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When I try to send mail with emacs using SMTP, I get error "Multibyte char=
acter
in data for base64 encoding".
In the current code I have narrowed it down to line 637 in smtpmail.el, wh=
ere an
attempt is made to base64 encode a string containing the password which, o=
f
course, can contain multibyte characters.
With a simple password some time ago, I could send mail.
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Ingo Brunberg <ingo_brunberg@HIDDEN> Subject: bug#75628: Acknowledgement (31.0.50; Error sending mail using SMTP - base64 encoding fails) Message-ID: <handler.75628.B.17371091503432.ack <at> debbugs.gnu.org> References: <trinity-faaa80ad-9f2d-4964-89e3-f49a96c8f898-1737109132667@trinity-msg-rest-webde-webde-live-8d9fbf8c-vgkbm> X-Gnu-PR-Message: ack 75628 X-Gnu-PR-Package: emacs Reply-To: 75628 <at> debbugs.gnu.org Date: Fri, 17 Jan 2025 10:20:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 75628 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 75628: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D75628 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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> Date: Fri, 17 Jan 2025 10:18:52 +0000
> From: Ingo Brunberg via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>
> When I try to send mail with emacs using SMTP, I get error "Multibyte character
> in data for base64 encoding".
>
> In the current code I have narrowed it down to line 637 in smtpmail.el, where an
> attempt is made to base64 encode a string containing the password which, of
> course, can contain multibyte characters.
>
> With a simple password some time ago, I could send mail.
Thanks, but please show a complete recipe, preferably starting from
"emacs -Q".
base64 encoding indeed requires its input to be a unibyte string, but
it is impossible to guess how this failed to happen without seeing the
sequence of commands you typed to trigger the problem.
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>>>>> On Fri, 17 Jan 2025 10:18:52 +0000, Ingo Brunberg via "Bug reports fo=
r GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> =
said:
Ingo> When I try to send mail with emacs using SMTP, I get error "Multi=
byte character
Ingo> in data for base64 encoding".
Ingo> In the current code I have narrowed it down to line 637 in smtpma=
il.el, where an
Ingo> attempt is made to base64 encode a string containing the password=
which, of
Ingo> course, can contain multibyte characters.
Ingo> With a simple password some time ago, I could send mail.
Does this fix it? I guess at least "AUTH LOGIN" needs similar
treatment, and probably "AUTH CRAM-MD5". I don=CA=BCt think XOAUTH2 needs
it, but I=CA=BCll check.
diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index 6cb576fe72b..5aebbec14d0 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -631,11 +631,12 @@ smtpmail-try-auth-method
;; violate a SHOULD in RFC 2222 paragraph 5.1. Note that this
;; is not sent if the server did not advertise AUTH PLAIN in
;; the EHLO response. See RFC 2554 for more info.
+ (let ((password (encode-coding-string password 'utf-8)))
(smtpmail-command-or-throw
process
(concat "AUTH PLAIN "
(base64-encode-string (concat "\0" user "\0" password) t))
- 235))
+ 235)))
=20
(cl-defmethod smtpmail-try-auth-method
(process (_mech (eql 'xoauth2)) user password)
Robert
--=20
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>>>>> On Fri, 17 Jan 2025 14:55:55 +0200, Eli Zaretskii <eliz@HIDDEN> said:
>> Date: Fri, 17 Jan 2025 10:18:52 +0000
>> From: Ingo Brunberg via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>=20
>> When I try to send mail with emacs using SMTP, I get error "Multibyt=
e character
>> in data for base64 encoding".
>>=20
>> In the current code I have narrowed it down to line 637 in smtpmail.=
el, where an
>> attempt is made to base64 encode a string containing the password wh=
ich, of
>> course, can contain multibyte characters.
>>=20
>> With a simple password some time ago, I could send mail.
Eli> Thanks, but please show a complete recipe, preferably starting from
Eli> "emacs -Q".
Eli> base64 encoding indeed requires its input to be a unibyte string, =
but
Eli> it is impossible to guess how this failed to happen without seeing=
the
Eli> sequence of commands you typed to trigger the problem.
If the password is coming from 'auth-source', it will be a multibyte
string:
ELISP> (auth-info-password (car (auth-source-search :host "test")))
"b=C3=A4r"
ELISP> (multibyte-string-p (auth-info-password (car (auth-source-search :ho=
st "test"))))
t
Robert
--=20
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> Cc: Ingo Brunberg <ingo_brunberg@HIDDEN>
> From: Robert Pluim <rpluim@HIDDEN>
> Date: Fri, 17 Jan 2025 14:15:26 +0100
>
> Ingo> With a simple password some time ago, I could send mail.
>
> Does this fix it? I guess at least "AUTH LOGIN" needs similar
> treatment, and probably "AUTH CRAM-MD5". I donʼt think XOAUTH2 needs
> it, but Iʼll check.
If this is the fix, then how do you explain what the OP says, that
"some time ago" he could do this without problems? Do you assume that
the "simple password" was plain-ASCII or something?
The OP didn't show the data collected by report-emacs-bug, so we don't
know the locale's encoding in his case. That could perhaps explain
the difference in behavior.
Also, smtpmail-command-or-throw calls process-send-string, which
should already encode the command. So the call to
encode-coding-string is almost certainly incorrect; if anything, we
should bind coding-system-for-write to 'utf-8'. (Btw, how do we know
UTF-8 is the right encoding in this case? is that in some relevant
RFC?)
Thanks.
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>>>>> On Fri, 17 Jan 2025 15:36:59 +0200, Eli Zaretskii <eliz@HIDDEN> said:
>> Cc: Ingo Brunberg <ingo_brunberg@HIDDEN>
>> From: Robert Pluim <rpluim@HIDDEN>
>> Date: Fri, 17 Jan 2025 14:15:26 +0100
>>=20
Ingo> With a simple password some time ago, I could send mail.
>>=20
>> Does this fix it? I guess at least "AUTH LOGIN" needs similar
>> treatment, and probably "AUTH CRAM-MD5". I don=CA=BCt think XOAUTH2 =
needs
>> it, but I=CA=BCll check.
Eli> If this is the fix, then how do you explain what the OP says, that
Eli> "some time ago" he could do this without problems? Do you assume =
that
Eli> the "simple password" was plain-ASCII or something?
Yes
Eli> The OP didn't show the data collected by report-emacs-bug, so we d=
on't
Eli> know the locale's encoding in his case. That could perhaps explain
Eli> the difference in behavior.
Eli> Also, smtpmail-command-or-throw calls process-send-string, which
Eli> should already encode the command. So the call to
Eli> encode-coding-string is almost certainly incorrect; if anything, we
Eli> should bind coding-system-for-write to 'utf-8'. (Btw, how do we k=
now
Eli> UTF-8 is the right encoding in this case? is that in some relevant
Eli> RFC?)
The encoding done by process-send-string is done after the base64
encoding of the password used by the "AUTH PLAIN" command, so it
doesn=CA=BCt help.
RFC 4616 specifies that the arguments to "AUTH PLAIN" are in UTF-8
(prior to encoding with base64, see RFC 4954), so we should be
encoding 'user' as well, strictly speaking.
Robert
--=20
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Hello Robert,
yes, your patch does indeed fix the issue. I also guess there are more
places which need that treatment. Glad, it works for me again.
Thanks
Ingo
Robert Pluim <rpluim@HIDDEN> writes:
>>>>>> On Fri, 17 Jan 2025 10:18:52 +0000, Ingo Brunberg via "Bug reports f=
or GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>=
said:
>
> Ingo> When I try to send mail with emacs using SMTP, I get error "Mul=
tibyte character
> Ingo> in data for base64 encoding".
>
> Ingo> In the current code I have narrowed it down to line 637 in smtp=
mail.el, where an
> Ingo> attempt is made to base64 encode a string containing the passwo=
rd which, of
> Ingo> course, can contain multibyte characters.
>
> Ingo> With a simple password some time ago, I could send mail.
>
> Does this fix it? I guess at least "AUTH LOGIN" needs similar
> treatment, and probably "AUTH CRAM-MD5". I don=CA=BCt think XOAUTH2 needs
> it, but I=CA=BCll check.
>
> diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
> index 6cb576fe72b..5aebbec14d0 100644
> --- a/lisp/mail/smtpmail.el
> +++ b/lisp/mail/smtpmail.el
> @@ -631,11 +631,12 @@ smtpmail-try-auth-method
> ;; violate a SHOULD in RFC 2222 paragraph 5.1. Note that this
> ;; is not sent if the server did not advertise AUTH PLAIN in
> ;; the EHLO response. See RFC 2554 for more info.
> + (let ((password (encode-coding-string password 'utf-8)))
> (smtpmail-command-or-throw
> process
> (concat "AUTH PLAIN "
> (base64-encode-string (concat "\0" user "\0" password) t))
> - 235))
> + 235)))
>=20=20
> (cl-defmethod smtpmail-try-auth-method
> (process (_mech (eql 'xoauth2)) user password)
>
>
>
>
>
>
> Robert
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> From: Robert Pluim <rpluim@HIDDEN>
> Cc: 75628 <at> debbugs.gnu.org, ingo_brunberg@HIDDEN
> Date: Fri, 17 Jan 2025 14:59:59 +0100
>
> >>>>> On Fri, 17 Jan 2025 15:36:59 +0200, Eli Zaretskii <eliz@HIDDEN> said:
>
> >> Cc: Ingo Brunberg <ingo_brunberg@HIDDEN>
> >> From: Robert Pluim <rpluim@HIDDEN>
> >> Date: Fri, 17 Jan 2025 14:15:26 +0100
> >>
> Ingo> With a simple password some time ago, I could send mail.
> >>
> >> Does this fix it? I guess at least "AUTH LOGIN" needs similar
> >> treatment, and probably "AUTH CRAM-MD5". I donʼt think XOAUTH2 needs
> >> it, but Iʼll check.
>
> Eli> If this is the fix, then how do you explain what the OP says, that
> Eli> "some time ago" he could do this without problems? Do you assume that
> Eli> the "simple password" was plain-ASCII or something?
>
> Yes
>
> Eli> The OP didn't show the data collected by report-emacs-bug, so we don't
> Eli> know the locale's encoding in his case. That could perhaps explain
> Eli> the difference in behavior.
>
> Eli> Also, smtpmail-command-or-throw calls process-send-string, which
> Eli> should already encode the command. So the call to
> Eli> encode-coding-string is almost certainly incorrect; if anything, we
> Eli> should bind coding-system-for-write to 'utf-8'. (Btw, how do we know
> Eli> UTF-8 is the right encoding in this case? is that in some relevant
> Eli> RFC?)
>
> The encoding done by process-send-string is done after the base64
> encoding of the password used by the "AUTH PLAIN" command, so it
> doesnʼt help.
>
> RFC 4616 specifies that the arguments to "AUTH PLAIN" are in UTF-8
> (prior to encoding with base64, see RFC 4954), so we should be
> encoding 'user' as well, strictly speaking.
OK, but then I think we need to bind coding-system-for-write to
no-conversion when calling smtpmail-command-or-throw in this
case. because the string is already encoded.
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From: Robert Pluim <rpluim@HIDDEN>
In-Reply-To: <86frlhe6gi.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 17 Jan
2025 18:43:57 +0200")
References: <trinity-faaa80ad-9f2d-4964-89e3-f49a96c8f898-1737109132667@trinity-msg-rest-webde-webde-live-8d9fbf8c-vgkbm>
<87jzateg41.fsf@HIDDEN> <86ikqdef44.fsf@HIDDEN>
<87bjw5ee1s.fsf@HIDDEN> <86frlhe6gi.fsf@HIDDEN>
Date: Fri, 17 Jan 2025 18:04:12 +0100
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>>>>> On Fri, 17 Jan 2025 18:43:57 +0200, Eli Zaretskii <eliz@HIDDEN> said:
Eli> OK, but then I think we need to bind coding-system-for-write to
Eli> no-conversion when calling smtpmail-command-or-throw in this
Eli> case. because the string is already encoded.
No need, the password is utf-8 encoded, then it=CA=BCs base64 encoded, then
it=CA=BCs concatenated with "AUTH PLAIN", and the result is then passed to
smtpmail-command-or-thow. So we can continue to use the value for
coding-system-for-write used by 'smtpmail-via-smtp', which is 'binary.
Robert
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