combox

split and encrypted files between online file storage providers
git clone git://git.ricketyspace.net/combox.git
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commit 5ca3c5ff9fb1b39884c9864142fdb4bc430494f9
parent 92633ad0d4cd4c7ff7a811460b9691842af15276
Author: Siddharth Ravikumar <sravik@bgsu.edu>
Date:   Mon, 12 Jan 2015 17:33:47 -0500

added back   combox/config.py and  combox/crypto.py

Diffstat:
combox/config.py | 82+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
combox/crypto.py | 84+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 166 insertions(+), 0 deletions(-)

diff --git a/combox/config.py b/combox/config.py @@ -0,0 +1,82 @@ +# Copyright (C) 2014 Combox author(s). See AUTHORS. +# +# This file is part of Combox. +# +# Combox 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. +# +# Combox 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 Combox (see COPYING). If not, see +# <http://www.gnu.org/licenses/>. + +################################################## +## YAML Config format +################################################## +## +## combox_dir: path/to/combox/ +## +## topsecret: dba0079f1cb3a3b56e102dd5e04fa2af +## +## nodes_info: +## node_name: +## path: path/to/shard1/dir/ +## size: 1000 # in MB +## available: 500 # in MB +## node name: +## path: path/to/shard2/dir/ +## size: 2000 +## available: 1500 +## node name: +## path: path/to/shard3/dir +## size: 3000 +## available: 1500 +## +################################################## + +import os +import yaml +import getpass +import hashlib +import sys +import stat + + +def config_cb(): + """ + Configure combox, if not already configured. + """ + # First whether combox is already configured. + config_dir = os.path.join(os.getenv('HOME'),'.combox/') + if not os.path.exists(config_dir): + # Create combox dir and configure. + os.mkdir(config_dir, 0700) + config_file_path = os.path.join(config_dir, 'config.yaml') + config_info = {} + + config_info['combox_dir'] = raw_input('path to combox directory: ') + config_info['topsecret'] = hashlib.sha224(getpass.getpass('passphrase: ')).hexdigest() + + no_nodes = int(raw_input('number of nodes: ')) + + nodes = {} + for i in range(no_nodes): + node_name = raw_input('node %d name: ' % i) + nodes[node_name] = {} + nodes[node_name]['path'] = raw_input('node %d path: ' % i) + nodes[node_name]['size'] = raw_input('node %d size (in mega bytes): ' % i) + nodes[node_name]['available'] = nodes[node_name]['size'] + + config_info['nodes_info'] = nodes + config_file = open(config_file_path, 'w') + yaml.dump(config_info, config_file, default_flow_style=False) + os.chmod(config_file_path,stat.S_IRUSR|stat.S_IWUSR) + else: + # should put something here later + pass diff --git a/combox/crypto.py b/combox/crypto.py @@ -0,0 +1,84 @@ +# Copyright (C) 2014 Combox author(s). See AUTHORS. +# +# This file is part of Combox. +# +# Combox 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. +# +# Combox 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 Combox (see COPYING). If not, see +# <http://www.gnu.org/licenses/>. + +## Adapted from https://gist.github.com/sekondus/4322469 + +import base64 +import os + +from Crypto.Cipher import AES + +BLOCK_SIZE = 32 +PAD_CHAR = '#' + + +def pad(data): + """Pad data such that its length is a multiple of BLOCK_SIZE. + """ + + padding = (BLOCK_SIZE - (len(data) % BLOCK_SIZE)) * PAD_CHAR + data += padding + + return data + + +def encrypt(data, secret): + """Encrypt byestream and return cipher. + """ + aes = AES.new(pad(secret)) + cipher = base64.b64encode(aes.encrypt(pad(data))) + + return cipher + + +def decrypt(cipher, secret): + """Decrypt cipher and return data. + """ + aes = AES.new(pad(secret)) + data = aes.decrypt(base64.b64decode(cipher)).rstrip(PAD_CHAR) + + return data + +def encrypt_shards(shards, secret): + """Encrypt the shards of data and return a list of ciphers. + + shards: list of shards (string, bytes). + secret: top secret passphrase + """ + + ciphers = [] + for shard in shards: + cipher = encrypt(shard, secret) + ciphers.append(cipher) + + return ciphers + + +def decrypt_shards(ciphers, secret): + """Decrypt the ciphered shards and return a list of shards. + + shards: list of ciphered shards. + secret: top secret passphrase + """ + + shards = [] + for cipher in ciphers: + shard = decrypt(cipher, secret) + shards.append(shard) + + return shards