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Authconfig cleanup
Fedora 26 is not shipping the Coolkey PKCS#11 module in the NSS database by default. Instead, there will be the OpenSC PKCS#11 module, which supports more different Smart Cards. The Coolkey package will be removed in Fedora 27. If other applications were using Coolkey, they should be able to switch to OpenSC.
From Fedora 26, a new SSSD "files" provider will resolve users from the local files. That way, the "sss" NSS module can be configured before the files module in nsswitch.conf and the system can leverage sss_nss caching for both local and remote users. As a result, user and group resolution in Fedora will be much faster.
In case you still need Coolkey in the NSS DB, you can add it manually using [command]`modutil -dbdir /etc/pki/nssdb -add "CoolKey PKCS #11 Module (manual)" -libfile -force` (the different name is used to prevent automatic removals when updating coolkey package).
Java Crypto
Obsolete and unmaintainable code was removed from [command]`authconfig`. Notably:
OpenJDK has been modified to read additional security properties from the generated crypto policies file at `/etc/crypto-policies/back-ends/java.config`
OpenSC Replaces Coolkey
OpenSSH clients will use system preferred key exchange algorithms, encryption ciphers, and message authentication code (MAC) algorithms. This is enabled by an `Include` directive in `/etc/ssh/ssh_config` to include directives in `/etc/ssh/ssh_config.d/*.conf`, which pulls in `/etc/crypto-policies/back-ends/openssh.config`.
OpenSSH Crypto
OpenSSL 1.1.0
Soon (during F26 cycle) there will be fully-featured 0.17.0 update to OpenSC with all the tested features and cards that should serve as a complete replacement of Coolkey.
SSSD fast cache for local users
SSSD has shipped with a very fast memory cache in the last couple of Fedora releases. However, using this cache conflicts with nscd's caching and nscd has been disabled by default. That degrades performance, because every user or group lookup must open the local files.
System-wide Crypto Policy
The ciphers that an administrator might consider adequately secure are determined by vulnerabilities published against specific ciphers. The acceptable cipher suite applies to all communications on the internet, and is not specific to any one system or daemon. To ease administration and increase adminsitrator confidence in the system's security posture, Fedora has been configuring various software to use a system-global configuration so that TLS ciphers need only be updated in one place.
The command line tool, which has been deprecated previously, continues to be part of the distribution for legacy reasons. However, some deprecated and obsolete functionality such as support for `WINS` and `HESIOD` has been removed in this release.
The graphical interface ([package]*system-config-authentication*) and the interactive text mode, which relied on old and unmaintained libraries (GTK+2 and Glade) have been removed from the distribution.
The introduction of OpenSSL 1.1.0 in Fedora 26 brings many big improvements, new cryptographic algorithms, and API changes that allow for keeping the ABI stable in future upgrades. There is also now a compat-openssl10 package in Fedora that provides OpenSSL 1.0.2 for dependent applications that cannot move to 1.1.0 yet.