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When making an SSL connection (either as client or as server), the
process implementing the connection may use as much as hundreds of
kilobytes of memory, even when idle. This is problematic for any
application maintaining more than just a few SSL connections.
This patch introduces the option { hibernate_after, int() } to the
ssl:connect and ssl:listen functions, making the SSL connection
process go into hibernation after the specified number of milliseconds
of inactivity. This will reduce the memory used by the process to
just a few hundred bytes, making applications with thousands or
more SSL connections feasible, as long as most of the connections
are idle for most of the time (which is typically the case).
The approach of making the process go into hibernation only after
some time of inactivity was chosen because hibernation incurs some
CPU usage, and it is therefore not desirable for a process to
hibernate after each call.
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ssl's published documentation states:
ssl_accept(ListenSocket) ->
ssl_accept(ListenSocket, Timeout) -> ok | {error, Reason}
(see http://www.erlang.org/doc/man/ssl.html#ssl_accept-1)
while its code has the specs:
-spec ssl_accept(#sslsocket{}) -> {ok, #sslsocket{}} | {error, reason()}.
-spec ssl_accept(#sslsocket{}, list() | timeout()) -> {ok, #sslsocket{}} | {error, reason()}.
One of the two cannot be right. This should be fixed.
Moreover, I do not see why the spec just mentions list() for the options when the documentation explicitly mentions the options of ssl.
Kostis
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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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maint-r14
* ia/ssl-and-public_key/verify_fun_peer_awarness/OTP-8873:
Peer awarness
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Changed the verify fun so that it differentiate between the peer
certificate and CA certificates by using valid_peer or valid as the
second argument to the verify fun. It may not always be trivial or
even possible to know when the peer certificate is reached otherwise.
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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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Added the functionality so that the verification fun will be called
when a certificate is considered valid by the path validation to allow
access to eachs certificate in the path to the user application.
Removed clause that only check that a extension is not critical,
it does alter the verification rusult only withholds information from
the application.
Try to verify subject-AltName, if unable to verify it let
application try.
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Started to improve code documentation by using -spec directive, and
some small refactorings to avoid ugly code.
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Ssl has now switched default implementation and removed deprecated
certificate handling. All certificate handling is done by the public_key
application.
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