Linux 23rd day: Exercises and assignments

Linux 23rd day: Exercises and assignments

CD. SSH
Cat Known_hosts Public Key
Cd/etc/ssh
Cat Ssh_host_rsa_key Private Key

Md5sum F1 F2 F3 Digest data same as md5sum hash value

Sha512sum F1

Md5sum F1 > F1.md5
Md5sum--check F1.MD5
F1:ok
Echo >> F1
Md5sum--check F1.MD5
F1:failed

OpenSSL enc-e-des3-a-salt-in fstab-out fstab.des3
RM fstab-f
Cat Fstab.des3
OpenSSL enc-d-des3-a-salt-in fstab-out fstab
Man ENC not man OpenSSL

OpenSSL dgst-md5 Fstab
Md5sum Fstab
(Umask 066;openssl genrsa-out root.key-des 2048)

OpenSSL rsa-in root.key-pubout-out root.key.pub
Cat Root.key.pub

Vim/etc/pki/tls/openssl.cnf
Rpm-qf/etc/pki/tls/openssl.cnf
Ls/etc/pki/ca
Touch/etc/pki/ca/index.txt
echo >/etc/pki/ca/serial
Cd/etc/pki/ca
Ls
(Umask 066;openssl genrsa-out PRIVATE/CAKEY.PEM 2048) Generate private key
CD private/
Cat Cakey.pem
OpenSSL Req-new-x509-key cakey.pem-days 365-out/etc/pki/ca/cacert.pem
OpenSSL x509-in Cacert.pem-noout-text
OpenSSL x509-in cacert.pem-noout-dates
OpenSSL x509-in Cacert.pem-noout-subject
OpenSSL x509-in Cacert.pem-noout-issuer

(Umask 066;openssl genrsa-out/etc/pki/tls/private/httpd.key 2048) Generate private key
Cd/etc/pki/tls/private
Cat Httpd.key
OpenSSL req-new-key/etc/httpd/ssl/httpd.key-days 365-OUT/ETC/HTTPD/SSL/HTTPD.CSR
SCP HTTPD.CSR 10.1.2.252.213:
OpenSSL ca-in httpd.csr-out certs/httpd.crt
Vi/etc/pki/tls/openssl.cnf
Cat Index.txt
Cat serial
OpenSSL x509-in Httpd.crt-noout-text

OpenSSL Ca-revoke Httpd.crt
echo >/etc/pki/ca/crlnumber
OpenSSL ca-gencrl-out/etc/pki/ca/crl/ca.crl
OpenSSL crl-in Cat Crl/ca.crl-noout-text

Gpg-c fstab Symmetric encryption
SCP FSTAB.GPG 10.1.252.213
gpg-d Fstab Symmetric decryption
Gpg-o fstab-d FSTAB.GPG

GPG--gen-key
CD. gnupg/
Ls
ll
GPG--list-key View Public key
Gpg-a--export-o wang.pub
Cat Wang.pub
SCP wang.pub 10.1.252.213:
GPG--list-key
GPG--gen-key
GPG--import wang.pub
GPG-E-R Wang F1
ll F1.GPG
SCP f1.gpg 10.1.252.210:
Gpg-d F1.GPG
Gpg-o f1-d F1.GPG
GPG--delete-secret-keys magedu
CD. gnupg/
ll
GPG--delete-keys Wang

Rpm-q OpenSSH Server
IP addr Add 10.1.252.210/16 dev eth0

Cat Known_hosts

Vim/etc/ssh/sshd_config
Port 22222
Systemctl Restart sshd
Ss-ntl
Tail/var/log/messages
Semanage port-a-T port_type-p TCP 22222 version 7 change 6 no change

Vim/etc/ssh/ssh_config Client without D
Port 22222

Ssh-x?.?.?.? Add x to run the graphics window
System-config-users either INIT3 or 5 windows

Ssh-t 10.1.252.210 ssh 10.1.253.1 forced pseudo terminal-T
Netstat-nt

Ssh-keygen
Cat Id_rsa
Cat Id_rsa.pub

Ssh-copy-id-i. Sh/id_rsa 10.1.252.213

Cat. Ssh/id_rsa.pub
Cat. Ssh/authorized_keys

SCP id_rsa* 10.1.253.1:/root/.ssh

Ssh-keygen-p Plus Password

Ssh-agent Bash Agent
Ssh-add
Ssh-add graphical interface without proxy

cat/root/id_rsa_1024\ \ (2\). Pub >> Authorized_keys import public key

SCP identity.pub 10.1.252.210:
Cat Authorized_keys
Ssh-keygen-i-F identity.pub >>. Ssh/authorized_keys

SCP F1 10.1.252.213

DD If=/dev/zero of=f1 bs=1m count=500
CD. SSH
Ls
Cat known_hosts host public key from/etc/ssh/ssh_host_rsa_key.pub
Cat Authorized_keys user public key from Ssh-keygen per user home directory generation

CP F1 F2
CP F1 F3
Scp-p F1 F2 F3 10.1.252.213:/testdir
CD. SSH
RM-RF *
Cd
Scp-p F1 F2 F3 10.1.252.213:/testdir
Echo >> F1
ll
Scp-p F1 F2 F3 10.1.252.213:/testdir

Rsync-av F1 F2 F3 10.1.252.213:/testdir only update not copy

SFTP 10.1.252.213
Put Fstab
Get 51clickup.sh

Systemctl Start Telnet.socket
Ss-ntl
Iptable-f

Telnet 10.1.252.213

Netstat-ntl

Netstat-nt

Ssh-l 9527:10.1.252.213:23-n 10.1.252.210

Telnet 127.0.0.1 9527

Linux 23rd day: Exercises and assignments