696 lines
22 KiB
Python
Executable File
696 lines
22 KiB
Python
Executable File
'''
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Onionr - P2P Anonymous Storage Network
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This file contains the OnionrBlocks class which is a class for working with Onionr blocks
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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 logger, config, onionrexceptions, nacl.exceptions
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import json, os, sys, datetime, base64, onionrstorage
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from onionrusers import onionrusers
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from onionrutils import stringvalidators, epoch
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from coredb import blockmetadb
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from onionrstorage import removeblock
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import onionrblocks
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from onionrcrypto import encryption, cryptoutils as cryptoutils, signing
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class Block:
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blockCacheOrder = list() # NEVER write your own code that writes to this!
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blockCache = dict() # should never be accessed directly, look at Block.getCache()
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def __init__(self, hash = None, type = None, content = None, expire=None, decrypt=False, bypassReplayCheck=False):
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# take from arguments
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# sometimes people input a bytes object instead of str in `hash`
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if (not hash is None) and isinstance(hash, bytes):
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hash = hash.decode()
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self.hash = hash
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self.btype = type
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self.bcontent = content
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self.expire = expire
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self.bypassReplayCheck = bypassReplayCheck
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# initialize variables
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self.valid = True
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self.raw = None
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self.signed = False
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self.signature = None
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self.signedData = None
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self.blockFile = None
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self.parent = None
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self.bheader = {}
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self.bmetadata = {}
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self.isEncrypted = False
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self.decrypted = False
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self.signer = None
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self.validSig = False
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self.autoDecrypt = decrypt
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self.update()
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def decrypt(self, encodedData = True):
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'''
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Decrypt a block, loading decrypted data into their vars
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'''
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if self.decrypted:
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return True
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retData = False
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# decrypt data
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if self.getHeader('encryptType') == 'asym':
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try:
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self.bcontent = encryption.pub_key_decrypt(self.bcontent, encodedData=encodedData)
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bmeta = encryption.pub_key_decrypt(self.bmetadata, encodedData=encodedData)
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try:
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bmeta = bmeta.decode()
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except AttributeError:
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# yet another bytes fix
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pass
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self.bmetadata = json.loads(bmeta)
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self.signature = encryption.pub_key_decrypt(self.signature, encodedData=encodedData)
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self.signer = encryption.pub_key_decrypt(self.signer, encodedData=encodedData)
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self.bheader['signer'] = self.signer.decode()
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self.signedData = json.dumps(self.bmetadata) + self.bcontent.decode()
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# Check for replay attacks
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try:
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if epoch.get_epoch() - blockmetadb.get_block_date(self.hash) > 60:
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assert cryptoutils.replay_validator(self.bmetadata['rply'])
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except (AssertionError, KeyError, TypeError) as e:
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if not self.bypassReplayCheck:
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# Zero out variables to prevent reading of replays
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self.bmetadata = {}
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self.signer = ''
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self.bheader['signer'] = ''
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self.signedData = ''
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self.signature = ''
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raise onionrexceptions.ReplayAttack('Signature is too old. possible replay attack')
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try:
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assert self.bmetadata['forwardEnc'] is True
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except (AssertionError, KeyError) as e:
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pass
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else:
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try:
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self.bcontent = onionrusers.OnionrUser(self.signer).forwardDecrypt(self.bcontent)
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except (onionrexceptions.DecryptionError, nacl.exceptions.CryptoError) as e:
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logger.error(str(e))
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pass
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except nacl.exceptions.CryptoError:
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pass
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#logger.debug('Could not decrypt block. Either invalid key or corrupted data')
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except onionrexceptions.ReplayAttack:
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logger.warn('%s is possibly a replay attack' % (self.hash,))
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else:
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retData = True
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self.decrypted = True
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else:
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logger.warn('symmetric decryption is not yet supported by this API')
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return retData
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def verifySig(self):
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'''
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Verify if a block's signature is signed by its claimed signer
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'''
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if signing.ed_verify(data=self.signedData, key=self.signer, sig=self.signature, encodedData=True):
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self.validSig = True
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else:
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self.validSig = False
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return self.validSig
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def update(self, data = None, file = None):
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'''
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Loads data from a block in to the current object.
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Inputs:
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- data (str):
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- if None: will load from file by hash
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- else: will load from `data` string
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- file (str):
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- if None: will load from file specified in this parameter
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- else: will load from wherever block is stored by hash
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Outputs:
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- (bool): indicates whether or not the operation was successful
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'''
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try:
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# import from string
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blockdata = data
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# import from file
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if blockdata is None:
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try:
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blockdata = onionrstorage.getData(self.getHash()).decode()
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except AttributeError:
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raise onionrexceptions.NoDataAvailable('Block does not exist')
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else:
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self.blockFile = None
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# parse block
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self.raw = str(blockdata)
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self.bheader = json.loads(self.getRaw()[:self.getRaw().index('\n')])
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self.bcontent = self.getRaw()[self.getRaw().index('\n') + 1:]
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if ('encryptType' in self.bheader) and (self.bheader['encryptType'] in ('asym', 'sym')):
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self.bmetadata = self.getHeader('meta', None)
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self.isEncrypted = True
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else:
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self.bmetadata = json.loads(self.getHeader('meta', None))
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self.parent = self.getMetadata('parent', None)
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self.btype = self.getMetadata('type', None)
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self.signed = ('sig' in self.getHeader() and self.getHeader('sig') != '')
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# TODO: detect if signer is hash of pubkey or not
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self.signer = self.getHeader('signer', None)
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self.signature = self.getHeader('sig', None)
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# signed data is jsonMeta + block content (no linebreak)
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self.signedData = (None if not self.isSigned() else self.getHeader('meta') + self.getContent())
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self.date = blockmetadb.get_block_date(self.getHash())
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self.claimedTime = self.getHeader('time', None)
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if not self.getDate() is None:
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self.date = datetime.datetime.fromtimestamp(self.getDate())
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self.valid = True
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if len(self.getRaw()) <= config.get('allocations.blockCache', 500000):
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self.cache()
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if self.autoDecrypt:
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self.decrypt()
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return True
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except Exception as e:
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logger.warn('Failed to parse block %s.' % self.getHash(), error = e, timestamp = False)
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# if block can't be parsed, it's a waste of precious space. Throw it away.
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if not self.delete():
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logger.warn('Failed to delete invalid block %s.' % self.getHash(), error = e)
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else:
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logger.debug('Deleted invalid block %s.' % self.getHash(), timestamp = False)
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self.valid = False
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return False
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def delete(self):
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'''
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Deletes the block's file and records, if they exist
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Outputs:
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- (bool): whether or not the operation was successful
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'''
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if self.exists():
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try:
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os.remove(self.getBlockFile())
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except TypeError:
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pass
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removeblock.remove_block(self.getHash())
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return True
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return False
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def save(self, sign = False, recreate = True):
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'''
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Saves a block to file and imports it into Onionr
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Inputs:
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- sign (bool): whether or not to sign the block before saving
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- recreate (bool): if the block already exists, whether or not to recreate the block and save under a new hash
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Outputs:
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- (bool): whether or not the operation was successful
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'''
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try:
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if self.isValid() is True:
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self.hash = onionrblocks.insert(self.getRaw(), header = self.getType(), sign = sign, meta = self.getMetadata(), expire = self.getExpire())
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if self.hash != False:
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self.update()
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return self.getHash()
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else:
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logger.warn('Not writing block; it is invalid.')
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except Exception as e:
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logger.error('Failed to save block.', error = e, timestamp = False)
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return False
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# getters
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def getExpire(self):
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'''
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Returns the expire time for a block
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Outputs:
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- (int): the expire time for a block, or None
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'''
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return self.expire
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def getHash(self):
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'''
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Returns the hash of the block if saved to file
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Outputs:
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- (str): the hash of the block, or None
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'''
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return self.hash
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def getType(self):
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'''
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Returns the type of the block
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Outputs:
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- (str): the type of the block
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'''
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return self.btype
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def getRaw(self):
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'''
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Returns the raw contents of the block, if saved to file
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Outputs:
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- (str): the raw contents of the block, or None
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'''
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return str(self.raw)
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def getHeader(self, key = None, default = None):
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'''
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Returns the header information
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Inputs:
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- key (str): only returns the value of the key in the header
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Outputs:
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- (dict/str): either the whole header as a dict, or one value
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'''
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if not key is None:
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if key in self.getHeader():
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return self.getHeader()[key]
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return default
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return self.bheader
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def getMetadata(self, key = None, default = None):
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'''
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Returns the metadata information
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Inputs:
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- key (str): only returns the value of the key in the metadata
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Outputs:
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- (dict/str): either the whole metadata as a dict, or one value
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'''
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if not key is None:
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if key in self.getMetadata():
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return self.getMetadata()[key]
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return default
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return self.bmetadata
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def getContent(self):
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'''
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Returns the contents of the block
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Outputs:
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- (str): the contents of the block
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'''
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return str(self.bcontent)
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def getParent(self):
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'''
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Returns the Block's parent Block, or None
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Outputs:
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- (Block): the Block's parent
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'''
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if type(self.parent) == str:
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if self.parent == self.getHash():
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self.parent = self
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elif Block.exists(self.parent):
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self.parent = Block(self.getMetadata('parent'))
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else:
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self.parent = None
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return self.parent
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def getDate(self):
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'''
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Returns the date that the block was received, if loaded from file
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Outputs:
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- (datetime): the date that the block was received
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'''
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return self.date
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def getBlockFile(self):
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'''
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Returns the location of the block file if it is saved
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Outputs:
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- (str): the location of the block file, or None
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'''
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return self.blockFile
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def isValid(self):
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'''
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Checks if the block is valid
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Outputs:
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- (bool): whether or not the block is valid
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'''
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return self.valid
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def isSigned(self):
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'''
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Checks if the block was signed
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Outputs:
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- (bool): whether or not the block is signed
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'''
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return self.signed
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def getSignature(self):
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'''
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Returns the base64-encoded signature
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Outputs:
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- (str): the signature, or None
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'''
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return self.signature
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def getSignedData(self):
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'''
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Returns the data that was signed
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Outputs:
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- (str): the data that was signed, or None
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'''
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return self.signedData
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def isSigner(self, signer, encodedData = True):
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'''
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Checks if the block was signed by the signer inputted
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Inputs:
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- signer (str): the public key of the signer to check against
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- encodedData (bool): whether or not the `signer` argument is base64 encoded
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Outputs:
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- (bool): whether or not the signer of the block is the signer inputted
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'''
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try:
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if (not self.isSigned()) or (not stringvalidators.validate_pub_key(signer)):
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return False
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return bool(signing.ed_verify(self.getSignedData(), signer, self.getSignature(), encodedData = encodedData))
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except:
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return False
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# setters
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def setType(self, btype):
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'''
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Sets the type of the block
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Inputs:
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- btype (str): the type of block to be set to
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Outputs:
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- (Block): the Block instance
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'''
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self.btype = btype
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return self
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def setMetadata(self, key, val):
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'''
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Sets a custom metadata value
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Metadata should not store block-specific data structures.
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Inputs:
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- key (str): the key
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- val: the value (type is irrelevant)
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Outputs:
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- (Block): the Block instance
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'''
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if key == 'parent' and (not val is None) and (not val == self.getParent().getHash()):
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self.setParent(val)
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else:
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self.bmetadata[key] = val
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return self
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def setContent(self, bcontent):
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'''
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Sets the contents of the block
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Inputs:
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- bcontent (str): the contents to be set to
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Outputs:
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- (Block): the Block instance
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'''
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self.bcontent = str(bcontent)
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return self
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def setParent(self, parent):
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'''
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Sets the Block's parent
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Inputs:
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- parent (Block/str): the Block's parent, to be stored in metadata
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Outputs:
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- (Block): the Block instance
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'''
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if type(parent) == str:
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parent = Block(parent)
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self.parent = parent
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self.setMetadata('parent', (None if parent is None else self.getParent().getHash()))
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return self
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# static functions
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def getBlocks(type = None, signer = None, signed = None, parent = None, reverse = False, limit = None):
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'''
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Returns a list of Block objects based on supplied filters
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Inputs:
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- type (str): filters by block type
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- signer (str/list): filters by signer (one in the list has to be a signer)
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- signed (bool): filters out by whether or not the block is signed
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- reverse (bool): reverses the list if True
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Outputs:
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- (list): a list of Block objects that match the input
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'''
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try:
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if (not parent is None) and (not isinstance(parent, Block)):
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parent = Block(hash = parent)
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relevant_blocks = list()
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blocks = (blockmetadb.get_block_list() if type is None else blockmetadb.get_blocks_by_type(type))
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for block in blocks:
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if Block.exists(block):
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block = Block(block)
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relevant = True
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if (not signed is None) and (block.isSigned() != bool(signed)):
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relevant = False
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if not signer is None:
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if isinstance(signer, (str,)):
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signer = [signer]
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if isinstance(signer, (bytes,)):
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signer = [signer.decode()]
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isSigner = False
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for key in signer:
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if block.isSigner(key):
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isSigner = True
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break
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if not isSigner:
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relevant = False
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if not parent is None:
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blockParent = block.getParent()
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if blockParent is None:
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relevant = False
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else:
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relevant = parent.getHash() == blockParent.getHash()
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if relevant and (limit is None or len(relevant_Blocks) <= int(limit)):
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relevant_blocks.append(block)
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if bool(reverse):
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relevant_blocks.reverse()
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return relevant_blocks
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except Exception as e:
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logger.debug('Failed to get blocks.', error = e)
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return list()
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def mergeChain(child, file = None, maximumFollows = 1000):
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'''
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Follows a child Block to its root parent Block, merging content
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Inputs:
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- child (str/Block): the child Block to be followed
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- file (str/file): the file to write the content to, instead of returning it
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- maximumFollows (int): the maximum number of Blocks to follow
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'''
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maximumFollows = max(0, maximumFollows)
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# type conversions
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if type(child) == list:
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child = child[-1]
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if type(child) == str:
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child = Block(child)
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if (not file is None) and (type(file) == str):
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file = open(file, 'ab')
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# only store hashes to avoid intensive memory usage
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blocks = [child.getHash()]
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|
|
|
# generate a list of parent Blocks
|
|
while True:
|
|
# end if the maximum number of follows has been exceeded
|
|
if len(blocks) - 1 >= maximumFollows:
|
|
break
|
|
|
|
block = Block(blocks[-1]).getParent()
|
|
|
|
# end if there is no parent Block
|
|
if block is None:
|
|
break
|
|
|
|
# end if the Block is pointing to a previously parsed Block
|
|
if block.getHash() in blocks:
|
|
break
|
|
|
|
# end if the block is not valid
|
|
if not block.isValid():
|
|
break
|
|
|
|
blocks.append(block.getHash())
|
|
|
|
buffer = b''
|
|
|
|
# combine block contents
|
|
for hash in blocks:
|
|
block = Block(hash)
|
|
contents = block.getContent()
|
|
contents = base64.b64decode(contents.encode())
|
|
|
|
if file is None:
|
|
try:
|
|
buffer += contents.encode()
|
|
except AttributeError:
|
|
buffer += contents
|
|
else:
|
|
file.write(contents)
|
|
if file is not None:
|
|
file.close()
|
|
|
|
return (None if not file is None else buffer)
|
|
|
|
def exists(bHash):
|
|
'''
|
|
Checks if a block is saved to file or not
|
|
|
|
Inputs:
|
|
- hash (str/Block):
|
|
- if (Block): check if this block is saved to file
|
|
- if (str): check if a block by this hash is in file
|
|
|
|
Outputs:
|
|
- (bool): whether or not the block file exists
|
|
'''
|
|
|
|
# no input data? scrap it.
|
|
if bHash is None:
|
|
return False
|
|
|
|
if isinstance(bHash, Block):
|
|
bHash = bHash.getHash()
|
|
|
|
ret = isinstance(onionrstorage.getData(bHash), type(None))
|
|
|
|
return not ret
|
|
|
|
def getCache(hash = None):
|
|
# give a list of the hashes of the cached blocks
|
|
if hash is None:
|
|
return list(Block.blockCache.keys())
|
|
|
|
# if they inputted self or a Block, convert to hash
|
|
if type(hash) == Block:
|
|
hash = hash.getHash()
|
|
|
|
# just to make sure someone didn't put in a bool or something lol
|
|
hash = str(hash)
|
|
|
|
# if it exists, return its content
|
|
if hash in Block.getCache():
|
|
return Block.blockCache[hash]
|
|
|
|
return None
|
|
|
|
def cache(block, override = False):
|
|
# why even bother if they're giving bad data?
|
|
if not type(block) == Block:
|
|
return False
|
|
|
|
# only cache if written to file
|
|
if block.getHash() is None:
|
|
return False
|
|
|
|
# if it's already cached, what are we here for?
|
|
if block.getHash() in Block.getCache() and not override:
|
|
return False
|
|
|
|
# dump old cached blocks if the size exceeds the maximum
|
|
if sys.getsizeof(Block.blockCacheOrder) >= config.get('allocations.block_cache_total', 50000000): # 50MB default cache size
|
|
del Block.blockCache[blockCacheOrder.pop(0)]
|
|
|
|
# cache block content
|
|
Block.blockCache[block.getHash()] = block.getRaw()
|
|
Block.blockCacheOrder.append(block.getHash())
|
|
|
|
return True
|