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ChangeLog
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Mbed TLS ChangeLog (Sorted per branch, date)
= Mbed TLS 2.28.2 branch released 2022-12-14
Security
* Fix potential heap buffer overread and overwrite in DTLS if
MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and
MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX.
* An adversary with access to precise enough information about memory
accesses (typically, an untrusted operating system attacking a secure
enclave) could recover an RSA private key after observing the victim
performing a single private-key operation if the window size used for the
exponentiation was 3 or smaller. Found and reported by Zili KOU,
Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks
and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation
and Test in Europe 2023.
Bugfix
* Fix a long-standing build failure when building x86 PIC code with old
gcc (4.x). The code will be slower, but will compile. We do however
recommend upgrading to a more recent compiler instead. Fixes #1910.
* Fix support for little-endian Microblaze when MBEDTLS_HAVE_ASM is defined.
Contributed by Kazuyuki Kimura to fix #2020.
* Use double quotes to include private header file psa_crypto_cipher.h.
Fixes 'file not found with <angled> include' error
when building with Xcode.
* Fix handling of broken symlinks when loading certificates using
mbedtls_x509_crt_parse_path(). Instead of returning an error as soon as a
broken link is encountered, skip the broken link and continue parsing
other certificate files. Contributed by Eduardo Silva in #2602.
* Fix a compilation error when using CMake with an IAR toolchain.
Fixes #5964.
* Fix bugs and missing dependencies when building and testing
configurations with only one encryption type enabled in TLS 1.2.
* Provide the missing definition of mbedtls_setbuf() in some configurations
with MBEDTLS_PLATFORM_C disabled. Fixes #6118, #6196.
* Fix compilation errors when trying to build with
PSA drivers for AEAD (GCM, CCM, Chacha20-Poly1305).
* Fix memory leak in ssl_parse_certificate_request() caused by
mbedtls_x509_get_name() not freeing allocated objects in case of error.
Change mbedtls_x509_get_name() to clean up allocated objects on error.
* Fix checks on PK in check_config.h for builds with PSA and RSA. This does
not change which builds actually work, only moving a link-time error to
an early check.
* Fix ECDSA verification, where it was not always validating the
public key. This bug meant that it was possible to verify a
signature with an invalid public key, in some cases. Reported by
Guido Vranken using Cryptofuzz in #4420.
* Fix a possible null pointer dereference if a memory allocation fails
in TLS PRF code. Reported by Michael Madsen in #6516.
* Fix a bug in which mbedtls_x509_crt_info() would produce non-printable
bytes when parsing certificates containing a binary RFC 4108
HardwareModuleName as a Subject Alternative Name extension. Hardware
serial numbers are now rendered in hex format. Fixes #6262.
* Fix bug in error reporting in dh_genprime.c where upon failure,
the error code returned by mbedtls_mpi_write_file() is overwritten
and therefore not printed.
* In the bignum module, operations of the form (-A) - (+A) or (-A) - (-A)
with A > 0 created an unintended representation of the value 0 which was
not processed correctly by some bignum operations. Fix this. This had no
consequence on cryptography code, but might affect applications that call
bignum directly and use negative numbers.
* Fix undefined behavior (typically harmless in practice) of
mbedtls_mpi_add_mpi(), mbedtls_mpi_add_abs() and mbedtls_mpi_add_int()
when both operands are 0 and the left operand is represented with 0 limbs.
* Fix undefined behavior (typically harmless in practice) when some bignum
functions receive the most negative value of mbedtls_mpi_sint. Credit
to OSS-Fuzz. Fixes #6597.
* Fix undefined behavior (typically harmless in practice) in PSA ECB
encryption and decryption.
= Mbed TLS 2.28.1 branch released 2022-07-11
Default behavior changes
* mbedtls_cipher_set_iv will now fail with ChaCha20 and ChaCha20+Poly1305
for IV lengths other than 12. The library was silently overwriting this
length with 12, but did not inform the caller about it. Fixes #4301.
Features
* When MBEDTLS_PSA_CRYPTO_CONFIG is enabled, you may list the PSA crypto
feature requirements in the file named by the new macro
MBEDTLS_PSA_CRYPTO_CONFIG_FILE instead of the default psa/crypto_config.h.
Furthermore you may name an additional file to include after the main
file with the macro MBEDTLS_PSA_CRYPTO_USER_CONFIG_FILE.
Security
* Zeroize dynamically-allocated buffers used by the PSA Crypto key storage
module before freeing them. These buffers contain secret key material, and
could thus potentially leak the key through freed heap.
* Fix a potential heap buffer overread in TLS 1.2 server-side when
MBEDTLS_USE_PSA_CRYPTO is enabled, an opaque key (created with
mbedtls_pk_setup_opaque()) is provisioned, and a static ECDH ciphersuite
is selected. This may result in an application crash or potentially an
information leak.
* Fix a buffer overread in DTLS ClientHello parsing in servers with
MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled. An unauthenticated client
or a man-in-the-middle could cause a DTLS server to read up to 255 bytes
after the end of the SSL input buffer. The buffer overread only happens
when MBEDTLS_SSL_IN_CONTENT_LEN is less than a threshold that depends on
the exact configuration: 258 bytes if using mbedtls_ssl_cookie_check(),
and possibly up to 571 bytes with a custom cookie check function.
Reported by the Cybeats PSI Team.
Bugfix
* Fix a memory leak if mbedtls_ssl_config_defaults() is called twice.
* Fix several bugs (warnings, compiler and linker errors, test failures)
in reduced configurations when MBEDTLS_USE_PSA_CRYPTO is enabled.
* Fix a bug in (D)TLS curve negotiation: when MBEDTLS_USE_PSA_CRYPTO was
enabled and an ECDHE-ECDSA or ECDHE-RSA key exchange was used, the
client would fail to check that the curve selected by the server for
ECDHE was indeed one that was offered. As a result, the client would
accept any curve that it supported, even if that curve was not allowed
according to its configuration. Fixes #5291.
* Fix unit tests that used 0 as the file UID. This failed on some
implementations of PSA ITS. Fixes #3838.
* Fix API violation in mbedtls_md_process() test by adding a call to
mbedtls_md_starts(). Fixes #2227.
* Fix compile errors when MBEDTLS_HAVE_TIME is not defined. Add tests
to catch bad uses of time.h.
* Fix the library search path when building a shared library with CMake
on Windows.
* Fix bug in the alert sending function mbedtls_ssl_send_alert_message()
potentially leading to corrupted alert messages being sent in case
the function needs to be re-called after initially returning
MBEDTLS_SSL_WANT_WRITE. Fixes #1916.
* In configurations with MBEDTLS_SSL_DTLS_CONNECTION_ID enabled but none of
MBEDTLS_SSL_HW_RECORD_ACCEL, MBEDTLS_SSL_EXPORT_KEYS or MBEDTLS_DEBUG_C,
DTLS handshakes using CID would crash due to a null pointer dereference.
Fix this. Fixes #3998.
* Fix incorrect documentation of mbedtls_x509_crt_profile. The previous
documentation stated that the `allowed_pks` field applies to signatures
only, but in fact it does apply to the public key type of the end entity
certificate, too. Fixes #1992.
* Fix PSA cipher multipart operations using ARC4. Previously, an IV was
required but discarded. Now, an IV is rejected, as it should be.
* Fix undefined behavior in mbedtls_asn1_find_named_data(), where val is
not NULL and val_len is zero.
* psa_raw_key_agreement() now returns PSA_ERROR_BUFFER_TOO_SMALL when
applicable. Fixes #5735.
* Fix a bug in the x25519 example program where the removal of
MBEDTLS_ECDH_LEGACY_CONTEXT caused the program not to run. Fixes #4901 and
#3191.
* Encode X.509 dates before 1/1/2000 as UTCTime rather than
GeneralizedTime. Fixes #5465.
* Fix order value of curve x448.
* Fix string representation of DNs when outputting values containing commas
and other special characters, conforming to RFC 1779. Fixes #769.
* Silence a warning from GCC 12 in the selftest program. Fixes #5974.
* Fix mbedtls_asn1_write_mpi() writing an incorrect encoding of 0.
* Fix resource leaks in mbedtls_pk_parse_public_key() in low
memory conditions.
* Fix server connection identifier setting for outgoing encrypted records
on DTLS 1.2 session resumption. After DTLS 1.2 session resumption with
connection identifier, the Mbed TLS client now properly sends the server
connection identifier in encrypted record headers. Fix #5872.
* Fix a null pointer dereference when performing some operations on zero
represented with 0 limbs (specifically mbedtls_mpi_mod_int() dividing
by 2, and mbedtls_mpi_write_string() in base 2).
* Fix record sizes larger than 16384 being sometimes accepted despite being
non-compliant. This could not lead to a buffer overflow. In particular,
application data size was already checked correctly.
Changes
* Assume source files are in UTF-8 when using MSVC with CMake.
= mbed TLS 2.28.0 branch released 2021-12-17
API changes
* Some fields of mbedtls_ssl_session and mbedtls_ssl_config are in a
different order. This only affects applications that define such
structures directly or serialize them.
Requirement changes
* Sign-magnitude and one's complement representations for signed integers are
not supported. Two's complement is the only supported representation.
Removals
* Remove config option MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES,
which allowed SHA-1 in the default TLS configuration for certificate
signing. It was intended to facilitate the transition in environments
with SHA-1 certificates. SHA-1 is considered a weak message digest and
its use constitutes a security risk.
* Remove the partial support for running unit tests via Greentea on Mbed OS,
which had been unmaintained since 2018.
Features
* The identifier of the CID TLS extension can be configured by defining
MBEDTLS_TLS_EXT_CID at compile time.
* Warn if errors from certain functions are ignored. This is currently
supported on GCC-like compilers and on MSVC and can be configured through
the macro MBEDTLS_CHECK_RETURN. The warnings are always enabled
(where supported) for critical functions where ignoring the return
value is almost always a bug. Enable the new configuration option
MBEDTLS_CHECK_RETURN_WARNING to get warnings for other functions. This
is currently implemented in the AES, DES and md modules, and will be
extended to other modules in the future.
* Add missing PSA macros declared by PSA Crypto API 1.0.0:
PSA_ALG_IS_SIGN_HASH, PSA_ALG_NONE, PSA_HASH_BLOCK_LENGTH, PSA_KEY_ID_NULL.
* Add new API mbedtls_ct_memcmp for constant time buffer comparison.
* Add PSA API definition for ARIA.
Security
* Zeroize several intermediate variables used to calculate the expected
value when verifying a MAC or AEAD tag. This hardens the library in
case the value leaks through a memory disclosure vulnerability. For
example, a memory disclosure vulnerability could have allowed a
man-in-the-middle to inject fake ciphertext into a DTLS connection.
* In psa_cipher_generate_iv() and psa_cipher_encrypt(), do not read back
from the output buffer. This fixes a potential policy bypass or decryption
oracle vulnerability if the output buffer is in memory that is shared with
an untrusted application.
* Fix a double-free that happened after mbedtls_ssl_set_session() or
mbedtls_ssl_get_session() failed with MBEDTLS_ERR_SSL_ALLOC_FAILED
(out of memory). After that, calling mbedtls_ssl_session_free()
and mbedtls_ssl_free() would cause an internal session buffer to
be free()'d twice.
Bugfix
* Stop using reserved identifiers as local variables. Fixes #4630.
* The GNU makefiles invoke python3 in preference to python except on Windows.
The check was accidentally not performed when cross-compiling for Windows
on Linux. Fix this. Fixes #4774.
* Prevent divide by zero if either of PSA_CIPHER_ENCRYPT_OUTPUT_SIZE() or
PSA_CIPHER_UPDATE_OUTPUT_SIZE() were called using an asymmetric key type.
* Fix a parameter set but unused in psa_crypto_cipher.c. Fixes #4935.
* Don't use the obsolete header path sys/fcntl.h in unit tests.
These header files cause compilation errors in musl.
Fixes #4969.
* Fix missing constraints on x86_64 and aarch64 assembly code
for bignum multiplication that broke some bignum operations with
(at least) Clang 12.
Fixes #4116, #4786, #4917, #4962.
* Fix mbedtls_cipher_crypt: AES-ECB when MBEDTLS_USE_PSA_CRYPTO is enabled.
* Failures of alternative implementations of AES or DES single-block
functions enabled with MBEDTLS_AES_ENCRYPT_ALT, MBEDTLS_AES_DECRYPT_ALT,
MBEDTLS_DES_CRYPT_ECB_ALT or MBEDTLS_DES3_CRYPT_ECB_ALT were ignored.
This does not concern the implementation provided with Mbed TLS,
where this function cannot fail, or full-module replacements with
MBEDTLS_AES_ALT or MBEDTLS_DES_ALT. Reported by Armelle Duboc in #1092.
* Some failures of HMAC operations were ignored. These failures could only
happen with an alternative implementation of the underlying hash module.
* Fix the error returned by psa_generate_key() for a public key. Fixes #4551.
* Fix the build of sample programs when neither MBEDTLS_ERROR_C nor
MBEDTLS_ERROR_STRERROR_DUMMY is enabled.
* Fix PSA_ALG_RSA_PSS verification accepting an arbitrary salt length.
This algorithm now accepts only the same salt length for verification
that it produces when signing, as documented. Use the new algorithm
PSA_ALG_RSA_PSS_ANY_SALT to accept any salt length. Fixes #4946.
* The existing predicate macro name PSA_ALG_IS_HASH_AND_SIGN is now reserved
for algorithm values that fully encode the hashing step, as per the PSA
Crypto API specification. This excludes PSA_ALG_RSA_PKCS1V15_SIGN_RAW and
PSA_ALG_ECDSA_ANY. The new predicate macro PSA_ALG_IS_SIGN_HASH covers
all algorithms that can be used with psa_{sign,verify}_hash(), including
these two.
* Fix issue in Makefile on Linux with SHARED=1, that caused shared libraries
not to list other shared libraries they need.
* Fix a bug in mbedtls_gcm_starts() when the bit length of the iv
exceeds 2^32. Fixes #4884.
* Fix an uninitialized variable warning in test_suite_ssl.function with GCC
version 11.
* Fix the build when no SHA2 module is included. Fixes #4930.
* Fix the build when only the bignum module is included. Fixes #4929.
* Fix a potential invalid pointer dereference and infinite loop bugs in
pkcs12 functions when the password is empty. Fix the documentation to
better describe the inputs to these functions and their possible values.
Fixes #5136.
* The key usage flags PSA_KEY_USAGE_SIGN_MESSAGE now allows the MAC
operations psa_mac_compute() and psa_mac_sign_setup().
* The key usage flags PSA_KEY_USAGE_VERIFY_MESSAGE now allows the MAC
operations psa_mac_verify() and psa_mac_verify_setup().
Changes
* Set config option MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE to be
disabled by default.
* Improve the performance of base64 constant-flow code. The result is still
slower than the original non-constant-flow implementation, but much faster
than the previous constant-flow implementation. Fixes #4814.
* Indicate in the error returned if the nonce length used with
ChaCha20-Poly1305 is invalid, and not just unsupported.
* The mbedcrypto library includes a new source code module constant_time.c,
containing various functions meant to resist timing side channel attacks.
This module does not have a separate configuration option, and functions
from this module will be included in the build as required. Currently
most of the interface of this module is private and may change at any
time.
= mbed TLS 2.27.0 branch released 2021-07-07
API changes
* Update AEAD output size macros to bring them in line with the PSA Crypto
API version 1.0 spec. This version of the spec parameterizes them on the
key type used, as well as the key bit-size in the case of
PSA_AEAD_TAG_LENGTH.
The old versions of these macros were renamed and deprecated as follows:
- PSA_AEAD_TAG_LENGTH -> PSA_AEAD_TAG_LENGTH_1_ARG
- PSA_AEAD_ENCRYPT_OUTPUT_SIZE -> PSA_AEAD_ENCRYPT_OUTPUT_SIZE_2_ARG
- PSA_AEAD_DECRYPT_OUTPUT_SIZE -> PSA_AEAD_DECRYPT_OUTPUT_SIZE_2_ARG
- PSA_AEAD_UPDATE_OUTPUT_SIZE -> PSA_AEAD_UPDATE_OUTPUT_SIZE_2_ARG
- PSA_AEAD_FINISH_OUTPUT_SIZE -> PSA_AEAD_FINISH_OUTPUT_SIZE_1_ARG
- PSA_AEAD_VERIFY_OUTPUT_SIZE -> PSA_AEAD_VERIFY_OUTPUT_SIZE_1_ARG
* Implement one-shot cipher functions, psa_cipher_encrypt and
psa_cipher_decrypt, according to the PSA Crypto API 1.0.0
specification.
Requirement changes
* The library now uses the %zu format specifier with the printf() family of
functions, so requires a toolchain that supports it. This change does not
affect the maintained LTS branches, so when contributing changes please
bear this in mind and do not add them to backported code.
Features
* Add mbedtls_rsa_rsassa_pss_sign_ext() function allowing to generate a
signature with a specific salt length. This function allows to validate
test cases provided in the NIST's CAVP test suite. Contributed by Cédric
Meuter in PR #3183.
* Added support for built-in driver keys through the PSA opaque crypto
driver interface. Refer to the documentation of
MBEDTLS_PSA_CRYPTO_BUILTIN_KEYS for more information.
* Implement psa_sign_message() and psa_verify_message().
* The new function mbedtls_mpi_random() generates a random value in a
given range uniformly.
* Implement psa_mac_compute() and psa_mac_verify() as defined in the
PSA Cryptograpy API 1.0.0 specification.
* MBEDTLS_ECP_MAX_BITS is now determined automatically from the configured
curves and no longer needs to be configured explicitly to save RAM.
Security
* Fix a bias in the generation of finite-field Diffie-Hellman-Merkle (DHM)
private keys and of blinding values for DHM and elliptic curves (ECP)
computations. Reported by FlorianF89 in #4245.
* Fix a potential side channel vulnerability in ECDSA ephemeral key generation.
An adversary who is capable of very precise timing measurements could
learn partial information about the leading bits of the nonce used for the
signature, allowing the recovery of the private key after observing a
large number of signature operations. This completes a partial fix in
Mbed TLS 2.20.0.
* It was possible to configure MBEDTLS_ECP_MAX_BITS to a value that is
too small, leading to buffer overflows in ECC operations. Fail the build
in such a case.
* An adversary with access to precise enough information about memory
accesses (typically, an untrusted operating system attacking a secure
enclave) could recover an RSA private key after observing the victim
performing a single private-key operation. Found and reported by
Zili KOU, Wenjian HE, Sharad Sinha, and Wei ZHANG.
* An adversary with access to precise enough timing information (typically, a
co-located process) could recover a Curve25519 or Curve448 static ECDH key
after inputting a chosen public key and observing the victim performing the
corresponding private-key operation. Found and reported by Leila Batina,
Lukas Chmielewski, Björn Haase, Niels Samwel and Peter Schwabe.
Bugfix
* Add printf function attributes to mbedtls_debug_print_msg to ensure we
get printf format specifier warnings.
* Fix premature fopen() call in mbedtls_entropy_write_seed_file which may
lead to seed file corruption in the case where the path to the seed file is
equal to MBEDTLS_PLATFORM_STD_NV_SEED_FILE. Contributed by Victor
Krasnoshchok in #3616.
* PSA functions other than psa_open_key now return PSA_ERROR_INVALID_HANDLE
rather than PSA_ERROR_DOES_NOT_EXIST for an invalid handle, bringing them
in line with version 1.0.0 of the specification. Fix #4162.
* PSA functions creating a key now return PSA_ERROR_INVALID_ARGUMENT rather
than PSA_ERROR_INVALID_HANDLE when the identifier specified for the key
to create is not valid, bringing them in line with version 1.0.0 of the
specification. Fix #4271.
* Fix some cases in the bignum module where the library constructed an
unintended representation of the value 0 which was not processed
correctly by some bignum operations. This could happen when
mbedtls_mpi_read_string() was called on "-0", or when
mbedtls_mpi_mul_mpi() and mbedtls_mpi_mul_int() was called with one of
the arguments being negative and the other being 0. Fixes #4643.
* Fix a bug in ECDSA that would cause it to fail when the hash is all-bits
zero. Fixes #1792
* Fix a compilation error when MBEDTLS_ECP_RANDOMIZE_MXZ_ALT is
defined. Fixes #4217.
* Fix an incorrect error code when parsing a PKCS#8 private key.
* In a TLS client, enforce the Diffie-Hellman minimum parameter size
set with mbedtls_ssl_conf_dhm_min_bitlen() precisely. Before, the
minimum size was rounded down to the nearest multiple of 8.
* In library/net_sockets.c, _POSIX_C_SOURCE and _XOPEN_SOURCE are
defined to specific values. If the code is used in a context
where these are already defined, this can result in a compilation
error. Instead, assume that if they are defined, the values will
be adequate to build Mbed TLS.
* The cipher suite TLS-RSA-WITH-CAMELLIA-256-GCM-SHA384 was not available
when SHA-1 was disabled and was offered when SHA-1 was enabled but SHA-384
was disabled. Fix the dependency. Fixes #4472.
* Do not offer SHA384 cipher suites when SHA-384 is disabled. Fixes #4499.
* With MBEDTLS_PSA_CRYPTO_C disabled, some functions were getting built
nonetheless, resulting in undefined reference errors when building a
shared library. Reported by Guillermo Garcia M. in #4411.
* Fix test suite code on platforms where int32_t is not int, such as
Arm Cortex-M. Fixes #4530.
* Fix some issues affecting MBEDTLS_ARIA_ALT implementations: a misplaced
directive in a header and a missing initialization in the self-test.
* Fix a missing initialization in the Camellia self-test, affecting
MBEDTLS_CAMELLIA_ALT implementations.
* Restore the ability to configure PSA via Mbed TLS options to support RSA
key pair operations but exclude RSA key generation. When MBEDTLS_GENPRIME
is not defined PSA will no longer attempt to use mbedtls_rsa_gen_key().
Fixes #4512.
* Fix a regression introduced in 2.24.0 which broke (D)TLS CBC ciphersuites
(when the encrypt-then-MAC extension is not in use) with some ALT
implementations of the underlying hash (SHA-1, SHA-256, SHA-384), causing
the affected side to wrongly reject valid messages. Fixes #4118.
* Remove outdated check-config.h check that prevented implementing the
timing module on Mbed OS. Fixes #4633.
* Fix PSA_ALG_TLS12_PRF and PSA_ALG_TLS12_PSK_TO_MS being too permissive
about missing inputs.
* Fix mbedtls_net_poll() and mbedtls_net_recv_timeout() often failing with
MBEDTLS_ERR_NET_POLL_FAILED on Windows. Fixes #4465.
* Fix a resource leak in a test suite with an alternative AES
implementation. Fixes #4176.
* Fix a crash in mbedtls_mpi_debug_mpi on a bignum having 0 limbs. This
could notably be triggered by setting the TLS debug level to 3 or above
and using a Montgomery curve for the key exchange. Reported by lhuang04
in #4578. Fixes #4608.
* psa_verify_hash() was relying on implementation-specific behavior of
mbedtls_rsa_rsassa_pss_verify() and was causing failures in some _ALT
implementations. This reliance is now removed. Fixes #3990.
* Disallow inputs of length different from the corresponding hash when
signing or verifying with PSA_ALG_RSA_PSS (The PSA Crypto API mandates
that PSA_ALG_RSA_PSS uses the same hash throughout the algorithm.)
* Fix a null pointer dereference when mbedtls_mpi_exp_mod() was called with
A=0 represented with 0 limbs. Up to and including Mbed TLS 2.26, this bug
could not be triggered by code that constructed A with one of the
mbedtls_mpi_read_xxx functions (including in particular TLS code) since
those always built an mpi object with at least one limb.
Credit to OSS-Fuzz. Fixes #4641.
* Fix mbedtls_mpi_gcd(G,A,B) when the value of B is zero. This had no
effect on Mbed TLS's internal use of mbedtls_mpi_gcd(), but may affect
applications that call mbedtls_mpi_gcd() directly. Fixes #4642.
* The PSA API no longer allows the creation or destruction of keys with a
read-only lifetime. The persistence level PSA_KEY_PERSISTENCE_READ_ONLY
can now only be used as intended, for keys that cannot be modified through
normal use of the API.
* When MBEDTLS_PSA_CRYPTO_SPM is enabled, crypto_spe.h was not included
in all the right places. Include it from crypto_platform.h, which is
the natural place. Fixes #4649.
* mbedtls_pk_sign() and mbedtls_pk_verify() and their extended and
restartable variants now always honor the specified hash length if
nonzero. Before, for RSA, hash_len was ignored in favor of the length of
the specified hash algorithm.
* Fix which alert is sent in some cases to conform to the
applicable RFC: on an invalid Finished message value, an
invalid max_fragment_length extension, or an
unsupported extension used by the server.
* Correct (change from 12 to 13 bytes) the value of the macro describing the
maximum nonce length returned by psa_aead_generate_nonce().
Changes
* Add extra printf compiler warning flags to builds.
* Fix memsan build false positive in x509_crt.c with Clang 11
* Fix the setting of the read timeout in the DTLS sample programs.
* Remove the AES sample application programs/aes/aescrypt2 which shows
bad cryptographic practice. Fix #1906.
* Alternative implementations of CMAC may now opt to not support 3DES as a
CMAC block cipher, and still pass the CMAC self test.
* Remove configs/config-psa-crypto.h, which was identical to the default
configuration except for having some extra cryptographic mechanisms
enabled and for unintended differences. This configuration was primarily
intended to demonstrate the PSA API, and lost most of its usefulness when
MBEDTLS_PSA_CRYPTO_C became enabled by default.
* When building the test suites with GNU make, invoke python3 or python, not
python2, which is no longer supported upstream.
* When using session cache based session resumption on the server,
double-check that custom session cache implementations return
sessions which are consistent with the negotiated ciphersuite
and compression method.
* Fix build failure on MinGW toolchain when __USE_MING_ANSI_STDIO is on.
When that flag is on, standard GNU C printf format specifiers
should be used.
* Reduce the default value of MBEDTLS_ECP_WINDOW_SIZE. This reduces RAM usage
during ECC operations at a negligible performance cost.
* mbedtls_mpi_read_binary(), mbedtls_mpi_read_binary_le() and
mbedtls_mpi_read_string() now construct an mbedtls_mpi object with 0 limbs
when their input has length 0. Note that this is an implementation detail
and can change at any time, so this change should be transparent, but it
may result in mbedtls_mpi_write_binary() or mbedtls_mpi_write_string()
now writing an empty string where it previously wrote one or more
zero digits when operating from values constructed with an mpi_read
function and some mpi operations.
* Implicitly add PSA_KEY_USAGE_SIGN_MESSAGE key usage policy flag when
PSA_KEY_USAGE_SIGN_HASH flag is set and PSA_KEY_USAGE_VERIFY_MESSAGE flag
when PSA_KEY_USAGE_VERIFY_HASH flag is set. This usage flag extension
is also applied when loading a key from storage.
= mbed TLS 2.26.0 branch released 2021-03-08
API changes
* Renamed the PSA Crypto API output buffer size macros to bring them in line
with version 1.0.0 of the specification.
* The API glue function mbedtls_ecc_group_of_psa() now takes the curve size
in bits rather than bytes, with an additional flag to indicate if the
size may have been rounded up to a whole number of bytes.
* Renamed the PSA Crypto API AEAD tag length macros to bring them in line
with version 1.0.0 of the specification.
Default behavior changes
* In mbedtls_rsa_context objects, the ver field was formerly documented
as always 0. It is now reserved for internal purposes and may take
different values.
New deprecations
* PSA_KEY_EXPORT_MAX_SIZE, PSA_HASH_SIZE, PSA_MAC_FINAL_SIZE,
PSA_BLOCK_CIPHER_BLOCK_SIZE, PSA_MAX_BLOCK_CIPHER_BLOCK_SIZE and
PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN have been renamed, and the old names
deprecated.
* PSA_ALG_AEAD_WITH_DEFAULT_TAG_LENGTH and PSA_ALG_AEAD_WITH_TAG_LENGTH
have been renamed, and the old names deprecated.
Features
* The PSA crypto subsystem can now use HMAC_DRBG instead of CTR_DRBG.
CTR_DRBG is used by default if it is available, but you can override
this choice by setting MBEDTLS_PSA_HMAC_DRBG_MD_TYPE at compile time.
Fix #3354.
* Automatic fallback to a software implementation of ECP when
MBEDTLS_ECP_xxx_ALT accelerator hooks are in use can now be turned off
through setting the new configuration flag MBEDTLS_ECP_NO_FALLBACK.
* The PSA crypto subsystem can now be configured to use less static RAM by
tweaking the setting for the maximum amount of keys simultaneously in RAM.
MBEDTLS_PSA_KEY_SLOT_COUNT sets the maximum number of volatile keys that
can exist simultaneously. It has a sensible default if not overridden.
* Partial implementation of the PSA crypto driver interface: Mbed TLS can
now use an external random generator instead of the library's own
entropy collection and DRBG code. Enable MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG
and see the documentation of mbedtls_psa_external_get_random() for details.
* Applications using both mbedtls_xxx and psa_xxx functions (for example,
applications using TLS and MBEDTLS_USE_PSA_CRYPTO) can now use the PSA
random generator with mbedtls_xxx functions. See the documentation of
mbedtls_psa_get_random() for details.
* In the PSA API, the policy for a MAC or AEAD algorithm can specify a
minimum MAC or tag length thanks to the new wildcards
PSA_ALG_AT_LEAST_THIS_LENGTH_MAC and
PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG.
Security
* Fix a security reduction in CTR_DRBG when the initial seeding obtained a
nonce from entropy. Applications were affected if they called
mbedtls_ctr_drbg_set_nonce_len(), if they called
mbedtls_ctr_drbg_set_entropy_len() with a size that was 3/2 times the key
length, or when the entropy module uses SHA-256 and CTR_DRBG uses AES-256.
In such cases, a random nonce was necessary to achieve the advertised
security strength, but the code incorrectly used a constant instead of
entropy from the nonce.
Found by John Stroebel in #3819 and fixed in #3973.
* Fix a buffer overflow in mbedtls_mpi_sub_abs() when calculating
|A| - |B| where |B| is larger than |A| and has more limbs (so the
function should return MBEDTLS_ERR_MPI_NEGATIVE_VALUE). Only
applications calling mbedtls_mpi_sub_abs() directly are affected:
all calls inside the library were safe since this function is
only called with |A| >= |B|. Reported by Guido Vranken in #4042.
* Fix an errorneous estimation for an internal buffer in
mbedtls_pk_write_key_pem(). If MBEDTLS_MPI_MAX_SIZE is set to an odd
value the function might fail to write a private RSA keys of the largest
supported size.
Found by Daniel Otte, reported in #4093 and fixed in #4094.
* Fix a stack buffer overflow with mbedtls_net_poll() and
mbedtls_net_recv_timeout() when given a file descriptor that is
beyond FD_SETSIZE. Reported by FigBug in #4169.
* Guard against strong local side channel attack against base64 tables by
making access aceess to them use constant flow code.
Bugfix
* Fix use-after-scope error in programs/ssl/ssl_client2.c and ssl_server2.c
* Fix memory leak that occured when calling psa_close_key() on a
wrapped key with MBEDTLS_PSA_CRYPTO_SE_C defined.
* Fix an incorrect error code if an RSA private operation glitched.
* Fix a memory leak in an error case in psa_generate_derived_key_internal().
* Fix a resource leak in CTR_DRBG and HMAC_DRBG when MBEDTLS_THREADING_C
is enabled, on platforms where initializing a mutex allocates resources.
This was a regression introduced in the previous release. Reported in
#4017, #4045 and #4071.
* Ensure that calling mbedtls_rsa_free() or mbedtls_entropy_free()
twice is safe. This happens for RSA when some Mbed TLS library functions
fail. Such a double-free was not safe when MBEDTLS_THREADING_C was
enabled on platforms where freeing a mutex twice is not safe.
* Fix a resource leak in a bad-arguments case of mbedtls_rsa_gen_key()
when MBEDTLS_THREADING_C is enabled on platforms where initializing
a mutex allocates resources.
* Fixes a bug where, if the library was configured to include support for
both the old SE interface and the new PSA driver interface, external keys were
not loaded from storage. This was fixed by #3996.
* This change makes 'mbedtls_x509write_crt_set_basic_constraints'
consistent with RFC 5280 4.2.1.9 which says: "Conforming CAs MUST
include this extension in all CA certificates that contain public keys
used to validate digital signatures on certificates and MUST mark the
extension as critical in such certificates." Previous to this change,
the extension was always marked as non-critical. This was fixed by
#3698.
Changes
* A new library C file psa_crypto_client.c has been created to contain
the PSA code needed by a PSA crypto client when the PSA crypto
implementation is not included into the library.
* On recent enough versions of FreeBSD and DragonFlyBSD, the entropy module
now uses the getrandom syscall instead of reading from /dev/urandom.
= mbed TLS 2.25.0 branch released 2020-12-11
API changes
* The numerical values of the PSA Crypto API macros have been updated to
conform to version 1.0.0 of the specification.
* PSA_ALG_STREAM_CIPHER replaces PSA_ALG_CHACHA20 and PSA_ALG_ARC4.
The underlying stream cipher is determined by the key type
(PSA_KEY_TYPE_CHACHA20 or PSA_KEY_TYPE_ARC4).
* The functions mbedtls_cipher_auth_encrypt() and
mbedtls_cipher_auth_decrypt() no longer accept NIST_KW contexts,
as they have no way to check if the output buffer is large enough.
Please use mbedtls_cipher_auth_encrypt_ext() and
mbedtls_cipher_auth_decrypt_ext() instead. Credit to OSS-Fuzz and
Cryptofuzz. Fixes #3665.
Requirement changes
* Update the minimum required CMake version to 2.8.12. This silences a
warning on CMake 3.19.0. #3801
New deprecations
* PSA_ALG_CHACHA20 and PSA_ALG_ARC4 have been deprecated.
Use PSA_ALG_STREAM_CIPHER instead.
* The functions mbedtls_cipher_auth_encrypt() and
mbedtls_cipher_auth_decrypt() are deprecated in favour of the new
functions mbedtls_cipher_auth_encrypt_ext() and
mbedtls_cipher_auth_decrypt_ext(). Please note that with AEAD ciphers,
these new functions always append the tag to the ciphertext, and include
the tag in the ciphertext length.
Features
* Partial implementation of the new PSA Crypto accelerator APIs. (Symmetric
ciphers, asymmetric signing/verification and key generation, validate_key
entry point, and export_public_key interface.)
* Add support for ECB to the PSA cipher API.
* In PSA, allow using a key declared with a base key agreement algorithm
in combined key agreement and derivation operations, as long as the key
agreement algorithm in use matches the algorithm the key was declared with.
This is currently non-standard behaviour, but expected to make it into a
future revision of the PSA Crypto standard.
* Add MBEDTLS_TARGET_PREFIX CMake variable, which is prefixed to the mbedtls,
mbedcrypto, mbedx509 and apidoc CMake target names. This can be used by
external CMake projects that include this one to avoid CMake target name
clashes. The default value of this variable is "", so default target names
are unchanged.
* Add support for DTLS-SRTP as defined in RFC 5764. Contributed by Johan
Pascal, improved by Ron Eldor.
* In the PSA API, it is no longer necessary to open persistent keys:
operations now accept the key identifier. The type psa_key_handle_t is now
identical to psa_key_id_t instead of being platform-defined. This bridges
the last major gap to compliance with the PSA Cryptography specification
version 1.0.0. Opening persistent keys is still supported for backward
compatibility, but will be deprecated and later removed in future
releases.
* PSA_AEAD_NONCE_LENGTH, PSA_AEAD_NONCE_MAX_SIZE, PSA_CIPHER_IV_LENGTH and
PSA_CIPHER_IV_MAX_SIZE macros have been added as defined in version
1.0.0 of the PSA Crypto API specification.
Security
* The functions mbedtls_cipher_auth_encrypt() and
mbedtls_cipher_auth_decrypt() would write past the minimum documented
size of the output buffer when used with NIST_KW. As a result, code using
those functions as documented with NIST_KW could have a buffer overwrite
of up to 15 bytes, with consequences ranging up to arbitrary code
execution depending on the location of the output buffer.
* Limit the size of calculations performed by mbedtls_mpi_exp_mod to
MBEDTLS_MPI_MAX_SIZE to prevent a potential denial of service when
generating Diffie-Hellman key pairs. Credit to OSS-Fuzz.
* A failure of the random generator was ignored in mbedtls_mpi_fill_random(),
which is how most uses of randomization in asymmetric cryptography
(including key generation, intermediate value randomization and blinding)
are implemented. This could cause failures or the silent use of non-random
values. A random generator can fail if it needs reseeding and cannot not
obtain entropy, or due to an internal failure (which, for Mbed TLS's own
CTR_DRBG or HMAC_DRBG, can only happen due to a misconfiguration).
* Fix a compliance issue whereby we were not checking the tag on the
algorithm parameters (only the size) when comparing the signature in the
description part of the cert to the real signature. This meant that a
NULL algorithm parameters entry would look identical to an array of REAL
(size zero) to the library and thus the certificate would be considered
valid. However, if the parameters do not match in *any* way then the
certificate should be considered invalid, and indeed OpenSSL marks these
certs as invalid when mbedtls did not.
Many thanks to guidovranken who found this issue via differential fuzzing
and reported it in #3629.
* Zeroising of local buffers and variables which are used for calculations
in mbedtls_pkcs5_pbkdf2_hmac(), mbedtls_internal_sha*_process(),
mbedtls_internal_md*_process() and mbedtls_internal_ripemd160_process()
functions to erase sensitive data from memory. Reported by
Johan Malmgren and Johan Uppman Bruce from Sectra.
Bugfix
* Fix an invalid (but non-zero) return code from mbedtls_pk_parse_subpubkey()
when the input has trailing garbage. Fixes #2512.
* Fix build failure in configurations where MBEDTLS_USE_PSA_CRYPTO is
enabled but ECDSA is disabled. Contributed by jdurkop. Fixes #3294.
* Include the psa_constant_names generated source code in the source tree
instead of generating it at build time. Fixes #3524.
* Fix rsa_prepare_blinding() to retry when the blinding value is not
invertible (mod N), instead of returning MBEDTLS_ERR_RSA_RNG_FAILED. This
addresses a regression but is rare in practice (approx. 1 in 2/sqrt(N)).
Found by Synopsys Coverity, fix contributed by Peter Kolbus (Garmin).
Fixes #3647.
* Use socklen_t on Android and other POSIX-compliant system
* Fix the build when the macro _GNU_SOURCE is defined to a non-empty value.
Fix #3432.
* Consistently return PSA_ERROR_INVALID_ARGUMENT on invalid cipher input
sizes (instead of PSA_ERROR_BAD_STATE in some cases) to make the
psa_cipher_* functions compliant with the PSA Crypto API specification.
* mbedtls_ecp_curve_list() now lists Curve25519 and Curve448 under the names
"x25519" and "x448". These curves support ECDH but not ECDSA. If you need
only the curves that support ECDSA, filter the list with
mbedtls_ecdsa_can_do().
* Fix psa_generate_key() returning an error when asked to generate
an ECC key pair on Curve25519 or secp244k1.
* Fix psa_key_derivation_output_key() to allow the output of a combined key
agreement and subsequent key derivation operation to be used as a key
inside of the PSA Crypto core.
* Fix handling of EOF against 0xff bytes and on platforms with unsigned
chars. Fixes a build failure on platforms where char is unsigned. Fixes
#3794.
* Fix an off-by-one error in the additional data length check for
CCM, which allowed encryption with a non-standard length field.
Fixes #3719.
* Correct the default IV size for mbedtls_cipher_info_t structures using
MBEDTLS_MODE_ECB to 0, since ECB mode ciphers don't use IVs.
* Make arc4random_buf available on NetBSD and OpenBSD when _POSIX_C_SOURCE is
defined. Fix contributed in #3571.
* Fix conditions for including string.h in error.c. Fixes #3866.
* psa_set_key_id() now also sets the lifetime to persistent for keys located
in a secure element.
* Attempting to create a volatile key with a non-zero key identifier now
fails. Previously the key identifier was just ignored when creating a
volatile key.
* Attempting to create or register a key with a key identifier in the vendor
range now fails.
* Fix build failures on GCC 11. Fixes #3782.
* Add missing arguments of debug message in mbedtls_ssl_decrypt_buf.
* Fix a memory leak in mbedtls_mpi_sub_abs() when the result was negative
(an error condition) and the second operand was aliased to the result.
* Fix a case in elliptic curve arithmetic where an out-of-memory condition
could go undetected, resulting in an incorrect result.
* In CTR_DRBG and HMAC_DRBG, don't reset the reseed interval in seed().
Fixes #2927.
* In PEM writing functions, fill the trailing part of the buffer with null
bytes. This guarantees that the corresponding parsing function can read
the buffer back, which was the case for mbedtls_x509write_{crt,csr}_pem
until this property was inadvertently broken in Mbed TLS 2.19.0.
Fixes #3682.
* Fix a build failure that occurred with the MBEDTLS_AES_SETKEY_DEC_ALT
option on. In this configuration key management methods that are required
for MBEDTLS_CIPHER_MODE_XTS were excluded from the build and made it fail.
Fixes #3818. Reported by John Stroebel.
Changes
* Reduce stack usage significantly during sliding window exponentiation.
Reported in #3591 and fix contributed in #3592 by Daniel Otte.
* The PSA persistent storage format is updated to always store the key bits
attribute. No automatic upgrade path is provided. Previously stored keys
must be erased, or manually upgraded based on the key storage format
specification (docs/architecture/mbed-crypto-storage-specification.md).
Fixes #3740.
* Remove the zeroization of a pointer variable in AES rounds. It was valid
but spurious and misleading since it looked like a mistaken attempt to
zeroize the pointed-to buffer. Reported by Antonio de la Piedra, CEA
Leti, France.
= mbed TLS 2.24.0 branch released 2020-09-01
API changes
* In the PSA API, rename the types of elliptic curve and Diffie-Hellman
group families to psa_ecc_family_t and psa_dh_family_t, in line with the
PSA Crypto API specification version 1.0.0.
Rename associated macros as well:
PSA_ECC_CURVE_xxx renamed to PSA_ECC_FAMILY_xxx
PSA_DH_GROUP_xxx renamed to PSA_DH_FAMILY_xxx
PSA_KEY_TYPE_GET_CURVE renamed to to PSA_KEY_TYPE_ECC_GET_FAMILY
PSA_KEY_TYPE_GET_GROUP renamed to PSA_KEY_TYPE_DH_GET_FAMILY
Default behavior changes
* Stop storing persistent information about externally stored keys created
through PSA Crypto with a volatile lifetime. Reported in #3288 and
contributed by Steven Cooreman in #3382.
Features
* The new function mbedtls_ecp_write_key() exports private ECC keys back to
a byte buffer. It is the inverse of the existing mbedtls_ecp_read_key().
* Support building on e2k (Elbrus) architecture: correctly enable
-Wformat-signedness, and fix the code that causes signed-one-bit-field
and sign-compare warnings. Contributed by makise-homura (Igor Molchanov)
<akemi_homura@kurisa.ch>.
Security
* Fix a vulnerability in the verification of X.509 certificates when
matching the expected common name (the cn argument of
mbedtls_x509_crt_verify()) with the actual certificate name: when the
subjecAltName extension is present, the expected name was compared to any
name in that extension regardless of its type. This means that an
attacker could for example impersonate a 4-bytes or 16-byte domain by
getting a certificate for the corresponding IPv4 or IPv6 (this would
require the attacker to control that IP address, though). Similar attacks
using other subjectAltName name types might be possible. Found and
reported by kFYatek in #3498.
* When checking X.509 CRLs, a certificate was only considered as revoked if
its revocationDate was in the past according to the local clock if
available. In particular, on builds without MBEDTLS_HAVE_TIME_DATE,
certificates were never considered as revoked. On builds with
MBEDTLS_HAVE_TIME_DATE, an attacker able to control the local clock (for
example, an untrusted OS attacking a secure enclave) could prevent
revocation of certificates via CRLs. Fixed by no longer checking the
revocationDate field, in accordance with RFC 5280. Reported by
yuemonangong in #3340. Reported independently and fixed by
Raoul Strackx and Jethro Beekman in #3433.
* In (D)TLS record decryption, when using a CBC ciphersuites without the
Encrypt-then-Mac extension, use constant code flow memory access patterns
to extract and check the MAC. This is an improvement to the existing
countermeasure against Lucky 13 attacks. The previous countermeasure was
effective against network-based attackers, but less so against local
attackers. The new countermeasure defends against local attackers, even
if they have access to fine-grained measurements. In particular, this
fixes a local Lucky 13 cache attack found and reported by Tuba Yavuz,
Farhaan Fowze, Ken (Yihan) Bai, Grant Hernandez, and Kevin Butler
(University of Florida) and Dave Tian (Purdue University).
* Fix side channel in RSA private key operations and static (finite-field)
Diffie-Hellman. An adversary with precise enough timing and memory access
information (typically an untrusted operating system attacking a secure
enclave) could bypass an existing counter-measure (base blinding) and
potentially fully recover the private key.
* Fix a 1-byte buffer overread in mbedtls_x509_crl_parse_der().
Credit to OSS-Fuzz for detecting the problem and to Philippe Antoine
for pinpointing the problematic code.
* Zeroising of plaintext buffers in mbedtls_ssl_read() to erase unused
application data from memory. Reported in #689 by
Johan Uppman Bruce of Sectra.
Bugfix
* Library files installed after a CMake build no longer have execute
permission.
* Use local labels in mbedtls_padlock_has_support() to fix an invalid symbol
redefinition if the function is inlined.
Reported in #3451 and fix contributed in #3452 by okhowang.
* Fix the endianness of Curve25519 keys imported/exported through the PSA
APIs. psa_import_key and psa_export_key will now correctly expect/output
Montgomery keys in little-endian as defined by RFC7748. Contributed by
Steven Cooreman in #3425.
* Fix build errors when the only enabled elliptic curves are Montgomery
curves. Raised by signpainter in #941 and by Taiki-San in #1412. This
also fixes missing declarations reported by Steven Cooreman in #1147.
* Fix self-test failure when the only enabled short Weierstrass elliptic
curve is secp192k1. Fixes #2017.
* PSA key import will now correctly import a Curve25519/Curve448 public key
instead of erroring out. Contributed by Steven Cooreman in #3492.
* Use arc4random_buf on NetBSD instead of rand implementation with cyclical
lower bits. Fix contributed in #3540.
* Fix a memory leak in mbedtls_md_setup() when using HMAC under low memory
conditions. Reported and fix suggested by Guido Vranken in #3486.
* Fix bug in redirection of unit test outputs on platforms where stdout is
defined as a macro. First reported in #2311 and fix contributed in #3528.
Changes
* Only pass -Wformat-signedness to versions of GCC that support it. Reported
in #3478 and fix contributed in #3479 by okhowang.
* Reduce the stack consumption of mbedtls_x509write_csr_der() which
previously could lead to stack overflow on constrained devices.
Contributed by Doru Gucea and Simon Leet in #3464.
* Undefine the ASSERT macro before defining it locally, in case it is defined
in a platform header. Contributed by Abdelatif Guettouche in #3557.
* Update copyright notices to use Linux Foundation guidance. As a result,
the copyright of contributors other than Arm is now acknowledged, and the
years of publishing are no longer tracked in the source files. This also
eliminates the need for the lines declaring the files to be part of
MbedTLS. Fixes #3457.
* Add the command line parameter key_pwd to the ssl_client2 and ssl_server2
example applications which allows to provide a password for the key file
specified through the existing key_file argument. This allows the use of
these applications with password-protected key files. Analogously but for
ssl_server2 only, add the command line parameter key_pwd2 which allows to
set a password for the key file provided through the existing key_file2
argument.
= mbed TLS 2.23.0 branch released 2020-07-01
Default behavior changes
* In the experimental PSA secure element interface, change the encoding of
key lifetimes to encode a persistence level and the location. Although C
prototypes do not effectively change, code calling
psa_register_se_driver() must be modified to pass the driver's location
instead of the keys' lifetime. If the library is upgraded on an existing
device, keys created with the old lifetime value will not be readable or
removable through Mbed TLS after the upgrade.
Features
* New functions in the error module return constant strings for
high- and low-level error codes, complementing mbedtls_strerror()
which constructs a string for any error code, including compound
ones, but requires a writable buffer. Contributed by Gaurav Aggarwal
in #3176.
* The new utility programs/ssl/ssl_context_info prints a human-readable
dump of an SSL context saved with mbedtls_ssl_context_save().
* Add support for midipix, a POSIX layer for Microsoft Windows.
* Add new mbedtls_x509_crt_parse_der_with_ext_cb() routine which allows
parsing unsupported certificate extensions via user provided callback.
Contributed by Nicola Di Lieto <nicola.dilieto@gmail.com> in #3243 as
a solution to #3241.
* Pass the "certificate policies" extension to the callback supplied to
mbedtls_x509_crt_parse_der_with_ext_cb() if it contains unsupported
policies (#3419).
* Added support to entropy_poll for the kern.arandom syscall supported on
some BSD systems. Contributed by Nia Alarie in #3423.
* Add support for Windows 2000 in net_sockets. Contributed by opatomic. #3239
Security
* Fix a side channel vulnerability in modular exponentiation that could
reveal an RSA private key used in a secure enclave. Noticed by Sangho Lee,
Ming-Wei Shih, Prasun Gera, Taesoo Kim and Hyesoon Kim (Georgia Institute
of Technology); and Marcus Peinado (Microsoft Research). Reported by Raoul
Strackx (Fortanix) in #3394.
* Fix side channel in mbedtls_ecp_check_pub_priv() and
mbedtls_pk_parse_key() / mbedtls_pk_parse_keyfile() (when loading a
private key that didn't include the uncompressed public key), as well as
mbedtls_ecp_mul() / mbedtls_ecp_mul_restartable() when called with a NULL
f_rng argument. An attacker with access to precise enough timing and
memory access information (typically an untrusted operating system
attacking a secure enclave) could fully recover the ECC private key.
Found and reported by Alejandro Cabrera Aldaya and Billy Brumley.
* Fix issue in Lucky 13 counter-measure that could make it ineffective when
hardware accelerators were used (using one of the MBEDTLS_SHAxxx_ALT
macros). This would cause the original Lucky 13 attack to be possible in
those configurations, allowing an active network attacker to recover
plaintext after repeated timing measurements under some conditions.
Reported and fix suggested by Luc Perneel in #3246.
Bugfix
* Fix the Visual Studio Release x64 build configuration for mbedtls itself.
Completes a previous fix in Mbed TLS 2.19 that only fixed the build for
the example programs. Reported in #1430 and fix contributed by irwir.
* Fix undefined behavior in X.509 certificate parsing if the
pathLenConstraint basic constraint value is equal to INT_MAX.
The actual effect with almost every compiler is the intended
behavior, so this is unlikely to be exploitable anywhere. #3192
* Fix issue with a detected HW accelerated record error not being exposed
due to shadowed variable. Contributed by Sander Visser in #3310.
* Avoid NULL pointer dereferencing if mbedtls_ssl_free() is called with a
NULL pointer argument. Contributed by Sander Visser in #3312.
* Fix potential linker errors on dual world platforms by inlining
mbedtls_gcc_group_to_psa(). This allows the pk.c module to link separately
from psa_crypto.c. Fixes #3300.
* Remove dead code in X.509 certificate parsing. Contributed by irwir in
#2855.
* Include asn1.h in error.c. Fixes #3328 reported by David Hu.
* Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz()
when PRNG function fails. Contributed by Jonas Lejeune in #3318.
* Remove unused macros from MSVC projects. Reported in #3297 and fix
submitted in #3333 by irwir.
* Add additional bounds checks in ssl_write_client_hello() preventing
output buffer overflow if the configuration declared a buffer that was
too small.
* Set _POSIX_C_SOURCE to at least 200112L in C99 code. Reported in #3420 and
fix submitted in #3421 by Nia Alarie.
* Fix building library/net_sockets.c and the ssl_mail_client program on
NetBSD. Contributed by Nia Alarie in #3422.
* Fix false positive uninitialised variable reported by cpp-check.
Contributed by Sander Visser in #3311.
* Update iv and len context pointers manually when reallocating buffers
using the MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH feature. This caused issues
when receiving a connection with CID, when these fields were shifted
in ssl_parse_record_header().
Changes
* Fix warnings about signedness issues in format strings. The build is now
clean of -Wformat-signedness warnings. Contributed by Kenneth Soerensen
in #3153.
* Fix minor performance issue in operations on Curve25519 caused by using a
suboptimal modular reduction in one place. Found and fix contributed by
Aurelien Jarno in #3209.
* Combine identical cases in switch statements in md.c. Contributed
by irwir in #3208.
* Simplify a bounds check in ssl_write_certificate_request(). Contributed
by irwir in #3150.
* Unify the example programs termination to call mbedtls_exit() instead of
using a return command. This has been done to enable customization of the
behavior in bare metal environments.
* Fix mbedtls_x509_dn_gets to escape non-ASCII characters as "?".
Contributed by Koh M. Nakagawa in #3326.
* Use FindPython3 when cmake version >= 3.15.0
* Abort the ClientHello writing function as soon as some extension doesn't
fit into the record buffer. Previously, such extensions were silently
dropped. As a consequence, the TLS handshake now fails when the output
buffer is not large enough to hold the ClientHello.
* The unit tests now rely on header files in tests/include/test and source
files in tests/src. When building with make or cmake, the files in
tests/src are compiled and the resulting object linked into each test
executable.
* The ECP module, enabled by `MBEDTLS_ECP_C`, now depends on
`MBEDTLS_CTR_DRBG_C` or `MBEDTLS_HMAC_DRBG_C` for some side-channel
coutermeasures. If side channels are not a concern, this dependency can
be avoided by enabling the new option `MBEDTLS_ECP_NO_INTERNAL_RNG`.
* Align MSVC error flag with GCC and Clang. Contributed by Carlos Gomes
Martinho. #3147
* Remove superfluous assignment in mbedtls_ssl_parse_certificate(). Reported
in #3182 and fix submitted by irwir. #3217
* Fix typo in XTS tests. Reported and fix submitted by Kxuan. #3319
= mbed TLS 2.22.0 branch released 2020-04-14