2024-04

1. Install bash completion extension package# dnf -y install bash-completion# reboot2. Disabling SELinuxFirst, disable selinux.　selinux is a feature that improves auditing and security in Linux, but when enabled, it can limit the behavior of services and the contents of the configuration considerably.Therefore, it is basically a case of invalidation in many cases.SELinux operating modesEnforcing : SELinux functionality is enabled and access control is enabledPermissive : SElinux will warn, but no access restrictions will be placeddisabled : Both SElinux function and access control are

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 changesThe SSH service configuration file is "/etc/ssh/sshd_config".2. Firewall (Firewalld) settingsIn Oracle, the firewall is firewalld configured by default and enabled during OS installation.To briefly explain "firewalld," when setting communication control policies, communication permission/blocking rules are applied to predefined zones, and these zones are then assigned to each NIC (network adapter).3. Remote connection from WindowsConfiguration in WindowsStart the setup for remote connection from Windows, using "Tera Term" as the terminal emulator.Start Tera Term, cancel the startup screen, and then select "New Connection" from "File" in the Tera Term menu.

SSH connection with authentication using public key Creation of public and private key pairsCreate a public/private key pair for a user connecting to the Linux server using OpenSSH.Use ssh-keygen to create key pairs.Creation of public/private key pairs is performed with remote login user 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.

1. FTP Server1.1 Vsftpd Install# dnf -y install vsftpd1.2 Vsftpd configurationSave vsftpd.conf with .bak# cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak2. vsftpd SSL/TLSConfigure Vsftpd to use SSL/TLS2.1 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 Edit

1.Apache2 Install1.1 httpd Install# dnf -y install httpd1.3 Virtual Host SettingsAssign and configure the domain name [FQDN] to the document root [/var/www/html/[FQDN]] directory for virtual host operation2. Confirmation of CGI Script Usage①Confirmation of CGI availability3. PHP installation and configuration①Install# dnf -y install php php-mbstring php-pear4. 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.