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Could not find an API for use with OpenSSL, so GnuTLS only
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This reverts commit 83f4c7515f3eb06dc070e78edd2694c1d088e5fd.
This was not a new check! The call to gnutls_dh_set_prime_bits() was
made with DH_BITS in Exim 4.77, so the only difference is that now an
administrator can choose at compile time to change the lower bound.
So keeping this at 1024 is not a regression and if we can't talk to them
now, we couldn't before, and we shouldn't lower security by default.
The reverted commit was only acceptable IF it was still better than what
we had in Exim 4.77.
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Wolfgang Breyha saw a real-world site using 768 bits.
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Jeremy wrote this, mostly; I just fixed up a comment and pedantically numbered the enum values
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Exim thought protection layer was required, which is not implemented.
Patch from Wolfgang Breyha.
Fixes bug 1254
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Ignore more build side effects
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As suggested by Dennis Davis to fix an error with gcc 2.95.2
which threw the following error:-
gcc pdkim.c
pdkim.c: In function `pdkim_feed_finish':
pdkim.c:1389: parse error before `*'
pdkim.c:1390: `hdrs' undeclared (first use in this function)
pdkim.c:1390: (Each undeclared identifier is reported only once
pdkim.c:1390: for each function it appears in.)
gmake[2]: *** [pdkim.o] Error 1
See https://lists.exim.org/lurker/message/20120524.094800.89928246.en.html
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_ISOC99_SOURCE broke build on Linux (Ubuntu 11.10) because it broke <resolv.h>, <arpa/nameser.h>, etc.
Their u_char and u_int usage relies upon BSD source being enabled too. So use _GNU_SOURCE.
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Done before os.h is pulled in so an OS can override it.
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With this, src/EDITME as Local/Makefile *only* needs EXIM_USER to be
set and EXIM_MONITOR commented out for Exim to build on my box.
I think this is a reasonable default; if there are releases of PCRE which
do not include pcre-config, then on those boxes a slight change will be
needed, but only where the file was already having to be edited anyway.
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Report and point to fix from Dennis Davis.
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Rough text per suggestion from Tony.
Amended ACKNOWLEDGEMENTS briefly, but need to actually add people. Like, er, me.
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gnutls_dh_params_export_pkcs3() returns 2 different sizes.
NUL observed by Janne Snabb
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Pull in <features.h> on Linux.
Switch readconf log from D_all (bug) to D_tls (though D_any would have
worked).
Modified runtest to handle clamped DH bits and
tls_validate_require_cipher added debug logging.
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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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Guarded the callback invocation on OpenSSL having TLS extension support.
Failed to guard the callback definition. Fixed.
Problem spotted by Todd Lyons.
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Noted by Moritz Wilhelmy.
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Confirmed typo, rather than QNXism, by grepping tree and finding no
other instances.
Reported by René Berber.
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WANT_DEEPER_PRINTF_CHECKS guards ALMOST_PRINTF being PRINTF_FUNCTION.
Fix some actual issues exposed when I cut down on the spam.
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Report and fix from Michael Haardt.
The resolver library change's assumed typedef was absent, but the
underlying struct __res_state is present. Long type issues for the
arithmetic changes.
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Only crash-plausible issue would require the Cambridge-specific
iplookup router and a misconfiguration.
Report from Marcin Mirosław
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De-initialised "type" var in stack declaration, so a repeat of this mistake
would lead to an uninitialized variable usage warning which would have blocked
the previous incorrect fix from being committed.
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(stack memory referenced, read-only, out of scope).
Patch from Wolfgang Breyha, report from Stuart Northfield.
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Patch from Janne Snabb.
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Fixed assumption that tls_certificate non-NULL in server when TLS
advertised.
Weakened an !S_ISREG() to an S_ISDIR() to keep the test-suite happy.
Using:
do { rc = gnutls_handshake(state->session);
} while ((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED));
is contra-indicated when you expect SIGALRM to be able to break you out
of the loop. A little _too_ robust there. Switching last part to:
(rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen)
is rather more productive.
Only test not passing is 2025, which makes major assumptions about
cipher suites and needs to be revisited to see what it's trying to
achieve. We fail the test because we successfully deliver the message
without expected errors, because other ciphersuites are available, since
we're no longer limited to a *very* short list embedded in the Exim
code. That sort of failure I can live with.
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A couple more cert1/2 strings updated, plus some disambiguating rhubarb.
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Some tests had not been updated for the new cert because they were missing an X= log-line.
Updated those tests now.
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