domd: Do not needlessly overwrite Makefiles

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1370)

mklink: Do not needlessly overwrite linked files...

... on systems without symlinks.

Overwriting all the headers on each Configure causes full rebuild even if
nothing has changed.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1370)

Configure: Improve incremental build time

When Makefile/opensslconf.h is unchanged, don't write it at all.

Currently every time Configure is executed, these files are overwritten.
Makefile leads to regeneration of buildinf.h, and opensslconf.h is itself
a central header.

As a result, Configure triggers full rebuild, even if nothing is changed.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1370)

Check return value of some BN functions.

Factorise multiple bn_get_top(group->field) calls
Add missing checks on some conditional BN_copy return value
Add missing checks on some BN_copy return value
Add missing checks on a few bn_wexpand return value

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1626)
(cherry picked from commit 78e09b53a40729f5e99829ccc733b592bd22fea1)

Solution proposal for issue #1647.

Avoid a memory alignment issue.

Signed-off-by: Matthias Kraft <Matthias.Kraft@softwareag.com>
CLA: trivial
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1650)

Update CHANGES and NEWS

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

bn/asm/x86_64-mont.pl: fix for CVE-2016-7055 (Low severity).

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 2fac86d9abeaa643677d1ffd0a139239fdf9406a)

Makefile.org: clear APPS environment variable.

Build failure was reported in GH#1818 if APPS environment was defined.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1864)

Missed a mention of RT

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1849)
(cherry picked from commit 1e62cc12f35408508594be254f40bf9b65d2a3a9)

Add a CHANGES entry for the unrecognised record type change

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

Fail if an unrecognised record type is received

TLS1.0 and TLS1.1 say you SHOULD ignore unrecognised record types, but
TLS 1.2 says you MUST send an unexpected message alert. We swap to the
TLS 1.2 behaviour for all protocol versions to prevent issues where no
progress is being made and the peer continually sends unrecognised record
types, using up resources processing them.

Issue reported by 郭志攀

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

Fix heartbeat_test

The heartbeat_test reaches into the internals of libssl and calls some
internal functions. It then checks the return value to check its what it
expected. However commit fa4c37457 changed the return value of these
internal functions, and now the test is failing.

The solution is to update the test to look for the new return value.

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

Secure our notification email.

Forks will have to define their own

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1821)
(cherry picked from commit 5e28b1c1e048eef600dc49820934a5e1531186d4)

Fix grammar-o in CONTRIBUTING

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1625)
(cherry picked from commit e4d94269a5a41594852dc60716500580f1d47cef)

Add $(EX_LIBS) to the LIBDEPS for libgost.so, just as for all other engines

Without this, any linker flag the user gave when configuring are ignored.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1803)

Implement length checks as a macro

Replace the various length checks in the extension code with a macro to
simplify the logic.

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

Ensure we have length checks for all extensions

The previous commit inspired a review of all the length checks for the
extension adding code. This adds more robust checks and adds checks where
some were missing previously. The real solution for this is to use WPACKET
which is currently in master - but that cannot be applied to release
branches.

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

Fix length check writing status request extension

The status request extension did not correctly check its length, meaning
that writing the extension could go 2 bytes beyond the buffer size. In
practice this makes little difference because, due to logic in buffer.c the
buffer is actually over allocated by approximately 5k!

Issue reported by Guido Vranken.

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

Fix a double free in ca command line

Providing a spkac file with no default section causes a double free.

Thanks to Brian Carpenter for reporting this issue.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
(cherry picked from commit 229bd12487f8576fc088dc4f641950ac33c62033)

A zero return from BIO_read/BIO_write() could be retryable

A zero return from BIO_read()/BIO_write() could mean that an IO operation
is retryable. A zero return from SSL_read()/SSL_write() means that the
connection has been closed down (either cleanly or not). Therefore we
should not propagate a zero return value from BIO_read()/BIO_write() back
up the stack to SSL_read()/SSL_write(). This could result in a retryable
failure being treated as fatal.

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

Fix typo (reported by Matthias St. Pierre)

Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 12a7715e3daed439e46cbed461d2a3d9dfd37c0f)

Fix leak of secrecy in ecdh_compute_key()

A temporary buffer containing g^xy was not cleared in ecdh_compute_key()
before freeing it, so the shared secret was leaked in memory.

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>

Correctly find all critical CRL extensions

Unhandled critical CRL extensions were not detected if they appeared
after the handled ones.  (GitHub issue 1757).  Thanks to John Chuah
for reporting this.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1769)

remove redundant zero assignments

The structure has already been initialized to zero with memset.
See also commit 64b25758edca688a30f02c260262150f7ad0bc7d (remove 0 assignments)

Signed-off-by: Cristian Stoica <cristian.stoica@nxp.com>
CLA: trivial
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1463)

%p takes void*, so make sure to cast arguments to void*

This avoids failures when configuring with --strict-warnings

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1749)

apps: make setup_engine() and release_engine() available always

This removes some #ifndef clutter.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1644)

If an engine comes up explicitely, it must also come down explicitely

In apps/apps.c, one can set up an engine with setup_engine().
However, we freed the structural reference immediately, which means
that for engines that don't already have a structural reference
somewhere else (because it has registered at least one cipher or digest
algorithm method, and therefore gets a functional reference through the
ENGINE_set_default() call), we end up returning an invalid reference.

Instead, the function release_engine() is added, and called at the end
of the routines that call setup_engine().

Originally, the ENGINE API wasn't designed for this to happen, an
engine had to register at least one algorithm method, and was
especially expected to register the algorithms corresponding to the
key types that could be stored and hidden in hardware.  However, it
turns out that some engines will not register those algorithms with
the ENGINE_set_{algo}, ENGINE_set_cipher or ENGINE_set_digest
functions, as they only want the methods to be used for keys, not as
general crypto accelerator methods.  That may cause ENGINE_set_default()
to do nothing, and no functional reference is therefore made, leading
to a premature deallocation of the engine and it thereby becoming
unavailable when trying to fetch a key.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1644)

Fix no-des

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1748)

Make 'openssl prime ""' not segfault

Fixes RT#4699

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1668)

Fix strict-warnings build

crypto/evp/e_aes.c: Types of inp and out parameters of AES_xts_en/decrypt
functions need to be changed from char to unsigned char to avoid build
error due to -Werror=incompatible-pointer-types.

crypto/aes/asm/aes-s390x.pl: Comments need to reflect the above change.

Signed-off-by: Patrick Steuer <psteuer@mail.de>
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial

Fix strict-warnings build

crypto/s390xcap.c: cryptlib.h needs to be included for OPENSSL_cpuid_setup
function prototype is located there to avoid build error due to
-Werror=missing-prototypes.

Signed-off-by: Patrick Steuer <psteuer@mail.de>
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
CLA: trivial

Fix signatures of EVP_Digest{Sign,Verify}Update

These are implemented as macros delegating to `EVP_DigestUpdate`, which
takes a `size_t` as its third argument, not an `unsigned int`.

CLA: trivial

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 8bdce8d160e29b4e1b80fec31f618d85d8c2b7a8)

Ensure we handle len == 0 in ERR_err_string_n

If len == 0 in a call to ERR_error_string_n() then we can read beyond the
end of the buffer. Really applications should not be calling this function
with len == 0, but we shouldn't be letting it through either!

Thanks to Agostino Sarubbo for reporting this issue. Agostino's blog on
this issue is available here:
https://blogs.gentoo.org/ago/2016/10/14/openssl-libcrypto-stack-based-buffer-overflow-in-err_error_string_n-err-c/

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit e5c1361580d8de79682958b04a5f0d262e680f8b)

Degrade 3DES to MEDIUM in SSL2

The SWEET32 fix moved 3DES from HIGH to MEDIUM, but omitted SSL2.

CLA: trivial
Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1683)

RT is put out to pasture

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1702)
(cherry picked from commit 7954dced19a7e59e7055eab95a981fa943c7d100)

Add missing error string for SSL_R_TOO_MANY_WARN_ALERTS

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

apps/apps.c: initialize and de-initialize engine around key loading

Before loading a key from an engine, it may need to be initialized.
When done loading the key, we must de-initialize the engine.
(if the engine is already initialized somehow, only the reference
counter will be incremented then decremented)

Reviewed-by: Stephen Henson <steve@openssl.org>
(cherry picked from commit 49e476a5382602d0bad1139d6f1f66ddbc7959d6)

Revert "Call ENGINE_init() before trying to use keys from engine"

This reverts commit 4badd2b3c29c2c6c551c737c07a429a53d9d1a0d.
This fails to call ENGINE_finish; an alternate fix is coming.

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

Call ENGINE_init() before trying to use keys from engine

Things like 'openssl s_client' only ever worked with keys from an engine
which provided a default generic method for some key type — because it
called ENGINE_set_default() and that ended up being an implicit
initialisation and functional refcount.

But an engine which doesn't provide generic methods doesn't get
initialised, and then when you try to use it you get an error:

cannot load client certificate private key file from engine
140688147056384:error:26096075:engine routines:ENGINE_load_private_key:not initialised:crypto/engine/eng_pkey.c:66:
unable to load client certificate private key file

cf. https://github.com/OpenSC/libp11/issues/107 (in which we discover
that engine_pkcs11 *used* to provide generic methods that OpenSSL would
try to use for ephemeral DH keys when negotiating ECDHE cipher suites in
TLS, and that didn't work out very well.)

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1640)

Fix NEWS error

The NEWS file referenced the wrong CVE for 1.0.2

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

Prepare for 1.0.2k-dev

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

Prepare for 1.0.2j release

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

Update CHANGES and NEWS for the new release

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

Add some sanity checks when checking CRL scores

Note: this was accidentally omitted from OpenSSL 1.0.2 branch.
Without this fix any attempt to use CRLs will crash.

CVE-2016-7052

Thanks to Bruce Stephens and Thomas Jakobi for reporting this issue.

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

Fix build with no-nextprotoneg

Add a missing ifdef. Same change is already present in master.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1100)

Fix typo introduced by a03f81f4

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

Prepare for 1.0.2j-dev

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

Prepare for 1.0.2i release

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

Updates CHANGES and NEWS for new release

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

Avoid KCI attack for GOST

Russian GOST ciphersuites are vulnerable to the KCI attack because they use
long-term keys to establish the connection when ssl client authorization is
on. This change brings the GOST implementation into line with the latest
specs in order to avoid the attack. It should not break backwards
compatibility.

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

Fix a mem leak in NPN handling

If a server sent multiple NPN extensions in a single ClientHello then a
mem leak can occur. This will only happen where the client has requested
NPN in the first place. It does not occur during renegotiation. Therefore
the maximum that could be leaked in a single connection with a malicious
server is 64k (the maximum size of the ServerHello extensions section). As
this is client side, only occurs if NPN has been requested and does not
occur during renegotiation this is unlikely to be exploitable.

Issue reported by Shi Lei.

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

Fix OCSP Status Request extension unbounded memory growth

A malicious client can send an excessively large OCSP Status Request
extension. If that client continually requests renegotiation,
sending a large OCSP Status Request extension each time, then there will
be unbounded memory growth on the server. This will eventually lead to a
Denial Of Service attack through memory exhaustion. Servers with a
default configuration are vulnerable even if they do not support OCSP.
Builds using the "no-ocsp" build time option are not affected.

I have also checked other extensions to see if they suffer from a similar
problem but I could not find any other issues.

CVE-2016-6304

Issue reported by Shi Lei.

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

mk1mf.pl: check for no-tls1 here as well

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

Don't allow too many consecutive warning alerts

Certain warning alerts are ignored if they are received. This can mean that
no progress will be made if one peer continually sends those warning alerts.
Implement a count so that we abort the connection if we receive too many.

Issue reported by Shi Lei.

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

Make message buffer slightly larger than message.

Grow TLS/DTLS 16 bytes more than strictly necessary as a precaution against
OOB reads. In most cases this will have no effect because the message buffer
will be large enough already.

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

Use SSL3_HM_HEADER_LENGTH instead of 4.

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

Remove unnecessary check.

The overflow check will never be triggered because the
the n2l3 result is always less than 2^24.

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

Dcoument -alpn flag

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 776e15f9393a9e3083bec60a8da376ce2fe1e97e)

GH1555: Don't bump size on realloc failure

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 6fcace45bda108ad4d3f95261494dd479720d92c)

apps/apps.c: include sys/socket.h to declare recv()

Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit a19228b7f4fc6fcb49713455b3caedbc24fb0b01)

Fix small OOB reads.

In ssl3_get_client_certificate, ssl3_get_server_certificate and
ssl3_get_certificate_request check we have enough room
before reading a length.

Thanks to Shi Lei (Gear Team, Qihoo 360 Inc.) for reporting these bugs.

CVE-2016-6306

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

Fix a missing NULL check in dsa_builtin_paramgen

We should check the last BN_CTX_get() call to ensure that it isn't NULL
before we try and use any of the allocated BIGNUMs.

Issue reported by Shi Lei.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 1ff7425d6130380bb00d3e64739633a4b21b11a3)

RT4669: dgst can only sign/verify one file

Check arg count and print an error message.

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

initialize the RSA struct to 0.

This helps with program code linked against static builds accessing a uninitialized ->engine pointer.

CLA: none; trivial

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1540)

update default dependencies

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

Revert "Abort on unrecognised warning alerts"

This reverts commit 15d81749322c3498027105f8ee44e8c25479d475.

There were some unexpected side effects to this commit, e.g. in SSLv3 a
warning alert gets sent "no_certificate" if a client does not send a
Certificate during Client Auth. With the above commit this causes the
connection to abort, which is incorrect. There may be some other edge cases
like this so we need to have a rethink on this.

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

Finally, make sure vms_term_sock.c is built

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

Refactor to avoid unnecessary preprocessor logic

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

Reformat to fit OpenSSL source code standards

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

Remove entirely unnecessary pointer size guards

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

Add copyright and license on apps/vms_term_sock.[ch]

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

VSI submission: redirect terminal input through socket

This is needed, because on VMS, select() can only be used on sockets.  being
able to use select() on all kinds of file descriptors is unique to Unix.

So, the solution for VMS is to create a layer that translates input from
standard input to socket communication.

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

Fix memory leak on realloc error.

Backport leak fix from master branch.

Thanks to Shi Lei (Gear Team, Qihoo 360 Inc.) for reporting this bug.

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

Fix memory leak on error.

Thanks to Shi Lei (Gear Team, Qihoo 360 Inc.) for reporting this bug.

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

VMS: only use _realloc32 with /POINTER_SIZE=32

This fixes the following error when building with no particular pointer size
is specified (implied 32 bit):

    static void *(*realloc_func) (void *, size_t) = realloc;
    ................................................^
    %CC-E-UNDECLARED, In the initializer for realloc_func, "_realloc32" is not declared.
    at line number 93 in file DEV:[OPENSSL102.crypto]mem.c;1

Reviewed-by: Andy Polyakov <appro@openssl.org>

Add some sanity checks around usage of t_fromb64()

The internal SRP function t_fromb64() converts from base64 to binary. It
does not validate that the size of the destination is sufficiently large -
that is up to the callers. In some places there was such a check, but not
in others.

Add an argument to t_fromb64() to provide the size of the destination
buffer and validate that we don't write too much data. Also add some sanity
checks to the callers where appropriate.

With thanks to Shi Lei for reporting this issue.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 73f0df8331910d6726d45ecaab12bd93cc48b4e2)

Abort on unrecognised warning alerts

A peer continually sending unrecognised warning alerts could mean that we
make no progress on a connection. We should abort rather than continuing if
we receive an unrecognised warning alert.

Thanks to Shi Lei for reporting this issue.

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

Add enginesdir to libcrypto.pc pkg-config file

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

Fix memory leak on error.

Backport leak fix from master branch.

Thanks to Shi Lei for reporting this bug.

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

Make update

Reviewed-by: Andy Polyakov <appro@openssl.org>

If errno is ENXIO in BSS_new_file(), set BIO_R_NO_SUCH_FILE

VMS sets that errno when the device part of a file spec is malformed
or a logical name that doesn't exist.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit e82e2186e93e9a678dd8c0c5ba084d21d27d4d62)

Avoid EVP_PKEY_cmp() crash on EC keys without public component

Some hardware devices don't provide the public EC_POINT data. The only
way for X509_check_private_key() to validate that the key matches a
given certificate is to actually perform a sign operation and then
verify it using the public key in the certificate.

Maybe that can come later, as discussed in issue 1532. But for now let's
at least make it fail gracefully and not crash.

GH: 1532

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1547)
(cherry picked from commit 92ed7fa575a80955f3bb6efefca9bf576a953586)

Misc BN fixes

Never output -0; make "negative zero" an impossibility.
Do better checking on BN_rand top/bottom requirements and #bits.
Update doc.
Ignoring trailing garbage in BN_asc2bn.

Port this commit from boringSSL: https://boringssl.googlesource.com/boringssl/+/899b9b19a4cd3fe526aaf5047ab9234cdca19f7d%5E!/
        Ensure |BN_div| never gives negative zero in the no_branch code.

        Have |bn_correct_top| fix |bn->neg| if the input is zero so that we
        don't have negative zeros lying around.

        Thanks to Brian Smith for noticing.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 01c09f9fde5793e0b3712d602b02e2aed4908e8d)
(Some manual work required)

crypto/bn/*: x86[_64] division instruction doesn't handle constants, change constraint from 'g' to 'r'.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 68b4a6e91f5acd42489bb9d1c580acc5ae457cad)

Ensure the CertStatus message adds a DTLS message header where needed

The function tls_construct_cert_status() is called by both TLS and DTLS
code. However it only ever constructed a TLS message header for the message
which obviously failed in DTLS.

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

SRP_create_verifier does not check for NULL before OPENSSL_cleanse

OPENSSL_cleanse() does not validate its input parameter for NULL so
SRP_create_verifier() should do so instead. Otherwise a segfault will
result.

Alternative solution to GitHub PR#1006

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

Improve the definition of STITCHED_CALL in e_rc4_hmac_md5.c

The definition of STITCHED_CALL relies on OPENSSL_NO_ASM.  However,
when a configuration simply lacks the assembler implementation for RC4
(which is where we have implemented the stitched call), OPENSSL_NO_ASM
isn't implemented.  Better, then, to rely on specific macros that
indicated that RC4 (and MD5) are implemented in assembler.

For this to work properly, we must also make sure Configure adds the
definition of RC4_ASM among the C flags.

(partly cherry picked from commit 216e8d91033d237880cff7da0d02d46d47bae41b)

Reviewed-by: Andy Polyakov <appro@openssl.org>

Fix a few leaks in X509_REQ_to_X509.
Fix a possible leak on NETSCAPE_SPKI_verify failure.

Backport of 0517538d1a39bc
Backport of f6c006ea76304a

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

Add basic test for Cisco DTLS1_BAD_VER and record replay handling

(Modified for 1.0.2 by adding selected PACKET_xx() functions and PRF, and
subsequent cleanup from commit eb633d03fe2db3666840dee8d0a2dbe491672dfc)

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 40425899200a3dea9ec3684d3eb80bcf50c99baf)

Fix ubsan 'left shift of negative value -1' error in satsub64be()

Baroque, almost uncommented code triggers behaviour which is undefined
by the C standard. You might quite reasonably not care that the code was
broken on ones-complement machines, but if we support a ubsan build then
we need to at least pretend to care.

It looks like the special-case code for 64-bit big-endian is going to
behave differently (and wrongly) on wrap-around, because it treats the
values as signed. That seems wrong, and allows replay and other attacks.
Surely you need to renegotiate and start a new epoch rather than
wrapping around to sequence number zero again?

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 2e94723c1b5d8ab974645e83de90b248265af3cd)

Fix SSL_export_keying_material() for DTLS1_BAD_VER

Commit d8e8590e ("Fix missing return value checks in SCTP") made the
DTLS handshake fail, even for non-SCTP connections, if
SSL_export_keying_material() fails. Which it does, for DTLS1_BAD_VER.

Apply the trivial fix to make it succeed, since there's no real reason
why it shouldn't even though we never need it.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit c8a18468caef4d62778381be0acdadc8a88d6e51)

Fix the no-tls1 option

This also fixes no-tls which is an alias for no-tls1 in 1.0.2 (it is not
possible to do no-tls1_1 or no-tls1_2 in 1.0.2).

Because it is not possible to disable TLS1.1 or TLS1.2 it no longer follows
that disabling TLS1.0 should force the disabling of tlsext.

Also a few missing ifdef guards.

GitHub Iusse#935

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

ec/asm/ecp_nistz256-x86_64.pl: /cmovb/cmovc/ as nasm doesn't recognize cmovb.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit d3034d31e7c04b334dd245504dd4f56e513ca115)

ec/ecp_nistz256: harmonize is_infinity with ec_GFp_simple_is_at_infinity.

RT#4625

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit e3057a57caf4274ea1fb074518e4714059dfcabf)

ec/asm/ecp_nistz256-x86_64.pl: addition to perform stricter reduction.

Addition was not preserving inputs' property of being fully reduced.

Thanks to Brian Smith for reporting this.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit b62b2454fadfccaf5e055a1810d72174c2633b8f)

Always use session_ctx when removing a session

Sessions are stored on the session_ctx, which doesn't change after
SSL_set_SSL_CTX().

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

Avoid overflow in MDC2_Update()

Thanks to Shi Lei for reporting this issue.

CVE-2016-6303

Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 55d83bf7c10c7b205fffa23fa7c3977491e56c07)

SWEET32 (CVE-2016-2183): Move DES from HIGH to MEDIUM

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>

Fix no-ec

Use a ciphersuite in dtlstest that is not affected by no-* options.
Backport of commit fe34735c19.

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

Sanity check ticket length.

If a ticket callback changes the HMAC digest to SHA512 the existing
sanity checks are not sufficient and an attacker could perform a DoS
attack with a malformed ticket. Add additional checks based on
HMAC size.

Thanks to Shi Lei for reporting this bug.

CVE-2016-6302

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