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