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remail/mail: Handle dwmw2s magic evo plugin
dwmw2's evolution plugin which seems to workaround ms-exchange oddities has another interesting format not handled by remail yet: multipart/mixed with: - empty text/plain section - application/pgp-encrypted - application/octed-stream Check for this with at least some sanity checks and morph it into a regular multipart/encrypted message so decrypt can handle it without adding more mess to that part. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -402,6 +402,56 @@ def msg_sanitize_outlook(msg):
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# code.
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continue
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def msg_handle_multimix(msg):
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'''
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Magic format used by dwmw2's devolution plugin to prevent
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exchange from wreckaging mail. It's kinda valid, but sigh...
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Multipart mixed message with:
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- empty text/plain
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- application/pgp-encrypted
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- application/octed-stream
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Make it look like a sane PGP application/encrypted mail
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'''
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ct = msg.get_content_type()
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if ct != 'multipart/mixed':
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return
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fnames = ['msg.asc', 'encrypted.asc']
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gpgpl = 0
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otherpl = []
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payloads = msg.get_payload()
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for payload in payloads:
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try:
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ct = payload.get_content_type()
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print(ct)
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if ct == 'application/pgp-encrypted':
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gpgpl += 1
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continue
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elif ct == 'application/octet-stream':
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fname = payload.get_filename(None)
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if gpgpl == 1 and fname in fnames:
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gpgpl += 1
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continue
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# None of the above. Mark it as other
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otherpl.append(payload)
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except:
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# Ignore fails here. This is all best effort
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# guesswork.
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pass
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if gpgpl != 2:
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return
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# Remove the irrelevant payload parts
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for pl in otherpl:
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payloads.remove(pl)
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# Fixup the message type so decrypt knows what to do with it
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msg.set_type('multipart/encrypted')
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msg.set_param('protocol', 'application/pgp-encrypted')
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def decode_base64(msg):
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#
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# Decode base64 encoded text/plain sections
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@ -436,6 +486,9 @@ def msg_sanitize_incoming(msg):
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# Strip html multipart first
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msg_strip_html(msg)
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# Handle multipart/mixed
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msg_handle_multimix(msg)
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# Sanitize outlook crappola
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msg_sanitize_outlook(msg)
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