openssh supports forcing exact permissions on uploaded files
With this update, OpenSSH can force exact permissions on files that are newly uploaded using the Secure File Transfer Protocol (SFTP).
Created attachment 990048 [details]
Description of problem:
Currently when setting up a shared sftp upload space between multiple users/logins, you can force a proper umask with the -u switch. This requires
that the file at the origin has wide-permissions to start with. In some
cases, users are not skilled enough to set the permissions to be correct (sigh).
While this could be solved via file/dir ACLs, it is also not entirely trivial
in most environments.
A simple solution would be to add a force_file_perm option to sftp
which could be used for this.
I shall attach a patch that was taken from https://bugzilla.mindrot.org/show_bug.cgi?id=1844 and massaged it for RHEL 6.7
I smoke-tested it and it works as expected. I.e. setting the following:
Match User testrpm
ForceCommand internal-sftp -m 777
Gives all files created via sftp by user testrpm of 777
I chose the simplest one to cover this specific use case, but anything that
covers this, will do (i.e. we could expand it to cover folders as well, if
it makes sense)
I think what has been NACKed a long time ago via BZ 859238 was much bigger
in scope, hence this BZ
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.