[SFTP] Possibility for Adding "ForceFilePermission" option

Alexander Wuerstlein snalwuer at cip.informatik.uni-erlangen.de
Fri Dec 15 04:12:12 AEDT 2017

On 2017-12-14T17:28, House Lee <hlee at vendasta.com> wrote:
> Hi,
> I understand that if I specify `ForceCommand internal-sftp -u <umask>`, the permission of any files uploaded via sftp will be calculated by `<original permission> & ~umask`. However, this can be bypassed by the `-P` option of `put` command. We are developing a shared hosting platform, therefore we definitely don’t want our users being able to upload any executable files. We can not disable the x permission by umask because directories need the x permission. 
> Is there any possible way to accomplish this? or is it possible to add a `ForceFilePermission` and `ForceDirPermission` option in the sshd_config ?

Mount the filesystem in question with 'noexec', you probably also want
'nosuid' and 'nodev' anyways.


Alexander Wuerstlein.

More information about the openssh-unix-dev mailing list