It does not appear removing support for these is feasible right now. :-(
Change-Id: I99521ba6c141855b5140d98bce445d7e62415661
Reviewed-on: https://boringssl-review.googlesource.com/17251
Reviewed-by: David Benjamin <davidben@google.com>
BUG=76
Change-Id: If58a73da38e46549fd55f84a9104e2dfebfda43f
Reviewed-on: https://boringssl-review.googlesource.com/14164
Reviewed-by: Steven Valdez <svaldez@google.com>
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Instead, extract it from the certificate, which is what everyone was
doing anyway. A follow-up change will take advantage of this cleanup to
deduplicate code between signing and verifying for which keys are good
for which signature algorithms.
BUG=188
Change-Id: Ic3f83a6477e8fa53e5e7233f4545f4d2c4b58d01
Reviewed-on: https://boringssl-review.googlesource.com/14565
Reviewed-by: Adam Langley <agl@google.com>
This is an unhelpfully generic name. Rename it to match SSL_ECDH_CTX.
Unqualified "public key" is typically assumed to be the certificate.
Change-Id: I8ba8c3f2bb1343d1c006845a1110e833451c5a56
Reviewed-on: https://boringssl-review.googlesource.com/14564
Reviewed-by: Adam Langley <agl@google.com>
This adds support on the server and client to accept data-less early
data. The server will still fail to parse early data with any
contents, so this should remain disabled.
BUG=76
Change-Id: Id85d192d8e0360b8de4b6971511b5e8a0e8012f7
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It's only called from within that file.
Change-Id: I281c9eb1ea25d9cfbec492ba8a4d007f45ae2635
Reviewed-on: https://boringssl-review.googlesource.com/14027
Reviewed-by: Adam Langley <agl@google.com>
This change converts the CA names that are parsed from a server's
CertificateRequest, as well as the CA names that are configured for
sending to clients in the same, to use |CRYPTO_BUFFER|.
The |X509_NAME|-based interfaces are turned into compatibility wrappers.
Change-Id: I95304ecc988ee39320499739a0866c7f8ff5ed98
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This lets us trim another two pointers of per-connection state.
Change-Id: I2145d529bc25b7e24a921d01e82ee99f2c98867c
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This makes sense to do if we are a client and initiate a renegotiation
at the same time as the server requesting one. Since we will never
initiate a renegotiation, this should not be necessary.
Change-Id: I5835944291fdb8dfcc4fed2ebf1064e91ccdbe6a
Reviewed-on: https://boringssl-review.googlesource.com/13825
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We sized the post-handshake message limit for the older zero-length
KeyUpdate and forgot to update it when it got larger.
Thanks to Matt Caswell for catching this.
Change-Id: I7d2189479e9516fbfb6c195dfa367794d383582c
Reviewed-on: https://boringssl-review.googlesource.com/13805
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Change-Id: I98903df561bbf8c5739f892d2ad5e89ac0eb8e6f
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Move to explicit hashing everywhere, matching TLS 1.2 with TLS 1.3. The
ssl_get_message calls between all the handshake states are now all
uniform so, when we're ready, we can rewire the TLS 1.2 state machine to
look like the TLS 1.3 one. (ssl_get_message calls become an
ssl_hs_read_message transition, reuse_message becomes an ssl_hs_ok
transition.)
This avoids some nuisance in processing the ServerHello at the 1.2 / 1.3
transition.
The downside of explicit hashing is we may forget to hash something, but
this will fail to interop with our tests and anyone else, so we should
be able to catch it.
BUG=128
Change-Id: I01393943b14dfaa98eec2a78f62c3a41c29b3a0e
Reviewed-on: https://boringssl-review.googlesource.com/13266
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This is kind of annoying (even new state is needed to keep the layering
right). As part of aligning the read paths of the TLS 1.2 and TLS 1.3
state machine, we'll want to move to states calling
ssl_hash_current_message when the process the message, rather than when
the message is read. Right now the TLS 1.2 optional message story
(reuse_message) depends on all messages preceded by an optional message
using ssl_hash_message. For instance, if TLS 1.2 decided to place
CertificateStatus before ServerKeyExchange, we would not be able to
handle it.
However, V2ClientHello, by being handled in the message layer, relies on
ssl_get_message-driven hashing to replace the usual ClientHello hash
with a hash of something custom. This switches things so rather than
ClientHellos being always pre-hashed by the message layer, simulated
ClientHellos no-op ssl_hash_current_message.
This just replaces one hack with another (V2ClientHello is inherently
nasty), but this hack should be more compatible with future plans.
BUG=128
Change-Id: If807ea749d91e306a37bb2362ecc69b84bf224c9
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This aligns the TLS 1.2 state machine closer with the TLS 1.3 state
machine. This is more work for the handshake, but ultimately the
plan is to take the ssl_get_message call out of the handshake (so it is
just the state machine rather than calling into BIO), so the parameters
need to be folded out as in TLS 1.3.
The WrongMessageType-* family of tests should make sure we don't miss
one of these.
BUG=128
Change-Id: I17a1e6177c52a7540b2bc6b0b3f926ab386c4950
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This was originally changed so that flush_flight could forward BIO_write
errors as-is, but we can and probably should still map BIO_flush errors.
This is unlikely to matter (every relevant BIO likely just has a no-op
flush which returns one), but, e.g., our file BIO returns 0, not -1, on
error.
We possibly should also be mapping BIO_write errors, but I'll leave that
alone for now. It's primarily BIO_read where the BIO return value must
be preserved due to error vs. EOF.
(We probably can just remove the BIO_flush calls altogether, but since
the buffer BIO forwarded the flush signal it would be a user-visible
behavior change to confirm.)
Change-Id: Ib495cc5d043867cf964f99b7ee4535114f7b2230
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Change-Id: I324743e7d1864fbbb9653209ff93e4da872c8d31
Reviewed-on: https://boringssl-review.googlesource.com/13340
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The TLS 1.2 state machine now looks actually much closer to the TLS 1.3
one on the write side. Although the write states still have a BIO-style
return, they don't actually send anything anymore. Only the BIO flush
state does. Reads are still integrated into the states themselves
though, so I haven't made it match TLS 1.3 yet.
BUG=72
Change-Id: I7708162efca13cd335723efa5080718a5f2808ab
Reviewed-on: https://boringssl-review.googlesource.com/13228
Reviewed-by: Adam Langley <agl@google.com>
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>
This adds support for setting 0-RTT mode on tickets minted by
BoringSSL, allowing for testing of the initial handshake knowledge.
BUG=76
Change-Id: Ic199842c03b5401ef122a537fdb7ed9e9a5c635a
Reviewed-on: https://boringssl-review.googlesource.com/12740
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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
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This is in preparation for implementing 0-RTT where, like
with client_traffic_secret_0, client_handshake_secret must
be derived slightly earlier than it is used. (The secret is
derived at ServerHello, but used at server Finished.)
Change-Id: I6a186b84829800704a62fda412992ac730422110
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This change removes the use of |X509_get_pubkey| from the TLS <= 1.2
code. That function is replaced with a shallow parse of the certificate
to extract the public key instead.
Change-Id: I8938c6c5a01b32038c6b6fa58eb065e5b44ca6d2
Reviewed-on: https://boringssl-review.googlesource.com/12707
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state is now initialized to SSL_ST_INIT in SSL_HANDSHAKE. If there is no
handshake present, we report SSL_ST_OK. This saves 8 bytes of
per-connection post-handshake memory.
Change-Id: Idb3f7031045caed005bd7712bc8c4b42c81a1d04
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This cuts down on a lot of unchecked ssl->s3->hs accesses. Next is
probably the mass of extensions callbacks, and then we can play
whack-a-mole with git grep.
Change-Id: I81c506ea25c2569a51ceda903853465b8b567b0f
Reviewed-on: https://boringssl-review.googlesource.com/12237
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We currently look up SSL_HANDSHAKE off of ssl->s3->hs everywhere, but
this is a little dangerous. Unlike ssl->s3->tmp, ssl->s3->hs may not be
present. Right now we just know not to call some functions outside the
handshake.
Instead, code which expects to only be called during a handshake should
take an explicit SSL_HANDSHAKE * parameter and can assume it non-NULL.
This replaces the SSL * parameter. Instead, that is looked up from
hs->ssl.
Code which is called in both cases, reads from ssl->s3->hs. Ultimately,
we should get to the point that all direct access of ssl->s3->hs needs
to be NULL-checked.
As a start, manage the lifetime of the ssl->s3->hs in SSL_do_handshake.
This allows the top-level handshake_func hooks to be passed in the
SSL_HANDSHAKE *. Later work will route it through the stack. False Start
is a little wonky, but I think this is cleaner overall.
Change-Id: I26dfeb95f1bc5a0a630b5c442c90c26a6b9e2efe
Reviewed-on: https://boringssl-review.googlesource.com/12236
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This simplifies a little code around EMS and PSK KE modes, but requires
tweaking the SNI code.
The extensions that are more tightly integrated with the handshake are
still processed inline for now. It does, however, require an extra state
in 1.2 so the asynchronous session callback does not cause extensions to
be processed twice. Tweak a test enforce this.
This and a follow-up to move cert_cb before resumption are done in
preparation for resolving the cipher suite before resumption and only
resuming on match.
Note this has caller-visible effects:
- The legacy SNI callback happens before resumption.
- The ALPN callback happens before resumption.
- Custom extension ClientHello parsing callbacks also cannot depend on
resumption state.
- The DoS protection callback now runs after all the extension callbacks
as it is documented to be called after the resumption decision.
BUG=116
Change-Id: I1281a3b61789b95c370314aaed4f04c1babbc65f
Reviewed-on: https://boringssl-review.googlesource.com/11845
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TLS 1.3 adds a number of places with extensions blocks that don't easily
fit into our ClientHello/EncryptedExtensions callbacks. Between
HelloRetryRequest, ServerHello, draft 18 going nuts with Certificate,
and NewSessionTicket when we do 0-RTT, this passes the "abstract things
that are repeated three times" sniff test.
For now, it rejects unknown extensions, but it will probably grow an
allow_unknown parameter for NewSessionTicket.
This involves disabling some MSVC warnings, but they're invalid as of
C99 which we otherwise require. See
https://connect.microsoft.com/VisualStudio/feedback/details/1230248/remove-c99-related-warnings-or-make-them-off-by-default
Change-Id: Iea8bf8ab216270c081dd63e79aaad9ec73b3b550
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For TLS 1.3 draft 18, it will be useful to get at the full current
message and not just the body. Add a hook to expose it and replace
hash_current_message with a wrapper over it.
BUG=112
Change-Id: Ib9e00dd1b78e8b72e12409d85c80e96c5b411a8b
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dtls1_finish_message should NULL *out_msg before calling OPENSSL_free,
rather than asking ssl3_complete_message to do it. ssl3_finish_message
has no need to call it at all.
Change-Id: I22054217073690ab391cd19bf9993b1ceada41fd
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This is to allow for PSK binders to be munged into the ClientHello as part of
draft 18.
BUG=112
Change-Id: Ic4fd3b70fa45669389b6aaf55e61d5839f296748
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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>
We'll never send cookies, but we'll echo them on request. Implement it
in runner as well and test.
BUG=98
Change-Id: Idd3799f1eaccd52ac42f5e2e5ae07c209318c270
Reviewed-on: https://boringssl-review.googlesource.com/11565
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This doesn't currently honor the required KeyUpdate response. That will
be done in a follow-up.
BUG=74
Change-Id: I750fc41278736cb24230303815e839c6f6967b6a
Reviewed-on: https://boringssl-review.googlesource.com/11412
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We only save them at TLS 1.0 through 1.2. This saves 104 bytes of
per-connection memory.
Change-Id: If397bdc10e40f0194cba01024e0e9857d6b812f0
Reviewed-on: https://boringssl-review.googlesource.com/11571
Reviewed-by: Adam Langley <agl@google.com>
We only need one copy, not two. This trims 130 bytes of per-connection
memory.
Change-Id: I334aa7b1f8608e72426986bfa68534d416f3bda9
Reviewed-on: https://boringssl-review.googlesource.com/11569
Reviewed-by: Adam Langley <agl@google.com>
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
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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>
We'd previously been assuming we'd want to predict P-256 and X25519 but,
on reflection, that's nonsense. Although, today, P-256 is widespread and
X25519 is less so, that's not the right question to ask. Those servers
are all 1.2.
The right question is whether we believe enough servers will get to TLS
1.3 before X25519 to justify wasting 64 bytes on all other connections.
Given that OpenSSL has already shipped X25519 and Microsoft was doing
interop testing on X25519 around when we were shipping it, I think the
answer is no.
Moreover, if we are wrong, it will be easier to go from predicting one
group to two rather than the inverse (provided we send a fake one with
GREASE). I anticipate prediction-miss HelloRetryRequest logic across the
TLS/TCP ecosystem will be largely untested (no one wants to pay an RTT),
so taking a group out of the predicted set will likely be a risky
operation.
Only predicting one group also makes things a bit simpler. I haven't
done this here, but we'll be able to fold the 1.2 and 1.3 ecdh_ctx's
together, even.
Change-Id: Ie7e42d3105aca48eb9d97e2e05a16c5379aa66a3
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This will make it a little easier to store the normalized version rather
than the wire version. Also document the V2ClientHello behavior.
Change-Id: I5ce9ccce44ca48be2e60ddf293c0fab6bba1356e
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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>
It's easy to forget to check those. Unfortunately, it's also easy to
forget to check inner structures, which is going to be harder to stress,
but do these to start with. In doing, so fix up and unify some
error-handling, and add a missing check when parsing TLS 1.2
CertificateRequest.
This was also inspired by the recent IETF posting.
Change-Id: I27fe3cd3506258389a75d486036388400f0a33ba
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peer_sigalgs should live on SSL_HANDSHAKE. This both releases a little
bit of memory after the handshake is over and also avoids the bug where
the sigalgs get dropped if SSL_set_SSL_CTX is called at a bad time. See
also upstream's 14e14bf6964965d02ce89805d9de867f000095aa.
This only affects consumers using the old SNI callback and not
select_certificate_cb.
Add a test that the SNI callback works as expected. In doing so, add an
SSL_CTX version of the signing preferences API. This is a property of
the cert/key pair (really just the key) and should be tied to that. This
makes it a bit easier to have the regression test work with TLS 1.2 too.
I thought we'd fixed this already, but apparently not... :-/
BUG=95
Change-Id: I75b02fad4059e6aa46c3b05183a07d72880711b3
Reviewed-on: https://boringssl-review.googlesource.com/10445
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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s3_both.c does a few too many things right now, but SSL_HANDSHAKE is not
only for TLS 1.3.
Change-Id: Ieac17c592a1271d4d5c9cee005eaf5642772b8f5
Reviewed-on: https://boringssl-review.googlesource.com/10443
Reviewed-by: David Benjamin <davidben@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>
Commit-Queue: David Benjamin <davidben@google.com>
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This finishes getting rid of ssl_read_bytes! Now we have separate
entry-points for the various cases. For now, I've kept TLS handshake
consuming records partially. When we do the BIO-less API, I expect that
will need to change, since we won't have the record buffer available.
(Instead, the ssl3_read_handshake_bytes and extend_handshake_buffer pair
will look more like the DTLS side or Go and pull the entire record into
init_buf.)
This change opts to make read_app_data drive the message to completion
in anticipation of DTLS 1.3. That hasn't been specified, but
NewSessionTicket certainly will exist. Knowing that DTLS necessarily has
interleave seems something better suited for the SSL_PROTOCOL_METHOD
internals to drive.
It needs refining, but SSL_PROTOCOL_METHOD is now actually a half-decent
abstraction boundary between the higher-level protocol logic and
DTLS/TLS-specific record-layer and message dispatchy bits.
BUG=83
Change-Id: I9b4626bb8a29d9cb30174d9e6912bb420ed45aff
Reviewed-on: https://boringssl-review.googlesource.com/9001
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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With the previous DTLS change, the dispatch layer only cares about the
end of the handshake to know when to drop the current message. TLS 1.3
post-handshake messages will need a similar hook, so convert it to this
lower-level one.
BUG=83
Change-Id: I4c8c3ba55ba793afa065bf261a7bccac8816c348
Reviewed-on: https://boringssl-review.googlesource.com/8989
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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This was only used so we knew when we had a current message to discard
and when we didn't. With init_msg being tracked better, we can use that
instead.
As part of this, switch the V2ClientHello hack to not using
reuse_message. Otherwise we have to fill in init_msg and friends in two
places.
The next change will require that we have a better handle on the "is
there a current message" boolean.
BUG=83
Change-Id: I917efacbad10806d492bbe51eda74c0779084d60
Reviewed-on: https://boringssl-review.googlesource.com/8987
Reviewed-by: Adam Langley <agl@google.com>
Somewhat clearer what it's for than just 4.
Change-Id: Ie7bb89ccdce188d61741da203acd624b49b69058
Reviewed-on: https://boringssl-review.googlesource.com/8986
Reviewed-by: Adam Langley <agl@google.com>
For TLS 1.3, we will need to process more complex post-handshake
messages. It is simplest if we use the same mechanism. In preparation,
allow ssl3_get_message to be called at any point.
Note that this stops reserving SSL3_RT_MAX_PLAIN_LENGTH in init_buf
right off the bat. Instead it will grow as-needed to accomodate the
handshake. SSL3_RT_MAX_PLAIN_LENGTH is rather larger than we probably
need to receive, particularly as a server, so this seems a good plan.
BUG=83
Change-Id: Id7f4024afc4c8a713b46b0d1625432315594350e
Reviewed-on: https://boringssl-review.googlesource.com/8985
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
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