A split SSL handshake may involve 2 binaries, potentially built at
different versions: call them the "handoff/handback" binary and the
"handshake" binary. We would like to guarantee that the
handoff/handback binary does not make any promises that the handshake
binary cannot keep.
As a start, this commit serializes |kCiphers| to the handoff message.
When the handoff message is applied to an |SSL|, any configured
ciphers not listed in the handoff message will be removed, in order to
prevent them from being negotiated.
Subsequent commits will apply the same approach to other lists of features.
Change-Id: Idf6dbeadb750c076ab0509c09b9d3f22eb162b9c
Reviewed-on: https://boringssl-review.googlesource.com/c/29264
Reviewed-by: Matt Braithwaite <mab@google.com>
- In base.h, if BORINGSSL_PREFIX is defined, include
boringssl_prefix_symbols.h
- In all .S files, if BORINGSSL_PREFIX is defined, include
boringssl_prefix_symbols_asm.h
- In base.h, BSSL_NAMESPACE_BEGIN and BSSL_NAMESPACE_END are
defined with appropriate values depending on whether
BORINGSSL_PREFIX is defined; these macros are used in place
of 'namespace bssl {' and '}'
- Add util/make_prefix_headers.go, which takes a list of symbols
and auto-generates the header files mentioned above
- In CMakeLists.txt, if BORINGSSL_PREFIX and BORINGSSL_PREFIX_SYMBOLS
are defined, run util/make_prefix_headers.go to generate header
files
- In various CMakeLists.txt files, add "global_target" that all
targets depend on to give us a place to hook logic that must run
before all other targets (in particular, the header file generation
logic)
- Document this in BUILDING.md, including the fact that it is
the caller's responsibility to provide the symbol list and keep it
up to date
- Note that this scheme has not been tested on Windows, and likely
does not work on it; Windows support will need to be added in a
future commit
Change-Id: If66a7157f46b5b66230ef91e15826b910cf979a2
Reviewed-on: https://boringssl-review.googlesource.com/31364
Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
Update-Note: SSL_CTX_set_min_proto_version(SSL3_VERSION) now fails.
SSL_OP_NO_SSLv3 is now zero. Internal SSL3-specific "AEAD"s are gone.
Change-Id: I34edb160be40a5eea3e2e0fdea562c6e2adda229
Reviewed-on: https://boringssl-review.googlesource.com/29444
Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: Adam Langley <agl@google.com>
And since there are now 3 different points in the state machine where
a handback can occur, introduce an enum to describe them.
Change-Id: I41866214c39d27d1bbd965d28eb122c0e1f9902a
Reviewed-on: https://boringssl-review.googlesource.com/28344
Commit-Queue: Matt Braithwaite <mab@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
Found by fuzzing.
Change-Id: I831f7869b16486eef7ac887ee199450e38461086
Reviewed-on: https://boringssl-review.googlesource.com/28044
Commit-Queue: Matt Braithwaite <mab@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
Along the way, check the version against the cipher to make sure the
combination is possible.
(Found by fuzzing: a bad version trips an assert.)
Change-Id: Ib0a284fd5fd9b7ba5ceba63aa6224966282a2cb7
Reviewed-on: https://boringssl-review.googlesource.com/27265
Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
|SSL_CONFIG| is a container for bits of configuration that are
unneeded after the handshake completes. By default it is retained for
the life of the |SSL|, but it may be shed at the caller's option by
calling SSL_set_shed_handshake_config(). This is incompatible with
renegotiation, and with SSL_clear().
|SSL_CONFIG| is reachable by |ssl->config| and by |hs->config|. The
latter is always non-NULL. To avoid null checks, I've changed the
signature of a number of functions from |SSL*| arguments to
|SSL_HANDSHAKE*| arguments.
When configuration has been shed, setters that touch |SSL_CONFIG|
return an error value if that is possible. Setters that return |void|
do nothing.
Getters that request |SSL_CONFIG| values will fail with an |assert| if
the configuration has been shed. When asserts are compiled out, they
will return an error value.
The aim of this commit is to simplify analysis of split-handshakes by
making it obvious that some bits of state have no effects beyond the
handshake. It also cuts down on memory usage.
Of note: |SSL_CTX| is still reachable after the configuration has been
shed, and a couple things need to be retained only for the sake of
post-handshake hooks. Perhaps these can be fixed in time.
Change-Id: Idf09642e0518945b81a1e9fcd7331cc9cf7cc2d6
Bug: 123
Reviewed-on: https://boringssl-review.googlesource.com/27644
Commit-Queue: David Benjamin <davidben@google.com>
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These are connection state, so they should be reset on SSL_clear.
Change-Id: I861fe52578836615d2719c9e1ff0911c798f336e
Reviewed-on: https://boringssl-review.googlesource.com/27384
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Steven Valdez <svaldez@google.com>
In the handoff+handback case, bssl_shim.cc creates 3 |SSL| objects:
one to receive the ClientHello, one to receive the handoff, and a
third one to receive the handback.
Before 56986f9, only the first of these received any configuration.
Since that commit, all 3 of them receive the same configuration. That
means that the handback message no longer needs to serialize as many
things.
N.B. even before 56986f9, not all of the fields were necessary. For
example, there was no reason to serialize |conf_max_version| and
|conf_min_version| in the handback, so far as I can tell.
This commit is mechanical: it simply removes everything that doesn't
cause any tests to fail. In the long run, I'll need to carefully
check for two possibilities:
- Knobs that affect the handshake after the server's first message it
sent. These are troublesome because that portion of the handshake
may run on a different |SSL|, depending on whether the handback is
early or late.
- Getters that may be called post-handshake, and that callers may
reasonably expect to reflect the value that was used during
handshake.
(I'm not sure that either case exists!)
Change-Id: Ibf6e0be6609ad6e83ab50e69199e9b2d51e59a87
Reviewed-on: https://boringssl-review.googlesource.com/27364
Commit-Queue: Matt Braithwaite <mab@google.com>
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Reviewed-by: David Benjamin <davidben@google.com>
(Found by fuzzing: a zero value causes an infinite loop.)
Change-Id: I984fd88d85fb87616b5e806795c10334f4379744
Reviewed-on: https://boringssl-review.googlesource.com/27345
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This changes the contract for split handshakes such that on the
receiving side, the connection is to be driven until it returns
|SSL_ERROR_HANDBACK|, rather than until SSL_do_handshake() returns
success.
Change-Id: Idd1ebfbd943d88474d7c934f4c0ae757ff3c0f37
Reviewed-on: https://boringssl-review.googlesource.com/26864
Commit-Queue: Matt Braithwaite <mab@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Split handshakes allows the handshaking of a TLS connection to be
performed remotely. This encompasses not just the private-key and ticket
operations – support for that was already available – but also things
such as selecting the certificates and cipher suites.
The the comment block in ssl.h for details. This is highly experimental
and will change significantly before its settled.
Change-Id: I337bdfa4c3262169e9b79dd4e70b57f0d380fcad
Reviewed-on: https://boringssl-review.googlesource.com/25387
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
