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server key encoding depends to the negotiated key exchange. Before
the encoding was limited to diffie-hellman keys. This changes allows
to select the key structure to decode and verify. It also consolidates
the transport encoding of the parameters into one place.
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ssl_handshake and ssl_connection where doing essentially the same when
checking a public key signature. This unify both into a single function
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SHA-224 is still better than SHA-1, so let the world know we support it
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Types in a record where wrongly type specified, did not include
undefined. Make them comments for now, maybe we will specify internal
records with dialyzer types later, but as the other record fields are
not specified at the moment, with dialyzer types, make the code
consistent.
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more "sense" (be true to the specification).
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* http://technotes.googlecode.com/git/nextprotoneg.html
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utf8 and close down gracefully if other ASN-1 errors occur.
The reason certificate_unknown that is used as ALERT for ASN-1 encoding failure is described as:
Some other (unspecified) issue arose in processing the
certificate, rendering it unacceptable.
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with TLS 1.2 the hash and signature on a certify message can
differ from the defaults. So we have to make sure to always
use the hash and signature algorithm indicated in the
handshake message
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combinations
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This is also avoids triggering some bugs in OpenSSL.
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TLS 1.2 introduces changes on how signatures
are calculate and encoded. This makes the
signature handling version aware
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TLS 1.2 allows to negotiate the used PRF,
additional the default PRF uses a different
hash. This change make the PRF selectable
and hardwires the PRF for TLS < 1.2
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TLS 1.2 changes the layout of several handshake
records. This adds the TLS version to dec_hs/2
so it can decode those.
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TLS 1.2 changed the way digital signatures are
done. key_exchange/3 needs to pass the version
to it.
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TLS/SSL version before 1.2 always used a MD5/SHA combination
for the handshake hashes. With TLS 1.2 the default hash is
SHA256 and it is possible to negotiate a different hash.
This change delays the calculation of the handshake
hashes until they are really needed. At that point the hash
to use should be known.
For now MD5/SHA is still hard coded.
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Only use ssl_manager for selecting new ids to guarantee uniqueness,
but reuse check does not need to be performed by the manager.
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Do not use ssl_manager process for selecting an id. It's unnecessary
to involve the manager process at all on the client side.
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transport layer need to generate additional application specific
key material. One way to generate such material is to use the TLS
PRF and key material from the TLS session itself.
This change makes it possible to use a TLS sessions PRF either with
the session internal or caller supplied key material to generate
additional key material.
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Background from erlang-questions:
> We use this test suite to verify our PKIX-path-validation code,
> granted we do not yet support CRL-handling but that is on its
> way. Our verify_fun will let you work around the problem that it
> is not yet supported. (Not so fun for you perhaps but a possible
> solution for now).
this is unfortunately not the case since for versions that contain
commit 4dbf3c9e4ae7cfd19b247353369166d31b8f15e5 (it is in R14B04 and
R15B) the documented behaviour (verify_fun will be called for every
certificate) is broken: the verify_fun will only be called, if the
certificate contains unknown extensions.
it is therefore not useful as a CRL workaround (anymore).
best regards
Stefan Grundmann
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The code is refactored and improved to make it easier to insert the
1/n-1 splitting countermeasure Rizzo/Duong-Beast that is really done
in one function clause in ssl:record_split_bin/3
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ets:next needs an explicit safe_fixtable call to be safe, we
rather use ets:foldl and throw to get out of it when we find the
correct entry.
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implementations to ignore data following the ClientHello (i.e.,
extensions) if they do not understand them.
Data not following the protocol format for extensions will be
ignored by the last dec_hello_extensions-clause.
OTP-8596
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* ia/ssl/use-inet-and-gen-specs:
Use inet and gen_* dialyzer specs
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We want the certificate table to be handled the same way as the
session table and not have a global name, so that we may easier
create a separate ssl-manager to handle erlang distribution over ssl.
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When a verify fun is supplied, it should not be called to verify
the extended_key_usage-extension when it is already verified
by the ssl_certificate:validate_extension/2
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Data to sign and verify should be inputed as binaries.
Also cleaned up and moved some dialyzer specs.
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Also changed alert to BAD_RECORD_MAC as:
"differentiating between bad_record_mac and decryption_failed alerts
may permit certain attacks against CBC mode as used in TLS
[CBCATT]. It is preferable to uniformly use the bad_record_mac
alert to hide the specific type of the error."
Also cleaned up the code and changed a few other alert reasons in
according to alert descriptions in the TLS RFC 4346. And added function
terminate_alert/3 so that we can differentiate between a crash
in ssl (a bug in our code) and a crash in the application using ssl.
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* ia/ssl/certificate-verify/wrong-key-method/OTP-8897:
Correct handling of client certificate verify message
Conflicts:
lib/ssl/src/ssl_handshake.erl
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When checking the client certificate verify message the server used
the wrong algorithm identifier to determine the signing algorithm,
causing a function clause error in the public_key application when the
key-exchange algorithm and the public key algorithm of the client
certificate happen to differ.
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For testing purposes ssl now also support some anonymous cipher suites
when explicitly configured to do so.
Also moved session cache tests to its own suite, so that timeout
of end_per_testcase when the mnesia is used as session cache will
not affect other test cases.
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* ia/ssl-and-public_key/backwards-compatibility/OTP-8858:
Backwards compatibility
Conflicts:
lib/ssl/src/ssl_certificate_db.erl
Use short INFO-message. Debugging information can be fairly
easily recreated so we do not want to clutter the logs.
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Changed implementation to retain backwards compatibility for old
option {verify, 0} that shall be equivalent to {verify, verify_none},
also separate the cases unknown CA and selfsigned peer cert, and
restored return value of deprecated function public_key:pem_to_der/1.
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Changed the behavior of the verify_fun option so that
the application can be responsible for handling path validation
errors even on the server side. Also replaced the not yet
documented validate_extensions_fun to be handled by the
verify_fun instead.
If the verify callback fun returns {fail, Reason}, the verification process is
immediately stopped and an alert is sent to the peer and the TLS/SSL
handshake is terminated. If the verify callback fun returns {valid,
UserState}, the verification process is continued. If the verify callback
fun always returns {valid, UserState}, the TLS/SSL handshake will not be
terminated with respect to verification failures and the connection
will be established. The verify callback fun will also be
able to verify application specific extensions.
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