))
+ self.set_expiration(dateutil.parser.parse(getTextNode(cred, "expires")))
self.gidCaller = GID(string=getTextNode(cred, "owner_gid"))
self.gidObject = GID(string=getTextNode(cred, "target_gid"))
# Process privileges
privs = cred.getElementsByTagName("privileges")[0]
- rlist = RightList()
+ rlist = Rights()
for priv in privs.getElementsByTagName("privilege"):
kind = getTextNode(priv, "name")
deleg = str2bool(getTextNode(priv, "can_delegate"))
# must be done elsewhere
#
# @param trusted_certs: The certificates of trusted CA certificates
- def verify(self, trusted_certs):
+ # @param schema: The RelaxNG schema to validate the credential against
+ def verify(self, trusted_certs, schema=None):
if not self.xml:
self.decode()
+
+ # validate against RelaxNG schema
+ if not self.legacy:
+ if schema and os.path.exists(schema):
+ tree = etree.parse(StringIO(self.xml))
+ schema_doc = etree.parse(schema)
+ xmlschema = etree.XMLSchema(schema_doc)
+ if not xmlschema.validate(tree):
+ error = xmlschema.error_log.last_error
+ message = "%s (line %s)" % (error.message, error.line)
+ raise CredentialNotVerifiable(message)
+
-# trusted_cert_objects = [GID(filename=f) for f in trusted_certs]
+# trusted_cert_objects = [GID(filename=f) for f in trusted_certs]
trusted_cert_objects = []
ok_trusted_certs = []
for f in trusted_certs:
trusted_cert_objects.append(GID(filename=f))
ok_trusted_certs.append(f)
except Exception, exc:
- logger.error("Failed to load trusted cert from %s: %r", f, exc)
+ logger.error("Failed to load trusted cert from %s: %r"%( f, exc))
trusted_certs = ok_trusted_certs
# Use legacy verification if this is a legacy credential
if self.legacy.object_gid:
self.legacy.object_gid.verify_chain(trusted_cert_objects)
return True
+
# make sure it is not expired
- if self.get_lifetime() < datetime.datetime.utcnow():
+ if self.get_expiration() < datetime.datetime.utcnow():
raise CredentialNotVerifiable("Credential expired at %s" % self.expiration.isoformat())
# Verify the signatures
raise CredentialNotVerifiable("Target gid not equal between parent and child")
# make sure my expiry time is <= my parent's
- if not parent_cred.get_lifetime() >= self.get_lifetime():
+ if not parent_cred.get_expiration() >= self.get_expiration():
raise CredentialNotVerifiable("Delegated credential expires after parent")
# make sure my signer is the parent's caller
parent_cred.verify_parent(parent_cred.parent)
- def delegate(self, delegee_gid, keyfile):
+ def delegate(self, delegee_gidfile, caller_keyfile, caller_gidfile):
"""
Return a delegated copy of this credential, delegated to the
specified gid's user.
"""
# get the gid of the object we are delegating
object_gid = self.get_gid_object()
- object_hrn = self.get_hrn()
+ object_hrn = object_gid.get_hrn()
# the hrn of the user who will be delegated to
- if isinstance(delegee_gid, str):
- delegee_gid = GID(string=records[0]['gid'])
+ delegee_gid = GID(filename=delegee_gidfile)
delegee_hrn = delegee_gid.get_hrn()
-
- user_key = Keypair(filename=keyfile)
- user_hrn = self.get_gid_caller().get_hrn()
+
+ #user_key = Keypair(filename=keyfile)
+ #user_hrn = self.get_gid_caller().get_hrn()
subject_string = "%s delegated to %s" % (object_hrn, delegee_hrn)
dcred = Credential(subject=subject_string)
dcred.set_gid_caller(delegee_gid)
dcred.set_gid_object(object_gid)
- privs = self.get_privileges()
+ dcred.set_parent(self)
+ dcred.set_expiration(self.get_expiration())
dcred.set_privileges(self.get_privileges())
dcred.get_privileges().delegate_all_privileges(True)
- dcred.set_pubkey(object_gid.get_pubkey())
- dcred.set_issuer(user_key, user_hrn)
- dcred.set_parent(self)
+ #dcred.set_issuer_keys(keyfile, delegee_gidfile)
+ dcred.set_issuer_keys(caller_keyfile, caller_gidfile)
dcred.encode()
dcred.sign()
return dcred
- ##
- # Dump the contents of a credential to stdout in human-readable format
- #
- # @param dump_parents If true, also dump the parent certificates
-
- def dump(self, dump_parents=False):
- print "CREDENTIAL", self.get_subject()
- print " privs:", self.get_privileges().save_to_string()
+ # only informative
+ def get_filename(self):
+ return getattr(self,'filename',None)
- print " gidCaller:"
+ # @param dump_parents If true, also dump the parent certificates
+ def dump (self, *args, **kwargs):
+ print self.dump_string(*args, **kwargs)
+
+ def dump_string(self, dump_parents=False):
+ result=""
+ result += "CREDENTIAL %s\n" % self.get_subject()
+ filename=self.get_filename()
+ if filename: result += "Filename %s\n"%filename
+ result += " privs: %s\n" % self.get_privileges().save_to_string()
gidCaller = self.get_gid_caller()
if gidCaller:
- gidCaller.dump(8, dump_parents)
+ result += " gidCaller:\n"
+ result += gidCaller.dump_string(8, dump_parents)
+
+ if self.get_signature():
+ print " gidIssuer:"
+ self.get_signature().get_issuer_gid().dump(8, dump_parents)
- print " gidObject:"
gidObject = self.get_gid_object()
if gidObject:
- gidObject.dump(8, dump_parents)
-
+ result += " gidObject:\n"
+ result += gidObject.dump_string(8, dump_parents)
if self.parent and dump_parents:
- print "PARENT",
- self.parent.dump_parents()
+ result += "\nPARENT"
+ result += self.parent.dump(True)
+
+ return result
git://git.onelab.eu / sfa.git / blobdiff