Cisco Asa Generate Ssh Key Asdm
Generate an RSA key pair for the ASA Firewall, which is required for SSH: ASA(config)#crypto key generate rsa modulus modulussizeNote: The modulussize (in bits) can be 512, 768, 1024, or 2048. The larger the key modulus size you specify, the longer it takes to generate the RSA key pair. My question is will generating a crypto key using 'crypto key generate rsa mod 2048' using the cli option in asdm break anything as currently there is no crypto key. The ASAs do have VPNs configured. Because it is a live environment, I just want to ensure it will be as simple as running the command and getting ssh access to the firewalls.
Oct 16, 2019 Management Access. This chapter describes how to access the Cisco ASA for system management through Telnet, SSH, and HTTPS (using ASDM), how to authenticate and authorize users, and how to create login banners. This section describes how to configure ASA access for ASDM, Telnet, or SSH, and other management parameters such as a login banner.
This guide will walk you through the basics of hardening SSH access to your Cisco ASA firewall using ASDM. If you're like me, you'd rather have a GUI than spending the day Googling CLI commands.
4 Steps total
Step 1: Login to ASDM
Cisco Asa Ssh Access Denied
Step 2: Change the default allow SSH version from 1 to 2
Go to Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH
Under SSH Settings, change the value of 'Allowed SSH Version(s)' from 1 to 2.
Step 3: Change the default Diffie-Hellman group from 1 to 14
Remain in Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH
Under SSH Settings, change the radio toggle of 'DH Key Exchange' from Group 1 to Group 14.
Step 4: Lock down SSH access to the firewall
Remain in Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH
Under 'Specify the addresses of all hosts/networks which are allowed to access the ASA using ASDM/HTTPS/Telnet/SSH', you should add the static IPs of the devices or servers you wish to access the firewall from.
Click Add on the right.
Select the radio button next to SSH.
Select 'Inside' as the interface.
Enter the static IP of the device/server.
Enter 255.255.255.255 as the subnet mask.
Click OK.
Enable Asdm On Asa
Repeat for all remaining devices/servers or specify any outside IPs which are static that require remote access.
Cisco Asa Setup Ssh
WARNING: If your firewall has 0.0.0.0 'any' enabled by default, make sure you save your changes by adding your static IP first before deleting the 'any' entry. Otherwise, your session will disconnect.
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Generate and share ssh keys. Jun 22, 2012 SSH keys provide a more secure way of logging into a virtual private server with SSH than using a password alone. With SSH keys, users can log into a server without a password. This tutorial explains how to generate, use, and upload an SSH Key Pair.
You may repeat the last step for hardening access to ASDM as well.
3 Comments
- Sonoraalexthompson4 Oct 16, 2018 at 06:51pm
Thank you for the guide! For accessing the ASA through SSH, what devices would you recommend connecting from (a server, etc) from a security standpoint?
- Ghost Chilistarg33ker Oct 16, 2018 at 06:56pm
I only connect to the ASA from our Hyper-V host.
- Sonoraalexthompson4 Oct 16, 2018 at 07:02pm
That's a good idea! I shall have to work on implementing it at my workplace.