FTP传输，生成的文件对Web服务器可见？

Question

My task is to create a folder on a web server and upload a set of images to the new folder. The resulting images should then be visible to anyone with access to the web server. The server is a dedicated Linux AWS instance.

I have the basic folder creation and file transfer working using C# and FtpWebRequest . The FTP server is set to have its local root at /var/www/job_folder and folders and files are correctly created within that root folder. I have created a special user for the purpose of uploading files.

The created folder and files, however, have minimal permissions. The newly created folder is drwx----- while the files within the folder are -rw------ . When I attempt to view these images in a web browser I receive 403 Forbidden .

How can I change my program or alter my folder or user setup such that the folder and files I ftp to the server are immediately visible on the web? I have unrestricted access to the server.

Answer 1

You could set the SETGUID bit on the containing directory and also set the directory's group to that of the web server - that way any files created in there will inherit the group of the web server rather than the group of the creator.

I mean this:

mkdir somedirectory          # create that puppy
chgrp <apache's group>       # set its group to that of apache
chmod g+s somedirectory      # force all files subsequently created there to belong to apache's group

Alternatively, you could do a chmod in FTP after you PUT the files:

ftp someserver
PUT freddyfrog               # upload that puppy
CHMOD 666 freddyfrog         # let everyone see it (and overwrite it - try 444 if overwriting not wanted)