SELinux Lösungen

Verlegen eines SSH-Ports

• grep “^Port” /etc/ssh/sshd_config

Port 9922

• grep “set allowed_tcp_dports” –after-context=3 /etc/nftables/main.nft

set allowed_tcp_dports {
    type inet_service
    elements = { ssh, 9090, 9922 }
}

• systemctl restart nftables
• semanage port -a -p tcp 9922 -t ssh_port_t
• systemctl restart sshd
• systemctl status sshd

● sshd.service - OpenSSH server daemon
     Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; preset: enabled)
     Active: active (running) since Thu 2023-01-12 15:11:46 CET; 2s ago
       Docs: man:sshd(8)
             man:sshd_config(5)
   Main PID: 13188 (sshd)
      Tasks: 1 (limit: 2311)
     Memory: 1.3M
        CPU: 10ms
     CGroup: /system.slice/sshd.service
             └─13188 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"

Jan 12 15:11:46 fedora systemd[1]: Starting sshd.service - OpenSSH server daemon...
Jan 12 15:11:46 fedora sshd[13188]: Server listening on 0.0.0.0 port 9922.
Jan 12 15:11:46 fedora sshd[13188]: Server listening on :: port 9922.
Jan 12 15:11:46 fedora systemd[1]: Started sshd.service - OpenSSH server daemon.

• grep “set allowed_tcp_dports” –after-context=3 /etc/nftables/main.nft

set allowed_tcp_dports {
    type inet_service
    elements = { ssh, 9090, 80 }
}

• systemctl restart nftables
• mkdir -p /web/html
• cd /etc/httpd/conf
• cp httpd.conf{,.orig}
• sed ‘s/var/www/web/g’ httpd.conf.orig > httpd.conf
• systemctl start httpd
• semanage fcontext -a -t httpd_sys_content_t "/web(/.*)?"
• restorecon -R /web
• ls -dlZ /web
• curl localhost/test

Hello, world!