Check session_cert is not NULL before dereferencing it.

Unnecessary recursion when receiving a DTLS hello request can be used to
crash a DTLS client. Fixed by handling DTLS hello request without recursion.

Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.

Return a fatal error if an attempt is made to use a zero length
master secret.

Only accept change cipher spec when it is expected instead of at any
time. This prevents premature setting of session keys before the master
secret is determined which an attacker could use as a MITM attack.

Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for reporting this issue
and providing the initial fix this patch is based on.

A buffer overrun attack can be triggered by sending invalid DTLS fragments
to an OpenSSL DTLS client or server. This is potentially exploitable to
run arbitrary code on a vulnerable client or server.

Fixed by adding consistency check for DTLS fragments.

Thanks to Jüri Aedla for reporting this issue.

(cherry picked from commit 7d89b3bf42e4b4067371ab33ef7631434e41d1e4)

PR#3286
(cherry picked from commit 71e95000afb2227fe5cac1c79ae884338bcd8d0b)

PR#3302
(cherry picked from commit 9717f01951f976f76dd40a38d9fc7307057fa4c4)

Delays the queue insertion until after the ssl3_setup_buffers() call due to use-after-free bug. PR#3362

(cherry picked from commit ea2bb861f0daaa20819bf9ac8c146f7593feacd4)

Conflicts:

	apps/s_cb.c
(cherry picked from commit 14dc83ca779e91a267701a1fb05b2bbcf2cb63c4)

Add TLS padding extension to SSL_OP_ALL so it is used with other
"bugs" options and can be turned off.

This replaces SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG which is an ancient
option referring to SSLv2 and SSLREF.

PR#3336

(cherry picked from commit 3009244d)

Make sure there is an extra 4 bytes for server done message when
NETSCAPE_HANG_BUG is defined.

PR#3361

PR#3313
(cherry picked from commit 7e2c6f7e)

PR#3319
(cherry picked from commit 84691390eae86befd33c83721dacedb539ae34e6)

(cherry picked from commit 2c575907d2c8601a18716f718ce309ed4e1f1783)

the verify app man page didn't describe the usage of attime option
even though it was listed as a valid option in the -help message.

This patch fixes this omission.

While the -help message references this option, the man page
doesn't mention the -no_ecdhe option.
This patch fixes this omission.

PR#3249
(cherry picked from commit 8909bf20269035d295743fca559207ef2eb84eb3)

PR#3278
(cherry picked from commit de56fe797081fc09ebd1add06d6e2df42a324fd5)

(cherry picked from commit 3820fec3a09faecba7fe9912aa20ef7fcda8337b)

Replaces the entire test with a trivial implementation when
OPENSSL_NO_HEARTBEATS is defined.

Use triple DES for certificate encryption if no-rc2 is
specified.

PR#3357
(cherry picked from commit 4689c08453e95eeefcc88c9f32dc6e509f95caff)

PR#3357
(cherry picked from commit ca3ffd9670f2b589bf8cc04923f953e06d6fbc58)

(cherry picked from commit dcca7b13)

Regression test against CVE-2014-0160 (Heartbleed).

More info: http://mike-bland.com/tags/heartbleed.html

(based on commit 35cb55988b75573105eefd00d27d0138eebe40b1)

Moved note about lack of support for AEAD modes out of BUGS section to SUPPORTED CIPHERS section (bug has been fixed, but still no support for AEAD)