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As per RFC 4492 Sec 5.1, the preferred order of selection of named
curves is based on client preferences.
Currently, the SSL application only picks entries according to the
absolute order of entries as tracked in a hardcoded list in code.
This patch changes things so that the client-specified order is
preferred. It also allows a mode where the server can be configured to
override the client's preferred order with its own, although the chosen
ECC must still be within both lists.
The configuration is done through the following options:
- `eccs`, shared by clients and servers alike, allows the specification
of the supported named curves, in their preferred order, and may
eventually support more values for explicit primes and so on.
- `honor_ecc_order`, a server-only option, is similar to
`honor_cipher_order` and will, by default let the server pick the
client-preferred ECC, and otherwise pick the server-preferred one.
The default value for `eccs` is the same as before, although the
server-chosen ECC now defaults to the client rather than previous
choice.
A function `ssl:eccs()` has been added that returns the highest
supported ECCs for the library.
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* henrik/update-copyrightyear:
update copyright-year
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In TLS-1.2 The signature algorithm and the hash function algorithm
used to produce the digest that is used when creating the digital signature
may be negotiated through the signature algorithm extension RFC 5246.
We want to make these algorithm pairs configurable.
In connections using lower versions of TLS these algorithms are
implicit defined and can not be negotiated or configured.
DTLS is updated to not cause dialyzer errors, but needs to get a real
implementation later.
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DES is not considered secure.
Also correct 'Server Name Indication' support description.
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algorithms
With the addition of more ciphers that are not supported in all
configurations, using a manually prefiltered cipher list (e.g. EC vs.
non-EC ciphers) becomes to complex. Replace the manual split with
ssl_cipher:filter_suites/1 in all places.
Conflicts:
lib/ssl/src/ssl.erl
lib/ssl/src/tls_v1.erl
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Conflicts:
lib/ssl/src/dtls_record.erl
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crashing.
When TLS client sends Supported Elliptic Curves Client Hello Extension
the server shall select a curve supported by both sides or refuse to
negotiate the use of an ECC cipher suite.
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Newer OpenSSL versions allow to selectively disable GF2m elliptic curves.
Selectively enable GF2m curves is support for them is available.
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Also refactor so that TLS and DTLS can have common functions when possible.
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