Commit graph

1559 commits

Author SHA1 Message Date
Manuel Pégourié-Gonnard
508d3a5824
Merge pull request #4664 from tom-daubney-arm/rm_truncated_HMAC_ext
Remove truncated HMAC extension
2021-06-22 11:53:10 +02:00
Hanno Becker
7e6c178b6d Make key export callback and context connection-specific
Fixes #2188

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-06-18 18:40:19 +01:00
Hanno Becker
457d61602f Define and implement new key export API for Mbed TLS 3.0
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-06-18 18:40:19 +01:00
Hanno Becker
2d6e6f8fec Remove '_ext' suffix from SSL key exporter API
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-06-18 18:40:19 +01:00
Hanno Becker
78ba2af7c2 Remove old key export API
Seems to be an oversight that this wasn't marked deprecated.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-06-18 18:40:19 +01:00
Manuel Pégourié-Gonnard
9a32d45819
Merge pull request #4517 from hanno-arm/ticket_api_3_0
Implement 3.0-API for SSL session resumption
2021-06-18 18:34:45 +02:00
Gilles Peskine
39957503c5 Remove secp256k1 from the default X.509 and TLS profiles
For TLS, secp256k1 is deprecated by RFC 8422 §5.1.1. For X.509,
secp256k1 is not deprecated, but it isn't used in practice, especially
in the context of TLS where there isn't much point in having an X.509
certificate which most peers do not support. So remove it from the
default profile. We can add it back later if there is demand.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-17 23:17:52 +02:00
Gilles Peskine
a28f0f5082 Leave the preference order for hashes unspecified
We don't seem to have strong feelings about this, so allow ourselves to
change the order later.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-17 21:46:29 +02:00
Gilles Peskine
b1940a76ad In TLS, order curves by resource usage, not size
TLS used to prefer larger curves, under the idea that a larger curve has a
higher security strength and is therefore harder to attack. However, brute
force attacks are not a practical concern, so this was not particularly
meaningful. If a curve is considered secure enough to be allowed, then we
might as well use it.

So order curves by resource usage. The exact definition of what this means
is purposefully left open. It may include criteria such as performance and
memory usage. Risk of side channels could be a factor as well, although it
didn't affect the current choice.

The current list happens to exactly correspond to the numbers reported by
one run of the benchmark program for "full handshake/s" on my machine.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-17 21:46:29 +02:00
Gilles Peskine
ae270bf386 Upgrade the default TLS hash and curve selection, matching X.509
Upgrade the default list of hashes and curves allowed for TLS. The list is
now aligned with X.509 certificate verification: hashes and curves with at
least 255 bits (Curve25519 included), and RSA 2048 and above.

Remove MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE which would no
longer do anything.

Document more precisely what is allowed by default.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-17 21:46:14 +02:00
Thomas Daubney
32fb900eee Removes truncated HMAC code from ssl_tls.c
Removes conditional code compilation blocks
and code paths relating to the
MBEDTLS_SSL_TRUNCATED_HMAC config option.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
2021-06-16 16:19:53 +01:00
Gilles Peskine
17575dcb03
Merge pull request #4629 from TRodziewicz/rename_functions_whose_deprecated_variants_have_been_removd
Rename the _ret() functions
2021-06-15 20:32:07 +02:00
Manuel Pégourié-Gonnard
8cad2e22fc
Merge pull request #4595 from gilles-peskine-arm/alt-dummy-headers-3.0
Lighten and test constraints on context types in alternative implementations
2021-06-15 12:12:46 +02:00
Gilles Peskine
e5702489f5 mbedtls_dhm_get_value parameter order: context first, output last
mbedtls_dhm_get_value can be seen as either a copy function or a getter
function. Given the name and the semantics, it's more of a getter, even if
it "gets" by doing a copy. Therefore, put the context first, and the
selector next, leaving the output for last.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-15 00:14:28 +02:00
Gilles Peskine
71acc6e8d9 New function mbedtls_dhm_get_value to copy a field of a DHM context
Reduce the need to break the DHM abstraction by accessing the context directly.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-06-15 00:12:37 +02:00
TRodziewicz
3946f79cab Correction according to code review (function and param. names change
and docs rewording)

Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-06-14 13:46:21 +02:00
TRodziewicz
8476f2f30a Turn _SSL_SRV_RESPECT_CLIENT_PREFERENCE config option to a runtime option
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-06-14 11:56:20 +02:00
Gilles Peskine
02b76b7d18
Merge pull request #4619 from TRodziewicz/remove_MBEDTLS_X509_CHECK_x_KEY_USAGE_options
Remove MBEDTLS_X509_CHECK_*_KEY_USAGE options but enable the code
2021-06-10 17:43:36 +02:00
TRodziewicz
26371e4793 Rename the _ret() functions
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-06-08 16:45:41 +02:00
Manuel Pégourié-Gonnard
16fdab79a5
Merge pull request #4382 from hanno-arm/max_record_payload_api
Remove MFL query API and add API for maximum plaintext size of incoming records
2021-06-08 11:07:27 +02:00
TRodziewicz
442fdc22ea Remove MBEDTLS_X509_CHECK_*_KEY_USAGE options but enable the code
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-06-07 13:52:23 +02:00
Hanno Becker
d60b6c62d5 Remove per-version ciphersuite configuration API
This commit removes the API

```
    mbedtls_ssl_conf_ciphersuites_for_version()
```

which allows to configure lists of acceptable ciphersuites
for each supported version of SSL/TLS: SSL3, TLS 1.{0,1,2}.

With Mbed TLS 3.0, support for SSL3, TLS 1.0 and TLS 1.1
is dropped. Moreover, upcoming TLS 1.3 support has a different
notion of cipher suite and will require a different API.

This means that it's only for TLS 1.2 that we require
a ciphersuite configuration API, and

```
   mbedtls_ssl_conf_ciphersuites()
```

can be used for that. The version-specific ciphersuite
configuration API `mbedtls_ssl_conf_ciphersuites_for_version()`,
in turn, is no longer needed.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2021-06-04 12:20:10 +02:00
Ronald Cron
ea62d2f391
Merge pull request #4369 from hanno-arm/relax_psk_config
Implement relaxed semantics for static PSK configuration in Mbed TLS 3.0
2021-05-31 10:03:56 +02:00
TRodziewicz
46cccb8f39 _SSL_DTLS_BADMAC_LIMIT config.h option removed
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-26 13:36:21 +02:00
TRodziewicz
4ca18aae38 Corrections after the code review
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-24 13:38:00 +02:00
TRodziewicz
6370dbeb1d Remove the _SSL_FALLBACK_ parts
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-24 12:49:59 +02:00
TRodziewicz
ef73f01927 Removing strayed dtls1 after doing tests
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-24 12:49:04 +02:00
TRodziewicz
28126050f2 Removal of constants and functions and a new ChangeLog file
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-24 12:48:12 +02:00
TRodziewicz
0f82ec6740 Remove the TLS 1.0 and 1.1 support
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-05-24 12:45:20 +02:00
Hanno Becker
2d8e99b097 Add API to query maximum plaintext size of incoming records
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-05-23 06:03:55 +01:00
Janos Follath
7fc487c4d6
Merge pull request #4347 from hanno-arm/ssl_session_cache_3_0
Add session ID as an explicit parameter to SSL session cache API
2021-05-21 09:28:55 +01:00
Mateusz Starzyk
17011a3185 Merge branch 'development' into convert_NO_SHA384_to_positive
Conflicts:
	library/version_features.c
	programs/test/query_config.c

Files were removed in development branch and modified by current branch.
Conflicts fixes by removing them.
2021-05-20 14:18:12 +02:00
Mateusz Starzyk
c6d94aba50 Fix remaining SHA384 dependencies and ifdef blocks.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-05-19 16:23:47 +02:00
Ronald Cron
0e3ec27598
Merge pull request #4506 from gilles-peskine-arm/array-parameters-to-pointers-sha512
Change sha256 and sha512 output type from an array to a pointer
2021-05-19 12:37:17 +02:00
Mateusz Starzyk
4228f895c0 Merge branch 'development' into convert_NO_SHA384_to_positive
Conflicts:
* configs/config-psa-crypto.h: modified here, removed in development
* tests/suites/test_suite_x509parse.data: all conflicts are in depends_on
  lines where development made a change unrelated to MBEDTLS_SHAxxx and our
  branch either changed `MBEDTLS_SHA256_C` to `MBEDTLS_SHA224_C` or
  `MBEDTLS_SHA512_C:!MBEDTLS_SHA512_NO_SHA384` to ``MBEDTLS_SHA384_C`, with
  no change to what the test does. Pick the other branch's dependency
  changes then apply our SHA dpeendency change.
2021-05-19 11:37:49 +02:00
Ronald Cron
fdcde47f36
Merge pull request #4458 from davidhorstmann-arm/remove-max-content-len
Remove MBEDTLS_SSL_MAX_CONTENT_LEN option
2021-05-17 16:36:04 +02:00
Manuel Pégourié-Gonnard
9370f01391
Merge pull request #3927 from hanno-arm/ciphersuite_helper_macros
Unify naming scheme for macros indicating presence of classes of ciphersuites
2021-05-17 11:18:58 +02:00
Manuel Pégourié-Gonnard
5605911fd3
Merge pull request #4447 from hanno-arm/ssl_config_cleanup
Avoid and remove some SSL error codes for Mbed TLS 3.0
2021-05-17 10:55:17 +02:00
Hanno Becker
fd86ca8626 Rename SOME_MODES_USE_MAC -> SOME_SUITES_USE_MAC
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-05-15 06:07:48 +01:00
Hanno Becker
541af8575e Use -1 instead of 1 as failure return value in internal SSL function
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-05-14 16:49:01 +01:00
Hanno Becker
e810bbc1ac Implement 3.0-semantics for mbedtls_ssl_{get,set}_session()
mbedtls_ssl_{get,set}_session() exhibited idempotent behaviour
in Mbed TLS 2.x. Multiple calls to those functions are not useful
in TLS 1.2, and the idempotent nature is unsuitable for support of
TLS 1.3 which introduces the availabilty to offer multiple tickets
for resumption, as well as receive multiple tickets.

In preparation for TLS 1.3 support, this commit relaxes the semantics
of `mbedtls_ssl_{get,set}_session()` by allowing implementations to
fail gracefully, and leveraging this freedom by modifying the
existing TLS 1.2 implementation to only accept one call to
`mbedtls_ssl_{get,set}_session()` per context, and non-fatally
failing all subsequent invocations.

For TLS 1.3, it will be leveraged by making multiple calls to
`mbedtls_ssl_get_session()` issue one ticket a time until no more
tickets are available, and by using multiple calls to
`mbedtls_ssl_set_session()` to allow the client to offer multiple
tickets to the server.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-05-14 16:27:54 +01:00
Hanno Becker
494dc71de8 Remove mbedtls_ssl_get_session_pointer()
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-05-14 15:15:35 +01:00
Gilles Peskine
3e3a6789d1 Remove a kludge for the output size of mbedtls_sha512_finish_ret
Remove a kludge to avoid a warning in GCC 11 when calling
mbedtls_sha512_finish_ret with a 48-byte output buffer. This is correct
since we're calculating SHA-384. When mbedtls_sha512_finish_ret's output
parameter was declared as a 64-byte array, GCC 11 -Wstringop-overflow
emitted a well-meaning, but inaccurate buffer overflow warning, which we
tried to work around (successfully with beta releases but unsuccessfully
with GCC 11.1.0 as released). Now that the output parameter is declared as a
pointer, no workaround is necessary.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-05-13 00:46:10 +02:00
David Horstmann
95d516f319 Remove MBEDTLS_SSL_MAX_CONTENT_LEN option
Signed-off-by: David Horstmann <david.horstmann@arm.com>
2021-05-10 17:02:48 +01:00
Hanno Becker
9cfe6e977d Assert presence of server certificate in Certificate writer
The server-side `Certificate` handshake message writer checks
whether a certificate is present, and if not fails with:

```
   MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED
```

This should never happen, since the library checks the presence
of a suitable certificate before picking a ciphersuite. It is
therefore more suitable to convert this check into an assertion,
and fail with MBEDTLS_ERR_SSL_INTERNAL_ERROR upon failure.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-30 05:38:24 +01:00
Hanno Becker
6c78046960 Remove uses of MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH
The error code MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH is only
returned from the internal function

```
   mbedtls_ssl_set_calc_verify_md()
```

Moreover, at every call-site of this function, it is only
checked whether the return value is 0 or not, while the
exact return value is irrelevant.

The behavior the library is therefore unchanged if we return 1
instead of MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH in
`mbedtls_ssl_set_calc_verify_md()`. This commit makes this change.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-30 05:37:11 +01:00
Hanno Becker
91e1cc3bd7 Remove MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE error code
This error is used when the output buffer isn't large enough
to hold our own certificate.

In the interest of cleaning up the error space for 3.0, this commit
removes MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE and replaces its single
use by MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-30 05:32:41 +01:00
TRodziewicz
85dfc4de20 Applying current changes
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-04-30 00:07:04 +02:00
TRodziewicz
18efb73743 Remove deprecated functions and constants.
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-04-29 23:12:19 +02:00
Mateusz Starzyk
e3c48b4a88 Separate SHA224 from SHA256 config options.
These options are still dependant on each other.
This is an intermediate step.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-04-28 14:38:37 +02:00
Mateusz Starzyk
3352a53475 Modify config option for SHA384.
Although SHA512 is currently required to enable SHA384, this
is expected to change in the future. This commit is an
intermediate step towards fully separating SHA384 and SHA512.

check_config is the only module which enforces that SHA512 is
enabled together with SHA384.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-04-28 14:38:37 +02:00
Tomasz Rodziewicz
d6c246f5bf
Merge branch 'development_3.0' into remove_depr_error_codes 2021-04-21 12:31:43 +02:00
Hanno Becker
2ed3dced8f Implement new semantics for static PSK configuration
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-21 07:05:34 +01:00
Mateusz Starzyk
c301bd56f0 Merge branch 'development_3.0' into drop_old_tls_options 2021-04-15 13:55:20 +02:00
Hanno Becker
ccdaf6ed22 Add session ID as explicit parameter to SSL session cache API
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-15 10:47:40 +01:00
Hanno Becker
a637ff6ddd Introduce typedef for SSL session cache callbacks
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-04-15 10:47:40 +01:00
TRodziewicz
b579ccd529 The still used deprecated error codes replaced with _PLATFORM_ ones
Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
2021-04-13 14:29:29 +02:00
Dave Rodgman
73e3e2cb1a Merge remote-tracking branch 'origin/development' into development_new
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

Conflicts:
        include/mbedtls/check_config.h: nearby edits
	library/entropy.c: nearby edits
	programs/random/gen_random_havege.c: modification vs. removal
	programs/ssl/ssl_test_lib.h: nearby edits
	programs/test/cpp_dummy_build.cpp: nearby edits
	visualc/VS2010/mbedTLS.vcxproj: automatically generated file,
            regenerated with scripts/generate_visualc_files.pl
2021-04-07 16:31:09 +01:00
Mateusz Starzyk
e204dbf272 Drop support for MBEDTLS_SSL_HW_RECORD_ACCEL.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 12:49:54 +01:00
Mateusz Starzyk
5224e29f0e Drop support for RC4 TLS ciphersuites.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 12:49:54 +01:00
Mateusz Starzyk
a3a9984a5d Drop support for TLS record-level compression.
Remove option MBEDTLS_ZLIB_SUPPORT.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 12:49:51 +01:00
Mateusz Starzyk
2012ed7560 Drop support for compatibility with our own previous buggy implementation of truncated HMAC (MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT).
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 12:19:09 +01:00
Mateusz Starzyk
06b07fb839 Drop support for SSLv3.
Remove options: MBEDTLS_SSL_MINOR_VERSION_0 and
MBEDTLS_SSL_PROTO_SSL3).

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
2021-03-16 12:19:05 +01:00
Paul Elliott
b744990717 Fix missed size_t printf
Code was missed due to rework moving duplicated code into a function

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
2021-03-10 18:17:12 +00:00
Paul Elliott
d48d5c6615 Fix size_t and longlong specifiers for MinGW
MinGW and older windows compilers cannot cope with %zu or %lld (there is
a workaround for MinGW, but it involves linking more code, there is no
workaround for Windows compilers prior to 2013). Attempt to work around
this by defining printf specifiers for size_t per platform for the
compilers that cannot use the C99 specifiers.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
2021-03-10 17:00:32 +00:00
Paul Elliott
3891caf1ce Misc review requested fixes
Style fixes and cast certain defines to size_t

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
2021-03-10 17:00:32 +00:00
Paul Elliott
9f35211774 Fixes for invalid printf format specifiers
Fixes for printf format specifiers, where they have been flagged as
invalid sizes by coverity, and new build flags to enable catching these
errors when building using CMake. Note that this patch uses %zu, which
requires C99 or later.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
2021-03-10 17:00:32 +00:00
Chris Jones
84a773f8e6 Rename ssl_internal.h to ssl_misc.h
Signed-off-by: Chris Jones <christopher.jones@arm.com>
2021-03-10 12:52:37 +00:00
Chris Jones
e2191cd789 Update includes to use library/ instead of include/mbedtls/
Simple find and replace using `#include (<|")mbedtls/(.*)_internal.h(>|")`
and `#include $1$2_internal.h$3`.

Also re-generated visualc files by running
`scripts/generate_visualc_files.pl`.

Signed-off-by: Chris Jones <christopher.jones@arm.com>
2021-03-10 12:52:37 +00:00
Andrzej Kurek
069fa96cd7 Use size_t instead of uint32_t for ssl I/O buffer lengths
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2021-01-11 09:13:58 -05:00
Andrzej Kurek
4a0637981b Refactor the variable I/O buffer size feature
Reduce code duplication to simplify the feature and reduce code size.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2021-01-11 09:12:53 -05:00
Rodrigo Dias Correa
f06a6144e2 Change function casting in ssl_calc_finished_tls_sha384
`finish_sha384_t` was made more generic by using `unsigned char*`
instead of `unsigned char[48]` as the second parameter.
This change tries to make the function casting more robust against
future improvements of gcc analysis.

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
2020-11-25 07:30:26 -03:00
Rodrigo Dias Correa
d596ca8a1e Fix GCC warning in ssl_calc_finished_tls_sha384
This commit fixes the same warning fixed by baeedbf9, but without
wasting RAM. By casting `mbedtls_sha512_finish_ret()`, `padbuf`
could be kept 48 bytes long without triggering any warnings.

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
2020-11-25 01:13:12 -03:00
Rodrigo Dias Correa
eb5d014d8e Fix GCC warning in ssl_calc_finished_tls_sha384
GCC 11 generated a warning because `padbuf` was too small to be
used as an argument for `mbedtls_sha512_finish_ret`. The `output`
parameter of `mbedtls_sha512_finish_ret` has the type
`unsigned char[64]`, but `padbuf` was only 48 bytes long.

Even though `ssl_calc_finished_tls_sha384` uses only 48 bytes for
the hash output, the size of `padbuf` was increased to 64 bytes.

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
2020-11-25 01:13:12 -03:00
Rodrigo Dias Correa
2c424570e2 Fix mismatched function parameters (prototype/definition)
In GCC 11, parameters declared as arrays in function prototypes
cannot be declared as pointers in the function definition. The
same is true for the other way around.

The definition of `mbedtls_aes_cmac_prf_128` was changed to match
its public prototype in `cmac.h`. The type `output` was
`unsigned char *`, now is `unsigned char [16]`.

In `ssl_tls.c`, all the `ssl_calc_verify_*` variants now use pointers
for the output `hash` parameter. The array parameters were removed
because those functions must be compatible with the function pointer
`calc_verify` (defined in `ssl_internal.h`).

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
2020-11-25 01:13:12 -03:00
Rodrigo Dias Correa
2630f6720d Fix build failure on gcc-11
Function prototypes changed to use array parameters instead of
pointers.

Signed-off-by: Rodrigo Dias Correa <rodrigo@correas.us>
2020-11-25 01:13:12 -03:00
Ronald Cron
cf56a0a320 psa: Move from key handle to key identifier
Move all the PSA crypto APIs using key handles
to use key identifiers but psa_key_open() and
psa_key_close(). This is done without modifying
any test as key handles and key identifiers are
now the same.

Update the library modules using PSA crypto APIs
to get rid of key handles.

Programs and unit tests are updated to not use
key handles in subsequent commits, not in this
one.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
2020-11-10 16:00:41 +01:00
Ronald Cron
c26f8d467a Introduce psa_key_handle_is_null inline function
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
2020-11-10 16:00:41 +01:00
Ronald Cron
91e9515424 Introduce PSA_KEY_HANDLE_INIT macro
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
2020-11-10 16:00:41 +01:00
Johan Pascal
5ef72d214f Style and typos
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
2258a4f481 Do not return a structure, use a return parameter
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
0dbcd1d3f0 Make API safer
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
20c7db3a67 API modified so server side can get mki value
+ client side discards self mki if server does not support it

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
76fdf1d60e Minor fix and improvements
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
d387aa0586 style + missing cast
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:50 +01:00
Johan Pascal
aae4d22b16 Improve code readability
+micro optimization
+style

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
a455cd9a47 mbedtls_ssl_get_srtp_profile_as_string declared and defined in ssl.h
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
f6417ecf60 mki length feats in a uint16_t
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
253d0263a6 set protection profile API gets a MBEDTLS_TLS_SRTP_UNSET terminated list
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
43f9490a52 SRTP profiles definition use macros only
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
4f099264b5 use_srtp extension shall not interfere in the handshake settings
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
d576fdb1d6 Style + fix bound check in write_use_srt_ext
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
9bc97ca19d SRTP-DTLS protection profile configuration list not copied into ssl_config
+ improve test
+ minor style fix

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
8526957cd5 Minor style modifications
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
b64eab7656 fix style
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
65b56ef87f Change key derivation for srtp
Use the export keys functionality, to call the public API
`mbedtls_ssl_tls_prf()`, and remove the function
`mbedtls_ssl_get_dtls_srtp_key_material()`.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
313d7b5d74 Add variable validation
1. Check allocation success.
2. Check parameter correctness in the use_srtp extension
in server and client.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
089c9fe9fa Improve readability
Improve readability of the code:
1. move common code to `ssl_internal.h` as `static inline`.
2. Add comments.
3. Use local variables for extension size.
4. Change function signature, by adding buffer size and output length.
5. Take server srtp profile out of the loop.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
a978804a1b Style fixes
1. Fix indentations.
2. Remove redundant whitespaces.
3. Keep short lines.
4. Grammar fixes.
5. Rephrase function description.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
ef72faf2bb Style fixes
1. Adjust to 80 colums where possible.
2. Add \ remove spaces where needed.
3. Fix alignments.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
b465539476 Add tests and code to support
1. Add DTLS-SRTP tests in `ssl-opts.sh`
2. Add logs for the tests to filter.
3. Add function to get the profile informations.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
1c399bdffe Set authmode to optional, if not set
Set authmode to `MBEDTLS_SSL_VERIFY_REQUIRED` when using dtls-srtp,
in case authmode was not set. This is to support self signed certificates
received by the server, which is the case with webRTC. Certificate fingerprints
are verified outside the dtls stack, as defined in RFC 5763.

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
57cc70ec81 Enforce SRTP mandatory HS messages
Enforce CertificateRequest, client and server Certificates, and
CertificateVerify messages, which are mandatory in DTLS-SRTP,
as defined in RFC 5764 section 4.1

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
a37326abb1 Make keyu material length in \ out
Make the key material length in mbedtls_ssl_get_dtls_srtp_key_material
to be in\out, like it is done all over the library

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
591f162bed support mki value
Add support mki value in the DTLS-SRTP

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Ron Eldor
3adb9928f3 Add mki value and some review comments
1. Add check for prerequisites in check_config.h
2. Add mki value to use_srtp extension
3. address some review comments

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
701984d300 Comply with mbedtls naming rules
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
2d9470be76 Improve DTLS SRTP API with a dedicated function to get generated keys
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
bbc057af73 Move available dtls srtp profile list to ssl_config
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Johan Pascal
b62bb51aff Add RFC5764 - SRTP key generation during DTLS handshake
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
2020-10-29 01:14:49 +01:00
Hanno Becker
a817ea449a Check presence of DTLS timers only once
Mbed TLS requires users of DTLS to configure timer callbacks
needed to implement the wait-and-retransmit logic of DTLS.

Previously, the presence of these timer callbacks was checked
at every invocation of `mbedtls_ssl_fetch_input()`, so lowest
layer of the messaging stack interfacing with the underlying
transport.

This commit removes this recurring check and instead checks the
presence of timers once at the beginning of the handshake.

The main rationale for this change is that it is a step towards
separating the various layers of the messaging stack more cleanly:
datagram layer, record layer, message layer, retransmission layer.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2020-10-20 15:29:14 +01:00
Bence Szépkúti
1e14827beb 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.

Also remove the now-redundant lines declaring that the files are part of
MbedTLS.

This commit was generated using the following script:

# ========================
#!/bin/sh

# Find files
find '(' -path './.git' -o -path './3rdparty' ')' -prune -o -type f -print | xargs sed -bi '

# Replace copyright attribution line
s/Copyright.*Arm.*/Copyright The Mbed TLS Contributors/I

# Remove redundant declaration and the preceding line
$!N
/This file is part of Mbed TLS/Id
P
D
'
# ========================

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
2020-08-19 10:35:41 +02:00
Gilles Peskine
db09ef6d22 Include common.h instead of config.h in library source files
In library source files, include "common.h", which takes care of
including "mbedtls/config.h" (or the alternative MBEDTLS_CONFIG_FILE)
and other things that are used throughout the library.

FROM=$'#if !defined(MBEDTLS_CONFIG_FILE)\n#include "mbedtls/config.h"\n#else\n#include MBEDTLS_CONFIG_FILE\n#endif' perl -i -0777 -pe 's~\Q$ENV{FROM}~#include "common.h"~' library/*.c 3rdparty/*/library/*.c scripts/data_files/error.fmt scripts/data_files/version_features.fmt

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2020-07-02 11:26:57 +02:00
danh-arm
c4b6656a91
Merge pull request #3405 from AndrzejKurek/variable-buffers-cid-serialization
Update iv and len context pointers manually when reallocating buffers
2020-06-17 12:26:24 +01:00
Andrzej Kurek
b657783269
Update iv and len context pointers manually when reallocating buffers
These fields might be shifted accordingly in `ssl_parse_record_header()`
when receiving a connection with CID, so they require a manual update
after calling the generic `mbedtls_ssl_reset_in_out_pointers()`.

This commit also adds a regression test which is run by all.sh.

Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2020-06-16 11:54:51 -04:00
Manuel Pégourié-Gonnard
a92e3def48
Merge pull request #873 from hanno-arm/ssl_write_client_hello
Bounds checks in ssl_write_client_hello
2020-06-15 10:57:51 +02:00
Ronald Cron
8216dd3f34 Use defines to check alpn ext list validity
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
2020-05-29 15:10:30 +02:00
Hanno Becker
f93c2d7ca5 Add support for TLS 1.3 record protection to ssl_populate_transform()
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2020-05-28 10:32:23 +01:00
Hanno Becker
447558df12 Improve documentation of ssl_populate_transform()
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2020-05-28 10:32:23 +01:00
Gilles Peskine
c39a80daee
Merge pull request #3312 from sander-visser/cleanup-nullptr-deref
Scope reduction to enable NULL check to protect dereferencing.
2020-05-11 21:59:07 +02:00
Janos Follath
1a4a3f5924
Merge pull request #3311 from sander-visser/validate-tls-mac-key-len
Add variable initialization to large SSL TLS function
2020-05-11 09:39:01 +01:00
sander-visser
3888b03e31 Add variable initialization to large SSL TLS function.
change triggered by false positive reported by Cppcheck 1.89.

Signed-off-by: sander-visser <github@visser.se>
2020-05-07 20:23:05 +02:00
sander-visser
b8aa2071f6 Scope reduction to enable NULL check to protect dereferencing.
Signed-off-by: sander-visser <github@visser.se>
2020-05-06 22:05:13 +02:00
sander-visser
1abe8ee554 Expose SSL HW record acceleration error.
Fix issue with variable shadowing.

Signed-off-by: sander-visser <github@visser.se>
2020-05-06 21:29:01 +02:00
irwir
d3085ab2b8 Avoid re-assigning zero to ret variable.
Resolve #3182.

Signed-off-by: irwir <irwir@users.noreply.github.com>
2020-04-21 22:26:59 +03:00
Manuel Pégourié-Gonnard
5d318cc22b
Merge pull request #3130 from gbryant-arm/generic-psk
Clarify and simplify PSK
2020-04-14 10:54:01 +02:00
Andrzej Kurek
8ea6872889
Improve pointer calculations when resizing I/O buffers
This commit introduces two changes:
- Add in_msg and out_msg calculations for buffer upsizing. This was previously
considered as unnecessary, but renegotiation using certain ciphersuites needs
this.
- Improving the way out_msg and in_msg pointers are calculated, so that even 
if no resizing is introduced, the pointers remain the same;

New tests added:
- various renegotiation schemes with a range of MFL's and ciphersuites;
- an ssl-opt.sh test exercising two things that were problematic: renegotiation
with TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8 and a server MFL that's smaller
than the one negotiated by the client.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2020-04-09 04:33:00 -04:00
Andrzej Kurek
90c6e84a9c
Split the maximum fragment length into two - an input and output MFL
Since the server might want to have a different maximum fragment length
for the outgoing messages than the negotiated one - introduce a new way of
computing it. This commit also adds additional ssl-opt.sh tests ensuring
that the maximum fragment lengths are set as expected. 
mbedtls_ssl_get_max_frag_len() is now a deprecated function,
being an alias to mbedtls_ssl_get_output_max_frag_len(). The behaviour
of this function is the same as before.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2020-04-09 04:30:34 -04:00
Guilhem Bryant
0c9b1955ca Return internal error if no PSK is found when deriving the premaster secret
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-04-08 13:06:49 +01:00
Guilhem Bryant
03d3711bb1 Fix bracket style
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-04-03 18:21:19 +01:00
Guilhem Bryant
b5f04e4d84 Properly initialise psk and psk_len
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-04-01 11:25:12 +01:00
Guilhem Bryant
61b0fe617e Initialise psk_len in mbedtls_ssl_psk_derive_premaster()
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-03-27 11:15:28 +00:00
Guilhem Bryant
82194c888d Fix bracketing style in ssl_tls.c
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-03-26 17:05:59 +00:00
Guilhem Bryant
c5285d8c40 Use internal PSK getter
Signed-off-by: Guilhem Bryant <Guilhem.Bryant@arm.com>
2020-03-25 17:47:25 +00:00
Gilles Peskine
5e7d6fd240 Merge 'mbedtls/development' into merge-crypto-unremoved-20200304
Merge the latest state of the target branch (mbedtls/development) into the
pull request to merge mbed-crypto into mbedtls.

Conflicts:

* ChangeLog: add/add conflict. Resolve by using the usual section order.
2020-03-23 18:02:07 +01:00
Gilles Peskine
eccd888717 Rename identifiers containing double-underscore
Rename identifiers containing double-underscore (`__`) to avoid `__`.
The reason to avoid double-underscore is that all identifiers
containing double-underscore are reserved in C++. Rename all such
identifiers that appear in any public header, including ssl_internal.h
which is in principle private but in practice is installed with the
public headers.

This commit makes check-names.sh pass.

```
perl -i -pe 's/\bMBEDTLS_SSL__ECP_RESTARTABLE\b/MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED/g; s/\bMBEDTLS_KEY_EXCHANGE_(_\w+)_(_\w+)\b/MBEDTLS_KEY_EXCHANGE${1}${2}/g' include/mbedtls/*.h library/*.c programs/*/*.c scripts/data_files/rename-1.3-2.0.txt tests/suites/*.function
```
2020-03-23 17:55:32 +01:00
Manuel Pégourié-Gonnard
21d1cbccda
Merge pull request #2262 from andresag01/iotssl-2544-deprecate-record-accel
Fix compilation failure when MBEDTLS_SSL_HW_RECORD_ACCEL is enabled
2020-03-16 10:37:16 +01:00
Manuel Pégourié-Gonnard
7ae6ed4435 Keep SSL context const when hw accel is disabled
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2020-03-13 11:28:58 +01:00
Andrzej Kurek
0afa2a1b65
Add I/O buffer resizing in handshake init and free
Add a conditional buffer resizing feature. Introduce tests exercising
it in various setups (serialization, renegotiation, mfl manipulations).
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
2020-03-04 09:28:16 -05:00
Darryl Green
b33cc7688e
Add I/O buffer length fields to mbedtls_ssl_context
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
Signed-off-by: Darryl Green <darryl.green@arm.com>
2020-03-03 10:44:49 -05:00
Manuel Pégourié-Gonnard
e07bc20155 Fix compile errors with MBEDTLS_SSL_HW_RECORD_ACCEL
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2020-02-26 09:53:42 +01:00
Hanno Becker
9d062f9cd7 Move ssl_mac() from ssl_tls.c to ssl_msg.c 2020-02-07 11:38:03 +00:00
Hanno Becker
af752d4bd6 Remove code from ssl_tls.c & ssl_msg.c to get disjoint functionality
This commit is the final step in separating the functionality of
what was originally ssl_tls.c into both ssl_tls.c and ssl_msg.c.

So far, ssl_msg.c has been created as an identical copy of ssl_tls.c.
For each block of code in these files, this commit removes it from
precisely one of the two files, depending on where the respective
functionality belongs.

The splitting separates the following functionalities:

1) An implementation of the TLS and DTLS messaging layer, that is,
   the record layer as well as the DTLS retransmission state machine.

   This is now contained in ssl_msg.c

2) Handshake parsing and writing functions shared between client and
   server (functions specific to either client or server are implemented
   in ssl_cli.c and ssl_srv.c, respectively).

   This is remains in ssl_tls.c.
2020-02-05 16:12:24 +00:00
Hanno Becker
471c0c98f6 Rename temporary copy ssl_tls_old.c back to ssl_tls.c 2020-02-05 16:10:22 +00:00
Hanno Becker
abd9cef520 Duplicate ssl_tls.c as ssl_tls_old.c and ssl_msg.c
This commit is the first in a series of commits aiming to split
the content of ssl_tls.c in two files ssl_tls.c and ssl_msg.c.

As a first step, this commit replaces ssl_tls.c by two identical
copies ssl_tls_old.c and ssl_msg.c. Even though the file
ssl_tls_old.c will subsequently be renamed back into ssl_tls.c,
this approach retains the git history in both files.
2020-02-05 16:08:41 +00:00
Hanno Becker
89490716e9 Move ssl_get_current_mtu() to public namespace 2020-02-05 10:50:52 +00:00
Hanno Becker
533ab5f5c2 Move flight and message buffering functions to public namespace 2020-02-05 10:50:52 +00:00
Hanno Becker
40cdaa1263 Move ssl_start_renegotiation() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
ce5f5fdcb4 Move ssl_handshake_wrapup_free_hs_transform() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
786300f898 Move ssl_resend_hello_request() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
7e8e6a6870 Move ssl_dtls_replay_reset() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
43aefe2321 Move ssl_session_reset_int() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
3e6f8ab14a Move SSL internal pointer updating routines to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
7876d127a9 Move ssl_check_timer() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
dd77229184 Move ssl_ep_len() to public namespace 2020-02-05 10:50:51 +00:00
Hanno Becker
0f57a65391 Move ssl_set_timer() to public namespace 2020-02-05 10:50:45 +00:00
Manuel Pégourié-Gonnard
c40b685837 Fix bug in record decompression
ssl_decompress_buf() was operating on data from the ssl context, but called at
a point where this data is actually in the rec structure. Call it later so
that the data is back to the ssl structure.
2020-01-24 10:44:13 +01:00
jiblime
9f25b8deff Fixes definition error when the deprecated MBEDTLS_ZLIB_SUPPORT and ENABLE_ZLIB_SUPPORT macro are defined/enabled for zlib support in mbedtls
100% tests passed, 0 tests failed out of 85

https://github.com/ARMmbed/mbedtls/blob/mbedtls-2.19.1/library/ssl_tls.c#L1842

https://github.com/ARMmbed/mbedtls/blob/mbedtls-2.19.1/library/ssl_tls.c#L1862
2020-01-24 09:34:06 +01:00
Janos Follath
73c616bdc1 Put includes in alphabetical order
The library style is to start with the includes corresponding to the
current module and then the rest in alphabetical order. Some modules
have several header files (eg. ssl_internal.h).

The recently added error.h includes did not respect this convention and
this commit restores it. In some cases this is not possible just by
moving the error.h declarations. This commit fixes the pre-existing
order in these instances too.
2019-12-19 10:27:57 +00:00
Janos Follath
865b3ebf84 Initialize return values to an error
Initializing the return values to an error is best practice and makes
the library more robust against programmer errors.
2019-12-16 15:15:16 +00:00
Jaeden Amero
1a61d455e9
Merge pull request #2841 from k-stachowiak/improve-memory-operation-clarity
Improve clarity of a memory operation call
2019-12-09 19:54:29 +02:00
Piotr Nowicki
9926eaf695 Do not allow configuring zero-length PSK
fix error when calloc is called with size 0
2019-11-25 15:49:53 +01:00
Jaeden Amero
5d74241b54 Merge remote-tracking branch 'origin/pr/2854' into development
* origin/pr/2854:
  Shorter version of mbedtls_ssl_send_fatal_handshake_failure
  Resolve #2801 - remove repetitive assignment to ssl->in_msg (the first value was never used)
  Resolve #2800 - move declaration to avoid unused variable warning in case MBEDTLS_SSL_PROTO_DTLS was undefined
  Resolve #2717 - remove erroneous sizeof (the operator was applied to constant integer number)
2019-11-22 10:20:19 +00:00
Arto Kinnunen
7f8089b2ec Fix mbedtls_ssl_check_record usage with ext buf
Record checking fails if mbedtls_ssl_check_record() is called with
external buffer. Received record sequence number is available in the
incoming record but it is not available in the ssl contexts `in_ctr`-
variable that is used when decoding the sequence number.

To fix the problem, temporarily update ssl context `in_ctr` to
point to the received record header and restore value later.
2019-10-29 13:51:37 +02:00
irwir
6c0da64094 Shorter version of mbedtls_ssl_send_fatal_handshake_failure 2019-10-28 19:54:04 +03:00
irwir
89af51ff39 Resolve #2801 - remove repetitive assignment to ssl->in_msg (the first value was never used) 2019-09-26 21:04:56 +03:00
irwir
734f0cf65e Resolve #2800 - move declaration to avoid unused variable warning in case MBEDTLS_SSL_PROTO_DTLS was undefined 2019-09-26 21:03:24 +03:00
irwir
40883e91a6 Resolve #2717 - remove erroneous sizeof (the operator was applied to constant integer number) 2019-09-26 21:00:56 +03:00
Gilles Peskine
311f54d0ee tls_prf: support an empty master secret
In TLS, the master secret is always a key. But EAP-TLS uses the TLS
PRF to derive an IV with an empty string for the "secret" input. The
code always stored the secret into a key slot before calling the TLS
PRF, but this doesn't work when the secret is empty, since PSA Crypto
no longer supports empty keys. Add a special case for an empty secret.
2019-09-23 18:19:22 +02:00
k-stachowiak
95b68ef5ae Improve clarity of a memory operation call 2019-09-16 12:21:00 +02:00
Jaeden Amero
fa63645ec8 ssl: Remove key exporter bug workaround
It is no longer necessary to cast the randbytes to non-const when
exporting keys.
2019-09-12 15:18:25 +01:00
Hanno Becker
361b10d1c4 Fix SSL context deserialization
The SSL context maintains a set of 'out pointers' indicating the
address at which to write the header fields of the next outgoing
record. Some of these addresses have a static offset from the
beginning of the record header, while other offsets can vary
depending on the active record encryption mechanism: For example,
if an explicit IV is in use, there's an offset between the end
of the record header and the beginning of the encrypted data to
allow the explicit IV to be placed in between; also, if the DTLS
Connection ID (CID) feature is in use, the CID is part of the
record header, shifting all subsequent information (length, IV, data)
to the back.
When setting up an SSL context, the out pointers are initialized
according to the identity transform + no CID, and it is important
to keep them up to date whenever the record encryption mechanism
changes, which is done by the helper function ssl_update_out_pointers().

During context deserialization, updating the out pointers according
to the deserialized record transform went missing, leaving the out
pointers the initial state. When attemping to encrypt a record in
this state, this lead to failure if either a CID or an explicit IV
was in use. This wasn't caught in the tests by the bad luck that
they didn't use CID, _and_ used the default ciphersuite based on
ChaChaPoly, which doesn't have an explicit IV. Changing either of
this would have made the existing tests fail.

This commit fixes the bug by adding a call to ssl_update_out_pointers()
to ssl_context_load() implementing context deserialization.

Extending test coverage is left for a separate commit.
2019-08-30 12:14:25 +01:00
k-stachowiak
81053a5584 Use multipart PSA key derivation API 2019-08-17 11:43:35 +02:00
Jarno Lamsa
b7b486cfd1 Fix compiler warning
Fix a compiler warning when MBEDTLS_SHA512_C isn't defined.
2019-08-23 13:11:31 +03:00
Jarno Lamsa
8c51b7cd94 Add debug messages
Add debug messages to easier identify which condition fails
with usage restrictions in mbedtls_ssl_context_save()
2019-08-23 13:11:31 +03:00
Jarno Lamsa
c84bd24224 Add missing guards for mac usage
There were couple of cases where guards were missing when
no ciphersuites are using mac.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
e458869b3f Improve reability and debugability of large if
Breaking into a series of statements makes things easier when stepping through
the code in a debugger.

Previous comments we stating the opposite or what the code tested for (what we
want vs what we're erroring out on) which was confusing.

Also expand a bit on the reasons for these restrictions.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
4ca930f8b9 Fix a typo in a comment 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
f041f4e19c Fix MSVC warning
We know the length of the ALPN string is always less than 255, so the cast to
uint8_t is safe.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
9a96fd7ac3 Fix compile error in reduced configurations
Found by running scripts/baremetal.h --rom --gcc --check after adding
MBEDTLS_SSL_CONTEXT_SERIALIZATION to baremetal.h
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
45ac1f0c92 Avoid duplication of session format header 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
4e9370ba91 Implement config-checking header to context s11n
Modelled after the config-checking header from session s11n.

The list of relevant config flags was established by manually checking the
fields serialized in the format, and which config.h flags they depend on.
This probably deserves double-checking by reviewers.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
5c0e377532 Provide serialisation API only if it's enabled 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
5ea13b854a Fix compiler warning: comparing signed to unsigned
Since the type of cid_len is unsigned but shorter than int, it gets
"promoted" to int (which is also the type of the result), unless we make the
other operand an unsigned int which then forces the expression to unsigned int
as well.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
9df5a82079 Actually reset the context on save as advertised
Also fix some wording in the documentation while at it.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
142ba736d9 Re-use buffer allocated by handshake_init()
This fixes a memory leak as well (found by running ssl-opt.sh in an Asan
build).
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
0eb3eac023 Add setting of forced fields when deserializing 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
c86c5df081 Add saved fields from top-level structure 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
c2a7b891a1 Add transform (de)serialization 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
b9dfc9fd30 Fix English in comments 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
4b7e6b925f Add session saving/loading
For now, the header (version+format bytes) is duplicated. This might be
optimized later.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
4c90e858b5 Add (stub) header writing and checking
The number of meaning of the flags will be determined later, when handling the
relevant struct members. For now three bytes are reserved as an example, but
this number may change later.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
0ff76407d2 Add usage checks in context_load() 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
00400c2bf6 Document internal serialisation format
This mainly follows the design document (saving all fields marked "saved" in
the main structure and the transform sub-structure) with two exceptions:

- things related to renegotiation are excluded here (there weren't quite in
  the design document as the possibility of allowing renegotiation was still
on the table, which is no longer is) - also, ssl.secure_renegotiation (which
is not guarded by MBEDTLS_SSL_RENEGOTIATION because it's used in initial
handshakes even with renegotiation disabled) is still excluded, as we don't
need it after the handshake.

- things related to Connection ID are added, as they weren't present at the
  time the design document was written.

The exact format of the header (value of the bitflag indicating compile-time
options, whether and how to merge it with the serialized session header) will
be determined later.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
1aaf66940e Implement usage checks in context_save()
Enforce restrictions indicated in the documentation.

This allows to make some simplifying assumptions (no need to worry about
saving IVs for CBC in TLS < 1.1, nor about saving handshake data) and
guarantees that all values marked as "forced" in the design document have the
intended values and can be skipped when serialising.

Some of the "forced" values are not checked because their value is a
consequence of other checks (for example, session_negotiated == NULL outside
handshakes). We do however check that session and transform are not NULL (even
if that's also a consequence of the initial handshake being over) as we're
going to dereference them and static analyzers may appreciate the info.
2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
96fb0ee9cf Save Hello random bytes for later use 2019-08-23 13:11:31 +03:00
Manuel Pégourié-Gonnard
6d8f128790 Fix typos, grammar and wording in documentation 2019-08-23 12:52:29 +03:00
Manuel Pégourié-Gonnard
ac87e28bb2 Declare and document ssl_context_save()/load()
Also introduce stub definitions so that things compile and link.
2019-08-23 12:52:29 +03:00
Hanno Becker
be34e8e9c0 Remove reference to outdated compile-time option 2019-08-23 12:51:21 +03:00
Hanno Becker
f9b3303eb9 Introduce specific error for ver/cfg mismatch on deserialization
This commit introduces a new SSL error code

  `MBEDTLS_ERR_SSL_VERSION_MISMATCH`

which can be used to indicate operation failure due to a
mismatch of version or configuration.

It is put to use in the implementation of `mbedtls_ssl_session_load()`
to signal the attempt to de-serialize a session which has been serialized
in a build of Mbed TLS using a different version or configuration.
2019-08-23 12:51:21 +03:00
Hanno Becker
3e08866e06 Use def'n consts for bits in config-identifier of serialized data 2019-08-23 12:51:21 +03:00
Hanno Becker
dc28b6c5e1 Note that ver+fmt bytes in serialized data must not be removed 2019-08-23 12:51:21 +03:00
Hanno Becker
50b596666d Improve doc'n of config-identifying bitfield in serialized session 2019-08-23 12:51:21 +03:00
Hanno Becker
f37d91830a Session serialization: Fail with BAD_INPUT_DATA if buffer too small 2019-08-23 12:51:21 +03:00
Hanno Becker
94ef3b35f4 Encode relevant parts of the config in serialized session header
This commit makes use of the added space in the session header to
encode the state of those parts of the compile-time configuration
which influence the structure of the serialized session in the
present version of Mbed TLS. Specifically, these are
- the options which influence the presence/omission of fields
  from mbedtls_ssl_session (which is currently shallow-copied
  into the serialized session)
- the setting of MBEDTLS_X509_CRT_PARSE_C, which determines whether
  the serialized session contains a CRT-length + CRT-value pair after
  the shallow-copied mbedtls_ssl_session instance.
- the setting of MBEDTLS_SSL_SESSION_TICKETS, which determines whether
  the serialized session contains a session ticket.
2019-08-23 12:51:21 +03:00
Hanno Becker
f878707b8f Add configuration identifier to serialized SSL sessions
This commit adds space for two bytes in the header of serizlied
SSL sessions which can be used to determine the structure of the
remaining serialized session in the respective version of Mbed TLS.

Specifically, if parts of the session depend on whether specific
compile-time options are set or not, the setting of these options
can be encoded in the added space.

This commit doesn't yet make use of the fields.
2019-08-23 12:51:21 +03:00
Hanno Becker
a835da5cb1 Add Mbed TLS version to SSL sessions
The format of serialized SSL sessions depends on the version and the
configuration of Mbed TLS; attempts to restore sessions established
in different versions and/or configurations lead to undefined behaviour.

This commit adds an 3-byte version header to the serialized session
generated and cleanly fails ticket parsing in case a session from a
non-matching version of Mbed TLS is presented.
2019-08-23 12:51:21 +03:00
Manuel Pégourié-Gonnard
f743c03ea7 Add new ABI-independent format for serialization 2019-08-23 12:50:17 +03:00
Manuel Pégourié-Gonnard
51a0bfd9bc Fix bug in cert digest serialisation
This bug was present since cert digest had been introduced, which highlights
the need for testing.

While at it, fix a bug in the comment explaining the format - this was
introduced by me copy-pasting to hastily from current baremetal, that has a
different format (see next PR in the series for the same in development).
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
686adb4d54 Normalize spelling to serialiZation
We have explicit recommendations to use US spelling for technical writing, so
let's apply this to code as well for uniformity. (My fingers tend to prefer UK
spelling, so this needs to be fixed in many places.)

sed -i 's/\([Ss]eriali\)s/\1z/g' **/*.[ch] **/*.function **/*.data ChangeLog
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
a3d831b9e6 Add test for session_load() from small buffers
This uncovered a bug that led to a double-free (in practice, in general could
be free() on any invalid value): initially the session structure is loaded
with `memcpy()` which copies the previous values of pointers peer_cert and
ticket to heap-allocated buffers (or any other value if the input is
attacker-controlled). Now if we exit before we got a chance to replace those
invalid values with valid ones (for example because the input buffer is too
small, or because the second malloc() failed), then the next call to
session_free() is going to call free() on invalid pointers.

This bug is fixed in this commit by always setting the pointers to NULL right
after they've been read from the serialised state, so that the invalid values
can never be used.

(An alternative would be to NULL-ify them when writing, which was rejected
mostly because we need to do it when reading anyway (as the consequences of
free(invalid) are too severe to take any risk), so doing it when writing as
well is redundant and a waste of code size.)

Also, while thinking about what happens in case of errors, it became apparent
to me that it was bad practice to leave the session structure in an
half-initialised state and rely on the caller to call session_free(), so this
commit also ensures we always clear the structure when loading failed.
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
26f982f50e Improve save API by always updating olen
This allows callers to discover what an appropriate size is. Otherwise they'd
have to either try repeatedly, or allocate an overly large buffer (or some
combination of those).

Adapt documentation an example usage in ssl_client2.
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
b5e4e0a395 Add mbedtls_ssl_get_session_pointer()
Avoid useless copy with mbedtls_ssl_get_session() before serialising.

Used in ssl_client2 for testing and demonstrating usage, but unfortunately
that means mbedtls_ssl_get_session() is no longer tested, which will be fixed
in the next commit.
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
35eb802103 Add support for serialisation session with ticket
On client side, this is required for the main use case where of serialising a
session for later resumption, in case tickets are used.

On server side, this doesn't change much as ticket_len will always be 0.

This unblocks testing the functions by using them in ssl_client2, which will
be done in the next commit.
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
a3e7c65101 Move session save/load function to ssl_tls.c
This finishes making these functions public. Next step is to get them tested,
but there's currently a blocker for that, see next commit (and the commit
after it for tests).
2019-08-23 12:48:41 +03:00
Manuel Pégourié-Gonnard
8faa70e810 Use more specific name in debug message for testing
While 'session hash' is currently unique, so suitable to prove that the
intended code path has been taken, it's a generic enough phrase that in the
future we might add other debug messages containing it in completely unrelated
code paths. In order to future-proof the accuracy of the test, let's use a
more specific string.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
d91efa47c0 Fix alignment issues 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
47e33e11f7 Clarify comment about TLS versions
The previous comment used "TLS" as a shortcut for "TLS 1.0/1.1" which was
confusing. This partially reflected the names of the calc_verify/finished that
go ssl, tls (for 1.0/1.1) tls_shaxxx (for 1.2), but still it's clearer to be
explicit in the comment - and perhaps in the long term the function names
could be clarified instead.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
7fa1407adb Remove redundant debug message.
Two consecutive messages (ie no branch between them) at the same level are not
needed, so only keep the one that has the most information.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
6fa57bfae5 Remove 'session' input from populate_tranform()
When using this function to deserialize, it's not a problem to have a session
structure as input as we'll have one around anyway (most probably freshly
deserialised).

However for tests it's convenient to be able to build a transform without
having a session structure around.

Also, removing this structure from parameters makes the function signature
more uniform, the only exception left being the ssl param at the end that's
hard to avoid for now.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
31d3ef11f5 Fix typo in comment 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
a7505d18eb Enforce promise to not use whole ssl context
Configs with no DEBUG_C are used for example in test-ref-configs.pl, which also
runs parts of compat.sh or ssl-opt.sh on them, so the added 'ssl = NULL'
statements will be exercised in those tests at least.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
c864f6a209 Partially rm 'ssl' input from populate_transform() 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
9b108c242d Remove "handshake" input from populate_transform() 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
344460c913 Work around bug in key exporter API
https://github.com/ARMmbed/mbedtls/issues/2759
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
cba40d92bd Start refining parameters of populate_transform()
Parameters 'handshake' and 'ssl' will be replaced with more fine-grained
inputs in follow-up commits.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
d73b47fe2e Move compress_buf allocation to derive_keys 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
040a9517b5 Move handling of randbytes to derive_keys() 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
de718b99b5 Make calc_verify() return the length as well
Simplifies ssl_compute_hash(), but unfortunately not so much the other uses.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
0d56aaac7b Constify ssl_context param of calc_verify() 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
de047adfb4 Improve signature of ssl_compute_master()
Make it more explicit what's used. Unfortunately, we still need ssl as a
parameter for debugging, and because calc_verify wants it as a parameter (for
all TLS versions except SSL3 it would actually only need handshake, but SSL3
also accesses session_negotiate).

It's also because of calc_verify that we can't make it const yet, but see next
commit.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
85680c49ef Reduce indentation in ssl_compute_master()
Exit earlier when there's noting to do.

For a small diff, review with 'git show -w'.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
9951b712bd Start extracting ssl_compute_master()
For now just moving code around, not changing indentation. Calling convention
and signature are going to be adjusted in upcoming commits.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
8d2805c784 Fix signature of ssl_set_transform_prfs() 2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
1b00c4f5b3 Start extraction ssl_set_handshake_prfs()
For now just moving code around, will improve signature in the next commit.
2019-08-23 12:45:33 +03:00
Manuel Pégourié-Gonnard
e59ae23868 Start splitting populate_transform() out of derive_keys()
This is currently a dummy, just introducing the new name.
2019-08-23 12:45:33 +03:00
Jaeden Amero
beec142010 Merge remote-tracking branch 'origin/pr/2790' into development
* origin/pr/2790: (40 commits)
  Fix possibly-lossy conversion warning from MSVC
  Reintroduce length 0 check for records
  Don't use memcpy() for 2-byte copy operation
  Remove integer parsing macro
  Fix alignment in record header parsing routine
  Don't disallow 'record from another epoch' log msg in proxy ref test
  Make sure 'record from another epoch' is displayed for next epoch
  Implement record checking API
  Mark ssl_parse_record_header() as `const` in SSL context
  Make mbedtls_ssl_in_hdr_len() CID-unaware
  Remove duplicate setting of ssl->in_msgtype and ssl->in_msglen
  Move update of in_xxx fields in ssl_get_next_record()
  Move update of in_xxx fields outside of ssl_prepare_record_content()
  Reduce dependency of ssl_prepare_record_content() on in_xxx fields
  Move ssl_update_in_pointers() to after record hdr parsing
  Mark DTLS replay check as `const` on the SSL context
  Move updating the internal rec ptrs to outside of rec hdr parsing
  Mark ssl_decrypt_buf() as `const in the input SSL context
  Adapt ssl_prepare_record_content() to use SSL record structure
  Use record length from record structure when fetching content in TLS
  ...
2019-08-22 11:09:15 +01:00
Jaeden Amero
9a09f511b5 Merge remote-tracking branch 'origin/pr/2781' into development
* origin/pr/2781:
  Documentation fixes according to review
  Remove unused label in ssl_client2/ssl_server2
  Add missing word in documentation of mbedtls_ssl_check_record()
  cli/srv ex: Add dbg msg if record checking gives inconsistent result
  Fix minor issues in documentation of mbedtls_ssl_check_record()
  State that record checking is DTLS only and doesn't check content type
  Update version_features.c
  Pass dgrams to mbedtls_ssl_check_record in ssl_client2/server2
  Add IO wrappers to ssl_server2 as interm's between NET and SSL layer
  Add IO wrappers to ssl_client2 as interm's between NET and SSL layer
  Introduce configuration option and API for SSL record checking
2019-08-22 11:08:52 +01:00
Janos Follath
da6ac01963 Rename local variables 2019-08-16 13:47:29 +01:00
Janos Follath
1239d70870 Remove calls to psa_allocate_key
In PSA 1.0 keys are allocated implicitly by other functions
(like psa_import_key) and psa_allocate_key is not needed and does not
exist anymore.
2019-08-16 13:37:32 +01:00
Janos Follath
53b8ec27a2 Make variable naming consistent 2019-08-16 13:37:32 +01:00
Janos Follath
ed73b04c6e Update psa_import_key to PSA 1.0 2019-08-16 13:36:15 +01:00
Janos Follath
bd096101b5 Update psa_generator_abort to PSA 1.0 2019-08-16 11:45:55 +01:00
Janos Follath
6de99db449 Update psa_generator_read to PSA 1.0 2019-08-16 11:45:55 +01:00
Janos Follath
8dee877e8a Update psa_crypto_generator_t to PSA 1.0 2019-08-16 11:45:55 +01:00
Janos Follath
7374ee6139 Update GENERATOR_INIT macro to PSA 1.0 2019-08-16 11:45:55 +01:00
Jaeden Amero
922013e46d tls: Remove duplicate psa_util.h include
Don't include psa_util.h twice. It's enough to include it once.
2019-08-15 15:44:50 +01:00
Manuel Pégourié-Gonnard
7e821b5bcd Fix possibly-lossy conversion warning from MSVC
ssl_tls.c(4876): warning C4267: '=': conversion from 'size_t' to 'uint8_t', possible loss of data
2019-08-14 15:08:09 +01:00
Hanno Becker
d417cc945c Reintroduce length 0 check for records 2019-08-14 15:08:08 +01:00
Hanno Becker
d0b66d08bb Don't use memcpy() for 2-byte copy operation
Manual copying is slightly shorter here.
2019-08-14 15:08:08 +01:00
Hanno Becker
9eca276768 Remove integer parsing macro
If this is introduced, it should be defined in a prominent place
and put to use throughout the library, but this is left for another
time.
2019-08-14 15:08:08 +01:00
Hanno Becker
f5466258b4 Fix alignment in record header parsing routine 2019-08-14 15:08:08 +01:00
Hanno Becker
552f747216 Make sure 'record from another epoch' is displayed for next epoch
The test 'DTLS proxy: delay ChangeCipherSpec' from ssl-opt.sh
relies on this.
2019-08-14 15:08:08 +01:00
Hanno Becker
5422981052 Implement record checking API
This commit implements the record checking API

   mbedtls_ssl_check_record()

on top of the restructured incoming record stack.

Specifically, it makes use of the fact that the core processing routines

  ssl_parse_record_header()
  mbedtls_ssl_decrypt_buf()

now operate on instances of the SSL record structure mbedtls_record
instead of the previous mbedtls_ssl_context::in_xxx fields.
2019-08-14 15:08:08 +01:00
Hanno Becker
331de3df9a Mark ssl_parse_record_header() as const in SSL context 2019-08-14 15:08:08 +01:00
Hanno Becker
b0fe0eedce Remove duplicate setting of ssl->in_msgtype and ssl->in_msglen 2019-08-14 15:06:44 +01:00
Hanno Becker
44d89b2d53 Move update of in_xxx fields in ssl_get_next_record()
ssl_get_next_record() updates the legacy in_xxx fields in two places,
once before record decryption and once after. Now that record decryption
doesn't use or affect the in_xxx fields anymore, setting up the these
legacy fields can entirely be moved to the end of ssl_get_next_record(),
which is what this comit does.

This commit solely moves existing code, but doesn't yet simplify the
now partially redundant settings of the in_xxx fields. This will be
done in a separate commit.
2019-08-14 15:06:44 +01:00
Hanno Becker
8685c822c1 Move update of in_xxx fields outside of ssl_prepare_record_content()
Multiple record attributes such as content type and payload length
may change during record decryption, and the legacy in_xxx fields
in the SSL context therefore need to be updated after the record
decryption routine ssl_decrypt_buf() has been called.

After the previous commit has made ssl_prepare_record_content()
independent of the in_xxx fields, setting them can be moved
outside of ssl_prepare_record_content(), which is what this
commit does.
2019-08-14 15:06:44 +01:00
Hanno Becker
58ef0bf19f Reduce dependency of ssl_prepare_record_content() on in_xxx fields 2019-08-14 15:06:44 +01:00
Hanno Becker
d8bf8ceeb4 Move ssl_update_in_pointers() to after record hdr parsing
Previously, ssl_update_in_pointers() ensured that the in_xxx pointers
in the SSL context are set to their default state so that the record
header parsing function ssl_parse_record_header() could make use of them.
By now, the latter is independent of these pointers, so they don't need
to be setup before calling ssl_parse_record_header() anymore.
However, other parts of the messaging stack might still depend on it
(to be studied), and hence this commit does not yet reomve
ssl_update_in_pointers() entirely.
2019-08-14 15:06:06 +01:00
Hanno Becker
0183d699bf Mark DTLS replay check as const on the SSL context 2019-08-14 15:06:06 +01:00
Hanno Becker
7ae20e0f4c Move updating the internal rec ptrs to outside of rec hdr parsing
The stack maintains pointers mbedtls_ssl_context::in_xxx pointing to
various parts of the [D]TLS record header. Originally, these fields
were determined and set in ssl_parse_record_header(). By now,
ssl_parse_record_header() has been modularized to setup an instance
of the internal SSL record structure mbedtls_record, and to derive
the old in_xxx fields from that.

This commit takes a further step towards removing the in_xxx fields
by deriving them from the established record structure _outside_ of
ssl_parse_record_header() after the latter has succeeded.

One exception is the handling of possible client reconnects,
which happens in the case then ssl_parse_record_header() returns
MBEDTLS_ERR_SSL_UNEXPECTED_RECORD; since ssl_check_client_reconnect()
so far uses the in_xxx fields, they need to be derived from the
record structure beforehand.
2019-08-14 15:06:06 +01:00
Hanno Becker
605949f84c Mark ssl_decrypt_buf() as `const in the input SSL context
In fact, the SSL context is only used to access the debug callback.
2019-08-14 15:06:06 +01:00
Hanno Becker
fdf660426d Adapt ssl_prepare_record_content() to use SSL record structure 2019-08-14 15:06:06 +01:00
Hanno Becker
a31756619c Use record length from record structure when fetching content in TLS 2019-08-14 15:06:06 +01:00
Hanno Becker
f50da50c04 Use record structure when remembering offset of next record in dgram 2019-08-14 15:06:06 +01:00
Hanno Becker
4acada35f5 Use SSL record structure when skipping over unexpected record 2019-08-14 15:06:06 +01:00
Hanno Becker
519f15dbba Adapt ssl_buffer_future_record() to work with SSL record structure 2019-08-14 15:06:05 +01:00
Hanno Becker
e5e7e7833c Setup SSL record structure in ssl_parse_record_header()
This commit makes a first step towards modularizing the incoming record
processing by having it operate on instances of the structure mbedtls_record
representing SSL records.

So far, only record encryption/decryption operate in terms of record
instances, but the rest of the parsing doesn't. In particular,
ssl_parse_record_header() operates directly on the fixed input buffer,
setting the various ssl->in_xxx pointers and fields, and only directly
before/after calling ssl_decrypt_buf() these fields a converted to/from
mbedtls_record instances.

This commit does not yet remove the ssl->in_xxx fields, but makes a step
towards extending the lifetime of mbedtls_record structure representing
incoming records, by modifying ssl_parse_record_header() to setup an
instance of mbedtls_record, and setting the ssl->in_xxx fields from that
instance. The instance so-constructed isn't used further so far, and in
particular it is not yet consolidated with the instance set up for use
in ssl_decrypt_record(). That's for a later commit.
2019-08-14 15:06:04 +01:00
Hanno Becker
37cfe73c92 Minor documentation improvements in ssl_parse_record_header() 2019-08-14 14:45:20 +01:00
Hanno Becker
955a5c98df Check for sufficient datagram size in ssl_parse_record_header()
Previously, ssl_parse_record_header() did not check whether the current
datagram is large enough to hold a record of the advertised size. This
could lead to records being silently skipped over or backed up on the
basis of an invalid record length. Concretely, the following would happen:

1) In the case of a record from an old epoch, the record would be
   'skipped over' by setting next_record_offset according to the advertised
   but non-validated length, and only in the subsequent mbedtls_ssl_fetch_input()
   it would be noticed in an assertion failure if the record length is too
   large for the current incoming datagram.
   While not critical, this is fragile, and also contrary to the intend
   that MBEDTLS_ERR_SSL_INTERNAL_ERROR should never be trigger-able by
   external input.
2) In the case of a future record being buffered, it might be that we
   backup a record before we have validated its length, hence copying
   parts of the input buffer that don't belong to the current record.
   This is a bug, and it's by luck that it doesn't seem to have critical
   consequences.

This commit fixes this by modifying ssl_parse_record_header() to check that
the current incoming datagram is large enough to hold a record of the
advertised length, returning MBEDTLS_ERR_SSL_INVALID_RECORD otherwise.
2019-08-14 14:44:55 +01:00
Hanno Becker
d5c0f826e6 Don't send an alert when receiving a record of unknown ContentType
We don't send alerts on other instances of ill-formed records,
so why should we do it here? If we want to keep it, the alerts
should rather be sent ssl_get_next_record().
2019-08-14 14:44:36 +01:00
Hanno Becker
a8814794e9 Don't call ssl_fetch_input for record content fetch in DTLS
As explained in the previous commit, if mbedtls_ssl_fetch_input()
is called multiple times, all but the first call are equivalent to
bounds checks in the incoming datagram.
2019-08-14 14:43:46 +01:00
Hanno Becker
59be60e98b Don't call ssl_fetch_input for record hdr size check in DTLS
In DTLS, if mbedtls_ssl_fetch_input() is called multiple times without
resetting the input buffer in between, the non-initial calls are functionally
equivalent to mere bounds checks ensuring that the incoming datagram is
large enough to hold the requested data. In the interest of code-size
and modularity (removing a call to a non-const function which is logically
const in this instance), this commit replaces such a call to
mbedtls_ssl_fetch_input() by an explicit bounds check in
ssl_parse_record_header().
2019-08-14 14:41:57 +01:00
Hanno Becker
e538d8287e Move size-check for DTLS record header with CID to DTLS-only branch 2019-08-14 14:41:37 +01:00
Hanno Becker
2fddd3765e Check same-port-reconnect from client outside of record hdr parsing
Previously, `ssl_handle_possible_reconnect()` was part of
`ssl_parse_record_header()`, which was required to return a non-zero error
code to indicate a record which should not be further processed because it
was invalid, unexpected, duplicate, .... In this case, some error codes
would lead to some actions to be taken, e.g. `MBEDTLS_ERR_SSL_EARLY_MESSAGE`
to potential buffering of the record, but eventually, the record would be
dropped regardless of the precise value of the error code. The error code
`MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED` returned from
`ssl_handle_possible_reconnect()` did not receive any special treatment and
lead to silent dopping of the record - in particular, it was never returned
to the user.

In the new logic this commit introduces, `ssl_handle_possible_reconnect()` is
part of `ssl_check_client_reconnect()` which is triggered _after_
`ssl_parse_record_header()` found an unexpected record, which is already in
the code-path eventually dropping the record; we want to leave this code-path
only if a valid cookie has been found and we want to reset, but do nothing
otherwise. That's why `ssl_handle_possible_reconnect()` now returns `0` unless
a valid cookie has been found or a fatal error occurred.
2019-08-14 14:41:06 +01:00
Hanno Becker
4894873b92 Remove redundant minimum length check
Availability of sufficient incoming data should be checked when
it is needed, which is in mbedtls_ssl_fetch_input(), and this
function has the necessary bounds checks in place.
2019-08-14 14:34:49 +01:00
Hanno Becker
20016654c3 Remove unnecessary backup of explicit IV in AEAD record decryption
There is no need to hold back the explicit IV for AEAD ciphers.
2019-08-14 14:34:26 +01:00
Hanno Becker
d96a652d80 Improve documentation of mbedtls_ssl_decrypt_buf() 2019-08-14 14:34:04 +01:00
Hanno Becker
c957e3b5f8 Remove redundant length check during record header parsing
The check is in terms of the internal input buffer length and is
hence likely to be originally intended to protect against overflow
of the input buffer when fetching data from the underlying
transport in mbedtls_ssl_fetch_input(). For locality of reasoning,
it's better to perform such a check close to where it's needed,
and in fact, mbedtls_ssl_fetch_input() _does_ contain an equivalent
bounds check, too, rendering the bounds check in question redundant.
2019-08-14 14:33:39 +01:00
Hanno Becker
e2b786d40f Remove misleading comment in mbedtls_ssl_decrypt_buf()
The comment doesn't seem to relate to the code that follows.
2019-08-14 14:33:09 +01:00
Hanno Becker
47ebaa2205 Remove assertion in mbedtls_ssl_decrypt_buf()
mbedtls_ssl_decrypt_buf() asserts that the passed transform is not NULL,
but the function is only invoked in a single place, and this invocation
is clearly visible to be within a branch ensuring that the incoming
transform isn't NULL. Remove the assertion for the benefit of code-size.
2019-08-14 14:32:39 +01:00
Hanno Becker
d96e10bf23 Check architectural bound for max record payload len in one place
The previous code performed architectural maximum record length checks
both before and after record decryption. Since MBEDTLS_SSL_IN_CONTENT_LEN
bounds the maximum length of the record plaintext, it suffices to check
only once after (potential) decryption.

This must not be confused with the internal check that the record
length is small enough to make the record fit into the internal input
buffer; this is done in mbedtls_ssl_fetch_input().
2019-08-14 14:31:58 +01:00
Hanno Becker
3be264e2c3 Remove redundant length-0 checks for incoming unprotected records 2019-08-14 14:30:51 +01:00
Hanno Becker
cfe457921a Introduce configuration option and API for SSL record checking 2019-08-06 10:09:08 +03:00
Jaeden Amero
d431104926 ssl_tls: Enable Suite B with subset of ECP curves
Make sure the code compiles even if some curves are not defined.

Fixes #1591
2019-06-20 10:59:05 +01:00
Jaeden Amero
2de07f1dd1 ssl: Don't access non-existent encrypt_then_mac field
When MBEDTLS_SSL_ENCRYPT_THEN_MAC is enabled, but not
MBEDTLS_SSL_SOME_MODES_USE_MAC, mbedtls_ssl_derive_keys() and
build_transforms() will attempt to use a non-existent `encrypt_then_mac`
field in the ssl_transform.

    Compile [ 93.7%]: ssl_tls.c
    [Error] ssl_tls.c@865,14: 'mbedtls_ssl_transform {aka struct mbedtls_ssl_transform}' ha
s no member named 'encrypt_then_mac'
    [ERROR] ./mbed-os/features/mbedtls/src/ssl_tls.c: In function 'mbedtls_ssl_derive_keys'
:
    ./mbed-os/features/mbedtls/src/ssl_tls.c:865:14: error: 'mbedtls_ssl_transform {aka str
uct mbedtls_ssl_transform}' has no member named 'encrypt_then_mac'
         transform->encrypt_then_mac = session->encrypt_then_mac;
                  ^~

Change mbedtls_ssl_derive_keys() and build_transforms() to only access
`encrypt_then_mac` if `encrypt_then_mac` is actually present.

Add a regression test to detect when we have regressions with
configurations that do not include any MAC ciphersuites.

Fixes d56ed2491b ("Reduce size of `ssl_transform` if no MAC ciphersuite is enabled")
2019-06-05 14:09:29 +01:00
Hanno Becker
e8d6afd627 Add debug line witnessing receipt of unexpected CID 2019-06-03 16:07:50 +01:00
Hanno Becker
92d30f5bcf Fix indentation in debug message in ssl_tls.c 2019-06-03 16:07:50 +01:00
Hanno Becker
8e55b0f852 Improve comment in ssl_parse_record_header() 2019-06-03 16:07:50 +01:00
Hanno Becker
615ef17b67 Allow passing NULL pointers to mbedtls_ssl_get_peer_cid()
This commit modifies mbedtls_ssl_get_peer_cid() to also allow passing
NULL pointers in the arguments for the peer's CID value and length, in
case this information is needed.

For example, some users might only be interested in whether the use of
the CID was negotiated, in which case both CID value and length pointers
can be set to NULL. Other users might only be interested in confirming
that the use of CID was negotiated and the peer chose the empty CID,
in which case the CID value pointer only would be set to NULL.
It doesn't make sense to pass a NULL pointer for the CID length but a
non-NULL pointer for the CID value, as the caller has no way of telling
the length of the returned CID - and this case is therefore forbidden.
2019-06-03 16:07:50 +01:00
Hanno Becker
a0e20d04b2 Rename MBEDTLS_SSL_CID to MBEDTLS_SSL_DTLS_CONNECTION_ID
Files modified via

sed -i 's/MBEDTLS_SSL_CID\([^_]\|$\)/MBEDTLS_SSL_DTLS_CONNECTION_ID\1/g' **/*.c **/*.h **/*.sh **/*.function
2019-06-03 16:07:50 +01:00
Hanno Becker
d1f203557f Slightly reorder CID debug messages during creation of transforms 2019-06-03 16:07:50 +01:00
Hanno Becker
611ac77127 Fix mbedtls_ssl_conf_cid() to not depend on macro constant values
The previous implementation of mbedtls_ssl_conf_cid() relied on
MBEDTLS_SSL_UNEXPECTED_CID_IGNORE being defined as 1.
2019-06-03 16:07:50 +01:00
Hanno Becker
5d12467fad Remove warnings about unfinished CID implementation
The implementation is complete now.
2019-06-03 16:07:50 +01:00
Hanno Becker
8367ccc03b Allow to configure the stack's behaviour on unexpected CIDs
This commit modifies the CID configuration API mbedtls_ssl_conf_cid_len()
to allow the configuration of the stack's behaviour when receiving an
encrypted DTLS record with unexpected CID.
2019-06-03 16:07:50 +01:00
Hanno Becker
b9ec44fcf6 Remove restriction on value of MBEDTLS_SSL_CID_PADDING_GRANULARITY 2019-06-03 16:07:50 +01:00
Hanno Becker
2cdc5c3cf9 Make signed to unsigned integer truncation cast explicit 2019-06-03 16:07:50 +01:00
Hanno Becker
b1aa1b3616 Allow the configuration of padding when using CID extension 2019-06-03 16:07:50 +01:00
Hanno Becker
4c3eb7c919 Set CID pointer to default value even for TLS
There are two options:
1. Don't set it, and don't use it during record protection,
   guarding the respective paths by a check whether TLS or
   DTLS is used.
2. Set it to the default value even for TLS, and avoid the
   protocol-dependent branch during record protection.

This commit picks option 2.
2019-06-03 16:07:50 +01:00