We have an Ubuntu 10.04 server. How can I set it so that new files created (or copied) over SFTP or SSH have g+rw and g+rwx permissions (where appropriate)?
I'm also using setgid (chmod g+s) so that they inherit the proper group owner.
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In /etc/ssh/sshd_config, you can pass a flag and value in (-u 0002) like the following to set the umask value:
Subsystem sftp /usr/lib/openssh/sftp-server -u 0002
Append the -u 0002 to the existing Subsystem sftp line of the configuration file.
Afterwards, you will need to restart ssh for the changes to take effect:
service ssh restart
In /etc/ssh/sshd_config, change the following:
Subsystem sftp /usr/lib/openssh/sftp-server
Subsystem sftp /bin/sh -c 'umask 0002; exec /usr/libexec/openssh/sftp-server'