dh.c had a 10k-bit limit but it wasn't quite correctly enforced. However,
that's still 1.12s of jank on the IO thread, which is too long. Since the SSL
code consumes DHE groups from the network, it should be responsible for
enforcing what sanity it needs on them.
Costs of various bit lengths on 2013 Macbook Air:
1024 - 1.4ms
2048 - 14ms
3072 - 24ms
4096 - 55ms
5000 - 160ms
10000 - 1.12s
UMA says that DHE groups are 0.2% 4096-bit and otherwise are 5.5% 2048-bit and
94% 1024-bit and some noise. Set the limit to 4096-bit to be conservative,
although that's already quite a lot of jank.
BUG=554295
Change-Id: I8e167748a67e4e1adfb62d73dfff094abfa7d215
Reviewed-on: https://boringssl-review.googlesource.com/6464
Reviewed-by: Adam Langley <agl@google.com>
The current check has two problems:
- It only runs on the server, where there isn't a curve list at all. This was a
mistake in https://boringssl-review.googlesource.com/1843 which flipped it
from client-only to server-only.
- It only runs in TLS 1.2, so one could bypass it by just negotiating TLS 1.1.
Upstream added it as part of their Suite B mode, which requires 1.2.
Move it elsewhere. Though we do not check the entire chain, leaving that to the
certificate verifier, signatures made by the leaf certificate are made by the
SSL/TLS stack, so it's reasonable to check the curve as part of checking
suitability of a leaf.
Change-Id: I7c12f2a32ba946a20e9ba6c70eff23bebcb60bb2
Reviewed-on: https://boringssl-review.googlesource.com/6414
Reviewed-by: Adam Langley <agl@google.com>
This exposes the ServerKeyExchange signature hash type used in the most recent
handshake, for histogramming on the client.
BUG=549662
Change-Id: I8a4e00ac735b1ecd2c2df824112c3a0bc62332a7
Reviewed-on: https://boringssl-review.googlesource.com/6413
Reviewed-by: Adam Langley <agl@google.com>
This fixes a number of bugs with the original logic:
- If handshake messages are fragmented and writes need to be retried, frag_off
gets completely confused.
- The BIO_flush call didn't set rwstate, so it wasn't resumable at that point.
- The msg_callback call gets garbage because the fragment header would get
scribbled over the handshake buffer.
The original logic was also extremely confusing with how it handles init_off.
(init_off gets rewound to make room for the fragment header. Depending on
where you pause, resuming may or may not have already been rewound.)
For simplicity, just allocate a new buffer to assemble the fragment in and
avoid clobbering the old one. I don't think it's worth the complexity to
optimize that. If we want to optimize this sort of thing, not clobbering seems
better anyway because the message may need to be retransmitted. We could avoid
doing a copy when buffering the outgoing message for retransmission later.
We do still need to track how far we are in sending the current message via
init_off, so I haven't opted to disconnect this function from
init_{buf,off,num} yet.
Test the fix to the retry + fragment case by having the splitHandshake option
to the state machine tests, in DTLS, also clamp the MTU to force handshake
fragmentation.
Change-Id: I66f634d6c752ea63649db8ed2f898f9cc2b13908
Reviewed-on: https://boringssl-review.googlesource.com/6421
Reviewed-by: Adam Langley <agl@google.com>
This option causes clients to ignore HelloRequest messages completely.
This can be suitable in cases where a server tries to perform concurrent
application data and handshake flow, e.g. because they are trying to
“renew” symmetric keys.
Change-Id: I2779f7eff30d82163f2c34a625ec91dc34fab548
Reviewed-on: https://boringssl-review.googlesource.com/6431
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Although the DTLS transport layer logic drops failed writes on the floor, it is
actually set up to work correctly. If an SSL_write fails at the transport,
dropping the buffer is fine. Arguably it works better than in TLS because we
don't have the weird "half-committed to data" behavior. Likewise, the handshake
keeps track of how far its gotten and resumes the message at the right point.
This broke when the buffering logic was rewritten because I didn't understand
what the DTLS code was doing. The one thing that doesn't work as one might
expect is non-fatal write errors during rexmit are not recoverable. The next
timeout must fire before we try again.
This code is quite badly sprinkled in here, so add tests to guard it against
future turbulence. Because of the rexmit issues, the tests need some hacks
around calls which may trigger them. It also changes the Go DTLS implementation
from being completely strict about sequence numbers to only requiring they be
monotonic.
The tests also revealed another bug. This one seems to be upstream's fault, not
mine. The logic to reset the handshake hash on the second ClientHello (in the
HelloVerifyRequest case) was a little overenthusiastic and breaks if the
ClientHello took multiple tries to send.
Change-Id: I9b38b93fff7ae62faf8e36c4beaf848850b3f4b9
Reviewed-on: https://boringssl-review.googlesource.com/6417
Reviewed-by: Adam Langley <agl@google.com>
It's somewhat annoying to have to parse out the packetAdaptor mini-language.
Actually seeing those is only useful when debugging the adaptor itself, rather
than DTLS. Switch the order of the two middleware bits and add an escape hatch
to log the funny opcodes.
Change-Id: I249c45928a76b747d69f3ab972ea4d31e0680a62
Reviewed-on: https://boringssl-review.googlesource.com/6416
Reviewed-by: Adam Langley <agl@google.com>
Right whether NPN is advertised can only be configured globally on the SSL_CTX.
Rather than adding two pointers to each SSL*, add an options bit to disable it
so we may plumb in a field trial to disable NPN.
Chromium wants to be able to route a bit in to disable NPN, but it uses SSL_CTX
incorrectly and has a global one, so it can't disconnect the callback. (That
really needs to get fixed. Although it's not clear this necessarily wants to be
lifted up to SSL_CTX as far as Chromium's SSLClientSocket is concerned since
NPN doesn't interact with the session cache.)
BUG=526713
Change-Id: I49c86828b963eb341c6ea6a442557b7dfa190ed3
Reviewed-on: https://boringssl-review.googlesource.com/6351
Reviewed-by: Adam Langley <alangley@gmail.com>
RFC 5077 explicitly allows the server to change its mind and send no
ticket by sending an empty NewSessionTicket. See also upstream's
21b538d616b388fa0ce64ef54da3504253895cf8.
CBS_stow handles this case somewhat, so we won't get confused about
malloc(0) as upstream did. But we'll still fill in a bogus SHA-256
session ID, cache the session, and send a ClientHello with bogus session
ID but empty ticket extension. (The session ID field changes meaning
significantly when the ticket is or isn't empty. Non-empty means "ignore
the session ID, but echo if it resuming" while empty means "I support
tickets, but am offering this session ID".
The other behavior change is that a server which changes its mind on a
resumption handshake will no longer override the client's session cache
with a ticket-less session.
(This is kind of silly. Given that we don't get completely confused due
to CBS_stow, it might not be worth bothering with the rest. Mostly it
bugged me that we send an indicator session ID with no ticket.)
Change-Id: Id6b5bde1fe51aa3e1f453a948e59bfd1e2502db6
Reviewed-on: https://boringssl-review.googlesource.com/6340
Reviewed-by: Adam Langley <alangley@gmail.com>
Add a slightly richer API. Notably, one can configure ssl_renegotiate_once to
only accept the first renego.
Also, this API doesn't repeat the mistake I made with
SSL_set_reject_peer_renegotiations which is super-confusing with the negation.
Change-Id: I7eb5d534e3e6c553b641793f4677fe5a56451c71
Reviewed-on: https://boringssl-review.googlesource.com/6221
Reviewed-by: Adam Langley <agl@google.com>
SSL 3.0 used to have a nice and simple rule around extensions. They don't
exist. And then RFC 5746 came along and made this all extremely confusing.
In an SSL 3.0 server, rather than blocking ServerHello extension
emission when renegotiation_info is missing, ignore all ClientHello
extensions but renegotiation_info. This avoids a mismatch between local
state and the extensions with emit.
Notably if, for some reason, a ClientHello includes the session_ticket
extension, does NOT include renegotiation_info or the SCSV, and yet the
client or server are decrepit enough to negotiate SSL 3.0, the
connection will fail due to unexpected NewSessionTicket message.
See https://crbug.com/425979#c9 for a discussion of something similar
that came up in diagnosing https://poodle.io/'s buggy POODLE check.
This is analogous to upstream's
5a3d8eebb7667b32af0ccc3f12f314df6809d32d.
(Not supporting renego as a server in any form anyway, we may as well
completely ignore extensions, but then our extensions callbacks can't
assume the parse hooks are always called. This way the various NULL
handlers still function.)
Change-Id: Ie689a0e9ffb0369ef7a20ab4231005e87f32d5f8
Reviewed-on: https://boringssl-review.googlesource.com/6180
Reviewed-by: Adam Langley <agl@google.com>
This change makes the runner tests (in ssl/test/runner) act like a
normal Go test rather than being a Go binary. This better aligns with
some internal tools.
Thus, from this point onwards, one has to run the runner tests with `go
test` rather than `go run` or `go build && ./runner`.
This will break the bots.
Change-Id: Idd72c31e8e0c2b7ed9939dacd3b801dbd31710dd
Reviewed-on: https://boringssl-review.googlesource.com/6009
Reviewed-by: Matt Braithwaite <mab@google.com>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Allow configuring digest preferences for the private key. Some
smartcards have limited support for signing digests, notably Windows
CAPI keys and old Estonian smartcards. Chromium used the supports_digest
hook in SSL_PRIVATE_KEY_METHOD to limit such keys to SHA1. However,
detecting those keys was a heuristic, so some SHA256-capable keys
authenticating to SHA256-only servers regressed in the switch to
BoringSSL. Replace this mechanism with an API to configure digest
preference order. This way heuristically-detected SHA1-only keys may be
configured by Chromium as SHA1-preferring rather than SHA1-requiring.
In doing so, clean up the shared_sigalgs machinery somewhat.
BUG=468076
Change-Id: I996a2df213ae4d8b4062f0ab85b15262ca26f3c6
Reviewed-on: https://boringssl-review.googlesource.com/5755
Reviewed-by: Adam Langley <agl@google.com>
SCT and OCSP are part of the session data and as such shouldn't be sent
again to the client when resuming.
Change-Id: Iaee3a3c4c167ea34b91504929e38aadee37da572
Reviewed-on: https://boringssl-review.googlesource.com/5900
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Last set of changes didn't do that.
Change-Id: Iae24e75103529ce4d50099c5cbfbcef0e10ba663
Reviewed-on: https://boringssl-review.googlesource.com/5871
Reviewed-by: Adam Langley <agl@google.com>
Change-Id: Ifa44fef160fc9d67771eed165f8fc277f28a0222
Reviewed-on: https://boringssl-review.googlesource.com/5840
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Applications may require the stapled OCSP response in order to verify
the certificate within the verification callback.
Change-Id: I8002e527f90c3ce7b6a66e3203c0a68371aac5ec
Reviewed-on: https://boringssl-review.googlesource.com/5730
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
This change adds the ability to configure ciphers specifically for
TLS ≥ 1.0. This compliments the existing ability to specify ciphers
for TLS ≥ 1.1.
This is useful because TLS 1.0 is the first version not to suffer from
POODLE. (Assuming that it's implemented correctly[1].) Thus one might
wish to reserve RC4 solely for SSLv3.
[1] https://www.imperialviolet.org/2014/12/08/poodleagain.html
Change-Id: I774d5336fead48f03d8a0a3cf80c369692ee60df
Reviewed-on: https://boringssl-review.googlesource.com/5793
Reviewed-by: Adam Langley <agl@google.com>
setup_key_block is called when the first CCS resolves, but for resumptions this
is the incoming CCS (see ssl3_do_change_cipher_spec). Rather than set
need_record_splitting there, it should be set in the write case of
tls1_change_cipher_state.
This fixes a crash from the new record layer code in resumption when
record-splitting is enabled. Tweak the record-splitting tests to cover this
case.
This also fixes a bug where renego from a cipher which does require record
splitting to one which doesn't continues splitting. Since version switches are
not allowed, this can only happen after a renego from CBC to RC4.
Change-Id: Ie4e1b91282b10f13887b51d1199f76be4fbf09ad
Reviewed-on: https://boringssl-review.googlesource.com/5787
Reviewed-by: Adam Langley <agl@google.com>
Note that DTLS treats oversized ciphertexts different from everything else.
Change-Id: I71cba69ebce0debdfc96a7fdeb2666252e8d28ed
Reviewed-on: https://boringssl-review.googlesource.com/5786
Reviewed-by: Adam Langley <agl@google.com>
If the two extensions select different next protocols (quite possible since one
is server-selected and the other is client-selected), things will break. This
matches the behavior of NSS (Firefox) and Go.
Change-Id: Ie1da97bf062b91a370c85c12bc61423220a22f36
Reviewed-on: https://boringssl-review.googlesource.com/5780
Reviewed-by: Adam Langley <agl@google.com>
The maximum buffer size computation wasn't quite done right in
ssl_buffer.c, so we were failing with BUFFER_TOO_SMALL for sufficiently
large records. Fix this and, as penance, add 103 tests.
(Test that we can receive maximum-size records in all cipher suites.
Also test SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER while I'm here.)
BUG=526998
Change-Id: I714c16dda2ed13f49d8e6cd1b48adc5a8491f43c
Reviewed-on: https://boringssl-review.googlesource.com/5785
Reviewed-by: Adam Langley <agl@google.com>
Now that it even works at all (type = 0 bug aside), add tests for it.
Test both close_notify being received before and after SSL_shutdown is
called. In the latter case, have the peer send some junk to be ignored
to test that works.
Also test that SSL_shutdown fails on unclean shutdown and that quiet
shutdowns ignore it.
BUG=526437
Change-Id: Iff13b08feb03e82f21ecab0c66d5f85aec256137
Reviewed-on: https://boringssl-review.googlesource.com/5769
Reviewed-by: Adam Langley <agl@google.com>
Our tests shouldn't panic if the program misbehaves.
Change-Id: I113e050222bcf48e5f25883f860dbc1c5c77e77e
Reviewed-on: https://boringssl-review.googlesource.com/5764
Reviewed-by: Adam Langley <agl@google.com>
The old empty record logic discarded the records at a very low-level.
Let the error bubble up to ssl3_read_bytes so the type mismatch logic
may kick in before the empty record is skipped.
Add tests for when the record in question is application data, before
before the handshake and post ChangeCipherSpec.
BUG=521840
Change-Id: I47dff389cda65d6672b9be39d7d89490331063fa
Reviewed-on: https://boringssl-review.googlesource.com/5754
Reviewed-by: Adam Langley <agl@google.com>
This made sense when the cipher might have been standardized as-is, so a
DHE_RSA variant could appease the IETF. Since the standardized variant is going
to have some nonce tweaks anyway, there's no sense in keeping this around. Get
rid of one non-standard cipher suite value early. (Even if they were to be
standardized as-is, it's not clear we should implement new DHE cipher suites at
this point.)
Chrome UMA, unsurprisingly, shows that it's unused.
Change-Id: Id83d73a4294b470ec2e94d5308fba135d6eeb228
Reviewed-on: https://boringssl-review.googlesource.com/5750
Reviewed-by: Adam Langley <agl@google.com>
This is a simpler implementation than OpenSSL's, lacking responder IDs
and request extensions support. This mirrors the client implementation
already present.
Change-Id: I54592b60e0a708bfb003d491c9250401403c9e69
Reviewed-on: https://boringssl-review.googlesource.com/5700
Reviewed-by: Adam Langley <agl@google.com>
Rather than sniff for ClientHello, just fall through to standard logic
once weird cases are resolved.
This means that garbage will now read as WRONG_VERSION rather than
UNKNOWN_PROTOCOL, but the rules here were slightly odd anyway. This also
means we'll now accept empty records before the ClientHello (up to the
empty record limit), and process records of the wrong type with the
usual codepath during the handshake.
This shouldn't be any more risk as it just makes the ClientHello more
consistent with the rest of the protocol. A TLS implementation that
doesn't parse V2ClientHello would do the same unless it still
special-cased the first record. All newly-exposed states are reachable
by fragmenting ClientHello by one byte and then sending the record in
question.
BUG=468889
Change-Id: Ib701ae5d8adb663e158c391639b232a9d9cd1c6e
Reviewed-on: https://boringssl-review.googlesource.com/5712
Reviewed-by: Adam Langley <agl@google.com>
Due to a typo, when a server sent an unknown extension, the extension
number would be taken from a NULL structure rather than from the
variable of the same name that's in the local scope.
BUG=517935
Change-Id: I29d5eb3c56cded40f6155a81556199f12439ae06
Reviewed-on: https://boringssl-review.googlesource.com/5650
Reviewed-by: Adam Langley <agl@google.com>
The existing tests only went monotonic. Allow an arbitrary mapping
function. Also test by sending more app data. The handshake is fairly
resilient to replayed packets, whereas our test code intentionally
isn't.
Change-Id: I0fb74bbacc260c65ec5f6a1ca8f3cb23b4192855
Reviewed-on: https://boringssl-review.googlesource.com/5556
Reviewed-by: Adam Langley <agl@google.com>
I don't think we had coverage for this check.
Change-Id: I5e454e69c1ee9f1b9760d2ef1431170d76f78d63
Reviewed-on: https://boringssl-review.googlesource.com/5544
Reviewed-by: Adam Langley <agl@google.com>
That got out of sync at some point.
Change-Id: I5a45f50f330ceb65053181afc916053a80aa2c5d
Reviewed-on: https://boringssl-review.googlesource.com/5541
Reviewed-by: Adam Langley <agl@google.com>
The RSA key exchange needs decryption and is still unsupported.
Change-Id: I8c13b74e25a5424356afbe6e97b5f700a56de41f
Reviewed-on: https://boringssl-review.googlesource.com/5467
Reviewed-by: Adam Langley <agl@google.com>
This change mirrors upstream's custom extension API because we have some
internal users that depend on it.
Change-Id: I408e442de0a55df7b05c872c953ff048cd406513
Reviewed-on: https://boringssl-review.googlesource.com/5471
Reviewed-by: Adam Langley <agl@google.com>
These were used in the upstream Go code to fuzz-test the handshake
marshal/unmarshal functions. But we don't do that there so best to
remove them.
(The ClientHello equals function is still used, however, to test DTLS
retransmission.)
Change-Id: I950bdf4f7eefa2bca13c10f5328d2e6c586604e2
Reviewed-on: https://boringssl-review.googlesource.com/5470
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Fastradio was a trick where the ClientHello was padding to at least 1024
bytes in order to trick some mobile radios into entering high-power mode
immediately. After experimentation, the feature is being dropped.
This change also tidies up a bit of the extensions code now that
everything is using the new system.
Change-Id: Icf7892e0ac1fbe5d66a5d7b405ec455c6850a41c
Reviewed-on: https://boringssl-review.googlesource.com/5466
Reviewed-by: Adam Langley <agl@google.com>
Historically we had a bug around this and this change implements a test
that we were previously carrying internally.
Change-Id: Id181fedf66b2b385b54131ac91d74a31f86f0205
Reviewed-on: https://boringssl-review.googlesource.com/5380
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
This change also switches the behaviour of the client. Previously the
client would send the SCSV rather than the extension, but now it'll only
do that for SSLv3 connections.
Change-Id: I67a04b8abbef2234747c0dac450458deb6b0cd0a
Reviewed-on: https://boringssl-review.googlesource.com/5143
Reviewed-by: Adam Langley <agl@google.com>
This test shouldn't trigger a renegotiation: the test is trying to
assert that without the legacy-server flag set, a server that doesn't
echo the renegotiation extension can't be connected to.
Change-Id: I1368d15ebc8f296f3ff07040c0e6c48fdb49e56f
Reviewed-on: https://boringssl-review.googlesource.com/5141
Reviewed-by: Adam Langley <agl@google.com>
Rather than rely on Chromium to query SSL_initial_handshake_complete in the
callback (which didn't work anyway because the callback is called afterwards),
move the logic into BoringSSL. BoringSSL already enforces that clients never
offer resumptions on renegotiation (it wouldn't work well anyway as client
session cache lookup is external), so it's reasonable to also implement
in-library that sessions established on a renegotiation are not cached.
Add a bunch of tests that new_session_cb is called when expected.
BUG=501418
Change-Id: I42d44c82b043af72b60a0f8fdb57799e20f13ed5
Reviewed-on: https://boringssl-review.googlesource.com/5171
Reviewed-by: Adam Langley <agl@google.com>
b4d65fda70 was written concurrently with
my updating runner to handle -resource-dir (in
7c803a65d5) and thus it didn't include the
needed change for the test that it added to handle it.
This change fixes that added test so that it can run with -resource-dir.
Change-Id: I06b0adfb3fcf3f11c061fe1c8332a45cd7cd2dbc
This adds a new API, SSL_set_private_key_method, which allows the consumer to
customize private key operations. For simplicity, it is incompatible with the
multiple slots feature (which will hopefully go away) but does not, for now,
break it.
The new method is only routed up for the client for now. The server will
require a decrypt hook as well for the plain RSA key exchange.
BUG=347404
Change-Id: I35d69095c29134c34c2af88c613ad557d6957614
Reviewed-on: https://boringssl-review.googlesource.com/5049
Reviewed-by: Adam Langley <agl@google.com>
