298 lines
10 KiB
Python
298 lines
10 KiB
Python
'''
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Onionr - P2P Microblogging Platform & Social network
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Core Onionr library, useful for external programs. Handles peer processing and cryptography.
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'''
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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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import sqlite3, os, sys, time, math, gnupg, base64, tarfile, getpass, simplecrypt, hashlib, nacl, logger
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from Crypto.Cipher import AES
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from Crypto import Random
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import netcontroller
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if sys.version_info < (3, 6):
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try:
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import sha3
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except ModuleNotFoundError:
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logger.fatal('On Python 3 versions prior to 3.6.x, you need the sha3 module')
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sys.exit(1)
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class Core:
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def __init__(self):
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'''
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Initialize Core Onionr library
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'''
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self.queueDB = 'data/queue.db'
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self.peerDB = 'data/peers.db'
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self.ownPGPID = ''
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self.blockDB = 'data/blocks.db'
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self.blockDataLocation = 'data/blocks/'
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return
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def generateMainPGP(self, myID):
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''' Generate the main PGP key for our client. Should not be done often.
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Uses own PGP home folder in the data/ directory. '''
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# Generate main pgp key
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if os.getenv('TRAVIS') == 'true':
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gpg = gnupg.GPG(homedir='./data/pgp/')
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else:
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gpg = gnupg.GPG(gnupghome='./data/pgp/')
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input_data = gpg.gen_key_input(key_type="RSA", key_length=2048, name_real=myID, name_email='anon@onionr')
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#input_data = gpg.gen_key_input(key_type="RSA", key_length=1024)
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key = gpg.gen_key(input_data)
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# Write the key
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myFingerpintFile = open('data/own-fingerprint.txt', 'w')
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myFingerpintFile.write(key.fingerprint)
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myFingerpintFile.close()
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return
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def addPeer(self, peerID, name=''):
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''' Add a peer by their ID, with an optional name, to the peer database.'''
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''' DOES NO SAFETY CHECKS if the ID is valid, but prepares the insertion. '''
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# This function simply adds a peer to the DB
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conn = sqlite3.connect(self.peerDB)
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c = conn.cursor()
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t = (peerID, name, 'unknown')
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c.execute('insert into peers (id, name, dateSeen) values(?, ?, ?);', t)
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conn.commit()
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conn.close()
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return True
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def createPeerDB(self):
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'''
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Generate the peer sqlite3 database and populate it with the peers table.
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'''
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# generate the peer database
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conn = sqlite3.connect(self.peerDB)
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c = conn.cursor()
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c.execute('''
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create table peers(
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ID text not null,
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name text,
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pgpKey text,
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hmacKey text,
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blockDBHash text,
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forwardKey text,
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dateSeen not null,
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bytesStored int,
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trust int);
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''')
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conn.commit()
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conn.close()
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def createBlockDB(self):
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'''
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Create a database for blocks
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hash - the hash of a block
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dateReceived - the date the block was recieved, not necessarily when it was created
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decrypted - if we can successfully decrypt the block (does not describe its current state)
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dataObtained - if the data has been obtained for the block
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'''
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if os.path.exists(self.blockDB):
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raise Exception("Block database already exists")
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conn = sqlite3.connect(self.blockDB)
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c = conn.cursor()
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c.execute('''create table hashes(
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hash text not null,
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dateReceived int,
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decrypted int,
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dataFound int,
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dataSaved int
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);
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''')
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conn.commit()
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conn.close()
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def addToBlockDB(self, newHash):
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'''add a hash value to the block db (should be in hex format)'''
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if not os.path.exists(self.blockDB):
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raise Exception('Block db does not exist')
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conn = sqlite3.connect(self.blockDB)
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c = conn.cursor()
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currentTime = math.floor(time.time())
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data = (newHash, currentTime, 0, 0)
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c.execute('INSERT into hashes values(?, ?, ?, ?);', data)
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conn.commit()
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conn.close()
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def getData(self,hash):
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'''simply return the data associated to a hash'''
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dataFile = open(self.blockDataLocation + hash + '.dat')
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data = dataFile.read()
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dataFile.close()
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return data
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def setData(self, data):
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'''set the data assciated with a hash'''
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data = data.encode()
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hasher = hashlib.sha3_256()
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hasher.update(data)
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dataHash = hasher.hexdigest()
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blockFileName = self.blockDataLocation + dataHash + '.dat'
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if os.path.exists(blockFileName):
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raise Exception("Data is already set for " + dataHash)
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else:
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blockFile = open(blockFileName, 'w')
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blockFile.write(data)
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blockFile.close()
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return dataHash
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def dataDirEncrypt(self, password):
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'''
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Encrypt the data directory on Onionr shutdown
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'''
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# Encrypt data directory (don't delete it in this function)
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if os.path.exists('data.tar'):
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os.remove('data.tar')
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tar = tarfile.open("data.tar", "w")
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for name in ['data']:
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tar.add(name)
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tar.close()
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tarData = open('data.tar', 'r', encoding = "ISO-8859-1").read()
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encrypted = simplecrypt.encrypt(password, tarData)
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open('data-encrypted.dat', 'wb').write(encrypted)
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os.remove('data.tar')
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return
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def dataDirDecrypt(self, password):
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'''
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Decrypt the data directory on startup
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'''
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# Decrypt data directory
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if not os.path.exists('data-encrypted.dat'):
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return (False, 'encrypted archive does not exist')
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data = open('data-encrypted.dat', 'rb').read()
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try:
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decrypted = simplecrypt.decrypt(password, data)
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except simplecrypt.DecryptionException:
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return (False, 'wrong password (or corrupted archive)')
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else:
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open('data.tar', 'wb').write(decrypted)
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tar = tarfile.open('data.tar')
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tar.extractall()
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tar.close()
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return (True, '')
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def daemonQueue(self):
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'''
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Gives commands to the communication proccess/daemon by reading an sqlite3 database
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'''
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# This function intended to be used by the client
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# Queue to exchange data between "client" and server.
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retData = False
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if not os.path.exists(self.queueDB):
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conn = sqlite3.connect(self.queueDB)
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c = conn.cursor()
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# Create table
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c.execute('''CREATE TABLE commands
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(id integer primary key autoincrement, command text, data text, date text)''')
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conn.commit()
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else:
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conn = sqlite3.connect(self.queueDB)
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c = conn.cursor()
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for row in c.execute('SELECT command, data, date, min(ID) FROM commands group by id'):
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retData = row
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break
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if retData != False:
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c.execute('delete from commands where id = ?', (retData[3],))
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conn.commit()
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conn.close()
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return retData
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def daemonQueueAdd(self, command, data=''):
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'''
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Add a command to the daemon queue, used by the communication daemon (communicator.py)
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'''
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# Intended to be used by the web server
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date = math.floor(time.time())
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conn = sqlite3.connect(self.queueDB)
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c = conn.cursor()
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t = (command, data, date)
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c.execute('INSERT into commands (command, data, date) values (?, ?, ?)', t)
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conn.commit()
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conn.close()
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return
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def generateHMAC(self):
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'''
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generate and return an HMAC key
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'''
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key = base64.b64encode(os.urandom(32))
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return key
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def listPeers(self):
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'''Return a list of peers
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'''
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conn = sqlite3.connect(self.peerDB)
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c = conn.cursor()
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peers = c.execute('SELECT * FROM peers;')
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peerList = []
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for i in peers:
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peerList.append(i[0])
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conn.close()
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return peerList
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def processBlocks(self):
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'''
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Work with the block database and download any missing blocks
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This is meant to be called from the communicator daemon on its timer.
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'''
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conn = sqlite3.connect(self.blockDB)
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c = conn.cursor()
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for i in blocks:
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pass
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conn.close()
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return
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def getPeerInfo(self, peer, info):
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'''
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get info about a peer
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id text 0
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name text, 1
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pgpKey text, 2
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hmacKey text, 3
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blockDBHash text, 4
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forwardKey text, 5
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dateSeen not null, 7
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bytesStored int, 8
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trust int 9
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'''
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# Lookup something about a peer from their database entry
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conn = sqlite3.connect(self.peerDB)
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c = conn.cursor()
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command = (peer,)
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infoNumbers = {'id': 0, 'name': 1, 'pgpKey': 2, 'hmacKey': 3, 'blockDBHash': 4, 'forwardKey': 5, 'dateSeen': 6, 'bytesStored': 7, 'trust': 8}
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info = infoNumbers[info]
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iterCount = 0
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retVal = ''
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for row in c.execute('SELECT * from peers where id=?;', command):
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for i in row:
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if iterCount == info:
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retVal = i
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break
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else:
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iterCount += 1
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conn.close()
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return retVal
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def getBlockList(self):
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'''get list of our blocks'''
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conn = sqlite3.connect(self.blockDB)
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c = conn.cursor()
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retData = ''
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for row in c.execute('SELECT hash FROM hashes;'):
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for i in row:
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retData += i
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return retData
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