Cum instalez SSH in Linux?

Am observat ca în ultima vreme am din ce în ce mai multi vizitatori pe forum care cauta asa ceva prin motoarele de cautare si dau de forum-ul meu fara a gasi in realitate o informatie reala si utila.

Nu de putine ori in ultima vreme lumea isi instaleaza linux. Motivele pentru care nu isi instaleaza si daemon-ul de ssh sunt multiple: neatentie, graba, necunoastere. Din pacate cam asta e ordinea în care se intampla lucrurile. Iata cum puteti instala foarte usor acest daemon ce va permite accesul de la distanta:

In Debian/Ubuntu:

[root@LinuxPedia ~]# sudo apt-get update
[root@LinuxPedia ~]# sudo apt-get install openssh-server openssh-client

In CentOS/Fedora:

[root@LinuxPedia ~]# yum install openssh-server openssh-clients

Si eu va sfatuiesc sa nu lasati port 22 default setat deoarece este vulnerabil la bruteforce scaning de modificat il modifcati in urmatorul mod :

[root@LinuxPedia ~]# nano /etc/ssh/sshd_config

Original arata asa :

[root@LinuxPedia ~]# cat /etc/ssh/sshd_config
#       $OpenBSD: sshd_config,v 1.73 2005/12/06 22:38:28 reyk Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options change a
# default value.

#Port 22
#Protocol 2,1
Protocol 2
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 768

# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
SyslogFacility AUTHPRIV
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6

#RSAAuthentication yes
#PubkeyAuthentication yes
#AuthorizedKeysFile     .ssh/authorized_keys

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
PasswordAuthentication yes

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
ChallengeResponseAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
GSSAPICleanupCredentials yes

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication mechanism.
# Depending on your PAM configuration, this may bypass the setting of
# PasswordAuthentication, PermitEmptyPasswords, and
# "PermitRootLogin without-password". If you just want the PAM account and
# session checks to run without PAM authentication, then enable this but set
# ChallengeResponseAuthentication=no
#UsePAM no
UsePAM yes

# Accept locale-related environment variables
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#ShowPatchLevel no
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
#PermitTunnel no

# no default banner path
#Banner /some/path

# override default of no subsystems
Subsystem       sftp    /usr/libexec/openssh/sftp-server
IgnoreRhosts yes
Banner /etc/motd2
IgnoreUserKnownHosts no
PrintMotd yes
StrictModes yes
RSAAuthentication yes
PermitRootLogin yes
PermitEmptyPasswords no
[root@LinuxPedia ~]#

Modificam in el linia :

#Port 22
cu
Port 2233

Voi veti modifica doar Port 22 cu Port 2288 si stergeti # din fata de la Port.
Dupa ce ati facut modificarea dati urmatoarele 2 comenzi !

[root@LinuxPedia ~]# /etc/init.d/sshd restart

Daca copiati acest tutorial sper sa puneti si un link de unde lati copiat.
Daca aveti nevoie de ajutor astept comment!