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Using Microsoft Windows Certificate Authority (CA) Certificates on Cisco IOS

I couldn’t find a guide that combined all of the necessary steps together. This guide assumes you already have SSH/telnet/terminal access to your router and already have a functioning Windows Certificate Authority, I used 2K8R2 but I’m sure you could use 2K3, 2K3R2 or 2K8. Heads up, on older versions of IOS, “pki” needs to be interchanged to “ca”.

How to configure SSH on Cisco IOS. #crypto key generate rsa The name for the keys will be: R1.NETWORKLESSONS.LOCAL Choose the size of the key modulus in the range of 360 to 4096 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes. 2048% Generating 2048 bit RSA keys, keys will be non-exportable. I have issued the command crypto key generate rsa general-keys modulus 2048. What command can be used to verify they key is 2048? Find A Community. I have issued the command crypto key generate rsa general-keys modulus 2048. What command can be used to verify they key is 2048? Hi,I was trying to 2fa cisco duo, all the required settings. Now at command line you can fix this with a ‘Crypto Key Generate RSA Modulus 2048‘ command, but you can’t get to command line only ASDM. On older versions of the ASDM you could generate the keypair in the Identification Certificates section (well you still can but only if you are also generating a certificate request file).

1. Create a 2048 bit RSA key.

2. Create a trustpoint. A trustpoint represents a trusted CA.

/cisco-crypto-key-generate-rsa-general-keys-modulus-2048.html. 3. We need to create a CSR (Certificate Request) to give to the MS Certificate Server

https://ameblo.jp/percoterwest1975/entry-12632427765.html. 4. Go to your Microsoft CA’s web Certificate Services. You have to use the web services as opposed to using the MMC snap-ip. If you use the snap-in you’ll get a 0×80094801: Denied by Policy Module error because the certificate request does not contain a Certificate Template request attribute, aka it doesn’t know what kind of cert you want unless you go through the Web GUI.

Open your browser and go to https://yourserver/certsrv/certcarc.asp

Cisco Crypto Key Generate Rsa 2048 Download

Download your CA Certificate as a Base 64 certificate, and rename it to something to identify it as the root certificate.

5. Convert your CSR into an actual certificate

Head over to https://yourserver/certsrv/certrqxt.asp and paste your certificate request into the box, select “web server” from the certificate template list and press submit. When you get a result download the certificate as a base64 certificate.

6. Install the root certificate

7. Almost there, now time to install your router’s new certificate.

8. Test your Certificate

show crypto pki certificates

9. If nothing went wrong you should now have the certificate installed. You can change your hostname to match the new certificate, or change services to it. For example Cisco AnyConnect SSL VPN.

Thanks to http://bytesolutions.com/Support/Knowledgebase/KB_Viewer/ArticleId/21/Installing-GoDaddy-SSL-Certificates-on-a-Cisco-IOS-Router-using-CLI.aspx and https://robbiecrash.me/?p=242 for helping me find the information that I combined to make this happen. Thanks guys for posting your exploits!

Telnet versus SSH

Many people continue to use Telnet for sensitive applications or access to critical systems. Telnet is CLEARTEXT, so all the data, including the login id is visible is someone intercepts that session

Cisco Crypto Key Generate Rsa 2048 Code

Here’s what this looks like using Wireshark an Open Source Protocol Analyzer when we use the Follow TCP Stream feature in Wireshark.

Cisco Crypto Key Generate Rsa 2048 2017

The next characters are red (the character I typed) and blue (the characters echoed back)

You clearly see the User Verification Prompt.Here's the telnet trace file.

Cisco Crypto Key Gen Rsa

Below you can see me typing in my username;

In this screenshot below you can see me entering the commandenable and the the enable password.

How to Enable SSH Version 1 on Cisco

Before you can enable SSH you need to assign individual (or group) user IDs and passwords.

These are just login id's and are required regardless if you use Telnet or SSH.

To enable locally administered user IDs, use the following set of configuration commands. I would not suggest using the nopassword parameter.

Put your own data in the italized text.

Now when you telnet into the device you should see the Username prompt

Now that you have login id's created you can turn on SSH version 1.

To enable SSH, use the following set of configuration commands. I would not suggest using the nopassword parameter.

Put your own data in the italized text.

Now we'll try to capture the SSH login and as you can see the login data is no longer in clear text. Here's the SSH 1 trace file.

The moral of the story is not to use Cleartext logins if the device or application is sensitive.

Cisco Crypto Key Generate Rsa 2048 Free

To upgrade to even more secure SSH version 2, type in the following commands

Cisco Crypto Key Generate Rsa 2048 2017

the SSH version 2 trace files are here

In this write up I used;

• Wireshark Protocol Analyzer(free)

• Putty Telnet/SSH Client(free)

• Cisco Switch(not free)