def decode(self):
data = self.get_data().lstrip('URI:http://')
if data:
dict = xmlrpclib.loads(data)[0][0]
else:
dict = {}
self.lifeTime = dict.get("lifeTime", None)
self.delegate = dict.get("delegate", None)
privStr = dict.get("privileges", None)
if privStr:
self.privileges = Rights(string=privStr)
else:
self.privileges = None
gidCallerStr = dict.get("gidCaller", None)
if gidCallerStr:
self.gidCaller = GID(string=gidCallerStr)
else:
self.gidCaller = None
gidObjectStr = dict.get("gidObject", None)
if gidObjectStr:
self.gidObject = GID(string=gidObjectStr)
else:
self.gidObject = None
def decode(self):
data = self.get_data().lstrip("URI:http://")
if data:
dict = xmlrpclib.loads(data)[0][0]
else:
dict = {}
self.lifeTime = dict.get("lifeTime", None)
self.delegate = dict.get("delegate", None)
privStr = dict.get("privileges", None)
if privStr:
self.privileges = Rights(string=privStr)
else:
self.privileges = None
gidCallerStr = dict.get("gidCaller", None)
if gidCallerStr:
self.gidCaller = GID(string=gidCallerStr)
else:
self.gidCaller = None
gidObjectStr = dict.get("gidObject", None)
if gidObjectStr:
self.gidObject = GID(string=gidObjectStr)
else:
self.gidObject = None
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
logger.debug("entering determine_user_rights with record %s and caller_hrn %s"%\
(reg_record, caller_hrn))
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 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
logger.debug(
"entering determine_user_rights with record %s and caller_hrn %s" %
(reg_record, caller_hrn))
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 decode(self):
if not self.xml:
return
doc = parseString(self.xml)
sigs = []
signed_cred = doc.getElementsByTagName("signed-credential")
# Is this a signed-cred or just a cred?
if len(signed_cred) > 0:
creds = signed_cred[0].getElementsByTagName("credential")
signatures = signed_cred[0].getElementsByTagName("signatures")
if len(signatures) > 0:
sigs = signatures[0].getElementsByTagName("Signature")
else:
creds = doc.getElementsByTagName("credential")
if creds is None or len(creds) == 0:
# malformed cred file
raise CredentialNotVerifiable("Malformed XML: No credential tag found")
# Just take the first cred if there are more than one
cred = creds[0]
self.set_refid(cred.getAttribute("xml:id"))
self.set_expiration(utcparse(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 = Rights()
for priv in privs.getElementsByTagName("privilege"):
kind = getTextNode(priv, "name")
deleg = str2bool(getTextNode(priv, "can_delegate"))
if kind == "*":
# Convert * into the default privileges for the credential's type
# Each inherits the delegatability from the * above
_, type = urn_to_hrn(self.gidObject.get_urn())
rl = determine_rights(type, self.gidObject.get_urn())
for r in rl.rights:
r.delegate = deleg
rlist.add(r)
else:
rlist.add(Right(kind.strip(), deleg))
self.set_privileges(rlist)
# Is there a parent?
parent = cred.getElementsByTagName("parent")
if len(parent) > 0:
parent_doc = parent[0].getElementsByTagName("credential")[0]
parent_xml = parent_doc.toxml()
self.parent = Credential(string=parent_xml)
self.updateRefID()
# Assign the signatures to the credentials
for sig in sigs:
Sig = Signature(string=sig.toxml())
for cur_cred in self.get_credential_list():
if cur_cred.get_refid() == Sig.get_refid():
cur_cred.set_signature(Sig)
class CredentialLegacy(Certificate):
gidCaller = None
gidObject = None
lifeTime = None
privileges = None
delegate = False
##
# Create a Credential object
#
# @param create If true, create a blank x509 certificate
# @param subject If subject!=None, create an x509 cert with the subject name
# @param string If string!=None, load the credential from the string
# @param filename If filename!=None, load the credential from the file
def __init__(self, create=False, subject=None, string=None, filename=None):
Certificate.__init__(self, create, subject, string, filename)
##
# set the GID of the caller
#
# @param gid GID object of the caller
def set_gid_caller(self, gid):
self.gidCaller = gid
# gid origin caller is the caller's gid by default
self.gidOriginCaller = gid
##
# get the GID of the object
def get_gid_caller(self):
if not self.gidCaller:
self.decode()
return self.gidCaller
##
# set the GID of the object
#
# @param gid GID object of the object
def set_gid_object(self, gid):
self.gidObject = gid
##
# get the GID of the object
def get_gid_object(self):
if not self.gidObject:
self.decode()
return self.gidObject
##
# set the lifetime of this credential
#
# @param lifetime lifetime of credential
def set_lifetime(self, lifeTime):
self.lifeTime = lifeTime
##
# get the lifetime of the credential
def get_lifetime(self):
if not self.lifeTime:
self.decode()
return self.lifeTime
##
# set the delegate bit
#
# @param delegate boolean (True or False)
def set_delegate(self, delegate):
self.delegate = delegate
##
# get the delegate bit
def get_delegate(self):
if not self.delegate:
self.decode()
return self.delegate
##
# set the privileges
#
# @param privs either a comma-separated list of privileges of a Rights object
def set_privileges(self, privs):
if isinstance(privs, str):
self.privileges = Rights(string=privs)
else:
self.privileges = privs
##
# return the privileges as a Rights object
def get_privileges(self):
if not self.privileges:
self.decode()
return self.privileges
##
# determine whether the credential allows a particular operation to be
# performed
#
# @param op_name string specifying name of operation ("lookup", "update", etc)
def can_perform(self, op_name):
rights = self.get_privileges()
if not rights:
return False
return rights.can_perform(op_name)
##
# Encode the attributes of the credential into a string and store that
# string in the alt-subject-name field of the X509 object. This should be
# done immediately before signing the credential.
def encode(self):
dict = {
"gidCaller": None,
"gidObject": None,
"lifeTime": self.lifeTime,
"privileges": None,
"delegate": self.delegate
}
if self.gidCaller:
dict["gidCaller"] = self.gidCaller.save_to_string(
save_parents=True)
if self.gidObject:
dict["gidObject"] = self.gidObject.save_to_string(
save_parents=True)
if self.privileges:
dict["privileges"] = self.privileges.save_to_string()
str = xmlrpclib.dumps((dict, ), allow_none=True)
self.set_data('URI:http://' + str)
##
# Retrieve the attributes of the credential from the alt-subject-name field
# of the X509 certificate. This is automatically done by the various
# get_* methods of this class and should not need to be called explicitly.
def decode(self):
data = self.get_data().lstrip('URI:http://')
if data:
dict = xmlrpclib.loads(data)[0][0]
else:
dict = {}
self.lifeTime = dict.get("lifeTime", None)
self.delegate = dict.get("delegate", None)
privStr = dict.get("privileges", None)
if privStr:
self.privileges = Rights(string=privStr)
else:
self.privileges = None
gidCallerStr = dict.get("gidCaller", None)
if gidCallerStr:
self.gidCaller = GID(string=gidCallerStr)
else:
self.gidCaller = None
gidObjectStr = dict.get("gidObject", None)
if gidObjectStr:
self.gidObject = GID(string=gidObjectStr)
else:
self.gidObject = None
##
# Verify that a chain of credentials is valid (see cert.py:verify). In
# addition to the checks for ordinary certificates, verification also
# ensures that the delegate bit was set by each parent in the chain. If
# a delegate bit was not set, then an exception is thrown.
#
# Each credential must be a subset of the rights of the parent.
def verify_chain(self, trusted_certs=None):
# do the normal certificate verification stuff
Certificate.verify_chain(self, trusted_certs)
if self.parent:
# make sure the parent delegated rights to the child
if not self.parent.get_delegate():
raise MissingDelegateBit(self.parent.get_subject())
# make sure the rights given to the child are a subset of the
# parents rights
if not self.parent.get_privileges().is_superset(
self.get_privileges()):
raise ChildRightsNotSubsetOfParent(
self.get_subject() + " " +
self.parent.get_privileges().save_to_string() + " " +
self.get_privileges().save_to_string())
return
##
# 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, *args, **kwargs):
print self.dump_string(*args, **kwargs)
def dump_string(self, dump_parents=False):
result = ""
result += "CREDENTIAL %s\n" % self.get_subject()
result += " privs: %s\n" % self.get_privileges().save_to_string()
gidCaller = self.get_gid_caller()
if gidCaller:
result += " gidCaller:\n"
gidCaller.dump(8, dump_parents)
gidObject = self.get_gid_object()
if gidObject:
result += " gidObject:\n"
result += gidObject.dump_string(8, dump_parents)
result += " delegate: %s" % self.get_delegate()
if self.parent and dump_parents:
result += "PARENT\n"
result += self.parent.dump_string(dump_parents)
return result
def set_privileges(self, privs):
if isinstance(privs, str):
self.privileges = Rights(string=privs)
else:
self.privileges = privs
class Credential(object):
##
# Create a Credential object
#
# @param create If true, create a blank x509 certificate
# @param subject If subject!=None, create an x509 cert with the subject name
# @param string If string!=None, load the credential from the string
# @param filename If filename!=None, load the credential from the file
# FIXME: create and subject are ignored!
def __init__(self,
create=False,
subject=None,
string=None,
filename=None,
cred=None):
self.gidCaller = None
self.gidObject = None
self.expiration = None
self.privileges = None
self.issuer_privkey = None
self.issuer_gid = None
self.issuer_pubkey = None
self.parent = None
self.signature = None
self.xml = None
self.refid = None
self.legacy = None
self.type = None
self.version = None
if cred:
if isinstance(cred, StringTypes):
string = cred
self.type = 'geni_sfa'
self.version = '1.0'
elif isinstance(cred, dict):
string = cred['geni_value']
self.type = cred['geni_type']
self.version = cred['geni_version']
# Check if this is a legacy credential, translate it if so
if string or filename:
if string:
str = string
elif filename:
str = file(filename).read()
if str.strip().startswith("-----"):
self.legacy = CredentialLegacy(False, string=str)
self.translate_legacy(str)
else:
self.xml = str
self.decode()
# Find an xmlsec1 path
self.xmlsec_path = ''
paths = [
'/usr/bin', '/usr/local/bin', '/bin', '/opt/bin', '/opt/local/bin'
]
for path in paths:
if os.path.isfile(path + '/' + 'xmlsec1'):
self.xmlsec_path = path + '/' + 'xmlsec1'
break
def get_subject(self):
subject = ""
if not self.gidObject:
self.decode()
if self.gidObject:
subject = self.gidObject.get_printable_subject()
return subject
# sounds like this should be __repr__ instead ??
def get_summary_tostring(self):
if not self.gidObject:
self.decode()
obj = self.gidObject.get_printable_subject()
caller = self.gidCaller.get_printable_subject()
exp = self.get_expiration()
# Summarize the rights too? The issuer?
return "[ Grant %s rights on %s until %s ]" % (caller, obj, exp)
def get_signature(self):
if not self.signature:
self.decode()
return self.signature
def set_signature(self, sig):
self.signature = sig
##
# Translate a legacy credential into a new one
#
# @param String of the legacy credential
def translate_legacy(self, str):
legacy = CredentialLegacy(False, string=str)
self.gidCaller = legacy.get_gid_caller()
self.gidObject = legacy.get_gid_object()
lifetime = legacy.get_lifetime()
if not lifetime:
self.set_expiration(datetime.datetime.utcnow() +
datetime.timedelta(
seconds=DEFAULT_CREDENTIAL_LIFETIME))
else:
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())
##
# Need the issuer's private key and name
# @param key Keypair object containing the private key of the issuer
# @param gid GID of the issuing authority
def set_issuer_keys(self, privkey, gid):
self.issuer_privkey = privkey
self.issuer_gid = gid
##
# Set this credential's parent
def set_parent(self, cred):
self.parent = cred
self.updateRefID()
##
# set the GID of the caller
#
# @param gid GID object of the caller
def set_gid_caller(self, gid):
self.gidCaller = gid
# gid origin caller is the caller's gid by default
self.gidOriginCaller = gid
##
# get the GID of the object
def get_gid_caller(self):
if not self.gidCaller:
self.decode()
return self.gidCaller
##
# set the GID of the object
#
# @param gid GID object of the object
def set_gid_object(self, gid):
self.gidObject = gid
##
# get the GID of the object
def get_gid_object(self):
if not self.gidObject:
self.decode()
return self.gidObject
##
# Expiration: an absolute UTC time of expiration (as either an int or string or datetime)
#
def set_expiration(self, expiration):
if isinstance(expiration, (int, float)):
self.expiration = datetime.datetime.fromtimestamp(expiration)
elif isinstance(expiration, datetime.datetime):
self.expiration = expiration
elif isinstance(expiration, StringTypes):
self.expiration = utcparse(expiration)
else:
logger.error("unexpected input type in Credential.set_expiration")
##
# get the lifetime of the credential (always in datetime format)
def get_expiration(self):
if not self.expiration:
self.decode()
# at this point self.expiration is normalized as a datetime - DON'T call utcparse again
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 Rights object
def set_privileges(self, privs):
if isinstance(privs, str):
self.privileges = Rights(string=privs)
else:
self.privileges = privs
##
# return the privileges as a Rights object
def get_privileges(self):
if not self.privileges:
self.decode()
return self.privileges
##
# determine whether the credential allows a particular operation to be
# performed
#
# @param op_name string specifying name of operation ("lookup", "update", etc)
def can_perform(self, op_name):
rights = self.get_privileges()
if not rights:
return False
return rights.can_perform(op_name)
##
# Encode the attributes of the credential into an XML string
# This should be done immediately before signing the credential.
# WARNING:
# In general, a signed credential obtained externally should
# 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 encode(self):
# Create the XML document
doc = Document()
signed_cred = doc.createElement("signed-credential")
# Declare namespaces
# Note that credential/policy.xsd are really the PG schemas
# in a PL namespace.
# Note that delegation of credentials between the 2 only really works
# cause those schemas are identical.
# Also note these PG schemas talk about PG tickets and CM policies.
signed_cred.setAttribute("xmlns:xsi",
"http://www.w3.org/2001/XMLSchema-instance")
signed_cred.setAttribute(
"xsi:noNamespaceSchemaLocation",
"http://www.planet-lab.org/resources/sfa/credential.xsd")
signed_cred.setAttribute(
"xsi:schemaLocation",
"http://www.planet-lab.org/resources/sfa/ext/policy/1 http://www.planet-lab.org/resources/sfa/ext/policy/1/policy.xsd"
)
# PG says for those last 2:
# signed_cred.setAttribute("xsi:noNamespaceSchemaLocation", "http://www.protogeni.net/resources/credential/credential.xsd")
# signed_cred.setAttribute("xsi:schemaLocation", "http://www.protogeni.net/resources/credential/ext/policy/1 http://www.protogeni.net/resources/credential/ext/policy/1/policy.xsd")
doc.appendChild(signed_cred)
# Fill in the <credential> bit
cred = doc.createElement("credential")
cred.setAttribute("xml:id", self.get_refid())
signed_cred.appendChild(cred)
append_sub(doc, cred, "type", "privilege")
append_sub(doc, cred, "serial", "8")
append_sub(doc, cred, "owner_gid", self.gidCaller.save_to_string())
append_sub(doc, cred, "owner_urn", self.gidCaller.get_urn())
append_sub(doc, cred, "target_gid", self.gidObject.save_to_string())
append_sub(doc, cred, "target_urn", self.gidObject.get_urn())
append_sub(doc, cred, "uuid", "")
if not self.expiration:
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")
cred.appendChild(privileges)
if self.privileges:
rights = self.get_privileges()
for right in rights.rights:
priv = doc.createElement("privilege")
append_sub(doc, priv, "name", right.kind)
append_sub(doc, priv, "can_delegate",
str(right.delegate).lower())
privileges.appendChild(priv)
# Add the parent credential if it exists
if self.parent:
sdoc = parseString(self.parent.get_xml())
# If the root node is a signed-credential (it should be), then
# get all its attributes and attach those to our signed_cred
# node.
# Specifically, PG and PLadd attributes for namespaces (which is reasonable),
# and we need to include those again here or else their signature
# no longer matches on the credential.
# We expect three of these, but here we copy them all:
# signed_cred.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance")
# and from PG (PL is equivalent, as shown above):
# signed_cred.setAttribute("xsi:noNamespaceSchemaLocation", "http://www.protogeni.net/resources/credential/credential.xsd")
# signed_cred.setAttribute("xsi:schemaLocation", "http://www.protogeni.net/resources/credential/ext/policy/1 http://www.protogeni.net/resources/credential/ext/policy/1/policy.xsd")
# HOWEVER!
# PL now also declares these, with different URLs, so
# the code notices those attributes already existed with
# different values, and complains.
# This happens regularly on delegation now that PG and
# PL both declare the namespace with different URLs.
# If the content ever differs this is a problem,
# but for now it works - different URLs (values in the attributes)
# but the same actual schema, so using the PG schema
# on delegated-to-PL credentials works fine.
# Note: you could also not copy attributes
# which already exist. It appears that both PG and PL
# will actually validate a slicecred with a parent
# signed using PG namespaces and a child signed with PL
# namespaces over the whole thing. But I don't know
# if that is a bug in xmlsec1, an accident since
# the contents of the schemas are the same,
# or something else, but it seems odd. And this works.
parentRoot = sdoc.documentElement
if parentRoot.tagName == "signed-credential" and parentRoot.hasAttributes(
):
for attrIx in range(0, parentRoot.attributes.length):
attr = parentRoot.attributes.item(attrIx)
# returns the old attribute of same name that was
# on the credential
# Below throws InUse exception if we forgot to clone the attribute first
oldAttr = signed_cred.setAttributeNode(
attr.cloneNode(True))
if oldAttr and oldAttr.value != attr.value:
msg = "Delegating cred from owner %s to %s over %s:\n - Replaced attribute %s value '%s' with '%s'" % (
self.parent.gidCaller.get_urn(),
self.gidCaller.get_urn(), self.gidObject.get_urn(),
oldAttr.name, oldAttr.value, attr.value)
logger.warn(msg)
#raise CredentialNotVerifiable("Can't encode new valid delegated credential: %s" % msg)
p_cred = doc.importNode(
sdoc.getElementsByTagName("credential")[0], True)
p = doc.createElement("parent")
p.appendChild(p_cred)
cred.appendChild(p)
# done handling parent credential
# Create the <signatures> tag
signatures = doc.createElement("signatures")
signed_cred.appendChild(signatures)
# Add any parent signatures
if self.parent:
for cur_cred in self.get_credential_list()[1:]:
sdoc = parseString(cur_cred.get_signature().get_xml())
ele = doc.importNode(
sdoc.getElementsByTagName("Signature")[0], True)
signatures.appendChild(ele)
# Get the finished product
self.xml = doc.toxml()
def save_to_random_tmp_file(self):
fp, filename = mkstemp(suffix='cred', text=True)
fp = os.fdopen(fp, "w")
self.save_to_file(filename, save_parents=True, filep=fp)
return filename
def save_to_file(self, filename, save_parents=True, filep=None):
if not self.xml:
self.encode()
if filep:
f = filep
else:
f = open(filename, "w")
f.write(self.xml)
f.close()
def save_to_string(self, save_parents=True):
if not self.xml:
self.encode()
return self.xml
def get_refid(self):
if not self.refid:
self.refid = 'ref0'
return self.refid
def set_refid(self, rid):
self.refid = rid
##
# Figure out what refids exist, and update this credential's id
# so that it doesn't clobber the others. Returns the refids of
# the parents.
def updateRefID(self):
if not self.parent:
self.set_refid('ref0')
return []
refs = []
next_cred = self.parent
while next_cred:
refs.append(next_cred.get_refid())
if next_cred.parent:
next_cred = next_cred.parent
else:
next_cred = None
# Find a unique refid for this credential
rid = self.get_refid()
while rid in refs:
val = int(rid[3:])
rid = "ref%d" % (val + 1)
# Set the new refid
self.set_refid(rid)
# Return the set of parent credential ref ids
return refs
def get_xml(self):
if not self.xml:
self.encode()
return self.xml
##
# Sign the XML file created by encode()
#
# WARNING:
# In general, a signed credential obtained externally should
# 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 sign(self):
if not self.issuer_privkey or not self.issuer_gid:
return
doc = parseString(self.get_xml())
sigs = doc.getElementsByTagName("signatures")[0]
# Create the signature template to be signed
signature = Signature()
signature.set_refid(self.get_refid())
sdoc = parseString(signature.get_xml())
sig_ele = doc.importNode(
sdoc.getElementsByTagName("Signature")[0], True)
sigs.appendChild(sig_ele)
self.xml = doc.toxml()
# Split the issuer GID into multiple certificates if it's a chain
chain = GID(filename=self.issuer_gid)
gid_files = []
while chain:
gid_files.append(chain.save_to_random_tmp_file(False))
if chain.get_parent():
chain = chain.get_parent()
else:
chain = None
# Call out to xmlsec1 to sign it
ref = 'Sig_%s' % self.get_refid()
filename = self.save_to_random_tmp_file()
signed = os.popen('%s --sign --node-id "%s" --privkey-pem %s,%s %s' \
% (self.xmlsec_path, ref, self.issuer_privkey, ",".join(gid_files), filename)).read()
os.remove(filename)
for gid_file in gid_files:
os.remove(gid_file)
self.xml = signed
# This is no longer a legacy credential
if self.legacy:
self.legacy = None
# Update signatures
self.decode()
##
# Retrieve the attributes of the credential from the XML.
# This is automatically called by the various get_* methods of
# this class and should not need to be called explicitly.
def decode(self):
if not self.xml:
return
doc = None
try:
doc = parseString(self.xml)
except ExpatError, e:
raise CredentialNotVerifiable("Malformed credential")
doc = parseString(self.xml)
sigs = []
signed_cred = doc.getElementsByTagName("signed-credential")
# Is this a signed-cred or just a cred?
if len(signed_cred) > 0:
creds = signed_cred[0].getElementsByTagName("credential")
signatures = signed_cred[0].getElementsByTagName("signatures")
if len(signatures) > 0:
sigs = signatures[0].getElementsByTagName("Signature")
else:
creds = doc.getElementsByTagName("credential")
if creds is None or len(creds) == 0:
# malformed cred file
raise CredentialNotVerifiable(
"Malformed XML: No credential tag found")
# Just take the first cred if there are more than one
cred = creds[0]
self.set_refid(cred.getAttribute("xml:id"))
self.set_expiration(utcparse(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 = Rights()
for priv in privs.getElementsByTagName("privilege"):
kind = getTextNode(priv, "name")
deleg = str2bool(getTextNode(priv, "can_delegate"))
if kind == '*':
# Convert * into the default privileges for the credential's type
# Each inherits the delegatability from the * above
_, type = urn_to_hrn(self.gidObject.get_urn())
rl = determine_rights(type, self.gidObject.get_urn())
for r in rl.rights:
r.delegate = deleg
rlist.add(r)
else:
rlist.add(Right(kind.strip(), deleg))
self.set_privileges(rlist)
# Is there a parent?
parent = cred.getElementsByTagName("parent")
if len(parent) > 0:
parent_doc = parent[0].getElementsByTagName("credential")[0]
parent_xml = parent_doc.toxml()
self.parent = Credential(string=parent_xml)
self.updateRefID()
# Assign the signatures to the credentials
for sig in sigs:
Sig = Signature(string=sig.toxml())
for cur_cred in self.get_credential_list():
if cur_cred.get_refid() == Sig.get_refid():
cur_cred.set_signature(Sig)
def decode(self):
if not self.xml:
return
doc = parseString(self.xml)
sigs = []
signed_cred = doc.getElementsByTagName("signed-credential")
# Is this a signed-cred or just a cred?
if len(signed_cred) > 0:
creds = signed_cred[0].getElementsByTagName("credential")
signatures = signed_cred[0].getElementsByTagName("signatures")
if len(signatures) > 0:
sigs = signatures[0].getElementsByTagName("Signature")
else:
creds = doc.getElementsByTagName("credential")
if creds is None or len(creds) == 0:
# malformed cred file
raise CredentialNotVerifiable(
"Malformed XML: No credential tag found")
# Just take the first cred if there are more than one
cred = creds[0]
self.set_refid(cred.getAttribute("xml:id"))
self.set_expiration(utcparse(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 = Rights()
for priv in privs.getElementsByTagName("privilege"):
kind = getTextNode(priv, "name")
deleg = str2bool(getTextNode(priv, "can_delegate"))
if kind == '*':
# Convert * into the default privileges for the credential's type
# Each inherits the delegatability from the * above
_, type = urn_to_hrn(self.gidObject.get_urn())
rl = determine_rights(type, self.gidObject.get_urn())
for r in rl.rights:
r.delegate = deleg
rlist.add(r)
else:
rlist.add(Right(kind.strip(), deleg))
self.set_privileges(rlist)
# Is there a parent?
parent = cred.getElementsByTagName("parent")
if len(parent) > 0:
parent_doc = parent[0].getElementsByTagName("credential")[0]
parent_xml = parent_doc.toxml()
self.parent = Credential(string=parent_xml)
self.updateRefID()
# Assign the signatures to the credentials
for sig in sigs:
Sig = Signature(string=sig.toxml())
for cur_cred in self.get_credential_list():
if cur_cred.get_refid() == Sig.get_refid():
cur_cred.set_signature(Sig)
class CredentialLegacy(Certificate):
gidCaller = None
gidObject = None
lifeTime = None
privileges = None
delegate = False
##
# Create a Credential object
#
# @param create If true, create a blank x509 certificate
# @param subject If subject!=None, create an x509 cert with the subject name
# @param string If string!=None, load the credential from the string
# @param filename If filename!=None, load the credential from the file
def __init__(self, create=False, subject=None, string=None, filename=None):
Certificate.__init__(self, create, subject, string, filename)
##
# set the GID of the caller
#
# @param gid GID object of the caller
def set_gid_caller(self, gid):
self.gidCaller = gid
# gid origin caller is the caller's gid by default
self.gidOriginCaller = gid
##
# get the GID of the object
def get_gid_caller(self):
if not self.gidCaller:
self.decode()
return self.gidCaller
##
# set the GID of the object
#
# @param gid GID object of the object
def set_gid_object(self, gid):
self.gidObject = gid
##
# get the GID of the object
def get_gid_object(self):
if not self.gidObject:
self.decode()
return self.gidObject
##
# set the lifetime of this credential
#
# @param lifetime lifetime of credential
def set_lifetime(self, lifeTime):
self.lifeTime = lifeTime
##
# get the lifetime of the credential
def get_lifetime(self):
if not self.lifeTime:
self.decode()
return self.lifeTime
##
# set the delegate bit
#
# @param delegate boolean (True or False)
def set_delegate(self, delegate):
self.delegate = delegate
##
# get the delegate bit
def get_delegate(self):
if not self.delegate:
self.decode()
return self.delegate
##
# set the privileges
#
# @param privs either a comma-separated list of privileges of a Rights object
def set_privileges(self, privs):
if isinstance(privs, str):
self.privileges = Rights(string=privs)
else:
self.privileges = privs
##
# return the privileges as a Rights object
def get_privileges(self):
if not self.privileges:
self.decode()
return self.privileges
##
# determine whether the credential allows a particular operation to be
# performed
#
# @param op_name string specifying name of operation ("lookup", "update", etc)
def can_perform(self, op_name):
rights = self.get_privileges()
if not rights:
return False
return rights.can_perform(op_name)
##
# Encode the attributes of the credential into a string and store that
# string in the alt-subject-name field of the X509 object. This should be
# done immediately before signing the credential.
def encode(self):
dict = {
"gidCaller": None,
"gidObject": None,
"lifeTime": self.lifeTime,
"privileges": None,
"delegate": self.delegate,
}
if self.gidCaller:
dict["gidCaller"] = self.gidCaller.save_to_string(save_parents=True)
if self.gidObject:
dict["gidObject"] = self.gidObject.save_to_string(save_parents=True)
if self.privileges:
dict["privileges"] = self.privileges.save_to_string()
str = xmlrpclib.dumps((dict,), allow_none=True)
self.set_data("URI:http://" + str)
##
# Retrieve the attributes of the credential from the alt-subject-name field
# of the X509 certificate. This is automatically done by the various
# get_* methods of this class and should not need to be called explicitly.
def decode(self):
data = self.get_data().lstrip("URI:http://")
if data:
dict = xmlrpclib.loads(data)[0][0]
else:
dict = {}
self.lifeTime = dict.get("lifeTime", None)
self.delegate = dict.get("delegate", None)
privStr = dict.get("privileges", None)
if privStr:
self.privileges = Rights(string=privStr)
else:
self.privileges = None
gidCallerStr = dict.get("gidCaller", None)
if gidCallerStr:
self.gidCaller = GID(string=gidCallerStr)
else:
self.gidCaller = None
gidObjectStr = dict.get("gidObject", None)
if gidObjectStr:
self.gidObject = GID(string=gidObjectStr)
else:
self.gidObject = None
##
# Verify that a chain of credentials is valid (see cert.py:verify). In
# addition to the checks for ordinary certificates, verification also
# ensures that the delegate bit was set by each parent in the chain. If
# a delegate bit was not set, then an exception is thrown.
#
# Each credential must be a subset of the rights of the parent.
def verify_chain(self, trusted_certs=None):
# do the normal certificate verification stuff
Certificate.verify_chain(self, trusted_certs)
if self.parent:
# make sure the parent delegated rights to the child
if not self.parent.get_delegate():
raise MissingDelegateBit(self.parent.get_subject())
# make sure the rights given to the child are a subset of the
# parents rights
if not self.parent.get_privileges().is_superset(self.get_privileges()):
raise ChildRightsNotSubsetOfParent(
self.get_subject()
+ " "
+ self.parent.get_privileges().save_to_string()
+ " "
+ self.get_privileges().save_to_string()
)
return
##
# 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, *args, **kwargs):
print self.dump_string(*args, **kwargs)
def dump_string(self, dump_parents=False):
result = ""
result += "CREDENTIAL %s\n" % self.get_subject()
result += " privs: %s\n" % self.get_privileges().save_to_string()
gidCaller = self.get_gid_caller()
if gidCaller:
result += " gidCaller:\n"
gidCaller.dump(8, dump_parents)
gidObject = self.get_gid_object()
if gidObject:
result += " gidObject:\n"
result += gidObject.dump_string(8, dump_parents)
result += " delegate: %s" % self.get_delegate()
if self.parent and dump_parents:
result += "PARENT\n"
result += self.parent.dump_string(dump_parents)
return result
def set_privileges(self, privs):
if isinstance(privs, str):
self.privileges = Rights(string=privs)
else:
self.privileges = privs
