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Subject: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
Resent-From: Daniel Kahn Gillmor <dkg@HIDDEN>
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Date: Thu, 15 May 2025 23:56:25 -0400
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Package: emacs,gnus
Version: 30.1

I'm running emacs 30.1 on debian.  When sending cleartext mail, i want
to be able to produce an "Unobtrusive Signature" using OpenPGP as
described in
https://datatracker.ietf.org/doc/draft-gallagher-email-unobtrusive-signatures/

Those kinds of signatures provide end-to-end cryptographic protection
for headers (based on
https://datatracker.ietf.org/doc/draft-ietf-lamps-header-protection/ )
as well as the message body, and are less likely to inflict bad UX or
bad rendering on recipients using legacy MUAs compared to PGP/MIME (or
inline PGP, for that matter).

These three patches appear to do the trick for me.  I'm not an elisp
guru or a gnus expert.  I'm happy to hear any feedback about how they
could be improved.

Regards,

        --dkg


--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline;
 filename=0001-mml-Pass-likely-headers-through-to-mml-sec-functions.patch
Content-Transfer-Encoding: quoted-printable

From=2081c3e7f5de0bbb24bbd2a2b43a103fb83c530f6d Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@HIDDEN>
Date: Thu, 15 May 2025 21:49:32 -0400
Subject: [PATCH 1/3] mml: Pass likely headers through to mml-sec functions

By pre-computing the likely headers for an outbound message, and passing
them along as a tag in mml-parse, we create an opportunity to provide
Header Protection as described in
https://datatracker.ietf.org/doc/draft-ietf-lamps-header-protection/

Signed-off-by: Daniel Kahn Gillmor <dkg@HIDDEN>
=2D--
 lisp/gnus/mml.el | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lisp/gnus/mml.el b/lisp/gnus/mml.el
index 51d8d2c3769..11a8de7c011 100644
=2D-- a/lisp/gnus/mml.el
+++ b/lisp/gnus/mml.el
@@ -265,6 +265,8 @@ part.  This is for the internal use, you should never m=
odify the value.")
 	  (apply #'mml-insert-tag
 		 secure-mode
 		 `(,@tags
+                   ,"likely-headers"
+                   ,(mml-get-likely-headers)
 		   ,(if keyfile "keyfile")
 		   ,keyfile
 		   ,@(apply #'append
@@ -492,6 +494,21 @@ If MML is non-nil, return the buffer up till the corre=
spondent mml tag."
 (declare-function libxml-parse-html-region "xml.c"
 		  (start end &optional base-url discard-comments))
=20
+(defun mml-get-likely-headers ()
+  "Get likely final headers from the existing message"
+  (save-excursion
+    (save-restriction
+      (message-narrow-to-headers-or-head)
+      (let ((x (buffer-substring (point-min) (point-max))))
+        (with-temp-buffer
+          (insert x)
+          (message-remove-header "Bcc")
+          (message-remove-header message-ignored-mail-headers t)
+          (mail-encode-encoded-word-buffer)
+          (message-cleanup-headers)
+          (buffer-string)
+          )))))
+
 (defun mml-generate-mime (&optional multipart-type content-type)
   "Generate a MIME message based on the current MML document.
 MULTIPART-TYPE defaults to \"mixed\", but can also
=2D-=20
2.47.2


--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline;
 filename=0002-mml-Enable-production-of-Unobtrusive-Signatures-via-.patch
Content-Transfer-Encoding: quoted-printable

From=2075f8c5c936deafea1ee44edad5e0f530ec6c4dfc Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@HIDDEN>
Date: Thu, 15 May 2025 21:54:06 -0400
Subject: [PATCH 2/3] mml: Enable production of Unobtrusive Signatures via e=
pg

https://datatracker.ietf.org/doc/draft-gallagher-email-invisible-signatures/
describes a mechanism to produce cleartext signatures over MIME messages
that are less likely to cause problems than traditional PGP/MIME.

With this patch, it's possible to produce those signatures with:

   (mml-secure-message "unobtrusive" 'sign)

This patch only works with epg, not with mailcrypt or pgg, because epg
is what i'm familiar with and what i can easily test.

Signed-off-by: Daniel Kahn Gillmor <dkg@HIDDEN>
=2D--
 lisp/gnus/mml-sec.el |  6 ++++++
 lisp/gnus/mml2015.el | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/lisp/gnus/mml-sec.el b/lisp/gnus/mml-sec.el
index 8dffcf872f3..6fb82836e9a 100644
=2D-- a/lisp/gnus/mml-sec.el
+++ b/lisp/gnus/mml-sec.el
@@ -34,6 +34,7 @@
 (autoload 'mail-strip-quoted-names "mail-utils")
 (autoload 'mml2015-sign "mml2015")
 (autoload 'mml2015-encrypt "mml2015")
+(autoload 'mml-unobtrusive-sign "mml2015")
 (autoload 'mml1991-sign "mml1991")
 (autoload 'mml1991-encrypt "mml1991")
 (autoload 'message-fetch-field "message")
@@ -56,6 +57,7 @@
   '(("smime"     mml-smime-sign-buffer     mml-smime-sign-query)
     ("pgp"       mml-pgp-sign-buffer       list)
     ("pgpauto"   mml-pgpauto-sign-buffer  list)
+    ("unobtrusive" mml-unobtrusive-sign-buffer list)
     ("pgpmime"   mml-pgpmime-sign-buffer   list))
   "Alist of MIME signer functions.")
=20
@@ -198,6 +200,10 @@ You can also customize or set `mml-signencrypt-style-a=
list' instead."
   (or (mml2015-sign cont)
       (error "Signing failed... inspect message logs for errors")))
=20
+(defun mml-unobtrusive-sign-buffer (cont)
+  (or (mml-unobtrusive-sign cont)
+      (error "Signing failed... inspect message logs for errors")))
+
 (defun mml-pgpmime-encrypt-buffer (cont &optional sign)
   (or (mml2015-encrypt cont sign)
       (error "Encryption failed... inspect message logs for errors")))
diff --git a/lisp/gnus/mml2015.el b/lisp/gnus/mml2015.el
index a46aa68f56a..646fb018a31 100644
=2D-- a/lisp/gnus/mml2015.el
+++ b/lisp/gnus/mml2015.el
@@ -25,6 +25,9 @@
 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
 ;; with both.
=20
+;; This is also capable of producing unobtrusive signatures based on
+;; draft-gallagher-email-unobtrusive-signatures
+
 ;;; Code:
=20
 (eval-when-compile (require 'cl-lib))
@@ -945,6 +948,42 @@ If set, it overrides the setting of `mml2015-sign-with=
-sender'."
     (insert (format "--%s--\n" boundary))
     (goto-char (point-max))))
=20
+;;; Unobtrusive Signatures, see:
+;;; https://datatracker.ietf.org/doc/draft-gallagher-email-unobtrusive-sig=
natures/
+
+; convert ASCII-armored PGP SIGNATURE block to base64-encoded with FWS
+; at the start of each line:
+(defun pgpsig-armor-to-wrapped-b64 (s)
+  (string-join
+   (string-split
+    (string-trim-right
+     (string-trim-left s "-----BEGIN PGP SIGNATURE-----\n\\(?:[^\n]+\n\\)*=
\n")
+     "\n\\(?:=3D....\n\\)?-----END PGP SIGNATURE-----\n?")
+    "\n")
+   "\n "))
+
+(defun mml-unobtrusive-sign (cont)
+  (goto-char (point-min))
+  (insert (cdr (assq 'likely-headers cont)))
+  (re-search-forward "^Content-Type: [^\n]*\\(\n[ \t][^\n]*$\\)*")
+  (insert "; hp=3D\"clear\"")
+  (re-search-forward "^")
+  (let* ((pair (mml-secure-epg-sign 'OpenPGP t))
+	 (signature (car pair)))
+    (unless (stringp signature)
+      (error "Signature failed"))
+    (goto-char (point-min))
+    (insert (format "Sig: t=3Dp; b=3D%s\n"
+                    (pgpsig-armor-to-wrapped-b64 signature)))
+    (let ((boundary (mml-compute-boundary cont)))
+      (goto-char (point-min))
+      (insert (format "Content-Type: multipart/mixed; boundary=3D\"%s\";\n"
+		      boundary))
+      (insert (format "\n--%s\n" boundary))
+      (goto-char (point-max))
+      (insert (format "\n--%s--\n" boundary))
+      (goto-char (point-max)))))
+
 ;;; General wrapper
=20
 (autoload 'gnus-buffer-live-p "gnus-util")
=2D-=20
2.47.2


--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline;
 filename=0003-mml-Add-C-c-RET-s-u-to-make-Unobtrusive-Signature.patch
Content-Transfer-Encoding: quoted-printable

From=20f03c16ddedaa0b7a39692629ab61e7c3b3e06201 Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@HIDDEN>
Date: Thu, 15 May 2025 22:03:25 -0400
Subject: [PATCH 3/3] mml: Add C-c RET s u to make Unobtrusive Signature

This adds to the default keymap to make it relatively easy to make an
Unobtrusive Signature when sending mail.

Signed-off-by: Daniel Kahn Gillmor <dkg@HIDDEN>
=2D--
 lisp/gnus/mml-sec.el | 5 +++++
 lisp/gnus/mml.el     | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lisp/gnus/mml-sec.el b/lisp/gnus/mml-sec.el
index 6fb82836e9a..9b703abd5f4 100644
=2D-- a/lisp/gnus/mml-sec.el
+++ b/lisp/gnus/mml-sec.el
@@ -285,6 +285,11 @@ Use METHOD if given.  Else use `mml-secure-method' or
   (interactive nil mml-mode)
   (mml-secure-part "pgpmime" 'sign))
=20
+(defun mml-secure-sign-unobtrusive ()
+  "Add MML tags to unobtrusively sign this MML part."
+  (interactive nil mml-mode)
+  (mml-secure-part "unobtrusive" 'sign))
+
 (defun mml-secure-sign-smime ()
   "Add MML tags to S/MIME sign this MML part."
   (interactive nil mml-mode)
diff --git a/lisp/gnus/mml.el b/lisp/gnus/mml.el
index 11a8de7c011..7d849335154 100644
=2D-- a/lisp/gnus/mml.el
+++ b/lisp/gnus/mml.el
@@ -1178,11 +1178,13 @@ If HANDLES is non-nil, use it instead reparsing the=
 buffer."
     "s" (define-keymap
           "p" #'mml-secure-message-sign-pgpmime
           "o" #'mml-secure-message-sign-pgp
=2D          "s" #'mml-secure-message-sign-smime)
+          "s" #'mml-secure-message-sign-smime
+          "u" #'mml-secure-message-sign-unobtrusive)
     "S" (define-keymap
           "p" #'mml-secure-sign-pgpmime
           "o" #'mml-secure-sign-pgp
=2D          "s" #'mml-secure-sign-smime)
+          "s" #'mml-secure-sign-smime
+          "u" #'mml-secure-message-sign-unobtrusive)
     "c" (define-keymap
           "p" #'mml-secure-message-encrypt-pgpmime
           "o" #'mml-secure-message-encrypt-pgp
=2D-=20
2.47.2


--=-=-=--

--==-=-=
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iHUEARYKAB0WIQRjrBGOWy5dZsiKhad4C4VO2cK0lgUCaCa3aQAKCRB4C4VO2cK0
liFeAP43PlQNzPjzuDY1zjtaV3Mbj82otoZ3wCoAVnVkSkpzfgEApsT3++6DkC7x
OecKQ1QstKo5QydIlEYwocH+IkE9SQQ=
=3Zmf
-----END PGP SIGNATURE-----
--==-=-=--

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Daniel Kahn Gillmor <dkg@HIDDEN>
Subject: bug#78448: Acknowledgement (30.1; mml: Produce Unobtrusive
 Signatures)
Message-ID: <handler.78448.B.174736780715118.ack <at> debbugs.gnu.org>
References: <87a57dciom.fsf@HIDDEN>
X-Gnu-PR-Message: ack 78448
X-Gnu-PR-Package: emacs,gnus
Reply-To: 78448 <at> debbugs.gnu.org
Date: Fri, 16 May 2025 03:57:03 +0000

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Message sent to bug-gnu-emacs@HIDDEN, bugs@HIDDEN:

Subject: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN, bugs@HIDDEN
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Resent-Sender: help-debbugs@HIDDEN
To: Daniel Kahn Gillmor <dkg@HIDDEN>, Eric Abrahamsen <eric@HIDDEN>
Cc: 78448 <at> debbugs.gnu.org
Date: Sat, 17 May 2025 13:15:43 +0300
Message-Id: <86v7pzv8z4.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87a57dciom.fsf@HIDDEN> (message from Daniel Kahn
 Gillmor on Thu, 15 May 2025 23:56:25 -0400)
References: <87a57dciom.fsf@HIDDEN>
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

> From: Daniel Kahn Gillmor <dkg@HIDDEN>
> Date: Thu, 15 May 2025 23:56:25 -0400
> 
> Package: emacs,gnus
> Version: 30.1
> 
> I'm running emacs 30.1 on debian.  When sending cleartext mail, i want
> to be able to produce an "Unobtrusive Signature" using OpenPGP as
> described in
> https://datatracker.ietf.org/doc/draft-gallagher-email-unobtrusive-signatures/
> 
> Those kinds of signatures provide end-to-end cryptographic protection
> for headers (based on
> https://datatracker.ietf.org/doc/draft-ietf-lamps-header-protection/ )
> as well as the message body, and are less likely to inflict bad UX or
> bad rendering on recipients using legacy MUAs compared to PGP/MIME (or
> inline PGP, for that matter).
> 
> These three patches appear to do the trick for me.  I'm not an elisp
> guru or a gnus expert.  I'm happy to hear any feedback about how they
> could be improved.

Eric, any comments to the patch or to the issue?

In any case, Daniel, to accept a contribution this large, we will need
you to assign to the FSF the copyright for your Emacs-related changes.
If you agree to do that, I will send you the form to fill and the
instructions to go with it.

Thanks.

Message sent to bug-gnu-emacs@HIDDEN, bugs@HIDDEN:

Subject: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
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Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: Eli Zaretskii <eliz@HIDDEN>, Eric Abrahamsen <eric@HIDDEN>
Cc: 78448 <at> debbugs.gnu.org
From: Daniel Kahn Gillmor <dkg@HIDDEN>
In-Reply-To: <86v7pzv8z4.fsf@HIDDEN>
References: <87a57dciom.fsf@HIDDEN> <86v7pzv8z4.fsf@HIDDEN>
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Date: Sat, 17 May 2025 23:16:39 -0400
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--=-=-=
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Hi Eli--

On Sat 2025-05-17 13:15:43 +0300, Eli Zaretskii wrote:
> In any case, Daniel, to accept a contribution this large, we will need
> you to assign to the FSF the copyright for your Emacs-related changes.
> If you agree to do that, I will send you the form to fill and the
> instructions to go with it.

I'm pretty frustrated and disappointed with the FSF these days, but i
still care about emacs, so i'm willing to make a copyright assignment
for the sake of the tooling here and the broader ecosystem around it.

Please send me the form and instructions.

       --dkg

--=-=-=
Content-Type: application/pgp-signature; name="signature.asc"

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XTisX8nQ5JUXTr8ANiPvMSZncL2dMA4=
=LUVM
-----END PGP SIGNATURE-----
--=-=-=--

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> From: Daniel Kahn Gillmor <dkg@HIDDEN>
> Cc: 78448 <at> debbugs.gnu.org
> Date: Sat, 17 May 2025 23:16:39 -0400
> 
> Hi Eli--
> 
> On Sat 2025-05-17 13:15:43 +0300, Eli Zaretskii wrote:
> > In any case, Daniel, to accept a contribution this large, we will need
> > you to assign to the FSF the copyright for your Emacs-related changes.
> > If you agree to do that, I will send you the form to fill and the
> > instructions to go with it.
> 
> I'm pretty frustrated and disappointed with the FSF these days, but i
> still care about emacs, so i'm willing to make a copyright assignment
> for the sake of the tooling here and the broader ecosystem around it.
> 
> Please send me the form and instructions.

Thanks, form sent off-list.

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From: Daniel Kahn Gillmor <dkg@HIDDEN>
To: 78448 <at> debbugs.gnu.org
Subject: [PATCH 3/3 v2] Re: 30.1; mml: Produce Unobtrusive Signatures
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--=-=-=
Content-Type: text/plain

Attached is a revised version of patch 3, which corrects the default
keybindings.

        --dkg


--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline;
 filename=0003-mml-Add-C-c-RET-s-u-to-make-Unobtrusive-Signature.patch
Content-Transfer-Encoding: quoted-printable

From=20a5de7ee57e1933a0783c8346db52c569074c07f7 Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@HIDDEN>
Date: Thu, 15 May 2025 22:03:25 -0400
Subject: [PATCH] mml: Add C-c RET s u to make Unobtrusive Signature

This adds to the default keymap to make it relatively easy to make an
Unobtrusive Signature when sending mail.

Unobtrusive Signatures are defined on a per-message basis, and
explicitly ignored per-part, so we do not facilitate part-based signing.

Signed-off-by: Daniel Kahn Gillmor <dkg@HIDDEN>
=2D--
 lisp/gnus/mml-sec.el | 5 +++++
 lisp/gnus/mml.el     | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lisp/gnus/mml-sec.el b/lisp/gnus/mml-sec.el
index 6fb82836e9a..71913c8e8cc 100644
=2D-- a/lisp/gnus/mml-sec.el
+++ b/lisp/gnus/mml-sec.el
@@ -399,6 +399,11 @@ Use METHOD if given.  Else use `mml-secure-method' or
    (or method mml-secure-method mml-default-sign-method)
    'encrypt))
=20
+(defun mml-secure-message-sign-unobtrusive ()
+  "Add MML tag to encrypt/sign the entire message."
+  (interactive nil mml-mode)
+  (mml-secure-message "unobtrusive" 'sign))
+
 (defun mml-secure-message-sign-smime ()
   "Add MML tag to encrypt/sign the entire message."
   (interactive nil mml-mode)
diff --git a/lisp/gnus/mml.el b/lisp/gnus/mml.el
index 11a8de7c011..52c9c63833a 100644
=2D-- a/lisp/gnus/mml.el
+++ b/lisp/gnus/mml.el
@@ -1178,7 +1178,8 @@ If HANDLES is non-nil, use it instead reparsing the b=
uffer."
     "s" (define-keymap
           "p" #'mml-secure-message-sign-pgpmime
           "o" #'mml-secure-message-sign-pgp
=2D          "s" #'mml-secure-message-sign-smime)
+          "s" #'mml-secure-message-sign-smime
+          "u" #'mml-secure-message-sign-unobtrusive)
     "S" (define-keymap
           "p" #'mml-secure-sign-pgpmime
           "o" #'mml-secure-sign-pgp
=2D-=20
2.47.2


--=-=-=--

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Subject: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
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[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > i want
  > > to be able to produce an "Unobtrusive Signature" using OpenPGP as
  > > described in
  > > https://datatracker.ietf.org/doc/draft-gallagher-email-unobtrusive-signatures/

Can GPG do this job also?  If so, we should by default use GPG to do
this, unless the user specifies a different command to use.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

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Subject: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
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--=-=-=
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From: Daniel Kahn Gillmor <dkg@HIDDEN>
To: rms@HIDDEN, Eli Zaretskii <eliz@HIDDEN>
Cc: eric@HIDDEN, 78448 <at> debbugs.gnu.org
Subject: Re: bug#78448: 30.1; mml: Produce Unobtrusive Signatures
In-Reply-To: <E1uKG8r-0008CY-EY@HIDDEN>
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Date: Wed, 28 May 2025 10:07:25 -0400
Message-ID: <87frgorfqa.fsf@HIDDEN>
Content-Type: text/plain; hp="clear"

On Wed 2025-05-28 08:44:21 -0400, Richard Stallman wrote:
> [ dkg wrote: ]
>   > > i want to be able to produce an "Unobtrusive Signature" using
>   > > OpenPGP as described in
>   > > https://datatracker.ietf.org/doc/draft-gallagher-email-unobtrusive-signatures/
>
> Can GPG do this job also?  If so, we should by default use GPG to do
> this, unless the user specifies a different command to use.

The proposed patch series explicitly relies on emacs's epg to make the
actual signature.  epg is an emacs library to use GPG.  So i think what
you're asking for is already being done in this series.

For background: GPG typically does not handle e-mails directly.  Rather,
the mail user agent (MUA) needs to figure out how to modify the pending
e-mail message to be able to feed it into GPG as a text or binary
document to make an OpenPGP signature; then the MUA has to restructure
the message again to ship both the substance and the signature into a
single e-mail message.

Regards,

        --dkg

--=-=-=--

Last modified: Wed, 28 May 2025 14:15:01 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.