O modo security = share foi preterido desde o Samba 3.6 e foi removido do código do Samba em fevereiro de 2012 ( commit d7bb961859a350 ):
s3-auth: Remove security=share (depricated since 3.6). This patch removes security=share, which Samba implemented by matching the per-share password provided by the client in the Tree Connect with a selection of usernames supplied by the client, the smb.conf or guessed from the environment. The rationale for the removal is that for the bulk of security=share users, we just we need a very simple way to run a 'trust the network' Samba server, where users mark shares as guest ok. This is still supported, and the smb.conf options are documented at https://wiki.samba.org/index.php/Public_Samba_Server At the same time, this closes the door on one of the most arcane areas of Samba authentication.