def hash(plaintext, outputType = '-hex'):
hashKey = None
retval = 0
try:
# name the temporary files randomly
# since the client and server are in the same dir, sometimes
# when both tried to use openSSL simultaneously there were collisions
temp_name = str(uuid.uuid1())
plaintext_file = 'p' + temp_name
key_file = 'k' + temp_name
# write out input / create output files
fileIO.writeFile(plaintext_file, plaintext)
fileIO.writeFile(key_file, '')
# run openssl hash command
retval = subprocess.call(['openssl', 'dgst', '-sha256', outputType, '-out', key_file, plaintext_file])
# read in the output
hashKey = fileIO.readFile(key_file)
finally:
# delete temp files
fileIO.removeFile(plaintext_file)
fileIO.removeFile(key_file)
# return the output
if hashKey is None or retval != 0:
raise Exception('Hash failed')
else:
return hashKey.replace('SHA256(plain.tmp)= ', '', 1)
def storeFiletable(peer_name, dictionary): filetable_name = 'CA/' + peer_name + '/filetable.dat' keyfile = 'CA/' + peer_name + '/' + peer_name + '.key' # If we don't remove the file before rewriting it we get bad decrypts fileIO.removeFile(filetable_name) ciphertext = openSSL.encrypt(keyfile, str(dictionary)) fileIO.writeFile(filetable_name, ciphertext)
def encrypt(keyfile, plaintext):
ciphertext = None
retval = 0
try:
# name the temporary files randomly
# since the client and server are in the same dir, sometimes
# when both tried to use openSSL simultaneously there were collisions
temp_name = str(uuid.uuid1())
plaintext_file = 'p' + temp_name
cipher_file = 'c' + temp_name
# write out input / create output files
fileIO.writeFile(plaintext_file, plaintext)
fileIO.writeFile(cipher_file, '')
# run openssl enc command
with open(keyfile) as f:
retval = subprocess.call(['openssl', 'enc', '-aes-256-cbc', '-a', '-pass', 'stdin', '-out', cipher_file, '-in', plaintext_file], stdin=f)
# read in the output
ciphertext = fileIO.readFile(cipher_file)
finally:
# delete temp files
fileIO.removeFile(plaintext_file)
fileIO.removeFile(cipher_file)
# return the output
if ciphertext is None or retval != 0:
raise Exception('Encrypt failed')
else:
return ciphertext
def storeFile(peer_name, net):
peer_info = net.getPeerInfo()
client_common_name = peer_info[4][0][1]
filename = net.recv()
file_contents = net.recv()
fileIO.writeFile(tmp_file_dir + '/' + filename, file_contents)
os.chdir('refmon')
process = subprocess.Popen(['ocaml', 'RefMon.ml', peer_name, 'execute', client_common_name, 'put', filename], stdout=subprocess.PIPE)
out, err = process.communicate()
os.chdir('..')
net.send(out.decode("utf-8"))
fileIO.removeFile(tmp_file_dir + '/' + filename)
print('Stored', filename, 'for', client_common_name)
def hash(plaintext, outputType):
hashKey = None
retval = 0
try:
# write out input / create output files
fileIO.writeFile('plain.tmp', plaintext)
fileIO.writeFile('key.tmp', "")
# run openssl hash command
retval = subprocess.call(['openssl', 'dgst', '-sha256', outputType, '-out', 'key.tmp', 'plain.tmp'])
# read in the output
hashKey = fileIO.readFile('key.tmp')
finally:
# delete temp files
fileIO.removeFile('plain.tmp')
fileIO.removeFile('key.tmp')
# return the output
if hashKey is None or retval != 0:
raise Exception("hash failed")
else:
return hashKey.replace('SHA256(plain.tmp)= ', '', 1)
def encrypt(key, plaintext):
ciphertext = None
retval = 0
try:
# write out input / create output files
fileIO.writeFile('key.tmp', key)
fileIO.writeFile('plain.tmp', plaintext)
fileIO.writeFile('cipher.tmp', "")
# run openssl enc command
with file('key.tmp') as f:
retval = subprocess.call([
'openssl', 'enc', '-aes-256-cbc', '-pass', 'stdin', '-out',
'cipher.tmp', '-in', 'plain.tmp'
],
stdin=f)
# read in the output
ciphertext = fileIO.readFile('cipher.tmp')
finally:
# delete temp files
fileIO.removeFile('key.tmp')
fileIO.removeFile('plain.tmp')
fileIO.removeFile('cipher.tmp')
# return the output
if ciphertext is None or retval != 0:
raise Exception("encrypt failed")
else:
return ciphertext
def generatePassword():
password = None
retval = 0
try:
# get the current time
time = datetime.now().time()
# write out input / create output files
fileIO.writeFile('rand.tmp', "")
# run openssl rand command
retval = subprocess.call(['openssl', 'rand', '-hex', '-out', 'rand.tmp', '16'])
# read in the output
rand = fileIO.readFile('rand.tmp')
# the password is actually the hash of the current time and random nonce value
password = hash(str(time)+str(rand), '-hex')
finally:
# delete temp files
fileIO.removeFile('rand.tmp')
#return the output
if password is None or retval != 0:
raise Exception("generatePassword failed")
else:
return password
def retrieveFile(peer_name, net):
peer_info = net.getPeerInfo()
client_common_name = peer_info[4][0][1]
filename = net.recv()
os.chdir('refmon')
process = subprocess.Popen(['ocaml', 'RefMon.ml', peer_name, 'execute', client_common_name, 'get', filename], stdout=subprocess.PIPE)
out, err = process.communicate()
os.chdir('..')
result = out.decode("utf-8")
if(result == "Success"):
file_contents = fileIO.readFile(tmp_file_dir + '/' + filename)
net.send(file_contents)
else:
net.send(result)
net.send(result)
fileIO.removeFile(tmp_file_dir + '/' + filename)
print('Retrieved', filename, 'for', client_common_name)
def generatePassword():
password = None
retval = 0
try:
# get the current time
time = datetime.now().time()
# write out input / create output files
fileIO.writeFile('rand.tmp', "")
# run openssl rand command
retval = subprocess.call(
['openssl', 'rand', '-hex', '-out', 'rand.tmp', '16'])
# read in the output
rand = fileIO.readFile('rand.tmp')
# the password is actually the hash of the current time and random nonce value
password = hash(str(time) + str(rand), '-hex')
finally:
# delete temp files
fileIO.removeFile('rand.tmp')
#return the output
if password is None or retval != 0:
raise Exception("generatePassword failed")
else:
return password
def hash(plaintext, outputType):
hashKey = None
retval = 0
try:
# write out input / create output files
fileIO.writeFile('plain.tmp', plaintext)
fileIO.writeFile('key.tmp', "")
# run openssl hash command
retval = subprocess.call([
'openssl', 'dgst', '-sha256', outputType, '-out', 'key.tmp',
'plain.tmp'
])
# read in the output
hashKey = fileIO.readFile('key.tmp')
finally:
# delete temp files
fileIO.removeFile('plain.tmp')
fileIO.removeFile('key.tmp')
# return the output
if hashKey is None or retval != 0:
raise Exception("hash failed")
else:
return hashKey.replace('SHA256(plain.tmp)= ', '', 1)
def encrypt(key, plaintext):
ciphertext = None
retval = 0
try:
# write out input / create output files
fileIO.writeFile('key.tmp', key)
fileIO.writeFile('plain.tmp', plaintext)
fileIO.writeFile('cipher.tmp', "")
# run openssl enc command
with file('key.tmp') as f:
retval = subprocess.call(['openssl', 'enc', '-aes-256-cbc', '-pass', 'stdin', '-out', 'cipher.tmp', '-in', 'plain.tmp'], stdin=f)
# read in the output
ciphertext = fileIO.readFile('cipher.tmp')
finally:
# delete temp files
fileIO.removeFile('key.tmp')
fileIO.removeFile('plain.tmp')
fileIO.removeFile('cipher.tmp')
# return the output
if ciphertext is None or retval != 0:
raise Exception("encrypt failed")
else:
return ciphertext
