Bug 1817557

._samba_ rebased to version 4.12.3 The _samba_ packages have been upgraded to upstream version 4.12.3, which provides a number of bug fixes and enhancements over the previous version: * Built-in cryptography functions have been replaced with GnuTLS functions. This improves the server message block version 3 (SMB3) performance and copy speed significantly. * The minimum runtime support is now Python 3.5. * The `write cache size` parameter has been removed because the previous write cache concept could reduce the performance on memory-constrained systems. * Support for authenticating connections using Kerberos tickets with DES encryption types has been removed. * The `vfs_netatalk` virtual file system (VFS) module has been removed. * The `ldap ssl ads` parameter is marked as deprecated and will be removed in a future Samba version. For information about how to alternatively encrypt LDAP traffic and further details, see the link:https://access.redhat.com/solutions/5325651[samba: removal of "ldap ssl ads" smb.conf option] solution. * By default, Samba on RHEL 8.3 no longer supports the deprecated RC4 cipher suite. If you run Samba as a domain member in an AD that still requires RC4 for Kerberos authentication, use the `update-crypto-policies --set DEFAULT:AD-SUPPORT` command to enable support for the RC4 encryption type. Samba automatically updates its `tdb` database files when the `smbd`, `nmbd`, or `winbind` service starts. Back up the database files before starting Samba. Note that Red Hat does not support downgrading `tdb` database files. For further information about notable changes, read the link:https://www.samba.org/samba/history/samba-4.12.0.html[upstream release notes] before updating.