def challenge():
#create host object
host = Host()
#Create a hash of the node's public key to send to the auth node for identity verification
keyhash = str(
base64.b64encode(
hashlib.sha256(
rsa_encrypt.get_pub_key().exportKey("PEM")).digest()), 'ascii')
#creates a payload of the message that identifies that this is a client node that needs to be updated
payload = "imup" + ":" + str(
comms_number) + ":" + keyhash + ":" + settings.ID
#create a socket to communicate with the auth nodes
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
#Create an empty data and address variable and a socket to recieve the data
data = ""
addr = 0
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as us:
#set a timeout for if there is no auth node ready
us.settimeout(1)
us.bind(('0.0.0.0', 55551))
#send the challenge tag to the auth nodes along with a public key to encrypt their return message with
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
"who?:" + keyhash), ((host.host, host.port)))
#Recv a number from the auth node to connect to
try:
data, addr = us.recvfrom(4096)
#if it fails return an error
except socket.timeout:
us.close()
return -1
#Decrypt the recieved message
data = aes_crypt.aes_dec(rsa_encrypt.get_priv_key(), data)
#if message is bad return error
if data == -1 or data == -2:
return -1
#convert data to a string to return to the auth nodes along with the instruction payload
data = str(data, 'ascii')
#send payload and return expected address
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
"you!:" + data + ":" + payload),
((host.host, host.port)))
return addr
def register(user, name, keys):
payload = "usrW" + ":" + rsa_encrypt.get_auth_hash() + ":" + user + ":" + name + ":" + ":".join(keys)
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
payload = aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), payload)
s.sendto(payload, (settings.MULT_ADDR, settings.MULT_PORT))
def contest_auth(address):
#open a socket to the reciever
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
#send the number
data = aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
str(my_number))
s.sendto(data, (address, 44443))
def challenge(my_number, kind):
#Creates a host object for use in multicast socket
host = Host()
#Creates a multicast socket to communicate with all auth nodes at once
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
#Creates a socket to recieve a unique number from the first auth node to respond to the contest
data = ""
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as us:
#sets a small timeout in case this is the first auth node in the system or the response is delayed
us.settimeout(1)
us.bind(('0.0.0.0', 55551))
#Sends a messafe to the other auth nodes to start a contest
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
"regA:" + str(my_number)),
((host.host, host.port)))
#Recieves encrypted number from auth node
data, address = us.recvfrom(4096)
#Decrypt the recieved number using auth private key
data = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_auth(), data)
#Check to make sure the message wasnt tampered with, return error if it was
if data == -1 or data == -2:
return 1
#convert the number to a string
data = str(data, 'ascii')
#encrypt the number with the auth public key and send it back to the auth nodes, letting them know which one was chosen and what action to preform
#in this case the asction is provising updates to the auth server
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
"you!:" + data + ":" + kind),
((host.host, host.port)))
return address
def send_share(share, host):
#Store the share as a string
payload = "auth:" + share['id'] + ":" + share['x'] + ":" + share['y']
#open a socket to the multicast address
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
#encrypt the share with the auth public key and send it to the multicast address
s.sendto(aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), payload),
((host.host, host.port)))
def db_send(db, num):
ts = str(time.time())
comms.database_log([db, num, ts])
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
"DBUP:" + db + ":" + num + ":" + ts),
(settings.MULT_ADDR, settings.MULT_PORT))
comms.send_clients()
def broadcast(uid):
print("Sending New Share to other Auth Nodes")
#instantiate a shares list
shares = []
#For each database
for i in settings.DBS:
#Open a connection to the db
conn = sqlite3.connect(settings.DBdir + i + ".db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Grab the provided user's share from this database
c.execute("SELECT * FROM enc_shares WHERE id = ?", [uid])
#append the share to the list and close the connection
shares.append(c.fetchone())
conn.close()
#Connect to the secrets database
conn = sqlite3.connect(settings.DBdir + "secrets.db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Grab the user's secret entry
c.execute("SELECT * FROM secrets WHERE id = ?", [uid])
#append the secret to the list and close the connection
shares.append(c.fetchone())
conn.close()
#Create an empty string to hold the data
data = ""
#For each share
for i in range(len(shares) - 1):
#Add no data if this is a delete message
if shares[i] == None:
data += "NONE||"
else:
#Append the share as a string to the data using the seperator ||
data += (
str(shares[i]['id']) + "|" +
str(shares[i]['share'] + "|" + str(shares[i]['timestamp'])) +
"||")
#Append the secrets entry to the data string
data += (str(shares[-1]['id']) + "|" + str(shares[-1]['name']) + "|" +
str(shares[-1]['secret']) + "|" + str(shares[-1]['timestamp']))
#Prepend a hash of the auth private key to the data
data = (rsa_encrypt.get_auth_hash() + "||" + data)
#Open a socket to the multicast address
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
#Set the data header
data = "here:" + str(my_number) + ":" + data
#Encrypt the data and send it to the auth nodes
payload = aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), data)
s.sendto(payload, (settings.MULT_ADDR, settings.MULT_PORT))
def broadcast(uid):
print("Sending New Share to other Auth Nodes")
#grab auth hash for use
auth_hash = rsa_encrypt.get_auth_hash()
#instantiate a shares list
shares = []
#open socket to multicast address
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
socket.IPPROTO_UDP) as s:
s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
#For each database
for i in settings.DBS:
#Open a connection to the db
conn = sqlite3.connect(settings.DBdir + i + ".db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Grab the provided user's share from this database
c.execute("SELECT * FROM enc_shares WHERE id = ?", [uid])
#append the share to the list and close the connection
shares.append(c.fetchone())
conn.close()
#Connect to the secrets database
conn = sqlite3.connect(settings.DBdir + "secrets.db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Grab the user's secret entry
c.execute("SELECT * FROM secrets WHERE id = ?", [uid])
#append the secret to the list and close the connection
shares.append(c.fetchone())
conn.close()
#For each share
for i in range(len(shares) - 1):
#Add no data if this is an empty message
if shares[i] == None:
continue
else:
#Grab the data from current database as a string
data = settings.DBS[i] + "||" + str(
shares[i]['id']) + "||" + str(
shares[i]['share']) + "||" + str(
shares[i]['timestamp'])
#prepend header and send data
data = "here:" + str(my_number) + ":" + auth_hash + "||" + data
s.sendto(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), data),
((settings.MULT_ADDR, settings.MULT_PORT)))
#grab the data from the secrets database as a string
data = "secrets||" + str(shares[-1]['id']) + "||" + str(
shares[-1]['name']) + "||" + str(
shares[-1]['secret']) + "||" + str(shares[-1]['timestamp'])
#Prepend header and send data
data = "here:" + str(my_number) + ":" + auth_hash + "||" + data
s.sendto(aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), data),
((settings.MULT_ADDR, settings.MULT_PORT)))
def updater(address):
#Open a socket to send the shares from, connecting to the provided address
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((address, 55552))
#create a random number for the challenge response authentication
challenge = int.from_bytes(Random.get_random_bytes(10), 'big')
#Send the number to the recieving node
s.send(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), str(challenge)))
#Get the number back, along with the updatee's timestamps
#Recieve until done
response = b""
temp = b""
try:
while 1 == 1:
temp = s.recv(4096)
if temp and len(temp) == 4096:
response += temp
else:
break
response += temp
#exit if connection breaks
except:
return -1
#decrypt response
response = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_auth(), response)
#return error if data is corrupted
if response == -1 or response == -2:
return -1
#split response into timestamp and the response number
response = str(response, 'ascii').split(":")
#confirm that the response is correct
if (challenge + 1) == int(response[0], 0):
#grab timestamp
timestamps = response[1].split("|")
#create holder for share information
data = ""
#for each database
for i in settings.DBS:
#set up connection
conn = sqlite3.connect(settings.DBdir + i + ".db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Make sure table exists
c.execute(
"CREATE TABLE IF NOT EXISTS enc_shares(id PRIMARY KEY, share, timestamp DOUBLE)"
)
#Grab all shares from the current database with timestamp greater than the client's timestamp
c.execute("SELECT * FROM enc_shares")
d = c.fetchall()
shares = []
#for each share
for i in range(len(d)):
#Join the components into a string if they are needed by the updatee
if not str(d[i]['timestamp']) in timestamps:
shares.append(d[i]["id"] + "|" + d[i]["share"] + "|" +
str(d[i]["timestamp"]))
#Join each share together
shares = "::".join(shares)
#add the information from this database to the database string
data += (shares + ":::")
#close connection
conn.close()
#open the secrets db
conn = sqlite3.connect(settings.DBdir + "secrets.db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#make sure table exists
c.execute(
"CREATE TABLE IF NOT EXISTS secrets(id PRIMARY KEY, name, secret, timestamp DOUBLE)"
)
#Grab all shares past the client timestamp
c.execute("SELECT * FROM secrets")
d = c.fetchall()
secrets = []
#For each secret
for i in range(len(d)):
#convert the share to a string if it is needed by the updatee
if not str(d[i]['timestamp']) in timestamps:
secrets.append(d[i]["id"] + "|" + d[i]["name"] + "|" +
d[i]["secret"] + "|" +
str(d[i]['timestamp']))
#join all the shares and add them to the db string
data += "::".join(secrets)
#send the databases to the client and exit
s.send(aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), data))
return 0
def updateee(my_number):
#open socket to recieve shares into
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind(('0.0.0.0', 55552))
s.listen(5)
address = 0
#Attempt to update the node
try:
#make sure that challenge exits succesfully and grab host address
address = challenge(my_number, "woke")
while address == 1:
address = challenge(my_number, "woke")
#If socket times out then return, this is likely the first auth node to be activated
except socket.timeout:
print("No Auth Nodes Found")
return
#accept connection from the node that shares will be pulled from
cli, addr = s.accept()
while not addr[0] == address[0]:
cli, addr = s.accept()
#Challenge response authentication, the node recieves a number from the auth node responsible for the update
#and sends the number + 1 to the other node
data = cli.recv(1024)
#decrypt number and increment it by one
data = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_auth(), data)
data = str(data, 'ascii')
data = str(int(data) + 1)
#encrypt number and return it to the host
#send the timestamp of the most recent share along with the number
timestamps = grab_timestamps()
cli.send(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
data + ":" + timestamps))
#Recv data until the sender is done
data = b""
temp = b""
try:
while 1 == 1:
temp = cli.recv(4096)
if temp and len(temp) == 4096:
data += temp
else:
break
data += temp
#if the sender loses the connection then quit
except:
print("registered: 0 updates")
return
#Decrypt the data with the auth private key
data = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_auth(), data)
#if the data is invalid return error
if data == -2 or data == -1:
return -1
#if no databases hold data then return
if data == b':::' * settings.TOTAL:
print("registered: 0 updates")
return
#split the data into a list of databases
data = str(data, 'ascii').split(":::")
#for each database split the entries into a list
for i in range(len(data)):
data[i] = data[i].split("::")
#store the list of db's into a disctonary
#they are sent in the order they are listed in settings.py
updates = {}
for i in range(len(settings.DBS)):
updates[settings.DBS[i]] = data[i]
#store the secrets database into the dictionary
updates['secrets'] = data[-1]
#fill the databases
fill_dbs(updates)
#exit, ptinting the number of shares that were updated
print("registered: " + str(len(updates['secrets'])) + " updates")
return
def register():
#Create socket to recieve updates from
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.settimeout(5)
s.bind(("0.0.0.0", 55550))
s.listen(5)
#make sure that challenge executes correctly, else return error
print("Looking for Auth Node")
address = challenge()
if address == -1:
return -1
#Create a connection with the auth node, if it is not the
#expected address than continue waiting
try:
cli, addr = s.accept()
while not addr[0] == address[0]:
cli, addr = s.accept()
except socket.timeout:
return -1
#Report
print("Recieving Updates Now")
#Recieve two sums for challenge response authentication
#One for the database and one for the public key
sums = cli.recv(2048).split(b"::")
#Decrypt the sums using the node and db public keys
sums[0] = aes_crypt.aes_dec(rsa_encrypt.get_priv_key(), sums[0])
sums[1] = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_db(settings.ID),
sums[1])
#if there is an error in the communication of the sums return an error
if sums[0] == -1 or sums[0] == -2 or sums[1] == -1 or sums[1] == -2:
return 1
#Increment the sums and return them via the auth public key
sum1 = str(int(sums[0]) + 1)
sum2 = str(int(sums[1]) + 1)
#send the incremented sums back to proove node identity
payload = aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(),
sum1 + ":" + sum2)
#Fill recv buffer
cli.send(payload + b"\x00" * (4096 - len(payload)))
#Grab the latest timestamp
timestamps = grab_timestamps()
#Send the timestamp encrypted with the auth public key
cli.send(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), str(timestamps)))
#Run the update process
num_updates = shamir_updater.update(cli)
#make number presentable
if num_updates == -1:
num_updates = 0
#Report shares
print("Registered: " + str(num_updates) + " updates")
#clean up and exit
cli.close()
return
def updater(address):
#Open a socket to send the shares from, connecting to the provided address
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((address, 44441))
#create a random number for the challenge response authentication
challenge = int.from_bytes(Random.get_random_bytes(10), 'big')
#Send the number to the recieving node
s.send(
aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), str(challenge)))
#Get the number back, along with the most recent timestamp that the recieving server has
response = s.recv(2048)
#decrypt response
response = aes_crypt.aes_dec(rsa_encrypt.get_priv_key_auth(), response)
#return error if data is corrupted
if response == -1 or response == -2:
return -1
#split response into timestamp and the response number
response = str(response, 'ascii').split(":")
#confirm that the response is correct
if (challenge + 1) == int(response[0], 0):
#grab timestamp
timestamp = response[1]
#create holder for share information
data = ""
#for each database
for i in settings.DBS:
#set up connection
conn = sqlite3.connect(settings.DBdir + i + ".db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#Make sure table exists
c.execute(
"CREATE TABLE IF NOT EXISTS enc_shares(id PRIMARY KEY, share, timestamp DOUBLE)"
)
#Grab all shares from the current database with timestamp greater than the client's timestamp
c.execute("SELECT * FROM enc_shares WHERE timestamp > ?",
[float(timestamp)])
d = c.fetchall()
#for each share
for i in range(len(d)):
#Join the components into a string
d[i] = d[i]["id"] + "|" + d[i]["share"] + "|" + str(
d[i]["timestamp"])
#Join each share together
d = "::".join(d)
#add the information from this database to the database string
data += (d + ":::")
#close connection
conn.close()
#open the secrets db
conn = sqlite3.connect(settings.DBdir + "secrets.db")
conn.row_factory = sqlite3.Row
c = conn.cursor()
#make sure table exists
c.execute(
"CREATE TABLE IF NOT EXISTS secrets(id PRIMARY KEY, name, secret, timestamp DOUBLE)"
)
#Grab all shares past the client timestamp
c.execute("SELECT * FROM secrets WHERE timestamp > ?",
[float(timestamp)])
d = c.fetchall()
#For each share
for i in range(len(d)):
#convert the share to a string
d[i] = d[i]["id"] + "|" + d[i]["name"] + "|" + d[i][
"secret"] + "|" + str(d[i]['timestamp'])
#join all the shares and add them to the db string
data += "::".join(d)
#send the databases to the client and exit
s.send(aes_crypt.aes_enc(rsa_encrypt.get_pub_key_auth(), data))
return 0