Date: Thu, 8 Oct 2020 08:29:39 -0500 (CDT) From: Bob Friesenhahn <bfriesen@...ple.dallas.tx.us> To: oss-security@...ts.openwall.com Subject: Re: Debian FEATURE: /home/loser is with permissions 755, default umask 0022 On Thu, 8 Oct 2020, Seth Arnold wrote: > On Wed, Oct 07, 2020 at 04:09:59PM -0500, Bob Friesenhahn wrote: >> Ubuntu Linux (a Debian derivative) has changed the default. However, we >> found that the Ubuntu default caused problems for us while building our >> software, and so we changed them back. > > Hello Bob, can you please share some details on this? > > I expect Ubuntu home directories to be 755 by default: > https://wiki.ubuntu.com/SecurityTeam/Policies#Permissive_Home_Directory_Access > > And while it is very difficult to say "the umask", given that every > process's umask setting depends upon the actions of not only itself but > also its nearest parent to use the umask(2) syscall, but: > > $ grep ^UMASK /etc/login.defs > UMASK 022 It seems that the issue we encountered is due to 'USERGROUPS_ENAB yes' in /etc/login.defs. I am not sure if this is specific to Ubuntu. This setting changes the umask from the default: # Enable setting of the umask group bits to be the same as owner bits # (examples: 022 -> 002, 077 -> 007) for non-root users, if the uid is # the same as gid, and username is the same as the primary group name. # # If set to yes, userdel will remove the user's group if it contains no # more members, and useradd will create by default a group with the name # of the user. # USERGROUPS_ENAB yes Bob -- Bob Friesenhahn bfriesen@...ple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt
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