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    • Benjamin Kaduk's avatar
      Improve backwards compat for SSL_get_servername() · a75be9fd
      Benjamin Kaduk authored
      Commit 1c4aa31d
      
       changed how we process
      and store SNI information during the handshake, so that a hostname is
      only saved in the SSL_SESSION structure if that SNI value has actually
      been negotiated.  SSL_get_servername() was adjusted to match, with a new
      conditional being added to handle the case when the handshake processing
      is ongoing, and a different location should be consulted for the offered
      SNI value.  This was done in an attempt to preserve the historical
      behavior of SSL_get_servername(), a function whose behavior only mostly
      matches its documentation, and whose documentation is both lacking and
      does not necessarily reflect the actual desired behavior for such an
      API.  Unfortunately, sweeping changes that would bring more sanity to
      this space are not possible until OpenSSL 1.2.0, for ABI compatibility
      reasons, so we must attempt to maintain the existing behavior to the
      extent possible.
      
      The above-mentioned commit did not take into account the behavior
      of SSL_get_servername() during resumption handshakes for TLS 1.2 and
      prior, where no SNI negotiation is performed.  In that case we would
      not properly parse the incoming SNI and erroneously return NULL as
      the servername, when instead the logical session is associated with
      the SNI value cached in the SSL_SESSION.  (Note that in some cases an
      SNI callback may not need to do anything in a TLS 1.2 or prior resumption
      flow, but we are calling the callbacks and did not provide any guidance
      that they should no-op if the connection is being resumed, so we must
      handle this case in a usable fashion.)  Update our behavior accordingly to
      return the session's cached value during the handshake, when resuming.
      This fixes the boringssl tests.
      
      [extended tests]
      
      Reviewed-by: default avatarRichard Levitte <levitte@openssl.org>
      (Merged from https://github.com/openssl/openssl/pull/6792)
      a75be9fd