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remail/mail: Handle Outlook GPG plugin proper

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The Outlook GPG plugin works in interesting two variants:

  1) msg.asc or msc.gpg provided as a plain attachement
     without PGP envelope

  2) GpgOL_MIME_structure.txt contains a fully enveloped
     PGP payload with the proper headers.

Of course everything can be base64 encoded and the number of payload
sections is variable as well.

Implement the handling for #2 so it can coexist with the existing
workaround for #1.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2019-11-12 23:46:12 +01:00
parent 8ada1c09b3
commit d7b8db9b96
1 changed files with 32 additions and 18 deletions
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50
remail/mail.py
View file

@ -364,26 +364,40 @@ def msg_sanitize_outlook(msg):
if ct != 'multipart/mixed':
return
# The bogus outlook mails consist of a text/plain and an attachment
payload = msg.get_payload()
if len(payload) != 2:
return
# Try to find the payload part which actually contains the
# magically wrapped outlook GPG data.
# Two variants:
# 1) msg.asc or msc.gpg provided as a plain attachement
# without PGP envelope
# 2) GpgOL_MIME_structure.txt contains a fully enveloped
# PGP payload with the proper headers.
# Of course everything can be base64 encoded as well...
for payload in msg.get_payload():
try:
if payload.get_content_type() != 'application/octet-stream':
continue
if payload[0].get_content_type() != 'text/plain':
return
fname = payload.get_filename(None)
if fname not in ['msg.gpg', 'msg.asc', 'GpgOL_MIME_structure.txt']:
continue
if payload[1].get_content_type() != 'application/octet-stream':
return
fname = payload[1].get_filename(None)
if not fname:
return
if fname not in ['msg.gpg', 'msg.asc', 'GpgOL_MIME_structure.txt']:
return
encpl = payload[1].get_payload()
msg_set_gpg_payload(msg, encpl, 'outlook', addpgp=True)
decode_base64(payload)
encpl = payload.get_payload()
# Check whether the payload is a fully enveloped PGP payload or
# just the unwrapped msg.gpg/asc file.
tmpmsg = message_from_string(encpl)
if tmpmsg.get_content_type() == 'multipart/encrypted':
msg_set_payload(msg, tmpmsg)
else:
msg_set_gpg_payload(msg, encpl, 'outlook', addpgp=True)
return
except:
# If one of the above operations fails badly, just ignore it.
# The unmodified message can either be handled or it will be
# moderated/frozen. The admin has to deal with it anyway. This
# avoids a gazillion of conditionals and checks in the above
# code.
continue
def decode_base64(msg):
#