[bug] encode pgp/mime parts as 7bit encoding

We were encoding some parts as base64 and others with our manual
encoders. Let's not do base64 and use the email standard library
encoders instead.

- Resolves: #8957

2 files changed, 8 insertions, 4 deletions

diff --git a/src/leap/bitmask/mail/outgoing/service.py b/src/leap/bitmask/mail/outgoing/service.py
index a3b8d00..86fb63c 100644
--- a/src/leap/bitmask/mail/outgoing/service.py
+++ b/src/leap/bitmask/mail/outgoing/service.py
@@ -26,6 +26,7 @@ import re
 from StringIO import StringIO
 from copy import deepcopy
 from email.parser import Parser
+from email.encoders import encode_7or8bit
 from email.mime.application import MIMEApplication
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
@@ -385,7 +386,7 @@ class OutgoingMail(object):
         def create_encrypted_message(res):
             newmsg, encstr = res
             encmsg = MIMEApplication(
-                encstr, _subtype='octet-stream', _encoder=lambda x: x)
+                encstr, _subtype='octet-stream', _encoder=encode_7or8bit)
             encmsg.add_header('content-disposition', 'attachment',
                               filename='msg.asc')
             # create meta message
diff --git a/src/leap/bitmask/mail/rfc3156.py b/src/leap/bitmask/mail/rfc3156.py
index cb59268..7f719f6 100644
--- a/src/leap/bitmask/mail/rfc3156.py
+++ b/src/leap/bitmask/mail/rfc3156.py
@@ -24,6 +24,7 @@ from StringIO import StringIO
 
 from twisted.logger import Logger
 
+from email.encoders import encode_7or8bit
 from email.mime.application import MIMEApplication
 from email.mime.multipart import MIMEMultipart
 from email import errors
@@ -361,7 +362,8 @@ class PGPEncrypted(MIMEApplication):
 
     def __init__(self, version=1):
         data = "Version: %d" % version
-        MIMEApplication.__init__(self, data, 'pgp-encrypted')
+        MIMEApplication.__init__(self, data, 'pgp-encrypted',
+                                 _encoder=encode_7or8bit)
 
 
 class PGPSignature(MIMEApplication):
@@ -375,7 +377,7 @@ class PGPSignature(MIMEApplication):
     """
     def __init__(self, _data, name='signature.asc'):
         MIMEApplication.__init__(self, _data, 'pgp-signature',
-                                 _encoder=lambda x: x, name=name)
+                                 _encoder=encode_7or8bit, name=name)
         self.add_header('Content-Description', 'OpenPGP Digital Signature')
 
 
@@ -390,4 +392,5 @@ class PGPKeys(MIMEApplication):
     """
 
     def __init__(self, _data):
-        MIMEApplication.__init__(self, _data, 'pgp-keys')
+        MIMEApplication.__init__(self, _data, 'pgp-keys',
+                                 _encoder=encode_7or8bit)