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Sep 06, 2014 ASA(config)# crypto key generate rsa modulus 1024 INFO: The name for the keys will be: Keypair generation process begin. Step 5: Now specify only particular hosts or network to connect to the device using SSH. May 20, 2014  Author, teacher, and talk show host Robert McMillen shows you how to use the Cisco ASA version 9 generate RSA keys command. May 20, 2014 Author, teacher, and talk show host Robert McMillen shows you how to use the Cisco ASA version 9 generate RSA keys command. Sep 06, 2014  Configure SSH Access in Cisco ASA. You can access Cisco ASA appliance using Command Line Interface (CLI) using either Telnet or SSH and for web-based graphical management using HTTPS (ASDM) management. Telnet uses TCP port 23 and is not secure. Secure Shell (SSH) on the other hand uses port 22 and is secure.

• October 2, 2015
• Posted by: Syed Shujaat
• Category: Cisco, Networking Solutions

Use this command to generate RSA key pairs for your Cisco device (such as a router). keys are generated in pairs–one public RSA key and one private RSA key.

If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys.

NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).

You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)

Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH

1 Setup Local VTY line User ID and password

router (Config) # Line VTY 0 15

router (Config-line)# login local

router (Config-line)# Exit

!!! create local login ID/Pass

router (Config)# username [loginid] password [cisco]

router (Config)# username loginid1 password cisco1

2. router (Config)# ip domain-name example.com

router (Config)# crypto key generate rsa

how many bits in the modulus [512] :1024

router (Config)# ip ssh version2

router (Config)# CTRL Z

This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.

Modulus Length

When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.

The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.

Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.

Syntax Description : Optional Strings to embed with SSH Crypto key

Contents

Introduction

This document describes troubleshooting procedures for the RSA Authentication Manager, which can be integrated with the Cisco Adaptive Security Appliance (ASA) and the Cisco Secure Access Control Server (ACS).

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The RSA Authentication Manager is a solution that provides the One Time Password (OTP) for authentication. That password is changed every 60 seconds and can be used only once. It supports both hardware and software tokens.

Prerequisites

Requirements

Cisco recommends that you have basic knowledge of these topics:

• Cisco ASA CLI configuration
• Cisco ACS configuration

Components Used

The information in this document is based on these software versions:

• Cisco ASA software, Version 8.4 and later
• Cisco Secure ACS, Version 5.3 and later

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Theory

The RSA server can be accessed with RADIUS or the proprietary RSA protocol: SDI. Both the ASA and the ACS can use both protocols (RADIUS, SDI) in order to access the RSA.

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Remember that the RSA can be integrated with the Cisco AnyConnect Secure Mobility Client when a software token is used. This document focuses solely on ASA and ACS integration. For more information about AnyConnect, refer to the Using SDI Authentication section of the Cisco AnyConnect Secure Mobility Client Administrator Guide, Release 3.1.

RSA via RADIUS

RADIUS has one big advantage over SDI. On the RSA, it is possible to assign specific profiles (called groups on ACS) to users. Those profiles have specific RADIUS attributes defined. After successful authentication, the RADIUS-Accept message returned from the RSA contains those attributes. Based on those attributes, the ACS makes additional decisions. The most common scenario is the decision to use ACS Group Mapping in order to map specific RADIUS-attributes, related to the profile on the RSA, to a specific group on the ACS. With this logic, it is possible to move the whole authorization process from the RSA to the ACS and still maintain granular logic, as on the RSA.

RSA via SDI

SDI has two main advantages over RADIUS. The first is that the whole session is encrypted. The second is the interesting options that the SDI agent provides: it is able to determine if the failure is created because authentication or authorization failed or because the user was not found.

This information is used by the ACS in action for identity. For example, it could continue for 'user not found' but reject for 'authentication failed.'

There is one more difference between RADIUS and SDI. When a Network Access Device like ASA uses SDI, the ACS performs only authentication. When it uses RADIUS, the ACS performs authentication, authorization, accounting (AAA). However, this is not a big difference. It is possible to configure SDI for authentication and RADIUS for accounting for the same sessions.

SDI Protocol

By default, SDI uses User Datagram Protocol (UDP) 5500. SDI uses a symmetric encryption key, similar to the RADIUS key, in order to encrypt sessions. That key is saved in a node secret file and is different for every SDI client. That file is deployed manually or automatically.

Note: ACS/ASA does not support manual deployment.

For the automatic deployment node, the secret file is downloaded automatically after the first successful authentication. The node secret is encrypted with a key derived from the user's passcode and other information. This creates some possible security issues, so the first authentication should be performed locally and use encrypted protocol (Secure Shell [SSH], not telnet) in order to ensure that the attacker cannot intercept and decrypt that file.

Configuration

Notes:
Use the Command Lookup Tool (registered customers only) in order to obtain more information on the commands used in this section.
The Output Interpreter Tool (registered customers only) supports certain show commands. Use the Output Interpreter Tool in order to view an analysis of show command output.
Refer to Important Information on Debug Commands before you use debug commands.

SDI on ACS

It is configured in Users and Identity Stores > External Identity Store > RSA Secure ID Token Servers.

The RSA has multiple replica servers, such as the secondary servers for the ACS. There is no need to put all the addresses there, just the sdconf.rec file provided by the RSA administrator. This file includes the IP address of the primary RSA server. After the first successful authentication node, the secret file is downloaded along with the IP addresses of all RSA replicas.

In order to differentiate 'user not found' from 'authentication failure,' choose settings in the Advanced tab:

It is also possible to change the default routing (load balancing) mechanisms between multiple RSA servers (primary and replicas). Change it with the sdopts.rec file provided by the RSA administrator. In ACS, it is uploaded in Users and Identity Stores > External Identity Store > RSA Secure ID Token Servers > ACS Instance Settings.

For cluster deployment, the configuration should be replicated. After the first successful authentication, each ACS node uses its own node secret downloaded from the primary RSA server. It is important to remember to configure the RSA for all the ACS nodes in the cluster.

SDI on ASA

The ASA does not allow upload of the sdconf.rec file. And, like the ACS, it allows for automatic deployment only. The ASA needs to be configured manually in order to point to the primary RSA server. A password is not needed. After the first successful authentication node, the secret file is installed (.sdi file on flash) and further authentication sessions are protected. Also the IP address of other RSA servers are downloaded.

Here is an example:

After successful authentication, the show aaa-server protocol sdi or show aaa-server <aaa-server-group> command shows all RSA servers (if there are more than one), while the show run command shows only the primary IP address:

Troubleshoot

This section provides information you can use in order to troubleshoot your configuration.

No Agent Configuration on RSA

In many cases after you install a new ASA or change the ASA IP address, it is easy to forget to make the same changes on the RSA. The Agent IP address on the RSA needs to be updated for all clients that access the RSA. Then, the new node secret is generated. The same applies to the ACS, especially to secondary nodes because they have different IP addresses and the RSA needs to trust them.

Corrupted Secret Node

Sometimes the secret node file on the ASA or the RSA becomes corrupted. Then, it is best to remove the agent configuration on the RSA and add it again. You also need to do the same process on the ASA/ACS - remove and add configuration again. Also, delete the .sdi file on the flash, so that in the next authentication, a new .sdi file is installed. Automatic node secret deployment should occur once this is complete.

Node in Suspended Mode

Sometimes one of the nodes is in suspended mode, which is caused by no response from that server:

In suspended mode, the ASA does not try to send any packets to that node; it needs to have an OK status for that. The failed server is put in active mode again after the dead timer. For more information, refer to the reactivation-mode command section in the Cisco ASA Series Command Reference, 9.1 guide.

In such scenarios, it is best to remove and add the AAA-server configuration for that group in order to trigger that server into active mode again.

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Account Locked

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After multiple retries, the RSA might lock out of the account. It is easily checked on the RSA with reports. On the ASA/ACS, reports only show 'failed authentication.'

Maximum Transition Unit (MTU) Issues and Fragmentation

SDI uses UDP as transport, not MTU path discovery. Also UDP traffic does not have the Don't Fragment (DF) bit set by default. Sometimes for larger packets, there might be fragmentation problems. It is easy to sniff traffic on the RSA (both the appliance and Virtual Machine [VM] use Windows and use Wireshark). Complete the same process on the ASA/ACS and compare. Also, test RADIUS or WebAuthentication on the RSA in order to compare it to SDI (in order to narrow down the problem).

Packets and Debugs for ACS

Because SDI payload is encrypted, the only way to troubleshoot the captures is to compare the size of the response. If it is smaller than 200 bytes, there might be a problem. A typical SDI exchange involves four packets, each of which is 550 bytes, but that might change with the RSA server version:

In case of problems, it is usually more than four packets exchanged and smaller sizes:

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Also, the ACS logs are quite clear. Here are typical SDI logs on the ACS:

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Related Information

Generate Rsa Key Pair Cisco Asa Pro

• RSA/SDI Server Support section of the Cisco ASA 5500 Series Configuration Guide using the CLI, 8.4 and 8.6
• RSA SecurID Server section of the User Guide for Cisco Secure Access Control System 5.4