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Public key1.Create a key pair with RSABecome an ordinary user and create a key pair with RSA2.Private Key Login Settings3.Change to login only with private key# vi /etc/ssh/sshd_config●Per line 694.Creating a private key using PuTTYgenLaunch Winscp and start puttygen.exe from Tools

FTP Server Installation1. Install vsftpdDownload vsftpd-3.0.3-33.el8.x86_64.rpm from the download site to /usr/local/src/.# cd /usr/local/src/# wget ftp://ftp.pbone.net/mirror/ftp.centos.org/8-stream/AppStream/x86_64/os/Packages/vsftpd-3.0.3-33.el8.x86_64.rpm# rpm -ivh vsftpd-3.0.3-33.el8.x86_64.rpm2.Configuring vsftpd

Installa apache2 and virtual host configuration1.Install apa...

Install clamav (anti-virus software)1.Install Clam AntiVirus...

Install  SNORT1.Preliminary preparations①Add the CodeReady R...

Install  Mysql8＃ dnf module -y install mysql:8.0＃ vi /etc/my.cnf.d/charset.cnfCreate a new "charset.cnf" with the following contents[mysqld]character-set-server = utf8mb4[client]default-character-set = utf8mb4

1.Obtain SSL Certificate ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel

Web configuration file (under html) backup①Create a backup script file under html# cd /var/www/system/# vi html_backup.shContents of html_backup.sh#!/bin/bash#Date processing (save 10 days)TODAY=`/bin/date +%Y%m%d`DAY_AGO=`/bin/date --date '10day ago' +%Y%m%d`

MiracleLinuxMIRACLE LINUX is a Japanese Linux distribution provided by Cybertrust Corporation.Development was started by Miracle Linux (now Cybertrust), a company established by Oracle Japan and NEC in June 2000 to ensure stable operation of the Oracle Database for business to enterprise use.It has been built as a RHEL base since Version 2.0 released in May 2001, and as a complete RHEL clone since Version 6.0 released in January 2012.The latest version is 8.8, released on October 05, 2023, but can be installed just like 8.4.MIRACLE LINUX, a well-known domestic RHEL clone, was initially a commercial OS with a paid license, but following the demise of CnetOS8, it was announced that it would be offered free of charge starting with the latest 8.4 version. Therefore, this OS is currently in the limelight as a candidate for migration from CentOS8.

1. Disable SELinuxFirst, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it places considerable restrictions on the behavior of services and on what can be configured. Therefore, it is basically disabled in many cases. If you build a server while browsing a website and it does not work as expected, it may be due to the fact that selinux is enabled. Therefore, do not forget to disable it after installation.You can disable it by doing the following

1.Setting up a remote connection via SSHSSH is a service for connecting remotely to a server and is basically running immediately after the OS is installed, but the default settings are somewhat insecure.Here we will configure the default settings to increase the security of ssh connections.1.1 SSH service configuration file changesModify the configuration file to change the SSH service settings.The SSH service configuration file is "/etc/ssh/sshd_config".

SSH public key cipher setting1.Create a key pairCreate a public/private key pair for a user connecting to a Linux server using OpenSSH.Use ssh-keygen to create the key pair.The creation of a public/private key pair must be done as a user with remote login privileges.If you do not specify the destination and file name, id_ed25519 and id_ed25519.pub will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.

2. Vsftpd over SSL/TLSLS2.1 Create self-signed certificatesThis work is not required if you are using a trusted, legitimate certificate such as Let's Encrypt.3. File server installation with SambaBuild a file server with access rights that requires user authentication with Samba.Installation Procedure①Create shared folders with access rights that require user authentication②Accessible group creation③Creation of users belonging to accessible groups④Configuration File Editing

1.Apache2 Install , Virtual Host Configuration1.1 Apache2 install2. Use of CGI Scripts①CGI availability check3. PHP installation and configuration4. Digest authentication with Apache2Since Basic Authentication, a well-known authentication authorization method for http, sends authentication information in plain text, there is a risk of ID and password leakage if the packet is intercepted.On the other hand, Digest Authentication encrypts and transmits authentication information, so there is almost no risk of information leakage.

Clamav (anti-virus software)Install1.Clam AntiVirus InstallMail Server Install1. Postfix1.1 InstallInstall Postfix and build an SMTP serverMail Server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of e-mails①Amavisd ,Clamav Server install