* restricted/pr/594:
Adapt baremetal.h and baremetal.sh
Don't incl. CAs in CertReq message in baremetal build
Allow config'n of incl of CertificateReq CA list Y/N at compile-time
Allow configuration of endpoint (cli/srv) at compile-time
Allow configuration of read timeouts at compile-time
Allow configuration of ConnectionID at compile-time
Allow compile-time configuration of legacy renegotiation
Allow compile-time configuration of authentication mode
Allow compile-time configuration of DTLS badmac limit
Allow compile-time configuration of DTLS anti replay
* restricted/pr/601: (27 commits)
Fix compile-time guard for optional field in struct
Move code to reduce probability of conflicts
Fix typos caught by check-names.sh
Clarify conditions related to resumption in client
Introduce getter function for renego_status
Add getter function for handshake->resume
Remove now-redundant code
Remove cache callbacks from config on client
Fix a few style issues
Expand documentation of new options a bit
Fix renaming oversight in documentation
Remove backticks in doxygen in config.h
Declare dependency on tickets for two ssl-opt.sh tests
Exclude new negative options from config.pl full
Restore config.h defaults
Address review comments
Fix ssl_cli resumption guards
Fix check-files, check-names and check-generated-features
Add test to all.sh
Add changelog entry
...
* restricted/pr/584: (140 commits)
Remove superfluous new line in x509.c
Add comment about X.509 name comparison of buffer with itself
[Fixup] Add missing PK release call in Cert Verify parsing
Fix guard controlling whether nested acquire calls are allowed
Add X.509 CRT test for nested calls for CRT frame / PK acquire
Don't return threading error on release()-without-acquire() calls
Don't allow nested CRT acquire()-calls if MBEDTLS_X509_ALWAYS_FLUSH
Make X.509 CRT cache reference counting unconditional
Remove memory buffer alloc from i386 test in all.sh
Don't mention pk_sign() in the context of public-key contexts
Don't use assertion for failures of mbedtls_x509_crt_x_acquire()
Fix copy pasta in x509_crt.h
Reference copy-less versions of X.509 CRT frame/PK getters
x509_crt.c: Add blank line to increase readability
[FIXUP] Fix bug in ASN.1 traversal of silently ignored tag
[FIXUP] Fix typo in declaration of mbedtls_x509_memcasecmp()
Move signature-info extraction out of MBEDTLS_X509_REMOVE_INFO
Fix certificate validity checking logic to work with !TIME_DATE
Simplify X.509 CRT version check in UID parsing
Remove unused variable warning in on-demand X.509 parsing
...
This commit modifies the baremetal configuration to disables the inclusion
of the list of accepted CAs in the CertificateRequest message sent by the
server.
Impact on code-size:
| | GCC 8.2.1 | ARMC5 5.06 | ARMC6 6.12 |
| --- | --- | --- | --- |
| `libmbedtls.a` before | 23099 | 23781 | 26639 |
| `libmbedtls.a` before | 22995 | 23689 | 26515 |
| gain in Bytes | 104 | 92 | 124 |
Introduces MBEDTLS_SSL_CONF_CERT_REQ_CA_LIST which allows to configure
at compile-time whether a CA list should be included in the
CertificateRequest message sent by the server.
Impact on code-size:
| | GCC 8.2.1 | ARMC5 5.06 | ARMC6 6.12 |
| --- | --- | --- | --- |
| `libmbedtls.a` before | 23131 | 23805 | 26673 |
| `libmbedtls.a` after | 23099 | 23781 | 26639 |
| gain in Bytes | 32 | 24 | 34 |
Introduces MBEDTLS_SSL_CONF_BADMAC_LIMIT to fix the maximum
number of records with bad MAC tolerated in DTLS at compile-time.
Impact on code-size:
| | GCC | ARMC5 | ARMC6 |
| --- | --- | --- | --- |
| `libmbedtls.a` before | 23511 | 24049 | 27903 |
| `libmbedtls.a` after | 23487 | 24025 | 27885 |
| gain in Bytes | 24 | 24 | 18 |
mbedtls_ssl_read() can fail non-fatally, in which case
ssl_parse_certificate_verify() returned immediately without
calling mbedtls_x509_crt_pk_release(), which in turn lead
to a fatal error because of nested acquire calls in the
next call to the function.
There are a number of PRs in flight that are going to append to the list of
getter functions for harcodeable SSL conf items, so leave that list at the end
in order to avoid conflicts between this PR and the SSL conf ones.
While not strictly related to this PR, this change improves readability in
some resumption-related runtime conditions that previously had rather ugly
preprocessor directives in the middle of already complex predicates.
Due to previous change of conditions, this is now in the 'else' branch of 'if
resume == 1' and the only allowed values are 0 or 1, so setting to 0 is
redundant.
The session cache is only server-side. This also aligns the conditions
guarding those fields with the condition guarding the function setting them -
no need to have the fields if we can't set them.
This preserves the API and ABI in the default config as it only affects
non-default configs.
Add a new configuration option MBEDTLS_SSL_SESSION_RESUMPTION
to enable/disable the session resumption feature including
ticket and cache based session resumption.
Resource counting as a safe-guard against nested acquire calls
is implemented if and only if MBEDTLS_X509_ALWAYS_FLUSH is disabled
_or_ MBEDTLS_THREADING_C is enabled.
Oz is allowed to make size optimizations that make the code slower,
where Os isn't. Optimize with Oz, as we care more about having a small
code footprint than having fast code.
Previously, a call to mbedtls_x509_crt_xxx_release() would return
MBEDTLS_ERR_THREADING_MUTEX_ERROR if usage counter for the frame/PK
was 0. Now that resource counting can also be used outside of
threading support, this is no longer adequate, and this commit
changes the return code to MBEDTLS_ERR_X509_FATAL_ERROR; while
generic, this at least matches the top-level module.
Forbidding nested calls to acquire() allows to remove the reference
counting logic and hence saving some bytes of code. This is valuable
because MBEDTLS_X509_ALWAYS_FLUSH is likely to be used on constrained
systems where code-size is limited.
Previously, reference counting for the CRT frames and PK contexts
handed out by mbedtls_x509_crt_{frame|pk}_acquire() was implemented
only in case threading support was enabled, which leaves the door
open for a potential use-after-free should a single-threaded application
use nested calls to mbedtls_x509_crt_acquire().
Since Mbed TLS itself does not use such nested calls, it might be
preferred long-term to forbid nesting of acquire calls on the API
level, and hence get rid of reference counting in the interest of
code-size benefits. However, this can be considered as an optimization
of X.509 on demand parsing, and for now this commit introduces
reference counting unconditionally to have a safe version of
on demand parsing to build further optimizations upon.
