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FlowCrypt / flowcrypt-browser

FlowCrypt Browser extension for Chrome and Firefox
https://flowcrypt.com
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Encrypted attachments sent with FlowCrypt cannot be opened on the newest Thunderbird #3278

Open seisvelas opened 3 years ago

seisvelas commented 3 years ago

Newer versions of Thunderbird have built in PGP capabilities. Normal encrypted mail works fine, however file attachments are broken.

When opening the file, it says 'null undefined', which looks like this:

Screenshot from 2020-12-29 02-25-02

And then, when I actually open it:

Screenshot from 2020-12-29 02-26-23

And it's not just me, I learned about this from this support thread: https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgxwKjxHWSvfTzMnjlSkknmltppDt

tomholub commented 3 years ago

Thank you for the report. Is this when sending rich-text (pgp/mime) or an inline pgp message? Can you please export the whole mime message from Thunderbird as text and paste or attach it here?

seisvelas commented 3 years ago

This was without PGP/MIME (I sent it from Chromium, so PGP/MIME was not an option)

Here is the raw message:

Delivered-To: khetyaviles1612@gmail.com
Received: by 2002:a05:6504:134f:0:0:0:0 with SMTP id m15csp9795772ltp;
        Mon, 28 Dec 2020 21:44:19 -0800 (PST)
X-Received: by 2002:a4a:98a3:: with SMTP id a32mr32637412ooj.51.1609220659556;
        Mon, 28 Dec 2020 21:44:19 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; t=1609220659; cv=none;
        d=google.com; s=arc-20160816;
        b=bHAOhNGq+nejXLAVWqj+ef0w8RRM4ROOFilg+RGwsJS6Q6n4YLcQ4AfI7PMGYLI4FE
         bZpYJt1Exgvdd/wXrjIgGZ4oz+9G3itUYLZveZKP2nx5RTpBA+vR/7APotc66Xdn/obJ
         wHJe4zK7GhdopO8CwRDglN6+ihygFqjn1XoO0M7Gdyk1j4IUUbAV1XCSoa8Vg9e73tqH
         kIws4QPQYpG1ofqMCd6czjhCoTisezjDTXQgitN/Ni0Kwegd/S2YH4SZfmZ3F9K/6jkt
         VCQUdFgAkomnsRFEOyLNS/+5KAco9GhR4wplfI7dXZK07AG6fFEqFgEXDAI6ly2/hKhq
         TI1Q==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
        h=to:subject:message-id:date:mime-version:from:openpgp:dkim-signature;
        bh=ZRjaMuHKeSGRTXc1TAcLufOxMG64lOUjbENuvlo0yIQ=;
        b=QPia7rrOao1HRKg+RiEh2OgYKHUkY/hMWbP6IApjn6uhScOYDP9b0CEv7+NzSAPG05
         EqpLnOefACyRWo4dnoYburzhjrQ7GzDkycLtLsMI6Bq9dR387K2VdM3XZ71DQ2AfdtQs
         uAMIW4EgXKORT2KIwWI9RnH4ijGfxYv1J9SpYWz9HrdYGw5NDYPBl7a8V4btwMbQhoiM
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         yNaOE56xIwBunExoz25O4AAaAVvw9H+Omdzvo1LMYvzykdL/Y4lx8Uu42AKhn1E7PCO4
         WfKw==
ARC-Authentication-Results: i=1; mx.google.com;
       dkim=pass header.i=@flowcrypt.com header.s=google header.b=JSLjYVql;
       spf=pass (google.com: domain of alex@flowcrypt.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=alex@flowcrypt.com;
       dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=flowcrypt.com
Return-Path: <alex@flowcrypt.com>
Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41])
        by mx.google.com with SMTPS id b18sor7406991otq.172.2020.12.28.21.44.19
        for <khetyaviles1612@gmail.com>
        (Google Transport Security);
        Mon, 28 Dec 2020 21:44:19 -0800 (PST)
Received-SPF: pass (google.com: domain of alex@flowcrypt.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@flowcrypt.com header.s=google header.b=JSLjYVql;
       spf=pass (google.com: domain of alex@flowcrypt.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=alex@flowcrypt.com;
       dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=flowcrypt.com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=flowcrypt.com; s=google;
        h=openpgp:from:mime-version:date:message-id:subject:to;
        bh=ZRjaMuHKeSGRTXc1TAcLufOxMG64lOUjbENuvlo0yIQ=;
        b=JSLjYVqleNQZRsyjFwOsWTDbypHKkWhc9J3RnWGTH7NB+L6Lv+svAdYqV0x2vgLbt1
         58qnxAWqtVEoBKMmjoofRdQ4pjNh3iickiJJ9JVmMbtq1WOTdvce3jucn2B6VK8obFNC
         SoJJkX6DEQoEZexGe2PCEMAMRngMx0Bb00q3s=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:openpgp:from:mime-version:date:message-id
         :subject:to;
        bh=ZRjaMuHKeSGRTXc1TAcLufOxMG64lOUjbENuvlo0yIQ=;
        b=Ty06EBy+Gj1zUMMLtH91SnOIozSRY94qRCEtCRj+VeCxg2tuH0rpnhWlZAqd6a7I2x
         kGD5xCXZStiaeHyPIIwUOH7bRReL+MHSerlH+kvCYxJOKMzPzesRThTUh8cZLgQ6kf77
         09ZjG2c6AZ7kcJaQ+wOENsa17DtttkUvXs/YLuDbXixyxtbrcXCokxFfxfqlJG3sOvbD
         19l7KN4PYBfMMvnLLJGC1mF4D/L+pQ5DSXkK1PrGZg8qKkU+PrMhpRVGdHRSW8+LIgJH
         KjDJkHpFNdGgenc0PzcjBrIxKhV5q0QfUe0881hN0m6oYV7/tqQYUCTLUXQqR4wdRP96
         JKeQ==
X-Gm-Message-State: AOAM5306dHALRYTrRZGbuzOh/z6jU26zKC4cMYqKu1M6KsFzE1fuqwQL
    Z5OFO18rZ5L6lGUOpS7AhIToVNGSgJtf0YjGKnLeRBVIOCs=
X-Google-Smtp-Source: ABdhPJzRkLqLEJys/muS7QkWDSuKQgth1mFRQZrey+Wi2GeQYcCDNbpGIR6L20Ki6SPfdWVgBnslLfXQCFxwbAUfYiU=
X-Received: by 2002:a9d:4793:: with SMTP id b19mr34247765otf.193.1609220658916;
 Mon, 28 Dec 2020 21:44:18 -0800 (PST)
Received: from 717284730244 named unknown by gmailapi.google.com with
 HTTPREST; Mon, 28 Dec 2020 23:44:17 -0600
Openpgp: id=BD0636F1589AD798
From: Alejandro Alvarado <alex@flowcrypt.com>
MIME-Version: 1.0
Date: Mon, 28 Dec 2020 23:44:17 -0600
Message-ID: <CAAVtiawdPXuViV_3AeGGYp4oDv6E-5GJsBusGJZ8LwTxOT3eZg@mail.gmail.com>
Subject: Encrypted attachment test for Enigmail
To: Khety Aviles <khetyaviles1612@gmail.com>
Content-Type: multipart/mixed; boundary="000000000000bdb85b05b793e1f7"

--000000000000bdb85b05b793e1f7
Content-Type: text/plain; charset="UTF-8"

-----BEGIN PGP MESSAGE-----
Version: FlowCrypt Email Encryption 8.0.0
Comment: Seamlessly send and receive encrypted email

wcFMA+nCMbB4KnKWAQ//aH95J+PWQQgemg52A5DvgPWCDW1p9EsUcJA/5uxA
xfRLhvXnaOqTsff0aKpLBRasUiJPwbhJ6m/R3RC4+byjJZdemJcZUXjVwOm/
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LSCyArV045PlnTeLVDgWK18jup0VCof+xYgZWpOeuwK87VYzIErSYwFyWF/L
MzybAFd4DIbR+lhKexc4L7vlbKMqd+wKxTzw6twa4pUhDl1TrD97M0RUl3AU
Vy7KZ/tJdlmnUx0BjdUEzhzzdSTUk1fEyN6sER+/gBQObsErbKjNIZSnsHxp
nlHzJg==
=/198
-----END PGP MESSAGE-----

--000000000000bdb85b05b793e1f7
Content-Type: application/octet-stream; name="please.c.pgp"
Content-Disposition: attachment; filename="please.c.pgp"
Content-Transfer-Encoding: base64
Content-ID: <f_UPgckYHbRvOwyOrQsbWhJcmxrtrcaS@flowcrypt>
X-Attachment-Id: f_UPgckYHbRvOwyOrQsbWhJcmxrtrcaS@flowcrypt

wcFMA+nCMbB4KnKWAQ//chgfHS/Q0p778+q04kkO6xWzimOIA7H4KRX6F/qWOH8Bb836eL/TIhpl
LXe4w+VPK1sKFuVY4mH02hDRd9wrIXY1h+Ir++UdztopISZ1rD0qYrrFDwUU5ixge0lpfCMLhIFp
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tomholub commented 3 years ago

I'm assigning bilal to later have a look at what causes this.

fleish commented 3 years ago

I can open a separate issue if needed, but this also seems to reveal an issue with the way Flowcrypt handles attachments. By adding them on as separately encrypted files and then appending them to the rest of the PGP-signed message it causes issues with recipients who do receive it to show the message as "partly signed" since the encrypted attachments are not signed.

It also seems to cause the messages to bounce when received by a Schleuder encrypted list that enforces messages received are signed & encrypted by a subscriber due to the message not being properly signed.

Is this something that can be addressed with existing settings to change how the attachments are handled by Flowcrypt or will it require updated code?

tomholub commented 3 years ago

Unfortunetely what you are asking for likely requires PGP/MIME which we have implemented but it doesn't work because of how Gmail API mangles up outgoing messages. If you want to give it a try, install Firefox extension instead and then you'll see an option to send a rich-text message. That should also encrypt and sign the attachment as part of the body. However, the sent message will not conform to PGP/MIME standard fully because of how Gmail messes it up, so it may or may not be understood as an OpenPGP message on the receiving end. Worth a try though.

We are talking to Google to get this resolved but they are taking ages.

fleish commented 3 years ago
Screen Shot 2021-06-30 at 13 00 58 Screen Shot 2021-06-30 at 13 00 36

Thanks for the quick reply, but yeah the results are also wonky using PGP/MIME in the Firefox plugin too. Ironically, the resulting message ends up being fully signed but partly encrypted See attached screenshots for what I received on the far end in macOS Mail.app + GPGTools/GPGMail

tomholub commented 3 years ago

yes - probably the result of gmail api mangling. unfortunately we can’t improve this until gmail google fixes this.

On Wednesday, June 30, 2021, fleish @.***> wrote:

[image: Screen Shot 2021-06-30 at 13 00 58] https://user-images.githubusercontent.com/2106430/124023821-44142680-d9a3-11eb-8410-3cbdd7a467e8.png

[image: Screen Shot 2021-06-30 at 13 00 36] https://user-images.githubusercontent.com/2106430/124023823-45455380-d9a3-11eb-89fc-8eec35b25371.png

Thanks for the quick reply, but yeah the results are also wonky using PGP/MIME in the Firefox plugin too. Ironically, the resulting message ends up being fully signed but partly encrypted See attached screenshots for what I received on the far end in macOS Mail.app + GPGTools/GPGMail

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/FlowCrypt/flowcrypt-browser/issues/3278#issuecomment-871691142, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQDZEKO6DRWJ2TNYDKIQXDTVN2EHANCNFSM4VM774YA .

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rrrooommmaaa commented 3 years ago

Is this actionable now?

tomholub commented 3 years ago

Yes - please try to send a pgp message that does is pgp/inline with separate encrypted attachment files, and open in Thunderbird.

This flow is unaffected by Gmail API bug but based on the description of this issue, still doesn't work when opening.

Please triage the issue to confirm you can reproduce it and if yes, see what may be the problem.

rrrooommmaaa commented 3 years ago

I tried with Thunderbird 78.12.0 and was able to reproduce the error, but it had something to do with file extension rather than message format error. Make sure Thunderbird opens plain "C" file (you can save this mapping from the plain file open dialogue only, I guess) image After that, the encrypted file will open (simultaneously with the pop-up dialogue) on double-clicking this icon image Opening the file from the pop-up dialogue will open it in raw encrypted form, so don't do that unless you want to save it for later decryption image

rrrooommmaaa commented 3 years ago

This is the message I tested it with

Received: from 717284730244
    named unknown
    by gmailapi.google.com
    with HTTPREST;
    Wed, 21 Jul 2021 01:44:08 -0700
Content-Type: multipart/mixed;
 boundary="----sinikael-?=_1-16268570479440.10164582326062122"
Openpgp: id=07481C8ACF9D49FE
From: Gmail CI Test <ci.tests.gmail@flowcrypt.dev>
To: Gmail CI Test <ci.tests.gmail@flowcrypt.dev>
Subject: try with the latest version
Date: Wed, 21 Jul 2021 01:44:08 -0700
Message-Id: <CAO9FY9uqW3ESKpQwiP8-2mFEEXK5SvtqDLri6PFasK5Lv6be3w@mail.gmail.com>
MIME-Version: 1.0

------sinikael-?=_1-16268570479440.10164582326062122
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

-----BEGIN PGP MESSAGE-----
Version: FlowCrypt Email Encryption 8.1.1
Comment: Seamlessly send and receive encrypted email

wV4DeWfgCtVtdnoSAQdAwRWLrLllmFVxS+2awcN41qwozbGiNrMnFFA73nYw
WQMwFZ/94uk/fLThcs6ap9MHomTvJIgcIm4/u6LjuEEo/EUpfCEtwWrQ4UUX
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/l9V2swMa9yuEl1oO2cEC3a2M7jY/vZtuPX990qYDI4zPZa8
=3DcGgg
-----END PGP MESSAGE-----

------sinikael-?=_1-16268570479440.10164582326062122
Content-Type: application/octet-stream; name=please.c.pgp
Content-Disposition: attachment; filename=please.c.pgp
X-Attachment-Id: f_uCrAyGVbjxXoCeYYwsTCXpGCbQIFug@flowcrypt
Content-Id: <f_uCrAyGVbjxXoCeYYwsTCXpGCbQIFug@flowcrypt>
Content-Transfer-Encoding: base64

wV4DeWfgCtVtdnoSAQdAHU7lJ9aasrvBvxGTumOc/q1m6L81kpbj3NFxc7MOJ1IwRlql7JqoofNL
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------sinikael-?=_1-16268570479440.10164582326062122--
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tomholub commented 3 years ago

Opening the file from the pop-up dialogue will open it in raw encrypted form, so don't do that unless you want to save it for later decryption

Could Thunderbird be convinced somehow to recognize this as an encrypted file? Do you think it's a bug on their end, or something we could do (like a application/pgp-encrypted header?)

rrrooommmaaa commented 3 years ago

Could Thunderbird be convinced somehow to recognize this as an encrypted file? Do you think it's a bug on their end, or something we could do (like a application/pgp-encrypted header?)

It does decrypt it on double-click, so it recognizes it. It just saves the original encrypted file from the dialogue.

rrrooommmaaa commented 3 years ago

Or, perhaps, the "null undefined" may be connected with missing OpenPGP key for decryption. I'm seeing this when trying to double-click on a file when having this red strip. image There is certainly a bug in Thunderbird printing such an undescriptive message, The only way the error may appear without the red strip (by our fault), is when the message body and the attachment are encrypted with different (sets of) keys. I'll add a test to check this.

tomholub commented 3 years ago

When you send a message with Thunderbird itself that contains attachment, and then try to open it, does it make you jump through the same hoops?

rrrooommmaaa commented 3 years ago

When you send a message with Thunderbird itself that contains attachment, and then try to open it, does it make you jump through the same hoops?

Nope, Thunderbird uses multipart/encrypted OpenPGP/MIME format. And it is handled properly by both Thunderbird and Flowcrypt.

rrrooommmaaa commented 3 years ago

It is still possible to open the file in our workaround format when encrypted to a single recipient. Would you like me to do more tests with multiple keys/recipients, @tomholub ?

tomholub commented 3 years ago

I suppose this is more of a bug in thunderbird then our own software. you could try reporting it in their project.

last thing too they would be if they recognise our pgp/mime format. that would be interesting to know. otherwise i think we can close this. thank you for looking into it!

On Wednesday, July 21, 2021, Roman @.***> wrote:

It is still possible to open the file in our workaround format when encrypted to a single recipient. Would you like me to do more tests with multiple keys/recipients, @tomholub https://github.com/tomholub ?

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/FlowCrypt/flowcrypt-browser/issues/3278#issuecomment-884373225, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABQDZEJVESTACNKQY5WBF7TTY4BYDANCNFSM4VM774YA .

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