I'm running vsftpd and have a specific question:
The file_open_mode and local_umask options let me configure, what permissions a newly created file/folder should have.
The problem:
I want 0660 for new files but 0770 for new folders (All files and folders should be readable and writable by owner and group - folders need the executable bit so that it's possible to open them)
How can I configure that?
(I searched this forum, google, vsftpd.man page, tutorials, manuals..)
The default file_open_mode of 0666 and local_umask of 0007 will give you file permissions of 0660 and directory permissions of 0770.
As you already pointed out, files are created with the permissions set in file_open_mode (modified by the local_umask). Therefore, to get files created with 0660 you can keep the default file_open_mode and modify it with a local_umask of 0007 to get 0660 as the result.
Directories are created with mode 0777 modified by the local_umask. The only supporting documentation I found about this is in the source code itself. As there is no official browser-readable source code available, I can only link to an unofficial source code mirror at https://github.com/dagwieers/vsftpd/blob/3.0.2/postlogin.c#L1179 where the "tunable umask" in the comment refers to the local_umask configuration.
/* NOTE! Actual permissions will be governed by the tunable umask */
retval = str_mkdir(&p_sess->ftp_arg_str, 0777);
