SSH - SSH client (OpenSsh)

> SSH (Secure Shell) - Remote Access

1 - About

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3 - Management

3.1 - Installation

3.2 - Configuration

  • user's private key location: ~/.ssh/id_rsa

3.2.1 - ssh-agent

ssh-agent is a background process where you can store keys (encrypted by a passphrase or not).

3.2.2 - ssh_config

  • User wide
touch ~/.ssh/config
chmod 600 ~/.ssh/config
vim ~/.ssh/config
  • System wide
/etc/ssh/ssh_config
# This is the ssh client system-wide configuration file.  See
# ssh_config(5) for more information.  This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.
 
# Configuration data is parsed as follows:
#  1. command line options
#  2. user-specific file
#  3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.
 
# Site-wide defaults for some commonly used options.  For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.
 
Host *
#   ForwardAgent no
#   ForwardX11 no
#   ForwardX11Trusted yes
#   RhostsRSAAuthentication no
#   RSAAuthentication yes
#   PasswordAuthentication yes
#   HostbasedAuthentication no
#   GSSAPIAuthentication no
#   GSSAPIDelegateCredentials no
#   GSSAPIKeyExchange no
#   GSSAPITrustDNS no
#   BatchMode no
#   CheckHostIP yes
#   AddressFamily any
#   ConnectTimeout 0
#   StrictHostKeyChecking ask
#   IdentityFile ~/.ssh/identity
#   IdentityFile ~/.ssh/id_rsa
#   IdentityFile ~/.ssh/id_dsa
#   IdentityFile ~/.ssh/id_ecdsa
#   IdentityFile ~/.ssh/id_ed25519
#   Port 22
#   Protocol 2
#   Cipher 3des
#   Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
#   MACs hmac-md5,hmac-sha1,[email protected],hmac-ripemd160
#   EscapeChar ~
#   Tunnel no
#   TunnelDevice any:any
#   PermitLocalCommand no
#   VisualHostKey no
#   ProxyCommand ssh -q -W %h:%p gateway.example.com
#   RekeyLimit 1G 1h
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIAuthentication yes
    GSSAPIDelegateCredentials no

3.3 - Executing a remote command

ssh user@host "command -arg1 'arg1value' -arg2 'arg2 value'"

Don't forget the quote to bypass the expansion mechanism

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3.4 - Debug

ssh -vvv hostname

3.5 - Logging with a private key

ssh -i private_key.pem user@hostname

where:

ssh/ssh.txt · Last modified: 2019/03/20 13:19 by gerardnico