This commit changes the behaviour of mbedtls_ssl_parse_certificate
to make the two authentication modes SSL_VERIFY_REQUIRED and
SSL_VERIFY_OPTIONAL be in the following relationship:
Mode == SSL_VERIFY_REQUIRED
<=> Mode == SSL_VERIFY_OPTIONAL + check verify result
Also, it changes the behaviour to perform the certificate chain
verification even if the trusted CA chain is empty. Previously, the
function failed in this case, even when using optional verification,
which was brought up in #864.
This commit changes `ssl_parse_signature_algorithms_ext` to remember
one suitable ( := supported by client and by our config ) hash
algorithm per signature algorithm.
It also modifies the ciphersuite checking function
`ssl_ciphersuite_match` to refuse a suite if there
is no suitable hash algorithm.
Finally, it adds the corresponding entry to the ChangeLog.
In a USENIX WOOT '16 paper the authors warn about a security risk
of random Initialisation Vectors (IV) repeating values.
The MBEDTLS_SSL_AEAD_RANDOM_IV feature is affected by this risk and
it isn't compliant with RFC5116. Furthermore, strictly speaking it
is a different cipher suite from the TLS (RFC5246) point of view.
Removing the MBEDTLS_SSL_AEAD_RANDOM_IV feature to resolve the above
problems.
Hanno Böck, Aaron Zauner, Sean Devlin, Juraj Somorovsky and Philipp
Jovanovic, "Nonce-Disrespecting Adversaries: Practical Forgery Attacks
on GCM in TLS", USENIX WOOT '16
* mbedtls-1.3:
Add ChangeLog entry for previous commit
cert_write : fix "Destination buffer is too small" error
Add ChangeLog entry for previous two commits
Test certificate "Server1 SHA1, key_usage" reissued.
Fix boolean values according to DER specs
Fix typo in an OID name
Disable reportedly broken assembly of Sparc(64)
ECHDE-PSK does not use a certificate
Actually ignore most non-fatal alerts
Not a security issue as here we know the buffer is large enough (unless
something else if badly wrong in the code), and the value cast to int is less
than 2^16 (again, unless issues elsewhere).
Still changing to a more correct check as a matter of principle
backport of bc5e508
* rasp/mem-leak:
Fix another potential memory leak found by find-mem-leak.cocci.
Add a rule for another type of memory leak to find-mem-leak.cocci.
Fix a potential memory leak found by find-mem-leak.cocci.
Add a semantic patch to find potential memory leaks.
Fix whitespace of 369e6c20.
Apply the semantic patch rm-malloc-cast.cocci.
Add a semantic patch to remove casts of malloc.
Conflicts:
programs/ssl/ssl_server2.c
Rationale: if people want to disable RC4 but otherwise keep the default suite
list, it was cumbersome. Also, since it uses a global array,
ssl_list_ciphersuite() is not a convenient place. So the SSL modules look like
the best place, even if it means temporarily adding one SSL setting.
Reading the documentation of ssl_set_truncated_hmac() may give the impression
I changed the default for clients but I didn't, the old documentation was
wrong.
