If we pass a pointer to NULL, the memory allocated by OpenSSL has to be
freed with OPENSSL_free(). Otherwise, this can lead to random
crashes/freezes for Windows builds as seen on AppVeyor. To not
complicate things for callers of this macro, we allocate our own memory,
which we already do for other i2d_* calls.
If no valid key is configured (e.g. because it's inadvertently uninitialized),
we should not just reuse the previous key.
The `key_set` flag is not necessary anymore because a non-NULL key is set
during initialization since 6b347d5232 ("openssl: Ensure underlying hash
algorithm is available during HMAC init").
In some cases, the algorithms that have been compiled into a plugin have
to be disabled at runtime. Based on the array returned by the get_features()
function the optionally provided function can strip algorithms or even
callbacks or registrations from a plugin, giving us a handy and powerful way
for runtime feature configuration aside from the plugin list.
Signed-off-by: Thomas Egerer <[email protected]>
Apparently, we should use OPENSSL_free() to release memory allocated by
OpenSSL. While it generally maps to free() that's apparently not the
case on Windows, where the ECP test vectors caused `ACCESS_VIOLATION
exception` crashes (not always the same vector).
Fixes: 74e02ff5e6 ("openssl: Mainly use EVP interface for ECDH")
Functions like ECDH_compute_key() will be removed with OpenSSL 3 (which
will require additional changes as other functions will be deprecated or
removed too).
ECDH_compute_key() was not used because it only gives x-coordinate of
the result. However, the default setting, as per the errata mentioned,
is to use x-coordinate only.
Use ECDH_compute_key() for this setting as it additionally allows HW
offload of the computation using dynamic engine feature in OpenSSL.
EC_POINT_mul() doesn't allow HW offload.
Signed-off-by: Mahantesh Salimath <[email protected]>
In FIPS mode, libgcrypt uses a DRBG, which behaves differently when the
length passed to gcry_create_nonce() or gcry_randomize() is <= 0. It
expects a struct and explicitly checks that the passed pointer is not
NULL.
Commit 27756b081c (revocation: Check that nonce in OCSP response matches)
introduced strict nonce validation to prevent replay attacks with OCSP
responses having a longer lifetime. However, many commercial CAs (such as
Digicert) do not support nonces in responses, as they reuse once-issued OCSP
responses for the OCSP lifetime. This can be problematic for replay attack
scenarios, but is nothing we can fix at our end.
With the mentioned commit, such OCSP responses get completely unusable,
requiring the fallback to CRL based revocation. CRLs don't provide any
replay protection either, so there is nothing gained security-wise, but may
require a download of several megabytes CRL data.
To make use of replay protection where available, but fix OCSP verification
where it is not, do nonce verification only if the response actually contains
a nonce. To be safe against replay attacks, one has to fix the OCSP responder
or use a different CA, but this is not something we can enforce.
Fixes#3557.
The x509 plugin accepted CRL signers since forever, to be precise, since
dffb176f2b ("CRLSign keyUsage or CA basicConstraint are sufficient
for CRL validation")).
References #3529.
The main intention here is that we can change the hashtable_t
implementation without being impeded by the special requirements imposed
by get_match() and sorting the keys/items in buckets.
If cards/libraries don't support signature mechanisms with hashing, we fall
back to do it ourselves in software and pass the PKCS#1 digestInfo ASN.1
structure to sign via CKM_RSA_PKCS mechanism.
Closesstrongswan/strongswan#168.
OpenSSL currently doesn't support squeezing bytes out of an XOF multiple
times. Unfortunately, EVP_DigestFinalXOF() completely resets the context
and later calls not simply fail, they cause a null-pointer dereference in
libcrypto. This fixes the crash at the cost of repeating initializing
the whole state and allocating too much data for subsequent calls.
There is an open issue and PR that might add a function that allows
squeezing more data from an XOF in a future version of OpenSSL.
Doing this for the self-signed check also (i.e. if this and issuer are
the same) is particularly useful if the issuer uses a different key type.
Otherwise, we'd try to verify the signature with an incompatible key
that would result in a log message.
Fixes#3357.
There are a ton of libsoup/GLib-related "leaks" that we can't whitelist
and with leak detective active there is a delay that interestingly doesn't
happen with soup_session_sync_new(), so tests failed with a timeout (actually
they hung due to the lock in the fetcher manager).
On Travis, the curl plugin is used for the tests, so that's not an issue
there (and without LD the tests complete quickly and successfully).
As noted in 8ea13bbc5c newer compilers might optimize out the
assignment leading to invalid values in the keyUsage extension (as the
length was still set, the extension was encoded, just not with the
intended values).
Fixes#3249.
Without this we only would learn that the algorithm isn't actually
available (e.g. due to FIPS mode) when set_key() is called later, so there
isn't any automatic fallback to other implementations.
Fixes#3284.
Andreas Steffen