Chapter 19 ftp transferring files across a network
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Chapter 19 FTP: Transferring Files Across a Network. FTP Client JumpStart: Downloading Files Using fip Notes Anonymous FTP Automatic Login Binary versus ASCII Transfer Mode ftp Specifics FTP Server (vsftpd) JumpStart: Starting a vsftpd Server Testing the Setup

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Chapter 19 FTP: Transferring Files Across a Network

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Chapter 19 ftp transferring files across a network

Chapter 19 FTP: Transferring Files Across a Network

  • FTP Client

  • JumpStart: Downloading Files Using fip Notes

  • Anonymous FTP

  • Automatic Login

  • Binary versus ASCII Transfer Mode

  • ftp Specifics

  • FTP Server (vsftpd)

  • JumpStart: Starting a vsftpd Server

  • Testing the Setup

  • vsftpd.conf: Configuring vsftpd


Introduction

Introduction

  • ftp has been around as one of the original TCP/IP protocols

  • ftp and vsftpd – this chapter will focus more on vsftpd since it is provided with Fedora

  • Security – vsftp is secure, ftp is not

  • Connections – passive is client initiated connection, active is if server initiates


Ftp client

FTP Client

  • ftp – command line, Linux or Windows

  • sftp – secure ftp, part of OpenSSH

  • gftp – graphical ftp, supports ftp, SSH, and HTTP

  • ncftp – Fedora text-based utility with more features than standard ftp


Standard ftp screen

Standard ftp screen


Chapter 19 ftp transferring files across a network

gFTP


Ncftp

NcFTP


Umpstart downloading files using ftp

]umpStart: Downloading Files Using ftp

  • Basic commands:

    • ftp ftp.server.net

    • ftp> open ftp.server.net

    • ftp> user

    • ftp> get (mget)

    • ftp> put (mput)

    • ftp> prompt

    • ftp> hash

    • ftp> ascii or binary

    • ftp> cd and lcd

    • ftp> quit or bye


Anonymous ftp

Anonymous FTP

  • Can use user id of either

    • anonymous or

    • ftp (some systems)

  • Enter email address as password if necessary, see automatic login below

  • ftp server can use reverse DNS to verify


Automatic login

Automatic Login

  • Place ~/.netrc file in your home directory to allow automatic login:

    $ cat .netrc

    machine bravo login jimbo password xyz123

  • Make readable only by owner!

  • Can defeat at ftp server config file


Binary versus ascii transfer mode

Binary versus ASCII Transfer Mode

  • Binary mode (default for some systems) provides a byte by byte exact transfer

  • ASCII (ascii) mode converts end of line characters between Windows and Unix systems

    • Can also use dos2unix or unix2dos

    • Security – always use binary mode


Ftp specifics

ftp Specifics

  • Format – ftp [-options] server

  • Options:

    • -i interactive

    • -g globbing, file name expansion with wild cards

    • -v verbose

    • -n no automatic login with .netrc


Ftp commands

ftp commands

  • Shell command = !command (!ls)

  • Transfer files:

    • append local remote

    • get remote-file [new local file name]

    • mget remote-file-list [wild cards allowed]

    • put local-file [new remote file name]

    • mput remote-file-list [wild cards allowed]

    • newer remote-file [new local file name]

    • reget remote-file [new local file name]


Status

status

  • ascii – sets transfer mode to ASCII

  • binary – sets transfer mode to binary

  • close – quits ftp server without leaving ftp

  • open [server name] – opens new ftp connection

  • hash – shows hash marks (#) during transfers

  • prompt – toggles prompts for transfers

  • passive – toggles between passive and active

  • user – sign in as different user

  • quit or bye – exits ftp site and closes ftp


Directories

Directories

  • cd - changes directories on ftp server/site

  • lcd – changes local directories on your machine

  • Do not use ftp> ! cd newdirectory

  • Remember that the environment does not change in a spawned process!


Files

Files

  • chmod – to change permissions on files

  • delete – to delete remote file(s) if allowed

  • mdelete remote-file-list


Display information

Display Information

  • dir – like ls but has file option:

    • dir [remote-dir] file

    • (file saved on your local system with contents of the remote directory listing)

  • ls – same as dir but with more information

  • help – shows commands

  • pwd – print working remote directory

  • status – status information

  • verbose – to see all that is happening


Ftp server vsftpd

FTP Server (vsftpd)

  • The vsftpd package is installed by default on Red Hat systems

  • Modes:

    • Standalone – set listen parameter to “yes” in vsftpd.conf file

    • Normal – use xinetd superserver to start and stop, set to normal by default


Jumpstart starting a vsftpd server

JumpStart: Starting a vsftpd Server

  • Make sure service is running:

    # /sbin/service vsftpd status

    vsftpd (pid 3022) is running . . .

  • Check permissions in /var/ftp directory

    # ls –ld /var/ftp

    drwxr-xr-x 4 root root 4096 Aug 12 /var/ftp


Vsftpd connection from localhost

vsftpd connection from localhost


Vsftpd connection from remote host

vsftpd connection from remote host


Vsftpd conf configuring vsftpd

vsftpd.conf: Configuring vsftpd

  • Standalone – listen=yes

  • listen_port (default 21)

  • listen_address – defaults to any network interface

  • max_clients – set to 0 for unlimited

  • max_per_ip – set to 0 for any IP address allowed


Logging in

Logging in

  • userlist_enable – yes further checks userlist_deny, no does not check the list, more secure is no

  • userlist_deny – list of users denied access

  • userlist_file – name of user list file

  • local_enable – allows users in /etc/passwd file to log onto system


Anonymous users

Anonymous Users

  • anonymous_enable – yes allows anonymous

  • no_anon_password – yes won’t ask for password

  • deny_email_enable – yes checks if email password

    user is denied access to system

  • banned_email_file – list of denied users by email

    address


Working directories and chroot jail

Working Directories and chroot jail

  • chroot_list_enable – sets user in jail either in their home directory or in /var/ftp

  • chroot_local_user – if set to no local user can move around directory structure

  • chroot_list_file – naem of the file if chroot_list_file is set to yes

  • passwd_chroot_enable – allows local user to cd to home directory (/home/./jones)

  • secure_chroot_dir – empty directory that is not writeable by user ftp, a secure chroot jail


Messages

Messages

  • dirmessage_enable – yes displays .message

  • banner_file – file that is displayed at login, overrides ftpd_banner

  • ftpd_banner – overrides the standard vsftpd greeting banner at connection time

  • And speaking of banners:


Any questions

Any Questions?


  • Login