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authorIngela Anderton Andin <ingela@erlang.org>2015-02-25 12:11:16 +0100
committerIngela Anderton Andin <ingela@erlang.org>2015-03-02 15:00:46 +0100
commited540bd0e457fd43a5b3eaf41f9886cb63a2755a (patch)
treec01969146c2b7db293724e0fa24d7a6f27966741 /lib/ssl/doc
parent2032d22f69ffa8ce6c3ded5d2e2a6ff34b3b5980 (diff)
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ssl: Implement support for TLS_FALLBACK_SCSV
Diffstat (limited to 'lib/ssl/doc')
-rw-r--r--lib/ssl/doc/src/ssl.xml17
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml
index 249fee5760..0c042f8571 100644
--- a/lib/ssl/doc/src/ssl.xml
+++ b/lib/ssl/doc/src/ssl.xml
@@ -425,6 +425,23 @@ fun(srp, Username :: string(), UserState :: term()) ->
Indication extension will be sent if possible, this option may also be
used to disable that behavior.</p>
</item>
+ <tag>{fallback, boolean()}</tag>
+ <item>
+ <p> Send special cipher suite TLS_FALLBACK_SCSV to avoid undesired TLS version downgrade.
+ Defaults to false</p>
+ <warning><p>Note this option is not needed in normal TLS usage and should not be used
+ to implement new clients. But legacy clients that that retries connections in the following manner</p>
+
+ <p><c> ssl:connect(Host, Port, [...{versions, ['tlsv2', 'tlsv1.1', 'tlsv1', 'sslv3']}])</c></p>
+ <p><c> ssl:connect(Host, Port, [...{versions, [tlsv1.1', 'tlsv1', 'sslv3']}, {fallback, true}])</c></p>
+ <p><c> ssl:connect(Host, Port, [...{versions, ['tlsv1', 'sslv3']}, {fallback, true}]) </c></p>
+ <p><c> ssl:connect(Host, Port, [...{versions, ['sslv3']}, {fallback, true}]) </c></p>
+
+ <p>may use it to avoid undesired TLS version downgrade. Note that TLS_FALLBACK_SCSV must also
+ be supported by the server for the prevention to work.
+ </p></warning>
+ </item>
+
</taglist>
</section>