Merge pull request 'feat: Add cache encryption' (#9) from lash/encrypt into master

Reviewed-on: #9

CHANGELOG

@@ -1,3 +1,5 @@
+- 0.0.6
+	* Add cache encryption, with AES-CTR-128
 - 0.0.5
 	* Replace logs with colorized progress output on default loglevel
 	* Do not repeat already failed metadata lookups

clicada/cli/arg.py

@@ -1,7 +1,7 @@
 # import notifier
 from clicada.cli.notify import NotifyWriter
 notifier = NotifyWriter()
-notifier.notify('loading script')
+#notifier.notify('loading script')
 
 # standard imports
 import os
@@ -22,6 +22,7 @@ from clicada.cli.http import (
         HTTPSession,
         PGPClientSession,
         )
+from clicada.crypt.aes import AESCTREncrypt
 
 logg = logging.getLogger()
 
@@ -150,6 +151,7 @@ class CmdCtrl:
         auth_db_path = self.get('AUTH_DB_PATH', default_auth_db_path)
         self.__auth = PGPAuthCrypt(auth_db_path, self.get('AUTH_KEY'), self.get('AUTH_KEYRING_PATH'))
         self.__auth.get_secret(self.get('AUTH_PASSPHRASE'))
+        self.encrypter = AESCTREncrypt(auth_db_path, self.__auth.secret)
 
 
     def get(self, k, default=None):

clicada/cli/auth.py

@@ -26,6 +26,7 @@ class PGPAuthCrypt:
             raise AuthError('invalid key {}'.format(auth_key))
         self.auth_key = auth_key
         self.gpg = gnupg.GPG(gnupghome=pgp_dir)
+        self.secret = None
 
 
     def get_secret(self, passphrase=''):
@@ -49,10 +50,11 @@ class PGPAuthCrypt:
             f.write(secret.data)
             f.close()
             f = open(p, 'rb')
-        self.secret = self.gpg.decrypt_file(f, passphrase=passphrase)
-        if not self.secret.ok:
+        secret = self.gpg.decrypt_file(f, passphrase=passphrase)
+        if not secret.ok:
             raise AuthError('could not decrypt encryption secret. wrong password?')
         f.close()
+        self.secret = secret.data
         self.__passphrase = passphrase
 
 

clicada/cli/http.py

@@ -3,6 +3,7 @@ import hashlib
 import urllib.parse
 import os
 import logging
+from socket import getservbyname
 
 # external imports
 from usumbufu.client.base import (
@@ -48,7 +49,15 @@ class HTTPSession:
     def __init__(self, url, auth=None, origin=None):
         self.base_url = url
         url_parts = urllib.parse.urlsplit(self.base_url)
-        url_parts_origin = (url_parts[0], url_parts[1], '', '', '',)
+        url_parts_origin_host = url_parts[1].split(":")
+        host = url_parts_origin_host[0]
+        try:
+            host = host + ':' + url_parts_origin_host[1]
+        except IndexError:
+            host = host + ':' + str(getservbyname(url_parts[0]))
+            logg.info('changed origin with missing port number from {} to {}'.format(url_parts[1], host))
+        url_parts_origin = (url_parts[0], host, '', '', '',)
+            
         self.origin = origin
         if self.origin == None:
             self.origin = urllib.parse.urlunsplit(url_parts_origin)

clicada/cli/notify.py

@@ -1,12 +1,13 @@
 # standard imports
 import os
 import sys
+import shutil
 
 
 class NotifyWriter:
 
     def __init__(self, writer=sys.stdout):
-        (c, r) = os.get_terminal_size()
+        (c, r) = shutil.get_terminal_size()
         self.cols = c
         self.fmt = "\r{:" + "<{}".format(c) + "}"
         self.w = writer

clicada/cli/user.py

@@ -56,7 +56,7 @@ def execute(ctrl):
 
     store_path = '.clicada'
     user_phone_file_label = 'phone'
-    user_phone_store = FileUserStore(ctrl.opener('meta'), ctrl.chain(), user_phone_file_label, store_path, int(ctrl.get('FILESTORE_TTL')))
+    user_phone_store = FileUserStore(ctrl.opener('meta'), ctrl.chain(), user_phone_file_label, store_path, int(ctrl.get('FILESTORE_TTL')), encrypter=ctrl.encrypter)
 
     ctrl.notify('resolving identifier {} to wallet address'.format(ctrl.get('_IDENTIFIER')))
     user_address = user_phone_store.by_phone(ctrl.get('_IDENTIFIER'), update=ctrl.get('_FORCE'))
@@ -78,7 +78,7 @@ def execute(ctrl):
     token_store = FileTokenStore(ctrl.chain(), ctrl.conn(), 'token', store_path)
 
     user_address_file_label = 'address'
-    user_address_store = FileUserStore(ctrl.opener('meta'), ctrl.chain(), user_address_file_label, store_path, int(ctrl.get('FILESTORE_TTL')))
+    user_address_store = FileUserStore(ctrl.opener('meta'), ctrl.chain(), user_address_file_label, store_path, int(ctrl.get('FILESTORE_TTL')), encrypter=ctrl.encrypter)
 
     ctrl.notify('resolving metadata for address {}'.format(user_address_normal))
     try:

clicada/crypt/aes.py

@@ -0,0 +1,42 @@
+# standard imports
+import os
+import logging
+import hashlib
+
+from Crypto.Cipher import AES
+from Crypto.Util import Counter
+
+from .base import Encrypter
+
+logg = logging.getLogger(__name__)
+
+
+class AESCTREncrypt(Encrypter):
+
+    aes_block_size = 1 << 7
+    counter_bytes = int(128 / 8)
+
+    def __init__(self, db_dir, secret):
+        self.secret = secret
+
+
+    def key_to_iv(self, k):
+        h = hashlib.sha256()
+        h.update(k.encode('utf-8'))
+        h.update(self.secret)
+        z = h.digest()
+        return int.from_bytes(z[:self.counter_bytes], 'big') 
+
+
+    def encrypt(self, k, v):
+        iv = self.key_to_iv(k)
+        ctr = Counter.new(self.aes_block_size, initial_value=iv)
+        cipher = AES.new(self.secret, AES.MODE_CTR, counter=ctr)
+        return cipher.encrypt(v)
+       
+
+    def decrypt(self, k, v):
+        iv = self.key_to_iv(k)
+        ctr = Counter.new(self.aes_block_size, initial_value=iv)
+        cipher = AES.new(self.secret, AES.MODE_CTR, counter=ctr)
+        return cipher.decrypt(v)

clicada/crypt/base.py

@@ -0,0 +1,8 @@
+class Encrypter:
+    
+    def encrypt(self, v):
+        raise NotImplementedError()
+
+
+    def decrypt(self, v):
+        raise NotImplementedError()

clicada/user/file.py

@@ -65,7 +65,7 @@ class Account(Person):
 
 class FileUserStore:
 
-    def __init__(self, metadata_opener, chain_spec, label, store_base_path, ttl):
+    def __init__(self, metadata_opener, chain_spec, label, store_base_path, ttl, encrypter=None):
         invalidate_before = datetime.datetime.now() - datetime.timedelta(seconds=ttl)
         self.invalidate_before = int(invalidate_before.timestamp())
         self.have_xattr = False
@@ -82,6 +82,7 @@ class FileUserStore:
         self.__validate_dir()
         self.metadata_opener = metadata_opener
         self.failed_entities = {}
+        self.encrypter = encrypter
 
 
     def __validate_dir(self):
@@ -108,8 +109,14 @@ class FileUserStore:
         if have_file and not its_time and not force:
             raise FileExistsError('user resolution already exists for {}'.format(k))
 
-        f = open(p, 'w')
-        f.write(v)
+        ve = v
+        f = None
+        if self.encrypter != None:
+            ve = self.encrypter.encrypt(k, ve.encode('utf-8'))
+            f = open(p, 'wb')
+        else:
+            f = open(p, 'w')
+        f.write(ve)
         f.close()
 
         logg.info('added user store {} record {} -> {}'.format(self.label, k, v))
@@ -174,12 +181,21 @@ class FileUserStore:
                 self.__unstick(p)
         self.check_expiry(p)
 
-        f = open(p, 'r')
-        r = f.read()
+        f = None
+        if self.encrypter != None:
+            f = open(p, 'rb')
+        else:
+            f = open(p, 'r')
+        v = f.read()
         f.close()
 
+        if self.encrypter != None:
+            v = self.encrypter.decrypt(k, v)
+            logg.debug('>>>>>>>>>>>>< v decoded {}'.format(v))
+            v = v.decode('utf-8')
+
         logg.debug('retrieved {} from {}'.format(k, p))
-        return r.strip()
+        return v.strip()
 
 
     def by_phone(self, phone, update=False):

requirements.txt

@@ -1,7 +1,10 @@
-usumbufu~=0.3.4
-confini~=0.5.1
+usumbufu~=0.3.5
+confini~=0.5.3
 cic-eth-registry~=0.6.1
 cic-types~=0.2.1a8
 phonenumbers==8.12.12
 eth-erc20~=0.1.2
 hexathon~=0.1.0
+pycryptodome~=3.10.1
+chainlib-eth~=0.0.21
+chainlib~=0.0.17

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = clicada
-version = 0.0.5a1
+version = 0.0.6a2
 description = CLI CRM tool for the cic-stack custodial wallet system
 author = Louis Holbrook
 author_email = dev@holbrook.no
@@ -34,3 +34,4 @@ packages =
 	clicada.cli
 	clicada.tx
 	clicada.user
+	clicada.crypt