Difference between revisions of "Use SSH to execute commands (public/private key login)"

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'''1)''' Create a key using ssh-keygen
 
'''1)''' Create a key using ssh-keygen
  
<pre>%ssh-keygen -t dsa</pre>
+
<pre>%ssh-keygen -t rsa</pre>
  
This creates a DSA key pair that is compatible with Mikrotik.
+
This creates an RSA key pair that is compatible with Mikrotik.
  
<pre>Generating public/private dsa key pair.
+
<pre>Generating public/private RSA key pair.
Enter file in which to save the key (/home/user/.ssh/id_dsa):
+
Enter file in which to save the key (/home/user/.ssh/id_rsa):
 
Enter passphrase (empty for no passphrase):
 
Enter passphrase (empty for no passphrase):
 
Enter same passphrase again:
 
Enter same passphrase again:
Your identification has been saved in /home/user/.ssh/id_dsa.
+
Your identification has been saved in /home/user/.ssh/id_rsa.
Your public key has been saved in /home/user/.ssh/id_dsa.pub.
+
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
 
The key fingerprint is:
 
The key fingerprint is:
 
f0:d0:xx:ee:07:xx:bb:a8:xx:9e:e1:fe:77:48:xx:xx user@vp6.example.com
 
f0:d0:xx:ee:07:xx:bb:a8:xx:9e:e1:fe:77:48:xx:xx user@vp6.example.com
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Password:
 
Password:
  
ftp> put id_dsa.pub
+
ftp> put id_rsa.pub
 
226 ASCII transfer complete
 
226 ASCII transfer complete
  
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'''3)''' Now from either Winbox or terminal mode you need to import the key.  An example using terminal mode is given.
 
'''3)''' Now from either Winbox or terminal mode you need to import the key.  An example using terminal mode is given.
  
<pre>[admin@mikrotik]> user ssh-keys import public-key-file=id_dsa.pub  
+
<pre>[admin@mikrotik]> user ssh-keys import public-key-file=id_rsa.pub  
 
user: admin-ssh
 
user: admin-ssh
 
</pre>
 
</pre>
Line 61: Line 61:
  
  
'''6)''' Upload private and public keys on the device, from which you wish to use ssh commands with DSA authentication
+
'''6)''' Upload private and public keys on the device, from which you wish to use ssh commands with RSA authentication
  
  
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For executing a simple command with ssh you have to enclose command with quotes to tell shell which characters belong to single shell command parameter. If you use double quotes then you have to escape all inside double quotes with backslash \.
 
For executing a simple command with ssh you have to enclose command with quotes to tell shell which characters belong to single shell command parameter. If you use double quotes then you have to escape all inside double quotes with backslash \.
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_dsa 10.20.1.1 ":put \"hello\""</pre>
+
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 ":put \"hello\""</pre>
  
 
Another special character which need escaping is single dollar sign $ because it's used for variable handling by shell like bash or sh.  
 
Another special character which need escaping is single dollar sign $ because it's used for variable handling by shell like bash or sh.  
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_dsa 10.20.1.1 ":for i from=1 to=10 do={:put \$i}"</pre>
+
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 ":for i from=1 to=10 do={:put \$i}"</pre>
  
 
All other special characters evaluated by shell have to be escaped.
 
All other special characters evaluated by shell have to be escaped.
Line 92: Line 92:
 
=Examples=
 
=Examples=
  
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_dsa 10.20.1.1 "/system gps monitor"
+
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/system gps monitor"
 
   date-and-time: mar/18/2006 08:30:39
 
   date-and-time: mar/18/2006 08:30:39
 
       longitude: "W 117 00' 00''"
 
       longitude: "W 117 00' 00''"
Line 100: Line 100:
 
           valid: yes</pre>
 
           valid: yes</pre>
  
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_dsa 10.20.1.1 "/routing bgp peer print status"
+
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/routing bgp peer print status"
 
Flags: X - disabled
 
Flags: X - disabled
 
  0  remote-address=xxx.xxx.129.196 remote-as=65333 multihop=yes
 
  0  remote-address=xxx.xxx.129.196 remote-as=65333 multihop=yes
Line 108: Line 108:
 
     uptime=1w1d10h54m55s prefix-count=68 refresh-capability=yes</pre>
 
     uptime=1w1d10h54m55s prefix-count=68 refresh-capability=yes</pre>
  
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_dsa 10.20.1.1 "/ip firewall connection print count-only"
+
<pre>%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/ip firewall connection print count-only"
 
66566
 
66566
 
</pre>
 
</pre>

Revision as of 07:40, 27 May 2020

Configuration

The following example uses DSA key pair, this will allow you to run scripts and login from a remote machine against RouterOS using Public/Private key authentication.

Host to RouterOS

Note: commands are run using FreeBSD - should be similar on other platforms.

1) Create a key using ssh-keygen

%ssh-keygen -t rsa

This creates an RSA key pair that is compatible with Mikrotik.

Generating public/private RSA key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/user/.ssh/id_rsa.
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
The key fingerprint is:
f0:d0:xx:ee:07:xx:bb:a8:xx:9e:e1:fe:77:48:xx:xx user@vp6.example.com
Icon-note.png

Note: Make sure to leave the passphrase blank if you are going to be using this key in automated scripts. You do not want to be prompted for a password. Just make sure you keep your private key private (enough said?)!


2) Upload the generated key (public) to the target device:

Example: Upload key via FTP

%ftp 10.20.1.1
Connected to 10.20.1.1.
220 mikrotik FTP server (MikroTik 2.9.16) ready
Name (10.20.1.1:user): admin
331 Password required for admin
Password:

ftp> put id_rsa.pub
226 ASCII transfer complete

ftp> exit


3) Now from either Winbox or terminal mode you need to import the key. An example using terminal mode is given.

[admin@mikrotik]> user ssh-keys import public-key-file=id_rsa.pub 
user: admin-ssh

The user field above determines which user account will be logged in when you pass the key. For security reasons you should never use the 'admin' account (you knew that right?). Create a separate user account.

Now that you've created a key pair and imported the public key into RouterOS you can start running commands from your remote machine.

Icon-note.png

Note: If you wish to be able to run ssh / ssh-exec commands from one RouterOS device to another, follow the additional steps below


RouterOS to RouterOS

4) Create a new group with policies:

/user group add name=remote policy=ssh,read,write

5) Create a new user and assign the previously created group:

 /user add name=remote group=remote password=Sup3rStr0ngPassw0rd


6) Upload private and public keys on the device, from which you wish to use ssh commands with RSA authentication


7) Import both keys for the user:

/user ssh-keys private import user=remote private-key-file=mykey public-key-file=mykey.pub passphrase=""


Now you should be able to authenticate from this device to any other device which has a user with the imported public key

Icon-note.png

Note: You can disable password login for users with SSH-KEY imported using "/ip ssh set always-allow-password-login=no"


Save a Host key

Since v6.45.1(stable) RouterOS allows user to save a ssh host key after devices reset. Use the following configuration line

/system reset-configuration keep-users=yes


Escaping shell special characters

For executing a simple command with ssh you have to enclose command with quotes to tell shell which characters belong to single shell command parameter. If you use double quotes then you have to escape all inside double quotes with backslash \.

%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 ":put \"hello\""

Another special character which need escaping is single dollar sign $ because it's used for variable handling by shell like bash or sh.

%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 ":for i from=1 to=10 do={:put \$i}"

All other special characters evaluated by shell have to be escaped.

Examples

%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/system gps monitor"
  date-and-time: mar/18/2006 08:30:39
      longitude: "W 117 00' 00''"
       latitude: "N 33 0' 00''"
       altitude: "200.199997m"
          speed: "0.185200 km/h"
          valid: yes
%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/routing bgp peer print status"
Flags: X - disabled
 0   remote-address=xxx.xxx.129.196 remote-as=65333 multihop=yes
     in-filter=cymru-in out-filter=cymru-out route-reflect=no hold-time=3m
     ttl=60 tcp-md5-key="" remote-id=xxx.xxx.129.196 remote-hold-time=3h
     used-hold-time=3m used-keepalive-time=1m state=established
     uptime=1w1d10h54m55s prefix-count=68 refresh-capability=yes
%ssh -l admin-ssh -i /home/user/.ssh/id_rsa 10.20.1.1 "/ip firewall connection print count-only"
66566

DSA deprecated

Since OpenSSH 7.0 version DSA public key algorithm is considered weak and is deprecated. To be able to use DSA it needs to be enabled explicitly. Put PubkeyAcceptedKeyTypes +ssh-dss to ~/.ssh/config file.

Also to be able to connect to older versions of RouterOS you may need to use additional ssh parameters -o KexAlgorithms=diffie-hellman-group14-sha1 -o HostKeyAlgorithms=+ssh-dss

Otherwise, use RSA.

See also