Doan Thanh (Find something to do something)

. Installation of VSFTPD

For Red Hat, CentOS and Fedora, you may install VSFTPD by the command

# yum install vsftpd

For Debian and Ubuntu,

# apt-get install vsftpd

2. Virtual users and authentication

We are going to use pam_userdb to authenticate the virtual users. This needs a username / password file in `db’ format – a common database format. We need `db_load’ program. For CentOS, Fedora, you may install the package `db4-utils’:

# yum install db4-utils

For Ubuntu,

# apt-get install db4.2-util

To create a `db’ format file, first create a plain text file `virtual-users.txt’ with the usernames and passwords on alternating lines:

mary
123456
jack
654321

Then execute the following command to create the actual database:

# db_load -T -t hash -f virtual-users.txt /etc/vsftpd/virtual-users.db

On Ubuntu

# db4.2_load -T -t hash -f virtual-users.txt /etc/vsftpd/virtual-users.db

Now, create a PAM file /etc/pam.d/vsftpd-virtual which uses your database:

auth required pam_userdb.so db=/etc/vsftpd/virtual-users
account required pam_userdb.so db=/etc/vsftpd/virtual-users

3. Configuration of VSFTPD

Create a configuration file /etc/vsftpd/vsftpd-virtual.conf

anonymous_enable=NO
local_enable=YES
guest_enable=YES
virtual_use_local_privs=YES
write_enable=YES
pam_service_name=vsftpd-virtual
user_sub_token=$USER
local_root=/ftpfolder/$USER
force_dot_files=YES
chroot_local_user=YES
hide_ids=YES
listen=YES
listen_port=21
pasv_min_port=62222
pasv_max_port=63333
connect_from_port_20=YES
local_umask=022
tcp_wrappers=YES
accept_timeout=180

4. Creation of home directories

Create each user’s home directory in /ftpfolder, and change the owner of the directory to the user `ftp’:

# mkdir /ftpfolder/mary
# chown ftp:ftp /ftpfolder/mary