Onionr/src/onionrusers/onionrusers.py

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'''
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Onionr - Private P2P Communication
Contains abstractions for interacting with users of Onionr
'''
'''
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
import logger, onionrexceptions, json, sqlite3, time
from onionrutils import stringvalidators, bytesconverter, epoch
import unpaddedbase32
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import nacl.exceptions
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from coredb import keydb, dbfiles
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import onionrcrypto
from onionrcrypto import getourkeypair
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def deleteExpiredKeys():
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# Fetch the keys we generated for the peer, that are still around
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conn = sqlite3.connect(dbfiles.forward_keys_db, timeout=10)
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c = conn.cursor()
curTime = epoch.get_epoch()
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c.execute("DELETE from myForwardKeys where expire <= ?", (curTime,))
conn.commit()
conn.execute("VACUUM")
conn.close()
return
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def deleteTheirExpiredKeys(pubkey):
conn = sqlite3.connect(dbfiles.user_id_info_db, timeout=10)
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c = conn.cursor()
# Prepare the insert
command = (pubkey, epoch.get_epoch())
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c.execute("DELETE from forwardKeys where peerKey = ? and expire <= ?", command)
conn.commit()
conn.close()
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DEFAULT_KEY_EXPIRE = 604800
class OnionrUser:
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def __init__(self, publicKey, saveUser=False):
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'''
OnionrUser is an abstraction for "users" of the network.
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Takes a base32 encoded ed25519 public key, and a bool saveUser
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saveUser determines if we should add a user to our peer database or not.
'''
publicKey = unpaddedbase32.repad(bytesconverter.str_to_bytes(publicKey)).decode()
self.trust = 0
self.publicKey = publicKey
if saveUser and not publicKey == getourkeypair.get_keypair():
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try:
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keydb.addkeys.add_peer(publicKey)
except (AssertionError, ValueError) as e:
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pass
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self.trust = keydb.userinfo.get_user_info(self.publicKey, 'trust')
return
def setTrust(self, newTrust):
'''Set the peers trust. 0 = not trusted, 1 = friend, 2 = ultimate'''
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keydb.userinfo.set_user_info(self.publicKey, 'trust', newTrust)
def isFriend(self):
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if keydb.userinfo.set_peer_info(self.publicKey, 'trust') == 1:
return True
return False
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def getName(self):
retData = 'anonymous'
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name = keydb.userinfo.get_user_info(self.publicKey, 'name')
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try:
if len(name) > 0:
retData = name
except ValueError:
pass
return retData
def encrypt(self, data):
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encrypted = onionrcrypto.encryption.pub_key_encrypt(data, self.publicKey, encodedData=True)
return encrypted
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def decrypt(self, data):
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decrypted = onionrcrypto.encryption.pub_key_decrypt(data, self.publicKey, encodedData=True)
return decrypted
def forwardEncrypt(self, data):
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deleteTheirExpiredKeys(self.publicKey)
deleteExpiredKeys()
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retData = ''
forwardKey = self._getLatestForwardKey()
if stringvalidators.validate_pub_key(forwardKey[0]):
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retData = onionrcrypto.encryption.pub_key_encrypt(data, forwardKey[0], encodedData=True)
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else:
raise onionrexceptions.InvalidPubkey("No valid forward secrecy key available for this user")
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#self.generateForwardKey()
return (retData, forwardKey[0], forwardKey[1])
def forwardDecrypt(self, encrypted):
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retData = ""
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for key in self.getGeneratedForwardKeys(False):
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try:
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retData = onionrcrypto.encryption.pub_key_decrypt(encrypted, privkey=key[1], encodedData=True)
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except nacl.exceptions.CryptoError:
retData = False
else:
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break
else:
raise onionrexceptions.DecryptionError("Could not decrypt forward secrecy content")
return retData
def _getLatestForwardKey(self):
# Get the latest forward secrecy key for a peer
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key = ""
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conn = sqlite3.connect(dbfiles.user_id_info_db, timeout=10)
c = conn.cursor()
# TODO: account for keys created at the same time (same epoch)
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for row in c.execute("SELECT forwardKey, max(EXPIRE) FROM forwardKeys WHERE peerKey = ? ORDER BY expire DESC", (self.publicKey,)):
key = (row[0], row[1])
break
conn.commit()
conn.close()
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return key
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def _getForwardKeys(self):
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conn = sqlite3.connect(dbfiles.user_id_info_db, timeout=10)
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c = conn.cursor()
keyList = []
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for row in c.execute("SELECT forwardKey, date FROM forwardKeys WHERE peerKey = ? ORDER BY expire DESC", (self.publicKey,)):
keyList.append((row[0], row[1]))
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conn.commit()
conn.close()
return list(keyList)
def generateForwardKey(self, expire=DEFAULT_KEY_EXPIRE):
# Generate a forward secrecy key for the peer
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conn = sqlite3.connect(dbfiles.forward_keys_db, timeout=10)
c = conn.cursor()
# Prepare the insert
time = epoch.get_epoch()
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newKeys = onionrcrypto.generate()
newPub = bytesconverter.bytes_to_str(newKeys[0])
newPriv = bytesconverter.bytes_to_str(newKeys[1])
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command = (self.publicKey, newPub, newPriv, time, expire + time)
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c.execute("INSERT INTO myForwardKeys VALUES(?, ?, ?, ?, ?);", command)
conn.commit()
conn.close()
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return newPub
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def getGeneratedForwardKeys(self, genNew=True):
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# Fetch the keys we generated for the peer, that are still around
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conn = sqlite3.connect(dbfiles.forward_keys_db, timeout=10)
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c = conn.cursor()
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pubkey = self.publicKey
pubkey = bytesconverter.bytes_to_str(pubkey)
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command = (pubkey,)
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keyList = [] # list of tuples containing pub, private for peer
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for result in c.execute("SELECT * FROM myForwardKeys WHERE peer = ?", command):
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keyList.append((result[1], result[2]))
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if len(keyList) == 0:
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if genNew:
self.generateForwardKey()
keyList = self.getGeneratedForwardKeys()
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return list(keyList)
def addForwardKey(self, newKey, expire=DEFAULT_KEY_EXPIRE):
newKey = bytesconverter.bytes_to_str(unpaddedbase32.repad(bytesconverter.str_to_bytes(newKey)))
if not stringvalidators.validate_pub_key(newKey):
# Do not add if something went wrong with the key
raise onionrexceptions.InvalidPubkey(newKey)
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conn = sqlite3.connect(dbfiles.user_id_info_db, timeout=10)
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c = conn.cursor()
# Get the time we're inserting the key at
timeInsert = epoch.get_epoch()
# Look at our current keys for duplicate key data or time
for entry in self._getForwardKeys():
if entry[0] == newKey:
return False
if entry[1] == timeInsert:
timeInsert += 1
time.sleep(1) # Sleep if our time is the same in order to prevent duplicate time records
# Add a forward secrecy key for the peer
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# Prepare the insert
command = (self.publicKey, newKey, timeInsert, timeInsert + expire)
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c.execute("INSERT INTO forwardKeys VALUES(?, ?, ?, ?);", command)
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conn.commit()
conn.close()
return True
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@classmethod
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def list_friends(cls):
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friendList = []
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for x in keydb.listkeys.list_peers(trust=1):
friendList.append(cls(x))
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return list(friendList)