Enable file transfer using ftp is not difficult task in linux system. After ftp server application installed, then check it: for example in slackware, $ ls /var/log/packages/ | grep ftpd proftpd-1.3.3e-i486-1 vsftpd-2.3.4-i486-1 After we make sure this application installed in the system, the first step is modify the file configuration. In this article i am choose proftpd, because it quite easy to configure. Using your favorite text editor, edit file /etc/proftpd.conf, modify the "servername" and "servertype". ServerName "WAR49 FTP Server" ServerType standalone And then, save it and run ftp server application (with root previleges). root@darkstar:~# proftpd root@darkstar:~# ps -ef | grep ftp nobody 2878 1 0 21:37 ? 00:00:00 proftpd: (accepting connections) root 2882 2669 0 21:37 pts/1 00:00:00 grep ftp Untill this step, the server is ready for accepting connections. But we can also make user for this ftp activity. root@darkstar:~# groupadd planet root@darkstar:~# useradd -G planet -d /export/home/earth -s /bin/bash earth root@darkstar:~# useradd -G planet -d /export/home/venus -s /bin/bash venus Command like useradd is not automatically create the home directory for user, useradd command just update contents of /etc/passwd file. So you must create it manually and give permission to the directory. root@darkstar:~# mkdir /export/home/{earth,venus} root@darkstar:~# chown -R earth:planet /export/home/earth/ root@darkstar:~# chown -R venus:planet /export/home/venus Both earth or venus directory has created. Then, giving user password for them.
root@darkstar:~# passwd earth
Changing password for earth Enter the new password (minimum of 5 characters) Please use a combination of upper and lower case letters and numbers. New password: Re-enter new password: passwd: password changed. root@darkstar:~# passwd venus Changing password for venus Enter the new password (minimum of 5 characters) Please use a combination of upper and lower case letters and numbers. New password: Re-enter new password: passwd: password changed. Trying access to ftp server.
wardi@darkstar:~$ id uid=1000(wardi) gid=1000(wardi) groups=1000(wardi) wardi@darkstar:~$ ftp 192.168.2.103 Connected to 192.168.2.103. 220 ProFTPD 1.3.3e Server (WAR49 FTP Server) [192.168.2.103] Name (192.168.2.103:wardi): earth 331 Password required for earth Password: 230 User earth logged in Remote system type is UNIX. Using binary mode to transfer files. ftp> pwd 257 "/export/home/earth" is the current directory ftp> bye 221 Goodbye. Untill this step, the ftp connection was succeed. Then, we have a scenario like this: Path /share is owned by user earth in group planet, this path (/share) want to be shared to user venus. So, in this case, user venus can read the path, only read. When user venus login into ftp server, the default directory is /export/home/venus. In this default directory would be create a symbolic link (shortcut) to /share that owned by user earth. So, by clicked this shortcut, user venus can access the /share directory. As root user create /share directory and given to user earth. root@darkstar:~# mkdir /share && chown -R earth:planet /share root@darkstar:~# ls -l / | grep share drwxr-xr-x 2 earth planet 4096 Feb 26 22:28 share /share directory has 'rwx' permission for owner (earth) and has 'r-x' permission for group (planet). So, in this case, user venus is in the same group as user earth. So user venus has read permission to this directory. Then (as venus), go on to venus home directory, and make symbolic link (shortcut) to /share directory. venus@darkstar:~$ ln -s /share the_share venus@darkstar:~$ ls -l total 0 lrwxrwxrwx 1 venus venus 6 Feb 26 22:34 the_share -> /share Then, Check in FTP connection and login with venus user.
wardi@darkstar:~$ ftp 192.168.2.103 Connected to 192.168.2.103. 220 ProFTPD 1.3.3e Server (WAR49 FTP Server) [192.168.2.103] Name (192.168.2.103:wardi): venus 331 Password required for venus Password: 230 User venus logged in Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 200 PORT command successful 150 Opening ASCII mode data connection for file list lrwxrwxrwx 1 venus venus 6 Feb 26 15:34 the_share -> /share 226 Transfer complete Then, go to the shortcut that would take you to /share directory. ftp> cd the_share 250 CWD command successful ftp> pwd 257 "/share" is the current directory ftp> ls 200 PORT command successful 150 Opening ASCII mode data connection for file list -rw-r--r-- 1 earth earth 0 Feb 26 15:42 earth_data1.txt -rw-r--r-- 1 earth earth 0 Feb 26 15:42 earth_data2.txt 226 Transfer complete Then, get all file .txt in the /share directory to local system. ftp> lcd ~/ Local directory now /home/wardi ftp> mget *.txt mget earth_data1.txt? y 200 PORT command successful 150 Opening BINARY mode data connection for earth_data1.txt 226 Transfer complete mget earth_data2.txt? y 200 PORT command successful 150 Opening BINARY mode data connection for earth_data2.txt 226 Transfer complete ftp> bye 221 Goodbye. Check on the local system to ensure that those file are downloaded perfectly. wardi@darkstar:~$ ls *.txt earth_data1.txt earth_data2.txt User earth can upload anything file to the /share directory due to /share directory has owned by user earth by ftp command. wardi@darkstar:~$ ls font* font font2 wardi@darkstar:~$ ftp 192.168.2.103 Connected to 192.168.2.103. 220 ProFTPD 1.3.3e Server (WAR49 FTP Server) [192.168.2.103] Name (192.168.2.103:wardi): earth 331 Password required for earth Password: 230 User earth logged in Remote system type is UNIX. Using binary mode to transfer files. ftp> cd /share 250 CWD command successful ftp> pwd 257 "/share" is the current directory ftp> mput font* mput font? y 200 PORT command successful 150 Opening BINARY mode data connection for font 226 Transfer complete 176138 bytes sent in 0.0358 secs (4.8e+03 Kbytes/sec) mput font2? y 200 PORT command successful 150 Opening BINARY mode data connection for font2 226 Transfer complete 89634 bytes sent in 0.0725 secs (1.2e+03 Kbytes/sec) Check uploaded file in /share directory in server. ftp> ls 200 PORT command successful 150 Opening ASCII mode data connection for file list -rw-r--r-- 1 earth earth 0 Feb 26 15:42 earth_data1.txt -rw-r--r-- 1 earth earth 0 Feb 26 15:42 earth_data2.txt -rw-r--r-- 1 earth earth 176138 Feb 26 15:51 font -rw-r--r-- 1 earth earth 89634 Feb 26 15:51 font2 226 Transfer complete ftp> bye 221 Goodbye.
