This CL removes the last of the EVP_CIPHER codepath in ssl/. The dead code is
intentionally not pruned for ease of review, except in DTLS-only code where
adding new logic to support both, only to remove half, would be cumbersome.
Fixes made:
- dtls1_retransmit_state is taught to retain aead_write_ctx rather than
enc_write_ctx.
- d1_pkt.c reserves space for the variable-length nonce when echoed into the
packet.
- dtls1_do_write sizes the MTU based on EVP_AEAD max overhead.
- tls1_change_cipher_state_cipher should not free AEAD write contexts in DTLS.
This matches the (rather confused) ownership for the EVP_CIPHER contexts.
I've added a TODO to resolve this craziness.
A follow-up CL will remove all the resultant dead code.
Change-Id: I644557f4db53bbfb182950823ab96d5e4c908866
Reviewed-on: https://boringssl-review.googlesource.com/2699
Reviewed-by: Adam Langley <agl@google.com>
This introduces another knob into SSL_AEAD_CTX to omit the version from the ad
parameter. It also allows us to fold a few more SSL3_ENC_METHOD hooks together.
Change-Id: I6540d410d4722f734093554fb434dab6e5217d4f
Reviewed-on: https://boringssl-review.googlesource.com/2698
Reviewed-by: Adam Langley <agl@google.com>
This lets us fold away the SSLv3-specific generate_master_secret. Once SSLv3
uses AEADs, others will fold away as well.
Change-Id: I27c1b75741823bc6db920d35f5dd5ce71b6fdbb3
Reviewed-on: https://boringssl-review.googlesource.com/2697
Reviewed-by: Adam Langley <agl@google.com>
Fix up the generate_master_secret parameter while we're here.
Change-Id: I1c80796d1f481be0c3eefcf3222f2d9fc1de4a51
Reviewed-on: https://boringssl-review.googlesource.com/2696
Reviewed-by: Adam Langley <agl@google.com>
size_t all the parameters. Also explicitly label label as label. This is in
preparation for pulling the PRF out into SSL3_ENC_METHOD so more of the
SSL3_ENC_METHOD hooks may be shared between SSLv3 and TLS once SSLv3 uses
stateful AEADs.
Also port away from EVP_PKEY_HMAC and use HMAC_CTX directly. The abstraction
doesn't buy much and is different from all the other EVP_DigestSign* functions.
There are few enough users within BoringSSL and Google that we can probably
deprecate and eventually remove it altogether.
Change-Id: I5d4529438c8a2a992fc199388a0c9e73bd6d2e06
Reviewed-on: https://boringssl-review.googlesource.com/2695
Reviewed-by: Adam Langley <agl@google.com>
The EVP_CIPHER codepath should no longer be used with TLS. It still exists for
DTLS and SSLv3. The AEAD construction in TLS does not allow for
variable-overhead AEADs, so stateful AEADs do not include the length in the ad
parameter. Rather the AEADs internally append the unpadded length once it is
known. EVP_aead_rc4_md5_tls is modified to account for this.
Tests are added (and RC4-MD5's regenerated) for each of the new AEADs. The
cipher tests are all moved into crypto/cipher/test because there's now a lot of
them and they clutter the directory listing.
In ssl/, the stateful AEAD logic is also modified to account for stateful AEADs
with a fixed IV component, and for AEADs which use a random nonce (for the
explicit-IV CBC mode ciphers).
The new implementation fixes a bug/quirk in stateless CBC mode ciphers where
the fixed IV portion of the keyblock was generated regardless. This is at the
end, so it's only relevant for EAP-TLS which generates a MSK from the end of
the key block.
Change-Id: I2d8b8aa11deb43bde2fd733f4f90b5d5b8cb1334
Reviewed-on: https://boringssl-review.googlesource.com/2692
Reviewed-by: Adam Langley <agl@google.com>
It's not worth saving the extra mallocs. This is preparation for moving SSLv3
to stateful AEADs; it'll share code TLS's SSL3_ENC_METHOD, but
tls1_generate_key_block is different, so that'll be pulled out into its own
hook.
Change-Id: I3f2136600758465c66ce23736041bb47f74efa6d
Reviewed-on: https://boringssl-review.googlesource.com/2690
Reviewed-by: Adam Langley <agl@google.com>
More modern versions of GCC (at least with aarch64) are warning about an
unused value in these locations. It's incorrect, but I guess that the
macro is confusing it.
Using a (void) tag is a little ugly but solves the problem.
Change-Id: If6ba5083ab6e501c81e7743ae1ed99a89565e57c
Reviewed-on: https://boringssl-review.googlesource.com/2810
Reviewed-by: Adam Langley <agl@google.com>
The minimum MTU (not consistently enforced) is just under 256, so it's
difficult to test everything, but this is a basic test. (E.g., without renego,
the only handshake message with encryption is Finished which fits in the MTU.)
It tests the server side because the Certificate message is large enough to
require fragmentation.
Change-Id: Ida11f1057cebae2b800ad13696f98bb3a7fbbc5e
Reviewed-on: https://boringssl-review.googlesource.com/2824
Reviewed-by: Adam Langley <agl@google.com>
This should have been removed with its dtls1_clear cousin in
8c88153465.
Change-Id: Ibf4ee67348f603285b26766568cbb92183b62cee
Reviewed-on: https://boringssl-review.googlesource.com/2823
Reviewed-by: Adam Langley <agl@google.com>
State on s3 gets freed in both ssl3_clear and ssl3_free. Considate to just
ssl3_free. This replaces the (SSL,ssl,ssl3)_clear calls in (SSL,ssl,ssl3)_new
with the state that was initialized. This results in a little code duplication
between SSL_new and SSL_clear because state is on the wrong object. I've just
left TODOs for now; some of it will need disentangling.
We're far from it, but going forward, separate state between s and s->s3 as:
- s contains configuration state, DTLS or TLS. It is initialized from SSL_CTX,
configurable directly afterwards, and preserved across SSL_clear calls.
(Including when it's implicitly set as part of a handshake callback.)
- Connection state hangs off s->s3 (TLS) and s->d1 (DTLS). It is reset across
SSL_clear. This should happen naturally out of a ssl_free/ssl_new pair.
The goal is to avoid needing separate initialize and reset code for anything;
the point any particular state is reset is the point its owning context is
destroyed and recreated.
Change-Id: I5d779010778109f8c339c07433a0777feaf94d1f
Reviewed-on: https://boringssl-review.googlesource.com/2822
Reviewed-by: Adam Langley <agl@google.com>
Configuration data inherited from the ctx happens in SSL_new. (This also gets
in the way of using ssl3_free/ssl3_new to implement SSL_clear.)
Change-Id: I2773af91abf4e1edc0c1a324bc1e94088d7c2274
Reviewed-on: https://boringssl-review.googlesource.com/2821
Reviewed-by: Adam Langley <agl@google.com>
A memory leak can occur in dtls1_buffer_record if either of the calls to
ssl3_setup_buffers or pqueue_insert fail. The former will fail if there
is a malloc failure, whilst the latter will fail if attempting to add a
duplicate record to the queue. This should never happen because
duplicate records should be detected and dropped before any attempt to
add them to the queue. Unfortunately records that arrive that are for
the next epoch are not being recorded correctly, and therefore replays
are not being detected. Additionally, these "should not happen" failures
that can occur in dtls1_buffer_record are not being treated as fatal and
therefore an attacker could exploit this by sending repeated replay
records for the next epoch, eventually causing a DoS through memory
exhaustion.
Thanks to Chris Mueller for reporting this issue and providing initial
analysis and a patch. Further analysis and the final patch was performed
by Matt Caswell from the OpenSSL development team.
CVE-2015-0206
(Imported from upstream's 7c6a3cf2375f5881ef3f3a58ac0fbd0b4663abd1).
Change-Id: I765fe61c75bc295bcc4ab356b8a5ce88c8964764
Reviewed-on: https://boringssl-review.googlesource.com/2782
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Add a dedicated error code to the queue for a handshake_failure alert in
response to ClientHello. This matches NSS's client behavior and gives a better
error on a (probable) failure to negotiate initial parameters.
BUG=https://crbug.com/446505
Change-Id: I34368712085a6cbf0031902daf2c00393783d96d
Reviewed-on: https://boringssl-review.googlesource.com/2751
Reviewed-by: Adam Langley <agl@google.com>
The |skip_message| variable was overly complex and, since we have at
least 32-bit ints, we know that a 24-bit value doesn't overflow an int.
Change-Id: I5c16fa979e1716f39cc47882c033bcf5bce3284c
Reviewed-on: https://boringssl-review.googlesource.com/2610
Reviewed-by: Adam Langley <agl@google.com>
RAND_pseudo_bytes just calls RAND_bytes now and only returns 0 or 1. Switch all
callers within the library call the new one and use the simpler failure check.
This fixes a few error checks that no longer work (< 0) and some missing ones.
Change-Id: Id51c79deec80075949f73fa1fbd7b76aac5570c6
Reviewed-on: https://boringssl-review.googlesource.com/2621
Reviewed-by: Adam Langley <agl@google.com>
No current use of ssl_cert_type passes a NULL EVP_PKEY, so it can be simplified
a little.
Change-Id: I2052cc3b6069cd30e4685ba8a6d0014016a4d712
Reviewed-on: https://boringssl-review.googlesource.com/2620
Reviewed-by: Adam Langley <agl@google.com>
Currently we don't express an opinion. Most sites aren't likely to have a
choice since it depends on what certificates they have available. But we may as
well order them.
Change-Id: I4fffa5e392f42e19823cb8faa2e9e15a6bb91086
Reviewed-on: https://boringssl-review.googlesource.com/2607
Reviewed-by: Adam Langley <agl@google.com>
Turns out the EVP_CIPH_FLAG_CUSTOM_CIPHER ciphers (i.e. legacy EVP_CIPHER
AES-GCM) have a completely different return value setup than the normal ones
which are the standard one/zero. (Except that they never return zero; see
TODO.)
Fix checks in ssl/ and remove remnants of EVP_CIPH_FLAG_CUSTOM_CIPHER in ssl/
as we're using EVP_AEAD now.
See CHANGES entry added in upstream's 3da0ca796cae6625bd26418afe0a1dc47bf5a77f.
Change-Id: Ia4d0ff59b03c35fab3a08141c60b9534cb7172e2
Reviewed-on: https://boringssl-review.googlesource.com/2606
Reviewed-by: Adam Langley <agl@google.com>
Those version checks are if renego tried to change the version, but at that
point we're out of the initial null cipher and should leave the version fixed.
(On the server end, the code in question was dead after the version negotiation
rewrite anyway.)
Change-Id: I3242ba11bc9981ccf7fdb867176d59846cc49dd9
Reviewed-on: https://boringssl-review.googlesource.com/2605
Reviewed-by: Adam Langley <agl@google.com>
This avoids needing a should_add_to_finished_hash boolean on do_write. The
logic in do_write was a little awkward because do_write would be called
multiple times if the write took several iterations. This also gets complex if
DTLS retransmits are involved. (At a glance, it's not obvious the
BIO_CTRL_DGRAM_MTU_EXCEEDED case actually works.)
Doing it as the handshake message is being prepared avoids this concern. It
also gives a natural point for the extended master secret logic which needs to
do work after the finished hash has been sampled.
As a bonus, we can remove s->d1->retransmitting which was only used to deal
with this issue.
Change-Id: Ifedf23ee4a6c5e08f960d296a6eb1f337a16dc7a
Reviewed-on: https://boringssl-review.googlesource.com/2604
Reviewed-by: Adam Langley <agl@google.com>
That comment is wrong as of TLS 1.2.
Change-Id: I900d5efc09d7468f2601d85f867833e43d046f6a
Reviewed-on: https://boringssl-review.googlesource.com/2603
Reviewed-by: Adam Langley <agl@google.com>
(Or should we just drop this? It only matters for servers trying to use client
auth.)
Change-Id: I50b6999375dc8f9246bf617f17929ae304503c57
Reviewed-on: https://boringssl-review.googlesource.com/2602
Reviewed-by: Adam Langley <agl@google.com>
Some of the messages did the computation manually which would bite us if we
tried to transplant them between DTLS and TLS. More importantly, it precludes
moving the handshake hash computation from ssl_do_write to
ssl_set_handshake_header.
Change-Id: I9d400deb0720e62cb1ab905242eb0679ad650a46
Reviewed-on: https://boringssl-review.googlesource.com/2600
Reviewed-by: Adam Langley <agl@google.com>
The frag_off/frag_len parameters are always zero, and the return value is never
used.
Change-Id: If7487b23c55f2a996e411b25b76a8e1651f25d8b
Reviewed-on: https://boringssl-review.googlesource.com/2601
Reviewed-by: Adam Langley <agl@google.com>
This change has no semantic effect (I hope!). It's just a reformatting
of a few files in ssl/. This is just a start – the other files in ssl/
should follow in the coming days.
Change-Id: I5eb3f4b18d0d46349d0f94d3fe5ab2003db5364e
David is heading out so I didn't want to block the previous batch of
changes for weeks. Thus I landed them as-is and this change tweaks a
couple of things that would normally have been addressed in code-review.
Change-Id: I2579dbc43d93fea34a52b4041f5511d70217aaf7
Ensure that both the client and the server emit a protocol_version alert
(except in SSLv3 where it doesn't exist) with a record-layer version which the
peer will recognize.
Change-Id: I31650a64fe9b027ff3d51e303711910a00b43d6f
This makes SSLv23_method go through DTLS_ANY_VERSION's version negotiation
logic. This allows us to get rid of duplicate ClientHello logic. For
compatibility, SSL_METHOD is now split into SSL_PROTOCOL_METHOD and a version.
The legacy version-locked methods set min_version and max_version based this
version field to emulate the original semantics.
As a bonus, we can now handle fragmented ClientHello versions now.
Because SSLv23_method is a silly name, deprecate that too and introduce
TLS_method.
Change-Id: I8b3df2b427ae34c44ecf972f466ad64dc3dbb171
Tested manually by replacing SSLv23_method() with TLSv1_2_method() in
bssl_shim. This is a large chunk of code which is not run in SSLv23_method(),
but it will be run after unification. It's split out separately to ease review.
Change-Id: I6bd241daca17aa0f9b3e36e51864a29755a41097
Match the DTLS code. Rather than sniffing the handshake state, use the
have_version bit.
Change-Id: I40e92f187647417c34b4cfdc3ad258f5562e781b
Reviewed-on: https://boringssl-review.googlesource.com/2588
Reviewed-by: Adam Langley <agl@google.com>
These tests use both APIs. This also modifies the inline version negotiation's
error codes (currently only used for DTLS) to align with SSLv23's error codes.
Note: the peer should send a protocol_version alert which is currently untested
because it's broken.
Upstream would send such an alert if TLS 1.0 was supported but not otherwise,
which is somewhat bizarre. We've actually regressed and never send the alert in
SSLv23. When version negotiation is unified, we'll get the alerts back.
Change-Id: I4c77bcef3a3cd54a039a642f189785cd34387410
Reviewed-on: https://boringssl-review.googlesource.com/2584
Reviewed-by: Adam Langley <agl@google.com>
Amend the version negotiation tests to test this new spelling of max_version.
min_version will be tested in a follow-up.
Change-Id: Ic4bfcd43bc4e5f951140966f64bb5fd3e2472b01
Reviewed-on: https://boringssl-review.googlesource.com/2583
Reviewed-by: Adam Langley <agl@google.com>
DTLS_method() can now negotiate versions without switching methods.
Change-Id: I0655b3221b6e7e4b3ed4acc45f1f41c594447021
Reviewed-on: https://boringssl-review.googlesource.com/2582
Reviewed-by: Adam Langley <agl@google.com>
SSL3_ENC_METHOD will remain version-specific while SSL_METHOD will become
protocol-specific. This finally removes all the version-specific portions of
SSL_METHOD but the version tag itself.
(SSL3_ENC_METHOD's version-specific bits themselves can probably be handled by
tracking a canonicalized protocol version. It would simplify version
comparisons anyway. The one catch is SSLv3 has a very different table. But
that's a cleanup for future. Then again, perhaps a version-specific method
table swap somewhere will be useful later for TLS 1.3.)
Much of this commit was generated with sed invocation:
s/method->ssl3_enc/enc_method/g
Change-Id: I2b192507876aadd4f9310240687e562e56e6c0b1
Reviewed-on: https://boringssl-review.googlesource.com/2581
Reviewed-by: Adam Langley <agl@google.com>
Now SSLv23 and DTLS_ANY_VERSION share version-related helper functions.
ssl3_get_method is temporary until the method switch is no longer necessary.
Put them all together so there's one place to refactor them when we add a new
version or implement min_version/max_version controls.
Change-Id: Ic28a145cad22db08a87fdb854480b22886c451c6
Reviewed-on: https://boringssl-review.googlesource.com/2580
Reviewed-by: Adam Langley <agl@google.com>
Missed this one. It requires that we be able to change an SSL_METHOD after the
after, which complicates compiling the version locking into min_version /
max_version configurations.
Change-Id: I24ba54b7939360bbfafe3feb355a65840bda7611
Reviewed-on: https://boringssl-review.googlesource.com/2579
Reviewed-by: Adam Langley <agl@google.com>
SSL_ST_BEFORE isn't a possible state anymore. It seems this state meant the
side wasn't known, back in the early SSLeay days. Now upstream guesses
(sometimes incorrectly with generic methods), and we don't initialize until
later. SSL_shutdown also doesn't bother to call ssl3_shutdown at all if the
side isn't initialized and SSL_ST_BEFORE isn't the uninitialized state, which
seems a much more sensible arrangement.
Likewise, because bare SSL_ST_BEFOREs no longer exist, SSL_in_init implies
SSL_in_before and there is no need to check both.
Change-Id: Ie680838b2f860b895073dabb4d759996e21c2824
Reviewed-on: https://boringssl-review.googlesource.com/2564
Reviewed-by: Adam Langley <agl@google.com>
These may as well be replaced with assertions. Get them out of the way of the
initialization.
Change-Id: Ie4ab8bdc018e4a1def7d3f6b3b172a77896bfc0a
Reviewed-on: https://boringssl-review.googlesource.com/2563
Reviewed-by: Adam Langley <agl@google.com>
They're always known now. Also fix the SSLv23_{client,server}_method
definitions still had their own macro invocations.
Change-Id: Ia13f29a27f2331d25a4051e83f2d5abc62fab981
Reviewed-on: https://boringssl-review.googlesource.com/2562
Reviewed-by: Adam Langley <agl@google.com>
There's an undefined one not used anywhere. The others ought to be const. Also
move the forward declaration to ssl.h so we don't have to use the struct name.
Change-Id: I76684cf65255535c677ec19154cac74317c289ba
Reviewed-on: https://boringssl-review.googlesource.com/2561
Reviewed-by: Adam Langley <agl@google.com>
else block got lost in a rewrite of this code.
Change-Id: I51f1655474ec8bbd4eccb4297124e8584329444e
Reviewed-on: https://boringssl-review.googlesource.com/2560
Reviewed-by: Adam Langley <agl@google.com>
The client_version needs to be preserved, both for the RSA key exchange and
(when this codepath is used for TLS) for the SChannel renego workaround. Fix
the tests to enforce this so the cipher suite version tests catch this.
Change-Id: I0c42dc3ec4830f3724026b400e5066e7a7f1ee97
Reviewed-on: https://boringssl-review.googlesource.com/2551
Reviewed-by: Adam Langley <agl@google.com>
There's no need to make that conditional.
Change-Id: Idac1aba42b22e3fe8e7731ae4ecb5ebc4183336c
Reviewed-on: https://boringssl-review.googlesource.com/2550
Reviewed-by: Adam Langley <agl@google.com>
