bug#15057: 24.3.50; TLS error with reasonably high gnutls-min-prime-bits

[Tassilo Horn]

When TLS support landed and Gnus used it, I frequently had messages like
"the Diffie-Hellman prime has been lowered to XXX bits" for XXX being
256(?) or something like that.  Then I've set

  (setq gnutls-min-prime-bits 2048)

and everything worked smoothly, I got no warning messages, and I felt
more secure.  Well, until today.  When I fired up Gnus today, I got this
error for my Fastmail IMAP account:

--8<---------------cut here---------------start------------->8---
20130809T100721.075> Opening connection to mail.messagingengine.com via tls...
gnutls.c: [0] (Emacs) fatal error: The Diffie-Hellman prime sent by the server 
is not acceptable (not long enough).
gnutls.el: (err=[-63] The Diffie-Hellman prime sent by the server is not 
acceptable (not long enough).) boot: (:priority NORMAL :hostname 
mail.messagingengine.com :loglevel 0 :min-prime-bits 2048 :trustfiles 
(/etc/ssl/certs/ca-certificates.crt) :crlfiles nil :keylist nil :verify-flags 
nil :verify-error nil :verify-hostname-error nil :callbacks nil)
20130809T100721.380> Unable to open server nnimap+Fastmail due to: GnuTLS 
error: #<process *nnimap*<1>>, -63
gnutls.c: [0] (Emacs) fatal error: An unexpected TLS handshake packet was 
received. [100 times]
--8<---------------cut here---------------end--------------->8---

All other accounts still worked just fine.  Lowering
`gnutls-min-prime-bits' to 1024 makes the Fastmail account work again,
too.  So apparently Fastmail doesn't support 2048 bit sized DH primes
anymore (or maybe just today/now) for whatever reason.

Would it be possible to have a new variable
`gnutls-preferred-prime-bits' which is tried first for every connection?
If the server doesn't want to, you'd get a warning and the number of
bits would be lowered, but never below `gnutls-min-prime-bits' which
would still be the hard limit where you get an error.

That way, I could have

  (setq gnutls-min-prime-bits 1024
        gnutls-preferred-prime-bits 2048)

which would successfully use 2048 for all my IMAP connections except for
the Fastmail one today.



In GNU Emacs 24.3.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.2)
 of 2013-08-09 on thinkpad
Bzr revision: monnier@iro.umontreal.ca-20130809011942-ekqcyfmqaf1xicqa
Windowing system distributor `The X.Org Foundation', version 11.0.11402901
System Description:     NAME=Gentoo

Configured using:
 `configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --libdir=/usr/lib64 --disable-silent-rules
 --disable-dependency-tracking --program-suffix=-emacs-24-vcs
 --program-transform-name=s/^(emacs)-[0-9].*-././
 --infodir=/usr/share/info/emacs-24-vcs
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --with-gameuser=games --without-compress-info
 --with-file-notification=inotify --disable-acl --with-dbus
 --with-gnutls --with-gpm --without-hesiod --without-kerberos
 --without-kerberos5 --with-xml2 --without-selinux --without-wide-int
 --with-sound --with-x --without-ns --without-gconf --with-gsettings
 --with-toolkit-scroll-bars --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xpm --with-imagemagick --with-xft
 --with-libotf --with-m17n-flt --with-x-toolkit=gtk3
 GENTOO_PACKAGE=app-editors/emacs-vcs-24.3.9999 EBZR_BRANCH=trunk
 EBZR_REVNO=113772 CFLAGS='-march=native -pipe -g3 -ggdb'
 LDFLAGS='-Wl,-O1 -Wl,--as-needed''

Important settings:
  value of $LC_COLLATE: C
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Message

Minor modes in effect:
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  diff-auto-refine-mode: t
  mml-mode: t
  global-edit-server-edit-mode: t
  yas-minor-mode: t
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Recent input:
l s - m i M-/ . M-q <up> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> M-q <down> <return> <return> b <tab> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <down> <left> <right> <right> <left> SPC SPC S 
o SPC a p p a r e n t l y SPC F a s t m a i l SPC d 
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SPC s i z e d SPC p r i m e s SPC a n y m o r e SPC 
f o r SPC w h a t e v e r SPC r i <backspace> e a s 
o n . <up> <down> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
SPC ( o r SPC m a y b e SPC j u s t SPC t o d a y / 
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<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
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<right> <right> <backspace> <backspace> <return> <return> 
M-q <down> <down> <right> <right> <right> <right> <right> 
<right> <M-backspace> <M-backspace> <M-backspace> f 
i r s t SPC f o r SPC e v e r y SPC s e r v e r M-q 
<right> <backspace> ? M-q <up> <up> <up> <up> <up> 
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<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> M-x 
r e p o <tab> <return>

Recent messages:
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/usr/share/emacs/24.3.50/lisp/gnus/gnus-sieve
~/Repos/el/gnus/lisp/gnus-agent hides 
/usr/share/emacs/24.3.50/lisp/gnus/gnus-agent
~/Repos/el/gnus/lisp/messcompat hides 
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~/Repos/el/gnus/lisp/mm-uu hides /usr/share/emacs/24.3.50/lisp/gnus/mm-uu
~/Repos/el/gnus/lisp/gnus-logic hides 
/usr/share/emacs/24.3.50/lisp/gnus/gnus-logic
~/Repos/el/gnus/lisp/gnus-topic hides 
/usr/share/emacs/24.3.50/lisp/gnus/gnus-topic
~/Repos/el/gnus/lisp/gnus-diary hides 
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~/Repos/el/gnus/lisp/gnus-setup hides 
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~/Repos/el/gnus/lisp/nnmbox hides /usr/share/emacs/24.3.50/lisp/gnus/nnmbox
~/Repos/el/gnus/lisp/rfc1843 hides /usr/share/emacs/24.3.50/lisp/gnus/rfc1843
~/Repos/el/gnus/lisp/gnus-eform hides 
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~/Repos/el/gnus/lisp/nnagent hides /usr/share/emacs/24.3.50/lisp/gnus/nnagent
~/Repos/el/gnus/lisp/mail-parse hides 
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~/Repos/el/gnus/lisp/parse-time hides 
/usr/share/emacs/24.3.50/lisp/calendar/parse-time

Features:
(shadow emacsbug flow-fill mm-archive hippie-exp timezone oauth2 json
plstore align url-http url-gw url-auth pp mailalias smtpmail sendmail qp
mule-util sort smiley gnus-cite gnus-async gnus-bcklg gnus-draft gnus-ml
misearch multi-isearch vc-git cus-start cus-load hl-line nndraft nnmh
rot13 utf-7 gnutls network-stream starttls nnimap parse-time tls utf7
netrc nnml nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual
gnus-cache gnus-demon nntp spam spam-stat gnus-uu yenc gnus-msg
gnus-gravatar mail-extr gravatar gnus-topic nnir gnus-registry registry
eieio-base th-private highlight-parentheses stratego-mode go-mode-load
greql-mode tg-mode generic preview-latex tex-site auto-loads paredit
magit-cherry magit-bisect magit-log-edit log-edit pcvs-util add-log
magit-key-mode magit diff-mode magit-compat epa-file epa epg rdictcc
google-contacts-message google-contacts-gnus gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig gnus-sum nnoo gnus-group
gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
gnus-win gnus gnus-ems gnus-compat nnheader google-contacts url-cache
google-oauth dired-x em-term term ehelp electric esh-opt esh-ext
esh-util highlight-symbol boxquote ecomplete message idna rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev mail-utils gmm-utils mailheader info edit-server
server yasnippet help-mode disp-table noutline outline browse-kill-ring
recentf tree-widget wid-edit helm-nrepl helm-elisp helm-eval helm-info
helm-net browse-url xml url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util url-parse url-vars mailcap
helm-plugin nrepl ewoc eldoc arc-mode archive-mode etags clojure-mode
derived imenu inf-lisp tramp tramp-compat auth-source eieio byte-opt
bytecomp byte-compile cconv eieio-core gnus-util mm-util mail-prsvr
password-cache tramp-loaddefs trampver shell pcomplete format-spec
helm-buffers helm-grep helm-regexp grep helm-elscreen helm-utils dired
compile comint ansi-color ring helm helm-config helm-aliases easymenu
uniquify multiple-cursors mc-separate-operations rectangular-region-mode
mc-mark-pop mc-mark-more thingatpt mc-cycle-cursors mc-edit-lines
multiple-cursors-core easy-mmode rect iedit help-macro iedit-lib cl-macs
gv cl superword subword saveplace savehist paren ido mb-depth advice
help-fns diminish rx windmove edmacro kmacro cl-loaddefs cl-lib
gnus-load tsdh-dark-theme ack-and-a-half-autoloads boxquote-autoloads
browse-kill-ring-autoloads debbugs-autoloads graphviz-dot-mode-autoloads
highlight-parentheses-autoloads markdown-mode-autoloads
memory-usage-autoloads window-number-autoloads package site-gentoo
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese hebrew greek romanian slovak czech european ethiopic
indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)