Add SSL_CTX early callback

Provide a callback interface that gives the application the ability
to adjust the nascent SSL object at the earliest stage of ClientHello
processing, immediately after extensions have been collected but
before they have been processed.

This is akin to BoringSSL's "select_certificate_cb" (though it is not
API compatible), and as the name indicates, one major use is to examine
the supplied server name indication and select what certificate to
present to the client.  However, it can also be used to make more
sweeping configuration changes to the SSL object according to the
selected server identity and configuration.  That may include adjusting
the permitted TLS versions, swapping out the SSL_CTX object (as is
traditionally done in a tlsext_servername_callback), changing the
server's cipher list, and more.

We also wish to allow an early callback to indicate that it needs to perform
additional work asynchronously and resume processing later.  To that effect,
refactor the second half of tls_process_client_hello() into a subroutine to be
called at the post-processing stage (including the early callback itself), to
allow the callback to result in remaining in the same work stage for a later
call to succeed.  This requires allocating for and storing the CLIENTHELLO_MSG
in the SSL object to be preserved across such calls, but the storage is
reclaimed after ClientHello processing finishes.

Information about the CliehtHello is available to the callback by means of
accessor functions that can only be used from the early callback.  This allows
extensions to make use of the existing internal parsing machinery without
exposing structure internals (e.g., of PACKET), so that applications do not
have to write fragile parsing code.

Applications are encouraged to utilize an early callback and not use
a servername_callback, in order to avoid unexpected behavior that
occurs due to the relative order of processing between things like
session resumption and the historical servername callback.

Also tidy up nearby style by removing unnecessary braces around one-line
conditional bodies.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2279)

1 files changed, 8 insertions, 0 deletions

diff --git a/util/libssl.num b/util/libssl.num
index 7f5100290b..20642ce758 100644
--- a/util/libssl.num
+++ b/util/libssl.num
@@ -416,3 +416,11 @@ SSL_get_peer_signature_type_nid         416	1_1_1	EXIST::FUNCTION:
 SSL_key_update                          417	1_1_1	EXIST::FUNCTION:
 SSL_get_key_update_type                 418	1_1_1	EXIST::FUNCTION:
 SSL_bytes_to_cipher_list                419	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_compression_methods      420	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_ciphers                  421	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_ext                      422	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_session_id               423	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_random                   424	1_1_1	EXIST::FUNCTION:
+SSL_CTX_set_early_cb                    425	1_1_1	EXIST::FUNCTION:
+SSL_early_get0_legacy_version           426	1_1_1	EXIST::FUNCTION:
+SSL_early_isv2                          427	1_1_1	EXIST::FUNCTION: