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GnuTLS 2.12.0 adds PKCS11 support using p11-kit and by default will
autoload modules, which interoperates badly with GNOME keyring
integration, configured via paths in environment variables, and Exim
invoked by the user (eg, mailq) will then try to load the modules, fail
and spew warnings from the module for a library loaded by a library.
http://www.gnu.org/software/gnutls/manual/gnutls.html#Smart-cards-and-HSMs
documents that to prevent this, explicitly init PKCS11 before calling
gnutls_global_init(). So we do so, unless the admin sets the new
option.
Reported by Andreas Metzler, who confirmed that the added calls fixed
the problem for him.
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fixes bug 1117
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Also fix doc claim that value is unexpanded.
Also strip affix whitespace before numeric conversion and fixed string comparison.
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Could not find an API for use with OpenSSL, so GnuTLS only
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Janne Snabb tracked down the GnuTLS 2.12 vs NSS (Thunderbird) interop
problems to a hard-coded limit of 2236 bits for DH in NSS while GnuTLS
was suggesting 2432 bits as normal.
Added new global option tls_dh_max_bits to clamp all DH values (client
or server); unexpanded integer. Default value to 2236. Apply to both
GnuTLS and OpenSSL (which requires tls_dh_params for this).
Tired of debugging "SMTP fails TLS" error messages in mailing-lists
caused by OpenSSL library/include clashes, and of finding out I typo'd
in tls_require_ciphers only at the STARTTLS handshake. During readconf,
fork/drop-privs/initialise-TLS-library. In that, if tls_require_ciphers
is set, then validate it.
The validation child will panic if it can't initialise or if
tls_require_ciphers can't be parsed, else it exits 0. If the child
exits anything other than 0, the main Exim process will exit.
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gnutls_sec_param_to_pk_bits() and gnutls_rnd() are both new as of
GnuTLS 2.12.x. Guard their usage on 2.12.0+ at compile time.
In older versions, the vaguely_random_number() function just immediately
calls the fallback, so it's the same as before this change (just one
extra indirection in the code-path).
Define a constant of 1024 for dh-bits for use in those old releases
where GnuTLS won't tell us how many we should use.
Change the on-disk filename for generated D-H params again, replacing
the -normal with -<bitcount>, so that it's 1024 or whatever, and as
the value changes, Exim will automatically start using the new value.
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GnuTLS code re-done, using cut&paste for preservation where appropriate.
Stop using deprecated APIs. Stop hard-coding lists of ciphers.
Use gnutls_priority_init() instead.
Turns tls_require_ciphers into a string in the GnuTLS case, not just
OpenSSL case.
Deprecate three gnutls_require_* options; now ignored but not errors.
(No warnings yet).
Added TLS SNI support.
Made the channel binding integration theoretically actually work. I had
it guarded by an #ifdef but the value used was an enum instead. Oops.
Fixed.
New code much more amenable to future work permitting TLS in callouts.
DH param sizes now chosen by GnuTLS maintainers, we use "normal"; that's
suddenly a lot more bits, so the saved filename was changed too.
(GNUTLS_SEC_PARAM_NORMAL).
DH param setup only done for servers now, since clients don't need/use
it.
GnuTLS a lot more robust to library negotiation using stuff we don't
support, error-ing out quickly for other authentication systems (PGP,
etc).
Renamed pseudo_random_number() to vaguely_random_number() which makes
the nature clearer.
GnuTLS now provides a vaguely_random_number() implementation, to match
OpenSSL.
Pull in <inttypes.h> to make the recent arithmetic changes compile on
MacOS.
Nuke test 2011 which related to the gnutls_require_* options now
non-functional.
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Remove a couple of stray references to PCRE_CFLAGS too (dating from when PCRE was bundled).
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OpenSSL only.
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Some discussion at http://bugs.exim.org/show_bug.cgi?id=817
Refer readers to Dan Bernstein's analysis of the issues.
Consensus seen from maintainers is that DJB is right on this point.
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tls_sni as SMTP transport option.
Use correct storage pool for copying tls_sni, so survives for life of process.
Add +tls_sni log-selector, for inbound tls_sni.
Update exipick to handle -tls_sni in spool files.
Also reset tls_bits at start of outbound connection (was missing).
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Drop SSL_clear() after SSL_new() which causes protocol negotiation failures for TLS1.0 vs TLS1.1/1.2 in OpenSSL 1.0.1b.
Remove SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS (+dont_insert_empty_fragments) from default of openssl_options.
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Point 1 for 4.78 said gsasl could *not* be used to replace cyrus.
This was obsoleted by point 5.
Remove claim from point 1, add additional note to point 5.
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Patch from John Horne.
Fixes bug 1078
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Permits SSL-on-connect for outbound connections.
Heavily based on Simon Arlott's patch, but with enough modifications to
risk new bugs.
nb: am on a plane, change confirmed to compile on MacOS, nothing more
fixes bug 97
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I have also de-CVSed the ABOUT files and cleaned up a few
introductory comments.
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fixes bug 1111
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