Cisco Pix 6.3 Generate Ssh Key
Contents
Introduction
- Nov 16, 2011 Here is the command line (CLI) Code: conf t http server enable http 10.10.10.10 255.255.255.255 inside Then connect to This will only work if the name inside is the name of the interface that we connect to this can be changed if needed.
- Oct 08, 2018 PIX command authorization and expansion of local authentication was introduced in version 6.2. This document provides an example of how to set this up on a PIX. Previously available authentication features are still available but not discussed in this document (for example, Secure Shell (SSH), IPsec client connection from a PC, and so on).
- Configuring PIX to Accept SSH Connections. Our first task is to generate an RSA public/private key pair to use to securely transfer the session key from the server to the client. The hostname and domain-name must be set before the PIX will allow you to generate the key pair. Assign a hostname and domain name to the PIX.
Generate the RSA keys You problaby already did this, but if you ever need to reissue the cert, regenerate the rsa keys, otherwise the CSR will be exactly the same and not accepted by the 3rd party CA. Crypto key generate rsa 2. Define the trustpoint crypto ca trustpoint thawte.com crl optional enrollment terminal.
PIX command authorization and expansion of local authentication was introduced in version 6.2. This document provides an example of how to set this up on a PIX. Previously available authentication features are still available but not discussed in this document (for example, Secure Shell (SSH), IPsec client connection from a PC, and so on). The commands performed may be controlled locally on the PIX or remotely through TACACS+. RADIUS command authorization is not supported; this is a limitation of the RADIUS protocol.
Local command authorization is done by assigning commands and users to privilege levels.
Remote command authorization is done through a TACACS+ authentication, authorization, and accounting (AAA) server. Multiple AAA servers can be defined in the event that one is unreachable.
Authentication also works with previously configured IPSec and SSH connections. SSH authentication requires that you issue this command:
Note: If you use a TACACS+ or RADIUS server group for authentication, you can configure the PIX to use the local database as a FALLBACK Method if the AAA server is unavailable.
For Example
You can alternatively use the local database as your main method of authentication (with no fallback) if you enter LOCAL alone.
For example, issue this command in order to define a user account in the local database and to perform local authentication for an SSH connection:
Refer to How To Perform Authentication and Enabling on the Cisco Secure PIX Firewall (5.2 Through 6.2) for more information on how to create AAA-authenticated access to a PIX Firewall that runs PIX Software version 5.2 through 6.2 and for more information about enable authentication, syslogging, and gaining access when the AAA server is down.
Refer to PIX/ASA : Cut-through Proxy for Network Access using TACACS+ and RADIUS Server Configuration Example for more information on how to create AAA-authenticated (Cut-through Proxy) access to a PIX Firewall that runs PIX Software versions 6.3 and later.
If the configuration is done properly, you should not be locked out of the PIX. If the configuration is not saved, rebooting the PIX should return it to its pre-configuration state. If the PIX is not accessible due to misconfiguration, refer to Password Recovery and AAA Configuration Recovery Procedure for PIX.
Before You Begin
Conventions
For more information on document conventions, see the Cisco Technical Tips Conventions.
Prerequisites
There are no specific prerequisites for this document.
Components Used
The information in this document is based on these software and hardware versions:
PIX Software version 6.2
Cisco Secure ACS for Windows version 3.0 (ACS)
Cisco Secure ACS for UNIX (CSUnix) version 2.3.6
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Testing Prior to Adding Authentication/Authorization
Prior to implementing the new 6.2 authentication/authorization features, make sure that you are currently able to gain access to the PIX using these commands:
Understanding Privilege Settings
Most commands in the PIX are at level 15, although a few are at level 0. To view current settings for all commands, use this command:
Most commands are at level 15 by default, as shown in this example:
A few commands are at level 0, as shown in this example:
The PIX can operate in enable and configure modes. Some commands, such as show logging, are available in both modes. To set privileges on these commands, you must specify the mode that the command exists in, as shown in the example. The other mode option is enable. You get the logging is a command available in multiple modes error message. If you do not configure the mode, use the mode [enable configure] command:
These examples address the clock command. Use this command to determine the current settings for the clock command:
The output of the show privilege command clock command shows that the clock command exists in these three formats:
Authentication/Authorization - Local Usernames
Before changing the privilege level of the clock command, you should go to the console port to configure an administrative user and turn on LOCAL login authentication, as shown in this example:
The PIX confirms the addition of the user, as shown in this example:
The user 'poweruser' should be able to Telnet into the PIX and enable with the existing local PIX enable password (the one from the enable password <password> command).
You can add more security by adding authentication for enabling, as shown in this example:
This requires the user to enter the password both for login and enable. In this example, the password 'poweruser' is used for both login and enable. User 'poweruser' should be able to Telnet into the PIX and also enable with the local PIX password.
If you want some users to be able to only use certain commands, you have to set up a user with lower privileges, as shown in this example:
Since practically all of your commands are at level 15 by default, you have to move some commands down to level 9 so that 'ordinary' users can issue them. In this instance, you want your level 9 user to be able to use the show clock command, but not to reconfigure the clock, as shown in this example:
You also need your user to be able to log out of the PIX (the user might be in level 1 or 9 when wanting to do this), as shown in this example:
You need the user to be able to use the enable command (the user is at in level 1 when attempting this), as shown in this example:
By moving the disable command to level 1, any user between levels 2-15 can get out of enable mode, as shown in this example:
If you Telnet in as the user 'ordinary' and enable as the same user (the password is also 'ordinary'), you should use the privilege configure level 1 command disable, as shown in this example:
If you still have the original session open (the one prior to adding any authentication), the PIX may not know who you are because you did not initially log in with a username. If that is the case, use the debug command to view messages about the user 'enable_15' or 'enable_1' if there is no associated username. Therefore, Telnet into the PIX as the user 'poweruser' (the 'level 15' user) prior to configuring command authorization, because you need to be sure the PIX can associate a username with the commands being attempted. You are ready to test command authorization by using this command:
The user 'poweruser' should be able to Telnet in, enable, and perform all commands. The user 'ordinary' should be able to use the show clock, enable, disable, and logout commands but no others, as shown in this example:
Authentication/Authorization with an AAA Server
You can also authenticate and authorize users by using an AAA server. TACACS+ works best because command authorization is possible, but RADIUS can also be used. Check to see if there are previous AAA Telnet/console commands on the PIX (in the event that the LOCAL AAA command was previously used), as shown in this example:
If there are previous AAA Telnet/console commands, remove them by using these commands:
As with configuring local authentication, test to make sure users can Telnet into the PIX by using these commands.
Depending on what server you are using, configure the PIX for authentication/authorization with an AAA server.
ACS - TACACS+
Configure ACS to communicate with the PIX by defining the PIX in the Network Configuration with 'Authenticate Using' TACACS+ (for Cisco IOS® Software). The configuration of the ACS user depends on the configuration of the PIX. At a minimum, the ACS user should be set up with a username and password.
On the PIX, use these commands:
At this point, the ACS user should be able to Telnet into the PIX, enable it with the existing enable password on the PIX, and perform all commands. Fifa 18 beta key generator. Complete these steps:
If there is a need to do PIX enable authentication with ACS, choose Interface Configuration > Advanced TACACS+ Settings.
Check the Advanced TACACS+ Features in Advanced Configuration Options box.
Click Submit. The Advanced TACACS+ Settings are now visible under the user configuration.
Set Max Privilege for any AAA Client to Level 15.
Choose the enable password scheme for the user (which could involve configuring a separate enable password).
Click Submit.
To turn on enable authentication through TACACS+ in the PIX, use this command:
At this point, the ACS user should be able to Telnet into the PIX and enable with the enable password configured in ACS.
Prior to adding PIX command authorization, ACS 3.0 must be patched. You can download the patch from the Software Center (registered customers only) . You can also view additional information about this patch by accessing Cisco bug ID CSCdw78255 (registered customers only) .
Authentication must be working prior to doing command authorization. Faststone photo resizer download mac. If there is a need to perform command authorization with ACS, choose Interface Configuration > TACACS+ (Cisco) > Shell (exec) for user and/or group and click Submit. The shell command authorization settings are now visible under the user (or group) configuration.
It is a good idea to set up at least one powerful ACS user for command authorization and to permit unmatched Cisco IOS commands.
Other ACS users can be set up with command authorization by permitting a subset of commands. This example uses these steps:
Choose Group Settings to find the desired group from the drop-down box.
Click Edit Settings.
Choose Shell Command Authorization Set.
Click the Command button.
Enter login.
Choose Permit under Unlisted Arguments.
Repeat this process for the logout, enable, and disable commands.
Choose Shell Command Authorization Set.
Click the Command button.
Entershow.
Under Arguments , enter permit clock.
Choose deny for Unlisted Arguments.
Click Submit.
Here is an example of these steps:
If you still have your original session open (the one prior to adding any authentication), the PIX may not know who you are because you did not initially log in with a ACS username. If that is the case, use the debug command to view messages about user 'enable_15' or 'enable_1' if there is no username associated. You need to be sure the PIX can associate a username with the commands being attempted. You can do this by Telnetting into the PIX as the level 15 ACS user prior to configuring command authorization. You are ready to test command authorization by using this command:
At this point, you should have one user who should be able to Telnet in, enable, and use all of the commands, and a second user who can only do five commands.
CSUnix - TACACS+
Configure CSUnix to communicate with the PIX as you would with any other network device. The configuration of the CSUnix user depends on the configuration of the PIX. At a minimum, the CSUnix user should be set up with a username and password. In this example, three users have been set up:
On the PIX, use these commands:
At this point, any of the CSUnix users should be able to Telnet into the PIX, enable with the existing enable password on the PIX, and use all of the commands.
Enable authentication through TACACS+ in the PIX:
At this point, the CSUnix users who have 'privilege 15' passwords should be able to Telnet into the PIX and enable with those 'enable' passwords.
If you still have your original session open (the one prior to adding any authentication), the PIX may not know who you are because you did not initially log in with a username. If that is the case, issuing the debug command may show messages about user 'enable_15' or 'enable_1' if there is no username associated. Telnet into the PIX as the user 'pixtest' (our 'level 15' user) prior to configuring command authorization, because we need to be sure the PIX can associate a username with the commands being attempted. Enable authentication must be on prior to doing command authorization. If there is a need to perform command authorization with CSUnix, add this command:
Of the three users, 'pixtest' can do everything, and the other two users can do a subset of commands.
ACS - RADIUS
RADIUS command authorization is not supported. Telnet and enable authentication is possible with ACS. ACS can be configured to communicate with the PIX by defining the PIX in Network Configuration with 'Authenticate Using' RADIUS (any variety). The configuration of the ACS user depends on the configuration of the PIX. At a minimum, the ACS user should be set up with a username and password.
On the PIX, use these commands:
At this point, the ACS user should be able to Telnet into the PIX, enable with the existing enable password on the PIX, and use all commands (the PIX does not send commands to the RADIUS server; RADIUS command authorization is not supported).
If you want to enable with ACS and RADIUS on the PIX, add this command:
Unlike with TACACS+, the same password is used for RADIUS enable as for RADIUS login.
CSUnix - RADIUS
Configure CSUnix to talk to the PIX as you would with any other network device. The configuration of the CSUnix user depends on the configuration of the PIX. This profile works for authentication and enabling:
On the PIX, use these commands:
If you want to enable with ACS and RADIUS on the PIX, use this command:
Unlike with TACACS+, the same password is used for RADIUS enable as for RADIUS login.
Network Access Restrictions
Network access restrictions can be used in both ACS and CSUnix to limit who may connect to the PIX for administrative purposes.
Generate Ssh Key Windows
ACS—The PIX would be configured in the Network Access Restrictions area of the Group Settings. The PIX configuration is either 'Denied Calling/Point of Access Locations' or 'Permitted Calling/Point of Access Locations' (depending on the security plan).
CSUnix—This is an example of a user who is permitted access to the PIX, but not other devices:
Debug
To turn on debug, use this command:
These are examples of good and bad debugs:
Good debug—The user is able to use the log in, enable, and perform commands.
Bad debug—Authorization fails for user, as shown in this example:
The remote AAA server is unreachable:
Accounting
There is no actual command accounting available, but by having syslog activated on the PIX, you can see what actions were performed, as shown in this example:
Information to Collect if You Open a TAC Case
Cisco Pix 6.3 Generate Ssh Key Mac
| If you still need assistance after following the troubleshooting steps above and want to open a case with the Cisco TAC, be sure to include the following information for troubleshooting your PIX Firewall. |
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