restrict file download not upload

[utpalsarkar]

hi everybody,

How cud i stop downloading files from FTP and allow uploading files in FTP.

Thanks & reg,

[MikeTbob]

You need to be more specific please, are you running an FTP server or something? What exactly are you attempting to do here?

[utpalsarkar]

hi Mike,

Thanks 4 response.

In my ftp I want 2 allow any user or particular user to upload the file but don't want to allow download the files.

Is it possible ? plz help me.

Thanks,

[blinky]

Don't know is any FTPD does that. Your going to have to view the situation as a learning experience/opportunity, Download the source for vsftpd or other and disable the mget and get command(s), should be realitively easy.

[utpalsarkar]

actually i faced this question in an interview

regards,

[utpalsarkar]

i have one more question i.e.
I want to restrict file upload/download size in ftp. i.e. file more thank 10mb could not be uploaded or downloaded also. If this is possible, please let me know.

Thanks & regards,

[l4ever]

You can use the <Limit> directive for this in the FTP configuration file :
-----------------------------------------------------------
<Directory /path/to/uploads>
<Limit ALL>
DenyAll
</Limit>

<Limit CDUP CWD XCWD XCUP>
AllowAll
</Limit>

<Limit STOR STOU>
AllowAll
</Limit>
</Directory>
---------------------------------------------------------
The first <Limit ALL> section blocks use of all FTP commands within the /path/to/uploads directory. Having denied use of all commands, we then proceed to define which commands can be used. The CDUP and CWD commands (and their X variants) should be allowed so that clients can change into and out of the directory. Next, STOR and STOU are allowed, so that clients can actually upload files into the directory (assuming that the filesystem permissions allow for the client to write files in the directory as well). The WRITE command group might have been used, but that also allows things like creating and deleting subdirectories, which is usually not wanted in an upload-only configuration.

Reference : ProFTPD mini-HOWTO - Configuring <Limits>

[l4ever]

Well, u didnt specify what FTP server you are running..

[utpalsarkar]

Its vsftp is running on my server.

Thanks,

[blinky]

Try playing with anon_umask and local_umask (eg make all the uploaded files non-readable ie premissions = 0000), the directory can be RW but the server should change the premissions after an upload so files are never readable. Never tried it but that looks like a logical use of the anon_umask and local_umask parameters.

See man vsftpd.conf