Paramiko SSH Key-Based Authentication Example: Cisco IOS using Specific Signature Algorithm SHA-RSA

#sshkey #ssh-algorithm #paramikosshkey
𝗙𝗼𝗿 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗣𝘆𝘁𝗵𝗼𝗻 𝗳𝗼𝗿 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹𝘀:
𝗘𝗻𝗿𝗼𝗹𝗹 𝗶𝗻 𝘁𝗵𝗲 𝗯𝗲𝗹𝗼𝘄 𝗨𝗱𝗲𝗺𝘆 𝗖𝗼𝘂𝗿𝘀𝗲: 𝟮𝟬𝟮𝟮 𝗩𝗲𝗿𝘀𝗶𝗼𝗻

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Our pubkey algorithm list: ['rsa-sha2-512', 'rsa-sha2-256', 'sha-rsa']
you may use disabled_algorithms
disabled_algorithms=dicts(pubkeys=['rsa-sha2-512', 'rsa-sha2-256'])
use specific private key file for ssh auth

import sys
import time
import traceback

from paramiko import client, ssh_exception, RSAKey
from getpass import getpass
import socket

username = 'admin2'
csr_cmd = ['config t', 'int lo1001', 'ip address 1.1.1.1 255.255.255.0', 'end']
def cisco_cmd_executor(hostname, commands):
try:
print(f"Connecting to the device {hostname}..")
ssh_client = client.SSHClient()
allow_agent=True,
pkey=key_file,
disabled_algorithms=dict(pubkeys=['rsa-sha2-512', 'rsa-sha2-256']))

print(f"Connected to the device {hostname}")

for cmd in commands:

except ssh_exception.NoValidConnectionsError:
print("SSH Port not reachable")
print("Check the hostname")
except ssh_exception.AuthenticationException:
print("Authentication failed, check credentials")

except:
print("Exception Occurred")

[NetworkEvolution]

𝑳𝒆𝒂𝒓𝒏 𝒕𝒐 𝑨𝒖𝒕𝒐𝒎𝒂𝒕𝒆 𝒚𝒐𝒖𝒓 𝑵𝒆𝒕𝒘𝒐𝒓𝒌 𝑰𝒏𝒇𝒓𝒂𝒔𝒕𝒓𝒖𝒄𝒕𝒖𝒓𝒆 𝒇𝒓𝒐𝒎 𝑺𝒄𝒓𝒂𝒕𝒄𝒉:
𝑵𝒆𝒕𝒎𝒊𝒌𝒐, 𝑷𝒂𝒓𝒂𝒎𝒊𝒌𝒐, 𝑺𝑺𝑯, 𝑵𝒐𝒓𝒏𝒊𝒓, 𝑷𝒚𝑨𝑻𝑺, 𝑵𝑨𝑷𝑨𝑳𝑴, 𝑵𝑬𝑻𝑪𝑶𝑵𝑭, 𝑹𝑬𝑺𝑻𝑪𝑶𝑵𝑭, 𝒀𝑨𝑵𝑮 𝑴𝒐𝒅𝒆𝒍, 𝑹𝑬𝑺𝑻-𝑨𝑷𝑰, 𝑵𝑿-𝑨𝑷𝑰 𝑨𝒖𝒕𝒐𝒎𝒂𝒕𝒊𝒐𝒏𝒔.

𝗙𝗼𝗿 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗣𝘆𝘁𝗵𝗼𝗻 𝗳𝗼𝗿 𝗡𝗲𝘁𝘄𝗼𝗿𝗸 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝘀 𝗧𝘂𝘁𝗼𝗿𝗶𝗮𝗹𝘀:
𝗘𝗻𝗿𝗼𝗹𝗹 𝗶𝗻 𝘁𝗵𝗲 𝗯𝗲𝗹𝗼𝘄 𝗨𝗱𝗲𝗺𝘆 𝗖𝗼𝘂𝗿𝘀𝗲:

Hi,
I use tacacs+ username instead of local username when connecting to switches.
What changes do I need to make in your code to be able to connect based on ssh-key?

switch config:
aaa authentication login default group tacacs+ local
aaa authorization exec default group tacacs+ local if-authenticated
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
aaa accounting connection default start-stop group tacacs+

Thanks