Build vsftp using centos

Source: Internet
Author: User

1. check whether there is any installation.

rpm -qa | grep vsftpd

If no prompt is displayed, the installation is not performed. Next, we will install an FTP.

2. Install vsftpd in Yum:

yum -y install vsftpd

After installation, check the generated configuration file:

[[Email protected] ~] # Ll/etc/vsftpd/total usage 20-rw ------- 1 Root 125 October 18 07:54 ftpusers-RW ------- 1 Root 361 October 18 07:54 user_list-rw ------- 1 Root 4599 October 18 07:54 vsftpd. conf-rwxr -- r -- 1 Root 338 07:54


3. Configure vsftpd:

Let's talk about public FTP browsing anonymously:

Edit vsftpd. conf:

vim /etc/vsftpd/vsftpd.conf

Add a line at the end:


This line specifies the directory of our vsftpd. If our FTP is a public Intranet, restart the service after the configuration is complete:

[[Email protected] FTP] # service vsftpd restart disable vsftpd: [OK] Start vsftpd For vsftpd: [OK]

Then you can browse anonymously in the browser.



Then let's talk about the FTP configuration of sub-permissions:

Edit vsftpd. conf:

# Example config file/etc/vsftpd. conf # the default compiled in settings are fairly paranoid. this sample file # loosens things up a bit, to make the FTP daemon more usable. # Please see vsftpd. CONF.5 for all compiled in defaults. # Read this: this example file is not an exhaustive list of vsftpd options. # Please read the vsftpd. CONF.5 manual page to get a full idea of vsftpd's # capabilities. # Allow Anonymous FTP? (Beware-allowed by default if you comment this out ). anonymous_enable = no # uncomment this to allow local users to log in. local_enable = yes # uncomment this to enable any form of FTP write command. write_enable = yes # default umask for local users is 077. you may wish to change this to 022, # If your users Except CT that (022 is used by most other ftpd's) local_umask = 022 # uncomment this to allow the Anon Ymous FTP user to upload files. this only # has an effect if the above global write enable is activated. also, you will # obviusly need to create a Directory Writable By the FTP user. # anon_upload_enable = yes # uncomment this if you want the anonymous FTP user to be able to create # new directories. # anon_mkdir_write_enable = yes # activate directory messages-messages given to remote users when they # G O into a certain directory. dirmessage_enable = yes # the target log file can be vsftpd_log_file or xferlog_file. # This depends on setting xferlog_std_format parameterxferlog_enable = yesxferlog_file =/main/var/log/vsftpd. log # Make sure port transfer connections originate from Port 20 (ftp-data ). connect_from_port_20 = yes # if you want, you can arrange for uploaded anonymous files to be owned by # A diffe Rent user. Note! Using "root" for uploaded files is not # recommended! # Chown_uploads = yes # chown_username = Whoever # the name of log file when xferlog_enable = yes and xferlog_std_format = yes # warning-changing this filename affects/etc/logrotate. d/vsftpd. log # xferlog_file =/var/log/xferlog # switches between logging into vsftpd_log_file and xferlog_file files. # No writes to vsftpd_log_file, yes to xferlog_filexferlog_std_format = yes # You may change the default value for timing out an idle session. # idle_session_timeout = 600 # You may change the default value for timing out a data connection. # data_connection_timeout = 120 # It is recommended that you define on your system a unique user which the # ftp server can use as a totally isolated and unprivileged user. # nopriv_user = ft1_cure # enable this and the server will recognize asynchronous Abor requests. not # recommended for Security (the code is non-trivial ). not enabling it, # However, may confuse older FTP clients. # async_abor_enable = yes # by default the server will pretend to allow ASCII mode but in fact ignore # the request. turn on the below options to have the server actually do ASCII # mangling on files when in ASCII mode. # Beware that on some FTP servers, ASCII support allows a Denial of Service # attack (DOS) via the command "size/big/file" in ASCII mode. vsftpd # predicted this attack and has always been safe, reporting the size of the # raw file. # ASCII mangling is a horrible feature of the Protocol.Ascii_upload_enable= Yesascii_download_enable =Yes# You may fully customise the login banner string: # ftpd_banner = welcome to blah FTP service. # You may specify a file of disallowed anonymous e-mail addresses. apparently # useful for combatting certain DoS attacks. # deny_email_enable = yes # (default follows) # banned_email_file =/etc/vsftpd/banned_emails # You may specify an explicit list of local users to chroot () to their home # directory. if chroot_loc Al_user is yes, then this list becomes a list of # users to not chroot (). # chroot_local_user = yeschroot_list_enable = yes # (default follows) # chroot_list_file =/etc/vsftpd/chroot_list # You may activate the "-R" option to the builtin ls. this is disabled by # default to avoid remote users being able to cause excessive I/O on large # sites. however, some broken FTP clients such as "ncftp" and "mirror" assum E # the presence of the "-R" option, so there is a strong case for enabling it. # ls_recurse_enable = yes # When "listen" directive is enabled, vsftpd runs in standalone mode and # listens on IPv4 Sockets. this directive cannot be used in conjunction # With the listen_ipv6 direve ve. listen = yes # This Directive enables listening on IPv6 Sockets. to listen on IPv4 and IPv6 # sockets, you must run two copies Of vsftpd with two configuration files. # make sure, that one of the listen options is commented !! # Listen_ipv6 = yespam_service_name = vsftpduserlist_enable = yestcp_wrappers = yes # the row below is manually added # anon_root =/main/var/FTP After configuring sub-user permissions, this directory does not work. guest_enable = yesguest_username = ftpuser_config_dir =/etc/vsftpd/vuser_conf

The configuration above is described as follows:

Anonymous_enable = No: Anonymous Access to local_enable = yes is not allowed. Note: If a virtual host user is used, all virtual users cannot access the project if the project is set to No. Chroot_list_enable = yesxferlog_file =/var/log/vsftpd. Log sets the path for saving vsftpd service logs. Note: This file does not exist by default. You must manually touch ascii_upload_enable = yesascii_download_enable = yes to set the support for uploading and downloading in ASCII mode. Pam_service_name = vsftpd PAM Authentication file name. Pam will authenticate the following based on/etc/PAM. d/vsftpd: important configuration items about vsftpd virtual user support. By default, vsftpd. conf does not contain these configuration items. You need to manually add the configuration. Guest_enable = Yes sets to enable the virtual user function. Guest_username = FTP specifies the host user of the virtual user. -The built-in FTP user user_config_dir =/etc/vsftpd/vuser_conf in centos sets the path for storing the configuration file of the virtual user's personal vsftp. Configuration file for storing virtual user personality (configuration file name = virtual user name)

Then manually create the configured log file:

Touch/main/var/log/vsftpd. log # create a vsftp Log File
Then configure chroot_list:
shell>touch /etc/vsftpd/chroot_listshell>echo ftp >> /etc/vsftpd/chroot_list

If db4 and db4-util are not installed, run:

yum install db4 db4-utils

Create User Password text/etc/vsftpd/vuser_passwd.txt:

The format is one user name and one password (we are going to create two users, one admin user with read and write permissions and the other readuser user with read-only permissions ):


Use the db4-util you just installed to generate a virtual user-authenticated dB File

db_load -T -t hash -f /etc/vsftpd/vuser_passwd.txt /etc/vsftpd/vuser_passwd.db

A file is generated:

-RW-r -- 1 Root 12288 November 4 10:29 vuser_passwd.db

Then edit the authentication file/etc/PAM. d/vsftpd:

Comment out all original statements (For the sake of security, we do not want to authenticate local users. All users use virtual user authentication.), And then add the following two sentences:

auth       required db=/etc/vsftpd/vuser_passwdaccount    required db=/etc/vsftpd/vuser_passwd

Touch, and then Vim virtual user personalized configuration file

vim /etc/vsftpd/vuser_conf/hjbFtpAdmin


# Virtual user admin profile (you can write, upload, and create directories) # virtual user root directory local_root =/main/var/path/to/FTP directory write_enable = yesanon_umask = 022anon_world_readable_only = noanon_upload_enable = yesanon_mkdir_write_enable = Yes

Create another read-only user:

vim /etc/vsftpd/vuser_conf/hjbFtpReadUser


# Virtual user profile configuration file (read-only user readuser, only read, not write, modify, delete) # virtual user root directory local_root =/main/var/path/to/FTP directory write_enable = noanon_umask = 022anon_world_readable_only = yesanon_upload_enable = noanon_mkdir_write_enable = No

Finally, restart the service:

service vsftpd start

When two users log on, the permissions are different.







Build vsftp using centos

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