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You can enable anonymous FTP by setting the anonymous_enable option to YES. The anonymous FTP mode is vsftpd s default mode; thus, YES is the default setting for this option. In anonymous FTP mode only the users anonymous and ftp can log onto the FTP server. When either of these users log in, they will be prompted for a password. vsftpd will accept any text
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as a password when in anonymous mode. It is usually assumed a remote user will enter an e-mail address as this password. You can control this password to some extent using the deny_email_enable and secure_email_list_enable options. The deny_email_enable option allows you to specify a list of passwords (including both e-mail addresses and other passwords) that if used to log in will result in a login failure. You enable this option like this: deny_email_enable=YES By default this list of passwords is stored in the file /etc/vsftpd.banned_emails. You may need to create this file. One of the possible uses of this option is to stop automatic FTP-scanning tools. Many of these tools attempt to log into your server using a default password. You can specify the default passwords these tools use in the /etc/vsftpd.banned_emails file to prevent the tools from logging in.3 In Listing 10-7 you can see the result of trying to log in with a banned password. For this example I have added the password bob@anotherdomain.com to the /etc/vsftpd.banned_emails file. Listing 10-7. Banned Anonymous Passwords kitten# ftp puppy Connected to puppy (192.168.0.1). 220 Welcome to Puppy FTP service. Name (puppy:bob): anonymous 331 Please specify the password. Password: bob@anotherdomain.com 530 Login incorrect. Login failed.
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s You can use the banned_email_file option to override the file used by the deny_email_enable Tip
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option with a different file.
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The secure_email_list_enable option allows you to specify a list of passwords that will be accepted for anonymous login. No other passwords will be accepted. This is not overly secure, as these passwords are stored in plain text. These are not as secure as traditional passwords, and you should use this as a low-security restriction only. You can specify this option like this: secure_email_list_enable=YES By default these passwords are specified in the /etc/vsftpd.email_passwords file. You may need to create this file. You can also override this default file using the email_password_file option like this: email_password_file=/etc/accepted_passwords
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Grim s Ping (http://grimsping.cjb.net/) is an example of a tool that could be misused for FTP scanning and that can be stopped with this option.
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Once the ftp or anonymous user is logged into your anonymous FTP server, the user will have access only to the contents of the home directory of the ftp user. I showed how to create this user and specify their home directory as part of the vsftpd installation process in the Installing vsftpd section. In that section I used the /var/ftp directory. If you want to enable local user mode, which allows local users contained in the /etc/passwd file to log into the FTP server, you should set the local_enable option to YES. I will talk about that option in the Configuring vsftpd with Local Users section. The first of the access rights options, the write_enable option, specifies whether FTP commands that are capable of writing to the file system are enabled. This includes FTP commands such as STOR or DELE.4 By default this option is set to NO. This means no files can be written to, renamed, or deleted from your system. The vsftpd.conf man file contains a full list of the commands this option disables. The second access right I have specified, cmds_allowed, controls the FTP commands that you are able to run on your FTP server. This is a powerful tool for locking down your FTP server to a limited number of FTP commands. Listing 10-6 specifies that only the commands PASV, RETR, and QUIT are allowed to run on the server. This means users can only download files and exit the server. With a limited number of FTP commands enabled, you can quite tightly secure your FTP server.
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