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compression, argparse

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dash
2017-05-29 13:00:51 +02:00
parent 23952703c5
commit b07dee4cfe
4 changed files with 233 additions and 260 deletions
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66
README.md
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@@ -21,23 +21,55 @@ virtualenv .
source bin/activate
pip install -r requirements.txt
```
# Fork()
## Usage
pgpfs is simple to use. It is able to both `store` and `fetch` documents from
the keyserver. Here are examples of usage:
Patched pgpfs code from https://github.com/aestetix/pgpfs.
Has now:
### `store`
To store the file sample.mp3 and save the Key Allocation Table (kat) in
sample.kat, run:
```
python pgpfs.py store sample.mp3 sample.kat
```
This will create a file called sample.kat to be used when you want to retrieve
your file.
- argparse
- compression / decompression
### `fetch`
To fetch the file sample.mp3 from the keyserver, assuming the kat file is called
sample.kat, run:
```
python pgpfs.py fetch sample.kat sample.mp3
```
# TODO
- add threading
- add encryption
# TODO for someone with time and skills
- Building an vfs based on pgpfs, implementation ideas welcome :)
# USAGE
./pgpfs.py -h
usage: pgpfs.py [-h] -a ACTION [-k KAT] [-s STORE] [--keyserver KEYSERVER]
[--pgpfspath PGPFSPATH] [--gpgbinary PGPFSBIN]
https://github.com/aestetix/pgpfs
optional arguments:
-h, --help show this help message and exit
-a ACTION, --action ACTION
action to do: store or fetch
-k KAT, --katfile KAT
if fetch specify KAT file
-s STORE, --storefile STORE
if store specify file for upload
--keyserver KEYSERVER
specify keyserver
--pgpfspath PGPFSPATH
specify path for pgpfs
--gpgbinary PGPFSBIN specify path for pgpfs binary(patched gpg bin)
# Upload
./pgpfs.py -a store -s somefile.ext -k somefile.kat
# Download
./pgpfs.py -a store -s example.gif -k sample.kat
# NOTE
Please note that you need the gpg patched code from here:
https://github.com/aestetix/gpg
Compile and place somewhere. Adjust --gpgbinary accoringly.
Also you need to run an entropy source:
rndg -r /dev/urandom

119
pgpfs.py
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@@ -1,23 +1,59 @@
#!bin/python
#!/usr/bin/env python2
#
# watch out, this is only possible with modified gpg version
# download this version as well from aestetix repo
""" pgpfs is a tool to turn your friendly pgp keyserver into a redundant
persistant filesystem."""
import re
import os
import sys
import re
import base64
from hashlib import sha256
import gnupg
import base64
import pylzma
import argparse
import threading
os.system('rm -rf gpg')
GPG = gnupg.GPG(gnupghome='gpg')
KEYSERVER = 'pgp.mit.edu'
from hashlib import sha256
# TODO adjust with pgpfspath
os.system('rm -fr .pgpfs')
# trial and error lead to this number
SPLIT_LENGTH = 986
# store file
# pack file
def pack_file_to_disk(source_file):
''' takes the file and packs it '''
print 'Compressing file'
# TODO gen random temp here
target_file='tempfile.tmp'
with open(source_file, 'r') as source, open(target_file,'wb') as target:
lz = pylzma.compressfile(source, eos=1)
while True:
b =lz.read(1)
if not b:
break
target.write(b)
target.close()
return target_file
def unpack_file_from_disk(packed_file, out_file):
''' unpack file '''
print 'Uncompressing file'
with open(packed_file, 'rb') as packed, open(out_file,'wb') as out:
obj = pylzma.decompressobj()
decompress = ''
while True:
b = packed.read(1)
if not b:
break
dec = obj.decompress(b)
out.write(dec)
return True
# store file
def read_file_into_list(source_file):
""" reads file into list"""
with open(source_file, 'r') as source:
@@ -54,6 +90,10 @@ def send_key(key_id):
def store_file(filename1, filename2):
""" overall function to upload file to keyserver"""
print 'Splitting ', filename1, ' into encoded comments for keys'
# watch out return value is the name of the newly packed file now
filename1 = pack_file_to_disk(filename1)
file_list = read_file_into_list(filename1)
output_file = open(filename2, 'w')
counter_length = len(file_list)
@@ -63,9 +103,14 @@ def store_file(filename1, filename2):
counter = counter + 1
key_id = create_key(chunk)
output_file.write(send_key(key_id)+'\n')
output_file.flush()
print '--> key has been created and uploaded'
print 'File has been successfully uploaded to ', KEYSERVER
# TODO adjust with args
# tempfile is created at packing stage
os.system('tempfile.tmp')
# fetch file
def get_key_comment(key_id):
@@ -82,8 +127,9 @@ def parse_key(key_id):
def fetch_file(index_file, filename):
""" overall function to fetch component file parts from keyserver"""
with open(index_file, 'r') as index, open(filename, 'w+') as download:
print 'Fetching keys from ', KEYSERVER, ' to create ', filename
filelzma='%s.lzma' % filename
with open(index_file, 'r') as index, open(filelzma, 'w+') as download:
print 'Fetching keys from ', KEYSERVER, ' to create ', filelzma
fetched_file = ''
index_length = len(index.readlines())
index.seek(0) # because python is stupid
@@ -94,11 +140,16 @@ def fetch_file(index_file, filename):
fetched_file = fetched_file + parse_key(key.rstrip('\n'))
print 'All keys have been downloaded'
download.write(base64.b64decode(fetched_file))
# hook in here and unpack the data
# filename == original outname
# filelzma == packed file here as download
unpack_file_from_disk(filelzma,filename)
print 'File has been decoded and saved as ', filename
# handle command line input
# remove lzma
os.unlink(filelzma)
if len(sys.argv) < 3:
def usage():
print """Usage: ./pgpfs.py [action] filename1 filename2'
action can be either ''store'' or ''fetch'''
@@ -115,13 +166,45 @@ if len(sys.argv) < 3:
"""
sys.exit(0)
ACTION = sys.argv[1]
def run(args):
''' run function, do all the magic '''
if ACTION not in ['store', 'fetch']:
global KEYSERVER
global GPG
pgpfspath = args.pgpfspath
pgpfsbin = args.pgpfsbin
KEYSERVER = args.keyserver
ACTION = args.action
kat = args.kat
store = args.store
GPG = gnupg.GPG(gnupghome=pgpfspath,gpgbinary=pgpfsbin)
if ACTION not in ['store', 'fetch']:
print 'Please specific either ''store'' or ''fetch'''
sys.exit(0)
if ACTION == 'store':
store_file(sys.argv[2], sys.argv[3])
elif ACTION == 'fetch':
fetch_file(sys.argv[2], sys.argv[3])
if ACTION == 'store':
store_file(store, kat)
elif ACTION == 'fetch':
fetch_file(kat, store)
pass
def main():
prog_name='pgpfs.py'
prog_desc='https://github.com/aestetix/pgpfs'
parser = argparse.ArgumentParser(prog=prog_name, description=prog_desc)
parser.add_argument('-a','--action',help='action to do: store or fetch',dest='action',required=True)
parser.add_argument('-k','--katfile',help='if fetch specify KAT file',dest='kat',required=False)
parser.add_argument('-s','--storefile',help='if store specify file for upload',dest='store',required=False)
parser.add_argument('--keyserver',help='specify keyserver',dest='keyserver',required=False, default='pgp.mit.edu')
parser.add_argument('--pgpfspath',help='specify path for pgpfs',dest='pgpfspath',required=False, default='.pgpfs')
parser.add_argument('--gpgbinary',help='specify path for pgpfs binary(patched gpg bin)',dest='pgpfsbin',required=False, default='/root/fuzzygpg/bin/gpg2')
args = parser.parse_args()
run(args)
if __name__ == '__main__':
main()

4
requirements.txt
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@@ -1 +1,5 @@
# for crypto
python-gnupg
# for compression
pip2 install pylzma

158
sample.kat
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@@ -1,152 +1,6 @@
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