Setting up Virtual user with VSFTPD with Different Permissions

If you want to  setup a virtual user with  VSFTPD and also want to  share the same directory across multiple users then you can refer the below simple steps to achieve this :

  • Install VSFTPD  server
yum install vsftpd
  • Open the /etc/vsftpd/vsftpd.conf file and add the below contents :
anonymous_enable=NO
 local_enable=YES
 chroot_local_user=YES
 user_config_dir=/etc/vsftpd/vsftpd-virtual-user/
 virtual_use_local_privs=YES
 dual_log_enable=YES
 connect_from_port_20=YES
 listen=YES
 pam_service_name=vsftpd
 local_root=/home/share-drive
 tcp_wrappers=YES
 pasv_enable=YES
 pasv_max_port=55000
 pasv_min_port=50000
 pasv_address=10.10.10.14
 local_umask=0002

save and quit

Here pasv_address=10.10.10.14 is explicitly used to map the nat IP  to  public IP for passive port

  • Now go  to  directory /etc/vsftpd/vsftpd-virtual-user/ and create the file :: vsftpd_user
    cd /etc/vsftpd/vsftpd-virtual-user/

    Note :: You need to  create the directory : /etc/vsftpd/vsftpd-virtual-user/ if it doesn’t exist

  • In vsftpd_user file add the usernames for which you want to set per user  configuration
[email protected]~[#] cat vsftpd_user
test
test1
  • Now create the usernames file as ::
[email protected]~[#] cat test
 local_root=/home/share-drive
cmds_allowed=USER,PASS,SYST,FEAT,OPTS,PWD,TYPE,PASV,LIST,STOR,CWD,MKD,SIZE,MDTM,CDUP,RETR,RNFR,RNTO
 hide_file={*.xml}
 deny_file={*.xml}
 file_open_mode=0666
 local_umask=0002
 write_enable=YES

Here, deny_file will limit the access to specific files and folders for user test and same will be used for hiding the files

To use the benefit of share/common directory add the users as ::

First create a group called :  ftp_users

then add the users as ::

useradd -d /home/share-drive -s /sbin/nologin username

Once done that, use the command usermod -G ftp_users test this will facilitates all the files and folders creation with test:ftp_users .

To  add new user use :
 useradd -d /home/share-drive -s /sbin/nologin -g  ftp-users test1

Finally,  restart the VSFTPD service and you are done.

 

all FTP commands and save it on the system for reference:

#
# List of FTP commands
#
# ABOR - Abort an active file transfer.
# ACCT - Account information.
# ADAT - Authentication/Security Data (RFC 2228)
# ALLO - Allocate sufficient disk space to receive a file.
# APPE - Append.
# AUTH - Authentication/Security Mechanism (RFC 2228)
# CCC  - Clear Command Channel (RFC 2228)
# CDUP - Change to Parent Directory.
# CONF - Confidentiality Protection Command (RFC 697)
# CWD  - Change working directory.
# DELE - Delete file.
# ENC  - Privacy Protected Channel (RFC 2228)
# EPRT - Specifies an extended address and port to which the server should connect. (RFC 2428)
# EPSV - Enter extended passive mode. (RFC 2428)
# FEAT - Get the feature list implemented by the server. (RFC 2389)
# HELP - Returns usage documentation on a command if specified, else a general help document is returned.
# LAND - Language Negotiation (RFC 2640)
# LIST - Returns information of a file or directory if specified, else information of the current working directory is returned.
# LPRT - Specifies a long address and port to which the server should connect. (RFC 1639)
# LPSV - Enter long passive mode. (RFC 1639)
# MDTM - Return the last-modified time of a specified file. (RFC 3659)
# MIC  - Integrity Protected Command (RFC 2228)
# MKD  - Make directory.
# MLST - Lists the contents of a directory if a directory is named. (RFC 3659)
# MODE - Sets the transfer mode (Stream, Block, or Compressed).
# NLST - Returns a list of file names in a specified directory.
# NOOP - No operation (dummy packet; used mostly on keepalives).
# OPTS - Select options for a feature. (RFC 2389)
# PASS - Authentication password.
# PASV - Enter passive mode.
# PBSZ - Protection Buffer Size (RFC 2228)
# PORT - Specifies an address and port to which the server should connect.
# PWD  - Print working directory. Returns the current directory of the host.
# QUIT - Disconnect.
# REIN - Re initializes the connection.
# REST - Restart transfer from the specified point.
# RETR - Retrieve (download) a remote file.
# RMD  - Remove a directory.
# RNFR - Rename from.
# RNTO - Rename to.
# SITE - Sends site specific commands to remote server.
# SIZE - Return the size of a file. (RFC 3659)
# SMNT - Mount file structure.
# STAT - Returns the current status.
# STOR - Store (upload) a file.
# STOU - Store file uniquely.
# STRU - Set file transfer structure.
# SYST - Return system type.
# TYPE - Sets the transfer mode (ASCII/Binary).
# USER - Authentication username.

Encrypting MySQLDump

If  you are looking to Encrypt your MySQL database dump for security reasons than you can  use the ccrypt tool  to encrypt your dump.sql file.

Follow the below simple steps to  achieve the database dump encryption and decryption :

  1. Create a  encryption key file as /root/.backup_keyfile and add the password/key in  that file
  2. This keyfile  will be used to  encrypt and decrypt the data [dump.sql file]

Now,  that we have created the encryption  file we just need to  execute the below commands :

      mysqldump --opt  opsview |  ccrypt  -k /root/.encryptkeyfile > opsview.sql

Capture

This will encrypt the opsview.sql file and to  decrypt the opsview.sql file use :

[[email protected] ~]# cat opsview.sql | ccrypt -d -k /root/.backup_keyfile > opsview1.sql

Capture

This will  decrypt the opsview.sql file, easy  isn’t it 😀