used with no explanation. Some of this was introduced as part of RT#1929. The
value 28 is the length of the IP header (20 bytes) plus the UDP header (8
bytes). However use of this constant is incorrect because there may be
instances where a different value is needed, e.g. an IPv4 header is 20 bytes
but an IPv6 header is 40. Similarly you may not be using UDP (e.g. SCTP).
This commit introduces a new BIO_CTRL that provides the value to be used for
this mtu "overhead". It will be used by subsequent commits.
Reviewed-by: NTim Hudson <tjh@openssl.org>

mtu that we have received is not less than the minimum. If its less it uses the
minimum instead. The second call to query the mtu does not do that, but
instead uses whatever comes back. We have seen an instance in RT#3592 where we
have got an unreasonably small mtu come back. This commit makes both query
checks consistent.
Reviewed-by: NTim Hudson <tjh@openssl.org>

automatically updated, and we should use the one provided instead.
Unfortunately there are a couple of locations where this is not respected.
Reviewed-by: NTim Hudson <tjh@openssl.org>

RT#3592 provides an instance where the OPENSSL_assert that this commit
replaces can be hit. I was able to recreate this issue by forcing the
underlying BIO to misbehave and come back with very small mtu values. This
happens the second time around the while loop after we have detected that the
MTU has been exceeded following the call to dtls1_write_bytes.
Reviewed-by: NTim Hudson <tjh@openssl.org>

If SSLv2 and SSLv3 are both disabled we still support SSL/TLS.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NTim Hudson <tjh@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>

Previously, state variant was not advanced, which resulted in state
being stuck in the st1 variant (usually "_A").

This broke certificate callback retry logic when accepting connections
that were using SSLv2 ClientHello (hence reusing the message), because
their state never advanced to SSL3_ST_SR_CLNT_HELLO_C variant required
for the retry code path.

Reported by Yichun Zhang (agentzh).
Signed-off-by: NPiotr Sikora <piotr@cloudflare.com>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>

The current documentation contains a bunch of spelling and grammar mistakes. I also
found it hard to understand some paragraphs, so here is my attempt to improve its
readability.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

PR#1767
Reviewed-by: NRichard Levitte <levitte@openssl.org>

PR#3613
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

PR#3612
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Workaround for NetWare CodeWarrior compiler which doesn't properly lookup
includes when in same directory as the C file which includes it.

PR#3569
Reviewed-by: NStephen Henson <steve@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Minor changes made by Matt Caswell
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Minor changes made by Matt Caswell.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Minor changes made by Matt Caswell.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

PR#3608
Reviewed-by: NTim Hudson <tjh@openssl.org>

PR#3574
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

When using the -xcert option to test certificate validity print out
if we pass Suite B compliance. We print out "not tested" if we aren't
in Suite B mode.
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>

In keygen, return KEY_SIZE_TOO_SMALL not INVALID_KEYBITS.

** I also increased the minimum from 256 to 512, which is now
documented in CHANGES file. **
Reviewed-by: NMatt Caswell <matt@openssl.org>

Fix CONF_load_modules to CONF_modules_load.
Document that it calls exit.
Advise against using it now.
Add an error print to stderr.
Reviewed-by: NMatt Caswell <matt@openssl.org>

the session's version (server).

See also BoringSSL's commit bdf5e72f50e25f0e45e825c156168766d8442dde.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

ECDH_compute_key is silently ignored and the KDF is run on duff data

Thanks to github user tomykaira for the suggested fix.
Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>

once the ChangeCipherSpec message is received. Previously, the server would
set the flag once at SSL3_ST_SR_CERT_VRFY and again at SSL3_ST_SR_FINISHED.
This would allow a second CCS to arrive and would corrupt the server state.

(Because the first CCS would latch the correct keys and subsequent CCS
messages would have to be encrypted, a MitM attacker cannot exploit this,
though.)

Thanks to Joeri de Ruiter for reporting this issue.
Reviewed-by: NMatt Caswell <matt@openssl.org>

The server must send a NewSessionTicket message if it advertised one
in the ServerHello, so make a missing ticket message an alert
in the client.

An equivalent change was independently made in BoringSSL, see commit
6444287806d801b9a45baf1f6f02a0e3a16e144c.
Reviewed-by: NMatt Caswell <matt@openssl.org>

The client sends a session ID with the session ticket, and uses
the returned ID to detect resumption, so we do not need to peek
at handshake messages: s->hit tells us explicitly if we're resuming.

An equivalent change was independently made in BoringSSL, see commit
407886f589cf2dbaed82db0a44173036c3bc3317.
Reviewed-by: NMatt Caswell <matt@openssl.org>

The same change was independently made in BoringSSL, see commit
9eaeef81fa2d4fd6246dc02b6203fa936a5eaf67
Reviewed-by: NMatt Caswell <matt@openssl.org>

This ensures that it's zeroed even if the SSL object is reused
(as in ssltest.c). It also ensures that it applies to DTLS, too.
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

If no keyfile has been specified use the certificate file instead.

Fix typo: we need to check the chain is not NULL, not the chain file.
Reviewed-by: NMatt Caswell <matt@openssl.org>

(cherry picked from commit 786370b1b09b919d9306f27336e13783e4fe3fd0)

When no-ssl3 is set only make SSLv3 disabled by default. Retain -ssl3
options for s_client/s_server/ssltest.

When no-ssl3-method is set SSLv3_*method() is removed and all -ssl3
options.

We should document this somewhere, e.g. wiki, FAQ or manual page.
Reviewed-by: NEmilia Käsper <emilia@openssl.org>