TLS 1.3 includes a server-random-based anti-downgrade signal, as a
workaround for TLS 1.2's ServerKeyExchange signature failing to cover
the entire handshake. However, because TLS 1.3 draft versions are each
doomed to die, we cannot deploy it until the final RFC. (Suppose a
draft-TLS-1.3 client checked the signal and spoke to a final-TLS-1.3
server. The server would correctly negotiate TLS 1.2 and send the
signal. But the client would then break. An anologous situation exists
with reversed roles.)
However, it appears that Cisco devices have non-compliant TLS 1.2
implementations[1] and copy over another server's server-random when
acting as a TLS terminator (client and server back-to-back).
Hopefully they are the only ones doing this. Implement a
measurement-only version with a different value. This sentinel must not
be enforced, but it will tell us whether enforcing it will cause
problems.
[1] https://www.ietf.org/mail-archive/web/tls/current/msg25168.html
Bug: 226
Change-Id: I976880bdb2ef26f51592b2f6b3b97664342679c8
Reviewed-on: https://boringssl-review.googlesource.com/24284
Commit-Queue: David Benjamin <davidben@google.com>
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Reviewed-by: Adam Langley <agl@google.com>
This is connection state, not configuration, so it must live on
ssl->s3, otherwise SSL_clear will be confused.
Change-Id: Id7c87ced5248d3953e37946e2d0673d66bfedb08
Reviewed-on: https://boringssl-review.googlesource.com/24264
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
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As with SSLTranscript before, we temporarily need some nastiness in
SSL3_STATE, but this is in preparation of giving SSL3_STATE a
constructor and destructor.
Change-Id: Ifc0ce34fdcd8691d521d8ea03ff5e83dad43b4a3
Reviewed-on: https://boringssl-review.googlesource.com/21944
Reviewed-by: Steven Valdez <svaldez@google.com>
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Enough were to make record processing idempotent (we either consume a
record or we don't), but some errors would cause us to keep processing
records when we should get stuck.
This leaves errors in the layer between the record bits and the
handshake. I'm hoping that will be easier to resolve once they do not
depend on BIO, at which point the checks added in this CL may move
around.
Bug: 206
Change-Id: I6b177079388820335e25947c5bd736451780ab8f
Reviewed-on: https://boringssl-review.googlesource.com/21366
Commit-Queue: Steven Valdez <svaldez@google.com>
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Right now we report the per-connection value during the handshake and
the per-session value after the handshake. This also trims our tickets
slightly by removing a largely unused field from SSL_SESSION.
Putting it on SSL_HANDSHAKE would be better, but sadly a number of
bindings-type APIs expose it after the handshake.
Change-Id: I6a1383f95da9b1b141b9d6adadc05ee1e458a326
Reviewed-on: https://boringssl-review.googlesource.com/20064
Commit-Queue: David Benjamin <davidben@google.com>
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That's the last of it!
Change-Id: I93d1f5ab7e95b2ad105c34b24297a0bf77625263
Reviewed-on: https://boringssl-review.googlesource.com/19784
Reviewed-by: David Benjamin <davidben@google.com>
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The previous attempt around the 'struct ssl_st' compatibility mess
offended OSS-Fuzz and UBSan because one compilation unit passed a
function pointer with ssl_st* and another called it with
bssl::SSLConnection*.
Linkers don't retain such types, of course, but to silence this alert,
instead make C-visible types be separate from the implementation and
subclass the public type. This does mean we risk polluting the symbol
namespace, but hopefully the compiler is smart enough to inline the
visible struct's constructor and destructor.
Bug: 132
Change-Id: Ia75a89b3a22a202883ad671a630b72d0aeef680e
Reviewed-on: https://boringssl-review.googlesource.com/18224
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
This adds several utilities as replacements for new and delete and makes
bssl::UniquePtr work with our private types.
Later work can convert more incrementally. I did this one more
aggressively to see how it'd work. Unfortunately, in doing so, I needed
to remove the NULL SSL_AEAD_CTX "method" receiver trick to appease
clang. The null cipher is now represented by a concrete SSL_AEAD_CTX.
The long-lived references to SSL_AEAD_CTX are not yet in types with
constructors, so they still bare Delete rather than UniquePtr for now.
Though this does mean we may be able to move the sequence number into
SSLAEADContext later which is one less object for DTLS to carry around.
Bug: 132
Change-Id: I506b404addafb692055d5709b0ca6d5439a4e6be
Reviewed-on: https://boringssl-review.googlesource.com/18164
Reviewed-by: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
This is horrible, but everything else I tried was worse. The goal with
this CL is to take the extern "C" out of ssl/internal.h and move most
symbols to namespace bssl, so we can start using C++ helpers and
destructors without worry.
Complications:
- Public API functions must be extern "C" and match their declaration in
ssl.h, which is unnamespaced. C++ really does not want you to
interleave namespaced and unnamespaced things. One can actually write
a namespaced extern "C" function, but this means, from C++'s
perspective, the function is namespaced. Trying to namespace the
public header would worked but ended up too deep a rabbithole.
- Our STACK_OF macros do not work right in namespaces.
- The typedefs for our exposed but opaque types are visible in the
header files and copied into consuming projects as forward
declarations. We ultimately want to give SSL a destructor, but
clobbering an unnamespaced ssl_st::~ssl_st seems bad manners.
- MSVC complains about ambiguous names if one typedefs SSL to bssl::SSL.
This CL opts for:
- ssl/*.cc must begin with #define BORINGSSL_INTERNAL_CXX_TYPES. This
informs the public headers to create forward declarations which are
compatible with our namespaces.
- For now, C++-defined type FOO ends up at bssl::FOO with a typedef
outside. Later I imagine we'll rename many of them.
- Internal functions get namespace bssl, so we stop worrying about
stomping the tls1_prf symbol. Exported C functions are stuck as they
are. Rather than try anything weird, bite the bullet and reorder files
which have a mix of public and private functions. I expect that over
time, the public functions will become fairly small as we move logic
to more idiomatic C++.
Files without any public C functions can just be written normally.
- To avoid MSVC troubles, some bssl types are renamed to CPlusPlusStyle
in advance of them being made idiomatic C++.
Bug: 132
Change-Id: Ic931895e117c38b14ff8d6e5a273e868796c7581
Reviewed-on: https://boringssl-review.googlesource.com/18124
Reviewed-by: David Benjamin <davidben@google.com>
http://i1.kym-cdn.com/photos/images/original/000/242/631/382.gif
In the first step, switch C files to C++ individually, keeping
everything in internal.h C-compatible. We'll make minimal changes needed
to get things compiling (notably a lot of goto errs will need to turn to
bssl::UniquePtr right away), but more aggressive changes will happen in
later steps.
(To avoid a rebase, I'm intentionally avoiding files that would conflict
with CLs in flight right now.)
Bug: 132
Change-Id: Id4cfd722e7b57d1df11f27236b4658b5d39b5fd2
Reviewed-on: https://boringssl-review.googlesource.com/17667
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This follows up on cedc6f18 by removing support for the
-DBORINGSSL_ENABLE_DHE_TLS compile flag, and the code needed to
support it.
Change-Id: I53b6aa7a0eddd23ace8b770edb2a31b18ba2ce26
Reviewed-on: https://boringssl-review.googlesource.com/14886
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This lets us trim another two pointers of per-connection state.
Change-Id: I2145d529bc25b7e24a921d01e82ee99f2c98867c
Reviewed-on: https://boringssl-review.googlesource.com/13804
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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Change-Id: I98903df561bbf8c5739f892d2ad5e89ac0eb8e6f
Reviewed-on: https://boringssl-review.googlesource.com/13369
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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On the TLS side, we introduce a running buffer of ciphertext. Queuing up
pending data consists of encrypting the record into the buffer. This
effectively reimplements what the buffer BIO was doing previously, but
this resizes to fit the whole flight.
As part of this, rename all the functions to add to the pending flight
to be more uniform. This CL proposes "add_foo" to add to the pending
flight and "flush_flight" to drain it.
We add an add_alert hook for alerts but, for now, only the SSL 3.0
warning alert (sent mid-handshake) uses this mechanism. Later work will
push this down to the rest of the write path so closure alerts use it
too, as in DTLS. The intended end state is that all the ssl_buffer.c and
wpend_ret logic will only be used for application data and eventually
optionally replaced by the in-place API, while all "incidental" data
will be handled internally.
For now, the two buffers are mutually exclusive. Moving closure alerts
to "incidentals" will change this, but flushing application data early
is tricky due to wpend_ret. (If we call ssl_write_buffer_flush,
do_ssl3_write doesn't realize it still has a wpend_ret to replay.) That
too is all left alone in this change.
To keep the diff down, write_message is retained for now and will be
removed from the state machines in a follow-up change.
BUG=72
Change-Id: Ibce882f5f7196880648f25d5005322ca4055c71d
Reviewed-on: https://boringssl-review.googlesource.com/13224
Reviewed-by: Adam Langley <agl@google.com>
Most C standard library functions are undefined if passed NULL, even
when the corresponding length is zero. This gives them (and, in turn,
all functions which call them) surprising behavior on empty arrays.
Some compilers will miscompile code due to this rule. See also
https://www.imperialviolet.org/2016/06/26/nonnull.html
Add OPENSSL_memcpy, etc., wrappers which avoid this problem.
BUG=23
Change-Id: I95f42b23e92945af0e681264fffaf578e7f8465e
Reviewed-on: https://boringssl-review.googlesource.com/12928
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
There are no longer any consumers of these APIs.
These were useful back when the CBC vs. RC4 tradeoff varied by version
and it was worth carefully tuning this cutoff. Nowadays RC4 is
completely gone and there's no use in configuring these anymore.
To avoid invalidating the existing ssl_ctx_api corpus and requiring it
regenerated, I've left the entries in there. It's probably reasonable
for new API fuzzers to reuse those slots.
Change-Id: I02bf950e3828062341e4e45c8871a44597ae93d5
Reviewed-on: https://boringssl-review.googlesource.com/12880
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
This is to free up moving ssl->state into SSL_HANDSHAKE. ssl->state
serves two purposes right now. First, it is the state tracking for
SSL_HANDSHAKE. Second, it lets the system know there is a handshake
waiting to complete.
Instead, arrange things so that, if there is a handshake waiting to
complete, hs is not NULL. That means we need to initialize it when
creating a new connection and when discovering a renego.
Note this means we cannot make initializing an SSL_HANDSHAKE depend on
client vs. server.
Change-Id: I585a8d7e700c4ffe4d372248d34c44106ad7e7a0
Reviewed-on: https://boringssl-review.googlesource.com/12696
Reviewed-by: David Benjamin <davidben@google.com>
s3_lib.c is nearly gone. ssl_get_cipher_preferences will fall away once
we remove the version-specific cipher lists. ssl_get_algorithm_prf and
the PRF stuff in general needs some revising (it was the motivation for
all the SSL_HANDSHAKE business). I've left ssl3_new / ssl3_free alone
for now because we don't have a good separation between common TLS/DTLS
connection state and state internal to the TLS SSL_PROTOCOL_METHOD.
Leaving that alone for now as there's lower-hanging fruit.
Change-Id: Idf7989123a387938aa89b6a052161c9fff4cbfb3
Reviewed-on: https://boringssl-review.googlesource.com/12584
Reviewed-by: Adam Langley <agl@google.com>
Each of these functions is called only once, but they're interspersed
between s3_lib.c and ssl_lib.c.
Change-Id: Ic496e364b091fc8e01fc0653fe73c83c47f690d9
Reviewed-on: https://boringssl-review.googlesource.com/12583
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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It's our ClientHello representation. May as well name it accordingly.
Also switch away from calling the variable name ctx as that conflicts
with SSL_CTX.
Change-Id: Iec0e597af37137270339e9754c6e08116198899e
Reviewed-on: https://boringssl-review.googlesource.com/12581
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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The remaining direct accesses are in functions which expect to be called
in and out of the handshake. Accordingly, they are NULL-checked.
Change-Id: I07a7de6bdca7b6f8d09e22da11b8863ebf41389a
Reviewed-on: https://boringssl-review.googlesource.com/12343
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This changes our resumption strategy. Before, we would negotiate ciphers
only on fresh handshakes. On resumption, we would blindly use whatever
was in the session.
Instead, evaluate cipher suite preferences on every handshake.
Resumption requires that the saved cipher suite match the one that would
have been negotiated anyway. If client or server preferences changed
sufficiently, we decline the session.
This is much easier to reason about (we always pick the best cipher
suite), simpler, and avoids getting stuck under old preferences if
tickets are continuously renewed. Notably, although TLS 1.2 ticket
renewal does not work in practice, TLS 1.3 will renew tickets like
there's no tomorrow.
It also means we don't need dedicated code to avoid resuming a cipher
which has since been disabled. (That dedicated code was a little odd
anyway since the mask_k, etc., checks didn't occur. When cert_cb was
skipped on resumption, one could resume without ever configuring a
certificate! So we couldn't know whether to mask off RSA or ECDSA cipher
suites.)
Add tests which assert on this new arrangement.
BUG=116
Change-Id: Id40d851ccd87e06c46c6ec272527fd8ece8abfc6
Reviewed-on: https://boringssl-review.googlesource.com/11847
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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This is already manually released at the end of the handshake. With this
change, it can happen implicitly, and SSL3_STATE shrinks further by
another pointer.
Change-Id: I94b9f2e4df55e8f2aa0b3a8799baa3b9a34d7ac1
Reviewed-on: https://boringssl-review.googlesource.com/12121
Reviewed-by: Adam Langley <agl@google.com>
TLS 1.3 ciphers are now always enabled and come with a hard-coded
preference order.
BUG=110
Change-Id: Idd9cb0d75fb6bf2676ecdee27d88893ff974c4a3
Reviewed-on: https://boringssl-review.googlesource.com/12025
Reviewed-by: Adam Langley <agl@google.com>
Get some of the duplicate logic out of the way.
Change-Id: Iee7c64577e14d1ddfead7e1e32c42c5c9f2a310d
Reviewed-on: https://boringssl-review.googlesource.com/11981
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
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BUG=chromium:659593
Change-Id: I73a4751609b85df7cd40f0f60dc3f3046a490940
Reviewed-on: https://boringssl-review.googlesource.com/11861
Reviewed-by: David Benjamin <davidben@google.com>
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SSL_HANDSHAKE is dropped after the handshake, so I've removed the logic
around smaller sizes. It's much simpler when we can use CBS_stow and
CBB_finish without extra bounds-checking.
Change-Id: Idafaa5d69e171aed9a8759f3d44e52cb01c40f39
Reviewed-on: https://boringssl-review.googlesource.com/11567
Reviewed-by: Adam Langley <agl@google.com>
Now not only the pointers but also the list itself is released after the
handshake completes.
Change-Id: I8b568147d2d4949b3b0efe58a93905f77a5a4481
Reviewed-on: https://boringssl-review.googlesource.com/11528
Reviewed-by: Adam Langley <agl@google.com>
This releases memory associated with them after the handshake. Note this
changes the behavior of |SSL_get0_certificate_types| and
|SSL_get_client_CA_list| slightly. Both functions now return NULL
outside of the handshake. But they were already documented to return
something undefined when not called at the CertificateRequest.
A survey of callers finds none that would care. (Note
SSL_get_client_CA_list is used both as a getter for the corresponding
server config setter and to report client handshake properties. Only the
latter is affected.) It's also pretty difficult to imagine why a caller
would wish to query this stuff at any other time, and there are clear
benefits to dropping the CA list after the handshake (some servers send
ABSURDLY large lists).
Change-Id: I3ac3b601ff0cfa601881ce77ae33d99bb5327004
Reviewed-on: https://boringssl-review.googlesource.com/11521
Reviewed-by: Adam Langley <agl@google.com>
One less field to reset on renego and save a pointer of post-handshake
memory.
Change-Id: Ifc0c3c73072af244ee3848d9a798988d2c8a7c38
Reviewed-on: https://boringssl-review.googlesource.com/11086
Reviewed-by: Adam Langley <agl@google.com>
This was done just by grepping for 'size_t i;' and 'size_t j;'. I left
everything in crypto/x509 and friends alone.
There's some instances in gcm.c that are non-trivial and pulled into a
separate CL for ease of review.
Change-Id: I6515804e3097f7e90855f1e7610868ee87117223
Reviewed-on: https://boringssl-review.googlesource.com/10801
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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Now that ssl_bytes_to_cipher_list is uninteresting, it can be an
implementation detail of ssl3_choose_cipher. This removes a tiny amount
of duplicated TLS 1.2 / TLS 1.3 code.
Change-Id: I116a6bb08bbc43da573d4b7b5626c556e1a7452d
Reviewed-on: https://boringssl-review.googlesource.com/10221
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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To prevent configuration/established session confusion, the handshake
session state is separated into the configured session (ssl->session)
and the newly created session (ssl->s3->new_session). Upon conclusion of
the handshake, the finalized session is stored
in (ssl->s3->established_session). During the handshake, any requests
for the session (SSL_get_session) return a non-resumable session, to
prevent resumption of a partially filled session. Sessions should only
be cached upon the completion of the full handshake, using the resulting
established_session. The semantics of accessors on the session are
maintained mid-renego.
Change-Id: I4358aecb71fce4fe14a6746c5af1416a69935078
Reviewed-on: https://boringssl-review.googlesource.com/8612
Reviewed-by: David Benjamin <davidben@google.com>
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This adds the machinery for doing TLS 1.3 1RTT.
Change-Id: I736921ffe9dc6f6e64a08a836df6bb166d20f504
Reviewed-on: https://boringssl-review.googlesource.com/8720
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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This allows us to use CBB for all handshake messages. Now, SSL_PROTOCOL_METHOD
is responsible for implementing a trio of CBB-related hooks to assemble
handshake messages.
Change-Id: I144d3cac4f05b6637bf45d3f838673fc5c854405
Reviewed-on: https://boringssl-review.googlesource.com/8440
Reviewed-by: Adam Langley <agl@google.com>
It is an explicit copy of something, but it's a lot easier to reason about than
the init_buf/init_num gynmastics we were previously doing. This is along the
way to getting init_buf out of here.
Change-Id: Ia1819ba9db60ef6db09dd60d208dbc95fcfb4bd2
Reviewed-on: https://boringssl-review.googlesource.com/8432
Reviewed-by: Adam Langley <agl@google.com>
This implements the cipher suite constraints in "fake TLS 1.3". It also makes
bssl_shim and runner enable it by default so we can start adding MaxVersion:
VersionTLS12 markers to tests as 1.2 vs. 1.3 differences begin to take effect.
Change-Id: If1caf6e43938c8d15b0a0f39f40963b8199dcef5
Reviewed-on: https://boringssl-review.googlesource.com/8340
Reviewed-by: David Benjamin <davidben@google.com>
The separation is purely historical (what happened to use an SSL_ctrl hook), so
put them all in one place. Make a vague attempt to match the order of the
header file, though we're still very far from matching.
Change-Id: Iba003ff4a06684a6be342e438d34bc92cab1cd14
Reviewed-on: https://boringssl-review.googlesource.com/8189
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
It's unreachable and wouldn't work anyway. We'd never bubble up to the caller
to retry. As a consequence, the TLS side doesn't actually need to pay attention
to init_off.
(For now anyway. We'll probably need state of this sort once the write half is
all reworked. All the craziness with wpend_buf ought to be limited to the
SSL_write bits.)
Change-Id: I951534f6bbeb547ce0492d5647aaf76be42108a3
Reviewed-on: https://boringssl-review.googlesource.com/8179
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
The 'elliptic_curves' extension is being renamed to 'supported_groups'
in the TLS 1.3 draft, and most of the curve-specific methods are
generalized to groups/group IDs.
Change-Id: Icd1a1cf7365c8a4a64ae601993dc4273802610fb
Reviewed-on: https://boringssl-review.googlesource.com/7955
Reviewed-by: David Benjamin <davidben@google.com>
A lot of consumers of obj.h only want the NID values. Others didn't need
it at all. This also removes some OBJ_nid2sn and OBJ_nid2ln calls in EVP
error paths which isn't worth pulling a large table in for.
BUG=chromium:499653
Change-Id: Id6dff578f993012e35b740a13b8e4f9c2edc0744
Reviewed-on: https://boringssl-review.googlesource.com/7563
Reviewed-by: David Benjamin <davidben@google.com>
Most code already dereferences it directly.
Change-Id: I227fa91ecbf25a19077f7cfba21b0abd2bc2bd1d
Reviewed-on: https://boringssl-review.googlesource.com/7422
Reviewed-by: David Benjamin <davidben@google.com>
Partially fixes build with -Wmissing-prototypes.
Change-Id: I828bcfb49b23c5a9ea403038bc3fb76750556ef8
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
Reviewed-on: https://boringssl-review.googlesource.com/7514
Reviewed-by: David Benjamin <davidben@google.com>
Change-Id: I6267c9bfb66940d0b6fe5368514210a058ebd3cc
Reviewed-on: https://boringssl-review.googlesource.com/7494
Reviewed-by: Emily Stark (Dunn) <estark@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
David Benjamin
Steven Valdez
Matthew Braithwaite
Nick Harper
Piotr Sikora
Steven Valdez
