In PKCS#7, the ASN.1 content component is optional.
This typically applies to inner content (detached signatures),
however we must also handle unexpected missing outer content
correctly.

This patch only addresses functions reachable from parsing,
decryption and verification, and functions otherwise associated
with reading potentially untrusted data.

Correcting all low-level API calls requires further work.

CVE-2015-0289

Thanks to Michal Zalewski (Google) for reporting this issue.

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

Fix segmentation violation when ASN1_TYPE_cmp is passed a boolean type. This
can be triggered during certificate verification so could be a DoS attack
against a client or a server enabling client authentication.

CVE-2015-0286

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

If client auth is used then a server can seg fault in the event of a DHE
cipher being used and a zero length ClientKeyExchange message being sent
by the client. This could be exploited in a DoS attack.

CVE-2015-1787

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

If a client renegotiates using an invalid signature algorithms extension
it will crash a server with a NULL pointer dereference.

Thanks to David Ramos of Stanford University for reporting this bug.

CVE-2015-0291

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

Fix a bug where invalid PSS parameters are not rejected resulting in a
NULL pointer exception. This can be triggered during certificate
verification so could be a DoS attack against a client or a server
enabling client authentication.

Thanks to Brian Carpenter for reporting this issues.

CVE-2015-0208

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

CVE-2015-0287

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

The DTLSv1_listen function is intended to be stateless and processes
the initial ClientHello from many peers. It is common for user code to
loop over the call to DTLSv1_listen until a valid ClientHello is received
with an associated cookie. A defect in the implementation of DTLSv1_listen
means that state is preserved in the SSL object from one invokation to the
next that can lead to a segmentation fault. Erorrs processing the initial
ClientHello can trigger this scenario. An example of such an error could
be that a DTLS1.0 only client is attempting to connect to a DTLS1.2 only
server.

CVE-2015-0207

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

OpenSSL 1.0.2 introduced the "multiblock" performance improvement. This
feature only applies on 64 bit x86 architecture platforms that support AES
NI instructions. A defect in the implementation of "multiblock" can cause
OpenSSL's internal write buffer to become incorrectly set to NULL when
using non-blocking IO. Typically, when the user application is using a
socket BIO for writing, this will only result in a failed connection.
However if some other BIO is used then it is likely that a segmentation
fault will be triggered, thus enabling a potential DoS attack.

CVE-2015-0290

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

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

./config would translate -d into having the target get a 'debug-'
prefix, and then run './Configure LIST' to find out if such a
debugging target exists or not.

With the recent changes, the separate 'debug-foo' targets are
disappearing, and we're giving the normal targets debugging
capabilities instead.  Unfortunately, './config' wasn't changed to
match this new behavior.

This change introduces the arguments '--debug' and '--release' - the
latter just for orthogonality - to ./Configure, and ./config now
treats -d by adding '--debug' to the options for ./Configure.

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

Some miscellaneous removal of dead code from apps. Also fix an issue with
error handling with pkcs7.

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

Some miscellaneous removal of dead code from lib crypto.

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

In the probable_prime() function we behave slightly different if the number
of bits we are interested in is <= BN_BITS2 (the num of bits in a BN_ULONG).
As part of the calculation we work out a size_limit as follows:

    size_limit = (((BN_ULONG)1) << bits) - BN_get_word(rnd) - 1;

There is a problem though if bits == BN_BITS2. Shifting by that much causes
undefined behaviour. I did some tests. On my system BN_BITS2 == 64. So I
set bits to 64 and calculated the result of:

    (((BN_ULONG)1) << bits)

I was expecting to get the result 0. I actually got 1! Strangely this...

    (((BN_ULONG)0) << BN_BITS2)

...does equal 0! This means that, on my system at least, size_limit will be
off by 1 when bits == BN_BITS2.

This commit fixes the behaviour so that we always get consistent results.

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

The function CRYPTO_128_unwrap_pad uses an 8 byte AIV (Alternative Initial
Value). The least significant 4 bytes of this is placed into the local
variable |ptext_len|. This is done as follows:

    ptext_len = (aiv[4] << 24) | (aiv[5] << 16) | (aiv[6] << 8) | aiv[7];

aiv[4] is an unsigned char, but (aiv[4] << 24) is promoted to a *signed*
int - therefore we could end up shifting into the sign bit and end up with
a negative value. |ptext_len| is a size_t (typically 64-bits). If the
result of the shifts is negative then the upper bits of |ptext_len| will
all be 1.

This commit fixes the issue by explicitly casting to an unsigned int.

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

Passing a negative value for the "-time" option to s_time results in a seg
fault. This commit fixes it so that time has to be greater than 0.

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

The function tls1_PRF counts the number of digests in use and partitions
security evenly between them. There always needs to be at least one digest
in use, otherwise this is an internal error. Add a sanity check for this.

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

The function sk_zero is supposed to zero the elements held within a stack.
It uses memset to do this. However it calculates the size of each element
as being sizeof(char **) instead of sizeof(char *). This probably doesn't
make much practical difference in most cases, but isn't a portable
assumption.

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

Move memory allocation failure checks closer to the site of the malloc in
dgst app. Only a problem if the debug flag is set...but still should be
fixed.

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

Add some missing checks for memory allocation failures in ca app.

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

TABLE was always a debugging tool, and permitted everyone to see the
effect of changes in the string-format configs.  The hash-format
configs being much more readable, distributing TABLE becomes much less
necessary.

Being able to produce a TABLE is kept, however, as it still is a
useful debugging tool for configs, what with multi-level inheritance
and all.

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

Move obviously personal configurations to personal files.

Note: those files should really not be in the main repo at all

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

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

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

As part of this, remove some levitte examples that never were relevant.

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

Because base templates express inheritance of values, the attribute is
renamed to 'inherit_from', and texts about this talk about 'inheritance(s)'
rather than base templates.

As they were previously implemented, base templates that were listed
together would override one another, the first one acting as defaults for
the next and so on.

However, it was pointed out that a strength of inheritance would be to
base configurations on several templates - for example one for CPU, one
for operating system and one for compiler - and that requires a different
way of combining those templates.  With this change, inherited values
from several inheritances are concatenated by default (keep on reading).

Also, in-string templates with the double-curly syntax are removed,
replaced with the possibility to have a configuration value be a coderef
(i.e. a 'sub { /* your code goes here */ }') that gets the list of values
from all inheritances as the list @_.  The result of executing such a
coderef on a list of values is assumed to become a string.  ANY OTHER
FORM OF VALUE WILL CURRENTLY BREAK.

As a matter of fact, an attribute in the current config with no value is
assumed to have this coderef as value:

    sub { join(' ', @_) }

While we're at it, rename debug-[cl]flags to debug_[cl]flags and
nodebug-[cl]flags to release_[cl]flags.

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

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

Base templates are templates that are used to inherit from.  They can
loosely be compared with parent class inheritance in object orientation.
They can be used for the same purpose as the variables with multi-field
strings are used in old-style string configurations.

Base templates are declared with the base_templates configuration
attribute, like so:

	"example_target" => {
		base_templates => [ "x86_asm", ... ]
		...
	}

Note: The value of base_templates MUST be an array reference (an array
enclosed in square brackets).

Any configuration target can be used as a base template by another.  It
is also possible to have a target that's a pure template and not meant to
be used directly as a configuration target.  Such a target is marked with
the template configuration attribute, like so:

	"example_template" => {
		template => 1,
		cc => "mycc",
		...
	},

As part of this commit, all variables with multi-field strings have been
translated to pure templates.  The variables currently remain since we
can't expect people to shift to hash table configurations immediately.

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

Template references are words with double brackets, and refer to the
same field in the target pointed at the the double bracketed word.

For example, if a target's configuration has the following entry:

    'cflags' => '-DFOO {{x86_debug}}'

... then {{x86_debug}} will be replaced with the 'cflags' value from
target 'x86_debug'.

Note: template references are resolved recursively, and circular
references are not allowed

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

The reasoning is that configuration strings are hard to read and error
prone, and that a better way would be for them to be key => value hashes.

Configure is made to be able to handle target configuration values as a
string as well as a hash.  It also does the best it can to combine a
"debug-foo" target with a "foo" target, given that they are similar
except for the cflags and lflags values.  The latter are spliced into
options that are common for "debug-foo" and "foo", options that exist
only with "debug-foo" and options that exist only with "foo", and make
them into combinable attributes that holds common cflags, extra cflags
for debuggin and extra cflags for non-debugging configurations.

The next step is to make it possible to have template configurations.

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

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

Previously, ASN1_UTCTIME_cmp_time_t would return 1 if s > t, -1 if
s < t, and 0 if s == t.

This behavior was broken in a refactor [0], resulting in the opposite
time comparison behavior.

[0]: 904348a4922333106b613754136305db229475ea

PR#3706

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

Missed one file in the #ifdef merge; thanks Kurt.

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

Update error messages to say "EC is disabled" these can then be picked up
by mkdef.pl.

Update ordinals.

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

It created the cert structure in SSL_CTX or SSL if it was NULL, but they can
never be NULL as the comments already said.

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

Other curves don't have this problem.

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Emilia Käsper <emilia@openssl.org>

Td4 and Te4 are arrays of u8. A u8 << int promotes the u8 to an int first then shifts.
If the mathematical result of a shift (as modelled by lhs * 2^{rhs}) is not representable
in an integer, behaviour is undefined. In other words, you can't shift into the sign bit
of a signed integer. Fix this by casting to u32 whenever we're shifting left by 24.

(For consistency, cast other shifts, too.)

Caught by -fsanitize=shift

Submitted by Nick Lewycky (Google)

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

Allocate and free ASN.1 string types directly instead of going through
the ASN.1 item code.

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

According to RFC 5649 section 4.1 step 1) we should not add padding
if plaintext length is multiply of 8 ockets.

This matches pseudo-code in http://dx.doi.org/10.6028/NIST.SP.800-38F


on page 15, section 6.3 KWP, algorithm 5 KWP-AE, step 2.

PR#3675

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

Remove DECLARE_ASN1_SET_OF and DECLARE_PKCS12_STACK_OF these haven't been
used internally in OpenSSL for some time.

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

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