This adds a test for CVE-2015-1793. This adds a new test file
verify_extra_test.c, which could form the basis for additional
verification tests.

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

During certificate verfification, OpenSSL will attempt to find an
alternative certificate chain if the first attempt to build such a chain
fails. An error in the implementation of this logic can mean that an
attacker could cause certain checks on untrusted certificates to be
bypassed, such as the CA flag, enabling them to use a valid leaf
certificate to act as a CA and "issue" an invalid certificate.

This occurs where at least one cert is added to the first chain from the
trust store, but that chain still ends up being untrusted. In that case
ctx->last_untrusted is decremented in error.

Patch provided by the BoringSSL project.

CVE-2015-1793

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

In CCM mode don't require a tag before initialising decrypt: this allows
the tag length to be set without requiring the tag.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 9cca7be1)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 5727582c)

The PSK identity hint should be stored in the SSL_SESSION structure
and not in the parent context (which will overwrite values used
by other SSL structures with the same SSL_CTX).

Use BUF_strndup when copying identity as it may not be null terminated.

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

Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 5fced239)

PR#3923

Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit ffbf304d)

Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 77672802)

Signed-off-by: Rich Salz <rsalz@akamai.com>
Reviewed-by: Matt Caswell <matt@openssl.org>

Found by Kurt Cancemi

(Manual cherry-pick of f8e427154bbc0c33f29fa7aad001b1b655e5995b)
Reviewed-by: Matt Caswell <matt@openssl.org>

Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 2d540402)

Reviewed-by: Rich Salz <rsalz@openssl.org>

A small rearrangement so the inclusion of rsaz_exp.h would be
unconditional, but what that header defines becomes conditional.

This solves the weirdness where rsaz_exp.h gets in and out of the
dependency list for bn_exp.c, depending on the present architecture.

Reviewed-by: Rich Salz <rsalz@openssl.org>

Typo in local variable name; introduced by previous fix.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit cc3f3fc2)

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 75ba5c58)

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 7fba8407)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 8ca96efd)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit d62c98c8)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 96462695)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 7a1789d2)

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit f4c73bfe)

Conflicts:
	crypto/threads/mttest.c

More fprintf()s and printf()s to turn into BIO calls.

Reviewed-by: Rich Salz <rsalz@openssl.org>

Construct bio_err and bio_stdout from file handles instead of FILE
pointers, since the latter might not be implemented (when OPENSSL_NO_STDIO
is defined).
Convert all output to use BIO_printf.
Change lh_foo to lh_SSL_SESSION_foo.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit bb8abd67)

Conflicts:
	crypto/threads/mttest.c

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 5c78e183)

Conflicts:
	crypto/threads/mttest.c

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit a3f92865)

Backport to 1.0.1 and 1.0.2 to fix RT 3905

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

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit bc9567cd)

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
(cherry picked from commit b4f0d1a4)

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
(cherry picked from commit 30cf9178)

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

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

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

It is valid for an extension block to be present in a ClientHello, but to
be of zero length.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>

Recent HMAC changes broke ABI compatibility due to a new field in HMAC_CTX.
This backs that change out, and does it a different way.

Thanks to Timo Teras for the concept.

Conflicts:
	crypto/hmac/hmac.c

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

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

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

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

CVE-2015-1788

Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 4924b37e)

Updates to CHANGES and NEWS to take account of the latest security fixes.

Reviewed-by: Rich Salz <rsalz@openssl.org>

CVE-2015-1790

Reviewed-by: Rich Salz <rsalz@openssl.org>