Fix CT test_sslmessages hangs

The CT tests in test_sslmessages require EC to be available, therefore
we must skip these if no-ec

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2153)

Fix compilation with no-ec

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2153)

Fix extension for various no- options

Previously we were omitting the extension information from ext_defs if
the association no- option was defined. This doesn't work because the
indexes into the table are no longer valid.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2153)

Add a test to check the EC point formats extension appears when we expect

The previous commit fixed a bug where the EC point formats extensions did
not appear in the ServerHello. This should have been caught by
70-test_sslmessages but that test never tries an EC ciphersuite. This
updates the test to do that.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2153)

Fix the EC point formats extension

This should be sent in the ServerHello if a EC based ciphersuite is
negotiated. The relevant flag to do this was missed off in the recent
extensions refactor.

Fixes GitHub Issue #2133

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2153)

replace "will lookup up" by "will look up"

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
CLA: trivial
(Merged from https://github.com/openssl/openssl/pull/2145)

chacha/asm/chacha-x86_64.pl: add AVX512 path optimized for shorter inputs.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix EVP_MD_meth_get_flags

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2134)

Travis: The TLS 1.3 code isn't interoperable yet, move it to its own build

We should move it back to the BORINGTEST build when we are approaching
interoperability.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2123)

Reformat M_check_autoarg to match our coding style

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2121)

M_check_autoarg: sanity check the key

For now, checking that the size is non-zero will suffice.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2120)

Add bwrite_conv and bread_conv values to methods_dgramp_sctp

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2116)

Fix erroneous goto lable

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2116)

x86 assembly pack: update performance results.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Update fuzz corpora

Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #2090

Fix memory leak in tls_parse_stoc_key_share

Found by oss-fuzz

Reviewed-by: Richard Levitte <levitte@openssl.org>
GH: #2102

Fix typo.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
CLA: trivial
(Merged from https://github.com/openssl/openssl/pull/2086)

test/ssl_test: give up if both client and server wait on read

In some cases, both client and server end of the test can end up in
SSL_ERROR_WANT_READ and never get out of it, making the test spin.
Detect it and give up instead of waiting endlessly.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2096)

Fix no-ct, skip tests recipes that try to test CT

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2096)

e_afalg: Don't warn about kernel version when pedantic

When built with --strict-warnings and the Linux kernel headers don't
match the kernel version, the preprocessor warnings in
engines/afalg/e_afalg.c cause compilation errors.  Use the macro
PEDANTIC to avoid those warnings in that case.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2095)

evp_test: when function and reason strings aren't available, just skip

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2093)

HP-UX doesn't have hstrerror(), so make our own for that platform

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2092)
(cherry picked from commit 46766d003666da5f90346da7e6d09e109355f5c6)

Make client and server fuzzer support all ciphers

Also send a SNI extension in the client so the fuzzer can react to it.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2088

Document the recommended parameters for fuzzing

We use those parameters for calculating the coverage.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2088

Enable TLS1.3 and PEDANTIC in the coverage target

This make sure that the coverage is the same for the fuzzers and this
coverage target

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2088

Don't call memcpy with NULL as source

Calling it with lenght 0 and NULL as source is undefined behaviour.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2089

poly1305/asm/poly1305-x86_64.pl: allow nasm to assemble AVX512 code.
chacha/asm/chacha-x86_64.pl: refine nasm version detection logic.

Reviewed-by: Richard Levitte <levitte@openssl.org>

perlasm/x86_64-xlate.pl: add support for AVX512 OPMASK-ing.

Reviewed-by: Richard Levitte <levitte@openssl.org>

man3/OPENSSL_ia32cap.pod: clarify AVX512 support in clang context.

Reviewed-by: Richard Levitte <levitte@openssl.org>

CRL critical extension bugfix

More importantly, port CRL test from boringSSL crypto/x509/x509_test.cc

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1775)

Add function and reason checking to evp_test

Add options to check the function and reason code matches expected values.

Reviewed-by: Richard Levitte <levitte@openssl.org>

Add X509_VERIFY_PARAM inheritance flag set/get

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2079)

Fix various doc nits.

find-doc-nits warns if you don't give a "what to do flag"
Don't use regexps for section names, just strings:  More consistency.
Rename "COMMAND OPTIONS" to OPTIONS.
Fix a couple of other nit-level things.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2076)

Remove ENGINE_load_dasync() (no OPENSSL_INIT_ENGINE_DASYNC already)

Fixes: 8d00e30f96fb86b20bc992f626b188c3548fc58c ("Don't try to init
dasync internally")

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial

Typo fixed

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2075)

updated macro spacing for styling purposes

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial

fix undoes errors introduced by https://github.com/openssl/openssl/commit/fc6076ca272f74eb1364c29e6974ad5da5ef9777?diff=split#diff-1014acebaa2c13d44ca196b9a433ef2eR184

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial

Restore the ERR_FATAL_ERROR() macro

Commit 0cd0a820abc6124cf8e176fa92d620a2abf9e419 removed this macro
along with many unused function and reason codes; ERR_FATAL_ERROR()
was not used in the tree, but did have external consumers.

Add it back to restore the API compatibility and avoid breaking
applications for no internal benefit.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2049)

Fix a leak in SSL_clear()

SSL_clear() was resetting numwpipes to 0, but not freeing any allocated
memory for existing write buffers.

Fixes #2026

Reviewed-by: Rich Salz <rsalz@openssl.org>

perlasm/x86_64-xlate.pl: refine sign extension in ea package.

$1<<32>>32 worked fine with either 32- or 64-bit perl for a good while,
relying on quirk that [pure] 32-bit perl performed it as $1<<0>>0. But
this apparently changed in some version past minimally required 5.10,
and operation result became 0. Yet, it went unnoticed for another while,
because most perl package providers configure their packages with
-Duse64bitint option.

Reviewed-by: Rich Salz <rsalz@openssl.org>

x86_64 assembly pack: add AVX512 ChaCha20 and Poly1305 code paths.

Reviewed-by: Rich Salz <rsalz@openssl.org>

poly1305/poly1305_base2_44.c: add reference base 2^44 implementation.

Reviewed-by: Rich Salz <rsalz@openssl.org>

Avoid the call to OPENSSL_malloc with a negative value (then casted to unsigned)

CLA: trivial
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2021)

Fix reference to SSL_set_max_proto_version.

CLA: trivial
Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2059)

Additional error tests in evp_test.c

Support checking for errors during test initialisation and parsing.

Add errors and tests for key operation initalisation and ctrl errors.

Reviewed-by: Rich Salz <rsalz@openssl.org>

VMS UI_OpenSSL: generate OpenSSL errors when things go wrong.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2063)

VMS UI_OpenSSL: if the TT device isn't a tty, flag instead of error

On all platforms, if the controlling tty isn't an actual tty, this is
flagged by setting is_a_tty to zero...  except on VMS, where this was
treated as an error.  Change this to behave like the other platforms.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2063)

Add RSA PSS tests

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2065)

Check input length to pkey_rsa_verify()

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2065)

Update client fuzz corpus

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2060

Test framework: Add the possibility to have a test specific data dir

This data directory is formed automatically by taking the recipe name
and changing '.t' to '_data'.  Files in there can be reached with the
new function data_file()

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2027)

Update client fuzzer corpus

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2053

Remove extra bang

A bang (!) slipped through in the recent UI cleanup

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2051)

Only call memcpy when the length is larger than 0.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2050

UI code style cleanup

Mostly condition check changes.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2047)

Fuzz corpora update

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2041

And client fuzzer

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2041

Make the predictable numbers start from 1

There is code that retries calling RAND_bytes() until it gets something
other than 0, which just hangs if we always return 0.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2041

Make asn1 fuzzer more reproducible

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2041

Fix the declaration of tls_parse_extension in statem_locl.h

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix a travis failure

Travis was indicating a bogus uninit var warning. This fixes it.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix various indentation

The indentation was a bit off in some of the perl files following the
extensions refactor.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move the checkhandshake.pm module into test/testlib

Move this module into the same place as other test helper modules. It
simplifies the code and keeps like things together.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix make update issues

Various functions got renamed. We need to rename the error codes too.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix more style issues following extensions refactor feedback

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Introduce TLSEXT_STATUSTYPE_nothing constant

The existing code used the magic number -1 to represent the absence of
a status_type in the extension. This commit replaces it with a macro.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Change TLSEXT_IDX_* values into an enum

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Various style updates following extensions refactor

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix travis mixed declarations and code error

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Suppress some BoringSSL test failures

The external BoringSSL tests had some failures as a result of
the extensions refactor. This was due to a deliberate relaxation
of the duplicate extensions checking code. We now only check
known extensions for duplicates. Unknown extensions are ignored.
This is allowed behaviour, so we suppress those BoringSSL tests.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Correct imports for checkhandshake module

Ensure the tests can find the checkhandshake module on all platforms

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix a memory leak

When we call tls_collect_extensions() we need to free up the raw
extensions data later.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add some extra key_share tests

Check that the extension framework properly handles extensions specific
to a protocol version

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Remove some spurious whitespace

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add a renegotiation test

Make sure we did not break the unsafe legacy reneg checks with the extension
work.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add more extension tests to test_sslmessages

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Merge common code between test_tls13messages and test_sslmessages

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add extension tests in test_sslmessages

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Enable status_request test in test_sslmessages

The s_server option -status_file has been added so this test can be
enabled.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Fix a bug in TLSProxy where zero length messages were not being recorded

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add a test to check messsages sent are the ones we expect

Repeat for various handshake types

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Support renegotiation in TLSProxy

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add tests for new extension code

Extend test_tls13messages to additionally check the expected extensions
under different options given to s_client/s_server.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Split ServerHello extensions

In TLS1.3 some ServerHello extensions remain in the ServerHello, while
others move to the EncryptedExtensions message. This commit performs that
move.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move ServerHello extension parsing into the new extension framework

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Avoid repeatedly scanning the list of extensions

Because extensions were keyed by type which is sparse, we were continually
scanning the list to find the one we wanted. The way we stored them also
had the side effect that we were running initialisers/finalisers in a
different oder to the parsers. In this commit we change things so that we
instead key on an index value for each extension.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Simplify ClientHello extension parsing

Remove some functions that are no longer needed now that we have the new
extension framework.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move ALPN processing into an extension finalisation function

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Provide server side extension init and finalisation functions

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add an extension initilisation and finalisation capability

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move client construction of ClientHello extensions into new framework

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move client parsing of ServerHello extensions into new framework

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Rename some functions

The _clienthello_ in the extensions parsing functions is overly specific.
Better to keep the convention to just _client_

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Move ServerHello extension construction into the new extensions framework

This lays the foundation for a later move to have the extensions built and
placed into the correct message for TLSv1.3 (e.g. ServerHello or
EncryptedExtensions).

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Split extensions code into core extensions and server extensions code

Later we will have client extensions code too.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add extensions construction support

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Continue the extensions refactor

Add support for construction of extensions

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Refactor ClientHello extension parsing

This builds on the work started in 1ab3836b3 and extends is so that
each extension has its own identified parsing functions, as well as an
allowed context identifying which messages and protocols it is relevant for.
Subsequent commits will do a similar job for the ServerHello extensions.
This will enable us to have common functions for processing extension blocks
no matter which of the multiple messages they are received from. In TLSv1.3
a number of different messages have extension blocks, and some extensions
have moved from one message to another when compared to TLSv1.2.

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Verify that extensions are used in the correct context

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Add some missing extensions to SSL_extension_supported()

Perl changes reviewed by Richard Levitte. Non-perl changes reviewed by Rich
Salz

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>