kopia lustrzana https://github.com/markqvist/reticulum
320 wiersze
9.3 KiB
Python
320 wiersze
9.3 KiB
Python
import base64
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import math
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import os
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import RNS
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import time
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import atexit
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import vendor.umsgpack as umsgpack
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.serialization import load_der_public_key
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from cryptography.hazmat.primitives.serialization import load_der_private_key
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.hazmat.primitives.asymmetric import padding
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class Identity:
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#KEYSIZE = 1536
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KEYSIZE = 1024
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DERKEYSIZE = KEYSIZE+272
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# Non-configurable constants
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PADDINGSIZE = 336 # In bits
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HASHLENGTH = 256 # In bits
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SIGLENGTH = KEYSIZE
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# Storage
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known_destinations = {}
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@staticmethod
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def remember(packet_hash, destination_hash, public_key, app_data = None):
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RNS.log("Remembering "+RNS.prettyhexrep(destination_hash), RNS.LOG_VERBOSE)
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Identity.known_destinations[destination_hash] = [time.time(), packet_hash, public_key, app_data]
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@staticmethod
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def recall(destination_hash):
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RNS.log("Searching for "+RNS.prettyhexrep(destination_hash)+"...", RNS.LOG_DEBUG)
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if destination_hash in Identity.known_destinations:
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identity_data = Identity.known_destinations[destination_hash]
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identity = Identity(public_only=True)
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identity.loadPublicKey(identity_data[2])
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RNS.log("Found "+RNS.prettyhexrep(destination_hash)+" in known destinations", RNS.LOG_DEBUG)
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return identity
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else:
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RNS.log("Could not find "+RNS.prettyhexrep(destination_hash)+" in known destinations", RNS.LOG_DEBUG)
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return None
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@staticmethod
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def saveKnownDestinations():
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RNS.log("Saving known destinations to storage...", RNS.LOG_VERBOSE)
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file = open(RNS.Reticulum.storagepath+"/known_destinations","w")
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umsgpack.dump(Identity.known_destinations, file)
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file.close()
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RNS.log("Done saving known destinations to storage", RNS.LOG_VERBOSE)
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@staticmethod
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def loadKnownDestinations():
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if os.path.isfile(RNS.Reticulum.storagepath+"/known_destinations"):
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file = open(RNS.Reticulum.storagepath+"/known_destinations","r")
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Identity.known_destinations = umsgpack.load(file)
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file.close()
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RNS.log("Loaded "+str(len(Identity.known_destinations))+" known destinations from storage", RNS.LOG_VERBOSE)
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else:
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RNS.log("Destinations file does not exist, so no known destinations loaded", RNS.LOG_VERBOSE)
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@staticmethod
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def fullHash(data):
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digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
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digest.update(data)
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return digest.finalize()
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@staticmethod
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def truncatedHash(data):
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digest = hashes.Hash(hashes.SHA256(), backend=default_backend())
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digest.update(data)
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return digest.finalize()[:10]
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@staticmethod
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def getRandomHash():
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return Identity.truncatedHash(os.urandom(10))
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@staticmethod
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def validateAnnounce(packet):
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if packet.packet_type == RNS.Packet.ANNOUNCE:
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RNS.log("Validating announce from "+RNS.prettyhexrep(packet.destination_hash), RNS.LOG_VERBOSE)
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destination_hash = packet.destination_hash
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public_key = packet.data[10:Identity.DERKEYSIZE/8+10]
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random_hash = packet.data[Identity.DERKEYSIZE/8+10:Identity.DERKEYSIZE/8+20]
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signature = packet.data[Identity.DERKEYSIZE/8+20:Identity.DERKEYSIZE/8+20+Identity.KEYSIZE/8]
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app_data = ""
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if len(packet.data) > Identity.DERKEYSIZE/8+20+Identity.KEYSIZE/8:
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app_data = packet.data[Identity.DERKEYSIZE/8+20+Identity.KEYSIZE/8:]
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signed_data = destination_hash+public_key+random_hash+app_data
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announced_identity = Identity(public_only=True)
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announced_identity.loadPublicKey(public_key)
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if announced_identity.pub != None and announced_identity.validate(signature, signed_data):
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RNS.Identity.remember(RNS.Identity.fullHash(packet.raw), destination_hash, public_key)
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RNS.log("Stored valid announce from "+RNS.prettyhexrep(destination_hash), RNS.LOG_INFO)
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del announced_identity
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return True
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else:
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RNS.log("Received invalid announce", RNS.LOG_DEBUG)
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del announced_identity
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return False
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@staticmethod
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def exitHandler():
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Identity.saveKnownDestinations()
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@staticmethod
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def from_file(path):
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identity = Identity(public_only=True)
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if identity.load(path):
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return identity
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else:
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return None
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def __init__(self,public_only=False):
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# Initialize keys to none
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self.prv = None
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self.pub = None
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self.prv_bytes = None
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self.pub_bytes = None
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self.hash = None
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self.hexhash = None
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if not public_only:
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self.createKeys()
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def createKeys(self):
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self.prv = rsa.generate_private_key(
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public_exponent=65337,
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key_size=Identity.KEYSIZE,
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backend=default_backend()
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)
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self.prv_bytes = self.prv.private_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption()
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)
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self.pub = self.prv.public_key()
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self.pub_bytes = self.pub.public_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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self.updateHashes()
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RNS.log("Identity keys created for "+RNS.prettyhexrep(self.hash), RNS.LOG_VERBOSE)
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def getPrivateKey(self):
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return self.prv_bytes
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def getPublicKey(self):
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return self.pub_bytes
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def loadPrivateKey(self, prv_bytes):
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try:
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self.prv_bytes = prv_bytes
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self.prv = serialization.load_der_private_key(
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self.prv_bytes,
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password=None,
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backend=default_backend()
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)
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self.pub = self.prv.public_key()
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self.pub_bytes = self.pub.public_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PublicFormat.SubjectPublicKeyInfo
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)
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self.updateHashes()
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return True
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except Exception as e:
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RNS.log("Failed to load identity key", RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e))
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return False
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def loadPublicKey(self, key):
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try:
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self.pub_bytes = key
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self.pub = load_der_public_key(self.pub_bytes, backend=default_backend())
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self.updateHashes()
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except Exception as e:
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RNS.log("Error while loading public key, the contained exception was: "+str(e), RNS.LOG_ERROR)
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def updateHashes(self):
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self.hash = Identity.truncatedHash(self.pub_bytes)
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self.hexhash = self.hash.encode("hex_codec")
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def save(self, path):
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try:
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with open(path, "w") as key_file:
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key_file.write(self.prv_bytes)
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return True
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return False
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except Exception as e:
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RNS.log("Error while saving identity to "+str(path), RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e))
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def load(self, path):
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try:
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with open(path, "r") as key_file:
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prv_bytes = key_file.read()
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return self.loadPrivateKey(prv_bytes)
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return False
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except Exception as e:
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RNS.log("Error while loading identity from "+str(path), RNS.LOG_ERROR)
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RNS.log("The contained exception was: "+str(e))
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def encrypt(self, plaintext):
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if self.pub != None:
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chunksize = (Identity.KEYSIZE-Identity.PADDINGSIZE)/8
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chunks = int(math.ceil(len(plaintext)/(float(chunksize))))
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ciphertext = "";
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for chunk in range(chunks):
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start = chunk*chunksize
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end = (chunk+1)*chunksize
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if (chunk+1)*chunksize > len(plaintext):
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end = len(plaintext)
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ciphertext += self.pub.encrypt(
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plaintext[start:end],
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA1()),
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algorithm=hashes.SHA1(),
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label=None
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)
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)
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return ciphertext
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else:
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raise KeyError("Encryption failed because identity does not hold a public key")
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def decrypt(self, ciphertext):
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if self.prv != None:
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plaintext = None
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try:
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chunksize = (Identity.KEYSIZE)/8
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chunks = int(math.ceil(len(ciphertext)/(float(chunksize))))
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plaintext = "";
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for chunk in range(chunks):
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start = chunk*chunksize
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end = (chunk+1)*chunksize
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if (chunk+1)*chunksize > len(ciphertext):
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end = len(ciphertext)
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plaintext += self.prv.decrypt(
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ciphertext[start:end],
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padding.OAEP(
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mgf=padding.MGF1(algorithm=hashes.SHA1()),
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algorithm=hashes.SHA1(),
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label=None
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)
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)
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except:
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RNS.log("Decryption by "+RNS.prettyhexrep(self.hash)+" failed", RNS.LOG_VERBOSE)
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return plaintext;
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else:
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raise KeyError("Decryption failed because identity does not hold a private key")
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def sign(self, message):
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if self.prv != None:
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signer = self.prv.signer(
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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signer.update(message)
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return signer.finalize()
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else:
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raise KeyError("Signing failed because identity does not hold a private key")
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def validate(self, signature, message):
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if self.pub != None:
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try:
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self.pub.verify(
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signature,
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message,
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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return True
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except Exception as e:
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return False
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else:
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raise KeyError("Signature validation failed because identity does not hold a public key")
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def prove(self, packet, destination=None):
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signature = self.sign(packet.packet_hash)
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if RNS.Reticulum.should_use_implicit_proof():
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proof_data = signature
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else:
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proof_data = packet.packet_hash + signature
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if destination == None:
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destination = packet.generateProofDestination()
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proof = RNS.Packet(destination, proof_data, RNS.Packet.PROOF)
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proof.send()
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def __str__(self):
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return RNS.prettyhexrep(self.hash)
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