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Full Discussion: Forcing UID on Files/Dirs Created with SFTP?
Top Forums UNIX for Dummies Questions & Answers Forcing UID on Files/Dirs Created with SFTP? Post 302199632 by deckard on Tuesday 27th of May 2008 10:23:21 AM
Old 05-27-2008
Forcing UID on Files/Dirs Created with SFTP?
I have a situation where I have to provide Windows based users with access to specific files and directories on a *nix web mail server. The users cannot use the CLI, so SSH is out. They've previously used a product called Webdrive to access *nix boxes via SFTP.

The files and dirs they need read/write access to are have user:group set to an account with an autogenerated and unknown password, so I can't just connect them with the application user's credentials. I also will not give them 'root' access. Instead I created a user account for them and added that account to the application user's group. This allows them to log in and work with limited access, which is fine.

However, the problem that remains is that all files and dirs they create are for their own user:group settings. The end result is that every time they make a change, I have to ssh in and 'chown -R user:group /path/to/appfiles'. In Samba (which we can't use for security reasons) there is a way to force the logged in user to create files as a different user:group as specified by the admin. I was wondering if there was any way to do this with SFTP?
 

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LEARN ABOUT XFREE86

newgrp

NEWGRP(1)                                                          User Commands                                                         NEWGRP(1)

NAME

       newgrp - log in to a new group

SYNOPSIS

       newgrp [-] [group]

DESCRIPTION

       The newgrp command is used to change the current group ID during a login session. If the optional - flag is given, the user's environment
       will be reinitialized as though the user had logged in, otherwise the current environment, including current working directory, remains
       unchanged.

       newgrp changes the current real group ID to the named group, or to the default group listed in /etc/passwd if no group name is given.
       newgrp also tries to add the group to the user groupset. If not root, the user will be prompted for a password if she does not have a
       password (in /etc/shadow if this user has an entry in the shadowed password file, or in /etc/passwd otherwise) and the group does, or if
       the user is not listed as a member and the group has a password. The user will be denied access if the group password is empty and the user
       is not listed as a member.

       If there is an entry for this group in /etc/gshadow, then the list of members and the password of this group will be taken from this file,
       otherwise, the entry in /etc/group is considered.

CONFIGURATION

       The following configuration variables in /etc/login.defs change the behavior of this tool:

       SYSLOG_SG_ENAB (boolean)
           Enable "syslog" logging of sg activity.

FILES

       /etc/passwd
           User account information.

       /etc/shadow
           Secure user account information.

       /etc/group
           Group account information.

       /etc/gshadow
           Secure group account information.

SEE ALSO

       id(1), login(1), su(1), sg(1), gpasswd(1), group(5), gshadow(5).

shadow-utils 4.5                                                    01/25/2018                                                           NEWGRP(1)
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