RHCE Lab2: Installing and configuring FTP server

A. Installing FTP server

#yum install vsftpd

#rpm -qa|grep -i vsftpd

#rpm -ql vsftpd

/etc/logrotate.d/vsftpd.log
/etc/pam.d/vsftpd
/etc/rc.d/init.d/vsftpd
/etc/vsftpd
/etc/vsftpd/ftpusers
/etc/vsftpd/user_list
/etc/vsftpd/vsftpd.conf
/etc/vsftpd/vsftpd_conf_migrate.sh
/usr/sbin/vsftpd
/usr/share/doc/vsftpd-2.0.5/*
/usr/share/man/man5/vsftpd.conf.5.gz
/usr/share/man/man8/vsftpd.8.gz
/var/ftp
/var/ftp/pub

B. Allow anonymous upload files

Task: allow anonymous upload file to incoming/, but could NOT download or list files from the directory.

#mkdir -p /var/ftp/incoming

#chown root.ftp /var/ftp/incoming

#chmod 730 /var/ftp/incoming

#ls -ld /var/ftp/incoming/
drwx-wx--- 2 root ftp 4096 Nov 1 03:34 /var/ftp/incoming/

Note: this results that ftp group users can ONLY upload(write) to the incoming/ folder, but could NOT list the contents of this directory or even download from it.

#vi /etc/vsftpd/vsftpd.conf

anonymous_enable=YES    # By default, YES

anon_upload_enable=YES    # Allowanonymous to upload files (by default NO)

chown_uploads=YES    # Allowed to change owner of the uploaded files from "ftp" or "anonymous" to other users

chown_username=daemon    # Change owner of the uploaded file to "daemon"

anon_umask=077    # i.e. the uploaded files with permission of 600 ( rw-------); in other means, anonymous user can NOT upload the same file twice

#service vsftpd restart

C. Testing

On FTP server:

#touch /var/ftp/incoming/server.download-incoming

#touch /var/ftp/pub/server.download-pub

On FTP client:

#touch client.upload

#ftp 192.168.75.10

Name:ftp (or anonymous)

Password: (empty)

ftp>pwd

257 "/"

* Change-rooted directory: /var/ftp

ftp>ls

drwx-wx---    2 0        50           4096 Dec 10 05:06 incoming
drwxr-xr-x    2 0        0            4096 Dec 10 05:09 pub

ftp>cd incoming

ftp>pwd

257 "/incoming"

ftp>ls

150 Here comes the directory listing.
226 Transfer done (but failed to open directory).

* Could NOT list contents of this folder.

ftp>put client.upload

150 Ok to send data.
226 File receive OK.

* Upload successfully to incoming/.

ftp>put client.upload

553 Could not create file.

* Could NOT upload the same file twice in incoming/.

ftp>get server.download-incoming

ftp>get client.upload

550 Failed to open file.

* Could NOT download files from incoming/, even the files uploaded by the anonymous user itself.

ftp>cd ..

ftp>cd pub

ftp>pwd

257 "/pub"

ftp>ls

150 Here comes the directory listing.
-rw-r--r--    1 0        0               0 Dec 10 05:19 server.download-pub

226 Directory send OK.

* Can list contents of pub/

ftp>put client.upload

553 Could not create file.

* Could NOT upload file to pub/

ftp>get server.download-pub

226 File send OK.

* Can download file from pub/