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Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
Chapter 4 Setting Up the Sensor
Configuring SSH
Caution When you use the ssh host-key ip-address command, the SSH server at the specified IP address is
contacted to obtain the required key over the network. The specified host must be accessible at the
moment the command is issued. If the host is unreachable, you must use the full form of the command,
ssh host-key ip-address rsa1-key [key-modulus-length public-exponent public-modulus], to confirm the
fingerprint of the key displayed to protect yourself from accepting the key of an attacker.
For SSHv2, use the ssh host-key ip-address rsa-key [key] command to add an entry to the known hosts
list.
The following options apply:
• ip address—Specifies the IP address to add to the system.
• rsa-key—Specifies the RSA (SSHv2) key details.
–
key—Specifies the Base64 encoded public key.
• rsa1-key—Specifies the RSA1 (SSHv1) key details:
–
key-modulus-length—Specifies an ASCCI decimal integer in the range[511, 2048].
–
public-exponent—Specifies an ASCII decimal integer in the range [3, 2^32].
–
public-modulus—Specifies an ASCII decimal integer, x, such that (2^(key-modulus-length-1))
< x < (2^(key-modulus-length)).
To add a host to the SSH known hosts list, follow these steps:
Step 1 Log in to the CLI using an account with administrator or operator privileges.
Step 2 Enter configuration mode.
sensor# configure terminal
Step 3 Add an entry to the known hosts list.
sensor(config)# ssh host-key 10.16.0.0
Bubble Babble is xucis-hehon-kizog-nedeg-zunom-kolyn-syzec-zasyk-symuf-rykum-sexyx
Would you like to add this to the known hosts table for this host?[yes]
The Bubble Babble appears. You are prompted to add it to the known hosts list.
If the host is not accessible when the command is issued, this message appears.
Error: getHostSshKey : socket connect failed [4,111]
Step 4 Enter yes to have the fingerprint added to the known hosts list.
Step 5 Verify that the host was added.
sensor(config)# exit
sensor# show ssh host-keys
10.89.146.110
Step 6 View the key for a specific IP address.
sensor# show ssh host-keys 10.16.0.0
1024 35
139306213541835240385332922253968814685684523520064131997839905113640120217816869696708721
704631322844292073851730565044879082670677554157937058485203995572114631296604552161309712
601068614812749969593513740598331393154884988302302182922353335152653860589163651944997842
874583627883277460138506084043415861927
Bubble Babble: xebiz-vykyk-fekuh-rukuh-cabaz-paret-gosym-serum-korus-fypop-huxyx
sensor#