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bug#48562: 27.1; smtpmail does not attempt alternative auth methods when
From: |
klu |
Subject: |
bug#48562: 27.1; smtpmail does not attempt alternative auth methods when primary (cram-md5) fails |
Date: |
Fri, 21 May 2021 06:24:26 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (berkeley-unix) |
For some reason the SMTP server I talk to (mx.sdf.org) fails the CRAM-MD5
authetication, and the bug is, when this happens, smtpmail didn't know to try
the rest of the supported auth methods (namely, 'plain, and 'login), and
therefore, fails to send the mail.
The SMTP info is:
(setq smtpmail-smtp-server "mx.sdf.org")
(setq smtpmail-smtp-service 587)
(setq mtpmail-stream-type 'starttls)
And here is smtpmail's trace on the failure - notice how it stopped after
CRAM-MD5 failure and didn't try the rest:
220 mx.sdf.org ESMTP Sendmail 8.15.2/8.14.5; Thu, 20 May 2021 23:55:20 GMT
250-mx.sdf.org Hello xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx [xx.xxx.xxx.xx],
pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE 2147483648
250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN
250-STARTTLS
250-DELIVERBY
250 HELP
220 2.0.0 Ready to start TLS
250-mx.sdf.org Hello xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE 2147483648
250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN
250-DELIVERBY
250 HELP
AUTH CRAM-MD5
334 PDM1O___________________________________Zz4=
a2___________________________________________TAx
535 5.7.0 authentication failed
QUIT
221 2.0.0 mx.sdf.org closing connection
Process smtpmail connection broken by remote peer
This is clearly Emacs problem. Because I can send mail using other clients,
including
iOS mail app, mac mail app, Alpine, and, below as an example, hand-made Python
code:
The code:
>>> import smtplib as s
>>> with s.SMTP("mx.sdf.org", 587) as smtp:
... smtp.set_debuglevel(2)
... smtp.login('foobar', '___________')
... smtp.sendmail(
... "From: foobar@sdf.org",
... "To: foobar@example.com",
... "hello"
... )
...
The log (notice how Python also fails CRAM-MD5, but proceeds wit PLAIN which
succeeded):
05:04:16.672784 send: 'ehlo [127.0.0.1]\r\n'
05:04:16.689710 reply: b'250-mx.sdf.org Hello
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx [xx.xxx.xxx.xx], pleased to meet you\r\n'
05:04:16.689792 reply: b'250-ENHANCEDSTATUSCODES\r\n'
05:04:16.689840 reply: b'250-PIPELINING\r\n'
05:04:16.689877 reply: b'250-EXPN\r\n'
05:04:16.689914 reply: b'250-VERB\r\n'
05:04:16.689951 reply: b'250-8BITMIME\r\n'
05:04:16.689987 reply: b'250-SIZE 2147483648\r\n'
05:04:16.690023 reply: b'250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN\r\n'
05:04:16.690060 reply: b'250-STARTTLS\r\n'
05:04:16.690096 reply: b'250-DELIVERBY\r\n'
05:04:16.690132 reply: b'250 HELP\r\n'
05:04:16.690178 reply: retcode (250); Msg: b'mx.sdf.org Hello
c-73-109-252-21.hsd1.wa.comcast.net [73.109.252.
21], pleased to meet
you\nENHANCEDSTATUSCODES\nPIPELINING\nEXPN\nVERB\n8BITMIME\nSIZE
2147483648\nAUTH DIGEST-
MD5 CRAM-MD5 PLAIN\nSTARTTLS\nDELIVERBY\nHELP'
05:04:16.690386 send: 'AUTH CRAM-MD5\r\n'
05:04:16.701705 reply: b'334 PDM3NTM_____________________________Lm9yZz4=\r\n'
05:04:16.701776 reply: retcode (334); Msg:
b'PDM3NT______________________________Lm9yZz4='
05:04:16.701936 send: 'a2x1IDM3__________________________________c2ZjNk\r\n'
05:04:16.713173 reply: b'535 5.7.0 authentication failed\r\n'
05:04:16.713247 reply: retcode (535); Msg: b'5.7.0 authentication failed'
05:04:16.713339 send: 'AUTH PLAIN ____\r\n'
05:04:16.790840 reply: b'235 2.0.0 OK Authenticated\r\n'
05:04:16.790938 reply: retcode (235); Msg: b'2.0.0 OK Authenticated'
(235, b'2.0.0 OK Authenticated')
05:04:16.791612 send: 'mail FROM:<foobar@sdf.org> size=5\r\n'
05:04:16.810506 reply: b'250 2.1.0 <foobar@sdf.org>... Sender ok\r\n'
05:04:16.810579 reply: retcode (250); Msg: b'2.1.0 <foobar@sdf.org>... Sender
ok'
05:04:16.810767 send: 'rcpt TO:<foobar@example.com>\r\n'
05:04:16.821945 reply: b'250 2.1.5 <foobar@example.com>... Recipient ok\r\n'
05:04:16.822010 reply: retcode (250); Msg: b'2.1.5 <foobar@example.com>...
Recipient ok'
05:04:16.822059 send: 'data\r\n'
05:04:16.838365 reply: b'354 Enter mail, end with "." on a line by itself\r\n'
05:04:16.838434 reply: retcode (354); Msg: b'Enter mail, end with "." on a
line by itself'
05:04:16.838474 data: (354, b'Enter mail, end with "." on a line by itself')
05:04:16.838698 send: b'hello\r\n.\r\n'
05:04:16.857556 reply: b'250 2.0.0 xxxxxxxxxxxxxx Message accepted for
delivery\r\n'
05:04:16.857629 reply: retcode (250); Msg: b'2.0.0 xxxxxxxxxxxxxx Message
accepted for delivery'
05:04:16.857669 data: (250, b'2.0.0 xxxxxxxxxxxxxx Message accepted for
delivery')
{}
05:04:16.857730 send: 'QUIT\r\n'
05:04:16.868917 reply: b'221 2.0.0 mx.sdf.org closing connection\r\n'
05:04:16.868990 reply: retcode (221); Msg: b'2.0.0 mx.sdf.org closing
connection'
Finally, as a work around, I manually set `smtpmail-auth-supported` to only
PLAIN. And this works.
(setq smtpmail-auth-supported '(plain))
Below are Emacs Bug Report generated info:
-----------------------------------------
In GNU Emacs 27.1 (build 1, amd64-portbld-freebsd11.4)
System Description: 11.4-RELEASE-p6
Recent messages:
Checking new news...
Reading active file via nnnil...done
Reading active file from archive via nnfolder...done
Reading active file via nndraft...done
Checking new news...done
Saving file /home/klu/News/drafts/drafts/3...
Wrote /home/klu/News/drafts/drafts/3
Deleting article /home/klu/News/drafts/drafts/1 in drafts...
current-kill: Kill ring is empty [4 times]
C-c k is undefined
Configured using:
'configure --disable-build-details --localstatedir=/var --with-x
--enable-acl --without-cairo --with-dbus --without-gconf --without-gif
--with-gnutls --with-gsettings --with-harfbuzz --without-jpeg
--with-json --with-file-notification=kqueue --with-lcms2
--with-m17n-flt --without-imagemagick --with-mailutils --with-modules
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--prefix=/usr/local --mandir=/usr/local/man --disable-silent-rules
--infodir=/usr/local/share/emacs/info/
--build=amd64-portbld-freebsd11.4 'CFLAGS=-O2 -pipe
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-fno-strict-aliasing ' 'CPPFLAGS=-isystem /usr/local/include' 'LDFLAGS=
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Configured features:
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HARFBUZZ XFT ZLIB OLDXMENU X11 XDBE XIM MODULES THREADS JSON PDUMPER
LCMS2 GMP
Important settings:
value of $LC_ALL: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Group
Minor modes in effect:
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gnus-undo-mode: t
global-display-line-numbers-mode: t
display-line-numbers-mode: t
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better-jumper-mode: t
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evil-mode: t
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helm-mode: t
shell-dirtrack-mode: t
async-bytecomp-package-mode: t
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straight-package-neutering-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
line-number-mode: t
transient-mark-mode: t
Load-path shadows:
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Features:
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mailheader gnus-win gnus nnheader gnus-util rmail rmail-loaddefs rfc2047
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misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
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base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind kqueue lcms2 dynamic-setting
system-font-setting font-render-setting x multi-tty make-network-process
emacs)
Memory information:
((conses 16 219173 19146)
(symbols 48 23877 2)
(strings 32 69897 3387)
(string-bytes 1 2641629)
(vectors 16 34835)
(vector-slots 8 411664 18272)
(floats 8 271 499)
(intervals 56 455 0)
(buffers 1000 25))
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klu <=