def request_negotiate(asa_handle, obj, peer, timeout):
"""
##############################################################
# request_negotiate(asa_handle, obj, peer, timeout)
#
# Request negotiation session with a peer ASA.
#
# asa_handle identifies the calling ASA
#
# obj is a GRASP objective including the requested value
#
# The objective's loop_count value should be set to a suitable
# value by the ASA. If not, the GRASP default will apply.
#
# peer is the target node, an asa_locator as returned by discover()
# If peer is None, discovery is performed first.
#
# timeout in milliseconds (None for default)
#
# Launch in a new thread if asynchronous operation required.
#
# Four possible return conditions are possible:
#
# 1) return zero, None, objective, None
#
# The peer has agreed; the returned objective contains the agreed value.
#
# 2) return zero, session_handle, objective, None
#
# Negotiation continues.
#
# The returned objective contains the first value offered by the
# negotiation peer. This instance of the objective MUST be used in
# subsequent negotiation steps because it contains the loop count.
#
# The ASA MUST store the session_handle (an opaque Python object)
# and use it in the subsequent negotiation steps.
#
# 3) return errors.declined, None, None, string
#
# The peer declined further negotiation, the string gives a reason
# if provided by the peer.
#
# 4) For any non-zero errorcode except errors.declined:
# return errorcode, None, None, None
#
# The negotiation failed, errorcode gives reason,
# exponential backoff RECOMMENDED before retry.
##############################################################
"""
e, s, r = grasp.req_negotiate(asa_handle, obj, peer, timeout)
if e == errors.ok:
return e, s, r, None
if e == errors.declined:
return e, None, None, r
return e, None, None, None
#discover a peer
if failct > 3:
failct = 0
grasp.tprint("Flushing EX3 discovery")
_, ll = grasp.discover(asa_handle, obj3, 1000, flush = True)
else:
_, ll = grasp.discover(asa_handle, obj3, 1000)
if ll==[]:
grasp.tprint("Discovery failed")
failct += 1
continue
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
grasp.tprint("Session starting")
err, shandle, answer = grasp.req_negotiate(asa_handle, obj3, ll[0], None, noloop=True)
if err == grasp.errors.noReply:
#session is available
err = False
while not err:
tweet = input("Your message:")
err = grasp.gsend(asa_handle, shandle, tweet)
if not err:
err, reply = grasp.grecv(asa_handle, shandle, 60000)
if not err:
grasp.tprint("Peer replied:", reply)
grasp.tprint("Send/recv error:",grasp.etext[err])
#all errors are fatal, the session is dead
grasp.tprint("End of session")
continue
def get_dns_info(dom):
"""Obtain and return all DNS-SD records for a domain"""
global obj3
global failct
#start of a negotiating session
obj3.value = dom
obj3.loop_count = 10 #allows for some fragmentation
# As a random test, use CBOR (Tag 24) format for value (should work)
if not grasp._prng.randint(0, 3):
_cbor = True
else:
_cbor = False
# As a random test, request dry run (should fail)
if not grasp._prng.randint(0, 7):
obj3.dry = True # random error for testing purposes
else:
obj3.dry = False
grasp.tprint("Asking for", obj3.value, "; dry run", obj3.dry, "; Tag 24",
_cbor)
#discover a peer
if failct > 3:
failct = 0
grasp.tprint("Flushing", obj3.name, "discovery")
_, ll = grasp.discover(asa_nonce, obj3, 1000, flush=True)
else:
_, ll = grasp.discover(asa_nonce, obj3, 1000)
if ll == []:
grasp.tprint("Discovery failed")
failct += 1
return
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
if _cbor:
#CBORise the value
obj3.value = cbor.dumps(obj3.value)
reply = []
err, snonce, answer = grasp.req_negotiate(asa_nonce, obj3, ll[0], None)
if err:
if err == grasp.errors.declined and answer != "":
_e = answer
else:
_e = grasp.etext[err]
grasp.tprint("req_negotiate error:", _e)
failct += 1
grasp.tprint("Fail count", failct)
time.sleep(5) #to calm things if there's a looping error
elif (not err) and snonce:
grasp.ttprint("requested, session_nonce:", snonce, "answer", answer)
_found_cbor = False
if _cbor:
answer.value, _found_cbor = detag(answer.value)
grasp.ttprint("Received reply", answer.value)
if _cbor != _found_cbor:
#Anomaly, get me out of here
grasp.tprint("CBOR anomaly 1 - missing segment?")
grasp.end_negotiate(asa_nonce,
snonce,
False,
reason="CBOR anomaly 1 - missing segment?")
elif not grasp._prng.randint(0, 7):
#######################################################
# As a random test of robustness, send a bogus response
answer.value = "rubbish"
grasp.tprint("Sending rubbish")
if _cbor:
#CBORise the value
answer.value = cbor.dumps(answer.value)
err, temp, answer = grasp.negotiate_step(asa_nonce, snonce, answer,
1000)
grasp.ttprint("Reply to rubbish:", err, temp, answer)
_found_cbor = False
if _cbor and (not err):
answer.value, _found_cbor = detag(answer.value)
if (not err) and temp == None:
grasp.tprint("Unexpected answer:", answer.value)
elif (not err) and _cbor != _found_cbor:
grasp.tprint("CBOR anomaly 2 - missing segment?")
elif not err:
grasp.tprint("Loop count", answer.loop_count,
"unexpected answer", answer.value)
err = grasp.end_negotiate(asa_nonce,
snonce,
False,
reason="Unexpected answer")
if err:
grasp.tprint("end_negotiate error:", grasp.etext[err])
else:
#other end rejected
if err == grasp.errors.declined and answer != "":
_e = answer
else:
_e = grasp.etext[err]
grasp.tprint("Peer reject:", _e)
# End of random test of robustness
#######################################################
else:
#Received answer
looping = True
while looping:
grasp.ttprint("Answer is", answer.value)
if 'MORE' in answer.value:
#need to go again
reply += answer.value[:answer.value.index('MORE')]
answer.value = "ACK"
grasp.tprint("Sending ACK for more")
if _cbor:
#CBORise the value
answer.value = cbor.dumps(answer.value)
err, temp, answer = grasp.negotiate_step(
asa_nonce, snonce, answer, 1000)
if err:
grasp.tprint("negotiate_step error:", grasp.etext[err])
looping = False
elif _cbor:
answer.value, _found_cbor = detag(answer.value)
if _cbor != _found_cbor:
#anomaly, get me out of here
looping = False
grasp.end_negotiate(
asa_nonce,
snonce,
False,
reason="CBOR anomaly - missing segment?")
grasp.tprint("CBOR anomaly 3 - missing segment?")
grasp.ttprint("Reply to ACK:", err, temp, answer)
else:
looping = False
reply += answer.value
err = grasp.end_negotiate(asa_nonce, snonce, True)
if not err:
if len(reply):
grasp.tprint("Query succeeded", reply)
else:
grasp.tprint("Empty result")
else:
grasp.tprint("end_negotiate error:", grasp.etext[err])
else:
#immediate end, strange
grasp.tprint("Unexpected reply", answer.value)
#end of a negotiating session
time.sleep(5) #to keep things calm...
return
#good one is still available
peer = good_peer
grasp.tprint("Trying previous peer")
else:
## #cycle through peers
## if next_peer < len(ll):
## peer = ll[next_peer]
## next_peer += 1
## else:
## peer = ll[0]
## next_peer = 1
#pick peer at random
next_peer = grasp._prng.randint(0, len(ll) - 1)
peer = ll[next_peer]
grasp.tprint("Trying peer", next_peer, "out of", len(ll))
err, snonce, answer = grasp.req_negotiate(asa_nonce, want_obj,
peer, 3000)
if not err:
if snonce:
#we got an offer
if answer.value[lgth] < want_p + 1:
#acceptable
grasp.end_negotiate(asa_nonce, snonce, True)
insert_pool(answer.value[lgth], answer.value[pfx])
need = 0
good_peer = peer #cache this one
grasp.tprint(
"Obtained",
prefstr(answer.value[lgth], answer.value[pfx]))
else:
#unacceptable
grasp.end_negotiate(asa_nonce, snonce, False,
failct = 0
grasp.tprint("Flushing EX3 discovery")
_, ll = grasp.discover(asa_nonce, obj3, 1000, flush=True)
else:
_, ll = grasp.discover(asa_nonce, obj3, 1000)
if ll == []:
grasp.tprint("Discovery failed")
failct += 1
continue
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
grasp.tprint("Session starting")
err, snonce, answer = grasp.req_negotiate(asa_nonce,
obj3,
ll[0],
None,
noloop=True)
if err == grasp.errors.noReply:
#session is available
err = False
while not err:
tweet = input("Your message:")
err = grasp.gsend(asa_nonce, snonce, tweet)
if not err:
err, reply = grasp.grecv(asa_nonce, snonce, 60000)
if not err:
grasp.tprint("Peer replied:", reply)
grasp.tprint("Send/recv error:", grasp.etext[err])
#all errors are fatal, the session is dead
def run(self):
global cheat_nonce
iwant = grasp._prng.randint(10, 500)
grasp.tprint("Asking for $", iwant)
err, asa_nonce2 = grasp.register_asa("Neg2") #assume it worked
obj = grasp.objective("EX2")
obj.neg = True
#obj.loop_count = 2 #for testing purposes
while cheat_nonce == None:
time.sleep(
1) #we should exit after neg1 has registered the objective
asa_nonce = cheat_nonce #now we can pretend to own the objective
grasp.tprint("Got nonce", asa_nonce)
err, ll = grasp.discover(asa_nonce, obj, 5000)
if ll == []:
grasp.tprint("Discovery failed: exit")
return
grasp.tprint("Discovered locator", ll[0].locator)
#attempt to negotiate
obj.value = ["NZD", iwant]
if not iwant % 7:
obj.value = ["USD", iwant] # for testing purposes
err, snonce, answer = grasp.req_negotiate(asa_nonce, obj, ll[0], None)
if err:
if err == grasp.errors.declined and answer != "":
_t = answer
else:
_t = grasp.etext[err]
grasp.tprint("req_negotiate error:", _t)
elif (not err) and snonce:
grasp.tprint("requested, session_nonce:", snonce, "answer", answer)
if answer.value[1] < 0.75 * iwant:
answer.value[1] = int(0.75 * iwant)
err, temp, answer2 = grasp.negotiate_step(
asa_nonce, snonce, answer, 1000)
grasp.tprint("Step1 gave:", err, temp, answer2)
if (not err) and (not temp):
grasp.tprint("Negotiation succeeded", answer.value)
elif not err:
#not acceptable, try one more time
answer2.value[1] = int(0.6 * iwant)
#at random, throw an invalid format of message
if not iwant % 3:
grasp.tprint("Trying badmess")
grasp._make_badmess = True
err, temp, answer3 = grasp.negotiate_step(
asa_nonce, snonce, answer2, 1000)
grasp.tprint("Step2 gave:", err, temp, answer3)
if (not err) and (not temp):
grasp.tprint("Negotiation succeeded", answer3.value)
elif (not err):
#not acceptable
err = grasp.end_negotiate(asa_nonce,
snonce,
False,
reason="You are mean!")
if err:
grasp.tprint("end_negotiate error:",
grasp.etext[err])
else:
#other end rejected
grasp.tprint("Peer reject:", answer3)
else:
#other end rejected
grasp.tprint("Peer reject:", answer2)
else: #acceptable answer
err = grasp.end_negotiate(asa_nonce, snonce, True)
if not err:
grasp.tprint("Negotiation succeeded", answer.value)
else:
grasp.tprint("end_negotiate error:", grasp.etext[err])
else: #acceptable answer first time
grasp.tprint("Negotiation succeeded", answer.value)
grasp.tprint("Exit")
def get_dns_info(service, dom):
"""Obtain and return all DNS-SD records for a service and domain"""
global obj3
global failct
#start of a negotiating session
obj3.loop_count = 20 #allows for some fragmentation
obj3.dry = False #dry run not allowed
req_elem = new_relement()
req_elem[cp.outer][cp.sender_loop_count] = obj3.loop_count
req_elem[cp.outer][cp.srv_element][cp.service] = service
req_elem[cp.outer][cp.srv_element][cp.domain] = dom
obj3.value = req_elem
# As a random test, use CBOR (Tag 24) format for value (should work)
if not grasp._prng.randint(0, 3):
_cbor = True
else:
_cbor = False
grasp.tprint("Asking for", obj3.value, "; Tag 24", _cbor)
#discover a peer
if failct > 3:
failct = 0
grasp.tprint("Flushing", obj3.name, "discovery")
_, ll = grasp.discover(asa_nonce, obj3, 1000, flush=True)
else:
_, ll = grasp.discover(asa_nonce, obj3, 1000)
if ll == []:
grasp.tprint("Discovery failed")
failct += 1
return
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
if _cbor:
#CBORise the value
obj3.value = cbor.dumps(obj3.value)
reply = []
err, snonce, answer = grasp.req_negotiate(asa_nonce, obj3, ll[0], None)
if err:
if err == grasp.errors.declined and answer != "":
_e = answer
else:
_e = grasp.etext[err]
grasp.tprint("req_negotiate error:", _e)
failct += 1
grasp.tprint("Fail count", failct)
time.sleep(5) #to calm things if there's a looping error
elif (not err) and snonce:
grasp.ttprint("requested, session_nonce:", snonce, "answer", answer)
_found_cbor = False
if _cbor:
answer.value, _found_cbor = detag(answer.value)
grasp.tprint("First reply:", prettify(answer.value))
if _cbor != _found_cbor:
#Anomaly, get me out of here
grasp.tprint("CBOR anomaly 1 - missing segment?")
grasp.end_negotiate(asa_nonce,
snonce,
False,
reason="CBOR anomaly 1 - missing segment?")
else:
#Received first answer
looping = True
while looping:
#need to go again
answer.value = "ACK"
grasp.tprint("Sending ACK for more")
answer.loop_count += 2 #allow an extra round trip
if _cbor:
#CBORise the value
answer.value = cbor.dumps(answer.value)
err, temp, answer = grasp.negotiate_step(
asa_nonce, snonce, answer, 5000)
if err:
grasp.tprint("negotiate_step error:", grasp.etext[err])
looping = False
elif not temp:
#end of replies
looping = False
else:
if _cbor:
answer.value, _found_cbor = detag(answer.value)
if _cbor != _found_cbor:
#anomaly, get me out of here
looping = False
grasp.end_negotiate(
asa_nonce,
snonce,
False,
reason="CBOR anomaly 2 - missing segment?")
grasp.tprint("CBOR anomaly 2 - missing segment?")
return
grasp.tprint("Next reply:", prettify(answer.value))
grasp.tprint("End of replies")
else:
#immediate end, strange
grasp.tprint("Unexpected reply", answer.value)
#end of a negotiating session
time.sleep(5) #to keep things calm...
return
def get_file(fn):
"""Get a single file"""
global requested_obj
global failct
global directory
#start of a negotiating session
requested_obj.value = fn
requested_obj.loop_count = 10 #allows for some fragmentation
#prepare file path for result
try:
#strip C:/brian/docs for xfer from Windows to Linux
_, fpath = fn.split("C:/brian/docs/")
except:
fpath = directory + fn
grasp.tprint("Asking for", requested_obj.value)
#discover a peer
if failct > 3:
failct = 0
grasp.tprint("Flushing", requested_obj.name, "discovery")
_, ll = grasp.discover(asa_nonce, requested_obj, 1000, flush=True)
else:
_, ll = grasp.discover(asa_nonce, requested_obj, 1000)
if ll == []:
grasp.tprint("Discovery failed")
failct += 1
return
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
reply = b''
err, snonce, received_obj = grasp.req_negotiate(asa_nonce, requested_obj,
ll[0], 5000)
if err:
if err == grasp.errors.declined and received_obj != "":
_e = received_obj
else:
_e = grasp.etext[err]
grasp.tprint("req_negotiate error:", _e)
failct += 1
grasp.tprint("Fail count", failct)
elif (not err) and snonce:
grasp.ttprint("requested, session_nonce:", snonce, "received_obj",
received_obj)
grasp.ttprint("Received reply", received_obj.value)
looping = True
first = True
while looping:
grasp.ttprint("received_obj is", received_obj.value)
if first and (received_obj.value == b''):
grasp.tprint("File not found")
looping = False
elif received_obj.value == b'':
#got the last block
looping = False
file.close()
err = grasp.end_negotiate(asa_nonce, snonce, True)
if not err:
grasp.tprint("Transfer succeeded")
else:
grasp.tprint("end_negotiate error:", grasp.etext[err])
elif len(received_obj.value):
if first:
file = open(fpath, "wb")
grasp.tprint("Starting transfer")
#write a block and go again
file.write(received_obj.value)
received_obj.value = "ACK"
received_obj.loop_count += 1
grasp.ttprint("Sending ACK for more")
err, temp, received_obj = grasp.negotiate_step(
asa_nonce, snonce, received_obj, 1000)
if err:
if err == grasp.errors.declined and received_obj != "":
_e = received_obj
else:
_e = grasp.etext[err]
grasp.tprint("negotiate_step error:", _e)
looping = False
grasp.ttprint("Reply to ACK:", err, temp, received_obj)
first = False
else:
#immediate end, strange
grasp.tprint("Unexpected reply", received_obj.value)
#end of a negotiating session
time.sleep(5) #to keep things calm...
return
def get_file():
"""Get key file"""
global keys_obj
global failct
global private_key
#look for quadski
err, results = grasp.get_flood(asa_nonce, flood_obj)
if not err:
# results contains all the unexpired tagged objectives
# but really there should only be one...
if results == []:
grasp.tprint("Found no value for",flood_obj.name)
time.sleep(10) #pause for something to change...
return
else:
grasp.tprint("Found value for",flood_obj.name)
# recover quadski's public key
quadski_pub_key = serialization.load_pem_public_key(
results[0].objective.value,
backend=default_backend() )
else:
grasp.tprint("get_flood failed", grasp.etext[err])
return #not this time
#set up objective value
ciphertext = quadski_pub_key.encrypt(
password,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
keys_obj.value = [ciphertext,pem]
#start of negotiating session
grasp.tprint("Asking for keys")
#discover a peer
if failct > 3:
failct = 0
grasp.tprint("Flushing", keys_obj.name, "discovery")
_, ll = grasp.discover(asa_nonce, keys_obj, 1000, flush = True)
else:
_, ll = grasp.discover(asa_nonce, keys_obj, 1000)
if ll==[]:
grasp.tprint("Discovery failed")
failct += 1
return
grasp.ttprint("Discovered locator", ll[0].locator)
#attempt to negotiate
err, snonce, received_obj = grasp.req_negotiate(asa_nonce, keys_obj, ll[0], 5000)
if err:
if err==grasp.errors.declined and received_obj!="":
_e = received_obj
else:
_e = grasp.etext[err]
grasp.tprint("Negotiation error:", _e)
failct += 1
grasp.tprint("Fail count", failct)
if _e == "Incorrect password":
get_pass()
return
elif (not err) and snonce:
grasp.ttprint("requested, session_nonce:",snonce,"received_obj",received_obj)
grasp.ttprint("Received raw reply",received_obj.value)
grasp.ttprint("received_obj is", received_obj.value)
if received_obj.value == b'':
grasp.tprint("Keys not found")
else:
grasp.ttprint("Starting transfer")
#decrypt block
plaintext = private_key.decrypt(
received_obj.value,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
keys = cbor.loads(plaintext)
key = keys[0]
iv = keys[1]
file = open(r"quadsk.py","w")
file.write("key="+str(key)+"\n")
file.write("iv="+str(iv)+"\n")
file.close()
grasp.tprint("quadsk.py saved OK")
err = grasp.end_negotiate(asa_nonce, snonce, True)
if err:
grasp.tprint("end_negotiate error:",grasp.etext[err])
else:
#immediate end, strange
grasp.tprint("Unexpected reply", received_obj.value)
#end of a negotiating session
time.sleep(10) #pause for something to change...
return
