#6839: nss-3.20
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Reporter: fo | Owner: blfs-book@…
Type: enhancement | Status: new
Priority: normal | Milestone: 7.8
Component: BOOK | Version: SVN
Severity: normal | Keywords:
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[https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_20_RTM/src/nss-3.20.tar.gz]
[https://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_20_RTM/src/SHA256SUMS]
5e38d4b9837ca338af966b97fc91c07f67ad647fb38dc4af3cfd0d84e477d15c
[https://developer.mozilla.org/en-
US/docs/Mozilla/Projects/NSS/NSS_3.20_release_notes]
{{{
NSS 3.20 release notes
by 2 contributors:
kaie m_t
== Introduction ==
The NSS team has released Network Security Services (NSS) 3.20, which is
a minor release.
== Distribution Information ==
The HG tag is NSS_3_20_RTM. NSS 3.20 requires NSPR 4.10.8 or newer.
== New in NSS 3.20 ==
New Functionality
• The TLS library has been extended to support DHE ciphersuites in
server applications.
New Functions
• in ssl.h
◦ SSL_DHEGroupPrefSet - Configure the set of allowed/enabled DHE
group parameters that can be used by NSS for a server socket.
◦ SSL_EnableWeakDHEPrimeGroup - Enable the use of weak DHE group
parameters that are smaller than the library default's minimum
size.
New Types
• in sslt.h
◦ SSLDHEGroupType - Enumerates the set of DHE parameters embedded
in NSS that can be used with function SSL_DHEGroupPrefSet
New Macros
• in ssl.h
◦ SSL_ENABLE_SERVER_DHE - A socket option user to enable or
disable DHE ciphersuites for a server socket
== Notable Changes in NSS 3.20 ==
• The TLS library has been extended to support DHE ciphersuites in
server applications.
• For backwards compatibility reasons, the server side implementation
of the TLS library keeps all DHE ciphersuites disabled by default.
They can be enabled with the new socket option
SSL_ENABLE_SERVER_DHE and the SSL_OptionSet or the
SSL_OptionSetDefault API.
• The server side implementation of the TLS implementation does not
support session tickets when using a DHE ciphersuite (see bug
1174677).
• Support for the following ciphersuites has been added:
◦ TLS_DHE_DSS_WITH_AES_128_GCM_SHA256
◦ TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
◦ TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
• By default, the server side TLS implementation will use DHE
parameters with a size of 2048 bits when using DHE ciphersuites.
• NSS embeds fixed DHE parameters sized 2048, 3072, 4096, 6144 and
8192 bits, which were copied from version 08 of the Internet-Draft
"Negotiated Finite Field Diffie-Hellman Ephemeral Parameters for
TLS", Appendix A.
• A new API SSL_DHEGroupPrefSet has been added to NSS, which allows a
server application to select one or multiple of the embedded DHE
parameters as the preferred parameters. The current implementation
of NSS will always use the first entry in the array that is passed
as a parameter to the SSL_DHEGroupPrefSet API. In future versions
of the TLS implementation, a TLS client might signal a preference
for certain DHE parameters, and the NSS TLS server side
implementation might select a matching entry from the set of
parameters that have been configured as preferred on the server
side.
• NSS optionally supports the use of weak DHE parameters with DHE
ciphersuites to support legacy clients. In order to enable this
support, the new API SSL_EnableWeakDHEPrimeGroup must be used. Each
time this API is called for the first time in a process, a fresh
set of weak DHE parameters will be randomly created, which may take
a long amount of time. Please refer to the comments in the header
file that declares the SSL_EnableWeakDHEPrimeGroup API for
additional details.
• The size of the default PQG parameters used by certutil when
creating DSA keys has been increased to use 2048 bit parameters.
• The selfserv utility has been enhanced to support the new DHE
features.
• NSS no longer supports C compilers that predate the ANSI C standard
(C89).
== Bugs fixed in NSS 3.20 ==
This Bugzilla query returns all the bugs fixed in NSS 3.20:
https://bugzilla.mozilla.org/buglist.cgi?resolution=FIXED&classification=Components&query_format=advanced&product=NSS&target_milestone=3.20
== Compatibility ==
NSS 3.20 shared libraries are backward compatible with all older NSS 3.x
shared libraries. A program linked with older NSS 3.x shared libraries
will work with NSS 3.20 shared libraries without recompiling or
relinking. Furthermore, applications that restrict their use of NSS APIs
to the functions listed in NSS Public Functions will remain compatible
with future versions of the NSS shared libraries.
}}}
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