Difference between revisions of "Manual:System/SSH client"

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{{Note | For security reasons, plain text password input is not allowed. To ensure safe execution of the command remotely, use SSH key authentication for users on both sides. <br/>  
 
{{Note | For security reasons, plain text password input is not allowed. To ensure safe execution of the command remotely, use SSH key authentication for users on both sides. <br/>  
How to configure it can be found in: https://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login)}}
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An example, how to configure DSA key pair authentication can be found in: https://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login)}}
  
 
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Revision as of 12:06, 18 April 2019

Overview

RouterOS provides SSH client that supports SSHv2 logins to SSH servers reachable from the router.

Requirements

For this command to be available router has to have system and security packages installed.

SSH

Sub-menu: /system ssh

Simple log-in to remote host

It is able to connect to remote host and initiate ssh session. IP address supports both IPv4 and IPv6.

/system ssh 192.168.88.1
/system ssh 2001:db8:add:1337::beef


In this case user name provided to remote host is one that has logged into the router. If other value is required, then user=<username> has to be used.

/system ssh 192.168.88.1 user=lala
/system ssh 2001:db8:add:1337::beef user=lala

Log-in from certain IP address of the router

For testing or security reasons it may be required to log-in to other host using certain source address of the connection. In this case src-address=<ip address> argument has to be used. Note that IP address in this case supports both, IPv4 and IPv6.


/system ssh 192.168.88.1 src-address=192.168.89.2
/system ssh 2001:db8:add:1337::beef src-address=2001:db8:bad:1000::2

in this case, ssh client will try to bind to address specified and then initiate ssh connection to remote host.

Log-in using certificate

For this to work user has to set up public key on remote end where ssh will connect to. How to do that on RouterOS you can read here. On local end router, public and private keys have to be uploaded to be used in /user ssh-keys private when adding private key and user name that will be able to use this key.

Icon-warn.png

Warning: User with full rights on the router can change 'user' attribute value under /user ssh-keys private



Here private key is created for use for user lala

/user ssh-keys private import private-key-file=id_dsa public-key-file=id_dsa.pub user=lala

Executing remote commands

To execute remote command it has to be supplied at the end of log-in line

/system ssh 192.168.88.1 "/ip address print"
/system ssh 192.168.88.1 command="/ip address print"
/system ssh 2001:db8:add:1337::beef "/ip address print"
/system ssh 2001:db8:add:1337::beef command="/ip address print"


Icon-warn.png

Warning: If the server does not support pseudo-tty (ssh -T or ssh host command), like mikrotik ssh server, then it is not possible to send multiline commands via SSH


For example, sending command "/ip address \n add address=1.1.1.1/24" to MikroTik router will fail.

Icon-note.png

Note: If you wish to execute remote commands via scripts or scheduler, use command ssh-exec.


SSH-exec

Sub-menu: /system ssh-exec

Command ssh-exec is a non-interactive ssh command, thus allowing to execute commands remotely on a device via scripts and scheduler.

Retrieve information

The command will return two values:

  • ) exit-code: returns 0 if the command execution succeeded
  • ) output: returns the output of remotely executed command


Example: Code below will retrieve interface status of ether1 from device 10.10.10.1 and output the result to "Log"

:local Status ([/system ssh-exec address=10.10.10.1 user=remote command=":put ([/interface ethernet monitor [find where name=ether1] once as-value]->\"status\")" as-value]->"output")
:log info $Status
Icon-note.png

Note: For security reasons, plain text password input is not allowed. To ensure safe execution of the command remotely, use SSH key authentication for users on both sides.
An example, how to configure DSA key pair authentication can be found in: https://wiki.mikrotik.com/wiki/Use_SSH_to_execute_commands_(DSA_key_login)


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See also