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when using --http2 one can now selectively disable NPN or ALPN with
--no-alpn and --no-npn. for now honored with NSS only.
TODO: honor this option with GnuTLS and OpenSSL
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SSL_ENABLE_ALPN can be used for preprocessor ALPN feature detection,
but not SSL_NEXT_PROTO_SELECTED, since it is an enum value and not a
preprocessor macro.
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Add ALPN and NPN support for NSS. This allows cURL to negotiate
HTTP/2.0 connections when built with NSS.
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Offer TLSv1.0 to 1.2 by default, still fall back to SSLv3
if --tlsv1[.N] was not specified on the command line.
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Add ALPN support when using GnuTLS >= 3.2.0. This allows
libcurl to negotiate HTTP/2.0 for https connections when
built with GnuTLS.
See:
http://www.gnutls.org/manual/gnutls.html#Application-Layer-Protocol-Negotiation-_0028ALPN_0029
http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-04
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Add ALPN support when using OpenSSL. This will offer ALPN and NPN to the
server, who can respond with either one or none of the two. OpenSSL >=
1.0.2 is required, which means as of today obtaining a snapshot from
ftp://ftp.openssl.org/snapshot/.
See:
http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-04
https://github.com/openssl/openssl/blob/ba168244a14bbd056e502d7daa04cae4aabe9d0d/ssl/ssl_lib.c#L1787
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For some reason Windows 7 SP1 chooses TLS 1.0 instead of TLS 1.2
if it is not explicitly enabled within grbitEnabledProtocols.
More information can be found on MSDN:
http://msdn.microsoft.com/library/windows/desktop/aa379810.aspx
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NPN is what is available in the wild today to negotiate SPDY or HTTP/2.0
connections. It is expected to be replaced by ALPN in the future. If
HTTP/2.0 is negotiated, this is indicated for the entire connection and
http.c is expected to initialize itself for HTTP/2.0 instead of
HTTP/1.1.
see:
http://technotes.googlecode.com/git/nextprotoneg.html
http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg-04
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It is not provided by NSS public headers.
Bug: https://bugzilla.redhat.com/1058776
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... that the user does not ask for
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Make GnuTLS old and new consistent, specify the desired protocol, cipher
and certificate type in always in both modes. Disable insecure ciphers
as reported by howsmyssl.com. Honor not only --sslv3, but also the
--tlsv1[.N] switches.
Related Bug: http://curl.haxx.se/bug/view.cgi?id=1323
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By default even recent versions of OpenSSL support and accept both
"export strength" ciphers, small-bitsize ciphers as well as downright
deprecated ones.
This change sets a default cipher set that avoids the worst ciphers, and
subsequently makes https://www.howsmyssl.com/a/check no longer grade
curl/OpenSSL connects as 'Bad'.
Bug: http://curl.haxx.se/bug/view.cgi?id=1323
Reported-by: Jeff Hodges
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It turns out errSecDecode wasn't defined in Leopard's headers. So
we use the enum's value instead.
Bug: http://curl.haxx.se/mail/lib-2013-12/0150.html
Reported by: Abram Pousada
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If OpenSSL is built to support SSLv2 this brings back the ability to
explicitly select that as a protocol level.
Reported-by: Steve Holme
Bug: http://curl.haxx.se/mail/lib-2014-01/0013.html
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Some feedback provided by byte_bucket on IRC pointed out that commit
db11750cfa5b1 wasn’t really correct because it allows for “upgrading” to a
newer protocol when it should be only allowing for SSLv3.
This change fixes that.
When SSLv3 connection is forced, don't allow SSL negotiations for newer
versions. Feedback provided by byte_bucket in #curl. This behavior is
also consistent with the other force flags like --tlsv1.1 which doesn't
allow for TLSv1.2 negotiation, etc
Feedback-by: byte_bucket
Bug: http://curl.haxx.se/bug/view.cgi?id=1319
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Since ad34a2d5c87c7f4b14e8dded3 (present in 7.34.0 release) forcing
SSLv3 will always return the error "curl: (35) Unsupported SSL protocol
version" Can be replicated with `curl -I -3 https://www.google.com/`.
This fix simply allows for v3 to be forced.
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